Keyboard Controller Voltage Detection for Battery Short Circuit Protection
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Solution Overview
Problem
Lithium-ion batteries face safety concerns due to increased heat production and potential explosions from unmanaged heat dissipation, and short circuits between batteries and charging devices can damage both the battery and adapter, necessitating effective protection circuits.
Innovation Solution
A charging device incorporating a charging circuit, voltage detection circuit, and keyboard controller that monitors the voltage at a charging node, stopping the charging process if the voltage drops below a predetermined level to prevent short circuits and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage detection circuitry is added to monitor charging voltage, then battery safety and protection against short circuits is improved, but device complexity increases
Solution Approach 1:
The voltage detection function is merged with the existing keyboard controller by integrating voltage detection circuitry that connects to the keyboard controller's existing data lines. This allows the keyboard controller to perform both its original keyboard scanning function and the new voltage detection function, thereby improving battery safety without significantly increasing device complexity.
Solution Approach 2:
The keyboard controller is designed to serve multiple functions: it continues to handle keyboard input scanning while simultaneously performing voltage detection on the charging node. This multi-functionality approach allows the same controller to monitor both user input and charging safety, eliminating the need for a separate dedicated voltage detection controller.
2Reliability
If continuous voltage monitoring is implemented during charging, then protection against short circuits is improved, but energy consumption increases
Solution Approach 1:
The voltage detection is implemented as a periodic sampling process rather than continuous monitoring. The keyboard controller periodically samples the voltage at the charging node during its normal operation cycles, which provides adequate protection against short circuits while minimizing energy consumption by keeping the detection circuit in a low-power state between sampling intervals.
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 short circuits and protects both the charging device and battery by monitoring voltage and adjusting charging accordingly, enhancing safety and preventing damage from short circuits.
Implementation Method 1
The voltage detection circuit is arranged to detect a voltage at the first node, and produce a voltage detection result accordingly
Data Source
AI summary
A charging device including a charging circuit, a voltage detection circuit, and a keyboard controller is provided. The charging circuit receives a charging power source, and produces a battery-charging power source at a first node by the charging power source to charge a battery. The voltage detection circuit detects a voltage at the first node, and produces a voltage detection result. The keyboard controller determines whether the voltage at the first node is less than a predetermined voltage according to the voltage detection result, and determines whether a predetermined condition has been satisfied, wherein the predetermined condition includes the voltage at the first node being less than the predetermined voltage, and the keyboard controller is arranged to force the charging circuit to stop producing the battery-charging power source at the first node when the predetermined condition has been satisfied.