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tell me a few methods to check conduction and switching losses...as mentioned earlier switching frequency is 5kHz and Ids is 2-3.5A and is fused at 4A...i do not expect that much conduction or switching losses in these conditions.
i have very clean Vgs wave form. no spikes no sinosoidal components, Vgs is little more than 10V.
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i have very clean Vgs wave form. no spikes no sinosoidal components, Vgs is little more than 10V.
I am not using a diodo anti parallel with gate resistor, which according to some people helps turn of the FET quickly, can this be the problem.
but the question remains, why dont the TWO boards with same design work fine..=(
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is it possible that just by chance all the...
anyone here with a solution/suggestion..?? the voltage waveform on gate is okay, enough to drive the FETs in saturation region..still FETs are heating up..!
FvM,
the 2.2uF is not ceramic type..but i will add a ceramic cap and see what happens. some friend suggested to add a ceramic cap of low value between source and ground to sink any spikes from power supply...should i try it..??
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ADD to it: the MOSFETs on Faulty boards heat...
@ice-tea
thanks for your reply..what do you recommend..?? i,ve a working circuit of exactly same design and components value..!! how do i decrease charging time, by changing bootstrap cap..??
HI
i am using IRF540 MOSFETS with Rds(on)=44m ohm. using IR2110 to drive the MOSFETs at switching frequency 5kHz. the H bridge is used to drive a permanent magnet DC motor with current rating 3A MAX while the MOSFET can handle upto 33A (according to datasheet). there is a dead band delay of...
yes offcourse you can build a simple robot with 8051, like u can use external PWM generators, external adc's, you can also use more than one 8051 and communicate them through UART, at expense of speed and problems while troubleshooting. if you have an option, go for PIC.
Relays has their rating like e.g. 220V/10A. untill you keep your load current limited to the rated current (10A) there wont be any issue of voltage drop due to temperature. while the coil voltage needs to be maintained otherwise the relay will switch back to normally closed contact.
usman
8051 and AVR are ALMOST same..AVR is with faster speed, more peripherals like builtin adc, comparator and PWM channels. its easy to program and even has builtin oscilators upto 8mhz. AVR has in system programming capability. it is good for hobby robotics. for more professional robotics projects...
As far as i understand, the 28V are used to power the actuator...and you want to control via PC PIN which gives 5V. you can use a simple optocoupler to switch 28V using your computer PIN. If current requirement of the actuator is high you can cascade a darlington to drive it or use single pole...
as far is converting analogue to digital is concerned, there are ADC(Analogue to Digital convertor) IC,s which are interfaced with microprocessor or controller to get digital data. These days alot of Microcontrollers come with buitin ADC,s.
here is the working principle of an ADC.
**broken...
Thanks for your reply,
since this is just a part of my final year project, capacitive loss was an objection raised by a faculty member. and i couldn't find any calculation or modelling anywhere on the internet. can you give me a link or literature which would help me model the exact system. or...
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