Connectors, switching power supplies, and communication power supply systems

Abstract

The present disclosure provides a connector, a switching power supply, and a power supply system for communication, the connector including a first contact, a second contact, a capacitor precharge circuit, and a control circuit. The first contact is detachably connected to the second contact and connected to an output end of a power supply device, the second contact is connected to a DC bus, the capacitor precharge circuit and the control circuit are both provided on the first contact, the capacitor precharge circuit is connected to the capacitor circuit, and the control circuit controls the power supply device to be turned on and off. Thus, in the step of inserting the first contact into the second contact, the control circuit controls the power supply device to be turned on after the DC bus charges the capacitor circuit via the capacitor precharge circuit, and in the step of removing the first contact from the second contact, the control circuit controls the power supply device to be turned off before the connection between the power supply device and the DC bus is cut off. As can be seen from this, the present disclosure can reduce the power consumption of the switching power supply and simplify the structure of the switching power supply.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This disclosure is based on Chinese Patent Application CN202110414448.8, titled "Connector, Switching Power Supply, and Communication Power Supply System", filed on April 16, 2021. The priority of this patent application is claimed, and all of its disclosure content is incorporated into this disclosure by reference.

[0002] [Technical Field] This disclosure relates to the technical field of electricity, specifically to a connector, a switching power supply, and a communication power supply system.

Background Art

[0003] To ensure reliability, usually, a communication power supply system, as an important component of a communication system, is provided with a plurality of switching power supplies. Thereby, to achieve the flexibility of the communication power supply system, the switching power supply can usually support hot - plugging, that is, the insertion and removal of the switching power supply do not affect the normal operation of the communication power supply system.

[0004] The hot - plugging of the switching power supply may cause the occurrence of arc discharge (referred to as a spark), and the high temperature caused by the arc discharge damages the connector in the switching power supply. Therefore, in the related art, to suppress the occurrence of arc discharge, usually, a current - limiting resistor is connected in series to the output capacitor of the switching power supply, and a current detection device and an arc - extinguishing structure are separately provided for the switching power supply. However, according to the above - mentioned embodiments, the power consumption of the switching power supply is too high, and the structure of the switching power supply becomes too complex. [[ID=​​​​​​​​Accordingly, embodiments of this disclosure provide connectors, switching power supplies, and communication power supply systems to reduce the power consumption of switching power supplies and simplify the structure of switching power supplies. [Means for solving the problem]

[0006] In the first embodiment, the embodiments of the present disclosure are as follows: A first contact connected to the output terminal of a power supply, wherein a capacitor circuit is provided at the output terminal of the power supply, A second contact is detachably connected to the first contact and connected to the DC bus of the communication power system, A capacitor precharge circuit is provided in the first contact and connected to the capacitor circuit, The first contact includes a control circuit provided on the first contact and connected to the power supply, which controls the on and off of the power supply, The present invention provides a connector in which, in the step of inserting the first contact into the second contact, the DC bus charges the capacitor circuit via the capacitor precharge circuit before the control circuit turns on the power supply, and in the step of withdrawing the first contact from the second contact, the control circuit turns off the power supply before the connection between the power supply and the DC bus is disconnected.

[0007] In a second embodiment, an embodiment of the present disclosure provides a switching power supply comprising a power supply unit and a connector as described in the first embodiment, wherein the output terminal of the power supply unit is connected to the connector.

[0008] In a third embodiment, an embodiment of the present disclosure provides a communication power supply system comprising a DC bus and a switching power supply as described in the second embodiment, wherein the DC bus is connected to the switching power supply. [Effects of the Invention]

