JP2012112576A - Operation detection circuit for operation switch, and heating cooker using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation detection circuit for an operation switch, capable of detecting a conduction failure, and a heating cooker including the same.SOLUTION: The operation detection circuit mainly includes a control unit capable of outputting and detecting the inspection signal of a prescribed determined pulse width, a plurality of output lines (o1 to o3) and a plurality of input lines (i1 and i2), switch conductors connected between the output lines and the input lines, and operation switches (ST, SC, S1, and S2) arranged in the switch conductors to be turned ON only when operated, and turned OFF when stopped, and includes conduction means (A1 and A2) for always enabling conduction between one output line and one input line. The heating cooker provided includes the operation detection circuit.

Description

  The present invention relates to an operation detection circuit for an operation switch and a cooking device provided with the circuit.

  When a circuit that detects that a plurality of operation switches in the operation unit are operated is configured by a so-called static circuit that detects an operation on each operation switch via an individual input line connected to the operation switch (for example, a patent) Reference number 1), the number of signal lines is required as many as the number of operation switches. If a so-called dynamic circuit is used, the number of signal lines can be reduced more than the number of operation switches. The equipment that was found is known. As a device to which a dynamic circuit is applied, for example, as a power on / off means for turning on / off the power supply to the control unit, the switch is turned on only while the power switch is pressed (hereinafter referred to as “power on operation”). Thus, a cooking device using a tact switch that turns off when the pressing operation is stopped is known.

  In this heating cooker, a heating stop command is input to the control unit by pressing and operating the ignition / extinguishing switch while the heating unit is in use. In addition to the control unit provided in the main body, an operation unit provided with operation switches for performing operations such as an operation unit for ignition / extinguishing and ignition / extinguishing of a heating unit in a heating cooker, and adjustment of thermal power, When connecting the signal line from the control unit and the signal line from the operation unit with a connector, a connector that connects the signal line from the control unit and the signal line from the operation unit has high contact reliability. If it is used, but the contact between the signal lines to be connected by the connector is incomplete in the connector, that is, if the continuity is poor, turn on the ignition / extinguish switch while using the heating unit. Even if the pressing operation is performed, there arises a disadvantage that heating in the heating unit cannot be stopped.

  In particular, when a tact switch is used as an ignition / extinguishing switch, the ignition / extinguishing switch is turned on only during the pushing operation and the ignition / extinguishing switch is turned off when the pushing operation is stopped. Since the ignition / fire extinguishing switch is turned off, even if a continuity failure occurs in the connector, this continuity failure cannot be detected by the control unit.

JP 2010-144941 A

  The present invention has been invented in view of the above-mentioned conventional problems, and the object of the present invention is to form a so-called dynamic circuit, and to prevent this conduction failure when there is a possibility of conduction failure due to the use of a connector or the like. An operation detection circuit for an operation switch that can be detected is provided, and an operation detection circuit for the operation switch is provided, and the operation switch is operated as an ignition / extinguishment switch for inputting an ignition / extinguishment command to the control unit. When a tact switch that turns on the ignition / fire extinguishing switch and turns off the ignition operation when the operation is stopped is used only when the signal line from the control unit and the signal line from the operation unit are connected with a connector. An object of the present invention is to provide a safe cooking device that stops heating when a conduction failure in a connector is detected.

  In order to solve the above problems, an operation detection circuit for 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. And a control unit that detects the inspection signal input to the input terminal, a plurality of output lines connected to the output terminal, a plurality of input lines connected to the input terminal, and the output line, respectively. And a switch lead connected to the input line, and an operation switch that is turned on and turned off only when it is disposed and operated on the switch lead. An operation switch arrangement place where the switch conductor can be connected between the output line and any one of the input lines, and one or more operation switches among the operation switch arrangement places In the place where the operation switch can be placed, a conduction means for always conducting between the output line and the input line is provided at the place where the operation switch can be placed. The operation switch arranged at any position where the operation switch can be arranged from a combination of the input line to which the inspection signal is input and the output line to which the inspection signal is output at this time is output. It is characterized by detecting whether it has been operated.

  With such a configuration, when there is a continuity failure in the output line or the input line that forms the position where the operation switch can be provided with the continuity means, this continuity failure can be detected. In particular, when an output line and an input line are relay-connected using a connector, a continuity failure can be detected at a connector connection portion where a continuity failure is likely to occur, and measures according to the continuity failure can be taken.

  The invention according to claim 2 is the invention according to claim 1, wherein the specific operation switch is a conduction failure detection target switch, and the operation switch placement location where the conduction failure detection target switch is placed is formed. The output line and the input line are defined as a specific output line and a specific input line, respectively, and the conduction means is provided at the position where the operation switch can be arranged formed between the specific output line and the input line other than the specific input line. The first specific conduction means is provided, and the second specific conduction means is provided as the conduction means at the position where the operation switch can be arranged formed between the output line other than the specific output line and the specific input line. Features.

