Filter drive circuit, YIG filter device and tuning method

Abstract

This application discloses a filter driving circuit, a YIG filter device, and a tuning method. The filter driving circuit includes a power supply control circuit for providing operating power to the YIG filter. The power supply control circuit outputs either a first power supply VCC1 or a second power supply VCC2 to the YIG filter as its operating power supply, wherein the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1. The power supply control circuit includes a boost control module, which responds to a preset boost control signal U. G The second power supply VCC2, input to the second connection terminal of the power supply control circuit, is output to the YIG filter. Because the power supply control circuit provides different voltage values ​​to the YIG filter, when the YIG filter needs to be tuned from a low frequency to a high frequency, a higher voltage value is provided to the YIG filter, enabling the YIG filter to achieve rapid stabilization.

Description

Technical Field

[0001] This application relates to the field of electronic measuring instruments and meters, specifically to a filter drive circuit, a YIG filter device, and a tuning method. Background Technology

[0002] A YIG filter is a tunable filter whose center frequency is adjusted by tuning the current flowing through the filter coil. In existing technology, the filter drive circuit of a YIG filter typically includes a DAC circuit and a voltage-to-current converter circuit. The DAC circuit outputs a drive control signal U. YIG Provide a voltage / current conversion circuit, which is connected to a YIG filter. Please refer to [reference needed]. Figure 1 This is a circuit connection diagram of a YIG filter. The current / voltage conversion circuit 20 of the filter drive circuit is connected to the equivalent circuit 10 representing the YIG filter. The equivalent circuit 10 is the equivalent circuit of the resonant coil of the YIG filter. The voltage / current conversion circuit includes a conversion amplifier U0, a first resistor R1 (sampling resistor), and a first switch Q0. The first terminal of the first switch Q0 is connected to the filter equivalent circuit 10, the control terminal of the first switch Q0 is connected to the output terminal of the conversion amplifier U0, and the second terminal of the first switch Q0 is connected to the negative input terminal of the conversion amplifier U0. The positive input terminal of the conversion amplifier U0 is connected to the DAC circuit and used to drive the control signal U. YIG The input is the first resistor R1. One end of the first resistor R1 is grounded, and the other end is connected to the negative input terminal of the conversion amplifier U0.

[0003] The tuning range of a YIG filter can reach 50 GHz, and its center frequency is directly proportional to the tuning current. The ratio of center frequency to tuning current is called the tuning sensitivity, which is typically tens of MHz / mA. When the YIG filter needs to be tuned from a lower frequency to a higher frequency, the driving control signal voltage jumps from a small value to a large value. At the instant of the voltage jump, the voltage difference across the YIG filter tuning coil is large. As the current in the coil gradually increases, the voltage difference gradually decreases. According to the inductor current change formula:

[0004] di / dt = V0 / L0;

[0005] Where di / dt is the instantaneous rate of change of the current in the inductor, V0 is the voltage across the inductor, and L0 is the inductance value. If V0 gradually decreases, the rate of change of the current also gradually decreases, resulting in a longer time for the current to stabilize to its final value.

[0006] When a YIG filter needs to be tuned from a higher frequency to a lower frequency, the process is the reverse of the above; similarly, the time for the current to stabilize to its final value is also longer. Therefore, it cannot meet the requirements for applications in high-speed frequency switching scenarios. Summary of the Invention

[0007] The technical problem this application aims to solve is how to effectively improve the tuning rate of YIG filters through reasonable circuit design and tuning methods to meet the needs of various application scenarios.

[0008] According to a first aspect, one embodiment provides a filter driving circuit, including a power supply control circuit, the power supply control circuit being used to provide operating power to a YIG filter;

[0009] The power supply control circuit includes a first connection terminal, a second connection terminal, a third connection terminal, and a boost control module;

[0010] The first connection terminal of the power supply control circuit is used as the input of the first power supply VCC1;

[0011] The second connection terminal of the power supply control circuit is used as the input of the second power supply VCC2;

[0012] The third connection terminal of the power supply control circuit is used to connect to the YIG filter; wherein the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1.

[0013] The power supply control circuit is used to output the first power supply VCC1 or the second power supply VCC2 to the YIG filter as the working power supply for the YIG filter.

[0014] The boost control module is connected between the second and third connection terminals of the power supply control circuit, and the boost control module is used to respond to a preset boost control signal U. G The second power supply VCC2, which is input to the second connection terminal of the power supply control circuit, is output to the YIG filter.

