JP2017017765A - Charger in motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost charger in a motor drive device that can realize a longer lifetime of an inverter and can be made compact so as to be mounted in a vehicle, while down-sizing the whole device by sharing the circuit for use in the device, and incorporating the functional section of an inverter and the charger in the motor housing.SOLUTION: When charging a power storage device 400 from an AC power supply 30, a controller controls bidirectional DC-DC converter and a motor inverter so that the power of the AC power supply is supplied to the power storage device via the AC I/O terminals 111a, b of an AC/DC converter 100, a DC rectifier section 120, a DC output terminal 121a, the DC input terminal 201a of a motor inverter 200, coils 11, 12, 13 of the motor 10, the DC I/O terminal 202a of the motor inverter 200, and first DC I/O output terminal 301a, and second DC I/O output terminal 302a of a bidirectional DC-DC converter 300.SELECTED DRAWING: Figure 2

Description

The present invention relates to a charging device in a motor driving device, and more particularly to a charging device in a motor driving device that can reduce the number of parts for the charging device and reduce the size.

  In an electric vehicle, a hybrid vehicle, and the like, electric power is supplied from a battery (storage battery) to a traveling motor via a bidirectional DC-DC converter and a motor inverter. When the voltage of the battery and the voltage supplied to the motor are different, the voltage is boosted or lowered by the bidirectional DC-DC converter. On the other hand, it is necessary to charge the battery using an AC power source. Also in this case, when the voltage of the AC power supply and the voltage of the battery are different, it is necessary to provide an AC / DC converter as a rectifying unit and a DC-DC converter for step-up or step-down between the AC power supply and the battery. is there.

Patent Document 1 below relates to an electric vehicle and uses a three-phase bridge circuit of an inverter that drives a motor to convert DC power stored in an in-vehicle battery into AC power, and supplies the converted AC power to the motor. The AC power from the external AC power source is transformed through a step-up or step-down circuit having a magnetically coupled primary coil and secondary coil, and then sent to a three-phase bridge circuit. An invention is described in which a direct current is rectified by a phase bridge circuit and then supplied to an in-vehicle battery to charge the in-vehicle battery.

JP 2014-176164 A

  However, a charging device mounted on a conventional electric vehicle or the like needs to provide an AC / DC converter as a rectifying unit and a DC-DC converter for step-up or step-down between an AC power source and a battery, It was necessary to separately provide a coil and a step-up or step-down circuit for stepping up or down the voltage of the AC power source to the voltage of the in-vehicle battery.

  For this reason, the number of parts in the functional part as a charging device increases, and the installation space for it increases, making it difficult to reduce the size and reduce the cost for in-vehicle use.

  SUMMARY OF THE INVENTION Accordingly, it is a first object of the present invention to provide a charging device in a motor drive device that can be miniaturized for in-vehicle use and that is low cost.

In addition, the conventional motor is driven by an inverter composed of a bidirectional DC-DC converter and a motor inverter. However, the conventional inverter is installed separately from the motor housing. For this reason, the cable which connects a motor and an inverter became long and the inductance component became large. As a result, a surge is generated when the IGBT serving as a switching element for controlling high power is turned on / off, and thus it is necessary to remove the surge with a capacitor and a resistor. Since the surge is large, an electrolytic capacitor is used as the capacitor, but this electrolytic capacitor has a life of about 10 years and has a low life as an inverter. Furthermore, the charging device is separate from the inverter, and it has been difficult to reduce the size of the entire device due to the influence of noise and the like that cannot be shared by the circuit or during charging.
Therefore, the present invention aims to share the circuit used in the device, and to reduce the size of the entire device by incorporating the functional part of the inverter and the charging device in the motor housing, and the inverter used in the motor drive device It is a second problem to be solved to extend the service life.

To that end, the first invention is a charging device in a motor drive device including an AC / DC converter, a motor inverter, a motor including a coil, a bidirectional DC-DC converter, a power storage device, and a control device. And
The AC / DC converter includes an AC input / output terminal electrically connected to an AC power source, a DC rectification unit electrically connected to the AC input / output terminal, and a DC current rectified by the DC rectification unit. DC output terminal to be output,
The motor inverter includes a DC input terminal electrically connected to a DC output terminal of the AC / DC converter, and a DC input electrically connected to a first DC input / output terminal of the bidirectional DC-DC converter. An output terminal and an AC input / output terminal electrically connected to the motor;
The bidirectional DC-DC converter includes a first DC input / output terminal electrically connected to a DC input / output terminal of the motor inverter, and a second DC input / output terminal electrically connected to the power storage device. And
When driving the motor with the power of the power storage device,
In the control device, the power stored in the power storage device is changed from the second DC input / output terminal of the bidirectional DC-DC converter to the first DC input / output terminal, and the DC input / output terminal of the motor inverter. , Controlling the bidirectional DC-DC converter and the motor inverter to be supplied to the motor via the AC input / output terminal,
When charging the power storage device with power supplied from the AC power supply,
In the control device, the power supplied from the AC power source includes the AC input / output terminal of the AC / DC converter, the DC rectification unit, the DC output terminal, the DC input terminal of the motor inverter, and a coil of the motor. , The DC input / output terminal of the motor inverter, the first DC input / output terminal of the bidirectional DC-DC converter, and the second DC input / output terminal to be supplied to the power storage device. A directional DC-DC converter and the motor inverter are controlled.

