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Questions tagged [switch-mode-power-supply]

A switch-mode power supply (SMPS) switches been fully-on and fully-off states quickly to maintain voltage regulation. They offer lower power dissipation and run cooler than linear regulators that continually dissipate power through a transistor.

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26 views

Maximal operational pressure of tantalum and electrolytic capacitors

I need to design a device that have to operate in an high pressure environment (Nitrogen gas). The operational pressure may vary from 1bar (atmospheric) up to 20..30bar gauge pressure. The regular ...
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42 views

Reducing AC/DC adapter (SMPS) output voltage

I have a AC/DC adapter P-1650-22 (used to power a notebook) laying around. I would like to use it for other purposes, i.e. as a constant voltage source for LEDs. The problem is, that the output ...
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54 views

Need to resolve a trasient on the Output of power supply

I am designing a fly-back SMPS AC/DC topology power supply, i mount the PCB and when i tested it with a restive load (hot air stove 230V@600Watt-50Hz) y see that on the DC output appears a transient ...
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1answer
69 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
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1answer
56 views

How to modify a small power supply to not require a 20W load to turn ON? [on hold]

I have a couple of obscure german “AT60” power supplies I scavenged from some designer lamps. They’re small, and don’t get hot even under ~30W load — but for my purposes, I need them to be always on, ...
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76 views

Why did my Teensy 3.6 break?

My battery-powered circuit is supposed to collect data from some sensors using a Teensy 3.6. It worked for a few days (maybe 1hr total of uptime) and then something broke. All of the sensors and power ...
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43 views

AC voltage at the output of SMPS

We have 230 VAC power supply in our lab.A chemical earthing is done for this power supply. I have connected a SMPS (LRS-35-12) to it. The Output of SMPS is connected to a load of maximum 2A. I have ...
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21 views

Designing an inverter with its DC volt and gnd connectors as multi-pins along the PCB, how do i lay out my decoupling capacitors?

Should I distribute multiple decoupling capacitors along the connector rails? Or Should I have a few large capacitors centralised? Is there a mathematical way to evaluate this? Any other methods ...
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1answer
15 views

CL8800: how RC bridge regulate the tap current?

As in CL8800 datasheet, page 8, the document refers to simplified block diagram (Figure 3-6) How do I calculate the value or R_SET for controlling the amount of current in each tap? What is the ...
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0answers
30 views

SMPS Flyback transformer selection

I am trying to design a SMPS for a project (I have to make a custom one for integration purpose). This SMPS have universal input (85-265V AC at 50 or 60 Hz) and an output of ideally 53V (but it can ...
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2answers
56 views

Choosing inductor and capacitor for boost converter

I am working on a IoT project that involves an arduino and a 4G LTE module. The device will be operated with two Alkaline batteries. Both the arduino and LTE module require 3.3V input so I want to ...
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1answer
59 views

Arduino 2 power source - auto switch?

I'm planning to switch between two power sources DC and USB with an Arduino like below diagram. What I'm going to do is cut off the DC V+ wire when I insert the USB jack to the Arduino for uploading ...
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46 views

Hybrid Boost-Flyback Stability Issue

I tried to design a step up SMPS to create ~200-300v from a 24V input with an expected power of ~12W max. Since the project is for a hobby, I chose to attempt a hybrid boost-flyback converter to get ...
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2answers
117 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
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0answers
44 views

What factors should I consider when choosing a high amperage power supply?

I've searched around, but I haven't found an answer to this particular question yet. I'm building an elecromechanical project which requires somewhere around 60 Amps at 12 Volts. While this may not ...
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2answers
56 views

Is there a dual row edge connector that is connected a the edge of the PCB, with one row connecting to top side, the other to bot side?

