CN222508781U - Automatic discharge circuit of motor back electromotive force and swing-type speed gate - Google Patents
Automatic discharge circuit of motor back electromotive force and swing-type speed gate Download PDFInfo
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- CN222508781U CN222508781U CN202420972698.2U CN202420972698U CN222508781U CN 222508781 U CN222508781 U CN 222508781U CN 202420972698 U CN202420972698 U CN 202420972698U CN 222508781 U CN222508781 U CN 222508781U
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Abstract
本实用新型涉及电机技术领域，尤其涉及一种电机反电动势自动泄放电路及摆式速通门。本实用新型通过设置无源的反电动势泄放单元和单向导通单元，使电机产生反电动势时，反电动势泄放单元的自动导通以及单向导通单元的自动切断，从而实现反电动势的自动泄放，能够稳定保护单板器件不受电机反电动势损坏，实现固定、通用的器件选型，不受电机型号、单板器件耐压值影响；同时，设备在断电情况下仍然能够泄放反电动势，对单板进行保护。
The utility model relates to the technical field of motors, and in particular to an automatic discharge circuit for motor back electromotive force and a swing-type fast-pass gate. The utility model provides a passive back electromotive force discharge unit and a unidirectional conduction unit, so that when the motor generates back electromotive force, the back electromotive force discharge unit is automatically turned on and the unidirectional conduction unit is automatically cut off, thereby realizing automatic discharge of back electromotive force, being able to stably protect single-board devices from damage by motor back electromotive force, realizing fixed and universal device selection, and being unaffected by motor models and single-board device withstand voltage values; at the same time, the device can still discharge back electromotive force in the case of power failure to protect the single board.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to an automatic back electromotive force discharging circuit of a motor and a pendulum type speed pass gate.
Background
The pendulum type quick-passing door is increasingly applied in the current society, the environment is more and more complicated, the phenomenon that personnel rushes to break a gate sometimes happens, the gate swing door is controlled through a motor, an MCU (micro control unit) controls the motor to rotate so as to drive a door wing to open and close the door during normal operation, but under the abnormal condition that some personnel rushes to break the gate, the door wing is driven to rotate by external force after being collided, at the moment, the motor is driven by the door wing to rotate together, and due to the effect of the external force, the motor becomes a generator at the moment, counter electromotive force is reversely input into a single board, and when the protection of the single board is insufficient, the single board is easy to damage.
In the prior art, a voltage stabilizing device is connected to a circuit to protect counter electromotive force generated by a motor, and in other technical schemes, a voltage monitoring unit is introduced to monitor the counter electromotive force generated by the motor and electrically control discharge, so that the damage of the counter electromotive force to an upper circuit is avoided.
However, the prior art has the defects that the voltage stabilizing device specification needs to be matched with the chip and device voltage-resistant specification in a circuit, the voltage stabilizing device is not easy to select, the high voltage-resistant device matched with the device type can introduce higher hardware and design cost, the MCU needs to be continuously powered by the voltage monitoring technical scheme, the MCU is not available when the power is off, and the problem that counter electromotive force is still generated when the motor is off can not be solved.
Disclosure of utility model
The utility model provides an automatic motor back electromotive force discharging circuit and a pendulum type speed pass gate, which are used for realizing motor back electromotive force discharging and single plate protection in a low-cost speed pass gate motor.
The utility model provides an automatic back electromotive force bleeder circuit of a motor, which comprises:
Three-phase bridge circuit, back electromotive force relief unit and one-way conduction unit, wherein:
The three-phase bridge circuit is electrically connected with the motor and is used for supplying power to the motor;
The back electromotive force discharge unit is electrically connected with the motor and is used for discharging back electromotive force generated by the motor;
The unidirectional conduction unit comprises a first end and a second end, wherein the first end of the unidirectional conduction unit is electrically connected with the three-phase bridge circuit, and the second end of the unidirectional conduction unit is electrically connected with the bus and used for cutting off the electrical connection between the three-phase bridge circuit and the bus when the motor generates counter electromotive force.
According to the automatic back electromotive force bleeder circuit of the motor, the back electromotive force bleeder unit comprises a P-channel MOSFET field effect transistor and a bleeder resistor, wherein the grid electrode of the P-channel MOSFET field effect transistor is electrically connected with a bus, the source electrode is electrically connected with U-phase, V-phase and W-phase power supply ends of the motor, the drain electrode is electrically connected with the bleeder resistor, and the bleeder resistor is grounded.
