JP6680227B2 - Control device for rotating electric machine - Google Patents

Description

  The present invention relates to a control device for a rotary electric machine including an armature winding and a field winding.

  In a rotary electric machine including an armature winding and a field winding, a configuration is known in which an H bridge circuit is used to control excitation of the field winding. Regarding a switch that constitutes an H-bridge circuit, an excitation switch used when a current flows from the battery to the field winding, and a regeneration switch used when regenerating the field energy accumulated in the field winding to the battery Patent Document 1 discloses a configuration for detecting a switch failure. According to the configuration of Patent Document 1, it is possible to determine the abnormality of each switch that configures the H bridge circuit, and it is possible to continue power generation using a switch different from the switch in which the abnormality has occurred.

Japanese Patent No. 4254738

  During power generation and driving of the rotating electric machine, the field winding is set to an excited state in which a current is supplied from the battery to the field winding and a recirculation state in which the exciting current is circulated. That is, the field winding is brought into a regenerative state in which the field energy is regenerated to the battery only when power generation and driving of the rotating electric machine are completed. That is, in the configuration disclosed in Patent Document 1, the chances of detecting an abnormality of the switch (arm) that constitutes the H bridge circuit are limited.

  In addition, when power generation and drive are continued in the rotating electric machine, if the excited state and the regenerative state are alternately performed, the magnitude of the field easily fluctuates, and torque ripple occurs in the rotating electric machine. Therefore, it is not desirable to put the field winding in a regenerative state when power generation and driving are continued in the rotating electric machine.

  The present invention provides a controller of a rotary electric machine capable of increasing the chances of detecting an abnormality in each arm that constitutes an H bridge circuit that supplies electric power to a field winding. Is the main purpose.

  A first configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ), The connection point (P3) of the upper arm (SW1) and the lower arm (SW2, D2) of the first leg, and the connection point (P4) of the upper arm (SW3, D3) and the lower arm (SW4) of the second leg. And the upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the The upper arms of the two legs are each configured to have a semiconductor switching element or a diode, and the upper arms of the H-bridge circuit are connected to a high voltage terminal of a DC power source (21) and also connected to the H-bridge circuit. The lower arm is the front Excitation that is connected to a low voltage terminal of a DC power supply, makes both the upper arm of the first leg and the lower arm of the second leg conductive and causes an exciting current to flow from the DC power supply to the field winding. State, the upper arm of the first leg is in a conductive state, the lower arm of the second leg is in a cut-off state, a first return state in which a return current flows in the field winding, and a second return state of the second leg. A control unit that controls switching between a lower arm in a conductive state and an upper arm in the first leg in a cutoff state, and a second reflux state in which a reflux current flows through the field winding; and an excitation state, In the first recirculation state and the second recirculation state, an abnormality occurs in one of the upper arm and the lower arm of the first leg and the second leg based on the current flowing in the semiconductor switching element. Whether or not And an abnormality determining unit that determines that the second leg is in the open state when the abnormality determining unit determines that the upper arm of the second leg has an open abnormality. At least one of a control for prohibiting and a control for prohibiting switching to the second recirculation state when the abnormality determining unit determines that the lower arm of the first leg has an opening abnormality To do.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, a current flows through all the arms, and it is possible to determine an abnormality in each arm. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  Then, when the opening abnormality is occurring in the lower arm of the first leg, the control for prohibiting the second recirculation state is performed, and when the opening abnormality is occurring in the upper arm of the second leg, the second circulation state is prohibited. By performing at least one of the control to perform, the operation of the rotating electric machine can be continued even when an open abnormality occurs in the lower arm of the first leg or the upper arm of the second leg.

  In addition, as a result of a solder crack or the like occurring in each arm, the resistance value of the route in which the semiconductor switching element is provided increases or the voltage input to the control terminal of the semiconductor switching element decreases. An open abnormality occurs in which the current flowing through the device decreases. In the above configuration that determines the occurrence of the open abnormality based on the current flowing through the semiconductor switching element, it becomes possible to determine whether or not the open abnormality that the current flowing through each arm decreases occurs, and the open abnormality occurs. If so, the operation of the rotating electric machine can be continued.

  A second configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ), The connection point (P3) of the upper arm (SW1) and the lower arm (SW2, D2) of the first leg, and the connection point (P4) of the upper arm (SW3, D3) and the lower arm (SW4) of the second leg. And the upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the The upper arms of the two legs are each configured to have a semiconductor switching element or a diode, and the upper arms of the H-bridge circuit are connected to a high voltage terminal of a DC power source (21) and also connected to the H-bridge circuit. The lower arm is the front Excitation that is connected to a low voltage terminal of a DC power supply, makes both the upper arm of the first leg and the lower arm of the second leg conductive and causes an exciting current to flow from the DC power supply to the field winding. State, the upper arm of the first leg is in a conductive state, the lower arm of the second leg is in a cut-off state, a first return state in which a return current flows in the field winding, and a second return state of the second leg. A control unit that controls switching between a lower arm in a conductive state and an upper arm in the first leg in a cutoff state, and a second reflux state in which a reflux current flows through the field winding; and an excitation state, Either of the upper arm of the first leg and the lower arm of the second leg based on the voltage between the input and output terminals of the semiconductor switching element in the first return state and the second return state. Something is wrong with An abnormality determination unit that determines whether or not the control unit is in the first recirculation state when the abnormality determination unit determines that an open abnormality has occurred in the upper arm of the second leg. And a control for prohibiting switching to the second recirculation state when it is determined by the abnormality determining unit that the lower arm of the first leg has an opening abnormality. Do one.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, the voltage applied to all the arms is changed with respect to all the arms, and it is possible to determine the abnormality of each arm. it can. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  Then, when the opening abnormality is occurring in the lower arm of the first leg, the control for prohibiting the second recirculation state is performed, and when the opening abnormality is occurring in the upper arm of the second leg, the second circulation state is prohibited. By performing at least one of the control to perform, the operation of the rotating electric machine can be continued even when an open abnormality occurs in the lower arm of the first leg or the upper arm of the second leg.

  The current flowing through the H-bridge circuit changes according to the time constant of the H-bridge circuit, that is, the inductive component of the H-bridge circuit including the field winding and the resistance component of the H-bridge circuit. That is, the current flowing through the H-bridge circuit changes according to the time constant of the H-bridge circuit after the open / closed state of each semiconductor switching element changes. Particularly, when the semiconductor switching element is changed from the open state to the closed state under normal conditions, the current flowing through the semiconductor switching element increases from 0 according to the time constant. Therefore, in a normal state, when the semiconductor switching element is changed from the open state to the closed state, it takes a time corresponding to the time constant until the current flowing through the semiconductor switching element exceeds the predetermined current used for determining the open abnormality. Therefore, in the configuration in which the open abnormality is determined based on the current flowing in the H bridge circuit, when the switches SW1 to SW4 are changed from the open state to the closed state, the H bridge circuit is used to determine whether the open abnormality occurs. It takes time according to the time constant of 23.

  On the other hand, in a normal state, when the semiconductor switching element is changed from the open state to the closed state, the voltage between the input and output terminals of the semiconductor switching element changes immediately. Therefore, in the configuration in which the open / close abnormality is determined based on the voltage between the input / output terminals of the semiconductor switching element, the open abnormality is compared with the configuration in which the open abnormality is determined based on the current flowing between the input / output terminals of the semiconductor switching element. It can be determined with good responsiveness.

  Furthermore, since voltage detection can simplify the configuration more than current detection, in the configuration that determines the switching abnormality based on the voltage between the input and output terminals of the semiconductor switching element, it is based on the current flowing between the input and output terminals of the semiconductor switching element. The configuration can be simplified as compared with the configuration in which the open abnormality is determined.

  According to a third configuration, in the second configuration, the abnormality determination unit, in the excitation state, the first recirculation state, and the second recirculation state, a signal for instructing an open / close state of the semiconductor switching element, and Based on the voltage between the input and output terminals of the semiconductor switching element, it is determined whether or not an abnormality has occurred in either the upper arm or the lower arm of the first leg and the second leg.

  In this configuration, the occurrence of an abnormality is determined based on the voltage between the input and output terminals of the semiconductor switching element and a signal that commands the open / closed state of the semiconductor switching element. The signal instructing the open / closed state of the semiconductor switching element is a digital value and is less susceptible to noise as compared with the analog value. Therefore, it is possible to suppress the influence of noise in the abnormality determination. Further, based on the signal instructing the open / closed state of the semiconductor switching element, by determining the occurrence of the abnormality, it is possible to determine the occurrence of the abnormality at the timing when the open / closed state of the semiconductor switching element is changed, The occurrence of abnormality can be accurately determined.

