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