JP5754589B2 - An electronic device that notifies of a power connection abnormality - Google Patents

Description

The present invention relates to an electronic device that receives power supply via a DC plug and notifies a power supply connection abnormality .

  For example, a technique described in Patent Document 1 is known as an electronic device that receives power supply by connecting a power receiving terminal to a power feeding terminal of an external power supply device. In this prior art, by sharing a single power receiving terminal (power terminal), various external power supply devices such as an AC adapter, an external battery, and a car battery can be supported.

Japanese Patent Laid-Open No. 5-184065

  As described above, when the power receiving terminal of the device main body side is connected to the power supply terminal of the external power supply device to receive power supply, generally, any of the battery and the external power supply device with respect to the load in the device main body Also, power can be supplied. When the operator uses the power supply terminal of the external power supply device and the power receiving terminal on the device main body side without being connected, the positive electrode side of the battery and the load circuit are brought into conduction, and power is supplied from the battery to the load circuit. The When the operator uses the power supply terminal and the power receiving terminal of the external power supply device connected to each other, the positive electrode side of the battery and the load circuit become non-conductive and power is supplied from the external power supply device to the load circuit.

  Here, although the positive electrode side of the battery and the load circuit are non-conductive as described above, the primary of the external power supply device for some reason, such as an operator's forgetfulness or an external force load on the external power supply device. There is a possibility that the connection to the power supply side is not performed (or the connection is disconnected), and the power supply from the external power supply device to the load circuit is not performed. Alternatively, an operator may mistakenly connect a power supply terminal having a reverse polarity (reverse polarity) to a power reception terminal on the device body side to which a power supply terminal having a predetermined polarity (forward polarity) should be connected. There is also sex. In such an abnormal connection state, power is not supplied from the battery to the load circuit even though the battery is not supplied to the load circuit.

  The above-described prior art corresponds to connection to various external power supply devices, but no special consideration has been given to the above-described abnormal connection state.

An object of the present invention is to provide an electronic device for notifying a connection abnormality of a power source that can make an operator reliably recognize a connection abnormality state by detecting and notifying a connection abnormality .

In order to achieve the above object, the present invention provides a DC jack on the apparatus main body side connected to a DC plug of a predetermined polarity provided in an AC adapter which is an external power supply device capable of supplying power, and the DC jack. A load circuit to which power is supplied via the battery, a battery storage unit for storing a battery connected to supply power to the load circuit, and the DC plug of the AC adapter when not connected to the DC jack. When the DC plug of the AC adapter is connected to the DC jack, the positive side of the battery and the load circuit are made non-conductive. A switching mechanism that switches to two states, the switching mechanism switches to the second state, and the power required for the load circuit is negative from the AC adapter. Not supplied to the circuit, to detect the abnormal connection state, a connection failure detecting means, when the connection abnormality detecting means detects the abnormal connection state, the control circuit having a connection abnormality notification unit for performing a corresponding notification, the And when the switching mechanism is switched to the second state and the power necessary for the load circuit is not supplied from the AC adapter to the load circuit, the power supply from the battery to the control circuit is ensured. Power connection means, and the connection abnormality detection means operates based on the power secured by the power assistance means, and according to the change behavior of the voltage value of the ground side terminal of the DC jack While detecting the abnormal connection state, the voltage value of the ground side terminal of the DC jack or the divided voltage value thereof is changed to the first state by the switching mechanism being switched to the first state. The power necessary for the load circuit is supplied to the load circuit by the first voltage range corresponding to the adapter non-connected state or when the switching mechanism is switched to the second state. The second voltage range corresponding to the normal connection state of the adapter, or the switching mechanism switches to the second state, and the battery supplies the control circuit with the power necessary for the control circuit via the power auxiliary means. It is a voltage determination means for determining which one of the third voltage ranges corresponding to the adapter non-power supply state is supplied to the constant voltage circuit provided in the control circuit .

The electronic device for notifying a power connection abnormality according to the present invention is configured to be able to supply power to the load circuit by either a battery or an AC adapter that is an external power supply device. In other words, when the operator uses the AC adapter without connecting the DC plug of the AC adapter and the DC jack on the device body side, the switching mechanism conducts the positive side of the battery and the load circuit (first state), Power is supplied from the battery to the load circuit. If the operator used to connect the DC plug and DC jack of the AC adapter, the switching mechanism is non-conductive and the load circuit and the positive electrode side of the battery by (second state) that, the load circuit from the AC adapter Power is supplied to

Here, the switching mechanism as described above even though a second state, an external force load, etc. to the operator of forgetting or AC adapter, the primary power source of the primary power supply plug of the AC adapter for some reason There is a possibility that the power supply from the AC adapter to the load circuit is not performed because the connection to the side is not performed (or disconnected). Or, an operator may mistakenly connect a DC plug with a reverse polarity (reverse polarity) to a DC jack on the device body side to which a DC plug with a predetermined polarity (forward polarity) should be connected. There is also sex. In such an abnormal connection state, the switching mechanism switches to the second state, and power is not supplied from the AC adapter to the load circuit even though power is not supplied from the battery to the load circuit.

