Door Latch Power Supply With Boost Switching for Stable Motor Operation
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Solution Overview
Problem
Existing vehicle power supply devices struggle to stabilize motor operation due to fluctuations in battery voltage, leading to unstable motor performance.
Innovation Solution
A vehicle power supply device incorporating a backup power supply, a boost unit to stabilize voltage, a motor drive unit, and switching units controlled by a control unit to switch between battery and boost power based on voltage levels, ensuring stable power supply to the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied from the battery to the motor drive unit, then the motor can operate, but the voltage fluctuation causes unstable motor operation
Solution Approach 1:
A DC-DC converter is introduced as an intermediary device between the battery and the motor drive unit. The converter receives fluctuating voltage from the battery and outputs stabilized voltage to the motor drive unit, thereby isolating the motor from battery voltage fluctuations and ensuring stable operation.
Solution Approach 2:
The DC-DC converter dynamically adjusts its conversion ratio to maintain a constant output voltage regardless of battery voltage fluctuations. By changing the conversion parameters in real-time, the system ensures stable motor operation even when battery voltage varies.
2Reliability
If a backup power supply is added to stabilize voltage, then motor operation stability improves, but device complexity increases
Solution Approach 1:
The DC-DC converter serves multiple functions: it acts as a voltage stabilizer during normal operation, functions as a backup power supply when the main battery fails, and provides over-current protection. By consolidating these functions into a single device, the system achieves high reliability without proportionally increasing complexity.
Solution Approach 2:
The backup power supply function is merged with the DC-DC converter rather than being implemented as a separate backup battery system. The converter can switch between drawing power from the main battery and operating in battery mode using its internal capacitor, combining voltage regulation and backup power functions in one component.
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 enables stable motor operation by switching to a stable boost voltage when battery voltage fluctuates, reducing the reliance on fluctuating battery power and enhancing motor reliability.
Implementation Method 1
a boost unit that boosts a voltage of the backup power supply to a predetermined boost voltage
Data Source
AI summary
A vehicle power supply device includes a backup power supply to which power is supplied from a battery mounted in the vehicle, a boost unit that boosts a voltage of the backup power supply to a predetermined boost voltage, a motor drive unit that is connected to the battery and the boost unit and is capable of driving the electric motor by being supplied with power from one of the battery and the boost unit, a first switching unit that conducts or interrupts power supply between the battery and the motor drive unit, a control unit that controls the first switching unit, and a second switching unit that is provided between the boost unit and the first switching unit and turns off the first switching unit when a voltage output from the boost unit becomes equal to or higher than the predetermined boost voltage