Foreign matter detection circuit

Abstract

The utility model discloses a foreign matter detection circuit, and relates to the technical field of interface detection, and the foreign matter detection circuit comprises a foreign matter detection module which is connected with a female seat interface and is used for outputting a foreign matter signal when detecting that a foreign matter exists in the female seat interface; the control module is connected with the foreign matter detection module, and the control module is used for receiving the foreign matter signal and outputting a foreign matter reminding signal; and the reminding module is connected with the control module, and the reminding module is used for receiving the foreign matter reminding signal and outputting alarm information. The problem that high temperature is caused when conductive foreign matter exists at the Type C interface can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of interface detection, and in particular to a foreign body detection circuit. Background Art

[0002] Due to the physical characteristics of the Type-C interface, such as small size, dense pins, and a pin center spacing of 0.5mm, electronic devices on the market generally use the Type C interface to replace the previous Micro USB (a portable version of the USB 2.0 standard) and Mini USB (a USB interface standard) interfaces.

[0003] When a traditional TYPE C interface product has conductive foreign matter in the interface due to water ingress or other events, if the user does not wait for the liquid in the Type C interface to completely evaporate before charging, it will cause an ionization reaction between the Type C pins, causing the pins to widen. In severe cases, the Type C pins may short-circuit, causing high temperature and causing the Type C interface to deform or burn. Utility Model Content

[0004] The main purpose of the present application is to provide a foreign object detection circuit, which aims to solve the technical problem of high temperature caused by the presence of conductive foreign objects at the Type C interface.

[0005] To achieve the above object, the present application provides a foreign body detection circuit, the foreign body detection circuit comprising:

[0006] A foreign object detection module, the foreign object detection module is connected to the female socket interface, and is used to output a foreign object signal when a foreign object is detected in the female socket interface;

[0007] A control module, the control module is connected to the foreign object detection module, and the control module is used to receive the foreign object signal and output a foreign object warning signal;

[0008] A reminder module is connected to the control module and is used to receive the foreign object reminder signal and output alarm information.

[0009] In one embodiment, the foreign object detection circuit includes: a power supply module, and the power supply module includes:

[0010] A first diode, wherein a first end of the first diode is connected to a power supply pin of the female socket interface;

[0011] a second diode, wherein a first end of the second diode is connected to a system power supply end, and a second end of the second diode is respectively connected to a second end of the first diode and a foreign object detection module;

[0012] A first capacitor, wherein a first end of the first capacitor is connected to a second end of the second diode, and a second end of the first capacitor is grounded.

[0013] In one embodiment, the foreign body detection module includes: a first detection module, the first detection module includes:

[0014] a third diode, a first end of the third diode being connected to the control module;

[0015] a first resistor, wherein a first end of the first resistor is connected to a second end of the third diode;

[0016] A first comparator, wherein a first input end of the first comparator is respectively connected to the second end of the first resistor and the power supply pin of the female socket interface, an output end of the first comparator is connected to the control module, and a power supply end of the first comparator is connected to a first end of the first capacitor;

[0017] a second resistor, wherein a first end of the second resistor is connected to the control module, and a second end of the second resistor is connected to the second input end of the first comparator;

[0018] a third resistor, a first end of the third resistor being connected to a second end of the second resistor, and a second end of the third resistor being grounded;

[0019] A fourth resistor, wherein a first end of the fourth resistor is connected to the output end of the first comparator, and a second end of the fourth resistor is connected to the system power supply end.

[0020] In one embodiment, the foreign object detection module includes: a second detection module, and the second detection module includes:

[0021] a fifth resistor, wherein a first end and a second end of the fifth resistor are connected to the control module;

[0022] a fourth diode, wherein a first end of the fourth diode is connected to a power supply pin of the female socket interface, and a second end of the fourth diode is connected to the control module;

[0023] Alternatively, the foreign body detection module includes: a third detection module, and the third detection module includes:

[0024] a sixth resistor, wherein a first end of the sixth resistor is connected to the system power supply end, and a second end of the sixth resistor is connected to the control module;

[0025] a seventh resistor, a first end of the seventh resistor being connected to the control module;

[0026] A first transistor, wherein the control end of the first transistor is connected to the second end of the seventh resistor, the first end of the first transistor is connected to the second end of the sixth resistor, and the second end of the first transistor is grounded.

[0027] In one embodiment, the foreign object detection circuit further includes:

[0028] An eighth resistor, a first end of the eighth resistor is connected to the first communication end of the female socket interface, and a second end of the eighth resistor is connected to the foreign object detection module;

[0029] A ninth resistor, wherein a first end of the ninth resistor is connected to the second communication end of the female socket interface, and a second end of the ninth resistor is connected to the foreign object detection module.

