Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1997-11-07
2000-02-22
Gaffin, Jeffrey
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361189, 361171, H01H 4736
Patent
active
060287608
ABSTRACT:
A pulse generator is provided for energizing a coil with period bipolar current pulses for the purposes of airborne prospecting. The pulses have a generally square waveform, and the pulse generator includes a resonant DC to AC converter circuit including a DC input and an output coupled to the coil. A control circuit is provided for controlling the switching of the converter, and a resonant capacitor is connected in parallel across the DC input. A decoupling diode is provide for decoupling the resonant capacitor from the DC input when the voltage across the resonant capacitor exceeds that of the DC input. The converter includes first and second resonant charging sub-circuits, first and second resonant discharging sub-circuits, first and second freewheeling sub-circuits and first and second exponential charging sub-circuits. The control circuit is arranged to control the amplitude and frequency content of the square waveform by switching the convertor circuit to operate between the above sub-circuit types in at least one controlled switching cycle during unipolar current pulse intervals. The circuit further includes a clamping circuit arranged to supply a substantially constant DC voltage to the coil which is higher than that of the DC input.
REFERENCES:
patent: 4410926 (1983-10-01), Hafner et al.
"Invertor Suitable for Operation Over a Range of Frequency", E.E. Ward, Ph.D., Proceedings The Institution of Electrical Engineers, vol. 111, No. 8, Aug. 1964, pp. 1423-1434.
"Zero-Voltage-Switching PWM Inverter for High-Frequency DC-AC Power Conversion", Jin He, Ned Mohan and Bill Wold, IEEE Transactions on Industry Applications, vol. 29, No. 5, Sep./Oct. 1993, pp. 959-968.
"A Modified C-Dump Converter for Variable Reluctance Machines", A. Hava, V. Blasko and T. A. Lipo, IEEE (0-7803-0453-5/91), May, 1991, pp. 886-891.
Anglo American Corporation of South Africa Limited
Gaffin Jeffrey
Huynh Kim
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