Dynamic Power Control Circuit for Wireless Devices
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Solution Overview
Problem
Conventional Wi-Fi communication devices consume excessive power and have short speaking times due to fixed output power settings, leading to poor communication quality when signal strength is weak and inefficient battery usage when signal strength is strong.
Innovation Solution
A dynamic power control circuit with an additional power detector, comparator, low pass filter, and adder is introduced between the comparator and antenna, allowing the auto-gain control circuit to adjust output power based on received signal strength by comparing received voltage with a specified limit and adjusting reference voltages to increase power when signals are weak and decrease when strong.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output power is fixed at 15 dBm, then the communication device can maintain a stable reference power level, but the device consumes excessive battery power when signal strength is strong and provides poor communication quality when signal strength is weak
Solution Approach 1:
The patent implements dynamic power control by introducing an additional power detector, comparator, low pass filter, and adder that continuously monitor received signal strength and adjust the output power accordingly. The system transitions from a fixed 15 dBm output to a dynamic adjustment mechanism where the output power varies based on real-time signal conditions, resolving the contradiction between maintaining stable communication quality and reducing power consumption
Solution Approach 2:
The patent employs a feedback mechanism where the additional power detector monitors the received signal strength, compares it with a reference voltage, and feeds back to the adder which adjusts the output power reference. This closed-loop feedback system enables the device to automatically adapt output power to signal conditions, improving communication quality when signals are weak while reducing power consumption when signals are strong
2Reliability
If the output power is increased to enhance communication quality in weak signal areas, then the communication quality improves, but the battery power consumption increases
Solution Approach 1:
The system dynamically adjusts output power based on real-time signal strength monitoring rather than maintaining a fixed high power level. The additional control circuitry continuously adapts the power output to match actual communication needs, ensuring quality when necessary while conserving battery life during normal conditions
3Use of energy by moving object
If the output power is reduced to decrease power consumption, then the battery life extends, but the communication quality deteriorates when signal strength is weak
Solution Approach 1:
The feedback mechanism ensures that power reduction does not compromise communication quality by continuously monitoring signal strength and automatically increasing power when weak signals are detected. The system only reduces power when signal conditions permit, maintaining quality while optimizing power consumption
Data Source
AI summary
The present invention is to provide a dynamic power control circuit for a wireless communication device, which comprises a power detector, a comparator, a low pass filter and an adder disposed between a radio frequency auto-gain control circuit and an antenna thereof. A reference voltage is imposed on the adder to enable the power detector to detect and output signal voltage to the comparator which compares the received voltage with a specified received voltage limit and outputs a reference voltage to the low pass filter for filtering out the noise of the reference voltage and outputting it to the adder. The adder then adds the reference voltage and the specified reference voltage, and outputs the result to the radio frequency auto-gain control circuit for controlling the output power corresponding to the strength of the received signals.