Communication power operation protection system
By using a power-on buffer circuit and a current acquisition and protection circuit, the voltage fluctuation problem of the communication power supply DC-DC module at the moment of power-on is solved, realizing stable power supply and fault protection, improving the reliability of the communication power supply and the health status of the backup battery, and ensuring the stable operation of communication equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI BEICHEN ELECTRIC TECH CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-19
AI Technical Summary
The DC-DC module of the communication power supply is easily affected by the input voltage fluctuation at the moment of power-on, which can cause the control parameters of the soft start circuit to fail, the output voltage to rise too quickly, trigger the overvoltage protection, and thus lead to start-up failure, reducing the reliability of the communication power supply.
A power-on buffer circuit is adopted, including resistor R1, capacitor C1, switching transistor Q1, switching transistor Q2 and DC-DC module. It utilizes the gradual conduction characteristic of the switching transistor to achieve stable power supply, and avoids false turn-on through voltage follower and diode. Combined with current acquisition circuit, comparator and switching transistor Q3 to protect DC-DC module and disconnect power supply in time, timer controls the charging and discharging of backup battery, and display module monitors voltage and current in real time.
It improves the reliability of communication power supply, avoids DC-DC module startup failure due to input voltage fluctuations, protects DC-DC module from load short circuit damage, extends the life of backup battery, and provides real-time monitoring function.
Smart Images
Figure CN224385360U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of power supply technology, and in particular to a communication power supply operation protection system. Background Technology
[0002] With the development of smart grids, power systems rely on communication networks for dispatching, monitoring, and data transmission. Communication power supplies provide uninterrupted power to communication equipment (such as fiber optic communication equipment, microwave equipment, and carrier wave equipment), ensuring the stability and reliability of the communication network. Therefore, the reliability of the communication power supply is directly related to the safety of the power system. If the communication power supply fails, it may lead to communication interruptions, monitoring malfunctions, and the inability of protection devices to operate, ultimately causing power system accidents.
[0003] The core module of a communication power supply is a DC-DC module. When the communication power supply is powered on, the DC-DC module will experience a large inrush current. To avoid the inrush current at the moment of power-on, a soft-start circuit can be added. However, the current soft-start circuit has poor adaptability to input voltage fluctuations. For example, a sudden rise in input voltage may cause the control parameters of the soft-start circuit to fail, the output voltage to rise too quickly, triggering overvoltage protection, thus causing startup failure and reducing the reliability of the communication power supply. Utility Model Content
[0004] This disclosure provides a communication power supply operation protection system to improve the reliability of existing communication power supplies.
[0005] This disclosure provides a communication power supply operation protection system, including a power-on buffer circuit. The power-on buffer circuit includes a resistor R1, a capacitor C1, a switching transistor Q1, a switching transistor Q2, and a DC-DC module.
[0006] The first end of resistor R1 is connected to the power supply, the second end of resistor R1 is grounded through capacitor C1, and the second end of resistor R1 is connected to the control terminal of the switching transistor Q1.
[0007] The first terminal of the switch Q1 is grounded, the second terminal of the switch Q1 is connected to the control terminal of the switch Q2, the first terminal of the switch Q2 is connected to the power supply, and the second terminal of the switch Q2 is connected to the power supply terminal of the DC-DC module.
[0008] In one exemplary embodiment of this disclosure, a voltage follower is provided between the second terminal of the resistor R1 and the control terminal of the switch Q1.
[0009] In one exemplary embodiment of this disclosure, a diode D1 is disposed between the output terminal of the voltage follower and the control terminal of the switching transistor Q1.
[0010] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes a current acquisition circuit, a comparator U2, and a switching transistor Q3.
[0011] The current acquisition circuit is used to acquire the output current of the DC-DC module. The output terminal of the current acquisition circuit is connected to the first input terminal of the comparator U2, the second input terminal of the comparator U2 is connected to the first reference voltage, and the output terminal of the comparator U2 is connected to the control terminal of the switching transistor Q3.
