Auxiliary power supply circuit of communication power supply

Abstract

The utility model provides an auxiliary power supply circuit of a communication power supply. The auxiliary power supply circuit comprises an AC input circuit, a rectification filter circuit and a voltage stabilization and protection circuit. The AC input circuit is electrically connected with the rectification filter circuit and is used for converting and transmitting electric energy of an AC power supply. The rectification filter circuit is electrically connected with the AC input circuit and the voltage stabilization and protection circuit, and is used for converting an AC voltage into a pulsating DC voltage. The voltage stabilization and protection circuit is electrically connected with the rectification filter circuit and is used for providing stable DC working voltage and carrying out overvoltage protection. Resonance energy is transmitted to the next stage through the alternating current input circuit, alternating current voltage is converted into direct current voltage through the rectifying and filtering circuit, output voltage is stabilized at 12V through the voltage stabilizing and protecting circuit, and an overvoltage protection function is achieved, so that stable and reliable auxiliary power supply output is provided, normal operation of the whole communication system is ensured, and the communication system is safe and reliable. The method has the advantages of high efficiency, stability, reliability and safety.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a communication power supply auxiliary power supply circuit. Background Art

[0002] The communication power supply for base stations has a large power supply, so a micro power supply that provides low-voltage DC working voltage is required. Generally, power supply manufacturers will design an independent micro power supply system. Using an independent auxiliary power supply not only increases the cost, but also causes the entire system to stop working if the auxiliary power supply fails.

[0003] Chinese patent CN220359014U "An outdoor communication power supply device" discloses an outdoor communication power supply device for supplying power to an outdoor base station. However, when the power supply device fails, the power supply will stop, and the communication power supply for the base station generally requires a large power, has a complex structure, a high failure rate, and a high cost. Utility Model Content

[0004] In view of this, the utility model proposes a communication power auxiliary power circuit to solve the problems of complex structure, high failure rate and high cost of the existing communication power supply.

[0005] The technical solution of the utility model is implemented as follows: a communication power auxiliary power circuit, including an AC input circuit, a rectifier filter circuit and a voltage stabilization and protection circuit;

[0006] The AC input circuit is electrically connected to the rectifier and filter circuit, and is used to convert and transmit the electrical energy of the AC power supply;

[0007] The rectifier and filter circuit is electrically connected to the AC input circuit and the voltage stabilization and protection circuit, and is used to convert the AC voltage into a pulsating DC voltage;

[0008] The voltage stabilization and protection circuit is electrically connected to the rectifier and filter circuit, and is used to provide a stable DC working voltage and perform overvoltage protection.

[0009] Preferably, the AC input circuit includes a fuse F1, a capacitor C1 and a transformer T1;

[0010] One end of the fuse F1 is electrically connected to pin 1 of the transformer T1 , and the other end of the fuse F1 is input with the resonant voltage. One end of the capacitor C1 is electrically connected to pin 2 of the transformer T1 , and the other end of the capacitor C1 is input with the resonant voltage.

[0011] Preferably, the rectification and filtering circuit includes a capacitor C2 and a diode D1;

[0012] The cathode of the diode D1 is electrically connected to the anode of the capacitor C2, and the cathode of the capacitor C2 is grounded.

[0013] Preferably, the pin 4 of the transformer T1 is electrically connected to the positive electrode of the diode D1 , and the pin 3 of the transformer T1 is electrically connected to the negative electrode of the capacitor C2 .

[0014] Preferably, the voltage stabilization and protection circuit includes resistors R1, R2, R3, R4, R5, R6, R7, capacitors C3, C4, voltage stabilizing diodes D2, D3, D4, D5, and transistors Q1, Q2, Q3;

[0015] One end of the resistor R1 is electrically connected to the emitter of the transistor Q1 and the cathode of the Zener diode D3, the other end of the resistor R1 is electrically connected to the base of the transistor Q1, one end of the capacitor C4 and one end of the resistor R2, the collector of the transistor Q1 is connected to the other end of the capacitor C4, the cathode of the Zener diode D2, and one end of the resistor R5 is connected to a +12V voltage, the other end of the resistor R4 is electrically connected to one end of the capacitor C3, the other end of the resistor R2 is electrically connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the other end of the capacitor C3, and the resistor R5 The other end of the transistor, the collector of the transistor Q3, the anode of the Zener diode D5 and one end of the resistor R6 are electrically connected, the cathode of the Zener diode D5 is electrically connected to the anode of the Zener diode D4, the cathode of the Zener diode D4 is electrically connected to the anode of the Zener diode D3, the base of the transistor Q3 is electrically connected to the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 and the emitter of the transistor Q3 are grounded, the emitter of the transistor Q2 is electrically connected to one end of the resistor R3 and the anode of the Zener diode D2, and the other end of the resistor R3 is grounded.

