Flyback converter

Started by Patrick Chung in sci.electronics.design4 years ago

Even though some authors presents flyback converter as transformer isolated boost converter, it is more closer to reality that flyback dc-dc...

Even though some authors presents flyback converter as transformer isolated boost converter, it is more closer to reality that flyback dc-dc converter can be explained as transformer isolated buck-boost converter. Read more: http://www.cirvirlab.com/index.php/switching-mode-power-supply/132-flyback-dc-dc-converter-basic s.html Also, simulate flyback converter online on http://www.cirvirl


Rohm da converter

Started by Hul Tytus in sci.electronics.design6 years ago

comp.arch.embedded erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points...

comp.arch.embedded erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points and gain for several op amps. The settings for each dac are transmitted by a microcontroller. Rohm's converter works very well... most of the time. Occassionaly, though, the output will be 0 volts instead of what is expected. A conceivable cause cou...


Boost converter

Started by powertec in sci.electronics.design3 years ago

This page presents boost converter design equations, component selection and online simulation for verification: SIMULATE BOOST CONVERTER...

This page presents boost converter design equations, component selection and online simulation for verification: SIMULATE BOOST CONVERTER ONLINE: http://switching-power.blogspot.com/p/boost-converter-design.html


Forward converter is actually transformer isolated buck (step down) converter.

Started by Patrick Chung in sci.electronics.design3 years ago 1 reply

Forward converter is actually transformer isolated buck (step down) converter. Read...

Forward converter is actually transformer isolated buck (step down) converter. Read more: http://www.cirvirlab.com/index.php/switching-mode-power-supply/143-forward-dc-dc-converter-basic s.html Also, simulate forward converter online on http://www.cirvirlab.com/simulation/smps_forward_dc_dc_converter_online.php


erratic behavior with a Rohm DA converter

Started by Hul Tytus in sci.electronics.design6 years ago

sci.electronics.design erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points...

sci.electronics.design erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points and gain for several op amps. The settings for each dac are transmitted by a microcontroller. Rohm's converter works very well... most of the time. Occassionaly, though, the output will be 0 volts instead of what is expected. A conceivable cause...


erratic behavior with a Rohm DA converter

Started by Hul Tytus in sci.electronics.design6 years ago

sci.electronics.design erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points...

sci.electronics.design erratic behavior with a Rohm DA converter A Rohm BU2507, a six channel da converter, is used for setting bias points and gain for several op amps. The settings for each dac are transmitted by a microcontroller. Rohm's converter works very well... most of the time. Occassionaly, though, the output will be 0 volts instead of what is expected. A conceivable cause...


Buck converter design

Started by powertec in sci.electronics.design4 years ago

A first in a series of circuits in a circuit collection dedicated to switching converter design and simulation: BUCK CONVERTER DESIGN: design...

A first in a series of circuits in a circuit collection dedicated to switching converter design and simulation: BUCK CONVERTER DESIGN: design equations and online simulation circuit Check the link below to find buck converter formulas, component selection and simulation circuit. http://switching-power.blogspot.com/p/buck-converter.html


Bubbler Converter

Started by John Larkin in sci.electronics.design4 years ago

Here's another cap charger circuit. After blowing up a number of LTC chips, burning fingers, and sampling about a dozen tiny transformers for...

Here's another cap charger circuit. After blowing up a number of LTC chips, burning fingers, and sampling about a dozen tiny transformers for flyback converters, we revisited the simple home-made peak-current-controlled buck converter. It's a boost-doubler, a Bubbler Converter. The main problem with a simple boost converter is the huge turn-on inrush into Cload, which will be 4000 uF in...


PFC to isolated 35V converter for Joerg

Started by Harry D in sci.electronics.design3 years ago

Joerg, The best topology for your 75W PFC, 35 Vout AC to DC converter is a standard PFC Boost converter followed by an isolated, 200V to 35V...

Joerg, The best topology for your 75W PFC, 35 Vout AC to DC converter is a standard PFC Boost converter followed by an isolated, 200V to 35V LLC converter. Each stage should yield 0.94% efficiency with an overall 88% total efficiency. The PFC boost converter is a simple 8 pin device and the LLC is a 12 pin sip with the bridge included. You probably need holdup time and this gives it to ...


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

Started by Myauk in sci.electronics.design6 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...


High voltage buck and forward converter .... - or one stage direct

Started by Klaus Kragelund in sci.electronics.design9 years ago 21 replies

Hi I need to design a wide input range converter (16VDC to 600VDC) with two 5V outputs with a total power of 25W. The supply needs to be...

