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Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery . The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest charging solutions for handheld equipment. Lithium ion Charger Circuit diagram Also , using this charger solution the power source is optimized by the MAX8844Z using automatically select function between the USB or IN power source but if are both power sources connected the highest priority is for IN power source to ensure the shortest charging time for the system . The MAX8844 charger chip accept an input voltages range from 4.25V to 28V (IN and USB), but the charging is disabled if the input voltage exceeds +7.5V for protection against unqualified or faulty AC adapters. These charger IC is very...

The following post explains a very simple yet safe Li-Ion battery charger circuit using just a single IC LP2951. Unlike lead acid batteries one good thing about the Li-Ion batteries is that they can be charged at 1C rate initially. It means the charging current may be as high as the rated AH of the battery at the onset. The design presented in this article can be used for charging a single 3.7V Li-ion cell or a standard cell phone battery externally at a relatively slower rate. The diagram depicts a configuration which was used for charging a Li-Ion cell of a portable stereo unit. The charging specification of the circuit may be summarized as under: Maximum charging current = 150mA Full charge volt = 4.2V +/- 0.025V Charge Current = set at current limit charge mode.    In the given circuit the IC LP2951 becomes the main active component which has been specifically chosen because it is capable of delivering an output voltage that's very stable over temperature. The...

You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current of 300-350 mA. Using it you can charge three types of batteries: lead acid, Ni-Cd and Li-ion. The lead-acid batteries are commonly used in emergency lamps and UPS. The working of the circuit is simple. The output of the solar panel is fed via diode 1N5402 (D1), which acts as a polarity guard and protects the solar panel. An ammeter is connected in series between diode D1 and fuse to measure the current flowing during charging of the batteries. As shown in Fig. 1, we have used an analogue multimeter in 500mA range. Diode D2 is used for protection against reverse polarity in case of wrong connection of the lead-acid battery. Charger circuit diagram: Solar Panel Based Charger Circuit Diagram When you connect wrong polarity, the fuse ...

Nicad battery charger , this circuit just use transformer not  CT and  3 LEDs lamp. And its very very simple circuit charger . This circuit constant current LEDs to adjust charging current. It uses LEDs that pass a constant  current about 15 mA for an applied voltage range of 2 to 18 Volt. They can be paralleled to give any multiple of 15 mA and they light up when current is flowing. The circuit will charge single cell at 15 , 30 , or 45 mA , or cells in series up to the rated supply voltage limit about 14 Volt. See schematic below : Click to view larger

The ASUS Eee is a fantastic ultra-portable notebook with almost everything required for geeks (and nothing that isn’t). Plus it features fantastic build quality and is very well priced. If you live in New Zealand you can get them from DSE; at the time of writing they are the exclusive supplier. I worked out it’s the same cost as importing one once you include all the duties and tax, plus you get the advantage of a proper NZ-style mains charger. Anyway, being so small I thought it would be nice to be able to carry this around in the car. Unfortunately I couldn’t find a car charger available anywhere at the time so I decided to tackle the problem myself. As a bonus this provides an opportunity for an external high-capacity battery. Commercial Equivalent: I thought at this stage it would be worth noting that a commercial car charger is now available for less than it cost me to build this from Expansys and is available in most countries (select your location on their site). It outputs 9.5v...

As we know now a days the main problem is charging of a cell phone when we haven't electricity . And this problem is getting bigger when we have more than one cell phone. So here is the circuit which can be solve our problem for charging more than One cell phone. This circuit of the double DC cell phone charger was successfully tried. The required voltages for the operating of this circuit is 12V DC from a battery source.The transistor T1 which we are using is PnP transistor.The general purpose of this transistor is power application e.g driver stages.The IC1 (7805) is a voltage regulator ic which we are using in this circuit. Parts List R1 = 0.1 Ohms 2 watt, R2 = 2 Ohms 2 Watt R3 = 3 Ohms 1 watt C1 = 100uF/25V C2 = 0.1 disc T1 = BD140 D1 = 1N5408 IC1 = 7805

