Power Supply Line Current Regulation Feedback
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Solution Overview
Problem
Conventional line current regulation methods operate under open-loop conditions, making it difficult to set a reference value, and require additional components like resistors or subsidiary coils to sense output currents.
Innovation Solution
A power supply system that regulates line current by comparing a reference voltage with a line sensing voltage to generate a feedback voltage, controlling the switching operation of a power switch using this feedback, and senses output current without additional resistors or coils by utilizing the voltage between inductor terminals and switching cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional open-loop line current regulation method is used, then the control is simple, but it is difficult to set the reference value and regulate line current precisely
Solution Approach 1:
The patent implements a feedback mechanism where the output current is sensed and fed back to the control circuit. The controller adjusts the duty cycle of the power switch based on the feedback signal to maintain the line current at the desired level. This closed-loop control enables precise reference value setting and line current regulation, resolving the contradiction between regulation precision and control simplicity.
2Measurement precision
If additional resistors or subsidiary coils are used to sense output current, then the output current information can be obtained, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing inductor serve multiple functions: it acts as both the power transfer element and the sensing element for output current. By detecting the voltage across the inductor terminals and analyzing the switching cycle characteristics, the controller can determine the output current without requiring separate sensing components. This multi-functional approach eliminates additional resistors or subsidiary coils while maintaining sensing capability.
3Loss of information
If additional sensing components are added to the power supply, then the output current can be monitored, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent enables the power supply system to sense its own output current using existing components. The controller monitors the voltage across the inductor and the switching cycle duration to calculate the output current internally. This self-service approach eliminates the need for external sensing components, simplifying manufacturing and reducing costs while ensuring output current information is available for regulation purposes.
Data Source
AI summary
Provided is regulation of a line current. The regulation of the line current includes comparing a reference voltage with a line sensing voltage to generate a feedback voltage, and controlling a switching operation of a power switch using the feedback voltage. The reference voltage may be a voltage having a constant level, a voltage which varies according to an output current, or a voltage which follows a sine wave to compensate a power factor. Provided is sensing of an output current. The sensing of the output current includes sensing the output current using a feedback voltage corresponding to a voltage between both terminals of an inductor connected to a power switch, a peak of current flowing through the power switch, and a switching cycle of the power switch.