Power Supplies
In choosing a power supply, you may be faced with choosing between a wall mount and desktop power supply. Each one has its share of pros and cons and choosing the right power supply will depend on your needs and preferences.
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Wall Mount Power Supply
A Few Basics
Wall mount power supplies have many names including AC adapters, wall bumps, wall adapters, wall warts, wall plug transformers, linear wall mount, power cubes. Regardless of the name, these power supplies are the most common source of low voltage power. They consist of small plastic boxes that plug directly into the wall but they come in a variety of performance and quality levels.
The wall mount power supply is a space-saving option because you only need to plug one end into the wall and the other into your device. It also saves time and energy.
These PS can be either:
- AC or DC
- Regulated or unregulated
- Regulated power supplies have voltage regulators on their output. The regulator ensures the output voltage will always stay at the rated value of the power supply, regardless of the current that the device is consuming.
- Unregulated power supplies produce a certain voltage at a particular current. That is, unregulated power supplies provide a constant amount of power (voltage x current). The output voltage will decrease as the output current increases, and vice versa requiring that one match as closely as possible the voltage and current requirements of the device the power supply is powering.
- Linear or switching Power Supplies
- The Linear power supply converts high voltage AC into the low voltage using a transformer and then converts it into DC voltage. It has low efficiency, is bulkier more reliable and faster than switching mode power supply (SMPS), there is no RF interference and is immune to noise and electromagnetic interference. This type of power supply is used in audio frequency applications and RF applications.
- The SMPS converts the input signal into DC first then it steps down the voltage up to the desired level. It has high efficiency, voltage regulation is done by the feedback circuit, is less bulky in comparison to a linear power supply, has a slower response time, RF shielding is required as switching produces more RF interference, EMI filters are required since noise and electromagnetic interference is significant. This type of power supply is used in chargers of mobile phones, DC motors etc.
Voltage
In choosing the correct wall mounted power supply you need to know what type of voltage your device needs: AC or DC. You should also look for a recommended charging current listed on the device you are powering. A further choice is whether the power supply is regulated or unregulated and whether it is a linear power supply or switching mode power supply.
The particular voltage requirements of the device are usually found written on the device itself. It is important to know the correct voltage requirement since providing either lower or higher voltages than required could have significant, deleterious effects
In the best of circumstance, if one uses a device with a lower voltage than specified, the device will not operate correctly in an obvious and immediate way. At other times the device might seem to be working correctly only to later fail under a particular circumstance. In other words, when you stray from the required specs, unexpected bad things may occur. Some devices can be damaged by too low a voltage for extended periods of time. If, for example, the device has a motor, it may not be able to develop enough torque to turn and just idles generating heat. It is also possible the device draws more current to compensate for the lower voltage. This higher than the intended current can cause damage to the device.
Using higher than specified voltage also can have significant consequences since electrical components all have voltages above which they fail.
Current Rating
The load is determined by the device. That is, a device that uses 2 A of current will draw 2 A of current whether the power supply can only provide the 2 A, or whether it could supply 3, 5, or any other A. The current rating of a supply is what it can deliver, not what it will always force through the load. As opposed to a voltage where higher than or lower voltage than needed can damage the device, the current rating of power supply must be at least what the device wants but there is no harm in it being higher.
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Replacing Existing Supply
When replacing a previous power supply, consider that power supply’s rating to be the device’s requirements. For example, if the device does not have a visible label but the device was powered from a 9 V and 1 A supply, you can replace it with a 9 V- and 1 or more-amp power supply.
Matching output connector and device’s plug socket
Choosing the right wall-mount power supply requires that the DC output connector matches your device’s plug socket This is a difficult specification to find on many of these power supplies since often the inner diameter of the plug/connector differs by only .4 mm. One can try calipers but this can be tricky to do accurately. You can buy one of a given diameter and then purchase an Adapter (2.1 to 2.5, or 2.5 to 2.1) 797 in case you buy the wrong one:
Desktop Power Supply
When one needs a power supply that provides more power than a wall adapter, the desktop power supply is the choice.
Desktop power supplies are very similar to wall adapters in that they both plug directly into the wall outlet and into the device. Desktop power supplies are able to provide more power than wall adapters, and also typically have a wider range of features and also more agency approvals. Desktop power supplies usually have 2 components: the actual supply with a DC cord attached, and the AC power cord. A desktop power supply may or may not come with an AC power cord. It is available in three standard sizes—2-prong standard cord, 3-prong standard cord, and a 3 Prong Mickey Mouse style cord (flat or round cord).
As with wall mount power supplies, the most important thing to assess is what type of DC connector the device will need. DC output connectors include 2.1mm or 2.5 mm inner diameter x 5.5mm outer diameter female, 3.5mm male, 4-pin, 5-pin, and 6-pin DIN male; and also, stripped and tinned wires.
Having chosen the correct connector one needs to choose the corresponding voltage and current outputs that match the specs of the device just as one did in choosing the wall adapter. The specifications should be listed on the actual device for which you are providing a power supply.
