JP2010088227A - Power supply device system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power storage device system in which an overvoltage in a power storage device can be detected more reliably. <P>SOLUTION: The power supply device system 10 includes: the power storage device 12 connected to a load circuit having capacitors; an instruction output means which receives a system start signal from the outside, outputs a standby instruction, then outputs a standby release instruction with an elapse of a predetermined period of time; and relay circuit parts which are provided between the power storage device 12 and the load circuit to bring the power storage device 12 and the load circuit into a cut-off state when the standby instruction is received from the instruction output means, or to bring the power storage device 12 and the load circuit into a connection state when the standby release instruction is received from the instruction output means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply system, and more particularly, to a power supply system having a relay.

  In a power supply system including a high-voltage power storage device, it is necessary to monitor the power storage state of the power storage device, and for example, it is necessary to monitor whether or not the power storage device is in an overvoltage state.

  In Patent Document 1, in an overvoltage detection device that detects an overvoltage of each cell of an assembled battery in which a plurality of cells of a secondary battery are connected in series or in series and parallel, the terminal voltage of the cell corresponds to an end-of-charge voltage. A reference voltage generating means for generating a reference voltage, a voltage dividing means for dividing the terminal voltage of the cell by a predetermined voltage dividing ratio, a comparing means for comparing the output of the reference voltage means and the output of the voltage dividing means, A first switching unit that is connected so as to turn on and off the cell and the reference voltage generating unit in response to a control signal and insulates the control signal from an input / output; It is disclosed. Patent Document 2 discloses a control device for an electric vehicle as a technique related to the present invention.

Japanese Patent Laid-Open No. 9-159701 JP 2003-180003 A

  In the power supply device system, a relay is disposed between the power storage device and a load circuit including a capacitor, and the power storage device and the load circuit may be connected or disconnected by controlling the relay. it can. When the power supply device system is activated and the power storage device and the load circuit are connected, the capacitor is precharged. According to the configuration of Patent Document 1, it is possible to detect the overvoltage of the power storage device. However, if the overvoltage is detected during precharge after startup, the battery voltage of the power storage device decreases as a result of the charge being taken out by the precharge. The overvoltage condition may not be detected accurately. Patent Document 2 describes the remaining capacity detection means for detecting the remaining capacity of the power storage device, but does not specifically disclose the detection of an overvoltage state.

  The objective of this invention is providing the power supply device system which can detect the overvoltage of an electrical storage apparatus more correctly.

  A power supply device system according to the present invention outputs a standby command upon receiving a system activation signal from the outside and a power storage device connected to a load circuit having a capacitor, and then outputs a standby release command after a predetermined period of time has elapsed. Provided between the command output means and the power storage device and the load circuit. When receiving the standby command from the command output means, the power storage device and the load circuit are disconnected, and when receiving the standby release command from the command output means, the power is stored. A relay circuit unit that connects the device and the load circuit.

  Further, in the power supply system according to the present invention, when the relay circuit unit determines that the determination unit is abnormal, when the determination unit determines that the determination unit is normal while keeping the power storage device and the load circuit disconnected. It is preferable to connect the power storage device and the load circuit.

  Further, in the power supply system according to the present invention, the relay circuit unit is connected between the one side terminal of the power storage device and the one side terminal of the load circuit, and includes a first relay circuit unit configured using a relay; A second relay circuit unit connected between the other terminal of the power storage device and the other terminal of the load circuit, and configured using a relay and a resistance element connected in series to the relay; and a second relay circuit unit And a third relay circuit unit that is connected in parallel and configured using a relay.

  The power supply system according to the present invention further includes a determination unit that determines whether the state of the power storage device is normal or abnormal, and the command output unit outputs a standby release command even when the determination by the determination unit is completed It is preferable to do.

  In the power supply system according to the present invention, the relay circuit unit turns on the relay of the first relay circuit unit after receiving the standby release command from the command output means, and then turns on the relay of the second relay circuit unit. After that, it is preferable to turn on the relay of the third relay circuit unit and then turn off the relay of the second relay circuit unit.

