Buck-Boost Regulator Bypass for Switching Loss Reduction
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Solution Overview
Problem
Existing buck-boost regulators continue to switch and incur significant switching losses when the input voltage is near the desired output voltage, wasting energy and reducing the lifespan of power supplies in electronic devices.
Innovation Solution
A regulator apparatus with a boost controller and a buck controller that share a common inductor, using threshold voltages to minimize switching when the output voltage is near the desired level, and employing a bypass switch to directly couple the input voltage to the output when within a defined dead band, reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buck-boost regulator continuously switches to regulate voltage when input voltage is near the desired output voltage, then voltage regulation is maintained, but significant switching losses occur wasting energy
Solution Approach 1:
The patent extracts the switching operation from the continuous regulation process by introducing a bypass path that directly connects input and output when voltage regulation is not needed. This separates the switching function from the bypass function, allowing the system to eliminate unnecessary switching losses while maintaining voltage regulation stability through selective engagement of the bypass path.
Solution Approach 2:
The patent changes the operational parameter by introducing a dead band voltage range where switching is intentionally suppressed. When the output voltage falls within this dead band, the regulator transitions from active switching mode to bypass mode, changing the system's operational state to eliminate switching losses while maintaining acceptable voltage regulation.
2Loss of energy
If a bypass switch is introduced to reduce switching losses, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the bypass switch with the existing regulator circuitry, integrating the additional functionality into the current architectural framework. The bypass switch is controlled by the existing control logic that monitors output voltage, combining the voltage regulation function with the bypass function in a unified control scheme rather than adding entirely separate control systems.
Solution Approach 2:
The bypass switch serves multiple functions: it reduces switching losses during normal operation, provides a direct power path for high-current applications, and extends battery life by minimizing energy dissipation. This multi-functionality justifies the added complexity by delivering multiple benefits from a single additional component.
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
The solution efficiently regulates voltage with minimal switching losses, extending the life of power supplies by maintaining a stable output voltage with reduced energy wastage, even when the input voltage is near the desired output voltage.
Implementation Method 1
a regulator having a boost controller configured to provide voltage to an output of the regulator when at least one of the output voltage or the input voltage is below a first threshold voltage and a buck controller configured to provide voltage to the output of the regulator when at least one of the output voltage or the input voltage is above a second threshold voltage
Data Source
AI summary
This document provides methods and apparatus configured to efficiently regulate an output voltage near a desired voltage level, for example, under varying input or load conditions. An example apparatus can include a regulator having a boost controller configured to provide voltage to an output of the regulator when at least one of the output voltage or the input voltage is below a first threshold voltage and a buck controller configured to provide voltage to the output of the regulator when at least one of the output voltage or the input voltage is above a second threshold voltage. Further, the regulator can be configured to provide the input voltage at the output of the regulator when at least one of the input voltage or the output voltage is between the first and second threshold voltages. In some examples, the first threshold is below the second threshold.