Method of controlling dual inverter
US-2018152127-A1 · May 31, 2018 · US
Drive system for electric motor
US10790774B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10790774-B2 |
| Application number | US-201916442606-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 17, 2019 |
| Priority date | Jun 18, 2018 |
| Publication date | Sep 29, 2020 |
| Grant date | Sep 29, 2020 |
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- Title
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Abstract
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A drive system for an electric motor includes a first inverter that includes first switching elements, a second inverter that includes second switching elements, and a control unit that includes a first inverter control calculation section controlling on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control calculation section controlling on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, and a control synchronization section synchronizing the first carrier wave with the second carrier wave. When a sum of voltages of the first voltage source and the second voltage source is more than a voltage determination threshold, and torque of a rotating electric machine is smaller than a torque determination threshold, the control synchronization section synchronizes the first carrier wave with the second carrier wave.
First claim
Opening claim text (preview).
What is claimed is: 1. A drive system for an electric motor, the system controlling drive of a rotating electric machine having windings for a plurality of phases, comprising: a first inverter that includes first switching elements and is connected to one end of each of the windings and a first voltage source; a second inverter that includes second switching elements and is connected to the other end of each of the windings and a second voltage source that is provided separately from the first voltage source; and a control unit that includes a first inverter control calculation section controlling an on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control calculation section controlling an on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, and a control synchronization section synchronizing the first carrier wave with the second carrier wave, wherein when a sum of a voltage of the first voltage source and a voltage of the second voltage source is more than a voltage determination threshold, and torque of the rotating electric machine is smaller than a torque determination threshold, the control synchronization section synchronizes the first carrier wave with the second carrier wave. 2. A drive system for an electric motor, the system controlling drive of a rotating electric machine having windings for a plurality of phases, comprising: a first inverter that includes first switching elements and is connected to one end of each of the windings and a first voltage source; a second inverter that includes second switching elements and is connected to the other end of each of the windings and a second voltage source that is provided separately from the first voltage source; and a control unit that includes a first inverter control calculation section controlling an on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave and a second inverter control calculation section controlling an on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, wherein when a sum of a voltage of the first voltage source and a voltage of the second voltage source is more than a voltage determination threshold, and torque of the rotating electric machine is smaller than a torque determination threshold, the control unit controls a modulation factor of the first modulation wave and a modulation factor of the second modulation wave to be different from each other. 3. The drive system for the electric motor, according to claim 2 , wherein the control unit controls one of the modulation factor of the first modulation wave and the modulation factor of the second modulation wave to be more than 1 and controls the other of the modulation factor of the first modulation wave and the modulation factor of the second modulation wave to be set in accordance with a drive request. 4. A drive system for an electric motor, the system controlling drive of a rotating electric machine having windings for a plurality of phases, comprising: a first inverter that includes first switching elements and is connected to one end of each of the windings and a first voltage source; a second inverter that includes second switching elements and is connected to the other end of each of the windings and a second voltage source that is provided separately from the first voltage source; and a control unit that includes a first inverter control calculation section controlling an on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave and a second inverter control calculation section controlling an on-off operation of each of the second switching elements based on a second carrier wave and a second modulation wave, wherein when a sum of a voltage of the first voltage source and a voltage of the second voltage source is more than a voltage determination threshold, and torque of the rotating electric machine is smaller than a torque determination threshold, the control unit controls at least one of a frequency of the first carrier wave and a frequency of the second carrier wave to be smaller than in an ordinary time. 5. The drive system for the electric motor, according to claim 4 , wherein the control unit sets a frequency of the first carrier wave and a frequency of the second carrier wave to be lower as a modulation factor of the first modulation wave and a modulation factor of the second modulation wave are lower.
Assignees
Inventors
Classifications
- H02P27/06Primary
using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title
by pulse-width modulation · CPC title
with pulse width modulation · CPC title
by dynamic converters · CPC title
with on-off control between two set points, e.g. controlling by hysteresis · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10790774B2 cover?
- A drive system for an electric motor includes a first inverter that includes first switching elements, a second inverter that includes second switching elements, and a control unit that includes a first inverter control calculation section controlling on-off operation of each of the first switching elements based on a first carrier wave and a first modulation wave, a second inverter control cal…
- Who is the assignee on this patent?
- Denso Corp, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02P27/06. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 29 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).