Brake control system of motor

Patent metadata

Field	Value
Publication number	US-11736044-B2
Application number	US-202217669495-A
Country	US
Kind code	B2
Filing date	Feb 11, 2022
Priority date	Dec 17, 2021
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A brake control system of a motor is provided. When a control circuit intends to brake the motor, the control circuit controls a driver circuit to turn off a first high-side switch and a second high-side switch, and to fully turn on the first low-side switch and the second low-side switch, for a period of time. Then, the control circuit controls the driver circuit to turn off one of the first low-side switch and the second low-side switch, and to continually turn on the other one of the first low-side switch and the second low-side switch, for a period of time. Then, the control circuit controls the driver circuit to turn off the other one of the first low-side switch and the second low-side switch, and to turn on the one of the first low-side switch and the second low-side switch, for a period of time.

First claim

What is claimed is:

1. A braking controller system of a motor, comprising:
a first high-side switch, wherein a first terminal of the first high-side switch is coupled to an input voltage;
a first low-side switch, wherein a first terminal of the first low-side switch is connected to a second terminal of the first high-side switch, a second terminal of the first low-side switch is grounded, and a node between the first terminal of the first low-side switch and the second terminal of the first high-side switch is connected to a first terminal of the motor;
a second high-side switch, wherein a first terminal of the second high-side switch is coupled to the input voltage;
a second low-side switch, wherein a first terminal of the second low-side switch is connected to a second terminal of the high-side switch, a second terminal of the second low-side switch is grounded, and a node between the first terminal of the second low-side switch and the second terminal of the second high-side switch is connected to a second terminal of the motor;
a driver circuit connected to a control terminal of the first high-side switch, a control terminal of the first low-side switch, a control terminal of the second high-side switch and a control terminal of the second low-side switch; and
a control circuit connected to the driver circuit, and configured to control the driver circuit to sequentially execute a brake deceleration operation and a first braking rest operation when the control circuit intends to brake the motor;
wherein, in the brake deceleration operation, the control circuit controls the driver circuit to turn off the first high-side switch and the second high-side switch and to fully turn on the first low-side switch and the second low-side switch, or the control circuit controls the driver circuit to turn on the first high-side switch and the second high-side switch and to turn off the first low-side switch and the second low-side switch;
wherein, in the first braking rest operation, the control circuit controls the driver circuit to turn off the first high-side switch and the second high-side switch, to turn off one of the first low-side switch and the second low-side switch, and to fully turn on the other one of the first low-side switch and the second low-side switch.

2. The braking controller system according to claim 1 , wherein the control circuit controls the driver circuit to sequentially execute the brake deceleration operation, the first braking rest operation and a second braking rest operation;
wherein, in the second braking rest operation, the control circuit controls the driver circuit to turn off the first high-side switch and the second high-side switch, to turn off the other one of the first low-side switch and the second low-side switch, and to fully turn on the one of the first low-side switch and the second low-side switch.

3. The braking controller system according to claim 2 , wherein the control circuit controls the driver circuit to sequentially execute the brake deceleration operation, the first braking rest operation and the second braking rest operation multiple times until a rotational speed of the motor is decreased to reach a target rotational speed.

4. The braking controller system according to claim 3 , wherein, when the control circuit determines that the rotational speed of the motor is decreased to be lower than a speed threshold, the control circuit controls the driver circuit to stop executing the first braking rest operation and the second braking rest operation, and then to start executing the brake deceleration operation until the rotational speed of the motor is decreased to reach the target rotational speed.

5. The braking controller system according to claim 2 , wherein the control circuit controls the driver circuit to execute a plurality of brake loop operations;
wherein, in each of the brake loop operations, the control circuit controls the driver circuit to execute the brake deceleration operation once, and then to sequentially execute the first braking rest operation and the second braking rest operation once or multiple times.

6. The braking controller system according to claim 2 , further comprising:
a Hall sensor connected to the control circuit and configured to sense a positive voltage and a negative voltage that are generated with a change in magnetic field strength from rotation of a rotor of the motor to output a Hall signal, wherein the control circuit controls the driver circuit based on the Hall signal.

7. The braking controller system according to claim 6 , wherein, when a current time reaches one of transition time points of the Hall signal, the driver circuit starts executing the brake deceleration operation;
wherein, when the current time reaches a next one of the transition time points of the Hall signal, the driver circuit stops executing the brake deceleration operation and starts executing the first braking rest operation;
wherein, when the current time reaches a further next one of the transition time points of the Hall signal, the driver circuit stops executing the first braking rest operation and starts executing the second braking rest operation.

8. The braking controller system according to claim 7 , wherein the one of the transition time points, the next one of the transition time points and the further next one of the transition time points are time points of rising edges or falling edges of waves of the Hall signal.

9. The braking controller system according to claim 6 , wherein, when the control circuit determines that the Hall signal reaches a first level, the control circuit controls the driver circuit to turn off the first high-side switch and the second high-side switch, to fully turn on the first low-side switch, and to turn off the second low-side switch;
wherein, when the control circuit determines that the Hall signal reaches a second level that is different from the first level, the control circuit controls the driver circuit to turn off the first high-side switch and the second high-side switch, to fully turn on the second low-side switch, and to turn off the first low-side switch.

Assignees

• Anpec Electronics Corp

Inventors

• Jiang Jyun-Ping
• Chien Shih-Hai

Classifications

• H02P6/085 Primary

  in a bridge configuration · CPC title

• H02P6/24 Primary

  Arrangements for stopping · CPC title

• H02P3/20 Primary

  by reversal of phase sequence of connections to the motor · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• H02P3/22

  by short-circuit or resistive braking · CPC title