JP6528129B2 - Backup power supply device and vehicle using backup power supply device - Google Patents

Description

  The present invention relates to a backup power supply used for various vehicle electronic devices.

  Hereinafter, a conventional backup power supply device will be described with reference to the drawings. FIG. 5 is a circuit block diagram showing the configuration of a conventional backup power supply 1. The backup power supply 1, the main battery 2, the load 3 and the controller 5 are mounted on a vehicle 4. As shown in FIG.

  The backup power supply 1 is provided with an auxiliary battery 6 and a switching unit 7. The auxiliary battery 5 is a secondary battery like the main battery 2. When the vehicle 4 is activated, the load unit 3 is driven by supplying a predetermined voltage from the main battery 2 to the load unit 3 normally.

  The control unit 5 detects the output voltage of the main battery 2. When the output voltage falls below a predetermined value, the control unit 5 switches the switching unit 7 from the open state to the connection state. Thereby, when the output voltage of the main battery 2 is lowered, the load unit 3 is activated by the power of the auxiliary battery 6.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP, 2013-28295, A

  However, in the conventional backup power supply device 1, the auxiliary battery 6 is a secondary battery like the main battery 2, and a lead storage battery or a lithium ion battery is mainly used. Therefore, although the auxiliary battery 6 has a small capacity and a small weight in comparison with the main battery 2, the auxiliary battery 6 has a large weight as an individual part. For this reason, the auxiliary battery 6 bears a large weight on the vehicle 4. As a result, the fuel consumption of the vehicle 4 is reduced.

  Therefore, the present invention aims to reduce the weight of the backup power supply and thereby reduce the weight of the vehicle and to improve the fuel consumption of the vehicle.

  And in order to achieve this object, according to the present invention, a power supply input unit, an output unit, a capacitor unit, a charging circuit unit provided in a charge path from the power supply input unit to the capacitor unit, and the capacitor unit And a booster circuit unit provided in an output path to the output unit, and a collision prediction signal input unit, wherein the capacitor unit is charged in advance to a charging voltage by the charging circuit, and the voltage of the power supply input unit is a threshold When it is lower than this, a boosted voltage boosted from the charging voltage in the booster circuit unit is outputted from the output unit in response to the collision prediction signal input unit receiving a signal. It is

  According to the present invention, when the output voltage of the main battery is decreasing, if a sufficient voltage is required for emergency response, a backup power source having a capacitor with a small weight and an electric circuit is used. Therefore, an auxiliary battery using a heavy secondary battery is not necessary. As a result, the backup power supply and the vehicle can be reduced in weight, and the fuel consumption of the vehicle can be improved.

  Further, particularly in the backup power supply device, a capacitor is used as a storage element, so that a large amount of power can easily be concentratedly supplied to the load in a short time. Therefore, the backup power supply apparatus can supply power to various electric components as a power supply for emergency response such as a collision avoidance operation.

A circuit block diagram showing a configuration of a backup power supply device according to an embodiment of the present invention A circuit block diagram showing a configuration of another backup power supply device according to an embodiment of the present invention A circuit block diagram showing a configuration of a vehicle using a backup power supply device according to an embodiment of the present invention A circuit block diagram showing a configuration of a vehicle using another backup power supply device according to an embodiment of the present invention Block diagram of a vehicle using a conventional backup power supply

  Hereinafter, embodiments of the present invention will be described using the drawings.

Embodiment
FIG. 1 is a circuit block diagram showing a configuration of backup power supply 8 in the embodiment of the present invention.

  The backup power supply device 8 includes a power supply input unit 9, an output unit 10, a capacitor unit 11, a charging circuit unit 12, a booster circuit unit 13, and a collision prediction signal input unit 14. The charging circuit unit 12 is provided in a charging path from the power supply input unit 9 to the capacitor unit 11. The booster circuit unit 13 is provided in an output path from the capacitor unit 11 to the output unit 10.

  Here, the capacitor unit 11 is charged to a charging voltage in advance by the charging circuit unit 12 using the power supplied from the power supply input unit 9. Then, when the voltage of the power supply input unit 9 is lower than the threshold, a boosted voltage is output from the output unit 10 in response to the collision prediction signal input unit 14 receiving the signal. The boosted voltage is a voltage obtained by boosting the charge voltage stored in the capacitor unit 11 by the booster circuit unit 13.

  With the above configuration and operation, when the voltage of the power supply input unit 9 is decreasing, when a sufficient voltage is required for emergency response, the capacitor unit 11 with a small weight and the charging circuit unit 12 are mainly used. And an electric circuit composed of the booster circuit unit 13 is used for power supply. Therefore, an auxiliary battery with a heavy secondary battery is not required. As a result, the backup power supply 8 is reduced in weight, and the fuel consumption of the vehicle equipped with the backup power supply 8 can be improved.

