| 摘要 |
<p>A power control circuit (50) for improved temperature control of thermoelectric devices to maintain the temperature of thermoelectric devices at a set point. The circuit includes an electrical power source (54); a rectifying device (BR1) to provide rectified alternating current from the electrical power source (54); a comparator device (90); circuitry (74, 76, 78) for providing a predetermined voltage to the inverting input (88) of the comparator device derived from the rectified alternating current (BR1); a sensor device (146) to monitor the temperature associated with the thermoelectric device; circuitry (92) for providing an adjustable DC voltage to the non-inverting input (96) of the comparator (90); a programmable control device (122) to receive an output from the sensor device (146) and provide an output to circuitry for providing an adjustable DC voltage; a switching device (80) connected between the thermoelectric device and the rectified alternating current (BR1); and control circuitry (100) which is coupled between the switching device and the output of the comparator device and is controlled by the output of the comparator device.</p> |
