Control device for rotary electric machine

Abstract

To obtain a control device for a rotary electric machine capable of appropriately setting an on / off signal of a switching element and improving efficiency of synchronous rectification.SOLUTION: A control device 100 controls a rotary electric machine 1 having double three-phase armature winding L11 to L23. The control device 100 includes first and second inverters 4A and 4B having a switching element corresponding to respective armature winding, and a synchronous rectification enabling signal generation unit that generates a synchronous rectification enabling signal based on a conduction state of a diode in antiparallel to each of the switching elements. When performing synchronous rectification on AC power supplied from the rotary electrical machine 1, a control unit 5 generates an on / off signal for the respective switching elements based on respective synchronous rectification enabling signal and rotation speed ω. Off timing of the on / off signal is set based on a latest value of synchronous rectification enabling time, which is the latest synchronous rectification enabling time.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a control device for a rotating electric machine. [Background technology]

[0002] In a control device for a rotating electric machine that operates as a motor or a generator, synchronous rectification is one method for rectifying AC power output from the rotating electric machine into DC power. Synchronous rectification converts AC power to DC power by controlling the on / off of switching elements in synchronization with the waveform of the input AC power. For example, Patent Document 1 describes a method for detecting the conduction time of a diode in a certain cycle and generating a signal that determines the timing of synchronous rectification in the next cycle, corresponding to the detected diode conduction time. Specifically, Patent Document 1 describes a method for controlling a switching element in the next cycle using the diode conduction time of the switching element itself, a method for using an average value including the diode conduction times of other switching elements, and a method for using a minimum value including the diode conduction times of other switching elements. Furthermore, when implementing synchronous rectification, when determining the on-timing and off-timing of the switching elements, it is necessary to appropriately set a margin time that takes into account the control delay time and the rotational fluctuations of the rotating electric machine, to prevent losses and unstable operation, and to ensure that the time for which synchronous rectification is performed is as long as possible, thereby preventing a decrease in the efficiency of synchronous rectification. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-284564 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technique described in Patent Document 1, it is difficult to appropriately set the margin time, which may result in reduced efficiency in synchronous rectification. More specifically, when using the diode conduction time of the switching element itself, the diode conduction time used as the basis for on / off control is information from one electrical angle cycle to half an electrical angle cycle ago. In such a case, particularly when the rotation speed of the rotating electric machine is increasing, it is necessary to ensure an extra margin time to prevent the margin time from becoming too small. Using an average value including the diode conduction times of other switching elements also results in the same problem as when using the diode conduction time of the switching element itself, because the average value is affected by past diode conduction times. Furthermore, using the minimum value including the diode conduction times of other switching elements reduces the risk of the margin time becoming too small, but conversely, there is a risk of setting an excessively long margin time. The present disclosure discloses a technology for solving the above-mentioned problems, and aims to provide a control device for a rotating electric machine that can appropriately set the on / off signals of switching elements and improve the efficiency of synchronous rectification. [Means for solving the problem]

[0005] A control device for a rotating electric machine according to the present disclosure controls a rotating electric machine having a plurality of sets of armature windings, each having an odd number of phases of three or more, and when AC power is supplied from the rotating electric machine, converts the AC power into DC power by synchronous rectification. The control device for a rotating electric machine includes a plurality of power conversion units each corresponding to each set of armature windings and connected between the corresponding armature winding and a DC power source, each having a series connection of a high-potential side switching element and a low-potential side switching element corresponding to each phase of the corresponding armature winding, and a plurality of diodes connected in anti-parallel to each switching element, and for at least one power conversion unit, detects the conduction state of each diode and converts each switching element into DC power by synchronous rectification. a synchronous rectification permission time calculation unit that calculates a synchronous rectification permission time, which is the length of an on-period of the synchronous rectification permission signal; and an on-off signal generation unit that generates on-off signals that switch on and off each switching element based on the synchronous rectification permission time, wherein when the number of sets is x and the number of phases is y, a phase difference between sets of armature windings of a plurality of sets is set equal to a value obtained by dividing π by the product of x and y, and the on-off signal generation unit obtains a latest synchronous rectification permission time value, which is the latest synchronous rectification permission time at the time of generation of the on-off signal, and determines the off timing of the on-off signal based on the latest synchronous rectification permission time value. [Effects of the Invention]

[0006] According to the control device for a rotating electric machine of the present disclosure, it is possible to appropriately set the on / off signals of the switching elements, thereby improving the efficiency of synchronous rectification. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic configuration diagram showing a control device for a rotating electric machine according to a first embodiment. [Figure 2] FIG. 3 is a diagram showing voltage vectors according to the first embodiment. [Figure 3] 1 is a schematic configuration diagram showing a converter according to a first embodiment. [Figure 4] 1 is a schematic configuration diagram showing a first inverter according to a first embodiment. [Figure 5] 4 is a diagram showing an example of a current path when all switching elements of the first inverter according to the first embodiment are turned off. FIG. [Figure 6] FIG. 2 is a schematic configuration diagram showing a second inverter according to the first embodiment. [Figure 7] FIG. 2 is a schematic block diagram showing a control unit according to the first embodiment. [Figure 8] 5 is a diagram illustrating a method for generating a field switching signal according to the first embodiment. FIG. [Figure 9] 3 is a block diagram showing an on / off signal generating unit according to the first embodiment. FIG. [Figure 10] 3A and 3B are diagrams illustrating a method for generating an on / off signal according to the first embodiment. [Figure 11] 5 is a diagram showing the relationship between the rotation speed and the on-margin time of the rotary electric machine according to the first embodiment. FIG. [Figure 12] 5 is a diagram showing the relationship between the rotation speed and the off-margin time of the rotary electric machine according to the first embodiment. FIG. [Figure 13] FIG. 4 is a diagram showing a synchronous rectification permission signal of each switching element according to the first embodiment, illustrating an example in which the synchronous rectification permission phase is 8 / 9π. [Figure 14] FIG. 4 is a diagram showing a synchronous rectification permission signal of each switching element according to the first embodiment, illustrating an example in which the synchronous rectification permission phase is π. [Figure 15] FIG. 4 is a diagram showing voltage vectors in a comparative example according to the first embodiment. [Figure 16] 1 is a schematic configuration diagram showing an example in which the rotating electric machine according to the first embodiment is used as a vehicle generator motor. [Figure 17] 3 is a diagram illustrating an example of a hardware configuration of a control unit according to the first embodiment. FIG. [Figure 18] FIG. 10 is a schematic configuration diagram showing a control device for a rotating electric machine according to a second embodiment. [Figure 19] FIG. 10 is a schematic block diagram showing a control unit according to a second embodiment. [Figure 20] 10 is a diagram illustrating a method for generating an on / off signal according to the second embodiment. FIG. [Figure 21] FIG. 10 is a diagram showing a synchronous rectification permission signal of each switching element according to the second embodiment, illustrating an example in which the synchronous rectification permission phase is 8 / 9π. [Figure 22] FIG. 10 is a diagram showing a synchronous rectification permission signal of each switching element according to the second embodiment, illustrating an example in which the synchronous rectification permission phase is π. DETAILED DESCRIPTION OF THE INVENTION

[0008] Embodiment 1 A first embodiment will be described below with reference to FIGS. 1 to 17. In each drawing, the same or corresponding members and parts are denoted by the same reference numerals. FIG. 1 is a schematic diagram showing a control device for a rotating electric machine according to the first embodiment. A control device 100, i.e., a control device for a rotating electric machine, controls a rotating electric machine 1 having multiple sets of multiple-phase armature windings. The control device 100 includes a converter 3, a first inverter 4A, and a second inverter 4B connected in parallel between a DC power supply 2 and the rotating electric machine 1, and a control unit 5 that controls the converter 3, the first inverter 4A, and the second inverter 4B. As will be described in detail later, the control unit 5 receives a control command C from a higher-level control device (not shown) and acquires data related to a DC voltage Vdc from the DC power supply 2. The control unit 5 generates field switching signals Qlp, Qrp, Qln, and Qrn from the data and outputs the signals to the converter 3. The control unit 5 also receives synchronous rectification enable signals Swp11, Swp12, Swp13, Swn11, Swn12, and Swn13 from the synchronous rectification enable signal generation unit of the first inverter 4A, acquires data related to the rotation speed ω from the rotating electric machine 1, generates on / off signals Qp11, Qp12, Qp13, Qn11, Qn12, and Qn13 from these signals, and outputs these signals to the first inverter 4A. Similarly, the control unit 5 receives synchronous rectification enable signals Swp21, Swp22, Swp23, Swn21, Swn22, and Swn23 from the synchronous rectification enable signal generation unit of the second inverter 4B, generates on / off signals Qp21, Qp22, Qp23, Qn21, Qn22, and Qn23 from these signals and the data related to the rotation speed ω, and outputs these signals to the second inverter 4B.

