Electric heating – Metal heating – Of cylinders
Patent
1977-09-21
1978-09-12
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1077, H05B 504
Patent
active
041140109
ABSTRACT:
An auxiliary electrical test circuit is provided which is adapted to assist in matching the resonant frequency of an induction heating load with the rated frequency range of a solid state high frequency power source coupled to the load circuit. The load circuit includes an inductor, power factor correction capacitors, and a given workpiece to be inductively heated. The test circuit includes an audio frequency oscillator of low output power having an output frequency which may be adjusted in a range extending below and above the rated frequency range of the solid state power source. The oscillator output is coupled to the load circuit independent of the solid state power source, and the output frequency of the oscillator is adjusted to coincide with the resonant frequency of the load circuit, which coincidence is determined by observing the peak voltage obtained during adjustment of the oscillator output frequency. The oscillator frequency is then compared to the rated frequency range for the solid state power supply. If the resonant frequency of the load circuit is outside the rated frequency range for the solid state power supply, power factor correction capacitors are added or subtracted until the load circuit frequency is determined to be within the rated frequency range of the power supply.
REFERENCES:
patent: 2470443 (1949-05-01), Mittelmann
patent: 2498760 (1950-02-01), Kreithen
patent: 2858406 (1958-10-01), Boyd et al.
patent: 3419792 (1968-12-01), Kasper et al.
patent: 3475674 (1969-10-01), Porterfield et al.
Park-Ohio Industries, Inc.
Reynolds Bruce A.
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