JP2019097278A - Power supply device - Google Patents

Abstract

To provide a power supply device capable of suppressing current variations of a plurality of arms of each output phase with a simple configuration, improving manufacturability, and reducing equipment cost.SOLUTION: A power supply device includes a U-phase and a V-phase and includes, for each output phase, output conductors 123U and 123V, a plurality of arms U1 to U4 and V1 to V4 each including two switching elements 122A1 and 122B1 connected in series, and connection conductors 124U and 124V connecting series connection points of the two switching elements 122 of each of the plurality of arms U1 to U4 and V1 to V4 to the output conductors 123U and 123V.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply device.

  2. Description of the Related Art Conventionally, in capacity control of the output of a load such as an induction motor or induction heating device having an inductance component, a power supply device capable of adjusting the frequency of AC power supplied to the load is used. The power supply device temporarily converts AC power supplied from a commercial power source into DC power with a forward conversion circuit, and converts this DC power into AC power with a reverse conversion circuit to obtain AC power of a desired frequency. A configuration that is designed to be

  The maximum output of the inverse conversion circuit is mainly determined by the capacity of the power control switching element employed in the inverse conversion circuit. When the output is small, for example, in a power supply having two U-phase and V-phase outputs, as shown in FIG. 10, one arm is provided for each phase, in which two switching elements Q are connected in series. Consists of simple circuits.

  However, in the reverse conversion circuit where a larger output is required, a plurality of arms are connected in parallel for each phase (see, for example, Patent Document 1). Such an inverse transformation circuit is a circuit widely used particularly in a low frequency region, and when the frequency is increased to, for example, several tens of kHz or more, a plurality of parallel inductance circuits are connected due to a slight difference in inductance between the arms. The current of each arm varies. Then, the structure which suppresses the dispersion | variation in the electric current of each of several arm is also known (for example, refer patent document 2, 3).

  In Patent Document 2, as shown in FIG. 11, a cylindrical core T made of a magnetic substance as a balancer is used, and a combination different from four conducting wires L connecting the arms U1 to U4 and the output terminal t is used. Two conductive wires L to be selected are inserted into one core T, and one conductive wire L is inserted into the core T from one axial end of the core T, and the other conductive wire L is the other axial end of the core T It is inserted from the side. When the current values flowing through the two conducting wires L inserted into one core T are the same, the magnetic fluxes generated in the core T cancel each other, and the core T does not act as an inductor. On the other hand, when the current values are different, a magnetic flux is generated in the core T according to the magnitude of the difference between the current values, and an inductance corresponding to the generated magnetic flux is generated in the core T. The inductance acts to reduce variations in the current flowing through the two conductors L. In Patent Document 2, the variation of the current is suppressed to 5% or less by the plurality of cores T.

  In Patent Document 3, as shown in FIG. 12, one U-phase arm and one V-phase arm constitute one system of inverse transformation circuit, and a total of four systems of inverse transformation circuits (blocks 1 to 4) are constituted. And are connected to a pair of output conductors 320 for each block. Then, based on the inductance between the connection position of the block 4 connected to the farthest position from the pair of output terminals 330 and the pair of output terminals 330, for example, between the connection position of the block 1 and the pair of output terminals 330 The distance between the conductors of the pair of connecting conductors connecting the block 1 to the pair of output conductors 320 is increased so as to have the same inductance as the difference between the inductance and the reference. Similarly, the distance between the conductors of the pair of connection conductors of each of the blocks 2 and 3 is increased according to the connection position of the blocks 2 and 3. This configuration suppresses the occurrence of variations in the currents of the arms of the four inverse conversion circuits due to the difference in inductance.