  By adopting such a configuration, it is possible to detect a continuity failure of the output line and the input line involved in the detection of the operation of the operation switch having a high priority regarding the detection of the operation, and among the places where the operation switch can be arranged. Compared to the configuration in which the conduction failure of all the output lines and all the input lines can be detected because the conduction means is only arranged at the place where the first specific conduction means and the second specific conduction means are arranged. Thus, more operation switches can be arranged in places where operation switches can be arranged.

  The invention according to claim 3 is the invention according to claim 1, wherein any one of the output lines is a first output line for which a conduction failure is to be detected, and any one of the input lines is detected for conduction failure. The first input line that is the target, and any one of the output lines other than the first output line is the second output line that is subject to continuity detection, and any one of the inputs other than the first input line The line is a second input line for which a continuity failure is to be detected, and the first continuity detection is used as the continuity means at the place where the operation switch can be arranged formed between the first output line and the first input line. A first conduction means including a diode is provided, and a second conduction failure detection diode is provided as the conduction means at the position where the operation switch can be arranged formed between the second output line and the second input line. Provided with a second conduction means. When the signal is constituted by a rising pulse, the first conduction failure detection diode and the second conduction failure detection diode have an anode connected to the output line side and a cathode connected to the input line side. A portion of the first conduction means on the cathode side of the first conduction failure detection diode and a portion of the second conduction means on the cathode side of the second conduction failure detection diode are connected by a conductor. In addition, when the operation signal is provided as an operation failure detection target switch and the inspection signal is constituted by a falling pulse, the first conduction failure detection diode and the second connection diode are connected. The conduction failure detecting diode has a cathode connected to the output line side and an anode connected to the input line side, and the first conduction means includes the first conduction means. An anode-side portion of the first conduction failure detection diode and an anode-side portion of the second conduction means detection diode are connected by a conductor, and an operation switch is provided on the conductor; This is a continuity failure detection target switch.

  By adopting such a configuration, poor conduction occurs in the first output line or its connection, or poor conduction occurs in the first input line or its connection, or in the second output line or its connection. Even when a continuity failure occurs or a continuity failure occurs in the second input line or its connecting portion, it is possible to detect the operation of the continuity failure detection target switch. Therefore, when taking a countermeasure when a continuity failure occurs, the urgency to take the countermeasure is reduced.

  Moreover, the heating cooker of this invention is a heating cooker provided with the operation detection circuit of the operation switch of Claim 2 or Claim 3, Comprising: The start and stop of the heating by a heating part and a heating part are controlled A control unit, an operation unit for inputting a heating start command and a heating stop command by the heating unit to the control unit, and a connector interposed between the operation unit and the control unit. A signal line relayed by the connector, the operation unit includes the operation switch, the output line and the input line are included in the signal line, and at least an input of the heating stop command, This is performed by operating the conduction failure detection target switch.

  By adopting such a configuration, it is possible to detect a continuity failure even when a continuity failure of the output line and the input line involved in the operation to stop heating occurs due to a connection failure by the connector. In addition, since a measure such as stopping heating by the heating unit can be taken when a conduction failure is detected, a safe cooking device can be obtained.

  In the present invention, it is possible to detect a continuity failure in the operation detection circuit of the operation switch constituted by a so-called dynamic circuit, and when the continuity failure is detected in the heating cooker, the heating is stopped. Measures can be taken and safety can be ensured.

It is a perspective view of the state which showed the kitchen counter with which the cooking-by-heating machine provided with the circuit for operation detection of the operation switch of this invention was integrated, and the operation part of the cooking-by-heating machine was pulled out. It is a perspective view of the state which showed the kitchen counter with which the cooking device provided with the circuit for operation detection of the operation switch of this invention was integrated, and the operation part of the cooking device was accommodated. It is a perspective view of the cooking-by-heating machine provided with the circuit for operation detection of the operation switch of this invention. It is a block diagram of the basic example of a dynamic circuit. It is a flowchart of the operation | movement in a dynamic circuit same as the above. It is a time chart of the example of the output of the pulse to an output terminal. It is a block diagram of the circuit for operation detection of 1st Example. It is a flowchart of the operation | movement in the same as the above. It is a block diagram of the circuit for operation detection of 2nd Example. It is a block diagram of the circuit for operation detection of 3rd Example. It is a block diagram of the circuit for operation detection of 4th Example. It is a block diagram of the circuit for operation detection of 5th Example.

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

  As shown in FIG. 1, the cooking device 2 provided with an operation detection circuit for the operation switch is a gas stove, and a main body portion in which three stove burners are juxtaposed in the horizontal direction as the heating portion 4. And the top plate 3 and the operation part 6 are comprised as a main part.

