Device charger Kedr AUTO 4A is intended for charging and restoring the performance of 12-volt acid lead batteries, partially lost as a result of sulfation and oxidation of the electrodes, as well as training them through charge-discharge cycles in order to increase their resource, service life and storage.

The Kedr AUTO 4A device provides automatic shutdown when charging is complete in the “AUTOMATIC” mode. The device is equipped with a dial indicator (ammeter) and a light indicator, which: when the “AUTOMATIC” mode is turned on, does not light up; when the charge is complete in the “AUTOMATIC” mode - flashes; When the “CYCLE” mode is turned on, it glows evenly.

The KEDR-AUTO device provides an accelerated charging mode for a completely discharged (up to 10 V) battery at a compromise initial current value of 3 - 4 A. Moreover, after 1 - 2 hours (depending on the degree of battery discharge and network voltage), the value of the charging current decreases to a value of about 2 A and continues to decrease towards the end of the charge to 1 A or less. This mode eliminates significant heating of the battery during charging and reduces the charging time of a completely discharged battery to 3 - 6 hours.

Before you start using the device, you must study the rules for the care and use of rechargeable batteries.

General characteristics devices
Model	Kedr-Auto 4A
Rated supply voltage, V	220
Network frequency, Hz	50
Rated voltage of the battery being charged, V	12
Charging current, A (max.)	4 A
Rated power consumption, W	85
Relative air humidity, no more	98% at 25°C
Atmospheric pressure, kPa	from 84 to 106
Dimensions	185x130x90
Equipment
Product	1 PC.
Passport	1 PC.
Instructions	1 PC.
Package	1 PC.
Suitable for batteries
Type of battery being charged
Chargeable battery capacity	30 - 75 A/h

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SAFETY REQUIREMENTS

ATTENTION! Before working with the Kedr-auto charger, you must carefully study these operating instructions.

Be careful! The charger contains dangerous voltage.
Before replacing the fuse or carrying out repairs, disconnect the charger from the mains.
Do not use a homemade fuse; this may damage the device.
Do not charge batteries near stoves or radiators (at a distance of less than 1 meter).
The ventilation openings in the device casing must not be covered.

Prohibited:
- disassemble the device body and operate the charger with the top cover removed;
- operate the charger if the power cord is damaged;
- operate in conditions of high humidity, as well as in aggressive environments;
- operate the device near sources of open fire or other sources of thermal radiation;
- operate the charger with the ventilation holes closed. The battery charging process should be carried out in a well-ventilated area.

Preparation for work and work procedure

Before you start using the device, you must study the rules for the care and use of rechargeable batteries.
Open the cover on the back of the charger and remove the cords. Set the automatic switch to the “CHARGE” position.
The charge mode toggle switch “CONTINUOUS-CYCLIC” allows you to select battery charging modes.
If it is necessary to charge the battery, switch the charge mode toggle switch to the “CONTINUOUS” position.
If it is necessary to form or desulfate the plates, when the battery capacity decreases, switch the charge mode selection toggle switch to “CYCLIC”. Connect a load (12V 6 W light bulb) to the battery terminals.
Connect, observing polarity, the cord using clamps to the battery.
Electronic protection of the Kedr-M device from short circuits and incorrect polarity connections is designed in such a way that charging current appears at the output only if a voltage source is connected to the output terminals ( accumulator battery) voltage of at least 10V.
The light bulb connected to the terminals of the charger will not light up, since it is not a voltage source.

Operation in battery charging mode.

Switching between the operating modes of the device “CONTINUOUS-CYCLIC” and “CHARGE-RECHARGE” can be done while charging the battery without disconnecting it from the network.
Connect the 220 V power cord plug, and the process of charging the battery begins, as evidenced by the ammeter readings.
The charging current of a completely discharged battery at the beginning of charging can be 4 A or more; further in the charging process the current will decrease.
When the battery reaches full charge, the charger automatically turns off, as indicated by the glow of the “END OF CHARGE” LED.
Switch the automatic switch on in the “RECHARGE” mode and continue charging the battery. The battery is considered fully charged if the electrolyte density does not change for two hours during charging.
In cyclic charging mode, after every 45 seconds of charging, the battery is discharged for 15 seconds through a load (light bulb) connected to the battery.
In the “CYCLIC” or “RECHARGE” position, the automation is turned off.

Possible malfunctions and methods for eliminating them

Despite the fact that the charger is simple and reliable to use, in practice there are cases when consumers, due to improper use, cannot obtain the required charging current and mistakenly consider this to be a malfunction of the charger. These errors are summarized in the table.

