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
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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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