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1answer
45 views

Common way of describing a “double-sided wait”

Is there a commonly used name to describe a "double-sided wait" data transfer protocol? This is a uni-directional scheme in which data is transferred on the clock edge if both the sender and the ...
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0answers
21 views

Short circuit transients in synchronous generators

When the three terminals of generator are suddenly shorted out the short circuit fault current has both ac & dc component. i am guessing that this as inductor current can not change ...
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0answers
22 views

Counter with 4 flip flops jk synchronous from 3 to 13 [duplicate]

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Until now what i´ve ...
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5answers
211 views

Counter with 4 flip flops jk synchronous from 3 to 13!

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Ok. So i think its ...
2
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3answers
155 views

Transmitting PWM binary at 400kbps (or 800kbps)

I need to send a string of bits to a chained set of RGB LEDs, each of which have their own controller IC. The datasheet for that IC, the WS2811, is here. The protocol is quite simple: each bit, both ...
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1answer
40 views

Synchronous Serial over Internet

I have a portable diagnostics tool which communicates with an electronic appliance using which I believe is Synchronous Serial Interface (SSI). I'm looking for a way that I can extend the range of ...
1
vote
1answer
48 views

Simultaneous electronic shutter release for multiple Lumix G7 cameras

I'm trying to trigger six Panasonic Lumix G7 cameras at once. The trigger mechanism uses a four pole 2.5 mm plug, some resistors and two switches. With no switch closed there is 41 kilohms of ...
0
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1answer
51 views

driving a synchronous motor as a generator

Say I have a 100 kW synchronous motor in a building driving a pump/fan etc as part of an HVAC system. 1 - if I drive the shaft of the motor at 100 KW (from somewhere else), then the load on the ...
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0answers
52 views

Change same signal at either rising or falling state of a signal

I am bit new to VHDL, and hope some of you guys could help me here. I trying to establish a connection between an ADC, LED, and control component. The purpose of this application is to convert an ...
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0answers
54 views

What is the differene between zero leading and zero lagging?

The armature reaction of an alternator will be completely magnetising when load power factor is A unity B zero lagging C zero leading D 0.8 lagging Though ...
0
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1answer
68 views

Synchronous rectification simulation [closed]

I am (for educational and research purposes) trying to replace diodes with MOSFETs in a rectifier of a conventional automotive alternator (12V). Before I proceed with hardware implementation, I ...
0
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1answer
44 views

Salient pole vs cylindrical rotor

Why is the salient pole rotor in a synchronous machine made of laminated steel whereas a cylindrical rotor does not have any lamination?
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2answers
2k views

How can a synchronous motor have RPM other than 3000/3600?

It is said, that synchronous motor is rotating at the same speed as magnetic field rotates. But three-phase made magnetic field rotates as the frequency of current, i.e. 50 or 60 times per second, ...
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0answers
87 views

Calculation for the Boot Strap capacitor

For design of a synchronous buck converter (which would be used to charge the battery) which would be driven by Micro-controller's PWM output, i selected the IRLB8748 NMOS Power transistors (for both ...
1
vote
1answer
60 views

High Drain Current MOSFET vs Low Drain Current MOSFET for Synchronous Buck Converter

For a battery charging application, i have to build a synchronous buck converter (i/p voltage = 12V , o/p Voltage = 4.5V) which would be driven by a PWM signal from the micro-controller. This Buck ...
6
votes
1answer
107 views

Why do some microcontrollers have such huge synchronization delays?

On the Atmel SAM-D21 series microcontrollers, many peripherals use a clock which is asynchronous to the main CPU clock, and accesses to these peripherals must go through synchronization logic; on ...
3
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2answers
60 views

Syncronization Flip-flops

I've a doubt about clock domains and synchronization FF. I'm working on a FPGA and I've two clock domains. In the firs clock domain there is a clock frequency of 125 MHz, in the second the frequency ...
0
votes
2answers
241 views

Available synchronous buck converter chips are bidirectional (current)?

I was going through available synchronous buck converter ICs with external PWM capability (which can be controlled with the help of a micro-controller) and i found this one for e.g. I have read in a ...
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votes
1answer
84 views

Synchronous decade counter only 3 AND gates

I need a design for a synchronous decade counter that can have no more than 3 gates, excluding the JK's. I do not need to design this myself as it is considered above the level of course I am doing, I ...
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2answers
65 views

Factors determining number of turns in field winding of Sychronous generator

the question is simple, based on what factors do I choose the right number of turns in field winding (for synchronous generator)? It seems like the less turns there are, the more DC current is needed ...
0
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1answer
57 views

Shift register on sync RS flip-flop

I am trying to build serial-in shift register (non cycled) based on synchronous RS flip-flop, but i'v got a problem with synchronization. My clock generator was configured to long on period and short ...
0
votes
1answer
165 views

Synchronous motor base speed calculation

I would like to ask the following question. How can I calculate the base speed of a Synchronous motor for variable speed applications controlled in dq frame? I want to calculate the base speed for ...
1
vote
1answer
301 views

High current Synchronous Buck Converter, MOSFET or IGBT?

I am supposed to design a synchronous buck converter (to be driven by micro controller control signals for switching purpose). The input Voltage range is 10V-15V, and output voltage range is 4V-5V but ...
0
votes
2answers
209 views

Synchronous Generator Resistive Load Characteristics?

I have a permanent magnet synchronous machine (PMSM) that I intend to run as a generator. I'd like to test its load characteristics under resistive load. The PMSM is Y-connected. Assuming Y-connected ...
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votes
1answer
83 views

Load Torque Profile of two coupled electrical machines

I am trying to learn about the torque profile of two coupled machines. I believe that if a DC motor is driving a DC generator of identical ratings, the generator will exert rated torque on the motor ...
1
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1answer
64 views

It is better to have a negative clock skew?

Is it better to have a negative clock skew? Why? If we compare it with a positive clock skew, which is better?
0
votes
1answer
62 views

Custom USB PC-PC Interface

I would like to build a software interface using the usb4java library, for sending triggers for synchronization with the following specifications: Latency below 1 ms Range: 8-bit [0, 255] + bit [0, ...
1
vote
2answers
98 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
2
votes
1answer
181 views

how to get the angle from a 3 phases synchro signal

I'm trying to understand how to get the value of the shaft position from a synchro. I've looking in mutiple documentation but none explains how to calcuate the angle value from : I'm looking to ...
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votes
1answer
165 views

Synchronized digital cameras

at the moment im doing some research. I want to create an embedded "application" with two digital cameras ( > 30fps, global shutter, >= 800x600 resolution ) on an Freescale Arm iMx. 6 Quad (i think ...
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vote
3answers
352 views

Designing a synchronous frequency divider to 13

First post here, so sorry for mistakes or inappropriate posting. This was one of the tasks in a digital logic exam I failed today. The exact request was "Design a synchronous frequency divider to ...
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4answers
3k views

Is Power consumed by a motor under various load conditions constant?

Does a motor (dc /Induction/Synchronous ) consumes more power when operating at higher load than when operating at some lower load? Or power consumption remains constant/same in both cases? What I ...
0
votes
1answer
84 views

VHDL process causes errors

I'm new to VHDL so I just have a question to ask about why this produces an error. I have an ALU defined in VHDL: ...
1
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1answer
223 views

why 'V' curve of synchronous motor doesn't touch D.C. field current axis?

Why synchronous motor armature current doesn't become zero with field excitation change ? it can be seen from 'V' curve.?
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2answers
135 views

how to convert synchronous generator field voltage from per unit to voltge

I've been working in PSCAD and in this time I'm struggling with synchronous generator in PSCAD. As you know synchronous generator in PSCAD, working in per unite so I have to change its amount to ...
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votes
1answer
256 views

How to properly drive MOSFET in MPP tracking duty cycle above 50% for a synchronous buck regulator at 50-100V input?

I'm currently building a 10W high voltage (~50V-100V) Maximum Power Point Tracking (MPPT) buck regulator on the side for educational purposes. For the time being, the output is tied to a load. Things ...
1
vote
1answer
1k views

Genlock two OV5642 camera modules on Arduino with ArduCam

I need to shoot stereo video or stills at about 10 FPS possibly in perfect sync. My plan is to set up a 3D stereo rig (2 standalone units - each consisting of Arduino UNO + ArduCam shield + OV5642 ...
2
votes
3answers
87 views

Anyone have specific examples of how IEEE 1588 is most commonly used in industry?

I've run into the concept of IEEE 1588 synchronization over Ethernet several times, and am curious what its most common uses are and the details of why it is required. For example, I read that cell ...
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3answers
130 views

Regarding a statement given in my 'Electrical Machines' textbook about synchronous machines?

I was reading the introductory chapter of my textbook on machines and when the author comes to a little introduction on synchronous machines, I was stuck on a statement midway. It goes: "When ...
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2answers
94 views

Analyzing clock oscillator using timing diagram

In a recent examination a friend of mine was asked to analyze and find the frequency of oscillation of a clock oscillator using timing diagram as shown below: Can someone give me directions as how ...
2
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3answers
746 views

Meaning of “with respect to rotor and stator”

In the following example, when it says “with respect to stator” and “with respect to rotor”, did they mean the rotor part of the synchronous generator in both cases? Example: The excitation field in ...
3
votes
2answers
341 views

Clock Deskewing and flip flops

I have a question in my text book that I do not quite understand. I was wondering if someone could please explain what the question means? Such as, what is a deskewed flip flop. How would one find the ...
4
votes
2answers
420 views

synchronous buck ls-FET switching losses and dead time minimization

I'm designing a Synchronous buck converter. I'm having doubts regarding the following: In the rectifying period of the converter, using a Schottky diode in parallel with the low side MOSFET will ...
1
vote
1answer
160 views

Choosing Altera Quartus II clock rate for stopper

I'm using Altera Quartus II to built a stopper. I'm using 2 counters and I need to choose the right clock rate to get pulse every 1 sec. There are only two options in Quartus for the clock: 27Mhz and ...
1
vote
3answers
1k views

How to perform a synchronous output on the Arduino?

I have a device I'm trying to control with the Arduino. It works like this. Arduino sets and holds 'ready line' to 5V high. Device sees ready line high and sends 16 clock pulses for two bytes of ...
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vote
2answers
209 views

How is a synchronous 214 rpm motor for a 50 Hz mains possible?

According to Wikipedia at steady state, [...] the rotation period is exactly equal to an integral number of AC cycles. Now I have a brief description of a three-phase motor designed for 50 Hz AC mains ...
0
votes
1answer
365 views

Sequential Circuit Diagram: D Flip-Flop

Sequential Circuit Diagram: D Flip-Flop Answer Key ...
4
votes
1answer
320 views

Can a synchronous regulator “chirp” in burst mode?

I'm looking at (the millions of) buck regulators available for a project where the board will be a host board for a Gumstix Dual Cortex A9. This can pull quite a bit of current at maximum so I was ...
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4answers
4k views

How to synchronize two microcontrollers to micro-second accuracy?

I need to synchronize two micro-controllers so that they can measure the speed of propagating waves. The time delay measurements need have microsecond accuracy (error less that 1/2 of a microsecond). ...
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2answers
91 views

How electronic components keep synchronized?

So, voltage travels super fast right? Still, there has to be some lag between voltage traveling from one transistor into another. How is a circuit kept synchronized then?