JP2013034279A - Multi-phase converter circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a device configuration and allow power transmission/reception between an external power-supply and a secondary battery at a low cost.SOLUTION: A primary-side inductor 103 is added to a step-up reactor in a step-up converter circuit that steps up a DC voltage from a secondary battery 14 and supplies the voltage to a driving circuit 20, and an AC voltage is supplied to the primary-side inductor 103 from an external power-supply via a PFC circuit 106 and a DC/AC conversion circuit 108. By adjusting the phase of the AC voltage, a voltage across an output capacitor C2 is stepped up, and the secondary battery 14 is charged by passing a DC current from the output capacitor C2 to the secondary battery 14. Further, by changing the phase of the AC voltage, power is supplied from the secondary battery 14 to the external power-supply.

Description

  The present invention relates to a multi-function multi-phase converter circuit, and more particularly to a converter circuit that exchanges power with the outside.

  2. Description of the Related Art Power converters (converter circuits) that increase and decrease circuit voltage in power circuits are widely used. For example, mounting on electric vehicles such as hybrid vehicles, electric vehicles, and fuel cell vehicles is being studied. Further, a circuit configuration has been proposed in which another circuit is added to such a converter circuit and insulation type charging or power generation can be performed with an external power source.

  FIG. 14 shows a basic example of such a circuit configuration. A secondary battery and a converter circuit mounted on a hybrid vehicle or the like are separately configured from a bidirectional PFC circuit and an insulated DC-DC converter, and an external power source is connected to the bidirectional PFC circuit.

  Patent Document 1 below describes a multi-phase converter mounted on a vehicle having an external charging function for the purpose of downsizing the apparatus scale.

  15 and 16 show the configuration of this conventional multiphase converter. In FIG. 15, the hybrid vehicle drive system 10 includes a switchable three-phase multiphase converter 12 and charges the secondary battery 14 based on electric power acquired from an external power supply device such as a commercial power supply. The output voltage is boosted and output to the drive circuit 20. In addition, a drive circuit 20, a drive motor 22, and a power generation motor 24 that perform DC / AC conversion and transfer power between the switchable three-phase multiphase converter 12, the drive motor 22, and the power generation motor 24 are provided. The switchable three-phase multi-phase converter 12 has a configuration in which an inductor is connected to a connection node of switching elements connected up and down, and a power acquired from a boost mode for boosting the output voltage of the secondary battery 14 or an external power supply device. In the external charging mode for charging the secondary battery 14 based on the above. In the external charging mode, the controller 28 controls the relay switches RS1 to RS4 to be off. Single phase power plug 26 is plugged into a single phase power outlet. One electrode of the single-phase power plug 26 is connected to one end of the inductor L1 on the relay switch RS1 side, and the other electrode of the single-phase power plug 26 is connected to one end of the inductor L2 on the relay switch RS2 side.

  A single-phase AC voltage is applied from the single-phase power plug 26 via the inductors L1 and L2 between the connection node A of the switching elements S1 and S2 and the connection node B of the switching elements S3 and S4. The controller 28 operates the switching elements S1 to S4 as a single-phase inverter, performs PWM control of the switching elements, rectifies and boosts the AC voltage between the connection nodes, and applies the DC voltage obtained thereby to the output capacitor 18. . Next, when switching element S6 is turned on and switching element S5 is turned off, a current flows from the positive electrode of secondary battery 14 to switching element S6 via inductor L3. When the switching element S6 is turned off in this state, an induced electromotive force is generated in the inductor L3. At this time, when the voltage obtained by adding the inductor L3 to the output voltage of the secondary battery 14 is smaller than the voltage across the terminals of the output capacitor 18, the switching element S5 is turned on to input from the output capacitor 18 via the inductor L3. The capacitor 16 and the secondary battery 14 are charged. In this configuration, the inductors L1 and L2 used as boosting inductors in the boosting mode can be used as power factor improving and boosting inductors in the external charging mode, and are used as boosting inductors in the boosting mode. The inductor L3 can be used as a step-down inductor in the external charging mode.

