Part Number: TIDA-00961
Dear Salil, Dear Hrishi, Dear Texas Instruments Team,
I have got several questions to the TIDA-00961 PFC:
1) In the schematics, there is R231, R232 and R234 all connected to the same point. I assume this is to allow different options. The values with 1M are not really used. So ZVS2 and ZVS2_2 is not used. The same with R229, 230 and R233?
2) There are two signals CT_SENSE1 and CT_SENSE2. Are they used with current transformers? In the BOM I could not see current transformers.
3) The G_AC_I is not used in software and also not in hardware. The U204 and R221 cannot influence the U207 output. Only R222 and R224 take full control.
4) In the schematic, I think the J205 is drawn incorrectly. It is mirrored some way.
5) I did not find bulk capacitors in the schematic. Did you use external bulk capacitors? Hiw much uF? Which load did you use to run the PFC? What is the maximal resistance value (lowest load) that can be used?
6) Do you have got control software that you can provide and which comes along with the TIDA-PFC? In your code, you write
//GUI support variables
// sets a limit on the amount of external GUI controls - increase as necessary
volatile int16_t *varSetTxtList[16]; //16 textbox controlled variables
Can you provide the GUI for the PFC?
7) Can you provide some pictures of your test setup of TIDA-00961?
Many thanks in advance for your reply
Best regards
Patrick
Dear "Watermelon Noodles",
currently I try to build my own version of TIDA-00961 for evaluation purposes of the GaN-MOSFETs.
Many thanks for your reply.
3) The G_AC_I in your hardware will not work. The U204 is useless.
4) The connector consists of two parts. The small part goes from 1 to 56 and the big part from 57 to 120. This is incorrect in the schematic. In the schematic, there is the big part going from 1 to 64 and the small part from 65 to 120.
5) 390V, 4.1A is the maximal value. So the resistance should be no less than 95 Ohms? Good to know this. What about the minimal value?
7) In particular I want to ask what is this big black cylinder? Is it the bulk capacitor I assume?
And I have got another question
8) Is there general advice you can give to set up this PCB? Are there tests to do before connecting it the the mains grid you can recommend? In the code I found a variable called "DC_CHECK". Is this a test I can do with DC voltage before connecting the unit to the mains (230V, 50Hz)?
Many thanks and best regards
Patrick
Hi, patrick
as below:
3) The G_AC_I in your hardware will not work. The U204 is useless. Ans: this part should be used in BoM. but you can leave it alone in high line.
4) The connector consists of two parts. The small part goes from 1 to 56 and the big part from 57 to 120. This is incorrect in the schematic. In the schematic, there is the big part going from 1 to 64 and the small part from 65 to 120. Ans: you should not look the schmetics symbol, you should refer to the PCB footprint.
5) 390V, 4.1A is the maximal value. So the resistance should be no less than 95 Ohms? Good to know this. What about the minimal value? Ans: there is no up limit, it canbe open circuits.
7) In particular I want to ask what is this big black cylinder? Is it the bulk capacitor I assume? Ans: it is the bulk cap for test.
And I have got another question
8) Is there general advice you can give to set up this PCB? Are there tests to do before connecting it the the mains grid you can recommend? In the code I found a variable called "DC_CHECK". Is this a test I can do with DC voltage before connecting the unit to the mains (230V, 50Hz)?
Ans: you can follow this step,
1, check your control circuits, -- all Vcc bias, MCU JTAG, PWM wave, OPAMP, driver.
2, check your power stage can work well with DC input and open loop condition;
3, check your sensing circuits, make sure all sensing signal is correct.
4, ac input with 110V 0.2A load condition; (you can adjust the input from 0V to 110V slowly first time)
5, ac input with 230V 0.2A load condition; (you can adjust the input from 110V to 230V slowly first time)
hope it is helpful!
