Charging interface short circuit detection circuit, charging wire and charger

Abstract

The invention provides a charging interface short circuit detection circuit, a charging wire and a charger. The charging interface short circuit detection circuit comprises N detection units, the input end of the ith detection unit is connected to the ith target line in the charging lines, the ith target line is the line, connected with the ith target pin in the charging interface, in the charging lines, and i is larger than or equal to 1 and smaller than or equal to N; and the detection unit is used for carrying out short circuit prompt when the ith target pin is short-circuited. The condition of pin short circuit in the charging interface can be timely and effectively identified, a consumer is timely reminded when short circuit occurs, and greater damage to an equipment mainboard caused by pin short circuit is avoided.

Description

Technical Field

[0001] The present invention relates to the field of circuits, and in particular to a charging interface short-circuit detection circuit, a charging cable and a charger. Background Art

[0002] The Type-C interface has the advantage of not needing to distinguish between the front and back plugs and is highly versatile. Now more and more electronic devices are using the Type-C interface as the charging interface. The Type-C interface has a total of 24 pins, and the pins are densely packed, so the pins are very close to each other. Since the charging interface needs to be frequently plugged in and out, short circuits may occur between the pins.

[0003] When a short circuit occurs between pins in the Type-C interface, it may cause danger to the load device at the back end and may even cause the device to burn out. Summary of the invention

[0004] An object of the present invention is to provide a charging port short circuit detection circuit, a charging cable and a charger to at least partially improve the above-mentioned problem.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a charging interface short circuit detection circuit, wherein the charging interface short circuit detection circuit includes N detection units;

[0007] The input end of the i-th detection unit is connected to the i-th target line in the charging line, wherein the i-th target line is a line in the charging line connected to the i-th target pin in the charging interface, 1≤i≤N;

[0008] The detection unit is used to provide a short circuit prompt when a short circuit occurs on the i-th target pin.

[0009] Optionally, the detection unit includes a comparator, a first resistor and a prompter;

[0010] The non-inverting input terminal of the comparator serves as the input terminal of the detection unit, and the inverting input terminal of the comparator is connected to a reference power supply;

[0011] The positive power terminal of the comparator is connected to the driving voltage, the negative power terminal of the comparator is grounded, one end of the first resistor is connected to the positive power terminal of the comparator, the other end of the first resistor is connected to the output terminal of the comparator, the output terminal of the comparator is connected to the first end of the prompter, and the second end of the prompter is grounded.

[0012] Optionally, the indicator uses a light emitting diode, the anode of the light emitting diode serves as the first end of the indicator, and the cathode of the light emitting diode serves as the second end of the indicator.

[0013] Optionally, the detection unit further includes a second resistor, one end of the second resistor is connected to the output end of the comparator, and the other end of the second resistor is connected to the first end of the prompter.

[0014] Optionally, the detection unit further includes a first capacitor, one electrode of the first capacitor is connected to the inverting input terminal of the comparator, and the other electrode of the first capacitor is grounded.

[0015] Optionally, the charging interface short circuit detection circuit further includes a protection unit, the protection unit includes M switch tubes and a trigger, the trigger is provided with N input terminals, the mth switch tube is provided in the mth power supply line in the charging line, the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M;

[0016] The i-th input terminal of the trigger is connected to the i-th target line, and the output terminal of the trigger is connected to the control terminals of the M switch tubes respectively;

[0017] The trigger is used to control the M switch tubes to switch to an off state when a short circuit occurs on the i-th target pin.

[0018] Optionally, the charging interface short circuit detection circuit further includes a protection unit, the protection unit includes M switch tubes and a trigger, the trigger is provided with N input terminals and M output terminals, the mth switch tube is provided in the mth power supply line in the charging line, the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M;

[0019] The i-th input terminal of the trigger is connected to the i-th target line, and the m-th output terminal of the trigger is connected to the control terminal of the m-th switch tube;

[0020] The trigger is used to control the target switch tube to switch to a disconnected state when a short circuit occurs on the i-th target pin;

[0021] Among them, the target switch tube is a switch tube set in the target power supply circuit, the target power supply circuit is a power supply circuit connected to the target power supply pin, and the target power supply pin is the power supply pin in the charging interface that is closest to the i-th target pin.

[0022] Optionally, the charging interface short-circuit detection circuit further includes a circuit breaker unit, and the circuit breaker unit is arranged on the charging line;

[0023] The disconnecting unit is used to cut off the power supply line in the charging cable when receiving a user instruction.

