Some Chargers on the market are purely simple Chargers. These types of Chargers take much longer to recharge the Battery Packs within the device and will not alter the amount of power delivered to the Battery after the Battery is fully charged.
Due to this, over charging can occur, leaving the Batteries weakened or permanently damaged. Fun fact Continued:. As it designed to give a constant output, your Phone actually does all the charge control.
This is designed to offer flexibility so your phone can be plugged into any USB port, on your PC for example. Contact Form. Newsletter Sign-up. Can you spot the Difference? Power Supply — noun — a device providing power to electronic equipment Charger — noun — an apparatus that charges storage Batteries In short - a Power Supply is intended to provide a constant voltage to static applications, whereas a Charger is designed to provide a continuously regulated current to mobile devices, which have an integrated Battery.
Fun fact! Want to know more about Power Supplies? Click here to read. Want to know more about Batteries? Want to know more about Chargers? BLOG Selection and operation of a battery charger.
View our Chargers. View our Power Supplies. Thank you for contacting us. AC-DC Conversion Basics 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.
Figure 1: Alternating Current from Wall Outlet In the first step of the process, the voltage is rectified using a set of diodes. Figure 2: Full Wave Rectified Once the voltage has been rectified, there is still fluctuation in the waveform—the time between the peaks—that needs to be removed. Figure 3 shows the rectified voltage and how the capacitor smooths the droop. Power Supply Comparisons AC power supplies come in two varieties, unregulated and regulated.
Table 1: Types of Power Supplies. Unregulated Power Supply Theory Because unregulated power supplies do not have voltage regulators built into them, they typically are designed to produce a specific voltage at a specific maximum output load current. Figure 4: Block Diagram — Unregulated Linear Supply The advantages of unregulated power supplies are that they are durable and can be inexpensive. NOTE: Wavelength does not recommend using unregulated power supplies with any of our products.
Regulated Power Supply Theory A regulated DC power supply is essentially an unregulated power supply with the addition of a voltage regulator.
Figure 5: Block Diagram — Regulated Supply In regulated power supplies, a circuit continually samples a portion of the output voltage and adjusts the system to keep the output voltage at the required value.
Linear, Switched, or Battery-based? Figure 6: Block Diagram — Regulated Switching Supply One of the advantages of switched mode is that there is a smaller loss across the switch. Selecting a Power Supply When choosing a power supply, there are several requirements that need to be considered.
The power requirements of the load or circuit, including voltage current Safety features such as voltage and current limits to protect the load. Physical size and efficiency.
Noise immunity of the system. Current Overload Warning Along with the above considerations, the power supply must operate below its maximum rated output current.
Important Specifications While all power supply specifications are valuable, some are more critical than others. Can I use the same power supply to drive my temperature and laser controllers? Yes, as long as the voltage selected meets the needs of the load and is within the Safe Operating Area SOA of the controller, and the laser, thermoelectric, and temperature sensor are not electrically tied through ground.
Can I use the same power supply to drive several temperature controllers at the same time? Yes, but they should be connected using star individual connections rather than serial linked connections to ensure that the voltage to each unit is the same. Can I use a 30 V power supply with a temperature controller whose specifications are for 5 V — 30 V?
Yes, if the load voltage is high enough. Use the Safe Operating Area SOA calculator for the controller to determine if the load and the power supply voltage are compatible.
If allowed, subtract the compliance voltage drop across the controller from 4. How long should my cables be? Longer cables introduce more noise and allow for more voltage drop between the power source and the load. To minimize the affects of noise, twist the cables together or use shielded cables. To help minimize voltage drop, keep them as short as possible. What gauge wire should I use? The gauge determines the current carrying capacity and needs to exceed the specification of the load.
For example, using Table 2, which shows some standard gauges and carrying capacities for solid wire, a 20 gauge wire, not a 22 gauge wire, would be required for a load of 2 A. This is because the 20 gauge wire allows a 3. About Us.
Contact Us. To purchase, contact us directly or locate a distributor near you. Phone: How To Reach Us. As the load requirements change, it continues to supply a fixed DC level. A true battery charger generally supplies a regulated current, first to charge the battery, and then switches to a regulated voltage mode.
This is specifically required for Li-Ion chemistry where overcharging is not only damaging to the battery cells, but can also pose a possible fire hazard. A smart battery charger will not only never overcharge cells, but can also monitor battery temperature, switching off a fast charge when certain parameters are exceeded. A power supply used as a charger cannot do this, and will continue to pump energy into a battery regardless of its condition; fully charged, battery fault, or shorted cells.
Show 2 more comments. Active Oldest Votes. Olin Lathrop Olin Lathrop k 36 36 gold badges silver badges bronze badges. I have a 1uF cap from the positive terminal of my battery going to ground already, though I'm using an electrolytic one. I will try your suggestion of using a uF cap.
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