Power Supply IC Mode Transition Using Segmented Detection Voltage
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Solution Overview
Problem
Existing integrated circuits for power supply circuits face challenges in appropriately operating between normal and light load modes due to delayed transitions and efficiency deterioration when the predetermined detection voltage level is set too high or too low, leading to suboptimal power supply performance across various modes.
Innovation Solution
An integrated circuit with a load detection circuit, driver circuit, and control circuit that adjusts the operation mode based on detection voltage levels, switching between normal and light load modes by using two reference voltage levels to ensure timely and efficient mode transitions, thereby maintaining output voltage stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the predetermined detection voltage level is set high, then the light load mode can be maintained longer, but the change from light load mode to normal mode is delayed and output voltage drops
Solution Approach 1:
The detection voltage reference is segmented into two distinct levels: a first reference voltage for transitioning from normal mode to light load mode, and a second reference voltage for transitioning from light load mode to normal mode. This segmentation allows optimized thresholds for each transition direction, resolving the contradiction between maintaining efficiency and ensuring rapid response.
2Speed
If the predetermined detection voltage level is set low, then the response to load increase is faster, but the change from normal mode to light load mode is delayed and efficiency deteriorates
Solution Approach 1:
The detection voltage reference is segmented into two distinct levels: a first reference voltage for transitioning from normal mode to light load mode, and a second reference voltage for transitioning from light load mode to normal mode. This segmentation allows optimized thresholds for each transition direction, resolving the contradiction between maintaining efficiency and ensuring rapid response.
3Device complexity
If a single predetermined detection voltage level is used, then the control circuit is simple, but the power supply circuit cannot appropriately operate between multiple modes
Solution Approach 1:
The detection voltage reference is segmented into two distinct levels: a first reference voltage for transitioning from normal mode to light load mode, and a second reference voltage for transitioning from light load mode to normal mode. This segmentation allows optimized thresholds for each transition direction, resolving the contradiction between maintaining efficiency and ensuring rapid response.
Solution Approach 2:
The control circuit dynamically switches between two reference voltage levels based on the current operation mode. When in normal mode, it uses the first reference voltage; when in light load mode, it uses the second reference voltage. This dynamic adaptation enables the system to appropriately respond to different operating conditions while maintaining reasonable circuit complexity.
Data Source
AI summary
An integrated circuit for a power supply circuit configured to generate an output voltage at a target level. The power supply circuit includes a transistor configured to control an inductor current flowing through an inductor. The integrated circuit includes a load detection circuit outputting a detection voltage corresponding to a power consumption of a load and corresponding to an operation mode of the power supply circuit, based on the inductor current, a driver circuit driving the transistor according to the operation mode of the power supply circuit, and a control circuit configured to control the driver circuit to switch the power supply circuit to a second mode upon the detection voltage reaching a first level with a decrease in the power consumption of the load, and to a first mode upon the detection voltage reaching a second level with an increase in the power consumption of the load.