[0009] The rotating electric machine 1 is a dual three-phase rotating electric machine having two sets of armature windings, namely, first three-phase armature windings L11, L12, and L13, each having one end connected to a neutral point, and second three-phase armature windings L21, L22, and L23, each having one end connected to a neutral point, and a field winding Lf. That is, the rotating electric machine 1 has a plurality of sets of armature windings, each set having an odd number of phases (three or more). In the first embodiment, the number of armature winding sets is two, and the number of phases of each set is three. The first three-phase armature windings L11-L13 and the second three-phase armature windings L21-L23 are housed in a stator (not shown) of the rotating electric machine 1 in a state of being electrically isolated from each other and not connected to each other. Hereinafter, the three-phase armature winding of the ith group and jth phase may be referred to as the three-phase armature winding Lij. The voltage vectors of the first three-phase armature windings L11-L1 and the second three-phase armature windings L21-L23 are set as shown in Fig. 2. In Fig. 2, the voltage vector of the three-phase armature winding Lij of the ith group and jth phase is indicated as L(i, j). For example, the voltage vector of the first three-phase armature winding L11 is L(1, 1), the voltage vector of the second three-phase armature winding L23 is L(2, 3), and so on. 2, the first three-phase armature windings L11-L13, which constitute the first set of three-phase armature windings, and the second three-phase armature windings L21-L23, which constitute the second set of three-phase armature windings, are out of phase with each other by an electrical angle of π / 6, and the phase of the second three-phase armature windings L21-L23 lags behind the phase of the first three-phase armature windings L11-L13 by π / 6. The phase difference between the armature windings will be described in detail later.

[0010] In the first embodiment, the rotating electric machine 1 is a field winding type rotating electric machine in which an induced voltage is controlled by a field current if (not shown) flowing through a field winding Lf. However, a permanent magnet type rotating electric machine may also be used as the rotating electric machine 1. In this case, the field winding Lf can be omitted, and a permanent magnet for the field can be provided in the rotor (not shown) of the rotating electric machine 1.

[0011] The DC power supply 2 outputs a preset DC voltage Vdc to the converter 3, the first inverter 4A, and the second inverter 4B. As described above, data on the DC voltage Vdc to be output to the converter 3 and the like (this data is also written as Vdc in FIG. 1 and the like) is acquired by the control unit 5. The DC power supply 2 is not particularly limited as long as it outputs a DC voltage, and may be a battery, a DC-DC converter, a diode rectifier, a PWM (Pulse Width Modulation) rectifier, or the like.

[0012] FIG. 3 is a schematic diagram showing a converter according to the first embodiment, illustrating only the configuration necessary for explaining the converter 3. The converter 3 is connected between the DC power supply 2 and the field winding Lf and converts the DC voltage Vdc supplied from the DC power supply 2. The converter 3 applies the converted DC voltage Vdc to the field winding Lf, causing a field current if to flow through the field winding Lf. The converter 3 includes high-side switching elements Slp and Srp connected to a high-side line connected to the high-side of the DC power supply 2, and low-side switching elements Sln and Srn connected to a low-side line connected to the low-side of the DC power supply 2. The high-side switching elements Slp and Srp and the low-side switching elements Sln and Srn are connected in series to form two switching legs, i.e., a series-connected body. The junction between the high-side switching element Slp and the low-side switching element Sln that constitute one switching leg is connected to one end of the field winding Lf, and the junction between the high-side switching element Srp and the low-side switching element Srn that constitute the other switching leg is connected to the other end of the field winding Lf. In addition, a diode is connected in anti-parallel to each of the switching elements of the converter 3.

[0013] The switching elements Slp, Sln, Srp, and Srn of the converter 3 are turned on and off by field switching signals Qlp, Qln, Qrp, and Qrn input from the control unit 5, and the converter 3 converts the DC voltage Vdc into a desired voltage based on the field switching signals Qlp, Qln, Qrp, and Qrn and applies the desired voltage to the field winding Lf. This causes a field current if of a desired magnitude and direction to flow through the field winding Lf, generating a desired induced voltage. As described above, the field winding Lf can be omitted when a permanent magnet type rotating electric machine is used as the rotating electric machine 1. When the field winding Lf is omitted, the converter 3 can also be omitted.

[0014] The switching elements Slp, Sln, Srp, and Srn can be semiconductor switching elements such as IGBTs (Insulated Gate Bipolar Transistors), bipolar transistors, and MOS (Metal Oxide Semiconductor) power transistors. If there is no need to change the direction of the field current if flowing through the field winding Lf, the switching element Srp may be kept off, or the switching element Srp may be omitted and configured as a diode only. The same applies to the switching element Sln; it may be kept off or configured as a diode only. However, because a semiconductor switching element has a lower resistance in the on state than a diode, a configuration combining a switching element and a diode, as shown in Figure 3, can suppress heat generation.

[0015] Each of the field switching signals Qlp, Qln, Qrp, and Qrn turns on the corresponding switching element if its value is 1, and turns off the corresponding switching element if its value is 0 (zero). The generation of the field switching signals Qlp, Qln, Qrp, and Qrn will be described later.

[0016] 4 is a schematic configuration diagram showing a first inverter according to embodiment 1, illustrating only the configuration necessary for explaining the first inverter 4A. The first inverter 4A is an inverter corresponding to the first three-phase armature windings L11, L12, and L13, which are a first set of armature windings, and includes a full-bridge circuit unit 41A, i.e., a power conversion unit, connected between the DC power supply 2 and the first three-phase armature windings L11, L12, and L13, and a synchronous rectification enable signal generation unit 42A that generates synchronous rectification enable signals Swp11, Swp12, Swp13, Swn11, Swn12, and Swn13 from forward voltages Vdf of diodes (described later) connected in anti-parallel to the switching elements of the full-bridge circuit unit 41A, and outputs the generated synchronous rectification enable signals to the control unit 5.

[0017] The full-bridge circuit unit 41A includes high-side switching elements Sp11, Sp12, and Sp13 connected to a high-side line connected to the high-side of the DC power supply 2, and low-side switching elements Sn11, Sn12, and Sn13 connected to a low-side line connected to the low-side of the DC power supply 2. The high-side switching elements Sp11, Sp12, and Sp13 and the low-side switching elements Sn11, Sn12, and Sn13 are connected in series to form three switching legs, i.e., a series-connected body. Diodes Dp11 to Dp13 and Dn11 to Dn13, which serve as parasitic diodes, are connected in antiparallel to the switching elements Sp11 to Sp13 and Sn11 to Sn13, respectively. The connection point between the high-side switching element Sp11 and the low-side switching element Sn11 is connected to the other end (the terminal opposite the neutral point) of the first three-phase armature winding L11. Similarly, the connection points between the high-potential side switching elements Sp12, Sp13 and the low-potential side switching elements Sn12, Sn13 are connected to the other ends of the first three-phase armature windings L12, L13, respectively.

[0018] As the switching elements Sp11 to Sp13 and Sn11 to Sn13, similar to the switching elements Slp, Sln, Srp, and Srn of the converter 3, semiconductor switching elements such as IGBTs, bipolar transistors, and MOS power transistors can be used.

[0019] The three switching legs are connected in parallel, and power conversion is performed between the DC power supply 2 and the first three-phase armature windings L11, L12, and L13 by controlling the on / off of each switching element constituting the three switching legs. More specifically, when the rotating electric machine 1 is operated as a motor, the DC voltage Vdc supplied from the DC power supply 2 is converted into a three-phase AC voltage and supplied to the first three-phase armature windings L11, L12, and L13. When the rotating electric machine 1 is operated as a generator, the AC power supplied from the first three-phase armature windings L11, L12, and L13 is converted into DC power by synchronous rectification. That is, when AC power is supplied from the rotating electric machine 1, the full-bridge circuit unit 41A, and therefore the first inverter 4A, converts the AC power into DC power by synchronous rectification. The three switching legs are series connections of high-potential side switching elements and low-potential side switching elements corresponding to the respective phases of the first three-phase armature windings L11, L12, L13.

[0020] The switching elements of the full-bridge circuit section 41A, i.e., the high-side switching elements Sp11-Sp13 and the low-side switching elements Sn11-Sn13, are turned on and off based on on-off signals Qp11-Qp13 and on-off signals Qn11-Qn13, respectively. When the on-off signals Qp11-Qp13 and on-off signals Qn11-Qn13 have a value of 1, they turn on the corresponding switching element, and when the value is 0 (zero), they turn off the corresponding switching element. The generation of the on-off signals Qp11-Qp13 and on-off signals Qn11-Qn13 will be described later.

[0021] The synchronous rectification enable signal generation unit 42A detects the conduction states of the diodes Dp11-Dp13 and Dn11-Dn13, and generates synchronous rectification enable signals Swp11-Swp13 and Swn11-Swn13 corresponding to the switching elements Sp11-Sp13 and Sn11-Sn13, respectively, based on the conduction states of the diodes Dp11-Dp13 and Dn11-Dn13. The synchronous rectification enable signal generation unit 42A detects the conduction states of the diodes Dp11-Dp13 and Dn11-Dn13 based on their respective forward voltages. In FIG. 4, the forward voltages of the diodes Dp11-Dp13 and Dn11-Dn13 are collectively referred to as forward voltage Vdf.

[0022] 5, when all of the switching elements Sp11-Sp13 and Sn11-Sn13 are in the off state and current flows as indicated by the arrows in the figure, current flows through the diodes Dp11, Dn12, and Dn13, which are parasitic diodes of the high-side switching element Sp11 and the low-side switching elements Sn12 and Sn13, and the conduction state of these diodes is detected. On the other hand, the conduction state of the other diodes Dn11, Dp12, and Dp13 is not detected. In this case, the synchronous rectification enable signal generator 42A can permit synchronous rectification for the switching elements Sp11, Sn12, and Sn13, and determines that the switching elements Sp11, Sn12, and Sn13 may be turned on, thereby turning on the corresponding synchronous rectification enable signals Swp11, Swn12, and Swn13. On the other hand, for the other switching elements Sn11, Sp12, and Sp13, synchronous rectification cannot be permitted, and the corresponding synchronous rectification enable signals Swn11, Swp12, and Swp13 are turned off. Although not shown, a known technique may be used as a voltage detection means for detecting the forward voltage Vdf.