  The main body is suspended from the opening of the counter top 11 of the kitchen counter 1 and assembled to the counter top 11. In addition, although the heating cooker 2 of this embodiment is what is called a built-in type, of course, what is not a built-in type may be sufficient.

  The top plate 3 is mounted so as to cover the main body portion assembled to the counter top 11 and to make the peripheral edge abut against the upper surface of the counter top 11. On the other hand, Gotoku 5 is equipped.

  The main body is mounted at a position that is largely retracted to the rear side of the front edge of the countertop 11, and the top plate 3 is mounted in a state of covering the mounting portion of the main body, and is higher than the top plate 3 in the countertop 11. The front portion constitutes the cooking work surface 12.

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

  And in order to comprise the working surface 12 for cooking as mentioned above, the operation part 6 is mounted | worn with respect to the position which the main-body part and the top plate 3 retracted to the back side rather than the front edge of the countertop 11. It is mounted on the front edge side of the kitchen counter 1.

  Specifically, the operation unit 6 can be repositioned to a storage position (see FIG. 2) stored below the countertop 11 and a protruding position (see FIG. 1) protruding to the front side of the countertop 11. In the state of being supported and positioned at the protruding position, operations such as ignition and extinguishing of the three burners and adjustment of the thermal power can be performed (see FIG. 3).

  Although not shown in the drawing, the operation unit 6 positioned at the storage position is pushed slightly backward to perform a repositioning operation of the operation unit 6 to the protruding position, and the operation unit 6 positioned at the protruding position is moved. An operation unit holding mechanism is provided that automatically holds the storage position by pushing it into the storage position.

  Moreover, as shown in FIGS. 1-3, the power switch 7 is equipped in the side part of the operation part 6 in the front surface of the kitchen counter 1, and the operation part 6 is accommodated in a stowed position and a combustor is burned. In this state, when the cono burner is extinguished, the cono burner can be extinguished by pressing the power switch 7. Incidentally, when the power switch 7 is pushed and operated in a state where the burner is burning, all of the three burners that are lit are extinguished.

  The control unit is provided in the main body unit, and detects that the operation switch for performing operations such as ignition and extinguishing of the three burners and adjustment of the thermal power is operated by the operation detection circuit. In the configuration, a so-called dynamic circuit described later is used.

  The operation switch is provided in the operation unit 6. As this operation switch, a tact switch that is a momentary operation type switch that is turned on only during the operation and turned off when the operation is stopped is used. ing.

  The dynamic circuit in the operation detection circuit means that an operation switch is electrically connected between a plurality of output lines and a plurality of input lines connected to the control unit of the circuit, and one of the operation switches is operated. Detecting to which output line the inspection signal output by the control unit of the circuit is input from which input line, and detecting which operation switch is operated from the combination of the output line and the input line First, based on FIG. 4, an example of a basic dynamic circuit that does not correspond to the present invention is shown. In addition, the control part of a circuit consists of microcomputers, and the control part of a heating cooker may have the function like this embodiment, and may be provided separately, and is only called a control part hereafter. .

  The control unit includes a plurality of output terminals and a plurality of input terminals. In the example shown in FIG. 4, three output terminals (COM output 1 to COM output 3) and two input terminals (SW input 1, SW input 1, Although the SW input 2) is provided, the number of output terminals and input terminals is not limited to the above. Then, an inspection signal having a predetermined pulse width is output to the output terminal, and the inspection signal input to the input terminal is detected.

  Output lines (o1 to o3) are connected to the output terminals, and input lines (i1 to i3) are connected to the input terminals. The output lines and the input lines are connected to all the output terminals and input terminals of the control unit. Need not be connected to each other, but a plurality of output lines and input lines are connected.

  And between the arbitrary one output line and the arbitrary one input line, it is set as the operation switch arrangement | positioning location which can connect a switch conducting wire and the said operation switch, respectively. That is, there are as many operation switch disposition locations as the number of combinations of output lines and input lines. Although it is not necessary to connect the switch conductors and the operation switches to all the positions where the operation switches can be arranged, in the example shown in FIG. 4, the switch conductors and the operation switches (Su to Sz) are connected to all the positions where the operation switches can be arranged. Yes.

  The control unit outputs inspection signals to the plurality of output lines at different points in time, and selects any operation switch arrangement from the combination of the input line to which the inspection signal is input and the output line to which the inspection signal is output at this time. It is detected whether an operation switch arranged at a possible location is operated.

