JP6637739B2 - Operation switch operation detection circuit and heating cooker provided therewith - Google Patents

Description

  The present invention relates to a circuit for detecting operation of an operation switch and a heating cooker provided with the circuit.

  When a circuit for detecting that a plurality of operation switches are operated is configured by a so-called static circuit for detecting an operation on each operation switch via an individual input line connected to the operation switch, the number of signal lines is Only the number of operation switches is required. Therefore, the present applicant has developed a technology in which the circuit is configured as a so-called dynamic circuit, and the number of signal lines can be reduced as compared with the number of operation switches (for example, see Patent Document 1).

JP 2012-112576 A

  In the dynamic circuit, when the number of output lines provided in the control unit is m and the number of input lines is n, the operation of m × n operation switches can be detected and the control unit and the operation unit are connected. The number of signal lines (that is, the sum of input lines and output lines) is m + n.

  On the other hand, in a static circuit, in order to detect the operation of m × n operation switches, the number of signal lines connecting the control unit and the operation switches needs to be m × n, which is the same as the number of operation switches. Becomes In short, when the operation of m × n operation switches is detected, when m × n> m + n, the operation switch operation detection circuit is configured by the dynamic circuit as compared with the case where the operation switch operation detection circuit is configured by the static circuit. In this case, the number of signal lines connecting the control unit and the operation switches can be reduced.

  Then, it has been desired to further reduce the number of signal lines, in other words, to connect more operation switches to the same number of signal lines as the dynamic circuit shown in Patent Document 1.

  The present invention has been made in view of the above-mentioned conventional problems, and provides a circuit for detecting the operation of an operation switch, which is constituted by a so-called dynamic circuit and can further reduce the number of signal lines, and a heating cooker provided with the circuit. The task is to do so.

  In order to solve the above-mentioned problem, a circuit for detecting operation of an operation switch according to claim 1 of the present invention includes a plurality of output terminals and a plurality of input terminals, and outputs a test signal having a predetermined pulse width to the output terminal. A control unit for detecting the inspection voltage input to the input terminal, a plurality of output lines respectively connected to the output terminal, a plurality of input lines respectively connected to the input terminal, and the input line A voltage source connected to the output line and the input line via a resistor, and a switch lead connected between the output line and the input line. The switch lead is turned on only when the switch is operated and turned off when the operation is stopped. And an operation switch, which is a main body, and between each of the output lines and each of the input lines, an operation switch can be installed where the switch conductor and the operation switch can be installed, respectively. A plurality of switch conductors and the operation switch connected between the corresponding output line and the input line are provided in the operation switch installable location, and the plurality of switch conductors have different switch resistances. A body is provided in series with the operation switch.

  An invention according to claim 2 is a heating cooker provided with the operation switch operation detection circuit according to claim 1, wherein the heating unit; a control unit that controls start and stop of heating by the heating unit; A stop command operation unit for inputting a heating stop command to the control unit to the heating unit, and the switch resistor provided in series with the operation switch corresponding to the stop command operation unit. The resistance value is the lowest resistance value among all the switch resistors.

  In the operation switch operation detection circuit according to claim 1 of the present invention, it is possible to connect more operation switches to the same number of signal lines as in the conventional dynamic circuit.

  In the cooking device according to claim 2 of the present invention, the impedance between the output line and the input line to which the operation switch corresponding to the stop command operation unit is connected is reduced, and the operation of the operation switch is detected. Even when noise is applied to the circuit for use, the occurrence of erroneous detection is suppressed, and a command to stop heating by the heating unit can be appropriately input to the control unit, thereby providing a safe cooking device. It becomes possible.