According to the motor back electromotive force automatic bleeder circuit, the starting voltage of the P-channel MOSFET is not more than a preset voltage.
According to the motor back electromotive force automatic bleeder circuit, the resistance value of the bleeder resistor is smaller than a preset resistance value.
According to the motor back electromotive force automatic bleeder circuit, the unidirectional conduction unit is a diode, the cathode of the diode is electrically connected with the three-phase bridge circuit, and the anode of the diode is electrically connected with the bus.
According to the motor back electromotive force automatic relief circuit of the present utility model, the back electromotive force relief unit includes a U-phase back electromotive force relief unit, a V-phase back electromotive force relief unit, a W-phase back electromotive force relief unit, wherein:
The U-phase counter electromotive force discharging unit is electrically connected with a U-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the U phase;
the V-phase counter electromotive force discharging unit is electrically connected with a V-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the V phase;
The W-phase counter electromotive force discharging unit is electrically connected with a W-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the W phase.
According to the motor back electromotive force automatic bleeder circuit, the U-phase back electromotive force bleeder unit comprises a first P-channel MOSFET field effect tube and a first bleeder resistor, wherein the grid electrode of the first P-channel MOSFET field effect tube is electrically connected with a bus, the source electrode of the first P-channel MOSFET field effect tube is electrically connected with a U-phase power supply end of the motor, and the drain electrode of the first P-channel MOSFET field effect tube is electrically connected with the first bleeder resistor;
the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are grounded.
According to the motor back electromotive force automatic bleeder circuit, the resistance values of the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are the same, and the starting voltage of the first P-channel MOSFET field effect transistor, the second P-channel MOSFET field effect transistor and the third P-channel MOSFET field effect transistor is not larger than a preset voltage.
According to the motor counter electromotive force automatic bleeder circuit, the unidirectional conduction unit comprises a U-phase unidirectional conduction unit, a V-phase unidirectional conduction unit and a W-phase unidirectional conduction unit, wherein the first end of the U-phase unidirectional conduction unit is electrically connected with a U-phase power supply circuit of a three-phase bridge circuit, the first end of the V-phase unidirectional conduction unit is electrically connected with a V-phase power supply circuit of the three-phase bridge circuit, the first end of the W-phase unidirectional conduction unit is electrically connected with a W-phase power supply circuit of the three-phase bridge circuit, and the second ends of the U-phase unidirectional conduction unit, the V-phase unidirectional conduction unit and the W-phase unidirectional conduction unit are all electrically connected with a bus.
The utility model also provides a pendulum type speed pass gate, which comprises a motor and a motor control circuit, wherein the motor control circuit comprises the motor back electromotive force automatic bleeder circuit provided by the utility model.
The motor counter electromotive force automatic discharging circuit and the pendulum type speed pass gate provided by the utility model have the advantages that the passive counter electromotive force discharging unit and the unidirectional conducting unit are arranged, so that when the motor generates counter electromotive force, the automatic conduction of the counter electromotive force discharging unit and the automatic cutting-off of the unidirectional conducting unit are realized, the automatic discharging of the counter electromotive force is realized, a single board device can be stably protected from being damaged by the counter electromotive force of the motor, the fixed and universal device selection is realized, the influence of the motor model and the withstand voltage value of the single board device is avoided, and meanwhile, the equipment can still discharge the counter electromotive force under the condition of power failure, and the single board is protected.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a motor back electromotive force automatic bleeding circuit provided by the utility model;
fig. 2 is a schematic diagram of a U-phase motor control circuit of the motor back electromotive force automatic bleeding circuit provided by the utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The motor back electromotive force automatic bleeding circuit and the pendulum type speed gate of the present utility model are described below with reference to fig. 1 to 2.
Fig. 1 is a schematic structural diagram of an automatic back electromotive force bleeding circuit of a motor according to an embodiment of the present utility model, as shown in fig. 1, including a three-phase bridge circuit 110, a back electromotive force bleeding unit 120, and a unidirectional conduction unit 130, wherein:
The three-phase bridge circuit 110 is electrically connected with the motor and is used for supplying power to the motor;
The back electromotive force discharge unit 120 is electrically connected with the motor and is used for discharging back electromotive force generated by the motor, and the back electromotive force discharge unit 120 is also electrically connected with a bus;
The unidirectional conduction unit 130 includes a first end and a second end, the first end of the unidirectional conduction unit 130 is electrically connected with the three-phase bridge circuit, and the second end is electrically connected with the bus bar, for cutting off the electrical connection between the three-phase bridge circuit 110 and the bus bar when the motor generates back electromotive force.
