JP2001187545A - Load driving control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load driving control device capable of driving/controlling the load by inputting an input signal from at least one input means such that a power is continuously supplied to at least one load or a power supply is continuously stopped or the power is intermittently supplied. SOLUTION: An intelligent fuse 2 of a head light driving control device 1 is provided between a battery power source B and a load (lamp 4a, etc.). When respective signals SS1-SS4 are inputted from respective switches 11-13, a judgment part H controls respective semiconductor relays TR1-TR4 to drive a load based on a combination of the respective signals SS1, etc. A signal such as a car speed sensor signal is inputted to the judgment part H other than the respective signals SS1, etc., and the judgment part H carries out a driving control based on a combination of the respective signals and the above respective signals SS1, etc., such that a power is intermittently supplied to the load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load drive control device.

[0002]

2. Description of the Related Art Conventionally, in an automobile, an abnormal current protection device such as a fuse is provided between a power supply and a load in order to protect a load such as a headlamp or a circuit element from an abnormal current flowing when a circuit is short-circuited. Is provided. An example of such an automotive fuse is a blade-type fuse of the type disclosed in U.S. Pat. No. 4,023,264. Blade type fuses are widely used in the electric system of automobiles, and in many cases, they have slow blow characteristics (the fuse does not blow due to an instantaneous abnormal current, but if the abnormal current continues to flow for a predetermined time or more, (The characteristic of fusing). Therefore, when a so-called dead short circuit in which a large current flows continuously on the circuit occurs, the load can be protected by blowing the blade type fuse.

FIG. 4 shows an example of a headlight driving device of an automobile having a blade type fuse. In the headlight driving device 31, when the light control switch unit 32 is set to the OFF mode, as shown in FIG. 4, the movable contact 33a of the head switch 33 is not connected to the fixed contact 33b, and the movable contact 34a of the changeover switch 34 is set to LO. The flash switch 3 is connected to one of the side fixed contact 34b and the HI side fixed contact 34c (34b in the figure).
5 movable contacts 35a are first and second fixed contacts 35b, 3
5c. Therefore, since no current flows through the coil 42 of the headlamp relay 41, the coil 42 is not excited and the headlight 5
1 lamps 52 and 53 and headlight 54 lamp 5
5, 56 do not light.

On the other hand, the light control switch section 32
Is set to the LO mode, the movable contact 33a
b, and the movable contact 34a is connected to the LO-side fixed contact 34b.
And the movable contact 35a is connected to the first and second fixed contacts 3
5b and 35c are not connected. Then, the coil 42 is excited and the first and second relay contacts 43 and 44 are excited.
The connection is conducted. Therefore, a current flows from the + terminal of the power supply to the LO side lamp 52 of the right headlight 51 via the first blade type fuse (hereinafter, referred to as a first fuse) 45, and the LO side lamp 52 is turned on. A current flows from the + terminal of the power supply to the LO side lamp 55 of the left headlight 54 via a second blade type fuse (hereinafter, referred to as a second fuse) 46, and the LO side lamp 55 is turned on.

When the light control switch section 32 is set to the HI mode, the movable contact 33a is set to the fixed contact 33b.
The movable contact 34a is connected to the HI-side fixed contact 34c, and the movable contact 35a is connected to the first and second fixed contacts 35c.
b, 35c. Then, the coil 42 is excited to conduct between the first and second relay contacts 43 and 44. Therefore, the HI side lamp 5 of the right headlight 51 is connected to the + terminal of the power supply via the first fuse 45.
3, a current flows to the HI lamp 53 of the left headlight 54 from the + terminal of the power supply through the second fuse 46, while the HI lamp 53 is turned on.
The HI lamp 56 is turned on.

Further, the light control switch unit 3
2 in the FLSH mode, the movable contact 33a is not connected to the fixed contact 33b, the movable contact 34a is connected to either the LO-side fixed contact 34b or the HI-side fixed contact 34c, and the movable contact 35a is connected to the first and second contacts. Fixed contacts 35b, 3
5c. Then, while the movable contact 35a is connected to the first fixed contact 35b, the coil 42 is excited and the first and second relay contacts 43 and 44 are conducted.
Therefore, a current flows from the + terminal of the power supply to the HI lamp 53 of the right headlight 51 via the first fuse 45, and the HI lamp 53 is turned on, and the second fuse 46 is connected from the + terminal of the power supply. Through the left headlight 5
4, the current flows through the HI-side lamp 56, and the HI-side lamp 5
6 lights up.

The movable contact 34a is fixed to the LO-side fixed contact 34.
b, while the movable contact 35a is connected to the first fixed contact 35b, the right headlight 5
1 LO side lamp 52 and left headlight 54 LO
A current also flows through the side lamp 55. Therefore, in this case, all lamps (52, 53, 55, 56) are turned on while the movable contact 35a is connected to the first fixed contact 35b.

For some reason, for example, when the connection between the first fuse 45 and the headlight 51 or between the second fuse 46 and the headlight 54 is conducted to the negative terminal of the power supply (dead short circuit). In (1), the first and second fuses 45 and 46 are blown, so that the electric wires and the like are protected.

[0009]

However, when a dead short circuit occurs in the headlight driving device 31, the first and second fuses 45 and 46, which are composed of blade-type fuses, are blown and blown. However, if a so-called rare short occurs in which an abnormal current flows intermittently instead of a dead short, the fuses 45 and 46 may not be blown. That is, in the case of a rare short, although the temperature of the blown portion of the fuse rises due to Joule heat caused by the intermittent abnormal current, the current flows only intermittently, and the temperature is reduced in a state where the blown portion does not melt. Will saturate. In such a case, an intermittent short-circuit current exceeding an allowable value flows through the electric wires and the like in the headlight driving device 31.

In the conventional headlight driving device 31, power is continuously supplied to the lamps 52 and the like or continuously based on the combination of the connection states of the switches 33 to 35. The drive of each lamp 52 and the like could be controlled only by stopping the supply of. That is,
Conventionally, each switch 33 to 3 is provided for each lamp 52 and the like.
5 can perform only simple on / off control based on the combination of the connection states of the switches 5 to D.
There is a demand for a headlight drive device that can perform drive control such as UTY control.

A first object of the present invention is to input an input signal from at least one input means, and to provide at least one input signal.
Provided is a load drive control device that can drive and control the loads such that power is continuously supplied to one load, power supply is continuously stopped, or power is supplied intermittently. It is in. It is a second object of the present invention to provide a load drive control device capable of protecting electric wires and the like in a device from an abnormal current of a rare short circuit or a dead short circuit when a rare short circuit or a dead short circuit occurs.

[0012]

According to a first aspect of the present invention, a power supply circuit is provided between a power supply circuit and at least one load driven by power supplied from the power supply circuit. An input signal is input from at least one input means, and power is continuously supplied to the load or power is continuously supplied to the load based on the one input signal or a combination of a plurality of input signals. The gist of the invention is to control the driving of the load so as to stop or supply power intermittently.

Therefore, according to the first aspect of the present invention, when an input signal is input from at least one input means, at least one load is continuously applied to at least one load based on the one input signal or a combination of a plurality of input signals. Power is supplied continuously, or the power supply is stopped continuously,
Alternatively, power is supplied intermittently, and the load is driven by the power.

According to a second aspect of the present invention, in the first aspect, the first load includes a drive permission signal for driving a load based on the one input signal or a combination of a plurality of input signals. An output unit that outputs a control signal; a current detection unit that is provided on a circuit through which a load current flowing through the load flows when the load is driven based on the drive permission signal, and that detects a current that flows through the circuit; Judge whether the current detected by the current detection means is abnormal,
Abnormality determining means for outputting a second load control signal including a drive inhibition signal for inhibiting the driving of the load based on the determination result; a first load control signal from the output means and the abnormality determining means And a driving means for driving a load based on the second load control signal from the control unit.

Therefore, according to the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, when the output means receives an input signal from at least one input means, the output means receives one input signal or a plurality of input signals. And outputs a first load control signal including a drive permission signal for driving the load, based on the combination of. Then, a current flowing in a circuit in which a load current flows in the load driven based on the drive permission signal is detected by the current detection unit. Then, the abnormality determining means determines whether or not the current detected by the current detecting means is abnormal, and when it is determined that the current is abnormal, a drive inhibition signal for inhibiting the drive of the load. Is output. Then, the driving of the load by the driving means is stopped based on the driving prohibition signal.

According to a third aspect of the present invention, in the second aspect of the invention, when the characteristic value of the current flowing through the circuit through which the load current flows is larger than a predetermined characteristic value, The gist is that the current is abnormal, that is, the current is determined to be a rare short or dead short abnormal current.

Therefore, according to the third aspect of the present invention, in addition to the operation of the second aspect of the present invention, the abnormality determining means determines that the current flowing through the circuit through which the load current flows is a rare short or dead short abnormal current. Then, the driving of the load by the driving means is stopped.

According to a fourth aspect of the present invention, in the second aspect, the current detecting means is a sensor having a fuse function. Therefore, claim 4
According to the present invention, in addition to the operation of the second aspect of the present invention, when the abnormality determining means does not operate normally for some reason, the abnormality determining means determines that the current flowing through the circuit through which the load current flows is abnormal. There is a possibility that the determination as to whether or not this is not performed. In such a case, when a dead short circuit occurs, the sensor having the fuse function is blown to cut off the circuit and stop driving the load.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the load is driven or stopped for each of a plurality of modes. Is for driving or stopping the load,
The gist is that the plurality of modes can be configured.

Therefore, according to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4,
When a plurality of modes are configured by the input means, the load is driven or stopped for each mode.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram showing an electric configuration of a headlight drive control device for turning on or off a headlight for an automobile. In FIG.
The intelligent fuse 2 of the headlight drive control device 1 is provided for the light control switch unit 3, the right headlight 4, and the left headlight 5.

The light control switch section 3 includes a plurality of switches (a head switch 11, a changeover switch 12, and a flash switch 13) having contacts whose allowable current value is smaller than that of the changeover switch 34 of the conventional example. The setting of the light control switch unit 3 can be changed to each of the OFF mode, LO mode, HI mode, and FLSH mode.

In the head switch 11, the movable contact 11a is grounded, and the fixed contact 11b is connected to an input terminal of a judgment unit H of the intelligent fuse 2 described later. The changeover switch 12 has the movable contact 12a grounded, and the LO-side fixed contact 12b and the HI-side fixed contact 12c connected to the input terminal of the determination unit H. Flash switch 13
The movable contact 13a is grounded, the first fixed contact 13b is connected to the input terminal of the determination unit H, and the second fixed contact 13c is connected to the HI-side fixed contact 12c of the changeover switch 12.

Between the fixed contact 11b and the input terminal of the judgment unit H, between the LO-side fixed contact 12b and the input terminal of the judgment unit H, and between the HI-side fixed contact 12c and the input terminal of the judgment unit H. Between the first fixed contact 13b and the input terminal of the determination unit H, electric wires WA to WD are provided. For the electric wires WA to WD, so-called signal lines, which are electric wires whose allowable current value is smaller than the electric wires W1 and W2 of the conventional example (both are power lines), are used.

When the light control switch unit 3 is set to the OFF mode, each switch 1
The connection states of the contacts 1 to 13 are as follows. That is, as shown in FIG. 1, the head switch 11 has the movable contact 11a opened to the fixed contact 11b. On the other hand, the changeover switch 12 has the movable contact 12a connected to either the LO-side fixed contact 12b or the HI-side fixed contact 12c. In FIG. 1, the movable contact 12a is LO
The state where it was connected to the side fixed contact 12b is illustrated.
The flash switch 13 has a movable contact 13 a
And the second fixed contact 13b, 13c.

On the other hand, when the setting of the light control switch unit 3 is changed to the LO mode, the movable contact 11a is connected to the fixed contact 11b, the movable contact 12a is connected to the LO-side fixed contact 12b, and the movable contact 13a is connected to the first contact. And the second fixed contacts 13b and 13c are not connected. or,
When the setting of the light control switch unit 3 is changed to the HI mode, the movable contact 11a is connected to the fixed contact 11b, the movable contact 12a is connected to the HI-side fixed contact 12c, and the movable contact 13a is connected to the first and second fixed contacts. 13b, 1
3c is not connected. Further, when the setting of the light control switch unit 3 is changed to the FLSH mode, the movable contact 11a is not connected to the fixed contact 11b, and the movable contact 12a is connected to either the LO-side fixed contact 12b or the HI-side fixed contact 12c. The movable contact 13a is the first
And the second fixed contact 13b, 13c.

The right headlight 4 includes a LO side lamp 4a and an HI side lamp 4b which are turned on at a predetermined brightness when driven by electricity (driven by power supplied from a power supply circuit). The LO side lamp 4a and the HI side lamp 4b have the same wattage, but by adjusting their optical axes, the HI side lamp 4b is brighter than the LO side lamp 4a. It is visible. One terminal of the LO side lamp 4a is connected to a first semiconductor relay TR1 of the intelligent fuse 2 described later, and the other terminal is grounded. One terminal of the HI-side lamp 4b is connected to the second semiconductor relay TR2, and the other terminal is grounded.

