JP6256050B2 - Charger - Google Patents

Description

  The present invention relates to a charging device that uses both a contact power receiving unit and a non-contact power receiving unit.

  Conventionally, there is a charging device described in Patent Document 1 as a combination of a contact power receiving unit and a non-contact power receiving unit. The charging device described in Patent Document 1 includes a contact power reception unit that is electrically connected to an AC power supply, and is magnetically coupled to a charger that converts input AC power into DC power, and a power transmission unit of the AC power supply. And a non-contact power reception unit configured to receive power from the AC power source in a non-contact manner, and the non-contact power reception unit is connected to the power conversion circuit of the charger.

International Publication No. 2010/131348

  In the charging device described in Patent Literature 1, when the power storage device is disconnected from the output terminal, it is not possible to protect against device destruction. In other words, when there is no load, further power is supplied from the primary side, or power that has gone out of place remains in the charging device, which may lead to deterioration or breakage of the charging device.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a main object of the present invention is to provide a charging device capable of protecting a circuit in the event of an abnormality in a charging device using both a contact power receiving unit and a non-contact power receiving unit. There is to do.

  The present invention is a charging device comprising a contact power receiving unit that is connected to an AC power source and to which AC power is input, and an opening / closing means, and converts the AC power input from the contact power receiving unit to be connected to an output terminal. A power conversion circuit that supplies power to the secondary battery, and a contactless power receiving unit that is connected in parallel with the contact power receiving unit, and AC power is input in a non-contact manner, and the opening / closing means is closed, It is connected so that the closed circuit to a non-contact power-receiving part may be formed through a part of power converter circuit.

  Non-contact power feeding is achieved by causing resonance to occur by matching the resonance frequency of the circuit configured by the non-contact power receiving unit and the power conversion circuit with the resonance frequency of the circuit supplying AC power to the non-contact power receiving unit. Can be done with efficiency. On the other hand, if the configuration of the non-contact power receiving circuit configured by the non-contact power receiving unit and the power conversion circuit is changed, the resonance frequency is shifted from the resonance frequency of the circuit supplying the AC power so that resonance does not occur, and power is transferred. The efficiency of is greatly reduced. By adopting the above configuration, it is possible to change the configuration of the non-contact power receiving circuit by closing the opening / closing means in the event of an abnormality such as the secondary battery coming off the output end, which can greatly reduce the power receiving efficiency. it can. Further, the power remaining in the non-contact power receiving circuit can be consumed in the closed circuit, and the power conversion circuit can be protected.

It is a circuit diagram of the charging device which concerns on 1st Embodiment. It is a circuit diagram in the case of receiving electric power from a contact electric power receiving part in 1st Embodiment. It is a circuit diagram in the case of receiving electric power from a non-contact electric power receiving part in 1st Embodiment. It is a circuit diagram at the time of performing circuit protection control in a 1st embodiment. It is a circuit diagram of the charging device which concerns on 2nd Embodiment. It is a circuit diagram in the case of receiving electric power from a contact electric power reception part in 2nd Embodiment. It is a circuit diagram in the case of receiving electric power from a non-contact electric power receiving part in 2nd Embodiment. It is a circuit diagram at the time of performing circuit protection control in 2nd Embodiment.

  Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the description of the same reference numerals is used.

<First Embodiment>
The charging device according to the present embodiment is mounted on a vehicle such as a plug-in hybrid car or an electric vehicle, and is used for charging a secondary battery that supplies power to a motor or the like that drives the vehicle.

  FIG. 1 is a circuit diagram of the charging apparatus according to the present embodiment. The charging device includes a contact power receiving unit 10, a non-contact power receiving unit 20, a switching circuit 30, a switching circuit 40, a rectifier circuit 50, a DC / DC conversion circuit 60, a first wiring 71, and a second wiring 72. And a third wiring 73 and a fourth wiring 74. The switching circuit 30, the switching circuit 40, the rectifier circuit 50, the DC / DC conversion circuit 60, the first wiring 71, the second wiring 72, the third wiring 73, and the fourth wiring 74 are used as power. A conversion circuit 100 is configured. The switching circuit 30, the switching circuit 40, and the DC / DC conversion circuit 60 are controlled by a control signal from an ECU mounted on the vehicle.

  An AC power supply 200 can be connected to the contact power receiving unit 10. On the other hand, a non-contact power feeding device 300 including an AC power supply 301 and a power transmission coil 302 can be magnetically coupled to the non-contact power receiving unit 20. In addition to the AC power supply 301 and the power transmission coil 302, the non-contact power supply apparatus 300 includes a capacitor, a coil, and the like (not shown). The power conversion circuit 100 converts the power input to the contact power receiving unit 10 or the non-contact power receiving unit 20 and supplies the converted power to the secondary battery 400 connected to the output terminal.

  The contact power reception unit 10 includes a pair of connection terminals 11 to which an AC power supply 200 is connected, a first coil 12, and a second coil 13. The connection terminal 11 is connected to one end of the first coil 12 and the second coil 13, respectively, and the other end of the first coil 12 and the second coil 13 is connected to the first wiring 71 and the second wiring 72, respectively. It is connected.

  The non-contact power receiving unit 20 is connected in parallel to the contact power receiving unit 10 with respect to the first wiring 71 and the second wiring 72, and includes the power receiving coil 21, the third coil 22, the fourth coil 23, and the first capacitor. 24. One end of the power receiving coil 21 is connected to one end of the third coil 22, and the other end of the power receiving coil 21 is connected to one end of the fourth coil 23. The other end of the third coil 22 is connected to the first wiring 71 via the first capacitor 24, and the other end of the fourth coil 23 is connected to the second wiring 72.

  The open / close circuit 30 includes a first bipolar transistor 31, a second bipolar transistor 32, a first diode 33, and a second diode 34. The collector of the first bipolar transistor 31 is connected to the first wiring 71, the emitter of the first bipolar transistor 31 is connected to the anode of the first diode 33, and the cathode of the first diode 33 is connected to the second wiring 72. It is connected. The emitter of the second bipolar transistor 32 is connected to the first wiring 71, the collector of the second bipolar transistor 32 is connected to the cathode of the second diode 34, and the anode of the second diode 34 is connected to the second wiring 72. It is connected. That is, the first bipolar transistor 31 and the second bipolar transistor 32 are connected in parallel so that the polarities are opposite to each other. The first bipolar transistor 31 has a first parasitic diode 35 connected in parallel in the reverse direction, and the second bipolar transistor 32 has a second parasitic diode 36 connected in parallel in the reverse direction. The first bipolar transistor 31 and the second bipolar transistor 32 are ON / OFF controlled by receiving a control signal from the ECU.

  The switching circuit 40 is a parallel connection body of the second capacitor 41 and the relay 42 provided in the second wiring 72. The relay 42 is switched between connection and release by receiving a control signal from the ECU.

  The rectifier circuit 50 includes a diode bridge circuit including a third diode 51, a fourth diode 52, a fifth diode 53, and a sixth diode 54, and a smoothing capacitor 55. The cathode of the third diode 51 is connected to the third wiring 73, and the anode of the third diode 51 is connected to the first wiring 71 and the cathode of the fifth diode 53. The cathode of the fourth diode 52 is connected to the third wiring 73, and the anode of the fourth diode 52 is connected to the second wiring 72 and the cathode of the sixth diode 54. The anode of the fifth diode 53 and the anode of the sixth diode 54 are connected to the fourth wiring 74. A smoothing capacitor 55 is connected in parallel to the output side of the third wiring 73 and the fourth wiring 74. The voltage applied to the smoothing capacitor 55 is measured by a voltage detector (not shown), and the detection value of the voltage detector is input to the ECU. When the detected value of the voltage detector is a predetermined abnormality, the ECU determines that it is abnormal and transmits a control signal for executing circuit protection control.

