JP2011205806A - Vehicle multi-phase converter - Google Patents

Abstract

In a multiphase boost converter for a vehicle, the boosting operation and the charging operation can be switched, and the number of reactors is substantially reduced to reduce the cost.
A multiphase boost converter for a vehicle includes reactors L1, L2, and L3. By switching the relays Re1 to Re7, the boosting mode and the charging mode are switched. Reactors L1 and L2 are formed in the core structure and magnetically coupled, and reactor L3 is also formed in the remaining magnetic path of the same core structure, thereby suppressing an increase in volume.
[Selection] Figure 1

Description

  The present invention relates to a vehicle multiphase converter, and more particularly to a relay switching type multiphase converter that can be charged by an external power source.

  In a hybrid vehicle, an electric vehicle, a fuel cell vehicle, and the like, a boost converter that boosts the power supply voltage and supplies it to the inverter is used to measure the optimization of the power supply voltage and the drive voltage of the inverter. On the other hand, depending on the specification of the vehicle, a charging device is required. For example, a plug-in hybrid vehicle requires a charger for charging the in-vehicle secondary battery with electric power from a household power source. The function as a step-up converter and the charging function for charging the in-vehicle secondary battery with power from an external power source can be appropriately switched using a relay.

  FIG. 9 shows an example of a vehicular multi-phase converter capable of switching between a function as a boost converter and a charging function. This is a relay switching type two-phase boost converter.

  A positive electrode side terminal of the switching element S1 and a positive electrode side terminal of the switching element S3 are connected in parallel to the positive electrode side of the secondary battery Vb via the relay Re3, and a negative electrode of the switching element S2 is connected to the negative electrode side of the secondary battery Vb. Side terminal and the negative electrode side terminal of the switching element S4 are connected in parallel. The other terminal of the switching element S1 and the other terminal of the switching element S2 are connected in series, and the other terminal of the switching element S3 and the other terminal of the switching element S4 are connected in series. Further, the positive terminal of the capacitor C1 is connected in parallel with the switching elements S1 to S4 via the relay Re3 to the positive terminal of the secondary battery Vb, and the negative terminal of the capacitor C1 is connected to the secondary battery Vb via the resistor R1. Connected to the negative electrode side.

  Further, the relay Re1 and the reactor L1 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S3 and the switching element S4. In parallel with this, the relay Re2 and the reactor L2 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S2 and the switching element S2. An outlet (power plug) 10 connected to a household power supply (AC100V) is connected between the relay Re1 and the reactor L1, and between the relay Re2 and the reactor L2.

  Further, the positive terminal of the capacitor C1 is connected to the positive terminal of the capacitor C2 via the relay Re4, the relay Re5, and the resistor R2 connected in parallel. The negative electrode side terminal of the capacitor C2 is connected to the negative electrode side terminal of the capacitor C2 through the resistor R1 and the relay Re6 which are connected in parallel to each other and via the relay Re7. Capacitor C2 is connected to inverter 12.

  Here, the resistors R1 and R2 are resistors for charging the capacitors C1 and C2, respectively, and are for turning on the main relay after balancing the capacitor voltages. The capacitor C2 is a so-called smoothing capacitor, and the relays Re4, Re5, and Re7 are system main relays. Compared with a simple boost converter, relays Re1, Re2, Re3, Re6, a resistor R1, and a capacitor C1 are added.

  In such a configuration, when functioning as a boost converter, the relay Re3 is turned off, and the relays Re1, Re2, Re4, Re5, Re6, and Re7 are turned on. Then, by causing the switching elements S1 to S4 to be turned on and off, induced electromotive force is generated in the reactors L1 and L2, boosted to a voltage higher than the terminal voltage of the secondary battery Vb, charged the capacitor C1, and boosted to the inverter 12 Apply a voltage of.

  On the other hand, when functioning in the charging mode, the relays Re1, Re2, Re4, Re5, Re7 are turned off and the relays Re3, Re6 are turned on. Then, the circuit configuration shown in FIG. 10 is obtained, and the switching elements S1 to S4 are turned on and off to operate as an inverter. The AC power from the outlet 10 is converted into DC power to charge the capacitor C1, and the capacitor 18 The secondary battery Vb is charged by discharging.

