# US 11,444,528 B2 · Motor controller electrical-discharge control circuit

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- Number: US 11,444,528 B2
- Document ID: US11444528B2
- Status: Granted
- Kind: B2
- Application number: 17/042,902
- Filed: 2019-03-13
- Published: 2021-02-25
- Granted: 2022-09-13
- Earliest claimed: 2018-04-02
- Assignees: Jing-Jin Electric Technologies Co., Ltd.
- Applicants: Jing-Jin Electric Technologies Co., Ltd
- Inventors: Yuxia Qu; Hao Zhang; Ying Wang
- Web page: https://patentgrep.com/patent/US11444528B2

## CPC

- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M 1/322: {Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock}
- 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 (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

The present disclosure discloses a discharge controlling circuit of an electric-motor controller, wherein the discharge controlling circuit includes a discharging-signal transmitting circuit, a switch circuit and a discharging circuit; the switch circuit is connected respectively to the discharging-signal transmitting circuit and the discharging circuit; the discharging circuit is connected to an anode of a busbar; an input end of the discharging-signal transmitting circuit is connected to a discharging-signal outputting pin of the electric-motor controller, and an output end of the discharging-signal transmitting circuit is connected to a cathode of the busbar; the discharging-signal transmitting circuit is configured to output a controlling signal to the switch circuit according to a received discharging signal; and the switch circuit is connected to the anode of the busbar, the cathode of the busbar and the output end of the discharging-signal transmitting circuit, and is configured to be turned on according to the received controlling signal and discharge via the discharging circuit. The discharge controlling circuit of an electric-motor controller of the present embodiment can realize active quick discharging, which prevents the risk of high-voltage leakage, and guarantees the safety of the electric-motor controller.

## Claims

### Claim 1

A discharge controlling circuit of an electric-motor controller, wherein the discharge controlling circuit comprises: a discharging-signal transmitting circuit, a switch circuit and a discharging circuit, wherein:
the switch circuit is connected respectively to the discharging-signal transmitting circuit and the discharging circuit;
the discharging circuit is connected to an anode of a busbar;
an input end of the discharging-signal transmitting circuit is connected to a discharging-signal outputting pin of the electric-motor controller, and an output end of the discharging-signal transmitting circuit is connected to a cathode of the busbar;
the discharging-signal transmitting circuit is configured to output a controlling signal to the switch circuit according to a received discharging signal;
the switch circuit is connected to the anode of the busbar, the cathode of the busbar and the output end of the discharging-signal transmitting circuit, and is configured to be turned on according to the received controlling signal and discharge via the discharging circuit; and
the discharging circuit comprises a plurality of discharging resistors in series, and a quantity of the discharging resistors and resistance values of the discharging resistors are designed according to discharge time and powers of the discharging resistors,
wherein the discharging-signal transmitting circuit comprises: an optical coupler and a filter circuit,
wherein:
the filter circuit comprises a first filter capacitor, a filter resistor and a second filter capacitor;
an input anode pin of the optical coupler is connected to the discharging-signal outputting pin, and the discharging-signal outputting pin is connected to the electric-motor controller;
an input cathode pin of the optical coupler is grounded;
a signal outputting cathode of the optical coupler is connected to one end of the first filter capacitor and connected to the cathode of the busbar;
a signal outputting anode of the optical coupler is connected to the other end of the first filter capacitor and one end of the filter resistor, and the other end of the filter resistor is connected to one end of the second filter capacitor and a controlling end of the switch circuit; and
the other end of the second filter capacitor is connected to the cathode of the busbar,
wherein:
the switch circuit comprises: a triode, an MOS transistor, and a first divider resistor, a second divider resistor, a third divider resistor, a fourth divider resistor, a fifth divider resistor, a sixth divider resistor, a seventh divider resistor, an eighth divider resistor, a ninth divider resistor, a tenth divider resistor and an eleventh divider resistor that are sequentially connected in series;
a base of the triode is connected to the signal outputting anode of the optical coupler;
an emitter of the triode is connected to one end of the tenth divider resistor, one end of the eleventh divider resistor and a grid of the MOS transistor;
a collector of the triode is firstly connected to the other end of the eleventh divider resistor and then connected to the cathode of the busbar; and
a source of the MOS transistor is connected to the cathode of the busbar, and a drain of the MOS transistor is connected to the discharging circuit,
wherein:
the switch circuit further comprises: a third capacitor and a diode;
one end of the third capacitor is connected to one end of the eleventh divider resistor and the emitter of the triode;
the other end of the third capacitor is connected to the other end of the eleventh divider resistor and the collector of the triode;
a cathode of the diode is connected to one end of the eleventh divider resistor and the grid of the MOS transistor; and
an anode of the diode is firstly connected to the other end of the eleventh divider resistor and the source of the MOS transistor and then connected to the cathode of the busbar, and
wherein:
the discharging circuit comprises: a first discharging resistor, a second discharging resistor, a third discharging resistor and a fourth discharging resistor that are connected in series;
one end of the third discharging resistor is connected to the drain of the MOS transistor; and
the other end of the third discharging resistor is connected to the anode of the busbar.

### Claim 2 (depends on 1)

The discharge controlling circuit of an electric-motor controller according to claim 1, wherein the resistance value of each of the first discharging resistor, the second discharging resistor, the third discharging resistor and the fourth discharging resistor is 110Ω.

### Claim 3 (depends on 1)

The discharge controlling circuit of an electric-motor controller according to claim 1, wherein a model of the optical coupler is: ACPL-K30T-000E.