  A fourth configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ), The connection point (P3) of the upper arm (SW1) and the lower arm (SW2, D2) of the first leg, and the connection point (P4) of the upper arm (SW3, D3) and the lower arm (SW4) of the second leg. And the upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the The upper arms of the two legs are each configured to have a semiconductor switching element or a diode, and the upper arms of the H-bridge circuit are connected to a high voltage terminal of a DC power source (21) and also connected to the H-bridge circuit. The lower arm is the front Excitation that is connected to a low voltage terminal of a DC power supply, makes both the upper arm of the first leg and the lower arm of the second leg conductive and causes an exciting current to flow from the DC power supply to the field winding. State, the upper arm of the first leg is in a conductive state, the lower arm of the second leg is in a cut-off state, a first return state in which a return current flows in the field winding, and a second return state of the second leg. A control unit that controls switching between a lower arm in a conductive state and an upper arm in the first leg in a cutoff state, and a second reflux state in which a reflux current flows through the field winding; and an excitation state, In the first recirculation state and the second recirculation state, an abnormality is detected in either the upper arm of the first leg or the lower arm of the second leg based on the temperature of the semiconductor switching element. Determine if it is occurring The abnormality determination unit, the control unit prohibits switching to the first recirculation state when the abnormality determination unit determines that there is an opening abnormality in the upper arm of the second leg. And a control for prohibiting switching to the second recirculation state when the abnormality determination unit determines that the lower arm of the first leg has an opening abnormality. .

  When the semiconductor switching element is closed, a current flows through the semiconductor switching element, so that the temperature of the semiconductor switching element rises. Further, when the semiconductor switching element is in the open state, no current flows in the semiconductor switching element, so the temperature of the semiconductor switching element does not rise. Therefore, based on the temperature of the semiconductor switching element, it is possible to determine whether or not an abnormality has occurred in either the upper arm of the first leg or the lower arm of the second leg.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, a current flows through all the arms, and it is possible to determine an abnormality in each arm. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  Then, when the opening abnormality is occurring in the lower arm of the first leg, the control for prohibiting the second recirculation state is performed, and when the opening abnormality is occurring in the upper arm of the second leg, the second circulation state is prohibited. By performing at least one of the control to perform, the operation of the rotating electric machine can be continued even when an open abnormality occurs in the lower arm of the first leg or the upper arm of the second leg.

  Further, as a result of a solder crack or the like occurring in the path where the semiconductor switching element is provided, the resistance value of the path where the semiconductor switching element is provided is increased, or the voltage input to the control terminal of the semiconductor switching element is increased. When it decreases, an open abnormality occurs in which the current flowing through the semiconductor switching element decreases. When the opening abnormality occurs in which the current flowing through the semiconductor switching element decreases, the temperature rise of the semiconductor switching element is suppressed when the current flows through the semiconductor switching element. Therefore, in the above-described configuration that determines the occurrence of the open abnormality based on the temperature of the semiconductor switching element, it becomes possible to determine whether or not the open abnormality in which the current flowing through the semiconductor switching element decreases is detected. When it occurs, the operation of the rotating electric machine can be continued.

  A fifth configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ) Is connected to the connection point (P3) of the upper arm (SW1) and the lower arm (SW2) of the first leg and the connection point (P4) of the upper arm (SW3) and the lower arm (SW4) of the second leg. , The upper arm of the H-bridge circuit is connected to the high voltage terminal of the DC power supply (21), and the lower arm of the H-bridge circuit is connected to the low voltage terminal of the DC power supply, The upper arm and the lower arm of the second leg are brought into conduction, and the lower arm of the first leg and the upper arm of the second leg are brought into a cutoff state, and An exciting state in which an exciting current is passed, and the upper arm of the first leg , And the upper arm of the second leg is made conductive, the lower arm of the first leg and the lower arm of the second leg are cut off, and a return current is applied to the field winding. The first recirculation state of flowing and the lower arm of the first leg and the lower arm of the second leg are brought into conduction, and the upper arm of the first leg and the upper arm of the second leg In a shut-off state, and a control unit for controlling switching between a second return state in which a return current flows through the field winding, and the excitation state, the first return state, and the second return state, An abnormality determination unit that determines whether or not an abnormality has occurred in any one of the upper arm and the lower arm of the first leg and the second leg based on the current flowing in the semiconductor switching element. , The control unit is When it is determined by the constant unit that the lower arm of the first leg has a closing abnormality, the upper arm of the second leg is brought into a conductive state, and the upper arm of the first leg and the The lower arm of the second leg is cut off to set the excitation current to the field winding, and the first recirculation state is prohibited. When it is determined that the upper arm is closed abnormally, the lower arm of the first leg is brought into conduction, and the upper arm of the first leg and the lower arm of the second leg are shut off. Then, at least one of the control for prohibiting the second recirculation state is performed while the excitation current is made to flow in the field winding.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, a current flows through all the arms, and it is possible to determine an abnormality in each arm. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  In the case where the lower arm of the first leg or the upper arm of the second leg has a closing abnormality, the excitation current is passed so that the DC power supply is not short-circuited, thereby causing the closing abnormality of the arm. Even then, the operation of the rotating electric machine can be continued.

  Further, when a closing abnormality occurs, the current flowing between the input and output terminals of each arm increases sharply. Therefore, in the configuration that determines the closing abnormality based on the current flowing in the semiconductor switching element, the input and output terminals of the semiconductor switching element are Compared with the configuration for determining the closing abnormality based on the voltage of, the closing abnormality can be determined with good responsiveness.

  A sixth configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ) Is connected to the connection point (P3) of the upper arm (SW1) and the lower arm (SW2) of the first leg and the connection point (P4) of the upper arm (SW3) and the lower arm (SW4) of the second leg. The upper arm and the lower arm of the first leg and the second leg are each configured to have a semiconductor switching element, and the upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power source (21). While being connected, the lower arm of the H-bridge circuit is connected to a low voltage terminal of the DC power supply to bring the upper arm of the first leg and the lower arm of the second leg into a conductive state, and The lower arm of the first leg, and The upper arm of the second leg is cut off, and an exciting current is passed through the field winding, and the upper arm of the first leg and the upper arm of the second leg are in a conductive state. The lower arm of the first leg and the lower arm of the second leg are in a cut-off state, and a first return state in which a return current flows through the field winding and the lower side of the first leg. The arm and the lower arm of the second leg are brought into conduction, the upper arm of the first leg and the upper arm of the second leg are brought into a cutoff state, and a return current flows through the field winding. A second recirculation state in which the current flows, and a control unit that controls switching between the excitation state, the first recirculation state, and the second recirculation state, based on the voltage between the input and output terminals of the semiconductor switching element, In front of the first leg and the second leg An abnormality determination unit that determines whether or not an abnormality has occurred in either the upper arm or the lower arm, and the control unit causes the abnormality determination unit to close the lower arm of the first leg. When it is determined that the upper arm of the second leg is in a conductive state, the upper arm of the first leg and the lower arm of the second leg are in a cutoff state, and When the excitation state is set such that an exciting current is supplied to the magnetic winding, the first return state is prohibited, and the abnormality determination unit determines that the upper arm of the second leg has a closing abnormality. Exciting for causing an exciting current to flow in the field winding, with the lower arm of the first leg being in a conductive state, the upper arm of the first leg and the lower arm of the second leg being in a blocking state And the second reflux state At least one of the control to prohibit the state is performed.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, the voltages applied to all the arms change, and it is possible to determine an abnormality in each arm. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  In the case where the lower arm of the first leg or the upper arm of the second leg has a closing abnormality, the excitation current is passed so that the DC power supply is not short-circuited, thereby causing the closing abnormality of the arm. Even then, the operation of the rotating electric machine can be continued.

  In addition, since voltage detection can simplify the configuration more than current detection, in the configuration that determines the switching abnormality based on the voltage between the input and output terminals of the semiconductor switching element, it is based on the current flowing between the input and output terminals of the semiconductor switching element. The configuration can be simplified as compared with the configuration in which the open abnormality is determined.

  In a seventh configuration according to the sixth configuration, the abnormality determination unit gives a signal for instructing an open / closed state of the semiconductor switching element in the excited state, the first return state, and the second return state, and Based on the voltage between the input and output terminals of the semiconductor switching element, it is determined whether or not an abnormality has occurred in either the upper arm or the lower arm of the first leg and the second leg.

  In this configuration, the occurrence of an abnormality is determined based on the voltage between the input and output terminals of the semiconductor switching element and a signal that commands the open / closed state of the semiconductor switching element. The signal instructing the open / closed state of the semiconductor switching element is a digital value and is less susceptible to noise as compared with the analog value. Therefore, it is possible to suppress the influence of noise in the abnormality determination. Further, based on the signal instructing the open / closed state of the semiconductor switching element, by determining the occurrence of the abnormality, it is possible to determine the occurrence of the abnormality at the timing when the open / closed state of the semiconductor switching element is changed, The occurrence of abnormality can be accurately determined.

