JP2018092335A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus that does not supply electric power when a foreign material gets inside its outer shell member.SOLUTION: An electronic apparatus includes a tubular outer shell member which can be fitted with a connector of an external device, a terminal member which is placed inside the outer shell member and to which a voltage is applied to detect the external device, a comparator for comparing the voltage applied to the terminal member with a reference voltage, an output unit for outputting a signal to the outer shell member according to a comparison result of the comparator, and a control unit for prohibiting the supply of electric power to the external device when the signal is detected from the outer shell member.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an electronic device.

  In recent years, the type of Universal Serial Bus (USB) interface connector of smartphones and tablets has been changed from a micro USB connector to a USB Type-C connector.

  Conventionally, a device equipped with a USB Type-C connector detects a voltage fluctuation at the Configuration Channel (CC) terminal to detect a power supply device such as a charger or a power-supplied device such as a USB memory or a mouse (hereinafter referred to as a USB device). )) Is detected.

  In addition, a technique for detecting whether or not a connection state detection device is connected to another device by monitoring the presence or absence of formation of a closed circuit is known (for example, see Patent Document 1).

JP 2007-219891 JP2013-140078

  When a foreign object (for example, water, dust, dust, etc.) adheres to the inside of the USB Type-C connector and the CC terminal and other terminals become conductive, the voltage level of the CC terminal may fluctuate. As a result, even though the USB device is not connected, the smartphone or tablet may erroneously detect that the USB device is connected.

  When erroneously detected, power supply is started to a USB device that is not connected from a smartphone or tablet even though the USB device is not connected. At this time, unnecessary power consumption occurs in the smartphone or tablet, and unnecessary power is generated when power is supplied to the foreign object.

  An object of this invention is not to supply electric power when a foreign substance enters the inside of the outer shell member.

  The electronic device according to the embodiment includes a cylindrical outer shell member, a terminal member, a comparison unit, an output unit, and a control unit.

The outer shell member can be fitted with a connector of an external device.
The terminal member is disposed inside the outer shell member, and a voltage is applied to detect the external device.

The comparison unit compares a voltage applied to the terminal member with a reference voltage.
The output unit outputs a signal to the outer shell member according to the comparison result of the comparison unit.

  The control unit prohibits the supply of power to the external device when the signal is detected from the outer shell member.

  According to the electronic apparatus according to the embodiment, power can be prevented from being supplied when a foreign substance is mixed inside the outer shell member.

It is a figure explaining the connection of an electronic device and a USB device. It is an external view of the receptacle of a USB Type-C connector. It is an external view of the plug of a USB Type-C connector. It is a figure which shows arrangement | positioning of the terminal of the receptacle of a USB Type-C connector. It is a block diagram at the time of the connection of the electronic device of a comparative example, and an electric power feeding device. It is a block diagram at the time of the connection of the electronic device of a comparative example, and a USB device. It is a figure at the time of CC terminal and GND terminal short-circuiting at the time of foreign material mixing. It is a block diagram of the electronic device which concerns on embodiment. It is a block diagram at the time of connection of the electronic device and USB device which concern on embodiment. It is a flowchart of the control processing which concerns on embodiment. It is a timing chart at the time of connection of a USB device. It is a timing chart at the time of the foreign material mixing in a receptacle. It is a hardware block diagram of the electronic device which concerns on embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
FIG. 1 is a diagram illustrating connection between an electronic device and a USB device.

  The electronic device 100 includes a receptacle 101 of a USB Type-C connector. The electronic device 100 is, for example, a smartphone, a tablet, or a personal computer (PC).

  The USB device 200 includes a USB Type-C connector plug 201. The USB device 200 is, for example, a mouse, a keyboard, or a USB memory. The USB device 200 is an example of an external device.

  When the electronic device 100 and the USB device 200 are connected, the plug 201 is inserted into the receptacle 101 so that the terminal of the plug 201 and the terminal of the receptacle 101 are connected, and data transmission / reception between the electronic device 100 and the USB device 200 is performed. Electric power can be supplied.

FIG. 2 is an external view of a receptacle of a USB Type-C connector.
The receptacle 101 includes a terminal group 111 and a shell 121. The receptacle 101 is provided in the electronic device 100, for example. The receptacle 101 is connected to a plug 201 of a USB Type-C connector.

  The terminal group 111 includes a plurality of terminals, is connected to a terminal group of a plug of a USB Type-C connector, and is used for power supply and reception, data transmission / reception, and detection of connection of a device such as a USB device. The terminal group 111 is disposed inside the shell 121.

  The shell 121 has a cylindrical shape and surrounds the terminal group 111. The shell 121 is attached to a substrate 131 of an electronic device on which the receptacle 101 is mounted. The shell 121 can be fitted to the shell of the plug 201 of the USB Type-C connector. The shell 121 is made of a conductive member such as metal, for example. The shell 121 is an example of an outer shell member.

FIG. 3 is an external view of a USB Type-C connector plug.
The USB device 200 includes a plug 201, a housing 231, a cable 241, and a main body 251.

  The plug 201 includes a terminal group 211 and a shell 221. The plug 201 is provided in the USB device 200 such as a mouse or a keyboard, for example. Further, the plug 201 may be included in a power feeding device such as a charger. Plug 201 is connected to receptacle 101 of the USB Type-C connector. Further, the plug 201 can be connected to the receptacle 101 even when the vertical direction is reversed.

  The terminal group 211 includes a plurality of terminals, is connected to the terminal group 111 of the receptacle 101 of the USB Type-C connector, and is used for transmission and reception of power and data. The terminal group 211 is disposed inside the shell 221. The terminal group 211 includes a VBUS terminal used for power supply or reception, a CC terminal connected to the CC1 terminal or the CC2 terminal of the receptacle 101, a GND terminal connected to the ground, and the like.

  The shell 221 has a cylindrical shape and surrounds the terminal group 211. The shell 221 can be fitted to the shell 121 of the receptacle 101 of the USB Type-C connector.

  The plug 201 is connected to the cable 241 via the housing 231, and the cable 241 is connected to the main body 251 of the USB device 200. The plug 201 may be attached to the main body 251 of the USB device 200 without using the cable 241 or the like.

  In other drawings and descriptions, the housing 231 and the cable 251 are not shown.

FIG. 4 is a diagram showing an arrangement of terminals of the receptacle of the USB Type-C connector.
The terminal group 111 of the receptacle 101 includes 24 terminals (pins) A1 to A12 and B1 to B12. The terminals A1 to A12 are arranged so as to face the terminals B12 to B1 with an insulator interposed therebetween. Hereinafter, the roles or signals of the terminals A1 to A12 and B1 to B12 will be described.

The terminal A1 (GND) is a ground terminal connected to the ground (GND).
The terminal A2 (TX1 +) is a signal terminal for USB 3.1 transmission data.
The terminal A3 (TX1-) is a signal terminal for USB 3.1 transmission data.
The terminal A4 (VBUS) is a power supply terminal used to supply power to the connected USB device or supply power from the power supply device.
The terminal A5 (CC1) is a terminal for detecting a device connected to the electronic device 100.
The terminal A6 (D +) is a USB 2.0 signal terminal.
The terminal A7 (D−) is a USB 2.0 signal terminal.
The terminal A8 (SBU1) is a function expansion terminal.
The terminal A9 (VBUS) is a power supply terminal used to supply power to the connected USB device or to supply power from the power feeding device.
The terminal A10 (RX2-) is a signal terminal for USB 3.1 reception data.
The terminal A11 (RX2 +) is a signal terminal for USB 3.1 received data.
The terminal A12 (GND) is a ground terminal connected to the ground (GND).

The terminal B1 (GND) is a ground terminal connected to the ground (GND).
The terminal B2 (TX2 +) is a signal terminal for USB 3.1 transmission data.
The terminal B3 (TX2-) is a signal terminal for USB 3.1 transmission data.
The terminal B4 (VBUS) is a power supply terminal used to supply power to the connected USB device or supply power from the power feeding device.
The terminal B5 (CC2) is a terminal for detecting a device connected to the electronic device 100.
The terminal B6 (D +) is a USB 2.0 signal terminal.
The terminal B7 (D−) is a USB 2.0 signal terminal.
The terminal B8 (SBU2) is a function expansion terminal.
The terminal B9 (VBUS) is a power supply terminal used to supply power to the connected USB device or supply power from the power feeding device.
The terminal B10 (RX1-) is a signal terminal for USB 3.1 received data.
A terminal B11 (RX1 +) is a signal terminal for USB 3.1 received data.
The terminal B12 (GND) is a ground terminal connected to the ground (GND).

