Variable frequency, variable voltage power supply

Details Variable frequency, variable voltage power supply Variable frequency, variable voltage power supply

1976-11-22

1977-09-13

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318227, 363124, 363132, 363138, H02M 700

Patent

active

040485544

ABSTRACT:
A static polyphase inverter for supplying variable frequency, variable magnitude voltage to a load such as a polyphase motor has a transistor chopper between a unidirectional power source and an inverter bridge having n phase legs each of which includes a load current carrying controlled rectifier in series with the emitter-collector path of a transistor switch and the junction therebetween connected a phase winding of the motor; time ratio controlling means including a constant frequency oscillator for modulating the chopper at the constant oscillator frequency and for regulating the width of pulses conducted by the chopper as a function of the magnitude of an analog command signal; means for selectively controlling the switching frequency of the load current carrying controlled rectifiers as a function of the magnitude of the analog command signal to establish the inverter fundamental output frequency; means for intermittently applying a bias source in opposite polarity to the anode-cathode path of the controlled rectifiers when the transistor chopper is off to commutate them when they are not carrying load current; and means for synchronizing the switching of the chopper to the modulation frequency so the chopper is reset at the beginning of each half cycle of modulation frequency.

REFERENCES:
patent: 3403318 (1968-09-01), Krauthamer et al.
patent: 3611108 (1971-10-01), Susumu et al.
patent: 3848176 (1974-11-01), Etter
patent: 3855520 (1974-12-01), Stich
patent: 4019116 (1977-04-01), Klautschek

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