Power divider with filtering function and power supply

Abstract

The embodiment of the utility model provides a power divider with a filtering function and a power supply. The power divider comprises a first power branch circuit, a second power branch circuit, a first series resonance circuit and a second series resonance circuit, the first power branch circuit is connected with the first series resonance circuit, the second power branch circuit is connected with the second series resonance circuit, and second harmonics of the first power branch circuit are suppressed through the first series resonance circuit. The second series resonance circuit suppresses the second harmonic of the second power branch, so that the power divider has a filtering function, and is simple in structure and very small in insertion loss.

Description

Technical Field

[0001] The present application relates to the field of radio frequency circuit technology, and in particular to a power divider and a power supply with filtering functions. Background Art

[0002] Since the operating frequency of the RF power supply is relatively low, a Wilkinson power divider composed of lumped parameters is generally used to divide the energy of one input signal into multiple outputs, or to combine the energy of multiple signals into one output. Figure 1 As shown in FIG. 1 , a two-way Wilkinson power divider composed of lumped parameters is used to divide one input signal into two output signals. However, the current Wilkinson power divider has no filtering function, and its working stability and accuracy are poor. Utility Model Content

[0003] The embodiments of the present application provide a power divider and a power supply with a filtering function to solve the problems existing in the prior art.

[0004] According to a first aspect of an embodiment of the present application, there is provided a power divider with a filtering function, comprising a first power branch, a second power branch, a first series resonant circuit, and a second series resonant circuit, wherein the first power branch is connected to the first series resonant circuit, and the second power branch is connected to the second series resonant circuit;

[0005] The first series resonant circuit is used to suppress the second harmonic of the first power branch;

[0006] The second series resonant circuit is used to suppress the second harmonic of the second power branch.

[0007] Furthermore, the first power branch includes a first inductor and a first capacitor, one end of the first inductor is connected to the input end and the first series resonant circuit respectively, the other end of the first inductor is connected to one end of the first capacitor and the first output end respectively, and the other end of the first capacitor is grounded.

[0008] Furthermore, the second power branch includes a second inductor and a second capacitor, one end of the second inductor is connected to the input end and the second series resonant circuit respectively, the other end of the second inductor is connected to one end of the second capacitor and the second output end respectively, and the other end of the second capacitor is grounded.

[0009] Furthermore, the first series resonant circuit includes a third inductor and a third capacitor, one end of the third inductor is connected to one end of the first inductor, the other end of the third inductor is connected to the third capacitor, and the other end of the third capacitor is grounded.

[0010] Furthermore, the second series resonant circuit includes a fourth inductor and a fourth capacitor, one end of the fourth inductor is connected to one end of the second inductor, the other end of the fourth inductor is connected to the fourth capacitor, and the other end of the fourth capacitor is grounded.

[0011] Further, the power divider also includes a fifth inductor, one end of the fifth inductor is connected to the other end of the second inductor, and the other end of the fifth inductor is connected to one end of the second capacitor;

[0012] The fifth inductor and the second capacitor form a third series resonant circuit, and the third series resonant circuit is used to suppress the third harmonic of the second power branch.

[0013] Further, the power divider also includes a sixth inductor, one end of the sixth inductor is connected to the other end of the first inductor, and the other end of the sixth inductor is connected to one end of the first capacitor;

[0014] The sixth inductor and the first capacitor form a fourth series resonant circuit, and the fourth series resonant circuit is used to suppress the third harmonic of the first power branch.

[0015] Furthermore, the power divider also includes a resistor, which is connected between the first power branch and the second power branch.

[0016] Furthermore, the power divider also includes a first impedance, a second impedance and a third impedance, one end of the first impedance is connected to the input end, one end of the second impedance is connected to the first output end, one end of the third impedance is connected to the second output end, and the other end of the first impedance, the other end of the second impedance and the other end of the third impedance are all grounded.

[0017] According to a second aspect of an embodiment of the present application, a power supply is provided, comprising the power divider with filtering function as described in any one of the above embodiments.

[0018] A power divider and a power supply with a filtering function provided in an embodiment of the present application are used. The power divider includes a first power branch, a second power branch, a first series resonant circuit, and a second series resonant circuit. The first power branch is connected to the first series resonant circuit, and the second power branch is connected to the second series resonant circuit. The second harmonic of the first power branch is suppressed by the first series resonant circuit, and the second harmonic of the second power branch is suppressed by the second series resonant circuit, so that the power divider has a filtering function, and has a simple structure and very small insertion loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A Wilkinson power divider composed of lumped parameters in the prior art;

[0021] Figure 2A circuit diagram of a power divider with filtering function provided in an embodiment of the present application;

[0022] Figure 3 A simulation schematic diagram of a power divider with filtering function provided in an embodiment of the present application;

[0023] Figure 4 A circuit diagram of another power divider with filtering function provided in an embodiment of the present application;

[0024] Figure 5 A circuit diagram of another power divider with filtering function provided in an embodiment of the present application.

[0025] Figure Number:

[0026] 1-power divider; 10-first power branch; 20-second power branch; 30-first series resonant circuit; 40-second series resonant circuit; L1-first inductor; L2-second inductor; L3-third inductor; L4-fourth inductor; L5-fifth inductor; L6-sixth inductor; C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor; R1-resistor; Z1-first impedance; Z2-second impedance; Z3-third impedance. DETAILED DESCRIPTION

[0027] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] In the process of implementing the present application, the inventors found that the current Wilkinson power divider has no filtering function and has poor working stability and accuracy.

[0029] In view of the above problems, the present application provides a power divider 1 with a filtering function, such as Figure 2 As shown, the power divider 1 includes a first power branch 10, a second power branch 20, a first series resonant circuit 30 and a second series resonant circuit 40. The first power branch 10 is connected to the first series resonant circuit 30, and the second power branch 20 is connected to the second series resonant circuit 40.

[0030] The first series resonant circuit 30 is used to suppress the second harmonic of the first power branch 10 ; the second series resonant circuit 40 is used to suppress the second harmonic of the second power branch 20 .

[0031] It can be understood that the present application improves the existing two-way Wilkinson power divider 1 composed of lumped parameters to obtain a power divider 1 with filtering function. Specifically, the second harmonic of the first power branch 10 is suppressed by the first series resonant circuit 30, and the second harmonic of the second power branch 20 is suppressed by the second series resonant circuit 40, so that the power divider 1 has a filtering function, and has a simple structure and very small insertion loss.

[0032] like Figure 2 As shown, the first power branch 10 includes a first inductor L1 and a first capacitor C1, one end of the first inductor L1 is connected to the input end and the first series resonant circuit 30 respectively, the other end of the first inductor L1 is connected to one end of the first capacitor C1 and the first output end respectively, and the other end of the first capacitor C1 is grounded.

[0033] The second power branch 20 includes a second inductor L2 and a second capacitor C2, one end of the second inductor L2 is connected to the input end and the second series resonant circuit 40 respectively, the other end of the second inductor L2 is connected to one end of the second capacitor C2 and the second output end respectively, and the other end of the second capacitor C2 is grounded.

[0034] The first series resonant circuit 30 includes a third inductor L3 and a third capacitor C3. One end of the third inductor L3 is connected to one end of the first inductor L1. The other end of the third inductor L3 is connected to the third capacitor C3. The other end of the third capacitor C3 is grounded.

[0035] The second series resonant circuit 40 includes a fourth inductor L4 and a fourth capacitor C4. One end of the fourth inductor L4 is connected to one end of the second inductor L2. The other end of the fourth inductor L4 is connected to the fourth capacitor C4. The other end of the fourth capacitor C4 is grounded.

[0036] Among them, the first inductor L1, the first capacitor C1 and the third capacitor C3 form a low-pass filter, the third inductor L3 and the third capacitor C3 form a series resonance, and the resonance frequency is the frequency of the second harmonic, so the signal attenuation is the largest at this frequency point, which has a good inhibitory effect on the second harmonic. Similarly, the second inductor L2, the second capacitor C2 and the fourth capacitor C4 also form a low-pass filter, the fourth inductor L4 and the fourth capacitor C4 form a series resonance, and the resonance frequency is also the frequency of the second harmonic, so the signal attenuation is the largest at this frequency point, which has a good inhibitory effect on the second harmonic. The simulation results of the series resonance circuit for the power branch are shown as follows: Figure 3 As shown in the figure, from the simulation results, it can be seen that the second harmonic can be well suppressed, the structure is simple and the insertion loss is very small.

[0037] As an embodiment, the values ​​of the first inductor L1 and the second inductor L2 of the present application can be 590nH, the values ​​of the first capacitor C1 and the second capacitor C2 can be 220pF, the values ​​of the third inductor L3 and the fourth inductor L4 can be 230nH, and the values ​​of the third capacitor C4 and the fourth capacitor C4 can be 150pF. Since the values ​​of the first inductor L1, the second inductor L2, the third inductor L3, the fourth inductor L4, the first capacitor C1 and the second capacitor C2 can be changed, the resonant frequency can be changed, so those skilled in the art can adjust the values ​​of the inductor and the capacitor according to the actual situation to suppress harmonics of different frequencies, which is not limited here.

[0038] Please continue to refer to Figure 2 The power divider 1 of the present application further includes a resistor R1 , which is connected between the first power branch 10 and the second power branch 20 .

[0039] Specifically, one end of the resistor R1 is connected to the other end of the first inductor L1 , and the other end of the resistor R1 is connected to the other end of the second inductor L2 .

[0040] It should be understood that the resistor R1 can increase the isolation.

[0041] Please continue to refer to Figure 2 The power divider 1 of the present application also includes a first impedance Z1, a second impedance Z2 and a third impedance Z3, one end of the first impedance Z1 is connected to the input end, one end of the second impedance Z2 is connected to the first output end, one end of the third impedance Z3 is connected to the second output end, and the other end of the first impedance Z1, the other end of the second impedance Z2 and the other end of the third impedance Z3 are all grounded.

[0042] It should be understood that the first impedance Z1 , the second impedance Z2 , and the third impedance Z3 are impedances of the test cable.

[0043] In order to make the power divider 1 have the function of suppressing the third harmonic, Figure 2 A fifth inductor L5 and a sixth inductor L6 are added to the power divider 1 shown in FIG. Figure 4 As shown, one end of the fifth inductor L5 is connected to the other end of the second inductor L2, and the other end of the fifth inductor L5 is connected to one end of the second capacitor C2; one end of the sixth inductor L6 is connected to the other end of the first inductor L1, and the other end of the sixth inductor L6 is connected to one end of the first capacitor C1.

[0044] It should be understood that the fifth inductor L5 and the second capacitor C2 constitute a third series resonant circuit, which is used to suppress the third harmonic of the second power branch 20; the sixth inductor L6 and the first capacitor C1 constitute a fourth series resonant circuit, which is used to suppress the third harmonic of the first power branch 10.

[0045] Since the fifth inductor L5 and the second capacitor C2 form a third series resonant circuit, a resonance point is added on the basis of the low-pass filter formed by the second capacitor C2, and this resonance point is exactly the third harmonic frequency, so the maximum attenuation is generated at this frequency point, thus achieving the third harmonic suppression function. Similarly, since the sixth inductor L6 and the first capacitor C1 form a fourth series resonant circuit, a resonance point is added on the basis of the low-pass filter formed by the first capacitor C1, and this resonance point is also exactly the third harmonic frequency, so the maximum attenuation is generated at this frequency point, thus achieving the third harmonic suppression function.

[0046] like Figure 5 As shown in Figure 2 The simulation schematic diagram is shown after the fifth inductor L5 and the sixth inductor L6 are added to the power divider 1. From the simulation results, it can be seen that the third harmonic is well suppressed, the structure is simple, and the insertion loss is very small.

