Hello elcircuit friends, this time elcircuit will post the TDA7294 power amplifier scheme added with the stepper circuit, this stepper circuit serves to increase the efficiency of the TDA7294 amplifier because it uses 2 power supply voltages, namely low voltage, and higher voltage. so the voltage when standby or output is still below the clip point of the low voltage, the medium used to supply the amplifier is the low voltage. and if it approaches the point of clip, the supply voltage will increase linearly (Class-G Amplifier). The following is a schematic of the reference IC TDA7294 datasheet which changed the value of the part so that it is easy to find the components. In the final stepper transistor section, you can use the TIP3055 / 2955, 2SC2922 / 1943, etc.
To facilitate assembly, elcircuit also provides a PCB file in the form of a Gerber file as shown below. The power in this TDA7294 + stepper amplifier circuit can produce up to 180W. Low Voltage supply 12VAC-25VAC Higher voltage supply 32VAC-45VAC.
This type of inverter has a high power efficiency of up to 95%, meaning that the power issued by the battery to the output power at 220v ac will be distributed 95% with relatively low power usage at a certain inverter capacity so that it can save battery power if you have a sufficient battery system, slightly different from the low-frequency inverter EGS002. In most cases the damage to the inverter is more of a high-frequency type or switching inverter because there are many in the market and a wide price range so that it can be found at competitive prices, most cases are damage to the H-Bridge MOSFET which meets directly with a 220v load, different from low type inverters frequency using a transformer, to build a high-frequency type inverter with good quality and durability requires more supporting components in order to get good quality on the inverter
I have made a high-frequency transformer version of the inverter, with an input voltage of 24VDC which you can see in the preview schematic below, to see more details you can download the PDF version of the schematic.
And to make it easier to build this inverter, I have designed the PCB Layout Inverter EGS002 High-Frequency transformer version, which you can see in the PCB layout preview below.
The PCB is fixed, I added several features such as Over Current Protection, Automatic switch, Remote Switch, Under Voltage Protection, Under Voltage Warning (Beeper), Fan Control by thermal sensing. You can download PCB with Gerber format, and you can order at PCB Fabricate online like JLCPCB.
And the following is a video of the assembly, along with testing this EGS002 High Freq Inverter. This inverter can produce up to 1000W- 2000W depending on the input voltage, the greater the current capacity of the battery, the greater the power output.
In the video, I use the FDP054N10 MOSFET for the DC STEP UP part and the W20N50 MOSFET for the SPWM EGS002 section.
The selection of the MOSFET greatly affects the power output as well as the shape of the sine wave. For components such as resistors, capacitors, and others, use quality components, install the values as stated on the PCB label or download the part list below.
Egs002 is a Board Module for building pure sine wave inverters, this module uses the eg8010 microcontroller ic as a sine wave generator, this ic is used in many manufacturers of pure sine wave inverters which are quite popular. with inverter power ranging from 300w to over 10,000 watts net, with this module we can build Pure Sine Wave inverters at low prices with the same wave output. The schematic Inverter 12V /24V DC to 220VAC with EGS002 (low power frequency transformer) same as the video in this post:
The Low-Frequency EGS002 Inverter has the following advantages:
-The circuit is compact, does not require a High Volt DC circuit like the High Freq type inverter
-Durable/durable in shock loads, especially induction loads (dynamo/motor) because the dynamo starting current/initial current is very high applied to the inverter will be resistant to the first transformer not directly to the MOSFET, in contrast to high freq inverters which will receive direct starting load on the H-bridge MOSFET and there is a vulnerable level if the MOSFET power is smaller / weaker for high-freq type inverters.
-Resistant to high distortion/noise loads, the distortion load has a ripple voltage or very high voltage even though it is only microseconds/milliseconds above the voltage that the MOSFET can experience, but the high ripple voltage will be dampened on the transformer, so it is not directly experienced by MOSFET like the high freq inverter type without a good output filter.
The low freq inverter type has an efficiency range of 70-85% or wider than the high-freq inverter type, which is 90-96%, but if the two inverters are loaded at peak load, the efficiency is almost the same in the 80-85% range.
PCB Layout for DIY 1000W Inverter 12V /24V DC to 220VAC with EGS002 (low power frequency transformer)
Video Assembling and Test DIY 1000W Inverter 12V /24V DC to 220VAC with EGS002 (low power frequency transformer)Download File:
Hello guys, in this post I will share the PCB layout power amplifier Class-D D1K Clocked. Power Amplifier uses an external clock, using the CD4049 IC as a triangle signal generator. The following is a schematic image, this scheme was designed by Mr. Kartino Surodipo Master Class-D from Indonesia.
You can download the schematic above as a PDF file, so you can see a clearer schematic image. Class-D D1K Clocked using External Clock from IC CD4049 as its triangle wave generator. IC CD4049 is very vital, use a good quality IC. so that the shape of a good triangle signal is flawless, if you use a bad IC CD4049, this will result in bad sound output too. Usually, there is a large amount of noise, and even worse, the amplifier cannot run, because the triangle wave does not come out of the CD4049 IC. to balance the PWM gate you can set the trimpot slope balance. and trimpot freq to set the PWM frequency.
And need to pay attention again to the 5V supply, the 5V supply must be balanced too, otherwise, we will have trouble setting the slope balance.
To make it easier to assemble the d1k clocked class-d power amplifier, I will share the PCB Layout file in the form of a Gerber file as well for the part list which you can download at the end of the post.
