Varistor with three parallel ceramic layer

• US 20070103268A1
• Filed: 05/08/2006
• Published: 05/10/2007
• Est. Priority Date: 11/08/2005
• Status: Active Grant

• Current Assignee: Powertech Industrial Company Limited
• Original Assignee: Energetics Technologies, LLC
• Inventors: Luo, Rih-Lang
• Granted Patent: US 7,623,019 B2
• Time in Patent Office: Days
• US Class Current: 338/21
• CPC Class Codes: H01C 13/02 Structural combinations of resistors impedance networks per se H03H
• CPC Class Codes: H01C 7/12 Overvoltage protection resistors series resistors structurally associated with spark gaps H01T1/16

Abstract

The present invention discloses a varistor which comprises three parallel ceramic layers. Each of the ceramic layers has two electrodes on both sides thereof. Four leads are properly arranged between and outside surfaces of the ceramic layers to contact with these electrodes. By further providing one or two wires to connect these leads, the three- or single-phase power sources can be protected in a safer manner.

Claims

1. A varistor, comprising three ceramic layers, six electrodes and a plurality of leads, wherein:

the three ceramic layers are arranged in parallel and defined as a 1st varistor, a 2nd varistor and a 3rd varistor in order;

the six electrodes are defined as a 1st electrode and a 2nd electrode respectively disposed on both sides of the 1st varistor;

a 3rd electrode and a 4th electrode respectively disposed on both sides of the 2nd varistor; and

a 5th electrode and a 6th electrode respectively disposed on both sides of the 3rd varistor; and

the plurality of leads are properly connected to the electrodes to form a three- or single-phase varistor.

2. The varistor as claimed in claim 1, wherein the ceramic layers are made of metal oxide powder.

3. The varistor as claimed in claim 1, wherein the plurality leads are defined as a 1st lead with one end connected to the 1st electrode, a 2nd lead with one end connected to the 2nd electrode and the 3rd electrode, a 3rd lead with one end connected to the 4th electrode and the 5th electrode, and a 4th lead with one end connected to the 6th electrode.

4. The varistor as claimed in claim 3, further comprising a wire for conducting the 1 st lead and the 4th lead, so that when a surge energy is conducted to the 1st varistor via the 1st lead and the 2nd lead, the 1st varistor will absorb the surge by transforming the electrical energy into heat.

5. The varistor as claimed in claim 3, further comprising a wire for conducting the 1st lead and the 4th lead, so that when a surge of electrical energy is conducted to the 2nd varistor via the 2nd lead and the 3rd lead, the 2nd varistor will absorb the surge by transforming the electrical energy into heat.

6. The varistor as claimed in claim 3, further comprising a wire for conducting the 1st lead and the 4th lead, so that when a surge of electrical energy is conducted to the 3rd varistor via the 3rd lead and the 4th lead, the 3rd varistor will absorb the surge by transforming the electrical energy into heat.

7. The varistor as claimed in claim 3, further comprising a wire for conducting the 1st lead and the 3rd lead, and a wire for conducting the 2nd lead and the 4th lead;

so that the three ceramic layers will be effective as a whole.

8. The varistor as claimed in claim 1, wherein the plurality of leads are defined as a 1st lead with two ends respectively connected to the 1st and the 6th electrodes, a 2nd lead with one end connected to the 2nd electrode and the 3rd electrode, and a 3rd lead with one end connected to the 4th electrode and the 5th electrode.

9. The varistor as claimed in claim 1, wherein the plurality of leads are defined as a 1st lead with one end connected to the 1st electrode and another end connected to the 4th and the 5th electrode, and a 2nd lead with one end connected to the 6th electrode and another end connected to the 2nd and the 3rd electrode.