US 12,445,035 B2
Method and apparatus for ascertaining a parameter, said parameter characterizing a current or a voltage in a circuit arrangement
Dennis Bura, Renningen (DE); Markus Michels, Stuttgart (DE); and Michael Jiptner, Renningen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 18/041,920
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jul. 20, 2021, PCT No. PCT/EP2021/070222
§ 371(c)(1), (2) Date Feb. 16, 2023,
PCT Pub. No. WO2022/037876, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 10 2020 210 577.4 (DE), filed on Aug. 20, 2020.
Prior Publication US 2023/0327537 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 1/00 (2007.01); H02M 1/08 (2006.01); H02M 3/156 (2006.01)
CPC H02M 1/0058 (2021.05) [H02M 1/0009 (2021.05); H02M 1/083 (2013.01); H02M 3/156 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method (100) for determining a parameter (I_avg, I_N, I_P, V_c), wherein the parameter (I_avg, I_N, I_P, V_c) characterizes a current or a voltage in a circuit arrangement (200),
wherein the circuit arrangement (200) comprises an inductor (L),
wherein an alternating choke current (I_L) flows through the inductor (L), the method comprising the steps of:
determining (120) at least one duration (TN1) between two zero crossings (N_−, N_+) of the choke current (I_L); and
determining (130) the parameter (I_avg, I_N, I_P, V_c) as a function of the determined duration (TN1),
wherein the parameter (I_avg, I_N, I_P) characterizes a current through the inductor (L) in the circuit arrangement (200),
wherein the circuit arrangement (200) comprises at least one half bridge having a first switching element (S1) and a second switching element (S2),
wherein the first switching element (S1) is connected on one side to a first potential (P1) and is connected on the other side to a center tap (M) of the half bridge,
wherein the second switching element (S2) is connected on one side to a second potential (P2) and is connected on the other side to the center tap (M) of the half bridge,
wherein the inductor (L) is connected by a first connection to the center tap (M) and is connected by a second connection to a third potential (P3),
wherein an input voltage (V_in) is present between the first potential (P1) and the third potential (P3),
the method further comprising the steps of:
alternately activating (110) the first and the second switching element (S1, S2) with a specifiable duty cycle (a1), resulting in the alternating choke current (I_L) through the inductor (L);
determining (120) the duration (TN1, TN2) between the zero crossings of the choke current (I_L); and
determining (130) the parameter (I_avg, I_N, I_P) as a function of the input voltage (V_in), the size of the inductor (L), the duty cycle (a1), and the duration (TN1, TN2) between the zero crossings of the choke current (I_L).