CN201700036U - Protection circuit for open circuit - Google Patents
Protection circuit for open circuit Download PDFInfo
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- CN201700036U CN201700036U CN2010201733083U CN201020173308U CN201700036U CN 201700036 U CN201700036 U CN 201700036U CN 2010201733083 U CN2010201733083 U CN 2010201733083U CN 201020173308 U CN201020173308 U CN 201020173308U CN 201700036 U CN201700036 U CN 201700036U
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Abstract
The utility model discloses a protection circuit for an open circuit. The protection circuit for the open circuit comprises at least two load branch circuits of a constant-current drive circuit, and at least one open circuit protecting module, wherein the two connecting ends of the open circuit protecting module are connected with two ends with the same polarity of one pair of load branch circuits in at least two load branch circuits, and the other two ends with the same polarity of the pair of load branch circuits are equipotential; the open circuit protecting module detects the difference value of voltage between two ends connected with the open circuit protecting module, when the voltage difference value smaller than a pre-set difference value threshold is judged, the two ends are enabled to be under an off-state; and when the voltage difference value is not less than the pre-set difference value threshold is judged, the two ends are enabled to be under a short circuit state. The protection circuit for the open circuit achieves low cost, and has a wider scope of application.
Description
Technical Field
The utility model relates to a constant current drive technique especially relates to an open circuit protection circuit.
Background
The Light Emitting Diode (LED) constant current driving circuit with multi-path output generally comprises a constant current driving main circuit and at least two load branches, wherein each load branch is connected with at least one LED load in series. Because the load is a plurality of branches, in the constant current driving circuit, load current balance on the plurality of load branches needs to be realized, that is, the total current output by the constant current driving main circuit is distributed to each path of LED load according to the load requirement.
In practical application, different constant current driving main circuit implementation schemes generally exist for realizing load current balance on a load branch of an LED constant current driving circuit. In the LED constant current driving circuit shown in fig. 1, the dc blocking capacitor C1 connected in series to the secondary loop of the transformer T1 is used to achieve load current balance between the two load branches a1 and a 2; in the LED constant current driving circuit shown in fig. 2, a current sharing transformer T2 is used to achieve load current balancing on two load branches a1 and a 2; in the LED constant current driving circuit shown in fig. 3, load current balance between the two load branches a1 and a2 is achieved by the primary side series connection of the main transformers T3 and T4.
The three load current balancing schemes have a common characteristic: in two load branches of the LED constant current driving circuit, once an LED load on a certain load branch is opened, the load branch has an abnormal overvoltage phenomenon. If it is ensured that the LED load on a certain load branch is open-circuited, the LED loads on other load branches can still work normally, and an open-circuit protection circuit needs to be additionally added to the load branch.
A conventional open circuit protection circuit in the prior art is shown in fig. 4, and is respectively disposed on each load branch of the LED constant current driving circuit (only two load branches are shown in fig. 4), and each open circuit protection circuit respectively includes a thyristor (thyristor SCR shown in the figure) and two resistors (first resistor R1 and second resistor R2 shown in the figure). When overvoltage occurs to a certain load branch, the thyristor corresponding to the load branch is triggered to be conducted, and the load branch is short-circuited, so that normal work of the LED load on other load branches is guaranteed.
However, in the open-circuit protection circuit implemented by the way that the load branch is short-circuited by the thyristor, once an overvoltage phenomenon occurs, the impact current flowing through the thyristor is very large, so that a large-current thyristor needs to be selected in practical application, and the implementation cost of the open-circuit protection circuit is too high; moreover, if the main circuit of the LED constant current driving circuit adopts a BOOST topology structure, since the BOOST type circuits cannot directly perform load branch short circuit connection, the open circuit protection circuit cannot be applied to the LED constant current driving circuit, and the application range is small.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an open circuit protection circuit, which has a low cost and a wide application range.
