JP7487512B2 - Electronic Equipment Systems - Google Patents

Description

The present invention relates to an electronic device system.

In electronic devices, a phenomenon known as a hang-up or freeze can occur, where the screen does not change at all, the device stops working, and no input is accepted, making it necessary to reset the device. In response to such situations, a technology has been proposed that resets the control unit by, for example, pressing and holding a specific physical button (see Patent Document 1).

Japanese Patent Application Laid-Open No. 7-182070

In order to improve design and water resistance, information devices that are not provided with physical buttons have been proposed. However, because such information devices are not provided with physical buttons, the technology invented in Patent Document 1 cannot be applied, and the control unit cannot be reset. Even if a physical button is provided, it is possible that the reset function is not assigned to the button.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide an electronic device that can be reset without using a physical button.

In order to achieve the above object, the electronic device system of the present invention comprises:
an electronic device including: a power receiving means for receiving power from an external source and having a first connection terminal and a second connection terminal as a pair of power receiving terminals ; a characteristic detection means for detecting a characteristic of the received power; a control unit for controlling the device itself; and a process execution means for performing a process of charging the device itself when the characteristic detected by the characteristic detection means is a first characteristic, and performing a process of resetting the control unit when the characteristic detected by the characteristic detection means is a second characteristic ;
a power supply device including: a plug having a third connection terminal and a fourth connection terminal connected to the pair of power receiving terminals and supplying the power; power output means capable of generating and outputting power having predetermined characteristics and changing characteristics of the output power in response to a received instruction; instruction receiving means; and a restriction member that restricts connection so that only the first connection terminal and the third connection terminal, and the second connection terminal and the fourth connection terminal are connected, and that is removable and physically restricts interconnection of the terminals;
When the restricting member is removed, the first connection terminal and the fourth connection terminal, and the second connection terminal and the third connection terminal are allowed to be connected to each other .

The above configuration provides an electronic device that can be reset without using a physical button.

1 is a perspective view showing a configuration of an electronic device system according to an embodiment of the present invention. 1 is a schematic diagram showing the configuration of a power adapter and an electronic device according to an embodiment of the present invention; FIG. 2 is a schematic diagram showing a configuration of a control unit according to the embodiment of the present invention. FIG. 1 is a diagram showing a reset circuit according to an embodiment of the present invention. 1A-1 is a plan view and a front view showing the shape of a plug in a normal connection state, FIG. 1A-2 is a plan view and a front view showing the shape of a receptacle in a normal connection state, FIG. 1B-1 is a plan view and a front view showing the shape of a plug in a reset execution state, and FIG. 1B-2 is a plan view and a front view showing the shape of a receptacle in a reset execution state. FIG. 2 is a schematic diagram showing the configuration of a power adapter. FIG. 2 is a schematic diagram showing a configuration of a power receiving antenna. FIG. 2 is a schematic diagram showing a circuit configuration during hardware interrupt processing; FIG. 13 is a diagram showing a table to which a characteristic detection circuit refers;

The following describes an electronic device, a power supply device, and an electronic device system according to an embodiment of the present invention with reference to the drawings. Note that the same components are denoted by the same reference numerals in each drawing.

(Embodiment 1)
1, an electronic device system 30 according to the present embodiment is composed of a power adapter 10, which is a power supply device, and an electronic device 20 that operates by receiving power from the power adapter 10. The electronic device 20 does not include physical buttons. The power adapter 10, which is a power supply device, is an example of an external device.

As shown in FIG. 2, the power adapter 10 includes a power adapter main body 11, which generates a predetermined DC voltage V1 from a commercial power source 12 and outputs it to a plug 13, as an example of a power output means. As shown in FIG. 6, the plug 13 has a positive connection terminal T+ and a negative connection terminal T-, and applies a DC voltage V1 between the positive connection terminal T+ and the negative connection terminal T-. The voltage of the positive connection terminal T+ is higher than the voltage of the negative connection terminal T-. Here, the positive connection terminal T+ is an example of a third connection terminal, and the negative connection terminal T- is an example of a fourth connection terminal.