[0023] 6 is a schematic diagram showing the second inverter according to the first embodiment, illustrating only the configuration necessary for explaining the second inverter 4B. The second inverter 4B is an inverter corresponding to the second three-phase armature windings L21, L22, and L23, which are the second set of armature windings, but is similar in detail to the first inverter 4A. Specifically, the second inverter 4B includes a full-bridge circuit unit 41B and a synchronous rectification enable signal generating unit 42B. The full-bridge circuit unit 41B configures three switching legs, each of which includes high-side switching elements Sp21, Sp22, and Sp23 and low-side switching elements Sn21, Sn22, and Sn23 connected in series. The switching elements Sp21-Sp23 and Sn21-Sn23 are turned on and off based on on-off signals Qp21-Qp23 and on-off signals Qn21-Qn23. Diodes Dp21-Dp23 and Dn21-Dn23 are connected in anti-parallel to the switching elements Sp21-Sp23 and Sn21-Sn23, respectively, as parasitic diodes. A synchronous rectification enable signal generator 42B generates synchronous rectification enable signals Swp21-Swp23 and Swn21-Swn23 based on the conduction states of the diodes Dp21-Dp23 and Dn21-Dn23. The conduction states of each diode are detected based on its forward voltage Vdf.

[0024] 7 is a schematic block diagram showing a control unit according to embodiment 1. As described above, the control unit 5 controls the on / off of each switching element of the converter 3, the first inverter 4A, and the second inverter 4B, and includes a field voltage command calculation unit 51, a field switching signal generation unit 52, a synchronous rectification permission time calculation unit 53, and an on / off signal generation unit 54.

[0025] The field voltage command calculation unit 51 calculates a field voltage command Vf for controlling the field current if flowing through the field winding Lf based on the control command C and the DC voltage Vdc. In the control unit 5 of the first embodiment, it is assumed that the field voltage command Vf is calculated by feedforward control, but feedback control may also be used. When feedback control is used, a current detector (not shown) is provided in the converter 3 or between the converter 3 and the field winding Lf, and the current detected by this current detector is fed back to calculate the field voltage command Vf by a known method. The field voltage command Vf is, for example, a signal that takes a constant value between Vdc and −Vdc for each carrier cycle. The field voltage command calculation unit 51 outputs the calculated field voltage command Vf to the field switching signal generation unit 52.

[0026] The field switching signal generation unit 52 generates field switching signals Qlp, Qln, Qrp, and Qrn based on the field voltage command Vf and outputs them to the converter 3. FIG. 8 is a diagram illustrating a method for generating a field switching signal according to the first embodiment. In FIG. 8, the carrier signal Cf is a triangular wave with a period Tf (carrier period, tf1 to tf5), reaches a maximum value Vdc at times tf1 and tf5, and reaches a minimum value -Vdc at time tf3, which is midway between times tf1 and tf5. The field switching signal generation unit 52 compares the carrier signal Cf with the field voltage command Vf, and outputs "Qlp=1 and Qln=0" and "Qrp=0 and Qrn=1" when the field voltage command Vf is greater than the carrier signal Cf (tf2 to tf4). When the field voltage command Vf is smaller than the carrier signal Cf (tf1 to tf2, tf4 to tf5), "Qlp=0 and Qln=1" and "Qrp=1 and Qrn=0" are output. Note that to reduce the number of switching elements, "Qrp=0 and Qrn=1" may be always set.

[0027] As described above, when a permanent magnet type rotating electric machine is used as the rotating electric machine 1, the field winding Lf and the converter 3 can be omitted, and therefore the field voltage command calculation unit 51 and the field switching signal generation unit 52 can also be omitted.

[0028] The synchronous rectification permission time calculation unit 53 calculates synchronous rectification permission times Tp11-Tp13, Tn11-Tn13, Tp21-Tp23, and Tn21-Tn23 of each switching element of the first inverter 4A and the second inverter 4B based on the synchronous rectification permission signals Swp11-Swp13, Swn11-Swn13 and the synchronous rectification permission signals Swp21-Swp23, Swn21-Swn23 input from the synchronous rectification permission signal generation unit 42A and the synchronous rectification permission signal generation unit 42B, respectively. The synchronous rectification permission time calculation unit 53 calculates the difference between the time when each synchronous rectification permission signal changes from off to on and the time when it subsequently changes from on to off, thereby calculating the time during which the synchronous rectification permission signal is on as the synchronous rectification permission time. In other words, the "synchronous rectification permission time" is the length of the on-period of the synchronous rectification permission signal. The synchronous rectification permission time may be obtained by operating a timer or a counter from the time when the synchronous rectification permission signal is turned on. The synchronous rectification permission time calculation unit 53 outputs the synchronous rectification permission times Tp11 to Tp13, Tn11 to Tn13, Tp21 to Tp23, and Tn21 to Tn23 to the on / off signal generation unit 54.

[0029] The on / off signal generator 54 receives the synchronous rectification permission signals Swp11-Swp13, Swn11-Swn13, Swp21-Swp23, Swn21-Swn23, the synchronous rectification permission times Tp11-Tp13, Tn11-Tn13, Tp21-Tp23, Tn21-Tn23, and the rotation speed ω, and generates on / off signals Qp11-Qp13, Qn11-Qn13, Qp21-Qp23, Qp21-Qp23 for the respective switching elements based on these signals. Fig. 9 is a block diagram showing the on / off signal generator according to the first embodiment. The on / off signal generation unit 54 includes a latest value acquisition unit 541 that acquires a synchronous rectification permission time latest value Tnew, which is the latest synchronous rectification permission time, from among the synchronous rectification permission times Tp11 to Tp13, Tn11 to Tn13, Tp21 to Tp23, and Tn21 to Tn23; an on counter generation unit 542 that generates an on counter that determines the on timing of the on / off signal, based on the rotation speed ω; an off counter generation unit 543 that generates an off counter that determines the off timing of the on / off signal, based on the synchronous rectification permission time latest value Tnew and the rotation speed ω; and a signal generation unit 544 that generates each on / off signal by setting the on timing and off timing of each switching element based on each synchronous rectification permission signal, each on counter, and each off counter.

[0030] The "latest value" of the synchronous rectification allowable time latest value Tnew is the most recent at the time of generation of a specific on / off signal (e.g., Qp11), in other words, the synchronous rectification allowable time whose value was last determined at the time of generation of a specific on / off signal (e.g., Qp11), and is the synchronous rectification allowable time latest calculated by the synchronous rectification allowable time calculation unit 53. Since the "on counters" correspond to the respective on / off signals, there are on counters Con_p11 to Con_p13, Con_n11 to Con_n13, Con_p21 to Con_p23, and Con_n21 to Con_n23, as shown in the figure. The same is true for the "off counters," and there are off counters Coff_p11 to Coff_p13, Coff_n11 to Coff_n13, Coff_p21 to Coff_p23, and Coff_n21 to Coff_n23.

[0031] FIG. 10 is a diagram illustrating a method for generating an on / off signal according to the first embodiment. While FIG. 10 illustrates an example in which an on / off signal Qp21 is generated, the same applies to other on / off signals. First, at time tc0 (initial state), the synchronous rectification enable signal Swp21, the on counter Con_p21, the off counter Coff_p21, and the on / off signal Qp21 are all off or zero. When the synchronous rectification enable signal Swp21 switches from off to on at time tc1, the on / off signal generator 54 of the control unit 5 performs start trigger processing. Here, the "start trigger processing" refers to processing for starting generation of an on / off signal. That is, the on / off signal generator 54 generates the on / off signal Qp21 for the target switching element Sp21 (Sp21 in the example of FIG. 10) at timing (tc1) when the synchronous rectification enable signal (Swp21) corresponding to the target switching element for which the on / off signal is to be generated switches from off to on. At time tc1, the OFF timing of the synchronous rectification enable signal Swp21 has not been determined, and the synchronous rectification enable time Tp21 has not been determined either. Therefore, the ON / OFF signal generator 54 uses the latest value Tnew of the synchronous rectification enable time when setting the OFF timing of the ON / OFF signal Qp21.

[0032] In the start trigger process, the latest value acquisition unit 541 acquires the latest value Tnew of the synchronous rectification allowable time and outputs it to the off counter generation unit 543. The on counter generation unit 542 sets an on counter Con_p21. The on counter Con_p21 is set so that the on timing of the on-off signal Qp21 becomes a time (time tc2) delayed from time tc1 by an on margin time determined based on the rotation speed ω. The off counter generation unit 543 sets an off counter Coff_p21. The off counter Coff_p21 is set so that the off timing of the on-off signal Qp21 becomes a time (time tc3) obtained by subtracting the off margin time determined based on the rotation speed ω from the synchronous rectification end time (time tc4) based on Tnew. That is, when generating the on / off signal Qp21, the on / off signal generation unit 54 determines an on margin time based on the rotation speed ω, and sets the on timing of the on / off signal Qp21 to a time (time tc2) delayed by the on margin time from the timing (tc1) at which a synchronous rectification enable signal (Swp21) corresponding to the switching element (Sp21 in the example of FIG. 10) for which the on / off signal is to be generated switches from off to on. The on / off signal generation unit 54 also determines an off margin time based on the rotation speed ω, and determines the off timing of the on / off signal Qp21 based on the time (time tc3) obtained by subtracting the off margin time from the synchronous rectification end time (time tc4) based on the latest value Tnew of the synchronous rectification enable time.

