CARRIER CURRENT SYSTEM

• US 3,835,389 A
• Filed: 07/11/1973
• Issued: 09/10/1974
• Est. Priority Date: 08/30/1971
• Status: Expired due to Term

• Current Assignee: Ralph K. Helfen
• Original Assignee: Ralph K. Helfen
• Inventors: Helfen, Ralph K.
• Primary Examiner(s): Mayer, Albert J.
• Application Number:
  US05/378,092
• Time in Patent Office: 426 Days
• Field of Search: 325/26,37,63,64,113,394,489,490 330/19,21,31 331/116A,116R 333/72 307/2 340/31A,31R
• US Class Current: 307/3
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines

Abstract

A transmitter and a receiver are both connected to a power source. A piezoelectric resonator means is used in the transmitter to determine the frequency of a transmitted signal and a piezoelectric resonator means is used in the receiver for selective reception of the desired transmitted signal.

Claims

1. Oscillator means comprising a transistor, a transformer having one side connected to the emitter of said transistor, a capacitor acting as a base bypass for said transistor, a capacitor acting as a collector bypass for said transistor, and a piezoelectric resonator connected between said collector and base of said transistor providing an output of a predetermined frequency from said transformer, 2. a filter means coupled to the other side of said transformer permitting said output of a predetermined frequency of oscillation to pass and preventing feedback of said power source, 3. first power supply means connected to and providing power to said oscillator means;

b. receiving means connected to said common power source including;

1. a coupling means permitting said output of a predetermined frequency of oscillation to pass while blocking said power source, 2. tuned amplifier means connected to said coupling means including at least one piezoelectric resonator means connected to a transistor amplifier means and providing an output signal, 3. detecting means connected to said tuned amplifier means providing an output signal of predetermined polarity, and 4. second power supply means connected to said tuned amplifier means, and c. actuator means connected to said oscillator means, actuating said actuator means turning on said oscillator means.

2. In a carrier current means according to claim 1 wherein said first filter means and said coupling means each include a capacitor.

3. first power supply means connected to and providing power to said oscillator means;

b. receiving means connected to said common power source including;

4. In a carrier current system according to claim 1 wherein said second power supply means includes a diode-capacitor series combination.

5. In a carrier current system according to claim 1 wherein both said first and second power supply means includes a diode-capacitor series combination.

6. In a carrier current means according to claim 1 wherein said tuned amplifier means includes two piezoelectric resonator means, one each connected to a side of a transistor amplifier means.

7. In a carrier current means according to claim 6 wherein said transistor amplifier means includes a transistor collector connected to one of said piezoelectric resonator means, emitter to the other of said piezoelectric resonator means, and base to said coupling means.

8. In a carrier current means according to claim 1 wherein said detecting means includes a diode-capacitor parallel combination.

9. In a carrier current means according to claim 1 wherein said actuator means provides a high degree of electrical isolation from said power source.

10. In a carrier current means according to claim 9 wherein said actuator means includes first and second transistors, and cooperating bias resistor sconnected between electrical contacts, one of said transistors connected to collector to said oscillator means, base to collector of the other transistor, and emitter to the emitter of the other transistor.