On the other hand, when energized, the left headlight 5 lights up at a predetermined brightness (driven by the electric power supplied from the power supply circuit).
b. LO side lamp 5a and HI side lamp 5
b, the wattage is the same, but by adjusting each optical axis, the HI side lamp 5
It looks like b is brightly lit. The LO-side lamp 5a and the LO-side lamp 4a have the same wattage, and appear to be lit with the same brightness. The HI-side lamp 5b and the HI-side lamp 4b have the same wattage and appear to be lit with the same brightness. One terminal of the LO-side lamp 5a is the third terminal.
The other terminal is connected to the ground, and is connected to the semiconductor relay TR3. One terminal of the HI-side lamp 5b is connected to the fourth semiconductor relay TR4, and the other terminal is grounded.

As shown in FIG. 2, an intelligent fuse 2 as a load drive control device is provided between a battery power supply B as a power supply circuit and a load (such as a lamp 4a). (In this embodiment, all are FETs) TR1 to TR4, first to fourth current sensors (in this embodiment, all sensors with a fuse function) F1
To F4, and a judgment unit H. The first current sensor F1 and the drain / source of the first semiconductor relay TR1 are connected in series between the + terminal of the battery power supply B and the LO-side lamp 4a, and between the + terminal and the HI-side lamp 4b. The drain and source of the second current sensor F2 and the second semiconductor relay TR2 are connected in series. The third current sensor F3 and the drain / source of the third semiconductor relay TR3 are connected in series between the + terminal and the LO-side lamp 5a, and the third current sensor F3 and the HI-side lamp 5b are connected between the + terminal and the HI-side lamp 5b. The drain of the fourth current sensor F4 and the fourth semiconductor relay TR4;
Sources are connected in series.

Both ends of each of the current sensors F1 to F4 (8 in total)
) Are respectively connected to the input terminals of the determination unit H. Gate of each semiconductor relay TR1 to TR4 (4 in total)
) Are respectively connected to the output terminals of the determination unit H. The judgment unit H is provided with a plurality of input / output terminals (four input terminals and one output terminal in this embodiment) in addition to the above-mentioned input / output terminals. In the present embodiment, an IG signal S1, a vehicle speed sensor signal S2, a door courtesy signal S3, and an illuminance sensor signal S4 are input to the four input terminals.
Are input (each constituting an input signal),
Further, a DIAG output signal S5 is output from the one output terminal.

The IG signal S1 is a signal input from an ignition (IG) switch (input means) (not shown). When the IG switch is turned on (when the engine is started), an ON signal (for example, H Level), and when the IG switch is turned off, the signal is turned off (for example, L level). The vehicle speed sensor signal S2 is a signal input from a vehicle speed sensor (input means) (not shown), and the signal level (voltage level) is determined according to the speed of the vehicle. The door courtesy signal S
Reference numeral 3 denotes a signal input from a courtesy switch (input means) (not shown). When the door is opened and the courtesy switch is turned off, an off signal (for example, L level) is output, and the door is closed and the courtesy switch is turned on. Then, an ON signal (for example, H level) is set.

The illuminance sensor signal S4 is a signal input from an unillustrated illuminance sensor (input means), and the signal level (voltage level) is determined according to the surrounding illuminance. The DIAG output signal S5 is output when the determination unit H determines that the characteristic value of the current flowing through the current sensor (such as the first current sensor F1) is larger than a predetermined characteristic value, or when the lamps 4a, 4b, This signal is output when current is not supplied to the lamp while current is to be supplied to any of 5a and 5b. In a state where current is to be supplied to any of the lamps 4a, 4b, 5a, and 5b, when no current is supplied to that lamp, it means a so-called disconnection or a broken ball.

As shown in FIG. 3, the judging section H as the output means and the abnormality judging means includes an IC 21 and a microcomputer 22. Actually, four current sensors (F1 to F4) and four semiconductor relays (TR1 to TR1) are provided for the determination unit H.
TR4), four loads (ramp 4a, 4b, 5a, 5
3B, one current sensor (F1), one semiconductor relay (TR1), and one load (lamp 4a) are provided for the determination unit H in FIG.
Only one is shown. Also, actually, three switches (switches 11 to 13) are provided for the determination unit H, but for convenience of description, one switch (switch 11) is provided for the determination unit H in FIG. Only one is shown. The IC 21 has a configuration including a known differential amplifier circuit including an OP amplifier, a known comparison circuit, and the like.

In FIG. 3, an IC 21 and a microcomputer 22
Are connected to the + terminal of the battery power supply B and the − terminal of the battery power supply B, respectively, and are activated when the power supply voltage is supplied from the battery power supply B. The current sensor input terminals of the IC 21 (eight in the present embodiment,
In the present embodiment, only two sensors are shown.
To F4, but only F1 is shown in FIG. 3). The relay output terminals of the IC 21 (four in this embodiment, but only one are shown in FIG. 3) are semiconductor relays (four in this embodiment, TR1 to TR4, but only TR1 is shown in FIG. 3). Connected to the gate. The IC 21 is connected to the microcomputer 22 via a plurality of input / output signal lines (in this embodiment, two input signal lines IS1, IS2 and two output signal lines OS1, OS2).

The microcomputer 22 has a plurality (4 in this embodiment).
In this embodiment, the four external signal input terminals are provided with input signals (HEAD signal SS1, HEAD signal SS1) from the switches 11 to 13.
LO signal SS2, HI signal SS3, FLSH signal SS
4) is input via electric wires WA to WD (only the electric wire WA is shown in FIG. 3).

The HEAD signal SS1 is an H-level off signal when the movable contact 11a of the head switch 11 is not connected to the fixed contact 11b, and is an L-level off signal when the movable contact 11a is connected to the fixed contact 11b. Is turned on. The LO signal SS2 is an L-level ON signal when the movable contact 12a of the changeover switch 12 is connected to the LO-side fixed contact 12b, and is H-level when the movable contact 12a is connected to the HI-side fixed contact 12c. Is turned off.

The HI signal SS3 is supplied to the switch 12
Is connected to the LO-side fixed contact 12b,
The movable contact 13a of the flash switch 13 is
When it is not connected to the fixed contact 13c, it is an H level off signal. Also, the HI signal SS3 is
When at least one of 2a is connected to the HI-side fixed contact 12c and / or the movable contact 13a is connected to the second fixed contact 13c, an L-level ON signal is output. The FLSH signal SS4 is an H level off signal when the movable contact 13a of the flash switch 13 is not connected to the first fixed contact 13b,
When the movable contact 13a is connected to the first fixed contact 13b, an L-level ON signal is output.

The microcomputer 22 has the above-mentioned signals SS1 to SS
4 (each constituting an input signal), based on a combination of the levels of the signals SS1 to SS4,
The mode (OFF mode or the like) of the light control switch unit 3 is determined, and a mode signal (first signal) corresponding to the mode is determined.
Load control signal) to the IC 21 via the input signal line IS1.
Output to The IC 21 turns on or off the lamps 4a, 4b, 5a, and 5b by controlling on / off of the first to fourth semiconductor relays TR1 to TR4 based on the mode signal, the energization permission signal, and the energization cutoff signal described later. (Drive control of the load).

When the lamps 4a, 4b, 5a and 5b are turned on, the current sensor (F
1), a drain / source of a semiconductor relay (TR1 or the like), and a lit lamp (4a or the like), and a load current flows to a negative terminal (shown by a ground symbol in FIG. 1) of the battery power source B.

When the load (the lamp 4a or the like) is energized and a current (for example, a current corresponding to the load current of the lamp 4a) flows through the current sensor (the first current sensor F1 or the like), the IC 21 outputs the current sensor itself. From the differential amplifier circuit as a detection signal. That is, the current flowing in the circuit through which the load current flows is detected by the first to fourth current sensors F1 to F4. The IC 21 outputs an output signal (H or L level voltage) indicating whether the detection signal (voltage) is greater than a predetermined voltage value (two different voltage values in this embodiment). The signals are output from the comparison circuits (two in the present embodiment) to the microcomputer 22 via the output signal lines OS1 and OS2.

The microcomputer 22 determines the current sensor (F1) based on the level of the output signal (two in this embodiment).
The current value of the current flowing in the current level range (in the present embodiment, the current level range is defined by the first current value and the second current value larger than the first current value). It is determined whether it belongs to. Then, the microcomputer 22 determines whether or not the characteristic value of the current is larger than a characteristic value predetermined for each current level range (whether or not the current detected by the current sensor is abnormal). . In the present embodiment, the characteristic value means that the current value of the current has exceeded the second current value for a continuous time in which the current value of the current flowing to the current sensor (F1 or the like) has exceeded the first current value. Continuous time, the ratio of the ON time per unit time of the current (ON DUTY
Ratio), the number of times that the current value of the current exceeds the second current value per unit time.

The microcomputer 22 determines that the characteristic value of the current is larger than a predetermined characteristic value (determination result).
And semiconductor relay (TR1 etc.) and load (lamp 4a etc.)
It is determined that an abnormal current of rare short or dead short may flow (the current is abnormal, that is, the current is an abnormal current of rare short or dead short). Then, the microcomputer 22 sends a cut-off signal to the IC 21 via the input signal line IS2 (a second load control signal, and a drive inhibition signal for inhibiting the drive of the load).
And outputs a DIAG output signal S5. Here, by resetting the IG signal S1, the abnormality determination is reset, and the microcomputer 22 outputs the energization permission signal to the IC 21 and stops the output of the DIAG output signal S5. However, if the abnormal current state continues even after the IG signal S1 is re-input, the microcomputer 22
Outputs the power cutoff signal to IC21 and
The output signal S5 is output.

On the other hand, when the microcomputer 22 determines that the characteristic value of the current is smaller than or equal to the preset characteristic value (determination result), an abnormal current such as a rare short circuit or a dead short circuit occurs in the semiconductor relay or the load. It is determined that there is no risk of flowing, and an energization permission signal (second load control signal) is output to the IC 21 via the input signal line IS2.

In the present embodiment, the right headlight 4 and the left headlight 5 each constitute a headlight,
LO side lamp 4a, HI side lamp 4b, LO side lamp 5
a and the HI-side lamp 5b constitute a load and a lamp, respectively. The head switch 11, the changeover switch 12, and the flash switch 13 constitute an input unit and a switch, respectively. The first to fourth current sensors F1 to F4 constitute current detection means and sensors having a fuse function, respectively. First to fourth semiconductor relays TR1 to TR4
Respectively constitute a driving means and a semiconductor relay.

Next, the operation of the headlight drive control device 1 configured as described above will be described. First, when the light control switch unit 3 is set to the OFF mode, the switch unit 3 sends the H level HEAD signal SS1 (off signal), the L level or the H level to the microcomputer 22.
Level LO signal SS2 (ON signal when L level, OFF signal when H level), HI signal SS3 at L level or H level (ON signal when L level, H signal when H level OFF signal), H level FLSH
The signal SS4 (off signal) is output. Then, the microcomputer 22 sets the light control switch unit 3 to O based on the combination of the levels of the signals SS1 to SS4.
It determines that the mode is the FF mode, and outputs an OFF mode signal (first load control signal) to the IC 21. When the IC 21 receives the OFF mode signal, the IC 21 performs OFF control on all of the first to fourth semiconductor relays TR1 to TR4. Therefore, none of the lamps 4a, 4b, 5a, 5b are energized, and all the lamps 4a, etc. remain off.

Next, when the write control switch unit 3 is set to the LO mode, the switch unit 3 sends the L level HEAD signal SS1 (ON signal) and the L level LO signal SS2 (ON signal) to the microcomputer 22. Signal), H-level HI signal SS3 (OFF signal), H-level FLS
The H signal SS4 (off signal) is output. Then, the microcomputer 22 determines that the light control switch unit 3 is in the LO mode based on the combination of the levels of the signals SS1 to SS4, and outputs the LO mode signal (the first load control signal, the lamp 4a , 5a) to the IC 21. IC21 is the L
When an O-mode signal is input, the first and third semiconductor relays TR1 and TR3 are turned on, and the second and fourth semiconductor relays TR2 and TR4 are turned off. Therefore, the lamps 4a and 5a are turned on by the continuous supply of electric power, and the lamps 4b and 5b remain off because they are not energized.

When the lamps 4a, 5a are energized, a current (for example, a current corresponding to the load current of the lamps 4a, 5a) flows through the first and third current sensors F1, F3. Then, the voltage across the current sensor corresponding to the current is taken into the IC 21, and the microcomputer 22 determines whether the current is a rare short or dead short abnormal current. When the microcomputer 22 determines that the current is a rare short or dead short abnormal current, the microcomputer 22 sends the IC 21
Is output. Then, even if the IC 21 is in the state where the LO mode signal is input, when the energization cutoff signal is input, the semiconductor relay (for example, when the IC 21 flows into the first current sensor F1 and has a possibility of an abnormal current of rare short or dead short flowing). If the current is a rare short or dead short abnormal current, the first semiconductor relay TR1) is turned off and a DIAG output signal S5 is output. Therefore, in this case, since the lamp 4a is not energized, it is turned off and only the lamp 5a is turned on.

