JP4222262B2 - Power supply system, vehicle equipped with the same, and control method of power supply system - Google Patents

Description

  The present invention relates to a power supply system, a vehicle including the power supply system, and a control method for the power supply system, and more particularly to a power supply system capable of outputting commercial AC power to the outside, a vehicle including the power supply system, and a control method for the power supply system.

  Conventionally, proposals have been made to use a hybrid vehicle using a motor generator as a power source or an electric vehicle as a commercial power source (AC 100V power source) system. In other words, a hybrid vehicle or the like is to be used as an emergency power source in the event of an emergency or disaster, or as a commercial power source when there is no commercial power source facility around the camp site. And such a utilization method raises the commercial value of a hybrid vehicle etc.

  As an automobile that can be used as such a commercial power supply system, an automobile having a secondary battery and an AC100V inverter for converting DC power from the secondary battery into AC100V power and outputting it to an outlet is known. (For example, refer to Patent Document 1).

According to the automobile disclosed in Patent Document 1, whether or not AC100V output can be output is determined based on the state of an AC100V inverter, a vehicle control system, a secondary battery, and the like, so that good drive control of the vehicle is ensured. AC100V output can be performed using the power from the secondary battery.
JP 2002-374604 A

  In the above-described vehicle systems such as hybrid cars and electric cars, high efficiency and miniaturization are required. The commercial power supply system described above increases the commercial value of a hybrid vehicle or the like, but when mounted on a vehicle system, sufficient consideration must be given so as not to impede the required characteristics described above.

  In Patent Document 1 described above, it cannot be said that such consideration is sufficiently taken. That is, in Patent Document 1, the AC100V inverter converts the DC voltage from the secondary battery to AV100V and outputs it, but the battery voltage is not so high (for example, about 200V), so a certain amount of external output (power) is ensured. In this case, the amount of current becomes large. Therefore, in the technique disclosed in Patent Document 1, it is expected that the power element constituting the AC 100V inverter is increased in size, leading to a decrease in efficiency and an increase in physique.

  Therefore, the present invention has been made to solve such a problem, and an object thereof is to provide a power supply system that realizes high efficiency.

  Another object of the present invention is to provide a power supply system that realizes miniaturization.

  Another object of the present invention is to provide a vehicle including a power supply system that achieves high efficiency.

  Another object of the present invention is to provide a vehicle equipped with a power supply system that realizes miniaturization.

  Another object of the present invention is to provide a method for controlling a power supply system that achieves high efficiency.

  According to the present invention, a power supply system receives a direct current power source that generates a first direct current voltage and a first direct current voltage that is output from the direct current power source, and the received first direct current voltage is converted into a second direct current voltage. A boost converter that boosts the voltage to the second voltage, and a second DC voltage boosted by the boost converter, and converts the received second DC voltage into a predetermined AC voltage to a commercial voltage using device connected to the external output terminal A voltage converter for outputting.

  Preferably, the power supply system further includes an inverter connected to the boost converter and receiving a second DC voltage from the boost converter to drive and control the rotating electrical machine, and the voltage conversion device connects the inverter to the boost converter. Connected to the line.

  Preferably, the inverter receives a voltage generated by the rotating electric machine and further supplies the received voltage to the power supply line, and the voltage converter receives the supply voltage supplied from the inverter to the power supply line and receives the received supply. The voltage is converted into a predetermined AC voltage and further output to a commercial voltage using device.

  Preferably, the power supply system further includes a control device that controls operations of the boost converter, the inverter, and the voltage conversion device, and the control device is configured to boost the second voltage boosted by the boost converter when the remaining capacity of the DC power supply is equal to or greater than a predetermined amount. The boost converter and the voltage converter are controlled so that the direct current voltage is converted into a predetermined alternating current voltage and output to a commercial voltage utilization device. When the remaining capacity of the direct current power source is less than the predetermined amount, the rotating electric machine generates power. In addition, the inverter and the voltage conversion device are controlled so that the supply voltage supplied to the power supply line by the inverter is converted into a predetermined AC voltage and output to the commercial voltage utilization device.

  Preferably, the boost converter changes the voltage level of the second DC voltage based on the power consumption by the commercial voltage using device.

