JP2947860B2 - Power shut-off system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a power supply system, and more particularly, to a power supply system having a G sensor and a cutoff device, and detecting a shock degree and an acceleration of the system. , Shutting down the power system.

[Conventional technology]

Conventional protection of power supply or power supply system
As described in Japanese Patent No. 47819 and Japanese Patent Application Laid-Open No. 61-191231, regarding a system including a power supply, when a path such as a wire harness constituting the power supply is broken or broken due to a bite or the like, the path from the path is reduced. The system was designed to protect against development, such as possible short circuits. In these configurations, the system is protected under the condition that the components of the system such as the wiring are damaged and short-circuited, and a phenomenon occurs from the damage, and a secondary or tertiary process is performed until the protection is performed. There was a risk of damage. In addition, in such a detection method, in each case, it is considered that some electric stress is applied to the circuit,
The disadvantage was that it did not have active protection. In particular, it is considered that the system does not have an effective function from the viewpoint of performing protection before a short-circuit phenomenon occurs when the system itself receives an impact that is considered to cause damage.

[Problems to be solved by the invention]

In the prior art, in a power supply or a system having a power supply, protection is provided using a fuse or the like as protection in the event of an accident or failure.
No consideration is given to short-circuiting of the leads or cables when the system is damaged or damaged by impact, or short-circuiting of the power supply itself.Some power supply systems have two or more power supplies. There is a problem that the power supply system or the power supply mounted on the vehicle is in emergency, especially when the power supply system falls, falls or crashes, etc. There has been a problem that the safety of the power supply unit or the safety of the vehicle is not ensured.

An object of the present invention is to provide safety of a power supply or a power supply system by detecting the degree of impact or acceleration when a shock is applied to the power supply or the power supply system and shutting off the circuit breaker.

Another object of the present invention is to provide safety of a vehicle equipped with the power supply or the power supply system in an emergency, particularly in a collision.

[Means for solving the problem]

The present invention provides an impact degree detecting means for detecting an impact degree of a system, for example, a G sensor, a detection circuit for detecting a signal of the impact degree detecting means, and a detecting circuit for detecting a signal of the impact degree detecting means. And a circuit breaker for shutting off the power supply,
The circuit breaker cuts off only the high voltage power supply from the high voltage power supply and the low voltage power supply. The G breaker is
This shuts off the power when a signal of 20G or more continues for 50ms or more.

[Action]

With this configuration, when the power supply system or the vehicle equipped with the power supply system receives a collision or a similar impact, the power supply and the load can be cut off. Can be secured.

Also, the G sensor and the detection circuit are
Alternatively, the circuit breaker is operated when an impact or acceleration of 50 ms or more is applied at an acceleration of 20 G or more, thereby preventing malfunction in a state where simple vibration is applied.

Further, the circuit breaker connected in close proximity to the power supply can prevent a short circuit in a path from the power supply to the circuit breaker. This can prevent a short circuit in a conductor such as a body when the power supply system is mounted on a vehicle.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a basic system of a power cutoff system using a G sensor according to the present invention.

When the system receives a shock under the condition of use, the degree of the shock and the acceleration are detected by the G sensor 1 and transmitted to the detection circuit 2. The detection circuit 2 detects the level of the signal from the G sensor 1 and outputs an output signal for shutting off the circuit breaker 3 according to the input signal level. Circuit breaker 3
Is wired in close proximity to the power supply 4, the power supply 4 is wired to the circuit breaker 3, and the output from the load 5 and the output from the power supply 4 are connected to the vehicle body or a part of the case. G
The sensor 1 outputs a signal of an amount corresponding to the degree of impact and acceleration of the system, and transmits the signal to the detection circuit 2. The detection circuit 2 receiving the signal of the G sensor 2 determines the level of the signal, and outputs a signal for opening the circuit breaker contact 3A of the circuit breaker 3 when the impact degree and the acceleration are at a certain level or more. . The circuit breaker 3 outputs the breaker contact 3A based on the output signal of the detection circuit 2.
By opening the power supply, the path from the power supply 4 to the load 5 is cut off, whereby the power supply can be cut off in accordance with the degree of impact and acceleration, thereby ensuring safety.

FIG. 2 shows states of a G sensor output 1a, an output signal of the G sensor 1, a circuit breaker cutoff signal 2a output from the detection circuit 2, and a power supply output 4a in the basic system embodiment of FIG. It is. As shown in FIG. 2, the G sensor 1 outputs a G sensor output 1a, which is the degree of impact and acceleration of the system, as needed over time. The output G sensor output 1a is input to the detection circuit 2 and is discriminated. When the impact degree / acceleration level 7 is equal to or more than a certain value and the impact degree / acceleration time 8 is equal to or more than a certain value, the detection circuit 2 2 outputs a circuit breaker cutoff signal 2a. As a result, as shown in FIG. 2, the power supply output 4a is cut off, and serves to protect the system. Here, the cut-off signal 2a is output when the impact degree / acceleration level 7 is 20G or more in addition to the case where the impact degree / acceleration level 7 is equal to or more than a certain value and the impact degree / acceleration time 8 is equal to or more than a certain value. As described above, it is also possible to provide a system that performs protection under conditions close to a collision or the like where the impact degree and the acceleration time 8 are 50 ms or more. In addition, by setting the level, malfunction due to vibration or the like can be prevented.