[0033] The above-described "on margin time" and "off margin time" correspond to (t2-t1) and (t4-t3) in the example of FIG. 10. The relationship between the "on margin time" and "off margin time" and the rotation speed ω may be set to be a monotonically decreasing function of the rotation speed ω, as shown in FIGS. 11 and 12. In the relationships shown in FIGS. 11 and 12, the slope is steep in the low rotation speed region, and the "on margin time" and "off margin time" change more rapidly as the rotation speed ω decreases. However, the slope in the low rotation speed region may be gentler, and the "on margin time" and "off margin time" in the low rotation speed region may be shorter than in the example shown in FIGS. 11 and 12. By setting the on margin time and off margin time based on the rotation speed ω from the relationship between the on margin time and off margin time and the rotation speed as shown in FIGS. 11 and 12, the on margin time and off margin time can be optimized.

[0034] Although the off-margin time is calculated based on the rotation speed ω here, the off-margin time may be calculated by multiplying the latest synchronous rectification allowable time Tnew by a predetermined coefficient that is greater than zero and less than 1. In this case, the control unit 5 does not need to acquire the rotation speed ω to generate the on / off signal.

[0035] After time tc1, the signal generating unit 544 decrements (decreases) the on counter Con_p21 and the off counter Coff_p21 as time passes. The signal generating unit 544 switches the on / off signal Qp21 from off to on at the timing (time tc2) when the on counter Con_p21 reaches zero. The signal generating unit 544 also switches the on / off signal Qp21 from on to off at the timing (time tc3) when the off counter Coff_p21 reaches zero. Note that although the decrementing of the on counter Con_p21 and the off counter Coff_p21 is assumed to start from tc1 here, it is also possible to start decrementing the off counter Coff_p21 from time tc2 when the on counter Con_p21 reaches zero. As long as the desired on margin time and off margin time can be obtained, the timing to start decrementing the on counter Con_p21 and the off counter Coff_p21 is not particularly limited.

[0036] When the synchronous rectification permission signal Swp21 switches from ON to OFF at time tc5, the control unit 5 performs end trigger processing. Here, the "end trigger processing" refers to processing for calculating the synchronous rectification permission time that has been determined when the synchronous rectification permission signal Swp21 switches from ON to OFF, and updating the latest value Tnew of the synchronous rectification permission time. Here, the synchronous rectification permission time calculation unit 53 calculates the synchronous rectification permission time Tp21. As a result, the latest synchronous rectification permission time becomes the synchronous rectification permission time Tp21, and the latest value Tnew of the synchronous rectification permission time is updated to the synchronous rectification permission time Tp21. For this reason, a configuration may be adopted in which a storage unit (not shown) is further provided, and the latest value Tnew of the synchronous rectification permission time is stored in advance in the storage unit. In this case, when a synchronous rectification permission signal switches from on to off and a new synchronous rectification permission time is calculated by the synchronous rectification permission time calculation unit 53, the control unit 5 updates the latest synchronous rectification permission time Tnew stored in the storage unit with the latest calculated synchronous rectification permission time. When an on / off signal is generated, it is sufficient to read out the latest synchronous rectification permission time Tnew stored in the storage unit at that time.

[0037] In the first embodiment, as described with reference to FIG. 10 , the start trigger process is performed when the corresponding synchronous rectification enable signal switches from off to on, triggering the generation of the on / off signal. Conventionally, the on / off signal may be generated periodically. However, considering the relationship between the synchronous rectification enable signal and the on / off signal, generating the on / off signal when the synchronous rectification enable signal switches from off to on can reduce the delay associated with the generation of the on / off signal, rather than generating the on / off signal through periodic processing. In this case, the margin time (on margin time and off margin time) for the synchronous rectification enable signal can be reduced, enabling more efficient synchronous rectification. Furthermore, by performing the end trigger process when the synchronous rectification enable signal switches from on to off, the latest synchronous rectification enable time can be obtained earlier than in the case of periodic processing. In this case, the latest value of the synchronous rectification enable time can be more reliably the latest synchronous rectification enable time.

[0038] 10, for the sake of distinction, the synchronous rectification permission time Tp21 and the latest value Tnew of the synchronous rectification permission time are shown as different lengths. Therefore, the off-margin time (t4-t3) from the synchronous rectification end time based on the latest value Tnew of the synchronous rectification permission time is also shown as being different from the actual off-margin time (t5-t3). However, if the induced voltage due to the rotation of the rotating electric machine 1 is constant, the synchronous rectification permission time Tp21 and the latest value Tnew of the synchronous rectification permission time are equivalent, and a sufficient off-margin time can be ensured even at the time tc5 when the synchronous rectification permission signal Swp21 switches from on to off.

[0039] Furthermore, the on / off signal generating unit 54 of the first embodiment receives the synchronous rectification permission times Tp11 to Tp13, Tn11 to Tn13, Tp21 to Tp23, and Tn21 to Tn23 and the synchronous rectification permission signals Swp11 to Swp13, Swn11 to Swn13, Swp21 to Swp23, and Swn21 to Swn23 as input, but as shown in the example of Fig. 10, in order to generate the on / off signals (generate the on counters and off counters), it is only necessary to know the latest value Tnew of the synchronous rectification permission time and the timing at which the synchronous rectification permission signal switches from off to on. Therefore, the on / off signal generating unit 54 may be configured to acquire these values.

[0040] Next, the latest value of the synchronous rectification permission time will be further described. The latest value Tnew of the synchronous rectification permission time used when generating the on / off signal is the latest synchronous rectification permission time at the time of start trigger processing. Since the synchronous rectification permission signals Swp11 to Swp13, Swn11 to Swn13, Swp21 to Swp23, and Swn21 to Swn23 are periodically turned on and off in accordance with the operations of the first inverter 4A and the second inverter 4B, when a synchronous rectification permission signal switches from off to on, the question arises as to which is the latest synchronous rectification permission time at that time, that is, which is the synchronous rectification permission time that was determined most recently. The synchronous rectification permission time that was determined most recently is the synchronous rectification permission time of the synchronous rectification permission signal for which the most recent end trigger processing was performed (switched from on to off). FIG. 13 is a diagram showing the synchronous rectification permission signals of each switching element according to the first embodiment, illustrating an example in which the synchronous rectification permission phase is 8 / 9π. The "synchronous rectification permission phase" is a phase corresponding to the synchronous rectification permission time, and for example, when the synchronous rectification permission phase is π, the synchronous rectification permission time is half a cycle. "When the synchronous rectification permission phase is 8 / 9π" is an example of when the rotation speed ω of the rotating electric machine 1 and the induced voltage caused by the rotation of the rotating electric machine 1 are small, that is, when the induced voltage caused by the rotation of the rotating electric machine 1 is equal to or less than a predetermined value.

[0041] 13, the synchronous rectification enable signal Swp11 switches from off to on at time ts1, and switches from on to off at time ts12. As described above, the phase difference between the first three-phase armature winding L11 and the second three-phase armature winding L21 is π / 6, so the synchronous rectification enable signal Swp21 of the switching element Sp21 switches from off to on at time t3, which is delayed from time ts1 by the time corresponding to the phase of π / 6, and switches from on to off at time ts14, which is delayed from time ts12 by the time corresponding to the phase of π / 6.

[0042] At time ts13, the synchronous rectification enable signal Swn11 of the switching element Sn11 switches from off to on, start trigger processing of the switching element Sn11 is performed, and generation of the on / off signal Qn11 begins. At this time, the synchronous rectification enable signal that most recently switched from on to off is the synchronous rectification enable signal Swp11, so the synchronous rectification enable time latest value Tnew used to generate the on / off signal Qn11 of the switching element Sn11 is the synchronous rectification enable time Tp11 of the synchronous rectification enable signal Swp11. Therefore, the off counter Coff_n11 is determined based on the synchronous rectification enable time Tp11, which is the synchronous rectification enable time latest value Tnew.

[0043] 13, when the induced voltage due to the rotation of the rotating electric machine 1 is small and the synchronous rectification permission phase is short, the time from time ts12 when the latest synchronous rectification permission time Tnew is updated to the synchronous rectification permission time Tp11 to time ts13 when the start trigger process for the switching element Sn11 is performed is long, and it is possible to update the latest synchronous rectification permission time Tnew in the end trigger process for the switching element Sp11. In other words, when the induced voltage due to the rotation of the rotating electric machine 1 is equal to or smaller than a predetermined value, the turn-off timing of the low-potential side switching element Sn11 may be determined based on the synchronous rectification permission time Tp11 of the high-potential side switching element Sp11. The other switching elements are considered in a similar manner, where x is an integer greater than or equal to 2, y is an odd number greater than or equal to 3, i1 is a natural number less than or equal to x, and j is a natural number less than or equal to y, and the off-timing of the high-potential side switching element corresponding to the j-phase of group i1 and the off-timing of the low-potential side switching element corresponding to the j-phase of group i1 are determined based on the synchronous rectification allowed time of the low-potential side switching element corresponding to the j-phase of group i1 and the synchronous rectification allowed time of the high-potential side switching element corresponding to the j-phase of group i1, respectively.

[0044] In addition, since the induced voltage caused by the rotation of the rotating electric machine 1 varies depending on the magnetic flux of the rotor of the rotating electric machine 1, the field current if, and the rotation speed ω, other parameters that can be substituted for the induced voltage, such as the field current if or the rotation speed ω, may be used as the judgment condition instead of the induced voltage.

[0045] Fig. 14 is a diagram showing the synchronous rectification enable signals of each switching element according to embodiment 1, and is a diagram showing an example where the synchronous rectification enable phase is π. The example shown in Fig. 13 is an example where the induced voltage due to the rotation of the rotating electric machine 1 is small, but the example shown in Fig. 14 is an example where the induced voltage due to the rotation of the rotating electric machine 1 is large. In Fig. 14, the synchronous rectification enable signal Swp11 of the switching element Sp11 switches from off to on at time ts31, and switches from on to off at time ts37. Since the phase difference between the first three-phase armature winding L11 and the second three-phase armature winding L21 is π / 6, the synchronous rectification enable signal Swp21 of the switching element Sp21 switches from off to on at time ts32, which is delayed from time ts31 by a time corresponding to the phase of π / 6, and switches from on to off at time ts38, which is delayed from time ts37 by a time corresponding to the phase of π / 6.

