WO2023187863A1 - 駆動回路、駆動回路の制御方法 - Google Patents
駆動回路、駆動回路の制御方法 Download PDFInfo
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- WO2023187863A1 WO2023187863A1 PCT/JP2022/014850 JP2022014850W WO2023187863A1 WO 2023187863 A1 WO2023187863 A1 WO 2023187863A1 JP 2022014850 W JP2022014850 W JP 2022014850W WO 2023187863 A1 WO2023187863 A1 WO 2023187863A1
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- Prior art keywords
- circuit
- switching element
- drive circuit
- overcurrent
- charge
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 19
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000000284 extract Substances 0.000 claims abstract description 20
- 238000000605 extraction Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 11
- 239000004065 semiconductor Substances 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
Definitions
- the present invention relates to the configuration of a drive circuit and its control, and particularly relates to a technique that is effective when applied to an inverter drive circuit.
- Power conversion devices are also used in electrified vehicles, and are also used to convert DC power supplied from a battery to generate AC power for driving a motor. In such fields, there is a need to reduce switching loss in order to increase battery usage efficiency and suppress loss due to heat generation in power conversion devices.
- Patent Document 1 discloses "a power conversion device that enables more effective protection control by having a configuration in which priorities are provided between a plurality of protection circuits.”
- an object of the present invention is to provide a drive circuit and a control method for the drive circuit that can reduce switching loss during normal operation and reduce the amount of surge during off-operation when overcurrent is detected. .
- a drive circuit and a method of controlling the drive circuit according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4.
- FIG. 1 is a diagram showing a schematic configuration of a power conversion device (inverter) 1 of this embodiment, and shows an example in which it is connected between a battery 300 and an electric motor 800.
- the power conversion device 1 of the present embodiment includes switching elements 500 to 505, a control circuit 100, predrivers 400 to 405, current sensors 600 to 602, and overcurrent Detection circuits 700 to 702 are provided.
- switching elements 500 to 505 voltage-driven power semiconductors such as IGBTs and SiC MOSFETs are used. However, it is not limited to IGBTs and SiC MOSFETs, and other power semiconductors may be used.
- IGBTs and SiC MOSFETs By charging and discharging electric charge to each control terminal of the switching elements 500 to 505, the switching elements 500 to 505 are switched, and the path through which the current flows is changed, thereby transferring power from the battery 300 side to the motor 800 side. Perform the conversion.
- the battery 300 supplies a DC voltage that serves as a power source in the power conversion device 1.
- Pre-drivers 400-405 are pre-driver circuits that drive switching elements 500-505, respectively.
- the overcurrent detection circuits 700 to 702 are circuits that detect overcurrent in each phase of the power supply system to the motor 800. If the current of each phase detected by the current sensors 600 to 602 exceeds a certain value in both positive and negative directions, an output indicating an overcurrent is generated.
- the OR circuit 210 may have a latch function, and when an overcurrent state is detected, it may hold the state until it is released.
- the holding state may be released by an instruction from the control circuit 100, or a configuration may be adopted in which the overcurrent state is held for a certain period of time and then released.
- the electric motor 800 operates as a motor when supplied with electric power.
- a three-phase motor is assumed as the electric motor 800, and an example is given in which it is driven using six switching elements 500 to 505 mounted on the power conversion device 1.
- the present invention is not limited to this. Instead, a configuration may be used in which the number of phases and the number of switching elements of the motor 800 are increased or decreased, including a circuit for driving according to the configuration.
- FIG. 2 is a diagram showing a circuit configuration of the predriver 400 in FIG. 1, and shows a circuit for one system of predrivers 400 to 405 (predriver 400) that drives switching elements 500 to 505.
- the drive circuit 901 extracts the charge from the control terminal of the switching element 500, and the switching element 500 is turned off.
- the drive circuit 902 is used to extract the charge from the control terminal of the switching element 500. That is, the drive circuit 902 extracts the charge from the control terminal of the switching element 500, and the switching element 500 is turned off. At this time, both the drive circuit 900 and the drive circuit 901 are in an off state, and charge extraction is performed using only the drive circuit 902. In other words, when a phase overcurrent is detected, drive circuit 900 and drive circuit 901 are disabled.
- the faster the charge extraction speed from the control terminal and the higher the slew rate of the switching element the larger the surge generated in the switching element 500, and the surge voltage exceeds the rated voltage and the switching element 500 There is a high possibility that it will be destroyed. In particular, when an overcurrent is detected, a larger current flows than during normal operation, and a larger surge is likely to occur.
- the charge extraction speed from the control terminal can be increased. It is necessary to suppress the slew rate of the switching element 500 by limiting .
- the drive circuit used for extracting the charge from the control terminal is separated between normal operation and when overcurrent is detected in the phase of the motor 800. It becomes possible to individually adjust the resistor 1001 used when an overcurrent is detected in a phase of the motor 800 and the resistor 1002 used when an overcurrent is detected in a phase of the motor 800.
- the power conversion device 1 of the present embodiment includes the switching elements 500 to 505 and an on-circuit (drive circuit) that injects charges into the gates of the switching elements 500 to 505 in accordance with drive signals from the control circuit 100.
- a first off circuit (drive circuit 901 and resistor 1001) that extracts charges from the gates of switching elements 500 to 505 in response to a drive signal from control circuit 100, and a first off circuit (drive circuit 901 and resistor 1001) that A second OFF circuit (drive circuit 902 and resistor 1002) different from the first OFF circuit (drive circuit 901 and resistor 1001) is provided, which extracts charges from the gates of switching elements 500 to 505.
