KR960009937B1 - Method and apparatus of micom performance - Google Patents

Abstract

generating an output to turning off all LEDs (9) with a LED driver (8) when a LED test switch (SW1) is pressed; outputting a defined signal to a defect detector (3) and a relay driver (4) when an electric control equipment test switch (SW2) is selected; and checking the function of the microcomputer (1) by reducing the output of the microcomputer (1) in proportion to the time.

Description

Microcomputer function test and control electronics defect detection method and device

1 is a control block diagram according to the present invention.

FIG. 2 is a detailed circuit diagram showing a microcomputer, a test key input unit, a fault detection unit, a relay driver unit, and a drive electronic device of FIG.

3 is a flow chart at the time of detecting failure of the electric equipment according to the present invention.

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: test key input unit

3: fault detection unit 4: relay driving unit

5: driving electrical equipment 6: key input unit

7: door open detection unit 8: LED driving unit

9: custom LED10: temperature detection signal processing unit

11: temperature sensing element 12: power supply

R ₇ , R ₈ , R ₉ : Resistor Q ₁ : Transistor

L ₁ to L ₄ : lamps.

The present invention is to test the microcomputer (MICOM: MICRO COMPUTER) to check the presence or absence of important functions in a short time, and to test the electrical equipment driven subordinate to the microcomputer control to detect the failure of the microcomputer function quickly The present invention relates to a method and an apparatus for detecting defective control electronics.

The present invention will be described with reference to an electronic refrigerator driven by a microcomputer control in one embodiment. Conventionally, in order to test the function of the microcomputer to control the refrigerator, the state of the refrigerator had to be monitored for a long time, for example, the cumulative time of the door opening (the function of determining the defrosting time by summing the time that the refrigerator door was opened). 1 hour, pre-cooling (PRECOOL: function to compensate the temperature in the air after defrosting by operating the compressor before the defrost time) function 40 minutes, defrost heater driving time 90 minutes, rest period 7 minutes, freezer fan delay time 5 minutes, sensor detection temperature display time is 8 minutes, refrigeration fan delay time is 5 minutes again.

In addition, a large number of CUSTOM LEDs (light emitting diodes), compressors, heaters, and fans, which are important electric appliances, need to be inspected by a predetermined tester (jig: JIG) in order to check for failures. In addition, there were a lot of difficulties in checking the failure, and there was a problem that the failure site was difficult to find out quickly.

The present invention has been made in view of the above problems.

Accordingly, an object of the present invention is to enable a specific control function of the microcomputer to be tested in a short time so as to quickly determine whether there is a failure, and to quickly determine whether the electronic device to be controlled is a microcomputer function for easy troubleshooting. The present invention provides a method for inspecting and inspecting defective control electronics.

Still another object of the present invention is to provide a control equipment failure detection apparatus capable of testing whether a microcomputer control equipment is defective.

In order to achieve the above object, the present invention provides a function test of a microcomputer and a failure detection method of an electronic device controlled by the microcomputer. When the LED test switch key is input, a predetermined output is performed so that all the custom LEDs are turned on by the LED driver. Process, and when the electric field test switch key is input, it outputs a predetermined signal to the fault detection unit and performs a sequential drive output to the drive electric unit to determine whether the electric field is faulty by turning on or off the lamp provided in the fault detection unit. Process, and when the time-saving test switch key is input, the normal output of the microcomputer can be shortened proportionally and outputted so as to determine whether there is an abnormality of the function.

In addition, in the fault detection device of the control electronics driven by the control of the microcomputer, a test key input unit including an LED test switch, a electrical equipment test switch, a time-saving test switch, and the like to input each specific key is input to the microcomputer input. It is connected, and the fault detection unit consisting of a resistor, a transistor, a lamp is connected to the output port of the microcomputer, one end of the lamp is characterized in that configured to be connected to the inverter output side of the relay driver.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a control block diagram showing the application of the present invention to a refrigerator, and includes a schedule program according to the present invention, a clock function, an A / D converting function (analog-to-digital conversion) function, and the like. One chip microcomputer (1) to be processed, LED test switch, electrical equipment test switch, time-saving test switch, etc. to be described later, and the microcomputer (1) to input a constant key during the functional test or electrical equipment test of the microcomputer (1). The test key input unit 2 and a lamp (LED) corresponding to the electrical equipment (compressor, heater, fan ...) are used to determine whether there is a defect by turning off the lamp (LED) when detecting the failure of the electrical equipment. Fault detection unit (3) that enables to do so, the relay drive unit (4) for driving the electrical equipment, the drive electronics (4) consisting of a compressor, a heater fan, etc. for the temperature setting and clock function of the freezer and refrigerating chamber Ordinary Key input unit 6, door opening detection unit 7 to detect the door opening by the detection of the door switch to use as a calculation variable of the defrost time, and various custom LEDs (9) that are used as many features of the electronic refrigerator (Single LED and LED for number display), an LED driver 8 consisting of a dedicated driver integrated circuit for driving the custom, a temperature sensing element 11 installed in a freezing compartment or a refrigerating compartment for sensing respective temperatures, The temperature sensing signal processing unit 10 converts the sensing of the temperature sensing element 11 into a predetermined signal and inputs it to the microcomputer 1, and the constant DC power supply to the microcomputer 1 and its peripheral circuit. This invention is comprised by the power supply part 12 which supplies AC power.