I do not want a card edge connector that sits on neither the top or bottom of the PCB, I need one that sits parallel to the PCB board.
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2answers
36 views

i dont want to change voltage but only regulate input voltage

It is my first power supply project. I will supply 300 watt vehicle audio amplifier with this supply. I will use nominal 24V and 14A at my system Vehicle input 24V and my amlifier 12V-30V but when i ...
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1answer
53 views

Switching Mode Power Supply Fluctuating Output

I designed a switching mode power supply using LNK-562, I share the circuit schematic below. Note that NTC, fuse, and the input filter inductor is replaced with shorts in the real circuits. I am ...
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21 views

Designing a CCM Boost PFC rectifier circuit

I am working on designing a CCM Boost PFC rectifier circuit, supplying up to 2.8kW at 400Vdc nominal, while taking 230Vac, 50Hz controlled via negative feedback in the average current control mode. I ...
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2answers
75 views

PID vs Bang-Bang - which one is more stressing on components?

This question is regarding a 3D printer, specifically its heat bed. The head bed is a PCB heater with a resistance of 0.9 Ohms, so it's drawing around 13 Amps when supplied with 12 Volts. I recently ...
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1answer
49 views

Boost Converter (TPS61322): Loop Stability with Large Capacitors

I am using a TPS61322 boost converter to convert a minimum of 1.3V (single-cell alkaline) to 3.3V (using the TPS613221A version). This device needs two passives: an input inductor and an output ...
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41 views

Where to get datasheets for this part: ZJL JL2233 1650M18 ?

I am currently reverse engineering an LED Driver (STARES LED DRIVER; Model No.: WLJ-60-50) for my LED Lamp where the lamp doesn't turn on anymore. The trouble I have with this PCB is that i can't ...
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1answer
71 views

How to connect the power planes of 2 PCBs with the least stray inductance?

By the nature of my project, I am designing 2 power electronic boards that are supposed to have its high power main voltage and ground plane connected together. Can you recommend a type of connector ...
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2answers
157 views

In SMPS , why does peak current mode control have lower gain for inner loop compared to average current mode control?

This has been bothering me for a while. In some of the design notes of power management ICs , it is mentioned that peak current mode control has 'lower gain - wider bandwidth' inner loop compared ...
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38 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
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1answer
66 views

What's causing my buck converter's switching node to oscillate only some of the time?

We got an order of 24 PCBs recently, and one of them doesn't work. I'm trying to track down the point of failure, and it seems to be our 3V regulator circuit: At ~180ms intervals, the 3V output rail ...
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1answer
180 views

How to safely generate 200V from low voltage supply

Unfortunately, this post requires quite a bit of background if it's going to be useful to anybody (including me). I have been trying to build a relatively high voltage power converter for part of my ...
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1answer
51 views

Through which route an SMPS propagates and picks up the switching noise?

I have seen that some switch mode power supplies are injecting noise to the electrical power network. I guess this noise is common mode noise. That switching noise then propagates through and enters ...
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3answers
76 views

Design of synchronous buck converter: What's “ripple voltage”?

I am designing a synchronous buck converter for variable input from 12 to 36 V and output fixed at 14.4 V. The power is 400 W and switching frequency is 50 kHz. While designing I came across 2 terms. ...
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1answer
44 views

Is the meshed metal cage connected to the earth terminal in these embedded power supplies?

The SMPS below has screw terminal mains entry as line, earth and neutral: Is its meshed metal cage in general connected to the earth terminal internally? I could check it if I had one but at the ...
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2answers
56 views

Are the ground wires and the earth creating a loop in this system?

Below in the photo both SMPS power supplies powers some DAQ boards. I named them as 12V PSU1 and 5V PSU2. As you see the PSU1 and PSU2 are daisy chained at their mains entry(line, neutral, earth): ...
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Using a 12 V 3 A bilge pump on a 12 V 8.5 A LED power supply

I recently bought the following for a grey water system project I'm working on: 3 x 12 V, 3 A bilge pumps 1 x 12 V 12.5 A power supply I'm not an electronics expert, so my assumption was that the ...
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1answer
52 views

Adjustable non-inverting Buck-Boost converter failing right after starting in boost-mode

I am designing an adjustable non-inverting buck-boost converter based on LM5176 chip. Adjusting is done by DAC via feedback network, more on that technique can be found here. The input voltage is 32V ...
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0answers
29 views

