Three-Axis Antenna DC Voltage Circuit with Limiting Regulator

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Solution Overview

Problem

The electromagnetic coupling charging circuit has poor charging efficiency due to voltage drops across diodes and varying signal amplitudes with distance, which can damage subsequent circuits.

Innovation Solution

A circuit utilizing a three-axis antenna set, a limiting direct current voltage generator, and a low dropout regulator to convert and regulate X-axis, Y-axis, and Z-axis components of a signal into stable direct current voltages, preventing voltage fluctuations that could harm connected circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a diode is used for electromagnetic coupling charging, then the circuit can charge the capacitor, but the charging efficiency is poor due to voltage drop of the diode

Engineering Contradiction:

Improvecharging efficiencyVSAvoidvoltage drop

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent removes the diode from the charging circuit and replaces it with a synchronous rectification circuit using MOSFETs. This extraction of the problematic diode component eliminates the forward voltage drop loss while maintaining the rectification function, directly resolving the contradiction between charging efficiency and energy loss.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent substitutes the passive diode rectification mechanism with an active synchronous rectification mechanism using MOSFETs controlled by control signals. This replacement transitions from a simple passive component to an actively controlled system that minimizes voltage drop and maximizes charging efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If the antenna couples the electric wave, then the charging circuit can receive energy, but the amplitude varies with distance which may damage another circuit

Engineering Contradiction:

Improveenergy receptionVSAvoidvoltage damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements preliminary voltage limiting by placing voltage limiting circuits at the input stage of the charging circuit, before the variable amplitude signals can propagate to other circuits. This proactive measure prevents potential damage while maintaining reliable energy reception from the antenna.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces voltage limiting circuits as intermediary components between the antenna and other circuits. These intermediaries clamp the voltage to safe levels, acting as a protective buffer that allows energy reception while preventing harmful voltage spikes from reaching sensitive circuits.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution enhances charging efficiency and stability by limiting voltage fluctuations, protecting downstream circuits and ensuring consistent direct current output voltages.

Implementation Method 1

an inductor 102, an antenna capacitor 104, a diode 106, and a charging capacitor 108, where the antenna capacitor 104 is used for adjusting a resonant frequency between the antenna capacitor 104 and the inductor 102 to match a frequency of an electric wave RW transmitted by a reader 110, and the inductor 102 is used for coupling the electric wave RW transmitted by the reader 110

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Implementation Method 2

The first capacitor is coupled to the output terminal of the three-axis antenna set for generating a first direct current voltage according to the X-axis component, the Y-axis component, and the Z-axis component

Methodology Applied

Scientific EffectCapacitive rectification: Capacitance

Data Source

PatentUS8716901B2Circuit for generating a direct current voltage and method thereof

Publication Date: 2014.05.06 AMICCOM ELECTRONICS CORP

AI summary

A circuit for generating a direct current voltage includes a three-axis antenna set, a first capacitor, a limiting direct current voltage generator, a second capacitor, and a low dropout regulator. The three-axis antenna set receives a signal transmitted by a reader. The first capacitor generates a first direct current voltage according to an X-axis component, a Y-axis component, and a Z-axis component of the signal. The limiting direct current voltage generator limits and converts the X-axis component, the Y-axis component, and the Z-axis component to generate an X-axis direct current voltage, a Y-axis direct current voltage, and a Z-axis direct current voltage. The second capacitor generates a second direct current voltage according to the X-axis direct current voltage, the Y-axis direct current voltage, and the Z-axis direct current voltage. The low dropout regulator generates a direct current output voltage according to the second direct current voltage.