  Although the boost converter shown in FIG. 9 is a two-phase boost converter, it is known that the multi-phase converter can be miniaturized. For example, in the following Non-Patent Document 1, a configuration in which the capacity of a boost chopper is 1 / N, N are connected in parallel, and the phase of the drive pulse is shifted by 2π / N is called an N-phase multiphase converter. ing.

  Non-Patent Documents 2 and 3 disclose the configuration of a two-phase magnetically coupled reactor.

JP-A-8-308255

”Automotive Powertrain DC / DC Converter with 25kW / dm3 by using SIC Diodes“, B. Eckardt, A. Hofmann, S. Zeltner, M. Maerz, CIPS2006 ”Performance Improvements of Interleaving VRMS with coupling inductors”, Pit-Leong Wong et al, IEEE Trns. On Power Electronics Vol.16, No.4, 2001 ”Investing Coupling Inductors in the Interleaving QSW VRM” Pit-Leong Wong, Q. Wu, Peng Xu, Proceedings APEC 2000

  However, simply making multi-phase (multi-phase) has a problem that the number of reactors increases correspondingly and the cost increases. In the configuration shown in FIG. 9, two reactors L1 and L2 are required, and the cost is increased. In addition, there is a problem that the battery current cannot be controlled. In order to control the charging current to the battery, it is conceivable to use a three-phase configuration instead of a two-phase control of the battery current in the third phase, but the number of reactors further increases by that amount. There's a problem.

  An object of the present invention is to reduce the number of reactors by substantially reducing the number of reactors while switching between a boosting operation and a charging operation in a multiphase boost converter for a vehicle.

  The present invention has a step-up mode and a charge mode that can be switched between each other, boosts the voltage of the secondary battery by a step-up reactor in the step-up mode, rectifies AC power from an external power source in the charge mode, and step-down reactor A multi-phase boost converter for a vehicle that steps down the voltage and charges the secondary battery, wherein the external power source is a single-phase power source, and the boost reactor is formed by forming two reactors in a core structure. In addition to constituting a phase magnetic coupling reactor, the step-down reactor is formed in a magnetic path portion where the step-up reactor is not formed in the core structure, so that both the step-up reactor and the step-down reactor are formed in the same core structure. It is formed.

  In one embodiment of the present invention, the core structure is configured by arranging core pieces having first, second, and third convex leg portions, which are sequentially formed at positions spaced by a predetermined interval, to face each other. The step-up reactor is formed on the first and third convex leg portions, and the step-down reactor is formed on the second convex leg portion.

  In another embodiment of the present invention, the step-down reactor includes a first step-down reactor and a second step-down reactor formed independently on the second convex leg of each pair of the core pieces, The first step-down reactor and the second step-down reactor function as a voltage conversion transformer.

  In addition, the present invention includes a step-up mode and a charge mode that can be switched between each other, boosts the voltage of the secondary battery by a step-up reactor in the step-up mode, and rectifies AC power from an external power source in the charge mode. A multi-phase boost converter for a vehicle that steps down by a step-down reactor and charges the secondary battery, wherein the external power source is a three-phase power source, and the step-up reactor has three reactors formed in a core structure And the step-down reactor is formed in a magnetic path portion where the step-up reactor is not formed in the core structure, so that the step-up reactor and the step-down reactor are formed in the same core structure. Are formed together.

  In one embodiment of the present invention, the core structure includes core pieces having first, second, third, fourth, and fifth convex legs that are sequentially formed at positions spaced apart by a predetermined distance. The step-up reactor is formed on the first, third and fifth convex legs, and the step-down reactor is formed on at least one of the second or fourth convex legs. Is done.

  In another embodiment of the present invention, the step-down reactor includes a first step-down reactor and a second step-down reactor formed independently on the second and fourth convex legs of the pair of core pieces, respectively. The first step-down reactor and the second step-down reactor function as voltage conversion transformers.

  In another embodiment of the present invention, the step-down reactor is formed on the second and fourth convex legs and connected in series or in parallel to each other.

  According to the present invention, in the multiphase boost converter for a vehicle, the boosting operation and the charging operation can be switched, and the number of reactors can be substantially reduced to reduce the cost.

It is a circuit block diagram of the multiphase boost converter for vehicles in an embodiment. It is a basic circuit block diagram of the three-phase boost converter in an embodiment. FIG. 3 is an equivalent circuit configuration diagram in a charging mode in the circuit configuration of FIG. 2. It is core structure explanatory drawing of a two-phase magnetic coupling reactor. It is explanatory drawing of a two-phase magnetic coupling reactor. It is explanatory drawing of the two-phase magnetic coupling reactor which formed the auxiliary coil of embodiment. It is a circuit block diagram of the multiphase boost converter for vehicles in other embodiments. It is core structure explanatory drawing of a three-phase magnetic coupling reactor. It is explanatory drawing of a three-phase magnetic coupling reactor. It is explanatory drawing of the three-phase magnetic coupling reactor which formed the auxiliary coil of embodiment. It is explanatory drawing of the three-phase magnetic coupling reactor in other embodiment. It is explanatory drawing of the two-phase magnetic coupling reactor in other embodiment. It is a circuit block diagram of a conventional circuit. FIG. 10 is an equivalent circuit configuration diagram in a charging mode in the circuit configuration of FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a circuit configuration of a multiphase boost converter for a vehicle in the present embodiment. The positive electrode side of the secondary battery Vb is connected in parallel with the positive electrode side terminal of the switching element S1 and the positive electrode side terminal of the switching element S3 via the reactor L3, the relay Re3 and the switch S5, and is connected to the negative electrode side of the secondary battery Vb. The negative electrode side terminal of the switching element S2 and the negative electrode side terminal of the switching element S4 are connected in parallel. The other terminal of the switching element S1 and the other terminal of the switching element S2 are connected in series, and the other terminal of the switching element S3 and the other terminal of the switching element S4 are connected in series. Further, the positive terminal of the capacitor C1 is connected in parallel with the switching elements S1 to S4 via the reactor L3, the relay Re3, and the switch S5 to the positive terminal of the secondary battery Vb, and the negative terminal of the capacitor C1 has a resistor R1. To the negative electrode side of the secondary battery Vb. Switching element S6 is connected between switching element S5 and the negative electrode of secondary battery Vb.

  Further, the relay Re1 and the reactor L1 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S3 and the switching element S4. In parallel with this, the relay Re2 and the reactor L2 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S1 and the switching element S2. An outlet (power plug) 10 connected to a household power supply (AC100V) is connected between the relay Re1 and the reactor L1, and between the relay Re2 and the reactor L2.

  The positive terminal of the capacitor C1 is connected to the positive terminal of the capacitor C2 via the relay Re4, the relay Re5, and the resistor R2 connected in parallel. The negative electrode side terminal of the capacitor C2 is connected to the negative electrode side terminal of the capacitor C2 through the resistor R1 and the relay Re6 which are connected in parallel to each other and via the relay Re7. Capacitor C2 is connected to inverter 12.

  In comparison with the circuit configuration of FIG. 9, a circuit indicated by reference symbol A in FIG. 1 is newly added. That is, the circuit A includes a reactor L3, a relay Re3, and switching elements S5 and S6. The relay Re3 and the reactor L3 are connected in series, and one end of the reactor L3 is connected to the positive electrode of the secondary battery Vb. One end of the relay Re3 is connected to the other end of the reactor L3, and the other end of the relay Re3 is connected to a connection node between the switching element S5 and the switching element S6.

  In such a configuration, when functioning in the charging mode, the relays Re1, Re2, Re4, Re5, and Re7 are turned off and the relays Re3 and Re6 are turned on. Then, when the switching elements S1 to S4 are turned on and off, the capacitor C1 is charged. After that, when the switching element S5 is turned off and the switching element S6 is turned on, a current flows to the switching element S6 via the reactor L3. At this time, when the voltage obtained by adding the induced electromotive force of the reactor L3 to the voltage of the secondary battery Vb is smaller than the voltage across the terminals of the capacitor C1, the secondary is connected from the capacitor C1 via the reactor L3 by turning on the switching element S5. A current flows through the battery Vb, and the secondary battery Vb is charged. In this way, the secondary battery Vb is charged by discharging the accumulated charge of the capacitor C1 while causing the reactor L3 to function as a step-down reactor and suppressing the current ripple that degrades the life of the secondary battery Vb.

