Low-voltage AC-DC (Alternating Current to Direct Current) converter

Abstract

The invention discloses a low-voltage AC-DC (Alternating Current to Direct Current) converter, which belongs to the technical field of power electronics. The low-voltage AC-DC converter comprises a power circuit, a detection circuit and a control circuit, wherein the voltage and current signals of the power circuit are connected with the control circuit through the detection circuit; the power circuit comprises a booster circuit and a voltage-doubling rectifying circuit; two output ends of the booster circuit are connected with two input ends of the voltage-doubling rectifying circuit; the output end of the voltage-doubling rectifying circuit is used for outputting a direct-current voltage; the detection circuit is used for detecting the voltage and the current signals of the power circuit; the input end of the control circuit is connected with the output circuit of the detection circuit; and the output end of the control circuit is connected with the control end of a power switch of the power circuit. According to the low-voltage AC-DC converter, a stable direct-current voltage is output, a unit input power factor is generated simultaneously, a flexible voltage adjusting capability is realized, and linear input impedance is obtained; moreover, a higher output voltage can be obtained under the condition of a lower input voltage, and the power consumption and voltage withstanding level of a power device are lowered; and the low-voltage AC-DC converter has is high in universality, simple in structure and low in cost.

Description

technical field [0001] The present invention relates to an AC-DC converter in the technical field of power electronics, in particular to a voltage doubler AC-DC converter, that is, a rectification circuit for obtaining high output voltage direct current when low voltage input alternating current. Background technique [0002] With the rapid development of microelectronics technology, control technology and power electronics technology, there are more and more application fields of uncontrolled AC-DC converters in the front stage, and the problem of harmonic current in the power grid caused by it is becoming more and more serious. Extensive and in-depth research on the generation principle and suppression strategy of harmonic current has promoted the rapid development of power factor correction (PFC) technology. In view of the different power supply voltage levels in countries around the world, such as 110VAC and 220VAC, etc., considering the grid voltage fluctuation, the exi...

AI Technical Summary

Problems solved by technology

[0004] To sum up, when a low single-phase AC voltage is input, the traditional power factor correction circuit has high requirements for power device selection and high cost, and cannot be applied to low AC voltage input-high voltage DC output applications

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