CN101106846A - A driving power and control method for magnetic control tube - Google Patents
A driving power and control method for magnetic control tube Download PDFInfo
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- CN101106846A CN101106846A CNA2006100625959A CN200610062595A CN101106846A CN 101106846 A CN101106846 A CN 101106846A CN A2006100625959 A CNA2006100625959 A CN A2006100625959A CN 200610062595 A CN200610062595 A CN 200610062595A CN 101106846 A CN101106846 A CN 101106846A
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Abstract
The invention discloses a solenoid drive power supply and its control method. The power supply includes a power supply terminal, a high voltage circuit connected with the power supply terminal, a first logic control circuit for performing control drive on the high voltage circuit, a filament circuit with an input end connected with the power supply terminal, and a second logic control circuit for performing control drive on the filament circuit. The method includes: for high voltage power part, adopting frequency conversion control, regulating inputting power by regulating on-off frequency, and ensuring output power be stable via voltage feedforward when input voltage changes; and for the filament circuit, adopting semibridge circuit or single transistor circuit in which on time of one switch transistor of the semibridge circuit is stable and on time of the other switch transistor changes along with the feed, and off time of the switch transistor of the single transistor circuit is determined by a main circuit and on time is controlled by the feed. By adopting a technology of separating the filament circuit and the high voltage circuit, the invention has high adaptability on solenoid.
Description
Technical field
The present invention relates to the power conversion technology, relate in particular to a kind of high frequency switch power and control method thereof to the magnetron power supply.
Background technology
The present invention relates to a kind of magnetron drive power supply, traditional magnetron drive power supply is that Industrial Frequency Transformer drives, and its power is out of contior, has also wasted ample resources simultaneously.Adopt the Switching Power Supply power supply can only adopt time break-make control, realize power adjustments the control of microwave power.Utilize high frequency switch power that the scheme of magnetron power supply is had much for many years, the patent No. as MAT's application is the magnetron drive power supply patent of CN98802817.4, as shown in Figure 1, this patent power supply adopt heater chain and high-tension circuit integrated scheme, promptly in the high voltage supply process of magnetron, filament supply and high voltage source all adopt same transformer-supplied, and its control is adopted and decided service time, becomes the mode power controlling of turn-off time.Though this method can realize power adjustments, but there are the following problems: 1, two switching tube stress differences, 2, output diode stress difference, particularly when the heater chain loose contact, there is the danger of over-voltage breakdown in the output high-voltage diode when high-tension circuit loose contact or open circuit; 3, power regulating range limited (in the reality 50%～100% range regulation).4, Zui Da problem, because high-tension circuit and heater chain are integrated, this power requirement magnetron heater circuit induction reactance is less, the variation of heater current within the range of permission when carrying out variable frequency control with assurance, make the variable frequency power supply of Panasonic can only adopt the high frequency magnetron magnetron of heater chain (or optimized specially) of Panasonic, so just the application to Switching Power Supply has caused obstacle, has hindered the development in market.
Summary of the invention
The object of the present invention is to provide a kind of magnetron drive power supply and control method, thereby realize the adjusting of magnetron input power, can be applicable to the magnetron of different manufacturers or type.
Realize that technical scheme of the present invention is:
A kind of magnetron drive power supply, comprise power end, the high-tension circuit that is connected with power end, high-tension circuit is carried out first logic control circuit of controlling and driving, it is characterized in that: also comprise heater chain, its input is connected with described power end, and comprises second logic control circuit that heater chain is carried out controlling and driving.
The present invention further comprises: described high-tension circuit comprises in turn current rectifying and wave filtering circuit and the switching tube branch road that connects, and the resonance branch road that comprises the former limit of transformer that is in parallel with described switching tube branch road, the secondary output of transformer.