Name of faults, external manifestation and additional symptoms	Probable Cause	Elimination method	Note
1. When connecting the charger to the battery, there is no charging current reading	1. The fuse has blown. 2. Poor contact between the output terminals “+” and “-” and the terminals of the battery. 3. The polarity is reversed when connecting the charger to the AB conclusions. 4. The output terminals “+” and “-” are connected to each other. 5. Short circuit in the battery or it is over-discharged (voltage on it is less than 4 V)	1. Replace the fuse. 2. Check the condition of the terminals. If necessary, clean them. 3. Check that the device and battery are connected correctly. 4. Open the clamps. 5*. Check the device and battery.	* In case of other faults, the memory must be repaired.
2. When connecting the charger to the battery, the ammeter needle shows more than 5 A.	1. The battery is faulty (one bank is short-circuited). 2. The mains voltage is significantly higher than normal.	1. Disconnect the device, eliminate the battery or network fault.	* If the charger is working properly, the fault must be looked for in the battery being charged
3. The charger has turned off, but the battery is significantly undercharged.	1. Malfunction of the battery (sulfation of plates, density does not correspond to the norm, contamination, etc.)	1. Charge in the “Cyclic”, “Recharge” mode.	Test the charger with a known good battery.

The use of reliable chargers is one of the main conditions for stable and long-term operation of a car battery. The Kedr charger has earned the trust of a large number of users. Easy to use and multifunctional, this inexpensive automated charger is in steady demand among experienced drivers and novice motorists.

Characteristics of the Kedr-Auto 4A charger

- Rated supply voltage, V 220

- Network frequency, Hz 50

- Rated voltage of the battery being charged, V 12

- Charging current, A (max.) 4 A

- Rated power consumption, W 85

Fundamental electrical diagram ASU

Printed circuit board and ASU connection

If you can’t buy it, you can easily assemble it yourself. Which is what I did. I used imported transistors VS556b (pnp) and bc337-40 (npn) instead of KT315 and KT361. The photo shows the factory charger board and my homemade one.

Factory boardautomatic charger

Homemadeboard assembly

I assembled this device, checked it - it works great, I like it. This charger has:

- automatic mode

- desulfate mode

- constant charge mode (to full capacity)

- protection against incorrect connection and short circuit.

- in cyclic mode, after 45 seconds of charging, 15 seconds of discharging follow.

It will be useful to make a small improvement to the memory. Complete disconnection from the 220V network at the end of the charge, so to speak, for every fireman. Disconnecting the Kedr-M charger from the network when the LED lights up " end of charging" can be performed on a triac or relay. The command to turn on/off can be taken from the collector of transistor VT1, adding another transistor turned on in key mode, and using it to switch the power to the relay winding or the current through the LED of the optocoupler that controls the triac. The circuit was assembled and tested: vovcanchin.

Discuss the article AUTOMATIC CHARGER DIAGRAM

To extend the life of your car starter battery, regular maintenance is required. One of the mandatory items is maintaining a normal charge level. This is especially true for winter operation, since due to the large number of powerful consumers and severe frosts, the car’s standard voltage relay is not able to fully charge the battery.

Contents

Device overview

The charger is made in a small plastic case (185x130x90 mm). The low power of the device determined its light weight.

On the front panel there are:

• Pointer ammeter for monitoring charge current;
• LED indicator of operating mode;
• Mode switch “Cycle - Automatic”.

A power cord and wires with terminals for connecting the battery come out from the back of the device.

Technical characteristics of the device Kedr Auto 4a

This charger provides a charge current of up to 4 A. This is quite enough to maintain the capacity of not completely discharged batteries. Other technical characteristics:

WET batteries are standard lead-acid batteries with liquid electrolyte. Do not try to charge an AGM, EFB or GEL battery with this charger.

The charger kit includes instructions for use, which detail the procedure for operating and possible malfunctions with the order of their elimination.

Features of the device and for which batteries it is suitable

The automatic charger is designed to charge lead-acid batteries with a capacity of 40 to 75 A/h.

Important! The larger the battery capacity, the longer it will take to charge. Moreover, many manufacturers recommend setting the charge current equal to 1/10 of its capacity. Therefore, this device is not recommended for regular charging of high-power batteries with a high degree of discharge.

The device has built-in protection against incorrect switching on - polarity reversal. There is no output voltage and charging current in the following cases:

• Incorrectly connected battery;
• High degree of discharge (voltage at the battery terminals is less than 10 V);
• No battery.

Kedr Auto 4a has two operating modes - “automatic” and “cycle”. Each operating mode uses its own charging algorithm.

