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LED (light-emitting diode) driving circuit and method for balancing efficiency and power factor

A technology of LED drive and power factor, which is applied in the field of circuit design, can solve the problems that efficiency and power factor cannot be optimized at the same time, and achieve the effects of optimizing electromagnetic interference performance, simplifying peripheral circuits, and high efficiency

Active Publication Date: 2017-12-29
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an LED drive circuit and method with balanced efficiency and power factor, which is used to solve the problem that the efficiency and power factor cannot be optimized simultaneously in the prior art

Method used

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  • LED (light-emitting diode) driving circuit and method for balancing efficiency and power factor
  • LED (light-emitting diode) driving circuit and method for balancing efficiency and power factor
  • LED (light-emitting diode) driving circuit and method for balancing efficiency and power factor

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Embodiment 1

[0050] Such as Figure 4 As shown, the present invention provides a LED drive circuit 1 with balanced efficiency and power factor, and the LED drive circuit 1 with balanced efficiency and power factor at least includes:

[0051] A voltage input module 11 , an LED load 12 , a constant current control module 13 , a current cut-off slope control module 14 and an operating voltage generation circuit 15 .

[0052] Such as Figure 4 As shown, the voltage input module 11 is used to provide the input voltage V IN _ac.

[0053] Specifically, such as Figure 4 As shown, the voltage input module 11 is an external chip device, including an AC power supply AC, a fuse F1 and a rectification unit, the rectification unit includes two parallel diode groups, each diode group includes two diodes connected in series, The AC power supply AC is connected between two diodes of each diode group through the fuse F1, and the voltage input module 11 provides the input voltage V IN _ac, the input vo...

Embodiment 2

[0067] Such as Figure 5 As shown, the present invention provides an LED driving circuit with balanced efficiency and power factor. Sampling the voltage Vcs, realizing the control of the average current in the AC cycle by integrating the compensation capacitor Ccomp, and limiting the peak current to achieve constant power output within a wide input voltage range; at the same time receiving the shutdown signal, when the shutdown signal starts The current flowing through the LED load is effectively shut off, thereby reducing power consumption.

[0068] Specifically, such as Figure 5As shown, the first reference voltage generating unit 131 is an internal device of the chip, connected to the sampling resistor Rcs and a compensation capacitor Ccomp, and the compensation capacitor Ccomp is an external device of the chip, and the compensation capacitor and the first compensation capacitor are realized through the COMP port. The connection of the reference voltage generation unit 1...

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Abstract

The present invention provides an LED (light-emitting diode) driving circuit and method for balancing efficiency and a power factor. The LED (light-emitting diode) driving circuit comprises a voltage input module, an LED load, a constant current control module and a current turn-off slope control module which adjusts the turn-off slope of current flowing through the LED load so as to realize the balance of the efficiency and the power factor; when an input voltage is greater than a set voltage, the current flowing through the LED load is turned off, and therefore, power consumption can be reduced; and the efficiency and the power factor are balanced through adjusting the turn-off slope of the current. According to the LED (light-emitting diode) driving circuit and method for balancing the efficiency and power factor of the invention, the control of average current in alternating current cycles is realized through a compensation capacitor, and peak current is limited, and therefore, constant power output in a wide input voltage range can be realized; and the turn-off voltage and turn-off slope of the LED are adjusted through an external resistor, and therefore, the balance of the efficiency and power factor of a system can be realized, and the electromagnetic interference performance of the system can be optimized.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to an LED driving circuit and method for balancing efficiency and power factor. Background technique [0002] LED is a semiconductor electronic component that can emit light. This electronic component can only emit red light with low luminosity in the early days. With the continuous advancement of technology, it has now developed to the extent that it can emit visible light, infrared rays and ultraviolet rays. Big improvement. LED has the advantages of high efficiency, long life, unbreakable, high switching speed, high reliability, etc. that traditional light sources cannot match, and has been widely used in the fields of indicator lights, displays and lighting. [0003] The power factor (PF) refers to the cosine value of the phase difference between the input voltage and the input current. A low power factor will increase the loss of the power grid. Efficiency (EFF) is the ratio of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37H05B45/355H05B45/00H05B45/395H05B45/46H05B45/48Y02B20/30
Inventor 刘军吴泉清卢圣晟李国成
Owner CRM ICBG (WUXI) CO LTD