CN202633927U - Surge current inhibition circuit and LED (light-emitting diode) dimming system thereof - Google Patents
Surge current inhibition circuit and LED (light-emitting diode) dimming system thereof Download PDFInfo
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- CN202633927U CN202633927U CN 201220299731 CN201220299731U CN202633927U CN 202633927 U CN202633927 U CN 202633927U CN 201220299731 CN201220299731 CN 201220299731 CN 201220299731 U CN201220299731 U CN 201220299731U CN 202633927 U CN202633927 U CN 202633927U
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Abstract
The utility model discloses a surge current inhibition circuit and an LED (light-emitting diode) dimming system fabricated with the same. The surge current inhibition circuit comprises an impedance element, a first switching element, a current detection circuit and a control circuit; two non-control ends of the first switching element are connected in parallel with the impedance element and then connected with a load loop; the current detection circuit is used for detecting loop current flowing through the impedance element or the first switching element; and the control circuit is connected with the control end of the first switching element, receives the loop current signal of the current detection circuit, and is used for controlling the connection between the impedance element or the first switching element and the load loop. The LED dimming system comprises an LED lamp, an LED drive circuit, the surge current inhibition circuit, a rectification circuit and a dimmer. The surge current inhibition circuit can inhibit the surge current of an electronic loop. The LED dimming system can protect the electronic elements, and therefore can stably operate.
Description
Technical field
The utility model relates to electronic technology field, the LED light adjusting system of particularly a kind of circuit for limiting surge current and making thereof.
Background technology
Since century, illuminating industry is relied on incandescent lamp bulb always more than one.Incandescent lamp uses simply and very suitable light modulation.Controllable silicon dimmer just can be realized incandescent lamp is carried out light modulation at an easy rate.Nowadays, the LED illumination has become a mainstream technology.LED flashlight, traffic lights and car light etc. can be found everywhere, and each country is promoting with incandescent lamp and fluorescent lamp in LED lamp replacement dwelling house, the commercial and industrial application.After using high energy efficiency LED illumination instead, the energy saving amount of realization will be very surprising.
Be seen everywhere because be fit to the controllable silicon dimmer of incandescent lamp, the LED lamp wants real achieving success and a large amount of with its replacement, just must be able to use existing dimmer and circuit to realize light modulation.
Yet ironic is that the poor efficiency of incandescent lamp and the high input current of generation just thereupon are only the good principal element of controllable silicon dimmer work.The thermal inertia of filament also helps to cover any instability or the vibration that dimmer produces in the incandescent lamp bulb.In a large amount of problems of attempting the LED lamp carried out running in the process of light modulation, all follow the dimmer unstable working condition relevant.Want to understand fully reason, at first be necessary to understand operation principle, LED lamp technology and the correlation between them of controllable silicon dimmer.
Fig. 1 is the schematic diagram of the LED light adjusting system of prior art; As shown in Figure 1, this LED light adjusting system comprises AC power, led driver, several LED; And be connected the dimmer between AC power and the led driver; Said dimmer comprises bidirectional triode thyristor Q10 and the circuits for triggering that are used to control bidirectional triode thyristor Q10, and said circuits for triggering comprise variable resistor R10, capacitor C 10, bidirectional diode DB30.Its control principle is: through regulating the resistance of variable resistor R10; To change the charging interval of capacitor C 10; Thereby change the controllable silicon Q10 angle of flow through bidirectional diode DB30, with the ON time of control controllable silicon Q10, through the input voltage of the chopping voltage V1 behind the controllable silicon Q10 as led driver; Led driver is controlled the size of output current according to the variation at the copped wave angle of chopping voltage V1, thereby reaches the purpose of LED being carried out light modulation.
Fig. 2 is the oscillogram of the chopping voltage V1 of Fig. 1 LED light adjusting system output.When led driver adopts controllable silicon dimmer to carry out light modulation, must solve a very stubborn problem, be exactly the restriction of impact electric current.Voltage waveform by V1 among Fig. 2 can see that when controllable silicon dimmer switched phase place, V1 voltage climbing speed was very fast, and so big dv/dt will cause very large impulse current on bus.Wherein, dv/dt is the voltage behind the differential.If this impulse current is excessive, will causes controllable silicon dimmer work undesired, thereby influence the dimming behavior of led driver.
