Method and apparatus for communicating control and other information over a power bus
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60Q-001/00
출원번호
US-0060590
(2005-02-18)
등록번호
US-7304567
(2007-12-04)
발명자
/ 주소
Canfield,Eric L.
출원인 / 주소
nth Solutions, LLC
대리인 / 주소
Nixon & Vanderhye PC
인용정보
피인용 횟수 :
10인용 특허 :
29
초록▼
An information signal to be communicated to a roof-mounted light bar or other electrical or electronic device travels over the vehicle's or other environment's power bus or other power conductor. In one exemplary illustrative non-limiting implementation, a modulated current load draws power supply c
An information signal to be communicated to a roof-mounted light bar or other electrical or electronic device travels over the vehicle's or other environment's power bus or other power conductor. In one exemplary illustrative non-limiting implementation, a modulated current load draws power supply current in an amount that is instantaneously responsive to at least some characteristic of the information signal to be communicated. This modulated current loading induces the vehicular or other power supply (e.g., DC battery) to modulate its output voltage in a manner that is responsive to the modulated current loading. A voltage sensor and demodulator also connected to the power bus senses the resulting voltage fluctuations and demodulates those fluctuations to recover or regenerate the original information signal. The recovered information signal may be used for any purpose including but not limited to controlling aspects of the operation of an emergency vehicle light bar or other audible and/or visual warning system or other device. The data sender and data receiver can be co-located to provide a full duplex or half duplex powerline communicated transceiver.
대표청구항▼
I claim: 1. In a vehicle including a finite power source connected to a vehicle power bus, said power bus delivering power from said finite power source to electrical devices mounted on said vehicle, a method of communicating control signaling over said vehicle power bus while said bus is carrying
I claim: 1. In a vehicle including a finite power source connected to a vehicle power bus, said power bus delivering power from said finite power source to electrical devices mounted on said vehicle, a method of communicating control signaling over said vehicle power bus while said bus is carrying power to said devices, said method comprising: using an information signal to control a current load coupled to said finite power source to thereby modulate the current drawn by said current load in response to said information signal, said modulated current load changing the electrical load on said finite power source to thereby induce voltage fluctuations on said power bus that are in response to said information signal; sensing said induced voltage fluctuations on said power bus; and demodulating said sensed induced voltage fluctuations to recover said information signal. 2. The method of claim 1 further including controlling a device to generate an audible indication in response to said information signal. 3. The method of claim 2 wherein said audible indication comprises a siren. 4. The method of claim 2 further including controlling a device to generate a visible indication in response to said information signal. 5. The method of claim 2 wherein said visible indication comprises flashing alternating lights. 6. The method of claim 2 wherein said visible indication comprises providing a rotating light. 7. The method of claim 1 further including generating illumination at least in part in response to said sensed voltage fluctuations. 8. The method of claim 1 further including selectively interrupting at least one connection between said power bus and at least one additional load to reduce noise on said power line during data transmission. 9. The method of claim 1 wherein said modulating includes pulse width modulating said current load. 10. The method of claim 1 wherein said modulating includes frequency modulating said current load. 11. The method of claim 1 wherein said modulating includes phase shift modulating said current load. 12. The method of claim 1 wherein said modulating includes frequency shift key modulating said current load. 13. The method of claim 1 wherein said sensing comprises deriving at least some characteristics of said information signal from said sensed voltage fluctuations. 14. The method of claim 1 wherein said sensing is performed at a node on said power bus that is remote from said power source. 15. The method of claim 1 further including producing said information signal, at least in part in response to user manipulation of at least one user-manipulable control. 16. The method of claim 1 wherein said modulating includes modulating said current load with at least one of a square, sine, triangle or saw tooth wave. 17. In a vehicle including a finite power source connected to a power bus, a method of using said power bus to communicate control signaling to a device mounted on said vehicle, said method comprising: using an information signal to modulate a current sink coupled to said power source at least in part in response to a control signal, said modulated current sink inducing voltage fluctuations at said power source that are in response to said information signal; sensing said voltage fluctuations on said power bus; and demodulating said sensed voltage fluctuations to recover said information signal, wherein said causing step comprises causing said battery type power supply to act as a power-reactive voltage mirror of induced modulation. 18. The method of claim 1 further including increasing signal to noise ratio by intermittently removing at least some current-drawing loads from said power bus. 19. In a vehicle including a finite power source connected to a power bus, a method of using said power bus to communicate power and control signaling to a device mounted on said vehicle, said method comprising: means coupled to a power bus for using an information signal to modulate a current load at least in part in response to a control signal, said modulated current load inducing voltage fluctuations that are at least in part in response to said information signal, to thereby cause said power source to act as a power-reactive voltage mirror of induced modulation; means coupled to said power bus for sensing said voltage fluctuations on said power bus; and means coupled to said sensing means for demodulating said sensed voltage fluctuations to recover said information signal. 20. A method of using a power source connected to a power bus to communicate power and information to a device coupled to said power bus, said method comprising: using an information signal to modulate a current load coupled to said power source, said modulated current load inducing voltage fluctuations that are in response to said information signal, to thereby cause said power source to act as a power-reactive voltage mirror of induced modulation; sensing said voltage fluctuations on said power bus; and demodulating said sensed voltage fluctuations to recover said information signal. 21. In a vehicle of the type including at least one substantially resistive electrical load switchably connected to a power bus, a method of communicating information within said vehicle comprising: controllably disconnecting said substantially resistive load from said power bus at least in part in response to an information signal, thereby inducing voltage fluctuations on said power bus; selectively and temporarily decoupling at least one additional load from said power bus during induction of at least some of said voltage fluctuations, thereby reducing noise present on said power bus while said power bus is being used for data communications; and capturing and demodulating said voltage fluctuations to at least in part recover said information signal. 22. The method of claim 21 wherein said substantially resistive load comprises a current modulated load. 23. The method of claim 21 wherein a battery is connected to supply current to said power bus, and disconnection of said substantially resistive load causes the battery to modulate its voltage output in a way that is responsive to the current drawn by the switched resistive load. 24. The method of claim 21 further including a power source connected ot said power bus, and wherein said load switching causes said power source to act as a power-reactive voltage mirror of induced modulation. 25. The method of claim 21 wherein said additional load comprises at least one noisy load that induces noise on said power bus during operation of said noisy load. 26. The method of claim 21 wherein said additional load, when operating, generates a humanly perceivable indication, and said decoupling disconnects said additional load from said power bus in a way so as not to substantially impact human perception of said indication.
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