Compact Electrical Meter Layout With Galvanic Isolation
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Solution Overview
Problem
Existing measuring devices for electrical quantities face challenges in achieving a compact design while meeting safety and cost-effective requirements, particularly when used in limited spatial conditions and under various regulatory standards.
Innovation Solution
A measuring device with a compact configuration, featuring a housing with offset circuit boards and a latching mechanism, includes a voltage divider and galvanic isolation to ensure safe and efficient electrical quantity measurement, using modular current transformers and a two-part latching housing with a formed component to prevent disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components are arranged on a circuit board to implement measuring functionality, then the device can perform electrical quantity measurement, but the device occupies significant space and lacks compactness
Solution Approach 1:
The device is divided into two separate circuit boards: a measuring circuit board containing voltage connection, voltage divider, CT connections, and measuring chip; and a communication circuit board containing data communication chip and communication interfaces. These boards are arranged offset on top of each other and connected via plug connector, reducing overall device volume while maintaining full measuring functionality.
Solution Approach 2:
The two circuit boards are arranged in a vertical offset configuration rather than horizontal placement, utilizing the vertical dimension to pack components more densely. This three-dimensional arrangement reduces the horizontal footprint and overall device volume.
2Reliability
If galvanic isolation is provided between measuring chip and data communication chip, then safety requirements are fulfilled, but device complexity increases
Solution Approach 1:
Galvanic isolation is achieved by separating the measuring circuit board and communication circuit board into distinct electrical domains. The measuring chip on the first board operates electrically isolated from the data communication chip on the second board, with connections made through physically separated plug connectors, thereby fulfilling safety requirements while managing complexity through modular design.
3Ease of operation
If a two-part latching housing is used with latching hooks, then the housing can be easily assembled and disassembled, but the latching connection may accidentally disengage
Solution Approach 1:
A formed component is introduced as a blocking element that preemptively prevents accidental disengagement of the latching connection. This component is arranged in the assembled state to block the movement of latching hooks, thereby cushioning against potential failure modes before they can occur.
Solution Approach 2:
The formed component acts as an intermediary element between the latching hooks and the housing walls. It mediates the latching connection by providing additional mechanical support and preventing direct disengagement, thereby enhancing reliability without compromising ease of assembly.
4Volume of moving object
If the device is designed for compact configuration, then space requirements are minimized, but manufacturing and assembly become more difficult
Solution Approach 1:
The device is segmented into two separate circuit boards that can be manufactured independently using standard PCB fabrication processes. This segmentation allows each board to be manufactured and tested separately, simplifying the overall manufacturing process despite the compact final assembly. The offset vertical arrangement further facilitates separate handling and assembly.
Data Source
AI summary
A measuring device for has a housing, a measuring circuit board, and a communication circuit board. The measuring circuit board has a voltage connection, a voltage divider, a CT connection for connecting an external current transformer, a measuring chip connected to the voltage divider and the CT connection for determining electrical quantities and outputting as measurement data to a first part of a plug connector. The communication circuit board is connected to a second part of the plug connector, which together with the first part connects the communication circuit board and the measuring circuit board, a data communication chip connected to the second part and electrically isolated to receive the measurement data from the measuring chip, where a galvanic isolation between the measuring chip and the data communication chip is provided on the communication circuit board, a data connection connected to the data communication chip and a user interface.