JP5712950B2 - Power supply - Google Patents

Description

  More particularly, the present invention relates to a storage battery, a smoothing capacitor attached to a DC power line connected from the storage battery to a power consuming device, and a system connected between the storage battery and the smoothing capacitor of the DC power line. And a relay.

  Conventionally, as this type of power supply device, a first relay and a second relay attached to a positive electrode side and a negative electrode side of a power supply that supplies electric power to a motor, a switch connected in parallel to the first relay, and a switch in series It has been proposed to include a limiting resistor connected to the capacitor and a capacitor attached to the motor side from the first relay and the second relay (see, for example, Patent Document 1). In this device, before turning on the first relay and the second relay, the capacitor is precharged by turning on the second relay and the switch with the first relay turned off. At this time, when the temperature of the limiting resistor rises above the reference value, the switch is turned off to cut off the energization to the limiting resistor. This prevents overheating of the limiting resistor.

Japanese Patent Laying-Open No. 2005-312156

  In a power supply device mounted on a rechargeable hybrid vehicle or electric vehicle, a drive power line connecting the storage battery and the inverter circuit of the driving motor has a system main relay for disconnecting the storage battery, and a drive power line A driving smoothing capacitor for smoothing the voltage and a driving precharge circuit for precharging the driving smoothing capacitor before turning on the system main relay are provided, and charging power for charging the storage battery using an external power source The line includes a charging relay for disconnecting the storage battery, a charging smoothing capacitor for smoothing the voltage of the charging power line, and a charging precharge for precharging the charging smoothing capacitor before turning on the charging relay. Some circuits are provided. Both the drive precharge circuit and the charge precharge circuit are constituted by a resistor and a relay connected in series. For this reason, if the driving precharge circuit and the charging precharge circuit share a resistor, the number of components can be reduced.

  As described above, in the power supply device in which the driving precharge circuit and the charging precharge circuit share a resistor, the temperature of the resistor exceeds the reference temperature while the driving smoothing capacitor or the charging smoothing capacitor is being charged. When rising, it is preferable to inhibit energization of the resistor in order to prevent damage to the resistor. In this case, when charging the smoothing capacitor for charging, even if the temperature of the resistor reaches the reference value or higher, power is not supplied to the resistor. If an instruction is given, the drive smoothing capacitor cannot be charged, and the system may not be activated.

  The main purpose of the power supply device of the present invention is to protect a resistor from overheating and ensure a system start-up state in a device in which two precharge circuits that charge two smoothing capacitors each share a precharging resistor. To do.

  The power supply apparatus of the present invention employs the following means in order to achieve the main object described above.

The first power supply device of the present invention includes:
A first smoothing capacitor attached to a storage battery, a first power line connecting the storage battery and the power consuming device, and a positive electrode side and a negative electrode side between the storage battery and the first smoothing capacitor of the first power line A precharge resistor and a first precharge relay connected in series so as to bypass one of the first positive electrode side relay and the first negative electrode side relay, and the first positive electrode side relay and the negative electrode side relay. A first precharge circuit connected to the power supply device,
A second smoothing capacitor attached to a second power line connected to the storage battery to charge the storage battery using power from an external power source;
A second positive electrode side relay and a second negative electrode side relay attached to the positive electrode side and the negative electrode side between the storage battery and the second smoothing capacitor of the second power line;
A second precharge circuit comprising a second precharge relay connected in series with the precharge resistor and in parallel with the first precharge relay; and the precharge resistor;
When the temperature or estimated temperature of the precharging resistor is equal to or higher than a first threshold, precharging of the first smoothing capacitor by turning on the first precharging relay is prohibited, and the temperature or estimating of the precharging resistor is performed. Precharge control means for prohibiting precharging of the second smoothing capacitor by turning on the second precharge relay when the temperature is equal to or higher than a second threshold value that is lower than the first threshold value;
It is a summary to provide.