[0015] In one embodiment, the power supply control circuit further includes a first diode D0, the positive connection terminal of the first diode D0 being connected to a first connection terminal of the power supply control circuit, and the negative connection terminal of the first diode D0 being connected to a third connection terminal of the power supply control circuit. The first diode D0 is used to prevent the second power supply VCC2 input at the second connection terminal of the power supply control circuit from being output in reverse to the first connection terminal of the power supply control circuit.

[0016] In one embodiment, the power supply control circuit further includes a current discharge module;

[0017] The current discharge module includes a first connection terminal and a second connection terminal. The first connection terminal of the current discharge module is connected to the third connection terminal of the power supply control circuit, and the second connection terminal of the current discharge module is connected to the control output terminal of the YIG filter.

[0018] The current discharge module is used to establish a fast discharge path when it is necessary to discharge the YIG tuning coil of the YIG filter.

[0019] In one embodiment, the boost control module includes a first boost switch M11, a first boost transistor Q11, a first boost resistor R11, a second boost resistor R12, and a third boost resistor R13;

[0020] The first terminal of the first boost switching transistor M11 is connected to the second terminal of the power supply control circuit, and the second terminal of the first boost switching transistor M11 is connected to the third terminal of the power supply control circuit.

[0021] One end of the first boost resistor R11 is connected to the first terminal of the first boost switch M11, and the other end is connected to the control terminal of the first boost switch M11.

[0022] One end of the second boost resistor R12 and one end of the third boost resistor R13 are electrically connected and used for the boost control signal U. G The input of the second boost resistor R12 is connected to the base of the first boost transistor Q11, and the other end of the third boost resistor R13 is grounded.

[0023] The collector of the first boost transistor Q11 is connected to the control stage of the first boost switch M11, and the emitter of the first boost transistor Q11 is grounded.

[0024] When the boost control signal U G When the signal is high, the second power supply VCC2 provides operating power to the YIG filter, and when the boost control signal U... G When the voltage is low, the first power supply VCC1 provides operating power to the YIG filter.

[0025] In one embodiment, the current discharge module further includes a diode bridge circuit and a discharge control circuit. The discharge control circuit and the diode bridge circuit are cascaded, and their two ends are respectively connected to the first connection terminal and the second connection terminal of the current discharge module. The discharge control circuit is used to connect the diode bridge circuit between the operating power supply and the control output terminal of the YIG filter when it is necessary to discharge the YIG tuning coil of the YIG filter, so as to quickly discharge the YIG tuning coil of the YIG filter.

[0026] In one embodiment, the diode bridge circuit 421 includes a second diode D11, a third diode D12, a fourth diode D13, and a fifth diode D14;

[0027] The positive connection terminal of the second diode D11 is connected to the positive connection terminal of the third diode D12, and serves as the positive input terminal of the diode bridge circuit.

[0028] The negative terminals of the second diode D11 and the third diode D12 are connected to the positive terminals of the fourth diode D13 and the fifth diode D14.

[0029] The negative connection terminal of the fourth diode D13 and the negative connection terminal of the fifth diode D14 are electrically connected and serve as the negative output terminal of the diode bridge circuit.

[0030] In one embodiment, the discharge control circuit includes a sixth diode D20;

[0031] The positive terminal of the sixth diode D20 is connected to the positive input terminal of the diode bridge circuit, and the negative terminal of the sixth diode D20 is connected to the first terminal of the current discharge module.

[0032] Alternatively, the positive terminal of the sixth diode D20 is connected to the second terminal of the current discharge module, and the negative terminal of the sixth diode D20 is connected to the negative input terminal of the diode bridge circuit.

[0033] In one embodiment, the discharge control circuit includes a first discharge switch M12, a first discharge transistor Q12, a first discharge resistor R21, a second discharge resistor R22, and a third discharge resistor R23;

[0034] The first terminal of the first discharge switch transistor M12 is connected to the first connection terminal of the current discharge module, and the second terminal of the first discharge switch transistor M12 is connected to the positive input terminal of the diode bridge circuit.

[0035] One end of the first discharge resistor R21 is connected to the first terminal of the first discharge switch transistor M12, and the other end is connected to the control terminal of the first discharge switch transistor M12.

[0036] One end of the second bleeder resistor R22 and one end of the third bleeder resistor R23 are electrically connected and used for a bleeder switch control signal V. YIG The input is connected to the second discharge resistor R22, the other end of which is connected to the base of the first discharge transistor Q12, and the other end of the third discharge resistor R23 is grounded.

[0037] The collector of the first bleeder transistor Q12 is connected to the control stage of the first bleeder switch transistor M12, and the emitter of the first bleeder transistor Q12 is grounded.

[0038] When the discharge switch control signal V YIGWhen the signal is high, the discharge control circuit connects the diode bridge circuit between the operating power supply and control output of the YIG filter; and when the discharge switch control signal V... YIG When the voltage is low, the discharge control circuit disconnects the diode bridge circuit from the power supply of the YIG filter.

[0039] According to a second aspect, one embodiment provides a YIG filtering device, including a YIG filter and a filter driving circuit as described in the first aspect.

[0040] According to a third aspect, one embodiment provides a YIG filter tuning method applied to the YIG filter device as described in the second aspect, the YIG filter tuning method comprising:

[0041] When the center frequency of the YIG filter is tuned from a low frequency to a high frequency, the power supply of the YIG filter is switched from the first power supply VCC1 to the second power supply VCC2; wherein the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1.

[0042] When the tuning current of the YIG filter reaches a preset first proximity threshold at a distance from the target current, the first power supply VCC1 is switched back to supply power to the YIG filter.

[0043] When the center frequency of the YIG filter is tuned from a high frequency to a low frequency, the YIG tuning coil of the YIG filter is rapidly discharged through the diode bridge circuit of the current discharge module.

[0044] When the tuning current of the YIG filter reaches a preset second proximity threshold from the target current, the connection between the diode bridge circuit and the YIG filter is disconnected to stop the leakage.

[0045] According to the YIG filter device in the above embodiment, since the power supply control circuit provides operating power supplies with different voltage values ​​to the YIG filter, when the YIG filter needs to be tuned from a low frequency to a high frequency, a higher voltage power supply is provided to the YIG filter so that the YIG filter can quickly achieve current stabilization.

[0046] Furthermore, when the YIG filter needs to be tuned from a high frequency to a low frequency, the current discharge module in the power supply control circuit provides a large current discharge path for the large voltage difference across the YIG tuning coil, so that the current can be quickly stabilized when the center frequency of the YIG filter changes over a wide range. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the circuit connection for a YIG filter.

[0048] Figure 2This is a schematic diagram of the circuit connection of the filter driving circuit in one embodiment;

[0049] Figure 3 This is a schematic diagram of the circuit connection of the current discharge module in one embodiment;

[0050] Figure 4 This is a flowchart illustrating a YIG filter tuning method in one embodiment.

[0051] Figure 5 This is a schematic diagram of the tuning process of a YIG filter in one embodiment;

[0052] Figure 6 This is a schematic diagram of the tuning process of the YIG filter in another embodiment. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0054] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0055] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0056] In this embodiment, a boost control module and a current discharge module are included in the power supply control circuit for the YIG filter. When the YIG filter needs to be tuned from a lower frequency to a higher frequency, the drive control signal U... YIGWhen the voltage jumps from a smaller value to a larger value, the boost control module provides a high-voltage operating power supply VCC2 to the YIG filter. Conversely, when the YIG filter needs to be tuned from a higher frequency to a lower frequency, the drive control signal U... YIG When the voltage jumps from a large value to a small value, the current discharge module provides a large current discharge path with a large voltage difference for the YIG tuning coil. This allows the current in the tuning coil to stabilize quickly when the center frequency of the YIG filter changes over a wide range.

[0057] Example 1:

[0058] Please refer to Figure 2 This is a circuit connection diagram of a filter driving circuit in another embodiment. The filter driving circuit includes a power supply control circuit 40, which provides operating power to the YIG filter. The power supply control circuit 40 includes a first connection terminal, a second connection terminal, a third connection terminal, and a boost control module. The first connection terminal of the power supply control circuit 40 is used as the input of a first power supply VCC1, the second connection terminal is used as the input of a second power supply VCC2, and the third connection terminal is used to connect to the YIG filter (filter equivalent circuit 10). The voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1. The power supply control circuit 40 is used to output either the first power supply VCC1 or the second power supply VCC2 to the YIG filter as the operating power supply for the YIG filter. The boost control module 41 is connected between the second and third connection terminals of the power supply control circuit 40, and the boost control module 41 is used to respond to a preset boost control signal U. G The second power supply VCC2 input to the second connection terminal of the power supply control circuit 40 is output to the YIG filter. In one embodiment, the power supply control circuit 40 further includes a current discharge module 42, which includes a first connection terminal and a second connection terminal. The first connection terminal of the current discharge module 42 is connected to the third connection terminal of the power supply control circuit 40, and the second connection terminal of the current discharge module 42 is connected to the control output terminal of the YIG filter. The current discharge module 42 is used to establish a fast discharge path when it is necessary to discharge the YIG tuning coil of the YIG filter.

[0059] In one embodiment, such as Figure 2The boost control module shown includes a first boost switch M11, a first boost transistor Q11, a first boost resistor R11, a second boost resistor R12, and a third boost resistor R13. The first terminal of the first boost switch M11 is connected to the second terminal of the power supply control circuit 40, and the second terminal of the first boost switch M11 is connected to the third terminal of the power supply control circuit 40. One end of the first boost resistor R11 is connected to the first terminal of the first boost switch M11, and the other end is connected to the control terminal of the first boost switch M11. One end of the second boost resistor R12 and one end of the third boost resistor R13 are electrically connected and used for the boost control signal U. G The input of the first boost transistor is connected to the base of the second boost resistor R12, and the other end of the third boost resistor R13 is grounded. The collector of the first boost transistor Q11 is connected to the control stage of the first boost switch M11, and the emitter of the first boost transistor Q11 is grounded. When the boost control signal U... G When the signal is high, the second power supply VCC2 provides operating power to the YIG filter. When the boost control signal U... G When the voltage is low, the first power supply VCC1 provides operating power to the YIG filter.

[0060] In one embodiment, the power supply control circuit 40 further includes a first diode D0, the positive connection terminal of the first diode D0 is connected to the first connection terminal of the power supply control circuit 40, and the negative connection terminal of the first diode D0 is connected to the third connection terminal of the power supply control circuit 40. The first diode D0 is used to prevent the second power supply VCC2 input to the second connection terminal of the power supply control circuit 40 from being output in reverse to the first connection terminal of the power supply control circuit 40.

[0061] In one embodiment, the current discharge module 42 further includes a diode bridge circuit 421 and a discharge control circuit 422. The discharge control circuit 422 and the diode bridge circuit 421 are cascaded, and their two ends are respectively connected to the first connection terminal and the second connection terminal of the current discharge module 42. The discharge control circuit 422 is used to connect the diode bridge circuit 421 between the operating power supply and the control output terminal of the YIG filter when it is necessary to discharge the YIG tuning coil of the YIG filter, so as to quickly discharge the YIG tuning coil of the YIG filter.

[0062] In one embodiment, the diode bridge circuit 421 includes a second diode D11, a third diode D12, a fourth diode D13, and a fifth diode D14. The positive connection terminals of the second diode D11 and the third diode D12 are connected and serve as the positive input terminal of the diode bridge circuit 421. The negative connection terminals of the second diode D11 and the third diode D12 are connected to the positive connection terminals of the fourth diode D13 and the fifth diode D14. The negative connection terminals of the fourth diode D13 and the fifth diode D14 are electrically connected and serve as the negative output terminal of the diode bridge circuit 421. The second diode D11, the third diode D12, the fourth diode D13, and the fifth diode D14 are Zener diodes.

[0063] In one embodiment, the discharge control circuit 422 includes a sixth diode D20. In one embodiment, the positive terminal of the sixth diode D20 is connected to the positive input terminal of the diode bridge circuit 421, and the negative terminal of the sixth diode D20 is connected to the first connection terminal of the current discharge module 42. In another embodiment, the positive terminal of the sixth diode D20 is connected to the second connection terminal of the current discharge module 42, and the negative terminal of the sixth diode D20 is connected to the negative input terminal of the diode bridge circuit 421.

