IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0452671
(2003-05-30)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
11 |
초록
▼
A direct conversion programmable power controller receiving polyphase input power at an input power frequency and with a polarity is provided. The controller includes a primary chopper for reversing each phase of electrical power according to a reference frequency that is substantially higher than f
A direct conversion programmable power controller receiving polyphase input power at an input power frequency and with a polarity is provided. The controller includes a primary chopper for reversing each phase of electrical power according to a reference frequency that is substantially higher than frequency of the electrical power. Each primary chopper has a power input, a signal input, and an output. The power input is electrically connected in wye-connection to each phase of power. A transformer for each phase of power has primary and secondary terminals and is electrically connected by its primary terminals to the output of the primary chopper. A secondary chopper for each phase of power has an input connected electrically to the secondary terminals of the transformer. The secondary chopper is configured to reverse each phase of electrical power according to the reference frequency and to shift phases of electrical power according to a reference signal.
대표청구항
▼
1. A direct conversion programmable power controller receiving polyphase input power at an input power frequency and having a polarity, the controller, for each phase of power, comprising:a primary chopper for reversing each phase of electrical power according to a first reference signal having a re
1. A direct conversion programmable power controller receiving polyphase input power at an input power frequency and having a polarity, the controller, for each phase of power, comprising:a primary chopper for reversing each phase of electrical power according to a first reference signal having a reference frequency that is substantially higher than frequency of the electrical power, each primary chopper having a power input, a signal input, and an output, the power input being electrically connected in wye-connection to each phase of power;a transformer for each phase of power, each transformer having primary and secondary terminals and being electrically connected by its primary terminals to the output of the primary chopper; anda secondary chopper for each phase of power, the secondary chopper having an input electrically connected to the secondary terminals of the transformer and an output electrically connected to a load, the secondary chopper being configured to phase-shift the first reference signal according to a second reference signal and to reverse each phase of electrical power according to the phase-shifted reference signal. 2. The controller of claim 1, further comprising:a processor; anda first sensor for sensing at least one phase of power, the first sensor being configured to measure the input power frequency. 3. The controller of claim 2, wherein the processor generates the second reference signal according to the measured input power frequency and a desired output frequency. 4. The controller of claim 3, wherein the second reference signal has a frequency equal to a sum of the frequency of the power input frequency and the desired output frequency. 5. The controller of claim 4, wherein a feedback system generates the second reference signal according to the power input frequency and a reference sinusoid. 6. The controller of claim 1, wherein the desired output frequency is substantially zero, such that direct current is provided to the load. 7. The controller of claim 1, wherein the load is electrically connected to the output in three-phase power in a delta connection. 8. The controller of claim 1, wherein the output of each phase is electrically connected to the remaining phases in series such that single-phase power is presented to the load. 9. The controller of claim 1, wherein the output of the primary chopper is electrically connected to the input terminals of the transformer by a power bus. 10. The controller of claim 9, wherein a plurality of transformers are electrically connected to the output terminals of the primary chopper, each of the plurality of transformers being electrically connected at its output terminals to one of a plurality of secondary choppers, the secondary choppers phase-shifting the first reference signal according to one of a plurality of second reference signals and being electrically connected to one of a plurality of loads. 11. The controller of claim 1, wherein the output of the transformer is connected to the input terminals of the secondary chopper by a power bus. 12. The controller of claim 11, wherein a plurality of secondary choppers are electrically connected to the output terminals of the transformer, the secondary choppers phase-shift the first reference signal according to one of a plurality of second reference signals and being electrically connected to one of a plurality of loads. 13. The controller of claim 11, wherein the transformer has a plurality of secondary windings, the output terminals of each secondary winding being electrically connected to one of a plurality of secondary choppers, the secondary choppers phase-shift the first reference signal according to one of a plurality of second reference signals, and being electrically connected to one of a plurality of loads. 14. The controller of claim 1, further comprising an input low-pass, power conditioning filter including:an inductive element electrically connected in series between a source of the polyph ase input power and the input of the primary chopper; anda capacitive element electrically connected to the input of the primary chopper in parallel with the source of polyphase input power. 15. The controller of claim 1, further comprising an output low-pass, power conditioning filter including:an inductive element electrically connected in series between the load and the output of the secondary chopper; anda capacitive element electrically connected to the output of the secondary chopper in parallel with the load. 16. A method for controlling three-phase electrical power, the power having a polarity and power frequency, the method comprising:providing 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;reversing the polarity of each phase of electrical power at a first frequency;applying the reversing polarity electrical power through an at least two-winding transformer having a set of primary terminals and a set of secondary terminals for each phase of electrical power, the primary terminals being configured to receive the reversing polarity electrical power, the secondary terminals being configured to induce an electrical power having a voltage and a current;generating a phase-angle-modulated first signal at the first frequency to correspond with each phase of the three-phase power;reversing the polarity of each phase of the induced electrical power according to the generated phase-angle-modulated first signal; andapplying the induced electrical power to a load. 17. The method of claim 16, wherein providing three-phase electrical power includes filtering the three-phase electrical power to remove ripple. 18. The method of claim 16, wherein applying the induced electrical power includes integrating the induced electrical power. 19. The method of claim 16, wherein phase-angle modulation is based upon a predetermined value for a frequency of the induced electrical power applied to the load. 20. The method of claim 16, wherein applying the induced electrical power to a load includes applying three-phase power to a load in delta connection. 21. The method of claim 16, wherein applying the induced electrical power to a load includes applying three-phase power to a load in series connection such that single-phase electrical power is applied to the load. 22. The method of claim 16, wherein the induced electrical power is applied to the load at a frequency of substantially zero, such that direct current is applied to the load. 23. The method of claim 16, wherein generating a phase angle modulated first signal further includes scaling the second signal to regulate amplitude of the three-phase electrical power applied to the load. 24. The method of claim 16, wherein applying the reversing polarity electrical power includes providing reversing polarity electrical power to a power bus and receiving reversing polarity electrical power from the power bus, and applying the reversing polarity electrical power received from the power bus to the at least two-winding transformer. 25. The method of claim 24, wherein the at least two-winding transformer includes a plurality of two-winding transformers and wherein the load is a plurality of loads. 26. The method of claim 16, wherein the induced electrical power is applied to a plurality of loads. 27. The method of claim 26, wherein a plurality of phase-angle-modulated first signals is generated, each first signal being generated according to one of the plurality of loads. 28. A universal mode power controller, the controller comprising:a primary clock configured to generate a clock signal;a secondary clock configured to phase-shift the clock signal to generate a phase-shifted clock signal;a primary gating array, the primary gating array having primary input terminals and primary output terminals and configured to periodically reverse power received at the primar y input terminals and presented at the primary output terminals according to the clock signal;a transformer having at least two windings and having primary transformer terminals and secondary transformer terminals, the primary transformer terminals being electrically connected to the primary output terminals; anda secondary gating array, the secondary gating array having secondary input terminals and secondary output terminals and configured to periodically reverse power received at the secondary input terminals and presented at the secondary output terminals according to the phase-shifted clock signal, the secondary input terminals being electrically connected to the secondary transformer terminals. 29. The controller of claim 22, wherein, the secondary clock phase-shifts the clock signal according to a modulating sinusoid. 30. The controller of claim 23, wherein the modulating sinusoid is configured to produce power presented at the secondary output terminals having a predetermined frequency. 31. The controller of claim 24, wherein the predetermined frequency is selected to optimize an output frequency. 32. The controller of claim 25, wherein the desired frequency is around zero.
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