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Constant-input-power linear LED drive circuit

A technology of LED drive and input power, which is applied in the field of constant input power linear LED drive circuit, which can solve the problems of lower circuit efficiency, increased power consumption of field effect tubes, and chip heat dissipation burden, etc.

Inactive Publication Date: 2017-07-14
SHANGHAI ZHANKONGBI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that Vdrop increases with the increase of the input voltage, resulting in an increase in the power consumption of the field effect tube, which causes a great burden on the heat dissipation of the chip and greatly reduces the efficiency of the entire circuit.

Method used

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  • Constant-input-power linear LED drive circuit

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] Constant input power linear LED drive circuit, including: rectifier bridge, LED load, drive circuit and capacitor C.

[0042] The rectifier bridge is composed of four diodes D1, D2, D3 and D4, and the junction of the diodes D3 and D4 of the rectifier bridge is grounded. The input terminal of the rectifier bridge is connected to the input AC voltage ACin. Capacitor C is connected in parallel with the rectifier bridge.

[0043] The drive circuit includes an operational amplifier OTA, a field effect transistor M, a first bias resistor R1, a second bias resistor R2 and a current setting resistor Rcs.

[0044] The positive pole of the LED load is connected to the output terminal of the rectifier bridge, and the negative pole is connected to the drain of the field effect transistor M.

[0045] One end of the current setting resistor Rcs is ...

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Abstract

The invention provides a constant-input-power linear LED drive circuit. The constant-input-power linear LED drive circuit comprises a rectifier bridge, an LED load and a drive circuit, wherein the drive circuit comprises an operational amplifier, a field-effect tube, a first biasing resistor, a second biasing resistor and a current setting resistor; one end of the LED load is connected with the output end of the rectifier bridge, and the other end of the LED load is connected with a drain electrode of the field-effect tube; one end of the current setting resistor is connected with a source electrode of the field-effect tube; the in-phase input end of the operational amplifier is accessed to a reference voltage, and the output end of the operational amplifier is connected with a grid electrode of the field-effect tube M; one end of the first biasing resistor is connected with the output end of the rectifier bridge, and the other end of the first biasing resistor is connected with the inverted input end of the operational amplifier; one end of the second biasing resistor is connected with the source electrode of the field-effect tube, and the other end of the second biasing resistor is connected with the inverted input end of the operational amplifier. The constant-input-power linear LED drive circuit has the advantage that the efficiency of the whole machine can be greatly improved through the manner that the input current is adjusted by sensing the input voltage.

Description

technical field [0001] The invention relates to a linear LED driving circuit, in particular to a constant input power linear LED driving circuit. Background technique [0002] In recent years, high-brightness LED lighting is gradually replacing traditional light sources such as incandescent lamps and fluorescent lamps with the advantages of high luminous efficiency, long life, high reliability and no pollution. Nowadays, due to the rapid development of LED lighting, the original tens of watts of incandescent lamps can be directly replaced by LED bulb lamps of several watts, which can save a lot of energy. [0003] According to the load characteristics of the LED, a controllable constant current source is required to control it. If the rectified power frequency AC voltage is directly applied to the output LED, the problem is that constant current cannot be achieved, that is, the current through the LED is not constant throughout the power frequency cycle. Not only can't con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/395
Inventor 张义李应天
Owner SHANGHAI ZHANKONGBI ELECTRONICS TECH