High-efficiency energy-saving charger

Abstract

The invention discloses a high-efficiency energy-saving charger, which is formed by sequentially connecting an input electromagnetic interference (EMI) module, a rectification filtering module 1, an active power factor corrector (APFC), a direct current (DC) / DC regulation module, a rectification filtering module 2 and an output EMI module. An over-voltage and over-current detector is connected between the rectification filtering module 1 and the APFC. A voltage and current power factor detector is connected between the rectification filtering module 2 and the output EMI module. A protection control circuit is also connected to the DC / DC regulation module, and is also connected with the over-voltage and over-current detector and the voltage and current power factor detector respectively. The high-efficiency energy-saving charger has the remarkably advantages of increasing a power factor of electrical equipment and reducing harmonic pollutions to a power grid.

Description

technical field [0001] The invention designs a high-efficiency and energy-saving electric vehicle charger, and in particular relates to the technical field of a high-efficiency and energy-saving charger utilizing an active power factor corrector. Background technique [0002] At present, the national standard requires the power factor of the charger in the electric vehicle charging station to be ≧90%, but the power factor of most chargers is only about 90%, which will cause harmonic pollution of the power grid, the power factor will drop, and the reactive component is mainly high-order Harmonics, the amplitude of the third harmonic is about 95% of the amplitude of the fundamental wave, and the amplitude of the fifth harmonic is about 70% of the amplitude of the fundamental wave. The seventh harmonic amplitude is approximately 45% of the fundamental amplitude. High-order harmonics will cause harm to the power grid, reduce the power factor at the input end, and generate stron...

AI Technical Summary

Problems solved by technology

[0002] At present, the national standard requires the power factor of the charger in the electric vehicle charging station to be ≧90%, but the power factor of most chargers is only about 90%, which will cause harmonic pollution of the power grid, the power factor will drop, and the reactive component is mainly high-order Harmonics, the amplitude of the third harmonic is about 95% of the amplitude of the fundamental wave, and the amplitude of the fifth harmonic is about 70% of the amplitude of the fundamental wave. The seventh harmonic amplitude is about 45% of the fundamental amplitude

High-order harmonics will cause harm to the power grid, reduce the power factor of the input terminal, and generate strong electromagnetic interference (EMI), causing potential harm to the safe operation of the power grid and other electrical equipment

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