Foreign object detection apparatus and method

Abstract

The present invention relates to a foreign matter detection device for detecting a foreign matter on a connector or a device and a method thereof. One aspect of the present invention provides a foreign matter detection device for detecting a foreign matter on a connector including at least one pin or a device, the foreign matter detection device including a current source for supplying a detection current of different magnitudes to a certain pin (first pin) of the connector, a detection circuit for detecting a voltage of the first pin, and a detection control section for controlling a magnitude of the detection current supplied to the first pin and a time point of the supply, and detecting the voltage of the first pin input from the detection circuit based on the control to detect a foreign matter or a device attached to the connector.

Description

Technical Field

[0001] This invention relates to a device and method for detecting foreign objects on connectors or devices. Background Technology

[0002] Some electronic devices communicate with or supply power to external electronic devices via cables connected to connectors. In this case, current flows through the connector, and if foreign objects such as moisture enter the connector, some pins may short-circuit, corrode, or be damaged, potentially leading to excessive power consumption in some cases. Furthermore, when non-rated devices are connected to the connector, the connected non-rated devices may be misidentified and malfunction. Therefore, an effective solution is needed that can not only accurately identify the devices connected to the connector but also detect whether foreign objects have entered the connector. Summary of the Invention

[0003] Technical issues

[0004] One object of the present invention is to provide a foreign object detection device and method according to embodiments, which can detect the presence or type of foreign objects entering a connector, so as to prevent the connector from being corroded or damaged due to foreign objects.

[0005] One object of the present invention is to provide, according to embodiments, a foreign object detection device and method capable of detecting the presence or type of an external device connected to a connector.

[0006] One object of the present invention is to provide, according to embodiments, a foreign object detection device and method capable of confirming the removal status of foreign objects or devices on a connector. Technical solution

[0007] To achieve the above-mentioned technical objectives, one aspect of the present invention provides a foreign object detection device for detecting foreign objects or devices on a connector including at least one pin. The foreign object detection device includes: a current source that provides a detection current of different magnitudes to a pin (first pin) of the connector; a detection circuit that detects the voltage of the first pin; and a detection control unit that controls the magnitude and timing of the detection current provided to the first pin, and detects the voltage of the first pin input from the detection circuit according to the control, so as to detect foreign objects or devices attached to the connector.

[0008] In the foreign object detection device, the pull-down voltage V of the first pin is detected when a pull-down resistor is connected to the first pin. S When the value exceeds the first threshold, the detection control unit determines that a power supply device is connected to the first pin.

[0009] In the foreign object detection device, the first voltage V of the first pin is detected when a first current (I1) is supplied to the first pin. S1 When the value is less than the second threshold, the detection control unit enters the connection status judgment subroutine.

[0010] In the foreign object detection device, in the connection status determination subroutine, the detection control unit sequentially provides a second current I2 and a third current I3 to the first pin through the current source, and detects the second voltage V corresponding to the second current I2 at the first pin through the detection circuit. S2 and the third voltage V corresponding to the third current I3 S3 Based on the ratio of the second current I2 to the third current I3 and the second voltage V S2 With the third voltage V S3 The ratio is used to determine whether the material attached to the first pin is a resistive component. If it is a resistive component, the program enters the rated device determination subroutine to determine whether a rated device is connected. If it is not a resistive component, the program determines that the device connected to the first pin is not a rated device.

[0011] In the foreign object detection device, the detection control unit provides a fourth current I4 to the first pin through the current source, and detects the fourth-1 voltage V of the first pin at a first time point after the fourth current I4 is provided through the detection circuit. S4-1 and the 4-2 voltage V at the first pin at the second time point after providing the fourth current I4. S4-2 Based on the use of the fourth current I4 and the fourth-second voltage V S4-2 The calculated magnitude of the resistive component and the fourth-first voltage V S4-1 and the fourth-2nd voltage V S4-2 The difference is used to determine whether a rated device is connected.

[0012] In the foreign object detection device, if the fourth current I4 and the fourth-second voltage V are used... S4-2 The calculated resistivity component is within the range of the rated resistance of the equipment, from the 4-2 voltage V. S4-2 Subtract the 4-1 voltage V S4-1 If the value is not greater than the fourth threshold, the detection control unit determines that a rated device is connected to the first pin.

[0013] In the foreign object detection device, the detection control unit cuts off the current supplied to the first pin through the current source, and the detection circuit detects the first cutoff voltage V of the first pin at the first cutoff time point. STP-1 and the cutoff second voltage V of the first pin at the second cutoff time pointSTP-2 If the second voltage V is cut off STP-2 If the value is not greater than the fifth threshold, it is determined that there is a foreign object other than moisture attached to the first pin. If the first voltage V is cut off... STP-1 and cut off the second voltage V STP-2 If the difference is greater than the sixth threshold, it is determined that there is moisture attached to the first pin.

[0014] In the foreign object detection device, when it is determined that the device connected to the first pin is not a rated device, the detection control unit sequentially provides a fifth current I5 and a sixth current I6 to the first pin, and detects the fifth voltage V corresponding to the fifth current I5. S5 and the sixth voltage V corresponding to the sixth current I6 S6 Calculate the resistance values ​​of the fifth current I5 and the sixth current I6. If the resistance value of the relatively larger current I5 is smaller than that of the sixth current I6, it is determined that a device in a depleted battery state is connected to the first pin.

[0015] Another aspect of the present invention provides a foreign object detection method, performed by a foreign object detection device for detecting foreign objects on a connector or a device, the foreign object detection method comprising: a first step, detecting a pull-down voltage V of the first pin based on a pull-down resistor connected to a pin (first pin) of the connector. S The first step is to determine whether a power supply device is connected to the connector; the second step is to detect the first voltage V of the first pin based on the first current I1 supplied to the first pin. S1 The process involves determining whether to enter a connection state determination subroutine; and a third step, in which the connection state determination subroutine detects the second voltage V of the first pin based on the second current I2 and the third current I3 sequentially supplied to the first pin. S2 and the third voltage V S3 It determines whether the material attached to the first pin is a resistive component, and decides whether to enter the rated device determination subroutine to determine whether a rated device is connected to the first pin based on whether it is a resistive component.

[0016] In the first step of the foreign object detection method, if the pull-down voltage V S If the voltage V of the first pin is greater than the first threshold, it is determined that the first pin is connected to a power supply device. S If the value is not greater than the first threshold, proceed to the second step.

