DC to DC Converters
Automatic 12V Lead Acid Battery Charger
System Features The Sentinel system uses one Monitor, with the option of Measurement Modules (voltage measurement) or the m‐Senzor (voltage and ohmic measurement). Voltage monitoring will identify incorrect charge voltage and faults such as a short circuit in a battery/jar, which causes a drop in voltage. Capacity is determined through a discharge test. Applicable for vented batteries/jars or entry level monitoring for VRLA batteries/jars where regular testing is undertaken. The base m‐Senzor provides voltage and soon to be introduced ambient temperature near the battery/jar. Solaris Power Systems
Solaris Power Systems Sizing a Battery Charger Battery Chargers should be large enough to power the normal system loads while recharging a discharged battery within a reasonable amount of time. Manufacturers recommend a recharge time of 8 to 12 hours. Shorter recharge times require larger battery chargers and might result in excessive current flow into the battery during the recharge process. For this reason, 8 hours is usually the minimum recharge time for a discharged battery. On the high end, 12 hours is often recommended for an upper limit; however, this recharge time is somewhat arbitrary and 14 hours or 16 hours might be acceptable, depending on the application and how the recharge is controlled.
Battery Charging Tutorial | ChargingChargers.com Current battery charging technology relies on microprocessors (computer chips) to recharge, using 3 stage (or 2 or 4 stage) regulated charging. These are the "smart chargers", and quality units generally are not found in discount stores. The three stages or steps in lead/acid battery charging are bulk, absorption, and float. Qualification, or equalization are sometimes considered another stage.
Lead Acid Battery Charger Circuit This changes the conduction of Q1. Since collector of Q1 is connected to adjust pin of IC LM317 the voltage at the output of of LM 317 increases. When battery is fully charged charger circuit reduces the charging current and this mode is called trickle charging mode. Notes: Connect a battery to the circuit in series with a ammeter.Now adjust R5 to get the required charging current. Charging current = (1/10)*Ah value of battery. Input to the IC must be minimum 15V to get 12 V for charging the battery .Take a look at the data sheet of LM 317 for better understanding.
(C) G. Forrest Cook June 23, 2006 Power this project from sunlight with a CirKits solar power circuit board kit. Introduction Buck Mode Switching Regulator for Solar Applications
SCC3 20A 12V Solar Charge Controller Electronic Circuit - CircuitsArchive Introduction The SCC3 is a solar charge controller, it's function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic overcharging, and automatic temperature compensation for better battery charging over a wide range of temperatures. The design goals of this circuit were efficiency, simplicity, reliability, and the use of field replaceable parts. A medium power solar system can be built with the SCC3, a 12V solar panel that is rated from 100 milliamps to 20 amps, and a lead acid or other rechargeable battery that is rated from 500 milliamp hours to 400 amp hours of capacity. It is advisable to match the solar panel's maximum current to the battery's amp-hour rating (C), a typical battery charging current is C/20, so a 100 amp hour battery should have a solar panel rating of around 5 amps.
DC/DC Converters, to convert voltage up or down, retail, wholesale, off-the-shelf and custom, DC/DC 5 watts to 1500 watts, voltage from 1.5V to 72V, DC/DC power supplies
Note that all voltages are referenced to the same common (if you need to measure any voltage, connect the return lead of your voltmeter to any of the COM contacts). Also note that many brands such as Apple's Power Mac, Dell (during certain years), Compaq and HP had proprietary boards with entirely different pin designations- see this for info on some brand name power supplies. The rated current of the main Molex connector is 6A per contact. This means with the old 20-pin style you can't get more than 18A from 3.3V and 24A from 5V. That's why in early 2000's, some motherboards with 3.3V >18A and 5V >24A (mainly dual CPU AMD systems) used an auxiliary 6-pin power cable. It was removed from ATX12V spec v2.0 in 2003 because extra wires were added to P1. ATX Computer Power Supply Pinout and Connectors
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Buck-Converter Design Demystified Page of Stepdown (buck) switching converters are integral to modern electronics. They can convert a voltage source (typically 8 V to 25 V) into a lower regulated voltage (typically 0.5 V to 5 V). Stepdown converters transfer small packets of energy using a switch, a diode, an inductor and several capacitors. Though substantially larger and noisier than their linear-regulator counterparts, buck converters offer higher efficiency in most cases.
ProCooling.com Let me explain the schematic (or circuit diagram, whatever you want to call it). The ICs on the board are Analog Devices ad1193 FET drivers (U1 and U2); these connect to the gate of the N-Channel mosfet (International Rectifier IRF 1407, M1 and M2). The 15V zener diode (D1 and D2) is just protection, to make the circuit a little safer. The FET drivers take in 12v, and turn it into 18v at a very low current, saturating the mosfet gates beyond the VGS barrier (Vs + 4). This lets the mosfet act like a very low ohm resistor, and restricts the current very little. It may produce a little heat, but it is not much (your sound card will more than likely put out more heat than this will ;) ).
Hot Swap Power Management - ORing Controller - TPS2410 The TPS2410/11 controller, in conjunction with an external N-channel MOSFET, emulates the function of a low forward-voltage diode. The TPS2410/11 can be used to combine multiple power supplies to a common bus in an N+1 configuration, or to combine redundant input power buses. The TPS2410 provides a linear turn-on control while the TPS2411 has an on/off control method. Applications for the TPS2410/11 include a wide range of systems including servers and telecom. These applications often have either N+1 redundant power supplies, redundant power buses, or both. These redundant power sources must have the equivalent of a diode OR to prevent reverse current during faults and hotplug.
M4-ATX Automotive Power Supply Free Shipping Logic Supply offers Free Economy Shipping within the United States on all online orders of $250 and above. If your purchase qualifies for Free Economy Shipping, you will see this option available at the time of checkout.
Last updated: July 15, 2008 All about the various PC power supply cables and connectors The various power supply cables General info If you'd like more technical data about ATX power connectors then you can find the current specifications and more at formfactors.org All about the various PC power supply cables and connectors
12 Volt 30 Amp Power Supply Circuit : Andy CollinsonEmail : Description Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps. The design is shown below: