WO2023151376A1

WO2023151376A1 - Electric spark elimination circuit, power adapter, and electronic device

Info

Publication number: WO2023151376A1
Application number: PCT/CN2022/138692
Authority: WO
Inventors: 李宏源
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-02-11
Filing date: 2022-12-13
Publication date: 2023-08-17
Also published as: CN216959322U

Abstract

An electric spark elimination circuit, a power adapter, and an electronic device. The electric spark elimination circuit (100) comprises: a change-over switch (S), a first end of the change-over switch (S) being connected to an output end of a direct-current power supply, and a second end of the change-over switch (S) being connected to a load; and a detection control module (110), the detection control module (110) being respectively connected to a third end of the change-over switch (S), a control end of the change-over switch (S) and an output end of the direct-current power supply, and the detection control module (110) being used for detecting a current at the output end of the direct-current power supply, controlling the first end and the second end of the change-over switch (S) to be communicated with each other when a current is detected, and controlling the second end and the third end of the change-over switch (S) to be communicated with each other when no current is detected.

Description

Spark elimination circuit, power adapter and electronic equipment

Cross References to Related Applications

This disclosure claims the priority of the Chinese patent application with application number 202220287036.2 and titled "Electric Spark Elimination Circuit, Power Adapter, and Electronic Equipment" filed on February 11, 2022, the entire contents of which are incorporated by reference in this disclosure.

technical field

The present disclosure relates to the technical field of power supply protection, in particular to an electric spark elimination circuit, a power adapter and electronic equipment.

Background technique

Traditionally designed power adapters generally use DC plugs to directly connect to electronic equipment such as notebooks and CPE (Customer Premise Equipment). During use, when the power adapter is charged and plugged into the electronic device, due to problems such as improper connection, electric sparks will be generated at the interface. This phenomenon will not only damage the stability of the interface between the power adapter and the electronic device, reduce the reliability and service life of the device, but also affect the user experience (such as causing users to worry about the safety of the device), and may even cause a fire and cause safety hazards. Hidden danger.

In the related art, a key switch is integrated on the power adapter, and the user is required to insert the power adapter into the electronic device and then start the power adapter to supply power by pressing a key. However, this method still cannot solve the problem of plugging in the electronic device after the power adapter is started, causing electric sparks to still exist.

public content

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first object of the present disclosure is to propose a spark elimination circuit, which can effectively eliminate the spark phenomenon that may be generated when the DC power supply is connected to the load, and effectively protect the safety of the DC power supply and the load.

The second objective of the present disclosure is to provide a power adapter.

The third object of the present disclosure is to provide an electronic device.

In order to achieve the above purpose, the embodiment of the first aspect of the present disclosure proposes a spark elimination circuit, including: a switch, the first end of the switch is connected to the output end of the DC power supply, and the second end of the switch is connected to the load; A detection control module, the detection control module is respectively connected with the third terminal of the switch, the control terminal of the switch and the output terminal of the DC power supply, the detection control module is used to detect the current of the output terminal of the DC power supply, and when a current is detected, The first terminal of the control switch is connected to the second terminal, and when no current is detected, the second terminal of the control switch is connected to the third terminal.

According to the spark elimination circuit of the embodiment of the present disclosure, the detection control module detects the current of the output end of the DC power supply, and when the current is detected, the first end and the second end of the switch are controlled to connect, so that the DC power supply The load supplies power, and when no current is detected, the second terminal and the third terminal of the control switch are connected, so that the detection control module is in the current detection state, thereby controlling whether the detection control module detects the current at the output terminal The switching switch strobes different circuits to ensure that the load is powered only after the output terminal of the DC power supply is in stable contact with the load and generates current, which effectively eliminates the electric spark phenomenon that may be generated when the DC power supply is connected to the load, and effectively protects the DC power supply. Safety of power supply and load.

According to an embodiment of the present disclosure, the detection control module includes: a first detection control unit, a second detection control unit and an OR gate circuit. Wherein, the first detection control unit is respectively connected with the output terminal of the DC power supply, the third terminal of the switch and the first input terminal of the OR gate circuit to detect the current of the output terminal of the DC power supply; the second detection control unit is respectively connected with the DC power supply The output end of the OR gate circuit is connected to the second input end of the OR gate circuit to detect the current of the output end of the DC power supply; the output end of the OR gate circuit is connected to the control end of the switch to detect the current in the first detection control unit or the second detection control unit. When the control unit detects that there is current, it controls the first end of the switch to connect with the second end, and when the first detection unit and the second detection unit detect no current, it controls the second end of the switch to connect to the third end. end-to-end connection.

According to an embodiment of the present disclosure, the first detection control unit includes: a first voltage divider circuit, the input end of the first voltage divider circuit is connected to the output end of the DC power supply; a first current detection resistor, one end of the first current detection resistor Connected to the output end of the first voltage divider circuit, the other end of the first current-sensing resistor is connected to the third end of the switch; the first comparator, the positive input end of the first comparator is connected to one end of the first current-sensing resistor , the negative input end of the first comparator is connected with the other end of the first current detection resistor, and the output end of the first comparator is connected with the first input end of the OR circuit.

According to an embodiment of the present disclosure, the second detection control unit includes: a second current detection resistor, one end of the second current detection resistor is connected to the output terminal of the DC power supply, and the other end of the second current detection resistor is connected to the first end of the switch. The second comparator, the positive input terminal of the second comparator is connected with one end of the second current-sensing resistor, the negative input terminal of the second comparator is connected with the other end of the second current-sensing resistor, and the second comparator’s The output end is connected with the second input end of the OR gate circuit.

According to an embodiment of the present disclosure, the first voltage dividing circuit includes: a first voltage dividing resistor, one end of the first voltage dividing resistor is used as an input end of the voltage dividing circuit; a second voltage dividing resistor, one end of the second voltage dividing resistor is connected to The other end of the first voltage dividing resistor is connected to form a connection point, and the connecting point is used as an output end of the voltage dividing circuit, and the other end of the second voltage dividing resistor is grounded.

According to an embodiment of the present disclosure, the resistance of the second current detection resistor is greater than 0 and less than or equal to 0.1Ω.

To achieve the above purpose, the embodiment of the second aspect of the present disclosure provides a power adapter, including the aforementioned spark elimination circuit.

According to the power adapter of the embodiment of the present disclosure, the electric spark phenomenon that may be generated when the power adapter is connected to the load can be effectively eliminated through the aforementioned spark elimination circuit, effectively protecting the safety of the power adapter and the load.

In order to achieve the above purpose, the embodiment of the third aspect of the present disclosure provides an electronic device, including the aforementioned spark elimination circuit.

According to the electronic device of the embodiment of the present disclosure, the electric spark phenomenon that may be generated when the DC power supply is connected to the electronic device can be effectively eliminated through the aforementioned spark elimination circuit, effectively protecting the safety of the DC power supply and the electronic device.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

FIG. 1 is a schematic structural diagram of a spark elimination circuit according to an embodiment of the present disclosure;

2 is a schematic diagram of a spark elimination circuit applied to a power adapter according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an electric spark elimination circuit applied to an electronic device according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a spark elimination circuit according to another embodiment of the present disclosure;

FIG. 5 is a circuit diagram of a spark suppression circuit according to one embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present disclosure and should not be construed as limiting the present disclosure.

The following describes the spark elimination circuit, power adapter and electronic equipment proposed by the embodiments of the present disclosure with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a spark elimination circuit according to an embodiment of the present disclosure. Referring to FIG. 1 , the spark elimination circuit 100 includes: a switching switch S and a detection control module 110 . Wherein, the first terminal of the switch S is connected to the output terminal of the DC power supply, and the second terminal of the switch S is connected to the load; the detection control module 110 is respectively connected to the third terminal of the switch S, the control terminal of the switch S and the DC connected to the output of the power supply. The detection control module 110 is used to detect the current of the output end of the DC power supply, and when a current is detected, the first end and the second end of the switch S are controlled to be connected; when no current is detected, the second end of the switch S is controlled to connected to the third end.

It should be noted that the DC power supply may be a device or circuit capable of generating DC power, such as a power adapter, and the load may be an electronic device that requires DC power supply, such as a notebook or a CPE, and the details are not limited in this disclosure. In practical applications, the spark elimination circuit 100 can be integrated into a power adapter or electronic equipment.

In the following, the integration of the spark elimination circuit 100 into the power adapter will be described firstly.

As shown in FIG. 2, the power adapter includes an ACDC module (i.e. a DC power supply) and a spark elimination circuit 100, wherein the input end of the ACDC module is connected to an AC plug for connecting to an AC power supply through the AC plug, and the output end of the ACDC module It is connected with the input terminal of the spark elimination circuit 100, and the output terminal of the spark elimination circuit 100 is connected with the DC plug for connecting with the load through the DC plug.

When in use, after the AC plug of the power adapter is inserted into the AC power supply, the ACDC module will convert the AC power provided by the AC power supply to obtain DC power, and the power adapter is in a charged state. If the DC plug of the power adapter is not inserted into the load at this time, that is, the second end of the switch S is not connected to the load, the ACDC module and the load do not form a path, and the output terminal of the ACDC module has no current, and the detection control module 110 detects no current at this time. , the second terminal and the third terminal of the switch S are in the connected state, the spark elimination circuit 100 is in the current detection state, and has been detecting whether there is current at the output terminal of the ACDC module; if the DC plug of the power adapter is reliably inserted into the load, the switch The second end of S is connected to the load. Since the second end of the switch S is connected to the third end, the ACDC module will form a connection with the load through the detection control module 110, the third end of the switch S, and the second end of the switch S. There is current at the output terminal of the ACDC module. At this time, the detection control module 110 detects that there is current, the first terminal and the second terminal of the switch S are in the connected state, the ACDC module supplies power to the load, and the spark elimination circuit 100 is in the power supply state. . During the process of supplying power to the load, the detection control module 110 will detect that the output terminal of the ACDC module has a constant current, the first terminal and the second terminal of the switch S remain connected, and the ACDC module continuously supplies power to the load. If the DC plug of the power adapter is pulled out from the load, that is, the second end of the switch S loses the load, the output end of the ACDC module will have no current. At this time, the detection control module 110 detects that there is no current, and the second end of the switch S and The third end is in the connected state, and the spark elimination circuit 100 enters the current detection state again. Since the spark elimination circuit 100 is in the current detection state during the unplugging process, the electric spark during the unplugging process can also be eliminated.

Therefore, when the power adapter is not stably connected to the load, the detection control module 110 is in the detection mode. By detecting whether there is current at the output terminal of the ACDC module, if there is current, it means that the power adapter is stably connected to the load. At this time, the detection control module 110 controls the ACDC module to be connected to the load to supply power to the load normally, thus ensuring that the ACDC module is disconnected from the load before the power adapter is stably connected to the load, and after the power adapter is stably connected to the load, the ACDC The module is connected to the load, which prevents the ACDC module from being connected to the load before the power adapter is not stably connected to the load, thereby avoiding the generation of electric sparks when the power adapter is connected to the load, and ensuring the safety of the power adapter and load . It should be noted that when the spark elimination circuit 100 is in the current detection state, when the power adapter is connected to the load, the generated voltage and current are relatively small, and no spark will be generated.

In the following, the integration of the spark elimination circuit 100 into an electronic device will be described firstly.

As shown in FIG. 3 , the electronic equipment includes loads such as a spark elimination circuit 100 and a processor, wherein the input end of the spark elimination circuit 100 is connected to a DC plug for connecting to a DC power supply through a DC plug, and the spark elimination circuit 100 The output terminal is connected to loads such as processors.

When in use, when the DC power supply is not inserted into the DC plug of the electronic device, the detection control module 110 detects that there is no current, the second terminal and the third terminal of the switch S are in the connected state, and the spark elimination circuit 100 is in the current detection state. Always detect whether there is current at the output end of the DC power supply; if the DC power supply is reliably inserted into the DC plug of the electronic device, since the second end of the switch S is connected to the third end, the DC power supply will pass through the detection control module 110 and the switch S. The third terminal and the second terminal of the switch S form a path with the load, and the output terminal of the DC power supply has a current. At this time, the detection control module 110 detects that there is current, and the first terminal and the second terminal of the switch S are in a connected state. The DC power supplies power to the load, and the spark elimination circuit 100 is in a power supply state. During the process of supplying power to the load, the detection control module 110 will detect that the output terminal of the DC power supply has a constant current, the first terminal and the second terminal of the switch S remain connected, and the DC power supply continues to supply power to the load. If the DC power supply is pulled out from the DC plug of the electronic device, the detection control module 110 detects that there is no current, the second end and the third end of the switch S are in the connected state, and the spark elimination circuit 100 enters the current detection state again. During the process, the spark elimination circuit 100 is in the state of current detection, so it can also eliminate the spark in the process of pulling out.

Therefore, when the DC power supply is not stably connected to the electronic equipment, the detection control module 110 is in the detection mode, and detects whether there is current at the output terminal of the DC power supply. If there is current, it means that the DC power supply is stably connected to the electronic equipment. The control module 110 controls the connection of the DC power supply and the load of the electronic equipment to supply power to the load normally, thus ensuring that the DC power supply and the load of the electronic equipment are in a disconnected state before the DC power supply is not stably connected to the electronic equipment, and the DC After the power supply is stably connected to the electronic equipment, the load of the DC power supply and the electronic equipment is in a connected state, avoiding the connection of the DC power supply and the load of the electronic equipment before the DC power supply and the electronic equipment are not stably connected, thereby avoiding the DC power supply. The generation of electric sparks when connecting with electronic equipment ensures the safety of DC power supply and electronic equipment. It should be noted that when the spark elimination circuit 100 is in the current detection state, when the DC power supply is connected to the electronic device, the generated voltage and current are relatively small, and no spark will be generated.

In the above embodiment, the switching switch is controlled by detecting whether the current at the output end of the DC power supply exists through the detection control module, so that the spark elimination circuit is in different working states, and it is ensured that only after the output end of the DC power supply is stably connected to the load and generates current. The load is powered normally, thus achieving the technical effect of not generating electric sparks in the process of connecting the DC power supply to the load, thereby protecting the safety of the DC power supply and the load equipment.

In some embodiments, as shown in FIG. 4 , the detection control module 110 includes: a first detection control unit 111 , a second detection control unit 112 and an OR gate circuit 113 . Wherein, the first detection control unit 111 is respectively connected with the output terminal of the DC power supply, the third terminal of the switch S and the first input terminal of the OR gate circuit to detect the current of the output terminal of the DC power supply; the second detection control unit 112 is respectively Be connected with the output terminal of DC power supply and the second input terminal of OR gate circuit 113, in order to detect the electric current of the output terminal of DC power supply; The output terminal of OR gate circuit 113 is connected with the control terminal of switch S, in order to detect When the control unit 111 or the second detection control unit 112 detects that there is current, the first end and the second end of the control switch S are connected, and when the first detection unit 111 and the second detection unit 112 both detect no current , to control the connection between the second terminal and the third terminal of the switching switch S.

Specifically, when the DC power supply or the load is not stably connected, the output terminal of the DC power supply does not form a path with the load, and there is no current at the output terminal of the DC power supply. At this time, the first detection control unit 111 and the second detection control unit 112 are both When no current is detected, the OR gate circuit 113 outputs a low level, the second end of the switch S is connected to the third end, and the spark elimination circuit 100 is in the current detection state, and always detects whether there is current at the output end of the DC power supply; When both the DC power supply and the load are connected stably, since the second terminal of the switch S is connected to the third terminal, the DC power supply will pass through the first detection unit 111, the third terminal of the switch S and the second terminal of the switch S Form a path with the load, at this time, the first detection control unit 111 will detect that there is current in the circuit, the second detection unit 112 will detect that there is no current in the circuit, and the OR gate circuit 113 will output a high level to control the switch S. One end is connected to the second end, the DC power supplies normal power to the load through the circuit where the second detection control unit 112 is located, and the spark elimination circuit 100 is in the power supply state. In the normal power supply process, the first detection control unit 111 will detect no current, the second detection control unit 112 will continue to detect current, the OR gate circuit 113 will continue to output high level, switch the first end of the switch S and the second The two ends remain connected, and the DC power supply continues to supply power to the load. When the DC power supply or the load is disconnected, the output terminal of the DC power supply does not form a path with the load, the first detection control unit 111 and the second detection control unit 112 both detect no current, the OR gate circuit 113 outputs a low level, and the switch S The second terminal and the third terminal are connected, the spark elimination circuit 100 switches to the current detection state again, and the first detection control unit 111 continues to detect whether there is current at the output terminal of the DC power supply.

