JP2006020404A - Vehicle power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protection means for maintaining an abnormality sensing state until a cause of the abnormality is eliminated at an abnormal node, and a vehicle power supply system having a part of nodes for normally supplying power even if two lines is grounded by a trouble in power supply lines. <P>SOLUTION: Circuit protecting sections 8A, 9A, 8B, 9B are disposed upstream and downstream of connections 6, 7 between two independent systems of power supplies 2, 3 and the power supply lines 4, 5 formed as a loop. A plurality of the nodes 11a, 11b, 11c, 11d are provided with load controllers 10 for controlling electrical loads disposed and distributed in the vehicle, and connected to the power supply lines 4, 5 through inverse current preventing diodes 12. Although the power supply lines 4, 5 are formed as the loop, one open section is added to each line. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle power supply system that supplies power such as a power source to a system that controls a load of various electrical components, devices, equipment, and the like mounted on a vehicle, and particularly to a plurality of electrical components. The present invention relates to a vehicle power supply system that appropriately protects a power supply even when a failure occurs in a power supply loop, and allows power supply to an important load without trouble.

  Recently, the electric load on vehicles has been increasing, and while the power supply system and signal system for electronic control of the main engine and auxiliary equipment have increased, the instrumentation on the front panel has been changed to an electronic display system, etc. Many electrical components have been installed. Accordingly, the increase of power supply systems and signal systems has become a major issue, and standardization and rationalization of power supply systems and signal systems are being promoted in order to ensure the reliability. As an example, a CAN (controller area network) system is applied to the backbone as a signal system, while an in-vehicle LAN using a LIN (local interconnect network) system is adopted for terminal communication. The CAN system for the core part is adopting CSMA / CD as a communication method, and standardization is progressing such that each controller performs autonomous distributed control.

  On the other hand, rationalization and standardization have been delayed in the vicinity of the vehicle and the like. In particular, with regard to the power supply system, a power line is laid for each individual device to supply power. Therefore, at present, protection means for protecting the power supply is also installed in each power supply line.

  Generally, a fuse, an IPS, a PTC element or the like is used as a circuit protection unit for protecting the power supply. The fuse is blown when the load current becomes larger than a predetermined value to stop the power supply to the load. An IPS (intelligent power switch) detects an overcurrent with a shunt resistor or the like and turns off the semiconductor switch. Furthermore, a PTC (positive temperature coefficient) element suppresses a load current by a resistance change due to heat generation due to an overcurrent, using a characteristic that resistance increases as its temperature rises.

  Japanese Patent Application Laid-Open No. 5-64361 discloses that two independent power supply lines are routed to a plurality of load controllers that control auxiliary equipment for a vehicle, so that any one of the power supply lines in the event of a collision or the like. Even if a short circuit occurs, power supply to all the auxiliary machines is continued. Here, in order to route a plurality of load controllers to two independent power supply lines, a backflow prevention diode is interposed for all the load controllers.

Japanese Patent Laid-Open No. 10-262330 performs information exchange between adjacent power distribution devices via a multiple signal transmission unit, and identifies and eliminates a failure point based on the information.
JP-A-5-64361 JP-A-10-262330

      However, the standardization and rationalization of the power supply system and signal system have hardly progressed in the LIN system for the peripheral parts of vehicles such as doors, roofs, and back doors. This is because the area where the wiring of the power supply system and the signal system can be laid is extremely limited in doors and back doors, etc., and if the multiplex system is applied by applying the LIN system, the node portion where the signals are integrated becomes large. This is because it is difficult to secure the installation space. Regarding power supply systems, it is more difficult to respond to standardization and rationalization. The power supply system is provided with a line for supplying power separately for each load, and the rationalization has not progressed, such as a protection means being installed for each line.

    Once the fuse used for the protection means is blown by an overcurrent, the fuse must be replaced in order to start supplying power again. This has the disadvantage of not only costing parts but also labor. The IPS does not require parts replacement, but has a problem that the cost increases because the current sensor, the control unit, the driver, and the like are formed of semiconductors. Since the temperature of the PTC element decreases when the circuit is cut off and the current stops flowing, the resistance value decreases as the temperature decreases and the abnormal current flows again even if the failure location is not recovered.

  In the method disclosed in Japanese Patent Application Laid-Open No. 5-64361, when a plurality of load controllers are wired to two independent power supply lines, all load controllers are controlled regardless of the importance of the load. Therefore, it was necessary to interpose a backflow prevention diode. For this reason, a diode for preventing a backflow is required to supply power even to a less important load, which not only increases costs but also makes it difficult to secure installation space. In addition, when both power systems are grounded due to an accident or the like, there is a problem that power supply to all connected loads is stopped.

  In the method disclosed in Japanese Patent Application Laid-Open No. 10-262330, complex logic is used to identify a failure point. Therefore, even for a less important load, all loads connected to the feeder line are used. However, there is a problem that the same function is required.

    The present invention has been made in view of the above-described circumstances, and provides a protection means that can maintain an abnormality detection state until an abnormality cause is removed for an abnormal node, and a plurality of power supplies in an accident or the like. It is an object of the present invention to provide a vehicle power supply system in which some nodes can continue power supply normally even when a line is in a fault state such as a ground fault.

  According to a first aspect of the vehicle power supply system of the present invention, a plurality of power sources, a plurality of nodes each provided with a load controller for controlling an electric load disposed at various locations of the vehicle, and the plurality of systems A power supply system for a vehicle having a configuration in which each node is connected to the loop power supply line, the power supply system for a vehicle having a loop power supply line connected to each power supply system Each power supply system and the loop-shaped power line are connected to each other at a power line connecting part, and the loop-shaped power line has a circuit protection part between the power line connecting part and the node. It is the electric power feeding system for vehicles characterized.

  According to a second aspect, the circuit protection unit includes a circuit breaker having a self-recovery function, a contact connected in series to the circuit breaker, and the contact connected in parallel to the circuit breaker and the contact. And a contact holding means for opening and holding the vehicle.

  According to a third aspect, the circuit protection unit includes a circuit breaker having a self-recovery function, a first contact connected in series to the circuit breaker, and a downstream side of the circuit breaker. A backup power supply line for supplying power to the load side, a second contact provided on the backup power supply line, the circuit breaker and the contact connected in parallel to open and hold the first contact A vehicle power supply system comprising contact holding means for closing and holding the second contact.

  According to a fourth aspect of the vehicle power supply system, the circuit protection unit further includes an abnormality warning unit that notifies the circuit interruption unit that an abnormal current has occurred.

  According to a fifth aspect, the circuit protection unit further includes a return unit that returns the operation of the circuit protection unit to a state before the occurrence of the abnormal current after the cause of the abnormal current is removed. This is a vehicle power supply system.

  A sixth aspect is characterized in that the loop-shaped power supply line is formed with an open portion for each line on both sides across one or more adjacent nodes connected to the power supply line. This is a vehicle power supply system.

  In a seventh aspect, the power supply line in the section sandwiched between the open portions provided in each of the power supply lines is provided with a protection structure for protecting the power supply line from a fault such as a ground fault. It is the electric power feeding system for vehicles characterized by having.

  In an eighth aspect, for each of the nodes connected to the power line between an open part provided on one line of the power line and an open part provided on another line, While connecting the power supply line and each of the nodes together through the backflow prevention means, for each of the nodes connected to the power supply line from the power supply line connection portion to the open portion, The connection between the line having an open portion and each of the nodes is made through the backflow prevention means, and the connection to the other line having no open portion is made without going through the backflow prevention means. This is a vehicle power supply system.

  According to a ninth aspect, a communication system is configured by using a high-order controller instead of the plurality of power supplies, and using a loop signal line connected to the load controller of each node instead of the loop power line. A power supply system for a vehicle characterized by being applied to a circuit.

