Inverter and power supply device

Abstract

An object of the present invention is to provide an inverter with a simplified structure and a power supply device incorporating the same. 【Solution means】 A magnetic core, an input coil provided on the outer peripheral side of the magnetic core, an output coil provided on the outer peripheral side of the magnetic core where the input coil is provided, and switching means for switching whether or not an input voltage is applied to the input coil. The switching means periodically changes the magnetic field around the magnetic core by continuous switching to generate an AC voltage for output in the output coil.

Description

Technical Field

[0001] The present invention relates to an inverter and a power supply device.

Background Art

[0002] Various inverters for converting direct current to alternating current are known. For example, an inverter including a switching device for converting an input direct current voltage, a transformer for converting the alternating current voltage from the switching device, and a control device for controlling the on / off of a switching element is known (see, for example, Patent Document 1).

[0003] Since the inverter of the above document directly converts a direct current voltage into an alternating current voltage by switching the on / off of a plurality of switching elements, a bridge circuit including four switching elements is required, and a control device for controlling the switching elements with high precision is also required, resulting in a complicated structure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide an inverter with a simplified structure and a power supply device equipped with the same.

Means for Solving the Problems

[0006] To solve the above problems, the inverter of the present invention includes a magnetic core, an input coil provided on the outer peripheral side of the magnetic core, an output coil provided on the outer peripheral side of the magnetic core where the input coil is provided, and switching means for switching whether or not to apply an input voltage to the input coil. The switching means is characterized by periodically changing the magnetic field around the magnetic core by continuous switching to generate an AC voltage for output in the output coil.

[0007] A plurality of input coils may be provided, and the plurality of input coils are provided on the outer peripheral surface side of the same magnetic core such that the magnetic fields generated during energization are different from each other. The switching means may be configured to switch the input coil to which a voltage is applied to be in an energized state.

[0008] The output coil provided on the outer peripheral surface side of the same magnetic core may be provided on the outer peripheral side of a plurality of input coils. so as to collectively cover

[0009] The switching means may be a switching device that performs mechanical switching by a switch.

[0010] ​The switching device has the switch and the switching shaft. The switch has a switching arm that is swingably supported and composed of a conductor to which a DC voltage is applied, and a contact member that is electrically connected to the input coil and contacts the switching arm. The switching arm maintains contact with the contact member by at least one of its own weight or a biasing member that biases the switching arm toward the contact member side. The switching shaft is supported so as to be rotatable or pivotable about its own axis in a posture directed along the swing axis of the switching arm. On the outer peripheral surface side of the switching shaft, a protrusion that protrudes radially outward is integrally formed in a view from its axial direction. As the switching shaft rotates or pivots, a contact state in which the protrusion abuts against the switching arm and a non-contact state in which they do not abut are switched. The switch may be configured such that in the non-contact state, the switching arm and the contact member come into contact and are electrically connected to enter an on state, while in the contact state, the switching arm is swung toward the side away from the contact member, and the switching arm and the contact member become non-contact and the electrical connection between them is released to enter an off state.

[0011] The protrusions may be provided at a plurality of different circumferential positions on the outer peripheral surface of the switching shaft, the plurality of protrusions may be respectively arranged at different positions in the axial direction of the switching shaft, and one or a plurality of switching arms may be provided for each of the plurality of protrusions.

[0012] On the other hand, the power supply device of the present invention includes the inverter and a DC power supply that supplies power to the switching means. The DC power supply has a generator that generates electricity by the rotation of a rotor, a transformer that transforms the generated AC voltage, and a converter that converts the transformed AC voltage.

[0013] The transformer has a magnetic core, a primary coil and a secondary coil provided on the outer periphery of the magnetic core. The primary coil is configured to generate an alternating voltage by a change in the magnetic field due to the rotation of the rotor, and the secondary coil may be configured to transform the alternating voltage generated in the primary coil and output it to the converter.

