Water Cooled Electric Vehicle Charger

Abstract

The invention relates to a water-cooling electric vehicle charger. A digital control chip, digital to analog converters and a fourth switch are connected in series to a positive input end of an error amplifier; a negative input end of the error amplifier is connected with a delay network; the delay network is connected with four voltage sampling network units which are connected in parallel; the first voltage sampling network unit consists of a first voltage sampling network and a first switch which is connected with the first voltage sampling network; the second voltage sampling network unit consists of a second voltage sampling network and a second switch which is connected with the second voltage sampling network; the third voltage sampling network unit consists of a third voltage sampling network and a third switch which is connected with the third voltage sampling network; the fourth voltage sampling network unit consists of fourth voltage sampling networks; the digital control chip is in control connection with the first switch, the second switch and the third switch; and the digital to analog converters are arranged among the four voltage sampling network units and the digital control chip. By sectional sampling, the sampling resolution is improved, and the sampling accuracy of output voltage is remarkably improved.

Description

technical field [0001] The invention relates to a water-cooled electric vehicle charger. Background technique [0002] Current water-cooled electric vehicle chargers, such as figure 1 , including a pulse width modulator 1, a digital control chip 2, a compensation network 4, a voltage sampling network 5, an error amplifier 9 and a digital-to-analog converter 10, and the digital control chip 2 and the digital-to-analog converter 10 are connected in series to the negative of the error amplifier 9 Input end, the negative input end of error amplifier 9 is connected to voltage sampling network 5, voltage sampling network 5 provides output voltage 8, is connected with compensation network 4 between the negative input end of error amplifier 9 and the output end, the positive input end of error amplifier 9 The internal voltage reference 7 is provided, the output terminal of the error amplifier 9 is connected to the pulse width modulator 1, and the output of the pulse width modulator...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a water-cooled electric vehicle charger, which aims to solve the problems of low accuracy of output voltage and decrease of output accuracy with the change of sampling range, etc.

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