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50 ~ 60Hz
EMI
COMPONENTS
LINE
100 ~ 240V
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR,
the circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is transfer the primary energy to secondary through a power transformer.
4. PWM control circuit.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to
adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilize, and
also the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to
achieve the stabilized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo
transistor.
7. Output rectifier and filter.
This part function is to achieve the dc output voltage stabilize.
HVDC
INPUT RECTIFIER
AND FILTER
PWM CONTROL
CIRCUIT
PRIMARY
Operation description_Power
- 11 -
100KHz
ENERGY
TRANSFER
PHOTO-COUPLER
ISOLATION
SECONDA RY
12V
5V
OUTPUT RECTIFIER
AND FILTER
GND
SIGNAL
COLLECTION
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