JP2006100145A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker in which incorrect display can be prevented with a simple constitution, and which has high reliability even when an inexpensive display IC is used. <P>SOLUTION: In the heating cooker to which a display IC 23 driving a main control means 20 of a control part (microcomputer) 39 and a display 6a of a display part 6 is connected by a serial communication, after a synchronizing signal (SCLK) for synchronizing serial communication data by a serial communication means 21 of the main control means 20 is transmitted to the serial communication means 24 of the display IC 23, and the synchronizing signal (SCLK) which has the serial communication means 24 of the display IC 23 is made to be fed back and inputted to an input part of a counter (CNT) 21 of the main control means 20, display data (SI) of the display IC 23 is updated only when the number of transmitted synchronizing signals and the number of synchronizing signals counted by a counter coincide with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooking device using a display IC and a microcomputer.

  For example, in the case of a device configured to display various types of information using a liquid crystal display IC, display data is transmitted to the liquid crystal display IC from a microcomputer (hereinafter referred to as a microcomputer) using a serial communication function. In general, however, the data signal (SO) and the synchronization signal (SCLK) for synchronizing the data input, and the load data for instructing to update the display data when transmission of all data is completed. A data transmission line is composed of three signals (LD). That is, display data is output to SO in synchronization with SCLK bit by bit, and when all display data has been transmitted, it is displayed on the liquid crystal display IC by a load data signal (LD).

Also, although it is a general electric device, two microcomputers are prepared to detect whether data by serial communication is correctly performed, and the same data is transmitted twice, and it is determined whether the received data of the two matches. A method or a method such as obtaining an integrated value / exclusive OR data of received data and determining whether or not the integrated value / exclusive OR data coincides (see, for example, Patent Document 1). .
JP 2000-70590 A

  In consumer electronics products that require low cost, an inexpensive liquid crystal display IC has only a simple communication function and does not have the above-described function for checking data consistency. As a result of erroneous synchronization signal being input to the display IC, erroneous data such that the bit position has shifted may be displayed as legitimate display data, and a home electric appliance having a function capable of accurate display is desired. It had been. Accordingly, an object of the present invention is to provide a highly reliable cooking device that can prevent erroneous display with a simple configuration even when an inexpensive display IC is used.

  In order to solve the above problems, a cooking device according to claim 1 of the present invention is a cooking device in which a main control means of a control unit and a display IC that drives a display unit of a display unit are connected by serial communication. A means for determining the synchronization of serial communication data is provided only on the main control means side, and a means for updating display data is provided on the display IC of the display unit.

  The cooking device according to claim 2 of the present invention is a cooking device in which a main control means of the control unit and a display IC for driving the display unit of the display unit are connected by serial communication, and the main control means has serial communication. Means and a counter, the serial control data synchronization judgment is made only on the main control means side based on the counting result of the counter, and the display IC of the display unit has serial communication means and updates the display data. The configuration was provided.

  In this way, even when an inexpensive display IC is used, it is only necessary to provide a means for determining the synchronization of serial communication data only on the main control means side of the control unit, so that erroneous display can be prevented with a simple configuration and high reliability. A cooker can be provided.

  The cooking device according to claim 3 of the present invention is a cooking device in which a main control unit of the control unit and a display IC that drives the display unit of the display unit are connected by serial communication. A synchronization signal (SCLK) for synchronizing serial communication data is transmitted to the serial communication means of the display IC, and the synchronization signal (SCLK) reaching the serial communication means of the display IC is sent to the counter (CNT) of the main control means. The display data (SI) of the display IC is updated only when the number of transmitted synchronization signals and the number of synchronization signals counted by the counter coincide with each other by feedback input to the input unit.

  In this way, by repeating the control sequence for judging whether the display is correct each time the display is changed, for example, it is possible to detect whether or not the external noise is superimposed on the transmission line, so that even when an inexpensive display IC is used for a home appliance. With a simple configuration, erroneous display can be prevented and a highly reliable cooking device can be obtained, which can contribute to cost reduction of the product.

  A cooking device according to a fourth aspect of the present invention is the cooking device according to the first to fourth aspects, wherein the control unit is constituted by a microcomputer.

  As described above, the heating cooker of the present invention can detect whether or not the external noise is superimposed on the transmission line by repeating the control sequence for determining whether the display is correct each time the display is changed. Even when an inexpensive display IC is used for the product, erroneous display can be prevented with a simple configuration, and a highly reliable cooking device can be obtained, which can contribute to cost reduction of the product.