Next, when the light control switch unit 3 is set to the HI mode, the switch unit 3 sends the L level HEAD signal SS1 (ON signal) and the H level LO signal SS2 (OFF Signal), L level HI signal SS3 (ON signal), H level FLS
The H signal SS4 (off signal) is output. Then, the microcomputer 22 determines that the light control switch unit 3 is in the HI mode based on the combination of the levels of the signals SS1 to SS4, and outputs the HI mode signal (the first load control signal and the lamp 4b , 5b) to the IC 21. The IC 21
When an I-mode signal is input, the second and fourth semiconductor relays TR2 and TR4 are turned on, and the first and third semiconductor relays TR1 and TR3 are turned off. Therefore, the lamps 4b and 5b are turned on by continuous power supply, and are turned off because the lamps 4a and 5a are not energized.

When the lamps 4b and 5b are energized, a current (for example, a current corresponding to the load current of the lamps 4b and 5b) flows through the second and fourth current sensors F2 and F4. Then, the voltage across the current sensor corresponding to the current is taken into the IC 21, and the microcomputer 22 determines whether the current is a rare short or dead short abnormal current. When the microcomputer 22 determines that the current is a rare short or dead short abnormal current, the microcomputer 22 sends the IC 21
Is output. Then, even when the IC 21 is in the state of inputting the HI mode signal, when the energization cutoff signal is input, the semiconductor relay (for example, the current flowing to the second current sensor F2, which may flow an abnormal current of rare short or dead short). If the current is a rare short or dead short abnormal current, the second semiconductor relay TR2) is turned off and a DIAG output signal S5 is output. Therefore, in this case, since the lamp 4b is not energized, it is turned off, and only the lamp 5b is turned on.

Next, when the light control switch section 3 is set to the FLSH mode,
From the microcomputer 22 to the H-level HEAD signal SS1.
(OFF signal), L-level or H-level LO signal SS2
(When L level is an ON signal, when it is H level, an OFF signal), L level HI signal SS3 (ON signal),
An L-level FLSH signal SS4 (ON signal) is output. Then, the microcomputer 22 outputs the signals SS1 to SS
4 is determined to be in the FLSH mode based on the combination of the four levels.
An SH mode signal (a first load control signal, which is a driving permission signal for the lamps 4b and 5b) is output to the IC 21.

When the IC 21 receives the FLSH mode signal, the switch 21 outputs a low-level FLSH signal SS4 (ON signal) to the microcomputer 22 (the movable contact 13a is connected to the first fixed contact 13b). Is ON), the second and fourth semiconductor relays TR2 and TR4 are turned on, and the first and third semiconductor relays T2 and TR4 are turned on.
Off control is performed on R1 and TR3. Therefore, while the movable contact 13a is connected to the first fixed contact 13b, the lamps 4b and 5b are turned on by continuous power supply, and the lamps 4a and 5a are turned off because they are not energized.

When the LO signal SS2 is at the L level (ON signal), the L level FLSH signal SS4
While the (ON signal) is being output (while the movable contact 13a is connected to the first fixed contact 13b), the IC 21
The ON control is also performed on the first and third semiconductor relays TR1 and TR3. Therefore, in this case, while the movable contact 13a is connected to the first fixed contact 13b, the lamps 4a, 5
a is also energized and all lamps (4a, 4b, 5a, 5a
b) lights up.

In these cases, too, the second and fourth current sensors F2, F4 or the first to fourth current sensors F1
When a current (for example, a current corresponding to the load current of the lamps 4b, 5b) flows through F4 and the microcomputer 22 determines that the current is a rare short or dead short abnormal current, the microcomputer 22 sends the current to the IC 21. An energization cutoff signal is output. Then, similarly to the above, even when the IC 21 is in the state where the FLSH mode signal is input, the semiconductor relay (for example, the current flowing through the second current sensor F2) in which an abnormal current of rare short or dead short may flow. Is a rare short or dead short abnormal current, the second semiconductor relay TR2) is turned off and a DIAG output signal S5 is output. Therefore, in these cases, the lamp 4b is not energized and is turned off, and only the lamp 5b or three lamps (4
a, 5a, 5b) are turned on.

Next, the operation when the judgment section H of the intelligent fuse 2 does not operate normally (for a failure) for some reason will be described. In this case, even if the current flowing through each of the current sensors F1 to F4 is an abnormal current such as a rare short circuit or a dead short circuit, the microcomputer 22 of the determining unit H may not be able to determine the abnormal current. However, in the present embodiment, since the sensors with a fuse function are used for the current sensors F1 to F4, the light control switch unit 3 is set to each of the modes (eg, the LO mode) when the above-described determination unit H fails. And the current sensor (first
When a current (for example, a current corresponding to the load current of the lamp 4a) flows through the current sensor F1 or the like and the current is a dead short abnormal current, the following is performed.

That is, a current sensor in which a dead short abnormal current flows (for example, if the current flowing in the first current sensor F1 is a dead short abnormal current,
The first current sensor F1) is blown by its own fuse function, and the circuit is protected. Therefore, in this case, the lamp 4a is turned off because the lamp 4a is not energized.

Next, the operation when the lamp (4a or the like) is broken will be described. When the light control switch unit 3 is set to any of the LO mode, the HI mode, and the FLSH mode, as described above,
The lamp (4a or the like) is energized according to each mode, and a current flows to the current sensor (F1 or the like). For example, when the switch unit 3 is in the LO mode, the first and third semiconductor relays TR1 and TR3 are controlled to be on, and the lamps 4a,
5a is energized, and a current flows through the first and third current sensors F1, F3. Then, a voltage across the current sensor according to the current is output from the differential amplifier circuit of the IC 21.

Here, for example, when the bulb of the lamp 4a is cut off, no current flows through the first current sensor F1 (the current is zero), so that the voltage across both ends of the first current sensor F1 (current × impedance) ) Becomes zero. Therefore, when no current flows through the first current sensor F1 even though the switch unit 3 is in the LO mode, the determination unit H determines that the lamp 4a is out of ball, and the DIAG output signal S
5 (see FIG. 2) is continuously output.

When the switch unit 3 is in one of the LO mode, the HI mode, and the FLSH mode, and the switch 3 is at least one of the lamps 4a, 4b, 5a, and 5b to be energized. Even when the current does not flow through the relevant current sensor (such as F1), the determination unit H continuously outputs the DIAG output signal S5 as described above. Then, by lighting an LED (not shown) that is turned on based on the DIAG output signal S5 (abnormal display), the driver is notified of the running out of the lamp (ball running out detection).

As described above, when the lamp 4a is out of the ball in the LO mode, for example,
The judgment unit H uses the lamp 4b instead of the lamp 4a
DUTY control is performed via 21 to supply power intermittently to the lamp 4b so that the lamp 4b appears to be lit at substantially the same brightness as the lamp 4a when lit.