    According to the present invention, the loop-shaped power line side of the power line connecting portion, which is a connecting portion between each system of a plurality of power sources and the loop-shaped power line, specifically, the power line connecting portion and the above-mentioned By providing a circuit protection unit with the node, when the power supply line is disconnected due to an accident, etc., power is continuously supplied to the power supply line that has no ground fault in the section from the disconnected part to the circuit protection unit. There is an excellent effect.

  Furthermore, according to the present invention, there is no need to replace parts even when the circuit protection unit is activated by using a circuit breaker having a self-recovery function in the circuit protection unit. It is possible to maintain this state, and there is an excellent effect that unnecessary discharge of the battery or the like can be prevented. Further, since inexpensive parts such as relays and PTC elements are used and the logic of the protection function is simple, it can be realized at low cost.

  Furthermore, according to the present invention, there is an excellent effect that the power supply from the backup power supply line to the load is continued even when the circuit protection unit is activated due to the ground fault of the power supply line due to the addition of the backup power supply line.

  Further, according to the present invention, the installation of the abnormality warning means and the installation of the return means have an excellent effect that the driver can quickly grasp the abnormality and can quickly return to the normal state after removing the cause of the abnormality.

  Furthermore, according to the present invention, by providing the open portion in the power supply line, there is an excellent effect that power can be continuously supplied to some loads even when a plurality of lines are grounded. In particular, a node connected to a power supply line sandwiched between multiple open sections can always supply power regardless of the ground fault position of the power supply line, so assign a load with important functions to the node. Thus, it becomes possible to further improve the stability of the system.

  Furthermore, according to the present invention, by providing the protection structure to the power supply line in the section sandwiched between the open portions, the power supply to the node connected to the section becomes more reliable. Therefore, by connecting a load having an important function to the section, the stability of the system can be dramatically improved.

  Furthermore, according to the present invention, for a node connected to a power supply line other than the section sandwiched between the open portions, not only the cost reduction can be achieved by omitting the installation of the backflow prevention means, but also the installation space is reduced. There is an excellent effect that can be done.

  Furthermore, according to the present invention, it is easy to apply not only to a power supply system but also to a communication system, and a highly reliable communication system can be realized.

Embodiments of a vehicle power supply system according to the present invention will be described with reference to the accompanying drawings.
According to a first aspect of the vehicle power supply system of the present invention, a plurality of power sources, a plurality of nodes each provided with a load controller for controlling an electric load disposed at various locations of the vehicle, and the plurality of systems A power supply system for a vehicle having a configuration in which each node is connected to the loop power supply line, the power supply system for a vehicle having a loop power supply line connected to each power supply system Each power supply system and the loop-shaped power line are connected to each other at a power line connecting part, and the loop-shaped power line has a circuit protection part between the power line connecting part and the node. It is the electric power feeding system for vehicles characterized.

    FIG. 1 is a diagram illustrating an example of the overall configuration of the first aspect of the vehicle power supply system of the present invention. The power supply device 1 includes two power sources 2 and 3. The two power supply lines 4 and 5 are power lines formed in a loop shape, and are connected to the power supplies 2 and 3, respectively. Further, circuit protection units 8A, 9A, 8B, and 9B are disposed before and after the power supply line connecting portions 6 and 7 of the power supplies 2 and 3 and the power supply lines 4 and 5, respectively. A plurality of nodes 11a, 11b, 11c, and 11d, each having a load controller 10 for controlling an electrical load disposed in various parts of the vehicle, are connected to a power line 4 through a diode 12 as a backflow prevention unit, respectively. 5 is connected.

  The operation of the vehicle power supply system configured as described above will be described below. When one of the power supply lines has a ground fault at the point 13 (ground fault point) in FIG. 1, the circuit protection unit connected to the grounded power supply line is activated to stop power supply to the power supply line. . For example, when the power supply line 4 is grounded, the circuit protection units 8A and 9A are activated, and power supply to the power supply line 4 is stopped. Up to this point, it is almost the same as a known vehicle power supply system.