[0009] Embodiments of this disclosure provide a connector, a switching power supply, and a communication power supply system, the connector comprising a first contact, a second contact, a capacitor precharge circuit, and a control circuit. The first contact is detachably connected to the second contact and connected to the output terminal of a power supply, the second contact is connected to a DC bus, both the capacitor precharge circuit and the control circuit are provided on the first contact, the capacitor precharge circuit is connected to the capacitor circuit, and the control circuit controls the on and off of the power supply. Thus, in the step of inserting the first contact into the second contact, the DC bus charges the capacitor circuit via the capacitor precharge circuit before the control circuit turns on the power supply, and in the step of withdrawing the first contact from the second contact, the control circuit turns off the power supply before the connection between the power supply and the DC bus is disconnected. Compared to related technologies, embodiments of this disclosure can reduce the power consumption of the switching power supply because there is no need to separately provide a current limiting resistor on the output capacitor of the switching power supply, and at the same time, the structure of the switching power supply can be simplified because there is no need to separately provide a current detection device and an arc extinguishing structure. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example of the circuit configuration of a communication power supply system according to an embodiment of the present disclosure. [Figure 2] This figure shows an example of a typical circuit configuration for a communication power supply system. [Figure 3] This figure shows an example of the circuit configuration of a switching power supply according to an embodiment of the present disclosure. [Figure 4] This figure shows an example of a switching power supply circuit configuration. [Figure 5] This figure shows an example of the circuit configuration of a connector according to the embodiment of the present disclosure. [Figure 6] This figure shows an example of power supply for a control circuit. [Figure 7] This figure shows an example of the circuit configuration for the first and second contacts. [Figure 8] It is a diagram showing an example of the circuit configuration of a capacitor precharge circuit. [Figure 9] It is a diagram showing an example of the circuit configuration of a control circuit. [Figure 10] It is a diagram showing an example of the circuit configuration of an imposition detection circuit. [Figure 11] It is a diagram showing an example of the circuit configuration of a signal processing circuit. [Figure 12] It is a diagram showing another circuit configuration of a signal processing circuit. [Figure 13] It is a diagram showing an example of the circuit configuration of a signal filter circuit. [Figure 14] It is a diagram showing an example of an exemplary circuit configuration of a connector according to an embodiment of the present disclosure.

Mode for Carrying Out the Invention

[0011] Hereinafter, while referring to the drawings in the embodiments of this specification, the technical means in the embodiments of this specification will be clearly and completely described. Obviously, the described embodiments are only some of the embodiments of this specification, not all of them. Based on the embodiments of this specification, all other embodiments obtained on the premise that those skilled in the art do not perform creative labor all belong to the protection scope of this specification.

[0012] The flowcharts shown in the drawings are merely illustrative explanations and do not necessarily include all the contents and operations / steps, nor are they necessarily executed in the described order. For example, some operations / steps can be decomposed, combined or partially combined, so the actual execution order may vary depending on the actual situation.

[0013] Hereinafter, several embodiments of this specification will be described in detail while referring to the drawings. The following examples and the features in the examples can be combined with each other as long as they do not conflict.

[0014] As shown in FIG. 1, the communication power supply system according to an embodiment of the present disclosure may include a switching power supply 10 and a DC bus 20, and the switching power supply 10 is connected to the DC bus 20. In this embodiment, the number of switching power supplies 10 may be one or more, and specifically, it can be reasonably set according to the actual situation. Exemplarily, as shown in FIG. 2, the number of switching power supplies 10 may be more than one, and the second contacts of each switching power supply 10 are respectively connected to the DC bus 20. As can be understood, by collecting the power output from each switching power supply 10 to the DC bus 20, the DC bus 20 can provide operating power to one or more power-consuming devices.

[0015] As shown in FIG. 3, the switching power supply 10 according to an embodiment of the present disclosure may include a power supply device 110 and a connector 120. In this embodiment, the power supply device 110 can output DC power, and the on and off of the power supply device 110 are controllable. For example, the power supply device may include one or more switch transistors. Since the switch transistors are controllable, the on and off of the power supply device 110 are also controllable. The connector 120 is connected to the output end of the power supply device 110 and also connected to the DC bus 20. As can be seen from this, the DC power output by the power supply device 110 is supplied to the DC bus 20 through the connector 120. Exemplarily, as shown in FIG. 4, the power supply device 110 may include an AC / DC rectifier. The input end of the AC / DC rectifier may be connected to an AC power supply, and the output end may be connected to the connector 120. In this way, when the power supply device 110 is turned on, the AC power output from the AC power supply is rectified into DC power and supplied to the DC bus 20 through the connector 120.

[0016] As shown in Figure 5, the connector 120 according to the embodiment of this disclosure may include a first contact 121, a second contact 122, a capacitor precharge circuit 123, and a control circuit 124. In this embodiment, a capacitor circuit 111 is provided at the output terminal of the power supply 110, that is, the capacitor circuit 111 is connected in parallel to the output terminal of the power supply 110, so that the capacitor circuit 111 can ensure the stability of the output of the switching power supply 10, thereby allowing the switching power supply 10 to output better power.