1 is a perspective view showing a kitchen counter in which a cooking device provided with a circuit for detecting operation of an operation switch of the present invention is incorporated, and in which an operation section of the cooking device is drawn out. 1 is a perspective view showing a kitchen counter in which a cooking device provided with a circuit for detecting operation of an operation switch of the present invention is incorporated, and in which an operation section of the cooking device is housed. It is a perspective view of a cooking device provided with a circuit for operation detection of an operation switch of the present invention. FIG. 3 is a configuration diagram of an operation detection circuit of an operation switch. FIG. 3 is a configuration diagram of an operation detection circuit of an operation switch in which only an operation switch SW1 is ON. 5 is a time chart showing output to an output terminal and input from an input terminal when only an operation switch SW1 is ON. FIG. 3 is a configuration diagram of an operation detection circuit of an operation switch in which only an operation switch SW2 is ON. 6 is a time chart showing output to an output terminal and input from an input terminal when only the operation switch SW2 is ON. FIG. 3 is a configuration diagram of an operation detection circuit of an operation switch in which only the operation switches SW1 and SW2 are ON. 6 is a time chart showing output to an output terminal and input from an input terminal when only the operation switches SW1 and SW2 are ON. It is a block diagram of the circuit for operation detection of the operation switch of another example. 9 is a time chart showing output to an output terminal and input from an input terminal when only an operation switch SW1 of another example is ON.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  In the present embodiment, the heating cooker 2 provided with an operation detection circuit of the operation switch is a gas stove as shown in FIG. 1, and a main body portion in which three stove burners are arranged side by side as a heating unit 4. , The top plate 3 and the operation unit 6 as main parts.

  The main body is suspended from the opening of the countertop 11 of the kitchen counter 1 and is assembled to the countertop 11. The heating cooker 2 of the present embodiment is a so-called built-in type, but may be of a non-built-in type.

  The top plate 3 is mounted so as to cover the main body attached to the counter top 11 and to make the peripheral portion abut on the upper surface of the counter top 11. In addition, on the top of the top plate 3, there are three stove burners. In contrast, Gotoku 5 is equipped.

  The main body is mounted at a position largely retreated behind the front edge 11a of the countertop 11, and the top plate 3 is mounted so as to cover the mounting portion of the main body. The front part of the work surface 12 constitutes the cooking work surface 12.

  The operation unit 6 is formed in a horizontally long strip shape, and has, on an upper surface thereof, a plurality of individual operation units for performing operations such as ignition and extinguishment of three stove burners and adjustment of thermal power.

  In order to form the cooking work surface 12 as described above, the main unit and the top plate 3 are mounted at a position retracted rearward from the front edge 11a of the countertop 11, whereas the operation unit 6 is mounted. Is mounted on the front edge side 11a of the kitchen counter 1.

  Specifically, the operation unit 6 can be freely moved between a storage position (see FIG. 2) that is stored below the countertop 11 and a protruding position (see FIG. 1) that protrudes forward from the countertop 11. In a state where it is supported and located at the protruding position, operations such as ignition and extinguishing of the three stove burners and adjustment of the thermal power can be performed (see FIG. 3).

  Although not shown, by slightly pushing the operation unit 6 located at the storage position rearward, the operation unit 6 is automatically moved to the projecting position, and the operation unit 6 located at the projecting position is moved. An operation unit holding mechanism is provided for automatically holding the operation unit in the storage position by pressing the storage unit in the storage position.

  As shown in FIG. 3, a power supply operation unit 7 is provided at a position on the front side of the kitchen counter 1 on the side of the operation unit 6, and the operation unit 6 is stored in the storage position to burn the stove burner. When the stove burner is extinguished in this state, the stove burner can be extinguished by pushing and operating the power supply operation unit 7. By the way, if the power supply operating unit 7 is pushed in a state where the stove burner is burning, all the ignited ones among the three stove burners will be extinguished.

  The control unit is provided in the main unit, and the operation detection circuit detects that each individual operation unit that performs operations such as ignition and extinguishment of the three stove burners and adjustment of the thermal power is operated by the operation detection circuit. The circuit for use has a configuration using a so-called dynamic circuit described later. The control unit includes, for example, a microcomputer. The control unit of the heating cooker 2 may have the same function as in the present embodiment, or may be provided separately, and is hereinafter simply referred to as a control unit.

