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As shown in the bellowing figure, when can set different Vgs conditions, and then sweep Vds to get Ids_Vds curves with various Vgs. Then extending those curves and crossing at Va point, then we know the value of Va, then lamda=1/Va. 134969 In real life, the curves are not so "straight", so how can we know which location
Hello,I would like to control the speed of an AC Single phase motor I constructed the ciruit as you find in attachment.I have the following problem which I would like you to help me solving: >>Whith the snubber of 1nF/250V(shown by multimeter) and 1.5Kohm is not allowing the PIC to control the motor >>When the optocoupler MOC3020 is replaced by a
Hello all, Can anybody tell me how a freq command works in cadence spectre? I know it takes the reciprocal of the average time between two successive mid point crossing of the rising waveform. Does anybody know in what time frame it takes an average?
you need to plot the input impedance of the antenna which is, in the case of single port network, Z11. The real part should be around 50 and the imaginary part should be crossing zero at that point. An alternative way is to plot S11 and the antenna is considered to be matched when S11<=-10dB.
Round trip delay is a valid point. It's also no always so that you have a sufficient fast oversampling clock available. Alternatively, you may want to run the shift register from SPI SCK ("SCLK") and implement domain crossing logic for the parallel data.
From the MOC3021datasheet, that resistor should be around 180 ohms. You could check the datasheet for further circuit design tips. What's the pulse duration from your Arduino? I hope it doesn't pass the next zero crossing point.
I don't think you can increase the accuracy starting from a printed graph. However the log scale is simply a representation of the curves so you don't have to perform any kind of transformation. You can take from the graphs the point at the crossing of vertical and horizontals grid lines, put it into excel and print a linear graph.
The ZCD in your MOC will automatically switch at the zero crossing point, if your MOC drive is high, whatever the state the 50Hz cycle is in. So apply a short High to the MOC control signal input and the MOC will enable the Triac at zero crossing. E
The positive net from V1 is not properly connected to R2, but it is crossing it.
Assume that positive-going zero-crossing pulse is polled by RA0 of PIC 16F676. What will be the code in C compiled by mikroC ? # define zero_pulse PORTA, 0; BTFSC zero_pulse; Goto $-1; BTFSS zero_pulse; Goto $-1 ; ????. ; Rest of code sbit zero_pulse at PORTA.B0
Hi I am working on a project analyzing the ac power line and I need to detect the zero-crossing point using an 16bit ADC, is there a smarter/better way of doing this than if(last_sample==<== adc_average&==&== current_ sample> adc_average) I sample 128 times per period and I'm calculating the adc_average every period, by using the method above
You are talking about CDC checks for making sure e.g. the set of signals crossing the domain do not have a delay spread larger than one receiving-domain clock period? You still might want to declare a FP between the unrelated clocks, e.g. if you are specifying min/max delay constraints as point-to-point timing exceptions only for the actual (...)
Hi plz anybody can help me as want to know the slew time for ddr2 signal is measured with which reference as from VINHAC to VINLDC for Falling and VINLAC to VINHDC FOR Rising or from the vref crossing point to VINHAC for rising and Vref to VINLAC for falling edge.
It's a regulated power supply with a voltage zero crossing detector. The zero point won't be very well defined in this circuit but it will occur once per half cycle. As it stands there is no output waveform, to make it work you will need an additional resitor from the "to mcu" connection to the MCUs supply line (probably the +5V from the regulator)
you measure the DC offset to the zero crossing points of the sine wave cycle the zero crossing point of the AC sinewave is sitting at 6V on your CRO. When measuring AC ripple on a power supply is the measurement from the Oscilloscope's zero Origin zero volts to the negative peak of the AC sinewave or to the zero (...)
i wanna ask about the availability of current transformer and voltage transformer in the market as i need it in low voltage assembly i.e 25 volts ac. actually i need to make power factor meter which require a current transformer and a voltage transformer, each of which gives waveform out of which zero crossing point will be extracted using op-amp a
As I keep saying, and Jeffrey confirms, the resistance and power rating of the heater has nothing to do with the thermstat not operating. The thermostat is simply an on/off switch that is operated by the temprature crossing the trip point. Below the trip point the thermostat switch will be closed and almost a short circuit (zero Ohms), (...)
You will be unable to change the origin and the components not move, they will move relative to their origin. However, for those components that do need the origin moving, if you can place a temporary feature like a figure/line - perhaps crossing the pads to make a centre point then when the component moves you have something to snap back to when
Since Zero crossings are bidirectional with no hysteresis, unless specified. You only need to mask the "sign bit" to look at data for zero crossings. - Initialize counter. - Initialize data - For N = 1 to 500 points - Initial data point = your Bias (or DC) slicer level reference of data for "zero (...)
You can plot Id vs. Vds and extrapolate to the crossing point with the horizontal axis. But this is a lost battle - for sub-100nm technologies, ro varies all-over the place. You'll most probably get different lambda values for different Vgs. Not to mention that if well modeled, the ro will vary also with the Vds.
Hi, Please i need a synchronistion technique for the below CDC 1. Source clock 400Mhz 2. Destination clock 80 Mhz A pulse is generated in 400Mhz clock domain and between two pulses there is only two clock cycle difference is there So how can we synchronise this pulses into the 80Mhz clock domain? I think handshaking wont work for this i
A zero crossing detector is normally a hardware solution, there is no code for it. When your hardware has found the zero crossing point, you can alter the trigger point by using a software delay between zero and the period of the waveform. Brian.