As a result, the detection control module 100 realizes the normal power supply to the load only after the output terminal of the DC power supply is stably connected to the load and generates current, so that no electric sparks are generated during the connection process of the DC power supply and the load, so that This is the technical effect of protecting the safety of DC power supply and load equipment.

In some embodiments, as shown in FIG. 5 , the first detection control unit 111 includes: a first voltage divider circuit U1 , a first current detection resistor R1 , and a first comparator COMP1 . Wherein, the input end of the first voltage dividing circuit U1 is connected with the output end of the DC power supply; one end of the first current detecting resistor R1 is connected with the output end of the first voltage dividing circuit U1, and the other end of the first current detecting resistor R1 is connected with the switching The third end of the switch S is connected; the positive input end of the first comparator COMP1 is connected with one end of the first current detection resistor R1, the negative input end of the first comparator COMP1 is connected with the other end of the first current detection resistor R1, and the first The output terminal of a comparator COMP1 is connected with the first input terminal of the OR gate circuit 113 .

The second detection control unit 112 includes: a second current detection resistor R2 and a second comparator COMP2. Wherein, one end of the second current detection resistor R2 is connected to the output end of the DC power supply, and the other end of the second current detection resistor R2 is connected to the first end of the switch S; the positive input end of the second comparator COMP2 is connected to the second detection One terminal of the current detection resistor R2 is connected, the negative input terminal of the second comparator COMP2 is connected to the other terminal of the second current detection resistor R2, and the output terminal of the second comparator COMP2 is connected to the second input terminal of the OR circuit 113 .

OR gate circuit 113 comprises: OR gate OR, the first input end of OR gate OR is connected with the output end of first comparator COMP1, the second input end of OR gate OR is connected with the output end of second comparator COMP2, or gate The output terminal of OR is connected with the control terminal of switch S.

The first detection control unit 111 and the second detection control unit 112 detect whether there is current through their internal comparators to detect the voltage at both ends of their internal current-sensing resistors, and control the switch S to switch through the OR gate circuit 113. The working state of the spark elimination circuit 100 can further avoid electric sparks that may be generated when the DC power supply is connected to the load.

Specifically, as shown in FIG. 5, when the DC power supply or load is not stably connected, the circuit where the first current-sensing resistor R1 and the second current-sensing resistor R2 are located does not form a loop, and there is no current. The first comparator COMP1 The potentials of the positive and negative input terminals of the second comparator COPM2 are both 0. According to the characteristics of the comparator, the output terminals of the two comparators output a low level, and the OR gate OR outputs a low level, and then controls the second terminal of the switch S It is connected with the third terminal. At this time, the spark elimination circuit 100 is in the current detection state, and it has been detecting whether there is current at the output terminal of the DC power supply, that is, detecting whether there is current flowing through the first current-sensing resistor R1 and the second current-sensing resistor. R2; when both the DC power supply and the load are stably connected, since the second terminal and the third terminal of the switch S are connected, the DC power supply forms a loop with the load through the voltage divider circuit U1, the first current-sensing resistor R1 and the switch S , the DC power supply outputs current to the load, and the current flows through the first current-sensing resistor R1. According to the principle of voltage division, the potential of the positive input terminal of the first comparator COMP1 is higher than that of the negative input terminal, and the output terminal of the first comparator COMP1 outputs high At this time, the output terminal of the second comparator COMP2 still outputs a low level, and the OR gate OR will output a high level, and then the first terminal and the second terminal of the switching switch S are controlled to be connected. At this time, the DC power supply is switched The switch S supplies power to the load, and the spark elimination circuit 100 is in a power supply state. During the process of the DC power supplying the load, the DC power supply outputs current to the load, and the current flows through the second current-sensing resistor R2. According to the principle of voltage division, the potential of the positive input terminal of the second comparator COMP2 is higher than the potential of the negative input terminal, and the second The output terminal of the comparator COMP2 outputs a high level. At this time, since there is no current flowing through the first current-sensing resistor R1, the output terminal of the first comparator COMP1 outputs a low level, and the OR gate OR will output a high level, and then control The first terminal and the second terminal of the switching switch S are kept connected, so as to ensure that the DC power supply continuously supplies power to the load. When the DC power supply or load is disconnected again, no current flows through the first current-sensing resistor R1 and the second current-sensing resistor R2, and both the first comparator COMP1 and the second comparator COPM2 output low level, or gate OR outputs a low level, and then controls the second terminal and the third terminal of the switch S to be connected, and at this time, the spark elimination circuit 100 is in the current detection state again.

Therefore, through port resistance detection, it is determined whether the DC power supply and load are stably inserted based on the change of impedance before and after the DC power supply and load are stably connected, so as to control the switching action and avoid the generation of electric sparks. It should be noted that capacitance detection can also be used to determine whether the DC power supply and load are stably inserted based on the change in capacitive reactance before and after the DC power supply and load are stably connected, so as to control the switching action and avoid the generation of electric sparks.

Further, continuing to refer to FIG. 5 , the first voltage dividing circuit U1 includes: a first voltage dividing resistor R3 and a second voltage dividing resistor R4, and one end of the first voltage dividing resistor R3 is used as an input terminal of the first voltage dividing circuit U1 It is connected to the output end of the DC power supply; one end of the second voltage dividing resistor R4 is connected to the other end of the first voltage dividing resistor R3 and a connection point is formed, which serves as the output end of the first voltage dividing circuit U1 and the first detector One end of the current resistor R1 is connected to each other, and the other end of the second voltage dividing resistor R4 is grounded. The function of the voltage divider circuit U1 is to reduce the output voltage of the spark elimination circuit 100 when it is in the current detection state, so as to ensure that the voltage applied to the first current detection resistor R1 is small when the load is connected to the DC power supply, thereby ensuring that the voltage flowing through The current of the first current-sensing resistor R1 is relatively small, so that the spark elimination current 100 is in a state of low voltage and low current, so as to not only realize the detection of the load connected to the DC power supply, but also prevent sparks. Further, the resistance value of the first current resistor R1 may be a resistor with a larger resistance value, so as to ensure a smaller current in the current detection state.

Further, the resistance value of the second current detection resistor R2 in the above embodiment is greater than 0 and less than or equal to 0.1Ω, that is to say, the resistance value of the second current detection resistor R2 is a small value close to zero, for example, the second detection resistor R2 The resistance value of the current resistance R2 is 0.01Ω, so that not only the current detection under the power supply state can be realized to detect whether the load is disconnected from the DC power supply, but also to ensure that when the load is disconnected from the DC power supply, the spark elimination circuit 100 enters into the In addition, it can reduce the circuit loss when the DC power supply supplies power to the load, and improve the power supply efficiency.

Further, in the above-mentioned embodiment, in the process of plugging and unplugging the DC power supply or load, the plug-in port can be equivalent to a resistor with variable resistance. The resistance value is very large at the beginning of the connection, and the resistance value is 0Ω when the connection is stable. . According to the electrical characteristics of the offset voltage of the comparator, the first current-sensing resistor R1 with an appropriate resistance can be selected according to the parameters such as the offset voltage of the comparator, the DC power supply voltage, and the equivalent resistance of the load end, and controlled in the process of DC power supply or load During the insertion process, after the current of the circuit where the first current-sensing resistor R1 is located is greater than a certain threshold, the voltage at both ends of the comparator is greater than the offset voltage and outputs a high level, thereby controlling the switching switch S to change to a DC output mode; Select the second current-sensing resistor R2 with an appropriate resistance within the range of 0 to 0.1Ω, and control the voltage across the comparator to be less than Offset voltage and output low level, so as to control the switch S action to change to detection mode. Through the above method, an appropriate current threshold can be selected for the power supply circuit as the switching node of the working mode of the spark elimination circuit, thereby improving the precision of spark elimination of the circuit, achieving the technical effects of enhancing circuit protection capability and improving circuit stability.

To sum up, according to the spark elimination circuit of the present disclosure, during the process of plugging and unplugging the DC power supply or the load, the spark elimination circuit always works in the detection mode, which ensures that the voltage and current output of the DC power supply to the load are both small, thus The phenomenon of electric sparks that may occur in this process is eliminated, and finally the technical effect of eliminating electric sparks and protecting the safety of equipment and circuits is achieved in the process of plugging and unplugging DC power supplies or loads.

