JPH0230898B2 - SHARYOYONOHOKOSHIJISOCHINOSEIGYOSOCHI - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a turn signal light blinking control device that has a direction indicating function using a semiconductor integrated circuit. The present invention relates to a control device for a direction indicating device for a vehicle that is directly connected to a battery power source.

[Background Art] Direction flashing devices installed in vehicles such as automobiles are usually connected to a battery power source mounted on the vehicle via a power key switch. Therefore, when the key switch is opened, the power to the blinking control device is cut off.

However, depending on the type of flashing control device,
For the purpose of simplifying the configuration, there is a type in which a battery power source is directly connected without setting a key switch between the blinking control device and the battery. In the case of such a flashing control device that is directly connected to a battery power source, even when the vehicle is in a non-operating state and the turn signal lights are not flashing, the semiconductor constituting the flashing control device is constantly activated. Power is set to be supplied to the integrated circuit from the battery power supply, and the integrated circuit is maintained in an operation standby state. Therefore, if the vehicle continues to be in a non-driving state for a long period of time, the current supply capability of the battery power source will drop below its normal level.

In this case, although the power consumption in the standby state in which the direction indicator lamp does not blink is somewhat lower than that in the dimming operation, there is actually almost no difference.

When a turn signal flashing device for a vehicle is constructed using a semiconductor integrated circuit, it is necessary to use a semiconductor integrated circuit that has multiple functions, such as detecting a disconnection in a side direction signal light or detecting a short circuit in a direction signal light. It is becoming more and more structured as follows. That is, the circuit scale of semiconductor integrated circuits tends to increase, resulting in an increase in current consumption and standby current of the circuit. Therefore, if the vehicle continues to be in a non-driving state, there is a greater possibility that the battery will run out.

[Problems to be Solved by the Invention] This invention has been made in view of the above-mentioned points, and is particularly applicable when the turn signal blinking control device is set to be directly connected to a battery power source. Even when the vehicle is not running, the power consumption state of the flashing control device is set to the minimum state to ensure the safety of the battery power supply even when the vehicle is not running for a long period of time. It is an object of the present invention to provide a control device for a direction indicating device for a vehicle, which allows the vehicle direction indicating device to be improved.

[Means for Solving the Problems] That is, in the control device for a direction indicator according to the present invention, the blinking control device for a direction indicator light is configured by a semiconductor integrated circuit. The battery power supply is directly connected to the circuit without going through a switch circuit. A first constant voltage circuit sets a circuit that detects the open/closed state of the direction indicator switch to a constant voltage state, and a second constant voltage circuit that controls a circuit part that performs blinking control, etc., excluding the above circuit part, to a constant voltage state. A constant voltage output circuit portion of the second constant voltage circuit is set to a high impedance state when the direction indicating switch is open, and the constant voltage is controlled by the second constant voltage circuit. This controls the circuit part to a stopped state.

[Operation] In the control device configured as described above,
The flashing control circuit section of the direction indicator light and other functional sections are set to a stopped state when the direction indicator light is not driven, that is, when the direction indicator switch is open, and are set to a state where no power is consumed.
Therefore, even if the battery power supply is directly connected, when the vehicle is not running, the power consumption in the control circuit of this direction indicator is set to almost zero, and the on-board battery power is set to almost zero. The safety of the power supply is effectively guaranteed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 shows its configuration, in which a battery power supply 11 mounted on the vehicle includes a resistor 12 with a minute resistance value (0.01 to 0.1Ω) for current detection;
A contact 13b which is controlled to open and close depending on the excitation state of a coil 13a of a flashing control relay 13, and a direction indicator switch 14 are opened and connected to a direction indicator light circuit 15. in this case,
The excitation current to the coil 13a of the relay 13 is controlled by a blinking drive circuit 16 made up of a semiconductor integrated circuit.

The voltage signal generated corresponding to the current value flowing through the resistor 12 is set to be supplied to the first comparison circuit 17, and the first constant voltage circuit is connected to the first comparison circuit 17. A constant voltage signal from 18 is supplied as a reference voltage signal. 1st above
In the comparison circuit 17, the value of the current flowing through the resistor 12, that is, the value of the current flowing to the direction indicator circuit 15 when the relay 13 is driven by the flashing signal with the direction indicator switch 14 set. This detects whether the direction indicating switch 14 is open or closed. The detection signal from this comparison circuit 17 is supplied to the blinking drive circuit 16 and also to the blinking operation control circuit 19. In other words, the change in the number of flashes alerts the driver to a failure alert function.

