So figure, why hasn't the MOS switch conduction, as long as a 220 v ac, can output to 190 ~ 200 v ac voltage, MOS switch conduction, the output voltage of turn into a 220 v, total felling the MOS switch control is no problem, why haven't switch is opened, output voltage output will have? O great god teach

CodePudding user response:

As communicate directly with bidirectional thyristor or relay or solid relay!
This circuit is your design? Can you name design reason, and current flow?

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reference 1/f, the wise know already should good karma response:

is inferior to communicate directly with bidirectional thyristor or relay or solid relay!
This circuit is your design? Can you name design reason, and current flow?

why not can... Photoelectric isolation, and then through the high power double MOS, double the mis is to prevent parasitic diode reverse leakage,

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reference 1/f, the wise know already should good karma response:

is inferior to communicate directly with bidirectional thyristor or relay or solid relay!
This circuit is your design? Can you name design reason, and current flow?

ask why will appear this kind of circumstance, the withstand voltage value of type double Nmos is up to 650 v, also won't breakdown what

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How you put the alternating current (ac) positive and negative half cycle current flows through a pipe with arrows painted?

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The negative half cycle is to drain of Nmos

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reference 4 floor wise men know already should good karma response:

how you put the alternating current (ac) the positive and negative half cycle current flows through a pipe with arrows painted?

elder brother can answer my question? Have been asking me

CodePudding user response:

You the above description is clear, and 2 in series in order to prevent parasitic diodes in one and a half weeks conduction uncontrolled
But you don't know how to use this device, see figure

Take a look at your light coupling electric polarity imposed what tube voltage, can make the pipe work normally? To use the device at least to understand its conduction condition!
In fact to make parasitic diode does not affect the circuit control, as long as add a bridge pile can, using the second field effect tube is more economic than you,
Analysis of the current flow is easy, set for L + pipe above the parasitic diode conduction, output through pipes under the load to exert working voltage, however, what is your design of the control voltage at this time? When L was in turn below a pipe through the load through a parasitic diode conduction right?
It is want you to tell you is how to control the pipe,
Circuit due to the existence of the parasitic capacitance may produce conduction under high pressure condition,

CodePudding user response:

Assume that it might be a virtual voltage is measured with a digital multimeter, measure the voltage and load to see if your circuit according to your design intent to work normally?

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If normal, it is 220 v ac output terminal, electric fan, I give it a load difference and then use the oscilloscope probe measurement, MOS switch conduction, load two paragraphs still can measure voltage, but the voltage with fixed electric fan load and about 190 v, and the output of the MOS after conduction voltage can make the fan operation

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If VGS voltage has to be low, MOS output capacitor leakage, around 1 w output by one of the dummy load resistance, use multimeter test again, there should be no voltage,

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Brother, you this can be achieved 220 v to adjustment SCR power supply or tungsten filament lamp? I recently in a such a scheme, seeks to share

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I have copied hand the MOS tube on the back-to-back control circuit, to study together? I don't understand

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Hi, I'm looking at a similar circuit, like you, I want to ask, the source of the MOS tube after the grounding, how through the last MOS pipe the output ac voltage pole, middle source here to pick up the ground, alternating current (ac) does not directly LiuXiangDe? The alternating current (ac) are not familiar with,

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Newly designed circuit

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Should solve the problem of the building Lord, I have recently encountered this problem, but we don't, the application of signal we do cut and disconnected, back-to-back double mosfets exists the building Lord said this phenomenon, just don't let the MOSFET conduction, still can detect voltage on the output end, but it is coupled to voltage signal, it can hardly transmission power, can't even light up when closing a few watt light bulb, so don't worry, you can achieve your cut to 220 v voltage and disconnect,

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To the MOS can reverse?

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Directly using relay would be simpler and more reliable!

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VCC1 and VCC2 is 220 v ac input?

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reference zxcvbnm_007sss reply: 3/f

Quote: reference 1/f, the wise know already should good karma response:

is inferior to communicate directly with bidirectional thyristor or relay or solid relay!
This circuit is your design? Can you name design reason, and current flow?

ask why will appear this kind of circumstance, the withstand voltage value of type double Nmos is up to 650 v, also won't breakdown what

I heard an eagle in the sky will not to catch frogs in the water, the mountain tiger won't go to catch the carp in the river, this is because the benefits than cost,
If your current is controlled in 1 a, double Nmos price is about $2, the cost of the relay is around 0.8 yuan, with the cost of 2 yuan can realize the function of 1 yuan, isn't it strange?

CodePudding user response:

The ground painted has a problem,

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Just look at the circuit think it's too complicated, also is to rely on two opposite tube series of switch, alternating current (ac) and a half weeks through a pipe of a parasitic diode conduction + another tube conduction channel formation, if the pipe pressure enough, it should be said leakage current is very small, but, after all, still has a small leakage current measuring voltage meter inner resistance is known to all as far as possible big, the internal resistance of measuring current as far as possible little. Therefore, the possible reason is caused by the leakage current measured voltage, or the pipe pressure is not enough, in fact two pipe pressure to achieve the same 400 can't halve, two tubes to control corresponding to zero also needs corresponding to the positive and negative half cycle, so feel instead of encumbrance, direct control is better than a pipe is simple.

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Another is such a circuit design need another power applied to the grid, more trouble.