Therefore, the embodiment of the utility model provides an adopt following technical scheme:
an embodiment of the utility model provides an open circuit protection circuit, include: at least two load branches of constant current drive circuit and at least one open circuit protection module, wherein:
two connecting ends of one open-circuit protection module are connected with two ends of a pair of load branches in the at least two load branches, which have the same polarity, and the other two ends of the pair of load branches, which have the same polarity, are equipotential;
the open circuit protection module detects a voltage difference value between two ends connected with the open circuit protection module, and when the voltage difference value is judged to be smaller than a preset difference threshold value, the two ends are in an open circuit state; and when the voltage difference is judged to be not less than the preset difference threshold value, the two ends are in a short-circuit state.
Wherein the open circuit protection module is realized by a pressure sensitive device.
The pressure sensitive device is: a voltage dependent resistor; and two ends of the piezoresistor are used as two connecting ends of the open-circuit protection module.
The voltage-sensitive device is a voltage regulator tube, and the open-circuit protection module comprises: the first voltage-stabilizing tube and the second voltage-stabilizing tube are voltage-stabilizing tubes with short circuit failure modes when bearing over-power; wherein,
and the anode of the first voltage-stabilizing tube and the anode of the second voltage-stabilizing tube are used as two connecting ends of the open-circuit protection module, and the cathode of the first voltage-stabilizing tube is connected with the cathode of the second voltage-stabilizing tube.
The open circuit protection module comprises a detection control unit and a processing unit, wherein,
the detection control unit detects a voltage difference value between two ends connected with the open-circuit protection module, and controls the processing unit to enable the two ends to be in an open-circuit state when the voltage difference value is judged to be smaller than a preset difference threshold value; when the voltage difference value is judged to be not smaller than a preset difference value threshold value, the processing unit is controlled to enable the two ends to be in a short-circuit state;
the processing unit enables the two ends connected with the open-circuit protection module to be in an open-circuit state or enables the two ends connected with the open-circuit protection module to be in a short-circuit state under the control of the detection control unit.
The detection control unit includes: a third voltage regulator tube, a fourth voltage regulator tube, a third resistor and a second capacitor; the processing unit includes: a bidirectional thyristor; wherein,
the T1 end and the T2 end of the bidirectional thyristor are used as two connecting ends of the open-circuit protection module; the anode of the third voltage-stabilizing tube and the anode of the fourth voltage-stabilizing tube are respectively connected with one of the T2 end and the G end of the bidirectional thyristor, and the cathode of the third voltage-stabilizing tube is connected with the cathode of the fourth voltage-stabilizing tube; the third resistor and the second capacitor are connected in parallel to the T1 terminal and the G terminal of the bidirectional thyristor.
The other two ends of the pair of load branches with the same polarity have equal potentials, and the specific implementation is as follows:
and the other two ends of the pair of load branches with the same polarity are directly connected.
The other two ends of the pair of load branches with the same polarity have equal potentials, and the specific implementation is as follows:
and the other two ends of the pair of load branches with the same polarity are grounded.
The other two ends of the pair of load branches with the same polarity have equal potentials, and the specific implementation is as follows:
the other two ends of the pair of load branches with the same polarity are respectively connected with a preset common voltage.
The constant current driving circuit is an LED constant current driving circuit.
The technical effect analysis of the technical scheme is as follows:
because the open-circuit protection module is connected between the two ends with the same polarity of the two load branches, the other two ends with the same polarity have the same potential, and when the voltage difference value between the two ends with the same polarity and the difference threshold value are in the size relationship, the open-circuit protection of the load branches is carried out, so that a high-current thyristor does not need to be selected as in the prior art, and the realization cost of the open-circuit protection circuit is reduced; in addition, the short-circuit output of the load branch is not carried out, so that the open-circuit protection circuit can also be suitable for a constant-current driving circuit based on a BOOST topological structure, and the application range is wider.