[0064] Please refer to Figure 3 This is a circuit connection diagram of a current discharge module in one embodiment. In one embodiment of this application, the discharge control circuit 422 includes a first discharge switch transistor M12, a first discharge transistor Q12, a first discharge resistor R21, a second discharge resistor R22, and a third discharge resistor R23. The first terminal of the first discharge switch transistor M12 is connected to the first connection terminal of the current discharge module 42, and the second terminal of the first discharge switch transistor M12 is connected to the positive input terminal of the diode bridge circuit 421. One end of the first discharge resistor R21 is connected to the first terminal of the first discharge switch transistor M12, and the other end is connected to the control terminal of the first discharge switch transistor M12. One end of the second discharge resistor R22 and one end of the third discharge resistor R23 are electrically connected and used for a discharge switch control signal V. YIG The input is connected to the first discharge transistor Q12, with the other end of the second discharge resistor R22 connected to the base of the first discharge transistor Q12, and the other end of the third discharge resistor R23 grounded. The collector of the first discharge transistor Q12 is connected to the control stage of the first discharge switch transistor M12, and the emitter of the first discharge transistor Q12 is grounded. When the discharge switch control signal V... YIG When the signal is high, the bleeder control circuit 422 connects the diode bridge circuit 421 between the operating power supply and control output of the YIG filter. When the bleeder switch control signal V... YIG When the level is low, the discharge control circuit 422 disconnects the diode bridge circuit 421 from the power supply of the YIG filter.

[0065] In one embodiment of this application, a YIG filtering device is also disclosed, including a YIG filter and a filter driving circuit, wherein the filter driving circuit includes the power supply control circuit 40 as described above.

[0066] Please refer to Figure 4 This is a flowchart illustrating a YIG filter tuning method in one embodiment. This embodiment also discloses a YIG filter tuning method applied to the YIG filter device described above. The YIG filter tuning method includes:

[0067] Step 101: Increase the operating voltage.

[0068] When the center frequency of the YIG filter is tuned from a low frequency to a high frequency, the power supply for the YIG filter is switched from the first power supply VCC1 to the second power supply VCC2. The voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1.

[0069] Step 102: Restore the operating voltage.

[0070] When the tuning current of the YIG filter reaches a preset first proximity threshold at a distance from the target current, the power supply VCC1 is switched back to supply power to the YIG filter.

[0071] Step 103: Start the venting.

[0072] When the center frequency of the YIG filter is tuned from a high frequency to a low frequency, the diode bridge circuit of the current discharge module rapidly discharges the YIG tuning coil of the YIG filter.

[0073] Step 104: Stop the flow.

[0074] When the tuning current of the YIG filter reaches a preset second proximity threshold from the target current, the connection between the diode bridge circuit and the YIG filter power supply is disconnected to stop the leakage.

[0075] To facilitate understanding of the operation of the power supply control circuit disclosed in the embodiments of this application, the following will use... Figure 2 The tuning process of a YIG filter is described using the filter drive circuit shown as an example, specifically including:

[0076] Please refer to Figure 5 This is a schematic diagram of the tuning process of a YIG filter in one embodiment, including:

[0077] Step 201: Obtain the tuning command of the YIG filter and execute step 202 in response to the tuning command.

[0078] Step 202: Determine whether the frequency is being tuned from a lower frequency to a higher frequency. If the frequency is being tuned from a lower frequency to a higher frequency, execute steps 203, 204, 205, 206, and 207 sequentially. If the frequency is being tuned from a higher frequency to a lower frequency, execute steps 208 and 209 sequentially.

[0079] Step 203: Set the YIG filter drive current control signal to a preset value.

[0080] Step 204: Set the boost control signal to high level to turn on the boost module.

[0081] Step 205: Wait for a preset time to ensure that the tuning current reaches the preset range.

[0082] Step 206: Set the boost control signal to low level and turn off the boost module.

[0083] Step 207: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0084] Step 208: Set the YIG filter drive current control signal to a preset value.

[0085] Step 209: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0086] The following is based on Figure 3 The tuning process of a YIG filter is described using the filter drive circuit shown as an example, specifically including:

[0087] Please refer to Figure 6 The diagram below illustrates the tuning process of a YIG filter in another embodiment, including:

[0088] Step 301: Obtain the tuning command of the YIG filter and execute step 202 in response to the tuning command.

[0089] Step 302: Determine whether to tune from a lower frequency to a higher frequency. If it is a tune from a lower frequency to a higher frequency, execute steps 303, 304, 305, 306, and 307 in sequence. If it is a tune from a higher frequency to a lower frequency, execute steps 308, 309, 310, 311, and 312 in sequence.

[0090] Step 303: Set the YIG filter drive current control signal to a preset value.

[0091] Step 304: Set the boost control signal to high level to turn on the boost module.

[0092] Step 305: Wait for a preset time to ensure that the tuning current reaches the preset range.

[0093] Step 306: Set the boost control signal to low level and turn off the boost module.

[0094] Step 307: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0095] Step 308: Set the YIG filter drive current control signal to a preset value.

[0096] Step 309: Set the current discharge control signal to high level to open the current discharge path.

[0097] Step 310: Wait for a preset time to ensure that the tuning current reaches the preset range.

[0098] Step 311: Set the current discharge control signal to low level to close the current discharge path.

[0099] Step 312: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0100] To facilitate understanding of the application of the YIG filter tuning method disclosed in the embodiments of this application, the following specific embodiments are described, including:

[0101] like Figure 2 As shown, when the YIG filter is operating in steady state, the boost control signal U G Maintaining a low level, the boost control module 41 is turned off, and the YIG filter tuning current is provided by the first power supply VCC1.

[0102] When the YIG filter needs to be tuned from a lower frequency to a higher frequency, the drive control signal U YIG The voltage value jumps from a smaller value to a larger value, and simultaneously, the boost control signal U... GThe voltage level changes from low to high, activating the boost control module and switching to the second power supply VCC2 to power the YIG filter. Since the voltage of the first power supply VCC1 is lower than that of the second power supply VCC2, the first diode D0 is reverse-biased and cut off. At this time, the tuning current of the YIG filter is provided by the second power supply VCC2. The voltage difference across the tuning coil of the YIG filter will be larger than when powered by the first power supply VCC1. According to the formula for the change of current in an inductor, di / dt=V / L, the rate of change of current in the tuning coil will be faster. The larger the voltage of the second power supply VCC2, the faster the rate of change of current in the tuning coil. However, this also brings a problem: the power consumption of the entire tuning circuit will increase, and the larger the voltage of the second power supply VCC2, the greater the increase in power consumption, which will pose a challenge to heat dissipation and the frequency stability of the YIG filter (the center frequency of the YIG filter has temperature drift; the higher the temperature, the further the center frequency deviates). Therefore, a recovery voltage step is set: when the tuning current of the YIG filter reaches a certain range from the target current, the boost control signal U... G The voltage level changes from high to low, shutting down the boost control module 41. The YIG filter tuning current is then supplied again by the first power supply VCC1. This slightly increases the tuning settling time but significantly reduces power consumption. In this way, the boost control module 41 is only turned on during the process of the tuning current increasing from a small to a large value, and turns off after the tuning current reaches a preset value. Since the wide-range frequency tuning from lower to higher frequencies of the YIG filter typically accounts for a small proportion of the YIG filter's operation, the increase in average power consumption is not significant. In one embodiment, the first proximity threshold is set by setting the boost control signal U. G This is achieved by maintaining a high-level duration.

[0103] When the YIG filter needs to be tuned from a higher frequency to a lower frequency, the drive control signal U... YIG The voltage value jumps from a larger value to a smaller value, at which point the boost control signal U... G Maintaining a low level, the boost control module 41 is turned off. The current in the YIG tuning coil is rapidly discharged through the current discharge module 42. The current discharge module 42 discharges through a diode bridge circuit. During the current discharge process, the second diode D11, the third diode D12, the fourth diode D13, and the fifth diode D14, acting as Zener diodes, undergo avalanche breakdown, thus providing a large current discharge path with a large voltage difference for the YIG tuning coil. In one embodiment, in Figure 2In the discharge control circuit 422 shown, the second proximity threshold is set by adjusting the avalanche breakdown parameters of the second diode D11, the third diode D12, the fourth diode D13, and the fifth diode D14. The current discharge module works as follows: when the drive control voltage at the YIG filter control output terminal increases instantaneously, the voltage at the YIG filter control output terminal rises. Since the YIG filter's operating power supply connection terminal is electrically connected to the first power supply VCC1, its voltage remains constant. When the voltage increase at the YIG filter control output terminal exceeds the voltage at the operating power supply connection terminal, and the difference exceeds the avalanche breakdown voltage of the Zener diode in the diode bridge circuit, the Zener diode in the diode bridge circuit undergoes avalanche breakdown, and the sixth diode D20 conducts forward. The current discharge module then establishes a discharge path for the YIG filter.

[0104] In one embodiment, in Figure 3 In the discharge control circuit shown, the second proximity threshold is set by setting the discharge switch control signal V. YIG This is achieved by maintaining a high-level duration.

