Ka7500 circuit

This power inverter is designed for 12v DC, but also can be connected to 24v DC, my goal is watt, strive to watt pure sine wave output. The home inverter overall structure is, downside is a large cooling plate, upside is a power board with same size as the cooling plate, length mm, width mm.

DIY converter from 12 to 220V 100W

Due to the high current, soldered three pairs 6mm 2 cords to the power panel of the home inverter. Learn a lesson from previous experiences: In previous designs, the inverter PCB design was not good enough before spending a lot of time and money to make samples. So, I fully take into account of the PCB board flexibility in drawings for this home power inverterusing one board for multi-purposes, and then the cost is lower.

Show as above picture: reserve a position for an inductor on the PCB board, in general, it's quasi open loop, do not install the inductor, direct connected, if you use a close loop voltage regulation, install an EC35 inductor on this position. The red component on above picture is a 0. On the left side of the sampling transformer, there is a place like a small transformer is the reserved position for current transformer. There is no current feedback for this home power inverter, so it's not equipped the current transformer, it's connected under the PCB directly.

ka7500 circuit

Above picture is the interface of the inverter SPWM driver board, four holes are used for installing 4 power tubes of the H-bridge. The white component is 0.

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Two 40 diameter filter inductors are winding with 1. There are two circuits installed for this power inverter, one is 27k frequency, for ordinary transformer drive, the other one is 16k, to try the effect of amorphous magnetic transformer. Also, the two tubes do not use bootstrap power supply, but with the three sets isolated power supply to the optical coupling. Due to the small transformer is delayed, so this board has not been installed.

The SPWM driver in this scheme is flexible, either MCU, or use pure hardware, as long as the driver board interfaces are designed to be consistent, it can be plugged into a power board of this scheme, and even can be made into a square wave inverter. The big tubes of DC-DC power section are notbut RUN08, as this tube is slightly cheaper thanso it worth to take a try. There are two options for the high-power tube of H-bridge, one is commonly used IRFP, the other one is IGBT 40N60, obviously they are not the same grade tubes, 40N60 is much more expensive, but indeed, I feel 40N60 is much more reliable.

These are fast recovery packed diodes TO, 15A V, the price is affordable. I think the cooling effect is certainly stronger than ordinary plastic pipe diodes. The transformer is winding with two EC49 cores, each power is watt, the margin should be relative large, primary is parallel and secondary is series.

The reasons of using two transformers: 1, benefits for the power output; 2, the ratio of transformation becomes smaller, and then the spike problems may have less headaches. September 2, Today, I try to power on the former stage, but not succeed at the first time. No-load current is nearly 1A, troubleshooting reason is the transformer, then change the transformer core, and no-load decrease to MA MH of each transformer, which is acceptedobviously the importance of the transformer core, and it's difficult to buy a few pair good cores.

The next step is preparing loading for former stage, the former stage quality is the key factor for a home inverter to output prospective power. There is a little problem of the high-power switching power supply needs to be solved, so it may take few days for loading test.

The current of the regulated power supply on the picture shows MA, because it's not completely no-load, I add a LED to it, with K2W resistance for voltage reduction, this indicator circuit consumes nearly 1 watt power, increases about 90MA current.

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September 8, Today, add load to test the inverter former stage which is open-loop, and no inductor installed, there are two steps: Step One: Loading about watt, the load is a R, watt resistance, the operating current is Continuous work for one hour, the temperature of the cooling plate, N08 power tube and transformer only rise a little, D pole waveform is still good, spikes just expose, but not obvious, the bus voltage is V.

Step two: increasing the load with two watt bulbs in series, then the operating current is about If the power inverter output w, the former stage should be watt at least. From today's situation, the temperature seems to rise a bit faster, the temperature increase mainly in the high-power MOS tube and transformer.Frequency Converters. Variable Frequency Drives.

Power Inverters. Voltage Converters. Soft Starters. Few days ago, GoHz made a 24V W power inverter in home, sharing some design schematics and circuit diagrams. Power inverter testing. The picture was taken in short-circuited. Output waveform.

