Questions tagged [boost]

A non-isolated DC/DC converter topology.

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2 answers
72 views

Low quiescent current boost converter for battery application (Io < 200 μA)

I am designing a PIR sensor alarm. It must be able to run on batteries for about a year. I am using 3.7 V Li-ion batteries to power an ATtiny24 directly. Although my PIR senor needs 5 V as recommended,...
0 votes
0 answers
39 views

Increase boost converter power

I am looking to build this DC-DC boost converter. I know what parts were used to build a 150 W version of this design. I would like to build a 500 W version which basically has the same input and ...
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0 answers
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Circuit design options for 58V lithium battery charger

I have an Echo 58 volt chainsaw and the battery charger has malfunctioned so that it no longer charges the battery pack. I have been charging it by using a 2A current limited lab power supply set to ...
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0 votes
1 answer
66 views

What is the best and simplest way to switch on a boost converter with an Arduino?

I am trying to control a 24V load with a 5V Arduino pin. I once burnt an Arduino but couldn't find why. I am extra cautious now. My new design: On the left side of R4 there is an Arduino pin. On the ...
0 votes
1 answer
58 views

Boost converter design issue

For a circuit I'm designing, I want to use an MC34063AL-D08-T DC/DC converter (or a similar one; I just need a through-hole package) as a boost converter to boost a voltage Vin = 3.3-4.2 V (coming ...
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0 votes
3 answers
72 views

Is it a bad idea to add capacitors in parallel to the output of a boost converter?

I just tried it and my power supply makes this unusual whining sound (not there normally), that doesn't seem right. I am using an MPS mEZD41503A-A for my power supply, it is stepping up an 18650 ...
2 votes
3 answers
74 views

Does the output voltage of a boost converter without load approach infinity?

where R is an open contact If I understand it correctly for a given square waveform the energy stored in L is constant for every charge cycle(part of the cycle when S is closed). When S is opened L ...
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-1 votes
2 answers
64 views

Boost CCM PFC inductor current

Does anyone know how to use Mathcad to draw the boost PFC inductor current waveform? There is no equation to tell me how to do it, so I am confused. https://www.infineon.com/dgdl/...
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1 answer
111 views

Do DC-DC converters have a power factor smaller than 1?

Say I have a boost converter (picture below) that accepts a constant DC input and outputs a constant DC signal. Does this system have a power factor (PF) that is smaller than 1 (because the circuit ...
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3 votes
2 answers
125 views

Voltage regulator output increases significantly when step-up converter runs

I'm using the LTC3108 step-up converter to charge a supercapacitor from a thermoelectric generator. The output voltage drives a 1.8V regulator (S-1318) which is enabled once the voltage reaches 4V (...
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0 votes
2 answers
47 views

Boost converter and solar cells

I have a solar cell with 0.5 V and 3.5 A output. Will a boost converter lower the current and raise the voltage? I would like to lower the current to max. 1 A and raise the voltage to max. 22 V.
1 vote
1 answer
47 views

How to calculate power dissipation for an MT3608L current-mode step-up converter?

I'm using an MT3608L with an input voltage of 12 V to create a voltage of 18 V using the below schematic. As this is a cutout of a larger schematic, the input voltage is applied to the top left wire, ...
0 votes
0 answers
38 views

Buck and boost converter

I want to make an energy control system on a stationary bike. The main input comes from a generator and the secondary input comes from a 6 V battery. The voltage from the generator ranges from 1-10 V, ...
0 votes
1 answer
50 views

Design of a high voltage system for solar car using MPPT with batteries and motor controller

We are planning to make a system that can run a BLDC motor and charge a battery with a PV array using a boost MPPT. Current aiming spec on output side: Nominal voltage 96V. I am nt sure if there are ...
3 votes
1 answer
76 views

Boost converter not working with any inductor

So I have been trying to design and build a boost converter which steps 5 V up to 12 V. More specifically, the output is to drive a fan which runs on 12 V, 70 mA (nominally). As could also be seen in ...
2 votes
4 answers
168 views

Boost Voltage of Signal Generator Output (via Audio/Signal Transformer?)

