CN203086787U - Led control circuit and led illuminating device - Google Patents
Led control circuit and led illuminating device Download PDFInfo
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- CN203086787U CN203086787U CN 201220682689 CN201220682689U CN203086787U CN 203086787 U CN203086787 U CN 203086787U CN 201220682689 CN201220682689 CN 201220682689 CN 201220682689 U CN201220682689 U CN 201220682689U CN 203086787 U CN203086787 U CN 203086787U
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Abstract
The utility model provides an LED control circuit and an LED illuminating device. The LED control circuit comprises a power factor correction module, which can be used to receive an input voltage and a reference voltage, and can be used to output an output voltage, which is acquired by correcting the input voltage according to the reference voltage; a first detection module, which can be used to receive the output voltage, and can be used to output a first detection signal; a light modulation module, which can be used to receive the first detection signal, and can be used to output a light modulation signal according to the first detection signal; a driving module, which can be used to receive the light modulation signal and the output voltage, and can be used to output a driving signal to the LED. The LED control circuit is compatible with the conventional light modulators and the conventional electronic transformers, and can be used to maintain the uniform illuminating of the LED in a very wide light modulation range.
Description
Technical field
The utility model relates to a kind of LED control circuit and uses the LED lighting device of this LED control circuit, more specifically, relates to a kind of LED lighting device that can avoid the LED control circuit of the tunable optical that flicker takes place LED and use this LED control circuit.
Background technology
In recent years, LED replaces incandescent lamp and Halogen lamp LED more and more and is applied to fields such as illumination, yet, because LED is not to be pure resistive load as incandescent lamp and Halogen lamp LED, therefore when directly being applied to the electronic transformer that is generally used for incandescent lamp and Halogen lamp LED, can since ON time of electronic transformer slightly differently during each AC half period cause LED problems such as flicker to occur, particularly work as the light modulation angle than hour, it is obvious that this flicker becomes.
Though proposed the control circuit and the control method of the multiple LED of preventing flicker at present, the IC chip of the compatible silicon controlled light modulation that some producers release has also been made optimal design to this, but present technical scheme does not all solve well avoids LED to produce the problem of flicker in whole dimming scope.
The utility model content
In order to address the above problem, the utility model proposes a kind of LED control circuit and use the LED lighting device of this LED control circuit, can be compatible at present at the electronic transformer of usefulness, and can in the dimming scope (for example, 100% ~ 1%) of non-constant width, keep the LED uniformly light-emitting.
According to an execution mode of the present utility model, a kind of LED control circuit is provided, it can comprise: power factor correction module, receive input voltage and reference voltage, and output is proofreaied and correct the output voltage that input voltage gets according to reference voltage; First detection module receives output voltage, and exports first detection signal; Light-adjusting module receives first detection signal, and according to first detection signal output dim signal; And driver module, receive dim signal and output voltage, and to the LED output drive signal.
In this embodiment, the output voltage of power factor correction module is detected, and changes dim signal according to testing result, thus can stable supplying to the electric current of LED, obtain uniformly light-emitting.
Preferably, light-adjusting module can comprise: comparison module, compare dim signal and predetermined threshold, and according to comparative result output enable signal; Judge module is judged first detection signal whether in preset range when receiving enable signal, and according to the judged result output regulation signal; And the dim signal adjustment module, receive conditioning signal, and output is according to the dim signal of conditioning signal adjusting.
By light-adjusting module so is set, can selects suitable control mode according to the size of dim signal, rather than as usually, in whole dimming scope, use single control mode, thereby can control the luminous of LED better.
Preferably, judge module can comprise: the first detection signal comparison module, and following the output in limited time that is lower than preset range when first detection signal reduces signal, and is higher than the upward output increase in limited time signal of preset range when first detection signal; And the conditioning signal output module, output reduces signal or increases signal as conditioning signal.
By judge module so is set, can suitably sets the preset range of first detection signal according to design requirement, thereby suitably increase or reduce dim signal according to the size of first detection signal.
Preferably, the LED control circuit according to this execution mode can also comprise: the reference voltage generation module generates reference voltage according to first detection signal.
