CN201556599U - Special driving power supply for magnetrons - Google Patents

Special driving power supply for magnetrons Download PDF

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Publication number
CN201556599U
CN201556599U CN2009201794544U CN200920179454U CN201556599U CN 201556599 U CN201556599 U CN 201556599U CN 2009201794544 U CN2009201794544 U CN 2009201794544U CN 200920179454 U CN200920179454 U CN 200920179454U CN 201556599 U CN201556599 U CN 201556599U
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CN
China
Prior art keywords
bridge
voltage
pwm
driving power
magnetron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2009201794544U
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Chinese (zh)
Inventor
李晟
陈智雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianshui Huayuan Pharmaceutical Equipment Technology Co Ltd
Original Assignee
Tianshui Huayuan Pharmaceutical Equipment Technology Co Ltd
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Priority to CN2009201794544U priority Critical patent/CN201556599U/en
Application granted granted Critical
Publication of CN201556599U publication Critical patent/CN201556599U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a special driving power supply for magnetrons, which consists of a rectifier (2), a PWM full bridge IC (U1), a PWM half bridge IC (U2), a high-voltage transformer (1), a filament transformer (T2) and a high-voltage high-frequency rectifier (7). The special driving power supply is characterized in that the special driving power supply adopts a full-bridge transformer mode for high voltage control and a half-bridge transformer mode for filament control. The PWM full bridge IC (U1) and the PWM half bridge IC (U2) are parallelly connected to an output end of the rectifier (2), an output end of the PWM full bridge IC (U1) is connected with the high-voltage transformer (T1) which outputs alternating current in a voltage varying form, and the alternating current is then rectified into constant-voltage direct current by the high-voltage high-frequency rectifier (7) so as to provide high-voltage direct current required by operation of magnetrons. The filament transformer (T2) is connected to an output end of the PWM half bridge IC (U2) and outputs alternating current required by filaments of the magnetrons in a voltage varying form. The PWM full bridge IC (U1) and the PWM half bridge IC (U2) are both provided with protection signal output ends so as to realize mutual control and unitized protection. The special driving power supply for magnetrons adopts a modular package mode and is small in volume, convenient for installation, simple in control and fine in stability.

