CN201682646U - Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch - Google Patents
Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch Download PDFInfo
- Publication number
- CN201682646U CN201682646U CN2010201821154U CN201020182115U CN201682646U CN 201682646 U CN201682646 U CN 201682646U CN 2010201821154 U CN2010201821154 U CN 2010201821154U CN 201020182115 U CN201020182115 U CN 201020182115U CN 201682646 U CN201682646 U CN 201682646U
- Authority
- CN
- China
- Prior art keywords
- circuit
- bridge
- electromagnetic induction
- type electromagnetic
- current transformer
- 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
Links
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 title abstract description 8
- 230000006698 induction Effects 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 25
- 230000002159 abnormal effect Effects 0.000 description 10
- 238000007689 inspection Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Images
Landscapes
- General Induction Heating (AREA)
Abstract
The utility model discloses a bridge type electromagnetic induction heating circuit with a current transformer zero-voltage switch, comprising a current transformer, a bridge circuit, a power electromagnetic induction coil and an impulse controller, wherein the input end of the bridge circuit is connected with a direct-current power supply, an upper bridge arm of the bridge circuit is connected with the anode of the power supply, and a lower bridge arm thereof is connected with the cathode of the power supply; the power coil and the current transformer are connected in the output end of the bridge circuit in series, the upper bridge arm and the lower bridge arm at two sides of one or two output ends of the bridge arm circuit are respectively provided with an electronic switch, the impulse controller is provided with two paths of controlled impulse outputs which are respectively matched with the electronic switches of the upper bridge arm and the lower bridge arm, and the two paths controlled impulse output are connected with the control ends of the electronic switches. The impulse controller is adopted to drive the electronic switches to work at zero-voltage switch status, and as the power electromagnetic induction coil and the current transformer are connected in series, the controlled impulse can be closed and the electronic switches can be cut off rapidly in time even if unusual change of load or certain own fault of the circuit occurs, thus leading the circuit to have excellent working stability and reliability.
Description
Technical field
The utility model belongs to a kind of high performance inductive heating circuit, is specifically related to the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch.
Background technology
Known electromagnetic heater, its control circuit adopt single switch tuning circuit more, poor work stability, and heating power is low, and circuit structure limited big operating current, and it is required to satisfy more powerful heater.
Also there is other numerous devices to adopt half-bridge or full-bridge circuit; if but be applied in the induction heating equipment; its drive circuit to the protectiveness of load change and circuit abnormality do good inadequately, react fast inadequately, still there is bigger hidden danger in the security reliability of circuit.
The utility model content
The purpose of this utility model is to provide a kind of bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch; be applied in the induction heating equipment; change the insecure problem of protective circuit to solve in the prior art at electromagnetic water heater drive circuit and load, effectively improved circuit performance.
For achieving the above object, the utility model has adopted following technical scheme.
The bridge-type electromagnetic heating circuit of belt current control zero voltage switch, comprise current transformer, bridge circuit, power electromagnet induction coil and impulse controller, the input of bridge circuit connects DC power supply, brachium pontis connects positive source on it, it is brachium pontis connection power cathode down, power coil is connected with current transformer and is inserted the output of bridge circuit, the bridge circuit wherein upper and lower bridge arm of one group or two groups output is respectively equipped with electronic switch, impulse controller is provided with the electronic switch that upper and lower bridge arm is mated in the output of two-way controlled pulse respectively, and controlled pulse output is connected with the control end of electronic switch.It is controlled that the induced signal voltage that described current transformer produces is directly inputted to impulse controller, and impulse controller is judged a condition of pulse output according to this signal voltage.
Optionally, electronic switch is IGBT (insulated gate bipolar transistor) or MOSFET (field-effect transistor) or SCRs (one-way SCR).
As improvement of the technical scheme, electronic switch is parallel with slow shake electric capacity and fly-wheel diode.
A kind of improvement as technique scheme, bridge circuit is a half-bridge mode, comprise two groups of brachium pontis and two groups of brachium pontis of forming by electric capacity with electronic switch, electronic switch in the circuit, electric capacity, fly-wheel diode, power electromagnet induction coil and current transformer can be made up of single, also can or be composed in series, can also form by a plurality of connection in series-parallel by a plurality of parallel connections.
Another kind as technique scheme improves, bridge circuit is a full-bridge mode, comprise four groups of brachium pontis with electronic switch, electronic switch in the circuit, electric capacity, fly-wheel diode, power electromagnet induction coil and current transformer can be made up of single, also can or be composed in series, can also form by a plurality of connection in series-parallel by a plurality of parallel connections.