Preferably, the LED control circuit according to this execution mode can also comprise: filtration module is connected to the electronic transformer of LED control circuit outside, and exports filtering voltage; And rectification module, the voltage that accepts filter, and the output commutating voltage is as input voltage.
Preferably, can also comprise according to the LED control circuit of this execution mode: second detection module, detect input voltage, and export second detection signal to light-adjusting module.
Preferably, second detection module can comprise: first and second resistance are connected in series between the input and fixed potential of power factor correction module; First electric capacity is connected between the node and fixed potential between first and second resistance; And the second detection module output, the voltage of exporting the node between first and second resistance is as second detection signal.
Preferably, power factor correction module can comprise: first inductance, and the one termination is received input voltage; First diode, the 3rd electric capacity and the 5th resistance are between the other end and earthing potential that is connected first inductance in sequential series; The pwm signal generator receives reference voltage, and according to the reference voltage output pwm signal; Electronic switch is connected between the node and the node between the 3rd electric capacity and the 5th resistance between first inductance and first diode, and carries out switch according to pwm signal; And output, the voltage of exporting the negative pole end of first diode and the node between the 3rd electric capacity is as output voltage.
Preferably, first detection module can comprise: third and fourth resistance is connected in series between the output and the node between the 3rd electric capacity and the 5th resistance of power factor correction module; Second electric capacity, in parallel with the 4th resistance; And the first detection module output, the voltage of exporting the node between third and fourth resistance is as first detection signal.
Preferably, power factor correction module can comprise booster type change-over circuit, voltage-dropping type change-over circuit or buck-boost type change-over circuit.
Preferably, driver module can comprise: buck controller, output pwm signal; Modulator receives pwm signal and dim signal, and the output modulation signal; And electronic switch, connect with LED, and carry out switch according to modulation signal.
According to another execution mode of the present utility model, a kind of LED lighting device is provided, it can comprise: according to the LED control circuit of above-mentioned execution mode; And LED, luminous by the control of LED control circuit.
LED lighting device according to above-mentioned execution mode can adopt different control modes under the different situation of dim signal, for example, under the big situation of the duty ratio of dim signal, adopt PI or PID control, and under the little situation of the duty ratio of dim signal, adopt the ring control that stagnates, thereby can in whole dimming scope, avoid LED to produce flicker, obtain uniform luminous.
Description of drawings
Fig. 1 is the figure that illustrates according to the LED control circuit of first execution mode of the present utility model;
Fig. 2 is the figure that a concrete structure example of the light-adjusting module among Fig. 1 is shown;
Fig. 3 is the control flow chart that illustrates according to the LED control circuit of first execution mode of the present utility model; And
Fig. 4 is the figure that illustrates according to the LED control circuit of second execution mode of the present utility model.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, in the accompanying drawings, same or analogous reference marker is represented same or analogous parts.
Fig. 1 illustrates the LED control circuit 1 according to first execution mode.As shown in Figure 1, LED control circuit 1 comprises power factor correction module 11, first detection module 12, light-adjusting module 13 and driver module 14.In addition, LED control circuit 1 also comprises reference voltage generation module 15, filtration module 16 and rectification module 17.
The input voltage V that power factor correction module 11 receives from rectification module 17
InAnd from the reference voltage V of reference voltage generation module 15
Ref, according to reference voltage V
RefTo input voltage V
InProofread and correct, to obtain stable output voltage V
Out, the output output voltage V
OutBe used for driving LED.Power factor correction module 11 comprises inductance L 1, diode D1, capacitor C 3, resistance R 5, pwm signal generator 111, electronic switch 112 and output (not shown).
The reference voltage V that pwm signal generator 111 receives from reference voltage generation module 15
Ref, and its current potential with node N4 to be compared, the duty ratio of regulating pwm signal according to comparative result is with the conducting/shutoff of control electronic switch 112.Electronic switch 112 is connected between the node and node N4 between inductance L 1 and the diode D1, with the electric current of shunting when the conducting from inductance L 1.Electronic switch 112 for example can be MOSFET.
