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