dsPIC33C DUAL ACTIVE BRIDGE DEVELOPMENT BOARD: CAN data structure
Data from dsPIC33CK to PC / Power Board Visualizer
The dsPIC33CK will send a 64 byte CAN frame to the PC periodically. The data contained in each byte is shown in Table 1. CAN ID 0x404 is used.
Table 1: CAN frame data bytes from dsPIC to PC
|
16-bit word |
Description |
notes |
scaling for LV hardware |
Display Units |
|
0 |
State |
See Table 2 |
|
|
|
1 |
Status Flag |
See Table 3 |
|
|
|
2 |
Primary Voltage |
|
0.2229 |
V |
|
3 |
Secondary Voltage |
|
0.253353 |
|
|
4 |
Primary Current |
|
0.009765625 |
A |
|
5 |
Secondary Current (CT) |
|
0.012207 |
A |
|
6 |
Secondary Current (Current Sensor) |
|
0.032227 |
A |
|
7 |
Temperature |
|
1 |
˚C |
|
8 |
5V rail |
|
0.001611328 |
V |
|
9 |
Primary to Secondary Phase |
|
0.1 |
Degrees (˚) |
|
10 |
Not used |
|
|
|
|
11 |
Not used |
|
|
|
|
12 |
Switching Period |
|
0.00025 |
us |
|
13 |
Switching Period Target |
|
0.00025 |
us |
|
14 |
Power |
|
1 |
W |
Table 2 shows the state/value relationship for the DAB state machine bytes.
Table 2: state/value relationship for PFC controller state word
|
values |
state |
|
1 |
PCS_INIT |
|
2 |
PCS_WAIT_IF_FAULT_ACTIVE |
|
4 |
PCS_STANDBY |
|
8 |
PCS_SOFT_START |
|
16 |
PCS_UP_AND_RUNNING |
Table 3 shows the bits in the “Status flags” word.
Table 3: bits in the "Vac status" word
|
bit |
Description |
|
0 |
Enabled |
|
1 |
Running |
|
2 |
Fault Active |
|
3 |
Primary OVP |
|
4 |
Not used |
|
5 |
Secondary OVP |
|
6 |
Not Used |
|
7 |
Primary OCP |
|
8 |
Secondary OCP |
|
9 |
Current SCP |
|
10 |
Temperature OTP |
|
11 |
5V rail UVP |
|
12 |
Not used |
|
13 |
Not used |
|
14 |
Not used |
|
15 |
Not used |
Data from PC/Power Board Visualizer to dsPIC33CK
· A button on PBV is required to turn / off the PFC.
· A slider on PBV is required to control the output voltage setpoint.
CAN ID 0x402 is used for both.
8 bytes are sent.
Buttons
Table 4: data sent when certain buttons are activated
|
Byte 1 |
Byte 2 |
description |
|
0x55 |
0x00 |
Stop PFC |
|
0x55 |
0x01 |
Start PFC |
Output Current Reference Slider
Table 5: data sent when Vout reference slider is activated
|
Byte 0 |
Byte 1 Command |
Byte 2 |
Byte 3 |
description |
|
0xDD |
0xDD |
Iout ref, |
Iout ref, |
Set output current reference ADC scaling: 31.03 |
Output Voltage Reference Slider
Table 6: data sent when Vout reference slider is activated
|
Byte 0 |
Byte 1 Command |
Byte 2 |
Byte 3 |
description |
|
0xDD |
0xDE |
Vout ref, |
Vout ref, |
Set output voltage reference ADC scaling: 3.947 |
Output Power Reference Slider
Table 7: data sent when Vout reference slider is activated
|
Byte 0 |
Byte 1 Command |
Byte 2 |
Byte 3 |
description |
|
0xDD |
0xDF |
Pout ref, |
Pout ref, |
Set output power reference ADC scaling: 1 |