Jump Starter Battery Detection and Hybrid Switching for Polarity Safety
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Solution Overview
Problem
Existing jump starters face challenges in safely and efficiently delivering high current to depleted or discharged vehicle batteries, particularly in cold weather, and often suffer from issues like short circuits and potential damage due to improper polarity connections, with prior solutions being complex, costly, or prone to malfunction.
Innovation Solution
A jump starter with a battery detection system and a current sharing switch arrangement, featuring a smart switch controlled by a microcontroller, which includes primary and secondary switches in parallel, along with a conductor designed to handle significant current, and incorporates detectors for presence, polarity, and short circuits to ensure safe and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay is used as the safety switch, then durability is improved, but switching speed deteriorates and space requirement increases
Solution Approach 1:
The patent divides the single safety switch function into two separate switches: a relay for durability and a FET for fast switching. This segmentation allows each component to specialize in its strength, resolving the contradiction between durability and switching speed.
Solution Approach 2:
The patent combines a relay and a FET in parallel configuration to create a hybrid switching system. The relay provides durable, slow switching while the FET provides fast, fragile switching, and together they achieve both durability and fast switching capability.
2Speed
If a FET is used as the safety switch, then switching speed is improved and space is reduced, but fragility increases
Solution Approach 1:
The patent segments the switching function between a FET (for speed) and a relay (for durability). The FET handles fast switching requirements while the relay provides durable backup, resolving the fragility issue.
Solution Approach 2:
The patent merges a FET and relay in parallel to combine their advantages. The FET provides fast switching while the relay provides durability, and together they create a system that is both fast and reliable.
3Power
If high current is delivered to the vehicle battery, then jump starting capability is improved, but risk of conductor damage and switching device failure increases
Solution Approach 1:
The patent implements preliminary detection of battery presence and polarity before closing the switches. This preliminary action prevents short circuits and damage by ensuring proper connection conditions are met before high current flows.
Solution Approach 2:
The patent uses detection circuits and control logic to cushion against potential damage by preventing improper connections. The system detects and prevents short circuits before they can cause conductor or switching device failure.
4Reliability
If polarity detection and safety detection systems are added, then safety is improved, but device complexity increases
Solution Approach 1:
The patent designs detection circuits that serve multiple functions: detecting battery presence, detecting polarity, and controlling switch operation. This multi-functionality reduces overall system complexity despite adding safety capabilities.
Solution Approach 2:
The patent combines detection and control functions into an integrated system where the same circuits perform multiple safety-related tasks, reducing the need for separate dedicated components for each function.
Data Source
AI summary
A jump starter for charging or boosting a depleted or discharged battery, the jump starting device, including a rechargeable battery; a positive battery connector for connecting the jump starting device to a positive terminal of the battery; a negative battery connector for connecting the jump starting device to a negative terminal of the battery; a power switch for connecting the rechargeable battery to the depleted or discharged battery when connected to the jump starting device during charging operation of the depleted or discharged battery; a first detector for detecting presence of the depleted or discharged battery connected to the positive and negative battery connectors; and a second detector for detecting presence of the depleted or discharged battery connected to the positive and negative battery connectors.