Showing posts with label battery. Show all posts
Showing posts with label battery. Show all posts
Wednesday, November 19, 2014
Alkaline battery charger
Alkaline Battery Charger series is special used for alkaline battery charger. Alkaline Battery Charger With this series of alkaline batteries that have been drop (1.3 V) to the Rev back to 1.6 V. LEDs on the circuit this Alkaline Battery Charger will flash during charging process, and will be extinguished when the battery is full. The series also features Alkaline Battery Charger for 9V battery charger. VR 47 Ohm serves to regulate the battery charging current.
Alkaline Battery Charger series on utilizing each side beat AC signal from travo to perform the charging process, which is controlled using a 4 pieces set as the rectifier diodes. In mencharger battere with this series should often be controlled, because this circuit is not equipped with overcharge protection, especially for small-size battery.
Saturday, November 8, 2014
Automatic Battery Charger
Normally, chargers available in the market do not have any sort of control except for a ro-tary switch that can select different tap-pings on a rheostat, to vary the charging current. This type of control is not adequate because of the irregular fluctuations in the mains supply, rendering the control ineffective. A simple circuit intended for automatic charging of lead-acid batteries is presented here. It is flexible enough to be used for large capacity inverter batteries. Only the rating of transformer and power transistor needs to be increased.
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Circuit diagram :
Automatic Battery Charger Circuit Diagram
The circuit has been basically designed for a car battery (about 40 Ah rating), which could be used for lighting two 40W tube lights. The circuit includes Schmitt trigger relay driver,float charger,and battery voltage monitor sections. The Schmitt trigger is incorporated to avoid relay chattering. It is designed for a window of about 1V. During charging, when the battery voltage increases be-yond 13.64V, the relay cuts off and the float charging section continues to work. When battery voltage goes below 11.66V, the relay is turned on and direct (fast) charging of the battery takes place at around 3A. In the Schmitt trigger circuit, resistors R1 and R2 are used as a simple voltage divider (divide-by-2) to provide battery voltage sample to the inverting input terminal of IC1. The non-invert-ing input terminal of IC1 is used for reference input derived from the output of IC2 (7806), using the potentiometer arrangement of resistors R3 (18 kilo-ohm) and R4 (1 kilo-ohm).
LED1 is connected across relay to indicate fast charging mode. Diodes D3 and D6 in the common leads of IC2 and IC3 respectively provide added protecion to the regulators. The float charging section, comprising regulator 7812, transistors T3 and T4, and few other discrete components, becomes active when the battery volt-age goes above 13.64V (such that the relay RL1 is deenergised). In the energised state of the relay, the emitter and collector of transistor T4 remain shorted, and hence the float charger is ineffective and direct charging of battery takes place.
The reference terminal of regulator (IC3) is kept at 3.9V using LED2, LED3, and diode D6 in the common lead of IC3 to obtain the required regulated output (15.9V), in excess of its rated output, which is needed for proper operation of the circuit. This output voltage is fed to the base of transistor T3 (BC548), which along with transistor T4 (2N3055) forms a Darlington pair. You get 14.5V output at the emitter of transistor T4, but because of a drop in diode D7 you effectively get 13.8V at the positive terminal of the battery. When Schmitt trigger switches ‘on’ relay RL1, charging is at high current rate (boost mode). The fast charging path, starting from transformer X2, comprises diode D5, N/O contacts of relay RL1, and diode D7.
The circuit built around IC4 and IC5 is the voltage monitoring section that provides visual display of battery voltage level in bar graph like fashion. Regulator 7805 is used for generating reference voltage. Preset VR1 (20 kilo-ohm) can be used to adjust voltage levels as indicated in the circuit. Here also a pot meter arrangement using resistors R7, R8, and R9 is used as ‘divide by 3’ circuit to sample the battery voltage. When voltage is below 10V, the buzzer sounds to indicate that the safe dis-charge limit has been exceeded.
