CN116111992B

CN116111992B - Switching circuit and switching device

Info

Publication number: CN116111992B
Application number: CN202211724620.0A
Authority: CN
Inventors: 李怀民; 李睿; 蒋倩; 晏显栋; 沙祥彪; 吴世甲; 吕厚登
Original assignee: Zhongke Controllable Information Industry Co Ltd
Current assignee: Zhongke Controllable Information Industry Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2024-07-23
Anticipated expiration: 2042-12-30
Also published as: CN116111992A

Abstract

The present application relates to a switching circuit and a switching device. The switching circuit includes: the control circuit is connected with the switch signal output circuit and comprises a target switch and a self-locking circuit; the target switch is pressed and released under the condition that the switch signal output circuit outputs a shutdown control signal and then returns to an original state, and after the target switch returns to the original state, the self-locking circuit enters a self-locking conducting state to control the switch signal output circuit to continuously output a startup control signal, the target switch is pressed and released under the condition that the switch signal output circuit outputs the startup control signal and then returns to the original state, and after the target switch returns to the original state, the self-locking circuit enters an off state to control the switch signal output circuit to continuously output the shutdown control signal. The application can improve the flexibility of controlling the output switch control signal.

Description

Switching circuit and switching device

Technical Field

The present application relates to the field of server control technologies, and in particular, to a switching circuit and a switching device.

Background

The rapid development of intelligent information makes network information data explosive growth, wherein a blade server is used as an ultra-high computation density server integrating high performance, high density and high reliability into a whole, and is widely applied to the fields of high-density computation, web infrastructure, virtualization and the like. The blade server has more and more complicated application scenes, and the power supply requirement is higher and higher, and the current power supply scheme is that the blade is inserted into the tool box and then contacts with the power supply bus, and working voltage is provided for the main board of the server through the hot plug circuit and the power supply sub-card, wherein the switch control signals of the blade server are two, the first stage is the switch control signal PWR_EN of the hot plug circuit and the power supply sub-card, and the second stage is the switch control signal PWR_S5_S0 of the main board of the server.

In the conventional technology, the control of the switch control signal pwr_en of the power sub-card is completed by touching the switch key, pressing the switch key, sending the pwr_en low level, turning on the power sub-card, pressing the switch key again and rebounding, sending the pwr_en high level, and turning off the power sub-card.

However, when the switch control signal of the power sub-card is controlled by adopting the mode of touching the switch key, after the blade is abnormally powered down and is restarted, or the blade is inserted into the blade box under the condition that the switch key is missed and is not rebounded, the blade server is started under load, voltage disturbance is generated on a power supply bus, overcurrent pressure is caused on a hot plug circuit, and under-voltage overvoltage protection is generated by burning out the hot plug strip circuit or an adjacent blade when serious. And when inserting the blade to the case in batches, it is necessary to check whether the switch key rebounds one by one. Therefore, the manner of outputting the switch control signal by the switch key in the conventional technology has the problem of low flexibility.

Disclosure of Invention

In view of the above, it is desirable to provide a switching circuit and a switching device capable of improving the flexibility of controlling the output of a switching control signal.

In a first aspect, the present application provides a switching circuit. The switching circuit includes: the switching signal output circuit is used for sending a switching control signal to the controlled equipment, wherein the switching control signal comprises a shutdown control signal and a startup control signal; the control circuit is connected with the switch signal output circuit and comprises a target switch and a self-locking circuit; the target switch is pressed and released under the condition that the switch signal output circuit outputs a shutdown control signal and then returns to an original state, and after the target switch returns to the original state, the self-locking circuit enters a self-locking conducting state to control the switch signal output circuit to continuously output a startup control signal, the target switch is pressed and released under the condition that the switch signal output circuit outputs the startup control signal and then returns to the original state, and after the target switch returns to the original state, the self-locking circuit enters an off state to control the switch signal output circuit to continuously output the shutdown control signal.

In one embodiment, the switching circuit further comprises a power interface for connecting with an external power source; one end of the switching signal output circuit is connected with the power interface, the other end of the switching signal output circuit is grounded, the switching signal output circuit comprises a first switching tube and a signal output port which are connected with each other, and different on-off states of the first switching tube correspond to the signal output port to output different types of switching control signals; the control circuit is connected with the grid electrode of the first switching tube so as to control the on-off of the first switching tube.

In one embodiment, the control circuit includes a first control circuit and a second control circuit; one end of the first control circuit and one end of the second control circuit are connected with the power interface, and the other end of the first control circuit and the other end of the second control circuit are connected with the grid electrode of the first switching tube; the second control circuit comprises a target switch and a self-locking circuit, wherein the target switch is a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected with the grid electrode of the first switch tube, the first movable end of the single-pole double-throw switch is connected with the power interface, the second movable end of the single-pole double-throw switch is connected with one end of the self-locking circuit, and the other end of the self-locking circuit is connected with the power interface.

In one embodiment, the target switch further comprises a rear bin switch tube, a first pole of the rear bin switch tube is connected with a first movable end of the single-pole double-throw switch, a second pole of the rear bin switch tube is connected with a fixed end of the single-pole double-throw switch, and a grid electrode of the rear bin switch tube is connected with the rear bin control circuit.

The mode of inputting the rear bin signal to the rear bin switching tube to control the output of the on-off control signal can realize remote batch operation control of the on-off of the controlled equipment. And the batch power-on and AC (ALTERNATING CURRENT ) power-off test requirements are realized by inputting a rear bin signal into the rear bin switch tube.

