Charging / discharging device

Abstract

The invention provides a charging and discharging device which supplies power of a battery to an electrically heated catalyst and an external device at all operating points at the same time. This charging / discharging device is provided with: an AC / DC converter that converts AC power from an external power source into DC power; a DC / DC converter that converts the DC power from the AC / DC converter into power suitable for a battery; an output terminal electrically connected to a power line of the DC / DC converter; and a switch provided between the power line and the output terminal to which the electrically heated catalyst is electrically connected, the control device supplying the power of the battery to the electrically heated catalyst and the external device at the same time, when the required voltage of the electrically heated catalyst is lower than the output voltage corresponding to the power supply range of the external device, the switch is switched on and switched off when the required voltage of the electrically heated catalyst is lower than the output voltage corresponding to the power supply range of the external device. The switch is intermittently operated.

Description

Technical Field

[0001] The present invention relates to a charging and discharging device. Background Art

[0002] Patent Document 1 discloses that an externally chargeable hybrid vehicle includes a charger that converts power supplied from an external power source into DC power suitable for a battery and an EHC power source that converts battery power into a predetermined voltage and supplies the voltage to an electrically heated catalyst.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-193245 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the structure described in Patent Document 1, the charger and the EHC power supply are configured as separate hardware, so the device becomes large and the cost becomes high. Therefore, it is considered to integrate the charger and the EHC power supply and make the charger a bidirectional charger, but in this case, it may not be possible to supply power to both the electrically heated catalyst and the external device depending on the operating point.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a charge and discharge device capable of supplying electric power from a battery to an electrically heated catalyst and external equipment simultaneously at all operating points.

[0009] Means for solving problems

[0010] The present invention provides a charging and discharging device, comprising: a bidirectional charger, which converts power supplied from an external power source connected to an inlet into direct current power of a battery suitable for storing power, and converts the direct current power of the battery into alternating current power and supplies it to an external device connected to a socket; and a control device, which controls the bidirectional charger, wherein the charging and discharging device is characterized in that the bidirectional charger comprises: an AC / DC converter, which converts the alternating current power from the inlet into direct current power; a DC / DC converter, which converts the direct current power from the AC / DC converter into a predetermined voltage and supplies it to the battery; an output terminal, which is electrically connected to a power line, and the power line is connected to the AC / DC converter in the DC / DC converter. The control device is configured to connect the input and output terminals of the device side; and a switch, which is arranged between the power line and the output terminal, and the output terminal is electrically connected to the electrically heated catalyst, the DC / DC converter converts the DC power from the battery into a predetermined output voltage and outputs it to the output terminal and the AC / DC converter, the AC / DC converter converts the DC power from the DC / DC converter into AC power and outputs it to the socket, and when the control device supplies the power of the battery to the electrically heated catalyst and the external device at the same time, if the required voltage of the electrically heated catalyst is lower than the output voltage corresponding to the power supply range of the external device, the switch is intermittently operated.

[0011] Effects of the Invention

[0012] In the present invention, the electric power of the battery can be supplied to the electrically heated catalyst and external equipment at all operating points simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a diagram schematically showing a charge and discharge device in an embodiment.

[0014] Figure 2 : is a diagram showing the relationship between the AC power supplyable range and the EHC required voltage range.

[0015] Figure 3 It is a diagram for explaining the intermittent operation of the switch.

[0016] Figure 4 It is a flowchart showing the power supply control flow.

[0017] Figure 5 It is a timing chart showing a state where power is supplied to the EHC. DETAILED DESCRIPTION

[0018] Hereinafter, a charge and discharge device in an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

[0019] Figure 1 1 is a diagram schematically showing a charge and discharge device in an embodiment. The charge and discharge device 1 is a charger mounted on a vehicle having an engine and a motor for external charging, and is a power supply device that supplies power to an electrically heated catalyst that purifies the exhaust gas of the engine. The electrically heated catalyst is a catalyst that is provided in the exhaust passage of the engine and generates heat when electricity is supplied. The vehicle equipped with the charge and discharge device 1 is a plug-in hybrid vehicle. The charge and discharge device 1 includes a bidirectional charger 2 and a control device 3.

[0020] The bidirectional charger 2 is a charger that uses AC power supplied from an AC power source (external power source) outside the vehicle to charge the battery 4. The battery 4 is a DC power source that can be charged and discharged, and is a high-voltage battery that supplies power to a motor for traveling. The battery 4 is composed of a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The battery 4 discharges power to the bidirectional charger 2, or receives power supplied from the bidirectional charger 2.

[0021] The bidirectional charger 2 is electrically connected to the battery 4, the inlet 5, the socket 6, and the electrically heated catalyst (hereinafter referred to as EHC) 7. The bidirectional charger 2 supplies the power of the battery 4 to the EHC 7. When the charging and discharging device 1 supplies the power to the EHC 7, it can supply the power to the external device connected to the socket 6. That is, the charging and discharging device 1 can supply the power of the battery 4 to the EHC 7 and the external device at the same time.

[0022] The inlet 5 is an AC inlet connected to an external power source. A connector of a power supply device can be connected to the inlet 5. For example, a connector of an AC charging cable connected to a charging station is connected to the inlet 5. The inlet 5 is electrically connected to the battery 4 via the bidirectional charger 2. The bidirectional charger 2 converts the AC power supplied from the inlet 5 into DC power suitable for the battery 4.

[0023] The socket 6 is an AC socket for connecting an external device. An external device that can be operated by AC power can be connected to the socket 6. For example, a plug of an external device that can be operated by 200V AC power is connected to the socket 6. In addition, an external device that can be operated by 100V AC power can be connected to the socket 6. The socket 6 is electrically connected to the battery 4 via the bidirectional charger 2. When the plug of the external device is connected to the socket 6, the bidirectional charger 2 supplies power from the battery 4 to the external device.

[0024] The EHC 7 is a catalyst provided in the exhaust passage of the engine and generates heat when energized. The EHC 7 is electrically connected to the battery 4 via the bidirectional charger 2. The bidirectional charger 2 includes output terminals 8 and 9 connected to the EHC 7. The bidirectional charger 2 outputs the power of the battery 4 to the EHC 7 from the output terminals 8 and 9.

[0025] The bidirectional charger 2 includes an AC / DC converter 21 , a DC / DC converter 22 , and a switch 23 .

[0026] The AC / DC converter 21 converts the AC power supplied from the external power source into DC power and outputs it to the DC / DC converter 22. A first relay 24 is provided between the AC / DC converter 21 and the inlet 5. When the first relay 24 is in a closed state (on state), the AC / DC converter 21 and the inlet 5 are connected in a manner that allows electricity to flow. When the power supplied from the external power source is charged to the battery 4, the first relay 24 is in an on state.

[0027] The AC / DC converter 21 converts the DC power supplied from the DC / DC converter 22 into AC power and outputs it to the socket 6. A second relay 25 is provided between the AC / DC converter 21 and the socket 6. When the second relay 25 is in a closed state (on state), the AC / DC converter 21 and the socket 6 are connected in a manner that allows electricity to flow. When the power of the battery 4 is supplied to the external device, the second relay 25 is in an on state.

[0028] The DC / DC converter 22 converts the DC power input from the AC / DC converter 21 into charging power and supplies it to the battery 4. When external charging is performed, the power of the external power source is supplied from the AC / DC converter 21 to the battery 4 via the DC / DC converter 22.

[0029] The DC / DC converter 22 converts the power of the battery 4 into a predetermined output voltage and supplies it to the AC / DC converter 21. When external power is supplied, the power of the battery 4 is supplied from the DC / DC converter 22 to the external device via the AC / DC converter 21 and the socket 6. Furthermore, the DC / DC converter 22 converts the power of the battery 4 into a predetermined output voltage and supplies it to the EHC 7. When power is supplied to the EHC 7, the power of the battery 4 is supplied to the EHC 7 via the DC / DC converter 22 and the output terminals 8 and 9.

[0030] The switch 23 is a switch provided between the DC / DC converter 22 and the EHC 7. The switch 23 is configured to be intermittently operated. The switch 23 is provided between the output terminal 8 and the power line PL1. The output terminals 8 and 9 are electrically connected to the power lines PL1 and PL2 of the DC / DC converter 22. The power lines PL1 and PL2 are power lines connected to the input and output terminals on the AC / DC converter 21 side of the DC / DC converter 22. The switch 23 is a relay for electrically connecting / disconnecting the EHC 7 and the power line PL1. The switch 23 switches the open and closed states based on the control signal from the control device 3.

[0031] The control device 3 is an electronic control device that controls the bidirectional charger 2. The control device 3 includes a processor and a memory. The processor is composed of a CPU, etc. The memory is composed of a RAM, a ROM, etc. The control device 3 loads the program stored in the storage unit into the working area of ​​the memory (main storage device) and executes it, and controls each component, etc. through the execution of the program, thereby realizing functions consistent with the predetermined purpose. Signals from various sensors are input to the control device 3. The control device 3 performs various controls based on the signals input from the various sensors.

[0032] The control device 3 performs external charging control for charging the battery 4 with power from the inlet 5, external power supply control for supplying the power of the battery 4 to an external device, and internal power supply control for supplying the power of the battery 4 to the EHC 7. The control device 3 can perform power supply control for simultaneously supplying the power of the battery 4 to the external device and the EHC 7. When performing simultaneous power supply, the control device 3 controls the output voltage of the bidirectional charger 2 based on the required voltage from the external device and the required voltage from the EHC 7 so as to satisfy the required voltages of both.

[0033] Figure 2 : is a diagram showing the relationship between the AC power supply range and the EHC required voltage range. Figure 2 The secondary side voltage shown indicates the output voltage of the DC / DC converter 22 when power is supplied from the bidirectional charger 2 to the EHC 7 and external devices.

[0034] like Figure 2 As shown, the output voltage of the DC / DC converter 22 is controlled to satisfy the required voltage range of the EHC 7 and the power supply range of the external device. The external device connected to the socket 6 is driven by the AC power supply voltage of 100 V and 200 V. When the AC / DC converter 21 converts the DC power from the DC / DC converter 22 into AC power, it outputs the AC power stepped down to a predetermined voltage to the socket 6 side. Figure 2 The AC power supply range shown indicates a DC voltage, and indicates the output voltage of the DC / DC converter 22 corresponding to the AC voltage within the range that can be supplied to the external device. The required voltage range of the EHC 7 is a range that includes the AC power supply range, and is set to include a range of voltages lower than the AC power supply range. During AC power supply, the peak value can be stepped down by PWM control of the AC / DC converter 21.

[0035] When the required voltage of EHC7 is within the AC power supply range, if the output voltage of DC / DC converter 22 is controlled so as to become the required voltage of EHC7, it is possible to output to EHC7 and external devices at the same time. On the other hand, when the required voltage of EHC7 is lower than the AC power supply range, if the output voltage of DC / DC converter 22 is controlled so as to become the required voltage of EHC7, the output voltage will deviate from the AC power supply voltage and cannot be output to EHC7 and external devices at the same time. When the temperature of EHC7 rises, the resistance value decreases. In order not to exceed the allowable power of EHC7, it is necessary to reduce the output voltage to EHC7. However, if the output voltage of DC / DC converter 22 is reduced excessively, the voltage required for AC power supply cannot be ensured.

[0036] Therefore, in the charging and discharging device 1, it is possible to output power to the EHC 7 and power to external devices simultaneously at all operating points. Specifically, in the charging and discharging device 1, when the required voltage of the EHC 7 is lower than the AC power supply range during the period when power is supplied to the EHC 7 and external devices simultaneously, the switch 23 is operated intermittently. By performing intermittent operation of the switch 23, it is possible to reduce the power supplied from the DC / DC converter 22 to the EHC 7 while maintaining the output voltage of the DC / DC converter 22. The control device 3 controls the output voltage of the DC / DC converter 22 by giving priority to AC power supply. The control device 3 controls the output voltage of the DC / DC converter 22 to maintain the same voltage as the AC power supply. Figure 2 The voltage corresponding to the AC power supply range shown in FIG. 1 is a voltage corresponding to the AC power supply range shown in FIG. 1 . During the on-time period of supplying power to the EHC 7, the control device 3 Figure 3 As shown, the timing of the intermittent operation of the switch 23 is controlled so that the average power required by the EHC 7 can be supplied to the EHC 7 without exceeding the permissible value of the short-term power amount that the EHC 7 can tolerate.

[0037] Figure 4 It is a flowchart showing the power supply control flow. Figure 4 The control shown is carried out by the control device 3 .

[0038] The control device 3 starts up the bidirectional charger 2 (step S1 ).

[0039] The control device 3 determines whether or not there is a request for power supply from the EHC 7 (step S2 ).

[0040] When it is determined that there is no power supply request from the EHC 7 (step S2 : NO), the control device 3 controls the bidirectional charger 2 to be in a standby state (step S3 ). When the process of step S3 is performed, the control routine returns to step S2 .

[0041] When it is determined that there is a power supply request from the EHC 7 (step S2: Yes), the control device 3 turns on the switch 23 to start the output from the bidirectional charger 2 to the EHC 7 (step S4). In step S4, the switch 23 is turned on, the DC / DC converter 22 is connected to the output terminals 8 and 9 so that electricity can flow, and the output voltage of the DC / DC converter 22 is controlled so as to meet the required voltage of the EHC 7. For example, the output voltage of the DC / DC converter 22 is controlled to be the same voltage as the required voltage of the EHC 7.

[0042] During the power supply to the EHC 7, the control device 3 determines whether AC power supply is being performed (step S5). In step S5, it is determined whether there is a power supply request from an external device connected to the socket 6. The control device 3 determines whether AC power supply is being performed by determining whether an external device is connected to the socket 6.

[0043] When it is determined that there is no AC power supply operation (step S5 : NO), the control device 3 determines whether the power supplied to the EHC 7 is within the allowable value (step S6 ).

[0044] When it is determined that the power supplied to the EHC 7 is not within the permissible value (step S6: No), the control device 3 suppresses the output voltage of the DC / DC converter 22 (step S7). The temperature of the EHC 7 rises due to power supply, and the resistance decreases with the temperature rise. In step S7, as a countermeasure against the decrease in the resistance of the EHC 7, the output voltage of the DC / DC converter 22 is reduced to adjust the power supplied to the EHC 7. Figure 5 As shown in FIG. 1 , when power is supplied to the EHC 7 (time t1), the EHC 7 generates heat due to power supply, so the resistance decreases (time t2). After time t2, the temperature of the EHC 7 rises, and the resistance decreases with the temperature rise. If the resistance decreases, a large amount of current flows while maintaining the same voltage, so the voltage is reduced to adjust to equal power. In this case, the resistance gradually decreases, the current gradually increases, and the voltage is controlled to gradually decrease. When the process of step S7 is implemented, the control routine returns to step S5.

[0045] When it is determined that the power supplied to the EHC 7 is within the permissible value (step S6 : YES), the control device 3 determines whether the power supplied to the EHC 7 is equal to or greater than a threshold value (step S8 ). In step S8 , it is determined whether the total energy since the start of power supply to the EHC 7 has reached the threshold value.

[0046] When it is determined that the amount of power supplied to the EHC 7 is greater than the threshold value (step S8: Yes), the control device 3 stops the output to the EHC 7 (step S9). In step S9, the power supply from the bidirectional charger 2 to the EHC 7 is stopped. The control device 3 stops the power supply to the EHC 7 by turning the switch 23 off. Figure 5 As shown, when the energy input to the EHC 7 reaches the threshold value, the power supply to the EHC 7 ends (time t5). When the process of step S9 is performed, this control routine ends.

[0047] When it is determined that the amount of electric power supplied to the EHC 7 is not equal to or greater than the threshold value (step S8 : NO), the control routine returns to step S5 .

[0048] When it is determined that the AC power supply operation is being performed (step S5 : Yes), the control device 3 determines whether the power supplied to the EHC 7 is within the allowable value (step S10 ).

[0049] When it is determined that the electric power supplied to the EHC 7 is within the permissible value (step S10 : YES), the control routine proceeds to step S8 .

[0050] When it is determined that the power supplied to the EHC 7 is not within the permissible value (step S10: No), the control device 3 determines whether the required voltage of the EHC 7 is a voltage corresponding to the AC power supply range (step S11). In step S11, when the output voltage of the DC / DC converter 22 is controlled to meet the required voltage of the EHC 7, it is determined whether the output voltage of the DC / DC converter 22 is within the AC power supply range. Figure 2 As shown, it is determined whether the required voltage of the EHC 7 is within the AC power supply range.

[0051] When it is determined that the required voltage of the EHC 7 is a voltage corresponding to the AC power supply range (step S11: Yes), the control device 3 suppresses the output voltage of the DC / DC converter 22 (step S12). In step S12, as a countermeasure against the decrease in the resistance of the EHC 7 accompanying the temperature increase, the output voltage of the DC / DC converter 22 is reduced to adjust the supply power of the EHC 7, similarly to the processing of step S7. In this case, the output voltage of the DC / DC converter 22 gradually decreases in accordance with the increase in the current accompanying the decrease in resistance. When the processing of step S12 is implemented, the control routine returns to step S10. In the case of returning from step S12 to step S10, the output voltage of the DC / DC converter 22 is reduced by the processing of step S12. Therefore, in step S11, it is determined again whether the output voltage of the DC / DC converter 22 is a voltage within the AC power supply range.

[0052] When it is determined that the required voltage of the EHC 7 is not a voltage corresponding to the AC power supply range (step S11: No), the control device 3 does not reduce the output voltage of the DC / DC converter 22 and implements the intermittent mode (step S13). In step S13, the switch 23 is intermittently operated. The control device 3 controls the switch 23 to intermittently operate in a manner such that the output voltage of the DC / DC converter 22 is maintained in the AC power supply range. At this time, when the output voltage of the DC / DC converter 22 is decreasing due to the processing of step S12, the control of reducing the output voltage of the DC / DC converter 22 is stopped and the switch 23 is intermittently operated.