  An eighth configuration is a controller (40) for a rotating electric machine (10) including an armature winding (14) and a field winding (12), the field winding including an H bridge circuit (23). ) Is connected to the connection point (P3) of the upper arm (SW1) and the lower arm (SW2) of the first leg and the connection point (P4) of the upper arm (SW3) and the lower arm (SW4) of the second leg. , The upper arm of the H-bridge circuit is connected to the high voltage terminal of the DC power supply (21), and the lower arm of the H-bridge circuit is connected to the low voltage terminal of the DC power supply, The upper arm and the lower arm of the second leg are brought into conduction, and the lower arm of the first leg and the upper arm of the second leg are brought into a cutoff state, and An exciting state in which an exciting current is passed, and the upper arm of the first leg , And the upper arm of the second leg is made conductive, the lower arm of the first leg and the lower arm of the second leg are cut off, and a return current is applied to the field winding. The first recirculation state of flowing and the lower arm of the first leg and the lower arm of the second leg are brought into conduction, and the upper arm of the first leg and the upper arm of the second leg In a shut-off state, and a control unit for controlling switching between a second return state in which a return current flows through the field winding, and the excitation state, the first return state, and the second return state, An abnormality determination unit that determines whether or not an abnormality has occurred in any one of the upper arm and the lower arm of the first leg and the second leg based on the temperature of the semiconductor switching element, The control unit is the abnormality determination unit. When it is determined that the lower arm of the first leg has a closing abnormality, the upper arm of the second leg is brought into a conductive state, and the upper arm of the first leg and the second leg are Of the upper arm of the second leg by a control for prohibiting the first recirculation state as well as an excitation state in which an excitation current is supplied to the field winding by disconnecting the lower arm of the second arm. When it is determined that a closing abnormality has occurred in the first leg, the lower arm of the first leg is brought into conduction, and the upper arm of the first leg and the lower arm of the second leg are brought into a blocked state. , And at least one of a control for prohibiting the second recirculation state as well as an excitation state in which an excitation current is supplied to the field winding.

  When the semiconductor switching element is closed, a current flows through the semiconductor switching element, so that the temperature of the semiconductor switching element rises. Further, when the semiconductor switching element is in the open state, no current flows in the semiconductor switching element, so the temperature of the semiconductor switching element does not rise. Therefore, based on the temperature of the semiconductor switching element, it is possible to determine whether or not an abnormality has occurred in either the upper arm of the first leg or the lower arm of the second leg.

  According to the above configuration, by switching between the first recirculation state and the second recirculation state, a current flows through all the arms, and it is possible to determine an abnormality in each arm. That is, it is possible to increase the chances of detecting an abnormality in each arm. In addition, by switching between the return flow on the upper arm side (first return state) and the return flow on the lower arm side (second return state), the heat generation in each arm when the return current flows is dispersed. Can be made.

  In the case where the lower arm of the first leg or the upper arm of the second leg has a closing abnormality, the excitation current is passed so that the DC power supply is not short-circuited, thereby causing the closing abnormality of the arm. Even then, the operation of the rotating electric machine can be continued.

  In a ninth configuration according to any one of the first to eighth configurations, further, the upper arm of the first leg and the lower arm of the second leg have a semiconductor switching element. When the abnormality determination unit determines that the upper arm of the first leg has an open abnormality, the control unit determines that the upper arm of the second leg and the lower side of the first leg. Control for prohibiting switching to the first recirculation state, while bringing the arm into a conductive state, setting the lower arm of the second leg in a shut-off state to bring an exciting current into the field winding, When it is determined by the abnormality determination unit that the lower arm of the second leg has an open abnormality, the upper arm of the second leg and the lower arm of the first leg are brought into a conductive state, and Blocks the upper arm of one leg In the state, while the excited state to flow an exciting current to the field winding, performed a control for prohibiting the switching to the second reflux of at least one of the.

  According to the above configuration, when an opening abnormality occurs in the upper arm of the first leg or the lower arm of the second leg, a magnetizing current is passed so as not to short-circuit the DC power supply, thereby causing a closing abnormality in the arm. Even if it occurs, the operation of the rotary electric machine can be continued.

  In a tenth configuration according to any one of the fifth to ninth configurations, the rotating electric machine is further mounted on a vehicle, and the field winding includes the upper arm of the first leg and the second winding. When a current flows through the lower arm of the leg, the field is larger than when a current flows through the upper arm of the second leg and the lower arm of the first leg. When the exciting current flows through the upper arm of the second leg and the lower arm of the first leg, the operation of an electric load mounted on the vehicle To limit.

  When the field winding has polarity, if a current is applied to the field winding in the opposite direction to the normal state when the arm is abnormal, the field becomes weaker than in the normal state. Therefore, the power generated by the rotating electric machine is reduced. Therefore, the configuration is such that the operation of the vehicle-mounted electric load is limited when the exciting current is reversed with respect to the field winding. With such a configuration, the vehicle can continue traveling even when the generated power is reduced.

  An eleventh configuration is the configuration according to any one of the first to tenth configurations, further in which the control unit determines that the abnormality determination unit determines that the upper arm of the first leg has a closing abnormality. In addition, the control for prohibiting switching to the second recirculation state and the first recirculation state when the abnormality determining unit determines that the lower arm of the second leg has a closing abnormality. At least one of the control that prohibits switching is performed.

  According to the above configuration, when a closing abnormality occurs in the upper arm of the first leg or the lower arm of the second leg, the excitation current is passed so that the DC power supply is not short-circuited, and thus the closing abnormality is generated in the arm. Even if it occurs, the operation of the rotary electric machine can be continued.

  In a twelfth configuration according to any one of the first to eleventh configurations, the upper arm and the lower arm of the first leg and the second leg each include a power semiconductor switching element.

  By configuring each arm by using a power semiconductor switching element (for example, power MOS-FET or IGBT), ripple of current flowing in the field winding is reduced, and the generated current and output torque of the rotating electric machine are stabilized. At the same time, the power efficiency of the H bridge circuit can be improved.

The figure showing the electric constitution of 1st Embodiment. The figure showing the electric constitution of the H bridge circuit of a 1st embodiment. The figure showing the course of the electric current which flows into an H bridge circuit at the time of normal. The timing chart showing adjustment of the field current by a control apparatus. A table showing the magnitude of current flowing through the switch in each of a normal state, an open abnormality, and a short abnormality. The figure showing operation | movement at the time of a short circuit abnormality of a 1st switch. The figure showing the operation | movement at the time of a short circuit abnormality of a 4th switch. The figure showing the operation | movement at the time of a short circuit abnormality of a 2nd switch. The figure showing operation | movement at the time of a short circuit abnormality of a 3rd switch. The figure showing the operation | movement at the time of the opening abnormality of a 1st switch. The figure showing the operation | movement at the time of the opening abnormality of a 4th switch. The figure showing the operation | movement at the time of the abnormal opening of a 2nd switch. The figure showing the operation | movement at the time of the opening abnormality of a 3rd switch. 3 is a flowchart showing a control process of the first embodiment. A table showing the magnitude of the switch voltage in each of a normal state, an open abnormality, and a short abnormality. A table showing the temperature of the switch in each of a normal state, an open abnormality, and a short abnormality. The figure showing the electric constitution of the H bridge circuit in a modification.

(First embodiment)
As shown in FIG. 1, the rotary electric machine 10 is a winding field type rotary electric machine having multi-phase windings, and more specifically, a winding field type synchronous rotary electric machine having three-phase windings. In this embodiment, an ISG (Integrated Starter Generator) in which the functions of a starter and an alternator (generator) are integrated is assumed as the rotary electric machine 10. Particularly, in the present embodiment, in addition to the initial start of the engine, the engine is automatically stopped when the predetermined automatic stop condition is satisfied, and then the engine is automatically restarted when the predetermined restart condition is satisfied. The rotating electric machine 10 also functions as a starter when executing the idling stop function.

  A rotor 11 (rotor) that constitutes the rotary electric machine 10 includes a field winding 12, and is capable of transmitting power to the crankshaft of the engine. In the present embodiment, the rotor 11 is connected (more specifically, directly connected) to the crankshaft via a belt. The armature winding 14 is wound around the stator 13 (stator) of the rotating electric machine 10 so as to be a three-phase winding.

  An inverter 20 is connected to the armature winding 14 of the rotating electric machine 10. A DC power supply 21 is connected to the inverter 20. The inverter 20 includes three sets of U, V, W-phase high potential side switches SUp, SVp, SWp and U, V, W-phase low potential side switches SUn, SVn, SWn connected in series. The connection points of the series connection bodies in the U, V, W phases are connected to the U, V, W phase terminals of the armature winding 14.

  In this embodiment, N-channel MOSFETs are used as the switches SUp to SWn. The free wheeling diodes DUp to DWn are connected in parallel to the switches SUp to SWn, respectively. The free wheeling diodes DUp to DWn may be body diodes of the switches SUp to SWn. Further, each of the switches SUp to SWn is not limited to the N-channel MOSFET and may be, for example, an IGBT.

  The positive terminal of the DC power supply 21 is connected to the high potential side terminal of the inverter 20 (the drain side terminal of each high potential side switch). The negative terminal of the DC power supply 21 is connected to the low potential side terminal (source side terminal of each low potential side switch).

  A DC voltage can be applied to the field winding 12 by the field current output unit 22. The field current output unit 22 adjusts the field voltage Vf applied to the field winding 12 by using the electric power supplied from the DC power supply 21 to change the field current If flowing in the field winding 12. Control. Thus, the armature winding 14 and the field winding 12 are supplied with power from the common DC power supply 21.

  The control device 40 acquires the detected value of the field current If from the field current detection unit 30. Then, the control device 40 feedback-controls the field current If to the command value If *. Further, the control device 40 uses the d-axis current command value Id *, which is a command value of the d-axis current Id, and the command value of the q-axis current Iq, based on the torque command value T * of the rotary electric machine 10 and the rotation angular velocity ω. A certain q-axis current command value Iq * is calculated. Here, the d-axis current Id and the q-axis current Iq are elements of a current vector formed of a set of the d-axis current and the q-axis current on the dq-axis coordinate system.

