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Light-emitting diode (LED) linear current control circuit and LED linear circuit

A technology of controlling circuit and linear current, applied in the direction of electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problems of increasing power consumption of constant current control circuit, reducing the efficiency of driving circuit, increasing the temperature rise of driving circuit, etc., so as to improve the utilization rate. rate, increase the total output lumens, increase the effect of power factor

Inactive Publication Date: 2012-07-18
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the number of LED lights in series is reduced, although the utilization rate of LEDs can be increased, the power consumption of the constant current control circuit will be greatly increased, thereby reducing the efficiency of the entire driving circuit and increasing the temperature rise of the driving circuit.
If you increase the current when the LED light is on, although the brightness of the LED can be improved, you need to use a higher power LED, which increases the cost of the system, and the power consumption of the system will also increase with the increase of the LED drive current.

Method used

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  • Light-emitting diode (LED) linear current control circuit and LED linear circuit
  • Light-emitting diode (LED) linear current control circuit and LED linear circuit
  • Light-emitting diode (LED) linear current control circuit and LED linear circuit

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Embodiment Construction

[0014] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] In the traditional LED linear constant current control circuit, the LED light string will only be lit when the input voltage reaches the peak value.

[0016] The invention provides an LED linear current control circuit, which can light up some LEDs when the input voltage is low, thereby improving the utilization rate of the LEDs. In order to achieve the purpose of the invention, a LED linear current control circuit is characterized in that it includes: an LED current sampling network for sampling the current of the LED to obtain a sampling voltage; a comparison and control circuit for sampling according to the sampling network obtained The voltage and a reference voltage output a comparison result; a multi-way selection switch is used to control the conduction impedance of the multi-way selection switch according to the comparison resul...

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Abstract

The invention discloses a light-emitting diode (LED) linear current control circuit. The LED linear current control circuit comprises an LED lamp string, an input voltage sampling network, a comparison and control circuit and a multi-path selection switch, wherein the LED lamp string is formed by connecting at least one LED in series; the input voltage sampling network is used for sampling the input voltage of the LEDs; the comparison and control circuit compares the input voltage of each LED with a reference voltage to obtain a comparison result; and the multi-path selection switch is respectively connected to the LEDs and changes conduction impedance according to the comparison result so as to control the conduction of a part of the LEDs or all the LEDs. The invention also discloses an LED linear circuit.

Description

technical field [0001] The invention relates to an LED linear current control circuit, in particular to a linear current control circuit which can adjust the brightness of the LED by changing the phase-cut angle of the input thyristor dimmer. Background technique [0002] figure 1 It is a traditional LED linear constant current control circuit. In the figure, the LED light string is connected to the positive terminal of the input rectifier bridge 100 , and the current flowing through the LEDs is set by a linear constant current source 102 connected to the ground terminal of the input rectifier bridge 100 . The positions of the LED 200 and the linear constant current source 102 can be interchanged. [0003] Since the LED light string is composed of many LEDs 200 connected in series, the forward voltage is very high. According to the principle of LED conduction, the LED light string will be lit only when the input voltage is higher than the forward conduction voltage of LED...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 胡黎强
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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