JP2015003560A - Output device and load power-feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an output device capable of assuring a power-feeding route for feeding power to a load when the load is not fed with power because of disconnection, and a load power-feeding system equipped with the output device.SOLUTION: An output device 12 includes a transformation part which transforms a voltage that is applied from outside, and outputs a voltage that has been transformed by the transformation part through a first terminal T1 or a second terminal T2. It includes a switch 42 provided between the first terminal T1 and the second terminal T2, a detection part 52 for detecting a voltage value of the first terminal T1, and a control part 22 which turns the switch 42 on if the voltage value detected by the detection part 52 is less than a predetermined value.

Description

  The present invention relates to an output device that transforms and outputs an applied voltage to control power supply to a load, and a load power supply system including the output device.

  Currently, vehicles such as HEV (Hybrid Electric Vehicle) or EV (Electric Vehicle) are widely used. Such a vehicle is equipped with a power supply device that generates regenerative power in a generator by converting the kinetic energy of the vehicle into electric power when the vehicle decelerates and supplies the generated regenerative power to a load. (For example, refer to Patent Document 1).

  FIG. 3 is a block diagram showing a configuration of a conventional load feeding system as described in Patent Document 1. As shown in FIG. In the conventional load power supply system 5, the output end of the generator 10 is connected to one end of the auxiliary power supply 11 and one end of the DC / DC converter 32. The other end of the DC / DC converter 32 is connected to one end of the storage battery 14 via the electric wire 13. One end of the storage battery 14 is connected to a starter 18 and is connected to a load 16 via an electric wire 15. The generator 10, the auxiliary power source 11, the storage battery 14, the load 16 and the starter 18 are grounded.

  When the vehicle decelerates, the generator 10 generates regenerative power by converting the kinetic energy of the vehicle into electric power. When regenerative power is generated, the generator 10 supplies power to the auxiliary power supply 11, and the output voltage of the generator 10 is applied to one end of the DC / DC converter 32. The DC / DC converter 32 transforms the voltage applied to one end, and applies the transformed voltage to one end of the storage battery 14 via the electric wire 13. Thereafter, the voltage applied to the storage battery 14 is applied to the load 16 via the electric wire 15, and the load 16 is fed. As described above, when the vehicle is decelerated, the electric power converted by the generator 10 from the kinetic energy of the vehicle is stored in the auxiliary power source 11 and used for feeding the load 16. For this reason, the kinetic energy of the vehicle is efficiently used without being consumed by friction between the tire and the ground.

JP 2010-83178 A

  However, when the electric wire 13 is disconnected in the configuration of the load power supply system as shown in FIG. 3, the voltage generated by the generator 10 is not applied to one end of the storage battery 14 via the DC / DC converter 32. The load 16 cannot be supplied via the power supply. Similarly, since the voltage generated from the auxiliary power supply 11 charged by the generator 10 is not applied to one end of the storage battery 14 via the DC / DC converter 32, the load 16 cannot be fed via the electric wire 15. Therefore, the load 16 can be operated by supplying the load 16 by the amount of power supplied to the storage battery 14 before the electric wire 13 is disconnected. However, when the amount of power stored in the storage battery 14 is lost, the operation of the load 16 is May stop.

  When the electric wire 15 is disconnected, the output voltage of the generator 10 or the auxiliary power supply 11 is applied to one end of the storage battery 14 via the DC / DC converter 32, but the voltage applied to the storage battery 14 is applied via the electric wire 15. And not applied to the load 16. Therefore, when the electric wire 15 is disconnected, the load 16 cannot supply power, and thus the operation of the load 16 may stop.

  As described above, when the wire 13 or the wire 15 is disconnected in the configuration of the load power supply system of FIG. 3, there is a possibility that the operation of the load 16 is stopped without securing a power supply path for supplying power to the load 16. In particular, when the load 16 is a load related to an operation that is highly necessary for the safety of the user in the operation of the vehicle, if the electric wire 13 or the electric wire 15 is disconnected, there is a possibility of causing a danger to the user of the vehicle. high.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an output device capable of securing a power supply path for supplying power to the load even when power cannot be supplied to the load due to disconnection, and the output. It is providing the load electric power feeding system provided with an apparatus.

  An output device according to the present invention is an output device that includes a transformer that transforms a voltage applied from the outside, and that outputs a voltage transformed by the transformer from a first terminal or a second terminal, wherein the first terminal And a switch provided between the second terminals, a detection unit for detecting the voltage value of the first terminal, and turning on the switch when the voltage value detected by the detection unit is less than a predetermined value And a control unit.

  In the present invention, in the output device that outputs the external voltage transformed by the transformer unit from the first terminal or the second terminal, control is performed when the voltage value of the first terminal detected by the detector is less than a predetermined value. The part turns on a switch provided between the first terminal and the second terminal.

  The output device according to the present invention is characterized in that the detection unit is configured to detect a voltage value of the second terminal.

  In the present invention, the detection unit also detects the voltage value of the second terminal.

  The output device according to the present invention is characterized in that the switch is a semiconductor switch.

  In the present invention, the switch is a semiconductor switch.

  In the output device according to the present invention, the switch further includes first protection means for protecting a downstream electric wire.

  In the present invention, the switch includes first protection means for protecting the downstream electric wire.

  A load power supply system according to the present invention includes a load and a storage battery to which the output device according to any one of the above, the first terminal and the second terminal are connected, and the transformed voltage is applied from the output device. It is characterized by providing.

  In the present invention, the load and the storage battery are connected to the first terminal and the second terminal in the load power supply system including the output device, the load to which the transformed voltage is applied from the output device, and the storage battery.

  The load power feeding system according to the present invention is characterized in that a second protective means for protecting a downstream electric wire is connected to the first terminal.

  In the present invention, the second protection means for protecting the downstream electric wire is connected to the first terminal.

  According to the present invention, even when power cannot be supplied to the load due to disconnection, it is possible to reduce the stoppage of load operation caused by insufficient supply of power to the load by securing a power supply path for supplying power to the load.

It is a block diagram which shows the structure of the load electric power feeding system which concerns on embodiment of this invention. It is a flowchart which shows the process sequence which supplies electric power to the load which concerns on embodiment of this invention. It is a block diagram which shows the structure of the conventional load electric power feeding system.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a configuration of a load power feeding system according to an embodiment of the present invention. The load feeding system 1 is suitably mounted on a vehicle and includes a generator 10, an auxiliary power supply 11, an output device 12, a storage battery 14, loads 16 and 17, and a starter 18. The output device 12 includes a control unit 22, a DC / DC converter 32, a switch 42, a detection unit 52, a notification unit 62, and a fuse 72. The output end of the generator 10 is connected to one end of the auxiliary power supply 11 and one end of the output device 12. A first terminal T <b> 1 that is an output terminal of the output device 12 is connected to one end of the storage battery 14 via an electric wire 13. Further, the second terminal T <b> 2 that is the output terminal of the output device 12 is connected to the load 16 via the electric wire 19. One end of the storage battery 14 is connected to a starter 18 and is connected to a load 16 via an electric wire 15. Furthermore, one end of the storage battery 14 is connected to the load 17. One end of each of the generator 10, the starter 18 and the loads 16 and 17, and the negative terminals of the auxiliary power supply 11 and the storage battery 14 are grounded.

  The generator 10 generates electric power in conjunction with an unillustrated engine of a vehicle on which the load power feeding system 1 is mounted, and generates regenerative electric power by converting the kinetic energy of the vehicle into electric power when the vehicle decelerates. To do. Specifically, the generator 10 generates AC power both when generating power in conjunction with the engine and when generating regenerative power, and rectifies the generated AC power into DC power. The power, voltage, and current generated by the generator 10 are the rectified power, voltage, and current, respectively. The output end of the generator 10 is connected to one end of the auxiliary power supply 11 and one end of the DC / DC converter 32 of the output device 12. The generator 10 is generated at one end of the auxiliary power supply 11 and one end of the DC / DC converter 32 in order to supply regenerative power to the loads 16 and 17 when generating regenerative power, that is, when the vehicle decelerates. Apply the selected voltage.

