Broken Charger Connection Alarm

Detects if a device is not properly connected to its supply Suitable for battery chargers, portable appliance supplies etc.

The above circuit can be useful to detect if the load of any battery charger or plug-in adapter supply is not properly connected. The load can be a set of batteries to be charged or any other type of battery or low dc voltage operated device. The circuit can safely operate over a 3 to 15V range and 1A max. Current, provided the supply voltage is about one volt higher than the voltage required by the load.

The circuit is inserted between the supply and the load; therefore, until a trickle-charging current of at least 100µA is flowing towards the load, D1 and D2 will conduct. The forward voltage drop (about 1V) available across the Diodes drives Q2 into conduction and, consequently, Q1 will be cut-off. If no appreciable load is connected across the circuits output, Q2 will become cut-off, Q1 will conduct and the Piezo-sounder will beep.

Circuit diagram:

Broken Charger Connection Alarm Circuit Diagram

Parts	Description
R1	10K
R2	1K
R3	1K
Q1	BC557
Q2	BC557
D1	1N4007
D2	1N4007
D3	Red LED
BZ1	Piezo Sounder

Notes:

• An optional LED and its series limiting resistor can be wired in parallel to BZ1, as shown in dotted lines in the circuit diagram.
• In this case you may omit the Piezo-sounder in order to obtain a visual alert only.

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Battery Charger Using LTC4078

Using the LTC4078 standalone linear charger circuit you can design a very simple single-cell battery charger circuit for Li-Ion Li-Polymer battery . This LTC4078 battery charger circuit works from both wall adapter and USB inputs. This charger can detect power at the inputs and automatically select the appropriate power source for charging.

Battery Charger Using LTC4078 Circuit diagram

As you can see in the circuit diagram , this Li-Ion Li-Polymer charger requires few external components and you will need to apply just few equations ,to design a full work USB , wall adapter charger .
The charge current can be programmed up to 950mA from wall adapter input . IUSB pin is used for program the charge current for USB power that can be programmed by connecting a resistor to the ground.

The voltage on this pin can be used to measure the battery current delivered from the USB input using the following formula: IBAT = (VIUSB/RIUSB)*1000 . ITERM pin is the termination current threshold program that is set by connecting a resistor to ground. ITERMINATE is set by the following formula:
ITERMINATE =100V/RITERM ; RITERM =100V/ITERMINATE IDC pin is used for program the charge current for wall adapter power that is set by connecting a resistor to ground.The voltage on this pin can be used to measure the battery current delivered from the DC input using the following formula: IBAT = (VIDC/RIDC)*1000 .

The charge current delivered to the battery from the wall adapter or USB supply is programmed using a single resistor from the IDC or IUSB pin to ground and can be calculated using the following equations:
RIDC =1000V/ICHRG-DC , ICHRG-DC = 1000V/RIDC - Wall adapter
RIUSB =1000V/ICHRG-USB , ICHRG-USB =1000V/RIUSB – USB port.

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Simple Car Battery Charger

This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter.To charge a battery just connect the + and - terminals of the circuit to the corresponding terminals of the battery.When the battery is not charged, the ammeter reading shows 1-3 amps.When the battery is fully charged the ammeter reads Zero or nearly zero, after which the battery should be removed from the charger.

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Battery Charger with Temeperature Sensor

Battery with a LM35 temperature sensor on the charger used to monitor the battery temperature is in charge. Battery temperature sensor is needed because the battery temperature will rise at the time in charge. Battery temperature sensor LM35 temperature sensor has high accuracy in monitoring the battery temperature, it is because the temperature sensor LM35 is a temperature sensor that can convert temperature changes into voltage changes linearly.

At the time of the charge a battery will experience changes in temperature, where the battery temperature will begin to rise when the battery began to fill. To avoid over heat the battery, the battery temperature sensor LM35 temperature sensor is required to terminate the battery charging current to avoid overheating.

Battery charger with temperature sensor schematic

On the battery charger circuit temperature sensor with temperature sensor 35 lm above the R1 is used for setting the maximum value of the desired temperature. Therefore, when the temperature was in-charge the battery begins to rise and reach temperatures setup then this series will break the current battery charge.

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Car Battery 12v Charger

The usual chargers of battery automotive, are simple and cheap appliances that charge continuously the battery, with a rythm of few amperes, for the time where the appliance is ON. If the holder do not close in time the charger, the battery will overcharge and her electrolytic faculty are lost with evaporation or likely exists destruction of her elements. The charger of circuit exceeds these faults. It checks electronic the situation of charge of battery and it has circuit of control with retroaction, that forces the battery charge with biggest rythm until charge completely.

Car Battery 12v Charger Circuit diaram:

When charge completely, it turns on one RED led (LD2). The charger has been drawn in order to charge batteries of 12V, ONLY. What should watch it from what it manufactures the circuit, they are the cables that connect the transformer with the circuit and in the continuity the battery, should they are big cross-section, so that heat when it passes from in them the current of charge and also they do not cause fall of voltage at the way of current through them.

Adjustment
After assembling of the circuit, adjust TR1 to null value, power-up and make the following adjustments :-

1. Without connecting the battery check that the 2 LED?s are turned on.
2. Connect a car battery to the circuit and check that LD2 is OFF and a current (normally 2A to 4A) is flowing to the battery.
3. Adjust TR1 until LD2 turns ON and the charge current is cut.
4. Adjust TR1 to null value and charge the battery using the hydrometer technique (if you do not have or do not know how to use a hydrometer, then use a good condition battery and charge).

