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Design and implementation of safe and efficient AC voltage to DC voltage supplies. Typically Mains to some lower DC voltage.

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I've had an idea to develop a flyback power supply for LEDs, MCU and sensors. LEDs will be dimmable from the MCU, either with PWM or manipulation of feedback path with an OpAmp. I've stumbled upon two ...
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Impulse buying. While I don't expect it to pass the safety best practices nor the cleanest 12V, I have to be sure what I bought is not going to burn down the house. :) Still learning Elec, but as far ...
metric's user avatar
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I have created an AC-DC converter by using only linear elements on Falstad. My way of thinking is like this: Start with a (co)sine wave as input. We know that the (co)sine wave has a transfer function ...
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Hi what I am proposing this enters the area of fantasy I believe but I will give it a shot..Suppose you have a circuit with a switch and pull down resistor connected to a 5V source.When you close the ...
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I have an RO60 KV115 Lite alternator without a hall model. Using this alternator, I want to design a three-phase full-wave rectifier circuit using a shotkey at 8000 rpm. What will the DC output ...
Berat Göktuğ Şalcı's user avatar
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Ok peeps, this is not a discussion of the safety or advantages/disadvantages of Transformerless Power Supplies (TPS) as there are many on this QA already. Rather for those who have already decided to ...
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I'm trying to simulate this AC-DC rectifier circuit for power supply and expect to see a ~320V DC output, but the simulation shows a short circuit (0V output and ~80A input current). I must be missing ...
Eureka's user avatar
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I have been reading about the Wikipedia article on negative resistance and in particular, I'm interested in this circuit (also linked at Wikipedia): I was wondering if we could convert this into DC ...
Root Groves's user avatar
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I have a t.c. electronic M3000 with SMPS which has a very bad reputation. For my particular case it has a very weird problem: when device is powered-up (BROWN is ~3.3V, so Q4 is saturated), it works ...
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The results I obtain from multimeter after the bridge rectifier is 5.18 V. But based on the calculation: Vpeak = 10 - 0.7 - 0.7 = 8.6 V Vavg = 2 / π Vpeak = 2(8.6) / π = 5.47 V I should obtain about 5....
curious's user avatar
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L1 AND N1 ARE SCREW TERMINAL C1 = 560nF X2 310 VAC CAPACITOR R1 = BLEEDER RESISTOR OF 470 kOHM R2 AND R3= 100OHM 200V 0.5W RESISTOR BR1 = 35A 1.1V@400mA 1A 1kV MBS Bridge Rectifiers (MAX VOLTAGE 1000V)...
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Am I missing something when it comes to AC to DC converters. From what I understand, it's a fuse to a transformer, then to a rectifier, then to a bank of caps, possibly with a choke inductor and then ...
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I am attempting to repair a dehumidifier which works on 110VAC (UK based 'work site' type equipment). Apologies in advance for potentially beginner type questions! The device was originally dead and ...
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I am trying to increase the measurement voltage of a 1000A:0.075V current shunt using an INA129 Instrumentation Amplifier to be measureable by an MCC118 Daqhat for a Raspberry Pi. I am seeing a base ...
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I am trying to design some circuitry to measure mains voltage (120 VAC 60 Hz) using an MCP3204 ADC connected to an ESP32. My goal is to measure the AC voltage with a precision of about ±1 VRMS. So ...
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I am conducting Electromagnetic Compatibility (EMC) testing, specifically Telecom conducted emissions, for a floating device. The Equipment Under Test is powered by an AC-DC power supply. My ...
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I'm an FPGA engineer currently on an analog board design. I have two AC/DC converters taking power from an entry module interfaced with a 220 V.ac and one generates +-12V while the other 5V. Now, I ...
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I'm working on analyzing this crystal oscillator circuit with a temperature control section, and I'm looking for some in-depth help to understand each part of it. Here’s the circuit diagram: I'm ...
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Whenever I use a 5-wire cable with DALI, I use a circuit breaker with two additional NO contacts through which the DALI line goes through, so that if there are any problems on the cable side, the DALI ...
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I have seen some vendors selling 24 VAC transformers to power up swimming pool lights that are submerged in the water. These lights also work with DC but I think transformers are being considered ...
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I am using the LRS350 AC-DC power module. The specs are as shown below - The rated power is 350 W and the max current allowed is approx 14.6 A. Assuming an efficiency of 88 %, the input power should ...
Board-Man's user avatar
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You know those basic AC/DC adapter that come with every small appliance? What's the real map of the current technology/capacity? Averages, ballparks, IME allowed. For example, I have plenty of 110V AC ...
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I'm building a lab bench power supply and I want to power it from mains voltage. My plan is to buy this transformer to go from 120VAC to 12VAC, then send the 12VAC through a rectifier, and then ...
MXVG's user avatar
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I uploaded a picture, is there a better way for me to share the circuit? The addressable LEDs use up to 100 mA at 5 V, that is why I am using three 5 V power supplies in parallel, each offering 600 mA....
Cancun Manny's user avatar
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I'm new to designing flyback converters. I noticed resistors connecting the primary and auxillary coils. Can somebody explain the usage of these resistors for me. The IC in this schematic is a CR1510. ...
