參數(shù)資料
型號(hào)： ADE7762
廠(chǎng)商： Analog Devices, Inc.
英文描述： Polyphase Energy Metering IC with Phase Drop Indication
中文描述： 多相電能計(jì)量IC降表明了相
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 363K
代理商： ADE7762
Preliminary Technical Data
ADE7762
PHASE MONITOR
The ADE7762 has phase monitoring functions to detect phase
dropout, phase sequence error, and reverse polarity using four
pins. Phase dropout has the highest priority, and reverse
polarity has lowest priority. If a phase dropout occurs, phase
sequence error indication is disabled until all three phases are
above the phase dropout level (see the Phase Dropout Error
section). Because the dropout detection level is not set to zero, a
phase can have some small voltage during phase dropout
condition. Therefore, reverse polarity is still indicated on that
phase if the proper conditions occur.
Rev. PrB | Page 19 of 28
The phase monitor circuit functions by multiplexing signals onto
the four pins. The four multiplexed pins are LED_CTRL, LED_A,
LED_B, and LED_C. Two LEDs can be connected to each pin as
shown in Figure 25. When LED_CTRL is high, LED_A would be
low to turn on an LED and indicate a phase drop condition on
Phase A. When LED_CTRL is low, LED_A is high to indicate a
reverse polarity (REVP) condition on phase A. Phase sequence
error is indicated by blinking the Phase Seq/Drop LEDs.
LED_CTRL switches at a rate of 131 kHz so that both the Phase
Seq/Drop LEDs and REVP LEDs can appear to be on simultane-
ously, which allows indication of phase dropout and REVP at the
same time. For the timing diagram, see Figure 3.
R
LOAD
REVP
LED_A
PHASE
SEQ/DROP
LED_CTRL
R
LOAD
REVP
LED_B
PHASE
SEQ/DROP
R
LOAD
Figure 25. Phase Monitor Circuit
REVP
LED_C
PHASE
SEQ/DROP
0
Phase Dropout Error
The ADE7762 indicates a phase drop condition when there is
low voltage signal or no voltage signal on a phase. The phase
dropout condition occurs when the amplitude of the phase
drops below 20% of full-scale analog input voltage or when a
zero crossing is not followed by another zero crossing on that
phase for 150 ms. When this occurs, a phase dropout signal is
generated and the Phase Seq/Drop LED is turned on for the
missing phase. The delay between the phase drop condition
occurring at the analog inputs and indication of the condition
on the LED outputs is approximately 150 ms. During a phase
dropout condition, energy continues to accumulate on the
dropped channel, as well as the other channels, and phase
sequence error indication is disabled. The Phase Seq/Drop LED
for the dropped phase is turned off when the zero crossings
return for more than 150 ms and there is more than 20% of full-
scale input voltage on the voltage input of that phase.
Phase Sequence Error
The ADE7762 detects the zero crossing of each phase. A phase
sequence error occurs when the sequence A>B>C>A> … is vio-
lated. If a phase sequence error occurs, the Phase Seq/Drop LEDs
blink at 1 Hz (see Figure 26).
Phase sequence error and REVP can be displayed simultaneously.
The REVP LEDs continue to indicate reverse polarity if the proper
conditions exist. For example, if the phase sequence becomes
A>C>B>A… and phase B has negative active energy accumulated,
then the REVP LED for phase B is on solid and all of the Phase
Seq/Drop LEDs would be blinking at 1 Hz. The delay in indicating
the phase sequence error with blinking LEDs is approximately
150 ms from the time that a phase sequence error occurs.
A
B
C
PHASE SEQ/DROP LEDS ARE OFF.
A = 0
°
B = –120
°
C = +120
°
B
A
C
A
C
B
PHASE SEQ/DROP LEDS ARE BLINKING AT 1Hz.
A = 0
°
C = –120
°
B = +120
°
C
A
B
WAVOLTAGE
80% FS
RISING ZERO
CROSSINGS
WAVOLTAGE
RISING ZERO
CROSSINGS
80% FS
0
A
B
C
PHASE SEQ/DROP LED FOR PHASE B IS ON.
Figure 26. Phase Sequence Detection
A = 0
°
C = –120
°
B = +120
°
B
A
C
RISING ZERO
CROSSINGS
WAVOLTAGE
80% FS
20% FS
Reverse Polarity Error
When reverse power is detected on any phase, the
corresponding REVP LED turns on for that phase. For example,
if the power for phase A is negative, the REVP LED connected
to LED_A turns on. The indication of REVP on the LED_A,
LED_B, or LED_C pins is nearly instantaneous. As soon as the
input to the ADCs changes and the power is calculated such
that there is a reverse power condition on any phase, the
appropriate LED is turned on.
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