Circuits primarily intended for use in desoldering tools

Electric heating – Heating devices – With current connection and/or disconnection means

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Details

323 22SC, 219501, 219486, 219492, H03R 1700, H01B 102

Patent

active

042152682

ABSTRACT:
Two different types of circuits, the first a coil operation circuit and the second an operating circuit can be effectively used together in connection with an assembly such as a desoldering tool having a remotely located, associated structure for use in regulating when a vacuum is available at the tool in response to manipulation of the tool. The operating circuit employed utilizes a current control circuit capable of being actuated through the use of a switch on the tool to pass a full or a half wave AC current and a load such as a heating element located on the tool. The operating circuit also includes a detection circuit for determining whether a full or half wave current is being utilized to supply power to the load which is positioned within the associated structure. The coil operation circuit is located within this associated structure and includes a bidirectional solid state switch is series with a coil, another solid state switch in parallel with the coil, and the first noted switch. The two switches are connected through the use of a network containing a diode and a capacitor so as to control the operation of a first switch. A coupling circuit connects the detection circuit and the second switch for operating the second switch in accordance with whether a full or half wave current is being utilized to power the load.

REFERENCES:
patent: 3247358 (1966-04-01), Schmidt
patent: 3314574 (1967-04-01), Longval et al.
patent: 3456095 (1969-07-01), Fox
patent: 3551639 (1970-12-01), Gotley
patent: 3649849 (1972-03-01), McGuirk, Jr.
patent: 3708696 (1973-01-01), Lorenz
patent: 3716692 (1973-02-01), Schick et al.
patent: 3862468 (1975-01-01), Fortune
patent: 3883716 (1975-05-01), Fortune
patent: 4031458 (1977-06-01), Ichikawa
"SCR Specifications", by Weller Company, p. 1, (no date).

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