125 lines
2.8 KiB
C++
125 lines
2.8 KiB
C++
/**
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* @file dcdcmbus.ino
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* @brief usage of XY6020L DCDC for simple max power point tracking of
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* a solar module driving a electrolytic cell
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* Cells voltage start from ~3 V and current will rise up to ~3A at 4 V.
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* At ~19 V the 20V pannel has its maximum power.
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* Simple I-controler increases the cell voltage till the power consumption
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* from the solar panel drives its voltage below 19 V.
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Hardware: Arduino Pro Micro Clone from China
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*
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* @author Jens Gleissberg
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* @date 2024
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* @license GNU Lesser General Public License v3.0 or later
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*/
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#include "xy6020l.h"
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#define PIN_SOFTWARE_SERIAL_RX2 25
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#define PIN_SOFTWARE_SERIAL_TX2 26
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// dcdc's MBus is connected to Serial2 of Arduino
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xy6020l xy(Serial2, 1);
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long ts;
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bool boActive;
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// solar panel voltage
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word vIn;
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// cell voltage setpoint
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word vOut, vOutMin, vOutMax;
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void setup() {
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// debug messages via USB
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Serial.begin( 115200);
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// MBus serial
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// Serial2.begin( 115200);
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Serial2.begin(115200, SERIAL_8N1, PIN_SOFTWARE_SERIAL_RX2, PIN_SOFTWARE_SERIAL_TX2); // Rx = 4, Tx = 5 will work for ESP32, S2, S3 and C3
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ts = millis();
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vOutMin= 300; // start with 3,0 V
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vOutMax= 450; // max voltage
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vIn = 1700;
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boActive = false;
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xy.setPreset(01);
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while(!xy.TxBufEmpty())
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xy.task();
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xy.setOutput(false);
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while(!xy.TxBufEmpty())
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xy.task();
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}
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void loop() {
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int vDiff;
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char tmpBuf[30]; // text buffer for serial messages
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xy.task();
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if(xy.HRegUpdated())
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{
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vIn = xy.getInV();
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// 15 V -> undervoltage of solar panel
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if(vIn < 1300 )
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{
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// output off
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xy.setOutput(false);
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boActive = false;
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// reset cell voltage to its min value
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vOut= vOutMin;
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}
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else
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{
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// use a hyseressis for switch on to avoid to short on pulses
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if(vIn > 2100 )
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{
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boActive= true;
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// output on
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if(!xy.getOutputOn() )
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xy.setOutput(true);
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}
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}
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if(xy.getLockOn() )
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xy.setLockOn(false);
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if(xy.getProtect()>0)
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{
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xy.setProtect(0);
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}
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if(boActive)
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{
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// target:
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// the input voltage must be kept at 18..19 V
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// @todo I part depents on voltage difference and slope
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vDiff= (int)vIn - (int)1900;
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// dead band -> no change
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if(vDiff < 70 && vDiff > -100)
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vDiff=0;
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else
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{
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if(vDiff > 200)
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vDiff=200;
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if(vDiff < -200)
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vDiff=-200;
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if(vDiff > 0)
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vOut+= vDiff /10;
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else
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vOut+= vDiff ;
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if(vOut > vOutMax)
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vOut = vOutMax;
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if(vOut < vOutMin)
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vOut = vOutMin;
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xy.setCV( vOut );
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}
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}
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// print control results: - switched to save runtime -
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//sprintf( tmpBuf, "%d: %d Out=%d\n", vIn, vOut, boActive);
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//Serial.print(tmpBuf);
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}
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}
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