Large-target-surface detector semiconductor vacuum deep refrigeration full-bridge control circuit

Abstract

The invention relates to a large-target-surface detector semiconductor vacuum deep refrigeration full-bridge control circuit, and belongs to the technical field of semiconductor temperature control circuits. The large-target-surface detector semiconductor vacuum deep refrigeration full-bridge control circuit comprises a microprocessor, a bridge drive circuit, an H bridge circuit, an LCR filter circuit, a bridge arm current detection circuit, a bridge arm voltage detection circuit, a cold end temperature sensor, a cold end temperature detection circuit, a hot end temperature sensor, a hot end temperature detection circuit, a fan and a fan drive speed regulation circuit. Wherein the bridge arm current detection circuit comprises a precise current detection resistor and a current detection amplifier; the microprocessor is provided with an ADC interface, an SPI interface and an external communication interface, and reading of external signals, adjustment of the air speed of the fan and communication with an upper computer are achieved. According to the invention, large refrigeration power and large temperature difference control of the large-target-surface detector can be realized, the refrigeration efficiency is high, and the lowest refrigeration temperature can reach -50 DEG 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 x 61.44mm, and its peak power consumption can reach 5W, which poses a challenge to the cooling of the detector. 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- / pi...

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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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