1000W 1200W HSI PLUS Inverter

HSI PLUS 1000W 1200W solar inverter hybrid pure sine wave inverter with low frequency

Pulse Width Modulation:

Pulse width modulation is an analog control method, which modulates the bias of the transistor base or the gate of the MOS tube according to the change of the corresponding load, so as to realize the change of the conduction time of the transistor or MOS tube, so as to realize the change of the output of the switching regulated power supply. . In this way, the output voltage of the power supply can be kept constant when the working conditions change, and it is a very effective technology to control the analog circuit by using the digital signal of the microprocessor. Widely used in many fields from measurement and communication to power control and conversion.

The basic principle of pulse width modulation (PWM): The control method is to control the on-off of the switching device of the inverter circuit, so that the output terminal can obtain a series of pulses with equal amplitude but inconsistent width, and use these pulses to replace the sine wave or the required pulse. waveform. That is, multiple pulses are generated in the half cycle of the output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output is smooth and has few low-order harmonics. The width of each pulse is modulated according to certain rules, which can not only change the size of the output voltage of the inverter circuit, but also change the output frequency.

In the PWM waveform, the amplitude of each pulse is equal. To change the amplitude of the equivalent output sine wave, it is only necessary to change the width of each pulse according to the same proportional coefficient. Therefore, in the AC-DC-AC inverter, the The pulse voltage output by the PWM inverter circuit is the amplitude of the DC side voltage.

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