# US 10,873,285 B2 · Inverter drive device and electrically driven vehicle system using the same

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- Number: US 10,873,285 B2
- Document ID: US10873285B2
- Status: Granted
- Kind: B2
- Application number: 16/468,594
- Filed: 2017-11-10
- Published: 2019-10-31
- Granted: 2020-12-22
- Earliest claimed: 2016-12-28
- Assignees: Hitachi Automotive Systems, Ltd.
- Applicants: Hitachi Automotive Systems, Ltd.
- Inventors: Takafumi Hara; Toshiyuki Ajima; Katsuhiro Hoshino; Akihiro Ashida; Kazuto Oyama
- Web page: https://patentgrep.com/patent/US10873285B2

## CPC

- H02M 7/5395: by pulse-width modulation
- H02P 27/08: with pulse width modulation
- H02M 7/48: using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M 7/537: using semiconductor devices only, e.g. single switched pulse inverters
- H02P 6/08: Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence)
- H02P 29/40: Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
- H02M 1/0012: {Control circuits using digital or numerical techniques (in DC/DC converters H02M3/157, H02M3/33515; in DC-AC converters H02M7/53873)}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.

## Claims

### Claim 1

An apparatus comprising:
a microcomputer;
an inverter drive device configured to switch a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal; and
a voltage timing generator, wherein
the first control mode is configured to update a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal,
the second control mode is configured to update a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal,
the third control mode is configured to update a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal, and
the voltage timing generator changes an update cycle according to a processing load factor of the microcomputer on the basis of a flow of the voltage timing generator.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein
the inverter drive device changes a frequency of the carrier signal and the three control modes so that a frequency of electromagnetic noise that occurs due to the PWM pulse signal of the power converter, the PWM signal occurring in the three control modes, does not coincide with a resonance frequency of the polyphase motor.

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein
the inverter drive device changes a frequency of the carrier signal and the three control modes so that a frequency of electromagnetic noise that occurs due to the PWM pulse signal of the power converter, the PWM signal occurring in the three control modes, does not coincide with a frequency of noise caused by electromagnetic exciting force of the other phase motor.

### Claim 4 (depends on 1)

An electrically driven vehicle system comprising:
the apparatus according to claim 1; and
a three-phase motor driven and controlled by the inverter drive device.