Main power supply circuit control method

Abstract

The invention discloses a main power supply circuit control method. A main power supply circuit converts alternating current into direct current through a rectification-limiting module and outputs thedirect current to a load, and the rectification-limiting module, an alternating current power supply, the main power supply circuit, an auxiliary power supply circuit and a power supply control unitare involved in the method. The main power supply circuit comprises a charging capacitor, a first switch tube, a second switch tube and a power supply loop; the first switch tube and the second switchtube are sequentially connected to a main switch circuit in series, and the power supply loop is connected with the first switch tube and the charging capacitor. An isolating switching circuit is connected between the rectification-limiting module and the alternating current power supply in series; an output contactor is switched off, non-controlled rectification is conducted by the rectification-limiting module, and direct-current voltage is output to the load. By means of the control method, the charging loss is greatly reduced, convenience is brought to integration, the size of a control circuit is reduced, output over voltage faults are avoided, the reliability of the load is improved, and the duration time of the load is increased.

Description

technical field [0001] The invention relates to the technical field of circuit control, in particular to a method for controlling a power supply main circuit. Background technique [0002] Among the traditional control circuit power supply methods, one is to directly use an independent power supply to supply power to the control circuit, such as a linear power supply or a low-power switching power supply. These independent power supplies convert the input voltage to the power supply required by the control circuit, which is usually expensive or inefficient, especially the linear power supply method. Another method is to use the magnetic components in the switching power supply itself, use electromagnetic coupling, and generate a suitable output to supply power to the control circuit through the auxiliary winding. This method has relatively high efficiency and low cost, but increases the processing of magnetic components. The complexity of the power supply voltage is usually...

AI Technical Summary

Problems solved by technology

These independent power supplies convert the input voltage to the power supply required by the control circuit, which is usually expensive or inefficient, especially the linear power supply method

Another method is to use the magnetic components in the switching power supply itself, use electromagnetic coupling, and generate a suitable output to supply power to the control circuit through the auxiliary winding. This method has relatively high efficiency and low cost, but increases the processing of magnetic components. The complexity of the power supply voltage is usually affected by the output voltage and load, the change is large, and the quality is not high