  Preferably, the boost converter boosts the first DC voltage so that the second DC voltage becomes a maximum voltage that can be boosted by the boost converter when the power consumption by the commercial voltage using device is equal to or greater than a predetermined amount. When the consumption amount is smaller than the predetermined amount, the first DC voltage is boosted so that the second DC voltage is at a voltage level lower than the maximum voltage.

  Preferably, the predetermined AC voltage is a commercial AC voltage.

  According to the present invention, the vehicle includes any one of the power supply systems described above.

  Preferably, the voltage conversion device is driven when the vehicle is stopped.

  Preferably, the voltage conversion device is further driven when the vehicle is traveling, and limits the power output to the commercial voltage utilization device when the power consumption by the commercial voltage utilization device exceeds a predetermined amount during traveling of the vehicle. .

  According to the invention, the control method of the power supply system drives the rotating electrical machine using the second DC voltage obtained by boosting the first DC voltage generated by the DC power supply, and the boosted second DC voltage is used. A method for controlling a power supply system capable of converting a direct current voltage into a predetermined alternating current voltage and outputting the same to a commercial voltage utilization device connected to an external output terminal, the first step of calculating power consumption by the commercial voltage utilization device And a second step of controlling the voltage level of the second DC voltage based on the power consumption calculated in the first step.

  Preferably, the second step controls the second DC voltage to a voltage level lower than the maximum voltage that can be boosted when the power consumption calculated in the first step is smaller than a predetermined amount. A sub-step and a second sub-step of controlling the second DC voltage to a voltage level of the maximum voltage when the power consumption calculated in the first step is equal to or greater than a predetermined amount.

  Preferably, the control method of the power supply system includes a third step of confirming a stop state of the vehicle on which the power supply system is mounted, and a second step when the stop state of the vehicle is confirmed in the third step. And a fourth step of converting the second DC voltage whose voltage level is controlled to a predetermined AC voltage and outputting the same to a commercial voltage using device.

  According to the invention, the control method of the power supply system drives the rotating electrical machine using the second DC voltage obtained by boosting the first DC voltage generated by the DC power supply, and the boosted second DC voltage is used. A control method of a power supply system capable of converting a DC voltage into a predetermined AC voltage and outputting the same to a commercial voltage using device connected to an external output terminal, the first step of calculating a remaining capacity of the DC power supply, A second step of converting the boosted second DC voltage into a predetermined AC voltage and outputting it to a commercial voltage utilizing device when the remaining capacity calculated in step 1 is a predetermined amount or more; And a third step of converting the electric power generated by the rotating electrical machine into a predetermined AC voltage and outputting it to a commercial voltage utilizing device when the remaining capacity calculated in the step is smaller than a predetermined amount.

  Preferably, the control method of the power supply system further includes a fourth step of confirming a stop state of the vehicle on which the power supply system is mounted, and the second step is performed when the stop state of the vehicle is confirmed in the fourth step. Alternatively, a predetermined AC voltage is output to the commercial voltage using device in the third step.

  Preferably, the predetermined AC voltage is a commercial AC voltage.

  In the power supply system according to the present invention, the voltage conversion device converts the second DC voltage boosted by the boost converter into a predetermined AC voltage and outputs it to a commercial voltage utilization device connected to the external output terminal. Therefore, it is possible to reduce the input current of the voltage conversion device while securing the output power to the commercial voltage utilization device.

  Therefore, according to this invention, the power element which comprises a voltage converter can be reduced in size, As a result, the efficiency improvement by reduction of the emitted-heat amount or reduction of cooling capability can be aimed at. Moreover, a voltage converter can be reduced in size by using a small power element for a voltage converter.

  In the power supply system according to the present invention, the control device converts the second DC voltage boosted by the boost converter into a predetermined AC voltage and outputs it to a commercial voltage using device, or generates a voltage generated by the rotating electrical machine. Is converted into a predetermined AC voltage and output to a commercial voltage using device according to the remaining capacity of the DC power supply. Output to commercial voltage equipment.

  Therefore, according to the present invention, a predetermined AC voltage can be supplied to an external commercial voltage utilizing device regardless of the state of charge of the DC power supply.

  Further, in the power supply system according to the present invention, the boost converter changes the voltage level of the second DC voltage based on the power consumption by the commercial voltage using device, so that it corresponds to the load condition of the commercial voltage using device. The boost control is executed.