This circuit was designed to charge Nicad battery packs in the range of 4.8 to 15.6 V from a convenient remote power source , such as automobile battery. When power is first applied to the circuit applied to the circuit , a small bias current supplied by R1 via winding L1 , starts to turn on the transistor TR1. This forces a voltage across L2 and the positive feedback given by the coupling of L1 and L2 causes the transistor to turn hard on , applying the full supply across L2. The base drive voltage induced across L1 makes the junction the necessary base current to hold Q1 on. Component List Resistor R1 = 1M R2 = 120R R3 = 10R R4 = 39R Capacitor C1 = 100uF 25V C2 = 0.01uF C3 = 4700pF C4 = 100uF 25V Diode D1 = 1N4148 D2 = BYV27-5 D3 = BYV27-5 Transistor Q1 = ZTX650 Transformer L1 = 12T 36awg L2 = 13T 36awg L3 = 20T 30awg L4 = 40T 30awg Core FX3437 with gap of 0.08mm Former DT2492

This is a heavy duty but low-cost Electronic Circuit . The operation amplifier A1 directly drives the VN64GA with the error signal to control the output voltage. Peak rectifier Dl, CI supplies error amplifier A1 and the reference zener. This extra drive voltage must exceed its source voltage by several volts for the VN64GA to pass full load current. Heavy Duty But Low-Cost Battery charger Circuit Diagram: The output voltage is pulsating dc which is quite satisfactory for battery charging. To convert the system to a regulated dc supply, capacitor C2 is increased and another electrolytic capacitor is added across the load. The response time is very fast, being determined by the op-amp. The 2N4400 current limiter circuit prevents the output current from exceeding 4.5 A. However, maintaining a shorted condition for more than a second will cause the VN64GA to exceed its temperature ratings. A generous heat sink, on the order of 1°C/W, must be used.

At this time I will share about the series used in the usb to charge battery. Issued voltage 4.7 Volt to 5 Volt DC suitable for battery charge the phone, as well as other batteries.  Below is a circuit where the voltage is removed the usb on the computer will be strengthened by several components so that the voltage used to charge batteries more powerful and filtered, and will make it more durable and long lasting. Part List : R1 = 1 K R2 = 330 R R3 = 4K7 R4 = 300 R R5 = 27R D1 = 4.7 volt zener /1W C1 = 100uF/16V Q1 = BC548 Q2 = BC558A

This Pb137 charger circuit electronic project can be used for charging lead acid battery. Using the PB137 voltage regulator circuit and some other electronic parts can be designed a charger which is capable to provide 1.5A at 13.7 volts. PB137 is designed by ST Microelectronics in a TO-220 package and is a complete constant voltage battery charger with reverse polarity protection , over temperature protection , over voltage protection and short circuit protection . PB137 Charger Circuit diagram

Here is a simple, solar charger circuit that uses a shunt regulator to prevent overcharging. Circuit uses a 12V solar battery, but can be adapted for other voltages. Solar Battery Charger Circuit Diagram: Notes: This is a simple, solar charger circuit that uses a shunt regulator to prevent overcharging. SC1 is a 12 Volt solar panel with a rating of 40 Watt. RS is not in the circuit but represents the solar cells internal resistance. The solar cell, powers a simple op-amp voltage regulator. R2 and D2, hold the non-inverting input of the op-amp at 5.1 Volt. The voltage on the inverting input is set by VR1 and R1. Under charging conditions, the output of the op-amp is low and all voltage, reaches battery B1. Diode D1 prevents the battery from powering the circuit when there is no output from the solar cell. When there is an excess of sunlight, the op-amp output will swing high, switching on the BDW193 darlington transistor, and excess energy is dissipated into the load, R4. This is a 2.2 ...

Battery Charger > In this my circuit , which is one of a series of simple battery charger , but this circuit to charger the Nicad battery . This circuit included with current and voltage limting . Why use it ?? because with current voltage you can choose voltage to charge a battery , and the limiting voltage use limit voltage if the battery is fully, because if battery fully that damaged quickly. See this schematic below : Click to view Enlarge Lamp 1 will glow brightly and the LED will be out when the battery is low or run out and the circuit is processing being to charged , but the LED will bright and the light dim when the battery is almost ready. Output voltage between 12 to 14 volt with current 100 mA.

This is the simple 24V 7Ah Lead Acid Battery Charger Project. This lead acid battery charger circuit is designed in response to a request from Mr.Devdas .C. His requirement was a circuit to charge two 12V/7AH lead acid batteries in series. Anyway he did not mentioned the no of cells per each 12V battery. The no of cells/battery is also an important parameter and here I designed the circuit assuming each 12V battery containing 6 cells. When two batteries are connected in series, the voltage will add up and the current capacity remains same. So two 12V/7AH batteries connected in series can be considered as a 24V/7AH battery . 24V 7Ah Lead Acid Battery Charger Circuit Diagram The circuit given here is a current limited lead acid battery charger built around the famous variable voltage regulator IC LM 317. The charging current depends on the value of resistor R2 and here it is set to be 700mA. Resistor R3 and POT R4 determines the charging voltage. Transformer T1 steps down the mains vo...

