Transformer control device and power conversion device

Abstract

To provide a transformation control device with which vibration of a rotary electric machine can be suppressed.SOLUTION: A transformation control device includes a voltage control unit that generates a current command value on the basis of a transformation target value of a transformation circuit connected to a rotary electric machine and a state amount of the rotary electric machine, and a current control unit that generates a voltage command value on the basis of the current command value. In the transformation control device, an operation amount generated on the basis of the voltage command value is outputted to a driving signal generation circuit to perform feedback control on the transformation circuit. The transformation control device includes a first gain adjustment unit that adjusts a proportional voltage gain in the voltage control unit to be greater than a normal gain, within a small current operation region in which a reactor current in the transformation circuit is smaller than a prescribed current threshold, and a second gain adjustment unit that, when the rotation speed of the rotary electric machine is equal to a specific rotation speed, adjusts a proportional current gain in the current control unit to be greater than a normal gain.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transformer control device and a power conversion device. [Background technology]

[0002] Patent Document 1 listed below discloses a control device (multiphase converter control device) for a multiphase converter that drives a motor via an inverter. This multiphase converter control device PWM controls the drive of a multiphase converter in which multiple converters, each magnetically coupled to another reactor, are connected in parallel and generate a boosted voltage by boosting an input voltage, and includes a feedback control unit that performs feedback control so that the boosted voltage becomes a target voltage, a PWM control unit that generates a PWM signal based on a voltage command value output from the feedback control unit, and a drive unit that drives the multiphase converter based on the PWM signal, and the feedback control unit changes a control gain in the feedback control based on the boost ratio of the multiphase converter, thereby improving the controllability of the multiphase converter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-141713 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned background art changes either or both of the proportional gain and the integral gain based on the step-up ratio, and although it can improve the controllability of the multi-phase converter, it does not take into consideration the suppression of vibrations of the motor driven by the multi-phase converter. Therefore, the background art cannot suppress vibrations of rotating electrical machines, such as motors and generators, connected to the multi-phase converter.

[0005] When controlling a transformer circuit such as a multi-phase converter, fluctuations in the output current of the transformer circuit induce vibrations in the motor, but the background art is not capable of suppressing vibrations in a rotating electric machine caused by fluctuations in the output current of such a transformer circuit.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a transformer control device and a power conversion device that are capable of suppressing vibrations of a rotating electric machine. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention adopts, as a first solution related to a transformer control device, a transformer control device comprising at least a voltage control unit that generates a current command value based on a transformation target value of a transformer circuit connected to a rotating electric machine and a state quantity of the rotating electric machine, and a current control unit that generates a voltage command value based on the current command value, and outputs an operation quantity generated based on the voltage command value to a drive signal generation circuit to feedback control the transformer circuit, and further comprising: a first gain adjustment unit that increases the proportional voltage gain of the voltage control unit above a normal gain in a small current operating region where the reactor current of the transformer circuit is smaller than a predetermined current threshold, and a second gain adjustment unit that increases the proportional current gain of the current control unit above a normal gain when the rotation speed of the rotating electric machine is a specific rotation speed.

[0008] In the present invention, as a second solution related to a transformer control device, in the first solution, when the drive signal generation circuit generates a drive signal provided with a dead time, The first gain adjustment section employs a means for increasing the integral current gain of the current control section in the small current operating region to a value greater than the normal gain.

[0009] The present invention employs, as a third solution related to the transformation control device, the solution in the first or second solution, in which the transformation circuit is a magnetically coupled multi-phase converter.

[0010] In the present invention, as a solution relating to a power conversion device, a means is adopted which comprises a transformer control device relating to any one of the first to third solutions, the transformer circuit controlled by the transformer control device, a drive inverter provided between the transformer circuit and a motor, which converts DC power input from the transformer circuit into AC power and outputs it to the motor, and a power generation inverter provided between the transformer circuit and a generator, which converts AC power input from the generator into DC power and outputs it to the transformer circuit. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a transformer control device and a power conversion device that are capable of suppressing vibrations of a rotating electric machine. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a functional configuration of a power conversion device A in one embodiment of the present invention. [Figure 2] 3 is a block diagram showing the functional configuration of a voltage transformation control unit B in one embodiment of the present invention. FIG. [Figure 3] 3 is a characteristic diagram showing the function of a first gain adjuster 14 in one embodiment of the present invention. FIG. [Figure 4] 4 is a characteristic diagram showing the function of a second gain adjuster 15 in one embodiment of the present invention. FIG. [Figure 5] 4 is a flowchart showing the operation of a main part of a power conversion device A (control operation of a transformation control unit B) according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the functional configuration of the power conversion device A in this embodiment will be described with reference to Fig. 1. As shown in the figure, this power conversion device A is provided between a battery P, a traveling motor M, and a three-phase generator J, and converts the battery power (DC power) of the battery P and the AC power of the traveling motor M and the three-phase generator J.

[0014] The power conversion device A is a PCU (Power Control Unit) mounted on an electric vehicle such as a hybrid vehicle or an electric car, and drives the traction motor M based on the DC power of the battery P, charges the battery P with the regenerated power (AC power) of the traction motor M, and also charges the battery P with the generated power (AC power) of the three-phase generator J.

[0015] As shown in the figure, such a power conversion device A includes a power conversion circuit 1, a gate driver 2, and an ECU (Electronic Control Unit) 3. As shown in the figure, the gate driver 2 includes a transformation gate signal generator 2a, a drive gate signal generator 2b, and a power generation gate signal generator 2c. As shown in the figure, the power conversion circuit 1 also includes a step-up / step-down converter D1, a drive inverter D2, and a power generation inverter D3.

[0016] As will be described in detail later, the ECU 3 includes, as functional components, a transformation control unit that controls the step-up / step-down converter D1 via a transformation gate signal generation unit 2a, a drive control unit that controls the drive inverter D2 via a drive gate signal generation unit 2b, and a power generation control unit that controls the power generation inverter D3 via a power generation gate signal generation unit 2c.

[0017] Here, in the power conversion device A, the voltage transformation gate signal generation unit 2a, the voltage step-up / step-down converter D1, and the transformation control unit of the ECU 3 constitute a transformer that converts DC power and AC power between the battery P and the traction motor M and the generator J. In addition, the voltage transformation gate signal generation unit 2a and the transformation control unit of the ECU 3 constitute a transformation control device that controls the voltage step-up / step-down converter D1 of the power conversion circuit 1.

[0018] The power conversion device A has, as external connection terminals, a pair of battery terminals E1 and E2, three motor terminals Fu, Fv, and Fw, and three generator terminals Hu, Hv, and Hw. Of the pair of battery terminals E1 and E2, the first battery terminal E1 is connected to the positive electrode of a battery P, and the second battery terminal E2 is connected to the negative electrode of the battery P.

[0019] Of the three motor terminals Fu, Fv, and Fw, the first motor terminal Fu is connected to the U-phase terminal of the driving motor M, the second motor terminal Fv is connected to the V-phase terminal of the driving motor M, and the third motor terminal Fw is connected to the W-phase terminal of the driving motor M.

[0020] Of the three generator terminals Hu, Hv, and Hw, the first generator terminal Hu is connected to the U-phase terminal of generator J, the second generator terminal Hv is connected to the V-phase terminal of generator J, and the third generator terminal Hw is connected to the W-phase terminal of generator J.

[0021] As described above, the positive electrode of the battery P is connected to the first battery terminal E1, and the negative electrode is connected to the second battery terminal E2. The battery P is a secondary battery such as a lithium ion battery, and supplies (discharges) DC power to the power conversion circuit 1 of the power conversion device A and charges the DC power via the power conversion circuit 1.

[0022] The traveling motor M is a rotating electric machine connected to the power conversion device A. This traveling motor M is a three-phase electric motor with three phases, and is a load of the power conversion circuit 1. As described above, the U-phase terminal of this traveling motor M is connected to the first motor terminal Fu, the V-phase terminal is connected to the second motor terminal Fv, and the W-phase terminal is connected to the third motor terminal Fw.

[0023] The driving motor M has a rotating shaft (drive shaft) connected to the wheels of the electric vehicle, and applies rotational power to the wheels to rotate them. The driving motor M also generates regenerative power (AC power) when braking the electric vehicle. This regenerative power is input to the power conversion device A via the first motor terminal Fu, the second motor terminal Fv, and the third motor terminal Fw, where it is converted into DC power and charged into the battery P.

[0024] The generator J is a rotating electric machine connected to the power conversion device A. This generator J is a three-phase generator, with a U-phase terminal connected to the first generator terminal Hu, a V-phase terminal connected to the second generator terminal Hv, and a W-phase terminal connected to the third generator terminal Hw. This generator J is connected to the output shaft of a power source such as an engine mounted on an electric vehicle, and outputs generated power (AC power) to the power conversion circuit 1.

[0025] The step-up / step-down converter D1 includes a first capacitor 4, a transformer 5, four transformer IGBTs (Insulated Gate Bipolar Transistors) 6a to 6d, and a second capacitor 7. The drive inverter D2 includes six drive IGBTs 8a to 8f, and the power generation inverter D3 includes six power generation IGBTs 9a to 9f.

[0026] The buck-boost converter D1 is a magnetically coupled multi-phase converter. This magnetically coupled multi-phase converter is also called a magnetically coupled interleaved chopper circuit, and is configured by connecting two chopper circuits with different operating phases in parallel. As described above, the buck-boost converter D1 is a magnetically coupled interleaved chopper circuit that selectively performs voltage step-up processing and voltage step-down processing.

[0027] The step-up process is a process of stepping up battery power (DC power) input from a pair of battery terminals E1, E2 and outputting it to the drive inverter D2. The step-down process is a process of stepping down DC power input from the drive inverter D2 or the power generation inverter D3 and outputting it from the pair of battery terminals E1, E2 to the battery P. In other words, the step-up / step-down converter D1 is a power conversion circuit that inputs and outputs DC power bidirectionally between the battery P and the drive inverter D2 or the power generation inverter D3.

[0028] The drive inverter D2 has three switching legs, three of which are provided corresponding to the number of phases (three phases) of the traction motor M. The three switching legs are a U-phase drive switching leg, a V-phase drive switching leg, and a W-phase drive switching leg. The drive inverter D2 is a power conversion circuit that selectively performs power running operation and regenerative operation.

[0029] The power running operation is an operation in which DC power input from the buck-boost converter D1 is converted into three-phase AC power and output from the three motor terminals Fu, Fv, and Fw to the traction motor M. The regenerative operation is an operation in which regenerative power (AC power) input to the three motor terminals Fu, Fv, and Fw is converted into DC power and output to the buck-boost converter D1. The drive inverter D2 is a power circuit that converts DC power and three-phase AC power between the buck-boost converter D1 and the traction motor M.

[0030] The power generation inverter D3 is a power conversion circuit that converts the generated power (AC power) input to three generator terminals Hu, Hv, and Hw into DC power and outputs it to the step-up / step-down converter D1. The power generation inverter D3 is a power circuit that converts DC power and three-phase AC power between the step-up / step-down converter D1 and the generator J.

[0031] The configurations of the buck-boost converter D1, drive inverter D2, and power generation inverter D3 will be described in more detail below. In the buck-boost converter D1, one end of the first capacitor 4 is connected to the first battery terminal E1 and the transformer 5, and the other end is connected to the second battery terminal E2. Both ends of the first capacitor 4 are primary side terminals of the buck-boost converter D1.

[0032] That is, the first capacitor 4 is connected in parallel to the battery P and removes high-frequency noise contained in the battery power (DC power) input from the battery P to the step-up / step-down converter D1. The first capacitor 4 also smoothes ripples contained in the charging power (DC power) input from the transformer 5.

[0033] The transformer 5 includes a primary winding 5a and a secondary winding 5b. One end of the primary winding 5a and one end of the secondary winding 5b are connected to the first battery terminal E1 and one end of the first capacitor 4. The other end of the primary winding 5a is connected to the emitter terminal of the first transformer IGBT 6a and the collector terminal of the second transformer IGBT 6b. The other end of the secondary winding 5b is connected to the emitter terminal of the third transformer IGBT 6c and the collector terminal of the fourth transformer IGBT 6d.

[0034] The primary winding 5a and secondary winding 5b are electromagnetically coupled with a predetermined coupling coefficient k to form the transformer 5. That is, the primary winding 5a has a first self-inductance La according to the number of turns of the primary winding 5a. Meanwhile, the secondary winding 5b has a second self-inductance Lb according to the number of turns of the secondary winding 5b. Furthermore, the primary winding 5a and secondary winding 5b have a mutual inductance based on the above-mentioned first self-inductance La, second self-inductance Lb, and coupling coefficient k.

[0035] Of the four transformer IGBTs 6a to 6d, the first transformer IGBT 6a and the second transformer IGBT 6b are semiconductor switching elements that form an A-phase transformer switching leg in the step-up / step-down converter D1, while the third transformer IGBT 6c and the fourth transformer IGBT 6d are semiconductor switching elements that form a B-phase switching leg in the step-up / step-down converter D1.

[0036] The first transformation IGBT 6a has a collector terminal connected to the collector terminal of the third transformation IGBT 6c and one end of the second capacitor 7, and an emitter terminal connected to the other end of the primary winding 5a of the transformer 5 and the collector terminal of the second transformation IGBT 6b. The first transformation IGBT 6a also has a gate terminal connected to a first output terminal for the step-up / step-down converter D1 of the gate driver 2. The ON / OFF operation of the first transformation IGBT 6a is controlled based on a first transformation gate signal input from a transformation gate signal generation unit 2a of the gate driver 2.

[0037] The second transformer IGBT 6b has a collector terminal connected to the other end of the primary winding 5a of the transformer 5 and the emitter terminal of the first transformer IGBT 6a, and an emitter terminal connected to the emitter terminal of the fourth transformer IGBT 6d, the other end of the first capacitor 4, and the other end of the second capacitor 7. In addition, the second transformer IGBT 6b has a gate terminal connected to a second output terminal for the step-up / step-down converter D1 in the gate driver 2. The ON / OFF operation of this second transformer IGBT 6b is controlled based on a second transformation gate signal input from the transformation gate signal generation unit 2a of the gate driver 2.

