Refrigeration – Using electrical or magnetic effect – Thermoelectric; e.g. – peltier effect
Reexamination Certificate
2007-12-12
2011-11-08
Jones, Melvin (Department: 3744)
Refrigeration
Using electrical or magnetic effect
Thermoelectric; e.g., peltier effect
C062S003200
Reexamination Certificate
active
08051665
ABSTRACT:
A temperature control system is provided for efficiently controlling the temperature of an optical transmitter such as a laser diode. The temperature control system of the present invention reduces power consumption and achieves a higher efficiency by employing a voltage controller and a high-efficiency DC-DC step-down converter between the TEC controller, which drives the thermoelectric cooler, and the microcontroller, which governs the optical transmitter operation. The voltage controller converts an analog voltage command signal into a current-based command signal, which is then sent to the DC-DC step-down converter. The DC-DC converter produces a stepped-down voltage which it supplies to the TEC controller. The TEC controller receives the stepped-down voltage input from the DC-DC converter and outputs a corresponding current signal to the thermoelectric cooler. Because the current signal output by the TEC controller is proportional to the voltage signal it receives from the DC-DC converter, the current signal is reduced in magnitude. Upon receiving the current drive pulses, the thermoelectric cooler operates to stabilize the temperature of the laser diode.
REFERENCES:
patent: 5689957 (1997-11-01), DeVilbiss et al.
patent: 5885378 (1999-03-01), Komada et al.
patent: 6205790 (2001-03-01), Denkin et al.
patent: 7782002 (2010-08-01), Cook, II
Lipkin Ziv
Zhang Jingcheng
Finisar Corporation
Jones Melvin
Maschoff Gilmore & Israelsen
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