In the embodiment of the utility model, the motor can be a direct current brushless motor.
In the embodiment of the utility model, the three-phase bridge circuit can be a bridge circuit based on MOS (metal oxide semiconductor) or a circuit used for converting direct current into three-phase power of the motor in a switching circuit, a diode or other forms, when the motor works normally, the unidirectional conduction unit is conducted, the three-phase bridge circuit controls the current input of the motor through signals transmitted by the bus to realize the operation of the motor, when the motor generates counter electromotive force due to the action of external force, the unidirectional conduction unit cuts off the electric connection of the three-phase bridge circuit and the bus, so that the counter electromotive force cannot be transmitted into the bus through the three-phase bridge circuit to avoid burning out the single board, and meanwhile, the counter electromotive force discharging unit is started to discharge the counter electromotive force generated by the motor, actively consume the energy of the counter electromotive force of the motor and ensure the safety of the motor and the single board.
In the embodiment of the utility model, the back electromotive force discharging unit can comprise a circuit which is formed by a capacitor, a resistor and a combination of the capacitor and the resistor and can consume electric energy, and it can be understood that any back electromotive force discharging unit which can consume electric energy can realize the technical effects of discharging back electromotive force generated by the motor and actively consuming the energy of the back electromotive force of the motor.
In the embodiment of the utility model, the unidirectional conduction unit can be a diode, and can also be a circuit structure designed based on a diode, a thyristor, a field effect transistor or other electronic components for realizing unidirectional current conduction. The unidirectional conduction unit in the embodiment of the utility model is configured to be unidirectional conduction from the second end to the first end, namely, the unidirectional conduction from the second end to the first end is realized when the electromotive force of the second end is higher than that of the first end, and the unidirectional conduction unit is cut off when the electromotive force of the first end is higher than that of the second end, so that the electric connection between the three-phase bridge circuit and the bus is automatically cut off when the counter electromotive force is generated, the counter electromotive force cannot be transmitted to the bus through the three-phase bridge circuit, the influence on a later-stage circuit on the bus cannot be generated, and the single board is further protected. It can be understood that the unidirectional conduction unit in the embodiment of the utility model can also be an electric control switch for independent power supply or integral power supply, and when the counter electromotive force is detected to generate, the electric connection between the three-phase bridge circuit and the bus is cut off, so that the single board is protected.
In the embodiment of the utility model, the back electromotive force bleeder unit comprises a P-channel MOSFET field effect transistor and a bleeder resistor, wherein the grid electrode of the P-channel MOSFET field effect transistor is electrically connected with a bus, the source electrode of the P-channel MOSFET field effect transistor is electrically connected with a motor, the drain electrode of the P-channel MOSFET field effect transistor is electrically connected with the bleeder resistor, and the bleeder resistor is grounded.
When the motor generates back electromotive force, the source voltage of the P-channel MOSFET field effect transistor is increased, the P-channel MOSFET field effect transistor is conducted after the motor reaches the starting voltage, the back electromotive force discharges to the ground through the discharging resistor, the discharging of the back electromotive force is realized, after the discharging is finished, the source voltage of the P-channel MOSFET field effect transistor is reduced, the P-channel MOSFET field effect transistor is cut off, and the motor returns to normal operation. Therefore, the structure of the back electromotive force discharging unit enables the back electromotive force to be automatically switched to a normal working mode after the back electromotive force is discharged, and the motor is enabled to run more stably.
In the embodiment of the utility model, the resistance of the bleeder resistor is smaller than a preset resistance. According to the embodiment of the utility model, the bleeder power is improved by setting the smaller bleeder resistor resistance value, so that the bleeder speed is improved, and the influence time of back electromotive force on the motor work is reduced.
In the embodiment of the utility model, the starting voltage of the P-channel MOSFET is not more than the preset voltage, and the preset voltage can be set according to circuit parameters. The embodiment of the utility model can adjust the sensitivity of back electromotive force discharge by adjusting the starting voltage of the P-channel MOSFET field effect transistor, and the smaller the starting voltage is, the higher the sensitivity of back electromotive force detection and discharge is.
