Questions tagged [switching]
Switching can be defined as the change in state whether it be an analog, digital, or mechanical device. For digital devices, switching can be defined as a transition from HIGH to LOW or vice versa. For analog devices, switching can be defined as a change of operation within a transistor. Mechanical device examples include physical light switches or button switches. Ultimately, switching interrupts current from going into another conductor path.
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Reducing the fall-time of a P-channel MOSFET Follow-up
The original question
Answer by Simon Fitch
Please refer the original question link and the suggested answer by Simon fitch
I have implemented in hardware as it was recommended. I gave 15Vdc supply. ...
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Using of TVS diode in series and parallel
I know that TVS diode is used for over-voltage protection and spike dumping.
In switching system for normal condition what would be at the capacitor's positive terminal(Vout) if TVS1 is "P4SMA75A&...
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Automotive MOSFET active clamping circuit - LC ringing between coil load and MOSFET gate?
I'm trying to design a circuit equivavlent to fully clamped automotive MOSFETs (like the STP62NS04Z) using discreet, cheap and readily available IRFZxx MOSFETS. The goal is to drive a high impedance ...
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Need help applying the charge conservation principle [closed]
I need help deducing the expression of output voltage as a function of the relevant circuit parameters (v_in, f_clk, c_fly, c_out, r_out). I do know that the charges associated with r_out are defined ...
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Improving MOSFET switching timings (push-pull)
Based on my previous question here, as suggested I'm using a push-pull driver circuit to control a MOSFET gate.
this is the circuit:
And this is a simulation result:
Vertical Divisions are 1 V, ...
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How do I simultaneously distribute a GPIO 3.3V logic signal to a batch of identical devices with 1.8V input
I'm asking how to distribute a 3.3V GPIO output logic signal onto many IDENTICAL devices that have 1.8V input. The first device is no more than 4m from the MCU. Each device is tapped (wired in ...
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Priority power switch - capacitor placement and DC-DC at the output
I am building a PCB using the TPS212x IC to switch between the highest Vin available at any time (3.8Vbat or 12V solar panels). At the output of the TPS212x, I am placing a MP28167 DC-DC automatic ...
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Will the gate driver circuit of MOSFET work?
I have implemented this circuit in the hardware. The desired pulse output across 2 Ω is 28 V output, minimum 10 A output current with 100 kHz frequency and 10% duty cycle. The drain pulse is not ...
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WCCA analysis - Induction selection - Mismatch with recommendation at low current values
I'm performing the WCCA analysis of a 3.3V buck regulator(AP64200Q).
Datasheet: https://www.diodes.com/assets/Datasheets/AP64200Q.pdf
In the current circuit:Vin=24V,Vout=3.3V,Max.current=300mA so ...
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Class D amplifier safety
This is my first time I had success in doing a class D amplifier. Earlier attempts was on prototype boards with bad layouts. This time I made a good layout considering parasitics and it works good ...
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How to make a power switch using MOSFETs?
I am stumped on trying to create a circuit that, through an enable of 3.3V will let +18V go to the load or prevent it from doing so. This is my current approach. I know the pullup resistor should not ...
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Bipolar NPN transistor does not work as expected in simple circuit
I need simple button in Raspberry circuit to force wake up on GPIO3 which is shared with I2C and shutdown on GPIO4. So I have cascade of inverting NPN bipolar and MOSFET. The circuit is pretty simple.
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Mosfet Switching Energy
How can I calculate the energy required to switch a Mosfet knowing the peak power, and the drain to source capacitance?
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Identifying GDS in MOSFET diagram
I would like to switch an analog signal on and off at 10 kHz using an Arduino microcontroller. I have found the below diagram which shows a MOSFET used for switch analog signals. In place of the shown ...
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I need to energize a 25 watt incandescent bulb. When that bulb burns out another 25 watt incandescent bulb will energize
I need to provide a small amount of heat to my downstairs sink when we are away for the winter. A 25 watt incandescent bulb is fine for the job, but last year the bulb burned out at some point. I want ...
