r. f. Remote controller for electrical loads having resistive or complex impedances

• US 4,935,736 A
• Filed: 01/20/1988
• Issued: 06/19/1990
• Est. Priority Date: 01/20/1988
• Status: Expired due to Fees

• Current Assignee: Merit Electronic Design Co. Ltd.
• Original Assignee: Merit Electronic Design Co. Ltd.
• Inventors: Meierdierck, Charles
• Primary Examiner(s): Weldon, Ulysses
• Application Number:
  US07/146,110
• Time in Patent Office: 881 Days
• Field of Search: 340/825.69, 340/825.72, 340/539, 340/696, 340/825.71, 340/825.76, 49/25, 49/31, 318/16, 341/176, 332/109-111, 455/603
• US Class Current: 340/12.11
• CPC Class Codes: G08C 19/28 using pulse code

Abstract

Apparatus and method for remotely controlling electrical loads having resistive or complex impedances. The apparatus features a controller having a transmitter and a companion receiver. The transmitter is preferably hand-held and includes a command generator at which commands are selected; a modulator responsive to the command signals for generating modulation signals containing the load control information; an oscillator responsive to the modulation signals for generation short-duration bursts of r.f. carrier whose positions in time convey the load control information; and an antenna for radiating the modulated, r.f. carrier. The receiver includes an antenna responsive to the transmitter; a detector responsive to the receiver antenna for generating signals corresponding to the transmitter modulation signals; a converter responsive to the detector signals for changing the detector signals to a form convenient for processing; a decoder responsive to the converter for generating load control signals; and a driver connected to the loads and responsive to the control signals for implementing the commands selected at the transmitter. The method includes steps for generating command signals including control data; generating short-duration modulation signals in response to the command signals; varying the amplitude of an r.f. carrier with the modulation signal to generate bursts of r.f. carrier having positions in time that convey the load control information and, thereafter, radiating the r.f. carrier. Additionally the method includes steps for receiving the modulated carrier; demodulating the carrier; converting the detector signal for processing; decoding the load control information; and generating load control signals for driving the loads.

Claims

1. A remote controller for controlling one or more electrical loads, the loads having resistive or complex impedances, the controller comprising:

a. transmitter means for transmitting modulated r.f. signals, the transmitter including;

i. command generator means for generating command signals containing load control data, the command signals including sequences of pulses, wherein each pulse is produced within a fixed time interval, and has a width defined by the leading and trailing edges thereof that is variable within the fixed interval;

ii. oscillator means for generating r.f. oscillator signals;

iii. modulator means responsive to the command signals for generating modulation signals to vary the oscillator signal amplitude at points in time corresponding approximately to the leading and trailing edges of the command signal pulses such that the amplitude of the oscillator signal between the points in time corresponding approximately to the leading and trailing edges of the command signal pulses is reduced relative to the amplitude of the oscillator signals at points in time corresponding approximately to the leading and trailing edges of the command signal pulses;

iv. transmitter antenna means responsive to the oscillator signals for radiating the modulated r.f. oscillator signals; and

b. receiver means responsive to the r.f. signals radiated by the transmitter, the receiver means including;

i. receiver antenna means for receiving the signals radiated by the transmitter and supplying signals that correspond to the modulated oscillator r.f. signals;

ii. detector means responsive to the receiver antenna means signals for demodulating the receiver antenna means signals and generating detector signal corresponding to the transmitter modulation signals which contain load control data;

iii. decoder means, responsive to the detector signals for generation load control signals corresponding to the control data contained in the detector signals; and

iv. driver means responsive to the decoder signals for driving the loads in accordance with the load data.

2. The controller of claim 1 wherein the modulator means varies the oscillator signal amplitude such that the portions of the oscillator signals of reduced amplitude during the command signal pulses are spaced approximately equally between the points in time corresponding approximately to the leading and trailing edges of the command signal pulses and wherein the receiver further includes converter means responsive to the detector signals for converting the detector signals into signals which are pulse-width modulated and which contain load control data corresponding to the load control data contained in the control signals of the command generator means, and wherein the receiver decoder means is responsive to the converter signals for generating load control signals corresponding to the control data contained in the converter signals.

3. The controller of claim 2 wherein the converter means includes signal filter means for rejecting detector signals not corresponding to the transmitter modulation signals.

4. The controller of claims 3 wherein the converter means includes wave shaping means to provide the detector signals passed by the filter means with shapes corresponding to those of the modulation signals.

5. The controller of claim 4 wherein the modulation signals are in the form of pulses having a position in time corresponding to the leading and trailing edges of the pulses of the pulse width modulated signals produced by the command generator means.

