car charging device

Abstract

The invention discloses a vehicle-mounted charging device, which belongs to the technical field of charging and power supply. The vehicle-mounted charging device comprises a filter circuit, a rectifier circuit, a power factor compensation circuit, a DC / DC conversion circuit and a vehicle-mounted energy storage device, wherein the DC / DC conversion circuit comprises a switch circuit, a DC / DC control circuit connected with the control end of the switch circuit and a second feedback circuit connected with the output end of the switch circuit; the output end of the second feedback circuit is connected with the input end of the DC / DC control circuit; the switch circuit comprises a switch K2, an inductor L2 and a capacitor C2; the switch K2 and the inductor L2 are serially connected to serve as the output end of the switch circuit; and one end of the capacitor C2 is connected with the output end and the other end is grounded. Technical problems of large electromagnetic interference and much energy loss as the prior vehicle-mounted charging device commonly uses a transformer are solved, the switch circuit is adopted for outputting charging voltage, energy loss is low, and the charging efficiency is high.

Description

technical field [0001] The invention relates to the technical field of charging and power supply, in particular to a vehicle charging device. Background technique [0002] The existing on-board charging system generally adopts the technical route of filter circuit, AC / DC rectifier circuit, power factor compensation (PFC) circuit, isolated DC / DC conversion circuit and integrated control circuit. It mainly adopts rectification technology and DC / DC charging technology. [0003] Such as figure 1 It shows the schematic diagram of the existing on-board charging system. The AC220V voltage passes through the filter circuit to filter out the interference of the high-frequency pulse of the external power grid on the on-board charging system, and then outputs a relatively smooth primary current and voltage through the rectifier circuit and the power factor compensation (PFC) circuit. , and finally through the insulating DC / DC conversion circuit to output the secondary DC voltage and ...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention lies in the disadvantages of using a transformer in the insulated DC / DC conversion circuit of the existing on-board charging system, such as large mass, complicated circuit design, high energy loss, and high manufacturing cost. An on-board charging device that replaces the transformer for energy conversion

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