In one embodiment, a grounding point is arranged between two ends of the first control circuit, the grounding point is grounded through a second switch, and a grid electrode of the second switch tube is connected with the power interface through a first capacitor.

In one embodiment, one end of the first capacitor connected with the gate of the second switching tube is connected with the first pole of the first switching tube, wherein the first pole of the first switching tube is connected with the power interface.

In one embodiment, the self-locking circuit comprises: the optical coupler switch comprises two input ports and two output ports, wherein the two input ports are connected with the power interface, and a first output port in the two output ports is connected with a second movable end of the single-pole double-throw switch; the first pole of the third switching tube is connected with the second output port of the two output ports and is connected with the first movable end of the single-pole double-throw switch, the second pole of the third switching tube is grounded, and the grid electrode of the third switching tube is connected with the second movable end of the single-pole double-throw switch; and the second capacitor is respectively connected with the second pole of the third switching tube and the grid electrode of the third switching tube.

The switch signal output circuit still can maintain to output a shutdown control signal or a startup control signal under the condition that the target switch is restored to the original state after being pressed and loosened by the self-locking circuit, so that when the blade is abnormally powered down and restarted, the target switch is still in the original state, the situation that the blade server is started in a loading way, voltage disturbance is generated on a power supply bus, overcurrent pressure is caused on the hot plug circuit, under-voltage overvoltage protection is generated when the hot plug strip circuit or an adjacent blade is burnt out seriously is avoided, and the condition that the original state is restored after the target switch is pressed and loosened each time does not exist because the condition that the switch keys are not rebounded to insert the blade into the cutter box in the prior art, and whether the switch keys rebounded or not need to be detected one by one when the blade is inserted into the cutter box in batches is avoided. Therefore, the present embodiment can achieve the object of improving the flexibility of controlling the output switch control signal.

In one embodiment, the switching circuit further includes a third capacitor, one end of the third capacitor is connected to the gate of the first switching tube, and the other end of the third capacitor is grounded.

In a second aspect, the present application also provides a switching device. The switching device comprises a switching circuit according to any one of the first aspects and a power supply sub-card, wherein the power supply sub-card is connected to the switching circuit as a controlled device.

In one embodiment, the switching device further comprises: a power supply bus; the first end of the hot plug circuit is connected with the power supply bus, and the second end of the hot plug circuit is connected with the first end of the power supply sub-card; the server main board is connected with the second end of the power daughter card; and the first end of the isolation transformer circuit is connected with the power supply bus, and the second end of the isolation transformer circuit is connected with the server main board.

In one embodiment, a power interface in the switching circuit is connected to the isolation transformer circuit.

In the above-described switching circuit and switching device, the switching circuit includes: the switching signal output circuit is used for sending a switching control signal to the controlled equipment, and the switching control signal comprises a shutdown control signal and a startup control signal; the control circuit is connected with the switch signal output circuit and comprises a target switch and a self-locking circuit; the target switch is pressed and released under the condition that the switch signal output circuit outputs a shutdown control signal and then returns to an original state, and after the target switch returns to the original state, the self-locking circuit enters a self-locking conducting state to control the switch signal output circuit to continuously output a startup control signal, the target switch is pressed and released under the condition that the switch signal output circuit outputs the startup control signal and then returns to the original state, and after the target switch returns to the original state, the self-locking circuit enters an off state to control the switch signal output circuit to continuously output the shutdown control signal. According to the application, after the target switch is pressed and released through the self-locking circuit, the switch signal output circuit still can maintain to output a shutdown control signal or a startup control signal under the condition that the target switch is restored to the original state, so that when the blade is abnormally powered down and restarted, the target switch is still in the original state, the situation that voltage disturbance is generated on a power supply bus and overcurrent pressure is caused on a hot plug circuit and under-voltage overvoltage protection is caused by burning the hot plug strip circuit or an adjacent blade when the power supply bus is seriously caused by the load start of the blade server is avoided, and the situation that the original state is restored after the target switch is pressed and released each time is avoided, the situation that the switch key is not rebounded to insert the blade into the cutter box in the prior art is avoided, and whether the switch key rebounds or not is detected one by one when the blade is inserted into the cutter box in batches is avoided. Therefore, the application can achieve the purpose of improving the flexibility of controlling the output switch control signal.

Drawings

FIG. 1 is a block diagram of a switching circuit in one embodiment;

FIG. 2 is a block diagram of a switching signal output circuit in one embodiment;

FIG. 3 is a block diagram of a control circuit in one embodiment;

FIG. 4 is a block diagram of a destination switch in one embodiment;

FIG. 5 is a block diagram of a self-locking circuit in one embodiment;

FIG. 6 is a block diagram of another switching circuit in one embodiment;

FIG. 7 is a block diagram of the state of a switching circuit when not targeted in one embodiment;

FIG. 8 is a block diagram of the state of the switching circuit when the target switch is not released by being pressed … in one embodiment;

FIG. 9 is a block diagram of the state of the switching circuit when the push target switch is released in one embodiment;

FIG. 10 is a block diagram of the state of the switching circuit when the target switch is not released by being pressed again in one embodiment;

FIG. 11 is a block diagram of the state of the switching circuit when the target switch is again pressed to release in one embodiment;

FIG. 12 is a block diagram of the state of a switching circuit at power down in one embodiment;

Fig. 13 is a block diagram of a switching device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The blade server is used as an ultra-high computation density server integrating high performance, high density and high reliability, the requirements of various and dynamic changes of the current data terminal business are met by high-density computation, web infrastructure and virtualization as main application targets, and along with the increase of the ultra-strong computation power requirements, application scenes of different chip sets such as a CPU (Central Processing Unit, a central processing unit), a GPU (Graphics Processing Unit, a graphic processor) and the like of the server are more and more complex and various, so that the power supply consumption is increased along with the increase of the power supply consumption, and the difficulty is also promoted in the test of the power supply of the blade server. And if the high-power supply is directly connected with the blade server, the instantaneous current generated when the blade is inserted into the blade box is overlarge, and the risk that the blade server is burnt exists, so that the instantaneous current generated when the blade is inserted into the blade box needs to be controlled.