[0047] In the embodiment of the present application, the fifth inductor L5 and the sixth inductor L6 may be set to 86 nH. Since the resonant frequency can be changed by changing the value of the inductor, those skilled in the art may adjust the values ​​of the fifth inductor L5 and the sixth inductor L6 according to actual conditions to suppress harmonics of different frequencies, which is not limited here.

[0048] The present application also provides a power supply, comprising the power divider 1 with filtering function described in any of the above embodiments; the power supply may be a radio frequency power supply.

[0049] In summary, the present application provides a power divider 1 and a power supply with a filtering function. The power divider 1 includes a first power branch 10, a second power branch 20, a first series resonant circuit 30 and a second series resonant circuit 40. The first power branch 10 is connected to the first series resonant circuit 30, and the second power branch 20 is connected to the second series resonant circuit 40. The second harmonic of the first power branch 10 is suppressed by the first series resonant circuit 30, and the second harmonic of the second power branch 20 is suppressed by the second series resonant circuit 40, so that the power divider 1 has a filtering function, and the structure is simple and the insertion loss is very small.

[0050] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents.

Claims

1. A power divider with filtering function, characterized in that: It includes a first power branch, a second power branch, a first series resonant circuit and a second series resonant circuit, wherein the first power branch is connected to the first series resonant circuit, and the second power branch is connected to the second series resonant circuit; The first series resonant circuit is used to suppress the second harmonic of the first power branch; The second series resonant circuit is used to suppress the second harmonic of the second power branch.

2. The power divider with filtering function according to claim 1, characterized in that: The first power branch includes a first inductor and a first capacitor, one end of the first inductor is connected to the input end and the first series resonant circuit respectively, the other end of the first inductor is connected to one end of the first capacitor and the first output end respectively, and the other end of the first capacitor is grounded.

3. The power divider with filtering function according to claim 1, characterized in that: The second power branch includes a second inductor and a second capacitor, one end of the second inductor is connected to the input end and the second series resonant circuit respectively, the other end of the second inductor is connected to one end of the second capacitor and the second output end respectively, and the other end of the second capacitor is grounded.

4. The power divider with filtering function according to claim 2, characterized in that: The first series resonant circuit includes a third inductor and a third capacitor, one end of the third inductor is connected to one end of the first inductor, the other end of the third inductor is connected to the third capacitor, and the other end of the third capacitor is grounded.

5. The power divider with filtering function according to claim 3, characterized in that: The second series resonant circuit includes a fourth inductor and a fourth capacitor, one end of the fourth inductor is connected to one end of the second inductor, the other end of the fourth inductor is connected to the fourth capacitor, and the other end of the fourth capacitor is grounded.

6. The power divider with filtering function according to claim 3, characterized in that: The power divider further includes a fifth inductor, one end of the fifth inductor is connected to the other end of the second inductor, and the other end of the fifth inductor is connected to one end of the second capacitor; The fifth inductor and the second capacitor form a third series resonant circuit, and the third series resonant circuit is used to suppress the third harmonic of the second power branch.

7. The power divider with filtering function according to claim 2, characterized in that: The power divider further includes a sixth inductor, one end of the sixth inductor is connected to the other end of the first inductor, and the other end of the sixth inductor is connected to one end of the first capacitor; The sixth inductor and the first capacitor form a fourth series resonant circuit, and the fourth series resonant circuit is used to suppress the third harmonic of the first power branch.

8. The power divider with filtering function according to claim 1, characterized in that: The power divider further includes a resistor connected between the first power branch and the second power branch.

9. The power divider with filtering function according to claim 1, characterized in that: The power divider also includes a first impedance, a second impedance and a third impedance, one end of the first impedance is connected to the input end, one end of the second impedance is connected to the first output end, one end of the third impedance is connected to the second output end, and the other ends of the first impedance, the second impedance and the third impedance are all grounded.

10. A power supply, characterized in that: It comprises a power divider with filtering function as described in any one of claims 1 to 9.

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