The present invention further comprises: described switching tube branch road comprises first switching tube, second switch pipe and the current sampling resistor that connects in turn; The former limit of transformer is in parallel with the second switch pipe become the resonance branch road with capacitances in series after; Perhaps described switching tube branch road comprises the bridge-type connecting circuit that is made of four switching tubes, and wherein the 6th switching tube, the 9th switching tube are connected into first switching branches, and the 7th switching tube, the 8th switching tube are connected into the second switch branch road; Described resonance branch road is connected between the tie point of the tie point of the 7th, eight liang of switching tube and the 6th, nine liang of switching tube.
The present invention further comprises: described resonance branch road comprises former limit of transformer and the resonant capacitance that connects in turn, and described resonant capacitance is connected in the high-pressure side or the low-pressure end on the former limit of described transformer or is connected high-pressure side and low-pressure end simultaneously; Described transformer comprises at least one former limit and secondary or two the former limits of polyphone and the secondary that is connected in parallel to each other each other.
The present invention further comprises: described transformer secondary output circuit comprises: the negative electrode of the 4th diode is connected with the anode of the 3rd diode; The anode output of the negative electrode of the 3rd diode and the 4th diode; Be connected in the two ends of the 3rd diode and the 4th diode after the 3rd electric capacity and the 4th capacitances in series; Transformer secondary one end links to each other with the tie point of two diodes, and the other end links to each other with the tie point of two electric capacity; Perhaps
Described transformer secondary output circuit comprises: electric capacity is with in parallel with the transformer secondary after the anode of diode connects into series arm in turn; The negative electrode of diode and anode are two outputs.
The present invention further comprises: described heater chain is the half-bridge resonance circuit, comprise the switching tube branch road that connects in turn by the 3rd switching tube, the 4th switching tube and resistance, the former limit of transformer and electric capacity are in parallel with the 4th switching tube after connecting into the resonance branch road, the secondary output of transformer.
The present invention further comprises: described heater chain is the single tube resonant circuit, comprise the switching tube branch road that single switching transistor (Q5) is formed, the former limit (L5) of transformer be connected the secondary output of transformer after electric capacity (C5) connects into the resonance branch road with switching tube (Q5).
The control method of magnetron drive power supply of the present invention, its high-tension circuit controlling features is a variable frequency control, and power output was big when switching frequency was low, and power output was little when switching frequency was high; Described control circuit detects input current and input voltage, carries out feedback regulation, and power output is stable when changing within the specific limits with the control input voltage, thereby realizes that microwave output power is stable.
A kind of control method of magnetron drive power supply, it is characterized in that: fix for switching tube service time in the described heater chain, another switching tube service time changes with feedback, by given variation, in a switch periods, increase service time can realize having bigger electric current to heat when magnetron starts; In a switch periods,, can realize that magnetron is with less constant current operate as normal by shortening switching tube service time.
A kind of control method of magnetron single tube filament drive, it is characterized in that: the switching tube turn-off time is determined by main circuit parameter, service time is by the feedback decision, by given variation, increasing service time realization magnetron in a switch periods has bigger electric current to heat, by shortening switching tube service time, guarantee that magnetron is with less constant current operate as normal.
The scheme that the present invention adopts heater chain and high-tension circuit to separate; magnetron there is very strong adaptive capacity; can be adapted to the magnetron of different manufacturers; except very strong adaptability, by suitable logic and control, separately scheme is compared former scheme a lot of benefits; as realizing the too small protection of heater current; high pressure output over-voltage protections etc., the overvoltage in the time of particularly can preventing to start shooting improves reliability.
Description of drawings
Fig. 1 is Panasonic's integrated power supply scheme schematic diagram in the prior art.
