Power Supply Circuit With Feedback Charging Current Control
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Solution Overview
Problem
Existing power supply circuits lack accurate sensing and control of charging current during capacitor charging, which is crucial for maintaining uninterrupted power supply and efficient system operation.
Innovation Solution
A power supply circuit design incorporating a current sense circuit with a current sense transistor and a current control circuit with a current control transistor, along with a switch circuit, allows for precise control of charging current through different operational modes (pre-charge and switch-charge) by adjusting the switches and transistors' states based on voltage thresholds, ensuring accurate charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a storage capacitor is used to provide backup power, then uninterrupted power supply is achieved, but accurate sensing and control of charging current becomes difficult
Solution Approach 1:
The patent introduces a current sense transistor as an intermediary component between the charging path and the control circuit. This transistor senses the charging current flowing to the storage capacitor and converts it into a measurable signal, enabling accurate monitoring without directly interfering with the power supply function. The sense transistor acts as a mediator that bridges the power delivery path and the control path.
Solution Approach 2:
The patent implements a feedback control mechanism where the current sense transistor continuously monitors the charging current and feeds this information back to a control circuit. The control circuit adjusts the charging current based on the feedback signal, ensuring accurate control while maintaining uninterrupted power supply. This closed-loop feedback system resolves the contradiction by enabling precise measurement and control without compromising reliability.
2Productivity
If charging current is increased to charge storage capacitor faster, then charging speed is improved, but control precision of charging current decreases
Solution Approach 1:
The patent employs dynamic control of the charging current through a control circuit that adjusts the current based on real-time conditions. The system can operate in different modes (pre-charge mode and switch-charge mode) with dynamically adjusted current levels, allowing fast charging when conditions permit while maintaining precision control through continuous monitoring and adjustment by the control circuit.
Data Source
AI summary
A power supply circuit that may be operated in a pre-charge mode or a switch-charge mode to provide a charging current. In the pre-charge mode, a current sense transistor of the power supply circuit may be operating to sense the charging current and to provide a current sense signal indicative of the charging current, while a current control transistor of the power supply circuit may be operating to control the charging current based on the current sense signal.