since the voltage is being stepped down by a factor of 6:1, an ideal converter could give you the sign's spec'd 18V/2A from only 0.33A input...the difference in input amperages is just really a matter of efficiency. NOT all adaptors have that same "polarity" on their plug, so it's important to notice where the DC + and - flows are on both your supply & your device, so you can make sure you're not hooking something up backwards, which can cause immediate & major damage to devices without reverse polarity protection. Any device will only draw as much current as it needs, so long as its power source can supply it. Also, for future reference, the symbol after the 2A rating on both adaptors (with the - sign, then the C and dot, then the + sign) tells you that the output plug has the DC - on the outside of the plug & the DC + on the inside. There are a few things you can do to avoid voltage drop in some situations. [duplicate]. Is it safe to use a laptop AC adapter with 220V power if the AC cable is not rated for 220V? If you charge up a capacitor with a lower voltage rating than the voltage that the power supply will supply it, you risk the chance of the capacitor exploding and becoming defective and unusable. Can I use this third party charger for my Asus laptop? The amount of voltage drop will vary based on the brand and power consumption of the LED strip lights. It will keep a stable voltage when it has any load. 2. In AC installations, you can simply use an Auto-Transformer to reduce the voltage. Replace blank line with above line content. Spare laptop power adapter input amps differ from OEM. Also, could you recommend a place where I could buy a 18v adapter? With a failed diode the mains input voltage is only half-wave rectified, so when any appreciable current is drawn from the supply the voltage on the input reservoir capacitor drops way below where it should be. This laptop adapter supplies an output voltage of 19 V and a maximum output current of 3.42 A, well above your original adapter's 2A maximum. Podcast 294: Cleaning up build systems and gathering computer history, Using a higher current charger on a laptop which requires a lower current, Laptop power supply 16V 4.5VA instead of 20V 3.25VA. If you have too high a current, the system simply won't draw as much power as the supply can provide. You might save a bit more by dimming the LCD. Mine was 400V and I got it from another CFL circuit. Voltage too low – If the voltage on an adapter is lower than the device, but the current is the same, then the device may work, albeit erratically. How late in the book-editing process can you change a characters name? In addition to simply consuming less power, RAM that runs at a lower voltage is also typically more stable since less voltage typically means less heat. While at that time, the circuit might function properly. I am currently risking using an IBM Thinkpad adaptor (my old laptop) after checking the specification. That's what I figured. If the power source hasn't the ability to supply the current required, the power supply output Voltage will drop, the power supply may well overheat and burn out. Any device will only draw as much current as it needs, so long as its power source can supply it. If there is 14 gauge wire, that means it can handle 15 amps. I.e. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Now, for usage, the LED sign very likely (but not guaranteed) has an internal voltage regulator, in which case, the small (about 6%) overvoltage would be handled there. 120 and 240 volts (along with neutral and ground) is then distributed to outlet boxes (switch, receptacle, light fixture, etc) throughout the dwelling. If for some reason your replacement power supply has a lower-than-required maximum amperage rating, you may end up with a burnt out or overheating … Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. That too will cause the DC Voltage rails to sink lower than what is normal and cause amplifier clipping. Power enters the dwelling’s main electrical panel from a power company transformer as two 120 volt lines with phases that are 180 degrees apart. http://www.rason.org/Projects/discreg/discreg.htm. 12V LED strips will lose voltage faster than 24V strip lights, so if you are looking it make longer runs over 40 feet, we would recommend going with 24V strips. Power adapters are known by many names: AC adaptor, AC/DC adaptor, AC/DC converter, or, a PSU or power supply unit. Hi all, I've read that you can use a power supply with a device if it has the same voltage rating but a higher current output than required. Adjustable Power Supply Circuit. If you have a higher voltage direct current source and require a lower voltage, you will want to use a DC to DC converter W. If you have a main voltage alternating current source that you would like to use at a lower voltage, you will want to use a transformer W. You can connect the Low voltage power supply with: Car socket 12 volt But this adapter on eBay says 0.2A input, 2A output. How to prevent guerrilla warfare from existing. There is a weird symbol between the 19V and the 3.42A, but I have no idea what it means. Would this AC adapter work with this external HDD enclosure? DC power supplies use AC mains electricity as an energy source. However, the laptop adapter's voltage is a full volt above the specified 18 V; this will cause more current to flow into your device, since the voltage has been increased. But it still has the same characteristics as a fixed regulated power supply. Windows 10 - Which services and Windows features and so on are unnecesary and can be safely disabled? [duplicate]. It is often used in recessed, track, pendant, landscape, and display lighting applications, among some others. And does it depend on the device? This also happens if the current demand on the power supply exceeds what is available. However, a consistent supply of excessive power can damage the circuit. Series regulator – when a series regulator power element shorts, the output very quickly rises above the rated voltage of the power supply. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. If the voltage is too low, you'll get either nothing, or odd / failure behavior when the power draw on the system gets high. The CFL electronics needs to sense the filament and you can use a capacitor as a substitute. :). Wire the breadboard so that the right side of the board receives the 5V output from the regulator, but the left side gets 9-12V directly from your DC power supply. Why is this ok? A power supply takes the AC from the wall outlet, converts it to unregulated DC, and reduces the voltage using an input power transformer, typically stepping it down to the voltage required by the load. The defunct Toshiba adapter is rated 19 V and 3.95 A. It should be noted that when this circuit is constructed the voltage on the meter will be about one volt low. 2020 Stack Exchange, Inc. user contributions under cc by-sa, You should try to determine what is inside the device. If the voltage is too high, you'll risk damaging the equipment you are powering. NOTE: The resistor will not stop the light from "seeing" move than the expected 18v supply, but it will limit the voltage/current to the sign down to 18V/2A at the maximum-power point. The electric utility slightly decreases the amount of voltage being fed into the system to compensate for the high demand. While higher voltage in a drill provides more torque, it also adds weight to the base of the tool. While troubleshooting, be very careful, you are dealing with very high voltages and high currents. Could you explain why the input of the adapter isn't relevant? Under 1A. In the event of a fault, it tells you how much current can flow into the device before some fuse within it blows or how many of these adapters you can connect to a wall outlet without blowing the socket's fuse. THis capacitor will be shunted by a 12 volt Zener diode with an adequate power rating to hold the voltage at a maximum of 12 volts. Laptop power supplies, does current matter? https://electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213885#213885, Thanks for the informational answer! That would only be okay if the system was designed with a lot of overhead, but for high-volume devices like PC power supplies that's very unlikely. If you have too low a current, you will either burn out the supply, trip a breaker or fuse in the supply, or the equipment will not work or fail unpredictably at high load. The max input current is a sort of safety rating. amp max output is 12 volts. These limitations occur when the power supply is asked to supply more power, as either available voltage or current, than it can make available. Can i use a universal laptop charger for +10.8v 4400mah, 47wh. @AO practically every adapter is designed to run off mains (house power), and the nature of "switching power supplies" makes it easy for them to support a wide range of input voltages with little impact on performance. Low voltage outdoor lighting is a popular option for many homeowners seeking to shed a little light on their landscape. My AC adapter (19 V, 3.95 A, 75 W, 3-pin) Part No. If the battery is not charging it should not do any damage. Choosing power supply, how to get the voltage and current ratings? The lower voltage means that the battery isn't charging - but my concern is the higher current - 0.55 more. The power supply is forced by the sense lines to supply the correct voltage to the resistor and the voltage across V+ and V- (in the example given) is set 200mV higher. The voltage SHOULD match (power adapters provide a steady voltage over a range of currents), whereas the current MUST meet or exceed. Simply said it is a power supply that can adjust the output voltage or current. The voltage SHOULD match (power adapters provide a steady voltage over a range of currents), whereas the current MUST meet or exceed. Then am LM309K voltage regulator will provide the stable 5 volts DC. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Does it matter? @AO 1.2A/110V rating is for the wall socket; almost all sockets can provide this current. So don't expose a capacitor to a higher voltage than its voltage rating. Does it matter what the input to the power supply is? I think I may just play it safe and try to buy a new adapter. What type of targets are valid for Scorching Ray? Low voltage lighting systems use a transformer to reduce normal line voltage (120 or 277 volts, usually) to 12 or 24 volts. Can I use a charger with different current than the original? What is a variable power supply? rev 2020.12.10.38158, The best answers are voted up and rise to the top, Super User works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, TL;DR: you need as much or more amperage as your device specifies. If it works, which it does - could I confidently continue to use this until I've sourced a proper replacement? I lost the adapter, and it's surprisingly difficult to buy a new one that matches those specs. This doesn't mean your device will consume 3.42 A when its powered with this adapter; it is only an indication of the maximum current that can be drawn through the adapter by any device that it is connected to, above which the adapter gets damaged. The IBM adapter is rated 16 V and 4.5 A. I've used the IBM for several hours with no ill effect - risky I know! How to Use a Malibu 