PFC (Power Factor Correction) circuit compatible with single-phase and three-phase alternating current input and control method

Abstract

The invention relates to a PFC circuit compatible with single-phase and three-phase alternating current input and a control method, the PFC circuit comprises a power factor correction circuit, a voltage detection module and a control signal generation device, the voltage detection module is connected with the power factor correction circuit and is connected with the input of a single-phase or three-phase alternating current power grid side, and the control signal generation device generates control signals by collecting corresponding voltage and current signals. The voltage input into the alternating current power grid side is judged to control the closing state of the relay, and then the judged signal is input into the control signal generating device to control the opening and closing states of the switching tube, so that the circuit works in a single-phase mode or a three-phase mode to realize different levels of direct current voltage output. The device is compatible with single / three-phase power supply input, is wide in application scene, can be applied to a three-phase alternating current input occasion for quick charging, and can also be used for charging under the condition that only single-phase power supply input exists. And one set of equipment can meet different application occasions, so that the cost is greatly saved, and the applicability of the product is improved.

Description

technical field [0001] The invention relates to the technical field of new energy charging, in particular to a PFC circuit compatible with single-phase and three-phase AC input and a control method. Background technique [0002] As the country pays more and more attention to environmental protection, the development of the new energy industry is also getting faster and faster; in the choice of travel mode, more people tend to use new energy vehicles as the first choice for travel. With the popularization of new energy vehicles, their charging has become a very important issue. As a common power electronic conversion device, the on-board charger will cause harmonic pollution to the grid and the reactive power of the grid. The increase has also increasingly become one of the problems that need to be solved urgently in this field. [0003] In order to reduce the reactive power and reduce the harmonic content of the grid-side AC grid side flow, the PFC (power factor correction)...

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Problems solved by technology

[0003] In order to reduce the reactive power and reduce the harmonic content of the grid-side AC grid side flow, the PFC (power factor correction) circuit is used, but the charging method is limited by the grid input conditions of its use, such as charging on the highway Stations only have three-phase charging power supply, while most of residential areas and other occasions only have single-phase charging power supply; therefore, in order to improve the compatibility of charging methods, it is necessary for the PFC circuit to be compatible with single-phase / three-phase AC input requirements at the same time; however, the existing The existing problems of the PFC circuit are as follows: 1. The independent design of the PFC inductor requires three independent inductors, and the number of components is large, resulting in high volume and cost; 2. Soft switching is not considered during the switch conduction process, and switching loss is Larger, not conducive to the miniaturization and convenience of the device volume

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