At present, after a blade is inserted into a tool box, the blade is contacted with a power supply bus, working voltage is provided for a server main board through a hot plug circuit and a power supply sub-card, an isolation voltage transformation circuit is connected with the power supply bus and the server main board, starting voltage is provided for the server main board, wherein the switch control signals of the blade server are divided into two parts, the first stage is the switch control signals PWR_EN of the hot plug circuit and the power supply sub-card, the low level of the PWR_EN is the start control signals of the hot plug circuit and the power supply sub-card, and the high level of the PWR_EN is the shutdown signals of the hot plug circuit and the power supply sub-card. The second stage is that the switch control signals pwr_s5_s0, S0 and S5 of the server motherboard are two states of the server motherboard, namely a power-on state and a power-on non-power-on state, respectively, when the power daughter card is turned on, the server motherboard enters the S5 state, and when the server motherboard receives the power-on control signal pwr_s5_s0, the server motherboard enters the S0 state, so that the blade server enters the power-on state.

For the switch control signal pwr_en of the power daughter card, there are two current control methods: the first is simply accomplished by touching a switch button, which is a mechanical button to be returned, pressing the switch button, sending pwr_en low level, turning on the power daughter card, then pressing the switch button and rebounding, sending pwr_en high level, and turning off the power daughter card. The second is accomplished by touching the switch key, which is a touch key, with CPLD detecting rising edge or rising level as the power-on control signal, and CPLD (Complex Programmable Logic Device ) control, and power-on state detecting, rising edge or rising level time as the power-off control signal.

However, the control method has the following problems: (1) When the switch key is touched, the operation standard is strictly adhered to, and when the blade is inserted into the tool box every time, whether the switch key is in a rebound state or not needs to be carefully checked, and the working efficiency is affected during batch operation. (2) When the touch switch key is adopted, after batch power failure or abnormal power failure of the blade is performed, the blade is inserted into the cutter box or the missing switch key is not rebounded, so that the blade server is started in a loaded manner, voltage disturbance is generated on a power supply bus, overcurrent pressure is caused on a hot plug circuit, and under-voltage overvoltage protection is generated by burning out the hot plug circuit or an adjacent blade in severe cases. (3) When the touch switch key and the CPLD are adopted, as the CPLD needs a power supply, an isolation transformer circuit or a rear bin of a blade server is generally connected, but the power supply of the isolation transformer circuit and the rear bin can be increased no matter the isolation transformer circuit or the rear bin is connected, the CPLD has higher cost, and meanwhile, the CPLD can generate program run-off probability, so that the reliability of controlling and outputting a power on-off control signal is lower. Therefore, the conventional method for controlling the output of the switch control signal has problems of low flexibility, high cost, poor reliability, and the like, and therefore, effective means for solving the problems are required.

In one embodiment, as shown in fig. 1, there is provided a block diagram of a switching circuit including: the control circuit 200 comprises a target switch S and a self-locking circuit 201, wherein the switch signal output circuit 100 is used for sending a switch control signal to the controlled device 300, and the switch control signal comprises a shutdown control signal and a startup control signal; the control circuit 200 is connected to the switching signal output circuit 100; the self-locking circuit 201 enters a self-locking on state after the target switch S is restored to the original state, so as to control the switch signal output circuit 100 to continuously output a power-on control signal, the target switch S is restored to the original state after the switch signal output circuit 100 is pushed and released, and the self-locking circuit 201 enters an off state after the target switch S is restored to the original state, so as to control the switch signal output circuit to continuously output the power-off control signal.

The controlled device 300 may be a power daughter card or a hot plug circuit. The target switch is a single pole double throw switch.

Optionally, the second active end b of the target switch S is connected to the first end of the self-locking circuit 201, the first active end c of the target switch S is connected to the second end of the self-locking circuit 201 and to the first end of the switching signal output circuit 100, the fixed end a of the target switch S is connected to the second end of the self-locking circuit 201, and the third end of the switching signal output circuit 100 is connected to the controlled device 300.

When the blade is inserted into the tool box and the target switch S is not pressed, the target switch S is in an original state, i.e., the target switch S is communicated with the self-locking circuit 201, the self-locking circuit is in an off state, and the switch signal output circuit 100 outputs the pwr_en high level to the controlled device 300, i.e., outputs the shutdown control signal, so that the controlled device 300 is in a shutdown state.

When the target switch S is pressed but not released, at this time, the target switch S is connected to the switching signal output circuit 100 and disconnected from the self-locking circuit 201, and the switching signal output circuit 100 outputs the pwr_en low level to the controlled device 300, that is, outputs the power-on control signal, so that the controlled device 300 is in a power-on state.

When the switch is released, at this time, the target switch S is restored to the original state, that is, the target switch S is communicated with the self-locking circuit 201, and the self-locking circuit 201 enters the self-locking conducting state, so that the switch signal output circuit 100 continues to maintain the output pwr_en low level, thereby enabling the controlled device 300 to be in the on state.