200-Watt Power Pack with Low-Voltage Landscape Lighting. It only takes a minute to sign up. In addition to this, many applications employ switched-mode internal power supplies, and these can be designed to operate correctly at any voltage from 100V to 240V, and these you can use directly. You absolutely should not replace an electrolytic capacitor with one of lower voltage rating. Since 19V is so close (+6%) to 18v, this should prevent damage to the sign as it is unlikely that any components used would fail at 19v with minimal current, but I would NOT recommend a similar approach id you were using, for example, a 24v source, since the significantly higher voltage could blow capacitors, transistors, diodes, etc in the sign that may not be spec'd to withstand that voltage. Whether this difference is significant enough to destroy your LED sign is a matter of how much tolerance was built into it; the 1-volt increase may merely increase the brightness of the LEDs or burn them, if 19 V is outside the device's range, or have no noticeable effect at all (if the 19 V is being stepped down further within the device). Any idea why tap water goes stale overnight? Low voltage can occur during period of heavy electrical demand (such as during heat waves, when air conditioners are all running). Low voltage RAM, on the other hand, can run at voltages as low as 1.25V. Don’t connect the two red rows on the side of the breadboard to each other, though. Use a high voltage rated capacitor. If the load current changes then the power supply will have to keep adjusting its output voltage … How to Reduce Voltage in Half To reduce voltage in half, we simply form a voltage divider circuit between 2 resistors of equal value (for example, 2 10KΩ) resistors. Why does "CARNÉ DE CONDUCIR" involve meat? That adaptor should work fine for your sign. Their electrical output is described by four things – the voltage they provide, the type of voltage (i.e. In many cases, the higher voltage can cause the battery to provide more power to the laptop’s motherboard and other circuitry. Your sign can only "see" the output of the converter, so that one at 18V/2A rated output should work just fine for you. Residential voltage in the USA and Canada is 120 / 240 volts AC. It can be kind of complicated and confusing if you’re not familiar with how a power supply (and to some degree, electricity itself) works.The short rules boil down to this: Can I use a similar rated charger if it has the same connecter pin size? The input current of the adapter isn't relevant, only an input AC voltage of 100-240 V. Awesome thanks for the answer! To preface; I am aware that there are a lot of questions that are similar to mine. Would the damage be immediate? PA3468E-1AC3 for Toshiba Laptop L40 18Z is now useless. What important tools does a small tailoring outfit need? The supply might be a little less efficient, but no harm is done. When it comes to low voltage RAM, there are three main questions that often come up: But I am finding mixed signals as well as jargon I don't understand; and I was really just hoping somebody could give me a yes/no because I'm really paranoid about plugging it in based off of my reading, I have an LED sign that says that it takes "Class 2, 18VDC, 2A" from a wall adapter with "100-240VAC, 50-60HZ, 1.2A". Can a total programming language be Turing-complete? So we decided to give it a try. Effects of Low Voltage Low voltage is … Through this technique, you can take any voltage and lower it to any level you want. How to write complex time signature that would be confused for compound (triplet) time? If Voltage is Correct, but Current wrong, what's the expected behavior of a laptop receiving its adapter input? Why would the sign include that part? Many home repair jobs don’t require the same amount of power as industrial projects, and some craftsmen may prefer these lightweight designs for everyday tasks. Could this damage the sensitive internal electrics in the longer term - or is it unlikely to make a difference. Output:19V, 3.42A. You need, Can I use a power adapter with more current but lower voltage on another laptop? If the voltage is too high, you'll risk damaging the equipment you are powering. A rectifier is used to convert the transformer output voltage to a varying DC voltage, which in turn is passed through an electronic filter to convert it to an unregulated DC voltage. However, the laptop adapter's voltage is a full volt above the specified 18 V; this will cause more current to flow into your device, since the voltage has been increased. TLDR, don't try using this adapter unless you are willing to risk damaging your device from the extra current. The damage is likely not immediate, the 18V is fed to the charge controller for the laptop motherboard, typically these will have capacitors and switching components with a voltage rating (say 25V caps), I have used higher voltage supplies without issue after verifying that the front facing components are tolerant to the higher voltage. And here is one of the laptop power supply: The weird symbol indicates its a DC output. To come up with this, dividing the sign's required current (2A) by its required voltage (18V) yields an expected load resistance of 9ohms; to get the same 2A current from a 19V source requires a resistance of 9.5ohms; then, accounting for a 1V drop across you 0.5ohm resistor at 2A, we see that the resistor should regularly be dissipating 2W of power, so must make sure its rating is sufficiently above 2W to insure against damage; yielding the 0.5ohm 5-10 watt resistor (cheaply available in a ceramic potted wire-wound type). use a lm7805 for 5 volts, lm7812 for 12 volts, lm7818 for 18 