# US 2019/0356240 A1 · Brake drive circuit

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- Number: US 2019/0356240 A1
- Document ID: US20190356240A1
- Status: Published application
- Kind: A1
- Application number: 16/525,155
- Filed: 2019-07-29
- Published: 2019-11-21
- Earliest claimed: 2017-02-03
- Assignees: Sumitomo Heavy Industries, Ltd.
- Applicants: Sumitomo Heavy Industries, Ltd.
- Inventors: Tomohiro Oki
- Web page: https://patentgrep.com/patent/US20190356240A1

## CPC

- H02M 7/5387: in a bridge configuration
- F16D 65/16: arranged in or on the brake
- H02M 7/48: using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M 7/4826: {operating from a resonant DC source, i.e. the DC input voltage varies periodically, e.g. resonant DC-link inverters}
- H02P 3/04: Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake
- H02P 15/00: Arrangements for controlling dynamo-electric brakes or clutches (vector control H02P21/00)
- H02P 27/08: with pulse width modulation
- 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)
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A drive circuit for an electromagnetic brake is used in a circuit including a motor, a converter converting a DC voltage into an AC voltage to be generated between a pair of DC link buses, and an inverter converting the DC voltage into an AC voltage and driving the motor. A full-bridge circuit has a pair of power supply terminals connected to the pair of DC link buses, and a pair of output terminals connected to the electromagnetic brake.

## Claims

### Claim 1

A drive circuit for an electromagnetic brake used in a circuit including a motor, a converter converting an AC voltage into a DC voltage to be generated between a pair of DC link buses, and an inverter converting the DC voltage into an AC voltage and driving the motor, the drive circuit comprising:
a full-bridge circuit that has a pair of power supply terminals connected to the pair of DC link buses, and a pair of output terminals connected to the electromagnetic brake.

### Claim 2 (depends on 1)

The drive circuit according to claim 1,
wherein the full-bridge circuit includes a first transistor pair including two transistors provided diagonally and a second transistor pair including two transistors provided diagonally.

### Claim 3 (depends on 1)

The drive circuit according to claim 1,
wherein the full-bridge circuit includes a first transistor pair including two transistors provided diagonally and a diode pair including two diodes provided diagonally.

### Claim 4 (depends on 2)

The drive circuit according to claim 2,
wherein, in a releasing state of the electromagnetic brake, a duty ratio of switching of the first transistor pair is adjustable depending on a voltage to be applied to the electromagnetic brake.

### Claim 5 (depends on 2)

The drive circuit according to claim 2,
wherein, in an overexcitation period after starting, the first transistor pair (i) is fixed to an ON state or (ii) performs switching at a duty ratio higher than a duty ratio of switching of the first transistor pair in a releasing period after the overexcitation period.

### Claim 6 (depends on 2)

The drive circuit according to claim 2,
wherein, in a braking period, the second transistor pair of the full-bridge circuit is fixed to an ON state.

### Claim 7 (depends on 2)

The drive circuit according to claim 2,
wherein, in a braking period, at least one of the two transistors of the second transistor pair of the full-bridge circuit performs switching.