Rectifier 120v to 12v

The Wikipedia page titled, "Rectifier", does a pretty good job of explaining the full-wave bridge rectifier circuit. Regarding the question of which, er, what rating, for the diodes, pretty much all you have to do is satisfy 2 conditions:. Note that the peak value of an AC waveform is greater than the RMS value by a factor of square-root-of So, for example, the peak voltage of 12VAC, is actually Although, tt turns out it is very easy to find diodes with PIV rating higher than that. So for a rectifier circuit that does not have to deliver much current e.

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If the rectifier circuit must deliver larger current than this, then the diodes start getting more expensive, and physically larger, and also you have start worrying about power, as heat, approximately 0. By the way, they also make bridge rectifiers as a package. They are typically square shaped for the 1 phase kind with four terminals one on each cornerwith a hole through the center so you can bolt it to a heat sink.

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Also the cost of a such a packaged bridge rectifier is usually the same, or less, than the cost of 4 diodes. They're even cheaper if can pull one out of some broken piece of junk already in your parts collection. Answer 4 years ago. I do the same thing actually. Since 1. Actually the math is kind of reminiscent of calculating tips for waiters, waitresses, waitpersons? Although for explaining it to somebody for the first time, I thought I'd be pedantic, and use the same formula Wikipedia does.

I dunno. Seems like I'm always linking to some Wikipedia article. Sometimes two or three of 'em in one post. I don't know if anyone actually follows those links and reads the article, but in the event that happens, I thought it would be reassuring to the reader to see me, and Wikipedia, and almost everyone else, using the same formula.

Wikipedia is good for something as straight forward as a formula and I do follow and use the links my self on occasion. But some of their articles have been messed with by hackers or have poor references. The downside of being a member and editing. That depends on your application.

Powering something small, 4 1N's would probably be fine. What's most important is that you don't exceed the average current rating of the diode, or bad things will happen. The diodes and presumably the transformer should be sized appropriately for the load. Because 2 diodes will be forward-biased in series with a full bridge during either half of the AC cycle, you will always have 2 'diode' drops.

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Each individual diode is only used half the cycle, so the average current rating is approximately doubled for the bridge rectifier as a whole each half of the bridge rectifier does half the work.

Especially with smaller diodes, make sure that you don't exceed the diode's peak surge current rating when it is charging a filter capacitor. Otherwise you are putting a lot of stress on the diodes each time the power supply is turned on. Those are pretty compact, that specific one can handle an average current of up to 25A plenty for some of the most demanding applications. I don't know why you would use a volt diode for a 12 volt circuit, I would use a 1N in a circuit less than 50 volts.Despite their size, they're designed to power motors, solenoid valves, and other devices that require large start-up current.

Made of durable components for a long life in demanding conditions, these power supplies convert AC voltage to power DC motors and other devices that require high start-up current. Convert AC voltage to power DC motors, solenoid valves, charging capacitors, and other devices that require large start-up current.

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Less than 3" deep, mount these power supplies to a DIN rail in shallow enclosures and control panels, such as those used in building automation systems. Monitor voltage, current, remaining life, and other maintenance data from your PC, PLC, or by glancing at the digital display.

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There's no need to inspect these power supplies with multimeters or other test equipment. Send both electrical and data signals to equipment on AS-interface networks. Power multiple devices with different voltages at the same time— these power supplies take AC voltage and convert it into several DC voltages at once.

Convert AC voltage to DC voltage without plugging a bulky adapter into your outlet. These power supplies come mounted onto a cover that fits a standard junction box, also known as an outlet box. To power electronics ranging from simple prototypes to complex industrial automation and process control equipment, these general purpose power supplies convert AC to DC voltage. Completely sealed and protected from dust and water, these power supplies don't need a separate electrical panel or enclosure.

Instead, mount them directly to machine tools, process control equipment, conveyors, and other equipment found in harsh industrial areas. Convert AC voltage to clean, predictable DC voltage for powering highly sensitive devices, such as measuring, testing, and audio equipment. Flip the switch to reverse the magnetic current and release your electromagnet's hold.

Suitable for high-speed automated applications, these transformers reverse the magnetic current and release your electromagnet's hold faster than other electromagnet transformers.

Plug these adapter cords into a standard outlet and they change AC voltage to DC voltage, so you can power many electronic devices. Pair these adapters with power cords that have the plug style and cord length you need to run DC-powered devices from your outlet. To run DC-powered lab and medical equipment from your outlet, add a power cord with the plug style and length you need. Use these adapter cords to run DC-powered devices from an outlet in a variety of different countries. Change AC voltage to DC voltage and bring power to electronic devices while protecting them from harmful electromagnetic interference EMI.

Change AC voltage to DC voltage to power extremely sensitive audio, measuring, and testing devices while keeping electronic interference— often called output or ripple noise— from passing on to the device.