FIG. 3 shows a first embodiment of a power cutoff system using a G sensor according to the present invention. The circuit breaker 9 connected to the power supply 4 is basically the same as the circuit breaker 3 in FIG.
Shall configure this system using a large power breaker. As the breaker 9, a breaker contact 9a that can be opened by an external input, which is equivalent to a general high-power breaker, is used. By using a high power breaker,
The power supply 4 can be large in size and high in voltage and can be incorporated in the system, and the safety at that time can be increased. In addition, the use of the external input type one-way circuit breaker can reduce the cost of the system itself and improve the reliability at the same time.

FIG. 4 shows a second embodiment of the power cutoff system using the G sensor according to the present invention. The present system is configured by using a relay for small power or a small signal for the circuit breaker 10 connected to the power supply 4. By using a relay for the circuit breaker 10, it is possible to protect a small power circuit or a small signal transmission system, and in the case of a system in which the load 5 has a built-in microcomputer, a serious failure of the system can be prevented. .

FIG. 5 shows a third embodiment of the power cutoff system using the G sensor according to the present invention. The power supply connected to the load 5 is a high voltage power supply 11 and a low voltage power supply 12. In addition, the path of the high-voltage power supply 11 is cut off as in the first embodiment. The load 5 is a two-sided load of the high-voltage power supply 11 and the low-voltage power supply 12, that is, a load of two power supplies, and the high-voltage power supply 11 and the low-voltage power supply 12 are insulated. is there. In this power supply system, when a shock or acceleration as seen in the G sensor output 1a in FIG. 2 is applied during the operation of the power supply system, the detection circuit 2a shuts off the circuit breaker 3 installed in the path of the high voltage power supply 11. Contact 3a
To release. Also, at this time, the low-voltage power supply 12 is not opened,
The route is being maintained. These are systems equipped with a microcomputer system and a power system circuit together, for example, a system such as a DC / DC converter or the like. Separation and insulation of 11 and low voltage power supply 12 can be maintained. In addition, even if the high voltage power supply 11 is cut off, the low voltage power supply 12
Thus, the system can be monitored, and functions such as reset at the time of recovery can be added.

FIG. 7 shows a fourth embodiment of the power cutoff system using the G sensor according to the present invention. In this embodiment, the load connected to the power supply 4 is an electric motor 14. In this embodiment, when the drive system is damaged, short-circuit between the power supply 4 and the electric motor 14 can be prevented, and runaway of an electric vehicle equipped with the electric motor 14 and the power supply 4 can be prevented.

〔The invention's effect〕

The present invention is configured as described above, and has the following effects.

FIG. 6 shows a circuit of a conventional power supply system for comparison. The power supply 4 automatically has a contact 13 when an overcurrent flows.
An overcurrent breaker 13 for opening a is connected, and the load 5 is connected to the overcurrent breaker 13 at the same time. The output 4a of the power supply and the output 5a of the load are grounded to a part of the vehicle body or the case. In this conventional product, when an impact force is applied, the output 4a, 4b of the power supply or the output 5a of the load 5 is broken,
The overcurrent breaker 13 is not interrupted until a short circuit occurs and an overcurrent flows. If the overcurrent breaker 13 is bypassed and short-circuited, the power supply 4 or the load 5 is considered to be damaged. The next factor was the tendency to protect the system from damage. These are protected by primary damage, for example, secondary protection before protection such as fusing is applied.
There was fear that the next damage would occur. According to the present invention, as shown in the basic system of FIG. 1, it is possible to cut off the power supply path before the primary damage is caused by the G sensor and prevent the secondary and tertiary damage. It becomes possible. In addition, the electrical stress applied to the circuit can be reduced in comparison with the method of shutting off by overcurrent. Further, when the motor as shown in FIG. 7 is included in the system, it is possible to prevent the drive system from running out of control due to a short circuit, or damage to the motor or power supply, which is assumed to occur secondary. As described above, in the present invention, active protection can be provided for protection of a power supply or a system including a power supply in the event of an accident.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a basic system of a power cutoff system using a G sensor according to the present invention, FIG. 2 is a diagram showing signals and states of respective paths in the system configuration of FIG. 1, and FIG. FIG. 4 is a schematic diagram showing a second embodiment of the present invention, FIG. 5 is a schematic diagram showing a third embodiment of the present invention, and FIG. FIG. 7 is a schematic diagram showing a typical power supply system, and FIG. 7 is a schematic diagram showing a fourth embodiment of the present invention. 1 ... G sensor, 2 ... detection circuit, 3 ... breaker, 4 ...
... power supply, 5 ... load, 4a ... G sensor output, 2a ... cutoff signal, 11 ... high voltage power supply, 12 ... low voltage power supply, 14 ... motor.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-55381 (JP, A) JP-A-58-22525 (JP, A) Fully open Showa 60-42221 (JP, U) Really open Showa 62- 129240 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02J 1/00 H01H 35/14

Claims (3)

(57) [Claims] An impact degree detecting means for detecting an impact degree of the system; a detecting circuit for detecting a signal of the impact degree detecting means; and a system when the detecting circuit detects a signal of the impact degree detecting means. A power cutoff system having a high voltage power supply and a low voltage power supply, wherein the circuit breaker only cuts off the high voltage power supply. 2. A G sensor for detecting the degree of impact of the system,
A power cutoff system comprising: a detection circuit for detecting a signal of the G sensor; and a circuit breaker for shutting off power to the system when the G sensor detects that a signal of 20 G or more has continued for 50 ms or more. 3. The power cutoff system according to claim 1, wherein said impact degree detection means, said detection circuit, and said circuit breaker are mounted on a vehicle.