Description

The special-purpose driving power of a kind of magnetron
Technical field:
The present invention relates to a kind of power circuit.Be specifically related to the special-purpose driving power of a kind of magnetron.
Technical background:
At present, relevant driving magnetron power supply mainly is made up of filament transformer, high-tension transformer, high-voltage capacitance, high voltage silicon stack, and the course of work is: by filament transformer with 220V alternating current transformation, for magnetron heater provides required filament voltage.By a high-tension transformer alternating current transformation of 220V is become High Level AC Voltage more than the 2000V, become the required high voltage direct current of magnetron with the high voltage silicon stack voltage multiplying rectifier through high-voltage capacitance again, this high voltage direct current is inserted an end of magnetron heater, form a high tension loop with the magnetron earth terminal, excitation magnetron cavity internal electron high speed rotating finally forms microwave.
Non-transformer voltage stabilizing part in the magnetron drive power supply of this kind routine; therefore the high-frequency harmonic in the electrical network can enter into power panel; the high-frequency harmonic that power panel produces also can enter in the electrical network; cause the 220V ac electrode instability of electrical network output; and lack power adjustments function and feedback protection function in this kind power driving circuit, the high-frequency harmonic that often is subjected in the power supply disturbs, and causes magnetron power supply poor stability; damage magnetron and other electric elements easily, need often maintenance.And the control device of this kind microwave equipment exists scattered, the various contacts of installation various, great workload and complicated program are brought in aspects such as the installation of the equipment of giving, debugging, maintenance, and used the high-tension transformer of power frequency in the configuration of this kind driving power, its inefficiency, power consumption, heat dissipation capacity are big, have only 60% energy output, nearly 40% energy does not obtain discharging and utilizing.
Summary of the invention:
The purpose of this utility model is to overcome the deficiencies in the prior art and provides a kind of magnetron special-purpose driving power, adopt the design of modularization packaged type, it is little that it takies volume, easy for installation, simple and the good stability of control, can effectively avoid above-described installation and maintenance inconvenience, the high-frequency harmonic in the power supply disturbs big, problems such as poor work stability.
The purpose of this utility model can be by realizing by the following technical solutions: the special-purpose driving power of a kind of magnetron, mainly include rectifier (2), PWM (pulse-width regulated) full-bridge IC (integrated circuit) (applies for utility model patent: a kind of high pressure full-bridge conversion integrated circuit) (U1) on the same day, PWM (pulse-width regulated) half-bridge IC (integrated circuit) (applies for utility model patent: a kind of semi-bridge alternation integrated circuit that is used to control magnetron heater work) (U2) on the same day, high-tension transformer (T1), filament transformer (T2), high voltagehigh frequency rectifier (7).
It is characterized in that high-pressure section control employing full-bridge converter pattern, filament is partly controlled the slab bridge converter pattern that adopts.Civil power through rectifier (2) rectification handle the direct current of exporting the back divide two-way send into respectively PWM (pulse-width regulated) full-bridge IC (integrated circuit) (U1) and PWM (pulse-width regulated) half-bridge IC (integrated circuit) (U2), receive high-tension transformer (T1) through the alternating current that PWM (pulse-width regulated) full-bridge IC (integrated circuit) (U1) exports, export the alternating current of 4100V again by high-tension transformer (T1) transformation, be isobaric direct current by high voltagehigh frequency rectifier (7) rectification afterwards, for magnetron provides work required high voltage direct current.Receive filament transformer (T2) through the alternating current that PWM (pulse-width regulated) half-bridge IC (integrated circuit) (U2) exports, again by filament transformer (T2) transformation output magnetron heater required voltage.Wherein, two IC (integrated circuit) all have guard signal output PA, when protection takes place one of them PWM (pulse-width regulated) IC, can output signal to another PWM (pulse-width regulated) IC, reach the effect of the Combined Protection of shutting down simultaneously.
In order to make the voltage that is transported to rectifier (2) more stable, in this driving power, can add EMI (electromagnetic interference) filter (1) before at rectifier (2), it is formed common mode disturbances by two choke L1, L2, C1, C2, C3, discharge resistance R1 and suppresses network, reach the interference of eliminating electrical network medium-high frequency harmonic wave, the purpose of burning voltage, the effect of R1 are that the electricity that filter capacity is stored when cutting off the electricity supply bleeds off fast.
PWM (pulse-width regulated) full-bridge IC (integrated circuit) (U1), its inner integrated overvoltage, under-voltage, overcurrent, thermal-shutdown circuit.Direct voltage after rectifier (2) rectification enters U1 from the pin one HV end of U1, OUTA, B are power take-off, drive high-tension transformer T1 through capacitance C13, the driven by magnetron voltage that obtains 4100VDC after filtering inductance L 3, high-voltage filtering capacitor C14 and the C15 filtering is passed through in the rectifier bridge BR2 rectification through high voltagehigh frequency rectifier (7) in of the high pressure of high-tension transformer T1 output again.Wherein two of high-voltage rectifying bridge BR1 inputs are connected two outputs of high-tension transformer T1, the end of filter inductance L3 is connected the output of high-voltage rectifying bridge BR1, the other end is connected with C15 with the C14 that is connected in parallel, and the other end of high-voltage filtering capacitor C14 and C15 is connected to another output of high-voltage rectifying bridge BR1.Form high-voltage detecting circuit by U3, R2, R3, after U3 isolates, feed back to the 7th the pin FB end of U1.Wherein, high-voltage filtering capacitor C14 and C15 are connected in parallel between two inputs of optocoupler U3.
