CN107834826B - Power supply control module - Google Patents
Power supply control module Download PDFInfo
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- CN107834826B CN107834826B CN201711059754.4A CN201711059754A CN107834826B CN 107834826 B CN107834826 B CN 107834826B CN 201711059754 A CN201711059754 A CN 201711059754A CN 107834826 B CN107834826 B CN 107834826B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000005669 field effect Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000004146 energy storage Methods 0.000 claims description 27
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000003071 parasitic effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000001052 transient effect Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/071—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate a negative voltage output from a positive voltage source
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/072—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate an output voltage whose value is lower than the input voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply control module, which comprises an input protection filter circuit unit, a power failure maintaining circuit unit, an auxiliary power supply circuit unit, a control circuit unit, a detection circuit unit and a DC/DC conversion and output filter circuit unit, wherein the input protection filter circuit unit protects the polarity reversal of an input power supply by implementing unidirectional conduction on an externally input power supply, and a circuit formed by an N-channel field effect transistor and a driver thereof is adopted on an input path to realize the protection and isolation of the power supply input; the power-down maintaining circuit unit maintains normal power output for a certain time under the condition that the input power is suddenly powered down; the auxiliary power supply circuit unit supplies power to the control circuit unit and the detection circuit unit; the control circuit unit controls the working mode and state of the power supply control module, and the detection circuit unit automatically cuts off the output power supply and sends an interrupt signal outwards when the power supply module is abnormal; the DC/DC conversion and output filter circuit unit converts the input voltage into different direct current voltage sources.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of electronics, and particularly relates to a power supply control module.
[ background of the invention ]
The power supply module is a power source module in an electronic product, and provides power source input for other functional modules in the product, and the power supply module is an indispensable component in consumer electronics, vehicle-mounted electronics and aerospace electronics. Taking an aviation type power supply module as an example, as shown in fig. 1, the aviation type power supply module converts an external 28V input power into various types of direct current power required by other modules in a product, such as +5V, -5V and +3.3V, and provides necessary control signals, such as a power-on RESET signal RESET and a power-off interrupt signal INT.
The power supply module generally includes 6 circuit units, which are an input protection filter circuit unit, a power-down maintaining circuit unit, an auxiliary power circuit unit, a control circuit unit, a detection circuit unit, and a DC/DC conversion and output filter circuit unit, and each of the circuit units is specifically described below.
The input protection filter circuit unit is used for conducting unidirectional conduction operation on an externally input power supply to prevent irreversible damage to a product caused by reverse connection of the input power supply, and generally comprises an inertia fuse, a Schottky diode, a transient voltage suppression bidirectional diode and a filter capacitor, wherein the inertia fuse allows transient overcurrent to pass when the computer is started, the Schottky diode is used for preventing a circuit from being damaged due to reverse connection of the input voltage, and the transient voltage suppression bidirectional diode and the filter capacitor are respectively used for absorbing input transient surge and filtering high-frequency ripples parasitized on a direct-current power supply.
The power failure maintaining circuit unit is used for maintaining normal power output for a certain time by the power supply module under the condition that an input power supply suddenly fails to power down so as to ensure that products can be protected on site before power down and avoid damage to the products, and the power failure maintaining circuit unit is generally realized by discharging of an energy storage capacitor and has two common modes of open energy storage and controllable energy storage.
The auxiliary power supply circuit unit is used for supplying power to the control circuit unit and the detection circuit unit in the power supply module.
The control circuit unit is used for controlling the working mode and the working state of the power supply module and mainly comprises an instantaneous power-off protection circuit, a power-on delay circuit, a DC-DC output control circuit, an external signal starting circuit and the like, wherein the DC-DC output control circuit generally adopts a parallel output control mode.
The detection circuit unit mainly comprises an overvoltage and undervoltage detection circuit, an over-temperature detection circuit and the like, so that when the voltage of the input end and the output end of the power supply module is abnormal or when the temperature switch element senses over-temperature, the output power supply is automatically cut off, and meanwhile, an interrupt signal is sent outwards.
The DC/DC conversion and output filter circuit unit selects a DC-DC conversion chip to convert the input voltage into various voltage values, and a filter circuit consisting of capacitors is distributed at each output voltage port.