[0024] In a second aspect, an embodiment of the present invention provides a charging cable, wherein the charging cable includes the above-mentioned charging port short-circuit detection circuit.

[0025] In a third aspect, an embodiment of the present invention provides a charger, comprising a charging head, a charging interface and the above-mentioned charging cable, wherein one end of the charging cable is connected to the charging head, and the other end of the charging cable is connected to the charging interface.

[0026] Compared with the prior art, the embodiment of the present invention provides a charging interface short circuit detection circuit, a charging cable and a charger, wherein the charging interface short circuit detection circuit includes N detection units; the input end of the i-th detection unit is connected to the i-th target line in the charging cable, wherein the i-th target line is the line in the charging cable connected to the i-th target pin in the charging interface, 1≤i≤N; the detection unit is used to give a short circuit prompt when a short circuit occurs in the i-th target pin. The short circuit of the pin in the charging interface can be identified in a timely and effective manner, and consumers can be reminded in a timely manner when a short circuit occurs, so as to avoid greater damage to the device motherboard due to the pin short circuit.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is one of the structural schematic diagrams of the detection unit provided in the embodiment of the present invention.

[0030] Figure 2 The second structural schematic diagram of the detection unit provided in the embodiment of the present invention.

[0031] Figure 3 A schematic diagram of the structure of a protection unit provided in an embodiment of the present invention.

[0032] In the figure: 20 - charging head; 30 - charging interface; 110 - detection unit; 111 - reminder; 120 - protection unit; 121 - trigger. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device 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 device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] The Type-C interface has a total of 24 pins, and the pins are numerous and dense, so the pins are very close to each other. Since the charging interface needs to be plugged in and out frequently, short circuits between pins are prone to occur during long-term use, especially the short circuits between the 9V, 12V, and 20V power supply pins (VBUS) and the surrounding pins are very likely to damage the CPU of the rear-end load device, thereby causing the entire motherboard to be scrapped. In order to overcome this problem, an embodiment of the present invention provides a charging interface short circuit detection circuit, which can timely and effectively identify the short circuit of the pins in the charging interface, and promptly remind consumers when a short circuit occurs. At the same time, when a short circuit occurs, there is also a corresponding protection circuit to prevent greater damage to the device motherboard due to the short circuit of the pins.

[0041] The charging interface short circuit detection circuit provided in the embodiment of the present invention includes N such Figure 1 The detection unit 110 is shown. Figure 1 This is one of the structural schematic diagrams of the detection unit provided in the embodiment of the present invention. Wherein, N is an integer greater than or equal to 1.

[0042] An input end of the i-th detection unit 110 is connected to the i-th target line in the charging line, wherein the i-th target line is a line in the charging line connected to the i-th target pin in the charging interface, 1≤i≤N.

[0043] The detection unit 110 is used to issue a short circuit prompt when a short circuit occurs on the i-th target pin.

[0044] Optionally, different detection units 110 may have different short circuit prompts, thereby preventing the staff from determining the faulty pin based on the short circuit prompt, thereby facilitating maintenance.

[0045] Among them, the charging interface is a USB Type-C interface, and the target pins include the first auxiliary signal pin (Side Band Use 1, referred to as SBU1), the second auxiliary signal pin (Side Band Use 2, referred to as SBU2), the first handshake pin (Configuration Channel 1, referred to as CC1) and the second handshake pin (Configuration Channel 2, referred to as CC2). The USB Type-C interface is a new, reversible USB connector specification that supports multiple functions, including power transmission, data transmission, and high-definition video output.

[0046] The auxiliary signal pin is an auxiliary signal in the USB Type-C interface. The handshake pin is an important pin used for configuration and detection in the USB Type-C interface. Specifically, it configures VCONN (Voltage Connector) to provide power to the active cable; detects the connection status of the USB port, such as distinguishing whether the DFP (Downstream Facing Port) is connected to the UFP (Upstream Facing Port).

[0047] Optionally, the target pins are all adjacent pins of the power supply pins.

[0048] Please continue to refer to Figure 1 The detection unit 110 includes a comparator U1 , a first resistor R1 and a prompter 111 .

[0049] The non-inverting input terminal of the comparator U1 serves as the input terminal of the detection unit 110 , and the inverting input terminal of the comparator U1 is connected to a reference power supply (Vref).

[0050] The positive power terminal of the comparator U1 is connected to the driving voltage (VDD), the negative power terminal of the comparator U1 is grounded, one end of the first resistor R1 is connected to the positive power terminal of the comparator U1, the other end of the first resistor R1 is connected to the output terminal of the comparator U1, the output terminal of the comparator U1 is connected to the first end of the prompter 111, and the second end of the prompter 111 is grounded.

