DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched ...

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1answer
22 views

boost converter load problem

I am designing a boost converter for wind turbin, with load 12Vdc, 2A. Before I install my boost converter on my windturbin, I putt a test to make sure it work properly. So I use this circuit to ...
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0answers
44 views

code mickro C for CLosed loop control for switching boost converter not working

i try to write a code in mikro C for closed loop control for boost converter for get the stabe output voltage inputvoltage : 12V output voltage =26V bellow the code ...
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1answer
47 views

Solar boost converter unstability

My design of a boost converter is the following Input: 40V/1.5A Output: 100v/0.62A Inductance used: 3.15mH Capacitance used: 220uF (rated 200V) diode switch used: IRF830 (rated Vds=500v) ...
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1answer
26 views

An current source with UC3842

I find an adjustable current source circuit with UC3842, but without description. The main difference with a voltage regulator is the error amplifier's negative input comes from the current sensing ...
0
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1answer
32 views

Inductor Core Loss: Volt-uS vs. Irms vs. Switcher Frequency

For DC to DC application, I see these charts often for inductors, but I don't understand what they actually mean. What does this chart mean, and how does it relate Volt-uS, Irms, & Freq? Edit: ...
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1answer
26 views

Supply microcontroller and solenoid with the same battery at different voltage levels

I'm working with a microcontroller which its supply voltage range is 1.8V to 3.6V I want to connect a solenoid to this mcu (this solenoid will be activated occasionally). Current–voltage ...
0
votes
1answer
121 views

RPI with power supply alternating between Li-ion battery pack and DC 5V

I have a Raspberry Pi model B+ and I've been trying to design a solution so that I can switch power supply without having to shutdown. The idea is this: I have 2 li-ion 18650 batteries with ...
0
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0answers
57 views

MC34063 issue. Switches off every cycle

I am using MC34063 in step down configuration but the converter switches off every cycle. Following are the calculations and specifications: Vin - 9 to 12V Vout - 5V Imax - 0.3A Rsc - 0.36 ohms L - ...
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2answers
62 views

Can I safely substitute a DC converter for the Macbook's AC adapter?

I want to go from this: to this: The converter would be this: http://smile.amazon.com/dp/B00HVCWGNE or something like it. Does this sound safe? The step up converter would be set to a specific ...
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0answers
29 views

Drive 5630 led strip with one 18650 battery

I would a DC-DC step up converter in order to use one 18650 battery for power a led strip? Is it possible? If yes, what could be the power loss in the conversion process?
2
votes
1answer
68 views

Standard transformer for higher-voltage dual output flyback converter

Is it possible to modify this flyback converter to get the output voltage somewhere up in the range of +/- 26-60v (preferably 30v or more) without having to make my own transformer? I would also like ...
1
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1answer
74 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article ...
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2answers
74 views

How to design a boost converter? And how to specify the inductor and capacitor values?

I want to design a boost converter with input of 48V and need to get to a voltage of 100V. How to select the inductor and capacitor values in it?
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3answers
48 views

Which low pass frequency filter to configure to measure/calculate DC-DC converter efficiency?

I am measuring the DC-DC converter active power (P in watts) efficiency of a TI (Webench) LM3150 PCB that converts 12 to 5VDC. In the answer of question Measuring precisely the efficiency of a power ...
5
votes
2answers
182 views

What is dead time in DC-DC converters?

In a power management integrated circuit (PMIC) documentation I came across a programmable dead-time parameter for a DC-DC converter. What does ...
7
votes
3answers
686 views

How does DCDC save power over an LDO?

I am using a camera module of our custom application. The camera module started consuming more current when compared to a previous board which has all the same settings, chipsets and modules. In our ...
0
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0answers
12 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
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0answers
29 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
votes
0answers
36 views

LTSpice parameter sweep of multiple values

I have designed a boost converter for my power electronics class in LTSpice. The thing works just fine, now all I have to do it fiddle with the component values and frequency to describe the trends I ...
0
votes
1answer
68 views

Power regulation and isolation for low current device

I'm looking for a solution to regulate power and provide isolation for a 3.3VDC system. I am using a 5VDC 500mA power supply that needs to be regulated to 3.3VDC with isolation to protect analog ...
0
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0answers
77 views

Single or dual ground plane for SMPS DC-DC converter?

