JP2019068696A - Non-contact power feeding device and electric circuit module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a wiring structure of an electric circuit. A power transmission coil 18 is fixed to a power transmission board 20, and a first power receiving coil 24a and a second power receiving coil 24b are fixed to a power receiving board 32. The power transmission coil 18 has a first loop section 18a and a second loop section 18b, and when the power transmission board 20 and the power receiving board 32 face each other, the first loop section 18a faces the first power receiving coil 24a and the second loop. The section 18b faces the second power receiving coil 24b. The power transmission side core 40 straddles the vicinity of the region inside the first loop section 18a and the vicinity of the region inside the second loop section 18b on the front side of the drawing with respect to the power transmission board 20. The power receiving side core straddles the vicinity of the inner region of the first power receiving coil 24a and the vicinity of the inner region of the second power receiving coil 24b on the inner side of the drawing with respect to the power receiving substrate 32. [Selection diagram] Fig. 2

Description

  The present invention relates to a noncontact power feeding device and an electrical circuit module, and more particularly to a structure for noncontact power feeding.

  2. Description of the Related Art There are widely used electric vehicles traveling by the driving force of a motor generator, and hybrid vehicles traveling by the driving force of a motor generator and an engine. Such an electrically powered vehicle is provided with a power control circuit that exchanges electric power with the motor generator. The electric power control circuit supplies electric power to the motor generator when the motor generator generates torque to power the electric vehicle. When the motor generator regeneratively brakes the electrically powered vehicle, the power control circuit recovers the regenerative power generated by the motor generator.

  In general, a power control circuit has a plurality of switching elements. The control unit included in the electric vehicle controls the power control circuit by performing on / off control of each switching element according to the traveling state to cause the motor generator to generate torque or cause the motor generator to perform regenerative braking.

  Patent Document 1 below describes a power card mounted on an electric vehicle. The power card contains a switching element that constitutes a power control circuit, and the power card is attached to the cooling member. From the power card, a plurality of terminals connected to peripheral devices are drawn out.

JP, 2016-54175, A JP, 2006-173415, A

  In general, a large number of switching elements are used in a power control circuit for mounting on a vehicle. The wiring connected to the switching element includes not only one for supplying power but also one for controlling the switching element. Therefore, the structure of the wiring leading to the power control circuit is complicated.

  The present invention aims to simplify the wiring structure of an electrical circuit.

  The present invention relates to a power transmission coil having a section which describes a loop shape, a power transmission board provided with the power transmission coil, a magnetic member provided on the power transmission board, and a power supply circuit for supplying power to the power transmission coil. The magnetic flux linked to the power receiving coil is generated from the power transmitting coil by the power supplied from the power supply circuit, and the magnetic member guides the magnetic flux generated from the power transmitting coil to the power receiving coil. It is characterized by

  Preferably, a control unit that performs noncontact communication between the coupling conductor provided on the power transmission substrate and juxtaposed to the power transmission coil and the power receiving circuit connected to the power receiving coil through the coupling conductor. Equipped with

  Preferably, the power transmission coil has a plurality of loop sections each drawing a loop shape, a plurality of the loop sections are arranged in series, and a direction in which a wire forming two adjacent loop sections circulates In the reverse direction, magnetic fluxes interlinking with the plurality of power receiving coils corresponding to the plurality of loop sections are generated from each of the loop sections, and the magnetic material member is configured to generate magnetic fluxes generated from the respective loop sections. It leads to the receiving coil.

  Preferably, the magnetic member is a layer of magnetic material provided on the power transmission substrate.

  Desirably, the magnetic member is provided on a plate surface of the power transmission board and on the plate surface opposite to the power receiving coil side, and is directed to a region inside a loop shape of the power transmission coil. It has a power transmission protrusion.

  The present invention is provided corresponding to each of a plurality of power receiving coils which draw a loop shape, a power receiving substrate provided with each of the power receiving coils, and a plurality of the power receiving coils, and is connected to each of the plurality of power receiving coils And a magnetic body member provided on the power reception substrate, wherein the magnetic body member guides the magnetic flux generated from the power transmission coil to each of the power reception coils.

  Desirably, it is a coupled conductor provided on the power receiving substrate, juxtaposed to each of the power receiving coils, and connected to each of the power receiving circuits, and performing non-contact communication with a control unit that controls each of the power receiving circuits. And a coupling conductor for

  Preferably, in the electric circuit module, the power transmission coil has a plurality of loop sections each drawing a loop shape, and the plurality of loop sections are arranged in a row, and the plurality of power reception coils are disposed on the power reception substrate. It arrange | positions in series, and each said loop area is facing the said receiving coil corresponding to each said loop area.

  Preferably, the magnetic member is a layer of a magnetic material provided on the power receiving substrate.

  Desirably, the magnetic member is provided on a plate surface of the power receiving substrate, the plate surface opposite to the power transmission coil side, and is directed to a region inside a loop shape of the power receiving coil. A power receiving protrusion is provided.

  According to the present invention, the wiring structure of the electric circuit can be simplified.

It is a figure showing the composition of the electric power system for vehicles mounting concerning the embodiment of the present invention. It is a figure which shows the part regarding the U-phase of the electric system for vehicle mounting. It is a figure which shows the structure of each coil notionally. It is a figure which shows the structure of a power transmission coil notionally. It is a figure which shows the structural example of a power transmission coil and a receiving coil. It is a figure which shows the structural example of a power transmission coil and a receiving coil. It is a figure which shows the state in which several power cards were mounted | worn with the cooler. It is a figure which shows a power card and a power transmission board. It is a figure which shows typically the cross section of a power card and a power transmission board. They are a bottom view of a power transmission board, and a top view of a power receiving board. It is a figure which shows the cross section of a power card and a power transmission board. It is a figure which shows typically the cross section of a power card and a power transmission board. It is a figure which shows typically the structure at the time of the power card of 3 phases being put in order. It is a figure which shows the equivalent circuit about the structure shown by FIG. It is a figure which shows the structure which magnetically coupled the power transmission side coil which has one loop area, and two receiving coils. It is a figure which shows the structure which magnetically coupled the power transmission side coil which has one loop area, and two receiving coils.

