Circuit topological structure of low-voltage input isolation type multi-circuit output switching power supply

Abstract

The invention discloses a circuit topological structure of a low-voltage input isolation type multi-circuit output switching power supply. The circuit topological structure comprises a voltage boosting circuit, a power conversion circuit and a rectifying circuit, wherein the voltage boosting circuit is connected with the power conversion circuit; and the power conversion circuit is connected with the rectifying circuit. By virtue of the circuit topological structure, multi-circuit isolation voltage output in a low-voltage input condition is realized, and the product assembling density and the production cost are lowered.

Description

technical field [0001] The invention relates to a circuit topological structure, in particular to the circuit topological structure of a low-voltage input isolation type multi-channel output switching power supply. Background technique [0002] Switching power supply and DC / DC converter as the secondary power supply of the system are widely used in military and civilian electronic systems such as aerospace, aviation, ships, weapons, electronics, railways, communications, medical electronics, and industrial automation equipment. As these devices become more and more miniaturized, higher requirements are placed on the weight, volume, and cost of DC / DC converters, and DC / DC power supplies with small volume and high cost performance are becoming more and more popular. [0003] The working voltage of the PWM control chip used in the isolated DC / DC converter is mostly above 5V, and the driving voltage of the corresponding VMOS tube is also high. The isolated PWM control chip and c...

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Problems solved by technology

[0003] The working voltage of the PWM control chip used in the isolated DC / DC converter is mostly above 5V, and the driving voltage of the corresponding VMOS tube is also high. The isolated PWM control chip and corresponding The VMOS tube is very rare and the cost is very high, which has caused certain difficulties in the design of low-voltage input isolated multi-output switching power supply.

[0004] At present, low-voltage input isolation multi-output switching power supplies at home and abroad are mostly designed with discrete components (that is, multiple sets of triodes and diodes are connected by wires to generate related functions of integrated circuits) for design, which increases the assembly density of the product. Affect the reliability of the product

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