What is the reason that the duty cycle for Boost Converter should be around 50%?

Started by Myauk in sci.electronics.design11 years ago 11 replies

Dear All, I am currently trying to design a solar inverter. I am looking at the boost converter stage, At fist I was planning to boost from...

Dear All, I am currently trying to design a solar inverter. I am looking at the boost converter stage, At fist I was planning to boost from 48V to 400V using simple boost converter, but after calculation, the theoretical duty cycle for it is more than 80%. People say it is not good for such converters. May I know your opinions on why it is that the duty cycle of Boost Converter should be a...


9V Battery or 2 x AAA with 9V Converter

Started by Anonymous in sci.electronics.design8 years ago 34 replies

In terms of battery life, and assuming the same brand of Alkaline battery, is it more efficient to use a 9V battery or 2 AAA cells...

In terms of battery life, and assuming the same brand of Alkaline battery, is it more efficient to use a 9V battery or 2 AAA cells with something like the TL496 converter pictured here. http://www.electroschematics.com/6788/3v-to-9v-dc-converter/ If not, what is the approximate difference either way? The circuit involved is a test audio oscillator. Would be nice if they made mor...


Half bridge DC-DC converter topology

Started by P E Schoen in sci.electronics.design10 years ago 20 replies

There is a thread in=20 http://www.diyelectriccar.com/forums/showthread.php/evnetics-developing-d= c-dc-converter-72862p5.html=20 which...

There is a thread in=20 http://www.diyelectriccar.com/forums/showthread.php/evnetics-developing-d= c-dc-converter-72862p5.html=20 which suggests a half-bridge DC-DC converter with the following = topology: http://www.diodes.com/zetex/?ztx=3D3.0/application@app~49!top~5!curr~13 Originally I thought it was only useful for low power applications like=20 phone chargers, and I think the capaci...


Very high gain transformerless boost converter - is it possible

Started by Nomadic Electron in sci.electronics.design4 years ago 86 replies

Is it possible to build a 130-150 Watt, 12V input (for example, car cigarette lighter) to 350V output transformerless boost converter. The...

Is it possible to build a 130-150 Watt, 12V input (for example, car cigarette lighter) to 350V output transformerless boost converter. The efficiency should be at least 85%. Assume a resistor load only. If it is not possible, Would there be any other possible tranformerless solutions?


TRC Electronics for power converters.

Started by Yzordderrex in sci.electronics.design3 years ago 1 reply

I bought a small dc-dc converter today for a nice price from TRC Electronics. I think most of their gear comes from China. The stuff from China...

I bought a small dc-dc converter today for a nice price from TRC Electronics. I think most of their gear comes from China. The stuff from China has worked well for me so I am not a basher. They have an interesting product offering so if you need something then take a look at what they have. A few hours after I ordered the converter I received a call from Eric at TRC thanking for


FudFly converter

Started by Anonymous in sci.electronics.design2 years ago 43 replies

I guess this is pretty obvious, but when the fet turns on, it's a forward converter charging C1, and when it turns off it's a flyback charging...

I guess this is pretty obvious, but when the fet turns on, it's a forward converter charging C1, and when it turns off it's a flyback charging C2. https://www.dropbox.com/s/4vsi3a5r3ky0wv0/FudFly_Conv.jpg?raw=1 -- John Larkin Highland Technology, Inc Science teaches us to doubt. Claude Bernard


exponential converter temperature stabilization

Started by bitrex in sci.electronics.design6 years ago 22 replies

Could some electronics guru...heh, no, I'm not that guy. But could some electronics guru explain how this circuit is supposed to stabilize...

Could some electronics guru...heh, no, I'm not that guy. But could some electronics guru explain how this circuit is supposed to stabilize the Vt dependence of a differential pair V-> I exponential converter circuit? http://www.openmusiclabs.com/files/lm13700_expo2.jpg


hoe to draw bidirectional dc dc converter for dc nano grid in ltspice

Started by chetan in sci.electronics.design4 years ago 28 replies

I need to design nonisolated dc-dc bidirectional converter for dc nano gride system. i am not sure how to draw in ltspice or in Matlab. please...

I need to design nonisolated dc-dc bidirectional converter for dc nano gride system. i am not sure how to draw in ltspice or in Matlab. please help me out. --


A quiet forward converter likes only one MOSFET -- why?

Started by Piotr Wyderski in sci.electronics.design3 years ago 18 replies

Hi, I have been trying to build a low-power multiple-output converter that has no regulation at the secondary side. Its purpose is to power...

Hi, I have been trying to build a low-power multiple-output converter that has no regulation at the secondary side. Its purpose is to power many floating MOSFET drivers, so a reasonably too low voltage is not a problem, but to high certainly is. Particularly, the experiments involved powering a mock-up SiC MOSFET driver with +15/-3.3V rails. Therefore, the smoothness of the transition ...


800+ Watt DC-DC converter ferrite transformer design

Started by P E Schoen in sci.electronics.design9 years ago 29 replies

I want to make a DC-DC converter for 48 VDC to about 300 VDC at a = continuous=20 power of about 800W to drive a 1 to 2 HP three phase induction...