  FIG. 1 shows the configuration of a vehicle-mounted power system according to an embodiment of the present invention. The on-vehicle power system includes a control unit 10, a power supply circuit 12, a U-phase power card 14u, a V-phase power card 14v, and a W-phase power card 14w. Each power card is connected to a three-phase load circuit 16 such as a motor generator. Each power card is an electric circuit module in which an electric circuit is incorporated, and has a function of exchanging power with the load circuit 16.

  The control unit 10 controls the power supply circuit 12 and each power card. The power supply circuit 12 supplies power to each power card according to control by the control unit 10, and each power card supplies power to the load circuit 16 according to control by the control unit 10. Each power card also recovers power from the load circuit 16 under the control of the control unit 10.

  FIG. 2 schematically shows a U-phase power system as a part related to the U-phase of the on-vehicle power system. The U-phase power system includes a control unit 10, a power supply circuit 12, a power transmission coil 18, a transmission linear conductor 26a, a transmission linear conductor 26b, a power transmission substrate 20, and a U-phase power card 14u. In FIG. 2, the power transmission substrate 20 is indicated by an alternate long and short dash line in order to facilitate understanding of the configuration, and each component fixed to the power transmission substrate 20 is indicated by a solid line.

  The U-phase power card 14 u includes a first power receiving coil 24 a, a second power receiving coil 24 b, a receiving linear conductor 28 a, a receiving linear conductor 28 b, a power control circuit 30, and a power receiving substrate 32. The power control circuit 30 includes a rectification circuit 33a, a reception circuit 34a, a drive circuit 36a, and a switching element 38a. The rectifying circuit 33a, the receiving circuit 34a, and the driving circuit 36a supply the power obtained from the first power receiving coil 24a to the switching element 38a, and control the switching element 38a on and off.

  The power control circuit 30 further includes a rectification circuit 33 b, a reception circuit 34 b, a drive circuit 36 b, and a switching element 38 b. The rectifying circuit 33b, the receiving circuit 34b, and the driving circuit 36b supply the power obtained from the second power receiving coil 24b to the switching element 38b, and control the switching element 38b on and off.

  For example, IGBTs (Insulated Gate Bipolar Transistors) are used as the switching elements 38a and 38b. These switching elements may constitute a switching arm. When an IGBT is used as each switching element, in the switching arm, the emitter terminal of the switching element 38a as the upper arm and the collector terminal of the switching element 38b as the lower arm are connected. The connection point of the upper arm and the lower arm is connected to the U-phase terminal of the load circuit, and a power supply voltage is applied between the collector terminal of the upper arm and the emitter terminal of the lower arm. In the switching arm, for example, when the upper arm and the lower arm are alternately turned on and off, a current flows from the connection point of the upper arm and the lower arm to the load circuit, or a current flows from the load circuit to the connection point.

  A power transmission coil 18 is connected to the power supply circuit 12, and a first power reception coil 24 a and a second power reception coil 24 b are connected to the power control circuit 30. The power transmission coil 18 is fixed to the power transmission substrate 20, and the first power reception coil 24 a and the second power reception coil 24 b are fixed to the power reception substrate 32. The power transmission coil 18 has a first loop section 18a and a second loop section 18b, and the power transmission substrate 20 and the power reception substrate 32 face each other, so that the first loop section 18a faces the first power reception coil 24a, and the second loop The section 18 b faces the second power receiving coil 24 b.

  A power transmission side core 40 as a magnetic material member is provided in the vicinity of the inner area of each of the first loop section 18a and the second loop section 18b. The power transmission core 40 may have a U-shape connecting the vicinity of the region inside the first loop section 18a and the vicinity of the region inside the second loop section 18b. In this case, the power transmission side core 40 straddles the vicinity of the region inside the first loop section 18a and the vicinity of the region inside the second loop section 18b on the near side in the drawing with respect to the power transmission substrate 20.

  The direction of the magnetic flux generated from the first loop section 18 a and linked to the second loop section 18 b through the power transmission core 40 is the same as the direction of the magnetic flux generated from the second loop section 18 b. The conducting wire which forms the 1 loop section 18a and the 2nd loop section 18b turns. That is, the direction of the magnetic flux generated from the second loop section 18b and linked to the first loop section 18a through the power transmission core 40 is the same as the direction of the magnetic flux generated from the first loop section 18a. Wires forming the first loop section 18a and the second loop section 18b are circulated.

  In addition, near the inner region of each of the first power receiving coil 24 a and the second power receiving coil 24 b, a power receiving side core (not shown) as a magnetic member is provided. The power receiving side core may have a U-shape connecting the vicinity of the region inside the first power reception coil 24a and the vicinity of the region inside the second power reception coil 24b. In this case, the power receiving core crosses the vicinity of the region inside the first power receiving coil 24a and the vicinity of the region inside the second power receiving coil 24b on the back side of the drawing with respect to the power receiving substrate 32.

  The first loop section 18a of the power transmission coil 18 and the first power receiving coil 24a are disposed in a positional relationship in which the magnetic flux generated by one crosses the other, and the second loop section 18b of the power transmission coil 18 and the second power receiving coil 24b are also arranged. Moreover, the magnetic flux which one generate | occur | produced is arrange | positioned by the positional relationship which interlinks with the other. In this way, non-contact power feeding is performed between the power supply circuit 12 and the power control circuit 30.

  Between the control unit 10 and the power control circuit 30, a signal transmission line 42a for the switching element 38a and a signal transmission line 42b for the switching element 38b are separately provided. Each of the signal transmission lines 42a and 42b is constituted by two conducting wires for transmitting signals.