  The control device 40 generates the operation signals gUp to gWn based on the d-axis current command value Id * and the q-axis current command value Iq *. More specifically, based on the d-axis current command value Id *, the q-axis current command value Iq *, and the detected values of the phase currents IV and IW acquired from the phase current detection unit 31, the command voltage VU of each phase. Calculate *, VV *, VW *. Then, the operation signals gUp to gWn are generated by the PWM processing based on the magnitude comparison of the command voltages VU *, VV *, VW * and the carrier signal tp (for example, a triangular wave signal).

  Then, control device 40 outputs generated operation signals gUp to gWn to inverter 20. As a result, sinusoidal voltages whose phases are different from each other by 120 electrical degrees are applied to the U, V, and W phases of the armature winding 14, and sinusoidal currents whose phases are different from each other by 120 electrical degrees are applied. Will flow.

  FIG. 2 shows the electrical configuration of the field current output unit 22.

  The field current output unit 22 includes an H bridge circuit 23 and a drive circuit 24. The H-bridge circuit 23 has a first leg having a first switch SW1 and a second switch SW2 connected in series, and a second leg having a third switch SW3 and a fourth switch SW4 connected in series connected in parallel. Is configured. The first switch SW1 corresponds to the upper arm of the first leg, the second switch SW2 corresponds to the lower arm of the first leg, the third switch SW3 corresponds to the upper arm of the second leg, and the fourth switch SW4 It corresponds to the lower arm of the second leg. Each of the switches SW1 to SW4 is a power semiconductor switching element, specifically, a power MOS-FET. A body diode is connected in antiparallel to each of the switches SW1 to SW4. Hereinafter, each of the switches SW1 to SW4 will be collectively referred to as a switch SW. The switch SW may be an IGBT in which a free wheeling diode is connected in anti-parallel.

  The high-voltage terminal of the DC power supply 21 is connected to the input terminal P1 of the H-bridge circuit 23, the low-voltage terminal of the DC power supply 21 is connected to the input terminal P2, and the output terminals P3 and P4 of the H-bridge circuit 23 are connected to each other. The field winding 12 is connected. The H-bridge circuit 23 outputs the electric power supplied from the DC power supply 21 to the field winding 12. The drive circuit 24 drives the switches SW1 to SW4 in response to the command signal (ON operation signal and OFF operation signal) output from the control device 40 by the field current If.

  Further, in the field winding 12 of the present embodiment, when the field current If flows from the output terminal P3 to the output terminal P4, or when the field current If flows from the output terminal P4 to the output terminal P3. It has a polarity that makes the field larger than that of.

  The operation of the field current output unit 22 will be described with reference to FIGS. The control device 40 energizes the field winding 12 by turning on the first switch SW1 and the fourth switch SW4 (conduction state) and turning off the second switch SW2 and the third switch SW3 (cutoff state). The state (route A in FIG. 3) is set. As shown in FIG. 4, in the excited state, the DC current source 21 is connected to the field winding 12, so that the field current If (excitation current) flowing through the field winding 12 increases.

  When the field current If flowing in the field winding 12 reaches an upper limit value I1 (value obtained by adding a predetermined allowable value to If *) determined from the field current command value If *, the control device 40 causes the first switch SW1. By turning on the third switch SW3 and the third switch SW3 and turning off the second switch SW2 and the fourth switch SW4, the field winding 12 is brought into the first return state (path B in FIG. 3). In the first recirculation state, the connection between the field winding 12 and the DC power supply 21 is released, and the field current If (recirculation) flows from the field winding 12 toward the third switch SW3 and the first switch SW1. Current) flows. As shown in FIG. 4, in the first return state, the field current If (reflux current) is caused by the resistance component (copper loss) of the closed circuit including the field winding 12, the third switch SW3, and the first switch SW1. Will decrease.

  After that, when the current flowing through the field winding 12 reaches the lower limit value I2 (a value obtained by subtracting a predetermined allowable value from If *) determined from the field current command value If *, the control device 40 causes the first switch SW1 and By turning on the fourth switch SW4 and turning off the second switch SW2 and the third switch SW3, the field winding 12 is re-energized. As shown in FIG. 4, in the excited state, the DC current source 21 is connected to the field winding 12, so that the field current If (excitation current) flowing through the field winding 12 increases.

  When the field current If flowing in the field winding 12 reaches the upper limit value I1, the control device 40 turns on the second switch SW2 and the fourth switch SW4 and turns off the first switch SW1 and the third switch SW3. By doing so, the field winding 12 is brought into the second return state (path C in FIG. 3). In the second return state, the connection between the field winding 12 and the DC power supply 21 is released, and a return current flows from the field winding 12 toward the fourth switch SW4 and the second switch SW2. As shown in FIG. 4, in the second return state, the field current If (return current) is caused by the resistance component (copper loss) of the closed circuit including the field winding 12, the fourth switch SW4 and the second switch SW2. Will decrease.

  After that, when the field current If flowing through the field winding 12 reaches the lower limit value I2, the control device 40 turns on the first switch SW1 and the fourth switch SW4, and turns off the second switch SW2 and the third switch SW3. By setting the state, the H-bridge circuit 23 is excited again. As described above, the control device 40 alternately repeats the excited state and one of the first recirculation state and the second recirculation state to set the field current If to the upper limit value I1 determined by the field current command value If *. Adjust so as to be between the lower limit value I2. Furthermore, the heat generation in the switch SW can be dispersed by causing a current to flow through the different switch SW in the first recirculation state and the second recirculation state.

  The control device 40 of the present embodiment acquires the detected value of the current flowing through each of the switches SW1 to SW4 in the above-described excited state, the first recirculation state, and the second recirculation state, and based on the detected values, The abnormality of the switches SW1 to SW4 is determined.

  FIG. 5 shows the states of the operation signals of the respective switches and the magnitudes of the currents in the normal state, the short circuit abnormality (close abnormality), and the open abnormality (open abnormality).

  When the operation signal of the switch is in the OFF state, the current flowing through the switch is approximately 0 in the normal state, the overcurrent flows in the switch in the abnormal closing state, and the current flowing in the switch is approximately 0 in the abnormal opening state. . Therefore, when the operation signal of the switch is in the off state, the control device 40 can determine the closing abnormality of the switch. Here, when the other switch belonging to the same leg is turned on, an overcurrent flows to the switch at the time of abnormal closing. For example, when a closing abnormality occurs in the switch SW1 and the switch SW2 is turned on, an overcurrent flows in the switch SW1.

  When the operation signal of the switch is in the ON state, the current flowing through the switch is a predetermined current included in the range of the upper limit value I1 to the lower limit value I2 in the normal state, and the current flowing in the switch is the upper limit value I1 to the lower limit of the closing abnormality. The current becomes a predetermined current included in the range of the value I2, and when the opening is abnormal, the current flowing through the switch becomes substantially zero. Therefore, when the operation signal of the switch is in the ON state, the control device 40 can determine the open abnormality in the switch.

  Specifically, the control device 40 has a short circuit abnormality (close abnormality) in the second switch SW2 when a current larger than a predetermined current flows in the first switch SW1 and the second switch SW2 in the excited state. To determine. When a current larger than a predetermined current flows through the third switch SW3 and the fourth switch SW4 in the excited state, the control device 40 determines that the third switch SW3 has a short circuit abnormality.

  When a current larger than a predetermined current flows through the third switch SW3 and the fourth switch SW4 in the first recirculation state, the control device 40 determines that the fourth switch SW4 has a short circuit abnormality. When a current larger than a predetermined current flows through the first switch SW1 and the second switch SW2 in the second recirculation state, the control device 40 determines that the first switch SW1 has a short circuit abnormality.

  The control device 40 determines that an open abnormality (open abnormality) has occurred in the first switch SW1 when the currents flowing through the first switch SW1 are both substantially zero in the excited state and the first return state. The control device 40 determines that the open abnormality has occurred in the first switch SW1 when the currents flowing through the fourth switch SW4 are both substantially zero in the excited state and the second return state.

  In the control state, the current flowing through the first switch SW1 and the fourth switch SW4 is within the normal range in the excitation state, and the current flowing through the first switch SW1 and the third switch SW3 is in the first return state. When both are substantially 0, it is determined that the open abnormality has occurred in the third switch SW3. In the control state, the current flowing through the first switch SW1 and the fourth switch SW4 is within the normal range in the excited state, and the current flowing through the second switch SW2 and the fourth switch SW4 is in the second return state. When both are substantially 0, it is determined that the open abnormality has occurred in the fourth switch SW4.

  As described above, according to the configuration of the present embodiment, it is possible to determine the open abnormality and the short abnormality of the switches SW1 to SW4 while the power supply to the field winding 12 is continued.

  Further, the control device 40 of the present embodiment determines the path through which the exciting current flows and the path through which the return current flows based on the switch SW in which the abnormality has occurred and the type of abnormality (open abnormality or short abnormality) of the switch SW. Set at least one. Specific examples will be described with reference to FIGS. 6 to 13.