Thursday, November 6, 2014
Battery powered Headphone Amplifier
Some lovers of High Fidelity headphone listening prefer the use of battery powered headphone amplifiers, not only for portable units but also for home "table" applications. This design is intended to fulfil their needs and its topology is derived from the Portable Headphone Amplifier featuring an NPN/PNP compound pair emitter follower output stage.
An improved output driving capability is gained by making this a push-pull Class-B arrangement. Output power can reach 100mW RMS into a 16 Ohm load at 6V supply with low standing and mean current consumption, allowing long battery duration. The single voltage gain stage allows the easy implementation of a shunt-feedback circuitry giving excellent frequency stability.
An improved output driving capability is gained by making this a push-pull Class-B arrangement. Output power can reach 100mW RMS into a 16 Ohm load at 6V supply with low standing and mean current consumption, allowing long battery duration. The single voltage gain stage allows the easy implementation of a shunt-feedback circuitry giving excellent frequency stability.
Battery-powered Headphone Amplifier Circuit Diagram:
- For a Stereo version of this circuit, all parts must be doubled except P1, SW1, J2 and B1.
- Before setting quiescent current rotate the volume control P1 to the minimum, Trimmer R6 to maximum resistance and Trimmer R3 to about the middle of its travel.
- Connect a suitable headphone set or, better, a 33 Ohm 1/2W resistor to the amplifier output.
- Switch on the supply and measure the battery voltage with a Multimeter set to about 10Vdc fsd.
- Connect the Multimeter across the positive end of C4 and the negative ground.
- Rotate R3 in order to read on the Multimeter display exactly half of the battery voltage previously measured.
- Switch off the supply, disconnect the Multimeter and reconnect it, set to measure about 10mA fsd, in series to the positive supply of the amplifier.
- Switch on the supply and rotate R6 slowly until a reading of about 3mA is displayed.
- Check again the voltage at the positive end of C4 and readjust R3 if necessary.
- Wait about 15 minutes, watch if the current is varying and readjust if necessary.
- Those lucky enough to reach an oscilloscope and a 1KHz sine wave generator, can drive the amplifier to the maximum output power and adjust R3 in order to obtain a symmetrical clipping of the sine wave displayed.
Output power (1KHz sinewave):
16 Ohm: 100mW RMS
32 Ohm: 60mW RMS
64 Ohm: 35mW RMS
100 Ohm: 22.5mW RMS
300 Ohm: 8.5mW RMS
Sensitivity:
160mV input for 1V RMS output into 32 Ohm load (31mW)
200mV input for 1.27V RMS output into 32 Ohm load (50mW)
Frequency response @ 1V RMS:
flat from 45Hz to 20KHz, -1dB @ 35Hz, -2dB @ 24Hz
Total harmonic distortion into 16 Ohm load @ 1KHz:
1V RMS (62mW) 0.015% 1.27V RMS (onset of clipping, 100mW) 0.04%
Total harmonic distortion into 16 Ohm load @ 10KHz:
1V RMS (62mW) 0.05% 1.27V RMS (onset of clipping, 100mW) 0.1%
Unconditionally stable on capacitive loads
Saturday, October 18, 2014
12 Volt Battery Guardian Circuit
Dont get caught with a flat battery; this easy-to-build circuit can cut off the power to a 12V fridge or car stereo system if the battery voltages drops below critical level. Electric fridges in vans and 4WDs are a great idea but if you are not careful, they can severely discharge the battery and leave you stranded. Maybe the battery will end up with severe damage as well. The same problem applies if you have a big stereo system and you like to play it without the motor running.
Main features:
- Cuts power to load (eg, fridge) when battery voltage drops below a preset level.
- 10A rating.
- Low power drain.
- Chirping sound during cut-out.
- Flashing LED indication during cut-out.
- Automatically reconnects power when battery recharged.
