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Replacement Laptop DC Car Power Adapters for NEC

Are you looking for it: high quality NEC DC car adapter, discount NEC DC car adapter, cheap NEC DC car adapter? Well, rest assured that the best value for your replacement adapter is not the original manufacturer.
Please select your NEC model below to find a suitable replacement Laptop DC (in-car) Adaptor
ES Pro LaVie C Series Model LC500J/34DR LaVie NX Series Model LW36H/12C6
LC50H/33DR LC50H/34CA1 LC50H/34DA1
LC50H/34DB1 LC600J/34DA LC600J/34DR
LC700J/34DL LW36H/12D6 LW40H/13C6
LW40H/13D6 LW40H/14CW LW40H/14DW
LW43H/14CA LW43H/14DA LW43H/22C6
LW43H/22D6 LW43H/23C6 LW43H/23D6
LW450J/13CA LW450J/13DA LW450J/14CV
LW450J/14DV LW450J/24CA LW450J/24DA
LW450J/24DW LW450J/24EA LW45H/23DR
LW45H/24DR LW46H/14CA LW46H/14DA
LW500J/24CA LW500J/24DA LW500J/24DR
Ready 120T Ready 220T Ready 330T
Ready 340T Ready 360T Ready 440T
Versa 2400 Versa 2400CD Versa 2400 Series
Versa 2405 Versa 2405CD Versa 2430CD
Versa 2435CD Versa 2500 Versa 2500 Series
Versa 2530 Versa 2530CD Versa 2530CD ES Pro
Versa 5000 Versa 5060 Versa 5060X
Versa 5080 Versa 5080X Versa 550
Versa Aptitude Versa E2000 Versa E6000
Versa LX Versa Lxi Versa LXi
Versa M320 Versa Pro D Model VA10H/DF/G Versa Pro NX Model VA50H/WT/9
Versa Pro W Model VA10J/WX/C Versa S3000 Versa SX
Versa VX Versa Vxi
The adapter supplied by our Company are [replacement for] sold for use with certain products of computer manufacturers, and any reference to products or trademarks of such companies is purely for the purpose of identifying the computers with which our products [are replacement for] may be used. Our Company and this Website are neither affiliated with, authorized by, licensed by, distributors for, nor related in any way to these computer manufacturers, nor are the products offered for sale through our Website manufactured by or sold with the authorization of the manufacturers of the computers with which our products [are replacement for] may be used.

Power adapters come in two basic varieties AC/AC and AC/DC:

AC/DC— In its most basic form, a diode is added to the AC/AC adapter circuitry to create an AC/DC power adapter. The lowest cost DC power adapters use half wave rectification, however generally for few cents more you can a full wave rectification.

Common today is the center-tapped design where each half of the secondary transformer winding is idle half of the time. The primary drawback to this design is you have to use a bigger transformer to get the same power output.

The single diode, half wave rectification DC adapter is ideal for use in toy motors, battery adapters and other applications where the 100% ripple and 50% duty cycle won’t affect performance. Simply adding a capacitor can smooth out the ripple, but since it typically needs a larger capacitor at a higher cost than full wave bridge rectification, the design decision is usually in favor of the full wave rectifier.

Full wave rectifiers also have 100% ripple though the DC component of the power frequency spectrum that is much larger than that with half-wave adapters. Adding a capacitor can smooth out the ripple to some extent; however if ripple is important to you, you need to specify it. The reason? As a capacitor gets bigger, it also gets more expensive, and extra expense is what most manufacturers avoid in this highly price sensitive market.

So far none of the AC/DC power adapters mentioned have added line regulation. It is possible to add a three terminal voltage regulator to the adapter to perform volt line and load regulation, but the limited heat sinking capability limits these adapters to low power applications. If you need well-regulated power, you may want to consider using an unregulated power adapter and handle the filtering and regulation in your own product or use a switching power supply that supports a wider range of input voltages. System Connection offers regulation as an option in all our OEM power supplies, linear or switching

The range of output connectors for wall-plug power supplies is unlimited, but the most popular are listed on our Design Your Own Power Adapter form. The most commonly used is the 5.5 x 2.5 mm barrel connector, with center positive. The cost affect is minimal between the various phonon style plugs so just select the version that best matches the design requirements of the project, and decide if cable should exit the mold at 90 degrees or 180 degrees.

Wall plug-in power adapters are certified by safety agencies. The adaptors are required to have a thermal fuse to protect against fire if there is a short circuit. Typically, they are soldered-in glass tube type fuses, which are not user replaceable. Glass tube fuses protect the primary side of the transformer and are rated at 240 volts. Don’t get confused by this rating, even a 110 volt input wall power adapters is designed with a fuse rated at 240 volts. The current rating is typically two to three times the rated input current.

Power adapters with UL, TUV, CUL, etc safety approvals will have the input windings of the transformer isolated from the output windings. It is important to note that there is a capacitance between the windings, which could result in a small AC leakage current to ground.

Adapters with safety agency certifications should be properly isolated, eliminating the need for a polarized connector, or a three-pin plug. While it may be useful in certain applications to have a ground connection to reduce hum, such power adapters are rare for commercial applications.

This safety certification is a design advantage because when wall mount power adapters have all the necessary safety agency certifications, you avoid the cumbersome, time consuming and costly safety certification process you would need to endure if you had AC going into your product. For this reason, AC adapters have become so ubiquitous on many of the products we see today.


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