公开(公告)号：US20190182910A1

公开(公告)日：2019-06-13

申请号：US16273147

申请日：2019-02-12

Applicant: Sichuan University

Inventor： Kama Huang ,  Huacheng Zhu ,  Yang Yang ,  Xing Chen ,  Changjun Liu

IPC: H05B6/64 ,  H05B6/68 ,  H05B6/70 ,  H05B6/72

Abstract: A microwave oven based on phased arrays includes a heating chamber; a microwave feed source, wherein the microwave feed source includes multiple array antennas which are evenly distributed at a top portion of the heating chamber; mass sensors which are adapted for at least dividing a bottom portion of the heating chamber into two parts; a phase control module for connecting the mass sensors and the array antennas, wherein the mass sensors are adapted for transmitting quality signals of an object to be heated to the phase control module. The quality signals of the object of the mass sensors are transmitted back to the phase control module, in which the microwave is radiated more to the food with high quality, that is, the space controllable heating is achieved, so as to improve energy efficiency and heating uniformity.

公开(公告)号：US20230187164A1

公开(公告)日：2023-06-15

申请号：US18079969

申请日：2022-12-13

Applicant: Sichuan University

Inventor： Changjun Liu ,  Shaoyue Wang ,  Liping Yan

IPC: H01J25/50 ,  H01J23/38

CPC classification number: H01J25/50 ,  H01J23/38

Abstract: An injection locked magnetron system based on filament injection is provided, which includes a magnetron, an excitation cavity, and a load. The magnetron is installed on the excitation cavity and connected to the excitation cavity, the excitation cavity is detachably connected to the load, the magnetron is provided with an injection antenna, and the injection antenna is used to receive an injected external signal and couple the injected external signal into the magnetron for realizing injection locking. The injected external signal is injected by a monopole antenna, and coupled into the magnetron resonant cavity through a magnetron filament, and the output microwave of the magnetron is output through the excitation cavity, and passes through the waveguide directional coupler, and is finally absorbed by the load, such that the output microwave of the magnetron can be locked by the injected external signal.

公开(公告)号：US20220136098A1

公开(公告)日：2022-05-05

申请号：US17576794

申请日：2022-01-14

Applicant: Sichuan University

Inventor： Kama Huang ,  Yang Yang ,  Changjun Liu ,  Huacheng Zhu

IPC: C23C14/35 ,  H01J37/34 ,  H01J37/32

Abstract: A method for improving service life of a magnetron, which belongs to the technical field of microwave applications, includes: taking anode working voltage range is taken as n voltage values U1 . . . Un constituting an arithmetic sequence; taking the voltage value as the anode voltage; in each voltage value, adjusting the magnet coil current between I min and Imax by the coil current control part , so that the output power P of the experimental magnetron is equal to the target power P0, and measuring the cathode filament temperature at this time by the temperature measuring part, which is denoted as Ti; measuring all the cathode filament temperatures Ti as the temperature data set corresponding to P0 by the temperature measuring part; taking out the minimum temperature value Tmin in the temperature data set, and using the anode voltage value and the magnet coil current value corresponding to Tmin as the working magnetron, wherein the output power is the anode voltage value and the magnet coil current value of P0. The present invention provides a method for improving the service life of a magnetron, which adjusts the electric field and the magnetic field, finds the synergy between the magnetic field and the electric field, and improves the service life of the magnetron.

公开(公告)号：US20150270091A1

公开(公告)日：2015-09-24

申请号：US14729300

申请日：2015-06-03

Applicant: Sichuan University

Inventor： Kama Huang ,  Changjun Liu ,  Yang Yang ,  Xing Chen ,  Huacheng Zhu

IPC: H01J25/50

CPC classification number: H01J25/50

Abstract: An injection locked magnetron microwave generator with a recycle of spurious energy, relating to a microwave power source, includes a frequency selective reflector for recycling the spurious energy of a magnetron and satisfies locking requirements of an output frequency of a high-output-power magnetron with a low-power injection signal. The microwave generator includes n magnetrons and n locking devices. The locking devices inject locking signals into the corresponding magnetrons. The n locking devices are connected with a microwave source. Output terminals of the magnetrons are connected with corresponding frequency selective reflectors for reflecting the spurious microwave signals outputted by the magnetrons back to the magnetrons. N≧1. The microwave generator, with a simple structure, effectively recycles the spurious energy outputted by the magnetrons, and reduces the power of the injection signal and costs of the microwave source and the overall microwave generator.