Parts layout:
PCB layout:
Circuit diagram:
Source: Silicon Chip 6 May 2002
Friday, October 17, 2014
12v Battery Charger Circuit
The circuit may be accustomed charge 12V lead acid batteries.
Overview
Overview
Pin one of the LM317 IC is that the management pin that is employed to manage the charging voltage, Pin a pair of is that the output at that the charging voltage seems, Pin three is that the input to that the regulated DC offer is given.
The charging voltage and current is controlled by the electronic transistor (Q1), electrical device (R1) and POT (VR1). once the battery is 1st connected to the charging terminals, the present through R1 will increase. This successively will increase the present and voltage from LM317. once the battery is totally charged the charger reduces the charging current and also the battery are charged within the trickle charging mode.
The charging voltage and current is controlled by the electronic transistor (Q1), electrical device (R1) and POT (VR1). once the battery is 1st connected to the charging terminals, the present through R1 will increase. This successively will increase the present and voltage from LM317. once the battery is totally charged the charger reduces the charging current and also the battery are charged within the trickle charging mode.
Circuit
Notes
- The input voltage to the circuit should be a minimum of 3V more than the expected output voltage. luminous flux unit 317 dissipates around 3V throughout its operation. Here I used 18V DC because the input.
- The charging voltage may be set by victimization the POT (VR1).
- The luminous flux unit 317 should be mounted on a sink.
- All capacitors should be rated a minimum of 25V.
- Youll be able to use crocodilian clips for connecting the battery to the charger.
Sunday, October 5, 2014
Universal Battery Charger Circuit
Universal Battery Charger Circuit Part List:
R1 = 120R-0...5W
R2 = See Diagram
C1 = 220uF-35V
D1 = 1N4007
D2 = 3mm. LED
Q1 = BD135
J1 = DC Input Socket
This is circuit diagram of a low cost universal charger for NiCD - NiMH batteries. This circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This one can be used to charge cellular phone, toys, portables, video batteries, MP3 players, ... and has selectable charge current. An LED is located in circuit to indicate charging. Can be built on a general purpose PCB or a veroboard.
Saturday, October 4, 2014
3 6 Volt Cell Phone Battery Meter
This is a agnate ambit to the aloft and provides a 4 LED bar blueprint advertence the voltage of a accepted 3.6 volt Lithium – Ion recharable corpuscle buzz battery. The advertence voltage is provided by a TL431 programmable voltage antecedent which is set to 3.9 volts area the TL431 connects to the 1K resistor. The lower advertence for the LED at pin 14 is set with the 5K adjustable resistor.
The programmed voltage of the TL431 is formed out with a voltage affiliate (10K 5.6K). The acclimation terminal or alliance of the two resistors is consistently 2.5 volts. So, if we use a 10K resistor from the acclimation terminal to ground, the resistor accepted will be 2.5/10000 = 250uA. This aforementioned accepted flows through the high resistor (5.6K) and produces a voltage bead of .00025 * 5600 = 1.4 volts. So the blow adapted achievement voltage at the cathode of the TL431 will be 2.5 + 1.4, or 3.9 volts.
Working out the LED voltages, there are three 390 ohm resistors in alternation with addition adjustable (5K) resistor at the bottom. Assuming the basal resistor is set to 2K ohms, the absolute attrition is 390+390+390+2000 = 3170 ohms. So, the resistor accepted is the advertence voltage (3.9) disconnected by the absolute resistance, or about 3.9/ (390 + 390 + 390 + 2000) equals 1.23 mA. This gives us about .00123*2000= 2.46 volts for the basal LED, and about .00123*390 = .48 volts for anniversary footfall aloft the bottom. So, the LEDs should ablaze at accomplish of 2.46, 2.94, 3.42, and 3.9. A absolutely answerable corpuscle buzz array is about 4.2 volts. You can acclimatize the 5.6K resistor to set the top voltage college or lower, and acclimatize the lower 5K resistor to set the basal LED for the everyman voltage. But you do charge a 6 to 12 volt or greater array to ability the circuit.
