# US 4,114,185 A · Electric fence controllers

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- Number: US 4,114,185 A
- Document ID: US4114185A
- Status: Granted
- Kind: A
- Application number: 05/757,288
- Filed: 1977-01-06
- Granted: 1978-09-12
- Earliest claimed: 1975-04-14
- Assignees: Gallagher Electronics Limited
- Inventors: William Murray Gallagher
- Web page: https://patentgrep.com/patent/US4114185A

## CPC

- H05C 1/04: providing pulse voltages (mechanical self-interrupters H01H; electronic pulse-generators H03K)
- H05C: ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, OR GUIDING LIVING BEINGS (stationary means for catching or killing insects by electric means A01M1/22; apparatus for the destruction of noxious animals, other than insects, by electricity A01M19/00; electric traps for animals A01M23/38; scaring devices for animals A01M29/00; slaughtering or stunning by electric current A22B3/06)

## Abstract

An electric fence controller having a capacitor which can be charged to a predetermined voltage. A timer which discharges the capacitor at fixed intervals of time and a transformer, the primary of which is connected across the capacitor and the secondary of which is connected to a load and to an impedance connected to the primary or secondary of the transformer. The impedance when measured at the operating voltage from the secondary terminals of the transformer is less than the normal fence line impedance.

## Claims

### Claim 1

A device connected to a voltage source and an electric fence having a normal fence line impedance for controlling said electric fence, said device comprising:
a capacitance connected to and adapted to be charged by said voltage source to a substantially predetermined voltage;
timing means operatively connected to said capacitance for discharging said capacitance at fixed time intervals;
a transformer, the primary thereof connected across said capacitance and said timing means and the secondary thereof connected to the fence and to a ground; and
an impedance connected to said transformer, said impedance measured at the operating voltage for the secondary terminals of said transformer being less than the fence line impedance, and said impedance being comprised of a plurality of resistors connected in series parallel arrangement in such a manner that failure of less than three resistors will not materially alter the overall resistance of said resistors

### Claim 2

A device connected to a voltage source and an electric fence having a normal fence line impedance for controlling said electric fence, said device comprising:
a capacitance connected to and adapted to be charged by said voltage source to a substantially predetermined voltage;
timing means operatively connected to said capacitance for discharging said capacitance at fixed time intervals;
a transformer, the primary thereof connected across said capacitance and said timing means and the secondary thereof connected to the fence and to a ground; and
an impedance connected to said transformer, said impedance measured at the operating voltage for the secondary terminals of said transformer being less than the fence line impedance, and said impedance being comprised of seven parallel groups of four resistances in series having equipotential junctions between said resistors connected together.