Bias Current Boosting Circuit for Low Battery Voltage Operation
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Solution Overview
Problem
Electronic devices face performance degradation when battery voltage decreases below a set regulated voltage level, leading to adverse impacts on bias current and overall device performance.
Innovation Solution
A bias circuitry system with a voltage-controlled switch, such as a MOSFET, is implemented to activate a bias-boosting component when the battery voltage falls below the regulated level, shunting current away from a resistive element to increase the error signal and boost the bias current, thereby compensating for the decreased voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the battery voltage decreases below the regulated voltage level, then the device can continue operating with lower power, but the bias current decreases leading to performance degradation
Solution Approach 1:
The patent changes the operating parameters of the bias circuit by detecting voltage level and dynamically adjusting bias current magnitude. When voltage drops below the regulated level, the circuit transitions to a second operating mode with increased bias current to compensate for performance degradation, thus maintaining reliability while operating on lower battery voltage
Solution Approach 2:
The patent implements a feedback mechanism where the bias circuit monitors the voltage level from the power conditioning circuit and automatically adjusts its operation accordingly. The feedback signal triggers the transition between first and second operating modes, ensuring the bias current is optimized for the current voltage condition, thereby resolving the contradiction between extended operation and maintained performance
2Stability of the object's composition
If a voltage regulator is used to maintain regulated voltage output, then the output voltage remains stable, but the device cannot operate when battery voltage falls below the regulated level
Solution Approach 1:
The patent makes the bias circuit dynamic by enabling it to operate in two distinct modes depending on the input voltage level. When battery voltage is sufficient, the circuit operates in the first mode with standard bias current. When voltage drops below the regulated level, it automatically transitions to the second mode with enhanced bias current, allowing the system to adapt to varying voltage conditions while maintaining functionality
Solution Approach 2:
The patent segments the operating range into two distinct voltage zones: above and below the regulated voltage level. Each zone has its own optimized operating mode with different bias current characteristics. This segmentation allows the system to maintain voltage stability when possible while gaining the adaptability to continue operating in lower voltage conditions through the second mode
3Reliability
If the bias current is increased to compensate for low voltage, then the performance is maintained, but the power consumption increases
Solution Approach 1:
The patent implements dynamic bias current adjustment where the circuit operates in a low-power first mode when voltage is sufficient, and only transitions to the higher-power second mode with increased bias current when absolutely necessary (when voltage drops below regulated level). This dynamic adaptation minimizes overall power consumption while maintaining performance only when required
Solution Approach 2:
The patent changes the bias current parameter based on voltage conditions. In the first operating mode, standard bias current is used for optimal efficiency. In the second operating mode, the bias current parameter is increased to compensate for low voltage effects. This parameter change is conditional and reversible, allowing the system to minimize energy use while maintaining performance when necessary
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
The system effectively boosts the bias current when battery voltage drops, maintaining device performance by increasing the bias current level and ensuring continued operation of power amplifiers even at lower battery voltages.
Implementation Method 1
the MOSFET is in a triode region during the active mode and is in a subthreshold region in the inactive mode
Data Source
AI summary
Aspects of the disclosure include a device comprising an energy storage device configured to provide first power having a first voltage level, a voltage regulator coupled to the energy storage device and configured to receive the first power and regulate the first power to generate regulated power having a set output regulated voltage level, and bias circuitry coupled to the voltage regulator and including an output branch to output a bias current, and a feedback branch to control the bias current, the feedback branch including a bias-boosting component configured to be in an active mode responsive to the first voltage level being below the set output regulated voltage level and to be in an inactive mode responsive to the first voltage level being at or above the set output regulated voltage level.