[0017] Since the first contact 121 and the second contact 122 are detachably connected, the switching power supply 10 can be hot-plugged and plugged in, the first contact 121 is connected to the output terminal of the power supply unit 110, and the second contact 122 is connected to the DC bus 20. In one embodiment, the second contact 122 may be fixedly mounted relative to the DC bus 20, thereby facilitating the insertion and removal of the first contact 121. Exemplarily, the first contact 121 and the second contact 122 may be a plug and an outlet, respectively, and the outlet may be fixedly mounted relative to the DC bus 20.

[0018] The capacitor precharge circuit 123 and the control circuit 124 may both be provided on the first contact 121. The capacitor precharge circuit 123 is connected to the capacitor circuit 111, and the control circuit 124 controls the on and off of the power supply 110. For example, the control circuit 124 may be connected to the switch transistor in the power supply 110. Therefore, the control circuit 124 may turn on the power supply 110 in a manner that controls the switch transistor to turn on, and similarly, it may turn off the power supply 110 in a manner that controls the switch transistor to turn off.

[0019] In this embodiment, during the process of inserting the first contact 121 into the second contact 122 (i.e., live insertion), the DC bus 20 charges the capacitor circuit 111 via the capacitor precharge circuit 123, and then the control circuit 124 controls the power supply 110 to turn on. Specifically, before live insertion, the capacitor circuit is not charged, so the voltage across the switching power supply is low. At this time, if the power supply is turned on, the voltage difference between the capacitor circuit and the DC bus is too large, causing an arc discharge. Therefore, in this embodiment, in the step of inserting the first contact 121 into the second contact 122, the capacitor precharge circuit 123 is connected to the DC bus 20 first, so that the DC bus 20 charges the capacitor circuit 111 first. As can be understood, after charging, the voltage across the capacitor circuit 111 is close to the voltage of the DC bus. After the capacitor circuit 111 is charged, the control circuit 124 controls the power supply 110 to turn on. At this time, since the voltage of the capacitor circuit 111 is close to the voltage of the DC bus 20, the occurrence of arc discharge can be avoided. Also, in the step of withdrawing the first contact 121 from the second contact 122 (i.e., hot-swapping), the control circuit 124 controls the power supply 110 to turn off first before the connection between the power supply 110 and the DC bus 20 is disconnected. Specifically, when a switching power supply performs hot-swapping, arc discharge occurs when the connection between the power supply and the DC bus is disconnected. Therefore, in this embodiment, in the step of withdrawing the first contact 121 from the second contact 122, the control circuit 124 controls the power supply 110 to be turned off before the connection between the power supply 110 and the DC bus 20 is disconnected, thereby avoiding the occurrence of arc discharge. Consequently, when the contacts according to this embodiment are used in a switching power supply, the switching power supply not only supports hot insertion and removal but can also avoid the occurrence of arc discharge during hot insertion and removal, thereby effectively reducing safety accidents caused by sparks from arc discharge.

[0020] Therefore, as can be seen from the above explanation, this embodiment does not require a separate current limiting resistor to be provided in the output capacitor of the switching power supply (i.e., the capacitor circuit 111) compared to related technologies, thus reducing the power consumption of the switching power supply. At the same time, it does not require a separate current detection device and arc extinguishing structure, thus simplifying the structure of the switching power supply.

[0021] In one embodiment, as shown in Figure 6, the control circuit 124 may be connected to the capacitor circuit 111 so as to provide operating power to the control circuit 124 after the capacitor circuit 111 has been charged. Specifically, if the DC bus 20 is unable to charge the capacitor circuit 111 due to some abnormality (e.g., poor contact or broken wire) during the process of inserting the first contact 121 into the second contact 122, the control circuit 124 controlling to turn on the power supply 110 may cause an arc discharge. In this embodiment, if the capacitor circuit 111 is supplying power to the control circuit 124, and the aforementioned abnormal situation occurs, the capacitor circuit 111 is not charged and therefore cannot supply power to the control circuit 124, thereby avoiding turning on the power supply 110 and thus avoiding the occurrence of an arc discharge. Also, if there is no abnormality, the DC bus 20 can charge the capacitor circuit 111, in other words, the capacitor circuit 111 can normally supply power to the control circuit 124, and thus the control circuit 124 does not affect the control of the power supply 110 during the insertion process. For example, the capacitor circuit 111 can supply power to the control circuit 124 via an auxiliary circuit, for instance, via a boost step-down circuit.