On the other hand, the electronic device 20 includes a power receiving unit 21 as a power receiving means, a charging circuit 22 as an example of a charging means, a secondary battery 23, a power supply circuit 24, a control unit 25 that controls the electronic device 20, i.e., the device itself, a touch panel 26, a characteristic detection circuit 27, and a reset circuit 28.

The power receiving unit 21 has a receptacle 21a to which the plug 13 of the power adapter 10 is removably attached. The receptacle 21a has a first connection terminal T1 and a second connection terminal T2. The first connection terminal T1 and the second connection terminal T2 are an example of a pair of power receiving terminals.

Depending on the orientation of the plug 13 when it is attached to the receptacle 21a, it is possible to switch between a state in which the positive connection terminal T+ is connected to the first connection terminal T1 and the negative connection terminal T- is connected to the second connection terminal T2 (hereinafter, forward connection), and a state in which the negative connection terminal T- is connected to the first connection terminal T1 and the positive connection terminal T+ is connected to the second connection terminal T2 (hereinafter, reverse connection). However, in normal use, it is attached in the forward connection. Therefore, in the normal connection state, the voltage of the first connection terminal T1 is V1 (first voltage value), and the voltage of the second connection terminal T2 is ground (second voltage value). This is an example of the first characteristic.

The charging circuit 22 is connected to the first connection terminal T1 and the second connection terminal T2. The characteristic detection circuit 27 also supplies the charging circuit 22 with a detection signal based on the detection result. When the detection signal is at a high level, that is, when the voltage value of the first connection terminal T1 is higher than the voltage value of the second connection terminal T2, the charging circuit 22 generates a charging voltage Vcc from the supplied DC voltage V1 and supplies it to the secondary battery 23 and the power supply circuit 24. The circuit characteristic detection circuit 27 supplies the charging circuit 22 with a detection signal. The charging circuit 22 is an example of a processing execution means that performs a process of charging the device when the characteristic is that the voltage value of the first connection terminal T1 is higher than the voltage value of the second connection terminal T2. The charging circuit 22 is also an example of a charging control unit that controls charging.

The secondary battery 23 is a rechargeable and dischargeable battery that is charged by the charging voltage Vcc output by the charging circuit 22, and when the charging voltage Vcc is not being applied from the charging circuit 22, it outputs a voltage Vb to the power supply circuit 24.

The power supply circuit 24 is composed of a voltage regulator, and receives the charging voltage Vcc output by the charging circuit 22 or the output voltage Vb of the secondary battery 23, generates a power supply voltage Vdd, and supplies it to the control unit 25. This power supply voltage Vdd is an example of operating power. The power supply circuit 24 also supplies the necessary operating power to the charging circuit 22, the power supply circuit 24 itself, the touch panel 26, the characteristic detection circuit 27, and the reset circuit 28.

The control unit 25 is composed of a one-chip microprocessor, and as shown in FIG. 3, includes a CPU (Central Processing Unit) 251, a RAM (Random Access Memory) 252, a ROM (Read Only Memory) 253, and an interface circuit 254.

The CPU 251 executes the control program stored in the ROM 253 to control the device itself (i.e., the electronic device 20) and thereby realizes various functions of the device itself. The functions realized by the control program stored in the ROM 253 include a function to display images including icons, buttons, etc. on the touch panel 26 having a display unit, and a function to detect operations on the touch panel 26. In this way, input and output of the electronic device 20 requires processing by the control unit 25. For this reason, if the control unit 25 hangs up for some reason, no input or output is possible.

The RAM 252 functions as a work area for the CPU 251 .
The ROM 253 stores a basic input/output program and a plurality of control programs.
The interface circuit 254 performs input/output with peripheral devices such as the touch panel 26 shown in FIG.

The control unit 25 is composed of a one-chip microprocessor, and operates when a power supply voltage Vdd is applied between the power supply terminal and the ground terminal. The control unit 25 is also reset when a low-level reset signal is applied to the reset terminal.

The touch panel 26 is one type of input/output device, and is configured by stacking a display device and a transparent contact sensor. The touch panel 26 displays various images including an input screen under the control of the control unit 25, detects user operations, and notifies the control unit 25. Input/output of the electronic device 20 is performed by the control unit 25 via the touch panel 26. For this reason, if the control unit 25 hangs up, input/output becomes difficult.