In a second aspect based on the first aspect, the bidirectional DC-DC converter and the motor inverter each include a switching element formed of an FET, and a switching signal output from the control device is input to the switching element. It is characterized by this.

A third invention is characterized in that, in the first invention or the second invention, the bidirectional DC-DC converter and the motor inverter are provided in a housing of the motor.

According to a fourth invention, in any one of the first to third inventions, when the power storage device is charged with electric power generated by regeneration of the motor,
In the control device, the electric power generated by the regeneration of the motor receives the AC input / output terminal of the motor inverter, the DC input / output terminal, the first DC input / output terminal of the bidirectional DC-DC converter, the first The bidirectional DC-DC converter and the motor inverter are controlled so as to be supplied to the power storage device via two DC input / output terminals.

  When charging the power storage device (battery) using an AC power supply, if the voltage of the AC power supply and the voltage of the power storage device are different, a charging device including a coil for boosting or stepping down and a boosting circuit is required. According to the present invention, both the existing electric power stored in the power storage device are provided for boosting or stepping down the voltage and converting it into alternating current power to supply the motor to the motor for power running operation (motor operation). The direct current DC-DC converter, the motor inverter, and the motor coil also serve as a step-up or step-down function of the charging device. For this reason, it is not necessary to separately provide a dedicated charging device, the number of components in the functional part as the charging device is reduced, and the installation space for that can be reduced, and it is easy to reduce the size and cost for in-vehicle use. . Thereby, it becomes possible to provide the market with a charging device in a small and low-cost motor driving device for in-vehicle use.

  According to the second aspect of the invention, since the switching elements of the bidirectional DC-DC converter and the motor inverter are composed of FETs, there is no rectifier diode and there is little loss. Further, high efficiency can be achieved by switching at a high frequency. In addition, a reduction in the number of parts and low heat generation can be realized, which enables downsizing.

  According to the third invention, since the bidirectional DC-DC converter and the motor inverter are provided in the motor housing, the installation space for the vehicle can be reduced. That is, the circuit used in the device is shared, and the functional portions of the inverter and the charging device are built in the motor housing, whereby the overall size of the device can be reduced. Furthermore, the cable connecting the motor and the motor inverter can be made as short as possible, and the inductance component can be kept low. This makes it possible to replace the electrolytic capacitor for surge countermeasures with a film capacitor. Since a film capacitor has a longer life than an electrolytic capacitor, it is possible to extend the life of an inverter used in a motor drive device.

    According to the fourth invention, the power storage device can be charged with the electric power generated by the regeneration of the motor.

FIG. 1 is a block diagram illustrating the overall configuration of the charging device in the motor drive device according to the embodiment. FIG. 2 is a diagram illustrating a circuit configuration example of the motor driving device. FIG. 3 is a diagram illustrating an operation performed in the DC rectification unit of the AC / DC converter during charging. 4A and 4B are graphs showing an AC voltage waveform between AC input / output terminals of the AC / DC converter and a DC voltage waveform between DC output terminals, respectively. FIG. 5 is a diagram illustrating an operation performed in the three-phase bridge circuit of the motor inverter during charging. FIGS. 6A and 6B are diagrams for explaining operations performed by the bidirectional DC-DC converter during charging. FIG. 7 is a diagram illustrating an operation performed by the three-phase bridge circuit of the motor inverter during power running. FIG. 8 is a control map diagram showing the relationship between the switching signal applied to the gate of each semiconductor switching element of the motor inverter and the rotation angle of the motor during power running. FIG. 9 is a diagram illustrating an operation performed in the three-phase bridge circuit of the motor inverter during regeneration. FIG. 10 is a control map diagram showing the relationship between the switching signal applied to the gate of each semiconductor switching element of the motor inverter during regeneration and the rotation angle of the motor.

Embodiments of a charging device in a motor drive device according to the present invention will be described below.

FIG. 1 is a block diagram showing the overall configuration of the charging device in the motor drive device of the embodiment.