Hi I need to design a wide input range converter (16VDC to 600VDC) with two 5V outputs with a total power of 25W. The supply needs to be double isolated and my first thought was to use a HV buck converter to step the voltage to 16V and then a forward converter (half-bridge) to step down to 5V and provide safety isolation. Two questions: 1. Do you know an integrated IC than can buck...


unregulated dc-dc converter

Started by ***Marco*** in sci.electronics.design2 years ago 4 replies

Hi all, I'm trying to figuring out how a circuit which employs an unregulated Dc-DC converter works. I've never used one before, so I'm...

Hi all, I'm trying to figuring out how a circuit which employs an unregulated Dc-DC converter works. I've never used one before, so I'm asking for some clarifications. The dc-dc converter is the PICO 5A250S (http://www.picoelectronics.com/dcdclow/pe62_63.htm). As the datasheet states, I'm expecting that for input voltages in the range 4-6.5 V the output is 250 V. But should I expect...


Boost DC-DC converter online simulation

Started by Patrick Chung in sci.electronics.design4 years ago

Online simulation of Boost converter DC-DC converter is ready. Boost DC-DC converter has output voltage always higher then the input. This...

Online simulation of Boost converter DC-DC converter is ready. Boost DC-DC converter has output voltage always higher then the input. This makes it particularly useful in battery systems as well as power factor corrector circuits. Now it can be online simulated: http://www.cirvirlab.com/simulation/smps_boost_or_step_up_converter_online.php Read theory of operation: http://www.cirvirl...


SEPIC Converter Design

Started by powertec in sci.electronics.design3 years ago 2 replies

SEPIC (non-inverting buck-boost) converter design: design equations, component selection and interactive online simulation...

SEPIC (non-inverting buck-boost) converter design: design equations, component selection and interactive online simulation circuit. http://switching-power.blogspot.com/p/sepic-converter-design.html


Achieving 98% efficiency in a boost converter

Started by Winfield Hill in sci.electronics.design3 months ago 76 replies

Anybody care to speculate about the most important aspects to consider when trying to achieve 98% efficiency in a low-power (20mW) boost...

Anybody care to speculate about the most important aspects to consider when trying to achieve 98% efficiency in a low-power (20mW) boost converter? Most available step-up converter circuits seem to perform in the 85 to 90% region. I'm finishing a PCB "test bed" layout, which allows jumper-selection of different inductors, synchronous switches, and adjustable controller parameters. I'm hopi...


9V Battery or 2 x AAA with 9V Converter

Started by Anonymous in sci.electronics.design3 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...


Help with 12/24V input, 14.1V output DC/DC Converter

Started by Luis Filipe Rossi in sci.electronics.design7 years ago 10 replies

Hi, i need to designe a DC/DC Converter that would work either with 12V and 24V, and have an Output of 14.1V and 0.5A. I dont need to cover all...

Hi, i need to designe a DC/DC Converter that would work either with 12V and 24V, and have an Output of 14.1V and 0.5A. I dont need to cover all the range. Just both extremes. I was tring to designe a SEPIC converter but i cant find any IC with reasonable avaibility here on my country (Brazil). I was trying to designe a step-up/Down using MC34063 and fowllowing this AN: http://www.onsemi.com/p...


Buck-boost DC-DC converter online simulation

Started by Patrick Chung in sci.electronics.design4 years ago

Online simulation of buck-boost converter DC-DC converter is ready. Buck-boost DC-DC converter has special feature that output voltage is with...

Online simulation of buck-boost converter DC-DC converter is ready. Buck-boost DC-DC converter has special feature that output voltage is with negative polarity, and absolute value of the output voltage can be either higher or lower then the input voltage, depending on duty cycle. http://www.cirvirlab.com/simulation/smps_buck-boost_converter_online.php Read theory of operation: http:...


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

Started by Jan Panteltje in sci.electronics.design3 years ago

A 2.4GHz to 1.5 GHz down converter A whole new range of interesting frequencies opens up with this litte converter, here now in box with...

A 2.4GHz to 1.5 GHz down converter A whole new range of interesting frequencies opens up with this litte converter, here now in box with antenna: http://panteltje.com/pub/2.4_GHz_to_1.5_GHz_mixer_in_box_IMG_4661.JPG Modified my rtl_sdr based xpsa spectrum analyzer software to allow for a local oscillator setting: I found a peculiar very strong intermittent signal around 2432271360 H...


MOSFET breakdown prevention in a boost converter

Started by Anonymous in sci.electronics.design8 years ago 6 replies

Hello: I am designing a boost converter, and I am uncertain whether I need to take specific measures (and which) to protect the main switch...

Hello: I am designing a boost converter, and I am uncertain whether I need to take specific measures (and which) to protect the main switch MOSFET from the drain-source voltage breakdown. The fet is incorporated in the switcher IC, and has the maximum voltage rating of 60V. I want the converter's output voltage about 55V. Now, if one takes into account the parasitic inductance of the PCB t...