Power supply circuit and network configuration terminal device

Abstract

The application discloses a power supply circuit and a network distribution terminal device, and relates to the technical field of network distribution terminals, wherein the power supply circuit comprises a power supply module, a voltage boosting module and a backup power supply circuit, the voltage boosting module is connected with the power supply module; the backup power supply circuit comprises a first super capacitor, a charging resistor and a first discharging diode, the first end of the charging resistor is connected with the power supply module and the voltage boosting module respectively, the second end of the charging resistor is connected with the first end of the first super capacitor and the input end of the first discharging diode respectively, the second end of the first super capacitor is used for connecting a first ground wire, and the output end of the first discharging diode is connected with the power supply module and the voltage boosting module respectively; the first super capacitor is arranged, so that when voltage drop occurs and the power supply module stops power supply, the first super capacitor can continue to supply power instead of the power supply module, so as to ensure the stability of power supply of the network distribution terminal, reduce the risk of equipment damage, and thus reduce the cost of equipment maintenance.

Description

Technical Field

[0001] This application relates to the field of data transmission technology, and in particular to a power supply circuit and a distribution network terminal device. Background Technology

[0002] In existing technologies, distribution network terminal equipment, such as switchgear terminal equipment, feeder terminal equipment, and distribution transformer terminal equipment, often face the problem of grid voltage dips. Voltage dips refer to a sudden drop in grid voltage that lasts for a very short time and then recovers to normal levels, but the voltage is not completely interrupted during the process. Voltage dips can lead to unstable power supply to distribution network terminal equipment, resulting in power supply interruptions, which may cause damage to the equipment, affect its reliability and stability, and also increase the cost of equipment maintenance. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a power supply circuit and distribution network terminal equipment that can use a first supercapacitor to continue supplying power for a period of time when a voltage drop occurs and the power module stops supplying power, until the power module resumes power supply, thereby ensuring the stability of the power supply to the distribution network terminal equipment and reducing equipment maintenance costs.

[0004] A power supply circuit according to a first aspect embodiment of this application includes a power supply module, a boost module, and a backup power supply circuit. The boost module is connected to the power supply module and is used to boost the voltage input to the power supply module. The boost module is also used to output the boosted voltage to the system power supply of the distribution network terminal. The backup power supply circuit includes a first supercapacitor, a charging resistor, and a first discharging diode. The first end of the charging resistor is connected to the power supply module and the boost module, respectively. The second end of the charging resistor is connected to the first end of the first supercapacitor and the input end of the first discharging diode, respectively. The second end of the first supercapacitor is used to connect to a first ground wire. The output end of the first discharging diode is connected to the power supply module and the boost module, respectively. The backup power supply circuit is used to supply power to the boost module in place of the power supply module when the power supply module stops supplying power to the boost module.

[0005] The power supply circuit according to the embodiments of this application has at least the following beneficial effects: by setting a power supply module to provide the required voltage to the power supply circuit, and by setting a boost module to boost the voltage input to the power supply module, the output voltage is ensured to be stable, so that even if voltage loss occurs during transmission, the voltage finally output to the distribution network terminal equipment can still be within a reasonable range. By setting a backup power supply circuit, it can replace the power supply module to continue supplying power when the power supply module stops supplying power. That is, when the power supply module is in the power supply state, while supplying power to the boost module, the power supply module also charges the first supercapacitor through the charging resistor. When a voltage drop occurs, causing the power supply module to stop supplying power to the boost module, the first supercapacitor switches from the charging state to the discharging state, and then continues to discharge to the boost module, so that the boost module can continue to boost the voltage and output the boosted voltage to the system power supply of the distribution network terminal. This avoids the situation where the power supply to the distribution network terminal system is interrupted due to voltage drop, improves the reliability and stability of the distribution network terminal, and reduces the maintenance cost of the distribution network terminal. The setting of the first discharge diode helps to avoid the current flowing back to the first supercapacitor, which could damage the first supercapacitor, and further reduces the maintenance cost.

[0006] According to some embodiments of this application, the backup power supply circuit further includes a second discharge diode, the input terminal of which is connected to the second terminal of the charging resistor and the first terminal of the first supercapacitor, respectively, and the output terminal of the second discharge diode is connected to the power module and the boost module, respectively.

[0007] According to some embodiments of this application, the power module includes a protection circuit and a power conversion circuit. The protection circuit is connected to the power conversion circuit, and the power conversion circuit is also connected to the boost module and the backup power supply circuit. The protection circuit is used to output the input voltage to the power conversion circuit, and the power conversion circuit is used to convert the input voltage into the required output voltage. The power conversion circuit is also used to output the output voltage to the boost module and the backup power supply circuit.

[0008] According to some embodiments of this application, the protection circuit includes a resettable fuse, a first varistor, a first inductor, a first safety capacitor, a second safety capacitor, a third safety capacitor, a fourth safety capacitor, and a common-mode filter. The first end of the resettable fuse is connected to the positive terminal of the input power supply. The second end of the resettable fuse is connected to the first end of the first inductor and the first end of the first varistor. The second end of the first varistor is connected to the negative terminal of the input power supply. The second end of the first inductor is connected to the first end of the first safety capacitor and the first input terminal of the common-mode filter. The second end of the first safety capacitor is connected to the negative terminal of the input power supply and the second input terminal of the common-mode filter. The first output terminal of the common-mode filter is connected to a second ground wire through the third safety capacitor. The second output terminal of the common-mode filter is connected to the second ground wire through the second safety capacitor. The first end of the fourth safety capacitor is connected to the first ground wire, and the second end of the fourth safety capacitor is connected to the second ground wire. The power conversion circuit is also connected to the first and second output terminals of the common-mode filter.