Minh Trinh's user avatar
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I've designed an AC/DC power converter PCB, with input, and output voltage sensing, but I have problem connecting it to microcontroller board, i'm using F28379D launchpad as the microcontroller. I ...
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6 answers
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Edit: I have added the updated PCB design at the bottom over this post (for anyone curious about the progress) And a big thanks to everyone who commented, it really helped me out a lot! Original ...
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I need your opinion about the correctness of my circuit. As is shown in the drawing schematic, the circuit is supplied by 220 VAC which will be converted to 12 VDC. This output is used to supply the ...
nad66's user avatar
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So this is my first time using LTspice and I need to convert my (AC) Vin 11.5V to DC and then boost DC voltage to Vout 22.5V. I have a few givens and some I needed to calculate. I am struggling to ...
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I am designing a powered USB HUB (UFP) which can provide power to the host through USB PD. This means I need a PD controller which supports DR_Swap and it seems that STUSB4700/STUSB4710 cannot be used ...
osy's user avatar
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5 answers
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I have a laptop adapter that takes in 120V AC and converts it to 20V DC. The adapter is rated for 230W (11.5A 20V.) Knowing conservation of energy and such, this means that the adapter takes in 120V ...
zapshe's user avatar
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I'm trying to calculate the input power draw of an ACDC power supply that we are using in a control chassis and am confused by what to me looks like conflicting information in the datasheet. The power ...
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I am designing a flyback converter and I am being told to make the ground net connections as shown in the image below. I think this is colossally dumb because it eliminates PRI and SEC isolation. I ...
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I have a problem with capacitive sensor. I have created PCB with 2 capacitive sensors. Everything is working fine and ESP32 s2 mini reading values as I expect while I powering up esp32 with type-c 5v, ...
Ignas Navickas's user avatar
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1 answer
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Many AC-DC power supplies (say, 220VAC to 24VDC) have huge inrush current values. For example, a device might have an inrush current of 80A@230VAC. This raises the question of how to handle the ...
Dmitri Nesteruk's user avatar
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2 answers
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I have a battery (8 cells in series, NiMH AA cells (1.2 V to 1.3 V), 1300 mAh per cell). Cells used- https://www.amazon.in/Rechargeable-NiMH-2300-Peak-Power/dp/B01MF8HUKO https://www.amazon.in/...
funtastic rdj's user avatar
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Of course, 3-phase alternating current can be converted into a rippling direct current with a 3-phase bridge rectifier. This design only draws current from the two phases with the most voltage ...
Electric-Gecko's user avatar
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2 answers
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I'm attempting to build a near-infrared (850 nm) lamp using high-power LEDs and am struggling to design a suitable way to power them directly from the AC power plug (220V). I have 10 high-power LEDs ...
vtot's user avatar
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5 votes
2 answers
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I want to create an inverter LED light source. I would be using 2 COB LED lights rated at 4 volt DC, 8 watt. My idea is that when the phase is connected, I want the light to glow and at the same time ...
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1 answer
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I am using this H-Bridge Configuration to make active PWM rectification to control the output average Voltage by controlling the Modulation Index. Here is the circuit diagram and the pulses of each ...
Saif 's user avatar
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2 answers
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I am studying about power supplies and I need some help with the following. I have a power supply with a 12 V DC output to power the lower power controller electronics. This power supply has two ...
power_electronics_engineer's user avatar
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I have an active front end unit that is connected to a 3 phase system. It's controlled via software and I can set a value for the DC bus voltage. When the input is the AC 3-phase, how does this ...
Thomas C.'s user avatar
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3 answers
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I'm working on a constant current power supply and as a first step designed the following rectifier with a filter. I know the bottom rectifier is inactive, but with couple of switches the circuit ...
beardeadclown's user avatar
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Residential situation with mounted 2-ton hydraulic 12 V crane. Have 120/240 available, need to create 12 V 300 A available power for intermittent use, boat launch. Average power used 150 A 12 V DC, ...
Brad R's user avatar
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1 vote
0 answers
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Is it safe to power up a AC-DC power supply while it is connected to a load? Specifically what I'm trying to do is replace an AC espresso water pump with a 24V/2A Brushed DC water pump. Additionally a ...
Tate Mazer's user avatar
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2 answers
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I am working on a circuit of an old 90's Terminal Applicator and noticed it has AC power coming in, then stepped down with a transformer, and then going to a pair of full bridge rectifiers. One goes ...
Erik Vincent's user avatar
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I am building a flyback converter to convert 230V AC to 20V DC using a microcontroller. So far my simple converter works, but I have to power the MOSFET driver such as HCPL-3101 from a secondary DC ...
Amin Gholizad's user avatar
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I wonder about how exactly modern, but mundane ACDC power supplies (your phone power supply) are designed. Maybe my misunderstanding comes from one of the following assumptions: Modern AC-DCs ...
Niclas's user avatar
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I am trying to use the power supply: CQB50W12-72S12 with AC power without degrading the performance of its recommended filter and surge components. 120VAC peak voltage is 169V and I am worried that ...
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2 votes
3 answers
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I have a project that has a PCB housed in a metal enclosure. The PCB is powered by a USB-C connector. Power input is 20 V DC @ 4 A max. Power is sourced from an isolated AC/DC wall wart adapter. The ...
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