[0017] In the second step of the foreign object detection method, if the first voltage V of the first pin... S1If the voltage V at the first pin is less than the second threshold, proceed to the third step. S1 If the value is not less than the second threshold, then return to the first step.

[0018] In the third step of the foreign object detection method, when the ratio of the second current I2 to the third current I3 and the second voltage V... S2 With the third voltage V S3 When the difference between the ratios is less than the third threshold, the rated equipment judgment subroutine is entered. This subroutine determines the ratio of the second current I2 to the third current I3 and the second voltage V. S2 With the third voltage V S3 When the difference in the ratio is not less than the third threshold, it is determined whether the device connected to the first pin is in a state of battery depletion.

[0019] In the foreign object detection method, the rated device judgment subroutine further includes a fourth step, in which a fourth current I4 is provided to the first pin, based on the fourth-1 voltage V of the first pin at a first time point after the fourth current I4 is provided. S4-1 and the 4-2 voltage V at the first pin at the second time point after providing the fourth current I4. S4-2 Determine whether a rated device is connected to the first pin.

[0020] In the fourth step of the foreign object detection method, if the fourth current I4 and the fourth-second voltage V are used... S4-2 The calculated resistivity component is within the range of the rated resistance of the equipment, and is derived from the 4-2 voltage V. S4-2 Subtract the 4-1 voltage V S4-1 If the value is not greater than the fourth threshold, it is determined that the first pin is connected to a rated device.

[0021] In the fourth step of the foreign object detection method, if the fourth current I4 and the fourth-second voltage V are used... S4-2 The calculated resistance component is outside the range of the rated resistance of the equipment, or is derived from the voltage V in section 4-2. S4-2 Subtract the 4-1 voltage V S4-1 If the value is greater than the fourth threshold, then a fifth step is executed, in which the current supplied to the first pin is cut off, and the first cutoff voltage V of the first pin at the first cutoff time point is detected. STP-1 and the cutoff second voltage V of the first pin at the second cutoff time point STP-2 If the second voltage V is cut off STP-2If the value is not greater than the fifth threshold, it is determined that there is a foreign object other than moisture attached to the first pin. If the first voltage V is cut off... STP-1 and cut off the second voltage V STP-2 If the difference is greater than the sixth threshold, it is determined that there is moisture attached to the first pin.

[0022] In the foreign object detection method, in the step of determining whether the device connected to the first pin is in a state of battery depletion, a fifth current I5 and a sixth current I6 are sequentially provided to the first pin, and a fifth voltage V corresponding to the fifth current I5 is detected. S5 and the sixth voltage (V) corresponding to the sixth current I6 S6 ), calculate the resistance values ​​of the fifth current I5 and the sixth current I6 respectively. If the resistance value of the relatively larger current of the fifth current I5 and the sixth current I6 is smaller, then it is determined that a device in a battery depleted state is connected to the first pin.

[0023] Technical effect

[0024] In this invention, according to an embodiment, the presence or type of foreign matter entering the connector can be detected to prevent the connector from being corroded or damaged due to foreign matter.

[0025] In this invention, according to an embodiment, it is possible to detect the presence or type of an external device connected to the connector.

[0026] In this invention, according to an embodiment, it is possible to confirm the removal status of foreign objects or devices on the connector. Attached Figure Description

[0027] Figure 1 A block diagram of a foreign object detection device according to an embodiment of the present invention is shown.

[0028] Figure 2 and Figure 3 The detailed configuration of a foreign object detection device according to an embodiment of the present invention is shown.

[0029] Figures 4 to 7 A foreign object detection method according to an embodiment of the present invention is shown.

[0030] Figure 8 A method for determining foreign object removal according to an embodiment of the present invention is shown.

[0031] Figure 9 The key points of a foreign object detection method according to an embodiment of the present invention are illustrated schematically. Detailed Implementation

[0032] In the following, some embodiments of the present invention will be described in detail with reference to the exemplary accompanying drawings. It should be noted that when affixing reference numerals to the constituent elements of the various drawings, the same reference numerals are assigned to the same constituent elements as much as possible, even if they are represented in different drawings. Furthermore, in describing the present invention, detailed descriptions of related known configurations or functions are omitted if it is determined that such detailed descriptions might obscure the spirit of the invention.

[0033] Furthermore, when describing the constituent elements of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the constituent element from other constituent elements, and do not limit the nature, order, or sequence of the constituent elements. When it is stated that a constituent element is "connected," "coupled," or "joined" with other constituent elements, the constituent element may be directly connected or joined to the other constituent elements, but it can also be understood that another constituent element may be "connected," "coupled," or "joined" between the constituent elements.

[0034] Figure 1 A block diagram of a foreign object detection device according to an embodiment of the present invention is shown. Figure 2 and Figure 3 The detailed configuration of a foreign object detection device according to an embodiment of the present invention is shown.

[0035] Figures 1 to 3 The foreign object detection device according to an embodiment of the present invention can be mounted not only on portable electronic devices such as smartphones, tablet PCs, PDAs, MP3 players, digital cameras, and netbooks, but also on electronic devices such as desktop PCs and servers to detect foreign objects or devices on connectors. According to the embodiment, the foreign object detection device can selectively detect the presence or absence of foreign objects or their types, or the presence or absence of devices or their types, attached to the connector at least in part. In this specification, for ease of explanation, these are referred to as a "foreign object detection device" or a "foreign object detection method," but the foreign object detection device or method of this embodiment should not be construed as being limited to the detection of "foreign objects" due to the use of these terms; in some cases, it should be understood that it may include the function of detecting the presence or absence of devices or their types.

[0036] Foreign object detection devices can be implemented as a separate device or within a device that performs another function. For example, a foreign object detection device can be implemented within a power management chip used in a smartphone.

[0037] Reference Figure 1The foreign object detection device may optionally include a current source 110, a pull-down circuit 120, a detection circuit 130, and a detection control unit 140. The connector 100 may be understood as not being included in the foreign object detection device, but in some cases, the connector 100 may be considered as a component of the foreign object detection device.

[0038] Connector 100 may include at least one pin. Connector 100 may be a general connection means for transmitting electrical signals or electrical energy. According to an embodiment, connector 100, as a connector for performing communication or power supply between an external device and an electronic device, may be a USB Type-C or USB PD (Power Delivery) Type-C connector with multiple pins. This is only an example; the foreign object detection device and method according to an embodiment of the present invention can be applied not only in the same or similar way to other types of USB connectors, but also in the same or similar way to connectors of various structures.