This design is inspired by the Minty Boost but it fixes some of the issues that I had with it. The Minty Boost is limited to 600mA due to the LT1302 chip. The Super Boost uses the LM2700 which can push up to 3.6A. This will enable i-devices to draw up to there maximum of 1A which will enable a faster recharge. [ ]

Hi everybody, Now I am here with a Automatic Battery Charger circuit having overcharge protection feature . In one of my previous post, we were discussed about a battery charger circuit. For that, the battery gets continously charged, and this overcharging affects the performance of the battery seriously. Today I am with a solution for that, as usual the circuit is simple to wire up, it consists only a few components and you can make this at your home itself. This circuit eliminates the battery draining due to overcharge, because the charger turnoff after the charging is made completed. Read More.....

Series NIMH Battery Charger with IC LT4060 is a NIMH battery charger is powerful, effective and efficient. Featur owned by IC LT4060 is a specialization of a NIMH battery charger. NIMH Battery Charger with IC LT4060 can perform safely charging NIMH batteries because it comes with a battery temperature protection is in charge and the peak level detection system of the battery voltage is in charge.  Battery temperature protection system from the excessive use of NTC temperature sensor. Series NIMH Battery Charger with IC LT4060 also features a charging indicator that will light up when charging and will die when the battery is full. IC 4060 used in this NIMH battery charger from Linear Technology is a production that is designed special for NIMH battery charger. Image Series NIMH Battery Charger with IC LT4060 Description Series NIMH Battery Charger with IC LT4060 R2 potentiometer used for setting the maximum temperature (at set at the value of 4K) LED D1 is a battery charging indica...

A simple NiCd battery charger powered by solar cells. A solar cell panel or an array of solar cells can charge a battery at more than 80 % efficiency provided the available voltage exceeds the ‘fully charged’ battery voltage by the drop across one diode, which is simply inserted between the solar cell array and the battery. Adding a step-down regulator enables a solar cell array to charge battery packs with various terminal voltages at optimum rates and with efficiencies approaching those of the regulator itself. However, the IC must then operate in an unorthodox fashion (a.k.a. ‘Elektor mode’) regulating the flow of charge current in such a way that the solar array output voltage remains near the level required for peak power transfer. Here, the MAX639 regulates its input voltage instead of its output voltage as is more customary (but less interesting). Solar-Powered High Efficiency Battery Charger Circuit Diagram The input voltage is supplied by twelve amorphous solar cells with a mi...

This is a smart battery charger can protect your vehicle's battery from failing and will prolong its life – they're fully automatic so you can connect and forget.

Extension for LiPo Charger Project Image The ‘Simple LiPo Charger’ published in Elektor Electronics April 2005 is a small and handy circuit that allows you to quickly charge two or three LiPo cells. Especially in the model construction world are LiPo batteries used a lot these days, particularly model aeroplanes. It is usual to use a series connection of three cells with these models. Since working with these model aeroplanes usually happens in the field, it would be nice if the batteries could be charged from a car battery. We therefore designed a voltage converter for the LiPo charger concerned, which makes it possible to charge three cells in series. The voltage per cell increases while charging to a value of about 4.2 V, which gives a total voltage of 12.6 V. The converter, therefore, raises the 12-V voltage from the car battery to 16.5 V, from which the LiPo charger can be powered. Extension for LiPo Charger Circuit Diagram A step-up controller type MAX1771 in combination w...

In recent years, the use of USB or Universal Serial Bus as a reliable communications interface in plenty of electronic devices have increased due to its increased speed, size and flexibility. It fundamentally consists of terminals VBUS(+5V supply), GROUND, D+ and D-. As plenty of of the devices run on rechargeable battery, it is now the trend to design the charging circuit that makes use of the power supply from the USB port to charge the rechargeable battery. This feature will make the devices more convenient to the users as the devices will get their power from the bus and requires no outside plug or cables. USB Bus Powered Functions There's fundamentally three classes of USB functions on power that can be derived from the port.   High-Power Bus The high power bus powered functions derived all its power from the VBUS and cann't draw over 100mA until it's been configured. One time configured, it can draw up to five unit loads(500mA) by requesting it in its descriptor. At...