CN111212491B - Filament current control device of variable-frequency microwave generating source - Google Patents
Filament current control device of variable-frequency microwave generating source Download PDFInfo
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- CN111212491B CN111212491B CN202010104871.3A CN202010104871A CN111212491B CN 111212491 B CN111212491 B CN 111212491B CN 202010104871 A CN202010104871 A CN 202010104871A CN 111212491 B CN111212491 B CN 111212491B
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- 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
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Abstract
The invention discloses a filament current control device of a variable frequency microwave generating source, which relates to the technical field of variable frequency microwave power supplies and comprises the following components: the high-voltage isolation driving circuit comprises a field effect tube, a first diode, a high-voltage isolation driving module and a microwave frequency conversion circuit; the high-voltage isolation driving module is connected with the field effect transistor and is used for controlling the switching on and off of the field effect transistor; the microwave frequency conversion circuit comprises a magnetron and a filament winding unit of a main transformer; the field effect tube and the first diode are connected in series to form a series branch, and the series branch is connected with the filament winding unit in parallel; the filament winding unit is connected with the magnetron, and the field effect tube is used for adjusting the current at two ends of the filament in the magnetron; the filament winding unit is an output winding of the main transformer. The device provided by the invention can realize the quick start of the magnetron.
Description
Technical Field
The invention relates to the technical field of variable-frequency microwave power supplies, in particular to a filament current control device of a variable-frequency microwave generating source.
Background
The high-power microwave variable frequency power supply with the power of more than 1.5KW is a power supply which is designed at the high-voltage end of the cathode and independently supplies power to the filament so as to flexibly control the current of the filament, and the current of the filament can be conveniently adjusted.
In order to save cost and compact structure, the filament power supply is taken from one winding of a cathode high-voltage transformer, namely two windings are arranged on the secondary side of the high-voltage transformer, one winding provides high voltage for a cathode, and the other winding provides power for the filament, so that the inherent deficiency of the low-power microwave variable-frequency power supply is caused: when the magnetron is started, in order to quickly heat the filament and reach the temperature of emitted electrons, the power output of the transformer needs to be increased to provide enough current for the filament, and at the moment, the magnetron is not started, the high voltage of the cathode is equivalent to an open circuit, so that the high voltage output is very high, even close to the breakdown voltage of the magnetron, and the magnetron is damaged once when being started each time; when the magnetron is started, the situation of too small filament current can occur after long-time work, and the magnetron is magnetically controlled after workThe tube will generate heat, even if cooling measures are taken, the outer surface temperature of the magnetron still reaches more than eight ninety degrees, the impedance characteristic is a negative temperature characteristic, the higher the temperature of the magnetron is, the lower the impedance is, in order to keep the power of the magnetron constant, U is set according to the power formula P2And Z, when Z is smaller, the frequency of the variable frequency power supply needs to be increased, the internal resistance of the main transformer is increased, the high-voltage output is reduced, namely U is reduced to keep the power unchanged, because the high voltage and the filament power supply are wound on one transformer, the power supply reduces the output of U, the filament current is passively reduced, thus the cathode impedance is gradually reduced along with the long-time work of the magnetron, the temperature of the magnetron slowly and continuously rises, the internal resistance of the main transformer is controlled by the variable frequency power supply to be continuously increased, the output voltage is reduced, the filament current is continuously and passively reduced, the generated cathode temperature can be reduced to the critical state of emitting electrons, the electron emission is discontinuous, the microwave output is changed from continuous waves to discontinuous waves, and even the fault phenomena such as mode.
Disclosure of Invention
The invention aims to provide a filament current control device of a variable-frequency microwave generating source, which is used for realizing the quick start of a magnetron and stabilizing the filament current after the magnetron is started.
In order to achieve the purpose, the invention provides the following scheme:
a variable frequency microwave generating source filament current control device comprising: the high-voltage isolation driving circuit comprises a field effect tube, a first diode, a high-voltage isolation driving module and a microwave frequency conversion circuit;
the high-voltage isolation driving module is connected with the field effect tube and is used for controlling the switching on and off of the field effect tube;
the microwave frequency conversion circuit comprises a magnetron and a filament winding unit of a main transformer; the field effect tube and the first diode are connected in series to form a series branch, and the series branch is connected with the filament winding unit in parallel; the filament winding unit is connected with the magnetron, and the field effect tube is used for adjusting the filament current in the magnetron; the filament winding unit is an output winding of the main transformer.
Optionally, the first diode is a schottky diode.
Optionally, the high-voltage isolation driving module is provided with a first input end, a second input end, a third input end, a first output end and a second output end; the first output end is connected with the grid electrode of the field effect transistor; the second output end is connected with the source electrode of the field effect transistor; the first input end is a filament current control end; the second input end is a power supply input end of the high-voltage isolation driving module; the third input end is a ground end.
Optionally, the filament winding unit is provided with a first filament winding subunit, a second filament winding subunit and a third filament winding subunit;
the input end of the first filament winding subunit, the input end of the second filament winding subunit and the input end of the third filament winding subunit are connected together through a filament winding; a source electrode of the field effect transistor is connected with one end of the first diode to form a series branch; after the series branch is respectively connected with the first filament winding subunit and the second filament winding subunit in parallel, the other end of the first diode, the output end of the first filament winding subunit and the output end of the second filament winding subunit are connected into a common output end, and the common output end is connected with one end of a filament of the magnetron; and the output end of the third filament winding subunit is connected with the other end of the filament of the magnetron and the cathode.
Optionally, the first filament winding subunit includes an inductor and a second diode connected in series with the inductor; one end of the inductor is the input end of the first filament winding subunit, the other end of the inductor is connected with one end of the second diode, and the other end of the second diode is the output end of the first filament winding subunit.
Optionally, the second filament winding subunit is a third diode.
Optionally, the microwave frequency conversion circuit further includes an input winding and a cathode high-voltage winding; the input winding is an input winding of the main transformer; and the cathode high-voltage winding is an output winding of the main transformer.
Optionally, the microwave frequency conversion circuit further includes a voltage-multiplying rectification module, and the voltage-multiplying rectification module is connected to the cathode high-voltage winding.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a filament current control device of a variable frequency microwave generating source, wherein a filament winding unit is connected with a field effect tube in parallel, and the field effect tube is controlled to be switched on and off through a high-voltage isolation driving module, so that the current in a filament is adjusted, the problem of difficult starting of a magnetron is solved, the filament current is stabilized, and the microwave emission of the magnetron is ensured to be stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a filament current control device of a variable frequency microwave generating source according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a high-voltage isolation driving module of a filament current control device of a variable-frequency microwave generating source in the embodiment of the invention.
Description of the symbols:
q7-field effect transistor; d012-a first diode; d08 — second diode; d09 — third diode; an L-inductor; r010-fixed load; t1-main transformer; 1-a first input; 2-a second input; 3-a third input; 4-a first output; 5-a second output; 6-a first filament winding subunit; 7-a second filament winding subunit; 8-a third filament winding subunit; 9-cathode high voltage winding; 10-input winding.
Detailed Description
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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The invention aims to provide a filament current control device of a variable-frequency microwave generating source, which is used for realizing the quick start of a magnetron and stabilizing the filament current after the magnetron is started.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a variable frequency microwave generating source filament current control device includes: the device comprises a field effect transistor Q7, a high-voltage isolation driving module and a microwave frequency conversion circuit; wherein, microwave frequency conversion circuit is prior art.
The high-voltage isolation driving module is connected with the field-effect tube Q7 and is used for controlling the on and off of the field-effect tube Q7;
the microwave frequency conversion circuit comprises a magnetron and a filament winding unit of a main transformer T1; the field effect tube Q7 and the first diode D012 are connected in series to form a series branch, and the series branch is connected with the filament winding unit in parallel; the filament winding unit is connected with the magnetron, and the field effect tube Q7 is used for adjusting the current in the filament inside the magnetron; wherein, the filament winding unit is an output winding of the main transformer T1. The microwave frequency conversion circuit also comprises other control circuits and a main circuit, which are all in the prior art.
In addition, the field effect transistor Q7 is connected in series with the first diode D012 and then connected in parallel with the filament winding unit, the high-voltage isolation driving module controls the field effect transistor Q7 to be switched on and off, different voltage drops at two ends of the first filament winding subunit are obtained by using different duty ratios, so that the voltages at two ends of the filament are adjusted, and the current in the filament is changed, wherein the high-voltage isolation driving module is provided with a first input end 1, a second input end 2, a third input end 3, a first output end 4 and a second output end 5; the first output terminal 4 is connected with the grid of a field effect transistor Q7; the second output end 5 is connected with the source electrode of the field effect transistor Q7; the first input end 1 is a filament current control end; the second input end 2 is a power supply input end of the high-voltage isolation driving module; the third input terminal 3 is a ground terminal. The first input end 1 is connected with an external filament voltage control circuit.
In addition, the filament winding unit is provided with a first filament winding subunit 6, a second filament winding subunit 7 and a third filament winding subunit 8.
The input end of the first filament winding subunit 6, the input end of the second filament winding subunit 7 and the input end of the third filament winding subunit 8 are connected together through a filament winding; the source electrode of the field effect transistor Q7 is connected with one end of a first diode D012 to form a series branch; after the series branch is respectively connected with the first filament winding subunit 6 and the second filament winding subunit 7 in parallel, the other end of the first diode D012, the output end of the first filament winding subunit 6 and the output end of the second filament winding subunit 7 are connected into a common output end, and the common output end is connected with one end of a filament of a magnetron; the output end of the third filament winding subunit 8 is connected with the other end of the filament of the magnetron and the cathode.
Preferably, the first filament winding subunit 6 comprises an inductance L and a second diode D08 in series with the inductance L; one end of the inductor L is an input end of the first filament winding subunit 6, the other end of the inductor L is connected to one end of the second diode D08, and the other end of the second diode D08 is an output end of the first filament winding subunit 6.
As a possible embodiment, the second filament winding subunit 7 is a third diode D09.
Further, the microwave frequency conversion circuit also comprises an input winding 10 and a cathode high-voltage winding 9; the input winding 10 is the input winding 10 of the main transformer T1; the cathode high voltage winding 9 is the output winding of main transformer T1.
In order to realize the cathode high-voltage power supply, the microwave frequency conversion circuit further comprises a voltage-multiplying rectifying module, and the voltage-multiplying rectifying module is connected with the cathode high-voltage winding 9.
Preferably, the high-voltage isolation driving module is used for safely transmitting a control signal of a low-voltage end to a cathode high-voltage end to realize control of the field effect transistor Q7. The invention provides an implementable circuit, which can realize the effect of a high-voltage isolation driving module by various circuits, and specifically comprises the following components:
as shown in fig. 2, the high-voltage isolation driving module includes a high-voltage isolation optocoupler U1 and a high-voltage isolation DC-DCU 2; the high-voltage isolation optocoupler U1 comprises a fourth diode and a phototriode; the anode of the fourth diode forms a first input terminal 1 via a first resistor R1; the emitter of the phototriode forms a first output terminal 4 and a second output terminal 5 through a third resistor R3; namely, the emitter of the phototriode is respectively connected with the gate and the source of the field effect transistor Q7 through a third resistor R3. The emitter of the phototransistor is also connected to ground via a second resistor R2. The model of the high-voltage isolation optocoupler is CNY 64.
One end of the high voltage isolation DC-DCU2 is connected to a power supply and the other end forms a second input terminal 2. The high-voltage isolation DC-DCU2 is an isolation power supply module, and the model of the high-voltage isolation DC-DCU2 is B1212S-1W.
The high-voltage isolation driving module also reserves a third input end 3, namely a grounding end. In order to meet practical requirements, the first diode D012, the second diode D08, and the third diode D09 are schottky diodes.
In addition, the negative terminal of the voltage-doubling rectifying module is connected to one end of the filament and the cathode inside the magnetron through the third filament winding subunit 8 of the filament winding unit. The positive end of the voltage-multiplying rectifying module is grounded.
The microwave frequency conversion circuit is also provided with a fixed load R010, one end of the fixed load R010 is connected with a common output end which is formed by connecting the output end of the first filament winding subunit 6 and the output end of the second filament winding subunit 7 after being connected with the source electrode of the field effect transistor Q7 and the first diode D012 in series; the other end of the fixed load R010 is connected to the output of the third filament winding subunit 8. The fixed load R010 has the function of preventing the open circuit of the connection circuit between the filament power supply and the magnetron from forming no load, which causes the output voltage to be too high to break down the second diode D08 and the third diode D09.
When the device provided by the invention is started, the filament current control circuit outputs a strong signal, the high-voltage isolation driving module is controlled to output a high duty ratio, the field-effect tube is switched on, the voltage drop at two ends of the first filament winding subunit is reduced, the filament current is increased by increasing the filament voltage, the temperature of the filament is accelerated, and the cathode of the magnetron rapidly reaches the state of emitting electrons, so that the time is reduced by at least 2S compared with the prior art, when the magnetron enters the normal working state, the filament voltage control circuit outputs a zero signal, the high-voltage isolation driving module is controlled to output the duty ratio to be zero, the field-effect tube is switched off, the voltage drop at two ends of the first filament winding subunit is increased, the filament voltage is reduced, the filament. In the prior art, after a magnetron works for a long time, the frequency of the variable frequency power supply is adjusted to be increased according to PID so as to limit the high voltage of the cathode of the magnetron, when the variable frequency power supply reaches a certain frequency, the filament is not supplied with power enough to cause discontinuity of emitted electrons of the cathode of the magnetron, which is a serious leak of the current variable frequency microwave power supply technology, and the problem that the circuit cannot be compensated without upgrading is solved. The filament current control circuit outputs a proper signal which is processed by a certain algorithm, controls the high-voltage isolation driving module to output a proper duty ratio, turns on the field effect transistor, properly reduces the voltage drop at two ends of the first filament winding subunit, improves the filament voltage to improve the filament current, and maintains the state that the filament temperature can sufficiently reach the state that the cathode continuously emits electrons.
Principle of adjusting filament current: the point B current is the filament current. The impedance Zab from point A to point B is equal to the impedance of the first filament winding unit after the field effect tube Q7 is connected in series with the first diode D012. The on-off proportion of the field effect transistor Q7 is adjusted, the effective impedance of the field effect transistor Q7 is adjusted, the impedance Zab from the point A to the point B is adjusted, and under the condition that the filament winding voltage of the main transformer T1 is the same (the influence of the filament winding internal resistance is ignored because the filament winding internal resistance is very small and is less than 0.01 ohm), the total current sum from the point A to the point B is finally changed due to the change of the impedance Zab from the point A to the point B.
The filament power supply and the cathode high-voltage power supply share the same transformer, the advantages of compact structure and economy of a general method are kept, the filament power supply source is not changed, and the problems of power supply volume increase and cost increase caused by the fact that high-voltage isolation is needed for adjusting filament current to supply power to the filament independently are solved. And the current of the filament can be flexibly controlled, so that the filament can provide enough heat to keep the cathode in the optimal electron emission state all the time.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a frequency conversion microwave generation source filament current controlling means which characterized in that, frequency conversion microwave generation source filament current controlling means includes: the high-voltage isolation driving circuit comprises a field effect tube, a first diode, a high-voltage isolation driving module and a microwave frequency conversion circuit;
the high-voltage isolation driving module is connected with the field effect tube and is used for controlling the switching on and off of the field effect tube; the high-voltage isolation driving module comprises a high-voltage isolation optocoupler and a high-voltage isolation; the high-voltage isolation optocoupler comprises a fourth diode and a phototriode; the anode of the fourth diode forms a first input end through a first resistor; the emitter of the phototriode forms a first output end and a second output end through a third resistor; the emitter of the phototriode is grounded through a second resistor; one end of the high-voltage isolator is connected with a power supply, and the other end of the high-voltage isolator forms a second input end;
the microwave frequency conversion circuit comprises a magnetron and a filament winding unit of a main transformer; the field effect tube and the first diode are connected in series to form a series branch, and the series branch is connected with the filament winding unit in parallel; the filament winding unit is connected with the magnetron, and the field effect tube is used for adjusting the current at two ends of a filament in the magnetron; the filament winding unit is an output winding of the main transformer.
2. The variable frequency microwave generating source filament current control device of claim 1 wherein the first diode is a schottky diode.
3. The variable frequency microwave generating source filament current control device of claim 1, wherein the high voltage isolated driving module is provided with a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal; the first output end is connected with the grid electrode of the field effect transistor; the second output end is connected with the source electrode of the field effect transistor; the first input end is a filament current control end; the second input end is a power supply input end of the high-voltage isolation driving module; the third input end is a ground end.