[0012] The first end of the switch Q3 is connected to the second end of the switch Q1, and the second end of the switch Q3 is connected to the control terminal of the switch Q2.
[0013] In one exemplary embodiment of this disclosure, the current acquisition circuit includes a resistor RC and a subtraction circuit.
[0014] The resistor RC is connected in series at the output terminal of the DC-DC module, and the two ends of the resistor RC are respectively connected to the two input terminals of the subtraction circuit. The output terminal of the subtraction circuit is the output terminal of the current acquisition circuit.
[0015] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes:
[0016] A timer is used to trigger the closing of the first or second switch at regular intervals, so as to start the backup battery charging circuit or the backup battery discharging circuit at regular intervals.
[0017] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes:
[0018] The display module is used to display the operating voltage, operating current, and backup battery power of the DC-DC module in real time.
[0019] The communication power supply protection system provided in this embodiment has the following working principle and beneficial effects:
[0020] In this embodiment of the present disclosure, at the moment of power-on, the power supply charges capacitor C1, and the terminal voltage of capacitor C1 gradually increases. As the terminal voltage of capacitor C1 gradually increases, switch Q1 gradually turns on, thereby controlling switch Q2 to gradually turn on. The conduction current of switch Q2 gradually increases, the conduction voltage of switch Q2 gradually decreases, and the power supply terminal voltage of the DC-DC module gradually increases. Finally, the conduction voltage of switch Q2 approaches zero, and the input terminal voltage of the DC-DC module approaches the power supply.
[0021] Therefore, the embodiments of this disclosure utilize the characteristic of the gradually turning on of the switching transistor to achieve stable power supply to the DC-DC module, avoiding the failure of the DC-DC module to start up due to input voltage fluctuations, thereby improving the reliability of the entire communication power supply. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a circuit schematic diagram of a communication power supply operation protection system provided in an embodiment of the present disclosure;
[0024] Figure 2 This is a circuit diagram of a communication power supply operation protection system provided in another embodiment of this disclosure. Detailed Implementation
[0025] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.
[0026] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.
[0027] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:
[0028] Figure 1 A circuit diagram of a communication power supply operation protection system provided in an embodiment of this disclosure. (Refer to...) Figure 1 The communication power supply operation protection system includes a power-on buffer circuit, which comprises a resistor R1, a capacitor C1, a switching transistor Q1, a switching transistor Q2, and a DC-DC module.
[0029] The first terminal of resistor R1 is connected to the power supply, the second terminal of resistor R1 is grounded through capacitor C1, and the second terminal of resistor R1 is connected to the control terminal of switching transistor Q1.
[0030] The first terminal of switch Q1 is grounded, the second terminal of switch Q1 is connected to the control terminal of switch Q2, the first terminal of switch Q2 is connected to the power supply, and the second terminal of switch Q2 is connected to the power supply terminal of the DC-DC module.
[0031] In this embodiment, at the moment of power-on, the power supply charges capacitor C1, and the terminal voltage of capacitor C1 gradually increases. As the terminal voltage of capacitor C1 gradually increases, switch Q1 gradually turns on, which in turn controls switch Q2 to gradually turn on. The conduction current of switch Q2 gradually increases, the conduction voltage of switch Q2 gradually decreases, and the power supply terminal voltage of the DC-DC module gradually increases. Finally, the conduction voltage of switch Q2 approaches zero, and the input terminal voltage of the DC-DC module approaches the power supply voltage.
[0032] Therefore, the embodiments of this disclosure utilize the characteristic of the gradually turning on of the switching transistor to achieve stable power supply to the DC-DC module, avoiding the failure of the DC-DC module to start up due to input voltage fluctuations, thereby improving the reliability of the entire communication power supply.
