[특허]Resonant commutation system for exciting a three-phase alternator

Resonant commutation system for exciting a three-phase alternator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-009/00 H02P-009/02 H02P-009/04 H02P-009/30
출원번호	US-0286031 (2014-05-23)
등록번호	US-9369075 (2016-06-14)
발명자 / 주소	Albsmeier, Eric D.
출원인 / 주소	Kohler Co.
대리인 / 주소	Michael Best & Friedrich LLP
인용정보	피인용 횟수 : 0 인용 특허 : 28

초록 ▼

An alternator has a field coil that produces a magnetic field which induces electricity in a coil arrangement. A field coil excitation system includes a generator with an output coil assembly for producing alternating electricity. A rectifier converts the alternating electricity into voltage and direct current at two nodes. A capacitor, between the nodes, has capacitance that forms a resonant circuit with inductance of the output coil assembly. Due to that resonant circuit, the voltage and direct current oscillate in a predefined phase relationship. A switch and the field coil are connected in series between the nodes. A controller renders the switch conductive for a time period specified by a received control signal. The switch is rendered non-conductive at the first occurrence of a minimum current level after the time period ends. The predefined phase relationship enables the minimum current level to be detected by sensing the voltage.

대표청구항 ▼

1. A system for exciting a field coil of an alternator in order to produce a magnetic field that induces electricity in an alternator output coil assembly, the system comprising: a generator that has an excitation output coil assembly for producing alternating electricity;a rectifier having an input coupled to the excitation output coil assembly and an output, converting the alternating electricity into a direct current with an output voltage, and providing the direct current at the output;a capacitor connected to the output of the rectifier and having a capacitance that forms a resonant circuit with inductance of the excitation output coil assembly, wherein the resonant circuit causes the output voltage and direct current to vary cyclically;a switch connected in series with the field coil, the switch being operable to control application of the direct current to the field coil;a minimum current detector coupled to the output of the rectifier and operable to determine when the magnitude of the direct current is at a minimum level and in response thereto producing an indication; anda controller coupled to a control terminal of the switch and an output of the minimum current detector, the controller, in response to an excitation control signal, places the switch in a conductive state in which the direct current is applied to the field coil, and,in response to the indication received from the output of the minimum current detector, places the switch in a non-conductive state. 2. The system as recited in claim 1 wherein the resonant circuit has a resonant frequency equal to a fundamental frequency of the alternating electricity or a harmonic of the fundamental frequency. 3. The system as recited in claim 1 further comprising a flyback diode connected in parallel with the field coil. 4. The system as recited in claim 1 wherein the output voltage and the direct current are across terminals of the capacitor and have a predefined phase relationship in which the output voltage leads the direct current. 5. The system as recited in claim 1 wherein the output voltage and the direct current are across terminals of the capacitor and have a predefined phase relationship in which the output voltage leads the direct current by ninety degrees. 6. The system as recited in claim 1 wherein the minimum current detector includes a voltage sensor to detect a voltage level of the output voltage. 7. The system as recited in claim 1 wherein the minimum current detector includes a voltage averaging circuit that averages the output voltage to produce an average voltage level, anda comparator, wherein the comparator determines when the direct current has a minimum level in response to the output voltage having a predefined relationship to the average voltage level. 8. The system as recited in claim 7 wherein the comparator has a first input coupled to a voltage sensor anda second input coupled to the voltage averaging circuit,wherein the comparator provides a minimum current signal when the output voltage makes a transition across the average voltage level. 9. The system as recited in claim 7 wherein the comparator has a first input coupled to a voltage sensor anda second input coupled to the voltage averaging circuit,wherein the comparator provides a minimum current signal when the output voltage goes from being less than the average voltage level to being greater than the average voltage level. 10. The system as recited in claim 1 wherein the controller includes: an excitation control signal input that receives the excitation control signal, wherein the excitation control signal denotes a duty cycle for operation of the switch;a gate switch coupled to the output of the minimum current detector;conditioning elements coupled between the excitation control signal input and the gate switch; anda gate driver coupled between an output of the gate switch and the control terminal of the switch. 11. The system as recited in claim 1 wherein the switch is a field effect transistor.

이 특허에 인용된 특허 (28)

Tupper Christopher N., Apparatus for resonant excitation of high frequency alternator field.
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Bauer Michael E. (Fond du Lac WI), Control circuit for a generator.
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Kuehn ; Jr. Frederick J. (Erie PA) Laukaitis Joseph A. (Erie PA) McElhenny Stuart W. (Erie PA), Control system for a tertiary winding self-excited generator.
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Faberman,Ira S.; Koch,Stewart C.; Lafontaine,Charles Y.; Williams,Dave E.; Scott,Harold C., Controller for AC generator.
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Lapaev Kronid Vasilievich (Basseinaya ulitsa ; 85 ; kv. 10 Leningrad SU) Madorsky Lev Zalmanovich (Bolshoi prospekt ; 82 ; kv. 113 Leningrad SU) Osinin Mikhail Alexandrovich (Farforovsky post ; 70 ; , Device for automatic excitation of brushless electrical machines.
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Gorden Dale I. (Munhall PA), Fast de-excitation brushless exciter.
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Jackovich Melvin C. (Stillman Valley IL) Spencer William (Rockford IL) Thom James B. (Rock City IL), Generator shorted diode protection system.
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Hintz, David A.; Bornemann, Kenneth R., Method and apparatus for sensing variable currents within the alternator of a genset that employs an amplifier and a switched feedback resistance.
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Gerald Wesley Davis, Jr. ; Robert Thomas Wolfe, Method and apparatus for voltage regulation via pseudo-random PWM modulation.
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Cheng, Kuang-Yao, Method and circuit for controlling motor and brushless motor system using the same.
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Sarlioglu,Bulent; Huggett,Colin E., Method and system for providing single-phase excitation techniques to a start exciter in a starter/generator system.
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Freeman Richard A. (St. Louis MO) Massey David C. (Kirkwood MO), Microprocessor-controlled regulator.
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Kimura, Norihito; Tanaka, Katsunori, Output control apparatus and method for field winding type dynamo-electric machine.
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Urakabe, Takahiro; Okuda, Tatsuya; Iwata, Akihiko; Maekawa, Hirotoshi; Kobayashi, Masaru; Ikeda, Matahiko; Tsunoda, Yoshikazu; Kaneyuki, Kazutoshi; Tanaka, Yuya, Power supply apparatus.
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Aoyama, Toru, Power-generator control method and apparatus using externally applied periodic signal.
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MacFarlane Alistair A. (East Kilbride GB6), Regulated alternator with positive fault related shut down apparatus.
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Fuller, Randy; Yao, Yuan, Robust digital voltage regulator.
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Crecelius David R., Sensorless power angle control for a vehicle alternator.
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Gallegos-Lopez, Gabriel, Soft chopping for switched reluctance generators.
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Rozman Gregory I. (Rockford IL) Markunas Albert L. (Roscoe IL) Nuechterlein Paul E. (Rockford IL), Starter/generator system with variable-frequency exciter control.
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Lee,Kwang Woon; Kim,Dae Kyong; Lee,Sang Taek; Choi,Hyen Young, Startup control method of brushless DC motor.
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Ooiwa, Tooru, Vehicle-mounted alternator.
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Sims, Cecil W.; Hill, Arthur, Voltage regulator with independent peak and average voltage sensing.
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