Wireless RF Power Control for Low-Power Radio Reception
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Solution Overview
Problem
RFID tags that operate using an external power source face issues with high power consumption due to constant operation during waiting times for communication initiation, and those relying solely on rectified radio waves have limited communication distance.
Innovation Solution
A wireless communication device with an antenna, detector, circuit part, regulator, and radio wave detection/control part that stops the generation of internal power source voltage when the antenna is not receiving a radio wave, using a rectifier circuit and transistor configuration to control power supply to the regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless communication device operates in a constant operating state to wait for communication initiation from an external power source, then the device can respond immediately when communication is initiated, but power consumption increases during waiting time
Solution Approach 1:
The patent applies dynamics by transitioning the device between two operational states: a low-power standby state where the regulator is stopped, and a full-operation state when communication is initiated. The radio wave detection control part dynamically controls the regulator's operation based on whether a radio wave is detected, allowing the device to adapt its power consumption to actual communication needs while maintaining the ability to respond when communication is initiated.
Solution Approach 2:
The patent implements periodic action through the radio wave detection control part that periodically monitors for radio waves and intermittently activates the regulator only when needed. Instead of continuous operation, the regulator is activated in periodic intervals corresponding to radio wave detection events, reducing overall power consumption while ensuring the device is operational when communication occurs.
2Ease of operation
If the regulator continuously generates internal power source voltage to ensure immediate operation, then the device can maintain ready state for communication, but power consumption increases during non-reception periods
Solution Approach 1:
The patent applies preliminary action by having the radio wave detection control part detect the presence of radio waves before activating the regulator. This preliminary detection ensures that the device is already aware of incoming communication and can activate power generation just in time, maintaining operational readiness without continuous energy consumption during non-reception periods.
3Use of energy by moving object
If the device stops regulator operation to reduce power consumption, then energy efficiency improves, but the device may miss communication initiation timing
Solution Approach 1:
The patent implements feedback through the radio wave detection control part that continuously monitors for radio waves and provides real-time feedback to the regulator. When a radio wave is detected, the control part immediately activates the regulator, ensuring the device responds to communication initiation without delay. This feedback mechanism eliminates the need for continuous operation while maintaining timely response capability.
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
Reduces power consumption by stopping power supply to the regulator during non-reception states and enhances communication sensitivity by generating a higher voltage from a small input, extending the communication range.
Implementation Method 1
an antenna, in response to receiving a radio wave, transmitting a radio frequency signal corresponding to the radio wave
Implementation Method 2
a detector, detecting the radio frequency signal to obtain a detection signal
Data Source
AI summary
A wireless communication device of the disclosure includes: an antenna, in response to receiving a radio wave, transmitting a radio frequency signal corresponding to the radio wave; a detector, detecting the radio frequency signal to obtain a detection signal; a circuit part, performing signal processing based on reception data obtained by performing demodulation processing on the detection signal; a regulator, in response to receiving an external power source voltage from an external source, generating and supplying an internal power source voltage for operating the circuit part to the circuit part; and a radio wave detection control part, detecting whether or not the antenna is receiving a radio wave and stopping a generation operation of the internal power source voltage by the regulator in response to the antenna not receiving the radio wave.