  On the other hand, in FIG. 16, the hybrid vehicle drive system 44 includes a switchable six-phase multiphase converter 46. In the external charging mode, the controller 48 controls the relay switches SW1 to SW4, SW6, and SW7 to be off and controls SW5 to be on. The single-phase power plug 26 is connected to one end of the inductor L1 on the relay switch SW1 side, and the other electrode of the single-phase power plug 26 is connected to one end of the inductor L2 on the relay switch SW2 side. The controller 48 operates the switching elements S1 to S4 as a single-phase inverter, thereby rectifying and boosting the AC voltage between the connection nodes A and B, and applying the DC voltage after rectification and boosting to the output capacitor 18-1. Apply. A primary inductor L3 + L4 is connected between a connection node D of the switching elements S5 and S6 and a connection node E of the switching elements S7 and S8. A secondary inductor L5 + L6 is connected between a connection node F of the switching elements S9 and S10 and a connection node G of the switching elements S11 and S12.

  The controller 48 operates the switching elements S5 to S8 as a single-phase inverter, performs PWM control of the switching elements S5 to S8, converts the voltage between the terminals of the output capacitor 18-1 into an AC voltage, and converts the AC voltage to the primary side. Applied to inductor L3 + L4. Due to the magnetic coupling between the primary side inductor L3 + L4 and the secondary side inductor L5 + L6, an AC voltage is generated on the secondary side L5 + L6, and the AC voltage is applied between the connection nodes F and G.

  The controller 48 operates the switching elements S9 to S12 as a single-phase inverter, performs PWM control of the switching elements S9 to S12, and rectifies the AC voltage applied between the connection nodes F and G from the secondary inductor L5 + L6. Then, the DC voltage after rectification is applied to the output capacitor 18-2, the input capacitor 16, and the secondary battery 14 to charge the secondary battery 14.

  In this configuration, the front stage side and the rear stage side are coupled and electrically insulated based on the magnetic coupling of the primary side inductor L3 + L4 and the secondary side inductor L5 + L6.

JP 2010-220443 A

  However, the basic example shown in FIG. 14 requires a plurality of switching elements, specifically, twelve switching elements and a high-frequency transformer as an attachment circuit. is there.

  In the configuration shown in FIG. 15, the inductor used as the boosting inductor in the boosting mode can be used as the power factor improving inductor and the boosting inductor in the external charging mode. Therefore, the number of components is reduced in this portion. Although the insulation property is not ensured and the insulation property is ensured in the configuration of FIG. 16, the number of newly added relays is still relatively large at 7 and the number of phases of the booster circuit is also high. As many as six phases, it is difficult to reduce the cost.

  An object of the present invention is to provide a multiphase converter circuit capable of reducing the size and cost of an apparatus while ensuring insulation with an external power supply.

  The multi-phase converter circuit of the present invention includes a multi-phase boost reactor that boosts a DC voltage from a secondary battery, and an inductor that is magnetically coupled to the multi-phase boost reactor, and receives an AC voltage from an external power source. And an inductor to be applied, and adjusting the phase of the AC voltage to supply electric power between the external power source and the secondary battery via the multi-phase boost reactor.

  In one embodiment of the present invention, the phase of the AC voltage V1 from the external power supply is shifted by 90 degrees with respect to the boosted voltage V2 of the multi-phase boost reactor that boosts the DC voltage from the secondary battery. Supply to the inductor.

  In another embodiment of the present invention, the phase difference of the AC voltage V1 from the external power supply is 90 degrees with respect to the boosted voltage V2 of the multiphase boost reactor that boosts the DC voltage from the secondary battery. As a result, the power is supplied from the external power source to the secondary battery as the phase difference of the AC voltage V1 from the external power source as -90 degrees. Power is supplied to the external power source.

  In still another embodiment of the present invention, a second inductor for current limiting connected in series to the inductor is provided.

  In still another embodiment of the present invention, the multi-phase boost reactor is configured by directly connecting two magnetically coupled reactors of reverse coupling and forward coupling, and the inductor is the reverse coupling of the multi-phase boost reactor. The magnetic coupling reactor is added and magnetically coupled.

  In still another embodiment of the present invention, the inductor has a neutral point, and a first switching element is connected to one end of the inductor and a second switching element is connected to the other end. The other end of the first switching element and the other end of the second switching element are connected to each other, and the electric power from the external power source is connected to the neutral point and the connection node of the first switching element and the second switching element. Supplied during.

  According to the present invention, it is possible to reduce the size and cost of the apparatus while ensuring insulation with an external power source. In particular, according to the present invention, since the step-up reactor can be used as a transformer, it is not necessary to use a separate transformer. In other words, the step-up reactor can function as a charging unit from an external power source or a part of a power generation unit to the external power source, so that the apparatus can be reduced in size and cost.

It is a basic circuit diagram of an embodiment. FIG. 2 is an equivalent circuit diagram of FIG. 1. It is a waveform of V1, V2, and i2 of embodiment, and phase explanatory drawing. It is a specific basic circuit diagram which is a premise of the embodiment. It is a specific circuit diagram of an embodiment. FIG. 6 is an equivalent circuit diagram of FIG. 5. It is a graph which shows the simulation result of an electric current change. It is a graph which shows the simulation result of a battery current. It is a structure and circuit diagram of a magnetic coupling type boosting reactor. It is a block diagram of the magnetic coupling type | mold boost reactor which added the primary side inductor of embodiment. FIG. 11 is an equivalent circuit diagram using the magnetically coupled boost reactor of FIG. 10. It is a circuit diagram of other embodiments. FIG. 15 is an explanatory diagram for comparing the circuit shown in FIG. 12 with the conventional circuit shown in FIG. 14. It is a circuit diagram of a prior art. It is a circuit diagram of a prior art. It is a circuit diagram of a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The multi-phase converter circuit of the present embodiment is preferably mounted on an electric vehicle such as a hybrid vehicle, an electric vehicle, and a fuel cell vehicle, and is used for power supply between the in-vehicle secondary battery and the motor. It is not limited to this.

<Basic configuration and basic principle>
First, the basic configuration and basic principle of this embodiment will be described.

  FIG. 1 shows a circuit configuration of a multiphase converter circuit in the present embodiment. The multi-phase converter circuit 100 boosts the output voltage of the secondary battery 14 and outputs the boosted voltage to the drive circuit 20, in addition to an external charging mode for charging the secondary battery 14 based on power acquired from an external power source, Furthermore, an external power generation mode for outputting electric power to the outside is provided.

  The multiphase converter circuit 100 has a basic configuration of a two-phase boost converter in which an inductor is connected to a connection node of switching elements connected vertically, and is configured by further adding an inductor 103 to the two-phase boost converter. An input capacitor C1 is connected in parallel to both ends of the secondary battery 14. One end of each of the inductors 101 and 102 is connected to the positive electrode of the secondary battery 14. The other end of the inductor 101 is connected to the connection node of the switching elements S1 and S2, and the other end of the inductor 102 is connected to the connection node of the switching elements S3 and S4. The other ends of the switching elements S1 and S3 are connected to one end of the output side capacitor C2, and the other ends of the switching elements S2 and S4 are connected to the other end of the output side capacitor C2. The output side capacitor C2 is connected to the drive circuit 20.

  The operation of the switching elements S1 to S4 is the same as the conventional one. A controller (not shown) (which may be the same as the controller 28 in FIG. 15) operates the switching elements S1 to S4 as a single-phase inverter and performs PWM control on the switching elements. The AC voltage is rectified and boosted between the connection nodes, and the DC voltage obtained thereby is applied to the output capacitor C2.

  On the other hand, a primary side inductor 103 is coupled to inductors 101 and 102 constituting the boost reactor. Primary inductor 103 is connected to DC / AC conversion circuit 108. The DC / AC conversion circuit 108 is connected to the external power plug 26 via the PFC circuit 106.

