SBOA624 March   2025 TMCS1123 , TMCS1126 , TMCS1127 , TMCS1133

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Solar Application Scenarios with Hall-effect Current Sensing
    1. 2.1 String Inverter
      1. 2.1.1 String Current Sampling
      2. 2.1.2 Arc Current Detection (Optional)
      3. 2.1.3 MPPT Boost Current Sampling
      4. 2.1.4 3-Phase Current Sampling
    2. 2.2 Single-Phase Residential Inverter
    3. 2.3 3-Phase Hybrid Inverter
      1. 2.3.1 BDC Current Sampling
      2. 2.3.2 Off-Grid EPS 3-Phase Current Sampling
      3. 2.3.3 Neutral Current Sampling for Midpoint Potential Balancing
    4. 2.4 Split-Phase Hybrid Inverter
    5. 2.5 Micro Inverter
    6. 2.6 Solar Power Optimizer
    7. 2.7 Smart Combiner Box of Central Inverter
    8. 2.8 Summary of Solar Inverter System and In-package Hall-effect Current Sensor
  6. 3Summary
  7. 4References

2.8 Summary of Solar Inverter System and In-package Hall-effect Current Sensor

Table 2-1 summarizes solar inverter system with the key information to help analyze in-package hall-effect current sensor usage, as shown in Table 2-2.

Table 2-1 Summary of Solar Inverter System
Solar Inverter System String Inverter Residential Inverter Hybrid Inverter
Phase type 3-phase 3-phase 1-phase 3-phase Split-phase 1-phase
Power level Typ. 100 to 320KW Typ. 5 to 50KW Typ.3 to 10KW Typ. 5 to 25KW Typ. 5 to 10KW Typ. 3 to 6KW
Bus voltage Typ. 1100V/1500V Typ. 1100V Typ. 600V Typ. 1000V Typ. 600V Typ. 600V
No. of independent MPPT K (Typ.9/12/14/16) K (Typ.2/3/4) K (Typ.1/2/3) K (Typ. 2/3) K (Typ. 2/3/4) K (Typ. 2)
No. of PV strings per MPPT Typ. 2 Typ. 2/1 Typ. 1 Typ. 2/1 Typ. 2/1 Typ. 1
No. of total PV strings J (Typ.18/24/28/32) J (Typ.2/3/4/5/6/7/8) J (Typ.1/2/3) J (Typ. 2/3/5) J (Typ. 4/6) J (Typ. 2)
No. of BDC N/A N/A N/A M (Typ. 2/3) M (Typ. 1/2) M (Typ. 1)
Neutral current sampling (Y/N) No No No Yes Yes No
Off-grid EPS (Y/N) No No No Yes Yes Yes
Table 2-2 In-package Hall-effect Current Sensor Usage Statistics
Where Used String Inverter Residential Inverter Hybrid Inverter
MPPT Boost current K K K K K K
String current J-K J-K J-K J-K J-K J-K
Inverter phase current (1) 3 3 1 3 2 1
Off-grid EPS current N/A N/A N/A 3 2 1
BDC Buck/Boost current (2) N/A N/A N/A M M M
Neutral current N/A N/A N/A 1 1 N/A
Total Quantities (3) J+3 J+3 J+1 J+M+7 J+M+5 J+M+2
Note:
  1. For inverter phase current sampling, whether in-package hall-effect current sensors can be used or not depends on the power level (current rating) of the inverter. In-package hall-effect current sensors can have thermal issues in high power inverters.
  2. The table data is based on Buck/Boost BDC of inverter with high voltage battery. Isolated topology such as DAB and CLLLC, and so on of inverter with low voltage battery have more current sensors are not shown in this table.
  3. Diesel generator and arc detection are optional functions, the corresponding current sensor quantities are not included in the total quantities. There has extra off-grid phase current sampling of the diesel generator port. The quantities for arc current sensors are equal to the number of total PV strings.

Table 2-3 and Table 2-4 show examples.

Table 2-3 Solar Inverter System Examples
Solar Inverter Systems String Inverter Residential Inverter Hybrid Inverter
Phase type 3-phase 3-phase 1-phase 3-phase Split-phase 1-phase
Power level 320KW 25KW 8KW 20KW 10KW 5KW
Bus voltage 1500V 1100V 600V Typ. 1000V 600V 600V
No. of independent MPPT K = 16 K = 3 K = 2 K = 3 K = 4 K = 2
No. of PV strings per MPPT 2 2 2/1 2/2/1 1 1/1
No. of total PV strings J = 32 J = 6 J = 3 J = 5 J = 4 J = 2
No. of BDC N/A N/A N/A M = 3 M = 2 M = 1
Neutral current sampling (Y/N) No No No Yes Yes No
Off-grid EPS (Y/N) No No No Yes Yes Yes
Table 2-4 Examples of In-package Hall-effect Current Sensor Usage Statistics
Where Used String Inverter Residential Inverter Hybrid Inverter
MPPT Boost current K = 16 K = 3 K = 2 K = 3 K = 4 K = 2
String current J-K = 16 J-K = 3 J-K = 1 J-K = 2 J-K = 0 J-K = 0
Inverter phase current 3 3 1 3 2 1
Off-grid EPS current N/A N/A N/A 3 2 1
BDC Buck/Boost current N/A N/A N/A M = 3 M = 2 M = 1
Neutral current N/A N/A N/A 1 1 N/A
Total Quantities J+3 = 35 J+3 = 9 J+1 = 4 J+M+7 = 15 J+M+5 = 11 J+M+2 = 5