  Hereinafter, the terminal A4, the terminal A9, the terminal B4, and the terminal B9 may be referred to as VBUS terminals. Terminal A5 may be referred to as a CC1 terminal. Terminal B5 may be referred to as a CC2 terminal. The CC1 terminal and the CC2 terminal may be referred to as CC terminals. The terminal A1, the terminal A12, the terminal B1, and the terminal B12 may be referred to as GND terminals.

  Prior to description of detection of USB device connection by the electronic apparatus according to the embodiment, detection and problems of the apparatus by the electronic apparatus of the comparative example will be described.

FIG. 5 is a configuration diagram when the electronic device of the comparative example and the power feeding device are connected.
The electronic device 100 ′ includes a receptacle 101, a battery 131, a power supply management unit 141, a power reception management unit 142, a switch 143, a determination unit 151 ′, comparators 161 and 162, pull-up resistors Rp1 and Rp2, pull-down resistors Rd1 and Rd2, and Switches SW11, SW12, SW21, and SW22 are provided. The electronic device 100 ′ is, for example, a smartphone, a tablet, or a personal computer (PC).

  The power feeding device 300 includes a plug 201, a DC voltage output unit 311, and a pull-up resistor Rp3.

  In FIG. 5, when the electronic device 100 ′ and the power feeding device 300 are connected, the shell 121 and the shell 221 are actually fitted, but the receptacle 101 and the plug 201 are separated from each other for easy viewing. It is described. The same applies to other figures.

  In FIG. 5, the terminal of the receptacle 101 and the terminal of the plug 201 are connected by a line, which indicates that the two terminals are connected, and the shell 121 and the shell 221 are connected by a line. This shows that the shell 121 and the shell 221 are fitted. The same applies to other figures.

  5, the VBUS terminal, the CC1 terminal, the CC2 terminal, and the GND terminal are shown in the terminal group 111 included in the receptacle 101, and other terminals are omitted. In addition, among the terminal group 211 included in the plug 201, the VBUS terminal, the CC terminal, and the GND terminal are described, and the other terminals are omitted. The same applies to other figures.

  The receptacle 101 can be connected to the plug 201 of the power feeding device 300. When the electronic apparatus 100 and the power feeding device 300 are connected, the shell 121 of the receptacle 101 and the shell 221 of the plug 201 are fitted. The shell 221 is connected to the ground.

  The VBUS terminal of the receptacle 101 is connected to either the power supply management unit 141 or the power reception management unit 142 via the switch 143.

  The power supply management unit 141 is connected to the battery 131 and supplies power to the USB device 200 from the VBUS terminal when the USB device 200 is connected.

  The power reception management unit 142 is connected to the battery 131, receives power from the VBUS terminal when the power feeding device 300 is connected, and charges the battery 131.

  The CC1 terminal is connected to the comparator 161, connected to the pull-up resistor Rp1 via the switch SW11, and connected to the pull-down resistor Rd1 via the switch SW12.

  The CC2 terminal is connected to the comparator 162, connected to the pull-up resistor Rp2 via the switch SW21, and connected to the pull-down resistor Rd2 via the switch SW22.

  The pull-up resistors Rp1, Rp2 are connected to the power supply line, and the pull-down resistors Rd1, Rd2 are connected to the ground.

  The switches SW11 and SW12 are alternately turned on and off at predetermined time intervals, and either one is connected to the CC1 terminal. Accordingly, when the switch SW11 is on (switch SW12 is off), the CC1 terminal is pulled up (voltage is applied), and when the switch SW12 is on (switch SW11 is off), the CC1 terminal is pulled down.

  The switches SW21 and SW22 are alternately turned on and off at predetermined time intervals, and one of them is connected to the CC2 terminal. Accordingly, when the switch SW21 is on (switch SW22 is off), the CC2 terminal is pulled up (voltage is applied), and when the switch SW22 is on (switch SW21 is off), the CC2 terminal is pulled down.

  Further, the switch SW11 and the switch SW21, and the switch SW21 and the switch SW22 are switched at the same timing. Therefore, the CC1 terminal and the CC2 terminal are in the same state (pull-up or pull-down). If the USB device 200 is not connected when the CC1 terminal and the CC2 terminal are pulled up, the outputs of the CC1 terminal and the CC2 terminal are at the H level.

  The comparator 161 receives the output of the CC1 terminal and the comparison voltage (reference voltage), outputs an L level signal if the level of the input signal (voltage) is the same, and outputs an H level signal if they are different.