[0051] When the i-th target pin is short-circuited with the power supply pin in the charging interface, the i-th target line is pulled up to the output voltage of the power supply pin (for example, 9V, 12V and 20V), so that the voltage connected to the in-phase input terminal of the comparator U1 in the i-th detection unit 110 is higher than the reference power supply (Vref), so that the comparator U1 outputs a high level and drives the indicator 111 to issue a short circuit prompt.

[0052] Optionally, the prompter 111 adopts a light emitting diode or a phoenix alarm.

[0053] When the indicator 111 is a light emitting diode, the anode of the light emitting diode serves as the first end of the indicator 111 , and the cathode of the light emitting diode serves as the second end of the indicator 111 .

[0054] Optionally, the light emitting diodes in different detection units 110 emit different colors.

[0055] It should be noted that when no short circuit occurs, the prompter 111 will not issue a short circuit prompt.

[0056] Please refer to Figure 2 , Figure 2 The second structural diagram of the detection unit provided in the embodiment of the present invention. The detection unit 110 further includes a second resistor R2, a first capacitor C1 and a first diode D1.

[0057] One end of the second resistor R2 is connected to the output end of the comparator U1, and the other end of the second resistor R2 is connected to the first end of the indicator 111. The second resistor R2 has a current limiting protection function.

[0058] One electrode of the first capacitor C1 is connected to the inverting input terminal of the comparator U1, and the other electrode of the first capacitor C1 is grounded. The first capacitor C1 is used as a filter capacitor to filter out fluctuations of the reference voltage.

[0059] The anode of the first diode D1 is used as the input terminal of the detection unit 110, and the cathode of the first diode D1 is connected to the non-inverting input terminal of the comparator U1. The first diode D1 is used to prevent current from flowing back into the corresponding circuit.

[0060] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a protection unit provided in an embodiment of the present invention. The charging interface short circuit detection circuit also includes a protection unit 120, which includes M switch tubes and a trigger 121. The trigger 121 is provided with N input terminals, and the mth switch tube Qm is provided in the mth power supply line in the charging line, and the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M. When the mth switch tube Qm is switched to an open circuit, the mth power supply line is in an open circuit state, that is, the mth power supply pin in the charging interface is in an open circuit state and no longer supplies power.

[0061] The i-th input terminal of the trigger 121 is connected to the i-th target line, and the output terminal of the trigger 121 is respectively connected to the control terminals of the M switch tubes.

[0062] The trigger 121 is used to control the M switches to be switched to an off state when a short circuit occurs on the i-th target pin.

[0063] Optionally, the charging interface short circuit detection circuit also includes a protection unit 120, the protection unit 120 includes M switching tubes and a trigger 121, the trigger 121 is provided with N input terminals and M output terminals, the mth switching tube Qm is arranged in the mth power supply line in the charging line, the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M.

[0064] The i-th input terminal of the trigger 121 is connected to the i-th target line, and the m-th output terminal of the trigger 121 is connected to the control terminal of the m-th switch tube Qm.

[0065] The trigger 121 is used to control the target switch tube to switch to the disconnected state when a short circuit occurs on the i-th target pin.

[0066] Among them, the target switch tube is a switch tube set in the target power supply circuit, the target power supply circuit is a power supply circuit connected to the target power supply pin, and the target power supply pin is the power supply pin closest to the i-th target pin in the charging interface.

[0067] The switch tube in the present invention can be but is not limited to a PMOS tube, the gate of the PMOS tube serves as the control end of the switch tube, the source of the PMOS tube serves as the input end of the switch tube (connected to the charging head 20), and the drain of the PMOS tube serves as the output end of the switch tube (connected to the power supply pin in the charging interface 30).

[0068] In an optional implementation, the charging interface short circuit detection circuit further includes a circuit breaker unit, and the circuit breaker unit is disposed on the charging line.

[0069] The circuit breaker unit is used to cut off the power supply line in the charging cable when receiving a user instruction.

[0070] When the user observes a short circuit prompt, the user can use a manual key switch to output a user instruction and cut off the power supply line in the charging cable through the circuit breaker unit. The circuit breaker unit can be, but is not limited to, a manual switch.

[0071] An embodiment of the present invention further provides a charging cable, which includes the above-mentioned charging interface short-circuit detection circuit.