[0105] According to the formula di / dt=V / L, the greater the voltage difference across the current discharge module, the faster the current in the tuning coil discharges. A Zener diode with a higher stable voltage can be selected, and the voltage difference across the current discharge module can be increased by connecting them in series. Figure 2 The current discharge module 42 shown uses four Zener diodes connected in series and parallel to ensure that the rated power of the Zener diodes meets the requirements when a large voltage drop is provided. It should be noted that the definitions of the lower and higher frequencies of the YIG filter's center frequency should be determined based on the characteristics of the actual device used; different models of YIG filters may require different definitions.

[0106] In the above embodiments, one approach is to add a new high-voltage power supply to the existing power supply circuit of the YIG filter, increasing the voltage difference across the YIG filter tuning coil, thereby reducing the settling time of the YIG filter from a lower frequency to a higher frequency. Another approach is to add a parallel Zener diode to the tuning coil. When the current in the tuning coil changes from high to low, the voltage difference across the YIG filter tuning coil increases, and the diode provides a current discharge path, thus reducing the settling time of the YIG filter from a higher frequency to a lower frequency. Therefore, the filter drive circuit disclosed in this embodiment can not only reduce the settling time of the YIG filter from a lower frequency to a higher frequency, but also reduce the settling time of the YIG filter from a higher frequency to a lower frequency.

[0107] The filter drive circuit disclosed in this embodiment includes a power supply control circuit for providing operating power to the YIG filter. The power supply control circuit includes a boost control module and a current discharge module. When the center frequency of the YIG filter needs to be tuned from a low frequency to a high frequency, and the drive control signal voltage value jumps from a small value to a large value, the boost control module provides a high-voltage operating power supply to the YIG filter. Conversely, when the YIG filter needs to be tuned from a high frequency to a low frequency, the current discharge module provides a large-current discharge path with a large voltage difference for the YIG tuning coil. This allows the current in the tuning coil to stabilize rapidly when the center frequency of the YIG filter changes over a wide range.

[0108] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0109] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A filter driving circuit, characterized in that, Includes a power supply control circuit, which is used to provide operating power to the YIG filter; The power supply control circuit includes a first connection terminal, a second connection terminal, a third connection terminal, and a boost control module; The first connection terminal of the power supply control circuit is used as the input of the first power supply VCC1; The second connection terminal of the power supply control circuit is used as the input of the second power supply VCC2; The third connection terminal of the power supply control circuit is used to connect to the YIG filter; wherein the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1. The power supply control circuit is used to output the first power supply VCC1 or the second power supply VCC2 to the YIG filter as the working power supply for the YIG filter. The boost control module is connected between the second and third connection terminals of the power supply control circuit, and the boost control module is used to respond to a preset boost control signal U. G The second power supply VCC2 input to the second connection terminal of the power supply control circuit is output to the YIG filter; The power supply control circuit also includes a current discharge module; The current discharge module includes a first connection terminal and a second connection terminal. The first connection terminal of the current discharge module is connected to the third connection terminal of the power supply control circuit, and the second connection terminal of the current discharge module is connected to the control output terminal of the YIG filter. The current discharge module is used to establish a fast discharge path when it is necessary to discharge the YIG tuning coil of the YIG filter.

2. The filter drive circuit as described in claim 1, characterized in that, The power supply control circuit further includes a first diode D0, the positive connection terminal of the first diode D0 is connected to the first connection terminal of the power supply control circuit, and the negative connection terminal of the first diode D0 is connected to the third connection terminal of the power supply control circuit. The first diode D0 is used to prevent the second power supply VCC2 input at the second connection terminal of the power supply control circuit from being output in reverse to the first connection terminal of the power supply control circuit.

3. The filter drive circuit as described in claim 1, characterized in that, The boost control module includes a first boost switching transistor M11, a first boost transistor Q11, a first boost resistor R11, a second boost resistor R12, and a third boost resistor R13; The first terminal of the first boost switching transistor M11 is connected to the second terminal of the power supply control circuit, and the second terminal of the first boost switching transistor M11 is connected to the third terminal of the power supply control circuit. One end of the first boost resistor R11 is connected to the first terminal of the first boost switch M11, and the other end is connected to the control terminal of the first boost switch M11. One end of the second boost resistor R12 and one end of the third boost resistor R13 are electrically connected and used for the boost control signal U. G The input of the second boost resistor R12 is connected to the base of the first boost transistor Q11, and the other end of the third boost resistor R13 is grounded. The collector of the first boost transistor Q11 is connected to the control stage of the first boost switch M11, and the emitter of the first boost transistor Q11 is grounded. When the boost control signal U G When the signal is high, the second power supply VCC2 provides operating power to the YIG filter, and when the boost control signal U... G When the voltage is low, the first power supply VCC1 provides operating power to the YIG filter.

