CN202750315U - Magnetron filament power supply circuit - Google Patents
Magnetron filament power supply circuit Download PDFInfo
- Publication number
- CN202750315U CN202750315U CN 201220431142 CN201220431142U CN202750315U CN 202750315 U CN202750315 U CN 202750315U CN 201220431142 CN201220431142 CN 201220431142 CN 201220431142 U CN201220431142 U CN 201220431142U CN 202750315 U CN202750315 U CN 202750315U
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- filament
- magnetron
- power supply
- circuit
- diode
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Abstract
The utility model discloses a magnetron filament power supply circuit comprising a primary side circuit, a transformer, and a secondary side circuit, and the primary side circuit and the secondary side circuit are coupled through the transformer; the secondary side circuit comprises a filament power supply circuit and a magnetron drive circuit, and the transformer comprises a filament winding and a high pressure winding; an input terminal of the magnetron drive circuit is connected with the high pressure winding, and an output terminal of the magnetron drive circuit is respectively connected with an anode and the filament of the magnetron; the filament winding is provided with a center tap, a first diode and a second diode of the filament power supply circuit are electrically connected with the filament winding, so a full wave rectifier circuit outputted by the filament winding is formed, and an output terminal of the full wave rectifier circuit is connected with the magnetron filament; and a current limiting inductance of the filament power supply circuit is connected in the full wave rectifier circuit and is also connected in series with the first diode. The magnetron filament power supply circuit can adjust filament current through adjusting a size of inductance value of the current limiting inductance, the circuit is simple in structure, easy in adjustment, and requirements to the filament current by magnetrons and filament wire lengths of various models are satisfied.
Description
[technical field]
The utility model relates to the magnetron power supply, relates in particular to a kind of magnetron heater power supply circuits.
[background technology]
Existing magnetron variable frequency power supply has adopted high-frequency electronic transformer to replace traditional Industrial Frequency Transformer, and high-frequency electronic transformer has the characteristics such as efficient height, good reliability, operating voltage be wide.The model of the magnetron that different microwave equipments are used may be different, and the length of filament supply lines also may be different, and some industrial microwave equipment filament supply lines reaches 2 meters, and some civilian microwave ovens, the length of filament supply lines only has 0.2 meter.
Fig. 1 is conventional domestic magnetron power supply the principle figure, and DC power supply is by the conventional DC Power supply or by obtaining after the AC power rectification.Direct current is through transformer driver element copped wave rear drive high-tension transformer T.High-tension transformer T has three windings, be respectively Filament Winding T2 and the high pressure winding T3 of former limit winding T1, secondary, Filament Winding T2 only has a circle usually, directly the power supply magnetron heater winding, therefore heater current is the square wave alternating-current electric current, and the output of high pressure winding T3 is worked through hv filtering unit rectifying and wave-filtering rear drive magnetron M.
The magnetron heater condition of work has low-voltage, the characteristics of large electric current, and under the condition of high frequency power supply, the difference of filament supply lines length or magnetron model difference can cause different heater currents; On the other hand, because the coil turn of high frequency transformer is less, filament power supply winding often only has a circle, is difficult to realize control to heater current by the adjustment to filament power supply winding turns ratio, thereby needs the adjustable circuit of a kind of heater current to regulate heater current to make it to reach rated value.
[summary of the invention]
The technical problems to be solved in the utility model provides a kind of magnetron heater power supply circuits of being convenient to adjust heater current, mates the magnetron of different model or the filament supply lines of different length.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of magnetron heater power supply circuits comprise former limit circuit, transformer and secondary circuit, and former limit circuit and secondary circuit are by transformer coupled; Secondary circuit comprises filament power supply circuits and drive circuit of magnetron, and the transformer secondary comprises Filament Winding and high pressure winding; The input termination Filament Winding of filament power supply circuits, output termination magnetron heater; The input termination high voltage winding group of drive circuit of magnetron, output connects respectively anode and the filament of magnetron; Filament Winding has centre cap, the filament power supply circuits comprise current-limiting inductance, the first diode and the second diode, the first diode and the second diode are electrically connected with Filament Winding, consist of the full-wave rectifying circuit of Filament Winding output, the output termination magnetron heater of full-wave rectifying circuit; Described current-limiting inductance is connected in the full-wave rectifying circuit, connects with the first diode.