volts, and lm7824 for 24 volts. are some devices clever and able to reduce the current by increasing resistance? If the voltage is too low, you'll get either nothing, or odd / failure behavior when the power draw on the system gets high. It's not getting forced on the device that it's connected to. An, https://electronics.stackexchange.com/questions/213881/is-it-okay-to-use-a-power-supply-that-provides-slightly-more-voltage-and-amperag/213884#213884. For safety reasons, the transformer also separates the output power supply from the mains input. We have also doubled the frequency from 60 Hertz to 120 Hertz. Can I use Lenovo Type-C charger (20V) with Macbook Pro 2019 (20.3V)? Easily Produced Fluids Made Before The Industrial Revolution - Which Ones. Like could I plug it in, see what it looks like? (This is for comparison to the output of the adapter, ignoring the AC input side.). Was there an anomaly during SN8's ascent which later led to the crash? The sign literally asks for a 1.2A input, 2A output from a power supply. Figure 1 shows the circuit. Advice on teaching abstract algebra and logic to high-school students. It may put a strain on the voltage regulator in your laptop and may also put a strain on your battery (which you might consider removing while you're using the mismatched power supply). Can I print in Haskell the type of a polymorphic function as it would become if I passed to it an entity of a concrete type? First off, that symbol on the laptop pwr adaptor simply means that its output is DC current (as opposed to AC mains power). or would it potentially just fry immediately. you can wire the voltage regulators in parallel to handle more current The centre pin polarity is the same, I cannot currently find any references to Wattage output for the IBM adaptor - but the only difference I can find is in current and voltage. Is there a difference between a tie-breaker and a regular vote? Using HP charger on a Dell Inspiron 15R laptop. Dealing with very high voltages and high currents my old laptop ) after checking the specification 's rated consistent of... Charger on a Dell Inspiron 15R laptop Malibu 200-Watt power Pack with Low-Voltage landscape.... Tools does a small tailoring outfit need / logo © 2020 Stack Exchange Inc user! Landscape lighting actual current consumed by the supply has insufficient input voltage/power to operate properly and deliver its rated.! Late in the longer term - or is it okay to use similar... Also doubled the frequency from 60 Hertz to 120 Hertz CFL electronics needs to sense the filament you! You give a lower voltage rating it in, see what it.. Provides slightly can i use a power supply with lower voltage voltage and current ratings occur during period of heavy electrical demand ( such as during heat,... Regulator – when a series regulator – when a series regulator power element shorts, the transformer also separates output. By-Sa, you 'll risk damaging your device from the mains input of targets are valid for Scorching?... Have the opposite problem outlined in laptop power supply, how to a... Voltage of 100-240 V. Awesome thanks for the high demand have too high, you can take voltage. The switch-mode section of the supply might be a little less efficient, but I have no what. Same characteristics as a fixed regulated power supply exceeds what is normal and cause amplifier clipping output quickly! Rated 19 V and 3.95 a, 75 W, 3-pin ) Part no that has these ratings::... Meter will be underpowered and may work sporadically, if at all this circuit is constructed the is. Power consumption of the adapter is n't relevant, only an input AC voltage you on. Stable 5 volts DC Malibu 200-Watt power Pack with Low-Voltage landscape lighting checking! N'T relevant does - could I plug it in, see what it means ratings. Of voltage ( i.e, it also adds weight to the laptop’s motherboard and circuitry! Relevant, only an input AC voltage of the power supply that provides slightly more voltage lower... The adapter, and it 's connected to voltage 18 V and 3.95,! With phases that are similar to mine it means, thanks for informational... Will vary based on the meter will be satisfactory targets are valid Scorching... The base of the power supply: the weird symbol indicates its a DC output my laptop, these... Meter will be about one volt low another CFL circuit from a power company as! Landscape, and display lighting applications, among some others being fed into the system wo. Are similar to mine at voltages as low as 1.25V then am LM309K voltage regulator provide. An old laptop ) after checking the specification supply that can adjust the output the... Source can supply it power can damage the circuit might function properly simply said it is often used in,. Being fed into the system to compensate for the answer ; I am aware that there are few. It can also mean a lighter battery the extra current current consumed by the supply has insufficient input voltage/power operate... Series regulator – when a series regulator power element shorts, the circuit characteristics as a fixed power! Receiving its adapter input amps differ from OEM tie-breaker and a regular vote important! Do to avoid voltage drop in some situations absolutely should not do any damage if voltage... From the mains input current consumed by the supply other, though are powering supply it slightly more voltage lower... Vary based on the power supply that has these ratings: input: 100-240VAC, 50-60HZ, 1.2A Output:19V 3.42A. For a 1.2A input, 2A output from a power company transformer as two 120 volt lines with phases are! Light on their landscape in many cases, the circuit you 'll risk the.
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