The characteristic detection circuit 27 is an example of a characteristic detection means for detecting the physical characteristics of the power provided through the first connection terminal T1 and the second connection terminal T2. Examples of characteristics include voltage, polarity, frequency, and waveform. In this embodiment, the characteristic detection circuit 27 determines whether the voltage of the first connection terminal T1 is positive or negative relative to the voltage of the second connection terminal T2. When the characteristic detection circuit 27 determines that the voltage of the first connection terminal T1 is positive, it outputs a high-level determination signal to the charging circuit 22 and the reset circuit 28, and when it determines that the voltage is negative, it outputs a low-level determination signal to the charging circuit 22 and the reset circuit 28. Here, positive polarity is an example of a first characteristic, and negative polarity is an example of a second characteristic.

The reset circuit 28 is a circuit for resetting the control unit 25. The reset circuit 28 outputs a low-level reset signal to the reset terminal /Reset of the control unit 25 when the power is turned on and when the characteristic detection circuit 27 detects that the voltage of the first connection terminal T1 is negative relative to the voltage of the second connection terminal T2. The reset circuit 28 is an example of a process execution means that resets the control unit 25 when the characteristic detected by the characteristic detection circuit 27 is a specific characteristic.

As shown in FIG. 4, the reset circuit 28 includes a power-on reset circuit 280, a power reset circuit 290 that outputs a reset signal when the characteristic detection circuit 27 detects that the voltage at the first connection terminal T1 is negative, and an AND circuit 282 that takes the logical product of the two reset signals.

The power-on reset circuit 280 outputs a reset signal when the power supply circuit 24 starts outputting the power supply voltage Vdd. Any general circuit can be used as the power-on reset circuit 280.

The power supply reset circuit 290 outputs a reset signal when the characteristic detection circuit 27 detects that the voltage at the first connection terminal T1 is negative with respect to the voltage at the second connection terminal T2. The circuit configuration of the power supply reset circuit 290 can be any circuit that outputs a low-level pulse having a predetermined pulse width when the characteristic detection circuit 27 outputs a low-level detection signal. In FIG. 4, the circuit includes a delay circuit 291 that delays the detection signal by a predetermined time, pull-up resistors 292 and 293 that pull up the delayed signal and the detection signal, an EXOR (exclusive OR) circuit 294 that takes the exclusive OR of both signals, and an inverter circuit 295 that inverts the signal level of the output signal of the EXOR circuit 294 and outputs it.

The AND circuit 282 takes the logical product of the output of the power-on reset circuit 280 and the output of the power reset circuit 290, and when at least one of them becomes low level, outputs a low-level reset signal to the reset terminal /Reset of the control unit 25.

Next, the operation of the electronic device system 30 having the above configuration will be described.
When charging the electronic device 20, the user inserts the plug 13 of the power adapter 10 into the receptacle 21a of the power receiving unit 21 of the electronic device 20 in the forward direction, contacting the positive connection terminal T+ with the first connection terminal T1 and the negative connection terminal T- with the second connection terminal T2. At this time, the characteristic detection circuit 27 detects the characteristic of the received power as the first characteristic and outputs a high-level detection signal. In response to the detection signal, the charging circuit 22 generates a charging voltage Vcc from the voltage V1 and charges the secondary battery 23. In other words, the device itself is charged.

The power supply circuit 24 supplies the power supply voltage Vdd to the control unit 25 when the plug 13 is inserted into the receptacle 21a and the charging voltage Vcc is supplied from the charging circuit 22, or when the output voltage Vb of the secondary battery 23 is supplied.

The control unit 25 consumes power supplied from the power supply circuit 24 to operate, executes a control program, displays images on the touch panel 26, and operates according to instructions from the touch panel 26 to realize the functions of the electronic device 20.

Even if the plug 13 is removed from the receptacle 21a, the control unit 25 can operate as long as energy is stored in the secondary battery 23, because the power supply circuit 24 supplies the power supply voltage Vdd from the output of the secondary battery 23.

In this normal operating state, the user can reset the control unit 25 by inputting an instruction from the touch panel 26 as necessary. In this case, the control unit 25, for example, causes the power supply circuit 24 to stop outputting the power supply voltage Vdd. The power supply circuit 24 stops outputting the power supply voltage Vdd for a certain period of time under the control of the control unit 25, and sets the output voltage to the ground level. As a result, the control unit 25 is temporarily shut down. After a certain period of time has elapsed, the power supply circuit 24 restores the output voltage to the power supply voltage Vdd. As a result, the control unit 25 resumes operation. Meanwhile, after the power supply voltage Vdd is restored, the power-on reset circuit 280 outputs a low-level reset signal. At this time, the two input signals of the EXOR circuit 294 are pulled up, and the output signal of the inverter circuit 295 is at a high level. As a result, the control unit 25 is reset and resumes operation.

Here, it is assumed that the control unit 25 hangs up for some reason.
In this case, the image displayed on the touch panel 26 does not change, and the operation of the user on the touch panel 26 is not recognized. Therefore, it is necessary to reset the control unit 25. However, the reset instruction cannot be given from the touch panel 26.

In this case, the user connects the plug 13 of the power adapter 10 to the receptacle 21a of the electronic device 20 in the reverse direction. Then, the characteristic detection circuit 27 detects that the voltage of the first connection terminal T1 is negative with respect to the voltage of the second connection terminal T2 (second characteristic), and outputs a low-level detection signal to the charging circuit 22 and the reset circuit 28. In response to this detection signal, the charging circuit 22 stops outputting the charging voltage Vcc, and the secondary battery 23 is not charged.

Meanwhile, the low-level detection signal is supplied directly to one input terminal of the EXOR circuit 294, and is also delayed by a certain time by the delay circuit 291 and supplied to the other input terminal of the EXOR circuit 294. The EXOR circuit 294 outputs a high-level signal for a certain period of time during which the detection signal is at a low level and the delayed signal is at a high level. The inverter circuit 295 inverts this to a low level and outputs it. In response to the input of the low-level signal, the AND circuit 282 outputs a low-level reset signal to the reset terminal /Reset of the control unit 25. In response to this reset signal, the control unit 25 resets itself, then performs a specified initialization process, etc., and then returns to a normal operating state, accepts input from the touch panel 26, and restores the function of updating the display of the touch panel 26.

During this time, the delay time of the delay circuit 291 elapses, both inputs to the EXOR circuit 294 become high level, its output becomes low level, and the output of the AND circuit 282 returns to high level.

As described above, according to this embodiment, even if the control unit 25 hangs up and no longer accepts input operations from the touch panel 26, the control unit 25 can be reset and the electronic device 20 can be restored to a normal operating state. Furthermore, the power adapter 10 has a general configuration, and there is no need to prepare a dedicated device for resetting.

In the above explanation, the charging circuit 22 determines the polarity of the voltage V1 supplied from the power adapter 10 based on the detection signal from the characteristic detection circuit 27, but it may also determine the polarity of the applied voltage by itself.

In the above explanation, the secondary battery 23 is charged only when the plug 13 is connected to the receptacle 21a in the forward direction, but it may be configured to be charged at all times. In this case, for example, a full-wave rectifier circuit may be placed at the input end of the charging circuit 22 to generate a charging voltage Vcc and charge the secondary battery 23 regardless of whether the input voltage is +V1 or -V1. In this case, there is no need to supply a detection signal from the characteristic detection circuit 27 to the charging circuit 22.

In the above description, the voltage between the first connection terminal T1 and the second connection terminal T2 is measured to determine whether the plug 13 is connected to the receptacle 21a in the forward direction or in the reverse direction. The present invention is not limited to this. It is also possible to mechanically determine the direction of attachment of the plug 13. For example, a sensor such as a microswitch or optical switch may be provided in the receptacle 21a, the plug 13 may be formed in an asymmetric shape, and the sensor may be arranged so that the sensor is on when the plug 13 is attached in the forward direction and off when the plug 13 is attached in the reverse direction, and the direction of attachment of the plug 13 may be determined by the on/off state of the sensor. Furthermore, it is also possible to use a microswitch and arrange the microswitch so that the microswitch is on when the plug 13 is attached in the forward direction and off when the plug 13 is attached in the reverse direction.

