Self-Locking Power Supply Circuit for Battery Transport Protection
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Solution Overview
Problem
Existing power supply circuits in electronic products fail to effectively lock batteries during transportation to prevent over-discharge, compromising both consumer experience and battery safety during long periods of inactivity.
Innovation Solution
A self-locking power supply circuit utilizing PMOS and NMOS transistors, controlled by a micro-controller, to manage the power supply path of the battery, enabling it to be locked during transportation and easily unlocked for use, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is left unlocked during transportation, then the electronic product is ready for immediate use, but the battery may over-discharge and be damaged due to long periods of inactivity
Solution Approach 1:
The power supply circuit is configured to automatically lock the battery before transportation, preventing over-discharge in advance. This preliminary locking action ensures battery safety during storage and transit, while the circuit is designed to automatically unlock upon connection to an external power source, providing ready-to-use experience without manual intervention.
Solution Approach 2:
The power supply circuit performs self-locking and self-unlocking operations based on power source detection. When no external power is detected, the circuit automatically locks the battery; when external power is connected, it automatically unlocks. This self-service mechanism resolves the contradiction by eliminating the need for manual user action while ensuring both battery safety and consumer convenience.
2Reliability
If a manual locking mechanism is added to prevent battery discharge, then battery safety is improved, but the device complexity increases
Solution Approach 1:
The power supply circuit incorporates feedback mechanisms that continuously monitor the power source status. When the microcontroller detects connection or disconnection of external power sources, it automatically triggers the locking or unlocking of the battery through control signals to the power switch. This feedback-based automatic control achieves reliable battery protection without requiring complex manual locking mechanisms.
Solution Approach 2:
The power supply circuit integrates multiple functions including power management, locking control, and status monitoring into a single unified system. The microcontroller coordinates these functions, allowing the same circuit to handle both normal power supply operations and battery locking/unlocking, thereby avoiding the need for separate dedicated locking hardware and reducing overall device complexity.
3Loss of energy
If the battery is locked during transportation, then power consumption is reduced, but the consumer experience is degraded due to inability to use immediately
Solution Approach 1:
The battery is locked in advance during manufacturing and transportation to minimize power consumption. The circuit is pre-configured to automatically unlock upon detecting external power connection, ensuring the battery is ready for use immediately when the consumer receives the product, thus eliminating the need for manual unlocking operations.
Solution Approach 2:
The power supply circuit automatically manages the locking and unlocking states based on power source detection without requiring user intervention. This self-service approach reduces power consumption during storage while ensuring ready-to-use experience for consumers, as the circuit handles the entire locking/unlocking process autonomously.
Data Source
AI summary
A self-locking power supply circuit includes the battery, a grounding end, an outputting end, a mode switching end, a P-channel metal oxide semiconductor (PMOS) transistor, an N-channel metal oxide semiconductor (NMOS) transistor and a first resistor. The P-channel metal oxide semiconductor (PMOS) transistor includes a first source electrode electrically connected to the outputting end, a first drain electrode electrically connected to the battery, and a first gate electrode. The N-channel metal oxide semiconductor (NMOS) transistor includes a second source electrode electrically connected to the grounding end, a second drain electrode electrically connected to the first gate electrode, and a second gate electrode electrically connected to the mode switching end. One end of the first resistor is connected between the battery and the first drain electrode, and the other end of the first resistor is connected between the first gate electrode and the second drain electrode.