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[Ideas For Design]
DC-AC inverter targets electroluminescent applications

Contributing Author  |   ED Online ID #6400  |   May 27, 1997


Adc-ac inverter circuit generates the high-voltage ac signal required to drive an electroluminescent (EL) panel. An EL panel is a strip of plastic that’s coated with a phosphorous material. When a highvoltage ac signal, which is at least 40 V or greater, is applied across this panel, it emits light. The brightness of this light depends on the amplitude and frequency of the voltage waveform applied across the panel. As the voltage or frequency of the driving signal increases, the brightness of the lamp increases.

EL panels can be used to backlight LCD displays, keypads, or other types of user interfaces. EL lamps typically consume less power than LEDs, which suits them for backlighting battery-powered products, such as pagers, calculators, cellular phones, and so on.

The circuit shown uses the SP4425 IC along with a few other components to convert a 1.5-V battery supply to a high-voltage square-wave output (see the figure). This squarewave output is applied across the EL panel, causing it to illuminate. The SP4425 IC contains an internal oscillator that drives an internal high-power bipolar junction transistor switch. The oscillator frequency is set by C2, which is 180 pF, and is approximately 22 kHz. The switch is connected between one end of the 470-µH inductor and ground. The other end of the inductor is connected to the battery voltage.

When the switch is turned on, a low impedance path is provided between the inductor and ground. This causes the current flowing through the inductor to increase. As the current through the inductor increases, energy is stored in the inductor in the form of magnetic flux. When the switch is turned off, this stored energy is transferred through a diode (D1) to a 0.1-µF capacitor. This process is repeated continually, causing the voltage across the capacitor to increase with each cycle. For a one square-inch-size lamp, the voltage across C1 will increase to a dc level in the range of 50 to 70 V. This voltage is then fed back into the IC at pin 4.

Within the IC is an internal Hbridge circuit and a frequency divider. The frequency divider divides the oscillator frequency down by a factor of 64. Therefore, the frequency divider’s output is approximately 343 Hz. The H-bridge along with the frequency divider convert the dc voltage at pin 4 into a 343-Hz square wave. The voltage amplitude of this square wave is 50 to 70 V, and is approximately equal to the voltage across C1.

Two complementary square-wave outputs are provided by the IC at pin 5 and pin 6. Both outputs are equal in amplitude, but are 180° out of phase with each other. The EL lamp is connected between these two complementary outputs, resulting in a differential voltage across the lamp that’s twice the amplitude of a single square-wave output. The brightness of the lamp typically can range from 3 to 5 foot-lamberts, depending on the dc resistance of the inductor.

This dc-ac inverter circuit is intended for battery-powered applications, in which the display is only required to be illuminated for short periods of time. Therefore, S1 is connected to pin 8 and is used to enable or disable the circuit. When S1 is closed and pin 8 is pulled up to the supply voltage, the IC is enabled. When S1 is opened, an internal pulldown resistor in the IC causes the voltage at pin 8 to be pulled to ground. This disables the IC and puts the circuit in a low-current standby mode. C3 is used as a decoupling capacitor for the IC supply pin. The supply pin must be sufficiently bypassed because large current transients are drawn from the battery when the circuit is functioning.

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    Reader Comments

    kindly send me the circuit diagram of a 2000w inverter. Also send me an oscillator circuit diagram having two different signals which can switch on the mosfet seperately for the production of alternating current (AC).

    Kemekuzi E. -January 04, 2009

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    Anonymous -January 02, 2009

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    Rating Only -October 25, 2008   (Article Rating: )

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    gbemisola mukaila -June 28, 2008

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    Anonymous -June 26, 2008

    none

    Anonymous -June 26, 2008

    please kindly send to me 12v dc to 220v ac circuit diagram by email for 1000 watts inverter thanks for your kind response.