  Therefore, in the present invention, connection abnormality detection means is provided to detect the above-described connection abnormality, and when the connection abnormality is detected, the connection abnormality notification means performs corresponding notification. As a result, the operator can be informed that the connection is abnormal as described above, and can surely recognize the cause of the operational inconvenience.

  According to the present invention, an abnormal connection state can be surely recognized by an operator by detecting and notifying a connection abnormality.

It is a perspective view showing the whole tape printer in one embodiment of the present invention. It is a perspective view showing the back side of a tape printer. It is a perspective view showing the tape printer at the time of removing a back cover from the back side. It is a circuit diagram showing a state when the AC adapter is not connected. It is a circuit diagram showing a state when an AC adapter is connected. It is explanatory drawing showing the example of a display of AC adapter from which polarity differs. It is a circuit diagram showing a state when the DC plug of the AC adapter is not connected. It is a circuit diagram showing a state when the DC plug of an appropriate AC adapter is connected and power is supplied to the primary side. It is a circuit diagram showing a state when a DC plug of an inappropriate AC adapter having a reverse polarity is connected and power is supplied to the primary side. It is a circuit diagram showing a state when a DC plug of an appropriate or inappropriate AC adapter is connected and power is not supplied to the primary side (the AC plug is disconnected from the outlet). It is a flowchart showing the control procedure performed by CPU51. It is a perspective view showing the power cord unit which is a modification of an external power supply device.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an embodiment when the present invention is applied to a tape printer as an electronic apparatus.

<Schematic configuration of printing device>
A tape printer 100 according to the present embodiment (see FIGS. 4 and 5 described later) has a main body 1. First, a schematic configuration of the apparatus main body 1 will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the apparatus main body 1 (equipment main body) includes a resin casing 2 and a rear portion of the casing 2 (a surface facing the user when the apparatus main body 1 is used). And a resin-made back cover 3 that is detachably attached so as to cover the entire surface on the opposite side. The housing 2 includes an upper housing 4 and a lower housing 5.

  The upper housing 4 is provided with a key arrangement portion 7 on which various keys 6 such as a character key for inputting characters and the like and a print key for executing printing are arranged on the surface of the central portion. A horizontally long window portion 8 is formed in the center portion in the left-right direction, and a liquid crystal display 9 (connection abnormality notification means) for displaying characters and the like input from the keys 6 is disposed in the window portion 8. Yes. Further, a cutter lever 10 is provided on the left side surface portion of the liquid crystal display 9 of the housing 2, and when the cutter lever 10 is pushed inward with a thumb or the like, the cutter lever 10 is discharged from a tape discharge port 11 formed at the upper end portion. The printed tape 12 (see FIG. 3) can be cut with a cutting blade (not shown). Further, the print-receiving tape 12 is laminated with an image receiving layer on which characters are printed, an adhesive layer for attaching to an object to be attached, and a release paper for protecting the adhesive surface of the adhesive layer.

  In addition, the left and right width dimensions of the lower housing 5 provided with the key arrangement portion 7 are formed to be slightly narrower than the left and right width dimensions provided with the window portion 8, and are formed on both side portions of the lower housing 5. Grip members 13A and 13B are attached. Three protrusions 14 are formed on the surfaces of the grip members 13A and 13B in parallel to the apparatus.

  Further, the apparatus main body 1 is formed separately from the first protective member 15A and the first protective member 15A covering the end portion where the liquid crystal display 9 is provided, and the end portion where the liquid crystal display 9 is provided. A second protective member 16A that covers the end corresponding to the opposite side is attached. Each of the protection members 15A and 16A is divided into two parts between the upper housing 4 and the lower housing 5 and the back cover 3, and the first protection member 15A is provided on the upper housing 4 and the lower housing 5. And a second protective member 16A, and a first protective member 15B and a second protective member 16B are attached to the back cover 3, respectively.

