一种高精度射频功率测量装置

Abstract

本实用新型属于医疗设备技术领域，涉及一种高精度射频功率测量装置。该装置包括微带线、检波电路与PCB板；检波电路设置在PCB板上；微带线的一端与射频信号的输入口连接，另一端与理疗探头连接；检波电路包括衰减电路、隔离端吸收负载电路、检波二极管与滤波电路本实用新型利用检波二极管检波实现射频理治疗仪输出功率高精度检测功能，结构简单，实用性强，具有成本低的优点；该装置检测范围宽，适用于多种功率档位的射频理疗仪检测。

Claims

1. A high-precision radio frequency power measuring device, characterized by, It includes a microstrip line, a detection circuit, and a PCB board; the detection circuit is set on the PCB board; one end of the microstrip line is connected to the input port of the radio frequency signal, and the other end is connected to the physiotherapy probe; The detection circuit includes an attenuation circuit, an isolation-end absorption load circuit, a detection diode, and a filter circuit. The output terminal of the microstrip line is electrically connected to the anode of the detection diode and the first terminal of the attenuation circuit. The second terminal of the attenuation circuit is electrically connected to one terminal of the isolation-end absorption load circuit, and the other terminal of the isolation-end absorption load circuit is grounded. The cathode of the detection diode is electrically connected to the output terminal of the detection circuit through the filter circuit.

2. The high-precision radio frequency power measuring device according to claim 1, characterized in that, The filter circuit includes a filter capacitor; one end of the filter capacitor is electrically connected to the cathode of the detector diode, and the other end is grounded.

3. The high precision RF power measurement device of claim 1, wherein, The attenuation circuit includes a first resistor, a second resistor, and a third resistor; the anode of the detector diode is connected to the second terminal of the first resistor and the first terminal of the second resistor; the first terminal of the second resistor and the first terminal of the third resistor are grounded; the second terminal of the second resistor and the second terminal of the third resistor are electrically connected to the input terminal of the isolation terminal absorption load circuit.

4. The high-precision radio frequency power measuring device according to claim 3, characterized in that, The first resistor has a resistance of 200~400Ω; the second resistor has a resistance of 10~30Ω; and the third resistor has a resistance of 200~400Ω.

5. The high-precision radio frequency power measuring device according to claim 3, characterized in that, The first, second, and third resistors are all sliding rheostats.

6. The high precision RF power measurement device of claim 1, wherein, The isolation terminal absorbs the load circuit, which includes a fourth resistor; the second terminal of the attenuation circuit is grounded through the fourth resistor.

7. The high precision RF power measurement device of claim 1, wherein, The resistance of the fourth resistor is 50Ω.

8. The high-precision radio frequency power measurement device according to claim 1, characterized in that, The cathode of the detector diode is also connected to a grounding resistor circuit; the grounding resistor circuit includes a fifth resistor; the input terminal of the grounding resistor circuit is electrically connected to the second terminal of the fifth resistor; the first terminal of the fifth resistor is grounded.

9. The high precision RF power measurement device of claim 1, wherein, The fifth resistor has a resistance of 4.7kΩ.

10. The high precision RF power measurement device of claim 1, wherein, It also includes a housing; the PCB board is fixedly installed in the housing.

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