[0030] In one embodiment, the foreign object detection module includes: a fourth detection module, and the fourth detection module includes:

[0031] a tenth resistor, a first end of the tenth resistor being connected to the first end of the first capacitor;

[0032] an eleventh resistor, a first end of the eleventh resistor being connected to a second end of the tenth resistor, and a second end of the eleventh resistor being grounded;

[0033] a second comparator, wherein a first input terminal of the second comparator is connected to the second terminal of the tenth resistor, a second input terminal of the second comparator is respectively connected to the second terminal of the eighth resistor and the second terminal of the ninth resistor, an output terminal of the second comparator is connected to the control module, and a power supply terminal of the second comparator is connected to the first terminal of the first capacitor;

[0034] a twelfth resistor, a first end of the twelfth resistor being connected to the second input end of the second comparator, and a second end of the twelfth resistor being grounded;

[0035] A second capacitor, wherein a first end of the second capacitor is connected to the first end of the eleventh resistor, and a second end of the second capacitor is grounded.

[0036] In one embodiment, the foreign body detection module includes: a fifth detection module, and the fifth detection module includes:

[0037] a thirteenth resistor, a first end of the thirteenth resistor being connected to the second end of the eighth resistor and the second end of the ninth resistor respectively, and a second end of the thirteenth resistor being grounded;

[0038] a third capacitor, a first end of the third capacitor being connected to the first end of the thirteenth resistor, and a second end of the third capacitor being grounded;

[0039] a fifth diode, a first end of the fifth diode being connected to the first end of the thirteenth resistor, and a second end of the fifth diode being grounded;

[0040] Alternatively, the foreign body detection module includes: a sixth detection module, and the sixth detection module includes:

[0041] a fourteenth resistor, a first end of the fourteenth resistor being connected to the system power supply end, and a second end of the fourteenth resistor being connected to the control module;

[0042] a second triode, wherein a control end of the second triode is respectively connected to the second end of the eighth resistor and the second end of the ninth resistor, a first end of the second triode is connected to the second end of the fourteenth resistor, and a second end of the second triode is grounded;

[0043] a fifteenth resistor, a first end of the fifteenth resistor being connected to the control end of the second transistor, and a second end of the fifteenth resistor being grounded;

[0044] A fourth capacitor, wherein a first end of the fourth capacitor is connected to the first end of the fifteenth resistor, and a second end of the fourth capacitor is grounded.

[0045] In one embodiment, the foreign object detection circuit further includes: a shutdown protection module, and the shutdown protection module includes:

[0046] A sixth diode, a first end of the sixth diode being connected to the first protection pin of the female socket interface;

[0047] a seventh diode, wherein a first end of the seventh diode is connected to the second protection pin of the female socket interface, and a second end of the seventh diode is connected to the second end of the sixth diode;

[0048] A sixteenth resistor, wherein a first end of the sixteenth resistor is connected to the second end of the sixth diode, and a second end of the sixteenth resistor is connected to the control module.

[0049] In one embodiment, the foreign object detection circuit further includes: a hiccup protection module, and the hiccup protection module includes:

[0050] A field effect tube, wherein the control end of the field effect tube is connected to the control module, the first end of the field effect tube is connected to the power supply pin of the female socket interface, and the second end of the field effect tube is grounded.

[0051] In one embodiment, the reminder module includes:

[0052] A voice prompt unit, the voice prompt unit is connected to the control module;

[0053] A display prompt unit, the display prompt unit is connected to the control module;

[0054] An antenna unit is connected to the control module.

[0055] The present application provides a foreign object detection circuit, the foreign object detection circuit comprising: a foreign object detection module, the foreign object detection module is connected to the mother seat interface, and is used to output a foreign object signal when a foreign object is detected in the mother seat interface; a control module, the control module is connected to the foreign object detection module, the control module is used to receive the foreign object signal and output a foreign object reminder signal; a reminder module, the reminder module is connected to the control module, and the reminder module is used to receive the foreign object reminder signal and output an alarm message. The present application detects whether there is a foreign object at the mother seat interface (i.e., TYPE C interface), and when a foreign object is detected, a foreign object reminder is issued through the reminder module, so that conductive foreign objects such as liquids at the mother seat interface are cleaned up, thereby preventing the ionization reaction between the TYPE C pins, causing the TYPE C pins to short-circuit and cause high temperature, resulting in deformation, burning, and other phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic diagram of the structure of a foreign body detection circuit provided in one embodiment of the present application;

[0057] Figure 2 A schematic diagram of the structure of a power supply module in a foreign object detection circuit provided in an embodiment of the present application;

[0058] Figure 3 A schematic diagram of the structure of a foreign object detection module in a foreign object detection circuit provided in the first embodiment of the present application;

[0059] Figure 4 A schematic diagram of the structure of a foreign object detection module in a foreign object detection circuit provided in the second embodiment of the present application;

[0060] Figure 5 A schematic diagram of the structure of a foreign object detection module in a foreign object detection circuit provided in the third embodiment of the present application;

[0061] Figure 6 A schematic diagram of the structure of a hiccup protection module in a foreign object detection circuit provided in a fourth embodiment of the present application;

[0062] Figure 7 A schematic diagram of the structure of a shutdown protection module in a foreign object detection circuit provided in an embodiment of the present application;

[0063] Figure 8 A schematic diagram of the structure of a hiccup protection module in a foreign object detection circuit provided in an embodiment of the present application;

[0064] Fig. 9This is a schematic diagram of the structure of a reminder module in a foreign object detection circuit provided in one embodiment of the present application.

[0065] Description of Figure Numbers:

[0066] 10. Control module; 20. Foreign object detection module; 30. Reminder module; T1. Female connector; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; R6. Sixth resistor; R7. Seventh resistor; R8. Eighth resistor; R9. Ninth resistor; R10. Tenth resistor; R11. Eleventh resistor; R12. Twelfth resistor; R13. Tenth Three resistors; R14, the fourteenth resistor; R15, the fifteenth resistor; R16, the sixteenth resistor; U1, the first comparator; U2, the second comparator; VBUS, the power supply pin of the female socket interface; D1, the first diode; D2, the second diode; D3, the third diode; D4, the fourth diode; D5, the fifth diode; D6, the sixth diode; the seventh diode; SYS, the system power supply end; K1, the field effect transistor; 31, the voice prompt module; 32, the display prompt module; 33, the antenna unit.

[0067] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0068] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0069] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0070] The main solution of the embodiment of the present application is: a foreign object detection circuit, including: a foreign object detection module, the foreign object detection module is connected to the female socket interface, and is used to output a foreign object signal when a foreign object is detected in the female socket interface; a control module, the control module is connected to the foreign object detection module, the control module is used to receive the foreign object signal and output a foreign object reminder signal; a reminder module, the reminder module is connected to the control module, and the reminder module is used to receive the foreign object reminder signal and output an alarm message.

[0071] Due to the physical characteristics of the Type-C interface, such as small size, dense pins, and a pin center spacing of 0.5mm. Electronic devices on the market generally use the Type C interface to replace the previous Micro USB (a portable version of the USB 2.0 standard) and Mini USB (a USB interface standard) interfaces. When the traditional TYPE C interface products have conductive foreign matter at the interface due to water ingress and other events, if the user does not wait for the liquid in the Type C interface to completely evaporate before charging, it will cause an ionization reaction between the Type C pins, causing the pins to widen. In severe cases, it will cause the Type C pins to short-circuit and cause high temperature, causing the Type C interface to deform and burn.

[0072] The present application detects whether there is a foreign object at the female socket interface (i.e., TYPE C interface). When a foreign object is detected, a foreign object reminder is issued through a reminder module, so that conductive foreign objects such as liquids at the female socket interface are cleaned up, thereby preventing an ionization reaction between the TYPE C pins, causing a short circuit of the TYPE C pins, causing high temperature, and leading to deformation, burning, and the like.

[0073] Based on this, the present application proposes a foreign body detection circuit, referring to Figure 1 , Figure 1 This is a schematic diagram of the structure of a foreign body detection circuit provided in an embodiment of the present application, wherein the foreign body detection circuit comprises:

[0074] A foreign object detection module 20, which is connected to the female socket interface T1 and is used to output a foreign object signal when a foreign object is detected in the female socket interface;

[0075] A control module 10, wherein the control module 10 is connected to the foreign object detection module 20, and the control module 10 is used to receive the foreign object signal and output a foreign object warning signal;

[0076] The reminding module 30 is connected to the control module 10 and is used for receiving the foreign object reminding signal and outputting alarm information.

[0077] In this embodiment, the foreign object detection module 20 detects whether there is a foreign object in the female socket interface T1. If a foreign object is detected, a foreign object signal is output to the control module 10. After receiving the foreign object signal, the control module 10 outputs a reminder signal to the reminder module 30. The reminder module 30 outputs an alarm message to remind the user to clean the interface, thereby preventing the ionization reaction between the TYPE C pins, causing the TYPE C pins to short-circuit and cause high temperature, resulting in deformation, burning, etc.

[0078] It should be noted that the female socket interface T1 is a TYPE C port, that is, a TYPE C interface, and the control module 10 can specifically be an MCU (Microcontroller Unit). The present application can be applied to a si nk (receiving end) device, a source (transmitting end) device, and can also be applied to a device higher than a DP (Disp layPort, interface element).

[0079] In some possible implementations, reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a power supply module in a foreign object detection circuit provided in an embodiment of the present application. The foreign object detection circuit includes: a power supply module 40, and the power supply module 40 includes:

[0080] A first diode D1, wherein a first end of the first diode D1 is connected to a power supply pin VBUS of the female socket interface T1;

[0081] A second diode D2, wherein a first end of the second diode D2 is connected to the system power supply end SYS, and a second end of the second diode D2 is respectively connected to the second end of the first diode D1 and the foreign object detection module 20;

[0082] A first capacitor C1 , wherein a first end of the first capacitor C1 is connected to a second end of the second diode D2 , and a second end of the first capacitor C1 is grounded.