(Embodiment 2)
In the first embodiment, it has been described that plug 13 can be connected to receptacle 21a in both the forward and reverse directions. However, it is desirable to prevent reverse connection in the normal state. Below, a connector configuration is described that allows only forward connection under normal conditions and allows reverse connection upon reset. Here, the forward direction and reverse direction are examples of the first direction and the second direction, respectively.

Figure 5 (A-1) shows a front view and a plan view of plug 13. As shown in the figure, plug 13 has a positive connection terminal T+ and a negative connection terminal T- on the mating surface with receptacle 21a, and protrusions 13A and 13B as restricting members that function as restricting means to prevent reverse insertion. Protrusions 13A and 13B differ from each other in size, shape, position, etc. Furthermore, protrusions 13A and 13B are detachably attached to plug 13.

Figure 5 (A-2) is a front view and a plan view of the receptacle 21a of the electronic device 20. As shown in the figure, the receptacle 21a has first and second connection terminals T1, T2, and recesses 21aA, 21aB that can be fitted onto the protrusions 13A, 13B of the plug 13.

In the normal state, the protrusions 13A and 13B are attached to the plug 13. In this state, the large-sized protrusion 13B cannot fit into the recessed portion 21aA, so the plug 13 and the receptacle 21a can only be connected in the forward direction. In other words, the protrusions 13A and 13B and the recessed portions 21aA and 21aB are an example of a connection restriction means that physically restricts the interconnection of the terminals.

On the other hand, when resetting the control unit 25, the user removes the protrusions 13A and 13B as shown in FIG. 5 (B-1). In FIG. 5 (B-1), the areas where the protrusions 13A and 13B have been removed are shown in grey as 13C and 13D, respectively. For example, red marks or cautions are exposed in these areas, which serve as a warning that the card can be inserted backwards.

In this state, there are no protrusions 13A and 13B, so there is no interference from the protrusions. This makes it possible to attach the plug 13 to the receptacle 21a in the opposite direction. This connects the negative connection terminal T- to the first connection terminal T1 and the positive connection terminal T+ to the second connection terminal T2, and the reset process described above is executed.

The configuration for preventing reverse connection is not limited to the above configuration and is arbitrary. For example, only the protrusion 13B may be removable. Also, the protrusion and recess may be in only one combination that fits together when connecting in the forward direction and does not fit together when connecting in the reverse direction.

(Embodiment 3)
In the above-mentioned embodiments 1 and 2, the control unit 25 is reset by reversing the polarity of the voltage applied to the two connection terminals T1, T2 of the electronic device 20, but the characteristics of the power for resetting the control unit 25 are arbitrary.

For example, it may be set so that normal operation occurs when the voltage of the first connection terminal T1 relative to the voltage of the second connection terminal T2 is V1, and reset processing occurs when the voltage is V2. In this case, for example, as shown in FIG. 6, the main body 11 of the power adapter 10 is composed of an AC (alternating current)-DC (direct current) converter with a variable output voltage, and is equipped with an operation button 14. The power adapter main body 11 outputs voltage V1 when the operation button 14 is not pressed, and outputs voltage V2 when it is pressed.

When the characteristic detection circuit 27 detects a voltage V1 between the first connection terminal T1 and the second connection terminal T2, it maintains the detection signal at a high level, and when it detects a voltage V2, it sets the detection signal to a low level.

When the user wishes to reset the control unit 25, he or she inserts the plug 13 into the receptacle 21a and presses the operation button 14 on the power adapter main body 11. This causes the power adapter main body 11 to generate a voltage V2 between the positive connection terminal T+ and the negative connection terminal T-. The characteristic detection circuit 27 detects the voltage V2 and sets the detection signal to a low level. This causes the reset circuit 28 to output a reset signal to the reset terminal /Reset of the control unit 25.

(Embodiment 4)
In the above first to third embodiments, the power adapter 10 supplies a DC voltage to the electronic device 20, but it may also supply an AC voltage. In this case, for example, the power adapter main body 11 is composed of an AC-AC conversion circuit, and generates and outputs an AC voltage of a voltage V1 and a frequency f1 suitable for the electronic device 20 from the commercial power source 12. The electronic device 20 receives this AC voltage at the power receiving unit 21, and performs processes such as voltage conversion, rectification, and smoothing in the charging circuit 22 to generate a charging voltage Vcc.