Patent No. 2816692 gazette Unexamined-Japanese-Patent No. 11-299252 Patent No. 4445216

  In the power supply device described in Patent Document 2, the inverse conversion circuit is limited to the circuit configuration of the even system, and lacks versatility. On the other hand, in the power supply device described in Patent Document 3, the inverse conversion circuit is not limited to the circuit configuration of the even system, and versatility can be improved. However, when the inductance between a pair of connecting conductors is increased by widening the distance between the pair of connecting conductors in each block, the inductance increases as the conductor width of the connecting conductor decreases. Will increase. In order to reduce the loss due to the connecting conductor, a corresponding conductor width is required, and when the corresponding conductor width is secured, the pair of connecting conductors for obtaining the necessary inductance when the number of reverse conversion circuits is relatively large. There is a possibility that the distance between the conductors becomes excessively large and the structure becomes complicated. In addition, when the distance between the conductors is several tens of mm or more, the inductance does not change much even if the distance between the conductors is increased, and there is also a possibility that the necessary inductance can not be obtained. Then, as the distance between the conductors increases, the leakage flux to the periphery of the arm increases, and there is a concern that the noise to the switching element and its control board is increased, and the switching element and its control board are inductively heated by the leakage flux. Local heating is also a concern.

  SUMMARY OF THE INVENTION In view of such problems, the present invention provides a power supply apparatus capable of suppressing current variations of a plurality of arms of each output phase with a simple configuration, and improving productivity and reducing apparatus cost. The purpose is

  A power supply device according to one aspect of the present invention is a power supply device that converts direct current power into alternating current power having a plurality of phases of output and outputs the two power sources connected in series with an output conductor for each output phase. A plurality of arms each including a switching element, and a connection conductor connecting a series connection point of the two switching elements of each of the plurality of arms to the output conductor.

  According to the present invention, it is possible to provide a power supply device capable of suppressing the current variation of a plurality of arms of each output phase with a simple configuration, improving the productivity and reducing the cost of the device.

It is a block diagram of an example of a power supply device for describing an embodiment of the present invention. It is a circuit diagram of the reverse conversion circuit of the power supply device of FIG. It is a front view of an example of the reverse conversion circuit of the power supply device of FIG. FIG. 5 is a side view of the inverse transformation circuit of FIG. 3; It is a top view of the inverse transformation circuit of FIG. It is a front view of the modification of the inverse transformation circuit of FIG. It is a front view of the other example of the inverse transformation circuit of the power supply device of FIG. It is a schematic diagram of the electric current which flows through the connection conductor of the inverse transformation circuit of FIG. It is a schematic diagram of the electric current which flows through a connection conductor in case the notch is abbreviate | omitted from the connection conductor of the inverse transformation circuit of FIG. It is a circuit diagram of the reverse conversion circuit of the conventional power supply device. It is a schematic diagram of the reverse conversion circuit of the other conventional power supply device. It is a schematic diagram of the reverse conversion circuit of the other conventional power supply device.

  FIG. 1 is a block diagram of a power supply device for explaining an embodiment of the present invention. FIG. 2 is a circuit diagram of an inverse conversion circuit of the power supply device of FIG.

[Configuration of Power Supply Device]
The power supply device 100 shown in FIG. 1 converts AC power supplied from a commercial power source into AC power of a predetermined frequency, and includes a forward conversion circuit 110 and an inverse conversion circuit 120.

  The forward conversion circuit 110 converts alternating current power supplied from a commercial alternating current power supply into direct current power, and supplies the converted direct current power to the reverse conversion circuit 120. The forward conversion circuit 110 includes, for example, a thyristor, which is an active rectifying element having a gate that is a control electrode, and a smoothing element, which is a smoothing element that smoothes DC power including pulsation rectified by the thyristor. There is. The thyristor is controlled such that the voltage or current of the direct current or alternating current output becomes a predetermined one by controlling the conduction time. Also, instead of an active rectifying element such as a thyristor, rectifying may be performed using a passive rectifying element, for example, a diode.