The SPWM accuracy of EG was not high enough waveform, so the inverter output was not good enough as pure sine wave.

300W Car Inverter Circuit Introduction

The dead zone time was a bit long 1uSwhere the zero-crossing point did not look good, in order to ensure the safety of the tube, GoHz did not adjust it. This was a full load test on the power inverter, two water heaters, about watt, the water was boiling completely. Maximum connected load was watt for approx 10 seconds, due to the DC power supply limitation paralleling a large DC battery and two small batteriesGoHz did not continue test it.

Adjust the inverter power limitation potentiometer, limit the maximum power at watt, a little greater than wattthe power inverter works for less than two seconds before it turn off the output. Short circuit protection is also set about two seconds to turn off the output. Due to the EG programming reason, the power inverter will continuous work after a few seconds if the power supply is not cut off.

This power inverter has a good starting ability, it only takes about 1 second for two parallel watt solar lamps. This inverter is designed to power about watt, the headline of this paper is watt is because the DC power supply maximum output current is A, so GoHz tested it at watt, for more than 12 hours testing, it can work well at wattthere would be no problem for the actual load at watt. This is the foreline tube D level waveform when the power inverter was in w full load.

Expanding the foreline tube D level waveform when the inverter in w full load. This is the power inverter in no-load power consumption test. It can be seen from two multimeter, no-load power consumption is Forward toroidal transformer. Using 4 pairs ixfh80n10, 80A, V, Backward power tube is 4 set FQA28N50, output inductor is sendust 52mm with 1. Short circuit test.

This power inverter is sensitive in short circuit protection, after more than times short circuit tests power on short circuit, no-load short circuit, full load short circuit, loading short circuitthe power inverter is still work good.

The output terminals of the inverter and the tweezers were scarred. Here is the circuit section, get understanding the basics of this power inverter, DIY an inverter now. Forward board DC-DC power circuit board, conventional push-pull. It has undervoltage, overvoltage, overcurrent protection, overcurrent protection is implemented by test tube drop. Download PDF file Backward DC-AC schematic, using conventional circuit too, there is nothing new places, the unique is the additional high-voltage detection circuit, means when the DC voltage is higher than V DC, the auxiliary power is turned on, and the backward circuit is beginning to work.

In debugging, add a function of turning off the SPWM drive circuit when the auxiliary power drops, to prevent the inverter bombing incidents when the auxiliary power supply drops but the DC voltage was still high, by adding this function, we can shut down the power inverter in short circuit. Download PDF file. Buying a pure sine wave inverter on GoHz. You have no items in your shopping cart. Blog Tags. Home Blog Homemade w power inverter with circuit diagrams.The entire car inverter circuit-board can be divided into two parts, each part applied a TL or KA chip control circuit composition, wherein the action of the first part of the circuit is 12V DC car battery, etc.

Power will be provided by high-frequency PWM pulse width modulation. In the circuit, R1 15 feet of peripheral circuits IC1, C1 composition of the power soft-start circuitry.

When the voltage across capacitor C1 is gradually increased from 0V, only when the voltage across C1 reaches 5V or more, allowed IC1 internal pulse width modulator circuit starts operating. When the power is off, C1 discharges through resistor R2 to ensure the soft-start circuit to work on the next power-up. R1 IC1 pin peripheral circuit, Rt, R2 composed of the thermal protection circuit. IC1 15 feet to the ground voltage value U is a more important parameter. Found that the requirements under normal operating conditions IC1 15 pin voltage should be slightly higher than the pin voltage pin chip is connected to 5Vwhich at room temperature 6.

The power transistor VT2 and VT4 gate because no positive bias and in the off state, the inverter circuit to stop working.

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The Zener voltage VDZ1 determine the starting gate protection circuit threshold voltage value, VD1, C2, R6 also formed sustain circuit protection status, as long as the instantaneous input supply overvoltage phenomenon. The protection circuit will start and continue for some time to ensure security in the post-stage power output tube. Considering the magnitude of normal changes in cars during battery voltage, typically VDZ1 Zener voltage of 15V or 16V selected as more appropriate.