Drawings
FIG. 1 is a schematic diagram of a first implementation structure of a prior art LED constant current driving circuit;
FIG. 2 is a schematic diagram of a second implementation structure of a prior art LED constant current driving circuit;
FIG. 3 is a schematic diagram of a third implementation structure of a prior art LED constant current driving circuit;
FIG. 4 is a schematic diagram of an open-circuit protection circuit of a prior art LED constant current driving circuit;
fig. 5 is an exemplary diagram of a first implementation structure of an open-circuit protection circuit according to an embodiment of the present invention;
fig. 6 is an exemplary diagram of a first implementation structure of an open-circuit protection circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an implementation structure of a second open-circuit protection circuit according to an embodiment of the present invention;
fig. 8 is an exemplary diagram of a second implementation structure of an open-circuit protection circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an LED constant current driving circuit after the open circuit protection circuit of the present invention is used;
fig. 10 is another schematic diagram of an LED constant current driving circuit after the open circuit protection circuit of the present invention is used;
fig. 11 is a schematic diagram of another LED constant current driving circuit after the open circuit protection circuit is used;
fig. 12 is a schematic diagram of an LED constant current driving circuit based on a BOOST topology structure after the open-circuit protection circuit of the present invention is used.
Detailed Description
Hereinafter, the implementation of the open circuit protection circuit according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides an open circuit protection circuit includes: at least two load branches of constant current drive circuit and at least one open circuit protection module, wherein:
two connecting ends of one open-circuit protection module are connected with two ends of a pair of load branches in the at least two load branches, which have the same polarity, and the other two ends of the pair of load branches, which have the same polarity, are equipotential;
the open circuit protection module detects a voltage difference value between two ends connected with the open circuit protection module, and when the voltage difference value is judged to be smaller than a preset difference threshold value, the two ends are in an open circuit state; and when the voltage difference is judged to be not less than the preset difference threshold value, the two ends are in a short-circuit state.
The specific realization principle is as follows:
because the two ends with the same polarity of the two load branches are connected with the open-circuit protection module, the other two ends with the same polarity are equipotential, when the voltage difference value between the two ends with the same polarity is not less than the preset difference threshold value, the open-circuit overvoltage phenomenon of one load branch is shown, so that the open-circuit protection module shorts the two ends connected with the open-circuit protection module, the output of the open-circuit overvoltage load branch is clamped at the normal output of the other load branch, and the normally output load branch continues to keep the normal working state; therefore, the open-circuit protection is realized for the load branch circuit with the open-circuit overvoltage phenomenon, and the normal work of other load branch circuits is also kept.
In practical application, when the constant current driving circuit has a plurality of load branches, in order to realize open circuit protection for each load branch, each two adjacent load branches may be respectively used as the pair of load branches and correspond to one open circuit protection module; alternatively, each two load branches of the at least two load branches may be respectively used as the pair of load branches, and correspond to one open-circuit protection module. For example, the constant current driving circuit sequentially includes a load branch 1, a load branch 2, and a load branch 3, and then: taking the load branch 1 and the load branch 2 as a pair of load branches, and taking the load branch 2 and the load branch 3 as a pair of load branches; alternatively, it is also possible: the load branch 1 and the load branch 2 are regarded as a pair of load branches, the load branch 2 and the load branch 3 are regarded as a pair of load branches, and the load branch 1 and the load branch 3 are regarded as a pair of load branches.
The embodiment of the present invention provides an open circuit protection circuit, which can be applied not only to the LED constant current driving circuit shown in fig. 1 to fig. 3, but also to other LED constant current driving circuits, such as an LED constant current driving circuit based on a BOOST topology structure; moreover, this open circuit protection circuit can also be applicable to other constant current drive circuit that contains two at least load branch roads, for example, the constant current drive circuit that the main circuit topology structure of the LED constant current drive circuit shown in fig. 1-3 constitutes just can regard as the constant current drive circuit of other loads, at this moment, the utility model discloses an open circuit protection circuit still can regard as the open circuit protection circuit that corresponds constant current drive circuit, carry out the open circuit protection of each load branch road of constant current drive circuit.
