Electric heating – Metal heating – Of cylinders
Patent
1984-11-16
1986-10-14
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1049R, 363 97, 363 80, 323246, 361 83, H05B 606
Patent
active
046174427
ABSTRACT:
An induction heating apparatus includes an inverter (5) which is driven by a DC power supply (3), and the inverter (5) includes a heating coil (9) and a switching transistor (11) which is connected thereto in series. The switching transistor (11) is turned on or off by a control circuit (35) to control a current flowing through the heating coil (9). The control circuit (35) takes a collector voltage of this switching transistor (11) from the point where the heating coil (9) and the switching transistor (11) are connected in series through a terminal (39). An integrated voltage of this collector voltage is generated in the control circuit (35), and the collector voltage is compared with the integrated voltage. When the former becomes lower than the latter, after a certain delay time, a switching signal is outputted from the control circuit (35), and the switching transistor (11) is turned on. Such a delay time is preferably varied in response to the magnitude of the collector voltage.
REFERENCES:
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4179727 (1979-12-01), Muto et al.
patent: 4277667 (1981-07-01), Kiuchi
patent: 4351020 (1982-09-01), Letl et al.
patent: 4390769 (1983-06-01), Steigerwald
patent: 4461990 (1984-07-01), Bloomer
Leung Philip H.
Sanyo Electric Co,. Ltd.
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