Friday, September 26, 2014
How to Charge a Lead Acid Battery Circuit Diagram
- Batteries should not be discharged below 1.8 volts per cell, as it can cause permanent damage to the cells.
- A 40 ampere-hour battery when discharged at 4—ampere rate will take 40/ 4, i.e. 10 hours to be completely discharged. Suppose the same battery is discharged at 10—amperes rate. Theoretically, it should take 40/ 10, i.e. 4 hours to get fully discharged. But in practice it 1S observed that the battery will get fully discharged within about 3% hours itself In other words, the higher the discharge rate, the lesser will become the capacity of the battery.
- A fully discharged battery needs to be charged about 1% times its full ‘capacity’, to reach a fully charged, state. In other words, a 40-AH battery being charged at 4 amperes rate will take 15 hours and not 10 hours to be fully charged Charging a partially discharged battery =· It is not possible to estimate the time needed to charge a partially discharged battery.
- The charging or discharging of a battery is ideal at 10 hours rate, which means that a 40 ampere hour battery is to be charged or discharged at 40/ 10, i.e. 4-ampere rate.
- Lead—acid battery has a voltage of 2.1 volts per cell (on load) when fully charged, which will rise up to 2.7 volts per cell while on charge. When the voltage per cell (on load) drops to 1.8 volts, the battery is considered to be fully discharged.
- However, the battery may be charged till such time as the following are observed: (a) Free gassing of the cells. (b) Battery voltage reaches its maximum value, and remains steady. (c) The specific gravity of the electrolyte (as measured by a hydrometer) reaches 1.240
- That’s why is engine starting, when the battery drains 200 to 300 amperes, the battery becomes dead’ within a few seconds of use.
Tuesday, September 23, 2014
12V Battery Charger for Sealed Lead Acid
12V Battery Charger for Sealed Lead Acid
There are a number of points we need to cover about the care and use of Sealed Lead Acid batteries.
Firstly, these batteries must be charged, discharged and stored very carefully.
We normally think batteries can be stored for months (if not years) and they will be available for immediate use.
This is not the case with SLA batteries.
If you store a NEW, full charged SLA battery for 6 months or more, you will find it may be fully discharged.
You may also find you cannot charge it!! It may be worthless.
Thats how delicate SLA batteries are.
They must be charged on a regular basis to prevent them discharging to a very low voltage level.
If the terminal voltage of a SLA battery is allowed to go below 8v, aprocess called SULPHATION starts to cover the surface of the plates and prevents the battery being re-charged. The internal resistance of the battery increases and it becomes useless. See products Sealed Lead Acid Battery Charger on Amazon
Parts List of SLA Battery Charger
2 - 1R8 0.5watt resistors
1 - 150R 0.25 watt resistor
1 - 180R
1 - 560R
1 - 1k5
3 - 2k2
1 - 3k3
1 - 4k7
1 - 8k2
1 - 1k mini trim pot
1 - 1n ceramic
2 - 47u 25v electrolytics
1 - 5mm red LED
4 - 1N4148 signal diodes
1 - 10v 0.25watt zener
1 - BC 547 transistor
2 - BC557 transistors
1 - MCR100-6 SCR
1 - 1m red lead
1 - 1m black lead
2 - alligator clips
1 - 2m very fine solder
1 - SLA Battery Charger PCB
Also required:
1 - 12v AC transformer (500mA AC)
1 - power lead
1 - case
Monday, September 1, 2014
A Car Battery Monitor Wiring diagram Schematic
A close call on the road can really focus your mind on the importance of having a battery monitor in a car. I had been enjoying a pleasant week of travelling around the countryside at a leisurely pace and taking in the beautiful scenery each day. It wasnt until the final day, with the big rush to return home, that I had to drive at night.My home is deep in the country and on the road I was travelling the closest petrol station may be 80km away. I was travelling through an area that is full of open-cut coal mines and large heavily loaded semi-trailers constantly pound the roads, travelling at quite high speeds. It was around 8pm at night and everything was very dark no street lights or house lights anywhere.