  As shown in the flow diagram of FIG. 5, first, when the high level signal (High) is output as the inspection signal only to the COM output 1, and the COM output 2 and the COM output 3 are kept at the low level (Low), the SW When a high level is input to the input 1, it is determined that the operation switch Su is ON. When a high level is input to the SW input 2, it is determined that the operation switch Sv is ON. Next, when the high level signal (High) is output as the inspection signal only to the COM output 2 and the COM output 1 and the COM output 3 are left at the low level (Low), the high level is input to the SW input 1. The operation switch Sx is determined to be ON, and if a high level is input to the SW input 2, it is determined that the operation switch Sw is ON. Next, when the high level signal (High) is output as the inspection signal only to the COM output 3 and the COM output 1 and the COM output 2 are left at the low level (Low), the high level is input to the SW input 1. The operation switch Sy is determined to be ON, and if a high level is input to the SW input 2, it is determined that the operation switch Sz is ON. Then, this cycle is repeated. FIG. 6 shows an example of two cycles of outputting a high-level signal pulse to each output terminal.

  The advantage of using such a dynamic circuit is that the number of signal lines connecting the control unit and the operation unit 6 can be reduced when configuring a circuit that detects that a plurality of operation switches in the operation unit 6 are operated. That is. That is, in the case of a so-called static circuit that detects an operation to each operation switch via an individual input line connected to each operation switch, the number of individual signal lines corresponding to each operation switch is Although the number of operation switches is required, when the dynamic circuit is used, the number of output lines is m (three in the example shown in FIG. 4), and the number of input lines is n (shown in FIG. 4). In the example, the number of operation switches of m × n (six in the example shown in FIG. 4) operation switches can be detected, and signal lines (that is, input lines and outputs) that connect the control unit and the operation unit 6 can be detected. The total number of lines is m + n (5 in the example shown in FIG. 4). On the other hand, in the static circuit, the number of signal lines connecting the control unit and the operation unit 6 necessary for detecting the operation of m × n operation switches (six in the example shown in FIG. 4) is the operation switch. M × n (six in the example shown in FIG. 4). In short, when detecting the operation of m × n operation switches, when m × n> m + n, the operation switch operation detection circuit is configured by a dynamic circuit compared to the case where the operation switch operation detection circuit is configured by a static circuit. In this case, the number of signal lines connecting the control unit and the operation unit 6 can be reduced.

  In the example shown in FIG. 4, the six diodes Du to Dz provided on the switch conductors having the operation switches Su to Sz are connected via the operation switches when a plurality of operation switches are operated simultaneously. This is a back-flow prevention diode at the time of simultaneous pressing for preventing the current from flowing in and erroneously detecting the operation of the operation switch.

  Signal lines such as the input lines and output lines described above are often cut off in the middle and connected by connectors provided at both ends thereof. In the example shown in FIG. 4, the connector 1 is interposed in the middle of the output line, and the connector 2 is interposed in the middle of the input line. In this case, when a connection failure occurs due to a contact failure at the connection points a to c in the connector 1 and the connection points d and e in the connector 2, the connection points a to c are connected to the output line or input line in which the connection failure occurs. Inconvenience that the operation of the existing operation switch cannot be detected.

Therefore, in the operation switch operation detection circuit of the present invention, between the output line and the input line that form the operation switch disposition location at one or more operation switch disposition locations among the operation switch disposition locations. Each of the following examples will be described.
[First embodiment]
When the continuity failure detection means is not provided as in the example shown in FIG. 4, there are six output lines m × input lines n = m × n signal lines (3 × 2 = 6 in the illustrated example). Although there are places where the operation switches can be arranged, in the embodiment shown in FIG. 7, as described below, no operation switches are assigned to two places where the six operation switches can be placed, Assigned for detecting continuity failure in connectors.

  As the operation switch, the operation unit 6 has a point fire extinguishing switch ST (a position where the operation switch can be disposed between the output line o1 and the input line i2) for inputting the ignition / extinguishing command of the heating unit 4 to the control unit, and a heating power. UP switch S1 (adjustable position between the output line o3 and the input line i1) for adjusting the increasing side, and DOWN switch S2 (output line o3 and the input line i2) for adjusting the thermal power decreasing side Between the operation switch 6 and the cancel switch SC for canceling the setting of the timer setting unit (not described in detail) in the operation unit 6 (where the operation switch can be disposed between the output line o2 and the input line i1). In this case, the point fire extinguishing switch ST is a continuity failure detection target switch.

