Tuesday, January 7, 2014

555 timer IC Inverter 12V to 220V

1 comment:
This article explains What is inverter? And how can you construct your own simple low cost 12V to 220V inverter circuit. An inverter is nothing but a DC to AC converter. Inverters are very useful electronics products for compensating emergency power failure, as it performs DC to AC conversion.
AC can’t be stored for future use but DC can be stored for future use in a battery. The stored DC can be converted back to AC by using power inverters.
Here is the simple inverter circuit diagram using 555 timer IC. The astable multivibrator mode operation of 555 timer utilized here for AC oscillations and these oscillations are switched via transistor 2SC4029 to a transformer. The transformer step ups the voltage to 220V AC. Use a 12V battery and Battery charger circuit for this project. Design of inverter circuit is also given. 

Circuit diagram of DC to AC inverter

Components required

  1. Power supply (12V)
  2. Resistors (3kΩ x 2; 1kΩ, 2W x 1)
  3. Capacitor (10µF)
  4. 555 timer IC
  5. Diode(1N4007)
  6. Transistor (2SC4029)
  7. 9V to 220V Step up transformer

Working of DC to AC inverter

  • This is a simple inverter circuit based on 555 timer IC. Here timer IC wired as an astable multivibrator mode.
  • The diode 1N4007 is used to get 50% duty cycle for the pulses from 555, it also reduces the design complexity.
  • The output pulse from the 555 astable multivibrator is fed to the base of power transistor 2N5192. The 2N5192 transistor works as a switch, so the 12V DC supply passed through the transformer at a rate of 50 times per second.
  • Transformer step up the 12V to 220V, thus we got 50Hz, 220VAC supply at the output of transformer secondary.

Design of Inverter circuit

555 timer Astable designed about to oscillate at 50Hz, line frequency.
Frequency of astable multivibrator is given by,
Choose C=10µF, then
Use R1=R=3kΩ 


******Related Topic ******

Simple Inverter

No comments:
Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends on which tansistors you use for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts. 
C1, C2    2              68 uf, 25 V Tantalum Capacitor  
R1, R2    2              10 Ohm, 5 Watt Resistor              
R3, R4    2              180 Ohm, 1 Watt Resistor            
D1, D2   2              HEP 154 Silicon Diode    
Q1, Q2  2              2N3055 NPN Transistor (see "Notes")    
T1           1              24V, Center Tapped Transformer (see "Notes")               
MISC     1              Wire, Case, Receptical (For Output)         

  1. Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1,Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power.
  2. The easiest and least expensive way to get a large T1 is to re-wind an old microwave transformer. These transformers are rated at about 1KW and are perfect. Go to a local TV repair shop and dig through the dumpster until you get the largest microwave you can find. The bigger the microwave the bigger transformer. Remove the transformer, being careful not to touch the large high voltage capacitor that might still be charged. If you want, you can test the transformer, but they are usually still good. Now, remove the old 2000 V secondary, being careful not to damage the primary. Leave the primary in tact. Now, wind on 12 turns of wire, twist a loop (center tap), and wind on 12 more turns. The guage of the wire will depend on how much current you plan to have the transformer supply. Enamel covered magnet wire works great for this. Now secure the windings with tape. Thats all there is to it. Remember to use high current transistors for Q1 and Q2. The 2N3055's in the parts list can only handle 15 amps each.
  3. Remember, when operating at high wattages, this circuit draws huge amounts of current. Don't let your battery go dead :-).
  4. Since this project produces 120 VAC, you must include a fuse and build the project in a case.
  5. You must use tantalum capacitors for C1 and C2. Regular electrolytics will overheat and explode. And yes, 68uF is the correct value. There are no substitutions.
  6. This circuit can be tricky to get going. Differences in transformers, transistors, parts substitutions or anything else not on this page may cause it to not function.
  7. If you want to make 220/240 VAC instead of 120 VAC, you need a transformer with a 220/240 primary (used as the secondary in this circuit as the transformer is backwards) instead of the 120V unit specified here. The rest of the circuit stays the same. But it takes twice the current at 12V to produce 240V as it does 120V. 
  8. Electronics Lab Created By Muhammad Irfan