  Therefore, according to the present invention, the input voltage of the voltage conversion device is not boosted to an unnecessary voltage level when the load of the commercial voltage utilization device is small, and the efficiency of the entire power supply system can be improved.

  Moreover, according to the vehicle according to the present invention, since the above-described power supply system is provided, it is possible to realize the high efficiency and miniaturization particularly required for the vehicle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram showing the configuration of a hybrid vehicle shown as an example of a vehicle equipped with a power supply system according to the present invention.

  Referring to FIG. 1, hybrid vehicle 10 includes a battery 12, a power control unit (hereinafter referred to as “PCU”) 14, an AC output outlet 15, a power output device 16, a differential gear ( Differential Gear (hereinafter referred to as “DG”) 18, front wheels 20R and 20L, rear wheels 22R and 22L, front seats 24R and 24L, and a rear seat 26.

  The battery 12 is disposed, for example, behind the rear seat 26. The PCU 14 is disposed, for example, in an area below the floor located below the front seats 24R and 24L. The power output device 16 is disposed, for example, in an engine room in front of the dashboard 28. PCU 14 is electrically connected to battery 12 and power output device 16. The power output device 16 is connected to the DG 18.

  The battery 12 that is a DC power source is made of a secondary battery such as nickel hydride or lithium ion, for example. The battery 12 supplies the generated DC voltage to the PCU 14 and is charged by the DC voltage output from the PCU 14.

  PCU 14 boosts the DC voltage received from battery 12, converts the boosted DC voltage into an AC voltage, and drives and controls a motor generator (not shown, the same applies hereinafter) included in power output device 16. Further, the PCU 14 charges the battery 12 by converting the AC voltage generated by the motor generator included in the power output device 16 into a DC voltage.

  Further, the PCU 14 can boost the DC voltage received from the battery 12, convert the boosted DC voltage into a commercial AC voltage, and output the commercial AC voltage from the AC output outlet 15. Further, the PCU 14 can convert the voltage generated by the motor generator included in the power output device 16 into a commercial AC voltage and output it from the AC output outlet 15. The configuration of the PCU 14 will be described in detail later.

  The power output device 16 includes an engine (not shown, the same applies hereinafter) and a motor generator. The power output device 16 generates power from the engine and / or motor generator and outputs the power to the DG 18. Further, the power output device 16 receives the rotational force of the front wheels 20R, 20L and generates power, and supplies the generated power to the PCU 14. Further, the power output device 16 generates electric power by a motor generator using the power of the engine, and supplies the generated electric power to the PCU 14.

  The DG 18 transmits the power received from the power output device 16 to the front wheels 20R and 20L, and transmits the rotational force of the front wheels 20R and 20L to the power output device 16.

  In the above, the battery 12 and the PCU 14 constitute a “power supply system”.

  FIG. 2 is a circuit diagram showing a configuration of a main part of PCU 14 shown in FIG.

  Referring to FIG. 2, PCU 14 includes a boost converter 32, inverters 34 and 36, a DC / AC converter 38, a controller 40, capacitors C1 and C2, power supply lines PL1 and PL2, and a ground line SL. And U-phase lines UL1 and UL2, V-phase lines VL1 and VL2, and W-phase lines WL1 and WL2.

  Motor generator MG1 connected to inverter 34 via U, V, W phase lines UL1, VL1, WL1, and motor connected to inverter 36 via U, V, W phase lines UL2, VL2, WL2. Generator MG2 is included in power output device 16 shown in FIG. Motor generator MG <b> 1 is a three-phase AC synchronous motor generator and generates driving force by AC power received from inverter 34. Motor generator MG1 generates AC power using the power of an engine (not shown, the same applies hereinafter) included in power output device 16, and supplies the generated AC power to inverter 34. Motor generator MG <b> 2 is a three-phase AC synchronous motor, and generates driving force by AC power received from inverter 36.

  The system main relay 42 connected between the boost converter 32 included in the PCU 14 and the battery 12 is a relay for connecting / disconnecting the battery 12 to / from the PCU 14. When connecting the battery 12 to the boost converter 32 based on a control command from the control device 40, the system main relay 42 first closes the relay SMR2 connected in series with the resistor R, and then closes the relay SMR1. Inrush current is prevented from flowing from the battery 12 to the boost converter 32.

