CN203167355U - LED driver preventing LED from flickering - Google Patents
LED driver preventing LED from flickering Download PDFInfo
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- CN203167355U CN203167355U CN 201320103223 CN201320103223U CN203167355U CN 203167355 U CN203167355 U CN 203167355U CN 201320103223 CN201320103223 CN 201320103223 CN 201320103223 U CN201320103223 U CN 201320103223U CN 203167355 U CN203167355 U CN 203167355U
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- 229910052754 neon Inorganic materials 0.000 claims abstract description 24
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004065 semiconductor Substances 0.000 claims abstract description 11
- 239000003381 stabilizer Substances 0.000 claims description 51
- 230000001131 transforming effect Effects 0.000 claims description 42
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 11
- 230000009466 transformation Effects 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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Abstract
The utility model relates to an LED driver preventing an LED from flickering. The LED driver comprises a rectification circuit, a filter circuit, a switch transformation circuit, a PWM chip, a VCC power supply circuit, and a feedback circuit. The LED driver further comprises a starting control circuit used for enabling voltage of a power supply input terminal of the PWM chip to be lower than a starting threshold voltage thereof when output voltage of the filter circuit is lower than critical voltage and for enabling the voltage of the power supply input terminal of the PWM chip to be higher than or equal to the starting threshold voltage thereof and maintaining the constancy of the voltage of the power supply input terminal of the PWM chip when the output voltage of the filter circuit is higher than or equal to the critical voltage. The starting control circuit is additionally arranged between an output terminal of the filter circuit and the power supply input terminal of the PWM chip, thereby effectively preventing an LED module from flickering when a neon bulb indicating lamp switch member or a semiconductor switch member is in a disconnected state.
Description
Technical field
The utility model relates to a kind of led driver.
Background technology
Along with the LED illumination is popularized all over the world, along with the continuous development of science and technology, the auxiliary products of LED are various in style, and two kinds of switches of its market user application terminal can influence the use of led driver.
As shown in Figure 2, a kind of is neon bulb indicator light switch device, and its inner neon bulb lamp EN comes the state that switches on and off of indicator cock as luminous element; As shown in Figure 3, another kind is semiconductor switch, and its controllable silicon SCR that adopt are made the break-make device more, and its inner indicator light LD is as the state that switches on and off of indicator cock.
As shown in Figure 1, existing led driver comprises rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits and feedback circuit, and the output of filter circuit is connected with the power input of PWM chip.
In conjunction with shown in Figure 1, if during neon bulb indicator light switch device series connection control led driver, concrete defective is: when switch A point is got to the B point (switch disconnects led driver and civil power), N or the L(civil power of the loop of led driver for exchanging)-A point-B point-neon bulb lamp EN-resistance R X-Output(output)-led driver rectification circuit formation loop, EN is luminous for the neon bulb lamp, because resistance R X resistance is very big, it is 1 megohm, about the electric current 100uA that approximately flows through, led driver can not obtain enough load capacities, circuit is open-circuit condition, but the power input VCC of the PWM chip of led driver is the output that is connected on the filter circuit after the rectification, in this case, the weak current that neon bulb indicator light switch device produces can charge to filter circuit, may reach the startup threshold voltage of PWM chip within a certain period of time, so, will cause the work suddenly of PWM chip, the switch transforming circuit makes the LED module once bright, yet, the weak current that neon bulb indicator light switch device produces is not enough to replenish the electric energy that filter circuit consumes at once, be that filter circuit is not enough to keep the PWM chip and works always, switch transforming circuit energy is not enough, the LED module extinguishes again, that is to say, the entire circuit system is starting--closes constantly circulation under--startup---closing state, so regular LED module scintillation just occurs, cause uncomfortable sensation to human eye.When switch is got to the C point by the A point (switch is connected led driver and civil power), led driver obtains enough energy work, neon bulb lamp EN and resistance R X are not just passed through in the loop of this moment, luminous neon bulb indicator light circuit becomes off state, neon bulb lamp EN does not work, and led driver operate as normal band carries.
In conjunction with shown in Figure 1, if during semiconductor switch device series connection control led driver, because controllable silicon SCR has semi-conductive characteristic, do not drive at control end C under the situation of signal, the input and output of controllable silicon SCR still have faint electric current to flow through, though this electric current can not allow the load normal foot browband of led driver carry work, but be enough to allow the PWM chip of led driver get electric starting, just as neon bulb indicator light switch device, when switch off state, the LED module causes very uncomfortable sensation the on and off that do not stop (being scintillation) to human eye, also influences the life-span of light fixture further.
The utility model content
The purpose of this utility model is to propose a kind of led driver of the LED of preventing flicker, and it can solve neon bulb indicator light switch device and semiconductor switch device when off-state, causes the LED module problem of scintillation to occur.
In order to achieve the above object, the technical scheme that adopts of the utility model is as follows:
A kind of led driver that prevents the LED flicker, it comprises rectification circuit, filter circuit, the switch transforming circuit, the PWM chip, the VCC power supply circuits, feedback circuit, the output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with second input of switch transforming circuit, the power input of PWM chip is connected with the VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, the VCC power supply circuits, feedback circuit all is connected with the feedback output end of switch transforming circuit, the power supply output of switch transforming circuit is connected with a LED module, and described rectification circuit is electrically connected with the city by a neon bulb indicator light switch device or semiconductor switch device.It comprises that also one starts control circuit, the input that starts control circuit is connected with the output of filter circuit, the output that starts control circuit is connected with the power input of PWM chip, when described startup control circuit is used for output voltage when filter circuit less than critical voltage, make the voltage of the power input of PWM chip start threshold voltage less than it, and when being used for output voltage when filter circuit more than or equal to critical voltage, make the voltage of the power input of PWM chip start threshold voltage more than or equal to it, and make the voltage constant of the power input of PWM chip.
Preferably, in order further to consume the weak current that switching device produces when the off-state, rectification circuit and the clamped circuit of an energy are connected in parallel, and the clamped circuit of described energy is connected between neon bulb indicator light switch device or semiconductor switch device and the rectification circuit.Described energy clamping circuit comprises resistance R 6, resistance R 7, and resistance R 6 is connected in series with resistance R 7.
Optionally, described startup control circuit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 8, resistance R 9, resistance R 10, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, voltage-stabiliser tube ZD5, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 8 serial connections, resistance R 1 is connected by the collector electrode of resistance R 11 with triode Q1 with connected node between the resistance R 2, the collector electrode of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, connected node between resistance R 2 and the resistance R 8 is successively by voltage-stabiliser tube ZD5, resistance R 9 is connected with the base stage of triode Q1, the emitter of triode Q1 is connected with the base stage of triode Q2, the base stage of triode Q2 is by resistance R 10 ground connection, resistance R 3, resistance R 4, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected in series successively, the emitter of triode Q2 is connected between voltage-stabiliser tube ZD2 and the voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected with the power input of PWM chip, and the collector electrode of triode Q2 is connected between the power input of voltage-stabiliser tube ZD4 and PWM chip; Wherein, resistance R 8 ground connection, the connected node of resistance R 1 and resistance R 3 is as the input that starts control circuit, and the connected node of triode Q2 and voltage-stabiliser tube ZD4 is as the output that starts control circuit.
Optionally, described switch transforming circuit comprises transformer T1, and the RCD that is connected with the elementary winding of transformer T1 absorbs circuit, the LED module power supply circuits that are connected with the secondary winding of transformer T1; LED module power supply circuits are as the power supply output of switch transforming circuit; RCD absorbs an end of circuit as the first input end of switch transforming circuit, and RCD absorbs the other end of circuit as second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.
Optionally, described VCC power supply circuits comprise diode D4, capacitor C 4, resistance R 15, the negative pole of diode D4 is connected with the power input of PWM chip, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input of PWM chip is respectively by capacitor C 4, resistance R 15 ground connection.
Optionally, described feedback circuit comprises resistance R 13, resistance R 16, resistance R 14, resistance R 13 is connected in series with resistance R 16 and forms first series arm, first series arm is connected with the feedback output end of switch transforming circuit, the voltage detecting end of the feedback input end of PWM chip is connected between resistance R 13 and the resistance R 16, and the current detecting end of the feedback input end of PWM chip is by resistance R 14 ground connection.
Optionally, described critical voltage is 150V.
The utlity model has following beneficial effect:
Between the power input of the output of filter circuit and PWM chip, increase by one and start control circuit, when preventing that effectively neon bulb indicator light switch device or semiconductor switch device are in off-state, the scintillation that the LED module occurs.Owing to prevented the appearance of scintillation, thereby can prolong the useful life of LED module, led driver, and the reliability that improves led driver.
Description of drawings
Fig. 1 is the application schematic diagram of the led driver of prior art;
Fig. 2 is the structural representation of the neon bulb indicator light switch device of prior art;
Fig. 3 is the structural representation of the semiconductor switch device of prior art;
Fig. 4 is the application principle schematic diagram of the led driver that prevents the LED flicker of the utility model preferred embodiment;
Fig. 5 is the electrical block diagram of the led driver that prevents the LED flicker of the utility model preferred embodiment.
Reference numeral: 10, the clamped circuit of energy; 20, rectification circuit; 30, start control circuit; 40, switch transforming circuit; 50, RCD absorbs circuit; 60, LED module.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further.
As shown in Figure 4, be example with the led driver that prevents LED flicker of the present embodiment application circuit that formation controls the light on and off of LED module of connect with neon bulb indicator light switch device, describe.
A kind of led driver that prevents the LED flicker, it comprises the clamped circuit of energy, rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits, feedback circuit and startup control circuit.
The output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with second input of switch transforming circuit, the power input of PWM chip is connected with the VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, VCC power supply circuits, feedback circuit all are connected with the feedback output end of switch transforming circuit, and the power supply output of switch transforming circuit is connected with a LED module.
Described rectification circuit is electrically connected with the city by the clamped circuit of energy, neon bulb indicator light switch device successively, the clamped circuit of rectification circuit and energy is connected in parallel, the weak current that the clamped circuit of described energy produces when being used for consuming neon bulb indicator light switch device off-state.
The input that starts control circuit is connected with the output of filter circuit, and the output that starts control circuit is connected with the power input of PWM chip.
When described startup control circuit is used for output voltage when filter circuit less than critical voltage, make the voltage of the power input of PWM chip start threshold voltage less than it, namely the PWM chip is not worked; And when being used for output voltage when filter circuit more than or equal to critical voltage, make the voltage of the power input of PWM chip start threshold voltage more than or equal to it, and make the voltage constant of the power input of PWM chip, namely the PWM chip is worked under stable voltage environment.
As shown in Figure 5, be the concrete circuit structure of led driver that prevents LED flicker of present embodiment.The two ends of the clamped circuit 10 of energy (wherein an end is by fuse F1) are connected with L end, the N end of civil power respectively, and described civil power is 96-265V AC.
The rectifier bridge of rectification circuit 20 for being connected and composed by four diodes.
The clamped circuit 10 of energy comprises resistance R 6, resistance R 7, and resistance R 6 is connected in series with resistance R 7.
Filter circuit is made of a filter capacitor C1.
Switch transforming circuit 40 comprises transformer T1, and the RCD that is connected with the elementary winding of transformer T1 absorbs circuit 50, the LED module power supply circuits that are connected with the secondary winding of transformer T1.LED module power supply circuits are as the power supply output of switch transforming circuit, described LED module power supply circuits comprise diode D1, capacitor C 3, resistance R 12, resistance R 12 is connected in parallel with capacitor C 3 and forms first parallel branch, diode D1 is connected in series with first parallel branch, and forming the loop with the secondary winding of transformer T1, the two ends of resistance R 12 are as the power supply output of LED module 60.RCD absorbs an end of circuit 50 as the first input end of switch transforming circuit, and RCD absorbs the other end of circuit 50 as second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.General, RCD absorbs circuit 50 and comprises capacitor C 2, resistance R 5 and diode D3, capacitor C 2 is connected in parallel with resistance R 5 and forms second parallel branch, diode D3 is connected with second parallel branch and forms the loop with the elementary winding of transformer T1, one link of capacitor C 2 and resistance R 5 is as the first input end of switch transforming circuit, be connected with the positive pole of filter capacitor C1, the positive pole of diode D3 is as second input of switch transforming circuit, and the positive pole of diode D3 is connected with the drive end DRAIN of PWM chip U1.