[0072] An embodiment of the present invention further provides a charger, which includes a charging head, a charging interface and the above-mentioned charging cable, wherein one end of the charging cable is connected to the charging head, and the other end of the charging cable is connected to the charging interface.

[0073] In summary, the embodiment of the present invention provides a charging interface short circuit detection circuit, a charging cable and a charger, wherein the charging interface short circuit detection circuit includes N detection units; the input end of the i-th detection unit is connected to the i-th target line in the charging cable, wherein the i-th target line is the line in the charging cable connected to the i-th target pin in the charging interface, 1≤i≤N; the detection unit is used to give a short circuit prompt when a short circuit occurs in the i-th target pin. The short circuit of the pin in the charging interface can be identified in a timely and effective manner, and consumers can be reminded in a timely manner when a short circuit occurs, so as to avoid greater damage to the device motherboard due to the pin short circuit.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0075] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A charging interface short circuit detection circuit, characterized in that: The charging interface short circuit detection circuit includes N detection units; The input end of the i-th detection unit is connected to the i-th target line in the charging line, wherein the i-th target line is a line in the charging line connected to the i-th target pin in the charging interface, 1≤i≤N; The detection unit is used to provide a short circuit prompt when a short circuit occurs on the i-th target pin.

2. The charging port short circuit detection circuit according to claim 1, characterized in that: The detection unit includes a comparator, a first resistor and a prompter; The non-inverting input terminal of the comparator serves as the input terminal of the detection unit, and the inverting input terminal of the comparator is connected to a reference power supply; The positive power terminal of the comparator is connected to the driving voltage, the negative power terminal of the comparator is grounded, one end of the first resistor is connected to the positive power terminal of the comparator, the other end of the first resistor is connected to the output terminal of the comparator, the output terminal of the comparator is connected to the first end of the prompter, and the second end of the prompter is grounded.

3. The charging port short circuit detection circuit according to claim 2, characterized in that: The prompter adopts a light emitting diode, the positive electrode of the light emitting diode serves as the first end of the prompter, and the negative electrode of the light emitting diode serves as the second end of the prompter.

4. The charging port short circuit detection circuit according to claim 2, characterized in that: The detection unit further includes a second resistor, one end of the second resistor is connected to the output end of the comparator, and the other end of the second resistor is connected to the first end of the prompter.

5. The charging port short circuit detection circuit according to claim 2, characterized in that: The detection unit further includes a first capacitor, one electrode of the first capacitor is connected to the inverting input terminal of the comparator, and the other electrode of the first capacitor is grounded.

6. The charging port short circuit detection circuit according to claim 1, characterized in that: The charging interface short circuit detection circuit further includes a protection unit, the protection unit includes M switch tubes and a trigger, the trigger is provided with N input terminals, the mth switch tube is provided in the mth power supply line in the charging line, the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M; The i-th input terminal of the trigger is connected to the i-th target line, and the output terminal of the trigger is connected to the control terminals of the M switch tubes respectively; The trigger is used to control the M switch tubes to switch to an off state when a short circuit occurs on the i-th target pin.

7. The charging port short circuit detection circuit according to claim 1, characterized in that: The charging interface short circuit detection circuit further includes a protection unit, the protection unit includes M switch tubes and a trigger, the trigger is provided with N input terminals and M output terminals, the mth switch tube is provided in the mth power supply line in the charging line, the mth power supply line is used to connect to the mth power supply pin in the charging interface, 1≤m≤M; The i-th input terminal of the trigger is connected to the i-th target line, and the m-th output terminal of the trigger is connected to the control terminal of the m-th switch tube; The trigger is used to control the target switch tube to switch to a disconnected state when a short circuit occurs on the i-th target pin; Among them, the target switch tube is a switch tube set in the target power supply circuit, the target power supply circuit is a power supply circuit connected to the target power supply pin, and the target power supply pin is the power supply pin in the charging interface that is closest to the i-th target pin.

8. The charging port short circuit detection circuit according to claim 1, characterized in that: The charging interface short circuit detection circuit further includes a circuit breaker unit, and the circuit breaker unit is arranged on the charging line; The disconnecting unit is used to cut off the power supply line in the charging cable when receiving a user instruction.

9. A charging cable, characterized in that: The charging cable includes the charging interface short-circuit detection circuit according to any one of claims 1-8.

10. A charger, characterized in that: The charger comprises a charging head, a charging interface and the charging cable according to claim 9, one end of the charging cable is connected to the charging head, and the other end of the charging cable is connected to the charging interface.

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