Goal: Have a frequency variable voltage of at least 200 V (more would be great), between 50 Hz and 8 kHz (sine wave, as pure as possible). The voltage is used as open circuit voltage (only drives a ...
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0 votes
1 answer
40 views

Minimum load current on boost converter

I was hoping to use the LM2731Y boost converter to step up 3.6V to 7V, but I'm unclear if this will work for my load requirements. I will likely have a fairly low current draw (<50mA) and there is ...
1 vote
1 answer
58 views

MC34063 boost circuit drops voltage when adding load resistor in LTspice

I am using LTspice to simulate a MC34063 boost circuit to bring a 3.7 V Lipo battery up to 5 V in order to power a Raspberry Pi Zero. When I simulate the circuit it works just fine (shown in the first ...
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1 vote
3 answers
131 views

Boost Converters v Voltage Doublers

Can you explain the basic reason why boost converters seem to be more popular than voltage doubler circuits for load bearing output? I have built these two circuits in the simulator and they both ...
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1 vote
1 answer
76 views

Boost output impedance simulation

Does anyone know how to measure the output impedance with SIMPLIS? below is my circuit, But the result at low frequency is wrong, it should be flat, anyone knows what happened in my simulation?
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1 vote
1 answer
50 views

How do I drive a 3V motor with an MCU+FET, when turning the motor on causes a voltage drop to 1V at the MCU?

I have a simple circuit; an MCU, a FET and a motor. The MCU drives a low side TN0702 FET which completes the motor circuit. Quite simple, so not sure if understanding the problem requires a schematic, ...
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2 votes
2 answers
112 views

Can a 3.3V 170mA (peak) device be reliably powered from only 2.5V?

I'm upgrading/hacking a broken device for a hobby project, so pretty academic and mostly out of interest. The case has a battery compartment designed for two C batteries in series (providing 2.5V to ...
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2 votes
1 answer
225 views

Boost converter doesn't work

I made a boost converter based on the below schematic. I want to use this to create 18V. When I connect a 12V powersupply to the connector P3IN, I only measure the same 12V at the output on connector ...
10 votes
2 answers
1k views

Voltage selector design problem

I designed a 5/24Vout voltage selector circuit with the schematic design that I drew below: By bridging either Pin 1-2 or Pin 2-3 of J6, I could have two different voltage dividers leading to two ...
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2 votes
2 answers
84 views

Which topology should I use for energy harvesting

I am making a energy harvester design but am confused which of the following circuit should I use to amplify and filter my harvested voltage. The first topology is the synchronous switch harvesting on ...
0 votes
1 answer
135 views

DC-DC boost converter theory / principle / testing

I am trying to setup a DC-DC boost converter circuit that can convert 50-60 V DC to 86.4 V at the most current I can achieve a reasonable efficiency of say 90%. Mostly for the learning curve but my ...
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1 vote
1 answer
68 views

Salvaged magnetic materials for low performance 1MHz boost converter

I am wondering if I could modify a MT3608 boost module by winding a custom inductor / transformer for it, to generate a kV range voltage (at sub mA current). I'm thinking of replacing the 22uH ...
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3 votes
1 answer
35 views

Output capacitor for a boost converter in DCM

I'm designing a boost DC/DC converter for a backlight (it needs to be constant current but it's not relevant to the question). Starting from a 5V preregulated rail I need to go to about 25V 30mA; ...
11 votes
6 answers
831 views

How to filter out the switching noise from a DC/DC converter

I've set up a power supply using a MAX632 DC/DC Boost converter to bring up voltage from a small 4.5V battery, then I'm using a LM2940CT-5.0 linear regulator to bring it back to 5V, which the voltage ...
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3 votes
1 answer
161 views

Why is this boost converter circuit outputting a lower voltage than expected? [closed]

I'm working on a boost converter board to power an OLED display, specifically a Midas Display MCOT128064SV-WM, off of 5V USB bus power (the VBUS pin on a Raspberry Pi Pico powered via USB). I ...
0 votes
0 answers
43 views

Feedback circuit for implementing CC/CV in DC/DC switching circuits

My goal is to design a 10s lithium battery charger with the ability to vary the output current depending on what power adapter is used. For this I want to use the LTC3786 boost converter and the ...
2 votes
3 answers
280 views

How to reduce NPN reverse base current on this interesting "Super Efficient Joule Thief"?

