JP5446836B2 - Power supply device and vehicle - Google Patents

Description

  The present invention relates to a power supply device, a control method therefor, and a vehicle, and more particularly, to a power supply device that supplies power to a device that operates with electric power, a control method therefor, and a vehicle including such a power supply device.

  Conventionally, this type of power supply device includes a DC power source such as a secondary battery, and a boost converter that boosts power from the DC power source to a system voltage and supplies it to a motor via an inverter. There has been proposed one that drives a boost converter using feedback control for reducing a deviation between a target value and a detected value (see, for example, Patent Document 1). In this apparatus, the energization duty ratio of the switching element of the boost converter is calculated by feedback control so that the deviation between the target value of the system voltage and the detected value becomes small.

JP 2008-271649 A

  Some boosting converters included in the above-described power supply device can supply electric power from a DC power supply to a motor without boosting. In such a power supply device including a boost converter, while the electric power from the DC power supply is being supplied to the motor without being boosted, the difference between the target value and the detected value of the system voltage is increased to some extent, thereby boosting the voltage by the boost converter. It is conceivable to start, but when boosting by the boost converter is started, the system voltage rises rapidly due to the large deviation between the target value of the system voltage and the detected value, and the current from the DC power supply becomes excessive. was there. In addition, when the current from the DC power supply becomes excessive in this way, the energization duty ratio is calculated by reflecting the voltage ratio between the DC power supply voltage and the target value of the system voltage in the feedforward term as the basic value of the energization duty ratio. In the apparatus, the lower the voltage of the DC power supply, the greater the degree of step-up from the voltage of the DC power supply.

  The power supply device, the control method thereof, and the vehicle according to the present invention more appropriately suppress the current from the secondary battery from becoming excessive when the boosting supply to boost the power from the battery system and supply it to the equipment system is started. The main purpose is to do.

  The power supply apparatus, the control method thereof, and the vehicle of the present invention employ the following means in order to achieve the main object described above.

The power supply device of the present invention is
A power supply device that supplies power to a device that operates by power,
A secondary battery,
Non-boosting supply is possible in which the power from the battery system to which the secondary battery is connected is not boosted to the equipment system to which the equipment is connected, and the power from the battery system is boosted to increase the power from the battery system. A booster circuit capable of supplying boosting power to
While the non-boosting supply is being performed, a required voltage required for the device system exceeds a predetermined voltage that is predetermined as a voltage for starting the boosting supply as compared with the voltage of the battery system. Until the predetermined release condition determined in advance is satisfied, the feedforward term corresponding to the voltage ratio between the voltage of the battery system and the required voltage is used after the predetermined release condition is satisfied. Obtained by multiplying the voltage difference between the required voltage and the device system voltage by an execution gain whose absolute value tends to decrease as the battery system voltage decreases within a range where the absolute value is smaller than the predetermined gain. A boost control means for controlling the booster circuit so that the booster circuit is driven by a command value set based on a feedback term;
It is a summary to provide.

  In the power supply device according to the present invention, the non-boosting supply is performed while the power from the battery system to which the secondary battery is connected is supplied to the equipment system to which the device operated by the power is connected without being boosted. The required voltage required for the device system is greater than the voltage of the battery system, exceeding a predetermined voltage that is predetermined as a voltage for boosting the power from the battery system and starting the boost supply to be supplied to the device system. Until a predetermined release condition is established, the feedforward term corresponding to the voltage ratio between the battery system voltage and the required voltage and a predetermined gain used after the predetermined release condition is established. The command value set based on the feedback term obtained by multiplying the voltage difference between the required voltage and the device system voltage by the execution gain that tends to decrease as the battery system voltage decreases within the range of By Booster circuit controls the booster circuit to be driven. Therefore, since the execution gain smaller than the predetermined gain is used when the boosting supply is started, the degree of increase in the voltage of the device system can be suppressed as compared with the case where the predetermined gain is used. In addition, since the execution gain that tends to decrease as the voltage of the battery system decreases when the boosting supply is started, the degree of increase in the voltage of the apparatus system can be more appropriately suppressed. As a result, it is possible to more appropriately suppress an excessive current from the secondary battery when the boosting supply is started.

  In such a power supply device of the present invention, the boost control means determines that the amount of increase in the voltage of the device system per unit time is excessive from the secondary battery until the predetermined release condition is satisfied. From a voltage of the device system to the required voltage at a predetermined rate as a rate for suppressing an excessive current from the secondary battery. It is also possible to use means for controlling the booster circuit using a voltage that increases toward the required voltage instead of the required voltage. By so doing, it is possible to more reliably suppress the current from the secondary battery from becoming excessive when boosting supply is started.