  The comparator 162 receives the output of the CC2 terminal and the comparison voltage (reference voltage), outputs an L level signal if the level of the input signal (voltage) is the same, and outputs an H level signal if the input signal (voltage) is different.

  The comparison voltage input to the comparators 161 and 161 is at the H level when the CC1 terminal and the CC2 terminal are pulled up, and at the L level when the CC1 terminal is pulled down.

  The determination unit 151 determines whether the power supply device is connected or the USB device is connected based on the outputs of the comparators 161 and 161 and the state of the CC1 terminal and the CC2 terminal (pull-up or pull-down). Determine whether to receive power.

  FIG. 5 shows a state when the electronic device 100 is connected to the power feeding device 300 and the CC1 terminal and the CC2 terminal are pulled down. Further, it is assumed that the CC terminal of the power feeding device 300 is connected to the CC1 terminal of the receptacle 101.

  The VBUS terminal of the power feeding device 300 is connected to the VBUS terminal of the receptacle 101 and outputs power from the DC voltage output unit 311.

  The CC terminal of the power feeding device 300 is connected to the power supply line via the pull-up resistor Rp3, and when connected to the CC1 terminal, the output of the CC1 terminal becomes H level. Since the comparison voltage is L level and the output of the CC1 terminal is H level, the comparator 161 outputs a signal of H level.

  The determination unit 151 ′ detects that the output of the comparator 161 fluctuates (becomes H level) when the CC1 terminal is pulled down, determines that the power feeding device 300 is connected, and determines that power reception is performed. To do.

  The determination unit 151 ′ instructs the power reception management unit 142 to receive power, and the power reception management unit 142 switches the switch 143 to connect to the VBUS terminal and receives power from the VBUS terminal. Thereby, the battery 131 is charged.

FIG. 6 is a configuration diagram when the electronic device of the comparative example is connected to the USB device.
FIG. 6 shows a state when the electronic device 100 ′ is connected to the USB device 200 and the CC1 terminal and the CC2 terminal are pulled up. Further, it is assumed that the CC terminal of the USB device 200 is connected to the CC1 terminal of the receptacle 101.

  The CC terminal of the USB device 200 is connected to the ground via the pull-down resistor Rd3, and when connected to the CC1 terminal, the output of the CC1 terminal becomes L level. Since the comparison voltage is H level and the output of the CC1 terminal is L level, the comparator 161 outputs a signal of H level.

  The determination unit 151 ′ detects that the output of the comparator 161 fluctuates (becomes H level) when the CC1 terminal is pulled up, determines that the USB device is connected, and determines that power supply is performed. To do.

  The determination unit 151 ′ instructs the power supply management unit 141 to supply power, and the power supply management unit 141 switches the switch 143 to connect to the VBUS terminal and outputs power from the VBUS terminal. As a result, power is supplied to the USB device 200.

FIG. 7 is a diagram when the CC terminal and the GND terminal are short-circuited due to foreign matter mixing.
FIG. 7 shows a state when the CC1 terminal and the CC2 terminal are pulled up.

  Before the foreign substance 301 is mixed, when the CC2 terminal is pulled up, the comparison voltage is at the H level and the output at the CC2 terminal is also at the H level, so the comparator 162 outputs an L level signal.

  When the CC2 terminal and the GND terminal are short-circuited due to the contamination of the foreign substance 301, the output of the CC2 terminal becomes L level. The comparator 161 outputs a signal of H level because the comparison voltage is H level and the output of the CC2 terminal is L level and different.

  The determination unit 151 ′ detects that the output of the comparator 161 fluctuates (becomes H level) when the CC2 terminal is pulled up, determines that the USB device is connected, and determines that power supply is performed. To do.

  The determination unit 151 instructs the power supply management unit 141 to supply power, and the power supply management unit 141 switches the switch 143 to connect to the VBUS terminal and outputs power from the VBUS terminal.

  As described above, the electronic device according to the comparative example has a problem in that the connection of the USB device is erroneously detected and the power is supplied due to the contamination of the foreign matter, thereby causing wasteful power consumption and wasteful heat generation.

FIG. 8 is a configuration diagram of the electronic device according to the embodiment.
The electronic device 100 includes a receptacle 101, a battery 131, a power supply management unit 141, a power reception management unit 142, a switch 143, a determination unit 151, comparators 161 and 162, pull-up resistors Rp1, Rp2, pull-down resistors Rd1, Rd2, a switch SW11, SW12, SW21, SW22, a signal pattern application unit 171, a signal pattern determination unit 181 and a resistor R are provided. The electronic device 100 is, for example, a smartphone, a tablet, or a personal computer (PC).