Convert AC voltage into the DC voltages needed to test, design, and prototype a wide variety of electrical circuits and equipment. Use your computer to remotely control these power supplies that convert AC voltage to DC voltage for powering electronics from simple prototypes to advanced testing equipment.

Power multiple components in your desktop computer with these power supplies— they convert the AC voltage from a power outlet to DC voltage. Contact Us Order. Log in.

12v LED on 120v Power

Create login. Choose a Category. Output Voltage. Maximum Input Voltage. Output Current. Electrical Phase. Mounting Location. Input Wire Connection Type. Input Frequency.When you need to run a regular household electrical type device in an area where no regular grid power is available, this calculator will help you figure out what size batteries and power inverter you need! This calculator is designed to assist you with power usage amounts, when converting from one power form to another using a DC to AC inverter.

Just enter power numbers in the fields below, and we will do the calculations for you, including typical inefficiencies and all that other techie type stuff you may not care to calculate. If you are not sure of your numbers, have a look at the walkthrough illustrations below when entering numbers. If you want to size your inverter battery pack, then you first need to figure out the DC amperage you will be pulling out of your battery pack through the inverter.

This calculator can assist you in figuring out the DC amp draw through an Inverter, so you can accurately size your inverter battery pack. Full Name Should contain only letters, numbers, and '. Email Address - will not be published Email address should be formatted user domain.

Subscribe to comments with RSS. Emmanuel I have a 12v car battery and I also have v electric motor. So can the 12v battery run the electric motor??? Depending if the motor is an AC or DC motor you would need either inverter or converter to run the motor off of a battery. I have a car audio amplifier and subwoofer set up that i can no longer use in my vehicle. It is a watt amp when connected to a 1 ohm load.

The subs play real low, like down to 25hz. Which makes me want to bring this inside for movies. Stupid idea, I know. However, I am still interested in repurposing this setup.

The question I am asking is beyond my comprehension, so please be patient. If the amp pulls around amps DC to create watts at 1 ohm. How does that equate to AC? The standard breaker in my house is 15 amp's, with a few at Is there a power invertor that can plug into a volt outlet and provide the power needed for the amp? Would it require a volt? Would that still not be enough power?On the surface, these rectifiers are fairly simple devices and I am sure that you have some level of understanding of how they work.

The maximum input power is 20W. Figure 1. Measuring the input voltage and the output voltage would give the following results:.

If we were just users of the wall adapter, that would be just about all that we need to know. Then connected to the secondary of the transformer is a full bridge diode rectifier, followed by a filtering capacitor, and finally a center positive output jack.

In the sections that follow the purpose of each of these components will be analyzed to show how the AC input voltage ultimately gets converted into a 12V DC voltage. Figure 5 shows the same adaptor seen from the side.

rectifier 120v to 12v

The blue wires on the right are the inputs from the two-prong wall connection and they connect directly to the primary of the transformer. The output from the secondary can be seen at the lower left of the transformer as two small copper wires. The purpose of the transformer is to step the AC voltage down from the V RMS from the wall outlet to a voltage that is closer to the required DC voltage. If you ignore all of the non-ideal properties of transformers, they are very simple devices.

The general idea is that there are two usually large coils of wire that are electrically isolated, but magnetically coupled together. The input side of the transformer is called the primary and the output side is called the secondary. Alternating current passes through the primary coil which creates an alternating magnetic flux in the transformer core. This alternating magnetic flux in turn induces a voltage in the coils of the secondary.

The ratio of the number of loops in the primary coil to the number of loops in the secondary coil is equal to the ratio of the input AC voltage to the output AC voltage.

In equation form this relationship is:. Figure 6 shows a cartoon representation of the coupling of the primary winding to the secondary winding through the transformer core. The geometry of the core of the AC adaptor from Figure 5 is different from this diagram's geometry, but the principle is the same. Figure 6. Transformer Diagram.

rectifier 120v to 12v

Transformers do not generate energy or ideally use any energy; they are entirely passive devices that simply step-up or step-down the AC voltage. Since they are not generating or producing power, the power in to the transformer must equal the power out.

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Using the fact that power into the primary P equals the power out of the secondary Swe can derive an equation relating current in the primary to current in the secondary:. The relationship between the primary and secondary voltage of this particular adaptor can be seen in Figure 7.

Figure 7. The voltage ratio is about 7.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. I have LED lights that will draw up to watts. So would any bridge rectifier rated over 12V and over 17A work? I bought the following thinking it would be more than enough but it started smoking when I connected it.

I did check that it was connected to the proper terminals per specs, and verified that I was getting 12VAC from the power supply.

rectifier 120v to 12v

Did you try reading the datasheet for the device? Thereyou'll see the forward voltage drop of diodes inside of the rectifier. In general, you need to find and read the datasheet for every electrical component you're using. Drop times current is sort of, more or less power that needs to be dissipated. We also have maximum operating temperature.