The first detection signal V that light-adjusting module 13 receives from first detection module 12
Buffer, and according to the first detection signal V
BufferExport suitable dim signal DIM.Particularly, for example, when the output voltage V of power factor correction module 11
OutDuring increase, the first detection signal V
BufferIncrease, this moment, light-adjusting module 13 increased the ON time of PWM dim signals thereupon, thereby made the output voltage V of power factor correction module 11
OutReduce; Output voltage V when power factor correction module 11
OutDuring reduction, the first detection signal V
BufferReduce, this moment, light-adjusting module 13 shortened the ON time of PWM dim signals thereupon, thereby made the output voltage V of power factor correction module 11
OutRaise.Thus, the output voltage V of power factor correction module 11
OutBasicly stable, LED can not glimmer.Hereinafter will describe a concrete structure example of light-adjusting module 13 in detail with reference to figure 2.
The output voltage V that driver module 14 receives from power factor correction module 11
OutAnd from the dim signal DIM of light-adjusting module 13, and to the LED output drive signal.Particularly, driver module 14 comprises buck controller 141, modulator 142, electronic switch 143, diode D2 and inductance L 2.Between the LED of load, inductance L 2 and electronic switch 143 output and node N4 that is connected power factor correction module 11 in sequential series.The positive terminal of diode D2 is connected to the node between electronic switch 143 and the inductance L 2, and its negative pole end is connected to the output of power factor correction module 11.Modulator 142 receives from the pwm signal of buck controller 141 and from the dim signal DIM of light-adjusting module 13, modulate this pwm signal according to dim signal DIM, and to the pwm signal of electronic switch 143 outputs, with the conducting/shutoff of control electronic switch 143 through ovennodulation.By the conducting/shutoff of electronic switch 143, LED is supplied to suitably drive current, thereby luminous.
Although in the present embodiment, power factor correction module 11 adopts the booster type converting circuit structure, and driver module 14 adopts the voltage-dropping type converting circuit structure, is not limited thereto.For example, can adopt in booster type converting circuit structure, voltage-dropping type converting circuit structure and the liter-voltage-dropping type converting circuit structure any.
Reference voltage generation module 15 is used for according to the first detection signal V
BufferGenerate reference voltage V
RefWhen LED control circuit 1 starts, reference voltage generation module 15 is set at a predetermined value with initial reference voltage, and after startup, reference voltage is set at an appropriate value by for example PI control or PID control, obtain suitable output voltage V with output in power factor correction module
Out
Fig. 2 shows a concrete structure example of the light-adjusting module 13 among Fig. 1.As shown in Figure 2, light-adjusting module 13 comprises comparison module 131, judge module 132 and dim signal adjustment module 133.Comparison module 131 compares the duty ratio of dim signal DIM and the size of predetermined threshold, and according to comparative result output enable signal S
AcJudge module 132 is receiving enable signal S
AcThe time judge the first detection signal V
BufferWhether in preset range, and according to judged result output regulation signal S
AdTo dim signal adjustment module 133.Dim signal adjustment module 133 receives conditioning signal S
AdAnd output is according to conditioning signal S
AdThe dim signal DIM that regulates is to comparison module 131 and driver module 14.
More specifically, as shown in Figure 2, judge module 132 comprises the first detection signal comparison module 1321 and conditioning signal output module 1322.The first detection signal comparison module 1321 is the first detection signal V relatively
BufferWith the upper limit of preset range, the magnitude relationship of lower limit, and at the first detection signal V
BufferThe following output in limited time that is lower than preset range reduces signal, is stating the first detection signal V
BufferBe higher than going up of preset range and export the increase signal in limited time.1322 outputs of conditioning signal output module reduce signal (not shown) or increase signal (not shown) as conditioning signal S
Ad
Fig. 3 shows the control flow chart according to the LED control circuit 1 of first execution mode.As shown in Figure 3, after the control beginning, at step S1, comparison module 131 judges that whether the duty ratio of dim signal DIM is greater than 10%.When comparative result was "No", control flow advanced to control SA; When comparative result was "Yes", control flow advanced to control SB.In the present embodiment, control SA adopts the ring control mode that stagnates, and control SB adopts PI or pid control mode.