  A control device according to the present invention includes a first relay circuit unit configured using a relay connected between one side terminal of a power storage device and one side terminal of a load circuit, and the other side terminal of the power storage device and a load circuit. A second relay circuit section configured using a relay and a resistance element connected in series to the relay, and a relay connected in parallel to the second relay circuit section. A control device for controlling a power supply device having a third relay circuit unit, comprising: a determination means for determining whether the state of the power storage device is normal or abnormal; The relays of the first relay circuit unit, the second relay circuit unit, and the third relay circuit unit are controlled so that the load circuit is in a disconnected state, and then after a predetermined period of time has elapsed, or when the determination means is normal Received the judgment result Turn on the relay of the first relay circuit unit, then turn on the relay of the second relay circuit unit, then turn on the relay of the third relay circuit unit, and then turn off the relay of the second relay circuit unit And controlling relays of the first relay circuit unit, the second relay circuit unit, and the third relay circuit unit.

  According to the power supply system configured as described above, when the standby command is received, the power storage device and the load circuit are disconnected, and after receiving the standby release command, the power storage device and the load circuit are connected. Thus, the capacitor is not precharged from the power storage device until a standby release command is received, and the overvoltage of the power storage device can be detected more accurately by detecting the overvoltage during the standby command.

  According to the power supply device system having the relay circuit unit that performs switching control of the disconnected state or the connected state based on the determination result by the determination unit having the above configuration, when the state of the power storage device is abnormal, the power storage device and the load circuit are connected. Leave disconnected. Thereby, since the power storage device is not charged from the load circuit side, it is possible to prevent the power storage device from being overcharged.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. Further, in this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating understanding of the present invention, and can be appropriately changed according to the use, purpose, specification, and the like.

  FIG. 1 is a diagram showing a power supply system 10 according to an embodiment of the present invention. The power supply device system 10 includes a power supply device 100 and a control unit 110. First motor generator 60 and second motor generator 70 are driven by power supply device 100. Hereinafter, the power supply apparatus 100 will be described, and the first motor generator 60, the second motor generator 70, and the control unit 110 will be described in this order.

  The power supply device 100 includes a power storage device 12, a current sensor 14, a first relay circuit unit 16, a second relay circuit unit 20, a third relay circuit unit 23, capacitors 28 and 40, a step-up / down converter 39, The first inverter circuit 200 and the second inverter circuit 300 are included.

The power storage device 12 is a battery for supplying power to the first motor generator 60 and the second motor generator 70. The power storage device 12 is a DC power source that can be charged and discharged, and is formed of a secondary battery such as nickel hydride or lithium ion. The current sensor 14 is a current sensor that is connected in series to one terminal of the power storage device 12 and measures a current value flowing to the power storage device 12. Note that although the current value flowing to the power storage device 12 is described as being measured using the current sensor 14, the total power value for the circuit driven by the power storage device 12 of the power supply device system 10 is expressed at both ends of the capacitor 28. You may obtain | require and estimate from the value divided by the voltage _VL .

  The first relay circuit unit 16 is a relay connected in series to the current sensor 14 and controls connection or disconnection according to a control command from the control unit 110. The second relay circuit unit 20 is configured by connecting a resistance element 22 and a relay 18 that controls connection or disconnection in accordance with a control command from the control unit 110 in series. Second relay circuit unit 20 is connected in series to the other terminal of power storage device 12. The third relay circuit unit 23 is a relay connected in parallel to the second relay circuit unit 20, and controls connection or disconnection according to a control command from the control unit 110.

  The capacitor 28 is connected between the power supply line 24 and the ground line 26 and is a smoothing capacitor that smoothes voltage fluctuations between the power supply line 24 and the ground line 26.

  The step-up / down converter 39 includes a coil 30 connected in series with the power supply line 24, a transistor 32 connected between the coil 30 and the power supply line 50, and a transistor connected between the coil 30 and the ground line 52. 34, a diode 36 connected in parallel to the transistor 32, and a diode 38 connected in parallel to the transistor 34.

  Buck-boost converter 39 boosts the DC voltage received from power storage device 12 using coil 30 based on a control signal from control unit 110, and supplies the boosted boosted voltage to power supply line 50. More specifically, the step-up / step-down converter 39 accumulates current flowing in accordance with the switching operation of the transistor 34 as electromagnetic energy in the coil 30 based on a control signal from the control unit 110. Thereby, the DC voltage from power storage device 12 is boosted. The step-up / step-down converter 39 outputs the boosted boosted voltage to the power supply line 50 via the diode 36 in synchronization with the timing when the transistor 34 is turned off.

  Further, the step-up / step-down converter 39 steps down the DC voltage received from the first inverter circuit 200 or the second inverter circuit 300 based on the control signal from the control unit 110 and charges the power storage device 12.

  The capacitor 40 is connected between the power supply line 50 and the ground line 52 and is a smoothing capacitor that smoothes voltage fluctuations between the power supply line 50 and the ground line 52.