  An electromagnetic coupler 44a is provided in the signal transmission line 42a, and the control unit 10 and the power control circuit 30 are connected via the electromagnetic coupler 44a. Similarly, an electromagnetic coupler 44b is provided in the signal transmission line 42b, and the control unit 10 and the power control circuit 30 are connected via the electromagnetic coupler 44b.

  The electromagnetic coupler 44a includes a transmitting linear conductor 26a and a receiving linear conductor 28a aligned in the longitudinal direction and facing each other, and one of the linear conductors is connected by electrical or magnetic coupling of the pair of linear conductors. A signal transmission path is formed between the circuit of (1) and the circuit on the other linear conductor side.

  The electromagnetic coupler 44b includes a transmitting linear conductor 26b and a receiving linear conductor 28b aligned in the longitudinal direction, and one linear conductor side by electric or magnetic coupling of the pair of linear conductors. A signal transmission path is formed between the circuit of (1) and the circuit on the other linear conductor side.

  The transmission linear conductor of each of the electromagnetic couplers 44 a and 44 b is fixed to the power transmission substrate 20, and the reception linear conductor is fixed to the power reception substrate 32. When the power transmission substrate 20 and the power reception substrate 32 face each other, these linear conductors (coupling conductors) face each other to form an electromagnetic coupler. The control unit 10 performs noncontact communication with the power control circuit 30 via an electromagnetic coupler.

  The pair of linear conductors provided in each electromagnetic coupler is not in direct contact with each other, and the power transmission coil 20 and each power reception coil are not in direct contact, so the power transmission substrate 20 and the power reception substrate 32 may be detachable. .

  The power supply circuit 12 outputs an alternating voltage to the power transmission coil 18 according to the control of the control unit 10. As a result, from the first loop section 18a and the second loop section 18b of the power transmission coil 18, magnetic fluxes that interlink with the first power reception coil 24a and the second power reception coil 24b are generated, and the first power reception coil 24a and the second power reception coil 24a are generated. An induced electromotive force is generated in the power receiving coil 24b. The first power receiving coil 24 a and the second power receiving coil 24 b output AC power based on the induced electromotive force to the power control circuit 30 as a power receiving circuit. The rectifier circuit 33a converts AC power output from the first power receiving coil 24a into DC power, and outputs the DC power to the reception circuit 34a and the drive circuit 36a. Similarly, the rectifier circuit 33 b converts the AC power output from the second power receiving coil 24 b into DC power, and outputs the DC power to the reception circuit 34 b and the drive circuit 36 b.

  The control unit 10 outputs a control signal for controlling the switching element 38a to the electromagnetic coupler 44a. The electromagnetic coupler 44a transmits the control signal to the receiving circuit 34a. The receiving circuit 34a controls the drive circuit 36a in accordance with the control signal, and the drive circuit 36a controls the on / off of the switching element 38a. Similarly, the control unit 10 outputs a control signal for controlling the switching element 38b to the electromagnetic coupler 44b. The electromagnetic coupler 44b transmits the control signal to the receiving circuit 34b. The receiving circuit 34 b controls the drive circuit 36 b according to the control signal, and the drive circuit 36 b controls the switching element 38 b on and off.

  The switching elements 38a and 38b adjust the powers output from the rectifier circuits 33a and 33b according to the on / off control by the drive circuit 36a and the drive circuit 36b, and output the power to the load circuit.

  Here, although the structure regarding the U phase of the electric power system for vehicle mounting was demonstrated, the structure regarding V phase and W phase has a structure similar to U phase. As shown in FIG. 1, the V-phase power card 14v and the W-phase power card 14w may be controlled by a control unit 10 common to the U-phase power card 14u. Also, power may be supplied to the V-phase power card 14 v and the W-phase power card 14 w from the power supply circuit 12 common to the U-phase power card 14 u.

  FIG. 3 conceptually shows the configurations of the power transmission coil 18, the first power reception coil 24a, and the second power reception coil 24b. This figure is for explaining the physical phenomenon which arises in each coil, and does not show the structure of each coil exactly. In addition, the directions in the upper, lower, left, and right directions in the following description are for convenience of describing the structure, and do not limit the posture of an object to be described (the same applies to other drawings). . The power transmission coil 18 includes a terminal T1, conductor sections c1 to c24, and a terminal T2. A conducting wire section c1 extends from the conducting wire terminal T1 in the y-axis positive direction, and a conducting wire section c2 extends from the end of the conducting line section c1 in the x-axis negative direction. A conductor section c3 extends from the end of the conductor section c2 in a diagonally forward direction with respect to the y-axis negative direction, and a conductor section c4 extends from the end of the conductor section c3 in the x-axis negative direction. Conductor segment c5 extends from the end of conductor segment c4 in the positive y-axis direction, and conductor segment c6 extends from the end of conductor segment c5 in the positive x-axis direction. A wire segment c7 extends from the end of the wire segment c6 diagonally forward with respect to the y-axis positive direction, and a wire segment c8 extends from the end of the wire segment c7 in the x-axis positive direction. The conducting wire section c7 is located below the conducting wire section group (c3, c11, c19) extending in the forward oblique direction with respect to the y-axis negative direction.

  Thus, the conductor sections c1 to c8 circulate in a substantially eight-like shape. Similarly, conductor segments c9 to c16 circulate in a substantially eight shape adjacent to conductors c1 to c8 respectively, and conductor segments c17 to c24 respectively adjoin to conductor segments c9 to c16 and substantially eight The terminal T2 is formed at the end of the conductor section c24. The first loop section 18a is formed by the portions on the left side of the intersection positions where the conductor sections c3, c11 and c19 intersect the conductor sections c7, c15 and c23, and the second loop section is formed by the portions on the right side 18b is formed.