Above-described magnetron heater power supply circuits comprise high frequency capacitance, and described high frequency capacitance is connected between two outputs of full-wave rectifying circuit.
Above-described magnetron heater power supply circuits, the centre cap of Filament Winding connect an end of magnetron heater, and the negative electrode of the first diode connects the first end of Filament Winding by current-limiting inductance, and anode connects the other end of magnetron heater; The negative electrode of the second diode connects the second end of Filament Winding, and anode connects the anode of the first diode.
Above-described magnetron heater power supply circuits, the centre cap of Filament Winding connect an end of magnetron heater, and the anode of the first diode connects the first end of Filament Winding by current-limiting inductance, and negative electrode connects the other end of magnetron heater; The anode of the second diode connects the second end of Filament Winding, and negative electrode connects the negative electrode of the first diode.
Above-described magnetron heater power supply circuits, the number of turns of Filament Winding are two circles.
The utility model magnetron heater power supply circuits just can be regulated heater current and reach required rated value by regulating the size of current-limiting inductance inductance value; The utility model circuit structure is simple, and is easy to adjust, can satisfy different model magnetron and filament line length to the demand of heater current.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is prior art magnetron heater power supply primary circuit reason figure
Fig. 2 is the magnetron heater power supply circuits schematic diagram of the utility model embodiment 1.
Fig. 3 is the magnetron heater power supply circuits schematic diagram of the utility model embodiment 1.
[embodiment]
The magnetron heater power supply circuits of the utility model embodiment 1 comprise former limit circuit, transformer T and secondary circuit as shown in Figure 2.Former limit circuit comprises DC power supply and power drive unit, and secondary circuit comprises filament power supply circuits and drive circuit of magnetron, and former limit circuit and secondary circuit are by transformer T coupling.The secondary of transformer T comprises Filament Winding T2 and high pressure winding T3.Drive circuit of magnetron comprises the high-voltage rectifying filter unit, the input termination high voltage winding group T3 of high-voltage rectifying filter unit, and output connects respectively anode and the filament of magnetron M.
Filament Winding T2 is two circles, has centre cap.
The filament power supply circuits comprise current-limiting inductance L, diode D1 and diode D2, and diode D1 and diode D2 are electrically connected with Filament Winding T2, consist of the full-wave rectifying circuit of Filament Winding T2 output, the output termination magnetron M filament of full-wave rectifying circuit.Current-limiting inductance L is connected in the full-wave rectifying circuit, and D1 connects with diode.High frequency capacitance C is connected between two outputs of full-wave rectifying circuit.
The concrete connection of the circuit of embodiment 1 is, the centre cap of Filament Winding T2 connects an end of magnetron M filament, and the negative electrode of diode D1 connects the first end of Filament Winding T2 by current-limiting inductance L, and anode connects the other end of magnetron M filament.The negative electrode of diode D2 connects the second end of Filament Winding T2, and anode connects the anode of diode D1.
For the circuit of Fig. 1 prior art, the Filament Winding T2 of embodiment 1 high-tension transformer T is many centre cap, Filament Winding T2 is made of two circles, finish full-wave rectification via two diode D1 and D2 after, the filament power supply of giving magnetron M.For fear of damaging diode D1 and D2 owing to high voltage arc, the filament two ends of magnetron M and on high frequency capacitance C.Because the specified heater current of the magnetron M of various different models is also incomplete same, and in different application scenarios, the length of filament wire also is different, need filament supply line to adjust flexibly heater current according to the length of filament wire and the model of magnetron M, therefore in the end string current limiting inductance L of diode D1, for different application scenarios, only need to adjust the size of current-limiting inductance L inductance value, just can adjust flexibly the size of heater current, for example, when the inductance value of current-limiting inductance L is 1uH, can supply with the electric current that filament reaches 14A, and the inductance value of current-limiting inductance L is 100uH be, the filament power supply circuits are equivalent to from full-wave rectification become halfwave rectifier, and heater current then only has 10A.By regulating the inductance value of current-limiting inductance L, can satisfy easily and flexibly different model magnetron and different filament line length to the demand of heater current.