  In the first power supply device of the present invention, the first precharge circuit for precharging the first smoothing capacitor of the first power line connected to the power consuming device and the second smoothing capacitor of the second power line for charging are provided. The precharge resistor is shared by the second precharge circuit to be precharged. When the temperature of the precharge resistor or the estimated temperature is equal to or higher than the first threshold value, the precharge of the first smoothing capacitor is prohibited by turning on the first precharge relay, and the temperature or the estimated temperature of the precharge resistor is prohibited. Is equal to or greater than a second threshold value smaller than the first threshold value, the second precharge relay is prohibited from being precharged by turning on the second precharge relay. Therefore, even if the pre-charging of the second smoothing capacitor causes the pre-charging resistor temperature or the estimated temperature to exceed the second threshold and the pre-charging of the second smoothing capacitor is prohibited, the pre-charging resistor temperature or the estimated temperature is Since it is less than or equal to one threshold, precharging of the first smoothing capacitor is not prohibited. Therefore, even if precharge of the second smoothing capacitor is prohibited, the first smoothing capacitor can be precharged when the storage battery and the power consuming device are connected and the system is activated. Of course, when the temperature of the precharging resistor or the estimated temperature reaches or exceeds the first threshold by precharging the first smoothing capacitor, the precharging of the first smoothing capacitor is also prohibited. Can be prevented. As a result, the precharging resistor can be protected from overheating and the system startup state can be secured. Here, the “estimated temperature” of the precharging resistor may be based on, for example, a counter value that counts up when the precharging resistor is energized and counts down when it is not energized. In this case, when the current flowing through the precharging resistor when precharging the first smoothing capacitor is different from the current flowing through the precharging resistor when precharging the second smoothing capacitor, the count-up amount due to both precharging is set. It is preferable that they are different. In addition, “relay” means something that can be connected and disconnected, and is used as a concept that includes contactors and switches that function in the same manner.

  In such a first power supply device of the present invention, the second threshold value is a value obtained by subtracting a value corresponding to the temperature rise of the precharging resistor from the first threshold value when precharging the first smoothing capacitor. It can also be set as follows. In this way, even if the precharging of the second smoothing capacitor is prohibited, the precharging of the first smoothing capacitor can be completed.

  Further, in the first power supply device of the present invention, when the precharge control means prohibits the precharge of the first smoothing capacitor, the first positive side relay and the first negative side relay are both turned on. In addition, when prohibiting the precharging of the second smoothing capacitor, the second positive electrode side relay and the second negative electrode side relay may both be turned on. In this way, even if precharging of the first smoothing capacitor is prohibited during precharging of the first smoothing capacitor, both the first positive side relay and the first negative side relay are turned on. The power consuming device can be driven, and even if precharging of the second smoothing capacitor is prohibited during precharging of the second smoothing capacitor, both the second positive side relay and the second negative side relay are turned on. Therefore, the storage battery can be charged by an external power source.

The second power supply device of the present invention is
A first smoothing capacitor attached to a storage battery, a first power line connecting the storage battery and the power consuming device, and a positive electrode side and a negative electrode side between the storage battery and the first smoothing capacitor of the first power line A precharge resistor and a first precharge relay connected in series so as to bypass one of the first positive electrode side relay and the first negative electrode side relay, and the first positive electrode side relay and the negative electrode side relay. A first precharge circuit connected to the power supply device,
A second smoothing capacitor attached to a second power line connected to the storage battery to charge the storage battery using power from an external power source;
A second positive electrode side relay and a second negative electrode side relay attached to the positive electrode side and the negative electrode side between the storage battery and the second smoothing capacitor of the second power line;
A second precharge circuit comprising a second precharge relay connected in series with the precharge resistor and in parallel with the first precharge relay; and the precharge resistor;
When the first precharge relay is turned on to precharge the first smoothing capacitor, the first precharge relay is turned off when the temperature of the precharge resistor or the estimated temperature reaches a predetermined threshold value or more. In addition, when the first positive relay and the first negative relay are both turned on and the second precharge relay is turned on to precharge the second smoothing capacitor, the temperature of the precharge resistor is set. Alternatively, when the estimated temperature reaches the predetermined threshold value or more, the second precharge relay is turned off, the second positive electrode side relay and the second negative electrode side relay are both turned on, and the first positive electrode is further turned on. Precharge control means for turning on both the first relay and the first negative relay,
It is a summary to provide.