[0038] The third transformation IGBT 6c has a collector terminal connected to the collector terminal of the first transformation IGBT 6a and one end of the second capacitor 7, and an emitter terminal connected to the other end of the secondary winding 5b of the transformer 5 and the collector terminal of the fourth transformation IGBT 6d. The third transformation IGBT 6c also has a gate terminal connected to a third output terminal for the step-up / step-down converter D1 in the gate driver 2. The ON / OFF operation of the third transformation IGBT 6c is controlled based on a third transformation gate signal input from the transformation gate signal generation unit 2a of the gate driver 2.

[0039] The fourth transformer IGBT 6d has a collector terminal connected to the other end of the secondary winding 5b of the transformer 5 and the emitter terminal of the third transformer IGBT 6c, and an emitter terminal connected to the emitter terminal of the first transformer IGBT 6a, the other end of the first capacitor 4, and the other end of the second capacitor 7. In addition, the fourth transformer IGBT 6d has a gate terminal connected to a fourth output terminal for the step-up / step-down converter D1 in the gate driver 2. The ON / OFF operation of the fourth transformer IGBT 6d is controlled based on a fourth transformation gate signal input from the transformation gate signal generation unit 2a of the gate driver 2.

[0040] The second capacitor 7 has one end connected to the collector terminal of the first transformer IGBT 6a and the collector terminal of the third transformer IGBT 6c, and the other end connected to the emitter terminal of the second transformer IGBT 6b, the emitter terminal of the fourth transformer IGBT 6d, the other end of the first capacitor 4, and the second battery terminal E2. Both ends of the second capacitor 7 are secondary-side input / output terminals of the buck-boost converter D1.

[0041] The second capacitor 7 smoothes ripples contained in the boosted power (DC power) input from the above-mentioned A-phase transformation switching leg and B-phase transformation switching leg, and also smoothes ripples contained in the regenerated power (DC power) input from the drive inverter D2 and the charging power (DC power) input from the power generation inverter D3.

[0042] 1, the buck-boost converter D1 is provided with a primary-side voltage sensor, a secondary-side voltage sensor, and a reactor current sensor as detectors for detecting state quantities of the buck-boost converter D1. The primary-side voltage sensor is a voltage sensor that detects a primary voltage Vp (DC voltage) on the primary side of the buck-boost converter D1, i.e., on the battery P side, and outputs the primary voltage Vp to the ECU 3.

[0043] The secondary-side voltage sensor is a voltage sensor that detects a secondary voltage Vs (DC voltage) on the secondary side of the step-up / step-down converter D1, i.e., on the drive inverter D2 side (power generation inverter D3 side), and outputs the secondary voltage Vs to the ECU 3. Note that the secondary voltage Vs is the primary-side voltage of the drive inverter D2 and also the voltage on the secondary side of the power generation inverter D3.

[0044] The reactor current sensor measures the total current of the primary current flowing through the primary winding 5a of the transformer 5 and the secondary current flowing through the secondary winding 5b as the reactor current I L This reactor current sensor detects the reactor current I L is output to the ECU 3 as the state quantity of the step-up / step-down converter D1. L corresponds to a power running current flowing from the primary side to the secondary side in the step-up / step-down converter D1, or a regenerative current or a charging current flowing from the secondary side to the primary side.

[0045] Next, the drive inverter D2 will be described. The drive inverter D2 is an inverter circuit that is provided between the step-up / step-down converter D1, which is a transformer circuit, and the traveling motor M, and converts DC power input from the step-up / step-down converter D1 (transformer circuit) into AC power to drive the traveling motor M.

[0046] Of the six drive IGBTs 8a-8f that make up this drive inverter D2, the first drive IGBT 8a and the second drive IGBT 8b are semiconductor switching elements that make up a U-phase drive switching leg, the third drive IGBT 8c and the fourth drive IGBT 8d are semiconductor switching elements that make up a V-phase drive switching leg, and the fifth drive IGBT 8e and the sixth drive IGBT 8f are semiconductor switching elements that make up a W-phase drive switching leg.

[0047] Of the first drive IGBT 8a and the second drive IGBT 8b, the collector terminal of the first drive IGBT 8a is connected to the collector terminal of the third drive IGBT 8c and the collector terminal of the fifth drive IGBT 8e, and the emitter terminal of the first drive IGBT 8a is connected to the collector terminal of the second drive IGBT 8b and the first motor terminal Fu.

[0048] The first drive IGBT 8a has a gate terminal connected to a first output terminal for a drive inverter D2 in the gate driver 2. The ON / OFF operation of the first drive IGBT 8a is controlled based on a first drive gate signal input from a drive gate signal generation unit 2b of the gate driver 2.

[0049] The second drive IGBT 8b has a collector terminal connected to the emitter terminal of the first drive IGBT 8a and the first motor terminal Fu, and an emitter terminal connected to the emitter terminal of the fourth drive IGBT 8d and the emitter terminal of the sixth drive IGBT 8f.

[0050] The second drive IGBT 8b has a gate terminal connected to a second output terminal for the drive inverter D2 in the gate driver 2. The ON / OFF operation of the second drive IGBT 8b is controlled based on a second drive gate signal input from the drive gate signal generation unit 2b of the gate driver 2.

[0051] The third drive IGBT 8c has a collector terminal connected to the collector terminal of the first drive IGBT 8a and the collector terminal of the fifth drive IGBT 8e, and an emitter terminal connected to the collector terminal of the fourth drive IGBT 8d and the second motor terminal Fv.

[0052] Furthermore, the gate terminal of the third drive IGBT 8c is connected to the second output terminal for the drive inverter D2 in the gate driver 2. The ON / OFF operation of the third drive IGBT 8c is controlled based on a third drive gate signal input from the drive gate signal generation unit 2b of the gate driver 2.

[0053] The fourth drive IGBT 8d has a collector terminal connected to the emitter terminal of the third drive IGBT 8c and the second motor terminal Fv, and an emitter terminal connected to the emitter terminal of the second drive IGBT 8b and the emitter terminal of the sixth drive IGBT 8f.

[0054] The gate terminal of the fourth drive IGBT 8d is connected to a fourth output terminal for the drive inverter D2 in the gate driver 2. The ON / OFF operation of the fourth drive IGBT 8d is controlled based on a fourth drive gate signal input from the drive gate signal generation unit 2b of the gate driver 2.

[0055] The fifth drive IGBT 8e has a collector terminal connected to the collector terminal of the first drive IGBT 8a and the collector terminal of the third drive IGBT 8c, and an emitter terminal connected to the collector terminal of the sixth drive IGBT 8f and the third motor terminal Fw.

[0056] The gate terminal of the fifth drive IGBT 8e is connected to a fifth output terminal for the drive inverter D2 in the gate driver 2. The ON / OFF operation of the fifth drive IGBT 8e is controlled based on a fifth drive gate signal input from the drive gate signal generation unit 2b of the gate driver 2.

[0057] The sixth drive IGBT 8f has a collector terminal connected to the emitter terminal of the fifth drive IGBT 8e and the third motor terminal Fw, and an emitter terminal connected to the emitter terminal of the second drive IGBT 8b and the emitter terminal of the fourth drive IGBT 8d.

[0058] The gate terminal of the sixth drive IGBT 8f is connected to a sixth output terminal for the drive inverter D2 in the gate driver 2. The ON / OFF operation of the sixth drive IGBT 8f is controlled based on a sixth drive gate signal input from the drive gate signal generation unit 2b of the gate driver 2.

