small low-capacitance Schottky diodes

Started by Winfield Hill in sci.electronics.design4 years ago 28 replies

Some here may remember my big RIS-767 project, the "highly-efficient low-voltage boost-converter testbed", with free testbed PCBs offered up...

Some here may remember my big RIS-767 project, the "highly-efficient low-voltage boost-converter testbed", with free testbed PCBs offered up for experimenting. I claimed we could create 98% efficient converters. The RIS-767 testbed allows creating custom converter circuits, as well as using the same platform to test the best commercial boost-converter ICs we could find. Rob Legg h...


MPPT buck converter ICs

Started by Winfield Hill in sci.electronics.design4 years ago 57 replies

Lots of MPPT boost converter ICs, but what about we blokes who need to charge single Li-ion cells, 3.3 to 4.2V, from common 6 to 12V solar...

Lots of MPPT boost converter ICs, but what about we blokes who need to charge single Li-ion cells, 3.3 to 4.2V, from common 6 to 12V solar panels? -- Thanks, - Win


Common Integrated 3V to 9VDC Converter

Started by Fred Leighton in sci.electronics.design10 years ago 6 replies

What would be the most commonly used 3VDC to 9VDC voltage converter that is self-contained, as a module or IC? IOW compact and no...

What would be the most commonly used 3VDC to 9VDC voltage converter that is self-contained, as a module or IC? IOW compact and no external parts. I need about 100mA output, but maybe could get by with 50mA. Something relatively inexpensive and not hard to find or make repeat orders. Fred Leighton


Buck DC-DC converter online simulation

Started by Patrick Chung in sci.electronics.design8 years ago

Online simulation of buck (step-down) DC-DC converter is ready. http://www.cirvirlab.com/simulation/smps_buck_converter_online.php Read...

Online simulation of buck (step-down) DC-DC converter is ready. http://www.cirvirlab.com/simulation/smps_buck_converter_online.php Read theory of operation: http://www.cirvirlab.com/index.php/switching-mode-power-supply/129-buck-or-step-down-converter-b asics.html


Very high gain transformerless boost converter - is it possible

Started by Nomadic Electron in sci.electronics.design3 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?


Boost converter question

Started by Daku in sci.electronics.design10 years ago 6 replies

Frequently, boost converters are specified e.g., "5 - 15" DC. What is the type of load ? If it is capacitive, then it is fine, but...

Frequently, boost converters are specified e.g., "5 - 15" DC. What is the type of load ? If it is capacitive, then it is fine, but not otherwise. Is it fair to say that the boost converter is meant for capacitive loads only ?


Digital Stream DTV converter failed

Started by Anonymous in sci.electronics.design9 years ago 15 replies

I bought it several years ago, but it was just in the closet as a spare. I've only used this DTV converter for a couple months. Today...

I bought it several years ago, but it was just in the closet as a spare. I've only used this DTV converter for a couple months. Today it suddenly just shut off and left snow on the tv screen. If I unplug it, the front LED lights for a second and shuts off. I'm suspecting a capacitor.... Anyone know of a common problem with these converters? Thanks


Flyback converter

Started by Arun J in sci.electronics.design7 years ago

Any design example or guide for multiple output primary side regulated (PSR) flyback converter ?? How good is the regulation when multiple...

Any design example or guide for multiple output primary side regulated (PSR) flyback converter ?? How good is the regulation when multiple outputs are used in PSR flybacks ?


TRC Electronics for power converters.

Started by Yzordderrex in sci.electronics.design2 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


Simulation software for DC/DC converter

Started by nescafe in sci.electronics.design9 years ago 120 replies

Im using LTSpice for now and i must say that this is good software. But... I can not find the parts that i need and those parts aren't in yahoo...

Im using LTSpice for now and i must say that this is good software. But... I can not find the parts that i need and those parts aren't in yahoo groups database. I asked for them but it looks like that i have to make some workaround on those parts or write the new one. Because our DC/DC converter is quite big in schematics I really need some simulator where i can just add parts or change...


FudFly converter

Started by Anonymous in sci.electronics.design1 year 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


Boost converter wisdom

Started by Phil Hobbs in sci.electronics.design3 years ago 37 replies

Hi, all, I'm doing a miniaturized version of my low noise diode laser controller for a big biomed customer. It's supposed to replace an...

