Display Power Feedback Circuit for Overcurrent Safe Mode
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Solution Overview
Problem
Display devices can malfunction and shut down unexpectedly due to overcurrent, leading to unsafe conditions, particularly in critical applications like transportation devices, and existing power management circuits fail to operate in a safe mode to prevent sudden shutdowns.
Innovation Solution
A power management circuit with a DC voltage converter and feedback circuit that adjusts resistance values based on a safe mode signal to stabilize and reduce output voltage when overcurrent occurs, ensuring stable operation and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power management circuit stops operation when overcurrent occurs, then the safety of the system is improved, but the display device suddenly shuts down and cannot perform normal stopping operations
Solution Approach 1:
The patent implements a dynamic operation mode that allows the power management circuit to switch between normal mode and safe mode based on overcurrent conditions. In safe mode, the circuit continues to operate with limited functionality rather than shutting down completely, enabling both safety protection and continued operation. This is achieved through dynamic control of the DC-DC converter based on feedback from current sensing circuits.
Solution Approach 2:
The patent changes operational parameters by adjusting the output voltage and current limits when transitioning to safe mode. The power management circuit modifies its operating parameters to prevent damage while maintaining basic functionality, allowing the display device to continue operating in a degraded but safe state rather than shutting down completely.
2Reliability
If the power management circuit operates in safe mode with reduced output voltage, then the stability under overcurrent conditions is improved, but the power output capability is reduced
Solution Approach 1:
The patent applies partial action by providing reduced but non-zero power output in safe mode. Rather than completely shutting down or severely limiting power, the circuit provides sufficient power for basic display operation while preventing damage from overcurrent conditions. This partial power delivery maintains stability while preserving essential functionality.
Solution Approach 2:
The patent uses feedback control through current sensing circuits that continuously monitor the output current and adjust the DC-DC converter operation accordingly. When overcurrent is detected, the feedback mechanism triggers safe mode operation, automatically adjusting output parameters to maintain stability while preventing damage.
3Reliability
If the resistance value in the feedback circuit is adjusted based on safe mode signal, then the output voltage is stabilized under overcurrent, but the circuit complexity increases
Solution Approach 1:
The patent merges the safe mode control functionality with the existing feedback circuit by integrating the resistance control circuit into the voltage divider network. The same feedback circuit that normally regulates output voltage now also provides stable voltage division in safe mode through the controllable resistor, eliminating the need for separate control circuitry and reducing overall system complexity.
Solution Approach 2:
The feedback circuit automatically adjusts its own resistance characteristics based on the safe mode signal, providing self-regulation without requiring external intervention. The controllable resistor changes its resistance value in response to the safe mode signal, enabling the feedback circuit to self-adapt to different operating conditions and maintain voltage stability.
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 the display device to operate in a safe mode, stabilizing output voltage and reducing power consumption, preventing sudden shutdowns and ensuring safe operation even under overcurrent conditions.
Implementation Method 1
a resistance control circuit electrically connected between the first input terminal and the output node. The resistance control circuit may be configured to adjust a resistance value between the first input terminal and the output node based on a safe mode signal
Implementation Method 2
an amplifier configured to compare a second input voltage supplied to a first input terminal and a voltage supplied to a second input terminal and to output a first comparison signal
Implementation Method 3
a direct current voltage converter configured to generate an output voltage based on a first input voltage and to output the output voltage to an output node
Data Source
AI summary
A power management circuit includes: a direct current voltage converter configured to generate an output voltage based on a first input voltage and to output the output voltage to an output node; and a feedback circuit configured to generate a feedback signal based on the output voltage output to the output node. The feedback circuit may include: an amplifier configured to compare a second input voltage supplied to a first input terminal and a voltage supplied to a second input terminal and to output a first comparison signal; a feedback signal output circuit configured to output a feedback signal based on the first comparison signal; and a resistance control circuit electrically connected between the first input terminal and the output node. The resistance control circuit may be configured to adjust a resistance value between the first input terminal and the output node based on a safe mode signal.