With PWM full-bridge IC (U1) arranged side by side be PWM half-bridge IC (U2), effect is to supply with the required stable power of magnetron heater.Its mode of operation is the steady job frequency, the inner automatic adjustment pulse-width modulation, and constant output, abnormity protection circuit appears in inner integrated overvoltage, under-voltage, overcurrent, excess temperature, filament.Direct voltage after rectifier (2) rectification enters U2 from the pin one HV end of U2 equally, and OUT is a power take-off, drives filament transformer T2 through C16, directly drives magnetron heater by T2 output AC electricity.The C16 position is a capacitance, and effect is the flip-flop of isolating U2 output, prevents the transformer magnetic saturation.High pressure insurance F2 is connected between filament transformer output and the high direct voltage, and effect is to carry out fuse protection when short circuit or overload appear in magnetron.
The beneficial effects of the utility model are: the utility model adopts the design of modularization packaged type, and it is little that it takies volume, easy for installation, simple and the good stability of control, can effectively avoid above-described installation and maintenance inconvenience, the high-frequency harmonic in the power supply disturbs big, problems such as poor work stability.Be provided with power supply voltage stabilizing part in this kind magnetron drive power supply; avoid the high-frequency harmonic in the electrical network can enter into power panel; reach the stable 220V alternating current of electrical network output; and introduce power conditioning circuitry unit and feedback protection circuit unit in this kind power driving circuit; effectively improve the stability of magnetron power supply, reduced magnetron and other electric elements spoilages.And this kind driving power adopts autonomous high-tension transformer successfully to replace the high-tension transformer of power frequency, its high efficiency, and power consumption, heat dissipation capacity are little, can reach the energy utilization more than 95%.
Description of drawings:
Fig. 1 is the utility model structure of block diagram figure.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment:
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:
Complex chart 1, shown in Figure 2, the special-purpose driving power of a kind of magnetron, mainly include rectifier (2), PWM (pulse-width regulated) full-bridge IC (integrated circuit) (applies for utility model patent: a kind of high pressure full-bridge conversion integrated chip) (U1) on the same day, PWM (pulse-width regulated) half-bridge IC (integrated circuit) (applies for utility model patent: a kind of semi-bridge alternation integrated circuit that is used to control magnetron heater work) (U2) on the same day, high-tension transformer (T1), filament transformer (T2), high voltagehigh frequency rectifier (7).
During work, in order to eliminate the interference of electrical network medium-high frequency harmonic wave, the purpose of burning voltage can select 180V ~ 240V civil power to export stable 220V alternating current after electromagnetic interface filter (1) Filtering Processing, afterwards through rectifier (2) rectification.The direct current of being sent by rectifier (2) divides two-way to send into PWM (pulse-width regulated) half-bridge IC (U2) and PWM (pulse-width modulation) full-bridge IC (U1) respectively,, supply with magnetron heater by the alternating current of filament transformer (5) transformation output 3.3V again and heat to filament transformer (5) through the elementary alternating current of PWM (pulse-width regulated) half-bridge IC (U2) conversion output.Export elementary alternating current to high-tension transformer (T1) through PWM (pulse-width modulation) full-bridge IC (U1) conversion, export the alternating current of 4100V again by high-tension transformer (T1), by high voltagehigh frequency rectification circuit (7) rectification is isobaric direct current, for magnetron provides work required high direct voltage.Wherein, two IC (integrated circuit) all have guard signal output PA, when protection takes place one of them PWM (pulse-width regulated) IC, can output signal to another PWM (pulse-width regulated) IC, reach the Combined Protection of shutting down simultaneously.
EMI (electromagnetic interference) filter (1) is by two choke L1, L2, capacitor C 1, C2, C3, discharge resistance R1 form common mode disturbances and suppress network, reach the interference of eliminating electrical network medium-high frequency harmonic wave, the purpose of burning voltage, R1's can bleed off the electricity that filter capacity stores fast when cutting off the electricity supply.
Direct voltage after rectifier (2) rectification enters U1 from the pin one HV end of U1, OUTA, B are power take-off, drive high-tension transformer T1 through capacitance C13, the driven by magnetron voltage that obtains 4100VDC after filtering inductance L 3, high-voltage filtering capacitor C14 and the C15 filtering is passed through in the rectifier bridge BR2 rectification through high voltagehigh frequency rectifier (7) in of the high pressure of high-tension transformer T1 output again.High pressure is connected to by U3, R2, R3 forms high-voltage detecting circuit (8), and the 7th the pin FB end that feeds back to U1 after U3 isolates carries out the adjusting of pulse-width modulation, thereby keeps the constant of output voltage.
With PWM full-bridge IC (U1) arranged side by side be PWM half-bridge IC (U2), effect is to supply with the required stable power of magnetron heater.Direct voltage after rectifier (2) rectification enters U2 from the pin one HV end of U2, and OUT is a power take-off, drives filament transformer T2 through C16, directly drives magnetron heater by T2 output AC electricity.The C16 position is a capacitance, and effect is the flip-flop of isolating U2 output, prevents the transformer magnetic saturation.High pressure insurance F2 is connected between filament transformer output and the high direct voltage, and effect is to carry out fuse protection when short circuit or overload appear in magnetron.
It should be noted that at last: above embodiment only in order to the explanation the utility model and and the described technical scheme of unrestricted the utility model.All do not break away from the technical scheme and the improvement thereof of utility model spirit and scope, and it all should be encompassed in the claim scope of the present utility model.