The operation indicator light has the following modes:

• Extinguished – “Automatic” mode;
• Flashing – in “Automatic” mode the charge is complete;
• Continuous light – “Cycle” mode is on.

Machine

This mode is the main one and is designed to charge batteries without user intervention. The logic of operation is such that when a discharged battery is connected, the device begins to output maximum current, which decreases as the charging process progresses. When the voltage at the battery terminals reaches 13.2 V, the charge automatically stops.

Important! The initial current depends on the degree of discharge of the battery, but does not exceed 4A in the most extreme case.

Cycle

The mode is designed to restore batteries with signs of sulfation. In cyclic mode, the charge alternates with a short-term discharge with a low current, which promotes the dissolution of large sulfate crystals in the active mass of the plates.

How to charge the battery using Kedr Auto 4a

Usage automatic device simplifies battery maintenance as much as possible and allows it to be performed regularly without significant time investment.

Procedure:

• Connect the battery to the output terminals of the device;
• Connect the device to the power supply;
• By pressing the button on the front panel, select the required operating mode.

Important! In the case of desulfation ("Cycle" mode), it is necessary to connect a load in parallel to the output terminals - a 12 V 6 W car lamp, through which a training discharge of the battery will be carried out.

Using a more powerful lamp will increase the discharge current, resulting in longer charging times. A weak load, on the contrary, will not give the desired effect.

During the charging process, it is necessary to control the density of the electrolyte. The absence of an increase in density with an undercharged battery indicates that desulfation is necessary.

Electrical circuit diagram

Do you have a charger? Kedr Auto 4a? Then tell us in the comments which one and your impressions of it, this will greatly help other car enthusiasts and make the material more complete and accurate

Charger Kedr-Auto 4A: abstract. Charger for car batteries

Every car owner should have a car battery charger in their arsenal. Operation of the vehicle without of this device can become significantly more complicated. A more useful car charger may be in winter time years, when the battery has to be charged much more often. When the battery is completely discharged, you will have to “light” the car, which is not always comfortable, and in some cases may require additional expenses due to the charge of 100. It is much easier to charge the battery at home. One of the most popular brands of car chargers is “Kedr” - devices of this brand are purchased by many vehicle owners.

Model range of chargers: Kedr-M

The Kedr-Auto charger is intended for recharging car batteries. Such equipment is mainly used to restore the functionality of batteries that have lost it due to sulfation reactions and oxidation of the electrodes. In addition, you can also increase the service life using the Kedr-Auto Mini charger as a means of training the charge-discharge cycle.

Device functions

• Automatically stops battery charging.
• A repeating charge-discharge operating mode, the action of which is aimed at restoring the battery capacity as a result of the sulfation reaction of the plates.
• Protection system against small short circuits and incorrectly connected clamps.
• The provided recharging mode allows you to reach the full capacity of the battery.

Preparing for work

On the back of the charger there is a special compartment in which cords with clips and a network cable are hidden.

The voltage of the Kedr-Auto 4A charger can harm human health or become a prerequisite for a fatal outcome. The device must be turned off before restoration and repair work and changing the fuse. Installing homemade fuses and blocking the housing ventilation holes is strictly prohibited. In addition, do not charge the battery near heating devices.

Before work, cords with terminals are removed from the rear compartment of the device. The 1st lever of the device is switched to charge mode, the 2nd to repeating or continuous mode.

How to use Kedr-Auto 4A?

Continuous mode is used in this case if real charging of the battery is required.

The repeating mode is used when molding or desulfating electrodes. In this mode, a 6-watt, 12-volt light bulb is connected to the terminals.

Then the terminals are connected to the current terminals, observing polarity.

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cedar Auto 10A has 3 battery charging modes.

Review: Kedr auto 10A – Automatic charger device.

ATTENTION! You CANNOT start your car engine using this device!

The Kedr-Auto 12V charger has the following technical characteristics:

• The nominal value of the batteries charged using the device is 12 V.
• Supply voltage - 220 V.
• Maximum power consumption - 85 A.
• Current strength - up to 4 A.

Charger "Kedr-Auto 10"

This model is an improved version of the previous charger - “Kedr-Auto 4A”, which was created in 2008. The device is used to charge a 12-volt battery.

Distinctive features of Kedr-Auto 10

• Improved protection against short circuits, overloads and incorrect terminal connections.
• Using only high-quality and modern components.
• Pre-start mode, in which the battery is charged with a current of 10 amperes. After this there is an automatic transition charger into battery charging mode with a current of 4 amperes.
• The main charging stage is replaced by a recharging mode with a current of 0.5 amperes. This mode allows you to avoid overcharging and restore the battery to full charge.
• Battery desulfation can be carried out in a cycle.
• The rated current in automatic charging mode is 4 A.
• Light weight charger- only 600 grams.
• Manufacturer's warranty - 1 year.
• If you follow the instructions for the Kedr-Auto 4A and Kedr-Auto 10 chargers, the service life is 5 years.

