Type-c insertion direction detection circuit, circuit board, and electronic device

Abstract

The application provides a Type-C insertion direction detection circuit, a circuit board and electronic equipment, and relates to the technical field of detection circuits, wherein the detection circuit is applied to electronic equipment, the electronic equipment comprises a Type-C socket, and the detection circuit comprises a switch module; an input end of the switch module is used for being connected with a VBUS end of the Type-C socket; the input end of the switch module is connected with a first CC end and / or a second CC end of the Type-C socket; the switch module is used for changing a conduction state according to a first level input by the first CC end and / or the second CC end at the input end; a second level is output at a driving end of the switch module, so that the electronic equipment determines a plug connection relationship between a Type-C plug and the Type-C socket according to the second level. The application can detect the insertion direction of the Type-C plug through electronic components in the switch module, effectively reduces the circuit cost and improves the reliability of the circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection circuit, in particular to a Type-C insertion direction detection circuit, a circuit board and an electronic device. BACKGROUND

[0002] The prior art uses a dedicated Type-C insertion direction detection chip to detect the Type-C insertion direction, but this chip detection method is high in cost, and the chip controlled by software may cause instability in long-term use, affecting the detection of the Type-C insertion direction. SUMMARY

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The present application provides a Type-C insertion direction detection circuit, a circuit board and an electronic device, which can detect the insertion direction of a Type-C plug through electronic components in a switch module, effectively reducing the circuit cost and improving the reliability of the circuit.

[0005] In a first aspect, the present application provides a Type-C insertion direction detection circuit applied to an electronic device, wherein the electronic device comprises a Type-C socket, and the detection circuit comprises:

[0006] a switch module, an input end of the switch module being configured to be connected with a VBUS end of the Type-C socket, the input end of the switch module being connected with a first CC end and / or a second CC end of the Type-C socket, the switch module being configured to change the conduction state according to a first voltage level input by the first CC end and / or the second CC end at the input end, and output a second voltage level at a driving end of the switch module, so that the electronic device determines the connection relationship between a Type-C plug and the Type-C socket according to the second voltage level.

[0007] In a second aspect, the present application further provides a circuit board comprising the detection circuit according to any one of the first aspect.

[0008] In a third aspect, the present application further provides an electronic device comprising the circuit board according to any one of the second aspect.

[0009] The embodiment of the application comprises: a switch module is connected with a Type-C socket, specifically, an input end of the switch module is connected with a VBUS end of the Type-C socket to provide a control end of the switch module for output, and a first CC end and / or a second CC end of the Type-C socket is connected with the control end of the switch module, an output end of the switch module is a driving end, the VBUS end is used as an input end, and a voltage guarantee is provided for an output level of the output end, the switch module changes a conduction state thereof according to a level of the first CC end and / or the second CC end through internal electronic components, so as to change a current flow situation from the input end to the output end, and the driving end is used for feeding back a plug-in relationship of a Type-C plug and the Type-C socket, that is, feeding back whether the Type-C plug is inserted in an A face or a B face, the application can detect an insertion direction of the Type-C plug through the electronic components in the switch module, and effectively reduces a circuit cost and improves a circuit reliability.

[0010] Additional features and advantages of the application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the description and claims. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings are included to provide a further understanding of the technical scheme of the application, and constitute a part of the specification, and are used together with the embodiments of the application to explain the technical scheme of the application, and do not constitute a limitation on the technical scheme of the application.

