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Power driving circuit and control method thereof

A power drive circuit and drive resistor technology, applied in circuits, output power conversion devices, electronic switches, etc.

Pending Publication Date: 2022-07-19
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] like Figure 5 As shown, the current information is used as the reference of the SRC comparison level. In the actual circuit operation, due to the problem of microprocessor signal sampling, the operating characteristics of the current ripple will be ignored in the firmware program to implement the SRC method, thereby making the startup Signal EN SRC In the wrong case, the power switching element cannot be operated according to the expected result

Method used

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  • Power driving circuit and control method thereof
  • Power driving circuit and control method thereof
  • Power driving circuit and control method thereof

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Embodiment Construction

[0078] The technical content and detailed description of the present invention are described as follows with reference to the accompanying drawings.

[0079] See Image 6 As shown, it is a circuit block diagram of the power drive circuit of the present invention. The power driving circuit includes a power conversion module 20 , a plurality of gate drivers 31 , 32 , a waveform processing unit 10 , a control unit 12 , a weighting unit and a comparator 16 . The power conversion module 20 includes a plurality of switches. In one embodiment, each switch is an insulated gate bipolar transistor (IGBT), but this is not a limitation for the power conversion module 20 to receive the DC power sources DC+, DC- To output AC power (including AC voltage signal Vo and AC current signal iload).

[0080] Each gate driver 31 , 32 is respectively connected to the control terminal of each switch (taking IGBT as an example, the control terminal is the gate terminal), and each gate driver 31 , 32 ...

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Abstract

A power driving circuit includes a power conversion module, a plurality of gate drivers, a waveform processing unit, a control unit, a weight unit, and a comparator. Each gate driver includes a drive resistance setpoint. The waveform processing unit outputs a current absolute value waveform of the AC power. The weight unit generates a trigger voltage. When the comparator judges that the current absolute value waveform is larger than the trigger voltage, a slew rate control signal is output to each gate driver. When each gate driver receives the slew rate control signal, the driving resistance set value of each gate driver is reduced. The invention further relates to a control method used for the power driving circuit.

Description

technical field [0001] The present invention relates to a power circuit and a control method thereof, in particular to a power circuit and a control method thereof capable of dynamically adjusting the set value of the driving resistance. Background technique [0002] Power switching elements, such as MosFET, IGBT, SiC-MosFET and GaN, are widely used in power electronic systems, such as front-end converters, vehicle charging systems or drive inverters. switching losses. In response to the trend of low loss and high efficiency, the gate drive resistance of the power switching element is adjusted, and the resistance value is gradually reduced, so that the overlapping area of ​​the power switching element during the switching process is reduced, and the loss is further reduced, to raise efficiency. However, if the drive resistance is blindly reduced, the slope of the voltage change (dv / dt) and current change (di / dt) will gradually increase during the switching process, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088H03K17/165H03K17/04123H02M3/1588H02M1/0019H02M1/08H02M1/0054H02M1/0029H02M1/327H02M1/0025H03K17/168
Inventor 林益慰胡凯维邢雷锺
Owner DELTA ELECTRONICS INC