Switch filter assembly

Abstract

The utility model relates to the technical field of switch filters, in particular to a switch filter assembly, which comprises a plurality of filters, a controller, a channel switching module and a monitoring module. The monitoring module monitors the working condition of each channel switching module in real time, and if a certain channel switching module breaks down and all channels are switched on, the monitoring module immediately controls all the channel switching modules to be in a switched-off state; according to the utility model, the filters are divided into the first-stage filter and the second-stage filter, and the channel switching module is arranged between the first-stage filter and the second-stage filter, so that the filter can receive various types of frequency signals, and can output different types of frequency signals. According to the utility model, the problem of the filter channel switching module in the aspect of stable control of channel connection and disconnection is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch filters, in particular to a switch filter component. Background Art

[0002] A filter is an electronic device that filters signals in a circuit. It can retain the required frequency signals and filter out other interfering frequency signals. Nowadays, filters play an important role in radio frequency systems. While selecting specific signals, filters also improve communication quality and avoid signal loss or distortion. However, after processing the signal, existing filters can usually only output a specific frequency signal. If you want to change the frequency of the output signal, you need to replace or adjust the filter, which is a cumbersome operation. Therefore, it is of great significance to solve the problem of how to adapt the filter to the output requirements of signals of different frequencies.

[0003] The Chinese utility model patent with the name of "A switching filter chip" and publication number CN209151131U has been made public. This utility model patent can dynamically switch filters to achieve processing and selection of signals in different frequency bands. However, if the control end of the channel switching circuit fails and all channels are connected, it is easy to cause output signal confusion. In serious cases, the system may experience equipment overload and increased safety risks. Utility Model Content

[0004] The purpose of the present application is to provide a switch filter component, which solves the problem of a filter channel switching module in stably controlling the connection and disconnection of a channel.

[0005] In order to solve the above problems, the solution adopted by this application is as follows:

[0006] The utility model provides a switch filter assembly, comprising a plurality of filters, a controller, and a channel switching module, wherein the channel switching module is connected to the filter and the controller respectively, and each filter is an independent channel; the utility model is characterized in that: a monitoring module is also included, and the controller is connected to the channel switching module through the monitoring module;

[0007] The monitoring module includes a fault judgment module, a start module, and an NOR gate, wherein the control end of the start module is connected to the control signal output end of the controller, and the signal output end of the start module is connected to an input end of the NOR gate;

[0008] The signal input end of the fault judgment module is connected to the control signal receiving end of the channel switching module, and the signal output end of the fault judgment module is connected to the other input end of the NOR gate;

[0009] The signal output end of the NOR gate is used as the signal output end of the monitoring module and is connected to the enable end of the channel switching module;

[0010] If the NOR gate outputs a high level, the channel switching module normally opens or closes the channel according to the control signal transmitted by the controller connected thereto;

[0011] If the NOR gate outputs a low level, no matter the controller outputs a high level or a low level to the channel switching module, the channel switching module turns off all channels.

[0012] In some embodiments, the channel switching module includes a first channel switching module, a second channel switching module, and a third channel switching module; the output end of the first channel switching module is connected to the input end of the filter; the second channel switching module is arranged between the filters; and the input end of the third channel switching module is connected to the output end of the filter.

[0013] In some embodiments, the filter includes multiple first-order filters and multiple second-order filters, and the multiple first-order filters process frequency signals in parallel, and the input ends of the multiple first-order filters are respectively connected to the multiple output ends of the first channel switching module, and the output ends of the multiple first-order filters are respectively connected to the multiple input ends of the second channel switching module; the multiple second-order filters process frequency signals in parallel, and the input ends of the multiple second-order filters are respectively connected to the multiple output ends of the second channel switching module, and the output ends of the multiple second-order filters are respectively connected to the multiple input ends of the third channel switching module.

[0014] In some embodiments, the channel switching module includes a field effect tube, the gate of the field effect tube serves as a control signal receiving end of the channel switching module; the source of the field effect tube is grounded; and the drain of the field effect tube serves as an output end of the channel switching module.

[0015] In some embodiments, the channel switching module also includes a driving circuit and an OR gate, the control end of the driving circuit is connected to the signal output end of the controller, and the signal output end of the driving circuit is connected to an input end of the OR gate; the other input end of the OR gate serves as an enable end of the channel switching module and is connected to the signal output end of the monitoring module; the output end of the OR gate is connected to the gate of the field effect transistor.

[0016] In some embodiments, the channel switching module further includes an LC filter circuit, an input end of the LC filter circuit is connected to the source of the field effect tube, and an output end of the LC filter circuit is grounded.

[0017] In some embodiments, a frequency detector is further included, and a signal output terminal of the frequency detector is connected to a signal receiving terminal of the controller.

[0018] The technical solution of the present application has at least the following advantages and beneficial effects:

[0019] 1. The utility model is provided with a monitoring module, which monitors the working conditions of each channel switching module in real time. If a channel switching module fails and all channels are connected, the monitoring module immediately controls all channel switching modules to be in a shut-off state, thereby protecting the filter and preventing the filter from being damaged;

[0020] 2. In the present invention, a second channel switching module is set up between the primary filter and the secondary filter. After different frequency signals select different primary filters for pre-processing, different secondary filters can also be selected for precise processing, so that the present invention can not only receive various types of frequency signals, but also output different types of frequency signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a signal flow diagram of the utility model;

[0022] Figure 2 This is the basic circuit diagram of the channel switching module of the utility model;

[0023] Figure 3 This is the circuit diagram of the monitoring module of the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. If the terms "center", "upper", "lower", "inner", "outer", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the figure, or the orientation or position relationship in which the product of the application is usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 of the present application. It should also be noted that unless otherwise clearly specified and limited, if the terms "set", "install", and "connect" appear, they should be understood in a broad sense, for example, it 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, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] Example 1

[0027] Please refer to Figure 1-Figure 3 The utility model provides a switching filter component, which is the same as the prior art, including multiple filters, controllers, and channel switching modules. The channel switching modules are respectively connected to the filters and the controllers. The channel switching modules include a first channel switching module, a second channel switching module, and a third channel switching module.

[0028] In the utility model, the filter adopts a multi-stage filtering structure, which includes a plurality of primary filters and a plurality of secondary filters, and the primary filter is connected in series with the secondary filter through a second switching channel module;

[0029] Multiple primary filters process frequency signals in parallel, and each primary filter is an independent channel; the input ends of the multiple primary filters are respectively connected to the multiple output ends of the first channel switching module, and the output ends of the multiple primary filters are respectively connected to the multiple input ends of the second channel switching module;

[0030] Multiple secondary filters process frequency signals in parallel, and each secondary filter is an independent channel; the input ends of the multiple secondary filters are respectively connected to the multiple output ends of the second channel switching module, and the output ends of the multiple secondary filters are respectively connected to the multiple input ends of the third channel switching module;

[0031] After different frequency signals are pre-processed by selecting different first-level filters through the first channel switching module, different second-level filters can be selected for precise processing through the second channel switching module. After the second-level filters are precisely processed, the frequency signals are output through the third channel switching module for use by subsequent circuits. The utility model can not only receive various types of frequency signals, but also output different types of frequency signals.

[0032] The controller includes a main control chip, which outputs a control signal to a channel switching module connected thereto to control the switching of channels where different filters are located; in this embodiment, the model of the main control chip selected is STM32F103C8T6.

[0033] In this embodiment, a frequency detector is further included, and the frequency detector is connected to the controller; the frequency detector detects the frequency of the frequency signal at the input end of the primary filter in real time and transmits the frequency data to the controller. After receiving the frequency data, the controller dynamically adjusts the working state of the first channel switching module so that the frequency signal enters the appropriate primary filter for filtering;

[0034] Frequency detectors belong to the prior art and will not be described in detail here.

[0035] In this embodiment, Figure 2 As shown, the basic circuit of the channel switching module includes a driving circuit, an OR gate, a field effect transistor, and an LC filter circuit; the first channel switching module, the second channel switching module, and the third channel switching module all use this basic circuit as a switch for each channel, thereby completing the switching of the channels;

[0036] Specifically, each channel switching module has several channels and corresponds to several basic circuits.

[0037] In the application of this embodiment, the first channel switching module includes two channels, each of which is composed of a basic circuit; the second channel switching module includes two channels, each of which is composed of a basic circuit; the third channel switching module includes two channels, each of which is composed of a basic circuit.

[0038] The control end of the drive circuit is connected to the signal output end of the controller, and the signal output end of the drive circuit is connected to an input end of the OR gate; the other input end of the OR gate is used as the channel switching module enable end and is connected to the signal output end of the monitoring module.

[0039] The gate of the field effect tube is used as the control signal receiving end of the channel switching module and is connected to the output end of the OR gate; the drain of the field effect tube is used as the output end of the channel switching module and is connected to the channel where the filter is located; the source of the field effect tube is grounded;

[0040] Preferably, the source of the field effect tube is connected to the input end of the LC filter circuit, and the output end of the LC filter circuit is grounded.

[0041] Furthermore, the basic circuit of the channel switching module includes an OR gate U6, a transistor Q2, a field effect transistor Q3, resistors R3 and R4, capacitors C1 and C2, and an inductor L. Among them, the driving circuit includes the transistor Q2, resistors R3 and R4; the LC filter circuit includes a capacitor C2 and an inductor L1;

[0042] Specifically, the base of the transistor Q2 is connected to the PA4 pin of the main control chip of the controller, and the collector of the transistor Q2 is connected to the power supply; the emitter of the transistor Q2, one end of the resistor R3, and one end of the resistor R4 are connected, the other end of the resistor R4 is grounded, and the other end of the resistor R3 is connected to the pin 2 of the OR gate U6; the pin 1 of the OR gate U6 is set as the IN_EN input terminal, which is connected to the output terminal of the monitoring module; the output terminal of the OR gate U6 is connected to the gate of the field effect tube Q3, and the output terminal is set at this connection, and it is called the C_OUT output terminal, which is connected to the input terminal of the monitoring module; the drain of the field effect tube Q3 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the channel where the filter is located; the source of the field effect tube Q3, one end of the capacitor C2, and one end of the inductor L1 are connected, the other end of the inductor L1 is grounded, and the other end of the capacitor C2 is grounded.

[0043] The PA4 pin of the main control chip continuously outputs a control signal to the transistor Q2, the transistor Q2 is turned on, and the pin 2 of the OR gate U6 receives a high level. Regardless of whether the IN_EN input terminal of the OR gate U6 is at a low level or a high level, the output terminal of the OR gate U6 outputs a high level and controls the field effect transistor Q3 to be turned on, thereby closing the exit or entrance of the channel where the basic circuit is located, so as to facilitate frequency signal filtering in other channels;

[0044] The IN_EN input terminal of the OR gate U6 is used as the enable terminal of the channel switching module. If the IN_EN input terminal of the OR gate U6 is at a high level, no matter the pin 2 of the OR gate U6 is at a low level or a high level, the output terminal of the OR gate U6 outputs a high level and closes the exit or entrance of the channel where the basic circuit is located, thereby protecting the filter in each channel;

[0045] If the IN_EN input terminal of the OR gate U6 and the pin 2 of the OR gate U6 are both at low levels, the field effect transistor Q3 is controlled to be turned off, and the exit or entrance of the channel where the basic circuit is located is turned on, then the filter in this channel can filter the received frequency signal.

[0046] Different from the prior art, the present invention further includes a monitoring module, through which the controller is connected to the channel switching module. The monitoring module includes a fault judgment module, a start module, and an NOR gate. The control end of the start module is connected to the control signal output end of the controller, and the signal output end of the start module is connected to an input end of the NOR gate; the signal output end of the NOR gate is used as the signal output end of the monitoring module and is connected to the enable end of the channel switching module; the signal input end of the fault judgment module is connected to the control signal receiving end of the channel switching module, and the signal output end of the fault judgment module is connected to the other input end of the NOR gate;

[0047] Specifically, Figure 3 As shown, the monitoring module includes XOR gates U1, U2, U3, AND gate U4, NOR gate U5, transistor Q1, resistors R1, R2; wherein the fault judgment module includes XOR gates U1, U2, U3, and AND gate U4; the starting module includes transistor Q1, resistors R1, R2;

[0048] Specifically, the A input terminals of the XOR gates U1, U2, and U3 are respectively set to the C1 input terminal, the C3 input terminal, and the C5 input terminal, and the C1 input terminal is connected to the C_OUT output terminal of the basic circuit of one channel in the first channel switching module, the C3 input terminal is connected to the C_OUT output terminal of the basic circuit of one channel in the second channel switching module, and the C5 input terminal is connected to the C_OUT output terminal of the basic circuit of one channel in the third channel switching module;

[0049] Specifically, the B input terminals of the XOR gates U1, U2, and U3 are respectively set to the C2 input terminal, the C4 input terminal, and the C6 input terminal, and the C2 input terminal is connected to the C_OUT output terminal of the basic circuit of another channel in the first channel switching module, the C4 input terminal is connected to the C_OUT output terminal of the basic circuit of another channel in the second channel switching module, and the C5 input terminal is connected to the C_OUT output terminal of the basic circuit of another channel in the third channel switching module;

[0050] Specifically, the Y output end of the XOR gate U1 is connected to pin 1 of the AND gate U4, the Y output end of the XOR gate U2 is connected to pin 2 of the AND gate U4, and the Y output end of the XOR gate U3 is connected to pin 3 of the AND gate U4; pin 4 of the AND gate U3 is connected to the A input end of the NOR gate U5; the base of the transistor Q1 is connected to pin PA3 of the main control chip of the controller, and the collector of the transistor Q1 is connected to the power supply; the emitter of the transistor Q1, one end of the resistor R1, and one end of the resistor R2 are connected, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to the B input end of the NOR gate U6; the Y output end of the NOR gate U6 is set to the OUT_EN output end and connected to the IN_EN input end of all basic circuits in the channel switching module.

[0051] The PA3 pin of the main control chip outputs a pulse control signal to the base of the transistor Q1, the transistor Q1 is turned on, the B input terminal of the NOR gate U5 receives a high level, the output terminal of the NOR gate U5 changes from a high level to a low level, and outputs a low level to the channel switching module, the channel switching module can work normally, and the monitoring module is in monitoring; at this time, the XOR gates U1, U2, and U3 also start to work. If the channel switching module is in normal working state, the output terminals of the XOR gates U1, U2, and U3 output a high level to the AND gate U4. When the three input terminals of the AND gate are all high levels, a high level signal is output to the A input terminal of the NOR gate U5. After the NOR gate U5 receives a high level, the Y output terminal continuously outputs a low level to the channel switching module;

[0052] If the two input ends of XOR gate U1, or the two input ends of XOR gate U2, or the two input ends of XOR gate U3 are all at low level, then one or more of the three XOR gates outputs a low level to AND gate U4; after the input end of AND gate U4 receives the low level output by one of the three XOR gates, AND gate U4 outputs a low level to NOR gate U5, and when the A input end of NOR gate U5 receives the low level and the B input end is also at a low level, the Y output end of NOR gate U5 changes from a high level to a low level, and outputs a low level to the channel switching module, cutting off all channels, thereby protecting the filters in each channel, and sending a signal to the main control chip to inform the fault information.

[0053] So far, various embodiments of the utility model have been described in detail. In order to avoid obscuring the concept of the utility model, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the utility model here, and the scope of the utility model is defined by the attached claims.

Claims

1. A switch filter assembly, comprising a plurality of filters, a controller, and a channel switching module, wherein the channel switching module is connected to the filter and the controller respectively, and each filter is an independent channel; characterized in that: It also includes a monitoring module, and the controller is connected to the channel switching module through the monitoring module; The monitoring module includes a fault judgment module, a start module, and an NOR gate, wherein the control end of the start module is connected to the control signal output end of the controller, and the signal output end of the start module is connected to an input end of the NOR gate; The signal input end of the fault judgment module is connected to the control signal receiving end of the channel switching module, and the signal output end of the fault judgment module is connected to the other input end of the NOR gate; The signal output end of the NOR gate is used as the signal output end of the monitoring module and is connected to the enable end of the channel switching module; If the NOR gate outputs a high level, the channel switching module normally opens or closes the channel according to the control signal transmitted by the controller connected thereto; If the NOR gate outputs a low level, no matter the controller outputs a high level or a low level to the channel switching module, the channel switching module turns off all channels.

2. A switch filter assembly according to claim 1, characterized in that: The channel switching module includes a first channel switching module, a second channel switching module, and a third channel switching module; the output end of the first channel switching module is connected to the input end of the filter; the second channel switching module is arranged between filters; and the input end of the third channel switching module is connected to the output end of the filter.

3. A switch filter assembly according to claim 2, characterized in that: The filter includes multiple first-order filters and multiple second-order filters. The multiple first-order filters process frequency signals in parallel, and the input ends of the multiple first-order filters are respectively connected to the multiple output ends of the first channel switching module, and the output ends of the multiple first-order filters are respectively connected to the multiple input ends of the second channel switching module; the multiple second-order filters process frequency signals in parallel, and the input ends of the multiple second-order filters are respectively connected to the multiple output ends of the second channel switching module, and the output ends of the multiple second-order filters are respectively connected to the multiple input ends of the third channel switching module.

4. A switch filter assembly according to claim 2, characterized in that: The channel switching module includes a field effect tube, the gate of the field effect tube serves as a control signal receiving end of the channel switching module; the source of the field effect tube is grounded; and the drain of the field effect tube serves as an output end of the channel switching module.

5. A switch filter assembly according to claim 4, characterized in that: The channel switching module also includes a driving circuit and an OR gate. The control end of the driving circuit is connected to the signal output end of the controller, and the signal output end of the driving circuit is connected to an input end of the OR gate; the other input end of the OR gate serves as an enable end of the channel switching module and is connected to the signal output end of the monitoring module; the output end of the OR gate is connected to the gate of the field effect tube.

6. A switch filter assembly according to claim 4, characterized in that: The channel switching module further includes an LC filter circuit, an input end of the LC filter circuit is connected to the source of the field effect tube, and an output end of the LC filter circuit is grounded.

7. A switch filter assembly according to claim 1, characterized in that: It also includes a frequency detector, a signal output end of the frequency detector is connected to a signal receiving end of the controller.

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