Advantages of the Invention

[0014] According to the present invention, by continuously switching the input coil by the switching means, an alternating voltage is generated in the output coil, so that a control device and a bridge circuit for performing high-precision control are not required, and the structure is simplified.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0016] FIG. 1 is an explanatory diagram conceptually explaining the structure of a DC power supply, and FIG. 2 is an explanatory diagram conceptually explaining the structure of a generator mounted on the DC power supply. The power supply device to which the present invention is applied includes a DC power supply 1 that outputs a DC voltage, and an inverter (see FIGS. 3 to 6) that converts the DC voltage output from the DC power supply 1 into an AC voltage.

[0017] The DC power supply 1 includes a generator 3 that generates an AC voltage, a transformer 4 that transforms the AC voltage generated by the generator 3, and a converter 6 that converts the AC voltage transformed by the transformer 4 into a DC voltage.

[0018] The above-mentioned generator 3 has a rotor shaft 7, a pair of bearings 8 and 9 that rotatably support the rotor shaft 7 around its axis, a rotor 11 that is externally mounted and fixed to the rotor shaft 7 and is composed of a disk-shaped permanent magnet, an iron core (magnetic core) 12 disposed in a space where the magnetic field changes as the rotor 11 rotates, and a primary coil 13 wound around the outer peripheral side of the iron core 12.

[0019] The rotor shaft 7 is rotationally driven by a driving device 14. Also, the rotation speed (rotational speed) and rotation direction of the rotor shaft 7 are detected by a rotation sensor 16 including an encoder or the like.

[0020] The driving device 14 has a transmission pulley 17 mounted on the outer periphery of the rotor shaft 7 and rotating integrally with the rotor shaft 7, a transmission shaft 18 rotatably supported in a state parallel to the rotor shaft 7, a transmission pulley 19 mounted on the outer periphery of the transmission shaft 18 and rotating integrally with the transmission shaft 18 adjacent to the transmission pulley 17, a transmission belt 21 wound around between the two transmission pulleys 17 and 19, a transmission gear 22 externally mounted and fixed to the transmission shaft 18 and rotating integrally with the transmission shaft 18, and a motor 23 such as an electric type which is an actuator.

[0021] The position and posture of the motor 23 are set so that the motor shaft 23a from which the rotational power of the motor 23 is output is parallel to the transmission shaft 18. A motor-side gear 24 externally mounted and fixed to the motor shaft 23a is constantly meshed with the above-mentioned transmission gear 22.

[0022] The motor 23 is controlled in its rotation by the control device 25, and its rotational power is transmitted to the rotor shaft 7 via the transmission belt 21 to rotate the rotor 11. Since the rotational state of the rotor 11 is fed back to the control device 25 by the rotation sensor 16, the rotational state of the rotor 11 (specifically, the rotational speed and the rotational direction) is controlled by the control device 25 in a state appropriate for power generation.

[0023] The rotor shaft 7 is inserted through the center of the rotor 11 in a perpendicular or substantially perpendicular state, and rotates integrally with the rotor shaft 7. One or a plurality of notch-shaped portions 26 are recessed in the outer peripheral surface of the rotor 11. In this example, three notch-shaped portions 11a are provided evenly at predetermined intervals (specifically, every 1 / 3 turn). Each notch-shaped portion 26 has an inclined surface 26a that inclines radially inward toward one side in the rotational direction of the rotor 11, and a standing surface 26b that rises radially outward from the end on the deepest notched side of the inclined surface 26a, and the whole is formed in a wedge shape when viewed in the axial direction of the rotor shaft 7.

[0024] The iron core 12 integrally has a pair of leg portions 27, 27 and a main body portion 28 that connects one end side of the pair of leg portions 27, 27 to each other and to which the primary coil 13 is attached on the outer peripheral side thereof, and the whole is formed in a U shape. Recesses 29, 29 for accommodating a part of the portion near the outer periphery of the rotor 11 are formed at the ends of the leg portions 27, 27 on the side far from the main body portion 28.