  In particular, since a capacitor is used as a storage element in the backup power supply 8, it becomes easy for the backup power supply 8 to concentrate and output large power in a short time. Therefore, the backup power supply 8 can supply electric power at a necessary and stable voltage to various electrical components as a power supply for emergency response such as a collision avoidance operation.

  The configuration and operation of the backup power supply 8 will be described in detail below. FIG. 2 is a circuit block diagram showing the configuration of another backup power supply 8 according to another embodiment of the present invention. Here, a control unit 21 is further provided to the backup power supply 8 shown in FIG. The control unit 21 is connected to the collision prediction signal input unit 14, the power supply input unit 9, the charging circuit unit 12, the booster circuit unit 13, the switch unit 23, and the operation signal input unit 24.

  The control unit 21 activates the charging circuit unit 12 at the timing when the backup power supply 8 is activated. Then, the charging circuit unit 12 charges the capacitor unit 11 to the charging voltage using the power supplied from the power supply input unit 9. Here, the timing at which the backup power supply 8 is activated may be timing at which a voltage is applied to the power input unit 9. Also, it may be after the timing when the voltage is applied to the power supply input unit 9.

  The control unit 21 detects the voltage of the power supply input unit 9 constantly or intermittently at predetermined timing and intermittently. Then, when the control unit 21 detects that the voltage of the power supply input unit 9 is lower than the threshold value, the backup power supply device 8 is in the standby state in the emergency operation. When the control unit 21 receives a collision prediction signal from the outside of the backup power supply device 8 via the collision prediction signal input unit 14 while the backup power supply device 8 is in the standby state, the control unit 21 outputs a predetermined boosted voltage from the output unit 10 Instruct them to On the other hand, the normal operation is when the control unit 21 detects that the voltage of the power supply input unit 9 is equal to or higher than the threshold.

  The predetermined boosted voltage in the above is generated in the following first procedure or second procedure and output from the output unit 10.

  In the first procedure, in response to the control unit 21 receiving a collision prediction signal via the collision prediction signal input unit 14 while the backup power supply 8 is in the standby state in the emergency operation, an instruction from the control unit 21 is firstly issued. As a result, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage. After that, in response to the control unit 21 receiving the operation signal from the outside of the backup power supply device 8 via the operation signal input unit 24, the switch unit 23 which has been opened by the instruction from the control unit 21 is closed.

  Thereby, even if the voltage of the power supply input unit 9 is lowered or unstable, the charge stored in the capacitor unit 11 is used, and the voltage boosted by the booster circuit unit 13 is stabilized, And it outputs from the output part 10 by a correct predetermined value. Therefore, backup power supply 8 outputs the boosted voltage only in accordance with the period required by the operation signal. As a result, the limited power stored in the capacitor unit 11 can be repeatedly used.

  Here, the collision prediction signal input unit 14 and the operation signal input unit 24 are separately provided, but may be integrated into one or the other. Then, the control unit 21 may obtain a collision prediction signal from either one, and may generate an operation signal after a predetermined time with respect to the collision prediction signal. Alternatively, the collision prediction signal and the operation signal may be transmitted simultaneously. Alternatively, the collision prediction signal and the operation signal may be configured by different electric signals, and the control unit 21 may determine which of the received signals is.

  The switch unit 23 may be opened again when a predetermined connection time elapses after the switch unit 23 is closed in response to the collision prediction signal being sent. Generally, the backup power supply 8 operates only for a short period of time. Therefore, the time when the switch unit 23 is closed by opening the switch unit 23 again is limited. As a result, the charge stored in the capacitor unit 11 is left to return to the standby state, and the backup power supply 8 may be prepared for further operation.

  In the second procedure, when backup power supply device 8 enters the standby state in the emergency operation, booster circuit unit 13 converts the voltage stored in capacitor unit 11 into a predetermined boosted voltage according to an instruction from control unit 21. Boost. Thereafter, in response to the control unit 21 receiving the collision prediction signal via the collision prediction signal input unit 14, the switch unit 23 which has been opened up to that point is closed by an instruction from the control unit 21.

  Thereby, even if the voltage of the power supply input unit 9 is lowered or unstable, the charge stored in the capacitor unit 11 is used, and the voltage boosted by the booster circuit unit 13 is stabilized, And it outputs from the output part 10 by a correct predetermined value. Here, since the backup power supply 8 generates the boosted voltage in the standby state, the backup power supply 8 immediately outputs a stable voltage in response to the reception of the collision prediction signal. As a result, the backup power supply 8 can drive the load (not shown) connected to the output unit 10 quickly and accurately.