  Further, in the power supply device of the present invention, the booster circuit is a circuit that performs the boosting supply by switching two switching elements connected in series between a positive electrode bus and a negative electrode bus of the power line of the equipment system. The boost control means sets a voltage that is predetermined as a value larger than an upper limit of a voltage range in which the boost supply cannot be started due to a dead time as a time when both of the two switching elements should be turned off. It can also be a means for controlling using the predetermined voltage.

  The vehicle of the present invention is a power supply device of the present invention according to any one of the above-described aspects, that is, a power supply device that basically supplies power to a device that operates by power, and includes a secondary battery and the secondary battery. Non-boosted supply is possible in which the power from the battery system to which the battery is connected is not boosted, and the power from the battery system is boosted and supplied to the device system. A boosting circuit capable of boosting supply, and a voltage required for the device system as a voltage for starting the boosting supply as compared with the voltage of the battery system during the non-boosting supply. A feed-forward term corresponding to a voltage ratio between the voltage of the battery system and the required voltage until the predetermined release condition is established after the predetermined voltage is increased beyond the predetermined voltage, and the predetermined voltage After the release condition is satisfied An execution gain whose absolute value tends to decrease as the voltage of the battery system decreases within a range in which the absolute value becomes smaller than a predetermined gain is obtained by multiplying the voltage difference between the required voltage and the voltage of the device system. And a step-up control means for controlling the step-up circuit so that the step-up circuit is driven by a command value set based on the feedback term, and output power for traveling as the device And a motor.

  Since the vehicle according to the present invention is equipped with the power supply device according to any one of the above-described aspects, the effect of the power supply device according to the present invention, for example, the current from the secondary battery is excessive when starting the boosting supply. It is possible to achieve the same effect as the effect that can be appropriately suppressed.

The control method of the power supply device of the present invention is as follows:
Non-boosted supply is possible for supplying a secondary battery and a device system connected to a device operated by power without boosting the power from the battery system to which the secondary battery is connected and from the battery system. A method of controlling a power supply device comprising: a booster circuit capable of boosting and supplying power to the device system by boosting power;
While the non-boosting supply is being performed, a required voltage required for the device system exceeds a predetermined voltage that is predetermined as a voltage for starting the boosting supply as compared with the voltage of the battery system. Until the predetermined release condition determined in advance is satisfied, the feedforward term corresponding to the voltage ratio between the voltage of the battery system and the required voltage is used after the predetermined release condition is satisfied. Obtained by multiplying the voltage difference between the required voltage and the device system voltage by an execution gain whose absolute value tends to decrease as the battery system voltage decreases within a range where the absolute value is smaller than the predetermined gain. Controlling the booster circuit so that the booster circuit is driven by a command value set based on a feedback term;
It is characterized by that.

  In the control method of the power supply device of the present invention, non-boosting supply is performed in which a device that is operated by electric power is supplied to a device system that is connected to a power source without boosting the power from the battery system to which the secondary battery is connected. During the process, the required voltage required for the device system compared to the voltage of the battery system increases a power from the battery system and starts a boost supply to be supplied to the device system. From the time when the predetermined release condition is established, the feedforward term corresponding to the voltage ratio between the voltage of the battery system and the required voltage is used, and after the predetermined release condition is established. It is set based on a feedback term obtained by multiplying the voltage difference between the required voltage and the device system voltage by the execution gain that tends to decrease as the battery system voltage decreases within a range smaller than the predetermined gain. finger Booster circuit controls the booster circuit to be driven by the value. Therefore, since the execution gain smaller than the predetermined gain is used when the boosting supply is started, the degree of increase in the voltage of the device system can be suppressed as compared with the case where the predetermined gain is used. In addition, since the execution gain that tends to decrease as the voltage of the battery system decreases when the boosting supply is started, the degree of increase in the voltage of the apparatus system can be more appropriately suppressed. As a result, it is possible to more appropriately suppress an excessive current from the secondary battery when the boosting supply is started.

