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Another Power Supply Question


This permits continuous transition from constant current to constant voltage modes in response to the load change. Circuit elements that must be functioning properly 1. 2. The output voltage is supposed to be 15 volts DC, but instead it is actually outputting less than 8 volts DC: The technician measures approximately 18 volts AC (RMS) across the The filter capacitors can also be smaller at these higher frequencies and chokes are more effective. http://magicnewspaper.com/power-supply/power-supply-and-fan-question.html

Notes: These filters are very common in switch-mode power supplies, but they are not out of place in linear (“brute-force”) power supply circuits such as this one. Reveal answer Hide answer Challenge question: does the input current waveform shown here contain even-numbered harmonics (i.e. 120 Hz, 240 Hz, 360 Hz)? Anyway, the CPU most likely stays ~100W if it's an Athlon 64 then <90W , the 6600GT isn't very power hungry either, certainly <75W, probably less than 50W, so the other The PP1's output is not regulated, or the power regulation may be faulty. 2.

Can I Use A Power Supply With Higher Amps

The original monitor PSU (PA-1650-68) was fixed at 19V and 3.32A. It could simply blow a fuse. In this example, I show the waveforms for output voltage and input current for an unloaded AC-DC power supply with a step-down transformer, full-wave rectifier, and capacitive filter circuit (the unfiltered In the above design, you can see that the transistor has Vin - Vout across it.

Reveal answer Hide answer The transformer has an open winding. Notes: One factor not mentioned in the answer is circuit operating voltage. Pretty much anything you can buy as consumer electronics will be a regulated power supply. Types Of Power Supply In Electronics Notes: Many years ago, when I was first learning about power supplies, I tried to power an automotive radio with voltage from a battery charger.

Some also have meters to let you monitor the current. Current Rating Current is a bit different. Another advantage with SMPS is that the switching can be modulated in various ways, depending on the load conditions. http://electronics.stackexchange.com/questions/34745/choosing-power-supply-how-to-get-the-voltage-and-current-ratings Tracking accuracy Some power supplies with two or more outputs may have a tracking feature.

Multi-range Supply Most conventional power supplies operate with fixed voltage and current ratings, e.g. 30V / 3A. Different Types Of Power Supply Note: sometimes ripple and noise is specified as PARD, which is an acronym for "periodic and random deviations". Calculate the unloaded DC output voltage for this supply (assume 0.7 volts drop across each diode). The maximum ripple might not be at maximum output current. share|improve this answer edited Jul 27 '14 at 1:50 Ricardo 3,966103057 answered Jun 28 '12 at 21:54 Olin Lathrop 210k23242554

Power Supply Amperage Too Low

This is rarely specified and would probably have to be measured. This is one reason they are universally seen in personal computers. Can I Use A Power Supply With Higher Amps Question 28 A simple AC-DC power supply circuit outputs about 6.1 volts DC without a filter capacitor connected, and about 9.3 volts DC with a filter capacitor connected: Explain why this Can I Use A 12v Power Supply On A 9v When you think about it, this is excellent behavior -- a change of up to 1 part in 10,000 (it's done with negative feedback control circuits).

Discuss these issues with your students in the same Socratic manner you would normally discuss the worksheet questions, rather than simply telling them what they should and should not do. my site If the wire is insulated, special insulation piercing probes are available, such as CalTest Electronics CT3044, or the Pomona 5913. Tristan Cornell C-BISCUIT: Robot System Architecture The C-BISCUIT saga continues as we combine the various system components into a demo bot. Seriously though.Our rules have been updated and given their own forum. Power Supply Amperage Too High

It's a Mean Well RD-50B dual output [email protected] and [email protected]://www.onlinecomponents.com/mean-well-rd50b.html?p=11952931 I added a fuse and current meter to monitor what's happening.Here's a picScott 2 of 2 people found this helpful Like Follow-up question: explain in detail how the issue of non-isolation could create a safety hazard if this rectifier circuit were energized by an earth-grounded AC line circuit. The current rating of a supply is what it can deliver, not what it will always force thru the load somehow. my response Ripple can be defined as the portion of unfiltered AC voltage and noise present at the output of a filtered power supply when operated at full load and is typically specified

Be sure to spend plenty of time in class with your students developing efficient and logical diagnostic procedures, as this will assist them greatly in their careers. Power Supply Current Rating Load from dictionary or database if not found Should Beta Minus decay put a limit on the lower mass of a neutrino? Better filter configurations include all forms of LC ripple filters, including the popular “pi” (π) filter.

It's a protective device used on the output of power supplies (usually an SCR) to short the output if the output voltage goes above a set level.

Note that this series operation must be such that the current doesn't exceed that of the power supply with the minimum current rating. The seller is Native Instruments, and it came in official NI packaging. It does, however, help prevent the power supply circuitry from interfering with other equipment energized by the same AC line power, by filtering out unwanted high-frequency noise generated within the power Bench Power Supply Kit I picked up a nice Seasonic S12, but the second 12v line isn't long enough to reach the top of the motherboard because the psu sits at the bottom of the

Once a full-cycle voltage analysis is performed for all circuit components, the necessary diode rating should become obvious. How do I measure ripple and noise? The higher frequencies and switching mean higher levels of electromagnetic interference (EMI), both radiated and conducted. pop over to these guys What value do you suggest?Enrico Like Show 0 Likes(0) Reply Actions Re: Power Supply Question dougw Dec 23, 2016 6:16 PM (in response to balearicdynamics) Some power supplies need a load

The power supply output is regulated with a feedback circuit which adjusts the timing (duty cycle ) with which the MOSFETS are switched on or off. Notes: Troubleshooting scenarios are always good for stimulating class discussion. What's to blame? This question and answer was essentially solicited in the meta post meta.electronics.stackexchange.com/a/1268/4512 –Olin Lathrop Jul 7 '12 at 20:30 | show 2 more comments 4 Answers 4 active oldest votes up

But most of us plan for our students to do something in the real world with the education we give them. Remind them that rote memorization is a very poor form of learning! Another reason for following this method of practice is to teach students scientific method: the process of testing a hypothesis (in this case, mathematical predictions) by performing a real experiment. It still powers on via USB, but I can unplug and plug the power adapter in while running it on USB and there is zero difference in headphone cue volume or

In this example, the maximum output power of 90 W can only be realized when the supply operates at 30 V/ 3 A. Circuit elements that must be functioning properly 1. 2.