  Here, even if the switch unit 23 is closed immediately and the voltage is output in response to the reception of the collision prediction signal, the backup power supply device 8 is opened after the reception of the collision prediction signal and the elapse of a predetermined period. The switch unit 23 may be closed. In addition, when the control unit 21 receives the operation signal in the middle of the above-mentioned predetermined period and both the collision prediction signal and the operation signal are received, it is possible to wait at that time without waiting for the above-mentioned predetermined period to elapse. The switch part 23 which was open until then may be closed.

  Also in the second procedure, the collision prediction signal input unit 14 and the operation signal input unit 24 may be provided as a single input unit or may be provided separately. Here, the control unit 21 may obtain a collision prediction signal from any one of the collision prediction signal input unit 14 and the operation signal input unit 24 and may generate an operation signal after a predetermined time with respect to the collision prediction signal. Then, the switch unit 23 may be closed in response to the generation of the operation signal. Alternatively, the collision prediction signal and the operation signal may be transmitted simultaneously. Alternatively, the collision prediction signal and the operation signal may be configured by different electric signals, and the control unit 21 may determine which of the received signals is.

  Also at this time, the switch unit 23 closed after the closing of the switch unit 23 in response to the generation of the collision prediction signal may be opened again when the predetermined connection time has elapsed. Generally, the backup power supply 8 operates only for a short period of time. Therefore, the time for which the switch unit 23 is closed is limited, and the charge stored in the capacitor unit 11 is left to return to the standby state, and the backup power supply 8 may be prepared for further operation.

  In the above description, the control unit 21 is provided as an individual element in the backup power supply device 8, but is divided into the charging circuit unit 12, the booster circuit unit 13, the switch unit 23, etc. for each necessary function Or, it may be arranged after being distributed.

  The configuration and operation when the backup power supply 8 is mounted on a vehicle will be described below. FIG. 3 is a circuit block diagram showing a configuration of a vehicle 15 using the backup power supply 8 in the embodiment of the present invention. The vehicle 15 includes a vehicle body 15A, a vehicle battery (hereinafter referred to as a battery) 16 mounted on the vehicle body 15A, a backup power supply device 8, a load device 17, and an obstacle detection device 22. The battery 16 is connected to the power input unit 9 of the backup power supply 8. The load device 17 is connected to the output unit 10 of the backup power supply 8. The obstacle detection device 22 is connected to the control unit 21 via the collision prediction signal input unit 14. The power input unit 9 and the output unit 10 are connected by the normal power supply unit 18.

  Further, the normal power supply unit 18 is provided with a backflow prevention circuit unit 19. The normal power supply unit 18 may be included in the backup power supply 8 or may be provided on the vehicle body 15A outside the backup power supply 8 or any other suitable means. When the normal power supply unit 18 is provided in the vehicle 15 outside the backup power supply 8, one of the normal power supply units 18 is connected to the battery 16, and the other of the normal power supply units 18 is connected to the load device 17. It is done.

  Next, the operation of the vehicle 15 using the backup power supply 8 will be described. The normal operation and the emergency operation will be described below.

  The battery 16 supplies power to the load device 17 through the normal power supply 18 for most of the period except for a temporary period. The control unit 21 determines whether the normal operation is selected or the emergency operation is selected. The control unit 21 detects the voltage of the power supply input unit 9 and compares the voltage of the power supply input unit 9 with a threshold.

  If the voltage of the power supply input unit 9 is equal to or higher than the threshold value, the control unit 21 determines that the battery 16 is in a normal state, and does not operate the backup power supply device 8. At this time, even if the obstacle detection device 22 of the vehicle body 15A predicts the risk of a collision with an obstacle (not shown) or the like, the battery 16 is in a normal state, and the collision avoidance operation is performed. The load device 17 is normally supplied with sufficient power through the power supply unit 18. This is the normal operation described above, and the control unit 21 detects the voltage of the power supply input unit 9 and reflects the result to select the normal operation.

  In the normal operation, when the obstacle detection device 22 predicts the risk of collision with an obstacle (not shown) or the like, the obstacle detection device 22 transmits a collision prediction signal to the control unit 21. Then, the control unit 21 instructs, for example, a steering auxiliary power supply (not shown) or a brake corresponding power supply (not shown) which is the load device 17 to operate or operate these. do it.

