Offline Half-bridge converterInput: 160 to 240V AC 50/60HzOutput: 14.5v 10A (max)Final test circuit (on PCB) for battery charging. To be incorporated in SMPS inverter with charger.Theprimary side PWM is controlled by SG3525 PWM chip.
Switch Mode Power Supply Circuit Sg3525 Ir2110 900w Smps 60khz Mechanical Electrical Medium size Modifying A Chinese Power Supply To Provide Variable Voltage Lastly Heres The: pin. SMPS Fonte chaveada SG3525 + IR2110 + TDA8950J - YouTube SMPS Fonte chaveada SG3525 + IR2110 + TDA8950J: pin. SG3525 is used extensively in DC-DC converters, DC-AC inverters, home UPS systems, solar inverters, power.
Frequency ofoperation is around 50kHz. The output signals of the SG3525 are fed intoa IR2110 high-low side driver which drives the 2 MOSFETs (IRF840)configured for half-bridge topology. ETD39 core is used for thetransformer. It was wound by hand at home by me. A primary side snubberis used. 2 bulk capacitors (470uF, 200V each) are used for thehalf-bridge converter.An auxiliary 50Hz transformer(18V 100mA) is used to provide auxiliary low voltage output, which isrectified, filtered and regulated to 12V with a 7812 to power theSG3525, IR2110 and related circuitry.
Since average current is low,voltage difference between 7812 input and output is not too great, thepower dissipated by the 7812 is not too high and no heat sink isrequired.The output of the ETD39-based transformer isrectified with schottky rectifier STPS3045 and an LC filter is used tofilter to pure DC. The output voltage is kept regulated using azener-optocoupler based voltage feedback loop. The STPS3045 is mountedon a heatsink. The output inductor is the large toroidal inductor besidethe 50Hz transformer. It has not been mounted on the PCB.NTChas been used at the input side to limit inrush current due to chargingof the LARGE BULK capacitors at the primary side. A fuse has been usedfor protection in case of short-circuit.A 200-ohm resistance is used at the output as 'dummy load'.I have designed the PCB myself and have wound the transformer myself, at home. 1A offline flyback power supply with UC3842Input: 160 to 240V AC 50/60HzOutput: 14.5v 1A (max)Could be used as auxiliary power supply.Theprimary side PWM is controlled by UC3842 chip.
The UC3842 drives thehigh voltage MOSFET (IRF840) directly as it has a built-in MOSFETdriver. 50k resistor is used for startup from the high voltage DC bus -the UC3842 has built-in zener diode that limits voltage, providedcurrent is low enough.EE25 core was used for the transformer. I wound the transformer myself.The output of the transformer is rectified with ultrafast rectifier 31DF6 and capacitor is used to filter to pure DC. Theoutput voltage is kept regulated using a zener-optocoupler based voltage feedback loop.NTC has been used at the input side to limit inrushcurrent due to charging of the capacitor at the primaryside. A fuse has been used for protection in case of short-circuit.This is one of the oldest SMPS circuits I had made.
I made it sometime in 2008. 2A flyback power supply with TOP-GXInput: 160 to 240V AC 50/60HzOutput: 14.5v 2A (max)Thepower supply is based on the dedicated offline-switcher 'TOPSwitch-GX'TOP245Y, which contains both the primary PWM controller and thehigh-voltage MOSFET.EE25 core was used for the transformer. I wound the transformer myself.The output of the transformer is rectified with ultrafast rectifier MUR420 and LC filter is used to filter to pure DC. Theoutput voltage is kept regulated using a TL431-optocoupler based voltage feedback loop.NTC has been used at the input side to limit inrushcurrent due to charging of the capacitor at the primaryside.
A fuse has been used for protection in case of short-circuit.This is one of the oldest SMPS circuits I had made. I made it sometime in 2008. 12VDC to 280VDC DC-DC converter for CFL inverterInput: 11VDC to 14VDCOutput: 280VDC 60WWas designed to drive four 15W CFL's from 12V battery.The primary side PWM is controlled by SG3525 PWM chip.
Frequency ofoperation is around 70kHz. The SG3525 drives the 2 MOSFETs (IRF3205)configured for push-pull topology. EI33 core is used for thetransformer. It was wound by hand at home by me. The 2 MOSFETs are mounted on heatsinks.Theoutput of the transformer is rectified to DC with 4 ultrafast diodes(UF4007) configured as a bridge rectifier.
LC filter is used to convertoutput to pure DC. 12VDC to 220VAC Inverter (200 to 300W) using SG3525, IR2113 andPIC16F676 with features such as low-battery and overload protectionTheprimary side PWM is controlled by SG3525 PWM chip. It drives 2 MOSFETs(IRF3205) in push-pull configuration.
