Wiegand effect energy generator

• US 6,191,687 B1
• Filed: 09/24/1998
• Issued: 02/20/2001
• Est. Priority Date: 09/24/1998
• Status: Expired due to Term

• Current Assignee: Neptune Technology Group Incorporated (Roper Technologies, Inc.)
• Original Assignee: HID Corporation (Assa Abloy AB)
• Inventors: Dlugos, David J., Siefer, David A., Small, Don
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/159,439
• Time in Patent Office: 880 Days
• Field of Search: 340/500, 340/551, 340/552, 340/567, 340/506, 307/419
• US Class Current: 340/506
• CPC Class Codes: G01F 15/065 with transmission devices, e.g. mechanical
• CPC Class Codes: G01P 3/487 delivered by rotating magnets
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: H02N 11/002 Generators

Abstract

A Wiegand sensor is provided as a power source for an external circuit, wherein an alternating magnetic field changes the magnetic state of a Wiegand wire within the Wiegand sensor which, in turn, produces a substantial output pulse that is provided as a power source for the external circuit. The external circuit may be a transmitter that is powered by the output of the Wiegand sensor and upon being powered transmits an information signal to an appropriate receiver. The number of occurrences that the magnetic field alternates corresponds to and is ascertained from the number of information signals that are transmitted. The alternating magnetic field may be generated by magnets coupled to a rotating valve of a gas or water meter such that the occurrence of each transmission of the information signal represents the flow of a predetermined amount of gas or water through the meter. The use of a transmitter that is powered solely by a Wiegand sensor that senses the rotation of a meter allows for that meter to be placed in a generally inaccessible area wherein an appropriate receiver may be utilized to receive each transmitted information signal and to maintain the number of occurrences the transmitted information signal is received. The external circuit may be any number of other types of circuits including a transmitter that transmits an alarm signal to a receiver coupled to an alarm system, or a counter circuit that increments a count value stored therein each time the counter circuit is powered by the Wiegand sensor.

Claims

1. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field;

a Wiegand sensor responsive to said alternating magnetic field and for producing an output in response thereto; and

an electrical circuit coupled to said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, said electrical circuit being a transmitter for transmitting an information signal upon being powered by said power source.

2. The combination of claim 1, wherein said Wiegand sensor includes a Wiegand wire, said Wiegand wire changing a magnetic state thereof in response to said alternating magnetic field.

3. The combination of claim 1, wherein said transmitter is a radio frequency transmitter for transmitting a radio signal upon being powered by said power source.

4. The combination of claim 3, further comprising a radio frequency receiver for receiving the radio signal transmitted by said radio frequency transmitter.

5. The combination of claim 4, wherein said transmitted radio signal represents the occurrence of the generation of the alternating magnetic field by said field generating means;

and said receiver includes means for counting the occurrences of the generation of the alternating magnetic fields.

6. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field;

a Wiegand sensor having a Wiegand wire responsive to said alternating magnetic field and a pickup coil wound around said Wiegand wire for producing an output in response to said alternating magnetic field; and

an electrical circuit coupled to the pickup coil of said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, the power source output from said Wiegand sensor being the only power source of said electrical circuit.

7. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field;

a Wiegand sensor responsive to said alternating magnetic field and for producing an output in response thereto, said Wiegand sensor producing an output pulse each time the magnetic field generated by said field generating means alternates; and

an electrical circuit coupled to said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, said electrical circuit being a transmitter for transmitting an information signal upon being powered by each output pulse of said Wiegand sensor.

8. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field, said field generating means being comprised of at least one magnet coupled to a valve of a meter, said valve rotating upon the occurrence of a predetermined event;

a Wiegand sensor responsive to said alternating magnetic field and for producing an output in response thereto; and

an electrical circuit coupled to said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, said electrical circuit being a transmitter for transmitting an information signal upon being powered by said power source, each transmission of the information signal representing the occurrence of a rotation of the valve of the meter.

9. The combination of claim 8, wherein the predetermined event is the flow of a gas or liquid through the meter and the transmission of each respective information signal represents the flow of a predetermined amount of gas or liquid through the meter.

10. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field;

a Wiegand sensor responsive to said alternating magnetic field and for producing an output in response thereto;

an electrical circuit coupled to said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, the electrical circuit being a transmitter for transmitting an alarm signal upon being powered by said power source; and

a receiver operable to be coupled to an alarm system, said receiver being operable to receive the transmitted alarm signal and to supply the alarm signal to said alarm system.

11. A Wiegand effect energy generator in combination with an electrical circuit, the combination comprising:

field generating means for generating an alternating magnetic field;

a Wiegand sensor responsive to said alternating magnetic field and for producing an output in response thereto; and

an electrical circuit coupled to said Wiegand sensor for receiving said output as a power source, said electrical circuit performing a function upon being powered by said power source, the electrical circuit being a counter circuit, said counter circuit being operable to store a count value therein and to increase the count value upon being powered by the power source output by said Wiegand sensor.

12. A method of powering a circuit, comprising the steps of:

generating an alternating magnetic field;

responding to the alternating magnetic field;

producing a power output signal solely from the response to the alternating magnetic field;

powering a circuit from the power output signal produced from the response to the alternating magnetic field, the circuit being a transmitter; and

transmitting by the transmitter of an information signal upon being powered by the power output source.

13. The method of claim 12, wherein the steps of responding to the alternating magnetic field and producing a power output signal are carried out by a Wiegand sensor having a Wiegand wire therein, wherein the step of responding is carried out by the Wiegand wire by changing a magnetic state thereof in response to the alternating magnetic field.

14. The method of claim 12, wherein the transmitting step is carried out by transmitting a radio signal upon being powered by the power output source.

15. The method of claim 14, further comprising the steps of receiving the radio signal and counting each occurrence of reception of the radio signal.

16. A method of powering a circuit, comprising the steps of:

generating an alternating magnetic field;

responding to the alternating magnetic field each time the generated magnetic field alternates;

producing a power output signal solely from the response to the alternating magnetic field; and

powering a transmitter circuit from each power output signal produced from the response to the alternating magnetic field; and

transmitting by the transmitter of an information signal each time the transmitter is powered by the power output signal.

17. The method of claim 16, wherein the step of generating an alternating magnetic field is carried out by at least one magnet coupled to a rotatable valve of a meter, said valve rotating upon the occurrence of a predetermined event;

and each transmission of the information signal represents the occurrence of a rotation of the valve of the meter.

18. The method of claim 17, wherein the predetermined event is the flow of a gas or liquid through the meter and the transmission of each respective information signal represents the flow of a predetermined amount of gas or liquid through the meter.

19. The method of claim 18, further comprising the steps of placing the meter in a substantially inaccessible location within a facility, providing at an accessible location a receiver operable to receive each transmitted information signal, and maintaining the number of occurrences the transmitted information signal is received.

20. A method of powering a circuit, comprising the steps of:

generating an alternating magnetic field;

responding to the alternating magnetic field;

producing a power output signal solely from the response to the alternating magnetic field;

powering a circuit from the power output signal produced from the response to the alternating magnetic field, the circuit being a transmitter;

transmitting by said transmitter of an alarm signal upon being powered by said power source;

remotely receiving the transmitted alarm signal; and

supplying the received alarm signal to an alarm system.

21. A method of powering a circuit, comprising the steps of:

generating an alternating magnetic field;

responding to the alternating magnetic field;

producing a power output signal solely from the response to the alternating magnetic field;

powering a circuit from the power output signal produced from the response to the alternating magnetic field, the circuit being a counter circuit;

storing within the counter circuit a count value; and

increasing the count value stored in the counter circuit upon being powered by the power output source.