  Then, the output line and the input line that form the position where the operation switch can be placed where the continuity failure detection target switch is arranged are respectively a specific output line (output line o1 in this embodiment) and a specific input line (input line in this embodiment). i2), a first specific conduction means A1 made of a conductive wire is provided at a place where an operation switch can be arranged formed between the specific output line and an input line other than the specific input line (in this embodiment, the input line i1). A second specific conduction means A2 made of a conductive wire is provided at a place where an operation switch can be arranged formed between an output line other than the output line (the output line o2 in this embodiment) and the specific input line. Further, the diode D1 in which current flows only from the output line o1 to the input line i1 in the first specific conduction means A1, and the diode D3 in which current flows only from the output line o2 to the input line i2 in the second specific conduction means A2. Is inserted. That is, the output line o1 and the input line i1 are short-circuited by the first specific conduction means A1 and are always maintained in a conduction state, and the output line o2 and the input line i2 are short-circuited by the second specific conduction means A2. Thus, it is configured to be maintained in a continuous state.

  Next, the operation will be described. As shown in FIG. 8, when the high level signal (High) is output as the inspection signal only to the COM output 1, and the COM output 2 and the COM output 3 are kept at the low level (Low), the SW input 1 is set to the high level. Is input, it is determined that there is no conduction failure in the path of the signal line from the COM output 1 to the SW input 1 (that is, the output line o1 and the input line i1), and a high level is not input to the SW input 1 It is determined that a continuity failure has occurred at the connection point a of the connector 1 or the connection point d of the connector 2, and when the high level is input to the SW input 2, the operation switch ST is determined to be ON. Next, when the high level signal (High) is output as the inspection signal only to the COM output 2 and the COM output 1 and the COM output 3 are left at the low level (Low), the high level is input to the SW input 1. When the operation switch SC is determined to be ON and a high level is input to the SW input 2, there is no conduction failure in the path of the signal line (ie, the output line o2 and the input line i2) from the COM output 2 to the SW input 2. If a high level is not input to the SW input 2, it is determined that a continuity failure has occurred at the connection point b of the connector 1 or the connection point e of the connector 2. Next, when the high level signal (High) is output as the inspection signal only to the COM output 3 and the COM output 1 and the COM output 2 are left at the low level (Low), the high level is input to the SW input 1. The operation switch S1 is determined to be ON, and if a high level is input to the SW input 2, it is determined that the operation switch S2 is ON.

  And when it is judged that there is no continuity defect, execution of control of the cooking-by-heating machine which has been performed until that time is continued.

  However, when it is determined that there is a continuity failure in the connector connection portions a and e for connecting the signal lines related to the detection of the operation of the point fire switch ST, heating by the stove burner (heating unit 4) is performed. When the operation is performed, the combustion in the combustor that is ignited and extinguished by the point fire extinguishing switch ST is stopped, and the error code is displayed in a blinking manner on the display unit for the combustor ignited and extinguished by the point fire extinguishing switch ST Fault notification is performed.

By doing so, in the connector 1 or the connector 2, when there is a continuity failure at a location that interferes with the detection of the operation of the point fire switch ST, particularly at the connection point a of the connector 1 or the connection point e of the connector 2. However, it is possible to maintain a safe state in which there is no inconvenience that the combustor cannot be extinguished even though the combustor is extinguished during combustion.
[Second Embodiment]
In the first embodiment, the connector 1 or the connector 2 is configured to detect the occurrence of a continuity failure that interferes with the detection of the operation of the point fire switch ST. It is also possible to configure so as to detect a conduction failure with respect to the signal lines (output line and input line). In this case, when the number of output lines is m and the number of input lines is n, the number of places that can be actually assigned to the operation switches without providing the conduction means among the places where the operation switches can be arranged is as follows.
(I) When m> n (see FIG. 9), in order to detect a continuity failure for all of the m output lines (three in the example shown in FIG. 9), the continuity connected to each output line. Since means are required, at least m conduction means are required. In order to detect conduction failure for all n (two in the example shown in FIG. 9) input lines, conduction means connected to each input line is required. Therefore, at least n conduction means are required. Necessary. Here, the conduction means connects one end of one conduction means to one output line and connects the other end to one input line, thereby detecting conduction failure of the one output line. Both the detection of the conduction failure of the one input line can be performed. For this reason, n conduction means (A3, A4 in the example shown in FIG. 9) connected to the input lines (i1, i2 in the example shown in FIG. 9) are connected to n output lines (FIG. 9). In the example shown in FIG. 9, the other end of the conduction means (A5 in the example shown in FIG. 9) is connected to the remaining mn output lines (o3 in the example shown in FIG. 9). It is only necessary to connect to such an input line (i2 in the example shown in FIG. 9), and m conduction means are eventually required. Therefore, the number of locations that can be assigned to the operation switches without providing the conduction means among the locations m × n where the operation switches can be arranged is m × n−m.
(Ii) In the case of m <n, although not shown, similarly, at least m conduction means are required for m output lines, and n conduction means are required for n input lines. Connect the other ends of the m conduction means connected to the m different input lines, and connect the other end of the conduction means connected to the remaining mn input lines to any output line. After all, n conduction means are required. Therefore, the number of locations where the operation switch can be arranged m × n where the conduction means is not provided and can be actually assigned to the operation switch is m × n−n.
(Iii) When m = n, although not shown, similarly, at least m conduction means are required for m output lines, and n conduction means are required for n input lines. The other ends of the m number of conduction means connected to each other may be connected to different n (= m) input lines, and eventually m (= n) conduction means are required. Therefore, the number of locations that can be assigned to the operation switches without providing the conduction means among the locations m × n where the operation switches can be arranged is m × n−m.