The VCC power supply circuits comprise diode D4, capacitor C 4, resistance R 15, the negative pole of diode D4 is connected with the power input VCC of PWM chip U1, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input VCC of PWM chip U1 is respectively by capacitor C 4, resistance R 15 ground connection.
Feedback circuit comprises resistance R 13, resistance R 16, resistance R 14, resistance R 13 is connected in series with resistance R 16 and forms first series arm, first series arm is connected with the feedback output end of switch transforming circuit, namely an end of first series arm is connected with the positive pole of diode D4, the other end ground connection of first series arm, the voltage detecting end FB of the feedback input end of PWM chip U1 is connected between resistance R 13 and the resistance R 16, and the current detecting end CS of the feedback input end of PWM chip U1 is by resistance R 14 ground connection.
By the particular circuit configurations of the led driver that prevents LED flicker of present embodiment as can be known, the emphasis of present embodiment improves and is to have increased the clamped circuit 10 of energy and starts control circuit 30.
PWM chip U1 is by starting control circuit 30 power supplies, owing to start in the control circuit 30 and be serially connected with voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, arrive the voltage clamper of filter capacitor C1 output below the startup threshold voltage of PWM chip U1, different PWM chip U1 have different startup threshold voltages, only need to ration the power supply according to the enabling gate of PWM chip U1 to compress into the line parameter design and get final product.
For example, the civil power of the led driver of present embodiment access is 96-265V AC.Suppose that critical voltage is 150V.When neon bulb indicator light switch device is in off-state, when the voltage on the filter capacitor C1 is lower than 150V, triode Q1 conducting, and make triode Q2 conducting for bias voltage of triode Q2, thereby, triode Q2 is voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 short circuit, thereby the voltage on the capacitor C 4 is maintained below the startup threshold voltage of PWM chip U1, and PWM chip U1 can't obtain enough energy work; When the voltage on the filter capacitor C1 is higher than 150V, because the collector electrode of triode Q1 is by a voltage-stabiliser tube ZD1 ground connection, be trapped among before the voltage with triode Q1 collector electrode in the certain voltage scope, so the voltage on the filter capacitor C1 is in the 96-265V excursion, voltage on the filter capacitor C4 can not become, thereby can adapt to the full voltage range input automatically.
Present embodiment is that example describes with neon bulb indicator light switch device only, and present embodiment can solve the LED flicker problem that semiconductor switch device brings equally when disconnecting.
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 distortion should belong within the protection range of the utility model claim all.
Claims (8)
1. led driver that prevents LED flicker, it comprises rectification circuit, filter circuit, the switch transforming circuit, the PWM chip, the VCC power supply circuits, feedback circuit, the output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with second input of switch transforming circuit, the power input of PWM chip is connected with the VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, the VCC power supply circuits, feedback circuit all is connected with the feedback output end of switch transforming circuit, the power supply output of switch transforming circuit is connected with a LED module, described rectification circuit is electrically connected with the city by a neon bulb indicator light switch device or semiconductor switch device, it is characterized in that, comprise that also one starts control circuit, the input that starts control circuit is connected with the output of filter circuit, the output that starts control circuit is connected with the power input of PWM chip, when described startup control circuit is used for output voltage when filter circuit less than critical voltage, make the voltage of the power input of PWM chip start threshold voltage less than it, and when being used for output voltage when filter circuit more than or equal to critical voltage, make the voltage of the power input of PWM chip start threshold voltage more than or equal to it, and make the voltage constant of the power input of PWM chip.
2. the led driver that prevents the LED flicker as claimed in claim 1 is characterized in that rectification circuit and an energy clamping circuit are connected in parallel, and described energy clamping circuit is connected between neon bulb indicator light switch device or semiconductor switch device and the rectification circuit.
3. the led driver that prevents the LED flicker as claimed in claim 2 is characterized in that described energy clamping circuit comprises resistance R 6, resistance R 7, and resistance R 6 is connected in series with resistance R 7.
4. the led driver that prevents LED flicker as claimed in claim 1, it is characterized in that, described startup control circuit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 8, resistance R 9, resistance R 10, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, voltage-stabiliser tube ZD5, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 8 serial connections, resistance R 1 is connected by the collector electrode of resistance R 11 with triode Q1 with connected node between the resistance R 2, the collector electrode of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, connected node between resistance R 2 and the resistance R 8 is successively by voltage-stabiliser tube ZD5, resistance R 9 is connected with the base stage of triode Q1, the emitter of triode Q1 is connected with the base stage of triode Q2, the base stage of triode Q2 is by resistance R 10 ground connection, resistance R 3, resistance R 4, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected in series successively, the emitter of triode Q2 is connected between voltage-stabiliser tube ZD2 and the voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected with the power input of PWM chip, and the collector electrode of triode Q2 is connected between the power input of voltage-stabiliser tube ZD4 and PWM chip; Wherein, resistance R 8 ground connection, the connected node of resistance R 1 and resistance R 3 is as the input that starts control circuit, and the connected node of triode Q2 and voltage-stabiliser tube ZD4 is as the output that starts control circuit.
5. the led driver that prevents LED flicker as claimed in claim 1, it is characterized in that, described switch transforming circuit comprises transformer T1, and the RCD that is connected with the elementary winding of transformer T1 absorbs circuit, the LED module power supply circuits that are connected with the secondary winding of transformer T1; LED module power supply circuits are as the power supply output of switch transforming circuit; RCD absorbs an end of circuit as the first input end of switch transforming circuit, and RCD absorbs the other end of circuit as second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.
6. the led driver that prevents LED flicker as claimed in claim 1, it is characterized in that, described VCC power supply circuits comprise diode D4, capacitor C 4, resistance R 15, the negative pole of diode D4 is connected with the power input of PWM chip, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input of PWM chip is respectively by capacitor C 4, resistance R 15 ground connection.
7. the led driver that prevents LED flicker as claimed in claim 1, it is characterized in that, described feedback circuit comprises resistance R 13, resistance R 16, resistance R 14, resistance R 13 is connected in series with resistance R 16 and forms first series arm, first series arm is connected with the feedback output end of switch transforming circuit, the voltage detecting end of the feedback input end of PWM chip is connected between resistance R 13 and the resistance R 16, and the current detecting end of the feedback input end of PWM chip is by resistance R 14 ground connection.
8. as each described led driver that prevents the LED flicker of claim 1-7, it is characterized in that described critical voltage is 150V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103223 CN203167355U (en) | 2013-03-06 | 2013-03-06 | LED driver preventing LED from flickering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103223 CN203167355U (en) | 2013-03-06 | 2013-03-06 | LED driver preventing LED from flickering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203167355U true CN203167355U (en) | 2013-08-28 |
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ID=49028503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320103223 Withdrawn - After Issue CN203167355U (en) | 2013-03-06 | 2013-03-06 | LED driver preventing LED from flickering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203167355U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200735A (en) * | 2013-03-06 | 2013-07-10 | 广州凯盛电子科技有限公司 | Light-emitting diode (LED) actuator preventing LED from flickering |
| CN114205965A (en) * | 2021-11-24 | 2022-03-18 | 广东新昇电业科技股份有限公司 | Circuit for preventing LED from flickering during starting |
-
2013
- 2013-03-06 CN CN 201320103223 patent/CN203167355U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200735A (en) * | 2013-03-06 | 2013-07-10 | 广州凯盛电子科技有限公司 | Light-emitting diode (LED) actuator preventing LED from flickering |
| CN103200735B (en) * | 2013-03-06 | 2015-04-15 | 广州凯盛电子科技有限公司 | Light-emitting diode (LED) actuator preventing LED from flickering |
| CN114205965A (en) * | 2021-11-24 | 2022-03-18 | 广东新昇电业科技股份有限公司 | Circuit for preventing LED from flickering during starting |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zeng Weijian Inventor after: Tu Daoping Inventor before: Tu Daoping |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: TU DAOPING TO: CENG WEIJIAN TU DAOPING |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130828 Effective date of abandoning: 20150415 |
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| RGAV | Abandon patent right to avoid regrant |