  The receptacle 101 can be connected to the plug 201 of the USB device 200. When the electronic device 100 and the USB device 200 are connected, the shell 121 of the receptacle 101 and the shell 221 of the plug 201 are fitted. In FIG. 8, the VBUS terminal, the CC1 terminal, the CC2 terminal, and the GND terminal in the terminal group 111 included in the receptacle 101 are illustrated, and other terminals are omitted. The same applies to other figures.

  The VBUS terminal of the receptacle 101 is connected to either the power supply management unit 141 or the power reception management unit 142 via the switch 143.

  The power supply management unit 141 is connected to the battery 131 and supplies power to the USB device 200 from the VBUS terminal when the USB device 200 is connected.

  The power reception management unit 142 is connected to the battery 131, receives power from the VBUS terminal when the power feeding device is connected, and charges the battery 131.

  The CC1 terminal is connected to the comparator 161, connected to the pull-up resistor Rp1 via the switch SW11, and connected to the pull-down resistor Rd1 via the switch SW12.

  The CC2 terminal is connected to the comparator 162, connected to the pull-up resistor Rp2 via the switch SW21, and connected to the pull-down resistor Rd2 via the switch SW22.

  The pull-up resistors Rp1, Rp2 are connected to the power supply line, and the pull-down resistors Rd1, Rd2 are connected to the ground.

  The switches SW11 and SW12 are alternately turned on and off at predetermined time intervals, and either one is connected to the CC1 terminal. Accordingly, when the switch SW11 is on (switch SW12 is off), the CC1 terminal is pulled up (voltage is applied), and when the switch SW12 is on (switch SW11 is off), the CC1 terminal is pulled down.

  The switches SW21 and SW22 are alternately turned on and off at predetermined time intervals, and one of them is connected to the CC2 terminal. Accordingly, when the switch SW21 is on (switch SW22 is off), the CC2 terminal is pulled up (voltage is applied), and when the switch SW22 is on (switch SW21 is off), the CC2 terminal is pulled down.

  Further, the switch SW11 and the switch SW21, and the switch SW21 and the switch SW22 are switched at the same timing. Therefore, the CC1 terminal and the CC2 terminal are in the same state (pull-up or pull-down). If the USB device 200 is not connected when the CC1 terminal and the CC2 terminal are pulled up, the outputs of the CC1 terminal and the CC2 terminal are at the H level. Further, when the CC1 terminal and the CC2 terminal are pulled down, if the power feeding device 300 is not connected, the outputs of the CC1 terminal and the CC2 terminal are L level.

  The comparator 161 receives the output of the CC1 terminal and the comparison voltage (reference voltage), outputs an L level signal if the level of the input signal (voltage) is the same, and outputs an H level signal if they are different.

  The comparator 162 receives the output of the CC2 terminal and the comparison voltage (reference voltage), outputs an L level signal if the level of the input signal (voltage) is the same, and outputs an H level signal if the input signal (voltage) is different.

  The comparison voltage input to the comparators 161 and 161 is at the H level when the CC1 terminal and the CC2 terminal are pulled up, and at the L level when the CC1 terminal is pulled down.

  The determination unit 151 'determines whether the power feeding device is connected or the USB device is connected based on the outputs of the comparators 161 and 161 and the states of the CC1 terminal and the CC2 terminal (pull-up or pull-down).

  The signal pattern application unit 171 is connected to the shell 121 via the resistor R, and outputs a signal having a predetermined pattern based on the determination result of the determination unit 151. The signal pattern application unit 171 is an example of an output unit.

  The signal pattern determination unit 181 is connected to the shell 121, receives a signal input (applied) to the shell 121 from the shell 121, determines whether the USB device 200 is connected based on the received signal, and performs power supply. To determine. The signal pattern determination unit 181 is an example of a control unit.

FIG. 9 is a configuration diagram when the electronic device and the USB device according to the embodiment are connected.
FIG. 9 shows a state when the electronic device 100 is connected to the USB device 200 and the CC1 terminal and the CC2 terminal are pulled up. Further, it is assumed that the CC terminal of the plug 201 of the USB device 200 is connected to the CC1 terminal of the receptacle 101. Further, the shell 221 of the plug 201 and the shell 121 of the receptacle 101 are fitted.

