Filtering driving circuit, YIG filtering device and tuning method

Abstract

The invention discloses a filtering driving circuit, a YIG filtering device and a tuning method, and the filtering driving circuit comprises a power supply control circuit which is used for providing a working power supply for a YIG filter. The power supply control circuit is used for outputting the first power supply VCC1 or the second power supply VCC2 to the YIG filter to serve as a working power supply of the YIG filter, and the voltage value of the second power supply VCC2 is larger than that of the first power supply VCC1. The power supply control circuit comprises a boost control module, and the boost control module is used for responding to a preset boost control signal UG and outputting a second power supply VCC2 input by the second connection end of the power supply control circuit to the YIG filter. As the power supply control circuit provides the working power supplies with different voltage values for the YIG filter, when the YIG filter needs to be tuned from low frequency to high frequency, the power supply with a higher voltage value is provided for the YIG filter, so that the YIG filter is fast and stable.

Description

Technical Field

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

[0002] A YIG filter is a tunable filter that adjusts the center frequency of the filter by tuning the current flowing through the filter coil. In the prior art, the filtering drive circuit of a YIG filter usually includes a DAC circuit and a voltage / current conversion circuit. The DAC circuit outputs a drive control signal U YIG to the voltage / current conversion circuit, and the voltage / current conversion circuit is connected to the YIG filter. Please refer to Figure 1 , which is a circuit connection schematic diagram of the YIG filter. The current / voltage conversion circuit 20 of the filtering drive circuit is connected to the equivalent circuit 10 representing the YIG filter. The filter 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 switching transistor Q0. The first pole of the first switching transistor Q0 is connected to the filter equivalent circuit 10, the control pole of the first switching transistor Q0 is connected to the output terminal of the conversion amplifier U0, and the second pole of the first switching transistor 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 for driving the input of the control signal U YIG . 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 the YIG filter can reach 50G, and the center frequency is proportional to the tuning current. The ratio of the center frequency to the tuning current is called the tuning sensitivity, usually dozens of MHz / mA. When the YIG filter needs to be tuned from a lower frequency to a higher frequency, the voltage value of the drive control signal jumps from a smaller value to a larger value. At the moment of voltage jump, the voltage difference on the tuning coil of the YIG filter is relatively large. As the current on the coil gradually increases, the voltage difference on the coil gradually decreases. According to the inductance current change formula: di / dt = V 0 / L 0 ; where, di / dt is the instantaneous change rate of the current on the inductor, V 0 is the voltage across the inductor, L 0 is the inductance value. If V 0 gradually decreases, the change rate of the current also gradually becomes smaller, resulting in a longer time for the current to stabilize to the final value.

[0004] When the YIG filter needs to be tuned from a higher frequency to a lower frequency, it is the reverse process described above. Similarly, the time for the current to stabilize to the final value is also longer. Therefore, it cannot meet the application requirements in high-speed switching frequency scenarios. Summary of the Invention

[0005] The technical problem to be solved by this application is how to effectively improve the tuning rate of the YIG filter through reasonable circuit design and tuning methods to meet the requirements of various application scenarios.

[0006] According to a first aspect, an embodiment provides a filtering drive circuit, including a power supply control circuit for providing a working power supply to the YIG filter. The power supply control circuit includes a first connection end, a second connection end, a third connection end, and a boost control module. The first connection end of the power supply control circuit is used for the input of the first power supply VCC1. The second connection end of the power supply control circuit is used for the input of the second power supply VCC2. The third connection end 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 of the YIG filter. The boost control module is connected between the second connection end and the third connection end of the power supply control circuit, and the boost control module is used to respond to a preset boost control signal U G to output the second power supply VCC2 input at the second connection end of the power supply control circuit to the YIG filter.

[0007] In an embodiment, the power supply control circuit further includes a first diode D0. The positive connection end of the first diode D0 is connected to the first connection end of the power supply control circuit, and the negative connection end of the first diode D0 is connected to the third connection end of the power supply control circuit. The first diode D0 is used to prevent the second power supply VCC2 input at the second connection end of the power supply control circuit from being reversely output to the first connection end of the power supply control circuit.

[0008] In an embodiment, the power supply control circuit further includes a current discharge module. The current discharge module includes a first connection end and a second connection end. The first connection end of the current discharge module is connected to the third connection end of the power supply control circuit, and the second connection end of the current discharge module is connected to the control output end 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.