In the second embodiment, when a conduction failure occurs at the connection point a or the connection point d, a high level is not input to the SW input 1 when a high level signal is output to the COM output 1, and the connection point b Alternatively, when a conduction failure occurs at the connection point e, a high level signal is not input to the SW input 2 when a high level signal is output to the COM output 2, and a conduction failure occurs at the connection point c or the connection point e. When a high level signal is output to the COM output 3, a high level is not input to the SW input 2, so that a conduction failure occurs at any one of the connection points a to e. Even in such a case, since it is possible to detect that a continuity failure has occurred in the connector that connects the control unit and the operation unit 6, the connector that interferes with the detection of the operation of all the operation switches in the operation unit 6. It is possible to detect the occurrence of definitive conduction failure.
[Third embodiment]
When detecting the operation of m × n operation switches, the control unit and the operation unit are configured when the switch operation detection circuit is configured by a dynamic circuit, compared to the case where the switch operation detection circuit is configured by a conventional static circuit. 6 can be configured to reduce the number of signal lines when m × n> m + n. Therefore, when the switch operation detection circuit is configured by a dynamic circuit, n and m are 2 or more. (Except when n = m = 2). Thus, paying attention to the case where there are two or more output lines and input lines, the configuration is as shown in FIG.

  In the first embodiment and the second embodiment, the conduction means is provided at a predetermined position among the places where the operation switch can be arranged, and the conduction state is always maintained.

  On the other hand, in the third embodiment, any one output line (the output line o1 in FIG. 10) is set as the first output line to be a conduction failure detection target, and any one input line (in FIG. 10). The input line i1) is assumed to be a first input line whose continuity failure detection target. Any one of the output lines other than the first output line (the output line o2 in FIG. 10) is set as the second output line for which the conduction failure is to be detected, and any one of the input lines other than the first input line (see FIG. 10). 10 input lines i2) are assumed to be second input lines to be subjected to conduction failure detection. A first conduction means A6 including a first conduction failure detection diode D10 is provided at a place where the operation switch can be arranged formed between the first output line and the first input line, and the second output line The second conduction means A7 provided with a second conduction failure detection diode D12 as the conduction means is provided at the position where the operation switch can be arranged formed between the second input line. By providing the first conduction means A6, the first output line and the first input line are always maintained in the conduction state, and by providing the second conduction means A7, the second output line and the second input line are always in the conduction state. It is maintained in a conductive state.

  Further, a terminal (a cathode in this embodiment) opposite to a connection terminal (anode in this embodiment) to the first output line in the first conduction failure detection diode D10, and a second conduction failure detection diode D12. A conductive wire having a point-extinguishing switch ST is disposed between a connection terminal (anode in this embodiment) to the second output line and a terminal (cathode in this embodiment) on the opposite side.

  In the first conduction means A6 and the second conduction means A7, the reason why the conduction failure detection diodes D10 and D12 are provided in the middle and are not simply short-circuited is that when the point fire switch ST is operated, the output line o1 and the output This is to prevent current from flowing between the lines o2.

  In addition, diodes D11 and D13 are provided on the input line side of the conductive line including the conduction failure detection diodes D10 and D12, where the conduction failure detection diodes D10 and D12 are connected. The diodes D11 and D13 are reverse current prevention diodes at the time of simultaneous pressing for preventing a current from flowing through the operation switches and erroneously detecting the operation of the operation switches when a plurality of operation switches are operated simultaneously. .

The operation in the third embodiment will be described.
(A) When there is a continuity failure at the connection point a in the connector 1, a high level is not input to the SW input 1 when the COM output 1 is output at a high level, and therefore a continuity failure can be detected. However, the operation of the point fire switch ST cannot be detected by the input of the SW input 2 when the COM output 1 is at the high level output, but the point fire switch ST is not detected by the input of the SW input 1 when the COM output 2 is the high level output. Since it is possible to detect this operation, the combustion in the stove burner (heating unit 4) is not immediately stopped just because a poor conduction is detected.