  Here, as an example, the control unit 21 instructs and controls the load device 17. However, as a matter of course, individual load devices 17 such as a steering auxiliary power supply (not shown) and a power supply for braking (not shown) Inside, the load device 17 itself may instruct and control, to which the load device 17 may operate.

  However, partial charging that does not reach full charge to the capacitor unit 11 may be performed during normal operation in preparation for an emergency.

  In addition, the control unit 21 may perform the determination on the voltage of the battery 16 all the time or intermittently in each predetermined period. Alternatively, the control unit 21 may perform the determination on the voltage of the battery 16 at timing when an engine switch (not shown) is turned on when the vehicle 15 is activated. At this timing, the control unit 21 determines the voltage of the battery 16 so that the control unit 21 can recognize the state of the battery 16 in a state near no load.

  Furthermore, even if the control unit 21 determines the voltage of the battery 16 after the vehicle 15 has already started up, even if a large load such as an air conditioner (not shown) provided on the vehicle 15 is generated. Good. At this timing, the control unit 21 determines the voltage of the battery 16 so that the control unit 21 can recognize the state of the battery 16 under a load. In this case, since the voltage of the battery 16 tends to fluctuate, it is preferable that the control unit 21 intermittently perform the determination on the voltage of the battery 16 every short cycle.

  As a matter of course, the control unit 21 determines the voltage of the battery 16 when the engine switch (not shown) is turned on when the vehicle 15 is activated and a large load such as an air conditioner (not shown) is generated. It may be implemented at the same time as

  The load device 17 has a load drive unit 17A and a load unit 17B. When the load device 17 receives the supply of power from the battery 16, the load drive unit 17A converts the voltage of the battery 16 into an appropriate voltage for the load unit 17B to operate. Then, this voltage is applied to the load unit 17B. Alternatively, when the load device 17 receives the supply of power from the battery 16, the voltage of the battery 16 is applied to the load portion 17B without passing through the load drive portion 17A. Although a single load device 17 is shown in the drawing, a plurality of load devices 17 are actually disposed on the vehicle body 15A.

  The battery 16 is charged by the generator 20 while supplying power to the load device 17. The generator 20 generates power continuously or intermittently when the vehicle 15 is activated. Thereby, the battery 16 repeats discharge to the load device 17 and charge by the generator 20. Then, the voltage of the battery 16 is maintained within a predetermined range.

  The load device 17 can operate as long as the voltage of the battery 16 is within a predetermined range. For example, when the vehicle 15 is a general passenger car, when the vehicle 15 is in operation, the voltage of the battery 16 is about 13 V as a standard value, and the above-mentioned predetermined range is set based on this standard value.

  The voltage of the battery 16 may decrease depending on the use environment, the use period, and the like. However, if the vehicle 15 is started under normal driving conditions, the power of the battery 16 is normally supplied to the load device 17 through the power supply unit 18 even if the voltage of the battery 16 is, for example, about 12.4 V and near the lower limit. There is no big problem in particular. However, when the load device 17 consumes a large amount of power, a voltage shortage may occur.

  This is out of the range of the normal operation described above, and the control unit 21 selects the emergency operation. Then, at the same time as the control unit 21 is supplying power to the load device 17 using the normal power supply unit 18, the control unit 21 is also in a situation where the backup power supply unit 8 is on standby.

  The vehicle 15 using the backup power supply device 8 supplies power from the backup power supply device 8 to the load device 17 as described above when the voltage of the battery 16 decreases and the standby state in the emergency operation is performed. Further, this is when the obstacle detection device 22 of the vehicle body 15A predicts the risk of collision with an obstacle (not shown) or the like.

  The control unit 21 detects the voltage of the power supply input unit 9 and compares the voltage of the power supply input unit 9 with a threshold. When the voltage of the power supply input unit 9 is lower than the threshold, the control unit 21 determines that the battery 16 is in the deteriorated state or the output unstable state. At this time, the control unit 21, the collision prediction signal input unit 14, or the booster circuit unit 13 is in a state capable of receiving the collision prediction signal. As described above, the backup power supply 8 is in the standby state in the emergency operation. The threshold value here may be, for example, 12.6 V between 13 V and 12.4 V in consideration of the above value.

  In this state, when the obstacle detection device 22 predicts the risk of collision while the vehicle 15 is traveling, the obstacle detection device 22 transmits a collision prediction signal to the control unit 21 via the collision prediction signal input unit 14. Then, the control unit 21 recognizes the detection information on the battery 16 and the collision prediction signal. Thereby, power is supplied from the backup power supply device 8 to the load device 17. Alternatively, power is supplied from the backup power supply device 8 to the load device 17 for performing particularly the collision avoidance operation. In other words, when the obstacle detection device 22 predicts the risk of collision, the vehicle 15 including the backup power supply 8 switches from the standby state of the emergency operation to the power output state of the emergency operation.

  In the emergency operation of the vehicle 15 using the backup power supply device 8, the booster circuit unit 13 first uses the boosted voltage as a boosted voltage according to an instruction from the control unit 21 when the collision forecast signal input unit 14 receives the collision forecast signal. The 13V voltage of the example described above is output to the output unit 10. In other words, the booster circuit unit 13 outputs, to the output unit 10, a voltage equivalent to that when the battery 16 is in an appropriate state as a boosted voltage. Then, the boosted voltage is supplied from the output unit 10 to the load device 17 so that the load device 17 can operate properly.

  At this time, the voltage of the power supply input unit 9 is lower than the threshold, and the output unit 10 is boosted to 13 V as in the above example. In other words, the voltage of the output unit 10 is higher than the voltage of the power supply input unit 9. For this reason, the backflow prevention circuit unit 19 is provided in the normal power supply unit 18 that connects the power supply input unit 9 and the output unit 10. This prevents the battery 16 and the generator 20 from being degraded or damaged.

  For the backflow prevention circuit unit 19, a diode or a field effect transistor (hereinafter referred to as an FET) whose cathode side is connected to the output unit 10 may be used. Although not shown here, a P-channel type FET may be used, and the source side may be connected to the power input unit 9 or the battery 16, and the drain side may be connected to the output unit 10 or the load device 17. Accordingly, when the FET is in the OFF state, the current does not flow back from the output unit 10 to the power input unit 9 through the normal power supply unit 18. Further, when the voltage of the output unit 10 is lower than the voltage of the power supply input unit 9, even if the FET is in the OFF state, power is supplied from the battery 16 to the load device 17 by a parasitic diode existing inside the FET. be able to.

  The boosted voltage output from the booster circuit unit 13 is generated based on the charge stored in the capacitor unit 11. The capacitor unit 11 is charged to a voltage suitable for the capacitor unit 11 using the power from the battery 16 or the generator 20 by the charging circuit unit 12. The charging of the capacitor unit 11 by the charging circuit unit 12 may be performed in advance before the collision prediction signal input unit 14 can receive the collision prediction signal.

  In other words, it may be performed after the vehicle 15 is activated and before moving to travel. In particular, when the electric power of the generator 20 is used to charge the capacitor unit 11, charging of the capacitor unit 11 by the charging circuit unit 12 is performed by the control unit 21 immediately after the vehicle 15 is started. It may be performed regardless of the determination on the voltage.

  The charging voltage of the capacitor unit 11 is higher than the voltage of the battery 16 even when the voltage of the battery 16 is decreasing or the voltage fluctuation of the battery 16 is large and unstable. Because it is also low, it is easy to charge the capacitor section 11. Then, the charge of the capacitor unit 11 once charged is easily boosted by the booster circuit unit 13 to a stable boosted voltage.

  The switch unit 23 closed in response to the collision prediction signal being sent may be opened again when the predetermined connection time has elapsed after the closing. In general, the obstacle detection device 22 predicts the risk of a collision, and the vehicle 15 operates correspondingly for only a short period of time. Therefore, the time during which the switch portion 23 is closed is limited, and the charge stored in the capacitor portion 11 may be left to return to the standby state to prepare for a further risk of collision.

  The load device 17 can be applied as all the electrical components disposed on the vehicle body 15A. The backup power supply 8 particularly collides with electrical components that need to be concentrated in a short time, such as a steering auxiliary power supply (not shown) or a brake-compatible power supply (not shown) of the vehicle 15. For load devices 17 that operate using power to avoid power, power that these load devices 17 can operate properly can be supplied at an appropriate voltage.

  As described above, when the voltage of the power supply input unit 9 is lowered, when a sufficient voltage is required for emergency response to avoid a collision, the capacitor unit 11 with a small weight and the charging are mainly performed. A backup power supply 8 having an electric circuit consisting of the circuit unit 12 and the booster circuit unit 13 is used for power supply. Therefore, an auxiliary battery with a heavy secondary battery is not required. As a result, the backup power supply 8 is reduced in weight, and the fuel consumption of the vehicle 15 equipped with the backup power supply 8 is improved.

  In particular, the capacitor unit 11 is used as a storage element in the backup power supply 8. Therefore, it becomes easy for the backup power supply 8 to concentrate and output large power in a short time. Therefore, the backup power supply 8 can supply power to various electrical components as a power supply for emergency response such as in the collision avoidance operation. As a result, even when the battery 16 of the vehicle body 15A is degraded, the electrical system for collision avoidance operates properly.

  In addition, when the vehicle 15 is not activated, the capacitor unit 11 may be left uncharged. Therefore, the life of the capacitor unit 11 can be extended, and periodic replacement such as an auxiliary battery using a lead battery or the like is unnecessary, and maintenance is easy.

  Furthermore, the backup power supply 8 particularly supplies power to the load device 17 instead of the battery 16 as an emergency response when the battery 16 is deteriorated. Therefore, the battery 16 does not consume power at a timing that places a heavy load on the battery 16 at the time of emergency. Therefore, the battery 16 is further prevented from deterioration. Then, when the vehicle 15 continues to operate by returning to the normal response after the emergency response, the battery 16 is not affected by the power consumption associated with the emergency response. Thus, the vehicle 15 can continue its operation smoothly.

  In the figure, the collision prediction signal input unit 14 is connected to the booster circuit unit 13. Then, as described above, when the control unit 21 receives the collision prediction signal via the collision prediction signal input unit 14, the booster circuit unit 13 outputs a boosted voltage according to an instruction from the control unit 21.

  Although not illustrated, the control unit 21 may be built in the backup power supply 8 or may be disposed outside the backup power supply 8 in the vehicle 15. Alternatively, the control units 21 may be distributed in and out of the backup power supply device 8 for each function. For example, the control unit 21 may be incorporated in the backup power supply device 8 and have functions related to detection of the voltage of the power supply input unit 9 and control of the charging circuit unit 12 and the boosting circuit unit 13.

  Furthermore, the backup power supply 8 may supply power to the load 17 only when power is required from the individual functional units of the vehicle 15. FIG. 4 is a circuit block diagram showing a configuration of a vehicle 15 using another backup power supply device 8 in the embodiment of the present invention. The vehicle 15 is provided with the operation unit 25 connected to the control unit 21 via the operation signal input unit 24, and in the backup power supply 8, a switch unit 23 is further provided between the booster circuit unit 13 and the output unit 10. It is provided.

  The normal operation is the same as that described above with reference to FIG. Therefore, the description of the normal operation is omitted here. Although the emergency operation of the first procedure and the emergency operation of the second procedure will be described below, either the first procedure or the second procedure may be used as the emergency operation.

  First, the emergency operation of the first procedure will be described. The operation of the backup power supply device 8 and the vehicle 15 when the voltage of the power supply input unit 9 is lower than the threshold and the control unit 21 determines that the battery 16 is in the deteriorated state or the output unstable state will be described. At this time, the control unit 21, the collision prediction signal input unit 14, or the booster circuit unit 13 is in a state capable of receiving the collision prediction signal. As described above, the backup power supply 8 is in the standby state in the emergency operation.

  In this state, when the obstacle detection device 22 predicts the risk of a collision while the vehicle 15 is traveling, the obstacle detection device 22 transmits a collision prediction signal. As the obstacle detection device 22 predicts the risk of collision, the vehicle 15 including the backup power supply 8 switches from the emergency operation standby state to the emergency operation power output state. In response to the control unit 21 receiving a collision prediction signal via the collision prediction signal input unit 14, first, in response to an instruction from the control unit 21, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage. Boost up. After that, in response to the control unit 21 receiving the operation signal from the operation unit 25 of the vehicle body 15A via the operation signal input unit 24, the switch unit 23 which has been opened by the instruction from the control unit 21 is closed. Thereby, the boosted voltage is supplied from the output unit 10 to the load device 17. Then, the load device 17 becomes operable.

  Here, the operation unit 25 may be, for example, a steering (not shown) or a brake pedal (not shown), and an operation signal is issued when the driver operates the steering or depresses the brake pedal. It is good. The load device 17 corresponding to these operations may be a steering assist power supply (not shown) or a brake-compliant auxiliary power supply (not shown).

  More specifically, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage by the obstacle detection device 22 predicting the risk of collision. At this time, since the switch unit 23 is open, no power is supplied to the steering assist power supply which is the load device 17 and the auxiliary power supply for braking. Then, the driver recognizes the danger and operates the steering and the brake, whereby the operation unit 25 transmits an operation signal. The control unit 21 receives the operation signal, and the switch unit 23 closes in response to an instruction from the control unit 21. As a result, significant turning or sudden stopping of the vehicle 15 becomes possible in a short time, and the vehicle 15 becomes easy to operate so as to avoid a collision with an obstacle (not shown) or the like.

  Further, even if the control unit 21 generates the operation signal according to the time after the control unit 21 receives the collision prediction signal before the operation unit 25 receives the operation signal, even if the switch unit 23 is closed. Good. In other words, although the collision prediction signal input unit 14 and the operation signal input unit 24 are provided separately, they may be integrated into one or the other. Then, the control unit 21 may obtain a collision prediction signal from either one, and may generate an operation signal after a predetermined time with respect to the collision prediction signal. Alternatively, the collision prediction signal and the operation signal may be transmitted simultaneously. Alternatively, the collision prediction signal and the operation signal may be configured by different electric signals, and the control unit 21 may determine which signal is received.

  Thus, a predetermined boosted voltage is output from the output unit 10 according to the required timing. Therefore, backup power supply 8 outputs a boosted voltage according to the operation required by the operation signal from operation unit 25. As a result, the limited power stored in the capacitor unit 11 can be repeatedly used for emergency operation.

  The emergency operation of the second procedure different from the order of the emergency operation described above will be described below. Again, the normal operation is the same as described above with reference to FIG. Therefore, the description of the normal operation is omitted.

  At the time when the voltage of the power supply input unit 9 is lower than the threshold and the control unit 21 determines that the battery 16 is in the deteriorated state or the output unstable state, it is possible to accept the collision prediction signal also in the second procedure. In this state, the backup power supply 8 is in the standby state in the emergency operation. In the emergency operation of the second procedure, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage according to an instruction from the control unit 21 in the standby state. In other words, in the state where the control unit 21 and the collision prediction signal input unit 14 can receive the collision prediction signal, the booster circuit unit 13 has already completed and continued the boosting operation.

  In the standby state in the emergency operation, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage in the standby state in the emergency operation. After that, in response to the control unit 21 receiving the collision prediction signal via the collision prediction signal input unit 14, the switch unit 23 which has been opened up by the instruction from the control unit 21 is closed. Thereby, the boosted voltage is supplied from the output unit 10 to the load device 17. Then, the load device 17 becomes operable.

  Therefore, since the backup power supply 8 generates the boosted voltage in the standby state, the backup power supply 8 immediately outputs a stable voltage in response to the reception of the collision prediction signal. As a result, the backup power supply 8 can drive the load device 17 connected to the output unit 10 quickly and accurately. In particular, when the backup power supply device 8 needs to output a predetermined voltage in a short time after the control unit 21 receives the collision prediction signal input unit 14, the power may be accurately supplied to the load device 17. It becomes possible.

  Here, even if the switch unit 23 is closed immediately and the voltage is output in response to the reception of the collision prediction signal, the backup power supply device 8 is opened after the reception of the collision prediction signal and the elapse of a predetermined period. The switch unit 23 may be closed. In addition, when the control unit 21 receives the operation signal during the predetermined period described above and both the collision prediction signal and the operation signal are received, the control unit 21 does not wait for the predetermined period to elapse but at that time. The switch unit 23 which has been open may be closed.

  Also in the second procedure, the collision prediction signal input unit 14 and the operation signal input unit 24 may be provided as a single input unit or may be provided separately. Then, the control unit 21 may obtain a collision prediction signal from either one, and may generate an operation signal after a predetermined time with respect to the collision prediction signal. Alternatively, the collision prediction signal and the operation signal may be transmitted simultaneously. Alternatively, the collision prediction signal and the operation signal may be configured by different electric signals, and the control unit 21 may determine which signal is received.

  The switch unit 23 closed in response to the collision prediction signal being sent may be opened again when the predetermined connection time has elapsed after the closing. In general, the obstacle detection device 22 predicts the risk of a collision, and the vehicle 15 operates correspondingly for only a short period of time. Therefore, the time during which the switch portion 23 is closed is limited, and the charge stored in the capacitor portion 11 may be left to return to the standby state to prepare for a further risk of collision.

  Further, in the second procedure, in the emergency operation standby state, the booster circuit unit 13 boosts the voltage stored in the capacitor unit 11 to a predetermined boosted voltage according to an instruction from the control unit 21. For this reason, although the electric power is small, in the emergency operation standby state, the charge stored in the capacitor unit 11 continues to be consumed. For this reason, in the emergency operation standby state, the capacitor unit 11 may be charged by the battery 16 or the generator 20 at such a timing that the possibility of a collision with an obstacle when the vehicle 15 stops is extremely low. Good. This charging operation may not be performed each time the vehicle 15 stops, but may be performed when the vehicle 15 stops under conditions such as when the state of charge in the capacitor unit 11 falls below the charging threshold. On the other hand, by repeating charging and discharging in this manner, the life of capacitor portion 11 can be extended.

