CN106787781A - A kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors - Google Patents
A kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors Download PDFInfo
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- CN106787781A CN106787781A CN201710029066.7A CN201710029066A CN106787781A CN 106787781 A CN106787781 A CN 106787781A CN 201710029066 A CN201710029066 A CN 201710029066A CN 106787781 A CN106787781 A CN 106787781A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3381—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement using a single commutation path
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention is a kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors, belongs to microwave applications device equipment technical field.The invention mainly comprises input rectifying filter circuit, half-bridge LLC formula filaments power supply circuit, LCC resonant converter main circuits, the communicating circuits of RS 485 etc., the data from host computer are on the one hand received by the buses of two-way RS 485 and is ordered and is performed, on the other hand the various electrical parameters of electrical parameter measuring module measurement are read, remote control is realized；Using half-bridge LLC formula filament power supply circuits, the direct current supply of filament is realized.Technology of Internet of things of the present invention with microprocessor as core, realizes the remote monitoring of microwave applications device, and operating personnel not only may be located remotely from microwave applications device, can also simultaneously control many microwave applications devices；The mechanism being combined using LLC soft switch techniques and synchronous rectification, makes the electronics that magnetron cathode sends evenly, enhances the stability of microwave applications device system.
Description
Technical field
The present invention relates to a kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors, belong to microwave applications device and set
Standby technical field.
Background technology
Microwave applications device is mainly used in synthesis and the sintering of materials synthesis, sintering, heating etc., particularly material, to temperature
Write music line requirement it is especially high, so for microwave applications device not only need close friend man-machine interaction environment, in addition it is also necessary to have one
The closed loop control process of the stabilization based on temperature.Other equipment should also have a series of spies such as miniaturization, high efficiency, environmental protection
Point.
The negative electrode of magnetron is the emitter of electronics, is again a part of interaction space.The performance pair of negative electrode
The working characteristics and aging effects of pipe greatly, are considered as the heart of whole pipe.The temperature when cathode leg of high-power pipe works
Degree is very high, commonly uses forced air cooling radiating.To prevent overheating anode because of electron back bombardment, dropped by regulation after magnetron working stability
Low cathode current is increasing the service life.However, traditional magnetron cathode is powered using exchange 3.3V/10A power supplys, it is right
The stability of pipe and life-span all have significant effect.
Existing microwave applications device with local operation, but can be unable to remote control, be not easy to realize the centralized Control of system,
The treatment and storage of data and the derivation of form etc. function.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors
System, by increasing remote control function, conveniently realizes the treatment and storage and the derivation of form of the centralized Control, data of system
Etc. function；Change the power supply mode of existing magnetron cathode, make the electronics that magnetron cathode sends evenly, enhance microwave
The stability of applicator system.
The technical scheme is that：A kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors, including civil power,
Input rectifying filter circuit, half-bridge LLC formula filaments power supply circuit, LCC resonant converter main circuits, auxiliary power circuit, input
Voltage and current detection circuit, light occasionally isolation and drive circuit, output electric current measure and amplifying circuit, the given control panel of power,
Microprocessor, output rectifier and filter, magnetron, material-to-be-heated, thermocouple, RS-485 communicating circuits, host computer；
Civil power is attached by input rectifying filter circuit with LCC resonant converter main circuits, LCC controlled resonant converter masters
Circuit output end is connected by output rectifier and filter with the anode of magnetron, the input of half-bridge LLC formula filament power supply circuits
End is electrically connected by input rectifying filter circuit with city, and output end is connected by output rectifier and filter with the negative electrode of magnetron
Connect, auxiliary power circuit input is connected with input rectifying filter circuit, output end is occasionally isolated and driven with microprocessor, light respectively
Dynamic circuit, output electric current measure and amplifying circuit connection, input voltage, current detection circuit input and input rectifying filtered electrical
The output end connection on road, output end is connected with microprocessor, and occasionally isolation is connected light with drive circuit input with microprocessor, defeated
Go out end to be connected with LCC resonant converter main circuits, output electric current measure is filtered with output rectification respectively with the input of amplifying circuit
The output end connection of wave circuit, output end is connected with microprocessor, and the given control panel of thermocouple, power connects with microprocessor
Connect, the output end of magnetron and material-to-be-heated connection, material-to-be-heated output end is connected with thermocouple, RS-485 communication electricity
Road one end is connected with microprocessor, and the other end is connected with host computer, and on the one hand RS-485 communicating circuits are received from host computer
Data and order and send microprocessor to and perform, on the other hand read the various electrical parameters that detect of microprocessor and be simultaneously sent to
Host computer.
Preferably, described LCC resonant converter main circuits include full bridge inverter, LCC series parallel resonances loop with
And high frequency high voltage step-up transformer；
Described full bridge inverter includes four switching tube Q1、Q2、Q3、Q4, switching tube Q1、Q2、Q3、Q4Inside collects respectively
Into having backward dioded and each switching tube two ends and a upper small capacitances；
Described resonant tank includes series resonance inductor Lr, parallel resonance electric capacity CrpWith series resonant capacitance Crs；
The primary and parallel resonance electric capacity C of described high frequency high voltage step-up transformerrpParallel connection, secondary and output rectification filter
Circuit is connected,
Four control signals of switching tube of full bridge inverter export 4 road pwm signals and are driven by microprocessor.
Preferably, 4 tunnel PWM signal frequencies of described microprocessor output are identical, and dutycycle is 50%.
Preferably, described output rectifier and filter includes four fast-recovery commutation diodes, high pressure resistant output filtering
Electric capacity Cout, four fast-recovery commutation diodes composition full bridge rectifiers and it is connected with the secondary of high frequency high voltage step-up transformer,
High pressure resistant output filter capacitor CoutIt is connected with four fast-recovery commutation diodes parallel connections and with anode of magnetron.
Preferably, described microprocessor uses STM32F407ZGT6.
Preferably, described half-bridge LLC formula filaments power supply circuit includes semi-bridge inversion mixed-media network modules mixed-media, LLC resonant network moulds
Block, transformer, one end of semi-bridge inversion mixed-media network modules mixed-media are connected with microprocessor, input rectifying filter circuit respectively, the other end with
One end connection of LLC resonance modules, the other end of LLC resonance modules is connected with one end of transformer module, transformer module
The other end is connected with output rectification filter module.
Operation principle of the invention is：On the one hand the present invention receives the data from host computer by two-way RS-485 buses
With order and perform, on the other hand read electrical parameter measuring module measurement various electrical parameters.Additionally, also passing through A/D converter
Electric signal of the conversion from thermocouple, and it is converted into temperature value；The jumbotron that host computer is provided with can be very well with figure side
Formula is presented the running status of system, and is also convenient for carrying out the treatment and storage of data；Received from existing by key scan
The control information that the data or reception host computer of field control panel input send performs control, while by control result in microwave
The display screen display of applicator and host computer.The controlled output of microprocessor is by 4 tunnels with the pwm signal of frequency displacement phase come real
It is existing, 4 switching tubes on 4 road pwm signal control electric power driving modules, so that realize to output power, additionally, using
The mechanism that LLC soft switch techniques and synchronous rectification are combined, realizes the direct current supply of filament.
By function point, two functional areas can be divided into：(1) the high direct voltage output of anode of magnetron, the measurement of electrical parameter by
STM32F407 and CS5460A are completed jointly, and CS5460A is responsible for being acquired signal and computing, obtains normalizing each electrical parameter
Value, STM32F407 is then responsible for processing normalized data, and transfers data to main control module.Temperature survey is led to
Cross thermocouple and signal amplification circuit filter to realize, the signal after amplification is directly digitally converted by A/D converter, most
Afterwards, by RS-485 communicating circuits, the result of microprocessor is sent to host computer, realizes the transmitted in both directions of signal；
(2) output powered to magnetron heater, the alternating current of input civil power 220V/50HZ, by lightning-protection module, EMI
After the protection mechanisms such as module, the 310V DC voltages that rectifying and wave-filtering is stablized are carried out.Then, semi-bridge inversion network is according to setting
Frequency, then direct current is become the square-wave signal matched with setpoint frequency, LLC resonance modules are then semi-bridge inversion network
MOSFET pipes realize that Sofe Switch work provides primary condition, then by the step-down of power conversion transformer, output meets magnetic
The alternating voltage that keyholed back plate filament is powered, by becoming direct current after circuit of synchronous rectification directly for magnetron heater is powered.Same
In step rectification circuit, drive circuit detects the electric current in circuit by current transformer in real time, and in good time turning on and off is same
Step rectifying tube SR1 and SR2, the effect of rectification is carried out to reach instead of conventional diode.
