# US 6,724,250 B2 · Transformer of power-amplifier module for an audio device

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- Number: US 6,724,250 B2
- Document ID: US6724250B2
- Status: Granted
- Kind: B2
- Application number: 10/166,672
- Filed: 2002-06-12
- Published: 2003-12-18
- Granted: 2004-04-20
- Earliest claimed: 2002-06-12
- Inventors: Pao-An Chuang
- Web page: https://patentgrep.com/patent/US6724250B2

## CPC

- H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)}
- H03F 3/45475: {using IC blocks as the active amplifying circuit}
- H03F 2200/541: Transformer coupled at the output of an amplifier
- H03F 2203/45652: the LC comprising one or more further dif amp stages, either identical to the dif amp or not, in cascade
- H03F: AMPLIFIERS

## Abstract

A transformer of power-amplifier module for an audio device includes a casing having a first plug and a second plug formed thereon. In the casing, there is an amplifying circuit having an input electrically connected to the first plug and an output electrically connected to the second plug of the casing. The amplifying circuit terminates in a transformer at the output. Furthermore, the transformer is adjustable so as to control the amplitude of output voltage of the transformer of power-amplifier module.

## Claims

### Claim 1

A transformer of power-amplifier module for an audio device, comprising:
a casing having a first plug and a second plug formed thereon; and
an amplifying circuit regulated by a magnetic coupling and received in said casing, said amplifying circuit having an input electrically connected to said first plug and an output electrically connected to said second plug of said casing so as to control the amplitude of output voltage of said transformer of power-amplifier module, wherein said casing is configured as a box with two mounting tabs on opposite sides and having one opening and one coordinated bottom lid, and wherein said bottom lid has a first slot and a second slot relative to the first and second plugs, said slots have a plurality of pins, and said magnetic coupling in said case comprises a plurality of individual coil modules co-located with same amplifying ratio in voltage and different amplifying ratio in current.

### Claim 2 (depends on 1)

The transformer of power-amplifier module for an audio device of claim 1, wherein said individual coil modules have at least three standards, for example, the amplifying ratio co-located from modules with current amplifying ratio 1:2:3 can be 1, 2, 3, 6, or 9 times.

### Claim 3 (depends on 1)

The transformer of power-amplifier module for an audio device of claim 1, further comprising a pad the same size as the bottom lid and having twin adhesive tape on a back, the pad includes a pair of apertures from which said plugs of the magnetic couplings protrude.

### Claim 4 (depends on 1)

The transformer of power-amplifier module for an audio device of claim 1, further comprising two coils and a regulator, the regulator is installed in a space between the coils and extends out of said casing for easy adjustment so as to change the magnetic reluctance.

### Claim 5 (depends on 1)

The transformer of power-amplifier module for an audio device of claim 1, further comprising two coils, each of said two coils is provided with a plurality of pins and a magnetic reluctance of said two coils is adjusted by setting a jumper.

### Claim 6 (depends on 1)

The transformer of power-amplifier module for an audio device of claim 1 wherein said amplifier has a circuit board with a plurality of stages of connectable sockets.