[0083] In this embodiment, the first end of the first diode D1 is connected to the A4, A9, B4 and B9 pins of the female socket interface T1 respectively, and the A4, A9, B4 and B9 pins of the female socket interface T1 are the power supply pins VBUS. The power supply module 40 supplies power to the foreign object detection module 20, that is, the second end of the first diode D1 supplies power to the foreign object detection module 20 based on COM_VCC, and the first diode D1 and the second diode D2 can use bidirectional diodes, that is, they are replaced by one device.

[0084] Exemplarily, when no adapter is inserted into the female socket interface, the system power supply terminal SYS is stabilized through the first diode D1, the second diode D2 and the first capacitor C1 to supply power to the foreign object detection module 20. When the adapter is inserted into the female socket interface, the power supply pin VBUS of the female socket interface T1 is stabilized through the first diode D1, the second diode D2 and the first capacitor C1 to supply power to the foreign object detection module 20.

[0085] In some possible implementations, reference Figure 3 , Figure 3This is a schematic diagram of the structure of a foreign body detection module in a foreign body detection circuit provided in the first embodiment of the present application. The foreign body detection module 20 includes: a first detection module 21, and the first detection module 21 includes:

[0086] A third diode D3, a first end of the third diode D3 is connected to the control module 10;

[0087] a first resistor R1, wherein a first end of the first resistor R1 is connected to a second end of the third diode D3;

[0088] A first comparator U1, wherein a first input end of the first comparator U1 is respectively connected to the second end of the first resistor R1 and the power supply pin of the female socket interface T1, an output end of the first comparator U1 is connected to the control module 20, and a power supply end of the first comparator U1 is connected to a first end of the first capacitor C1;

[0089] A second resistor R2, wherein a first end of the second resistor R2 is connected to the control module 10, and a second end of the second resistor R2 is connected to a second input end of the first comparator U1;

[0090] a third resistor R3, wherein a first end of the third resistor R3 is connected to a second end of the second resistor R2, and a second end of the third resistor R3 is grounded;

[0091] A fourth resistor R4 , wherein a first end of the fourth resistor R4 is connected to the output end of the first comparator U1 , and a second end of the fourth resistor R4 is connected to the system power supply end SYS.

[0092] In this embodiment, the first input terminal of the first comparator U1 can be a positive input terminal, and the second input terminal can be a negative input terminal. The first detection module 21 is used to detect the foreign body state of the interface module 30 when no external adapter is inserted. Specifically, the control module 10 outputs PWM_WAVE through the third diode D3 and then through the first resistor R1 to apply to the VBUS network, and the PWM_WAVE signal is used as a detection signal. The VBUS voltage is input to the first input terminal of the first comparator U1. At the same time, the voltage VREF1 of PWM_WAVE after the third resistor R3 and the fourth resistor R4 divides the voltage is input to the second input terminal of the first comparator U1. At this time, the voltage of VBUS is:

[0093]

[0094] It should be noted that, under normal circumstances, the circuit between VBUS and GND in the TYPE C port is open, and R VBUS_GND =∞Ω, at this time the VBUS voltage is VBUS=V PWM_WAVE -V D2, At this time, VBUS > VREF1, and the first comparator U1 outputs an open - circuit signal to the control module 30. Since the system power supply terminal SYS supplies power to the output of the first comparator U1 through the fourth resistor R4, the signal Liquid_DET1 output at the output terminal of the first comparator U1 is at a high level.

[0095] When there is a conductive foreign object or liquid inside the TYPE - C port, there is an equivalent resistor R between VBUS and GND liquid1 , and at this time, the VBUS voltage is:

[0096]

[0097] Due to the foreign object inside the TYPE - C port causing a drop in the VBUS voltage, when VBUS < VREF1, the output of the first comparator U1 conducts to GND. At this time, the signal Liquid_DET1 output at the output terminal of the first comparator U1 is at a low level, and the low - level Liquid_DET1 is used as a foreign - object signal.

[0098] In summary, the control module 10 can determine whether there is a foreign object or liquid in the TYPE - C port by detecting the level state of Liquid_DET1 output by the first comparator U1, and then remind the user through the reminder module 30. Thus, the ionization reaction between the TYPE - C pins is prevented, and phenomena such as short - circuit of the TYPE - C pins causing high temperature and resulting in deformation and burning are avoided.

[0099] It should be noted that the PWM_WAVE signal is not a continuous PWM waveform, but outputs a high level at intervals. For example, it outputs a 1 - second high level every 5 minutes. Thus, the continuous output of the PWM_WAVE signal is prevented from causing an ionization reaction on the VBUS pin, which instead accelerates the damage of the TYPE - C port.