<Internal structure>
Next, the internal structure of the apparatus main body 1 will be described with reference to FIG. As shown in FIG. 3, the lower housing 5 is provided with a substantially rectangular cassette housing portion 21 that is substantially the same as the outer shape of the tape cassette 20. Further, a thin plate-like thermal head mounting portion 23 to which a thermal head 22 (printing means) is mounted is disposed at a right angle along the longitudinal direction of the apparatus near the edge of the cassette housing portion 21 on the cutter lever 10 side. It is erected. In addition, a platen holder (not shown) is rotatably provided in the drive unit 24 provided on the side portion of the cassette storage unit 21 facing the thermal head 22.

  When the back cover 3 is attached to the lower surface of the lower housing 5, a protrusion (not shown) provided on the inner surface of the back cover 3 enters the engagement hole 25 of the drive unit 24. At that time, the platen holder rotates toward the thermal head 22 and a part of the print-receiving tape 12 of the tape cassette 20 is pressed against the thermal head 22. In this state, the print-receiving tape 12 printed via the thermal head 22 is conveyed by a tape conveying mechanism (conveying means, not shown) including a drive motor and discharged from the tape discharge port 11.

  On the opposite side of the lower housing 5 where the cassette storage portion 21 is provided, a battery storage portion 27 for storing six batteries 38 side by side is formed. The six batteries 38 stored in the battery storage unit 27 are connected in series. In addition, a control board portion 37 (see FIG. 4 described later) is disposed inside the upper housing 4.

  Further, a DC jack 33 (power receiving terminal) is provided at an end of the housing 2 on the grip side. The DC jack 33 is an insertion port for the first terminal 34A of the AC adapter 34 (external power supply device). The apparatus main body 1 can use the AC adapter 34 as a drive power source by connecting the AC adapter 34 via the DC jack 33. That is, the apparatus main body 1 of this embodiment is a multi-power supply system that can selectively use one of two types, ie, a battery and an AC adapter 34 as a power source. The apparatus main body 1 corresponds to an electronic device described in each claim.

  Further, when the back cover 3 is attached to the lower surface of the lower housing 5, the first insertion portion 28 formed at the end portion on the side where the second protection member 16 </ b> B is provided is connected to the lower housing 5. After being inserted into the insertion groove 29, the second insertion part 30 provided on the opposite side of the first insertion part 28 is fitted into a fixing part (not shown) provided in the lower housing 5. Thereby, the back cover 3 is attached. Further, in a state where the back cover 3 is removed, the tape cassette 20 can be taken out from the cassette housing portion 21 upward. Further, it is possible to sequentially take out and replace the batteries 38 stored in the battery storage unit 27. At that time, the first and second protective members 15A, 15B, 16A, and 16B are divided into two parts between the upper casing 4, the lower casing 5, and the back cover 3, as described above. Therefore, the back cover 3 can be opened and closed with the protection members 15A, 15B, 16A, and 16B mounted on the apparatus main body 1. Further, a confirmation window 32 is provided at a portion facing the tape cassette 20 housed in the lower casing 5 of the back cover 3, and the protection member 15 </ b> B is attached to the back cover 3 without covering the confirmation window 32. ing. Therefore, the type of the tape cassette 20 stored in the cassette storage unit 21 can be confirmed through the confirmation window 32 without opening the back cover 3.

<Electrical configuration>
In the apparatus main body 1 of the present embodiment, when power necessary for a load (described later) is supplied from the AC adapter 34, supply of current from the battery 38 to the load is stopped, and power necessary for the load is supplied from the AC adapter 34. When not supplied, current is supplied from the battery 38 to the load. This prevents wasteful consumption of the battery. The electrical configuration of the apparatus main body 1 and the AC adapter 34 that performs such a function will be described with reference to FIGS. 4 and 5.

  4 and 5, in the tape printer 100 (electronic device) of this embodiment, the AC adapter 34 can be connected to the apparatus main body 1 as described above.

<Electrical configuration of AC adapter and its peripheral part>
The AC adapter 34 includes an AC plug 34C connected to the AC outlet side, a voltage converter 34D connected to the AC plug 34C, and a DC plug 34E (power supply terminal) connected to the voltage converter 34D. Have. The DC plug 34E is connected to the constant voltage circuit 47 via the first terminal 33A of the DC jack 33 and to the constant voltage circuit 47 via the second terminal 33B of the DC jack 33. 2 terminal 34B (ground side terminal). The first terminal 33A of the DC jack 33 is provided with a break contact 33C that is opened when the DC plug 34E is connected to the DC jack 33. The positive side of the battery 38 is connected to the break contact 33C. Yes. In case the break contact 33C is opened, a zener diode 43 and a diode 45 are connected in series between the positive side of the battery 38 and the constant voltage circuit 47 to constitute a bypass power supply circuit 46. . The break contact 33C and the first terminal 33A correspond to the switching mechanism described in each claim, and the bypass power supply circuit 46 corresponds to the power auxiliary means.