In addition, in switching power circuit,, also can damage switching device, therefore, in switching power circuit, also want the impact electric current to limit if load current is excessive to the impulse current of switching device.
The utility model content
The utility model provides a kind of circuit for limiting surge current, with the impulse current of restriction electronic loop, and the protection electronic device.
In order to solve the problems of the technologies described above, the technical scheme of the utility model is: a kind of circuit for limiting surge current comprises
The impedance device and first switching device; Said first switching device comprises control end, the first non-control end and the second non-control end; After said impedance device was connected in parallel on the first non-control end and the second non-control end of said first switching device, its first non-control end was connected with load circuit with the points of common connection of impedance device;
Current detection circuit is used for detecting flow through said impedance device or the said first switching device electric current;
Control circuit is connected with the control end of said first switching device, and receives the current signal that said current detection circuit detects, and is used for the control group device or first switching device and is connected with load circuit.
Further, said control circuit comprises the second switch device that has control end, the first non-control end, the second non-control end, and the differential circuit of controlling said second switch break-over of device or ending.
Further, said differential circuit comprises first electric capacity between the control end of the points of common connection that is connected said impedance device and current detection circuit and said second switch device.
Further, said differential circuit also comprises the 6th resistance of the second non-control end of points of common connection and the said second switch device of the control end that is connected said second switch device and said first electric capacity.
Further, said control circuit also comprises the control end that is connected said second switch device and the 4th resistance between said first electric capacity, and said the 4th resistance is used to limit the input current of the control end of second switch device.
Further, said circuit for limiting surge current also is included as the 3rd resistance that said first switching device and second switch device provide bias voltage, and said the 3rd resistance is connected with accessory power supply.
Further, be parallel with the 3rd electric capacity between the second non-control end of the control end of said first switching device and said first switching device; Be parallel with diode and the 5th resistance between the first non-control end of the control end of said first switching device and said second switch device, the anode tap of said diode is connected with the control end of said first switching device.
Further, said first switching device is double pole triode or fet.
Further, said second switch device is double pole triode or fet.
Compared with prior art; Effective effect of the utility model is: when current detection circuit detects load circuit and produces the load shock electric current greater than the preset value of control circuit; Control circuit controls first switching device and cuts out, and impedance device is connected in the load circuit, thereby has increased the impedance of load circuit; Effectively reduced the size of the impulse current of load circuit generation; Make the stable work of circuit, reduced the rate of change when impulse current falls after rise simultaneously, thereby protected electronic device in the circuit; When current detection circuit detected load circuit and produces the load shock electric current less than the preset value of control circuit, control circuit was controlled the first switching device conducting, and first switching device is connected in the load circuit, has reduced impedance loop and loss.Because the resistance value of first switching device is far smaller than the resistance value of impedance device, so impedance device is by bypass, flow through first switching device and without impedance device of load circuit.
In order to solve the impulse current problem that the LED light adjusting system produces in the prior art, the utility model also provides a kind of LED light adjusting system that described circuit for limiting surge current is made of using, and comprises
The LED illuminating lamp;
Led drive circuit is used to drive said LED illuminating lamp;
Rectification circuit is used for converting the AC power of input to DC power supply, offers said led drive circuit;
Dimmer is connected between AC power and the said rectification circuit, is used for said LED illuminating lamp is carried out light modulation;
Circuit for limiting surge current is connected between rectification circuit and the led drive circuit, is used for the loop impulse current of the said led drive circuit of restricted passage.
Compared with prior art; The beneficial effect of the utility model is: in the LED light adjusting system, increased circuit for limiting surge current; With the impulse current that the loop that reduces the LED light adjusting system produces, prevent that the loop impulse current from producing concussion to the LED dimmer, thereby make the work that dimmer can be stable.
Description of drawings
Fig. 1 is the schematic diagram of the LED light adjusting system of prior art;
Fig. 2 is the oscillogram of chopping voltage V1 of the controllable silicon dimmer output of Fig. 1;
Fig. 3 is the frame principle figure of the utility model circuit for limiting surge current embodiment 1;
Fig. 4 is the circuit theory diagrams of the utility model circuit for limiting surge current embodiment 2;
Fig. 5 is the circuit theory diagrams of the utility model circuit for limiting surge current embodiment 3;
Fig. 6 is the circuit theory diagrams of the utility model circuit for limiting surge current embodiment 4;
Fig. 7 is the circuit theory diagrams of the utility model circuit for limiting surge current embodiment 5;
Fig. 8 is the frame principle figure of the utility model LED light adjusting system one embodiment;
Fig. 9 is the circuit theory diagrams of the utility model LED light adjusting system one embodiment;
Figure 10 is the circuit theory diagrams of dimmer in the utility model LED light adjusting system.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail:
Please refer to Fig. 3; The utility model circuit for limiting surge current; Comprise the impedance device and the first switching device Q1; The said first switching device Q1 comprises control end 3, the first non-control end 1 and the second non-control end 2, and after said impedance device was connected in parallel on the first non-control end 1 and the second non-control end 2 of the said first switching device Q1, its first non-control end 1 was connected with load circuit with the points of common connection of impedance device;
Current detection circuit is used for detecting flow through said impedance device or the said first switching device Q1 electric current;
Control circuit is connected with the control end 3 of the said first switching device Q1, and receives the current signal that said current detection circuit detects, and is used for the control group device or the first switching device Q1 and is connected with load circuit.
Please refer to Fig. 4, present embodiment 1 circuit for limiting surge current comprises
The impedance device and the first switching device Q1, wherein, the first switching device Q1 comprises control end 3, the first non-control end 1 and the second non-control end 2, said impedance device is second resistance R 2; Said second resistance R 2 is connected in parallel between the first non-control end 1 and the second non-control end 2 of the said first switching device Q1, and the first non-control end 1 of the said first switching device Q1 is connected with load circuit with the points of common connection of second resistance R 2; When load circuit does not have the impulse current of moment, connect the first switching device Q1, bypass second resistance R 2.Because the non-control end of two of the first switching device Q1 1, the resistance value between 2 are far smaller than the resistance value of second resistance R 2, therefore second resistance R 2 is by bypass, the flow through first switching device Q1 and without second resistance R 2 of load circuit.When load circuit produces the impulse current of moment, connect second resistance R 2, to increase the impedance of load circuit, the impulse current of load circuit is weakened.
Current detection circuit is used to detect the perhaps load circuit electric current of the said first switching device Q1 of said impedance device of flowing through; Said current detection circuit is first resistance R 1, and said first resistance R 1 is connected the second non-control end 2 of the said first switching device Q1; When load circuit did not have the impulse current of moment, because the first switching device Q1 connects load circuit, therefore, the detection loop of current detection circuit was the first switching device Q1; When load circuit produces the impulse current of moment, because second resistance R 2 is connected load circuit, therefore; The detection loop of current detection circuit is second resistance R 2, and at this moment, the load circuit impedance increases; Impulse current is reduced, reduced the rate of change when impulse current falls after rise simultaneously.
Control circuit is connected with the control end 3 of the said first switching device Q1, and receives the loop current signals of said current detection circuit, is used to control second resistance R 2 or the first switching device Q1 is connected with load circuit.
Wherein, control circuit comprises the second switch device Q2 that has control end 6, first non-control end 4, the second non-control end 5, and the differential circuit of controlling said second switch device Q2 conducting or ending.
Said differential circuit comprises first capacitor C 1 between the control end 6 of the points of common connection that is connected said second resistance R 2 and first resistance R 1 and said second switch device Q2; The loop current signals that said differential circuit collects current detection circuit is carried out after the differential, be used to control the conducting of second switch device Q2 or end, thereby the conducting of controlling the first switching device Q1 is perhaps closed.Because differential circuit can collect the differential value of loop impulse current; And do not receive the influence of running current; Thereby the preset value of having avoided adopting impulse current must and must leave the problem of allowance greater than the maximum of running current, has improved the detection sensitivity of impact electric current, simultaneously; Reduced the preset value of adopting impulse current effectively, eliminated impulse current in the ohmically loss of current detection circuit.
The preset value of control circuit is the conduction threshold of second switch device Q2 in the present embodiment 1.When the detected loop current of current detection circuit during greater than said preset value, second switch device Q2 conducting, then the first switching device Q1 closes.
