The temperature control objects have various shapes, and the TEC cannot be made too large under the influence of thermal stress, so in many cases, multiple TECs must be used. Determine the TEC temperature control drive scheme In order to realize the characteristics of thermal cycling process control, it is necessary to design a TEC drive controller.ġ. Therefore, using TEC for heating and cooling, the control current is better than the voltage because of the need to adjust the size and direction of the current, it is called bipolar current control.

The heat absorption is affected by the temperature difference and the magnitude of the current at the same time and in order to obtain different temperature differences and heat absorption at the same voltage, the current changes greatly. The TEC heat-absorbing surface or the radiating surface is determined by the direction of the TEC current (TEC can be regarded as a non-linear resistance load, the direction of the current changes with the direction of the voltage). Since almost all TEC electric power is converted into heat energy QF=UI, only when the heat exchange amount QJ of the TEC heat-absorbing surface is greater than the calorific value QF/2 (assuming that the heat generated by the electric power is equally distributed on both sides), and when the heat-emitting surface effectively dissipates heat, Only the TEC heat-absorbing surface can be cooled (the heat-absorbing surface heat absorption QIN=QJ-QF/2, the heat-radiating surface heat dissipation QOUT=QJ+QF/2). TEC relies on heat exchange to absorb heat from one side and release heat from the other side to achieve heating and cooling. In the development process of a certain type of instrument, the metal block needs to be quickly heated, cooled and kept at a constant temperature, and the thermal cycle process control is performed.

Widely used in aerospace, military, optoelectronics, electromechanical, medical, automotive, communications and other fields. Semiconductor thermoelectric cooler (Thermo-E1ectric Cooler, TEC for short) has the characteristics of small size, no noise, no pollution, etc.

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