  In the above description, the control unit 21 is disposed in the backup power supply 8 or in the vehicle body 15A in order to control the operation of the backup power supply 8. The individual control units 21 are arranged as described above for the convenience of description, and as described above, the control units 21 may be distributed or subdivided for each function. Good. Alternatively, although not shown here, the control unit 21 may be included in an electronic control unit which is disposed on the vehicle body 15A and grasps the electrical control of the entire vehicle 15.

  The backup power supply device of the present invention has an effect of improving the fuel consumption of the vehicle by reducing the weight of the vehicle, and is useful in various electronic devices for vehicles.

DESCRIPTION OF SYMBOLS 8 Backup power supply device 9 Power supply input part 10 Output part 11 Capacitor part 12 Charging circuit part 13 Boost circuit part 14 Collision prediction signal input part 15 Vehicle 15A Car body 16 Vehicle battery (battery)
17 load device 17A load drive unit 17B load unit 18 normal power supply unit 19 reverse current prevention circuit unit 20 generator 21 control unit 22 obstacle detection device 23 switch unit 24 operation signal input unit 25 operation unit

Claims (8)

A power input unit,
An output unit,
A capacitor unit,
A charging circuit unit provided in a charging path from the power supply input unit to the capacitor unit;
A booster circuit unit provided in the output path to the capacitor unit and the output unit;
A collision prediction signal input unit;
The capacitor unit is charged to a charging voltage by the charging circuit in advance.
When the voltage of the power supply input unit is lower than a threshold, the boosted voltage boosted from the charging voltage in the booster circuit unit is output from the output unit in response to the collision prediction signal input unit receiving a signal. Output,
Backup power supply. A switch unit provided between the booster circuit unit and the output unit;
And an operation signal input unit,
When the voltage of the power supply input unit is lower than a threshold, the booster circuit unit first boosts the charging voltage to the boosted voltage in response to the signal received by the collision prediction signal input unit, and thereafter, When the operation signal input unit receives a signal, the switch unit is closed, and the boosted voltage is output from the output unit.
The backup power supply device according to claim 1. It further comprises a switch unit provided between the booster circuit unit and the output unit,
In response to the voltage of the power supply input unit being lower than the threshold, the boosting circuit unit constantly boosts the charging voltage to a boosted voltage, and thereafter, the collision prediction signal input unit receives a signal. Accordingly, the switch unit is closed, and the boosted voltage is output from the output unit.
The backup power supply device according to claim 1. It further comprises a normal power supply unit connecting the power supply input unit and the output unit,
The normal power supply unit is provided with a backflow prevention circuit unit.
The backup power supply device according to claim 1. Further comprising a control unit,
The control unit detects a voltage of the power input unit,
The collision prediction signal is transmitted to the collision prediction signal input unit in response to an external signal.
The backup power supply device according to claim 1. With the car body,
A backup power supply provided on a vehicle body, a vehicle battery connected to an input of the backup power supply, a load connected to an output of the backup power supply, and a backup power supply connected to the backup power supply A control unit, an obstacle detection device connected to the control unit, and a normal power supply unit connecting the vehicle battery and the load device;
The backup power supply is
A capacitor unit, a charging circuit unit provided in a charge path from the input unit to the capacitor unit, and a booster circuit unit provided in an output path to the capacitor unit and the output unit;
The capacitor unit is charged to a charging voltage by the charging circuit in advance.
When the control unit detects that the voltage of the input unit is lower than a threshold, the boosted voltage boosted from the charging voltage by the booster circuit unit is in response to the obstacle detection device detecting an obstacle. A vehicle driven by the load device from the output unit to the load device. A switch unit provided between the booster circuit unit and the output unit;
And a control unit connected to the control unit.
When the control unit detects that the voltage of the input unit is lower than a threshold value, the boost circuit unit first receives the charge voltage in response to the control unit receiving a collision prediction signal from the obstacle detection device. After boosting to the boosted voltage, the switch unit is closed in response to the control unit receiving an operation signal from the operating unit, and the boosted voltage is output from the output unit to the load device. The vehicle according to claim 6, wherein the load device is driven. A switch unit provided between the booster circuit unit and the output unit;
And a control unit connected to the control unit.
In response to the control unit detecting that the voltage of the input unit is lower than the threshold, the boosting circuit unit constantly boosts the charging voltage to a boosted voltage, and thereafter, the control unit operates the operation unit The vehicle according to claim 6, wherein the switch unit is closed in response to receiving an operation signal from the control unit, the boosted voltage is output from the output unit to the load device, and the load device is driven.

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