Power Supply Over-Power Protection Adjustment for Standby Voltage
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Solution Overview
Problem
Existing power supply units cannot adjust the over-power protection value when the output voltage changes, leading to potential system overheating, component burning, and other risks during standby mode.
Innovation Solution
A power supply unit with an over-power protection circuit that includes a switch, a first resistor, and a second resistor, allowing the controller to adjust the over-power protection value based on the output voltage level by changing the resistance value provided by the resistors in parallel or series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the output voltage is reduced to minimize power consumption in standby mode, then energy loss of switching element is reduced, but the over-power protection value cannot be adjusted and system overheating risk increases
Solution Approach 1:
The patent implements dynamic adjustment of the over-power protection value based on the output voltage level. When the power supply enters standby mode with reduced output voltage, the controller automatically adjusts the over-power protection value to a lower threshold. This dynamic adaptation ensures that the protection mechanism remains effective across different operating conditions, preventing system overheating while allowing energy-efficient standby operation.
Solution Approach 2:
The patent changes the over-power protection value parameter according to the output voltage level. In normal mode with higher output voltage, a higher protection value is used; in standby mode with reduced output voltage, a lower protection value is applied. This parameter change strategy allows the system to optimize energy consumption while maintaining appropriate protection levels for each operating state.
2Device complexity
If the over-power protection value remains fixed while output voltage changes, then the protection circuit structure is simple, but over-power protection failure occurs
Solution Approach 1:
The patent integrates the over-power protection adjustment function into the existing controller without requiring a separate protection circuit. The controller performs multiple functions: normal power management, standby mode control, and dynamic over-power protection adjustment. This multi-functionality approach maintains circuit simplicity while ensuring reliable protection across different operating modes.
Solution Approach 2:
The patent implements a feedback mechanism where the controller monitors the output voltage level and automatically adjusts the over-power protection value accordingly. When the output voltage changes between normal and standby modes, the controller receives feedback and modifies the protection threshold to match the current operating condition, ensuring reliable protection without complex additional circuitry.
Data Source
AI summary
A power supply unit provides an output voltage to supply power to a load. The power supply unit includes an over-power protection circuit, and the over-power protection circuit includes a switch, a first resistor and a second resistor. When the output voltage is at a first level, the over-power protection circuit turns on the switch according to the output voltage at the first level to provide a first resistance value based on the first resistor and the second resistor in parallel, so as to adjust the over-power protection value of the power converter to a first value. When the output voltage is at the second level, the over-power protection circuit turns off the switch according to the output voltage at the second level to provide a second resistance value of the second resistor, so as to adjust the over-power protection value to a second value.