  As shown in FIG. 6, the control device 40 prohibits switching to the second recirculation state when a short circuit abnormality occurs in the first switch SW1. As a result, the second switch SW2 is turned on in the situation where the first switch SW1 has a short circuit abnormality, and the through current is suppressed from flowing through the first leg. That is, under the condition that the first switch SW1 has a short circuit abnormality, the fourth switch SW4 is turned on, and the second switch SW2 and the third switch SW3 are turned off, whereby the coil is excited. The third switch SW3 is turned on, and the second switch SW2 and the fourth switch SW4 are turned off to bring the coil into a return state (first return state).

  As shown in FIG. 7, the control device 40 prohibits switching to the first recirculation state when a short circuit abnormality occurs in the fourth switch SW4. As a result, it is possible to prevent the third switch SW3 from turning on and the flow of the through current to the second leg under the condition that the fourth switch SW4 has the short circuit abnormality. Under the condition that the fourth switch SW4 has a short circuit abnormality, the first switch SW1 is turned on, and the second switch SW2 and the third switch SW3 are turned off to turn the coil into an excited state. Also, the second switch SW2 is turned on, and the first switch SW1 and the third switch SW3 are turned off to bring the coil into the return state (second return state).

  As described above, when a short circuit abnormality occurs in one of the switches SW1 and SW4, one of the switches SW1 and SW4 is disabled by prohibiting one of the first recirculation state and the second recirculation state based on the abnormality determination result. Even if a short circuit abnormality has occurred in the, the operation of the rotary electric machine 10 can be continued.

  As shown in FIG. 8, when a short circuit abnormality occurs in the second switch SW2, the control device 40 reverses the direction of the exciting current passed through the field winding 12. Specifically, in the excited state, the third switch SW3 is turned on, and the first switch SW1 and the fourth switch SW4 are turned off, so that an exciting current is passed through the field winding 12. Further, by turning on the fourth switch SW4 and turning off the first switch SW1 and the third switch SW3, a return current is passed through the field winding 12.

  As shown in FIG. 9, the control device 40 reverses the direction of the exciting current flowing through the field winding 12 when a short circuit abnormality occurs in the third switch SW3. Specifically, by turning on the second switch SW2 and turning off the first switch SW1 and the fourth switch SW4, an exciting current is passed through the field winding 12. Further, the first switch SW1 is turned on, and the second switch SW2 and the fourth switch SW4 are turned off, so that a return current flows through the field winding 12.

  As described above, when a short circuit abnormality occurs in one of the switches SW2 and SW3, the direction of the exciting current flowing through the field winding 12 in the excited state is reversed based on the abnormality determination result, so that the switch SW2 Even if one of the SW3s has a short circuit abnormality, the operation of the rotary electric machine 10 can be continued.

  As shown in FIG. 10, the control device 40 reverses the direction of the exciting current flowing through the field winding 12 when an open abnormality occurs in the first switch SW1. Specifically, by turning on the second switch SW2 and the third switch SW3 and turning off the fourth switch SW4, an exciting current is passed through the field winding 12. Further, the second switch SW2 and the fourth switch SW4 are turned on and the third switch SW3 is turned off, so that a return current flows through the field winding 12.

  As shown in FIG. 11, the control device 40 reverses the direction of the exciting current flowing through the field winding 12 when the open abnormality occurs in the fourth switch SW4. Specifically, the second switch SW and the third switch SW3 are turned on, and the first switch SW1 is turned off, so that an exciting current is passed through the field winding 12. Further, the second switch SW2 is turned off, and the first switch SW1 and the third switch SW3 are turned on, so that a return current flows through the field winding 12.

  In this way, when one of the switches SW1 and SW4 has an open abnormality, the direction of the exciting current flowing through the field winding 12 in the excited state is reversed based on the abnormality determination result, and the first return state is obtained. And one of the second reflux state is prohibited. Thereby, even if one of the switches SW1 and SW4 has an open abnormality, the operation of the rotary electric machine 10 can be continued.

  As shown in FIG. 12, the control device 40 prohibits switching to the second recirculation state when an open abnormality has occurred in the second switch SW2. That is, an excited state in which an exciting current is passed through the field winding 12 via the first switch SW1 and the fourth switch SW4, and a return current is passed through the field winding 12 through the first switch SW1 and the third switch SW3. Control for alternately switching between the first return state and the first return state is performed.

  As shown in FIG. 13, the control device 40 prohibits the switching to the first recirculation state when the open abnormality occurs in the third switch SW3. That is, an excitation state in which an exciting current is passed through the field winding 12 via the first switch SW1 and the fourth switch SW4, and a return current is passed through the field winding 12 through the second switch SW2 and the fourth switch SW4. Control for alternately switching between the second reflux state and the second reflux state is performed.

  As described above, when one of the switches SW2 and SW3 has an open abnormality, one of the switches SW2 and SW3 is disabled by prohibiting one of the first return state and the second return state based on the abnormality determination result. Even if an open abnormality occurs in the electric machine, the operation of the rotary electric machine 10 can be continued.

  FIG. 14 shows a flowchart showing a control process of the field current output unit 22 by the control device 40. This processing is performed by the control device 40 at predetermined intervals.

  In step S01, it is determined whether the H bridge circuit 23 is in the excited state. When the H bridge circuit 23 is in the excited state (S01: YES), it is determined in step S02 whether the field current If is equal to or higher than the upper limit value I1. If the field current If is less than I1 (S02: NO), the processes in and after step S03 are performed.

  When the field current If is equal to or higher than the upper limit value I1 (S02: YES), it is determined in step S04 whether the first recirculation state is prohibited. When the first recirculation state is not prohibited (S04: NO), it is determined in step S05 whether the second recirculation state is prohibited. When the second recirculation state is prohibited (S05: YES), the H-bridge circuit 23 is set to the first recirculation state in step S06, and the processing of step S03 and subsequent steps is performed.

  When the second recirculation state is not prohibited (S05: NO), it is determined in step S07 whether or not the first recirculation state was set immediately before the current excitation state (previous recirculation state). If the first return state was set in the previous return state (S07: YES), the H bridge circuit 23 is set to the second return state in step S08, and the processes in step S03 and subsequent steps are performed. If the second return state was set in the previous return state (S07: NO), the H bridge circuit 23 is set to the first return state in step S06. When the first return state is prohibited (S04: YES), the H bridge circuit 23 is set to the second return state in step S08.

  When the H-bridge circuit 23 is in the return state (S01: NO), it is determined in step S09 whether the field current If is the lower limit value I2 or less. When the field current If is larger than I2 (S09: NO), the processing from step S03 is performed.

  When the field current If is equal to or lower than the lower limit value I2 (S09: YES), in step S10, at least one of the switches SW1 and SW4 has an open abnormality, or at least one of the switches SW2 and SW3 has a short abnormality. Or not. If a negative determination is made in step S10 (S10: NO), the H bridge circuit 23 is set in the excited state in step S11, and the processes in step S03 and subsequent steps are performed. When a positive determination is made in step S10 (S10: YES), in step S12, the H bridge circuit 23 is in the excited state so that the direction of the exciting current is reversed (flows from the terminal P4 to the terminal P3). Is set, and the processing from step S03 is performed.

  In step S03, it is determined whether or not there is an abnormality in each of the switches SW1 to SW4 based on the detected value of the current flowing in each of the switches SW1 to SW4. In step S13, it is determined whether at least one of the switches SW1 and SW3 has a short circuit abnormality, or whether at least one of the switches SW2 and SW4 has an open circuit abnormality. When a positive determination is made in step S13 (S13: YES), the second recirculation state is prohibited in step S14.

  In step S15, after the negative determination in step S13 (S13: NO), or in step S15, at least one of the switches SW2 and SW4 has a short circuit abnormality, or at least one of the switches SW1 and SW3 has an open abnormality. Or not. When a positive determination is made in step S15 (S15: YES), the first recirculation state is prohibited in step S16.

  In step S17 after the negative determination (S15: NO) in step S15 or in step S17, at least one of the switches SW2 and SW3 has a short circuit abnormality, or at least one of the switches SW1 and SW4 has an open abnormality. Or not. When an affirmative determination is made in step S17 (S17: YES), in step S18, the operation of various electric loads that are installed in the vehicle having the rotating electric machine 10 and are supplied with power from the rotating electric machine 10 and the DC power supply 21. And limit the processing. Further, if a negative determination is made in step S17 (S17: NO), the process ends.

  In the present embodiment, since the field winding 12 has polarity, if a current is applied to the field winding 12 in the opposite direction (P4 → P3) to the normal time (P3 → P4), the field winding 12 will be compared to the normal time. Magnetism weakens. Therefore, the electric power generated by the rotary electric machine 10 is reduced. Therefore, the control device 40 is configured to limit the operation of the vehicle-mounted electric load when the exciting current is reversed and applied to the field winding 12. For example, the electric load related to vehicle traveling is preferentially operated, and the operation of the electric load not related to vehicle traveling is limited. With such a configuration, the vehicle can continue traveling even when the generated power is reduced.

  The processes of steps S03, S10, S13, S15, and S17 correspond to the "abnormality determination unit", and the processes of steps S01 to S12, S14, S16, and S18 correspond to the "control unit".