- SYMBOLS 1... Power converter (inverter), 100... Control circuit, 210... OR circuit, 300... Battery, 310... Capacitor, 400-405, 420-425... Pre-driver, 500-505, 510-515... Switching element, 600-602...Current sensor, 700-702, 1200...Overcurrent detection circuit, 800...Electric motor, 900-902...Drive circuit, 1000-1002, 1100-1105...Resistor, 1300...OR circuit.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims (15)
- スイッチング素子と、
駆動信号に応じて前記スイッチング素子のゲートに電荷を注入するオン回路と、
駆動信号に応じて前記スイッチング素子のゲートから電荷を引き抜く第1のオフ回路と、
過電流検出信号に応じて前記スイッチング素子のゲートから電荷を引き抜く、前記第1のオフ回路とは異なる第2のオフ回路と、
を備える駆動回路。 - 請求項1に記載の駆動回路であって、
前記第2のオフ回路を用いて前記スイッチング素子のゲートから電荷を引抜く際、
前記オン回路と、前記第1のオフ回路とをオフ状態とする駆動回路。 - 請求項1に記載の駆動回路であって、
前記第2のオフ回路による前記スイッチング素子のゲートからの電荷引抜き速度は、前記第1のオフ回路による前記スイッチング素子のゲートからの電荷引抜き速度よりも遅い駆動回路。 - 請求項3に記載の駆動回路であって、
前記第1のオフ回路は、第1の抵抗を有し、
前記第2のオフ回路は、第2の抵抗を有し、
前記第1のオフ回路は、前記第1の抵抗により前記スイッチング素子のゲートからの電荷引抜き速度が制御され、
前記第2のオフ回路は、前記第2の抵抗により前記スイッチング素子のゲートからの電荷引抜き速度が制御される駆動回路。 - 請求項4に記載の駆動回路であって、
前記第2の抵抗の抵抗値は、前記第1の抵抗の抵抗値よりも大きい駆動回路。 - 請求項1に記載の駆動回路であって、
相の過電流を検出した際、
前記オン回路と、前記第1のオフ回路とを無効化する駆動回路。 - 請求項1に記載の駆動回路であって、
相の過電流を検出した際、当該相の過電流の論理和を保持する駆動回路。 - 請求項7に記載の駆動回路であって、
前記駆動信号を出力する制御回路により、前記論理和の保持状態がクリアされる駆動回路。 - 請求項7に記載の駆動回路であって、
前記論理和の保持状態は、一定時間経過後にクリアされる駆動回路。 - 請求項1に記載の駆動回路であって、
相の過電流を検出する第1の過電流検出回路と、
前記スイッチング素子の過電流を検出する第2の過電流検出回路と、を備え、
前記第1の過電流検出回路により相の過電流を検出した際に前記スイッチング素子のゲートから電荷を引き抜くオフ回路と、前記第2の過電流検出回路により前記スイッチング素子の過電流を検出した際に前記スイッチング素子のゲートから電荷を引き抜くオフ回路とに、前記第2のオフ回路を共用する駆動回路。 - オン信号に応じてスイッチング素子のゲートに電荷を注入し、
オフ信号に応じて前記スイッチング素子のゲートから電荷を引き抜き、
過電流を検出した場合、前記オフ信号に応じた電荷引き抜き経路とは異なる経路で、前記スイッチング素子のゲートから電荷を引き抜く駆動回路の制御方法。 - 請求項11に記載の駆動回路の制御方法であって、
前記過電流を検出した場合の電荷引抜き速度は、前記オフ信号に応じた電荷引抜き速度よりも遅い駆動回路の制御方法。 - 請求項11に記載の駆動回路の制御方法であって、
相の過電流を検出した際、当該相の過電流の論理和を保持する駆動回路の制御方法。 - 請求項13に記載の駆動回路の制御方法であって、
前記論理和の保持状態は、一定時間経過後にクリアされる駆動回路の制御方法。 - 請求項11に記載の駆動回路の制御方法であって、
相の過電流を検出した際の電荷引き抜き経路と、前記スイッチング素子の過電流を検出した際の電荷引き抜き経路とに、同じ電荷引き抜き経路を共用する駆動回路の制御方法。
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PCT/JP2022/014850 WO2023187863A1 (ja) | 2022-03-28 | 2022-03-28 | 駆動回路、駆動回路の制御方法 |
JP2024510559A JPWO2023187863A1 (ja) | 2022-03-28 | 2022-03-28 | |
CN202280093439.6A CN118923028A (zh) | 2022-03-28 | 2022-03-28 | 驱动电路、驱动电路的控制方法 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63257468A (ja) * | 1987-04-10 | 1988-10-25 | Mitsubishi Electric Corp | インバ−タの異常表示回路 |
JP2019088084A (ja) * | 2017-11-06 | 2019-06-06 | 株式会社デンソー | 判定装置 |
JP2021176253A (ja) * | 2020-05-01 | 2021-11-04 | 株式会社デンソー | ゲート駆動装置および複合ゲート駆動装置 |
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2022
- 2022-03-28 CN CN202280093439.6A patent/CN118923028A/zh active Pending
- 2022-03-28 JP JP2024510559A patent/JPWO2023187863A1/ja active Pending
- 2022-03-28 WO PCT/JP2022/014850 patent/WO2023187863A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63257468A (ja) * | 1987-04-10 | 1988-10-25 | Mitsubishi Electric Corp | インバ−タの異常表示回路 |
JP2019088084A (ja) * | 2017-11-06 | 2019-06-06 | 株式会社デンソー | 判定装置 |
JP2021176253A (ja) * | 2020-05-01 | 2021-11-04 | 株式会社デンソー | ゲート駆動装置および複合ゲート駆動装置 |
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