It is a block diagram which shows the outline of a structure of the electric vehicle 10 carrying the power supply device 20 as one Example of this invention. 2 is a configuration diagram showing an outline of a configuration of a power supply device 20 including a battery 26, a boost converter 28, and an electronic control unit 50. FIG. It is a flowchart which shows an example of the pressure | voltage rise start time control routine performed by the electronic control unit 50 of an Example. FIG. 6 is an explanatory diagram showing an example of dead time in boost converter. It is explanatory drawing which shows an example of the execution gain setting map of a proportional term. It is explanatory drawing which shows an example of the gain setting map for execution of an integral term. An example of a time change state of a voltage from the battery 26 and a voltage such as a high voltage system required voltage VHreq, a high voltage system voltage VH, and a low voltage system voltage VL when the boosting converter 28 starts boosting supply is shown. It is explanatory drawing.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an electric vehicle 10 equipped with a power supply device 20 as an embodiment of the present invention. As shown in the figure, the electric vehicle 10 according to the embodiment includes a motor 22 as a synchronous generator motor having a rotor connected to a drive shaft 32 connected to drive wheels 30a and 30b via a differential gear 31, and a motor 22. An inverter 24 for driving, a battery 26 configured as a secondary battery such as a lithium ion battery, a boost converter 28 capable of boosting power from the battery 26 and supplying the boosted power to the inverter 24, and an electronic device for controlling the entire vehicle And a control unit 50. In addition, as a power supply device of an Example, the battery 26, the boost converter 28, and the electronic control unit 50 correspond mainly.

  FIG. 2 is a configuration diagram showing an outline of the configuration of the power supply device 20 including the battery 26, the boost converter 28, and the electronic control unit 50. As shown in the figure, the boost converter 28 includes two transistors T1 and T2, two diodes D1 and D2 connected in parallel to the transistors T1 and T2 in the reverse direction, and a reactor L. The two transistors T1 and T2 are respectively connected to the positive bus 40a and the negative bus 40b of the power line 40 of the inverter 24, and the reactor L is connected to the connection point. A positive terminal and a negative terminal of the battery 26 are connected to the reactor L and the negative bus 40b, respectively. Therefore, the on / off control of the transistors T1 and T2 boosts the voltage of the DC power of the battery 26 and supplies it to the inverter 24, or reduces the DC voltage acting on the positive bus 40a and the negative bus 40b. 26 can be charged. Further, a smoothing capacitor 42 is connected to the positive electrode bus 40a and the negative electrode bus 40b of the power line 40, and a smoothing capacitor 44 is connected to the reactor L and the negative electrode bus 40b. Hereinafter, the inverter 24 side from the boost converter 28 is referred to as a high voltage system, and the battery 26 side from the boost converter 28 is referred to as a low voltage system.

  The electronic control unit 50 is configured as a microprocessor centered on the CPU 52, and includes a ROM 54 for storing a processing program, a RAM 56 for temporarily storing data, and an input / output port (not shown) in addition to the CPU 52. The electronic control unit 50 includes a motor 22 and an inverter 24 such as a signal from a rotation position detection sensor (not shown) for detecting the rotation position of the rotor of the motor 22 and a phase current applied to the motor 22 detected by a current sensor (not shown). The state of the battery 26, such as signals from various sensors that detect the state of the battery, the battery temperature from a temperature sensor (not shown) that detects the temperature of the battery 26, and the battery voltage from a voltage sensor (not shown) installed between the terminals of the battery 26 , Signals from various sensors that detect the voltage, high voltage VH from the voltage sensor 43 that detects the voltage of the capacitor 42, low voltage VL from the voltage sensor 45 that detects the voltage of the capacitor 44, ignition switch Ignition signal from 60, shift position set to detect shift lever operating position The shift position from the driver 62, the accelerator opening from the accelerator pedal position sensor 64 that detects the depression amount of the accelerator pedal, the brake pedal position from the brake pedal position sensor 66 that detects the depression amount of the brake pedal, and the vehicle speed sensor 68 The vehicle speed is input via the input port. The electronic control unit 50 outputs a switching control signal to the switching element of the inverter 24 for driving and controlling the motor 22, a switching control signal to the transistors T1 and T2 of the boost converter 28, and the like. The electronic control unit 50 also calculates the rotational speed Nm of the motor 22 based on a signal from the rotational position detection sensor.

  The electric vehicle 10 of the embodiment basically travels by drive control described below that is executed by the electronic control unit 50. In the electronic control unit 50, first, a required torque required for the drive shaft 32 for traveling is set according to the accelerator opening from the accelerator pedal position sensor 64 and the vehicle speed from the vehicle speed sensor 68, and the battery 26 is charged. The required torque is set in the torque command Tm * of the motor 22 within the range of the input / output restriction as the maximum power that can be discharged, and the inverter 24 is set based on the rotational speed Nm of the motor 22 and the set torque command Tm *. The target voltage of the high voltage system to be applied is set, the inverter 24 is controlled to be driven by the torque command Tm * set by the motor 22, and the high voltage system voltage VH is set to the set target voltage. The boost converter 28 is switching-controlled. The electric vehicle 10 according to the embodiment travels by outputting the required torque corresponding to the accelerator opening to the drive shaft 32 within the range of the input / output restriction of the battery 26 by such control.

  Next, the operation of the power supply device 20 mounted on the electric vehicle 10 thus configured, particularly the operation when starting the supply to the high voltage system with the boosting of the electric power from the battery 26 (hereinafter referred to as boosting supply). explain. FIG. 3 is a flowchart illustrating an example of a boost start control routine executed by the electronic control unit 50 according to the embodiment. In this routine, while the electric power from the battery 26 is being supplied to the high voltage system without being boosted, the required voltage required for driving the motor 22 as compared to the low voltage system voltage VL (the required voltage described later). This is executed when (VHreq) becomes larger than the predetermined voltage Vstart. In the embodiment, the boost converter 28 when the power from the battery 26 is supplied to the high voltage system without being boosted is in a state where the transistor T1 is turned on and the transistor T2 is turned off. . In the embodiment, the predetermined voltage Vstart is generated by the boost converter 28 because of a dead time (a delay time for preventing a short circuit that may occur in the transistors T1 and T2) as a time when both the transistors T1 and T2 should be turned off. As a value slightly larger than the upper limit of the voltage range in which the boost supply cannot be started, a value determined in advance by experiments and analysis based on the characteristics of the boost converter 28 is used. FIG. 4 shows an example of dead time in the boost converter 28. In order to start the boost supply by the boost converter 28, in the embodiment, the ratio of the on-time of the transistor T1 in the switching period of the transistors T1 and T2 is made smaller than the value 1, and the ratio of the on-time of the transistor T2 is set to the value 0. As shown in the figure, a duty ratio (in the embodiment, switching of the transistors T1 and T2) in which the boosting supply by the boosting converter 28 cannot be started because it is necessary to secure a dead time in the switching cycle. The ratio of the on-time of the transistor T1 in the cycle). The predetermined voltage Vstart is set as a value slightly larger than the upper limit of the voltage range corresponding to the range of the duty ratio.

  When the step-up start control routine is executed, the CPU 52 of the electronic control unit 50 first starts the torque command Tm * of the motor 22, the rotational speed Nm of the motor 22, the high-voltage voltage VH from the voltage sensor 43, and the voltage sensor. A process of inputting data necessary for control such as the voltage VL of the low voltage system from 45 is executed (step S100). The torque command Tm * for the motor 22 is input as set in a drive control routine (not shown). Further, the rotation speed Nm of the motor 22 is input as a value calculated based on a signal from a rotation position detection sensor that detects the rotation position of the rotor of the motor 22.

  When the data is input in this manner, a voltage required for driving the motor 22, that is, a required voltage VHreq required for the high voltage system is set based on the torque command Tm * of the motor 22 and the rotation speed Nm (step S110). In the embodiment, the required voltage VHreq of the high voltage system is stored in the ROM 54 as a required voltage setting map by predetermining the relationship among the torque command Tm *, the rotational speed Nm, and the required voltage VHreq of the motor 22. When the torque command Tm * and the rotation speed Nm are given, the corresponding required voltage VHreq is derived from the stored map and set.

  Subsequently, a value obtained by subtracting the high voltage system voltage (previous VH) inputted when this routine was executed last time from the inputted high voltage system voltage VH is calculated as the voltage change amount ΔVH of the high voltage system (step S120). The low rate flag F indicating whether or not the rising rate of the voltage VH of the high voltage system is kept low is checked (step S130), and the calculated voltage change amount ΔVH of the high voltage system is compared with the predetermined change amount ΔVref. (Step S140). Here, the predetermined change amount ΔVref is used to determine whether or not the current from the battery 26 is excessive, and is determined in advance as a positive value through experiments and analysis based on the characteristics of the battery 26 and the like. Things can be used. Further, the low rate flag F is a flag in which the value 0 is set as an initial value, and the value 1 is held after the value 1 is set in order to keep the rising rate of the high voltage system voltage VH low.