  Boost converter 32 includes power transistors Q1 and Q2, diodes D1 and D2, and a reactor L. Power transistors Q1 and Q2 are connected in series between power supply line PL2 and ground line SL, and receive a control signal from control device 40 as a base. Diodes D1 and D2 are connected between the collector and emitter of each of the power transistors Q1 and Q2 so that current flows from the emitter side to the collector side.

  Reactor L has one end connected to power supply line PL1 connected to the positive electrode of battery 12 via system main relay 42, and the other end connected to a connection point between the emitter of power transistor Q1 and the collector of power transistor Q2. .

  Boost converter 32 boosts the DC voltage from battery 12 by accumulating current flowing according to the switching operation of power transistor Q2 as magnetic field energy in reactor L, and power transistor Q2 is turned off by boosting the boosted voltage. The power is supplied to the power supply line PL2 via the diode D1 in synchronization with the timing. Boost converter 32 steps down the DC voltage received from inverter 34 to the voltage level of battery 12 and charges battery 12.

  Inverter 34 includes U-phase arm 52, V-phase arm 54, and W-phase arm 56. U-phase arm 52, V-phase arm 54 and W-phase arm 56 are connected in parallel between power supply line PL2 and ground line SL. The U-phase arm 52 includes power transistors Q11 and Q12 connected in series, the V-phase arm 54 includes power transistors Q13 and Q14 connected in series, and the W-phase arm 56 includes power connected in series. It consists of transistors Q15 and Q16. Further, diodes D11 to D16 for flowing current from the emitter side to the collector side are connected between the collector and emitter of each of the power transistors Q11 to Q16.

  The connection point of each power transistor in each phase arm is connected to the anti-neutral point side of each phase coil of motor generator MG1 via U, V, W phase lines UL1, VL1, WL1.

  Inverter 34 converts a DC voltage received from power supply line PL2 into a three-phase AC voltage based on a control signal from control device 40, and converts the converted three-phase AC voltage into each of U, V, and W phase lines UL1,. Output to motor generator MG1 via VL1 and WL1. Inverter 34 rectifies the three-phase AC voltage received from motor generator MG1 via U, V, and W phase lines UL1, VL1, and WL1 into a DC voltage and supplies it to power supply line PL2.

  Inverter 36 includes a U-phase arm 62, a V-phase arm 64, and a W-phase arm 66. U-phase arm 62, V-phase arm 64 and W-phase arm 66 are connected in parallel between power supply line PL2 and ground line SL. The U-phase arm 62 includes power transistors Q21 and Q22 connected in series, the V-phase arm 64 includes power transistors Q23 and Q24 connected in series, and the W-phase arm 66 includes power connected in series. It consists of transistors Q25 and Q26. In addition, diodes D21 to D26 that allow current to flow from the emitter side to the collector side are connected between the collectors and emitters of the power transistors Q21 to Q26, respectively.

  Also in inverter 36, the connection point of each power transistor in each phase arm is on the anti-neutral point side of each phase coil of motor generator MG2 via U, V, W phase lines UL2, VL2, WL2, respectively. It is connected.

  Inverter 36 converts a DC voltage received from power supply line PL2 into a three-phase AC voltage based on a control signal from control device 40, and converts the converted three-phase AC voltage into each of U, V, and W phase lines UL2, UL2. Output to motor generator MG2 via VL2 and WL2.

  Capacitor C1 is connected between power supply line PL1 and ground line SL, and reduces the influence on battery 12 and boost converter 32 due to voltage fluctuation. Capacitor C2 is connected between power supply line PL2 and ground line SL, and reduces the influence on inverters 34 and 36 and boost converter 32 due to voltage fluctuation.

  DC / AC conversion device 38 is connected to power supply line PL2 and ground line SL. The DC / AC converter 38 operates when the hybrid vehicle 10 is used as a commercial power source while the hybrid vehicle 10 is stopped. That is, when hybrid vehicle 10 is stopped, DC / AC converter 38 receives a DC voltage obtained by boosting battery voltage of battery 12 by boost converter 32 from power supply line PL2, and converts the received DC voltage into a commercial AC voltage. Then, the commercial AC voltage is output to the electric load 44 connected to an AC output outlet 15 (not shown). DC / AC converter 38 may also convert the DC voltage generated by motor generator MG1 and rectified by inverter 34 and supplied to power supply line PL2 into a commercial AC voltage and output it to electric load 44. it can.