Just as I was going up a hill, the lights began to dim and the engine coughed. A large semi-trailer loomed in the rear-vision mirror as I pushed the clutch in and tried to restart. My speed was falling rapidly and my lights were blacked out - I was like a sitting duck in the middle of the road, as the semi-trailer came rapidly bearing down on me. I just managed to pull the car off the road, as the semi-trailer came screaming past, missing me by inches! After calling for assistance from the NRMA, the problem was found to be a fault in the alternator, which was failing to charge the battery. The battery voltage had been falling under the heavy load of the lights and at the worst possible time, there was not sufficient power for the lights or the motor.
After the initial shock wore off, I put on my thinking cap to come up with a PIC-based solution to the problem. What was really needed was a display and a buzzer, to get my attention should the voltage fall outside a specified range. So my design criteria was set, a series of LEDs could indicate the voltage and a buzzer would also be used to warn of problems.
Main Features:
- Visual indication of battery voltage
- Audible warning when voltage becomes low
- Screw terminals for easy connection
- Simple and easy to build
Circuit details:
The schema is based on PIC16F819 18-pin microcontroller which has an analog-to-digital (A/D) input to monitor the battery voltage and outputs capable of driving LEDs directly, to keep the component count down. There are seven LEDs in all, giving a good range of voltage indication. The topmost LED, LED1, comes on for voltages above 14V which will occur when the battery is fully charged. LED2 indicates for voltages between 13.5V and 14V while LED3 indicates between 13V and 13.5V. Normally, one of these LEDs will be on. LED4 covers 12.5V to 13V while LED5 covers 12V to 12.5V. LED6 covers from 11.5V to 12V while LED7 comes on for voltages below 11.5V. These two LEDs are backed up by the piezo chime which beeps for voltages between 11.5V and 12V and becomes more insistent for voltages below 11.5V.
That might seem fairly conservative. After all, most cars will start with no troubles, even though the battery voltage might be a touch below 12V, wont they? Well, no. Some modern cars will happily crank the motor at voltages below 11V but their engine management will not let the motor start unless the voltage is above 11V. So dont think that a modern car will always start reliably. This little battery monitor could easily prevent a very inconvenient failure to start! So lets describe the rest of the schema. The incoming supply is connected via diode D1 which provides protection against reverse polarity while zener diode ZD1 provides protection from spike voltages.
A standard 7805 3-terminal regulator is then used to provide a stable 5V to the microcontroller. The battery voltage is sensed via a voltage divider using 33kΩ and 100kΩ resistors. This brings the voltage down to within the 0-5V range for the A/D input of the PIC16F819. Port B (RB0 to RB7) of the microcontroller is then used to drive the various LEDs, with current limiting provided via the 330Ω resistor network. RB7, pin 13, drives a switching transistor for the piezo buzzer.
Software:
The schema is based on PIC16F819 18-pin microcontroller which has an analog-to-digital (A/D) input to monitor the battery voltage and outputs capable of driving LEDs directly, to keep the component count down. There are seven LEDs in all, giving a good range of voltage indication. The topmost LED, LED1, comes on for voltages above 14V which will occur when the battery is fully charged. LED2 indicates for voltages between 13.5V and 14V while LED3 indicates between 13V and 13.5V. Normally, one of these LEDs will be on. LED4 covers 12.5V to 13V while LED5 covers 12V to 12.5V. LED6 covers from 11.5V to 12V while LED7 comes on for voltages below 11.5V. These two LEDs are backed up by the piezo chime which beeps for voltages between 11.5V and 12V and becomes more insistent for voltages below 11.5V.
