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Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter

A technology of SPI bus and electric energy metering, which is applied in the direction of measuring electric variables, voltage/current isolation, measuring devices, etc., can solve the problems that the safety and reliability of electric meters cannot be guaranteed, and improve the safety and reliability of use, and improve Maintainability and the effect of simplifying the production process

Active Publication Date: 2013-04-03
郭建国 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] An object of the present invention is to integrate the electric energy metering circuit of each phase and the micro-processing circuit etc. During the adjustment, inspection and maintenance of the ammeter, due to the high voltage of each phase and line, the safety and reliability of the ammeter in the process of production and use cannot be guaranteed. Provide a high-precision meter that can perform phase currents greater than 50A or more. Single-phase isolated SPI bus energy metering module with strong anti-electromagnetic interference capability

Method used

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  • Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter
  • Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter
  • Isolated serial peripheral interface (SPI) bus electric energy measuring module and APLC electricity meter

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Experimental program
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Effect test

Embodiment 1

[0043] Refer to attached image 3 as shown, image 3 It is the circuit schematic diagram of the single-phase isolated SPI bus electric energy metering module of the present invention, which is mainly composed of a small high-voltage isolated voltage mutual induction transformer T, a resistance bridge RE, an electric metering chip U1, a three-terminal voltage regulator U2, an optical coupler IC1...IC9, and a shunt Composed of device Rg, diode D1...D4, LED, crystal oscillator Y, capacitor C1...C21, resistor R1...R21, inductor L1 and L2, varistor RW, transient voltage suppressor DW, resistor RW1 and RW2; The metering chip U1 is an electric metering chip with SPI bus (different from ADE7755 series chips without SPI bus). Devices IC1...IC9 and the isolation voltage mutual induction transformer T, the isolation voltage is greater than 4000VDC.

[0044] In the circuit block diagram of the isolated SPI bus power metering module, the anti-strong instantaneous overvoltage power input ...

Embodiment 2

[0046] like Pic 4-1 , as shown in 4-2 and 4-3, the isolated SPI bus power metering module mainly includes: manganese-nickel-copper alloy resistance shunt Rg, shunt terminal 1-1, fixing screw 1-2; module insulation shell 2-1, SPI bus and wiring mark 2-2, neutral line N or phase line wiring mark 2-3, LED display 2-4; circuit insulation bottom plate 3-1, neutral line N or phase line wiring pin 3-2, SPI bus and Composed of interface pins 3-3; the sensor module has shunt Rg terminals 1 and 2, isolated SPI bus and interface 3...14 wiring pins.

[0047] Sampling current access circuit, high voltage isolation voltage mutual induction transformer T, symmetrical resistance bridge RE voltage division sampling circuit, single-phase electric metering circuit 10-2, SPI optical isolation interface circuit 10-3, power supply voltage stabilization circuit 10-4, Integrate a thick film circuit and install it in an electrically insulating shell, and externally connect the shunt Rg, isolate the ...

Embodiment 3

[0049] like Figure 5 As shown, a single-phase isolated SPI bus power metering module is used to construct a single-phase APLC meter. The single-phase isolated SPI bus power metering module circuit uses three key components: a shunt Rg, a small high-voltage isolated voltage mutual inductance transformer T, and a resistor bridge RE. The respective functions are: the shunt Rg is used as phase line current sampling; the high voltage isolation voltage mutual inductance transformer T is used as phase line and neutral line voltage sampling, and at the same time it is the power supply of the voltage stabilizing circuit; the resistance bridge RE is used as voltage sampling symmetrical precision voltage divider input to the V2P and V2N pins of the electric metering chip; the primary coil of the high-voltage isolation voltage transformer T is connected to the phase line and the neutral line through the resistors RW1 and RW2, the transient voltage suppressor DW, and the varistor RW, and t...

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Abstract

The invention relates to an isolated serial peripheral interface (SPI) bus electric energy measuring module and an APLC electricity meter. The isolated SPI bus electric energy measuring module consists of a tensile transient overvoltage electric quantity input circuit, a single-phase electricity measuring circuit, an SPI optical isolation interface circuit and a first voltage stabilizing circuit, wherein a shunt, a sampling current access circuit, a high-voltage isolation voltage transformer T and a symmetrical resistance bridge RE partial pressure sampling circuit are arranged in the tensile transient overvoltage electric quantity input circuit; the shunt is used for sampling the phase line current; the sampling current is filtered and is input into the single-phase electricity measuring circuit through the sampling current access circuit; the high-voltage isolation voltage transformer serves as a phase voltage or a line voltage for sampling and serves as the first voltage stabilizing circuit for supplying power; and alternating voltage at two ends of a secondary coil of the high-voltage isolation voltage transformer T is input into the input end of the symmetrical resistance bridge RE through resistance.

Description

technical field [0001] The invention relates to an APLC single-phase measuring line voltage and current, and calculates instantaneous voltage and current effective value (RMS), active power, reactive power and apparent power isolated SPI bus power metering module, the isolated SPI bus power metering module is The shunt current sampling is used; and three independent single-phase isolated SPI bus energy metering sensor modules and microprocessing circuits, as well as the asymmetrical power carrier communication circuit APLC, can be used to form an APLC power carrier communication three that is resistant to strong transient overvoltage interference. Phase four-wire system APLC ammeter, or use four independent single-phase isolated SPI bus energy metering sensor modules and micro-processing circuits to form a three-phase four-wire system APLC ammeter with neutral current measurement, and use three mutually independent Single-phase isolated SPI bus electric energy metering sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R11/54G01R11/02G01R22/06G01R15/22H04B3/54
Inventor 郭建国毛星原
Owner 郭建国
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