Fig. 2 is a high-tension circuit schematic diagram of the present invention;
Fig. 3 is the control characteristic of LLC circuit;
Fig. 4 is a high-pressure section LLC schematic diagram;
Fig. 5 is switching frequency switching tube VCE waveform during greater than resonance frequency;
Fig. 6 is switching frequency magnetron cathode current waveform during less than resonance frequency;
Fig. 7 is a high-pressure section control principle block diagram;
Fig. 8 is an input current waveform;
Fig. 9 is an output diode single tube voltage-multiplying circuit schematic diagram;
Figure 10 is resonant capacitance connection circuit cathode circuit figure;
Figure 11 is the circuit diagram of resonant capacitance difference connection circuit positive pole and negative pole;
Figure 12 adopts the circuit diagram of two transformers for half-bridge resonance;
Figure 13 adopts full-bridge resonance manner circuit diagram for high-pressure section;
Figure 14 adopts the another embodiment circuit diagram of full-bridge resonance manner for high-pressure section;
The half-bridge resonance circuit diagram that Figure 15 adopts for heater chain;
Figure 16 adopts single tube resonant circuit figure for heater chain.
Embodiment
The present invention is further elaborated below in conjunction with the drawings and specific embodiments:
Basic ideas of the present invention are: magnetron drive power supply, comprise heater chain and high-tension circuit, and adopt independently power supply respectively; Wherein high-tension circuit adopts the LLC controlled resonant converter, specifically can adopt full-bridge resonance or half-bridge resonance; Can also increase high-voltage power by the connected mode that changes transformer.Heater chain can adopt the mode of half-bridge resonance or single tube resonance, and half-bridge resonance is by the adjusting of by-pass cock frequency realization to electric current, and the single tube scheme is controlled heater current by regulating service time, specifically sees embodiment.
As shown in Figure 2, circuit of the present invention is divided into heater chain, logic control circuit, high-tension circuit three parts.Wherein logic control circuit guarantees that mainly heater current is little, realizes the high pressure overvoltage, the switching tube overcurrent, and defencive functions such as radiator excess temperature, no longer superfluous here chatting, emphasis is set forth the operation principle of high-tension circuit and heater chain.As shown in the figure, high-tension circuit adopts the LLC controlled resonant converter, its main circuit is characterized as the interchange of input or direct current after rectifier bridge 101 rectifications, after inductance L 1 and capacitor C 1 filtering, export, the feature of this filter circuit is that wherein capacitor C 1 does not adopt big electrochemical capacitor to carry out flat ripple to handle, therefore with common converter bigger difference is arranged, if for exchanging input, filtered voltage is the pulsating wave after the rectification.Filtered voltage is supplied with half bridge resonant transformer, and for dwindling the volume of converter, resonant inductance can be integrated in the transformer, utilize transformer leakage inductance as resonant inductance, there is air gap on the former limit of transformer simultaneously, so magnetizing inductance is less, and this controlled resonant converter is a LLC converter.Physical circuit comprises the first switching tube Q1, the second switch pipe Q2 that connects in turn, current sampling resistor R, and the former limit L2 of transformer and capacitor C 2 are in parallel with second switch pipe Q2 after being connected into the resonance branch road.
The transformer secondary circuit is as follows: the negative electrode of the 4th diode D4 is connected with the anode of the 3rd diode D3; The negative electrode of the 3rd diode D3 connects the anode of magnetron; The anode of the 4th diode D4 connects the negative electrode (glower end) of magnetron; Be connected in the two ends of the 3rd diode D3 and the 4th diode D4 after the 3rd capacitor C 3 and 4 series connection of the 4th capacitor C.Transformer secondary one end links to each other with the tie point of two diodes, and the other end links to each other with the tie point of two electric capacity.
As shown in Figures 2 and 3, high-tension circuit adopts variable frequency control.Power output is little when switching frequency is high, and power output is big when switching frequency is low, and switching tube can realize that no-voltage is open-minded in the switching frequency scope, and when switching frequency was lower than resonance frequency, output diode can be realized zero-current switching.The LLC converter has good performance, can realize that former limit switching tube no-voltage in gamut is open-minded, and the secondary diode can improve the efficient of converter like this at switching frequency zero-current switching during less than resonance frequency, improves the EMI performance simultaneously.
Logic control circuit sampling primary current carries out FEEDBACK CONTROL, and the sampling input voltage, the permanent power control of importing, control circuit is according to operation result, the switching frequency of the switching tube of control half-bridge resonance, thus microwave output power is regulated in the control of realization input power.Because the input filtering circuit do not adopt big electrochemical capacitor filtering, and adopts suitable control, so circuit can realize higher power factor input, improves circuit reliability simultaneously, reduces cost.