[0009] In one embodiment, the boost control module includes a first boost switch tube M11, a first boost triode Q11, a first boost resistor R11, a second boost resistor R12, and a third boost resistor R13; The first pole of the first boost switch tube M11 is connected to the second connection end of the power supply control circuit, and the second pole of the first boost switch tube M11 is connected to the third connection end of the power supply control circuit; One end of the first boost resistor R11 is connected to the first pole of the first boost switch tube M11, and the other end is connected to the control pole of the first boost switch tube M11; One end of the second boost resistor R12 and one end of the third boost resistor R13 are electrically connected and are used for the input of the boost control signal U G . The other end of the second boost resistor R12 is connected to the base of the first boost triode Q11, and the other end of the third boost resistor R13 is grounded; The collector of the first boost triode Q11 is connected to the control stage of the first boost switch tube M11, and the emitter of the first boost triode Q11 is grounded; When the boost control signal U G is at a high level, the second power supply VCC2 provides the working power supply for the YIG filter, and when the boost control signal U G is at a low level, the first power supply VCC1 provides the working power supply for the YIG filter.

[0010] 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 connected in cascade, and both ends after the cascade connection are respectively connected to the first connection end and the second connection end of the current discharge module; the discharge control circuit is used to connect the diode bridge circuit between the working power supply and the control output end 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.

[0011] 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 end of the second diode D11 and the positive connection end of the third diode D12 are connected and serve as the positive input end of the diode bridge circuit; 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.

[0012] In one embodiment, the discharge control circuit includes a sixth diode D20; The positive connection terminal of the sixth diode D20 is connected to the positive input terminal of the diode bridge circuit, and the negative connection terminal of the sixth diode D20 is connected to the first connection terminal of the current discharge module; Alternatively, the positive connection terminal of the sixth diode D20 is connected to the second connection terminal of the current discharge module, and the negative connection terminal of the sixth diode D20 is connected to the negative input terminal of the diode bridge circuit.

[0013] In one embodiment, the discharge control circuit includes a first discharge switch tube M12, a first discharge triode Q12, a first discharge resistor R21, a second discharge resistor R22, and a third discharge resistor R23; The first pole of the first discharge switch tube M12 is connected to the first connection terminal of the current discharge module, and the second pole of the first discharge switch tube 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 pole of the first discharge switch tube M12, and the other end is connected to the control pole of the first discharge switch tube M12; One end of the second discharge resistor R22 and one end of the third discharge resistor R23 are electrically connected and are used for the input of a discharge switch control signal V YIG The other end of the second discharge resistor R22 is connected to the base of the first discharge triode Q12, and the other end of the third discharge resistor R23 is grounded; The collector of the first discharge triode Q12 is connected to the control stage of the first discharge switch tube M12, and the emitter of the first discharge triode Q12 is grounded; When the discharge switch control signal V YIG is at a high level, the discharge control circuit connects the diode bridge circuit between the working power supply and the control output terminal of the YIG filter; and when the discharge switch control signal V YIG is at a low level, the discharge control circuit disconnects the electrical connection between the diode bridge circuit and the working power supply of the YIG filter.

[0014] According to a second aspect, in one embodiment, a YIG filtering device is provided, including a YIG filter and a filtering drive circuit as described in the first aspect.

[0015] According to a third aspect, in an embodiment, a YIG filtering tuning method is provided, which is applied to the YIG filtering device as described in the second aspect. The YIG filtering 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 from the target current, switch back to the first power supply VCC1 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 quickly 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, disconnect the connection between the diode bridge circuit and the YIG filter to stop the current discharge.

[0016] According to the YIG filtering device of the above embodiment, since the power supply control circuit provides working 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 power supply with a higher voltage value is provided to the YIG filter, so that the YIG filter can quickly achieve current stability.

[0017] 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 in the case of a large voltage difference across the YIG tuning coil, so that when the center frequency of the YIG filter changes over a large range, current stability can be quickly achieved. Description of the Drawings

[0018] Figure 1 Schematic circuit connection diagram of the YIG filter; Figure 2 Schematic circuit connection diagram of a filtering drive circuit in an embodiment; Figure 3 Schematic circuit connection of a current discharge module in an embodiment; Figure 4 Schematic flow diagram of the YIG filtering tuning method in an embodiment; Figure 5 Schematic tuning flow diagram of the YIG filter in an embodiment; Figure 6 Schematic tuning flow diagram of the YIG filter in another embodiment. Detailed Embodiments

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0020] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0021] The serial numbers assigned to the components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling).

