Frequency conversion and constant current control method of LED drive system based on switched capacitor converter

Abstract

The invention discloses a frequency conversion and constant current control method of an LED drive system based on a switched capacitor converter. The capacitor C in the charging circuit of the LED drive system based on a switched capacitor converter S current I ch As the integral input quantity of , it is sent to the resettable integrator, and the LED drive system based on the switched capacitor converter is given the output current reference quantity I in the discharge circuit ref The overall output current I of the LED drive system based on the switched capacitor converter o Feedback to the adder-subtractor for difference, the output signal of the adder-subtractor and the output signal of the resettable integrator are sent to the comparator for comparison and then sent to the D flip-flop, and then enter the monostable multivibrator, The signal output from the monostable multivibrator is then passed through the output drive signal amplification circuit to drive the switch tube S 1 and switch tube S 2 , so as to achieve the purpose of constant current output, and improve the dynamic response speed of the LED driving system based on the switched capacitor converter.

Description

Technical field [0001] The invention belongs to the technical field of nonlinear control methods, and relates to a variable frequency constant current control method of an LED drive system based on a switched capacitor converter. Background technique [0002] With the more and more widespread application of smart electronic products and the development of other electronic technologies, LEDs have been applied to the lighting field on a certain scale (such as street lighting, home lighting, electric vehicle lighting systems, etc.), and some advanced products require more and more functions The more, so the LED lighting system needs higher performance. Due to the advantages of higher luminous efficiency and longer life, LED has been widely used in domestic or international automation industry, industry and public facilities. The performance of the LED mainly depends on the driver, and its performance will have a very large impact on the LED. With the development of electronic tech...

AI Technical Summary

Problems solved by technology

However, using these traditional control methods, the switched capacitor converter has the disadvantages of slow dynamic response, narrow input voltage and output power range, and unstable output voltage. In addition, these control methods are mainly to realize the constant voltage control method of the switched capacitor converter.

The constant current control method is beneficial to prolong the life of LED lamps and improve the power conversion efficiency. For the constant current control method of the switched capacitor converter, there is no reference in the existing literature and practical applications.

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