The circuit for limiting surge current of present embodiment 1 also is included as the 3rd resistance R 3 that said first switching device Q1 and second switch device Q2 provide bias voltage, and said the 3rd resistance R 3 provides said bias voltage through accessory power supply VCC; Wherein, accessory power supply VCC can be independent power supply, also can be connected the output plus terminal of rectification circuit; When the load circuit non-impact current; Accessory power supply VCC charges through the electrode capacitance of 3 couples first switching device Q1 of the 3rd resistance R; When the control end voltage of the first switching device Q1 reached its conduction threshold, the first switching device Q1 opened, and is in conducting state; Thereby make load circuit connect the first switching device Q1, bypass second resistance R 2.
The circuit for limiting surge current of present embodiment 1 also comprises the control end 6 that is connected said second switch device Q2 and the 4th resistance R 4 between said first capacitor C 1, and said the 4th resistance R 4 is used to limit the input current of the control end 6 of second switch device Q2.
Please refer to Fig. 4; Present embodiment 2 is on the basis of embodiment 1, to improve to form; Its difference is: said differential circuit also comprises the 6th resistance R 6 between the second non-control end 5 of points of common connection and said second switch device Q2 of the control end 6 that is connected said second switch device Q2 and said first capacitor C 1.The 6th resistance R 6 is used to adjust time of differential circuit.
Please refer to Fig. 5, present embodiment 3 is on the basis of embodiment 2, to improve to form, and its difference is: be parallel with the 3rd capacitor C 3 between the second non-control end 2 of the control end 3 of the said first switching device Q1 and the said first switching device Q1.Its advantage is: through the value of the 3rd resistance R 3 and the 3rd capacitor C 3 is set, thereby changed the turn on delay time of controlling the first switching device Q1.
Please refer to Fig. 6; Present embodiment 4 is on the basis of embodiment 3, to improve to form; Its difference is: be parallel with diode D and the 5th resistance R 5 between the first non-control end 4 of the control end 3 of the said first switching device Q1 and said second switch device Q2, the anode tap of said diode D is connected with the control end 3 of the said first switching device Q1.Its operation principle is: when load circuit produces the moment impact electric current; Second switch device Q2 conducting, at this moment, the first switching device Q1 forms discharge loop through diode D and second switch device Q2 with ground; The voltage of the control end 3 of the first switching device Q1 is descended fast; Thereby the first switching device Q1 is turn-offed fast,, increase the impedance of load so that second resistance R 2 is connected load circuit; Thereby reduce the influence of impulse current, and protected other electronic device not damaged by impulse current to entire circuit.When load circuit does not have the moment impact electric current; Accessory power supply VCC is through the control end charging of the 3rd resistance R 3,5 couples first switching device Q1 of the 5th resistance R; The 5th resistance R 5 can limit the speed that the voltage of the control end 3 of the first switching device Q1 rises, and changes the parameter of the 5th resistance R 5, can control the speed to control end 3 chargings of the first switching device Q1; So that the stable connection load circuit of the first switching device Q1, the steady operation of assurance entire circuit.
Please refer to Fig. 7, present embodiment 5 is on the basis of embodiment 1, to improve to form, and its difference is: the accessory power supply VCC of the 3rd resistance R 3 is directly provided by the load circuit end.
Above embodiment 1 to 5, the said first switching device Q1, second switch device Q2 can be double pole triode, also can be fet.When the first switching device Q1 or second switch device Q2 were fet, its control end was a grid, and its first non-control end is drain electrode, and its second non-control end is a source electrode; When the first switching device Q1 or second switch device Q2 were double pole triode, its control end was a base stage, and its first non-control end is a collector electrode, and its second non-control end is an emitter.
As preferred implementation, in embodiment 1 to 4, the first switching device Q1 adopts fet, and second switch device Q2 adopts double pole triode.
As preferred implementation, in embodiment 5, the first switching device Q1 adopts double pole triode, and second switch device Q2 adopts fet.
Above embodiment 1 to 5; When current detection circuit detected load circuit and produces the load shock electric current greater than the preset value of control circuit, control circuit controlled first switching device and cuts out, and impedance device is connected in the load circuit; Thereby increased the impedance of load circuit; Effectively reduced the size of the impulse current of load circuit generation, reduced the rate of change when impulse current falls after rise simultaneously, thereby made the stable work of circuit protect electronic device in the circuit; When current detection circuit detected load circuit and produces the load shock electric current less than the preset value of control circuit, control circuit was controlled the first switching device conducting, and switching device is connected in the load circuit, thereby reduces impedance loop and loss.
