Low-frequency high-power switch

Abstract

The utility model provides a low-frequency high-power switch, which belongs to the technical field of switches and comprises a metal box body, a printed board is embedded in the metal box body, a transmission line is electroplated on one side of the outer wall of the printed board, one end of the transmission line is electrically connected with a radio frequency input end, and the other two ends of the transmission line are electrically connected with a radio frequency output end and a switch assembly. The switch assemblies are arranged on the outer wall of the printed board, the number of the switch assemblies is two, and each switch assembly comprises a first blocking capacitor, a second blocking capacitor, a third blocking capacitor, a first wire-wound magnetic core inductor, a second wire-wound magnetic core inductor, a third wire-wound magnetic core inductor, a first patch type diode and a second patch type diode. Through the switch assembly, the metal box body 1 is adopted for sealing treatment, external radiation can be shielded, the isolation degree among the paths can be improved, the parallel diodes can also improve the isolation degree among the paths, and the novel high-voltage switch further has the advantages of being easy to machine and simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and particularly relates to a low-frequency high-power switch. Background Technique

[0002] A low-frequency high-power switch mainly refers to a switch device that operates at a relatively low frequency in a circuit but can carry and transmit high power. Such switches are widely used in multiple fields. The following is a detailed analysis of its characteristics, applications, and precautions: Low-frequency operation: The main characteristic of a low-frequency high-power switch is its relatively low operating frequency, usually in the range of 50 Hz (such as the household power supply frequency) or lower. This means that they have better stability and efficiency when processing low-frequency signals. High-power carrying capacity: Such switches are designed to carry and transmit high-power current and voltage, and can meet the requirements of high-power devices. Durability and stability: Due to the need to carry high power, low-frequency high-power switches focus on durability and stability in design and manufacturing to ensure long-term reliable operation.

[0003] Currently, there are relatively few chip switches on the market operating at a 1 MHz frequency point, and they are relatively expensive, or the drive circuit is relatively complex, and it is more cumbersome to implement its functions, resulting in a relatively large volume. Larger volume: Compared with high-frequency switches, low-frequency high-power switches usually require larger-sized magnetic components such as transformers and inductors in design to meet the requirements of power transmission and conversion. This is because at low frequencies, magnetic components require more turns and larger sizes to store and release energy. Relatively low efficiency: During the switching process of low-frequency switches, due to the longer on and off times, more energy may be lost during the switching process, thus reducing the overall efficiency. In addition, the magnetic loss and copper loss of magnetic components at low frequencies may also be relatively high, further affecting the efficiency. Heat dissipation problem: High-power switches generate a large amount of heat during operation, and the low-frequency operating point may make the heat accumulation more significant because the switching cycle is long, and heat is continuously generated for a long time without being dissipated in time. Therefore, the heat dissipation design of low-frequency high-power switches needs to be more complex and large-scale. Slow dynamic response: Due to the low switching frequency, the response speed of low-frequency high-power switches may be slow when there are dynamic load changes, and they cannot meet application scenarios with strict requirements for fast response. Content of the Utility Model

[0004] The purpose of the utility model is to provide a low-frequency high-power switch, aiming to solve the problems raised in the background technique.

[0005] A low-frequency high-power switch includes

[0006] A metal box body;

[0007] A printed circuit board is embedded inside the metal box body, and a transmission line is electroplated on one side of the outer wall of the printed circuit board. One end of the transmission line is electrically connected to a radio frequency input terminal, and the remaining two ends of the transmission line are electrically connected to radio frequency output terminals;

[0008] A switch component is arranged on the outer wall of the printed circuit board. There are two switch components in total. Among them: each switch component includes a first DC-blocking capacitor, a second DC-blocking capacitor, a third DC-blocking capacitor, a first wire-wound core inductor, a second wire-wound core inductor, a third wire-wound core inductor, a first surface-mount diode, and a second surface-mount diode. The first DC-blocking capacitor is electrically connected to the radio frequency input terminal through a transmission line, the first DC-blocking capacitor is electrically connected to the first wire-wound core inductor through a transmission line, the first DC-blocking capacitor is electrically connected to the first surface-mount diode through a transmission line, the first surface-mount diode is electrically connected to the second wire-wound core inductor through a transmission line, the first surface-mount diode is electrically connected to the second DC-blocking capacitor through a transmission line, the second DC-blocking capacitor is electrically connected to the second surface-mount diode through a transmission line, the second surface-mount diode is electrically connected to the third wire-wound core inductor through a transmission line, the second DC-blocking capacitor is electrically connected to the third DC-blocking capacitor through a transmission line, and the third DC-blocking capacitor is electrically connected to the radio frequency output terminal through a transmission line.