In the open-circuit protection circuit shown in fig. 5, because an open-circuit protection module is connected between two ends of two load branches with the same polarity, and the other two ends with the same polarity are equipotential, the open-circuit protection module performs open-circuit protection of the two load branches by detecting whether the voltage difference between the two ends connected with the open-circuit protection module is smaller than the difference threshold, so that a large-current thyristor does not need to be selected as in the prior art, and the implementation cost of the open-circuit protection circuit is reduced; in addition, the short-circuit output of the load branch is not carried out, so that the open-circuit protection circuit can also be suitable for a constant-current driving circuit based on a BOOST topological structure, and the application range is wider.
The open circuit protection module may be implemented by different structures, listed below respectively:
the open circuit protection module can be realized by a pressure-sensitive device, such as a pressure-sensitive resistor and the like. For example, as shown in fig. 5, the two ends of the voltage-sensitive device are connected to the positive terminal of the first load branch a1 and the positive terminal of the second load branch a2 as the two connection terminals of the open-circuit protection module.
As shown in fig. 5, the negative terminal of the first load branch a1 is directly connected to the negative terminal of the second load branch a2, so as to ensure that the negative terminals of the two load branches are at the same potential. Or, in practical applications, the negative terminals of the two load branches may also be equipotential by grounding or a common level, which is not described herein.
Specifically, as shown in fig. 6, the voltage-sensitive device may also be a voltage regulator tube, and at this time, the open-circuit protection module may include: a first and a second voltage regulator ZD1 and ZD 2; the first voltage-stabilizing tube and the second voltage-stabilizing tube are voltage-stabilizing tubes with short circuit failure modes when bearing over-power; the cathode of the first voltage-stabilizing tube ZD1 is connected with the cathode of the second voltage-stabilizing tube ZD2, the anode of the first voltage-stabilizing tube ZD1 is used as the first connection end of the open-circuit protection module and is connected with the positive end of the first load branch A1, and the anode of the second voltage-stabilizing tube ZD2 is used as the second connection end of the open-circuit protection module and is connected with the positive end of the second load branch A2.
As shown in fig. 6, the negative terminal of the first load branch a1 and the negative terminal of the second load branch a2 are directly connected to ensure that the negative terminals of the two load branches are at the same potential. Or, in practical applications, the negative terminals of the two load branches may also be equipotential by grounding or a common level, which is not described herein.
Alternatively, as shown in fig. 7, the open circuit protection module may include a detection control unit and a processing unit, wherein,
the detection control unit is used for detecting a voltage difference value between two ends connected with the open-circuit protection module, judging the magnitude relation between the voltage difference value and a preset difference value threshold value, and controlling the two ends connected with the open-circuit protection module to be correspondingly short-circuited or switched off according to a judgment result;
specifically, the detection control unit is configured to control the processing unit to make the two ends in an open circuit state when the voltage difference is smaller than a preset difference threshold; and when the voltage difference is judged to be not less than the preset difference threshold value, the processing unit is controlled to enable the two ends to be in a short-circuit state.
And the processing unit is used for enabling the two ends connected with the open-circuit protection module to be in an open-circuit state or enabling the two ends connected with the open-circuit protection module to be in a short-circuit state under the control of the detection control unit.
The processing unit may be a bidirectional switch device, so as to turn off or short circuit two ends connected to the open-circuit protection module. The bidirectional switching device may be: a triac, etc.
Specifically, as shown in fig. 8, the negative terminal of the first load branch a1 is directly connected to the negative terminal of the second load branch a 2; the detection control unit includes: a third regulator ZD3, a fourth regulator ZD4, a third resistor R3 and a second capacitor C2; and the processing unit includes: a triac Q1. As shown in fig. 8, in which,
a T2 end of the bidirectional thyristor Q1 is used as a first connection end of the open-circuit protection module (detection control unit) and connected with the positive end of the first load branch a1, and a T1 end is used as a second connection end of the open-circuit protection module (detection control unit) and connected with the positive end of the second load branch a 2;
the cathode of the third voltage-stabilizing tube ZD3 is connected with the cathode of the fourth voltage-stabilizing tube ZD4, the anode of the third voltage-stabilizing tube ZD3 is connected with the T2 end of the bidirectional thyristor Q1, and the anode of the fourth voltage-stabilizing tube ZD4 is connected with the G end of the bidirectional thyristor Q1;
the third resistor R3 and the second capacitor C2 are connected in parallel to the T1 terminal and the G terminal of the triac Q1.
