Power source circuit

Abstract

The invention provides a power source circuit suitable for the power source field. The power source circuit comprises a voltage reducing circuit, a rectification circuit, a voltage stabilizing filter circuit, a direct-current output circuit and a control circuit, wherein the voltage reducing circuit, the rectification circuit, the voltage stabilizing filter circuit, the direct-current output circuit and the control circuit are sequentially connected. The input end of the voltage reducing circuit is connected with an external electric supply alternating-current power source. The output end of the control circuit is connected to the control end of the voltage reducing circuit and outputs a current value by controlling a total capacitance value in the voltage reducing circuit. According to the power source circuit, the control circuit turns on and off one or more capacitor in the resistance-capacitance voltage reducing circuit to change the total capacitance value in the resistance-capacitance voltage reducing circuit, the output current value is further adjusted, so that the load capacity of the circuit is enhanced, and the stand-by power consumption is lowered. Moreover, loss of energy sources can be lowered, and the safety of the circuit can be improved.

Description

technical field [0001] The invention belongs to the field of power supply, in particular to a power supply circuit. Background technique [0002] At present, many power circuits with low power consumption and large load capacity use switching power supply circuits, which are costly and complicated, and are difficult to meet the requirements of electromagnetic compatibility. In the prior art, the power consumption of the general resistance-capacitance step-down circuit is mainly consumed on the DC power, the power consumption is not controlled, and the standby power consumption is the same as the working power consumption. The capacity of the capacitor is determined. Therefore, the RC step-down circuit in the prior art also has the disadvantages of large power consumption and small load carrying capacity. Moreover, the capacitor capacity in the prior art is not easy to increase. Contents of the invention [0003] The purpose of the present invention is to provide a power...

AI Technical Summary

Problems solved by technology

[0002] At present, many power circuits with low power consumption and large load capacity use switching power supply circuits, which are costly and complicated, and are difficult to meet the requirements of electromagnetic compatibility.

In the prior art, the power consumption of the general resistance-capacitance step-down circuit is mainly consumed on the DC power, and the power consumption is not controlled, and the standby power consumption is the same as the working power consumption. When a large working current is required, the step-down Capacitor capacity decision

Therefore, the RC step-down circuit of the prior art also has the disadvantages of large power consumption and small load capacity.

Moreover, the capacitor capacity of the prior art is not easy to increase

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