High-tension circuit part equivalent schematic diagram as shown in Figure 4.Be volume that reduces converter and the isolation that realizes former secondary, transformer adopting is divided the method for groove coiling in this circuit, there is big leakage inductance in therefore former secondary, this leakage inductance participates in circuit working as the resonant inductance of circuit, there is air gap on the former limit of transformer simultaneously, therefore the collection magnetoelectricity sense of former limit is less, so this transformer has been realized the function of integrated leakage inductance and magnetizing inductance.The resonant inductance of half bridge resonant transformer can adopt transformer leakage inductance L2 to realize, the less magnetizing inductance L3 that the former limit of while transformer air gap causes also participates in the work of circuit.
Fig. 5 is switching frequency switching tube both end voltage and drive waveforms when being higher than resonance frequency, and wherein Vds is switching tube D, S two ends waveform, Vgs is a drive waveforms, visible when when the Vgs driving voltage uprises from scheming, switching tube both end voltage Vds is step-down, and switching tube is a zero voltage switch at this moment.Fig. 6 is switching frequency magnetron cathode current waveform when being lower than resonance frequency, and from scheming as seen, the secondary diode can be realized zero-current switching, and same this moment, former limit switching tube can realize that no-voltage is open-minded.
Fig. 7 is a high-pressure section logic control circuit theory diagram, detect primary current and input voltage value, regulate computing after, according to output by-pass cock frequency as a result, after isolation drive, it is open-minded to drive the complementation of half-bridge resonance upper and lower bridge arm, by the variation of switching frequency, can control the size of power output, the suitable Control Parameter that is provided with, can be so that the input current waveform near sinusoidal, thus input power factor is higher, and power factor can be greater than 0.96 in the reality.Fig. 8 is the input current waveform of actual measurement.
The output of transformer secondary also can be adopted single tube voltage multiplying rectifier mode, as shown in Figure 9.The circuit of secondary connects as follows: capacitor C 5 is with in parallel with the transformer secondary after the anode of diode D5 connects into series arm in turn; The anode of magnetron is connected with the negative electrode of diode D5, and the negative electrode of magnetron is connected with the anode of diode D5.Because the energy storage effect of capacitor C 5 makes the magnetron both end voltage obtain multiplication.
The resonant capacitance of the half-bridge resonance circuit on the former limit of high-tension circuit also has multiple connected mode, so circuit can have various deformation.Be connected to the high-pressure side on the former limit of transformer such as resonant capacitance C201 among Figure 10; Resonant capacitance among Figure 11 is divided into two C202 and C203, divides the high pressure section and the low-pressure end that are connected to the former limit of transformer.
The connected mode of transformer input resonant capacitance and transformer output voltage doubling rectifing circuit can combine, and form new circuit, here no longer explanation.
For increasing power output, high-tension circuit can adopt the mode of two the former limit series connection of transformer secondary parallel connection, and Figure 12 is its circuit theory diagrams.Under the situation that does not increase the magnetron both end voltage, power output can double like this.
For obtaining bigger power, high-pressure section can adopt the mode of full-bridge resonance, and Figure 13 is its circuit theory diagrams.Transformer also can adopt the mode of two the former limit series connection of transformer secondary parallel connection on this basis, and Figure 14 is its circuit theory diagrams.
Heater chain can adopt half-bridge resonance or single tube resonance scheme, and its realization and operation principle are described below:
Heater chain adopts half-bridge resonance circuit and control principle such as Figure 15, and main circuit is: the interchange of input or direct current are exported after inductance L 4 and capacitor C 4 filtering after the rectifier bridge rectification.Filtered voltage is supplied with half bridge resonant transformer, and for dwindling the volume of converter, resonant inductance can be integrated in the transformer, utilizes transformer leakage inductance as resonant inductance.Physical circuit comprises the 3rd switching tube Q3, the 4th switching tube Q4 that connects in turn, and resistance R 2, the former limit L5 of transformer and capacitor C 5 are in parallel with the 4th switching tube Q4 after being connected into the resonance branch road.
