JP6157399B2 - DC power supply device and motor drive device - Google Patents

Description

  The present invention relates to a DC power supply device and an electric motor drive device.

  The technology related to a DC power supply device that converts an AC voltage supplied from an AC power supply into a desired DC voltage and supplies it to a load has been actively researched and developed. For example, Patent Document 1 below discloses an AC power supply. Discloses a technique that can supply a direct-current voltage that is approximately three times the peak value of the power supply voltage supplied to the load.

  The DC power supply device described in Patent Document 1 below has a charge pump circuit that can obtain a voltage double that of a single-phase AC power supply in two stages in parallel, and uses a reverse current blocking diode for each output. By combining them, a DC voltage approximately three times the peak value of the power supply voltage can be output.

  Further, the DC power supply device described in Patent Document 1 below has a power supply short-circuiting means and an opening / closing part that switches a rectification method, and controls the output voltage and enters the capacitor by controlling the on-period of the power supply short-circuiting means. The current peak value can be suppressed, and three rectification methods (full-wave rectification, voltage doubler rectification, and triple voltage rectification) can be switched at the switching part to output a voltage that is 1 to 3 times the power supply voltage peak. Yes.

International Publication No. 2013/061469

  However, the DC power supply described in Patent Document 1 outputs a voltage that is 1 to 3 times the power supply voltage peak by switching the rectification method at the opening and closing unit and controlling the output voltage by the power supply short-circuiting means. Therefore, there is a problem that the output voltage fluctuates suddenly when switching the rectification method. Further, according to the DC power supply device described in Patent Document 1, when the voltage is controlled at an intermediate voltage or more of the output voltage of each rectification method, the short-circuit current peak increases due to the extension of the ON period by the power supply short-circuit means. For this reason, there are problems such as an increase in cost due to an increase in component current capacity and an increase in circuit size.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a DC power supply device and an electric motor drive device capable of controlling the output voltage in a wide range while suppressing fluctuations in the output voltage.

In order to solve the above-described problems and achieve the object, the present invention rectifies an AC voltage supplied from an AC power source to generate a voltage higher than a double voltage, and a DC output from the rectifier A smoothing capacitor for smoothing the voltage, and each of the rectifiers is opened and closed several times during a half cycle of the AC voltage so as to generate a DC voltage that is 1 to 3 times the peak voltage of the AC power supply. Two open / close sections to be controlled, a rectifying element, and a capacitor , wherein the two open / close sections are simultaneously opened to closed, and the two open / close sections have the same closing period, and the two open / close sections There will open from its closed simultaneously, and the open period of the two closing parts to be the same as.

  According to the present invention, there is an effect that the output voltage can be controlled in a wide range while suppressing the fluctuation of the output voltage.

FIG. 1 is a diagram illustrating a configuration example of a DC power supply device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration example of the rectifying unit illustrated in FIG. 1. FIG. 3 is a first diagram illustrating a path of a current that flows when both of the two open / close units in the rectifying unit are in the ON state. FIG. 4 is a second diagram illustrating a path of a current that flows when both of the two open / close units in the rectifying unit are in the ON state. FIG. 5 is a diagram illustrating a current waveform when both of the two open / close units in the rectifying unit are in the on state. FIG. 6 is a diagram illustrating a first current waveform when two opening / closing sections in the rectifying section are opened / closed. FIG. 7 is a diagram illustrating a second current waveform when the two opening / closing sections in the rectifying section are opened / closed. FIG. 8 is a diagram illustrating an example in which the configuration of the DC power supply device according to the embodiment of the present invention is modified.

  Embodiments of a DC power supply device and an electric motor drive device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a DC power supply device 100 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration example of the rectifying unit 9 illustrated in FIG. 1. The DC power supply device 100 mainly includes a control unit 13, a reactor 2 having one end connected to one output end of the AC power supply 1 and the other end connected to the rectifying unit 9, and an AC output from the AC power supply 1. A phase detector 11 that detects the phase of the voltage, a rectifier 9 that rectifies the AC voltage supplied from the AC power supply 1 and converts it to a DC voltage and supplies it to the DC load 7, and detects the output voltage of the rectifier 9 And a smoothing capacitor 5 that smoothes the DC voltage output from the rectifying unit 9. The DC load 7 is connected in parallel with the smoothing capacitor 5. Note that E in FIG. 1 indicates a voltage output from the AC power supply 1, and I _in indicates a current flowing from the AC power supply 1.

  The rectifying unit 9 is divided into two rectifying units (rectifying unit 9a and rectifying unit 9b). The rectification unit 9b (one voltage doubler rectification unit) suppresses backflow from the rectifier diodes 3c and 3d that rectify alternating current into direct current, voltage doubler capacitors 4c and 4d that are charged and discharged every half wave of the power supply, and the smoothing capacitor 5. Backflow blocking diodes 6c and 6d. The rectifying unit 9b is an open / close unit disposed between the other end of the reactor 2 having one end connected to one output end of the AC power supply 1 and a connection point between the voltage doubler capacitor 4c and the voltage doubler capacitor 4d. 8b.

  The rectification unit 9a (the other voltage doubler rectification unit) includes rectifier diodes 3a and 3b that rectify alternating current into direct current, voltage doubler capacitors 4a and 4b that are charged and discharged every half wave (half cycle), and a smoothing capacitor 5. The reverse current blocking diodes 6a and 6b are configured to suppress the reverse current. The rectifying unit 9a includes an opening / closing unit 8a disposed between the other output terminal of the AC power supply 1 and a connection point between the voltage doubler capacitor 4a and the voltage doubler capacitor 4b. The opening / closing part 8a and the opening / closing part 8b are constituted by bidirectional switches made of, for example, a semiconductor element.

  The control unit 13 performs opening / closing control of the opening / closing unit 8 a and the opening / closing unit 8 b based on the phase detection value detected by the phase detector 11 and the voltage detection value detected by the voltage detector 12.

  2 can be configured by, for example, a diode bridge and a switching element, but the present invention is not limited by the configuration of the switching unit 8a and the switching unit 8b. Absent.

Next, the operation of the DC power supply apparatus 100 will be described with reference to FIGS. FIG. 3 is a first diagram illustrating a path of a current that flows when both of the two open / close units 8a and 8b in the rectifying unit 9 are in the ON state. FIG. 4 is a second diagram illustrating a path of a current that flows when both of the two open / close units 8a and 8b in the rectifying unit 9 are on. FIG. 5 is a diagram illustrating a current waveform when both of the two open / close units 8a and 8b in the rectifying unit 9 are in the on state. FIG. 5B shows a waveform of the power supply current I _in (I1, I3) flowing through the paths shown in FIG. 3A and FIG. 4A, and FIG. The waveform of the power supply current I _in (I2, I4) flowing through the path shown in (b) and FIG. 4 (b) is shown. The arrow in FIG. 5D indicates the voltage zero-cross timing of the AC power supply 1. FIG. 6 is a diagram showing a first current waveform when the two opening / closing sections 8a and 8b in the rectifying section 9 are opened / closed. The FIG. 6 (a), the illustrated waveforms of the AC power supply 1 in the power supply voltage E, in FIG. 6 (b), the waveform of the supply current I _in flowing when closing portion 8a and a switching portion 8b is controlled to open and close Indicates. FIG. 6C shows a waveform of the switching signal 13a output from the control unit 13 to the rectifying unit 9, and the switching signal 13a in the illustrated example switches the switching unit 8a and the switching unit 8b five times in the half cycle of the power source. The ON period of the opening / closing part 8a and the opening / closing part 8b (indicated by an arrow) is constant without change, and the OFF period of the opening / closing part 8a and the opening / closing part 8b (indicated by OFF by an arrow). ) Period is also constant. FIG. 6D shows an ON period of the opening / closing part 8a and the opening / closing part 8b when the SIN function is not changed.

In the example of FIG. 1, it is assumed that the direction indicated by the arrow in the figure is the positive polarity of the power supply voltage E, and the power supply current Iin flows _in this direction. Here, first, the operation when the opening / closing part 8a and the opening / closing part 8b are in the ON state will be described. It is assumed that electric charges are accumulated in voltage doubler capacitors 4b and 4c, and voltages Vb and Vc at both ends of each capacitor are substantially equal to the peak value of power supply voltage E.

  When the power supply voltage E gradually rises from the timing of time t0 in FIG. 5 (timing of voltage zero crossing), the current I1 is changed from AC power supply 1 → reactor 2 → opening / closing part 8b → double voltage capacitor as shown in FIG. The current flows through the path 4c → reverse current blocking diode 6c → smoothing capacitor 5 → reverse current blocking diode 6b → voltage doubler capacitor 4b → opening / closing part 8a → AC power supply 1. As a result, the voltage Vo between both ends of the smoothing capacitor 5 becomes a value obtained by adding the power supply voltage E, the voltage Vc across the voltage doubler capacitor 4c, and the voltage Vb across the voltage doubler capacitor 4b (Vo = E + Vc + Vb).

If the power supply voltage E rises further, it flows the supply current I _in two paths as shown in FIG. 3 (b) at time t1 in FIG. 5. That is, the current I2 is a path of AC power source 1 → reactor 2 → rectifier diode 3a → voltage doubler capacitor 4a → switching unit 8a → AC power source 1 and AC power source 1 → reactor 2 → switching unit 8b → voltage doubler capacitor 4d → rectifier. It starts to flow along the path of the diode 3d → the AC power source 1.

FIG. 3 (a), by flowing a current I1, I2 to as in (b), however, the power supply current I _in has a value obtained by adding the current I1 and the current _{I2 (I in = I1 + I2} ). As a result, electric charges are accumulated in the voltage doubler capacitors 4a and 4d, and the voltages Va and Vd at both ends become substantially equal to the peak value of the power supply voltage E.

  Subsequently, when the power supply voltage E of the AC power supply 1 changes to the negative polarity at the time t2 in FIG. 5, the current I3 is changed from the AC power supply 1 → the opening / closing part 8a → the voltage doubler capacitor 4a → as shown in FIG. The reverse current blocking diode 6a → the smoothing capacitor 5 → the reverse current blocking diode 6d → the voltage doubler capacitor 4d → the switching unit 8b → the reactor 2 → the AC power source 1 flows. As a result, the both-end voltage Vo of the smoothing capacitor 5 becomes a value (Vo = E + Va + Vd) obtained by adding the power supply voltage E, the both-end voltage Va of the voltage doubler capacitor 4a, and the both-end voltage Vd of the voltage doubler capacitor 4d.

Further, in the timing of time t3 in FIG. 5 through the supply current I _in two paths as in Figure 4 (b). That is, the current I4 is expressed as follows: AC power source 1 → rectifier diode 3c → voltage doubler capacitor 4c → opening / closing unit 8b → reactor 2 → AC power source 1; AC power source 1 → switching unit 8a → voltage doubler capacitor 4b → rectifier diode 3b → It begins to flow through the path of reactor 2 → AC power supply 1.

FIG. 4 (a), the by flowing current I3, I4 so as in (b), however, the power supply current I _in has a value obtained by adding the current I3 and current _{I4 (I in = I3 + I4} ). As a result, charges are accumulated in the voltage doubler capacitors 4b and 4c, and the voltages Vb and Vc at both ends become substantially equal to the peak value of the power supply voltage E.

  By repeating the above operation, the smoothing capacitor 5 has the voltages Va, Vb, Vc, Vd of each of the voltage doubler capacitors 4a, 4b, 4c, 4d charged to a value substantially equal to the peak value of the power supply voltage E, and The battery is charged with a voltage obtained by adding the power supply voltage E of the AC power supply 1. With this series of operations, a DC voltage that is twice to three times the peak value of the power supply voltage E can be generated.

Next, the operation when the opening / closing part 8a and the opening / closing part 8b are in the OFF state will be described. When the switching unit 8a and the switching unit 8b are off and the power source is positive, the power source current _Iin is AC power source 1 → reactor 2 → rectifier diode 3a → backflow blocking diode 6a → smoothing capacitor 5 → backflow blocking diode 6d → It flows through the path of the rectifier diode 3d → the AC power source 1. When the power source is negative, the power source current I _in is a path of AC power source 1 → rectifier diode 3c → reverse current blocking diode 6c → smoothing capacitor 5 → reverse current blocking diode 6b → rectifier diode 3b → reactor 2 → AC power source 1. Current flows. By this series of operations, the circuit operates as a full-wave rectifier circuit and can generate a DC voltage equal to or lower than the peak value of the power supply voltage E.