  Control device 40 calculates each phase coil voltage of motor generator MG1 based on the motor torque command value, each phase current value of motor generator MG1, and the input voltage of inverter 34 (that is, the voltage of power supply line PL2). Based on the result, a PWM (Pulse Width Modulation) signal for turning on / off the power transistors Q11 to Q16 is generated and output to the inverter 34. Similarly, control device 40 generates a PWM signal for turning on / off power transistors Q21 to Q26 and outputs the PWM signal to inverter 36.

  Control device 40 also sets the duty ratio of power transistors Q1 and Q2 for optimizing the input voltage of inverters 34 and 36 (that is, the voltage of power supply line PL2) based on the above-described motor torque command value and motor rotational speed. Based on the calculation result, a PWM signal for turning on / off the power transistors Q1, Q2 is generated and output to the boost converter 32.

  Further, control device 40 converts the AC power generated by motor generator MG1 into DC power and charges battery 12, so that switching operation of power transistors Q11-Q16, Q1, Q2 in inverter 34 and boost converter 32 is performed. Control.

  Further, when the hybrid vehicle 10 is used as a commercial power source while the hybrid vehicle 10 is stopped, the control device 40 turns on the relays SMR1 and SMR2 of the system main relay 42, and the boost converter 32 and the DC / AC power source. The device 38 is driven and controlled. That is, when the DC / AC converter 38 is activated in response to a commercial power usage request from the user while the hybrid vehicle 10 is stopped, the controller 40 turns on the system main relay 42 and boosts the battery 12. It is electrically connected to the converter 32. Then, control device 40 controls boost converter 32 to boost the DC voltage from battery 12, converts the boosted voltage to a commercial AC voltage, and outputs it to external electrical load 44. The AC converter 38 is controlled.

  Here, control device 40 boosts the battery voltage of battery 12 (for example, about 200 V) to a voltage level (for example, about 650 V) that can be boosted by boost converter 32 when the power consumption of electric load 44 is equal to or greater than a predetermined amount. Thus, the boost converter 32 is controlled. On the other hand, when power consumption of electric load 44 is less than a predetermined amount, control device 40 controls boost converter 32 so that the boost voltage is lower than the voltage that can be boosted.

  Furthermore, when the hybrid vehicle 10 is used as a commercial power source while the hybrid vehicle 10 is stopped, the control device 40 causes the motor generator MG1 to control the battery 12 if the SOC (State of Charge) of the battery 12 is less than a predetermined amount. A connected engine (not shown, the same applies hereinafter) is driven to drive and control the inverter 34 and the DC / AC power supply 38. That is, when control device 40 determines that the SOC of battery 12 is less than a predetermined amount, control device 40 controls the drive of the engine to cause motor generator MG1 to generate power. Then, control device 40 controls inverter 34 so as to rectify and supply the power generated by motor generator MG1 to power supply line PL2, and convert the DC voltage supplied from inverter 34 to power supply line PL2 to a commercial AC voltage. The DC / AC converter 38 is controlled so as to be converted and output to the external electric load 44.

  In the above description, the DC / AC converter 38 constitutes a “voltage converter”.

  In PCU 14, boost converter 32 boosts the battery voltage of battery 12, and inverters 34 and 36 convert the boosted DC voltage into a three-phase AC voltage to drive motor generators MG1 and MG2, respectively. Inverter 34 rectifies the three-phase AC voltage generated by motor generator MG1 connected to the engine into a DC voltage, and boost converter 32 steps down the DC voltage from inverter 34 to the voltage level of battery 12. The battery 12 is charged.

  Further, in this PCU 14, while the hybrid vehicle 10 is stopped, the boost converter 32 boosts the battery voltage of the battery 12, and the DC / AC converter 38 converts the boosted DC voltage into a commercial AC voltage. Output to an external electrical load 44. Here, if the control device 40 determines that the SOC of the battery 12 is not sufficient, the engine connected to the motor generator MG1 is driven, and the motor generator MG1 receives power from the engine to generate power. Then, inverter 34 rectifies the three-phase AC voltage generated by motor generator MG1 into a DC voltage and supplies it to power supply line PL2, and DC / AC converter 38 converts the DC voltage into a commercial AC voltage. Output to an external electrical load 44.

