Power Supply Overvoltage Protection Switch Control
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Solution Overview
Problem
Power supply devices often fail to enable overvoltage protection when power switches malfunction during boot-up, leading to potential permanent damage to electronic products due to direct input of external voltage.
Innovation Solution
A power supply device incorporating an energy storage unit, first and second switches, and a driving module that selectively conducts the second switch when the supplied voltage reaches a predetermined value, generating driving signals to manage the voltage and prevent overvoltage through pulse width modulation, ensuring the voltage is not directly inputted to the energy storage unit if a switch fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power switches are used to adjust driving voltage, then stable driving voltage is achieved, but overvoltage protection fails when switches malfunction during boot-up
Solution Approach 1:
The patent implements preliminary overvoltage protection action by conducting the second switch before the power supply device boots up. This preliminary action ensures that if the first switch fails open, the protection mechanism is already in place to prevent direct voltage input damage to the load circuit, resolving the timing issue where protection failed during boot-up
2Object-affected harmful factors
If the second switch is conducted early to provide protection, then overvoltage damage is prevented, but voltage adjustment capability may be affected
Solution Approach 1:
The patent employs dynamic switch control where the second switch transitions from a conductive state during boot-up (providing protection) to a controllable state during normal operation (allowing voltage adjustment). The driving module dynamically adjusts the second switch based on operating conditions, maintaining both protection capability and voltage regulation functionality
Data Source
AI summary
A power supply device and an overvoltage protection method are disclosed. The power supply device includes an energy storage unit, a first switch, a second switch and a driving module. The energy storage unit generates a driving voltage according to a supplied voltage. The first switch selectively transmits the supplied voltage to the energy storage unit according to a first driving signal. The second switch is selectively conducted to adjust the driving voltage according to a second driving signal. The driving module conducts the second switch when the supplied voltage is rose at a first predetermined value, and generates the first driving signal and the second driving signal after the supplied voltage is rose at a second predetermined value. The first predetermined value is smaller than the second predetermined value.