[0016] Preferably, the cathode of the diode D1 is electrically connected to the anode of the capacitor C2 and one end of the resistor R1.

[0017] The utility model provides a communication power auxiliary power circuit, which has the following beneficial effects compared with the prior art:

[0018] (1) The resonant energy is transmitted to the next stage through the AC input circuit, and then the AC voltage is converted into DC voltage by the rectifier and filter circuit. The output voltage is stabilized at 12V by the voltage stabilization and protection circuit. It also has an overvoltage protection function, thereby providing a stable and reliable auxiliary power output, ensuring the normal operation of the entire communication system, and has the advantages of high efficiency, stability, reliability and safety;

[0019] (2) Through the resonance principle and high-frequency characteristics, efficient energy transmission is achieved and it has a protective effect, laying the foundation for the efficient operation of the subsequent circuit;

[0020] (3) Using the basic principles of diode rectification and capacitor filtering, the AC voltage is efficiently converted into a pulsating DC voltage, providing power for the normal operation of the subsequent circuit. It has the advantages of simple structure, small size and low cost.

[0021] (4) Through the coordinated work of functional modules such as linear voltage regulation, startup circuit and overvoltage protection, a stable and reliable DC working power supply is provided for the subsequent circuit, ensuring the normal operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a structural diagram of a communication power auxiliary power circuit of the utility model;

[0024] Figure 2 This is a circuit wiring diagram of an AC input circuit of a communication power auxiliary power circuit of the utility model;

[0025] Figure 3 This is a circuit wiring diagram of a rectifier and filter circuit of a communication power auxiliary power circuit of the utility model;

[0026] Figure 4 This is a circuit wiring diagram of a voltage stabilizing and protection circuit of a communication power auxiliary power circuit of the utility model;

[0027] Figure 5 The utility model discloses an overall circuit wiring diagram of a communication power supply auxiliary power supply circuit. DETAILED DESCRIPTION

[0028] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Provide a communication power auxiliary power circuit, such as Figure 1 As shown, it includes an AC input circuit 1, a rectifier and filter circuit 2, and a voltage stabilization and protection circuit 3;

[0030] The AC input circuit 1 is electrically connected to the rectifier and filter circuit 2, and is used to convert and transmit the electric energy of the AC power supply;

[0031] The rectifier and filter circuit 2 is electrically connected to the AC input circuit 1 and the voltage stabilization and protection circuit 3, and is used to convert the AC voltage into a pulsating DC voltage;

[0032] The voltage stabilization and protection circuit 3 is electrically connected to the rectifier and filter circuit 2, and is used to provide a stable DC working voltage and perform overvoltage protection.

[0033] It should be noted that:

[0034] A communication power auxiliary power circuit of the present embodiment is composed of an AC input circuit 1, a rectification and filtering circuit 2, and a voltage stabilization and protection circuit 3.

[0035] The working process is that the resonant voltage is transformed by the transformer, the amplitude is reduced, and then it is rectified and filtered by the rectifier and filter circuit 2 to form a pulsating DC voltage, and the voltage is stabilized at 12V by the voltage stabilization and protection circuit 3.

[0036] like Figure 2 As shown, the AC input circuit 1 includes a fuse F1, a capacitor C1 and a transformer T1;

[0037] One end of the fuse F1 is electrically connected to pin 1 of the transformer T1 , and the other end of the fuse F1 is input with the resonant voltage. One end of the capacitor C1 is electrically connected to pin 2 of the transformer T1 , and the other end of the capacitor C1 is input with the resonant voltage.

[0038] It should be noted that:

[0039] The AC input circuit 1 inputs the resonant voltage, the primary winding of the transformer T1 receives the resonant voltage, and the fuse F1 can prevent the output 12V load from being too large and causing the transformer to burn out.

[0040] The resonant voltage is the input of the AC input circuit 1, C1 is a DC blocking capacitor, and T1 is a common high-frequency transformer.

[0041] The AC input circuit 1 receives the resonant voltage signal as input, and uses the high-frequency characteristics to achieve efficient energy transmission, reduce circuit impedance, and reduce power consumption and heat generation. High-frequency small signals are beneficial to the processing of the subsequent circuits, and help to achieve miniaturization and integrated design. Fuse F1 protects the circuit and prevents inrush current from damaging components.