[0012] Figure 1 is a circuit diagram of a Type-C insertion direction detection circuit of an embodiment of the application;

[0013] Figure 2 is a circuit diagram of a Type-C insertion direction detection circuit of another embodiment of the application;

[0014] Figure 3 is a circuit diagram of a Type-C insertion direction detection circuit of another embodiment of the application;

[0015] Figure 4 is a schematic diagram of a circuit board of an embodiment of the application;

[0016] Figure 5 is a schematic diagram of an electronic device of an embodiment of the application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0018] It should be noted that although the functional modules are divided in the device schematic diagram, and the logical sequence is shown in the flowchart, in some cases, the steps shown or described can be performed in a manner different from the module division in the device or the sequence in the flowchart. The terms "first", "second", etc. in the specification, claims or above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0019] It should also be understood that the reference "one embodiment" or "some embodiments" and the like described in the embodiment description of the present application means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like appearing in different parts of the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0020] In recent years, most devices use Type-C as the interface type of electronic devices, which is a new universal serial bus hardware interface form, which has emerged with the latest USB3.1 standard. Type-C is a new interface developed by USB standardization organization to solve the problems of non-uniform physical interface specification and one-way power transmission of USB interface for a long time. Its biggest feature is that the upper and lower ends are completely consistent, supporting two-way insertion, and compared with Micro-USB, users no longer need to distinguish the front and back of USB. And it integrates charging, display, data transmission and other functions. Due to its excellent performance, it has been widely used in the field of electronic devices, and almost all new generation mobile communication devices support TYPE-C interface. The prior art uses a dedicated Type-C insertion direction detection chip to detect the Type-C insertion direction, that is, through program detection whether the CC pin on the socket is connected with the CC1 pin in the plug or the CC2 pin in the plug, to judge whether the Type-C plug is inserted in A face or B face, so as to control the switching position of USB3.0. But this way uses a chip to control by software, which may cause instability in long-term use, affecting the detection of Type-C insertion direction.

[0021] The embodiments of the present application are further described below with reference to the drawings.

[0022] In a first aspect, the present application provides a Type-C insertion direction detection circuit applied to an electronic device, the detection circuit comprising: a switch module, an input end of the switch module being configured to be connected with a VBUS end of a Type-C socket, the input end of the switch module being connected with a first CC end and / or a second CC end of the Type-C socket, the switch module being configured to change a conduction state according to a first voltage level input by the first CC end and / or the second CC end at the input end, and output a second voltage level at a driving end of the switch module, so that the electronic device determines a plug-in relationship between a Type-C plug and the Type-C socket according to the second voltage level. The switch module is connected with the Type-C socket, the VBUS end is used as the input end, and the voltage level output by the output end is guaranteed. The switch module changes the conduction state according to the voltage level of the first CC end and / or the second CC end by using internal electronic components, so as to change the current flow from the input end to the output end. The driving end is used to feedback the plug-in relationship between the Type-C plug and the Type-C socket, i.e., feedback whether the Type-C plug is inserted from an A surface or a B surface. The present application can detect the insertion direction of the Type-C plug by using the electronic components in the switch module, effectively reduces the circuit cost, and improves the reliability of the circuit.

[0023] Reference Figure 1In one embodiment, when the electronic device is a Device device, i.e., a driving device, wherein the first CC end of the Type-C socket is grounded through the first resistor R1, the switch module comprises a first switch tube Q1, the input end of the first switch tube Q1 is connected with the VBUS end, the control end of the first switch tube Q1 is connected with the second CC end, and the output end of the first switch tube Q1 is grounded; the detection circuit further comprises a delay filter circuit, the input end of the delay filter circuit is connected between the input end of the first switch tube Q1 and the VBUS end, and the output end of the delay filter circuit is a driving end. In the circuit provided in the embodiment, when the A face of the Type-C plug is inserted into the Type-C socket, the USB_VBUS end is at a high level, the USB_CC1 is at a high level, and the USB_CC2 is at a low level, so that the first switch tube Q1 is not turned on, and the driving end USB_DI R is at a high level; when the B face of the Type-C plug is inserted into the Type-C socket, the USB_VBUS end is at a high level, the USB_CC1 is at a low level, and the USB_CC2 is at a high level, so that the first switch tube Q1 is turned on, and then the current flows from the USB_VBUS to the ground end through Q1 directly without passing through the delay filter circuit, and the driving end USB_DI R is at a low level. That is, in the embodiment, when it is detected that the level at the USB_DI R is at a high level, it is indicated that the insertion direction of the Type-C is the A face insertion, and when it is detected that the USB_DI R is at a low level, it is indicated that the insertion direction of the Type-C is the B face insertion. Meanwhile, in one embodiment, the first resistor R1 is 5.1kΩ, which is not limited in the present application.

