Questions tagged [boost]

A non-isolated DC/DC converter topology.

Filter by
Sorted by
Tagged with
0 votes
0 answers
33 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 ...
user avatar
  • 379
0 votes
0 answers
22 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 ...
user avatar
0 votes
0 answers
38 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 ...
user avatar
0 votes
1 answer
38 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?
user avatar
  • 457
0 votes
1 answer
47 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 ...
user avatar
  • 211
1 vote
1 answer
122 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 ...
user avatar
  • 457
0 votes
1 answer
67 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?
user avatar
  • 457
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 ~...
user avatar
4 votes
2 answers
759 views

What's the purpose of the Zener diodes in this boost circuit?

I am looking at this boost converter for stepping up voltage to charge a Li-ion battery: It looks like a standard boost topology, but I am new to this and am wondering: What is the purpose of the ...
user avatar
0 votes
0 answers
52 views

Why did my power system suddenly stop working?

I've created a wearable device with a power system that is replicated from the Adafruit Powerboost 1000. It contains a charger and booster chip. It worked for several days until the red LED that ...
user avatar
2 votes
2 answers
82 views

How would you generate a negative rail of -50V with a current of 100mA using a positive 50V generated by a battery powered boost converter? [closed]

Please I really need suggestions on this. I want to generate a -/+50V dual-rail at >=100mA supply for a circuit I am working on. I bought 2 copies of this boost converter module from Amazon and it ...
user avatar
  • 21
2 votes
1 answer
63 views

In calculating the inductor for a boost converter, where does the power of the voltage source calculate in?

simulate this circuit – Schematic created using CircuitLab As I am using LTspice to develop different types of dc-dc boost converter topologies and wanted to define the best inductor to use when ...
user avatar
  • 143
1 vote
2 answers
108 views

What is the purpose of this block in UC2854 based PFC circuits?

Below is a snippet from the datasheet of UC2854. Current transformer senses the input current of PFC. But Rs also does the same. What is the square block shown here?
user avatar
  • 2,051
0 votes
2 answers
62 views

Input current and output current in boost regulator

How can the input current of a boost regulator be more then the output current of the same regulator when the load has a set current draw. For example going from 5V to 12V with a load of 2A. The power ...
user avatar
  • 13
0 votes
0 answers
34 views

Briefly Drive Permanent Electromagnet [duplicate]

I need to drive a 12VDC/1.2A permanent Electromagnet for 2 seconds (to release object). Will the attached circuit be able to do that or do I need something else? Thank you https://imgur.com/wxmRo7w ...
user avatar
  • 1
0 votes
2 answers
49 views

Diode placement for AP1603 boost regulator

I'm working on a circuit using the Diodes Inc./Anachip AP1603 boost regulator. The datasheet (linked above) notes: Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 ...
user avatar
  • 1,306
0 votes
1 answer
85 views

Boost PFC converter stepping up voltage but unable to shape the input current

So, I have designed the following boost PFC circuit in simulink: This is the DC output voltage: But this is the input current: I am trying to tune the PI control but nothing works out. The PI ...
user avatar
1 vote
0 answers
104 views

Boost Converter Design with TL5001 PWM Controller

I am trying to design and build a boost converter with the TI TL5001 PWM controller, to convert 9VDC to 400VDC to supply a Geiger-Muller tube. This is my first boost converter with an analog ...
user avatar
1 vote
2 answers
149 views

How to turn 9V DC to 300V DC?

I recently acquired a capacitor from an old power supply - 400V 120uF. I want to be able to charge it, preferably without being connected to mains. I'd like to do this with a 9V battery (or any other ...
user avatar
0 votes
1 answer
90 views

How to design an SMPS boost converter with MAX1771

I am trying to design a switch-mode boost converter using a MAX1771. As far as I know, when designing this kind of converters there are a few parameters that must be set. In my case these are: Vin = ...
user avatar
0 votes
2 answers
73 views

Parallel inductors in boost converter topology

I need to design a boost converter using a 750uH boost inductor after calculations. But I just have 3 inductors each 2.2mH. Can I put these 3 inductors in parallel? If no why? What is the drawback and ...
user avatar
  • 61
2 votes
1 answer
110 views

Is this boost converter feedback technique a good idea?

