Search

CN-224216770-U - Load power supply circuit, motor controller and power supply control module

CN224216770UCN 224216770 UCN224216770 UCN 224216770UCN-224216770-U

Abstract

The application discloses a load power supply circuit, a motor controller and a power supply control module, and relates to the technical field of power supply, wherein the circuit comprises a switching device, a voltage sampling circuit and a judging circuit; A voltage sampling circuit is arranged between a switching device connected with the negative electrode of a load power supply and a first load interface for connecting an external load so as to collect interface voltage at the first load interface and generate a corresponding voltage sampling signal. The voltage sampling signal and the control signal of the switching device are output to the judgment circuit. The judging circuit confirms whether the interface voltage and the voltage value of the control signal are matched with the corresponding conditions when the switching device is turned on or turned off according to the voltage value corresponding to the voltage sampling signal and the voltage value of the control signal, so that effective judgment on whether the switching device fails can be still completed under the condition that a load is not connected, a failure source can be conveniently and rapidly detected when the circuit fails, and the failure processing efficiency is improved.

Inventors

  • ZHAO YUNHE
  • GUO BINGRONG

Assignees

  • 苏州汇川控制技术有限公司

Dates

Publication Date
20260508
Application Date
20250508

Claims (11)

  1. 1. The load power supply circuit is characterized by comprising a voltage sampling circuit, a switching device and a judging circuit; The input end of the voltage sampling circuit is connected with a first load interface and the first end of the switching device, and the output end of the voltage sampling circuit is connected with the first input end of the judging circuit; the voltage sampling circuit is used for collecting the interface voltage at the first load interface and outputting a corresponding voltage sampling signal to the judging circuit; The second end of the switching device is connected with the negative electrode of the load power supply, and the second load interface is connected with the positive electrode of the load power supply; The judging circuit is used for judging whether the switching device is faulty or not based on the control signal of the switching device and the voltage sampling signal.
  2. 2. The load supply circuit of claim 1, wherein the voltage sampling circuit comprises an optocoupler device and a first resistor; the primary side anode of the optocoupler is connected with a first power supply, the primary side cathode of the optocoupler is connected with the first load interface, the secondary side first pole of the optocoupler is connected with the second end of the first resistor and the external load of the first input end of the judging circuit, the secondary side second pole of the optocoupler is grounded, and the first end of the first resistor is connected with a second power supply.
  3. 3. The load supply circuit of claim 2, wherein the load supply circuit further comprises a unidirectional conduction circuit; The input end of the unidirectional conduction circuit is connected with the first power supply, and the output end of the unidirectional conduction circuit is connected with the primary side anode of the optocoupler device; The unidirectional conduction circuit is used for preventing the interface voltage from flowing backwards to the first power supply.
  4. 4. The load supply circuit of claim 3, wherein the unidirectional conduction circuit comprises a first diode; the anode of the first diode is connected with the first power supply, and the cathode of the first diode is connected with the primary side anode of the optocoupler.
  5. 5. The load supply circuit of claim 2, wherein the load supply circuit further comprises a first current limiting circuit; The first end of the first current limiting circuit is connected with the first power supply, and the second end of the first current limiting circuit is connected with the primary side anode of the optocoupler device; The first current limiting circuit is used for limiting the current output to the voltage sampling circuit not to exceed a first current threshold value.
  6. 6. The load supply circuit of claim 5, wherein the first current limiting circuit comprises a second resistor; and the first end of the second resistor is connected with the first power supply, and the second end of the second resistor is connected with the primary side anode of the optocoupler device.
  7. 7. The load supply circuit of claim 1, wherein the load supply circuit further comprises a second diode; the positive electrode of the second diode is connected with the first load interface, and the positive electrode of the second diode is connected with the second load interface.
  8. 8. The load supply circuit of claim 1, wherein the load supply circuit further comprises a third resistor; And the first end of the third resistor is connected with the negative electrode of the load power supply, and the second end of the third resistor is connected with the second end of the switching device.
  9. 9. The load supply circuit of claim 8, wherein the load supply circuit further comprises a current sampling circuit; The first input end of the current sampling circuit is connected with the first end of the third resistor, the second input end of the current sampling circuit is connected with the second end of the third resistor, and the output end of the current sampling circuit is connected with the second input end of the judging circuit; The current sampling circuit is used for collecting the current flowing through the third resistor and outputting a corresponding current sampling signal to the judging circuit; The judging circuit is further used for judging whether the external load is faulty or not based on the current sampling signal.
  10. 10. A motor controller comprising a load supply circuit as claimed in any one of claims 1 to 9.
  11. 11. A power control module comprising a load supply circuit as claimed in any one of claims 1 to 9.