  The CC terminal of the USB device 200 is connected to the ground via the pull-down resistor Rd3, and when connected to the CC1 terminal, the output of the CC1 terminal becomes L level. Since the comparison voltage is H level and the output of the CC1 terminal is L level, the comparator 161 outputs a signal of H level.

  The determination unit 151 detects that the output of the comparator 161 fluctuates (becomes H level) when the CC1 terminal is pulled up, and instructs the signal pattern application unit 171 to output a signal of a predetermined pattern. To do.

  When receiving the instruction, the signal pattern application unit 171 outputs a signal having a predetermined pattern. The shell 221 of the plug 201 of the USB device 200 is connected to the ground. When the shell 221 of the plug 201 and the shell 121 of the receptacle 101 are fitted, the shell 121 is also connected to the ground and is detected from the shell 121. The signal is always at L level.

  The signal pattern determination unit 181 receives and monitors the signal of the shell 121, and when the signal pattern application unit 171 outputs a signal of a predetermined pattern, the signal is not detected, so the USB device 200 is connected. It is determined that power is supplied. The signal pattern determination unit 181 outputs a power supply instruction to the power supply management unit 141.

FIG. 10 is a flowchart of the control process according to the embodiment.
In step S501, the determination unit 151 monitors the outputs of the comparator 161 and the comparator 162. If any of the outputs of the comparator 161 and the comparator 162 changes, the control proceeds to step S502.

  In step S502, when the output of the comparator 161 or the comparator 162 fluctuates, the determination unit 151 determines whether the CC1 terminal and the CC2 terminal are pulled up (that is, the CC1 terminal and the CC2 terminal are the pull-up resistors Rp1 and Rp2 respectively. Is connected). If the CC1 terminal and the CC2 terminal are pulled up, the control proceeds to step S504, and if not pulled up, the control proceeds to step S503.

  In step S503, the determination unit 151 determines that the power feeding device is connected, and instructs the power reception management unit 142 to receive power. The power reception management unit 142 switches the switch 143 to connect to the VBUS terminal, receives power from the VBUS terminal, and charges the battery 131.

  In step S504, the determination unit 151 determines that the USB device 200 may be connected, and instructs the signal pattern application unit 171 to output a signal. When the signal pattern application unit 171 receives an instruction from the determination unit 151, the signal pattern application unit 171 outputs a signal having a predetermined pattern. That is, the signal pattern application unit 171 applies a predetermined pattern signal to the shell 121. Note that if the signal pattern application unit 171 always applies a signal to the shell 121, the shell 121 itself is likely to be deteriorated or a short circuit due to a foreign object is likely to occur. Therefore, as described above, the USB device 200 may be connected. A signal is applied to the shell 121 only when it is determined (that is, when the output of either the comparator 161 or the comparator 162 fluctuates and the CC terminal is pulled up). This reduces the possibility of the deterioration of the shell 121 itself and the occurrence of a short circuit due to foreign matter.

  In step S505, the signal pattern determination unit 181 monitors input from the shell 121, and determines whether a predetermined pattern signal output from the signal pattern application unit 171 has been received. If a signal with a predetermined pattern is received, control proceeds to step S506, and if a signal with a predetermined pattern is not received (that is, if the input signal is always at L level), control proceeds to step S507.

  In step S506, the signal pattern determination unit 181 determines that a short circuit has occurred due to a foreign object, and determines that power feeding is not performed. That is, the signal pattern determination unit 181 prohibits power supply from the VBUS terminal.

  In step S507, the signal pattern determination unit 181 determines that the USB device 200 is connected, and determines that power is supplied to the USB device 200.

  In step S508, the signal pattern determination unit 181 supplies power to the connected USB device 200. Specifically, the signal pattern determination unit 181 instructs the power supply management unit 141 to supply power, and the power supply management unit 141 switches the switch 143 to connect to the VBUS terminal and outputs power from the VBUS terminal.

FIG. 11 is a timing chart when the USB device is connected.
FIG. 11 shows, in order from the top, the voltage of the VBUS terminal, the comparison voltage, the CC terminal voltage, the comparator output signal, the output of the signal pattern application unit, and the input of the signal pattern determination unit.

  The voltage of the VBUS terminal is the voltage of the VBUS terminal (A4 terminal, A9 terminal, B4 terminal, B9 terminal) of the receptacle 101.

