Electricity Meter Synchronous Modulation for DC Measurement
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Solution Overview
Problem
Existing ac electricity meters perform poorly when measuring dc power, and there is a lack of developed dc electricity meter technology suitable for widespread deployment.
Innovation Solution
An electricity meter is designed with a converter that synchronously modulates current and voltage measurement signals, allowing for accurate measurement of both dc and ac power. The meter includes a measurement module that processes these signals to determine power and other measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing ac electricity meters are used to measure dc power, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by modulating the DC measurement signals at a specific frequency (e.g., 131 Hz) to transform them into AC signals that can be accurately processed by existing AC meter measurement modules. This frequency modulation allows the AC meter's measurement circuitry to operate in its optimal frequency range, thereby achieving high measurement precision for DC power without requiring a completely different DC-specific measurement system.
2Measurement precision
If dc electricity meter technology is developed for accurate measurement, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent implements universality by designing a measurement system that can handle both AC and DC power measurements using the same measurement module. The converter module modulates DC signals into AC-compatible frequency ranges, allowing a single multi-functional device to accurately measure both AC and DC power, thereby avoiding the need for separate specialized DC metering systems.
Solution Approach 2:
The converter acts as an intermediary between the DC measurement signals and the AC-optimized measurement module. It transforms DC signals into modulated AC signals that bridge the gap between DC power input and AC measurement capabilities, enabling accurate DC measurement through AC measurement infrastructure without direct complex DC measurement circuitry.
3Measurement precision
If synchronous modulation is applied to current and voltage signals, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent merges the modulation function with the existing measurement module by integrating the converter and measurement module into a unified system. The synchronous modulation of current and voltage signals is performed within the same integrated circuit architecture, combining signal conditioning and measurement functions to achieve high precision while minimizing the increase in overall device complexity through consolidation.
Data Source
AI summary
An electricity meter includes a converter configured to synchronously modulate current and voltage measurement signals and output synchronously-modulated current and voltage measurement signals and also includes a measurement module configured to receive the synchronously-modulated current and voltage measurement signals from the converter and to process the synchronously-modulated current and voltage measurement signals.