the 3d15d inverter circuit is shown in the following figure
After the 12V power supply is turned on, the multivibrator composed of V1, V2, R1, R2, R3, R4, C1 and C2 will start to vibrate in the voltage stabilizing circuit composed of the voltage stabilizing tube VD and the current limiting resistor R7. The collectors of V1 and V2 will output positive square waves close to 5HZ in turn, and the integrator circuit composed of C4 and R6 will pass through C3 and R5.
after inverting amplification by V3 and V4, V5 and V6 are excited respectively, so that the terminal power tubes V7 and V8 can get enough driving power to turn on and off in turn, and their collector currents will flow through the primary windings L1 and L2 of the transformer, which will induce quasi-sine wave high-voltage output of approximately 5HZ at the high-voltage side of the transformer.
Extended information:
Notes on the use of inverters
1. The DC voltage should be consistent
Each inverter has the connected DC voltage values, such as 12V, 24V, etc. It is required that the selected battery voltage should be consistent with the DC input voltage of the inverter. For example, a 12V inverter must choose a 12V battery.
2. The output power of inverter must be greater than the use power of electrical appliances, especially for electrical appliances with high power when starting, such as refrigerators and air conditioners, and a larger margin should be left.
3. The positive and negative poles must be connected correctly
The DC voltage connected to the inverter is marked with positive and negative poles. Red is the positive pole (+) and black is the negative pole (-). The positive and negative poles are also marked on the storage battery. Red is the positive pole (+) and black is the negative pole (-). When connecting, it must be positive (red is red) and negative (black is black). The wire diameter of the connecting wire must be thick enough and the length of the connecting wire should be reduced as much as possible.
4, should be placed in a ventilated and dry place, beware of rain, and have a distance of more than 2cm from the surrounding objects, away from flammable and explosive products, and avoid placing or covering other items on the machine, and the operating environment temperature is not more than 4℃.
Reference: Baidu Encyclopedia-Inverter