The comparison voltage is a voltage input to the comparators 161 and 162.
The CC terminal voltage is a voltage of a terminal to which the CC terminal of the plug 201 is connected among the CC1 terminal (A5 terminal) and the CC2 terminal (B5 terminal) of the receptacle 101. Hereinafter, of the CC1 terminal and the CC2 terminal, the terminal of the receptacle 101 to which the CC terminal of the plug 201 is connected is referred to as a CC terminal.

  The comparator output signal is an output signal of a comparator connected to the CC terminal of the receptacle 101 among the comparator 161 and the comparator 162.

  It is assumed that the USB device 100 is connected to the electronic device 100 and the CC terminal of the receptacle 101 and the CC terminal of the plug 201 are connected at time t1 when the comparison voltage is at the H level. As described above, the CC terminal of the plug 201 of the USB device 100 is connected to GND. As a result, the voltage at the CC terminal of the receptacle 101 becomes L level, and the comparison voltage and the voltage at the CC terminal are different, so the output signal of the comparator becomes H level.

  When the output signal of the comparator 161 or the comparator 162 becomes H level, the signal pattern application unit 171 outputs (applies) a signal having a predetermined pattern to the shell 121.

  As described above, since the shell 221 of the plug 201 of the USB device 100 is connected to the GND, the shell 121 of the receptacle 101 is also connected to the GND when the electronic device 100 and the USB device 100 are connected. Thereby, the signal (voltage) detected from the shell 121 of the receptacle 101 is always L level.

  The signal pattern determination unit 181 receives and monitors the signal (voltage) from the shell 121, and when the signal pattern application unit outputs a signal having a predetermined pattern and the signal is not detected from the shell 121, at time t2. Then, it is determined that the USB device is connected, it is determined that power is to be supplied, and the power supply management unit is instructed to supply power. As a result, the voltage at the VBUS terminal becomes H level, and power is supplied to the connected USB device 200.

FIG. 12 is a timing chart when foreign matter is mixed into the receptacle.
FIG. 12 shows the VBUS terminal voltage, the comparison voltage, the CC terminal voltage, the comparator output signal, the output of the signal pattern application unit 171 and the input of the signal pattern determination unit 181 in order from the top. Since these voltages or signals are the same as those in FIG. 11, detailed description thereof is omitted.

  At time t1, it is assumed that the CC terminal and the GND terminal are connected due to foreign matter mixed in when the comparison voltage is at the H level. As a result, the voltage at the CC terminal becomes L level and the comparison voltage and the voltage at the CC terminal are different, so that the output signal of the comparator becomes H level.

  When the output signal of the comparator becomes H level, the signal pattern application unit outputs (applies) a signal of a predetermined pattern to the shell 121.

  The signal pattern determination unit 181 monitors the input from the shell 121. When a signal with a predetermined pattern is detected at time t2, the signal pattern determination unit 181 determines that foreign matter is mixed in, determines that power is not supplied, and supplies power. The management unit 141 is not instructed to supply power. As a result, power is not supplied from the VBUS terminal, and the voltage at the VBUS terminal remains at the L level. Therefore, useless power consumption and useless heat generation can be avoided.

FIG. 13 is a hardware configuration diagram of the electronic device according to the embodiment.
Electronic device 100 of the embodiment can be realized by hardware as shown in FIG.

  The electronic device 100 includes a receptacle 101, a battery 130, a power management circuit 140, a CPU 150, a memory 170, a storage 172, a wireless circuit 173, an antenna 174, a sensor 175, an audio circuit 176, a microphone 177, a speaker 178, and a liquid crystal display (LCD). 179 and a touch panel 180. The CPU 150 is connected to the receptacle 101, the power management circuit 140, the memory 170, the storage 172, the wireless circuit 173, the sensor 175, the audio circuit 176, the LCD 179, and the touch panel 180 via a bus.

  The receptacle 101 is a receptacle of a USB Type-C connector and is connected to a plug 201 of a USB Type-C connector provided in an external device such as the USB device 200.

  The battery 130 is a rechargeable secondary battery. The battery 130 is, for example, a lithium ion secondary battery.

  The power management circuit 140 is connected to the battery 131 and controls charging of the battery 131 and power supply to the electronic device 100 and the connected USB device 200. The power management circuit 140 corresponds to the power supply management unit 141, the power reception management unit 142, and the switch 143.