That might seem fairly conservative. After all, most cars will start with no troubles, even though the battery voltage might be a touch below 12V, wont they? Well, no. Some modern cars will happily crank the motor at voltages below 11V but their engine management will not let the motor start unless the voltage is above 11V. So dont think that a modern car will always start reliably. This little battery monitor could easily prevent a very inconvenient failure to start! So lets describe the rest of the schema. The incoming supply is connected via diode D1 which provides protection against reverse polarity while zener diode ZD1 provides protection from spike voltages.
A standard 7805 3-terminal regulator is then used to provide a stable 5V to the microcontroller. The battery voltage is sensed via a voltage divider using 33kΩ and 100kΩ resistors. This brings the voltage down to within the 0-5V range for the A/D input of the PIC16F819. Port B (RB0 to RB7) of the microcontroller is then used to drive the various LEDs, with current limiting provided via the 330Ω resistor network. RB7, pin 13, drives a switching transistor for the piezo buzzer.
Software:
For the software, the design follows the basic template for a PIC microcontroller. Port A and its ADC (analog-to-digital converter) function are set up while port B functions as the output for the LEDs and buzzer. Once the set-up is complete, a reading will be taken at port RA2, the input for the A/D convertor. This reading is then compared with a series of values to determine the range of the voltage. This is similar to a series of "if" statements in Basic language. If the voltage is found to be within a certain range, the relevant port B pin will be turned on. If the voltage is below 12V, the buzzer will be turned on for a brief period, to signal a low battery condition. As the voltage falls below 11.5V, the frequency of the beeps will increase, to signal increased urgency.
Building it:
All the parts are mounted on a small PC board measuring 46 x 46mm (available from Futurlec). The starting point should be the IC socket for the PIC16F819, as this is easiest to mount while the board is bare. The next item can be the PC terminal block. The resistors and capacitors can then follow. Make sure the electrolytics are inserted with correct polarity.
Make sure that you do not confuse the zener (ZD1) with the diode when you are installing them; the diode is the larger package of the two.
All the parts are mounted on a small PC board measuring 46 x 46mm (available from Futurlec). The starting point should be the IC socket for the PIC16F819, as this is easiest to mount while the board is bare. The next item can be the PC terminal block. The resistors and capacitors can then follow. Make sure the electrolytics are inserted with correct polarity.
Make sure that you do not confuse the zener (ZD1) with the diode when you are installing them; the diode is the larger package of the two.Even more important, dont get the 78L05 3-terminal regulator and the 2N3906 transistor mixed up; they come in identical packages. The 78L05 will be labelled as such while the 2N3906 will be labelled "3906". And make sure you insert them the correct way around. The buzzer must also be installed with the correct polarity. The 330Ω current limiting resistors are all in a 10-pin in-line package. There are four green LEDs, two yellow and one red. They need to be installed in line and with the correct orientation.
Testing:
Before you insert the PIC16F819 microcontroller, do a voltage check. Connect a 12V source and check for the presence of 5V between pins 14 & 5 OF IC1. If 5V is not present, check the polarity of regulator REG1 and the polarity of the diode D1. If these tests are OK, insert the IC and test the unit over a range of voltage between 9V and 15V. Make sure that all LEDs come on in sequence and the piezo buzzer beeps for voltages below 12V.
Now it is matter of installing the unit in your car. It is preferable to install the unit in a visible position for the driver. However, it should not obscure any other instruments. The unit should be connected to the cars 12V supply after the ignition switch. This will turn the unit off with the other instruments and prevent battery drain while the motor is not running.
Author :Alan Bonnard
Saturday, August 30, 2014
USB Mobile Phone Battery Charger Circuit
USB Mobile Phone Battery Charger Circuit
This simple ambit can accord adapted 4.7 volts for charging a adaptable phone. USB aperture can accord 5 volts DC at 100mA accepted which is acceptable for the apathetic charging of adaptable phones. Most of the Adaptable Buzz batteries are rated 3.6 volts at 1000 to 1300 mAh. These array packs accept 3 NiMh or Lithium beef accepting 1.2 volt rating. Usually the array backpack requires 4.5 volts at 300-500 mA accepted for fast charging.