[0009] According to some embodiments of this application, the power conversion circuit includes a power conversion module, a transient voltage suppressor, a first electrolytic capacitor, a first filter capacitor, and a second filter capacitor. The input terminal of the power conversion module is connected to the protection circuit. The first output terminal of the power conversion module is connected to the first terminal of the transient voltage suppressor, the first terminal of the first electrolytic capacitor, the first terminal of the first filter capacitor, the first terminal of the second filter capacitor, and the first terminal of the resettable fuse. The second terminals of the transient voltage suppressor, the first electrolytic capacitor, the first filter capacitor, and the second filter capacitor are all connected to the first ground wire.

[0010] According to some embodiments of this application, the boost module includes a boost chip and a compensation circuit. The compensation circuit includes a first capacitor, a second capacitor, and a first resistor. The first pin of the boost chip is connected to the power module. The second pin of the boost chip is connected to the first terminal of the first capacitor and the first terminal of the second capacitor, respectively. The second terminal of the first capacitor is connected to the first terminal of the first resistor. The second terminals of the first resistor and the second terminals of the second capacitor are both connected to the first ground wire. The third pin of the boost chip is used to output the boosted voltage to the system power supply of the distribution network terminal.

[0011] According to some embodiments of this application, a delay circuit is also included. The boost module is connected to the system power supply of the distribution network terminal through the delay circuit. The delay circuit is used to delay the time when the output voltage of the boost module is output to the system power supply of the distribution network terminal.

[0012] According to some embodiments of this application, the delay circuit includes a voltage detector, a transistor, a second resistor, a third capacitor, a fourth capacitor, and a fifth capacitor. The input pin of the voltage detector is connected to the power supply module. The output pin of the voltage detector is connected to the fourth pin of the boost chip and the first end of the second resistor. The second end of the second resistor is connected to the gate of the transistor and the first end of the fifth capacitor. The second end of the fifth capacitor is connected to the source of the transistor and the first ground line. The drain of the transistor is connected to the first end of the third capacitor, the first end of the fourth capacitor, and the third ground line. The second end of the third capacitor is connected to the third pin of the boost chip and the system power supply of the distribution terminal. The second end of the fourth capacitor is connected to the third pin of the boost chip and the system power supply of the distribution terminal.

[0013] According to some embodiments of this application, the boost module further includes a third filter capacitor, a first ferrite bead, and a second ferrite bead. The third pin of the boost chip is connected to the first end of the third filter capacitor, the first end of the first ferrite bead, and the first end of the second ferrite bead, respectively. The second end of the third filter capacitor is connected to the first ground wire. The second ends of the first ferrite bead and the second ends of the second ferrite bead are both used to connect to the system power supply of the distribution network terminal.

[0014] The device according to a second aspect embodiment of this application includes: The power supply circuit of the first aspect of this application.

[0015] The device according to the embodiments of this application has at least the following beneficial effects: by setting a power supply module to provide the required voltage to the power circuit, and by setting a boost module to boost the voltage input to the power supply module, the stability of the output voltage is ensured, so that even if voltage loss occurs during transmission, the voltage finally output to the distribution network terminal equipment can still be within a reasonable range. Furthermore, by setting a backup power supply circuit, it can replace the power supply module to continue supplying power when the power supply module stops supplying power. That is, when the power supply module is in the power supply state, while supplying power to the boost module, it also charges the first supercapacitor through the charging resistor; and when a voltage drop occurs, causing the power supply module to stop supplying power to the boost module, the first supercapacitor then... The circuit switches from charging to discharging, continuously discharging into the boost module, allowing the boost module to continue boosting the voltage and outputting the boosted voltage to the distribution network terminal's system power supply. This prevents power outages caused by voltage drops, improving the reliability and stability of the distribution network terminal and reducing its maintenance costs. Furthermore, the inclusion of a first discharge diode prevents reverse current flow back to the first supercapacitor, thus avoiding damage and further reducing maintenance costs. By introducing the power supply circuit of this application, the distribution network terminal equipment can effectively avoid voltage drops, reducing equipment damage and maintenance costs.

[0016] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a power supply circuit excluding the power supply module, according to an embodiment of this application. Figure 2 A schematic diagram of the power module when DC power is input to this application; Figure 3 This is a schematic diagram of the power module when AC power is input for this application. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying 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 with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] Currently, in power systems, distribution network terminal equipment, such as distribution unit (DTU), feeder unit (FTU), and transformer unit (TTU), frequently faces the problem of grid voltage dips. A voltage dip refers to a sudden drop in grid voltage, lasting for a very short time, followed by a return to normal levels, but without a complete voltage interruption. This phenomenon can be caused by various factors, such as the starting of large motors, lightning strikes, and line faults. Voltage dips can lead to unstable power supply to distribution network terminal equipment, even damaging the equipment, affecting the normal operation of the power system, and increasing equipment maintenance costs.

[0023] Based on this, this application proposes a power supply circuit and distribution network terminal equipment, which can replace the power supply module to continue supplying power when the power supply module stops supplying power through the first supercapacitor, thereby avoiding the power supply interruption of the distribution network terminal system due to voltage drop, thus stabilizing the power supply to the distribution network terminal, reducing the risk of equipment damage, ensuring the normal operation of the power system, and also reducing the cost of equipment maintenance.

