Single pipe resonant type soft switch inversion circuit

Abstract

The invention relates to an inversion circuit which comprises a main circuit and a control circuit. The main circuit comprises an LC resonant network formed by connecting an isolation diode VD, an inductor L and a capacitor C in parallel, a switch tube VT and a return stroke diode VD0. Fed back sampling voltage signals are taken from the voltage to ground at the anode end of the switch tube VT, a control circuit controls the switch tube VT to be connected and disconnected, zero voltage connection of the switch tube VT is achieved, the LC resonant network is located in the resonant state, positive and negative voltage in semi-circle symmetry can be output accordingly, and the oscillation amplitude and the output power and the connection time of the switch tube VT are in direct proportion.

Description

technical field [0001] The invention provides a single-tube resonant soft-switching inverter circuit, which relates to the field of electric energy conversion and can be widely used in fields such as electromagnetic induction heating, gas discharge lamps, and high-voltage generation; the resonant inductor and resonant capacitor are connected in parallel and work in resonance state, its oscillation amplitude and output power are proportional to the conduction time of the switch tube. Background technique [0002] The inverter circuit that converts direct current into alternating current with a certain frequency is an indispensable and widely used power conversion circuit in today's society. Among them, the inverter circuit that connects the resonant capacitor and inductor in parallel and then connects the switching tube in series has a simple structure and is easy to control , low cost and other advantages and has been widely used, but the existing inverter circuit works in t...

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Problems solved by technology

[0002] The inverter circuit that converts direct current into alternating current with a certain frequency is an indispensable and widely used power conversion circuit in today's society. Among them, the inverter circuit that connects the resonant capacitor and inductor in parallel and then connects the switching tube in series has a simple structure and is easy to control , low cost and other advantages and has been widely used, but the existing inverter circuit works in the quasi-resonant state of zero current conduction, the sampling voltage signal fed back by the circuit is taken from the parallel resonant circuit, and the feedback control circuit is complicated; there is also its resonance The voltage of the inductance and capacitance parallel circuit is basically a sine half wave, with obvious DC components, and the power quality of the inverter output is very rough, which can only be applied to loads with low requirements, such as electromagnetic induction heating, and for those with high requirements, Circuits that require positive and negative half cycle symmetry of the waveform cannot be applied at all

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