[0024] It should be noted that the Device device can be a memory device, such as a U disk, an MP3 electronic device, a hard disk, etc.

[0025] Continuing to refer to Figure 1 , the second resistor R2 is provided between the input end of the first switch tube Q1 and the VBUS end, and the second resistor R2 is a pull-up resistor, so that the input end of the first switch tube Q1 is kept at a high level, and the stability of the detection circuit is improved. In one embodiment, the second resistor R2 is 47kΩ, which is not limited in the present application.

[0026] Referring to Figure 2 , the switch module further comprises a second switch tube Q2, the second switch tube Q2 is provided between the input end of the first switch tube Q1 and the delay filter circuit, the input end of the second switch tube Q2 is connected with the VBUS end through a third resistor R3, the control end of the second switch tube Q2 is connected between the input end of the first switch tube Q1 and the second resistor R2, the output end of the second switch tube Q2 is grounded, and the input end of the delay filter circuit is connected between the input end of the second switch tube Q2 and the third resistor R3. In order to synchronize the level of the driving end USB_DI R with the level of the second CC end USB_CC2, the control end of the second switch tube Q2 is connected between the input end of the first switch tube Q1 and the second resistor R2. Figure 2In the circuit diagram, a second switch Q2 was added, which serves as a logic inversion device. Specifically, when the Type-C plug (side A) is inserted into the Type-C socket, the USB_VBUS terminal is high, USB_CC1 is high, and USB_CC2 is low. Therefore, the first switch Q1 is not turned on, making the control terminal of the second switch Q2 high, and thus turning on the second switch Q2. Consequently, the driver terminal USB_DI R is low. When the Type-C plug (side B) is inserted into the Type-C socket, the USB_VBUS terminal is high, USB_CC1 is low, and USB_CC2 is high. At this time, the first switch Q1 is turned on, and the second switch Q2 is not turned on. Therefore, USB_DI R is high, and the logic inversion is achieved through the second switch Q2. Figure 2 The provided circuit diagram synchronizes the voltage level of the driver terminal USB_DI R with the voltage level of the second CC terminal USB_CC2. The third resistor R3 and the second resistor R2 both act as pull-up resistors, keeping the input potentials of the first switch Q1 and the second switch Q2 at a high level, respectively, thus improving the stability of the detection circuit. In one embodiment, the third resistor R3 is 47kΩ, but this application does not limit its application to this value.

[0027] Continue to refer to Figure 2 The delay filter circuit includes a fourth resistor R4 and a first capacitor C1. One end of the fourth resistor R4 is connected to one end of the second capacitor C2, and the other end of the fourth resistor R4 is connected between the input terminal of the second switch Q2 and the third resistor R3. The other end of the first capacitor C1 is grounded, and the driving terminal is located between the fourth resistor R4 and the first capacitor C1. This delay filter circuit eliminates interference signals on USB_VBUS and satisfies the power-on and power-off timing of the first switch Q1 and the second switch Q2. In one embodiment, the fourth resistor R4 is 1kΩ and the first capacitor C1 is 10nF; however, this application does not impose any limitations on these values.

[0028] Continue to refer to Figure 2 The detection circuit provided in this application also includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 and one end of the sixth resistor R6 are connected to the control terminal of the first switching transistor Q1. The other end of the fifth resistor R5 is connected to the second CC terminal of the first Type-C socket, and the other end of the sixth resistor R6 is grounded. In this circuit, the fifth resistor R5 acts as a protective resistor to prevent damage to the first switching transistor Q1 due to excessive surface voltage, and also plays a certain voltage division role. The sixth resistor R6 is a pull-down resistor, which improves the stability of the detection circuit.

