These 7 inverter circuits may look simple with their designs, but are able to produce a reasonably high power output and an efficiency of around 75%. Learn how to build this cheap mini inverter and power small 220V or 120V appliances such as drill machines, LED lamps, CFL lamps, hair dryers, mobile chargers, etc through a 12V 7 Ah battery.
What is a Simple Inverter
An inverter which uses minimum number of components for converting a 12 V DC to 230 V AC is called a simple inverter. A 12 V lead acid battery is the most standard form of battery which is used for operating such inverters.
Let's begin with the most simplest in the list which utilizes a couple of 2N3055 transistors and some resistors.
1) Simple Inverter Circuit using Cross Coupled Transistors
The article deals with the construction details of a mini inverter. Read to know regrading the construction procedure of a basic inverter which can provide reasonably good power output and yet is very affordable and sleek.
There may be a huge number of inverter circuits available over the internet and electronic magazines. But these circuits are often very complicated and hi-end type of inverters.
Thus we are left with no choice but just to wonder how to build power inverters that can be not only easy to build but also low cost and highly efficient in its work.
Well your search for such a circuit ends here. The circuit of an inverter described here is perhaps the smallest as far its component count goes yet is powerful enough to fulfill most of your requirements.
Construction Procedure
To begin with, first make sure to have proper heatsinks for the two 2N3055 transistors. It can be fabricated in the following manner:
Cut two sheets of aluminum of 6/4 inches each.
Bend one end of the sheet as shown in the diagram. Drill appropriate sized holes on to the bends so that it can be firmly clamped to the metal cabinet.
If you find it difficult to make this heat sink you can simply purchase it from your local electronic shop shown below:
Also drill holes for fitting of the power transistors. The holes are 3mm in diameter, TO-3 type of package size.
Fix the transistors tightly on to the heatsinks with the help of nuts and bolts.
Connect the resistors in a cross-coupled manner directly to the leads of the transistors as per the circuit diagram.
Now join the heatsink, transistor, resistor assembly to the secondary winding of the transformer.
Fix the whole circuit assembly along with the transformer inside a sturdy, well ventilated metal enclosure.
Fit the output and input sockets, fuse holders, etc. externally to the cabinet and connect them appropriately to the circuit assembly.
Once the above heatsink installation is over, you simply need to interconnect a few high watt resistors and the 2N3055 (on heatsink) with the selected transformer as given in the following diagram.
Complete Wiring Layout
After the above wiring is completed, it's time to hook it up with a 12V 7Ah battery, with a 60 watt lamp attached at the secondary transformer. When switched ON the result would be an instant illumination of the load with an astonishing brightness.
Here the key element is the transformer, make sure the transformer is genuinely rated at 5 amp, otherwise you may find the output power a lot less than the expectation.
I can tell this from my experience, I built this unit twice, once when I was in college, and the second time recently in the year 2015. Although I was more experienced during the recent venture I could not get the awesome power that I had acquired from my previous unit. The reason was simple, the previous transformer was a robust custom built 9-0-9V 5 amp transformer, compared to the new one in which I had used probably a falsely rated 5 amp, which was actually only 3 amp with its output.
These 7 inverter circuits may look simple with their designs, but are able to produce a reasonably high power output and an efficiency of around 75%. Learn how to build this cheap mini inverter and power small 220V or 120V appliances such as drill machines, LED lamps, CFL lamps, hair dryers, mobile chargers, etc through a 12V 7 Ah battery.
What is a Simple Inverter
An inverter which uses minimum number of components for converting a 12 V DC to 230 V AC is called a simple inverter. A 12 V lead acid battery is the most standard form of battery which is used for operating such inverters.
Let's begin with the most simplest in the list which utilizes a couple of 2N3055 transistors and some resistors.
1) Simple Inverter Circuit using Cross Coupled Transistors
The article deals with the construction details of a mini inverter. Read to know regrading the construction procedure of a basic inverter which can provide reasonably good power output and yet is very affordable and sleek.
There may be a huge number of inverter circuits available over the internet and electronic magazines. But these circuits are often very complicated and hi-end type of inverters.
Thus we are left with no choice but just to wonder how to build power inverters that can be not only easy to build but also low cost and highly efficient in its work.
Well your search for such a circuit ends here. The circuit of an inverter described here is perhaps the smallest as far its component count goes yet is powerful enough to fulfill most of your requirements.
Construction Procedure
To begin with, first make sure to have proper heatsinks for the two 2N3055 transistors. It can be fabricated in the following manner:
Cut two sheets of aluminum of 6/4 inches each.
Bend one end of the sheet as shown in the diagram. Drill appropriate sized holes on to the bends so that it can be firmly clamped to the metal cabinet.
If you find it difficult to make this heat sink you can simply purchase it from your local electronic shop shown below:
Also drill holes for fitting of the power transistors. The holes are 3mm in diameter, TO-3 type of package size.
Fix the transistors tightly on to the heatsinks with the help of nuts and bolts.
Connect the resistors in a cross-coupled manner directly to the leads of the transistors as per the circuit diagram.
Now join the heatsink, transistor, resistor assembly to the secondary winding of the transformer.
Fix the whole circuit assembly along with the transformer inside a sturdy, well ventilated metal enclosure.
Fit the output and input sockets, fuse holders, etc. externally to the cabinet and connect them appropriately to the circuit assembly.
Once the above heatsink installation is over, you simply need to interconnect a few high watt resistors and the 2N3055 (on heatsink) with the selected transformer as given in the following diagram.
Complete Wiring Layout
After the above wiring is completed, it's time to hook it up with a 12V 7Ah battery, with a 60 watt lamp attached at the secondary transformer. When switched ON the result would be an instant illumination of the load with an astonishing brightness.
Here the key element is the transformer, make sure the transformer is genuinely rated at 5 amp, otherwise you may find the output power a lot less than the expectation.
I can tell this from my experience, I built this unit twice, once when I was in college, and the second time recently in the year 2015. Although I was more experienced during the recent venture I could not get the awesome power that I had acquired from my previous unit. The reason was simple, the previous transformer was a robust custom built 9-0-9V 5 amp transformer, compared to the new one in which I had used probably a falsely rated 5 amp, which was actually only 3 amp with its output.
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