JPH05213121A - Controller - Google Patents

Abstract

PURPOSE:To provide a controller which promotes decrease in a dark current more highly and enables integration of a control system. CONSTITUTION:This controller is provided with an input part where input signals from a sensor 52a or a volume 51a and plural operating switches 56a-58a, and an output part provided with a CPU 62a which becomes an operating mode when the input signals are supplied and becomes a standby mode when all of them are cut off. Moreover, this controller is also provided with a wake-up circuit 73 which outputs a power supply stopping signal at the stand-by mode, and a power supply cut-off circuit 60 which cuts off power supply to the input part and the output part based on the power supply stopping signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for driving and controlling electrical equipment such as a lighting device, a signal device, and a wiper provided in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in an automobile, a controller is used which controls energization of an electric component (load) such as a light, a motor or a solenoid according to an input signal from an input component such as an operation switch or a sensor. ..

In order to prevent the battery from going up due to an increase in dark current due to such a controller, conventionally, a method of supplying a current from the battery to the controller in conjunction with turning on an ignition key (starter key) has been implemented (ignition). Key interlocking controller), to reduce dark current.

However, in the method described above,
Since power is not supplied to the controller when the ignition key is turned off, it cannot be applied to a load that needs to be operated when the key is turned off, such as control of a door lock or a lamp. Therefore, it is necessary to directly supply power to the controller for controlling such a load from the battery without using the ignition key. For example, there is one shown in FIG.

This controller 10 has an input terminal 11,
12, 13, 14 are provided, and the input terminal 11 has
The positive electrode of the battery power source B is supplied. Further, a signal from the sensor 12a is supplied to the input terminal 12, and
A signal from the volume 13a is supplied to the input terminal 13.

A regulator 15 for voltage adjustment is connected to the inside of the controller 10 via an input terminal 11. Furthermore, the input terminals 11, 12, and 13 have
Level adjustment resistors 16, 17, 18, 19, 20, 2
1 and an input circuit composed of an A / D converter 22 are connected. A CPU 23a with a standby function is connected to the output side of the A / D converter 22, and the output side is connected to loads 26 and 27 such as electrical equipment via output terminals 24 and 25 via the output interface 23b. ..

In such a controller, a current is directly supplied from the battery power source B, and the CPU 23a executes a predetermined program in accordance with input signals from the sensor 12a and the volume 13a to drive and control the loads 26 and 27.

[0008]

In such a controller (battery direct connection type controller) which is directly supplied with power from the battery as described above, the dark current increases as the size of the controller increases. Further, it is difficult to integrate the ignition key interlocking controller and the battery direct connection controller. That is, when trying to control the operation of loads connected to these controllers in a unified manner, for example, when it is necessary to control another controller based on the control state of the ignition key interlocking type controller, when the ignition key is off, the ignition key is turned off. Power is not being supplied to the key-linked controller, which results in loss of control.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a controller that further promotes reduction of dark current and enables integration of control systems.

[0010]

To achieve the above object, the present invention provides an input section to which an input signal from an input component including a sensor or a volume is supplied, and an operation mode when the input signal is supplied. In a controller having an output unit having a central processing unit that is in a standby mode when all the input signals are cut off, signal output means for outputting a power stop signal in the standby mode,
Power supply cutoff means for cutting off power supply to the input unit and the output unit based on the power supply stop signal is provided.

[0011]

According to the present invention, for example, when any one of a plurality of operation switches is turned on and an input signal is supplied to the input section, the power supply cutoff means is output by the signal output from the signal output means. Supplies power to the input section and the output section, and the central processing unit enters the operation mode. As a result, the load connected to the output side of the central processing unit is drive-controlled.

When all the plurality of switches are turned off and the input signal is no longer supplied to the input section, the signal output means outputs a power stop signal to the power cutoff means. The power cutoff means receives the power stop signal and cuts off unnecessary power supply of the power supplied from the battery power supply to the input unit and the output unit, for example. At the same time, the central processing unit shifts to a standby mode, which consumes less power than the operating mode.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a controller according to the present invention.

The controller 50 of the present embodiment controls the drive of electric components mounted on an automobile, and has an input terminal 5
1 to 58 are provided. To the input terminal 51, the positive electrode of the battery power source B (for example, 12v) is supplied. further,
A predetermined sensor 52a of various sensors for automobiles is connected to the outside of the controller between the input terminals 52 and 55, and a predetermined volume 53a of various volumes is connected between the input terminals 53 and 54. Further, the input terminals 56, 57 and 58 are grounded via, for example, operation switches 56a, 57a and 58a such as wiper switches, door locks and lamps.

A regulator 59 is connected to the inside of the controller 50 via an input terminal 51.
This regulator 59 uses 12v from the battery power source B.
Has a function of converting the DC voltage of 5 V into, for example, 5 V and stably supplying it to each component such as a CPU described later. Further, a power cutoff circuit 60 is connected to the input terminal 51. The power cutoff circuit 60 is composed of a PNP transistor 60a and resistors 60b and 60c, and switches the current flowing from the battery power supply B to an input circuit (described later) based on an output signal from a wakeup circuit described later. This is the circuit. The emitter of the transistor 60a is connected to the input terminal 51, the base is connected to the output side of the wakeup circuit via the resistor 60b, and is connected to the input terminal 51 via the resistor 60c.

Further, an input circuit 61 is connected to the input terminals 52 and 53. The input circuit 61 has one end commonly connected to the collector of the transistor 60a and the other end connected to the input terminals 52 and 53, respectively.
a, 61b, resistors 61c, 61d, 61f and A / D
And a converter 61g, which has a function of correcting the voltage level of an input signal from the sensor 52a or the volume 53a to a predetermined level and converting an analog signal value into a digital signal value. A CPU 62 with a standby function is connected to the output side of the A / D converter 61g.

The input terminals 56, 57 and 58 are connected to the input terminals of the CPU 62 via the diodes 63, 64 and 65, respectively. Further, the input terminals of the CPU 62 are connected to the power cutoff circuit 6 via resistors 66, 67 and 68.
0 is commonly connected to the collector side of the transistor 60a, and voltage is applied / not applied to each input terminal of the CPU 62 according to the on / off state of the transistor 60a. Further, the input terminals 56, 57 and 58 are commonly connected to the base of the PNP transistor 73a, which is the input end of the wakeup circuit 72, together with one end of the resistor 72 via the diodes 69, 70 and 71. The other end of the resistor 72 is connected to the input terminal 51, and power is supplied from the battery power source B.

The wake-up circuit 73 includes resistors 73b, 73c, 73d, 73 in addition to the transistor 73a.
e and an NPN transistor 73f, the emitter of the transistor 73a is connected to the battery power supply B via the input terminal 51, the collector is grounded via the resistor 73b, and the transistor 7 is connected via the resistor 73c.
It is connected to the base of 3f. Also, the transistor 7
The base of 3f is grounded together with the emitter through a resistor 73d.

The collector of the transistor 73f has a resistor 7
3e and the input terminal 51 are connected to the battery power supply B, and the transistor 6 in the power cutoff circuit 60 is connected.
It is connected to the base of 0a via a resistor 60b, and is further connected to an interrupt terminal of the CPU 62 via a buffer 74.

The output side of the CPU 62a is connected to loads 80 to 84 such as electrical components via the output interface 62b and output terminals 75 to 79, respectively.

Next, the operations (A) and (B) of this embodiment will be described.

(A) Operation in the operation mode If, for example, only the operation switch 56a among the operation switches 56a, 57a, 58a is in the ON state, the battery power source B side via the resistor 72, the diode 69 and the operation switch 56a. A current flows to the ground side, the potential on the base side of the transistor 73a of the wakeup circuit 73 decreases, and the transistor 73a is in the ON state. Along with this, a current is supplied to the base side of the transistor 73f, so that the transistor 73f is also in the ON state. As a result, the potential on the collector side of the transistor 73f is lowered to the "L" level and the output side of the buffer 74 is set to the "H" level.
The operation mode interrupt is applied to 2a.

On the other hand, when the potential on the collector side of the transistor 73f is at "L" level, the transistor 60a of the power cutoff circuit 60 is on. As a result, the current from the battery power source B is supplied to the input circuit 61 via the transistor 60a, and at the same time, the current is also supplied to the resistors 66, 67, 68 via the transistor 60a. At this time, since the operation switch 56a is on, the current supplied to the resistor 66 flows to the ground side through the diode 63 and the operation switch 56a, and the potential of the input end of the CPU 62a connected to the resistor 66 decreases. Then, it is at "L" level. On the other hand, since the operation switches 57a and 58a are off, the resistance 6
The current from 7, 68 is applied to the operation switches 57a, 58a.
The potential of the input terminal of the CPU 62a connected to the resistors 67 and 68 does not flow to the ground side via the terminal and rises to the "H" level. As a result, the CPU 62a
Detects that only the operation switch 56a provided on the input end side where the potential is lowered is turned on, and performs an operation corresponding to the on state of the operation switch 56a to drive-control the load 80, for example.

