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A led constant current control circuit with input voltage sampling and compensation

A technology of constant current control circuit and input voltage, which is applied in the direction of electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problem of low current accuracy, and achieve the effect of simple sampling circuit

Inactive Publication Date: 2011-12-21
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It can be seen that the output current in the traditional peak current control LED drive circuit is greatly affected by the input voltage, and the current accuracy is low

Method used

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  • A led constant current control circuit with input voltage sampling and compensation
  • A led constant current control circuit with input voltage sampling and compensation
  • A led constant current control circuit with input voltage sampling and compensation

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below with reference to the drawings. In order to facilitate the description and highlight the present invention, a detailed description of the same circuit parts as in the prior art will be omitted.

[0026] The present invention provides an LED constant current control circuit with input voltage sampling and compensation, which is characterized by comprising a transformer, an input voltage sampling compensation module and a switch tube. The input voltage sampling compensation module is connected to the switch tube and the transformer. The input voltage sampling compensation module samples the input voltage, and changes the peak current of the main winding of the transformer according to the sampling signal.

[0027] image 3 It is an LED drive circuit with an input voltage sampling conversion compensation unit according to the first embodiment of the present invention. Such as image 3 As shown in t...

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Abstract

The invention opens an LED constant current control circuit with input voltage sampling and compensation, including transformers, input voltage sampling compensation modules, and switch tube. The input voltage sampling compensation module is connected to the switch tube to the transformer.The module samples the input voltage and changes the peak current of the main winding of the transformer based on the sampling signal.The present invention also discloses an LED constant current control method with input voltage sampling and compensation.

Description

Technical field [0001] The invention relates to a switching power supply control method, such as an LED drive power supply, and more particularly to an LED constant current control circuit and method for sampling and compensating input voltage. Background technique [0002] The peak current control method is widely used in LED drive to achieve constant current output. However, due to the delay of the peak current control part, the peak sampling accuracy is low, which makes the output constant current effect poor. [0003] The traditional peak current control LED drive circuit includes a transformer, a switch tube, an inductor current sampling unit and an output switch tube control unit. [0004] figure 1 It is a traditional LED drive circuit that uses peak current control to achieve constant current output. Such as figure 1 As shown, the resistors Rf1, Rfh, Rs, Vr, and the comparator constitute a peak current sampling pole compensation circuit. Rfh, Rhl, Control & Drive constitute...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 胡黎强张义于得水
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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