[0025] The recess 29 has an arc surface 29a along the outer peripheral surface of the rotor 11 and a facing surface 29b that opposes one end surface in the axial direction of the rotor 11. The recess 29 receives the change in the magnetic field due to the rotation of the rotor 11 with these two surfaces 29a, 29b.

[0026] An alternating current is generated in the primary coil 13 attached to the outer peripheral side of the iron core 12 due to the change in the magnetic field caused by the rotation of the rotor 11. An electric resistance 31 composed of an internal resistance such as a conducting wire or a separately provided resistor is provided in the closed circuit including the primary coil 13.

[0027] The above transformer 4 has a primary coil 13 and a secondary coil 32 wound around the outer peripheral side of the iron core 12 (more specifically, the outer peripheral surface of the primary coil 13). The secondary coil 32 is configured to output the transformed AC voltage to the above-mentioned converter 6 between the primary coil 13 and itself.

[0028] The above converter 6 has conversion means (not shown) such as a rectifier bridge circuit that converts AC to DC by rectification, and a pair of output ports 6a and 6b that output the DC voltage after conversion. One output port 6a is an applied port to which the DC voltage after conversion is applied, and the other output port 6b is a grounded port that is grounded.

[0029] Incidentally, each of these two coils 13 and 32 is constituted by winding a conducting wire with an insulator coated on the entire outer peripheral surface of a linear conductor around the outer peripheral surface side of the iron core 12.

[0030] The DC power supply 1 configured as described above can efficiently generate power while suppressing the output from the motor 23 to a low output by appropriately controlling the rotational speed of the rotor shaft 7 (rotor 11) based on the sensing result by the rotation sensor 16 in the low speed region. Also, by setting the transformer 4, it becomes possible to appropriately adjust the optimum voltage.

[0031] Regarding the rotor 11, since high-precision rotation control is not required, power generation can also be performed by the operator manually rotating the rotor 11 if an appropriate gear ratio is set.

[0032] Also, a movable mechanism (not shown) that supports the iron core 12 so as to be movable in the direction of separating from and approaching the rotor 11 may be provided. And when the force required to rotate the rotor 11 becomes excessive due to an increase in the rotational speed or the like, the two coils 13 and 32 and the iron core 12 may be separated from the rotor 11 by the movable mechanism.

[0033] FIG. 3 is an explanatory diagram conceptually explaining the configuration of the main part of the inverter. The main part of the inverter includes a single cylindrical iron core (magnetic core) 34, a plurality of input coils 36, 37 provided on the outer peripheral side of the iron core 34, an output coil 38 provided on the outer peripheral side of the iron core 34, a switching device (switching means) 39 that switches whether to apply the DC voltage output from the application port 6a of the DC power supply 1 to the input coils 36, 37 and that applies the DC voltage to put the input coils 36, 37 in an energized state.

[0034] The plurality of input coils 36, 37 are provided on the outer peripheral surface side of the same iron core 34 such that the magnetic fields generated during energization are different from each other.

[0035] In this example, two conducting wires with an insulator coated on the entire outer peripheral surface of a linear conductor are arranged adjacent to each other in the axial direction of the iron core 34 and are wound around the outer peripheral surface side of the iron core 34 in the same winding direction (specifically, the same number of turns) from one end to the other end in the axial direction, thereby constituting these two input coils 36, 37.

[0036] Also, the input sides and output sides of the respective input coils 36, 37 are distributed and arranged on both sides in the axial direction of the iron core 34, but the input sides of the two input coils 36, 37 and the output sides of the two input coils 36, 37 are arranged on opposite sides in the axial direction of the iron core 34.

