Power Converter Overtemperature Compensation Across Input Voltages

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Solution Overview

Problem

Power converters face challenges in activating the over temperature protection mechanism consistently across varying input voltages and output currents, leading to potential damage due to delayed activation or incorrect trigger points, especially when input voltage is high or output current is overloaded.

Innovation Solution

A power converter with over temperature protection compensation, comprising a main conversion unit, primary-side control unit, primary detection circuit, and over temperature adjustment circuit, dynamically adjusts the over temperature protection point based on input voltage and output current by obtaining voltage and current change values to generate a temperature control voltage, ensuring timely activation of the protection mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the over temperature protection trigger point is set for low input voltage conditions, then the protection activates timely when input voltage is low, but the trigger point has large error when input voltage is high making the protection meaningless

Engineering Contradiction:

Improveover temperature protection activation accuracyVSAvoidprotection trigger point adaptability to different input voltages

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic adjustment of the over temperature protection trigger point based on input voltage conditions. The controller dynamically changes the trigger temperature threshold according to whether the input voltage is in a first range (lower voltage) or second range (higher voltage), making the protection mechanism adaptive to different operating conditions rather than using a fixed trigger point

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the temperature parameter threshold based on input voltage conditions. When input voltage is in the first range, the trigger point is set to a first temperature value; when input voltage is in the second range, the trigger point is set to a second temperature value. This parameter change ensures accurate protection activation across different voltage conditions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the over temperature protection trigger point is set for high input voltage conditions, then the protection activates appropriately when input voltage is high, but the protection delays activation when input voltage is low increasing damage risk

Engineering Contradiction:

Improveover temperature protection activation accuracyVSAvoidprotection activation delay time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The controller dynamically adjusts the trigger temperature threshold based on real-time input voltage detection. When input voltage is low (first range), the trigger point is dynamically set to a lower first temperature value for timely activation. When input voltage is high (second range), the trigger point is dynamically set to a higher second temperature value appropriate for high voltage conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by setting different temperature thresholds based on input voltage ranges. The first temperature value is lower than the second temperature value, ensuring that the protection activates at appropriate temperatures for each voltage condition, preventing both premature and delayed activation

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If a fixed over temperature protection trigger point is used, then the protection mechanism is simple to implement, but the actual trigger point varies with different input voltages and output currents causing protection failure

Engineering Contradiction:

Improveprotection mechanism complexityVSAvoidprotection activation consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements a dynamic protection mechanism where the trigger temperature threshold is not fixed but dynamically adjusted based on operating conditions. The controller detects input voltage and output current conditions and dynamically changes the trigger point between first and second temperature values, ensuring consistent and reliable protection activation across all operating conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the temperature parameter based on voltage and current conditions. When input voltage is in the first range and output current is in the first range, the trigger point is set to the first temperature value. When input voltage is in the second range or output current is in the second range, the trigger point is set to the second temperature value, ensuring reliable protection regardless of operating conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11757350B2Power converter with over temperature protection compensation

Publication Date: 2023.09.12 CHICONY POWER TECH CO LTD

AI summary

A power converter with over temperature protection compensation includes a main conversion unit, a primary-side control unit, a primary detection circuit, and an over temperature adjustment circuit. The primary-side control unit obtains a primary voltage change value through the primary detection circuit, and the primary-side control unit correspondingly provides a current change value to the over temperature adjustment circuit according to the primary voltage change value. The over temperature adjustment circuit provides a temperature control voltage according to the current change value so that the primary-side control unit determines whether an over temperature protection is activated according to the temperature control voltage.