Positive and negative output DC-DC power source structure based on Boost

Abstract

The invention belongs to the technical field of power supply of power sources, and provides a positive and negative output DC-DC power source structure based on Boost. The structure comprises a Boostconversion structure, and the Boost conversion structure comprises an input direct current power source Vin, an inductor L1, a diode D1, a switching tube Q1 and an energy storage filter capacitor C2;a capacitor C1 and a diode D2 which are in series connection with each other are inserted into a switching node between the inductor L1 and the diode D1, and a diode D3, an inductor L2 and an energy storage filter capacitor C3 which are in series connection are connected into a series-connection node of the capacitor C1 and the diode D2, and two output ends of negative voltage are draw forth fromthe two ends of the energy storage filter capacitor C3; a negative electrode of the diode D3 is connected with the capacitor C1, a positive electrode of the diode D2 is connected with the capacitor C1, and the capacitor C1, the inductor L2 and the energy storage filter capacitor C3 constitute an LC filter circuit. By means of the positive and negative output DC-DC power source structure, a switching tube or a switching control chip does not need to be additionally arranged, the circuit structure is simple, and the cost is low; the structure has a high current output capability and small current pulsation, and the positive voltage and negative voltage are nearly symmetric.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a DC-DC power supply structure based on Boost positive and negative outputs. Background technique [0002] In most electronic circuits, a single power supply is generally used, and in order to better utilize the accuracy of the amplifier circuit, it is generally necessary to use a positive and negative boost power supply system. The current solutions generally use Boost, Buck-Boost, Cuk, Sepic and other circuit transformation structures. Among them, Boost is a positive boost conversion structure, Sepic is a positive buck-boost structure, Cuk, Buck-Boost is a negative boost structure, and these conversion structures must use at least one or more switching tubes (or switch control chips), inductors L, Diode D and capacitor C. If it is a positive and negative power supply, it is necessary to use one more switch tube (or switch control chip), or add more than one inductance L ...

AI Technical Summary

Problems solved by technology

If it is a positive and negative power supply, it is necessary to use an additional switch tube (or switch control chip), or add more than one inductor L to achieve the conversion requirements, which greatly increases the size and cost of the conversion circuit.

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