I am in need of a high voltage supply, capable of 15mA at around 200V for a valve/tube preamp. This supply has to be low noise and any switching noise kept out of the audio band. The incoming voltage ...
user avatar
  • 147
0 votes
0 answers
31 views

Input Boost Low-Harmonic Rectifier

I have a question from Coursera, Please see the below figure. I don't understand what does question 13 means, could someone explain it to me? When Vref2 increased by 4%, the output voltage doesn't ...
user avatar
  • 349
0 votes
0 answers
25 views

Boost PFC inductor ripple

I am curious about how to calculate the inductor ripple of a boost PFC. Because the input voltage doesn't have a constant value, the ripple is related to Vin, so when the boost PFC works, the inductor ...
user avatar
  • 349
2 votes
1 answer
72 views

Perturbation and linearization for boost converter

I'm developing a boost converter (runs with DCM, and has \$n\$ turns ratio transformer) for uni which controls the input voltage with a constant output voltage. I'm at loss on how to get the transfer ...
user avatar
2 votes
2 answers
115 views

How do I power a board multiple sources including USB without exceeding the capacitance limit on USB power?

I'm not entirely sure how to ask this because I'm just a hobbyist . . . but here goes. My daughter and I are working on a PCB for next year's pinewood derby car (I call it the Carduino). It's base on ...
user avatar
10 votes
2 answers
237 views

Is a balancing diode really necessary for the Balanced Boost converter?

Please pardon all of the information that precedes the question -- I didn't want you to actually have to go read the paper itself. This question is in two parts, but they are really equivalent, so it'...
user avatar
0 votes
3 answers
129 views

Why doesn't my battery pack run a 12 V lamp very long?

I am new to this forum. While I have been experimenting with electronics for years, I guess I am still a novice. Please help me understand why my battery pack doesn't run a 12 V LED lamp very long. I ...
user avatar
0 votes
0 answers
38 views

Readjusting a wide range input power supply for higher wattage output. What components if any need to be adjusted?

Currently I am looking through the circuit design and component selection for this 30-W Ultra-Wide Range Power Supply for Protection Relay ( https://www.ti.com/lit/ug/tidu231/tidu231.pdf?ts=...
user avatar
  • 187
0 votes
1 answer
71 views

AL8853 Boost LED driver does not oscillate

I realized this board from my schematic based on the AL8853, a boost LED controller. My circuit is calculated for a high power design (735 V LED output, 350 mA LED current). Before powering my board ...
user avatar
  • 61
0 votes
1 answer
73 views

Does the PFC stage adjust its output power depending on the load requirements of downstream converters?

I am trying to calculate the overall efficiency of a PFC+flyback converter. The PFC boost converter has an efficiency of 0.9 and the flyback an efficiency of 0.89. Depending on the load which requires ...
user avatar
  • 77
-1 votes
2 answers
75 views

Can I use a DC-DC boost converter to increase voltage at one part of a circuit, to ultimately increase current in a later part of the circuit?

As you can see in the example above, I want a target current across my 50 ohm resistor of 4 A which would require a voltage of 100 V, but my power supply is only 10 V. Can I use a boost converter (as ...
user avatar
3 votes
5 answers
187 views

Boost converter IC layout fails with increased load

First post on here and not very experienced so let me know if there's anything wrong with my post as well as my design. I am trying to layout a boost converter using the PAM2421AECADJR IC I bought as ...
user avatar
0 votes
0 answers
71 views

Boost converter shorts out the power supply under load

I'm building a DC-DC step-up (boost) converter using TL494. The schematic is attached Input voltage: 9V The resistive divider at the output sets the output voltage to about 14V Desired output current:...
user avatar
0 votes
1 answer
48 views

Splitting output power of a PFC stage to three flyback converters

I want to design three flyback converters whose input is taken from a single power factor correction circuit based on boost converter topology. The PFC stage delivers 200 W (400 V, 0.5 A), and I want ...
user avatar
  • 77
1 vote
1 answer
145 views

Problems with TL494 boost converter

I'm building a DC-DC step-up (boost) converter using TL494. The schematic is attached Input voltage: 9V The resistive divider at the output sets the output voltage to about 14V Desired output current:...
user avatar
1 vote
1 answer
207 views