Abstract translation: 具有与微波功率源相关的杂散能量再循环的注入锁定磁控管微波发生器包括用于再现磁控管的杂散能量的频率选择性反射器，并且满足高输出功率磁控管的输出频率的锁定要求 低功率注入信号。 微波发生器包括n个磁控管和n个锁定装置。 锁定装置将锁定信号注入到相应的磁控管中。 n个锁定装置与微波源连接。 磁控管的输出端子与相应的频率选择反射器连接，用于将由磁控管输出的杂散微波信号反射回磁控管。 N≥1。 具有简单结构的微波发生器有效地回收了磁控管输出的杂散能量，并降低了注入信号的功率和微波源和整个微波发生器的成本。

公开(公告)号：US11150286B2

公开(公告)日：2021-10-19

申请号：US16699607

申请日：2019-11-30

Applicant: Sichuan University

Inventor： Kama Huang ,  Yang Yang ,  Huacheng Zhu ,  Xing Chen ,  Changjun Liu

IPC: G01R29/08

Abstract: A wireless passive probe solves problems such as the measurement accuracy of the field strength detecting device in the prior art is affected by the communication device and the system structure is complicated, which includes a probe for collecting data in the field to be measured; wherein the wireless passive probe further comprises: a wireless transmission module, an antenna module, sensors, and a microprocessor. The wireless passive probe of the present invention transmits position temperature, field strength, moisture, air pressure probe serial numbers and the coordinate signals of the probe in real time through the wireless transmission module, and provides the power supply to the communication module through detecting or receiving microwave signals through the antenna, thereby avoiding inaccurate wireless measurement of the probe field caused by the field to be tested which is not tightly sealed and the cable.

公开(公告)号：US09355808B2

公开(公告)日：2016-05-31

申请号：US14729300

申请日：2015-06-03

Applicant: Sichuan University

Inventor： Kama Huang ,  Changjun Liu ,  Yang Yang ,  Xing Chen ,  Huacheng Zhu

IPC: H01J25/50

CPC classification number: H01J25/50

Abstract: An injection locked magnetron microwave generator with a recycle of spurious energy, relating to a microwave power source, includes a frequency selective reflector for recycling the spurious energy of a magnetron and satisfies locking requirements of an output frequency of a high-output-power magnetron with a low-power injection signal. The microwave generator includes n magnetrons and n locking devices, n≧1. The locking devices inject locking signals into the corresponding magnetrons. The n locking devices are connected with a microwave source. Output terminals of the magnetrons are connected with corresponding frequency selective reflectors for reflecting the spurious microwave signals outputted by the magnetrons back to the magnetrons. The microwave generator, with a simple structure, effectively recycles the spurious energy outputted by the magnetrons, and reduces the power of the injection signal and costs of the microwave source and the overall microwave generator.

Abstract translation: 具有与微波功率源相关的杂散能量再循环的注入锁定磁控管微波发生器包括用于再现磁控管的杂散能量的频率选择性反射器，并且满足高输出功率磁控管的输出频率的锁定要求 低功率注入信号。 微波发生器包括n个磁控管和n个锁定装置，n≥1。 锁定装置将锁定信号注入到相应的磁控管中。 n个锁定装置与微波源连接。 磁控管的输出端子与相应的频率选择反射器连接，用于将由磁控管输出的杂散微波信号反射回磁控管。 具有简单结构的微波发生器有效地回收了磁控管输出的杂散能量，并降低了注入信号的功率和微波源和整个微波发生器的成本。