  In the second power supply device of the present invention, the first precharge circuit for precharging the first smoothing capacitor of the first power line connected to the power consuming device and the second smoothing capacitor of the second power line for charging are provided. The precharge resistor is shared by the second precharge circuit to be precharged. When the first precharge relay is turned on and the first smoothing capacitor is precharged, if the temperature of the precharge resistor or the estimated temperature reaches a predetermined threshold value or more, the first precharge relay is turned off. The first positive electrode side relay and the first negative electrode side relay are both turned on. As a result, overheating of the precharging resistor can be prevented and the power consuming device can be driven. When the second precharge relay is turned on and the second smoothing capacitor is precharged, if the temperature of the precharge resistor or the estimated temperature reaches a predetermined threshold value or more, the second precharge relay is turned off. The second positive side relay and the second negative side relay are both turned on, and the first positive side relay and the first negative side relay are both turned on. Thereby, overheating of the precharging resistor can be prevented, the storage battery can be charged, and the power consuming device can be driven. As a result, the precharging resistor can be protected from overheating and the system startup state can be secured. Here, the “estimated temperature” of the precharging resistor may be based on, for example, a counter value that counts up when the precharging resistor is energized and counts down when it is not energized. In this case, if the current flowing through the precharging resistor when precharging the first smoothing capacitor and the current flowing through the precharging resistor when precharging the second smoothing capacitor are different, the count-up amount due to both prechargings Are preferably different. In addition, “relay” means something that can be connected and disconnected, and is used as a concept that includes contactors and switches that function in the same manner.

It is a block diagram which shows the outline of a structure of the power supply device 20 as one Example of this invention. It is a flowchart which shows an example of the relay connection process (SMR connection process) for drive devices. It is a flowchart which shows an example of the relay connection process for chargers (CHR connection process). It is a flowchart which shows an example of the relay connection process (CHR connection process) for chargers of a modification.

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

  FIG. 1 is a configuration diagram showing an outline of a configuration of a power supply device 20 as an embodiment of the present invention. The power supply device 20 according to the embodiment includes a chargeable / dischargeable battery 22 such as a lithium ion secondary battery, and the power from the battery 22 is supplied to the drive device 12 such as a motor via the drive power line 24 when each relay is turned on and off. Or the battery 22 is charged by the power from the charger 14 connected via the charging power line 26, and each relay is configured with a power electronic control unit ( Hereinafter, the driving is controlled by a “power supply ECU”. The charger 14 can be connected to the external power source 16 via the charger side connector 15 and the external power source side connector 17.

  A driving smoothing capacitor C1 for smoothing the voltage of the driving power line 24 is attached to the driving power line 24 of the power supply device 20 of the embodiment. In addition, a driving positive side relay SMRB is attached to the positive side line of the driving power line 24, and a driving negative side relay SMRG is attached to the negative side line. In addition, a driving precharge circuit 25 in which a precharging resistor R and a driving precharging relay SMRP are connected in series so as to bypass the driving negative electrode side relay SMRG is connected to the negative electrode side line (in FIG. 1). , A broken line portion) is attached. The drive precharge circuit 25 charges the drive smoothing capacitor C1 in advance before turning on the drive positive relay SMRB and the drive negative relay SMRG when supplying power from the battery 22 to the drive device 12. It is a circuit for. The precharge (charging) of the driving smoothing capacitor C1 is performed by turning on the driving positive side relay SMRB and the driving precharging relay SMRP, the positive electrode of the battery 22, the driving positive side relay SMRB, the driving smoothing capacitor C1, This is done by forming a closed circuit comprising a driving precharge relay SMRP, a precharging resistor R, and the negative electrode of the battery 22.

  A charging smoothing capacitor C2 for smoothing the voltage of the charging power line 26 is attached to the charging power line 26 of the power supply device 20 of the embodiment. Further, a charging positive side relay CHRB is attached to the positive side line of the charging power line 26, and a charging negative side relay CHRG is attached to the negative side line. In addition, a charging precharge circuit 27 in which a precharging resistor R and a charging precharging relay CHRP are connected in series so as to bypass the charging negative electrode side relay CHRG is connected to the negative electrode side line (in FIG. 1). , A one-dot chain line portion) is attached. This charging precharge circuit 27 is charged in advance before turning on the charging positive side relay CHRB and the charging negative side relay CHRG when the battery 14 is charged with the power from the external power source 15 by the charger 14. This is a circuit for charging the smoothing capacitor C2. As shown in the figure, the precharge resistor R is shared by the drive precharge circuit 25 and the charge precharge circuit 27. Precharging (charging) of the charging smoothing capacitor C2 is performed by turning on the charging positive-side relay CHRB and the charging pre-charging relay CHRP, the positive electrode of the battery 22, the charging positive-side relay CHRB, the charging smoothing capacitor C2, This is done by forming a closed circuit comprising a charging precharge relay CHRP, a precharging resistor R, and the negative electrode of the battery 22.

  Although not shown, the power supply ECU 30 is configured as a microcomputer centered on a CPU. In addition to the CPU, a ROM that stores a processing program, a RAM that temporarily stores data, an input port, an output, and the like Provide ports. From the power supply ECU 30, a driving positive side relay SMRB, a driving negative side relay SMRG, a driving precharge relay SMRP, a charging positive side relay CHRB, a charging negative side relay CHRG, and a charging precharge are provided as necessary. A drive signal is output to the relay CHRP.

  Next, a relay connection process in the power supply device 20 of the embodiment configured as described above will be described. FIG. 2 is a flowchart showing an example of a drive device relay connection process (hereinafter referred to as “SMR connection process”) when connecting the battery 22 and the drive device 12, and FIG. 6 is a flowchart illustrating an example of a charger relay connection process (hereinafter referred to as “CHR connection process”) when connecting to the charger 14. Hereinafter, the SMR connection process and the CHR connection process will be described in this order, and then the relationship between the two processes will be described.

  When the SMR connection process is executed, first, a counter CT is input (step S100), and it is determined whether or not the counter CT is less than a predetermined value Cset (step S110). The counter CT reflects the temperature of the precharging resistor R and the estimated temperature, and is charged when the driving smoothing capacitor C1 is precharged by the SMR connection process of FIG. 2 or by the CHR connection process of FIG. When the smoothing capacitor C2 for precharging is precharged, it counts up and counts down as time elapses. That is, it is counted up by energizing the precharging resistor R and counted down by natural cooling by the outside air. The count-up amount due to energization of the precharging resistor R will be described later. The countdown amount by natural cooling by the outside air was determined in advance by experiments or the like. The predetermined value Cset is determined as a count value corresponding to the allowable maximum temperature in the normal use of the precharge resistor R or a temperature slightly lower than that. When the counter CT is equal to or greater than the predetermined value Cset, it is necessary to protect the precharging resistor R from overheating. Therefore, the precharge of the driving smoothing capacitor C1 and the battery 22 by the driving positive side relay SMRB and the driving negative side relay SMRG The connection with the drive device 12 is not performed, and the SMR connection process is terminated.

  When the counter CT is less than the predetermined value Cset, the driving positive side relay SMRB and the driving precharge relay SMRP are turned on to start the precharging of the driving smoothing capacitor C1 (step S120), and the counter CT is incremented by the count amount Csmr. (Step S130), wait for the driving smoothing capacitor C1 to be fully charged (step S140), turn off the driving precharge relay SMRP and turn on the driving negative side relay SMRG to drive the battery 22. The device 12 is connected (step S150). Here, the count-up amount Csmr is adjusted to correspond to an increase when the temperature of the precharge resistor R rises by precharging the driving smoothing capacitor C1. The completion of the charging of the driving smoothing capacitor C1 is determined when, for example, the voltage between the terminals of the battery 22 and the voltage between the terminals of the driving smoothing capacitor C1 are equal to each other, or is obtained in advance by an experiment or the like. It can be determined when the time required for completion of charging has elapsed.

  Subsequently, it is determined whether or not the counter CT is greater than or equal to a predetermined value Cset (step S160). When the counter CT is less than the predetermined value Cset, it is determined that the connection between the battery 22 and the driving device 12 has been completed normally. The SMR connection process is terminated.

  On the other hand, when the counter CT is equal to or larger than the predetermined value Cset, SMR holding control is started to hold the state where the driving positive side relay SMRB and the driving negative side relay SMRG are turned on (step S170), and the counter CT is set to the predetermined value. After waiting for a time T1 necessary for the count-up amount Csmr to be smaller than Cset (step S180), the SMR holding control is canceled (step S190), and the SMR connection process is terminated. Here, the purpose of executing the SMR holding control is to precharge the driving smoothing capacitor C1 by turning on the driving precharging relay SMRP until the counter CT becomes smaller than the predetermined value Cset by the count-up amount Csmr or more. It is prohibition and ensuring the driving of the driving device 12. If the precharge of the driving smoothing capacitor C1 by simply turning on the driving precharge relay SMRP when the counter CT is equal to or greater than the predetermined value Cset is prohibited, the driving positive electrode side relay SMRB is driven by the system stop instruction. When the negative electrode side relay SMRG is turned off and a system activation instruction is given immediately thereafter, the driving smoothing capacitor C1 cannot be precharged, and therefore the system cannot be activated. In the embodiment, even if a system stop instruction is issued by executing the SMR holding control, the driving positive-side relay SMRB and the driving negative-side relay SMRG are held in the ON state immediately after that. When the activation instruction is given, the system is immediately activated. Therefore, the execution of the SMR holding control also means prohibiting the precharge of the driving smoothing capacitor C1 by turning on the driving precharging relay SMRP.

  When the CHR connection process of FIG. 3 is executed, first, a counter CT is input (step S200), and it is determined whether or not the counter CT is less than a value obtained by subtracting a predetermined value α from a predetermined value Cset. (Step S210) When the counter CT is equal to or larger than the value obtained by subtracting the predetermined value α from the predetermined value Cset, it is necessary to protect the precharging resistor R from overheating. Connection between battery 22 and charger 14 by relay CHRB and charging negative side relay CHRG is not performed, and the CHR connection process is terminated. Here, the predetermined value α is a value equal to or larger than the count-up amount Csmr when the driving smoothing capacitor C1 is precharged. The reason for this will be described later.

  When the counter CT is less than a value obtained by subtracting the predetermined value α from the predetermined value Cset, the charging positive capacitor CHRB and the charging precharge relay CHRP are turned on to start precharging of the charging smoothing capacitor C2 (step S220). Then, the counter CT is incremented by the count-up amount Cchr (step S230), and after the charging smoothing capacitor C2 is completely charged (step S240), the charging precharge relay CHRP is turned off and the charging negative side relay CHRG is turned on to connect battery 22 and charger 14 (step S250). Here, the count-up amount Cchr is adjusted so as to correspond to an increase when the temperature of the precharging resistor R rises by precharging the charging smoothing capacitor C2, and in the embodiment, the driving smoothing capacitor By precharging C1, it is set to a value smaller than the count-up amount Csmr corresponding to the temperature rise of the precharging resistor R. In addition, the completion of charging of the charging smoothing capacitor C2 is determined when, for example, the voltage between the terminals of the battery 22 and the voltage between the terminals of the charging smoothing capacitor C2 coincide with each other, or are obtained in advance through experiments or the like. It can be determined when the time required for completion of charging has elapsed.

  Subsequently, it is determined whether or not the counter CT is equal to or larger than a value obtained by subtracting the predetermined value α from the predetermined value Cset (step S260). If the counter CT is less than a value obtained by subtracting the predetermined value α from the predetermined value Cset, the counter CT is normal. It is determined that the connection between the battery 22 and the charger 14 has been completed, and the CHR connection process is terminated. On the other hand, when the counter CT is equal to or larger than the value obtained by subtracting the predetermined value α from the predetermined value Cset, the CHR holding control for holding the charging positive relay CHRB and the charging negative relay CHRG on is started (step S270) Waiting for a time T2 required for the counter CT to become smaller than the value obtained by subtracting the predetermined value α from the predetermined value Cset by the count-up amount Cchr (step S280), the CHR holding control is canceled (step S290), The CHR connection process is terminated. Here, the purpose of executing the CHR holding control is to perform charging by turning on the charging precharge relay CHRP until the counter CT becomes smaller than the count-up amount Cchr by a value obtained by subtracting the predetermined value α from the predetermined value Cset. In other words, precharging of the smoothing capacitor C2 is prohibited and the connection of the charger 14 is secured. When the counter CT is equal to or larger than the value obtained by subtracting the predetermined value α from the predetermined value Cset, simply prohibiting the precharging of the charging smoothing capacitor C2 by turning on the charging precharge relay CHRP will cause a charge stop instruction. When the charging positive relay CHRB and the charging negative relay CHRG are turned off and a charging instruction is given immediately after that, the charging smoothing capacitor C2 cannot be precharged, so the charger 14 charges the battery 22. Cannot be performed. In the embodiment, even if an instruction to stop charging is made by executing the CHR holding control, the charging positive relay CHRB and the charging negative relay CHRG are kept on and charged immediately after that. When the instruction is given, the battery 14 can be immediately charged by the charger 14. Therefore, execution of the CHR holding control also means prohibiting the precharging of the charging smoothing capacitor C2 by turning on the charging precharging relay CHRP.

  Now, consider a case where a system activation instruction is given and the SMR connection process of FIG. 2 is executed when the CHR holding control is being executed by the CHR connection process of FIG. At this time, considering that the predetermined value α is equal to or larger than the count-up amount Csmr and the count-up amount Cchr is smaller than the count-up amount Csmr, the counter CT is larger than a value obtained by subtracting the predetermined value α from the predetermined value Cset. It becomes less than the predetermined value Cset. For this reason, in step S110 of FIG. 2, it is determined that the counter CT is less than the predetermined value Cset, the driving smoothing capacitor C1 is precharged, the driving positive side relay SMRB and the driving negative side relay SMRG are turned on, and the battery 22 is turned on. And the driving device 12 can be connected. As described above, the predetermined value α is set to a value equal to or larger than the count-up amount Csmr when the driving smoothing capacitor C1 is precharged so that the system can be activated even when the CHR holding control is executed. It is.

  According to the power supply device 20 of the embodiment described above, the counter CT that reflects the temperature of the precharging resistor R when the driving smoothing capacitor C1 is precharged when the battery 22 and the driving device 12 are connected. When the battery 22 and the charger 14 are connected by executing SMR holding control for holding the driving positive-side relay SMRB and the driving negative-side relay SMRG turned on when the voltage reaches a predetermined value Cset or more. When the counter CT reaches a value equal to or smaller than the predetermined value Cset by the predetermined value α during the precharging of the charging smoothing capacitor C2, the charging positive side relay CHRB and the charging negative side relay CHRG are turned on. By executing the CHR holding control that holds the state, the smoothing drive for driving is performed even when the CHR holding control is executed. It can be connected to the battery 22 and the driving device 12 performs a precharge Sa C2 and drive the positive pole side relay SMRB and driving anode side relay SMRG as on. As a result, when the CHR holding control is executed, the driving smoothing capacitor C2 cannot be precharged to prevent overheating of the precharging resistor R, so that the battery 22 and the driving device 12 are connected. Thus, the inconvenience that the system cannot be activated can be avoided.

