Questions tagged [boost]

A non-isolated DC/DC converter topology.

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53 views

Boosting an analog voltage signal

I have a 0-3.3V analog DC signal and want to change that into a 0-5V analog DC signal? How should I go about doing this? An op-amp? DC boost converter? If it is an op-amp, what does the circuit ...
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175 views

An inverter without a transformer?

I am trying to build an inverter without a transformer. I want to use a 12V battery connected to a boost converter which will boost the 12V to 120V, then simply attach an H-bridge to the 120V boost ...
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44 views

MOSFET Switching Loss Formula

I'm trying to calculate the switching loss of the MOSFET which is used for a DC-DC Boost converter. Input Voltage : 9V-16V Output Voltage : 30V Output Current : 0.3A. Switching Freq : 455kHz Based on ...
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31 views

Energy Harvesting Circuit Utilizing MOSFET Based Bridge Rectifier

I really need help, I am working with an AC/DC semi-active boost rectifier, I replaced the two diodes on the high side with N-channel depletion-mode MOSFETs as an ideal diode that can lower power ...
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1answer
53 views

CCM, DCM and BCM - Inductor

In a boost converter, what is the factor that determines whether the power supply (dc-dc converter) will be in the CCM, BCM or DCM mode? Because, I have an LED Driver A80604. And I am trying to ...
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2answers
37 views

Boost converter inductor selection - inductor ripple current calculation based on input current or output current?

I've a question regarding the inductor selection in a boost converter. In this TI App note under Inductor Selection on page 3, it is asking to assume the inductor ripple current as a percentage of ...
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1answer
34 views

Battery charging with boost converter topology

I'm designing a circuit for battery charging, which will make use of boost converter topology. I have determined the input/output voltage and current parameters for the circuit. If I put a resistor at ...
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51 views

What is the best location of a (damped) LC network here?

I'm using this circuit to create the analog supply in my usb-device: After the high-side switch, the incoming 5V is boosted to 5.5V and then regulated back down to 5 volts. The entire analog part ...
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2answers
32 views

Why is the Irms so different from Isat in different power inductors?

I'm looking at power inductors for a DC-DC boost converter clocked in the 500KHz range (but KHz could change if necessary). Here are two examples: Example 1: Irms=55A, Isat=140A, 70nH Example 2: ...
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4answers
86 views

„Power circle“ - first buck then boost for converter testing

I would like to test the efficiency of some buck converters. I am thinking of using two current sensors like INA219 (or similar) connected to an Arduino and using the serial monitor to gather data. ...
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51 views

Why is the 2.2k resistor needed in an MT3608 module?

I am trying to implement an MT3608 module on my PCB. I went through its schematic which clearly describes the module. I see they have used 2.2k ohm resistor in addition to a potentiometer. From what I ...
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1answer
35 views

Regarding boost converter and current sink IC operation

I have a doubt regarding the use of a boost converter and a current sink. This doubt arises based on the following -very simplified- circuit. Following the attached circuit, the boost will take the ...
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1answer
82 views

DC-DC boost converters in parallel to run DC motor

Our aim was to power the motors of our bot (which were selected according to the torque requirement of our bot) using a single AAA Battery but due to limited time and and the difficulties in ...
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1answer
62 views

Using a ferrite core transformer as an inductor for a boost converter

I am trying to make a boost converter. I'm stepping up 5V to 12V. I have all the required components, including a power MOSFET(IRLZ44N), a Schottky diode (SR260) and an astable multivibrator that ...
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1answer
43 views

TPS61046 wrong output voltage and high current consumption

I am designing a circuit to control a multiplexed led matrix and for that I am testing two boost circuits. The TPS61046 and the TPS61080. My idea is that the input voltage is via USB or a Li+ coin ...
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1answer
43 views

Modifying the MT3608 DC-DC Boost convertor

I am using the DC-DC boost converter MT3608 for a project where my input ranges around 1 V. Is there a way to modify the circuit so that the boost converter can operate at voltages less than its ...
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1answer
43 views

LED Driver Pin function

I have this LED Driver - A80604 I need to generate 30V for my LED Driver String for generating 300mA. In a previous question, I received an answer that I need to fix the current using the LED Driver ...
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2answers
78 views