When the target switch S is pressed again and not released, the target switch S is connected to the switch signal output circuit 100 and disconnected from the latch circuit 201, the latch circuit 201 is still in a latch on state, and the switch signal output circuit 100 outputs the pwr_en high level to the controlled device 300, so that the controlled device 300 is in a shutdown state.

When the hand is released again, at this time, the target switch S is restored to the original state, that is, the target switch S is communicated with the self-locking circuit 201, the self-locking circuit 201 enters the off state, and the switching signal output circuit 100 outputs the pwr_en high level to the controlled apparatus 300, thereby putting the controlled apparatus 300 in the off state. The state of the switching circuit at this time is the same as the state of the switching circuit when the blade is inserted into the blade case and the target switch S is not pressed.

In summary, the switching circuit includes: a switching signal output circuit 100 and a control circuit 200, wherein the switching signal output circuit 100 is configured to send a switching control signal to the controlled device 300, the switching control signal including a shutdown control signal and a startup control signal; the control circuit 200 is connected with the switch signal output circuit 100, and the control circuit 200 comprises a target switch S and a self-locking circuit 201; the self-locking circuit 201 enters a self-locking on state after the target switch S is restored to the original state, so as to control the switch signal output circuit 100 to continuously output the power-on control signal, the target switch S is restored to the original state after the switch signal output circuit 100 is pushed and released, and the self-locking circuit 201 enters an off state after the target switch S is restored to the original state, so as to control the switch signal output circuit 100 to continuously output the power-off control signal. According to the application, after the target switch SW1 is pressed and released through the self-locking circuit 201, under the condition that the switch signal output circuit 100 still can maintain to output a shutdown control signal or a startup control signal, so that when the blade is abnormally powered down and restarted, the target switch S is still in the original state, the situation that voltage disturbance is generated on a power supply bus and overcurrent pressure is caused to a hot plug circuit due to the loaded start of the blade server, under-voltage overvoltage protection is generated due to the fact that the hot plug strip circuit or an adjacent blade is burnt out when serious, and the condition that the original state is restored after the target switch S is pressed and released each time is avoided, the condition that a switch key is not rebounded in the prior art to insert the blade into the tool box is avoided, and whether the switch key rebounds or not is rebounded is checked one by one when the blade is inserted into the tool box in batches is not needed. Therefore, the application can achieve the purpose of improving the flexibility of controlling the output switch control signal.

In one embodiment, as shown in fig. 2, there is provided a block diagram of a switching signal output circuit, the switching circuit further including a power interface 400, the power interface 400 being for connection with an external power supply 500; one end of the switching signal output circuit 100 is connected with the power interface 400, the other end is grounded, the switching signal output circuit 100 comprises a first switching tube Q1 and a signal output port P which are connected with each other, and different on-off states of the first switching tube Q1 correspond to the signal output port P to output different types of switching control signals; the control circuit 200 is connected to the gate of the first switching tube Q1 to control the on/off of the first switching tube Q1.

The external power supply 500 may be an isolation transformer circuit or a back-bin of the blade server. The power up sequence of the power interface 400 is earlier than the power up sequence of the power bus to power the power daughter card and the hot plug, and the voltage at the power interface 400 may be 3.3V. The first switching tube Q1 may be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistor, specifically an N-type MOS transistor with a parasitic diode. The working principle of the N-type MOS tube with the parasitic diode is that when the voltage applied to the grid electrode is more than or equal to the threshold voltage, the drain electrode is conducted to the source electrode, and current passes through, wherein the threshold voltage is generally 0.7V.

Optionally, the switching signal output circuit 100 includes a first resistor R1, a first switching tube Q1, and a signal output port P. The power interface 400 is connected with the external power supply 500, the first pole of the first switching tube Q1 is connected with the power interface 400 through the first resistor R1, the second pole of the first switching tube Q1 is grounded, the signal output port P is arranged between the first resistor R1 and the first pole of the first switching tube Q1 and is connected with the controlled device 300, and the first pole and the second pole of the first switching tube Q1 are the drain electrode and the source electrode of the first switching tube Q1 respectively. The second active end b of the target switch S is connected to the first end of the self-locking circuit 201, the first active end c of the target switch S is connected to one end of the first resistor R1 through the second resistor R2 and is connected to the power interface 400, and the fixed end a of the target switch S is connected to the gate of the first switching tube Q1. The second end of the latch circuit 201 is connected to one end of the second resistor R2, and then connected to one end of the first resistor R1 and connected to the power interface 400.

When the voltage of the gate of the first switching tube Q1 is greater than or equal to 0.7V, the first pole of the first switching tube Q1 and the second stage of the first switching tube Q1 are turned on, and since the second stage of the first switching tube Q1 is grounded, the current flowing from the power interface 400 into the switching signal output circuit 100 flows to the ground, resulting in a low level pwr_en being output to the controlled device 300 by the signal output port P, and the controlled device 300 is in the on state.

When the voltage of the gate of the first switching tube Q1 is less than 0.7V, the first pole of the first switching tube Q1 and the second pole of the first switching tube Q1 are not turned on, so that the current flowing from the power interface 400 into the switching signal output circuit 100 does not flow to the ground, resulting in the signal output port P outputting the pwr_en high level to the controlled device 300, and the controlled device 300 is in the off state.

