Questions tagged [scr]
A Silicon Controlled Rectifier - A PNPN or NPNP semiconductor device that once triggered stays in permanently conductive state until the current is removed. USed in protective circuits and chopper style light dimmer switches. Also know as a thyristor.
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SCR reverse current during switch off
In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off.
I'm interested in calculating the maximum reverse current (iR in the plot).
The parameters that ...
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10 views
High inrush fromTriac 120/277v driver
Wondering if anyone has had problem with unison rack. Causing lights to flicker between 30 & 50% but no flickering between any other levels. The test results was that the inrush was causing miss ...
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1answer
34 views
Question regarding the trigger circuit for an SCR-based coilgun
I'm an EE student, trying to design a coilgun project. I have had luck with a basic prototype similar in construction to the one on this site, however with smaller flash capacitors in parallel (total ...
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73 views
How to reduce spike in Power Supply and GND (SCR + Ignition Coil)
My circuit:
Signal coupled in power supply (3.3V) of STM32F103 during spark:
Is there any benefit to using this diode (circled in red) or not (without this diode the snubber circuit will start ...
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3answers
123 views
Crowbar Circuit Resistor
I have a crowbar circuit which uses an SCR with 100mA gate current shown below.
In order to use this resistor value at 100mA it would need to be rated for 60W. Obviously here the resistor will pop. ...
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1answer
105 views
What can I use to turn on a circuit at 5V?
I'd like to power an Arduino using a supercapacitor. I already have that part of the circuit figured out.
But I want to charge the supercapacitor using an external power source, without the ...
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1answer
42 views
Why on shutdown the SCR can be compared to a power diode?
I have this as a homework question and can't seem to find the answer in my notes, book or internet. I know they will behave similarly when there is a reverse polarity on both, but the way my professor ...
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3answers
144 views
Xenon Flash thyristor trigger
I'm building a xenon flash unit with a power of 50Ws (300V 1000uF capacitor).
I need to trigger it from a microcontroller. For that I use a MOC3041 to opto isolate my µC from the HV circuit and ...
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2answers
147 views
What happens for the SCR if I connect gate with ground when it is turned on?
When I connected a silicon control rectifier by applying positive voltage in anode and negative voltage in cathode, after that I triggered the gate by pulse voltage and it connected, after that I want ...
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1answer
435 views
What distinguishes an ordinary thyristor from a GTO thyristor?
A thyristor, I know, is a four-layer PNPN structure, with an anode on the first P section, a gate on the second P section, and a cathode on the second N section. This simple structure suggests that ...
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2answers
109 views
Trouble with simulating an SCR
I was reading about SCRs and I'm trying to simulate 2N5060 SCR but having some issues when I plot the currents and voltages:
First by looking at the datasheet, I set the R4 to keep the gate current a ...
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1answer
80 views
Confused with turn on time definition of an SCR
The following question I encountered is asking about the minimum time for applied voltage to the gate of an SCR to turn it ON:
And below is the solution:
I can understand the solution looking for ...
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3answers
93 views
Testing a thyristor
I have a very large high voltage device that a friend asked me to take a look at. It has a bunch of BIG thyristor packages (Semikron, SKKT 106/18 E, Dual Thyristor Module, 600A 1800V).
I'm testing ...
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1answer
75 views
Switch operating at particular touch IC voltage [closed]
Is there any circuit to perform such task more efficiently?
I am trying to control a small motor (like a smartphone vibration motor) with specific outputs from the touch IC, so that it can be turned ...
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3answers
120 views
“Active Low” SCR
Background: I'm working on a circuit that uses an ATmega 328 processor, and a hall effect sensor. We're creating a small wireless sensor, so what we're focusing on now is power consumption. We want ...
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58 views
UJT provides a trigger operation to the SCR
hello everyone i want to know how to solve this problem if anyone cane help me to solve this question i will really appreciate it
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1answer
407 views
Dimensioning SCR crowbar circuit
I need to dimension an SCR crowbar circuit to reach a certain level of protection against overvoltage, without increasing much the complexity of the circuit of my control card. The need is to protect ...