What is the voltage gain of the converter

Please refer the following figure: This is a small signal circuit model of a converter. The volatge gain( vo/vin) I am finding is not as it should be. I think I am doing something wrong in ...
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2answers
27 views

Using a Relay with SMPS as load leads to contact welding after keeping energized for sometime

I am using a relay SRD-5VDC-SL-C(generic module made for diy projects) to control AC current going to my SMPS(120-300v AC to 12V, 2A DC) driving my LED strip. The relay is controlled by a Lolin ...
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1answer
49 views

SMPS Current Sense Resistor Selection

I am looking into using an SPV1040 boost converter to charge a battery from a solar cell. The chip includes inputs for a current sense resistor, which are described in one of ST's applications notes ...
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2answers
86 views

What is the correct way to control voltage on a mosfet

First Schematic with N-Mosfet simulate this circuit – Schematic created using CircuitLab simulate this circuit I have a few question on these design. First designed has been built on a bread ...
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1answer
40 views

How does splitting power cables work in ATX PSU?

I came across this Gamdias 650G PSU. Its CPU EPS has 8 pins at the PSU end but it’s split as 2 x (4 + 4) at the motherboard end. There are certain boards that now come with 8 + 4 EPS power sockets ...
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0answers
30 views

RT8239B SMPS not enabling

I have a laptop Asus X551CA that i am repairing and am not understanding why the smps is not enabling the LDO's. The type is the B type RT8239B the schematic that the Asus uses is on page 4. I have ...
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0answers
52 views

Switching regulator layout advice - MAX15062A

I am about to place an order for my PCB to be fabricated. The switching regulator is the thing that is making me most nervous about not working correctly. It is only a low power regulator with 3.3V, ...
0
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1answer
52 views

How does flux change polarity in full bridge SMPS transformer?

Take a full bridge switching circuit connected to the primary of a transformer. Assume: No load on secondary. Voltage into full bridge is DC. Duty cycle of switching is 50%. At t = 0, full bridge ...
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0answers
25 views

Testing a PWM Switching Regulator with a DMM (STR-W6253)

I am interested in testing the PWM Switching regulator with a digital multimeter. The circuit that I want to test is a part of an LCD TV that got hit by lighting and stopped working, and I have ...
0
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1answer
36 views

what is the max voltage that a cordless phone may handle above its original rate? [closed]

I am familiar with the fact that,today,most of the cordless phones have smps adaptors,which supplies a constant voltage to the base unit(opposed to the unregulated linear adaptors,which their rated ...
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2answers
49 views

Design an AC/DC Nonisolated Switching Mode Power Supply

I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because ...
0
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1answer
36 views

SMPS Over Voltage Protection

I have some related questions here and I hope I get better understanding thru this forum. ATX SMPS has Over Voltage Protection. Does it mean that it will shut itself down in over voltage situation or ...
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1answer
125 views

I need help to identify this old SMD device

I'm working on a circuit and I can't find information on this component (see picture). This hybrid circuit is part of an old industrial PSU. It is a PFC circuit based on UC3854 but I don't know if the ...
0
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1answer
32 views

Forward converter input current

I'm trying to calculate the Forward converter's efficiency. For that I calculate the losses, trying to include as much factors as possible. To calculate the loss on the input capacitor's ESR, I have ...
0
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1answer
44 views

Burst mode in synchronous buck converter with current mode control?

I read this previous question: The meaning of Burst Mode It says burst mode happens when the resistance of the load is light and the system stops switching the MOSFETs. However, I just cannot ...
4
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1answer
151 views

How to cure SMPS output to get upset by a switching device

I have been having ringing spike issues at the output of SMPS power supplies. I don't know what is this phenomenon is about but it is definitely related to switching devices on the same electrical ...
4
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1answer
99 views

How to reduce noise in SMPS (Switching mode power supply) circuit

I am just using a reference design of SMPS (from Microchip) to boost input voltage from 12V to 90V as the image below: It's working normally but the problem is the noise at the output of 90V. I ...