[0039] Current source 110 can supply current to the pins of connector 100. According to an embodiment, current source 110 can supply a different level of sensing current to a pin of the connector (hereinafter referred to as "first pin (P1)").

[0040] According to the embodiments, such as Figure 2 As shown, the current source 110 includes multiple unit current sources (Ii) capable of providing currents of different magnitudes. det I1, I5), used to determine each unit current source (I det Switches (I1, I5, etc.) are used to supply various currents of different magnitudes by controlling whether they are powered on or off.

[0041] According to the embodiments, such as Figure 3 As shown, the current source 110 can be implemented using a controllable variable current source I capable of adjusting the current magnitude and a switch. In this case, the magnitude and timing of the current provided by the variable current source I can be controlled by the detection control unit 140.

[0042] Pull-down circuit 120 can pull down the node connected to the first pin P1. For example, pull-down circuit 120 can connect the first pin P1 to a reference potential (e.g., ground) through a specified resistor. According to an embodiment, such as Figure 2 As shown, the pull-down circuit 120 may include a pull-down resistor R1 and a pull-down switch S1.

[0043] The detection circuit 130 can detect the voltage of the first pin P1. The detection circuit 130 may include a digital conversion unit such as an ADC (analog-digital converter) to perform digital conversion on the detected voltage of the first pin P1.

[0044] The detection control unit 140 controls the magnitude and timing of the detection current supplied to the first pin P1 through the current source 110, and can detect the voltage of the first pin P1 input from the detection circuit according to the control, so as to determine whether foreign matter is attached to the connector 100, the type of foreign matter attached, whether an external device is connected or the type of external device connected, etc.

[0045] When moisture or foreign matter other than moisture enters connector 100, or when an external device is connected to connector 100, the resistance value detected from the pin changes, which in turn changes the voltage detected at that pin. Detection control unit 140 monitors the voltage change at the pin to determine whether a foreign object has entered / what type it is, or whether an external device is connected / what type it is, and transmits this determination information to the processor of the electronic device. Alternatively, detection control unit 140 can directly output the determination information as visual or auditory (alarm) data via a display device or audio output device.

[0046] According to an embodiment, the detection control unit 140 detects the pull-down voltage V of the first pin P1 by connecting the pull-down resistor R1 to the first pin P1. S When the value is greater than the first threshold, it can be determined that a power supply device is connected to the first pin P1.

[0047] According to an embodiment, the detection control unit 140 detects the first voltage V of the first pin by providing a first current I1 to the first pin P1. S1 When the value is less than the second threshold, the connection status judgment subroutine can be entered.

[0048] According to the embodiment, in the connection state determination subroutine, the detection control unit 140 sequentially provides a second current I2 and a third current I3 to the first pin P1 through the current source 110, and detects the second voltage V of the first pin P1 through the detection circuit 130. S2 and the third voltage V S3 Based on the ratio of the second current I2 to the third current I3 and the second voltage V S2 With the third voltage V S3 The ratio is used to determine whether the material attached to the first pin P1 is a resistive component. If it is a resistive component, a subroutine is used to determine whether a rated device is connected. If it is not a resistive component, it can be determined that the device connected to the first pin P1 is not a rated device.

[0049] According to an embodiment, the detection control unit 140 provides a fourth current I4 to the first pin P1 via the current source 110, and the detection circuit 130 detects the fourth-to-first voltage V of the first pin P1 at a first time point after the fourth current I4 is provided. S4-1 and the 4-2 voltage V at the first pin at the second time point after providing the fourth current I4. S4-2 Based on the use of the fourth current I4 and the fourth-2nd voltage V S4-2 The calculated magnitude of the resistive component and the voltage V of the 4-1th voltage series. S4-1 and the 4-2 voltage V S4-2 The difference can be used to determine whether a rated device is connected.

[0050] According to the embodiment, if the fourth current I4 and the fourth-2nd voltage V are used S4-2 The calculated resistivity component is within the range of the rated resistance of the equipment, and is from the 4-2 voltage V. S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 If the obtained value is not greater than the fourth threshold, the detection control unit 140 can determine that a rated device is connected to the first pin P1.

[0051] According to an embodiment, the detection control unit 140 cuts off the current supplied to the first pin P1 through the current source 110, and the detection circuit 130 detects the first cutoff voltage V of the first pin P1 at the first cutoff time point. STP-1 and the cutoff second voltage V at the first pin P1 at the second cutoff time point STP-2 If the second voltage V is cut off STP-2 If the value is not greater than the fifth threshold, it is determined that there is a foreign object other than moisture attached to the first pin P1. If the first voltage V is cut off... STP-1 With the second voltage V cut off STP-2 If the difference is greater than the sixth threshold, it can be determined that there is moisture attached to the first pin P1.

[0052] According to the embodiment, the detection control unit 140 sequentially provides the sixth current I6 and the seventh current I7 to the first pin P1 and detects the sixth voltage V corresponding to the sixth current I6. S6 and the corresponding seventh voltage V of the seventh current I7 S7 Calculate the resistance values ​​of the sixth current I6 and the seventh current I7. When the resistance value of the relatively larger current I6 is relatively small, it can be determined that the device connected to the first pin P1 is in a state of battery depletion.

[0053] According to the embodiment, if the detection control unit 140 determines that a foreign object has entered the connector 100, it periodically provides a detection current to the first pin P1 to detect the voltage of the first pin P1. If the detected voltage is above a specified voltage, it determines that the foreign object has been removed, and the information can be output or transmitted to the processor of the electronic device.

[0054] According to the embodiment, the detection control unit 140 transmits the above-mentioned judgment information to the processor of the electronic device, or directly outputs it as visual or auditory (alarm) representation data through the display device or audio output device, so that the user can take necessary measures.

[0055] According to an embodiment, the detection control unit 140 can be implemented in hardware within an integrated circuit. Alternatively, the detection control unit 140 can be implemented in software. In this case, the detection control unit 140 can be executed by a processor while stored in a computer-readable storage medium. According to an embodiment, the detection control unit 140 can be implemented in an electronic device such as a smartphone by a processor that controls the overall operation.

[0056] Figures 4 to 7 A foreign object detection method according to an embodiment of the present invention is shown. Figures 4 to 7 The method can be found in the reference. Figures 1 to 3 The foreign object detection device described is in operation.

[0057] refer to Figure 4 The detection control unit 140 periodically pulls down the first pin P1 of the connector 100 to detect whether the connector 100 is connected to an externally powered device such as a charger (step S10).