  Here, a case is considered where both power lines are disconnected at 14 points (open points) due to an accident or the like and opened. In this case, the node 11a is fed via the circuit protection units 8A and 8B, while the nodes 11b, 11c and 11d are fed via the circuit protection units 9A and 9B. In this state, for example, when the power supply lines 4 and 5 are grounded at the ground fault point 13 in FIG. 1, both the circuit protection units 8A and 8B are activated, the power supply to the node 11a is stopped, and the node 11a Although the controlled load can no longer operate, the power supply to the nodes 11b, 11c, and 11d is continued, and the load controlled by the nodes 11b, 11c, and 11d can operate normally.

  As described in the first aspect above, by providing the circuit protection unit between the power supply line connection unit and the node, there is a ground fault in some power supply lines in a state where the power supply line is disconnected. However, there is an excellent effect that power is continuously supplied to the power line in the section where there is no ground fault.

  According to a second aspect of the vehicle power supply system of the present invention, in the circuit protection unit, a circuit breaker having a self-recovery function, a contact connected in series to the circuit breaker, the circuit breaker, and the contact And a contact holding means connected in parallel to open and hold the contact.

  FIG. 2 is a diagram for explaining a second aspect of the present invention. In FIG. 2, 20 is a circuit protection part and 21 is a power supply device. The circuit protection unit 20 in FIG. 2 is a specific example of the circuit protection units 8A, 8B, 9A, and 9B in FIG. Reference numeral 22 denotes a circuit breaker. In the following description, an example using a PTC element will be described, but a circuit breaker using a bimetal or the like may be used. The PTC element 22 has a unique positive temperature characteristic, and when the temperature of the PTC element 22 rises due to an excessive current or the like, the resistance value of the PTC element 22 rapidly increases and the current hardly flows. Further, when the temperature is lowered, the resistance value returns to the original low value again, and the current flows, so that the current flows. In the present invention, the PTC element 22 having such a positive temperature characteristic is applied to the circuit protection unit 20 and further improved. An example of the positive temperature characteristic of the PTC element 22 is shown in FIG. FIG. 3 shows that the resistance value increases rapidly as the temperature rises.

  The contact 23 is connected to the PTC element 22 in series and is normally kept closed. A power line 24 that supplies power to the load is connected to the contact 23. The contact holding means 25 is connected in parallel to the PTC element 22 and the contact 23, and includes two relay excitation units 26 and 27 and two contacts 28 and 29. The contact holding means 25 drives the contact 23 to an open state when a ground fault occurs in the power line 24. The contacts 28 and 29 are controlled by the relay exciter 26 and are normally kept open.

  The operation of the circuit protection unit 20 configured as described above will be described below. When a ground fault occurs in the power supply line 24, an excessive current flows through the PTC element 22, and a voltage is applied to both ends of the relay excitation unit 26 provided in the contact holding means 25. In operation, the contacts 28 and 29 are driven to the closed state. At the same time, the temperature of the PTC element 22 rises due to an excessive current. When the temperature of the PTC element 22 rises, the resistance of the PTC element 22 rapidly increases due to its own temperature characteristics, and the current flowing through the PTC element 22 decreases rapidly. In addition, when the contacts 28 and 29 are closed, the relay excitation unit 27 is excited, whereby the contact 23 is opened and power supply to the power supply line 24 is stopped. When the contacts 28 and 29 are closed, the excitation of the relay exciters 26 and 27 is maintained.

  According to a third aspect of the vehicle power supply system of the present invention, in the circuit protection unit, a circuit breaker having a self-recovery function, a first contact connected in series to the circuit breaker, and the circuit breaker A backup power supply line for branching on the downstream side of the power supply to supply power to the load side, a second contact provided on the backup power supply line, the circuit interrupting means and the contact connected in parallel to the first And a contact holding means for closing and holding the second contact, and a vehicle power supply system.

  FIG. 4 is a diagram for explaining a third aspect of the present invention. In the third mode, a backup power supply line is added to the circuit protection unit 20 of FIG. 2 described in the second mode. In FIG. 4, a second contact 31 and a backup power supply line 32 are added by branching from between the PTC element 22 and the first contact 23. The added second contact 31 is normally kept open.

  The operation of the circuit protection unit 20 of the present invention shown in FIG. 4 is as follows. When a ground fault occurs in the power supply line 24, an excessive current flows through the PTC element 22, and a voltage is applied to both ends of the relay excitation unit 26 provided in the contact holding means 25. It is the same as the second mode described with reference to FIG. 2 that the contacts 28 and 29 are actuated to be driven and the relay exciter 27 is further excited. In the third mode, when the relay exciter 27 is excited, in addition to driving the first contact 23 to the open state, the second contact 31 is driven to the closed state. As a result, power supply to the power supply line 24 is stopped, while power supply to the backup power supply line 32 is started.

  In the third aspect, even when the power supply line 24 becomes unable to supply power to the load 30 due to the ground fault or the like due to the addition of the backup power supply line 32, the load 30 is normal due to the start of power supply from the backup power supply line 32. Operation is possible. Further, when an abnormal current flows through the backup power supply line 32, the PTC element 22 stops passing current due to a temperature rise due to overcurrent, and power supply to the load is completely stopped. Therefore, a situation where power supply is continued from the backup power supply line 32 in an abnormal state is avoided.

  According to a fourth aspect of the vehicle power supply system of the present invention, there is provided a vehicle power supply system characterized in that an abnormality warning means for notifying the circuit interruption means that an abnormal current has occurred is added to the circuit protection unit.

  FIG. 5 is a diagram for explaining a fourth aspect of the present invention. In the fourth aspect, an abnormality warning lamp 33 as an abnormality warning means is added to the circuit protection unit of FIG. 2 described in the second aspect. The abnormality warning means 33 is not limited to the abnormality warning light, and may be a buzzer or the like. As described in the second embodiment, when the potential difference between the front and rear of the PTC element 22 is increased by an abnormal current due to a ground fault of the power supply line 24, the relay excitation unit 26 is excited. It is a thing. As a result, the driver can quickly know the abnormality of the power line 24.

  According to a fifth aspect of the vehicle power supply system of the present invention, the circuit protection unit includes return means for returning the operation of the circuit protection unit to the state before the occurrence of the abnormal current after the cause of the abnormal current is removed. A power supply system for a vehicle characterized by being added.

  FIG. 6 is a diagram for explaining a fifth aspect of the present invention. In the fifth mode, a return switch 34 is added to the circuit protection unit of FIG. 2 described in the second mode as a return means for returning the operation of the circuit protection unit to the state before the occurrence of the abnormal current. . After the cause of the abnormality is removed, a return switch 34 is added to the contact holding means 25 as means for returning the contact 23 to the closed state again and restarting power supply to the power supply line 24. The return switch 34 is provided at the ground portion of the contacts 28 and 29 in the contact holding means 25. When the return switch 34 is not grounded, the excitation of the relays 26 and 27 is stopped, and as a result, the contact 23 returns to the closed state. . Since the temperature of the PTC element 22 decreases while the power supply is stopped and the resistance value is restored to the original low value, the power supply to the power supply line 24 resumes at the same time as the contact 23 returns to the closed state. Is done.

  According to a sixth aspect of the vehicle power supply system of the present invention, in the loop-shaped power supply line, an open portion is formed on each side of each line across one or more adjacent nodes connected to the power supply line. It is the electric power feeding system for vehicles characterized by being characterized.