  As described above, by opening / closing the opening / closing unit 8a and the opening / closing unit 8b, the rectification operation is switched at least once during the half cycle of the power supply, and the direct current is approximately 1 to 3 times the peak value of the power supply voltage E. A voltage is generated. This opening / closing operation is controlled by the control unit 13. Specifically, based on the phase detection value from the phase detector 11, the control unit 13 turns on the switching unit 8a and the switching unit 8b so that the output voltage to the DC load 7 becomes a desired value (FIG. 6). (See (c)). Further, the control unit 13 controls the opening / closing unit 8a and the opening / closing unit 8b to be simultaneously turned on at a timing when a predetermined time has elapsed from the reference point with respect to the voltage zero cross of the power supply voltage E, and the above-described calculated ON period has elapsed Later, the opening / closing part 8a and the opening / closing part 8b are simultaneously turned off.

  In the example of FIG. 6, for example, the power supply voltage E is 100 V, the cycle of the power supply voltage E is Tc, the half cycle of the power supply voltage E is Tc / 2, the cycle obtained by dividing the cycle Tc by 10 is Tc / 10, and the bus for the power supply frequency 50 Hz The voltage command value is 300 V, and the open / close unit 8a and the open / close unit 8b are turned on and off five times during the period Tc / 2. Depending on the ratio of the on period and the off period, the on period has a value lower than the cycle Tc / 10. However, since both the on period and the off period do not change, a constant value as shown in FIG. Become. As described above, the rectifying operation is switched by opening / closing the opening / closing portion 8a and the opening / closing portion 8b, and the average value of the DC voltage applied to the smoothing capacitor 5 is controlled to coincide with the target value (bus voltage command value). ing.

  Thereby, the value of the voltage charged in the smoothing capacitor 5 can be suppressed to a predetermined value. Therefore, an element with a low withstand voltage and a low cost can be used as the smoothing capacitor 5, and the DC power supply device 100 can be reduced in size and cost.

  In addition, the DC voltage applied to the smoothing capacitor 5 can be continuously controlled, and the DC power supply device 100 having a high degree of freedom in output voltage and high stability can be obtained.

  Further, by appropriately selecting the capacity of the smoothing capacitor 5 with respect to the DC load 7, it is possible to suppress the current peak compared to the case where the DC voltage of the smoothing capacitor 5 is controlled by the short-circuit means as in the prior art described above. It becomes possible. Therefore, it is possible to suppress a decrease in component life, suppress an increase in component capacity, and suppress voltage distortion due to power source impedance.

  A control method of the opening / closing part 8a and the opening / closing part 8b for improving the power factor will be described.

FIG. 7 is a diagram illustrating a second current waveform when the two opening / closing sections 8a and 8b in the rectifying section 9 are opened / closed. While on-period shown in FIG. 6 (c) is constant in the supply half cycle, by varying the ON period in the power supply half cycle as shown in FIG. 7 (c), the flowing period of the power source current I _in Can be expanded to improve the power factor. FIG. 7D shows the ON period when the SIN function is changed in the half cycle of the power supply.

As described with reference to FIG. 2, when the switching unit 8a and the switching unit 8b are on, the power source current I _in flows largely near the peak of the power source voltage E, and the power source current I _in substantially flows near 0 V of the power source voltage E. Not. Therefore, in the vicinity of the peak of the power supply voltage E, by giving the time to turn off the switching unit 8a and the opening and closing portion 8b, it limits the charging timing to the smoothing capacitor 5, to extend the flowing period of the power source current I _in Therefore, the power factor can be improved.

The operation waveform example of FIG. 7 shows a power supply voltage 100V, a cycle of the power supply voltage E is Tc, a half cycle of the power supply voltage E is Tc / 2, a cycle obtained by dividing the cycle Tc by 10 is Tc / 10, and a bus voltage with respect to a power supply frequency of 50 Hz. Assuming that the command value is 300V, the opening / closing part 8a and the opening / closing part 8b are turned on three times and turned off twice during the period Tc / 2. Tc / 10 shown in FIG. 7 (c) is the same period as Tc / 10 shown in FIG. 6 (c). The opening / closing part 8 a and the opening / closing part 8 b are controlled to open and close at a frequency equal to or higher than the power supply voltage frequency of the AC power supply 1. Further, the ratio of the off period is controlled near the peak of the power supply voltage E as compared to the region other than the vicinity of the peak of the power supply voltage E. Accordingly, in the region other than the vicinity of the peak of the power supply voltage E, the on period is substantially equal to the period Tc / 10. However, the on period is relatively increased by the period Tc / 10 by extending the off period as the power supply voltage E approaches the peak. (FIG. 7D). As described above, the ON period in the vicinity of the peak of the power supply voltage E is changed in a SIN function in the half cycle of the power supply so as to be shorter than the ON period in the region other than the vicinity of the peak of the power supply voltage E. As a result, the period during which the power source current I _in is passed is extended, and the power source power factor is improved.