  The reverse conversion circuit 120 converts the direct current power supplied from the forward conversion circuit 110 into alternating current power having outputs of multiple phases and outputs the alternating current power. In this example, the load connected to the output of the inverse conversion circuit 120 is an induction heating coil, and the inverse conversion circuit 120 is described as having two-phase output of U phase and V phase. The circuit 120 may have three-phase outputs of U-phase, V-phase and W-phase, and the number of phases of the output is appropriately set according to the load.

  As shown in FIG. 2, the reverse conversion circuit 120 has a pair of input terminals 121 to which direct current power is supplied from the forward conversion circuit 110. A capacitor C is connected between the pair of input terminals 121. In addition, a pair of switching elements 122 such as MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors) made of Si or SiC, IGBTs (Insulated Gate Bipolar Transistors), etc. An arm in which the source 122 is connected in series to the drain of the other switching element 122 is connected in parallel for each of the U phase and the V phase. A control voltage signal sent from a phase locked loop circuit (not shown) is input to the gate of each switching element 122. The phase locked loop circuit controls so that the frequency of the AC power output from the power supply device 100 becomes the resonant frequency of the load.

  In this example, four arms are provided for each of the U and V phases, and the switching elements 122A1 and 122B1 form a first U-phase arm U1, and the switching elements 122A2 and 122B2 form a second U-phase. The arm U2 is configured, the switching elements 122A3 and 122B3 configure a third U-phase arm U3, and the switching elements 122A4 and 122B4 configure a fourth U-phase arm U4. Similarly, switching elements 122C1 and 122D1 form a first V-phase arm V1, switching elements 122C2 and 122D2 form a second V-phase arm V2, and switching elements 122C3 and 122D3 form a third V-phase arm V3. The fourth V-phase arm V4 is configured by the switching elements 122C4 and 122D4. A plurality of U-phase arms and V-phase arms may be provided, and the number of arms is appropriately set according to the maximum output of the power supply apparatus 100.

  Inversion circuit 120 further includes a U-phase output conductor 123U and a V-phase output conductor 123V, and a U-phase connection conductor 124U and a V-phase connection conductor 124V. U-phase connection conductor 124U is connected to a series connection point of two switching elements 122 of U-phase arms U1 to U4 and U-phase output conductor 123U, and U-phase arms U1 to U4 are common connection conductors The U-phase output conductor 123U is connected via 124U. V-phase connection conductor 124V is connected to the series connection point of two switching elements 122 of V-phase arms V1 to V4 and V-phase output conductor 123V, and V-phase arms V1 to V4 are connected in common It is connected to the V-phase output conductor 123V via the conductor 124V. The U-phase output conductor 123U is provided with an output terminal 125U, the V-phase output conductor 123V is provided with an output terminal 125V, and a load is connected to these output terminals 125U, 125V. As the U-phase output conductor 123U, the V-phase output conductor 123V, the U-phase connection conductor 124U, and the V-phase connection conductor 124V, for example, a bus bar made of copper having excellent conductivity is used.

  FIGS. 3 to 5 show configuration examples of the inverse conversion circuit 120. FIG.

  The switching elements 122A1 and the switching elements 122B1 constituting the U-phase arm U1 are individually modularized, and are disposed back to back with the copper plate 126U as a radiator. The two switching elements 122 of each of the U-phase arms U2 to U4 are also arranged back to back with the copper plate 126U interposed therebetween. The two switching elements 122 of each of the U-phase arms U1 to U4 arranged back to back with the copper plate 126U interposed therebetween are connected in series by a bridge conductor 127U.

  U-phase arms U1 to U4 are arranged in a line along copper plate 126U, and copper plate 126U is provided across U-phase arms U1 to U4. The heat generated in the two switching elements 122 of each of the U-phase arms U1 to U4 with the energization is transmitted to the copper plate 126U, and the switching elements 122 are thermally dissipated. The copper plate 126U is closely provided with a pipe (not shown) through which the coolant flows, and the copper plate 126U is cooled by the coolant.