[0037] Also, the end portions 36a, 37a on the input sides of the respective input coils 36, 37 are electrically connected to a pair of connection terminals 41, 42, which will be described later, on the switching device 39 side, and the end portions 36b, 37b on the output sides thereof are grounded via resistors 43, 44. Incidentally, the resistors 43, 44 are composed of the internal resistance of the conducting wires constituting the input coils 36, 37 or resistors provided separately.

[0038] According to such a wiring configuration, when a DC voltage is applied to one input coil 36 to make it energized, the direction of the magnetic field generated is opposite to that when a DC voltage is applied to the other input coil 37 to make it energized in the axial direction of the iron core 34, and the magnetic field changes (reverses). The switching device 39 is configured to switch the input coils 36 and 37 that are electrically connected to the application port 6a to be energized and to switch the electrical connection between the input coils 36 and 37 and the application port 6a by mechanical on / off switching described later.

[0039] The output coil 38 is configured by spirally winding a conducting wire with an insulator coated on the entire outer peripheral surface of a linear conductor around the outer peripheral side of the iron core 34 (specifically, around the outer peripheries of the two input coils 36 and 37). A voltage is generated in this output coil 38 due to the change in the magnetic field caused by switching the energization of one or a plurality (two in this example) of the input coils 36 and 37 or by switching the input coils 36 and 37 to be energized. This voltage is taken out from the output ports 38a and 38b at both ends of the output coil 38.

[0040] Incidentally, if the switching device 39 performs continuous and periodic switching, the voltage taken out from the pair of output ports 38a and 38b becomes an AC voltage with periodicity.

[0041] In this example, the directions of the input and output of the input coils 36 and 37 are reversed to make the magnetic fields different when they are energized. However, the directions of the input and output may be the same and the number of turns may be different to make the magnetic fields different when they are energized, or the magnetic fields may be made different by making both the directions of the input and output and the number of turns different.

[0042] Furthermore, it is not essential to provide a plurality of input coils 36 and 37. The magnetic field around the iron core 34 may be changed only by switching the presence or absence of energization of a single input coil provided on the outer peripheral side of the iron core 34.

[0043] Figures 4 and 5 are a plan view and a side view showing the configuration of a switching device mounted on an inverter. The switching device 39 includes a horizontal rectangular thick plate-shaped base 47 that is long in the left-right direction, a pair of support portions 48 and 49 formed in a block shape that protrude upward from the upper surface side of the base 47 and extend in the entire length direction of the base 47, a pair of leg portions 50 and 50 formed in a block shape that protrude downward from the lower surface side of the base 47 and extend in the entire length direction of the base 47, a metal support frame 51 having an L-shaped cross section and formed in the horizontal direction (in the illustrated example, the left-right direction), a current-carrying member 52 that is a metal conductor to which the application port 6a is electrically connected and is a linear rod-shaped member, a plurality of switches 53 and 54 that are turned on and off, and a single switching shaft 55 that turns on and off the switches 53 and 54.

[0044] The pair of support portions 48 and 49 are fixed to portions near both ends in the width direction on the upper surface of the base 47 in a plan view. The upper end surfaces of the support portions 48 and 49 are formed on the same horizontal or substantially horizontal plane. The pair of leg portions 50 and 50 are fixed to portions near both ends in the width direction on the lower surface of the base 47 in a bottom view, and by grounding these two leg portions 50 and 50, the switching device 39 is installed in a positioned state.

[0045] The support frame 51 is attached and fixed to the support portion 48 by fixing tools such as a plurality of screws and bolts arranged in its longitudinal direction, with the horizontal portion 51a, which is an angled one-sided portion, in surface contact with the upper end surface of the support portion 48 on one side in the front-rear direction (the rear side in the illustrated example) and the upright portion 51b, which is the other one-sided portion, protruding upward from the upper end surface of the support portion 48. The support frame 51 is disposed at an inner position in the width direction on the upper end surface of the support portion 48, with the sides of the pair of support portions 48 and 49 that approach each other defined as the "inner side in the width direction".

