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SiC switch tube driving circuit and method of synchronous rectification Buck convertor

A synchronous rectification and drive circuit technology, applied in the direction of DC power input conversion to DC power output, instruments, electrical components, etc., can solve the problems of improving the complexity of system control and extra, achieve crosstalk, achieve suppression, and meet harsh requirements Effect

Active Publication Date: 2018-03-06
SHANGHAI INST OF SPACE POWER SOURCES
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  • Application Information

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Problems solved by technology

Although this method has a better crosstalk suppression effect, it requires additional control signals, which increases the complexity of system control

Method used

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  • SiC switch tube driving circuit and method of synchronous rectification Buck convertor
  • SiC switch tube driving circuit and method of synchronous rectification Buck convertor
  • SiC switch tube driving circuit and method of synchronous rectification Buck convertor

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Embodiment Construction

[0033] The SiC switching tube drive circuit suitable for synchronous rectification Buck converters provided by the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0034] The working principle of the synchronous rectification Buck converter is as follows: figure 1 As shown, unlike the traditional Buck converter, it uses a switching tube Q L Replacing the rectifier diode is beneficial to improve the conversion efficiency of the entire converter. through the output voltage U o Sampling and processing, the control circuit generates an adjustable pulse width modulation signal PWM H and PWM L , and through the drive circuit, output the corresponding drive signal S H and S L , drive the high and low side switches respectively Q H and Q L , so that the converter at the input voltage U in regulation, the output voltage is maintained U o constant.

[0035] Compared with Si material switching tu...

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Abstract

The invention discloses a SiC switch tube driving circuit of a synchronous rectification Buck convertor, and belongs to the technical field of driving a DC-DC convertor power switch tube in a near space aircraft energy system. The circuit is composed of a high-side driver, a low-side driver, a high-side assisting unit and a low-side assisting unit. Combining with a working principle of the synchronous rectification Buck convertor, the SiC switch tube driving circuit controls break-make of related transistors in the assisting units by utilizing voltage values of high-low side drive resistors according to working characteristics of high-low side SiC switch tubes, in the process of fast break-make of the high-side switch tube, a grid source voltage clamp of the low-side switch tube is placedat a turn-off negative voltage position of the low-side switch tube, mis-breakover due to drive signal oscillation of the low-side switch tube or the situation that the low-side switch tube surpassesa biggest turn-off negative voltage value is avoided, and crosstalk inhibition is effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of driving a DC-DC converter power switch tube in an energy system of a near-space vehicle, and in particular relates to a SiC switch tube drive circuit suitable for a synchronous rectification Buck converter. [0002] Background technique [0003] At present, the application of traditional Si power devices is common and mature. However, as the requirements for the power density, conversion efficiency and other technical indicators of DC-DC converters and environmental adaptability continue to increase in the field of space vehicles, due to the physical characteristics of Si materials The limitations make it difficult for Si power devices to withstand higher voltages, higher frequencies, and more stringent temperature conditions. Compared with Si materials, wide bandgap semiconductor materials such as SiC have larger bandgap width, higher thermal conductivity, faster saturation rate and higher breakdown ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/158
CPCY02B70/10
Inventor 王霄董宝磊刘涛张旭何小斌
Owner SHANGHAI INST OF SPACE POWER SOURCES
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