  The U-phase connecting conductor 124U is formed in a substantially rectangular plate shape, and includes a first side E1 extending in the arranging direction of the U-phase arms U1 to U4, a second side E2 facing the first side E1, and a first side A third side E3 connects one ends of the E1 and the second side E2, and a fourth side E4 connects the other ends of the first side E1 and the second side E2. The first side E1 is connected to the bridge conductor 127U, that is, connected to a series connection point of two switching elements 122 of each of the U-phase arms U1 to U4. The second side E2 is connected to the U-phase output conductor 123U. The U-phase connection conductor 124U is closely provided with a pipe (not shown) through which the coolant flows, and the U-phase connection conductor 124U is cooled by the coolant.

  U-phase output conductor 123U extends in the direction in which U-phase arms U1 to U4 are aligned, and output terminal 125U of U-phase output conductor 123U is provided at one end in the extending direction of U-phase output conductor 123U.

  The switching elements 122C1 and the switching elements 122D1 constituting the V-phase arm V1 are individually modularized and disposed back to back with a copper plate 126V as a radiator. The two switching elements 122 of each of the V-phase arms V2 to V4 are also arranged back to back across the copper plate 126V. The two switching elements 122 of each of the V-phase arms V1 to V4 arranged back to back across the copper plate 126V are connected in series by the bridge conductor 127V.

  The V-phase arms V1 to V4 are arranged in a line along the copper plate 126V, and the copper plate 126V as a radiator is provided across the V-phase arms V1 to V4. The heat generated in the two switching elements 122 of each of the V-phase arms V1 to V4 with the energization is transmitted to the copper plate 126V, and the switching elements 122 are thermally radiated. The copper plate 126V is closely provided with a pipe (not shown) through which the coolant flows, and the copper plate 126V is cooled by the coolant.

  The V-phase connecting conductor 124V is formed in a substantially rectangular plate shape, and has a first side E1 extending in the arranging direction of the V-phase arms V1 to V4, a second side E2 facing the first side E1, and a first side A third side E3 connects one ends of the E1 and the second side E2, and a fourth side E4 connects the other ends of the first side E1 and the second side E2. The first side E1 is connected to the bridge conductor 127V, that is, connected to a series connection point of two switching elements 122 of each of the V-phase arms V1 to V4. The second side E2 is connected to the V-phase output conductor 123V. A pipe (not shown) through which the cooling fluid flows is closely provided to the V-phase connecting conductor 124V, and the V-phase connecting conductor 124V is cooled by the cooling fluid.

  V-phase output conductor 123V extends in the arranging direction of V-phase arms V1 to V4 and extends parallel to U-phase output conductor 123U, and the output terminal 125V of V-phase output conductor 123V is an extension of V-phase output conductor 123V It is provided at one end of the direction.

  The two switching elements 122 of each of the U-phase arms U1 to U4 and the V-phase arms V1 to V4 may be integrally modularized as a so-called 2 in 1 module. In this case, since the two switching elements 122 are connected in series inside the module, the bridge conductors 127U and 127V are omitted.

  In power supply apparatus 100 configured as described above, switching elements 122A1 to 122A4 of U-phase arms U1 to U4 and switching elements 122D1 to 122D4 of V-phase arms V1 to V4 are synchronously turned on. In addition, switching elements 122B1 to 122B4 of U-phase arms U1 to U4 and switching elements 122C1 to 122C4 of V-phase arms V1 to V4 are synchronously turned on.

