SMPS Controller Mode Switching for Power Saving
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Solution Overview
Problem
Switched mode power supplies (SMPS) face inefficiencies due to high power consumption by controllers, especially under no-load or light-load conditions, which affects their size, efficiency, and temperature management.
Innovation Solution
A controller for SMPS that switches between normal and power-saving modes based on voltage and time criteria, reducing current consumption by adjusting current levels, allowing for efficient operation and quick transitions between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller operates in normal mode to provide active switching of the synchronous rectifier, then the switching performance and reliability are improved, but the power consumption increases
Solution Approach 1:
The controller dynamically switches between normal mode and power-saving mode based on load conditions. The mode selection is determined by monitoring the conduction channel voltage and timing, allowing the system to adapt its current draw to actual operational needs rather than maintaining a fixed high-current state
Solution Approach 2:
The controller changes its operating parameters by switching between two distinct current states: normal-mode current for active switching operations and power-saving-mode current for idle periods. This parameter change is triggered by voltage threshold detection and timing criteria, enabling the system to optimize power consumption while maintaining switching capability when required
2Use of energy by moving object
If the controller reduces current to power-saving mode to save electrical power, then the power consumption is reduced, but the ability to provide active switching is compromised
Solution Approach 1:
The controller monitors voltage and timing parameters in advance to detect when load conditions change. By using a timer to track the duration of voltage thresholds and a voltage comparator to detect conduction channel voltage, the system can anticipate when switching operations will be needed and transition to normal mode proactively, ensuring switching capability is available when required
Solution Approach 2:
The controller uses feedback from voltage monitoring and timing measurements to determine when to switch modes. The voltage comparator continuously monitors the conduction channel voltage, and the timer tracks the duration, providing feedback that triggers mode transitions. This feedback mechanism ensures the controller maintains switching capability under load while saving power during idle periods
3Loss of energy
If the controller frequently changes modes to optimize power consumption, then the energy efficiency is improved, but the system complexity increases
Solution Approach 1:
The control mechanism is segmented into distinct functional components: a voltage comparator for voltage threshold detection, a timer for duration tracking, and a mode selection logic. This segmentation allows each component to perform a specific function with simple circuitry, avoiding the need for complex integrated control while still achieving efficient mode transitions based on voltage and time criteria
Data Source
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AI summary
A controller for a switched mode power supply, wherein the controller is configured to be connected to a synchronous rectifier. The controller comprising: a voltage comparator configured to determine satisfaction of a voltage criterion, wherein the voltage criterion is satisfied when a conduction channel voltage between a first-conduction-channel terminal and a second-conduction-channel terminal meets a first pre-determined voltage threshold; and a timer configured to determine satisfaction of a time criterion, wherein the time criterion is satisfied when a voltage associated with the synchronous rectifier meets a second predetermined voltage threshold for greater than a pre-determined time; the controller configured to provide for a normal mode of operation based on satisfaction of the voltage criterion and a power-saving mode of operation based on satisfaction of the time criterion, wherein the controller is configured to draw a power-saving-mode current in the power-saving mode of operation, and draw a normal-mode current in the normal mode of operation, wherein a magnitude of the normal-mode current is greater than a magnitude of the power-saving-mode current.