[0046] A single rod-shaped current-carrying member 52 is attached and fixed to the upper end portion of the upright portion 51b of the support frame 51 by spot welding or the like in a state where its axial direction is oriented in the left-right direction, which is the entire length direction of the support frame 51, over most or the entire length direction thereof.

[0047] In the range from the upper surface side of the horizontal portion 51a of the support frame 51 to the upper end surface side of the support portion 49, the above-described switches 53 and 54 are provided. A plurality of these switches 53 and 54 are arranged side by side at predetermined intervals in the entire length direction of the support frame 51.

[0048] The switches 53 and 54 are provided individually for each of the plurality of input coils 36 and 37. A plurality (two in the illustrated example) of the switches 53 and 54 are arranged side by side in the left - right direction which is the entire length direction of the support frame 51. Each of the switches 53 and 54 includes a plurality of switching arms 57 which are supported by a hinge 56 so as to be vertically swingable on one support portion 48 side (specifically, on the horizontal portion 51a side of the support frame 51) and are made of a metal conductor, and single contact members 58 and 59 which are provided on the upper end surface side of the other support portion 49 and are formed in a direction - plate shape.

[0049] The hinge 56 has a pair of blades 56a and 56b and a shaft (swing shaft) 56c that rotatably connects the pair of blades 56a and 56b in directions of separating from and approaching each other. One blade 56a of this hinge 56 is attached and fixed to the horizontal portion 51a of the support frame 51 by a fixture such as a screw or a bolt, and an end portion of one (the rear side in the illustrated example) in the longitudinal direction of the switching arm 57 is attached and fixed to the other blade 56b.

[0050] The switching arm 57 is formed in a rectangular plate shape having a thickness in the vertical swing direction with the shaft 56c as a fulcrum, and its longitudinal direction is directed in the direction from one of the pair of support portions 48 and 49 to the other in a plan view (that is, the front - rear direction). Correspondingly, the shaft 56c of the hinge 56 also has its axial direction directed in the direction parallel to the longitudinal direction of the support portions 48 and 49 (that is, the left - right direction). Incidentally, a part of the blade 56a of the hinge 56 protrudes inward in the width direction from the support frame 51 and the support portion 48 on which it is provided in a plan view.

[0051] This switching arm 57 is electrically connected to the energizing member 52 (i.e., the application port 6a) via the connection wire 61. The connection wire 61 is provided with an elastically deformable coil portion 61a. The situation where the electrical connection between the switching arm 57 and the energizing member 52 by the connection wire 61 is cut off by the vertical swing of the switching arm 57 is efficiently prevented by the elastic deformation of the coil portion 61a.

[0052] Incidentally, the hinge 56 is provided individually for each switching arm 57. The shafts 56c that serve as the individual swing fulcrums of the plurality (five in this example) of switching arms 57 provided on one switch 53 and the shafts 56c that serve as the individual swing fulcrums of the plurality (five in this example) of switching arms 57 provided on the other switch 54 are all arranged on the same axis, and the axial direction thereof is directed in a direction along both the longitudinal direction of the support frame 51 and the supports 48 and 49 and the above-described switching shaft 55 (specifically, a direction parallel to both).

[0053] The plurality of switching arms 57 provided on one of the switches 53 and 54 are arranged side by side at equal intervals in the axial direction of the shaft 56c.

[0054] The contact members 58 and 59 are provided individually for each of the plurality of input coils 36 and 37 and are arranged side by side in a direction parallel to the switching shaft 55. Each of the contact members 58 and 59 is attached and fixed to a portion closer to the inner side in the width direction on the upper end face side of the support 49 by a fixture such as a screw or a bolt.

[0055] Between the contact members 58 and 59 and the upper end face of the support 49, square insulating sheets 62 and 63 that can be elastically changed are interposed. This insulating sheet 62 is attached and fixed to the upper end side of the support 49 together with the contact members 58 and 59 by a fixture.

