Recent Posts

Why not split the solar array in half ? take care of the max power input in your inverter but it would have less losses than shunts.

Thank you for invitation. Registration is done.



Note: This message sent by the system behalf of Alx.

I have a solar array with an open circuit voltage of 640V and a maximum power point voltage of 510V and a charge controller that can tolerate up to 550V input.  So, I'm trying to figure out the best way to limit the voltage to 550V.  In practice, the array would only exceed 550V during unusual conditions (such as very cold and high intensity sun such as immediately after a storm). 

The array has a maximum output current of 10 A (about 5 kw).  The simplest solution seems to be a shunt regulator.  The simplest form may be a string of series connected high power (50 watt) zener diodes with the combined breakdown voltage a bit under 550V.  The shunt regulator would never need to dissipate the full output power of the array since even a modest load (10-20%?) should drop the voltage below the 550V threshold.  I have minimal experience with high voltage electronics.  Anyone have any ideas or experience with this?   

This member is invited by me. Registration isn't completed yet.


Note: This message sent by the system behalf of Catcatcat.

[Country]

Country	usa
Note	I am an electronics engineer And I love programming and building hardware I am skilled in building and programming electronic devices I can answer specialized questions in the field of programming PIC, AVR microcontrollers, and hardware design. The purpose of becoming a member is to share experience and benefit from the experiences of friends. Electronics is my job and I enjoy it

I had a look around, but failed to find anything.

Without the full detail, these are chips I'd avoid.

looking for following uC

SC8F072AD614SP
SC8P062AD614SP
SC8P1711E      
SC8P1762E      

CMS80F2313
CMS80F2316
CMS80F2317         
CMS80F7316
CMS80F7318
CMS80F7616
CMS80F7618

PMS134
PFS122B
PGS134
PFS154

This will be right:

Code:

.text
...
.section coeff,psv
COEFF_A: .hword  0x4000,0x8F5B,0x4BB5,0xEE34
COEFF_B: .hword  0x2511,0x6F33,0x6F33,0x2511
.end

I apologize in advance if my question is inappropriate here.
I'm trying to write code in xc16 assembler. I don't understand how to place constants in program memory. In theory, you just need to place data in the program area (after the .text directive). But if I do this:

Code:

.text
...
COEFF_A: .hword  0x4000,0x8F5B,0x4BB5,0xEE34
COEFF_B: .hword  0x2511,0x6F33,0x6F33,0x2511
.end

Then the compiler perceives the labels COEFF_A and COEFF_B as invalid assembler instructions.
If I do this:

Code:

.text
...
.data
COEFF_A: .hword  0x4000,0x8F5B,0x4BB5,0xEE34
COEFF_B: .hword  0x2511,0x6F33,0x6F33,0x2511
.end

The compiler places constants in the data area.  
Tell me what I'm doing wrong?

Posted on: May 07, 2025, 09:59:15 09:59 - Automerged
If I do this:

Code:

.text
...
.section .const
COEFF_A: .hword  0x4000,0x8F5B,0x4BB5,0xEE34
COEFF_B: .hword  0x2511,0x6F33,0x6F33,0x2511
.end

The data seems to appear in the program memory area. But in my opinion, this is not quite the correct syntax.

Unlikely you'll find a single repository for all Chinese uC programming protocols  

When I've looked at using one of the Chinese devices, I've always first tried to collect all relevant programming information. If I can't find it, I don't use the part.

But, after some deep searching, and often a lot of frustration with my inability to speak the language and manufacturers poor translations, I normally find something.

Are you after details of any specific part?