In one embodiment, as shown in fig. 3, a block diagram of a control circuit is provided, the control circuit 200 including a first control circuit 202 and a second control circuit 203; one end of the first control circuit 202 and one end of the second control circuit 203 are connected with the power interface 400, and the other end of the first control circuit is connected with the grid electrode of the first switching tube Q1; the second control circuit 203 comprises a target switch S and a self-locking circuit 201, the target switch S is a single-pole double-throw switch, a fixed end a of the single-pole double-throw switch SW1 is connected with a grid electrode of the first switch tube Q1, a first movable end c of the single-pole double-throw switch SW1 is connected with the power interface 400, a second movable end b of the single-pole double-throw switch SW1 is connected with one end of the self-locking circuit 201, and the other end of the self-locking circuit 201 is connected with the power interface 400.

In one embodiment, a grounding point is disposed between two ends of the first control circuit 202, the grounding point is grounded through the second switching tube Q2, and a gate of the second switching tube Q2 is connected to the power interface 400 through the first capacitor C1.

In one embodiment, one end of the first capacitor C1 connected to the gate of the second switching tube Q2 is connected to the first pole of the first switching tube Q1, where the first pole of the first switching tube Q1 is connected to the power interface 400.

In one embodiment, the switching circuit further includes a third capacitor C3, where one end of the third capacitor C3 is connected to the gate of the first switching tube Q1, and the other end is grounded.

The second switching tube Q2 may be a MOS tube, specifically an N-type MOS tube with a parasitic diode.

Optionally, the first control circuit 202 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, and a second switching tube Q2; the second control circuit 203 includes a second resistor R2, an eighth resistor R8, a target switch S, and a latch circuit 201; the switching signal output circuit 100 includes a first resistor R1, a first switching tube Q1, and a signal output port P.

One end of the first capacitor C1, one end of the fifth resistor R5, the second end of the latch circuit 201, one end of the second resistor R2, and one end of the first resistor R1 are all connected to each other and to the power interface 400. The other end of the first capacitor C1 is connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is connected to the first pole of the first switching tube Q1. The other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the gate of the first switching transistor Q1.

The first movable end c of the target switch S is connected to the other end of the second resistor R2, the second movable end b of the target switch S is connected to the first end of the self-locking circuit 201, the fixed end a of the target switch S is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected between the other end of the sixth resistor R6 and the gate of the first switching tube Q1.

The gate of the second switching tube Q2 is connected between the other end of the first capacitor C1 and one end of the seventh resistor R7, the first pole of the second switching tube Q2 is connected between the other end of the fifth resistor R5 and one end of the sixth resistor R6, and the second pole of the second switching tube Q2 is connected to the second pole of the first switching tube Q1 and grounded.

One end of the third capacitor C3 is connected to the other end of the eighth resistor R8, and the other end of the third capacitor C3 is connected between the second pole of the second switching tube Q2 and the second pole of the first switching tube Q1, where the second pole of the second switching tube Q2 is connected.

The principle of the switching circuit in this embodiment is as follows: when the second switching tube Q2 is preferentially turned on, most of the current flowing from the fifth resistor R5 passes through the first pole of the second switching tube Q2, then passes to the second pole of the second switching tube Q2, and then passes to the ground, so that the voltage of the gate electrode of the first switching tube Q1 is less than 0.7V, the first pole of the first switching tube Q1 and the second pole of the first switching tube Q1 are not turned on, and the signal output port P outputs the pwr_en high level.

When the first switching tube Q1 is preferentially turned on, most of the current flowing from the first capacitor C1 passes through the seventh resistor R7, then goes to the first pole of the first switching tube Q1, then goes to the second pole of the first switching tube Q1, and then goes to the ground, so that the voltage of the gate electrode of the second switching tube Q2 is less than 0.7V, and the first pole of the second switching tube Q2 and the second stage of the second switching tube Q2 are not turned on.

In one embodiment, as shown in fig. 4, a structure diagram of a target switch is provided, where the target switch S further includes a rear bin switch tube Q5, a first pole of the rear bin switch tube Q5 is connected to the first movable end c of the single pole double throw switch SW1, a second pole of the rear bin switch tube Q5 is connected to the fixed end a of the single pole double throw switch SW1, and a gate of the rear bin switch tube Q5 is connected to the rear bin control circuit 600.

The rear bin switch tube Q5 can be an MOS tube, and particularly can be an N-type MOS tube parasitic with a diode. The back office control circuit 600 may be a back office network switch board.

Alternatively, the post-bin control circuit 600 may input a post-bin signal to the post-bin switch tube Q5. When the rear bin signal is at a high level, the first pole and the second pole of the rear bin switch tube Q5 are conducted, and the state of the switch circuit corresponds to the state of the switch circuit when the single-pole double-throw switch SW1 is not released. When the rear bin signal is at a low level, the first pole and the second pole of the rear bin switch tube Q5 are not conducted, and the state of the switch circuit is equivalent to the state of the switch circuit when the blade is inserted into the knife box and the single-pole double-throw switch SW1 is not pressed, or the state of the switch circuit when the single-pole double-throw switch SW1 is pressed and released.

The remote batch operation control of the on/off of the controlled device 300 can be realized by inputting the rear bin signal to the rear bin switching tube Q5 to control the output of the on/off control signal. And batch power-on and AC (ALTERNATING CURRENT ) power-off test requirements are realized by inputting a rear bin signal to the rear bin switch tube Q5.

