Digital touch controlled dimmer switch

• US 4,246,494 A
• Filed: 12/12/1978
• Issued: 01/20/1981
• Est. Priority Date: 12/12/1978
• Status: Expired due to Term

• Current Assignee: National Electric Corporation
• Original Assignee: National Electric Corporation
• Inventors: Hightower, William S., Foreman, Luther M.
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Dwyer, James L.
• Application Number:
  US05/968,862
• Time in Patent Office: 770 Days
• Field of Search: 307/116, 307/150, 307/157, 361/181, 200/DIG. 1, 200/5, 340/365 R, 340/365 S, 340/365 G, 315/194, 315/291
• US Class Current: 307/116
• CPC Class Codes: H01H 2231/052 Selectors, e.g. dimmers
• CPC Class Codes: H01H 2239/064 Simulating the appearance of touch panel
• CPC Class Codes: H03K 17/725 for ac voltages or currents H03K17/722, H03K17/735 take precedence
• CPC Class Codes: H03K 2217/96015 Constructional details for touch switches for capacitive touch switches see H03K2217/9607
• CPC Class Codes: H05B 39/085 by touch control

Abstract

A touch controlled dimmer switch is provided so that a user may indicate the level to which the illumination output of a light or lamp is to be maintained by touching a control keyboard. Digital control circuitry responds to touching of the keyboard by the user to adjust the amount of electrical power furnished to the lamp and regulate the illumination output.

Claims

1. A touch controlled dimmer switch apparatus for controlling the illumination output of a light source or lamp comprising:

(a) a touch pad for receiving contact from a user'"'"'s touch;

(b) a plurality of conductive strip members disposed behind said touch pad for responding to the user'"'"'s touch and indicating a desired illumination output;

(c) microprocessor circuit means comprising;

(1) multiplexer means for scanning sequentially said plurality of conductive strip members in a time division multiplex fashion;

(2) means to detect which, if any, of said conductive strips has been contacted from a user'"'"'s touch through said touch pad; and

(3) means to provide an output signal that controls the illumination output intensity responsive to which of said conductive strips has been contacted; and

(d) control circuit means responsive to an indication from said conductive strip means to control the amount of electrical power to the light and thereby the illumination output of the light.

2. The apparatus of claim 1, wherein said conductive strips are divided into a plurality of contact regions.

3. The apparatus of claim 2, wherein said conductive strip means comprises:

(a) a plurality of contact region conductive strips for sensing contact with a corresponding one of said plurality of contact regions; and

(b) a plurality of incrementing conductive strips within each of said plurality of contact regions for designated selected increments of illumination output of the lamp.

4. The apparatus of claim 3, wherein said plurality of contact region conductive strips and said plurality of incrementing conductive strips are arranged in a matrix.

5. The apparatus of claim 1, further including:

switch means for automatically incrementing the illumination output of the lamp up or down at a user'"'"'s discretion.

6. The apparatus of claim 1, wherein the lamp is operated by alternating current and further including:

power supply means for providing direct current power for the apparatus from the alternating current supplied to the lamp.

7. A power supply for providing direct current power for a touch controlled dimmer switch, which operates in response to a touch control switch responsive to a user'"'"'s touch indicating a desired illumination output to a microprocessor, for controlling the illumination output of an alternating current light or lamp, comprising:

(a) means responsive to zero crossing in the alternating current for forming a square wave;

(b) switch means for forming charging pulses in response to said means for forming a square wave; and

(c) capacitor means for receiving pulses from said switch means and storing electrical energy as direct current power for operating the microprocessor to control the lamp output.