参数资料
| 型号： | ARD00280 |
| 厂商： | Microchip Technology |
| 文件页数： | 16/50页 |
| 文件大小： | 0K |
| 描述： | KIT REF DESIGN PIC18F87J72 1PH |
| 设计资源： | PIC18F87J72 BOM PIC18F87J72 Schematics PIC18F87J72 Gerber Files |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PIC18F87J72 |
| 主要属性： | 单相分流电度表 |
| 已供物品： | 板 |
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PIC18F87J72 Single-Phase Energy Meter Reference Design
2.2
INPUT AND ANALOG FRONT END
The PIC18F87J72 Single-Phase Energy Meter Reference Design comes populated
with components designed for 220V line voltage. At the bottom of the main board are
the high voltage line and neutral connections. There are four connections that are
made from the PCB to the meter casing. They are labeled LINE, NEUTRAL, SHUNT1,
and SHUNT2. The shunt sits on the high or line side of a two-wire system and the meter
employes a hot or “live” ground. The wires going into the shunt to SHUNT1 and
SHUNT2 should be twisted together. The wires going into the LINE and NEUTRAL side
of the meter should be twisted together, and also kept away from the SHUNT1 and
SHUNT2 wires if possible.
The neutral side of the two-wire system goes into a resistor divider on the voltage chan-
nel input. Anti-aliasing low-pass filters will be included on both differential channels.
The voltage channel uses two 332 k Ω resistors to achieve a divider ratio of 664:1. For
a line voltage of 230 V RMS , the channel 1 input signal size will be 490 mV PEAK . The cur-
rent channel of each phase uses current transformer with a turns ratio of 2000:1 and
burden resistance of 56.4 k Ω . The resulting channel 0 signal size is 340 mV PEAK for
20A, or twice the rated maximum current of the meter, still within the input range of the
A/D converter of the PIC18F87J72.
LINE_SHUNT1
Shunt
(external to
PCB part of
150 FB (Note)
1.0 k Ω
68 nF
CH0+
meter case)
LINE_SHUNT2
150 FB (Note)
1.0 k Ω
68 nF
CH0-
NEUTRAL
330 k Ω 330 k Ω
1.0 k Ω
0 Ω
68 nF
PIC18F87J72
CH1+
1.0 k Ω
CH1+
68 nF
Note:
FB = ferrite beads. Ferrite beads have an impedance of the
specified value at 100 MHz.
FIGURE 2-4:
DS51931A-page 16
Analog Input Circuitry.
? 2011 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| ARD00330 | DAUGHTER BOARD PIC18F87J72 |
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| AS5163 CB | BOARD CONNECTION AS5163 |
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