Double-boost-structure soft switching rectification charging multiplex circuit

Abstract

Provided is a double-boost-structure soft switching rectification charging multiplex circuit, which comprises a transistor Q1, a transistor Q2, a transistor Q5, a diode D1, a diode D2, a diode D5, a diode D7, a diode D8, a capacitor C1, a capacitor C3 and an inductor L3. A branch formed by connecting the inductor L3 and the transistor Q5 in series in the same direction is connected in parallel in the same direction to a branch formed by connecting the transistor Q1, the transistor Q2 and the capacitor C1 in series in the same direction; a branch formed by connecting the diode D7 and the diode D8 in the same direction is connected in parallel between the inductor L3 and the transistor Q5; the diode D1 is connected in parallel between the two ends of the transistor Q1; the diode D2 is connected in parallel between the two ends of the transistor Q2; the diode D5 is connected in parallel between the two ends of the transistor Q5; and the capacitor C3 is connected in parallel between the two ends of a branch formed by the inductor L3 and the diode D7. The double-boost-structure soft switching rectification charging multiplex circuit realizes commercial power boost and battery boost as well as battery charging, thereby greatly reducing hardware complexity of the whole machine, improving reliability and reducing cost.

Description

technical field [0001] The invention relates to the field of supporting circuits for boost circuits, in particular to a double-boost structure soft-switch rectification and charging multiplexing circuit. Background technique [0002] BOOST circuit is a switching DC boost circuit, which is mainly used in power electronics technology, switching power supply technology, new energy technology and other fields. At present, the BOOST circuit basically adopts the scheme of charging the inductor first and then releasing the energy stored in the inductor to the capacitor to increase the voltage. However, due to the high loss of the switching device and the large heat generation, the circuit conversion efficiency is low and the circuit life is short. [0003] Soft switch: The English name of soft switch is "soft switching", that is, through reasonable circuit design, the switching device is in the zero voltage / zero current on / off state at the moment of turning on and off, so as to red...

AI Technical Summary

Problems solved by technology

Some existing "soft switches" designed for BOOST boost circuit architecture are usually realized by means of auxiliary transistor circuits. Due to the addition of auxiliary transistors, this "soft switch" circuit must have a drive circuit and occupy the I / O of the control chip. O interface, while increasing the difficulty of control, when the I / O interface is not enough, it may be necessary to choose a chip with a higher cost, which has certain limitations and the implementation method is more complicated

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