[0059] In such a driving inverter D2, both ends of the mutually commonly connected U-phase driving switching leg, V-phase driving switching leg, and W-phase driving switching leg are primary-side input / output terminals of the driving inverter D2. Also, the three midpoints of the U-phase driving switching leg, V-phase driving switching leg, and W-phase driving switching leg are secondary-side input / output terminals of the driving inverter D2.

[0060] That is, the connection point between the emitter terminal of the first drive IGBT 8a and the collector terminal of the second drive IGBT 8b, the connection point between the emitter terminal of the third drive IGBT 8c and the collector terminal of the fourth drive IGBT 8d, and the connection point between the emitter terminal of the fifth drive IGBT 8e and the collector terminal of the sixth drive IGBT 8f are the above-mentioned midpoints and are secondary side input / output terminals of the drive inverter D2.

[0061] In addition, one of the primary input / output terminals of the drive inverter D2, i.e., the collector terminal of the first drive IGBT 8a, the collector terminal of the third drive IGBT 8c, and the collector terminal of the fifth drive IGBT 8e, is connected to one of the secondary input / output terminals of the step-up / step-down converter D1, i.e., one end of the second capacitor 7, the collector terminal of the first transformer IGBT 6a, and the collector terminal of the third transformer IGBT 6c.

[0062] Furthermore, the other of the primary input / output terminals of the drive inverter D2, i.e., the emitter terminal of the second drive IGBT 8b, the emitter terminal of the fourth drive IGBT 8d, and the emitter terminal of the sixth drive IGBT 8f, are connected to the other of the secondary input / output terminals of the step-up / step-down converter D1, i.e., the other ends of the first and second capacitors 4 and 7, the emitter terminal of the second transformer IGBT 6b, and the emitter terminal of the fourth transformer IGBT 6d.

[0063] Next, the power generation inverter D3 will be described. The power generation inverter D3 is an inverter circuit that is provided between the step-up / step-down converter D1, which is a transformer circuit, and the generator J, and converts the generated power (AC power) input from the generator J into DC power and outputs it to the step-up / step-down converter D1 (transformer circuit).

[0064] Of the six power generating IGBTs 9a-9f that make up this power generating inverter D3, the first power generating IGBT 9a and the second power generating IGBT 9b are semiconductor switching elements that make up a U-phase power generating switching leg, the third power generating IGBT 9c and the fourth power generating IGBT 9d are semiconductor switching elements that make up a V-phase power generating switching leg, and the fifth power generating IGBT 9e and the sixth power generating IGBT 9f are semiconductor switching elements that make up a W-phase power generating switching leg.

[0065] Of the first power generation IGBT 9a and the second power generation IGBT 9b, the collector terminal of the first power generation IGBT 9a is connected to the collector terminal of the third power generation IGBT 9c and the collector terminal of the fifth power generation IGBT 9e, and the emitter terminal is connected to the collector terminal of the second power generation IGBT 9b and the first generator terminal Hu.

[0066] The gate terminal of the first power generation IGBT 9a is connected to a first output terminal for the power generation inverter D3 in the gate driver 2. The ON / OFF operation of the first power generation IGBT 9a is controlled based on a first power generation gate signal input from a power generation gate signal generating unit 2c of the gate driver 2.

[0067] The second power generating IGBT 9b has a collector terminal connected to the emitter terminal of the first power generating IGBT 9a and the first generator terminal Hu, and an emitter terminal connected to the emitter terminal of the fourth power generating IGBT 9d and the emitter terminal of the sixth power generating IGBT 9f. The gate terminal of this second power generating IGBT 9b is connected to the second output terminal for the power generating inverter D3 in the gate driver 2. The ON / OFF operation of this second power generating IGBT 9b is controlled based on a second power generating gate signal input from the power generating gate signal generating unit 2c of the gate driver 2.

[0068] The third power generating IGBT 9c has a collector terminal connected to the collector terminal of the first power generating IGBT 9a and the collector terminal of the fifth power generating IGBT 9e, and an emitter terminal connected to the collector terminal of the fourth power generating IGBT 9d and the second generator terminal Hv. The gate terminal of this third power generating IGBT 9c is connected to the third output terminal for the power generating inverter D3 in the gate driver 2. The ON / OFF operation of this third power generating IGBT 9c is controlled based on a third power generating gate signal input from the power generating gate signal generating unit 2c of the gate driver 2.

[0069] The fourth power generating IGBT 9d has a collector terminal connected to the emitter terminal of the third power generating IGBT 9c and the second power generator terminal Hv, and an emitter terminal connected to the emitter terminal of the second power generating IGBT 9b and the emitter terminal of the sixth power generating IGBT 9f. The gate terminal of this fourth power generating IGBT 9d is connected to the fourth output terminal for the power generating inverter D3 in the gate driver 2. The ON / OFF operation of this fourth power generating IGBT 9d is controlled based on a fourth power generating gate signal input from the power generating gate signal generating unit 2c of the gate driver 2.

[0070] The fifth power generating IGBT 9e has a collector terminal connected to the collector terminal of the first power generating IGBT 9a and the collector terminal of the third power generating IGBT 9c, and an emitter terminal connected to the collector terminal of the sixth power generating IGBT 9f and the third generator terminal Hw. The gate terminal of this fifth power generating IGBT 9e is connected to a fifth output terminal for the power generating inverter D3 in the gate driver 2. The ON / OFF operation of this fifth power generating IGBT 9e is controlled based on a fifth power generating gate signal input from the power generating gate signal generating unit 2c of the gate driver 2.

[0071] The sixth power generating IGBT 9f has a collector terminal connected to the emitter terminal of the fifth power generating IGBT 9e and the third power generator terminal Hw, and an emitter terminal connected to the emitter terminal of the second power generating IGBT 9b and the emitter terminal of the fourth power generating IGBT 9d. The gate terminal of this sixth power generating IGBT 9f is connected to a sixth output terminal for the power generating inverter D3 in the gate driver 2. The ON / OFF operation of this sixth power generating IGBT 9f is controlled based on a sixth power generating gate signal input from the power generating gate signal generating unit 2c of the gate driver 2.

[0072] In this power generation inverter D3, the three midpoints of the U-phase power generation switching leg, the V-phase power generation switching leg, and the W-phase power generation switching leg are primary-side input / output terminals of the power generation inverter D3. That is, the connection point between the emitter terminal of the first power generation IGBT 9a and the collector terminal of the second power generation IGBT 9b, the connection point between the emitter terminal of the third power generation IGBT 9c and the collector terminal of the fourth power generation IGBT 9d, and the connection point between the emitter terminal of the fifth power generation IGBT 9e and the collector terminal of the sixth power generation IGBT 9f are the midpoints and primary-side input / output terminals of the power generation inverter D3.

[0073] Of the three primary side input / output terminals of the power generation inverter D3, the midpoint (first primary side input / output terminal) of the U-phase power generation switching leg is connected to the first generator terminal Hu of the power conversion device A. Also, the midpoint (second primary side input / output terminal) of the V-phase power generation switching leg is connected to the second generator terminal Hv of the power conversion device A. Furthermore, the midpoint (third primary side input / output terminal) of the W-phase power generation switching leg is connected to the third generator terminal Hv of the power conversion device A.

[0074] In addition, both ends of the U-phase power generation switching leg, V-phase power generation switching leg, and W-phase power generation switching leg connected in parallel to each other in this power generation inverter D3 are secondary side input / output terminals of the power generation inverter D3. That is, the collector terminal of the first power generation IGBT 9a, the collector terminal of the third power generation IGBT 9c, the collector terminal of the fifth power generation IGBT 9e, the emitter terminal of the second power generation IGBT 9b, the emitter terminal of the fourth power generation IGBT 9d, and the emitter terminal of the sixth power generation IGBT 9f are the secondary side input / output terminals.

[0075] As shown in the figure, the secondary-side input / output terminals of the power generation inverter D3 are connected to the secondary-side input / output terminals of the step-up / step-down converter D1 and the primary-side input / output terminals of the drive inverter D2. That is, the power generation inverter D3 inputs and outputs DC power to and from the step-up / step-down converter D1.

[0076] Here, the transformer IGBTs 6a-6d of the step-up / step-down converter D1, the drive IGBTs 8a-8f of the drive inverter D2, and the power generating IGBTs 9a-9f of the power generating inverter D3 each have a free wheel diode. The cathode terminal of each IGBT is connected to the collector terminal, and the anode terminal is connected to the emitter terminal. Such a free wheel diode is used to pass a free wheel current from the anode terminal to the cathode terminal when the IGBT is in the OFF state.

[0077] Next, we will explain the gate driver 2. This gate driver 2 drives the step-up / step-down converter D1, the drive inverter D2, and the power generation inverter D3 based on a plurality of duty command values ​​(a duty manipulated variable for voltage transformation, a duty manipulated variable for drive, and a duty manipulated variable for power generation) input from the ECU 3.

[0078] That is, the voltage transformation gate signal generating unit 2a is a drive circuit for the voltage step-up / step-down converter D1, and is a drive signal generating circuit that generates first to fourth voltage transformation gate signals based on various voltage transformation operation amounts input from the ECU 3. For example, the voltage transformation gate signal generating unit 2a compares the voltage transformation duty operation amount with a carrier wave (triangular wave) having a period corresponding to the voltage transformation carrier frequency, thereby generating PWM (Pulse Width Modulation) signals having a repetition frequency (repetition period) and duty ratio according to the voltage transformation carrier frequency and the voltage transformation duty operation amount as the first to fourth voltage transformation gate signals.

[0079] The transformer gate signal generator 2a outputs a first transformer gate signal from a first output terminal for the buck-boost converter D1 to the gate terminal of the first transformer IGBT 6a. The transformer gate signal generator 2a outputs a second transformer gate signal from a second output terminal for the buck-boost converter D1 to the gate terminal of the second transformer IGBT 6b. The transformer gate signal generator 2a outputs a third transformer gate signal from a third output terminal for the buck-boost converter D1 to the gate terminal of the third transformer IGBT 6c. The transformer gate signal generator 2a outputs a fourth transformer gate signal from a fourth output terminal for the buck-boost converter D1 to the gate terminal of the fourth transformer IGBT 6d.

[0080] The drive gate signal generation unit 2b is a drive circuit for the drive inverter D2, and is a drive signal generation circuit that generates first to sixth drive gate signals based on the drive duty manipulated variable input from the ECU 3. For example, the drive gate signal generation unit 2b compares the drive duty manipulated variable with a carrier wave (triangular wave) having a cycle corresponding to the drive carrier frequency, thereby generating PWM signals having a repetition frequency (repetition period) and duty ratio according to the drive carrier frequency and the drive duty manipulated variable as the first to sixth drive gate signals.

[0081] The drive gate signal generation unit 2b outputs a first drive gate signal from a first output terminal for the drive inverter D2 to the gate terminal of the first drive IGBT 8a. The drive gate signal generation unit 2b outputs a second drive gate signal from a second output terminal for the drive inverter D2 to the gate terminal of the second drive IGBT 8b. The drive gate signal generation unit 2b outputs a third drive gate signal from a third output terminal for the drive inverter D2 to the gate terminal of the third drive IGBT 8c.

[0082] Furthermore, the drive gate signal generation unit 2b outputs a fourth drive gate signal from the fourth output terminal for the drive inverter D2 to the gate terminal of the fourth drive IGBT 8d. Further, the drive gate signal generation unit 2b outputs a fifth drive gate signal from the fifth output terminal for the drive inverter D2 to the gate terminal of the fifth drive IGBT 8e. Further, the drive gate signal generation unit 2b outputs a sixth drive gate signal from the sixth output terminal for the drive inverter D2 to the gate terminal of the sixth drive IGBT 8f.

[0083] The power generation gate signal generator 2c is a drive circuit for the power generation inverter D3, and is a drive signal generator circuit that generates first to sixth power generation gate signals based on the power generation duty manipulated variable input from the ECU 3. For example, the power generation gate signal generator 2c compares the power generation duty manipulated variable with a carrier wave (triangular wave) having a cycle corresponding to the power generation carrier frequency, thereby generating PWM signals having a repetition frequency (repetition period) and duty ratio according to the power generation carrier frequency and the power generation duty manipulated variable as the first to sixth power generation gate signals.

[0084] The power generation gate signal generator 2c outputs a first power generation gate signal from a first output terminal for the power generation inverter D3 to the gate terminal of the first power generation IGBT 9a. The power generation gate signal generator 2c outputs a second power generation gate signal from a second output terminal for the power generation inverter D3 to the gate terminal of the second power generation IGBT 9b. The power generation gate signal generator 2c outputs a third power generation gate signal from a third output terminal for the power generation inverter D3 to the gate terminal of the third power generation IGBT 9c.

[0085] Furthermore, the power generation gate signal generation unit 2c outputs a fourth power generation gate signal from the fourth output terminal for the power generation inverter D3 to the gate terminal of the fourth power generation IGBT 9d. Further, the power generation gate signal generation unit 2c outputs a fifth power generation gate signal from the fifth output terminal for the power generation inverter D3 to the gate terminal of the fifth power generation IGBT 9e. Further, the power generation gate signal generation unit 2c outputs a sixth power generation gate signal from the sixth output terminal for the power generation inverter D3 to the gate terminal of the sixth power generation IGBT 9f.

[0086] Here, the first to fourth transformer gate signals generated by the transformer gate signal generating unit 2a are drive signals provided with a well-known dead time to avoid through current in the A-phase transformer switching leg and B-phase switching leg of the step-up / step-down converter D1.

[0087] In addition, the first to sixth driving gate signals generated by the driving gate signal generating unit 2b are driving signals provided with a well-known dead time to avoid through current in the U-phase driving switching leg, the V-phase driving switching leg, and the W-phase driving switching leg.

[0088] Furthermore, the first to sixth power generation gate signals generated by the power generation gate signal generating unit 2c are drive signals provided with a well-known dead time to avoid through current in the U-phase power generation switching leg, the V-phase power generation switching leg, and the W-phase power generation switching leg.

[0089] The ECU3 is a control device that feedback controls the step-up / step-down converter D1, the drive inverter D2, and the power generation inverter D3 based on the detection values ​​(voltage detection values) of the various voltage sensors mentioned above, the detection values ​​(current detection values) of the various current sensors, control commands input from a higher-level control device (vehicle control device), and a pre-stored control program.

[0090] In other words, the ECU 3 is a software control device that feedback controls the step-up / step-down converter D1, drive inverter D2, and power generation inverter D3 in cooperation with a control program (software resource) and hardware resources such as an arithmetic circuit, a memory circuit, and various input / output circuits.

