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AN2946 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce AN2946
Description  Solar-LED streetlight controller with 25 W LED lamp driver
PDF  38 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2946 Fiches technique(HTML) 21 Page - STMicroelectronics

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AN2946
Firmware design
Doc ID 15473 Rev 2
21/38
4
Firmware design
In accordance with the main functions of the controller described in Section 2.4, solar-LED
lamp controller firmware also consists of the following 3 main modules:
●
Battery charging management
●
LED lamp driving management
●
System monitoring circuit
The main loop in Section 4.1 coordinates the above 3 function modules. All the reference
parameters are listed in Table 4.
Table 4.
Firmware reference parameters
Parameter
Value
Description
USC-th1
7.0 V
Lower threshold of solar cell cathode voltage
USC-th2
15.0 V
Upper threshold of solar cell cathode voltage
USCth
5.0 V
Solar cell voltage threshold for detecting day and night
UBATth1
10.0 V
Lower limit voltage for battery
UBATth2
11.0 V
Empty charge voltage for battery
UBATth3
13.8 V
Full charge voltage for battery
UBATth4
14.5 V
Upper limit voltage for battery
ULEDth
13.0 V
Upper limit voltage for LED
ISCth
0.5 A
Current threshold for switching on/off KCHG
IBATth1
0.5 A
Charging current for battery (deep discharge)
IBATth2
8.0 A
Upper limit of charging current for battery
ILEDth1
2.0 A
Current for LED (LP mode)
ILEDth2
2.45 A
Nominal current for LED
ILEDth3
2.8 A
Upper limit current for LED
TCHGth1
60 ºC
Recovery temperature for battery charger
TCHGth2
90 ºC
Upper limit temperature for battery charger
TBATth1
30 ºC
Recovery temperature for battery
TBATth2
45 ºC
Upper limit temperature for battery
TDRVth1
60 ºC
Recovery temperature for LED driver
TDRVth2
90 ºC
Upper limit temperature for LED driver
TLEDth1
80 ºC
Threshold temperature to enter LP mode for LED
TLEDth2
100 ºC
Upper limit temperature for LED
Timth1
1 sec
Cool down period for recovery
Timth2
1 min
Continuous sensing time for day & night judgment
Timth3
1 ms
Response time of PWM output
Timth4
10 min
MPPT self-calibration time interval



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