Magnetic integration three-level dual-buck type half-bridge inverter and working mode thereof

Abstract

The invention relates to a magnetic integration three-level dual-buck type half-bridge inverter. An anode of a direct-current power supply Vd1 is connected with a drain of a switch tube S1; a source of the switch tube S1 is connected with a source of a switch tube S2 and a dotted terminal of an inductor L1; a synonym end of the inductor L1 is connected with a synonym end of an inductor L2, one end of an output filter capacitor C and one end of a load R; a dotted terminal of the inductor L2 is connected with an anode of a diode D2 and a drain of a switch tube S3; a source of the switch tube S3 is connected with a cathode of a direct-current power supply Vd2; a drain of the switch tube S2 is connected with a cathode of a diode D1; a cathode of the diode D2 is connected with a source of a switch tube S4; a cathode of the direct-current power supply Vd1, an anode of the direct-current power supply Vd2, an anode of the diode D1, the other end of the output filter capacitor C, the other end of the load R and a drain of the switch tube S4 are grounded. The invention also relates to a working mode. The magnetic integration three-level dual-buck type half-bridge inverter overcomes the defects that the voltage utilization ratio is low, bridge arm output is double-polar PWM modulating wave, the voltage stress of a power device is large, and the size of the output filter capacitor is large in the prior art.

Description

technical field [0001] The invention relates to a magnetically integrated three-level double-buck half-bridge inverter and its working mode. Background technique [0002] The multi-level inverter overcomes the problem of the voltage stress of the switch tube of the bridge inverter and the push-pull inverter, and the increase in the number of levels will make the total harmonic distortion of the output voltage smaller, and the multi-level inverter The inverter is suitable for the occasion of high-voltage and high-power conversion, but the multi-level inverter is limited by the voltage equalization of the input capacitor, and the coupling of multi-level modulation and input voltage equalization will cause the circuit structure and control of the multi-level converter to be complicated and difficult to adjust. slow. The traditional two-level double-buck half-bridge inverter has no bridge arm direct connection, no need to set dead time for the switching tube, and independent fr...

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a magnetically integrated three-level double-buck half-bridge inverter and its working mode, which overcomes the low utilization rate of voltage and the bipolar PWM modulation of the bridge arm output in the prior art The defects of large voltage stress of wave and power devices, and large volume of output filter inductor

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