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Hi, I am working on a project related to smps but now i am confused regarding the design of the half bridge converter which i am using after the pfc circuit(which is a dc dc converter called zeta).I have referred many designs and found that while designing the primary turns nominal voltage is considered in the design equation. Since i am using a p
Hi, I am building a small AM TX attached. I would like to replace the diodes with tube rectifiers (semiconductor-free), whereas I need to keep the power transformer simple (no center tap). There as three options without a center tap, I am aware of: 1. A half wave rectifier (too much ripple) 2. A full wave bridge rectifier (it must use 4 (...)
Hi folks , i'm having a weird problem , now my smps worked and all was ok until i needed a small repair and accidentally by mistake blew my switching IGBT'S , now I replaced them with new ones of a different kind but before turning them on I checked whether all is ok with my gate drive IC's , I replaced the IC (IR2110) and checked the supply voltag
Hi All I'm trying to write down some requirement for power supplies between 1 to 2 kW range. I do not know how much is the reasonable efficiency numbers that people achieve these days for PFC , LLC resonant and phase shifted full bridge DC-DC converters between 1 to 2 kW range at full load? Is 94% for 1.2kW PFC and 95% for 1.2kW half (...)
The left side is a half-bridge, one transistor is On while the other is Off. The capacitors charge to 1/2 supply voltage each. The node between them is 1/2 supply voltage. Operation might be described as single-ended class B. True AC (at 1/2 supply voltage) goes through the transformer primary. This allows a reduced step-down ratio. [url=o
Hello Experts, I am designing a half-bridge Thyristorized Inverter. The Inverter has to deliver approximately 30 Watts into a R and a R-L load. The circuit is to be designed for laboratory demonstration purposes. Any suggestions on what commutation technique to be used for this application? I have ruled out Class A and Class B commutation b
Hello, We are designing a 20W SMPS which simply supplies 15V at 1A to an RF Phased array antenna circuit. (its for comms). Vin = 48V. We were wondering if it is overly extravagant to do this as an half-bridge LLC converter? Its just that the SMPS will be very close to the Comms signal processors and other sensitive circuitry, so we wondered sh
The small pulse width stuff is complete nonsense. A power piezo transducer like the device in the link will driven by 40 kHz sine wave, obtained by a matching LC network from a switching stage producing a square wave, e.g. a half bridge circuit. Variable pulse width could be used under circumstances to adjust the power level.
Hello friends,I am making a half bridge power converter with two Ultra fast IGBTs and a "IR2153" halfbridge gate driver IC,the switching frequency is 6KHZ and the current frequncy coming from AC line is about EMI filter is needed at the input of the circuit,there are many types of ready to use EMI filters (...)
A decent rule of thumb will get you close: C = I x dT/dV C (in uF) = Amps x microseconds (between mains half cycles) divided by desired peak to peak ripple. Lets see, assume 1,200 watts at 340v dc (= 3.5A) and 34v p/p ripple. Assume 100 Hz from rectifier = 10,000uS hold up time between cycles This is for both C4 and C7 as they are in series acros
Hi, I have to design a 10W power supply to convert the 220V mains supply voltage to drive a piezoelectric actuator using half bridge topology. 310V DC link voltage will be switched at 72kHz and resulting square/trapezoidal wave will be applied to piezoelectric actuator at resonance. I should be able to control the dead-time upto 10us (...)
PC power supplies with 5,12V are used for this reason. Then you can decide if you want open drain control with motor coasting or a full bridge with fast start stop or PWM speed control, then stop change direction using logic level full bridges to switch 12V instead of half bridge. Choose RdsOn much less (...)
This thread discusses a similar topic. Start with a single 24V supply, obtain +12 -12V split supply with virtual ground. It has a possible solution: two stacked capacitors similar to your C1-C2. Each one is charged alternately by a half-bridge. If you wish, add a single inductor in the center, to create a dual-purpose buck converter. ww
I am making a Piezoelectric actuator driving circuit using half bridge. I have to make it work at 220Vrms, 60Hz line voltage. Currently I am testing it at 100Vrms, 60Hz voltage. The line voltage is rectified and converted to DC link Voltage. IR2153S is used as driving chip to drive piezoelectric actuator at 74kHz, using square output wave. I am
Ha, what is the resonant freq of your load with your 10uF caps (20uF effective)? if you strike the early part of a resonant half cycle then the circulating current can be in the order of a few amps but the power supply will be supplying only the losses in the ckt, i.e. fet res losses and I^2R losses elsewhere..... this looks to be what is hap
The function depends of course on the implemented modulation, but a half-bridge inverter can be operated as "active front end" (AFE), a bidirectional AC/DC converter with high power factor. You surely have noticed that the capacitors are already charged to input voltage peak-to-peak of about 620 V if the IGitBTs are permanently off, by (...)
