Adaptive DC-DC Boost Converter Filtering Capacitor Singing
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Solution Overview
Problem
Existing DC-DC boost converters in electronic devices generate audible noise due to ceramic capacitors vibrating in response to voltage fluctuations, leading to inefficiencies and increased costs when trying to suppress this noise with known solutions.
Innovation Solution
An adaptive DC-DC boost converter arrangement with an acoustical noise suppression filter connected to the control output of the adaptive DC-DC boost control unit and the converter set value input of the DC-DC boost converter, which filters out resonance frequencies causing 'capacitor singing' while maintaining the capability to boost supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If decoupling capacitors are used in DC-DC boost converters to adapt supply voltage, then voltage adaptation efficiency is improved, but audible noise is generated due to capacitor vibration
Solution Approach 1:
The harmful resonance frequencies are extracted and removed from the control signal using a noise suppression filter. The filter identifies and eliminates specific frequency components that cause capacitor vibration, while preserving the useful control signal for voltage adaptation.
Solution Approach 2:
A noise suppression filter is introduced as an intermediary component between the control unit and the DC-DC boost converter. This filter acts as a mediator that modifies the control signal to prevent harmful vibrations while maintaining the desired voltage adaptation function.
2Object-generated harmful factors
If known noise suppression solutions are applied to suppress capacitor noise, then audible noise is reduced, but device complexity and cost increase
Solution Approach 1:
The control unit receives feedback about the operating conditions and dynamically adjusts the control signal to minimize noise. The system monitors the resonance conditions and modifies the drive signal accordingly, enabling noise suppression without adding complex external filtering components.
Solution Approach 2:
The control signal parameters are dynamically changed to avoid resonant frequencies. By adjusting the frequency and amplitude parameters of the control signal based on operating conditions, the system prevents capacitor vibration without requiring additional noise suppression hardware.
3Object-generated harmful factors
If known noise suppression solutions are applied to suppress capacitor noise, then audible noise is reduced, but manufacturing cost increases
Solution Approach 1:
The control unit performs noise suppression functions using its existing processing capabilities. The system uses its own control signal generation and processing resources to identify and eliminate noise-causing frequencies, eliminating the need for additional dedicated noise suppression components and reducing manufacturing costs.
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 effectively suppresses audible noise from ceramic capacitors with low-cost, simple circuitry and minimal dimensions, reducing power consumption and maintaining efficient voltage boosting for high amplifier output power applications.
Implementation Method 1
an acoustical noise suppression filter having a filter input connected to the control output of the adaptive DC-DC boost control unit and a filter output connected to the converter set value input of the DC-DC boost converter
Data Source
AI summary
An adaptive DC-DC boost converter arrangement and an electronic circuit including such an arrangement are provided. The arrangement includes a circuit board with a plurality of electronic components mounted thereon, implementing an adaptive DC-DC boost converter circuit and a boost decoupling capacitor. The adaptive DC-DC boost converter circuit comprises a DC-DC boost converter having a converter set value input, a boost supply input, and a boost voltage output, and an adaptive DC-DC boost control unit having a control input and a control output. An acoustical noise suppression filter is present having a filter input connected to the control output of the adaptive DC-DC boost control unit and a filter output connected to the converter set value input of the DC-DC boost converter.