6. The controller of claim 5 wherein the signal filter means includes filtering elements selected to pass detector signal pulses having shapes and position in time corresponding to the pulses of the modulation signals and reject detector signal pulses not having shapes and positions in time correspond to the pulses of the modulation signals.

7. The controller of claim 6 wherein the converter means includes signal transforming means for converting the filtered and shaped detector signals into pulse-width modulated signals corresponding to the pulse-width modulated command signals of the command generator means, wherein the widths of the converter signal pulses are determined by the position in time of the filtered and shaped detector signal pulses.

8. The controller of claims 7 wherein the signal transforming means includes flip-flop means.

9. The controller of claim 8 wherein the wave shaping means includes an operational amplifier having one input electrically coupled to the filter means and one input coupled to a reference signal means.

10. The controller of claim 7 wherein the decoder means includes universal asynchronous receiver circuits that are responsive to the pulse-width modulated converter signals to produce multibit, parallel, digital, data word signals having a data content corresponding to the load control data of the transmitter command signals.

11. The controller of claim 10 wherein the decoder means includes address storage means containing address data to identify the receiver, the decoded means also including address comparison means responsive to the received address signals and the pulse-width modulated signals of the converter means to identify converter signals corresponding to the command signals intended for the receiver and its associated loads.

12. The controller of claim 11 wherein the detector means includes a superregenerative detector means.

13. The controller of claim 2 wherein the command generator means includes command selector means to permit a user to select command signals.

14. The controller of claim 13 wherein the command selector means generates multibit, parallel, digital, data word signals containing load control data, and wherein the command generator means includes universal asynchronous transmitter circuits responsive to the signals of the command selection means, to produce pulse-width modulated, serial, coded command signals containing the load command data.

15. The controller of claim 14 wherein the command generator means includes address entry means to permit the inclusion of receiver address code data in the pulse-width modulated command signals.

16. The controller of claim 15 wherein the command selector means includes key pad means.

17. The controller of claim 15 wherein the modulator means includes signal differentiator means responsive to the pulse-width modulated command signals for producing pulse signals whose position in time corresponds to the leading and trailing edges of the pulse-width modulated command signals, the signal differentiator means being coupled to the oscillator means to turn the oscillator means on during the differentiator signal pulses and turn the oscillator means off between the differentiator signal pulses.

18. A transmitter means for use in a remote controller the remote controller being adapted to control one or more electrical loads having resistive or complex impedances, the transmitter comprising:

a. command generator means for generating coded command signals containing load control data, the command signals including sequences of pulses wherein each pulse is produced within a fixed time interval and has a variable pulse width within the interval;

b. oscillator means for generating r.f. oscillator signals;

c. modulator means responsive to the command signals for generating modulation signals to vary the oscillator signal amplitude at points in time corresponding approximately to the leading and trailing edges of the command signal pulses such that the amplitude of the oscillator signal between the points in time corresponding approximately to the leading and trailing edges of the command signal pulses is reduced relative to the amplitude of the oscillator signals at points in time corresponding approximately to the leading and trailing edges of the command signal pulses; and

d. antenna means coupled to the oscillator means for radiating the modulated r.f. oscillator signals.

19. Transmitter means in accordance with claim 18 wherein the command generator means includes command selector means for generating multibit, parallel, digital data word signals containing load control data, the command generator means also including universal asynchronous transmitter circuits responsive to the command selector means signals for generating pulse-width modulated, serial, coded command signals containing load data, and wherein the modulator means varies the oscillator signal amplitude such that the portions of the oscillator signal of reduced amplitude during the command signal pulses are spaced approximately equally between the points in time corresponding approximately to the leading and trailing edges of the command signal pulses.

20. Transmitter means in accordance with claim 19 wherein the modulator means includes signal differentiator means responsive to the pulse-width modulated command signal for producing pulsed differentiator signals wherein the position of the differentiator signal pulses correspond approximately in time to the leading and trailing edges of the pulse-width modulated command signals, the signal differentiator means being coupled to the oscillator means such that the oscillator means is turned on during the differentiator signal pulses and turned off between the differentiator signal pulses.