  The control unit has a plurality of output terminals and a plurality of input terminals. In the present embodiment shown in FIG. 4, two control terminals (COM1, COM2) and two input terminals (DAT1, DAT2) are provided. , But the number of output terminals and input terminals is not particularly limited. Then, an inspection signal having a predetermined pulse width is output to the output terminals COM1 and COM2, and the inspection voltage input to the input terminals DAT1 and DAT2 is detected.

  Output terminals COM1 and COM2 are connected to output lines o1 and o2, respectively, and input terminals DAT1 and DAT2 are connected to input lines i1 and i2, respectively. It is preferable that the output lines o1, o2 and the input lines i1, i2 are respectively connected to the output terminals COM1, COM2 and all the input terminals DAT1, DAT2 included in the control unit, but this is not necessary. Voltage sources V1 and V2 are connected to the input lines i1 and i2 via resistors R1 and R2, respectively. In the present embodiment, the voltage values of the voltage sources V1 and V2 are 5 V, and the resistance values of the resistors R1 and R2 are 7.5 kΩ, but are not particularly limited.

  Then, between any one output line and any one input line are operation switch installation places G1 to G4 where switch conductors and operation switches SW1 to SW8 can be installed, respectively. That is, when the number of output lines is m and the number of input lines is n, there are m × n places where operation switches can be installed. In the present embodiment, as shown in FIG. 4, the number of output lines is two (m = 2) and the number of input lines is two (n = 2). m × n = 2 × 2) exists. It is preferable that switch conductors and operation switches SW1 to SW8 are installed in all operation switch installable locations, but it is not necessary. In the present embodiment, as shown in FIG. 4, switch conductors and operation switches SW1 to SW8 are installed in all the operation switch installable locations G1 to G4.

  One end of the switch conductor is connected to the output lines o1 and o2, the other end is connected to the input lines i1 and i2, and operation switches SW1 to SW8 and switch resistors SR1 to SR8 are provided on the way. The operation switches SW1 to SW8 correspond to the individual operation units provided in the operation unit 6, respectively. The operation switches SW1 to SW8 are switches only while the individual operation unit performs an operation such as a push operation. A tact switch which is a momentary operation type switch which is turned on and turned off when the operation is stopped is used. The switch resistors SR1 to SR8 are provided on the switch conductors in series with the operation switches SW1 to SW8. In the present embodiment, the resistance values of the switch resistors SR1, SR3, SR5, and SR7 are 10 kΩ, and the resistance values of the switch resistors SR2, SR4, SR6, and SR8 are 4.7 kΩ, which will be described later.

  Further, in this embodiment, as shown in FIG. 4, diodes D1 to D8 each having an anode connected to the input lines i1 and i2 and a cathode connected to the output lines o1 and o2 are provided in each switch conductor. When the plurality of operation switches SW1 to SW8 are simultaneously operated, the diodes D1 to D8 cause a current to flow through the operation switches SW1 to SW8, thereby erroneously detecting the operation of the operation switches SW1 to SW8. This is to prevent the backflow at the time of simultaneous pushing for preventing.

  The basic operation of the dynamic circuit will be described.

  The control unit outputs a test signal to each of the plurality of output lines o1 and o2 at different times, and the input lines i1 and i2 to which the test signal has been input and the output lines o1 and o2 that output the test signal at this time. It is detected from which combination the operation switches SW1 to SW8 arranged in any of the operation switch installable places G1 to G4 are operated.

  Specifically, first, High (5 V in this embodiment) is output to COM1 as a test signal, and Low (0 V in this embodiment) is output to COM2. At this time, if all the operation switches SW1 to SW8 are OFF, 5 V is input to DAT1 and DAT2. Even if any of the operation switches SW5 to SW8 is turned on and the rest of the operation switches SW1 to SW8 are turned off, 5 V is input to DAT1 and DAT2.

