Discharge circuit with constant voltage and constant current

Abstract

The invention relates to a discharge circuit with a constant voltage and a constant current. An input end of a power inductor is connected with a power supply input end; a switching control end of a switching circuit is connected with a control chip, one switching connection end of the switching circuit is connected with an output end of the power inductor, and the other switching connection end of the switching circuit is grounded; an anode of a freewheel diode is connected with the output end of the power inductor and a cathode of the freewheel diode forms a power supply output end; a sampling connection end of a voltage sampling circuit is connected with the power supply output end, and a sampling output end of the voltage sampling circuit is connected to the control chip; one end of acurrent sampling resistor is grounded, and the other end of the current sampling resistor is connected with an output end of an Atmosphere Pressure Glow Discharge (APGD) excitation source; a first comparison signal input end of a comparison feedback circuit is connected to the other end of the current sampling resistor, a second comparison signal input end of the comparison feedback circuit is connected with a reference voltage, and a feedback signal output end of the comparison feedback circuit is connected to the control chip; and the control chip respectively implements negative feedback regulation of the voltage and the current according to sizes of signals transmitted by the voltage sampling circuit and the comparison feedback circuit. The discharge circuit disclosed by the inventionis stable in discharge voltage and current and small in time delay in the discharging process.

Description

technical field [0001] The invention relates to the field of discharge, and more specifically relates to a discharge circuit with constant voltage and constant current. Background technique [0002] The problems brought about by the rapid economic development are also serious. The most closely related to the common people is environmental pollution, which has seriously affected people's daily life. Among all environmental problems, water pollution is a very difficult one. Steel plants, aluminum plants, power plants, fertilizer plants, etc. in various places will produce a lot of waste water during the production process. These wastewater often contain heavy metal elements, only a small part is treated, and most of them are directly discharged into rivers or underground, polluting fresh water, groundwater and soil, seriously affecting the growth of animals and plants and people's health. Therefore, effective monitoring and treatment of heavy metal pollution in water is urge...

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a constant voltage and constant current discharge device for the technical defects of unstable output current, poor real-time performance and no leakage protection function proposed in the above two working modes in the prior art. circuit

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