  In this embodiment, an example in which the opening / closing part 8a and the opening / closing part 8b are simultaneously opened / closed has been described. However, the same effect can be obtained by controlling the opening / closing part 8a and the opening / closing part 8b to be switched at different timings. It goes without saying that it is obtained. Further, in the present embodiment, the number of switching times of the opening / closing part 8a and the opening / closing part 8b is not limited to the illustrated example, and may be different. In this embodiment, the ON period of the opening / closing part 8a and the opening / closing part 8b is changed in a SIN function, but the control method of the ON period is not limited to this.

  FIG. 8 is a diagram showing an example in which the configuration of the DC power supply device 100 according to the embodiment of the present invention is modified. In the illustrated DC power supply device 100, the short-circuit unit 10 is used for the purpose of improving the power factor by short-circuiting the AC power source 1, and the short-circuit unit 10 is controlled by the control unit 13. By using the voltage zero cross of the power supply 1 as a reference, the path between the AC power supply 1 and the rectifying unit 9 is short-circuited by controlling the short-circuit unit 10 after a predetermined time has elapsed from this reference point. During the period in which the short-circuit unit 10 is on, the output terminal to the rectifier unit 9 is short-circuited, and no current flows through the rectifier unit 9. That is, no current flows through any of the paths shown in FIGS. When the short-circuit portion 10 changes from on to off, the peak value of the inrush current is suppressed by the energy stored in the reactor 2, and the peak current is suppressed, so that a diode having a small current capacity and a low loss is connected to the backflow prevention diode 6a. The circuit of the DC power supply apparatus 100 can be configured at low cost and with low loss. Needless to say, the harmonic current can be suppressed by controlling the switching in consideration of the number of times of switching, the inductance value of the reactor 2, the load, and the like.

  As the backflow prevention diodes 6a, 6b, 6c, and 6d according to the present embodiment, it is preferable to use an FRD (fast recovery diode) or the like having a short reverse recovery time. Further, as the rectifier diodes 3a, 3b, 3c, 3d and the open / close sections 8a, 8b, generally, Si-based semiconductors made of silicon (Si: silicon) are mainly used, but silicon carbide (SiC) Alternatively, a wide band gap (WBG) semiconductor made of gallium nitride (GaN) or diamond may be used.

  A semiconductor element formed of such a WBG semiconductor has high voltage resistance and high allowable current density. Therefore, it is possible to reduce the size of the semiconductor element. By using these reduced-sized semiconductor elements, the rectifier module can be reduced in size, and as a result, the DC power supply device 100 configured using these rectifier modules. Can be reduced in size and weight.

  Moreover, the semiconductor element formed of such a WBG semiconductor has high heat resistance. Therefore, since the heat sink fins of the heat sink can be downsized and the water cooling unit can be down cooled, the DC power supply device 100 can be further downsized.

  Further, a semiconductor element formed of such a WBG semiconductor has low power loss. Therefore, it is possible to increase the efficiency of the semiconductor element, and consequently, increase the efficiency of the DC power supply device 100.

  Although each semiconductor element is preferably formed of a WBG semiconductor, at least one of these semiconductor elements may be formed of a WBG semiconductor, and the above-described effects can be obtained.

  Further, the DC power supply device 100 according to the present embodiment includes an electric motor drive device (not shown) provided with a drive unit that converts a DC voltage output from the DC power supply device 100 into an AC voltage and drives an electric motor (not shown). Therefore, even if the motor is a permanent magnet motor that does not use a rare earth magnet, a higher DC voltage can be supplied than general full-wave rectification or voltage doubler rectification. It is possible to drive an electric motor with an increased number of turns so as to obtain the same performance as an electric motor using a magnet.

  In addition, the permanent magnet motor whose loss does not change even when the DC voltage is high (especially in the light torque operation state that does not require a high voltage and the high rotation operation state that requires a high voltage, the loss does not depend on the applied voltage. In the case of a permanent magnet electric motor that does not change), it is better to have the configuration in which the open / close unit 8a and the open / close unit 8b are turned on and driven at all times with a DC voltage that is three times the voltage peak value of the AC power supply 1. Loss is reduced. In particular, this tendency is strong in a permanent magnet motor using a magnet having a smaller magnetic force than rare earth elements such as ferrite. Therefore, it can be said that the DC power supply device 100 is suitable as a power supply device for an inverter that drives a permanent magnet electric motor configured using a permanent magnet other than a rare earth element.