  When the voltage change amount ΔVH of the high voltage system is less than the predetermined change amount ΔVref when the low rate flag F is 0, it is determined that the current from the battery 26 does not become excessive, and the set required voltage VHreq is used as the high voltage. The target voltage VH * to be applied to the system is set (step S150). When the low rate flag F is 0 and the voltage change amount ΔVH of the high voltage system is greater than or equal to the predetermined change amount ΔVref, the current from the battery 26 is It is determined that the value is excessive, and the value 1 is set in the low rate flag F (step S160), and the smaller one of the input voltage VH plus the predetermined rate value V1 and the required voltage VHreq. Is set as the target voltage VH * of the high voltage system (step S170). Here, the predetermined rate value V1 is a rate value for suppressing the current from the battery 26 from being excessive, and a value determined in advance through experiments and analysis based on the characteristics of the battery 26 and the boost converter 28 is used. It was. Note that once the value 1 is set in the low rate flag F, the low rate flag F is determined to be a value 1 in the next step S130, and gradually increases with the predetermined rate value V1 to the required voltage VHreq by the processing in step S170. Is set as the target voltage VH * of the high voltage system.

  When the target voltage VH * of the high voltage system is thus set, it is determined whether or not it is immediately after the execution of this routine is started (when the determination in step S180 is first executed) (step S180), and immediately after the start. When the command duty ratio D for driving the boost converter 28 is set using feedback control, the proportional term execution gain Kp and the integral term execution gain Ki are set to the low voltage system voltage. Based on VL (step S190), the command duty ratio D is set by the following equation (1) using the set execution gain Kp and execution gain Ki (step S200), and the set command duty ratio D Thus, switching control of the transistors T1 and T2 of the boost converter 28 is performed (step S210). Here, the expression (1) is a relational expression in the feedback control for setting the high voltage system voltage VH to the target voltage VH *. In the expression (1), the first term on the right side is the target voltage of the high voltage system. It is a feedforward term indicating the ratio of the voltage VL of the low voltage system to VH *, the second term on the right side is the proportional term of the feedback term, and the third term on the right side is the integral term of the feedback term. The switching control of the transistors T1 and T2 by the command duty ratio D is performed by switching the transistors T1 and T2 so that the ratio of the ON time of the transistor T1 in the switching period becomes the command duty ratio D. In the embodiment, the execution gain Kp and the execution gain Ki are stored in the ROM 54 as an execution gain setting map by predetermining the relationship between the low-voltage system voltage VL and the execution gain Kp and the execution gain Ki. When the low-voltage system voltage VL is applied, the corresponding execution gain Kp and execution gain Ki are derived and set from the stored maps. FIG. 5 shows an example of an execution gain setting map of the proportional term execution gain Kp, and FIG. 6 shows an example of an execution gain setting map of the integral term execution gain Ki. As shown in FIG. 5, the execution gain Kp is set to an upper limit voltage VLmax and a lower limit voltage VLmin as upper and lower limit values (upper and lower limit values corresponding to the storage amount of the voltage of the battery 26) of the low voltage system voltage VL. In the corresponding range, the lower the voltage VL of the low voltage system, the smaller the upper limit gain Kpmax corresponding to the upper limit voltage VLmax tends to decrease from the lower limit gain Kpmin corresponding to the lower limit voltage VLmin, and within a range smaller than the predetermined gain Kpref. Is set. Further, as shown in FIG. 6, the execution gain Ki also corresponds to the upper limit voltage VLmax as the low voltage system voltage VL decreases in the range corresponding to the upper limit voltage VLmax and the lower limit voltage VLmin of the low voltage system voltage VL. The upper limit gain Kimax is set so as to decrease from the upper limit gain Kimax to the lower limit gain Kimin corresponding to the lower limit voltage VLmin, and within a range smaller than the predetermined gain Kiref. Here, the predetermined gain Kpref and the predetermined gain Kiref are not used when starting boost supply by the boost converter 28, but are used when performing normal boost control after the release condition described below is satisfied. This is the gain of the proportional term and the integral term that can make the controllability (responsiveness in control) by the boost converter 28 relatively high. The upper and lower limit gains Kpmax and Kpmin and the upper and lower limit gains Kimax and Kimin are proportional terms and integrals for suppressing the current from the battery 26 to the extent allowed by the battery 26 within a range that does not impair the controllability of the boost converter 28. The upper and lower limits of the gain range of the term are determined in advance by experiments and analysis based on the characteristics of the battery 26 and the boost converter 28. Further, the execution gain Kp and the execution gain Ki are set to have the illustrated tendency because the feedforward term of the equation (1) decreases as the voltage VL of the low voltage system decreases, so that the command duty ratio D increases. This is based on the fact that the degree of increase of the voltage VH of the high voltage system is increased.

