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参数资料
| 型号： | 78M6612-IM/F |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER MEASUREMENT AC 68-QFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 260 |
| 系列： | * |
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78M6612 Data Sheet
2 Functional Description
DS_6612_001
2.1
Theory of Operation
The energy delivered by a power source into a load can be expressed as:
t
E = ∫ V ( t ) I ( t ) dt
0
The following formulas apply for wide band mode (true RMS):
Q = √(S – P )
?
?
?
?
?
P = ∑ (i (t) * v (t))
2 2
S=V*I
V = √∑ v (t) 2
I = √∑ i (t) 2
For actual measurement equations, refer to the applicable 78M6612 Firmware Description Document .
For some applications, not only voltage and current amplitudes, but also phase angles and harmonic
content may change constantly. Thus, simple RMS measurements are inherently inaccurate. A modern
solid-state electricity measurement IC such as the 78M6612 functions by emulating the integral operation
above, i.e. it processes current and voltage samples through an ADC at a constant frequency. As long
as the ADC resolution is high enough and the sample frequency is beyond the harmonic range of
interest, the current and voltage samples, multiplied with the time period of sampling will yield an accurate
quantity for the momentary energy. Summing up the momentary energy quantities over time will result in
accumulated energy.
500
400
300
200
100
0
0
5
10
15
20
-100
-200
-300
-400
Current [A]
Voltage [V]
Energy per Interval [Ws]
Accumulated Energy [Ws]
-500
Figure 5: Voltage, Current, Momentary and Accumulated Energy
Figure 5 shows the shapes of V(t), I(t), the momentary power and the accumulated power, resulting from
50 samples of the voltage and current signals over a period of 20 ms. The application of 240 VAC and
100 A results in an accumulation of 480 Ws (= 0.133 Wh) over the 20 ms period, as indicated by the
Accumulated Power curve. The described sampling method works reliably, even in the presence of
dynamic phase shift and harmonic distortion.
18
Rev 2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 78M6612-IMR/F | 功能描述:计量片上系统 - SoC 2 Out Sgl Phase Pwr & Energy Msrmt IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 78M6612-IMR/F/P | 制造商:Maxim Integrated Products 功能描述:PROGRAMMED - LEAD FREE/TAPE & REEL - Tape and Reel |
| 78M6612-IMR/F/PD | 制造商:Maxim Integrated Products 功能描述:MXM78M6612-IMR/F/PD SINGLE PHASE DUAL OU |
| 78M6612-IMR/F/PD2 | 制造商:Maxim Integrated Products 功能描述:AC POWER MONITORING SOC-PROGRAMMED - Tape and Reel 制造商:Maxim Integrated Products 功能描述:MXM78M6612-IMR/F/PD2 AC POWER MONITORING |
| 78M6612-IMR/F/PD3 | 制造商:Maxim Integrated Products 功能描述:MXM78M6612-IMR/F/PD3 SINGLE-PHASE, DUAL- |
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