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    Joseph -June 26, 2008

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    rully -June 22, 2008

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    wajid nazir -June 03, 2008

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    Anonymous -June 01, 2008

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    Anonymous -May 29, 2008

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    Anonymous -May 18, 2008

    aaa

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    pls i need a 1500w inverter diagram with details on how to wound the traformer

    nonso -May 15, 2008

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    zahid mushtaq -May 15, 2008

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    shafqat ali -May 07, 2008

    Hye..dear.. I'm in need to a high power inverter 24V DC to 240V AC which could handle more than 1500W at least.can u give me schematic diagrams in detail.plz send me.thank.

    daus_malaysia -May 06, 2008

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    hussein (el_aqsa@hotmail.com)

    Hussein -May 05, 2008

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    Anonymous -May 05, 2008

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    murtaza -May 03, 2008

    i need a simple circuit diagram for an inverter to convert 12/24volts to 220volts.

    samuel ayoola -April 29, 2008

    Hi, this is Steven I'm in need to a high power inverter 12V DC to 220V AC circuit diagram which could handle more than 1000W at least. I'd be most grateful if you could help me with a non heavy - good design that could do the job. Regards

    steven -April 29, 2008

    Please mail the schematcs for lowpower 10 to 100 watts inverter (12V DC to 200V~300V AC @400hz).

    vikram -April 26, 2008

    I need a powerful and reliable 1000w inverter circuit for my project. Please, I need the type that uses pnp/npn trasister as output

    Buadu -April 24, 2008

    CARI SKEMA

    adi -April 21, 2008

    Please, I need the circuit diagram of the Inverter 24v dc to 220v ac, 1500W, of Wenchi, type WHS-1500W.

    Anonymous -April 14, 2008

    pls, i need the request for Dc to 220V Ac circuit diagram for maximum capacity of 7.5kva for my household use.

    bamidele segun -April 10, 2008

    thank you for that but cold you send me inverter cicuit 24vdcto 220vac diagram

    AZAEL MACHA -April 09, 2008

    i need a simple circuit diagram for an inverter to convert 12/24volts to 220volts.

    SAULA S.A. -April 08, 2008

    Rating Only

    Rating Only -April 03, 2008   (Article Rating: )

    bonjour monsieur je cherhe un convertisseur dc/acde forte puissance allant jusqua 10 kva

    voundai -January 08, 2008

    Anonymous -April 01, 2008

    no

    Anonymous -March 31, 2008

    can u plz asisst me with a cct diagram schematic that I can use for simulation in PSIM.the cct is DC-AC inverter from an input of 12v,24v and an output of 1000 W ,220V ,4A.

    nkuleko s -March 31, 2008

    need a circuit diagram for dc-ac inverter power at 200-300 watts. with choper transformer

    Anonymous -March 29, 2008

    choper 300watt turn for 12 volt dc 220volt ac50 hz

    Anonymous -March 29, 2008

    send me the cicuit diagram of a 1500watts inverter using 24vdc and an output of 240vac

    CHUKS -March 28, 2008

    I want you to show me circuit diagram of a dc to ac inverter with sinewave.

    franklin -March 27, 2008

    ineed an inverter circuit diagram of sg3525 2000watts

    gbenga oloruntoba -March 26, 2008

    Hi everybody! I'm also searching for dc-ac inverter (12VDC or 24VDC input to 220-230AC output). If anybody has already the diagram, can you please share to me too. (lyndie1214@hotmail.com)

    Lyndie of Philippines -March 26, 2008

    hi plz send me 12v dc to 220ac 50/60Hz 2000w full sigin vew inverter diagaram in my mail box thannx

    asif riaz -March 25, 2008

    Please I'll need a circuit diagram for an inverter with the following specifications: 12V DC to 220V AC >=3000W power output,i will appreciate the mail if sent to princebankole@yahoo.com

    bankole -March 24, 2008

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    Kingsley -March 22, 2008

    are there anyone to help me about design a dc-ac converter?If anyone have a circit about this I will wait that mail.. my mail is miller.own@gmail.com see you

    alper -March 20, 2008

    i m making the project of solar inverter.i have not the internal circuit of inverter.so pls send me the required circuit.

