# US 10,312,003 B2 · Circuit board with thermal paths for thermistor

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- Number: US 10,312,003 B2
- Document ID: US10312003B2
- Status: Granted
- Kind: B2
- Application number: 15/388,322
- Filed: 2016-12-22
- Published: 2017-07-20
- Granted: 2019-06-04
- Earliest claimed: 2016-01-19
- Assignees: Semiconductor Components Industries, LLC
- Applicants: Fairchild Korea Semiconductor Ltd.
- Inventors: BongGeun Chung; YoonJoo You
- Web page: https://patentgrep.com/patent/US10312003B2

## CPC

- H01C 7/04: having negative temperature coefficient
- H01C 1/01: Mounting; Supporting
- H01C 1/1413: {Terminals or electrodes formed on resistive elements having negative temperature coefficient}
- H05K 1/0201: {Thermal arrangements, e.g. for cooling, heating or preventing overheating}
- H01R 12/58: terminals for insertion into holes
- H05K 1/181: associated with surface mounted components
- H05K 1/182: associated with components mounted in printed circuit boards [PCB], e.g. insert-mounted components [IMC]
- H05K 3/3447: Lead-in-hole components
- H05K 2201/10022: Non-printed resistor
- H05K 2201/10196: Variable component, e.g. variable resistor
- H01C: RESISTORS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS

## Abstract

A circuit board for an electronic device includes pattern areas on both sides of the circuit board. Each end of a thermistor is electrically connected to electrically conductive pads on pattern areas on the top and bottom sides of the circuit board. An input plug is electrically connected to an end of the thermistor. The input plug is electrically connected to the thermistor by way of an input connector to which the circuit board is inserted.

## Claims

### Claim 1

A circuit board comprising:
a first conductive pad on a top side of the circuit board;
a second conductive pad on a bottom side of the circuit board;
a thermistor mounted on the circuit board, the thermistor comprising a first end that is electrically connected to the first and second conductive pads and a second end that is electrically connected to a component that is mounted on the circuit board,
an input plug:
an input connector electrically coupled to the input plug, and the input connector comprising a first contact and a second contract; and
the first contact coupled directly to the first conductive pad on the top side of the circuit board, and the second contact coupled directly to the second conductive pad on the bottom side of the circuit board.

### Claim 2 (depends on 1)

The circuit board of claim 1, wherein the first and second conductive pads are solder pads and the thermistor is soldered onto the first and second conductive pads.

### Claim 3 (depends on 1)

The circuit board of claim 1, wherein the thermistor is a negative temperature coefficient (NTC) thermistor.

### Claim 4 (depends on 1)

The circuit board of claim 1, wherein the component that is electrically connected to the second end of the thermistor comprises a rectifier.

### Claim 5 (depends on 1)

The circuit board of claim 1, further comprising a third conductive pad on the top side of the circuit board and a fourth conductive pad on the bottom side of the circuit board.

### Claim 6 (depends on 5)

The circuit board of claim 5, wherein the second end of the thermistor is electrically connected to the third and fourth conductive pads.

### Claim 7 (depends on 6)

The circuit board of claim 6, wherein the first, the second, the third, and the fourth conductive pads comprise solder pads, the first end of the thermistor is soldered to the first and second conductive pads, and the second end of the thermistor is soldered to the third and fourth conductive pads.

### Claim 8 (depends on 1)

The circuit board of claim 1, wherein the thermistor is mounted on the top side of the circuit board.

### Claim 9 (depends on 1)

The circuit board of claim 1 further comprising the input plug configured to act as a heat sink for the thermistor.

### Claim 10 (depends on 9)

The circuit board of claim 9 wherein the input plug has a volume 0.22 cm3.

### Claim 11

An electronic device comprising:
a printed circuit board comprising a top side and a bottom side, a first solder pad on the top side, a second solder pad on the bottom side, and a thermistor having a first end that is soldered to the first and second solder pads;
an enclosure that houses the printed circuit board;
an input plug that extends outward away from the enclosure;
an input connector disposed within the enclosure and electrically coupled to the input plug, and the input connector comprising a first contact and a second contact;
the first contacted coupled directly to the first solder pad on the top side of the printed circuit board, and the second contact coupled directly to the second solder pad on the bottom side of the circuit board.

### Claim 12 (depends on 11)

The electronic device of claim 11, wherein the input plug extends out of the enclosure.

### Claim 13 (depends on 11)

The electronic device of claim 11, wherein the thermistor comprises a negative temperature coefficient (NTC) thermistor.

### Claim 14 (depends on 11)

The electronic device of claim 11, wherein the thermistor is mounted on the top side of the printed circuit board.

### Claim 15 (depends on 11)

The electronic device of claim 11, wherein the printed circuit board further comprises a third conductive pad on the top side and a fourth conductive pad on the bottom side, and a second end of the thermistor is soldered to the third and fourth conductive pads.

### Claim 16 (depends on 11)

The electronic device of claim 11 further comprising the input plug configured to act as a heat sink for the thermistor.

### Claim 17

A circuit board comprising:
a first pattern area on a top side of the circuit board;
a second pattern area on a bottom side of the circuit board;
a thermistor comprising a first end that is electrically connected to an electrically conductive portion on the first pattern area and to an electrically conductive portion on the second pattern area, the thermistor further comprising a second end that is electrically connected to an electrically conductive portion on a third pattern area;
an input plug;
an input connector electrically coupled to the input plug, and the input connector comprising a first electrical contact and a second electrical contact; and
the first electrical contact coupled directly to the first pattern area on the top side of the circuit board, and the second electrical contact coupled directly to the second pattern area on the bottom side of the circuit board.

### Claim 18 (depends on 17)

The circuit board of claim 17, wherein the first end of the thermistor is soldered to the electrically conductive portions on the first and second pattern areas.

### Claim 19 (depends on 18)

The circuit board of claim 18, wherein the second end of the thermistor is soldered to the electrically conductive portion on the third pattern area on the top side of the circuit board and to an electrically conductive portion on a fourth pattern area on the bottom side of the circuit board.

### Claim 20 (depends on 17)

The circuit board of claim 17 further comprising the input plug configured to act as a heat sink for the thermistor.