Further, for example, when the lamp 4a is in the state of being almost burned out, a current smaller than the current to flow through the first current sensor F1 flows.
The voltage across both terminals (current × impedance) becomes a voltage smaller than the voltage to be applied. Therefore, when only a current smaller than a predetermined current (a current that should flow through the first current sensor F1) flows through the first current sensor F1, the determination unit H determines that the lamp 4a is in a state just before the ball is cut out. , Output the DIAG output signal S5 intermittently. Then, by blinking the LED (abnormal display), the driver is informed that the lamp is about to be out of the ball (predicting the out of ball).

Next, an IG signal S1, a vehicle speed sensor signal S2, a door courtesy signal S3, an illuminance sensor signal S
4 (see FIG. 2) will be described. First, when the light control switch unit 3 is set to the HI mode to drive the vehicle, and thereafter, for example, at a traffic intersection (temporary stop) at an intersection or the like, the following is performed. While the vehicle is running, the lamps 4b and 5b are turned on because the vehicle is in the HI mode. Thereafter, when the vehicle is temporarily stopped, a vehicle speed sensor signal S2 indicating that the speed of the vehicle is zero is output from the vehicle speed sensor to the determination unit H. Then, based on the vehicle speed sensor signal S2, the determination unit H determines that the vehicle is stopped, and the second and fourth semiconductor relays TR
2. Turn off the TR4 to turn off the lamps 4b and 5b, and set the first and third semiconductor relays TR1 and TR3 to D.
UTY control is performed to supply power intermittently to the lamps 4a, 5a so that the lamps 4a, 5a appear to be lit darker than usual.

Thereafter, when the vehicle is run again, a vehicle speed sensor signal S2 indicating that the speed of the vehicle is no longer zero is output from the vehicle speed sensor to the determination unit H. Then, based on the vehicle speed sensor signal S2, the judgment unit H judges that the car is running, and the switch unit 3 sets the HI
Since the mode is set, the first and third semiconductor relays TR1 and TR3 are turned off to turn off the lamps 4a and 5a, and the second and fourth semiconductor relays TR2 and TR4 are turned on to turn on the lamps 4b and 5b. Lights up.

Next, when the light control switch section 3 is set to the HI mode, the vehicle is driven, the vehicle is stopped, and the vehicle is further exited (while the HI mode is maintained), the following operation is performed. When the vehicle stops after traveling in the HI mode, the determination unit H performs the second and fourth determinations based on the vehicle speed sensor signal S2 indicating that the vehicle speed is zero, as described above.
The semiconductor relays TR2 and TR4 are turned off to control the lamp 4
b, 5b are turned off, and the first and third semiconductor relays T
DUTY control is performed on R1 and TR3 so that the lamps 4a and 5a appear to be lit lower than usual.

Thereafter, when the driver turns off the IG switch (turns off the engine) and further opens the door as the vehicle gets off, the IG switch outputs an IG signal S1 (off signal) to the determination section H, A door courtesy signal S3 (off signal) is output from the door courtesy switch to the determination unit H. Then, based on the IG signal S1 and the door courtesy signal S3, the determination unit H determines that the driver gets off the vehicle, and the lamps 4a and 5a are lit even though the driver gets off the vehicle. Semiconductor relay TR1, TR
3 is turned off to turn off the lamps 4a and 5a, and all four lamps (4a and the like) are automatically turned off.

Again, the driver gets on the vehicle and turns on the IG switch (turns on) or turns on the head switch 11 of the light control switch section 3 again (after disconnecting the movable contact 11a and the fixed contact 11b). Then, the movable contact 11a is connected to the fixed contact 11b again) to return to normal lighting (however, when the vehicle is stopped, the light is dimmed).

Next, the light control switch unit 3 is set to the OFF mode to drive the automobile, and thereafter, for example, when the vehicle is approaching a tunnel (the switch unit 3 is
(In the FF mode) as follows. in this case,
Since the mode is the OFF mode, the vehicle approaches the tunnel in a state where all the lamps 4a and the like are turned off. Since the illuminance inside the tunnel is smaller (darker) than that outside the tunnel, the illuminance sensor sends a determination illuminance to the determination unit H to determine that the surrounding illuminance is a predetermined illuminance (eg
30 lux) or less, the illuminance sensor signal S4 indicating that
Is output. Then, based on the illuminance sensor signal S4, the determination unit H determines that the OFF mode is set in spite of the surroundings being dark.
The first and third semiconductor relays TR1 and TR3 are turned on to continuously supply power to the lamps 4a and 5a,
a and 5a are automatically turned on.

Thereafter, when the vehicle passes through the tunnel, the illuminance sensor informs the judgment section H that the surrounding illuminance is equal to the predetermined illuminance (30
Lux) is output. Then, based on the illuminance sensor signal S4, the determination unit H determines that the car is traveling in a bright place, and since the switch unit 3 is set to the OFF mode, the first and third semiconductor relays are set. TR1, T
R3 is turned off to turn off the lamps 4a and 5a, and all four lamps (4a and the like) are turned off.

Therefore, according to the present embodiment, the following effects can be obtained. (1) In this embodiment, when the signals SS1 to SS4 are input from the switches 11 to 13 to the microcomputer 22 of the determination unit H of the intelligent fuse 2, based on the combination of the levels of the four signals SS1 to SS4. Thus, the mode (OFF mode or the like) of the light control switch unit 3 is determined. Then, for each mode, the lamp 4
The power is continuously supplied to or the like, or the supply of power is continuously stopped, and the lamp 4a or the like is kept on or off. Accordingly, each signal SS1 is output from each switch 11-13.
Only by inputting the signals .about.SS4, it is possible to perform drive control such that the lamp 4a and the like are continuously turned on or continuously turned off.

(2) In the present embodiment, when each signal S1 to S4 is input to the judgment unit H from an IG switch or the like, the lamp is determined based on the combination of each signal S1 to S4 and each of the signals SS1 to SS4. Electric power is intermittently supplied to the lamps 4a and the like, and the lamps 4a and the like repeatedly turn on and off. Therefore, only by inputting the signals S1 to S4 and SS1 to SS4, it is possible to perform drive control of intermittently lighting the lamp 4a and the like (repetition of lighting and extinguishing).

(3) In this embodiment, the load (the lamp 4a
Etc.) are energized and the current sensor (first current sensor F1 etc.)
When the current flows through the microcomputer 22, the microcomputer 22 determines whether the current is a rare short or dead short abnormal current. When it is determined that the current is a rare short or dead short abnormal current, the driving of the load (the lamp 4a and the like) by the semiconductor relay (the first semiconductor relay TR1 and the like) is stopped. Therefore,
Electric wires and the like can be protected from an abnormal current such as rare short or dead short.

(4) In this embodiment, when the judgment unit H of the intelligent fuse 2 fails for some reason,
When a dead short occurs in the headlight drive control device 1 and an abnormal current of a dead short flows to a current sensor (the first current sensor F1 or the like), the current sensor is blown. It can protect against abnormal current of dead short.

