Efficient regenerative electrical braking

Patent metadata

Field	Value
Publication number	US-11142075-B2
Application number	US-201916594153-A
Country	US
Kind code	B2
Filing date	Oct 7, 2019
Priority date	Aug 8, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

Provided are embodiments for a braking system, where the system includes a controller, a motor coupled to an H-bridge network, a DC link coupled to the motor, and an electrical braking system electrically coupled to the motor. The electrical braking system includes a sense circuit configured to sense a condition of the DC link, a brake resistor coupled to the DC link, a drive circuit coupled to the sense circuit, and a transformer for regeneration. Also, provided are embodiments of a method for operating an efficient regenerative resonance electrical braking system.

First claim

The invention claimed is:

1. A method comprising,
operating an electrical braking system in at least one mode;
sensing a condition of the electrical braking system;
performing braking based at least in part on the at least one mode and the sensed condition;
coupling a transform to each phase of a motor; and
performing braking for each phase based at least in part on the at least one mode and the sensed condition.

2. The method of claim 1 , further comprising operating the electrical braking system in a pulsed mode, wherein when in the pulsed mode a switch that is parallel with a brake resistor is switched OFF; and
controlling a first brake drive switch based on a configurable duty cycle.

3. The method of claim 1 , further comprising operating the electrical braking system in a resonance regenerative mode, wherein when in the resonance regenerative mode a switch parallel to the brake resistor is switched ON; and
controlling a first brake drive switch and a second brake drive switch in a sequential fashion which allows current to flow to a transformer for regeneration.

4. The method of claim 3 , further comprising storing the energy during the resonance regenerative mode.

5. The method of claim 3 , further comprising providing energy to an auxiliary system.

6. The method of claim 1 , further comprising operating the electrical brake system in a combination pulsed braking and resonance regenerative mode;
switching a switch parallel to the brake resistor OFF; and
switching a first brake drive switch according to a configurable duty cycle to allow for pulsed braking and resonance regeneration.

7. The method of claim 1 , wherein the sensed condition is a DC link voltage.

8. The method of claim 1 , wherein the sensed condition exceeds a DC link upper threshold voltage.

9. The method of claim 2 , wherein switching is controlled by pulse width modulation (PWM) signal.

10. A system comprising:
a controller;
a motor coupled to an H-bridge network;
a DC link coupled to the motor; and
an electrical braking system electrically coupled to the motor, the electrical braking system comprising:
a sense circuit configured to sense a condition of the DC link;
a brake resistor coupled to the DC link;
a drive circuit coupled to the sense circuit; and
a transformer for regeneration;

wherein the electrical braking system is configured in a star connected configuration, wherein the star connected configuration comprises a transformer coupled to each phase of the motor, wherein each transformer performs braking for each phase based at least in part on at least one of a mode and the sensed condition.

11. The system of claim 10 , wherein the electrical braking system is configured to operate in a pulsed mode, wherein when in the pulsed mode a switch that is parallel with the brake resistor is switched OFF; and
control a first brake drive switch based on a configurable duty cycle.

12. The system of claim 10 , wherein the electrical braking system is configured to operate in a resonance regenerative mode, wherein when in the resonance regenerative mode a switch that is parallel to the brake resistor is switched ON; and
control a first brake drive switch and a second brake drive switch in a sequential fashion which allows current to flow to the transformer for regeneration.

13. The system of claim 10 , wherein the electrical braking system is configured to operate in a combination pulsed braking and resonance regenerative mode;
switch a switch parallel to the brake resistor OFF; and
switch a first brake drive switch according to a configurable duty cycle to allow for pulsed braking and resonance regeneration.

14. The system of claim 10 , wherein the sensed condition is a DC link voltage.

15. The system of claim 10 , wherein the sensed condition exceeds a DC link upper threshold voltage.

16. The system of claim 10 , wherein the controller is configured to provide control signals including pulse width modulation (PWM) signal.

17. The system of claim 10 , wherein the sense circuit comprises a Zener diode configuration.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Sengodan Rajkumar

Classifications

• B60L7/22

  Dynamic electric resistor braking, combined with dynamic electric regenerative braking · CPC title

• B60L7/10

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title

• B60L7/18

  Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) · CPC title

• B60L7/003

  Dynamic electric braking by short circuiting the motor · CPC title

• B60L1/003 Primary

  to auxiliary motors, e.g. for pumps, compressors · CPC title