  FIG. 2 is a circuit diagram when AC power supplied from the AC power supply 200 is received by the contact power receiving unit 10 in the charging device according to the present embodiment. In FIG. 2, a circuit portion used for charging the secondary battery 400 is indicated by a solid line, and a circuit portion not used for charging the secondary battery 400 is indicated by a broken line.

  When receiving power from the AC power supply 200 via the contact power receiving unit 10, the first bipolar transistor 31 and the second bipolar transistor 32 of the switching circuit 30 are ON / OFF controlled. By doing so, the switching circuit 30 cooperates with the first coil 12 and the second coil 13 to perform PFC control, which is control for suppressing harmonics of the input AC power. The relay 42 is connected, and AC power whose harmonics are suppressed by PFC control is input to the rectifier circuit 50 via the relay 42. The AC power input to the rectifier circuit 50 becomes a pulsating current in the diode bridge circuit, converted into DC power by the smoothing capacitor 55, and then input to the DC / DC conversion circuit 60. The direct current power input to the DC / DC conversion circuit 60 is stepped up or stepped down and supplied to the secondary battery 400.

  FIG. 3 is a circuit diagram when AC power supplied from the non-contact power supply apparatus 300 is received via the non-contact power receiving unit 20 in the charging apparatus according to the present embodiment. In FIG. 3, a circuit portion used for charging the secondary battery 400 is indicated by a solid line, and a circuit portion not used for charging the secondary battery 400 is indicated by a broken line. That is, the first bipolar transistor 31 and the second bipolar transistor 32 are OFF, and the relay 42 is open.

  The resonance frequency of the non-contact power supply device 300 that supplies power to the non-contact power receiving unit 20 and the resonance frequency of the charging device when the first bipolar transistor 31, the second bipolar transistor 32, and the relay 42 are opened are I'm doing it. Power can be supplied with high efficiency by magnetically coupling circuits having the same resonance frequency through a coil and causing resonance. Here, the resonance frequency is determined by the inductance of the coil included in the circuit, the capacitance of the capacitor, and the circuit configuration. Therefore, in the present embodiment, the inductances of the third coil 22 and the fourth coil 23, the first capacitor 24, the second capacitor 41, and the like so that the resonance frequency of the contactless power supply device 300 and the resonance frequency of the charging device match. The capacitance of the smoothing capacitor 55 is determined.

  The AC power input to the power receiving coil 21 is input to the rectifier circuit 50 through the third coil 22 and the fourth coil 23, the first capacitor 24 and the second capacitor 41. Here, the first capacitor 24 and the second capacitor 41 function as a filter. The AC power input to the rectifier circuit 50 becomes a pulsating current in the diode bridge circuit, converted into DC power by the smoothing capacitor 55, and then input to the DC / DC conversion circuit 60. The direct current power input to the DC / DC conversion circuit 60 is stepped up or stepped down and supplied to the secondary battery 400.

  FIG. 4 shows the charging device according to the present embodiment, in which AC power supplied from the non-contact power supply device 300 is applied to the smoothing capacitor 55 during power reception via the non-contact power receiving unit 20. It is a circuit diagram when it is detected that the voltage has become a predetermined value or more and circuit protection control is performed. In FIG. 4, a circuit portion used when the circuit protection control is performed is indicated by a solid line, and a circuit portion that is not used when the circuit protection control is performed is indicated by a broken line. In the circuit protection control, the first bipolar transistor 31 and the second bipolar transistor 32 are turned on. Therefore, the AC power input to the power receiving coil 21 passes through the first bipolar transistor 31 and the first diode 33 when positive, and passes through the second bipolar transistor 32 and second diode 34 when negative. . In the circuit protection control, the relay 42 is connected and the second capacitor 41 is disconnected from the circuit.

