VHF swiching AC/DC converter

Started by Allan Herriman in sci.electronics.design6 years ago 9 replies

I just noticed this product: http://finsix.com/dart/ which claims to be a 65W laptop power brick (including PFC) that switches at VHF (i.e....

I just noticed this product: http://finsix.com/dart/ which claims to be a 65W laptop power brick (including PFC) that switches at VHF (i.e. over 30MHz). Whilst switching in this frequency range has been done for years (e.g. on- die by Intel), this is the first time I've noticed it in a standalone AC/ DC converter. They don't seem to provide efficiency figures, but from the (small) ...


Embedded USB-to-serial converter

Started by Peabody in sci.electronics.design5 years ago 22 replies

I could use some help thinking through what options I may have, if any, for embedding a CP2102 USB-to-serial converter into a MSP430...

I could use some help thinking through what options I may have, if any, for embedding a CP2102 USB-to-serial converter into a MSP430 microprocessor project, so that updating the flash could be done with just a USB cable. The processor would be a MSP430G2231. This function is built into Arduino boards, which have more powerful processors with dedicated pins for all the USB and serial stu...


Voltage converter

Started by gm in sci.electronics.design7 years ago 15 replies

Hi. Is there some ready made voltage converter that has this specs: Input voltage : 24 V Output voltage 1 : 12V Output voltage 2 :...

Hi. Is there some ready made voltage converter that has this specs: Input voltage : 24 V Output voltage 1 : 12V Output voltage 2 : 9V Output voltage 3 : 5V To be more precise, i need three separated power outputs, not just one you can switch. Regards !


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

Started by chetan in sci.electronics.design3 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.design2 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 ...


Integrate DC/DC converters in a friendly package

Started by pozz in sci.electronics.design6 years ago 10 replies

I'd like to use an integrated DC/DC converter on a PCB, but I can't use BGA/LGA or similar package. I have only a very small size on the PCB to...

I'd like to use an integrated DC/DC converter on a PCB, but I can't use BGA/LGA or similar package. I have only a very small size on the PCB to design a full DC/DC converter. Moreover, the price is similar to an all-in-one integrated module. I see uModule from Linear and solutions from Texas, but they all have complex packages (the pads are located under the body and not the sides). ...


Another Ceramic Cap Anecdote

Started by Tim Williams in sci.electronics.design2 years ago 2 replies

Anecdote, since the plural of "anecdote" is not "data". It is suggestive though... 0.47uF 16V X7R 0603, Samsung CL10B474KO8NNNC. Withstands...

Anecdote, since the plural of "anecdote" is not "data". It is suggestive though... 0.47uF 16V X7R 0603, Samsung CL10B474KO8NNNC. Withstands over 120V without breakdown. Tested in a LLC resonant converter. Variable range quite large, and variability doesn't go away when hot. By "hot", we're talking on the order of 20 VAR. Startup of the converter is interesting. It drifts seve...


eBay special boost converter recommendation

Started by bitrex in sci.electronics.design6 years ago 11 replies

Can anyone recommend a China Special high voltage boost converter module? I'm looking for perhaps 12 volts in, ~300 volts out at around 100...

Can anyone recommend a China Special high voltage boost converter module? I'm looking for perhaps 12 volts in, ~300 volts out at around 100 mA. So I'm guessing it's going to be flyback. Isolation not important. -150/ +150 would actually be ideal. If they're cheap I guess I can just get two. -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


DC/DC converter - 8KW

Started by test in sci.electronics.design10 years ago 29 replies

Hi. I need some simple low cost schematics how to make 8KW converter that can convert from 72 to 460V . The basic idea is to wind some strong...

Hi. I need some simple low cost schematics how to make 8KW converter that can convert from 72 to 460V . The basic idea is to wind some strong transformer and to rise the frequency to 200 - 300 HZ + IGBT. There is no need for riple and stable voltage or for PWM control because the inverter is connected to DC link of micromaster and mm is connected to AC 8kw motor. The motor should not p...


buck converter for negative voltages

Started by Winfield Hill in sci.electronics.design5 years ago 13 replies

Suggestions for buck converter ICs for negative voltages? Controller ICs (external MOSFETs) would be nice. -- Thanks, - Win

Suggestions for buck converter ICs for negative voltages? Controller ICs (external MOSFETs) would be nice. -- Thanks, - Win


AC/DC Vicor versus TDK-Lambda

Started by Fibo in sci.electronics.design8 years ago 5 replies

Hello, I need an AC/DC converter that takes in 120Vac, and outputs 24V at 6A nominal load. I have been looking at a VICOR VIPAC for this...