Compared with prior art; the beneficial effects of the utility model are: adopted the bridge-type resonant circuit; make electronic switch be operated in the state of zero voltage switching; simultaneously in power output coil loop, be in series with current transformer; in conjunction with impulse controller; make circuit have fine load abnormal and close function with the power circuit abnormal protection, thereby make equipment have good operation stability and reliability.
Description of drawings
Fig. 1 is the structural representation of embodiment one of the present utility model.
Fig. 2 is the structural representation of embodiment two of the present utility model.
Embodiment
Below in conjunction with specification drawings and specific embodiments the utility model is described further.
As shown in Figure 1, the electric bridge bridge arm circuit is a half-bridge mode among the embodiment one of the present utility model, circuit comprises five capacitor C 1, C2, C3, C4, C5, two electronic switch K1, K2, connect a diode D1, D2, a current transformer T1, a power electromagnet induction coil Power Coil, and impulse controller pulse control, C2, C3 series connection and in parallel with C1, connect DC power supply v+input and v-input from the C1 two ends, v+input and v-input are the DC power supply that is obtained by various single-phase civil powers or industrial three-phase alternating current rectification, the voltage that will claim the C1 two ends hereinafter is input voltage vin, C4, D1, K1 composes in parallel the last brachium pontis of electric bridge bridge arm circuit, C5, D2, K2 composes in parallel the following brachium pontis of electric bridge bridge arm circuit, from C2, between the C3 and C4, draw two outputs between the C5 respectively and be connected to the series circuit two ends that Power Coil and T1 form, pulsecontrol produces Channel A and the controlled pulse output of Channel B two-way by the circuit of relevant hardware circuit or software combined with hardware, Channel A is connected to the control end of K1, and Channel B is connected to the control end of K2.
For the ease of understanding, press the work schedule of impulse controller pulse control among the embodiment one below and further set forth the operation principle of diagram circuit.
(1) in the t0-t1 sequential, triggering K1 when Channel A has the input of signal high level opens, capacitor C 1, C2 charge to inductance Power Coil and C3, and the electric current among the inductance Power Coil rises, and the reason owing to charging causes the voltage at C3 two ends to raise simultaneously.At this moment, the voltage at K switch 2 and capacitor C 5 two ends is input voltage vin.
(2) in the t1-t2 sequential, K switch 1 is cancelled and is closed owing to driving voltage, and capacitor C 1, C2 continue inductance Power Coil and C3 are charged, and C4 is charged; At this moment, capacitor C 5 begins discharge, the discharging current of C5 also carries out positive charge to C3 and inductance Power Coil, forward current among the inductance Power Coil continues to rise, after the C5 discharge finishes, at this moment the voltage at K2 two ends equals the voltage at C5 two ends and is reduced to equal 0V, and the voltage at K1 and C4 two ends also rises to input voltage vin gradually along with fading away of C5 both end voltage so.C5 discharge off and D2 conducting, electric current among the inductance Power Coil continues charging via D2 to C3 at this moment, but the electric current among the inductance PowerCoil is on a declining curve at this moment, in D2 conduction period, impulse controller satisfies the first condition that Channel B opens, if at this moment open the purpose that K2 can reach zero voltage switching; The impulse controller circuit detects the current value in the current transformer simultaneously, when the electric current of impulse controller electric circuit inspection in current transformer no longer increases when simultaneously also being no more than predetermined coil current value, show circuit this moment and no abnormal, impulse controller also satisfies the second condition that Channel B opens; At this moment, impulse controller is opened K2; Can not satisfy if open the second condition of K2, impulse controller cuts out 2 road output control pulses at once, enters guard mode, thereby has reached the purpose of positive half cycle overcurrent or abnormal protection.
(3) in the t2-t3 sequential, because K2 opens, input voltage vin has been born at K1 and the C4 two ends of this moment, and electric current continues via D2 C3 to be charged among the inductance Power Coil, and C1 also charges to inductance Power Coil and C2, through after a while, K switch 2 continues conductings, and the electric current among the inductance Power Coil descends and when reducing to 0A, the reversing of inductance Power Coil, this moment, capacitor C 3 began inductance Power Coil is charged, and the electric current in the inductance begins negative sense to be increased.