  As shown in FIG. 1, the motor drive device 1 of the embodiment includes an AC / DC converter 100, a motor inverter 200, a motor 10, a bidirectional DC-DC converter 300, a power storage device 400, and a control device 500. It consists of and. The motor inverter 200 and the bidirectional DC-DC converter 300 constitute the inverter 20.

An AC power supply 30 is electrically connected to the AC / DC converter 100 from the outside. AC power supply 30 is, for example, a commercial power supply of 100V to 200V. The motor 10 is a three-phase AC motor, for example, and has three coils and is connected to each other. The motor drive device 1 is mounted on, for example, an electric vehicle.

Power storage device 400 is, for example, a lithium ion battery. Note that the power storage device 400 of the present invention is not limited as long as it is chargeable / dischargeable and can store power of a predetermined capacity, and includes a capacitor (capacitor) such as a lithium ion capacitor as well as a battery such as a nickel hydride or lead storage battery. It is. The voltage between terminals of power storage device 400 is, for example, 300V.

The inverter 20 including at least the bidirectional DC-DC converter 300 and the motor inverter 200 is provided in the housing 19 of the motor 10. Note that the AC / DC converter 100 and the control device 500 may also be provided in the motor 10 housing 19.

The control device 500 outputs control signals to the AC / DC converter 100, the motor inverter 200, and the bidirectional DC-DC converter 300, and the AC / DC converter 100, the motor inverter 200, and the bidirectional DC-DC converter 300 are output. Control.

FIG. 2 is a diagram illustrating a circuit configuration example of the motor driving device 1.

  The AC / DC converter 100 includes a filter unit 110 and a DC rectification unit 120.

The AC / DC converter 100 includes AC input / output terminals 111a and 111b that are electrically connected to the AC power supply 30, a DC rectifier 120 that is electrically connected to the AC input / output terminals 111a and 111b, and a DC rectifier 120. DC output terminals 121a and 121b from which a direct current rectified by the output is output.

The filter unit 110 is a filter that smoothes alternating current and supplies alternating current power to the direct current rectifying unit 120, and includes a filter capacitor 112 that is electrically connected between the alternating current input / output terminals 111a and 111b, and a filter A choke coil 113 electrically connected to both end terminals 112a and 112b of the capacitor 112 is provided, and the AC input / output terminals 122a and 122b of the DC rectifying unit 120 are electrically connected to the respective end portions 113a and 113b of the choke coil 113. Has been.

The DC rectification unit 120 rectifies the AC current input / output from the AC input / output terminals 122a and 122b into a DC current, and outputs the rectified DC current from the DC output terminals 121a and 121b (plus side terminal 121a). It is a rectification unit, and a full-wave rectification circuit is configured by the bridge circuit 123. The bridge circuit 123 of the DC rectifying unit 120 includes four semiconductor switching elements Q1 (upper left arm), Q2 (lower left arm), Q3 (upper right arm), and Q4 (lower right arm) formed of FETs.

The semiconductor switching elements Q1, Q2, Q3, and Q4 are driven and controlled by applying an on / off switching signal as a control signal output from the control device 500 to each gate, and each valve opens and closes. The valve is electrically connected and cut off.

The motor inverter 200 includes DC input terminals 201a and 201b (plus side terminal 201a) electrically connected to DC output terminals 121a and 121b (plus side terminal 121a) of the AC / DC converter 100, and a bidirectional DC-DC converter. 300 DC first input / output terminals 301a, 301b (plus side terminal 301a) and DC input / output terminals 202a, 202b (plus side terminal 202a) electrically connected to the first DC input / output terminals 301a, 301b (plus side terminal 301a). AC input / output terminals 203a, 203b, 203c electrically connected to (u phase, v phase, w phase).

The motor inverter 200 is composed of a three-phase bridge circuit 210. The three-phase bridge circuit 210 of the motor inverter 200 includes six semiconductor switching elements Q5 (upper left arm), Q6 (lower left arm), Q7 (middle upper arm), Q8 (middle lower arm), Q9 ( Upper right arm), Q10 (lower right arm).

The semiconductor switching elements Q5, Q6, Q7, Q8, Q9, and Q10 are driven and controlled by applying ON / OFF switching signals as control signals output from the control device 500 to the respective gates. The valve opens and closes, and the valve is electrically connected and disconnected.

The bidirectional DC-DC converter 300 is configured to be capable of supplying power to each other via a transformer, for example. Bidirectional DC-DC converter 300 is provided to insulate power storage device 400 from AC power supply 30.

The bidirectional DC-DC converter 300 includes a transformer 310 including a first winding 311 and a second winding 312, a DC / AC converter 320, and an AC / DC converter 330.