Hello, I need an AC/DC converter that takes in 120Vac, and outputs 24V at 6A nominal load. I have been looking at a VICOR VIPAC for this application, but I noticed that TDK-Lambda has an AC/DC converter with similar specs I was wondering if anyone had experience with these two brands of AC/DC converters, or had any opinions in one over the other? VICOR VIPAC http://www.vicorpower.com/ac...


800+ Watt DC-DC converter ferrite transformer design

Started by P E Schoen in sci.electronics.design8 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.design10 years ago 2 replies

Updated the diagram for the 'on' and 'off' touch button MOSFET added. http://panteltje.com/pub/sc2_pwr_diagram_2_img_3235.jpg This MOSFET is...

Updated the diagram for the 'on' and 'off' touch button MOSFET added. http://panteltje.com/pub/sc2_pwr_diagram_2_img_3235.jpg This MOSFET is in a funny place, between the 2 batteries, this is to get enough drive once it is on. The BLACK button bridges the MOSFET, this starts the boost converter, then the PIC comparator senses if the battery is higher than 2.0V, if so it gives +5V to the M...


Looking for a simple HDMI -> VGA converter design

Started by Anonymous in sci.electronics.design9 years ago 1 reply

Could some electronics guru please help ? I am looking for a simple HDMI -> VGA converter design. I have noticed one...

Could some electronics guru please help ? I am looking for a simple HDMI -> VGA converter design. I have noticed one at https://sites.google.com/site/scidiy/pc-diy/hdmi-to-vga but I feel that there are loose ends that I am not sure about.Any hints/ suggestions would be of immense help. Thanks in advance.


A PIC based boost converter

Started by Jan Panteltje in sci.electronics.design10 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...


Dual-Slope Converter Re-invented

Started by Jim Thompson in sci.electronics.design8 years ago 43 replies

Dual-Slope Converter Re-invented... http://tinyurl.com/mvztnvu ...Jim Thompson -- | James...

Dual-Slope Converter Re-invented... http://tinyurl.com/mvztnvu ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | ...


Keypad to Wiegand Converter

Started by David Lesher in sci.electronics.design2 years ago 4 replies

I'm seeking an existing matrix keypad to Wiengand converter board. (Building one in q10's is less attractive.) I found the MaCaPS one, anyone...

I'm seeking an existing matrix keypad to Wiengand converter board. (Building one in q10's is less attractive.) I found the MaCaPS one, anyone know of others? -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close.......................... Unless the host (that isn't close).........................pob 1433 is busy, hung or dead...


Power supply EMP protection

Started by Piotr Wyderski in sci.electronics.design3 years ago 38 replies

I have a synchronous isolated forward converter which produces 8V@3A. The converter will be connected to about a hundred meters of wire. What...

I have a synchronous isolated forward converter which produces 8V@3A. The converter will be connected to about a hundred meters of wire. What would be a reasonable EMP protection in this case? The EMP may be caused by a nearby lightning (no direct hit possible, "just" the induced transients). To protect the signal lines I use a 75V GDT + a 50mA TBU + a TVS + a series resistor, just in case. B...


Surge current limiting on large capacitors and power factor correction (PFC)

Started by P E Schoen in sci.electronics.design9 years ago 2 replies

I've posted previously about failures in my push-pull high power DC-DC=20 converter, which have most likely been caused by start-up surge...

I've posted previously about failures in my push-pull high power DC-DC=20 converter, which have most likely been caused by start-up surge currents = when first connected to the DC source (batteries), and when the = converter=20 starts charging the output capacitors through a bridge rectifier with a=20 square wave. I think I have found several options such as a resistive=20 precharge resist...


Some MOSFET Questions

Started by Anand P. Paralkar in sci.electronics.design7 years ago 2 replies

Hi, I am developing two circuits - a H-bridge inverter and a boost converter, both of which use a MOSFET(s) with a PWM drive and resistive...

Hi, I am developing two circuits - a H-bridge inverter and a boost converter, both of which use a MOSFET(s) with a PWM drive and resistive load. I observe: a. The rise time measured across the drain and source *reduces* as the output load (as in more amps taken at a given output voltage) on these circuits *increases*. b. On the boost converter, for very light loads, the dra...