NXP’S TOTEM POLE BRIDGELESS PFC INITIALLY

INTRODUCE

Totem pole bridgeless PFC Power topology

Output power: 90V 300W, 220V 600W.Output DC voltage: 380Vdc.Input AC voltage: 90~265VacOperation frequency:45~63HzPF: full load > 0.99.Communication port: UART.Efficiency 96%~98%.iTHD < 5%

1. Totem pole bridgeless PFC Power topology

Positive half-cycle

Negative half-cycle

ACV

2Q

1Q

2DS

1DS

C

LR+

-ACV

2Q

1Q

2DS

1DS

C

LR+

-

ACV

2Q

1Q

2DS

1DS

C

LR

+

-ACV

2Q

1Q

2DS

1DS

C

LR

+

-

a) Psitive cycle charging mode b) Positive cycle after-flow mode

c) Negative cycle charging mode d) Negative cycle after-flow me

2. Digital Power Supply - PFC

acV

2Q

1Q

2DS

1DS

CLR+

-

Auxiliary

Power supply

LDO

+12V +5V

+3.3V2 PWM

2 GPIO

SCI0

SCI1

I 2CPM-Bus

USBIsolation

Control daughter

card

MC56F82748

Host PC

LLC

Li

dcU

LiacV

dcU

Driver

Driver

2. Control Logic

acV

2Q

1Q

2DS

1DS

C

LR+

-

dcrefUref

i dcU-+

PI+

-PI

dutyD

(1 )ac

rms

Vk

V +

+ _

ac

ac peak

V

V

PWM

Control frequency 80kHz

dcrefU

Normal Burst

Li

PWM

PWM ON OFF

_U VDC BURSTONdcref

_U VDC BURSTOFFdcref

OFFON ON

_U VDC REFdcref

2. Working Mode

dcrefU

dcU-

+ +- duty

Drefi

2

ac

rms

V

VLi

Vol PI Cur PI

Voltage Loop Reference Arithmetic Current Loop

2. Totem-pole bridgeless PFC control scheme

SM_CTRL_START

SM_CTRL_INIT_DONE

SM_CTRL_FAULT

Transition Init - > Stop

INIT

RESET

FAULT

RUN

STOP SM_CTRL_FAULT

SM_CTRL_STOP

Transition Stop - > Run

SM_CTRL_RUN_ACK

Transition Run - > Stop

Transition Run - > Fault

SM_CTRL_FAULT

Transition Stop - > Fault

Transition Init - > Fault

Transition Fault - > Init

SM_CTRL_FAULT_CLEAR(optional)

MC56F827xx controller advantages and features

56800EX 32-bit DSC core

• Up to 50 MHz/100 MHz operation frequency, up to 64 KB Fash, up to 8 KB RAM

• Programmable Interrupt Controller (INTC) with 4 level priority

• One 8-channel eFlexPWM module with NanoEdge™ placement and enhanced

capture, resolution of up to 312ps

• 2 separate 8-channel 12-bit cyclic ADC

• Single conversion time of 10 ADC clock cycles (10 × 100 ns = 1μs)

• Additional conversion time of 8 ADC clock cycles (8 × 100 ns = 800ns)

• Four High Speed Comparators with integrated 6-bit DAC references

• On-chip 8 MHz/400 kHz relaxation oscillator, 200 kHz Relaxation Oscillator and

4MHz to 16 MHz external Crystal Oscillator (XOSC)

• Inter-Module Crossbar with AND-OR-INVERT function

• One Quad Timer, two Periodic Interval Timers

• Two 12-bit DAC modules

• 5 V tolerant I/O (except for RESETB pin which is a 3.3 V pin)

2. NXP digital power control IC

Signals Alternative Current use

PWM Driver

PWM_L (PWM0)PWM0A or XBOUT6 GPIOF2

PWM_H (PWM1)PWM0B or XBOUT7 GPIOF3

PWM_SR_L (PWM2)PWM1A or XBOUT8 GPIOF4

PWM_SR_H (PWM3)PWM1B or XBOUT9 GPIOF5

ADC

Sample

VAC_N GPIOA0/ANA0 ANA0

VAC_L GPIOA1/ANA1 ANA1

VDC_ADC GPIOA4/ANA4/CMPD_IN0 ANA4

ISNS_ADC GPIOB0/ANB0/CMPB_IN3 ANB0

IS_H_ADC GPIOB1/ANB1/CMPB_IN0 ANB1

IS_L_ADC GPIOB2/ANB2/CMPC_IN3 ANB2

LOGIC IO

RLY_CTL GPIOF7/CMPC_0 GPIOF7

POLARITY GPIOC4/TA1 GPIOC4

Comparator

VDC_ADC GPIOA4/ANA4/CMPD_IN0 CMPD_IN0

ISNS_ADC GPIOB0/ANB0/CMPB_IN3CMPB_IN3

MC56F82748

TestingSystem Efficiency

Vin(V) Iin(A) Pin(W) PF THDi Vout(V) Iout(A) Pout(W) Efficiency

109.55 1.7828 195.06 0.9988 3.30% 383.7 0.4881 187.3 96.01%

109.03 3.5754 389.76 0.9995 2.11% 383.7 0.9757 374.4 96.05%

System efficiency at VIN=110V RMS

Vin(V) Iin(A) Pin(W) PF THDi Vout(V) Iout(A) Pout(W) Efficiency

220.03 0.9102 193.14 0.9643 7.80% 383.4 0.4863 186.4 96.53%

219.76 1.7589 381.71 0.9874 3.70% 383.6 0.9752 374.1 98.00%

219.48 2.6121 571.08 0.996 2.80% 383.8 1.4604 560.5 98.15%

219.19 3.4696 759.37 0.9984 2.60% 383.7 1.9402 744.5 98.04%

System efficiency at VIN=220V RMS

0.9988 0.9995

0.9643

0.9874

0.996

0.9984

0.94

0.95

0.96

0.97

0.98

0.99

1

195 390 571 759

110V

220V

Power Factor value curve

2.88% 2.22%

14.30%

10.22%

6.62%

4.83%

0.00%

2.00%

4.00%

6.00%

8.00%

10.00%

12.00%

14.00%

16.00%

195 390 571 759

110V

220V

Figure 37. Total Harmonic Distortion value curve of input current

5. Performance result

0.9988 0.9995

0.9643

0.9874

0.996

0.9984

0.94

0.95

0.96

0.97

0.98

0.99

1

195 390 571 759

110V

220V

Power Factor(PF) value curve

96.01% 96.05%

96.53%

98.00% 98.15%98.04%

94.50%

95.00%

95.50%

96.00%

96.50%

97.00%

97.50%

98.00%

98.50%

195 390 571 759

110V

220V

Efficiency curve

(with EMC circuits)

Input current of 110V input

voltage with 360W

Input current of 220V input

voltage with 730W

2.88% 2.22%

14.30%

10.22%

6.62%

4.83%

0.00%

2.00%

4.00%

6.00%

8.00%

10.00%

12.00%

14.00%

16.00%

195 390 571 759

110V

220V

Total Harmonic Distortion(THDi) value curve