  As described above, the resonance frequency is determined by the inductance of the coil included in the circuit, the capacitance of the capacitor, and the circuit configuration. In the circuit protection control, the first bipolar transistor 31 and the second bipolar transistor 32 are turned ON to form a closed circuit, and the circuit configuration is changed by connecting the relay 42 and disconnecting the second capacitor 41 from the circuit. Yes. As a result, the resonance frequency of the contactless power supply device 300 and the resonance frequency of the charging device are shifted, and resonance does not occur. Therefore, the electric power supplied from the non-contact power supply apparatus 300 to the charging apparatus is greatly reduced. On the other hand, the power remaining in the charging device is consumed by the power receiving coil 21, the third coil 22, the fourth coil 23, and the like in the closed circuit.

  With the above configuration, the charging device according to the present embodiment has the following effects.

  When performing circuit protection control, a closed circuit is formed on the input side from the smoothing capacitor 55. Therefore, by performing circuit protection control, it is possible to prevent power from being supplied to the DC / DC conversion circuit 60 and high voltage from being applied to the smoothing capacitor 55. In addition, since a part of the circuit that performs PFC control when receiving power via the contact power receiving unit 10 can be used for circuit protection control when receiving power via the non-contact power receiving unit 20, the circuit is configured. The number of parts to be reduced can be reduced.

  In the circuit protection control, the relay 42 is connected and the second capacitor 41 is disconnected from the power conversion circuit 100. As a result, the resonance frequency of the non-contact power supply apparatus 300 is shifted from the resonance frequency of the charging apparatus, resonance does not occur, and the efficiency of power transfer is greatly reduced. As a result, power reception from the non-contact power supply apparatus 300 can be suppressed.

  In the case of circuit protection control, both the first bipolar transistor 31 and the second bipolar transistor 32 having polarity and connected in opposite directions are closed, so that the closed circuit is always closed against changes in the polarity of AC power. It can be.

  The capacity of the smoothing capacitor 55 is determined based on the maximum voltage applied to the smoothing capacitor 55. By performing circuit protection control on condition that the voltage applied to the smoothing capacitor 55 is equal to or higher than a predetermined value, the voltage applied to the smoothing capacitor 55 can be suppressed to be less than the predetermined value. The capacity can be reduced.

Second Embodiment
FIG. 5 is a circuit diagram of the charging device according to the present embodiment. The charging device according to the present embodiment is different from the charging device according to the first embodiment in the configuration of the open / close circuit 30 ′.

  The open / close circuit 30 'is composed of a first bipolar transistor 31' and a second bipolar transistor 32 '. The collector of the first bipolar transistor 31 ′ is connected to the first wiring 71, the emitter of the first bipolar transistor 31 ′ is connected to the emitter of the second bipolar transistor 32 ′, and the collector of the second bipolar transistor 32 ′. Is connected to the second wiring 72. That is, the first bipolar transistor 31 'and the second bipolar transistor 32' are connected in series so that the polarities are opposite to each other. The first bipolar transistor 31 'has a first parasitic diode 35' connected in parallel in the reverse direction, and the second bipolar transistor 32 'has a second parasitic diode 36' connected in parallel in the reverse direction. Yes.

  FIG. 6 is a circuit diagram when AC power supplied from the AC power supply 200 is received by the contact power receiving unit 10 in the charging device according to the present embodiment. In FIG. 6, a circuit portion used for charging the secondary battery 400 is indicated by a solid line, and a circuit portion not used for charging the secondary battery 400 is indicated by a broken line.

  When receiving power from the AC power supply 200 via the contact power receiving unit 10, the first bipolar transistor 31 'and the second bipolar transistor 32' of the switching circuit 30 'are ON / OFF controlled. By doing so, the switching circuit 30 ′ cooperates with the first coil 12 and the second coil 13 to perform PFC control, which is control for suppressing harmonics of the input AC power. The relay 42 is connected, and AC power whose harmonics are suppressed by PFC control is input to the rectifier circuit 50 via the relay 42. The AC power input to the rectifier circuit 50 becomes a pulsating current in the diode bridge circuit, converted into DC power by the smoothing capacitor 55, and then input to the DC / DC conversion circuit 60. The direct current power input to the DC / DC conversion circuit 60 is stepped up or stepped down and supplied to the secondary battery 400.

