Circuit structure and method for realizing precise constant current output control

Abstract

The invention relates to a circuit structure and method for achieving accurate constant-current output control. The circuit structure comprises a Hall device, a voltage comparator and a voltage controller. The Hall device is used for detecting load current in real time and converting the load current into load voltage signal output. The voltage comparator is used for comparing load voltage detected through the Hall device with reference voltage and outputting a comparative result. The voltage controller is used for controlling the power supply value of a load according to the comparative result of the voltage comparator. The voltage controller comprises a field-effect transistor and a duty ratio control unit. According to the circuit structure and method for achieving the accurate constant-current output control, by the adoption of the structure, a brand-new constant current source control scheme is provided, and therefore high-accuracy current control is achieved. The load current is detected through the introduced Hall device, so that a closed circuit is formed to achieve constant-current control. Adjustment is performed according to deviation between the magnitude of the actual output current and a target value, so that the purpose of constant-current output is achieved. Besides, the circuit structure is simple, application is convenient, and the application range is wider.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to the field of control technology of a constant current output circuit, and specifically refers to a circuit structure and method for realizing precise constant current output control. Background technique [0002] With the improvement of people's living standards and the advancement of electronic technology, people have increasingly stringent requirements for the performance of electronic equipment, such as the output accuracy of constant current sources: in high-precision instruments, various standard lamps, battery chargers, automatic instruments , LEDs used for display backlight drive, etc., the output accuracy of the constant current source is facing severe challenges. The constant current accuracy of traditional constant current drive schemes in mass production is usually within 5%, and even better may be within 3%, but this is still far from meeting the growth of...

AI Technical Summary

Problems solved by technology

The constant current accuracy of the traditional constant current drive scheme in mass production is usually within 5%, and even better may be within 3%, but this is far from meeting the growth of demand

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