[0091] The ECU 3 has a plurality of functional components configured by the cooperation of software resources and hardware resources, namely, a transformation control unit for the buck-boost converter D1 that generates a transformation duty command value, a drive control unit for the drive inverter D2 that generates a drive duty command value, and a power generation control unit for the power generation inverter D3 that generates a power generation duty command value.

[0092] The ECU 3 generates first to fourth transformation gate signals by outputting the transformation duty command value generated by the transformation control unit to the transformation gate signal generation unit 2a of the gate driver 2. The ECU 3 also generates first to sixth driving gate signals by outputting the driving duty command value generated by the driving control unit to the driving gate signal generation unit 2b of the gate driver 2. The ECU 3 also generates first to sixth driving gate signals by outputting the power generation duty command value generated by the power generation control unit to the power generation gate signal generation unit 2c of the gate driver 2.

[0093] Next, a detailed configuration (control configuration) of the transformation control unit B in the ECU 3 will be described with reference to Fig. 2. This transformation control unit B is a characteristic functional component of the power conversion device A according to this embodiment, and constitutes a transformation control device together with the transformation gate signal generation unit 2a.

[0094] That is, the transformation control device according to this embodiment is configured with a transformation control unit B and a transformation gate signal generation unit 2a, and controls a step-up / step-down converter D1, which is a transformation circuit. Note that in the ECU 3, the drive control unit and power generation control unit other than the transformation control unit B are similar to well-known ones, and therefore a detailed description of their configuration (control configuration) will be omitted.

[0095] As shown in FIG. 2, this transformer control unit B includes a target value setting unit 10, a voltage control unit 11, a current control unit 12, a duty control unit 13, a first gain adjustment unit 14, a second gain adjustment unit 15, a first multiplier 16, a second multiplier 17, and a carrier frequency setting unit 18.

[0096] The target value setting unit 10 is a functional component that generates a secondary-side voltage command value X1 based on an externally input control command X0. This secondary-side voltage command value X1 is a target value (transformation target value) of the secondary voltage Vs of the buck-boost converter D1. In other words, the secondary-side voltage command value X1 is a value that specifies the transformation ratio h of the buck-boost converter D1, i.e., the ratio of the secondary voltage Vs to the primary voltage Vp.

[0097] The target value setting unit 10 outputs such secondary-side voltage command value X1 to the voltage control unit 11. The control command X0 is a control command input from a higher-level control device (vehicle control device). The primary voltage Vp is a detection value of a primary-side voltage sensor provided on the primary side (battery P side) of the buck-boost converter D1, and the secondary voltage Vs is a detection value of a secondary-side voltage sensor provided on the secondary side (drive inverter D2 side) of the buck-boost converter D1.

[0098] The voltage control unit 11 is a functional component that calculates a reactor current command value X2 based on the secondary-side voltage command value X1 and the secondary voltage Vs. This voltage control unit 11 is a well-known PI controller. More specifically, the voltage control unit 11 includes a proportional voltage control unit that generates a proportional reactor current command value and an integral voltage control unit that generates an integral reactor current command value. The proportional voltage control unit generates the proportional reactor current command value by multiplying the difference between the voltage command value X1 and the secondary voltage Vs by a proportional voltage gain.

[0099] The integral voltage control unit generates an integral reactor current command value by multiplying the difference between the voltage command value X1 and the secondary voltage Vs by an integral voltage gain and performing integration processing. The reactor current command value X2 is the sum of the proportional reactor current command value and the integral reactor current command value. The voltage control unit 11 outputs the reactor current command value X2 thus generated to the current control unit 12.

[0100] The current control unit 12 calculates the reactor current command value X2 and the reactor current I L It is a functional component that calculates the reactor voltage command value X3 based on the reactor current I L is the detection value of the reactor current sensor additionally provided in the step-up / step-down converter D1 as described above.

[0101] The current control unit 12 is a well-known PID controller, similar to the voltage control unit 11 described above. That is, the current control unit 12 includes a proportional current control unit that generates a proportional reactor voltage command value and an integral current control unit that generates an integral reactor voltage command value. The proportional current control unit calculates the current command value X2 and the reactor current I L The proportional reactor voltage command value is generated by multiplying the difference between the two by the proportional current gain.

[0102] The integral current control section also calculates the current command value X2 and the reactor current I L The difference between the proportional reactor voltage command value and the integral reactor voltage command value is multiplied by the integral current gain and integrated to generate an integral reactor voltage command value. The reactor voltage command value X3 is the sum of the proportional reactor voltage command value and the integral reactor voltage command value. The current control unit 12 outputs the reactor voltage command value X3 thus generated to the duty control unit 13.

[0103] The duty control unit 13 is a functional component that calculates an A-phase duty command value X4 for the A-phase transformer switching leg and a B-phase duty command value X5 for the B-phase transformer switching leg based on the reactor voltage command value X3. The duty control unit 13 outputs the A-phase duty command value X4 and the B-phase duty command value X5 to the transformation gate signal generation unit 2a of the gate driver 2.

[0104] Here, as described above, the buck-boost converter D1 includes an A-phase transformer switching leg and a B-phase switching leg, which are controlled by first and second transformer gate signals and third and fourth transformer gate signals that are 180° out of phase with each other.

[0105] In order to accommodate such a two-phase configuration of the buck-boost converter D1, the duty control unit 13 generates an A-phase duty command value X4 and a B-phase duty command value X5. That is, the A-phase duty command value X4 is a manipulated variable that specifies the duty ratios of the first and second transformation gate signals that control the A-phase transformation switching leg. Also, the B-phase duty command value X5 is a manipulated variable that specifies the duty ratios of the third and fourth transformation gate signals that control the B-phase transformation switching leg.

[0106] The first gain adjustment unit 14 adjusts the reactor current I L The first to fourth gain instruction signals X6 to X9 are instruction signals that instruct the respective control gains of the voltage control unit 11 and the current control unit 12. The first gain adjustment unit 14 outputs the first gain instruction signal X6 to the first multiplier 16, outputs the second gain instruction signal X7 to the voltage control unit 11, outputs the third gain instruction signal X8 to the second multiplier 17, and outputs the fourth gain instruction signal X9 to the current control unit 12.

[0107] The first gain adjustment unit 14 adjusts the reactor current I L In a small current operating region R where is smaller than a predetermined current threshold, a first gain instruction signal X6 and a fourth gain instruction signal X9 are generated so as to increase the proportional voltage gain of the voltage control unit 11 and the integral current gain of the current control unit 12 to be greater than the gains (normal gains) in the normal region Q.

[0108] The first gain adjustment unit 14 adjusts the integral voltage gain of the voltage control unit 11 and the proportional current gain of the current control unit 12 in accordance with the reactor current I L The second gain instruction signal X7 and the third gain instruction signal X8 are generated so as to maintain the normal gain regardless of the magnitude of the gain.

[0109] That is, the first gain instruction signal X6 is a signal that indicates "1" as a coefficient in the normal region Q, and indicates a coefficient greater than "1" (proportional voltage adjustment coefficient K VP) in the normal region Q, and in the small current operating region R, the fourth gain instruction signal X9 is a signal that indicates a coefficient of "1" (integral current adjustment coefficient K ID Furthermore, the second gain instruction signal X7 and the third gain instruction signal X8 are signals that indicate "1" as a coefficient in both the normal region Q and the small current operation region R.

[0110] The small current operating region R is an operating region of the traveling motor M or the generator J in which a relatively small drive current or a relatively small generated current flows through the traveling motor M or the generator J. In such a small current operating region R, the reactor current I L Due to fluctuations in the torque, the traction motor M or the generator J is likely to vibrate.

[0111] Specifically, the first gain adjustment unit 14 variably sets the proportional voltage gain of the voltage control unit 11 and the proportional current gain of the current control unit 12 as shown in Fig. 3. In Fig. 3, (a) shows the reactor current I L The proportional voltage gain G of the voltage control unit 11 based on VP (b) shows the change in reactor current I L The integral voltage gain G of the voltage control unit 11 based on VD In addition, in Fig. 3, (c) shows the change in reactor current I L The proportional current gain G of the current control section 12 based on IP (d) shows the change in reactor current I L The integral current gain G of the current control section 12 based on ID This shows the change in

[0112] That is, the first gain adjustment unit 14 adjusts the proportional voltage gain G VP The proportional voltage gain G in the normal region Q VP Furthermore, a gain transition region T is set between the small current operation region R and the normal region Q. In this gain transition region T, the first gain adjustment unit 14 adjusts the proportional voltage gain G VPis changed gradually rather than stepwise.

[0113] Furthermore, the first gain adjustment unit 14 adjusts the integral voltage gain G VD is set to a constant value in the small current operation region R, the gain transition region T, and the normal region Q. Also, as shown in FIG. 3(c), the first gain adjuster 14 adjusts the proportional current gain G IP is also set to a constant value in the small current operation region R, the gain transition region T, and the normal region Q.

[0114] Furthermore, the first gain adjuster 14 adjusts the integral current gain G ID The integral current gain G in the normal region Q ID In the gain transition region T, the first gain adjuster 14 adjusts the integral current gain G ID is changed gradually rather than stepwise.

[0115] The second gain adjustment unit 15 is a functional component that generates fifth and sixth gain instruction signals X10 and X11 based on the motor rotation speed Ntrc of the travel motor M, the generator rotation speed Ngen of the generator J, the primary voltage Vp of the primary voltage sensor, and the secondary voltage Vs of the secondary voltage sensor. The fifth gain instruction signal X10 is used to adjust the proportional voltage gain G VP The sixth gain instruction signal X11 is an instruction signal for instructing the proportional current gain G IP The second gain adjuster 15 outputs the fifth gain instruction signal X10 to the first multiplier 16, and outputs the sixth gain instruction signal X11 to the second multiplier 17.

[0116] As shown in FIG. 4(a), the second gain adjustment unit 15 adjusts the proportional voltage gain G VP 4(b), the second gain adjustment unit 15 generates a fifth gain instruction signal X10 so that the motor rotation speed Ntrc or the electric machine rotation speed Ngen maintains the normal gain.R The proportional current gain G of the current control section 12 in IP at a specific rotation speed N R The sixth gain instruction signal X11 is generated so as to increase the gain at frequencies other than the above (normal gain).

[0117] That is, the sixth gain instruction signal X11 is R In this case, the coefficient (proportional current adjustment coefficient K IP ) and a specific rotation speed N R The fifth gain instruction signal X10 indicates a coefficient of "1" at the specific rotation speed N R The proportional voltage gain G of the voltage control section 11 in VP is not adjusted according to the motor rotation speed Ntrc or the electric machine rotation speed Ngen, but is a signal that always indicates "1" as a coefficient regardless of the motor rotation speed Ntrc or the electric machine rotation speed Ngen.

[0118] Here, as shown in the figure, the primary voltage Vp and the secondary voltage Vs are input to the second gain adjustment unit 15. The second gain adjustment unit 15 obtains the transformation ratio h of the step-up / step-down converter D1 based on the primary voltage Vp and the secondary voltage Vs, and determines the specific rotation speed N R Proportional current adjustment coefficient K IP Adjust.

[0119] The first multiplier 16 is a functional component that multiplies the first gain instruction signal X6 by the fifth gain instruction signal X10. The first multiplier 16 outputs a seventh gain instruction signal X12, which is the multiplication result of the first gain instruction signal X6 by the fifth gain instruction signal X10, to the voltage control unit 11. That is, the proportional voltage gain indicated by the seventh gain instruction signal X12 is the product of the proportional voltage gain indicated by the first gain instruction signal X6 and the proportional voltage gain indicated by the fifth gain instruction signal X10.

[0120] The second multiplier 17 is a functional component that multiplies the third gain instruction signal X8 by the sixth gain instruction signal X11. The second multiplier 17 outputs an eighth gain instruction signal X13, which is the multiplication result of the third gain instruction signal X8 by the sixth gain instruction signal X11, to the current control unit 12. That is, the proportional current gain indicated by the eighth gain instruction signal X13 is the product of the proportional current gain indicated by the third gain instruction signal X8 and the proportional current gain indicated by the sixth gain instruction signal X11.

[0121] The carrier frequency setting unit 18 sets the primary voltage Vp, the secondary voltage Vs, and the reactor current I L The carrier frequency setting unit 18 outputs a frequency specification signal X16 indicating the carrier frequency fc to the transformation gate signal generating unit 2a of the gate driver 2. The carrier frequency fc is the repetition frequency of a triangular wave signal used by the transformation gate signal generating unit 2a when generating the first to fourth transformation gate signals.

[0122] Next, the operation of the main parts of the power conversion device A according to this embodiment, that is, the control operation of the transformation control unit B, will be described with reference to the flowchart of FIG.

[0123] In the transformer control unit B, first, the carrier frequency setting unit 18 acquires the primary voltage Vp, the secondary voltage Vs, and the reactor current IL to generate a frequency specification signal X16 (step S1). The carrier frequency setting unit 18 sets the carrier frequency fc by searching a carrier map (control map) using the primary voltage Vp, the secondary voltage Vs, and the reactor current IL, and outputs the frequency specification signal X16 indicating the carrier frequency fc to the transformer gate signal generation unit 2a of the gate driver 2.

[0124] Meanwhile, in the transformer control unit B, the target value setting unit 10 receives a control command X0 from the outside and sets a secondary-side voltage command value X1 (step S2). This secondary-side voltage command value X1 is output from the target value setting unit 10 to the voltage control unit 11.

[0125] In the transformer control unit B, the first gain adjustment unit 14 adjusts the reactor current I L The first to fourth gain instruction signals X6 to X9 are generated by taking in the first to fourth gain instruction signals X6 to X9 (step S3). Then, the first gain instruction signal X6 is output from the first gain adjustment unit 14 to the first multiplier 16, the second gain instruction signal X7 is output from the first gain adjustment unit 14 to the voltage control unit 11, the third gain instruction signal X8 is output from the first gain adjustment unit 14 to the second multiplier 17, and the fourth gain instruction signal X9 is output from the first gain adjustment unit 14 to the current control unit 12.

[0126] In the transformer control unit B, the second gain adjustment unit 15 takes in the motor rotation speed Ntrc, the generator rotation speed Ngen, the primary voltage Vp, and the secondary voltage Vs to generate fifth and sixth gain instruction signals X10, X11 (step S4). The fifth gain instruction signal X10 is output from the second gain adjustment unit 15 to the first multiplier 16, and the sixth gain instruction signal X11 is output from the second gain adjustment unit 15 to the second multiplier 17.

