JPS6039208A - Microcomputer control system of high frequency heater - Google Patents

Abstract

PURPOSE:To execute the diagnosis of the entire system by inputting plural switches of a keyboard switch according to the specific order so as to conduct check function of an electronic circuit. CONSTITUTION:A switch group of the keyboard switch 2 is arranged on a matrix of 6X6 comprising six inputs I1-I6 and six output circuits theta1-theta6 in a microcomputer 1. In order to execute the check routine for the state of the computer 1 from the normal operating state, five switches in hatched lines among the switch groups are inputted in the order to ''cancellation''-''weakening''-27-28- ''strengthening''. Thus, the diagnosis as the entire system is conducted without preparing any special measuring device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-test function in a microcomputer control/stem of a high frequency heating device.

Conventionally, this type of microcomputer control/system inspection has been performed by inspecting the control board, but the method for doing this is to attach the board to various inspection devices and observe the voltage and signals during operation. This is done in the form of diagnosing whether the circuit condition is correct or not. However, this method requires a specific inspection device having the above-mentioned functions, and has the disadvantage that inspection cannot be carried out easily. There was also the problem that the inspection was limited to a single board, making it impossible to diagnose the entire control system.

The present invention has been made in order to improve such conventional drawbacks, and is to newly provide the microcomputer control system of the high-frequency heating device with a self-diagnosis function.

The principle and one specific embodiment of the present invention will be explained below.

In order to add a new diagnostic function to a microcomputer, which is the central part of a control/system, it is necessary to create a test-specific program in addition to the normal program, but what must be considered here is safety. From this point of view, it is necessary to prevent confusion between the two programs, and it is therefore essential that the test program does not operate when one copy n0 is in use. Therefore, the test program must be executed using inputs that would be unthinkable under normal conditions.

The present invention is characterized in that this testing program is executed by specific input from a keyboard switch connected to a microcomputer.

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, reference numeral 1 represents a microcomputer, and reference numeral 2 represents a keyboard switch comprising a plurality of switch groups connected to the microcomputer. R1-R in microcomputer 1
2-R3''-+Rn-tt simply shows the routine executed in the normal operating state, which causes the microcomputer 1 to output a display signal to the fluorescent display tube, /, outputting a control signal O to a control circuit 4 of a heating device such as a heater, and determining input of a temperature signal T from a temperature sensor 5, etc.

On the other hand, if the keyboard switch 2 performs N key JS (SIS) in a specified order, the microcomputer will 1 is DRl-DR2-DR3 from the state in which the above routine is executed.
-+DRm - The state shifts to a state where the inspection routine indicated by DR4 is executed. That is, when the key manual SN is read in R1, the process shifts to DR.

The microcomputer 1 has individual inspection functions according to each part of the control/stem to be inspected, and a key human power for selecting and executing each of these multiple inspection functions K11-1 is defined. . By manually pressing these keys, each individual test is executed, and depending on the content of the test, the display signal or output of the control signal O or the input judgment of the temperature signal T is performed to diagnose each part. It is.

FIG. 2 shows the appearance of the panel section of a high-frequency heating device employing the principles of the present invention, and FIG. 6 shows the keyboard switch 2 and microconopiter 1. ! : shows the connections, and the switch group of the keyboard switch 2 is connected to the six inputs 11 to I6 of the microcomputer 1 and 0. -06 are arranged on a 6×6 matrix composed of six output circuits. Of these switch groups, five keys shaded in FIG. 2 are used to shift the state of the microcomputer from the normal operating state to the testing routine execution state.

We will not proceed with the state transition. At this time, if the manual order is wrong or if the wrong keys are manually used, this will not be possible. Since such input means are not normally used, there is no confusion with normal programs.

9. The microcomputer 1 has seven inspection functions depending on the object to be inspected. Selection and execution of these functions are performed manually using keys "1" to "7", and each test is executed immediately by inputting these keys after transition to the test state.

As is clear from the above description, the present invention operates the self-diagnosis function of the microcomputer using a keyboard switch installed in the panel, so that the conventional external device, which has been stuck testing the board, Compared to conventional methods, this method not only simplifies inspection, but also has the unprecedented feature of being able to inspect finished work as a product.
In this respect, it has become possible to diagnose the entire system. In addition, considering serviceability, it is possible to analyze the failure location without using special measuring equipment or disassembling the product, and it can be said that the system is even better than conventional systems. In particular, since the test program is executed by inputting a plurality of switches in a prescribed order, there is no confusion with a normal program.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, which is a simplified explanation of the operation of a microcomputer, FIG. The figure is an explanatory diagram showing the connection between the keyboard switch and the microcomputer. 1. Microcomputer. 2...Keyboard switch. Applicant: Hitachi Thermal Appliances Co., Ltd.

Claims (1)

[Claims] A microcomputer (1) and a keyboard switch (2) consisting of a group of switches connected to the microcomputer in a matrix,
The microcomputer is newly provided with a test function for testing the electronic circuit, and the test function is executed by manually operating a plurality of switches of the keyboard switch in a prescribed order. Microcomputer control/stem for high frequency heating equipment.