The voltage signal generated by the resistor 12 is also supplied to an amplifier 20. This amplifier 20 amplifies the detected voltage signal and supplies an analog signal corresponding to the potential difference to the blinking drive circuit 16 and the second comparison circuit 21.

The blinking drive circuit 16 includes an oscillation circuit and a relay 1.
The oscillation circuit has a discharging capacitor 22 and a resistor 23 which are external elements, and the oscillation operation is turned on and off by the output signal of the flashing operation circuit 19. The charging/discharging operation is controlled by the output signal of the first comparison circuit 17. When the side light is disconnected, the output signal from the amplifier 20 changes, and the threshold value of the oscillation circuit is changed to change the number of blinks of the direction indicator light. When the light is disconnected, the threshold value of the oscillation circuit is changed by the output of the second comparator circuit 21 and the amplifier 20 to change the blinking state of the direction indicator light.

The blinking operation control circuit 19 inputs the output signal from the first comparison circuit 17 and the potential signal at point L on the input side of the direction indicating switch 14, and determines whether the direction indicating switch 14 is open or the contact 13b is open. and when the L point potential is in the power supply voltage state, that is, when the direction indicator switch 14 is in the open state, the operation of the blinking drive circuit 16 is stopped, and the operation of the amplifier 20, the second comparison circuit 21, and the blinking drive circuit is stopped. A detection signal is given to a second constant voltage circuit 24 that makes the circuit 16 constant voltage. In this case, the constant voltage output line l of the second constant voltage circuit 24 is set to a high impedance state, and this direction indicating switch 14
In the standby state in which the flash drive circuit 16 is open, an operation is performed to suppress the current consumption of the semiconductor integrated circuit constituting the blinking drive circuit 16 and the like. Here, the first constant voltage circuit 18 always controls the first comparator circuit 17 to a constant voltage state, regardless of the state of the direction indicating switch 14.

The abnormal voltage detection circuit 25 detects abnormal voltage when it occurs in the power supply line, and controls the blinking drive circuit 16 to forcibly drive the relay 13, and also controls the semiconductor device including the blinking drive circuit 16. It is set to function to suppress application of abnormal voltage to the integrated circuit.

Here, the resistors 26a and 26b protect the semiconductor element by limiting the current flowing through the semiconductor integrated circuit when an abnormal voltage occurs on the power supply line. In addition, the capacitor 27 absorbs and alleviates noise generated by the operation of the relay 13, and the capacitor 28 stabilizes the threshold of the oscillation circuit in the blinking drive circuit 16, and adjusts the blinking cycle by ripples in the power supply line, etc. suppresses fluctuations. Furthermore, the capacitor 29 is for absorbing radio wave noise and the like.

FIG. 2 shows the relationship between the power supply voltage and the voltage drop across the resistor 12 when the direction indicator lamp 15 is normal, when the side lamp is disconnected, and when the front lamp is disconnected. In other words, A shows the characteristics when the front, rear, side, and interior direction indicator lights of the vehicle are all in an abnormal state, and B and C show the characteristics when the side lights are disconnected and the front lights are disconnected, respectively. ing.

FIG. 3 shows a more specific version of the device shown in FIG. The open/close states of the relay 13 and the direction indicating switch 14 are detected based on a reference threshold value V1 set by a resistance circuit including the above. In this case, the threshold value has a characteristic B which is close to approximately zero potential as shown in FIG.
-1. Note that this threshold value may use characteristic B-2 that does not depend on fluctuations in the power supply voltage.

The amplifier 20 sends a voltage signal corresponding to the voltage drop across the resistor 12 from the S terminal to the transistor 30.
It amplifies and outputs the difference voltage between the reference threshold value V2 and the reference threshold value V2 set by the circuit including the circuit. The threshold value V2 in this case is
The characteristic A-1 is set close to the characteristic B in FIG.

Here, FIG. 4 shows the relationship between the output V3 of the amplifier 20 and the voltage drop across the resistor 12. In the normal state of the direction indicator light 21, the output V3 is in the state of region A, which is a low level saturated output state. It is in. and,
When the front light is disconnected, the output V3 of the amplifier 20 is in the region C and becomes a high level saturated output. In addition, when the side light is disconnected, the output V3 of the amplifier 20 is in the area B.
state, and a constant intermediate level output is generated independent of the power supply voltage.

The second comparison circuit 21 discriminates the output signal V3 from the amplifier 20 based on a reference threshold value V4 determined by the resistors 31 to 33, and turns on the transistor 34 when the front light is disconnected, thereby driving the blinking. By rapidly changing the threshold value determined by the resistors 35 to 39 of the oscillation circuit 161 of the circuit 16, the oscillation circuit 161
to change the oscillation period. The threshold value V4 of the second comparator circuit 21 is set as shown by D in FIG. 4, and the transistor 34 is set to remain in the OFF state during normal operation and when the side light is disconnected.

The blinking drive circuit 16 includes the oscillation circuit 161
The oscillation circuit 161 includes a charging/discharging circuit consisting of a resistor 23 and a capacitor 22 which are external elements, and a charging/discharging circuit of the capacitor 22 consisting of transistors 40 to 45. a comparator for detecting a discharge voltage; an energization control circuit configured by transistors 46, 47, and 80 for charging and discharging the capacitor 22 with the output of the first comparison circuit 17; and the resistors 36 to 37. a reference voltage circuit that generates a reference voltage for the comparator (transistors 40 to 45), and a transistor 4 that receives the output of the first comparison circuit 17 and changes the reference voltage.
8. Transistors 49 and 5 that receive the output of the comparator (transistors 40 to 45) and forcibly set the output V3 of the amplifier 20 to a high level saturated output state.
0, and a hysteresis circuit consisting of resistors 51 to 53.

The relay drive circuit 162 also includes transistors 54 and 55, resistors 56 to 58, and diodes 59 to 58.
61, and the diodes 60 and 61 suppress generation of back electromotive force in the relay coil 13a. Further, the diode 59 is made conductive when a negative surge voltage is applied to the power supply line, and by making the output transistor 55 conductive in the reverse direction, that is, the transistor 55 operates as a reverse transistor, and current is passed from the base to the collector. By doing so, this surge voltage is divided between the transistor 55 and the internal resistance of the relay coil 13a, and serves to protect the transistor 55.

FIG. 5 shows the blinking period of the direction indicator lamp corresponding to the oscillation period of the oscillation circuit with respect to the voltage drop of the detection resistor 12, and A to C correspond to the case of FIG. 4, respectively. be.

The abnormal voltage detection circuit 25 is composed of a transistor 62, a resistor 63, and a plurality of diodes 64. When an abnormal voltage is generated in the power supply line and the abnormal voltage exceeds a predetermined Zener voltage, the abnormal voltage detection circuit 25 detects the abnormal voltage. conducts between the power supply line and the lowest potential point in the semiconductor integrated circuit (diode 64).
This is to suppress the potential difference between the terminals (the ground side terminals of the transistors) to a predetermined Zener voltage, and also to turn on the transistor 62 and forcibly make the transistors 54 and 55 conductive.

Next, the blinking operation control circuit 19
5 and 66, and only when the point L connected to the direction indicator switch 14 is in a high-level potential state and the transistor 67 of the first comparison circuit 17 is off, the blinking drive circuit 16 is activated. It is set to turn on the transistor 80 and turn off the transistor 68 of the second constant voltage circuit 24. The logic configuration is such that when the direction indicating switch 14 is closed, the transistor 80 is always turned off and the transistor 68 is turned on.

The second constant voltage circuit 24 includes transistors 68,
69, further includes transistors 70 to 73, and a line l on the emitter side of transistor 73.
is kept at a constant voltage. The diodes 74 and 75 are temperature-compensating diodes, and prevent the constant voltage line l from changing due to temperature changes.

The first constant voltage circuit 18 includes a transistor 76,
It is composed of a diode 77 and a transistor 78 mirror-connected to the transistor 30, and makes the emitter potential of the transistor 76 a constant voltage.

Next, the reduction of current in the standby state, which is a feature of this control device, will be explained. First, when the direction indicating switch 14 is set to the open state, the transistor 65 is set to the off state as described above, and at the same time, the transistor 66 is logically configured to be turned off. Therefore, at this time, transistor 69 is set to the off state.
Since this transistor 69 is off, transistors 68, 71, and 72 are all off,
Therefore, the emitter-collector of the transistor 73 becomes in a high impedance state, and the currents of all the circuits connected to the emitter circuit of the transistor 73 are completely cut off.

That is, in this state, the current flowing through the semiconductor integrated circuits constituting these devices is only the current flowing through the first constant voltage circuit 18, first comparator circuit 17, and blinking operation control circuit 19. .
Even if the number of circuits connected to the emitter circuit of the transistor 73 increases, the standby current when the direction indicating switch 14 is open does not increase, and the power consumption of this device is reduced to the level described above. 1 constant voltage circuit 18, first comparison circuit 17,
The power consumption is only in the blinking operation control circuit 19.

Next, when the direction switch 14 is closed, the transistor 68 is turned on, and the collector current of the transistor 68 becomes a current determined by the resistor 79 set in the meantime, and the mirror-connected transistors 71, A similar current flows through the collector circuit of transistor 72, and transistor 73
The circuit portion connected to the emitter becomes operational and performs the desired function.

Figure 6 shows the relationship between standby current and battery power supply voltage. A shows the conventional case where the entire circuit is always connected to the battery power supply, while B shows the above case. It shows the characteristics of the device shown in the example.

[Effects of the Invention] As described above, according to the control device for a direction indicating device according to the present invention, when the direction indicating switch is in the open state in which the direction indicating device is not operated and displayed, the circuit portion that causes the direction indicating light to blink. This is a state in which power is cut off to the device, and power consumption in such a standby state is set to a minimum. Therefore, even if such a control device is configured with a semiconductor integrated circuit and this circuit is configured to be connected directly to the battery power supply without going through a key switch, the direction indication Even if the vehicle is not running for a long period of time when the switch is not operated, the power consumption of this turn signal device can be kept to a minimum, and the safety of the battery power supply installed in the vehicle is reliably guaranteed. This is what happens.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the configuration of a control device for a direction indicator device according to an embodiment of the present invention, and FIG. 2 shows the relationship between the current flowing through the direction indicator light detected by this control device and the power supply voltage. 3 is a circuit diagram showing the above-mentioned control device in more detail, FIG. 4 and FIG. The figure is a diagram showing a comparison of the state of power consumption in a standby state in the device shown in the above embodiment and a conventional device. 11...Battery power supply, 12...Resistor (lighting consumption current detection), 13...Relay, 14...Direction indicator switch, 15...Direction indicator circuit, 16...
Blinking drive circuit (semiconductor integrated circuit), 17...1st
Comparison circuit (turn signal lamp lighting current detection), 18
...First constant voltage circuit (for lighting current detection), 19
...Flashing operation control circuit (lighting current state detection), 2
0...Amplifier (side light disconnection detection), 21...Second
comparison circuit (front light disconnection detection), 24...second constant voltage circuit blinking control).

Claims (1)

[Claims] 1. A semiconductor integrated circuit for flashing control that is directly connected to an on-vehicle battery power source,
In this blinking control device that controls the blinking of turn signal lights using a semiconductor integrated circuit, the blinking control device includes a first constant voltage circuit that controls the lighting current supplied to the turn signal lights so that the circuit portion is in a constant voltage state. , Excluding the lighting current detection circuit portion controlled by the first constant voltage circuit, at least the blinking signal generation circuit portion of the semiconductor integrated circuit that performs blinking control of the turn signal lamp, etc. is controlled by a constant voltage. a second constant voltage circuit for controlling the direction indicator lamp, a means for detecting a state in which lighting current is not supplied to the direction indicator lamp, and an output circuit portion of the second constant voltage circuit in the detection state of the detection means. means for setting the output circuit to a high impedance state, and a circuit portion that performs blinking control that is constant voltage controlled by the second constant voltage circuit when the output circuit of the second constant voltage circuit is in the high impedance state. 1. A control device for a direction indicating device for a vehicle, characterized in that the control device is set to a stopped state in which no power is supplied.