  The configuration of FIG. 1 is substantially equivalent to the configuration of the three-phase boost converter shown in FIGS. 2 and 3 and is the same in that three reactors L1 to L3 are required. FIG. 2 is a basic circuit configuration of the three-phase boost converter, and FIG. 3 is an equivalent circuit diagram of FIG. 2 in the charging mode. Briefly explaining FIG. 2, switching element groups S1 to S6 are connected between the secondary battery Vb and the inverter 12, and a relay is connected between the positive electrode of the secondary battery Vb and the connection node of the switching elements S1 and S2. Re1 and the reactor L1 are connected. In parallel with this, the relay Re2 and the reactor L2 are connected between the positive electrode of the secondary battery Vb and the connection node of the switching element S3 and the switching element S4. In parallel with this, the relay Re3 and the reactor L3 are connected to the positive electrode of the secondary battery Vb and the connection node of the switching element S5 and the switching element S6. The outlet 10 is connected to a connection node between the relay Re1 and the reactor L1 and a connection node between the relay Re2 and the reactor L2 through a filter. In the step-up mode, the relays Re1, Re2, Re3 are turned on and the switching elements S1 to S6 are turned on / off to boost the DC voltage of the secondary battery Vb to charge the capacitor C2 and supply it to the inverter 12.

  Further, in the charging mode, the relays Re1 and Re2 are turned off to have the circuit configuration of FIG. 3 to rectify AC power from the external power source, and the charging current is controlled using the reactor L3 as the step-down reactor. Specifically, assuming that the voltage of the external power supply is a single-phase Vsin ωt (V is a voltage amplitude, ω is an angular frequency, and t is a time), the voltage across the terminals of the reactor L1 with respect to the external power supply, and the switching element The switching elements S1 to S4 are turned on and off so that the voltage between the terminals of the reactor L2 with respect to the connection node side of S3 and S4 becomes 1/2 Bcos (ωt) (B is a voltage amplitude). A voltage larger than the voltage amplitude between the electrodes of the external power supply is applied to the capacitor C2 by the induced electromotive force of the reactors L1 and L2. When switching element S5 is turned off and switching element S6 is turned on, a current flows from the positive electrode of secondary battery Vb to switching element S6 via reactor L3. When switching element S6 is turned off in this state, an induced electromotive force is generated in reactor L3. At this time, when the voltage obtained by adding the induced electromotive force of the reactor L3 to the output voltage of the secondary battery Vb is smaller than the terminal voltage of the capacitor C2, the capacitor C1 is switched from the capacitor C2 through the reactor L3 by turning on the switching element S5. And the electric current flows into the secondary battery Vb, and the secondary battery Vb is charged.

  As described above, the reactor L3 in the circuit of FIG. 1 functions as a step-down reactor in the charging mode similarly to the reactor L3 in the circuit of FIG. 3, but in this embodiment, the reactors L1 to L3 in FIG. Is characterized in that a two-phase coupled magnetic reactor around which an auxiliary coil is wound is used.

  4A to 4C show the configurations of reactors L1 to L3 in FIG. 4A and 4B are basic two-phase magnetically coupled reactor structures, which are magnetically coupled reactors disclosed in Non-Patent Documents 2 and 3. FIG. As shown in FIG. 4A, a core piece having an E-shaped cross-section, that is, a core piece formed with three convex portions separated by a predetermined interval is arranged so that the convex portions face each other. 50, and the convex portions of the core pieces facing each other are defined as the first leg portion 50a, the second leg portion 50b, and the third leg portion 50c, which are the two leg portions of the core structure as shown in FIG. 4B. By forming the reactors L1 and L2 on the one leg 50a and the second leg 50b, the independent magnetic flux 101 generated by the reactor L1, the independent magnetic flux 102 generated by the reactor L2, and the two reactors L1 and L2 interfere with each other. Interference magnetic flux 110 is generated and is magnetically coupled.