  As one of the operation switches SW1 to SW4, for example, when the operation switch (SW1 or SW2) of the operation switch installable portion G1 is turned on and the remaining operation switches SW3 to SW8 are turned off, the DAT1 is set to an intermediate voltage of 0 to 5V. 5V is input to the value, DAT2.

  As a result, the operation switch (SW1 or SW2) provided at the operation switch installable portion G1 between the input line i1 of COM1 and the output line o1 of DAT1 is turned on, and the other operation switch installable portions G2 to G4 are provided. It is recognized that the provided operation switches SW3 to SW8 are OFF.

  Similarly, when High is output to COM1 and Low is output to COM2, and when an intermediate value of 5V is input to DAT1 and 0 to 5V is input to DAT2, an operation switch ( SW3 or SW4) is ON, and it is recognized that the operation switches SW1, SW2, SW5 to SW8 provided in the other operation switch installable locations G1, G3, G4 are OFF.

  In addition, when Low is output to COM1 and High is output to COM2, an intermediate value of 0 to 5 V is input to DAT1, and when 5V is input to DAT2, the operation provided in the operation switch installable location G3 is performed. It is recognized that the switch (SW5 or SW6) is ON and the operation switches SW1 to SW4 and SW7 to SW8 provided in the other operation switch installable locations G1, G2, G4 are OFF.

  In addition, when Low is output to COM1 and High is output to COM2, and an intermediate value of 5 V is input to DAT1 and 0 to 5 V is input to DAT2, the operation switch (SW7 Alternatively, it is recognized that the switch SW8) is ON and the operation switches SW1 to SW6 provided in the other operation switch installable locations G1 to G3 are OFF.

  As shown in FIG. 6, High of a predetermined pulse width is output to COM1 and Low of a predetermined pulse width is output to COM2. Thereafter, Low of a predetermined pulse width is output to COM1 and a predetermined pulse is output to COM2. The width High is output, and this is repeated.

  Then, after it is recognized which of the operation switches SW1 to SW8 provided in the operation switch installable locations G1 to G4 has been turned on, it is recognized which of the operation switches SW1 to SW8 has been turned on. is there. In this case, it is recognized which of the operation switches SW1 to SW8 has been turned ON based on the magnitude of the intermediate value of 0 to 5 V input to DAT1 or DAT2.

  For example, when High is output to COM1 and Low is output to COM2 and an intermediate value of 0 to 5 V is input to DAT1 and 5 V is input to DAT2, first, the operation switch (SW1) provided in the operation switch installable location G1 Alternatively, it is recognized that SW2) is ON.

  Next, the magnitude of the voltage (inspection voltage) of the inspection signal input to DAT1 is recognized. As shown in FIG. 5, when the operation switch SW1 is ON and the operation switch SW2 is OFF, DAT1 has 5V × (resistance value of switch resistor SR1 / (resistance of switch resistor SR1) as shown in FIG. Value + resistance value of resistor R1)) = 2.86V is input.

  As shown in FIG. 7, when the operation switch SW2 is ON and the operation switch SW1 is OFF, DAT1 has 5V × (resistance of switch resistor SR2 / (switch resistor SR2) as shown in FIG. + (Resistance value of resistor R1)) = 1.93V.

  Further, as shown in FIG. 9, when both the operation switches SW1 and SW2 are ON, the DAT1 has 5V × (resistance value in case of the parallel connection of the switch resistors SR1 and SR2 / (Resistance value in case of parallel connection of switch resistors SR1 and SR2 + resistance value of resistor R1) = 1.49V is input.

  That is, when 2.86V is input to DAT1, it is recognized that the operation switch SW1 is ON and the operation switch SW2 is OFF. When 1.93V is input, the operation switch SW2 is ON and the operation switch SW1 is input. Is turned off, and when 1.49 V is input, it is recognized that both the operation switches SW1 and SW2 are turned on.