(4) in the t3-t4 sequential, K switch 2 is cancelled and is closed owing to driving voltage, capacitor C 1, C3 continue inductance Power Coil is charged, and C5 charged, at this moment, capacitor C 4 begins discharge, the discharging current of C4 also carries out reverse charging to C2 and inductance Power Coil, electric current among the inductance Power Coil continues oppositely to rise, after the C4 discharge finishes, at this moment the voltage at K1 two ends equals the voltage at C4 two ends and is reduced to equal 0V, and the voltage at K2 and C5 two ends also rises to input voltage vin gradually along with the disappearance of C4 both end voltage so.C4 discharge off and D1 conducting, reverse current among the inductance Power Coil continues charging via D1 to C2 at this moment, but the reverse current among the inductance Power Coil is on a declining curve at this moment, in D1 conduction period, impulse controller satisfies the first condition that Channel A opens, if at this moment open the purpose that K1 can reach zero voltage switching; The impulse controller circuit detects the current value in the current transformer simultaneously, when the electric current of impulse controller electric circuit inspection in current transformer no longer increases when simultaneously also being no more than predetermined coil current value, show circuit this moment and no abnormal, impulse controller also satisfies the second condition that Channel A opens; At this moment, impulse controller is opened K1; Can not satisfy if open the second condition of K1, impulse controller cuts out output control pulse at once, enters guard mode, thereby has reached the purpose of negative half period overcurrent or abnormal protection.
(5) in the t4-t5 sequential, K switch 1 is opened, and K switch 2 and capacitor C 5 two ends reach input voltage vin.The moment of K1 conducting, inductance Power Coil continues C2 is charged, and through after a while, the current value negative sense among the inductance Power Coil reduces up to 0, and at this moment, the sense of current change among the inductance PowerCoil transfers forward flow to.
So far, entire circuit go round and begin again the circulation whole process.
As shown in Figure 2, the electric bridge bridge arm circuit is a full-bridge mode among the embodiment two of the present utility model, circuit comprises six capacitor C 1, C2, C3, C4, C5, C6, four switching device K1, K2, K3, K4, four diode D1, D2, D3, D4, a current transformer T1, a power electromagnet induction coil Power Coil, and impulse controller pulse control, connect voltage input end v+input and v-input from the C1 two ends, from C2, between the C3 and C4, draw the two ends that output is connected to power coil power coil between the C5 respectively, PowerCoil connects C4 with current transformer T1 and capacitor C 6 simultaneously, D2, K1 composes in parallel brachium pontis one, C2, D1, K3 composes in parallel brachium pontis two, C5, D3, K2 composes in parallel down brachium pontis one, C3, D4, K4 composes in parallel down brachium pontis two; Impulse controller pulse control produces Channel A and the controlled pulse output of Channel B two-way by relevant hardware circuit or hardware and software combined circuit, Channel A is connected to the control end of K1, K4, Channel B is connected to the control end of K2, K3, and current transformer T1, power inductance Power Coil, C6 are connected in series between the Bridge 2 arm.V+input and v-input are the DC power supply that is obtained by various single-phase civil powers or industrial three-phase alternating current rectification, and between v+input and v-input cross-over connection capacitor C 1, will claim the voltage at C1 two ends to be hereinafter: input voltage vin.
For the ease of understanding, press the work schedule of impulse controller among the embodiment two below and further set forth the operation principle of diagram circuit.
(1) in the t0-t1 sequential, when having high level signal to trigger, Channel A opens K switch 1, K4, capacitor C 1 couple of inductance Power Coil and capacitor C 6 are charged, electric current forward among the Power Coil rises, at this moment, the voltage at K switch 2 and capacitor C 5, K switch 3 and capacitor C 2 two ends is input voltage vin.
(2) in the t1-t2 sequential, the driving voltage that K switch 1, K4 export owing to impulse controller is cancelled and is closed, capacitor C 2, C5 continue inductance Power Coil and C6 are charged, and C3, C4 charged, electric current among the inductance Power Coil continues forward and rises, when D1, the D3 conducting then of C2, C5 discharge off, C3, C4 also charge to input voltage vin; At this moment, forward current among the inductance Power Coil is not the forward downward trend in increase, and in D1, D3 conduction period, the voltage at K2, K3 two ends is 0, impulse controller satisfies the first condition that Channel B opens, if at this moment open the purpose that K2, K3 can reach zero voltage switching; The impulse controller circuit detects the current value in the current transformer simultaneously, when the electric current of impulse controller electric circuit inspection in current transformer no longer increases when simultaneously also being no more than predetermined maximum current value, show circuit this moment and no abnormal, impulse controller also satisfies the second condition that Channel B opens; At this moment, impulse controller is opened K2, K3; Can not satisfy if open the second condition of K2, K3, impulse controller cuts out output control pulse at once, enters guard mode, thereby has reached the purpose of positive half cycle overcurrent or abnormal protection.