4. The variable-frequency microwave generating source filament current control device according to claim 1, wherein the filament winding unit is provided with a first filament winding subunit, a second filament winding subunit, and a third filament winding subunit;
the input end of the first filament winding subunit, the input end of the second filament winding subunit and the input end of the third filament winding subunit are connected together through a filament winding; a source electrode of the field effect transistor is connected with one end of the first diode to form a series branch; after the series branch is respectively connected with the first filament winding subunit and the second filament winding subunit in parallel, the other end of the first diode, the output end of the first filament winding subunit and the output end of the second filament winding subunit are connected into a common output end, and the common output end is connected with one end of a filament of the magnetron; and the output end of the third filament winding subunit is connected with the other end of the filament of the magnetron and the cathode.
5. The variable frequency microwave generating source filament current control device of claim 4 wherein the first filament winding subunit includes an inductor and a second diode in series with the inductor; one end of the inductor is the input end of the first filament winding subunit, the other end of the inductor is connected with one end of the second diode, and the other end of the second diode is the output end of the first filament winding subunit.
6. The variable frequency microwave generating source filament current control device of claim 4 wherein the second filament winding subunit is a third diode.
7. The variable frequency microwave generating source filament current control device of claim 1, wherein the microwave variable frequency circuit further comprises an input winding and a cathode high voltage winding; the input winding is an input winding of the main transformer; and the cathode high-voltage winding is an output winding of the main transformer.
8. The variable frequency microwave generating source filament current control device of claim 7, wherein the microwave variable frequency circuit further comprises a voltage doubler rectifier module, the voltage doubler rectifier module being connected to the cathode high voltage winding.
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| CN202010104871.3A CN111212491B (en) | 2020-02-20 | 2020-02-20 | Filament current control device of variable-frequency microwave generating source |
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| CN202010104871.3A CN111212491B (en) | 2020-02-20 | 2020-02-20 | Filament current control device of variable-frequency microwave generating source |
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| JPH01267994A (en) * | 1988-04-20 | 1989-10-25 | Mitsubishi Electric Corp | High frequency heating cooking apparatus |
| US4882666A (en) * | 1989-03-23 | 1989-11-21 | North American Philips Corporation | High frequency high voltage power supply with controlled output power |
| CN204217152U (en) * | 2014-06-09 | 2015-03-18 | 青岛东方循环能源有限公司 | A kind of magnetron heater voltage auto-adjusting circuit |
| CN107770891A (en) * | 2017-10-25 | 2018-03-06 | 广东美的厨房电器制造有限公司 | Magnetron heater control circuit, magnetron power supply circuit |
| CN208241932U (en) * | 2018-05-07 | 2018-12-14 | 湖南中谷科技股份有限公司 | A kind of inverter circuit applied to automatic vending machine microwave heating system |
Family Cites Families (4)
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| CN2722497Y (en) * | 2004-06-09 | 2005-08-31 | 海尔集团公司 | Operating power supply of magnetron for micro-oven |
| CN101106846B (en) * | 2006-09-13 | 2011-09-21 | 阮世良 | A driving power and control method for magnetic control tube |
| CN206671864U (en) * | 2017-03-30 | 2017-11-24 | 西京学院 | A kind of microwave machine control system based on virtual instrument |
| CN209627777U (en) * | 2018-12-25 | 2019-11-12 | 洪国慧 | A kind of filament current control circuit |
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2020
- 2020-02-20 CN CN202010104871.3A patent/CN111212491B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01267994A (en) * | 1988-04-20 | 1989-10-25 | Mitsubishi Electric Corp | High frequency heating cooking apparatus |
| US4882666A (en) * | 1989-03-23 | 1989-11-21 | North American Philips Corporation | High frequency high voltage power supply with controlled output power |
| CN204217152U (en) * | 2014-06-09 | 2015-03-18 | 青岛东方循环能源有限公司 | A kind of magnetron heater voltage auto-adjusting circuit |
| CN107770891A (en) * | 2017-10-25 | 2018-03-06 | 广东美的厨房电器制造有限公司 | Magnetron heater control circuit, magnetron power supply circuit |
| CN208241932U (en) * | 2018-05-07 | 2018-12-14 | 湖南中谷科技股份有限公司 | A kind of inverter circuit applied to automatic vending machine microwave heating system |
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