(Second embodiment)
In the configuration of the first embodiment, the open abnormality and the close abnormality of each of the switches SW1 to SW4 are determined based on the currents flowing through the switches SW1 to SW4. In the present embodiment, the configuration is changed, and the open abnormality and the close abnormality of each of the switches SW1 to SW4 are determined based on the voltage between the input / output terminals (drain-source) of each of the switches SW1 to SW4. . The control by the control device 40 excluding the abnormality determination of the switches SW1 to SW4 by the control device 40 as the “abnormality determination unit” of the second embodiment, and the electrical configuration of the rotating electric machine 10 are the same as those of the first embodiment. Therefore, the description thereof will be omitted.

  In this embodiment, a voltage sensor is provided between the input and output terminals of each switch SW1 to SW4. Then, the control device 40 acquires the detection value of the voltage between the input / output terminals of the switches SW1 to SW4 by acquiring the detection value of the voltage sensor provided in each of the switches SW1 to SW4, and determines the switching abnormality. I do. Further, the control device 40 determines the open / close abnormality of each of the switches SW1 to SW4 based on the signal instructing the open / close state of each of the switches SW1 to SW4. Here, the signal instructing the open / closed state of each of the switches SW1 to SW4 is, for example, an operation signal input from the control device 40 to the drive circuit 24. The signal instructing the open / closed state of each of the switches SW1 to SW4 may be a drive signal output from the drive circuit 24 to each of the switches SW1 to SW4, or may be a gate voltage of each of the switches SW1 to SW4. Good.

  FIG. 15 shows the state of the operation signal of each switch and the magnitude of the voltage between the input and output terminals of the switch in the normal state, the short circuit abnormality (close abnormality), and the open abnormality (open abnormality).

  When the operation signal of the switch is off, the voltage between the input and output terminals of the switch is normally at a predetermined value (specifically, from the output voltage of the DC power supply 21) Voltage or a value obtained by subtracting the voltage drop in each of the switches SW1 to SW4), the voltage between the input and output terminals of the switch is approximately 0 when the short circuit is abnormal, and the voltage between the input and output terminals of the switch is abnormal when the open circuit is abnormal. The predetermined value is the same as in the normal state. Therefore, when the operation signal of the switch is in the off state, the control device 40 can determine the short circuit abnormality in the switch.

  When the operation signal of the switch is in the ON state, the voltage between the input and output terminals of the switch is approximately 0 in the normal state, and the voltage between the input and output terminals of the switch is approximately 0 in the abnormal short circuit. The voltage between the terminals becomes a predetermined value (specifically, a value obtained by subtracting the back electromotive voltage of the field winding 12 on the path and the voltage drop in each of the switches SW1 to SW4 from the output voltage of the DC power supply 21). . Therefore, when the operation signals of the switches SW1 to SW4 command the ON operation, the control device 40 can determine the open abnormality in the switch.

  Specifically, when the switches SW1 to SW4 are turned on and the detected value of the voltage between the input and output terminals of each of the switches SW1 to SW4 is higher than a predetermined value, the control device 40 causes the open abnormality. Determine that it has occurred. Further, the control device 40 has an open abnormality when the detected value of the voltage between the input / output terminals of the switches SW1 to SW4 is lower than a predetermined value while the switches SW1 to SW4 are turned off. To determine. The control device 40 sets the predetermined value used for the open abnormality determination based on the output voltage of the DC power supply 21, and sets the predetermined value used for the short abnormality determination to substantially 0. It should be noted that each of the predetermined values may be set to a value at which each of the open abnormality and the short abnormality can be determined.

  The current flowing through each of the switches SW1 to SW4 changes according to the time constant of the H bridge circuit 23, that is, the inductive component of the H bridge circuit 23 including the field winding 12 and the resistance component including the H bridge circuit 23. That is, the current flowing through each of the switches SW1 to SW4 changes according to the time constant after the open / closed state of each of the switches SW1 to SW4 changes. Particularly, when the switches SW1 to SW4 are changed from the open state to the closed state in the normal state, the current flowing through the switches SW1 to SW4 increases from 0 according to the time constant. Therefore, in a normal state, when the switches SW1 to SW4 are changed from the open state to the closed state, it takes time according to the time constant until the current flowing through the switches SW1 to SW4 exceeds the predetermined current used for the determination of the open abnormality. . Therefore, in the configuration for determining the opening / closing abnormality based on the current flowing between the input / output terminals of the switches SW1 to SW4, whether the open abnormality occurs when the switches SW1 to SW4 are changed from the open state to the closed state. It takes a time corresponding to the time constant of the H-bridge circuit 23 to judge.

  On the other hand, in a normal state, when the switches SW1 to SW4 are changed from the open state to the closed state, the voltage between the input and output terminals of the switches SW1 to SW4 changes immediately. Therefore, in the configuration in which the open / close abnormality is determined based on the voltage between the input / output terminals of the switches SW1 to SW4, compared with the configuration in which the open abnormality is determined based on the current flowing between the input / output terminals of the switches SW1 to SW4, open Abnormality can be determined with good responsiveness.

  Further, since the voltage detection can be simpler in configuration than the current detection, the current flowing between the input / output terminals of the switches SW1 to SW4 is determined in the configuration in which the switching abnormality is determined based on the voltage between the input / output terminals of the switches SW1 to SW4. The configuration can be simplified as compared with the configuration in which the open abnormality is determined based on.

  On the other hand, when a short circuit abnormality occurs, the current flowing between the input / output terminals of the switches SW1 to SW4 sharply increases. Therefore, in the configuration for determining the short circuit abnormality based on the current flowing between the input / output terminals of the switches SW1 to SW4, Compared with the configuration in which a short circuit abnormality is determined based on the voltage between the input and output terminals of the switches SW1 to SW4, the short circuit abnormality can be determined with high responsiveness.

  Further, as a result of a solder crack or the like occurring in the paths in which the switches SW1 to SW4 are provided, the resistance value of the paths in which the switches SW1 to SW4 are provided increases or is input to the gates of the switches SW1 to SW4. When the voltage drops, an anomaly occurs in which the current flowing through the switches SW1 to SW4 decreases. With the configuration of the first embodiment, it is possible to determine whether or not the above-described abnormality in which the currents flowing through the switches SW1 to SW4 decrease has occurred. The abnormality in which the current flowing through the switches SW1 to SW4 decreases is included in the open abnormality.

  In addition to the voltage between the input and output terminals of the switches SW1 to SW4, the control device 40 also determines the occurrence of an abnormality based on a signal that commands the open / closed state of the switches SW1 to SW4. The signals for instructing the open / closed states of the switches SW1 to SW4 are digital values and are less susceptible to noise than analog values. Therefore, it is possible to suppress the influence of noise in the abnormality determination. Further, by determining the occurrence of an abnormality based on the signal instructing the open / close state of the switches SW1 to SW4, it is possible to determine the occurrence of the abnormality at the timing when the open / close state of the switches SW1 to SW4 is changed. Therefore, the occurrence of abnormality can be accurately determined.

(Third Embodiment)
The control device 40 of the first embodiment is configured to determine the open abnormality and the short abnormality of each of the switches SW1 to SW4 based on the current flowing in each of the switches SW1 to SW4. Here, each of the switches SW1 to SW4 generates a loss due to the flow of a current and generates heat. Therefore, the control device 40 of the present embodiment changes the configuration and determines the open abnormality and the short abnormality of each of the switches SW1 to SW4 based on the temperature of each of the switches SW1 to SW4. The control by the control device 40 excluding the abnormality determination of each of the switches SW1 to SW4 by the control device 40 as the “abnormality determination unit” of the third embodiment, and the electrical configuration of the rotating electric machine 10 are the same as those of the first embodiment. Therefore, the description thereof will be omitted.

  In the present embodiment, each switch SW1 to SW4 is provided with a temperature sensitive diode, and a constant current is passed through the temperature sensitive diode. Then, the control device 40 acquires the detected value of the temperature of each of the switches SW1 to SW4 by acquiring the forward voltage drop of the temperature-sensitive diode provided in each of the switches SW1 to SW4, and determines the switching abnormality. . Instead of the temperature sensitive diode, a temperature sensitive resistor, a thermistor, a thermocouple or the like may be used.

  FIG. 16 shows the state of the operation signal of each switch and the temperature change of the switch during normal operation, short circuit abnormality (close abnormality), and open abnormality (open abnormality).

  When the switch operation signal is in the OFF state, the temperature of the switch does not rise under normal conditions (the temperature does not change or the temperature drops due to cooling such as air cooling), and the temperature of the switch rises during a short circuit abnormality. , The temperature of the switch does not rise at the time of open abnormality. Therefore, when the operation signal of the switch is in the off state, the control device 40 can determine the short circuit abnormality based on the temperature of the switch.

  When the operation signal of the switch is in the ON state, the temperature of the switch rises in the normal state, the temperature of the switch rises in the abnormal short circuit, and the temperature of the switch does not rise in the abnormal open state. Therefore, when the operation signal of the switch is in the ON state, the control device 40 can determine the open abnormality based on the temperature of the switch.

  Specifically, when the ON operation signal is input to the switches SW1 to SW4 and the temperature of the switches SW1 to SW4 does not rise, the control device 40 determines that an open abnormality has occurred in the switches SW1 to SW4 whose temperature does not rise. judge. Further, when the temperature of the switches SW1 to SW4 is rising under the condition that the OFF operation signal is input to the switches SW1 to SW4, the control device 40 short-circuits the switches SW1 to SW4 whose temperature is rising. It is determined that an abnormality has occurred.

  Here, in the first return state, a current flows in the reverse direction to the switch SW3 (forward direction to the body diode of the switch SW3). Further, in the second return state, a current flows in the reverse direction to the switch SW2 (forward direction to the body diode of the switch SW2). For example, in the first return state, when the switch SW3 is normal, current flows through the switch SW3 that is turned on, and when an open abnormality occurs in the switch, current flows through the body diode of the switch SW3. Similarly, in the case of the switch SW2 in the second return state, if an open abnormality occurs, a current flows through the body diode of the switch SW2. Therefore, in the configuration of the first embodiment in which the switching abnormality is determined based on the currents flowing through the switches SW1 to SW4, the open abnormality of the switch SW3 in the first return state and the open state of the switch SW2 in the second return state. Abnormality cannot be determined.

  Here, when a current flows through the switches SW2 and SW3, for example, assuming that the ON resistance of the switches SW2 and SW3 is 0.2 mΩ and the current flowing through the switches SW2 and SW3 is 10 A, heat generation (loss) in the switches SW2 and SW3 is It becomes 0.02 W (P = I ^ 2 * R = 10 * 10 * 0.0002 = 0.02). On the other hand, when a current flows through the body diodes of the switches SW2 and SW3, for example, assuming that the forward voltage drop of the body diodes of the switches SW2 and SW3 is 0.7 V and the current flowing through the switches SW2 and SW3 is 10 A, the switches SW2 and SW3. The heat generation (loss) in the body diode of is 7 W (P = I · Vf = 10 · 0.7 = 7). That is, heat generation of the switches SW2 and SW3 when a current flows through the switches SW2 and SW3, and heat generation of the switches SW2 and SW3 when a current flows through the body diodes of the switches SW2 and SW3 (heat generation of the body diodes of the switches SW2 and SW3). Therefore, the control device 40 of the third embodiment can determine the open abnormality of the switches SW2 and SW3 based on the temperatures of the switches SW2 and SW3.

  Further, as a result of a solder crack or the like occurring in the paths in which the switches SW1 to SW4 are provided, the resistance value of the paths in which the switches SW1 to SW4 are provided increases or is input to the control terminals of the switches SW1 to SW4. When the voltage applied to the switches decreases, an open abnormality occurs in which the current flowing through the switches SW1 to SW4 decreases. When an open abnormality occurs in which the current flowing through the switches SW1 to SW4 decreases, the temperature rise of the switches SW1 to SW4 when the current flows through the switches SW1 to SW4 is suppressed. Therefore, in the configuration of the third embodiment that determines the occurrence of the open abnormality based on the temperatures of the switches SW1 to SW4, it is possible to determine the presence or absence of the open abnormality in which the current flowing through the switches SW1 to SW4 decreases. Therefore, when the open abnormality has occurred, the operation of the rotary electric machine 10 can be continued.

(Other embodiments)
In the configuration of the first embodiment, the H bridge circuit may be replaced by the H bridge circuit 23 shown in FIG. 2 and an H bridge circuit 23a as shown in FIG. That is, from the configuration shown in FIG. 2, the switch of the lower arm of the first leg (second switch SW2) is changed to the free wheel diode D2, and the switch of the upper arm of the second leg (third switch SW3) is switched to the free wheel diode D3. You may change to.

  In this configuration, the switches SW1 and SW4 are both turned on, whereby the field winding 12 can be brought into an excited state in which an exciting current flows. Further, by setting the switch SW1 to the on state and the switch SW4 to the off state, it is possible to set the first return state in which the return current flows through the field winding 12, and the switch SW1 is turned off and the switch SW4 is turned on. By doing so, it is possible to set the second return state in which the return current flows through the field winding 12.

  Also in this configuration, by switching between the first recirculation state and the second recirculation state, a current flows through all the arms, and it is possible to determine an abnormality in each arm. That is, it is possible to secure an opportunity to detect an abnormality in each arm. In addition, the return current on the upper arm side (SW1, D3) (first return state) and the return operation on the lower arm side (SW2, D4) (second return state) are switched to implement the return current. It is possible to disperse the heat generated in each arm when flowing.

  Further, the control device 40 prohibits switching to the second recirculation state when a short circuit abnormality occurs in the first switch SW1. In addition, the control device 40 prohibits switching to the first recirculation state when a short circuit abnormality occurs in the fourth switch SW4. As described above, by supplying the exciting current so that the DC power supply 21 is not short-circuited, the operation of the rotary electric machine 10 can be continued even when one of the switches SW1 and SW4 has a closing abnormality.

  Further, the control device 40 prohibits the switching to the second return state when the open abnormality occurs in the return diode D2. Further, the control device 40 prohibits switching to the first return state when the open abnormality occurs in the return diode D3. The operation of the rotary electric machine 10 can be continued by changing the control when the open abnormality occurs in one of the diodes D2 and D3.

  The field winding 12 may have no polarity. In this case, the processes of steps S17 and S18 in the process of the flowchart shown in FIG. 13 may be omitted.

  In the H bridge circuit, one of the lower arm of the first leg and the upper arm of the second leg may be configured with a switch and the other with a free wheeling diode.

  In the flowchart shown in FIG. 13, the processes of steps S10 to S12, the processes of steps S13 and S14, the processes of steps S15 and S16, and the processes of steps S17 and S18 may be omitted.

  The control device 40 controls the output voltage of the H-bridge circuit 23 (voltage between terminals P3 and P4) to a predetermined voltage when adjusting the field current If to the field current command value If *. It may be one.

  The control device 40 as the abnormality determination unit is configured to acquire the detected value of the current flowing through each of the switches SW1 to SW4 and determine the abnormality of each of the switches SW1 to SW4 based on the detected value. The configuration may be changed so that the abnormality of each of the switches SW1 to SW4 is determined based on the detected value of the field current If flowing in the field winding 12.

  The drive circuit 24 may have a part or all of the configurations of the “abnormality determination unit” and the “control unit”. In particular, in the configuration of the second embodiment, if the drive circuit 24 has the configuration as the “abnormality determination unit”, the detected value of the voltage between the input and output terminals of each of the switches SW1 to SW4 is input to the drive circuit 24. Only then, the drive circuit 24 can perform the abnormality determination. Further, the drive circuit 24 is provided in each of the switches SW1 to SW4, and the drive circuit 24 provided in each of the switches SW1 to SW4 and each of the switches SW1 to SW4 are modularized, whereby the configuration can be simplified.

  10 ... Rotating electric machine, 12 ... Field winding, 14 ... Armature winding, 21 ... DC power supply, 23 ... H bridge circuit, 40 ... Control device, P3, P4 ... Output terminals, SW1-SW4 ... Switches.

Claims (12)