As shown in fig. 9-11, the embodiment of the present invention shown in fig. 7 is provided to implement a schematic structure of a circuit in which the open-circuit protection circuit is applied to two LED constant current driving circuits shown in fig. 1-3. As shown in fig. 9, in the LED constant current driving circuit, the dc blocking capacitor C1 connected in series to the secondary side loop of the transformer T1 realizes current balancing of the two load branches. As shown in fig. 10, in the LED constant current driving circuit, current balancing of two load branches is achieved through a current sharing transformer T2. As shown in fig. 11, in the LED constant current driving circuit, current balancing of two load branches is achieved through main transformers T3 and T4 in which primary windings are connected in series.
In addition, because in the utility model discloses in the open circuit protection circuit, need not carry out short-circuit treatment to the load branch road of constant current drive circuit, consequently, also can be applicable to the open circuit protection among the constant current drive circuit based on BOOST topological structure. As shown in fig. 12, a schematic structural diagram of an implementation of the open-circuit protection circuit applied to the LED constant current driving circuit based on the BOOST topology structure is given. As shown in fig. 12: the open circuit protection module is realized by a first voltage regulator tube ZD1 and a second voltage regulator tube ZD 2. The specific circuit structure is as follows:
the positive end of an input voltage Vin of the LED constant-current driving circuit is connected with the drain electrode of the switching tube Q2 through the inductor L, and the negative end of the input voltage Vin of the LED constant-current driving circuit is connected with the source electrode of the switching tube Q2; the dotted terminal of the first winding of the current sharing transformer T5 is connected with the drain of the switch tube Q2, and the non-dotted terminal is connected with the positive terminal of the first load branch A1 through a first diode D1; the non-dotted terminal of the second winding is connected with the drain of the switching tube Q2, and the dotted terminal is connected with the positive terminal of the second load branch a2 through a second diode D2; the source of the switching tube Q2 is grounded, and is connected to the negative terminal of the first load branch a1 and the negative terminal of the second load branch a2, respectively;
the first filter capacitor C3 is connected in series with the cathode of the first diode D1 and the source of the switching tube Q2; the second filter capacitor C4 is connected in series to the cathode of the second diode D2 and the source of the switching tube Q2.
Through the circuit structure, open-circuit protection of each load branch of the LED constant-current driving circuit based on the BOOST topological structure is realized.
In the circuit implementation of the above embodiment, the negative terminals in the two load branches are equal in potential, and the positive terminal is connected to the first connection terminal and the second connection terminal of the open-circuit protection module; in practical application, the positive ends of the two load branches may also be equipotential, and the negative ends are respectively connected to the first connection end and the second connection end of the open-circuit protection module. The specific implementation is similar to the above embodiments, and is not described here again.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An open circuit protection circuit, comprising: at least two load branches of constant current drive circuit and at least one open circuit protection module, wherein:
two connecting ends of one open-circuit protection module are connected with two ends of a pair of load branches in the at least two load branches, which have the same polarity, and the other two ends of the pair of load branches, which have the same polarity, are equipotential;
the open circuit protection module detects a voltage difference value between two ends connected with the open circuit protection module, and when the voltage difference value is judged to be smaller than a preset difference threshold value, the two ends are in an open circuit state; and when the voltage difference is judged to be not less than the preset difference threshold value, the two ends are in a short-circuit state.
2. The circuit of claim 1, wherein the open circuit protection module is implemented by a pressure sensitive device.
3. The circuit of claim 2, wherein the pressure sensitive device is: a voltage dependent resistor; and two ends of the piezoresistor are used as two connecting ends of the open-circuit protection module.
4. The circuit of claim 2, wherein the voltage dependent device is a voltage regulator tube, and the open circuit protection module comprises: the first voltage-stabilizing tube and the second voltage-stabilizing tube are voltage-stabilizing tubes with short circuit failure modes when bearing over-power; wherein,
and the anode of the first voltage-stabilizing tube and the anode of the second voltage-stabilizing tube are used as two connecting ends of the open-circuit protection module, and the cathode of the first voltage-stabilizing tube is connected with the cathode of the second voltage-stabilizing tube.