But low accepted charging is bigger to access the ability of the battery. The ambit declared actuality provides 4.7 adapted voltage and acceptable accepted for the apathetic charging of the adaptable phone. Transistor Q1 is acclimated to accord the adapted output. Any average ability NPN transistor like CL100, BD139, TIP122 can be used. Zener diode D2 controls the achievement voltage and D1 protects the polarity of the achievement supply. Front end of the ambit should be affiliated to a A blazon USB plug.
Connect a red wire to pin1 and atramentous wire to pin 4 of the bung for accessible polarity identification. Affix the achievement to a acceptable charger pin to affix it with the adaptable phone. After accumulating the schema, admit the USB bung into the atrium and admeasurement the achievement from the schema. If the achievement is OK and polarity is correct, affix it with the adaptable phone.
via
But low accepted charging is bigger to access the ability of the battery. The ambit declared actuality provides 4.7 adapted voltage and acceptable accepted for the apathetic charging of the adaptable phone. Transistor Q1 is acclimated to accord the adapted output. Any average ability NPN transistor like CL100, BD139, TIP122 can be used. Zener diode D2 controls the achievement voltage and D1 protects the polarity of the achievement supply. Front end of the ambit should be affiliated to a A blazon USB plug.
Connect a red wire to pin1 and atramentous wire to pin 4 of the bung for accessible polarity identification. Affix the achievement to a acceptable charger pin to affix it with the adaptable phone. After accumulating the schema, admit the USB bung into the atrium and admeasurement the achievement from the schema. If the achievement is OK and polarity is correct, affix it with the adaptable phone.
via
Friday, August 29, 2014
Car battery charger
Given below, is a very simple schema that can be used for charging car batteries. In this schema there is facility for monitoring the charging current and voltage.
The schema is based on the IC MC78T12ABT from Freescale.The IC is nothing but a 7812 in TO-3 package with 3A capacity. The transformer T1 steps the mains voltage to 15V AC and diodes D1&D2 does the job of rectification. Capacitor C1 does the filtering and C2 acts as a decoupling capacitor. The ground terminal of IC1 is lifted to 2.1V using the diodes D3 , D4 and D5 . So the output from the IC1 will be a regulated 14.1V (12+2.1).The battery is charged via diode D6.The D6 blocks reverse flow of current from battery to charging schema when the mains power is not available. Meter M1 shows the charging current and M2 shows the charging voltage.
Notes.
* The transformer T1 can be a 230V primary; 15-0-15V, 3A secondary step down transformer.
* The meter M1 can be a 3A ammeter.
* Meter M2 can be a 20V volt meter.
* Fuse F1 can be a 1A fuse.
Sunday, August 24, 2014
Simple 15V And 5V Car Battery Supply Wiring diagram Schematic
This is a Simple 15V And 5V Car Battery Supply Circuit Diagram. In this schema use IC1 is a switching regulator that generates a 45-kHz signal that drives the gate of MOSFET Ql. Dl, D2, and D3 are Schottky diodes. The 5-V output is sensed as a reference; feedback to the chip turns off the gate signal to Ql if the voltage rises above 5 V.
Tl has Trifilar windings that assume about 2% regulation for a 10-to 100-mA load change on the ± 15-V supplies. R1/D4 provide over-voltage protection. Tl has a primary inductance of about 21 . Core size should allow 4-A peak currents. The turn ratios are IIV2 turns each for the 15-V supplies, ll1/2 turns for the primary, and four turns for the 5-V secondary. The efficiency is about 75%.
Simple 15V And 5V Car Battery Supply Circuit Diagram
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