High-precision voltage regulation type constant current source system suitable for strong inductive load

Abstract

The invention discloses a high-precision voltage regulation type constant current source system suitable for a strong inductive load. The high-precision voltage regulation type constant current sourcesystem comprises an MCU, an AD / DA module, a switching power supply, a constant current source circuit, a compensation capacitor C and a feedback divider resistor. The MCU is connected with the DA module and is used for generating a reference voltage signal; the DA module is connected with the constant current source circuit and is used for converting the reference voltage signal into a current signal through the constant current source circuit; the constant current source circuit is internally provided with a high-precision sampling resistor connected with the AD module, and is used for converting the current signal into a measurement voltage signal through the high-precision sampling resistor and sending the measurement voltage signal to the AD module for analog-to-digital conversion; the compensation capacitor C is respectively connected with the switching power supply, the constant current source circuit and the feedback divider resistor and is used for compensating the phase of aloop formed by the switching power supply, the constant current source circuit and the feedback divider resistor; and the switching power supply is connected with the feedback divider resistor, the switching power supply is connected with the constant current source circuit, and the switching circuit maintains the source voltage of a constant current source circuit adjusting tube to be constant through the feedback divider resistor.

Description

technical field [0001] The invention belongs to the technical field of DC motor drivers, and in particular relates to a high-precision voltage-regulating constant-current source system suitable for strong inductive loads. Background technique [0002] In the field of industrial control, the accuracy and stability of the constant current source are the key to the performance of the measurement system. In the future, high-performance programmable constant current sources will be more and more widely used. The research mainly focuses on the high price and large size of the wide-range and high-precision constant current sources currently on the market. The constant current sources consume a lot of power and most of them are not suitable for strong inductive loads and cannot meet the requirements of driving motor coils. Therefore, on the basis of the basic constant current source circuit, through continuous improvement and improvement, a program-controlled current source that pr...

AI Technical Summary

Problems solved by technology

In addition, most precision constant current sources on the market cannot perfectly adapt to inductive loads

Its accuracy class does not match its precision when carrying inductive loads

Strong inductive loads will cause system instability due to current hysteresis. The reason is that the voltage at the reverse input terminal of the operational amplifier also lags, which increases the high-frequency phase shift of the feedback loop and leads to self-excited oscillation. The existing technology such as the application number is The patent document of CN201810941862.2 discloses a bipolar high-precision constant current drive system and method suitable for inductive loads and provides a solution, but it is based on the combination of a precision error operational amplifier and a power operational amplifier. Feedback amplification, complex structure, excessive circuit power consumption and low power density in terms of high dynamic range technology

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