[0024] It is understood that the power supply circuit of this application embodiment includes a power supply module, a boost module, and a backup power supply circuit. The boost module is connected to the power supply module and is used to boost the voltage input to the power supply module. The boost module is also used to output the boosted voltage to the system power supply of the distribution network terminal. The backup power supply circuit includes a first supercapacitor EC5, a charging resistor R83, and a first discharge diode D34. The first end of the charging resistor R83 is connected to the power supply module and the boost module respectively. The second end of the charging resistor R83 is connected to the first end of the first supercapacitor EC5 and the input end of the first discharge diode D34 respectively. The second end of the first supercapacitor EC5 is used to connect to the first ground wire GND1. The output end of the first discharge diode D34 is connected to the power supply module and the boost module respectively. The backup power supply circuit is used to supply power to the boost module in place of the power supply module when the power supply module stops supplying power to the boost module.

[0025] The beneficial effects of the power supply circuit in this application embodiment can be manifested as follows: by setting a power supply module to provide the required voltage to the power supply circuit, and by setting a boost module to boost the voltage input to the power supply module, the output voltage is ensured to be stable, so that even if voltage loss occurs during transmission, the voltage finally output to the distribution network terminal equipment can still be within a reasonable range. Furthermore, by setting a backup power supply circuit, it can replace the power supply module to continue supplying power when the power supply module stops supplying power. That is, when the power supply module is in the power supply state, while supplying power to the boost module, it also charges the first supercapacitor EC5 through the charging resistor R83; and when an accident occurs... When a voltage drop causes the power module to stop supplying power to the boost module, the first supercapacitor EC5 switches from charging to discharging, continuously discharging to the boost module. This allows the boost module to continue boosting the voltage and outputting the boosted voltage to the distribution network terminal's system power supply. This prevents power outages caused by voltage drops, improving the reliability and stability of the distribution network terminal and reducing its maintenance costs. Furthermore, the inclusion of a first discharge diode prevents reverse current flow back to the first supercapacitor EC5, thus avoiding damage and further reducing maintenance costs.

[0026] For example, in some embodiments, reference is made to Figure 1In this embodiment, the input terminal of the power module is connected to an external power source, allowing the external power source to provide input power to the power module. The power module then converts the input voltage from the external power source into the required voltage value. The output voltage of the power module is then output to the boost module for voltage boosting. This ensures that even if voltage loss occurs during transmission, the final voltage will remain within a suitable range. For example, if the power module outputs 5V, the boost module boosts it to 5.15V, resulting in a 0.15V redundancy between the boosted voltage and the voltage required by the distribution network terminal system power supply. Since the output voltage to the distribution network terminal system power supply needs to be above 5V, even if voltage loss occurs during the boost circuit's output to the distribution network terminal system power supply, as long as the voltage loss is within 0.15V, the final output voltage to the distribution network terminal system power supply will be within a certain range. This is effective, ensuring the stable operation of the distribution network terminal. The combination of charging resistor R83 and the first supercapacitor EC5 allows the power module to charge the boost module while simultaneously charging the first supercapacitor EC5, enabling EC5 to store energy. This allows EC5 to switch from charging to discharging when a voltage drop occurs and the power module can no longer supply power to the boost module, thus continuing to supply power until the voltage recovers. During this process, the voltage output from the boost module to the distribution network terminal system remains stable, ensuring a stable power supply to the distribution network terminal and reducing the risk of damage to the equipment due to voltage drops, thereby lowering equipment maintenance costs. By setting the first discharge diode D34, current backflow to the first supercapacitor EC5 during discharge is avoided, which could potentially damage the first supercapacitor EC5 and increase circuit maintenance costs. The first discharge diode D34 is a Schottky diode, which has a smaller forward voltage drop than a common silicon diode. This results in less energy loss through the first discharge diode D34 during the discharge of the first supercapacitor EC5, providing a more stable voltage to the boost module. Furthermore, the short reverse recovery time of the Schottky diode allows for a rapid switch from "off" to "on" when a voltage drop occurs, enabling the first supercapacitor EC5 to quickly discharge to the boost module. This prevents momentary power loss due to power interruption, ensuring the continuity and stability of the boost module's operation. Simultaneously, compared to traditional power supply circuits, this application's power circuit also improves its response rate to voltage drops.

[0027] In other embodiments, reference is made to Figure 1The backup power supply circuit also includes a second supercapacitor EC6. The first terminal of the second supercapacitor EC6 is connected to the second terminal of the first supercapacitor EC5. The second terminal of the second supercapacitor EC6 is connected to the first ground wire GND1. By setting the second supercapacitor EC6 and the first supercapacitor EC5 in series, the capacity of the supercapacitor is increased so as to extend the time for the supercapacitor to replace the power module to supply power to the boost module, in order to cope with the situation where the voltage recovery is slow after a drop.

[0028] It should be noted that more supercapacitors can be connected in series as needed to extend the duration of supercapacitor power supply. The first ground wire, GND1, is the ground wire of the power supply circuit in this application.

[0029] It is understandable that the backup power supply circuit also includes a second discharge diode D35. The input terminal of the second discharge diode D35 is connected to the second terminal of the charging resistor R83 and the first terminal of the first supercapacitor EC5, respectively. The output terminal of the second discharge diode D35 is connected to the power module and the boost module, respectively.

[0030] For example, in some embodiments, reference is made to Figure 1 In this embodiment, the second discharge diode D35 is connected in parallel with the first discharge diode D34. The second discharge diode D35 plays a stabilizing role, that is, when the first discharge diode D34 is damaged, the supercapacitor can still discharge through the second discharge diode D35.

[0031] In other embodiments, if the capacitance and leakage current of the first supercapacitor EC5 and the second supercapacitor EC6 are slightly different, if only the first discharge diode D34 is provided, it is easy for one of the supercapacitors to discharge to 0V first, while the other supercapacitor is not fully discharged. Its voltage will be directly applied to the two ends of the fully discharged supercapacitor, resulting in reverse overvoltage and damaging the fully discharged supercapacitor. However, by providing the second discharge diode D35, it is convenient to force equalize the discharge current through the combined use of the first discharge diode D34 and the second discharge diode D35, thereby protecting the supercapacitors connected in series.

[0032] It should be noted that the number of discharge diodes can be increased or decreased according to actual needs, but at least one must be included.

[0033] It is understood that the power module includes a protection circuit and a power conversion circuit. The protection circuit is connected to the power conversion circuit, which is also connected to the boost module and the backup power supply circuit. The protection circuit is used to output the input voltage to the power conversion circuit, which is used to convert the input voltage into the required output voltage. The power conversion circuit is also used to output the output voltage to the boost module and the backup power supply circuit.

[0034] For example, in some embodiments, the power conversion circuit is configured to facilitate the conversion of the input voltage of the external power supply into the required voltage value, while the protection circuit is configured to facilitate the resolution of electromagnetic compatibility (EMC) issues to meet the EMC level 4 standard, enabling the power supply circuit of this application to still work normally in harsh electromagnetic environments, while also playing a certain role in suppressing the electromagnetic interference generated by the power supply circuit of this application.

[0035] It can be understood that the protection circuit includes a resettable fuse F1, a first varistor VAR1, a first inductor L1, a first safety capacitor CX2, a second safety capacitor CY1, a third safety capacitor CY2, a fourth safety capacitor CY3, and a common-mode filter L2. The first terminal of the resettable fuse F1 is connected to the positive terminal of the external input power supply. The second terminal of the resettable fuse F1 is connected to the first terminal of the first inductor L1 and the first terminal of the first varistor VAR1. The second terminal of the first varistor VAR1 is connected to the negative terminal of the external input power supply. The second terminal of the first inductor L1 is connected to the first terminal of the first safety capacitor CX2 and the first input terminal (pin 1) of the common-mode filter L2. The second terminal of the first safety capacitor CX2 is connected to the negative terminal of the external input power supply and the second input terminal (pin 2) of the common-mode filter L2. The first output terminal (pin 3) of the common-mode filter L2 is used to connect to the second ground GND_EARTH2 through the third safety capacitor CY2. The second output terminal (pin 4) of the common-mode filter L2 is used to connect to the second ground GND_EARTH2 through the second safety capacitor CY1. The first terminal of the fourth safety capacitor CY3 is connected to the first ground GND1. The second terminal of the fourth safety capacitor CY3 is used to connect to the second ground GND_EARTH2. The power conversion circuit is also connected to the first output terminal and the second output terminal of the common-mode filter L2.

[0036] For example, in some embodiments, reference is made to Figure 3 In this embodiment, when an external power source inputs AC power, such as 220VAC, the first varistor VAR1 absorbs the surge voltage generated by the external power source, clamping the voltage within a safe range to prevent high voltage from damaging the power module and improving the power module's surge immunity. The first inductor L1 and the first safety capacitor CX2 are combined to form an LC differential-mode filter circuit to suppress differential-mode interference. The common-mode filter L2, the second safety capacitor CY1, the third safety capacitor CY2, and the fourth safety capacitor CY3 are combined to form a common-mode filter circuit to suppress common-mode interference. The resettable fuse F1 is designed so that when the current is too high, the resistance of the resettable fuse F1 will suddenly increase to a high resistance state, thereby forming an open circuit to achieve overcurrent protection, thus improving the power module's immunity. The self-resetting characteristic also reduces the replacement frequency of the resettable fuse F1, further reducing maintenance costs.

[0037] In other embodiments, reference is made to Figure 2 When an external power supply provides DC power, such as 48VDC, the protection circuit also includes a second varistor VAR2, a gas discharge tube G1, a second electrolytic capacitor EC1, and a diode D1. The first terminal of the second varistor VAR2 is connected to the second terminal of the first varistor VAR1, and the second terminal of the second varistor VAR2 is connected to the second terminal of the gas discharge tube G1. The first terminal of the gas discharge tube G1 is connected to the second ground wire GND_EARTH2 and the second terminal of the fourth safety capacitor CY3. The gas discharge tube G1 and the second varistor VAR2 are configured to suppress the connection between the negative terminal of the external power supply and the second ground wire GND_EARTH2 when an external power supply provides DC power. The common-mode surge between H2 is also enhanced, which strengthens the surge discharge capability of the protection circuit to ground. The positive terminal of diode D1 is connected to the second output terminal of common-mode filter L2, and the negative terminal of diode is connected to the first terminal of second electrolytic capacitor EC1 and power conversion circuit. Since diode is unidirectional, the diode is designed to prevent reverse polarity of DC input from external power supply, thereby avoiding reverse DC flow and damage to components. The second terminal of second electrolytic capacitor EC1 is connected to the first output terminal of common-mode filter L2 and power conversion module respectively. The design of second electrolytic capacitor EC1 is adapted to the low-frequency ripple characteristics of DC power supply, thereby improving the stability of voltage input to power conversion module.

