CN203287429U - Microwave detection circuit used for magnetrons - Google Patents
Microwave detection circuit used for magnetrons Download PDFInfo
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- CN203287429U CN203287429U CN2013203290079U CN201320329007U CN203287429U CN 203287429 U CN203287429 U CN 203287429U CN 2013203290079 U CN2013203290079 U CN 2013203290079U CN 201320329007 U CN201320329007 U CN 201320329007U CN 203287429 U CN203287429 U CN 203287429U
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Abstract
The utility model provides a microwave detection circuit used for magnetrons. The microwave detection circuit used for the magnetrons includes a current transducer, a current sampling module, a rectification module, an electronic switch module, a first detection signal output terminal and a second detection signal output terminal. The current transducer is used for converting first AC current flowing through a primary side of a transformer to second AC current. The current sampling module is used for sampling the second AC current of the current transducer to be AC voltage. The rectification module is used for converting the AC voltage to DC voltage. When the DC voltage is higher than starting voltage of the electronic switch module, the electronic switch is switched on, so that the first detection signal output terminal is connected with the second detection signal output terminal. When the DC voltage is lower than the starting voltage of the electronic switch module, the electronic switch module is switched off, so that the first detection signal output terminal is disconnected with the second detection signal output terminal. The microwave detection circuit used for the magnetrons provided by the utility model is completely isolated from an AC power grid, so that high voltage electric shock hazards are avoided, high frequency carriers are eliminated and microwave power of the magnetrons of the magnetrons is improved.
Description
Technical field
The utility model relates to a kind of microwave magnetron testing circuit.
Background technology
At present, 2450MHz industrial microwave energy firing equipment adopts the larger microwave power of a plurality of low-power magnetrons acquisition in parallel, effectively work in order to make equipment, controller must be monitored the microwave power output situation of each magnetron, the general testing circuit that adopts as shown in Figure 1, indirectly detect the anode current of magnetron VM by the voltage that detects sampling resistor R, and then this controller judges whether magnetron VM has microwave power output.
This kind testing circuit comprises following shortcoming: (1) detects loop high-voltage ac current, has potential safety hazard; (2) the sampling resistor R that is connected between magnetron VM anode and earth terminal has certain resistance value (approximately 10 Ω), and the pressure drop meeting that sampling resistor R two ends produce produces the microwave power loss; (3) sampling resistor R distance console is far away, and connecting line is long, and mounting process is loaded down with trivial details, and high-voltage direct current contains high fdrequency component, and under certain condition, connecting line is equivalent to the microwave emitting antenna,, to the spatial emission microwave, becomes electromagnetic pollution source; (4), if this connecting line also can cause phase interference between each magnetron output microwave in situation improperly in installation wiring, affect the output efficiency of microwave; (5) in a single day detect resistance R disconnection or ground connection collapse, can cause high direct voltage and puncture related device and control device in loop.
The utility model content
For the deficiencies in the prior art, the purpose of this utility model is intended to provide a kind of safe microwave magnetron testing circuit.
For achieving the above object, the utility model adopts following technical scheme:
A kind of microwave magnetron testing circuit, it comprises current transformer, current sample module, rectification module, electronic switch module, the first detection signal output terminal and the second detection signal output terminal;
This current transformer is converted to the second alternating current for the first alternating current of the primary side of the transformer of flowing through, and wherein the secondary side of this transformer is powered to magnetron, and wherein this second alternating current is less than the first alternating current;
This current sample module is used for the second alternating current of this current transformer is sampled as alternating voltage;
This rectification module is used for this alternating voltage is converted to DC voltage;
This electronic switch module connects rectification module, the first detection signal output terminal and the second detection signal output terminal, when DC voltage during greater than the cut-in voltage of electronic switch module, this electronic switch module conducting, so that this first detection signal output terminal is connected with this second detection signal output terminal, when DC voltage during less than the cut-in voltage of electronic switch module, this electronic switch module cut-off, so that disconnect between the first detection signal output terminal and the second detection signal output terminal.
Further, the primary side of current transformer is connected between the primary side and live wire of transformer, and the secondary side of this current transformer connects rectification module and current sample module.
Further, this current sample module is sampling resistor.
Further, this sampling resistor is adjustable resistance.
Further, this rectification module comprises the first diode and the second diode, one end of the secondary side of this current transformer connects the anode of the first diode, also by adjustable resistance, connect the first detection signal output terminal, the other end of the secondary side of current transformer connects the first detection signal output terminal, the negative electrode connecting electronic switch module of the first diode, also connect the negative electrode of the second diode, this first detection signal output terminal of the anodic bonding of this second diode.
Further, electronic switch module is Darlington transistor, and the negative electrode of this first diode connects the input end of Darlington transistor, and the input end of this Darlington transistor also connects the first detection signal output terminal, and the output terminal of this Darlington transistor connects the second detection signal output terminal.
Further, this microwave magnetron testing circuit also comprises a resistance, and this resistance is connected between the input end of this first detection signal output terminal and Darlington transistor.
Further, this microwave magnetron testing circuit also comprises a resistance, and this resistance is connected between the input end of the negative electrode of diode and Darlington transistor.