In control SA, at step SA0, the first detection signal comparison module 1321 is the first detection signal V relatively
BufferWith the magnitude relationship of predetermined maximum Max_thd, and compare the first detection signal V
BufferMagnitude relationship with predetermined minimum value Min_thd.Predetermined maximum Max_thd, predetermined minimum value Min_thd are predefined according to circuit specification, design requirement.When comparative result shows V
BufferDuring＜Min_thd (step SA11), reduce signal and be generated, with the duty ratio (Dim_Duty--among the step SA12) that reduces dim signal.When comparative result shows V
BufferDuring Max_thd (step SA21), increase signal and be generated, to increase the duty ratio (Dim_Duty++ among the step SA22) of dim signal.Afterwards, at step SA13 and SA23, the light modulation duty ratio of dim signal DIM is updated, and control flow finishes.
In above-mentioned steps SA0, if the first detection signal V
BufferDo not exceed predetermined maximum Max_thd, predetermined minimum value Min_thd, then processing finishes.In addition, in above-mentioned steps SA0, compare the first detection signal V
BufferWith the magnitude relationship of predetermined maximum Max_thd, predetermined minimum value Min_thd, certainly, also can compare the output voltage V of power factor correction module 11
OutWith the magnitude relationship of predetermined maximum, predetermined minimum value, only need according to the first detection signal V this moment
BufferCalculate output voltage V
OutAnd be output voltage V
OutRespective settings predetermined maximum, predetermined minimum value get final product.
In control SB,, adopt PI or PID control ring to calculate the light modulation duty ratio of dim signal DIM at step SB1.Afterwards, at step SB2, the light modulation duty ratio of dim signal DIM is updated, and control flow finishes.
In control flow shown in Figure 3, select different control modes according to the size of the light modulation duty ratio of dim signal DIM.When the light modulation duty ratio adopts the ring control mode that stagnates less than 10% the time, otherwise adopt PI or pid control mode.Thereby, even when the light modulation duty ratio of dim signal DIM hour, LED also can obtain stable electric current supply, thereby has avoided the generation of flicker.
In control flow shown in Figure 3, the predetermined threshold of dim signal is set to 10%, but is not limited thereto, and can set suitable value according to circuit specification and design requirement.
Fig. 4 shows the LED control circuit 2 according to second execution mode.Below only describe LED control circuit 2 and difference in detail, be repeated in this description and omit according to the LED control circuit 1 of first execution mode.
As shown in Figure 4, LED control circuit 2 comprises microcontroller (MCU) 41, to substitute according to light-adjusting module 13 in the LED control circuit 1 of first execution mode and reference voltage generation module 15.For example, microcontroller 41 comprises CPU 411, DA transducer 412, AD converter 413, comparator 414 and DA transducer 415.By the control of microcontroller 41, realize and identical function according to light-adjusting module 13 in the LED control circuit 1 of first execution mode and reference voltage generation module 15.
Particularly, second detection module 42 comprises resistance R 1 between the output that is connected in series in rectification module 17 and the earthing potential and R2, capacitor C 1 and the second detection module output (not shown) in parallel with resistance R 2.The voltage at the node N1 place between the second detection module output output resistance R1 and the R2 is as the second detection signal V
AC_signal
Equally, in LED control circuit 1, also can comprise second detection module 42 according to first execution mode.Second detection module, the 42 exportable second detection signal V
AC_signalTo light-adjusting module 13, thereby light-adjusting module 13 can be according to this second detection signal V
AC_signalFurther regulate dim signal DIM, thereby further improve control precision.
LED control circuit according to above-mentioned execution mode can be used in combination with the existing electronic transformer that is used for incandescent lamp and Halogen lamp LED, and can be provided at the LED lighting device of the interior LED of maintenance of dimming scope (for example, 100% ~ 1%) uniformly light-emitting of non-constant width.
Although this illustrate and described specific embodiment, but what it should be understood by one skilled in the art that is, under the prerequisite that does not deviate from scope of the present utility model, the specific embodiment that various execution modes optional and/or that be equal to can replace institute to describe and illustrate.The application is intended to cover any modification or the distortion of specific embodiment discussed herein.So the utility model is intended to only be limited by claim and equivalent thereof.