Hi, all, I'm doing a miniaturized version of my low noise diode laser controller for a big biomed customer. It's supposed to replace an existing unit for retrofitting, as well as being designed in to their new products. The wrinkle is that it has to run off a single +5V supply instead of our usual +24V. Sooooo, it needs a boost converter. To reduce the dissipation in the TEC drive...


OPAMP ASTABLE

Started by John Larkin in sci.electronics.design8 years ago 91 replies

I was thinking about building a small, low power dc/dc converter, +5 to maybe -25 volts, to bias a photodiode. I only need maybe 0.5 mA, but...

I was thinking about building a small, low power dc/dc converter, +5 to maybe -25 volts, to bias a photodiode. I only need maybe 0.5 mA, but I want the converter to be very quiet, which means no sharp switching edges or shoot-throughs. After futzing with a few ideas, I figured that a pair of r-r opamps, with reasonable slew rates, could do it. So, the opamp astable multivibrator. The comp...


Boost Converter

Started by OldGuy in sci.electronics.design6 years ago 14 replies

Circuit design schematic or commercial product both welcome. Specific specs not needed beyond these. Boost converter. input:0.4VDC to 1.0VDC;...

Circuit design schematic or commercial product both welcome. Specific specs not needed beyond these. Boost converter. input:0.4VDC to 1.0VDC; Output: 3VDC +/- something Output current 20ma or more Any frequency No regulation requirements Don't get hung up on any of the following since they are a wish list but are in order of importance: Maximum efficiency i.e. if there are multipl...


Confusion

Started by Anonymous in sci.electronics.design8 years ago 9 replies

I have to design SCADA system for dam.I have water level sensor which has o= utput between 4 and 20 mA in analog form and it is transferred to...

I have to design SCADA system for dam.I have water level sensor which has o= utput between 4 and 20 mA in analog form and it is transferred to control r= oom about 2 to 3 km apart from dam using OFC. Is it necessary to use amplif= ication and waveform shaping circuit after current to voltage converter hav= ing input 4 to 20 mA and output 0-5v if output from converter to be connec= ted to ADC...


Autocad dwg to gerber converter?

Started by Oppie in sci.electronics.design10 years ago 9 replies

I've got a bunch of old drawings done in Autocad (stored as .dwg format) that we need to convert to Gerber format. Anybody have recommendations...

I've got a bunch of old drawings done in Autocad (stored as .dwg format) that we need to convert to Gerber format. Anybody have recommendations for an inexpensive converter program or service? TIA - Oppie


5Mbaud serial to USB converter?

Started by Syd Rumpo in sci.electronics.design8 years ago 6 replies

Hi Anyone know of a converter which will read 5Mbaud async serial into a PC via USB? Some FTDI parts will do 12 or 3Mbaud, but it's not...

Hi Anyone know of a converter which will read 5Mbaud async serial into a PC via USB? Some FTDI parts will do 12 or 3Mbaud, but it's not obvious to me if they can be set to 5Mbaud. The 5Mbaud is a fixed requirement. Cheers -- Syd


Question about dc/dc converter with mppt

Started by eryer in sci.electronics.design10 years ago 1 reply

Hi, i want to realize a dc/dc converter for battery charging. I want to use a photovoltaic panel as input and a 12V lead-acid battery...

Hi, i want to realize a dc/dc converter for battery charging. I want to use a photovoltaic panel as input and a 12V lead-acid battery as output. Input shoud be between 8V-30V/80Wmax; all system should be based on mppt algorithm. I'm looking for some devboards for start-up: the only one that can be useful for my needs is MPT612 evaluation board. This is an interesting solution, but i'm lookin...


exponential converter temperature stabilization

Started by bitrex in sci.electronics.design5 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


why snubber capacitors on output diodes?

Started by Yzordderrex in sci.electronics.design7 years ago 4 replies

I did a full bridge phase shift ZVS converter many years ago. I remember u= sing some fairly significant RC snubbers on the 2 output...

I did a full bridge phase shift ZVS converter many years ago. I remember u= sing some fairly significant RC snubbers on the 2 output rectifiers. I can't seem to recall the exact explanation for why they are needed. I'm = guessing the leakage reactance in the transformer has something to do with = it. I draw the converter with a pair of inductors on the transformer outpu= t to represent t...