21. Transmitter means in accordance with claim 20 wherein the command selector means includes key pad means.

22. Receiver means for use in a remote controller, the remote controller being adapted to control one or more electrical loads having resistive or complex impedances by producing coded command signals containing the load control data, the command signals including sequences of pulses wherein each pulse is produced within a fixed time interval and has a variable pulse width within the interval, the receiver means comprising:

a. antenna means for receiving modulated r.f. signals containing coded command signals including load control data, and, thereafter, generating signals among which are included signals corresponding to the received modulated r.f. signals;

b. detector means responsive to the antenna signals for demodulating the antenna signals and generating detector signals having pulses whose positions in time correspond approximately to the leading and trailing edges of the command signal pulses;

c. decoder means responsive to the detector signals for generating decoder signals containing load control data contained in the detector signals; and

d. driver means responsive to the decoder signals for driving the loads in accordance with the received load control data.

23. The receiver means of claim 22 wherein the detector signals generated at approximately the leading and trailing edges of the command signal pulses are of approximately equal duration and wherein the receiver means further includes a converter means responsive to the detector signals for converting the detector signals into pulse-width modulated converter signals containing the load control data corresponding to the load control data of the command signals;

and wherein the decoder means is responsive to the converter signals.

24. The receive means of claim 23 wherein the detector signals are in the form of sequential pulses having positions in time corresponding to the leading and trailing edges of the command signal pulses.

25. The receiver in claim 24 wherein the signal converter means includes signal filter means having filtering elements selected to pass detector means pulses having pulse widths and pulse positions within predetermined ranges and reject detector means signals having pulse widths and pulse positions outside predetermined ranges.

26. The receiver means of claim 25 wherein the signal converter means includes wave shaping means to give the detector signals passed by the filter means the form of substantially rectangular pulses.

27. The receiver of claim 26 wherein the signal converter means includes signal transformer means to convert the filtered and shaped detector signals into the pulse-width modulated signals.

28. The receiver of claim 27 wherein the transformer means includes flip-flop means.

29. The receiver of claim 27 wherein the decoder means includes universal asynchronous receives circuits that are responsive to the pulse-width modulated converter means signal to produce multibit, serial, digital data word signals having a data content corresponding to the control data of the received command signals, and wherein the decoder means includes address storage means containing receiver address data, for generating receiver address signals, the decoder means also including address comparison means responsive to the receiver address signals and the pulse-width modulated signals of the converter means to identify converter signals intended to control loads associated with the receiver.

30. A method for remotely controlling one or more electrical loads having resistive or complex impedances using r.f. control signals, the method comprising:

a. generating coded command signals including load control data, the coded command signals being in the form of sequences of pulse-width modulated pulses provided within fixed time intervals;

b. generating modulation signals having pulses whose position in time corresponds approximately to the leading and trailing edges of the pulse-width modulated command signals;

c. generating r.f. signals whose amplitude is modulated at points in time corresponding to the pulses of the modulation signals so that the amplitude of the oscillator signal between the modulation pulses is reduced relative to the amplitude of the oscillator signal during the modulation pulses;

d. radiating the modulated r.f. signals;

e. receiving the modulated r.f. signals proximate the loads to be controlled;

f. demodulating the r.f. signals received and generating detection signals having pulses whose position in time correspond to the pulses of the modulated signals;

h. driving the loads in accordance with the control data of the load command signals.

31. The method of claim 30, wherein the modulation signal pulses generated at approximately the leading and trailing edges of the command signal pulses are generated so that they have approximately equal durations and wherein following generation of the detection signals, the detection signals are converted to pulse-width modulated pulse signals, the width of which are determined by the approximate time between the pulses of the detection signals, to generate a signal corresponding to the command signals, and wherein the converted detection signals are decoded to generate the load control signals.

32. The method of claim 31 wherein converting the detection signals to the pulse-width modulated signals includes filtering the detection signals, which are in the form of pulses, to permit passage of signals having pulse widths and pulse positions are within a range corresponding approximately to the pulse widths and pulse positions anticipated for the modulation signals, and rejecting detection signals not having pulse widths and pulse positions approximately within a range anticipated for the modulation signals.

33. The method of claim 32 wherein the converting of the detection signals to the pulse-width modulated signals includes shaping the filtered detection signal pulses to a substantially rectangular form.

34. The method of claim 33 wherein the wave shaping of the filtered detection signals includes comparing the filtered detection signals to a reference signal and transmitting a predetermined signal amplitude during the time period the absolute value of the filtered detection signals exceed the reference signal.

35. The method of claim 30 wherein the modulation signals are produced by generating a pulse of predetermined width at the leading and trailing edges of the pulse-width modulated command signal pulses.

36. The method of claim 35 wherein r.f. signals are generated during the predetermined pulse width of the modulation signal pulses and wherein r.f. signals are not generated during the time interval between that trailing edge and leading edge of sequential modulation signal pulses.