Boost Converter Ripple Reduction via Dynamic Voltage Threshold
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Solution Overview
Problem
Conventional boost-type switching regulators face challenges in reducing ripple in the output voltage while maintaining the desired voltage level, particularly when using a fixed duty method, which can lead to insufficient charge transfer and excessive inductor current, triggering overcurrent protection and increasing ripple.
Innovation Solution
The boost-type switching regulator incorporates a detection voltage generating unit, an output voltage controlling unit, and a detection voltage level shifting unit to adjust the detection voltage levels during voltage increasing and decreasing periods, ensuring sufficient off-periods for the switching element and optimizing charge transfer, thereby reducing ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed duty method is used to reduce circuit size, then device complexity is reduced, but output voltage ripple increases due to insufficient off-periods and excessive inductor current
Solution Approach 1:
The patent applies dynamics by making the detection voltage threshold variable rather than fixed. The detection voltage level shifting unit dynamically adjusts the threshold based on the switching element's on-period duration. When the on-period is long, the threshold is lowered to ensure sufficient off-periods for ripple reduction; when the on-period is short, the threshold is raised to maintain adequate charge transfer. This dynamic adjustment resolves the contradiction between fixed-duty simplicity and ripple control.
Solution Approach 2:
The patent changes the parameter of detection voltage threshold adaptively. The detection voltage level shifting unit modifies the threshold parameter based on real-time switching element operation characteristics (on-period length). This parameter change enables the system to optimize between two opposing requirements: sufficient off-periods for ripple reduction and adequate charge transfer for voltage maintenance, without increasing overall circuit complexity.
2Object-generated harmful factors
If the off-period is extended to reduce ripple, then output voltage ripple is reduced, but charge transfer becomes insufficient and output voltage level drops
Solution Approach 1:
The patent uses dynamics to adaptively adjust the detection voltage threshold based on the switching element's on-period. When the on-period is sufficiently long, the threshold is lowered to allow extended off-periods for ripple reduction. When the on-period is short, the threshold is raised to ensure adequate charge transfer maintains output voltage level. This dynamic adaptation resolves the contradiction between ripple reduction and voltage level maintenance.
Solution Approach 2:
The patent changes the detection voltage threshold parameter adaptively based on switching element operation characteristics. By modifying this parameter, the system optimizes the balance between off-period duration (for ripple reduction) and charge transfer adequacy (for voltage level maintenance), preventing both excessive ripple and voltage droop.
3Object-generated harmful factors
If the detection voltage threshold is lowered to ensure sufficient off-periods, then ripple is reduced, but charge transfer becomes insufficient and overcurrent protection activates
Solution Approach 1:
The patent applies dynamics by making the detection voltage threshold variable based on on-period length. The level shifting unit lowers the threshold only when the on-period is sufficiently long, ensuring both ripple reduction and adequate charge transfer. When the on-period is short, the threshold remains high to prevent overcurrent protection activation. This dynamic adjustment resolves the contradiction between ripple control and overcurrent prevention.
Solution Approach 2:
The patent changes the detection voltage threshold parameter adaptively based on switching element on-period characteristics. This parameter modification ensures that the threshold is lowered only under conditions where sufficient charge transfer can occur, thereby reducing ripple while preventing overcurrent protection activation.
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 configuration effectively reduces output voltage ripple by adjusting detection voltage levels, ensuring efficient energy transfer and preventing overcurrent protection activation, thus maintaining a stable output voltage.
Implementation Method 1
a boost-type DC-DC converter (a boost converter) using a chopper method... an inductor (a choke coil)... the boost-type DC-DC converter is configured to obtain a direct current having a required voltage through combining the pulse electrical current
Implementation Method 2
a switching element of the boost-type DC-DC converter divides the direct current into a pulse electrical current
Implementation Method 3
a capacitor... to reduce the ripple generated in the output voltage
Data Source
AI summary
A boost-type switching regulator includes an inductor; a rectifying element; a capacitor; a switching element; an output terminal; a detection voltage generating unit; an output voltage controlling unit; and a detection voltage level shifting unit. The detection voltage generating unit generates a detection voltage according to an output voltage. The output voltage controlling unit turns on and off the switching element to increase the output voltage when the detection voltage is smaller than a specific value, and to turn off the switching element to decrease the output voltage when the detection voltage is greater than the specific value. The detection voltage level shifting unit shifts the detection voltage so that the detection voltage during a voltage increasing period becomes greater than the detection voltage during a voltage decreasing period.