Electric heating – Heating devices – Tool or instrument
Patent
1973-11-23
1976-03-09
Bartis, A.
Electric heating
Heating devices
Tool or instrument
219236, 219499, 219501, 219505, 228 51, H05B 102, B23K 304
Patent
active
039433269
ABSTRACT:
In an electrical soldering iron having a soldering tip which is heatable to a predetermined operating temperature by means of an electrical heater element and in which electrical heating and control circuits are provided to supply electric current to the heater element in response to predetermined changes in temperature of the soldering tip an electrically conducting sensing element is operatively connected with the soldering tip having a resistance which varies directly with changes in its temperature. The heating circuit has a controlled rectifier as a switch and the control circuit is adapted to regulate said controlled rectifier to open and close the heating circuit in response to a predetermined change in the resistance of the sensing element. The control circuit includes a bridge circuit in which a bias compensating diode is connected to compensate for bias of the controlled rectifier. A second diode connected in the control circuit cooperates with the bias compensating diode so as to provide for anticipation of the switch-off temperature of the SCR to thereby minimize variation in the actual soldering tip temperature for any given temperature setting.
REFERENCES:
patent: 3149224 (1964-09-01), Horme et al.
patent: 3393856 (1968-07-01), Fortune
patent: 3456095 (1969-07-01), Fox
patent: 3551639 (1970-12-01), Gotley
patent: 3560710 (1971-02-01), Fuellemann
patent: 3564205 (1971-02-01), Tyler
patent: 3646577 (1972-02-01), Ernst
patent: 3716692 (1973-02-01), Schick et al.
Bartis A.
Royel International Pty. Ltd.
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