  The output voltage of the generator 10 is applied to one end of the auxiliary power supply 11, and the auxiliary power supply 11 stores the power output from the generator 10. When the auxiliary power source 11 does not generate regenerative power, that is, when the vehicle travels at a constant speed or accelerates without being decelerated, the auxiliary power source 11 is supplied with DC / An output voltage is applied to one end of the DC converter 32. The auxiliary power supply 11 is an electric double layer capacitor or a lithium ion battery.

  The storage battery 14 is, for example, a lead battery. A voltage transformed by the DC / DC converter 32 is applied to the storage battery 14 via the electric wire 13, and the storage battery 14 stores electricity by application of the voltage transformed by the DC / DC converter 32.

  In addition to the terminals connected to the DC / DC converter 32, the storage battery 14 has terminals connected to the loads 16 and 17 and the starter 18. The output voltage from the other end of the DC / DC converter 32 is applied to the load 16 via the electric wire 15, and the load 16 is supplied with power. Further, the load 17 and the starter 18 are supplied with power by the voltage applied to the storage battery 14. The starter 18 is a motor for starting the engine.

The load 16 corresponds to a load that has a high possibility of causing a danger to the vehicle user when the vehicle is not operating among the vehicle operations such as running, turning, and stopping. For example, the load 16 includes an engine ECU (Electronic Control Unit), an engine related sensor (O ₂ sensor, A / F sensor), injection, ignition coil, stop lamp, continuously variable transmission (CVT), throttle motor or In-vehicle equipment such as meters.

  The load 17 corresponds to a load that is less likely to cause danger to the user of the vehicle even when the vehicle is not operating. For example, the load 17 is an in-vehicle device such as an A / C compressor, a fog lamp, a rear defogger, a seat heater, a room lamp, a car navigation system, or an audio device.

  The voltage generated by the generator 10 or the output voltage from the auxiliary power supply 11 is applied to the DC / DC converter 32, and the applied voltage is transformed by the DC / DC converter 32, and then the transformed voltage is transformed into the storage battery 14 and the load. By being applied to 16 and 17, the loads 16 and 17 are powered to operate. Both of the loads 16 and 17 may be composed of a plurality.

  The DC / DC converter 32 transforms the output voltage of the generator 10 or the auxiliary power supply 11 input from one end. In this way, the DC / DC converter 32 operates as a transformer that selectively transforms the output voltage of the generator 10 or the auxiliary power supply 11. The DC / DC converter 32 transforms the output voltage of the generator 10 or the auxiliary power source 11 by stepping up and stepping down, and a constant voltage obtained by the transformation is passed from the other end to one end of the storage battery 14 via the electric wire 13. Apply.

  The control unit 22 controls the operation of the DC / DC converter 32 and the on / off of the switch 42. Specifically, the control unit 22 causes the DC / DC converter 32 to convert a voltage by repeatedly turning on / off a plurality of switches (not shown) that the DC / DC converter 32 has with a coil (not shown). The controller 22 can stop the operation of the DC / DC converter 32 by operating each of a plurality of switches (not shown). Furthermore, the control unit 22 can adjust the step-up or step-down width of the DC / DC converter 32 by changing the on / off duty of each of one or a plurality of switches (not shown).

  The switch 42 is connected to the DC / DC converter 32, and one end is connected to the load 16 through the electric wire 19. The switch 42 is a semiconductor switch, and is an FET (Field Effect Transistor) or a bipolar transistor. The switch 42 is turned on / off by the control unit 22. When the electric wire 13 or the electric wire 15 has no trouble such as disconnection, the control unit 22 performs control so that the switch 42 is maintained in the OFF state.