The basic principle of above embodiment 1 to 5 is: when producing impulse current in the load circuit, the impedance of circuit for limiting surge current increases, to reduce the value of impulse current; After the load circuit impulse current was reduced to certain value, the impedance of circuit for limiting surge current reduced, to increase work efficiency.
Please refer to Fig. 8 to 10, the utility model also provides a kind of LED light adjusting system that above-mentioned circuit for limiting surge current is made of using, and comprises
The LED illuminating lamp;
Led drive circuit is used for the driving LED illuminating lamp;
Rectification circuit is used for converting the AC power of input to DC power supply, offers said led drive circuit;
Dimmer is connected between AC power and the said rectification circuit, is used for said LED illuminating lamp is carried out light modulation.Said dimmer comprises silicon symmetrical switch Q100, and the circuits for triggering that are used to control silicon symmetrical switch Q100 conducting.Wherein, circuits for triggering comprise variable resistor R100, capacitor C 100, bidirectional diode DB300.Its control principle is: through regulating the resistance of variable resistor R10; To change the charging interval of capacitor C 10; Thereby change the controllable silicon Q10 angle of flow through bidirectional diode DB30, with the ON time of control controllable silicon Q10, through the input voltage of the chopping voltage V1 behind the controllable silicon Q10 as led driver; Led driver is controlled the size of output current according to the variation at the copped wave angle of chopping voltage V1, thereby reaches the purpose of LED being carried out light modulation.
Circuit for limiting surge current is connected between rectification circuit and the led drive circuit, is used for the loop impulse current of the said led drive circuit of restricted passage.
The utility model LED light adjusting system; In the LED light adjusting system, increased circuit for limiting surge current; The load shock electric current that produces with the load circuit that reduces the LED light adjusting system; The light modulation loop of having avoided causing because of the loop impulse current produces the problem of concussion, thereby makes the work that dimmer can be stable.
Claims (10)
1. a circuit for limiting surge current comprises
Impedance device and first switching device (Q1); Said first switching device (Q1) comprises control end, the first non-control end and the second non-control end; After said impedance device was connected in parallel on the first non-control end and the second non-control end of said first switching device (Q1), its first non-control end was connected with load circuit with the points of common connection of impedance device;
Current detection circuit is used for detecting flow through said impedance device or said first switching device (Q1) electric current;
Control circuit is connected with the control end of said first switching device (Q1), and receives the current signal that said current detection circuit detects, and is used for control group device or first switching device (Q1) and is connected with load circuit.
2. circuit for limiting surge current as claimed in claim 1; It is characterized in that; Said control circuit comprises the second switch device (Q2) that has control end, the first non-control end, the second non-control end, and the differential circuit of controlling said second switch device (Q2) conducting or ending.
3. circuit for limiting surge current as claimed in claim 2; It is characterized in that; Said differential circuit comprises first electric capacity (C1) between the control end of the points of common connection that is connected said impedance device and current detection circuit and said second switch device (Q2).
4. circuit for limiting surge current as claimed in claim 3; It is characterized in that; Said differential circuit also comprises the 6th resistance (R6) of the second non-control end of points of common connection and the said second switch device (Q2) of the control end that is connected said second switch device (Q2) and said first electric capacity (C1).
5. circuit for limiting surge current as claimed in claim 2; It is characterized in that; Said control circuit; Also comprise the control end that is connected said second switch device (Q2) and the 4th resistance (R4) between said first electric capacity (C1), said the 4th resistance (R4) is used to limit the input current of the control end of second switch device (Q2).
6. circuit for limiting surge current as claimed in claim 2; It is characterized in that; Also being included as said first switching device (Q1) and second switch device (Q2) provides the 3rd resistance (R3) of bias voltage, and said the 3rd resistance (R3) is connected with accessory power supply (VCC).
7. circuit for limiting surge current as claimed in claim 6 is characterized in that, is parallel with the 3rd electric capacity (C3) between the second non-control end of the control end of said first switching device (Q1) and said first switching device (Q1); Be parallel with diode (D) and the 5th resistance (R5) between the first non-control end of the control end of said first switching device (Q1) and said second switch device (Q2), the anode tap of said diode (D) is connected with the control end of said first switching device (Q1).
