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LED linear constant current control circuit and LED linear circuit

A control circuit, linear constant current technology, applied in the direction of lamp circuit layout, electric light sources, lighting devices, etc., can solve the problems of increased power consumption of constant current control circuits, reduced drive circuit efficiency, increased drive circuit temperature rise, etc., to achieve improved Utilization, increase the total output lumens, increase the effect of power factor

Inactive Publication Date: 2012-06-13
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • 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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  • LED linear constant current control circuit and LED linear circuit
  • LED linear constant current control circuit and LED linear circuit
  • LED linear constant 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 constant 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 constant current control circuit is characterized in that it includes: an input voltage sampling network for sampling the input voltage; a comparison and logic control circuit, based on the sampling voltage of the input voltage sampling network and a Threshold voltage outputs a comparison result; a multi-way selector switch is used to turn on all or part of the LEDs according to the comparison result. According to different input voltages,...

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Abstract

The invention discloses an LED linear constant current control circuit. The LED linear constant current control circuit comprises: an input voltage sampling network, which is used for carrying out sampling on an input voltage; a comparison and logic control circuit, which is used for outputting a comparison result according to a sampling voltage of the input voltage sampling network and a threshold voltage; and a multipath selection switch, which is used for controlling a portion of or whole LED conduction according to the comparison result. In addition, the LED linear constant current control circuit also includes a current control loop, which is used for controlling currents flowing through the LED. Meanwhile, the invention discloses an LED linear circuit.

Description

technical field [0001] The invention relates to an LED linear constant current control circuit, in particular to a linear constant 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 conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 胡黎强
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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