Novel short-wave intelligent dummy load circuit

Abstract

The utility model provides a novel short-wave intelligent dummy load circuit, which relates to the technical field of load heat dissipation and comprises a radio frequency power amplifier module, a radio frequency coupling module, a rectifier module, a filter module, a direct current fan and a load module. According to the utility model, through the radio frequency coupling technology, on the basis that stable operation and effective heat dissipation of the load module are ensured, the effect of reducing energy consumption of the heat dissipation fan is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of load heat dissipation, and in particular to a novel short-wave intelligent dummy load circuit. Background Art

[0002] In the application of RF power amplifiers, short-wave intelligent dummy load circuits are often used to absorb and consume the RF power output by the power amplifier unit (operating frequency is 3-30 MHz). Since the load absorbs a large amount of RF power, the load will generate significant heat, so an effective heat dissipation mechanism is required to ensure the stability and safety of the load.

[0003] In the related art, AC fans are usually used to dissipate heat from the load. These AC fans generally need to be connected to a 220V AC power supply for independent power supply, and dissipate the heat generated by the load by supplying air to prevent the load temperature from being too high.

[0004] However, in actual operation, since the output power delivered to the load changes, the load temperature also changes accordingly. That is, the heat dissipation requirements of the load vary under different output powers. This may cause the fan to still run at full speed at low power output, and the heat dissipation air volume cannot be adjusted according to the actual load conditions, resulting in higher fan energy consumption. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a novel short-wave intelligent dummy load circuit that can reduce the energy consumption of a heat dissipation fan.

[0006] The above invention objectives of the present application are achieved through the following technical solutions:

[0007] The present application provides a novel short-wave intelligent dummy load circuit, which includes: a radio frequency power amplifier module, a radio frequency coupling module, a rectifier module, a filter module, a DC fan and a load module, wherein the radio frequency coupling module is connected to the radio frequency power amplifier module, the load module and the rectifier module respectively, and the rectifier module is connected to the DC fan via the filter module, wherein:

[0008] The RF power amplifier module is used to amplify the RF input signal into a RF output signal, so that the load module operates according to the RF output signal;

[0009] The radio frequency coupling module is used to obtain a first driving voltage according to the radio frequency output signal coupling;

[0010] The rectifier module is used to rectify the first driving voltage into a second driving voltage;

[0011] The filtering module is used to filter the second driving voltage to obtain a third driving voltage;

[0012] The DC fan is used to dissipate heat for the load module according to the third driving voltage.

[0013] By adopting the above technical solution, the rectifier module rectifies the first drive voltage to generate a second drive voltage. Subsequently, the filter module filters the second drive voltage to obtain a stable third drive voltage. The DC fan starts and adjusts the air volume according to the third drive voltage to dissipate heat for the load module. As a result, the operation of the DC fan is directly related to the output power of the RF power amplifier module. When the RF power amplifier module outputs a higher power, the first drive voltage obtained by coupling is larger, and the DC fan is finally driven to run at full power, providing a strong heat dissipation effect. Conversely, when the power amplifier unit outputs a lower power, the coupling voltage is smaller, and the DC fan also reduces the power operation, so that the air volume output by the DC fan can be automatically adjusted according to actual needs. Compared with the method of using independent power supply for heat dissipation in the related art, the present application uses radio frequency coupling technology to ensure the stable operation and effective heat dissipation of the load module, while achieving a significant reduction in fan energy consumption.

[0014] In a preferred example, the present application may be further configured as follows: the rectifier module includes a first rectifier diode and a second rectifier diode, wherein:

[0015] The anode of the first rectifier diode and the anode of the second rectifier diode are respectively connected to two ends of the radio frequency coupling module;

[0016] The cathode of the first rectifier diode and the cathode of the second rectifier diode are respectively connected to the filter module.

[0017] By adopting the above technical solution, the AC signal output by the RF coupling module can be effectively converted into a DC signal. The positive poles of the two diodes are connected to the two ends of the RF coupling module respectively, and the negative poles are connected to the filter module, making full use of the positive and negative half cycles of the RF signal to improve the rectification efficiency. In the positive half cycle, one diode is turned on and the other is turned off, and the opposite is true in the negative half cycle, ensuring that current passes through both the positive and negative half cycles to achieve full-wave rectification. This configuration not only improves the rectification efficiency, but also makes the output DC voltage more stable.

[0018] In a preferred example, the present application can be further configured as follows: the filtering module includes a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a choke coil, wherein:

[0019] The first end of the choke coil is connected to the cathode of the first rectifier diode and the cathode of the second rectifier diode respectively, the cathode of the first rectifier diode is grounded via the fourth capacitor, and the cathode of the second rectifier diode is grounded via the fifth capacitor;

[0020] The second end of the choke is connected to the DC fan, and the second end of the choke is connected to the ground in parallel via the third capacitor and the second capacitor respectively.

[0021] By adopting the above technical solution, the first end of the choke is connected to the negative poles of the two rectifier diodes as the input of the filter network, and the fourth capacitor and the fifth capacitor are grounded to form a primary filter, which quickly absorbs high-frequency components. The second end of the choke is connected to the DC fan, and the second capacitor and the third capacitor are connected to the ground in parallel to form a second-stage filter. As a low-pass filter, the choke has a small impedance to the DC component and a large impedance to the AC component, which effectively suppresses the remaining AC ripple. The parallel design of the second capacitor and the third capacitor further enhances the filtering effect and can absorb ripples in different frequency ranges. This multi-stage LC filter network design can gradually reduce the ripple, effectively handle interference in different frequency ranges, and convert the rectified pulsating DC signal into a stable DC voltage with an extremely low ripple factor, providing a reliable power supply for the DC fan to ensure its smooth operation and precise control.

[0022] In a preferred example, the present application can be further configured as follows: the third capacitor and the fifth capacitor are electrolytic capacitors.

[0023] By adopting the above technical solutions, the electrolytic capacitor has the characteristics of large capacity and low equivalent series resistance (ESR), which is very suitable for handling low-frequency ripple and high current applications. The fifth capacitor is the first-stage filter capacitor after rectification. Its large capacity characteristics can effectively absorb most of the low-frequency ripple after rectification and provide a relatively smooth basic voltage for the subsequent filter stage. The third capacitor is located at the last stage of the filter, connected between the second end of the choke and the ground, and its large capacity characteristics can further smooth the voltage fluctuations. This configuration can not only effectively suppress low-frequency ripples, but also provide stable DC output and reduce voltage fluctuations.

[0024] In a preferred example, the present application can be further configured as follows: the rectifier module further includes a second resistor, wherein:

[0025] The anode of the first rectifier diode is connected to the anode of the second rectifier diode via the second resistor.

[0026] By adopting the above technical solution, the second resistor has a current limiting protection function. When the RF signal power suddenly increases, it can effectively limit the peak current passing through the rectifier diode to prevent the diode from being damaged by instantaneous large current.

[0027] In a preferred example, the present application can be further configured as follows: the circuit further includes:

[0028] A calibration module is connected to the filter module and the DC fan respectively, and is used to calibrate the third driving voltage input to the DC fan.

[0029] By adopting the above technical solution, the calibration module can monitor and adjust the third driving voltage in real time to ensure that it always remains within the optimal working range. By accurately controlling the driving voltage, the energy consumption of the DC fan can be optimized and its service life can be extended.

[0030] In a preferred example, the present application can be further configured as follows: the calibration module includes a first resistor, a first capacitor and a power meter, wherein:

[0031] The first end of the first resistor is connected to the filter module and the DC fan respectively, and the second end of the first resistor is grounded via the first capacitor;

[0032] One end of the power meter is connected to the second end of the first resistor, and the other end of the power meter is grounded.

