A Dynamically Stable Power Supply for Low-Voltage Controllers

Abstract

The invention relates to a dynamically stable power supply of a low-voltage controller. A circuit of the power supply consists of two paths. One path is formed as follows: the secondary side of a mutual inductor is connected with a rectifier bridge; then the rectifier bridge DB1, a field effect transistor Q1, a resistor R1 and a triode Q2 are effectively connected; next, the abovementioned components are connected with an integrated operational amplifier, a resistor R2, a voltage-stabilizing tube D1, a resistor R3, and a resistor R4; and finally, the abovementioned components are connected with a resistor R5, a resistor R6, a voltage-stabilizing tube D3 and a capacitor C1. A transformer T1 of the other path of the power supply is connected with a rectifier bridge DB2, the capacitor C1, a diode D2 and a resistor R6. When a normal main circuit has power, the mutual inductor induces a voltage through the main circuit, and a stable power supply is guaranteed to be supplied to a subsequent circuit through dynamic regulation of the circuit; when the main circuit does not have power, an alternating current supplies the stable power supply to the subsequent circuit through the transformer; and when the main circuit and the transformer both have power at the same time, the diodes D2 and D4 form an ''OR'' relation, thereby ensuring that the subsequent circuit can obtain stable power supply.

Description

technical field [0001] The invention belongs to a low-voltage controller power supply, in particular to a dynamic and stable power supply for a low-voltage controller. Background technique [0002] With the development of low-voltage electrical appliances into the era of intelligence, the requirements for low-voltage protective appliances are getting higher and higher, which are not limited to current protection and residual current protection, but also have functions such as measurement of electric energy parameters, communication, and harmonic analysis. All these functions must be based on a stable power supply. The power supply of the original low-voltage controller is usually directly induced from the main circuit through the power supply element to obtain the voltage used by the subsequent circuit through voltage stabilization, filtering, and limiting; or directly takes power from the control circuit and obtains the required voltage of the subsequent circuit through a t...

AI Technical Summary

Problems solved by technology

The first type only has voltage stabilization, filtering, and clipping, and there is no dynamic adjustment circuit. When the voltage of the main circuit is unstable, the power circuit will be unstable, which will cause the controller to fail to work normally.

The second is that when the main circuit breaks down and trips, the control circuit that takes power from the main circuit will be powered off, which makes it inconvenient to check the fault condition of the controller, and it is impossible to eliminate the fault in a timely and effective manner.

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