Applications of Power Supplies:
Power supplies are an elemental component of most electronic devices and are used in widespread applications.
Here are some of the applications:
- Medical: Power supplies for medical devices require multiple levels of certification depending on the proximity of the power supply and the patient. Examples of medical devices are ventilators, infusion pumps, surgical and dental instruments, imaging, intraarterial scopes, and devices.
- Computers: The power supply converts the alternating current (AC) line from the home to the direct current (DC) needed by the personal computer
- Electric Vehicles: A power supply unit is part of the necessary design to convert high voltage vehicle battery power.
- Machining:
- Industrial Automation/Robotics: refers to conveyors, assembly lines, bar code readers, cameras, motors, pumps, semi fab manufacturing
- Power supplies for Railway Signals
- Security power supplies
- Traffic Light Control Systems
Jasper Electronics (located in Anaheim, CA) provides a multitude of power supplies from wall mount to traffic control to medical devices. Please visit their website at www.jasperelectronics.com for further details on the many power supplies they provide. We invite you to call us at Peninsula Technical Sales where our highly technical staff can answer all your questions on how to choose the correct power supply. By reach us at 650-965-, by reach us at or visit our website at www.pentech.com.
Wall Mount vs. Desktop Power Adapters: Which One Is Right for You?
.09.11
In our increasingly digital and interconnected world, we rely on a wide array of electronic devices to keep us connected, informed, and entertained. From laptops and smartphones to gaming consoles and routers, these devices require a steady supply of power to keep us productive and entertained.
Power adapters are an essential part of our daily lives, and choosing the right type can make a big difference in terms of convenience and efficiency. One of the key decisions to make when selecting a power adapter is whether to opt for a wall mount or a desktop version. Here we'll briefly list the differences between these two types of power adapters and help you decide which one is right for you.
Wall mount power adapters are uniquely configured for mounting directly on a wall or power outlet. These adapters are commonly used to power devices that require a constant power supply and benefit from a fixed installation. Wall mount power adapters are known for their space-saving design, as they help declutter workspaces and reduce the risk of accidental disconnections. They often feature a sleek, unobtrusive appearance and can be installed securely on the wall, making them a practical choice for devices like security cameras, digital displays, and routers.
Advantages of Wall Mount Power Adapters
Space-Saving: Wall mount power adapters are designed to be mounted directly on the wall or a power outlet. This can be a game-changer if you're dealing with limited desk or floor space. By mounting the adapter on the wall, you free up valuable space for other devices or decor.
Safety: Wall mount power adapters are less likely to be accidentally tripped over or pulled out of the socket. This can help prevent damage to both the adapter and the connected device, reducing the risk of power surges and interruptions.
Clean Aesthetic: Wall mount adapters often have a sleek and minimalist design that can enhance the overall look of your workspace. They blend seamlessly into the room, keeping cables and adapters out of sight and providing a clean and uncluttered appearance.
Consistency: With a wall mount adapter, the location of your power source is fixed and doesn't move. This can be especially useful for devices that require a constant power supply, such as routers, security cameras, and digital displays.
Desktop Power Adapters
Desktop power adapters are designed for powering a wide range of electronic equipment when placed on a flat surface, such as a desk or tabletop. They offer flexibility and easy access, allowing users to connect and disconnect devices without the need for wall mounting. Desktop power adapters are suitable for portable electronics like laptops, smartphones, and various gadgets due to their mobility. They often come with multiple ports and connectors to accommodate diverse devices and may include features like surge protection.
Advantages of Desktop Power Adapters
Portability: Desktop power adapters are designed to be placed on a desk or any flat surface, providing you with the flexibility to move and position them as needed. This makes them ideal for devices like laptops, smartphones, and other portable electronics.
Easy Access: With a desktop adapter, you have easy access to the power source, allowing you to quickly plug in and unplug your devices without the need for any installation or wall mounting.
Compatibility: Many desktop power adapters come with multiple ports and connectors, making them suitable for various devices. They are also generally compatible with a wider range of devices due to their flexible nature.
Adaptability: Desktop adapters can easily accommodate different voltages and plug types, making them suitable for international travel or for use with devices from different regions.
Making Your Decision
The choice between a wall mount and a desktop power adapter depends on your specific needs and preferences. Here are some factors to consider when making your decision:
Space: Do you have limited desk or floor space? If so, a wall mount adapter might be the better choice.
Mobility: Do you need the flexibility to move your power source around? If yes, a desktop adapter is more suitable.
Device Compatibility: Consider the types of devices you'll be connecting and whether a particular adapter type supports them.
Installation Comfort: Are you comfortable with wall mounting, or do you prefer a plug-and-play solution?
Aesthetic Preferences: Think about how the adapter's design and placement align with your room's aesthetics.
Safety Concerns: Consider the risk of accidental disconnections or damage to the adapter and devices.
In conclusion, the choice between a wall mount and a desktop power adapter depends on your specific requirements, workspace setup, and device needs. Whether you go for a sleek wall mount solution or a versatile desktop adapter, prioritize functionality, aesthetics, and safety for a well-rounded power experience in your everyday life.
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