US 11,955,790 B2
Electronic fuse circuit
Michael Wortberg, Dorfen (DE)
Assigned to Lisa Draexlmaier GmbH, (DE)
Filed by Lisa Draexlmaier GmbH, Vilsbiburg (DE)
Filed on May 19, 2022, as Appl. No. 17/748,349.
Claims priority of application No. 10 2021 113 107.3 (DE), filed on May 20, 2021.
Prior Publication US 2022/0376486 A1, Nov. 24, 2022
Int. Cl. H02H 3/24 (2006.01); H02H 3/08 (2006.01); H02H 3/087 (2006.01); H03K 17/082 (2006.01); B60R 16/03 (2006.01)
CPC H02H 3/243 (2013.01) [H02H 3/085 (2013.01); H02H 3/087 (2013.01); H02H 3/24 (2013.01); H03K 17/0822 (2013.01); B60R 16/03 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electronic fuse circuit for safeguarding a multi-channel electronic power distributor, the electronic fuse circuit comprising:
a driver circuit for each channel of the multi-channel electronic power distributor, wherein the driver circuit is configured to control an electronic switch of a corresponding channel of the multi-channel electronic power distributor to assume a certain state;
a microcontroller interface configured to receive a command for adjusting a state of the electronic switch of each channel of the multi-channel electronic power distributor from a microcontroller, wherein the driver circuit of the corresponding channel is configured to set the state of the electronic switch of the corresponding channel of the multi-channel electronic power distributor according to the command from the microcontroller;
and a safety circuit for detecting a malfunction in at least one of the microcontroller and the multi-channel electronic power distributor,
wherein in response to a detected malfunction in the least one of the microcontroller and the multi-channel electronic power distributor, the driver circuit of each channel is configured to set the state of the electronic switch of the corresponding channel of the multi-channel electronic power distributor according to a channel-specific preconfigured safety state,
the driver circuit of each channel is configured to determine a transient undervoltage at a voltage supply terminal of the corresponding channel based on a detection of a terminal voltage at the voltage supply terminal, and
the safety circuit is configured to switch off the electronic switch of the corresponding channel when the terminal voltage falls below a first switch-off threshold value.