The schematic depends on how precisely you want to detect the zero crossing point. One simple solution used in many printer/faxes is to put resistors 100k-200K in serial with bidirectional optron (two LED in opposite directions). If resistors are SMD it is recommended to put several in serial to increase the breaking voltage. On the other side o
1. Find out the period of one cycle,this is (1 / AC mains frequency). For example if you have 50Hz mains it is 1/50 = 20mS, if your AC is 60Hz the period is 1/60 = 16.66mS 2. Detect the zero crossing point where the AC passes zero on the swing toward positive. 3. Wait for (period/4) so you are beyond the positive peak and on the fall back toward z
It is easy,you have make some circuit of zero crossing externally.this signal feed one of microcontroller port bit. and from that point to start delay. one half sine wave of 50 hz has a time of 20 milli sec. if trigger pulse delayed for say 10 mili sec. after this time produce a sharp pulse say 100 u-sec. then you are allowing half powerto the l
1. Detect the zero crossings 2. measure the period (20 ms), ie. the time between 2 positive going zero crossings 3. divide the period by 4 4. wait that time after a positive going zero crossing 5. measure the sine voltage at that point.
I need to control a a load (heater) using a triac. I need to use something like pulse skipping modulation to control the heater. The Microcontroller board and Analogue part will be working from a +12-0 -12V transformer based power supply. I think I can use the DC before filter with a transistor arrangement to trap the zero crossing point for microc
HELLO ~ 8-) I've designed and measured CML type tx buffer. But the waveform has some problem. If there are some capacitive loading, I think slow rising time is ok, but this waveform has the inflection point at the crossing point. Thus it makes EYE more worst. Where is it from? Just typical waveform with hard capacitive load? or (...)
hi, i have a problem in calculating signal enery, zero crossing point and the largest amplitude of the signal in time domain analysis. anybody can help me in calculating above specifications in matlab. i will be thankful to you,
There are two LO signals in my mixer design. One frequency is 2.5G, the other is 5G. Now I need to control the phase of of both LO signals: when the 2.5GHz signal(sine wave) is crossing the zero point, the 5GHz signal is at its lowest point. I have tried to use LO buffers(inverter chain)to set delay to the LO signals, but the result (...)
Hi All, Can someone point me to some document describing how to design fifo for signals having say 8 bit for clock domain crossing. Thanks, Added after 6 minutes: I am assuming that uses Gray Code encoding. how does it use gray code ? Thanks
Hi all..! I have developed a single supply zero crossing detector from the link ... The circuit is also given in LM393 datasheet . It does work. AC input is 12V from transformer. The circuit makes AC and DC ground common... AC input is al
hi everybody i am working on a project in which i have interfaced ADE7758 with AT89c51ED2 using on-chip SPI engine. when i am reading electrical parameters such as voltage, current, KW,PF etc. it gives me value without any problem. when i am setting zero crossing interrupt enable bit it gives me interrupt on zero crossing point of AC (...)
Pins 14 and 15 give a pulse out one the rising and falling zero crossing point. See page 3 of the data sheet. Keith.
Hi, Try this zero-crossing detector. I use this for my 12F675 based lamp dimmer. It generates a high-to-low pulse every it helps. Tahmid.
simple question, simple answer? measure the 3 phases and compare the magnitudes. for phase imbalance, perhaps a zero-crossing detector + timer. Mr.Cool
i think the problem is not come from snubber, but the source code, i not sure using pwm is the best practice to trigger this circuit. in my opinion you should calculated proportion delay since every zero crossing signal as starting point.
i want to choose Low IF architecture. there have a question. when i use 2MHz IF, zeros-crossing detector can't count 1 cross point more than IF. Because for IF, there have 4 zero crossing points, but for symbol "1", the frequency is 2.14MHz and there have 4.28 zeros crossing points. (...)
R48 and C17 have nothing to do with "timing" .. It is simple snubber circuit .. see picture below .. Component that decides when to fire triacs is PIC microcontroller - not on the picture .. It uses signal from zero-crossing detector as reference and, depending on how do you program it, sends pulses to PIC_T1 and PIC_T2 to control both triacs
As on1aag pointed out, there may be communication signals superimposed on your power. The amplitude of such communication signals, however, is well below that of the primary power signal amplitude. As a result, you CAN use a one-shot to completely eliminate this type of noise problem! Simply set the time duration of the one-shot so
A. Don't forget about pin 5 = 0V (GND) .. B. 3-wire cable will be fine .. C. I don't think you need any additional wires .. One more thing, remember about crossing over cables, so Tx(1) of one device is connected to Rx(2) of the other device, and Rx(1) to Tx(2) .. Regards, IanP
In 6 switch 3 ph inverter i'm generating 3ph sinusoidal signal and applying to a 3ph motor.. I'm using a dead time of 3.3us. With a locked rotor output voltage waveform is pure sinusoidal. But while motor revolves it's not pure and distorted around the zero crossing point significantly. 1- How can we determine the min dead time to avoid this? 2-
The only difference will be in the "noise" generated by both options. The "zero-crossing" will be almost noise-less, as it is swithed on and off when the current/voltage is at "zero", whereas the phase-controlled option will generate a lot of electro-magnetic noise .. as the switchig point can be anywhere between 0-180°/180°-360°.. Regards, Ianp
for two waveform a and b how to measure the crossing points' time in hspice? suppose do transient simulation?
ok,the point is symmetry ,including the device self,the devices between eath other ,the connecting metal,even the dummy...and at the same time ,don't forget the crossing match ways.Use your heart and an artwork will apear in your hand at last. Regards flyankh
if you can accept a crossing at 0.7V, why not use base-emitter junction? ASIC
I have a few questions about LVDS LVDS: (1) The clock pair frequency is different from the data pair frequency. What is the skew requirements between clock pair and data pairs? (2) How should I measure the delay: Is it from the crossing point of the driver differential pair to the crossing point of the receiver (...)