BELLING BL6533 Single phase, lcd, energy meter ic Datasheet

BL6533
FEATURES
1
High accuracy, less than 0.1% error over a
The BL6533 is a low cost, high accuracy, high
dynamic range of 500 : 1
2
Exactly measure the real power in the positive
orientation and negative orientation, calculate
the energy in the same orientation
3
18×4 bit RAM for display data storage
4
Single 5V supply
Single Phase, LCD, Energy Meter IC
stability, simple peripheral circuit electrical energy
meter IC. The meter based on the BL6533 is intended
for using in single-phase, two-wire distribution
systems.
The BL6533 adopts the oversample technology
and digital signal processing technology. It can
exactly measure the real power in the positive
orientation and negative orientation and calculate the
energy in the same orientation.
BL6533 thinks over the stability of reading
error in the process of calibration.. An internal no-load
threshold ensures that the BL6533 does not exhibit
any creep when there is no load.
◆
BL6533 System
http://www.belling.com.cn
-1Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
BLOCK DIAGRAM
LQPF64
http://www.belling.com.cn
-2Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
PIN DESCRIPTIONS
Pin
Symbol
DESCRIPTIONS
1
VDD
Provides the supply voltage for the circuitry. It should be maintained at 5 V
±5% for specified operation.
2,3,4,5
NC
6,7
V1P,V1N
8
NC
Unused
9
V2P
Positive Inputs for Voltage Channel. These inputs provide a input. The
maximum differential input voltage is 330 mV for specified operation.
10,11
NC
Unused
12
GND
13,14,15,16
NC
17
GND
Provides the ground reference for the circuitry.
18
VLCD
LCD power source
19,20
V1,V2
Earth capacity,Ameliorate LCD output waveform
21
Com0
Common terminal driving output
22
Com1
Common terminal driving output
23
Com2
Common terminal driving output
24
Com3
Common terminal driving output
25
Seg17
Segment terminal driving output
26
Seg16
Segment terminal driving output
27
Seg15
Segment terminal driving output
28
Seg14
Segment terminal driving output
29
Seg13
Segment terminal driving output
30
Seg12
Segment terminal driving output
31
Seg11
Segment terminal driving output
32
Seg10
Segment terminal driving output
33,34
NC
35
Seg9
Segment terminal driving output
36
Seg8
Segment terminal driving output
37
Seg7
Segment terminal driving output
38
Seg6
Segment terminal driving output
39
Seg5
Segment terminal driving output
40
Seg4
Segment terminal driving output
41
Seg3
Segment terminal driving output
http://www.belling.com.cn
Unused
Inputs for Current Channel. These inputs are fully differential voltage
inputs with a maximum signal level of ±660 mV
Provides the ground reference for the circuitry.
Unused
Unused
-3Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
42
Seg2
Segment terminal driving output
43
Seg1
Segment terminal driving output
44
Seg0
Segment terminal driving output
46,46
NC
47
VDD
Provides the supply voltage for the circuitry. It should be maintained at 5 V
±5% for specified operation.
48
OSC2
Oscillator crystal on
49
OSC1
Oscillator crystal in
50
VPP
51
A1
Unused
Reset to the device
Reset computation setting: High Voltage: clear
Low Voltage: keep
52
SCL
IIC Serial Clock Output
53
SDA
IIC Serial Data
54
CF
Calibration Frequency. The CF logic output gives instantaneous real power
information.
55
A2
Decimal digits setting: High Voltage: Twain decimal digits
Low Voltage: one decimal digits
56,57,58
NC
Unused
59
A3
A3
A4
Pulse constant
60
A4
0
0
3200 imp/kwh
0
1
800 imp/kwh
1
0
1600 imp/kwh
1
1
6400 imp/kwh
61,62,63,64
NC
Unused
电性能参数
极限参数
Parameter
Symbol
Value
Unit
Analog &Digital
power Voltage
VDD
VDD
VSS-0.3 to VSS+6.5
V
Analog Input
Voltage
VI
VSS-0.3 to VDD+0.3
V
Operating
Temperature
Range
TA
-40 to +75
℃
Storage
Temperature
Range
TS
-50 to +125
℃
400
mW
Power
Dissipation
http://www.belling.com.cn
-4Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
ABSOLUTE MAXIMUM RATINGS
(TA=25℃ VDD=5.0V)
Parameter
Symbol
Test Condition
Min
Value
Typical
Value
Max
Value
Unit
VDD
-
4.7
-
5.5
V
2.LCD POWER
VLCD
-
2.7
-
5.5
V
3.Input
VIH1
Input Pin
0.7VDD
-
VDD
V
Input Low
Voltage 1
VIL1
Input Pin
0
-
0.3VDD
V
4. Input High
VIH2
RES
0.9VDD
-
VDD
V
VIL2
RES
0
-
0.4VDD
V
±1
V
1.Power
Current
High
Voltage 1
Voltage 2
Input Low
Voltage 2
5. Analog Input
Pins
V1P,V1N
V2P
Maximum
Input Voltage
Pin6,7,
9
VAIN
DC Input
Impedance
330
Input
Capacitance
6.dynamic
6
IDD
4MHz,No load
-
7
Kohm
10
pF
10
mA
current
TERMINOLOGY
1) Measurement Error
The error associated with the energy measurement made by the BL6533 is defined by the following
formula:
2) Nonlinear Error
The Nonlinear Error is defined by the following formula:
eNL%=[(Error at X-Error at Ib) / (1+Error at Ib )]*100%
http://www.belling.com.cn
-5Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
When V(v)= ±110mV, cosϕ=1, over the arrange of 5%Ib to 800%Ib, the nonlinear error should be less
than 0.1%.