[0022] In an embodiment of the present application, a boost control module and a current discharge module are provided 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 voltage of the drive control signal U YIG jumps from a smaller value to a larger value. At this time, the boost control module provides a high-voltage working power supply VCC2 to the YIG filter. And when the YIG filter needs to be tuned from a higher frequency to a lower frequency, the voltage of the drive control signal U YIG jumps from a larger value to a smaller value. At this time, the current discharge module provides a large-current discharge path with a large voltage difference for the YIG tuning coil. So that the current on the tuning coil can be quickly stabilized when the center frequency of the YIG filter changes within a large range.

[0023] Embodiment 1: Please refer to Figure 2, which is a schematic diagram of the circuit connection of the filter driving circuit in another embodiment. The filter driving circuit includes a power supply control circuit 40 for providing a working power supply to the YIG filter. The power supply control circuit 40 includes a first connection end, a second connection end, a third connection end, and a boost control module. The first connection end of the power supply control circuit 40 is used for the input of the first power supply VCC1, the second connection end of the power supply control circuit 40 is used for the input of the second power supply VCC2, and the third connection end of the power supply control circuit 40 is used to connect to the YIG filter (filter equivalent circuit 10). Among them, the voltage value of the second power supply VCC2 is greater than that of the first power supply VCC1. The power supply control circuit 40 is used to output the first power supply VCC1 or the second power supply VCC2 to the YIG filter as the working power supply of the YIG filter. The boost control module 41 is connected between the second connection end and the third connection end 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 outputs the second power supply VCC2 input from the second connection end of the power supply control circuit 40 to the YIG filter. In one embodiment, the power supply control circuit 40 further includes a current discharge module 42. The current discharge module 42 includes a first connection end and a second connection end. The first connection end of the current discharge module 42 is connected to the third connection end of the power supply control circuit 40, and the second connection end of the current discharge module 42 is connected to the control output end 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.

[0024] In one embodiment, as Figure 2 shown, the boost control module includes a first boost switch tube M11, a first boost triode Q11, a first boost resistor R11, a second boost resistor R12, and a third boost resistor R13. The first pole of the first boost switch tube M11 is connected to the second connection end of the power supply control circuit 40, and the second pole of the first boost switch tube M11 is connected to the third connection end of the power supply control circuit 40. One end of the first boost resistor R11 is connected to the first pole of the first boost switch tube M11, and the other end is connected to the control pole of the first boost switch tube 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 input of the boost control signal U G . The other end of the second boost resistor R12 is connected to the base of the first boost triode Q11, and the other end of the third boost resistor R13 is grounded. The collector of the first boost triode Q11 is connected to the control stage of the first boost switch tube M11, and the emitter of the first boost triode Q11 is grounded. When the boost control signal U G is at a high level, the second power supply VCC2 provides the working power supply to the YIG filter. When the boost control signal U G is at a low level, the first power supply VCC1 provides the working power supply to the YIG filter.

[0025] In one embodiment, the power supply control circuit 40 further includes a first diode D0. The positive connection end of the first diode D0 is connected to the first connection end of the power supply control circuit 40, and the negative connection end of the first diode D0 is connected to the third connection end of the power supply control circuit 40. The first diode D0 is used to prevent the second power supply VCC2 input from the second connection end of the power supply control circuit 40 from being reversely output to the first connection end of the power supply control circuit 40.

[0026] 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 both ends after cascading are respectively connected to the first connection end and the second connection end of the current discharge module 42. The discharge control circuit 422 is used to connect the diode bridge circuit 421 between the working power supply and the control output end 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.

[0027] 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 ends of the second diode D11 and the third diode D12 are connected and serve as the positive input end of the diode bridge circuit 421. The negative connection ends of the second diode D11 and the third diode D12 are connected to the positive connection ends of the fourth diode D13 and the fifth diode D14. The negative connection ends of the fourth diode D13 and the fifth diode D14 are electrically connected and serve as the negative output end of the diode bridge circuit 421. Among them, the second diode D11, the third diode D12, the fourth diode D13, and the fifth diode D14 are zener diodes.