8. circuit for limiting surge current as claimed in claim 2 is characterized in that, said first switching device (Q1) is double pole triode or fet.
9. circuit for limiting surge current as claimed in claim 2 is characterized in that, said second switch device (Q2) is double pole triode or fet.
10. the LED light adjusting system made of the described circuit for limiting surge current of application such as claim 1-9 is characterized in that, comprises
The LED illuminating lamp;
Led drive circuit is used to drive said LED illuminating lamp;
Rectification circuit is used for converting the AC power of input to DC power supply, offers said led drive circuit;
Dimmer is connected between AC power and the said rectification circuit, is used for said LED illuminating lamp is carried out light modulation;
Circuit for limiting surge current is connected between rectification circuit and the led drive circuit, is used for the loop impulse current of the said led drive circuit of restricted passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299731 CN202633927U (en) | 2012-06-20 | 2012-06-20 | Surge current inhibition circuit and LED (light-emitting diode) dimming system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220299731 CN202633927U (en) | 2012-06-20 | 2012-06-20 | Surge current inhibition circuit and LED (light-emitting diode) dimming system thereof |
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| Publication Number | Publication Date |
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| CN202633927U true CN202633927U (en) | 2012-12-26 |
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| CN 201220299731 Expired - Lifetime CN202633927U (en) | 2012-06-20 | 2012-06-20 | Surge current inhibition circuit and LED (light-emitting diode) dimming system thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904631A (en) * | 2012-12-31 | 2014-07-02 | 海洋王（东莞）照明科技有限公司 | Protection circuit |
| CN104918374A (en) * | 2015-06-08 | 2015-09-16 | 中山市嘉美之光照明电器有限公司 | Dimming device of image signal light-emitting diode (LED) lamp |
| CN105142259A (en) * | 2014-05-30 | 2015-12-09 | 英飞特电子（杭州）股份有限公司 | Device for inhibiting impact current |
| CN105208703A (en) * | 2014-05-30 | 2015-12-30 | 英飞特电子（杭州）股份有限公司 | Device for inhibiting impact current |
| CN106714395A (en) * | 2015-07-27 | 2017-05-24 | 常州明石晶电科技有限公司 | Electric arc protection circuit for LED lighting device and LED lighting device |
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2012
- 2012-06-20 CN CN 201220299731 patent/CN202633927U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904631A (en) * | 2012-12-31 | 2014-07-02 | 海洋王（东莞）照明科技有限公司 | Protection circuit |
| CN105142259A (en) * | 2014-05-30 | 2015-12-09 | 英飞特电子（杭州）股份有限公司 | Device for inhibiting impact current |
| CN105208703A (en) * | 2014-05-30 | 2015-12-30 | 英飞特电子（杭州）股份有限公司 | Device for inhibiting impact current |
| CN105208703B (en) * | 2014-05-30 | 2018-02-27 | 英飞特电子（杭州）股份有限公司 | A kind of device for suppressing dash current |
| CN105142259B (en) * | 2014-05-30 | 2018-02-27 | 英飞特电子（杭州）股份有限公司 | A kind of device for suppressing dash current |
| CN104918374A (en) * | 2015-06-08 | 2015-09-16 | 中山市嘉美之光照明电器有限公司 | Dimming device of image signal light-emitting diode (LED) lamp |
| CN106714395A (en) * | 2015-07-27 | 2017-05-24 | 常州明石晶电科技有限公司 | Electric arc protection circuit for LED lighting device and LED lighting device |
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Effective date of registration: 20170725 Address after: Hangzhou City, Zhejiang province 315002 Binjiang District West Street Chutian Road No. 266 Building No. 5 layer 1-3 Patentee after: Zhejiang Silang Lighting Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: INVENTRONICS (HANGZHOU), Inc. |
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Effective date of registration: 20201123 Address after: 310052 block a, infight building, 459 Jianghong Road, Changhe street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: INVENTRONICS (HANGZHOU), Inc. Address before: 315002 1-3, 5 building, 266 Chutian Road, Binjiang District, Hangzhou, Zhejiang. Patentee before: Zhejiang Silang Lighting Co.,Ltd. |
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