Problem switching boost converter using 2N2222, which turns on an RF transmitter

I am using a 2N2222 transistor to switch on and off the input supply of boost converter. The output of boost converter is powering my RF transmitter and voltage regulator which is used to provide 5V ...
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37 views

MPPT Three-Phase Rectifier - BLDC Generator Project

I'm building a MCU controlled 3phase rectifier that allow voltage and current control. The generator is a BLDC motor (Kv=100, Imax=30A, Poles arrangement=36N42P). It will produce from 16v to 50v ...
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1answer
38 views

TPS43061 simulation problems

I started working on a single series lithium to 15V / 2A Boost converter based on this design: https://www.ti.com/tool/PMP8921. I got this PSpice simulation model from TI themselves here: https://www....
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2answers
46 views

MC34063 Output Voltage Sagging

I am working on a project where I have used MC-34063 boost supply on 3 pcb's and all the 3 places I have the same issue ie output voltage is steady on open circuit, but soon as ANY load is connected, ...
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62 views

Boost converter single cell AA battery not delivering enough voltage when connected to Wemos D1 mini

I must power a Wemos D1 mini at 5V (more on that below) (along with 4 LEDs and a DC motor) with a single cell AA battery. I have tried 2 boost converters (Vin 0.9V-5V) and none worked. I need 5V for 2 ...
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1answer
83 views

4 Layer PCB Local Pours on Signal Layers

I'm in the middle of placing components on my first 4-Layer PCB. Layers are Sig-GND-Vcc-Sig. I2C/SPI/UART, up to 20MHz MCU, nothing exceptionally fancy. I have decided to check with the community ...
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1answer
58 views

LED Driver IC Current Setting and Switching Frequency

I have this Boost LED Driver IC and this IC is new to me. So, I require some help on how to set the current for my LED String of 300mA. 9LEDs with each forward voltage of 3V and forward current of ...
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1answer
38 views

How to set the boost output voltage in this IC?

I want to use this boost IC to drive an LED string. I have 9 LEDs. 300mA forward current and 3V as typical Vf. Can someone guide me on how to set the output voltage of the LED string using that IC?
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100 views

Is it a good idea to use a ceramic inductor for a DC-DC boost converter instead of a wire wound one?

I would like to use an SMD assembly service in order to pick and place the components directly to my PCB. There is a DC-DC boost converter (DD06AJSA) on the board which includes an inductor: I need ...
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4answers
231 views

How does this control loop work?

The following description is taken from maximintegrated website (this link specifically), and after reading and trying to analyze the control technique it still does not make sense to me: 1 - In the ...
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1answer
110 views

How to use 18650 batteries and increase voltage from 3.7v to 12v

Im trying to do a DIY RC car with uses two 12v motors as well as some LEDS servos and Arduino components. I was planning on using two 3.7v 2600MAH 25A 18650 battery cells on parallel to have a bigger ...
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1answer
51 views

DC-DC Boost Converter simulation

Im running a few simulations with an energy harvesting project using Peltier devices as a Thermo-Electric Generator with PSPICE for TI. The chip powering the boost device doesnt have a pspice model ...
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1answer
163 views

LTspice - “Fatal Error: In Missing node(s)”

I created the boost conveter in LTspice software, but when I try to run the simulation, there was an error message saying: Fatal Error: In Missing node(s). Can ...
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1answer
51 views

How to achieve feedback in regenerative braking?

I’d like to implement regenerative braking in my own brushless ESC I’m designing. I’m stuck however on the part regarding voltage step-up. As I understand it, ESCs during braking usually use the motor ...
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1answer
24 views

Using xl6009 on a 5v powerbank circuut

I want to use xl6009 boost converter on a 5v 2 amp powerbank circuit to power up my 12v amplifire amplifier load is 750ma. What you guy's think about this. Please answer my question ASAP. (sorry for ...
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55 views

Boost converter depending on load

TL;DR: Output voltage of boost converter depends on load. I assume because the load is altering the voltage between the base of the boost transistor and ground, thus altering the duty cycle. No idea ...
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2answers
44 views

Understanding the voltage across the inductor in a boost converter

I am studying boost converters in my power electronics class. Something I cannot wrap my head around is the voltage across the inductor. When the low side switch (the switch connected to ground, see ...
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43 views

MAX608 boost converter stopped working, the OUT pin is shorted to ground

I was working on a little project to convert 3.7V from a lithium ion cell to 5V using a MAX608 boost convertor IC. I put the required components according to page 7 of the data sheet and everything ...
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1answer
38 views

Can MCP16251/2 DC-DC step-up converter tolerate higher input voltage than the set output voltage?