Description

Load power supply circuit, motor controller and power supply control module Technical Field The present application relates to the field of power supply technologies, and in particular, to a load power supply circuit, a motor controller, and a power control module. Background In the prior art, for some high-power electric machines or electric automobiles, an internal electric accessory switch is indispensable for ensuring the internal electric safety of the electric machines or electric automobiles. Correspondingly, state detection of the electric accessory switch is also important, and current methods are generally adopted for state detection of the existing electric accessory switch. However, the current method requires sampling the current through the shunt to determine whether the entire circuit constituted by the electric accessory switch and the external load is faulty or not, and cannot determine whether the internal switching device is faulty or the external load is faulty in particular. The voltage rule requires a large number of hardware structures to be additionally added, and the cost is high. Disclosure of utility model The application mainly aims to provide a load power supply circuit, a motor controller and a power supply control module, and aims to solve the technical problem of judging whether a switching device fails or not when an external load is not connected. In order to achieve the above object, an embodiment of the present application provides a load power supply circuit, which includes a voltage sampling circuit, a switching device, and a judging circuit; The input end of the voltage sampling circuit is connected with a first load interface and the first end of the switching device, and the output end of the voltage sampling circuit is connected with the first input end of the judging circuit; the voltage sampling circuit is used for collecting the interface voltage at the first load interface and outputting a corresponding voltage sampling signal to the judging circuit; The second end of the switching device is connected with the negative electrode of the load power supply, and the second load interface is connected with the positive electrode of the load power supply; The judging circuit is used for judging whether the switching device is faulty or not based on the control signal of the switching device and the voltage sampling signal. In one embodiment, the voltage sampling circuit comprises an optocoupler device and a first resistor; the primary side anode of the optocoupler is connected with a first power supply, the primary side cathode of the optocoupler is connected with the first load interface, the secondary side first pole of the optocoupler is connected with the second end of the first resistor and the external load of the first input end of the judging circuit, the secondary side second pole of the optocoupler is grounded, and the first end of the first resistor is connected with a second power supply. In one embodiment, the load power supply circuit further comprises a unidirectional conduction circuit; The input end of the unidirectional conduction circuit is connected with the first power supply, and the output end of the unidirectional conduction circuit is connected with the primary side anode of the optocoupler device; The unidirectional conduction circuit is used for preventing the interface voltage from flowing backwards to the first power supply. In one embodiment, the unidirectional conduction circuit comprises a first diode; the anode of the first diode is connected with the first power supply, and the cathode of the first diode is connected with the primary side anode of the optocoupler. In one embodiment, the load supply circuit further comprises a first current limiting circuit; The first end of the first current limiting circuit is connected with the first power supply, and the second end of the first current limiting circuit is connected with the primary side anode of the optocoupler device; The first current limiting circuit is used for limiting the current output to the voltage sampling circuit not to exceed a first current threshold value. In one embodiment, the first current limiting circuit comprises a second resistor; and the first end of the second resistor is connected with the first power supply, and the second end of the second resistor is connected with the primary side anode of the optocoupler device. In one embodiment, the load supply circuit further comprises a second diode; the positive electrode of the second diode is connected with the first load interface, and the positive electrode of the second diode is connected with the second load interface. In one embodiment, the load supply circuit further comprises a third resistor; And the first end of the third resistor is connected with the negative electrode of the load power supply, and the second end of the third resistor is connected with the second end of the switching device. In one emb