[0046] At time ts38, the synchronous rectification enable signal Swn21 of the switching element Sn21 switches from off to on, start trigger processing of the switching element Sn21 is performed, and generation of the on / off signal Qn11 begins. At this time, the synchronous rectification enable signal that switched from on to off most recently is the synchronous rectification enable signal Swp21. However, the timing at which the synchronous rectification enable time Tp21 is determined and the timing at which the start trigger processing of the switching element Sn21 is performed are the same, and there is no time to update the latest value Tnew of the synchronous rectification enable time to the synchronous rectification enable time Tp21. Therefore, the latest value Tnew of the synchronous rectification enable time is the synchronous rectification enable time Tp11 determined at time ts37. As a result, the synchronous rectification enable time Tp11 is used in the start trigger processing of the switching element Sn21, and the off counter Coff_n21 is determined based on the synchronous rectification enable time Tp11, which is the latest value Tnew of the synchronous rectification enable time.

[0047] 14, when the induced voltage due to the rotation of the rotating electric machine 1 is large and the synchronous rectification permitted phase is large, the latest value Tnew of the synchronous rectification permitted time cannot be updated in time as described above, and the latest value Tnew of the synchronous rectification permitted time obtained by the immediately previous update (the update performed by the end trigger process between time ts37 and time ts38) is used. In other words, when the induced voltage due to the rotation of the rotating electric machine 1 is larger than a predetermined value, the turn-off timing of the low-potential side switching element Sn21 can be determined based on the synchronous rectification permitted time Tp11 of the high-potential side switching element Sp11. The same applies to other switching elements, where x is an integer equal to or greater than 2, y is an odd number equal to or greater than 3, i2 is a natural number equal to or greater than 2 and equal to x, and j is a natural number equal to or less than y, and the off-timing of the high-potential-side switching element corresponding to the j-phase of group i2 and the off-timing of the low-potential-side switching element corresponding to the j-phase of group i2 are determined based on the synchronous rectification enabled time of the low-potential-side switching element corresponding to the j-phase of group i2-1 and the synchronous rectification enabled time of the high-potential-side switching element corresponding to the j-phase of group i2-1, respectively. In this way, by using the synchronous rectification enabled time immediately preceding the switching element on the opposite side of the own phase (the low-potential side in the case of the high-potential side, and the high-potential side in the case of the low-potential side), it is possible to ensure sufficient processing time even when the induced voltage is large and the synchronous rectification enabled phase is wide.

[0048] Furthermore, for the switching elements corresponding to the armature windings of the first group, j* that satisfies the following equation (1) is used, and the off-timing of the high-potential side switching element corresponding to the j-th phase of the first group and the off-timing of the low-potential side switching element corresponding to the j-th phase of the first group are determined based on the synchronous rectification allowed time of the high-potential side switching element corresponding to the j*-th phase of the x-th group and the synchronous rectification allowed time of the low-potential side switching element corresponding to the j*-th phase of the x-th group, respectively.

number

[0049] Although the examples described above are those in which the synchronous rectification permission phase is 8 / 9π and those in which the synchronous rectification permission phase is π, the synchronous rectification permission phase may be in the range of 2 / 3π to π. The synchronous rectification permission phase changes depending on the field current if, and the smaller the change in the synchronous rectification permission phase due to the field current if, the more stable the synchronous rectification becomes. For this reason, it is more preferable to perform synchronous rectification with the synchronous rectification permission phase in the range of 5 / 6π to π.

[0050] Here, the effect of using multiple sets of odd-phase armature windings with phase differences, as in the first embodiment, will be described. As a comparative example, consider a rotating electric machine with a single set of six-phase armature windings. In the case of a single set of six-phase armature windings, the number of switching elements is the same as in the dual three-phase case, but the voltage vectors associated with each switching element are as shown in FIG. 15. The phase difference between L(1,1) and L(1,4), L(1,2) and L(1,5), and L(1,3) and L(1,6) is π. In this case, the synchronous rectification enable signal of the high-potential side switching element connected to the L(1,1) armature winding and the synchronous rectification enable signal of the low-potential side switching element connected to the L(1,4) armature winding have the same output, resulting in only six types of synchronous rectification enable signals being obtained, instead of the originally expected 12 types. Furthermore, because the latest value Tnew of the synchronous rectification allowable time is updated every time the phase changes by π / 3, the latest value Tnew of the synchronous rectification allowable time is updated only six times during one electrical angle cycle. On the other hand, when two sets of three-phase armature windings are used as in the first embodiment, no voltage vectors overlap as shown in FIG. 2 , and 12 types of synchronous rectification allowable signals can be obtained. In this case, the latest value Tnew of the synchronous rectification allowable time can be updated 12 times during one electrical angle cycle. By configuring the latest value Tnew of the synchronous rectification allowable time to be updated frequently in this way, the latest synchronous rectification allowable time can be obtained more quickly. In this case, the latest value Tnew of the synchronous rectification allowable time can be more reliably the latest synchronous rectification allowable time.

[0051] Furthermore, if there are multiple sets of armature windings, each set will need to be equipped with a corresponding inverter. For example, if there is a configuration with one 9-phase inverter, it will be necessary to implement a circuit consisting of 18 switching elements all together. On the other hand, if there are three 3-phase inverters, it will be possible to implement three independent inverter circuits consisting of 6 switching elements, which will increase the degree of freedom in layout. In this way, even if the number of switching elements is the same, using multiple sets of armature windings is advantageous in terms of the degree of freedom in circuit design.

[0052] Next, the optimal phase difference between the windings will be described. In the first embodiment, if the phase difference between the first three-phase armature winding L11 and the second three-phase armature winding L21 is assumed to be p, then the phase change from the phase at which the synchronous rectification enable signal Swp11 switches from on to off to the phase at which the synchronous rectification enable signal Swp21 switches from on to off is also p. Furthermore, the phase change from the phase at which the synchronous rectification enable signal Swp21 switches from on to off to the phase at which the synchronous rectification enable signal Swn13 switches from on to off is (π / 3-p). Therefore, to obtain the same effect for all switching elements when performing synchronous rectification, the time from the end trigger processing of a switching element to the earliest start trigger processing of the other switching elements must be equal. That is, p should satisfy the following equation (2).

number

[0053] Furthermore, the above explanation is for the case of a dual three-phase configuration. When the number of armature winding sets is x (an integer equal to or greater than two) and the number of phases is y (an odd number equal to or greater than three), the optimal phase difference p between the sets should satisfy the following equation (3). By setting the phase difference between the sets to the value obtained by dividing π by the product of x and y, as in equation (3), it becomes possible to update the latest synchronous rectification allowed time Tnew at regular intervals, and it becomes possible to suppress the off-margin time. As a result, the effect of synchronous rectification can be maximized.

number

[0054] Next, a case where the control device for a rotating electric machine according to the first embodiment is used in a vehicle generator motor will be described. FIG. 16 is a schematic diagram illustrating an example in which the rotating electric machine according to the first embodiment is used as a vehicle generator motor. The rotating electric machine 1 is connected to an internal combustion engine 1000 via a belt and a pulley (both of which are not shown) and operates as an auxiliary machine for the internal combustion engine 1000. The rotating electric machine 1 provides driving force to wheels via drivetrain components and generates electricity using the rotation of the internal combustion engine 1000. As described above, synchronous rectification control is performed during power generation, and known PWM control is performed during driving or power generation at low rotation speeds. Since the rotating electric machine 1 is connected to the internal combustion engine 1000, rotational fluctuations are gentle due to the inertia of the internal combustion engine 1000. This makes it possible to reduce the influence of rotational fluctuations during synchronous rectification. By reducing the influence of rotational fluctuations in this way, it is possible to accurately set the margin time. This maximizes the ON period of the synchronous rectification enable signal, thereby further improving the efficiency of synchronous rectification.

[0055] Next, a hardware configuration for realizing each functional unit of the control unit 5 will be described. FIG. 17 is a diagram illustrating an example of the hardware configuration of the control unit according to the first embodiment. The control unit 5 is mainly composed of a processor 81, a memory 82 serving as a main storage device, and an auxiliary storage unit 83. The processor 81 may be, for example, a microcomputer, a central processing unit (CPU), an application-specific integrated circuit (ASIC), a digital signal processor (DSP), or a field programmable gate array (FPGA). The memory 82 may be a volatile storage device such as a random access memory (RAM) that updates and sequentially rewrites stored data. The auxiliary storage unit 83 may be a nonvolatile storage device such as a flash memory, a read-only memory (ROM), or a hard disk. The auxiliary storage unit 83 stores predetermined programs and data such as fixed value data to be executed by the processor 81. The processor 81 reads these programs and fixed value data as appropriate, executes the programs, and performs various arithmetic operations. At this time, the predetermined programs are temporarily stored in the memory 82 from the auxiliary storage unit 83, and the processor 81 reads the programs from the memory 82. The arithmetic processing by each functional unit of the control unit 5 is realized by the processor 81 executing a predetermined program as described above. The results of the arithmetic processing by the processor 81 are temporarily stored in the memory 82, and then stored in the auxiliary storage device 83 according to the purpose of the executed arithmetic processing.