  Further, by configuring the drive unit of the electric motor drive device using a wide band gap semiconductor, the drive unit can be further reduced in size and weight.

  As described above, the DC power supply device 100 according to the present embodiment rectifies the AC voltage supplied from the AC power supply 1 to generate a voltage higher than the double voltage, and outputs from the rectifier 9. And a smoothing capacitor 5 for smoothing the DC voltage to be generated, and the rectifying unit 9 is an open / close unit (8a, 8a, 8b) that is controlled to generate a DC voltage that is 1 to 3 times the peak voltage of the AC power source 1. 8b), rectifying elements (3a to 3d), and capacitors (4a to 4d). With this configuration, it is possible to control the output voltage in a wide range while suppressing fluctuations in the output voltage, and it is possible to reduce the size and weight of the DC power supply device 100 and reduce the cost.

  Note that the configuration shown in the embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined within the scope of the present invention. Of course, it is possible to change the configuration such as omitting the part.

  As described above, the present invention can be applied to a DC power supply device, and is particularly useful as an invention that can control an output voltage in a wide range while suppressing fluctuations in the output voltage.

  1 AC power source, 2 reactor, 3a, 3b, 3c, 3d rectifier diode, 4a, 4b, 4c, 4d voltage doubler capacitor, 5 smoothing capacitor, 6a, 6b, 6c, 6d reverse current blocking diode, 7 DC load, 8a, 8b Open / close unit, 9 rectifier unit, 9a rectifier unit (the other voltage doubler rectifier unit), 9b rectifier unit (one voltage doubler rectifier unit), 10 short circuit unit, 11 phase detector, 12 voltage detector, 13 control unit, 100 DC power supply.

Claims (9)

A rectifying unit that rectifies an AC voltage supplied from an AC power source and generates a voltage that is equal to or higher than a double voltage;
A smoothing capacitor for smoothing the DC voltage output from the rectifying unit;
With
The rectifying unit includes two open / close units each controlled to be opened and closed a plurality of times during a half cycle of the AC voltage, so as to generate a DC voltage that is 1 to 3 times the peak voltage of the AC power supply, With a capacitor ,
The two opening / closing parts are simultaneously opened from the closing, and the closing period of the two opening / closing parts is the same,
The two closing portion is opened from the closed simultaneously, and the DC power supply open period to be the same as the two closing parts. The rectifier is divided into two voltage doubler rectifiers,
The open / close unit included in one of the voltage doubler rectifiers is between the other end of the reactor whose one end is connected to one output terminal of the AC power supply, and a connection point between two capacitors constituting the voltage doubler rectifier. Placed in
Closing portion provided in the other of the voltage doubler rectifier unit, wherein the other output end of the AC power supply, the 請 Motomeko 1 that will be disposed between the connection point of two capacitors constituting the voltage doubler rectifier unit DC power supply. Wherein each of the two closing portions, wherein in response to the phase of the power supply voltage of the AC power supply, DC power supply device according to 請 Motomeko 1 or 2 that are controlled so as to change the ratio between the closing time period between the opening period. Wherein each of the two closing portions, a DC power supply device according to any one of 3 from 請 Motomeko 1 with the supply voltage frequency or higher frequency of the alternating current power supply Ru controlled to open and close. Wherein each of the two closing portions, a DC power supply according bidirectional switch der Ru from 請 Motomeko 1 in any one of the 4 composed of semiconductor elements. Each of the two closing portions, according to any one of 請 Motomeko 1 to 5 that have a short-circuit portion for short-circuiting the AC power supply via one connected reactor to the output end of the AC power source DC power supply. DC power supply device according to any one of claims 1 to 6,
A drive unit that converts the DC voltage output from the DC power supply device into an AC voltage to drive the motor;
Electric motive drive system including a. The drive unit includes an electric motor driving device according to 請 Motomeko 7 you drive the electric motor that is configured with permanent magnets other than rare earth magnet. The direct-current power supply and said drive unit includes an electric motor driving device according to 請 Motomeko 7 or 8 that has been configured using a wide band gap semiconductor.

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