  A fuse 72 is provided so as to be connected in series to the switch 42. The fuse 72 functions as a protection means for protecting the downstream electric wire 19. As will be described later, when the switch 42 is turned on due to the malfunction of the electric wire 13 or the electric wire 15, the voltage transformed by the DC / DC converter 32 is applied to the load 16 via the switch 42 and the electric wire 19. The load 16 is supplied with power. When the fuse 72 is connected to the switch 42, the fuse 72 is blown when the electric wire 19 is short-circuited and a large amount of current flows. Therefore, the load 16 can be protected from damage due to overcurrent. In this embodiment, a fuse is used as a protection means, but PTC (Positive Temperature Coefficient) or the like may be used. Further, the protection means may be configured by an electronic circuit, and when the electric current 19 cannot be protected by measuring the current, an abnormality signal is sent from the protection means to the control unit 22, and the switch 42 is controlled by the control signal from the control unit 22. Turned off. Furthermore, it is possible to incorporate such a function of the electronic circuit into the semiconductor switch. In this case, the switch 42 can be turned off based on the detection result of the protection means regardless of the control signal from the control unit 22. The fuse 72 is the first protection means in the present invention.

  Further, a fuse 73 is connected to the electric wire 13. The fuse 73 is connected to the first terminal T1. The fuse 73 functions as a protection means for protecting the downstream electric wire 13. When the fuse 73 is provided in the electric wire 13, the fuse 73 is blown when the electric wire 13 is short-circuited and a large amount of current flows. Therefore, the storage battery 14 and the loads 16 and 17 can be protected from damage due to overcurrent caused by a short circuit. As described above, in this embodiment, a fuse is used as a protection means, but a PTC or the like may be used. The fuse 73 is the second protection means in the present invention.

  The voltage of the generator 10 or the auxiliary power supply 11 is transformed by the output device 12, and the transformed voltage is supplied to the storage battery 14, the loads 16, 17 and the starter 18. When the electric wire 13 or the electric wire 15 is disconnected, the load 16 is fed by the output device 12 via the electric wire 19. First, a method for supplying power to the load 16 after detecting disconnection by the electric wire 13 will be described below.

  The detection unit 52 detects the voltage value of the first terminal T1. The first terminal T <b> 1 is a terminal connected between the DC / DC converter 32 and the storage battery 14 and is an output terminal of the output device 12. When a malfunction such as disconnection occurs in the electric wire 13, the voltage value of the first terminal T <b> 1 becomes lower than a predetermined value assumed as the output voltage of the DC / DC converter 32. For example, when the wire 13 is disconnected, the voltage value of the first terminal T1 is 0V. Therefore, when the detection unit 52 detects that the voltage value of the first terminal T1 is lower than the predetermined value, the control unit 22 determines that a defect such as disconnection has occurred in the electric wire 13 based on the detection result of the detection unit 52. To do. The detection unit 52 notifies the control unit 22 of the detection result.

  For example, when the electric wire 13 is disconnected, the output voltage of the generator 10 when the regenerative power is generated or the output voltage of the auxiliary power supply 11 when the regenerative power is not generated is transformed by the DC / DC converter 32 and transformed. A voltage is not applied to the storage battery 14 via the electric wire 13. Therefore, in order to supply power to the load 16, when the control unit 22 determines that the wire 13 is disconnected based on the detection result of the detection unit 52, the control unit 22 controls the switch 42 to turn on the switch 42. To do. When the switch 42 is turned on, the generator 10, the auxiliary power supply 11, the load 16, and the storage battery 14 are connected via the switch 42. When the switch 42 is turned on, a lamp (not shown) is turned on by the notification unit 62 and a message is displayed on a display unit (not shown) to notify the vehicle user that the electric wire 13 is disconnected.

