Generator with dual cycloconverter for 120/240 VAC operation

Details Generator with dual cycloconverter for 120/240 VAC operation Generator with dual cycloconverter for 120/240 VAC operation

2007-01-30

2007-01-30

Ponomarenko, Nicholas (Department: 2834)

Electricity: single generator systems

Combined control of generating means and load circuit

Including load circuit-making and breaking

C320S123000

Reexamination Certificate

active

11483697

ABSTRACT:
A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first cycloconverter and the second three phase AC voltage is coupled to a second cycloconverter. Live outputs of each cycloconverter are coupled to each other through a switch, such as a relay, and netural outputs of each cycloconverter are coupled to ground. A controller controls the cycloconverters to provide the modes of operation. In the 120 VAC mode, the switch across the live outputs of the first and second cycloconverters is closed, shorting the live outputs of the first and second cycloconverters together so that the live outputs are in parallel and the controller operates the first and second cycloconverters so their output voltages are in phase with each other. When in the 240/120 VAC mode, the switch across the live outputs of the first and second cycloconverters is open so that the live outputs are in series and the controller operates the first and second cycloconverters so that their output voltages are 180 degrees out of phase. The permanent magnet generator has rotor position sensors that are used by a DC motor drive to drive the generator as a brushless DC motor to start the engine of the generator system and also to develop cosine wave information for use in controlling the cycloconverters.

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