[0058] When pull-down resistor R1 is connected to the first pin P1, if the pull-down voltage V of the first pin P1 is... S If the voltage exceeds the specified threshold (first threshold) (step S20), the detection control unit 140 can determine that a power supply device is connected to the connector 100 (step S30). This is because, when the detection control unit 140 does not provide current through the current source 110 and the first pin P1 is connected to the reference potential through a pull-down resistor, if the pull-down voltage V of the first pin P1... S If the value is higher than the first threshold, it indicates that an external power source is connected to the first pin P1. This judgment result can be transmitted as judgment information to the processor of the electronic device, or the judgment information can be displayed on the display unit.

[0059] If the pull-down voltage V of the first pin P1 SIf the threshold is below the first threshold, the detection control unit 140 can provide a first current I1 of a first magnitude to the first pin P1 to determine whether a foreign object has entered the first pin P1 of the connector 100 or whether an external device has been connected (step S40).

[0060] The detection control unit 140, which supplies the first current I1 to the first pin P1 of connector 100, detects the first voltage V of the first pin P1 through the detection circuit 130. S1 (Step S50) If the first voltage V detected at the first pin P1 S1 If the voltage is below the second threshold, then (from step S60) proceed to step S70 to execute the 'connection status judgment subroutine', if the first voltage V of the first pin P1 is below the threshold. S1 If the value exceeds the second threshold, then return to step S10. This is because, although a first current I1 is supplied to the first pin P1, the first voltage V of the first pin P1... S1 If the value does not rise above the baseline (second threshold), it can be determined that a foreign object has entered or that the device is connected to an external device.

[0061] Figure 5 yes Figure 4 This is an example of the connection status determination subroutine mentioned in the text.

[0062] refer to Figure 5 The detection control unit 140 controls the current source 110 to sequentially supply different magnitudes of second current I2 and third current I3 to the first pin P1 of the connector 100 for a predetermined duration. When the second current I2 and the third current I3 are sequentially supplied, the second voltage V of the first pin P1 is detected respectively. S2 and the third voltage V S3 (Step S110). The voltage detected at the first pin P1 when the second current I2 is provided is called the second voltage V. S2 The voltage detected at the first pin P1 when the third current I3 is provided is called the third voltage V. S3 .

[0063] Next, the detection control unit 140 can compare the intensity change ratio of the sequentially provided second current I2 and third current I3 with the second voltage V. S2 and the third voltage V S3 Whether the intensity change rate is consistent (step S120). Here, the determination of whether the change rate is consistent can be understood as allowing differences in the degree to which they can be considered substantially consistent. For example, whether the intensity change rate of the second current I2 and the third current I3 is consistent with the second voltage V. S2 and the third voltage V S3 The intensity change rate can be determined by the following mathematical formula 1 or mathematical formula 2, but is not limited to this.

[0064] [Mathematical Expression 1]

[0065] [Mathematical Expression 2]

[0066] Here, M, M1, and M2 can be understood as the margins given to determine whether they are consistent.

[0067] When the component connected to connector 100 is resistive, the current intensity satisfies the formula V=I·R, making the rate of change of current intensity consistent with the rate of change of voltage. When the component connected to connector 100 is not resistive, the rate of change of current intensity and the rate of change of voltage will generally not be consistent. Typically, under rated equipment conditions, the characteristics observed from the pins of connector 100 will resemble resistance; conversely, in the presence of foreign objects, the rate of change of current intensity and the rate of change of voltage will not be consistent.

[0068] Therefore, by checking whether the rate of change of current intensity matches the rate of change of voltage, one can initially determine whether a rated device with a resistive component or a foreign object has entered the connector 100. This can be understood as follows: the reason for using the expression "preliminary judgment" is that, in order to more accurately determine whether it is a rated device or a foreign object, further steps can be taken, such as... Figure 6 or Figure 7 The additional process is shown below.

[0069] That is, by using mathematical formula 1 or mathematical formula 2, it is determined whether the rate of change of current intensity and the rate of change of voltage are consistent (step S120). If they are consistent, it is possible that rated equipment is connected. Therefore, for a more detailed determination, further steps can be taken. Figure 6 The rated device determination subroutine shown is (step S140).

[0070] If the rate of change of current intensity and the rate of change of voltage are inconsistent, it is determined that the device connected to the first pin P1 is not a rated device, and the process can proceed to the step of determining the type of foreign object or other device (entered from 'A'). Figure 7 ).

[0071] At this time, upon entering Figure 7 Before determining the type of foreign object or other device, it may be selectively determined whether a device in a dead battery state is connected to the first pin P1 (step S130). Here, a dead battery state can be understood as a state in which the battery is completely discharged or in a low voltage state and is difficult to operate normally.

[0072] As an example of a method for determining whether a device connected to the first pin P1 is in a state of battery depletion, the detection control unit 140 sequentially provides a fifth current I5 and a sixth current I6 to the first pin P1, and detects the fifth voltage V corresponding to the fifth current I5. S5 and the sixth voltage V corresponding to the sixth current I6 S6 The resistance values ​​at the fifth current I5 and the sixth current I6 are calculated. If the resistance value at the relatively larger current I5 is relatively smaller, it can be determined that a device in a state of battery depletion is connected to the first pin P1 (step S150). For example, when the sixth current I6 is greater than the fifth current I5, the resistance value at the sixth current I6 is less than the resistance value at the fifth current I5, and it can be determined that the device is in a state of battery depletion.

[0073] At this time, in order to reduce the number of times current is applied, the detection control unit 140 can apply the voltage detected when the previous current was applied. For example, the detection control unit 140 can utilize at least one of the second current I2 and the third current I3 applied in step S110. Or, for example, refer to Figure 6 As shown, in step S110, following the second current I2 and the third current I3, the fourth current I4 (described later) is continuously applied and the voltage is detected. In step S130, following the fourth current I4, the fifth current I5 is continuously applied. The fourth current I4 and the fifth current I5 can be used to determine the battery depletion state. That is, it can be understood that although it has been explained above that the fifth current I5 and the sixth current I6 are used to check the battery depletion state, at least one of the fifth current I5 and the sixth current I6 can also be applied using the previously applied current.

[0074] Figure 6 yes Figure 5 This is an example of the rated device determination subroutine mentioned in the text. Figure 6 The rated device determination subroutine shown can be understood as a way to more accurately determine whether a device connected to connector 100 is a rated device by detecting the magnitude and / or the degree of change of the resistive component.

