[특허]Data communication in a multi-wire irrigation control system

[미국특허] Data communication in a multi-wire irrigation control system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G05D-007/00 A01G-025/00 H04B-003/00 H04L-025/00 H04L-007/00 H03C-005/00 H03K-007/02 H03K-009/02
출원번호	US-0570139 (2012-08-08)
등록번호	US-8532831 (2013-09-10)
발명자 / 주소	Crist, Timothy J.
출원인 / 주소	Rain Bird Corporation
대리인 / 주소	Fitch, Even, Tabin and Flannery, LLP
인용정보	피인용 횟수 : 8 인용 특허 : 93

초록 ▼

An irrigation control device having a modulator that modulates data onto an alternating power signal by distorting amplitude of a first leading portion of selected cycles of the alternating power signal, and permit effectively a full amplitude of the alternating power signal on a following portion of the selected cycles, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal. The irrigation control device further includes an interface configured to couple the modulator to a multi-wire interface coupled to a plurality of irrigation devices to permit the alternating power signal to be applied to the multi-wire interface.

대표청구항 ▼

1. A method for use in an irrigation system, the method comprising: receiving an alternating power signal comprising cycles each having a first leading portion and a following portion, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal;demodulating data represented by the alternating power signal based upon whether the first leading portion of a cycle of the alternating power signal has an amplitude that is distorted and where the following portion has an amplitude that is undistorted; andderiving power from the alternating power signal to charge an energy reserve associated with each of a plurality of irrigation devices. 2. The method of claim 1, wherein the alternating power signal comprises the data modulated onto the alternating power signal with the distortion on the amplitude of the first leading portion of selected cycles of the alternating power signal and with a full amplitude of the alternating power signal on a following portion of the selected cycles, wherein the first leading portion and the following portion of the selected cycles are either both on the high side of a cycle or both on the low side of a cycle of the alternating power signal; andwherein the receiving the alternating power signal comprises receiving the alternating power signal over a multi-wire interface configured to couple with the plurality of irrigation devices. 3. The method according to claim 2, wherein the distortion of the amplitude comprises a clipping of the first leading portion. 4. The method according to claim 2, wherein the leading portion and the following portion occur within a half cycle of the alternating power signal. 5. The method according to claim 2, wherein the leading portion and the following portion are both on the high side of the alternating power signal. 6. The method of claim 2 wherein the amplitude of the first leading portion over the first leading portion of the selected cycles of the alternating power signal are continuously distorted. 7. The method of claim 2 wherein the first leading portion is only on a positive side of the alternating power signal. 8. The method of claim 1, wherein the receiving the alternating power signal comprises receiving the alternating power signal through an interface configured to receive the alternating power signal; and wherein the demodulating the data represented by the alternating power signal comprises demodulating the data through a demodulator configured to provide the data by demodulating the alternating power signal based upon whether the first leading portion of the cycle of the alternating power signal has the amplitude that is distorted and where the following portion has the amplitude that is undistorted. 9. A method for use in an irrigation system, the method comprising: receiving, at an irrigation device, an alternating power signal comprising cycles, where an amplitude of a portion of each cycle is selectively distorted to modulate data on the alternating power signal;determining a slope of the portion of each cycle; anddemodulating the data based upon the determining the slope. 10. The method of claim 9 wherein the determining the slope step comprises: taking a first voltage measurement of the alternating power signal at a first time during the portion of each cycle of the waveform;taking a second voltage measurement of the alternating power signal at a second time during the portion of each cycle of the waveform, the second time being a defined amount of time after the first time;obtaining a difference between the first voltage measurement and the second voltage measurement;dividing the difference by the defined amount of time to determine the slope. 11. The method of claim 10 wherein the demodulating the data step comprises: analyzing, for each cycle, the slope having been determined;decoding the cycle to equate to a logic “0” in the event the slope is a small positive value or a small negative value; anddecoding the cycle to equate to a logic “1” in the event the slope is a large positive value.

이 특허에 인용된 특허 (93) 인용/피인용 타임라인 분석

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[미국특허] Data communication in a multi-wire irrigation control system 원문보기

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