# US 9,521,485 B2 · Voltage supply circuit included in terminal equipment

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- Number: US 9,521,485 B2
- Document ID: US9521485B2
- Status: Granted
- Kind: B2
- Application number: 14/734,584
- Filed: 2015-06-09
- Published: 2016-06-16
- Granted: 2016-12-13
- Earliest claimed: 2014-12-10
- Assignees: Wisol Co., Ltd.
- Applicants: Wisol Co., Ltd.
- Inventors: Ahn Kook Lee
- Web page: https://patentgrep.com/patent/US9521485B2

## CPC

- H04R 3/002: {Damping circuit arrangements for transducers, e.g. motional feedback circuits}
- H01R 13/7031: {Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity}
- H03G 3/348: {Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits}
- H04R 1/1041: {Mechanical or electronic switches, or control elements (switches in general H01H)}
- G10K 2210/1081: Earphones, e.g. for telephones, ear protectors or headsets
- H01R 24/58: Contacts spaced along longitudinal axis of engagement
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H03G: CONTROL OF AMPLIFICATION
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

A voltage supply circuit included in an audio signal processing device includes a control unit for controlling a signal output from a terminal equipment; a power supply unit for outputting voltage to an earphone device according to a control signal of the control unit; and a variable circuit unit connected to the power supply unit to convert the voltage output from the power supply unit and transmit the converted voltage to the earphone device.

## Claims

### Claim 1

A voltage supply circuit included in a terminal equipment, the voltage supply circuit comprising:
a control unit for controlling a signal output from the terminal equipment;
a power supply unit for outputting voltage to an earphone device according to a control signal of the control unit; and
a variable circuit unit connected to the power supply unit to convert the voltage output from the power supply unit and transmit the converted voltage to the earphone device,
wherein the variable circuit unit comprises:
a first resistor connected to the power supply unit to adjust magnitude of the voltage output from the power supply unit;
a second resistor connected to the power supply unit to adjust the magnitude of the voltage output from the power supply unit;
a third resistor for adjusting the magnitude of the voltage output from the power supply unit according to switching of a first switch;
a first capacitor for adjusting any one of a speed of increasing and a speed of decreasing the magnitude of the voltage output from the power supply unit;
a second capacitor for maintaining the voltage output from the power supply unit to a predetermined value; and
the first switch arranged between the power supply unit and the second capacitor and switched according to a control of the control unit.

### Claim 2 (depends on 1)

The voltage supply circuit according to claim 1, wherein if the voltage supply circuit enters a communication mode, the control unit turns on the first switch.

### Claim 3 (depends on 2)

The voltage supply circuit according to claim 2, wherein when the first switch is turned on, the magnitude of the voltage output from the power supply unit is determined by a first resistance value, a second resistance value and a third resistance value.

### Claim 4 (depends on 1)

The voltage supply circuit according to claim 1, wherein when a communication mode is released, the control unit turns off the first switch.

### Claim 5 (depends on 4)

The voltage supply circuit according to claim 4, wherein when the first switch is turned off, the magnitude of the voltage output from the power supply unit is determined by a first resistance value and a second resistance value.

### Claim 6

A terminal equipment supporting an audio device, the terminal equipment comprising:
an interface unit for connecting a four-pole earphone device;
an audio processing unit for providing an audio signal to the four-pole earphone device through the interface unit;
a control unit for controlling a signal output from the terminal equipment to the earphone device;
a power supply unit for outputting voltage to the earphone device according to a control signal of the control unit; and
a variable circuit unit connected to the power supply unit to convert the voltage output from the power supply unit and transmit the converted voltage to the earphone device,
wherein the variable circuit unit includes:
a first resistor connected to the power supply unit to adjust magnitude of the voltage output from the power supply unit;
a second resistor connected to the power supply unit to adjust the magnitude of the voltage output from the power supply unit;
a third resistor for adjusting the magnitude of the voltage output from the power supply unit according to switching of a first switch;
a first capacitor for adjusting any one of a speed of increasing and a speed of decreasing the magnitude of the voltage output from the power supply unit;
a second capacitor for maintaining the voltage output from the power supply unit to a predetermined value; and
the first switch arranged between the power supply unit and the second capacitor and switched according to a control of the control unit.

### Claim 7 (depends on 6)

The terminal equipment according to claim 6, wherein if the terminal equipment enters a communication mode, the control unit turns on the first switch.

### Claim 8 (depends on 7)

The terminal equipment according to claim 7, wherein when the first switch is turned on, the control unit determines the magnitude of the voltage output from the power supply unit based on a first resistance value, a second resistance value and a third resistance value.

### Claim 9 (depends on 6)

The terminal equipment according to claim 6, wherein when a communication mode is released, the control unit turns off the first switch.

### Claim 10 (depends on 9)

The terminal equipment according to claim 9, wherein when the first switch is turned off, the magnitude of the voltage output from the power supply unit is determined by a first resistance value and a second resistance value.