  When the DC plug 34E of the AC adapter 34 is not connected to the DC jack 33, as shown in FIG. 4, the break contact 33C is in a conductive state (first state). As a result, the voltage Vb on the positive side of the battery 38 is directly supplied to the constant voltage circuit 47 via the break contact 33C, converted into a predetermined voltage by the constant voltage circuit 47, and supplied to the control board 37. .

  When the DC plug 34E of the AC adapter 34 is connected to the DC jack 33, the break contact 33C is in an open state (second state) as shown in FIG. As a result, the voltage of the voltage conversion unit 34D of the AC adapter 34 is supplied to the constant voltage circuit 47 via the first terminal 34A of the DC plug 34E and the first terminal 33A of the DC jack 33.

<Other electrical configurations>
Further, the apparatus main body 1 includes a control board 37, the six batteries 38 connected in series, the DC jack 33 for connecting the AC adapter 34, a load 39 (load circuit), a load The supply switch 40 for controlling the power supply to the power supply 39, the resistor R1 (pull-up resistor) and the resistors R2, R3 (voltage dividing resistor) connected in series with each other, and the voltage applied to the control board 37 are stabilized. The constant voltage circuit 47, the bypass power supply circuit 46, a Zener diode Dz connected in parallel to the resistor R3, the anode side is connected to the negative side (GND) of the battery 38, and the cathode side is the second terminal of the DC jack 33. And a backflow prevention diode D1 connected to 33B, and the second terminal 33B of the DC jack 33 is connected between the pull-up resistor R1 and the resistor R2.

  The control board unit 37 temporarily stores the liquid crystal display 9, the A / D input unit 48 for measuring the voltage, the ROM 54 in which programs and data for operating the apparatus main body 1 are stored, the results calculated by the CPU 51, and the like. The RAM 55 is stored in the memory, and the CPU 51 that executes various programs stored in advance in the ROM 54 and performs overall control while utilizing the temporary storage function of the RAM 55 is provided.

  The DC jack 33 is a connection port for connecting the AC adapter 34 from the outside. When the AC adapter 34 is attached to the DC jack 33, as described above, the break contact 33C connected to the battery 38 and the first terminal 33A connected to the constant voltage circuit 47 are in a non-contact state. . As a result, power is supplied from the AC adapter 34 to each part of the apparatus main body 1 regardless of whether the battery 38 is attached or not (see FIG. 5). On the other hand, when the AC adapter 34 is not attached to the DC jack 33, the break contact 33 </ b> C connected to the battery 38 and the first terminal 33 </ b> A connected to the constant voltage circuit 47 are brought into contact with each other. Is supplied with electric power from the battery 38 (see FIG. 4).

  The supply switch 40 is connected to the CPU 51, and is turned on by the CPU 51 in the printing process using the thermal head 22 and the like, and is turned off in other processes other than the printing process.

  The load 39 includes the thermal head 22 and a drive motor (not shown) included in the tape transport mechanism described above. The load 39 is supplied with power from the battery 38 or the AC adapter 34 when the supply switch 40 is controlled to be turned on in a printing process to be described later, while the supply switch 40 is turned off in a process other than the printing process ( (Standby state) and no power is supplied.

  The pull-up resistor R1 and the resistors R2 and R3 are connected in series with each other. In this example, for example, the resistance values of R1, R2, and R3 are all set to 10 kΩ. As a result, the voltage Vad between the pull-up resistor R1 and the resistor R2 is a voltage obtained by dividing the voltage of the second terminal 33B of the DC plug 33 by a predetermined ratio (1/2 in this example). The A / D input unit 48 is connected to a connection point 53 between the voltage dividing resistor R2 and the voltage dividing resistor R3, and measures a voltage Vcn obtained by further dividing the voltage Vad by half.

  Further, the constant voltage circuit 47 stabilizes the voltage applied to the control board unit 37 to a predetermined value. In this embodiment, for example, the voltage is stabilized to 3 [V].

In the above, the switching mechanism including the break contact 33C and the first terminal 33A, the constant voltage circuit 47, and each element on the control board unit 37 (A / D input unit 48, CPU 51, RAM 55, ROM 54, liquid crystal display) 9) corresponds to the control circuit described in each claim.