  FIG. 7 is a circuit diagram when AC power supplied from the non-contact power supply device 300 is received via the non-contact power receiving unit 20 in the charging device according to the present embodiment. In FIG. 7, a circuit portion used for charging the secondary battery 400 is indicated by a solid line, and a circuit portion not used for charging the secondary battery 400 is indicated by a broken line. That is, the first bipolar transistor 31 'and the second bipolar transistor 32' are OFF, and the relay 42 is open.

  The AC power input to the power receiving coil 21 is input to the rectifier circuit 50 through the third coil 22 and the fourth coil 23, the first capacitor 24 and the second capacitor 41. Here, the first capacitor 24 and the second capacitor 41 function as a filter. The AC power input to the rectifier circuit 50 becomes a pulsating current in the diode bridge circuit, converted into DC power by the smoothing capacitor 55, and then input to the DC / DC conversion circuit 60. The direct current power input to the DC / DC conversion circuit 60 is stepped up or stepped down and supplied to the secondary battery 400.

  FIG. 8 shows the charging device according to the present embodiment, in which the AC power supplied from the non-contact power supply device 300 is applied to the smoothing capacitor 55 while the AC power is being received via the non-contact power receiving unit 20. It is a circuit diagram when it is detected that the voltage has become a predetermined value or more and circuit protection control is performed. In FIG. 8, a circuit portion used when the circuit protection control is performed is indicated by a solid line, and a circuit portion which is not used when the circuit protection control is performed is indicated by a broken line. In circuit protection control, control is performed to turn on the first bipolar transistor 31 'and the second bipolar transistor 32'. Therefore, the AC power input to the power receiving coil 21 passes through the first bipolar transistor 31 ′ and the second parasitic diode 36 ′ in the positive case, and passes through the second bipolar transistor 32 ′ and the first parasitic diode 36 ′ in the negative case. It passes through the diode 35 '. In the circuit protection control, the relay 42 is connected and the second capacitor 41 is disconnected from the circuit.

  In the circuit protection control, the first bipolar transistor 31 ′ and the second bipolar transistor 32 ′ are turned on to form a closed circuit, and the relay 42 is connected to disconnect the second capacitor 41 from the circuit to change the circuit configuration. I am letting. As a result, the resonance frequency of the contactless power supply device 300 and the resonance frequency of the charging device are shifted, and resonance does not occur. Therefore, the electric power supplied from the non-contact power supply apparatus 300 to the charging apparatus is greatly reduced. On the other hand, the power remaining in the charging device is consumed by the power receiving coil 21, the third coil 22, the fourth coil 23, and the like in the closed circuit.

  Since the present embodiment has the above-described configuration, in addition to the effect of the first embodiment, there is an effect that the number of diodes constituting the switching circuit 30 ′ can be reduced.

<Modification>
In each of the above embodiments, in the circuit protection control, both the first bipolar transistor 31, 31 ′ and the second bipolar transistor 32, 32 ′ are turned on, but only one of them may be turned on. Good. Since non-contact power feeding is generally performed at a high frequency, the polarity of the AC power changes in a short time. Therefore, even when one of the bipolar transistors is closed, a closed circuit can be formed in a short time with respect to the input AC power. And once it becomes a closed circuit, since the resonant frequency shifts | deviates, the transfer efficiency of electric power can be reduced significantly.

  In each of the above embodiments, a bipolar transistor is used as a switching element serving as an opening / closing means, and a diode is used as a rectifying element. However, the switching element and the rectifying element are not limited to these elements.