[0038] It should be noted that the second ground wire GND_EARTH2 is a ground wire that is directly physically connected to the earth.

[0039] It is understood that the power conversion circuit includes a power conversion module, a transient voltage suppressor (TVS1), a first electrolytic capacitor (EC2), a first filter capacitor (C88), and a second filter capacitor (C89). The input terminal of the power conversion module is connected to the protection circuit. The first output terminal of the power conversion module is connected to the first terminal of the transient voltage suppressor (TVS1), the first terminal of the first electrolytic capacitor (EC2), the first terminal of the first filter capacitor (C88), the first terminal of the second filter capacitor (C89), and the first terminal of the resettable fuse (F1). The second terminals of the transient voltage suppressor (TVS1), the first electrolytic capacitor (EC2), the first filter capacitor (C88), and the second filter capacitor (C89) are all connected to the first ground wire (GND1).

[0040] For example, in some embodiments, reference is made to Figure 2In this embodiment, the external power input to the power module is DC power. The power conversion module is a DC-to-DC power supply U1, model URB4805LD. Pins 1 and 2 of the DC-to-DC power supply U1 are connected to the two ends of the second electrolytic capacitor EC1, while pins 3 and 5 are connected to the two ends of the transient voltage suppressor (TVS1), so as to convert the input DC power into the required DC power and output it through the +5V terminal. The TVS1 is configured to... The large current generated by transient high voltage is quickly discharged to the first ground line GND1, while the output voltage is clamped within a safe range, thereby preventing components from being damaged by transient high voltage. The first terminal of the first electrolytic capacitor EC2 is connected to the +5V output terminal, and the second terminal of the first electrolytic capacitor EC2 is connected to the first ground line GND1, so that the low-frequency ripple in the output voltage can be filtered out by the first electrolytic capacitor EC2. The setting of the first filter capacitor C88 and the second filter capacitor C89 facilitates the filtering out of the high-frequency ripple in the output voltage, thereby ensuring the stability of the power module output voltage.

[0041] In other embodiments, reference is made to Figure 3 In this embodiment, the external power input to the power module is AC power. At this time, the power conversion module is an AC-to-DC power module U2, model LH10. Pin 3 of the AC-to-DC power module U2 is connected to the second output terminal of the common-mode filter L2. Pin 2 of the AC-to-DC power module U2 is connected to the first output terminal of the common-mode filter L2 and the first terminal of the third safety capacitor CY2, respectively. Pin 1 of the AC-to-DC power module U2 is connected to the second terminal of the third safety capacitor CY2 and the second terminal of the second safety capacitor CY1, respectively. Pins 6 and 4 of the AC-to-DC power module U2 are connected to the two ends of the transient voltage suppressor TVS1, respectively, so as to convert the input AC power into the required DC power and output it through the +5V terminal.

[0042] It should be noted that the power supply voltage provided to the distribution network terminal power circuit is often fixed. Therefore, in practical applications, the voltage will be... Figure 2 and Figure 3 The circuits are compatible on the same circuit board. Therefore, when the external power input voltage is AC, the second varistor VAR2, gas discharge tube G1, second electrolytic capacitor EC1 and diode D1 are not soldered, and the power conversion module is replaced with AC to DC power module U2. When the external power input voltage is DC, the second varistor VAR2, gas discharge tube G1, second electrolytic capacitor EC1 and diode D1 need to be soldered, and the power conversion module is replaced with DC to DC power module U1 to be compatible with multiple input voltage levels.

[0043] It is understood that the boost module includes a boost chip U13 and a compensation circuit. The compensation circuit includes a first capacitor C64, a second capacitor C65, and a first resistor R79. The first pin SW of the boost chip U13 is connected to the power module. The second pin COMP of the boost chip U13 is connected to the first terminal of the first capacitor C64 and the first terminal of the second capacitor C65, respectively. The second terminal of the first capacitor C64 is connected to the first terminal of the first resistor R79. The second terminals of the first resistor R79 and the second terminals of the second capacitor C65 are both connected to the first ground line GND1. The third pin VOUT of the boost chip U13 is used to output the boosted voltage to the system power supply of the distribution network terminal.

[0044] For example, in some embodiments, reference is made to Figure 1 In this embodiment, the boost chip U13 is model SGM6612A. The first pin SW of the boost chip U13 is connected to the power module, the first terminal of the first charging resistor R83, the output terminal of the first discharge diode D34, and the output terminal of the second discharge diode D35. The compensation circuit is connected to the second pin COMP of the boost chip U13 (i.e., the compensation circuit is connected to the input terminal of the internal error amplifier of the boost chip U13). By setting the compensation circuit, the stability of the output voltage of the boost chip U13 is maintained when a voltage drop occurs. The boost module also includes a third resistor R81 and a fourth resistor R82. The first terminal of the third resistor R81 is connected to the fifth pin FTEQ of the boost chip U13, and the second terminal of the third resistor R81 is connected to the first ground line GND1 to adjust the switching frequency of the boost chip U13. The first terminal of the fourth resistor R82 is connected to the sixth pin ILIM of the boost chip U13, and the second terminal of the fourth resistor R82 is connected to the first ground line GND1 to limit the peak switching current of the boost chip U13.

[0045] It is understood that the power supply circuit of this application also includes a delay circuit. The boost module is connected to the system power supply of the distribution network terminal through the delay circuit. The delay circuit is used to delay the time for the output voltage of the boost module to be output to the system power supply of the distribution network terminal.

[0046] For example, in some embodiments, reference is made to Figure 1In this embodiment, the boost module outputs the boosted voltage to the distribution network terminal's system power supply via a delay circuit. The delay circuit ensures a more stable boosted voltage. Upon power-up, the 5V output from the power module charges both the first supercapacitor EC5 and the second supercapacitor EC6, while simultaneously powering the boost module. Therefore, the power module's output current is relatively high at this time. Directly using the boosted 5.15V power supply as the distribution network terminal's system power supply could increase the workload on the power module, potentially leading to unstable power supply. Furthermore, the 5.15V ramp-up time would affect the normal operation of the distribution network terminal's power system. The delay circuit allows the 5.15V boosted power supply to stabilize before being output to the distribution network terminal's power system, ensuring overall stable operation.

[0047] It can be understood that the delay circuit includes a voltage detector U16, a transistor Q1, a second resistor R134, a third capacitor C59, a fourth capacitor C60, and a fifth capacitor C70. The input pin VCC of the voltage detector U16 is connected to the power supply module. The output pin VOUT of the voltage detector U16 is connected to the fourth pin EN of the boost chip U13 and the first terminal of the second resistor R134. The second terminal of the second resistor R134 is connected to the gate of the transistor Q1 and the first terminal of the fifth capacitor C70. The second terminal of the fifth capacitor C70 is connected to the gate of the transistor Q1 and the first terminal of the fifth capacitor C70. The source of transistor Q1 is connected to the first ground line GND1. The drain of transistor Q1 is connected to the first terminal of the third capacitor C59, the first terminal of the fourth capacitor C60, and the third ground line 5GND. The second terminal of the third capacitor C59 is connected to the third pin VOUT of the boost chip U13 and the system power supply of the distribution terminal. The second terminal of the fourth capacitor C60 is connected to the third pin VOUT of the boost chip U13 and the system power supply of the distribution terminal. In other words, the output voltage of the power supply circuit of this application is output to the system power supply of the distribution terminal through the +5V1 output terminal.

[0048] For example, in some embodiments, reference is made to Figure 1Transistor Q1 is an NMOS transistor. The first terminal of the second resistor R134 is connected to the power module (+5V output terminal), and the second terminal of the second resistor R134 is connected to the input pin VCC of the voltage detector U16. The first terminal of the fifth capacitor C70 is connected between the second terminal of the second resistor R134 and the input pin VCC of the voltage detector U16. When the power module supplies power to the delay circuit through the +5V input terminal, it also charges the fifth capacitor C70 through the second resistor R134. The delay circuit also includes a pull-up resistor R133, a fifth resistor R131, and a sixth capacitor C71. The first terminal of the pull-up resistor R133 is connected to the fourth pin EN of the boost chip U13, and the pull-up resistor R134... The second terminal of capacitor 33 is connected to the third pin VOUT of boost chip U13. The input pin VCC of voltage detector U16 is connected to the power module through the fifth resistor R131. The first terminal of the sixth capacitor C71 is connected between the fifth resistor R131 and the input pin VCC of voltage detector U16. The detection threshold voltage of voltage detector U16 is 3.9V. Voltage detector U16 is an N-channel open-drain output, and its default state is normally open and active low. The fourth pin EN of boost chip U13 is connected to the output pin VOUT of voltage detector U16. When powered on, the power module charges the sixth capacitor C71 through the fifth resistor R131. Before the voltage of the fifth capacitor C71 reaches 3.9V, the boost chip... The fourth pin EN of U13 will remain low. When the voltage of the sixth capacitor C71 reaches 3.9V, the output pin VOUT of the voltage detector U16 is in a high-impedance state. At this time, the pull-up resistor R133 causes the voltage of the fourth pin EN of the boost chip U13 to go high. Therefore, the fourth pin EN of the boost chip U13 charges the fifth capacitor C70 through the second resistor R134. When the voltage of the fifth capacitor C70 reaches the threshold voltage of the gate of transistor Q1, the third ground 5GND and the first ground GND1 are electrically connected, thus realizing the power-on process (i.e., the input of external power). By adjusting the resistance value of the fifth resistor R131 and the capacitance of the sixth capacitor C71, the power-on process of the boost chip can be adjusted. The interval between the start of voltage boosting by U13 is designed to prevent overcurrent issues caused by the power module simultaneously charging the first supercapacitor EC5 and the second supercapacitor EC6 and powering the boost chip U13 for voltage boosting at the moment of power connection. Furthermore, the fourth pin EN of the boost chip U13 only begins charging the fifth capacitor C70 after it goes high. Therefore, the turn-on time of transistor Q1 is later than that of the boost chip U13. The turn-on time of transistor Q1 can be adjusted by changing the resistance of the second resistor R134 and the capacitance of the fifth capacitor C70, thereby regulating the delay time for outputting the boosted voltage to the power distribution terminal system. This prevents unstable output voltage at the beginning of boost module operation.Furthermore, after the boost module stabilizes, transistor Q1 is used to conduct the first ground line GND1 and the second ground line GND_EARTH2. The short conduction time of transistor Q1 avoids the problem of slow output voltage from the power supply circuit. Through dual control of the fourth pin EN of the boost chip U13 and transistor Q1, the voltage output to the distribution network terminal system power supply via the +5V1 output terminal can be made more stable. The delay circuit also includes a third discharge diode D32. The input terminal of the third discharge diode D32 is connected to the second terminal of the second resistor R134, and the output terminal of the third discharge diode D32 is connected to the fourth pin EN of the boost chip U13. When power is off (i.e., external power input stops), the first supercapacitor EC5 and the second supercapacitor EC6 discharge through the first discharge diode D34 and the second discharge diode D35, allowing the boost chip U13 to continue boosting the voltage, providing time for the distribution network terminal to save data. At this time, the power module has no output, and the output voltage of the first supercapacitor EC5 and the second supercapacitor EC6 is 5V. As the output voltage of the first supercapacitor EC5 and the second supercapacitor EC6 decreases... As the voltage decreases, the voltage at the input pin VCC of voltage detector U16 also decreases. When the voltage at the input pin VCC of voltage detector U16 drops below 3.9V, the output pin VOUT and the ground pin VSS of voltage detector U16 are connected, meaning the output pin VOUT of voltage detector U16 is connected to the first ground line GND1. At this time, the fourth pin EN of boost chip U13 turns low, causing boost chip U13 to stop working. Meanwhile, the fifth capacitor C70 discharges current through the third discharge diode D32, rapidly discharging current through voltage detector U16 to the first ground line GND1, thus causing transistor Q1 to switch from on to off, achieving the power-off process of the distribution network terminal. By controlling the level of the fourth pin of boost chip U13 and the on / off state of transistor Q1 through voltage detector U16, the power-off of the distribution network terminal can be made more rapid, preventing the capacitor from being unloaded and the voltage from rising back, thus protecting the distribution network terminal.

