# US 2013/0154665 A1 · Power detection circuit

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- Number: US 2013/0154665 A1
- Document ID: US20130154665A1
- Status: Published application
- Kind: A1
- Application number: 13/612,516
- Filed: 2012-09-12
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Kazuhiro UEDA
- Web page: https://patentgrep.com/patent/US20130154665A1

## CPC

- G01R 21/00: Arrangements for measuring electric power or power factor (G01R7/12 takes precedence)
- G01R 21/01: in circuits having distributed constants (G01R21/04, G01R21/07, G01R21/09, G01R21/12 take precedence)
- G01R 21/12: in circuits having distributed constants
- H03D 1/10: of diodes
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H03D: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66)

## Abstract

There is provided a power detection circuit capable of appropriately adjusting detection voltage characteristics by using simple configuration. The power detection circuit includes a first resistor having current applied thereto to adjust a detection voltage value of input power, an element having an applied voltage and a load characteristic changed according to the input power, and a second resistor connected to the element and having current applied thereto when resistance of the element becomes relatively low, to adjust the detection voltage value of the input power. Detection voltage characteristics may be appropriately adjusted using a simple configuration.

## Claims

### Claim 1

A power detection circuit comprising:
a first resistor having current applied thereto to adjust a detection voltage value of input power;
an element having an applied voltage and a load characteristic, changed according to the input power; and
a second resistor connected to the element and having current applied thereto when resistance of the element becomes relativley low to adjust the detection voltage value of the input power.

### Claim 2 (depends on 1)

The power detection circuit of claim 1, wherein the element is formed of a diode.

### Claim 3 (depends on 1)

The power detection circuit of claim 1, wherein the element has the load characteristic changed according to feedback of the detection voltage value.