[0028] In one embodiment, the discharge control circuit 422 includes a sixth diode D20. In one embodiment, the positive connection end of the sixth diode D20 is connected to the positive input end of the diode bridge circuit 421, and the negative connection end of the sixth diode D20 is connected to the first connection end of the current discharge module 42. In one embodiment, the positive connection end of the sixth diode D20 is connected to the second connection end of the current discharge module 42, and the negative connection end of the sixth diode D20 is connected to the negative input end of the diode bridge circuit 421.

[0029] Please refer to Figure 3, which is a schematic diagram of the circuit connection of the current discharge module in an embodiment. In an embodiment of the present application, the discharge control circuit 422 includes a first discharge switch tube M12, a first discharge triode Q12, a first discharge resistor R21, a second discharge resistor R22, and a third discharge resistor R23. The first pole of the first discharge switch tube M12 is connected to the first connection end of the current discharge module 42, and the second pole of the first discharge switch tube 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 pole of the first discharge switch tube M12, and the other end is connected to the control pole of the first discharge switch tube M12. One end of the second discharge resistor R22 and one end of the third discharge resistor R23 are electrically connected and are used for the input of a discharge switch control signal V YIG , the other end of the second discharge resistor R22 is connected to the base of the first discharge triode Q12, and the other end of the third discharge resistor R23 is grounded. The collector of the first discharge triode Q12 is connected to the control stage of the first discharge switch tube M12, and the emitter of the first discharge triode Q12 is grounded. When the discharge switch control signal V YIG is at a high level, the discharge control circuit 422 connects the diode bridge circuit 421 between the working power supply and the control output terminal of the YIG filter. When the discharge switch control signal V YIG is at a low level, the discharge control circuit 422 disconnects the electrical connection between the diode bridge circuit 421 and the working power supply of the YIG filter.

[0030] In an embodiment of the present application, a YIG filtering device is also disclosed, which includes a YIG filter and a filtering drive circuit. Among them, the filtering drive circuit includes the power supply control circuit 40 described above.

[0031] Please refer to Figure 4 , which is a schematic flowchart of a YIG filtering tuning method in an embodiment. In this embodiment, a YIG filtering tuning method is also disclosed, which is applied to the YIG filtering device described above. The YIG filtering tuning method includes: Step 101, increase the working voltage.

[0032] 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. Among them, the voltage value of the second power supply VCC2 is greater than the voltage value of the first power supply VCC1.

[0033] Step 102, restore the working voltage.

[0034] When the tuning current of the YIG filter reaches a preset first proximity threshold from the target current, switch back to the first power supply VCC1 to supply power to the YIG filter.

[0035] Step 103, turn on the current discharge.

[0036] 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 quickly discharged through the diode bridge circuit of the current discharging module.

[0037] Step 104, stop discharging current.

[0038] When the tuning current of the YIG filter reaches a preset second proximity threshold from the target current, disconnect the connection between the diode bridge circuit and the working power supply of the YIG filter to stop discharging current.

[0039] To facilitate understanding of the working mode of the power supply control circuit disclosed in the embodiments of the present application, the following takes Figure 2 the shown filter driving circuit as an example to describe the tuning process of the YIG filter, which specifically includes: Please refer to Figure 5 , which is a schematic diagram of the tuning process of the YIG filter in an embodiment, including: Step 201, obtain the tuning instruction of the YIG filter, and execute Step 202 in response to the tuning instruction.

[0040] Step 202, determine whether to tune from a lower frequency to a higher frequency. When tuning from a lower frequency to a higher frequency, sequentially execute Step 203, Step 204, Step 205, Step 206 and Step 207. When tuning from a higher frequency to a lower frequency, sequentially execute Step 208 and Step 209.

[0041] Step 203, set the YIG filter drive current control signal to a preset value.

[0042] Step 204, set the boost control signal to a high level to turn on the boost module.

[0043] Step 205, wait for a preset time to ensure that the tuning current reaches the preset range.

[0044] Step 206, set the boost control signal to a low level to turn off the boost module.

[0045] Step 207, wait for a preset time to ensure that the YIG filter reaches a stable state.

[0046] Step 208, set the YIG filter drive current control signal to a preset value.

[0047] Step 209, wait for a preset time to ensure that the YIG filter reaches a stable state.

