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Single-segment linear constant-power LED (light-emitting diode) driving circuit and method

A technology of LED drive and constant power, which is applied in the field of single-segment linear constant power LED drive circuit, which can solve the problems of narrow input voltage range and low efficiency, and achieve the effect of the most simplified, high-efficiency, and highly integrated peripheral circuits

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

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a single-segment linear constant power LED drive circuit and method for solving the problem of narrow input voltage range and low efficiency in single-segment linear LED drive in the prior art. question

Method used

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  • Single-segment linear constant-power LED (light-emitting diode) driving circuit and method
  • Single-segment linear constant-power LED (light-emitting diode) driving circuit and method
  • Single-segment linear constant-power LED (light-emitting diode) driving circuit and method

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Embodiment 1

[0051] Such as figure 2 As shown, the present invention provides a single-segment linear constant power LED drive circuit 1, the single-segment linear constant power LED drive circuit 1 at least includes:

[0052] Voltage input module 11 , LED load 12 , power switch tube M, sampling resistor Rcs, current control module 13 , comparison module 14 , overvoltage control module 15 and working voltage generation circuit 16 .

[0053] Such as figure 2 As shown, the voltage input module 11 is used to provide the input voltage V IN _ac.

[0054] Specifically, such as figure 2 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 ...

Embodiment 2

[0070] Such as image 3 As shown, the present invention provides a single-segment linear constant power LED drive circuit, the structure of which is basically the same as that of Embodiment 1, the difference is that the overvoltage control module 15 also includes a constant current source I1 to adjust the current flow through The turn-off slope of the current of the LED load 12 further reduces electromagnetic interference and optimizes circuit performance.

[0071] Specifically, such as image 3 As shown, the overvoltage control module 15 includes a first resistor R1 , a second resistor R2 , a constant current source I1 and an overvoltage detection unit 151 . In this embodiment, the first resistor R1 and the second resistor R2 are external devices on the chip, and the constant current source I1 and the overvoltage detection unit 151 are on-chip devices. One end of the first resistor R1 is connected to the drain terminal S1 of the power switch tube M, the other end is connect...

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Abstract

The present invention provides a single-segment linear constant-power LED (light-emitting diode) driving circuit and a method. The circuit includes a voltage input module, an LED load, a power switching tube, a sampling resistor, an overvoltage control module which is used for detecting the drain-end voltage of the power switching tube, a current control module which is used for limiting the peak current of the LED load, and a comparison module. According to the single-segment linear constant-power LED (light-emitting diode) driving circuit and the method, when input voltage is larger than the conduction voltage of the LED load, the current control module limits the peak current, so that a current average value in different input voltage periods can be constant; when the input voltage is larger than a set value, current flowing through the LED load is turned off, and therefore, power consumption can be decreased; and when the input voltage is smaller than the conduction voltage of the LED load, the LED load is turned off. According to the single-segment linear constant-power LED (light-emitting diode) driving circuit and the method of the invention, the control of average current in alternating current periods is realized by using a compensation capacitor, the peak current is limited, and therefore, constant power output in a wide input voltage range is realized; and the turn-off voltage and turn-off slope of the LED are adjusted through an external resistor, and therefore, the high efficiency of the 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 a single-segment linear constant power LED driving circuit and method. 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] Usually, the overall efficiency of a single-segment linear LED driver is determined by the LED conduction voltage and the input voltage, which satisfy the following relationship: [0004] Such as figure 1 Shown is a com...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/395Y02B20/30H05B47/24H05B45/14
Inventor 刘军吴泉清李国成
Owner CRM ICBG (WUXI) CO LTD
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