[0056] In this example, the contact member 58 provided for one input coil 36 is electrically connected to the end portion 36a of the input coil 36 via the above-described connection terminal 41 integrally provided therewith, and the contact member 59 provided for the other input coil 37 is electrically connected to the end portion 37a of the input coil 37 via the above-described connection terminal 42 integrally provided therewith.

[0057] The switches 53 and 54 configured in this way perform a switching to an on state in which the DC power supply 1 is electrically connected to the corresponding input coils 36 and 37 by swinging the switching arm 57 downward (in the on direction) and bringing it into planar contact (contact) with the corresponding contact members 58 and 59. In the on state, the switching arm 57 is switched to a horizontal posture in the front-rear direction, and further swinging in the on direction is restricted (specifically prohibited) by contact with the contact members 58 and 59. The swinging position of the switching arm 57 in this state is hereinafter referred to as the "on position".

[0058] On the other hand, the switches 53 and 54 perform a switching to an off state in which the electrical connection between the DC power supply 1 and the corresponding input coils 36 and 37 is disconnected by swinging the switching arm 57 upward (in the off direction), which is the direction opposite to the on direction, from the on position to release the contact with the corresponding contact members 58 and 59.

[0059] The planar contact between the switching arm 57 and the contact members 58 and 59 is stably maintained by the elastic deformation of the insulating sheets 62 and 63. Further, each switching arm 57 is stably maintained in contact with the contact members 58 and 59 by at least one (both in this example) of its own weight and a biasing member (not shown) that elastically biases it in the on direction, which is the contact member side.

[0060] Incidentally, if any one of the plurality of switching arms 57 provided on the switches 53 and 54 comes into contact with the contact members 58 and 59, the switches 53 and 54 are turned on. Therefore, even if a contact failure with the contact members 58 and 59 occurs in a part of the plurality of switching arms 57, the function can be maintained by the remaining switching arms 57. In addition, the influence of the internal resistance can be reduced by the plurality of switching arms 57 arranged in parallel electrically.

[0061] Figs. 6(A) and 6(B) are side views showing the on / off states of the switches of the switching device. As shown in Figs. 4 to 6, the switching shaft 55 is supported rotatably about its axis by a pair of support members 67, 67 arranged on both sides in the axial direction thereof in a posture directed in the direction along the above-described shaft 56c (specifically, a parallel direction).

[0062] Each support member 67 integrally has a ring portion 68 forming a circular ring shape and a shaft portion 69 protruding linearly downward from the lower end side of the ring portion 68. A male screw 69a is formed on the outer peripheral side of the shaft portion 69.

[0063] The base 47 is provided with an insertion hole 47a through which the shaft portion 69 is inserted. Nuts 71 and 72 having female screws 71a and 72a capable of being screwed with the male screw 69a are formed on the inner peripheral sides thereof on both the upper and lower surfaces of the base 47. The two nuts 71 and 72 are attached and fixed to the base 47 with the centers of their inner peripheral surfaces aligned with the center of the insertion hole 47a.

[0064] That is, each support member 67 is detachably fixed to the base 47 side by the nuts 71 and 72 in a state where the vertical position in the axial direction of the shaft portion 69 can be adjusted.

[0065] A pair of support members 67, 67 support the switching shaft 55 in a horizontal posture (specifically, a horizontal or substantially horizontal state) with the switching shaft 55 inserted through the ring portions 68, 68 in its axial direction, and are rotatable or pivotable about its axis. Note that the ring portions 68 of each support member 67 may be replaced with bearings to support the switching shaft 55 more smoothly for rotation.

[0066] The switching shaft 55 supported in this way is disposed in the vicinity directly below the lower side on the insertion direction side in the switching arm 57 swung to the insertion position. On the outer peripheral surface side of this switching shaft 55, protrusions 73, 74 protruding radially outward are integrally formed in a view along its axial direction.

