Sine wave inverter drive circuit made with SG3525

1. Sinusoidal oscillator, precision rectifier circuit, 50 Hz synchronous wave generating circuit, addition circuit, etc., there is no big change in the previous post; there is no big change; the method of defrunting the error amplifier U3a is slightly Changes, mainly in order to improve anti-interference performance and control sensitivity. 2. The primary chip SG3525 is a bit different, because the 3525 11,14 feet are "Total Pillars" output, I put 11, 14 foots, shield the Totel pillars, and in 13 feet A pull-up is to block the load, the purpose of doing the original 11, 14 foot signals together, with greatly increasing the maximum space ratio. The utilization rate of the bus voltage is also increased, which can be More than 94%. But from the 13th pulse, it is reverse SPWM wave, so it is necessary to use a 4069 to reverse it. 3. Redesign the dead time production section, U7 and R31R32R33R34 and C20C21C22C23 are dead time adjustment circuits. When r = 47k, c = 47p, the high-frequency wave dead time is approximately 2 we, these 4 capacitors should be used High frequency porcelain capacitor. Special note: This circuit can directly push the H bridge, but my H-bridge input is light, and its way is "effective". If the circuit is other driving, it requires "high power" effective " If the timing circuit and the "dead zone" circuit should be amended, there is a picture for reference. The commissioning of the circuit is relatively simple (from the original 5 potentiometers to three potentiometers), as long as the components are not problematic, the wiring is not wrong, and it will work in power. First disconnect JP1, let the circuit open the ring, adjust VR1 The output sine wave is not cut; the VR2 is adjusted to connect the sine wave upper and lower half waves; again JP1, adjust VR3, and adjust the output voltage to a predetermined value. The following is the schematic: Be Be Here are physical maps and waveform photos: Be Be Be Be Be Be Be Be Timing and "dead zone" circuit when "high power is effective": Available active load available for high voltage testing DC double pressure boost circuit diagram (CD4069 / LTC3786 / capacitive multiplier boost circuit) DC twelve pressure stream circuit diagram (multi-harmonic oscillating circuit / time base circuit NE555 / transformer) AC direct stream circuit diagram Daquan (inverter power / boost power / alternating DC converter) 48V turn 12V converter circuit diagram (five 48V turn 12V converter circuit schematic diagram)

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