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84 views
What's the best way to detect zero crossing in this design?
The design that I am talking about:
I want to be able to detect the zero point with an MCU of which pin can withstand only 3.3 V. I'll forgo optocoupler because A. I want everything to be as cheap as ...
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1answer
296 views
Thyristor/SCR \$i^2t\$ and \$i^2\sqrt{t}\$ Rating
I have commonly seen the \$i^2t\$ rating for fusing in a SCR datasheet. This is a helpful rating for assessing if pulses which exceed the surge current rating (Itsm) of the SCR will damage it.
...
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1answer
148 views
GTO Driver circuit
i am new to power electronics.I am working in project where input is pulsating dc and i have to control it, i try with scr but we can control only on of scr not off so in some case the cycle cut ...
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2answers
520 views
Ideal component to switch 84V DC?
I wanted to control a 84V LED strip using a ATtiny13a microcontroller with minimal power wasted. I just want to turn it on and off, don't need any PWM dimming. The strip uses 270mA current and is ...
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0answers
387 views
What is the purpose of the SCR in this circuit?
I am trying to repair an old SMPS. The first step is to reconstruct the schematic and work from there on. The schematic on the low voltage side is completed for the +12V and the +5V circuits. However ...
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2answers
104 views
Why Does The NTE5465 SCR In My Circuit Remain Closed, Even With No Current?
See attached circuit. Circuit is designed to have the bulb light, when a very low amperage momentary switch is pressed. In the final circuit, the bulb will draw 4 to 5 amps for a short period of ...
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0answers
213 views
SCR switching conducted emissions
I have a circuit that drives a 240Vac line to line power to a resistive load. I am testing for radiated and conducted emissions. Radiated emissions went fine but conducted emissions failed with "broad ...
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1answer
129 views
How to know if a SCR is still working?
I'm using a TIC116 to control the power over an electric grill. However, I didn't use a heatsink and it got very warm. On the data it says that its upper limit is 110 °C.
I suspect that the gate is ...
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1answer
133 views
Problem with using SCR to control power for an electric grill
I'm doing a power controller for an electric grill, where through PWM I allow to pass x number of cycles from the 124V @ 60 Hz source of my lab.
Here you have the diagram:
simulate this circuit &...
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5answers
2k views
Why are bulky SCR power controllers used when the same can be achieved with a relay?
This is kinda noob question. I recently got an SCR Power controller (WATLOW DIN-a-mite DB20-24CO-0000 Style B). This is the first time I actually got to test an SCR controller for myself. The input ...
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2answers
464 views
Turn-off an scr by a transistor
Hello.
I understand that one of the method to turn-off an scr is by
connecting a transistor parallel to it in order to short it.
I would like to turn on the transistor(BC547B)by touching the wires
...
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1answer
912 views
SCR triggering using DIAC
I've found this method of triggering of the SCR through DIAC and I'm trying to understand it. I was able to figure out the whole trigger circuit and how to compute the values of RC in order to have ...
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2answers
2k views
How to use SCR to control the power of a heater
I would like to point out that I am not an expert (as it is perceived by the question) in the use of scr, diac, and triac and that this question is more for academic purposes than use in real life. ...
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1answer
836 views
Formula of snubber capacitor capacitance for SCR dv/dt protection
I have a formula here for finding the suitable value of shunt capacitance to be put on an SCR snubber.
\$C=\frac{1}{2L}(\frac{0.546V}{dv/dt})^2\$
where L is the snubber inductor, V is the DC supply ...
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3answers
1k views
Wiring for 10000W 220V SCR Voltage Regulator Speed Controller
I live in the US and have the Twist Lock Electrical Plug 4 Wire, 30 Amps, 125/250V, NEMA L14-30P. It has 2 hots, 1 ground, and 1 neutral wire. I saw the following scr controller on ebay and am ...
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1answer
505 views
DC bus inversion to 3 phase AC modified sine wave using IGBTs
I'm working with a variable voltage inverter.
I have 3 phase AC voltage coming in at 480V RMS line to line. It hits a full wave SCR front end, has a DC bus link, and is inverted with IGBTs to created ...