Bidirectional DC-DC converter 300 includes first DC input / output terminals 301a and 301b (plus side terminal 301a) electrically connected to DC input / output terminals 202a and 202b (plus side terminal 202a) of motor inverter 200. The second DC input / output terminals 302a and 302b (plus side terminals 302a) electrically connected to the power storage device 400 are provided.

  Both end terminals 401a and 401b (plus side terminal 401a) of the power storage device 400 are respectively connected to the DC terminals 321a and 321b (of the DC / AC converter 320 via the second DC input / output terminals 302a and 302b (plus side terminal 302a)). The positive terminal 321a) is electrically connected. A smoothing capacitor 325 is electrically connected between the DC terminals 321a and 321b.

The AC input / output terminals 322 a and 322 b of the DC / AC converter 320 are electrically connected to both ends of the first winding 311, respectively.

The DC / AC converter 320 includes a bridge circuit 323. The bridge circuit 323 of the DC / AC converter 320 includes four semiconductor switching elements Q15 (upper left arm), Q16 (lower left arm), Q17 (upper right arm), and Q18 (lower right arm) formed of FETs. .

The semiconductor switching elements Q15, Q16, Q17, and Q18 are driven and controlled by applying an on / off switching signal as a control signal output from the control device 500 to each gate, so that each valve opens and closes. The valve is electrically connected and cut off.

  Both ends of the second winding 312 are electrically connected to AC terminals 331a and 331b of the AC / DC converter 330, respectively.

  The DC terminals 332a and 332b (plus side terminal 332a) of the AC / DC converter 330 are respectively connected to the DC input / output terminals 202a and 202a of the motor inverter 200 via the first DC input / output terminals 301a and 301b (plus side terminal 301a). 202b (plus side terminal 202a) is electrically connected. A smoothing capacitor 335 is electrically connected between the DC terminals 332a and 332b.

The AC / DC converter 330 includes a bridge circuit 333. The bridge circuit 333 of the AC / DC converter 330 includes four semiconductor switching elements Q11 (upper left arm), Q12 (lower left arm), Q13 (upper right arm), and Q14 (lower right arm) formed of FETs. .

The semiconductor switching elements Q11, Q12, Q13, and Q14 are driven and controlled by applying an on / off switching signal as a control signal output from the control device 500 to each gate, so that each valve opens and closes. The valve is electrically connected and cut off.

  Therefore, when the DC voltage of the power storage device 400 is applied between the second DC input / output terminals 302a and 302b of the bidirectional DC-DC converter 300, the DC / AC converter 320 converts the DC voltage of the power storage device 400 into an AC voltage. The converted alternating voltage is transmitted to the AC / DC converter 330 via the transformer 310. The voltage is stepped up or down according to the turn ratio of the first winding 311 and the second winding 312. For example, if the ratio n1: n2 between the number of turns n1 of the first winding 311 and the number of turns n2 of the second winding 312 is 2: 1, the voltage is stepped down by a factor of 1/2. In the AC / DC converter 330, the transmitted AC voltage is rectified and converted into a DC voltage, and applied between the first DC input / output terminals 301a and 301b.

  In the present embodiment, the power stored in the power storage device 400 is boosted or stepped down, converted into AC power, supplied to the motor 10, and provided for the motor 10 to perform a power running operation (electric motor action). The bidirectional DC-DC converter 300, the motor inverter 200, and the coils 11, 12, and 13 of the motor 10 also serve as a step-up or step-down function of the charging device. Hereinafter, the operation performed in the motor drive device 1 of the present embodiment will be described.

(When charging)
FIG. 3 is a diagram for explaining an operation performed by DC rectification unit 120 of AC / DC converter 100 during charging. An arrow C <b> 1 indicates a DC current (flowing direction) output after being rectified by the DC rectifying unit 120.
4A and 4B show an AC voltage waveform between the AC input / output terminals 111a and 111b and a DC voltage waveform between the DC output terminals 121a and 121b (plus side terminal 121a), respectively.
When the AC power supply 30 is electrically connected to the AC input / output terminals 111a and 111b, the control device 500 causes the AC voltage between the AC input / output terminals 111a and 111b to be a positive period T1 (FIG. 4A). ) Outputs a switching signal for turning on the gate voltages of the semiconductor switching elements Q1 (upper left arm) and Q4 (lower right arm) and turning off the gate voltages of the semiconductor switching elements Q2 (lower left arm) and Q3 (upper right arm). To do. Then, the control device 500 controls the semiconductor switching elements Q2 (lower left arm, Q3 (upper right arm)) in the period T2 (FIG. 4A) in which the AC voltage between the AC input / output terminals 111a and 111b is on the negative side. The gate voltage is turned on, and a switching signal for turning off the gate voltages of the semiconductor switching elements Q1 (upper left arm) and Q4 (lower right arm) is output. Thereafter, the switching signal is similarly switched in synchronization with the switching of the positive and negative of the AC voltage.