I am trying to figure out the best possible circuit for MCP16251/2 feeding from 2 AA batteries in series with an output of 3.3v. MCP is extremely efficient boost converter with very low quiescent ...
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39 views

Boost converter, why the voltage derates when frequency rises?

I am simulating a boost converter in ltspice. vin=3V, vout_bst=12V, ideal inductor, capacitor, diode and voltage source. When I use an ideal switch, raising the frequency doesn't affect the output ...
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17 views

Power backup for NiMH battery

I have a device powered by a 5S NiMH battery. The device sounds a low voltage alarm at 6.6v. When fully charged, the NiMH reads around 7v or higher. I have a few small boost converters. Could I hook ...
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1answer
74 views

Redirection of electric current in a circuit

I'm new in electrical engineering so apologies if I sound like an idiot but I just can get this question out of my head. Suppose you have a DC fan running which is powered by a battery. The ...
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1answer
63 views

18650 Cell boost converter to 4.8v (not 5v)

I have a torch in which 3 AAA cells are put in (1.6 (new AAA) * 3 =4.8v). The problem is these are not long lasting and i have to change them after few days. What i am looking for is a rechargeable ...
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11 views

TPS61090 used for 5V from LiPo, not turning on with USB input

I inherited a circuit design with MCP78371 (U1) and TPS61090 (U2). When USB is applied, U1 outputs V-USB to U2 for boost to 5V (to power a very small motor (180mA) and LED backlight (90mA) on a LCD ...
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1answer
69 views

TENS unit design

I've been working on a circuit to amplify TENS signals. The initial signal is coming from a phone which is then amplified to about 31 Vrms(~20 peak to peak) and then connected to the human body ...
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1answer
86 views

Boost converter extremely low efficiency

I'm trying to use a boost converter from Pololu that steps up my 1.25 input voltage from a AAA battery to 5V in order to power an Arduino. I have found that my Arduino needs .03A to be powered. I ...
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1answer
49 views

Inrush current in the Boost Converter during start

I am making a 400V 1kW boost converter but in the LT-SPICE simulation, it is drawing a huge current of 50-60A at the start for 1ms-3ms, but the current comes down to 12A after that. The inductor ...
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47 views

MC34063A: Problem with obtaining step-up performance

I am working with a MC34063A voltage regulator in order to prototype step-up power management solution, with control logic to switch between three different output values. I encountered some issues ...
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2answers
55 views

Step up 3.3V to 5V and draw 500mA without a voltage collapse/break down

I would like to step up 3.3V from my power supply with the help of a dc-dc-boost converter to 5V and then I want to draw 500mA by placing a 10 Ohm resistor between the output-pin of the boost-...
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44 views

PWM controller IC selection

I am working on a boost converter with analogue PI control. I want to make the PI controller using a separate Op-amp IC and giving its output to the PWM controller to generate proportional PWM signal. ...
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3answers
146 views

Initial Transient Response of Boost Converter

I have been reading about switched-mode DC-DC converters and I'm having some trouble fully understanding the behaviour. Take the following circuit for example (no feedback loop): I understand there ...
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2answers
102 views

How does increasing the capacitance affect the output voltage for a buck converter and boost converter?

From the formula of charge relating capacitance and voltage, $$ Q = CV $$ Capacitance is inversely proportional to voltage. This is how I got the idea that possibly when increasing the capacitance, ...
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1answer
60 views

Is there a mathematical representation that represents the output voltage of a buck or boost converter in discontinuous mode?

Recently I have learned that in buck or boost converters, the output voltage depends only on the duty cycle and input voltage in continuous conduction mode or when current is continuous. However, in ...

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