[0022] In one embodiment, the first contact 121 is provided with a plurality of first fittings, and the second contact 122 is provided with second fittings corresponding to each first fitting, and as can be understood, the first fittings are detachably connected to the second fittings, and exemplary, the first fittings and second fittings may be a metal plug blade and a metal blade holder, respectively. In one embodiment, the number of first fittings and second fittings may be the same, and one first fitting corresponds to one second fitting, i.e., a one-to-one correspondence.

[0023] As shown in Figure 7, the plurality of first fittings may include a power-plus fitting 1211, a power-ground fitting 1212, a pre-charge fitting 1213, and an in-position fitting 1214. The power-plus fitting 1211 is connected to the positive output terminal of the power supply unit 110, the power-ground fitting 1212 is connected to the negative output terminal of the power supply unit 110, and accordingly, the second fitting 1221 corresponding to the power-plus fitting 1211 is connected to the positive terminal of the DC bus 20, the second fitting 1212 corresponding to the power-ground fitting 1212 is connected to the negative terminal of the DC bus 20, the pre-charge fitting 1213 is connected to the capacitor pre-charge circuit 123, and the in-position fitting 1214 is connected to the control circuit 124. In one embodiment, the second fitting 1223 corresponding to the pre-charge fitting 1213 may be connected to the second fitting 1221, i.e., connected to the positive terminal of the DC bus 20.

[0024] In this embodiment, the length of the in-position fitting 1214 is shorter than the length of the power-plus fitting 1211, and the length of the power-plus fitting 1211 is shorter than the length of the power-ground fitting 1212 and the pre-charge fitting 1213, respectively. Thus, in the step of inserting the first contact 121 into the second contact 122, first the power-ground fitting 1212 and the pre-charge fitting 1213 contact their respective second fittings, then the power-plus fitting 1211 contacts its corresponding second fitting, and finally the in-position fitting 1214 contacts its corresponding second fitting. Conversely, in the step of withdrawing the first contact 121 from the second contact 122, first the in-position fitting 1214 moves away from its corresponding second fitting, then the power-plus fitting 1211 moves away from its corresponding second fitting, and finally the power-ground fitting 1212 and the pre-charge fitting 1213 move away from their respective second fittings. In one embodiment, the length of the power-ground fitting 1212 may be equal to the length of the pre-charge fitting 1213.

[0025] As a result, in the process of inserting the first contact 121 into the second contact 122, when the pre-charge fitting 1213 contacts the second fitting 1223 and the power ground fitting 1212 contacts the second fitting 1222, the DC bus 20 and the capacitor circuit 111 form a charging circuit, thereby charging the capacitor circuit 111 with the DC bus 20. Subsequently, when the in-position fitting 1214 contacts the second fitting 1224, the control circuit 124 controls the power supply 110 to turn on. Specifically, in the live-insertion process, the pre-charge fitting 1213 and the power ground fitting 1212 first make contact with their respective second fittings, and since the DC bus 20 is outputting power (for example, another switching power supply transmits power to the DC bus 20), the DC bus 20 can charge the capacitor circuit 111 first (i.e., the DC bus 20 supplies power to the capacitor circuit 111). As can be seen from the diagram, the charging circuit is the positive terminal of the DC bus 20 - second fitting 1223 - pre-charge fitting 1213 - capacitor pre-charge circuit 123 - capacitor circuit 111 - power ground fitting 1212 - second fitting 1222 - negative terminal of the DC bus 20. Next, the power plus fitting 1211 makes contact with the second fitting 1221, and then the power supply relationship between the capacitor circuit 111 and the DC bus 20 is established. When the circuit is restored to normal, that is, when the capacitor circuit 111 supplies power to the DC bus 20, it can be seen that if the length of the power-plus contact 1211 is smaller than the length of the power-ground contact 1212 and the pre-charge contact 1213, respectively, it can be ensured that the capacitor circuit 111 is charged first. Finally, when the in-position contact 1214 contacts the second contact 1224, and the length of the in-position contact 1214 is smaller than the length of the power-plus contact 1211, a connection already exists between the power supply 110 and the DC bus 20, and at this time the voltage of the capacitor circuit 111 is close to the voltage of the DC bus 20, the control circuit 124 can control the power supply 110 to turn on, thus avoiding the occurrence of arc discharge. It can also be seen that after turning on the power supply 110, the switching power supply 10 can continue to supply power to the DC bus 20.