  D = VL / VH *-Kp (VH * -VH)-Ki∫ (VH * -VH) dt (1)

  When switching control of boost converter 28 is thus performed with command duty ratio D, it is determined whether or not high voltage system voltage VH has reached required voltage VHreq as a release condition for performing normal boost control (step S220). Considering that it is determined immediately after the execution of this routine is started, since the high-voltage system voltage VH is less than the required voltage VHreq, the process returns to step S100 and the processes of steps S100 to S220 are performed. Run repeatedly. Note that when the determination process of step S180 is performed for the second time, it is determined that it is not immediately after the execution of this routine is started, and the execution gain Kp and the execution gain Ki set immediately after the execution of this routine are started. The command duty ratio D is set by the above-described equation (1) and switching control of the boost converter 28 is performed (steps S200 and S210). In this way, while the processes of steps S100 to S200 are being repeatedly performed, when the high voltage system voltage VH reaches the required voltage VHreq in step S220 and the release condition is satisfied, this routine is terminated. When the boost start control routine is thus completed, normal boost control is performed by a boost control routine (not shown).

  FIG. 7 shows the time change between the voltage from the battery 26 and the voltage such as the required voltage VHreq of the high voltage system, the voltage VH of the high voltage system, the voltage VL of the low voltage system, etc. An example of the state is shown. Regarding the upper voltage in the figure, the broken line indicates the required voltage VHreq, the solid line indicates the high voltage system voltage VH, the two-dot chain line indicates the low voltage system voltage VL, regardless of the high voltage system voltage change ΔVH. Of the high voltage system in the comparative example when the normal predetermined gains Kpref and Kiref are used as the gain of the relational expression of the feedback control when the required voltage VHreq is set to the target voltage VH * and the command duty ratio D is set. Voltage VH is indicated by a chain line. In addition, regarding the current from the battery 26 on the lower side in the figure, the solid line indicates the example, and the alternate long and short dash line indicates the comparative example. As shown as a comparative example, when the difference between the required voltage VHreq and the low voltage system voltage VL (a voltage equal to the high voltage system voltage VH) exceeds the predetermined voltage Vstart at time t1, the boost operation by the boost converter 28 is performed. However, if the control using the normal predetermined gains Kpref and Kiref is performed, the voltage VH of the high voltage system rapidly rises, the current from the battery 26 becomes temporarily excessive, and the battery 26 is deteriorated. Is likely to occur. On the other hand, in the embodiment, since the execution gains Kp and Ki set smaller than the normal predetermined gains Kpref and Kiref are used, it is possible to suppress the voltage VH from rapidly increasing. Further, when the upper gains Kpmax and Kimax smaller than the normal predetermined gains Kpref and Kiref are used as the execution gains Kp and Ki regardless of the low-voltage system voltage VL, the voltage of the battery 26 is low and the low-voltage system When the voltage VL is low, there is a case where the increase of the high voltage system voltage VH cannot be suppressed to the level allowed by the battery 26, and the lower limit gain Kpmin smaller than the normal predetermined gains Kpref and Kiref. , Kimin regardless of the low-voltage system voltage VL, when the voltage of the battery 26 is high and the low-voltage system voltage VL is high, the degree of increase in the high-voltage system voltage VH is excessively suppressed and controllability is reduced. However, in the embodiment, the lower the voltage VL of the low voltage system corresponding to the voltage of the battery 26, the smaller. That tends to set execution gain Kp, is used Ki. Thereby, even when the influence of the feedforward term is large with respect to the command duty ratio D, the influence of the feedback term can be reduced, and the rapid increase in the voltage VH of the high voltage system can be more appropriately suppressed. . Further, the execution gains Kp and Ki set in this way are set within a range that does not impair the controllability of the boost converter 28. Therefore, depending on the driving state of the motor 22 and the inverter 24, the high voltage system voltage VH is set. May rise so much that the battery 26 is not allowed. For this reason, when the voltage change amount ΔVH of the voltage VH becomes equal to or greater than the predetermined change amount ΔVref at time t2, the value 1 is set in the low rate flag F, the high voltage system voltage VH reaches the required voltage VHreq, and the release condition is satisfied. Until time t3 when execution of the boost start control routine is stopped, the high voltage system voltage VH * is set to a value that gradually increases with the predetermined rate value V1 up to the required voltage VHreq. The degree of increase in VH is suppressed according to target voltage VH *. Thereby, it is possible to more reliably suppress an excessive current from the battery 26 when the boosting supply by the boosting converter 28 is started.