[0100] In some feasible embodiments, refer to Figure 4 , Figure 4 is a schematic structural diagram of a foreign - object detection module in the foreign - object detection circuit provided in the second embodiment of the present application. The foreign - object detection module 20 includes: a second detection module 22, and the second detection module 22 includes:

[0101] A fifth resistor R5, the first end and the second end of the fifth resistor R5 are connected to the control module 10;

[0102] A fourth diode D4, the first end of the fourth diode D4 is connected to the power - supply pin VBUS of the female - seat interface T1, and the second end of the fourth diode D4 is connected to the control module 10;

[0103] Or, the third detection module 23 includes:

[0104] a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to the system power supply terminal SYS, and a second end of the sixth resistor R6 is connected to the control module 10;

[0105] a seventh resistor R7, wherein a first end of the seventh resistor R7 is connected to the control module 10;

[0106] A first transistor Q1, wherein a control end of the first transistor Q1 is connected to a second end of the seventh resistor R7, a first end of the first transistor Q1 is connected to a second end of the sixth resistor R6, and a second end of the first transistor Q1 is grounded.

[0107] In this embodiment, the first detection module 21, the second detection module 22 and the third detection module 23 respectively detect foreign objects when no external adapter is inserted. The first detection module 21 detects by a comparator, the second detection module 22 detects by an ADC, and the third detection module 23 detects by a GPIO (Genera l-purpose input / output). Figure 4 As shown in (A), the PWM_WAVE signal output by the control module 10 is given to VBUS through the fifth resistor R5 and the fourth diode D4. When there is a conductive foreign object or liquid inside the TYPE C port, there is resistance between VBUS and the ground, causing the voltage on the right side of the fifth resistor R5 to drop, and the signal given to the Liquid_DET ADC1 of the control module 10 is low level, and the low level signal is used as a foreign object signal. Figure 4 As shown in (B), the PWM_WAVE signal output by the control module 10 is given to the first transistor Q1 through the seventh resistor R7. When there is a conductive foreign object or liquid inside the TYPE C port, the first transistor Q1 is closed, and the Li qu i d_DET IO1 signal given to the control module 10 is a low level, and the low level signal is used as a foreign object signal.

[0108] In some possible implementations, reference Figure 5 , Figure 5 This is a schematic diagram of the structure of a foreign body detection module in a foreign body detection circuit provided in the third embodiment of the present application, wherein the foreign body detection circuit further includes:

[0109] An eighth resistor R8, a first end of the eighth resistor R8 is connected to the first communication end SBU1 of the female socket interface T1, and a second end of the eighth resistor R8 is connected to the foreign object detection module 20;

[0110] A ninth resistor R9 , wherein a first end of the ninth resistor R9 is connected to the second communication end SBU2 of the female socket interface T1 , and a second end of the ninth resistor R9 is connected to the foreign object detection module 20 .

[0111] In this embodiment, the eighth resistor R8 and the ninth resistor R9 are used to detect whether there is a foreign object in the TYPE C port when the external adapter is inserted.

[0112] In some possible implementations, reference Figure 5 The foreign body detection module 20 includes: a fourth detection module 24, and the fourth detection module 24 includes:

[0113] a tenth resistor R10, a first end of the tenth resistor R10 being connected to a first end of the first capacitor C1;

[0114] an eleventh resistor R11, a first end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, and a second end of the eleventh resistor R11 is grounded;

[0115] a second comparator U2, wherein a first input terminal of the second comparator U2 is connected to a second terminal of the tenth resistor R10, a second input terminal of the second comparator U2 is respectively connected to a second terminal of the eighth resistor R8 and a second terminal of the ninth resistor R9, an output terminal of the second comparator U2 is connected to the control module 10, and a power supply terminal of the second comparator U2 is connected to a first terminal of the first capacitor C1;

[0116] a twelfth resistor R12, a first end of the twelfth resistor R12 is connected to the second input end of the second comparator U2, and a second end of the twelfth resistor R12 is grounded;

[0117] A second capacitor C2, wherein a first end of the second capacitor C2 is connected to a first end of the eleventh resistor R11, and a second end of the second capacitor C2 is grounded.

[0118] In this embodiment, the first input terminal of the second comparator U2 can be a positive input terminal, and the second input terminal can be a negative input terminal. When the external adapter is inserted, VBUS is stabilized by the first diode D1 and the first capacitor C1 to supply power to the second comparator U2. At the same time, VERF2 is provided to the first input terminal of the second comparator U2 through the tenth resistor R10 and the eleventh resistor R11. When there is no foreign matter or liquid in the TYPE C port, the circuit between SBU1 and SBU2 and VBUS is open, and the second input terminal of the second comparator U2 is pulled down to 0V potential through the twelfth resistor R12. At this time, VERF2>0V, and the output of the second comparator U2 is open, that is, Liquid_DET2 output to the control module 10 is high level.

[0119] When there is foreign matter or liquid in the TYPE C port, since the SBU1, SUB2 and VBUS pins are adjacent, there is an equivalent resistance R between VBUS and SBU1, SBU2. Liquid2 and R Liquid3 , at this time VBUS passes through R Liquid2 , the eighth resistor R8, R Liquid3 , the ninth resistor R9 is fed to the second input terminal of the second comparator U2. At this time, the voltage input to the second input terminal of the second comparator U2 is:

[0120]

[0121] The liquid inside the TYPE C port causes the second input terminal V of the second comparator U2 to TYPEC_SBU >VREF2, so that the output of the second comparator U2 is turned on to GND. At this time, Liquid_DET2 output to the control module 10 is at a low level, and the low level signal is used as a foreign object signal.