Carefully adjust TR1 so that LD2 begins to turn ON and the charge current falls to a few hundred milliamps (mA). If TR1 is set correctly then in the next round of charging you will noticed LD2 begin to flicker as the battery is being charged. When battery is completely charged, LD2 turns ON completely.TR1 does not need further adjustment anymore. Q1 is connected in line with the battery and is fired by R3, R4 and LD2. The R2, C1, TR1 and D2 sense the voltage of the battery terminal and activate Q2 when the voltage of the battery terminal exceeds the value predetermined by TR1.

When an uncharged battery is connected, the terminal voltage is low. Under this circumstance, Q2 is turned OFF and Q1 is fired in each half cycle by R3, R4 and LD2. The Q1 functions as a simple rectifier and charges the battery. If the battery terminal voltage is increased above the level that had been fixed by TR1, then Q2 shifts the control of Q1 gate. This deactivates Q1 and cuts off the current supply to the battery and turns LD2 ON indicating that the charge has been completed. Q1 and bridge rectifier GR1 should be mounted on heatsinks to prevent overheating. M1 is a 5A DC ammeter to measure the charge current.

Source : http://www.ecircuitslab.com/2012/01/car-battery-12v-charger.html

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Simple Ni Cad Battery Charger

This simple charger circuit uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base-emitter voltage of the transistor and the forward voltage drop across the diodes are relatively stable. The charging current is approximately 15mA or 45mA with the switch closed. This suits most 1.5V and 9V rechargeable batteries.


The principle work of the charger is between one batteries with other battery dissociated by packer wall which there is in battery box, mean every space at battery doesnt correlate in consequence electrolyte fluid at every battery nor correlates (partition wall between batteries there shall no which leak).

In one batteries there is arrangement of plate that is some plates for positive pole (between plates dissociated by timber, ebonite or plastics, depends on technology applied) and some plates for negativity pole. Active agent from positive plate made from chocolate tin oxide (PbO2) while active agent from negativity plate is tin (Lead) pore (like sponge). The plates soaked by electrolyte fluid that is sulfate acid (H2SO4).

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Sec Exciter Powered HV Capacitor Charger Circuit From Steven Chiverton

My friend Steven has updated a few more of his findings related to his sec exciter experiment, lets learn more what Mr. Steven has to say.

NEW SEC EXCITER POWERED HV CAP CHARGER WITH HV DC OUTPUT

Heres the newest circuit  originally it was  a 3 peace circuit i found on YouTube  so i modified it and upgraded it and threw in some ideas to get this beauty , now it has the tip3055 and inductor as on the YouTube video,  and a ac light but you can see all the changes Ive done to it to make it suitable to power off the single rf output of the sec exciter tower  and i threw in the microwave cap  look carefully the inductor has 2 coils one runs through the collector of the tranny and back to above the second av plug diodes i used in the modified circuit so for all i can say its acting as an rf antennae to and opposite to the other coil so if theres any induction going on  then maybe it explains why i get a fast voltage reading till it gets to 454 volts dc then stays there  and as for the current output well its high enough to zap you and i had some problems in measuring the current output so i may have to get it done by using a regulator circuit  so i can get a steady reading , but Im sure its high enough as when the cap seems to charge and output the dc voltage  it sure zaps you when you touch the hv outputs , so this is not bad for a sec exciter powered hv cap charger , i threw in the hand wound bifilar wound joule thief toroid to and all diodes which are 1n60 germanium and the inductor has 120 on top of it it was from my parts draws which i have collected parts from old TVs etc , so when i fire my sec exciter up and connect the single RF output to this circuit it doesnt take long to  charge up  so i have to do some more tests and experiments and see what else i can get out of this , so add this to the circuits that use microwave caps as the only other ones are microwave oven circuits , so my collection of new ideas and circuits i modify to be powered from a single output from an sec exciter grows  more and more.

Here are the pics of another newer sec exciter powered hv dc output circuit,  this one puts out more voltage than the other 2 similar circuits and it exceeds the 1100 volts ac rating of the microwave cap even though its dc and the current well up to 13 set to amps on a clamp meter i have top be sure i read it right but it sure gives a shock,

Here are 7 new pictures of the first out of 3 news sec exciters completed, the series coils have their taps running to a printed circuit board under the coil , these taps are for testing the coil to insure continuity through all the coils . tap number 5 runs to the new circuit via a plug at the top wall this last tap is the power coil tap where all the power comes out of and goes into the hv, dc,  ,ac and rf booster or amp section its outputs run to the terminals on the side  the driver circuit and its switch are at the front end where the input starts at no 1. the series center core goes inside a pvc pipe and it slides in and out for tuning purposes through the center of the series coils  you can see the pvc pipe sticking out each end , that is the sliding flux concentrating core  housing pipe

Ive done a test of the newest sec exciter coil tower etc etc first the transistors didnt come on and oscillate so that was easy to fix by bridging a metal,  object from one transistor to the other . take note of the power transistors they are used as heat sinks for the bd139 transistors so they have no legs  so i bridged the metal object across them both to kick start the transistors into oscillation, when i did that i felt no output at the hv circuit till i inserted the core which i borrowed from my other sec exciter series coil tower projects,   then i held a neon by one leg above each of the series coil sections and the neon lit up well and from a good range to but some spots the neon was less brighter , so i move the flux concentrating core out till the neon started to get brighter , i then new that the flux concentrating core was working in tuning the sec exciter for maximum output,  as the neon would get brighter near some of the coil sections and the last coil which is the power coil it got bright there to when i pulled the core out so far and that was when the hv dc, hv ac, and RF booster kicked in and gave the high outputs  so it all worked , Ive swapped the feed backs over since the first test as it sometimes helps in the transistors oscillation  without having to kick start them,    

       

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