The beneficial effects of the invention are as follows：(1) technology of Internet of things with microprocessor as core, realizes the remote of microwave applications device
Range monitoring, operating personnel not only may be located remotely from microwave applications device, can also simultaneously control many microwave applications devices, host computer it is super
Giant-screen can to graphically carry out the running status of real-time rendering system very well, and be also convenient for carrying out the treatment of data and deposit
Storage；(2) to the defect of unstable properties in microwave applications device filament electric power system, the mechanism of direct current supply is employed, by soft
The scheme that switch is combined with the technology of synchronous rectification two so that under the filament electric power thus supplied of low-voltage, high-current, realize efficient mesh
's.By using direct current supply mechanism, the stability of magnetron cathode launching electronics is improve, meanwhile, can the moon more easy to control
The supply current of pole, in the different heating stage, using different electric current power supply plans, largely avoided electronics returns Hong phenomenon, reaches
To magnetron efficient operation, meanwhile, effectively extend the life-span of magnetron.
Brief description of the drawings
Fig. 1 is that overall structure of the invention connects block diagram；
Fig. 2 is the minimum system circuit diagram of microprocessor STM32F407ZGT6；
Fig. 3 is the circuit diagram of RS-485 communicating circuits；
Fig. 4 is the microwave applications device power circuit topology design drawing based on LCC resonant networks；
Fig. 5 is the circuit diagram of auxiliary power circuit；
Fig. 6 is the circuit diagram of linear optical coupling isolation circuit；
Fig. 7 is the circuit diagram of IGBT drive circuit；
Fig. 8 is the circuit diagram of voltage signal change-over circuit；
Fig. 9 is the circuit diagram of current signal change-over circuit；
Figure 10 is the connection circuit diagram of CS5460 analog to digital conversion circuits and microprocessor STM32F407ZGT6；
Figure 11 is the circuit diagram of thermocouple signal filtering and amplifying circuit；
Figure 12 is the circuit of temperature sensor LM75A；
Figure 13 is the circuit diagram of traditional filament power supply circuit；
Figure 14 is the integrated connection block diagram of half-bridge LLC formula filament power supply circuits of the present invention and peripheral circuit；
Figure 15 is the main circuit diagram of half-bridge LLC formulas filament power supply circuit of the present invention；
Figure 16 is the circuit diagram of circuit of synchronous rectification in Figure 15；
Figure 17 is the circuit diagram of the drive circuit of synchronous rectification in Figure 15.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1：As shown in Fig. 1-17, a kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors, including city
It is electricity, input rectifying filter circuit, half-bridge LLC formula filaments power supply circuit, LCC resonant converter main circuits, auxiliary power circuit, defeated
Enter voltage and current detection circuit, light occasionally isolation and drive circuit, output electric current measure and amplifying circuit, the given control of power
Plate, microprocessor, output rectifier and filter, magnetron, material-to-be-heated, thermocouple, RS-485 communicating circuits, host computer；
Civil power is attached by input rectifying filter circuit with LCC resonant converter main circuits, LCC controlled resonant converter masters
Circuit output end is connected by output rectifier and filter with the anode of magnetron, the input of half-bridge LLC formula filament power supply circuits
End is electrically connected by input rectifying filter circuit with city, and output end is connected by output rectifier and filter with the negative electrode of magnetron
Connect, auxiliary power circuit input is connected with input rectifying filter circuit, output end is occasionally isolated and driven with microprocessor, light respectively
Dynamic circuit, output electric current measure and amplifying circuit connection, input voltage, current detection circuit input and input rectifying filtered electrical
The output end connection on road, output end is connected with microprocessor, and occasionally isolation is connected light with drive circuit input with microprocessor, defeated
Go out end to be connected with LCC resonant converter main circuits, output electric current measure is filtered with output rectification respectively with the input of amplifying circuit
The output end connection of wave circuit, output end is connected with microprocessor, and the given control panel of thermocouple, power connects with microprocessor
Connect, the output end of magnetron and material-to-be-heated connection, material-to-be-heated output end is connected with thermocouple, RS-485 communication electricity
Road one end is connected with microprocessor, and the other end is connected with host computer, and on the one hand RS-485 communicating circuits are received from host computer
Data and order and send microprocessor to and perform, on the other hand read the various electrical parameters that detect of microprocessor and be simultaneously sent to
Host computer.
