LED power supply circuit

A technology of power supply circuit and step-down circuit, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., and can solve the problems of large size

Inactive Publication Date: 2014-02-12
吴汉肱
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  • Abstract
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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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Embodiment Construction

[0009]

[0010] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below.

[0011] refer to figure 1 The schematic diagram of the circuit of the present invention is shown.

[0012] The present invention includes a step-down circuit, a filter, a rectifier bridge, a valley-filling circuit, and an LED load. The step-down circuit is composed of a resistor R1 and a capacitor C1 connected in parallel to the voltage input terminal, and the filter is composed of an inductor L1 and a capacitor C2. High-frequency filter, which filters out high-frequency parts, in which one end of the inductor L1 is connected in series with the step-down circuit, and the capacitor C2 is connected in parallel between the other end of the inductor L1 and the negative input line, as shown in the figure.

[0013] The rectifier bridge DB1 performs full-wave rectification on the filtered current and outp...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/00
Inventor 吴汉肱
Owner 吴汉肱
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