[0009] Further, one ends of the first wire-wound core inductor, the second wire-wound core inductor, and the third wire-wound core inductor are all set as power supply terminals through transmission lines.

[0010] Further, the transmission line is a microstrip transmission line.

[0011] Further, the first wire-wound core inductor, the second wire-wound core inductor, and the third wire-wound core inductor are used to provide a continuous positive voltage.

[0012] Further, the second surface-mount diodes are connected in parallel to improve the isolation degree of the switch.

[0013] Further, the metal box body is used to shield external radiation.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] Through the switch component and the use of the metal box body for closed treatment, it can shield external radiation, improve the isolation degree between each path, and the parallel-connected diodes can also improve the isolation degree between each path. It also has the characteristics of simple processing and simple structure. Description of the Drawings

[0016] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is the front view of the printed circuit board of the present utility model;

[0018] Figure 2 is the schematic diagram of the circuit connection of the present utility model.

[0019] In the figure: 1, metal box body; 2, printed circuit board; 3, transmission line; 4, RF input terminal; 5, first DC-blocking capacitor; 501, second DC-blocking capacitor; 502, third DC-blocking capacitor; 6, first wire-wound core inductor; 601, second wire-wound core inductor; 602, third wire-wound core inductor; 7, first surface-mount diode; 701, second surface-mount diode; 8, RF output terminal. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] Please refer to Figure 1-2 , the technical solutions provided in this embodiment are as follows:

[0024] A low-frequency high-power switch includes

[0025] A metal box body 1;

[0026] A printed circuit board 2 is embedded inside the metal box body 1, and a transmission line 3 is electroplated on one side of the outer wall of the printed circuit board 2. One end of the transmission line 3 is electrically connected to a radio frequency input terminal 4, and the remaining two ends of the transmission line 3 are electrically connected to a radio frequency output terminal 8;

[0027] Switch components are arranged on the outer wall of the printed circuit board 2. There are two switch components in total. Among them: Each switch component includes a first DC-blocking capacitor 5, a second DC-blocking capacitor 501, a third DC-blocking capacitor 502, a first wire-wound core inductor 6, a second wire-wound core inductor 601, a third wire-wound core inductor 602, a first surface-mount diode 7 and a second surface-mount diode 701. The first DC-blocking capacitor 5 is electrically connected to the radio frequency input terminal 4 through the transmission line 3, the first DC-blocking capacitor 5 is electrically connected to the first wire-wound core inductor 6 through the transmission line 3, the first DC-blocking capacitor 5 is electrically connected to the first surface-mount diode 7 through the transmission line 3, the first surface-mount diode 7 is electrically connected to the second wire-wound core inductor 601 through the transmission line 3, the first surface-mount diode 7 is electrically connected to the second DC-blocking capacitor 501 through the transmission line 3, the second DC-blocking capacitor 501 is electrically connected to the second surface-mount diode 701 through the transmission line 3, the second surface-mount diode 701 is electrically connected to the third wire-wound core inductor 602 through the transmission line 3, the second DC-blocking capacitor 501 is electrically connected to the third DC-blocking capacitor 502 through the transmission line 3, and the third DC-blocking capacitor 502 is electrically connected to the radio frequency output terminal 8 through the transmission line 3.

[0028] In a specific embodiment of the present invention, through the switch component and the use of the metal box body 1 for enclosure treatment, the external radiation can be shielded, the isolation degree between each path can be improved, and the parallel diodes can also improve the isolation degree between each path. It also has the characteristics of simple processing and simple structure. The voltage of the anode of the surface-mount diode remains constant, and the on-off of the circuit is controlled by switching the voltage of the cathode of the surface-mount diode. When a low level is applied to the diode of the cathode of the surface-mount diode connected in series in the transmission line 3, the series-connected surface-mount diode conducts and is in a short-circuit state. At this time, the cathode of the parallel-connected surface-mount diode is at a high level, the parallel-connected surface-mount diode is cut off, and the surface-mount diode is in a cut-off state. Therefore, at this time, the electromagnetic wave can enter from the radio frequency input terminal 4, be transmitted along the transmission line 3, and the signal of the selected path passes through with almost no attenuation, and the signal reaches the radio frequency output terminal 8 smoothly, and almost no signal is output from other paths.

[0029] Specifically, one ends of the first wire-wound core inductor 6, the second wire-wound core inductor 601 and the third wire-wound core inductor 602 are all set as power supply terminals through the transmission line 3.

[0030] In a specific embodiment of the present utility model, a stable forward voltage supply can be achieved.

[0031] Specifically, the transmission line 3 is a microstrip transmission line.

[0032] In a specific embodiment of the present utility model, it is simple to manufacture and has low cost. The manufacturing process is simple: The microstrip line is printed with a conductor line on a dielectric substrate. One side is bonded to the substrate through a conductor, and the other side is exposed to the air. This structure makes the manufacturing of the microstrip line relatively simple and does not require complex technological steps. Low cost: Due to the simple manufacturing process, the required material and equipment costs are also relatively low, making it suitable for large-scale production and application. Flexible layout: The microstrip line can be flexibly arranged on the surface of the circuit board, facilitating connection and layout with other components, especially suitable for the application of surface mount devices. Easy to integrate: The microstrip line is easy to integrate with other microwave components, such as antennas, filters, etc., which is conducive to the miniaturization and modularization of the circuit. Suitable for high-frequency band transmission with excellent transmission performance: The microstrip line has good transmission performance in the high-frequency band, can support the transmission of high-speed signals, and meets the requirements of modern communication technology for transmission rate. Stable transmission mode: The microstrip line mainly transmits in the quasi-TEM mode, with a stable mode, which is conducive to ensuring the quality of signal transmission. Low time delay: The transmission time delay of the microstrip line is relatively small, which helps to reduce the time delay of the signal during transmission and improve the response speed of the system.

[0033] Specifically, the first wire-wound core inductor 6, the second wire-wound core inductor 601, and the third wire-wound core inductor 602 are used to provide a continuous forward voltage.

[0034] In the specific embodiments of the present utility model, the following benefits are mainly brought: Energy storage function: An inductor has an energy storage characteristic. When current passes through the inductor, a magnetic field will be generated around it, thereby storing energy. This energy storage function helps to provide stable current and voltage in the circuit, reducing voltage fluctuations. Filtering effect: When an inductor is used in combination with a capacitor, a low-pass filter or a high-pass filter can be formed to filter out unwanted frequency components and retain or enhance the desired signals. This is particularly important for providing a continuous positive voltage and can eliminate noise and interference in the voltage. Current limiting function: An inductor has a current limiting effect on alternating current and can limit the rate of change of current. In a DC circuit, when the voltage undergoes a transient change, the inductor can slow down the change of current, thereby maintaining the stability of the current and further maintaining the positive and stable voltage. Electromagnetic shielding: Core inductors usually have good electromagnetic shielding effects and can reduce the influence of external electromagnetic interference on the circuit. This helps to protect other components in the circuit from interference and ensure the stability and reliability of the voltage. Versatility: These inductors can be widely applied to various circuits that require stable voltage and current, such as power supply circuits, filtering circuits, signal amplification circuits, etc. They can be selected and adjusted according to different circuit requirements to provide the best voltage and current output. High Q value: Designs such as using core coils and multi-strand thick coils can increase the Q value (quality factor) of the inductor, that is, the ratio of the inductive reactance presented by the inductor when operating under an AC voltage of a certain frequency to its equivalent loss resistance. The higher the Q value, the smaller the loss of the inductor and the higher the efficiency, which helps to provide a more stable and efficient voltage output.

[0035] Specifically, the second surface-mounted diode 701 is connected in parallel to improve the isolation degree of the switch.

[0036] In the specific embodiments of the present utility model, to improve the isolation performance, Unidirectional conductivity: A diode has unidirectional conductivity, that is, it only allows current to pass through under a positive voltage and is cut off under a negative voltage. This characteristic enables the diode, when connected in parallel to a switch circuit, to effectively prevent the reverse current from passing through, thereby improving the isolation degree of the switch and reducing leakage: In high-frequency or high-voltage applications, there may be tiny leakage currents in the switch. By connecting a surface-mounted diode in parallel, these leakage currents can be significantly reduced, improving the isolation performance of the switch. Preventing reverse breakdown: When the switch is turned off, if there are energy storage components such as inductors in the circuit, they may generate a reverse electromotive force, which may damage the switch or other circuit components. By connecting a diode in parallel, a safe discharge path can be provided for these reverse electromotive forces, thereby protecting the circuit components from damage. Voltage stabilization: In some cases, the diode can also play a role in voltage stabilization. When the voltage in the circuit fluctuates, the diode can absorb or release excess energy, thereby maintaining the stability of the voltage.

[0037] Specifically, the metal box body 1 is used to shield external radiation.

[0038] In a specific embodiment of the present utility model, the metal box body 1 is used to shield external radiation, mainly bringing the following benefits: Prevent electromagnetic radiation leakage: The metal box body 1 can effectively block the electromagnetic radiation generated by internal electronic devices from leaking out, thereby protecting the surrounding environment and personnel from unnecessary electromagnetic interference. This shielding effect is of great significance for protecting sensitive devices, maintaining communication quality, and ensuring personnel health. Improve device performance: By reducing the leakage of electromagnetic radiation, the metal box body 1 helps to maintain the stability of the electromagnetic field inside the device, thereby improving the overall performance and reliability of the device. Resist external electromagnetic interference: The metal box body 1 can not only prevent internal radiation leakage, but also effectively resist the influence of external electromagnetic interference sources on the internal circuits of the device, including electromagnetic radiation generated by other electronic devices, radio transmitting stations, lightning, etc., ensuring that the device can still operate normally in a complex electromagnetic environment. Mechanical protection: In addition to the electromagnetic shielding effect, the metal box body 1 can also provide mechanical protection for internal electronic devices. It can resist the invasion of external factors such as impact, vibration, dust, and moisture, thereby extending the service life of the device.

[0039] Working principle:

[0040] Through the switch component, using the metal box body 1 for closed processing can shield external radiation, improve the isolation degree between each path. The parallel-connected diode can also improve the isolation degree between each path, and it also has the characteristics of simple processing and simple structure. The voltage of the anode of the surface-mounted diode remains constant, and the on-off of the circuit is controlled by switching the voltage of the cathode of the surface-mounted diode. When the diode of the cathode of the surface-mounted diode connected in series in the transmission line 3 is applied with a low level, the series-connected surface-mounted diode conducts and is in a short-circuit state. At this time, the cathode of the parallel-connected surface-mounted diode is applied with a high level, and the parallel-connected surface-mounted diode is cut off, and the surface-mounted diode is in a cut-off state. Therefore, at this time, the electromagnetic wave can enter from the RF input end 4, transmit along the transmission line 3, and the signal of the selected path passes through with almost no attenuation, and the signal reaches the RF output end 8 smoothly, and almost no signal is output from other paths.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A low-frequency high-power switch, characterized in that, including, a metal box body (1); a printed circuit board (2) is embedded inside the metal box body (1), and a transmission line (3) is electroplated on one side of the outer wall of the printed circuit board (2). One end of the transmission line (3) is electrically connected to a radio frequency input terminal (4), and the remaining two ends of the transmission line (3) are electrically connected to radio frequency output terminals (8); a switch assembly is arranged on the outer wall of the printed circuit board (2). There are two switch assemblies in total. Among them: each switch assembly includes a first DC-blocking capacitor (5), a second DC-blocking capacitor (501), a third DC-blocking capacitor (502), a first wire-wound core inductor (6), a second wire-wound core inductor (601), a third wire-wound core inductor (602), a first surface-mount diode (7) and a second surface-mount diode (701). The first DC-blocking capacitor (5) is electrically connected to the radio frequency input terminal (4) through the transmission line (3). The first DC-blocking capacitor (5) is electrically connected to the first wire-wound core inductor (6) through the transmission line (3). The first DC-blocking capacitor (5) is electrically connected to the first surface-mount diode (7) through the transmission line (3). The first surface-mount diode (7) is electrically connected to the second wire-wound core inductor (601) through the transmission line (3). The first surface-mount diode (7) is electrically connected to the second DC-blocking capacitor (501) through the transmission line (3). The second DC-blocking capacitor (501) is electrically connected to the second surface-mount diode (701) through the transmission line (3). The second surface-mount diode (701) is electrically connected to the third wire-wound core inductor (602) through the transmission line (3). The second DC-blocking capacitor (501) is electrically connected to the third DC-blocking capacitor (502) through the transmission line (3). The third DC-blocking capacitor (502) is electrically connected to the radio frequency output terminal (8) through the transmission line (3).

2. The low-frequency high-power switch according to claim 1, wherein , one ends of the first wire-wound core inductor (6), the second wire-wound core inductor (601) and the third wire-wound core inductor (602) are all set as power supply terminals through the transmission line (3).

3. A low-frequency high-power switch according to claim 2, characterized in that , the transmission line (3) is a microstrip transmission line.

4. The low-frequency high-power switch according to claim 3, characterized in that , the first wire-wound core inductor (6), the second wire-wound core inductor (601) and the third wire-wound core inductor (602) are used to provide a continuous positive voltage.

5. The low-frequency high-power switch according to claim 4, characterized in that , the second surface-mount diode (701) is connected in parallel to improve the isolation of the switch.

6. The low-frequency high-power switch according to claim 5, wherein , the metal box body (1) is used to shield external radiation.

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