Welcome to AAC. No, unless there's a property of bridge rectifiers I'm unaware of, this will not work. Bridge rectifiers as well as rectifiers in general work in one direction only.

1. Diy Led Driver With Pwm
2. Fan Pwm Mode

MOSFET controlling fan speed. So if I apply a 5V PWM with 50% duty cycle to the gate of MOSFET it will turn. Use some gate driver. Also be sure to use a fan.

They are used to rectify AC to DC. They will not allow you to use DC to control or vary AC. Look here for more information: To change the speed of a single-phase AC motor - I assume that is what you have - you need to change the frequency.

In the U.S., a single-phase, 120VAC motor operates off of 60Hz. However, as you decrease the frequency, the motor will consume more current. We attempted to power a 60Hz motor with 50Hz at work and if it wasn't for the thermal fuse, the motor would have burned up. Before attempting to build a circuit to change the speed of an AC motor, do some research on single-phase AC motor speed control. In the little research I've done and past experience I've had, I don't think you can safely change the speed of a single-phase AC motor by much, if by any at all. Three-phase is a different story.

Well, I think this might actually work, because this is not a standard bridge rectifier, it is more of a 'shorted' bridge rectifier. You don´t say anything about the target voltage, but plese DON´T use this with mains electricity. Even though there is the optocoupler to save you from a nasty shock, the transitor will die in a spectacular fashion if you connect it to 120 or 230 Vac. I would place the zener before the the opamp and mosfet, so that you have a stable 15V rail which you then switch to the mosfet.

The zener in your configuration will probably be too slow to keep the mosfet from dying. Also the optocoupler in your configuration is subjected to 320Vdc when off and will die as well.

Click to expand.As kubeck noted the circuit shown could work. The bridge output is DC but the input is AC and the input of the bridge is in series with the load. Thus the MOSFET on the bridge output will rather act as a variable resistor in series with the motor. It's similar to varying the AC voltage to the motor, which is not the best method of controlling fan motor speed but is often used. It's similar to used a Triac type lamp dimmer to control the speed.

A Triac would be more efficient than the MOSFET but often causes noticeable motor noise due to the high frequency harmonics generated by the Triac switching. One thing to note is the the MOSFET could be dissipating a fair amount of power, depending upon the amount of speed reduction so it needs a good heat sink. Click to expand.I'm still lost on this.

So the bridge rectifier, as it is shown, is in series with the load. It is somehow acting as a switch to complete the AC circuit going to the load when the MOSFET effectively shorts the DC output? So, if you connect an AC load in series with a bridge rectifier and short the DC output, the bridge will 'safely' act as a closed switch and complete the circuit to power the load? Is this an acceptable or common practice or one of those it could work but there are better ways? For my own curiousity, what type of circuit or control would you recommend to control the speed of a single-phase AC motor? For a DC motor, speed is controlled by voltage, roughly speaking. For an AC motor, speed is controlled by frequency.

At least, this has been true in my limitied experience.

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