<Features of this embodiment>
In the basic configuration described above, the greatest feature of the present embodiment is the detection of an abnormal connection state of the AC adapter 34 to the operator. The details will be described below.

  As described above, the tape printer 100 according to the present embodiment supplies power to the load 39 and the constant voltage circuit 47 of the apparatus body 1 by any of the battery 38 and the AC adapter 34 housed therein. It is configured to be possible. That is, when the operator uses the DC plug 34E of the AC adapter 34 without connecting the DC jack 33, as described above, the positive side of the battery 38 and the constant voltage circuit via the break contact 33C and the first terminal 33A. As a result, the power is supplied from the battery 38 to the constant voltage circuit 47 and the load 39. When the operator connects and uses the DC plug 34E of the AC adapter 34 and the DC jack 33, the positive side of the battery 38 and the constant voltage circuit 47 become non-conductive as described above (the second state described above). As a result, power is supplied from the AC adapter 34 to the constant voltage circuit 47 and the load 39.

  Here, despite the fact that the DC plug 34E and the DC jack 33 are connected and in the second state as described above, the AC adapter 34 is for some reason such as an operator's forgetfulness or an external force load on the AC adapter 34. There is a possibility that the AC plug 34C is not connected to the AC outlet side (or disconnected), and the power supply from the AC adapter 34 to the constant voltage circuit 47 is not performed.

  Alternatively, the operator may accidentally connect the DC plug 34E of the AC adapter 34 having the opposite polarity to the DC jack 33 to which the DC plug 34E of the AC adapter 34 having a predetermined polarity is to be connected. There is also sex. That is, in the AC adapter 34, as shown in FIG. 6A, the first terminal 34A of the DC plug 34E has a positive polarity and the second terminal 34B is used as a negative polarity, As shown in FIG. 6B, there are two types, a so-called center plus configuration in which the first terminal 34A opposite to this is negative and the second terminal 34B is used as positive. Therefore, in this example, there is a possibility that the operator accidentally connects the latter AC adapter 34 having the opposite polarity to the DC jack 33.

  In the connection abnormal state as described above, the power is not supplied from the battery 39 to the constant voltage circuit 47 or the load 39 by switching to the second state, but the constant voltage circuit 47 or No power is supplied to the load 39.

<Detection of connection abnormality using voltage Vcn>
Therefore, in the present embodiment, the voltage Vcn (the voltage Vad divided by half) at the connection point 53 between the resistor R2 and the resistor R3 is A / D converted and then input to the CPU 51. The connection abnormality is detected using the change behavior of the voltage Vcn. Hereinafter, the detection principle will be described with reference to FIGS.

  In the following description, as an example, the terminal voltage Vcc of the pull-up resistor R1 = 3 [V], the positive voltage Vb = 9 [V] of the battery 38, the pull-up resistor R1, and the resistors R2 and R3, respectively. The resistance value is 10 [KΩ], the holding voltages Vz = 4.4 [V] and Vf = 0.6 [V] in the Zener diode 43 and the diode 45 of the bypass power supply circuit 46, respectively, and the holding voltage of the backflow preventing diode D1 (Forward voltage drop) 0.6 [V], clamp voltage of zener diode Dz 2.8 [V], and proper AC adapter 34 is rated negative voltage 9 [V] and center negative polarity I will explain to you.

(A) No adapter connection First, assume that the AC adapter 34 and the DC jack 33 are not connected as shown in FIG. In this case, as already described in FIG. 7, the break contact 33C and the first terminal 33A are in a conductive state, and the second terminal 33B on the cathode side of the diode D1 is in a so-called floating state with respect to GND. As a result, the terminal voltage Vcc at the pull-up resistor R1 is simply divided by the three resistors R1, R2, and R3. That is, the voltage Vad between the pull-up resistor R1 and the voltage dividing resistor R2 is 2 [V], and the voltage Vcn between the voltage dividing resistors R2 and R3 is 1 [V].

(B) Appropriate Adapter Connection Next, assume that the AC adapter 34 and the DC jack 33 are connected as shown in FIG. In this case, as already described with reference to FIG. 8, the first terminal 34A of the AC adapter 34 and the first terminal 33A of the DC jack 33 are electrically connected, and the second terminal 34B of the AC adapter 34 and the first terminal 33A of the DC jack 33 are electrically connected. When the two terminals 33B are electrically connected, the first terminal 34A side of the AC adapter 34 has a positive potential and the second terminal 34B side has a negative potential. At this time, since a forward current flows through the diode D1 and the holding voltage is 0.6 [V] as described above, the voltage with respect to the GND of the second terminal 33B on the cathode side of the diode D1 is −0. .6 [V]. As a result, the voltage Vad also becomes −0.6 [V] by being clamped by the backflow preventing diode D1. As a result, the voltage Vad is simply divided by the two resistors R2 and R3, and the voltage Vcn between the voltage dividing resistors R2 and R3 becomes −0.3 [V].