  For example, when switching elements 122A1 to 122A4 of U-phase arms U1 to U4 and switching elements 122D1 to 122D4 of V-phase arms V1 to V4 are turned on, current is output from switching elements 122A1 to 122A4, respectively. The output current of the current flows through the common U-phase connection conductor 124U to the load, and returns from the load to the switching elements 122D1 to 122D4 through the common V-phase connection conductor 124V. As described above, since currents flowing in the plurality of arms pass through the common connection conductor for each of the U phase and the V phase, a plurality of systems of inverse transformation circuits are connected to a pair of output conductors by a different pair of connection conductors for each system. The variations in the current of the multiple arms due to the difference in the connection position when connected to each other are suppressed, and there is no need to extend the distance between the pair of connection conductors according to the connection position, so the configuration of the power supply apparatus is simplified. You can In addition, since the plurality of arms are connected to the output conductor via the common connection conductor for each of the U phase and the V phase, the number of parts can be reduced, and the configuration of the power supply apparatus 100 can be simplified.

  Also, in the case where the inverse conversion circuit is divided into a plurality of systems and one inverse conversion circuit is configured by one U-phase arm and one V-phase arm, for example, one switching element of one U-phase arm is When the other switching element is turned on, a short circuit occurs in one U-phase arm, and an excessive short circuit current flows in the other switching element, and the other switching element is also chained. May be destroyed. On the other hand, in the power supply apparatus 100, since the U-phase arms U1 to U4 are connected to the common connection conductor 124U, for example, even if one switching element 122A1 of the U-phase arm U1 is broken and is shorted, When the other switching element 122B1 of U-phase arm U1 is turned on, switching element 122B1 and switching elements 122B2 to 122B4 of other U-phase arms U2 to U4 which are turned on in synchronization with switching element 122B1. Short circuit current can be shared, resistance to short circuit current can be enhanced, and chained destruction of the switching element can be suppressed.

  Further, U-phase arms U1 to U4 are arranged side by side in a line, and U-phase connection conductor 124U connected to the series connection point of two switching elements 122 of each of U-phase arms U1 to U4 is formed wide. . Similarly, V-phase connection conductor 124V, in which V-phase arms V1 to V4 are arranged in line and connected to the series connection point of two switching elements 122 of V-phase arms V1 to V4, respectively, is also formed wide. Be done. Thereby, the inductance of the pair of connection conductors 124U and 124V can be reduced, and the loss due to the pair of connection conductors 124U and 124V can also be reduced.

  Further, U-phase arms U1 to U4 are arranged side by side in a row, and a copper plate 126U as a radiator is provided to straddle U-phase arms U1 to U4, and one copper plate 126U The two switching elements 122 can be cooled. Similarly, V-phase arms V1 to V4 are arranged side by side in a line, and a copper plate 126V as a radiator is provided across V-phase arms V1 to V4, and one copper plate 126V separates V-phase arms V1 to V4. The two switching elements 122 can be cooled. Thereby, the number of parts can be reduced as compared with the case where a radiator is provided for each of U-phase arms U1 to U4 and V-phase arms V1 to V4. Then, the U-phase arms U1 to U4 are cooled by one copper plate 126U, and the V-phase arms V1 to V4 are cooled by one copper plate 126V, thereby providing pipes through which the coolant for cooling the copper plates 126U and 126V flows. And, the arrangement of the hose for supplying the coolant to the pipe can be simplified and the configuration of the power supply device 100 can be simplified.

  When U-phase arms U1 to U4 are connected to different U-phase connection conductors for each arm, pipes through which the coolant flows are provided for each connection conductor, but U-phase arms U1 to U4 are common U The connection to the phase connection conductor 124U makes it possible to simplify the installation of a pipe through which the coolant for cooling the U-phase connection conductor flows and the routing of the hose for supplying the coolant to the pipe. Similarly, since the V-phase arms V1 to V4 are connected to the common V-phase connection conductor 124V, the installation of a pipe through which the cooling fluid for cooling the V-phase connection conductor flows, and the cooling fluid is supplied to the pipes You can simplify the handling of the hose. Thus, the configuration of the power supply device 100 can be simplified.

