Multi-channel multi-level digital AC constant current source and its adjustment and gate control method

Abstract

The invention discloses a multi-channel multi-level digital AC constant current source and its shifting and gating control method, and relates to the technical field of constant current sources. The multi-channel multi-level digital AC constant current source includes sequentially connected micro Control unit MCU module, signal generator, signal processing module, four-way amplifier circuit, shifting circuit, high-precision operational amplifier module and four-way gating circuit; the control signal output end of the MCU module is connected to the shifting circuit and the control signal input terminals of the four-way gating circuit. Compared with the prior art, the present invention directly utilizes the signal generator to generate the sinusoidal AC signal without transformer and spwm conversion, so no harmonics will be generated. In addition, the whole scheme is simple in principle, uses fewer components, and is less expensive and difficult to generate. error occured.

Description

technical field [0001] The invention relates to the technical field of constant current sources, in particular to a multi-channel multi-speed digital AC constant current source and a method for adjusting gears and gating control thereof. Background technique [0002] At present, in the debugging and development of many products carried out by the factory, multiple high-precision 0-100mA standard constant current signal sources are often used. In the molding products of multi-channel constant current signal sources, the current market only has analog single-channel signal sources, and there is no fully digital multi-channel constant current source. In the test, if multiple standard constant current signal sources are required for debugging, then several single signal source devices must be used to meet the test requirements, and most of the analog signal sources currently used are constant current signals adjusted by potentiometers. Although the source is relatively simple, ...

AI Technical Summary

Problems solved by technology

This circuit will generate a large number of harmonics to feed back to the power grid, which is likely to interfere with the normal operation of electronic products, and in the process of use, the user needs to set the current value through the MCU (Micro Control Unit, micro control unit), the hardware of the entire constant current source The circuit requires more components, the cost is higher, and it is prone to failure

[0004] To sum up, the current constant current sources on the market have the following problems: the accuracy of the analog constant current source is not high, and the AC constant current source is likely to generate harmonics and feed back to the power grid, causing the power grid to be unstable, and the cost is high, and it is prone to failure

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