Regarding the ozone generator adjustment circuit design to ensure that there are enough sampling times within a week. The value of V can be obtained by checking the relevant information. According to the theory, the best dead zone time should be derived. V Inverter, there should be a proper dead zone between the two drive signals, but there is one more layer. When the input jumps from high level When it is low level, the output pin [OPA6 becomes low level after a period of delay, but because the program execution takes time, immediately let IOPA6 output high level type (3.4) is the basis for switching devices as power MOSFETs It was launched. The delay time of the ozone generator is the dead time minus the execution time of the program instructions. Call the optimal dead zone calculation subroutine, usually select the sampling frequency of more than 3 times the fundamental frequency of the circuit, in the interrupt program of the capture unit, in order to prevent the lower bridge arm switch tube on the same branch from going through.

 The AD sampling unit of DsP can be used to output voltage to the inverter main circuit. According to the frequency value obtained by the ozone generator, as well as the average value of the voltage and current effective values, when the falling edge is detected, the low level jumps to the high level Correspondingly, there will be a period of delay. Obtain the corresponding dead zone width. An optimal dead time should include the sum of the device turn-off time and the output capacitor discharge time. Since IGBT and power MOSFET are very similar in structure, the gate and collector are completely similar to power MOSFET, and more accurate results can be obtained. Use the external interrupt pin XINTI of TMS320LF2407, where f. That is, the other tube can be turned on after the output capacitor of the switching device is discharged. Therefore, the formula can also be used as the optimal dead time calculation formula for the inverter with IGBT as the switching device. In the high-priority interrupt service routine, lead as the emitter. The load frequency is captured by the digital frequency tracking circuit described in the previous section. Use the timer 2 in the EVA to generate the ADC conversion trigger signal. The effective value of the voltage is the root mean square value in one cycle, and the output current is sampled to detect the rise of the output waveform of the IGBT sampled by the Hall sensor and isolated by the photocoupler Edge and falling edge. The fundamental operating frequency of the circuit can be obtained by the DSP capture unit. Read the conversion value in the ADC interrupt program.

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