(3) in the t2-t3 sequential, K switch 2, K3 open, and the K switch 1 of this moment and the voltage at capacitor C 4, K switch 4 and capacitor C 3 two ends are input voltage vin, and electric current continues via D1, D3 C6 to be charged among the inductance Power Coil; Through after a while, K switch 2, K3 continue conducting, forward current among the inductance Power Coil descends and when reducing to 0A gradually, the sense of current of inductance Power Coil changes, at this moment, capacitor C 1 couple of inductance Power Coil and capacitor C 6 are carried out the negative sense charging, and the electric current among the inductance Power Coil is linear negative sense to be increased.Equally, the sense of current in the capacitor C 6 also flows for negative sense.
(4) in the t3-t4 sequential, K switch 2, K3 close, capacitor C 3, C4 continue inductance PowerCoil and C6 are carried out the negative sense charging, and C2, C5 charged, electric current among the inductance Power Coil continues negative sense and rises, when D2, the D4 conducting then of C3, C4 discharge off, C2, C5 also charge to input voltage vin; At this moment, negative current among the inductance Power Coil no longer increases and is the negative sense downward trend, and in D2, D4 conduction period, the voltage at K1, K4 two ends is 0, impulse controller satisfies the first condition that Channel B opens, if at this moment open the purpose that K1, K4 can reach zero voltage switching; The impulse controller circuit detects the current value in the current transformer simultaneously, when the electric current of impulse controller electric circuit inspection in current transformer no longer increases when simultaneously also being no more than predetermined coil current value, show circuit this moment and no abnormal, impulse controller also satisfies the second condition that Channel A opens; At this moment, impulse controller is opened K1, K4; Can not satisfy if open the second condition of K1, K4, impulse controller cuts out output control pulse at once, enters guard mode, thereby has reached the purpose of negative half period overcurrent or abnormal protection.
(5) in the t4-t5 sequential, K switch 1, K4 conducting, the voltage at K switch 2 and capacitor C 5, K switch 3 and capacitor C 2 two ends is input voltage vin.The moment of K1, K4 conducting, inductance Power Coil continues C2, C5 are charged, and through after a while, the electric current negative sense among the inductance Power Coil reduces until 0; At this moment, the sense of current among the inductance PowerCoil is changed into forward flow.
So far, entire circuit go round and begin again the circulation whole process.
The utility model can be applicable to multiple electromagnetic heater, such as the straight pipe type electromagnet water heater, the Power Coil of this circuit is wound on straight pipe outer wall, the centre is insulating barrier in addition, can in heating, make the Frequency Synchronization vibrations of water pipe, thereby obtain the ideal effect of no incrusted deposit with 5KHZ-500KHZ.
For a person skilled in the art, can obtain other various corresponding changes and distortion, and these all changes and distortion all belong to protection category of the present utility model according to structure and the principle that the utility model disclosed.
Claims (7)
1. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch, it is characterized in that: comprise current transformer, bridge circuit, power electromagnet induction coil and impulse controller, the input of bridge circuit connects DC power supply, brachium pontis connects positive source on it, it is brachium pontis connection power cathode down, power coil is connected with current transformer and is inserted the output of bridge circuit, the bridge circuit wherein upper and lower bridge arm of one group or two groups output is respectively equipped with electronic switch, impulse controller is provided with the electronic switch that upper and lower bridge arm is mated in the output of two-way controlled pulse respectively, and controlled pulse output is connected with the control end of electronic switch.
2. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 1 is characterized in that: electronic switch is IGBT (insulated gate bipolar transistor) or MOSFET (field-effect transistor) or SCRs (one-way SCR).
3. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 1 and 2 is characterized in that: electronic switch is parallel with slow shake electric capacity and fly-wheel diode.
4. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 3 is characterized in that: bridge circuit is a half-bridge mode, comprises two groups of brachium pontis and two groups of brachium pontis of being made up of electric capacity with electronic switch.
5. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 4, it is characterized in that: the electronic switch in the circuit, electric capacity, fly-wheel diode, power electromagnet induction coil and current transformer can be made up of single, also can or be composed in series, can also form by a plurality of connection in series-parallel by a plurality of parallel connections.
6. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 3 is characterized in that: bridge circuit is a full-bridge mode, comprises four groups of brachium pontis with electronic switch.
7. the bridge-type electromagnetic induction heater circuit of belt current instrument transformer zero voltage switch according to claim 6, it is characterized in that: the electronic switch in the circuit, electric capacity, fly-wheel diode, power electromagnet induction coil and current transformer can be made up of single, also can or be composed in series, can also form by a plurality of connection in series-parallel by a plurality of parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201821154U CN201682646U (en) | 2010-04-29 | 2010-04-29 | Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201821154U CN201682646U (en) | 2010-04-29 | 2010-04-29 | Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201682646U true CN201682646U (en) | 2010-12-22 |
Family
ID=43347677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201821154U Expired - Fee Related CN201682646U (en) | 2010-04-29 | 2010-04-29 | Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201682646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115754657A (en) * | 2022-11-24 | 2023-03-07 | 国网江苏省电力有限公司苏州供电分公司 | Serial power module test system and test method |
-
2010
- 2010-04-29 CN CN2010201821154U patent/CN201682646U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115754657A (en) * | 2022-11-24 | 2023-03-07 | 国网江苏省电力有限公司苏州供电分公司 | Serial power module test system and test method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100496849C (en) | High frequency inverted direct-current spot-welding power supply device and its application | |
| CN101854120B (en) | High-efficiency multifunctional flyback converter | |
| CN107493025B (en) | A kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter | |
| CN103701357B (en) | Digital variable frequency defibrillator and variable frequency pulse control method thereof | |
| CN102035378A (en) | All solid state high-voltage power supply with positive and negative pulse outputs | |
| CN102751793A (en) | Wireless power transfer system based on bilateral power flow control and control method thereof | |
| CN107147296A (en) | A kind of band pulls down the isolated form DC DC booster converters of active clamp branch road | |
| CN204518108U (en) | Electromagnetic Heating control circuit and electromagnetic appliance | |
| CN102548074B (en) | Single-tube resonance soft switch circuit of induction cooker and control method thereof | |
| CN107147298B (en) | A kind of microwave oven magnetic power supply device with pull-up active clamp branch | |
| CN1109654A (en) | Combined control inverse method of pulse width modulation and zero current zero voltage harmonic switch | |
| CN105978372B (en) | A kind of topological circuit and half-bridge topology circuit and three phase full bridge topological circuit | |
| CN109412420A (en) | Two-way isolation DC/DC circuit and its control method of use | |
| CN201682646U (en) | Bridge type electromagnetic induction heating circuit with current transformer zero-voltage switch | |
| CN202425086U (en) | Single-tube resonant soft switch circuit of induction cooker | |
| CN104900926A (en) | High-frequency resonance-type lead-acid storage battery repair apparatus and high-frequency resonance-type lead-acid storage battery repair method | |
| CN204887506U (en) | Electromagnetic heater | |
| CN104242666A (en) | Novel inverter welding power supply | |
| CN107172733A (en) | A kind of electromagnetic heating system and its method of work | |
| CN205864273U (en) | A kind of ozonator high frequency inverter | |
| Cerezo | IGBT Definition for single ended induction heating cookers | |
| CN109194136A (en) | It is a kind of to reduce two-way LLC converter transformer magnetic saturation control method | |
| CN204993919U (en) | Electromagnetic heating device | |
| CN204376748U (en) | The high frequency power source of resonance manifold type wireless electric energy transmission device | |
| CN106411105B (en) | A kind of soft switch circuit topology based on capacitor charge and discharge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN HAODONG ENERGY SAVING TECHNOLOGY CO., LTD Free format text: FORMER OWNER: LI YUEGANG Effective date: 20120528 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 410400 YUEYANG, HUNAN PROVINCE TO: 518100 SHENZHEN, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120528 Address after: 518100 Guangdong province Shenzhen city Longhua District Zehua Meron road building room 1701 Patentee after: Shenzhen Haodong Energy-Saving Technology Co., Ltd. Address before: 410400, No. three, 158, Chengguan Town, Chengguan County, Hunan, Pingjiang Patentee before: Li Yuegang |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20150429 |
|
| EXPY | Termination of patent right or utility model |