In one embodiment, as shown in fig. 5, there is provided a block diagram of a self-locking circuit, the self-locking circuit 201 including: the optical coupling switch Q4 comprises two input ports and two output ports, wherein the two input ports are connected with the power interface 400, and a first output port of the two output ports is connected with a second movable end b of the single-pole double-throw switch SW 1; the first pole of the third switching tube Q3 is connected with the second output port of the two output ports and connected with the first movable end c of the single-pole double-throw switch SW1, the second pole of the third switching tube Q3 is grounded, and the grid electrode of the third switching tube Q3 is connected with the second movable end of the single-pole double-throw switch SW 1; the second capacitor C2, the second capacitor C2 is connected to the second pole of the third switching tube Q3 and the gate of the third switching tube Q3, respectively.

The optocoupler switch Q4 includes an N-type MOS transistor and a light emitting diode, where the characteristic of the optocoupler switch Q4 is that when the voltage on the optocoupler switch Q4 is greater than the optocoupler threshold voltage, the optocoupler switch Q4 will not be turned on, where the optocoupler threshold voltage is a value obtained by subtracting the threshold voltage of the N-type MOS transistor in the optocoupler switch Q4 from the voltage of the power interface 400, for example, the voltage of the power interface 400 is 3.3V, the threshold voltage of the N-type MOS transistor is 0.7V, and when the voltage on the optocoupler switch Q4 is greater than or equal to 2.6V, the optocoupler switch Q4 is not turned on, and when the voltage on the optocoupler switch Q4 is less than 2.6V, the optocoupler switch Q4 is turned on. The third switching tube Q3 may be a MOS tube, specifically an N-type MOS tube with a parasitic diode.

In addition, the two input ports are respectively referred to a first pole of the N-type MOS tube and one end of the light-emitting diode; the first output port of the two output ports refers to the second pole of the N-type MOS tube, and the second output port of the two output ports refers to the other end of the light emitting diode.

Optionally, the self-locking circuit 201 includes a third resistor R3, a fourth resistor R4, an optocoupler Q4, a third switching tube Q3, and a second capacitor C2. One end of the third resistor R3, one end of the fourth resistor R4, one end of the first capacitor C1, one end of the fifth resistor R5, one end of the second resistor R2, one end of the first resistor R1 are connected to each other and to the power interface 400. The other end of the third resistor R3 is connected with the first pole of the N-type MOS tube, and the second pole of the N-type MOS tube is connected with the grid electrode of the third switching tube Q3. The other end of the fourth resistor R4 is connected with one end of a light-emitting diode, the other end of the light-emitting diode is connected with the first pole of the third switching tube Q3, and the second pole of the third switching tube Q3 is grounded. One end of the second capacitor C2 is connected between the second pole of the N-type MOS tube and the grid electrode of the third switching tube Q3, and the other end of the second capacitor C2 is connected with the second pole of the third switching tube Q3 and grounded.

The working principle of the self-locking circuit is as follows: when the voltage on the optocoupler switch Q4 is less than 2.6V, the optocoupler switch Q4 is turned on, that is, the first pole and the second pole of the N-type MOS transistor are turned on, the current passing through the fourth resistor R4 flows from the first pole of the N-type MOS transistor to the second pole of the N-type MOS transistor, and then to the gate of the third switch transistor Q3, so that the first pole and the second pole of the third switch transistor Q3 are turned on, and the current passing through the third resistor R3 flows from one end of the light emitting diode to the other end of the light emitting diode, then to the first pole of the third switch transistor Q3, and then to the second pole of the third switch transistor Q3 to the ground. Because the current flowing through the light emitting diode is grounded, the voltage of the optocoupler switch Q4 is smaller than 2.6V, the optocoupler switch Q4 is conducted, the N-type MOS tube is conducted when the optocoupler switch Q4 is conducted, the N-type MOS tube is conducted to conduct the third switch tube Q3, the third switch tube Q3 is conducted to ground the current flowing through the light emitting diode, and therefore the optocoupler switch Q4 is conducted, and self-locking is formed between the optocoupler switch Q4 and the third switch tube Q3.

Under the condition that the target switch S is restored to the original state after being pressed and released by the self-locking circuit 201, the switch signal output circuit 100 still can maintain to output a shutdown control signal or a startup control signal, so that when the blade is abnormally powered down and restarted, the target switch S is still in the original state, the situation that the blade server is started in a loading way, voltage disturbance is generated on a power supply bus and overcurrent pressure is caused on a hot plug circuit, under-voltage overvoltage protection is generated when the hot plug strip circuit or an adjacent blade is burnt out seriously is avoided, and the condition that the original state is restored after the target switch S is pressed and released each time does not exist, the condition that the switch key is not rebounded in the prior art, the blade is inserted into the blade box is not needed, and whether the switch key rebounds or not is detected one by one when the blade is inserted into the blade box in batches is avoided. Therefore, the application can achieve the purpose of improving the flexibility of controlling the output switch control signal.