  As a component of the first inverter circuit 200, a transistor 210 and a transistor 220 are connected in series between the power supply line 50 and the ground line 52. In addition, a diode 212 is connected in parallel to the transistor 210, and a diode 222 is connected in parallel to the transistor 220.

  As another component of the first inverter circuit 200, a transistor 230 and a transistor 240 are connected in series between the power supply line 50 and the ground line 52. A diode 232 is connected in parallel to the transistor 230, and a diode 242 is connected in parallel to the transistor 240.

  As yet another component of the first inverter circuit 200, a transistor 250 and a transistor 260 are connected in series between the power supply line 50 and the ground line 52. A diode 252 is connected in parallel to the transistor 250, and a diode 262 is connected in parallel to the transistor 260. Note that, as shown in FIG. 1, the second inverter circuit 300 is also composed of the same elements as the first inverter circuit, and thus detailed description thereof is omitted.

  The first inverter circuit 200 and the second inverter circuit 300 convert the DC voltage of the capacitor 40 into an AC voltage during powering and supply the AC voltage to the first motor generator 60 or the second motor generator 70, whereby the first motor generator 60 or Second motor generator 70 is driven to rotate. In addition, the first inverter circuit 200 and the second inverter circuit 300 convert the AC voltage generated by the first motor generator 60 or the second motor generator 70 into a DC voltage during regeneration and supply it to the power storage device 12. The power storage device 12 is charged.

  First motor generator 60 includes a U-phase coil 62, a V-phase coil 64, and a W-phase coil 66. U-phase coil 62 is a coil connected between a connection point between transistor 210 and transistor 220 and neutral point 68. V-phase coil 64 is a coil connected between a connection point between transistor 230 and transistor 240 and neutral point 68. W-phase coil 66 is a coil connected between a connection point between transistor 250 and transistor 260 and neutral point 68. As shown in FIG. 1, the second motor generator 70 is configured by the same elements as the first motor generator 60, and thus detailed description thereof is omitted.

The control unit 110 is a control device that controls the power supply device 100 in the power supply device system 10. The control unit 110 controls each transistor included in the step-up / down converter 39, the first inverter circuit 200, and the second inverter circuit 300 to function each circuit. Control unit 110 also has a function of determining whether the state of the voltage at both ends of power storage device 12 is a normal voltage or an abnormal voltage (overvoltage) based on the voltage value for each cell constituting power storage device 12. Specifically, whether the voltage is a normal voltage or an abnormal voltage is determined as a normal voltage if the voltage is equal to or lower than a predetermined threshold, and is determined as an abnormal voltage if the voltage is equal to or higher than the threshold. Control unit 110 may determine the state of the voltage across power storage device 12 based on the value of V _L.

  Further, the control unit 110 controls the first relay circuit unit 16, the second relay circuit unit 20, and the third relay circuit unit 23. Here, the state in which the power storage device 12 is connected to the load circuit connected to the power supply line 24 and the ground line 26 is referred to as SMR connection, and the state in which the power storage device 12 is disconnected from the load circuit is referred to as SMR release. Call. SMR connection means that the relay of the first relay circuit unit 16 is in a connected state and at least one of the relay 18 of the second relay circuit unit 20 and the relay of the third relay circuit unit 23 is in a connected state. Say. Moreover, SMR opening means that the relay of the 1st relay circuit part 16 is a disconnection state, and the relay 18 of the 2nd relay circuit part 20 and the relay of the 3rd relay circuit part 23 are a disconnection state. In the SMR release, when the relay of the first relay circuit unit 16 is in a disconnected state, the relay 18 of the second relay circuit unit 20 and the relay of the third relay circuit unit 23 may not be in a disconnected state. Even if the relay of the 1st relay circuit part 16 is not a disconnection state, the relay 18 of the 2nd relay circuit part 20 and the relay of the 3rd relay circuit part 23 should just be a disconnection state. Here, the load circuit is a combination of the capacitors 28 and 40, the buck-boost converter 39, the first inverter circuit 200, and the second inverter circuit 300. Hereinafter, each signal such as the activation signal in the power supply system 10 will be described, and the function of the control unit 110 will be described more specifically.

  FIG. 2 is a timing chart of each signal such as a system activation signal in the power supply system 10. The IG signal is a signal for starting up the power supply system 10, and is a signal that changes from Low to High when the ignition is turned on by an operation of a user or the like. The rdywait signal is a signal for issuing a standby command (High) for waiting for SMR connection and a standby release command (Low).