5. The circuit of claim 1, wherein the open circuit protection module comprises a detection control unit and a processing unit, wherein,
the detection control unit detects a voltage difference value between two ends connected with the open-circuit protection module, and controls the processing unit to enable the two ends to be in an open-circuit state when the voltage difference value is judged to be smaller than a preset difference threshold value; when the voltage difference value is judged to be not smaller than a preset difference value threshold value, the processing unit is controlled to enable the two ends to be in a short-circuit state;
the processing unit enables the two ends connected with the open-circuit protection module to be in an open-circuit state or enables the two ends connected with the open-circuit protection module to be in a short-circuit state under the control of the detection control unit.
6. The circuit of claim 5, wherein the detection control unit comprises: a third voltage regulator tube, a fourth voltage regulator tube, a third resistor and a second capacitor; the processing unit includes: a bidirectional thyristor; wherein,
the T1 end and the T2 end of the bidirectional thyristor are used as two connecting ends of the open-circuit protection module; the anode of the third voltage-stabilizing tube and the anode of the fourth voltage-stabilizing tube are respectively connected with one of the T2 end and the G end of the bidirectional thyristor, and the cathode of the third voltage-stabilizing tube is connected with the cathode of the fourth voltage-stabilizing tube; the third resistor and the second capacitor are connected in parallel to the T1 terminal and the G terminal of the bidirectional thyristor.
7. The circuit according to any one of claims 1 to 6, wherein the other two ends of the pair of load branches with the same polarity are equipotential implemented as:
and the other two ends of the pair of load branches with the same polarity are directly connected.
8. The circuit according to any one of claims 1 to 6, wherein the other two ends of the pair of load branches with the same polarity are equipotential implemented as:
and the other two ends of the pair of load branches with the same polarity are grounded.
9. The circuit according to any one of claims 1 to 6, wherein the other two ends of the pair of load branches with the same polarity are equipotential implemented as:
the other two ends of the pair of load branches with the same polarity are respectively connected with a preset common voltage.
10. The circuit according to any one of claims 1 to 6, wherein the constant current driving circuit is an LED constant current driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201733083U CN201700036U (en) | 2010-04-27 | 2010-04-27 | Protection circuit for open circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201733083U CN201700036U (en) | 2010-04-27 | 2010-04-27 | Protection circuit for open circuit |
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| CN201700036U true CN201700036U (en) | 2011-01-05 |
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| CN2010201733083U Expired - Lifetime CN201700036U (en) | 2010-04-27 | 2010-04-27 | Protection circuit for open circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238785A (en) * | 2010-04-27 | 2011-11-09 | 英飞特电子（杭州）有限公司 | Open circuit protection circuit |
| CN103427395A (en) * | 2012-05-21 | 2013-12-04 | 台达电子工业股份有限公司 | Open circuit protection circuit, open circuit protection method and lighting device |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
-
2010
- 2010-04-27 CN CN2010201733083U patent/CN201700036U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238785A (en) * | 2010-04-27 | 2011-11-09 | 英飞特电子（杭州）有限公司 | Open circuit protection circuit |
| CN103427395A (en) * | 2012-05-21 | 2013-12-04 | 台达电子工业股份有限公司 | Open circuit protection circuit, open circuit protection method and lighting device |
| CN103427395B (en) * | 2012-05-21 | 2017-03-01 | 台达电子工业股份有限公司 | Open circuit protection circuit, open circuit protection method and lighting device |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
| CN103926500B (en) * | 2014-04-22 | 2016-08-24 | 麦格纳（太仓）汽车科技有限公司 | The method realizing the detection of constant current driver circuit for LED performance |
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| CP01 | Change in the name or title of a patent holder |
Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: Inventronics (Hangzhou) Co., Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110105 Effective date of abandoning: 20131009 |
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| RGAV | Abandon patent right to avoid regrant |