Power Shutdown Latching for Abnormal Voltage and Current
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Solution Overview
Problem
Conventional electronic devices lack effective mechanisms to prevent damage from power abnormalities, such as overvoltage and overcurrent, as their protection mechanisms may fail to activate in time or get repeatedly triggered, causing circuit element damage.
Innovation Solution
A power management device comprising a switch, detection circuit, and controller that monitors internal and operation powers against preset specifications, generates a protection signal, sets a flag, and executes an application program to control the switch, ensuring safe shutdown during power abnormalities and latching the abnormal state until rectified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protection mechanism is used, then over-voltage and over-current protection is provided, but the protection mechanism fails to activate in time and causes damage to circuit elements
Solution Approach 1:
The controller executes an application program to perform preliminary detection and judgment before the protection mechanism activates. The detection circuit continuously monitors power parameters, and the controller pre-judges whether abnormalities exist, enabling timely protection activation before damage occurs
Solution Approach 2:
The detection circuit provides continuous feedback on power parameters (internal power and operation power) to the controller. This feedback mechanism enables real-time monitoring and immediate response when parameters deviate from the preset specification range, ensuring timely protection activation
2Ease of operation
If the protection mechanism is triggered repeatedly without proper latching, then power supply reactivation occurs, but the protection mechanism is triggered again when malfunction has not been rectified, causing circuit element damage
Solution Approach 1:
Before allowing power supply reactivation, the controller performs preliminary detection to confirm whether the malfunction has been rectified. The protection flag is cleared only after verifying that power parameters are within the specification range, preventing premature reactivation that could cause repeated damage
Solution Approach 2:
The protection flag acts as an intermediary state between protection activation and power supply reactivation. This flag mechanism ensures that the protection mechanism remains stable by requiring explicit verification before clearing the protection state and allowing reactivation, thus preventing repeated triggering
Data Source
AI summary
A power management device and a management method thereof are provided. The power management device includes a switch, a detection circuit and a controller. The switch receives an external power. The detection circuit receives an internal power and at least one operation power. The detection circuit determines whether at least one of the internal power and the operation power is in a preset specification range or not to generate a protection activate signal. The controller sets a protection flag according to the protection activate signal, and generates a control signal according to the protection flag by executing an application program. The controller transmits the control signal to turn off the switch.