  The power transmission side core 46 is provided between the vicinity of the area inside the first loop section 18 a and the vicinity of the area inside the second loop section 18 b. That is, the power transmission side core 46 straddles between the vicinity of the region inside the first loop section 18 a and the vicinity of the region inside the second loop section 18 b.

  The first power receiving coil 24a is located below the first loop section 18a. The first power receiving coil 24a includes a terminal Ta1, a lead wire section d1 to d10, and a terminal Ta2. A wire section d1 extends from the terminal Ta1 in the positive x-axis direction, and a wire section d2 extends in the positive y-axis direction from the end of the wire section d1. Conductor segment d3 extends from the end of conductor segment d2 in the x-axis negative direction, conductor segment d4 extends from the end of conductor segment d3 in the y-axis negative direction, and conductor segment d5 extends from the end of conductor segment d4 in the positive x-axis direction ing. As such, the wire segments d1 to d5 draw a substantially rectangular loop. From the end of the lead section d5, a lead section d6 extends in the positive x-axis direction below the lead section d1. Conductor sections d6 to d10 respectively draw a substantially rectangular loop below the conductor sections d1 to d5, and a terminal Ta2 is formed at the end of the conductor section d10.

  The second power receiving coil 24b is located below the second loop section 18b. The second power receiving coil 24b has a structure similar to that of the first power receiving coil 24a, and has a terminal Tb1, two lead wire sections describing a loop around the circumference, and a terminal Tb2.

  A power reception side core 48 is provided between the vicinity of the region inside the first power reception coil 24 a and the vicinity of the region inside the second power reception coil 24 b. That is, the power receiving side core 48 straddles between the vicinity of the region inside the first power reception coil 24 a and the vicinity of the region inside the second power reception coil 24 b.

  While alternating current flows through the terminals T1 and T2 of the power transmission coil 18, current flows into the terminal T1 of the power transmission coil 18, and current flows out from the terminal T2, clockwise current flows into the first loop section 18a. And a counterclockwise current flows in the second loop section 18b. As a result, the first loop section 18a is penetrated downward in the first loop section 18a, and magnetic flux is generated in the first power receiving coil 24a, and induction is generated from the terminals Ta1 and Ta2 of the first power receiving coil 24a. Power is output. On the other hand, in the second loop section 18b, the second loop section 18b is penetrated in the upper direction, and magnetic flux is generated in the second power receiving coil 24b, and induced electromotive force is generated from the terminals Tb1 and Tb2 of the second power receiving coil 24b. Is output.

  While alternating current flows to terminal T1 and terminal T2 of power transmission coil 18, current flows out from terminal T1 of power transmission coil 18, and current flows into terminal T2, direction of current flowing to each power receiving coil, each power reception The direction of the magnetic flux linked to the coil and the polarity of the induced electromotive force output from each power receiving coil are opposite to the above.

  According to such a configuration, the direction of the magnetic flux generated from the first loop section 18 a and linked to the second loop section 18 b through the power transmission core 46 and the direction of the magnetic flux generated from the second loop section 18 b Become the same. Similarly, the direction of the magnetic flux generated from the second loop section 18b and linked to the first loop section 18a through the power transmission core 46 is the same as the direction of the magnetic flux generated from the first loop section 18a. Furthermore, the power transmission side core 46 and the power reception side core 48 form a magnetic path passing inside the first loop section 18a, inside the first power receiving coil 24a, inside the second power receiving coil 24b, and through the second loop section 18b. . Here, the magnetic path means a path through which the magnetic flux is concentrated and the magnetic flux is guided. The magnetic flux generated from the first loop section 18a and the second loop section 18b concentrates on the above magnetic path. Therefore, as compared with the case where the power transmission side core 46 and the power reception side core 48 are not used, the mutual inductance between the power transmission coil 18 and each power reception coil is increased.

  In addition, the power transmission coil provided with two loop area was demonstrated above. The power transmission coil may include three or more loop sections. FIG. 4A conceptually shows an example of the configuration of the power transmission coil 50 in which each loop section is provided with one turn of the conducting wire. The arrows in the figure indicate the direction of the current flowing through the power transmission coil 50 at a certain point in time. Adjacent two loop sections circulate in a substantially eight shape. Although not shown in FIG. 4A, the receiving coil faces each of the plurality of loop sections. The magnetic flux generated in each loop section is linked to the power receiving coil opposed to each loop section, and causes each power receiving coil to generate an induced electromotive force.

  Moreover, the side surface of the power transmission coil 50 is shown by FIG.4 (b). The protruding portion of the power transmission side core 52 protrudes toward the inner region of each loop section. Similar to the power transmission core 52, a power reception core projecting toward the inner region of each power reception coil may be provided on the power reception coil side facing each of the plurality of loop sections.

  According to such a configuration, the direction of the magnetic flux generated from one loop section and linked to the adjacent loop section is the same as the direction of the magnetic flux generated from the adjacent loop section. In addition, the power transmission side core 52 forms a magnetic path that guides the magnetic flux from each loop section to the opposing power receiving coil. This increases the mutual inductance between the power transmission coil and each power reception coil as compared to the case where the power transmission side core is not used.

  The structural example of a power transmission coil and a receiving coil is shown by FIG. The power transmission coil 181 includes a first loop section 181 a and a second loop section 181 b. A terminal T1 is formed at one end of the first loop section 181a. The first loop section 181a extends from the terminal T1 in the y-axis positive direction and then makes a round in a rectangular shape clockwise and forms a jumper section 54 straddling itself, and then extends in the x-axis positive direction and its end It reaches the start end 58 of the second loop section 181b. The second loop section 181b extends from the start end 58 in the x-axis positive direction and extends in the y-axis negative direction, and then makes one round counterclockwise in a rectangular shape to form a jumper section 56 straddling itself, and then ends Leading to the formed terminal T2.

