Power supply lightning protection device and power supply system
By designing an overvoltage blocking circuit and an overvoltage filtering circuit in the power supply circuit, the problem of insufficient protection of existing power supply circuits when facing large lightning strike energy is solved, and effective absorption and weakening of lightning strike energy is achieved.
Patent Information
- Application Number
- CN202510070371.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-04-25
AI Technical Summary
Existing power supply circuits are difficult to effectively resist and absorb when facing large lightning strike energy, resulting in insufficient protection.
A power supply lightning protection device is designed, including an overvoltage blocking circuit and an overvoltage filtering circuit. The overvoltage blocking circuit absorbs lightning energy through fuses and varistors, while the overvoltage filtering circuit weakens the remaining lightning strike through common mode inductors and safety capacitors.
This device can effectively withstand large lightning impacts, absorb most of the lightning energy, and weaken the remaining lightning strikes through the filter circuit, thereby achieving effective lightning protection for the power supply circuit.
Smart Images
Figure CN119891728A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of power supply circuits, and more specifically, to a power supply lightning protection device and a power supply system. Background Art
[0002] With the widespread application of power circuits, power circuits can provide electrical energy for various load devices, so that the load devices can operate normally. At present, the existing power circuits can absorb lightning energy through the configured varistor, but the lightning energy that this power circuit can withstand is limited and it is difficult to withstand larger lightning energy. Summary of the invention
[0003] An object of the present invention is to provide a power supply lightning protection device and a power supply system.
[0004] According to a first aspect of the present invention, there is provided a power supply lightning protection device, the device comprising:
[0005] an overvoltage blocking circuit, a first end of the overvoltage blocking circuit being connected to an input end of the device;
[0006] An overvoltage filtering circuit, wherein the first end of the overvoltage filtering circuit is connected to the second end of the overvoltage blocking circuit, the second end of the overvoltage filtering circuit is connected to the first connection end of the device, and the connection point between the first end of the overvoltage filtering circuit and the second end of the overvoltage blocking connection is connected to the second connection end of the device.
[0007] Optionally, the overvoltage blocking circuit includes:
[0008] a first fuse circuit, wherein a first end of the first fuse circuit is connected to a positive input terminal of the device;
[0009] a second fuse circuit, wherein a first end of the second fuse circuit is connected to a second end of the first fuse circuit, and the second end of the second fuse circuit is used as a second positive electrode of the overvoltage blocking circuit;
[0010] An overvoltage absorption circuit, wherein a first end of the overvoltage absorption circuit is connected to a second end of the first fuse circuit, and a second end of the overvoltage absorption circuit is connected to a negative input terminal of the device.
[0011] Optionally, the first fuse circuit is a first fuse, and the second fuse circuit is a second fuse;
[0012] Wherein, the fusing current of the first fuse is greater than or equal to the fusing current of the second fuse.
[0013] Optionally, the overvoltage absorption circuit is a varistor.
[0014] Optionally, the overvoltage blocking circuit further includes a thermistor, a first end of the thermistor is connected to the second end of the second fuse circuit, and the second end of the thermistor serves as a second positive electrode of the overvoltage blocking circuit.
[0015] Optionally, the overvoltage filtering circuit includes a common mode inductor, a first end of the common mode inductor serves as the first end of the overvoltage filtering circuit, and a second end of the common mode inductor serves as the second end of the overvoltage filtering circuit.
[0016] Optionally, the overvoltage filtering circuit further includes a safety capacitor, and the safety capacitor is connected between the positive electrode of the first end of the common-mode inductor and the negative electrode of the first end of the common-mode inductor.
[0017] According to a second aspect of the present invention, there is provided a power supply system, the system comprising:
[0018] A power supply lightning protection device, wherein the power supply lightning protection device is the power supply lightning protection device as described in the first aspect;
[0019] A first conversion device, wherein a first end of the first conversion device is connected to a first connection end of the power supply lightning protection device;
[0020] A primary control device, wherein a first end of the primary control device is connected to a second connection end of the power supply lightning protection device;
[0021] A transformer, wherein a first primary coil of the transformer is connected to a second end of the first conversion device, and a second primary coil of the transformer is connected to a second end of the primary control device.
[0022] Optionally, the system further comprises:
[0023] a second conversion device, wherein a first end of the second conversion device is connected to the secondary coil of the transformer, and a second end of the second conversion device is connected to the load end of the system;
[0024] A secondary side control device is arranged between the second conversion device and the secondary side coil of the transformer.
[0025] Optionally, the secondary side control device comprises a secondary side control chip, a first current limiting resistor and a second current limiting resistor;
[0026] Among them, the first end of the secondary control chip is connected to the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected to the first end of the secondary coil of the transformer, the second end of the secondary control chip is connected to the first end of the second current limiting resistor, and the second end of the second current limiting resistor is connected to the second end of the secondary coil of the transformer.
[0027] One technical effect of the present invention is that the power supply lightning protection device provided by the present invention can withstand larger lightning impacts while absorbing most of the lightning energy through the overvoltage blocking circuit, and then weaken the remaining lightning strikes through the overvoltage filtering circuit, thereby enabling the power supply lightning protection device to withstand larger lightning energy.
[0028] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.
[0030] Figure 1 It is a circuit diagram of the power supply system in an embodiment of the present application. DETAILED DESCRIPTION
[0031] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.
[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
[0033] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.
[0034] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0036] According to a power supply lightning protection device provided by the present application, Figure 1 As shown, the power supply lightning protection device may include an overvoltage blocking circuit and an overvoltage filtering circuit.
[0037] A first terminal of the overvoltage blocking circuit is connected to an input terminal of the device;
[0038] The first end of the overvoltage filtering circuit is connected to the second end of the overvoltage blocking circuit, the second end of the overvoltage filtering circuit is connected to the first connection end of the device, and the connection point between the first end of the overvoltage filtering circuit and the second end of the overvoltage blocking connection is connected to the second connection end of the device.
[0039] In this embodiment, the overvoltage blocking circuit can withstand larger lightning impacts while absorbing most of the lightning energy, and then the overvoltage filtering circuit can weaken the remaining lightning strikes, so that the power supply lightning protection device can withstand larger lightning energy.
[0040] In some embodiments, the overvoltage blocking circuit includes:
[0041] a first fuse circuit, a first end of the first fuse circuit being connected to the positive input terminal of the device;
[0042] a second fuse circuit, wherein a first end of the second fuse circuit is connected to a second end of the first fuse circuit, and the second end of the second fuse circuit is used as a second positive electrode of the overvoltage blocking circuit;
[0043] An overvoltage absorption circuit, wherein a first end of the overvoltage absorption circuit is connected to a second end of the first fuse circuit, and a second end of the overvoltage absorption circuit is connected to a negative input terminal of the device.
[0044] In this embodiment, by providing the first fuse circuit, a larger lightning strike can be resisted. By providing the second fuse circuit, a function of protecting the subsequent devices is played. By using the overvoltage absorption circuit, most of the lightning strike energy can be absorbed.
[0045] In some embodiments, in order to realize that the first fuse circuit can withstand a large lightning strike and the second fuse circuit can protect the subsequent devices, such as Figure 1 As shown, the first fuse circuit is the first fuse FU1, and the second fuse circuit is the second fuse FU2;
[0046] The fusing current of the first fuse FU1 is greater than or equal to the fusing current of the second fuse FU2.
[0047] In this embodiment, the fusing current of the first fuse FU1 is 6.3 A, that is, the first fuse FU1 can be blown at 6.3 A. The fusing current of the second fuse FU2 is 3.15 A, that is, the second fuse FU2 can be blown at 3.15 A.
[0048] In some embodiments, in order to realize that the overvoltage absorption circuit can absorb most of the lightning energy, such as Figure 1 As shown, the overvoltage absorption circuit is a varistor RV1.
[0049] In this embodiment, the model of the varistor RV1 is 14D621.
[0050] In some embodiments, Figure 1 As shown, the overvoltage blocking circuit further includes a thermistor RT1, a first end of the thermistor RT1 is connected to the second end of the second fuse circuit, and a second end of the thermistor RT1 serves as a second positive terminal of the overvoltage blocking circuit.
[0051] In this embodiment, by providing the thermistor RT1, which is provided after the second fuse FU2, it can play a better role in resisting lightning surges to further protect subsequent devices.
[0052] In some embodiments, Figure 1 As shown, the overvoltage filtering circuit includes a common mode inductor LF1, a first end of the common mode inductor LF1 serves as a first end of the overvoltage filtering circuit, and a second end of the common mode inductor LF1 serves as a second end of the overvoltage filtering circuit.
[0053] In this embodiment, by providing the common mode inductor LF1, it is possible to effectively weaken the lightning energy.
[0054] In some embodiments, Figure 1 As shown, the overvoltage filtering circuit further includes a safety capacitor CX1, and the safety capacitor CX1 is connected between the first positive terminal of the common mode inductor LF1 and the first negative terminal of the common mode inductor LF1.
[0055] In this embodiment, the safety capacitor CX1 can cooperate with the common mode inductor LF1 to further weaken the lightning energy.
[0056] According to a power supply system provided in the present application, the power supply system includes a power supply lightning protection device, a first conversion device 10, a primary side control device 20 and a transformer TR1.
[0057] The power supply lightning protection device is a power supply lightning protection device as in any of the above embodiments;
[0058] A first end of the first conversion device 10 is connected to a first connection end of the power supply lightning protection device;
[0059] The first end of the primary control device 20 is connected to the second connection end of the power supply lightning protection device;
[0060] The first primary coil of the transformer TR1 is connected to the second end of the first conversion device 10 , and the second primary coil of the transformer TR1 is connected to the second end of the primary control device 20 .