[0067] These protrusions 73, 74 are provided one by one for each of the plurality of switches 53, 54. These protrusions 73, 74 are arranged at predetermined intervals (in this example, every half turn) at different positions in the circumferential direction (axial direction of the outer peripheral surface) of the switching shaft 55, and the axial positions of the switching shaft 55 where they are provided are also different from each other.

[0068] To explain in more detail, the protrusion 73 has a large-diameter round bar 73a made of iron that forms a straight line parallel or substantially parallel to the axial direction of the switching shaft 55 and is welded and fixed to the outer peripheral surface of the switching shaft 55, and a small-diameter round bar 73b made of iron that forms a straight line parallel or substantially parallel to the axial direction of the switching shaft 55 and is welded and fixed to the outer peripheral surfaces of both the switching shaft 55 and the round bar 73a. The round bar 73a has a smaller diameter than the switching shaft 55, and the round bar 73b has an even smaller diameter than the round bar 73a. The small-diameter round bar 73b improves the mounting strength of the large-diameter round bar 73a to the switching shaft 55. The protrusion 74 is similarly composed of round bars 74a, 74b.

[0069] In addition, the protrusion 73 provided corresponding to one switch 53 is formed in an axial range that can contact all the switching arms 57 of the switch 53 and is always non - contacting with all the switching arms 57 of the other switch 54. Similarly, the protrusion 74 provided corresponding to the other switch 54 is also formed in an axial range that can contact all the switching arms 57 of the switch 54 and is always non - contacting with all the switching arms 57 of the one switch 53.

[0070] With respect to the switching arm 57, the switching shaft 55 is configured such that, as it rotates or pivots, the contact state (see FIG. 6(B)) where the above - mentioned protrusions 73 and 74 are in contact and the non - contact state (see FIG. 6(A)) where they are not in contact are switched. When the switching arm 57 is switched to the non - selected state, its rocking position is held at the input position by one or both of its own weight or the biasing force from the biasing member, and it enters the input state. On the other hand, when it is switched to the contact state, it resists its own weight or the biasing force from the biasing member and rocks in the cutting direction from the input position to enter the cutting state.

[0071] That is, the on - off timings of the switches 53 and 54 corresponding to the protrusions 73 and 74 can be set by the positions where the protrusions 73 and 74 are provided in the circumferential direction of the switching shaft 55.

[0072] During the rotation of the switching shaft 55 in one direction, starting from the state (state A) where both switches 53 and 54 are in the cutting state, it transitions to the state (state B) where one switch 53 is in the input state and the other switch 54 is in the cutting state, then continues to transition to the state (state C) where both switches 53 and 54 are in the cutting state, and finally transitions to the state (state D) where one switch 53 is in the cutting state and the other switch 54 is in the input state. After that, it returns to state A again, and hereinafter, this cycle is repeated.

[0073] By simply continuously performing the simple operation of rotating or pivoting the switching shaft 55, the switching device 39 can perform continuous and periodic switching, and it becomes possible to output an AC voltage from the pair of output ports 38a and 38b. Incidentally, by adjusting the operating speed of the switching shaft 55, it is also possible to appropriately adjust the frequency of the output AC voltage.

[0074] Also, the switching shaft 55 may be manually rotated or pivoted around the axis. However, in the illustrated example, the rotational power from a motor 76 such as an electric motor, which is an actuator, is gear-transmitted to the switching shaft 55 to rotationally drive the switching shaft 55 in one direction or both directions.

[0075] The operations such as the rotational speed and rotational direction of the motor 76 are controlled by the above-described control device 25. Also, the rotational speed, rotational direction, etc. of the switching shaft 55 are detected by a rotation sensor 77 including an encoder, and the detection results are input to this control device 25.

[0076] According to the inverter configured as described above and the power supply device equipped with the same, the generated AC voltage can be efficiently converted with a simple configuration, and an AC voltage having a desired frequency and voltage can be obtained.

