JP5084565B2 - Electronic device having changeover switch - Google Patents

Description

  The present invention relates to an electronic apparatus including a changeover switch that determines a changeover position of a changeover switch with a microcomputer.

  An electronic device in which a changeover switch is connected to a microcomputer can be changed over to various operating states by changing over the changeover switch. For example, in a portable electronic body warmer, the changeover switch can be used to turn on / off a power switch and change the strength of a heater. As shown in FIG. 1, this type of electronic device can detect the switching position of the changeover switch 81 by changing the voltage input to the microcomputer 82 via the pull-up resistor 87. In this electronic device, when the movable contact 83 of the changeover switch 81 is switched to the first to third fixed contacts 84A, 84B, and 84C, the voltage input to each input terminal 86 of the microcomputer 82 changes. However, the electronic device shown in FIG. 1 requires a plurality of input terminals 86 in the microcomputer 82 in order to detect the switching positions of the plurality of fixed contacts 84 of the changeover switch 81. This is because the microcomputer 82 determines the switching position of the selector switch 81 from the voltage signal input to each input terminal 86.

The disadvantage of the circuit configuration of FIG. 1 can be solved by a circuit configuration in which the voltage of the input terminal is changed at the switching position of the switch, as described in Patent Document 1. FIG. 2 shows an example of a circuit that can detect the changeover state of the changeover switch using the fact that the voltage changes at the changeover position of the switch. Since this electronic device detects the switching position of the plurality of fixed contacts 94 of the changeover switch 91 by changing the voltage value input to the microcomputer 92 via the pull-up resistor 97 and the voltage dividing resistor 99, The switching position of the selector switch 91 can be determined using one input terminal 96. In the electronic apparatus having the circuit configuration shown in FIG. 2, as the movable contact 93 of the changeover switch 91 is switched to the first to third fixed contacts 94A, 94B, 94C, the voltage of the input terminal 96 is 5V, 2.5V. It changes like 1V. Therefore, the microcomputer 92 can determine the switching position of the selector switch 91 from the voltage input to the input terminal 96.
JP 2002-310807 A

  However, since the electronic device having the circuit configuration of FIG. 2 determines the switching position of the changeover switch with the microcomputer in the operating state, the microcomputer cannot be put into the sleep state. Therefore, in the circuit configuration in which the changeover switch is used together with the power switch, there is a drawback that the microcomputer consumes power wastefully even when the changeover switch is switched to the power-off position.

  The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to provide an electronic device that can determine the switching position of a changeover switch while reducing unnecessary power consumption of a microcomputer.

In order to achieve the above-described object, an electronic apparatus including the changeover switch according to the present invention has the following configuration.
An electronic apparatus according to a first aspect of the present invention includes a changeover switch 1 having a plurality of contacts and a microcomputer 2 connected to the changeover switch 1, and the microcomputer 2 is switched by a voltage value input from the changeover switch 1. The switch position of switch 1 is determined. The microcomputer 2 has an activation terminal 6 that detects that the input signal has been switched from “High” to “Low” and is switched from the sleep state to the operation state. The changeover switch 1 is a slide switch 1A, and the slide switch 1A includes a movable contact 3 and a plurality of fixed contacts 4. The movable contact 3 is connected to the earth line 5. The plurality of fixed contacts 4 include a first fixed contact 4 </ b> A that is not connected to the start terminal 6 of the microcomputer 2 and a second fixed contact 4 </ b> B that is connected to the start terminal 6 of the microcomputer 2. The second fixed contact 4 </ b> B is connected to the power supply circuit 8 via the pull-up resistor 7, and inputs a “High” signal to the activation terminal 6 when the movable contact 3 is in a non-contact state. When the movable contact 3 of the slide switch 1A is switched from the first fixed contact 4A to the second fixed contact 4B and the signal input to the start terminal 6 of the microcomputer 2 is switched from "High" to "Low", the start The microcomputer 2 is switched from the sleep state to the operating state from the voltage signal at the terminal 6, and the microcomputer 2 in the operating state detects the switching position of the changeover switch 1 from the voltage signal input to the start terminal 6.