By the way, the pulse width of the inspection signal sequentially sent to the plurality of output lines is set to, for example, several milliseconds (5 mS in the embodiment), so that combustion in the stove burner (heating unit 4) is detected when a conduction failure is detected. There is no substantial influence on the operational feeling due to the operation detection delay of the point fire extinguishing switch ST due to not stopping immediately.
(B) Further, when there is a continuity failure at the connection point b in the connector 1, a high level is not input to the SW input 2 when the COM output 2 is output at a high level, so that the continuity failure can be detected. However, the operation of the point fire switch ST cannot be detected by the input of the SW input 1 when the COM output 2 is at the high level output, but the point fire switch ST is not detected by the input of the SW input 2 when the COM output 1 is the high level output. Since it is possible to detect this operation, the combustion in the stove burner (heating unit 4) is not immediately stopped just because a poor conduction is detected.
(C) Similarly, when there is a continuity failure at one of the connection points d or e in the connector 2, the continuity failure can be detected, but the operation of the point fire switch ST can be detected. Therefore, just because the conduction failure is detected, the combustion in the stove burner (heating unit 4) is not immediately stopped.

  That is, in this third embodiment, a continuity failure occurs at the connection point a in the connector 1 connecting the first output line, or a continuity failure occurs at the connection point d in the connector 2 connecting the first input line. Or, a continuity failure occurs at the connection point b in the connector 1 connecting the second output line, or a continuity failure occurs at the connection point e in the connector 2 connecting the second input line. Even in this case, it is possible to detect the operation of the point fire extinguishing switch ST, so that the combustion in the stove burner (heating unit 4) is not immediately stopped just because the continuity failure is detected. However, since the combustion in the stove burner (heating unit 4) can be stopped by operating the point fire switch ST, there is no safety problem.

  However, a continuity failure occurs at the connection point a in the connector 1 connecting the first output line, or a continuity failure occurs at the connection point d in the connector 2 connecting the first input line, and the second output line. When a continuity failure occurs at the connection point b in the connector 1 that connects the two, or when a continuity failure occurs at the connection point e in the connector 2 that connects the second input line, the operation of the point fire switch ST can be detected. When the high level of the COM output 1 is output, the high level is not input to the SW input 1, and when the high level of the COM output 2 is not input, the high level is not input to the SW input 2. Is detected, and when heating by the stove burner (heating unit 4) is being executed, the point fire extinguishing switch ST Failure to stop combustion in the combustor (heating unit 4) to be ignited and extinguished, and to blink an error code on the display unit for the combustor (heating unit 4) to be ignited and extinguished by the point fire extinguishing switch ST Notification.

  As described above, in the third embodiment, even when there is a continuity failure at one of the connection points of the connector for connecting the signal line related to the detection of the operation of the point fire switch ST, The operation of ST can be detected.

However, as apparent from comparison between FIG. 7 and FIG. 10, in the first embodiment, in order to detect the continuity failure of the signal line in the connector related to the operation detection of the point fire extinguishing switch ST and the operation detection of the point extinguishing switch ST, In this third embodiment, in order to detect the continuity of the signal line in the connector relating to the operation detection of the point fire extinguishing switch ST and the operation detection of the point extinguishing switch ST, it is possible to configure by assigning three switches. Since it is necessary to allocate and configure four switches, the number of switches that can be arranged is reduced by one. For this reason, in the third embodiment, the cancel switch SC provided in the first embodiment is not provided. 10 indicates that the cancel switch SC and the broken line of the conductor portion are not provided.
[Fourth embodiment]
This embodiment shown in FIG. 11 is a modification of the third embodiment. In the third embodiment, when the operation unit 6 includes only one point fire extinguishing switch ST and does not include the operation switch of the third embodiment, An output line connected to the COM output 3 becomes unnecessary. Therefore, in the case where only one point fire extinguishing switch ST is provided, it is rational that the configuration as in the present embodiment requires fewer output lines and output terminals than in the third embodiment.
[Fifth embodiment]
This embodiment is a modification of the fourth embodiment. In the fourth embodiment, the backflow prevention diodes D11 and D13 at the time of simultaneous pressing are not provided, and this portion is simply short-circuited, and is shown in FIG.

  The conduction failure detection diodes D10 and D12 in the fourth embodiment are arranged in this embodiment in order to prevent a current from flowing between the output line o1 and the output line o2. , D13 is a reverse current prevention diode at the time of simultaneous pressing for preventing a current from flowing through the operation switch and erroneously detecting the operation of the operation switch when a plurality of operation switches are operated at the same time. is there. Therefore, in this embodiment in which only one point fire extinguishing switch ST is provided in the operation unit 6, a plurality of operation switches are not operated at the same time, so that the backflow prevention diodes D11 and D13 when simultaneously pressed are not necessary. The example is more reasonable than the fourth embodiment.

  In the first to fifth embodiments described above, the connector 1 is provided for connecting the output line, the connector 2 is provided for connecting the input line, and separate connectors are used for the output line and the input line. However, one connector may be used for the entire output line and input line, and three or more connectors may be provided, and there is no particular limitation.