  The ST signal is a signal for instructing preparation for SMR connection, and specifically, a signal for instructing start when the signal changes from Low to High. The SMRB command signal is a signal for switching the first relay circuit unit 16 to the connected state or the disconnected state. When the signal is low, the first relay circuit unit 16 is disconnected. When the signal is high, the first relay circuit unit 16 is disconnected. 16 is connected. The SMRP command signal is a signal for switching the second relay circuit unit 20 to a connected state or a disconnected state. When the signal is Low, the second relay circuit unit 20 is disconnected. When the signal is High, the second relay circuit unit 20 is disconnected. 20 is connected. The SMRG command signal is a signal for switching the third relay circuit unit 23 to a connected state or a disconnected state. When the signal is Low, the third relay circuit unit 23 is disconnected. When the signal is High, the third relay circuit unit 23 is disconnected. 23 is connected.

  The sxsmr signal is a signal that changes from Low to High when the SMR connection is completed. Specifically, the relay of the first relay circuit unit 16 is in a connected state, and then the relay of the second relay circuit unit 20 is connected. 18 is a signal that changes from Low to High when the relay of the third relay circuit unit 23 is connected and then the relay 18 of the second relay circuit unit 20 is disconnected. The sxrdy signal is a signal that changes from Low to High when the SMR connection is completed and the power supply system 10 changes to an operable state.

  The control unit 110 changes the rdywait signal from Low to High when the IG signal, which is an external system activation signal, changes from Low to High. Control unit 110 then times out after a predetermined period of time, or when the determination of whether the voltage at both ends of power storage device 12 is a normal voltage or an abnormal voltage (overvoltage) is completed. The rdywait signal is changed from High to Low. Here, the predetermined period is a sufficiently long time necessary for the control unit 110 to determine whether the state of the voltage across the power storage device 12 is a normal voltage or an abnormal voltage.

  The control unit 110 performs control so that the relay of the first relay circuit unit 16, the relay 18 of the second relay circuit unit 20, and the relay of the third relay circuit unit 23 are disconnected in the initial state. The control unit 110 prepares for SMR connection when the ST signal from the outside changes from Low to High. Specifically, the control unit 110 changes the SMRB command signal from Low to High when the rdywait signal changes from the standby command (High) to the release command (Low) for releasing the standby. Then, after a certain time has elapsed, the SMRP command signal is changed from Low to High. Further, after the SMRG command signal is changed from Low to High after a certain time has elapsed, the SMRP command signal is changed from High to Low. Thereafter, the sxsmr signal is changed from Low to High, and the sxrdy signal is changed from Low to High.

  Next, the operation of the power supply system 10 having the above configuration will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the power supply system 10. The control unit 110 determines whether or not an IG signal that is a system activation signal of the power supply system 10 from a user or the like outside is High (ON) (S2). If it is determined that the IG signal is Low (OFF), the process proceeds to return processing.

  If it is determined that the IG signal is High (ON), it is determined whether or not the sxsmr signal, which is a signal indicating whether or not the SMR connection is completed, is Low (OFF) (S4). When it is determined that the sxsmr signal is High (ON), the process proceeds to return processing.

  If it is determined that the sxsmr signal is Low (OFF), it is determined whether or not the ST signal, which is the SMR connection start signal, is High (ON) (S6). If it is determined that the ST signal is Low (OFF), the process proceeds to return processing.

  If it is determined that the ST signal is High (ON), it is determined whether or not the rdywait signal that is a standby command for waiting for SMR connection or a standby release command for canceling the standby is High (ON). (S8). If it is determined that the rdywait signal is High (ON), the process proceeds to return processing.

  When it is determined that the rdywait signal is Low (OFF), it is determined whether the rdywait signal has changed from High (ON) to Low (OFF) due to timeout (S10). If it is determined that the rdywait signal has changed to Low (OFF) due to timeout, the process proceeds to S14.

  If it is determined that the rdywait signal has changed to Low (OFF) regardless of timeout, it is determined whether the determination result of the voltage across the power storage device 12 is a normal voltage (S12). If it is determined that the determination result is abnormal because the voltage is equal to or higher than a predetermined threshold, the process proceeds to return processing.