In the embodiment of the utility model, the unidirectional conduction unit is a diode, the cathode of the diode is electrically connected with the three-phase bridge circuit, and the anode of the diode is electrically connected with the bus. When the counter electromotive force is generated, the cathode voltage of the diode is larger than the anode voltage, and the diode is automatically cut off to prevent the counter electromotive force from being transmitted to the bus. According to the embodiment of the utility model, when the motor generates back electromotive force by arranging the diode, the motor can be cut off even if the motor is in a power-off state, so that the single board device can be stably protected from being damaged by the back electromotive force of the motor, the fixed and universal device model selection is realized, and the influence of the motor model and the voltage withstand value of the single board device is avoided.
The motor back electromotive force automatic bleeder circuit provided by the utility model has the advantages that the passive back electromotive force bleeder unit and the unidirectional conduction unit are arranged, so that when the motor generates back electromotive force, the back electromotive force bleeder unit is automatically conducted and the unidirectional conduction unit is automatically cut off, the back electromotive force is automatically bleeder, a single board device can be stably protected from being damaged by the back electromotive force of the motor, the fixed and universal device type selection is realized, the device is not influenced by the motor model and the withstand voltage value of the single board device, and meanwhile, the device can still bleed back electromotive force under the condition of power failure, and the single board is protected.
Fig. 2 is a schematic diagram of a U-phase motor control circuit of an automatic motor back electromotive force bleeder circuit according to an embodiment of the present utility model, where a V-phase motor control circuit and a W-phase motor control circuit according to an embodiment of the present utility model may be correspondingly configured according to the U-phase motor control circuit.
The U-phase motor control circuit comprises a high-level rectifying resistor R1, low-level rectifying resistors R2 and R7, N-channel MOSFET field effect transistors Q1 and Q2, a diode D1, a P-channel MOSFET field effect transistor Q10 and a pressure relief resistor R10, wherein the high-level rectifying resistor R1, the low-level rectifying resistors R2 and R7 and the N-channel MOSFET field effect transistors Q1 and Q2 jointly form a U-phase rectifying circuit and are used for supplying power to a U phase of the brushless direct current motor, the back electromotive force relief unit comprises a P-channel MOSFET field effect transistor Q10 and a relief resistor R10, the grid electrode of the P-channel MOSFET field effect transistor Q10 is electrically connected with a bus, the source electrode of the P-channel MOSFET field effect transistor Q is electrically connected with a U-phase power supply end of the motor, the drain electrode of the P-channel MOSFET field effect transistor Q10 is connected with the relief resistor R10, and the relief resistor R10 is grounded.
When the motor works normally, the cathode voltage of the diode D1 is smaller than the anode voltage, namely the diode D1 is conducted, the source voltage of the P-channel MOSFET field effect transistor Q10 is VM or 0, the grid voltage is VM, and the back electromotive force relief unit does not work;
When the motor generates counter electromotive force, the cathode voltage of the diode D1 is larger than the anode voltage, namely the diode D1 is automatically cut off, the source voltage of the P-channel MOSFET field effect transistor Q10 is increased, the P-channel MOSFET field effect transistor Q10 is conducted after the starting voltage is reached, the counter electromotive force discharges to the ground through the discharging resistor R10, the discharging of the counter electromotive force is realized, after the discharging is finished, the source voltage of the P-channel MOSFET field effect transistor Q10 is reduced, the P-channel MOSFET field effect transistor Q10 is cut off, and the motor returns to normal operation.
In the embodiment of the utility model, the back electromotive force discharging unit can be electrically connected with the power supply end of one phase of the motor and also can be electrically connected with the power supply ends of a plurality of phases of the motor, and it is understood that the power supply end of each phase of the motor is required to be electrically connected with at least one back electromotive force discharging unit so as to discharge back electromotive force through the back electromotive force discharging unit;
In the embodiment of the utility model, when the back electromotive force discharge unit is electrically connected with power supply ends of a plurality of phases of a motor, the back electromotive force discharge unit comprises a P-channel MOSFET field effect tube and a discharge resistor, wherein the grid electrode of the P-channel MOSFET field effect tube is electrically connected with a bus, the source electrode of the P-channel MOSFET field effect tube is electrically connected with power supply ends of a U phase, a V phase and a W phase of the motor, the drain electrode of the P-channel MOSFET field effect tube is electrically connected with the discharge resistor, the discharge resistor is grounded, and the back electromotive force generated by the U phase, the V phase and the W phase can be handled by using the P-channel MOSFET field effect tube and the discharge resistor to form the back electromotive force discharge unit at the moment, so that the hardware cost is saved.