[0077] Note that the switching arms 57 constituting the switches 53 and 54 may be configured by leaf springs that are elastically bent and deformed by contact with the protrusions 73 and 74 and contact the contact members 58 and 59 when not deformed. In this case, the hinge 56 is also unnecessary, and the configuration is simplified.

Explanation of Reference Numerals

[0078] 1 DC power supply 3 Generator 4 Transformer 6 Converter 11 Rotor 12 Core (magnetic core) 13 Primary coil 32 Secondary coil 34 Core 36 Input coil 37 Input coil 38 Output coil 39 Switching device (switching means) 53 Switch 54 Switch 55 Switching shaft 56c Shaft (oscillation shaft) 57 Switching arm 58 Contact member 59 Contact member 73 Protrusion 74 Protrusion

Claims

1. A magnetic core, An input coil provided on the outer peripheral side of the magnetic core, An output coil provided on the outer peripheral side of the magnetic core where the input coil is provided, Switching means for switching the application or non-application of the input voltage to the input coil, and The switching means is configured to periodically change the magnetic field around the magnetic core by continuous switching to generate an AC voltage for output in the output coil, A plurality of input coils are provided, The plurality of input coils are provided on the outer peripheral surface side of the same magnetic core such that the magnetic fields generated during energization are different from each other, The switching means is configured to switch the input coil to which the voltage is applied to be in an energized state, The output coil is provided so as to collectively cover the outer peripheral sides of the plurality of input coils provided on the outer peripheral surface side of the same magnetic core, An inverter characterized by the above.

2. A magnetic core, An input coil provided on the outer peripheral side of the magnetic core, An output coil provided on the outer peripheral side of the magnetic core where the input coil is provided, Switching means for switching the application or non-application of the input voltage to the input coil, and The switching means is configured to periodically change the magnetic field around the magnetic core by continuous switching to generate an AC voltage for output in the output coil, The switching means is a switching device that performs mechanical switching by a switch, The switching device has the switch and a switching shaft, The switch has a switching arm composed of a conductor that is swingably supported and to which a DC voltage is applied, and a contact member that is electrically connected to the input coil and contacts the switching arm, The contact of the switching arm with the contact member is maintained by at least one of its own weight or a biasing member that biases the switching arm toward the contact member side, The switching shaft is supported so as to be rotatable or pivotable about its own axis in a posture directed along the swing axis of the switching arm, On the outer peripheral surface side of the switching shaft, a protrusion protruding radially outward is integrally formed in a view along its axial direction, As the switching shaft rotates or pivots, the contact state where the protrusion abuts against the switching arm and the non-contact state where they do not abut are switched. The switch is configured such that, in the non-contact state, the switching arm and the contact member come into contact with each other and are electrically connected in an on state, while in the contact state, the switching arm is swung to the side away from the contact member, and the switching arm and the contact member are brought into a non-contact state and the electrical connection between the two is released to be in an off state. The inverter according to the description, characterized in that.

3. The protrusions are respectively provided at a plurality of different positions in the circumferential direction on the outer peripheral surface of the switching shaft. The plurality of protrusions are respectively arranged at different positions in the axial direction of the switching shaft from each other. One or a plurality of switching arms are provided for each of the plurality of protrusions. The inverter according to claim 2.

4. An inverter according to any one of claims 1 to 3, and a DC power supply for supplying power to the switching means. The DC power supply includes a generator that generates electricity by the rotation of the rotor, a transformer that transforms the generated AC voltage, and a converter that converts the transformed AC voltage. The power supply device, characterized in that.

5. The transformer has a magnetic core, a primary coil provided on the outer periphery of the magnetic core, and a secondary coil. The primary coil is configured such that an AC voltage is generated by a change in the magnetic field due to the rotation of the rotor. The secondary coil is configured to transform the AC voltage generated in the primary coil and output it to the converter. The power supply device according to claim 4.

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