  FIG. 2 shows an equivalent circuit of the inductors 101, 102, and 103 in FIG. The inductor 103 is the primary side and is indicated as inductor L1, and the inductors 101 and 102 are indicated as the secondary side and collectively indicated as inductor L3. Although not shown in FIG. 1, the inductor L1 is shown as a configuration in which an inductor L2 for limiting current fluctuation is added. The coupling rate k of the transformer composed of the inductors 101, 102, and 103 in FIG.

であり、相互インダクタンスは、

である。但し、上記のようにｋは１とする。 In FIG. 2, when the primary current flowing through the inductors L1 and L2 is i1, the secondary current flowing through the inductor L3 is i2, the primary voltage is V1, and the secondary voltage is V2, the current change rate is

And the mutual inductance is

It is. However, k is 1 as described above.

  In FIG. 1, when the upper and lower arms composed of the switching elements S1 to S4 are driven at a duty ratio of about 50% by shifting the phase by 180 degrees, the waveform of the secondary side voltage V2 is a rectangle as shown in FIG. It becomes a waveform. The boosting ratio of the boosting reactor is doubled, the voltage at the connection node of the switching elements S1 to S4 is Vb, which is always the same as the voltage of the secondary battery 14, and no direct current to the secondary battery 14 is generated. Further, when only V2 is applied to the secondary side inductor L3, no electric power is generated because the phase of the secondary side current i2 and the secondary side voltage V2 are shifted by 90 degrees. That is, when integration of the secondary current i2 and the secondary voltage V2 is performed in one cycle, power = 0.

  On the other hand, when the primary voltage V1 has a rectangular waveform with a duty ratio of about 50% and is applied with a phase difference of 90 degrees with respect to V2 as shown in FIG. 3B, FIG. As shown, the phase difference between the secondary current i2 and the secondary voltage V2 is 45 degrees, and power is generated. FIG. 3 (d) shows the current i2 on the secondary side and its time change di2 / dt. On the other hand, when the phase of V1 is applied to V2 with a phase difference of −90 degrees, power is generated with the sign reversed from that of 90 degrees. This means that the amount of power can be controlled from charging to power generation by changing the phase of V1 from -90 degrees to +90 degrees. That is, by coupling the inductor 103 to the inductors L101 and 102 in FIG. 1, power can be transferred from the primary side to the secondary side (charging) or from the secondary side to the primary side (generated power).

  Further, in the case of charging, the secondary power is stored in the capacitor C2 in FIG. 1, and the voltage between the terminals of the capacitor C2 is boosted. Then, a direct current for charging the secondary battery 14 flows through the boost converter. Although the current oscillates, it finally becomes balanced when the amount of power transmitted through the transformer becomes equal to the amount of power by DC.

<Specific configuration>
Next, a specific configuration in the present embodiment will be described.

  FIG. 4 shows a basic circuit configuration in the present embodiment. The multi-phase converter circuit is a magnetic coupling type in which two magnetic coupling reactors of a forward coupling and a reverse coupling are directly coupled. That is, the first inductor and the second inductor are connected in series between the positive electrode side of the secondary battery 14 and the connection node of the switching elements S1 and S2, and the positive electrode side of the secondary battery 14 is switched with the positive electrode side. Between the connection nodes of the elements S3 and S4, the third inductor and the fourth inductor are connected in series with each other. The first inductor and the third inductor are reversely coupled, and the second inductor and the fourth inductor are forward-coupled. Assuming that the mutual inductance of the reverse coupling is M1 and the mutual inductance of the forward coupling is M2, the boost reactor inductance L = M1 + M2 (strong coupling is assumed, and the leakage inductance is ignored). The other ends of the switching elements S1 and S3 are connected to one end of the output side capacitor C2, and the other ends of the switching elements S2 and S4 are connected to the other end of the output side capacitor C2. The output side capacitor C2 is connected to the drive circuit 20.

