AC/DC compatible vehicle-mounted charger pre-stage circuit and vehicle-mounted charger

Abstract

The invention discloses an AC / DC compatible vehicle-mounted charger pre-stage circuit and a vehicle-mounted charger. The pre-stage circuit consists of a rectifier circuit, an alternating-current voltage detection circuit, a direct-current voltage detecting circuit, a PFC circuit, a DC / DC boost circuit and a pulse width modulation integrated circuit. The input terminal of the rectifier circuit is connected with an external alternating-current input port; and the output terminal is respectively connected with the input terminal of the PFC circuit and the input terminal of the DC / DC boost circuit. An external direct-current input port is connected with the output terminal of the rectifier circuit; and the output terminal of the PFC circuit and the output terminal of the DC / DC boost circuit are connected with a post-stage power conversion circuit. A first PWM driving terminal of the pulse width modulation integrated circuit is connected with the PFC circuit; and a second PWM driving terminal of the pulse width modulation integrated circuit is connected with the DC / DC boost circuit. According to the technical scheme, compatibility of alternating-current and direct-current voltage inputs is realized; the improvement cost is low; the operation is stable; and the power grid interference and waveform distortion can be reduced.

Description

technical field [0001] The present invention relates to the technical field of charging, in particular to an AC-DC compatible vehicle-mounted charger front-stage circuit and the vehicle-mounted charger. Background technique [0002] Charging piles can be divided into AC charging piles and DC charging piles. The AC charging pile is a power supply device installed outside the electric vehicle and connected to the AC power grid to provide AC power for the on-board charger of the electric vehicle. It also has the function of metering and billing. AC charging piles generally only provide electric energy and do not provide vehicle status monitoring. The connection ports of AC charging piles are generally figure 1 As shown, among them, L is the AC power supply, N is the neutral line, PE is the ground terminal, NC1 is the empty terminal, NC2 is the empty terminal, CC is the charging connection confirmation terminal, and CP is the control confirmation terminal. The on-board charger...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of poor compatibility and high modification cost of the vehicle-mounted charger in the prior art. According to one aspect of the present invention, a front-stage circuit of an AC-DC compatible vehicle-mounted charger is proposed

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