As a result, as shown in FIG. 4B, the direct current rectification unit 120 of the AC / DC converter 100 rectifies the alternating current into direct current, and a direct current (C1) is output from the direct current output terminal 121a. Flow into.

In addition to the time of charging, control device 500 turns off the switching signal applied to each gate of semiconductor switching elements Q1, Q2, Q3, and Q4.

FIG. 5 is a diagram illustrating an operation performed by the three-phase bridge circuit 210 of the motor inverter 200 during charging. Arrows C <b> 11, C <b> 12, C <b> 13, C <b> 14, and C <b> 15 indicate currents flowing in the motor inverter 200 and the coils 11 and 12 of the motor 10 (flow direction).

At the time of charging, it is necessary to adjust the voltage (100 to 200 V) of the AC power supply 30 with respect to the voltage (300 V) of the power storage device 400. A coil is usually used for adjusting the voltage, but its shape becomes large when it corresponds to a large current. In this embodiment, the coils 11 and 12 of the motor 10 can be used as a voltage conversion coil.

When AC power supply 30 is electrically connected to AC input / output terminals 111a and 111b, control device 500 turns on the gate voltage of semiconductor switching element Q8 (middle lower arm), and other semiconductor switching elements Q5, A switching signal for turning off the gate voltages of Q6, Q7, Q9, and Q10 is output. As a result, as indicated by C11, C12, and C13, the DC current flowing from the DC output terminal 121a of the AC / DC converter 100 to the DC input terminal 201a is converted into the AC input / output terminal 203a, the coil 11 and the coil 12 of the motor 10. Through the AC input / output terminal 203b, the valve of the semiconductor switching element Q8 (middle lower arm) conducts and flows. The coils 11 and 12 of the motor 10 can be used as voltage conversion coils.

Next, when a sufficient current flows through the coils 11 and 12 of the motor 10, the control device 500 turns off the gate voltage of the semiconductor switching element Q8 (middle lower arm), and the gate of the semiconductor switching element Q7 (middle upper arm). A switching signal for turning on the voltage is output. As a result, the direction of the current is switched from C13 to C14. As indicated by C11, C12, C14, and C15, the direct current flowing from the direct current output terminal 121a of the AC / DC converter 100 to the direct current input terminal 201a is alternating current. The valve of the semiconductor switching element Q7 (middle upper arm) flows through the input / output terminal 203a, the coil 11, the coil 12, and the AC input / output terminal 203b of the motor 10, and flows from the DC input / output terminal 202a. C15) and flows into the bidirectional DC-DC converter 300 side. At this time, by appropriately changing the time during which the gate voltage of the semiconductor switching element Q8 (middle lower arm) is turned on, the amount of energy accumulated in the coils 11 and 12 of the motor 10 changes, and the DC input / output terminal 202a. , 202b can be adjusted.

FIGS. 6A and 6B are diagrams illustrating the operation performed by the bidirectional DC-DC converter 300 during charging. Arrows C 21, C 22, C 23, C 21 ′, C 22 ′, and C 23 ′ indicate current (flow direction) flowing through the bidirectional DC-DC converter 300.

When AC power supply 30 is electrically connected to AC input / output terminals 111a and 111b, control device 500 performs an operation of charging power storage device 400 by repeatedly performing the following switching operations (a) and (b). Do.

(A) A switching signal for turning on the gate voltages of the semiconductor switching elements Q11, Q14, Q15, and Q18 and turning off the gate voltages of the semiconductor switching elements Q12, Q13, Q16, and Q17 is output (FIG. 6A).
(B) A switching signal for turning on the gate voltages of the semiconductor switching elements Q12, Q13, Q16, Q17 and turning off the gate voltages of the semiconductor switching elements Q11, Q14, Q15, Q18 is output (FIG. 6B).

The direct current flowing from the direct current input / output terminal 202a of the motor inverter 200 to the first direct current input / output terminal 301a of the bidirectional DC-DC converter 300 by the switching operation (a) is indicated by C21, C22, and C23. As shown in FIG. 6A, the current flows through the bridge circuit 333, the transformer 310, and the bridge circuit 323.

Further, the direct current flowing from the direct current input / output terminal 202a of the motor inverter 200 into the first direct current input / output terminal 301a of the bidirectional DC-DC converter 300 by the switching operation of (b) is C21 ′, C22 ′. , C23 ′, the current flows through the bridge circuit 333, the transformer 310, and the bridge circuit 323.

