Sparkproof direct-current power socket
By using a MOSFET and a delay circuit to control the conduction of the positive switch circuit in a DC power socket, the problem of electrical sparks caused by uneven socket contact is solved, and an automatic anti-spark function is achieved during plugging, thus improving electrical safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QISDA SUZHOU
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-08
AI Technical Summary
During the connection process, existing DC power sockets may generate electrical sparks due to uneven contact points leading to increased local resistance. Furthermore, users operating the sockets and switches in the correct order poses a potential electrical safety hazard.
Design a spark-proof DC power socket that uses a MOSFET and a delay circuit to control the conduction of the positive switch circuit, and automatically prevents the generation of electric sparks by the elastic contact and separation between the negative pin and the switch control pin.
Automatically prevents electrical sparks when plugging into the socket, improving electrical safety and ensuring that no sparks are generated during plug insertion, thus enhancing the safety of the socket.
Smart Images
Figure CN224217845U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power sockets, and in particular to a spark-proof DC power socket. Background Technology
[0002] In current DC power sockets, it's difficult to achieve a perfectly smooth contact surface during connection, leading to increased local resistance at the contact points. When current flows through these areas of increased resistance, the high current density generates a violent oxidation-reduction reaction, which can cause tiny metal vapors to evaporate and form electrical sparks.
[0003] In existing technologies, power strips with integrated switches are typically used. After the power strip and electronic devices are plugged in, they are then switched on to prevent sparks. However, many users are not aware of this order and pose a potential electrical safety hazard. Therefore, designing DC power strips that automatically prevent sparks when plugged in has become a new research topic. Utility Model Content
[0004] An embodiment of this utility model provides a DC power socket that can automatically prevent electrical sparks when the socket is plugged in.
[0005] An embodiment of this utility model provides a spark-proof DC power socket for coupling a DC power plug. The spark-proof DC power socket includes:
[0006] The socket housing has a positive pin, a negative pin, and a switch control pin; and
[0007] The spark-proof circuit includes a switch control circuit, a positive switch circuit, a first delay circuit, a positive output terminal, and a negative output terminal. The switch control circuit includes a first MOSFET, the control terminal of which is coupled to the switch control pin. The first terminal of the first MOSFET is coupled to the control terminal of the positive switch circuit via the first delay circuit, and the second terminal of the first MOSFET is coupled to the negative pin. The second terminal of the positive switch circuit is coupled to the positive pin, and the first terminal of the positive switch circuit is coupled to the positive output terminal.
[0008] When the DC power plug is not inserted into the socket housing, the negative pin is elastically abutted against the switch control pin, so that the first end and the second end of the first MOSFET are not connected, and the positive switch circuit remains open; when the DC power plug is inserted into the socket, the negative pin is separated from the switch control pin, the first end and the second end of the first MOSFET are connected, and the positive switch circuit is turned on after a certain period of time.
[0009] Preferably, the positive switch circuit includes a second MOSFET, the control terminal of the positive switch circuit is the gate of the second MOSFET, the first terminal of the positive switch circuit is one of the source and drain of the second MOSFET, and the second terminal of the positive switch circuit is the other of the source and drain of the second MOSFET.
[0010] More preferably, the first end of the first delay circuit is coupled to the positive pin and the second end of the positive switching circuit, the second end of the first delay circuit is coupled to the control end of the positive switching circuit and the first end of the first MOS transistor, and the first delay circuit includes a first resistor and a first capacitor connected in parallel.
[0011] Preferably, the negative pin is directly coupled to the negative output terminal.
[0012] Preferably, the anti-sparking circuit further includes a second delay circuit and a negative switch circuit; the negative switch circuit includes a third MOSFET, the control terminal of the third MOSFET is coupled to the switch control pin through the second delay circuit, the first terminal of the third MOSFET is coupled to the negative pin, and the second terminal of the third MOSFET is coupled to the negative output terminal.