Although the power supply module adopting the conventional technology can meet the application requirements of many occasions, the power supply module is difficult to optimize in the aspects of performance, reliability, volume, cost, power consumption and the like, and has the following three main problems.
In a first aspect: in the existing power supply module, schottky diodes are arranged in an input protection filter circuit unit to realize power input protection isolation, and the purpose of forward pass and reverse isolation is achieved by utilizing the unidirectional conduction characteristic of the diodes, but as shown in fig. 2, the diodes are not ideal zero impedance in a forward conduction working state, a large voltage drop is generated on the diodes during large current, heat consumption is large, and good heat dissipation facilities are needed.
The second aspect is that the existing power-down maintaining circuit unit is generally realized by charging and discharging of an energy storage capacitor, the power-down maintaining output time of the energy storage capacitor can be obtained by a formula ①, the common open energy storage and controllable energy storage principles are shown in fig. 3 and 4, the two energy storage modes are simple in circuit and greatly affected by the input power voltage, the utilization rate of the energy storage capacitor is low, the required capacitance is large, the large-volume capacitor occupies the installation space, and the design difficulty and cost are improved.
Wherein C: capacity value of energy storage capacitor
P: input power of product
Δ t: power down hold output time
V1: maximum voltage value at two ends of capacitor capable of working normally
V2: the product can work normally by the minimum voltage value at two ends of the capacitor
In a third aspect: the existing DC/DC conversion and output filter circuit unit adopts a parallel power output control mode, as shown in fig. 5, the hidden trouble of start failure can occur when the product is powered on or powered off quickly because: (1) for example, when the load of +5V is far larger than that of-5V, when the power is off, the power is off completely after the power is off completely at +5V for a long time (more than or equal to 50ms) -5V; (2) the 5V can be coupled to the +5V terminal through other functional modules, and generates a not small negative voltage at the +5V terminal; (3) the +5V DC-DC module adopts a synchronous rectification output technology, and when the negative voltage of the output end exceeds a certain threshold (for example ≧ 0.3V), the output fault is considered to enter a protection state to close the output.
[ summary of the invention ]
The present invention is directed to a power control module for solving the above problems of the conventional power supply module.
In order to achieve the above purpose, the power control module of the present invention includes an input protection filter circuit unit, a power down maintaining circuit unit, an auxiliary power circuit unit, a control circuit unit, a detection circuit unit, and a DC/DC conversion and output filter circuit unit, wherein the input protection filter circuit unit protects the polarity inversion of an input power by implementing unidirectional conduction to an externally input power, and a circuit composed of an N-channel field effect transistor and a driver thereof is adopted on an input path to implement the protection isolation of the power input; the power-down maintaining circuit unit is used for maintaining normal power output for a certain time by the power supply module under the condition that the input power is suddenly powered down; the auxiliary power supply circuit unit is used for supplying power to the control circuit unit and the detection circuit unit in the power supply module; the control circuit unit is used for controlling the working mode and the working state of the power supply module, and the detection circuit unit automatically cuts off the output power supply and simultaneously sends an interrupt signal outwards when the voltage of the input and output ends of the power supply module is abnormal or when the temperature switch element senses over-temperature; the DC/DC conversion and output filter circuit unit comprises a DC-DC conversion chip for converting input voltage into various voltage values, and each output voltage port is distributed with a filter circuit consisting of capacitors.
Preferably, a circuit formed by the N-channel field effect transistor and the driver thereof is similar to an ideal diode, when the circuit works, the driver generates a voltage difference larger than 10V at two ends of a grid-source of the field effect transistor, the field effect transistor is completely conducted at the moment, the conduction impedance between a source electrode and a drain electrode is very low, and the voltage difference is very small when a large current passes through the circuit; during protection, the driver enables the voltage difference between two ends of a grid and a source of the field effect transistor to be approximate to 0V, and at the moment, the impedance between the source and a drain is infinite, so that current cannot flow; meanwhile, the direction of the parasitic internal diode of the field effect transistor is consistent with the normal working current direction, and the field effect transistor is cut off reversely.
Preferably, the power-down maintaining circuit unit further comprises a voltage boosting circuit, and when the power-down maintaining circuit unit normally works, the external power supply boosts the input voltage to a set voltage through the voltage boosting circuit to charge the energy storage capacitor; when power failure occurs, after the detection circuit detects that the input voltage is lower than the discharge threshold, the control circuit controls the controllable switch to start the energy storage capacitor to discharge, and normal power output for a certain time is maintained.