[0075] refer to Figure 6 The detection control unit 140 provides a fourth current I4 to the first pin P1, but the voltage V of the first pin P1 can be detected at different time points. S4-1 V S4-2 (Step S210) An example of different time points could be the start and end time points of the fourth current I4, but it is not limited to this. As described above, in Figure 5 In step S110, a fourth current I4 can be applied in succession following the second current I2 and the third current I3.

[0076] Then, the detection control unit 140 uses the fourth current I4 and voltage V S4-1 V S4-2 The magnitude of the resistive component is calculated (step S220), and the calculated magnitude of the resistive component is compared to see if it falls within the rated device resistance range (step S230). For example, two voltages V can be used. S4-1 V S4-2 Any one of them can be used to calculate the magnitude of the resistive component, but when using the voltage V detected later... S4-2 A stable resistance value can be calculated at that time, so it is preferred.

[0077] If the comparison result in step S230 shows that the calculated resistance component is within the rated equipment resistance range, it can be determined as rated equipment (step S280). If it is not within the rated equipment resistance range, it can be determined as non-rated equipment, and proceed via path 'A'. Figure 7 The process is shown below.

[0078] According to the embodiment, even when the comparison result in step S230 indicates that the calculated resistance component is within the rated device resistance range, the degree of change in the resistance component can be additionally checked (step S270) to determine whether it is a rated device. For example, when the comparison result in step S230 indicates that the calculated resistance component is within the rated device resistance range, the detection control unit 140 proceeds to step S270 (steps S240 and S250 will be explained later) to determine the 4-2 voltage V. S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 Whether the value is greater than the fourth threshold (step S270), when from the 4-2 voltage V S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 When the value is not greater than the fourth threshold, it can be determined as a rated device (step S280). When the voltage V from the 4th to 2nd threshold is... S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 When the value is greater than the fourth threshold, it can be determined as a non-rated device, and execution will be appended to the 'A' path. Figure 7 The process is shown below.

[0079] As mentioned above, two voltages V are considered when determining the rated equipment. S4-1 V S4-2 The reason for the difference is that even if the magnitude of the resistive component is within the rated equipment range, if the two voltages V S4-1 V S4-2 If the difference is greater than the threshold, it indicates that the resistance value has changed significantly, and therefore it may be suspected that there is an abnormal condition such as a short circuit with other pins.

[0080] Next, steps S240 and S250, which were not described above, will be explained. Steps S240 and S250 are the process of determining whether the component connected to connector 100 is a USB-C E-marked cable, such as... Figure 6 As shown, steps S230 and S270 can be selectively added as needed.

[0081] As an example of a method for inspecting a USB-C E-marked cable, when referring to... Figure 5 The description refers to the second voltage V detected when the second current I2 is provided. S2 Less than the first threshold voltage V used for cable determination TH-CBL1 The third voltage V detected when the third current I3 is provided. S3 Less than the second threshold voltage V used for cable determination TH-CBL2 The voltage V4-2 detected at the end of the fourth current I4 supply time. S4-2 Less than the third threshold voltage V used for cable identification TH-CBL3 At that time, the detection control unit 140 can determine that a USB-C E-mark cable is connected to the connector 100 (step S250).

[0082] As mentioned above, when in Figure 6 Step S230 determines that the resistive component is not within the rated equipment resistance range, or step S270 determines the 4-2 voltage V. S4-2 With voltage V of the 4th-1st S4-1 When the difference is large, additional execution can be performed as needed. Figure 7 The process.

[0083] Figure 7 The diagram illustrates a process for detecting voltage changes over time while current supply to the first pin P1 of connector 100 is stopped, and using this to determine the presence or absence of various devices / components; this can be understood as a "detailed foreign object / device determination subroutine." According to an embodiment, for simplified detection, this process may be omitted. Figure 7 The process, in this case, for in Figure 5 and Figure 6 If the condition enters "A", it can be determined that "there may be moisture or foreign matter other than moisture," and even this level of judgment can provide the user with meaningful results. Of course, when executing... Figure 7 The process shown allows for a more specific determination of the type of foreign object / equipment, and is therefore preferred.

[0084] Reference Figure 7 The detection and control unit 140 is in Figure 6 After applying the fourth current I4 in step S210, the current source 110 is cut off for a predetermined time T in step S290. STPAnd cut off at the first time point T STP1 and cut off the second time point T STP2 Each detects the voltage V of its first pin P1. STP-1 V STP-2 (Step S290). For example, the first cut-off time point can be immediately after the cut-off begins, and the second cut-off time point can be immediately before the cut-off ends, but is not limited thereto. According to an embodiment, in step S290, a relatively large pull-down resistor can be connected while the detection current is cut off.

[0085] Then, the detection control unit 140 will cut off the first time point T. STP1 The detected cut-off first voltage V STP-1 and at the second time point T when the cut is made STP2 The detected cut-off second voltage V STP-2 Substitute the predetermined condition formula and determine whether the condition formula is true or false to determine whether the component / element connected / entered in the connector 100 is at least one of CC-VBUS short circuit device, polarity (Gender) conversion device, moisture, and foreign matter other than moisture.

[0086] According to an embodiment, the detection control unit 140 determines that the second voltage V is cut off. STP-2 If the voltage is greater than the fifth threshold (step S300), then the second voltage V is cut off. STP-2 If the value is not greater than the fifth threshold, it can be determined that there is a foreign object other than moisture connected to the connector 100 (step S310).

[0087] When it is determined in step S300 that the second voltage V is cut off STP-2 When the value is greater than the fifth threshold, it can be determined whether the following mathematical formula 3 is satisfied (step S320).

[0088] [Mathematical Expression 3]

[0089] Here, M3 and M4 can be understood as the margins of tolerance given for determining the USB Type-C connector, and V S4-2 For reference Figure 6 As explained, the voltage was detected at the second time point when the fourth current I4 was cut off.

[0090] When it is determined in step S320 that mathematical formula 3 is satisfied and the type of connector 100 is USB type-C, the detection control unit 140 enters step S330 and determines the device connected to connector 100 as a CC-VBUS Short device, and can output or transmit the determination information to an external device.

[0091] If mathematical formula 3 is not satisfied in step S320, the detection control unit 140 can determine whether the following mathematical formula 4 is satisfied (step S340).