FIG. 2 is a detailed circuit diagram of important parts of the control block diagram of FIG. 1, such as the microcomputer 1, the test key input unit 2, the fault detection unit 3, the relay driver 4, and the drive electronics 5. Input ports (PI ₁ to PI ₃ ) of the microcomputer (1) include an LED test switch (SW ₁ ), an electrical equipment test switch (SW ₂ ), a shortened test switch (SW ₃ ), a resistor (R ₁ to R ₆ ), A test key input 2 composed of condensers C ₁ to C ₃ is connected, and the output ports PO ₁ of the microcomputer ₁ are resistors R ₇ to R ₉ , transistors Q ₁ , and lamps. The fault detection part 3 consisting of (L ₁ to L ₄ ) is connected, and the inverter (IC) diode (D ₁ to D ₄ ) and the relay (RY ₁ to RY) are connected to the output port PO ₁ of the microcomputer 1. _The relay driver 4 made of 4) is connected, and _one end of the lamps L ₁ to L ₄ of the fault detection unit 3 is connected to the output terminal of the inverter IC, respectively. In addition, the drive electronics 5 such as the compressor CP, the defrost heater HT, the freezer compartment fan FF, and the refrigerating compartment fan RF are driven by energization of the relays RY ₁ to RY ₄ .

3 is a flow chart at the time of fault detection of the load electric component 5.

The operation and effects of the present invention configured as described above will be described with reference to FIGS. 1 to 3.

When power is applied to the circuit according to the present invention, first, the LED test switch SW ₁ of the test key input unit 2 is pressed in order to test whether the custom LED 9 is defective. ) Is input to the input port PI ₁ of the microcomputer 1. Therefore, the microcomputer 1 detects a signal input at this time and outputs a predetermined output to the LED driver 8 so that all the custom LEDs 9 can be turned on.

Therefore, by discovering a custom LED (9) that is not lit at this time, it is possible to easily find a custom LED (9) defective.

In addition, when the electrical test switch SW ₂ of the test key input unit ₂ is turned on and a low signal is input to the input port PI _{2 of} the microcomputer 1, the microcomputer ₁ is low to the output port PO ₁ . Output the signal. Therefore, the output low signal turns on the transistor Q ₁ through the resistor R ₇ , and the collector of the transistor Q ₁ is in a high level state. At the same time, the microcomputer (1) outputs a high signal to the output port (PO ₂₎ wherein the output high signal is inverted through the inverter (IC), is applied to the relay (RY ₁₎ the relay (RY ₁₎ is energized. The compressor CP is thus driven and at the same time the lamp L ₁ is turned on. The third turning According to this not a flowchart showing a process of identifying the compressor (CP) driving and a lamp (L ₁₎ lights up when the Although the indicator lamps (L ₁₎ and drive the compressor (CP) compressor (CP ) Or the relay (RY ₁ ) that drives it. In addition, when a predetermined time (1 second) elapses after driving the compressor CP, the output to the output port PO ₂ is stopped to stop the driving of the compressor CP and the lamp L ₁ , and the same output as described above. Outputs a high signal to the port (PO ₃ ) to drive the defrost heater (HT) and the lamp (L ₂ ), but also outputs the output port (PO ₄ ) (PO ₅ ) to sequentially output the lamp (L ₃ ) (L ₄ ) Turn on or off to determine if there is any defect.

In addition, when a low signal is input to the input port PI ₃ of the microcomputer 1 by turning on the time-saving test switch SW ₃ of the test key input unit 2 to check the function of the microcomputer 1, the microcomputer 1 ) Executes the short-axis control function as shown in the following <Table> according to this low signal input.

[table]

Therefore, the cumulative door open time is detected for 10 seconds from the door open detection unit 7, and the compressor (CP) is driven by reducing the precooling function to 2 seconds to enter the defrost mode, and the defrost heater (HT) is 20 seconds. The drive, rest period 3 seconds, the freezer fan (FF) delay for 3 seconds, the LED (9) to display the sensor temperature for 3 seconds, and performs a shortening function to delay the fan (FF) for 3 seconds again. Therefore, by checking the function of the microcomputer (1) during such a short time, it is determined whether the failure or failure.

As described above, the present invention can easily determine whether there is an abnormality by checking the CUSTOM LED 9 having a plurality of chips (CHIP) without a separate inspection jig.

In addition, the present invention has the advantage that it is easier to operate the function of the control electronics in the actual field to determine the presence of a failure, and anyone can easily determine the abnormality and cope quickly, even if the skilled person.

In addition, when checking the microcomputer (1) function, it is not only a long time but also inefficient to check all of these set functions. However, using the shortcut function has the advantage of improving productivity and saving time.

Claims (2)

In the functional inspection of the microcomputer 1 and the failure detection method of the electrical equipment controlled by the microcomputer 1, when the LED test switch SW ₁ is pressed, all the custom LEDs 9 are turned on by the LED driver 8. A predetermined output is made to be turned on, and when the electric field test switch SW ₂ is input, a predetermined signal is output to the fault detection unit 3, and a sequential drive output is performed to the relay drive unit 4 to perform the fault detection unit 3. ) To determine the failure of the drive electronics 5 by turning on the lamps L ₁ to L ₄ of the lamps), and when the time-saving test switch SW ₃ is pressed, the microcomputer 1 normally operates. Micom function inspection and control electronics defect detection method characterized in that it has a process to determine the abnormality of the function by shortening the output in proportion to the output time. In the failure detection apparatus of the control electric equipment driven by the control of the microcomputer 1, the LED test switch (SW ₁ ), the electrical equipment test switch (SW ₂ ), the time-saving test switch (SW ₃ ), etc. are provided for each specific A test key input unit 2 for inputting a key command is connected to the input of the microcomputer 1, and the resistors R ₇ to R ₉ , the transistor Q ₁ , and the lamp L are connected to the output ports of the microcomputer 1. ₁ to L ₄ ) is connected to the fault detection unit 3, and _one end of the lamp (L ₁ ~ L ₄ ) is configured to be connected to the inverter output side of the relay driver 4, respectively, the control electric field of the microcomputer Water failure detection device.