[0049] It should be noted that the third ground wire 5GND is the reference ground wire of the power distribution terminal system.

[0050] It is understandable that the boost module also includes a third filter capacitor C72, a first ferrite bead B5, and a second ferrite bead B6. The third pin of the boost chip U13 is connected to the first pin of the third filter capacitor C72, the first pin of the first ferrite bead B5, and the first pin of the second ferrite bead B6, respectively. The second pin of the third filter capacitor C72 is connected to the first ground wire GND1. The second pins of the first ferrite bead B5 and the second pins of the second ferrite bead B6 are both used to connect to the system power supply of the distribution network terminal.

[0051] For example, in some embodiments, reference is made to Figure 1In this embodiment, the boost module also includes a fourth filter capacitor C73 and a fifth filter capacitor C74. Both the fourth filter capacitor C73 and the fifth filter capacitor C74 are connected in parallel with the third filter capacitor C72 to enhance the filtering effect and ensure the stability of the voltage output to the power distribution terminal system. The setting of the first magnetic bead B5 and the second magnetic bead B6 facilitates the suppression of high-frequency signals and electromagnetic interference, while the parallel connection of the first magnetic bead B5 and the second magnetic bead B6 facilitates the improvement of the output current capability.

[0052] In other embodiments, reference is made to Figure 1 In this embodiment, the boost module further includes a first voltage divider resistor R78, a second voltage divider resistor R77, and a third voltage divider resistor R80. The first end of the first voltage divider resistor R78 is connected to the third pin VOUT of the boost chip U13. The second end of the first voltage divider resistor R78 is connected to the first end of the second voltage divider resistor R77. The second end of the second voltage divider resistor R77 is connected to the first end of the third voltage divider resistor R80. The second end of the third voltage divider resistor R80 is connected to the first ground line GND1. The seventh pin FB of the boost chip U13 is connected between the second voltage divider resistor R77 and the third voltage divider resistor R80 so as to receive feedback of the output voltage of the power supply circuit through the seventh pin FB of the boost chip U13, thereby performing adaptive adjustment and compensation to ensure the stability of the output voltage. Since the first voltage divider resistor R78 and the second voltage divider resistor R77 are connected in series, the voltage output by the power supply circuit to the power distribution terminal power system of this application can be more accurately adjusted to the required value by finely adjusting the resistance value of the first voltage divider resistor R78.

[0053] The distribution network terminal equipment according to the second aspect embodiment of the application includes the power supply circuit of the first aspect embodiment of the application described above.

[0054] According to the device of this application embodiment, this application provides the required voltage to the power circuit by setting a power module, and boosts the voltage input to the power module by setting a boost module to ensure the stability of the output voltage. This ensures that even if voltage loss occurs during transmission, the voltage finally output to the distribution network terminal equipment remains within a reasonable range. By setting a backup power supply circuit, it can replace the power module to continue supplying power when the power module stops supplying power. That is, when the power module is in the power supply state, while supplying power to the boost module, it also charges the first supercapacitor EC5 through the charging resistor R83. When a voltage drop occurs, causing the power module to stop supplying power to the boost module, the first supercapacitor EC5 stops charging from the charging resistor R83. The circuit switches from an electrical state to a discharge state, continuously discharging to the boost module, allowing the boost module to continue boosting the voltage and outputting the boosted voltage to the distribution network terminal's system power supply. This avoids power outages caused by voltage drops, improving the reliability and stability of the distribution network terminal and reducing its maintenance costs. The inclusion of a first discharge diode prevents reverse current flow back to the first supercapacitor EC5, thus preventing damage and further reducing maintenance costs. By introducing the power supply circuit of this application, the distribution network terminal equipment can effectively avoid voltage drops, reducing equipment damage and maintenance costs.

[0055] Since the device includes the power supply circuit of the first aspect embodiment, the corresponding contents of the power supply circuit in the first aspect embodiment can be applied to the distribution network terminal device of the second aspect, and have the same implementation principle and technical effect. To avoid redundancy, it will not be described in detail here.

[0056] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A power supply circuit, characterized in that, include: Power module; Boost module; The boost module is connected to the power module. The boost module is used to boost the voltage input to the power module and also to output the boosted voltage to the system power supply of the distribution network terminal. A backup power supply circuit includes a first supercapacitor, a charging resistor, and a first discharging diode. The first end of the charging resistor is connected to the power module and the boost module, respectively. The second end of the charging resistor is connected to the first end of the first supercapacitor and the input end of the first discharging diode, respectively. The second end of the first supercapacitor is used to connect to a first ground wire. The output end of the first discharging diode is connected to the power module and the boost module, respectively. The backup power supply circuit is used to supply power to the boost module in place of the power module when the power module stops supplying power to the boost module.

2. The power supply circuit according to claim 1, characterized in that, The backup power supply circuit also includes a second discharge diode. The input terminal of the second discharge diode is connected to the second terminal of the charging resistor and the first terminal of the first supercapacitor, respectively. The output terminal of the second discharge diode is connected to the power module and the boost module, respectively.

3. The power supply circuit according to claim 1, characterized in that, The power module includes a protection circuit and a power conversion circuit. The protection circuit is connected to the power conversion circuit, and the power conversion circuit is also connected to the boost module and the backup power supply circuit. The protection circuit is used to output the input voltage to the power conversion circuit. The power conversion circuit is used to convert the input voltage into the required output voltage. The power conversion circuit is also used to output the output voltage to the boost module and the backup power supply circuit.

4. The power supply circuit according to claim 3, characterized in that, The protection circuit includes a resettable fuse, a first varistor, a first inductor, a first safety capacitor, a second safety capacitor, a third safety capacitor, a fourth safety capacitor, and a common-mode filter. The first end of the resettable fuse is connected to the positive terminal of the input power supply. The second end of the resettable fuse is connected to the first end of the first inductor and the first end of the first varistor. The second end of the first varistor is connected to the negative terminal of the input power supply. The second end of the first inductor is connected to the first end of the first safety capacitor and the first input terminal of the common-mode filter. The second end of the first safety capacitor is connected to the negative terminal of the input power supply and the second input terminal of the common-mode filter. The first output terminal of the common-mode filter is connected to a second ground line through the third safety capacitor. The second output terminal of the common-mode filter is connected to a second ground line through the second safety capacitor. The first end of the fourth safety capacitor is connected to the first ground line, and the second end of the fourth safety capacitor is connected to the second ground line. The power conversion circuit is also connected to the first and second output terminals of the common-mode filter.

5. The power supply circuit according to claim 4, characterized in that, The power conversion circuit includes a power conversion module, a transient voltage suppressor, a first electrolytic capacitor, a first filter capacitor, and a second filter capacitor. The input terminal of the power conversion module is connected to the protection circuit. The first output terminal of the power conversion module is connected to the first terminal of the transient voltage suppressor, the first terminal of the first electrolytic capacitor, the first terminal of the first filter capacitor, the first terminal of the second filter capacitor, and the first terminal of the resettable fuse. The second terminals of the transient voltage suppressor, the first electrolytic capacitor, the first filter capacitor, and the second filter capacitor are all connected to the first ground wire.

6. The power supply circuit according to claim 1, characterized in that, The boost module includes a boost chip and a compensation circuit. The compensation circuit includes a first capacitor, a second capacitor, and a first resistor. The first pin of the boost chip is connected to the power module. The second pin of the boost chip is connected to the first terminal of the first capacitor and the first terminal of the second capacitor, respectively. The second terminal of the first capacitor is connected to the first terminal of the first resistor. The second terminals of the first resistor and the second terminals of the second capacitor are both connected to the first ground wire. The third pin of the boost chip is used to output the boosted voltage to the system power supply of the distribution network terminal.

7. The power supply circuit according to claim 6, characterized in that, It also includes a delay circuit, through which the boost module is connected to the system power supply of the distribution network terminal. The delay circuit is used to delay the time when the output voltage of the boost module is output to the system power supply of the distribution network terminal.

8. The power supply circuit according to claim 7, characterized in that, The delay circuit includes a voltage detector, a transistor, a second resistor, a third capacitor, a fourth capacitor, and a fifth capacitor. The input pin of the voltage detector is connected to the power supply module. The output pin of the voltage detector is connected to the fourth pin of the boost chip and the first end of the second resistor. The second end of the second resistor is connected to the gate of the transistor and the first end of the fifth capacitor. The second end of the fifth capacitor is connected to the source of the transistor and the first ground line. The drain of the transistor is connected to the first end of the third capacitor, the first end of the fourth capacitor, and the third ground line. The second end of the third capacitor is connected to the third pin of the boost chip and the system power supply of the distribution network terminal. The second end of the fourth capacitor is connected to the third pin of the boost chip and the system power supply of the distribution network terminal.

9. The power supply circuit according to claim 6, characterized in that, The boost module also includes a third filter capacitor, a first ferrite bead, and a second ferrite bead. The third pin of the boost chip is connected to the first end of the third filter capacitor, the first end of the first ferrite bead, and the first end of the second ferrite bead, respectively. The second end of the third filter capacitor is connected to the first ground wire. The second ends of the first ferrite bead and the second ends of the second ferrite bead are both used to connect to the system power supply of the distribution network terminal.

10. A distribution network terminal device, characterized in that, include: The power supply circuit according to any one of claims 1 to 9.

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