[0048] The following takes Figure 3 the shown filter driving circuit as an example to describe the tuning process of the YIG filter, which specifically includes: Please refer to Figure 6 , which is a schematic diagram of the tuning process of the YIG filter in another embodiment, including: Step 301: Obtain the tuning instruction of the YIG filter and execute Step 202 in response to the tuning instruction.

[0049] Step 302: Determine whether to tune from a lower frequency to a higher frequency. When tuning from a lower frequency to a higher frequency, execute Step 303, Step 304, Step 305, Step 306, and Step 307 in sequence. When tuning from a higher frequency to a lower frequency, execute Step 308, Step 309, Step 310, Step 311, and Step 312 in sequence.

[0050] Step 303: Set the drive current control signal of the YIG filter to a preset value.

[0051] Step 304: Set the boost control signal to high level to turn on the boost module.

[0052] Step 305: Wait for a preset time to ensure that the tuning current reaches the preset range.

[0053] Step 306: Set the boost control signal to low level to turn off the boost module.

[0054] Step 307: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0055] Step 308: Set the drive current control signal of the YIG filter to a preset value.

[0056] Step 309: Set the current discharge control signal to high level to turn on the current discharge path.

[0057] Step 310: Wait for a preset time to ensure that the tuning current reaches the preset range.

[0058] Step 311: Set the current discharge control signal to low level to turn off the current discharge path.

[0059] Step 312: Wait for a preset time to ensure that the YIG filter reaches a stable state.

[0060] To facilitate the understanding of the application mode of the YIG filter tuning method disclosed in the embodiments of the present application, the following is described through specific embodiments, including specifically: As Figure 2 shown, when the YIG filter is operating in a steady state, the boost control signal U G remains low level, the boost control module 41 is turned off, and the tuning current of the YIG filter is provided by the first power supply VCC1.

[0061] When the YIG filter needs to be tuned from a lower frequency to a higher frequency, the drive control signal U YIG jumps from a smaller value to a larger value. At the same time, the boost control signal U G changes from a low level to a high level, and the boost control module is turned on, switching to the second power supply VCC2 to supply power to the YIG filter. Since the voltage value of the first power supply VCC1 is less than that of the second power supply VCC2, the first diode D0 is reverse cut-off. At this time, the tuning current of the YIG filter is provided by the second power supply VCC2, and 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 in current on an inductor, di / dt = V / L, the rate of change of the current on the tuning coil will be faster. The larger the voltage value of the second power supply VCC2, the faster the rate of change of the current on the tuning coil. However, this also brings a problem, that is, the power consumption of the entire tuning circuit will increase, and the larger the voltage value of the second power supply VCC2, the more the power consumption increases, which poses challenges to heat dissipation and the frequency stability of the YIG filter (the center frequency of the YIG filter has a temperature drift, and the higher the temperature, the farther the center frequency drifts). Therefore, a step of restoring the operating voltage is set, that is, when the tuning current of the YIG filter reaches within a certain range of the target current, the boost control signal U G changes from a high level back to a low level again, turning off the boost control module 41, and the tuning current of the YIG filter is provided by the first power supply VCC1 again. This will slightly increase the tuning stability time, but greatly reduce the power consumption. In this way, the boost control module 41 is only turned on during the process of the tuning current changing from small to large and turned off after the tuning current reaches the preset value. The large-range frequency tuning of the YIG filter from a lower frequency to a higher frequency usually accounts for a small proportion in the operation of the YIG filter, so the average power consumption increase is not much. In one embodiment, the first proximity threshold is set by setting the high-level duration of the boost control signal U G to achieve.

[0062] When the YIG filter needs to be tuned from a higher frequency to a lower frequency, the voltage value of the drive control signal U YIG jumps from a larger value to a smaller value. At this time, the boost control signal U G remains at a low level, and the boost control module 41 is turned off. The current on the YIG tuning coil will be quickly 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 undergo avalanche breakdown as zener diodes, so that a large-current discharge path with a large voltage difference can be provided for the YIG tuning coil. In one embodiment, at Figure 2In the shown discharge control circuit 422, the second proximity threshold is set by setting the avalanche breakdown parameters of the second diode D11, the third diode D12, the fourth diode D13, and the fifth diode D14. The working principle of the current discharge module is as follows: when the driving control voltage at the control output end of the YIG filter changes from small to large instantaneously, the voltage at the control output end of the YIG filter will increase, while the voltage value of the power supply connection end of the YIG filter is electrically connected to the first power supply VCC1 and remains unchanged. When the increased voltage value at the control output end of the YIG filter is greater than the voltage value of the power supply connection end, and the difference is greater than the avalanche breakdown voltage value 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, and the current discharge module realizes the discharge path for the YIG filter.