As a good measure, you could define a half sine wave with a power-of-two points of resolution, for example 32 divisions per half bridge yields a good shape. It means that you should generate a table for pickup values to load duty-cycle register containing on that case: 32/2 points ( 1/4 sine wave ). Therefore, the required (...)
Hello, Our customer has requested a PSU to give +/-40V at 320W (for a half bridge class D amplifier supply). Why has he not just requested an 80V rail at 320W and then he could have used a full bridge class D amplifier? Is the reason because +/-40V at 320W gives the same 80V difference but is within SELV voltage regulations?
hello dear Forum, I have designed a 1 KW ultrasonic generator with an half bridge for 28 KHz frequency however I am facing a problem with false turning ON of IRFP460 mosfets the H mosfet is driven ON (unwanted peak) when the L mosfet is driven ON (wanted) by IR2113 and vice versa I have scetched the circuit and mosfet gate signals
Hi I have already design a smps with L6699 (half-bridge LLC) . I connect directly the gate of two mosfet to the HVG & LVG pin of L6699. The output power is about 400watt . Now I want to design new smps with the output power at about 2000 watts. I want to design one high side driver for high side mosfet. I dont know how can (...)
Hello I attached an LTspice schematic, a very simplified version of a MOSFET half-bridge driven by a push-pull isolated signal transformer. The FETs are cross-conducting, but their gate pulses are not overlapped. If I am getting things wrong, can someone please show me the error, why are they cross-conducting? Even if the load and the output
It would be wasteful to use half the available power so I would guess it uses a bridge driver to allow 'almost' all the battery voltage to be used in one direction or the other. By 'almost' I mean there will be a small drop in the driver circuit but nowhere near as much as half the battery voltage. Brian.
Dear Edaboard engineers, I need help here! There is this Sine Wave Inverter circuit I am working on. I did not originate the circuit but instead with my own EDA software I redrawn it in a new way and better layout for easy understanding and I also corrected some mistakes in the the original circuit but still, I couldn't get it to work! I get high
I am making an ultrasonic generator using half bridge used an IRs2110 two IRF840 an pic microcontroller 16f616, MY controller works fine without power circuit but when i complete my circuit then circuit works and after 3 sec microcontroller stops working. I have tried an isolated supply to microcontroller of 5 volt. IRs2110 have 12 volt (...)
Push-pull action is typical of the transistor power supply does not always have to be bipolar +/-. The transistors/ mosfets do not necessarily have to be N-devices. The output stage might have a capacitor in series, or it might be a network of components. This simu
Dear All.. Please help me to choice a chip driver mosfet eg TC4427 . IR2110.. or other..../. for suitable (power) with my circuit mini SSTC half-bridge (tesla coil) 100 watt at 100 volts Thank you so much. lam
I'm designing DC/DC converter for low power application of up to 50 Watt using MOSFET half bridge configuration. MOSFET will be supplied with 325V (dc) which I've to convert into 1.5v(min)-50 volts(max) at isolation step down transformer's secondary. Please suggest me gate driver ICs for 800V. plus any IC with inbulit isolation? Can you sug
Hello, In the below .pdf half bridge schematic, R15 & C3 form a filter to filter out the ringing created by the leakage inductance of the half bridge transformer. Is this the right way to filter out this ringing? Here is the V(SENSE) waveform, and the primary current of the half bridge (...)
use ic tl494 based half bridge smps
Hi All, I have a question about power dissipation calculation. I designed some half bridge driver and simulated that. the current peaks to about 10A only during switching period. I calculated this current through rms and average value and found that there are huge difference b/w that. Irms=about 1A Iavg=about 0.15A Of course (...)
It changes according to your desired output power. half-bridge can be used up to 1.5kW, in the case of more power, you need to select full-bridge. Push-pull can be used in any power as ı know but it has disadvantages as well. Although there are some disadvantages, your output (...)
