# US 2024/0201232 A1 · Power detection circuit

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- Number: US 2024/0201232 A1
- Document ID: US20240201232A1
- Status: Published application
- Kind: A1
- Application number: 18/587,508
- Filed: 2024-02-26
- Published: 2024-06-20
- Earliest claimed: 2020-07-22
- Assignees: Taiwan Semiconductor Manufacturing Company, Ltd.
- Applicants: Taiwan Semiconductor Manufacturing Company, Ltd.
- Inventors: Chia-Chen Kuo; Chiting Cheng; Wei-jer Hsieh; Yangsyu Lin
- Web page: https://patentgrep.com/patent/US20240201232A1

## CPC

- G01R 19/16519: {using FET's}
- G01R 19/155: Indicating the presence of voltage
- G01R 19/16538: {in AC or DC supplies (G01R19/16519 and G01R19/16528 take precedence)}
- G01R 19/16566: {Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533}
- H02H 1/0007: {concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445)}
- H02H 9/02: responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- 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 power detection circuit is provided. The power detection circuit includes a comparator circuit operative to generate an output signal in response to an input signal. The output signal is configured to change from a first value to a second value in response to the input signal attaining a first threshold value. The output signal is configured to change from the second value to the first value in response to the input signal subsequently attaining a second threshold value. A current limiting circuit is connected to the comparator circuit and operative to limit a leakage current of the comparator circuit.

## Claims

### Claim 1

A power detection circuit comprising:
a comparator circuit to indicate a status of an input power, wherein an output of the comparator circuit is a first logic state when a voltage level of the input power is greater than a first threshold level indicating power is on, and wherein the output of the comparator circuit switches to a second logic state when the voltage level of the input power is subsequently lower than a second threshold level indicating the power is off;
a current limiting circuit connected to the comparator circuit, wherein the current limiting circuit is operative to limit a leakage current of the comparator circuit; and
a feedback circuit connected to the comparator circuit, wherein the feedback circuit is operative to control the first threshold level and the second threshold level.

### Claim 2

A device comprising a power detection circuit, wherein the power detection circuit comprises:
a comparator circuit operative to determine a status of an input power, wherein the comparator circuit being operative to determine the status of an input power comprises the comparator circuit being operative to:
determine power to be on when a voltage level of the input power is greater than a first threshold level, and
determining the power to be off when the voltage level of the input power is subsequently lower than a second threshold level;
a current limiting circuit connected to the comparator circuit and operative to limit a leakage current of the comparator circuit; and
a feedback circuit connected to the comparator circuit and operative to control the first predetermined threshold and the second predetermined threshold, wherein the current limiting circuit is connected in parallel to the feedback circuit.

### Claim 3

A method of detecting power in a circuit, the method comprising:
receiving an input power at a comparator circuit;
determining a status of the input power, by the comparator circuit, wherein determining the status of the input power comprises:
determining power to be on when a voltage level of the input power is greater than a first threshold level, and
determining the power off when the voltage level of the input power is subsequently lower than a second threshold level;
controlling the first threshold value and the second threshold value through a feedback circuit connected to the comparator circuit; and
limiting a leakage current of the comparator circuit through a current limiting circuit connected in parallel to the feedback circuit.