Variable frequency constant-current control method for LED drive system based on switched capacitor converter

Abstract

The invention discloses a variable frequency constant-current control method for an LED drive system based on a switched capacitor converter, and the method comprises the steps: taking a current Ich of a capacitor CS of the LED drive system based on the switched capacitor converter in a charging circuit as an integration input quantity, and inputting the integration input quantity into a resettable integrator; feeding back a given output current reference quantity Iref of the LED drive system based on the switched capacitor converter in the charging circuit and the whole output current Io of the LED drive system based on the switched capacitor converter to an adder-subtractor for difference solving; enabling an output signal of the adder-subtractor and an output signal of the resettable integrator to be transmitted to a comparator for comparison, and then transmitting the output signals to a D trigger, and then to a monostable multi-harmonic oscillator; enabling a signal outputted by the monostable multi-harmonic oscillator to pass through an output drive signal amplification circuit for driving a switching tube S1 and a switching tube S2 to operate, thereby achieving the constant-current output purpose and increasing the dynamic response speed of the LED drive 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 increasingly widespread application of smart electronic products and the development of other electronic technologies, LEDs have been used in 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 requires higher performance. Due to the advantages of high luminous efficiency and long 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 great impact on the LED. With the development of electronic technolo...

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.

Images