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3answers
27 views

Multiple Demultiplexers In Series

Basically I need some demultiplexers to switch between 24 outputs. The data inputs would be connected to counters for the addresses. I'm currently using 74ls138 3-8 line demultiplexers. Is this ...
0
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0answers
14 views

How many measurement samples does a typical phasor measurement unit (PMU) transmit in each communication session?

Given a smart grid network, how many measurement samples (voltage and phase angles) does a typical PMU capture from a transmission line? I know that in each communication session, a PMU transmits ...
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2answers
62 views

Synchronous generator mechanical characteristic

Why does the synchronous generator produce a torque just in correspondence of the synchronous speed, that is why is he mechanical characteristic just a straight vertical line in \$\omega = \omega_S\$ ...
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1answer
69 views

Finite State Machine Design for Entering/Exiting Door Sensor

I have attached an image of the assignment. I don't need to physically build it, just draw it using flip flops, mulitplexers, and logic gates. Not sure where to start at all. I appreciate any pointers ...
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2answers
37 views

Source synchronous vs Common clock methodology in Physical design

I understand common clock and source synchronous clock. From this link http://referencedesigner.com/books/si/common-vs-source-sync.php. What i do not understand 1) How is maximum frequency attained ...
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1answer
20 views

ACB vs Contactor for synchronous generators

I've been told by an experienced electrical engineering colleague that it is preferred to use an ACB rather than a contactor for making and breaking the connection to a synchronous generator, but he ...
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3answers
96 views

8 bit PICs: timer1 asynchronous vs synchronous operation

The 8-bit PIC family (I'm working with pic18f46k22) offers some timers (timers1/3/5) that can work in both asynchronous and synchronous modes when clocked from an external source. The obvious ...
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1answer
49 views

Difference between D-Type Flip-Flop and Edge-Triggered D-Type Flip-Flop

I need to create a JK Flip-Flop using a D Flip-Flop, a 2-to-1 line MUX and an inverter. I wasn't really familiar with latches and Flip-Flops, but I understand the difference and how Flip-Flops are ...
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3answers
49 views

Definition of terms for a Synchronous Current-mode Buck Regulator?

I was reading the datasheet of MP1482 chip which is buck regulator, I have read some of terms in the datasheet I did not understand could any one explain it in simple world. The MP1482 is a ...
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1answer
47 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
60 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
24 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
318 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
203 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 ...
0
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1answer
44 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
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1answer
73 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
55 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
54 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
65 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
96 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 ...
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1answer
77 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
114 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 ...
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1answer
84 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
162 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 ...
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2answers
63 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
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2answers
403 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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1answer
85 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
82 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
64 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
242 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
455 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
326 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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1answer
101 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
68 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
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1answer
65 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
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2answers
117 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
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1answer
265 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 ...
0
votes
1answer
256 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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3answers
435 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
5k 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
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1answer
94 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
262 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.?
0
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2answers
183 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 ...
3
votes
1answer
286 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
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3answers
99 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 ...
0
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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
103 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
866 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 ...