    Anonymous -March 14, 2008

    i need a dc12volt\ac230volt converter schematic diagram

    Anonymous -March 13, 2008

    I need to know why the value of voltage are higher for my construction project of a 12v dc power supply.What's the troubleshooting happens

    wan -March 12, 2008

    I need to know why the value of voltage are higher for my construction project of a 12v dc power supply.What's the troubleshooting happens

    wan -March 12, 2008

    I need a complete circuit diagram of 12v(DC)to 220v(ac, power rating of 600 VA inverter with power auto cut. my email id is nitesh_wrcpk@yahoo.com

    nitesh -February 27, 2008

    please i need 3000w output inverter 12vdc to 220VAC50Hz for my project. thanks

    m -February 15, 2008

    please i need 3000w output inverter 12vdc to 220VAC50Hz for my project. thanks

    MNAwan -February 15, 2008

    invter 300w

    apu -February 15, 2008

    I need a circuit diagram for dc to ac inverter from 24vdc to 240vac..can i get as soon as possible..

    faiz -February 14, 2008

    Hi dear DC-AC inverter circuit dragming ok

    altaf ahmad -February 13, 2008

    I need a circuit diagram for dc-ac inverter power at 200-300 watts.

    Parveen -February 12, 2008

    i want to know how to construct inverter to use in taking 2-bedroom flat and also for reading.

    don shashi -February 07, 2008

    HARD TO FIND SOURE OR EXAMPLE OF DC N AC

    MARIA -February 05, 2008

    HARD TO FIND SOURE OR EXAMPLE OF DC N AC

    MARIA -February 05, 2008

    pls help me . i need a dc to ac(10vdc to 220ac 60 hz sin wave 5000w) to complete my project for my engineering electrical branch

    dheeraj -February 04, 2008

    I'm look for a full diagram to make a 3kW inverter. 24v dc(or 48V dc) to 220v ac (50Hz). inverter that can run for 3 hours

    Mark Waudby -February 01, 2008

    Please send me the diagram of a 12v dc to ac inverter diagram of 50-60hz.

    Arslan -January 27, 2008

    pls i nid the diagram on construction of 48volts inverter

    alaga -January 25, 2008

    please i need 3000w inverter 12vdc to 220VAC50Hz for my project thanks

    Anonymous -January 20, 2008

    I need a diagram for a 2500w inverter 12VDC to 220VAC/50Hz. Thanks.

    george100 -January 18, 2008

    Apakah Inverter memerlukan perawatan

    kimberto -January 16, 2008

    hi pls i want a layout diagrame of 5000watts amplifer

    jb -January 15, 2008

    bonjour monsieur je cherhe un convertisseur dc/acde forte puissance allant jusqua 10 kva

    voundai -January 08, 2008

    i Agree

    Abib Hussain -January 07, 2008   (Article Rating: )

    I want you to send a construct of dc ac inverter using 12v input and 220v output

    emmanuel cobbson -December 28, 2007

    I need the diagram and full Details of how to construct DC-AC inverter using 12v input and 220V output

    Duzu AbdulRAHEEM -December 15, 2007

    plaese with honor and respt i request for 12vDC to 220v AC circuit dragramplease kindly send to me now or to my email thanks for assistants pure sine wave inverter 1000wts to 10000wts low cost thank

    saiyu -December 09, 2007

    please kindly send me the diagram of a 12v dc-ac inverter of 5000watts.

    leoken -December 09, 2007

    Please send me the diagram for a 24v dc-ac inverter diagram 0f 50-60hz

    kenneth -December 09, 2007

    Please send me the diagram of a 12v dc to ac inverter diagram of 50-60hz.

    de lion -December 09, 2007

    thank u please can the circuit diagram be sent to my address for closer examination

    Anonymous -November 26, 2007

    hallo sir,how to make the UPS.

    mughees tariq -November 22, 2007

    please in honour and request of 24v dc to 240v ac inveter circuit diagram with[symbols]of 30kva to defend my project.pure sine wave 50Hz-60Hz.please email me @ ugolinoo@yahoo.com

    Anonymous -November 15, 2007

    pls i need at least 30kva inverter circuit diagram.and also a guide line for it if that will be needed pls.

    ugobest -November 15, 2007

    THANKS

    Anonymous -November 03, 2007

    VBVBVBBBBBBBBBBBBBBBBB

    Anonymous -November 03, 2007

    please with honor and respt, reuest for 12/24v d.c to 240v a.c inverter circuit diagram with (symbols) of 500watts to 1000watts, at freindly low cost send it on my email mugoya06@yahoo.com (uganda)

    mugoya patrick -November 03, 2007

    Hi, please send me vie email 5000W ( AC 230V / 60 Hz ) pure sine wave inverter circuit, input 12/24 VDC Thank You mesilaci

    mesilaci -September 16, 2007

    Please send me an Inverter (low cost) Circuit diagram 12 Volt DC to 220 volt AC 500/1000 VA P L E A S E . . . . . .

