Pwm 2n3055

Okay here is the basic issue. (image of current design on bottom) I have 555 timer pwm multichannel board and I blow MOSFETs like crazy. So I have imposed a Voltage limiter for the pwm but still blow the MOSFETs. So the I went to redesign that . I have new MOSFETs that are 12v 75A each. With single current flow configuration. So does

i need some one to help me choose a transistor type for h- bridge control of dc motor if the dc motor rating be between 12-36 volt , so what kind of transistors can be used? see the link i need the types of q1 q2 q3 q4? ---------- Post added at 19:42 ---------- Previous post was at 19:40 ---------- i n

Oldman, I have designed motor controllers in the past. You should pwm at 25-28KHz. Anything greater than that will not be very efficient. Anything less, you?ll more than likely get your audible noise. ST has some pretty good information. Good Luck, Stallion

I would recommend to connect to your 555 a smart MOSFET that Infineon makes. They are protected against overcurrent (if your lamp goes into short-circuit), against overvoltage, overtemperature etc. Infineon do have many to choose from that will suit your requirements on low conducting resistance of the MOSFET. Also, keep in mind that if you wil

these lightbulbs are a con and the light gives you megrains it is so simple too pay 10 % of the cost of 240V 50 HZ ac think about it ac is 1.707 * rms value so simply add a bridge rectifier {25 amps 500V !!! watch the piv high as possible please!!!} and dim this instead with just a good quality remote con

I think we are missing the basics here. A higher freq pwm signal has to be passed thru a low pass filter to recover the sine wave info in it. Try it.

srikanth_alur, you no need a tapped transformer for that, an 12v-0v-12v to 230v transformer will do the job. check the transformer ratings, colis used and core used it will effect the output. my first 100W inveretr i used 12-0-12v to 230v transformer with out any pwm and give good result above 200v @100W load please check your transformer,b

I am Alexander am looking for a 12v to 220v inverter of 1Kw,2Kw,5Kw power circuit diagram pls help me forword your diagrams to . I built one of 800va but with no pwm section. pls help with my above request and also that of a pwm circuit Thank you Alexander

you are going to need a bypass transistor to boost I to 5amps like 2n3055 beta is lousy but the price is right. an LM317 can only have an input of 37v dif. so 40v would only work once. for 40 v maybe pwm is a good choise. then again why 40v it is kind of hi for normal chips and normal electronics.

Comments on Inverter Circuits suggested by "IanP": Both the circuits are just suggested schemes, and need several protections and modification to avoid malfunctioning when loaded. The power transistors are to be protected from transients and inductive load applications by inserting protection diodes and other components. To avoid core saturati

Hi, Using power transistors will cause plenty of heat. It's better that MOSFETs are used. Take a look at Added after 38 seconds: But, if you're looking for something high performance, you should be using a pwm chip like SG3525/SG3526. [size

Have a look here this does what you need I know that it uses amega 8 but the rest of the hardware will do what you need,I'm sure that aq_mishu would not mind using his hardware, I would say you would need around 18V-20V to charge a 12V battery if you wanted to use the drawing then use a 4

Hi, For Driving the motor you can use source power with a bridge rectifier circuit, But the power supply and the driver circuit should not be on the same board, use a battery, it is a noise free solution, the noise in the power suplly may cause jerks in the motor, instead of using relays you can use driver ic's like IR3220, with o

Hi,i don't think you can achieve pure sine wave using this method,pure sine wave is acheived by using pwm technics, the signal you are feeding to your transistors is an analog signal therefore your transistor will become very hot and even get burnt with the signal you are feeding into the base of the transistors.

MOSFETs share current easier than BJT's since they have a PTC characteristic with Resistance vs T. But you still have a huge problem dissipating the waste heat. Dear Saj, Why do you want to waste 1kW of heat to drive a 500W load? Is this a battery load tester? You know each device is rated for 160W @25C derated 1.1W/'C so if you intend to sa

i didn't know what inrush current was, as i'm new to dc motors and electronics Hi again As you probably know , each motor , at start time , considered as a short circuit . because there isn't any inertia available , yet . hence , the start current will be higher than nominal current . By the way , you didn't tell why you selected

In a sine wave inverter, the inductor, along with capacitor, is used for filtering the output into a pure sine wave. If the sinusoidal pwm frequency is high, the inductance required is small. For modified sine wave inverter, no inductor is required at the output. And certainly not one with a value as large as 250mH.

Often the if the ESR is increased in a circuit, any added Rs would reduce the current, unless relatively small. Car's now use integrated Hall sensors on a tiny shunt loop for directional or bi-directional current sensing from low to 100's of Amps. I used Kelvin shunt

For a realistic circuit for 500W, the entire circuit should be changed for multiple reasons, efficiency being a key factor. The driver stage should be replaced with MOSFETs. There should be output regulation under line/load variation. A pwm controller stage should be used. Features such as low-battery protection and overload protection should be im

Hi everybody ! I just made a buck converter circuit that use Mosfet.With Voltage input is 30VDC and i expect output is 12V DC but when i control pwm to G gate of MOSFET but voltage output alway eqal 30V becase have a Capacitor connected output.How i achived 12VDC. Anybody known can help me.Thank !

I dont know exactly what is the min freq of SG3524. but less than 1Hz also it'll support. for ur req SG3524 (SG1524 or SG2524) is one of the best solution. ref circuit: . - pg no. 5 In other hand u can use 4017 with 555. her