I want to make a DC-DC converter for 48 VDC to about 300 VDC at a = continuous=20 power of about 800W to drive a 1 to 2 HP three phase induction motor. I = have=20 some E55 cores and coilformers which should do the job, and also some=20 E47/20/15 which might work OK. The E55 is an Epcos type N27 and the E47 = is=20 probably the same. http://www.mouser.com/ds/2/136/e_47_20_16-75097.pdf h...


A PIC based boost converter

Started by Jan Panteltje in sci.electronics.design11 years ago 43 replies

A PIC based boost converter The old design as discussed here last week had problems starting oscillating with heavy capacitive loads. The...

A PIC based boost converter The old design as discussed here last week had problems starting oscillating with heavy capacitive loads. The efficiency was only about 50 % too. The TI super switcher chip is invisibly small and difficult to obtain without forking out $$$ for shipping and maybe customs. That left the junk(well its valuable) box. I already have 2 PICs 18F14K22 in this design, p...


Ultra-low power switching boost converter - in a DIP

Started by Peabody in sci.electronics.design6 years ago 24 replies

For a hobby project, I've found the perfect part for converting battery power to a very low current (2 ma at most) 28V power supply. And that...

For a hobby project, I've found the perfect part for converting battery power to a very low current (2 ma at most) 28V power supply. And that is the Linear Technologies LT8410-1 "Ultralow Power Boost Converter". The problem is that the only package available is a tiny surface mount chip that's 2 x 2 millimeters, which effectively makes it impossible to deal with using a soldering iron....


CPU fan buck converter, miniature

Started by Winfield Hill in sci.electronics.design3 years ago 30 replies

https://www.dropbox.com/s/wttdn9r8np3o0t6/buck_CPU-fan.JPG?dl=0 I had finished a new PCB version of my compact 250A analog pulser, with a...

https://www.dropbox.com/s/wttdn9r8np3o0t6/buck_CPU-fan.JPG?dl=0 I had finished a new PCB version of my compact 250A analog pulser, with a newly-added CPU fan. The fan was powered with an 78L12, hey, there wasn't room for much else. But it was obvious its 300mA would overheat the TO-92 regulator, plus what a waste of power! I needed to fit a buck converter. This called for a SOT-...


A 2.4GHz to 1.5 GHz down converter layout, and VCO internals.

Started by Jan Panteltje in sci.electronics.design8 years ago

A 2.4GHz to 1.5 GHz down converter layout This is basically a VCO, mixer, and voltage stabilizer: ...

A 2.4GHz to 1.5 GHz down converter layout This is basically a VCO, mixer, and voltage stabilizer: http://panteltje.com/pub/2.4_GHz_to_1.5_GHz_converter_IMG_4645.JPG The screw in the trimpot will allow fine adjustment of the output frequency from outside the box. After using this 964 MHz VCO in several projects, finally a pad (VCO in) broke off. Had to open it... removed the cover: ...


MC34063 Step-down Converter Heating Problem

Started by Anand P. Paralkar in sci.electronics.design11 years ago 21 replies

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown...

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown here: http://www.eleccircuit.com/wp-content/uploads/2008/01/ipod-mp3-player-charger-by-mc34063.jpg My circuit does not have the Zener, output side LED and input side protection diodes (TVS1 and D2 in the circuit). The rest of the circuit is quite similar. The...


Best way to solder prototype pcb with thermal-pad ICs?

Started by Winfield Hill in sci.electronics.design3 years ago 27 replies

I'm struggling with issues prototyping PCBs having ICs with a thermal pad. I assembled a new 100-volt buck converter powering a 12V fan, see...

I'm struggling with issues prototyping PCBs having ICs with a thermal pad. I assembled a new 100-volt buck converter powering a 12V fan, see schematic: https://www.dropbox.com/s/ypvtp2z74nudps7/RIS-796_3_Fan-supply_sch.JPG?dl=0 The circuit uses the elegant NSC LM5163, a 100V 0.5A 1MHz converter in an SO-8 PowerPad package. On the pcb layout, I had extended the thermal pad beyond ...


24V to 500-1000V, 20W floating DC-DC converter

Started by Matt B in sci.electronics.design2 years ago 105 replies

I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. My specs...

I need to make a 24V to 500-1000V, 20W adjustable power supply for a pulser. It needs to be a floating or negative converter. My specs are: Input: 24-28V Output voltage: 500-1000V adjustable via control signal Output current: 10mA @ 500V (5W), 20mA @ 1000V (20W) I've been reading through threads on different HV designs. So far the only one I've come across that is isolated is Figure


Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project

Started by Jan Panteltje in sci.electronics.design8 years ago 8 replies

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module...

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module Converter Adapter for arduino ebay object: 360750555245 Module has 5V and 3.3 V out (from the USB power). The PL2303 works 100% OK with Linux native drivers. Just connect to RS232 in and RS232 out, and power, and no need to write USB code, or get a sp...


DC-DC converter advice (5V to 6.5V)

Started by Anonymous in sci.electronics.design5 years ago 6 replies

Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know...

Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led. Regards, Scot


Guitar MIDI controller/converter - bitrex?

Started by Don Y in sci.electronics.design8 months ago 25 replies

Advice on good ("respectable") candidates for the above? Not keen on a guitar-wannabe "instrument"... (Also, not keen on anything that will...

Advice on good ("respectable") candidates for the above? Not keen on a guitar-wannabe "instrument"... (Also, not keen on anything that will not be able to completely restore axe to original condition when no longer needed/wanted)