Power output rectangular pulse after the change is to start with the minimum duty cycle to 50% of the state, mainly to protect the signal is not being driven by a power MOS step in a larger duty cycle of state, to reduce the power of the moment MOS impact pressure. In the first stage driver circuit, BT input voltage range of 10-15V, and SG3525 wide operating voltage range of 8-35V, LM358 single supply voltage range of 3-30V, so BT voltage sufficient to drive the two chips, so the first stage power supply may be used as part of BT powered.Īs shown above, the PWM signal generating circuit SG3525, when this part of the circuit's access to power 12V, SG3525 was electric, and then set up by the internal oscillator and external oscillator capacitor C4, a resistor R5 and the dead time of oscillation resistor R8 constitute Dr tooth wave generating circuit, provides the clock source for the entire IC, so that the IC work states, because access to the boot soft-start capacitor C6. 12v 300w inverter circuit structure and principle analysis Power board main components: the power board includes a pre-reverse polarity protection, DC-DC step-up push-pull, H-bridge inverter and rectifier filter section also includes over-current protection circuit, a quasi-closed loop feedback section and under small portion of voltage alarm circuit. (See Detailed EG8010 SPWM chip data sheet) ģ. The stage driver board is composed of three parts: generating (SCM EG8010) SPWM signal portion, the driving portion of the IR2110, and over-current protection section. The pre-driver board is mainly composed by three parts: the power supply section, PWM driving portion and over-voltage protection section Ģ. This inverter is composed of three parts: pre-driver board, stage driver board and power board.ġ. Overall, this is a uni-polar 12V isolating pure sine wave inverter. Under-voltage protection 10V immediate shutdown over-voltage protection 15V immediate shutdown overheat protection: 65℃. Overload protection 500W immediate short circuit protection voltage alarm 10.3V delay 1.5S Overall efficiency: 87% 300 times the power short-circuit, short-circuit power 200 times Output voltage: Output single phase 220VAC (RMS), a frequency of 50☑Hz. Nominal power: 300W continuous power: 250W Peak power: 600W 12v 300w uni-polar isolation of pure sine wave inverter Basic parameters
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