US 12,461,153 B2
Safety fault interrupter circuit with power fault monitor
Robert Mason Hanrahan, Montvale, NJ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Nov. 27, 2023, as Appl. No. 18/519,496.
Application 18/519,496 is a continuation of application No. 17/407,253, filed on Aug. 20, 2021, granted, now 11,867,761.
Application 17/407,253 is a continuation of application No. 16/189,431, filed on Nov. 13, 2018, granted, now 11,125,820, issued on Sep. 21, 2021.
Claims priority of provisional application 62/662,451, filed on Apr. 25, 2018.
Prior Publication US 2024/0085479 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H02H 3/16 (2006.01); G01R 31/327 (2006.01); H02H 3/33 (2006.01); G01R 19/165 (2006.01)
CPC G01R 31/3274 (2013.01) [G01R 31/3275 (2013.01); H02H 3/162 (2013.01); H02H 3/335 (2013.01); G01R 19/16547 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An integrated circuit that comprises:
a safety fault monitor circuit having a first input, a second input, and a third input configured to receive a first DC voltage; and
a power fault monitor circuit coupled to the third input of the safety fault monitor circuit, the second input of the safety fault monitor circuit, and an output of the safety fault monitor circuit, and the power fault monitor circuit includes:
a voltage sense circuit configured to compare the first DC voltage on the third input and a second DC voltage on a second input, and to determine a comparison result; and
a switch operated based on the comparison result;
in which:
the first DC voltage is provided from a switch-mode power supply (SMPS), and the second DC voltage is provided via a resistor-capacitor (RC) circuit coupled to an input side of the SMPS.