JPH08258622A - Load current detecting device for vehicle - Google Patents

Abstract

PURPOSE: To provide a load current detecting device for vehicle which can protect electronic parts constituting a sensor circuit against the heat generated from a sensor resistance. CONSTITUTION: A load current detecting device concerned comprises an insulative plate 1 where a conductor bar 2 having a detecting resistance R is installed, a terminal part 3 installed in a single piece with one end of the conductor bar 2 for connecting of a car on-board power supply 10, another terminal part 4 installed at the other end of the bar 2 for connection of a load 8, a circuit board 5 which is installed opposing to the insulative plate 1 at certain spacing and includes a detecting circuit 6 to detect voltage drop of the detecting resistance R, and two terminals 7 for detecting of voltage drop where the detecting resistance R of the bar 2 and the detecting circuit 6 are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle load current detecting device for detecting a current flowing through a lamp of a vehicle or other electric loads.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional load current detecting device for a vehicle, in which 20 is a substrate, which is a detecting resistor 2.
1 and wiring patterns 22 and 23 on both ends thereof, respectively.
A plurality of terminal portions 24, 25 individually connected via
And a detection circuit 26 for detecting the voltage drop of the detection resistor 21.

An on-vehicle power supply 27 is connected to one of these terminal portions 24 and 25 through a fuse 28 and a main switch 29, and a load 30 such as a lamp is connected to the other, and the main switch 29 is turned on. By doing so, the in-vehicle power source 27 is connected to the fuse 28 and the main switch 2
9, terminal portion 24, wiring pattern 22, detection resistor 21,
Load 30 via wiring pattern 23 and terminal portion 25
To the load 30 by detecting the voltage drop of the detection resistor 21 with the detection circuit 26 while supplying a current to
When a failure such as a disconnection or short circuit occurs in the driver, the indicator (not shown) provided in the driver's seat is turned on to load the driver with a load 3
It is used in a load abnormality monitoring device that reports 0 failure.

[0004]

However, in the above conventional load current detecting device for a vehicle, since the detecting resistor 21 and the detecting circuit 26 are mounted on the same substrate 20, the detecting resistor is The heat generated at 21 is transferred to the electronic components forming the detection circuit 26 via the substrate 20, and there is a disadvantage that the electronic components are thermally adversely affected.

Therefore, the present invention is intended to provide a vehicle load current detection device capable of protecting the electronic components constituting the detection circuit from the heat generated in the detection resistor.

[0006]

According to a first aspect of the present invention, there is provided an insulating plate having a conductor bar having a detection resistance, and a terminal portion integrally provided at one end of the conductor bar for connecting a vehicle-mounted power source. A circuit having a terminal portion integrally provided for connecting a load to the other end of the conductor bar, and a detection circuit arranged to face the insulating plate at a predetermined interval to detect a voltage drop corresponding to a detection resistance. It is characterized in that it is provided with a substrate and a terminal for voltage drop detection which connects the detection resistance component of the conductor bar and the detection circuit.

According to a second aspect of the present invention, one of the terminal portions provided at both ends of the conductor bar according to the first aspect is a male connector and the other is a female connector.

According to a third aspect of the present invention, a plurality of short-circuit connecting portions for adjusting the resistance value are provided in the detected resistance portion of the conductor bar according to the first and second aspects, and two of the short-circuit connecting portions are connected. The feature is that they are selected according to the current flowing through the load and connected by a short pin.

According to a fourth aspect of the present invention, a plurality of connecting portions are provided for the detecting resistance of the conductor bar according to the first and second aspects, and two of these connecting portions are provided in accordance with the current flowing through the load. It is characterized in that it is selected and connected to a detection circuit at a terminal for detecting a voltage drop.

[0010]

According to the present invention, the in-vehicle power source is connected to the terminal portion at one end of the conductor bar, the load is connected to the terminal portion at the other end of the conductor bar, and the current is passed from the in-vehicle power source through the conductor bar. When the detection circuit detects the voltage drop of the detection resistance of the conductor bar, the circuit board with the detection circuit is placed at a certain distance from the insulating plate on which the conductor bar is placed, so that the detection resistance It is possible to prevent the heat generated in (3) from being transferred to the circuit board and the detection circuit, and protect the electronic components forming the detection circuit.

According to the present invention, the female and male connectors formed on the terminal portion of the conductor bar are connected to the female and male connectors provided in the harness for connecting the vehicle-mounted power source and the load, thereby detecting the load current in the vehicle. The abnormality monitoring function used in the device can be easily attached.

According to the present invention, the resistance value of the detection resistance is adjusted by selecting and connecting two of the plurality of short-circuit connecting portions with the short pin according to the current flowing through the load. A constant voltage drop can be obtained.

According to the fourth aspect of the present invention, the detection according to the current flowing through the load is performed by selecting the plurality of connecting portions according to the current flowing through the two loads and connecting the terminals for detecting the voltage drop to the detection circuit. The adjustment of the resistance value of the resistance component and the connection with the detection circuit of the detection resistance component can be performed at the same time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2, 1 is an insulating plate, 2 is a plurality of conductor bars integrally arranged on the upper surface of the insulating plate 1, and these conductor bars 2 have a detection resistance component R and will be described later. The same number as the number of loads 8 is provided.

Reference numeral 3 denotes a terminal portion integrally provided at each one end of the plurality of conductor bars 2, and these terminals are planted in a connector housing made of an insulating material to form a male connector 3a.

Numeral 4 is a terminal portion integrally provided at each of the other ends of the plurality of conductor bars 2, and these terminals are planted in a connector housing made of an insulating material to form a female connector 4a.

A circuit board 5 is disposed below the insulating plate 1 at a predetermined distance from the insulating plate 1 and has a detection circuit 6 for detecting the voltage drop of the detection resistance R. .

Reference numeral 7 denotes two terminals for detecting a voltage drop, and these terminals individually connect both ends of the detection resistance R of each conductor bar 2 to two input terminal portions 6a of the detection circuit 6 of the circuit board 4. ing.

Reference numeral 8 is a plurality of loads, 9 is a male connector having a terminal portion (not shown) individually wired at one end of each load 8, and 10 is an in-vehicle power source. One end of a plurality of fuses 12 corresponding to the load 8 is wired through the main switch 11, and the minus terminal is connected to the vehicle body 13 so that the other end of the load 8 is connected.

Reference numeral 14 is a female connector having a terminal portion (not shown) individually wired to the other end of the fuse 12.

Reference numeral 15 in FIG. 2 denotes a case in which the insulator 1 having the conductor bar 2 and the circuit board 5 having the detection circuit 6 connected to the insulator 1 are accommodated. The male and female connectors 3a and 4a are installed on the outer surface.

According to the structure of this embodiment, the male connector 3a provided at one end of the conductor bar 2 is fitted into the female connector 14 provided in the fuse 12 in order to detect the current flowing through each of the plurality of loads 8. In addition, the plurality of terminal portions 3 of the male connector 3a are individually connected to the plurality of terminal portions of the female connector 14, and the female connector 4a provided on the other end of the conductor bar 2 is attached to the load 8. The connector 9 is fitted to connect the plurality of terminal portions 4a of the female connector 4a to the male connector 9a.
Of the plurality of conductor bars 2 are individually connected to the terminal portion 3 provided at one end of each of the plurality of conductor bars 2, the vehicle-mounted power source 10 is connected to the main switch 11 and the plurality of fuses 1.
When the main switch 11 is turned on by connecting each of the plurality of loads 8 individually to the terminal portion 4 provided at the other end of each of the plurality of conductor bars 2, In-vehicle power supply 10 to main switch 1
1, a plurality of fuses 12, a female connector 14, a plurality of terminal portions 3, a plurality of conductor bars 2, a plurality of terminal portions 4 and a male connector 9 to be supplied to each of a plurality of loads 8 while a circuit board In the detection circuit 6 of 5, the voltage drop due to the detection resistance R of the conductor bar 2 can be detected via the terminal 7 and the input terminal portion 6a.

In particular, according to this embodiment, since the circuit board 5 having the detection circuit 6 is arranged at a predetermined distance from the insulating plate 1 having the detection resistance R, heat generated by the detection resistance R is generated in the circuit. It is possible to prevent transmission to the substrate 5 and the detection circuit 6 and protect the electronic components forming the detection circuit 6.

Further, by setting the thickness or length of each of the plurality of detection resistance components R according to the current flowing through the load 8 corresponding to each detection resistance component R, a constant voltage drop can be obtained. You can

A terminal portion 3 provided at one end of the conductor bar 2
As the male connector 3a and the terminal portion 4 provided at the other end of the conductor bar 2 is formed on the male connector 4a.
Connect the male connector 3a of the
And female connector 14 wired through fuse 12
By fitting the female connector 4a of the conductor bar 2 to the male connector 9 wired to the load 8.
The load current detection device can be easily connected between the harnesses that connect the load 8 to 0.

Further, by connecting the load current detecting device between the harnesses for connecting the load 8 to the vehicle-mounted power source 10, there is no abnormality monitoring function for notifying that the load 8 has a failure such as a disconnection or a short circuit. An abnormality monitoring function using the load current detection device can be easily attached to the vehicle.

