# US 8,786,995 B2 · Surge current suppressing circuit

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- Number: US 8,786,995 B2
- Document ID: US8786995B2
- Status: Granted
- Kind: B2
- Application number: 13/171,841
- Filed: 2011-06-29
- Published: 2013-01-03
- Granted: 2014-07-22
- Earliest claimed: 2011-06-29
- Assignees: Leader Electronics Corporation
- Applicants: René Frederik Koch; Min-Ta Hsiao; Ming-Cheng Chuang
- Inventors: René Frederik Koch; Min-Ta Hsiao; Ming-Cheng Chuang
- Web page: https://patentgrep.com/patent/US8786995B2

## CPC

- H02H 3/08: responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04)
- H02H 9/02: responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)}
- H02H 9/04: responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T)
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)

## Abstract

A surge current suppressing circuit is applied between an AC power and an electronic device that receives the AC power via a first AC power line and a second AC power line. The surge current suppressing circuit has a first input fuse connected to the first AC power line, and a first air-core inductor connected in series with the first input fuse on the first AC power line to suppress a surge current. Depending upon the practical applications, the surge current suppressing circuit can further have a second air-core inductor connected to the second AC power line, a capacitor connected between the two AC power lines or both.

## Claims

### Claim 1

A surge current suppressing circuit applied between an AC power and an electronic device that receives the AC power via a first AC power line and a second AC power line, the surge current suppressing circuit comprising:
a first input fuse connected to the first AC power line;
a first air-core inductor connected in series with the first input fuse on the first AC power line between the AC power and the electronic device to suppress a surge current flowing to the first AC power line and the second AC power line.

### Claim 2 (depends on 1)

The surge current suppressing circuit as claimed in claim 1, further comprising a second air-core inductor connected to the second AC power line between the AC power and the electronic device.

### Claim 3 (depends on 1)

The surge current suppressing circuit as claimed in claim 1, further comprising a capacitor connected between the first AC power line and the second AC power line.

### Claim 4 (depends on 2)

The surge current suppressing circuit as claimed in claim 2, further comprising a capacitor connected between the first AC power line and the second AC power line.

### Claim 5 (depends on 3)

The surge current suppressing circuit as claimed in claim 3, wherein the capacitor is provided between the first air-core inductor and the electronic device.

### Claim 6 (depends on 4)

The surge current suppressing circuit as claimed in claim 4, wherein the capacitor is provided between the first air-core inductor and the electronic device.