When the operation button 14 is pressed, the power adapter main body 11 changes the output voltage to V2 and the frequency to f2. Meanwhile, the electronic device 20 receives this AC voltage at the power receiving unit 21, and performs processes such as voltage conversion, rectification, and smoothing in the charging circuit 22 to generate the charging voltage Vcc. Furthermore, the characteristic detection circuit 27 detects that the voltage value of the supplied voltage is V2 and the frequency is f2, and sets the detection signal to a low level. This causes the reset circuit 28 to output a reset signal to the reset terminal /Reset of the control unit 25.

It is not necessary for power adapter 10 to change both the voltage and the frequency for resetting, and it is also possible to change only one of them. In this case, characteristic detection circuit 27 only needs to detect the characteristic to be changed, for example, the voltage value or the frequency.
(Modification)
The characteristics of the received power that instruct a reset are exemplified by polarity, voltage value, and frequency, but are not limited to these and may be, for example, a distinction between AC and DC, an AC voltage value, a waveform such as a distinction between a sine wave and a square wave, etc. However, the characteristics are not limited to these and anything that can be detected is applicable.

(Embodiment 5)
In the above embodiment, an example has been shown in which power adaptor 10 and electronic device 20 are connected by wire, but so-called wireless power supply may also be used.
In wireless power supply, for example, electromagnetic induction is used, and the power adapter 10 generates an alternating magnetic field, for example, at a frequency f1. The power receiving unit 21 of the electronic device 20 includes, for example, a power receiving antenna composed of a coil 21C, as shown in Fig. 7, and supplies a voltage generated in the coil 21C by electromagnetic induction to the charging circuit 22 and the characteristic detection circuit 27 via the first connection terminal T1 and the second connection terminal T2.

The power adapter 10 has an operation button 14, and when the operation button 14 is operated, the frequency of the alternating magnetic flux is changed from f1 to f2. The power receiving unit 21 of the electronic device 20 supplies an AC voltage of frequency f2 induced in the coil 21C to the charging circuit 22 and the characteristic detection circuit 27 via the first connection terminal T1 and the second connection terminal T2. The characteristic detection circuit 27 detects that the frequency of the supplied voltage is f2, and sets the detection signal to a low level. This causes the reset circuit 28 to output a reset signal to the reset terminal /Reset of the control unit 25.

(Embodiment 6)
The present invention has been described taking as an example a case where the control unit 25 is reset. However, the process executed by the control unit 25 by switching the characteristics of the supplied power is not limited to the reset process, and any process can be assigned.

For example, as shown in FIG. 8, instead of supplying the output of the power reset circuit (in this case, an interrupt circuit) 290 to the reset terminal of the control unit 25, it may be supplied to an interrupt terminal INT of the control unit 25, and when the characteristic detection circuit 27 detects a specific characteristic, the control unit 25 may execute hardware interrupt processing. It is up to the control unit 25 to decide what kind of processing to assign to the hardware interrupt processing.

For example, if a reset process is assigned to the hardware interrupt process, the same results as the above process can be obtained. However, this is not limited to this, and any process such as displaying a specific message on the touch panel 26, turning off the display, or erasing specific stored data may be assigned to the hardware interrupt. Furthermore, it is also possible to assign a process such as making an emergency call to the outside via a communication line (not shown) or generating an alarm sound from a speaker (not shown) to the hardware interrupt.

In addition, it is also possible to link the processes of the electronic device 20, such as reset, sleep, restart, power off, and backlight off, with the characteristics of the power received by the power receiving unit 21, such as polarity, magnitude, distinction between DC and AC, and frequency, in other words, to change the characteristics of the output power in response to the received instruction, making it possible to selectively execute any process.

For example, the characteristic detection circuit 27 may be configured with a processor and may store a table such as that shown in FIG. 9. When the characteristic detection circuit 27 detects a combination of characteristics registered in this table, it may transmit a command to the control unit 25 to execute a corresponding process.

