Automotive Alarm Voltage Stabilization Using Booster Circuit
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Solution Overview
Problem
Existing motor vehicle alarm devices face issues with varying sound pressure levels due to temperature-dependent voltage fluctuations from internal auxiliary batteries and limited lifespan due to voltage decreases during discharge.
Innovation Solution
An alarm device with a power supply terminal connected to an external voltage source, utilizing diodes and a control circuit to maintain a constant voltage, incorporating a voltage booster with an integrated circuit to ensure stable operation and prevent accumulator discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal auxiliary battery is used to power the alarm device when the vehicle battery fails, then the alarm device remains operational, but the voltage supplied varies greatly with temperature and decreases when discharged, causing sound pressure level variation and limited service life
Solution Approach 1:
A voltage booster circuit is introduced as an intermediary between the internal auxiliary battery and the alarm device. This mediator converts the varying battery voltage into a stable output voltage, thereby maintaining consistent sound pressure level while preserving the operational continuity provided by the auxiliary battery.
Solution Approach 2:
The voltage booster dynamically adjusts its output parameters based on the input voltage from the auxiliary battery. By changing the voltage parameter through active conversion rather than direct connection, the system maintains stable alarm output despite variations in battery voltage due to temperature or discharge state.
2Reliability
If the internal auxiliary battery is discharged to power the alarm device, then the alarm remains functional, but the service life of the alarm device is limited due to voltage decrease during discharge
Solution Approach 1:
The voltage booster maintains a constant output voltage parameter throughout the discharge cycle of the auxiliary battery. This parameter transformation allows the alarm device to operate at full performance level from the beginning to the end of the battery's discharge capacity, maximizing service life without voltage-related performance degradation.
3Ease of manufacture
If diodes are used to connect the external voltage source and internal voltage source to the alarm generator, then power supply paths are established, but voltage regulation and stabilization require additional control circuitry
Solution Approach 1:
The voltage booster circuit serves multiple functions simultaneously: it acts as a voltage regulator, a power management device, and a protection circuit. By consolidating these functions into a single multi-functional component, the patent reduces overall device complexity while maintaining the necessary power supply paths established by the diodes.
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 maintains a consistent sound pressure level and extends the alarm device's lifespan by stabilizing voltage output across temperature variations and discharge conditions.
Implementation Method 1
a voltage booster capable of converting a voltage supplied by the accumulators to a substantially constant voltage
Implementation Method 2
a first diode capable of connecting the external voltage source to the alarm generator and a second diode connecting the internal voltage source to the alarm generator
Data Source
Figure 1
AI summary
The device (1) has an alarm generator (3) for generating a sound or video signal. An internal power source (2) has a voltage riser (13) for delivering a constant voltage, when the voltage is supplied by an accumulator (12) in the determined range to supply the constant voltage to the generator. A supply terminal (4) is connected to a battery (5) to supply the external voltage to the generator by the battery. A control circuit (8) activates and deactivates the voltage riser based on voltage supplied by the battery.