Three-level cuk voltage regulation constant current source and its operation method

Abstract

The invention relates to a three-level Cuk voltage regulation constant current source and an operation method of the three-level Cuk voltage regulation constant current source, and relates to an alternating current power source realizing constant current output through feedback and adjustment of the output current. The three-level Cuk voltage regulation constant current source comprises a control part and an execution part. The control part comprises a single-chip microcomputer, a three-level Cuk voltage regulation circuit, a PID controller, keys, a 485 communication hardware circuit, a voltage zero crossing point detection circuit, a current zero crossing point detection circuit and a current instantaneous value collecting circuit. The execution part comprises a PWM signal generation circuit, an IGBT driving circuit and a displayer. The control part with the single-chip microcomputer as the core can directly and automatically detect the instantaneous value of load current and carries out logic judgment on the instantaneous value of the load current and the instantaneous value corresponding to a set value. When the instantaneous value of the load current changes, the load current can be made constant by regulating the changes of voltage, and therefore the defects that an existing constant current source is slow in constant regulation process of current, poor in stability and large in size are overcome.

Description

technical field [0001] The technical solution of the present invention relates to an AC power supply with a constant output current through feedback regulation of the output current, specifically a three-level Cuk voltage regulation constant current source and its operating method. Background technique [0002] As a power supply that provides constant current to the load in the circuit, the constant current source is one of the key components in many system circuits. Its electrical characteristics and performance directly affect the electrical characteristics of the entire system, and are used in metering, semiconductor components The calibration and performance testing of the system play a very critical role in many fields, and its accuracy and stability directly affect the operation results of the entire system. [0003] CN102185481B, CN102882389A and CN202177842U all describe the overall mechanical structure of the constant current source. The overall mechanical structur...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a three-level Cuk voltage regulating constant current source and its operating method, the control part is composed of a single-chip microcomputer, which can directly and automatically detect the instantaneous value of the load current and the instantaneous value corresponding to the set value. When the instantaneous value of the load current changes, the constant load current is realized by adjusting the voltage change, thus overcoming the slow, low stability and large volume of the current constant current source. shortcoming

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