  A characteristic point of the PCU 14 is that a DC / AC converter 38 is connected to a power supply line PL2 that is controlled to a voltage higher than the battery voltage of the battery 12. As a result, the input voltage of the DC / AC converter 38 can be increased, so that the input current of the DC / AC converter 38 can be reduced while securing the output power to the electric load 44. Therefore, the DC / AC converter is directly connected to the battery, and the power element constituting the DC / AC converter 38 can be downsized as compared with the prior art in which the input voltage of the DC / AC converter is the battery voltage. Low loss can be achieved.

  Further, if the size of the power element constituting the DC / AC converter 38 is the same as the size of the power element constituting the above-described prior art, the input voltage of the DC / AC converter 38 is increased. Only a large amount of power can be output to the electric load 44.

  FIG. 3 is a flowchart showing commercial AC voltage output control by the PCU 14 shown in FIG.

  Referring to FIG. 3, when switch of DC / AC conversion device 38 is turned on by the user of hybrid vehicle 10 (step S <b> 2), control device 40 confirms whether hybrid vehicle 10 is in a stopped state. (Step S4). When control device 40 determines that hybrid vehicle 10 is not in a stopped state (NO in step S4), the process is terminated.

  On the other hand, when confirming that hybrid vehicle 10 is in a stopped state (YES in step S4), control device 40 turns on system main relay 42 (step S6). Then, the control device 40 calculates the SOC of the battery 12 in order to check the state of charge of the battery 12 (step S8), and the SOC is smaller than the predetermined amount S0 that can output commercial AC power by the power from the battery 12. It is checked whether or not (step S10).

  If the control device 40 determines that the SOC of the battery 12 is less than the predetermined amount S0 (YES in step S10), the control device 40 drives the engine connected to the motor generator MG1 (step S12), and the motor generator Commercial AC power output control via MG1 is executed (step S14).

  That is, in this case, motor generator MG1 generates electric power by driving the engine, and motor generator MG1 outputs the generated electric power to inverter 34. Inverter 34 rectifies the three-phase AC power received from motor generator MG1 and supplies it to power supply line PL2. Then, by operating the power transistors Q1 and Q2 of the boost converter 32 according to the control signal from the control device 40, the DC power of the power line PL2 is adjusted to a predetermined voltage level, and the DC / AC conversion device 38 The adjusted DC voltage of power supply line PL2 is converted into a commercial AC voltage and output to electric load 44.

  On the other hand, when the control device 40 determines that the SOC of the battery 12 is equal to or greater than the predetermined amount S0 (NO in step S10), the control device 40 determines that the commercial AC power can be generated by the battery 12, and the battery The output control of the commercial AC power via 12 is executed (step S16).

  That is, in this case, boost converter 32 boosts the DC voltage output from battery 12 in accordance with a control signal from control device 40, and supplies the boosted voltage to power supply line PL2. DC / AC converter 38 converts the DC voltage of power supply line PL <b> 2 boosted by boost converter 32 into a commercial AC voltage and outputs the commercial AC voltage to electric load 44.

  FIG. 4 is a flowchart showing voltage control by the boost converter 32 when the commercial AC voltage output control by the PCU 14 is executed.

  Referring to FIG. 4, control device 40 calculates the amount of power consumed by electric load 44 based on the current value output from DC / AC conversion device 38 to electric load 44 (step S <b> 22). Then, the control device 40 determines whether or not the amount of power consumed by the electrical load 44 is less than the predetermined amount Pth (step S24).

  When control device 40 determines that the amount of power consumed by electric load 44 is less than predetermined amount Pth (YES in step S24), boost converter 32 uses power supply line PL2 based on the control signal from control device 40. The voltage is controlled to a predetermined voltage level lower than the maximum voltage that can be boosted (step S26).

  On the other hand, when controller 40 determines that the amount of power consumed by electric load 44 is equal to or greater than predetermined amount Pth (NO in step S24), boost converter 32 controls the voltage of power supply line PL2 to the maximum voltage that can be boosted. (Step S28).

  That is, in this PCU 14, by generating commercial AC power using the boosted voltage obtained by boosting the battery voltage of the battery 12, as described above, the power element in the DC / AC converter 38 can be reduced in size and reduced in loss. As shown, when the power consumption of the electric load 44 is small, the load of the boost converter 32 is reduced to improve the overall efficiency of the PCU 14 and is lower than the maximum voltage that can be boosted by the boost converter 32. The boosted voltage is controlled to the voltage level.

