High-pressure large-current direct-current charger

Abstract

The embodiment of the invention discloses a high-pressure large-current direct-current charger, comprising an APFC (Active Power Factor Correction) rectification module, a charging module and a main control module, wherein the APFC rectification module largely improves an output power factor of a charging system, a DC / AC (Direct Current / Alternating Current) conversion module of the charging module is controlled by the main control module to be capable of realizing that an IGBT (Insulated Gate Bipolar Transistor) is opened under zero voltage and is closed under zero current, and switching power consumption is close to zero, thus the temperature rise of the IGBT of a power module in the DC / AC conversion module is very low, the service life of the direct-current charger is prolonged, and the reliability of the direct-current charger is improved; in addition, a high-frequency voltage transformer of a voltage-increasing module of the charging module converts alternating current output by the voltage increasing module to be charging current of a power storage battery by increasing voltage of positive and negative high-voltage pulses output by the DC / AC conversion module through the DC / AC conversion module of the charging module. Therefore, the high-pressure large-current direct-current charger of the embodiment of the invention has the characteristics of reliability and efficiency.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a high-voltage and high-current DC charger. Background technique [0002] The charger adopts high-frequency power supply technology and advanced intelligent dynamic adjustment charging technology, which has the characteristics of high charging efficiency, simple operation, light weight and small size. [0003] The existing electric vehicle chargers at home and abroad generally use the following two methods to achieve high-voltage and high-current output: [0004] One is to obtain high-voltage direct current by boosting and rectifying the alternating current of the power grid through a power frequency transformer, and charge the power battery through conversion, but this method has disadvantages such as small output capacity and small output current; [0005] The other is to use several charging modules in series. This method has the hidden danger of uneven voltage of eac...

AI Technical Summary

Problems solved by technology

[0004] One is to obtain high-voltage direct current by boosting and rectifying the alternating current of the power grid through a power frequency transformer, and charge the power battery through conversion, but this method has disadvantages such as small output capacity and small output current;

[0005] The other is to use several charging modules in series. This method has the hidden danger of uneven voltage of each charging module. If the voltage of each charging module is uneven, it may lead to the formation of system circulation, and then cause the system to collapse.

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