Two-tone dimmer circuit

• US 4,749,917 A
• Filed: 05/05/1986
• Issued: 06/07/1988
• Est. Priority Date: 05/05/1986
• Status: Expired due to Fees

• Current Assignee: DIMMITT, CLIFFORD G., 1745 BRENTWOOD, TROY, MICHIGAN 48098
• Original Assignee: DIMMITT, CLIFFORD G., 1745 BRENTWOOD, TROY, MICHIGAN 48098
• Inventors: Angott, Paul G., Jacob, Keith D.
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): Razavi, Michael
• Application Number:
  US06/860,300
• Time in Patent Office: 764 Days
• Field of Search: 315/DIG. 4, 315/DIG. 5, 315/307, 315/291, 315/175, 315/199, 315/219, 315/220, 315/194, 315/DIG. 7
• US Class Current: 315/307
• CPC Class Codes: H05B 39/085 by touch control
• CPC Class Codes: H05B 47/14 by determining electrical parameters of the light source
• CPC Class Codes: Y10S 315/04 Dimming circuit for fluorescent lamps
• CPC Class Codes: Y10S 315/07 Starting and control circuits for gas discharge lamp using transistors

Abstract

The circuit includes a super regenerative detector (12) for receiving a modulated radio frequency signal from a transmitter. The output of the super regenerative detector is amplified and sent into a high frequency interpreter circuit (16, 18, 20) which de-modulates the signal creating an output of low frequency equal to the consecutive pulses frequency. The low frequency signal is received by a low frequency interpreter circuit (22, 24, 26) which outputs a digital signal of a single duration which is received by a counter circuit (30). The counter circuit (30) controls the firing of a triac (T1) to create lighting conditions of on, off and dimming.

Claims

1. A dimmer control circuit responsive to a remote radio signal transmitter for respectively turning on, off and dimming a light, said circuit comprising;

a super regenerative detector (12) for receiving a modulated radio frequency signal within a predetermined frequency range from the transmitter, light control means (10) connected between the light and an electrical power outlet and responsive to said detector (12) for independently controlling the electrical power supplied to the light in a series of stepped levels in response to the duration of said modulated radio frequency signal detected by said detector means, said circuit characterized by said light control means including high frequency (16, 18,

     20) and low frequency (22, 24,

     26) interpreter circuits in series responsive to said detector (12) for producing a digital signal, and a counter circuit (30) for establishng said stepped level from the duration of said digital signal to adjust the phase angle of a pulse to control the amount of power supplied to the light at said stepped level.

2. A circuit as set forth in claim 1 wherein said high frequency interpreter circuit (16, 18, 20) is connected between said super regenerative detector (12) and said low frequency interpreter circuit (22, 24, 26) for outputing a signal of low frequency having pulse duration equal to the duration of consecutive pulses of the high frequency input signal.

3. A circuit as set forth in claim 2 wherein said low frequency interpreter circuit (22, 24, 26) is connected between said high frequency interpreter circuit (16, 18, 20) and said counter circuit (30) for outputing said digital signal of a pulse equal in duration of the low frequency input signal which is proportional to the amount of dimming requested.

4. A circuit as set forth in claim 3 wherein said counter circuit (30) is connected to said low frequency interpreter circuit (22, 24, 26) and includes a triac (T1) and an integral circuit chip, said integral circuit chip (U7) acts as a counter proportional to the duration of the signal coming from said low frequency interpreter circuit (22, 24, 26) to establish the phase of firing of said triac (T3) to illuminate the light (32) at the requested lighting condition.

5. A circuit as set forth in claim 4 wherein said light control means includes a touch control means (34) connected to said counter circuit (30) for directly changing the light condition by touching a metal plate (36) on the lamp.

6. A circuit as set forth in claim 4 wherein said light control means includes an audio amplifier (14) connected between said super regenerative detector (12) and said high frequency interpreter (16, 18, 20) for amplifying the signal.

7. A circuit as set forth in claim 6 wherein said light control means includes a threshold detector (28) connected between said counter circuit (30) and said low frequency interpreter circuit (22, 24, 26) for ensuring that the magnitude of the signal is within a predetermined range for interpretation.

8. A circuit as set forth in claim 7 wherein said high frequency interpreter includes a limiter (16) for setting the signal magnitude within a predetermined range, a high tone filter (18) for filtering out frequencies above a predetermined allowable frequency, and a detector (20) for averaging the peaks of the high frequency to result in a low frequency signal with a pulse duration equal to the consecutive pulses of high frequency signal.

9. A circuit as set forth in claim 8 wherein said low frequency interpreter includes a limiter (22) for setting the signal magnitude within a predetermined range, a low tone filter (24) for filtering out frequencies below a predetermined allowable frequency (26), and a detector to for creating a signal of a single duration equal to the duration of the low frequency pulses indicative of the amount of dimming control.