  As described above, according to this embodiment, since the DC / AC converter 38 is connected to the power supply line PL2 that is controlled to a voltage higher than the battery voltage of the battery 12, the DC / AC converter 38 is connected. The input voltage can be increased. Therefore, it is possible to reduce the input current of the DC / AC converter 38 while securing the amount of output power to the external electric load 44. As a result, the power elements constituting the DC / AC converter 38 are downsized. it can. In addition, by reducing the size of the power element that constitutes the DC / AC converter 38, the DC / AC converter 38 can be reduced in size, reduced in loss, reduced in cost, and the like.

  Further, if the size of the power element constituting the DC / AC conversion device 38 is set to the conventional level, the input voltage of the DC / AC conversion device 38 is increased, so that larger electric power is output to the electric load 44. be able to.

  Further, according to this embodiment, since it is possible to switch whether the output control of the commercial AC power in the PCU 14 is via the battery 12 or via the motor generator MG1, the state of charge of the battery 12 and the engine are operated. It is possible to realize commercial AC power output control in accordance with the situation, such as in an ambient situation that you do not want to cause.

  Further, according to this embodiment, when the output control of the commercial AC power in the PCU 14 is executed, the boost converter 32 is subjected to variable voltage control according to the load condition of the electric load 44. Is small, the boost ratio in the boost converter 32 is reduced, and as a result, the efficiency of the entire PCU 14 including the boost converter 32 is improved.

  In the above, the commercial AC voltage output control by the PCU 14 switches between the motor generator MG1 and the battery 12 based on the SOC of the battery 12, but either output route is selected. It may be one that can be arbitrarily selected by the user.

  In the above description, boost converter 32 performs maximum voltage control capable of boosting or low voltage control for boosting to a voltage lower than the maximum voltage depending on the load condition of electric load 44. The converter 32 may boost the voltage to a maximum voltage that can be boosted regardless of the load condition of the electric load 44. In this case, the boost control of the boost converter 32 when the commercial AC power is output to the outside is simplified.

  In the above description, the output control of the commercial AC voltage by the PCU 14 is executed while the hybrid vehicle 10 is stopped. However, the output control of the commercial AC voltage may be executed while the vehicle is running. In this case, the voltage level of the power supply line PL2 boosted by the boost converter 32 is not always the maximum voltage, but varies between the maximum voltage and the battery voltage of the battery 12 according to the driving conditions of the hybrid vehicle 10, so that the DC It is preferable to provide a certain restriction on the output from the / AC converter 38. Alternatively, an alarm may be output to the display device when the power consumption of the electric load 44 exceeds a predetermined amount.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

1 is a schematic diagram showing a configuration of a hybrid vehicle shown as an example of a vehicle equipped with a voltage conversion device according to the present invention. It is a circuit diagram which shows the structure of the principal part of PCU shown in FIG. It is a flowchart which shows the output control of the commercial alternating voltage by PCU shown in FIG. FIG. 3 is a flowchart showing voltage control by a boost converter when commercial AC voltage output control by the PCU shown in FIG. 2 is executed.

Explanation of symbols

  10 hybrid vehicle, 12 battery, 14 PCU, 15 AC output outlet, 16 power output device, 18 DG, 20R, 20L front wheel, 22R, 22L rear wheel, 24R, 24L front seat, 26 rear seat, 32 boost converter, 34, 36 Inverter, 38 DC / AC converter, 40 controller, 42 system main relay, 44 electrical load, 52, 62 U-phase arm, 54, 64 V-phase arm, 56, 66 W-phase arm, MG1, MG2 motor generator, C1 , C2 capacitor, PL1, PL2 power line, SL ground line, UL1, UL2 U phase line, VL1, VL2 V phase line, WL1, WL2 W phase line, Q1, Q2, Q11-Q16, Q21-Q26 power transistor, D1 , D2, D11 D16, D21-D26 diode, L reactor, SMR1, SMR2 relay, R resistance.