3) Positive And Negative Real Power Error
When the positive real power and the negative real power is equal, and V(v) =±110mV, the test current
is Ib, then the positive and negative real power error can be achieved by the following formula:
eNP%=|[(eN%-eP%)/(1+eP%)]*100%|
Where: eP% is the Positive Real Power Error, eN% is the Negative Real Power Error.
4) Power Supply Monitor
BL6533has the on-chip Power Supply monitoring The BL6533 will remain in a reset condition
until the supply voltage on VDD reaches 4 V. If the supply falls below 4 V, the BL6533 will also be reset
and no pulses will be issued on CF.
THEORY OF OPERATION
Principle of Energy Measure
In energy measure, the power information varying with time is calculated by a direct multiplication of
the voltage signal and the current signal. Assume that the current signal and the voltage signal are cosine
functions; Umax, Imax are the peak values of the voltage signal and the current signal; ωis the angle
frequency of the input signals; the phase difference between the current signal and the voltage signal is
expressed asφ. Then the power is given as follows:
p (t ) = U max cos( wt ) × I max cos( wt + ϕ )
If φ=0:
p (t ) =
U max I max
[1 + cos(2 wt )]
2
If φ≠0:
p (t ) = U max cos(ωt ) × I max cos(ωt + Φ )
= U max cos(ωt ) × [I max cos(ωt ) cos(Φ ) + I max sin(ωt ) sin(Φ )]
U max I max
[1 + cos(2ωt )] cos(Φ ) + U max I max cos(ωt ) sin(ωt ) sin(Φ )
2
U I
U I
= max max [1 + cos(2ωt )] cos(Φ ) + max max sin( 2ωt ) sin(Φ)
2
2
U max I max
U max I max
=
cos(Φ) +
[cos(2ωt ) cos(Φ) + sin(2ωt ) sin(Φ)]
2
2
U I
U I
= max max cos(Φ) + max max cos(2ωt + Φ)
2
2
=
P(t) is called as the instantaneous power signal. The ideal p(t) consists of the dc component and ac
component whose frequency is 2ω. The dc component is called as the average active power, that is:
P=
U max I max
cos(ϕ )
2
http://www.belling.com.cn
-6Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
The average active power is related to the cosine value of the phase difference between the voltage
signal and the current signal. This cosine value is called as Power Factor (PF) of the two channel signals.
Figure1.
The Effect of phase
When the signal phase difference between the voltage and current channels is more than 90°, the
average active power is negative. It indicates the user is using the electrical energy reversely.
Operation Process
In BL6533, the two ADCs digitize the voltage signals from the current and voltage transducers. These
ADCs are 16-bit second order sigma-delta with an oversampling rate of 900 kHz. This analog input
structure greatly simplifies transducer interfacing by providing a wide dynamic range for direct
connection to the transducer and also simplifying the antialiasing filter design. A programmable gain
stage in the current channel further facilitates easy transducer interfacing. A high pass filter in the
current channel removes any dc component from the current signal. This eliminates any inaccuracies in
the real power calculation due to offsets in the voltage or current signals.
The real power calculation is derived from the instantaneous power signal. The instantaneous power
signal is generated by a direct multiplication of the current and voltage signals. In order to extract the
real power component (i.e., the dc component), the instantaneous power signal is low-pass filtered.
Figure 2 illustrates the instantaneous real power signal and shows how the real power information can be
extracted by low-pass filtering the instantaneous power signal. This scheme correctly calculates real
power for nonsinusoidal current and voltage waveforms at all power factors. All signal processing is
carried out in the digital domain for superior stability over temperature and time.
http://www.belling.com.cn
-7Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
Figure 2.
Signal Processing Block Diagram
The low frequency output of the Bl6533 is generated by accumulatingm this real power information.
This low frequency inherently means a long accumulation time between output pulses. The output
frequency is therefore proportional to the average real power. This average real power information can,
in turn, be accumulated (e.g., by a counter) to generate real energy information. Because of its high
output frequency and hence shorter integration time, the CF output is proportional to the instantaneous
real power. This is useful for system calibration purposes that would take place under steady load
conditions.
VOLTAGE CHANNEL INPUT
The output of the line voltage transducer is connected to the BL6533 at this analog input. The maximum
peak signal on Channel 2 is 330mV.
CURRENT CHANNEL INPUT
The voltage outputs from the current transducers are connected to the BL6533 here. The maximum
differential voltage on Current Channel 2 is ±660mV. The maximum common-mode voltage is ±
100mV.
Power Supply Monitor
The BL6533 contains an on-chip power supply monitor. If the supply is less than 4V±5% then the
BL6533 will go in an inactive state, i.e. no energy will be accumulated when the supply voltage is below
4V. This is useful to ensure correct device operation at power up and during power down. The power
supply monitor has built-in hysteresis and filtering. This gives a high degree of immunity to false
triggering due to noisy supplies.
The trigger level is nominally set at 4V, and the tolerance on this trigger level is about ±5%. The power
supply and decoupling for the part should be such that the ripple at VDD does not exceed 5V±5% as
specified for normal operation.
http://www.belling.com.cn
-8Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
Package Dimensions
http://www.belling.com.cn
-9Total 10 Pages
9/9/2009
BL6533
Single Phase Energy Meter IC with LCD Driver
Application sketch map
LCD
RC POWER
5V
24C02
BL6533
CF
Voltage sampling
I
+
http://www.belling.com.cn
220V AC
I
-
- 10 Total 10 Pages
9/9/2009
Similar pages