[0029] It should be noted that the connection positions of the first CC terminal USB_CC1 and the second CC terminal USB_CC2 can be interchanged, and this application does not limit this.

[0030] It should be noted that the first switch tube Q1 and the second switch tube Q2 can be a triode or a field effect tube, in the embodiment of the present application, the first switch tube Q1 and the second switch tube Q2 are NPN type triodes, the input end of the first switch tube Q1 and the second switch tube Q2 is the collector of the NPN type triode, the control end of the first switch tube Q1 and the second switch tube Q2 is the base of the NPN type triode, and the output end of the first switch tube Q1 and the second switch tube Q2 is the emitter of the NPN type triode.

[0031] With reference to Figure 3In another embodiment, when the electronic device is a Host device, the switch module includes a third switch tube Q3 and a fourth switch tube Q4. The input end of the third switch tube Q3 is connected with the VBUS end of the Type-C socket. The control end of the third switch tube Q3 is connected with the first CC end of the Type-C socket and connected with the VBUS end through a first resistance R1 network. The output end of the third switch tube Q3 is connected with the ground through a seventh resistance R7, an eighth resistance R8 and a ninth resistance R9 in sequence. An enable end is arranged between the seventh resistance R7 and the eighth resistance R8. The enable end is used for indicating whether there is a Type-C socket access. Meanwhile, the enable end can also be used for powering the subsequent drive chip. The input end of the fourth switch tube Q4 is connected with the VBUS end of the Type-C socket. The control end of the fourth switch tube Q4 is connected with the second CC end of the Type-C socket and connected with the VBUS end through a second resistance R2 network. The output end of the fourth switch tube Q4 is connected between the eighth resistance R8 and the ninth resistance R9. The drive end is arranged between the eighth resistance R8 and the ninth resistance R9 through a tenth resistance R10. The seventh resistance R7, the eighth resistance R8 and the ninth resistance R9 constitute a series voltage division circuit, so as to be able to affect the drive end level condition when the Type-C plug is inserted into the A surface or the B surface. Specifically, when the Type-C plug is inserted into the Type-C socket in the A surface, the USB_VBUS end is high level. At this time, the first CC end USB_CC1 accesses the pull-down resistance of the CC end in the Type-C plug, so that the USB_CC1 end is low level, thereby making the third switch tube Q3 conduct. Due to the effect of the VBUS end and the second resistance R2 network, the fourth switch tube Q4 does not meet the condition of conduction, so the fourth switch tube Q4 is not conductive. The current flows out from the VBUS end through the output end of the third switch tube Q3, and presents high level at the enable end after passing through the seventh resistance R7. Meanwhile, due to the voltage division circuit formed by the seventh resistance R7, the eighth resistance R8 and the ninth resistance R9, the drive end outputs low level. Similarly, when the Type-C plug is inserted into the Type-C socket in the B surface, the USB_VBUS end is high level. At this time, the second CC end USB_CC2 accesses the pull-down resistance of the CC end in the Type-C plug, so that the USB_CC2 end is low level, thereby making the fourth switch tube Q4 conduct. Due to the effect of the VBUS end and the first resistance R1 network, the third switch tube Q3 does not meet the condition of conduction, so the third switch tube Q3 is not conductive. The current flows out from the VBUS end through the output end of the fourth switch tube Q4, presents high level at the enable end after passing through the eighth resistance R8, and presents high level at the drive end after passing through the tenth resistance R10. That is, when the drive end is low level, it indicates that the Type-C plug is inserted into the Type-C socket in the A surface. When the drive end is high level, it indicates that the Type-C plug is inserted into the Type-C socket in the A surface. When the drive end is low level, it indicates that the Type-C plug is inserted into the Type-C socket in the B surface.The insertion direction of the Type-C plug is detected by the third switch tube Q3 and the fourth switch tube Q4 and a plurality of resistance quotas in a hardware mode, so that the circuit cost is effectively reduced and the reliability of the circuit is improved.