Preferably, the DC/DC conversion and output filter circuit unit is provided with a corresponding second control circuit for turning on or off the-5V output based on the +5V output.
Preferably, the second control circuit comprises a zener diode, a resistor and an optocoupler which are connected in series, when the voltage of the output 5V power supply is greater than 4V, the zener diode is broken down in a reverse direction, the current flows through the primary stage of the optocoupler and is connected to the output 5V ground through the resistor for current limiting, the output of the third control circuit of the secondary stage of the optocoupler is controlled to be a high level signal, the output is connected with a-5V DC/DC enable control end, and the DC/DC enable control end enables the high level to output the-5V power supply; when the output 5V power voltage is less than 4V, the power voltage cannot break down the voltage stabilizing diode, no current flows through the primary side of the optical coupler, the output of the secondary side of the optical coupler is a low level signal, the-5V DC/DC enable level is set to be low, and the-5V power supply is turned off.
Compared with the prior art, the power supply module provided by the invention can meet the application requirements of all occasions, has the advantages of good performance and high reliability, and can realize miniaturization, low cost and low power consumption. These techniques have been practically applied to avionics products.
[ description of the drawings ]
Fig. 1 is a schematic diagram illustrating a conventional aviation-type power supply module.
Fig. 2 is a schematic diagram of the conduction characteristic of the diode.
Fig. 3 is a schematic diagram of an open tank circuit.
Fig. 4 is a schematic diagram of a controllable tank circuit.
Fig. 5 is a schematic diagram of a conventional DC/DC conversion and output filter circuit unit.
Fig. 6 is a circuit diagram of an input protection filter circuit unit according to the present invention.
Fig. 7 is a circuit diagram of the power down maintaining circuit unit of the present invention.
Fig. 8 is a power waveform diagram of the power down maintenance circuit unit shown in fig. 7.
Fig. 9 is a circuit diagram of the DC/DC conversion and output filter circuit unit according to the present invention.
[ detailed description ] embodiments
The power supply control module for implementing the invention also comprises an input protection filter circuit unit, a power failure maintaining circuit unit, an auxiliary power supply circuit unit, a control circuit unit, a detection circuit unit and a DC/DC conversion and output filter circuit unit, the functions of each circuit unit can be referred to the background technology, the detailed description is omitted, and the invention only aims at the local improvement of the input protection filter circuit unit, the power failure maintaining circuit unit and the DC/DC conversion and output filter circuit unit. Only the improvement points of the above three units will be described in detail below.
As shown in FIG. 6, the input protection filter circuit unit of the present invention uses a circuit composed of an N-channel FET and a driver thereof to realize the protection isolation of the power input on the input path, the circuit composed of the N-channel FET and the driver thereof is similar to an ideal diode, when the present invention works, the driver generates a voltage difference larger than 10V at the two ends of the gate (G) -source (S) of the FET, i.e., VGS > 10V, at this time, the FET is completely conducted, the conduction impedance between the source (S) -drain (D) electrodes is very low (generally several m Ω -several tens m Ω), the voltage difference is very small when a large current is passed, therefore, the generated heat is also very small, so the requirement for heat dissipation is also low, and the whole conversion efficiency of the power supply module is improved. . During protection, the driver enables the voltage difference between two ends of a gate (G) and a source (S) of the field effect transistor to be approximate to 0V, namely VGS is 0V, and at the moment, the impedance between the source (S) and a drain (D) is infinite, so that current cannot flow; meanwhile, the parasitic internal diode direction of the field effect transistor is consistent with the normal working current direction, and the field effect transistor is cut off in the reverse direction; therefore, the circuit formed by the N-channel field effect transistor and the driver thereof is isolated in forward conduction and reverse cut-off.