[0056] The control unit 5 also includes an input circuit 84 that receives various inputs from the outside, an output circuit 85 that outputs various types of data to the outside, and a communication device 86 that realizes transmission and reception of various types of communication data.

[0057] According to the first embodiment, the on / off signals of the switching elements can be appropriately set, thereby improving the efficiency of synchronous rectification. More specifically, in a control device 100 controlling a rotating electric machine 1 having dual three-phase armature windings, the phase difference between the groups is set to π / 6, and when performing synchronous rectification, the on / off signals of each switching element of the inverter are determined based on a synchronous rectification enable signal. The synchronous rectification enable signal is generated based on the conduction state of a diode connected in anti-parallel to each switching element. When generating the on / off signal of a switching element, the off timing of the on / off signal is determined using the latest synchronous rectification enable time, which is the length of the on-interval of the synchronous rectification enable signal. By setting the phase difference between the groups as described above, voltage vectors are set at equal intervals without overlap, and the latest synchronous rectification enable time can be updated frequently. By updating the synchronous rectification enable time frequently in this manner, the on / off signals are generated using the latest information, preventing the margin time (off-margin time) from becoming too short even when the rotational speed of the rotating electric machine is increasing. Therefore, there is no need to reserve an extra margin time. Also, when the rotation speed of the rotating electric machine is decreasing, the possibility of setting an excessively long margin time is reduced. Thus, according to the first embodiment, by appropriately setting the margin time, it is possible to appropriately set the on / off signals of the switching elements, thereby improving the efficiency of synchronous rectification.

[0058] Furthermore, since the rotating electric machine is provided with a field winding and the field current flowing through this field winding is controlled, the amount of power generated by the rotating electric machine can be controlled.

[0059] Furthermore, when generating the synchronous rectification enable signal, the conduction state of the diode is detected based on the forward voltage of the diode, thereby suppressing conduction loss.

[0060] Embodiment 2 Next, a second embodiment will be described with reference to FIGS. 18 to 22. Unless otherwise specified, the same or corresponding components as those in FIGS. 1 to 17 are denoted by the same reference numerals. In the first embodiment, the on-timing and off-timing of synchronous rectification are determined based on the synchronous rectification enable signals of all switching elements. In the second embodiment, however, the on-timing and off-timing of synchronous rectification of all switching elements are determined based on the synchronous rectification enable signals of some of the switching elements. In the second embodiment, a synchronous rectification enable signal generator is provided only in the first inverter. FIG. 18 is a schematic diagram showing a control device for a rotating electric machine according to the second embodiment. The control device 100a differs from the control device 100 according to the first embodiment in that the second inverter 4B and the control unit 5 are replaced with a second inverter 4Ba and a control unit 5a, and the second inverter 4Ba does not include a synchronous rectification enable signal generator. Therefore, the synchronous rectification enable signals Swp21 to Swp23 and Swn21 to Swn23 according to the first embodiment are not generated in the second embodiment.

[0061] 19 is a schematic block diagram showing a control unit according to embodiment 2. As described above, in embodiment 2, synchronous rectification permission signals Swp21-Swp23, Swn21-Swn23 are not generated, and therefore only synchronous rectification permission signals Swp11-Swp13, Swn11-Swn13 are input to a synchronous rectification permission time calculation unit 53a of a control unit 5a, and only synchronous rectification permission times Tp11-Tp13, Tn11-Tn13 are calculated. Furthermore, the on / off signal generation unit 54a generates on / off signals Qp11-Qp13, Qn11-Qn13 and on / off signals Qp21-Qp23, Qn21-Qn23 based on the synchronous rectification permission signals Swp11-Swp13, Swn11-Swn13, synchronous rectification permission times Tp11-Tp13, Tn11-Tn13, and the rotation speed ω. The field voltage command calculation unit 51 and the field switching signal generation unit 52 are the same as those in the first embodiment.

[0062] The detailed configuration of the ON / OFF signal generation unit 54a is basically the same as that of the ON / OFF signal generation unit 54 of Embodiment 1. That is, the ON / OFF signal generation unit 54a acquires the latest synchronous rectification permission time value Tnew, which is the latest synchronous rectification permission time, from among the synchronous rectification permission times Tp11 to Tp13 and Tn11 to Tn13, generates an ON counter that determines the ON timing of the ON / OFF signal based on the rotation speed ω, and generates an OFF counter that determines the OFF timing of the ON / OFF signal based on the latest synchronous rectification permission time value Tnew and the rotation speed ω. Here, the on / off signal generating unit 54a generates not only on counters Con_p11-Con_p13, Con_n11-Con_n13 and off counters Coff_p11-Coff_p13, Coff_n11-Coff_n13 corresponding to the input synchronous rectification enable signals Swp11-Swp13, Swn11-Swn13, but also on counters Con_p21-Con_p23, Con_n21-Con_n23 and off counters Coff_p21-Coff_p23, Coff_n21-Coff_n23, and generates on / off signals based on the generated on counters and off counters. That is, it also generates on counters and off counters for the switching elements of the second inverter 4Ba for which no corresponding synchronous rectification enable signals are generated. The on / off signal generating unit 54a generates on / off signals by setting the on timing and off timing of each switching element based on the synchronous rectification enable signals, on counters, and off counters.

[0063] FIG. 20 is a diagram illustrating a method for generating an on-off signal according to the second embodiment. While FIG. 20 illustrates an example in which on-off signals Qp11 and Qp21 are generated, the same applies to other on-off signals. The reason why not only the on-off signal Qp21 but also the on-off signal Qp21 are generated together is that, since the synchronous rectification enable signal Swp21 is not generated in the second embodiment, the synchronous rectification enable signal Swp11, which leads the synchronous rectification enable signal Swp21 by π / 6 in phase, is used to generate the on-off signal Qp21. Note that, for reference, the synchronous rectification enable signal Swp21 is also illustrated in FIG. 20 , but is depicted with a dashed line because it is not actually detected. First, at time tc0 (initial state), the synchronous rectification enable signal Swp11, on counters Con_p11 and Con_p21, off counters Coff_p11 and Coff_p21, and on-off signals Qp11 and Qp21 are all off or zero. When the synchronous rectification permission signal Swp11 switches from OFF to ON at time tc1, the ON / OFF signal generation unit 54a of the control unit 5a performs start trigger processing and starts generating the ON / OFF signals Qp11 and Qp21. Note that, since the synchronous rectification permission time Tp11 has not been determined at time tc1, the ON / OFF signal generation unit 54a uses the latest value Tnew of the synchronous rectification permission time when setting the OFF timing of each of the ON / OFF signals Qp11 and Qp21.

[0064] In the start trigger process, the on / off signal generator 54a acquires the latest value Tnew of the synchronous rectification permission time and sets on counters Con_p11 and Con_p21 and off counters Coff_p11 and Coff_p21. The on counter Con_p11 is set so that the on timing of the on / off signal Qp11 is delayed from time tc1 by an on margin time determined based on the rotational speed ω (time tc2). The on counter Con_p21 is set so that the on timing of the on / off signal Qp21 is delayed from time tc1 by the sum of the time corresponding to the phase difference (π / 6) between the first three-phase armature winding L11 and the second three-phase armature winding L21 and the on margin time determined based on the rotational speed ω (time tc6). The off counter Coff_p11 is set so that the off timing of the on / off signal Qp11 becomes the time (time tc3) obtained by subtracting an off margin time determined based on the rotational speed ω from the synchronous rectification end time (time tc4) based on Tnew. The off counter Coff_p21 is set so that the off timing of the on / off signal Qp21 becomes the time (time tc7) obtained by adding a time corresponding to the phase difference (π / 6) between the first three-phase armature winding L11 and the second three-phase armature winding L21 to the synchronous rectification end time (time tc4) and subtracting an off margin time determined based on the rotational speed ω.

[0065] After setting the off counters that generate the on / off signals as described above, the on / off signals Qp11 and Qp21 are generated in the same manner as in the first embodiment. The same process applies from time tc1 onwards as in the first embodiment, whereby the respective on counters and off counters are decremented, and when the decremented values reach zero, the corresponding switching elements are switched on and off. When the synchronous rectification enable signal Swp11 switches from on to off at time tc8, the control unit 5a performs end trigger processing. The end trigger processing is the same as in the first embodiment, whereby the control unit 5a calculates the synchronous rectification enable time Tp11 and updates the latest value Tnew of the synchronous rectification enable time. At time tc9, the synchronous rectification enable signal Swp21 switches from on to off. However, in the second embodiment, the synchronous rectification enable signal Swp21 has not been detected, so the end trigger processing is not performed.

[0066] As described above, similar to the first embodiment, performing start trigger processing using the switching of the corresponding synchronous rectification enable signal from OFF to ON as a trigger can reduce delays more effectively than fixed-cycle processing.

[0067] FIG. 21 is a diagram showing the synchronous rectification permission signals of each switching element according to the second embodiment, and is a diagram showing an example where the synchronous rectification permission phase is 8 / 9π. "When the synchronous rectification permission phase is 8 / 9π" is an example where the rotation speed ω of the rotating electric machine 1 and the induced voltage due to the rotation of the rotating electric machine 1 are small. In FIG. 21, the synchronous rectification permission signals Swp21 to Swp23 and Swp21 to Swp23, which are not detected in the second embodiment, are also shown with dashed lines. Furthermore, the synchronous rectification permission times Tp21 to Tp23 and Tn21 to Tn23 of these synchronous rectification permission signals are also shown for reference, but are not actually calculated and are therefore crossed out.

[0068] 21 , the synchronous rectification enable signal Swp11 switches from off to on at time ts1, and switches from on to off at time ts12. As described above, the phase difference between the first three-phase armature winding L11 and the second three-phase armature winding L21 is π / 6. Therefore, although not generated in the second embodiment, it is assumed that the synchronous rectification enable signal Swp21 of the switching element Sp21 switches from off to on at time ts3, which is delayed from time ts1 by the time corresponding to the phase of π / 6, and switches off at time ts14, which is delayed from time ts12 by the time corresponding to the phase of π / 6.

[0069] At time ts13, the synchronous rectification enable signal Swn11 of the switching element Sn11 switches from off to on, start trigger processing of the switching elements Sn11 and Sn21 is performed, and generation of the on / off signal Qn11 and the on / off signal Qn21 begins. At this time, the synchronous rectification enable signal that most recently switched from on to off is the synchronous rectification enable signal Swp11, so the synchronous rectification enable time latest value Tnew used to generate the on / off signals Qn11 and Qn21 of the switching elements Sn11 and Sn21 is the synchronous rectification enable time Tp11 of the synchronous rectification enable signal Swp11, and the off counters Coff_n11 and Coff_n21 are determined based on the synchronous rectification enable time latest value Tnew (synchronous rectification enable time Tp11).

[0070] 21, when the induced voltage due to the rotation of the rotating electric machine 1 is small and the synchronous rectification permission phase is short, the time from time ts12 when the latest value of the synchronous rectification permission time Tnew is updated to the synchronous rectification permission time Tp11 to time ts13 when the start trigger processing of the switching elements Sn11 and Sn21 is performed is long, and it is possible to update the latest value of the synchronous rectification permission time Tnew by the end trigger processing of the switching element Sp11. In other words, when the induced voltage due to the rotation of the rotating electric machine 1 is equal to or smaller than a predetermined value, the turn-off timing of the low-potential side switching elements Sn11 and Sn21 can be determined based on the synchronous rectification permission time Tp11 of the high-potential side switching element Sp11. The other switching elements are considered in a similar manner, where x is an integer of 2 or more, y is an odd number of 3 or more, i3 is a natural number not greater than x, and j is a natural number not greater than y, and the off-timing of the high-potential side switching element corresponding to the j-th phase of group i3 and the off-timing of the low-potential side switching element corresponding to the j-th phase of group i3 are determined based on the synchronous rectification allowed time of the low-potential side switching element corresponding to the j-th phase of group 1 and the synchronous rectification allowed time of the high-potential side switching element corresponding to the j-th phase of group 1, respectively.

[0071] Fig. 22 is a diagram showing the synchronous rectification permission signals of each switching element according to embodiment 2, and is a diagram showing an example where the synchronous rectification permission phase is π. The example shown in Fig. 21 is an example where the induced voltage due to the rotation of the rotating electric machine 1 is small, but the example shown in Fig. 22 is an example where the induced voltage due to the rotation of the rotating electric machine 1 is large. Note that in Fig. 22 as well, synchronous rectification permission signals that are not detected are shown with dashed lines, and synchronous rectification permission times that are not calculated are shown with strikethroughs.

[0072] 22, the synchronous rectification enable signal Swp11 of the switching element Sp11 switches from off to on at time ts31, and switches from on to off at time ts37. Because the phase difference between the first three-phase armature winding L11 and the second three-phase armature winding L21 is π / 6, although this is not detected in the second embodiment, it is assumed that the synchronous rectification enable signal Swp21 of the switching element Sp21 switches from off to on at time ts32, which is delayed from time ts31 by a time corresponding to the phase of π / 6, and switches from on to off at time ts38, which is delayed from time ts37 by a time corresponding to the phase of π / 6.

[0073] At time ts37, the synchronous rectification enable signal Swn11 of the switching element Sn11 switches from off to on, start trigger processing of the switching elements Sn11 and Sn21 is performed, and generation of the on-off signal Qn11 and the on-off signal Qn21 begins. At this time, the synchronous rectification enable signal that switched from on to off most recently is the synchronous rectification enable signal Swp11. However, the timing at which the synchronous rectification enable time Tp11 is determined and the timing at which the start trigger processing of the switching elements Sn11 and Sn21 is performed are the same, and there is no time to update the latest value Tnew of the synchronous rectification enable time to the synchronous rectification enable time Tp11. Therefore, the latest value Tnew of the synchronous rectification enable time is the synchronous rectification enable time Tn12 that was determined at time ts35. As a result, the synchronous rectification allowed time Tn12 is used in the start trigger process of the switching element Sn21, and the OFF counters Coff_n11 and Coff_n21 are determined based on the synchronous rectification allowed time Tn12, which is the latest value Tnew of the synchronous rectification allowed time.

[0074] 14, when the induced voltage due to the rotation of the rotary electric machine 1 is large and the synchronous rectification permitted phase is large, the latest value Tnew of the synchronous rectification permitted time cannot be updated in time as described above, and the latest value Tnew of the synchronous rectification permitted time obtained by the immediately previous update is used. However, in the example shown in FIG. 22, there is no end trigger process between time ts36 and time ts37, and the latest value Tnew of the synchronous rectification permitted time obtained by the update performed even earlier (between time ts35 and time ts36) is used.

[0075] In other words, when the induced voltage due to the rotation of the rotating electric machine 1 is greater than a predetermined value, the off-timing of the low-side switching elements Sn11 and Sn21 can be determined based on the synchronous rectification enabled time Tn12 of the low-side switching element Sn12. The same applies to the other switching elements. Let x be an integer equal to or greater than 2, y be an odd number equal to or greater than 3, i4 be a natural number equal to or less than x, and j be a natural number equal to or less than y. Furthermore, let j** satisfy the following equation (4). The off-timing of the high-side switching element corresponding to the j-th phase in the i4th group and the off-timing of the low-side switching element corresponding to the j-th phase in the i4th group are determined based on the synchronous rectification enabled time of the high-side switching element corresponding to the j**-phase in the 1st group and the synchronous rectification enabled time of the low-side switching element corresponding to the j**-phase in the 1st group, respectively. This ensures sufficient processing time even when the induced voltage is large and the synchronous rectification enabled phase is long.

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[0076] According to the second embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, a synchronous rectification enable signal is generated in only one of the two inverters, and this synchronous rectification enable signal is used to generate on / off signals for the switching elements of both inverters, thereby reducing the amount of signals to be processed and simplifying signal processing.

[0077] In the second embodiment, among the switching elements corresponding to the respective armature windings, a synchronous rectification enable signal is generated only for the switching elements corresponding to the first set of armature windings. The on / off signals for the switching elements corresponding to the second set of armature windings, for which a synchronous rectification enable signal is not generated, are generated in accordance with the generation of the on / off signals for the same-phase switching elements among the switching elements corresponding to the first set of armature windings. This configuration can also be applied to cases other than the dual three-phase configuration as in the second embodiment. For example, in a three-set three-phase configuration in which a synchronous rectification enable signal is generated only for the first set, when the on / off signal for the second-phase switching element of the first set is generated, the on / off signals for the same-phase switching elements of the other sets, such as the second-phase switching element of the second set and the second-phase switching element of the third set, are also generated. Furthermore, in this case, the on / off signals for the second-phase switching elements of the second set and the third set of second-phase switching elements are generated based on the same synchronous rectification enable signal as the synchronous rectification enable signal used to generate the on / off signal for the second-phase switching element of the first set. Since the phase difference between the groups is predetermined, when generating on / off signals for in-phase switching elements of different groups, the on counters and off counters may be generated taking the phase difference between the groups into consideration.

[0078] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0079] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) A control device for a rotating electric machine that controls a rotating electric machine having a plurality of sets of armature windings, each set having an odd number of phases equal to or greater than three, and that converts AC power supplied from the rotating electric machine into DC power by synchronous rectification, comprising: a plurality of power conversion units each corresponding to one of the sets of armature windings, each connected between the corresponding armature winding and a DC power source, each including a series connection of a high-potential side switching element and a low-potential side switching element corresponding to each phase of the corresponding armature winding, and a plurality of diodes connected in anti-parallel to each of the switching elements; a synchronous rectification enable signal generation unit that detects a conduction state of each of the diodes for at least one of the power conversion units and generates a synchronous rectification enable signal corresponding to each of the switching elements based on the conduction state; a control unit including a synchronous rectification permission time calculation unit that calculates a synchronous rectification permission time, which is the length of an on-section of the synchronous rectification permission signal, and an on-off signal generation unit that generates on-off signals that switch on and off each of the switching elements based on the synchronous rectification permission time, where x is the number of the groups and y is the number of the phases, a phase difference between the groups in the plurality of groups of armature windings is set equal to a value obtained by dividing π by the product of x and y, The control device for a rotating electric machine is characterized in that the on / off signal generation unit acquires a latest value of a synchronous rectification permission time, which is the latest synchronous rectification permission time at the time of generation of the on / off signal, and determines an off timing of the on / off signal based on the latest value of the synchronous rectification permission time. (Appendix 2) the synchronous rectification enable signal generation unit is provided for all of the power conversion units of the plurality of power conversion units corresponding to each set of the armature windings, The control device for a rotating electric machine according to Appendix 1, wherein when an induced voltage generated by rotation of the rotating electric machine is equal to or less than a predetermined value, the on / off signal generation unit determines the off timing of the high potential side switching element corresponding to the jth phase of group i1 and the off timing of the low potential side switching element corresponding to the jth phase of group i1, where i1 is an integer equal to or less than x and j is a natural number equal to or less than y, based on the synchronous rectification permission time of the low potential side switching element corresponding to the jth phase of group i1 and the synchronous rectification permission time of the high potential side switching element corresponding to the jth phase of group i1, respectively. (Appendix 3) the synchronous rectification enable signal generation unit is provided for all of the power conversion units of the plurality of power conversion units corresponding to each set of the armature windings, The control device for a rotating electric machine according to Appendix 1, wherein the on / off signal generation unit determines the off-timing of the high potential side switching element corresponding to the j-th phase of group i2 and the off-timing of the low potential side switching element corresponding to the j-th phase of group i2, where i2 is a natural number greater than or equal to 2 and less than or equal to x, and j is a natural number less than or equal to y, based on a synchronous rectification allowed time of the low potential side switching element corresponding to the j-th phase of group i2-1 and a synchronous rectification allowed time of the high potential side switching element corresponding to the j-th phase of group i2-1, respectively. (Appendix 4) the synchronous rectification permission signal generation unit determines the off-timing of the high potential side switching element corresponding to the j-th phase of the first group and the off-timing of the low potential side switching element corresponding to the j-th phase of the first group based on a synchronous rectification permission time of the high potential side switching element corresponding to the j*-th phase of the x-th group and a synchronous rectification permission time of the low potential side switching element corresponding to the j*-th phase of the x-th group, respectively, where j* satisfies the following formula (1):

