Protection Circuit for Charging Socket Short-Circuit Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices experience unstable performance due to short-circuiting of charging pins and ground pins during disconnection, leading to sudden current discharge from the battery.
Innovation Solution
Incorporation of a protection circuit with a controller, sensing end, resistors, capacitors, and a PMOS switch in the power management unit to control electrical connections between the battery and charging socket, ensuring the battery does not output current when pins are short-circuited during disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging socket is connected to a charging plug for power transmission, then the electronic device can be charged, but the charging pin and ground pin may short-circuit during disconnection causing unstable device operation
Solution Approach 1:
The protection circuit detects the disconnection state of the charging plug in advance and proactively adjusts the electrical connection between the battery and charging socket before the short-circuit current can occur. The controller monitors the connection status and preemptively opens the PMOS switch when disconnection is detected, preventing the harmful short-circuit current from flowing through the battery while maintaining stable device operation.
2Reliability
If the charging pin and ground pin are short-circuited during disconnection, then the battery outputs high current to ground, but this pulls down the power supply and causes unstable device performance
Solution Approach 1:
The protection circuit acts as an intermediary between the battery and the charging socket, controlling the electrical connection through a PMOS switch. When the charging plug is disconnected, the protection circuit mediates by opening the switch to block the short-circuit current path, preventing the battery from outputting harmful current to ground while maintaining stable power supply to the device. This intermediary control mechanism isolates the battery from the short-circuit condition.
3Reliability
If no protection circuit is used, then the device structure is simpler, but the battery outputs current during pin short-circuiting causing performance instability
Solution Approach 1:
The protection circuit provides self-service protection by autonomously monitoring the charging socket connection status and automatically controlling the PMOS switch to prevent short-circuit current. The controller detects the disconnection state and triggers the protection mechanism without external intervention, enabling the device to self-protect against performance instability caused by pin short-circuiting during disconnection.
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
Prevents unstable power supply to the electronic device by maintaining stable operation even when charging pins and ground pins are short-circuited during plug disconnection.
Implementation Method 1
a capacitor, coupled between the sensing end and a second node. The first node is further coupled to a power input that receives a first voltage. The second node is further coupled to a power management unit. The capacitor maintains a voltage level at the first node when the plug is disconnected from the charging socket
Implementation Method 2
The controller includes a PMOS. A control end of the PMOS is coupled to the first node. The first conductive end of the PMOS is coupled to a charging pin. The second conductive end of the PMOS is coupled to the power management unit
Data Source
AI summary
An electronic device includes a charging socket, a protection circuit, and a battery. The charging socket includes a charging pin. The charging pin is detachably connected to a charging plug of a power supply device, receives power from the power supply device, and transmits the power to the battery. The protection circuit is connected between the battery and the charging socket, and controls whether the battery is electrically connected to the charging pin. During a process of disconnecting the charging socket from the charging plug, the protection circuit disconnects the battery from the charging pin before the charging pin is disconnected from the charging plug.