    Shafikul Azam Khan -August 29, 2007

    I want to be 12volts DC convert to 220volts ac Inverter circuit diagrams. ( Useing nomal electronic componant, Nomal IC, track or scr) pleac send mea thats inverter circuits diagrame to my email adress.

    Alankara Manoj Prasanga De Silva -August 26, 2007

    pls kidly send me an inverter cct diagaram of this specification.i/p12vd.c,o/p240va.c,and power of 1KVA.i will be in need of it for my final project.aj fed poly ede from nigeria

    ajpeter -August 20, 2007

    kindly help me for inverter circuit diagram 12vdc to 220vac help

    Anonymous gabriel -August 07, 2007

    kindly help me for inverter circuit diagram 12vdc to 220vac help

    Anonymous gabriel -August 07, 2007

    WAWYWAWY

    Anonymous -August 06, 2007

    Hi, this is manem... I'm in need to a high power inverter 12V DC to 220V AC which could handle more than 1000W at least. I'd be most grateful if you could help me with a non heavy - good design that could do the job. Regards

    manem -August 02, 2007

    this is the great invention for that time its i m a student of electrical technology and eager for know found such kind of that thing .i have a project to connect my home music system in car i have to use that type of inverter so its good for me

    salman -June 29, 2007

    pls help me . i need a dc to ac(24vdc to 220ac 60 hz sin wave 5000w) to complete my project for my higher national diploma

    olusegun fatai idris -June 18, 2007

    Hi, i need to find the input requirement for a particular electroluminescent lamp i.e. the relation between output of the inverter and the size of the lamp. plese reply to f2005065@bits-pilani.ac.in as soon as possible. thanks

    Prashant -May 28, 2007

    Hi, I need a circuit for 24V DC input to give a 230V ac output which can be used in a car for Ac supply Cd player. Please help me as soon as possible

    Anonymous -April 30, 2007

    Hi, I need a circuit for 24V DC input to give a 230V ac output which can be used in a csr for Ac supply Cd player. Please help me as soon as possible.

    Anonymous -April 30, 2007

    its me again i just want to say that I realy-realy need it soon

    yusri -April 16, 2007

    hallo I need an inverter circuit specification: input:12VDC/4A output:220VAC-900VA please send me if you have it I need for graduating my study at POLMED

    yusri -April 16, 2007

    any one pls send high frequeny low coast inverter schematic

    Anonymous -March 10, 2007

    thanks for helping me to know more about inverters.I'm a student of kumasi polytechnic persuing electrical engineering 'technician 2' may God bless you.

    sam addo -January 04, 2007

    Hi, i need a 220-240VDC 30amp converter to 220-240VAC 50herz 30amp ! Can i use a oscilator ? Mosfet ? Ipf ?? With a 1:1 transformer of 30 amperes ???? My email ct2gnh@hotmail.com

    Anonymous -January 01, 2007

    Hi, i need a 220-240VDC 30amp converter to 220-240VAC 50herz 30amp ! Can i use a oscilator ? Mosfet ? Ipf ?? With a 1:1 transformer of 30 amperes ????

    Anonymous -January 01, 2007

    i need a pdf for making 12 to 220 inverter circuit im looking forward to getting aanswere from you bye

    vahid -December 29, 2006   (Article Rating: )

    its me again please i corret my email address please help

    Anonymous gabriel -December 28, 2006

    please this email address rielcom2000@yahooco.uk thanks for understand my mistake thanksssss

    Anonymous gabriel -December 28, 2006   (Article Rating: )

    plaese with honor and respt i request for 12v d.c to 220v a.c circuit dragming please kindly send to me now or to my email thanks for assistants inverter 500wts to 1000wts low cost thankssssssssss

    Anonymous gabriel -December 28, 2006   (Article Rating: )

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