  If it is determined that the determination result is a voltage equal to or lower than a predetermined threshold value and normal, the process proceeds to S14. In S14, SMR connection is started, and first, the relay of the first relay circuit unit 16 is brought into a connected state. Thereafter, the relay 18 of the second relay circuit unit 20 is connected. Thereafter, the relay of the third relay circuit unit 23 is connected, and the relay 18 of the second relay circuit unit 20 is disconnected.

  After the process of S14 is complete | finished, it progresses to a return process. Thus, according to the power supply apparatus system 10, even when the ignition is turned on by an operation of the user or the like, the SMR connection is not started for a predetermined period. Thus, if it is determined whether the voltage across power storage device 12 is a normal voltage or an abnormal voltage within a predetermined period, an accurate overvoltage can be detected without being affected by the precharge of power supply system 10.

  Further, when the both-end voltage of the power storage device 12 is an abnormal voltage (overvoltage), the power storage device and the load circuit are kept disconnected without being connected to the SMR, so that the power storage device is charged from the load circuit side. Therefore, it is possible to prevent the power storage device 12 from being overcharged.

It is a figure which shows the power supply device system of one Embodiment of this invention. It is a timing chart of each signal, such as a starting signal, in the power unit system of one embodiment of the present invention. It is a flowchart which shows operation | movement of the power supply device system of one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Power supply system, 12 Power storage device, 14 Current sensor, 16 1st relay circuit part, 18 Relay, 20 2nd relay circuit part, 22 Resistance element, 23 3rd relay circuit part, 24 Power supply line, 26 Ground line, 28 , 40 capacitor, 30 coil, 32, 34, 210, 220, 230, 240, 250, 260 transistor, 36, 38, 212, 222, 232, 242, 252, 262 diode, 39 buck-boost converter, 50 power supply line, 52 ground line, 60 first motor generator, 62 U phase coil, 64 V phase coil, 66 W phase coil, 68 neutral point, 70 second motor generator, 100 power supply device, 110 control unit, 200 first inverter circuit, 300 Second inverter circuit.

Claims (6)

A power storage device connected to a load circuit having a capacitor;
A command output means for receiving a system start signal from the outside and outputting a standby command, and then outputting a standby release command after a predetermined period of time;
Provided between the power storage device and the load circuit, when receiving a standby command from the command output means, the power storage device and the load circuit are disconnected, and when receiving a standby release command from the command output means, the power storage device and the load circuit A relay circuit for connecting the
A power supply system comprising: The power supply system according to claim 1,
The relay circuit section
The power storage device and the load circuit remain in a disconnected state when it is determined that the determination means is abnormal, and the power storage device and the load circuit are connected when the determination means is determined to be normal. Power supply system. In the power supply system according to claim 1 or 2,
The relay circuit section
A first relay circuit unit connected between one side terminal of the power storage device and one side terminal of the load circuit and configured using a relay;
A second relay circuit unit connected between the other terminal of the power storage device and the other terminal of the load circuit, and configured using a relay and a resistance element connected in series to the relay;
A third relay circuit unit connected in parallel to the second relay circuit unit and configured using a relay;
A power supply system comprising: In the power supply system according to any one of claims 1 to 3,
A determination means for determining whether the state of the power storage device is normal or abnormal,
The command output means is
A power supply system that outputs a standby release command even when the determination by the determination means is completed. The power supply system according to claim 4, wherein
The relay circuit section
After receiving the standby release command from the command output means, turn on the relay of the first relay circuit unit, then turn on the relay of the second relay circuit unit, and then turn on the relay of the third relay circuit unit, A power supply system characterized by turning off the relay of the second relay circuit section. A first relay circuit unit configured using a relay connected between one side terminal of the power storage device and one side terminal of the load circuit, and between the other side terminal of the power storage device and the other side terminal of the load circuit A second relay circuit unit configured using a connected relay and a resistance element connected in series to the relay; a third relay circuit unit configured using a relay connected in parallel to the second relay circuit unit; A control device for controlling a power supply device comprising:
A determination means for determining whether the state of the power storage device is normal or abnormal,
The relay of the 1st relay circuit part, the 2nd relay circuit part, and the 3rd relay circuit part is controlled so that a power storage device and a load circuit will be in a disconnected state in response to a system activation signal from the outside, and then a predetermined period of time has passed. The relay of the first relay circuit unit is turned on after the determination result is normal or from the determination means, and then the relay of the second relay circuit unit is turned on, and then the relay of the third relay circuit unit A control device that controls the relays of the first relay circuit unit, the second relay circuit unit, and the third relay circuit unit to turn on the relay and then turn off the relay of the second relay circuit unit.

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