  FIG. 7 is a diagram for explaining a sixth aspect of the present invention. Although the power supply lines 4 and 5 are formed in a loop shape, one open portion 17 and 18 is provided for each. That is, in the sixth mode, the power supply line 4 is opened between the node 11b and the node 11c with the node 11c interposed therebetween, and the power supply line 5 is opened between the node 11c and the node 11d. A connection example of the node 11c sandwiched between the open portions 17 and 18 is shown in FIG. In FIG. 8, power supply lines 4 (4A, 4B) and 5 (5A, 5B) are arranged using an FFC 41, and the power supply lines 4 and 5 and the node 11c are connected by piercings 42 and 43. . The power supply line 4 has an open portion 44 on the left side of the connection part by the piercing 42 (side connected to the circuit protection parts 8A and 8B), and the power supply line 5 has the right side of the connection part by the piercing 43 (circuit protection part 9A, 9B has an opening 45 on the side connected to 9B. By using FFC for the power supply lines 4 and 5, the open portions 44 and 45 can be easily formed by punching or the like. 8 corresponds to the opening portion 17 in FIG. 7, and the opening portion 45 in FIG. 8 corresponds to the opening portion 18 in FIG.

  The operation of the vehicle power supply system configured as described above will be described below. If the power supply lines 4A and 5A have a ground fault at 15 points due to a vehicle accident or the like, both the circuit protection units 8A and 8B are activated and the power supply in the direction of the ground fault point 15 is cut off. As a result, power supply to the nodes 11a and 11b is stopped for both lines, and both the loads controlled by the nodes 11a and 11b become inoperable. On the other hand, in the case of the present embodiment where the ground fault occurs at the ground fault point 15, the circuit protection units 9A and 9B do not operate, and thus the power supply to the node 11d is continued. In the node 11c, the power feeding from the power source 3 via the power line 5B is stopped due to the operation of the circuit protection unit 8B, but the power feeding from the power source 2 via the power line 4B is continued. . As a result, since power supply to the nodes 11c and 11d is continued, both the loads controlled by the nodes 11c and 11d can operate.

  In the sixth aspect, the case where a ground fault occurs at the ground fault point 15 located between the node 11a and the node 11b has been described, but the same applies when a ground fault occurs between the circuit protection units 8A and 8B and the node 11a. It is.

  In contrast to the sixth aspect described above, when the circuit protection units 9A and 9B are activated due to a ground fault between the circuit protection units 9A and 9B and the node 11d, the power supply to the node 11d is stopped. . On the other hand, in the node 11c, power feeding from the power source 2 via the power source line 4B is stopped due to the operation of the circuit protection unit 9A, but power feeding from the power source 3 via the power source line 5A is continued. .

  As described in the sixth aspect above, according to the vehicle power supply system of the present invention, even when the circuit protection unit is activated due to a ground fault at any part of the power supply line, all loads are loaded. However, the power supply to some of the loads is continued. In particular, for a node sandwiched between open portions provided for each of two power supply lines, power supply is maintained even when both lines are grounded at an arbitrary position of the power supply line. . Therefore, for example, by assigning a load having an important function to a node sandwiched between open parts, the stability of the system can be greatly improved.

  Needless to say, when only one of the two power supply lines is stopped, power supply to all nodes is ensured.

  According to a seventh aspect of the vehicle power supply system of the present invention, a power supply line in a section sandwiched between open portions provided in each power supply line has a protective structure for protecting the power supply line from a fault such as a ground fault. Is a power supply system for a vehicle.

  A seventh aspect will be described with reference to FIG. In the sixth aspect, only one node is sandwiched between the open portions provided in each of the two power supply lines. On the other hand, in this embodiment of FIG. 9, two nodes 11b and 11c are connected to the power supply line in the section sandwiched between the open portions 17 and 18. In this case, if the circuit protection unit is activated due to a ground fault in any part other than the section sandwiched between the open sections 17 and 18, both nodes in the section sandwiched between the open sections 17 and 18 are activated. The power supply is maintained in the same manner as in the sixth and seventh aspects. On the other hand, when both the lines are grounded between the node 11b and the node 11c in the section sandwiched between the open portions 17 and 18, the power supply to both the nodes 11b and 11c is stopped.

