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Low-cost and high-efficiency LED string driving circuit

A technology of LED light string and driving circuit, which is applied in the direction of electric light circuit arrangement, electric light source, lighting device, etc., can solve the problems of high cost of booster circuit, increased loss, and high cost of LLC control IC, so as to reduce circuit components and increase Reliability, cost reduction effect

Active Publication Date: 2016-02-17
TPV ELECTRONICS (FUJIAN) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The energy for powering LEDLightBar is all obtained from 24V low voltage through BOOST, and this BOOST converter will increase the loss and reduce the efficiency
[0005] 2. The cost of BOOST booster circuit is relatively high
[0006] 3. The constant current source circuit used to balance the current of each LEDLightBar consumes power, making the efficiency lower
[0007] 4. The cost of dedicated LLC control IC is high

Method used

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  • Low-cost and high-efficiency LED string driving circuit
  • Low-cost and high-efficiency LED string driving circuit
  • Low-cost and high-efficiency LED string driving circuit

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and related drawings.

[0036] The present invention provides a low-cost and high-efficiency LED lamp string driving circuit, which includes an LLC converter control circuit, and is characterized in that: the output end of the LLC converter control circuit is connected to the input end of a LLC converter main circuit circuit; The output end of the main loop circuit of the LLC converter is connected to the input end of an LED light string voltage difference balancing circuit, and a first output end of the LED light string voltage difference balancing circuit is connected to a first output end of the LLC converter control circuit. An input end, a second output end of the LED light string voltage difference balancing circuit is connected to an LED light string circuit; an output end of t...

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PUM

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Abstract

The invention relates to a low-cost and high-efficiency light-emitting diode (LED) lamp string driving circuit. The low-cost and high-efficiency LED lamp string driving circuit comprises a logical link control (LLC) convertor control circuit and is characterized in that an output end of the LLC convertor control circuit is connected with an input end of an LLC convertor main return circuit; an output end of the LLC convertor main return circuit is connected with an input end of an LED lamp string voltage difference balancing circuit, a first output end of the LED lamp string voltage difference balancing circuit is connected with a first input end of the LLC convertor control circuit, a second output end of the LED lamp string voltage difference balancing circuit is connected with an LED lamp string circuit, and an output end of the LED lamp string is connected with a second input end of the LLC convertor control circuit. The low-cost and high-efficiency LED lamp string driving circuit improves efficiency of a backlight driver and lowers manufacture cost of the backlight driver.

Description

technical field [0001] The invention relates to a low-cost and high-efficiency LED lamp string driving circuit. Background technique [0002] Such as figure 1 As shown, the current LCD TV LEDLightBar drive circuit basically uses a dedicated LLC control IC to make an LLC converter, converts the BUS voltage output by the PFC into a 24V output, and then passes through a BOOST converter to boost the voltage. The voltage rises from 24V to a voltage slightly higher than that of the LEDLightBar, and connects the positive pole of each LEDLightBar string to supply power to the LEDLightBar string; the negative terminal of each LEDLightBar string is connected to a constant current source. [0003] Existing technology has following shortcoming: [0004] 1. The energy for powering LEDLightBar is all obtained from 24V low voltage through BOOST, and this BOOST converter will increase losses and reduce efficiency. [0005] 2. The cost of BOOST booster circuit is relatively high. [0006...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 王星光
Owner TPV ELECTRONICS (FUJIAN) CO LTD
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