US 12,074,473 B2
Changeover device, retrofit kit and method for supplying electrical power to a load
Claus Allert, Kaufungen (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Jul. 18, 2022, as Appl. No. 17/866,741.
Application 17/866,741 is a continuation of application No. PCT/EP2020/086201, filed on Dec. 15, 2020.
Prior Publication US 2022/0352747 A1, Nov. 3, 2022
Int. Cl. H02J 9/06 (2006.01); H02J 3/00 (2006.01); H02J 3/32 (2006.01)
CPC H02J 9/063 (2020.01) [H02J 3/0073 (2020.01); H02J 3/32 (2013.01); H02J 2207/20 (2020.01); H02J 2300/24 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A changeover device for selectively supplying power to at least one load from a grid or a bidirectional inverter, comprising:
an input comprising a grid neutral conductor connection and a grid phase conductor connection, the input configured to connect to the grid;
a first output comprising an inverter neutral conductor connection and an inverter phase conductor connection, the first output configured to connect to an inverter output of the bidirectional inverter;
a second output comprising a load neutral conductor connection and a load phase conductor connection, the second output configured to connect to the load;
a switching circuit, an actuator of which is connected to an actuator input of the changeover device, wherein the switching circuit comprises a first normally closed contact, a second normally closed contact, and a normally open contact, wherein the first normally closed contact has a first grid-side connection and a first inverter-side connection, the second normally closed contact has a second grid-side connection and a first load-side connection, and the normally open contact has a second inverter-side connection and a second load-side connection,
wherein
the grid phase conductor connection is connected to the first grid-side connection and the second grid-side connection,
the inverter phase conductor connection is connected to the first inverter-side connection, and
the load phase conductor connection is connected to the first load-side connection and the second load-side connection,
wherein the changeover device additionally comprises a Secure Power Supply (SPS) connection having an SPS neutral conductor connection and an SPS phase conductor connection configured to connect to a Secure Power Supply (SPS) output of the bidirectional inverter, and
wherein in an operating status of the changeover device only one of the inverter phase conductor connection and the SPS phase conductor connection is active and the other is voltage-free in response to switching circuitry within the bidirectional inverter,
wherein in a first state of the switching circuitry solely the inverter phase conductor connection is voltage free and the SPS phase conductor connection is active, resulting in the actuator being actuated, and thus the first normally closed contact is open, the second normally closed contact is open, and the normally open contact is closed; and
wherein in a second, different state of the switching circuitry solely the SPS phase conductor connection being voltage free and the inverter phase conductor connection is active, resulting in the actuator being not actuated, and thus the first normally closed contact is closed, the second normally closed contact is closed, and the normally open contact is open.