  In addition to such a configuration, in this embodiment, as shown in FIG. 4C, a reactor L3 as an auxiliary coil is formed on the remaining third leg portion 50c of the two-phase magnetically coupled reactor. The reactor L3 is not provided separately from the two-phase magnetic coupling reactors of the reactors L1 and L2, but can be reduced in cost by being formed on the legs of the two-phase magnetic coupling reactor in this way.

  Even if the reactor L3 is formed as a two-phase magnetically coupled reactor in this way, the circuit operation of FIG. 1 is not affected. The reason is that the boosting mode of the boosting converter shown in FIG. 1 operates when the mounted vehicle is driven, while the charging mode from the external power supply operates when the mounted vehicle is stopped. And since the electric power at the time of charging in charge mode only needs to be 1/2 or less of the boosted electric power, there is no problem even if reactors L1, L2 and reactor L3 are operated simultaneously during charging.

  Thus, by setting it as the structure which adds the reactor L3 to a two-phase magnetic coupling reactor, it becomes possible to form three reactors by one component, and cost reduction and size reduction are achieved. This is because the volume increase of the two-phase magnetically coupled reactor itself is merely the increase of the reactor L3.

  FIG. 5 shows a circuit configuration of a multiphase boost converter for a vehicle in another embodiment. In FIG. 1, the home power supply is a single-phase AC100V, but in FIG. 5, the external power supply is a three-phase (3Φ) AC200V.

  The positive terminal of the switching element S1, the positive terminal of the switching element S3, and the positive terminal of the switching element S5 are connected in parallel to the positive side of the secondary battery Vb via the reactor L4, the relay Re8 and the switch S7. The negative electrode side terminal of the switching element S2, the negative electrode side terminal of the switching element S4, and the negative electrode side terminal of the switching element S6 are connected in parallel to the negative electrode side of the secondary battery Vb. The other terminal of the switching element S1 and the other terminal of the switching element S2 are connected in series, the other terminal of the switching element S3 and the other terminal of the switching element S4 are connected in series, and the other terminal of the switching element S5 The other terminal of the switching element S6 is connected in series. Further, the positive terminal of the capacitor C1 is connected in parallel with the switching elements S1 to S6 via the reactor L4, the relay Re8, and the switch S7 on the positive electrode side of the secondary battery Vb, and the negative terminal of the capacitor C1 has a resistor R1. To the negative electrode side of the secondary battery Vb. Switching element S8 is connected between switching element S7 and the negative electrode of secondary battery Vb.

  Further, the relay Re1 and the reactor L1 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S3 and the switching element S4. In parallel with this, the relay Re2 and the reactor L2 are connected in series between the positive electrode side of the secondary battery Vb and the connection node between the switching element S1 and the switching element S2. Further, in parallel with this, the relay Re3 and the reactor L3 are connected in series between the positive electrode side of the secondary battery Vb and the connection node of the switching element S5 and the switching element S6. Outlet (power plug) 10 connected to a household power supply (3-phase AC200V) is connected between relay Re1 and reactor L1, between relay Re2 and reactor L2, and between relay Re3 and reactor L3. .

  The positive terminal of the capacitor C1 is connected to the positive terminal of the capacitor C2 via the relay Re4, the relay Re5, and the resistor R2 connected in parallel. The negative electrode side terminal of the capacitor C2 is connected to the negative electrode side terminal of the capacitor C2 through the resistor R1 and the relay Re6 which are connected in parallel to each other and via the relay Re7. Capacitor C2 is connected to inverter 12.

  In comparison with the circuit configuration of FIG. 9, the boost converter has three phases corresponding to the power source having three phases, and a circuit indicated by reference numeral B in FIG. 5 is newly added. That is, the circuit B includes a reactor L4, a relay Re8, and switching elements S7 and S8. The relay Re8 and the reactor L4 are connected in series, and one end of the reactor L4 is connected to the positive electrode of the secondary battery Vb. One end of the relay Re8 is connected to the other end of the reactor L4, and the other end of the relay Re8 is connected to a connection node between the switching element S7 and the switching element S8.