[0061] In this embodiment, the first conversion device 10 is an existing conversion circuit, and the first conversion device 10 can convert the alternating current output from the positive input terminal (AC / L) and the negative input terminal (AC / N) of the device into alternating current-to-alternating current. The primary control device 20 is an existing control circuit, and the primary control device 20 can control the conversion efficiency of the first conversion device 10 to enable the secondary coil of the transformer TR1 to output alternating current that meets the requirements.
[0062] In some embodiments, the system further comprises:
[0063] A second conversion device 30, wherein a first end of the second conversion device 30 is connected to the secondary coil of the transformer TR1, and a second end of the second conversion device 30 is connected to the load end of the system;
[0064] The secondary side control device is arranged between the second conversion device 30 and the secondary side coil of the transformer TR1.
[0065] In this embodiment, the second conversion device 30 is an existing conversion circuit, which can convert the alternating current output by the secondary coil into direct current that meets the requirements, so as to output the direct current that meets the requirements to the load device through the positive pole (OUT / V+) and the negative pole (OUT / V-) of the load end.
[0066] In some embodiments, the secondary side control device includes a secondary side control chip 40, a first current limiting resistor R22 and a second current limiting resistor R23;
[0067] Among them, the first end of the secondary control chip 40 is connected to the first end of the first current limiting resistor R22, the second end of the first current limiting resistor R22 is connected to the first end of the secondary coil of the transformer TR1, the second end of the secondary control chip 40 is connected to the first end of the second current limiting resistor R23, and the second end of the second current limiting resistor R23 is connected to the second end of the secondary coil of the transformer TR1.
[0068] In this embodiment, by providing the first current limiting resistor R22 and the second current limiting resistor R23 , the impact of abnormal current on the secondary control chip 40 can be limited, so as to improve the lightning resistance of the secondary control chip 40 .
[0069] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. A power supply lightning protection device, characterized in that: The device comprises: An overvoltage blocking circuit, the first end of the overvoltage blocking circuit is connected to an input end of the device; An overvoltage filtering circuit, wherein the first end of the overvoltage filtering circuit is connected to the second end of the overvoltage blocking circuit, the second end of the overvoltage filtering circuit is connected to the first connection end of the device, and the connection point between the first end of the overvoltage filtering circuit and the second end of the overvoltage blocking connection is connected to the second connection end of the device.
2. The power supply lightning protection device according to claim 1, characterized in that: The overvoltage blocking circuit comprises: The first fuse circuit is connected to the positive electrode of the input terminal of the device; a second fuse circuit, wherein a first end of the second fuse circuit is connected to a second end of the first fuse circuit, and the second end of the second fuse circuit is used as a second positive electrode of the overvoltage blocking circuit; An overvoltage absorption circuit is connected to a second end of the first fuse circuit, and a second end of the overvoltage absorption circuit is connected to an input negative electrode of the device.
3. The power supply lightning protection device according to claim 2, characterized in that: The first fuse circuit is a first fuse, and the second fuse circuit is a second fuse; Among them, the fuse current of the first fuse is greater than or equal to the fuse current of the second fuse.
4. The power supply lightning protection device according to claim 2, characterized in that The overvoltage absorption circuit is a varistor.
5. The power supply lightning protection device according to claim 2, characterized in that: The overvoltage blocking circuit further includes a thermistor, a first end of the thermistor is connected to the second end of the second fuse circuit, and the second end of the thermistor serves as a second positive terminal of the overvoltage blocking circuit.
6. The power supply lightning protection device according to claim 1, characterized in that: The overvoltage filtering circuit includes a common mode inductor, a first end of the common mode inductor serves as a first end of the overvoltage filtering circuit, and a second end of the common mode inductor serves as a second end of the overvoltage filtering circuit.
7. The power supply lightning protection device according to claim 6, characterized in that The overvoltage filtering circuit further includes a safety capacitor connected between a first terminal positive electrode of the common mode inductor and a first terminal negative electrode of the common mode inductor.
8. A power supply system, characterized in that: The system comprises: The power supply lightning protection device, the power supply lightning protection device is the power supply lightning protection device as claimed in any one of claims 1 to 7; The first conversion device is connected to the first connection end of the power supply lightning protection device; The primary side control device is connected to the first end of the primary side control device and the second connecting end of the power supply lightning protection device; The transformer is connected to the second end of the first conversion device, and the second primary coil of the transformer is connected to the second end of the primary control device.
9. The power supply system of claim 8, characterized in that The system further comprises: A second conversion device, a first end of the second conversion device is connected to a secondary coil of the transformer, and a second end of the second conversion device is connected to a load end of the system; The secondary edge control device is arranged between the second conversion device and the secondary edge coil of the transformer.
10. The power supply lightning protection system according to claim 8, characterized in that The secondary edge control device includes a secondary edge control chip, a first current limiting resistor and a second current limiting resistor; Among them, the first end of the secondary control chip is connected to the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected to the first end of the secondary coil of the transformer, the second end of the secondary control chip is connected to the first end of the second current limiting resistor, and the second end of the second current limiting resistor is connected to the second end of the secondary coil of the transformer.