As a result, from the first DC input / output terminal 301a of the bidirectional DC-DC converter 300, the plus side terminal 401a of the power storage device 400 via the bridge circuit 333, the transformer 310, the bridge circuit 323, and the second DC input / output terminal 302a. Current flows into the power storage device 400, and power from the AC power supply 30 is supplied to the power storage device 400.

Although the description has been made on the charging, the bidirectional DC-DC converter 300 performs the same operation as the switching operation shown in (a) and (b) described above even when the motor 10 is regenerating or power-running.

For example, when the voltage of the AC power supply 30 is 100 to 200 V and the voltage between the second DC input / output terminals 302 a and 302 b (the voltage between both terminals of the power storage device 400) is 300 V, The voltage between the 1 DC input / output terminals 301a and 301b varies between 50 and 700V. The control device 500 compares the voltage between the first DC input / output terminals 301a and 301b with the voltage between the second DC input / output terminals 302a and 302b (the voltage between both terminals of the power storage device 400), and performs charging. At the time of regeneration (during regeneration), the voltage between the first DC input / output terminals 301a and 301b is increased, and at the time of discharge (power running), the voltage between the first DC input / output terminals 301a and 301b is decreased. The phase and period of the switching signal applied to each of the semiconductor switching elements Q11 to Q18 are controlled.

(When running hard)
During power running, control device 500 performs control so that electric power corresponding to the required speed of motor 10 is supplied from power storage device 400 to motor 10.

When the motor 10 is powered, the control device 500 turns off the switching signals applied to the gates of the semiconductor switching elements Q1, Q2, Q3, and Q4 of the AC / DC converter 100. As a result, the function of the charging operation is stopped.

As described with reference to FIG. 6, at the time of power running, the control device 500 is similar to that shown in the above (a) and (b) for each of the semiconductor switching elements Q11 to Q18 of the bidirectional DC-DC converter 300. Apply switching signal repeatedly. However, the phase and period of the switching signal applied to each of the semiconductor switching elements Q11 to Q18 are controlled so that the voltage between the first DC input / output terminals 301a and 301b is lowered. 6A and 6B, a current flow in a direction opposite to the current direction indicated by C21 to C23 and C21 ′ to C23 ′ in FIGS. 6A and 6B is formed. The current is discharged, and the current is supplied from the first DC input / output terminal 301a of the bidirectional DC-DC converter 300 via the second DC input / output terminal 302a, the bridge circuit 323, the transformer 310, and the bridge circuit 333 to the motor inverter. It flows into the 200 DC input / output terminals 202a.

FIG. 7 is a diagram illustrating an operation performed by the three-phase bridge circuit 210 of the motor inverter 200 during power running. Arrows C31, C32, and C33 indicate the current (flow direction) that flows through the motor inverter 200 and the coils 11 and 12 of the motor 10, respectively.

FIG. 8 is a control map showing the relationship between the switching signal applied to the gates of the semiconductor switching elements Q5 to Q10 of the motor inverter 200 and the rotation angle of the motor 10 during power running. In FIG. 8, “PWM” indicates a switching signal corresponding to the PWM control.

The voltage accompanying the discharge from the power storage device 400 is applied between the DC input / output terminals 202a and 202b of the motor inverter 200, and a current flow indicated by C31 is formed. That is, the control device 500 turns on the gate voltage of the semiconductor switching element Q8 (middle lower arm) and outputs a PWM control signal corresponding to the desired rotation speed of the motor 10 to the gate of the semiconductor switching element Q5 (upper left arm). Output as a switching signal. As a result, as indicated by C31, C32, and C33, the DC current flowing from the first DC input / output terminal 301a of the bidirectional DC-DC converter 300 to the DC input / output terminal 202a is converted into the semiconductor switching element Q5 (upper left arm). ) Through the AC input / output terminal 203a, the coil 11, the coil 12, and the AC input / output terminal 203b of the motor 10, and further through the valve of the semiconductor switching element Q8 (middle lower arm). As a result, the motor 10 rotates (see the motor rotation angle “0” in FIG. 8). Hereinafter, control device 500 controls each of semiconductor switching elements Q5 to Q10 of motor inverter 200 according to the rotation angle of motor 10 according to the control map shown in FIG.

(Regeneration)
At the time of regeneration, the control device 500 controls the motor 10 to generate electric power according to the rotation angle of the motor 10 so that electric power is supplied from the motor 10 to the power storage device 400.

During regeneration of motor 10, control device 500 turns off switching signals applied to the gates of semiconductor switching elements Q1, Q2, Q3, and Q4 of AC / DC converter 100. Thereby, the function of the charging operation by AC power supply 30 is stopped.