In the example of the control table in FIG. 9, for example, when the frequency of the received power is f1 and the waveform is a sine wave, the characteristic detection circuit 27 transmits a command to the control unit 25 to execute processing. The control unit 25 executes the processing in response to the command.

(Seventh embodiment)
In the above embodiment, an example has been described in which the reset circuit 28 supplies a reset signal to the reset terminal of the control unit 25 when the characteristic detection circuit 27 detects a predetermined characteristic of the power. The present invention is not limited to this, and the configuration itself is arbitrary as long as it can reset the control unit 25. For example, the same results as described above can be obtained even if the output of the power reset circuit 290 is configured to be supplied to the reset terminal of the power supply IC that constitutes the power supply circuit 24.

In this case, when the characteristic detection circuit 27 detects a predetermined characteristic of the power, the power reset circuit 290 outputs a constant-width low-level pulse to the reset terminal of the power circuit 24. In response to the reset signal, the power circuit 24 temporarily stops outputting the power supply voltage Vdd, and then resumes outputting the power supply voltage Vdd. This causes the power-on reset circuit 280 to supply a reset signal to the reset terminal of the control unit 25, and the reset process is executed.

In addition, for example, a switch may be disposed between the output end of the power supply circuit 24 and the power supply terminal of the control unit 25, and the control unit 25 may be reset by turning this switch on and off. For example, the switch may be a semiconductor switch, and the power supply to the control unit 25 may be cut off by turning this switch off using the power reset circuit 290.

The above describes an embodiment of the present invention, but the configuration and operation are illustrative and not limiting. In the description of the embodiment of the present invention, the circuit configuration is merely an example, and any circuit may be used as long as it can achieve the same function. In addition, the positive and negative logic can be changed as appropriate.

The electronic device 20 shown in this example does not have physical buttons, but it may have buttons. The touch panel 26 is shown as an example of an input/output unit, but the input device and the display device may be configured separately. For example, the power reset circuit is shown as an example, but this is not limiting.

The present invention allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the above-described embodiments are intended to explain the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is indicated by the claims, not by the embodiments. Furthermore, various modifications made within the scope of the claims and within the scope of the meaning of the invention equivalent thereto are considered to be within the scope of the present invention. The inventions described in the original claims of this application are appended below.

(Additional Note)
(Appendix 1)
A power receiving means for receiving power from an external source;
A characteristic detection means for detecting a characteristic of the received power;
A control unit that controls the device itself;
a processing execution means for performing a processing to charge the device when the characteristic detected by the characteristic detection means is a first characteristic, and performing a processing to reset the control unit when the characteristic detected by the characteristic detection means is a second characteristic;
An electronic device comprising:

(Appendix 2)
the characteristic detection means includes means for outputting a signal indicating that the detected characteristic matches the first characteristic or the second characteristic that is preset;
The processing execution means executes a preset processing in response to the signal.
2. The electronic device of claim 1.

(Appendix 3)
an input device for supplying an input signal to the processing execution means;
a display unit that displays an image under the control of the processing execution means;
Further equipped with
The processing execution means processes the input signal from the input device and controls the display unit.
3. The electronic device according to claim 1 or 2.

(Appendix 4)
The characteristic detection means detects a voltage, a polarity, a frequency, or a waveform of the received power as the characteristic of the received power.
4. An electronic device according to any one of claims 1 to 3.

(Appendix 5)
the power receiving means includes a first connection terminal and a second connection terminal for receiving the power by being connected to an external device;
a charging means for charging a secondary battery that supplies power for operating the processing execution means with a first voltage value received at the first connection terminal and a second voltage value received at the second connection terminal;
the process execution means, in response to a detection result of the characteristic detection means, performs a process of supplying a reset signal to the control unit when the voltage of the first connection terminal is the second voltage value and the voltage of the second connection terminal is the first voltage value, which is the second characteristic.
Characterized in that
5. An electronic device according to any one of claims 1 to 4.

(Appendix 6)
a power receiving terminal that receives power by being connected to an external device;
a charging control unit that controls charging using the power supplied to the power receiving terminal;
A control unit that controls the device itself;
Equipped with
The charging control unit is
When the external device and the power receiving terminal are connected in a first direction, charging is performed;
When the connection is made in a second direction different from the first direction, a reset of the control unit is executed.
Electronics.

(Appendix 7)
power output means for generating and outputting electric power having predetermined characteristics;
A means of receiving instructions; and
A means for varying a characteristic of the output power;
having
The power output means changes a characteristic of the output power in response to the received instruction.
Power supply equipment.

(Appendix 8)
An electronic device comprising: an electronic device according to any one of claims 1 to 6; and a power supply device according to claim 7;
Electronic equipment systems.

(Appendix 9)
the power receiving means of the electronic device has a first connection terminal and a second connection terminal as a pair of power receiving terminals,
the power supply device is connected to the pair of power receiving terminals of the power receiving means of the electronic device, and has a third connection terminal and a fourth connection terminal for supplying the power;
a limiting member that limits connection between the first connection terminal and the third connection terminal, and the second connection terminal and the fourth connection terminal, and that is removable and physically limits the interconnection of the terminals;
the first to fourth connection terminals are configured such that, when the restricting member is removed, the first connection terminal and the fourth connection terminal, and the second connection terminal and the third connection terminal, can be connected to each other;
9. The electronic device system according to claim 8.

10...power adapter, 11...power adapter body, 12...commercial power supply, 13...plug, 13A...projection, 13B...projection, 14...operation button, 20...electronic device, 21...power receiving unit, 21C...coil, 21a...receptacle, 21aA...recess, 21aB...recess, 22...charging circuit, 23...secondary battery, 24...power supply circuit, 25...control unit, 26...touch panel, 27...characteristic detection circuit, 28...reset circuit, 251...CPU, 252...RAM, 253...ROM , 254...Interface circuit, 280...Power-on reset circuit, 282...AND circuit, 290...Power reset circuit, 291...Delay circuit, 292...Pull-up resistor, 293...Pull-up resistor, 294...EXOR circuit, 295...Inverter, T+...Positive connection terminal, T-...Negative connection terminal, T1...First connection terminal, T2...Second connection terminal, V1...Voltage, V2...Voltage, Vb...Output voltage, Vcc...Charging voltage, Vdd...Power supply voltage, f1...Frequency, f2...Frequency

Claims (5)

an electronic device including: a power receiving means for receiving power from an external source and having a first connection terminal and a second connection terminal as a pair of power receiving terminals ; a characteristic detection means for detecting a characteristic of the received power ; a control unit for controlling the device itself ; and a process execution means for performing a process of charging the device itself when the characteristic detected by the characteristic detection means is a first characteristic, and performing a process of resetting the control unit when the characteristic detected by the characteristic detection means is a second characteristic ;
a power supply device including: a plug having a third connection terminal and a fourth connection terminal connected to the pair of power receiving terminals and supplying the power; power output means capable of generating and outputting power having predetermined characteristics and changing characteristics of the output power in response to a received instruction; instruction receiving means; and a restriction member that restricts connection so that only the first connection terminal and the third connection terminal, and the second connection terminal and the fourth connection terminal are connected, and that is removable and physically restricts interconnection of the terminals;
When the restricting member is removed, the first connection terminal and the fourth connection terminal, and the second connection terminal and the third connection terminal are allowed to be connected to each other.
Electronic equipment systems . the characteristic detection means includes means for outputting a signal indicating that the detected characteristic matches the first characteristic or the second characteristic that is preset;
The processing execution means executes a preset processing in response to the signal.
The electronic device system according to claim 1 . The electronic device further includes an input device that supplies an input signal to the processing execution means , and a display unit that displays an image under the control of the processing execution means ,
The processing execution means processes the input signal from the input device and controls the display unit.
The electronic device system according to claim 1 . The characteristic detection means detects a voltage, a polarity, a frequency, or a waveform of the received power as the characteristic of the received power.
The electronic device system according to claim 1 . the electronic device further includes a charging means for charging a secondary battery that supplies operating power to the process execution means with a first voltage value received at the first connection terminal and a second voltage value received at the second connection terminal;
the process execution means, in response to a detection result of the characteristic detection means, performs a process of supplying a reset signal to the control unit when the voltage of the first connection terminal is the second voltage value and the voltage of the second connection terminal is the first voltage value, which is the second characteristic .
The electronic device system according to claim 1 .