Questions tagged [mains]
Mains electricity, typically a higher voltage AC waveform used to deliver electrical power to households. In North America 120V, 60Hz, in most European countries 230V, 50Hz. What most people will plug appliances into.
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What is the advantage of the L0103DE triac versus two SCR's wired back to back, and how can the reverse-gate-current turn-on for Triacs be determined?
Following my LTSpice simulation of the L0103DE triac:
I see that this Triac appears to act just the same as two SCR's wired back-to-back (see its datasheet link here).
I am a little bit confused by ...
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Confused with a DPST mains switch
I'm planning to use a DPST rocker switch as follows:
To be more explicit I want to use the switch as follows:
Both wires to the DPST SW above will be line wires not neutral. The switch is from here ...
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What physical package size is needed for gate resistor on triac with AC Mains
I have been learning about clearance and creepage of AC PCB design. I need to add a gate resistor to my triac which will drive a insertion heater component.
I am thinking I can use an 0603 size for ...
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Simplest Way to Measure Line Voltage with Passive Probes
I know disconnecting earth plug of oscilloscope is viable way to measure Line voltage with passive probes. But it is a hassle to prevent and un-prevent Earth connection for each time I make a quick ...
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Lowest triac dimming possible without a microprocessor
The usual triac dimmer circuits cannot fully reduce power to zero. The diac trigger voltage can be lowered below the typical 20V (for 120Vrms US mains power), and the RC time constant can be ...
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EMC requirements for cable trays with shielded cables only
We have installations with several powerful motors and transformers (up to 2 MW) which are driven by VFDs. Due to some geometric constraints the VFDs can't be placed near the motors.
To minimize ...
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How do you search for a "power brick" with a grounded negative output
I've worked on several projects that use an external power brick for power, which also require an earth ground connection.
This can be accomplished by including a special grounding terminal, but many ...
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Looking for Reference Circuits that Use Supercapacitors
I’m looking for schematic references or design examples to understand how supercapacitors are typically integrated into electronic circuits.
I want to use Supercapacitors as a power backup for ...
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Should I use tracks or copper pour for mains line connection between two points?
I am designing a relay PCB for an application rated upto 16A. The space is a constraint for me so for better connection, I used a copper pour for the line on the top layer and neutral on the bottom ...
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Will PC817 be able to handle inrush current on startup in capacitive dropper circuit for mains detection?
There is an one watt 1K resistor in between the broken terminals. I could not show it because not able to find the part number.
The unpolarized capacitor is 100 nF and X2 rated.
The circuit will be ...
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Load Side vs Switch Side Snubber for TRIAC
I want to switch AC ventilation fan and several LED bulbs with a custom made Solid State Relay. Line is 220VAC and max current will be 2A. The fan won't be bigger than 150W. The loads are not exactly ...
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How does on grid inverter send active power to grid
How does the on-grid inverter send power to the grid?
Like for direct current, the power goes from the higher voltage to the lower voltage. For reactive power in alternating current system that is ...
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Higher electric field when going off-grid
With an oscilloscope and a 1 m wire at the probe for electrostatic induction I measure 50 Hz electric fields from my mains at a fixed spot in my house. I model reading voltage V_1 at my oscilloscope ...
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What happens if I connect two grounds together?
Today I just learned that the neutral wire is bonded to the grounding electrode rode. However, this raises a potentially naive question on my part (very rudimentary background in electrical ...
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LTC4412 STAT always low
I observe strange STAT behavior at LTC4412ES6. It is always low, no matter which power source is attached or not attached (measured the voltage on STAT pin). As you can see, there are two possible ...