It should be mentioned, that the NPN/PNP circuit is good as a simple simulation setup, but not suitable for a real inverter design. Also driving BJT through a base resistor isn't a good idea because it involves huge power dissipation. One capacitor? But we need Vs/2 across capacitor. So one capacitor can't do this job. Vs/2 will
To get 75 V AC square waves from 150 V DC, you only need a capacitor to block the resistor is needed at the output, so that the capacitor can charge and discharge. Since your half-bridge already consists of the PIC and mosfets, you can disregard that part of my schematic.
you can get bus pumping on the half bridge for low freq AC supplied to your load, not for the full bridge.
With a H bridge you can push and pull current through the enegising coil. With DC you can only push current through it so you will get half the power. Frank
Is this pumping the result of large transient current flow through power supply resistance? Isn't that same for full or half bridge? The power supply voltage buses of half-bridge circuits can be ?pumped? beyond their nominal values by large inductor currents from the
Have you studied the half-bridge topology? Where exactly are you stuck? Have you studied the various sections - oscillator, PWM, driver, MOSFET bridge, transformer, output rectification, feedback, etc?
2.5Kw is pretty high for single-ended converters like forward and flyback (even quasiresonant flyback), so I would look more at half or full bridge converters. Maybe a two switch forward converter. At high power levels you want to try to reduce voltage stresses on the switches, so that you can use lower voltage rated devices.
power MOSFET drivers or bridge drivers may do this but generally they are not so fast. At the 40V node, BJTs are good for less than 1GHz fT pretty much, and that's if you're really careful about preventing saturation. 40V MOS is even slower. Anyway, I think I'd look at high side FET drivers or using a section of a (...)
Dear surz Hi A good THD ratio for a class D amp will be lower than 0.1 percent . which topology you are referring to ? half bridge ? full bridge ? differential three level SPWM ? ..... ? because it seems pretty unusual . how much is the frequency of triangular wave ? Best Wishes Goldsmith
Believe it or not.... Ceramic SLA batteries have a temperature dependant charge limit time curve with temperature dependant cut-off voltage otherwise the MTBF of the battery suffers quicker. If you are not fussy use a 750W hair dryer on 1500 watt on half power @120Vac with a full wave 20A 300V Schottky $5 bridge so it is cool between (...)
For bridge rectifier+ filter cap DC supplies you should assume a VA/W "form factor" of 1.6 respectively 2.0 for half-wave rectifiers. Losses of linear voltage regulators add.
hello, I am trying to develop a digital feedback control for a 45-W half-bridge converter, microcontroller used is from microchip dspic33fj16gs502. PWMs provided to the mosfets are around 3Mhz and the power to microcontroller is self-supplied through auxiliary output of transformer. Currently i only have feedback signals of auxiliary (...)
Dear mtwieg Hi What is "diagonal half bridge " ? i'm not familiar with that and what is the difference between that and a usual half bridge ? ( with simultaneous supply or with single supply and two capacitor ) ? Is it possible that you tell me about it , please ? Best Regards Goldsmith
In general, it is a method of supplying power to a high-side NMOS driver of a switching half-bridge. For a half bridge output to be driven high, the gate of the high-side NMOS must be driven above the supply of the half-bridge. Some form of self-driven charge-pump (...)
The IR2110 is a bootstrapped half bridge driver and its lower frequency operation is going to be limited by the size of the fly cap and the bleed current of the high side driver circuitry. Now the 2110 is not a spectacularly high voltage device if I recall. But it is pretty well known. I believe it is meant for the older 10V-ish power FETs (...)
Since it's half-bridge, for short-circuit protection, you should use a current transformer in the path of the power transformer. For overvoltage protection, step down the DC bus using a voltage divider, eg, by a factor of 100. So, 300VDC gives 3V at the output of the voltage divider. Say, you realize that overvoltage is defined for voltages (...)
Complicated methods may provide this but it will be convenient to adopt a design as shown. If at all you need to simplify it at the cost of its utility and versatility, you can replace the bridge using half wave rectification. You can drop the two 1N4004 diodes. You can drop the LED's and their series resistors. Then it would look pretty simple. Th
Markings of this kind are usually assuming knowledge of a device principle circuit. They are not primarly intended to support guessing about unknown components. Nevertheless "AK" is almost self explanatory in my opinion. It can e.g. refer to the center tap of a half bridge, in other words a terminal, that's connected to both, anode and cathode.
Which topology is suitable for this project? I want to start with half-bridge and multiplier, anyone give advise?