10. A circuit as set forth in claim 9 wherein said light control means includes a power supply circuit (38) connected between said counter circuit (30) and the power leads for supplying power to said circuit and to the light (32) through said counter circuit.

11. A circuit as set forth in claim 10 wherein said super regenerative detector (12) includes a coupling inductor (L1) connected in parallel with a capacitor (C1), a capacitor (C2) connects the collector and emitter of a transistor (Q1), a resistor (R2) and a capacitor (C4) are in parallel which is connected to the base of the transistor (Q1), the collector of said transistor (Q) is connected to an inductor (L2) which is connected to a capacitor (C3) which is between two parallel resistors (R3, R4).

12. A circuit as set forth in claim 11 wherein said audio amplifier (14) includes an operational amplifier (U1) biased by three resistors (R6, R7, R8) connected to the inverting and noninverting inputs, said inputs separated by a capacitor (C9), said operational amplifier having inverting feedback through a resistor (R9).

13. A circuit as set forth in claim 12 wherein said limiter (16) of said high frequency interpreter circuit includes an operational amplifier (U2) with an inverting input connected to the output of the audio amplifier (14) and said noninverting input biased by a resistor (R10) and connected to the output of the audio amplifier (14), said high tone filter (18) includes an operational amplifier (U3) with inverting feed back to configure the filter which has a resistor (14) connected between two parallel capacitors (C10, C11) which are connected to the output of said limiter (16), and said detector (20) of said high frequency interpreter circuit includes a diode (D1) connected to te output of said high tone filter (18) which is connected to a capacitor (C13).

14. A circuit as set forth in claim 13 wherein said limiter (22) of said low frequency interpreter circuit includes an operational amplifier (U4) with noninverting feedback through a resistor (R20), said noninverting feedback is biased by two resistors (R18, R19) to the diode (D1) of the detector (20), said inverting input is biased by a pair of resistors (R15, R16) and a capacitor (C12), said low tone filter (24) includes an operational amplifier (U5) with inverting feedback through a resistor (R23) and parallel capacitors (C14, C15) which connects to the output of the limiter (22), with biasing resistors (R21, R22) connected to the inverting input, and said detector (26) of said low frequency interpreter circuit includes a diode (D2) connected to the output of said low tone filter (24) and connected to a capacitor (C16) and resistor (R24).

15. A circuit as set forth in claim 14 wherein said threshold detector (28) includes an operational amplifier (U6) with noninverting feedback through a resistor (R25), the inverting input is connected to the diode (D2) of said detector (26) of said low frequency interpreter circuit and the noninverting input is biased by a resistor (R27).

16. A circuit as set forth in claim 15 wherein said counter circuit includes an integrated circuit chip (U7) connected to the output of said threshold detector (28), and the output of said counter circuit is connected through a diode (D3) to said triac (T1).

17. A circuit as set forth in claim 16 wherein said power supply circuit (38) includes a resistor (R28) and capacitor (C8) connecting the power output leads and counter circuit (30), a capacitor (C17) connected to the integrated circuit chip (U7), a blocking diode (D6) and capacitor (C21) connected across the power leads, a zener diode (D5) and capacitor (C20) connected to an inductor (L3) and a diode (D4) and capacitor (C19) connected to ground.

18. A circuit as set forth in claim 17 wherein said light control means includes a touch control means (34) connected between said integral circuit chip (U7) and a metal touch plate (36) for direct control of said counter circuit (30) for responding to the duration of a digital signal.

19. A circuit as set forth in claim 18 wherein said touch dimmer includes a pair of large resisters (R30, R31) connected between a pin of said integrated circuit chip (U7) and a metal plate (36) designed for human contact, and a resistor (R29) and capacitor (C22) in shunt connected between said power supply circuit (38) and a pin of said integral circuit chip (U7).

20. A dimmer control circuit responsive to a remote radio signal transmitter for respectively turning on, off and dimming a light, said circuit comprising;

a super regenerative detector (12) for receiving a modulated radio frequency signal within a predetermined frequency range from the transmitter, a light control means (10) connected between the light and an electrical power outlet and responsive to said detector (12) for independently controlling the electrical power supplied to the light in a series of stepped levels in response to the duration of said modulated radio frequency signal detected by said detector means, said circuit characterized by said light control means including a counter circuit (30) and high frequency interpreter circuit (16, 18,

     20) connected to said super regenerative detector (12) for outputing a signal of low frequency having a pulse duration equal to the duration of consecutive pulses of the high frequency input signal, and low frequency interpreter circuit (22, 24,

     26) connected between said high frequency interpreter circuit (16, 18,

     20) and said counter circuit (30) for outputing a digital signal of a pulse equal in duration to the low frequency input signal which is proportional to the amount of dimming requested.