[0053] The control device 3 calculates the short-term power consumption of the EHC 7 (step S14). Figure 3 As shown, the short-term power amount of the EHC 7 is represented by a value that increases and decreases in a manner such that the power amount increases when the switch 23 is turned on and decreases when the switch 23 is turned off when the switch 23 is intermittently operated.

[0054] The control device 3 determines whether the short-term power of the EHC 7 is within the allowable value (step S15). Figure 3 As shown, it is determined whether the short-term power of the EHC 7 is within the allowable value. The allowable value is set not to exceed the power that can withstand the heat of the EHC 7. The control device 3 sets the allowable value according to the heat capacity of the EHC 7.

[0055] When it is determined that the short-term power amount of the EHC 7 is within the permissible value (step S15 : Yes), the control routine proceeds to step S8 .

[0056] If it is determined that the short-term power consumption of the EHC 7 is not within the permissible value (step S15: No), the control device 3 temporarily stops the output to the EHC 7 (step S16). In step S16, the switch 23 is controlled to be in the off state. Figure 3 As shown, the control device 3 switches the switch 23 from the on state to the off state. When the switch 23 is switched to the off state, the power supply to the EHC 7 is stopped.

[0057] The control device 3 determines whether the average power is equal to or less than the power required by the EHC 7 (step S17 ). In step S17 , it is determined whether the average value of the power supplied to the EHC 7 is equal to or less than the power required by the EHC 7 .

[0058] If it is determined that the average power is not less than the required power of the EHC 7 (step S17: No), the control device 3 calculates the average supply power (step S18). Figure 3 As shown, the expected average supply power is calculated. When the process of step S18 is performed, the control routine returns to step S16.

[0059] When it is determined that the average power is less than the required power of the EHC 7 (step S17: Yes), the control device 3 restarts the output to the EHC 7 (step S19). In step S19, the switch 23 is controlled to be in the on state. Figure 3 As shown, the control device 3 switches the switch 23 from the off state to the on state. When the switch 23 is switched to the on state, the power supply to the EHC 7 is restarted. When the process of step S19 is performed, the control routine returns to step S5.

[0060] As described above, according to the embodiment, the bidirectional charger 2 includes the output terminals 8 and 9 and the switch 23, so that the EHC 7 can be powered in addition to the AC power supply at all operating points. As a result, the EHC 7 and the external device can be powered at the same time regardless of the operating point. In addition, low cost can be achieved and the system size can be reduced.

[0061] Description of Reference Numerals

[0062] 1 Charging and discharging device

[0063] 2. Bidirectional charger

[0064] 3 Control device

[0065] 4 Batteries

[0066] 5 Entrance

[0067] 6 sockets

[0068] 7 Electrically heated catalyst (EHC)

[0069] 8, 9 Output terminals

[0070] 21 AC / DC Converter

[0071] 22 DC / DC Converter

[0072] 23 Switch

[0073] 24 First relay

[0074] 25 Second relay

Claims

1. A charging and discharging device, comprising: a bidirectional charger that converts power supplied from an external power source connected to the inlet into direct current power for a battery suitable for storing power, and converts the direct current power of the battery into alternating current power for supplying to an external device connected to the socket; and A control device controls the bidirectional charger, wherein the charging and discharging device is characterized in that: The bidirectional charger has: an AC / DC converter to convert the AC power from the inlet into DC power; A DC / DC converter that converts the DC power from the AC / DC converter into a predetermined voltage and supplies the voltage to the battery; an output terminal electrically connected to a power line connected to an input and output terminal of the AC / DC converter in the DC / DC converter; and a switch, disposed between the power line and the output terminal, The output terminal is electrically connected to an electrically heated catalyst, The DC / DC converter converts the DC power from the battery into a predetermined output voltage and outputs the voltage to the output terminal and the AC / DC converter. The AC / DC converter converts the DC power from the DC / DC converter into AC power and outputs the AC power to the socket. When the control device supplies the electric power of the battery to the electrically heated catalyst and the external device simultaneously, if the required voltage of the electrically heated catalyst is lower than the output voltage corresponding to the power supplyable range of the external device, the switch is intermittently operated.

2. The charge and discharge device according to claim 1, characterized in that: The control device intermittently operates the switch while controlling the switch so that the output voltage is maintained within the power supplyable range when intermittently operating the switch.

3. The charge and discharge device according to claim 2, characterized in that: The control device controls the timing of the intermittent operation of the switch so that the amount of electric power that the electrically heated catalyst can tolerate in a short period of time is not exceeded while the switch is turned on and the electric power required by the electrically heated catalyst can be supplied.

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