Dynamic Reference Voltage for Power Overload Detection

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Solution Overview

Problem

Existing power supply systems struggle to accurately detect power overload and skip cycle conditions due to variations in bulk input voltage, leading to inefficient power dissipation and inadequate power supply to loads.

Innovation Solution

A power supply control system that uses the bulk voltage to generate dynamic reference signals for power overload and skip mode detection, ensuring accurate power monitoring and efficient operation by adjusting power dissipation based on input voltage changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed reference voltage is used for power overload detection, then the detection method is simple, but the detection accuracy deteriorates when bulk input voltage changes

Engineering Contradiction:

Improvedetection circuit complexityVSAvoidpower overload detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The reference voltage is changed from a fixed value to a dynamic value that varies with bulk input voltage. The circuit dynamically adjusts the reference voltage level based on the actual input voltage condition, allowing accurate power overload detection across different input voltage ranges while maintaining reasonable circuit complexity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The reference voltage parameter is changed from a constant fixed value to a variable that changes with bulk input voltage. This parameter change enables the detection threshold to adapt to different operating conditions, resolving the contradiction between simplicity and accuracy.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a fixed reference voltage is used for skip cycle detection, then the detection circuit is simple, but the power supply enters skip mode prematurely when bulk input voltage changes

Engineering Contradiction:

Improvedetection circuit complexityVSAvoidpower supply reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The reference voltage for skip cycle detection is made dynamic, adjusting automatically with bulk input voltage changes. This prevents premature entry into skip mode by ensuring the detection threshold reflects actual operating conditions, thereby improving power supply reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The reference voltage parameter is dynamically adjusted based on bulk input voltage, changing the detection threshold to match actual power delivery conditions. This resolves the contradiction between circuit simplicity and reliable operation.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the power supply system does not account for bulk input voltage changes, then the control system is simple, but power dissipation increases and efficiency deteriorates

Engineering Contradiction:

Improvecontrol system complexityVSAvoidpower dissipation

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The control system incorporates feedback from bulk input voltage monitoring to dynamically adjust the reference voltage for power detection. This feedback mechanism enables the system to optimize power dissipation by adapting to input voltage changes without requiring complex additional control circuitry.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS7679874B2Power overload detection method and structure therefor

Publication Date: 2010.03.16 SEMICON COMPONENTS IND LLC

AI summary

In one embodiment, the bulk input voltage is used to form a reference signal that is used for controlling a switching power supply system to operate in a power overload operating mode.