[0033] Reference Figure 1 In one exemplary embodiment of this disclosure, a voltage follower is provided between the second terminal of resistor R1 and the control terminal of switch Q1.
[0034] In this embodiment, a voltage follower U1A is provided between the second terminal of resistor R1 and the control terminal of switch Q1. The input stage of voltage follower U1A typically uses components such as field-effect transistors (FETs) or operational amplifiers with high input impedance to obtain high input impedance; the output stage adopts a circuit structure that can provide a large output current, such as an emitter follower or source follower, which can provide sufficient current at the output terminal to drive the load, thereby realizing reliable driving of switch Q1.
[0035] Reference Figure 1 In one exemplary embodiment of this disclosure, a diode D1 is disposed between the output terminal of the voltage follower and the control terminal of the switching transistor Q1.
[0036] In this embodiment, a diode D1 is placed between the output terminal of the voltage follower and the control terminal of the switching transistor Q1. The forward voltage drop of the diode D1 can be used to prevent small interference signals from causing the switching transistor Q1 to turn on erroneously, thereby preventing the communication power supply from starting erroneously.
[0037] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes a current acquisition circuit, a comparator U2, and a switching transistor Q3.
[0038] The current acquisition circuit is used to acquire the output current of the DC-DC module. The output of the current acquisition circuit is connected to the first input of comparator U2, the second input of comparator U2 is connected to the first reference voltage, and the output of comparator U2 is connected to the control terminal of the switching transistor Q3.
[0039] The first terminal of switch Q3 is connected to the second terminal of switch Q1, and the second terminal of switch Q3 is connected to the control terminal of switch Q2.
[0040] In this embodiment, when the DC-DC module is working normally, the output current of the DC-DC module is less than the set current threshold, the output voltage of the current acquisition circuit is less than the first reference voltage, the comparator U2 outputs a low-level signal, the switch Q3 is turned on, and the second terminal of the switch Q1 is normally connected to the control terminal of the switch Q2. When the load of the DC-DC module is short-circuited, the output current of the DC-DC module is greater than the set current threshold, the output voltage of the current acquisition circuit is greater than the first reference voltage, the comparator U2 outputs a high-level signal, the switch Q3 is turned off, the connection between the second terminal of the switch Q1 and the control terminal of the switch Q2 is disconnected, the switch Q2 is turned off, and the connection between the power supply and the power supply terminal of the DC-DC module is disconnected in time to avoid damage to the internal components of the DC-DC module due to excessive fault time.
[0041] The first reference voltage is drawn from the backup battery. The output voltage VBAT of the backup battery is divided by a series voltage divider circuit consisting of resistors R6 and R7, and the voltage divided by resistor R7 is used as the first reference voltage. The magnitude of the first reference voltage can be adjusted by changing the resistance values of resistors R6 and R7 as needed.
[0042] As can be seen from the above, the current acquisition circuit, comparator U2 and switching transistor Q3 in this embodiment can disconnect the power supply in time when the load of the DC-DC module is short-circuited, thus effectively protecting the DC-DC module.
[0043] Reference Figure 2 In one exemplary embodiment of this disclosure, the current acquisition circuit includes a resistor RC and a subtraction circuit.
[0044] A resistor RC is connected in series at the output of the DC-DC module. The two ends of the resistor RC are connected to the two inputs of the subtraction circuit, and the output of the subtraction circuit is the output of the current acquisition circuit.
[0045] In this embodiment, the resistor RC and the load RL are connected in series. The current through the resistor RC, which is the output current of the DC-DC module, can be obtained by detecting the voltage across the resistor RC.
[0046] The subtraction circuit consists of resistors R4 and R11 and operational amplifier U5. The two ends of resistor RC are connected to the non-inverting and inverting inputs of operational amplifier U5, respectively. The output of operational amplifier U5 is the voltage difference across resistor RC, i.e., the voltage across resistor RC. Resistor R10 is a matching resistor.