  According to the electric vehicle 10 equipped with the power supply device 20 of the embodiment described above, the low-voltage system is being supplied to the high-voltage system without increasing the power from the low-voltage system to which the battery 26 is connected. The voltage between the low voltage system voltage VL and the target voltage VH * until the release condition is satisfied after the required voltage VHreq required for the high voltage system exceeds the predetermined voltage Vstart after the required voltage VHreq exceeds the predetermined voltage VL. A feedforward term corresponding to the ratio, and an execution gain Kp that tends to decrease as the voltage VL of the low voltage system decreases within a range smaller than the normal predetermined gains Kpref and Kiref used after the cancellation condition is satisfied. , Ki and the feedback term obtained by multiplying the voltage difference between the target voltage VH * and the high voltage system voltage VH by a command duty ratio D set based on the feedback term. Since the switching control of the motor 28, the current from the battery 26 when starting the boosting supply by boost converter 28 can be more properly prevented from becoming excessive.

  In the electric vehicle 10 equipped with the power supply device 20 of the embodiment, when the voltage change amount ΔVH of the high-voltage system voltage VH becomes equal to or greater than the predetermined change amount ΔVref, the predetermined rate value V1 from the high-voltage system voltage VH at that time. The voltage gradually increasing up to the required voltage VHreq is set as the target voltage VH *. However, even in such a case, the required voltage VHreq may be set as the target voltage VH * as it is.

  In the electric vehicle 10 equipped with the power supply device 20 of the embodiment, as a predetermined voltage Vstart used when boosting supply by the boost converter 28 is started, dead as a time when both transistors T1 and T2 of the boost converter 28 should be turned off. Although a predetermined value is used as a value slightly larger than the upper limit of the voltage range in which the boost supply cannot be started due to time, instead of this, for example, the start and stop of the boost operation by the boost converter 28 A predetermined value or the like may be used in order to prevent the occurrence of frequent occurrences.

  In the electric vehicle 10 equipped with the power supply device 20 of the embodiment, it is assumed that the release condition for ending the control at the start of boosting is satisfied when the high-voltage system voltage VH reaches the required voltage VHreq. The release condition is satisfied when the voltage VH of the voltage system reaches the required voltage VHreq and, for example, a predetermined time has passed when it is determined that the control may be terminated after the control at the start of boosting is started. And so on.

  In the electric vehicle 10 equipped with the power supply device 20 of the embodiment, the command duty ratio D is set by subtracting the proportional term and the integral term from the feedforward term according to the above-described equation (1). The command duty ratio may be set by setting a negative value and adding a proportional term and an integral term to the feedforward term, or a command based on the feedforward term, the proportional term, the integral term, and further the derivative term. The duty ratio may be set, or the command duty ratio may be set based on the feedforward term and the proportional term.

  In the electric vehicle 10 equipped with the power supply device 20 of the embodiment, the execution gains Kp and Ki are set based on the low-voltage system voltage VL from the voltage sensor 45, but instead of this, The execution gains Kp and Ki may be set based on a battery voltage from a voltage sensor (not shown) installed between the terminals.

  In addition, the power supply is not limited to those applied to such electric vehicles, and is not limited to the power supply device mounted on a moving body such as a vehicle other than an automobile, a ship or an aircraft, or a power supply incorporated in a non-moving facility such as a construction facility. It may be in the form of a device. Furthermore, it is good also as a form of the control method of such a power supply device.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the motor 22 corresponds to “device”, the battery 26 corresponds to “secondary battery”, the boost converter 28 corresponds to “boost circuit”, and the power from the low voltage system is increased without being boosted. When starting the boost supply by the boost converter 28 during the supply to the voltage system, the target voltage VH * is set using the required voltage VHreq, and a predetermined gain for normal use based on the voltage VL of the low voltage system Execution gains Kp and Ki are set so that the smaller the voltage VL of the low voltage system is, the smaller the voltage VL is within the range smaller than Kpref and Kiref, and the voltage ratio between the low voltage system voltage VL and the target voltage VH * is supported. The command duty ratio D is set based on the feed forward term to be executed and the feedback term obtained by multiplying the execution gains Kp and Ki by the voltage difference between the target voltage VH * and the high voltage system voltage VH. The boost converter 28 the electronic control unit 50 executing the step-up start control routine of FIG. 3 for switching control corresponds to the "step-up control means."