  FIG. 5 shows a circuit configuration of the multi-phase converter circuit 200 of the present embodiment. In the circuit configuration shown in FIG. 4, a primary inductor 103 is added to the reverse coupling portion of the boost reactor, and a current limiting inductor L <b> 2 is connected to the primary inductor 103. The primary inductor 103 is connected to the external power plug 26 via the AC / AC conversion circuit 109. The AC / AC conversion circuit 109 is a circuit that converts commercial AC power into high-frequency power of 10 kHz.

  FIG. 6 shows a case where a rectangular wave of 400 V and 10 kHz is set as the output voltage of the AC / AC conversion circuit 109. In FIG. 6, the inductance of the primary inductor 103 is 242 μH, L2 = 80 μH, the reverse coupling inductance is 242 μH, and the forward coupling inductance is 94 μH. FIG. 7 shows the result of computer simulation of the operation of FIG. Note that a rectangular wave of 10 kHz is applied to the secondary side as in the primary side. In FIG. 7, the graph a shows the current change of the primary current i1, and the current change rate calculated by the above equations (1) and (2) is 9.06 A / μS, whereas the simulation result is 9.29 A. / ΜS. Graph b shows the current change of the secondary current i2. The current change rate calculated by the above equations (1) and (2) is 5.2 A / μS, whereas the simulation result is 5.24 μS. is there. The calculation results and simulation results agree well. This means that the equivalent circuit of FIG. 2 from which the numbers (1) and (2) are based is correct.

  The AC power is transmitted to the output capacitor C2 via the transformer. The boost converter is set to double boost, and when AC power is supplied in this state, the output capacitor C2 becomes higher than twice the battery voltage Vb of the secondary battery 14. When the voltage between the terminals becomes higher than twice the battery voltage Vb, the average voltage battery voltage Vb on the driving side becomes higher, so that a direct current to the battery side is generated in the boost reactor, and the secondary battery 14 uses AC power as DC power. To store electricity. When the DC power amount and the AC transmission power amount are equal, equilibrium is reached, and the voltage across the terminals of the output capacitor C2 is also stabilized at twice the battery voltage Vb.

  FIG. 8 shows the result of a computer simulation of the change in battery current over time when AC power to be transmitted is applied stepwise from 0 kW to 10 kW. DC current eventually converges to a constant value while vibrating. The battery current (shown as “Sim.” In the figure) in the equilibrium state in the simulation is 32.8A, which is in good agreement with the calculated value of 33.23A.

  Here, as described above, if the phase of the input rectangular wave voltage is shifted 180 degrees from the charged state, power is generated instead of charging. In the case of power generation, a battery current in the opposite direction to charging is generated.

  In FIG. 4, the primary side inductor is added to the reverse coupling reactor in the reverse coupling and forward coupling boosting reactor, but the forward coupling may be an independent reactor.

  FIG. 9 shows a configuration and a circuit diagram of a step-up reactor when the forward coupling reactor is an independent reactor. FIG. 9A is a configuration diagram of the magnetic coupling reactor, and FIG. 9B is a circuit diagram. The magnetically coupled reactor 300 includes a core piece having an E-shaped cross section, that is, core pieces 300a and 300b formed with three convex portions separated by a predetermined interval so that the convex portions face each other. By forming the inductor L on the two legs of the core structure, there is an independent magnetic flux generated by the inductor L and an interference magnetic flux generated by the interference of the two inductors. Yes. In FIG. 9B, a first inductor and a second inductor are connected in series between the positive electrode side of the secondary battery 14 and the connection node of the switching elements S1, S2, and the secondary battery 14 A third inductor and a fourth inductor are connected in series with each other between the positive electrode side and the connection node of the switching elements S3 and S4. The first inductor and the third inductor are reversely coupled, and the second inductor and the fourth inductor are independent of each other.

