Vehicle Junction Box Emergency Start via Auxiliary DC/DC Power
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Solution Overview
Problem
Vehicles with exhausted low voltage batteries face challenges in starting the engine, especially in remote areas where rescue vehicles or large power supply devices are not readily available, requiring time-consuming and laborious jump start techniques.
Innovation Solution
An electric junction box for vehicles is designed to include a low-voltage power supply input terminal, low-voltage load output terminals, an operating voltage output terminal, an auxiliary power supply, and a switch circuit that selectively switches between power from the low-voltage battery and the auxiliary power supply to generate the necessary operating voltage for starting the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If jump start technique is used to start vehicle with exhausted battery, then vehicle can be started, but it requires time and effort and needs rescue vehicle or large power supply device
Solution Approach 1:
The patent applies preliminary action by pre-storing power in a capacitor within the junction box. This capacitor can be charged during normal operation and then quickly discharge to provide the necessary power for starting the vehicle when the battery is exhausted, eliminating the need for external rescue vehicles or jump start devices.
Solution Approach 2:
The patent uses a capacitor as an intermediary energy storage device between the battery and the starting system. The capacitor acts as a buffer that can deliver high current instantly for engine cranking, while being recharged from the battery during normal operation, thus mediating the power delivery requirements.
2Use of energy by moving object
If DC/DC converter is used to supply power from high voltage battery to low voltage system, then power can be supplied, but DC/DC converter cannot start when low voltage battery is exhausted
Solution Approach 1:
The patent applies preliminary action by pre-charging a capacitor during normal operation when the low voltage battery is functional. This stored energy in the capacitor then enables the DC/DC converter to start and operate even when the low voltage battery becomes exhausted, ensuring continuous power supply capability.
Solution Approach 2:
The patent uses the capacitor as a cushioning energy reservoir that is filled during normal conditions. This pre-stored energy provides a safety buffer that allows the system to maintain power supply functionality even when the primary low voltage battery fails, cushioning against the reliability loss.
Data Source
AI summary
An electric junction box is equipped with a special simplified power supply. An internal circuit of the electric junction box supplies the output of the simplified power supply as an operating voltage of a DC/DC converter to start the DC/DC converter when battery exhaustion occurs in the low voltage battery. When the DC/DC converter is started, high voltage power stored in a high voltage battery on the vehicle can be stepped down and supplied to a circuit on the low voltage battery, thereby enabling normal starting operations such as starting an engine. An emergency start mode can be selected by a switch operation of a user or by automatic detection of a drop in power supply voltage.