[0063] In one embodiment, in Figure 3 the shown discharge control circuit, the second proximity threshold is set by setting the high-level duration of the discharge switch control signal V YIG .

[0064] According to the formula di / dt = V / L, the greater the voltage difference across the current discharge module, the faster the current on the tuning coil is discharged. The zener diode can be selected with a higher stable voltage model, and the voltage difference across the current discharge module can also be increased by a series connection. In Figure 2 the shown current discharge module 42 uses a series + parallel connection of 4 zener diodes to ensure that the rated power of the zener diode meets the requirements while providing a large voltage difference. It should be noted that the definitions of the lower frequency and the higher frequency of the center frequency of the YIG filter should be determined according to the characteristics of the actually used device, and different models of YIG filters may require different definitions.

[0065] In the above embodiment, one is to add a new high-voltage power supply to the original power supply circuit of the YIG filter to increase the voltage difference across the tuning coil of the YIG filter, thereby reducing the stabilization time for the YIG filter to tune from a lower frequency to a higher frequency. The other is to increase the zener diode in parallel on the tuning coil. When the current on the tuning coil changes from large to small, the voltage difference across the tuning coil of the YIG filter is increased, and at the same time, the diode provides a current discharge path, thereby reducing the stabilization time for the YIG filter to tune from a higher frequency to a lower frequency. Therefore, the filtering drive circuit disclosed in this embodiment can not only reduce the stabilization time for the YIG filter to tune from a lower frequency to a higher frequency, but also reduce the stabilization time for the YIG filter to tune from a higher frequency to a lower frequency.

[0066] The filtering drive circuit disclosed in this embodiment includes a power supply control circuit for providing a working power supply to the YIG filter. A boost control module and a current discharge module are provided in the power supply control circuit. When the center frequency of the YIG filter needs to be tuned from a low frequency to a high frequency, when the voltage value of the drive control signal jumps from a small value to a large value, the boost control module provides a high-voltage working power supply to the YIG filter. 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 pressure difference for the YIG tuning coil. When the current on the tuning coil changes within a large range at the center frequency of the YIG filter, rapid stability can be achieved.

[0067] Those skilled in the art can understand that all or part of the functions of the above-mentioned methods can be implemented in a hardware manner or in a computer program manner. When all or part of the functions in the above-mentioned embodiments are implemented in a computer program manner, the program can be stored in a computer-readable storage medium. The storage medium can include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc. The above functions can be realized by a computer executing this program. For example, the program is stored in the memory of the device. When the processor executes the program in the memory, the above-mentioned all or part of the functions can be realized. In addition, when all or part of the functions in the above-mentioned embodiments are implemented in a computer program manner, the program can also be stored in a storage medium such as a server, another computer, magnetic disk, optical disk, flash drive or mobile hard disk, and saved to the memory of the local device by downloading or copying, or the system of the local device is updated. When the processor executes the program in the memory, the above-mentioned all or part of the functions in the above-mentioned embodiments can be realized.

[0068] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art of the present invention, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A filter driving circuit, characterized in that: It includes a power supply control circuit, and the power supply control circuit is used to provide working 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 for inputting the first power supply VCC1; The second connection terminal of the power supply control circuit is used for inputting a 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 to serve as the working power supply of the YIG filter; The boost control module is connected between the second connection terminal and the third connection terminal 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 source VCC2 inputted into the second connection terminal of the power supply control circuit is outputted to the YIG filter.

2. The filter driving circuit according to claim 1, characterized in that: The power supply control circuit also includes a first diode D0, a positive connection end of the first diode D0 is connected to the first connection end of the power supply control circuit, and a negative connection end of the first diode D0 is connected to the third connection end of the power supply control circuit. The first diode D0 is used to prevent the second power supply VCC2 input at the second connection end of the power supply control circuit from being reversely output to the first connection end of the power supply control circuit.