In summary, as shown in fig. 6, the connection relationship between each device in the switch circuit of the most detailed switch circuit of the present application is clearly described in each embodiment of the switch circuit, which is not described herein, and the working principle of the switch circuit shown in fig. 6 for inputting the on/off control signal will be described below (note: for convenience of reading and understanding, the following numbers of each device are used, and the names are not repeated):

(1) As shown in fig. 7, a structural diagram of the state of the switching circuit when the switch is not targeted is provided. The blade is inserted into the knife box and is not connected with pin a and pin b of SW1 or inputs a low-level rear bin signal to Q5, an external power supply supplies 3.3V voltage to the switch circuit, and R2 is broken because pin a and pin c are disconnected; when R2 is broken, the voltage V3 at the other end of the light emitting diode is 3.3V and is High, and Q4 is not conducted due to High in the figure; if Q4 is not turned on, the voltage V4 at the second pole of the N-type MOS transistor is at a Low level, which is represented by Low in the figure, so that Q3 is not turned on, and therefore, the second control circuit 203 is in an off state; q2 is turned on preferentially due to the preferential conduction of C1, i.e., the gate voltage Vgate2 of Q2 is high; after Q2 is turned on, most of the current flowing from R5 will pass through the first and second poles of Q2 and then be grounded, and the current flowing into R6 is very small, so that the gate voltage Vgate1 of Q1 is low, and Q1 cannot be turned on; q1 is not conducted, PWR_EN high level can be output to the power supply sub-card through the signal output port P, namely a shutdown control signal is output, and the power supply sub-card is in a shutdown state.

(2) As shown in fig. 8, there is provided a structural diagram of the state of the switching circuit when the target switch is not released by being pressed. Pressing SW1, pin a and pin c of SW1 are connected, or a high level post bin signal is input to Q5. Vgate1 is connected to the power port through R8 and R2, and through R6 voltage division, vgate1 satisfies formula (1), and reaches the threshold voltage of Q1, so that Q1 is conducted; q1 is conducted, so that the voltage Vout at the signal output port P is pulled to the ground, and PWR_EN low level can be output to the power supply sub-card through the signal output port P, namely a start-up control signal is output, and the power supply sub-card is in a start-up state. Meanwhile, since Q1 is turned on, most of the current flowing from C3 will pass through R7, then Q1 and then ground, and the current flowing into Q2 is very small, so that the gate voltage Vgate2 of Q2 is low, and Q2 cannot be turned on. In addition, in this state, the voltage VR2 on R2 satisfies equation (2), is less than 0.7V, such that the voltage on Q4 is greater than 2.6V, meaning that R2 turns Q4 and Q3 off.

(3) As shown in fig. 9, there is provided a structural diagram of the state of the switching circuit when the push-down target switch is released. Releasing the connection of the pin a and the pin b of the SW1 or stopping inputting the high-level rear bin signal to the Q5, and turning on the Q4 to change the V4 into the high level; v4 is high, so that Q3 is conducted; q3 turns on so that V3 is pulled to ground, going low; because the capacitance of C2 is smaller than that of C3, when charging C2, vgate1 can maintain the high level of Vgate1, and then Q1 is conducted; q1 is turned on, vout is pulled to ground, while Vgate2 is pulled to ground with Vout, so that Q2 is not turned on, so Vgate1 is high, vout and Vgate2 are low, and pwr_en output to the power daughter card is low. Wherein, Q4 is turned on, V4 becomes high level, and V4 becomes high level to turn Q3 on, Q3 turns on to turn V3 low level, and V3 turns low level to turn Q4 on, so Q3 and Q4 constitute a self-locking circuit, Q1 and Q2 remain on and off respectively, so that the switching circuit keeps outputting low level to the power sub card pwr_en, and the power sub card is turned on.

(4) As shown in fig. 10, there is provided a configuration diagram of the state of the switching circuit when the target switch is pressed again without being released. And then the SW1 is pressed down, the pin a and the pin c of the SW1 are connected, or a high-level post-bin signal is input to the Q5. At this time, since the self-locking circuit is still in the self-locking state, V4 is still at high level and V3 is still at low level, when the a pin and the C pin are connected, most of the current flowing from R2 will pass through C2 and then be grounded. Meanwhile, vgate1 satisfies the formula (3) to be low level, and the partial voltage on R3 is lower than the threshold voltage of Q1, so that the threshold voltage of Q1 cannot be reached, and Q1 is not conducted; q1 is not conductive and most of the current flowing from C3 will flow to Q2, thereby turning Vgate2 high, rendering Q2 conductive. And Q1 is not conducted, vout is high level, and PWR_EN high level can be output to the power supply sub-card through the signal output port P, so that the power supply sub-card is in a shutdown state.

(5) As shown in fig. 11, there is provided a structural diagram of the state of the switching circuit when the target switch is pressed again to be released. The connection of the pin a and the pin b of the SW1 is released, or the input of the high-level post-bin signal to the Q5 is stopped. At this time, V4 satisfies the formula (4), is low, and cannot reach the threshold voltage of Q3, so that Q3 is not turned on, and V3 becomes high, so that the state of the switch circuit is restored to the state of the circuit when SW1 is not pressed as shown in fig. 7, and there is no fear that the blade server is started up with load when the blade server is started up next time or when the blade is pulled out.

(6) As shown in fig. 12, a structural diagram of the state of the switching circuit at the time of power failure is provided. After the blade is pulled out of the blade case or completely powered off, the voltage in the circuit is 0V, and when the blade is inserted into the blade case, the state of the switch circuit is restored to the state of the circuit when the non-push SW1 is not pushed as shown in FIG. 7.

In summary, the switch circuit of the present application has the following advantages:

(1) After the power-on state can be realized, the keys are self-locked, and the power-on state is maintained. A starting-up self-locking circuit is designed through a two-stage N-type MOS, and the requirement that a key is always on at one time is met.

(2) After abnormal shutdown, the key device automatically returns to the shutdown state, and the power daughter card is in the shutdown state. The insertion moment or the power-on moment of the input bus can avoid generating voltage disturbance to the direct current bus, improve the power supply reliability and protect the hot plug circuit.

(3) And the blade power daughter cards are started remotely in batches, so that manual operation is reduced. Meanwhile, the AC on-off test can be met.

(4) The switch circuit only uses MOS tube, capacitor and resistor, and the cost is low.

In one embodiment, as shown in fig. 13, there is provided a block diagram of a switching apparatus 1300 including any one of the switching circuits described above and a power sub-card 1301, wherein the power sub-card is connected to the switching circuit as a controlled device 300.

In one embodiment, there is provided a switching device 1300 further comprising: a power supply bus 1302; the first end of the hot plug circuit 1303 is connected with the power supply bus 1302, and the second end of the hot plug circuit 1303 is connected with the first end of the power supply daughter card 1301; a server motherboard 1304, the server motherboard 1304 being connected to a second end of the power daughter 1301 card; the isolation transformer circuit 1305, a first end of the isolation transformer circuit 1305 is connected to the power supply bus 1302, and a second end of the isolation transformer circuit 1305 is connected to the server motherboard 1304.

In one embodiment, the power interface 400 in the switching circuit is connected to an isolation transformer circuit 1305.

In one embodiment, the signal output port P in the switching circuit is connected to the power daughter card 1301.

The hot plug circuit 1303 has a function of reducing an instantaneous surge current to avoid damaging a subsequent input circuit. The power daughter card 1301 has a function of converting the power supply voltage supplied from the power supply bus into the operating voltage required by the server motherboard 1304, and improving the power supply reliability. The isolation transformer circuit 1305 has a function of converting a power supply voltage supplied from a power supply bus into a start-up voltage and supplying the start-up voltage to the server main board 1304, thereby supplying power to a control section in the server main board 1304.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, herein are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless explicitly defined otherwise.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims

1. A switching circuit, the switching circuit comprising:

The switching signal output circuit is used for sending a switching control signal to the controlled equipment, wherein the switching control signal comprises a shutdown control signal and a startup control signal;

The control circuit is connected with the switch signal output circuit and comprises a target switch and a self-locking circuit;

The target switch is pressed and released under the condition that the switch signal output circuit outputs the shutdown control signal, and then is restored to an original state, and after the target switch is restored to the original state, the self-locking circuit enters a self-locking conducting state so as to control the switch signal output circuit to continuously output the startup control signal, the target switch is restored to the original state after being pressed and released under the condition that the switch signal output circuit outputs the startup control signal, and after the target switch is restored to the original state, the self-locking circuit enters an off state so as to control the switch signal output circuit to continuously output the shutdown control signal.

2. The switching circuit of claim 1, further comprising a power interface for connection to an external power source;

One end of the switching signal output circuit is connected with the power interface, the other end of the switching signal output circuit is grounded, the switching signal output circuit comprises a first switching tube and a signal output port which are connected with each other, and different on-off states of the first switching tube correspond to the signal output port to output different types of switching control signals;

the control circuit is connected with the grid electrode of the first switching tube so as to control the on-off of the first switching tube.

3. The switching circuit of claim 2, wherein the control circuit comprises a first control circuit and a second control circuit;

One end of the first control circuit and one end of the second control circuit are connected with the power interface, and the other end of the first control circuit is connected with the grid electrode of the first switching tube;

the second control circuit comprises the target switch and the self-locking circuit, the target switch is a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected with the grid electrode of the first switch tube, the first movable end of the single-pole double-throw switch is connected with the power interface, the second movable end of the single-pole double-throw switch is connected with one end of the self-locking circuit, and the other end of the self-locking circuit is connected with the power interface.

4. The switching circuit of claim 3 wherein the target switch further comprises a back-bin switching tube, a first pole of the back-bin switching tube is connected to the first movable end of the single pole double throw switch, a second pole of the back-bin switching tube is connected to the fixed end of the single pole double throw switch, and a gate of the back-bin switching tube is connected to a back-bin control circuit.

5. A switching circuit according to claim 3, wherein a ground point is provided between the two ends of the first control circuit, the ground point being grounded via a second switching tube, the gate of the second switching tube being connected to the power interface via a first capacitor.

6. The switching circuit of claim 5 wherein the end of the first capacitor connected to the gate of the second switching tube is connected to a first pole of the first switching tube, wherein the first pole of the first switching tube is connected to the power interface.

7. A switching circuit according to claim 3, wherein the self-locking circuit comprises:

the optical coupler switch comprises two input ports and two output ports, wherein the two input ports are connected with the power interface, and a first output port of the two output ports is connected with a second movable end of the single-pole double-throw switch;

The first pole of the third switching tube is connected with the second output port of the two output ports and the first movable end of the single-pole double-throw switch, the second pole of the third switching tube is grounded, and the grid electrode of the third switching tube is connected with the second movable end of the single-pole double-throw switch;

And the second capacitor is respectively connected with the second pole of the third switching tube and the grid electrode of the third switching tube.

8. A switching circuit according to claim 3, further comprising a third capacitor having one end connected to the gate of the first switching tube and the other end grounded.

9. A switching device comprising a switching circuit according to any one of claims 1 to 8 and a power supply sub-card, wherein the power supply sub-card is connected as a controlled device to the switching circuit.

10. The switching device of claim 9, further comprising:

A power supply bus;

the first end of the hot plug circuit is connected with the power supply bus, and the second end of the hot plug circuit is connected with the first end of the power supply sub-card;

the server main board is connected with the second end of the power daughter card;

and the first end of the isolation transformer circuit is connected with the power supply bus, and the second end of the isolation transformer circuit is connected with the server main board.

11. The switching device of claim 10, wherein a power interface in the switching circuit is connected to the isolation transformer circuit.