CN107134932A - A kind of micro-wave oven variable-frequency power sources - Google Patents
A kind of micro-wave oven variable-frequency power sources Download PDFInfo
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- CN107134932A CN107134932A CN201710548979.XA CN201710548979A CN107134932A CN 107134932 A CN107134932 A CN 107134932A CN 201710548979 A CN201710548979 A CN 201710548979A CN 107134932 A CN107134932 A CN 107134932A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/664—Aspects related to the power supply of the microwave heating apparatus
Abstract
The invention discloses a kind of micro-wave oven variable-frequency power sources, including voltage reduction module, controller, current rectifying and wave filtering circuit, Voltage stabilizing module, bridge inverter main circuit, protection circuit, filter circuit, adjuster and power circuit；Micro-wave oven variable-frequency power sources of the present invention keeps output waveform undistorted using single-chip microcomputer pic16f917, can handle various waveforms, and such as square wave PWM, sine wave SPWM, space phasor PWM, particular harmonic eliminate PWM, Hysteresis Current PWM；Protection circuit is it is possible to additionally incorporate, is controlled using multiple triodes, when short circuit or overload; metal-oxide-semiconductor VS D S voltage across poles rises; as A point voltage UA=UD, (UD is metal-oxide-semiconductor D pole tensions), diode D4 conductings, raise A points current potential; the interlock circuit upset being made up of VT2, VT3; VT5 is instantaneously turned on, turn off VS, be allowed to be effectively protected; the output frequency of bridge inverter main circuit can also be changed by adjuster simultaneously, the purpose of frequency conversion is reached.
Description
Technical field
The present invention relates to a kind of micro-wave oven variable-frequency power sources, specifically a kind of micro-wave oven variable-frequency power sources.
Background technology
It is well known that we used in mains frequency be 50Hz, still, in real life, it is sometimes desirable to power supply
Frequency is not 50Hz.Therefore converter technique is needed to use, existing application of frequency converter is extensive, such as convertible frequency air-conditioner, frequency conversion refrigerator
Etc., the need of work of frequency converter uses inversion transformation technique.
Inverter developed into today from 1969, experienced the evolution of decades.Its control mode is also occurred in that perhaps
It is many, it can substantially be divided into：Transformation and VFC.What use was more is the i.e. PWM controls of pulse modulation technology in transformation at present
Technology, i.e., using the pulse width for controlling output voltage, DC voltage is modulated into the ac output voltage of constant amplitude variable-width
Pulse, to control virtual value, the distribution of control harmonic wave of output voltage and the suppression harmonic wave of output voltage.PWM technologies can be rapid
Ground controls output voltage, and its effectively carries out harmonics restraint, and its dynamic response is good, all in output voltage quality, efficiency etc.
Aspect has clear advantage.
According to the difference for forming PWM ripple principles, it can be divided into following several：Square wave PWM, sine wave SPWM, space phase
Measure PWM, particular harmonic and eliminate PWM, Hysteresis Current PWM etc..This four classes PWM ripple respectively has advantage and disadvantage, thus suitable for different fields
Close.
In addition, many protection circuits can use MOS field effect transistor tube regulators, typically apply in the grid of metal-oxide-semiconductor
One adjustable drive signal, the turn-on and turn-off time of metal-oxide-semiconductor is controlled by adjusting the dutycycle of drive signal, so that
Output is adjustable, controllable voltage, but many existing MOS adjusters all lack one and are effectively protected, especially
Short-circuit protection, much engineers follow the line of least resistance now, all like being designed using special protection chip, cost is higher.
The content of the invention
It is an object of the invention to provide a kind of high micro-wave oven variable-frequency power sources of stability, to solve in above-mentioned background technology
The problem of proposition.
To achieve the above object, the present invention provides following technical scheme：
A kind of micro-wave oven variable-frequency power sources, including voltage reduction module, controller, current rectifying and wave filtering circuit, Voltage stabilizing module, bridge type inverse
Circuit, protection circuit, filter circuit, adjuster and power circuit；The input connection alternating current AC of the voltage reduction module, decompression
The output end connection current rectifying and wave filtering circuit of module, the output end of current rectifying and wave filtering circuit connects the input of Voltage stabilizing module, voltage stabilizing mould
The output end connection bridge inverter main circuit of block, alternating current AC also connects controller, protection circuit and tune respectively by power circuit
Device is saved, adjuster is also respectively connected with controller and bridge inverter main circuit, and bridge inverter main circuit is arrived by filter circuit output voltage
Used in micro-wave oven for it.
It is used as further scheme of the invention：The voltage reduction module is step-down transformer.
It is used as further scheme of the invention：The controller uses single-chip microcomputer pic16f917.
It is used as further scheme of the invention：The mu balanced circuit includes chip IC 1, triode V1, inductance L1 and two poles
Pipe D1, it is characterised in that the pin 5 of the chip IC 1 connects resistance R5, resistance R6, power supply VCC and triode V2 transmitting
Pole, the connection of pin 3 the resistance R1, resistance R1 of chip IC 1 other end connection resistance R2, resistance R3 and electric capacity C1, resistance R2's
The other end connects the pin 4 of resistance R4 and chip IC 1, resistance R5 other end connecting triode V1 base stage and chip IC 1
Pin 8, triode V1 emitter stage connecting triode V2 base stage and the resistance R6 other end, triode V1 colelctor electrode connection
Triode V2 colelctor electrode, the resistance R4 other end, diode D1 negative electrode and inductance L1, the connection resistance of pin 7 of chip IC 1
R7 and the pin of chip IC 19, resistance R7 other end connection electric capacity C2, the inductance L1 other end, pin 2, the core of chip IC 1
Piece IC1 pin 6 and output voltage U1.
It is used as further scheme of the invention：The model μ A723 of the chip IC 1.
It is used as further scheme of the invention：The triode V1 and V2 is p-type triode.
It is used as further scheme of the invention：The protection circuit includes triode VT1, transformer T, resistance R1, two
Pole pipe D1 and metal-oxide-semiconductor VS, described resistance R1 one end connect respectively power supply VCC, triode VT2 emitter stages, resistance R3, resistance R8 and
Triode VT4 colelctor electrodes, the resistance R1 other ends connect resistance R2 and transformer T coil L1, the transformer T coil L1 other ends respectively
The connection resistance R2 other ends and triode VT1 colelctor electrodes, triode VT1 grounded emitters respectively, triode VT1 base stages, which are connected, to be controlled
Signal Vi processed, transformer T coil L2 one end connect grounding resistance R5, resistance R4 and triode VT3 base stages, triode VT3 respectively
Emitter stage connects grounding resistance R6, the transformer T coil L2 other ends and diode D4 negative poles respectively, and diode D4 positive poles connect respectively
The connecting resistance R8 other ends and diode D3 positive poles, diode D3 negative poles connect output end vo and metal-oxide-semiconductor VS D poles, metal-oxide-semiconductor respectively
VS S poles are distinguished connecting triode VT5 colelctor electrodes and resistance R9 and are grounded, resistance R9 other ends difference connecting triode VT5 bases
Pole, triode VT4 base stages and resistance R7, triode VT4 emitter stages difference connecting triode VT5 emitter stages and metal-oxide-semiconductor VS G
Pole, the resistance R7 other ends connect the resistance R4 other ends, diode D1 positive poles and triode VT2 colelctor electrodes, triode VT2 bases respectively
Pole connects the resistance R3 other ends and diode D2 positive poles, diode D2 negative poles difference connecting triode VT3 colelctor electrodes and two respectively
Pole pipe D1 negative poles.
Compared with prior art, the beneficial effects of the invention are as follows：Micro-wave oven variable-frequency power sources of the present invention uses single-chip microcomputer
Pic16f917 keeps output waveform undistorted, can handle various waveforms, such as square wave PWM, sine wave SPWM, space phasor
PWM, particular harmonic eliminate PWM, Hysteresis Current PWM etc.；Protection circuit is it is possible to additionally incorporate, is controlled using multiple triodes,
When short circuit or overload, metal-oxide-semiconductor VS D-S voltage across poles rises, as A point voltage UA=UD (UD is metal-oxide-semiconductor D pole tensions),
Diode D4 is turned on, and raises A points current potential, is overturn by VT2, VT3 interlock circuit constituted, VT5 is instantaneously turned on, turn off VS,
It is allowed to be effectively protected, while the output frequency of bridge inverter main circuit can also be changed by adjuster, reaches frequency conversion
Purpose.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of micro-wave oven variable-frequency power sources.
Fig. 2 is the circuit diagram of Voltage stabilizing module.
Fig. 3 is the circuit diagram of protection circuit in the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.
Refer in Fig. 1~3, the embodiment of the present invention, a kind of micro-wave oven variable-frequency power sources, including it is voltage reduction module, controller, whole
Flow filter circuit, Voltage stabilizing module, bridge inverter main circuit, protection circuit, filter circuit, adjuster and power circuit；The decompression
The input connection alternating current AC of module, the output end connection current rectifying and wave filtering circuit of voltage reduction module, the output of current rectifying and wave filtering circuit
The input of end connection Voltage stabilizing module, the output end connection bridge inverter main circuit of Voltage stabilizing module, alternating current AC also passes through power supply electricity
Road connects controller, protection circuit and adjuster respectively, and adjuster is also respectively connected with controller and bridge inverter main circuit, and bridge-type is inverse
Become circuit to use for it into micro-wave oven by filter circuit output voltage.
AC power AC can be obtained after voltage reduction module, then after single-phase bridge rectification and big capacitor filter on dc bus
Galvanic current pressure, the DC voltage is under the control of Voltage stabilizing module, after bridge inverter main circuit inversion, it is exportable by
The SPWM signals that adjuster is sent, after the single order Butterworth low pass ripple by one-level low capacity, you can obtained in output end
Obtain preferable sinewave output voltage signal.
Control system based on single-chip microcomputer pic16f917 is mainly used to produce the driving letter of inverter circuit switching device
Number, the output frequency of bridge inverter main circuit can be adjusted after adjuster, it is right that AT89S52 single-chip microcomputers control ADC0809 passes through
The sampling of DC bus-bar voltage, monitors and shows d-c bus voltage value, whole system is facilitated the operation of user in real time.
The physical circuit of Voltage stabilizing module is as shown in Fig. 2 in figure, triode V1, V2 are under the excitation of pumping signal, alternately
The on off state of enablement and disablement and cut-off-conducting is operated in, quickly, frequency is generally 50kHz or so, and this causes conversion speed
Switch triode V1, V2 power consumption very little, the efficiency of power supply can be significantly increased, and its efficiency can reach more than 80%.2、
Small volume, it is lightweight.It will be clear that not using bulky Industrial Frequency Transformer here from figure.Due on triode
After dissipated power is greatly lowered, larger fin is eliminated again.Due to these two aspects reason, so switching power supply
Small volume, it is lightweight.3rd, voltage stabilized range is wide.The output voltage of circuit is adjusted by the dutycycle of pumping signal, input letter
The change of number voltage by frequency modulation or can adjust width compensate, and so, when common frequency power network voltage change is larger, it is remained to
It is enough to ensure there is relatively stable output voltage.So the voltage stabilized range of Switching Power Supply is very wide, voltage regulation result is fine.Accounted in addition, changing
The method of empty ratio has two kinds of PWM-type and frequency modulation(PFM) type.So, switching power supply not only has voltage stabilized range wide
Advantage, and realize that the method for voltage stabilizing is also more, user can be according to the requirement of practical application, neatly from all kinds
Switching power supply.4th, the efficiency of filtering is greatly improved, and is greatly reduced the capacity and volume of filter capacitor.Switch voltage-stabilizing electricity
The working frequency in source is substantially operated in 50kHz at present, is 1000 times of linear stabilized power supply, this imitates the filtering after rectification
Rate almost also improves 1000 times.Exactly using capacitor filter is powered up after halfwave rectifier, efficiency also improves 500b times.In identical
Under ripple output voltage, during using switching power supply, the capacity of filter capacitor is filter capacitor in linear stabilized power supply
1/500-1/1000。
Protection circuit is as shown in figure 3, when control signal Vi is by low uprise, transistor VT1 is turned on, pulse transformer T lines
Voltage on circle L1 is the partial pressure value that power supply VCC is obtained on resistance R1, R2, and pulse transformer can be made very small, therefore very
In short time will saturation, the voltage being coupled on its L2 is a forward spike, and the spike turns on VT2, VT2, VT3
Two-stage positive feedback interlock circuit is constituted, because interlocked will be held on VT2, VT3, thus VT4 conductings turn on VS, work as control
Signal Vi processed by high level step-down when, pulse transformer T coil L1 magnetic recover, a negative sense spike is induced on L2, is made
VT2 ends, so that VT3, VT4 end, VT5 is instantaneously turned on, switch-off power VS.R8, D3, D4 are constituted certainly in circuit of the present invention
Protection driving, the current potential of A points is obtained by resistance R4, R5 partial pressure, and in normal work, VS drain potential is less than A point current potentials, because
And diode D4 ends, power supply VCC is through resistance R8, diode D3 to VS, when short circuit or overload, on VS D-S voltage across poles
Rise, as A point voltage UA=UD, (UD is metal-oxide-semiconductor D pole tensions), diode D4 conductings, raise A points current potential, by VT2, VT3 structure
Into interlock circuit upset, VT5 is instantaneously turned on, turn off VS, be allowed to be effectively protected.
Micro-wave oven variable-frequency power sources of the present invention keeps output waveform undistorted using single-chip microcomputer pic16f917, can handle each
Waveform is planted, such as square wave PWM, sine wave SPWM, space phasor PWM, particular harmonic eliminate PWM, Hysteresis Current PWM；Separately
Outer addition protection circuit, is controlled using multiple triodes, when short circuit or overload, on metal-oxide-semiconductor VS D-S voltage across poles
Rise, as A point voltage UA=UD, (UD is metal-oxide-semiconductor D pole tensions), diode D4 conductings, raise A points current potential, by VT2, VT3 structure
Into interlock circuit upset, VT5 is instantaneously turned on, turn off VS, be allowed to be effectively protected, while by adjuster can also change
Become the output frequency of bridge inverter main circuit, reach the purpose of frequency conversion.
Claims (7)
1. a kind of micro-wave oven variable-frequency power sources, including voltage reduction module, controller, current rectifying and wave filtering circuit, Voltage stabilizing module, bridge type inverse electricity
Road, protection circuit, filter circuit, adjuster and power circuit；Characterized in that, the input connection exchange of the voltage reduction module
Electric AC, the output end connection current rectifying and wave filtering circuit of voltage reduction module, the output end of current rectifying and wave filtering circuit connects the input of Voltage stabilizing module
End, the output end connection bridge inverter main circuit of Voltage stabilizing module, alternating current AC also connects controller, protection respectively by power circuit
Circuit and adjuster, adjuster are also respectively connected with controller and bridge inverter main circuit, and bridge inverter main circuit is defeated by filter circuit
Go out voltage to use for it into micro-wave oven.
2. micro-wave oven variable-frequency power sources according to claim 1, it is characterised in that the voltage reduction module is step-down transformer.
3. micro-wave oven variable-frequency power sources according to claim 1, it is characterised in that the controller uses single-chip microcomputer
pic16f917。
4. micro-wave oven variable-frequency power sources according to claim 1, it is characterised in that the mu balanced circuit includes chip IC 1, three
Pole pipe V1, inductance L1 and diode D1, it is characterised in that the connection resistance of pin 5 R5, resistance R6, the power supply of the chip IC 1
VCC and triode V2 emitter stage, the connection of pin 3 the resistance R1, resistance R1 of chip IC 1 other end connection resistance R2, resistance
R3 and electric capacity C1, resistance R2 other end connection resistance R4 and the pin 4 of chip IC 1, resistance R5 other end connecting triode
V1 base stage and the pin 8 of chip IC 1, triode V1 emitter stage connecting triode V2 base stage and the resistance R6 other end,
Triode V1 colelctor electrode connecting triode V2 colelctor electrode, the resistance R4 other end, diode D1 negative electrode and inductance L1, core
The piece IC1 connection resistance R7 of pin 7 and the pin 9 of chip IC 1, resistance R7 other end connection electric capacity C2, inductance L1 it is another
End, the pin 6 and output voltage U1 of the pin 2 of chip IC 1, chip IC 1.
5. micro-wave oven variable-frequency power sources according to claim 4, it is characterised in that the model μ A723 of the chip IC 1.
6. micro-wave oven variable-frequency power sources according to claim 4, it is characterised in that the triode V1 and V2 is p-type three
Pole pipe.
7. micro-wave oven variable-frequency power sources according to claim 4, it is characterised in that the protection circuit include triode VT1,
Transformer T, resistance R1, diode D1 and metal-oxide-semiconductor VS, described resistance R1 one end connect power supply VCC, triode VT2 transmitting respectively
Pole, resistance R3, resistance R8 and triode VT4 colelctor electrodes, the resistance R1 other ends connect resistance R2 and transformer T coil L1 respectively,
The transformer T coil L1 other ends connect the resistance R2 other ends and triode VT1 colelctor electrodes respectively, triode VT1 grounded emitters,
Triode VT1 base stage connection control signal Vi, transformer T coil L2 one end connects grounding resistance R5, resistance R4 and three poles respectively
Pipe VT3 base stages, it is negative that triode VT3 emitter stages connect grounding resistance R6, the transformer T coil L2 other ends and diode D4 respectively
Pole, diode D4 positive poles connect the resistance R8 other ends and diode D3 positive poles respectively, and diode D3 negative poles connect output end respectively
Vo and metal-oxide-semiconductor VS D poles, metal-oxide-semiconductor VS S poles are distinguished connecting triode VT5 colelctor electrodes and resistance R9 and are grounded, and resistance R9 is another
Connecting triode VT5 base stages, triode VT4 base stages and resistance R7, triode VT4 emitter stage distinguish connecting triode respectively at end
The G poles of VT5 emitter stages and metal-oxide-semiconductor VS, the resistance R7 other ends connect the resistance R4 other ends, diode D1 positive poles and triode respectively
VT2 colelctor electrodes, triode VT2 base stages connect the resistance R3 other ends and diode D2 positive poles respectively, and diode D2 negative poles connect respectively
Connect triode VT3 colelctor electrodes and diode D1 negative poles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710548979.XA CN107134932A (en) | 2017-07-07 | 2017-07-07 | A kind of micro-wave oven variable-frequency power sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710548979.XA CN107134932A (en) | 2017-07-07 | 2017-07-07 | A kind of micro-wave oven variable-frequency power sources |
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| Publication Number | Publication Date |
|---|---|
| CN107134932A true CN107134932A (en) | 2017-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710548979.XA Withdrawn CN107134932A (en) | 2017-07-07 | 2017-07-07 | A kind of micro-wave oven variable-frequency power sources |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809110A (en) * | 2018-06-13 | 2018-11-13 | 湖南图强科技开发有限公司 | A kind of power supply system of adjustable frequency |
-
2017
- 2017-07-07 CN CN201710548979.XA patent/CN107134932A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809110A (en) * | 2018-06-13 | 2018-11-13 | 湖南图强科技开发有限公司 | A kind of power supply system of adjustable frequency |
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Application publication date: 20170905 |