Note: The question part is the fixing of the negative current at the transistor base. It looks like there's a problem with negative current at the LED(s) -- this is not expected to be answered in this ...
1 vote
2 answers
115 views

Step-Up Converter Design

I am trying to design a step-up converter with the following specifications: Vin: 3.0 - 3.7 V Vout: 30 V Iout(max): 50 mA With such a high boost ratio, my calculated duty cycle would be ~92% which ...
0 votes
0 answers
39 views

Boost converter Controlling problem when transfer from light load to heavy load

I built a boost converter to boost voltage from 200V dc to 400V dc. Power rating is 5kw, I added a PID to regulate the voltage. The problem is, when going from light load to heavy load, output voltage ...
1 vote
1 answer
96 views

SPI level translator

I'm planning to connect an IT8951 to an ESP32 through SPI. The issue is that the ESP32 module that I'm using has an output of 1.8V and the IT8951 works with 3.3V SPI. What kind of circuit should I use ...
1 vote
0 answers
48 views

Boost converter design. Current issue

Currently trying to make a boost converter working at a frequency of 100kHz. For the design, I used the equations shown in https://www.ti.com/lit/an/slva372c/slva372c.pdf , my requirements for the ...
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2 votes
3 answers
279 views

Boost converter inductor calculation

I am designing a boost converter with the following parameters: Vin: 3.0 - 3.7 V Vout: 30 V (nominal) Iout(max): 10 mA Fsw: 600 kHz TI's application note has the following equations for boost ...
0 votes
1 answer
56 views

Picking components

I'm an electronics student and I'm currently working by myself on a DC-DC booster converter. By now I have already completed the simulation, and I'm currently selecting components in order to go make ...
1 vote
2 answers
67 views

Output load current less - DCDC Converter [closed]

I'm using this Boost converter. 3.6V to 12V with a load current 300mA. 10uH is the inductor used. But I am only able to get a maximum load current of 120mA. What might be the reason?
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4 votes
1 answer
197 views

Switching frequency data not available

Why do some dc-dc buck or boost converters do not have the switching frequency value in their datasheet? For example: Link does not have switching frequency ? Is it possible to get power dissipation ...
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-1 votes
2 answers
55 views

parallel boost converter for more current [duplicate]

I have a boost converter that takes 3-5V at input and outputs a steady 5V (This one : https://aliexpress.com/item/33046073847.html). I plugged it to my 18650 battery cell so that I can power an ...
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0 votes
0 answers
80 views

Boost PFC power loss calcaulation

I am studying boost PFC topologies. I run into a question, how to calculate the CCM / CRM /DCM boost PFC power loss. I read the On semi document. I would like to derive the Diodes RMS current, but I ...
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3 votes
3 answers
173 views

How can I measure the output of a voltage booster circuit?

I made this circuit, which was described on-line as a "transformerless Joule Thief." I was able to light four LEDs of varying forward-voltage in series, but I couldn't figure out how to use ...
1 vote
0 answers
369 views

Operation of the generic ka7500(tl494) based boost board and soft start adaptation

I am examining the operation of a boost card found in many cheap inverters, with a KA7500, EG7500 or tl494 IC type. Here is the diagram that can be found everywhere: My question are: what is the ...
0 votes
0 answers
44 views

Charging board cuts out when unplugging USB cable

I’m using a Lithium battery charge/discharge board with 5V regulator and USB-C input to power a gaming handheld. It’s important that I be able to run the handheld and charge the battery at the same ...
0 votes
1 answer
72 views

Bigger NTC = better protection?

A 2.5 ohm NTC is used in the following PFC booster. I've got a 20 ohm one. Can I use it instead of 2.5ohm one? Does it provide better protection or does it disturb the normal operation of the circuit?
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0 votes
1 answer
61 views

Boost converting 0.5V PV output to charge a super capacitor

I want to charge three 2.5V 700F super capacitors in series (7.5V total) to a precise 6V so that I avoid overcharging a single capacitor in the string. (Conservative 80% voltage to avoid having to ...
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1 vote
1 answer
145 views

Why did the CS resistor explode in this circuit?

I implemented the following PFC boost converter as shown in the second image and plugged it into 220V with the no-load condition but it exploded at the plug-in. The explosion happened in the sense ...
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0 votes
1 answer
68 views

Is there any problem to test the following topology without load?

I've implemented the following PFC boost 80W converter. Is there any problem to test the following topology without load?
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6 votes
6 answers
1k views

Boost voltage without switching

What I am doing: I am making a wearable device which will use Li-po battery/ies to operate. I am measuring small currents (meaning I want to avoid buck/boost converters). My design draws a current of ~...

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