(5) In this embodiment, no load current flows through the electric wires WA to WD connecting the light control switch section 3 and the intelligent fuse 2 to the lamp 4a and the like. Therefore, even if a power line such as the conventional electric wires W1 and W2 is not used for the electric wires WA to WD, a signal line (a thin and light and inexpensive thin line) has a smaller allowable current value than a power line (thick and heavy and expensive). Can be used. Therefore, it is possible to drive and control the load (such as the lamp 4a) with a configuration that is less expensive than in the past. In addition, the device 1 can be simplified by using a thinner wire than in the related art.

(6) In this embodiment, since the lamps 4a, 4b, 5a, and 5b are driven using the first to fourth semiconductor relays TR1 to TR4 (small and inexpensive), mechanical relays (for example, conventional heads) are used. A lamp relay 41,
It is possible to drive and control the lamp 4a and the like with a configuration that is inexpensive as compared with the case of using (large and expensive). Further, the size of the device 1 can be reduced as compared with the related art.

(7) In this embodiment, the switches 11 to
Since no load current flows through switch 13, each of switches 11 to 1
For 3 (small and inexpensive), it is possible to use a switch having a contact whose allowable current value is smaller than that of the conventional changeover switch 34 (large and expensive). Therefore, the cost of the headlight drive control device 1 can be reduced. Further, the size of the device 1 can be reduced as compared with the related art.

(8) In this embodiment, the lamps 4a, 4a
b, 5a, 5b in a state where current is to be supplied (for example, in the LO mode and current is to be supplied to the lamps 4a, 5a), the lamp (in this case, the lamps 4a, 5a When no current is supplied to the target, the DIAG output signal S5 is continuously output from the determination unit H. And in such a case, DI
Since the LED (not shown) which is turned on based on the AG output signal S5 is turned on (abnormal display), it is possible to notify the driver of the running out of the lamp (ball running out detection).

(9) In the present embodiment, when the notification of the out-of-ball is issued as in (8), the lamp 4b is replaced with the lamp 4b instead of the lamp (for example, the lamp 4a) which caused the out-of-ball.
Is subjected to DUTY control (intermittent power supply) so that the lamp 4b appears to be lit at substantially the same brightness as the lamp 4a when lit. Therefore, when the LO side lamp (4a or 5a) is out of the ball, the HI side lamp (4b or 5b) causes the LO side lamp (4a or 5a).
Can be realized.

(10) In this embodiment, the lamp (4a
, Etc.), the state is just before the ball has run out even if the ball has not run out, and the DIAG output signal S5 is intermittently output from the determination unit H. And in such a case,
Because the LED described in (8) blinked (abnormal display)
It is possible to notify the driver that the lamp is on the verge of running out of ball (forecasting running out of ball).

(11) In this embodiment, when the light control switch unit 3 is set to the HI mode to drive the car, and thereafter, for example, when waiting for a traffic light (temporary stop) at an intersection or the like, the signal from the vehicle speed sensor is used. Vehicle speed sensor signal S
2, the determination unit H determines that the car is stopped. Then, the lamps 4b and 5b, which should be turned on in the HI mode, are turned off.
b, lamp 4 that appears to be lit darker than 5b
a and 5a were lit so that they seemed to be lit even darker than usual. Therefore, the driver of the oncoming vehicle is automatically protected from glare, and furthermore, unnecessary lighting can be eliminated, thereby contributing to energy saving.

(12) In this embodiment, when the vehicle is driven after the light control switch section 3 is set to the HI mode, the vehicle is stopped, and then the vehicle is to be dismounted (while the HI mode is maintained), the vehicle speed sensor signal is output. Based on S2, the IG signal S1 from the IG switch, and the door courtesy signal S3 from the door courtesy switch, the determination unit H determines that the driver gets off the vehicle. Then, the four lamps (4a and the like) are automatically turned off. Therefore, when the driver forgets to return the switch unit 3 from the HI mode to the OFF mode at the time of getting off (forgetting to turn off), unnecessary lamp lighting can be avoided, and the battery can be prevented from running out. In addition, since unnecessary lighting is eliminated, it is possible to contribute to energy saving.

(13) In this embodiment, the vehicle is driven with the light control switch unit 3 set to the OFF mode, and thereafter, for example, when the vehicle is approaching a tunnel (the switch unit 3 remains in the OFF mode), Based on the illuminance sensor signal S4 from the illuminance sensor, the determination unit H determines that the OFF mode is set even though the surroundings are dark. Then, the lamps 4a and 5a are automatically turned on. Therefore, lamp 4 is automatically
By lighting a and 5a, the driver can drive safely when traveling in a tunnel or the like.

(14) In this embodiment, each switch 11
By composing a plurality of modes in 〜13, it is possible to turn on (drive) or turn off (stop) the load (such as the lamp 4a) for each mode.

The above embodiment may be modified as follows. In the above-described embodiment, the intelligent fuse 2 used in the headlight drive control device 1 for turning on or off the headlight for the vehicle is embodied. However, instead of the headlight drive control device 1, the vehicle wiper is drive-controlled. The present invention may be embodied in an intelligent fuse used in a wiper drive control device. In this case,
Instead of the lamps 4a, 4b, 5a, and 5b in the embodiment, an HI-side wiper motor and an LO-side wiper motor are used. As input means, a wiper switch is used in place of the switches 11 to 13 in the above-described embodiment, and the wiper switch is in an OFF mode (both wiper motors are stopped), an INT mode (intermittent drive of a LO-side wiper motor), and a LO mode (LO-side). It can be set to each mode of a low-speed drive by a wiper motor) and an HI mode (high-speed drive by an HI-side wiper motor).

In this case, in the wiper drive control device, the same effects as (1) to (7) in the above embodiment can be obtained. Further, for example, when each wiper motor is locked, the current flowing in the circuit through which the load current flows (the lock current of the wiper motor) is larger than the normal time (unlocked time). If it is determined that the current is an abnormal current due to locking, the driving of the wiper motor by the semiconductor relay may be stopped. With this configuration, when the wiper motor is locked, the electric wires and the like can be protected from an abnormal current of the lock.

As an example of locking the wiper motor,
For example, when something is caught between the front windshield (rear wiper) and the front windshield wiper (rear windshield) that wipes raindrops or the like attached to the windshield (rear windshield), or in a cold region.

Further, only the HI wiper motor is used as a load, the HI wiper motor is continuously energized in the HI mode, and the HI wiper motor is driven at a low speed by the DUTY control (the rotation speed control of the HI wiper motor) in the LO mode. You may do so. In such a case, the LO mode and the HI mode can be realized by one motor (HI-side wiper motor), and the wiper drive control device can be simplified.

