Circuit for generating a sinusoidal synchronization voltage for

Details Circuit for generating a sinusoidal synchronization voltage for Circuit for generating a sinusoidal synchronization voltage for

1982-04-05

1984-08-07

Shoop, William M.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

307252N, 318345G, G05F 500

Patent

active

044646208

ABSTRACT:
A synchronization voltage is formed as the product of the output voltage of a phase-locked loop and the mean value of the magnitude of the network voltage. The synchronization voltage is compared with the network voltage. A first control signal is formed when both voltages are the same. A reversing switch, in a first switching state, conducts the network voltage and, in a second switching state, conducts the synchronization voltage to a reference frequency-input of the phase-locked loop. A second control signal is formed when the phase-locked loop locks or latches with the thereto inputted reference frequency. The reversing switch is controlled by both control signals such that upon absence of the first control signal and the simultaneous presence of the second control signal there is attained the second switching state and otherwise the first switching state. The circuit can be beneficially used in a current regulation circuit of a drive for a powerful electric motor, with a power supply network operating at up to 400 Hz with a weak generator.

REFERENCES:
patent: 3942041 (1976-03-01), Morriss
patent: 3958172 (1976-05-01), Beck
patent: 4028609 (1977-06-01), Detering
patent: 4042873 (1977-08-01), Cox
patent: 4117392 (1978-09-01), Kintigh et al.
patent: 4346339 (1982-08-01), Lewandowski
patent: 4394723 (1983-07-01), Hoffman

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