LED power supply circuit

Abstract

An embodiment of the invention discloses an LED power supply circuit which comprises a voltage reducing circuit, a filter, a rectifier bridge, a valley fill circuit and two groups of LED loads. The voltage reducing circuit consists of a resistor and a capacitor which are connected in parallel and is connected to the input end in series, the filter is an LC filter and performs high-frequency filtering on reduced voltage, the rectifier bridge performs full-wave rectification on filtered voltage, the valley fill circuit is connected to the rectified voltage output end of the rectifier bridge in parallel, and two groups of LED loads are of same-number structures and connected to the output end. By adopting the LED power supply circuit, input pulsating wave forms can be rectified, and the circuit power can be improved to be higher than 0.9. In addition, the LED power supply circuit can be combined with different forms of loads.

Description

technical field [0001] The invention relates to an LED power supply circuit. Background technique [0002] At present, the power electronics technology is developing rapidly. The use of power factor correction technology can make the AC input current waveform close to the AC input voltage waveform, and achieve the same phase of the voltage, that is, the load is equivalent to a resistive load, and the correction circuit is divided into two types: active and passive. One, passive correction usually uses large-capacity inductors and capacitors, resulting in too large volume, and active correction has the advantages of small size and light weight. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide an LED power supply circuit. Can provide a LED power supply circuit with small size, high power factor, and load combination. [0004] In order to solve the above technical problems, an embodiment of the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the power electronics technology is developing rapidly. The use of power factor correction technology can make the AC input current waveform close to the AC input voltage waveform, and achieve the same phase of the voltage, that is, the load is equivalent to a resistive load, and the correction circuit is divided into two types: active and passive. One, passive correction usually uses large-capacity inductance and capacitance, resulting in too large volume, active correction has the advantages of small size, light weight, etc.

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