  Therefore, in the seventh aspect, the protective structure 16 is attached to the section sandwiched between the open portions 17 and 18, thereby avoiding a fault such as a ground fault in the section. The protective structure 16 is configured by, for example, a cover or tube made of an insulating material. This makes it possible to greatly improve the stability of the system by assigning two types of loads having important functions to the section sandwiched between the open portions 17 and 18. It goes without saying that the effect according to the seventh aspect is similarly achieved even when there are three or more nodes in the section sandwiched between the open portions, for example.

  According to an eighth aspect of the vehicle power supply system of the present invention, each node connected to the power line between the open part provided on one line of the power line and the open part provided on the other line is provided. On the other hand, the connection between the power line and each node is performed through the backflow prevention means, while the open part is connected to each node connected to the power line between the power line connecting part and the open part. The vehicle power supply system is characterized in that the connection between the line having the line and each node is made through the backflow prevention means and the connection to the other line without the open portion is made without going through the backflow prevention means. is there.

  The eighth aspect of the present invention will be described with reference to FIG. The node 11c sandwiched between the open portions 17 and 18 provided in the two power supply lines 4 (4A and 4B) and 5 (5A and 5B) is connected to the power supply lines 4B and 5A as in the sixth embodiment. Are connected through a diode 12 as a backflow prevention means. On the other hand, for the nodes 11a and 11b connected between the power line connecting sections 6 and 7 and the first open section 17 of the power line counterclockwise, the line 4A having the open section 17 and each node Is connected via the diode 12, while the connection between the other line 5 </ b> A and each node is made not via the diode 12.

  Similarly, for the node 11d connected between the power source and power line connecting portions 6 and 7 and the first open portion 18 of the power line clockwise, the line 5B and the node having the open portion 18 are connected. 11d is connected via the diode 12, while the other line 4B is connected to the node 11d without the diode 12.

  In the vehicle power supply system of the eighth aspect configured as described above, the number of diodes 12 is significantly reduced as compared with the sixth aspect. For example, the number is reduced from 8 in the sixth mode (FIG. 7) to 5 in the eighth mode (FIG. 10). In the eighth aspect, the operation when both lines are grounded at an arbitrary position of the power supply line is the same operation as in the sixth aspect, and the line to which the load is connected without using a diode is grounded. In the case of a ground fault of only one line, the operation is the same as when both lines are grounded. However, since the number of diodes can be greatly reduced, not only the cost can be reduced, but also the installation space is greatly reduced, which is a great advantage as a vehicle power supply system with a limited installation space.

  According to a ninth aspect of the vehicle power supply system of the present invention, a high-order controller is used instead of a plurality of power supplies, and a loop-like signal line connected to the load controller of each node is used instead of the loop-like power line. By doing so, the vehicle power supply system is applied to a communication system circuit. In the above first to eighth aspects, the power supply line for supplying power to the load has been described. However, the vehicle power supply system of the present invention can be similarly applied to a communication system circuit.

  The ninth aspect will be described with reference to FIG. FIG. 11 shows an example of a communication system circuit in the node 11, and 19 is a communication unit connected to the communication line. The communication unit 19 includes a transmission unit and a reception unit (both not shown). The transmission unit changes the communication line to a voltage level corresponding to the logic of the transmission signal. Specifically, a transistor circuit is used. The receiving unit reads the logic of the signal from the voltage level of the communication line. Specifically, it is configured by using a comparator circuit.

  In addition, the description in this Embodiment shows an example of the electric power feeding system for vehicles which concerns on this invention, and is not limited to this. The detailed configuration and detailed operation of the vehicle power supply system in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

