Power Amplifier Overcurrent Protection Circuit for Bias Voltage Control
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Solution Overview
Problem
Mobile electronic devices face burnout issues due to overcurrent flowing through their RFFE circuits, particularly in power amplifiers, which can be caused by changes in internal resistance, leading to damage or interruption of normal operation.
Innovation Solution
An overcurrent protection circuit is implemented in electronic devices, comprising a configurer to set a reference current value, a measurer to measure the bias current, a comparator to compare the measured current with the reference, and a controller to recognize overcurrent and control the bias voltage supply, thereby preventing excessive current from reaching the power amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant level of voltage is supplied from the battery to the RFFE circuit, then normal operation is maintained, but overcurrent may flow through the IC when internal resistance changes, causing burnout or damage
Solution Approach 1:
The overcurrent protection circuit performs preliminary detection of current levels before overcurrent damage can occur. The detection unit continuously monitors the current flowing through the IC, and when a threshold is approached, the control unit preemptively adjusts the voltage supply to prevent overcurrent conditions, thereby protecting the IC before damage can occur.
Solution Approach 2:
The protection circuit implements a feedback mechanism where the detection unit monitors current flow and feeds this information back to the control unit. Based on this feedback, the control unit dynamically adjusts the voltage supply from the battery to maintain safe operating conditions, creating a closed-loop system that prevents overcurrent while enabling normal operation.
2Power
If overvoltage is instantaneously supplied from the battery to the RFFE circuit, then power delivery is improved, but overcurrent flows through the power amplifier, interrupting normal operation or causing burnout
Solution Approach 1:
The control unit preemptively detects current trends and adjusts voltage supply before overcurrent conditions develop. By monitoring the current flowing through the power amplifier and anticipating potential overcurrent situations, the system adjusts power delivery in advance to prevent burnout while maintaining operational continuity.
Solution Approach 2:
The protection circuit dynamically adjusts the voltage supply based on real-time current conditions. Rather than using a fixed voltage level, the control unit continuously modulates the voltage to match the actual operating conditions of the power amplifier, enabling both high power delivery when safe and protection when current limits are approached.
Data Source
AI summary
An electronic device and method thereof of are provided to prevent burnout due to overcurrent. An electronic device includes a power amplifier configured to amplify a transmission signal; a battery configured to provide a bias voltage to the at least one power amplifier; and an overcurrent protection circuit configured to prevent overcurrent from flowing through the power amplifier. The overcurrent protection circuit includes a configurer configured to configure a reference current value, based on the power amplifier; a measurer configured to measure a bias current value due to the bias voltage; a comparator configured to compare the measured bias current value with the reference current value; and a controller configured to recognize overcurrent flowing through the power amplifier and control provision of the bias voltage, based on a result of the comparison.