  As shown in FIG. 6, a current transformer 128 may be provided on the fourth side E4 of the U-phase connecting conductor 124U to detect the current flowing through the U-phase connecting conductor 124U. As described above, the U-phase connection conductor 124U is formed wide, and the attachment portion 129 of the current transformer 128 can be easily formed on the fourth side E4 of the U-phase connection conductor 124U. If the current transformer 128 is of a clamp type, the mounting portion 129 can be configured by a hole. Further, when the current transformer 128 is a ring type, the mounting portion 129 is a notch and a conductor which is detachably bridged over both ends of the opening of the notch and which is inserted into the ring type current transformer 128 And can be configured. The attachment portion 129 can also be provided on the third side E3 of the U-phase connection conductor 124U. Although illustration is omitted, a current transformer can be similarly provided on the third side E3 or the fourth side E4 of the V-phase connecting conductor 124V.

  FIG. 7 shows another configuration example of the inverse conversion circuit 120.

  In the example shown in FIG. 7, the notch 130 is provided on the third side E3 of the U-phase connecting conductor 124U, and the notch 130 is provided on the third side E3 of the V-phase connecting conductor 124V.

  The third side E3 of the U-phase connecting conductor 124U is located on the side of the output terminal 125U of the U-phase output conductor 123U, and the notch 130 provided on the third side E3 faces the third side E3. It extends to the four sides E4. In this example, the notch 130 also extends to the second side E2 of the U-phase connecting conductor 124U connected to the U-phase output conductor 123U, in other words, the second side E2 is the facing first side E1. The shorter side is biased to the opposite side to the output terminal 125U side with respect to the first side E1. Then, the notch 130 passes through the perpendicular bisector CL of the first side E1, that is, the middle point of the first side E1, and a line perpendicular to the first side E1 intersects the side edge of the U-phase output conductor 123U. Extending to the perpendicular bisector CL of the first side E1. The notch 130 provided on the third side E3 of the V-phase connecting conductor 124V is configured in the same manner.

  FIG. 8 schematically shows the current flowing through the U-phase connecting conductor 124U of the inverse conversion circuit of FIG. 7, and FIG. 9 shows the case where the notch 130 is omitted from the U-phase connecting conductor 124U of the inverse conversion circuit of FIG. The current flowing through the U-phase connecting conductor 124U of FIG.

  First, U-phase arms U1 to U4 are arranged in the order of U-phase arm U1, U-phase arm U2, U-phase arm U3 and U-phase arm U4 from the output terminal 125U side of U-phase output conductor 123U. Is connected to the first side E1 of Then, assuming that current flows from each of U-phase arms U1 to U4 to the load, the current output from each of U-phase arms U1 to U4 basically passes the shortest path to output terminal 125U, and U-phase connection conductor 124U It gathers at the end by the side of the output terminal 125U of the edge along the 2nd side E2 of.

  As shown in FIG. 9, when the notch 130 is omitted, the current output from each of the U-phase arms U1 to U4 is applied to the terminals t1 to t4 and the second side E2 of each of the U-phase arms U1 to U4. It flows along line segments L1b to L4b connecting the ends along the output terminal 125U side of the edge, and the lengths of these line segments L1b to L4b become L1b <L2b <L3b <L4b.

  On the other hand, as shown in FIG. 8, when the notch 130 is provided, the current output from each of the U-phase arms U1 to U4 has the terminals t1 to t4 of the U-phase arms U1 to U4 and the second side. Flows along line segments L1a to L4a connecting the end on the output terminal 125U side of the edge along E2, and the lengths of these line segments L1a to L4a are as compared with the line segments L1b and L4b shown in FIG. L1b <L1a to L4a <L4b, and the maximum value of the differences in lengths of the line segments L1a to L4a is smaller than the maximum value of the differences in lengths of the line segments L1b to L4b illustrated in FIG. In particular, when the notch 130 extends to the perpendicular bisector CL of the first side E1, L2a = L3a <L1a = L4a, and the maximum value of the differences in lengths of the line segments L1a to L4a is the smallest. Become.