C3 IC1 3 feet peripheral circuits, R5 constitute a power soft-start time maintaining circuit protection and maintain critical state circuit.

It is in fact start control circuit soft-start control or protection circuit, which are reflected in the final result IC1 3 feet on the state level. When the circuit is working or the protection circuit is activated, IC1 3 feet will be high.

When IC1 3 feet is high, it will charge the capacitor C3. This results in protection circuit is activated incentive disappears, C3 through R5 discharged by the discharge time is required, so that the protective state of the circuit is still maintained for some time.

IC2 5 feet external capacitor C8 and a 6-pin external resistor R14 k for the pulse width are modulator timing components. When the output voltage is too high will cause the regulator VDZ2 breakdown, the IC2 of 4 feet on the ground voltage rise protection within the chip IC2 circuit action, cut off the output.

Car inverter circuit MOS transistor VT2, VT4 has some power, you must install the heatsink, and other devices are not required to install the heat sink.

When the car power inverter products continually applied in higher power occasions, small fan is needed to be installed to help dissipate heat. Is Power Inverter being used widely? Power inverter is indispensable electronic products in life. We know a lot of knowledge about the inverter and inverter is used everywhere in life.

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The maximum output current depends on the performance of the PC power supply. Preliminary Note: This modification guide is still under development.

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The problem is, that every single PSU has different protection circuits. Without wiring diagram it is hard to figure out, how the circuit works in details. My modified PSU is still in the test stage.

The label of my AT power supply provides information about the performance. The housing of the AT power supply, which I used for my experiments. Safety instructions and warnings: Inside Switching power supplies occure high voltages and high currents, which can be fatal for your live or can cause a fire.

The modification may only done by professionals, which can realize the dangers and know what they are doing. Any liability and warranty is excluded. Even hours after the shutdown of a switching power supply, the electrolytic capacitors in the primary circuit can still be charged with several volts. They should be discharged with a volt bulb.

The switching power supplies should always operate with a protective conductor. The electrolytic capacitors in switching power supplies can explode after the first power on, when the unit was not in operation for a long period. The board of the AT power supply before conversion.

1000w 12V DC Home Power Inverter Circuit Board Design

The thick cables have to be cut off with the expection of a few black and yellow cables. This is the feedback loop we have to modify. The site is worth reading. The principle of the modification: Pin 1 of the regulator IC KA has to cut off from all other components.

With the potentiometer P1 you can adjust the output voltage from 2. With this modification you can adjust the output voltage yellow cable from 2. Make shure that the regulator IC is supplied by a separate working voltage. This should be checked before you begin with the modification. In the worst case the output voltage can rise up to 30 volts, if the feedback loop ist broken. This may have serious consequences.What would you do if you have got a couple broken Switch Mode Power Supplies, a screw driver and some curiosity!?

Well obviously you would crack it open and try to figure it out. I have to admit, we would probably have opened them before they were even broke. That is exactly what I did. It was actually much easier done than said. OK may be there are, but I failed to find some. That is why I decided to make a series of posts with my repair notes, schematics and stuff I have learned through opening those bricks.

Being the first post, this is the schematic post. You can grab the schematics available on the net here. Please send me a link if you have found a new schematic and I will add it here. There are only minimal differences in their specs. The EMI filter and output filters are usually left out, and the components heavily underrated. The schematic is hard to find, not drawn by me.

I found some inductors to add to the output filter, but couldn't find any for the EMI filter at input. The TL LM39 combination was the most widely used one till recently. Newer Post Older Post Home.

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And the CPU is not in normal heat. The VRM circuit is checked. Motherboard Power on cpu Well obviously you would Step by step to repair mainboard: Step 1: Power button: If there is power step 2, otherwise check power supply circuitincluding: sta Ideal Computer Institute Ludhiana.

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The KA contains an error amplifier, an onchip adjustable oscillator, a dead-time control comparator. Abstract: smps 3. Abstract: KA ka Ka Text: The KAC consists of 5V. The KAB con sists of 5V. OK, Thanks We use Cookies to give you best experience on our website.

ka7500 circuit

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ka7500 circuit

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