[0013] When the DC power plug is not inserted into the socket housing, the first and second ends of the third MOSFET are not connected; when the DC power plug is inserted into the socket, the first and second ends of the third MOSFET are connected after a certain period of time.
[0014] More preferably, the first end of the second delay circuit is coupled to the switch control pin and the control terminal of the third MOS transistor, the second end of the second delay circuit is coupled to the first end of the third MOS transistor and the negative pin, and the second delay circuit includes a second resistor and a second capacitor connected in parallel.
[0015] Preferably, the socket housing includes an accommodating space and an opening, and the negative terminal pin and the switch control pin are respectively disposed in the accommodating space; wherein, the switch control pin is disposed in the accommodating space away from the opening, and the first part of the negative terminal pin extends to a position adjacent to the opening; when the DC power plug is not inserted into the socket housing, the second part of the negative terminal pin elastically abuts against the switch control pin.
[0016] When the DC power plug is inserted into the opening, the negative plug end of the DC power plug pushes against the first part of the negative pin and undergoes elastic deformation, thereby causing the second part of the negative pin to separate from the switch control pin.
[0017] More preferably, the negative electrode pin is a metal spring, and a portion of the metal spring protrudes toward the insertion position of the negative electrode plug to form the first part of the negative electrode pin.
[0018] Preferably, the first MOS transistor is an NMOS transistor.
[0019] Preferably, an overcurrent protection module is connected in series between the positive pin and the positive output terminal.
[0020] Compared with the prior art, the spark-proof DC power socket provided by the embodiments of this utility model includes a socket housing and a spark-proof circuit. The socket housing has a positive pin, a negative pin, and a switch control pin. The spark-proof circuit includes a switch control circuit, a positive switch circuit, a first delay circuit, a positive output terminal, and a negative output terminal. The switch control circuit includes a first MOSFET, the control terminal of which is coupled to the switch control pin. The first terminal of the first MOSFET is coupled to the control terminal of the positive switch circuit via the first delay circuit, and the second terminal of the first MOSFET is coupled to the negative pin. The second terminal of the positive switch circuit is coupled to the positive pin, and the first terminal of the positive switch circuit is coupled to the positive output terminal. When the DC power plug is not inserted into the socket housing, the negative pin is elastically abutted against the switch control pin, so that the first end and the second end of the first MOSFET are not connected, and the positive switch circuit remains open; when the DC power plug is inserted into the socket, the negative pin is separated from the switch control pin, the first end and the second end of the first MOSFET are connected, and the positive switch circuit is turned on after a certain period of time. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the anti-spark circuit in one embodiment of the present invention;
[0022] Figure 2 This is a schematic diagram of the socket housing when the DC power plug is not inserted in one embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the socket housing structure when the DC power plug is fully inserted in one embodiment of the present invention;
[0024] Figure 4 for Figure 2 A magnified view of a portion of region A in the middle;
[0025] Figure 5 for Figure 3 A magnified view of a portion of region B in the middle;
[0026] Figure 6 This is a schematic diagram of the anti-spark circuit in another embodiment of the present invention. Detailed Implementation
[0027] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.
[0028] Certain terms are used in the specification and claims to refer to specific elements. It will be understood by those skilled in the art that manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to".
[0029] Please see Figures 1 to 3 ,in, Figure 1 This is a schematic diagram of the anti-spark circuit in one embodiment of the present invention. Figure 2 This is a schematic diagram of the socket housing structure when the DC power plug is not inserted, according to one embodiment of the present invention. Figure 3 This is a schematic diagram of the socket housing structure when the DC power plug is inserted into the socket in one embodiment of the present invention. The spark-proof DC power socket 1 provided in this embodiment of the present invention is used to couple a DC power plug 2. The spark-proof DC power socket 1 includes a socket housing 11 and a spark-proof circuit. The socket housing 11 is provided with a positive pin 11a, a negative pin 11b, and a switch control pin 11c. The spark-proof circuit includes a switch control circuit, a positive switch circuit, a first delay circuit 15, a positive output terminal 1a, and a negative output terminal 1b. In a preferred embodiment, the positive output terminal 1a and the negative output terminal 1b are coupled to an electronic device to provide power to the electronic device. Preferably, an overcurrent protection module f is connected in series between the positive pin 11a and the positive output terminal 1a to avoid safety hazards such as excessive circuit voltage caused by short circuits. Preferably, the overcurrent protection module includes at least a fuse assembly, but practical applications are not limited to this.
