High-power microwave power supply capable of efficiently dissipating heat
阅读说明：本技术 一种高效散热的大功率微波电源 (High-power microwave power supply capable of efficiently dissipating heat ) 是由 高龙 王炜 印长豹 于 2019-08-29 设计创作，主要内容包括：本发明涉及微波电源,具体涉及一种高效散热的大功率微波电源,包括用于接入输入信号并对输入信号进行整流滤波的第一整流滤波模块,第一整流滤波模块与用于产生交变信号的谐振半桥电路模块相连,谐振半桥电路模块的输出端连接高频变压器的原边绕组,高频变压器的副边绕组与用于进行整流滤波的第二整流滤波模块相连,谐振半桥电路模块与驱动模块相连,谐振半桥电路模块包括第一开关Q1、第二开关Q2,驱动模块驱动第一开关Q1、第二开关Q2导通或关断在高频变压器的原边绕组上产生交变信号；本发明提供的技术方案能够有效克服现有技术所存在的针对高频变压器的散热性能较差的缺陷。(The invention relates to a microwave power supply, in particular to a high-efficiency heat-radiating high-power microwave power supply, which comprises a first rectifying and filtering module, a second rectifying and filtering module and a driving module, wherein the first rectifying and filtering module is used for accessing an input signal and rectifying and filtering the input signal and is connected with a resonant half-bridge circuit module used for generating an alternating signal, the output end of the resonant half-bridge circuit module is connected with a primary winding of a high-frequency transformer, a secondary winding of the high-frequency transformer is connected with the second rectifying and filtering module used for rectifying and filtering, the resonant half-bridge circuit module is connected with the driving module, the resonant half-bridge circuit module comprises a first switch Q1 and a second switch Q2, and the driving module drives the first switch Q1 and the second switch Q2 to be switched on or switched off to generate; the technical scheme provided by the invention can effectively overcome the defect of poor heat dissipation performance of the high-frequency transformer in the prior art.)
1. A high-power microwave power supply capable of efficiently radiating heat is characterized in that: the high-frequency rectification filter circuit comprises a first rectification filter module used for accessing an input signal and rectifying and filtering the input signal, wherein the first rectification filter module is connected with a resonance half-bridge circuit module used for generating an alternating signal, the output end of the resonance half-bridge circuit module is connected with a primary winding of a high-frequency transformer (1), a secondary winding of the high-frequency transformer (1) is connected with a second rectification filter module used for rectifying and filtering, and the resonance half-bridge circuit module is connected with a driving module;
the resonant half-bridge circuit module comprises a first switch Q1 and a second switch Q2, and the driving module drives the first switch Q1 and the second switch Q2 to be switched on or off to generate alternating signals on a primary winding of the high-frequency transformer (1);
high frequency transformer (1) outside is equipped with heat conduction casing (2), heat conduction casing (2) inside is fixed with baffle (3), high frequency transformer (1) through heat conduction silica gel layer (4) with heat conduction casing (2) inner wall, baffle (3) are fixed, baffle (3) with be fixed with water tank (5) between heat conduction casing (2) inner wall, water tank (5) below is equipped with water pump (6), water tank (5) top intercommunication has spiral radiating tube (7), heat conduction casing (2) top with cooling fan (8) are installed to spiral radiating tube (7) relative department, water pump (6) play water end with run through outlet pipe (9) intercommunication of baffle (3), spiral radiating tube (7) tip with run through inlet tube (11) intercommunication of baffle (3), outlet pipe (9) with it has the tortuous to run through to communicate between inlet tube (11) heat pipe (4) (10) And the water inlet end of the water pump (6) is communicated with the water tank (5) through a connecting pipe.
2. The high-power microwave power supply with high-efficiency heat dissipation according to claim 1, characterized in that: the first rectifying and filtering module and the second rectifying and filtering module both comprise a bridge rectifier circuit and a capacitor filter circuit.
3. The high-power microwave power supply with high-efficiency heat dissipation according to claim 1, characterized in that: the driving signal output by the driving module is a PWM signal.
4. The high-power microwave power supply with high-efficiency heat dissipation according to claim 1, characterized in that: the part of the heat conduction pipe (10) located inside the heat conduction silica gel layer (4) is zigzag and penetrates through the heat conduction silica gel layer (4).
5. The high-power microwave power supply with high-efficiency heat dissipation according to claim 1, characterized in that: the side wall of the heat conduction shell (2) is provided with heat dissipation holes opposite to the spiral heat dissipation pipe (7).
6. The high-power microwave power supply with high-efficiency heat dissipation according to claim 1, characterized in that: and a dust filtering net is fixedly arranged on the air inlet side of the heat radiation fan (8).
Technical Field
The invention relates to a microwave power supply, in particular to a high-power microwave power supply capable of efficiently dissipating heat.
Background
The microwave is an electromagnetic wave with the frequency of 300 MHz-3000 GHz and the wavelength of 0.1 mm-1 m, has the characteristics of high penetrability, small thermal inertia, uniform heating, high thermal efficiency and the like, and is widely applied to the fields of microwave heating and the like. The complete microwave system mainly comprises a microwave power supply, a magnetron, a waveguide element, a sensor, a controller, a load and the like; the microwave power supply and the magnetron are the core of the microwave system, and the performance of the microwave power supply and the performance of the magnetron directly influence the performance of the microwave system.
The microwave source, the microwave power source and the microwave power source are input through three-phase alternating current, the rectified alternating current is boosted to high voltage through a transformer, the high voltage electrically excites the magnetron to generate electrons at high temperature, and stable microwave oscillation is formed in the magnetron to generate microwave energy. Microwave sources, microwave power sources and microwave power sources are widely applied to the fields of radar systems, food industry, wood processing, rubber industry and the like.
The microwave generating process is accompanied with energy conversion, a microwave source, a microwave power source, an inverter radiator in a microwave power supply, a high-frequency transformer, a magnetron, a circulator, a water load, an electromagnet and the like all generate heat, and the high-frequency transformer is a high-voltage device and has higher requirements on the temperature of a working environment.
However, the existing microwave power supply has poor heat dissipation performance for the high-frequency transformer, which causes the high-frequency transformer to work in a high temperature environment for a long time, and thus the high-frequency transformer is easily damaged and the microwave power supply cannot be normally used.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides the high-power microwave power supply with high-efficiency heat dissipation, which can effectively overcome the defect of poor heat dissipation performance of a high-frequency transformer in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-power microwave power supply with efficient heat dissipation comprises a first rectification filter module, a first rectifier filter module, a second rectification filter module, a second rectifier filter module and a driving module, wherein the first rectification filter module is used for connecting an input signal and rectifying and filtering the input signal, the first rectification filter module is connected with a resonance half-bridge circuit module used for generating an alternating signal, the output end of the resonance half-bridge circuit module is connected with a primary winding of a high-frequency transformer, a secondary winding of the high-frequency transformer is connected with the second rectification filter module used for rectifying and filtering, and the resonance half-bridge circuit module is connected with;
the resonant half-bridge circuit module comprises a first switch Q1 and a second switch Q2, and the driving module drives the first switch Q1 and the second switch Q2 to be switched on or off to generate alternating signals on a primary winding of the high-frequency transformer;
the high-frequency transformer is characterized in that a heat-conducting shell is arranged outside the high-frequency transformer, a partition plate is fixed inside the heat-conducting shell, the high-frequency transformer is fixed with the inner wall of the heat-conducting shell and the partition plate through a heat-conducting silica gel layer, a water tank is fixed between the partition plate and the inner wall of the heat-conducting shell, a water pump is arranged below the water tank, the top of the water tank is communicated with a spiral radiating tube, a radiating fan is installed at the top of the heat-conducting shell and opposite to the spiral radiating tube, the water outlet end of the water pump is communicated with a water outlet pipe of the partition plate, the end of the spiral radiating tube is communicated with a water inlet pipe of the partition plate, the water outlet pipe is.
Preferably, the first rectifying and filtering module and the second rectifying and filtering module both include a bridge rectifier circuit and a capacitor filter circuit.
Preferably, the driving signal output by the driving module is a PWM signal.
Preferably, the part of the heat conduction pipe, which is located inside the heat conduction silica gel layer, penetrates through the heat conduction silica gel layer in a zigzag manner.
Preferably, the heat-conducting shell is provided with heat-radiating holes at the opposite positions of the side wall and the spiral heat-radiating pipe.
Preferably, a dust filter screen is fixedly mounted on the air inlet side of the cooling fan.
(III) advantageous effects
Compared with the prior art, the high-power microwave power supply capable of efficiently radiating heat provided by the invention has the following beneficial effects:
1. the first rectifying and filtering module is connected with an input signal and carries out rectifying and filtering on the input signal, the vibrating half-bridge circuit module generates an alternating signal, the output end of the resonant half-bridge circuit module is connected with a primary winding of the high-frequency transformer, the driving module drives the first switch Q1 and the second switch Q2 to be switched on or off to generate the alternating signal on the primary winding of the high-frequency transformer, a secondary winding of the high-frequency transformer is connected with the second rectifying and filtering module for carrying out rectifying and filtering, and the output end of the second rectifying and filtering module is connected with a load magnetron;
2. utilize the heat conduction silica gel layer to derive high frequency transformer work heat, the cooling water of water pump in with the water tank passes through the outlet pipe suction in the tortuous heat pipe that runs through the heat conduction silica gel layer, takes out the heat in the heat conduction silica gel layer with the help of the cooling water, passes through radiator fan and spiral radiating tube's heat dissipation again with heat discharge heat conduction casing to can effectively dispel the heat to high frequency transformer, form the effective protection to high frequency transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic circuit diagram of a resonant half-bridge circuit module according to the present invention;
FIG. 3 is a schematic view of an external heat dissipation structure of the high-frequency transformer according to the present invention;
in the figure:
1. a high-frequency transformer; 2. a thermally conductive housing; 3. a partition plate; 4. a heat conductive silica gel layer; 5. a water tank; 6. a water pump; 7. a spiral radiating pipe; 8. a heat radiation fan; 9. a water outlet pipe; 10. a heat conducting pipe; 11. and (4) a water inlet pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A high-power microwave power supply with efficient heat dissipation is disclosed, as shown in figures 1 to 3, and comprises a first rectifying and filtering module for accessing an input signal and rectifying and filtering the input signal, wherein the first rectifying and filtering module is connected with a resonant half-bridge circuit module for generating an alternating signal, the output end of the resonant half-bridge circuit module is connected with a primary winding of a high-frequency transformer 1, a secondary winding of the high-frequency transformer 1 is connected with a second rectifying and filtering module for rectifying and filtering, and the resonant half-bridge circuit module is connected with a driving module;
the resonant half-bridge circuit module comprises a first switch Q1 and a second switch Q2, and the driving module drives the first switch Q1 and the second switch Q2 to be switched on or off to generate alternating signals on a primary winding of the high-frequency transformer 1;
1 outside of high frequency transformer is equipped with heat conduction casing 2, 2 inside
The first rectifying and filtering module and the second rectifying and filtering module both comprise a bridge rectifier circuit and a capacitor filter circuit.
The driving signal output by the driving module is a PWM signal.
The
The side wall of the heat conducting shell 2 is provided with heat radiating holes at the opposite positions of the spiral heat radiating pipe 7.
The air inlet side of the cooling fan 8 is fixedly provided with a dust filter screen.
The first rectifying and filtering module is connected with an input signal and carries out rectifying and filtering on the input signal, the vibrating half-bridge circuit module generates an alternating signal, the output end of the resonant half-bridge circuit module is connected with a primary winding of the high-frequency transformer 1, the driving module drives the first switch Q1 and the second switch Q2 to be switched on or off to generate the alternating signal on the primary winding of the high-frequency transformer 1, a secondary winding of the high-frequency transformer 1 is connected with the second rectifying and filtering module for carrying out rectifying and filtering, and the output end of the second rectifying and filtering module is connected with a load magnetron.
The resonant half-bridge circuit module working process is analyzed as follows:
q1 is off and Q2 is on. At this time, the current in the resonant inductor Lr is negative, and the direction is Q2. In this stage, the leakage inductance Lm of the transformer does not participate in resonance, Cr and Lr form a resonance frequency, output energy comes from Cr and Lr, and the stage is ended with the turn-off of Q2.
Q1 off, Q2 off. At this time, the current in the resonant inductor Lr is still negative for the dead time of the half-bridge circuit, the resonant current discharges the output capacitor of Q1, and charges the output capacitor of Q2 until the voltage of the output capacitor of Q2 is equal to the input terminal Vin, thereby creating a zero-voltage conduction condition for the next conduction of Q1. Because the diode in the Q1 is in forward bias, and the diode in the Q2 is in reverse bias, the currents on the two inductors are equal, the output voltage is higher than the voltage of the secondary side of the transformer, and the D1 and the D2 are in reverse bias states, the output end is separated from the transformer. This phase Lm, Lr, Cr resonates together and ends with Q1 turned on.
Q1 is on and Q2 is off. At this time, the current on the resonant inductor Lr is still negative, the current flows back to the input terminal Vin through the diode in Q1, the output rectifying diode D1 is turned on to supply energy to the output terminal, the leakage inductance Lm of the transformer is continuously charged at this stage, and only Lr and Cr participate in resonance. This phase ends as soon as the current on the resonant inductor Lr is zero.
Q1 is on and Q2 is off. The resonant inductor Lr current begins to flow from the input Vin to ground through Q1, and the transformer leakage inductance Lm is now charged by this current, so the only devices participating in resonance are Lr and Cr, and the input Vin is still powered by the output rectifying diode D1. This phase ends with Q1 turned off.
Q1 is off and Q2 is off. The phase is half-bridge circuit dead time, the resonant inductor Lr current charges an output capacitor of the Q1 and discharges an output capacitor of the Q2 until the voltage of the output capacitor on the Q2 is zero, and a diode in the Q2 is turned on, so that a condition is created for zero-voltage turn-on of the Q2. During this time, the secondary side of the transformer is disengaged from the primary side and the transformer leakage inductance Lm participates in the resonance. This phase ends with Q2 turned on.
Q1 is off and Q2 is on. Since the output capacitor of Q2 has been discharged to zero in the previous phase, Q2 is turned on at zero voltage, energy freewheels from the resonant inductor Lr through Q2, and the output terminal is supplied with energy from the output rectifying diode D2. At this time, Lm does not participate in the resonance of Lr and Cr, and this stage ends as the resonant inductor Lr current becomes zero. The above working phases are repeated.
Utilize heat conduction silica gel layer 4 to derive high frequency transformer 1 work heat, water pump 6 passes through the cooling water in the water tank 5 among the
The
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
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