[0092] [Mathematical Expression 4]

[0093] Here, M5 and M6 can be understood as the margins of tolerance for error given to determine whether it is a polarity (Gender) conversion device.

[0094] If the connector 100 is USB-C and satisfies mathematical formula 4, the detection control unit 140 enters step S350 and determines the device connected to the connector 100 as a polarity conversion device, and can output or transmit the determination information to an external device.

[0095] When mathematical formula 4 is not satisfied in step S340, the detection control unit 140 can compare and cut off the first voltage V. STP-1 and cut off the second voltage V STP-2 The magnitude (step S360). In step S360, if the first voltage V is cut off... STP-1 and cut off the second voltage V STP-2 If they are substantially different (according to the embodiment, if the difference is large), the detection control unit 140 proceeds to step S370 and determines that moisture has entered the connector 100, and can output or transmit the determination information to an external device (step S370).

[0096] On the one hand, although Figure 7 Not shown in the diagram, but if it is determined in step S360 that the first voltage V is to be cut off... STP-1 and cut off the second voltage V STP-2 They are essentially different, and the second voltage V is cut off. STP-2 Greater than the first cutoff voltage V STP-1 If the connection status of connector 100 changes, the detection process can be restarted.

[0097] On the other hand, although Figure 7 The diagram shows steps S300, S320, S340, and S360 performed sequentially; however, steps S300, S320, S340, and S360 may be performed individually or in parallel after step S290. Alternatively, according to an embodiment, steps S300, S320, S340, and S360 may be performed in different ways. Figure 7 The order shown is as follows.

[0098] As described above, the foreign object detection method according to the embodiment of the present invention provides different magnitudes of detection current to the pins provided in the connector 100, detects the voltage of the pins, and compares it with predetermined thresholds or conditions, thereby more accurately determining moisture, foreign objects other than moisture, rated equipment, non-rated equipment, machines in a depleted battery state, etc. that have entered the connector 100.

[0099] However, despite having followed Figures 4 to 7 The sequence of methods exemplarily illustrates a preferred foreign object detection method according to one embodiment, but embodiments of the present invention are not necessarily performed in this order. As long as the key points of the methods for determining moisture, foreign objects other than moisture, or the types of various devices presented in this specification are maintained, Figures 4 to 7 The methods shown can be used without passing through Figures 4 to 7 The execution can be performed under the specified preceding process state, or the execution order can be changed.

[0100] On the other hand, as a flexible embodiment, when the presence of moisture or foreign matter other than moisture is detected, additional verification can be performed using a second pin adjacent to the first pin. For example, the aforementioned foreign matter detection method performed on the first pin can be applied to the second pin of the connector 100 for additional verification. Alternatively, a detection current for detecting moisture or foreign matter other than moisture can be simply provided to the second pin, and the voltage of the second pin can be detected. Figure 6 When the threshold value mentioned in step S60 is below the threshold, it can be determined that a foreign object has entered. At this time, the foreign object detection result using only the first pin can be used, or the foreign object detection results using both the first and second pins can be combined for a comprehensive judgment. For example, the above method can be performed on the first pin followed by the second pin. Figure 4 The brief inspection shown combines the inspection results of the first and second pins to make the final judgment on the first pin.

[0101] Furthermore, the detection control unit 140 of the foreign object detection device according to an embodiment of the present invention can also perform the following: Figure 8 The foreign object removal judgment procedure shown is used to detect the time point at which normal operation can resume after a foreign object is detected.

[0102] refer to Figure 8 The detection control unit 140 can provide a detection current I to the first pin P1 of the connector 100. DET (Step S400), and detect the voltage V of the first pin P1. DET (Step S410). If it is determined that the detected voltage V DETIf the voltage is above the specified voltage (step S420), it is determined that the foreign object has been removed, and the corresponding information can be output or transmitted to an external device (step S430).

[0103] At this time, due to the continuous supply of detection current I DET This may cause corrosion, so it is preferable to perform the above foreign matter removal judgment procedure only during the specified period of each specified cycle.

[0104] When using a single pin, the foreign object removal judgment procedure can be performed on that pin alone. When using two pins, if it is confirmed that the foreign object has been removed by first examining one pin, the remaining pins can be used to perform the foreign object removal judgment procedure to ultimately determine whether the foreign object removal is complete. Alternatively, according to the embodiment, after simultaneously checking both pins, the results of the checks on both pins can be combined to make a final judgment.

[0105] Furthermore, in the event of moisture detection, the power supply might be connected to connector 100 due to user carelessness. To prevent this, the detection control unit 140 does not provide the detection current I. DET During the period, the voltage fluctuation of the first pin P1 is periodically detected, and if a voltage fluctuation (especially a voltage rise) is detected, it is determined that an external power supply is connected, and this determination information is transmitted to the processor of the electronic device so that it can respond systematically.

[0106] Figure 9 A brief reference is shown. Figures 4 to 7 The method for detecting foreign objects is described. (Refer to...) Figure 9 In the following description, the terms / symbols for voltage, current, etc., unless otherwise stated, shall be understood to have the same meaning as those in the reference citation. Figures 1 to 8 The same terms / symbols used in the description have the same meaning.

[0107] As the first step S510, the foreign object detection method can be based on the pull-down voltage V. S Determine whether a power supply device is connected. To do this, the first step may include the following process: detecting the pull-down voltage V of pin P1 based on a pull-down resistor connected to a pin (pin 1) of connector 100. S The system determines whether a power supply device is connected to connector 100. According to an embodiment, if the voltage V is pulled down in the first step... S If the voltage is greater than the first threshold, it is determined that a power supply device is connected to the first pin P1. If the pull-down voltage V of the first pin is greater than the first threshold, it is determined that a power supply device is connected to the first pin P1. S If the value is not greater than the first threshold, then proceed to the second step described later.

[0108] In the second step S520, the first voltage V corresponding to the first current I1 can be used as a basis. S1 To determine whether to enter the connection state judgment subroutine. To this end, the second step may include the following process: based on the first voltage V of the first pin P1 detected by providing a first current I1 to the first pin P1. S1 The system then determines whether to enter the connection state judgment subroutine. According to the embodiment, in the second step, if the first voltage V of the first pin P1... S1 If the voltage is less than the second threshold, then in order to execute the connection status determination subroutine, proceed to the third step described later. If the first voltage V of the first pin P1 is less than the second threshold, then proceed to the third step described later. S1 If the value is not less than the second threshold, then we can return to the first step.

[0109] As the third step S530, the foreign object detection method, while changing the detection current, determines whether the component is resistive based on the current change ratio and voltage change ratio. If it is resistive, it is preliminarily determined that a rated device may be connected; if it is not resistive, it can be determined that no rated device is connected. Therefore, in this third step, the second voltage V of the first pin P1 is detected based on the second current I2 and the third current I3 sequentially supplied to the first pin P1. S2 and the third voltage V S3 This allows us to determine whether the material attached to the first pin P1 is a resistive component. According to an embodiment, when the ratio of the second current I2 to the third current I3 and the second voltage V... S2 With the third voltage V S3 When the difference between the ratios is less than the third threshold, it is determined that a rated device may be connected to the first pin P1, and the ratio of the second current I2 to the third current I3 and the second voltage V... S2 With the third voltage V S3 If the difference in the ratio is not less than the third threshold, it can be determined that no rated device is connected to the first pin P1.

[0110] According to an embodiment, when the component is determined to be resistive in the third step, a rated device determination subroutine can be entered for a more detailed determination of whether a rated device is connected. Furthermore, according to an embodiment, when the component is not resistive, it can be determined whether a device in a battery-depleted state is connected to the first pin P1. According to an embodiment, when it is determined that no device in a battery-depleted state is connected, a foreign object / device detailed determination subroutine can be entered.

[0111] As the fourth step S540, while providing the detection current, the resistance value and its change over time are calculated based on the voltage change, and it can be determined whether it is a rated device. If it is preliminarily determined in the third step that a rated device may be connected to the first pin P1, the fourth step S540 can be selectively executed for a more accurate determination. Therefore, the fourth step S540 may include providing a fourth current I4 to the first pin P1, based on the 4-1 voltage V of the first pin P1 at a first time point after providing the fourth current I4. S4-1 And the 4-2 voltage V at the second time point after providing the fourth current I4 on the first pin P1 S4-2 This allows us to determine whether a rated device is connected to the first pin P1. For example, the first time point could be the start time point of the fourth current I4 supply, and the second time point could be the end time point of the fourth current I4 supply, but it is not limited to these. According to an embodiment, in the fourth step, if the fourth current I4 and the fourth-second voltage V are used… S4-2 The calculated resistivity components are within the range of the rated resistance of the equipment, from voltage V (4-2). S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 If the value is not greater than the fourth threshold, it can be determined that a rated device is connected to the first pin P1.

[0112] As a fifth step S550, the type of foreign object and / or device can be determined based on the voltage change when the detection current is cut off. According to an embodiment, a relatively large pull-down resistor can be connected to the first pin simultaneously with cutting off the detection current. When it is determined in the fourth step S540 that the device is not rated, or in the third step that the battery is not depleted, the fifth step S550 can be selectively executed to more specifically determine the type of foreign object / device. For example, if the fourth current I4 and the fourth-second voltage V are used in the fourth step... S4-2 The calculated resistance component is outside the range of the rated resistance of the equipment, or is from the 4-2 voltage V. S4-2 Subtract the voltage V of the 4th-1st voltage S4-1 If the value is greater than the fourth threshold, then the fifth step can be further executed. According to an embodiment, in the fifth step, the current supplied to the first pin P1 is cut off, and the first cutoff voltage V of the first pin P1 at the first cutoff time point is set... STP-1 And the cut-off second voltage V of the first pin P1 at the second time point. STP-2 Perform a test; if the second voltage V is cut off... STP-2 If the value is not greater than the fifth threshold, it can be determined that there is a foreign object other than moisture attached to the first pin P1. If the first voltage V is cut off... STP-1 and cut off the second voltage V STP-2If the difference is greater than the sixth threshold, it can be determined that moisture adheres to the first pin P1. Furthermore, the fifth step may also include procedures for determining whether a CC-VBUS short-circuit device or a polarity reversal device is present.

[0113] For the terms "comprising," "consisting of," or "having," unless specifically stated otherwise, they indicate that the corresponding component may be included, but do not exclude other components, and should be understood to further include other components. Unless otherwise defined, all terms, including technical and scientific terms, have the same meaning as commonly understood by those skilled in the art. Commonly used terms, such as those defined in dictionaries, should be interpreted as consistent with their meaning in the relevant technical context, and should not be interpreted in an ideal or overly formal sense unless explicitly defined by the present invention.

[0114] The above description is merely an illustrative example of the technical concept of the present invention. Those skilled in the art can make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in this invention are not intended to limit the technical concept of the present invention, but rather to illustrate it, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of this invention should be interpreted by the appended claims, and all technical concepts within their equivalent scope should be understood to be included within the scope of the claims of this invention.

Claims

1. A foreign object detection device for detecting foreign objects or devices on a connector including at least one pin, the foreign object detection device comprising: A current source that provides a detection current of varying magnitudes to the first pin of the connector; A detection circuit that detects the voltage at the first pin; as well as A detection control unit controls the magnitude and timing of the detection current supplied to the first pin, and detects the voltage input from the detection circuit to the first pin according to this control, in order to detect foreign objects or devices attached to the connector. The first voltage (V) of the first pin is detected when a first current (I1) is supplied to the first pin. S1 When the value is less than the second threshold, the detection control unit enters the connection status judgment subroutine. In the connection status determination subroutine, the detection control unit sequentially provides a second current (I2) and a third current (I3) to the first pin through the current source, and detects the second voltage (V) corresponding to the second current (I2) on the first pin through the detection circuit. S2 ) and the corresponding third voltage (V) of the third current (I3). S3 Based on the ratio of the second current (I2) to the third current (I3) and the second voltage (V) S2 ) and the third voltage (V S3 The ratio is used to determine whether the material attached to the first pin is a resistive component. If it is a resistive component, the program enters the rated device determination subroutine to determine whether a rated device is connected. If it is not a resistive component, the program determines that the device connected to the first pin is not a rated device.

2. The foreign object detection device according to claim 1, characterized in that, The pull-down voltage (V) of the first pin is detected when a pull-down resistor is connected to the first pin. S When the value is greater than the first threshold, the detection control unit determines that a power supply device is connected to the first pin.

3. The foreign object detection device according to claim 1, characterized in that, The detection control unit provides a fourth current (I4) to the first pin through the current source, and detects the fourth-first voltage (V) of the first pin at a first time point after the fourth current (I4) is provided through the detection circuit. S4-1 ) and the 4-2 voltage (V) of the first pin at the second time point after providing the fourth current (I4). S4-2 Based on the use of the fourth current (I4) and the fourth-second voltage (V) S4-2 The magnitude of the resistive component calculated and the fourth-first voltage (V) S4-1 ) and the fourth-second voltage (V S4-2 The difference between the two values ​​is used to determine whether a rated device is connected.

4. The foreign object detection device according to claim 3, characterized in that, If the fourth current (I4) and the fourth-second voltage (V) are used S4-2 The magnitude of the calculated resistivity component is within the range of the rated resistance of the equipment, from the 4-2 voltage (V) S4-2 Subtract the 4-1 voltage (V) S4-1 If the value of ) is not greater than the fourth threshold, the detection control unit determines that a rated device is connected to the first pin.

5. The foreign object detection device according to claim 1, characterized in that, The detection and control unit cuts off the current supplied to the first pin through the current source, and the detection circuit detects the first cutoff voltage (V) of the first pin at the first cutoff time point. STP-1 ) and the cutoff second voltage (V) of the first pin at the second cutoff time point STP-2 If the second voltage (V) is cut off STP-2 If the value is not greater than the fifth threshold, it is determined that there is a foreign object other than moisture attached to the first pin. If the first voltage (V) is cut off STP-1 ) and cut off the second voltage (V STP-2 If the difference between the two values ​​is greater than the sixth threshold, it is determined that there is moisture attached to the first pin.

6. The foreign object detection device according to claim 1, characterized in that, When it is determined that the device connected to the first pin is not a rated device, the detection control unit sequentially provides a fifth current (I5) and a sixth current (I6) to the first pin, and detects the fifth voltage (V) corresponding to the fifth current (I5). S5 ) and the sixth voltage (V) corresponding to the sixth current (I6) S6 ), calculate the resistance values ​​of the fifth current (I5) and the sixth current (I6). If the resistance value of the relatively larger current (I5) and the sixth current (I6) is smaller, then it is determined that a device in a battery-depleted state is connected to the first pin.

7. A foreign object detection method, performed by a foreign object detection device for detecting foreign objects on a connector or a device, the foreign object detection method comprising: The first step involves detecting the pull-down voltage (V) of the first pin based on the pull-down resistor connected to the first pin of the connector. S ), determine whether a power supply device is connected to the connector; The second step involves detecting the first voltage (V) of the first pin based on the first current (I1) supplied to the first pin. S1 This determines whether to enter the connection state judgment subroutine. as well as The third step, in the connection status determination subroutine, involves detecting the second voltage (V) corresponding to the second current (I2) when the second current (I2) and the third current (I3) are sequentially supplied to the first pin. S2 ) and the third voltage (V) corresponding to the third current (I3) S3 According to the ratio of the second current (I2) to the third current (I3) and the second voltage (V) S2 ) and the third voltage (V S3 The ratio is used to determine whether the material attached to the first pin is a resistive component. Based on whether it is a resistive component, it is determined whether to enter the rated device determination subroutine to determine whether a rated device is connected to the first pin.

8. The foreign object detection method according to claim 7, characterized in that, In the first step, If the pull-down voltage (V) S If the value is greater than the first threshold, it is determined that a power supply device is connected to the first pin. If the pull-down voltage of the first pin (V) S If the value is not greater than the first threshold, proceed to the second step.

9. The foreign object detection method according to claim 7, characterized in that, In the second step, If the first voltage (V) of the first pin S1 If the value is less than the second threshold, then proceed to the third step. If the first voltage (V) of the first pin S1 If the value is not less than the second threshold, then return to the first step.

10. The foreign object detection method according to claim 7, characterized in that, In the third step, When the ratio of the second current (I2) to the third current (I3) and the second voltage (V) S2 ) and the third voltage (V S3 When the difference between the ratios is less than the third threshold, the system enters the rated equipment judgment subroutine. When the ratio of the second current (I2) to the third current (I3) and the second voltage (V) S2 ) and the third voltage (V S3 When the difference between the ratios of the first pin and the second pin is not less than the third threshold, it is determined whether the device connected to the first pin is in a state of battery depletion.

11. The foreign object detection method according to claim 7, characterized in that, The rated equipment determination subroutine also includes a fourth step. In the fourth step, a fourth current (I4) is provided to the first pin, based on the fourth-first voltage (V) of the first pin at a first time point after the fourth current (I4) is provided. S4-1 ) and the 4-2 voltage (V) of the first pin at the second time point after providing the fourth current (I4). S4-2 ), determine whether a rated device is connected to the first pin.

12. The foreign object detection method according to claim 11, characterized in that, In the fourth step, if the fourth current (I4) and the fourth-second voltage (V) are used... S4-2 The magnitude of the calculated resistivity component is within the range of the rated resistance of the equipment, from the 4-2 voltage (V) S4-2 Subtract the 4-1 voltage (V) S4-1 If the value of ) is not greater than the fourth threshold, it is determined that a rated device is connected to the first pin.

13. The foreign object detection method according to claim 12, characterized in that, In the fourth step, if the fourth current (I4) and the fourth-second voltage (V) are used... S4-2 The magnitude of the calculated resistance component is outside the range of the rated resistance of the equipment, or is derived from the voltage (V) of the fourth-second voltage. S4-2 Subtract the 4-1 voltage (V) S4-1 If the value of ) is greater than the fourth threshold, then proceed to the fifth step. In the fifth step, Cut off the current supplied to the first pin, and detect the first cutoff voltage (V) of the first pin at the first cutoff time point. STP-1 ) and the cutoff second voltage (V) of the first pin at the second cutoff time point STP-2 If the second voltage (V) is cut off STP-2 If the value is not greater than the fifth threshold, it is determined that there is a foreign object other than moisture attached to the first pin. If the first voltage (V) is cut off... STP-1 ) and cut off the second voltage (V STP-2 If the difference between the two values ​​is greater than the sixth threshold, it is determined that there is moisture attached to the first pin.

14. The foreign object detection method according to claim 10, characterized in that, In the step of determining whether the device connected to the first pin is in a state of battery depletion. A fifth current (I5) and a sixth current (I6) are sequentially supplied to the first pin, and a fifth voltage (V) corresponding to the fifth current (I5) is detected. S5 ) and the sixth voltage (V) corresponding to the sixth current (I6) S6 ), calculate the resistance values ​​of the fifth current (I5) and the sixth current (I6). If the resistance value of the relatively larger current (I5) and the sixth current (I6) is smaller, then it is determined that a device in a battery-depleted state is connected to the first pin.

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