Further, described LCC resonant converter main circuits include full bridge inverter, LCC series parallel resonances loop
And high frequency high voltage step-up transformer；
Described full bridge inverter includes four switching tube Q1、Q2、Q3、Q4, switching tube Q1、Q2、Q3、Q4Inside collects respectively
Into having backward dioded and each switching tube two ends and a upper small capacitances；
Described resonant tank includes series resonance inductor Lr, parallel resonance electric capacity CrpWith series resonant capacitance Crs；
The primary and parallel resonance electric capacity C of described high frequency high voltage step-up transformerrpParallel connection, secondary and output rectification filter
Circuit is connected,
Four control signals of switching tube of full bridge inverter export 4 road pwm signals and are driven by microprocessor.
Further, 4 tunnel PWM signal frequencies of described microprocessor output are identical, and dutycycle is 50%.
Further, described output rectifier and filter includes four fast-recovery commutation diodes, high pressure resistant output filter
Ripple electric capacity Cout, four fast-recovery commutation diodes composition full bridge rectifiers and with the secondary cascade of high frequency high voltage step-up transformer
Connect, high pressure resistant output filter capacitor CoutIt is connected with four fast-recovery commutation diodes parallel connections and with anode of magnetron.
Further, described microprocessor uses STM32F407ZGT6.
Further, described half-bridge LLC formula filaments power supply circuit includes semi-bridge inversion mixed-media network modules mixed-media, LLC resonant networks
Module, transformer, one end of semi-bridge inversion mixed-media network modules mixed-media are connected with microprocessor, input rectifying filter circuit respectively, the other end
One end with LLC resonance modules is connected, and the other end of LLC resonance modules is connected with one end of transformer module, transformer module
The other end be connected with output rectification filter module.
As shown in figures 14-17, the complete input and output connected mode of half-bridge LLC formulas filament power supply circuit of the invention is：
Lightning-protection module one end electrically connects with city, and the other end is connected with one end of EMI modules, the other end and the rectifying and wave-filtering electricity of EMI modules
Road is connected, and the current rectifying and wave filtering circuit module other end is connected with semi-bridge inversion module, the other end and the LLC resonance of semi-bridge inversion module
Mixed-media network modules mixed-media is connected, and the LLC resonant network module other ends are connected with the primary side of transformer, and the secondary of transformer is examined with electric current respectively
Survey the input of module, the input of synchronous rectification module to be connected, the output end of synchronous rectification module connects with the negative electrode of magnetron
Connect, the drive connection end of semi-bridge inversion module is connected with the output end of semi-bridge inversion drive module, semi-bridge inversion drive module
Input is connected with microprocessor, and the output end of current detection module is connected with the input of synchronous rectification drive module, synchronous
The other end of rectification drive module is connected with the drive end of synchronous rectification module.
Whole system by the modules such as semi-bridge inversion network, LLC resonance modules, circuit of synchronous rectification realize Sofe Switch with it is same
Walk being combined for commutation technique.
Uab is exported in Figure 15 to be connected with the input Uab of Figure 16, is constituted a complete modified magnetron heater and is powered
Main circuit, Q1's and Q2 in Figure 15 turns on and off the pwm signal produced by microprocessor STM32F407ZGT6 through overdriving
It is controlled after circuit, drive circuit is the circuit of Fig. 7, in figure 16, traditional fast quick-recovery two is instead of by MOSFET pipes
Pole pipe is designed with realizing synchronous rectification, wherein, two drive circuits of MOSFET are shown in Figure 17, by Current Transmit 1
And CT2, the electric current in detection circuit, opens and judges synchronous rectifier SR1 and SR2, so the output of Figure 17 in good time in real time
The SR1 of Vo1 connection figures 16, the similarly SR2 of Vo2 connection figures 16.
The alternating current of input civil power 220V/50HZ, by after the protection mechanisms such as lightning-protection module, EMI modules, carrying out rectification filter
The 310V DC voltages that ripple is stablized.Then, semi-bridge inversion network is according to the frequency for setting, then direct current is become and set
Determine the square-wave signal that frequency matches, LLC resonance modules are then for the MOSFET pipes of semi-bridge inversion network realize that Sofe Switch work is carried
Primary condition has been supplied, then by the step-down of power conversion transformer, output meets the alternating voltage that magnetron heater is powered, passes through
Become direct current after circuit of synchronous rectification directly for magnetron heater is powered.In circuit of synchronous rectification, drive circuit is by electricity
Current transformer detects the electric current in circuit in real time, and in good time turns on and off synchronous rectifier SR1 and SR2, to reach replacement
Conventional diode carries out the effect of rectification.
Specification part accompanying drawing is specifically described：Fig. 1 is the total electric power system of microwave applications device, mainly includes anode
High voltage supply and filament low-voltage, high-current power two partly, are core by microprocessor for the normal work of magnetron provides condition
The heart constitutes main control module, and electrical parameter measuring module is constituted by output and output current, voltage detecting circuit, by isolation, drives
Dynamic circuit constitutes drive module；Fig. 2 is STM32F407ZGT6 minimum system circuit diagrams；3 is RS-485 communications electricity of the present invention
Road, realizes the interconnection of microprocessor and host computer, finally realizes remote control；Fig. 5 is system supplymentary power supply diagram, is minimum system
Powered with electric energy computation chip etc.；Fig. 6 is linear optical coupling isolation circuit diagram, realizes isolating for digital display circuit and high-pressure system, is risen
To the effect for protecting digital display circuit not disturbed by high-pressure system；Fig. 7 is the circuit diagram of IGBT drive circuit, and LCC is humorous in belonging to Fig. 1
Shake isolating between converter module and microprocessor, drive module, play isolation with drive it is complete in LCC controlled resonant converter modules
4 IGBT pipes of bridge inversion network；Fig. 8 and Fig. 9 is voltage and current signal conversion circuit figure, by voltage transformer and electric current
Transformer is acquired to the input/output information of power-supply system, reconnects the electric parameter measurement special chip CS5460 realities of Figure 10
Existing analog-to-digital conversion, electric parameter metering module is constituted with this special chip, it is corresponding be the input in Fig. 1 and output voltage,
Current module.Figure 11 is thermocouple signal filtering and amplifying circuit, and the signal to thermocouple output voltage amplifies filtering, and the first order is adopted
Differential amplification filter circuit is used, it can eliminate the common-mode signal in signal, such that it is able to improve the interference of doing of system, second
Level is employed with a little filtering and amplifying circuits are thought, the quality factor of low pass filter can be improved by way of two-stage, effectively
High-frequency signal is filtered out, signal isolation is carried out into adding a voltage follower before converter in signal in addition, with
Ensure the filtering and amplifying circuit of prime is not influenceed by late-class circuit.Figure 12 is the circuit diagram of temperature sensor LM75A, belongs to figure
Thermocouple module part in 1, is responsible for detecting material-to-be-heated temperature, and the temperature value for measuring is sent to control
In device STM32F407；Figure 13 is traditional filament power supply circuit, is input into civil power 220V, and the exchange for exporting low-voltage, high-current supplies electricity to lamp
Silk power supply；Figure 14 to Figure 16 is that filament of the present invention is powered main circuit, the soft switch technique realized using semibridge system LLC resonance and same
Step commutation technique, the DC voltage of outputting high quality is powered for filament, realizes the efficient, controllable of power supply.
High efficient high power density is an important development trend of power electronic product.LLC resonance DC/DC current transformers exist
Conversion efficiency and power density aspect have prominent advantage.But in the applied field of this low-voltage, high-current output of filament supply
Close, the loss of its secondary side rectification circuit often account for the sizable proportion of total losses.Synchronous rectification with conducting resistance very
Small MOSFET replaces diode, greatly improves the conversion efficiency of current transformer.And metal-oxide-semiconductor is positive temperature characterisitic, is being adopted
With two or more it is in parallel when, can be with automatic current equalizing, so as to ensure that the reliability of device.Therefore, LLC resonance unsteady flow
Type synchronous rectification has positive meaning to improving microwave applications device efficiency.
Microwave applications device can with local operation, but for convenience the treatment and storage of the centralized Control, data of system and
Derivation of form etc. function, system needs to increase remote control function.By remote control operation, personnel not only may be located remotely from
Microwave applications device, can also simultaneously control the jumbotron of many microwave applications devices, host computer can come to graphically very well
The running status of presentation system, and it is also convenient for carrying out the treatment and storage of data.Host computer and microwave applications device are by being based on
MODBUS agreement RS485 buses are attached, can not only long range carry out data transmission also have interference free performance higher.
Other industrial host computer has serial line interface, only needs a modular converter just to realize the connection of same RS485 buses.
Microwave applications device of the invention with magnetron as control target, with electric power driving module as middleware, by embedding
Embedded system realizes the communication and the control of system with host computer.Control system by main control module, electrical parameter measuring module,
The modules such as electric power driving module, thermocouple are constituted.Wherein main control module communicates electric comprising single-chip microcomputer STM32F407, RS-485
Road, button display circuit, signal amplify filtered circuit etc..Each performs its own functions for they, cooperates, quick and without any confusion complete
Into system monitoring work, whole system fundamental diagram is as shown in Figure 1.With the STM32F407 of 32 it is core in main control module
The heart, realizes fusion, the computing of algorithm, the output of controlled quentity controlled variable, the generation of pwm signal and the man-machine dialogue system of measurement data.
On the one hand main control module is received the data from host computer by two-way RS-485 buses and orders and perform, and is on the other hand read
The various electrical parameters of power taking parameters measurement module measurement.Additionally, the A/D converter also by being carried inside STM32 is changed and come from
The electric signal of thermocouple, and it is converted into temperature value；Received from microwave applications device control panel by bond number by key scan
According to the control command sent with long-range PC ends and perform, while implementing result and current system running status are shown in into microwave
On the display screen of applicator and PC.The controlled output of microprocessor realized by 4 tunnels with the pwm signal of frequency displacement phase, 4 road PWM
4 switching tubes in signal control power supply drive module, so as to realize to output power；Half-bridge LLC formula filaments are powered electricity
Road mainly constitutes including semi-bridge inversion network, LLC resonance modules, transformer module, circuit of synchronous rectification and drive module etc..Its
In, semi-bridge inversion network is the DC power conversion of single-frequency into certain frequency square-wave signal；LLC resonance modules, then lead to
Crossing resonance makes system have the condition for realizing Sofe Switch；Circuit of synchronous rectification, then replace traditional by with special MOSFET pipes
Diode carries out rectification, realizes the high-effect of power supply, the machine being combined using this LLC soft switch techniques and synchronous rectification
System, effectively raises the efficiency of low-voltage high-current power source, and the output voltage that can improve traditional filament Alternating Current Power Supply is unstable
With the uppity deficiency of output current, make the electronics that negative electrode sends evenly, enhance the stability of microwave applications device system.
Specific embodiment of the invention is explained in detail above in association with accompanying drawing, but the present invention be not limited to it is above-mentioned
Implementation method, in the ken that those of ordinary skill in the art possess, can also be before present inventive concept not be departed from
Put that various changes can be made.
Claims (6)
1. a kind of microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors, it is characterised in that：Including civil power, input rectifying
Filter circuit, half-bridge LLC formula filaments power supply circuit, LCC resonant converter main circuits, auxiliary power circuit, input voltage and electricity
The occasionally isolation of current detection circuit, light and drive circuit, output electric current measure and amplifying circuit, the given control panel of power, microprocessor,
Output rectifier and filter, magnetron, material-to-be-heated, thermocouple, RS-485 communicating circuits, host computer；
Civil power by input rectifying filter circuit respectively with LCC resonant converter main circuits be attached, LCC controlled resonant converters
Main circuit output end is connected by output rectifier and filter with the anode of magnetron, half-bridge LLC formula filament power supply circuits it is defeated
Enter end to be electrically connected with city by input rectifying filter circuit, output end is connected by output rectifier and filter with the negative electrode of magnetron
Connect, auxiliary power circuit input is connected with input rectifying filter circuit, output end is occasionally isolated and driven with microprocessor, light respectively
Dynamic circuit, output electric current measure and amplifying circuit connection, input voltage, current detection circuit input and input rectifying filtered electrical
The output end connection on road, output end is connected with microprocessor, and occasionally isolation is connected light with drive circuit input with microprocessor, defeated
Go out end to be connected with LCC resonant converter main circuits, output electric current measure is filtered with output rectification respectively with the input of amplifying circuit
The output end connection of wave circuit, output end is connected with microprocessor, and the given control panel of thermocouple, power connects with microprocessor
Connect, the output end of magnetron and material-to-be-heated connection, material-to-be-heated output end is connected with thermocouple, RS-485 communication electricity
Road one end is connected with microprocessor, and the other end is connected with host computer, and on the one hand RS-485 communicating circuits are received from host computer
Data and order and send microprocessor to and perform, on the other hand read the various electrical parameters that detect of microprocessor and be simultaneously sent to
Host computer.
2. the microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors according to claim 1, it is characterized in that：It is described
LCC resonant converter main circuits include full bridge inverter, LCC series parallel resonances loop and high frequency high voltage step-up transformation
Device；
Described full bridge inverter includes four switching tube Q1、Q2、Q3、Q4, switching tube Q1、Q2、Q3、Q4Inside is integrated with respectively
Backward dioded and each switching tube two ends and a upper small capacitances；
Described resonant tank includes series resonance inductor Lr, parallel resonance electric capacity CrpWith series resonant capacitance Crs；
The primary and parallel resonance electric capacity C of described high frequency high voltage step-up transformerrpParallel connection, secondary and output rectifier and filter
Connection,
Four control signals of switching tube of full bridge inverter export 4 road pwm signals and are driven by microprocessor.
3. the microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors according to claim 2, it is characterized in that：It is described
Microprocessor output 4 tunnel PWM signal frequencies it is identical, dutycycle is 50%.
4. the microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors according to claim 2, it is characterised in that：Institute
The output rectifier and filter stated includes four fast-recovery commutation diodes, high pressure resistant output filter capacitor Cout, four fast recoveries
Commutation diode constitutes full bridge rectifier and is connected with the secondary of high frequency high voltage step-up transformer, high pressure resistant output filter capacitor
CoutIt is connected with four fast-recovery commutation diodes parallel connections and with anode of magnetron.
5. the microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors according to claim 1, it is characterised in that：Institute
The microprocessor stated uses STM32F407ZGT6.
6. the microwave applications system of remote monitoring LCC resonant cavity enhanced photodetectors according to claim 1, it is characterised in that：Institute
The half-bridge LLC formula filaments power supply circuit stated includes semi-bridge inversion mixed-media network modules mixed-media, LLC resonant networks module, transformer, semi-bridge inversion
One end of mixed-media network modules mixed-media is connected with microprocessor, input rectifying filter circuit respectively, and the other end connects with one end of LLC resonance modules
Connect, the other end of LLC resonance modules is connected with one end of transformer module, the other end and output rectification filter of transformer module
Module is connected.
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| CN108494255A (en) * | 2018-03-12 | 2018-09-04 | 北京四方继保自动化股份有限公司 | A kind of program-controlled LLC resonance transmitter and its control method |
| CN108900084A (en) * | 2018-07-13 | 2018-11-27 | 东南大学 | A kind of direct current-direct current voltage changer of remote numerical control |
| CN108988638A (en) * | 2017-06-01 | 2018-12-11 | 关英怀 | The anti-mode hopping anode supply of microwave therapy apparatus magnetron controllable constant-current |
| CN110086372A (en) * | 2019-04-28 | 2019-08-02 | 成都波辐科技有限公司 | A kind of microwave power source of plated film |
| CN110729901A (en) * | 2019-09-03 | 2020-01-24 | 深圳市崧盛电子股份有限公司 | Power supply and LED light source |
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