Claims (7)

1. the special-purpose driving power of a magnetron, mainly include rectifier (2), PWM full-bridge IC (U1), PWM half-bridge IC (U2), high-tension transformer (T1), filament transformer (T2), high voltagehigh frequency rectifier (7), it is characterized in that being concatenated into after PWM full-bridge IC (U1) and PWM half-bridge IC (U2) parallel connection output of rectifier (2), output termination one high-tension transformer (T1) of PWM full-bridge IC (U1), the output termination one high voltagehigh frequency rectifier (7) of high-tension transformer (T1), output termination one filament transformer (T2) of PWM half-bridge IC (U2).
2. the special-purpose driving power of a kind of magnetron according to claim 1, it is characterized in that described PWM full-bridge IC (U1) inner integrated overvoltage, under-voltage, overcurrent, thermal-shutdown circuit.
3. the special-purpose driving power of a kind of magnetron according to claim 1, it is characterized in that described PWM half-bridge IC (U2) inner integrated overvoltage, under-voltage, overcurrent, excess temperature, filament abnormity protection circuit.
4. the special-purpose driving power of a kind of magnetron according to claim 1, it is characterized in that described high voltagehigh frequency rectifier (7), be made up of rectifier bridge BR2, filter inductance L3, high-voltage filtering capacitor C14 and C15, the rectifier bridge BR2 rectification of high pressure in high voltagehigh frequency rectifier (7) of high-tension transformer T1 output is again through obtaining the driven by magnetron voltage of 4100VDC after filtering inductance L 3, high-voltage filtering capacitor C14 and the C15 filtering.
5. the special-purpose driving power of a kind of magnetron according to claim 1, it is characterized in that also comprising in this driving power electromagnetic interface filter (1), form common mode disturbances by two choke L1, L2, C1, C2, C3, discharge resistance R1 and suppress network, reach the interference of eliminating electrical network medium-high frequency harmonic wave, the purpose of burning voltage.
6. the special-purpose driving power of a kind of magnetron according to claim 1, it is characterized in that also comprising in this driving power and form high-voltage detecting circuit (8) by U3, R2, R3, the magnetron operating voltage feeds back to U1 after U3 isolates the 7th pin FB end carries out pulsewidth key joint, thereby keeps the constant of output voltage.
7. the special-purpose driving power of a kind of magnetron according to claim 1 is characterized in that the special-purpose driving power of this magnetron is a package module state.
CN2009201794544U 2009-09-14 2009-09-14 Special driving power supply for magnetrons Expired - Fee Related CN201556599U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009201794544U CN201556599U (en) 2009-09-14 2009-09-14 Special driving power supply for magnetrons

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Application Number Priority Date Filing Date Title
CN2009201794544U CN201556599U (en) 2009-09-14 2009-09-14 Special driving power supply for magnetrons

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105101503A (en) * 2015-08-26 2015-11-25 西安因变光电科技有限公司 Concentrated power supply system and method of terminal voltage-multiplying multiple magnetic magnetrons
CN106658806A (en) * 2017-01-06 2017-05-10 浙江全世科技有限公司 Digital magnetron power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105101503A (en) * 2015-08-26 2015-11-25 西安因变光电科技有限公司 Concentrated power supply system and method of terminal voltage-multiplying multiple magnetic magnetrons
CN106658806A (en) * 2017-01-06 2017-05-10 浙江全世科技有限公司 Digital magnetron power supply

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100818

Termination date: 20170914

CF01 Termination of patent right due to non-payment of annual fee