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Location diagram of power board
The power supply consists of the EMI filter, PFC , Standby power, Audio power and Main power. The system
required voltage is converted from the Standby, Audio and Main power, and the high voltage DC 380V from PFC
is applied to the lamp and Audio and Main power.
Line voltage can directly input from 90Vac to 264Vac and boost to 380Vdc for the output, there are common
choke L205 and L206 , and CX200, CX201 capacitors to form a
EMI filter
that can reduce noise and interference.
PFC
is main for shaping the ac input line current waveform to correspond to that of the ac input line voltage, and
boost input rectified voltage to 380Vdc for preregulator.
The output voltage 5Vs is converted from
Standby power
, when the system is going to the standby mode, 5Vs is
the only output voltage. After the Power_ON ( CN205 pin12 ) is high, then other voltage outputs are starting up,
otherwise there is only 5Vs. The output v20V, -20V are converted from
Audio power
, they are used by
audio module, and output voltage 5.1V, 8V, 12V are converted from
Main power
. They are the main electrical
power for whole electrical system.
ACin
EMI filter
Standby
power
PFC
380V
Main power
Audio power
Содержание RP56HD21
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