In some embodiments, embodiments of the present disclosure further provide a power adapter, which includes the aforementioned spark elimination circuit.

According to the power adapter of the embodiment of the present disclosure, through the aforementioned spark elimination circuit, it is ensured that the power adapter will not generate electric sparks during the process of plugging and unplugging the electronic equipment, thereby achieving the technical effect of protecting the safety of the power adapter and the electronic equipment.

In some embodiments, the embodiments of the present disclosure further provide an electronic device, which includes the aforementioned spark elimination circuit.

According to the electronic device in the embodiment of the present disclosure, the aforementioned spark elimination circuit ensures that no spark occurs when an external power adapter is connected or unplugged, thereby achieving the technical effect of protecting the safety of the power adapter and the electronic device.

It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this disclosure, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it may be a fixed connection or a detachable connection, unless otherwise clearly defined and limited. , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present disclosure, and those skilled in the art can understand the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

Spark suppression circuits, including:

A switch, the first end of the switch is connected to the output end of the DC power supply, and the second end of the switch is connected to the load;

A detection control module, the detection control module is respectively connected to the third terminal of the switch, the control terminal of the switch and the output terminal of the DC power supply, and the detection control module is used to detect the output of the DC power supply The current of the output terminal, and when the current is detected, the first terminal of the switch is controlled to be connected to the second terminal, and when no current is detected, the second terminal of the switch is controlled to be connected to the third terminal Pass.
The spark elimination circuit according to claim 1, wherein the detection control module comprises: a first detection control unit, a second detection control unit and an OR gate circuit,

The first detection control unit is respectively connected to the output terminal of the DC power supply, the third terminal of the switch and the first input terminal of the OR gate circuit to detect the current of the output terminal of the DC power supply;

The second detection control unit is respectively connected to the output terminal of the DC power supply and the second input terminal of the OR gate circuit to detect the current of the output terminal of the DC power supply;

The output terminal of the OR gate circuit is connected to the control terminal of the switch, and is used to control the first switch of the switch when the first detection control unit or the second detection control unit detects that there is current. The terminal is connected to the second terminal, and when the first detection unit and the second detection unit both detect no current, the second terminal of the switch is controlled to be connected to the third terminal.
The spark elimination circuit according to claim 2, wherein the first detection control unit comprises:

A first voltage divider circuit, the input end of the first voltage divider circuit is connected to the output end of the DC power supply;

A first current-sensing resistor, one end of the first current-sensing resistor is connected to the output end of the first voltage divider circuit, and the other end of the first current-sensing resistor is connected to the third end of the switch;

a first comparator, the positive input terminal of the first comparator is connected to one end of the first current-sensing resistor, the negative input terminal of the first comparator is connected to the other end of the first current-sensing resistor, The output terminal of the first comparator is connected with the first input terminal of the OR gate circuit.
The spark elimination circuit according to claim 2 or 3, wherein the second detection control unit comprises:

A second current-sensing resistor, one end of the second current-sensing resistor is connected to the output end of the DC power supply, and the other end of the second current-sensing resistor is connected to the first end of the switch;

a second comparator, the positive input terminal of the second comparator is connected to one end of the second current-sensing resistor, the negative input terminal of the second comparator is connected to the other end of the second current-sensing resistor, The output terminal of the second comparator is connected with the second input terminal of the OR gate circuit.
The spark elimination circuit according to claim 3, wherein the first voltage dividing circuit comprises:

a first voltage-dividing resistor, one end of the first voltage-dividing resistor serves as an input end of a corresponding voltage-dividing circuit;

The second voltage dividing resistor, one end of the second voltage dividing resistor is connected to the other end of the first voltage dividing resistor and a connection point is formed, the connecting point is used as the output end of the voltage dividing circuit, and the second voltage dividing resistor The other end of the piezoresistor is grounded.
The spark elimination circuit according to claim 4, wherein the resistance of the second current detection resistor is greater than 0 and less than or equal to 0.1Ω.
A power adapter comprising the spark elimination circuit according to any one of claims 1-6.
Electronic equipment, comprising the spark elimination circuit according to any one of claims 1-6.