[0127] In the transformer control unit B, the first multiplier 16 receives the first gain instruction signal X6 and the fifth gain instruction signal X10 to generate a seventh gain instruction signal X12, and the second multiplier 17 receives the second gain instruction signal X6 and the sixth gain instruction signal X11 to generate an eighth gain instruction signal X13 (step S5). The seventh gain instruction signal X12 is output from the first multiplier 16 to the voltage control unit 11, and the eighth gain instruction signal X13 is output from the second multiplier 17 to the current control unit 12.

[0128] In the transformer control unit B, the voltage control unit 11 receives the secondary-side voltage command value X1, the secondary-side voltage Vs, the second gain instruction signal X7, and the seventh gain instruction signal X12 to set a reactor current command value X2 (step S6). The reactor current command value X2 is then output from the voltage control unit 11 to the current control unit 12.

[0129] In the transformer control unit B, the current control unit 12 calculates the reactor current command value X2 and the reactor current I LThe current control unit 12 then receives the fourth gain instruction signal X9 and the eighth gain instruction signal X13 to set a duty command value X3 (step S7). The duty command value X3 is then output from the current control unit 12 to the duty control unit 13.

[0130] In the transformation control unit B, the duty control unit 13 takes in the duty command value X3 to generate an A-phase duty control input X4 and a B-phase duty control input X5 (step S8). The B-phase duty control input X5 and the B-phase duty control input X5 are then output from the duty control unit 13 to the transformation gate signal generation unit 2a of the gate driver 2.

[0131] Then, the transformer gate signal generator 2a generates first to fourth transformer gate signals (step S9) by receiving the A-phase duty cycle manipulated variable X4, the B-phase duty cycle manipulated variable X5, and the frequency designation signal X16 from the transformer control unit B. Then, the first to fourth transformer gate signals are output from the transformer gate signal generator 2a to the buck-boost converter D1, causing the buck-boost converter D1 to perform a desired buck-boost operation.

[0132] According to this embodiment, the reactor current I L In the small current operation region R where the reactor current I is smaller than a predetermined current threshold, the proportional voltage gain of the voltage control unit 11 is increased to be greater than the gain (normal gain) in the normal region Q. L Since the current ripple is suppressed, it is possible to suppress vibrations of the traveling motor M or the generator J. Therefore, according to this embodiment, it is possible to provide a transformer control device and a transformer device that can suppress vibrations of the traveling motor M or the generator J.

[0133] Furthermore, according to this embodiment, the first gain adjustment unit 14 increases the integral current gain of the current control unit 12 to be greater than the gain (normal gain) in the normal region Q in the small current operating region R where the reactor current IL is smaller than a predetermined current threshold. According to this embodiment, it is possible to suppress a jump in the secondary voltage Vs caused by the dead time of the first to fourth transformer gate signals. Therefore, according to this embodiment, it is possible to provide a transformation control device that can suppress vibrations of the traction motor M or the generator J.

[0134] Furthermore, according to this embodiment, the second gain adjustment unit 15 adjusts the motor rotation speed Ntrc or the electric machine rotation speed Ngen to the specific rotation speed N R In this case, the proportional voltage gain G VP is increased more than that of the first gain adjustment unit 14, and the proportional current gain G IP is increased more than the normal gain. R It is possible to suppress vibrations of the traction motor M or generator J in the vehicle.

[0135] The present invention is not limited to the above-described embodiment, and the following modifications are possible. (1) In the above embodiment, the step-up / step-down converter D1, i.e., the magnetically coupled interleaved chopper circuit having a two-phase configuration of phases A and B, has been described, but the present invention is not limited to this. In other words, the present invention can also be applied to a magnetically coupled interleaved chopper circuit having a three-phase or more configuration.

[0136] (2) In the above embodiment, the first gain adjustment unit 14 and the second gain adjustment unit 15 are provided, but the second gain adjustment unit 15 may be omitted if necessary. That is, the proportional voltage gain G VP and the integral current gain G of the current control section 12 ID may be simply increased to be greater than the gain in the normal region Q (normal gain).

[0137] (3) In the above embodiment, the first multiplier 16 is provided in addition to the second multiplier 17, so that the specific rotation speed N R The proportional current gain G IP In addition to increasing the gain at other frequencies, the proportional voltage gain G VP can be increased more than the gain at other frequencies, but the proportional current gain G IP However, the proportional voltage gain G VP The fifth gain instruction signal X10 may be generated so as to increase the gain of the frequency band X10 more than that of the other frequencies.

[0138] (4) In the above embodiment, the power conversion circuit 1 uses IGBTs as the semiconductor switching elements, but the present invention is not limited to this. For example, MOSFETs may be used as the semiconductor switching elements. [Explanation of symbols]

[0139] A Power conversion device B Transformer control section D1 Buck-boost converter (transformer circuit, magnetically coupled interleaved chopper circuit) D2 Drive inverter D3 Power generation inverter E1, E2 Battery terminal Fu, Fv, Fw motor terminals J Generator (rotating electric machine) Hu, Hv, Hw generator terminals P battery M Travel motor (rotating electric machine) 1 Power conversion circuit 2 Gate drivers 2a Transformer gate signal generator (drive signal generator circuit) 2b Drive gate signal generator 2c Power generation gate signal generator 3 ECU(Electronic Control Unit) 4. First Capacitor 5. Transformer 5a primary winding 5b Secondary winding 6a~6d Transformer IGBTs 7 Second Capacitor 8a~8f drive IGBT 9a~9f Power generation IGBT 10 Target value setting section 11 Voltage control section 12 Current control section 13 Duty control section

Claims

1. A transformer control device comprising at least a voltage control unit that generates a current command value, which is a target value of a current to be supplied to a rotating electric machine, based on a transformation target value of a transformer circuit connected to the rotating electric machine and a state quantity of the rotating electric machine, and a current control unit that generates a voltage command value, which is a target value of a voltage to be applied to the rotating electric machine, based on the current command value, and outputs an operation amount generated based on the voltage command value to a drive signal generation circuit to feedback control the transformer circuit, a first gain adjustment unit that increases a proportional voltage gain for generating the current command value in the voltage control unit to be greater than a normal gain in a small current operation region where the reactor current of the transformer circuit is smaller than a predetermined current threshold; a second gain adjustment unit that increases a proportional current gain for generating the voltage command value in the current control unit to be greater than a normal gain when the rotation speed of the rotary electric machine is a specific rotation speed; A transformer control device comprising:

2. When the drive signal generating circuit generates a drive signal having a dead time, 2. The transformer control device according to claim 1, wherein the first gain adjustment unit increases the integral current gain of the current control unit in the small current operating region to a value greater than a normal gain.

3. 3. The transformer control device according to claim 1, wherein the transformer circuit is a magnetically coupled multi-phase converter.

4. A voltage transformer control device according to any one of claims 1 to 3; the transformer circuit controlled by the transformer control device; a drive inverter provided between the transformer circuit and a motor, which converts DC power input from the transformer circuit into AC power and outputs the AC power to the motor; a power generating inverter provided between the transformer circuit and the generator, which converts AC power input from the generator into DC power and outputs the DC power to the transformer circuit; A power conversion device comprising:

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