Linear LED drive circuit with high power factor

A technology of LED drive and high power factor, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of current harmonics and reactive power polluting the power grid, complex scheme, poor reliability, etc., to reduce pollution and improve Reliability, the effect of high reliability

Active Publication Date: 2016-02-03
广州市力驰微电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the LED lighting scheme is mainly connected to the power grid through a rectifier, which will generate a large number of current harmonics and reactive power in the grid, which will pollute the grid and become a public hazard of electricity, and the scheme is complicated and has poor reliability.

Method used

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  • Linear LED drive circuit with high power factor
  • Linear LED drive circuit with high power factor
  • Linear LED drive circuit with high power factor

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, the LED lighting driving circuit of the present invention includes 4 N-type high-voltage tubes, 5 resistors, 1 Zener diode, 3 high-voltage light-emitting diodes, 2 comparators, 1 transconductance operational amplifier, and 1 control logic The circuit and the number of light-emitting diodes can also be designed according to actual conditions.

[0018] The base of the first N-type high-voltage tube MN1 and one end of the resistor R1 are connected to the cathode of the zeroth diode D0; the source of the first N-type high-voltage tube MN1 and one end of the resistor R2 are connected to the output port VDD; the second N-type The grid of the high-voltage tube MN2, the grid of the third N-type high-voltage tube MN3, the output terminal of the first comparator COMP1, and the output terminal of the second comparator COMP2 are connected to th...

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Abstract

The invention discloses a linear LED drive circuit with a high power factor. The linear LED drive circuit with the high power factor is characterized by comprising four N type high-voltage tubes, five resistors, a Zener diode, three high-voltage LEDs, two comparators, an operational transconductance amplifier, a control logic circuit and a circuit connecting structure thereof, wherein the second N type high-voltage tube MN2, the third N type high-voltage tube MN3 and the fourth N type high-voltage tube MN4, the first comparator, the second comparator and the operational transconductance amplifier are used for controlling the luminance and non-luminance of the first LED, the second LED and the third LED according to the input voltage level; and the first N type high-voltage tube MN1 is arranged in a high-voltage starting circuit integrated in the internal of the LED drive circuit. According to the linear LED drive circuit with the high power factor, the PFC factor of an illuminating system is improved, the pollution of the illuminating system on the power gird is reduced, and the reliability of the illuminating system is improved, so that the linear LED drive circuit is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of semiconductor lighting driving circuits, specifically a linear LED driving circuit with high power factor, which is mainly used in semiconductor lighting driving technologies such as landscape lighting and indoor lighting within the power range of 3W to 18W. Background technique [0002] LED light source is the fourth generation of lighting source. It has the advantages of energy saving, environmental protection, safety, and long life. It has been widely used in various indications, displays, decorations, backlights, general lighting, and urban night scenes. With the gradual reduction of cost, LED lighting will gradually replace traditional lighting and become the mainstream lighting fixture. At present, the LED lighting scheme is mainly connected to the power grid through a rectifier, which will generate a large number of current harmonics and reactive power in the power grid, polluting the power grid, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 林美玉王晓飞
Owner 广州市力驰微电子科技有限公司
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