Single-phase metering chip anti-tampering neutral missing
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Solution Overview
Problem
Current electric energy metering systems face limitations in preventing electricity theft by neutral missing, as they require complex MCU involvement and high power consumption, making it difficult to integrate advanced manufacturing processes and reduce costs effectively.
Innovation Solution
A single-phase electric energy metering chip with a working mode control circuit, ADC sampling circuit, current effective value measuring circuit, judgment circuit for anti-tampering with neutral missing, and clock circuit, which allows for efficient power management and standalone operation, reducing MCU involvement and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an electric energy metering SOC integrates metering module and MCU on one chip, then the device complexity is reduced, but the manufacturing cost cannot be reduced and adaptability to diversified function demands is limited
Solution Approach 1:
The patent segments the electric energy metering system into two independent parts: a dedicated metering chip handling all metering functions and a separate MCU handling control functions. This segmentation allows each component to be optimized independently, with the metering chip focusing on precise measurement and the MCU on diversified control, thereby resolving the contradiction between device complexity and adaptability.
Solution Approach 2:
The patent extracts the MCU functionality from the integrated SOC and separates it into an independent control unit. This extraction enables the metering chip to专注于 metering tasks while the MCU handles diversified function demands, solving the limitation of integrated designs where both functions compete for resources on a single chip.
2Device complexity
If a more advanced manufacturing process is adopted for the digital part of the MCU to reduce wafer area and cost, then the device complexity and cost are reduced, but the metering accuracy and reliability deteriorate due to the analog nature of the metering part
Solution Approach 1:
The patent segments the system into a metering chip dedicated to analog measurement and a separate MCU for digital control. This segmentation allows the metering chip to use manufacturing processes optimized for analog circuits, ensuring high metering accuracy and reliability, while the MCU can use advanced digital manufacturing processes to reduce cost and complexity.
Solution Approach 2:
The patent applies different manufacturing quality standards to different parts of the system: the metering chip uses high-precision analog manufacturing processes to ensure measurement accuracy, while the MCU uses cost-effective digital manufacturing processes. This local quality approach resolves the contradiction between overall cost reduction and localized precision requirements.
3Use of energy by moving object
If the metering function is integrated into a standalone chip, then the power consumption is reduced and design is simplified, but the functionality is limited compared to integrated SOC solutions
Solution Approach 1:
The patent segments the system into a dedicated metering chip and a separate MCU, allowing the metering chip to be optimized for low power consumption during measurement tasks, while the MCU handles higher-power control functions only when needed. This segmentation resolves the contradiction by allowing each component to operate in its optimal power state.
Solution Approach 2:
The patent implements periodic sampling and measurement cycles where the metering chip operates continuously at low power, and the MCU is activated periodically only when control decisions are needed. This periodic action pattern reduces overall system power consumption while maintaining full functionality, resolving the contradiction between low power consumption and versatile functionality.
Data Source
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AI summary
Provided is a single-phase electric energy metering chip capable of realizing anti-tampering with neutral missing, wherein a working mode control circuit is configured for receiving a control signal sent by a main control chip; an ADC sampling circuit is configured for sampling a current signal to obtain a digital signal; a current effective value measuring circuit is configured for measuring a current effective value; a judgment circuit for anti-tampering with neutral missing is configured for pre-judging the digital signal to judge whether a current loop has a current, and if the current loop has a current, accurately judging the current effective value; and if the current effective value exceeds a threshold of anti-tampering with neutral missing, judging that it is necessary to perform metering of anti-tampering with neutral missing; an electric energy metering circuit is configured for performing energy calculation on the current effective value to obtain an energy pulse; and a clock circuit is configured for providing a clock source for a circuit in the single-phase electric energy metering chip. A metering function of anti-tampering with neutral missing is integrated into the single-phase electric energy metering chip, and a MCU does not participate in electricity stealing prevention metering, thus simplifying the MCU design and reducing power consumption of anti-tampering with neutral missing.