A constant temperature metal bath

Abstract

The invention provides a constant temperature metal bathing device which comprises a DC 12V power supply adapter, a main circuit, a semiconductor refrigeration sheet, a control circuit, a temperature sensor, a heat radiating sheet, a fan and a heat guiding platform. The semiconductor refrigeration sheet, through the main circuit and the power supply adapter, forms a loop circuit with the current power supply; and the two surfaces are closely attached with the heat guiding platform and the heat radiating sheet respectively through heat conduction silicone grease. The power switch tube inside the main circuit is connected with the control circuit through conductive wires. The temperature sensor is closely attached to the lower surface of the heat guiding platform through the heat conduction silicone grease and is connected with the control circuit through the conductive wires. The fan is powered at a volt of DV 12V and faces right the wind channel of the heat radiating fin to provide cooling air. According to the invention, a cascade connection type main circuit topology is chosen featuring Buck circuit and full bridge inverter. Through the adjustment of the Buck, the outputted pulse width is changed so as to realize the precise adjustment of the outputted power. Through the full bridge inverter, the direction change is realized of the current; the cooling and heating of the semiconductor is controlled so as to realize the precise control over the entire working process.

Description

technical field [0001] The invention provides a constant temperature metal bath device with uniform temperature and precise temperature control, which belongs to the field of analytical instruments. Background technique [0002] Petroleum, biology, and chemical industries need to meet certain temperature conditions when analyzing and testing related samples. Therefore, it is necessary to perform heating, cooling, and heat preservation through a constant temperature control system to keep the samples in a constant temperature environment. As a temperature-controlled instrument for the preservation and reaction of biochemical reagents, the constant temperature metal bath is widely used in the preservation of various biochemical samples, the preservation and reaction of various enzymes, the polymerase chain reaction, the pre-denaturation of electrophoresis, and the coagulation of serum And accounting and protein denaturation treatment. [0003] The current constant temperature...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a constant temperature metal bath with a Buck circuit and a full-bridge inverter circuit connected in series as the main circuit mode. Problems such as large temperature overshoot, low temperature stability, and low temperature control accuracy caused by large voltage ripple

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