Dying Gasp Circuit Using Segmented Power and Unipolar Switch

Solution Overview

Problem

High-capacitance capacitors used in ADSL CPEs for generating dying gasp signals increase costs, occupy space, and lead to burst currents and reduced power-down detection sensitivity, delaying signal generation.

Innovation Solution

A circuit comprising a power loss detecting circuit, a Digital Signal Processor (DSP), and a unipolar switch mechanism with a capacitor, where the unipolar switch mechanism shuts down to allow the capacitor to power the DSP for timely dying gasp signal generation when power is lost.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If capacitors with high capacitance are used to supply power for generating dying gasp signals, then the ADSL CPE can generate dying gasp signals for sufficient time, but the cost of the ADSL CPE increases

Engineering Contradiction:

Improvetime to generate dying gasp signalsVSAvoidcost of ADSL CPE

Core Design Contradiction:

Duration of action of moving objectVSEase of manufacture

Solution Approach 1:

The power supply function is segmented into two parts: the main power supply and a small capacitor for dying gasp signal generation. The unipolar switch isolates the capacitor from the main power supply, allowing the capacitor to independently power the DSP during power loss without requiring high capacitance values, thus reducing cost while maintaining sufficient operation time.

Inventive Principle:

Principle #1Segmentation

2Duration of action of moving object

If capacitors with high capacitance are used to supply power for generating dying gasp signals, then the ADSL CPE can generate dying gasp signals for sufficient time, but the capacitors take up more space on the printed circuit board

Engineering Contradiction:

Improvetime to generate dying gasp signalsVSAvoidspace on printed circuit board

Core Design Contradiction:

Duration of action of moving objectVSArea of stationary object

Solution Approach 1:

The power supply function is segmented into the main power supply and a small capacitor for dying gasp signal generation. The unipolar switch isolates the capacitor from the main power supply, allowing the capacitor to independently power the DSP during power loss without requiring high capacitance values, thus reducing cost while maintaining sufficient operation time.

Inventive Principle:

Principle #1Segmentation

3Duration of action of moving object

If capacitors with high capacitance are used to supply power for generating dying gasp signals, then the ADSL CPE can generate dying gasp signals for sufficient time, but the increased capacitance increases burst currents and makes the ADSL CPE liable to break down

Engineering Contradiction:

Improvetime to generate dying gasp signalsVSAvoidbreakdown resistance of ADSL CPE

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The power supply function is segmented into the main power supply and a small capacitor for dying gasp signal generation. The unipolar switch isolates the capacitor from the main power supply, allowing the capacitor to independently power the DSP during power loss without requiring high capacitance values, thus reducing cost while maintaining sufficient operation time.

Inventive Principle:

Principle #1Segmentation

4Duration of action of moving object

If capacitors with high capacitance are used to supply power for generating dying gasp signals, then the ADSL CPE can generate dying gasp signals for sufficient time, but the increased capacitance reduces sensibility of power-down detection

Engineering Contradiction:

Improvetime to generate dying gasp signalsVSAvoidsensibility of power-down detection

Core Design Contradiction:

Duration of action of moving objectVSMeasurement precision

Solution Approach 1:

The power supply function is segmented into the main power supply and a small capacitor for dying gasp signal generation. The unipolar switch isolates the capacitor from the main power supply, allowing the capacitor to independently power the DSP during power loss without requiring high capacitance values, thus reducing cost while maintaining sufficient operation time.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables timely generation of dying gasp signals without the need for high-capacitance capacitors, reducing costs and space requirements while maintaining reliable power-down detection.

Implementation Method 1

Capacitors with high capacitance are needed in order to supply sufficient power

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

The unipolar switch mechanism includes a second input end connected to the first input end of the power loss detecting circuit

Methodology Applied

Scientific EffectElectrical Conductivity: Conduction (electrical)

Data Source

PatentUS7573941B2Circuit for generating dying gasp signals and electronic device utilizing the same

Publication Date: 2009.08.11 CLOUD NETWORK TECH SINGAPORE PTE LTD

AI summary

An exemplary circuit for generating dying gasp signals (30) includes a power loss detecting circuit (320), a Digital Signal Processor (DSP) (310), a unipolar switch circuit (330), and a capacitor (C1). The power loss detecting circuit is used for detecting power loss statuses and generating interrupt signals, and includes a first input end. The DSP is connected to the power loss detecting circuit, and is used for generating dying gasp signals according to the interrupt signals. The unipolar switch circuit includes a second input end connected to the first input of the power loss detecting circuit, and a first output end connected to the DSP. The capacitor includes one end connected to the first output end of the unipolar switch circuit, and another end connected to ground.