Reference numeral
1,2 LED control circuits, 11 power factor correction module
12 first detection modules, 13 light-adjusting modules
14 driver modules, 15 reference voltage generation modules
16 filtration modules, 17 rectification modules
42 second detection modules, 131 comparison modules
132 judge modules, 133 dim signal adjustment modules
1,321 first detection signal comparison modules
1322 conditioning signal output modules
Claims (12)
1. a LED control circuit (1) is characterized in that, comprising:
Power factor correction module (11) receives input voltage (V
In) and reference voltage (V
Ref), and output is according to described reference voltage (V
Ref) proofread and correct described input voltage (V
In) and output voltage (V
Out);
First detection module (12) receives described output voltage (V
Out), and export the first detection signal (V
Buffer);
Light-adjusting module (13) receives the described first detection signal (V
Buffer), and according to the described first detection signal (V
Buffer) output dim signal (DIM); And
Driver module (14) receives described dim signal (DIM) and described output voltage (V
Out), and to the LED output drive signal.
2. LED control circuit according to claim 1 (1) is characterized in that, described light-adjusting module (13) comprising:
Comparison module (131), more described dim signal (DIM) and predetermined threshold, and according to comparative result output enable signal (S
Ac);
Judge module (132) is receiving described enable signal (S
Ac) time judge the described first detection signal (V
Buffer) whether in preset range, and according to judged result output regulation signal (S
Ad); And
Dim signal adjustment module (133) receives described conditioning signal (S
Ad), and output is according to described conditioning signal (S
Ad) the described dim signal (DIM) regulated.
3. LED control circuit according to claim 2 (1) is characterized in that, described judge module (132) comprising:
The first detection signal comparison module (1321) is as the described first detection signal (V
Buffer) the following output in limited time that is lower than described preset range reduces signal, and as the described first detection signal (V
Buffer) be higher than described preset range go up in limited time that output increases signal; And
Conditioning signal output module (1322) is exported described signal or the described increase signal of reducing as described conditioning signal (S
Ad).
4. according to each described LED control circuit (1) in the claim 1 to 3, it is characterized in that, also comprise:
Reference voltage generation module (15) is according to the described first detection signal (V
Buffer) generate described reference voltage (V
Ref).
5. according to each described LED control circuit (1) in the claim 1 to 3, it is characterized in that, also comprise:
Filtration module (16) is connected to the outside electronic transformer of described LED control circuit (1), and the output filtering voltage; And
Rectification module (17) receives described filtering voltage, and the output commutating voltage is as described input voltage (V
In).
6. according to each described LED control circuit (1) in the claim 1 to 3, it is characterized in that, also comprise:
Second detection module (42) detects described input voltage (V
In), and export the second detection signal (V
AC_signal) to described light-adjusting module (13).
7. LED control circuit according to claim 6 (1) is characterized in that, described second detection module (42) comprising:
First and second resistance (R1, R2) are between the input and earthing potential that is connected described power factor correction module (11) in sequential series;
First electric capacity (C1), in parallel with described second resistance (R2); And
The second detection module output, the voltage of exporting the node between described first and second resistance (R1, R2) is as the described second detection signal (V
AC_signal).
8. according to each described LED control circuit (1) in the claim 1 to 3, it is characterized in that described power factor correction module (11) comprising:
First inductance (L1), one termination are received described input voltage (V
In);
First diode (D1), the 3rd electric capacity (C3) and the 5th resistance (R5) are between the other end and earthing potential that is connected described first inductance (L1) in sequential series;
Pwm signal generator (111) receives described reference voltage (V
Ref), and according to described reference voltage (V
Ref) output pwm signal;
Electronic switch (112) is connected between the node and the node between described the 3rd electric capacity (C3) and described the 5th resistance (R5) between described first inductance (L1) and described first diode (D1), and carries out switch according to described pwm signal; And
Output, the voltage of exporting the negative pole end of described first diode (D1) and the node between described the 3rd electric capacity (C3) is as described output voltage (V
Out).
9. LED control circuit according to claim 8 (1) is characterized in that, described first detection module (12) comprising:
Third and fourth resistance (R3, R4) is connected in series between the output and the node between described the 3rd electric capacity (C3) and described the 5th resistance (R5) of described power factor correction module (11);
Second electric capacity (C2), in parallel with described the 4th resistance (R4); And
The first detection module output, the voltage of exporting the node between described third and fourth resistance (R3, R4) is as the described first detection signal (V
Buffer).