The output of transformer secondary connects magnetron heater.
Control circuit can adopt the similar control chip of IR2153 or L6569 or other, and these chips are integrated to be driven and PWM generation function.For realizing Current Control, comprise current feedback loop in the circuit, the resistance value the during C5 of the control capacitance as a result discharge of current feedback, thus make switching tube service time fix, another switching tube service time changes with feedback.It is constant that this circuit and control can be controlled heater current, by given variation, promptly by bigger electric current set-point of given when start, less current set-point after the operate as normal, can be implemented in when starting shooting with bigger current flow heats filament, during operate as normal with constant less current work, thereby guarantee to open fast the reliability of machine and work.Such as in a switch periods, because switching tube Q3, the Q4 complementation is open-minded, the service time of control switch pipe Q4 is fixed, Q3 service time is adjusted, and it is longer that promptly the former limit of longer transformer of time that switching tube Q3 opens when start is connected into time of main circuit, thereby the energy of presenting is more, make power output become big, output can be with big current flow heats filament.After a period of time, the service time of switching tube Q3 shortens, and it is shorter that the former limit of transformer is connected into the time of main circuit, thereby the energy of presenting is less, guarantees filament steady operation on constant relative less current.
Filament single tube resonant circuit and control principle such as Figure 16, control circuit detects electric current and carries out FEEDBACK CONTROL, determine ON time according to feedback result, the while control circuit is sense switch pipe both end voltage and input voltage automatically, and the assurance voltage resonance is opened switching tube Q5 when resonant inductance L2 both end voltage is lower than input voltage, can reduce turn-on consumption like this, raise the efficiency, by suitable control, can realize when the switching tube both end voltage is zero open-minded, thereby realize that no-voltage is open-minded; It is constant that this same circuit and control can be controlled heater current.Feedback among the figure and control circuit carry out feedback regulation, determine the service time of switching tube; The turn-off time of switching tube is determined by main circuit parameter.By suitable main circuit parameter and the control circuit parameter of being provided with, can guarantee has bigger electric current to heat when magnetron starts, guarantee the magnetron reliably working with less constant current after the operate as normal, thereby guarantee to open fast the reliability of machine and work.
As Figure 15, the input rectifying filtering part of the filament part in 16 can be shared with main circuit, can simplify circuit structure like this, reduces cost.
Aforesaid circuit and control method can be applied under the direct current input condition, and can cancel the input rectifying bridge this moment, or keep the input rectifying bridge as preventing the input inversion function.
Above-mentioned magnetron drive power supply has very strong adaptability, when the magnetron parameter of different manufacturers or different batches during in the certain limit deviation, still can guarantee the operate as normal of magnetron.
Claims (10)
1. magnetron drive power supply, comprise power end, the high-tension circuit that is connected with power end, high-tension circuit is carried out first logic control circuit of controlling and driving, it is characterized in that: also comprise heater chain, its input is connected with described power end, and comprises second logic control circuit that heater chain is carried out controlling and driving.
2. magnetron drive power supply according to claim 1, it is characterized in that: described high-tension circuit comprises current rectifying and wave filtering circuit and the switching tube branch road that connects in turn, and the resonance branch road that comprises the former limit of transformer that is in parallel with described switching tube branch road, the secondary output of transformer.
3. magnetron drive power supply according to claim 2 is characterized in that: described switching tube branch road comprises first switching tube (Q1), second switch pipe (Q2) and the current sampling resistor (R) that connects in turn; The former limit (L2) of transformer and electric capacity (C2) are in parallel with second switch pipe (Q2) after being connected into the resonance branch road; Perhaps described switching tube branch road comprises the bridge-type connecting circuit that is made of four switching tubes, wherein the 6th switching tube (Q6), the 9th switching tube (Q9) are connected into first switching branches, and the 7th switching tube (Q7), the 8th switching tube (Q8) are connected into the second switch branch road; Described resonance branch road is connected between the tie point of the tie point of the 7th, eight liang of switching tube (Q7, Q8) and the 6th, nine liang of switching tube (Q6, Q9).
