Real-time compensation apparatus for input voltage fluctuation in power LED driving system
A technology of LED driving and input voltage, applied in lighting devices, circuit layout, lamp circuit layout, etc., can solve the problems of driving current fluctuation, unable to eliminate input voltage fluctuation in real time, etc., to achieve stable output current, stable and consistent power LED current output , the effect of fast and efficient adjustment
Inactive Publication Date: 2011-12-28
SUZHOU ZHIPU XINLIAN ELECTRONICS TECH
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[0004] The present invention provides a real-time compensation device for input voltage fluctuations in a power LED drive system, aiming at that system feedback encountered in a power LED drive system cannot eliminate input voltage fluctuations in real time, thus causing fluctuations in the drive current of power LEDs during the feedback adjustment period problem, the real-time compensation device monitors the input voltage of the drive system in real time and introduces the change component of the input voltage into the error amplifier of the system for operation, and adjusts the output voltage of the error amplifier in real time to compensate for the fluctuation of the input voltage in real time. Influenced by the drive current, a more stable and consistent brightness output can be obtained
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[0017] A real-time compensation device for input voltage fluctuations in a power LED drive system, comprising: 220V mains input circuit 1, PWM signal generation circuit 3, output drive circuit 4, power LED load circuit 5 and feedback sampling circuit 6, PWM signal generation The output terminal of the circuit 3 is connected with the input terminal of the output driving circuit 4, the output terminal of the output driving circuit 4 is connected with the input terminal of the power LED load circuit 5, and the output driving circuit 4 amplifies the PWM signal from the PWM signal generating circuit 3 and Form drive signal, output to power LED load circuit 5, be used to drive power LED load circuit 5, described feedback sampling circuit 6 is used for collecting the load current fluctuation signal of power LED load circuit 5, it is characterized in that, in 220V mains An error processing circuit 2 is arranged between the input circuit 1 and the PWM signal generating circuit 3, and th...
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The invention relates to a real time compensating mechanism towards input voltage hunting in a power LED drive system. The real time compensating mechanism comprises a commercial power input circuit, a PWM signal generating circuit, an output drive circuit, a power LED load circuit and a feedback sampling circuit. The output drive circuit amplifies a PWM signal from the PWM signal generating circuit and forms a drive signal. The feedback sampling circuit samples a load current fluctuation signal of the power LED load circuit. An error treatment circuit is arranged between the commercial power input circuit and the PWM signal generating circuit and comprises an input voltage detection circuit and an error amplifying circuit. The input voltage detection circuit is used for collecting output signals of the commercial power input circuit. An output end of the input voltage detection circuit is connected with a first input end of the error amplifying circuit, and a second input end of the error amplifying circuit is connected with the output end of the feedback sampling circuit. The output end of the error amplifying circuit is connected with an input end of the PWM signal generating circuit.
Description
technical field [0001] The invention relates to a real-time compensation device for input voltage fluctuations in a power LED drive system to eliminate the influence of input voltage fluctuations on output current. It has special significance for power LED loads that require strict output current accuracy, and can obtain more stable Consistent light output. Background technique [0002] Since the "energy crisis" in the 1970s, governments around the world have been vigorously promoting energy-saving and high-efficiency projects and products, and one of the important promotion areas is lighting and display systems. Since the 1980s, the invention and research of LED has greatly expanded the application field of LED since the 1990s, which has accelerated the pace of LED lighting application. At present, street lighting in domestic cities has already applied power LED lighting technology. [0003] But one of the main problems accompanying the application of power LED lighting is...
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IPC IPC(8): H05B37/02F21Y101/02F21V23/00F21Y115/10
CPCY02B20/42Y02B20/40
Inventor 陈畅陈瑶杨全
Owner SUZHOU ZHIPU XINLIAN ELECTRONICS TECH