Startup control circuit possessing acceleration startup function and operation method thereof

Abstract

A startup control circuit possessing an acceleration startup function and an operation method thereof are applied in a power supply. A primary side winding is coupled with a transformer through a power switch so as to switch and control the transformer, and then an output voltage of the power supply is adjusted. The startup control circuit comprises a capacitor and a startup control apparatus. The startup control apparatus comprises an enabling switch unit and a power supply control unit. Through controlling conduction and cut-off of the enabling switch unit of the startup control apparatus, the control of the acceleration startup of the power supply can be provided and power supply stability of the power supply can be ensured.

Description

technical field [0001] The present invention relates to a start control circuit and its operating method, in particular to a start control circuit with accelerated start function applied to a power supply and its operating method. Background technique [0002] Pulse Width Modulation technology is an existing technology, which is used to control and stabilize the output power of the power supply. The power supply must provide various protection functions, such as over-voltage, over-current and over-power protection, to protect the power supply and peripheral circuits to avoid permanent damage. [0003] US Patent No. 6,587,357 discloses a power starting device for a switching power supply. See Figure 1A and Figure 1B The circuit block diagram of the existing power converter with a power controller and the output waveform diagram of the internal circuit of the power controller are respectively corresponding to Fig. 1 and Fig. 2 of US Patent No. 6,587,357. The switching pow...

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Problems solved by technology

In contrast, this design technology has the following disadvantages: 1. When the starting current is greater than the current consumed by the control chip, the power supply voltage will continue to increase, eventually burning the control chip or causing the control chip to enter overvoltage protection; 2. . In practice, due to the reduction of the voltage buffer zone, and the delay time circuit is a fixed preset delay time (predetermined delay time), in different product applications, it may cause the auxiliary voltage and Both power supply voltage stabilizing capacitors are still not enough to supply the control chip, causing the power supply voltage to be too low and shutting down the system

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