FIG. 1 is a diagram illustrating the overall configuration of a vehicle power supply system according to the present invention. FIG. 2 is a diagram illustrating the configuration of the circuit protection unit of the present invention. FIG. 3 is a diagram showing temperature characteristics of the PTC element. FIG. 4 is a diagram showing a configuration in which a backup power supply line is added to the circuit protection unit of the present invention. FIG. 5 is a diagram showing a configuration in which an abnormality warning lamp is added to the circuit protection unit of the present invention. FIG. 6 is a diagram showing a configuration in which a return switch for returning to a state before occurrence of an abnormal current is added to the circuit protection unit of the present invention. FIG. 7 is a diagram for explaining the operation of the vehicle power supply system provided with the opening portion of the present invention. FIG. 8 is a diagram illustrating an example of a method for creating an open portion in a power supply line. FIG. 9 is a diagram showing an example in which a protective structure is added to the vehicle power supply system provided with the opening portion of the present invention. FIG. 10 is a diagram for explaining the operation when the number of diodes is reduced in the connection between the power supply line and the node in the vehicle power supply system provided with the open portion of the present invention. FIG. 11 is a diagram illustrating an example of a node when the vehicular power feeding system of the present invention is applied to a communication system circuit.

Explanation of symbols

1, 21 ... Power supply device 2, 3 ... Power supply 4, 5, 24 ... Power supply line 6, 7 ... Power supply line connection part 8 A, 8 B, 9 A, 9 B ... Circuit protection part 10 ..Load controllers 11a, 11b, 11c, 11d ... Node 12 ... Diode 13 ... Ground fault point 14 ... Opening point 15 ... Ground fault point 16 ... Protection structures 17, 18 ... Opening part 19 ... Communication part 22 ... PTC elements 23, 28, 29, 31 ... Contact 25 ... Contact holding means 26, 27 ... Relay excitation part 30 ... Load 32 ... Backup power line 33 ... Warning lamp 34 ... Return switch 41 ... FFC
42, 43 ... Piercing 44, 45 ... Opening

Claims (9)

A plurality of power sources, a plurality of nodes each provided with a load controller for controlling an electrical load disposed at various locations of the vehicle, and a loop power source connected to each of the plurality of power sources A vehicle power supply system having a configuration in which each node is connected to the loop-shaped power supply line,
Each system of the plurality of power sources and the loop power supply line are connected at a power supply line connecting portion, and the loop power supply line has a circuit protection portion between the power supply line connecting portion and the node. A vehicle power supply system comprising: The circuit protection unit includes a circuit breaker having a self-recovery function, a contact connected in series to the circuit breaker, and a circuit connected to the circuit breaker and the contact in parallel to open and hold the contact. The vehicle power supply system according to claim 1, further comprising a contact holding unit. The circuit protection unit includes a circuit breaker having a self-recovery function, a first contact connected in series to the circuit breaker, and a branch on the downstream side of the circuit breaker to supply power to the load side. A backup power supply line, a second contact provided on the backup power supply line, the circuit breaker and the contact connected in parallel to open and hold the first contact, and the second contact The vehicle power supply system according to claim 1, further comprising contact holding means for closing and holding. 4. The vehicle power supply system according to claim 2, wherein the circuit protection unit further includes an abnormality warning unit that notifies the circuit interruption unit that an abnormal current has occurred. 3. The circuit protection unit according to claim 2, further comprising a return unit configured to return the operation of the circuit protection unit to a state before the generation of the abnormal current after the cause of the generation of the abnormal current is removed. Item 4. The vehicle power supply system according to Item 3. 2. The loop-shaped power supply line is formed with an open portion for each line on both sides across one or more adjacent nodes connected to the power supply line. Vehicle power supply system. The power supply line in a section sandwiched between the open portions provided in each of the power supply lines is provided with a protection structure for protecting the power supply line from a failure such as a ground fault. The vehicle power supply system according to claim 6. For each node connected to the power line between an open part provided on one line of the power line and an open part provided on another line, the power line and each node Are connected via the backflow prevention means, while each node connected to the power supply line between the power supply line connecting portion and the open portion is connected to the line having the open portion. 7. The connection to each of the nodes is made through the backflow prevention means, and the connection to the other line having no open portion is made without going through the backflow prevention means. 8. The vehicle power supply system according to 7. It is applied to a communication system circuit by using a high-order controller instead of the plurality of power supplies, and using a loop signal line connected to the load controller of each node instead of the loop power line. The vehicle power supply system according to claim 1, claim 6, or claim 7.

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