Increase switching frequency of boost converter with MAX1771

The MAX1771(always in DCM, has no oscillator) was chosen as controller for minimum component count: no error amplifier compensation, no slope compensation, no current feedback RC filter, no external ...
user avatar
  • 337
0 votes
1 answer
80 views

LT3966 LED driver design

I have 2 strings of LED which have 6 LEDs in series. Initially, I considered using one CC boost module and a matrix dimmer, or a single driver with multichannel load switches to control the strings ...
user avatar
0 votes
2 answers
66 views

Boost converter output does not match sim

I'm experimenting with a simple boost converter. However, the measured output value on the breadboard is nowhere near what I expect : Simulation in LTspice gives about 4.5V while I'm measuring about ...
user avatar
  • 144
1 vote
1 answer
62 views

2.7-4.2 V Li-Ion battery to 5 V 5 A converter [closed]

I have a 2.7-4.2 V Li-Ion battery. I want to convert this battery to boost 5 V-5 A power supply for a short time usage. I know there are lots of ICs to convert these values but I need advice for which ...
user avatar
  • 158
0 votes
2 answers
85 views

Can I use a boost converter as a batteries replacement?

I have two 12V car batteries in series that control a stepper motor system, my question is if I can raise the voltage to 48V using a step-up converter (with the necessary power obviously) to increase ...
user avatar
  • 1
2 votes
1 answer
91 views

Is it possible to use two DC-DC boost converters in series from separate DC sources?

I was wondering if I could put two DC-DC boost converters in series. Each of these converters is fed from a DC source which is basically a USB charger of 230VAC to 5VDC/1A. The voltage output of these ...
user avatar
0 votes
2 answers
118 views

How does current flow in this circuit with multiple power regulators?

I have the following circuit: simulate this circuit – Schematic created using CircuitLab U1 contains two voltage regulators (Vo1=+10V, Vo2=-10V, input Vin=5V). (These could be buck, boost etc. ...
user avatar
  • 1,208
0 votes
1 answer
89 views

2S BMS shuts down by itself

I made a small 2 DC motor Arduino robot car which is powered by two 18650 cells. I am using a 2S BMS with a TP5100 to charge and protect my cells. I am using a DC-DC boost converter to make 9 V to ...
user avatar
4 votes
5 answers
444 views

Low performance in the MC34063 chip. Wrong BJT voltages, out of spec timings - how not to trust a datasheet

EDIT at the bottom. Referring to a previous question which I solved, it was related to a inverting boost configuration of the MC34063 with the following arrangement: Picture 1 I realized my circuit ...
user avatar
  • 1,228
4 votes
4 answers
913 views

Do boost converters have a minimum Vin/Vout difference?

Popular buck converter modules specify a minimum Vin/Vout difference, something like "Vin must be at least 1.5V higher than Vout". But I do not see such requirements for boost converter ...
user avatar
0 votes
0 answers
80 views

H-bridge with 0-3.3 V output

I'm planning on using a H-bridge to generate biphasic pulses using two PWM output from MCU with 3.3 V logic. The output voltage of the H-bridge is fed into a differential input of a high voltage piezo ...
user avatar
  • 57
1 vote
0 answers
47 views

LTC3813 Boost Converter design help

I'm working on a boost converter design for a lawn tractor conversion to electric. I use a 90v PMDC 2.5 HP motor (21 Amps nominal) from an old threadmill for load and 4 12v 100Ah AGM batteries in ...
user avatar
0 votes
1 answer
84 views

Why are 3 wires connected to the potentiometer? [duplicate]

It is a LM2577 boost converter schematic. In page 20 of datasheet: VOUT = 1.23V (1 + R1/R2). Here R1 is the 100k potentiometer, R2 is the 2k resistor. Why are 3 wires connected to the potentiometer? ...
user avatar
  • 208
5 votes
4 answers
1k views

What on a digital PCB could affect the boost converter output?

I have designed a fixed 12 volt boost converter module and it works. I tried to implement the same booster on my project PCB, but with all same components it can't provide 12 volts when it gets any ...
user avatar
  • 377

1
2 3 4 5
20