Automatic temperature control ultralow temperature semiconductor refrigerator and automatic temperature control method thereof

Abstract

The invention discloses an automatic temperature control ultralow temperature semiconductor refrigerator and an automatic temperature control method thereof. The refrigerator comprises a temperature sensor, a preset temperature adjuster, a controller, a controllable switch stack, a direct current power supply, a semiconductor refrigeration stack, a radiator and a heat insulation casing, the semiconductor refrigeration stack is arranged on the radiator, the heat insulation casing is arranged above the radiator and covers the semiconductor refrigeration stack, the temperature sensor, the preset temperature adjuster and each controllable switch are respectively connected with the controller, and the direct current power supply is connected with semiconductor refrigeration pieces through the controllable switches to supply power for the semiconductor refrigeration pieces. The automatic temperature control method includes that based on differences of the preset temperature and the measured temperature, the accurate control of the operation time sequence and on-off state of a plurality of the refrigeration pieces can be achieved through the controllable switch stack, the accurate ultralow temperature refrigeration and the temperature control can be achieved, the operating process includes low speed starting, full load operating and constant temperature control, the control process utilizes a hierarchical control mode, the pulse duty ratio of the semiconductor refrigeration pieces are changed through the feedback mode and the optimal energy consumption correction is achieved.

Description

technical field [0001] The present invention relates to an ultra-low temperature semiconductor refrigeration controller with automatic temperature control and its automatic temperature control method. A low-temperature or ultra-low temperature refrigeration system composed of multiple semiconductor refrigeration chips. Background technique [0002] Low-temperature and ultra-low temperature refrigeration can be widely used in many scientific research and technical fields such as biopharmaceuticals, low-temperature electronics, semiconductor manufacturing, etc., especially occupy an important position in ultra-low temperature environmental experimental instruments and equipment, and often play an irreplaceable role. At present, commonly used refrigeration technologies include compressor refrigeration, semiconductor refrigeration technology, etc. Among them, semiconductor refrigeration technology has attracted widespread attention due to its advantages of no mechanical wear, lo...

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Problems solved by technology

[0003] Ultra-low temperature refrigeration is mainly obtained by means of compressor refrigeration or liquid nitrogen. To cool the temperature below -100°C, it is often necessary to use a two-stage cascaded vapor compression refrigeration system, but the structure of the system is complex and the cost is high; Although liquid nitrogen and other methods can obtain low temperature, this technology is inconvenient to operate and has certain risks. At the same time, this technology can only be adapted to short-term refrigeration needs. Long-term use requires a large amount of liquid nitrogen to maintain, and the cost of use is high.

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