  FIG. 10 shows a configuration of a magnetic coupling reactor in which a primary inductor 103 is added to the magnetic coupling reactor of FIG. Similarly to the magnetically coupled reactor 300 shown in FIG. 9A, the magnetically coupled reactor 400 is a core piece having an E-shaped cross section, that is, a core piece 400a formed with three convex portions separated by a predetermined interval. , 400b are arranged so that the convex portions face each other, and a core structure is formed, and an inductor L is formed on two legs of the core structure. Further, the primary side inductor 103 is formed in each of the two legs where the inductor L is formed. Accordingly, the primary inductor 103 is coupled to the reversely coupled inductor, and charging and power generation are possible by changing the phase of the input rectangular wave voltage as in the case of FIG. However, in this configuration, the independent inductor L is connected to the secondary side instead of the primary side.

  FIG. 11 shows an equivalent circuit when the magnetically coupled reactor 400 of FIG. 10 is used. Compared to the case of FIG. 6, the inductor L2 is not connected to the primary side, and instead, the secondary side, that is, between the connection node of the reverse coupling inductor Lr and the switching elements S1 and S2, and the reverse coupling inductor Lr It can be seen that the independent inductor L is connected between the connection nodes of the switching elements S3 and S4. Incidentally, in the case of FIG. 6, the inductor L2 is connected to the primary side to limit the current, and since the inductance value of the inductor L2 is on the primary side, it can be set relatively small. Can handle a lot of power. Therefore, for example, charging / discharging up to 50 kW is possible, and so-called rapid charging can be handled.

  Finally, the DC / AC conversion circuit 108 in FIG. 1 will be described. As the DC / AC conversion circuit 108, a full-bridge single-phase inverter can be used as in the prior art shown in FIG. 13, but as described above, a large number of switching elements and transformers are required. In order to reduce the size, the driving frequency is about 100 kHz, so that it is necessary to use a MOSFET as a switching element. The on-resistance of the MOSFET tends to increase significantly as the breakdown voltage increases.

  On the other hand, in this embodiment, as shown in FIG. 12, a neutral point is provided in the primary inductor 103, and two switching elements S10 and S11 are connected to both ends thereof. A PFC circuit 106 is connected to the neutral point. Specifically, the connection node of the primary side inductor 103 is one end of the neutral point (-terminal in the figure), the switching element S10 is connected to one end of the primary side inductor 103, and the other end of the primary side inductor 103 is connected to the other end. Switching element S11 is connected. The connection node between the switching elements S10 and S11 is the other end of the neutral point (+ terminal in the figure), the positive side of the output of the PFC circuit 106 is connected to the positive side of the neutral point, and the negative side of the output of the PFC circuit 106 Is connected to the-side of the neutral point. In the present embodiment, since the primary side inductor is added to the boost reactor of the boost converter without newly adding a separate transformer, it is necessary to set the drive frequency to about 100 kHz in order to reduce the size of the transformer. There is no problem even if the drive frequency is about 10 kHz. In this case, it is possible to use IGBTs instead of MOSFETs as the switching elements S10 and S11. The withstand voltage of the IGBT is generally about 1200 V, and when the DC voltage is set to 400 V at the maximum, the voltage applied to the switching elements S10 and S11 becomes a surge voltage of 800 V, so it is sufficient to use an IGBT with a withstand voltage of 1200 V Is possible.

  Therefore, when the conventional configuration shown in FIG. 14 is compared with the configuration of the present embodiment shown in FIG. 12, the conventional circuit configuration requires 12 MOSFETs, a capacitor, and a transformer. 4 elements, IGBT 2 elements, a capacitor, and a primary inductor, the number of switching elements can be halved from 12 elements to 6 elements, and a transformer can be omitted.

