Temperature-rated variable speed control circuit of an...

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator

Reexamination Certificate

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Details

C388S821000, C388S934000, C318S461000, C318S471000, C318S432000

Reexamination Certificate

active

07027721

ABSTRACT:
An electric fan temperature-rated variable speed control circuit, includes a D.C. current source and fan activation IC. There are, between the current source positive and negative poles serially connected transistor, regulation tube, with the regulation tube negative pole linked to the current source negative pole, and its positive pole, incorporated to form the primary current. Between triode base and collector lies a serially connected resistor. The triode collector is linked to the current source positive pole, and between its base and collector lies a serially connected rectifying resistor, which bypasses through the base to connect with the fan activation IC for sending out fan rotation speed control signals with which to form a circuit that adopts a straightforward, easy-to-implement method that offers low-cost and dependable temperature-control characteristics.

REFERENCES:
patent: 4656553 (1987-04-01), Brown
patent: 4856078 (1989-08-01), Konopka
patent: 6023402 (2000-02-01), Kaminski
patent: 6396231 (2002-05-01), Horng et al.
patent: 6396238 (2002-05-01), Miyahara

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