JPS6336414A - Power feeding device for signal transmission control part - Google Patents

Abstract

PURPOSE:To eliminate the need to feed electricity to a control part at any time and to suppress unnecessary power consumption by connecting the output of a sensor group to the power terminal of the control part. CONSTITUTION:When an ignition switch 8 is on, the control part 4 is fed with electricity from a battery 1 through an ignition switch 8 and a signal is sent from a transmission part 41 to a reception part 42 according to a signal from the sensor group 2, so that a driving part 7 drives the load group 3 with the signal from the reception part 42. When the ignition switch 8 is off, the control part 4 is fed with no electricity on condition that none of sensors in the sensor group 2 generates an output, but when even one sensor generates its output, the control part 4 is fed with electricity through a diode 5 and a stabilizing circuit 6, thereby performing the same operation as that when the ignition switch 8 is on. Thus, the control part 4 need not be fed with electricity all the time when the ignition switch 8 is off, so the unnecessary power consumption can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply device for a signal transmission control section.

(Prior art) Taking a vehicle as an example, a vehicle has many sensors including various switches. For example, when a headlight switch is turned on, the headlights, small lights, license plate lights, instrument panel lighting lamps such as instruments etc. etc. will light up, and when the remaining fuel becomes low and the resistance value of the thermistor or liquid level detection unit reaches a predetermined value, the remaining fuel warning light installed on the meter will light up, and the liquid crystal display will indicate a lack of remaining fuel. In recent years, many sensors have been used to drive loads for many displays, etc., and the display is performed by receiving signals from multiple sensors. In addition, it is becoming practical to adopt a multiplex transmission system to simplify line wiring.

In such cases, instead of connecting the sensor output directly to the load drive unit as in the past, it is necessary to input the sensor output to the control unit and drive the load according to the output of this control unit. I'll come.

(Problem to be Solved by the Invention) By the way, among the above sensor groups, for example, if the transmission signal is for displaying the engine speed on a meter, there is a problem because the signal is always emitted when the ignition switch is in the ON state. However, even when the ignition switch is in the OFF state, signals such as herad lights, parking lights, hazard lights, etc. should be emitted if the switch is turned on, so the sensor group is activated even when the ignition switch is OFF. so that it can detect signals from
It is necessary to constantly supply power to the control unit.

However, this constant power supply consumes unnecessary power, and especially in vehicles that use batteries as a power source, it is recommended to reduce power consumption as much as possible when the ignition switch (main switch) is turned off. If this is not done, there is a problem that the so-called battery is likely to die.

(Means for Solving the Problems) The present invention has been made in view of the above, and includes a group of sensors that output electrical signals according to the object to be detected, and a signal that receives the output of the sensor group and generates a signal according to the output. In the mouth-type signal transmission system equipped with a power supply and a power supply, the output of the sensor group is connected to the power supply terminal of the control section.

(Function) Therefore, even if power is not constantly supplied to the control section from the power source, power is supplied to the control section by the output of the sensor.

(Example) FIG. 1 shows an embodiment of the present invention.

In the figure, l denotes a battery as an on-vehicle power source, which is connected to a sensor group 2 and a load group 3 to enable power supply. In the sensor group 2, the number of lines equal to the number of output lines of each sensor is connected to the control unit 4.
The sensor output signal is emitted through this line, and the output signal is sent to the drive section 7 according to the output from the diode group 2.The drive section 7 drives the load group 3 according to this output signal. is configured to do so.

Note that 8 is an ignition switch disposed between the battery 1 and the cathode of the diode 5.

Figure 2A, Figure 2B, Figure 2C5 second diagram, respectively.
Sensor group 2, load group 3, drive section 7, and control section 4 in Fig. 1
This shows a specific example of the configuration.

That is, the sensor group 2 is composed of a headlight switch 21, a direction indicator switch 22, and a circuit including various switches and sensors, such as a remaining fuel warning sensor 23 composed of a resistor, a thermistor, and an operational amplifier. In addition to the navel lamp 31, direction indicator lamp 32, remaining fuel warning lamp 33, it is composed of loads such as a buzzer 34 and a liquid crystal display element.
In addition to transistors 71, 72, and 73, the drive unit 7 includes, for example, a drive circuit that drives a liquid crystal display element, and the control unit 4 outputs a multiplexed signal according to the output signals of the sensor group 2. It is composed of a transmitting section 41 and a receiving section 42 that receives a signal from the transmitting section 41 and sends the signal to the driving section 7.

The operation of the above configuration will be explained.

When the ignition switch 8 is in the ON state, the control unit 4
is supplied with power from the battery 1 via the ignition switch 8, sends a signal from the transmitting section 4I to the receiving section 42 in response to the signal from the sensor group 2, and the driving section 7 drives the load group 3 based on the signal from the receiving section 42. do.

When the ignition switch 8 is in the OFF state and there is no output from each sensor in the sensor group 2, power is not supplied to the control unit 4, but if even one sensor outputs, it causes the diode 5 to stabilize. Power is supplied to the control unit 4 via the circuit 6, and the ignition switch 8 is
When is in the ON state, the same operation as 1 is performed.

According to the above embodiment, the ignition switch 8 is turned on.
Since there is no need to constantly supply power to the control unit 4 in the FF state, unnecessary power consumption can be suppressed, and when there is output from the sensor group, the load group can be driven accordingly.

In the present embodiment, the control unit 4 is composed of a control unit that transmits multiplexed signals and a reception unit, but it may output a predetermined signal depending on, for example, a combination of output signals from the sensor group 2. In addition, the sensor group, load group, and drive section may be other than those shown above, and the drive section may be integrated within the control section.

Furthermore, as shown in FIG.
If it is interposed between the battery 1 and the load group 3, it is possible to reliably cut off the power to the load group 3 when there is no sensor output when the power is turned off.

(Effects of the Invention) According to the present invention, there is no need to constantly supply power to the control unit when a main switch such as an ignition switch is in the OFF state, and unnecessary power consumption can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2A, FIG. 2B, FIG. FIG. 3 is a diagram showing a specific example of the control section, and is a circuit diagram showing an example in which a switch means is interposed between the power source and the load group. 1.-Power supply 2-Sensor group 3=--Load group 4--Control section 5--Diode 7-Drive section 8--Ignition switch 1 Fig. 2 0 Fig. 2 D

Claims (1)

[Claims] A group of sensors that output electrical signals depending on the object to be detected;
A control section that receives the outputs of the sensor group and outputs signals according to the outputs, a load group that operates according to the output signals of the control section, and a power supply that can supply power to the control section and the load groups. What is claimed is: 1. A power supply device for a signal transmission control unit, characterized in that the output of the sensor group is connected to a power supply terminal of the control unit.