# US 12,224,695 B2 · Motor control device for achieving safe and efficient braking and motor braking method thereof

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- Number: US 12,224,695 B2
- Document ID: US12224695B2
- Status: Granted
- Kind: B2
- Application number: 18/123,340
- Filed: 2023-03-20
- Published: 2024-06-27
- Granted: 2025-02-11
- Earliest claimed: 2022-12-22
- Assignees: Weltrend Semiconductor Inc.
- Applicants: Weltrend Semiconductor Inc.
- Inventors: Chien-Tsung Hung; Yu-Kai Wong; Meng-Che Tsai
- Web page: https://patentgrep.com/patent/US12224695B2

## CPC

- H02P 3/18: for stopping or slowing an AC motor
- H02P 3/22: by short-circuit or resistive braking
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A motor is coupled to a motor control device including a set of high-side switches, a set of low-side switches, a capacitor and a controller. The set of high-side switches and the set of low-side switches are coupled to the motor. The capacitor is coupled to the set of high-side switches. The controller is coupled to the capacitor, the set of high-side switches and the set of low-side switches. A method of braking the motor includes upon the motor being disconnected from an external power source, the controller receiving a supply voltage from the capacitor, turning on the set of low-side switches, turning off the set of high-side switches, and the controller switching the set of low-side switches according to the supply voltage.

## Claims

### Claim 1

A method for braking a motor, the motor being coupled to a motor control device, the motor control device comprising a set of high-side switches, a set of low-side switches, a capacitor and a controller, the set of high-side switches and the set of low-side switches being coupled to the motor, the capacitor being coupled to the set of high-side switches, the controller being coupled to the capacitor, the set of high-side switches and the set of low-side switches, the method comprising:
after the motor is disconnected from an external power supply, the controller receiving a supply voltage from the capacitor, turning on the set of low-side switches, and turning off the set of high-side switches;
determining whether the supply voltage is less than a first target voltage; and
if the supply voltage is less than the first voltage, the controller turning off the set of low-side switches and turning off the set of high-side switches.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
the controller determining whether the supply voltage exceeds a second target voltage, the second target voltage being larger than the first target voltage; and
if the supply voltage exceeds the second target voltage, the controller turning on the set of low-side switches and turning off the set of high-side switches.

### Claim 3 (depends on 2)

The method of claim 2, wherein the second target voltage is less than a damage voltage of the controller, the set of high-side switches, or the set of low-side switches.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first target voltage is between a rated voltage of the motor and a turn-off voltage of the controller.

### Claim 5

A motor control device for braking a motor, the motor control device comprising:
a set of high-side switches coupled to the motor;
a set of low-side switches coupled to the motor;
a capacitor coupled to the set of high-side switches; and
a controller coupled to the capacitor, the set of high-side switches, and the set of low-side switches, configured to receive a supply voltage from the capacitor after the motor is disconnected from an external power source, turn on the set of low-side switches, turn off the set of high-side switches, determine whether the supply voltage is less than a first target voltage, and if the supply voltage is less than the first target voltage, turn off the set of low-side switches and turn off the set of high-side switches.

### Claim 6 (depends on 5)

The motor control device of claim 5, wherein:
the controller is further configured to determine whether the supply voltage exceeds a second target voltage, and turn off the set of low-side switches and turn off the set of high-side switches if the supply voltage is less than the first target voltage; and
the second target voltage is larger than the first target voltage.

### Claim 7 (depends on 6)

The motor control device of claim 6, wherein the second target voltage is less than a damage voltage of the controller, the set of high-side switches, or the set of low-side switches.

### Claim 8 (depends on 5)

The motor control device of claim 5, wherein the first target voltage is between a rated voltage of the motor and a turn-off voltage of the controller.

### Claim 9 (depends on 5)

The motor control device of claim 5, wherein the set of high-side switches comprises 3 transistors, and the set of low-side switches comprises 3 transistors.