[0026] Furthermore, in the process of withdrawing the first contact 121 from the second contact 122, if the in-position fitting 1214 separates from the second fitting 1224, the control circuit 124 controls the power supply 110 to turn off. Specifically, in the hot-swapping process, the in-position fitting 1214 separates from the second fitting 1224 first, and since the length of the in-position fitting 1214 is shorter than the length of the power-plus fitting 1211, a connection relationship still exists between the power supply 110 and the DC bus 20. Thus, the control circuit 124 can control the power supply 110 to turn off, and similarly, the occurrence of arc discharge can be avoided.

[0027] In one embodiment, as shown in Figure 8, the capacitor precharge circuit 123 includes a diode D and a current limiting resistor Rc, wherein the anode of the diode D is connected to the precharge fitting 1213 and the cathode is connected to the capacitor circuit 111, and the current limiting resistor Rc is connected between the capacitor circuit 111 and the precharge fitting 1213. Specifically, the diode D can prevent a circuit from being formed between the precharge fitting 1213 and the power-plus fitting 1211, and the current limiting resistor Rc can limit the charging current flowing through the capacitor circuit 111.

[0028] In one embodiment, as shown in Figure 9, the control circuit 124 may include a controller 1241 and an in-position detection circuit 1242, the in-position detection circuit 1242 being connected between the in-position fitting 1214 and the controller 1241, the controller 1241 may include a microcontroller unit (MCU) and be connected to the control terminal of the power supply 110. As a result, when the in-position fitting 1214 comes into contact with the second fitting 1224, the in-position detection circuit 1242 transmits a first electrical signal to the controller 1241, and when the in-position fitting 1214 moves away from the second fitting 1224, the in-position detection circuit 1242 transmits a second electrical signal to the controller 1241, thereby controlling the controller 1241 to turn on or off the power supply 110 when it detects that the electrical signal transmitted by the in-position detection circuit 1242 satisfies a predetermined change. Specifically, during the live-wire insertion process, when the relationship between the in-position fitting 1214 and the second fitting 1224 changes from separation to contact, the electrical signal transmitted from the in-position detection circuit 1242 to the controller 1241 changes from the second electrical signal to the first electrical signal. Therefore, when the controller 1241 detects that the electrical signal transmitted from the in-position detection circuit 1242 satisfies this predetermined change, it can determine that the in-position fitting 1214 has made contact with the second fitting 1224, and thereby control the power supply 110 to turn on. Conversely, during the hot-swapping process, when the relationship between the in-position fitting 1214 and the second fitting 1224 changes from contact to separation, the electrical signal transmitted from the in-position detection circuit 1242 to the controller 1241 changes from the first electrical signal to the second electrical signal. Therefore, when the controller 1241 detects that the electrical signal transmitted from the in-position detection circuit 1242 satisfies this predetermined change, it can determine that the in-position fitting 1214 has separated from the second fitting 1224, and thereby control the power supply 110 to turn off.

[0029] In one embodiment, as shown in Figure 10, the in-position detection circuit 1242 may include a signal source circuit VCC and a signal processing circuit 1243. The signal source circuit VCC may include, but is not limited to, the power output circuit of the controller 1241, and is connected to the signal processing circuit 1243. The signal processing circuit 1243 is connected between the in-position fitting 1214 and the controller 1241, and the second fitting 1224 is connected to the second fitting 1222. As a result, when the in-position fitting 1214 comes into contact with the second fitting 1224, the signal source circuit VCC transmits a first electrical signal to the controller 1241 via the signal processing circuit 1243. Conversely, when the in-position fitting 1214 moves away from the second fitting 1224, the signal source circuit VCC transmits a second electrical signal to the controller 1241 via the signal processing circuit 1243.