Main characteristics of Kedr-Auto 10

• Relatively small dimensions - 185 x 130 x 90 millimeters.
• Pre-start mode, the current in which is 10 amperes.
• Rated current is 4 amperes.
• The power consumption of the device is 250 watts.
• The charger allows you to charge batteries with a maximum rating of 12 volts.
• The charger operates from a standard 220 V network.

The battery charging time varies depending on its capacity and degree of discharge. The microprocessor built into the charger controls charging and pre-start mode. All modes are turned on and the device is activated after the device is switched to automatic mode. First, an increased charging current is supplied, after which its strength is reduced to the nominal value, which allows you to significantly speed up the battery charging process.

Operation process " Cedar-Auto 4A"

The instructions for the Kedr-Auto 4A charger describe in detail the process of using the device and charging the battery. It is impossible to disable the memory, since the protection system protects it from damage even if the terminals were initially connected incorrectly.

Auto mode

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Restoring a full battery charge is carried out as follows:

• The charger terminals are connected with correct polarity.
• The “Automatic” charging mode is turned on.
• The plug is connected to the 220 V network.
• The charging process will be interrupted by the device automatically after reaching the maximum charge level, which will be notified by the blinking indicator.

Cyclic mode

In the cycle, the battery is charged to full capacity as follows:

• A 12-volt car light bulb is connected to the battery terminals. It is advisable to select a light bulb with a power of 6 watts.
• The terminals are connected with correct polarity.
• The corresponding button starts the “Cycle” mode. In this mode, the charge indicator lights up constantly.
• The charger is connected to the power supply. This mode does not imply automatic shutdown, accordingly, the cycle of discharge and charge can be repeated endlessly. For this reason, the user must independently monitor the charging battery.

Before the actual process of charging the battery, the plugs are removed from the cans. After completion of charging or restoration, the terminals are disconnected only after the charger is disconnected from the 220 V network.

ZU Kedr: user reviews

Most reviews left for Kedr chargers are positive. The most popular model of the device is “Kedr-Auto 4A”. Somewhat less often you can find reviews of the Kedr-Auto 10 model.

Among the advantages of the charger, car enthusiasts include simplicity and ease of operation, the low price of “Kedr-Auto” (about 1500-2500 rubles) and a long service life. Users often note that the charger device can last ten years or more without complaints. For many users, one of the main benefits is the cycling mode, as it allows you to desulfate and bring old batteries back to life. Car enthusiasts often note that with the help this mode It was possible to restore the functionality of the batteries, which had been completely discharged for a long time. Of course, it is impossible to completely restore the battery capacity, but a positive effect can be achieved.

However, you may encounter negative reviews. Some owners of Kedr-Auto chargers note that the battery does not charge in automatic mode. If the battery capacity exceeds 60 Ah, then charging it takes a very long time due to the 4 ampere limit. The same rechargeable batteries, whose capacity exceeds 70 Ah, are not fully charged. Users also noted that Kedr-Auto chargers do not charge batteries whose charge has dropped below 10 volts.

Despite all the negative reviews and existing shortcomings, Kedr-Auto chargers are one of the best and most popular on the automotive market. Devices allow you to quickly charge rechargeable batteries, differ long term operation and wide functionality and are significantly ahead of their competitors of other brands.

Review of chargers for car batteries of the Kedr series

Any car owner should have in his arsenal a charger for a 12 V car battery. You simply cannot do without it when operating your car. If you are a novice car enthusiast and have not yet purchased a battery charger, then you will definitely come to this. This is especially important in winter, when you need to charge the battery more often than usual. IN otherwise you may find yourself in a car with a “dead” battery and will have to “light it”. You can, of course, charge the battery at a service station. But these are unnecessary expenses and wasted time. It is easier to charge the battery in the garage or at home. You just need to choose the right charger. In this article we will talk about chargers for Kedr car batteries. Let's consider different models and read what people say in reviews.

"Kedr-M"

This charger (charger) is designed for charging car batteries. The device is also designed to restore the performance of batteries, which they have lost as a result of oxidation and sulfation of the electrodes. In addition, the charger can be used for charge-discharge training to increase service life.

Main features of the device:

• Disabling the charging process in automatic mode;
• There is a cyclic mode of operation (charge-discharge) to restore lost capacity as a result of sulfation of the plates;
• Protection against incorrect connection of clamps to current terminals and against short circuits;
• There is a recharging mode designed to bring the battery to full capacity.

The network cable, as well as cords with clamps, are located in a special compartment with reverse side devices.

Note! The Kedr-M charger has a voltage that is life-threatening. Always before repair work and changing the fuse, turn off the device. It is strictly forbidden to use homemade fuses and cover the holes in the housing provided for ventilation. In addition, it is prohibited to charge the battery closer than one meter to heating devices, stoves, etc.

The table below shows the main parameters of the Kedr-M device.

Characteristics	Meaning
Characteristics	Meaning
Power supply voltage, V	220
Chargeable battery rating, V	12
Charge current, A	up to 4
Power consumption, watt	up to 85
Duration of pulse charging current in cyclic mode, sec	from 15 to 75
Duration of pulse discharge current in cyclic mode, sec	from 5 to 25
Permissible temperature environment, WITH	from 10 to 40
Permissible air humidity, %	98 (at 25 C)
Permissible atmospheric,	84 kPa

In order to prepare Kedr-M for work, open the rear compartment and remove the cords with terminals. Set the first toggle switch to charge mode, and the second select continuous or cyclic mode. Continuous is recommended when you need to charge the battery. The cyclic mode is used when desulfating or forming electrodes. In this case, you need to connect a 12 volt light bulb with a power of 6 watts to the terminals. Next, observing the polarity, connect the terminals to the current terminals.

It is worth noting here that the Kedr-M charger has protection against short circuits and incorrect connection. The device will only work if a battery with a voltage of 10 volts or more is connected to the terminals. That is, it will not charge a deeply discharged battery, going into protection.

While the charger is operating, you can switch modes without disconnecting the device from the 220 volt network. If the battery is discharged, the charging current will initially be 4 amperes, and then will constantly decrease. Once the battery is fully charged, the charger will turn off and the LED will blink, indicating the end of the process. After this, you can set the Kedr-M to recharging mode.

In cyclic mode, the battery is charged for approximately 45 seconds and then discharged via a connected light bulb. In this mode there is no automatic shutdown and the process must be controlled independently.

Below you can see two versions of the circuit diagram of the Kedr-M car battery charger.

In the table below you can see the designation of the elements on the circuit diagram.

Chargers "Kedr-Auto 4A" and "Kedr-Auto 12V"

This charger model is designed for charging and restoring 12-volt lead-acid batteries and conducting charge-charge training cycles.

The power cords and connections to the battery come out of the back of the device. Unlike the Kedr-M model, there is no compartment for laying wires. The procedure for using the Kedr-Auto 4A charger will be shown below in the “How to use?” section. The table below shows the main characteristics of these models.

Below is a schematic diagram of “Kedr-Auto 4A” and “Kedr-Auto 12B”.

In the table you can see a list of elements indicated on the circuit diagram.

The photo below shows a printed circuit board for the manufacture of “Kedr-Auto 4A” and “Kedr-Auto 12B”.

This is an improved version of the Kedr-Auto 4A charger, which was released in 2008. The manufacturer reports that the charger is designed for charging 12-volt lead-acid batteries.

What are the differences between the improved model?

• Improved protection against incorrect connection of terminals, short circuit and overload;
• During assembly, modern transformers and other components are used;
• Added pre-launch mode (“afterburner”). In this mode, the battery is charged with a current of 10 amperes. After this, the charger automatically switches to charging mode with a current of 4 amperes;
• After completing the main charging stage, Kedr-Auto-10 automatically switches the device to recharging with a current of 0.5 amperes. This ensures the most complete charge of the battery and eliminates overcharging.;
• Possibility to carry out desulfation in a cycle;
• In automatic charge mode, the rated current is 4 A;
• Service life from 5 years if the operating instructions are followed;
• The weight of the charger is only 600 grams;
• Warranty ─ 1 year.

The main characteristics of Kedr-Auto-10 can be seen below:

• Dimensions are 185 by 130 by 90 millimeters;
• Pre-start mode with charging current up to 10 amperes;
• Rated charging current 4 amperes;
• Power consumption is up to 250 watts;
• The nominal value of the batteries being charged is 12 volts;
• The charger operates from a 220 volt network.

Charging time depends on the degree of discharge of the battery and its capacity. The Kedr-Auto-10 charger has a microprocessor that controls charging. Including pre-launch mode. All this is done when the device is switched to automatic mode. First, an increased charge current is supplied, which is then reduced to the nominal value. This speeds up the charging process.