Switching Regulator Power Saver Circuit for Idle Mode Efficiency
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Solution Overview
Problem
Switched mode power supplies face challenges in efficiently managing varying power levels across different modes of operation, leading to increased size, complexity, and power losses due to multiple inductors and frequent switching cycles.
Innovation Solution
A voltage regulator with a pulse width modulation (PWM) controller and a power saver circuit that reduces the PWM control signal rate during idle modes, using a single inductor optimized for medium load conditions, and logic circuitry to enable the switching element at a lower rate, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple inductors are used to provide different power levels, then the power supply can meet varying load requirements, but the size of the power supply increases
Solution Approach 1:
A single inductor is designed to perform multiple functions by operating in different modes (continuous conduction mode and discontinuous conduction mode) to provide different power levels. The inductor serves both high-power and low-power requirements through mode switching controlled by the power saver circuit, eliminating the need for separate inductors for different power levels.
Solution Approach 2:
The power supply dynamically switches between continuous conduction mode and discontinuous conduction mode based on load conditions. The power saver circuit monitors load requirements and dynamically adjusts the operating mode of the single inductor, allowing it to adapt its behavior rather than requiring static multiple inductors for different power levels.
2Adaptability or versatility
If multiple inductors are switched into or out of the power supply, then multiple power levels are provided, but the complexity of the power supply increases
Solution Approach 1:
The single inductor performs multiple power delivery functions through mode switching, eliminating the need for multiple inductor switching mechanisms. The power saver circuit provides unified control for both continuous and discontinuous conduction modes, reducing the complexity of switching control compared to managing multiple inductors.
Solution Approach 2:
The system uses dynamic mode switching between continuous and discontinuous conduction modes rather than static multiple inductor configurations. The power saver circuit dynamically determines the appropriate mode based on load conditions, simplifying the control architecture compared to managing multiple inductor switches.
3Adaptability or versatility
If additional switching cycles are performed, then multiple power levels are achieved, but power losses increase
Solution Approach 1:
The power saver circuit implements periodic action by switching between continuous and discontinuous conduction modes based on load requirements. In discontinuous mode, the inductor is switched off during idle periods, reducing the frequency of switching cycles and thereby reducing switching power losses while still maintaining the ability to provide different power levels when needed.
Solution Approach 2:
The power saver circuit extracts and removes unnecessary switching cycles during low-power modes. By transitioning to discontinuous conduction mode, the system eliminates redundant switching operations that would occur in continuous mode, thereby reducing switching losses while maintaining power level adaptability through mode selection.
4Speed
If the switching element is kept active at high rate, then power delivery responsiveness is maintained, but power consumption increases in idle modes
Solution Approach 1:
The switching element dynamically adjusts its activity rate based on load conditions. In continuous conduction mode, the switching element operates at high rate for rapid power delivery. In discontinuous conduction mode during idle periods, the switching element operates at reduced rate or remains off, reducing power consumption while maintaining the capability to respond quickly when power is needed.
Solution Approach 2:
The power saver circuit implements periodic activation of the switching element based on power requirements. During idle modes, the switching element is activated periodically at a reduced rate rather than continuously, reducing power consumption while maintaining responsiveness. When power is needed, the switching element returns to high-rate operation for rapid power delivery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces power losses and improves efficiency by minimizing the active on-time of the switching element and frequency of switching in low load modes, while maintaining efficient power delivery across varying power requirements.
Implementation Method 1
When the switching transistor is on, a voltage is provided to charge an inductive mechanism in the power supply such as one or more inductors or coils of a transformer. When the drive signal is switched off, the inductive mechanism discharges to provide the desired voltage.
Data Source
AI summary
In one embodiment, the present invention includes a regulator having a pulse width modulation (PWM) controller to generate a PWM control signal based on a voltage level of a load coupled to the regulator, a driver to provide a drive signal to a switching element of the regulator responsive to the PWM control signal, and a power saver coupled between the PWM controller and the driver to receive the PWM control signal and to output the PWM control signal to the driver at a reduced rate during an idle mode of the load.