[0030] For example, as shown in Figure 11, the signal processing circuit 1243 may include a first resistor R1 and a second resistor R2, wherein the first resistor R1 has its first end connected to the in-position fitting 1214 and its second end connected to the controller 1241, and the second resistor R2 is connected between the signal source circuit VCC and the second end of the first resistor R2. Thus, when the in-position fitting 1214 is in contact with the second fitting 1224, the signal source circuit VCC outputs two electrical signals via the second resistor R2. One is output to the controller 1241, and the other is output to ground via the first resistor R1 (the electrical circuit is VCC-R2-R1-1214-1224-1222-1212). As can be seen from this, the first electrical signal that the signal source circuit VCC outputs to the controller 1241 is voltage-divided by the other circuit, so the first electrical signal is considered to be a low-level signal. When the in-position fitting 1214 is separated from the second fitting 1224, the signal source circuit VCC outputs a second electrical signal directly to the controller 1241 via the second resistor R2. In this case, the voltage is not divided, so the second electrical signal is considered to be a high-level signal.

[0031] For example, as shown in Figure 12, the signal processing circuit 1243 may include a third resistor R3, a fourth resistor R4, and a switch transistor Q, the switch transistor Q may include a transistor and a MOS transistor, the control terminal of the switch transistor Q is connected to the in-position fitting 1214 via the third resistor R3, the first switch terminal is connected to the signal source circuit VCC via the fourth resistor R4, and the second switch terminal is grounded. Thus, when the in-position fitting 1214 is in contact with the second fitting 1224, a connection exists between the control terminal of the switch transistor Q and the power ground fitting 1212 (for the specific principle, please refer to the explanation above). As a result, current is input to the control terminal of the switch transistor Q, meaning the switch transistor Q is in the ON state. Therefore, the electrical signal output by the signal source circuit VCC via the fourth resistor R4 is mainly input to ground, meaning the first electrical signal output by the signal source circuit VCC to the controller 1241 is considered to be a low-level signal. When the in-position fitting 1214 is separated from the second fitting 1224, there is no current input to the control terminal of the switch transistor Q, meaning the switch transistor Q is in the OFF state. Therefore, the electrical signal output by the signal source circuit VCC via the fourth resistor R4 is mainly input to the controller 1241, meaning the first electrical signal output by the signal source circuit VCC to the controller 1241 is considered to be a high-level signal.

[0032] In one embodiment, as shown in Figure 13, the in-position detection circuit 1242 may be connected to the controller 1241 via a signal filter circuit 1244, and the signal filter circuit 1244 may include a filter, so as can be understood, a better electrical signal can be output to the controller 1244 via the signal filter circuit 1244.

[0033] As described above, Figure 14 is a diagram showing an example of an exemplary circuit structure of a connector according to an embodiment of the present disclosure, and for specific connection relationships, please refer to the drawing, as a detailed explanation is omitted here. In this example, in the step of inserting the first contact 121 into the second contact 122, the pre-charge fitting 1213 and the power ground fitting 1212 first contact the corresponding second fittings, and the DC bus 20 charges the capacitor circuit 111 first. As can be understood, power can be supplied to the controller after the capacitor circuit 111 is charged. After the in-position fitting 1214 contacts the second fitting 1224, the controller controls the power supply 110 to turn on by detecting that the electrical signal satisfies a predetermined change (i.e., changes from a high level to a low level). As can be understood, since the length of the in-position fitting 1214 is shorter than the length of the power plus fitting 1211, a connection relationship already exists between the power supply 110 and the DC bus 20, and at this time, the voltage of the capacitor circuit 111 is close to the voltage of the DC bus 20, so the occurrence of arc discharge can be avoided. In the process of pulling the first contact 121 away from the second contact 122, the in-position fitting 1214 is the first to separate from the second fitting 1224, and the controller controls the power supply 110 to turn off by detecting that the electrical signal satisfies a predetermined change (i.e., the low level changes to a high level). As can be understood, since the length of the in-position fitting 1214 is shorter than the length of the power-plus fitting 1211, a connection relationship still exists between the power supply 110 and the DC bus 20 at this time, and the occurrence of arc discharge can be avoided.

