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Results tagged with zero-crossing
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user 2064
Zero-crossing refers to detecting the point at which a sine wave reaches the zero point of magnitude. In AC circuits it corresponds to the point at which no voltage is present so switching at that point reduces interference.
11
votes
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Difference between Zero-Crossing Optoisolator and Regular Optoisolator
Zero-crossing is typically used for incandescent bulbs. You may have noticed that when incandescent bulbs fail they always fail when they're switched on. That's because the mains phase can be near its …
- 147k
7
votes
detecting zero cross in ac?
Why not use an optocoupler? Vishay's SFH6206 has two LEDs in anti-parallel, so it works over the full cycle of the mains voltage. If the input voltage is high enough the output transistor is switched …
- 147k
6
votes
Accepted
How to use a phototriac coupler to trigger the main triac?
It's for on/off control only. After the opto-coupler sees the LED going on it waits for the next zero-crossing of the mains voltage, at which point it switches on. After switching off, like any triac …
- 147k
12
votes
Accepted
How do I read a datasheet for a solid state relay?
This type of opto-triac is mostly used in mains voltage applications. Due to the limited current capabilities it's often used as a driver for a triac which is the actual switching device. Your require …
- 147k
4
votes
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What does 'random phase' means in a triac driver?
Yes, it means it doesn't have zero-crossing detection. The latter is useful for purely resistive loads, where the current is in phase with the voltage. For reactive loads, inductive or capacitive, thi …
- 147k
7
votes
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120VAC 60Hz Zero Cross Detector
Why not use an optocoupler? Vishay's SFH6206 has two LEDs in anti-parallel, so it works over the full cycle of the mains voltage. If the input voltage is high enough the output transistor is switched …
- 147k
56
votes
Accepted
How can I detect a power outage with a microcontroller?
Since you also need the zero-crossing you'll get the power outage detection virtually for free.
Best is to use an optocoupler to detect zero-crossings. Put the mains voltage via high resistance resist …
- 147k
14
votes
Accepted
Digital Dimmer With Microcontroller
In the answers to this question is explained how you can do that complete zero-crossing detection circuit with just U1, R12 and 2 series resistors on the 220 V side. One solution uses a common optocou …
- 147k