Antenna Driving Apparatus Using Diode for Reverse Current Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing smart key system antenna driving apparatus is bulky and costly due to the need for multiple connecting lines and large capacitors to prevent reverse current flow, which increases the complexity and expense of the system.
Innovation Solution
The proposed antenna driving apparatus uses a direct current power source and an antenna driving circuit that outputs a signal by switching between the direct current power source voltage and a reference potential, eliminating the need for capacitors by maintaining the antenna drive signal's ON voltage at the same value as the direct current power source voltage, and includes a protective diode to prevent reverse current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitors are provided to prevent reverse current flow, then the reliability of the power source is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the capacitor component from the circuit by using a diode to perform the reverse current prevention function. The diode is connected in series with the power source output, allowing current to flow only in the forward direction and automatically blocking any reverse current without requiring capacitors.
Solution Approach 2:
The patent replaces expensive and bulky capacitors with a simple, inexpensive diode. The diode is a basic semiconductor component that provides the same protective function at much lower cost and with minimal circuit complexity, effectively serving as a disposable protective element.
2Stability of the object's composition
If large capacitors are provided to reduce resonant circuit effects, then the stability of the antenna drive signal is improved, but the device complexity and cost increase
Solution Approach 1:
The patent removes the capacitor from the circuit configuration entirely and replaces its stabilizing function with a diode-based protection mechanism. The diode ensures stable operation by preventing reverse current that could cause signal instability, eliminating the need for large capacitance values.
Solution Approach 2:
The patent replaces the electrical stabilization mechanism (capacitors) with a semiconductor-based mechanism (diode). This substitution changes the approach from passive electrical filtering to active semiconductor protection, achieving signal stability without bulky capacitive components.
3Device complexity
If the antenna drive signal is superimposed on DC voltage, then the connecting line can be shared, but the electronic communication module requires a larger rating
Solution Approach 1:
The patent segments the signal transmission by using separate connecting lines for power and signal. The power line carries only DC voltage with a diode for protection, while the signal line carries only the antenna drive signal. This segmentation prevents voltage superposition and allows each component to be rated for its specific function without requiring excessive power handling capability.
Solution Approach 2:
The patent introduces a diode as an intermediary component between the power source and the circuit. This diode acts as a one-way valve for current flow, ensuring that power and signals remain separated and preventing the DC voltage from being superimposed with the antenna drive signal, thus protecting the electronic communication module from excessive voltage stress.
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
This configuration reduces the size and cost of the apparatus by eliminating the need for large capacitors and maintaining the antenna drive signal's amplitude, while ensuring efficient operation without applying the antenna drive signal to the human detection IC when switching from the antenna drive signal to the direct current power source voltage.
Implementation Method 1
a protective diode connected between the direct current power source and the antenna driving circuit and configured to prevent a current caused by the direct current power source voltage from flowing reversely toward the direct current power source via the antenna driving circuit
Data Source
AI summary
An antenna driving apparatus includes: a direct current power source supplying direct current power to a human detecting IC detecting contact to a human detecting area by a user, the power source outputting a power source voltage to a first connecting line connected to a power source terminal of the IC and outputting a reference potential to a second connecting line connected to a GND terminal of the IC; an antenna driving circuit driving an antenna transmitting a signal to a portable device, the antenna driving circuit outputting a first antenna drive signal to the first connecting line and outputting an antenna drive signal; and a control unit performing switching control of the power source voltage and the antenna drive signal to be output to the first and second connecting lines and switching control of the antenna driving circuit.