Energy-storage half-bridge type inverter of low-additional-voltage zero-voltage switch and modulating method
A technology of zero-voltage switching and additional voltage, which is applied in the direction of high-efficiency power electronic conversion, conversion of irreversible DC power input to AC power output, and climate sustainability. Frequency and other issues, to achieve the effect of increasing power density, improving circuit efficiency, and increasing operating frequency
Active Publication Date: 2013-03-27
SHANGHAI JIAO TONG UNIV
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The invention provides an energy-storage half-bridge type inverter of a low-additional-voltage zero-voltage switch and a modulating method. The energy-storage half-bridge type inverter comprises a direct-current side storage battery, direct-current side partial-pressure capacitors, an alternating-current side filter inductor and a single-phase bridge arm, wherein the single-phase bridge arm comprises two full-control main switches with anti-parallel diodes. A serially connected branch circuit of an auxiliary switch with an anti-parallel diode and a clamping capacitor is connected among the direct-current side partial pressure capacitors and a direct-current bus of the single-phase bridge arm, a resonance inductor is connectively crossed at two ends of the branch circuit, and two ends of the main switches and the auxiliary switch are connected with the capacitors in parallel. The energy-storage half-bridge type inverter runs with load independently or in a grid connection manner, the main switches adopt a sine wave pulse width modulation method, and modulation signals of the auxiliary switch are synchronous with those of the main switches. The auxiliary switch only acts once in each switch period so that zero-voltage conducting of all the main switches can be realized, reverse restoration current of the anti-parallel diodes of the main switches is suppressed, voltage stress of the switches is equal to the voltage of the direct-current side of the inverter, the loss of the switches is low, circuit efficiency is high, work frequency is improved and power density is improved.
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