Switch Mode Power Supply Controller Off-Mode Feedback Pin
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Solution Overview
Problem
Current switch mode power supply controllers are unable to implement an off-mode without requiring additional pins, which complicates their integration into existing systems and hinders efficient power management, especially when there is no load, leading to inefficiencies in voltage regulation.
Innovation Solution
A method to integrate an off-mode into switch mode power supply controllers using a feedback pin or feedback node, allowing the system to drop the output voltage outside a predetermined range without additional pins, enabling rapid re-regulation when a load is detected, by employing a Feedback Control circuit that manages energy transfer through existing pin configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an off-mode is implemented in a power controller, then power consumption during no-load conditions is minimized, but additional pins are required which complicates integration into existing systems
Solution Approach 1:
The feedback pin is made multi-functional by enabling it to detect both regulation mode conditions and off-mode conditions. The pin universally handles voltage level detection for different operating modes without requiring dedicated pins for each mode, thus achieving off-mode capability while maintaining compatibility with existing pin configurations.
Solution Approach 2:
The system transitions between operating modes by detecting changes in voltage parameters at the feedback pin. Different voltage levels indicate different modes (regulation vs. off-mode), allowing the controller to switch functions based on parameter changes rather than requiring separate control pins for each mode.
2Stability of the object's composition
If regulation is maintained continuously, then output voltage remains within the predetermined range, but power consumption increases during no-load conditions
Solution Approach 1:
The power supply system dynamically switches between regulation mode and off-mode based on load conditions. During no-load conditions, the system transitions to off-mode to reduce power consumption, while automatically returning to regulation mode when load is detected, thus adapting its behavior to optimize both energy efficiency and voltage stability.
Solution Approach 2:
The feedback pin continuously monitors voltage levels and provides information to the controller about load conditions. This feedback mechanism enables the system to detect when no load is present and switch to off-mode, and to detect when load is reapplied and return to regulation mode, thus using feedback to optimize the trade-off between voltage stability and power consumption.
3Loss of energy
If the output voltage is allowed to drop outside the predetermined range during off-mode, then power consumption is reduced, but the system must quickly re-regulate when load is detected
Solution Approach 1:
The controller maintains the capability to quickly transition from off-mode to regulation mode by keeping the feedback detection circuitry active and ready. When load is detected through the feedback pin, the system can immediately initiate regulation without requiring extensive re-initialization, thus preparing in advance for rapid mode switching.
Data Source
AI summary
At least one embodiment is directed to a semiconductor voltage controller comprising: a start-mode circuit associated with a start-mode; and an off-mode circuit associated with an off-mode, where the voltage controller can be configured to receive a feedback signal and an off-mode signal from a single input and provide an output voltage, where the voltage controller can be configured to be in the off-mode when the feedback signal is less than a skip level and the feedback signal is less than a HV control level, and where the voltage controller can be configured to be in start mode when the feedback signal is greater than HV control level and Vcc is below a Vcc-start.