Power Management Device Multi-Functional Pin Brown-Out Overheat Protection
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Solution Overview
Problem
Existing power management integrated circuits (six-pin or high-voltage eight-pin series) are limited in pin count, preventing simultaneous execution of brown-out and overheat protection due to the lack of dedicated pins for both functions.
Innovation Solution
A power management device with a multi-functional pin coupled to both a rectifier for detecting alternating current voltage and a thermistor for overheat protection, utilizing a switching circuit to differentiate between positive and negative half cycles of the voltage cycle to execute brown-out and overheat protection independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power management integrated circuit uses six-pin or high-voltage eight-pin series with insufficient pins, then the device complexity is reduced, but it cannot simultaneously execute brown-out protection and overheat protection
Solution Approach 1:
The patent applies multi-functionality by designing a pin that can serve dual purposes: detecting brown-out conditions during the positive half cycle and detecting overheat conditions during the negative half cycle. This allows the power management integrated circuit to achieve both brown-out protection and overheat protection without requiring separate dedicated pins for each function, thereby resolving the contradiction between protection capability and pin count limitation
2Reliability
If the power management integrated circuit detects brown-out and overheat simultaneously using separate pins, then the reliability is improved, but the device complexity increases due to additional pins
Solution Approach 1:
The patent employs periodic action by utilizing the alternating current voltage cycles (positive and negative half cycles) to sequentially activate different detection functions. During the positive half cycle, the pin detects brown-out conditions; during the negative half cycle, the same pin detects overheat conditions. This time-division multiplexing approach maintains reliable dual protection while avoiding the need for additional pins, thus resolving the contradiction between reliability and device complexity
Data Source
AI summary
A power supply can provide brown-out protection and overheat protection. The power supply includes a rectifier, a transformer, and a power management device. The rectifier is used for receiving an alternating current voltage. The alternating current voltage has a voltage cycle. The transformer coupled to the rectifier has an inductor coupled to a switch for supplying an output voltage. The power management device is used for controlling the switch to make the inductor save power or release power. The power management device has a multi-functional pin coupled to the rectifier for receiving a detection voltage corresponding to a positive half cycle of the alternating current voltage. The multi-functional pin is also coupled to a thermistor for receiving an overheat protection signal.