Charging Circuit With Adaptive Phase Compensation for Wide Current Range
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Solution Overview
Problem
Charging circuits face stability issues when the charging current range is wide, affecting the phase and gain margins of the feedback loop, complicating the design.
Innovation Solution
A charging circuit with a constant current feedback loop that includes a variable phase compensation parameter, adjusting to the current flowing through a transistor, using a current setting resistor and transistors to stabilize the charging current across a wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide range is set for the charging current, then the adaptability of the charging circuit is improved, but the stability of the feedback loop deteriorates
Solution Approach 1:
The patent applies dynamics by making the phase compensation parameter variable rather than fixed. The phase compensation circuit adjusts its parameters dynamically based on the operating conditions to maintain feedback loop stability across different charging current ranges. This is achieved through a phase compensation circuit that can change its compensation characteristics adaptively, resolving the contradiction between wide current range adaptability and feedback loop stability.
Solution Approach 2:
The patent changes the phase compensation parameter according to the charging current flowing through the first transistor. By adjusting the phase compensation parameter based on the operating current, the feedback loop maintains optimal stability margins across the entire charging current range. This parameter adaptation allows the circuit to achieve both wide adaptability and maintained stability through dynamic parameter optimization.
2Device complexity
If the phase compensation parameter is fixed, then the device complexity is reduced, but the stability across wide current range deteriorates
Solution Approach 1:
Rather than using a complex fixed-parameter design that would require multiple discrete circuits for different operating conditions, the patent employs a dynamic phase compensation parameter that adapts automatically with the charging current. This approach maintains stability across wide current ranges while avoiding the complexity of multiple fixed-parameter circuits, achieving a balance between simplicity and performance through adaptive behavior.
Data Source
AI summary
The present disclosure provides a charging circuit capable of operating stably under a charging current of a wide range. A first transistor is connected between an input terminal and an output terminal. A current setting terminal is connected to an external current setting resistor. A second transistor is connected between the input terminal and the current setting terminal, and has a gate connected to a gate of the first transistor. A constant current feedback circuit feedback-controls a gate voltage of the first transistor in a manner that a voltage of the current setting terminal approaches a reference voltage. The constant current feedback circuit is configured in a manner that a phase compensation parameter is variable according to a current flowing through the first transistor.