Vehicle Door Handle Antenna Parallel DC Detection Circuit
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Solution Overview
Problem
Existing door handle devices for vehicles face challenges in maintaining communication distance and convenience due to the shared power supply for the detection member and antenna, which requires setting the induced voltage to a rated voltage or less, limiting output levels and convenience.
Innovation Solution
A door handle device with an antenna and detection member connected in parallel via separate lines, using a charge control circuit with a switch to manage voltage, allowing the antenna to be driven by AC and the detection member by DC, with a resonance capacitor and coil, and diodes for voltage regulation, ensuring the detection member operates within safe voltage limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the induced voltage of the antenna is utilized to supply power to the detection member, then the power supply connection can be simplified, but the communication distance is shortened and convenience is impaired
Solution Approach 1:
The patent divides the power supply system into two independent paths: one for the antenna (AC voltage) and one for the detection member (DC voltage). This segmentation allows each component to receive appropriate voltage without interference, resolving the contradiction between simplified connections and maintained communication distance.
Solution Approach 2:
The patent introduces a voltage conversion circuit as an intermediary between the antenna and detection member. This mediator converts the AC voltage from the antenna to DC voltage for the detection member, enabling independent power supply while maintaining both communication distance and detection functionality.
2Reliability
If the induced voltage is set to a rated voltage or less to protect the detection member, then the detection member operates safely, but the antenna output level is suppressed and convenience is impaired
Solution Approach 1:
The patent separates the voltage supply paths so that the antenna can operate at high output levels without being constrained by the detection member's rated voltage. The detection member receives regulated DC voltage independently, allowing both high antenna performance and safe detection member operation.
Solution Approach 2:
The patent changes the voltage parameter from a single shared voltage to separate AC and DC voltages. The antenna operates with AC voltage at higher levels for better communication, while the detection member receives converted DC voltage at safe rated levels, resolving the contradiction between reliability and convenience.
3Device complexity
If shared electric wires are used for both antenna and detection member power supply, then the circuit is simplified, but voltage interference occurs and detection accuracy is affected
Solution Approach 1:
The patent segments the electrical connections into separate paths: one for the antenna and one for the detection member. This eliminates voltage interference between the two components while maintaining circuit simplicity through systematic separation rather than complex shielding or filtering.
Solution Approach 2:
The patent introduces a voltage conversion circuit as an intermediary that isolates the antenna and detection member electrical paths. This mediator prevents voltage interference from the antenna from affecting the detection member, ensuring detection accuracy while maintaining circuit simplicity.
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 maintains communication distance and convenience by preventing excessive voltage, reducing the need for increased rated voltages and component sizes, and simplifying the circuit while saving power and reducing costs.
Implementation Method 1
it has been proposed to utilize an induced voltage (resonance voltage) of the antenna
Implementation Method 2
The antenna includes a resonance capacitor and an antenna coil which are connected in series
Data Source
AI summary
A door handle device for a vehicle includes: an antenna and a DC driving detection member capable of detecting approach or contact of a person, the antenna and the DC driving detection member being electrically connected to a drive control portion via a first connection line and a second connection line, and being connected in parallel to each other. The antenna is driven by an AC voltage supplied from the drive control portion, the first connection line and the second connection line are respectively connected to a positive DC power source and a ground, and thereby the detection member is driven by a DC voltage supplied from the drive control portion, the antenna includes a resonance capacitor and an antenna coil which are connected in series. The detection member includes a power source terminal, and a ground terminal.