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[0080] REFERENCE SIGNS LIST 1 Rotating electric machine, 2 DC power supply, 3 Converter, 4A First inverter, 4B, 4Ba Second inverter, 5, 5a Control unit, 41A, 41B Full bridge circuit unit, 42A, 42B Synchronous rectification permission signal generation unit, 51 Field voltage command calculation unit, 52 Field switching signal generation unit, 53, 53a Synchronous rectification permission time calculation unit, 54, 54a On / off signal generation unit, 100, 100a Control device, 541 Latest value acquisition unit, 542 On counter generation unit, 543 Off counter generation unit, 1000 Internal combustion engine, Coff_p11 to Coff_p13, Coff_n11 to Coff_n13, Coff_p21 to Coff_p23, Coff_n21 to Coff_n23 Off counter, Con_p11 to Con_p13, Con_n11 to Con_n13, Con_p21 to Con_p23, Con_n21 to Con_n23 On counter, Dp11 to Dp13, Dp21 to Dp23, Dn11 to Dn13, Dn21 to Dn23 Diode, L11 to L13 First three-phase armature winding, L21 to L23 Second three-phase armature winding, Lf Field winding, Qp11 to Qp13, Qp21 to Qp23, Qn11 to Qn13, Qn21 to Qn23 On / off signal, Sp11 to Sp13, Sp21 to Sp23, Sn11 to Sn13, Sn21 to Sn23 Switching elements, Swp11 to Swp13, Swp21 to Swp23, Swn11 to Swn13, Swn21 to Swn23 Synchronous rectification enable signal, Tp11 to Tp13, Tp21 to Tp23, Tn11 to Tn13, Tn21 to Tn23 Synchronous rectification enable time, Tnew Latest value of synchronous rectification enable time, Vdf Forward voltage, ω Rotation speed

Claims

1. A control device for a rotating electric machine that controls a rotating electric machine having a plurality of sets of armature windings, each set having an odd number of phases equal to or greater than three, and that converts AC power supplied from the rotating electric machine into DC power by synchronous rectification, comprising: a plurality of power conversion units each corresponding to one of the sets of armature windings, each connected between the corresponding armature winding and a DC power source, each including a series connection of a high-potential side switching element and a low-potential side switching element corresponding to each phase of the corresponding armature winding, and a plurality of diodes connected in anti-parallel to each of the switching elements; a synchronous rectification enable signal generation unit that detects a conduction state of each of the diodes for at least one of the power conversion units and generates a synchronous rectification enable signal corresponding to each of the switching elements based on the conduction state; a control unit including a synchronous rectification permission time calculation unit that calculates a synchronous rectification permission time, which is the length of an on-section of the synchronous rectification permission signal, and an on-off signal generation unit that generates on-off signals that switch on and off each of the switching elements based on the synchronous rectification permission time, where x is the number of the groups and y is the number of the phases, a phase difference between the groups in the plurality of groups of armature windings is set equal to a value obtained by dividing π by the product of x and y, The control device for a rotating electric machine, characterized in that the on / off signal generation unit acquires a latest value of synchronous rectification allowed time, which is the latest synchronous rectification allowed time at the time of generation of the on / off signal, and determines the off timing of the on / off signal based on the latest value of synchronous rectification allowed time.

2. the synchronous rectification enable signal generation unit is provided for all of the power conversion units of the plurality of power conversion units corresponding to each set of the armature windings, 2. The control device for a rotating electric machine according to claim 1, wherein when an induced voltage generated by rotation of the rotating electric machine is equal to or less than a predetermined value, the on / off signal generating unit determines the off timing of the high potential side switching element corresponding to the jth phase of group i1 and the off timing of the low potential side switching element corresponding to the jth phase of group i1, where i1 is an integer equal to or less than x and j is a natural number equal to or less than y, based on the synchronous rectification allowed time of the low potential side switching element corresponding to the jth phase of group i1 and the synchronous rectification allowed time of the high potential side switching element corresponding to the jth phase of group i1, respectively.

3. the synchronous rectification enable signal generation unit is provided for all of the power conversion units of the plurality of power conversion units corresponding to each set of the armature windings, 2. The control device for a rotating electric machine according to claim 1, wherein the on / off signal generation unit determines the off timing of the high potential side switching element corresponding to the j phase of group i2 and the off timing of the low potential side switching element corresponding to the j phase of group i2, where i2 is a natural number greater than or equal to 2 and less than x, and j is a natural number less than y, based on a synchronous rectification allowed time of the low potential side switching element corresponding to the j phase of group i2-1 and a synchronous rectification allowed time of the high potential side switching element corresponding to the j phase of group i2-1, respectively.

4. 4. The control device for a rotating electric machine according to claim 3, wherein the synchronous rectification permission signal generation unit determines the off-timing of the high potential side switching element corresponding to the j phase of the first group and the off-timing of the low potential side switching element corresponding to the j phase of the first group based on a synchronous rectification permission time of the high potential side switching element corresponding to the j* phase of the xth group and a synchronous rectification permission time of the low potential side switching element corresponding to the j* phase of the xth group, respectively, and j* satisfies the following equation (1): [Equation 1]

5. 2. The control device for a rotating electric machine according to claim 1, wherein the on / off signal generating unit generates the on / off signal of the target switching element at a timing when the synchronous rectification enable signal corresponding to the switching element for which the on / off signal is generated switches from off to on.

6. a storage unit for storing the latest value of the synchronous rectification allowance time, The control device for a rotating electric machine according to claim 1 , wherein the control unit updates the latest value of the synchronous rectification permission time at the timing when the synchronous rectification permission signal switches from on to off.

7. 2. The control device for a rotating electric machine according to claim 1, wherein the on / off signal generating unit determines an off-margin time based on a rotation speed of the rotating electric machine, and determines the off timing based on a time obtained by subtracting the off-margin time from a synchronous rectification end time based on the latest value of the synchronous rectification allowed time.

8. 2. The control device for a rotating electric machine according to claim 1, wherein the on / off signal generating unit determines an on margin time based on a rotation speed of the rotating electric machine, and sets the on timing of the on / off signal to a time delayed by the on margin time from a timing at which the synchronous rectification enable signal corresponding to the switching element for which the on / off signal is generated switches from off to on.

9. 2. The control device for a rotating electric machine according to claim 1, wherein the synchronous rectification enable signal generation unit is provided for only some sets of power conversion units among the plurality of power conversion units corresponding to the armature windings of each set, and when generating an on / off signal for a switching element of a specific phase of the some sets, the on / off signal generation unit also generates an on / off signal for the switching element of a different set from the some sets and of the same phase as the specific phase, based on the synchronous rectification enable signal corresponding to the switching element.

10. the synchronous rectification enable signal generation unit is provided only for the power conversion unit corresponding to the first set of armature windings, 10. The control device for a rotary electric machine according to claim 9, wherein when an induced voltage generated by rotation of the rotary electric machine is equal to or less than a predetermined value, the on / off signal generation unit determines the off-timing of the high potential side switching element corresponding to the jth phase of the i3th group, where i3 is a natural number equal to or less than x, and j is a natural number equal to or less than y, and the off-timing of the low potential side switching element corresponding to the jth phase of the i3th group, based on a synchronous rectification allowed time of the low potential side switching element corresponding to the jth phase of the 1st group and a synchronous rectification allowed time of the high potential side switching element corresponding to the jth phase of the 1st group, respectively.

11. the synchronous rectification enable signal generation unit is provided only for the power conversion unit corresponding to the first set of armature windings, 10. The control device for a rotating electric machine according to claim 9, wherein the on / off signal generation unit determines the off-timing of the high potential side switching element corresponding to the j-th phase of the i4th group and the off-timing of the low potential side switching element corresponding to the j-th phase of the i4th group, where i4 is a natural number equal to or less than x and j is a natural number equal to or less than y, based on a synchronous rectification permission time of the high potential side switching element corresponding to the j**-th phase of the 1st group and a synchronous rectification permission time of the low potential side switching element corresponding to the j**-th phase of the 1st group, respectively, and j** satisfies the following equation (4): [Equation 4]

12. 12. The control device for a rotating electric machine according to claim 1, further comprising a converter that converts a DC voltage supplied from the DC power supply into power and applies the converted DC voltage to a field winding provided in the rotating electric machine.

13. The control device for a rotating electric machine according to any one of claims 1 to 11, wherein the rotating electric machine is a generator motor for a vehicle.

14. The control device for a rotating electric machine according to claim 12, wherein the rotating electric machine is a generator motor for a vehicle.

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