In this embodiment, the thickness or length of the detection resistor R is set according to the current flowing through the load 8 to obtain a constant voltage drop, but the embodiment shown in FIG. The detection resistance component R and the insulator 1 are provided with holes 16 constituting a plurality of short-circuit connection portions for resistance value adjustment at equal intervals, and two of the holes 16 in each detection resistance component R are connected to each detection resistance component R. Is selected in accordance with the current flowing through the load 8 and connected by the short pin 17 so that a constant voltage drop is obtained.

According to this embodiment, a plurality of detection resistance components R
The thickness or the length of the detection resistance R can be formed in common regardless of the type of the load 8, and the resistance value of each detection resistance R can be adjusted according to the corresponding load 8.

Further, in the embodiment shown in FIG. 4, a plurality of detection resistance components R and holes 18 constituting a plurality of connection portions are provided in the insulator 1 at equal intervals, and two of these holes 18 are provided for each detection resistance component. R
Is selected according to the current flowing through the load 8 and is connected individually to the input terminal portion 6a of the detection circuit 6 at the terminal 7 for detecting the voltage drop.

According to this embodiment, the thickness or length of each detection resistor R is formed in common regardless of the type of the load 8.
By connecting the terminal 7 for detecting the voltage drop to the two holes 18 selected according to the current flowing through the load 8 corresponding to each detection resistor R and the input terminal portion 6a of the detection circuit 6, The adjustment of the resistance value of each detection resistance component R and the connection with the detection circuit 6 of each detection resistance component R can be performed at the same time.

In the embodiment shown in FIG. 3, the short connection portion is formed in the hole 16, and in the embodiment shown in FIG. 4, the connection portion is formed in the hole 18. Even if the portion or the connecting portion is formed by a projection and the short pin 17 or the terminal 7 is fitted and connected to this, the same effect can be obtained.

[0033]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect, the vehicle-mounted power source is connected to the terminal portion at one end of the conductor bar, the load is connected to the terminal portion at the other end of the conductor bar, and the current is passed from the vehicle-mounted power source through the conductor bar. In order to detect the voltage drop of the detection resistance of the conductor bar, the circuit board with the detection circuit is placed at a certain distance from the insulating plate where the conductor bar is placed, so that the heat generated by the detection resistance is generated. Can be prevented from being transmitted to the circuit board and the detection circuit, and the electronic components forming the detection circuit can be protected.

According to the second aspect of the present invention, the male and female connectors formed on the conductor bar are connected to the male and female connectors of the harness for connecting the on-vehicle power supply and the load, so that the abnormality monitoring function of the load current detecting device used in the vehicle is achieved. Can be easily attached.

According to the third aspect of the present invention, by detecting and connecting two of the plurality of short-circuit connecting portions provided for the detection resistance portion of the conductor bar with the short pin according to the current flowing through the load, A constant voltage drop can be obtained by adjusting the resistance value of the resistance component.

According to the fourth aspect, two of the plurality of connecting portions provided for the detecting resistance portion of the conductor bar are selected according to the current flowing through the load, and are connected to the detecting circuit at the terminal for detecting the voltage drop. As a result, it is possible to simultaneously adjust the resistance value of the detection resistance component according to the current flowing in the load and connect the detection resistance component to the detection circuit.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional vehicle load current detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation plate 2 Conductor bar 3 Terminal part 3a Male connector 4 Terminal part 4a Female connector 5 Circuit board 6 Detection circuit 7 Voltage drop detection terminal 8 Load 10 Vehicle-mounted power supply 16 Hole which constitutes short connection part 17 Short pin 18 Connection part Hole that composes

Claims (4)

[Claims] 1. An insulating plate in which a conductor bar having a detection resistance component is arranged, a terminal portion integrally provided at one end of the conductor bar for connecting an in-vehicle power source, and a load is connected to the other end of the conductor bar. Circuit board having a terminal portion integrally provided with the insulating plate, a circuit board having a detection circuit for detecting a voltage drop corresponding to the detection resistance, which is arranged relative to the insulating plate at a predetermined interval, and the detection resistance component of the conductor bar and the detection. A load current detection device for a vehicle, comprising: a terminal for voltage drop detection connected to a circuit. 2. The load current detection device for a vehicle according to claim 1, wherein one of the terminal portions provided at both ends of the conductor bar is formed as a male connector and the other is formed as a female connector. 3. A plurality of short-circuit connecting portions for adjusting the resistance value are provided for the detection resistance of the conductor bar, and two of these short-circuit connecting portions are selected according to the current flowing through the load and connected by a short pin. The load current detection device for a vehicle according to claim 1, wherein the load current detection device is for a vehicle. 4. A conductor bar is provided with a plurality of connecting portions for detecting resistance, and two of these connecting portions are selected according to a current flowing through a load and connected to a detecting circuit at a terminal for detecting a voltage drop. The load current detection device for a vehicle according to claim 1, wherein the load current detection device is for a vehicle.