  The first power receiving coil 24a and the second power receiving coil 24b are located below the first loop section 181a and the second loop section 181b, respectively. The first power receiving coil 24 a and the second power receiving coil 24 b have the same structure as the first power receiving coil 24 a and the second power receiving coil 24 b shown in FIG. 3.

  While the current flows into the terminal T1 of the power transmission coil 181 and the current flows out from the terminal T2, a clockwise current flows in the first loop section 181a, and a counterclockwise current in the second loop section 181b. Flows. As a result, the first loop section 181a penetrates the first loop section 181a downward from the first loop section 181a, and a magnetic flux that interlinks is generated in the first power receiving coil 24a, and induction is generated from the terminals Ta1 and Ta2 of the first power receiving coil 24a. Power is output. On the other hand, the second loop section 181b is penetrated upward from the second loop section 181b, and magnetic flux is generated in the second power receiving coil 24b, and induced electromotive force is generated from the terminals Tb1 and Tb2 of the second power receiving coil 24b. Is output. While the current flows into the terminal T2 of the power transmission coil 181 and the current flows out from the terminal T1, the directions of the current and the magnetic flux are reversed from the above.

  FIG. 6 shows a configuration example of the power transmission coil 182 in which the first loop section 182a and the second loop section 182b each have a loop shape of two turns. The same components as those shown in FIG. 5 will be assigned the same reference numerals and descriptions thereof will be omitted.

  A terminal T1 is formed at one end of the first loop section 182a. The first loop section 182a extends from the terminal T1 in the positive y-axis direction, and then turns twice clockwise inward in a rectangular shape and forms a jumper section 54 straddling itself, and then extends in the positive x-axis direction The end of the lead reaches the start end 58 of the second loop section 182b. The second loop section 182b extends from the start end 58 in the x-axis positive direction and extends in the y-axis negative direction, and then forms a jumper section 56 that straddles itself and makes two rounds in a rectangular shape inward counterclockwise. After that, the terminal T2 formed at the end is reached.

  FIG. 7 shows a state in which a plurality of power cards 14 are attached to the cooler 60. The cooler 60 includes an inflow pipe 62, an outflow pipe 64, and a plurality of cooling fins 66. The cooling fin 66 is formed in a plate shape, and a cavity through which the refrigerant flows is formed inside. The plurality of cooling fins 66 are aligned at predetermined intervals with the plate surface direction aligned. The power card 14 is disposed between two adjacent cooling fins 66. FIG. 7 shows an example in which eight power cards 14 are disposed between the cooling fins 66. Each power card 14 includes two switching elements forming one switching arm. A power transmission board 20 is stacked on top of each power card 14. A wiring board 72 is joined vertically to each power transmission board 20 at an upper end portion of each power transmission board 20, and each wiring provided on the wiring board 72 is connected to each power transmission board 20.

  In each cooling fin 66, an inflow pipe 62 is provided near the end on the back side in FIG. 7, and an outflow pipe 64 is provided near the end on the front side. The inflow tube 62 communicates with the internal cavity of each cooling fin 66, and the cavity of each cooling fin 66 communicates with the outflow tube 64. The inflow pipe 62 guides the refrigerant flowing from the inlet 68 to the cavity of each cooling fin 66. The refrigerant passing through the cavity of each cooling fin 66 takes heat from the adjacent power card 14 to cool the power card 14. The refrigerant is discharged from the cavity of each cooling fin 66 to the outflow pipe 64. The outflow pipe 64 leads the refrigerant discharged from each cooling fin 66 to its outlet 70.

  The power card 14 and the power transmission board 20 are shown in FIG. However, the state before the power card 14 is covered with the mold material is shown. Further, for convenience of explanation, the power transmission substrate 20 has the power transmission coil 18, the transmission linear conductor 26a, and the transmission linear conductor 26b shown through the power transmission side core and the dielectric plate.

  The power card 14 includes a first power receiving coil 24a, a receiving linear conductor 28a, and a drive circuit module 74a as components for operating the switching element 38a, in addition to the switching element 38a. Furthermore, the power card 14 includes a second power receiving coil 24b, a receiving linear conductor 28b, and a drive circuit module 74b as components for operating the switching element 38b, in addition to the switching element 38b. Further, the power card 14 includes the power receiving substrate 32 to which the first power receiving coil 24 a, the receiving linear conductor 28 a, the second power receiving coil 24 b, and the receiving linear conductor 28 b are fixed. Drive circuit module 74a includes rectifier circuit 33a, receiver circuit 34a and drive circuit 36a shown in FIG. 2, and drive circuit module 74b includes rectifier circuit 33b, receiver circuit 34b and drive circuit 36b shown in FIG. Prepare.

  The receiving linear conductor 28a and the receiving linear conductor 28b are disposed between the receiving coil 24a and the receiving coil 24b. That is, the receiving linear conductor 28a is juxtaposed to the receiving coil 24a, and the receiving linear conductor 28b is juxtaposed to the receiving coil 24b.

  The power transmission coil 18, the transmission linear conductor 26a, and the transmission linear conductor 26b are fixed to the power transmission substrate 20. The transmission linear conductors 26a and 26b are disposed between the first loop section 18a and the second loop section 18b. That is, the transmission linear conductor 26a is juxtaposed in the first loop section 18a, and the transmission linear conductor 26b is juxtaposed in the second loop section 18b. In the power transmission board 20, the first loop section 18a faces the first power receiving coil 24a, the transmission linear conductor 26a faces the receiving linear conductor 28a, and the second loop section 18b faces the second power receiving coil 24b, Furthermore, the transmission linear conductor 26 b is superimposed on the power receiving substrate 32 so as to face the reception linear conductor 28 b. When the power transmission substrate 20 is superimposed on the power reception substrate 32, the transmission linear conductor 26a and the reception linear conductor 28a are opposed to form an electromagnetic coupler, and the transmission linear conductor 26b and the reception linear conductor 28b are opposed. An electromagnetic coupler is formed.