  When regenerative power is generated, the output voltage from the generator 10 is applied to the auxiliary power supply 11, and the auxiliary power supply 11 stores the power output from the generator 10. Therefore, the power stored in the auxiliary power supply 11 is loaded by transforming the output voltage from the auxiliary power supply 11 via the DC / DC converter 32 and applying the transformed voltage to the load 16 via the switch 42 and the electric wire 19. 16 is supplied.

  When the electric power stored in the auxiliary power supply 11 is lost, the generator 10 generates electric power in conjunction with the engine. Electric power is supplied from the generator 10 to the load 16 by transforming the output voltage from the generator 10 via the DC / DC converter 32 and applying the transformed voltage to the load 16 via the switch 42 and the electric wire 19. To do.

  When the control unit 22 determines the disconnection of the electric wire 13 based on the detection result of the detection unit 52, the output voltage from the generator 10 or the auxiliary power supply 11 is transformed by the DC / DC converter 32 and the switch 42 and the electric wire 19 are used. Then, the transformed voltage is applied to the load 16 to supply power to the load 16. Therefore, since the operation of the load 16 does not stop due to insufficient power supply, no problem occurs in the operation of the vehicle. In addition, since the load 16, the storage battery 14, and the load 17 are in a connected state, power can be supplied to the load 17 via the electric wire 15 and the storage battery 14 using the path that supplies power to the load 16 as described above.

  Next, a method for supplying power to the load 16 after detecting the disconnection of the electric wire 15 will be described below. The detection unit 52 detects the voltage value of the second terminal T2. The second terminal T <b> 2 is a terminal connected between the DC / DC converter 32 and the load 16 and is an output terminal of the output device 12.

  When a malfunction such as disconnection occurs in the electric wire 15, the voltage value of the second terminal T <b> 2 becomes lower than a predetermined value assumed as the output voltage of the DC / DC converter 32. For example, when the wire 15 is disconnected, the voltage value of the second terminal T2 is 0V. Therefore, when the detection unit 52 detects that the voltage value of the second terminal T2 is lower than the predetermined value, the control unit 22 determines that a defect such as disconnection has occurred in the electric wire 15 based on the detection result of the detection unit 52. To do. The detection unit 52 notifies the control unit 22 of the detection result.

  For example, when the electric wire 15 is disconnected, the output voltage of the generator 10 when the regenerative power is generated or the output voltage of the auxiliary power supply 11 when the regenerative power is not generated is transformed by the DC / DC converter 32 and transformed. Although voltage is applied to the storage battery 14, it is not applied to the load 16 via the electric wire 15. That is, no power is supplied to the load 16. Therefore, when the control unit 22 determines that the electric wire 15 is disconnected in order to supply power to the load 16, the control unit 22 performs control so that the switch 42 is turned on. When the switch 42 is turned on, the generator 10, the auxiliary power source 11, and the load 16 are connected via the switch 42. And the alerting | reporting part 62 notifies the user of the vehicle that the electric wire 15 is disconnected.

  After the switch 42 is turned on, the output voltage from the generator 10 or the auxiliary power supply 11 is transformed via the DC / DC converter 32 in the same manner as when the electric wire 13 is disconnected, and the switch 42 and the electric wire 19 are used. The transformed voltage is applied to the load 16 to supply power to the load 16. Therefore, since the operation of the load 16 does not stop due to insufficient power supply, no problem occurs in the operation of the vehicle. Further, power can be supplied to the load 17 via the electric wire 13 and the storage battery 14.

  FIG. 2 is a flowchart showing a processing procedure for supplying power to the load according to the embodiment of the present invention. In addition, the following operation | movement is operation | movement in the state in which the engine is act | operated by the starter 18 using the electric power charged by the storage battery 14. FIG. First, the detection unit 52 detects the voltage value of the first terminal T1 as the first voltage value (step S1). Next, the detection unit 52 detects the voltage value of the second terminal T2 as the second voltage value (step S2).

  The controller 22 determines whether or not the first voltage value or the second voltage value is lower than a predetermined value (step S3). When the control unit 22 determines that the first voltage value or the second voltage value is lower than the predetermined value, the control unit 22 determines that the electric wire 13 or the electric wire 15 is disconnected.

