Charger Output Protector Using MOS Tube Switching
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Solution Overview
Problem
Chargers often fail to prevent internal circuit burning and safety accidents when reversed connected to battery terminals, and they cannot completely stop charging once done.
Innovation Solution
An output protector for chargers using a MOS tube as an electronic switch, connected to a triode on-unit, capacitors, and a light switchover signal terminal, which provides no-load, reverse connection, and full charge switch-off protection by controlling the MOS tube's operation based on voltage and signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charger is reversely connected to the battery terminals, then the charging function is available, but the internal circuit of charger and battery are likely to be burnt and safety accidents are likely to happen
Solution Approach 1:
The patent applies preliminary anti-action by using a MOS tube as an electronic switch that is pre-configured to block reverse connection currents. The circuit includes protection components arranged in advance to prevent harmful effects before they occur. When reverse connection is detected, the MOS tube immediately stops conducting, preventing internal circuit burning and safety accidents before they can happen.
2Duration of action of moving object
If the charger continues charging after battery is full, then the charging function is maintained, but the charger cannot switch off the circuit completely to stop charging the battery
Solution Approach 1:
The patent implements feedback by connecting the light switchover signal terminal to the grid of the MOS tube. When the battery is fully charged, the charger detects this state and sends a signal through the light switchover signal terminal to the MOS tube grid, causing the MOS tube to turn off and stop the charging current. This feedback mechanism ensures the charger automatically switches off the circuit when charging is complete, preventing overcharging.
3Reliability
If a protection circuit is added to the charger, then safety protection is improved, but the device complexity increases
Solution Approach 1:
The patent uses a MOS tube as an intermediary component that provides comprehensive protection functionality while maintaining relatively simple circuit structure. The MOS tube acts as a controllable switch that can be easily controlled by voltage signals from the first capacitor and light switchover signal terminal. This intermediary approach allows the protection circuit to achieve high reliability without significantly increasing device complexity, as the MOS tube integrates multiple protection functions in a single component.
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
The solution effectively prevents internal circuit damage, ensures safe charging by preventing reverse connections, and automatically stops charging when complete, enhancing charger safety and functionality with multiple protection features.
Implementation Method 1
the output protector includes a MOS tube as an electronic switch, a light switchover signal terminal connected to a grid of the MOS tube
Implementation Method 2
a power output V+ terminal connected to the grid of the MOS tube through a first capacitor
Implementation Method 3
the output protector has a triode on-unit which drives the MOS tube after the power output V+ terminal and power output V− terminal are connected to the anode and cathode of battery respectively
Data Source
AI summary
An output protector for chargers connected to the output terminal of charger, comprising a MOS tube as electronic switch, a light switchover signal terminal, a power output V+ terminal, a power GND terminal connected to the source of the MOS tube, and a power output V− terminal connected to the drain of the MOS tube. The power output V+ terminal and power GND terminal are connected to the output terminal anode and cathode of charger respectively. The light switchover signal terminal is connected to the charging state signal output end of charger. The power output V+ terminal and power output V− terminal are connected to the anode and cathode of battery, and the output protector has a triode on-unit which drives the MOS tube after the power output V+ terminal and power output V− terminal are connected to the anode and cathode of battery respectively.