  The switching element 38a and the switching element 38b shown in FIG. 8 constitute a switching arm, and three electrodes 76 are drawn from the switching arm. Also, the power card 14 is molded with an insulator material and formed into a plate shape that is sandwiched between cooling fins.

  In FIG. 9, the AA line cross section of FIG. 8 is additionally written. However, in FIG. 9, the power transmission side core 40 and the power reception side core 78 are drawn. FIG. 10A shows a cross section taken along the line BB in FIG. FIG. 10 (b) shows a cross section taken along line CC of FIG. As shown in FIG. 9, the power transmission board 20 is covered by the power transmission core 40 at the top. Power transmission side core 40 has rectangular plate-like portion 80 and the same width as the width of plate-like portion 80 in the depth direction, and has outer wall portions 84 a and 84 b extending downward from both left and right sides of plate-like portion 80. doing. From the lower surface of the plate-like portion 80 of the power transmission core 40, the power transmission protrusion 82a protrudes toward the region inside the first loop section 18a. Furthermore, the power transmission protrusion 82b protrudes toward the region inside the second loop section 18b.

  The power transmission coil 18 may be provided on the lower surface of the power transmission board 20, or may be provided on multiple layers in the power transmission board 20.

  Further, the power receiving substrate 32 is covered by the power receiving core 78 at the lower side. Power receiving core 78 has rectangular plate-like portion 86, and the same width as the width of plate-like portion 86 in the depth direction, and has outer wall portions 90a and 90b extending upward from both left and right sides of plate-like portion 86. doing. From the upper surface of the plate-like portion 86 of the power receiving core 78, the power receiving protrusion 88a protrudes toward the region inside the power receiving coil 24a. Furthermore, the power reception protrusion 88b protrudes toward the region inside the power reception coil 24b. The tips of the outer walls at both ends of the power transmission core 40 are in contact with the tips of the outer walls at both ends of the power receiving core 78.

  The power receiving coils 24 a and 24 b may be provided on the upper surface of the power receiving substrate 32 or may be provided on multiple layers in the power receiving substrate 32.

  According to such a configuration, the direction of the magnetic flux generated from the first loop section 18 a and linked to the second loop section 18 b through the power transmission core 40 and the direction of the magnetic flux generated from the second loop section 18 b Become the same. Similarly, the direction of the magnetic flux generated from the second loop section 18b and linked to the first loop section 18a through the power transmission core 40 is the same as the direction of the magnetic flux generated from the first loop section 18a.

  Then, the magnetic path F1 is formed by the power transmission side core 40 and the power reception side core 78, inside the first loop section 18a, inside the first power receiving coil 24a, inside the second power receiving coil 24b, and through the second loop section 18b. Ru. Also, a magnetic path F2 is formed which passes inside the first loop section 18a, the outer wall 84a of the power transmission core 40, the outer wall 90a of the power reception core 78, and the inside of the first power receiving coil 24a. Furthermore, a magnetic path F3 passing through the inside of the second loop section 18b, the outer wall 84b of the power transmission core 40, the outer wall 90b of the power receiving core 78, and the inside of the second power receiving coil 24b is formed.

  The magnetic flux generated from the first loop section 18a and the second loop section 18b concentrates on these magnetic paths. Therefore, as compared with the case where the power transmission side core 40 and the power reception side core 78 are not used, the mutual inductance between the power transmission coil and each power reception coil is increased.

  FIG. 11 shows a modified example of the coupling structure of the power transmission coil and the power reception coil. In this modification, protrusion receiving holes 92a and 92b are provided inside the first loop section 18a and the second loop section 18b of the power transmission substrate 20, respectively. The power transmission protrusion 82a of the power transmission core 40 is inserted into the protrusion receiving hole 92a, and the power transmission protrusion 82b is inserted into the protrusion receiving hole 92b. Also, the power transmission board 20 is provided with an outer wall receiving hole 94a for receiving the left outer wall 84a of the power transmission core 40, and an outer wall receiving hole 94b for receiving the right outer wall 84b of the power transmission core 40. . The outer wall 84a of the power transmission core 40 is inserted into the outer wall receiving hole 94a, and the outer wall 84b is inserted into the outer wall receiving hole 94b. The lengths in the vertical direction of the power transmission protruding portions 82 a and 82 b and the outer wall portions 84 a and 84 b of the power transmission side core 40 are lengths such that the tips thereof terminate at the lower surface of the power transmission substrate 20.

  Similarly, in this modification, the protrusion receiving holes 96a and 96b for receiving the power receiving protrusion 88a and the power receiving protrusion 88b are provided inside the first power receiving coil 24a and the second power receiving coil 24b in the power receiving substrate 32. ing. Furthermore, the power receiving substrate 32 is provided with an outer wall receiving hole 98a for receiving the left outer wall 90a of the power receiving core 78, and an outer wall receiving hole 98b for receiving the right outer wall 90b of the power receiving core 78. . Each protrusion is inserted in each receiving hole. The lengths of the power receiving protrusions 88 a and 88 b and the outer walls 90 a and 90 b in the vertical direction are lengths such that their tips end on the top surface of the power receiving substrate 32. According to such a configuration, the mutual inductance between the power transmission coil and each power reception coil is increased by the same principle as the coupling structure of the power transmission coil and the power reception coil as shown in FIGS. 9 and 10.

  In addition, it replaces with the power transmission side core 40 shown by FIG. 9 and FIG. 11, and the magnetic body layer formed with the magnetic body on the upper surface of the power transmission board 20 may be provided. The magnetic layer may extend to the peripheral edge of the power transmission substrate 20. Similarly, instead of the power receiving side core 78 shown in FIG. 9 and FIG. 11, a magnetic material layer formed of a magnetic material may be provided on the lower surface of the power receiving substrate 32. The magnetic layer may extend to the peripheral edge of the power receiving substrate 32.