4. The filter drive circuit as described in claim 3, characterized in that, The current discharge module further includes a diode bridge circuit and a discharge control circuit. The discharge control circuit and the diode bridge circuit are cascaded, and their two ends are respectively connected to the first connection terminal and the second connection terminal of the current discharge module. The discharge control circuit is used to connect the diode bridge circuit between the operating power supply and the control output terminal of the YIG filter when it is necessary to discharge the YIG tuning coil of the YIG filter, so as to quickly discharge the YIG tuning coil of the YIG filter.

5. The filter drive circuit as described in claim 4, characterized in that, The diode bridge circuit 421 includes a second diode D11, a third diode D12, a fourth diode D13, and a fifth diode D14; The positive connection terminal of the second diode D11 is connected to the positive connection terminal of the third diode D12, and serves as the positive input terminal of the diode bridge circuit. The negative terminals of the second diode D11 and the third diode D12 are connected to the positive terminals of the fourth diode D13 and the fifth diode D14. The negative connection terminal of the fourth diode D13 and the negative connection terminal of the fifth diode D14 are electrically connected and serve as the negative output terminal of the diode bridge circuit.

6. The filter drive circuit as described in claim 5, characterized in that, The discharge control circuit includes a sixth diode D20; The positive terminal of the sixth diode D20 is connected to the positive input terminal of the diode bridge circuit, and the negative terminal of the sixth diode D20 is connected to the first terminal of the current discharge module. Alternatively, the positive terminal of the sixth diode D20 is connected to the second terminal of the current discharge module, and the negative terminal of the sixth diode D20 is connected to the negative input terminal of the diode bridge circuit.

7. The filter drive circuit as described in claim 4, characterized in that, The discharge control circuit includes a first discharge switch M12, a first discharge transistor Q12, a first discharge resistor R21, a second discharge resistor R22, and a third discharge resistor R23; The first terminal of the first discharge switch transistor M12 is connected to the first connection terminal of the current discharge module, and the second terminal of the first discharge switch transistor M12 is connected to the positive input terminal of the diode bridge circuit. One end of the first discharge resistor R21 is connected to the first terminal of the first discharge switch transistor M12, and the other end is connected to the control terminal of the first discharge switch transistor M12. One end of the second bleeder resistor R22 and one end of the third bleeder resistor R23 are electrically connected and used for a bleeder switch control signal V. YIG The input is connected to the second discharge resistor R22, the other end of which is connected to the base of the first discharge transistor Q12, and the other end of the third discharge resistor R23 is grounded. The collector of the first bleeder transistor Q12 is connected to the control stage of the first bleeder switch transistor M12, and the emitter of the first bleeder transistor Q12 is grounded. When the discharge switch control signal V YIG When the signal is high, the discharge control circuit connects the diode bridge circuit between the operating power supply and control output of the YIG filter; and when the discharge switch control signal V... YIG When the voltage is low, the discharge control circuit disconnects the diode bridge circuit from the power supply of the YIG filter.

8. A YIG filter device, characterized in that, It includes a YIG filter and a filter drive circuit as described in any one of claims 1 to 7.

9. A YIG filter tuning method, characterized in that, Applied to the YIG filter device as described in claim 8, the YIG filter tuning method includes: When the center frequency of the YIG filter is tuned from a low frequency to a high frequency, the power supply of the YIG filter is switched from the first power supply VCC1 to the second power supply VCC2; wherein the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1. When the tuning current of the YIG filter reaches a preset first proximity threshold at a distance from the target current, the first power supply VCC1 is switched back to supply power to the YIG filter. When the center frequency of the YIG filter is tuned from a high frequency to a low frequency, the YIG tuning coil of the YIG filter is rapidly discharged through the diode bridge circuit of the current discharge module. When the tuning current of the YIG filter reaches a preset second proximity threshold from the target current, the connection between the diode bridge circuit and the YIG filter is disconnected to stop the leakage.

Images