[0033] By adopting the above technical solution, the first resistor is used as a sampling resistor, and its first end is connected to the filter module and the DC fan, which can accurately reflect the voltage state of the input DC fan. The second end of the first resistor is grounded through the first capacitor to form a low-pass filter, which effectively filters out high-frequency noise and improves measurement accuracy. One end of the power meter is connected to the second end of the first resistor, and the other end is grounded. The current and voltage flowing through the first resistor can be accurately measured, and the actual power of the input DC fan can be calculated in real time. Through real-time monitoring and adjustment, the calibration module can ensure that the DC fan always operates in the best working state and optimize the heat dissipation effect.

[0034] In a preferred example, the present application can be further configured as follows: the radio frequency coupling module includes:

[0035] A coupler, wherein the first end and the second end of the coupler are respectively connected to the rectifier module, and the third end of the coupler is grounded.

[0036] By adopting the above technical solution, the first end and the second end of the coupler are respectively connected to the rectifier module, forming an ideal RF energy conversion channel, which can efficiently couple the RF signal to the rectifier module and realize the precise conversion of RF energy to DC energy. At the same time, the use of the coupler can also effectively isolate the RF power amplifier module and the load module, prevent the load fluctuation from affecting the RF source, and improve the stability and reliability of the entire circuit.

[0037] In summary, the present invention includes at least one of the following beneficial technical effects:

[0038] By adopting the above technical solution, the rectifier module rectifies the first drive voltage to generate a second drive voltage. Subsequently, the filter module filters the second drive voltage to obtain a stable third drive voltage. The DC fan starts and adjusts the air volume according to the third drive voltage to dissipate heat for the load module. As a result, the operation of the DC fan is directly related to the output power of the RF power amplifier module. When the RF power amplifier module outputs a higher power, the first drive voltage obtained by coupling is larger, and the DC fan is finally driven to run at full power, providing a strong heat dissipation effect. Conversely, when the power amplifier unit outputs a lower power, the coupling voltage is smaller, and the DC fan also reduces the power operation, so that the air volume output by the DC fan can be automatically adjusted according to actual needs. Compared with the method of using independent power supply for heat dissipation in the related art, the present application uses radio frequency coupling technology to ensure the stable operation and effective heat dissipation of the load module, while achieving a significant reduction in fan energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a novel short-wave intelligent dummy load circuit provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of another novel short-wave intelligent dummy load circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with the accompanying drawings.

[0042] Reference Figure 1 , is a structural diagram of a novel short-wave intelligent dummy load circuit provided in an embodiment of the present application, the circuit comprising: an RF power amplifier module, an RF coupling module, a rectifier module, a filter module, a DC fan and a load module, the RF coupling module is respectively connected to the RF power amplifier module, the load module and the rectifier module, the rectifier module is connected to the DC fan via the filter module, wherein:

[0043] The RF power amplifier module is used to amplify the RF input signal into a RF output signal, so that the load module operates according to the RF output signal;

[0044] The radio frequency coupling module is used to obtain a first driving voltage according to the radio frequency output signal coupling;

[0045] The rectifier module is used to rectify the first driving voltage into a second driving voltage;

[0046] The filtering module is used to filter the second driving voltage to obtain a third driving voltage;

[0047] The DC fan is used to dissipate heat for the load module according to the third driving voltage.

[0048] The implementation principle of this embodiment is as follows: the RF power amplifier module is responsible for receiving the RF input signal, amplifying it, and generating an RF output signal. The RF output signal not only drives the load module to operate, but also provides a basis for subsequent energy coupling and voltage conversion.

[0049] The radio frequency coupling module is connected between the radio frequency power amplifier module and the load module, and couples a part of the power from the radio frequency signal output by the radio frequency power amplifier module and converts it into a first driving voltage.

[0050] The rectifier module receives the first driving voltage output by the radio frequency coupling module, and rectifies it into a more stable direct current voltage, namely, a second driving voltage.

[0051] The filter module further processes the rectified second drive voltage, filters out the remaining high-frequency ripples and noise, and generates a smooth third drive voltage. This filtered voltage is more stable, ensuring that the DC fan can run smoothly.

[0052] The DC fan is connected to the filter module, receives the third driving voltage and starts to operate. Since the magnitude of the third driving voltage is proportional to the power output by the RF power amplifier module, the speed and air volume of the DC fan are also adjusted accordingly.

[0053] The load module operates according to the RF output signal of the RF power amplifier module, absorbs RF power and generates heat.

[0054] The DC fan dissipates heat from the load module by adjusting the air volume to ensure that its temperature is maintained within a safe range.

[0055] The new short-wave intelligent dummy load circuit realizes intelligent heat dissipation control through the organic combination of RF power amplifier module, RF coupling module, rectifier module, filter module, DC fan and load module. RF coupling technology makes the DC fan without external power supply, adaptively adjusts the air volume, and effectively reduces the fan energy consumption.

[0056] See also Figure 2 , is a schematic diagram of the structure of another novel short-wave intelligent dummy load circuit provided in an embodiment of the present application.

[0057] In the figure, the power source represents the RF power amplifier module, the load resistor represents the load module, and the coupler represents the RF coupling module.

[0058] Specifically, the rectifier module includes a first rectifier diode and a second rectifier diode, wherein:

[0059] The anode of the first rectifier diode and the anode of the second rectifier diode are respectively connected to two ends of the radio frequency coupling module;

[0060] The cathode of the first rectifier diode and the cathode of the second rectifier diode are respectively connected to the filter module.

[0061] In this embodiment, the rectifier module adopts a design of two rectifier diodes, specifically including a first rectifier diode and a second rectifier diode. The positive poles of the two rectifier diodes are respectively connected to the two ends of the RF coupling module, and their negative poles are connected to the filter module. This configuration forms a full-wave rectifier circuit, which can effectively convert the AC signal output by the RF coupling module into a DC signal. The reason for adopting full-wave rectification is that it can make full use of the positive and negative half cycles of the RF signal, improve the rectification efficiency, and make the output DC voltage more stable. In specific implementation, the AC signals output from both ends of the RF coupling module pass through the first rectifier diode and the second rectifier diode respectively. In the positive half cycle, one diode is turned on and the other is turned off; in the negative half cycle, the opposite is true. In this way, whether it is the positive half cycle or the negative half cycle, current passes through, thereby realizing full-wave rectification. The rectified pulsating DC signal is output from the negative poles of the two diodes and enters the filter module for further processing.

[0062] Since the two rectifier diodes in the rectifier module are directly connected to the RF coupling module, the following settings are made to protect the rectifier diodes:

[0063] The rectifier module further includes a second resistor, wherein:

[0064] The anode of the first rectifier diode is connected to the anode of the second rectifier diode via the second resistor.

[0065] By adding a second resistor between the positive electrodes of the two diodes, the current can be balanced to ensure that the two diodes bear similar current loads, thereby extending the service life of the rectifier circuit. Secondly, the second resistor also plays a role in current limiting protection. When the RF signal power suddenly increases, the second resistor can limit the peak current passing through the rectifier diode to prevent the diode from being damaged by instantaneous high current.

[0066] After the first driving voltage is obtained through the rectifier circuit, the first driving voltage has ripple components and poor voltage quality, and cannot directly drive the DC fan to operate. Therefore, the first driving voltage needs to be filtered, which can be implemented using a filtering module.

[0067] The filtering module includes a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a choke coil, wherein:

[0068] The first end of the choke coil is connected to the cathode of the first rectifier diode and the cathode of the second rectifier diode respectively, the cathode of the first rectifier diode is grounded via the fourth capacitor, and the cathode of the second rectifier diode is grounded via the fifth capacitor;

[0069] The second end of the choke is connected to the DC fan, and the second end of the choke is connected to the ground in parallel via the third capacitor and the second capacitor respectively.