  FIG. 13 shows a comparison between the circuit configuration of the present embodiment shown in FIG. 12 and the conventional circuit configuration shown in FIG. The conventional external power plug 26 and the PFC circuit are the same as the external power plug 26 and the PFC circuit in the present embodiment, but the conventional DC / AC conversion circuit corresponds to the two switching elements and the primary inductor in the present embodiment. The conventional secondary circuit corresponds to the boost converter circuit including the boost reactor in the present embodiment. No elements are added to the step-up converter, and the DC / AC conversion circuit and the transformer are replaced with an inductor and two switching elements. Conventionally, three functional blocks of a bidirectional PFC circuit portion, a DC / AC conversion circuit portion, and a transformer portion are separately attached. In this embodiment, the bidirectional PFC circuit portion, the inductor and the switching element portion It will be appreciated that only two functional blocks need be added.

  As described above, in the present embodiment, an inductor is added to a boost reactor of a boost converter of a hybrid vehicle or the like, and AC power is supplied to the inductor from an external power source, thereby charging the secondary battery 14 or A power generation function from the secondary battery 14 can be added. In this embodiment, the boost converter is multi-functionalized by adding a function of charging the secondary battery 14 from the external power source or a function of generating power from the secondary battery 14 to the external power source with the aid of the boost reactor of the boost converter. It can be said that. In addition, the inductor added to the boost reactor of the boost converter is magnetically coupled, and insulation is also ensured.

  In this embodiment, an AC power supply is shown as an external power supply, and an AC voltage is supplied from the AC external power supply to the inductor 103 via the PFC circuit 106 and the DC / AC conversion circuit 108. However, the external power supply is a DC power supply. The AC voltage may be supplied to the inductor 103 from the DC power source via the DC / AC conversion circuit 108.

  The multi-phase converter circuit according to the present embodiment is particularly suitable for a plug-in hybrid vehicle that boosts a DC voltage from a secondary battery and supplies the boosted DC voltage to a motor and charges the secondary battery with AC power from an external power source. However, the present invention is not limited to this.

  14 secondary battery, 20 drive circuit, 26 external power plug, 106 PFC circuit, 108 DC / AC conversion circuit, 100 multi-phase converter circuit, 101, 102 inductor, 103 primary inductor.

Claims (7)

A multi-phase boost reactor that boosts the DC voltage from the secondary battery;
An inductor that is magnetically coupled to the multi-phase boost reactor, to which an AC voltage from an external power source is applied;
A multi-phase converter circuit comprising: supplying electric power between the external power source and the secondary battery via the multi-phase boost reactor by adjusting a phase of the AC voltage. The multi-phase converter circuit according to claim 1.
The phase of the AC voltage V1 from the external power supply is shifted by 90 degrees with respect to the boosted voltage V2 of the multi-phase boost reactor that boosts the DC voltage from the secondary battery, and is supplied to the inductor. Multi-phase converter circuit. The multi-phase converter circuit according to claim 2, wherein
The external power supply is supplied to the inductor by setting the phase difference of the AC voltage V1 from the external power supply to 90 degrees with respect to the boosted voltage V2 of the multiphase boosting reactor that boosts the DC voltage from the secondary battery. Power is supplied from the secondary battery to the external power supply by supplying power to the secondary battery and supplying the inductor with the phase difference of the AC voltage V1 from the external power supply set to -90 degrees. Multi-phase converter circuit. The multi-phase converter circuit according to claim 1.
A second current limiting inductor connected in series with the inductor;
A multi-phase converter circuit comprising: The multi-phase converter circuit according to claim 1.
The multi-phase boost reactor is configured by directly connecting two magnetically coupled reactors of reverse coupling and forward coupling,
The multi-phase converter circuit, wherein the inductor is added to and magnetically coupled to the reverse coupling magnetic coupling reactor of the multi-phase boost reactor. The multi-phase converter circuit according to claim 1.
The inductor has a neutral point, and a first switching element is connected to one end of the inductor and a second switching element is connected to the other end.
The other end of the first switching element and the other end of the second switching element are connected to each other,
The electric power from the external power supply is supplied between the neutral point and a connection node of the first switching element and the second switching element. The multi-phase converter circuit according to any one of claims 2 and 3,
The multi-phase boost reactor is a two-phase boost reactor, and its boost ratio is twice.
The multiphase converter circuit, wherein V1 and V2 have the same frequency.

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