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charge_control: block charging if external temperature is too low

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This commit is contained in:
Thomas Kolb 2022-10-15 21:44:27 +02:00
parent d7b8c90cb4
commit 5c6497fb82
2 changed files with 47 additions and 11 deletions
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49
src/charge_control.c
View file

@ -2,6 +2,7 @@
#include <fxp.h>
#include "bmp280.h"
#include "power_switch.h"
#include "measurement.h"
#include "charge_pump.h"
@ -10,17 +11,18 @@
#include "charge_control.h"
static const char *CHARGE_STATE_TEXT[] = {
static const char *CHARGE_STATE_TEXT[CHARGE_NUM_STATES] = {
"WAIT_CHARGEPUMP",
"INITIAL",
"INITIAL_HOLD",
"TRANSITION",
"FLOAT",
"SLEEP",
"HIGH_TEMPERATURE"
"HIGH_INTERNAL_TEMPERATURE",
"LOW_EXTERNAL_TEMPERATURE"
};
static const char *DISCHARGE_STATE_TEXT[] = {
static const char *DISCHARGE_STATE_TEXT[DISCHARGE_NUM_STATES] = {
"WAIT_CHARGEPUMP",
"OK",
"VOLTAGE_LOW",
@ -56,6 +58,9 @@ static fxp_t load_current_limit;
static fxp_t internal_temperature_limit;
static fxp_t internal_temperature_recovery;
static fxp_t external_temperature_limit;
static fxp_t external_temperature_recovery;
static fxp_t sleep_solar_current;
static fxp_t sleep_solar_excess_voltage;
@ -86,9 +91,15 @@ static enum ChargeState control_solar_charging(
solar_switch_onoff_duration = 0;
}
// temperature limit
// internal temperature limit: prevent overheating of the power transistors.
if(meas->avg_temperature > internal_temperature_limit) {
return CHARGE_HIGH_TEMPERATURE;
return CHARGE_HIGH_INTERNAL_TEMPERATURE;
}
// external temperature limit: prevent charging the battery if temperature is too low.
if(bmp280_are_measurements_valid() &&
bmp280_get_temperature() < external_temperature_limit) {
return CHARGE_LOW_EXTERNAL_TEMPERATURE;
}
// low-current limit (go to sleep at night)
@ -195,7 +206,7 @@ static void solar_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
// temperature limit
if(meas->temperature > internal_temperature_limit) {
charge_state = CHARGE_HIGH_TEMPERATURE;
charge_state = CHARGE_HIGH_INTERNAL_TEMPERATURE;
break;
}
break;
@ -217,7 +228,7 @@ static void solar_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
break;
case CHARGE_HIGH_TEMPERATURE:
case CHARGE_HIGH_INTERNAL_TEMPERATURE:
if(charge_state_entered) {
power_switch_solar_off();
}
@ -228,6 +239,21 @@ static void solar_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
}
break;
case CHARGE_LOW_EXTERNAL_TEMPERATURE:
if(charge_state_entered) {
power_switch_solar_off();
}
// this state can only be entered if the BMP280 measurement is valid, so
// no need to check it again here.
if(bmp280_get_temperature() > external_temperature_recovery) {
charge_state = CHARGE_WAIT_CHARGEPUMP;
break;
}
break;
default:
// unknown state
break;
@ -329,6 +355,9 @@ void charge_control_init(void)
internal_temperature_limit = fxp_div(FXP_FROM_INT(FLASH_CONFIG_INTERNAL_TEMPERATURE_LIMIT), FXP_FROM_INT(10));
internal_temperature_recovery = fxp_div(FXP_FROM_INT(FLASH_CONFIG_INTERNAL_TEMPERATURE_RECOVERY), FXP_FROM_INT(10));
external_temperature_limit = fxp_div(FXP_FROM_INT(FLASH_CONFIG_EXTERNAL_TEMPERATURE_LIMIT), FXP_FROM_INT(10));
external_temperature_recovery = fxp_div(FXP_FROM_INT(FLASH_CONFIG_EXTERNAL_TEMPERATURE_RECOVERY), FXP_FROM_INT(10));
sleep_solar_current = fxp_div(FXP_FROM_INT(FLASH_CONFIG_SLEEP_SOLAR_CURRENT), FXP_FROM_INT(1000));
sleep_solar_excess_voltage = fxp_div(FXP_FROM_INT(FLASH_CONFIG_SLEEP_SOLAR_EXCESS_VOLTAGE), FXP_FROM_INT(1000));
}
@ -381,7 +410,8 @@ void charge_control_update(uint64_t uptime_ms, struct MeasurementResult *meas)
bool charge_control_is_idle(void)
{
return (((charge_state == CHARGE_SLEEP)
|| (charge_state == CHARGE_HIGH_TEMPERATURE))
|| (charge_state == CHARGE_HIGH_INTERNAL_TEMPERATURE)
|| (charge_state == CHARGE_LOW_EXTERNAL_TEMPERATURE))
&& ((discharge_state == DISCHARGE_VOLTAGE_LOW)
|| (discharge_state == DISCHARGE_OVERCURRENT)));
}
@ -390,7 +420,8 @@ bool charge_control_is_idle(void)
bool charge_control_is_charge_blocked(void)
{
switch(charge_state) {
case CHARGE_HIGH_TEMPERATURE:
case CHARGE_HIGH_INTERNAL_TEMPERATURE:
case CHARGE_LOW_EXTERNAL_TEMPERATURE:
case CHARGE_WAIT_CHARGEPUMP:
return true;

9
src/charge_control.h
View file

@ -15,7 +15,10 @@ enum ChargeState
CHARGE_TRANSITION,
CHARGE_FLOAT,
CHARGE_SLEEP,
CHARGE_HIGH_TEMPERATURE
CHARGE_HIGH_INTERNAL_TEMPERATURE,
CHARGE_LOW_EXTERNAL_TEMPERATURE,
CHARGE_NUM_STATES
};
enum DischargeState
@ -23,7 +26,9 @@ enum DischargeState
DISCHARGE_WAIT_CHARGEPUMP,
DISCHARGE_OK,
DISCHARGE_VOLTAGE_LOW,
DISCHARGE_OVERCURRENT
DISCHARGE_OVERCURRENT,
DISCHARGE_NUM_STATES
};
// Error flags