Method and device for diagnosing connection errors between a driver circuit and an electric machine
A circuit and triggering circuit technology, applied in the direction of motor generator testing, measuring devices, measuring electricity, etc., can solve the problem of inability to distinguish whether there is a physical interruption in the circuit connection
Inactive Publication Date: 2011-08-17
ROBERT BOSCH GMBH
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It is therefore impossible to tell if there is a physical break in the circuit connection, or if all power transistors are normally turned on in response to the trigger so that the circuit connection is not open
Method used
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[0045] exist figure 1 A motor system 1 is shown in , in which the motor is designed as a three-phase AC motor 2 . The winding coils 3 of the three-phase AC motor 2 are connected in a star circuit. Certainly, the winding coil 3 may also adopt other connection methods, such as a delta connection method.
[0046] Each phase U, V, W of the three-phase AC motor 2 has its own terminal (Anschluss), each phase is connected to the corresponding trigger circuit, in particular to the inverter circuit 5U, 5V, 5W of the power stage 4 respectively connect. The power stage 4 is used to provide driving electric energy for the three-phase AC motor 2 . The inverter circuits 5U, 5V, 5W of the power stage 4 each have first power transistors 6U, 6V, 6W as power switches, which are referred to below as high-side transistors. Further, each inverter circuit 5U, 5V, 5W has another power transistor 7U, 7V, 7W as a power switch respectively, and these power switches are referred to as low-side trans...
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The invention relates to a method for detecting an interruption of a line connection (10; 13) between a power stage (4; 24), comprising a plurality of trigger circuits (5U, 5V, 5W; 25U, 25V, 25W) adapted to selectively apply one or one or more established potentials at an output of the respective trigger circuit (5U, 5V, 5W; 25U, 25V, 25W) or to disconnect the output of the respective trigger circuit (5U, 5V, 5W; 25U, 25V, 25W) from the established potentials, and an electric machine (2; 22) comprising a plurality of phase windings connected together, said windings being able to be contacted through phase connections, wherein the output of each of the trigger circuits (5U, 5V, 5W; 25U, 25V, 25W) is connected to a phase connection, respectively, by way of a corresponding connection line (10; 30), said method comprising the following steps: applying (S1) an established potential at at least one output of the respective trigger circuits (5U, 5V, 5W; 25U, 25V, 25W); executing a detection for detecting a detection potential that depends on the potential at one of the outputs of the trigger circuits (5U, 5V, 5W; 25U, 25V, 25W) or on the potentials at more than one of the outputs of the trigger circuits (5U, 5V, 5W; 25U, 25V, 25W); and establishing that an interruption of at least one of the line connections (10; 30) between the power stage (4; 24) and the electric machine (2; 22) exists, depending on the results of the detection.
Description
technical field [0001] The invention relates to a method for identifying whether the connecting wire between the drive circuit and the motor, especially a three-phase AC motor, is disconnected, and in addition, the invention also relates to a device for realizing the method. Background technique [0002] Polyphase motors, such as three-phase AC motors, are usually activated by means of a so-called inverter power stage. For each phase of the motor, the inverter power stage has two independently triggerable electronic power switches in the form of, for example, power transistors, insulated gate bipolar transistors (IGBTs), etc. One of the power switches assigned to a certain phase is connected to a high supply potential, while the other power switch assigned to this phase is connected to a low supply potential. Between the two power switches there are terminals for connecting the phase terminals belonging to the electric motor. [0003] The electronic power switches are trig...
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IPC IPC(8): G01R31/02G01R31/58
CPCG01R31/026G01R31/34G01R31/42G01R31/54G01R31/52G01R31/58
Inventor M-J.霍夫曼L-D.林策
Owner ROBERT BOSCH GMBH