10. according to each described LED control circuit (1) in the claim 1 to 3, it is characterized in that described power factor correction module (11) comprises booster type change-over circuit, voltage-dropping type change-over circuit or buck-boost type change-over circuit.
11., it is characterized in that described driver module (14) comprising according to each described LED control circuit (1) in the claim 1 to 3:
Buck controller (141), output pwm signal;
Modulator (142) receives described pwm signal and described dim signal (DIM), and the output modulation signal; And
Electronic switch (143) is connected with described LED, and is carried out switch according to described modulation signal.
12. a LED lighting device is characterized in that, comprising:
According to each described LED control circuit (1) in the claim 1 to 11; And
LED, luminous by described LED control circuit (1) control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220682689 CN203086787U (en) | 2012-12-11 | 2012-12-11 | Led control circuit and led illuminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220682689 CN203086787U (en) | 2012-12-11 | 2012-12-11 | Led control circuit and led illuminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086787U true CN203086787U (en) | 2013-07-24 |
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ID=48832582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220682689 Expired - Lifetime CN203086787U (en) | 2012-12-11 | 2012-12-11 | Led control circuit and led illuminating device |
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| Country | Link |
|---|---|
| CN (1) | CN203086787U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039044A (en) * | 2014-06-05 | 2014-09-10 | 常州顶芯半导体技术有限公司 | Approximation type self-adaptive LED (Light Emitting Diode) linear control circuit and control method thereof |
| CN104797048A (en) * | 2015-04-15 | 2015-07-22 | 深圳市通普科技有限公司 | Dimmable LED driving power source and dimmable LED lighting lamp compatible to halogen lamps |
| CN104427716B (en) * | 2013-09-06 | 2016-11-30 | 聚积科技股份有限公司 | Light emitting diode driving circuit |
| CN104717795B (en) * | 2013-12-16 | 2017-03-01 | 立锜科技股份有限公司 | There is light-emitting component control circuit and its control method of dimming function |
| CN108322959A (en) * | 2017-11-03 | 2018-07-24 | 赛尔富电子有限公司 | A kind of light adjusting system of LED lamp |
| CN110729772A (en) * | 2019-11-20 | 2020-01-24 | 青岛科汇电气有限公司 | Intelligent power supply and power supply control method for electronic current transformer |
-
2012
- 2012-12-11 CN CN 201220682689 patent/CN203086787U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427716B (en) * | 2013-09-06 | 2016-11-30 | 聚积科技股份有限公司 | Light emitting diode driving circuit |
| CN104717795B (en) * | 2013-12-16 | 2017-03-01 | 立锜科技股份有限公司 | There is light-emitting component control circuit and its control method of dimming function |
| CN104039044A (en) * | 2014-06-05 | 2014-09-10 | 常州顶芯半导体技术有限公司 | Approximation type self-adaptive LED (Light Emitting Diode) linear control circuit and control method thereof |
| CN104039044B (en) * | 2014-06-05 | 2016-08-03 | 常州顶芯半导体技术有限公司 | A kind of approximant adaptive LED linearity control circuit and control method thereof |
| CN104797048A (en) * | 2015-04-15 | 2015-07-22 | 深圳市通普科技有限公司 | Dimmable LED driving power source and dimmable LED lighting lamp compatible to halogen lamps |
| CN104797048B (en) * | 2015-04-15 | 2017-09-01 | 深圳市通普科技有限公司 | A kind of compatible Halogen lamp LED Dimmable LED driving power supply and illuminator |
| CN108322959A (en) * | 2017-11-03 | 2018-07-24 | 赛尔富电子有限公司 | A kind of light adjusting system of LED lamp |
| CN108322959B (en) * | 2017-11-03 | 2024-03-15 | 赛尔富电子有限公司 | Dimming system of LED lamp |
| CN110729772A (en) * | 2019-11-20 | 2020-01-24 | 青岛科汇电气有限公司 | Intelligent power supply and power supply control method for electronic current transformer |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181221 Address after: Munich, Germany Patentee after: LEDVANCE GmbH Address before: Munich, Germany Patentee before: Osram GMBH |
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| CX01 | Expiry of patent term |
Granted publication date: 20130724 |
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