Bridge type single-firing line power taking circuit

Abstract

The invention discloses a bridge type single-firing line power taking circuit. The bridge type single-firing line power taking circuit comprises a bridge type power taking circuit, an energy storage system, a detection system, a driving system and a control system, wherein the bridge type power taking circuit comprises a first diode (D1), a second diode (D2), a first metal oxide semiconductor (MOS) transistor (Q1) and a second MOS transistor (Q2), the first diode (D1), the second diode (D2), a parasitic diode (D3) of the first MOS transistor (Q1) and a parasitic diode (D4) of the second MOS transistor (Q2) form a rectification bridge structure when the first MOS transistor (Q1) and the second MOS transistor (Q2) are in switch-off states, the energy storage system is used for storing energy taken by the bridge type power taking circuit, and a voltage detection part in the detection system is used for detecting the taken voltage VCC, comparing the voltage VCC with a set judgment voltage and then converting a comparison value to a signal to be sent to the control system. By the bridge type single-firing line power taking circuit, the risk that a stable voltage of a single firing line in the prior art is taken to enable that the power taking circuit cannot be damaged by an impact current is solved.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to the on-state single-fire-wire power-taking technology, and in particular to a bridge-type single-fire-wire power-taking circuit. Background technique [0002] In the smart home control system, the power supply mode of the home appliance controller (such as the lighting controller) needs zero and live wires [0003] In some cases, the newly renovated users can solve this problem through wiring, but for the already renovated users, there is only one fire wire to reach the controller, and it will not work normally when facing such users. Most users only have live wires in the wall box at home. This puts forward a requirement for the design of the smart switch, which must extract stable energy from the circuit with only live wires to supply power to the control system. There are not many ways to take power in the on-state of a single live wire switch, and there are problems such as unstabl...

AI Technical Summary

Problems solved by technology

There are not many ways to take power in the on-state of a single live wire switch, and there are problems such as unstable power supply voltage, large fluctuations, insufficient power supply current, and burnout of the power supply system. This is mainly due to the different loads applied to the switch. The current is also different. If the obtained energy is not detected, there will be fluctuations in the power supply voltage

In addition, the LED lamps that are widely used now are capacitive loads. The current waveform flowing through this type of load is not strictly sinusoidal, and its waveform will produce sudden changes at the peaks and valleys. There is a large surge, which will burn the power system

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