So armed with that information, a cooling system needs to be devised to work with the rectifier. So if we look at real numbers, we have maximum drop of 1,2 V per element. At one time, we have two diodes conducting, so that's 2. Next, we have operating temperature of the semiconductor junction. So what we have next is the procedure how to get the temperature increase above ambient for the unit.

So let's look first at the thermal resistance between the junction and the case. It's 1. One kelvin and one degree Celsius are of the same magnitude, so we can get the temperature increase this way.

So at 40 W, our junction will be at temperature 60 K higher than the temperature of the case. Looking back at operating temperatures, this gives us maximum case temperature of 90 degrees Celsius. Now we need to estimate the thermal resistance of the heatsink we need to select for our use. Let's say that our ambient temperature is 25 C. So now we do the backward calculation of what we've had in the previous step.Answer 4 years ago.

You didn't exactly steal words, but you are just repeating the answer he showed with a image. Let's say that I was a plagiarizer, as he wrote. If I was the one that asked the question, I wouldn't understand what those weird names and numbers the schematic.

That is why my comment is simpler. Even if I would have copy pasted some of the words that are in his comment which I didn't doI think it could still be legitimate. I think not. According to the Merriam-Webster Online Dictionary, to "plagiarize " means. I don't think you would actively plagiarize, but to paraphrase Steve "not knowing is no excuse".

Also, I only said " it looks like it ". Say you do not understand how to read circuit schematics yet you have published Which Components Are Worth Salvaging [ motors and a schematic symbol of a DC motor ][resistors][ potentiometers with schematic symbol ][ batteries with schematic symbol ][ LEDs ][ diodes ][ bridge rectifiers ][ etc ], How you Organize your Electrolytic Capacitors. My point is, I agree, you did not intend to copy But also you shouldn't be offering technical advice, to people looking for an answer and are unaware that, as you say, " I don't know how to read schematics ".

I agree. I know all of the most commonly used components, but not all of their symbols for making a schematic. I searched their symbol on google images, I didn't make that myself If you look at my other reply 3 days ago, placed right over your answeryou can see that I also suggested a standard 12V power supply, after I wrote the first comment.

I think we can finish this as a comment that I wrote, that accidentally had an answer similar to yours. By the way, when I ask a question, I prefer getting several similar answers like this oneso I can understand the best. Its not so hard to read schematics you know most of the components and my drawing has labeled them for you.

Yes, I know. I just haven't had the time to get more into electronics. I'm mostly into making all sorts of flashlights and lighting with really cheap 10W LED's from eBay And those also need current limiting resistors or whatever they are.

The schematic also includes a capacitor after the bridge which is a good idea with a bridge. That was also the reason for the illustrative eBay post, which was originally your good solution comment. Follow Asked by devlp in Circuits. I'm using a 12 VDC power antenna to run an automatic coop door opener. Tags: chicken coop door.

What is the formula used for AC to DC using a full-bridge rectifier?

Yonatan24 4 years ago. Reply Upvote. You'll also need a transformer. Sure looks like plagiarism to scrabble to the top! Do you ever read other answers?

Yonatan24 iceng Answer 4 years ago. Whose words did I steal exactly? Sorry I don't exactly understand your comment, and yes, I usually read other repliesLatest Projects Education. General Electronics Chat reducing 14v dc to constant 12vdc. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Pistolpete Start date Oct 14, Search Forums New Posts. Thread Starter Pistolpete Joined Oct 14, 1. I put a new kawasaki engine on a piece of equipment that has many electrical relays to run electric hydraulic controllers.

Kawasaki doesn't have a differant regulator for this engine. I am told the relays will fail if i don't get them steady 12v current. The inline fuse is 15amp to the control panel. Is there a inline current regulator that can reduce the voltage from 14vdc to 12vdc with 15 amp draw.

As you can probably tell by my lingo i am not very knowledgeable about electronics. Any suggestions would be very helpful in correcting this problem. Thanks Pete. Scroll to continue with content. As for relays, and 2V reduction, 3x power silicon diodes in series can be used.

Pistolpete said:. This is nearly half of rated 12V. Depends if the relays are enclosed or if there is airflow. If relays are powered for long time, or if there is even overvoltage, they will get hot. You should run a long-time test. Eventually the relays can tolerate 14V. Relays also can latch after some time, depending on the load current, especially so if they are used to start motors.

Overvoltage could accelerate this further. Latching means, the magnetic anchor will remain stuck even after coil current is switched off. In some cases it is sufficient just to tap the relay with a screwdriver etc.

From my experience 12V or 14V should not result in a large difference, but I don't know the type or size of these relays. And power diodes aren't expensive. They may require cooling as well. Many TO diodes are actually schottky-type, their drop voltage depends on the load current.

If the current is low, it might be only. Are you worried about 12V on the coil part of the relay, or the contact portion? If it's just the coil part, why not just use a basic voltage regulator? I doubt very much the relays would die if hit with 14V.


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