参数资料
| 型号： | 78M6613-SP-1 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/33页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT 78M6613-SP-1 |
| 标准包装： | 1 |
| 系列： | * |
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DS_6613_018
78M6613 Data Sheet
2
2.1
Functional Description
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 formulae apply for wide band mode (true RMS):
?
P= ∑
(i (t) * v (t))
?
?
?
?
Q = √(S 2 – P 2 )
S=V*I
V = √∑ v (t) 2
I = √∑ i (t) 2
For a practical measurement, not only voltage and current amplitudes, but also phase angles and
harmonic content may change constantly. Thus, simple RMS measurements are inherently inaccurate,
and true RMS measurements must be utilized. A modern solid-state electricity Power and Energy
Measurement IC such as the 78M6613 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 4: Voltage. Current, Momentary and Accumulated Energy
Figure 4 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.
For actual measurement equations, refer to the applicable firmware documentation .
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| 78M6618-PDU1 | BOARD EVAL 78M6618 PDU1 |
| 78M6631-EVM-1 | EVAL BOARD 78M6631 |
| 78P2351R-DB | BOARD DEMO FOR 78P2351R |
| 79-WHITE-1"X60YD | TAPE GLASS CLOTH 1"X 60YD WHT |
| 79059-2701 | CONN RECEPT R/A 50POS 4-40 SCSI |
相关代理商/技术参数 |
参数描述 |
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| 78M6618 | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Octal Power and Energy Measurement IC |
| 78M6618-IM | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Octal Power and Energy Measurement IC |
| 78M6618-IM/F | 功能描述:计量片上系统 - SoC 8 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 |
| 78M6618-IM/F/P | 制造商:Maxim Integrated Products 功能描述:PROGRAMMED - LEAD FREE - Rail/Tube |
| 78M6618-IM/F/PB1 | 制造商:Maxim Integrated Products 功能描述:- Trays |
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