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28 Threads found on Mosfet Fan
Guess what? The fan will not keep the mosfets cool. It will keep their temperature lower than without the fan but they will still get hot. Guess what? The Rds rises as the mosfets get hotter that increases the Rds more that increases the temperature more that increases Rds more that increases the temperature more.... thermal (...)
I need help in editing/merging the code for PIC12F675.I have two codes 1. Ultrasonic driver for anti fouling of boats 2. mosfet Heater fan speed Control The second one is a PWM controller The first generates a burst tone swept between 19.08kHz to 41.66kHz with a pause. How do I lower the range to 1KHz to 15 or 20KHz without any pause at 3 cycl
There is no such device as a PIC16F62A so I'm assuming you mean a 16F627A or 16F628A which are almost identical to each other. 1. CCP1 (=RB3) is the pin producing PWM output. Use it to drive a transistor, preferably a mosfet in series with the 12V supply and fan motor. 2. Tricky if you use a potentiometer because the 16F62xA does not have an ADC
If you mean an N-channel mosfet in the low voltage (ground side) of the fan, connect is source to ground, drain to the fan and gate to source through a 10K resistor. The connect the optocoupler emitter to the gate and it''s collector throgh a 1K resistor to +12V. No capacitor is needed. It might be useful to connect a diode across the (...)
make a drive... by varying frequency you can control the speed u can use pwm ic like SG2535 IC or microcntroller and use igbt or mosfet for h bridge inverter. also try with triac.. ceiling fan speed is controlled by Triac
most likly the controller not able to source that much current ideal for motor to run.. apply the schematics first...
i want to switch on and off a dc fan using mosfet depending upon lm35 output. so i build the below circuit, but it does not work. can some one please tell what i am doing wrong? op amp pin 2 is at 0.25v and pin 3 at 0.32v R11 is not connected. VCC is 12v 106839
Most home ups have a cooling fan which will keep the mosfet's cool. Computer ups dont have this option. Not only transformer the whole system(computer ups) was designed to work only for few minutes (say 20 to 30).
I used IRF840 instead of the shown mosfet but the mosfet is heating up after a few seconds. ( I am driving an exhaust fan)
Hi, thank you for a reply. I assumed V(BR)DSS is the maximum voltage between drain and source before mosfet fails. So supplying 9-15V to drain of IRF2804 would be ok? With gate voltage, I would need a device to have PWM voltage between 2 and 4V to meet the specification.
You can use some temperature sensor ICs with I2C interface which can be placed on the monitoring region & you can turn on/off your relay/mosfet according to the temperature reading. You can use a fan also for lowering the temperature fast.
I am trying to use 4 mosfet tansistor to build a H-bridge to control the motor. The input voltage should be 12V and 1A. Can any one suggest which mosfet transistor is suitable for the circuit. Thanks 97961
Use L293D motor driver IC. U can directly give MCU output as input to this and it will drive the motor. U can also use this in Push pull mode, configure it as H-Bridge driver. 88138 On the other hand, u can use power mosfet in H bridge configuration for motor on off. And also can provide PWM to mosfets to control the speed
looking in your LL110 datasheet, it shows Vgs = 5V. If your microcontroller output is +5v, then only it switches the mosfet compelety ON. So i recommend you to use a npn transistor and mosfet to power up the fan. connect output from uC pin to base of NPN transistor with a series resistor, and more than 5V(say about +6V) to collector, and (...)
Hi all I have the mobo GA-8N-SLI-royal and i would like a help. The problem: I connect the 24 power supply connector, the ATX 12V 4 pins connector, and the 12V/5V 4 pins connector. I took off the CPU and all the RAM's, I/O cables etc. The CPU fan blower in connected. Then i push the power button and the Q23 (mosfet K3918) starts boiling the
Probably turn off is too slow, which makes for large currents and large Vds on the mosfet, hence lots of dissipated power in the device.
How many phases are there in your motor? You can drive your BLDC by a microcontroller and a power electronic circuitry its no doubt but only if you microcontroller is generating suitable pulses . The name BLDC ia a misnomer as it is said it need electronic communtation you are providing electronic commutation by your pic. It is said as BLDC becaus
I am using ccs compiler. an example. //this is a little test PWM program to drive a DC fan. // the fan allready has some control circuit built into it. //I susspect it has PIC and mosfet controlling it. //Some have been failing on site so I need to test it in the workshop. //The fan manufacturers specified the (...)
Hello, I beg to know what is the maximum dissipation (Watts) of a TO220 or TO247 mosfet attached to a heatsink of any size , where a fan is NOT needed? In other words, what is the dissipation level in a mosfet, where any size increase of heatsink provides no further cooling improvement , and a fan becomes necessary? (...)
i am designing a nand, nor, etc logic circuits(mosfet) using cadence @ 32nm technology.what should be the appropriate capacitive load that i have to use corresponding to fan out of 1?..............please give some links to read about this
HI........................ my main problem is the power supply of the rotation part i use a PC fan 12V dc i tried to build an air-core transformer 100 wounds on primary coil , 400 wounds on secondary coil ,12V dc supply voltage and 200 Khz on the gate of mosfet transistor (IRF640) on secondary coil I get about 25vdc (after the diode and the
fan/motor details 57351 as the title suggests I am planning on using a mosfet driver to control a dc fan/motor, have no idea what kind I need to do the job, there are many different types fan/motor will run 24/7 365 days ..possibly for several years fan/motor will run continuously and vary between (...)
Depending on whether the mosfet is NMOS or PMOS. NMOS is used for pull down network. PMOS is used for pull up network. So, gate is from 7407, Power to Drain and fan to Source, the other terminal from fan will be connected to Ground. Gate = The control of inversion layer. This inversion layer means the electrons/ holes generated that (...)
You didnt mention what type of inverter it is. Mean wether it is a transistor based one or mosfet based one?. Usually this problem is caused due to loose windings in the output transformer OR the feedback section which monitors the output OR the distorted waveform. Cheers
Hello respective members of the forum, I have one problem and hope that anyone here can help me solve it. My problem is about automotive mosfet resistor/regulator for the blower motor for mercedes E class. This resistor is dead. I am interested what type of mosfet resistor is it and is there a replacement for it. The purpose of that dead one is t
Hello, I just broke 12V-220V inverter by powering to the 220V outlet. It smoked and spartked. I opened inverter and found out one array of two IRL2203N mosfet arrays to be exploded or burned. Now I replaced those broken 8 mosfets with the same parts, but in the meanwhile I broke the connected small chip by the pliers while detaching the sold
Microcontroller => PWM => mosfet => fan .. See this website for more details: Regards, IanP