As shown in FIG. 7, in the invention, a boost circuit is added on a traditional energy storage maintaining circuit in a power-down maintaining circuit unit, the maximum voltage value V1 at two ends of an energy storage capacitor is increased, when the power-down maintaining circuit unit normally works, an external power supply boosts an input voltage to a set voltage through the boost circuit to charge the energy storage capacitor, when a power-down occurs, a control circuit controls a controllable switch to start the energy storage capacitor to discharge and maintain a normal power output for a certain time after detecting that the input voltage is lower than a discharge threshold, according to a formula ① mentioned in the background technology, under the condition that delta t is the same, V1 is increased, the capacitance value of the energy storage capacitor C can be greatly reduced, the comparison of parameters in a table 1 can be known, the capacitance required by the power-down maintaining time of 200ms is less than 1/3 before boosting, a power waveform of a boost type energy storage maintaining technology is shown in FIG. 8, when the power supply waveform of the boost type energy storage maintaining technology normally works, the input voltage (shown by a dotted line 2 in the DC/DC conversion circuit) works in the graph, the input voltage (shown by an input voltage-upper limit voltage, when the power-storage capacitor is normally works, the power-up voltage maintaining circuit unit is normally works, and the energy storage capacitor is detected, the energy storage capacitor is reduced by a dotted line, and the cost is reduced, so that the energy storage capacitor is reduced when the energy storage capacitor is reduced.
| Serial number | Input power | Maximum voltage of energy storage capacitor | Minimum voltage of energy storage capacitor | Power down hold time | Capacitance value |
| 1 | |
28V | 18V | 200ms | 26000uF |
| 2 | 30W | 44V | 18V | 200ms | 7400uF |
Table 1 storage maintenance parameter comparison table
As shown in fig. 9, the second control circuit is added on the basis of the cascade power output control technology and on the basis of the parallel power output control mode, and the output of-5V is turned on or off by taking the output of +5V as the judgment condition, so that the output of-5V is preceded by the output of-5V whenever +5V is preceded by the output of-5V, and the problem that the output of the power supply of +5V cannot be realized because the power supply of +5V is preceded by the power supply of-5V is solved. In specific implementation, the 5V output is judged by connecting a voltage stabilizing diode, a resistor and an optocoupler in series to form an isolation detection control switch. When the voltage of an output 5V power supply is greater than 4V, a voltage stabilizing diode is broken down reversely, current flows through a primary side of an optical coupler and is connected to an output 5V ground through resistance current limiting, a third control circuit of a secondary side of the optical coupler is controlled to output a high-level signal, the output is connected with a DC/DC enabling control end of-5V, and the DC/DC enabling end is set to be high to output a-5V power supply; when the output 5V power voltage is less than 4V, the power voltage cannot break down the voltage stabilizing diode, no current flows through the primary side of the optical coupler, the output of the secondary side of the optical coupler is a low level signal, the-5V DC/DC enable level is set to be low, and the-5V power supply is turned off.
Compared with the prior art, the power supply module provided by the invention can meet the application requirements of all occasions, has the advantages of good performance and high reliability, and can realize miniaturization, low cost and low power consumption. These techniques have been practically applied to avionics products.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (3)
1. A power supply control module comprises an input protection filter circuit unit, a power failure maintaining circuit unit, an auxiliary power supply circuit unit, a control circuit unit, a detection circuit unit and a DC/DC conversion and output filter circuit unit, wherein the input protection filter circuit unit protects the polarity inversion of an input power supply by implementing unidirectional conduction to the externally input power supply, and a circuit formed by an N-channel field effect transistor and a driver thereof is adopted on an input path to realize the protection and isolation of the power supply input; the power failure maintaining circuit unit can continuously maintain normal power output for a certain time under the condition that the input power is suddenly powered down; the auxiliary power supply circuit unit is used for supplying power to the control circuit unit and the detection circuit unit in the power supply control module; the control circuit unit is used for controlling the working mode and the working state of the power supply control module; when the voltage of the input and output ends of the power supply module is abnormal or when the temperature switch element senses over-temperature, the detection circuit unit automatically cuts off the output power supply and simultaneously sends an interrupt signal to the outside;
the DC/DC conversion and output filter circuit unit comprises a DC-DC conversion chip for converting input voltage into various voltage values, and each output voltage port is distributed with a filter circuit consisting of capacitors; the DC/DC conversion and output filter circuit unit also comprises a second control circuit, the second control circuit comprises a voltage stabilizing diode, a resistor and an optical coupler which are connected in series, the output of a third control circuit for controlling the secondary side of the optical coupler is connected with a negative voltage enabling port of the DC-DC conversion chip, when the voltage output by a positive voltage output port of the DC-DC conversion chip is greater than a threshold value, the voltage stabilizing diode is punctured in a reverse direction, the current flows through the primary side of the optical coupler and is limited by the resistor, and the third control circuit outputs a high level signal to enable the DC-DC conversion chip to output a negative voltage; when the voltage output by the positive voltage output port of the DC-DC conversion chip is smaller than the threshold value, the power supply voltage cannot break down the voltage stabilizing diode, no current flows through the primary side of the optical coupler, and the output of the third control circuit is a low level signal, so that the DC-DC conversion chip closes the negative voltage output.
