DC-to-DC Voltage Converter With Switching Frequency Detection
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Solution Overview
Problem
Conventional DC-to-DC voltage converters face challenges in stabilizing output voltage and switching frequency, leading to issues with electromagnetic interference (EMI) and system performance degradation due to varying switching frequencies, especially under changing input and output conditions.
Innovation Solution
A DC-to-DC voltage converter that utilizes switching frequency detection to control the duty cycle of the power driving signal, incorporating a setting clock generation unit, on-time control unit, and driving control unit to maintain a stable switching frequency and output voltage, thereby preventing frequency variations and EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional nonlinear control methods are used, then response speed is improved, but switching frequency varies causing EMI and system performance degradation
Solution Approach 1:
The patent implements a feedback mechanism where the switching frequency is detected and used to control the duty cycle. The controller adjusts the duty cycle based on the detected switching frequency to maintain a target switching frequency, thereby stabilizing the switching frequency while preserving the fast response characteristics of nonlinear control methods.
Solution Approach 2:
The patent changes the control parameter from direct voltage control to duty cycle control based on switching frequency detection. By detecting the switching frequency and adjusting the duty cycle accordingly, the system maintains stable switching frequency while achieving fast response to load changes.
2Device complexity
If voltage mode control is used, then circuit complexity is reduced, but response speed decreases leading to voltage drop under load changes
Solution Approach 1:
The patent replaces the need for complex current sensing circuits with a switching frequency detection mechanism. Instead of using current mode control that requires complicated sensing circuits, the system detects switching frequency and controls duty cycle, achieving fast response with simpler circuitry.
3Speed
If current mode control is used, then response speed is improved, but circuit complexity increases due to required current sensing circuits
Solution Approach 1:
The patent replaces current sensing circuits with a switching frequency detection mechanism. Instead of measuring current to control the switching, the system detects the switching frequency and adjusts the duty cycle accordingly, achieving fast response with reduced circuit complexity.
Data Source
AI summary
A DC-to-DC voltage converter using switching frequency detection is provided. The DC-to-DC voltage converter includes a voltage conversion block including a power switch configured to be turned on in response to a power driving signal and to provide an input supply voltage to be output as the converted output voltage when the power switch is turned on, wherein the converted output voltage has a level that varies depending on a duty cycle of the power driving signal, and a switching control block that receives the converted output voltage and a feedback signal to control the duty cycle of the power driving signal based on a frequency of a feedback signal, the feedback signal having the same period as the power driving signal. Accordingly, when the level of the input supply voltage is changed, the converted output voltage can be recovered to the target level while the switching frequency of the power driving signal is maintained at the same value as before the change of the level of the input supply voltage. Electronic devices adopting the DC-to-DC voltage converter can be strong against an electromagnetic interference phenomenon and have improved performance in a low frequency band.