LED (light emitting diode) power circuit, backlight module and liquid crystal display device
A technology of LED power supply and LED light bar, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., and can solve the problems of cost increase, efficiency reduction, and low efficiency
Inactive Publication Date: 2012-12-19
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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Problems solved by technology
Since the conversion efficiency of the DC-DC conversion circuit is only 90%, and the price is expensive, there are disadvantages of low efficiency and high cost
Among them, the DC-DC circuit has the disadvantages of reduced efficiency and increased cost
Method used
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[0022] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] like figure 2 as shown, figure 2 It is a schematic structural diagram of an LED power supply circuit in an embodiment of the present invention. The LED power supply circuit mentioned in this embodiment includes an AC-DC conversion circuit 10, a half-bridge resonant DC-DC control circuit 20, a voltage stabilization feedback circuit 30, and a current feedback circuit. Circuit 40, transformer 50, at least two LED rectification and filtering circuits 60, and at least two groups of LED light bars 70, the input end of the AC-DC conversion circuit 10 is connected to the output end of the power supply voltage, and the output end of the AC-DC conversion circuit 10 is connected to the half bridge The input end of the resonant DC-DC control circuit 20 and the two ends of the primary winding of the transformer 50 are re...
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The invention discloses an LED (light emitting diode) power circuit, a backlight module and a liquid crystal display device. The LED power circuit is characterized in that the two ends of a primary winding of a transformer are respectively connected with an anode output end and a cathode output end of a half-bridge resonant DC-DC control circuit; the two ends of a secondary winding of the transformer are respectively connected with the anodes of a group of LED strips by an LED rectifier and filter circuit; the cathode of each LED strip is connected with the input end of a current feedback circuit; the output end of the current feedback circuit is connected with the first input end of a voltage stabilizing feedback circuit; the second input end of the voltage stabilizing feedback circuit is connected with the feedback end of the LED rectifier and filter circuit; and the anode output end and the cathode output end of the voltage stabilizing feedback circuit are respectively connected with the anode feedback end and cathode feedback end of the half-bridge resonant DC-DC control circuit. The LED power circuit, the backlight module and the liquid crystal display device have the following beneficial effect: the capacitance balance method is creatively used, thus saving the DC-DC converters in the LED constant current control circuit and achieving the aims of saving energy and reducing cost.
Description
technical field [0001] The invention relates to the technical field of LEDs, in particular to an LED power supply circuit, a backlight module and a liquid crystal display device. Background technique [0002] In the existing LED power supply circuit, in order to ensure that each LED light bar can work stably with a constant current, a DC-DC conversion circuit and a constant current control circuit are usually used to supply power to the LEDs. like figure 1 as shown, figure 1 It is a schematic circuit diagram of the LED power supply circuit in the prior art. For the LED power supply with large output power, after the AC power supply voltage is input, it undergoes EMI (Electromagnetic Interference, electromagnetic interference) filtering, high-voltage rectification filtering, power correction, and half-bridge successively. The resonant topology transforms to output a DC signal, and the DC signal passes through a DC-DC conversion circuit and a constant current control circuit...
Claims
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IPC IPC(8): H05B37/02
Inventor 朱锡勤
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD