Modify 600Va UPS to an Inverter (12V to AC Conversion) - Upgraded version with cooler fan auto switching

-

 


  • First step you need to remove the buzzer otherwise it will keep making noise and irritating when you are using for long hours.

Identify the buzzer and remove it safely using soldering iron and Desolder Sucker. Please refer this article which i already covered for using soldering iron and Desolder Sucker.  https://sajeetronics.blogspot.com/2021/05/soldering-basics-and-smd-soldering-on.html




 

  • Replace the 7 or 9 Amp Battery (Originally came with the UPS) with a CAR battery

  • Connect Car battery + and - with the UPS Battery terminal + and -





Now UPS will start produce AC voltage from AC out put terminals. But using this solution for long hours is not recommended Because MOS-FET and Transformer gets heat when it's started DC to AC conversion Process. Normal UPS is designed to Use for 15-20 min only so if you need long hours you need a proper ventilation system inside the UPS. 

Fixing a cooler fan

To achieve that we need to Fix a cooler fan. But i have seen in the most of the solutions provided in the internet they have connected the 12V cooler fan directly in the 12 V Battery input line. Issue here is fan will be always working when the battery and the UPS connected. This also will drain your battery unnecessarily even UPS is in ON or OFF state. Also this will reduce the life of your cooler fan Because your battery will be always connected to your UPS and it will be working all the time.

Solution 1 : ON The Fan when UPS POWER switch on only


For this we need a 12v LED driver unit you can get  this for 300 Rs in SL market.


Connection Diagram :


Now the fan will turn on only when UPS is triggered to ON state. But here also i see an issue Normally people keep the UPS on forever because it's a standby power supply. Cooler fan will be turn on even when UPS is running on Direct Current.

So i prefer cooler fan is required to turn on only when UPS is running only with the battery backup mode not when charging or working with direct current. That way we can save some energy and Cooler fan life.

Solution 2 : Modify the circuit to Turn ON the cooler fan When UPS in on Battery Backup Mode only

we need this 12V Relay module, 7805 voltage regulator, 0.22uf and 0.1uf capacitors.

Wiring Diagram : 


We have now powered the relay module and Connected the LED driver power switching via the relay module. Now when a signal coming to the relay only it will turn ON and turn ON the Cooler fan via the LED Driver.
 
Oki now we need a signal for this relay module to turn on the fan when UPS is running on Battery mode. 

How to detect the UPS is running on battery mode ?


Can you see there are 3 LEB bulbs on the UPS surface for indicating the mode ?

So the yellow LED bulb will be indicating for battery mode. Now let's modify the above circuit to take signal to the Relay module from the battery mode LED indicator.

Wiring diagram : 













 

 





Comments

Post a Comment

Popular posts from this blog

LCD/LED TV FLASH BIOS / EPROM programming with Serial Flash Memory - W25Q32FV

-
Image
The Winbond 25Q32 is a really cool part : high capacity (32 MBytes), very fast, good support for many standard instructions, supports wide bus modes... But it can be expensive depending on the application. Winbond 25Q32 is commonly used flash memory in the LED/LCD Tv's. Electricians in Sri Lanka call this with the different names such as  FLASH IC PROGRAMMABLE IC BIOS IC EEPROM IC EMMC IC SPI IC There are different series of IC's available in the market i'll mention few here 24 Series  25 Series  29 Series  Electricians mostly call this 24 Series only as Flash IC and the 25 series IC's called as EPROM/ SPI IC.  25 series is the one commonly used for LED or LCD TV's. SPI stands "Serial peripheral Interface" Serial peripheral means electronic device which can operate out of the microcontroller and which supports microcontroller functions. Also this is called as EPROM means "Erasable Programmable Read Only Memory". you can programme this with a bina
Read more

Sony Bravia 55" Double image / Image Flickering ( CKV - Clock Vertical Signal ) LED Panel Repairing

-
Image
Double Image fault solution through CKV, CKVB and STVP Signal Cutting. What is Ckv CKVB STVP in LCD TV?  Pulse-pulse CKV, CKVB, STVP used as pulse “Row driver” or also called “Gate – driver”. … What is CKV in LED TV?  The CKV signal detection circuit comprises a first LED, a second LED, a first light sensor, a second light sensor and a judging module. A node between the first LED and the second LED is used for receiving CKV signals output by the control panel. What is pair a signal ? Pair signals mean after the level shifter section we will get the separate output like CKV 1 , CKVB 1 and STV 1. before entering to Gate Driver IC [ COF ] these three signals are synchronizing each other its called signal paring. depending on COF ic this pair will be increase or decrease. example single COF IC is available in scalar board single pair signal only available (ckv 1,ckvb 1, stv 1) ckv is a positive pulse and ckvb is a generally negative pulse. CKV SIGNAL Other Names  COG, Gate driver and Panel
Read more

Calculate RPM with Hall effect Sensor

-
Image
How does it work? The Hall Effect sensor works on the principle of Hall Effect. According to which, whenever a magnetic field is applied in a direction perpendicular to the flow of electric current in a conductor, a potential difference is induced. This voltage can thus be used to detect whether the sensor is in the proximity of a magnet or not. The arduino can detect this voltage change through its interrupt pin and determine whether the magnet is near the sensor or not. The basic working of the Arduino hall effect sensor can be described as shown: Hall effect sensors have three pins: VCC(5V), GND and Vout(Signal). The pin out of a hall effect sensor is as shown above. Step 1: Connections for the Arduino Hall Effect Sensor Interfacing the hall effect sensor with Arduino is really simple. The VCC of the sensor is connected to Arduino’s 5V power pin. The GND of the sensor is connected to the GND pin of Arduino. And the Vout or Signal pin of the hall effect sensor is
Read more