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Questions tagged [commutation]

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0
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2answers
34 views

What factors affect a thyristor's “circuit commutated turn-off time”?

In datasheets, they give this value at a certain operation point (voltage, current, and di/dt). My question is... What are the effects of changing these parameters. For example, if di/dt is ...
1
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0answers
25 views

Is zero loss turn-off possible for thyristors?

Consider this very basic circuit: simulate this circuit – Schematic created using CircuitLab Don't mind the values - they don't matter, as this question is conceptual. Imagine that Vcomm is ...
0
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2answers
60 views

Looking for reed relays for high voltage commutation

I need to chose a reed relay for connecting a point to high voltage (probably between 7000V:15000V) or to GND signals. System will have 8 channels (pins). Some of 8 pins will be connected to high ...
1
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3answers
60 views

Where exactly appears the channel capacitance and Ron when switch on DG442 switches

I have this switch in a circuit, actually there is 30 switches. https://www.vishay.com/docs/70053/dg441.pdf When system is not executing any operation, switches are off. Sx and Dx are not connected. ...
2
votes
1answer
129 views

SSRs influenced by physical proximity?

This is part of a two-head EVSE. The two solid-state relays are used to drive contactors that supply high current power to the vehicles. I used to use a MOC3040 based triac circuit for this job, but ...
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0answers
78 views

Commutation techniques in SCR

I read in a textbook that "Commutation Time is more in Current Commutation compared to Voltage Commutation".Kindly Elaborate.
-2
votes
1answer
68 views

Newbie question: Feasible way of amplifying 100+ channels of slow and low amplitude signal

I want to amplify signal coming in hundreds of channels (sensor array each producing a very low amplitude 30-200Hz signal). For every channel i care only about intensity of the signal (i don't need ...
0
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0answers
19 views

How to add back emf as part of this sinusoidal commutation equation

I recently found a nice article on sinusoidal commutation which has a simple exposition of the subject. The torque is derived from first principles but the equation seems not to include BEMF. Does ...
0
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1answer
199 views

BLDC Motor rotor vibrates with audible high pitch beep, but does not spin. Controlled by custom motor controller

The circuit I have built (taken from the HIP4086A gate driver data sheet found at https://www.intersil.com/content/dam/intersil/documents/hip4/hip4086-a.pdf) is: The only difference between this ...
2
votes
1answer
149 views

LTspice diode commutation

I have modeled an ideal diode rectifier fed from a 230V/50Hz grid with a slim DC link capacitor and a constant power load (1kW) coupled with a small resistive load. For Cdc=14uF i get a phase input ...
0
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0answers
50 views

Commutation overlap symmetry

Let's say we have three phase diode (ignore SCR in the picture) rectifier: With no source inductance, diodes are conducting at following angles: Diode 1: 30º < X < 150º Diode 4: 210º < X &...
0
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1answer
47 views

How did rotary converter commutators conduct electricity?

I've been reading about rotary converters and examining photographs, but I've noticed that nearly all have a very strange (to me) commutator design. It looks like a piece of wire screen rather than ...
-1
votes
1answer
64 views

Quick specific questions about Electric Motors that I can't find on Internet

I want to talk about induction motors and Universal motors. 1) is the rotor of an Universal Motor a Wound rotor? 2) the induction motor with Wound rotor have commutators? 3) Universal Motor can ...
2
votes
2answers
888 views

Brushless DC motor problems at high velocities

For a project we use a brushless DC (BLDC) motor. Everything works fine until we tried to reach high velocities. I will first explain my setup, and than explain our problems using some graphs. ...
14
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4answers
1k views

H-Bridge Fly-Back

Sorry if this question is a little long, but I though it prudent here to discuss the state-of-the art as I know it before asking the question. ISSUE When using an H-bridge to drive a bidirectional ...