  In the first to fifth embodiments described above, when a high level signal is output to the output line, a high level is input to the input line, thereby detecting the presence or absence of switch operation or conduction failure. However, it may be configured such that when a low level signal is output to the output line, a low level is input to the input line, thereby detecting the switch operation or the presence or absence of conduction failure. In this case, the anode and cathode of the backflow prevention diode and the conduction failure detection diode at the time of simultaneous pressing are mounted in the reverse directions of the first to fifth embodiments.

  Further, although the first to fifth embodiments described above are shown as examples of the switch circuit capable of detecting the continuity failure, the switch circuit capable of detecting the continuity failure is not limited thereto.

  Moreover, in this embodiment, although the switch circuit which can detect a continuity failure is applied to a gas stove, it is applied to equipment other than a heating cooker (for example, a so-called IH cooker or a microwave oven) other than a gas stove. It may be applied.

DESCRIPTION OF SYMBOLS 1 Kitchen counter 11 Counter top 11a Front edge 12 Cooking work surface 2 Heating cooker 3 Top plate 4 Heating part 5 Gotoku 6 Operation part 7 Power switch A1-7 Conducting means COM output 1-3 Output terminal SW input 1,2 Input Terminal o1-3 Output line i1, 2 Input line

Claims (4)

  A control unit comprising a plurality of output terminals and a plurality of input terminals, outputting an inspection signal having a predetermined pulse width to the output terminal and detecting the inspection signal input to the input terminal, and connected to the output terminal, respectively A plurality of output lines, a plurality of input lines connected to the input terminals, a switch conductor connected between the output line and the input line, and the switch conductor arranged and operated. An operation switch that is composed of an operation switch that is turned on only when the operation is stopped and that is turned off when the operation is stopped, and the switch conductor can be connected between any one of the output lines and any one of the input lines. Between the output line and the input line that form the position where the operation switch can be disposed at one or more operation switch positions where the operation switch can be disposed Conducting means for always conducting is provided, and the control unit outputs the inspection signal to each of the plurality of output lines at different times, the input line to which the inspection signal is input, and the inspection signal is output at this time. An operation switch operation detection circuit that detects which of the operation switch arrangement positions is operated from the combination of the output lines that has been operated.   The specific operation switch is a continuity failure detection target switch, and the output line and the input line that form the operation switch placement location where the continuity failure detection target switch is placed are a specific output line and a specific input line, respectively. The first specific conduction means is provided as the conduction means at the place where the operation switch can be arranged formed between the specific output line and the input line other than the specific input line, and the output lines other than the specific output line 2. The operation switch operation detection circuit according to claim 1, wherein a second specific conduction means is provided as the conduction means at a place where the operation switch can be disposed formed between the first input line and the specific input line.   Arbitrary one of the output lines is a first output line that is a continuity failure detection target, and any one of the input lines is a first input line that is a continuity failure detection target, and any other than the first output line The first output line is a second output line that is a continuity failure detection target, and any one of the input lines other than the first input line is a second input line that is a continuity failure detection target. A first conduction means including a first conduction failure detection diode as the conduction means is provided at the position where the operation switch can be arranged formed between a line and the first input line, and the second output line A second conduction means having a second conduction failure detection diode is provided as the conduction means at the place where the operation switch can be arranged formed between the second input line and the inspection signal is constituted by a rising pulse. If The continuity failure detection diode and the second continuity failure detection diode have an anode connected to the output line side and a cathode connected to the input line side, and the first conduction means has the first conduction state. The cathode side portion of the failure detection diode and the cathode side portion of the second conduction failure detection diode of the second conduction means are connected by a conducting wire, and an operation switch is provided on the conducting wire to conduct it. When the defect detection target switch is used and the inspection signal is constituted by a falling pulse, the first conduction failure detection diode and the second conduction failure detection diode have cathodes connected to the output line side. And the anode is connected to the input line side, and the anode side portion of the first conduction failure detection diode of the first conduction means and the first The conductive means is connected to the anode side portion of the second continuity failure detection diode by a conducting wire, and an operation switch is provided on the conducting wire to serve as a continuity failure detection target switch. The operation detection circuit of the operation switch according to 1.   It is a heating cooker provided with the operation detection circuit of the operation switch of Claim 2 or Claim 3, Comprising: The control part which controls the start and stop of the heating by a heating part, The heating by the said heating part An operation unit for inputting a start command and a heating stop command to the control unit, and a signal line connected between the operation unit and the control unit and relayed by the connector with a connector in the middle The operation unit includes the operation switch, the output line and the input line are included in the signal line, and at least the heating stop command is input by operating the conduction failure detection target switch. A cooking device characterized by that.

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