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LED driving circuit with power factor correction and driver

A power factor correction, LED driving technology, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., to achieve high PF value and ensure the effect of normal operation

Inactive Publication Date: 2016-10-26
刘沁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an LED drive circuit and driver with power factor correction, which solves the problem that the current technology cannot drive constant current within the full voltage range, and can realize the average current flowing through the LED under different input voltages. Constant, that is, the average current flowing through the LED is constant when the peak value of the input power supply voltage changes

Method used

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  • LED driving circuit with power factor correction and driver
  • LED driving circuit with power factor correction and driver
  • LED driving circuit with power factor correction and driver

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Embodiment 1

[0029] figure 2 A schematic structural diagram of an LED drive circuit with power factor correction provided in Embodiment 1 of the present invention, as shown in figure 2 As shown, the LED drive circuit with power factor correction provided by the embodiment of the present invention includes:

[0030] The first sub-circuit, the second sub-circuit, and the third sub-circuit; wherein,

[0031] The first sub-circuit includes a diode, an inductor, a switch tube and a current sensing resistor, the drain of the switch tube is electrically connected to the anode of the diode and the inductor respectively, and the source of the switch tube is electrically connected to the current sensing resistor;

[0032] The inductor is electrically connected to the LED array, the input power is respectively connected to the cathode of the diode and the LED array, and the first sub-circuit is used to supply power to the LED array;

[0033] The second sub-circuit includes a comparator, a logic c...

Embodiment 2

[0041] image 3 A schematic structural diagram of an LED drive circuit with power factor correction provided in Embodiment 2 of the present invention, in figure 2 Based on the illustrated embodiment, the third subcircuit also includes a reference voltage regulator, such as image 3 As shown, the divider is electrically connected to the comparator through a reference voltage regulator; the reference voltage regulator is used to control the amplitude of the reference voltage. Since the reference voltage can control the preset current upper limit in the circuit, the preset current upper limit in the circuit can be adjusted when the reference voltage is adjusted. In this embodiment, by adding a reference voltage regulator between the output terminal of the divider and the input terminal of the comparator, the magnitude of the reference voltage is controlled by the reference voltage regulator, thereby changing the preset upper limit of the current in the circuit.

[0042] Furthe...

Embodiment 3

[0053] Figure 4 A schematic structural diagram of an LED drive circuit with power factor correction provided in Embodiment 3 of the present invention, as shown in Figure 4 shown in image 3 On the basis of the shown embodiment, the input power is respectively input to the divider and the peak detector through the voltage dividing resistor. Such as Figure 4 As shown, after the input power is divided by the first resistor and the second resistor of the voltage dividing resistor, it is input to the divider and the peak detector respectively, that is, the voltage input to the divider and the peak detector at this time is Vpeak*R 1 / (R 1 +R 2 )*|sin(wt)|, where the resistance of the first resistor is R 1 , the resistance of the second resistor is R 2 , the peak voltage detected by the peak detector is Vpeak*R 1 / (R 1 +R 2 ), the reference voltage generated after the divider operation is still |sin(wt)|.

[0054] In this embodiment, by dividing the input voltage and the...

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Abstract

The invention provides an LED driving circuit with power factor correction and a driver. The LED driving circuit with power factor correction comprises a first sub circuit, a second sub circuit and a third sub circuit, wherein the first sub circuit provides power for an LED array, and comprises a diode, an inductor, a switching transistor and a current induced resistor; the second sub circuit controls on and off of the switching transistor and comprises a comparator, a logic control unit and a driver; and the third sub circuit comprises a divider and a peak detector, the peak detector detects the peak voltage of an input power supply, the divider removes the peak voltage of the input power supply to generate reference voltage, current of the current induced resistor is determined by the comparator through the reference voltage, and thus current does not change along with the peak voltage of the input power supply. The LED driving circuit solves the problem that constant current driving in a full voltage range can not be realized in the prior art, average current flowing through the LED under different input voltages can be constant, that is, the average current flowing through the LED is constant when the peak voltage of the input power supply changes is constant.

Description

technical field [0001] The embodiment of the present invention relates to an LED driving circuit, in particular to an LED driving circuit and a driver with power factor correction. Background technique [0002] Light Emitting Diode (LED for short) is a kind of high-efficiency lamps and lanterns, which have been widely used in various indications, displays, decorations, backlights, general lighting and urban night scenes and other fields. Generally, LED lamps are required to have power factor correction (Power Factor Correction, PFC for short), especially high-power LED drivers, to improve the utilization efficiency of electric energy, increase the capacity of the power system, and stabilize the current at the same time. [0003] Generally speaking, LED lamps are required to have a power factor correction function, especially a high-power LED drive circuit, in order to improve the utilization efficiency of electric energy, increase the capacity of the power system, and stabil...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00H05B45/30H05B45/355H05B45/37
CPCH05B45/37
Inventor 陈银铭
Owner 刘沁
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