I'm working on DC-DC converter prototype using dual layer PCB. Layout it finished using bottom layer as ground plane. Question is does make any sense to put on top layer also ground. How that can ...
2
votes
1answer
70 views

Reduce voltage by a constant 100mV

For a project I have a digital thermometer which outputs a DC voltage of 100mV at 20 degrees C and 250mV at 50 degrees C, which is the range we're interested in. We're putting that into an Arduino via ...
0
votes
1answer
31 views

5v or 6v operating dc-dc for mobile battery?

For mobile battery, what voltage is suitable btwn 5v or 6v? What factor does influence on choosing different voltage for mobile battery?
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1answer
62 views

Excessive Boost Converter Output

I'm implementing a boost switching regulator based on a Texas LM5002 chip (datasheet), to get about 65V from a 12V supply. The design I've arrived at is shown below, inspired both from the data on the ...
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2answers
32 views

Stepping-down DC voltage (at low current) in the presence of an audio circuit

I'm trying to add a bluetooth audio receiver to an old 12V battery-powered boombox. The receiver board takes 5V and shouldn't draw much current, but I'm trying to understand which type of DC-DC ...
0
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0answers
22 views

Find duty cycle ratios and ripples frequency in DC-DC converter

I am asked to find the duty cycle ratios (D1 & D2) and ripple frequency of the two control principles of the following circuit: The bridge is controlled to provide an average output voltage, Vo ...
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0answers
128 views

Step Up DC DC [12 to 300] using MAX1771 Chip

I am trying to build my first circuit following the information posted here 12v to 300v Boost Converter - Ideal Inductor for 9kOhm load I tried to answer there before opening this new topic,but I need ...
0
votes
2answers
72 views

How to convert 12v dc to smooth, as if coming from a battery, 6v dc (EMI – RFI free)

I’m an electronics newbie. I did a very simple project. In order to convert 12v dc to 6v dc I used one of those step down converters. Unfortunately what I’m trying to power is an AM radio. It power on ...
2
votes
1answer
56 views

AP5002 step-down switching regulator loop stability

Problem, parameters I have an 5V output power supply, with 2S LiPo input (6-8.4V), implemented with AP5002 (PWM control 2A step-down switching regulator, docsheet), and for the life of me, I can't ...
0
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2answers
63 views

Create a Time-Variable Dc Power Source

For some reason, I need a Time-Variable DC power source that changes it's value according to time. I need this changing of value to be controllable. I'll put it this way : Say I have a 12 volt DC ...
0
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1answer
81 views

using an “isolated DC/DC converter”, what is the schematic?

I'm trying to use a "isolated DC/DC converter" (5v --> 12v converter) (MEE3S0512SC, ...
0
votes
1answer
62 views

Output Capacitor value calculation based on Transient response in Buck converter

In Buck design, The output capacitor's initial value is calculated based on how much current transient buck will support. Few equations took from appnotes. from these equations, for A given ...
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2answers
88 views

Trying to build a circuit to boost 5 V DC to 250 V DC with fairly low current output

I am fairly inexperienced with electronics, but I am trying to build a 250 V DC supply from a 5V source. From research, I have run across charge pumps and boost converters. I tried using charge pumps, ...
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2answers
42 views

Which Power Management implementation to use and the differences therein

Upon using an 'RF to DC converter', DC power management is needed. There is a dilemma in the approach as there are a number available. From the storage capacitor, there is the 'Switched-mode power ...
15
votes
1answer
606 views

Isolated DC/DC Converter - Purpose of Capactor connecting two GNDs?