The principle of the magnetron heater power supply circuits of the utility model embodiment 2 is identical with embodiment 1, just the connection of circuit is slightly different, in embodiment 2, the centre cap of Filament Winding T2 connects an end of magnetron M filament, the anode of diode D1 connects the first end of Filament Winding T2 by current-limiting inductance L, and negative electrode connects the other end of magnetron M filament.The anode of diode D2 connects the second end of Filament Winding T2, and negative electrode connects the negative electrode of diode D1.
Claims (5)
1. magnetron heater power supply circuits comprise former limit circuit, transformer and secondary circuit, and former limit circuit and secondary circuit are by transformer coupled; Secondary circuit comprises filament power supply circuits and drive circuit of magnetron, and the transformer secondary comprises Filament Winding and high pressure winding; The input termination Filament Winding of filament power supply circuits, output termination magnetron heater; The input termination high voltage winding group of drive circuit of magnetron, output connects respectively anode and the filament of magnetron; It is characterized in that, Filament Winding has centre cap, the filament power supply circuits comprise current-limiting inductance, the first diode and the second diode, the first diode and the second diode are electrically connected with Filament Winding, consist of the full-wave rectifying circuit of Filament Winding output, the output termination magnetron heater of full-wave rectifying circuit; Described current-limiting inductance is connected in the full-wave rectifying circuit, connects with the first diode.
2. magnetron heater power supply circuits according to claim 1 is characterized in that, comprise high frequency capacitance, and described high frequency capacitance is connected between two outputs of full-wave rectifying circuit.
3. magnetron heater power supply circuits according to claim 1, it is characterized in that, the centre cap of Filament Winding connects an end of magnetron heater, and the negative electrode of the first diode connects the first end of Filament Winding by current-limiting inductance, and anode connects the other end of magnetron heater; The negative electrode of the second diode connects the second end of Filament Winding, and anode connects the anode of the first diode.
4. magnetron heater power supply circuits according to claim 1, it is characterized in that, the centre cap of Filament Winding connects an end of magnetron heater, and the anode of the first diode connects the first end of Filament Winding by current-limiting inductance, and negative electrode connects the other end of magnetron heater; The anode of the second diode connects the second end of Filament Winding, and negative electrode connects the negative electrode of the first diode.
5. magnetron heater power supply circuits according to claim 1 is characterized in that, the number of turns of Filament Winding is two circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220431142 CN202750315U (en) | 2012-08-28 | 2012-08-28 | Magnetron filament power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220431142 CN202750315U (en) | 2012-08-28 | 2012-08-28 | Magnetron filament power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202750315U true CN202750315U (en) | 2013-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220431142 Expired - Fee Related CN202750315U (en) | 2012-08-28 | 2012-08-28 | Magnetron filament power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202750315U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767402A (en) * | 2015-04-17 | 2015-07-08 | 东华大学 | Inverter microwave oven power supply adopting multi-output bridge-type power converter |
| 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 |
-
2012
- 2012-08-28 CN CN 201220431142 patent/CN202750315U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767402A (en) * | 2015-04-17 | 2015-07-08 | 东华大学 | Inverter microwave oven power supply adopting multi-output bridge-type power converter |
| 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 |
| WO2019080355A1 (en) * | 2017-10-25 | 2019-05-02 | 广东美的厨房电器制造有限公司 | Magnetron filament control circuit and magnetron power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20210828 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |