An integrated circuit board for a single-phase guide rail meter

Abstract

The invention relates to an integrated circuit board of a single-phase guide rail meter, and belongs to the technical field of preparation of a circuit board of an energy meter. The integrated circuit board mainly structurally comprises a circuit board substrate, a manganin shunt, a null line connecting plate and a strainer-type terminal base, wherein the manganin shunt is fixedly welded at the lower left end of the circuit board substrate to realize connection of live wire power and sampling of current signals; the null line connecting plate is fixedly welded at the lower right end of the circuit board substrate to realize connection of null line power and form the integrated circuit board; red copper sheets of the manganin shunt and the null line connecting plate on the integrated circuit board are respectively inserted in jacks of the strainer-type terminal base to realize assembly of the integrated circuit board. The integrated circuit board is simple in production process, high in automation degree, production efficiency and product reliability, low in reject ratio, welding pollution, operational risk and cost, good in product consistency and high in precision stability.

Description

Technical field: [0001] The invention belongs to the technical field of circuit board preparation for electric energy meters, and relates to an integrated circuit board, in particular to an integrated circuit board for a single-phase guide rail meter. The connection method is soldered on the circuit board to form an integrated connection. Background technique: [0002] The electric energy meter is an instrument used to measure electric energy. As a metering product, it has very high requirements on its own stability and reliability. It needs to be strictly controlled from design to production process to avoid product stability caused by design or process differences. Changes; at present, the current signal sampling of the manganese-copper shunt of the electric energy meter and the power supply are mainly connected by a wire harness. In the production process, it is manually welded to the corresponding position of the circuit board. The disadvantage is that the production pro...

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Problems solved by technology

[0002] The electric energy meter is an instrument used to measure electric energy. As a metering product, it has very high requirements on its own stability and reliability. It needs to be strictly controlled from design to production process to avoid product stability caused by design or process differences. Changes; at present, the current signal sampling of the manganese-copper shunt of the electric energy meter and the power supply are mainly connected by a wire harness. In the production process, it is manually welded to the corresponding position of the circuit board. The disadvantage is that the production process is complex, the degree of automation is low, and the process defect rate High, low product reliability, and poor stability of ammeter accuracy; since the current sampling signal generally ranges from a few millivolts to tens of millivolts, the signal is small and easily interfered by external noise. If the wiring harness is too long, the interference noise introduced will be more Large, but current sampling and power supply generally require at least 4 wire harnesses, which need to be welded to different positions on the circuit board. In the mass production of the existing technology, on the one hand, manual operation is likely to cause misalignment of the wire harness welding, and on the other hand, the wire harness conducts heat. The speed is fast, if the temperature of the soldering iron and the soldering time are not properly controlled, it will often cause solder joints to be virtual, so that there are many tiny air bubbles inside the solder joints, which are difficult to detect during the production inspection process, but the solder joints will gradually oxidize during the long-term operation It will lead to current signal sampling errors, and problems such as precision drift and creep in the electric meter; secondly, the manganese-copper shunt of the traditional electric energy meter and the connecting piece of the neutral line are fixed on the terminal of the electric energy meter by screws. In the electric energy meter, the current of the live line and the neutral line at the end of the electric energy meter will reach tens to hundreds of amperes or even thousands of amperes. It often causes the terminals at the end of the electric energy meter to melt and even cause a fire; thirdly, as the problems of high production costs and labor difficulties in China's manufacturing industry become increasingly prominent, improving the automation of product production has become an important means to reduce production costs and improve market competitiveness , so seek to design and provide an integrated circuit board for a single-phase rail meter, change the traditional manual welding of manganese-copper sampling harness and power harness, and the manual screw fixing of manganese-copper shunt and zero line connecting piece, which has good application Benefits and practical value

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