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0answers
101 views
Why does this transformer have an additional winding on the side of the core?
This photograph is of a wire feed welder. This unit consists of a step-down transformer with a bunch of taps on the primary side. It is fed from 115 Volt 60 hz supply. The switch on the left allows ...
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2answers
303 views
Identify a Thyristor
Hello would anybody be able to find the spec's of this SCR Thyristor General Electric C50FX425 937
Thanks in advance.
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1answer
1k views
Is this a good inverse parallel SCR drive circuit?
I have a design for a dimmer circuit, but I am unsure of its correctness or if there are issues with it.
It's meant to be controlled by a 50% duty cycle PWM signal - the dimming responds to the phase ...
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1answer
261 views
Does this capacitor discharge? SCR and capacitor doubts
I'm having some doubts about this circuit and about capacitors charge/discharge in general
SCR CIRCUIT; Igt= 100MicroAmps;Vgt = 0.7V
Ok I have like 5 questions
1) Is flowing current through R2 and ...
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1answer
443 views
How to automatically turn off an SCR after being latched for DC supply
How to automatically turn off an SCR after being latched for DC supply?
Type of switches that turns on/off a circuit with a certain voltage
But when i try it in multisim it doesnt work.
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1answer
2k views
How do I find the firing angle of SCR practically? [closed]
Our teacher told us to find out the time period and then multiply it by 18.Then 180-(∆t*18) gives firing angle.Why 18 as a multiplier?
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3answers
775 views
SCR fail safe protection
I would like to use 2 SCRs in antiparallel configuration to control the power to a all resistive load (20A) using 240Vac (line to Line). Pretty typical configuration and part of a lot of SCRs ...
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1answer
633 views
SCR circuit falsely triggered during capacitor charging
I am building a coil gun. Above is the complete schematic of the voltage boost circuit plus the trigger circuit.
Not shown in the schematic, there is a push button switch between the regulated +9V ...
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4answers
446 views
Verification of SCR Driving Circuit
Several years ago I attempted to build a coil gun, but gave up in frustration after burning out several SCR's when designing the trigger circuit. The SCR is used as the switch that dumps the energy ...
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1answer
189 views
Cycloconverter , MOC3021 problems?
i am doing a cycloconverter single phase design and i have a problem , i use microcontroller to control the firing angle ,i have used zero crossing voltage (741) to trigger INTERRUPT port of MCU , i ...
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1answer
724 views
LTSpice Simulation Problem - Controlled Rectifier Single Phase Dual Converter
So I am having problems simulating a Single Phase AC/DC Dual Converter on LTSpice. At the first converter I am getting the perfect output but when I take the voltage probe from the second converter ...
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1answer
492 views
Why is that the gate current cannot be negative for SCR?
Why is that the gate current cannot be negative for SCR ? If the gate current is negative it should only increase the breakover voltage , why is that the SCR does not work ?
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2answers
582 views
Precision control of current to an inductive coil (coilgun)
I have students building a coilgun. At first they used a manual switch, despite my suspicion that it would not switch on cleanly. After looking on the oscilloscope at the trace of a one shot, we can ...
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2answers
2k views
SCR Gate to negative
Is a short circuit that occurs for as long as an instance safe?
In the following schematic done from here, I have a silicon controlled rectifier that is used as a latch (the circuit simulation doesn'...
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2answers
555 views
thyristor equation
I know how does an I-V curve of a thyristor look like, but is there any thyristor equation that can represent the curve?
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1answer
3k views
How should I step down 220V (ac) to 180V for a DC motor?
I have many treadmills motor of rating 180V 10A which I would like to use for power tools. Locally we have 220V ac 50Hz.
I thought of using iron-core transformers. But having one for 1800W+ is ...
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1answer
1k views
Is it possible to replace a DIAC circuit with an SCR circuit to drive a TRIAC
I have a triac DIAC cirtcuit. I don't have any DIACs on hand, but I do have plenty of TN1215s. Is it possible to generate the required pulses using an SCR to drive the TRIAC's gate?
