A High Stability Constant Current Source Generating Circuit and Temperature Measuring Circuit

Abstract

The invention discloses a high stability constant current source generating circuit and a temperature measuring circuit, wherein the high stability constant current source generating circuit comprises an error superposition part, a feedback control part, a constant current output part and an error generation part, the error superposition part, The feedback control part and the constant current output part are connected in turn, the input end of the error generation part is connected with the constant current output part, the output end of the error generation part is connected with the input end of the error superposition part, the high stability constant current source generating circuit of the present invention , has the beneficial effect of high stability, and the circuit structure is simple.

Description

technical field [0001] The invention relates to the technical field of high-precision temperature measurement, in particular to a high-stability constant current source generation circuit and a temperature measurement circuit. Background technique [0002] In the current spacecraft temperature measurement system, platinum resistors are widely used due to their advantages of wide temperature measurement range, good linearity, high stability, and simple structure. The higher the stability of the source, the higher the stability of the entire temperature measurement system. [0003] At present, dual op-amp constant current sources are usually used as the excitation source for platinum resistors. This constant current source is only used in occasions with low precision, such as occasions with measurement accuracy > 0.1°C. With the development of satellite payload technology, especially High-precision load instruments have higher and higher requirements for temperature measur...

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Problems solved by technology

[0003] At present, dual op-amp constant current sources are usually used as the excitation source for platinum resistors. This constant current source is only used in occasions with low precision, such as occasions with measurement accuracy > 0.1°C. With the development of satellite payload technology, especially High-precision load instruments have higher and higher requirements for temperature measurement accuracy, and the existing dual op-amp constant current sources can no longer meet the requirements

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