Bidirectional Tractor Battery Module for 12V to 60V Charging
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Solution Overview
Problem
Tractors with 12V electrical systems struggle to charge portable or handheld tools requiring 18 to 60V, and there is a need for a system that can also provide recovery charges to the tractor battery and power accessories needing higher voltages, while managing quiescent current during storage.
Innovation Solution
A tractor battery charging module with step-up and step-down converters, a microprocessor, and a mode selector switch, which allows the tractor electrical system to charge a portable battery and vice versa, while monitoring and controlling charge levels and engine speed to optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tractor electrical system charges the portable battery, then the portable battery can be charged, but the tractor battery voltage must be higher than the portable battery voltage which is not always the case
Solution Approach 1:
The system uses voltage conversion technology to dynamically adjust voltage parameters. When charging the portable battery, the system converts tractor battery voltage (12V) to match the portable battery voltage (18-60V). When charging the tractor battery, the conversion is reversed. This parameter transformation resolves the voltage compatibility issue while maintaining charging capability.
2Adaptability or versatility
If the system supports multiple voltage requirements (12V tractor system and 18-60V portable tools), then versatility is improved, but system complexity increases
Solution Approach 1:
The charging module serves multiple functions: it charges portable batteries from the tractor electrical system, charges the tractor battery from portable batteries, and provides power conversion for various voltage requirements (12V, 18V, 36V, 60V). This multi-functional design consolidates what would otherwise require separate charging systems into a single universal device.
Solution Approach 2:
The voltage converter acts as an intermediary between the tractor electrical system and portable batteries with different voltage requirements. It mediates the voltage mismatch by transforming electrical parameters, enabling compatibility between systems that would otherwise be incompatible.
3Reliability
If the microprocessor monitors and controls charging in both modes, then charging safety is improved, but control system complexity increases
Solution Approach 1:
The microprocessor implements feedback control by continuously monitoring battery voltage, current, and charge state in both charging modes. It adjusts charging parameters in real-time based on feedback from the batteries, preventing overcharging, undercharging, and other unsafe conditions. This closed-loop control ensures safety while managing the complexity through intelligent automation.
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
Enables efficient charging of portable tools and tractor batteries, supports accessories with higher voltage requirements, and manages quiescent current during storage, ensuring reliable operation and battery health monitoring.
Implementation Method 1
The step down converter converts a higher portable battery voltage up to 60V DC to a lower tractor electrical system voltage such as 12V DC
Implementation Method 2
The step up converter converts a lower tractor electrical system or tractor battery voltage such as 12V DC to a higher portable battery voltage that is up to 60V DC
Data Source
AI summary
A tractor battery charging module includes a compartment where a portable battery for a handheld battery power tool may be stored and connected to a tractor electrical system. The tractor electrical system charges the portable handheld tool battery in a first mode when the tractor ignition is on, and the portable handheld tool battery recharges the tractor battery in a second mode when the tractor ignition is off. The first mode includes a step up converter to convert the tractor electrical system voltage to the portable battery voltage, and the second mode includes a step down converter to convert the portable handheld tool battery voltage to the tractor electrical system voltage.