[0030] The switching control circuit includes a first metal-oxide-semiconductor field-effect transistor Q1 (MOSFET), referred to herein as a MOS transistor. The control terminal 12c of the first MOS transistor Q1 (in this embodiment, it is the gate of the MOS transistor, but this is not a limitation; the control terminals of other MOS transistors are similar and will not be described further) is coupled to the switch control pin 11c. The first terminal 12a of the first MOS transistor Q1 (in this embodiment, it is the drain of the MOS transistor, but this is not a limitation; the first terminal of other MOS transistors is similar and will not be described further) is coupled to the control terminal 13c of the positive switching circuit via the first delay circuit 15. The second terminal 12b of the first MOS transistor Q1 (in this embodiment, it is the source of the MOS transistor, but this is not a limitation; the second terminal of other MOS transistors is similar and will not be described further) is coupled to the negative terminal pin 11b. It should be noted that... Figure 1 To avoid misunderstandings caused by crossover of uncoupled circuits, the second terminal 12b of the first MOSFET Q1 and the negative pin 11b are shown to be coupled via a common ground. This will not be repeated below. When the first terminal 12a and the second terminal 12b of the first MOSFET Q1 are turned on, the control terminal 13c of the positive switching circuit can control the first terminal 13a and the second terminal 13b of the positive switching circuit to be turned on.
[0031] In this embodiment, the second terminal 13b of the positive switching circuit is coupled to the positive pin 11a, and the first terminal 13a of the positive switching circuit is coupled to the positive output terminal 1a. In this embodiment, the negative pin 11b is directly coupled to the negative output terminal 1b.
[0032] like Figure 2 and Figure 4 As shown, when the DC power plug 2 is not inserted into the socket housing 11, the negative pin 11b and the switch control pin 11c are in elastic contact, so that the first terminal 12a and the second terminal 12b of the first MOSFET Q1 are not connected, thereby keeping the first terminal 13a and the second terminal 13b of the positive switching circuit disconnected; as Figure 3 and Figure 5 As shown, when the DC power plug 2 is fully inserted, the negative pin 11b separates from the switch control pin 11c, and the first terminal 12a and the second terminal 12b of the first MOSFET Q1 are turned on. This causes the control terminal 13c of the positive switch circuit to control the first terminal 13a and the second terminal 13b of the positive switch circuit to turn on after a certain period of time. It should be noted that in some embodiments, "the DC power plug 2 is fully inserted" means that the DC power plug 2 is completely inserted into the socket housing 11; in other embodiments, it may also mean that the DC power plug 2 is not completely inserted into the socket housing 11, but the negative pin 11b has separated from the switch control pin 11c; it is not limited to this.
[0033] In some preferred embodiments, such as Figures 2 to 4As shown, the socket housing 11 includes a receiving space s2 and an opening s1. A negative pin 11b and a switch control pin 11c are respectively disposed in the receiving space s2. The switch control pin 11c is located in the receiving space s2 away from the opening s1, and the first portion 11b1 of the negative pin 11b extends to a position adjacent to the opening s1. When the DC power plug 2 is not inserted into the socket housing 11, the second portion 11b2 of the negative pin 11b elastically abuts against the switch control pin 11c. When the DC power plug 2 is inserted into the socket housing 11 through the opening s1, the negative plug end of the DC power plug 2 pushes against the first portion 11b1 of the negative pin 11b, causing elastic deformation, thereby separating the second portion 11b2 of the negative pin 11b from the switch control pin 11c. In other words, the spring force direction of the aforementioned spring-loaded negative pin 11b is relative to the insertion position of the negative plug end. When the DC power plug 2 is not inserted into the socket housing 11, the first part 11b1 of the negative pin 11b moves towards the adjacent opening s1 under its own spring force, and drives the second part 11b2 of the negative pin 11b to elastically abut against the switch control pin 11c. Preferably, as follows... Figures 2 to 5 As shown, the negative pin 11b is a metal spring, a portion of which protrudes towards the insertion position of the negative plug to form the first portion 11b1 of the negative pin 11b. It should be noted that the shape of this metal spring is not necessarily designed to be... Figures 2 to 5 The single-layered, upward-protruding style shown in the example can also be designed as a double-layered U-shape or other similar shapes, and its practical applications are not limited to this. A better option is... Figures 2 to 5 As shown, the surface of the switch control pin 11c corresponding to the negative pin 11b is also provided with a protrusion 11c1. The protrusion 11c1 is used to abut against the negative pin 11b to ensure full contact.
[0034] Thus, taking the first MOS transistor Q1 in this embodiment as an N-channel MOS transistor 12 (hereinafter referred to as NMOS transistor) as an example, as follows... Figure 1As shown, the spark-proof circuit also includes a first node 1c, a positive pin 11a coupled to the first node 1c, and a third resistor R3 connected in series between the positive pin 11a and the first node 1c; a switch control pin 11c coupled to the first node 1c; and a negative pin 11b coupled to the first node 1c, and a fourth resistor R4 connected in series between the negative pin 11b and the first node 1c. When the DC power plug 2 is not inserted into the socket housing 11, the negative pin 11b and the switch control pin 11c are in elastic contact. When the DC power plug 2 is first inserted into the socket housing 11, the negative plug end of the DC power plug 2 is coupled to the negative pin 11b, but before the negative pin 11b is deformed and completely separated from the switch control pin 11c, the current flows from the positive pin 11a through the third resistor R3, the first node 1c and the switch control pin 11c in sequence, and finally flows to the negative pin 11b through the coupling between the negative pin 11b and the switch control pin 11c. The first node 1c and the negative pin 11b are at the same level and are at a low level, and the control terminal 12c of the first MOSFET Q1 is at the same level and is at a low level. The first terminal 12a and the second terminal 12b of the first MOSFET Q1 are not conducting. That is to say, the positive switch circuit is in a state of being kept open at this time to ensure the safety of electricity use. When the DC power plug 2 is inserted into the position, the negative pin 11b is disconnected from the switch control pin 11c. Since the third resistor R3 and the fourth resistor R4 are connected in series between the positive pin 11a (high level) and the negative pin 11b (low level), the voltage is divided by the third resistor R3 and the fourth resistor R4, and the first node 1c changes to a higher level suitable for driving the control terminal 12c of the first MOS transistor Q1. The higher level is lower than the high level of the positive pin 11a and higher than the low level of the negative pin 11b. The specific value of the higher level depends on the design of the resistance values of the third resistor R3 and the fourth resistor R4. This utility model is not limited to this. At this time, the control terminal 12c of the first MOSFET Q1 is coupled to the first node 1c. The control terminal 12c of the first MOSFET Q1 is at the same level as the first node 1c and thus presents a higher level. This causes the control terminal 12c of the first MOSFET Q1 to control its first terminal 12a and second terminal 12b to conduct. Correspondingly, the control terminal 13c of the positive switch circuit controls its first terminal 13a and second terminal 13b to conduct. That is to say, before the first terminal 13a and second terminal 13b of the positive switch circuit are conducted, even if the positive pin 11a is already connected to the positive plug terminal of the DC power plug 2, no current flows at the positive output terminal 1a, which can prevent sparks from being generated during the process of inserting the DC power plug 2 into the socket housing 11. After the first terminal 13a and second terminal 13b of the positive switch circuit are conducted, it means that the DC power plug 2 is stably connected to the socket housing 11, and no more sparks will be generated.In other embodiments, the first MOS transistor Q1 may also be a P-channel MOS transistor 12 (hereinafter referred to as PMOS transistor). The related component settings and circuit layout are adapted according to the type of the first MOS transistor Q1, which is well known to those skilled in the art and will not be described in detail here.
[0035] In a preferred embodiment, the negative pin 11b is positioned within the socket housing 11 such that it is coupled to the DC power plug 2 before the positive pin 11a. In other words, the negative pin 11b can be positioned outside the socket housing 11 relative to the positive pin 11a, allowing the negative pin 11b to contact the DC power plug 2 first, thereby further improving the safety factor of the spark-proof DC power socket 1.
[0036] In a preferred embodiment, the socket housing 11 is further provided with a signal transmission pin 11d. The ground wire of the signal transmission pin 11d can be coupled to the outer casing of the electronic device, but the actual application is not limited to this. The signal transmission pin 11d is positioned relative to the positive pin 11a and the negative pin 11b, respectively, and is coupled to the DC power plug 2. In other words, when the DC power plug 2 is inserted into the socket housing 11, the negative plug end of the DC power plug 2 first contacts the negative pin 11b, then the positive plug end contacts the positive pin 11a, and finally the signal plug end contacts the signal transmission pin 11d. This ensures that after the electronic device is powered on and has a stable voltage, the signal transmission pin 11d is activated and transmits data, providing further protection for the various electronic components in the electronic device.
[0037] In a preferred embodiment, such as Figure 1As shown, the positive switching circuit includes a second MOSFET Q2. The control terminal 13c of the positive switching circuit is the gate of the second MOSFET Q2. The first terminal 13a of the positive switching circuit is one of the source and drain terminals of the second MOSFET Q2, and the second terminal 13b is the other of the source and drain terminals of the second MOSFET Q2. Thus, taking an embodiment where the second MOSFET Q2 is a PMOS transistor as an example, the control terminal 13c of the second MOSFET Q2 can also be coupled to the positive pin 11a through the first delay circuit. The first delay circuit includes a first resistor R1. When the first terminal 12a and the second terminal 12b of the first MOSFET Q1 are not conducting, the control terminal 13c of the second MOSFET Q2 is at a high level, and the first terminal 13a and the second terminal 13b of the second MOSFET Q2 are not conducting; when the first terminal 12a and the second terminal 12b of the first MOSFET Q1 are conducting... By coupling the second terminal 12b of the first MOSFET Q1 to the negative pin 11b, the voltage of the second terminal 15b of the first delay circuit is pulled down to a low level. This first delay circuit is equivalent to being connected in series between the positive pin 11a (high level) and the negative pin 11b (low level). The control terminal 13c of the second MOSFET Q2 is pulled down to a low level, causing the first terminal 13a and the second terminal 13b of the second MOSFET Q2 to conduct, thereby allowing current to flow from the positive pin 11a to the positive output terminal 1a and to the electronic device. In other embodiments, the second MOSFET Q2 can also be an NMOS transistor, and the related component settings and circuit layout are adapted accordingly, which are well known to those skilled in the art and will not be described in detail here.