3. The filter driving circuit according to claim 1, characterized in that: The power supply control circuit also includes a current discharge module; The current discharge module includes a first connection end and a second connection end, the first connection end of the current discharge module is connected to the third connection end of the power supply control circuit, and the second connection end of the current discharge module is connected to the control output end of the YIG filter; The current discharge module is used to establish a fast discharge path when the YIG tuning coil of the YIG filter needs to be discharged.

4. The filter driving circuit according to claim 3, characterized in that: The boost control module includes a first boost switch tube M11, a first boost transistor Q11, a first boost resistor R11, a second boost resistor R12 and a third boost resistor R13; The first electrode of the first boost switch tube M11 is connected to the second connection end of the power supply control circuit, and the second electrode of the first boost switch tube M11 is connected to the third connection end of the power supply control circuit; One end of the first boost resistor R11 is connected to the first electrode of the first boost switch tube M11, and the other end is connected to the control electrode of the first boost switch tube M11; One end of the second boost resistor R12 is electrically connected to one end of the third boost resistor R13 and is used for the boost control signal U G The other end 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 tube M11, and the emitter of the first boost transistor Q11 is grounded; When the boost control signal U G When the voltage-boosting control signal U G When it is at a low level, the first power supply VCC1 provides working power to the YIG filter.

5. The filter driving circuit according to claim 4, characterized in that: The current discharge module also includes a diode bridge circuit and a discharge control circuit. The discharge control circuit and the diode bridge circuit are connected in cascade, and the two ends of the cascade connection are respectively connected to the first connection end and the second connection end of the current discharge module; the discharge control circuit is used to connect the diode bridge circuit between the working power supply and the control output end of the YIG filter when the YIG tuning coil of the YIG filter needs to be discharged, so as to quickly discharge the YIG tuning coil of the YIG filter.

6. The filter driving circuit according to claim 5, 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 end of the second diode D11 is connected to the positive connection end of the third diode D12 and serves as the positive input end of the diode bridge circuit; The negative connection ends of the second diode D11 and the third diode D12 are connected to the positive connection ends of the fourth diode D13 and the fifth diode D14; The negative connection end of the fourth diode D13 and the negative connection end of the fifth diode D14 are electrically connected and serve as the negative output end of the diode bridge circuit.

7. The filter driving circuit according to claim 6, characterized in that: The discharge control circuit includes a sixth diode D20; The positive connection end of the sixth diode D20 is connected to the positive input end of the diode bridge circuit, and the negative connection end of the sixth diode D20 is connected to the first connection end of the current discharge module; Alternatively, the positive connection end of the sixth diode D20 is connected to the second connection end of the current discharge module, and the negative connection end of the sixth diode D20 is connected to the negative input end of the diode bridge circuit.

8. The filter driving circuit according to claim 5, characterized in that: The discharge control circuit includes a first discharge switch tube M12, a first discharge transistor Q12, a first discharge resistor R21, a second discharge resistor R22 and a third discharge resistor R23; The first electrode of the first discharge switch tube M12 is connected to the first connection end of the current discharge module, and the second electrode of the first discharge switch tube M12 is connected to the positive input end of the diode bridge circuit; One end of the first discharge resistor R21 is connected to the first electrode of the first discharge switch tube M12, and the other end is connected to the control electrode of the first discharge switch tube M12; One end of the second discharge resistor R22 is electrically connected to one end of the third discharge resistor R23 and is used to discharge a switch control signal V YIG The other end of the second discharge resistor R22 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 discharge transistor Q12 is connected to the control stage of the first discharge switch tube M12, and the emitter of the first discharge transistor Q12 is grounded; When the discharge switch control signal V YIG When the discharge control circuit connects the diode bridge circuit between the working power supply and the control output terminal of the YIG filter; and when the discharge switch control signal V YIG When it is at a low level, the discharge control circuit disconnects the electrical connection between the diode bridge circuit and the working power supply of the YIG filter.

9. A YIG filter device, characterized in that: The invention comprises a YIG filter and a filter driving circuit as claimed in any one of claims 1 to 8.

10. A YIG filter tuning method, characterized in that: Applied to the YIG filter device as claimed in claim 9, the YIG filter tuning method comprises: 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 value 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 quickly discharged through the diode bridge circuit of the current discharge module; When the YIG filter tuning current reaches a preset second proximity threshold value from the target current, the connection between the diode bridge circuit and the YIG filter is disconnected to stop the leakage current.

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