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LED drive circuit and control method

A technology of LED driving and current control, applied in the direction of energy-saving control technology, electrical components, etc., can solve the problems such as the inability to balance the efficiency and power factor of the LED driving circuit

Active Publication Date: 2020-08-07
SHAANXI REACTOR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides an LED drive circuit to solve the technical problem that the efficiency and power factor cannot be balanced in the LED drive circuit due to the trade-off relationship between efficiency and power factor in the prior art

Method used

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Embodiment Construction

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0058] As mentioned in the background, in the prior art, due to the trade-off relationship between efficiency and power factor, it is impossible to balance the efficiency and power factor in the LED driving circuit.

[0059] An embodiment of the present invention provides an LED drive circuit, such as Figure 5 As shown, the circuit includes a rectification unit 101, a current control unit 102, a constant current control unit 104 and an LED load 103,

[00...

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PUM

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Abstract

The invention discloses an LED drive circuit and a control method, the circuit comprises a rectification unit, a current control unit, a constant current control unit and an LED load, the rectification unit is used for providing an input voltage; the current control unit is used for controlling the input current of the LED load according to the input voltage; the constant current control unit is used for keeping the output current of the LED load constant; a first end and a third end of the rectification unit are connected with an alternating-current power supply; a second end of the rectification unit is connected with a first end of the current control unit; a second end of the current control unit is connected with a first end of the LED load; a second end of the LED load is connected with a first end of the constant current control unit; a fourth end of the rectification unit, a third end of the current control unit and a second end of the constant current control unit are all grounded, and compensation of the power factor and the efficiency in different times is achieved through the effective control over the input current of the LED load.

Description

technical field [0001] The present application relates to the technical field of LED constant current control, and more specifically, relates to an LED driving circuit and a control method. Background technique [0002] LED is a semiconductor electronic component that can emit light. Compared with traditional light sources, LED has the advantages of high efficiency, long life, energy saving and environmental protection, and has been widely used in displays, indicator lights, indoor living lighting and outdoor landscape lighting. lighting field. [0003] Efficiency (Efficiency) refers to the ratio of the average power of the LED to the average power input by the power supply in one cycle. Low efficiency will increase the loss of the power supply. [0004] The power factor refers to the cosine value of the phase difference between the input voltage and the input current. A low power factor will increase the loss of the power grid. [0005] In the LED linear drive circuit, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/325
CPCH05B45/325Y02B20/40
Inventor 夏勤安文杰
Owner SHAANXI REACTOR MICROELECTRONICS