公开(公告)号：US11054454B2

公开(公告)日：2021-07-06

申请号：US16699614

申请日：2019-11-30

Applicant: Sichuan University

Inventor： Yang Yang ,  Kama Huang ,  Huacheng Zhu ,  Xing Chen ,  Changjun Liu

IPC: G01R29/08

Abstract: A wireless passive field strength probe includes monopole antennas; a detection module; a micro processing device; a wireless transmission module and an antenna module, wherein the wireless transmission module is connected to the micro processing device and the antenna module; a frequency of the antenna module is different from a frequency of the field to be measured, and is not a harmonic of the frequency of the field to be measured; and a power module connected to the detection module or the antenna module. The wireless passive field strength probe of the present invention transmits the vector electric field, the probe serial numbers and the coordinate signals of the probe in real time through the wireless transmission module, and provides the power supply to the communication module through detecting or receiving microwave signals through the antenna, thereby avoiding inaccurate wireless measurement.

公开(公告)号：US10470257B2

公开(公告)日：2019-11-05

申请号：US15352604

申请日：2016-11-16

Applicant: Sichuan University

Inventor： Kama Huang ,  Huacheng Zhu ,  Yang Yang ,  Changjun Liu ,  Xing Chen

IPC: H05B6/70 ,  H05B6/68 ,  H05B6/64

Abstract: The present invention relates to a technical field of microwave heating, and more particularly to a microwave frequency-selective heating device and a method thereof. The microwave frequency-selective heating device includes: a heating chamber with a microwave feed-in device, and a frequency controller; wherein the frequency controller is connected to the microwave feed-in device. According to the microwave frequency-selective heating device and the method of the present invention, the heating frequency is adjusted by setting the microwave adjusting device, which improves a material heating uniformity while greatly increases a material microwave absorption rate, so as to solve a heating efficiency problem of the conventional technologies. According to the present invention, the frequency for the heated material is intelligently selected by the micro-processor of the microwave adjusting device, and then fed in after being adjusted by the frequency control circuit, which is effective and convenient.

公开(公告)号：US11842878B2

公开(公告)日：2023-12-12

申请号：US18079969

申请日：2022-12-13

Applicant: Sichuan University

Inventor： Changjun Liu ,  Shaoyue Wang ,  Liping Yan

IPC: H01J25/50 ,  H01J23/38

CPC classification number: H01J25/50 ,  H01J23/38

Abstract: An injection locked magnetron system based on filament injection is provided, which includes a magnetron, an excitation cavity, and a load. The magnetron is installed on the excitation cavity and connected to the excitation cavity, the excitation cavity is detachably connected to the load, the magnetron is provided with an injection antenna, and the injection antenna is used to receive an injected external signal and couple the injected external signal into the magnetron for realizing injection locking. The injected external signal is injected by a monopole antenna, and coupled into the magnetron resonant cavity through a magnetron filament, and the output microwave of the magnetron is output through the excitation cavity, and passes through the waveguide directional coupler, and is finally absorbed by the load, such that the output microwave of the magnetron can be locked by the injected external signal.

公开(公告)号：US11474201B2

公开(公告)日：2022-10-18

申请号：US16711448

申请日：2019-12-12

Applicant: Sichuan University

Inventor： Yang Yang ,  Kama Huang ,  Xing Chen ,  Changjun Liu ,  Huacheng Zhu

IPC: G01S7/282 ,  H05B6/68 ,  H05B6/66

Abstract: The present invention discloses a method of controlling transmitting frequencies of microwave source, which includes the following steps of: a) collecting reflection frequencies of a load according to a pre-set sampling rate; b) calculating a change rate of the reflection frequencies collected in the step a; c) setting a reflection frequency threshold and a change rate threshold; d) comparing the reflection frequencies and the change rate with the reflection frequency threshold and the change rate threshold respectively; wherein if the reflection frequencies or the change rate is less than the threshold goes to step e or returns to the step a; e) sending control signals to the microwave source and tuning the transmitting frequencies; and f) returning to step a. The present invention also discloses a microwave transmission system thereof. The present invention can be applied in controlling microwave source consists of single magnetron tube or multiple magnetron tubes.