Power supply equipment and automatic current limit control method

Abstract

The invention provides a power supply device and an automatic current limiting control method. The power supply device comprises a power converter, a limited current circuit, a comparison circuit and a control circuit. The power converter includes a charging circuit, generates a power ready signal, and is used for charging according to a charging enabling signal so as to generate a supply voltage, wherein, peripheral equipment determines whether to apply the supply voltage according to the power ready signal. The limited current circuit receives a current source enabling signal for controlling a current source and provides a limited current reference voltage according to the enabling state of the current source. The comparison circuit is used for generating the charging enabling signal according to the limited current reference voltage and an output current of the power converter in order to determine whether to charge or not. The control circuit receives the power ready signal and a plurality of limited current control signals so as to generate the current source enabling signal according to the power ready signal and the limited current control signals and further automatically switch to limit current. The invention can effectively promote the stability of the system.

Description

technical field [0001] The present invention relates to a control circuit, in particular to a control circuit for controlling the current limit value in the starting state of a power converter. Background technique [0002] Electronic devices usually need to use power converters, such as boost converters (Booster converters), buck converters (Buck converters), power management devices such as chargers, to provide appropriate operating voltages to the electronic devices inside the electronic devices. element. In a conventional design, when the electronic device starts up, the power converter draws a large amount of current from the battery of the electronic device to charge the capacitor to achieve a stable output voltage. Especially, when multiple electronic components operating at different voltages are integrated in the electronic device, multiple power converters usually need to be integrated. Therefore, when the electronic device starts up, since each power converter n...

AI Technical Summary

Problems solved by technology

In order to bear such a large instantaneous current, the system needs to use a higher specification battery, thus increasing the system cost

In addition, the instantaneous large current draw may also cause the supply voltage to fall below the operating voltage range of the system, resulting in abnormal shutdown of the system

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