Auto turn off battery Auto turn off battery

charger charger

PRESENTED BYPRESENTED BY

P.VINAY 08UK1A0406P.VINAY 08UK1A0406

CH. DEEPTHI 09UK5A0401CH. DEEPTHI 09UK5A0401

B.SATHVIK VARMA 08UK1A0407B.SATHVIK VARMA 08UK1A0407

UNDER THE GUIDENCE UNDER THE GUIDENCE OF OF

Mr.M.SANJAYMr.M.SANJAY

www.powerpointpresentationon.blogspot.com

INTRODUCTIONINTRODUCTION

An Auto turn off battery charger is a good option for An Auto turn off battery charger is a good option for people who don’t like having to mess with the people who don’t like having to mess with the battery charging process too much battery charging process too much

Simply hook our battery up to an Auto turn off Simply hook our battery up to an Auto turn off battery charger and we will find that it proceeds to battery charger and we will find that it proceeds to charger our battery automatically. charger our battery automatically.

When the battery is charged it will shut off. Hooking a When the battery is charged it will shut off. Hooking a battery up to an Auto turn off battery charger is battery up to an Auto turn off battery charger is really easy too. really easy too.

Simply hook the alligator clips up to the battery posts Simply hook the alligator clips up to the battery posts and leave the Auto turn off battery charger plugged and leave the Auto turn off battery charger plugged in. A battery will never get overcharged with an Auto in. A battery will never get overcharged with an Auto turn off battery charger. turn off battery charger.

Many people choose an Auto turn off battery charger Many people choose an Auto turn off battery charger over a manual battery charger can fry our batteries over a manual battery charger can fry our batteries by not shutting off when the battery is charger up. by not shutting off when the battery is charger up.

This can cause a lot of headaches and prevent us This can cause a lot of headaches and prevent us from getting the life expectancy out of the batteries from getting the life expectancy out of the batteries we purchase.we purchase.

Circuit diagram Circuit diagram

OperationOperation

In the AC-to-DC converter section, In the AC-to-DC converter section, transformer X1 steps down mains 230V AC to transformer X1 steps down mains 230V AC to 9V AC at 750 mA,9V AC at 750 mA,

which is rectified by a full-wave rectifier which is rectified by a full-wave rectifier comprising diodes D1 through D4 and filtered comprising diodes D1 through D4 and filtered by capacitor C1.by capacitor C1.

Regulator IC LM317 (IC1) provides the Regulator IC LM317 (IC1) provides the required 12V DC charging voltage.required 12V DC charging voltage.

When you press switch S1 momentarily, the When you press switch S1 momentarily, the charger starts operating and the power-on charger starts operating and the power-on LED1 glows to indicate that the charger is LED1 glows to indicate that the charger is ‘on.’‘on.’

The relay driver section uses PnP transistors The relay driver section uses PnP transistors T1, T2 and T3 (each BC558) to T1, T2 and T3 (each BC558) to Energies Energies electromagnetic relay RL1 is connected to the electromagnetic relay RL1 is connected to the collector of transistorT1.collector of transistorT1. Transistor T1 is driven by PnP transistor T2, Transistor T1 is driven by PnP transistor T2, which, in turn, is driven by PnP transistors T3. which, in turn, is driven by PnP transistors T3. Resistor R4 (10-ohm, 0.5W) is connected Resistor R4 (10-ohm, 0.5W) is connected between the emitter and base of transistors between the emitter and base of transistors T3.T3.When a current of over 65 ma flows through When a current of over 65 ma flows through the 12V line, it cause a voltage drop of about the 12V line, it cause a voltage drop of about 650V across resistor R4 to drive transistors 650V across resistor R4 to drive transistors T3 and cut off transistors T2. This, in turn, T3 and cut off transistors T2. This, in turn, turns transistors T1 ‘on’ to energies relay turns transistors T1 ‘on’ to energies relay RL1.RL1.Now even if the pushbutton is released, Now even if the pushbutton is released, mains is still available to the primary of the mains is still available to the primary of the transformer through its normally open (N/O) transformer through its normally open (N/O) contacts.contacts.

About I.C used in this About I.C used in this experimentexperiment The LM 317 is a popular variable ‘Voltage Regulator’.The LM 317 is a popular variable ‘Voltage Regulator’. It is an adjustable 3- terminal positive voltage regulator capable of It is an adjustable 3- terminal positive voltage regulator capable of

supplying 100mA over a 1.2 to 3.7 output range.supplying 100mA over a 1.2 to 3.7 output range. It is easy to use It is easy to use This offers full over load protection included on the chip are Current This offers full over load protection included on the chip are Current

Limit, Thermal Overload Protection and Safe Area Protection.Limit, Thermal Overload Protection and Safe Area Protection. All over load protection circuitry remains fully functional even if the All over load protection circuitry remains fully functional even if the

adjustment terminal is disconnected adjustment terminal is disconnected it makes an especially simple adjustable switching regulator, a it makes an especially simple adjustable switching regulator, a

programmable output regulator, or by connecting a fixed resistor programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317L can be used as a between the adjustment and output, the LM317L can be used as a precision current regulator. Supplies with electronic shutdown can precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current.programs the output to 1.2V where most loads draw little current.

SpecificationsSpecifications VVoutout range 1.25V - 37V range 1.25V - 37V

VVinin – V – Voutout difference 3V - 40V difference 3V - 40V Operation ambient temperature 0 - Operation ambient temperature 0 -

125°C 125°C Output IOutput Imaxmax <1.5A (assuming factory- <1.5A (assuming factory-

suggested heat sinking) suggested heat sinking) Minimum Load CurrentMinimum Load Currentmaxmax 10mA 10mA

About relayAbout relay

This is an electrically operated switch .This is an electrically operated switch . The coil current can be ON or OFF so relays The coil current can be ON or OFF so relays

have two switch positions and most have have two switch positions and most have double throw double throw

Current flowing through the coil of the relay Current flowing through the coil of the relay creates a magnetic field which attracts a lever creates a magnetic field which attracts a lever and changes the switch contacts.and changes the switch contacts.

These allow one circuit to switch a second These allow one circuit to switch a second circuit which can be completely separate from circuit which can be completely separate from first.first.

These are designed fort PCB mounting but we These are designed fort PCB mounting but we can solder wires directly to the pins providing can solder wires directly to the pins providing you take care to avoid melting the plastic case you take care to avoid melting the plastic case of the relay .of the relay .

AdvantagesAdvantages

A manual battery charger can fry our A manual battery charger can fry our batteries by not shutting off when the batteries by not shutting off when the battery is charged up where as this battery is charged up where as this battery charger will never get overcharged battery charger will never get overcharged with an auto turn off battery charger.with an auto turn off battery charger.

This charger provides the full life This charger provides the full life expectancy out of the batteries we expectancy out of the batteries we purchase.purchase.

Easy to use.Easy to use. Simple circuit.Simple circuit. Components are easily available and low Components are easily available and low

cost.cost. User friendly product.User friendly product.

ApplicationsApplicationsThis battery charger is This battery charger is intended to charger any intended to charger any battery ranging from 0 to 15V. battery ranging from 0 to 15V. Some of the applications areSome of the applications are

Rechargeable CellsRechargeable Cells

Motorcycle BatteriesMotorcycle Batteries

Car BatteriesCar Batteries

Mobile phone chargerMobile phone charger

ConclusionConclusion

In this report we explained the methodology In this report we explained the methodology to charge any battery ranging from 0 to 15V. to charge any battery ranging from 0 to 15V. Using this system when the battery is Using this system when the battery is charged fully it will shut off automatically. charged fully it will shut off automatically.

The circuit consists of very less components The circuit consists of very less components and simple in design. Think of the many ways and simple in design. Think of the many ways that we can use an auto turn-off battery that we can use an auto turn-off battery charger in our life.charger in our life.

Whether we have marine batteries, Whether we have marine batteries, motorcycle batteries, car batteries or other motorcycle batteries, car batteries or other sources of electricity that need to be charged sources of electricity that need to be charged up, we can count on quality auto turn-off up, we can count on quality auto turn-off battery charges to add many years of life battery charges to add many years of life through the cycling cycles.through the cycling cycles.

Thank you Thank you