  The electronic apparatus according to claim 2 of the present invention includes a changeover switch 1 having a plurality of contacts and a microcomputer 2 connected to the changeover switch 1, and the microcomputer 2 is switched by a voltage value input from the changeover switch 1. The switch position of switch 1 is determined. The microcomputer 2 has an activation terminal 6 that detects that the input signal has been switched from “Low” to “High” and is switched from the sleep state to the operation state. The changeover switch 1 is a slide switch 1A, and the slide switch 1A includes a movable contact 3 and a plurality of fixed contacts 4. The movable contact 3 is connected to the earth line 5. The plurality of fixed contacts 4 include a first fixed contact 4 </ b> A that is connected to the start terminal 6 of the microcomputer 2 and a second fixed contact 4 </ b> B that is not connected to the start terminal 6 of the microcomputer 2. The first fixed contact 4 </ b> A is connected to the power supply circuit 8 through the pull-up resistor 7, and inputs a “High” signal to the activation terminal 6 when the movable contact 3 is in a non-contact state. When the movable contact 3 of the slide switch 1A is switched from the first fixed contact 4A to the second fixed contact 4B and the signal input to the start terminal 6 of the microcomputer 2 is switched from "Low" to "High" The microcomputer 2 is switched from the sleep state to the operating state from the voltage signal at the terminal 6, and the microcomputer 2 in the operating state detects the switching position of the changeover switch 1 from the voltage signal input to the start terminal 6.

  In the electronic device according to the third aspect of the present invention, the slide switch 1A of the changeover switch 1 has the first fixed contact 4A as the power switch OFF position.

  In the electronic device according to claim 4 of the present invention, the slide switch 1A of the changeover switch 1 has the third fixed contact 4C for switching the movable contact 3 from the first fixed contact 4A via the second fixed contact 4B. The third fixed contact 4C is connected to the voltage detection terminal of the microcomputer 2 through the voltage dividing resistor 9.

  The electronic devices according to the first and second aspects of the present invention are characterized in that the changeover position of the changeover switch can be determined while reducing unnecessary power consumption of the microcomputer. The microcomputer that is in the sleep state without changing the changeover switch is changed from the sleep state to the operating state when the changeover switch is changed and the voltage at the start terminal of the microcomputer is changed between “High” and “Low”. This is because the switching position of the selector switch can be determined. The microcomputer in the sleep state is provided with a start terminal that can be switched from the sleep state to the operation state by detecting that the microcomputer is switched between “High” and “Low”. Therefore, the voltage of the start terminal is set to “High” and “Low”. ”To cancel the sleep state and put it into an operating state. The microcomputer in the operating state can determine the switching position of the changeover switch from the voltage of the start terminal.

  Furthermore, in the electronic device according to claim 3 of the present invention, the first fixed contact of the slide switch, which is a changeover switch, is set to the OFF position of the power switch, so that the movable contact of the slide switch is switched to the first fixed contact. By putting the microcomputer in the sleep state, wasteful power consumption can be reduced. Further, since the changeover switch is used together with the power switch, the electronic device can be switched to a plurality of operating states, for example, the strength of the heater, while the power supply is turned on / off with one changeover switch.

  According to a fourth aspect of the present invention, the slide switch as the changeover switch has a third fixed contact that is switched from the first fixed contact via the second fixed contact. The fixed contact of is connected to the voltage detection terminal of the microcomputer through a voltage dividing resistor. The electronic device having this circuit configuration is switched from the first fixed contact to the second fixed contact, and the voltage signal divided by the pull-up resistor and the voltage dividing resistor is applied to the microcomputer in the operating state from the sleep state. Entered. The microcomputer in the operating state can determine from the voltage value of the input voltage that the movable contact has been switched to the third fixed contact. In addition, in this circuit configuration, as a change-over switch having four or more contacts, voltage dividing resistors having different electric resistances are connected to the respective fixed contacts, so that a larger number of switch positions can be discriminated.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies an electronic device provided with a changeover switch for embodying the technical idea of the present invention, and the present invention does not specify the electronic device as the following circuit configuration.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  3 and 4 includes a change-over switch 1 having a plurality of contacts and a microcomputer 2 to which the change-over switch 1 is connected. In this electronic device, the switching position of the changeover switch 1 is determined by the voltage value input from the changeover switch 1 by the microcomputer 2. For example, as an electronic device, a portable electronic warmer that incorporates a lithium ion secondary battery (not shown) and heats a heater can be used. In such an electronic device, a microcomputer operates by receiving power supply from a battery, and a heater (not shown) is energized and heated by a built-in on / off switching element (not shown) as instructed by the microcomputer. . Here, since such an electronic device needs to regularly monitor the voltage, current, remaining amount, etc. of the battery even when the changeover switch as the power switch is off, it is necessary to operate the microcomputer. Since it is not necessary to monitor constantly or frequently as when the change-over switch which is a power switch is on, the microcomputer can be monitored from time to time in the sleep state. Furthermore, by putting the microcomputer in the sleep state, the power consumption of the microcomputer can be reduced, and the power consumption of the battery can be reduced.