(C) Inappropriate adapter connection Next, the case where the above-mentioned inappropriate AC adapter 34 and DC jack 33 are connected is assumed. In this case, as described above, the first terminal 34A of the AC adapter 34 and the first terminal 33A of the DC jack 33, and the second terminal 34B of the adapter 34 and the second terminal 33B of the DC jack 33 are electrically connected. However, since the polarity is reversed, the first terminal 34A side of the AC adapter 34 has a negative potential, the second terminal 34B side has a positive potential, and the potential on the second terminal 34B side is 9 [ V] becomes higher.

  Here, as described above, the voltage Vb on the positive electrode side of the battery 38 is 9 [V]. However, since the voltage drop in the bypass power supply circuit 46 is 5 [V] as described above, Supply voltage Vbp at the exit is 4 [V]. When this voltage Vbp is applied to the first terminal 34A side, the voltage on the second terminal 34B side becomes 13 [V], and the voltage Vad also becomes 13 [V]. When the voltage Vad is simply divided by the two resistors R2 and R3, the voltage Vad becomes 6.5 [V]. However, as described above, the clamp voltage of the Zener diode Dz is set (to prevent circuit damage due to high voltage application). Therefore, the voltage Vcn between the voltage dividing resistors R2 and R3 is 2.8 [V].

(D) Adapter plug disconnection Next, the AC adapter 34 and the DC jack 33 are connected as shown in FIG. 5 described above. However, for some reason, the AC plug 34C of the AC adapter 34 is disconnected, and the AC adapter 34 is connected to the primary side. Assume that no power is supplied. In this case, as already described in FIG. 10, the first terminal 34A of the AC adapter 34 and the first terminal 33A of the DC jack 33 are electrically connected, and the second terminal 34B of the AC adapter 34 and the first terminal of the DC jack 33 are connected. The two terminals 33B are electrically connected. However, since the primary side power is not supplied and there is no output from the AC adapter 34, the first terminal 34A side and the second terminal 34B side of the AC adapter 34 have substantially the same potential. As a result, the supply voltage Vbp at the outlet of the bypass power supply circuit 46, the voltage on the first terminal 34A side, and the voltage on the second terminal 34B side are all 4 [V], and the voltage Vad is also 4 [V]. . The voltage Vad is simply divided by the two resistors R2 and R3, and the voltage Vcn between the voltage dividing resistors R2 and R3 is 2.0 [V].

  Corresponding to the above behavior, the CPU 51 determines that the current status is “adapter not connected”, “appropriate adapter connected”, “inappropriate adapter connected”, “adapter” based on a comparison between the input voltage Vcn and a predetermined threshold value. It is determined whether it corresponds to “unplugged plug”. Under the control of the CPU 51, display (visual notification) corresponding to the determination result is performed on the liquid crystal display 9. Specifically, when the voltage Vcn is 0.8 [V] to 1.2 [V] (first voltage range), it is determined to be in the “adapter not connected” state (adapter not connected state), “Adapter is not connected” is displayed on the liquid crystal display 9. Further, when the voltage Vcn is 0.2 [V] or less (second voltage range), it is determined that the state is “appropriate adapter connection” (adapter normal connection state), and the “appropriate adapter is connected to the liquid crystal display 9”. Is displayed. " Further, when the voltage Vcn is 1.8 [V] to 2.2 [V] (third voltage range), it is determined to be in the “adapter unplugged” state (adapter unpowered state), and the liquid crystal display 9 shows “Is the adapter disconnected from the outlet?”. Further, when the voltage Vcn is 2.6 [V] or more (fourth voltage range), it is determined that the state is the “inappropriate adapter connection” state (adapter reverse polarity connection state), and the liquid crystal display 9 displays “inappropriate” The adapter is connected. The polarity is reversed. Please remove it immediately. ”Is displayed.

<Control procedure>
A control procedure executed by the CPU 51 to realize the above will be described with reference to FIG. In FIG. 11, first, in step S <b> 1, the CPU 51 acquires the voltage Vcn measured by the A / D input unit 48. Thereafter, the process proceeds to step S2.

  In step S2, the CPU 51 determines whether or not the value of the voltage Vcn acquired in step S1 is 0.2 [V] or less. If the voltage Vcn is 0.2 [V] or less, the determination is satisfied, and the routine goes to Step S3.

In step S3, the CPU 51 outputs a control signal to the liquid crystal display 9, displays “appropriate adapter is connected” as described above, and ends this flow.

  On the other hand, if the voltage Vcn is greater than 0.2 [V] in step S2, the determination is not satisfied, and the routine goes to step S4.

  In step S4, the CPU 51 determines whether or not the value of the voltage Vcn acquired in step S1 is 0.8 [V] or more and 1.2 [V] or less. If the voltage Vcn is within this range, the determination is satisfied, and the routine goes to Step S5.

In step S5, the CPU 51 outputs a control signal to the liquid crystal display 9, displays "No adapter connected" as described above, and ends this flow.

  On the other hand, if the voltage Vcn is greater than 1.2 [V] or less than 0.8 [V] in step S4, the determination is not satisfied and the process proceeds to step S6.

  In step S6, the CPU 51 determines whether or not the value of the voltage Vcn acquired in step S1 is 1.8 [V] or more and 2.2 [V] or less. If the voltage Vcn is within this range, the determination is satisfied, and the routine goes to Step S7.

In step S7, the CPU 51 outputs a control signal to the liquid crystal display 9, displays "Is the adapter disconnected from the outlet?" As described above, and ends this flow.

  On the other hand, if the voltage Vcn is greater than 2.2 [V] or less than 1.8 [V] in Step S6, the determination is not satisfied, and the routine goes to Step S8.

  In step S8, the CPU 51 determines whether or not the value of the voltage Vcn acquired in step S1 is 2.6 [V] or more. If the voltage Vcn is 2.6 [V] or higher, the determination is satisfied, and the routine goes to Step S9.

In step S9, the CPU 51 outputs a control signal to the liquid crystal display 9 to display "Inappropriate adapter is connected. Since it is the opposite characteristic, please remove it immediately", and this flow is finished. To do.

  On the other hand, if the voltage Vcn is less than 2.6 [V] in step S8, the determination is not satisfied, and the routine goes to step S10.

In step S10, the CPU 51 outputs a control signal to the liquid crystal display 9 to display a determination error, and ends this flow.

  In addition, in the above, step S2, step S4, step S6, and step S8 function as a voltage determination unit described in each claim, and also function as a connection abnormality detection unit.

  As described above, in the present embodiment, the abnormal connection state of the AC adapter 34 is detected according to the change behavior of the voltage value of the second terminal 33 </ b> B of the DC jack 33 input to the CPU 51, and the abnormal connection is detected. At the time of detection, the liquid crystal display 9 performs a corresponding notification. As a result, the operator can be informed that the connection is abnormal as described above, and can surely recognize the cause of the operational inconvenience.

  In this embodiment, in particular, even in the second state in which the DC plug 34E of the AC adapter 34 is connected to the DC jack 33 and the positive side of the battery 38 is disconnected from the load 39 and the constant voltage circuit 47, the bypass is performed. The power supply circuit 46 ensures power supply from the battery 38 to the constant voltage circuit 47. However, the bypass power supply circuit 46 cannot supply power to the load 39 because the allowable current is small. Then, the CPU 51 operates with the electric power secured in this way, and the abnormal connection state is detected according to the change behavior of the voltage value of the second terminal 33B. It can be performed.

  In the present embodiment, in particular, the CPU 51 sets the voltage Vcn to a predetermined threshold value (in the example of FIG. 11, 0.2 [V], 0.8 [V], 1.2 [V], 1.8 [V]). V], 2.2 [V]) can be identified only by comparing the size with the adapter non-connected state, the adapter normal connected state, or the adapter non-powered state. When at least the voltage Vcn is in the range of 1.8 [V] to 2.2 [V], the operator recognizes that the adapter is in a non-powered state by performing a corresponding notification. Can be made.

  Furthermore, the CPU 51 can determine whether or not it is in the above-described reverse polarity connection state only by comparing the magnitude of the voltage Vcn with another threshold value (2.6 [V] in the example of FIG. 11). And when voltage Vcn is 2.6 [V] or more, it can make an operator recognize that it is the above-mentioned reverse polarity connection state by performing corresponding notice.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order.

(1) When using other external power supply apparatus In the above, although the case where the AC adapter 34 was provided as an external power supply apparatus was demonstrated as an example, it is not restricted to this. That is, instead of the AC adapter 34, a power cord unit 134 (external power supply device) with a cigar plug shown in FIG. 12 may be used to supply power to the apparatus body 1.

