Panasonic gph5d 사용자 설명서

 

32

 

 

Figure 30 

 
Power Factor Control 
 
The power factor control circuit operates like a boost regulator. The incoming AC 
voltage, after being switched on, enters the rectifier D402 where it is converted to 
DC. The Power Factor Control (PFC) circuit converts the DC level to 400Vdc. 
The negative side of the bridge rectifier D402 connects to ground via a resistor. 
As current flows through the resistor, the resulting voltage drop enters pin 5 of 
connector P19/P19A of the power factor control circuit board. The power factor 
control circuit board is a switching control oscillator circuit which boosts the input 
voltage at pin 2 of the transformer T401 to 400Vdc. As the pulses are output at 
pin 4 of connector P19/P19A, the transistors Q400~Q405 are switched On/Off 
controlling the charge and discharge time of the inductor L401. The output 
voltage is monitored via pin 11 of the connector P19/P19A. The resistor R548 
adjusts the output voltage to 400Vdc. The 400Vdc output to pin 2 of the 
transformer T401 subsequently enters the drain of transistor Q416.