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Inverting MOSFET drive circuit, is my scheme correct? [duplicate]
I am an automotive engineer student, building an inverting MOSFET driver (where a MOSFET drives and controls another MOSFET, Vin low -> Main MOSFET closed, Vin high -> Main MOSFET open).
My ...
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How does one switch a low power circuit using a high(er) power circuit?
This question is the logical conclusion of answers I received to this question, this other question is similar but doesn't address much of what I will ask and really goes nowhere.
How can I switch a ...
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Long falling edge of a VCSEL laser's pulses
I've been trying to drive a 940nm VCSEL (Part No. V105Q131A-940) with an iC-Haus HG20M VCSEL driver. When given short pulsed signals (pulsewidth of ~100us), the optical signals detected by a ...
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Switch on resistance
I already spent quite some time looking at the forum's search feature, but cannot seem to find an answer. My challenge is the following, I have two batteries that are joined or separated by a switch. ...
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Can a 24VDC operated DPDT relay operate in a circuit that has 1000VDC?
Essentially, I am trying to come up with a circuit to automatically switch cabling configuration for a hi-pot test.
The DPDT will only be switched when the circuit is not energized using a separate ...
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Relay not switching
This is a relay circuit I am using. I got the PCBs and the relay is not switching. After debugging, I noticed that one terminal of the relay is not going to 0V while the other is 5V. It stops at 2.5V ...
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Practical Considerations for a Square-Wave Inverter [closed]
I'm hoping to understand some practical considerations for a square wave inverter.
Particularly, is there additional circuitry I need around the transistors to ensure proper operation? (e.g., ...
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Help with relays and spot switches
I’m working on a shuttle bus and need help wiring the doors to open and close with the limit switches acting as stops (all the way open, and all the way closed). Stupid me cut out the old wiring, ...
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Using MOSFET to switch dual power supply with common ground as a PWR/GND DPST switch for each power line
I have started a new project, an automatic firing system for fireworks, powered by 2 lead-acid batteries (12V). The batteries are connected in series with a common ground (GND), so the power ...
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Converting a fast-switching 0-2.5V input to TTL signal
Dear fellow engineers,
I am attemping to convert a fast switching (~ns) 0V - 2.5V pulse from FPGA into a TTL-standard (0V - 5V) signal. I have been browsing for voltage regulators online. Most of them ...
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Need a support to find out "how fast the MOSFETs (Sie882DF) can switch"
I am using Power MOSFET from Vishay part number Sie882DF to operate at linear region, Following are the steps I have followed to determine the switching speed,
Datasheet electrical spec:
Sie882DF ...
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How to switch a 200 Vpp AC signal @ 2000 Hz in under 1 millisecond?
I want to switch a ~120 V AC signal with a frequency of up to 2000 Hz.
For my application (driving electrolumnescent wire) it is important that the switching duration is not higher than about one ...
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Do any power loads require both power lines disconnected by the "off" switch?
The typical approach to interrupt the flow through a circuit is interrupt it at a single location as in the left image.
Do any power loads require both power lines disconnected by the switch as in the ...
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Dual Power supply switching
I have two PCBs: PCB1 and PCB2. Both PCBs have a 5 V power supply connectors. Both PCBs are also connected with each other via extension connector. When 5 V connector of PCB1 is supplying power, then ...
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Bootstrapping circuit vs. charge pump for high side switching
I am designing a circuit where I need to do some high side switching to turn on/off the power to a circuit (part of some protection circuitry). This switching is actually very slow and only occurs ...
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Roughly estimating MOSFET gate current
I am trying to check if I've appropriately sized a gate driver for a SIRA50ADP-T1-RE3 MOSFET.
The fastest it would expect it to switch is at ~20 kHz and the driving voltage (Vs) is 10V. From the ...
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Why does series-NMOS gate drive current affect the load, and how do I avoid it?
TL;DR: With two nMOSFETs in series, why does the load experience current spikes during switching times of one transistor even when the other is off - and how can I avoid it?
Consider the following ...