  In this case, the power cord unit 134 has an electrical configuration equivalent to that of the AC adapter 34, and an AC plug 134C connected to the AC outlet side, and a voltage converter (not shown) connected to the AC plug 134C. And a DC plug 134E (power supply terminal). The DC plug 134E includes a first terminal (not shown) connected to the constant voltage circuit 47 via the first terminal 33A of the DC jack 33 and a constant voltage circuit 47 via the second terminal 33B of the DC jack 33. And a second terminal (not shown; ground side terminal) connected to the terminal.

  When the DC plug 134E of the power cord unit 134 is not connected to the DC jack 33, the break contact 33C becomes conductive (first state) as in FIG. The voltage is supplied directly to the constant voltage circuit 47 via the break contact 33C. When the DC plug 134E of the power cord unit 134 is connected to the DC jack 33, the break contact 33C is in an open state (second state) as in FIG. The voltage is supplied to the constant voltage circuit 47 through the first terminal of the DC plug 134E and the first terminal 33A of the DC jack 33.

  Also in the present modification, as in the above embodiment, the abnormal connection state of the power cord unit 134 is detected according to the change behavior of the voltage value of the second terminal 33B of the DC jack 33 input to the CPU 51, and the connection When an abnormality is detected, the liquid crystal display 9 performs a corresponding notification. As a result, the operator can be informed that the connection is abnormal as described above, and can surely recognize the cause of the operational inconvenience.

(2) Others In addition, in the above, the arrows shown in FIGS. 4, 5, 7, 8, 9, 10 and so on show an example of the signal flow, and indicate the signal flow direction. It is not limited.

  In addition, the flowchart shown in FIG. 11 does not limit the present invention to the procedure shown in the above-described flow, and the procedure may be added or deleted or the order may be changed without departing from the spirit and technical idea of the invention. Good.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 Device body 33 DC jack 34 AC adapter (external power supply)
34E DC plug 46 Current control mechanism (power auxiliary means)
100 Tape printer (electronic equipment)
134 Power cord unit (external power supply)

Claims (2)

A DC jack on the device main body side connected to a DC plug of a predetermined polarity provided in an AC adapter which is an external power supply device capable of supplying power;
A load circuit to which power is supplied via the DC jack;
A battery storage section for storing a battery connected to be able to supply power to the load circuit;
An electronic device for notifying an abnormal connection of a power source,
When the DC plug of the AC adapter is not connected to the DC jack, the battery is switched to a first state in which the positive electrode side of the battery and the load circuit are electrically connected, and the DC plug of the AC adapter is connected to the DC jack. Sometimes, the switching mechanism that switches to the second state in which the positive electrode side of the battery and the load circuit are non-conductive, the switching mechanism switches to the second state, and the power required for the load circuit is the AC A connection abnormality detection unit that detects a connection abnormality state that is not supplied from the adapter to the load circuit; and a connection abnormality notification unit that performs a corresponding notification when the connection abnormality detection unit detects the connection abnormality state; A control circuit having
To ensure power supply from the battery to the control circuit when the switching mechanism is switched to the second state and power necessary for the load circuit is not supplied from the AC adapter to the load circuit. Power auxiliary means,
Have
The connection abnormality detecting means is
Operates based on the power secured by the power auxiliary means, detects the abnormal connection state according to the change behavior of the voltage value of the ground side terminal of the DC jack,
The voltage value of the ground side terminal of the DC jack or the partial pressure value thereof is
A first voltage range corresponding to an adapter non-connecting state in which the switching mechanism is switched to the first state to supply power necessary for the load circuit;
Or
When the switching mechanism is switched to the second state, the AC adapter supplies the power necessary for the load circuit, the second voltage range corresponding to the adapter normal connection state,
Or
The switching mechanism is switched to the second state, and the battery supplies power necessary for the control circuit to the constant voltage circuit provided in the control circuit via the power auxiliary means. The corresponding third voltage range,
An electronic device for notifying a power supply connection abnormality, characterized in that the electronic device is a voltage determination means for determining which one of the two. In the electronic apparatus which alert | reports the connection abnormality of the power supply of Claim 1,
The voltage determination means includes
The voltage value of the ground side terminal of the DC jack or the partial pressure value thereof is
The first voltage range, or the second voltage range, or the third voltage range, or
A fourth voltage range corresponding to an adapter reverse polarity connection state, in which the DC plug and the DC jack are connected with a polarity opposite to the predetermined polarity;
An electronic device for notifying a connection abnormality of a power source, characterized in that it belongs to any of the above.

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