[0042] The AC input circuit 1 receives a high-frequency resonant voltage signal and utilizes its high-frequency characteristics to achieve efficient energy transmission, thereby laying a foundation for efficient operation of subsequent circuits and having a protective effect.

[0043] like Figure 3 As shown, the rectification and filtering circuit 2 includes a capacitor C2 and a diode D1;

[0044] The cathode of the diode D1 is electrically connected to the anode of the capacitor C2, and the cathode of the capacitor C2 is grounded.

[0045] It should be noted that:

[0046] The principle of the rectifier and filter circuit 2 is to convert the AC voltage into a pulsating DC voltage by utilizing the unidirectional conductive characteristics of the diode and the filtering effect of the capacitor.

[0047] The secondary winding of transformer T1 outputs AC voltage. In the positive half cycle, diode D1 is forward-conducted and capacitor C2 is charged through D1. In the negative half cycle, D1 is reverse-cut off and C2 discharges to the load in this process.

[0048] The charging and discharging process of capacitor C2 forms a pulsating DC voltage at the output end. The pulsating value depends on the capacity of C2 and the load current. The larger the capacity of C2, the smaller the pulsating value.

[0049] The rectified DC voltage value is approximately the peak voltage of the AC voltage multiplied by the diode conduction voltage drop coefficient.

[0050] The rectifier filter circuit 2 efficiently converts the AC voltage into a DC voltage, providing the required working voltage for the subsequent circuit. It adopts a simple diode rectifier circuit structure, which is small in size and low in cost. By properly selecting the filter capacitor, the ripple at the output end can be effectively reduced and the quality of the DC output can be improved. The diode has the characteristic of unidirectional conduction, which can prevent the load from reversely injecting energy and play a protective role. The output is a pulsating DC, which is easier to obtain a stable DC voltage through the subsequent voltage stabilization circuit.

[0051] The rectifier and filter circuit 2 utilizes the basic principles of diode rectification and capacitor filtering to efficiently convert AC voltage into pulsating DC voltage, providing power for the normal operation of the subsequent circuit. It has the advantages of simple structure, small size and low cost.

[0052] like Figure 4 As shown, the voltage stabilizing and protection circuit 3 includes resistors R1, R2, R3, R4, R5, R6, R7, capacitors C3, C4, voltage stabilizing diodes D2, D3, D4, D5, transistors Q1, Q2, Q3;

[0053] One end of the resistor R1 is electrically connected to the emitter of the transistor Q1 and the cathode of the Zener diode D3, the other end of the resistor R1 is electrically connected to the base of the transistor Q1, one end of the capacitor C4 and one end of the resistor R2, the collector of the transistor Q1 is connected to the other end of the capacitor C4, the cathode of the Zener diode D2, and one end of the resistor R5 is connected to a +12V voltage, the other end of the resistor R4 is electrically connected to one end of the capacitor C3, the other end of the resistor R2 is electrically connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the other end of the capacitor C3, and the resistor R5 The other end of the transistor, the collector of the transistor Q3, the anode of the Zener diode D5 and one end of the resistor R6 are electrically connected, the cathode of the Zener diode D5 is electrically connected to the anode of the Zener diode D4, the cathode of the Zener diode D4 is electrically connected to the anode of the Zener diode D3, the base of the transistor Q3 is electrically connected to the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 and the emitter of the transistor Q3 are grounded, the emitter of the transistor Q2 is electrically connected to one end of the resistor R3 and the anode of the Zener diode D2, and the other end of the resistor R3 is grounded.

[0054] It should be noted that:

[0055] The voltage stabilization and protection circuit 3 is mainly composed of three parts: a linear voltage stabilization circuit, a startup circuit and an overvoltage protection circuit.

[0056] Among them, the linear voltage regulator circuit: resistors R1, R2, R3, Zener diode D2, and transistor Q1 form a linear voltage regulator. When the output voltage is higher than the rated value, D2 breaks down, and the voltage drop on R3 increases, causing the conduction current of Q2 to decrease, which in turn causes the conduction degree of Q1 to decrease and the output voltage to drop. R4, C3, and C4 play a role in frequency compensation, improving the stability and response speed of the voltage regulator.

[0057] Startup circuit: R5, D3, D4, D5, and Q2 form a startup circuit. At the beginning of power-on, Q2 is cut off. When the AC input voltage increases, D3, D4, and D5 are broken down, Q2 is turned on, and the base of Q1 is pulled down, and Q1 is turned on. When the output voltage stabilizes, R5 continues to provide conduction current for Q2.

[0058] Overvoltage protection circuit: R6, R7, and Q3 form an overvoltage protection circuit. When the output voltage is too high, Q3 will be forward-conducted, thereby pulling down the base of Q2 and cutting off Q1, thus playing a protective role.

[0059] The linear voltage regulator circuit can accurately control the output voltage to ensure the normal operation of the subsequent circuit. The startup circuit ensures that the linear voltage regulator circuit can start normally. The overvoltage protection circuit can prevent the AC input voltage from being too high, thus protecting the communication power supply.

[0060] The compensation circuit improves the dynamic response and anti-interference ability of the regulator.

[0061] The voltage stabilization and protection circuit 3 provides a stable and reliable DC working power supply for the subsequent circuit through the coordinated work of functional modules such as linear voltage stabilization, startup circuit and overvoltage protection, ensuring the normal operation of the entire system.

[0062] like Figure 5 , which is an overall circuit wiring diagram of a communication power auxiliary power circuit of this embodiment;

[0063] Pin 4 of the transformer T1 is electrically connected to the anode of the diode D1 , and pin 3 of the transformer T1 is electrically connected to the cathode of the capacitor C2 .

[0064] The cathode of the diode D1 is electrically connected to the anode of the capacitor C2 and one end of the resistor R1.

[0065] It should be noted that:

[0066] A communication power auxiliary power circuit of this embodiment achieves: utilizing resonance energy to generate auxiliary power, saving costs; having a simple circuit and high reliability; and being associated with the main power circuit to protect the main power circuit.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A communication power auxiliary power circuit, characterized in that: It comprises an AC input circuit (1), a rectifier and filter circuit (2) and a voltage stabilization and protection circuit (3); The AC input circuit (1) is electrically connected to the rectifier and filter circuit (2) and is used to convert and transmit the electric energy of the AC power supply; The rectifier and filter circuit (2) is electrically connected to the AC input circuit (1) and the voltage stabilization and protection circuit (3), and is used to convert the AC voltage into a pulsating DC voltage; The voltage stabilization and protection circuit (3) is electrically connected to the rectifier and filter circuit (2) and is used to provide a stable DC working voltage and perform overvoltage protection; The AC input circuit (1) comprises a fuse F1, a capacitor C1 and a transformer T1; One end of the fuse F1 is electrically connected to the pin 1 of the transformer T1, and the other end of the fuse F1 is input with the resonant voltage, one end of the capacitor C1 is electrically connected to the pin 2 of the transformer T1, and the other end of the capacitor C1 is input with the resonant voltage; The rectification and filtering circuit (2) comprises a capacitor C2 and a diode D1; The cathode of the diode D1 is electrically connected to the anode of the capacitor C2, and the cathode of the capacitor C2 is grounded.

2. A communication power auxiliary power circuit as claimed in claim 1, characterized in that: Pin 4 of the transformer T1 is electrically connected to the anode of the diode D1 , and pin 3 of the transformer T1 is electrically connected to the cathode of the capacitor C2 .

3. A communication power auxiliary power circuit as claimed in claim 2, characterized in that: The voltage stabilizing and protection circuit (3) comprises resistors R1, R2, R3, R4, R5, R6, R7, capacitors C3, C4, voltage stabilizing diodes D2, D3, D4, D5, and transistors Q1, Q2, Q3; One end of the resistor R1 is electrically connected to the emitter of the transistor Q1 and the cathode of the Zener diode D3, the other end of the resistor R1 is electrically connected to the base of the transistor Q1, one end of the capacitor C4 and one end of the resistor R2, the collector of the transistor Q1 is connected to the other end of the capacitor C4, the cathode of the Zener diode D2, and one end of the resistor R5 is connected to a +12V voltage, the other end of the resistor R4 is electrically connected to one end of the capacitor C3, the other end of the resistor R2 is electrically connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the other end of the capacitor C3, and the resistor R5 The other end of the transistor, the collector of the transistor Q3, the anode of the Zener diode D5 and one end of the resistor R6 are electrically connected, the cathode of the Zener diode D5 is electrically connected to the anode of the Zener diode D4, the cathode of the Zener diode D4 is electrically connected to the anode of the Zener diode D3, the base of the transistor Q3 is electrically connected to the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R7 and the emitter of the transistor Q3 are grounded, the emitter of the transistor Q2 is electrically connected to one end of the resistor R3 and the anode of the Zener diode D2, and the other end of the resistor R3 is grounded.

4. A communication power auxiliary power circuit as claimed in claim 3, characterized in that: The cathode of the diode D1 is electrically connected to the anode of the capacitor C2 and one end of the resistor R1.

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