  The CPU 150 is a central processing unit that controls the entire electronic device 100. The CPU 150 includes an external interface (I / F) 152. The external I / F 152 includes a determination unit 151, comparators 161 and 162, a signal pattern application unit 171, a signal pattern determination unit 181, a pull-up resistor Rp1, RP2, a pull-down resistor Rd1, Rd2, a resistor R, and switches SW11, SW12, Corresponds to SW21 and SW22.

  The memory 170 is a read only memory (ROM) or a random access memory (RAM) that temporarily stores a program or data stored in the storage 172 (or a portable recording medium (not shown)) during program execution. And so on. The CPU 150 executes the various processes described above by executing programs using the memory 170. In this case, the program code itself read from the storage 172 or the portable recording medium implements the functions of the embodiment.

  The storage 172 stores data, programs, and the like used by the electronic device 100. The storage 172 is, for example, a nonvolatile memory or a magnetic disk device.

  The wireless circuit 173 performs data conversion accompanying communication, and transmits and receives data by wireless communication using the antenna 174.

  The sensor 175 detects a state of the electronic device 100, a state around the electronic device 100, an input to the electronic device 100, and the like. The sensor 175 is, for example, an acceleration sensor, a geomagnetic sensor, an illuminance sensor, a proximity sensor, a temperature sensor, or a fingerprint sensor.

  The audio circuit 176 is connected to the microphone 177 and the speaker 178, and controls the microphone 177 and the speaker 178.

The microphone 177 converts the input sound into an electric signal.
The speaker 178 outputs sound such as music and voice.

The LCD 179 displays information such as characters and images.
The touch panel 180 detects the contact of a finger, a touch pen, etc., and outputs the coordinates of the position where the finger, the touch pen, etc. are in contact to the CPU 150.

  Note that the electronic device 100 does not have to include all the components illustrated in FIG. 13, and some of the components may be omitted depending on applications and conditions. For example, the wireless circuit 173 and the antenna 174 may be omitted when wireless communication is not performed, and the touch panel 180 may be omitted when touch input is not performed.

  According to the electronic apparatus according to the embodiment, power can be prevented from being supplied when a foreign substance is mixed inside the outer shell member. Specifically, according to the electronic device according to the embodiment, in determining whether the USB device is connected or not, misjudgment due to mixing of foreign matter into the connector is prevented, and power is supplied when the USB device is not connected. You can prevent it from starting. Thereby, wasteful power consumption and wasteful heat generation can be avoided.

  The present invention is not limited to a USB Type-C connector, and is applicable to a connector having a shell, a terminal for detecting connection of an external device, and a terminal for supplying power to the external device. .

Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A cylindrical outer shell member that can be fitted with a connector of an external device;
A terminal member that is disposed inside the outer shell member and to which a voltage is applied to detect the external device;
A comparison unit that compares a voltage applied to the terminal member with a reference voltage;
According to the comparison result of the comparison unit, an output unit that outputs a signal to the outer shell member;
A control unit that prohibits the supply of power to the external device when the signal is detected from the outer shell member;
Electronic equipment comprising.
(Appendix 2)
The electronic apparatus according to claim 1, wherein the control unit supplies power to the external device when the signal is not detected from the outer shell member.
(Appendix 3)
Supplementary note 1 wherein the output unit outputs the signal to the outer shell member when the comparison result indicates that there is a difference between the voltage applied to the terminal member and the reference voltage. Or the electronic device of 2.

DESCRIPTION OF SYMBOLS 100 Electronic device 101 Receptacle 111 Terminal group 121 Shell 131 Battery 141 Power supply management part 142 Power reception management part 151 Judgment part 161,162 Comparator 171 Signal pattern application part 181 Signal pattern judgment part 200 USB device 201 Plug 211 Terminal group 221 Shell

Claims (3)

A cylindrical outer shell member that can be fitted with a connector of an external device;
A terminal member that is disposed inside the outer shell member and to which a voltage is applied to detect the external device;
A comparison unit that compares a voltage applied to the terminal member with a reference voltage;
According to the comparison result of the comparison unit, an output unit that outputs a signal to the outer shell member;
A control unit that prohibits the supply of power to the external device when the signal is detected from the outer shell member;
Electronic equipment comprising.   The electronic device according to claim 1, wherein the control unit supplies power to the external device when the signal is not detected from the outer shell member.   The output unit outputs the signal to the outer shell member when the comparison result indicates that there is a difference between the voltage applied to the terminal member and the reference voltage. The electronic device according to 1 or 2.