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High Efficiency Digital Power Supply

Overview

This design introduces the first interleaved CrM PFC + LLC power supply utilizing an inverter micro MCU by Renesas. It delivers three distinct output channels: main power, audio power, and backlight unit power. The MCU provides digital control for all operations, achieving power efficiency that significantly surpasses conventional analog TV power supplies while maintaining ultra-low power consumption. This design is ideal for modern home theater systems and other consumer electronics requiring high efficiency and precise power management.

System Benefits:

  • Achieves high efficiency of over 94%.
  • Reduces standby and light-load operation current.
  • Supports various circuit topologies with an MCU.
  • Lowers total cost by reducing the number of components.

Block Diagram

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4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 CN030 CN030 CN030 AC Power Source Alternating Current Sheet.9 AC Relay AC Relay AC Relay LDO LDO LDO IR Receiver Module IR Receiver Module IR Receiver Module Ground (earth) Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.42 Sheet.36 Sheet.37 Negative Power Rail Line.758 Line.759 Sheet.43 Sheet.44 Sheet.45 Negative Power Rail Line.758 Line.759 Connector Arrow Connector Arrow.56 Connector Arrow.57 Connector Arrow.58 Connector Line Sheet.65 Sheet.66 Connector Line.67 Sheet.68 Sheet.69 Sheet.70 Sheet.71 Sheet.72 Sheet.73 Sheet.75 Sheet.76 Sheet.77 Sheet.78 Sheet.79 Connector 1.160 Sheet.81 AC 90V – 260V AC 90V-260V AC 90V-260V Shunt Sheet.84 Sheet.85 Sheet.86 Relay Sheet.88 Sheet.89 Sheet.90 Sheet.91 Sheet.92 Sheet.93 Sheet.94 Sheet.95 Sheet.96 Sheet.97 Connector 1.160.98 Output2/Audio 13V Output2_Audio 13V Output2_Audio 13V Output3/Backlight Unit 250V Output3_Backlight Unit 250V Output3_Backlight Unit 250V Output1/Main Power 13V Output1_Main Power 13V Output1_Main Power 13V Sheet.104 ON ON ON OFF OFF OFF Sheet.132 Sheet.133 Sheet.134 Sheet.135 5V 5V 5V 12V 12V 12V 2 Communication Lines B.795 2 2 2 2 Communication Lines B.795 2 2 2 2 Communication Lines B.795 2 2 2 Typ. 390V Typ. 390V Typ. 390V Sheet.149 Sheet.150 Sheet.151 Connector 1.160.152 NTC NTC NTC Sheet.154 Sheet.155 Input Filter Input Filter Input Filter Interleave PFC Interleave PFC Interleave PFC LLC Transfer LLC Transfer LLC Transfer Rectifiers Circuit Rectifiers Circuit Rectifiers Circuit AC/DC Regulator AC/DC Regulator AC/DC Regulator MOSFET Driver MOSFET Driver MOSFET Driver MOSFET Driver MOSFET Driver MOSFET Driver Photocoupler Photocoupler Photocoupler MCU MCU MCU MCU INTP INTP INTP VDD VDD VDD TAU TAU TAU INTP INTP INTP TMKB TMKB TMKB CMP CMP CMP 12bit ADC 12bit ADC 12bitADC

AC/DC Regulator

Non-Isolated AC/DC Buck Converters

LDO

Linear Regulators (LDO)

MOSFET Driver

Low-Side FET Drivers

Photocoupler

DC Input Single

MCU

RL78 Low-Power 8 & 16-Bit MCUs

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