  Here, the “device” is not limited to the motor 22 that outputs driving power, and any device that operates with electric power, such as a motor that outputs driving power that is not driving. It does not matter. The “secondary battery” is not limited to the battery 26, and any secondary battery may be used. The “boost circuit” is not limited to the boost converter 28 that boosts the power from the low voltage system to which the battery 26 is connected and supplies the boosted power to the high voltage system on the inverter 24 side. Booster circuit that can supply non-boosted power to equipment connected to the equipment without boosting the power from the battery system and boosts the power from the battery system and supplies it to the equipment system Anything can be used. The “boost control means” uses the required voltage VHreq as a target voltage when starting the boost supply by the boost converter 28 while the power from the low voltage system is being supplied to the high voltage system without being boosted. The execution gains Kp and Ki tend to decrease as the low voltage system voltage VL decreases within a range smaller than the normal predetermined gains Kpref and Kiref based on the low voltage system voltage VL. Set and multiply the voltage difference between the target voltage VH * and the high voltage system voltage VH by the feedforward term corresponding to the voltage ratio between the low voltage system voltage VL and the target voltage VH * and the execution gains Kp and Ki. The command duty ratio D is set based on the obtained feedback term, and the boost converter 28 is not limited to switching control, and non-boosted supply is performed. During the operation, the required voltage required for the device system compared to the voltage of the battery system becomes larger than the predetermined voltage that is predetermined as the voltage for starting the boost supply, and then the predetermined predetermined release is performed. Until the condition is satisfied, the battery is within the range where the absolute value is smaller than the feed-forward term corresponding to the voltage ratio between the battery system voltage and the required voltage and the predetermined gain used after the predetermined release condition is satisfied. The booster circuit is driven by the command value set based on the feedback term obtained by multiplying the voltage difference between the required voltage and the device system voltage by the execution gain that tends to decrease the absolute value as the system voltage decreases. Any device may be used as long as it controls the booster circuit.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power supply device manufacturing industry.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 20 Power supply device, 22 Motor, 24 Inverter, 26 Battery, 28 Boost converter, 30a, 30b Drive wheel, 31 Differential gear, 32 Drive shaft, 40 Power line, 40a Positive bus, 40b Negative bus, 42, 44 Capacitor, 43, 45 Voltage sensor, 50 Electronic control unit, 52 CPU, 54 ROM, 56 RAM, 60 Ignition switch, 62 Shift position sensor, 64 Accelerator pedal position sensor, 66 Brake pedal position sensor, 68 Vehicle speed sensor, D1, D2 Diode, T1, T2 transistor, L reactor.

Claims (3)

A power supply device that supplies power to a device that operates by power,
A secondary battery,
Non-boosting supply is possible in which the power from the battery system to which the secondary battery is connected is not boosted to the equipment system to which the equipment is connected, and the power from the battery system is boosted to increase the power from the battery system. A booster circuit capable of supplying boosting power to
While the non-boosting supply is being performed, a required voltage required for the device system exceeds a predetermined voltage that is predetermined as a voltage for starting the boosting supply as compared with the voltage of the battery system. Until the predetermined release condition determined in advance is satisfied, the feedforward term corresponding to the voltage ratio between the voltage of the battery system and the required voltage is used after the predetermined release condition is satisfied. Obtained by multiplying the voltage difference between the required voltage and the device system voltage by an execution gain whose absolute value tends to decrease as the battery system voltage decreases within a range where the absolute value is smaller than the predetermined gain. A boost control means for controlling the booster circuit so that the booster circuit is driven by a command value set based on a feedback term;
Equipped with a,
The booster circuit is a circuit that performs the boosting supply by switching two switching elements connected in series between a positive electrode bus and a negative electrode bus of the power line of the device system,
The step-up control means sets a voltage predetermined as a value larger than an upper limit of a voltage range in which the step-up supply cannot be started due to a dead time as a time when both of the two switching elements should be turned off. It is a means to control using as a predetermined voltage,
Power supply. The power supply device according to claim 1,
The boost control means is configured to determine that an increase amount per unit time of the voltage of the device system is greater than a predetermined amount that is determined to be an excessive current from the secondary battery until the predetermined release condition is satisfied. When the voltage from the device system voltage increases toward the required voltage at a predetermined rate as a rate for suppressing the current from the secondary battery from becoming excessive. Means for controlling the booster circuit using instead of voltage,
Power supply. The power supply device according to claim 1 or 2 ,
An electric motor that outputs driving power as the device;
A vehicle comprising:

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