[0032] It should be noted that the Host device can be a computer, a background controller or the like.

[0033] With reference to the foregoing description Figure 3 , the seventh resistance R7 and the enable end are grounded through the second capacitor C2, the driving end is set between the eighth resistance R8 and the ninth resistance R9 through the tenth resistance R10, and the tenth resistance R10 and the driving end are grounded through the third capacitor C3, wherein the circuit composed of the second capacitor C2 and the tenth resistance R10 and the third capacitor C3 plays a filtering role, so that the level of the enable end and the driving end is more stable, and in an embodiment, the second capacitor C2 and the third capacitor C3 can be 0.1 μF, and the tenth resistance R10 can be 1 kΩ, which is not limited in the present application.

[0034] With reference to the foregoing description Figure 3 , the first resistance network includes the eleventh resistance R11, the twelfth resistance R12 and the thirteenth resistance R13, one end of the eleventh resistance R11, the twelfth resistance R12 and the thirteenth resistance R13 is connected to each other, the other end of the eleventh resistance R11 is connected to the VBUS end, the other end of the twelfth resistance R12 is connected to the first CC end, and the other end of the thirteenth resistance R13 is connected to the control end of the third switch tube Q3; the second resistance network includes the fourteenth resistance R14, the fifteenth resistance R15 and the sixteenth resistance R16, one end of the fourteenth resistance R14, the fifteenth resistance R15 and the sixteenth resistance R16 is connected to each other, the other end of the fourteenth resistance R14 is connected to the VBUS end, the other end of the fifteenth resistance R15 is connected to the second CC end, and the other end of the sixteenth resistance R16 is connected to the control end of the fourth switch tube Q4. Specifically, according to the specification of Type-C, the resistance values of the eleventh resistance R11 and the fourteenth resistance R14 are 12 kΩ, the resistance values of the twelfth resistance R12 and the fifteenth resistance R15 are 27 kΩ, and the resistance values of the thirteenth resistance R13 and the sixteenth resistance R16 are 4.7 kΩ. The specific resistance values of the above resistances are not limited in the present application.

[0035] It should be noted that the third switch tube Q3 and the fourth switch tube Q4 can be a triode or a field effect tube, and in the embodiment of the present application, the third switch tube Q3 and the fourth switch tube Q4 are PNP type triodes, the input end of the third switch tube Q3 and the fourth switch tube Q4 is the emitter stage of the PNP type triode, the control end of the third switch tube Q3 and the fourth switch tube Q4 is the base stage of the PNP type triode, and the output end of the third switch tube Q3 and the fourth switch tube Q4 is the collector of the PNP type triode.

[0036] The application also provides a circuit board comprising the Type-C insertion direction detection circuit of any one of the above embodiments.

[0037] In addition, the application also provides an electronic device comprising the circuit board of the above embodiments.

[0038] The above is a specific description of the preferred embodiments of the application, but the application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the application.

Claims

1. A Type-C insertion orientation detection circuit, applied to an electronic device, the electronic device including a Type-C socket, the detection circuit comprising: A switch module, wherein the input terminal of the switch module is connected to the VBUS terminal of the Type-C socket, the input terminal of the switch module is connected to the second CC terminal of the Type-C socket, the switch module is used to change the conduction state according to a first level input from the second CC terminal at the input terminal, and output a second level at the drive terminal of the switch module, so that the electronic device determines the plug-in relationship between the Type-C plug and the Type-C socket according to the second level; The electronic device is a driving device. The first CC terminal is grounded through a first resistor. The switching module includes: a first switching transistor, the input terminal of the first switching transistor is connected to the VBUS terminal, the control terminal of the first switching transistor is connected to the second CC terminal, the output terminal of the first switching transistor is grounded, and the driving terminal is located between the input terminal of the first switching transistor and the VBUS terminal.