Claims (13)

A DC power source for generating a first DC voltage;
A boost converter that receives the first DC voltage output from the DC power supply and boosts the received first DC voltage to a second DC voltage;
A voltage converter that receives the second DC voltage boosted by the boost converter, converts the received second DC voltage into a predetermined AC voltage, and outputs the AC voltage to a commercial voltage utilization device connected to an external output terminal and,
An inverter connected to the step-up converter, receiving the second DC voltage from the step-up converter, and driving and controlling the rotating electrical machine;
A control device for controlling the operation of the boost converter, the inverter and the voltage converter;
The voltage converter is connected to a power line connecting the inverter to the boost converter,
The inverter receives a voltage generated by the rotating electrical machine, and further supplies the received voltage to the power line.
The voltage converter receives a supply voltage supplied to the power line from the inverter, converts the received supply voltage into the predetermined AC voltage, and further outputs it to the commercial voltage using device,
The control device converts the second DC voltage boosted by the boost converter into the predetermined AC voltage and outputs it to the commercial voltage using device when a remaining capacity of the DC power source is equal to or greater than a predetermined amount. The boost converter and the voltage converter are controlled as described above, and when the remaining capacity of the DC power source is less than the predetermined amount, the power generated by the rotating electrical machine and supplied to the power line by the inverter The power supply system which controls the said inverter and the said voltage converter so that a voltage is converted into the said predetermined | prescribed alternating voltage and output to the said commercial voltage utilization apparatus . 2. The power supply system according to claim 1 , wherein the boost converter changes a voltage level of the second DC voltage based on power consumption by the commercial voltage using device. The boost converter boosts the first DC voltage so that the second DC voltage becomes a maximum voltage that can be boosted by the boost converter when the power consumption by the commercial voltage using device is a predetermined amount or more. , when said power consumption is less than the predetermined amount, the second DC voltage to boost the first DC voltage so that the voltage level lower than the maximum voltage, the power supply according to claim 2 system. The power supply system according to any one of claims 1 to 3 , wherein the predetermined AC voltage is a commercial AC voltage. A vehicle provided with the power supply system of any one of Claims 1-4 . The vehicle according to claim 5 , wherein the voltage conversion device is driven when the vehicle is stopped. The voltage conversion device is further driven when the vehicle is traveling, and limits the power output to the commercial voltage utilization device when the power consumption by the commercial voltage utilization device exceeds a predetermined amount during the traveling of the vehicle. The vehicle according to claim 6 . A rotary electric machine is driven using a second DC voltage obtained by boosting a first DC voltage generated by a DC power supply, and the boosted second DC voltage is converted into a predetermined AC voltage to be output to an external output terminal. A method for controlling a power supply system capable of outputting to a commercial voltage using device connected to
A first step of calculating a remaining capacity of the DC power supply;
A second step of converting the boosted second DC voltage into the predetermined AC voltage and outputting the converted voltage to the commercial voltage utilization device when the remaining capacity calculated in the first step is equal to or greater than a predetermined amount; When,
When the remaining capacity calculated in the first step is less than the predetermined amount, the power generated by the rotating electrical machine is converted into the predetermined AC voltage and output to the commercial voltage using device. And a method for controlling the power supply system. A fourth step of confirming a stop state of the vehicle on which the power supply system is mounted;
9. The power supply system according to claim 8 , wherein when the stop state of the vehicle is confirmed in the fourth step, the predetermined AC voltage is output to the commercial voltage using device in the second or third step. Control method. A fifth step of calculating power consumption by the commercial voltage using device;
The power supply system control according to claim 8, further comprising: a sixth step of controlling a voltage level of the second DC voltage based on the power consumption calculated in the fifth step. Method. The sixth step includes
A first sub-step of controlling the second DC voltage to a voltage level lower than a maximum voltage that can be boosted when the power consumption calculated in the fifth step is less than a predetermined amount;
When the power consumption amount calculated in the fifth step is not less than the predetermined amount, and a second sub-step of controlling the second DC voltage to the voltage level of the maximum voltage, in claim 10 The power supply system control method described. A seventh step of confirming a stop state of the vehicle on which the power supply system is mounted;
When the stop state of the vehicle is confirmed in the seventh step, the second DC voltage whose voltage level is controlled in the sixth step is converted into the predetermined AC voltage to use the commercial voltage. The power system control method according to any one of claims 8 to 11 , further comprising an eighth step of outputting to a device. The method of controlling a power supply system according to any one of claims 8 to 12 , wherein the predetermined AC voltage is a commercial AC voltage.

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