Have you ever thought about your hand-made DIY a full-hardware pure sine wave inverter? This article describes the circuit diagram of the full-hardware pure sine wave inverter. You can try it yourself to make a full-hardware pure sine wave inverter.
Full hardware pure sine wave inverter front stage circuit diagram
The picture below shows the front level circuit diagram. This circuit uses optical isolation feedback, working in the closed loop mode. When light load or no load, due to the transformer leak, the output may be overpressive, easy to wear afterward and capacitance. At this time, the duty cycle decreases, and when the load becomes large, the circuit gradually enters the open loop mode to ensure sufficient voltage and power output.
Full hardware pure sine wave inverter post circuit diagram
The picture below shows the back-level circuit diagram.
The advantages of this circuit:
1. The circuit is very simple, it may be the simplest SPWM circuit in the world.
2. Single power supply wide voltage supply (10V-30V)
3. The maximum duty cycle is high. The maximum duty cycle is close to 100%. This will cause the bus voltage to be high, and the bus voltage 340V is sufficient to generate 230 V sinusoidal electricity.
4. Isolation and output, subject to less interference.
As shown in the figure, the LM7809 degrades the battery voltage to a stable 9V, which makes the circuit to operate in a wide power source (10V-30V), and 2N5551 and 2N5401 in the upper left corner constitute a virtual dual power supply, which will be 9V. Two power supplies with a positive and negative 4.5V.
The NE555 and the peripheral component formulation frequency is about 20 kHz high linear triangular wave oscillator, as shown, 2 and 6 of the NE 555 can obtain triangular waves between 3V and 6V.
The IC1 is the LM324, IC1A and the peripheral components form 50 Hz power frequency sinusoidal oscillator, resulting in a sine wave (for generated virtual ground), and the circle is divided into 3.5V.ic1b and IC1c. The peripheral component forms a precision rectifier circuit that turns the sine wave into a 3V-magnified tarpaulus. This taro, the triangular wave comparison of the NE555, although the magnitude of the triangular wave and the hoe waves is 3V, but the lowest potential of this taro is 1.5V higher than the triangular wave. Therefore, IC1D and peripheral components constitute subtraction circuits, The overall of the steamer is 1.5V, so that the triangular waves and steamed buns can compare. LM393B compare work, produce the same phase SPWM wave, this wave and the sine wave-square wave converter output of the LM393A output synchronous square wave feed The encoding circuit composed of CD4081 and the like performs an SPWM signal that produces the final drive power tube. Two 20K resistors and 47P capacitors are used to produce dead zones in high-frequency arms. SPWM1 and SPWM2 for driving high-frequency arms, 50Hz1 and 50Hz2 for driving the power frequency arm.
One of this circuit design is a virtual place and the field conversion. The previous circuit is working in the virtual place, while the circuit after the LM393 becomes a field. Because 4.5V communication (for virtual land) is a 9V pulse in the field. The LM393B peripheral circuit is also similar.
Full-hardware pure sine wave inverter H bridge circuit diagram
The following figure is the H-bridge circuit diagram of a full-hardware pure sine wave inverter.
The IRFP460 of the lower arm is driven directly, and the IRFP460 of the upper arm is driven by bootstrap + light driver. Working principle: When the lower arm is turned on, the midpoint of the power tube of the high-frequency bridge is equivalent to grounding. At this time, the boiled capacitance of 220UF is charged by FR107 and the lower arm pipe, and when the lower arm pipe is turned on, 220uf The capacitance is isolated from the ground, and when the TLP 250 internal triode is turned on, it is equivalent to applying a voltage between the GS of the upper arm tube, and thus the upper arm tube can be turned on and off at the control of the corresponding TLP 250.
1 MH inductance and a 400V 1UF capacitor use to complete high-frequency filtering tasks, turn the high frequency SPWM square wave into a 50 Hz sine wave. Technology area
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)
Our other product:
