JPH10283581A - Failure diagnostic circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a failure diagnostic circuit which has high precision to specify a failure place and also has high reliability. SOLUTION: This circuit has plural failure detecting circuits 1, when a failure occurs, an IIC-IC 2 which converts voltage from the circuits 1 into data sends data to a microcomputer 3, and the microcomputer 3 shows the failure place on a display device in accordance with the data and also always confirms communication with the IIC-IC 2. When abnormality occurs in the IIC-IC 2 itself or an IIC communication line 5, the abnormality is informed by using the display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis circuit used for electronic equipment such as a television receiver and a display monitor.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional fault diagnosis circuit adjusts the voltage of a fault detection device according to a fault condition, changes the voltage level and the time during which the voltage is input, and inputs the voltage to an input port of a microcomputer. The failure is determined by time at the level of the applied voltage, and the failure is determined by blinking the light emitting diode as a single display device a plurality of times.

In the block diagram shown in FIG.
The voltage from the failed circuit is converted into data using an IC-IC, and the data is input to the input port of the microcomputer.

[0004]

However, in the above configuration, the failure of the IIC-IC itself or
When the C communication line is abnormal, there is a problem that even if another circuit breaks down and voltage is sent from the failed circuit to the IIC-IC, the data is not transmitted to the microcomputer and cannot be recognized by the microcomputer.

[0005] The present invention solves the above-mentioned problems, and improves the reliability of a failure diagnosis circuit.

[0006]

In order to achieve the above object, the present invention has a configuration in which a voltage from a failed circuit is converted into data using an IIC-IC and input to an input port of the microcomputer. -Checking the communication status with the IC. Thus, in the case of a failure of the IIC-IC or an abnormality of the IIC communication line, the abnormal state is indicated, so that the reliability of the failure diagnosis circuit can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a plurality of fault detecting circuits, and when a fault occurs, an IIC which converts a voltage from the fault detecting circuit into data.
-The IC sends data to the microcomputer, and the microcomputer displays the fault location on the display device according to the data, and the microcomputer always checks the communication with the IIC-IC, and sends the fault to the IIC-IC itself or the IIC communication line. Even if there is an abnormality, it is possible to notify the abnormality.

According to a second aspect of the present invention, a plurality of failure detection circuits are provided, and when a failure occurs, a voltage is supplied from the failure detection circuit to an input port of the IIC-IC which converts the voltage into data. Is input, and data is sent from the communication port of the IIC-IC to the microcomputer, and the microcomputer flashes the light emitting diode according to the data to notify the failure location, and the microcomputer always communicates with the IIC-IC. When the abnormality is confirmed and the IIC-IC itself or the IIC communication line has an abnormality, the abnormality is notified using the light emitting diode, thereby improving the reliability of the failure diagnosis circuit.

According to a third aspect of the present invention, a plurality of failure detection circuits are provided, and when a failure occurs, a voltage is input from the failure detection circuit to an input port of the IIC-IC which converts the voltage into data. The data is sent from the communication port of the IIC-IC to the microcomputer, and the microcomputer blinks the light emitting diode according to the data to notify the failure location, and the microcomputer always checks the communication with the IIC-IC, When there is an abnormality in the IIC-IC itself or the IIC communication line, the abnormality is notified by blinking a light emitting diode other than the light emitting diode, thereby improving the reliability of the failure diagnosis circuit.

According to a fourth aspect of the present invention, a plurality of failure detection circuits are provided, and when a failure occurs, a voltage is input from the failure detection circuit to an input port of the IIC-IC which converts the voltage into data. The data is sent from the communication port of the IIC-IC to the microcomputer, and the microcomputer blinks the light emitting diode according to the data to notify the failure location, and the microcomputer always checks the communication with the IIC-IC, When there is an abnormality in the IIC-IC itself or the IIC communication line, the abnormality is notified by voice, thereby improving the reliability of the failure diagnosis circuit.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a failure diagnosis circuit according to an embodiment of the present invention.

(Embodiment 1) FIG. 1 is a block diagram showing an embodiment of a failure diagnosis circuit according to claim 2 of the present invention. In FIG. 1, voltages from a plurality of failure detection circuits 1 are input to an input port of the IIC-IC2.

[0013] The IIC-IC2 is connected to the IIC communication port.
Data indicating from which failure detection circuit the voltage is input is input to the input port of the microcomputer 3, and the microcomputer 3 blinks the light emitting diode 4 a plurality of times in accordance with the input data to notify the failure location. The microcomputer 3 always uses the IIC
-Check the communication with IC2, and check whether IIC-IC2 itself or IIC-IC2
When there is an abnormality in the IC communication line 5, the light emitting diode 4 blinks the number of times corresponding to the failure mode to notify the abnormality of the failure diagnosis circuit itself.

(Embodiment 2) FIG. 2 is a block diagram showing an embodiment of a failure diagnosis circuit according to claim 3 of the present invention. In FIG. 2, voltages from a plurality of failure detection circuits 1 are input to an input port of the IIC-IC2.

[0015] The IIC-IC2 is connected from the IIC communication port.
Data indicating from which failure detection circuit the voltage is input is input to the input port of the microcomputer 3, and the microcomputer 3 blinks the light emitting diode 4 a plurality of times in accordance with the input data to notify the failure location. The microcomputer 3 always uses the IIC
-Check the communication with IC2, and check whether IIC-IC2 itself or IIC-IC2
When there is an abnormality in the IC communication line 5, the light emitting diode 6 different from the light emitting diode 4 is turned on and off to notify the abnormality of the failure diagnosis circuit itself.

(Embodiment 3) FIG. 3 is a block diagram showing an embodiment of a failure diagnosis circuit according to claim 4 of the present invention. In FIG. 3, voltages from a plurality of failure detection circuits 1 are input to an IIC-IC2 input port.
-The IC 2 inputs, from the IIC communication port, the data from which fault detection circuit the voltage was input to the input port of the microcomputer 3, and the microcomputer 3 blinks the light emitting diode 4 a plurality of times in accordance with the input data to determine the fault location. Inform. Further, the microcomputer 3 always checks the communication with the IIC-IC 2 and checks the IIC-IC 2 itself or the IIC communication line 5.
When there is an abnormality, the abnormality of the failure diagnosis circuit itself is notified by voice through the built-in speaker 7.

FIG. 4 is a block diagram showing an embodiment of a failure diagnosis circuit according to claim 1 of the present invention. The display device 8 is replaced with a light emitting diode and a speaker in FIG.
Was provided.

A failure point detection circuit for detecting a failure point is provided, and when a failure occurs, a signal from the failure detection circuit is converted into IIC data (hereinafter referred to as IIC-IC) and inputted to the microcomputer. The failure location is displayed on the display device, and the microcomputer always checks the communication with the IIC-IC, and indicates the abnormality even if the IIC-IC itself or the IIC communication line has an abnormality. And

[0019]

As described above, according to the present invention, it is possible to improve the reliability of the failure diagnosis circuit by always checking the abnormality of the failure diagnosis circuit itself.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a failure diagnosis circuit according to claim 2 of the present invention.

FIG. 2 is a block diagram of an embodiment of a failure diagnosis circuit according to claim 3 of the present invention.

FIG. 3 is a block diagram of an embodiment of a failure diagnosis circuit according to claim 4 of the present invention.

FIG. 4 is a block diagram showing an embodiment of a failure diagnosis circuit according to claim 1 of the present invention;

FIG. 5 is a block diagram of a conventional failure diagnosis circuit.

FIG. 6 is a block diagram of a conventional failure diagnosis circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Failure detection circuit 2 IIC-IC 3 Microcomputer 4 Light emitting diode 5 IIC communication line 6 Light emitting diode 7 Built-in speaker 8 Display device

Claims (4)

[Claims] 1. A microcomputer provided with a failure point detection circuit for detecting a failure point, and using an IC (hereinafter, referred to as IIC-IC) for converting a signal from the failure detection circuit into IIC data when a failure occurs. Input, display the failure location on a display device, and the microcomputer always checks the communication with the IIC-IC,
A failure diagnosis circuit for an electronic device, which indicates an abnormality even when an abnormality occurs in a communication line. 2. A fault detection circuit, comprising: an IIC communication port provided by the failure detection circuit when a failure occurs.
A voltage is sent to an input port of C (hereinafter, referred to as IIC-IC), and the IIC-IC sends data from the IIC communication port to the microcomputer as to which failure detection circuit the voltage is input from, and the microcomputer responds to the data. The failure circuit is indicated by the number of times the light emitting diode blinks, and the microcomputer always checks the communication with the IIC-IC,
If there is an abnormality in the C itself or the IIC communication line, the light emitting diode indicating the faulty circuit is replaced with the IIC-IC.
A failure diagnosis circuit for an electronic device, which blinks according to the failure mode of the electronic device and indicates that the failure diagnosis circuit itself has an abnormality. 3. An IC having a failure detection circuit, wherein the failure detection circuit has an IIC communication port when a failure occurs.
A voltage is sent to an input port of C (hereinafter, referred to as IIC-IC), and the IIC-IC sends data from the IIC communication port to the microcomputer as to which failure detection circuit the voltage is input from, and the microcomputer responds to the data. The failure circuit is indicated by the number of times the light emitting diode blinks, and the microcomputer always checks the communication with the IIC-IC,
If there is an abnormality in the C itself or the IIC communication line, a light emitting diode other than the diode indicating the failed circuit blinks to indicate that the failure diagnosis circuit itself has an abnormality. Fault diagnosis circuit. 4. An IC having a failure detection circuit, wherein the failure detection circuit has an IIC communication port when a failure occurs.
A voltage is sent to an input port of C (hereinafter, referred to as IIC-IC), and the IIC-IC sends data from the IIC communication port to the microcomputer as to which failure detection circuit the voltage is input from, and the microcomputer responds to the data. The failure circuit is indicated by the number of times the light emitting diode blinks, and the microcomputer always checks the communication with the IIC-IC,
A failure diagnosis circuit for an electronic device, which, when an abnormality occurs in C or the IIC communication line, warns by voice that the failure diagnosis circuit itself has abnormality.