Radiation-resistant 100-V high-precision current detection circuit

A current detection circuit and current detection technology, applied in the direction of measuring current/voltage, components of electrical measuring instruments, measuring electricity, etc., can solve the problems of high cost and detection accuracy that cannot meet the requirements of satellites

Active Publication Date: 2017-02-15
XIAN MICROELECTRONICS TECH INST
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Problems solved by technology

At present, there is no anti-radiation 100V current monitor in China, and similar foreign current monitors have no anti-irradiati

Method used

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  • Radiation-resistant 100-V high-precision current detection circuit
  • Radiation-resistant 100-V high-precision current detection circuit
  • Radiation-resistant 100-V high-precision current detection circuit

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0030] Anti-radiation 100V high-precision current detection circuit of the present invention, such as figure 1 shown.

[0031] RS is a precision sampling resistor of mΩ level. DZ1~DZ4 use 2CW78 with a voltage stabilization value of 15V~16V. The LZF648 circuit is an anti-irradiation current detection chip U1. It is an amplifier with current detection function. Its detection voltage range: 3.5mV~100mV; input offset voltage: ≤3mV; gain: 100; gain error: ≤±2.5%; single power supply range is +12V~+18V, input common mode voltage range is 25V~80V. In order to meet the high-voltage sampling of 100V, the ground of the chip is designed to be floating to ensure that its common-mode voltage is within the safe voltage range. INA117 is a high common-mode voltage differential amplifier of TI Company, its ...

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Abstract

The invention relates to a radiation-resistant 100-V high-precision current detection circuit comprising a precision resistor RS, a current detection chip U1 and a voltage differential amplifier U2. One end of the precision resistor RS is connected with a bus voltage and the other end is connected with a load. A power terminal of the current detection chip U1 is connected with a floating voltage Va and a floating voltage Vb, wherein the a floating voltage Va is higher than the floating voltage Vb. An input terminal of the current detection chip U1 is connected with the two ends of the precision resistor RS; a positive-phase input terminal of the voltage differential amplifier U2 is connected with an output terminal of the current detection chip U1, a negative-phase input terminal is connected with the floating voltage Vb, and an output terminal of the voltage differential amplifier U2 serves as an output terminal of the circuit to output a detection signal. On the basis of the floating design, a radiation-resistant current monitoring device and a high-common-mode differential amplifier are arranged in cascade connection; the precision resistor RS is arranged to carry out precise sampling on the voltage; targeted processing is carried out from the input terminal, the power supply terminal, and the processing terminal; and thus high-precision current detection is realized based on mutual cooperation.

Description

technical field [0001] The invention relates to a semiconductor hybrid integrated circuit, in particular to an anti-radiation 100V high-precision current detection circuit. Background technique [0002] In the existing technology, the temperature controller of the power distribution interface unit of my country's new generation communication satellite platform needs to have 8-way 100V, 500W heater power distribution, 24-way 100V, 200W heater power distribution capabilities, and 32-way heater power distribution circuits need to have On-rail autonomous management functions such as current detection and fault isolation protection. At present, there is no anti-radiation 100V current monitor in China, and the similar foreign current monitors have no anti-irradiation characteristics. At the same time, the cost is high, and the detection accuracy cannot meet the requirements of satellite use. Contents of the invention [0003] Aiming at the problems existing in the prior art, the...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R1/36G01R1/30G01R1/28G01R15/04
CPCG01R1/28G01R1/30G01R1/36G01R15/04G01R19/00
Inventor 刘建红
Owner XIAN MICROELECTRONICS TECH INST
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