  In the power supply device 20 according to the embodiment, the counter CT that reflects the temperature of the precharging resistor R is calculated from the predetermined value Cset when the charging smoothing capacitor C2 is precharged when the battery 22 and the charger 14 are connected. The CHR holding control for holding the charging positive relay CHRB and the charging negative relay CHRG turned on when the predetermined value α or more is reached is executed. When the counter CT reaches a predetermined value Cset or more during precharging of the charging smoothing capacitor C2 performed when the battery 14 is connected, the charging positive side relay CHRB and the charging negative side relay CHRG are turned on. The CHR holding control for holding the held state is executed and the driving positive side relay SMRB and the driving negative side relay SMRG are turned on. State may be executed the SMR holding control for holding the. The CHR connection process in this case is shown in FIG. The CHR connection process of FIG. 4 is changed from the process of steps S210 and S260 to the process of determining whether or not the counter CT is equal to or larger than a predetermined value Cset (steps S210B and S260B). In the meantime, processing for starting SMR holding control (steps S272 and S274) by turning on the driving positive side relay SMRB and the driving negative side relay SMRG is added (steps S272 and S274). The process is changed to the process of waiting for the time T1 required to become smaller than the count-up amount Csmr (step S280B), and the process of step S290 is changed to the process of releasing the SMR holding control and the CHR holding control (step S290B). 3 is the same as the CHR connection process in FIG. . That is, in the CHR connection process of FIG. 4, when the counter CT is less than the predetermined value Cset (step S210B), the charging positive capacitor CHRB and the charging precharge relay CHRP are turned on to precharge the charging smoothing capacitor C2. (Step S220), the counter CT is increased by the count-up amount Cchr (step S230), the charging smoothing capacitor C2 is waited for completion of charging (step S240), and the charging precharge relay CHRP is turned off. At the same time, the charging negative relay CHRG is turned on to connect the battery 22 and the charger 14 (step S250). Then, when the counter CT reaches a predetermined value Cset or more (step S260B), CHR holding control for holding the charging positive relay CHRB and the charging negative relay CHRG on is started (step S270). Then, the driving positive side relay SMRB and the driving negative side relay SMRG are turned on (step S272), the SMR holding control is started (step S274), and the counter CT becomes smaller than the predetermined value Cset by the count-up amount Csmr or more. After waiting for a necessary time T1 (step S280B), the SMR holding control and the CHR holding control are canceled (step S290B), and the CHR connection process is terminated. In this process, when the CHR holding control is executed, the driving positive side relay SMRB and the driving negative side relay SMRG are always turned on to execute the SMR holding control. The inconvenience that cannot be avoided can be avoided.

  In the power supply device 20 of the embodiment, a driving positive side relay SMRB, a driving negative side relay SMRG, a driving precharge relay SMRP, a charging positive side relay CHRB, a charging negative side relay CHRG, a charging precharge relay Although relays are used for all of the CHRP, it is only necessary to be able to connect and disconnect, so the invention is not limited to relays, and contactors and switches may be used. In this case, it is not necessary for all the relays to be contactors or switches, and some of the relays may be contactors or switches.

  In the power supply device 20 of the embodiment, the counter CT reflecting the temperature of the precharging resistor R is equal to or greater than a predetermined value Cset when the driving smoothing capacitor C1 is precharged when the battery 22 and the driving device 12 are connected. SMR holding control is executed to hold the driving positive-side relay SMRB and the driving negative-side relay SMRG turned on when the driving smoothing capacitor C1 is precharged. Since the energization of the resistor R may be prohibited, the SMR protection control may not be executed.

  In the power supply device 20 according to the embodiment, the counter CT that reflects the temperature of the precharging resistor R is calculated from the predetermined value Cset when the charging smoothing capacitor C2 is precharged when the battery 22 and the charger 14 are connected. The charging smoothing capacitor is configured to execute the CHR holding control for holding the charging positive-side relay CHRB and the charging negative-side relay CHRG turned on when the predetermined value α or more is reached. Since the energization of the precharging resistor R by the precharging of C2 may be prohibited, the CHR protection control may not be executed.