  An embodiment of a heating cooker according to the present invention will be described with reference to FIGS. FIG. 1 is an example of a heating cooker according to the present invention, FIG. 1 (A) is an external perspective view of the built-in heating cooker, and FIG. 1 (B) is a view when the built-in heating cooker is incorporated into a household sink. It is an external view.

  In FIG. 1A, 1 is a main body of a built-in heating cooker, 2 is a top frame placed on the upper surface of the main body 1, 3 is a ceramic top plate attached to the top frame 2, and 4 is It is a ventilation part which provided the inlet and the exhaust to the inside of the main body 1 provided in the top plate frame 2 rear part. The ventilation part 4 detachably accommodates a ventilation cover 4a having a large number of punching holes. The internal control unit and the induction heating coil are cooled by the intake air from the ventilation unit 4. In the present invention, the front of the top frame 2 is a side portion of the top frame 2 on the user side when the main body 1 is incorporated in a sink 18 to be described later and used by the user, and the rear portion. Is the opposite front side, that is, the side farthest from the user.

  Reference numeral 5 denotes a top panel operation unit provided on the front side of the top panel frame 2, and 6 denotes a display unit provided on the front center part of the top plate 3. 7 is a roaster unit having a cooking chamber at the rear, and 8 is a door of the roaster unit 8. 9 is an operation part, 10 is an output setting part of the induction heating part in the operation part 9, 11 is a timer setting part for performing timer operation, and 12 is a power switch.

  The display unit 6 is disposed below the top plate 3, the top plate 3 facing the display unit 6 is formed transparent, and the user can see the display unit 6 through the top plate 3. Has been.

  Reference numerals 13 and 14 are induction heating portions drawn on the top plate 3 by printing, and 15 is a heater heating portion drawn by printing the radiant heater position. An induction heating coil (not shown) for induction heating the cooking pan placed on the top plate 3 is disposed correspondingly below the induction heating units 13 and 14, and below the heater heating unit 15. The radiant heater which heats the cooking pan placed on the top plate 3 with a heater is arranged correspondingly. An output display unit such as an LED that displays the output of the induction overheating unit 13 and an output display unit such as an LED that displays the output of the induction overheating unit 14 are also arranged.

In the main body 1, the top plate 3 is exposed to the top plate portion 16 a of the sink 16, as shown in FIG. 1B, in a recess provided in the sink 16 usually installed in the kitchen of the home. In addition, the loin stub 3 and the operation unit 9 are assembled so as to face the side 16b of the sink 16. In addition, the size of the sink 16 is uniform so that a gas stove can be replaced and incorporated.

  Further, the display unit 6 shown in FIG. 2 is arranged at a substantially front center portion on the top plate 3. And it has the 1st display part 6a formed in the vicinity of the top-panel frame 2 with one liquid crystal display element, and the 2nd display part 6b arrange | positioned behind this 1st display part 6a. The first display section 6a displays the state of induction heating in the induction heating sections 13 and 14. Specifically, in the center, a mode display unit 61 that displays the current heating mode, that is, heating, kettle, heat insulation, fried food cooking, fried food cooking with a small amount of oil, and positions corresponding to each mode on the left and right of the mode display unit 61 Mode indication units 62 and 63 each having a triangular mark. The mode instruction unit 62 displays the current operation mode of the induction heating unit 13 by turning on a triangle (other triangles are turned off), and the mode instruction unit 63 induces the current operation mode of the induction heating unit 14. It is displayed in the same manner as the heating unit 13.

  The first display unit 6a further includes a setting display unit 64 that displays the current output set value of the induction heating unit 13 or a set temperature in the fried food cooking mode on the upper left side of the mode instruction unit 62, and the setting display unit. A timer time display unit 65 that displays the remaining time when the timer of the induction heating unit 13 is set is displayed in the lower part of 64, and the current output setting value of the induction heating unit 14 or cooking of the deep-fried food further in the upper right part of the mode instruction part 63. In the mode, a setting display unit 66 that displays a set temperature, and a timer time display unit 67 that displays a remaining time when the timer of the induction heating unit 14 is set, are provided below the setting display unit 66.

  Further, the second display unit 6b has a heater setting display unit 68 for displaying the driving state and setting output of each heater of the radiant heater and the roaster unit 7 on the side close to the first display unit 6a, and white motion cooking of the roaster unit 7. A menu display unit 69 is arranged. The automatic cooking menu display unit 69 is configured to display an instruction on the currently executed menu by turning on an LED or the like from below.

  FIG. 3 is a control block diagram of the built-in heating cooker of the present invention. 30 has an induction heating coil (not shown), an induction heating control unit for induction heating the cooking pan placed on the induction heating unit 13 printed on the top plate 3, and 31 also uses an induction heating coil (not shown). Then, an induction heating control unit that induction-heats the cooking pan placed on the induction heating unit 14 printed on the top plate 3, 32 cannot induction heating the cooking pan placed on the induction heating units 13 and 14, for example, In the case of an aluminum pan or earthenware pan, or the presence of small items that do not want to be heated undesirably because they have been placed inadvertently, such as forks and knives, the current flowing in the induction heating control units 30 and 31 is detected, and heating is detected. It is a load detection unit that stops driving the induction heating control unit 30 or 31 when it is determined to be inappropriate.

  Reference numeral 33 denotes a radiant heater disposed below the heater heating unit 15, 34 a roaster heater, which is a general term for a flat heater and a lower heater, and 35, which is disposed in the main body 1 and sucks from the ventilation unit 4 to be described later. It is a cooling fan that cools the coil and the like and exhausts it again from the ventilation part 4. Reference numeral 36 denotes an IH thermistor group arranged on each induction heating coil below the top plate 3, 37 is a roaster thermistor which is attached to the outer side wall of the cooking cabinet and detects the temperature in the cooking cabinet, and 38 is a control unit which will be described later. A board thermistor group for detecting the temperature on the printed circuit board on which the power is mounted, the temperature of the power switching elements and diode bridges used in the induction heating control units 30 and 31, and the control unit 39 made of a microcomputer are: 5, based on instructions from the operation unit 9, information from the IH thermistor group 36, the roaster thermistor 37, and the substrate thermistor 38, the induction heating control units 30, 31, the radiant heater 33, the roaster heater 34, the cooling fan 35, etc. A control unit 40 that outputs an instruction and controls driving, and 40 is a control power unit that forms a control power source from a commercial power source and supplies it to the control unit That. The induction heating control units 30 and 31 and the radiant heater 33 are also collectively referred to as a heating unit.

  The power switch 12 is disposed between the control power supply unit 40 and the commercial power supply, and further comprises a catalyst heater 41, an exhaust fan 42, induction heating control units 30, 31, a radiant heater 33, a roaster heater 34, and a cooling fan 35. Is branched from a power supply line between the power switch 12 and the control power supply unit 40, and power is supplied to each component. Therefore, when the power switch 12 is turned off, all the power supplies are turned off.

  The induction heating coil of the induction heating control unit 30 and the induction heating coil of the induction heating control unit 31 are provided with the thermistors constituting the IT thermistor group 36 at the central part and the part where the magnetic field of the induction heating coil becomes strong. The temperature of the cooking pan placed on the top plate 3 is detected via the top plate 3 to indirectly detect the temperature of the food in the cooking pan.

  FIG. 4 shows a connection configuration between the main control means of the control unit of the heating cooker of the present invention and the display IC of the display unit. The control unit 39 is configured by a microcomputer, and the control unit 20 is incorporated in the control unit 39 as a functional unit. The main control means 20 has serial communication means 21 and a counter 22, and the display IC 23 that drives the display of the display unit 6 has serial communication means 24.

  The serial communication means 21 of the main control means 20 commands to update the synchronization signal (SCLK) for synchronizing the serial communication data, the display data (SI) of the display IC, and the display data (SI) of the display IC. The loading data signal (LD) to be transmitted is transmitted to each input terminal of the serial communication means 24 of the display IC 23 via a signal line. The synchronization signal (SCLK) that has reached the serial communication means 24 of the display IC 23 is fed back to the counter 22 of the serial communication means 21 of the main control means 20 through a feedback line.

  Each signal is shown in FIG. The synchronization signal (SCLK) is a pulse at equal intervals, and is a signal for determining a display address. The display data (SI) is a signal that is input to the display IC that drives the display and indicates the content of the display. If the loading data signal (LD) is valid data, the display data (SI) to be updated is a signal for instructing updating to the address of the correct synchronization signal (SCLK).