A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2, D2) of the first leg of the H bridge circuit (23) and the upper arm (SW3, D3) of the second leg. And the connection point (P4) of the lower arm (SW4),
The upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the upper arm of the second leg are provided. Each arm is configured to have a semiconductor switching element or diode,
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are both in a conductive state, and an exciting state in which an exciting current is caused to flow from the DC power supply to the field winding; A first return state in which a return current is passed through the field winding, with the upper arm being in a conducting state, the lower arm in the second leg being in a disconnecting state, and the lower arm in the second leg being in a conducting state; A control unit that controls to switch between a second recirculation state in which a recirculation current is caused to flow in the field winding by disconnecting the upper arm of one leg;
Any one of the upper arm and the lower arm of the first leg and the second leg based on a current flowing through the semiconductor switching element in the excited state, the first return state, and the second return state. An abnormality determination unit that determines whether or not an abnormality has occurred in
When the abnormality determination unit determines that the upper arm of the second leg has an open abnormality, the control unit controls the switching to the first recirculation state and the abnormality determination unit. A control device for a rotating electric machine that performs at least one of a control for prohibiting switching to the second recirculation state when it is determined that an opening abnormality has occurred in the lower arm of the first leg. A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2, D2) of the first leg of the H bridge circuit (23) and the upper arm (SW3, D3) of the second leg. And the connection point (P4) of the lower arm (SW4),
The upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the upper arm of the second leg are provided. Each arm is configured to have a semiconductor switching element or diode,
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are both in a conductive state, and an exciting state in which an exciting current is caused to flow from the DC power supply to the field winding; A first return state in which a return current is passed through the field winding, with the upper arm being in a conducting state, the lower arm in the second leg being in a disconnecting state, and the lower arm in the second leg being in a conducting state; A control unit that controls to switch between a second recirculation state in which a recirculation current is caused to flow in the field winding by disconnecting the upper arm of one leg;
In the excited state, the first recirculation state, and the second recirculation state, the upper arm of the first leg and the second leg of the second leg are based on the voltage between the input and output terminals of the semiconductor switching element. An abnormality determination unit that determines whether or not an abnormality has occurred in any of the lower arms,
When the abnormality determination unit determines that the upper arm of the second leg has an open abnormality, the control unit controls the switching to the first recirculation state and the abnormality determination unit. A control device for a rotating electric machine that performs at least one of a control for prohibiting switching to the second recirculation state when it is determined that an opening abnormality has occurred in the lower arm of the first leg.   In the excitation state, the first recirculation state, and the second recirculation state, the abnormality determination unit provides a signal for instructing an open / closed state of the semiconductor switching element, and an input / output terminal voltage of the semiconductor switching element. The control device for the rotary electric machine according to claim 2, wherein it is determined whether or not an abnormality has occurred in any one of the upper arm and the lower arm of the first leg and the second leg based on the basis. A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2, D2) of the first leg of the H bridge circuit (23) and the upper arm (SW3, D3) of the second leg. And the connection point (P4) of the lower arm (SW4),
The upper arm of the first leg and the lower arm of the second leg are each configured to have a semiconductor switching element, and the lower arm of the first leg and the upper arm of the second leg are provided. Each arm is configured to have a semiconductor switching element or diode,
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are both in a conductive state, and an exciting state in which an exciting current is caused to flow from the DC power supply to the field winding; A first return state in which a return current is passed through the field winding, with the upper arm being in a conducting state, the lower arm in the second leg being in a disconnecting state, and the lower arm in the second leg being in a conducting state; A control unit that controls to switch between a second recirculation state in which a recirculation current is caused to flow in the field winding by disconnecting the upper arm of one leg;
Any one of the upper arm of the first leg and the lower arm of the second leg based on the temperature of the semiconductor switching element in the excited state, the first return state, and the second return state. An abnormality determination unit that determines whether or not an abnormality has occurred in the
When the abnormality determination unit determines that the upper arm of the second leg has an open abnormality, the control unit controls the switching to the first recirculation state and the abnormality determination unit. A control device for a rotating electric machine that performs at least one of a control for prohibiting switching to the second recirculation state when it is determined that an opening abnormality has occurred in the lower arm of the first leg. A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2) of the first leg of the H bridge circuit (23), and the upper arm (SW3) and the lower arm (SW3) of the second leg. Connected to the connection point (P4) of SW4),
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are brought into conduction, and the lower arm of the first leg and the upper arm of the second leg are brought into a cutoff state; An exciting state in which an exciting current is supplied to the field winding, the upper arm of the first leg, and the upper arm of the second leg are brought into a conductive state, and the lower arm of the first leg and the A first return state in which a return current flows through the field winding and the lower arm of the second leg is cut off, and the lower arm of the first leg and the lower arm of the second leg are in a conductive state. And a control unit for performing a control for switching between the upper arm of the first leg and the upper arm of the second leg, and a second recirculation state in which a recirculation current is supplied to the field winding. When,
Any one of the upper arm and the lower arm of the first leg and the second leg based on a current flowing through the semiconductor switching element in the excited state, the first return state, and the second return state. An abnormality determination unit that determines whether or not an abnormality has occurred in
The control unit is
When it is determined by the abnormality determination unit that the lower arm of the first leg has a closing abnormality, the upper arm of the second leg is brought into a conductive state, and the upper arm of the first leg, and A control for turning off the lower arm of the second leg to bring the field winding into an exciting state in which an exciting current is supplied, and for prohibiting the first return state;
When it is determined by the abnormality determining unit that the upper arm of the second leg has a closing abnormality, the lower arm of the first leg is brought into a conductive state, and the upper arm of the first leg, and A rotary electric machine that performs at least one of a control for prohibiting the second recirculation state while the lower arm of the second leg is in a cutoff state to be in an excitation state in which an excitation current flows through the field winding. Control device. A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2) of the first leg of the H bridge circuit (23), and the upper arm (SW3) and the lower arm (SW3) of the second leg. Connected to the connection point (P4) of SW4),
The upper arm and the lower arm of the first leg and the second leg are each configured to have a semiconductor switching element,
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are brought into conduction, and the lower arm of the first leg and the upper arm of the second leg are brought into a cutoff state; An exciting state in which an exciting current is supplied to the field winding, the upper arm of the first leg, and the upper arm of the second leg are brought into a conductive state, and the lower arm of the first leg and the A first return state in which a return current flows through the field winding and the lower arm of the second leg is cut off, and the lower arm of the first leg and the lower arm of the second leg are in a conductive state. And a control unit for performing a control for switching between the upper arm of the first leg and the upper arm of the second leg, and a second recirculation state in which a recirculation current is supplied to the field winding. When,
The upper arm and the lower arm of the first leg and the second leg in the excited state, the first return state, and the second return state based on the voltage between the input and output terminals of the semiconductor switching element. An abnormality determination unit that determines whether or not an abnormality has occurred in any of the
The control unit is
When it is determined by the abnormality determination unit that the lower arm of the first leg has a closing abnormality, the upper arm of the second leg is brought into a conductive state, and the upper arm of the first leg, and A control for turning off the lower arm of the second leg to bring the field winding into an exciting state in which an exciting current is supplied, and for prohibiting the first return state;
When it is determined by the abnormality determining unit that the upper arm of the second leg has a closing abnormality, the lower arm of the first leg is brought into a conductive state, and the upper arm of the first leg, and A rotary electric machine that performs at least one of a control for prohibiting the second recirculation state while the lower arm of the second leg is in a cutoff state to be in an excitation state in which an excitation current flows through the field winding. Control device.   In the excitation state, the first recirculation state, and the second recirculation state, the abnormality determination unit provides a signal for instructing an open / closed state of the semiconductor switching element, and an input / output terminal voltage of the semiconductor switching element. The control device for the rotating electric machine according to claim 6, wherein it is determined whether or not an abnormality has occurred in any one of the upper arm and the lower arm of the first leg and the second leg based on the control. A controller (40) for a rotating electric machine (10) comprising an armature winding (14) and a field winding (12),
The field winding includes a connection point (P3) between the upper arm (SW1) and the lower arm (SW2) of the first leg of the H bridge circuit (23), and the upper arm (SW3) and the lower arm (SW3) of the second leg. Connected to the connection point (P4) of SW4),
The upper arm and the lower arm of the first leg and the second leg are each configured to have a semiconductor switching element,
The upper arm of the H bridge circuit is connected to a high voltage terminal of a DC power supply (21), and the lower arm of the H bridge circuit is connected to a low voltage terminal of the DC power supply,
The upper arm of the first leg and the lower arm of the second leg are brought into conduction, and the lower arm of the first leg and the upper arm of the second leg are brought into a cutoff state; An exciting state in which an exciting current is supplied to the field winding, the upper arm of the first leg, and the upper arm of the second leg are brought into a conductive state, and the lower arm of the first leg and the A first return state in which a return current flows through the field winding and the lower arm of the second leg is cut off, and the lower arm of the first leg and the lower arm of the second leg are in a conductive state. And a control unit for performing a control for switching between the upper arm of the first leg and the upper arm of the second leg, and a second recirculation state in which a recirculation current is supplied to the field winding. When,
In the excited state, the first return state, and the second return state, one of the upper arm and the lower arm of the first leg and the second leg is based on the temperature of the semiconductor switching element. An abnormality determination unit that determines whether or not an abnormality has occurred,
The control unit is
When it is determined by the abnormality determination unit that the lower arm of the first leg has a closing abnormality, the upper arm of the second leg is brought into a conductive state, and the upper arm of the first leg, and A control for turning off the lower arm of the second leg to bring the field winding into an exciting state in which an exciting current is supplied, and for prohibiting the first return state;
When it is determined by the abnormality determining unit that the upper arm of the second leg has a closing abnormality, the lower arm of the first leg is brought into a conductive state, and the upper arm of the first leg, and A rotary electric machine that performs at least one of a control for prohibiting the second recirculation state while the lower arm of the second leg is in a cutoff state to be in an excitation state in which an excitation current flows through the field winding. Control device. The upper arm of the first leg and the lower arm of the second leg are configured to include a semiconductor switching element,
The control unit is
When it is determined by the abnormality determination unit that the upper arm of the first leg has an open abnormality, the upper arm of the second leg and the lower arm of the first leg are brought into a conductive state, A control for turning off the lower arm of the second leg to bring the field winding into an exciting state in which an exciting current is supplied, and for prohibiting switching to the first recirculation state;
When it is determined by the abnormality determination unit that the lower arm of the second leg has an open abnormality, the upper arm of the second leg and the lower arm of the first leg are brought into a conductive state, and At least one of a control for prohibiting switching to the second recirculation state as well as an excitation state in which an excitation current is supplied to the field winding by disconnecting the upper arm of one leg. The control device for a rotating electric machine according to any one of 1 to 8. The rotating electric machine is mounted on a vehicle,
When a current flows through the upper arm of the first leg and the lower arm of the second leg, the field winding includes the upper arm of the second leg and the first leg. Comparing to the case where a current flows through the lower arm of, the field has a large polarity,
The operation of an electric load mounted on the vehicle is limited when the exciting current flows through the upper arm of the second leg and the lower arm of the first leg. 2. A control device for a rotating electric machine according to item 1.   When the abnormality determination unit determines that the upper arm of the first leg has a closing abnormality, the control unit controls the switching to the second recirculation state, and the abnormality determination unit. According to any one of claims 1 to 10, which performs at least one of a control for prohibiting switching to the first recirculation state when it is determined that a closing abnormality has occurred in the lower arm of the second leg. 2. A control device for a rotating electric machine according to item 1.   The control device for a rotating electric machine according to claim 1, wherein the upper arm and the lower arm of the first leg and the second leg are each configured to include a power semiconductor switching element.

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