Power conversion apparatus

Patent metadata

Field	Value
Publication number	US-12191739-B2
Application number	US-202117385789-A
Country	US
Kind code	B2
Filing date	Jul 26, 2021
Priority date	Jan 24, 2019
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A power conversion apparatus includes: a rotating electric machine that has a winding; an inverter that has a series-connection body of an upper arm switch and a lower arm switch; and a capacitor that is connected in parallel to the series-connection body. The power conversion apparatus includes: a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects the winding with both a negative-electrode side of the first storage battery and a positive-electrode side of the second storage battery; and a control unit that controls switching of the upper arm switch and the lower arm switch such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

First claim

What is claimed is:

1. A power conversion apparatus comprising:
a multi-phase rotating electric machine that has a winding;
a multi-phase inverter that has a series-connection body of an upper arm switch and a lower arm switch; and
a capacitor that is connected in parallel to the series-connection body, wherein
the power conversion apparatus includes
a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects the winding with both a negative-electrode side of the first storage battery and a positive-electrode side of the second storage battery,
a connection switch that is provided on the connection path, electrically connects the negative-electrode side of the first storage battery and the positive-electrode side of the second storage battery in response to the connection switch being set to be in an on-state, and electrically interrupts connection between the negative-electrode side of the first storage battery and the positive-electrode side of the second storage battery in response to the connection switch being set to be in an off-state, and
a control unit that controls switching of the upper arm switch and the lower arm switch such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

2. The power conversion apparatus according to claim 1 , wherein:
the control unit controls switching of the upper arm switch and the lower arm switch of at least two phase such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

3. The power conversion apparatus according to claim 1 , wherein:
the control unit synchronizes switching control of upper arm switches of all phases and synchronizes switching control of lower arm switches of all phases such that the current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

4. The power conversion apparatus according to claim 1 , wherein:
the control unit sets the connection switch to be in the on-state when determined that a temperature-increase request regarding the first storage battery and the second storage battery is present, and sets the connection switch to be in the off state when determined that the temperature-increase request is not present.

5. The power conversion apparatus according to claim 1 , wherein:
the control unit sets a switching frequency of switching control when driving of the rotating electric machine is stopped to a frequency that is higher than a switching frequency of the upper and lower arm switches when the rotating electric machine is driven.

6. The power conversion apparatus according to claim 1 , wherein:
the connection path electrically connects a neutral point of the winding with both the negative-electrode side of the first storage battery and the positive-electrode side of the second storage battery.

7. The power conversion apparatus according to claim 1 , further comprising:
a voltage information detecting unit that detects voltage information of the first storage battery and the second storage battery, wherein
the control unit corrects the command value such that a terminal voltage of the first storage battery and a terminal voltage of the second storage battery are equalized based on the detected voltage information.

8. A power conversion apparatus comprising:
a multi-phase rotating electric machine that has a winding;
a multi-phase inverter that has a series-connection body of an upper arm switch and a lower arm switch; and
a capacitor that is connected in parallel to the series-connection body, wherein
the power conversion apparatus includes
a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects the winding with both a negative-electrode side of the first storage battery and a positive-electrode side of the second storage battery, and
a control unit that controls switching of the upper arm switch and the lower arm switch such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path, wherein

the control unit sets the command value such that, in a single cycle of a command value of a current that flows to the connection path, an area of a region that is prescribed by the command value that is positive and an area of a region that is prescribed by the command value that is negative are equal, and controls switching to control the current that flows to the connection path to the command value.

9. The power conversion apparatus according to claim 8 , wherein:
the control unit controls switching of the upper arm switch and the lower arm switch of at least two phase such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

10. The power conversion apparatus according to claim 8 , wherein:
the control unit synchronizes switching control of upper arm switches of all phases and synchronizes switching control of lower arm switches of all phases such that the current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path.

11. The power conversion apparatus according to claim 8 , wherein:
the control unit sets a switching frequency of switching control when driving of the rotating electric machine is stopped to a frequency that is higher than a switching frequency of the upper and lower arm switches when the rotating electric machine is driven.

12. The power conversion apparatus according to claim 8 , wherein:
the control unit sets the command value such that the command value that is positive and the command value that is negative have point symmetry in relation to a zero-crossing timing of the command value in the single cycle of the command value.

13. The power conversion apparatus according to claim 12 , wherein:
a frequency that is an inverse of the single cycle of the command value is set to a frequency between 30 Hz and 100 Hz.

14. The power conversion apparatus according to claim 8 , wherein:
the connection path electrically connects a neutral point of the winding with both the negative-electrode side of the first storage battery and the positive-electrode side of the second storage battery.

15. The power conversion apparatus according to claim 8 , further comprising:
a voltage information detecting unit that detects voltage information of the first storage battery and the second storage battery, wherein
the control unit corrects the command value such that a terminal voltage of the first storage battery and a terminal voltage of the second storage battery are equalized based on the detected voltage information.

16. A power conversion apparatus comprising:
a multi-phase rotating electric machine that has a winding;
a multi-phase inverter that has a series-connection body of an upper arm switch and a lower arm switch; and
a capacitor that is connected in parallel to the series-connection body, wherein
in each phase, a connection point of the upper arm switch and the lower arm switch configuring the series-connection body;
the power conversion apparatus includes
a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects a negative-electrode side of t

Assignees

• Denso Corp

Inventors

• Nishimura Shusei
• Iyasu Seiji
• Umemoto Hisashi
• Fukaya Atsushi

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02P27/085

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title

• H02P25/16

  characterised by the circuit arrangement or by the kind of wiring · CPC title

• H02M3/155

  using semiconductor devices only · CPC title