Parallel voltage regulator for battery - type measuring...
Phase-regulated switching circuit
Phase-shifting transformer system
Polyphase ferroresonant voltage stabilizer having input...
Positive differential alternating current switching means
Power circuit for different stabilized dc voltages
Power control system
Power control system adaptable to a plurality of supply...
Power controller circuit with automatic correction for phase...
Power controller device
Power conversion device for solar cell
Power converter control for automatic maximum power point...
Power factor correction circuit
Power factor correction circuits
Power factor correction system
Power factor improving arrangement
Power factor maintenance system
Power factor matching in an ac power meter
Power factor monitoring and control system
Power flow controller responsive to power circulation demand...