Multiplexing drive circuit for an AC ignition system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02P-005/00
F23Q-003/00
출원번호
US-0542794
(2009-08-18)
등록번호
US-8276564
(2012-10-02)
발명자
/ 주소
Petruska, David C.
출원인 / 주소
Woodward, Inc.
대리인 / 주소
Reinhart Boerner Van Deuren P.C.
인용정보
피인용 횟수 :
1인용 특허 :
13
초록▼
A multiplexing drive circuit for an AC ignition system having a common leg that includes two switches coupled in series, and one or more dedicated legs, wherein each leg includes two switches coupled in series. The multiplexing drive circuit also includes a transformer for each of the one or more de
A multiplexing drive circuit for an AC ignition system having a common leg that includes two switches coupled in series, and one or more dedicated legs, wherein each leg includes two switches coupled in series. The multiplexing drive circuit also includes a transformer for each of the one or more dedicated legs, each transformer having a primary winding coupled between one of the one or more dedicated legs and the common leg, and wherein each transformer has a secondary winding coupled in parallel to a spark plug, and a pulse-width modulated (PWM) switch controller configured to operate the common leg and dedicated leg switches to control characteristics of the spark discharge for the spark plug.
대표청구항▼
1. A multiplexing drive circuit for an AC ignition system module comprising: a common leg that includes two switches coupled in series;one or more dedicated legs, wherein each dedicated leg includes two switches coupled in series;a transformer for each of the one or more dedicated legs, each transfo
1. A multiplexing drive circuit for an AC ignition system module comprising: a common leg that includes two switches coupled in series;one or more dedicated legs, wherein each dedicated leg includes two switches coupled in series;a transformer for each of the one or more dedicated legs, each transformer having a primary winding coupled between one of the one or more dedicated legs and the common leg, and wherein each transformer has a secondary winding coupled in parallel to a spark plug;a pulse-width modulated (PWM) switch controller configured to operate the common leg and dedicated leg switches to control characteristics of the spark discharge for the spark plug. 2. The multiplexing drive circuit of claim 1, wherein the one or more dedicated legs comprise two dedicated legs. 3. The multiplexing drive circuit of claim 1, wherein the one or more dedicated legs comprise three dedicated legs. 4. The multiplexing drive circuit of claim 1, further comprising a DC-to-DC boost converter configured to provide electrical energy to generate the spark discharge. 5. The multiplexing drive circuit of claim 1, wherein the switches are one of N-channel FETs and MOSFETs. 6. The multiplexing drive circuit of claim 5, wherein each switch is coupled to a diode in anti-parallel. 7. The multiplexing drive circuit of claim 1, wherein the switch controller uses high-frequency pulse width modulation, wherein controlling the shared and dedicated switches comprises controlling spark discharge characteristics for the plurality of spark plugs; and wherein the controller is configured to alter the characteristics of a particular spark discharge while the spark discharge is taking place. 8. The multiplexing drive circuit of claim 1, wherein the spark discharge time can be programmed to have a duration of 0.1 millisecond to 4 milliseconds, and the secondary winding current amplitude is programmed to have a range of 50 milliamps to 1000 milliamps. 9. The multiplexing drive circuit of claim 1, wherein each transformer has a primary inductance of approximately 109 microhenries, and a secondary inductance of approximately 3.7 henries. 10. The multiplexing drive circuit of claim 9, wherein each transformer has a primary leakage inductance of approximately 28 microhenries, and a secondary leakage inductance of approximately 0.95 henries. 11. The multiplexing drive circuit of claim 10, wherein each transformer has a primary coupling factor of approximately 0.8630, and a secondary coupling factor of approximately 0.8630. 12. The multiplexing drive circuit of claim 11, wherein each transformer oscillates at approximately 12 kHz to 55 kHz as the output current level goes from 300 mA (rms) to 65 mA (rms). 13. The multiplexing drive circuit of claim 1, wherein each transformer has a primary inductance of approximately 246 microhenries, and a secondary inductance of approximately 8.1 henries, and wherein each transformer has a primary leakage inductance of approximately 61 microhenries, and a secondary leakage inductance of approximately 2.04 henries. 14. The multiplexing drive circuit of claim 13, wherein each transformer has a primary coupling factor of approximately 0.8672, and a secondary coupling factor of approximately 0.8651, wherein each transformer oscillates at approximately 5 kHz to 29 kHz as the output current level goes from 300 mA (rms) to 65 mA (rms). 15. The multiplexing drive circuit of claim 1, wherein the common leg switches and the dedicated leg switches are operated to generate a flow of alternating current through each of the secondary windings. 16. The multiplexing drive circuit of claim 1, wherein spark discharge in a spark plug is terminated by opening the two common leg switches and the two dedicated leg switches for that spark plug. 17. A programmable AC ignition system module comprising: a DC electrical bus;a plurality of spark plugs, each coupled to a secondary winding of a respective transformer, wherein each transformer includes a primary winding having a first terminal coupled between a respective pair of dedicated switches coupled in series;a pair of shared switches coupled in series wherein a second terminal of each primary winding is coupled between the shared switches;wherein the shared switches and each of the dedicated switches are coupled to the DC bus; anda programmable controller configured to operate the shared switches and dedicated switches using pulse width modulation, wherein controlling the shared and dedicated switches comprises controlling spark discharge characteristics for the plurality of spark plugs. 18. The AC ignition system module of claim 17, further comprising a boost converter configured to output a DC voltage to the DC bus. 19. The AC ignition system of module claim 17, wherein controlling the spark discharge characteristics comprises independent control of current amplitude and spark discharge period. 20. The AC ignition system module of claim 17, wherein the shared switches and dedicated switches are MOSFETs, and wherein each MOSFET is coupled to a diode in anti-parallel. 21. The AC ignition system module of claim 17, wherein the shared switches are coupled to the primary windings of at least two transformers. 22. The AC ignition system module of claim 17, wherein the share switches are coupled to the primary windings of at least three transformers. 23. The AC ignition system module of claim 17, wherein each transformer has a primary inductance of approximately 109 microhenries, and a secondary inductance of approximately 3.7 henries, and wherein each transformer has a primary leakage inductance of approximately 28 microhenries, and a secondary leakage inductance of approximately 0.95 henries. 24. The AC ignition system module of claim 23, wherein each transformer has a primary coupling factor of approximately 0.8630, and a secondary coupling factor of approximately 0.8630, and wherein each transformer oscillates at approximately 12 kHz to 55 kHz as the output current level goes from 300 mA (rms) to 65 mA (rms). 25. The AC ignition system module of claim 17, wherein each transformer has a primary inductance of approximately 246 microhenries, and a secondary inductance of approximately 8.11 henries. 26. The AC ignition system module of claim 25, wherein each transformer has a primary leakage inductance of approximately 61 microhenries, and a secondary leakage inductance of approximately 2.04 henries. 27. The AC ignition system of module claim 26, wherein each transformer has a primary coupling factor of approximately 0.8672, and a secondary coupling factor of approximately 0.8651. 28. The AC ignition system module of claim 27, wherein each transformer oscillates at approximately 5 kHz to 29 kHz as the output current level goes from 300 mA (rms) to 65 mA (rms). 29. The AC ignition system module of claim 17, wherein the shared switches and dedicated switches are IGBTs, and wherein each IGBT is coupled to a diode in anti-parallel. 30. The AC ignition system module of claim 17, wherein the controller uses high-frequency pulse-width modulation to control the shared switches and dedicated switches, and wherein the controller is configured to alter the characteristics of a particular spark discharge while the spark discharge is taking place. 31. The AC ignition system module of claim 29, wherein the spark discharge time is programmed to have a duration of from 0.1 millisecond to 4 milliseconds. 32. A 16-channel ignition system comprising: four three-channel ignition system modules and two two-channel ignition system modules, wherein each ignition system module comprises: a DC electrical bus;a plurality of spark plugs, each coupled to a secondary winding of a respective transformer, wherein each transformer includes a primary winding having a first terminal coupled between a respective pair of dedicated switches coupled in series;a pair of shared switches coupled in series wherein a second terminal of each primary winding is coupled between the shared switches;wherein the shared switches and each of the dedicated switches are coupled to the DC bus; anda programmable controller configured to operate the shared switches and dedicated switches in each of the ignition system modules using pulse width modulation, wherein controlling the shared and dedicated switches comprises controlling spark discharge characteristics for the plurality of spark plugs. 33. The 16-channel ignition system of claim 32, wherein the programmable controller is an FPGA. 34. The 16-channel ignition system of claim 32, wherein the system has 32 dedicated switches and 12 shared switches.
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이 특허에 인용된 특허 (13)
Gerry Martin E. (13452 Winthrope St. Santa Ana CA 92705), Alternating current energized ignition system.
Goras Anders,SEX ; Nytomt Jan,SEX, Arrangement and process for communication between an ignition module and control unit in a combustion engine's ignition system.
Bengtsson, Jorgen; Gustafsson, Bert, Ignition system including a measurement device for providing measurement signals to a combustion engine's control system.
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