The changeover switch 1 is a slide switch 1A. The slide switch 1A includes a movable contact 3 and a plurality of fixed contacts 4. The movable contact 3 is sequentially slid on the fixed contact 4 to switch the fixed contact 4 to which the movable contact 3 contacts. The changeover switch 1 shown in FIGS. 3 and 4 includes first to third fixed contacts 4. The slide switch 1A is switched in the order of the first fixed contact 4A, the second fixed contact 4B, and the third fixed contact 4C. That is, the first fixed contact 4A is not directly switched to the third fixed contact 4C, but is always switched to the second fixed contact 4B and then switched to the third fixed contact 4C. When switching from the third fixed contact 4C to the first fixed contact 4A, the switching is performed in the order of the third fixed contact 4C, the second fixed contact 4B, and the first fixed contact 4A. As described above, the changeover switch 1 is the slide switch 1A in which the movable contact 3 reciprocates. There is a rotary slide switch as well, but this slide switch rotates in the order of the first fixed contact → the second fixed contact → the third fixed contact → the first fixed contact. be able to. Further, the fixed contact can be switched by rotating in the opposite direction.
In the electronic apparatus of the present embodiment, when the changeover switch 1 is switched to the first fixed contact 4A, the second fixed contact 4B, and the third fixed contact 4C, the microcomputer 2 operates, 1 state (for example, off state), 2nd state (for example, warming and warming state as warmer), 3rd state (for example, warming and warming state as warmer) ).

  The movable contact 3 of the slide switch 1A is connected to the ground line 5. 3 and 4 includes a first fixed contact 4A, a second fixed contact 4B, and a third fixed contact 4C. The slide switch 1A, which is the changeover switch 1 in FIG. 3, sets the first fixed contact 4A to the open state without connecting the start terminal 6 of the microcomputer 2, and connects the second fixed contact 4B to the power supply circuit 8 via the pull-up resistor 7. The “High” signal is input to the start terminal 6 in a state where the movable contact 3 is not touched. The first fixed contact 4 </ b> A that is not connected to the start terminal 6 of the microcomputer 2 can be connected to the earth line 5. Further, it can be connected to a terminal other than the start terminal 6 of the microcomputer 2. The second fixed contact 4B is connected to the power supply circuit 8 via the pull-up resistor 7 in the non-contact state of the movable contact 3, and becomes “High”. Is connected to the ground line 5 and becomes “Low”. The third fixed contact 4 </ b> C is connected to the voltage detection terminal 10 of the microcomputer 2 through the voltage dividing resistor 9. In the illustrated microcomputer 2, the start terminal 6 and the voltage detection terminal 10 are shared by one input terminal. However, the start terminal and the voltage detection terminal may be different input terminals. In the illustrated electronic apparatus, the pull-up resistor 7 and the voltage dividing resistor 9 have the same electrical resistance, so that the start terminal 6 (voltage detection terminal) of the microcomputer 2 is in a state where the movable contact 3 is connected to the third fixed contact 4C. 10) is input with a voltage half the power supply voltage. In the microcomputer 2 having a power supply voltage of 5V, a voltage of 2.5V is input in a state where the movable contact 3 is connected to the third fixed contact 4C. In a state where the movable contact 3 is connected to the second fixed contact 4B, the voltage of the start terminal 6 of the microcomputer 2 is 0V because the second fixed contact 4B is connected to the earth line 5 by the movable contact 3. “Low” is input.

  4 connects the first fixed contact 4A to the start terminal 6 of the microcomputer 2 and does not connect the second fixed contact 4B to the start terminal 6 of the microcomputer 2. The first fixed contact 4 </ b> A is connected to the power supply circuit 8 via the pull-up resistor 7. Therefore, the first fixed contact 4 </ b> A is “High” when the movable contact 3 is not in contact, and is “Low” when the movable contact 3 is in contact. The third fixed contact 4 </ b> C is connected to the voltage detection terminal 10 of the microcomputer 2 through the voltage dividing resistor 9.

  The microcomputer 2 includes an activation terminal 6 that detects that the input signal has been switched from “High” to “Low” or “Low” to “High” and is switched from the sleep state (off state) to the operation state. ing. This starting terminal 6 is connected to an A / D converter (not shown) built in the microcomputer 2 and detects an input voltage in an operating state. In the electronic apparatus of FIG. 3, the second fixed contact 4 </ b> B is connected to the activation terminal 6. In the electronic device of FIG. 4, the first fixed contact 4 </ b> A is connected to the activation terminal 6.

  3 and 4 uses the changeover switch 1 as a power switch, with the movable contact 3 being connected to the first fixed contact 4A as a power-off state. In the electronic device shown in FIG. 3, when the movable contact 3 of the changeover switch 1 is held by the first fixed contact 4A, “High” is held in the start terminal 6 of the microcomputer 2 and the microcomputer 2 is in the sleep state. It becomes a state and reduces power consumption. When the user switches the movable contact 3 of the changeover switch 1 from the first fixed contact 4A to the second fixed contact 4B in order to use the electronic device, the signal input to the start terminal 6 of the microcomputer 2 is “High”. To “Low”. This is because the second fixed contact 4 </ b> B is connected to the earth line 5 by the movable contact 3. The microcomputer 2 detects that the voltage of the start terminal 6 has been changed from “High” to “Low”, and is switched from the sleep state to the operation state. The microcomputer 2 in the operating state is in a state where the switching position of the changeover switch 1 can be determined by the voltage value input to the voltage detection terminal 10 which is the start terminal 6. Therefore, in this state, the movable contact 3 is switched from the second fixed contact 4B to the third fixed contact 4C, and the voltage of the starting terminal 6 is the voltage obtained by dividing the power supply voltage from “Low”, in FIG. Then, it is detected that the voltage of ½ of the power supply voltage is input, and it is determined that the changeover switch 1 has been switched to the third fixed contact 4C.

  In the electronic device of FIG. 4, when the movable contact 3 of the changeover switch 1 is held by the first fixed contact 4 </ b> A, that is, when “Low” is input to the start terminal 6 of the microcomputer 2, the microcomputer 2 sleeps. It becomes a state and reduces power consumption. When the user switches the movable contact 3 of the changeover switch 1 from the first fixed contact 4A to the second fixed contact 4B in order to use the electronic device, the signal input to the start terminal 6 of the microcomputer 2 is “Low”. To “High”. This is because the first fixed contact 4 </ b> A connected to the start terminal 6 of the microcomputer 2 is not connected to the earth line 5. The microcomputer 2 detects that the voltage of the start terminal 6 has been changed from “Low” to “High”, and is switched from the sleep state to the operation state. The microcomputer 2 in the operating state is in a state where the switching position of the changeover switch 1 can be determined by the voltage value input to the voltage detection terminal 10 which is the start terminal 6. Therefore, in this state, the movable contact 3 is switched from the second fixed contact 4B to the third fixed contact 4C, and the voltage of the starting terminal 6 is the voltage obtained by dividing the power supply voltage from “High”, in FIG. Then, it is detected that the voltage of ½ of the power supply voltage is input, and it is determined that the changeover switch 1 has been switched to the third fixed contact 4C.

  In the above electronic apparatus, the changeover switch is a three-contact changeover switch including the first to third fixed contacts, but the changeover switch may be a changeover switch having four or more contacts, although not shown. In this electronic device, the circuit configuration of the first fixed contact and the second fixed contact of the changeover switch is the same as that shown in FIG. 3 or FIG. 4, and the third and subsequent fixed contacts have different electric resistances. By connecting the resistor, it is possible to determine the switching position for the third and subsequent fixed contacts from the voltage value input to the voltage detection terminal. In this electronic device, when the changeover switch switches from the first fixed contact to the second fixed contact, the microcomputer changes from the sleep state to the operation state, and the microcomputer in the operation state starts from the voltage value input to the voltage detection terminal. The switching state to the third and subsequent fixed contacts is determined. That is, according to this circuit configuration, even if a larger number of switching positions are provided as a switching switch having four or more contacts, the switching position can be determined.