  When the control unit 22 determines that the first voltage value or the second voltage value is greater than or equal to a predetermined value (step S3: NO), the control unit 22 determines that the electric wire 13 and the electric wire 15 are not disconnected. . Under the control of the control unit 22, the output voltage of the generator 10 when regenerative power is generated or the output voltage of the auxiliary power supply 11 when regenerative power is not generated is applied to the DC / DC converter 32. Electric power is supplied to the load 16 by applying the voltage transformed by the voltage to the storage battery 14 via the electric wire 13 and applying the voltage applied to the storage battery 14 to the load 16 via the electric wire 15. That is, since the control unit 22 determines that the system is in a normal state where no disconnection has occurred in the system, the switch 42 is maintained in an off state. Since the switch 42 is turned off, power based on the output voltage of the generator 10 or the auxiliary power supply 11 is not supplied to the load 16 via the switch 42 and the electric wire 19. Further, power is supplied to the load 17 so as to be supplied to the load 16.

  When the control unit 22 determines that the first voltage value or the second voltage value is lower than the predetermined value (step S3: YES), the control unit 22 determines that the electric wire 13 or the electric wire 15 is disconnected. The control unit 22 turns on the switch 42 in order to supply power to the load 16 regardless of which of the electric wire 13 and the electric wire 15 is disconnected (step S4). And the alerting | reporting part 62 alert | reports to the vehicle user that the electric wire 13 or the electric wire 15 is disconnected (step S5). Therefore, the output voltage from the generator 10 or the auxiliary power supply 11 is transformed via the DC / DC converter 32 and the load 16 is fed by applying the transformed voltage to the load 16 via the switch 42 and the electric wire 19. .

  In the load power supply system configured as described above, even when the electric wire 13 or the electric wire 15 is disconnected, a power supply path for supplying power to the load 16 can be preferentially secured. The probability of stopping the operation is low. Therefore, when the load 16 is a load related to an operation that is highly necessary for the safety of the user during the operation of the vehicle, the possibility of causing a danger to the user of the vehicle is low.

  In the present embodiment, the detection unit 52 detects the first voltage value and the second voltage value, but the control unit 22 may detect the voltage value. Further, when it is determined in step S3 that the electric wire has been disconnected, whether or not there is a disconnection may be determined based on whether or not a state in which the first voltage value or the second voltage value is lower than a predetermined value continues for a predetermined period. The predetermined value can be determined based on a voltage drop in the electric wire, and the predetermined period can be determined based on the influence of noise or the like. If the presence or absence of disconnection is determined by such a configuration, the determination accuracy of disconnection increases.

  The disclosed embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Load electric power feeding system 10 Generator 11 Auxiliary power supply 13, 15, 19 Electric wire 14 Storage battery 16, 17 Load 22 Control part 32 DC / DC converter 42 Switch 52 Detection part 72, 73 Fuse T1 1st terminal T2 2nd terminal

Claims (6)

An output device comprising a transformer for transforming a voltage applied from the outside, and outputting the voltage transformed by the transformer from the first terminal or the second terminal,
A switch provided between the first terminal and the second terminal;
A detector for detecting a voltage value of the first terminal;
An output device comprising: a control unit that turns on the switch when the voltage value detected by the detection unit is less than a predetermined value.   The output device according to claim 1, wherein the detection unit is configured to detect a voltage value of the second terminal.   The output device according to claim 1, wherein the switch is a semiconductor switch.   The output device according to claim 3, wherein the switch further includes first protection means for protecting a downstream electric wire. An output device according to any one of claims 1 to 4,
A load and a storage battery connected to the first terminal and the second terminal, to which the transformed voltage is applied from the output device;
A load feeding system comprising:   The load feeding system according to claim 5, wherein second protection means for protecting a downstream electric wire is connected to the first terminal.

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