Constant-current source circuit

Abstract

The invention discloses a constant-current source circuit. The constant-current source circuit comprises a voltage reference generator and a constant-current source generator, wherein the voltage reference generator is used for generating the voltage reference of 6V ad outputs the voltage reference to the constant-current source generator; the constant-current source generator is used for generating a high-stability and high-accuracy constant-current source by use of the voltage reference. The constant-current source circuit is simple and free from temperature compensation, and has the characteristics of high power supply rejection ratio (up to 10<-8> to 10<-10>), high accuracy (+ / -1ppm), good temperature stability (not greater than + / -5ppm, high safety, adjustable load and the like.

Description

technical field [0001] The invention relates to a constant current source circuit, which belongs to the field of constant current source design. Background technique [0002] Constant current sources are widely used in various occasions such as laser pumping circuits, pyrotechnics detection, and I / F (current / frequency) frequency conversion. At present, the inertial measurement combination composed of high-precision laser gyroscope and quartz accelerometer has been widely used in launch vehicles and missiles, and the accuracy of constant current source directly determines the accuracy of laser gyroscope and quartz accelerometer (I / F conversion) The accuracy of the inertial measurement system fundamentally determines the accuracy of the inertial measurement combination, which directly affects the hit accuracy of launch vehicles and missile weapons. At the same time, the on-line monitoring of pyrotechnics used in a large number of launch vehicles and missiles requires a high-s...

AI Technical Summary

Problems solved by technology

Although this structure effectively reduces the impact on the constant current source, part of the current still flows into the operational amplifier through the base of the transistor Q2, which further affects the accuracy of the constant current source, especially the magnification of the transistor due to temperature changes. , the effect of this current will increase dramatically

3. The constant current source is difficult to meet the test requirements of low-voltage pyrotechnics

Since the pyrotechnics test has strict requirements on the size of the constant current source, the constant current source is required to have extremely high safety, that is, it is required to ensure that the output current does not exceed the limit test current of the pyrotechnics at least in the event of a second-degree fault. , obviously the above constant current source circuit is difficult to meet the requirements

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