(B) Operation in Standby Mode When in such an operation mode, the operation switch 56
When a is turned off, all the operation switches 56a to 58a
Is turned off, and the transistor 7 in the wakeup circuit 73 is supplied by the power supply from the resistor 72.
The potential of the base side of 3a rises, turning off the transistor 73a. Therefore, as a result that the base current of the transistor 73f is not supplied, the transistor 73f is also turned off. Therefore, the potential on the collector side of the transistor 73f rises, and the wakeup circuit 73 outputs an "H" level signal to the interrupt terminal of the CPU 62a via the buffer 74. As a result, the CPU 62a shifts to the standby mode which consumes less power than the operation mode.

Further, the "H" level signal output from the wakeup circuit 73 is also output to the power cutoff circuit 60 as a power stop signal. As a result, the transistor 6
0a is turned off, and the current from the battery power supply B supplied to the sensor 52a, the volume 53a and the input circuit 61 is cut off. As a result, the power consumption in the resistors 61a to 61f, the sensor 52a, the volume 53a, etc. is eliminated, and further, as a result of the transistor 60a being turned off, the power supply to the resistors 66, 67, 68 is cut off. , 68, the power consumption of the route leading from the CPU 62a to the ground side is also eliminated.

The present embodiment has the following advantages.

(1) Among the conventional controllers, since the battery direct connection type controller is not linked to the ignition key, even in the standby mode when control is unnecessary, the battery power source is connected to the ground side through the sensor, the volume and the resistor. A current (dark current) was flowing and power was being consumed. Further, in the controller having a function of controlling the load in accordance with the ON / OFF state of the operation switch, the resistors for detecting the ON / OFF state of the operation switch (the resistors 66, 67, 68 of this embodiment) are directly connected to the resistors. , Power is supplied from the battery power supply. Therefore, a current (dark current) from the battery power source flows out to the ground side of the CPU through the resistor in the form of, for example, a through current, and power is consumed also on this route.

On the other hand, in the present embodiment, in the standby mode, the output of the wakeup circuit 73 is set to the “H” level, the power cutoff circuit 60 is turned off, and the sensor 52a, the volume 53a, the input circuit 61 and the resistor are connected. The current is not supplied to 66, 67 and 68. As a result, the dark current can be reduced by that amount, and the increase in dark current can be suppressed even if the number of input systems such as the sensor, the volume and the operation switch is increased and the scale of the controller is increased. Moreover, in the present embodiment, the larger the controller size, the greater the dark current reduction effect.

(2) Since power is supplied to various controllers without interlocking with the ignition key, it becomes possible to integrate these controllers, and confirm the control status of each controller while confirming the unified load. Drive control is possible.

[0031]

As described above, according to the present invention, an input section to which an input signal from an input component including a sensor or a volume is supplied, and an operation mode when the input signal is supplied, the input mode is set. In a controller having an output section having a central processing unit that goes into a standby mode when all the signals are cut off, a signal output means for outputting a power stop signal in the standby mode, and the input section based on the power stop signal Since the power supply cutoff means for cutting off the power supply to the output unit is provided, the dark current can be further reduced as compared with the conventional one, and the effect of this dark current reduction is the input unit and the output unit. The larger the scale of, the larger.

Further, a plurality of controllers can be integrated and a central processing unit can be shared, which leads to cost reduction, and further integration can be expected to build a more sophisticated control system. Further, the signal output means and the power cutoff means can be provided outside as a main power supply circuit of each controller, in which case the power supply circuit for each controller becomes unnecessary or simplified. Also occurs.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a controller according to the present invention.

FIG. 2 is a diagram showing a configuration example of a conventional vehicle controller.

[Explanation of symbols]

 50 controller 52a sensor 52b volume 60 power cutoff circuit (power cutoff means) 61 input circuit (input section) 63 to 65, 69 to 71 diode (input section) 62a CPU (output section) 62b output interface (output section) 73 Wake-up circuit (signal output means)

Claims (1)

[Claims] 1. An input unit to which an input signal from an input component including a sensor or a volume is supplied, and a central processing unit which becomes an operation mode when the input signal is supplied and becomes a standby mode when all the input signals are cut off. A controller having an output unit having a device, a signal output unit that outputs a power stop signal in the standby mode, and a power cutoff unit that cuts off power supply to the input unit and the output unit based on the power stop signal. A controller characterized by being provided with.