4. magnetron drive power supply according to claim 2, it is characterized in that: described resonance branch road comprises former limit of transformer (L2) and the resonant capacitance (C2) that connects in turn, and described resonant capacitance is connected in the high-pressure side or the low-pressure end on the former limit of described transformer or is connected high-pressure side and low-pressure end simultaneously; Described transformer comprises at least one former limit and secondary or two the former limits of polyphone and the secondary that is connected in parallel to each other each other.
5. according to the described magnetron drive power supply of 2 to 4 arbitrary claims, it is characterized in that: described transformer secondary output circuit comprises: the negative electrode of the 4th diode (D4) is connected with the anode of the 3rd diode (D3); The anode output of the negative electrode of the 3rd diode (D3) and the 4th diode (D4); Be connected in the two ends of the 3rd diode (D3) and the 4th diode (D4) after the 3rd electric capacity (C3) and the 4th electric capacity (C4) series connection; Transformer secondary one end links to each other with the tie point of two diodes, and the other end links to each other with the tie point of two electric capacity; Perhaps
Described transformer secondary output circuit comprises: electric capacity (C5) is with in parallel with the transformer secondary after the anode of diode (D5) connects into series arm in turn; The negative electrode of diode (D5) and anode are two outputs.
6. magnetron drive power supply according to claim 1, it is characterized in that: described heater chain is the half-bridge resonance circuit, comprise the switching tube branch road that connects in turn by the 3rd switching tube (Q3), the 4th switching tube (Q4) and resistance (R2), the former limit (L5) of transformer and electric capacity (C5) are in parallel with the 4th switching tube (Q4) after connecting into the resonance branch road, the secondary output of transformer.
7. magnetron drive power supply according to claim 1, it is characterized in that: described heater chain is the single tube resonant circuit, comprise the switching tube branch road that single switching transistor (Q5) is formed, the former limit (L5) of transformer be connected the secondary output of transformer after electric capacity (C5) connects into the resonance branch road with switching tube (Q5).
8. according to the control method of the described magnetron drive power supply of 2 to 4 arbitrary claims, its high-tension circuit controlling features is a variable frequency control, and power output was big when switching frequency was low, and power output was little when switching frequency was high; Described control circuit detects input current and input voltage, carries out feedback regulation, and power output is stable when changing within the specific limits with the control input voltage, thereby realizes that microwave output power is stable.
9. control method according to the described magnetron drive power supply of claim 6, it is characterized in that: fix for switching tube service time in the described heater chain, another switching tube service time changes with feedback, by given variation, in a switch periods, increase service time can realize having bigger electric current to heat when magnetron starts; In a switch periods,, can realize that magnetron is with less constant current operate as normal by shortening switching tube service time.
10. control method according to the described magnetron drive power supply of claim 7, it is characterized in that: the switching tube turn-off time is determined by main circuit parameter, service time is by the feedback decision, by given variation, increasing service time realization magnetron in a switch periods has bigger electric current to heat, by shortening switching tube service time, guarantee that magnetron is with less constant current operate as normal.
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| CN2006100625959A CN101106846B (en) | 2006-09-13 | 2006-09-13 | A driving power and control method for magnetic control tube |
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| CN2006100625959A CN101106846B (en) | 2006-09-13 | 2006-09-13 | A driving power and control method for magnetic control tube |
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| JP3830144B2 (en) * | 2002-06-21 | 2006-10-04 | 松下電器産業株式会社 | Power control method and apparatus for high frequency dielectric heating |
| CN200983685Y (en) * | 2006-09-13 | 2007-11-28 | 阮世良 | Driving power supply of magnetic control tube |
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| CN101106846B (en) | 2011-09-21 |
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