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参数资料
| 型号： | 78M6613-IMR/F/P |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC32 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, QFN-32 |
| 文件页数： | 3/33页 |
| 文件大小： | 957K |
| 代理商： | 78M6613-IMR/F/P |
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DS_6613_018
78M6613 Data Sheet
Rev. 1.1
11
2
Functional Description
2.1
Theory of Operation
The energy delivered by a power source into a load can be expressed as:
∫
=
t
dt
t
I
t
V
E
0
)
(
)
(
The following formulae apply for wide band mode (true RMS):
P = ∑
(i(t) * v(t))
Q = √(S2 – P2)
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 Teridian 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
100
200
300
400
500
0
5
10
15
20
Current [A]
Voltage [V]
Energy per Interval [Ws]
Accumulated Energy [Ws]
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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相关代理商/技术参数 |
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|---|---|
| 78M6613-PSU-1 | 功能描述:开发板和工具包 - 8051 78M6613 PSU Board RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
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| 78M6613-SP-1 | 功能描述:开发板和工具包 - 8051 Sgl Phase AC Pwr Measurement IC RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 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 |
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