In another preferred embodiment of the present utility model, the back emf relief unit comprises a U-phase back emf relief unit, a V-phase back emf relief unit, a W-phase back emf relief unit, when the back emf relief unit is correspondingly electrically connected to a supply terminal of one phase of the motor, wherein:
The U-phase counter electromotive force discharging unit is electrically connected with a U-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the U phase;
the V-phase counter electromotive force discharging unit is electrically connected with a V-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the V phase;
The W-phase counter electromotive force discharging unit is electrically connected with a W-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the W phase.
The U-phase counter electromotive force bleeder unit comprises a first P-channel MOSFET field effect tube and a first bleeder resistor, wherein the grid electrode of the first P-channel MOSFET field effect tube is electrically connected with a bus, the source electrode of the first P-channel MOSFET field effect tube is electrically connected with a U-phase power supply end of the motor, and the drain electrode of the first P-channel MOSFET field effect tube is electrically connected with the first bleeder resistor;
the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are grounded.
According to the embodiment of the utility model, different back electromotive force discharge units are arranged to correspond to different phase power supplies of the motors one by one, so that the power supply phase of each motor corresponds to an independent back electromotive force discharge unit, and the work of other phases is not influenced when any phase generates back electromotive force.
In the embodiment of the utility model, the resistance values of the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are the same, and the resistance values of the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are smaller than a preset resistance value. The embodiment of the utility model symmetrically arranges the back electromotive force discharge units of each phase of the motor, so that the motor can stably run.
In the embodiment of the utility model, the unidirectional conduction unit comprises a U-phase unidirectional conduction unit, a V-phase unidirectional conduction unit and a W-phase unidirectional conduction unit, wherein the first end of the U-phase unidirectional conduction unit is electrically connected with a U-phase power supply circuit of a three-phase bridge circuit, the first end of the V-phase unidirectional conduction unit is electrically connected with a V-phase power supply circuit of the three-phase bridge circuit, the first end of the W-phase unidirectional conduction unit is electrically connected with a W-phase power supply circuit of the three-phase bridge circuit, and the second ends of the U-phase unidirectional conduction unit, the V-phase unidirectional conduction unit and the W-phase unidirectional conduction unit are electrically connected with a bus.
According to the embodiment of the utility model, different unidirectional conduction units are arranged to correspond to different phase power supplies of the motors one by one, so that the power supply phase of each motor corresponds to an independent unidirectional conduction unit, the power supply of other phases is not influenced when the unidirectional conduction unit of any phase is cut off, and the motors can run stably.
Therefore, the motor counter electromotive force automatic discharging circuit provided by the utility model has the advantages that the passive counter electromotive force discharging unit and the unidirectional conducting unit are arranged, so that when the motor generates counter electromotive force, the counter electromotive force discharging unit is automatically conducted and the unidirectional conducting unit is automatically cut off, the automatic discharging of the counter electromotive force is realized, a single board device can be stably protected from being damaged by the counter electromotive force of the motor, the fixed and universal device selection is realized, the effect of the motor model and the withstand voltage value of the single board device is avoided, and meanwhile, the equipment can still discharge the counter electromotive force under the condition of power failure, and the single board is protected.
The utility model also provides a pendulum type speed pass gate, which comprises a motor and a motor control circuit, wherein the motor control circuit comprises the motor back electromotive force automatic bleeder circuit provided by the embodiment of the utility model.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present utility model.
Claims (10)
1. An automatic motor back emf bleeder circuit comprising:
Three-phase bridge circuit, back electromotive force relief unit and one-way conduction unit, wherein:
The three-phase bridge circuit is electrically connected with the motor and is used for supplying power to the motor;
The back electromotive force discharging unit is electrically connected with the motor and used for discharging back electromotive force generated by the motor;
The unidirectional conduction unit comprises a first end and a second end, wherein the first end of the unidirectional conduction unit is electrically connected with the three-phase bridge circuit, and the second end of the unidirectional conduction unit is electrically connected with the bus and used for cutting off the electrical connection between the three-phase bridge circuit and the bus when the motor generates counter electromotive force.
2. The automatic back electromotive force bleeding circuit of a motor according to claim 1, wherein the back electromotive force bleeding unit comprises a P-channel type MOSFET field effect transistor and a bleeding resistor, wherein a grid electrode of the P-channel type MOSFET field effect transistor is electrically connected with a bus, a source electrode of the P-channel type MOSFET field effect transistor is electrically connected with U-phase, V-phase and W-phase power supply ends of the motor, a drain electrode of the P-channel type MOSFET field effect transistor is electrically connected with the bleeding resistor, and the bleeding resistor is grounded.
