Direct conversion programmable power source controller: three-phase input with programmable single-phase output
AssigneeThe Boeing Company
InventorDouglas S. York
Life of this patent
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Abstract
The present invention is a direct conversion programmable power controller that receives polyphase input power that has an input power frequency a polarity. The controller includes a primary chopper for each phase of electrical power. Each primary chopper is electrically connected in wye connection to a transformer. A secondary chopper demodulates and rectifies each phase of power. Each secondary chopper has an input connected electrically to the secondary terminals of the transformer and has an output connected to a load in series connection.
Claims26
A direct conversion programmable power controller receiving polyphase input power at an input power frequency and having a polarity, the controller comprising:
- a primary chopper for each phase of electrical power, each primary chopper having an input, electrically connected in wye connection to each phase of power, having an output;
- a two-winding transformer for each phase of power, each transformer having primary and secondary terminals and connected electrically by its primary terminals to the output of the primary chopper;
- and
- a secondary chopper for demodulating and rectifying each phase of power, each secondary chopper having an input connected electrically to the secondary terminals of the transformer and having an output connected to a load in series connection.
A method for controlling three-phase electrical power, the power having a polarity and power frequency, the method comprising:
- generating a first electrical signal, having a first frequency greater than the power frequency of the three-phase electrical power;
- generating three second signals each of the second signals having a second frequency and being offset from the other second signals by phase-angles of 2π/3 radians;
- providing the three-phase electrical power from a wye connected power source, each phase of electrical power being offset from the other phases of electrical power by phase-angles of 2π/3 radians;
- phase-angle-modulating the first signal according to each second signal to produce a third signal at the first frequency to correspond with each phase of the three-phase power;
- reversing the polarity of each phase of electrical power at the first frequency according to the third signal that corresponds with the phase of electrical power;
- providing a two-winding transformer having primary and secondary terminals for each phase of electrical power;
- applying the phase of electrical power and the reversed phase of electrical power across each set of the primary terminals;
- chopping each phase of electrical power induced across each set of secondary terminals to pulse-width-modulate each phase of electrical power according to an instantaneous value of the second signal;
- rectifying each phase of electrical power to produce a generally biased votage;
- applying the rectified pulse-width-modulated electrical power from the secondary terminals to a series-connected load.
A direct conversion programmable power controller receiving polyphase input power at an input power frequency and having a polarity, the controller comprising:
- a primary chopper for each phase of electrical power, each primary chopper having an input, electrically connected in wye connection to each phase of power, having an output;
- a transformer for each phase of power, each transformer having primary and secondary terminals and connected electrically by its primary terminals to the output of the primary chopper;
- and
- a rectifying bridge for each phase of power, each secondary chopper having an input connected electrically to the secondary terminals of the transformer and having an output connected to a load in series connection.
Dependencies are inferred from the claim text.