It is a circuit diagram which shows an example of an electronic device provided with the conventional changeover switch. It is a circuit diagram which shows another example of the electronic device provided with the conventional changeover switch. It is a circuit diagram of electronic equipment provided with a changeover switch concerning one example of the present invention. It is a circuit diagram of an electronic device provided with the changeover switch concerning other examples of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Changeover switch 1A ... Slide switch 2 ... Microcomputer 3 ... Movable contact 4 ... Fixed contact 4A ... 1st fixed contact
4B ... Second fixed contact
4C ... Third fixed contact 5 ... Earth line 6 ... Startup terminal 7 ... Pull-up resistor 8 ... Power supply circuit 9 ... Voltage resistor 10 ... Voltage detection terminal 81 ... Changeover switch 82 ... Microcomputer 83 ... Moving contact 84 ... Fixed contact 84A ... First fixed contact
84B ... Second fixed contact
84C ... third fixed contact 86 ... input terminal 87 ... pull-up resistor 91 ... changeover switch 92 ... microcomputer 93 ... movable contact 94 ... fixed contact 94A ... first fixed contact
94B ... Second fixed contact
94C ... third fixed contact 96 ... input terminal 97 ... pull-up resistor 99 ... voltage dividing resistor

Claims (4)

A changeover switch (1) having a plurality of contacts and a microcomputer (2) connected to the changeover switch (1), and the changeover switch with a voltage value input from the changeover switch (1) to the microcomputer (2) In an electronic device comprising a changeover switch configured to determine the changeover position of (1),
The microcomputer (2) has an activation terminal (6) for detecting that the input signal is switched from “High” to “Low” and switching from the sleep state to the operation state,
The change-over switch (1) is a slide switch (1A), and this slide switch (1A) has a movable contact (3) and a plurality of fixed contacts (4), and the movable contact (3) is an earth line (5 ), The plurality of fixed contacts (4) are connected to the first fixed contact (4A) not connected to the start terminal (6) of the microcomputer (2) and the start terminal (6) of the microcomputer (2). The second fixed contact (4B) is connected to the power supply circuit (8) via the pull-up resistor (7), and the movable contact (3B) is connected. ) Is in a non-contact state and a “High” signal is input.
The movable contact (3) of the slide switch (1A) is switched from the first fixed contact (4A) to the second fixed contact (4B), and a signal input to the start terminal (6) of the microcomputer (2) is received. When “High” is switched to “Low”, the microcomputer (2) is switched from the sleep state to the operating state from the voltage signal of the starting terminal (6), and the microcomputer (2) in the operating state is switched to the starting terminal (6). An electronic device comprising a change-over switch configured to detect a change-over position of the change-over switch (1) from a voltage signal input to. A changeover switch (1) having a plurality of contacts and a microcomputer (2) connected to the changeover switch (1), and the changeover switch with a voltage value input from the changeover switch (1) to the microcomputer (2) In an electronic device comprising a changeover switch (1) configured to determine the changeover position of (1),
The microcomputer (2) has an activation terminal (6) for detecting that the input signal has been switched from "Low" to "High" and switching from the sleep state to the operation state,
The change-over switch (1) is a slide switch (1A), and this slide switch (1A) has a movable contact (3) and a plurality of fixed contacts (4), and the movable contact (3) is an earth line (5 The plurality of fixed contacts (4) are connected to the first fixed contact (4A) connected to the start terminal (6) of the microcomputer (2) and the start terminal (6 of the microcomputer (2)). And a second fixed contact (4B) that is not connected to the power supply circuit (8) via a pull-up resistor (7) and a movable contact (3 ) Is in a non-contact state and a “High” signal is input.
The movable contact (3) of the slide switch (1A) is switched from the first fixed contact (4A) to the second fixed contact (4B), and a signal input to the start terminal (6) of the microcomputer (2) is received. When switching from “Low” to “High”, the microcomputer (2) is switched from the sleep state to the operating state from the voltage signal of the starting terminal (6), and the microcomputer (2) in the operating state is switched to the starting terminal (6). An electronic device comprising a change-over switch configured to detect a change-over position of the change-over switch (1) from a voltage signal input to.   The electronic device comprising the change-over switch according to claim 1, wherein the slide switch (1A) of the change-over switch (1) has the first fixed contact (4A) as an off position of the power switch.   The slide switch (1A) of the selector switch (1) has a third fixed contact (4C) whose movable contact (3) is switched from the first fixed contact (4A) via the second fixed contact (4B). And the third fixed contact (4C) is connected to the voltage detection terminal (10) of the microcomputer (2) via the voltage dividing resistor (9). Electronics.

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