Inductor Coil Driver Circuit for Keyless Entry
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Solution Overview
Problem
Conventional keyless vehicle entry and start-up systems face a compromise between data transmission rate, complexity, and energy consumption due to the requirement for high-quality inductive antenna operation, leading to unsatisfactory performance in keyless vehicle entry and start-up systems.
Innovation Solution
A driver circuit for an inductor coil with a capacitor and controllable switches, a switching control device for current and voltage measurement, and modulation capabilities, which allows for efficient oscillating operation with low complexity and interference, enabling high-quality data transmission while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-quality inductive antenna operation is required, then energy consumption is kept low, but data transmission rate is restricted and system complexity increases
Solution Approach 1:
The patent applies dynamics by making the quality factor Q adjustable rather than fixed. The system dynamically adapts the Q-factor based on communication requirements, allowing high Q for energy efficiency during idle periods and low Q for high data rates during active transmission. This is achieved through dynamic adjustment of the resonant circuit parameters or selective use of different antenna configurations.
Solution Approach 2:
The patent changes the operating parameters of the inductive antenna system by adjusting the quality factor Q and operating frequency. The system can switch between different Q-values or frequency settings depending on the communication mode required, thereby optimizing both energy consumption and data transmission rate for different operational scenarios.
2Use of energy by moving object
If accurate tuning for high quality is implemented, then energy consumption is minimized, but system complexity increases
Solution Approach 1:
The patent segments the antenna system into multiple independent resonant circuits or antenna elements with different quality factors. This allows the system to select appropriate Q-values for different communication modes without requiring complex continuous tuning mechanisms, thereby reducing overall system complexity while maintaining energy efficiency.
3Use of energy by moving object
If the inductor coil is operated in an oscillating circuit with capacitor, then energy consumption is low, but the system becomes sensitive to dimensional tolerances
Solution Approach 1:
The patent employs universal components with wide tolerance ranges by using digitally controllable impedance elements that can adapt to varying component values. This allows the resonant circuit to maintain stable operation despite variations in capacitor and inductor values, reducing sensitivity to manufacturing tolerances while preserving energy efficiency.
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 achieves low current consumption, reduced interference radiation, and limited sensitivity to dimensional tolerances, enabling efficient and reliable keyless vehicle entry and start-up systems with high oscillating circuit quality and energy efficiency.
Implementation Method 1
a capacitor (4), which is connected to two inputs (11, 12) for the delivery of a reference voltage (Ur)
Implementation Method 2
the capacitor (4) is discharged via the inductor coil (1) in an oscillating manner
Implementation Method 3
an inductive antenna (1), which may be configured, for example, as a ferrite core with a winding
Data Source
AI summary
A driver circuit, a method for operating an inductor coil and an active transmission system, wherein a capacitor is charged by means of a charging current to a reference voltage and the charged capacitor is discharged in an oscillating manner via the inductor coil. The inductor coil is short-circuited when the voltage on the capacitor or a current flowing in the inductor coil has passed through at least one complete oscillating period.