  In such a configuration, when functioning in the charging mode, the relays Re1, Re2, Re3, Re4, Re5, and Re7 are turned off and the relays Re6 and Re8 are turned on. Then, the switching element S7 and the switching element S8 are turned on and off to cause the reactor L4 to function as a step-down reactor and suppress the current ripple that degrades the life of the secondary battery Vb, thereby discharging the accumulated charge of the capacitor C1. To charge the secondary battery Vb.

  Also in the configuration of FIG. 5, as the reactors L <b> 1 to L <b> 4, a separate reactor is not used, but a three-phase coupled magnetic reactor wound with an auxiliary coil is used.

  6A to 6C show the configurations of reactors L1 to L4 in FIG. 6A and 6B show the basic three-phase magnetically coupled reactor structure. As shown in FIG. 6A, the core structure 52 is composed of two core pieces facing each other, and the first leg portion 52a to the fifth leg portion 52e of the core structure 52 are formed. As shown in FIG. 6B, the reactors L1, L2, and L3 are formed on the first leg part 52a, the third leg part 52b, and the fifth leg part 52c, which are the three legs of the core structure 52, and are generated by the reactor L1. An independent magnetic flux 101, an independent magnetic flux 102 generated by the reactor L2, a magnetic flux 103 generated by the reactor L3, and an interference magnetic flux 112 generated by the interference of the three reactors L1, L2, and L3 exist and are magnetically coupled. ing.

  In addition to such a configuration, in this embodiment, as shown in FIG. 6C, a reactor L4 as an auxiliary coil is connected to the second leg 52d and the fourth leg 52e, which are the remaining legs of the three-phase magnetically coupled reactor. Form. The reactor L4 is not provided separately from the three-phase magnetic coupling reactors of the reactors L1, L2, and L3, but can be reduced in cost by being formed on the legs of the three-phase magnetic coupling reactor in this way.

  In FIG. 6C, two reactors L4 are formed on each of the second leg 52d and the fourth leg 52e, which are the two legs of the core structure 52, for a total of two, but only one reactor L4 is 1 You may form in one leg part, for example, the 2nd leg part 52d. In the configuration of FIG. 6C, two reactors L4 may be connected in series in addition to being connected in parallel.

  Also in this three-phase magnetically coupled reactor, the step-down reactor L4 can also function as a transformer, like the two-phase magnetically coupled reactor. For example, reactors L4-1 and L4-2 are formed on the second leg portion 52d and the fourth leg portion 52e, and the reactors L4-1 and L4-2 are opposed to each other as shown in FIG. It can be made to function as a transformer by forming a magnetic path that does not intersect the step-up coil by being formed in the shape of a coil.

  Thus, in this embodiment, when the external power source is a single phase, the remaining legs of the reactors L1 and L2 in which the reactors of the two-phase magnetically coupled reactors are not yet formed, that is, the magnets that are not yet formed. By forming the third reactor in the road portion, the two-phase magnetic coupling type is substantially maintained, and when the external power source is three-phase, the three-phase magnetic coupling reactors of the reactors L1, L2, and L3 By forming the fourth reactor L4 in the remaining leg portion where the reactor has not yet been formed, that is, the magnetic path portion where the reactor has not yet been formed, a substantially three-phase magnetic coupling type can be maintained. Cost reduction and size reduction can be achieved. In the present embodiment, for example, in the configuration of FIG. 4C, the boost current is about 50 A or more per reactor of the reactors L1 and L2 (when the power of the secondary battery Vb is 200 V and 20 kW), but as an auxiliary coil Reactor L3 is about 30 A (in the case of maximum charging power 6 kW, 200 V) and is smaller on the auxiliary coil side, so that an auxiliary coil can be provided while minimizing an increase in reactor capacity.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various change is possible.

