Patent ID: 8418930
Filing Date: 2013-04-16
Classification: G05D

Abstract:
1. A temperature control circuit, comprising: a cooling unit comprising a first thermal diode, a first Zener diode, a first comparator, a cooling element, a first resistor, and a second resistor; and a heating unit comprising a second thermal diode, a second Zener diode, a second comparator, a heater, a third resistor, and a fourth resistor, wherein an anode of the first thermal diode is connected to a first power supply, and a cathode of the first thermal diode is grounded via the first resistor; an anode of the first Zener diode is grounded, and a cathode of the Zener diode is connected to the first power supply via the second resistor; an inverting terminal of the first comparator is connected to a node between the first thermal diode and the first resistor, and a non-inverting terminal of the first comparator is connected to a node between the first Zener diode and the second resistor; the cooling element comprises a first power input terminal connected to an output terminal of the first comparator, and a second power input terminal connected to a second power supply; an anode of the second thermal diode is connected to the first power supply via the third resistor, and a cathode of the second thermal diode is grounded; an anode of the second Zener diode is grounded, and a cathode of the second Zener diode is connected to the first power supply via the fourth resistor; an inverting terminal of the second comparator is connected to a node between the second thermal diode and the third resistor, and a non-inverting terminal of the second comparator is connected to a node between the second Zener diode and the fourth resistor; the heater comprising a first power input terminal connected to an output terminal of the second comparator, and a second power input terminal connected to the second power supply.