Power supply charging control circuit and power supply charging control method

Abstract

The invention provides a power supply charging control circuit and a power supply charging control method. The power supply charging control circuit is characterized in that an AC (Alternating Current) power supply outputs a direct current through a rectification module to charge an electrolytic capacitor, so as to form a charging loop, a plurality of current limiting modules are connected in parallel and then connected to the charging loop in series, when the power supply charging control circuit is powered up, one or several current limiting modules in the plurality of current limiting modules are controlled to be conducted at different time by an MCU (Microprogrammed Control Unit), so as to charge the electrolytic capacitor. Through adoption of the power supply charging control circuitof the invention, one or several current limiting modules in the plurality of current limiting modules are controlled to be conducted at different time, so that resistances of current limiting resistors in the charging loop are different when charging is performed at different time, in addition, the resistance of the current limiting resistor which is charged firstly is large so as to suppress surge, and the resistance of the current limiting resistor which is charged later is small so as to accelerate a charging speed, in comparison with a conventional charging circuit with a single current limiting resistor or without current limiting resistor, the power supply charging control circuit of the invention accelerates the charging speed while suppressing a large surge charging current, thereby improving operation stability of the whole circuit device.

Description

technical field [0001] The invention relates to the field of AC / DC power converters, in particular to a power charging control circuit and a power charging control method. Background technique [0002] Currently used in high-power AC / DC (alternating current / direct current) power converters, such as DC high-voltage power supply (over 300V) power converters for compressor drive circuits of inverter air conditioners, large power converters are used on the DC side. High-capacity electrolytic capacitors (more than 400uF) are used for smoothing and filtering. At the moment of power-on, the AC power supply can charge the electrolytic capacitors through current-limiting devices such as PTC or resistors. At present, only a single current-limiting device is used, which requires a long charging time, so As a result, it takes a relatively long time for the power converter to output stable DC power to supply power to subsequent loads; and if the current limiting device is not used, when ...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a power supply charging control circuit, the purpose is to solve the problem that when the existing inverter air conditioner is started, the operating frequency of the compressor is relatively slow, which leads to the inability to quickly output the cooling or heating capacity of the air conditioner, thus affecting the user. comfort experience

Images