  In each of the above embodiments, the voltage applied to the smoothing capacitor 55 is not less than a predetermined value as a condition for performing circuit protection control. However, a voltage detector is provided at the output terminal of the DC / DC conversion circuit 60. The condition may be that the voltage at the output end is equal to or higher than a predetermined value. By so doing, circuit protection control can be performed when the secondary battery 400 is disconnected from the output end and the voltage at the output end increases. Therefore, when the secondary battery 400 is removed from the output end, it is possible to prevent further power from being supplied to the non-contact power receiving unit 20 by changing the resonance frequency of the charging device. It is possible to reduce the amount of electric power remaining in the charging device when 400 is disconnected from the output end. Further, since it is possible to detect whether or not the secondary battery 400 is overcharged based on the voltage at the output end, circuit protection control is performed when the secondary battery 400 is overcharged, and It is also possible to prevent further power from being supplied.

  In each of the above embodiments, the circuit protection control is performed as a condition that the voltage applied to the smoothing capacitor 55 is equal to or higher than a predetermined value. In the above modification, the voltage at the output terminal of the DC / DC conversion circuit 60 is The circuit protection control is performed on condition that the predetermined value is exceeded. However, the circuit protection control is performed on the condition that the voltage at other places in the charging device other than the voltage applied to the smoothing capacitor 55 and the voltage at the output terminal of the DC / DC conversion circuit 60 becomes a predetermined value or more. It is good. Further, an ammeter may be provided in the charging device, and circuit protection control may be performed when an overcurrent is detected.

  DESCRIPTION OF SYMBOLS 10 ... Contact power receiving part, 20 ... Non-contact power receiving part, 31 ... 1st bipolar transistor, 31 '... 1st bipolar transistor, 32 ... 2nd bipolar transistor, 32' ... 2nd bipolar transistor, 100 ... Power converter circuit, 200 ... AC power supply, 400 ... secondary battery.

Claims (8)

A contact power receiving unit (10) connected to an AC power source (200) and receiving AC power;
A power conversion circuit having an opening / closing means (31, 32, 31 ′, 32 ′) for converting AC power input from the contact power receiving unit and supplying the AC power to a secondary battery (400) connected to an output terminal 100)
A non-contact power reception unit (20) connected in parallel with the contact power reception unit and AC power is input in a non-contact manner,
The power conversion circuit includes a switching circuit (30) connected to the contact power receiving unit, and a rectification circuit (50) connected to the switching circuit,
The opening / closing means is included in the opening / closing circuit,
The opening / closing means is connected to control AC power received from the AC power source via the contact power receiving unit by being controlled to open and close,
The charging device according to claim 1, wherein the opening / closing means is connected so as to form a closed circuit to the non-contact power receiving unit via the opening / closing circuit when the opening / closing means is closed. The power conversion circuit includes a pre-Symbol rectifier circuit and the output terminal connected to the DC / DC converter circuit (60), connected in parallel smoothing capacitor between said rectifier circuit and the DC / DC converter circuit (55 ) and the charging device according to claim 1, characterized in that there Bei Ete a.   The charging device according to claim 2, wherein the switching circuit and the rectifier circuit are connected via a parallel connection body of a capacitor (41) and a relay (42).   4. The charging device according to claim 3, wherein when the power is received by the non-contact power receiving unit, the relay is opened, and the relay is connected when the power conversion circuit is abnormal. The opening / closing means includes two switching elements (31, 32) having polarity, and the switching elements are connected in parallel so that the polarities are opposite to each other,
The charging device according to claim 1, wherein the contact power reception unit, the non-contact power reception unit, and the opening / closing means are connected in parallel. The opening / closing means includes two switching elements (31 ′, 32 ′) having polarity and rectifying elements (35 ′, 36 ′) connected in parallel so that the polarities of the switching elements are opposite to each other. The switching elements are connected in series so that the polarities are opposite to each other,
The charging device according to claim 1, wherein the contact power reception unit, the non-contact power reception unit, and the opening / closing means are connected in parallel.   The charging device according to claim 5, wherein when the closed circuit is formed, at least one of the switching elements is closed.   8. When the power is received by the non-contact power receiving unit, the open / close unit is closed when a voltage of a predetermined unit in the power conversion circuit becomes a predetermined value or more. The charging device according to any one of the above.

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