Method and device for operating an inverter
AssigneeRobert Bosch GmbH
InventorJochen Kuehner
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Abstract
The invention relates to a method (400) for operating an inverter (110), comprising the steps of: —controlling (450) the inverter (110) for transferring the inverter (110), the intermediate circuit capacitor (140) and the electric machine (190) into a safe state, in particular into a free-wheeling mode (FW). The method is characterized by the following steps: determining (460) a cut-off vector; controlling (470) the inverter (110) corresponding to the cut-off vector; determining (480) the three phase currents (Iu, Iv, Iw) of the electric machine (190); controlling (490) the inverter (110) into the free-wheeling mode (FW) if the three phase currents (Iu, Iv, Iw) determined fall below a predefined current threshold value (Is).
Claims11
Method (400) for operating an inverter (110), wherein the inverter (110) is connected on an input side to an intermediate circuit capacitor (140) and is connected on an output side to an electrically energized three-phase machine (190), wherein the electric machine (190) is operated in a first operating mode (B1) or in a second operating mode (B2), the method comprising:
- controlling (450) of the inverter (110) for transferring the inverter (110), the intermediate circuit capacitor (140) and the electric machine (190) into a free-wheeling mode (FW),
- wherein
- controlling (450) the inverter (110) for transferring is performed via a first sequence of steps, wherein the first sequence of steps comprises the steps of:
- determining (460) a cut-off vector which is a voltage or current vector in which only one switch element on one half-bridge or one switch element on each of two half-bridges is closed and all remaining switch elements of the three half-bridges open,
- controlling (470) the inverter (110) corresponding to the cut-off vector,
- determining (480) three phase currents (lu, Iv, Iw) of the electric machine (190), and
- controlling (490) the inverter (110) to free-wheeling mode (FW) if the three phase currents (lu, Iv, Iw) determined fall below a predefinable current threshold (Is).
A device (130) for operating an inverter (110), wherein the inverter (110) is configured to be connected on an input side to an intermediate circuit capacitor (140) and on an output side to an electrically energized three-phase machine (190), wherein the electric machine (190) is configured to be operated in a first operating mode (B1), or in a second operating mode (B2), wherein the device (130) is configured to control the inverter (110) for transferring the inverter (110), the intermediate circuit capacitor (140) and the electric machine (190) into a free-wheeling mode (FW),
- wherein
- the device (130) is configured to perform the controlling (450) of the inverter for transferring by means of a first sequence of steps,
- wherein the first sequence of steps comprises:
- determining a cut-off vector (460) which is a voltage or current vector in which only one switch element on one half-bridge or one switch element on each of two half-bridges is closed and all remaining switch elements of the three half-bridges open,
- controlling (470) the inverter (110) corresponding to the cut-off vector,
- determining three phase currents (lu, Iv, Iw) of the electric machine (190),
- switching the inverter (110) to free-wheeling mode (FW) if the determined three phase currents (lu, Iv, Iw) fall below a predefinable current threshold value (Is).
A drive train (200) comprising a device (130) for operating an inverter (110), wherein the inverter (110) is configured to be connected on an input side to an intermediate circuit capacitor (140) and on an output side to an electrically energized three-phase machine (190), wherein the electric machine (190) is configured to be operated in a first operating mode (B1), or in a second operating mode (B2), wherein the device (130) is configured to control the inverter (110) for transferring the inverter (110), the intermediate circuit capacitor (140) and the electric machine (190) into a free-wheeling mode (FW),
- wherein
- the device (130) is configured to perform the controlling (450) of the inverter for transferring by means of a first sequence of steps,
- wherein the first sequence of steps comprises:
- determining a cut-off vector (460) which is a voltage or current vector in which only one switch element on one half-bridge or one switch element on each of two half-bridges is closed and all remaining switch elements of the three half-bridges open,
- controlling (470) the inverter (110) corresponding to the cut-off vector,
- determining three phase currents (lu, Iv, Iw) of the electric machine (190),
- switching the inverter (110) to free-wheeling mode (FW) if the determined three phase currents (lu, Iv, Iw) fall below a predefinable current threshold value (Is).
A non-transitory, computer-readable storage medium comprising commands which, when executed by a computer, cause the computer to operate an inverter (110), wherein the inverter (110) is connected on an input side to an intermediate circuit capacitor (140) and is connected on an output side to an electrically energized three-phase machine (190), wherein the electric machine (190) is operated in a first operating mode (B1) or in a second operating mode (B2), by:
- controlling (450) of the inverter (110) for transferring the inverter (110), the intermediate circuit capacitor (140) and the electric machine (190) into a free-wheeling mode (FW),
- wherein
- controlling (450) the inverter (110) for transferring is performed via a first sequence of steps, wherein the first sequence of steps comprises the steps of:
- determining (460) a cut-off vector which is a voltage or current vector in which only one switch element on one half-bridge or one switch element on each of two half-bridges is closed and all remaining switch elements of the three half-bridges open,
- controlling (470) the inverter (110) corresponding to the cut-off vector,
- determining (480) three phase currents (lu, Iv, Iw) of the electric machine (190), and
- controlling (490) the inverter (110) to free-wheeling mode (FW) if the three phase currents (lu, Iv, Iw) determined fall below a predefinable current threshold (Is).
Dependencies are inferred from the claim text.