Energy conversion device and vehicle

Patent metadata

Field	Value
Publication number	US-11916504-B2
Application number	US-202017763962-A
Country	US
Kind code	B2
Filing date	Aug 18, 2020
Priority date	Sep 25, 2019
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An energy conversion device is provided. The energy conversion device includes a reversible pulse-width modulation (PWM) rectifier (102) and a motor coil (103). The motor coil (103) includes L sets of winding units, and each set of winding unit is connected with the reversible PWM rectifier (102), where L≥2 and is a positive integer. At least two sets of heating circuits of a to-be-heated device are formed by an external power supply (100), the reversible PWM rectifier (102), and the winding units in the motor coil (103). The energy conversion device controls the reversible PWM rectifier (102) according to a control signal, so that a current outputted from the external power supply (100) flows through at least two sets of winding units in the motor coil (103) to generate heat.

First claim

What is claimed is:

1. An energy conversion device, comprising a reversible pulse-width modulation (PWM) rectifier and a motor coil, wherein
the motor coil comprises L sets of winding units, each set of winding unit is connected with the reversible PWM rectifier, and L≥2 and is a positive integer;
at least two sets of heating circuits of a to-be-heated device comprise an external power supply, the reversible PWM rectifier, and the winding units in the motor coil; and
the energy conversion device controls the reversible PWM rectifier according to a control signal, so that a current outputted from the external power supply flows through at least two sets of the winding units of the motor coil to generate heat, and a vector sum of resultant current vectors of the at least two sets of the winding units on a quadrature axis of a synchronous rotating reference frame based on motor rotor field orientation is zero.

2. The energy conversion device according to claim 1 , wherein
when L1 sets of the winding units of the L sets of the winding units operate in the at least two sets of heating circuits, the L1 sets of the winding units respectively correspond to L1 resultant current vectors, and form

L
⁢
1

2

pairs of the resultant current vectors; amplitudes of two resultant current vectors of each pair of the resultant current vectors are equal; each pair of the resultant current vectors are symmetrical with respect to a direct axis of the synchronous rotating reference frame; L≥L1≥2; and L1 is an even number.

3. The energy conversion device according to claim 1 , wherein
when L1 sets of the winding units of the L sets of winding units operate in the at least two sets of heating circuits, the L1 sets of the winding units correspond to L1 resultant current vectors, and form

L
⁢
1

2

pairs of the resultant current vectors; amplitudes of two resultant current vectors of each pair of the resultant current vectors are equal; at least one pair of the resultant current vectors are symmetrical with respect to a direct axis in the synchronous rotating reference frame; angles of two resultant current vectors of at least one pair of the resultant current vectors differ by 180°; L≥L1≥2; and L1 is an even number.

4. The energy conversion device according to claim 1 , wherein
when L2 sets of the winding units of the L sets of the winding units operate in the at least two sets of heating circuits, the L2 sets of the winding units correspond to L2 resultant current vectors, and form

L
⁢
2

-
1

2

pairs of the resultant current vectors and a first resultant current vector; amplitudes of two resultant current vectors of each pair of the resultant current vectors are equal; each pair of the resultant current vectors are symmetrical with respect to a direct axis of the synchronous rotating reference frame; the first resultant current vector is located on the direct axis of the synchronous rotating reference frame; L≥L2≥3; and L2 is an odd number.

5. The energy conversion device according to claim 1 , wherein
when L3 sets of the winding units of the L sets of the winding units operate in the at least two sets of heating circuits, the L3 sets of the winding units correspond to L3 resultant current vectors, and form

L
⁢
3

-
1

2

pairs of the resultant current vectors and a second resultant current vector; amplitudes of two resultant current vectors of each pair of the resultant current vectors are equal; angles of the two resultant current vectors of each pair of the resultant current vectors differ by 180°; the second resultant current vector is located on a direct axis of the synchronous rotating reference frame; L≥L3≥3; and L3 is an odd number.

6. The energy conversion device according to claim 2 , wherein an angle of the resultant current vector of each of the L sets of the winding units with respect to the direct axis of the synchronous rotating reference frame is a fixed value.

7. The energy conversion device according to claim 2 4 , wherein an angle of the resultant current vector of at least one pair of the winding units in the L sets of the winding units with respect to the direct axis of the synchronous rotating reference frame is a variable value; an angle of one resultant current vector of the pair of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame is θ L/2-1 =2 πf 1 t+θ L/2-0 ; an angle of the other resultant current vector of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame is θ L/2-2 =−θ L/2-1 ; f 1 is a change frequency of the angle of the resultant current vector with respect to the direct axis of the synchronous rotating reference frame; θ L/2-0 is an initial angle of the angle of one of the pair of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame; and t is a time.

8. The energy conversion device according to claim 5 , wherein an angle of the resultant current vector of at least one pair of the winding units in the L sets of the winding units with respect to the direct axis of the synchronous rotating reference frame is a variable value; an angle of one of the pair of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame is θ L/2-1 =2 πf 1 t+θ L/2-0 ; an angle of the other of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame is θ L/2-1 =2 πf 1 t+θ L/2-0 ; f 1 is a change frequency of the angle of the resultant current vector with respect to the direct axis of the synchronous rotating reference frame; θ L/2-0 is an initial angle of the angle of one of the pair of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame; and t is a time.

9. The energy conversion device according to claim 2 , wherein
amplitudes of at least one pair of the resultant current vectors are equal and are variable values; the angles of the pair of the resultant current vectors with respect to the direct axis of the synchronous rotating reference frame are fixed values;
the amplitudes of the at least one pair of the resultant current vectors are √{square root over (2)}|i* s |sin(2 πf 2 ); f 2 is a change frequency of the amplitudes of the resultant current vectors; and √{square root over (2)}|i* s | is a maximum amplitude of the resultant current vectors.

10. The energy conversion device according to claim 1 , comprising a controller which is connected with the reversible PWM rectifier and the controller is configured to:
acquire, according to an external control signal, a target heating power that needs to be generated by the motor coil;
obtain a target resultant current vector of each set of the winding unit ac

Assignees

• Byd Co Ltd

Inventors

• Ling Heping
• Li Jicheng
• Liu Changjiu
• Xie Feiyue
• Zhang Yuxin

Classifications

• B60H1/143

  the heat being derived from cooling an electric component, e.g. electric motors, electric circuits, fuel cells or batteries · CPC title

• H02P27/08 Primary

  with pulse width modulation · CPC title

• B60L1/02

  to electric heating circuits · CPC title

• B60L53/22

  Constructional details or arrangements of charging converters specially adapted for charging electric vehicles · CPC title

• H02M7/797

  using semiconductor devices only · CPC title