Voltage regulation type constant current power supply based on current detection circuit

Abstract

The invention discloses a voltage regulation type constant current power supply based on a current detection circuit. The voltage regulation type constant current power supply is characterized by mainly consisting of a processing chip U, a field-effect tube MOS1, a polar capacitor C4, a diode D3, a voltage regulation circuit, a constant current drive circuit, a pulse trigger circuit and a current detector circuit, wherein the voltage regulation circuit is connected with the processing chip U; the constant current drive circuit is connected with a source electrode of the field-effect tube MOS1 and the processing chip U respectively; the pulse trigger circuit is connected with a drain electrode of the field-effect tube MOS1; and the current detection circuit is serially connected between the drain electrode of the field-effect tube MOS1 and the pulse trigger circuit. According to the voltage regulation type constant current power supply, input voltage and current can be eliminated or attenuated due to instant high voltage and instant high current generated by external electromagnetic wave interface, so that the transmission of voltage and current keeps stable dynamically, the output for stable voltage and current can be guaranteed, and normal use of electric appliances is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a voltage-regulating constant-current power supply based on a current detection circuit. Background technique [0002] With the continuous development of modern technology, there are more and more types of electrical appliances, which have become an indispensable necessity in people's lives. When people choose a certain electrical appliance, they pay more attention to whether the working performance of the electrical appliance is stable, and the stability of the electrical appliance depends on whether the output voltage and current of the power supply used by the electrical appliance are stable. However, the current power supply used by electrical appliances has the problem of unstable output voltage and current due to the interference of external electromagnetic waves. Often, the voltage and current are too high or too low, which leads to the failure of normal use of electrical applia...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of unstable output voltage and current in the power supply for electrical appliances in the prior art, and provide a voltage-adjustable constant-current power supply based on a current detection circuit

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