  The cross section of the power card 14 and the power transmission board 20 is schematically shown in FIG. As the power transmission board 20 and the power reception board 32, those having the configuration of FIG. 11 are used. FIG. 12 (a) shows a cross section passing through the transmission linear conductor 26a and the reception linear conductor 28a. An electromagnetic coupler is formed by the transmission linear conductor 26 a and the reception linear conductor 28 a facing each other, and a control signal is transmitted from the control unit described above to the power control circuit.

  FIG. 12 (b) shows a cross section passing through the first loop section 18 a of the power transmission coil 18 and the power receiving coil 24 a. The first loop section 18a and the power receiving coil 24a face each other, and non-contact power feeding is performed from the above-described power supply circuit to the power control circuit. A conducting wire is drawn from the power transmission coil 18 to the wiring board 72.

  FIG. 13 shows a configuration in which U-phase power card 14 u, V-phase power card 14 v and W-phase power card 14 w are connected. 13 (a) shows a cross section passing through the transmission linear conductors 26aU to 26aW and the reception linear conductors 28aU to 28aW, and FIG. 13 (b) shows a first loop section of the transmission coils 18U to 18W. Cross sections through 18aU-18aW and receiving coils 24aU-14aW are shown. As each power transmission board and each power reception board, one having the configuration of FIG. 11 is used. The power transmission board and the power card have the same configuration for each phase, but add “U”, “V” and “W” to the end of the code to distinguish the phase to which the component belongs.

  A conducting wire is drawn out to the wiring board 72 from each of the power transmission coil 18U of the power transmission substrate 20U, the power transmission coil 18V of the power transmission substrate 20V, and the power transmission coil 18W of the power transmission substrate 20W, and these power transmission coils are connected in series.

  An equivalent circuit is shown in FIG. One primary winding P is configured by connecting in series the power transmission coil 18U, the power transmission coil 18V, and the power transmission coil 18W. The two receiving coils of U-phase power card 14u form secondary windings Ua and Ub. The two receiving coils of V-phase power card 14v form secondary windings Va and Vb. The two receiving coils of W-phase power card 14 w constitute secondary windings Wa and Wb.

  According to such a configuration, the structure is simplified since only one power transmission coil is required. In addition, the mutual inductance between the primary winding and each secondary winding is increased due to the power transmission side core and the power reception side core, as compared with the case where the power transmission side core and the power reception side core are not used. The coupling coefficient with the winding increases. As a result, sufficient power is supplied from the current supply circuit to the power control circuit.

  In the above, the embodiment has been described in which the power transmission coil is composed of the first loop section and the second loop section, and the first loop section and the second loop section circulate in a figure of eight. FIG. 15 shows a configuration in which a transmitting coil 18 having one loop section and two receiving coils 24 a and 24 b are magnetically coupled.

  FIG. 15A shows a cross-sectional view of the combined structure of the power transmission coil 18 and the power receiving coils 24a and 24b. The figure which looked at the power transmission board 20 from lower side is shown by FIG.15 (b). The figure which looked at the call | power receiving board 32 from the upper side is shown by FIG.15 (c).

  As shown in FIG. 15A, on the power transmission board 20, a power transmission coil 18 having one loop section is disposed. The power transmission board 20 is covered at the upper side by the power transmission side core 40.

  Power transmission side core 40 has rectangular plate-like portion 80 and the same width as the width of plate-like portion 80 in the depth direction, and has outer wall portions 84 a and 84 b extending downward from both left and right sides of plate-like portion 80. doing. A power transmission protrusion 82 projects from the lower surface of the plate-like portion 80 of the power transmission core 40 toward the region inside the power transmission coil 18.

  The tip of each of the power transmission protrusion 82 and the outer walls 84 a and 84 b is in contact with the top surface of the power transmission board 20. The tip of each of the power transmission protrusion 82 and the outer wall portions 84 a and 84 b may be separated from the top surface of the power transmission substrate 20.

  In addition, the power receiving substrate 32 is covered by the power receiving side core 78 at the lower side. The power receiving core 78 has the same width as the rectangular plate-like portion 86 and the width of the plate-like portion 86 in the depth direction, and the outer wall portions 90a and 90b extend upward from both left and right sides of the plate-like portion 86. have. The outer wall 90a is directed to the inner area of the power receiving coil 24a, and the outer wall 90b is directed to the inner area of the power receiving coil 24b. Furthermore, from the upper surface of the plate-like portion 86 of the power receiving core 78, the power receiving protrusion 88 protrudes toward the region inside the power transmission coil 18.

  The tips of the power receiving protrusion 88 and the outer walls 90 a and 90 b are in contact with the lower surface of the power receiving substrate 32. The tip of each of the power receiving protrusion 88 and the outer wall portions 90 a and 90 b may be separated from the lower surface of the power receiving substrate 32.

  According to such a configuration, the power transmission side core 40 and the power reception side core 78 allow the inside of the power transmission coil 18, the power reception protrusion 88, the left outer wall 90a of the power reception core 78, and the left outer wall of the power transmission core 40 A magnetic path is formed through 84 a and the transmission projection 82. A magnetic path is formed through the inside of the power transmission coil 18, the power reception protrusion 88, the outer wall 90 b on the right of the power reception core 78, the outer wall 84 b on the right of the power transmission core 40, and the power transmission 82.

  The magnetic flux generated from the power transmission coil 18 concentrates on these magnetic paths. Therefore, as compared with the case where the power transmission side core 40 and the power reception side core 78 are not used, the mutual inductance between the power transmission coil and each power reception coil is increased.

