# US 9,438,142 B2 · Motor driving circuit

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- Number: US 9,438,142 B2
- Document ID: US9438142B2
- Status: Granted
- Kind: B2
- Application number: 14/414,978
- Filed: 2013-07-23
- Published: 2015-08-06
- Granted: 2016-09-06
- Earliest claimed: 2012-07-23
- Assignees: Meidensha Corporation
- Applicants: Meidensha Corporation
- Inventors: Tetsuji Suzuki
- Web page: https://patentgrep.com/patent/US9438142B2

## CPC

- B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors}
- H02H 11/002: {in case of inverted polarity or connection; with switching for obtaining correct connection}
- H02P 3/14: by regenerative braking
- H02P 29/02: Providing protection against overload without automatic interruption of supply (protection against faults of stepper motors H02P8/36)
- H02P 29/027: {the fault being an over-current}
- H02J 7/855: {with circuits adapted for supplying loads from the battery}
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 7/797: using semiconductor devices only
- Y02T 10/64: Electric machine technologies in electromobility
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A main control circuit (11) for driving a motor is configured so as to have: a Pch FET (T11), which is provided in series with a diode (D1), and the source (S) of which is connected to a secondary-side contact (MC2) of a main contactor (MC) while the drain (D) is connected to the anode (A) of the diode (D1); and a gate voltage generation circuit (12) for the Pch FET (T11). The gate voltage generation circuit is formed so as to have a first resistor (R11), one end (R11a) of which is connected to the source (S) of the Pch FET (T11), and the other end (R11b) of which is connected to the gate (G) of the Pch FET (T11), and a second resistor (R12), one end (R12a) of which is connected to the gate (G) of the Pch FET (T11) and the other end (R12b) of which is connected to the negative-electrode-side line (L2) of a battery.

## Claims

### Claim 1

A motor driving circuit including
a battery,
a contactor,
a motor control circuit section to which a motor is connected and which is any one of an H-bridge circuit and a three-phase bridge circuit including a plurality of switching elements including backward diodes,
a battery-positive-electrode-side line connecting a positive electrode terminal of the battery and a battery-positive-electrode-side terminal of the motor control circuit section to each other through the contactor,
a battery-negative-electrode-side line connecting a negative electrode terminal of the battery and a battery-negative-electrode-side terminal of the motor control circuit section to each other, and
a diode provided in parallel with the contactor, and connected at a cathode thereof to a primary-side contact of the contactor, characterized in that the motor driving circuit comprises:
a Pch FET provided in series with the diode, and connected at a source thereof to a secondary-side contact of the contactor and connected at a drain thereof to an anode of the diode; and
a gate voltage generation circuit for the Pch FET, the gate voltage generation circuit including
a first resistor connected at one end thereof to a source of the Pch FET and connected at another end thereof to a gate of the Pch FET, and
a second resistor connected at one end thereof to the gate of the Pch FET and connected at another end thereof to the battery-negative-electrode-side line.

### Claim 2 (depends on 1)

The motor driving circuit according to claim 1, characterized in that the gate voltage generation circuit includes a capacitor provided in parallel with the first resistor, and connected at one end thereof to the source of the Pch FET and connected at another end thereof to the gate of the Pch FET.

### Claim 3 (depends on 1)

The motor driving circuit according to claim 1, characterized in that the gate voltage generation circuit includes a Zener diode provided in parallel with the first resistor, and connected at a cathode thereof to the source of the Pch FET and connected at an anode thereof to the gate of the Pch FET.

### Claim 4 (depends on 2)

The motor driving circuit according to claim 2, characterized in that the gate voltage generation circuit includes a Zener diode provided in parallel with the first resistor, and connected at a cathode thereof to the source of the Pch FET and connected at an anode thereof to the gate of the Pch FET.