Voltage inverter schematic install#
Voltage inverter schematic driver#

No-load current is nearly 1A, troubleshooting reason is the transformer, then change the transformer core, and no-load decrease to 360MA (180MH of each transformer, which is accepted), obviously the importance of the transformer core, and it's difficult to buy a few pair good cores. Today, I try to power on the former stage, but not succeed at the first time. 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. The transformer is winding with two EC49 cores, each power is 500 watt, the margin should be relative large, primary is parallel and secondary is series. I think the cooling effect is certainly stronger than ordinary plastic pipe diodes. These are fast recovery packed diodes TO220, 15A 1200V, the price is affordable. There are two options for the high-power tube of H-bridge, one is commonly used IRFP460, 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. The big tubes of DC-DC power section are not 2907, but RU190N08, as this tube is slightly cheaper than 2907, so it worth to take a try.

Voltage inverter schematic driver#

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. Due to the small transformer is delayed, so this board has not been installed. Also, the two tubes do not use bootstrap power supply, but with the three sets isolated power supply to the optical coupling. This is the inverter SPWM driver PCB board, the scheme is using microcontroller SPWM TDS2285 chip, the output is driven by 250 optical coupling, as it is more reliable. 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. Two 40 diameter filter inductors are winding with 1.18 wire for around 90 circles, inductance is about 1MH, initial magnetic permeability is 90.ДЄbove picture is the inverter DC-DC voltage boost driver circuit, using KA3525. The white component is 0.1R current sampling resistor. 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.ДЄbove picture is the interface of the inverter SPWM driver board, four holes are used for installing 4 power tubes of the H-bridge. On the left side of the sampling transformer, there is a place like a small transformer is the reserved position for current transformer. The red component on above picture is a 0.6 watt sampling transformer, if using differential sampling, this position can be installed two 200k dropping resistors.

Voltage inverter schematic install#

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. So, I fully take into account of the PCB board flexibility in drawings for this home power inverter, using one board for multi-purposes, and then the cost is lower. 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. 4 power tubes of voltage boost portion, 4 power tubes of H-bridge and 4 TO220 packed fast diodes are screwed on the cooling plate directly DC-DC voltage boost circuit driver board and SPWM driver board are plugged on the power motherboard.Дue to the high current, soldered three pairs 6mm 2 cords to the power panel of the home inverter. 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 228mm, width 140mm. This power inverter is designed for 12v DC, but also can be connected to 24v DC, my goal is 800 watt, strive to 1000 watt pure sine wave output.