Further, this microwave magnetron testing circuit also comprises an electric capacity, and this electric capacity is connected between the negative electrode of the first detection signal output terminal and this first diode.
Further, this microwave magnetron testing circuit also comprises an electric capacity, and this electric capacity is connected between the input end of the first detection signal output terminal and Darlington transistor.
The beneficial effects of the utility model are as follows:
Above-mentioned utility model is converted to little alternating current by current transformer with large alternating current, make this testing circuit, controller and alternating current net isolate fully, avoid the high pressure Danger Electric shock risk, in addition, also make this testing circuit without high frequency carrier, thereby there do not is electromagnetic pollution, can avoid the microwave phase between anode of magnetron to interfere with each other, thereby improve the microwave power of magnetron.Moreover this testing circuit is easily installed in switch board, can greatly reduce connecting line, saves cost, avoids electromagnetic interference (EMI), improves the equipment work efficiency.
Description of drawings
Fig. 1 is the circuit diagram of prior art microwave magnetron testing circuit.
Fig. 2 is the circuit diagram of the preferred embodiments of the utility model microwave magnetron testing circuit.
Fig. 3 is the module diagram of the microwave magnetron testing circuit of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
See also Fig. 2 and Fig. 3, the utility model relates to a kind of microwave magnetron testing circuit, and its preferred embodiments comprises current transformer TA, diode D1, diode D2, adjustable resistance Rp, resistance R 1 to R3, capacitor C 1, capacitor C 2, LED and Darlington transistor U1.
the primary side of current transformer TA is connected between the primary side and live wire L of transformer T, one end of the secondary side of current transformer TA connects the anode of diode D1, also by adjustable resistance Rp, connect the first detection signal output terminal COMP, the other end of the secondary side of current transformer TA connects the first detection signal output terminal COMP, the negative electrode of diode D1 connects the input end of Darlington transistor U1 by resistance R 1, the negative electrode that also connects diode D2, this the first detection signal output terminal of the anodic bonding of this diode D2 COMP, this capacitor C 1 is connected between the negative electrode and this first detection signal output terminal COMP of diode D1, this capacitor C 2 and this resistance R 2 all are connected between the input end and this first detection signal end COMP of this Darlington transistor U1, the anode of the output terminal connecting luminous diode LED of this Darlington transistor U1, the negative electrode of this LED connects the second detection signal output terminal X, the two ends of this resistance R 3 connect respectively the output terminal of this second detection signal output terminal X and Darlington transistor U1.The first detection signal output terminal COMP be connected detection signal output terminal X and be used for connect the controller (not shown) of magnetron VM.
The principle of work of preferred embodiments of the present utility model is as follows:
While when magnetron VM heating, exporting microwave power, the electric current of the secondary side of transformer T can change, make the electric current of the primary side of transformer T produce corresponding variation, and then make the electric current of the secondary side of current transformer TA produce corresponding variation, for example, during magnetron VM preheating, the electric current of the secondary side of current transformer TA is about 3A, magnetron VM stablizes while sending microwave, and the electric current of the secondary side of current transformer TA is about 6A.
when magnetron VM does not produce microwave power (before being preheating), the pressure drop of resistance R p is the first alternating voltage such as below 1.8V, this first alternating voltage is transported to the input end of Darlington transistor U1 after diode D1 and diode D2 rectification, due to the cut-in voltage of the voltage after rectification less than Darlington transistor U1, make Darlington transistor U1 cut-off, thereby make between the first detection signal output terminal COMP and the second detection signal output terminal X and can not form closed-loop path, at this moment, the first detection signal output terminal COMP and the second detection signal output terminal X all do not have signal output, at this moment, LED is not luminous, do not export microwave power to refer to intuitively magnetron.
when magnetron VM produces microwave power, the pressure drop of resistance R p becomes the second alternating voltage such as more than 1.8V, transport to the input end of Darlington transistor U1 after this second ac voltage rectifier, due to the cut-in voltage of the voltage after rectification greater than Darlington transistor U1, make Darlington transistor U1 conducting, thereby make between the first detection signal output terminal COMP and the second detection signal output terminal X and form closed-loop path, the first detection signal output terminal COMP and the second equal output detection signal of detection signal output terminal X are to controller, so, controller can judge whether magnetron VM has microwave power output, at this moment, this LED is luminous, to indicate intuitively this magnetron VM output microwave power.
By above-mentioned principle of work as can be known, diode D1 and diode D2 play rectified action, in other embodiment, can be replaced by other rectification module such as full-bridge rectification module.This Darlington transistor U1 plays the electronics on-off action, and in other embodiment, it can be replaced as the switch module that is comprised of a plurality of triodes or field effect transistor by other electronic switch module.This adjustable resistance Rp plays the electric current sampling action, and it can be by other current sample module as being replaced by Chip-R.This LED can be replaced by other luminous indicating module.
