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Old 11-25-2013, 03:19 PM   #1
gadavis
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Default MOV and Mosfet

How about some of you electrical gurus translating that into layman terms for us lesser knowledgeable people like me! Thanks. Gene
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Old 11-25-2013, 04:15 PM   #2
kellybell
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Default Re: MOV and Mosfet

Mov is a cheerleader from Paduka and Mosfet is her sister..........
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Old 11-25-2013, 06:10 PM   #3
JohnnieB
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Default Re: MOV and Mosfet

Quote:
Originally Posted by gadavis View Post
How about some of you electrical gurus translating that into layman terms for us lesser knowledgeable people like me! Thanks. Gene
MOV = Metal Oxide Varistor

Basically, when the voltage between the two leads exceed a predetermined voltage it starts conducting.

Typically used for electrical spike protection in AC line powered devices.
Granted, they are found in some earlier controller carts, but I have no idea why since they serve no practical purpose that I know of in a low voltage DC device.

MOSFET = Metal Oxide Semiconductor Field Effect Transistor.

A field effect transistor is works something similar to stepping on a garden hose. When you step on the hose, it collapses and no water flows, lift your foot and the water flows again. In essence, your foot controls the water flow, but never comes in direct contact with the water.

In a regular bipolar junction type transistor, base current flows, but not so in a FET. When turned on, they have very little resistance and when turned off, the have very high resistance, and they can be driven from one state to the other quickly, so they make good switching devices.

Several MOSFETs connected in parallel to increase the current carrying capacity, are used for the control element in a golf cart controller. They are turned on and off around 18,000 times a second and each time they are on, they connect the battery pack directly to the motor. The amount of current the motor is allowed to draw is determined by how long the MOSFET stays on each time they are switched on, which is the duty cycle.

They output to the motor in DC carts is actually PWM (Pulse width Modulated) DC.
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Old 11-26-2013, 03:37 PM   #4
Volt_Ampere
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Default Re: MOV and Mosfet

DC Chopper controllers often have high voltage spikes on turn-off due to the inductance of the windings they are driving. There is a "snubber" on there to reduce the spikes and sometimes there may be a MOV but they are not designed to take lots of spike energy.
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Old 11-27-2013, 10:33 PM   #5
gadavis
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Default Re: MOV and Mosfet

Thanks guys for this lesson in electronics and terminology. Gene
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