  For example, the reactor L3 as an auxiliary coil formed on the leg portion of the two-phase magnetically coupled reactor in the present embodiment can be used for other purposes. That is, reactor L3 can not only function as a step-down converter in the charging mode in FIG. 1 but also function as a smoothing reactor at the output stage of a step-down converter that forms, for example, 200V to 12V in a hybrid vehicle. Or it can be made to function as a transformation reactor of other voltage conversion converters, and it is made to function as a reactor of a voltage conversion converter of a storage capacitor other than a battery and a battery as an example. Or it can be made to function as a transformation reactor of a circuit which carries out voltage conversion for in-vehicle auxiliary machinery. Alternatively, it is possible to function as a transformer of a circuit for converting voltage for on-vehicle auxiliary equipment. FIG. 8 shows a configuration of a two-phase magnetically coupled reactor in the case where the reactor L3 as the auxiliary coil functions as a transformer. The leg part 50c of the core structure 50 is formed into a U-shaped structure, and the reactor L3-1 is formed on one of the U-shaped leg parts, and the reactor L3-2 is formed on the other U-shaped leg part 50c opposite to the reactor L3-1. Since the magnetic path formed by the reactor L3-1 and the reactor L3-2 does not intersect with the step-up coil, a transformer can be constituted by the reactor L3-1 and the reactor L3-2, and voltage conversion can be performed for on-vehicle auxiliary equipment. Even in this case, the increase in volume is only the reactors L3-1 and L3-2, and the increase in volume can be suppressed to a minimum. The in-vehicle auxiliary equipment includes an in-vehicle ECU, a headlight, a room lamp, a power window, a horn, a blinker, a radiator fan, an electric water pump, a battery cooling fan, and the like.

  10 outlets, 12 inverters, L1-L4 reactors, C1, C2 capacitors, Re1-Re8 relays.

Claims (8)

A boost mode and a charge mode that can be switched to each other are provided. In the boost mode, the voltage of the secondary battery is boosted by a boost reactor, and in the charge mode, AC power from an external power source is rectified and stepped down by a step-down reactor. A vehicular multi-phase boost converter for charging the secondary battery,
The external power source is a single-phase power source,
The step-up reactor forms a two-phase magnetically coupled reactor by forming two reactors in the core structure, and the step-down reactor is formed in a magnetic path portion where the step-up reactor is not formed in the core structure. Thus, the step-up reactor and the step-down reactor are both formed in the same core structure. The multi-phase boost converter for a vehicle according to claim 1,
The core structure is configured by arranging core pieces including first, second, and third convex leg portions that are sequentially formed at positions separated by a predetermined interval, to face each other,
The step-up reactor is formed on the first and third convex leg portions, and the step-down reactor is formed on the second convex leg portion. The multi-phase boost converter for a vehicle according to claim 2,
The step-down reactor includes a first step-down reactor and a second step-down reactor that are independently formed on the second convex leg of each of the pair of core pieces, and the first step-down reactor and the second step-down reactor. Functions as a transformer for voltage conversion, and is a multi-phase boost converter for vehicles. A boost mode and a charge mode that can be switched to each other are provided. In the boost mode, the voltage of the secondary battery is boosted by a boost reactor, and in the charge mode, AC power from an external power source is rectified and reduced by a step-down reactor. A vehicular multi-phase boost converter for charging the secondary battery,
The external power source is a three-phase power source,
The step-up reactor forms a three-phase magnetically coupled reactor by forming three reactors in the core structure, and the step-down reactor is formed in a magnetic path portion where the step-up reactor is not formed in the core structure. Thus, the step-up reactor and the step-down reactor are both formed in the same core structure. The multi-phase boost converter for a vehicle according to claim 4,
The core structure is configured by arranging core pieces including first, second, third, fourth, and fifth convex leg portions that are sequentially formed at positions separated by a predetermined interval so as to face each other.
The step-up reactor is formed on the first, third, and fifth convex legs, and the step-down reactor is formed on at least one of the second or fourth convex legs. Multi-phase boost converter for vehicles. The multi-phase boost converter for a vehicle according to claim 5,
The step-down reactor includes a first step-down reactor and a second step-down reactor that are independently formed on the second and fourth convex legs of each of the pair of core pieces, and the first step-down reactor and the first step-down reactor, A multi-phase boost converter for a vehicle, wherein the two step-down reactor functions as a voltage conversion transformer. The multi-phase boost converter for a vehicle according to claim 5,
The step-down reactor is formed on the second and fourth convex legs and connected in series with each other, and is a multiphase boost converter for vehicles.   The step-down reactor is formed on the second and fourth convex legs and is connected in parallel to each other.

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