US 12,476,467 B1
Interconnection between household microgrid and utility grid
Daqing Wang, Shenzhen (CN); Gang Xiao, Shenzhen (CN); Ke Bi, San Jose, CA (US); Cheung (Gary) Lam, San Jose, CA (US); Douglas Amarhanow, San Jose, CA (US); Qing Zhang, Shenzhen (CN); Tao Wang, Shenzhen (CN); Lianyan Cai, Shenzhen (CN); Yanxiang Wang, Shenzhen (CN); Mingfeng Li, Shenzhen (CN); Dongcai Tang, Shenzhen (CN); Jingming Leng, Shenzhen (CN); and Long Chen, Shenzhen (CN)
Assigned to Franklin WH Energy Storage Inc., San Jose, CA (US)
Filed by FranklinWH Energy Storage Inc., San Jose, CA (US)
Filed on Nov. 19, 2024, as Appl. No. 18/952,659.
Claims priority of provisional application 63/664,781, filed on Jun. 27, 2024.
Claims priority of provisional application 63/664,725, filed on Jun. 27, 2024.
Claims priority of provisional application 63/641,139, filed on May 1, 2024.
Int. Cl. H02J 3/38 (2006.01); G01R 22/06 (2006.01)
CPC H02J 3/381 (2013.01) [G01R 22/061 (2013.01); H02J 2203/10 (2020.01); H02J 2310/12 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A meter socket adapter (MSA) for connecting a battery energy storage system (BESS) to a household microgrid through a meter combo load center, comprising:
a housing matching an electricity meter and a meter socket in the meter combo load center;
a plurality of power conductors that connect among the electricity meter, the meter socket, and the BESS;
a meter interconnection device (MID) switch for connecting a utility grid or one or more distribution energy resource (DER) devices to supply power to household loads in the household microgrid;
a MID driving circuit for driving the MID switch to close or open; and
a MID connection detection circuit to verify an electrical connection of a closed MID switch, wherein the MID connection detection circuit is configured to:
connect a probe circuit in parallel with the MID switch, the probe circuit including a capacitor, a resistor, and a secondary coil of a transformer that are connected in series;
apply a first high-frequency current signal at a primary coil of the transformer to obtain a second high-frequency current signal at a secondary coil of the transformer in response to the MID switch being in a closed state, wherein the first high-frequency current signal and the second high-frequency current signal have a same frequency, and the second high-frequency signal circulates in a loop formed by the probe circuit and the MID switch;
obtain a third high-frequency current signal through a current transformer (CT) from the loop formed by the probe circuit and the MID switch;
feed the third high-frequency current signal into a detection circuit to obtain a voltage signal; and
based on the voltage signal, determine whether the MID switch is electrically closed.