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Trade off between output ripple and switching frequency for DC-DC converters
DC-DC converters datasheets generally specify their output ripple and the switching frequency.
From what I understand, the output ripple goes down as the switching frequency goes up.
When using a ...
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Unknown DC-DC topology
I am working with a BMS that has a daughterboard attached that I assumed was a DC-DC converter but now I am not so sure. Here is the broad circuit overview that I have derived:
simulate this circuit &...
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Active Half-Bridge Driver Circuit
Consider the folLowing half bridge circuit:
I'm designing a half-bridge circuit to be controlled by a microcontroller. Ultimately, there will be 3 copies of this circuit for an ESC. I am hoping to ...
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Understanding MOSFET switching
I have got an optocoupler to isolate two circuits. One signal would be trasmitted to the other side using a MOSFET and a optocoupler. The scheme is similar to this:
The Vin voltage signal is a 3.3v ...
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Dual supply circuit
I am designing a circuit with 2 48V power supplies to feed a load. My goal is to give priority to Supply 1 when available since I need the load to be fed by only one supply at a time. This is what I'...
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High gain op-amp, but still being able to get 0V output
I'm not a learned electrical engineer, so all my knowledge is self-taught and thus a little spotty. I hope you guys can help.
Here is my problem:
My goal is to switch between ROWPIN 1-4 (there are ...
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Switching a single high-power DC source between six loads - via relays?
I need to route DC power from a single rack power supply (Keysight N5766A) to six different loads, with the capability of switching between them independently and unshorted (break-before-make) via a ...
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Best switching topology for axial stator with rotating field
The idea is to have a stator with coils driven by AC current not switched with DC as is done in most cases. On top of that I need the field to physically rotate around with the rotor. This essentially ...
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4 mosfets inverter circuit low output voltage problem
I have used the mosfets as a switch to generate a simple square wave at the output. Taking the concept from the simple switches if there were switches instead of the mosfets as shown below then we ...
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Zero Voltage switching
I am having confusion regarding the understanding of Zero Voltage switching as given in the website.
What does the ZVS do in the circuit shown below? Does it produce a sine wave or it just makes the ...
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Resonance inverters and pulsation frequency
I was reading one of the patents for the x-ray generator when I found a resonance inverter attached in front of the switching circuit. I understood how the system works but one statement written is ...
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Can a buck converter functioning in CCM have non-linear behaviour at light load currents?
I've been designing a Simulink/Simscape model of a TI buck converter launchpad (https://www.ti.com/tool/BOOSTXL-BUCKCONV) and I'm trying to have my model fit the behavior of the device.
The board can ...
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What characteristics should I be looking in to choose a MOSFET?
I have an application which I need to switch a 1000 W 24 V 40 A inverter on, and I do need a way to switch it on with a MOSFET (I don't understand the way how to choose it properly) although in the ...
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Are the full bridge rectifier on a IGBT pack switching, fast or Schottky diodes? [closed]
In a skiip24nab126 IGBT pack for motor VVF drives: are the 3 phase full bridge rectifier diodes fast Schottky or switching or just normal / common diodes like 1N4007? Does the rectifier need to switch ...
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Why can’t I find fast transistors and same fast diodes?
I am trying to make a 30 GHz 32 (or 64 bit) counter on flip flops.
Ready counters do not satisfy me due to max frequency and price, so I decided to make it on my own from flip-flops.
Ready flip-flops ...
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Part guidance: Switching 120 VAC @ 3 kHz in < 5 ms
I want to control electroluminescent wire, which runs at 100 Volts AC @ 1000 to 3000 Hz, with a desired switching delay of under 5 ms. I have used Sparkfuns products in the past, but they are no ...
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Is my relay logic practicable?
I am trying to apply relay logic to control my machine. The schematic is as shown.
'R' is a relay.
Please note that my schematic symbols may not be the symbols used in industry.
Wanted outcome: ...
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How could you make a polarity-switched electromagnet at home?
For context, I have lots of electrical parts and I am looking into ways to make a small polarity-switched electromagnet out of the parts I have. I can Information on the parts I have if needed. If ...
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