  With such a configuration, the serial communication means 24 of the display IC 23 that drives the display of the display means generates a synchronization signal (SCLK) for synchronizing serial communication data from the serial communication means 21 of the main control means 20 of the control unit. To send to. The synchronization signal (SCLK) that has reached the serial communication means 24 of the display IC 23 is fed back to the input section of the counter (CNT) 22 of the main control means 21.

  The counter function of the counter (CNT) 22 counts the returned synchronization signal (SCLK) signal. If the value is different from the value of the transmitted synchronization signal (SCLK) signal, the synchronization signal (SCLK) is caused by external noise or the like. It is determined that an abnormal signal is superimposed on the signal during transmission. In this case, the main control means 20 does not send a loading data signal (LD). Since the LD signal is not sent, the display IC does not update the display and continues to display the previous display.

  As described above, the serial communication unit 21 of the main control unit 20 does not transmit the loading data signal (LD), but initializes the counter (CNT) 22 again, and then repeatedly transmits all data. The loading data signal (LD) is transmitted only when the number of synchronized signals and the number of synchronized signals counted by the counter (CNT) 22 match and are regarded as valid data, and the display IC displays the display data ( Command to update SI).

  FIG. 6 is a sequence flow diagram by a program built in the main control means 20 of the control unit of the present invention. First, after preparing the data to be transmitted, this program is called, control is started in step S0, and the counter (CNT) 22 is initialized in step S1. In step S2, the serial communication means 21 starts transmitting serial communication data.

  In step S3, it is determined whether or not the transmission of the serial communication data is completed. If the transmission is not completed (N), the transmission is further continued. If the transmission of the serial communication data is completed (Y), the process proceeds to step 4 of the next stage, the counter function of the counter (CNT) 22 counts the returned synchronization signal (SCLK) signal, and the numerical value is transmitted. It is determined whether or not it matches the numerical value of the synchronization signal (SCLK) signal.

  If they do not match (N), it is determined that an abnormal signal is superimposed on the synchronization signal (SCLK) signal due to external noise or the like during transmission, and the main control means 20 does not send the loading data signal (LD). . Then, the process returns to step S1, and after the counter (CNT) 22 is initialized again, the transmission of all data is repeated.

  If it is determined in step S4 that the number of transmitted synchronization signals matches the number of synchronization signals counted by the counter (CNT) 22 (Y), it is regarded as valid data, and the process proceeds to the next step S5. The main control means 20 transmits a loading data signal (LD) to the display IC 23, and the control ends at step S6.

  Such a control sequence is repeated every time the display is changed, and for example, it is possible to detect whether or not the external noise is superimposed on the transmission line, so that display of erroneous data can be prevented.

The embodiment figure of the cooking-by-heating machine of the present invention. The enlarged view of the display part of the heating cooker of this invention. The control block diagram of the built-in heating cooker of this invention. The connection block diagram of the main control means of the control part of a heating cooker, and the display IC of a display part. Synchronization signal (SCLK), display data (SI), and loading data signal (LD). The sequence flow figure by the program built in the main control means 20 of the control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Built-in heating cooker body 3 Top plate 6 Display part 7 Roaster part 8 Door 9 Operation part 13,14 Induction heating part 15 Heater heating part 16 Sink 20 Main control means 21 Serial communication means 22 Counter 23 Display IC
24 serial communication means 30, 31 induction heating control unit 32 load detection unit 36 IH thermistor group 39 control unit (microcomputer)
40 Control power supply 61, 62,
63 Mode indication section 64, 66 Setting display section 65, 67 Timer time display section

Claims (4)

In the cooking device in which the main control unit of the control unit and the display IC that drives the display unit of the display unit are connected by serial communication, a unit for determining synchronization of serial communication data is provided only on the main control unit side. A cooking device, wherein the display IC is provided with means for updating display data. 2. The main control means includes serial communication means and a counter, and the display IC includes serial communication means, and serial communication data synchronization determination is performed based on a counting result of the counter. Cooking device. In a cooking device in which the main control means of the control unit and the display IC that drives the display unit display are connected by serial communication, a synchronization signal (SCLK for synchronizing serial communication data from the serial communication means of the main control means) ) Is transmitted to the serial communication means of the display IC, and the synchronization signal (SCLK) that has reached the serial communication means of the display IC is fed back to the input section of the counter (CNT) of the main control means, and the number of transmitted synchronization signals Only when the number of synchronization signals counted by the counter matches, the display data (SI) of the display IC is updated. The cooking device according to any one of claims 1 to 4, wherein the control unit is constituted by a microcomputer.

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