In the watch view, check if the
BT2PH_InputVoltageSense_V is between 12 V – 15 V in the Expression
Window.
Set the following parameters from the
Expression Window:
Set the
BT2PH_enableRelay_bool to 1 to enable the output
relay.
BT2PH_userParam_V_I_chm->iref_A = 30.0.
BT2PH_userParam_V_I_chm->vrefCharge_V = 0.12.
Set the
BT2PH_userParam_V_I_ch1->en_bool = 1.
See the Figure 3-25 for the Expression Window settings.
BT2PH_measureMultiphase_V_I variable shows output
current and voltage of the DC/DC converter. Vbatsense_V display value is
close to vrefCharge_V with ±0.5-mV error.
Figure 3-26 shows the SFRA setup to measure Closed-Loop Voltage Control Frequency
Response.
Click on the Run SFRA icon from the
SYSCONFIG page. The SFRA GUI pops up
Select the options for the device on the SFRA
GUI; for example, for F280039, select floating point. Click the Setup
Connection button. In the pop-up window, uncheck the boot-on-connect
option and select an appropriate COM port. Click Ok. Return to the SFRA GUI
and select the Connect button.
The SFRA GUI connects to the device. An SFRA
sweep can now be started by clicking the Start Sweep button. The
complete SFRA sweep takes a few minutes to finish. Once complete, a graph
with the measurement appears, as shown in Figure 3-27.
The Frequency Response Data is saved in the
project folder, under an SFRA Data Folder, and is time-stamped with the time
of the SFRA run.
Figure 3-25 Lab 4 Expression Window,
Closed Loop
Figure 3-26 SFRA Setup for Closed-Loop
Voltage Control
Figure 3-27 Voltage Control Closed-Loop
Frequency Response