The MOSFETs drive the transformer.ETD34 core was used for the transformer. The output of the transformeris converted to DC. The high-voltage DC is kept regulated by the SG3525using direct resistive voltage-divider based feedback. This high-voltageDC is then converted to 50Hz AC using 4 MOSFETs (IRF840) in full-bridgeconfiguration. The quasi-sine signal is generated by the 16F676.
Theoutput signals are fed into 2 IR2113 high-low side drivers that drivethe MOSFET full-bridge. The 16F676 also monitors the battery voltage forlow-voltage cut-out. It also monitors the load current for overloadprotection.I made this circuit sometime in 2010 after lots of failure in design and implementation.
Hi Tahmid,I found the article interesting, So i though of putting this questing in here. We have designed a circuit for controlling of led dimmer with 7805 and atmega32 microcontroller. It works fine with the lab power supply of 12VDC 300milliamps, but in actual the smps connected for led strips have very high current rating like 5amps and 10amps with 12V or 24V, when this supply is been given to my circuit the 7805 gets to much heated up. I tried using voltage divider LM317 and also switching transistor circuit, but it all failed. I am not able to find the exact problem. But i know its because of the excess amps provided to the circuit. If you can help me it would be great.
No matter what the capacity of the power supply (1A, 5A, 10A or even 100A or more), as long as this is higher than that required, the current flowing through will depend on the load. So, if it works with the lab power supply of 12V 0.3A, it should work with any 12V power supply with supply capacity greater than 0.3A.The problem here could be that the output of the SMPS has 'spikes' that cause the 7805 to heat up. Connect a diode between the output of the SMPS and the input of the 7805. At the input of the 7805 (after the diode), use a 1000uF capacitor with a 0.1uF capacitor in parallel with it.
Try with this and let me know.Regards,Tahmid. Hi Tahmid all of your post are really helpful for who really struck at hardware.
I found lot of information on your post.I am designing a dc to dc converter 20V to 70V input 54V output for a 48V battery.i used inverting topology buck boost converter.I am using mosfet IRFP150N. PIC microcontroller for pwm pulse 5khz, and a3120 gate drive optocoupler to mosfet gate from microcontroller.design parameter are input voltage varies from 20V to 70V.fixed output 54V (including losses).
L=2mH, C=1.62mF. Output current 5A.Problem is my capacitor burst for a input voltage of 25V and there is no boosting operation for duty cycle increment.Is this topology works fine with this power level. ArsiHello,Can I ask for help in simple mobile chargers? The normal average mobile charger nowadays employs switch mode characteristics, but what I do not understand is how the DC signal (achieved after a full wave bridge rectifier from mains supply), is converted into a 100 khz signal and fed into a tiny pulse transformer.
The circuitry hardly has a couple of resistors, diodes (zener ones too), and a BJT (some chanrger circuits have 2 BJT's). If you have any link or any knowledge on this please share, or if you have written a blog on it, please share the link.
I require help in this topic.Thank you for all your efforts. Hy Tahmid,i hope you will be fine.i am having a problem in making inverter.i'm making inverter using tl494 and sg3524.i'm using push pull topology to drive transformer and tl494 to drive push pull mosfet and sg3524 to drive full bridge mosfet.but there is no feedback.its just a simple circuit.can you send me the tl494 and sg3524 circuit with proper feedback.i have shared the only tl494 circuit file.link isemail is [email protected]. Oga tahmid i greet oo.ive tried this ferrite stuff mainly for Inverter application, but the moment i add load on it the heat my mosfets generates is enough to boil a bucket of water. Im using ferrite core from tv power pack.my questions are:-1) does different ferrite cores work with different frequencies.2) is the winding pattern the problem?cos i made sure the coils were symetrical and very tight intact i used machine to wind it cos i no want story.i used 3-0-3 for primary then 80 for secondary turns. My snubber is 4.7 ohms and 470nf cap in series.please tell me where i went wrong.thanks in advance. I am Syed Tahmid Mahbub, from Dhaka, Bangladesh, born on August 1, 1994.Electronics is my passion and from class V, I have been learning electronics.
I learnt and worked mostly on SMPS, power electronics, microcontrollers and integration of microcontrollers with SMPS and power electronics. I've used PIC and AVR microcontrollers - PIC 10F, 12F, 16F, 18F, 24F, dsPIC 30F, 33F, PIC32, ATmega and ATtiny, integrating them with various SMPS and power electronics circuits.I have completed my Bachelor's degree from Cornell University (Class of 2017) in Ithaca, New York, USA, majoring in Electrical and Computer Engineering (ECE).I am a member of the forum www.edaboard.com, where I am an 'Advanced Member Level 5' (the highest level attainable) and also the forum allaboutcircuits.com, where I am a 'Senior Member'. I post to help solve electronics-related problems of engineers and engineering students from all over the world.I love watching and playing cricket and football (soccer), and listening to music.I am now a hardware engineer at Apple in Silicon Valley, California, USA.
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