Single-stage PFC (power factor correction) converter and electric vehicle charging apparatus equipped with same

Abstract

The invention discloses a single-stage PFC (power factor correction) converter and an electric vehicle charging apparatus equipped with the same. The converter comprises a first rectifier bridge, a PFC full-bridge circuit, a high frequency transformer, a rectification filter circuit and a control unit, wherein the first rectifier bridge is connected with an input power supply; the PFC full-bridge circuit is connected with the first rectifier bridge; the PFC full-bridge circuit comprises a first switching device, a second switching device, a third switching device and a fourth switching device that form a full-bridge bridge arm and are provided with a first node and a second node; one end of the primary winding of the high frequency transformer is connected with the first node through leakage inductance while the other end of the high frequency transformer is connected with the second node; the rectification filter circuit is connected with the secondary winding of the high frequency transformer; and the control unit controls the first switching device, the second switching device, the third switching device and the fourth switching device so as to enable the single-stage PFC converter to realize power factor correction and DC/DC isolation conversion. The converter can realize the power factor correction and electrical isolation between a high voltage circuit and a low voltage circuit; and in addition, the single-stage PFC converter is small in size and high in working efficiency.

Description

technical field [0001] The invention relates to the field of power supply technology, in particular to a single-stage PFC (Power Factor Correction, power factor correction) converter and a charging device for an electric vehicle having the same. Background technique [0002] Whether the charging device of an electric vehicle is an on-board charger or a DC charging pile, the circuit topology is inseparable from the PFC circuit. The PFC circuit is an important part of converting AC power to DC power. It can not only ensure that the power supply does not affect the quality of the power grid during switching, but also reduce current harmonic distortion and reactive power generated during power supply operation. [0003] In the related art, the circuit topology of the charging device is a series structure of a PFC circuit and a DC / DC converter. The stability and precision of this structure are relatively high, but many components are used, the control circuit is complicated, and ...

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Problems solved by technology

[0003] In the related art, the circuit topology of the charging device is a series structure of a PFC circuit and a DC / DC converter. The stability and precision of this structure are relatively high, but many components are used, the control circuit is complicated, and two stages are connected in series. much loss

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