FTS series Inverter hybrid with MPPT
What is the software startup and shutdown function of the power supply achieved?
A: The software power-on/off function of the power supply is realized through the PW-OK circuit. When in standby, PW-OK outputs a zero-level power self-check signal to the host, and the host stops working and is in a standby state. After the controlled startup, PW-OK will jump from 0 level to +5V after a few hundred milliseconds after the output voltage of the switching power supply is stable, and output a high level signal to the host. This signal is equivalent to the PG signal of the AT power supply. The host starts the system after detecting the PW-OK signal that the power supply is intact. If the main unit is powered off or shut down during the operation, the PW-OK output signal disappears several hundred milliseconds earlier than the +5V output voltage of the ATX switching power supply, and informs the main unit to trigger the system to automatically shut down before the power is turned off to prevent sudden power failure. The hard disk head is too late to move to the landing zone and scratches the hard disk.
What are the characteristics of passive PFC?
Answer: Passive PFC generally adopts the inductance compensation method, which improves the power factor by reducing the phase difference between the fundamental current and the voltage of the AC input. The power factor of the passive PFC is not very high, only 0.7~0.8, and the heat is generated. bigger.
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