[0070] In this embodiment, the design of the filter module adopts a multi-stage filter structure, including a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a choke. The filter structure is intended to convert the rectified pulsating DC signal into a stable DC voltage to drive the DC fan. The design idea of ​​the filter module is to gradually reduce the ripple and improve the quality of the DC voltage through a multi-stage LC filter network.

[0071] In the specific implementation, the choke plays a key role. The first end of the choke is connected to the cathode of the first rectifier diode and the second rectifier diode at the same time, serving as the input end of the entire filter network. The fourth capacitor and the fifth capacitor are respectively connected between the cathode of the first rectifier diode and the second rectifier diode and the ground to form a primary filter. This design can quickly absorb the high-frequency components after rectification and reduce the burden of subsequent filters. The second end of the choke is connected to the DC fan, and is connected to the ground in parallel through the second capacitor and the third capacitor, forming a second-stage filter. The choke plays the role of a low-pass filter here. It has almost no impedance to the DC component, but has a large impedance to the AC component, which can effectively suppress the remaining AC ripple. The parallel design of the second capacitor and the third capacitor further enhances the filtering effect and can absorb ripple components in different frequency ranges.

[0072] The advantage of the filter module design is that it can effectively handle ripples in different frequency ranges. Low-frequency ripples are mainly handled by the choke, while high-frequency ripples are mainly absorbed by capacitors. It can convert the rectified pulsating DC signal into a stable DC voltage with an extremely low ripple coefficient, providing a stable and reliable power supply for the DC fan.

[0073] Furthermore, in order to further improve the filtering effect, the following configuration is specifically adopted: the third capacitor and the fifth capacitor are electrolytic capacitors.

[0074] Electrolytic capacitors have the characteristics of large capacity, low equivalent series resistance (ESR) and relatively low cost, which make them ideal for handling low-frequency ripple and high-current applications. The use of electrolytic capacitors as the fifth capacitor can effectively absorb most of the low-frequency ripple after rectification and provide a relatively smooth basic voltage for subsequent filtering stages. Similarly, the third capacitor is connected between the second end of the choke and the ground to form the last stage of filtering. At this position, the large capacity characteristics of the electrolytic capacitor can further smooth the voltage and provide a stable DC output.

[0075] In order to ensure the voltage level of the input DC fan, the third driving voltage needs to be adjusted, and the calibration module can be used to make the following adjustments.

[0076] A calibration module is connected to the filter module and the DC fan respectively, and is used to calibrate the third driving voltage input to the DC fan.

[0077] The calibration module includes a first resistor, a first capacitor and a power meter, wherein:

[0078] The first end of the first resistor is connected to the filter module and the DC fan respectively, and the second end of the first resistor is grounded via the first capacitor;

[0079] One end of the power meter is connected to the second end of the first resistor, and the other end of the power meter is grounded.

[0080] In this embodiment, the calibration module is introduced to accurately control and monitor the driving voltage of the input DC fan, which is essential for realizing intelligent heat dissipation control. The calibration module is composed of a first resistor, a first capacitor and a power meter. The design idea is to ensure that the DC fan obtains the optimal driving voltage through precise measurement and adjustment, thereby achieving efficient and controllable heat dissipation effect.

[0081] In specific implementation, the first end of the first resistor is connected to the output of the filter module and the input of the DC fan at the same time. This connection method makes the first resistor a sampling resistor, and the voltage of the input DC fan can be indirectly monitored by measuring the voltage across it. The second end of the first resistor is grounded through the first capacitor. This RC combination constitutes a low-pass filter, which can filter out possible high-frequency noise and ensure the accuracy of the measurement.

[0082] One end of the power meter is connected to the second end of the first resistor, and the other end is grounded. This configuration enables the power meter to accurately measure the current and voltage flowing through the first resistor, thereby calculating the actual power input to the DC fan. The use of a power meter is essential for achieving accurate power control and monitoring, as it can reflect the working status of the system in real time.