2. The detection circuit according to claim 1, characterized in that, The detection circuit further includes a delay filter circuit, the input of which is connected between the input of the first switching transistor and the VBUS terminal, and the output of which is a driving terminal.

3. The detection circuit according to claim 2, characterized in that, A second resistor is provided between the input terminal of the first switching transistor and the VBUS terminal.

4. The detection circuit according to claim 3, characterized in that, The switching module further includes a second switching transistor, which is disposed between the input terminal of the first switching transistor and the delay filter circuit. The input terminal of the second switching transistor is connected to the VBUS terminal through a third resistor. The control terminal of the second switching transistor is connected between the input terminal of the first switching transistor and the second resistor. The output terminal of the second switching transistor is grounded. The input terminal of the delay filter circuit is connected between the input terminal of the second switching transistor and the third resistor.

5. The detection circuit according to claim 4, characterized in that, The delay filter circuit includes a fourth resistor and a first capacitor. One end of the fourth resistor is connected to one end of the first capacitor, and the other end of the fourth resistor is connected between the input terminal of the second switching transistor and the third resistor. The other end of the first capacitor is grounded, and the driving terminal is located between the fourth resistor and the first capacitor.

6. The detection circuit according to claim 5, characterized in that, It also includes a fifth resistor and a sixth resistor. One end of the fifth resistor and one end of the sixth resistor are both connected to the control terminal of the first switching transistor. The other end of the fifth resistor is connected to the second CC terminal of the Type-C socket, and the other end of the sixth resistor is grounded.

7. A Type-C insertion orientation detection circuit, applied to an electronic device, the electronic device including a Type-C socket, the detection circuit comprising: A switch module, wherein the input terminal of the switch module is used to connect to the VBUS terminal of the Type-C socket, the input terminal of the switch module is connected to the first CC terminal and the second CC terminal of the Type-C socket, the switch module is used to change the conduction state according to the first level input to the first CC terminal and the second CC terminal received at the input terminal, and outputs a second level at the drive terminal of the switch module, so that the electronic device determines the plug-in relationship between the Type-C plug and the Type-C socket according to the second level; The electronic device is the main device, and the switching module includes: The third switch has its input terminal connected to the VBUS terminal of the Type-C socket, its control terminal connected to the first CC terminal of the Type-C socket and connected to the VBUS terminal through a first resistor network, and its output terminal grounded sequentially through a seventh resistor, an eighth resistor and a ninth resistor, with an enable terminal provided between the seventh resistor and the eighth resistor. The fourth switch has its input terminal connected to the VBUS terminal of the Type-C socket, its control terminal connected to the second CC terminal of the Type-C socket and connected to the VBUS terminal through a second resistor network, and its output terminal connected between the eighth resistor and the ninth resistor. The driving terminal is located between the eighth resistor and the ninth resistor.

8. The detection circuit according to claim 7, characterized in that, The seventh resistor and the enable terminal are grounded through the second capacitor, the drive terminal is connected between the eighth resistor and the ninth resistor through the tenth resistor, and the tenth resistor and the drive terminal are grounded through the third capacitor.

9. The detection circuit according to claim 8, characterized in that, The first resistor network includes an eleventh resistor, a twelfth resistor, and a thirteenth resistor. One end of the eleventh, twelfth, and thirteenth resistors is connected to each other. The other end of the eleventh resistor is connected to the VBUS terminal. The other end of the twelfth resistor is connected to the first CC terminal. The other end of the thirteenth resistor is connected to the control terminal of the third switch. The second resistor network includes a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor. One end of the fourteenth, fifteenth, and sixteenth resistors is connected to each other. The other end of the fourteenth resistor is connected to the VBUS terminal. The other end of the fifteenth resistor is connected to the second CC terminal. The other end of the sixteenth resistor is connected to the control terminal of the fourth switch.

10. A circuit board, characterized in that, Includes the detection circuit as described in any one of claims 1 to 9.

11. An electronic device, characterized in that, Including the circuit board as described in claim 10.

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