  Similarly, High is output to COM1 and Low is output to COM2, and 5V is input to DAT1 and an intermediate value is input to DAT2. If the intermediate value is 2.86V, the operation switch SW3 is turned on and the operation switch SW4 is turned off. It is recognized that the switch is OFF, and when the intermediate value is 1.93 V, the operation switch SW4 is turned on and the operation switch SW3 is turned off. When the intermediate value is 1.49 V, the operation switches SW3 and It is recognized that both SW4 are ON.

  When Low is output to COM1 and High is output to COM2, an intermediate value of 0 to 5 V is input to DAT1, 5 V is input to DAT2, and if the intermediate value is 2.86V, the operation switch SW5 is turned on. It is recognized that the operation switch SW6 is ON and the operation switch SW6 is OFF. If the intermediate value is 1.93V, it is recognized that the operation switch SW6 is ON and the operation switch SW5 is OFF, and the intermediate value is 1.49V. It is recognized that both the operation switches SW5 and SW6 are ON.

  In addition, Low is output to COM1 and High is output to COM2. An intermediate value of 5V is input to DAT1 and 0 to 5V is input to DAT2. If the intermediate value is 2.86V, the operation switch SW7 is turned on. When the switch SW8 is recognized to be OFF and the intermediate value is 1.93V, it is recognized that the operation switch SW8 is ON and the operation switch SW7 is OFF, and when the intermediate value is 1.49V, the operation is performed. It is recognized that both switches SW7 and SW8 are ON.

  The heating cooker 2 includes, as an individual operation unit provided in the operation unit 6, a stop command operation unit for inputting a command to stop heating by the heating unit 4 to the control unit. In the present embodiment, the power supply operation unit 7 and the control unit constitute a stop command operation unit. By pressing and operating the power supply operation unit 7, the stove burner can be extinguished. By the way, when the power supply operation unit 7 is pushed in a state where the stove burner is burning, all the ignited ones among the three stove burners are extinguished. An operation switch SW8 corresponds to the stop command operation unit (power supply operation unit 7).

  When the circuit for detecting the operation of the operation switch of the present invention is used in the cooking device 2 (gas stove), the switch resistor SR8 provided in series with the operation switch SW8 corresponding to the stop command operation unit (power supply operation unit 7). Is the lowest resistance value.

  More specifically, the location of the switch resistor SR8 provided in series with the operation switch SW8 is short-circuited by a conductor. In other words, the resistance value of the switch resistor SR8 provided in series with the operation switch SW8 is set to 0Ω.

  As described above, the resistance value of the switch resistor SR8 provided in series with the operation switch SW8 corresponding to the stop command operation unit (power supply operation unit 7) is set to the lowest resistance among the plurality of switch resistors SR1 to SR8. Since the value is provided, the impedance between the output line o1 to which the operation switch SW8 is connected and the input line i2 to which the operation switch SW8 is connected is reduced. Thereby, even when noise is applied to the operation detection circuit of the operation switch SW8, occurrence of erroneous detection is suppressed, and when the stop command operation unit (power supply operation unit 7) is operated, the heating unit properly controls the operation. A heating stop command can be input to the control unit, and a safe heating cooker 2 can be provided.

  In the embodiment shown in FIG. 4, two switch conductors and two operation switches (SW1 and SW2, SW3 and SW4, SW5 and SW6, SW7 and SW8) are provided at each of the operation switch installable locations G1 to G4. The resistance values of the switch resistors (SR1 and SR2, SR3 and SR4, SR5 and SR6, SR7 and SR8) provided on each switch conductor were two types (10 kΩ, 4.7 kΩ). On the other hand, three switch conductors and three operation switches may be provided in each of the operation switch installable locations, and the switch resistors provided on each switch conductor may have three types of resistance values. More generally, p is an integer of 4 or more, and p switch conductors and p operation switches are provided at places where operation switches can be installed, and the resistance value of a switch resistor provided on each switch conductor is p. There may be kinds.

  Further, in the embodiment shown in FIG. 4, the number m of the output lines is two, but the number m of the output lines may be three, four,. Although the number n of input lines is two, the number n of output lines may be four or more, such as three, four,. In this case, assuming that the number of switch conductors and operation switches provided in each operation switch installable location and the number of types of switch resistors are p, at most m × n × p operation switches can be installed. .