In the above-described embodiment, four input signals (codes SS1 to SS1) from three switches (codes 11 to 13) are used.
S4), four loads (reference numerals 4a, 4b, 5)
Although the drive control (lighting or extinguishing) of (a, 5b) is performed, the following may be performed. That is, instead of the changeover switch 12, a LO switch and a HI switch are provided, and the LO signal SS2 is input from the LO switch, and the HI signal SS3 is input from the HI switch, and four input signals are input from the four switches. May be.

In the above-described embodiment, a plurality (three in the above-described embodiment) from a plurality of input means (three in this embodiment)
Based on the combination of the input signals, power is continuously supplied to a plurality of (four in the above embodiment) loads, power supply is continuously stopped, or intermittently. Although the present invention is embodied in a load drive control device for supplying electric power, a load drive control device as described in the following (1) to (6) may be used.

(1) A load drive control device that continuously supplies power to one load or continuously stops supplying power based on one input signal from one input means.

(2) A load drive control device for intermittently supplying power to one load based on one input signal from one input means. (3) A load drive control device that continuously supplies power to a plurality of loads or continuously stops supplying power based on one input signal from one input unit.

(4) A load drive control device for intermittently supplying power to a plurality of loads based on one input signal from one input means. (5) A load drive control device that continuously supplies power to one load or continuously stops supplying power based on a combination of a plurality of input signals from a plurality of input means.

(6) A load drive control device for intermittently supplying power to one load based on a combination of a plurality of input signals from a plurality of input means. That is, at least one input means is required, and at least one load is required.

In the above-described embodiment, the example in which the intelligent fuse 2 as the load drive control device is used in the headlight drive control device 1 for an automobile has been embodied. , DEF
It may be used for various load circuits used in automobiles, such as circuits, and may be used for load circuits for other transportation equipment such as aircraft and other electric equipment. In addition, intelligent fuse 2
Other load drive control devices may be used.

In the above-described embodiment, the first to fourth current sensors F1 to F4 (all of which have a fuse function) are used as current detection means. However, instead of a sensor having a fuse function, a thermistor is used as a current detection means. A Hall element or the like that can output in proportion to the current value may be used.

In the above embodiment, the judgment unit H is connected to the IC 21
And the microcomputer 22, the determination unit H may be configured by an electric circuit. In the above-described embodiment, a semiconductor relay (a so-called FET, which is denoted by reference numerals TR1 to TR4) is used as the driving unit.
Instead of the FET, a driving means capable of turning on / off the circuit by a signal such as a mechanical relay may be used.

In the above embodiment, the present invention is embodied in the intelligent fuse 2 of four circuits (including four current sensors and four semiconductor relays, respectively).
The invention may be embodied as an intelligent fuse of one circuit or an intelligent fuse in which a plurality of circuits of two or more circuits are formed as one unit.

Next, technical ideas other than the invention described in the claims which can be understood from the above-described embodiment and other examples will be described below together with their effects. (A) The load is a wiper motor for a vehicle that is rotated or stopped in each of a plurality of modes, and the input unit includes:
The load drive control device according to any one of claims 1 to 4, wherein the load drive control device is a wiper switch that can configure the plurality of modes to rotate or stop the wiper motor.

Therefore, according to the invention described in (a), in the load drive control device for controlling (rotating or stopping) the wiper motor for an automobile, any one of claims 1 to 4 is provided. The effects of the described invention can be realized.

[0098]

According to the first aspect of the present invention, power is continuously supplied to at least one load only by inputting an input signal from at least one input means, or continuously. The driving of the load can be controlled so as to stop supplying power or supply power intermittently.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, when the current flowing through the circuit through which the load current flowing through the load is abnormal, the driving means is used. Since the driving of the load is stopped, it is possible to protect electric wires and the like in the device from abnormal current.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, when a rare short or dead short abnormal current flows in a circuit through which a load current flows (rare short or dead short) When a dead short occurs), the drive of the load by the driving means is stopped by the abnormality determining means, so that the electric wires and the like in the device can be protected from a rare short or dead short abnormal current.

According to the fourth aspect of the present invention, in addition to the effect of the second aspect of the present invention, when the abnormality determining means does not operate normally for some reason, the circuit in which the load current flows is provided. When an abnormal current flows, the sensor having a fuse function is blown, so that an electric wire or the like in the device can be protected from the abnormal current.

According to the fifth aspect of the present invention, in addition to the effects of the first aspect of the present invention, a plurality of modes are constituted by the input means. The load can be driven or stopped in each mode.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an electric configuration of a headlight drive control device according to an embodiment.

FIG. 2 is an electric circuit diagram showing an electric configuration of the intelligent fuse.

FIG. 3 is an electric circuit diagram showing an electric configuration of a determination unit.

FIG. 4 is an electric circuit diagram showing an electric configuration of a conventional headlight driving device.

[Explanation of symbols]

2 ... Intelligent fuse as load drive control device, 4a ... LO side lamp as load, 4b ... HI side lamp as load, 5a ... LO side lamp as load,
5b: HI-side lamp as load, 11: head switch as input means, 12: changeover switch as input means, 13: flash switch as input means, B
... Battery power as a power supply circuit, H. Judgment unit as output means and abnormality judgment means, F1 to F4... First to fourth current sensors constituting current detection means and current sensors, respectively TR1 to TR4. And first to fourth semiconductor relays constituting a semiconductor relay.

Claims (5)

[Claims] An input signal is provided between at least one input means provided between a power supply circuit and at least one load driven by power supplied from the power supply circuit, and the one input signal or a plurality of the input signals is provided. The load is driven to continuously supply power to the load, or to continuously stop supplying power, or to supply power intermittently, based on a combination of input signals of Load drive control device to control. 2. An output unit that outputs a first load control signal including a drive permission signal for driving a load based on the one input signal or a combination of a plurality of input signals. A current detecting means provided on a circuit through which a load current flowing to the load flows when the load is driven based on the current detecting means, and whether the current detected by the current detecting means is abnormal Abnormality judging means for judging whether or not the load control signal is output, the second load control signal including a drive prohibition signal for prohibiting driving of the load, and a first load control from the output means. The load drive control device according to claim 1, further comprising: a drive unit that drives a load based on a signal and a second load control signal from the abnormality determination unit. 3. The abnormality judging means, when a characteristic value of a current flowing in a circuit through which the load current flows is larger than a predetermined characteristic value, the current is abnormal, that is, the current is rare short or dead. 3. The load drive control device according to claim 2, wherein the load drive control device determines that the current is a short circuit abnormal current. 4. The load drive control device according to claim 2, wherein said current detection means is a sensor having a fuse function. 5. The load is driven or stopped for each of a plurality of modes, and the input unit is capable of configuring the plurality of modes for driving or stopping the load. Item 1
The load drive control device according to claim 4.