I've been looking at board mount isolated DC/DC converters to use in an application. I found this rather reasonably priced for my needs. Here is what I'm confused about, what is C103 doing here? Isn't ...
4
votes
3answers
304 views

DC-DC Converter Unusally Low Load Capability

I've been working on trying to get this SMPS to work for a while. I'm using an LTC1872, a step up DC controller with current limiting. The circuit used is the typical application provided in the ...
1
vote
1answer
178 views

How to bypass DC-DC converter with N-channel high side MOSFET

I have a DC-DC SMPS converter which is used as a pre-regulator in the power supply with linear post-regulator. A specific requirement is to provide mode of operation when pre-regulator is bypassed. ...
0
votes
1answer
67 views

DC- DC converters

Is it possible to get a DC DC converter which the output voltage varies proportionally to the input voltage? ie 14V in 28V out, 13.4V in 26.8V out. To add some context I wish to charge a 24V battery ...
1
vote
3answers
152 views

Solution for “No drop” LDO

I have a very noisy 5V supply, the noise is in very low FQ around 1kHz. From all the components In my project there is only one I have to provide with 10Hz - 2kHz clean 5V. But because I need 5V ...
1
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2answers
154 views

How to drive an IGBT with an optocoupler?

What's the proper schematic for driving the IGBT (IRG4BC20UD) from a microcontroller (MSP430-g2553) pin through the optocoupler (FOD3184)? I am going to design a full bridge inverter to drive 9W CFLs ...
0
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2answers
82 views

What can cause the output voltage of a buck converter to drop (apart from high current)?

I am using the LTC3388-1 buck converter to provide a microcontroller with a regulated 1.8V voltage. I use pretty much the reference circuit as seen in the image. When I disconnect the ...
2
votes
3answers
133 views

What does the line “edge resonance between an inductor and a capacitor” exactly mean?

I am working on a project on DC DC converters in which the concept of soft switching i.e, Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) are used. One method to attain this is using an ...
1
vote
1answer
60 views

Pololu step-up converter drops voltage

I have a Pololu 3.3V step-up converter - U1V11F3. I tested it by connecting a regular 1.5V alkaline battery for input and a resistor at output. With no load or small load (10K) it keeps the output ...
3
votes
2answers
182 views

Why does the current rise and fall linearly in a DC-DC converter?

I don't understand why the current in a DC-DC converter rises and falls in a triangular waveform pattern. I think it has something to do with the energy in the magnetic field, but I don't know any ...
1
vote
4answers
93 views

DC/DC overvoltage problem

I am using a 12V to +-5V NMH1205DC converter. When I measure the output voltage without a load, it measures about +-8V. This converter will power a low current circuit that contains several OpAmps. ...
1
vote
1answer
52 views

How is the switch current related to output current in a DC-DC converter?

I have designed and implemented a DC-DC converter with the following specs: Input Voltage: 5V Input Current (max): 3A Output Voltage: 12V Output Current (max): 1A DC-DC Controller: MC34063 Inductor: ...
0
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1answer
199 views

Op amp based DC-DC voltage doubler

I have a LM471 op-amp and a single DC 5V source. Is it possible to double the source voltage using this op-amp? Can the op-amp be powered by the very singnal to be ...
0
votes
0answers
47 views

voltage regulator fail

I am using the RT8298 for voltage regulation. The parameters of my system and the schematic are stated below - Vin = 8V-12.6V, Vout = 5V Iout(max) = 5Amps. The ripple current = approx 25% =1.25Amps. ...
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0answers
69 views

inductor selection for DC DC

I am using a buck conv rt8298. My load is abt 5 amps. Input is 12v and output is 5v. I selected an inductor of 8.2uH. The formula tells abt 3.4uH. And sometimes it does not work. Just becos I choose a ...
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0answers
50 views

RT8298 oscillations in output

I am using the RT8298 dc dc from Richtek. I find an anomaly in the behavior of the chip. When the input is a max of 11V the o/p is smooth dc level of 5V. When it is greater than 11V there are severe ...