3. The automatic motor back emf bleeder circuit according to claim 2, wherein the turn-on voltage of the P-channel MOSFET field effect transistor is no greater than a predetermined voltage.
4. The automatic motor back emf bleeder circuit of claim 2, wherein the bleeder resistor has a resistance less than a predetermined resistance.
5. The automatic back electromotive force bleeding circuit of a motor according to claim 1, wherein the unidirectional conducting unit is a diode, a cathode of the diode is electrically connected with the three-phase bridge circuit, and an anode of the diode is electrically connected with the bus bar.
6. The motor back emf automatic bleed circuit of claim 1 wherein said back emf bleed unit comprises a U-phase back emf bleed unit, a V-phase back emf bleed unit, a W-phase back emf bleed unit, wherein:
The U-phase counter electromotive force discharging unit is electrically connected with a U-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the U phase;
the V-phase counter electromotive force discharging unit is electrically connected with a V-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the V phase;
The W-phase counter electromotive force discharging unit is electrically connected with a W-phase power supply end of the motor and is used for discharging counter electromotive force generated by the motor in the W phase.
7. The automatic motor back electromotive force bleeder circuit according to claim 6, wherein the U-phase back electromotive force bleeder unit comprises a first P-channel MOSFET field effect transistor and a first bleeder resistor, wherein the grid electrode of the first P-channel MOSFET field effect transistor is electrically connected with a bus, the source electrode of the first P-channel MOSFET field effect transistor is electrically connected with a U-phase power supply end of the motor, the drain electrode of the first P-channel MOSFET field effect transistor is electrically connected with the first bleeder resistor, the grid electrode of the second P-channel MOSFET field effect transistor is electrically connected with the bus, the source electrode of the second P-channel MOSFET field effect transistor is electrically connected with a V-phase power supply end of the motor, the drain electrode of the second P-channel MOSFET field effect transistor is electrically connected with the second bleeder resistor, the W-phase back electromotive force bleeder unit comprises a third P-channel MOSFET field effect transistor and a third bleeder resistor, the grid electrode of the third P-channel MOSFET field effect transistor is electrically connected with the bus, and the source electrode of the third P-channel MOSFET field effect transistor is electrically connected with a W-phase power supply end of the motor, and the drain electrode of the third bleeder resistor is electrically connected with the third bleeder resistor;
the first bleeder resistor, the second bleeder resistor and the third bleeder resistor are grounded.
8. The automatic motor back electromotive force bleeding circuit of claim 7, wherein the first bleeding resistor, the second bleeding resistor and the third bleeding resistor have the same resistance, and the turn-on voltage of the first P-channel MOSFET field effect transistor, the second P-channel MOSFET field effect transistor and the third P-channel MOSFET field effect transistor is not greater than a preset voltage.
9. The automatic motor back electromotive force discharging circuit according to claim 6, wherein the unidirectional conducting unit comprises a U-phase unidirectional conducting unit, a V-phase unidirectional conducting unit and a W-phase unidirectional conducting unit, a first end of the U-phase unidirectional conducting unit is electrically connected with a U-phase power supply circuit of the three-phase bridge circuit, a first end of the V-phase unidirectional conducting unit is electrically connected with a V-phase power supply circuit of the three-phase bridge circuit, a first end of the W-phase unidirectional conducting unit is electrically connected with a W-phase power supply circuit of the three-phase bridge circuit, and a second end of the U-phase unidirectional conducting unit, the V-phase unidirectional conducting unit and the W-phase unidirectional conducting unit are all electrically connected with a bus.
10. A pendulum type speed gate comprising a motor and a motor control circuit, said motor control circuit comprising an automatic motor back emf bleeder circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420972698.2U CN222508781U (en) | 2024-05-07 | 2024-05-07 | Automatic discharge circuit of motor back electromotive force and swing-type speed gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420972698.2U CN222508781U (en) | 2024-05-07 | 2024-05-07 | Automatic discharge circuit of motor back electromotive force and swing-type speed gate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222508781U true CN222508781U (en) | 2025-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420972698.2U Active CN222508781U (en) | 2024-05-07 | 2024-05-07 | Automatic discharge circuit of motor back electromotive force and swing-type speed gate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222508781U (en) |
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2024
- 2024-05-07 CN CN202420972698.2U patent/CN222508781U/en active Active
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