2. The power control module of claim 1, wherein: the N-channel field effect transistor and a circuit formed by the driver thereof are similar to an ideal diode, when the N-channel field effect transistor works, the driver generates a voltage difference of more than 10V at two ends of a grid-source of the N-channel field effect transistor, the N-channel field effect transistor is completely conducted at the moment, the conduction impedance between a source electrode and a drain electrode is very low, and the voltage difference is very small when a large current passes through the N; during protection, the driver enables the voltage difference between two ends of a grid and a source of the field effect transistor to be approximate to 0V, and at the moment, the impedance between the source and a drain is infinite, so that current cannot flow; meanwhile, the direction of the parasitic internal diode of the field effect transistor is consistent with the normal working current direction, and the field effect transistor is cut off reversely.
3. The power control module of claim 1, wherein: the power failure maintaining circuit unit also comprises a booster circuit, and when the power failure maintaining circuit unit works normally, an external power supply boosts an input voltage to a set voltage through the booster circuit to charge an energy storage capacitor; when power failure occurs, after the detection circuit detects that the input voltage is lower than the discharge threshold, the control circuit controls the controllable switch to start the energy storage capacitor to discharge, and normal power output for a certain time is maintained.
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| CN201711059754.4A CN107834826B (en) | 2017-11-01 | 2017-11-01 | Power supply control module |
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| CN113036899A (en) * | 2021-03-10 | 2021-06-25 | 中国科学院长春光学精密机械与物理研究所 | Undervoltage and power-down protection system of aviation photoelectric equipment |
| CN113315360A (en) * | 2021-05-07 | 2021-08-27 | 北京军陶科技有限公司 | Anti-transient-outage power supply and equipment based on capacitor boosting energy storage |
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| CN102111011A (en) * | 2011-02-28 | 2011-06-29 | 华为技术有限公司 | Power failure maintaining method and circuit |
| CN103280968A (en) * | 2013-05-09 | 2013-09-04 | 中国电子科技集团公司第二十四研究所 | Timing control circuit of pulse power supply |
| CN203660640U (en) * | 2013-11-26 | 2014-06-18 | 洛阳隆盛科技有限责任公司 | Economical power failure maintenance circuit |
| CN103973087A (en) * | 2013-02-05 | 2014-08-06 | 中兴通讯股份有限公司 | Power-down holding circuit |
| CN205039513U (en) * | 2015-09-06 | 2016-02-17 | 洛阳隆盛科技有限责任公司 | High -power circuit protector against power failure of high efficiency |
| CN107181295A (en) * | 2017-05-10 | 2017-09-19 | 上海空间电源研究所 | A kind of space integration battery discharging on-off circuit |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111011A (en) * | 2011-02-28 | 2011-06-29 | 华为技术有限公司 | Power failure maintaining method and circuit |
| CN103973087A (en) * | 2013-02-05 | 2014-08-06 | 中兴通讯股份有限公司 | Power-down holding circuit |
| CN103280968A (en) * | 2013-05-09 | 2013-09-04 | 中国电子科技集团公司第二十四研究所 | Timing control circuit of pulse power supply |
| CN203660640U (en) * | 2013-11-26 | 2014-06-18 | 洛阳隆盛科技有限责任公司 | Economical power failure maintenance circuit |
| CN205039513U (en) * | 2015-09-06 | 2016-02-17 | 洛阳隆盛科技有限责任公司 | High -power circuit protector against power failure of high efficiency |
| CN107181295A (en) * | 2017-05-10 | 2017-09-19 | 上海空间电源研究所 | A kind of space integration battery discharging on-off circuit |
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| CN107834826A (en) | 2018-03-23 |
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