  Further, the voltage values of the voltage sources V1 and V2 are not limited to 5V but may be arbitrary values. FIG. 11 shows another example of an operation detection circuit for an operation switch. In this example, the voltage values of the voltage sources V1 and V2 are 0V. Diodes D11 to D18 for preventing backflow when the plurality of operation switches SW1 to SW8 are simultaneously pressed are connected in the opposite direction to the diodes D1 to D8.

  Then, Low (0 V) is output to COM1 as an inspection signal, and High (5 V) is output to COM2. At this time, if all the operation switches SW1 to SW8 are OFF, 0 V is input to DAT1 and DAT2. Further, even if any one of the operation switches SW5 to SW8 is turned on and the rest of the operation switches SW1 to SW8 are turned off, 0V is input to DAT1 and DAT2.

  If the operation switch (SW1 or SW2) of the operation switch installable portion G1 is turned on and the remaining operation switches SW3 to SW8 are turned off, an intermediate value of 0 to 5 V is input to DAT1 and 0 V is input to DAT2, and the operation is performed. It is recognized that the switch (SW1 or SW2) is ON. Then, as shown in FIG. 12, the voltage value input to DAT1 is 5V × (resistance value of resistor R1 / (resistance value of switch resistor SR1 + resistance value of resistor R1)) = 2.14V. In this case, it is recognized that the operation switch SW1 is ON and the operation switch SW2 is OFF.

  If the voltage value input to DAT1 is 5V × (resistance value of resistor R1 / (resistance value of switch resistor SR2 + resistance value of resistor R1)) = 3.07V, the operation switch SW2 Is turned on and the operation switch SW1 is turned off. When the voltage value input to DAT1 is 5V × (resistance value of resistor R1 / (resistance value when switch resistors SR1 and SR2 are connected in parallel + resistance value of resistor R1)) = 3.51V Is recognized that both the operation switches SW1 and SW2 are ON.

  Similarly, in the case of other operation switch installable locations G2 to G4, it is possible to recognize ON and OFF of the operation switches SW3 to SW8.

  Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Kitchen counter 11 Counter top 11a Front edge 12 Cooking work surface 2 Cooking device 3 Top plate 4 Heating part 5 Gotoku 6 Operation part 7 Power supply operation part COM1-COM2 Output terminal DAT1-DAT2 Input terminal D1-D8 Diode D11-D18 Diode G1 to G4 Operation switch installation location i1 to i2 Input line o1 to o2 Output line R1 to R2 Resistor SW1 to SW8 Operation switch SR1 to SR8 Switch resistor V1 to V2 Voltage source

Claims (2)

A control unit that includes a plurality of output terminals and a plurality of input terminals, outputs a test signal having a predetermined pulse width to the output terminal, and detects the test voltage input to the input terminal, and is connected to the output terminal, respectively. A plurality of output lines, a plurality of input lines respectively connected to the input terminal, a voltage source connected to the input line via a resistor, and a connection between the output line and the input line. And an operation switch that is turned ON only during operation while being disposed on the switch conductor and turned OFF when the operation is stopped. The main body is formed between each output line and each input line. Each of the switch lead wires and the operation switch can be set at an operation switch installable location, and one of the operation switch installable locations is connected to a corresponding one of the output line and the input line. Said switch leads and the operation switch are provided for each of the plurality of the switches conductor provided in the operation switch can be installed position of the one switch resistor resistance values are different from each other are provided on the operation switch in series An operation detection circuit for an operation switch. A heating cooker provided with the operation switch operation detection circuit according to claim 1, wherein the heating unit, a control unit that controls start and stop of heating by the heating unit, and a command to stop heating by the heating unit. A stop command operating unit for inputting the control unit to the control unit,
A heating cooker, wherein a resistance value of the switch resistor provided in series with the operation switch corresponding to the stop command operation unit is the lowest resistance value among all the switch resistors.

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