Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1990-09-26
1992-06-02
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
372 34, 323271, H01H 3710, H01S 304
Patent
active
051189640
ABSTRACT:
A thermo-electric laser temperature control apparatus is driven by a switching mode control circuit. Driving current polarity determines if the thermo-electric apparatus is operating in a heat absorbent or heat generating mode. A sequencing control circuit is used in association with the control circuit to define operative ranges of the thermo-electric temperature control apparatus consistent with maintaining proper temperature for a linear operative range for the laser. Feedback circuitry permits precision control of the converter output to limit the operative temperature range of the laser to a small precisely defined temperature window.
REFERENCES:
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patent: 4571728 (1986-02-01), Yoshikawa
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patent: 4792957 (1988-12-01), Kollanyi
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patent: 4812733 (1989-03-01), Tobey
patent: 4884279 (1989-11-01), Odagiri
patent: 5019769 (1991-05-01), Levinson
AT&T Bell Laboratories
Fleming Fritz
Pellinen A. D.
Steinmetz A. G.
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