FIG. 9 is a diagram illustrating an operation performed by the three-phase bridge circuit 210 of the motor inverter 200 during regeneration. Arrows C41, C42, C43, C44, and C45 indicate currents (flowing directions) that flow through the coils 11 and 12 of the motor inverter 200 and the motor 10, respectively.

FIG. 10 is a control map showing the relationship between the switching signal applied to the gates of the semiconductor switching elements Q5 to Q10 of the motor inverter 200 and the rotation angle of the motor 10 during regeneration.

Since a voltage corresponding to the voltage between both terminals of power storage device 400 is applied between DC input / output terminals 202a and 202b of motor inverter 200, a voltage higher than this is generated between DC input / output terminals 202a and 202b. The control device 500 outputs a switching signal that turns on the gate voltages of the semiconductor switching elements Q8 (middle lower arm) and Q6 (lower left arm) and turns off the gate voltage of the semiconductor switching element Q5 (upper left arm). As a result, as indicated by C41, C42, C43, and C44, the valve of the semiconductor switching element Q8 (middle lower arm) is made conductive, the AC input / output terminal 203b, the coil 12 of the motor 10, the coil 11, and the AC input / output terminal. The electric current flows through the valve 203a of the semiconductor switching element Q6 (lower left arm) and the motor 10 generates electric power (see the motor rotation angle “0” in FIG. 10).

If the voltage between the DC input / output terminals 202a and 202b of the motor inverter 200 is expected to be higher than the necessary voltage, the control device 500 turns on the gate voltages of the semiconductor switching elements Q8 (middle lower arm) and Q5 (upper left arm). The switching signal for turning off the gate voltage of the semiconductor switching element Q6 (lower left arm) is output. As a result, as indicated by C41, C42, C43, and C45, the valve of the semiconductor switching element Q8 (middle lower arm) is made conductive, the AC input / output terminal 203b, the coil 12 of the motor 10, the coil 11, and the AC input / output terminal. The electric current flows through the valve 203a of the semiconductor switching element Q5 (upper left arm) and flows through the electric current corresponding to the electric power generation action of the motor 10 from the DC input / output terminal 202a of the motor inverter 200. It is supplied to the converter 300 (see the motor rotation angle “0” in FIG. 10).

Hereinafter, control device 500 controls each of semiconductor switching elements Q5 to Q10 of motor inverter 200 according to the rotation angle of motor 10 according to the control map shown in FIG.

As described with reference to FIG. 6, at the time of regeneration, the control device 500 performs switching similar to that shown in the above (a) and (b) for each of the semiconductor switching elements Q11 to Q18 of the bidirectional DC-DC converter 300. Add signal repeatedly. However, the phase and period of the switching signal applied to each of the semiconductor switching elements Q11 to Q18 are controlled so that the voltage between the first DC input / output terminals 301a and 301b is increased. As a result, a current flow similar to the direction of current indicated by C21 to C23 and C21 ′ to C23 ′ in FIGS. 6A and 6B is formed, and the current from the DC input / output terminal 202a of the motor inverter 200 is formed. Flows into the positive terminal 401a of the power storage device 400 via the first DC input / output terminal 301a, the bridge circuit 333, the transformer 310, the bridge circuit 323, and the second DC input / output terminal 302a. It is charged by the power generated by the power generation action.

As described above, according to the present embodiment, when the power storage device 400 is charged with the power supplied from the AC power supply 30, the control device 500 uses the AC / DC converter 100 for the power supplied from the AC power supply 30. AC input / output terminals 111a and 111b, DC rectifier 120, DC output terminal 121a, DC input terminal 201a of motor inverter 200, coils 11 and 12 of motor 10, DC input / output terminal 202a of motor inverter 200, bidirectional DC− Bidirectional DC-DC converter 300 and motor inverter 200 are controlled to be supplied to power storage device 400 via first DC input / output terminal 301a and second DC input / output terminal 302a of DC converter 300 (during charging). ).

When the motor 10 is driven by the electric power of the power storage device 400, the control device 500 transmits the power stored in the power storage device 400 from the second DC input / output terminal 302 a of the bidirectional DC-DC converter 300. The bidirectional DC-DC converter 300 and the motor inverter 200 are supplied to the motor 10 via one DC input / output terminal 301a, the DC input / output terminal 202a of the motor inverter 200, and the AC input / output terminals 203a, 203b, 203c. Control (power running).

When the power storage device 400 is charged with the electric power generated by the regeneration of the motor 10, the control device 500 uses the AC input / output terminals 203a, 203b, 203c of the motor inverter 200 to generate the electric power generated by the regeneration of the motor 10. Bidirectional DC-DC converter 300 is supplied to power storage device 400 via DC input / output terminal 202a, first DC input / output terminal 301a and second DC input / output terminal 302a of bidirectional DC-DC converter 300. And controls the motor inverter 200.