[0122] In summary, the control module 10 can determine whether there is a foreign object or liquid in the TYPE C port by detecting the level state of Liquid_DET2 output by the second comparator U2, and thus remind the user through the reminder module 30, thereby preventing the ionization reaction between the TYPE C pins from causing the TYPE C pins to short-circuit and cause high temperature, resulting in deformation, burning, etc.

[0123] It should be noted that Liquid_DET1 output by the first comparator U1 and Liquid_DET2 output by the second comparator U2 are simultaneously connected to one pin of the control module 10 , or are respectively connected to two pins of the control module 10 .

[0124] In this embodiment, the fourth detection module 24 can be specifically two, in which the second input end of the second comparator U2 in one of the fourth detection modules 24 is connected to the second end of the eighth resistor R8, and the second input end of the second comparator U2 in the other fourth detection module 24 is connected to the second end of the ninth resistor R9, thereby realizing detection of SBU1 of the female socket interface T1 and SBU2 of the female socket interface T1 respectively.

[0125] In addition, it should be noted that when a device with a TYPE C port charges an external device, it still detects V TYPEC_SBU The specific working principle of judging whether there is foreign matter or liquid in the TYPE C port is the same as the principle of detecting when an external adapter is inserted, that is, the control module 10 judges it as a foreign matter signal when Liquid_DET2 output by the second comparator U2 is at a low level.

[0126] In some possible implementations, reference Figure 6 , Figure 6 This is a structural diagram of a hiccup protection module in a foreign object detection circuit provided in a fourth embodiment of the present application. The foreign object detection module 20 includes: a fifth detection module 25, and the fifth detection module 25 includes:

[0127] a thirteenth resistor R13, wherein a first end of the thirteenth resistor R13 is respectively connected to the second end of the eighth resistor R8 and the second end of the ninth resistor R9, and a second end of the thirteenth resistor R13 is grounded;

[0128] a third capacitor C3, wherein a first end of the third capacitor C3 is connected to a first end of the thirteenth resistor R13, and a second end of the third capacitor C3 is grounded;

[0129] a fifth diode D5, wherein a first end of the fifth diode D5 is connected to a first end of the thirteenth resistor R13, and a second end of the fifth diode D5 is grounded;

[0130] Alternatively, the foreign body detection module 20 includes: a sixth detection module 26, and the sixth detection module 26 includes:

[0131] A fourteenth resistor R14, a first end of the fourteenth resistor R14 is connected to the system power supply terminal SYS, and a second end of the fourteenth resistor R14 is connected to the control module 10;

[0132] a second triode Q2, wherein a control end of the second triode Q2 is respectively connected to the second end of the eighth resistor R8 and the second end of the ninth resistor R9, a first end of the second triode Q2 is connected to the second end of the fourteenth resistor R14, and a second end of the second triode Q2 is grounded;

[0133] a fifteenth resistor R15, a first end of the fifteenth resistor R15 is connected to the control end of the second transistor Q2, and a second end of the fifteenth resistor R15 is grounded;

[0134] A fourth capacitor C4, a first end of the fourth capacitor C4 is connected to the first end of the fifteenth resistor R15, and a second end of the fourth capacitor C4 is grounded.

[0135] In this embodiment, the fourth detection module 24, the fifth detection module 25 and the sixth detection module 26 respectively detect foreign objects when the external adapter is inserted, the fourth detection module 24 detects through a comparator, the fifth detection module 25 detects through an ADC (digital-to-analog conversion), and the sixth detection module 26 detects through a GPIO (Genera l-purpose input / output). Figure 6As shown in (A) in FIG. 1 , when there is a conductive foreign object or liquid inside the TYPE C port, the signal given to the Liquid_DET ADC2 of the control module 10 is a high level, and the high level signal is used as a foreign object signal. Figure 6 As shown in (B), when there is a conductive foreign object or liquid inside the TYPE C port, the second transistor Q2 is turned on, and the Li qu i d_DET IO1 signal given to the control module 10 is a low level, and the low level signal is used as a foreign object signal.

[0136] In some possible implementations, reference Figure 7 , Figure 7 The structure diagram of the shutdown protection module in the foreign object detection circuit provided in an embodiment of the present application is as follows. The foreign object detection circuit further includes: a shutdown protection module 50, and the shutdown protection module 50 includes:

[0137] A sixth diode D6, a first end of the sixth diode D6 is connected to the first protection pin CC1 of the female socket interface T1;

[0138] A seventh diode D7, wherein a first end of the seventh diode D7 is connected to the second protection pin CC2 of the female socket interface T1, and a second end of the seventh diode D7 is connected to the second end of the sixth diode D6;

[0139] A sixteenth resistor R16 , wherein a first end of the sixteenth resistor R16 is connected to a second end of the sixth diode R16 , and a second end of the sixteenth resistor R16 is connected to the control module 10 .

[0140] In this embodiment, the control module 10 sends the EN_Protect1 signal through the sixteenth resistor R16, the sixth diode D6 and the seventh diode D7, and respectively to the first protection pin CC1 and the second protection pin CC2 of the TYPE C terminal. If the external TYPE C charging device detects that the CC pin is abnormal, the TYPE C device turns off the output of the power supply pin VBUS, thereby providing absolute protection. It should be noted that not only the TYPE C charging device is protected, but also the device that can be charged externally by the other party's TYPE C port is protected.

[0141] Exemplarily, when foreign matter or liquid is detected in TYPE C, the control module 10 turns off the external power supply of VBUS and the voltages of CC1 and CC2, thereby stopping all electrical signals in the TYPE C port, thereby protecting the device itself and external devices.

[0142] In some possible implementations, reference Figure 8 , Figure 8This is a structural diagram of a hiccup protection module in a foreign object detection circuit provided in an embodiment of the present application. The foreign object detection circuit further includes: a hiccup protection module 60. The hiccup protection module 60 includes:

[0143] Field effect tube K1, the control end of the field effect tube K1 is connected to the control module 10, the first end of the field effect tube K1 is connected to the power supply pin VBUS of the female socket interface T1, and the second end of the field effect tube K1 is grounded.

[0144] In this embodiment, since the charging device is not necessarily a Type C adapter, it may also be a Type A adapter that powers the device through a Type A to Type C cable. Therefore, the control module 10 outputs EN_Protect2 high level and drives the field effect tube K1 to conduct, realizing overcurrent protection of the adapter, so that the adapter works in hiccup mode. Although it cannot completely block the corrosion caused by the ionization reaction and present a micro short circuit between VBUS and GND, it at least avoids the situation where the continuous VBUS voltage causes the Type C port to be overheated and causes the plastic near the Type C port to burn and deform. In practical applications, a power MOS tube of about 10mΩ can be selected to keep the temperature of the Type C terminal below 80℃.

[0145] In some possible implementations, reference Fig. 9 , Fig. 9 This is a schematic diagram of the structure of a reminder module in a foreign object detection circuit provided in an embodiment of the present application, wherein the reminder module 30 includes:

[0146] A voice prompt unit 31, wherein the voice prompt unit 31 is connected to the control module 10;

[0147] A display prompting unit 32, wherein the display prompting unit 32 is connected to the control module 10;

[0148] The antenna unit 33 is connected to the control module 10 .

[0149] In this embodiment, the voice prompt unit 31 is specifically a speaker for outputting voice prompt information, and the display prompt unit 32 is specifically a screen for outputting visual prompt information, thereby prompting the user that there is a foreign object in the port, or transmitting a wireless prompt signal to a connected terminal device, such as a user's mobile phone or other electronic device, through the antenna unit 33, so that when the user is not near the device, he can also obtain the prompt information and take protective measures to avoid the continued occurrence of the fault.

[0150] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0151] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0152] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a computer storage medium (such as Flash memory, ROM / RAM, disk, CD), including several instructions for enabling a controller in a terminal device (which can be a mobile phone, computer, server, or network device, etc.) for controlling the storage medium to perform data read and write operations to execute the methods described in each embodiment of the present application.

[0153] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A foreign body detection circuit, characterized in that: The foreign body detection circuit comprises: A foreign object detection module, the foreign object detection module is connected to the female socket interface, and is used to output a foreign object signal when a foreign object is detected in the female socket interface; A control module, the control module is connected to the foreign object detection module, and the control module is used to receive the foreign object signal and output a foreign object warning signal; A reminder module is connected to the control module and is used to receive the foreign object reminder signal and output alarm information.

2. The foreign body detection circuit according to claim 1, characterized in that: The foreign body detection circuit comprises: a power supply module, and the power supply module comprises: A first diode, wherein a first end of the first diode is connected to a power supply pin of the female socket interface; a second diode, wherein a first end of the second diode is connected to a system power supply end, and a second end of the second diode is respectively connected to a second end of the first diode and a foreign object detection module; A first capacitor, wherein a first end of the first capacitor is connected to a second end of the second diode, and a second end of the first capacitor is grounded.

3. The foreign body detection circuit according to claim 2, characterized in that: The foreign body detection module includes: a first detection module, the first detection module includes: a third diode, a first end of the third diode being connected to the control module; a first resistor, wherein a first end of the first resistor is connected to a second end of the third diode; A first comparator, wherein a first input end of the first comparator is respectively connected to the second end of the first resistor and the power supply pin of the female socket interface, an output end of the first comparator is connected to the control module, and a power supply end of the first comparator is connected to a first end of the first capacitor; a second resistor, wherein a first end of the second resistor is connected to the control module, and a second end of the second resistor is connected to the second input end of the first comparator; a third resistor, a first end of the third resistor being connected to a second end of the second resistor, and a second end of the third resistor being grounded; A fourth resistor, wherein a first end of the fourth resistor is connected to the output end of the first comparator, and a second end of the fourth resistor is connected to the system power supply end.

4. The foreign body detection circuit according to claim 2, characterized in that: The foreign body detection module includes: a second detection module, and the second detection module includes: a fifth resistor, wherein a first end and a second end of the fifth resistor are connected to the control module; a fourth diode, wherein a first end of the fourth diode is connected to a power supply pin of the female socket interface, and a second end of the fourth diode is connected to the control module; Alternatively, the foreign body detection module includes: a third detection module, and the third detection module includes: a sixth resistor, wherein a first end of the sixth resistor is connected to the system power supply end, and a second end of the sixth resistor is connected to the control module; a seventh resistor, a first end of the seventh resistor being connected to the control module; A first transistor, wherein the control end of the first transistor is connected to the second end of the seventh resistor, the first end of the first transistor is connected to the second end of the sixth resistor, and the second end of the first transistor is grounded.

5. The foreign body detection circuit according to claim 2, characterized in that: The foreign body detection circuit also includes: An eighth resistor, a first end of the eighth resistor is connected to the first communication end of the female socket interface, and a second end of the eighth resistor is connected to the foreign object detection module; A ninth resistor, wherein a first end of the ninth resistor is connected to the second communication end of the female socket interface, and a second end of the ninth resistor is connected to the foreign object detection module.

6. The foreign body detection circuit according to claim 5, characterized in that: The foreign body detection module includes: a fourth detection module, and the fourth detection module includes: a tenth resistor, a first end of the tenth resistor being connected to the first end of the first capacitor; an eleventh resistor, a first end of the eleventh resistor being connected to a second end of the tenth resistor, and a second end of the eleventh resistor being grounded; a second comparator, wherein a first input terminal of the second comparator is connected to the second terminal of the tenth resistor, a second input terminal of the second comparator is respectively connected to the second terminal of the eighth resistor and the second terminal of the ninth resistor, an output terminal of the second comparator is connected to the control module, and a power supply terminal of the second comparator is connected to the first terminal of the first capacitor; a twelfth resistor, a first end of the twelfth resistor being connected to the second input end of the second comparator, and a second end of the twelfth resistor being grounded; A second capacitor, wherein a first end of the second capacitor is connected to the first end of the eleventh resistor, and a second end of the second capacitor is grounded.

7. The foreign body detection circuit according to claim 5, characterized in that: The foreign body detection module includes: a fifth detection module, and the fifth detection module includes: a thirteenth resistor, a first end of the thirteenth resistor being connected to the second end of the eighth resistor and the second end of the ninth resistor respectively, and a second end of the thirteenth resistor being grounded; a third capacitor, a first end of the third capacitor being connected to the first end of the thirteenth resistor, and a second end of the third capacitor being grounded; a fifth diode, a first end of the fifth diode being connected to the first end of the thirteenth resistor, and a second end of the fifth diode being grounded; Alternatively, the foreign body detection module includes: a sixth detection module, and the sixth detection module includes: a fourteenth resistor, a first end of the fourteenth resistor being connected to the system power supply end, and a second end of the fourteenth resistor being connected to the control module; a second triode, wherein a control end of the second triode is respectively connected to the second end of the eighth resistor and the second end of the ninth resistor, a first end of the second triode is connected to the second end of the fourteenth resistor, and a second end of the second triode is grounded; a fifteenth resistor, a first end of the fifteenth resistor being connected to the control end of the second transistor, and a second end of the fifteenth resistor being grounded; A fourth capacitor, wherein a first end of the fourth capacitor is connected to the first end of the fifteenth resistor, and a second end of the fourth capacitor is grounded.

8. The foreign body detection circuit according to claim 1, characterized in that: The foreign body detection circuit further includes: a shutdown protection module, the shutdown protection module including: A sixth diode, a first end of the sixth diode being connected to the first protection pin of the female socket interface; a seventh diode, wherein a first end of the seventh diode is connected to the second protection pin of the female socket interface, and a second end of the seventh diode is connected to the second end of the sixth diode; A sixteenth resistor, wherein a first end of the sixteenth resistor is connected to the second end of the sixth diode, and a second end of the sixteenth resistor is connected to the control module.

9. The foreign body detection circuit according to claim 1, characterized in that: The foreign object detection circuit further includes: a hiccup protection module, the hiccup protection module including: A field effect tube, wherein the control end of the field effect tube is connected to the control module, the first end of the field effect tube is connected to the power supply pin of the female socket interface, and the second end of the field effect tube is grounded.

10. The foreign body detection circuit according to claim 1, characterized in that: The reminder module comprises: A voice prompt unit, the voice prompt unit is connected to the control module; A display prompt unit, the display prompt unit is connected to the control module; An antenna unit is connected to the control module.

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