LED (light emitting diode) driver
An LED driver and driving current technology, applied in lighting devices, light sources, electric light sources, etc., can solve problems such as affecting the output current accuracy and linear/load regulation rate, excessive total harmonic distortion of the driving circuit, and reducing the system power factor. , to achieve the effect of improving accuracy and linear/load regulation, avoiding interference with grid voltage, and reducing total harmonic distortion
Active Publication Date: 2014-01-22
FREMONT MICRO DEVICES SHENZHEN LTD
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Problems solved by technology
[0006] (1) The driver of this structure needs to sample the peak current. The delay of sampling and the change of input voltage or power inductance will bring errors, which will affect the accuracy of output current and linear / load regulation;
[0007] (2) The input current in the AC voltage input terminal of the driver with this structure contains high-order harmonic components, which will cause excessive total harmonic distortion of the drive circuit, interfere with the grid voltage, and increase the power consumption of the system at the same time. power factor;
[0008] (3) There must be 4 external resistors (R2, R3 and R5, R6) in the driver for ZCD detection and VIN detection respectively, and the controller also needs the ZCD terminal and MT terminal accordingly, which increases the circuit board. area, increasing the cost
Method used
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[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0035] image 3 It is the circuit diagram of the LED driver provided by the preferred embodiment of the present invention. Such as image 3 As shown, a LED driver provided by the present invention includes: an AC input terminal for inputting an AC power supply voltage; a rectifier circuit 301 connected to the AC input terminal for converting the input AC power supply voltage into a half-wave AC voltage; The switching element is connected with the rectification circuit 301, and is used for rectifying and filtering the half-wave AC voltage output by the rectification circuit 301, and generating and outputting the output of driving current for driving the LED under the drive of the rectified and filtered half-wave AC volt...
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The invention discloses an LED (light emitting diode) driver, which relates to the field of a power supply driving circuit. A power inductor and an output rectifying filter circuit are arranged below a controller; a sampling resistor Rcs is arranged on the position connected with an LED lamp bead in series; current Ics output after flowing through the sampling resistor is caused to be equal to feedback current in an input feedback control circuit; therefore, the controller can obtain high-precision output current via closed loop negative feedback to improve the linear / load regulation ratio of output current; in addition, the structure adopted by the driver can be used for reducing the higher harmonic component of input current in an alternating current input end; the total harmonic distortion of the system is lowered; meanwhile, the system is simplified; the system cost is reduced.
Description
technical field [0001] The invention relates to the field of power drive circuits, more specifically, to an LED driver. Background technique [0002] Since the non-isolated LED (Light-Emitting Diode, light-emitting diode) driver has the advantages of low cost and simple system, its application in various AC-DC (Alternating Current-Direct Current, AC-DC power supply) lighting products has attracted attention. More and more attention. As energy conservation and environmental protection are increasingly concerned around the world, people's requirements for power factor and total harmonic distortion of various power supply products, including LED lighting products, are also increasing. Reducing total harmonic distortion in modern power supply products, including LED It is of great significance in the application of lighting products. [0003] The circuit diagram of a traditional non-isolated LED driver is shown in figure 1 shown. The driver includes an AC input terminal, a r...
Claims
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Inventor 黄裕泉李进张利刚
Owner FREMONT MICRO DEVICES SHENZHEN LTD