Constant Temperature Source Chip (IC)

Constant Temperature Source Chip (IC) (Patented Product)

   The Constant Temperature Source Chip (IC) is composed of the chip, a heat-transfer conducting plate, three leads, and an outer package. The chip is connected to the three leads and mounted on the heat-transfer conducting plate; the outer package ties the chip and the conducting plate together. Of the three leads connected to the chip, two output terminals connect to the power supply, and the other output terminal connects to an external temperature-preset resistor whose other end also connects to the power supply. This external temperature-preset resistor is a variable resistor. Inside the chip are a temperature-deviation measuring bridge circuit, an operational amplifier, a voltage-regulating circuit, and a heating-regulation circuit. The temperature-deviation measuring bridge connects to the operational amplifier, the operational amplifier connects to the heating-regulation circuit, and the voltage-regulating circuit connects to both the measuring bridge and the heating-regulation circuit.

   In use, the device is mounted on a reference device or sensitive element that requires a constant temperature, or placed together with it in an isothermal body. By adjusting the external temperature-preset resistor 4, any constant temperature value in the range of about 45°C to 125°C can be obtained. When supplemented by means such as a semiconductor cooler, the lower constant temperature can reach below 0°C.

   Because the chip's temperature measurement, deviation amplification, heating, and feedback are all integrated within the same chip, it responds thermally very quickly, and errors caused by the temperature coefficients of the internal components are not significant.