Bidirectional DC-DC converter 300 and motor inverter 200 include switching elements Q5 to Q18 formed of FETs, and switching signals output from control device 500 are input to switching elements Q5 to Q18.

  The inverter 20 including the bidirectional DC-DC converter 300 and the motor inverter 200 is provided in the housing 19 of the motor 10.

  Therefore, according to the present embodiment, the following effects can be obtained.

1) The existing bidirectional which is provided for boosting or stepping down the electric power stored in the power storage device 400 and converting it into AC power and supplying it to the motor 10 to power-drive the motor 10 (electric motor action) The DC-DC converter 300, the motor inverter 200, and the coils 11 and 12 of the motor 10 also function as a step-up or step-down function of the charging device. For this reason, it is not necessary to separately provide a dedicated charging device, the number of components in the functional part as the charging device is reduced, and the installation space for that can be reduced, and it is easy to reduce the size and cost for in-vehicle use. . This makes it possible to provide the market with a charging device in the motor drive device 1 that is small and low-cost for in-vehicle use.
2) Since the switching elements Q5 to Q18 of the bidirectional DC-DC converter 300 and the motor inverter 200 are composed of FETs, there is no rectifier diode and there is little loss. Further, high efficiency can be achieved by switching at a high frequency. In addition, a reduction in the number of parts and low heat generation can be realized, which enables downsizing.
3) Since the inverter 20 including the bidirectional DC-DC converter 300 and the motor inverter 200 is provided in the housing 19 of the motor 10, the installation space for in-vehicle use can be reduced. In other words, the circuit used in the device is shared, and the functional portions of the inverter and the charging device are built in the motor housing 19 so that the overall size of the device can be reduced. Furthermore, the cable connecting the motor 10 and the motor inverter 200 can be shortened as much as possible, and the inductance component can be kept low. This makes it possible to replace the electrolytic capacitor for surge countermeasures with a film capacitor. Since the film capacitor has a longer life compared to the electrolytic capacitor, the life of the inverter 20 used in the motor drive device 1 can be extended.

DESCRIPTION OF SYMBOLS 1 Motor drive device, 10 Motor 11, 12, 13 Coil, 100 AC / DC converter, 200 Motor inverter, 300 Bidirectional DC-DC converter, 400 Power storage device, 500 Control device

Claims (4)

A charging device in a motor driving device including an AC / DC converter, a motor inverter, a motor including a coil, a bidirectional DC-DC converter, a power storage device, and a control device,
The AC / DC converter includes an AC input / output terminal electrically connected to an AC power source, a DC rectification unit electrically connected to the AC input / output terminal, and a DC current rectified by the DC rectification unit. DC output terminal to be output,
The motor inverter includes a DC input terminal electrically connected to a DC output terminal of the AC / DC converter, and a DC input electrically connected to a first DC input / output terminal of the bidirectional DC-DC converter. An output terminal and an AC input / output terminal electrically connected to the motor;
The bidirectional DC-DC converter includes a first DC input / output terminal electrically connected to a DC input / output terminal of the motor inverter, and a second DC input / output terminal electrically connected to the power storage device. And
When driving the motor with the power of the power storage device,
In the control device, the power stored in the power storage device is changed from the second DC input / output terminal of the bidirectional DC-DC converter to the first DC input / output terminal, and the DC input / output terminal of the motor inverter. , Controlling the bidirectional DC-DC converter and the motor inverter to be supplied to the motor via the AC input / output terminal,
When charging the power storage device with power supplied from the AC power supply,
In the control device, the power supplied from the AC power source includes the AC input / output terminal of the AC / DC converter, the DC rectification unit, the DC output terminal, the DC input terminal of the motor inverter, and a coil of the motor. , The DC input / output terminal of the motor inverter, the first DC input / output terminal of the bidirectional DC-DC converter, and the second DC input / output terminal to be supplied to the power storage device. A charging device in a motor drive device, characterized by controlling a DC-DC converter and a motor inverter. The bidirectional DC-DC converter and the motor inverter each include a switching element formed of an FET, and a switching signal output from the control device is input to the switching element. A charging device in a motor driving device. The charging device for a motor driving device according to claim 1, wherein the bidirectional DC-DC converter and the motor inverter are provided in a housing of the motor. When charging the power storage device with electric power generated by regeneration of the motor,
In the control device, the electric power generated by the regeneration of the motor receives the AC input / output terminal of the motor inverter, the DC input / output terminal, the first DC input / output terminal of the bidirectional DC-DC converter, the first 4. The bidirectional DC-DC converter and the motor inverter are controlled so as to be supplied to the power storage device via two DC input / output terminals. 5. A charging device in a motor driving device.