A current detection device (120) including: a current detection unit (200) configured to, on a basis of respective voltage drops of resistance elements (RS1 to RS3) connected in series to lower arm elements of respective phases of a PWM-controlled multiphase inverter (104), detect respective current values of the respective phases; a sum calculation unit (201) configured to calculate an all phase sum of current detection values detected by the current detection unit; a maximum duty phase determination unit (203) configured to determine a phase whose upper arm element is driven at a maximum duty ratio; an output switching unit (204) configured to, when the all phase sum of the current detection values has been determined to be equal to or more than a threshold value, switch a value to be output as a current detection value of a lower arm of the phase whose upper arm element is driven at the maximum duty ratio to a value obtained by inverting a sign of a sum of the current detection values detected in remaining phases by the current detection unit (200); and a threshold value determination unit configured to determine the threshold value in accordance with the all phase sum of the current detection values detected at duty ratios where current detection by the current detection unit is possible.
CURRENT DETECTION DEVICE AND ELECTRIC POWER STEERING DEVICE
STROMERKENNUNGSVORRICHTUNG UND ELEKTRISCHE SERVOLENKVORRICHTUNG
DISPOSITIF DE DÉTECTION DE COURANT ET DISPOSITIF DE DIRECTION ASSISTÉE ÉLECTRIQUE
2020-04-08
Patent
Electronic Resource
English
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B62D MOTOR VEHICLES , Motorfahrzeuge |
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