  FIG. 16 shows a modification of the coupling structure of the power transmission coil and the power reception coil. In this modification, holes for receiving the power transmission protrusions 82 and the outer wall portions 84a and 84b are provided in the power transmission substrate 20, and the power transmission protrusions 82 and the outer wall portions 84a and 84b are inserted into the respective receiving holes. The length of the power transmission protrusion 82 and the outer wall portions 84 a and 84 b is such a length that their tip ends at the lower surface of the power transmission substrate 20.

  Further, the power receiving substrate 32 is provided with holes for receiving the power receiving protrusion 88 and the outer walls 90a and 90b, and the power receiving protrusions 88 and the outer walls 90a and 90b are inserted into the respective receiving holes. The length of the power receiving protrusion 88 and the outer wall portions 90 a and 90 b is such a length that their tip ends at the lower surface of the power receiving substrate 32.

  According to such a configuration, the mutual inductance between the transmitting coil and each receiving coil is increased by the same principle as the coupling structure of the transmitting coil and the receiving coil shown in FIG.

  In addition, it replaces with the power transmission side core 40 shown by FIG. 15 and FIG. 16, and the magnetic body layer formed with the magnetic body may be provided in the upper surface of the power transmission board | substrate 20. FIG. The magnetic layer may extend to the peripheral edge of the power transmission substrate 20. Similarly, instead of the power receiving side core 78 shown in these figures, a magnetic material layer formed of a magnetic material may be provided on the lower surface of the power receiving substrate 32. The magnetic layer may extend to the peripheral edge of the power receiving substrate 32.

10 control unit, 12 power supply circuit, 14u U-phase power card, 14v V-phase power card, 14w W-phase power card, 16 load circuit, 18, 50 power transmission coil, 18a first loop section, 18b second loop section, 20 Power transmission board, 24a first power receiving coil, 24b second power receiving coil, 26a, 26b transmission linear conductor, 28a, 28b reception linear conductor, 30 power control circuit, 32 power reception board, 33a, 33b rectifier circuit, 34a, 34b reception Circuit, 36a, 36b drive circuit, 38a, 38b switching element, 40, 46, 52 Power transmission side core, 42a, 42b signal transmission path, 44a, 44b electromagnetic coupler, 48, 78 Power reception side core, 54, 56 Jumper section, 58 Start of second loop section, 60 cooler, 62 inlet pipe, 64 outlet pipe, 66 cooling fins, 8 entrance, 70 exit, 72 wiring board, 74a, 74b drive circuit module, 76 electrode, 80, 86 plate, 82, 82a, 82b power transmission protrusion, 84a, 84b, 90a, 90b outer wall, 88, 88a, 88b power receiving projection, 92a, 92b, 96a, 96b projection receiving hole, 94a, 94b, 98a, 98b outer wall receiving hole.

Claims (10)

A power transmission coil having a section that describes a loop shape;
A power transmission board provided with the power transmission coil;
A magnetic member provided on the power transmission board;
A power supply circuit for supplying power to the power transmission coil;
The power supplied from the power supply circuit generates a magnetic flux linked to the power receiving coil from the power transmitting coil,
The non-contact power feeding device, wherein the magnetic member guides the magnetic flux generated from the power transmission coil to the power reception coil. In the non-contact power feeding device according to claim 1,
A coupled conductor provided on the power transmission board and juxtaposed to the power transmission coil;
The control unit which performs non-contact communication with the receiving circuit connected to the said receiving coil via the said coupling conductor, The non-contact electric power supply characterized by the above-mentioned. In the non-contact power feeding device according to claim 1 or 2,
The power transmission coil has a plurality of loop sections each drawing a loop shape, and the plurality of loop sections are arranged in series.
The direction in which the conductors forming the two adjacent loop sections circulate is opposite,
Magnetic fluxes interlinking with the plurality of power receiving coils corresponding to the plurality of loop sections are generated from each of the loop sections,
The non-contact power feeding device, wherein the magnetic member guides the magnetic flux generated from each of the loop sections to each of the power receiving coils. The noncontact power feeding device according to any one of claims 1 to 3.
The non-contact power feeding device, wherein the magnetic material member is a layer of a magnetic material provided on the power transmission substrate. The noncontact power feeding device according to any one of claims 1 to 3.
The magnetic member is provided on a plate surface of the power transmission board, the plate surface being opposite to the power receiving coil side.
A non-contact power feeding device comprising: a power transmission protrusion directed to an area inside a loop shape of the power transmission coil. A plurality of receiving coils that draw a loop shape,
A power receiving board provided with each of the power receiving coils;
A power receiving circuit provided corresponding to each of the plurality of power receiving coils and connected to each of the plurality of power receiving coils;
And a magnetic member provided on the power receiving substrate,
The electric circuit module, wherein the magnetic member guides the magnetic flux generated from the power transmission coil to each of the power reception coils. In the electric circuit module according to claim 6,
A combined conductor provided on the power receiving substrate, juxtaposed to each of the power receiving coils, and connected to each of the power receiving circuits, for performing non-contact communication with a control unit that controls each of the power receiving circuits. An electrical circuit module comprising: a coupled conductor. The electric circuit module according to claim 6 or 7, wherein the power transmission coil has a plurality of loop sections each drawing a loop shape, and the plurality of loop sections are arranged in series.
The electric circuit module according to claim 1, wherein the plurality of power receiving coils are arranged in series with the power receiving substrate, and the loop sections face the power receiving coils corresponding to the loop sections. The electric circuit module according to any one of claims 6 to 8.
The electric circuit module, wherein the magnetic material member is a layer of a magnetic material provided on the power receiving substrate. The electric circuit module according to any one of claims 6 to 8.
The magnetic member is provided on a plate surface of the power receiving substrate, the plate surface opposite to the power transmission coil side,
An electric circuit module, comprising: a power receiving protrusion directed to an area inside a loop shape of the power receiving coil.