[0047] As can be seen from the above, this embodiment realizes the current acquisition function based on the RC resistor and the subtraction circuit. The circuit structure is simple and easy to implement.
[0048] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes:
[0049] A timer is used to trigger the closing of the first or second switch at regular intervals, so as to start the backup battery charging circuit or the backup battery discharging circuit at regular intervals.
[0050] In this embodiment, by triggering the first switch to close at a set time interval, the backup battery charging process is started at a set time interval, which can prevent the battery from being depleted due to long-term lack of charging, thus affecting its normal use in the event of a main power failure.
[0051] The second switch is triggered at regular intervals to close, causing the backup battery to discharge periodically. This prevents the battery from being fully charged or idle for extended periods, avoids sulfation of the battery plates, and extends the battery's lifespan.
[0052] As can be seen from the above, this embodiment can maintain the health of the backup battery by triggering the charging and discharging process at regular intervals, ensuring that the backup battery can be put into use in time when the main power supply of the communication power supply fails, providing stable power support for the communication equipment and reducing the risk of communication interruption caused by battery problems.
[0053] In one exemplary embodiment of this disclosure, the communication power supply operation protection system further includes:
[0054] The display module is used to display the operating voltage, operating current, and backup battery power of the DC-DC module in real time.
[0055] In this embodiment, the display module allows staff to directly obtain key parameters of the DC-DC module and backup battery, enabling them to promptly detect abnormalities such as abnormal voltage fluctuations in the DC-DC module, excessive current, or low battery power in the backup battery, so that timely repairs can be carried out.
[0056] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A communication power supply operation protection system, characterized in that, It includes a power-on buffer circuit, which comprises a resistor R1, a capacitor C1, a switching transistor Q1, a switching transistor Q2, and a DC-DC module. The first end of resistor R1 is connected to the power supply, the second end of resistor R1 is grounded through capacitor C1, and the second end of resistor R1 is connected to the control terminal of the switching transistor Q1. The first terminal of the switch Q1 is grounded, the second terminal of the switch Q1 is connected to the control terminal of the switch Q2, the first terminal of the switch Q2 is connected to the power supply, and the second terminal of the switch Q2 is connected to the power supply terminal of the DC-DC module.
2. The communication power supply operation protection system as described in claim 1, characterized in that, A voltage follower is provided between the second end of the resistor R1 and the control terminal of the switch Q1.
3. The communication power supply operation protection system as described in claim 2, characterized in that, A diode D1 is provided between the output terminal of the voltage follower and the control terminal of the switching transistor Q1.
4. The communication power supply operation protection system as described in claim 1, characterized in that, It also includes a current acquisition circuit, comparator U2, and switching transistor Q3. The current acquisition circuit is used to acquire the output current of the DC-DC module. The output terminal of the current acquisition circuit is connected to the first input terminal of the comparator U2, the second input terminal of the comparator U2 is connected to the first reference voltage, and the output terminal of the comparator U2 is connected to the control terminal of the switching transistor Q3. The first end of the switch Q3 is connected to the second end of the switch Q1, and the second end of the switch Q3 is connected to the control terminal of the switch Q2.
5. The communication power supply operation protection system as described in claim 4, characterized in that, The current acquisition circuit includes an RC resistor and a subtraction circuit. The resistor RC is connected in series at the output terminal of the DC-DC module, and the two ends of the resistor RC are respectively connected to the two input terminals of the subtraction circuit. The output terminal of the subtraction circuit is the output terminal of the current acquisition circuit.
6. The communication power supply operation protection system as described in claim 1, characterized in that, Also includes: A timer is used to trigger the closing of the first or second switch at regular intervals, so as to start the backup battery charging circuit or the backup battery discharging circuit at regular intervals.
7. The communication power supply operation protection system as described in claim 1, characterized in that, Also includes: The display module is used to display the operating voltage, operating current, and backup battery power of the DC-DC module in real time.