Grid drive circuit of ZCS full bridge converter employing SiC power tubes
A technology of full-bridge converter and gate drive circuit, which is applied in the output power conversion device, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., to improve efficiency, reduce losses, and improve reliability. sexual effect
Active Publication Date: 2016-10-12
SOUTHEAST UNIV
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[0004] The present invention aims at the problem of less research in the field of full-bridge converter SiC power tube grid drive in the prior art, and provides a gate drive circuit of a ZCS full-bridge converter using a SiC power tube to reduce the drive of the ZCS full-bridge converter loss, further improving the efficiency of the converter while increasing the reliability of the system
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[0022] Such as figure 1 , the entire gate drive circuit includes a PWM generator, a MOS drive network 1, a resonant gate drive isolation transformer 2 and an RCD shift circuit 3, and number 4 is a bridge arm of the driven SiC power transistor ZCS full-bridge converter. The PWM generator generates a control signal, which is transmitted to the resonant gate drive isolation transformer 2 through the MOS drive network 1, and moves up a potential through the RCD shift circuit 3, thereby driving the SiC power transistor Q of a bridge arm in the ZCS full-bridge converter 5 and Q 6 , where capacitance C gs5 and C gs6 Q respectively 5 and Q 6The parasitic capacitance between gate and source. The PWM generator is generally served by a microcontroller in the whole system, and generates corresponding waveforms according to different applications. In the present invention, the PWM generator generates a control signal, which is added to each MOS transistor grid in the MOS drive network...
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A grid drive circuit of a ZCS full bridge converter employing SiC power tubes comprises a PWM generator, an MOS driving network, a resonance grid driving isolation transformer and an RCD shift circuit, MOS pipe grid control signals in the MOS driving network are provided by the PWM generator, the output of the MOS driving network is output to the RCD shift circuit via the resonance grid driving isolation transformer, the output signals of the RCD shift circuit serve as grid driving signals of SiC power tubes of the full bridge converter to drive upper and lower SiC power tubes in two bridge arms of the full bridge converter, and the RCD shift circuit is used to adjust grid driving level of the SiC power tubes to realize voltage shift of the grid drive circuit, so that the driving voltage is suitable for SiC power tubes. Leakage inductors in secondary side of the resonance grid driving isolation transformer and grid source parasitic capacitors of SiC power switch tubes are utilized to generate resonance, and the electric energy on the parasitic capacitors can be recovered for reuse. Loss is reduced, and the efficiency is improved.
Description
technical field [0001] The invention relates to a gate drive circuit of a power tube in a ZCS full-bridge converter, in particular to a gate drive circuit of a full-bridge converter using a SiC power tube (a metal-oxide semiconductor field effect transistor of SiC material). Background technique [0002] With the rapid development of power electronics technology, power converter applications have higher and higher requirements for high frequency and high power density. When the switching frequency is increased to a certain level, problems such as significant increase in switching loss, high switching stress, high electromagnetic radiation and noise emerge in an endless stream. The introduction of soft switching technology has effectively improved the performance of high-frequency converters. Soft switching technology means that power devices commutate in a zero-voltage (ZVS) switching mode or a zero-current switching (ZCS) mode. The ZCS full-bridge converter is a typical so...
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Login to View More IPC IPC(8): H02M7/219H02M3/155
CPCH02M3/155H02M7/219H02M7/2195Y02B70/10
Inventor 钱钦松刘琦刘鹏俞居正孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV