LIPS Board Block Diagram
50 ~ 60Hz |
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| 12V |
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EMI | INPUT RECTIFIER | HVDC | SWITCHING | 100KHz | OUTPUT RECTIFIER | 5V |
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COMPONENTS | AND FILTER |
| TRANSFORMER |
| AND FILTER |
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LINE |
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| GND |
100 ~ 240V |
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| PWM CONTROL |
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| SIGNAL |
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| COLLENT- |
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| CIRCUIT |
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| ISOLATION |
| ION |
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PRIMARY |
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| SECONDARY |
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12V | INVERTER CIRCUIT | High Voltage |
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Operation description_LIPS
1.EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC,VCCI CISPR, the circuit included a
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 for transfer the primary energy to secondary through a power transformer.
4.Output rectifier and filter.
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 stabilized, 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.
Copyright 2007 LG Electronics. Inc. All right reserved. | LGE Internal Use Only |
Only for training and service purposes | - 15 - |
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