  In the power supply device 20 of the embodiment, the SMR protection control and the CHR protection control are executed using the counter CT reflecting the temperature of the precharge resistor R. However, the temperature sensor detects the temperature of the precharge resistor R. And the SMR protection control is executed when the temperature from the temperature sensor reaches a first threshold value which is set in advance as a maximum allowable temperature in normal use of the precharge resistor R or a temperature slightly lower than that. The CHR protection control may be executed when the temperature from the sensor reaches a second threshold value smaller than the first threshold value. Further, the temperature of the precharging resistor R is estimated from the current flowing through the precharging resistor R, and when the estimated temperature reaches the first threshold value or more, SMR protection control is executed, and the temperature from the temperature sensor is The CHR protection control may be executed when a second threshold value smaller than the first threshold value is reached.

  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 battery 22 corresponds to a “storage battery”, the drive device 12 corresponds to a “power consuming device”, the drive power line 24 corresponds to a “first power line”, and the drive smoothing capacitor C1 includes “ Corresponding to the “first smoothing capacitor”, the driving positive side relay SMRB corresponds to the “first positive side relay”, the driving negative side relay SMRG corresponds to the “first negative side relay”, and the precharging resistance R Corresponds to the “precharge resistor”, the drive precharge relay SMRP corresponds to the “first precharge relay”, the drive precharge circuit 25 corresponds to the “first precharge circuit”, and the power supply The device 20 corresponds to a “power supply device”, the charging power line 26 corresponds to a “second power line”, the charging smoothing capacitor C2 corresponds to a “second smoothing capacitor”, and the charging positive-side relay CH B corresponds to the “second positive-side relay”, the charging negative-side relay CHRG corresponds to the “second negative-side relay”, and the charging pre-charge relay CHRP corresponds to the “second pre-charge relay”. The charging precharge circuit 27 corresponds to the “second precharge circuit”, and the power supply ECU 30 that executes the SMR connection process of FIG. 2 and the CHR connection process of FIG. 3 corresponds to the “precharge control means”.

  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.

  12 drive device, 14 charger, 15 charger side connector, 16 external power supply, 17 external power supply side connector, 20 power supply device, 22 battery, 24 drive power line, 25 drive precharge circuit, 26 charge power line, 27 charging precharge circuit, 30 power supply electronic unit (power supply ECU), C1, driving smoothing capacitor, C2 charging smoothing capacitor, R precharging resistor, CHRB charging positive side relay, CHRG charging negative side relay, CHRP Precharge Relay for Charging, SMRB, Driving Positive Side Relay, SMRG Driving Negative Side Relay, SMRP Driving Precharge Relay.

Claims (3)

A first smoothing capacitor attached to a storage battery, a first power line connecting the storage battery and the power consuming device, and a positive electrode side and a negative electrode side between the storage battery and the first smoothing capacitor of the first power line A precharge resistor and a first precharge relay connected in series so as to bypass one of the first positive electrode side relay and the first negative electrode side relay, and the first positive electrode side relay and the negative electrode side relay. A first precharge circuit connected to the power supply device,
A second smoothing capacitor attached to a second power line connected to the storage battery to charge the storage battery using power from an external power source;
A second positive electrode side relay and a second negative electrode side relay attached to the positive electrode side and the negative electrode side between the storage battery and the second smoothing capacitor of the second power line;
A second precharge circuit comprising a second precharge relay connected in series with the precharge resistor and in parallel with the first precharge relay; and the precharge resistor;
When the temperature or estimated temperature of the precharging resistor is equal to or higher than a first threshold, precharging of the first smoothing capacitor by turning on the first precharging relay is prohibited, and the temperature or estimating of the precharging resistor is performed. Precharge control means for prohibiting precharging of the second smoothing capacitor by turning on the second precharge relay when the temperature is equal to or higher than a second threshold value that is lower than the first threshold value;
A power supply device comprising: The power supply device according to claim 1,
The second threshold value is set to be equal to or less than a value obtained by subtracting a value corresponding to the temperature increase of the precharging resistor when the first smoothing capacitor is precharged from the first threshold value.
Power supply. The power supply device according to claim 1 or 2,
The precharge control means sets both the first positive side relay and the first negative side relay to be on when prohibiting precharging of the first smoothing capacitor, and prohibits precharging of the second smoothing capacitor. When the second positive side relay and the second negative side relay are both turned on.
Power supply.

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