Non-symmetric Z-source half-bridge converter with dual output function

Abstract

The invention provides a non-symmetric Z-source half-bridge converter with a dual output function. The converter comprises a direct-current power supply, a diode, a first capacitor, a second capacitor, a first inductor, a second inductor, a first switching tube, a second switching tube, a third switching tube, a first load and a second load. The first inductor, the second inductor, the first capacitor and the second capacitor constitute a Z source impedor. Due to the adoption of the Z source impedor, damage caused by direct connection of the switching tubes is avoided, and a boosting effect can be achieved when direct connection of the switching tubes happens. Two-way output boosting and step-down can be respectively controlled by controlling the switch-on time and duty ratio of the three switching tubes, and symmetry and asymmetry of positive pulses and negative pulses of two-way output voltages can be achieved. Only three switching tubes are used, it is not needed that capacitors are connected on a power supply side in parallel, and dual-way output can be achieved. The non-symmetric Z-source half-bridge converter with the dual output function has the advantages of being high in reliability, wide in output voltage range and rich in output alternating current pulse waveform and is particularly suitable for dual-output electrochemistry power supply devices for electrolysis, electroplating and other electrochemistry aspects.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to an asymmetric double-output Z-source half-bridge converter. Background technique [0002] In a conventional half-bridge converter, the inverter bridge arm is directly connected in parallel with the DC voltage source. When the upper and lower switch tubes of the inverter bridge arm are switched through due to false triggering, a very large current will flow and the switch tube will be damaged. Moreover, the amplitude of the output AC voltage of this type of half-bridge inverter is only half of the input voltage, which belongs to the step-down inverter, and the output voltage range is relatively narrow. In order to increase the amplitude of the output AC voltage, the traditional method is to add a step-up link in the front stage of the inverter, or to connect a transformer at the output end for step-up. In the scheme of adding a step-up link in the front stage ...

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Problems solved by technology

In addition, the corresponding control will increase the cost and control difficulty, and reduce the stability of the system

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