  Thus, by providing the notch 130, the maximum value of the difference in length of the line segments L1 to L4, which is the path length of the current flowing in each of the U-phase arms U1 to U4, can be reduced. Thereby, the inductance and resistance of the current path of each of U-phase arms U1 to U4 can be made uniform, and the current variation of U-phase arms U1 to U4 can be further suppressed. The notch 130 may extend from the third side E3 to the fourth side E4 of the U-phase connecting conductor 124U, and may be provided apart from the second side E2.

  As described above, the power supply device disclosed in the present specification is a power supply device that converts direct current power into alternating current power having multiple phase outputs and outputs the output conductor for each output phase; A plurality of arms each including two switching elements connected in series, and a connection conductor connecting a series connection point of the two switching elements of each of the plurality of arms to the output conductor.

  Further, in the power supply device disclosed in the present specification, the plurality of arms are arranged side by side in an example, and the connection conductor is a plate having a first side extending in the direction in which the plurality of arms are arranged. The series connection point of each of the plurality of arms is connected to the first side.

  Further, in the power supply device disclosed in the present specification, the output conductor extends in the alignment direction of the plurality of arms, and has an output terminal at one end in the extension direction, and the connection conductor is A second side facing one side and connected to the output conductor, a third side connecting one end of each of the first side and the second side located on the output terminal side, and the output terminal And a fourth side connecting one end of each of the first side and the second side located on the opposite side to the side, and the third side is provided with a notch extending toward the fourth side It is done.

  Further, in the power supply device disclosed in the present specification, the notch extends to a vertical bisector of the first side.

  Further, in the power supply device disclosed in the present specification, a current transformer that detects a current flowing in the connection conductor is provided on the third side or the fourth side.

  Further, the power supply device disclosed in the present specification includes a radiator provided across the plurality of arms for each output phase.

100 power supply 110 forward conversion circuit 120 reverse conversion circuit 121 input terminal 122 switching element 123 U U phase output conductor 123 V V phase output conductor 124 U U phase connection conductor 124 V V phase connection conductor 125 U output terminal 125 V output terminal 126 U copper plate (heat sink)
126V copper plate (heat sink)
127 U Bridge conductor 127 V Bridge conductor 128 Current transformer 129 Mounting portion C Capacitor CL Vertical bisector E1 First side E2 Second side E3 Third side E4 Fourth side Q Switching elements U1 to U4 U phase arm V1 to V4 V phase arm

Claims (6)

A power supply device that converts DC power into AC power having multiple phase outputs and outputs the AC power,
For each output phase,
An output conductor,
A plurality of arms each including two switching elements connected in series;
A connecting conductor connecting a series connection point of the two switching elements of each of the plurality of arms to the output conductor;
Power supply device. The power supply device according to claim 1, wherein
The plurality of arms are arranged side by side in an example,
The power supply device, wherein the connection conductor is formed in a plate shape having a first side extending in the arranging direction of the plurality of arms, and the series connection point of each of the plurality of arms is connected to the first side. The power supply device according to claim 2,
The output conductor extends in the arranging direction of the plurality of arms, and has an output terminal at one end in the extending direction,
The connection conductor is a side facing the first side, and connects a second side connected to the output conductor and one end of each of the first side and the second side located on the output terminal side. Three sides and a fourth side connecting one end of each of the first side and the second side located opposite to the output terminal side,
The power supply device according to claim 1, wherein the third side is provided with a notch extending toward the fourth side. The power supply device according to claim 3, wherein
The power supply device, wherein the notch extends to a perpendicular bisector of the first side. The power supply device according to claim 3 or 4, wherein
The power supply device according to any one of the preceding claims, further comprising: a current transformer configured to detect a current flowing through the connection conductor on the third side or the fourth side. The power supply device according to any one of claims 2 to 5, wherein
The power supply device which has a radiator provided over the plurality of arms for each output phase.

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