[0038] Better, such as Figure 1 As shown, the first delay circuit includes not only the first resistor R1 mentioned above, but also a first capacitor C1. The first resistor R1 and the first capacitor C1 are connected in parallel. For ease of understanding, this parallel circuit can be understood as a single circuit module (e.g., ...). Figure 1 (The portion within the dashed box) This circuit module has a first terminal (i.e., the first terminal 15a of the first delay circuit 15) and a second terminal (i.e., the second terminal 15b of the first delay circuit 15). The first terminal 15a of the first delay circuit 15 is coupled to the positive pin 11a and the second terminal 13b of the second MOSFET Q2. The second terminal 15b of the first delay circuit 15 is coupled to the control terminal 13c of the second MOSFET Q2 and the first terminal 12a of the first MOSFET Q1. Thus, the second MOSFET Q2 can be controlled to turn on after a certain period of time. The "turning on after a certain period of time" period can be based on the time constant τ of the RC delay circuit. The time constant τ is described by the following formula:
[0039] τ=R1*C1
[0040] Wherein, R1 is the resistance value of the RC delay sub-circuit, in ohms (Ω); C1 is the capacitance value of the RC delay sub-circuit, in farads (F). In other words, to ensure the second MOSFET Q2 turns on after a specific time, the time constant τ can be set by adjusting the values of resistor R1 and capacitor C1. In practical applications, if it is necessary to reduce this time, a smaller resistance value or a smaller capacitance value can be selected; conversely, if it is necessary to increase this time, a larger resistance value or a larger capacitance value can be selected. The specific resistance and capacitance values need to be designed by technicians to meet electrical safety requirements, and this invention is not limited to this.
[0041] In another preferred embodiment of this utility model, such as Figure 6 As shown, the anti-spark circuit also includes a second delay circuit 16 and a negative switch circuit. The negative switch circuit includes a third MOSFET Q3, which can be either an NMOS or a PMOS transistor depending on the circuit design. The control terminal 14c of the third MOSFET Q3 is coupled to the switch control pin 11c through the second delay circuit 16. The first terminal 14a of the third MOSFET Q3 is coupled to the negative pin 11b, and the second terminal 14b of the third MOSFET Q3 is coupled to the negative output terminal 1b. It can be understood that the control terminal 14c of the third MOSFET Q3 is actually at the same level as the control terminal 12c of the first MOSFET Q1. When the DC power plug 2 is not inserted or has just been inserted into the socket housing 11, the first terminal 14a and the second terminal 14b of the third MOSFET Q3 are not conducting. After the DC power plug 2 is fully inserted, the first terminal 14a and the second terminal 14b of the third MOSFET Q3 conduct after a certain period of time through the second delay circuit 16. The specific principle is not described in detail here. This ensures that the first terminal 14a and the second terminal 14b of the third MOSFET Q3 are turned on only after the voltage is stable, and then a complete circuit loop is formed between the positive pin 11a and the negative pin 11b, further improving the safety factor of the spark-proof DC power socket 1.
[0042] Preferably, the second delay circuit 16 includes a second resistor R2 and a second capacitor C2 connected in parallel. The first terminal 16a of the second delay circuit 16 is coupled to the switch control pin 11c and the control terminal 14c of the third MOSFET Q3. The second terminal 16b of the second delay circuit 16 is coupled to the first terminal 14a and the negative pin 11b of the third MOSFET Q3 to delay the level change of the control terminal 14c of the third MOSFET Q3. Its principle is similar to that of the first delay circuit 15 and will not be described again.
[0043] In summary, the spark-proof DC power socket provided by the embodiments of this utility model includes a socket housing and a spark-proof circuit. The socket housing has a positive pin, a negative pin, and a switch control pin. The spark-proof circuit includes a switch control circuit, a positive switch circuit, a first delay circuit, a positive output terminal, and a negative output terminal. The switch control circuit includes a first MOSFET, the control terminal of which is coupled to the switch control pin. The first terminal of the first MOSFET is coupled to the control terminal of the positive switch circuit via the first delay circuit, and the second terminal of the first MOSFET is coupled to the negative pin. The second terminal of the positive switch circuit is coupled to the positive pin, and the first terminal of the positive switch circuit is coupled to the positive output terminal. When the DC power plug is not inserted into the socket housing, the negative pin is elastically abutting against the switch control pin; when the DC power plug is just inserted into the socket housing, the negative plug end of the DC power plug is coupled to the negative pin, but has not yet been pushed to deform and completely separate from the switch control pin, so that the first end and the second end of the first MOSFET are not connected, and thus the positive switch circuit remains open; when the DC power plug is fully inserted, the negative pin is separated from the switch control pin, the first end and the second end of the first MOSFET are connected, and thus the positive switch circuit is turned on after a certain period of time.
[0044] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.
Claims
1. A spark-proof DC power socket for coupling a DC power plug, characterized in that, include: The socket housing has a positive pin, a negative pin, and a switch control pin; and The spark-proof circuit includes a switch control circuit, a positive switch circuit, a first delay circuit, a positive output terminal, and a negative output terminal. The switch control circuit includes a first MOSFET, the control terminal of which is coupled to the switch control pin. The first terminal of the first MOSFET is coupled to the control terminal of the positive switch circuit via the first delay circuit, and the second terminal of the first MOSFET is coupled to the negative pin. The second terminal of the positive switch circuit is coupled to the positive pin, and the first terminal of the positive switch circuit is coupled to the positive output terminal. When the DC power plug is not inserted into the socket housing, the negative pin is elastically abutted against the switch control pin, so that the first end and the second end of the first MOSFET are not connected, and the positive switch circuit remains open; when the DC power plug is inserted into the socket, the negative pin is separated from the switch control pin, the first end and the second end of the first MOSFET are connected, and the positive switch circuit is turned on after a certain period of time.
2. The spark-proof DC power socket as described in claim 1, characterized in that, The positive switch circuit includes a second MOSFET. The control terminal of the positive switch circuit is the gate of the second MOSFET. The first terminal of the positive switch circuit is one of the source and drain of the second MOSFET. The second terminal of the positive switch circuit is the other of the source and drain of the second MOSFET.
3. The spark-proof DC power socket as described in claim 2, characterized in that, The first terminal of the first delay circuit is coupled to the positive pin and the second terminal of the positive switching circuit. The second terminal of the first delay circuit is coupled to the control terminal of the positive switching circuit and the first terminal of the first MOS transistor. The first delay circuit includes a first resistor and a first capacitor connected in parallel.
4. The spark-proof DC power socket as described in claim 1, characterized in that, The negative pin is directly coupled to the negative output terminal.
5. The spark-proof DC power socket as described in claim 1, characterized in that, The spark-proof circuit also includes a second delay circuit and a negative switch circuit; the negative switch circuit includes a third MOSFET, the control terminal of the third MOSFET is coupled to the switch control pin through the second delay circuit, the first terminal of the third MOSFET is coupled to the negative pin, and the second terminal of the third MOSFET is coupled to the negative output terminal. When the DC power plug is not inserted into the socket housing, the first and second ends of the third MOSFET are not connected; when the DC power plug is inserted into the socket, the first and second ends of the third MOSFET are connected after a certain period of time.
6. The spark-proof DC power socket as described in claim 5, characterized in that, The first end of the second delay circuit is coupled to the switch control pin and the control terminal of the third MOS transistor, and the second end of the second delay circuit is coupled to the first end of the third MOS transistor and the negative pin. The second delay circuit includes a second resistor and a second capacitor connected in parallel.
7. The spark-proof DC power socket as described in claim 1, characterized in that, The socket housing includes a receiving space and an opening, and the negative pin and the switch control pin are respectively disposed in the receiving space; wherein, the switch control pin is disposed in the receiving space away from the opening, and the first part of the negative pin extends to a position adjacent to the opening; when the DC power plug is not inserted into the socket housing, the second part of the negative pin elastically abuts against the switch control pin. When the DC power plug is inserted into the opening, the negative plug end of the DC power plug pushes against the first part of the negative pin and undergoes elastic deformation, thereby causing the second part of the negative pin to separate from the switch control pin.
8. The spark-proof DC power socket as described in claim 7, characterized in that, The negative pin is a metal spring, and a portion of the metal spring protrudes toward the insertion position of the negative plug end to form the first part of the negative pin.
9. The spark-proof DC power socket as described in claim 1, characterized in that, The first MOS transistor is an NMOS transistor.
10. The spark-proof DC power socket as described in claim 1, characterized in that, An overcurrent protection module is also connected in series between the positive pin and the positive output terminal.