Digital Low-Pass Filter for AC/DC Driver Integration
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Solution Overview
Problem
Conventional low-pass filters in AC/DC electronic devices face integration challenges due to their high capacitance, leading to increased size and instability in driver circuits, making them unsuitable for integration with integrated circuits or chips.
Innovation Solution
A low-pass filter and switching control circuit that utilize a differential-integral module and digital-to-analog conversion module to generate and process differential-integral signals, allowing for integration within chips or on PCBs, and a control unit to manage switch-on time periods, enabling stable power supply to DC loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional low-pass filters with high capacitance are used to achieve smoother DC output, then filtering capability is improved, but device size and complexity increase making integration difficult
Solution Approach 1:
The patent changes the fundamental parameters of the low-pass filter by replacing high-capacitance analog components with a digital counter and register system. The filtering function is achieved through digital counting operations rather than analog RC time constants, enabling integration into ICs while maintaining effective filtering capability.
Solution Approach 2:
The patent substitutes the mechanical/electrical analog filtering system (capacitors, resistors) with a digital system (counter, register, logic circuits). This replacement eliminates the need for large physical components while achieving the same filtering effect through digital signal processing.
2Reliability
If high capacitance filtering capacitors are used to suppress voltage pulsations, then voltage ripple is reduced, but the physical size of the circuit increases
Solution Approach 1:
The patent changes the approach to voltage stabilization by using digital counting to measure and filter voltage ripple characteristics rather than using large analog capacitors. The counter accumulates pulse signals representing voltage variations, and the register stores the filtered result, achieving voltage stabilization without large physical components.
Solution Approach 2:
The patent creates a digital copy or representation of the voltage signal through pulse counting, rather than directly manipulating the analog voltage with large capacitors. The counter captures the essential characteristics of voltage pulsations in digital form, allowing filtering through digital operations on this copied representation.
3Device complexity
If conventional low-pass filters are integrated into chips, then device integration is improved, but filtering performance deteriorates due to space constraints
Solution Approach 1:
The patent replaces the space-consuming analog filtering components with digital logic circuits that can be densely integrated into ICs. The counter and register occupy minimal chip area compared to high-capacitance components, yet maintain effective filtering performance through digital signal processing operations.
Solution Approach 2:
The patent changes the filtering mechanism from analog time-constant-based filtering to digital sampling and counting-based filtering. This parameter change allows the filter to achieve effective ripple suppression with much smaller on-chip components, as the filtering effect is derived from the counting and averaging operations rather than physical capacitor size.
Data Source
AI summary
A low-pass filter, a switching control circuit, a driving system, a chip and methods are disclosed. The low-pass filter performs digital differential-integral process on a voltage of an acquired analog signal and a predefined reference voltage to generate differential-integral signals, accumulates a count of the differential-integral signals, and convert the result to an analog signal. By performing differential-integral process accumulating a count of the differential-integral signals, a low-pass filtered signal is obtained in a way that solves the problem of low integrity of circuits in conventional driving systems, reduces the complexity of external circuits for such driving systems and increases their circuit stability.