Above-mentioned utility model is converted to little alternating current by current transformer TA with large alternating current, make this testing circuit and controller and alternating current net isolate fully, avoid the high pressure Danger Electric shock risk, in addition, also make this testing circuit without high frequency carrier, thereby there do not is electromagnetic pollution, can avoid the microwave phase between magnetron VM anode to interfere with each other, thereby improve the microwave power of magnetron VM.Moreover this testing circuit is easily installed in switch board, can greatly reduce connecting line, saves cost, avoids electromagnetic interference (EMI), improves the equipment work efficiency.
Preferably, this adjustable resistance Rp selects accurate multiturn potentiometer, so that this testing circuit is applicable to the magnetron of multiple different capacity.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection domain of the utility model claim within.
Claims (10)
1. microwave magnetron testing circuit, it is characterized in that: it comprises current transformer, current sample module, rectification module, electronic switch module, the first detection signal output terminal and the second detection signal output terminal;
This current transformer is converted to the second alternating current for the first alternating current of the primary side of the transformer of flowing through, and wherein the secondary side of this transformer is powered to magnetron, and wherein this second alternating current is less than the first alternating current;
This current sample module is used for the second alternating current of this current transformer is sampled as alternating voltage;
This rectification module is used for this alternating voltage is converted to DC voltage;
This electronic switch module connects rectification module, the first detection signal output terminal and the second detection signal output terminal, when DC voltage during greater than the cut-in voltage of electronic switch module, this electronic switch module conducting, so that this first detection signal output terminal is connected with this second detection signal output terminal, when DC voltage during less than the cut-in voltage of electronic switch module, this electronic switch module cut-off, so that disconnect between the first detection signal output terminal and the second detection signal output terminal.
2. microwave magnetron testing circuit as claimed in claim 1, it is characterized in that: the primary side of current transformer is connected between the primary side and live wire of transformer, and the secondary side of this current transformer connects rectification module and current sample module.
3. microwave magnetron testing circuit as claimed in claim 2, it is characterized in that: this current sample module is sampling resistor.
4. microwave magnetron testing circuit as claimed in claim 3, it is characterized in that: this sampling resistor is adjustable resistance.
5. microwave magnetron testing circuit as claimed in claim 4, it is characterized in that: this rectification module comprises the first diode and the second diode, one end of the secondary side of this current transformer connects the anode of the first diode, also by adjustable resistance, connect the first detection signal output terminal, the other end of the secondary side of current transformer connects the first detection signal output terminal, the negative electrode connecting electronic switch module of the first diode, the negative electrode that also connects the second diode, this first detection signal output terminal of the anodic bonding of this second diode.
6. microwave magnetron testing circuit as claimed in claim 5, it is characterized in that: electronic switch module is Darlington transistor, the negative electrode of this first diode connects the input end of Darlington transistor, the input end of this Darlington transistor also connects the first detection signal output terminal, and the output terminal of this Darlington transistor connects the second detection signal output terminal.
7. microwave magnetron testing circuit as claimed in claim 6, it is characterized in that: this microwave magnetron testing circuit also comprises a resistance, this resistance is connected between the input end of this first detection signal output terminal and Darlington transistor.
8. microwave magnetron testing circuit as claimed in claim 6, it is characterized in that: this microwave magnetron testing circuit also comprises a resistance, this resistance is connected between the input end of the negative electrode of diode and Darlington transistor.
9. microwave magnetron testing circuit as claimed in claim 6, it is characterized in that: this microwave magnetron testing circuit also comprises an electric capacity, this electric capacity is connected between the negative electrode of the first detection signal output terminal and this first diode.
10. microwave magnetron testing circuit as claimed in claim 6, it is characterized in that: this microwave magnetron testing circuit also comprises an electric capacity, this electric capacity is connected between the input end of the first detection signal output terminal and Darlington transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203290079U CN203287429U (en) | 2013-06-07 | 2013-06-07 | Microwave detection circuit used for magnetrons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203290079U CN203287429U (en) | 2013-06-07 | 2013-06-07 | Microwave detection circuit used for magnetrons |
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| Publication Number | Publication Date |
|---|---|
| CN203287429U true CN203287429U (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203290079U Expired - Lifetime CN203287429U (en) | 2013-06-07 | 2013-06-07 | Microwave detection circuit used for magnetrons |
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| CN (1) | CN203287429U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936346A (en) * | 2017-12-19 | 2019-06-25 | 关英怀 | The I/O mouthfuls of adjustable microwave therapy apparatus control devices of isolation power |
-
2013
- 2013-06-07 CN CN2013203290079U patent/CN203287429U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936346A (en) * | 2017-12-19 | 2019-06-25 | 关英怀 | The I/O mouthfuls of adjustable microwave therapy apparatus control devices of isolation power |
| CN109936346B (en) * | 2017-12-19 | 2023-04-14 | 关英怀 | Microwave therapeutic machine control device with adjustable I/O port isolation power |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Guangxi Dong edge tea industry Limited by Share Ltd Assignor: GUANGZHOU FUTAO MICROWAVE EQUIPMENT Co.,Ltd. Contract record no.: 2017990000018 Denomination of utility model: Microwave detection circuit used for magnetrons Granted publication date: 20131113 License type: Exclusive License Record date: 20170111 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |