Induction heating driver circuit

Details Induction heating driver circuit Induction heating driver circuit

1988-03-31

1990-03-13

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 363 49, 323901, H05B 606

Patent

active

049084895

ABSTRACT:
The present invention is an improved induction heating apparatus and more particularly a improved oscillation control circuit. The induction heating apparatus includes at least one induction coil, with a parallel capacitance forming an LC oscillation circuit. A set of at least one semiconductor switching devices enables a power source to be coupled to the LC oscillation circuit. This power source is preferably a half wave rectified AC voltage. A control circuit periodically switches ON the semiconductor switching devices to couple the half wave rectified AC voltage to the LC oscillation circuit thereby stimulating electrical oscillations. The control circuit includes an initialization circuit for inhibiting the first coupling of the half wave rectified AC voltage to the LC oscillation circuit while the half wave rectified AC voltage is greater than a predetermined amount. In the preferred embodiment this is achieved by delaying this initial energization until a leading edge of a pulse of the half wave rectified AC voltage. This serves to protect the semiconductor switching devices from possible initial overcurrent conditions.

REFERENCES:
patent: Re30623 (1981-05-01), Schultz et al.
patent: 2625242 (1965-01-01), Reed
patent: 3079913 (1965-03-01), Nelson
patent: 3294946 (1966-12-01), Baermann
patent: 3608627 (1971-09-01), Shevlin
patent: 3745290 (1973-07-01), Harnden, Jr.
patent: 3777094 (1973-12-01), Peters, Jr.
patent: 3781503 (1973-12-01), Harnden, Jr.
patent: 3786222 (1974-01-01), Harnden, Jr.
patent: 3790735 (1974-02-01), Peters, Jr.
patent: 3843857 (1974-10-01), Cunningham
patent: 3887253 (1975-06-01), Bridges et al.
patent: 3908749 (1975-09-01), Williams
patent: 3944100 (1975-12-01), Mack et al.
patent: 4005745 (1975-02-01), Colato et al.
patent: 4016390 (1977-04-01), Amagami
patent: 4020310 (1977-04-01), Souder et al.
patent: 4087142 (1978-06-01), Aumack
patent: 4103736 (1978-08-01), Colato et al.
patent: 4110587 (1978-08-01), Souder, Jr.
patent: 4180125 (1979-12-01), Schultz et al.
patent: 4194109 (1980-03-01), Springer
patent: 4254824 (1981-03-01), Springer
patent: 4285391 (1981-08-01), Bourner
patent: 4438311 (1984-03-01), Tazima et al.
patent: 4560851 (1985-12-01), Tsukamoto et al.
patent: 4564733 (1986-01-01), Karklys
patent: 4625271 (1986-11-01), Chetty et al.
patent: 4638418 (1987-01-01), Alexander
patent: 4698743 (1987-10-01), Onodera et al.

Affiliated with

Also associated with

Rating

Induction heating driver circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Induction heating driver circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Induction heating driver circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-52102