A semiconductor vacuum deep cooling full-bridge control circuit for a large target surface detector

Abstract

The invention relates to a semiconductor vacuum deep cooling full-bridge control circuit for a large target surface detector, belonging to the technical field of semiconductor temperature control circuits, including a microprocessor, a bridge drive circuit, an H-bridge circuit, an LCR filter circuit, a bridge arm current detection circuit, Bridge arm voltage detection circuit, cold junction temperature sensor, cold junction temperature detection circuit, hot junction temperature sensor, hot junction temperature detection circuit, fan and fan drive speed regulation circuit, wherein the bridge arm current detection circuit includes precision current detection resistor and current detection The amplifier; the microprocessor is provided with an ADC interface, an SPI interface and an external communication interface to realize the reading of external signals, the adjustment of the wind speed of the fan and the communication with the upper computer. The invention can realize large cooling power and large temperature difference control of a large target surface detector, high cooling efficiency, and the lowest cooling temperature can reach -50°C.

Description

technical field [0001] The invention relates to the technical field of semiconductor temperature control circuits, in particular to a semiconductor vacuum deep cooling full-bridge control circuit for a large target surface detector. Background technique [0002] With the maturity of semiconductor technology and the continuous development of astronomical observation applications, the size of the detector is getting larger and larger, from the initial imaging area of ​​a few millimeters to the current imaging area of ​​tens of millimeters. The array, scientific grade, back-illuminated CMOS image sensor has reached 6K×6K resolution, the highest frame rate can reach 26fps, the photosensitive area can reach 61.44mm x61.44mm, and its peak power consumption can reach 5W. new challenges. The dark current index of the detector is mainly affected by the temperature. When the room temperature is 25°C, the dark current is 20e- / pixel / sec. When the deep cooling technology is used to cont...

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Problems solved by technology

[0005] The invention patent with the publication number CN111370498A solves the problem that the existing vacuum system is bulky, complex in structure, cumbersome in operation, unsuitable for use in mobile devices, and due to the use of vacuum pumps and valve pipelines to ensure the vacuum degree of the cavity, there is interference with the vacuum degree of the cavity, etc. Problem, provide a detector small permanent high vacuum cavity and its preparation method

[0006] However, the existing linear drive TEC circuit has low power and low efficiency, and the existing switch mode drive TEC circuit with internal integrated MOS tube has low power, poor versatility, and low temperature control accuracy. As a result, the current semiconductor temperature control circuit cannot meet the requirements. Large target surface detectors require large cooling power, large temperature difference, and high-efficiency cooling

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