[0034] The foregoing are merely specific embodiments of the present disclosure, and the scope of protection of the present disclosure is not limited thereto. A person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed herein, and all such modifications or substitutions should fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A first contact connected to the output terminal of a power supply, wherein a capacitor circuit is provided at the output terminal of the power supply, A second contact is detachably connected to the first contact and connected to the DC bus of the communication power system, A capacitor precharge circuit is provided in the first contact and connected to the capacitor circuit, The first contact includes a control circuit provided on the first contact and connected to the power supply, which controls the on and off of the power supply, In the step of inserting the first contact into the second contact, the DC bus charges the capacitor circuit via the capacitor precharge circuit, and then the control circuit controls the power supply to turn on; and in the step of withdrawing the first contact from the second contact, the control circuit controls the power supply to turn off before the connection between the power supply and the DC bus is disconnected. The control circuit is connected to the capacitor circuit via a connector, so as to provide operating power to the control circuit after the capacitor circuit has been charged.

2. The first contact is provided with a plurality of first fittings, and the second contact is provided with a second fitting corresponding to each of the first fittings. The plurality of first fittings include a power plus fitting, a power ground fitting, a precharge fitting, and an in-position fitting, wherein the length of the in-position fitting is less than the length of the power plus fitting, and the length of the power plus fitting is less than the length of the power ground fitting and the length of the precharge fitting, respectively. The power positive connector is connected to the positive output terminal of the power supply unit, and the power ground connector is connected to the negative output terminal of the power supply unit. Since the pre-charge fitting is connected to the capacitor pre-charge circuit, in the step of inserting the first contact into the second contact, when the pre-charge fitting contacts the corresponding second fitting and the power ground fitting contacts the corresponding second fitting, the DC bus and the capacitor circuit form a charging circuit, thereby the DC bus charges the capacitor circuit. The connector according to claim 1, wherein the in-position fitting is connected to the control circuit, and in the step of inserting the first contact into the second contact, the control circuit controls the power supply to turn on when the in-position fitting comes into contact with the corresponding second fitting, and in the step of withdrawing the first contact from the second contact, the control circuit controls the power supply to turn off when the in-position fitting moves away from the corresponding second fitting.

3. The connector according to claim 2, wherein the capacitor precharge circuit includes a diode and a current limiting resistor, the diode having its anode connected to the precharge fitting and its cathode connected to the capacitor circuit, and the current limiting resistor connected between the capacitor circuit and the precharge fitting.

4. The control circuit includes a controller and an in-position detection circuit, the in-position detection circuit is connected between the in-position fitting and the controller, and the controller is connected to the control terminal of the power supply device. When the in-position fitting comes into contact with the corresponding second fitting, the in-position detection circuit transmits a first electrical signal to the controller, and when the in-position fitting moves away from the corresponding second fitting, the in-position detection circuit transmits a second electrical signal to the controller The connector according to claim 2, wherein the connector transmits a signal to the power supply, and the controller controls the power supply to turn on or off when it detects that the electrical signal transmitted by the in-position detection circuit satisfies a predetermined change.

5. The second fitting corresponding to the in-position fitting is connected to the second fitting corresponding to the power ground fitting. The in-position detection circuit includes a signal source circuit and a signal processing circuit, the signal source circuit is connected to the signal processing circuit, and the signal processing circuit is connected between the in-position fitting and the controller. The connector according to claim 4, wherein when the in-position fitting comes into contact with the corresponding second fitting, the signal source circuit transmits a first electrical signal to the controller via the signal processing circuit, and when the in-position fitting moves away from the corresponding second fitting, the signal source circuit transmits a second electrical signal to the controller via the signal processing circuit.

6. The signal processing circuit includes a first resistor and a second resistor, wherein the first resistor has its first end connected to the in-position fitting and its second end connected to the controller, and the second resistor is connected between the signal source circuit and the second end of the first resistor, or The connector according to claim 5, wherein the signal processing circuit includes a third resistor, a fourth resistor, and a switch transistor, the switch transistor having a control terminal connected to the in-position fitting via the third resistor, a first switch terminal connected to the signal source circuit via the fourth resistor, and a second switch terminal grounded.

7. The connector according to claim 4, wherein the in-position detection circuit is connected to the controller via a signal filter circuit.

8. A switching power supply comprising a power supply unit and a connector according to any one of claims 1 to 7, wherein the output terminal of the power supply unit is connected to the connector.

9. A communication power supply system comprising a DC bus and a switching power supply as described in claim 8, wherein the DC bus is connected to the switching power supply.

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