[0083] In an optional implementation, the radio frequency coupling module includes:

[0084] A coupler, wherein the first end and the second end of the coupler are respectively connected to the rectifier module, and the third end of the coupler is grounded.

[0085] In this embodiment, the core component of the RF coupling module is the coupler. This design reflects the unique idea of ​​the present invention in RF energy conversion. As a key component of the RF coupling module, the main function of the coupler is to achieve efficient collection and transmission of RF signals while ensuring impedance matching and signal integrity of the entire system.

[0086] In specific implementation, the first and second ends of the coupler are connected to the rectifier module respectively. This connection method enables the coupler to effectively couple the RF signal to the rectifier module to achieve the conversion of RF energy to DC energy. The third end of the coupler is grounded. This design not only provides a stable reference potential, but also helps to reduce RF interference and improve the electromagnetic compatibility of the system.

[0087] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A new short-wave intelligent dummy load circuit, characterized in that: The circuit includes: a radio frequency power amplifier module, a radio frequency coupling module, a rectifier module, a filter module, a DC fan and a load module, wherein the radio frequency coupling module is connected to the radio frequency power amplifier module, the load module and the rectifier module respectively, and the rectifier module is connected to the DC fan via the filter module, wherein: The RF power amplifier module is used to amplify the RF input signal into a RF output signal, so that the load module operates according to the RF output signal; The radio frequency coupling module is used to obtain a first driving voltage according to the radio frequency output signal coupling; The rectifier module is used to rectify the first driving voltage into a second driving voltage; The filtering module is used to filter the second driving voltage to obtain a third driving voltage; The DC fan is used to dissipate heat for the load module according to the third driving voltage.

2. The novel short-wave intelligent dummy load circuit according to claim 1 is characterized in that: The rectifier module includes a first rectifier diode and a second rectifier diode, wherein: The anode of the first rectifier diode and the anode of the second rectifier diode are respectively connected to two ends of the radio frequency coupling module; The cathode of the first rectifier diode and the cathode of the second rectifier diode are respectively connected to the filter module.

3. The novel short-wave intelligent dummy load circuit according to claim 2 is characterized in that: The filtering module includes a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a choke coil, wherein: The first end of the choke coil is connected to the cathode of the first rectifier diode and the cathode of the second rectifier diode respectively, the cathode of the first rectifier diode is grounded via the fourth capacitor, and the cathode of the second rectifier diode is grounded via the fifth capacitor; The second end of the choke is connected to the DC fan, and the second end of the choke is connected to the ground in parallel via the third capacitor and the second capacitor respectively.

4. The novel short-wave intelligent dummy load circuit according to claim 3 is characterized in that: The third capacitor and the fifth capacitor are electrolytic capacitors.

5. The novel short-wave intelligent dummy load circuit according to claim 2 is characterized in that: The rectifier module further includes a second resistor, wherein: The anode of the first rectifier diode is connected to the anode of the second rectifier diode via the second resistor.

6. The novel short-wave intelligent dummy load circuit according to claim 1 is characterized in that: The circuit further comprises: A calibration module is connected to the filter module and the DC fan respectively, and is used to calibrate the third driving voltage input to the DC fan.

7. The novel short-wave intelligent dummy load circuit according to claim 6 is characterized in that: The calibration module includes a first resistor, a first capacitor and a power meter, wherein: The first end of the first resistor is connected to the filter module and the DC fan respectively, and the second end of the first resistor is grounded via the first capacitor; One end of the power meter is connected to the second end of the first resistor, and the other end of the power meter is grounded.

8. The novel short-wave intelligent dummy load circuit according to claim 1 is characterized in that: The radio frequency coupling module comprises: A coupler, wherein the first end and the second end of the coupler are respectively connected to the rectifier module, and the third end of the coupler is grounded.

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