CN103889094A - Drive device used for light-emitting unit and lighting device - Google Patents
Drive device used for light-emitting unit and lighting device Download PDFInfo
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- CN103889094A CN103889094A CN201210559949.6A CN201210559949A CN103889094A CN 103889094 A CN103889094 A CN 103889094A CN 201210559949 A CN201210559949 A CN 201210559949A CN 103889094 A CN103889094 A CN 103889094A
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Abstract
The invention relates to a drive device used for driving a light-emitting unit and a lighting device comprising the drive device. The drive device comprises an input unit which is used for receiving AC power source voltage and outputting a line voltage for supplying power to the light-emitting unit; a switch unit which is used for receiving the line voltage and operating in a switch mode based on a switch control signal so as to supply power to the light-emitting unit; a current detection unit which is used for detecting an input current of the light-emitting unit and outputting a detection current; a current compensation unit which is used for generating a compensation current and determining whether the compensation current is provided according to the line voltage; and a control unit which is used for providing a switch control signal to the switch unit according to the detection current output from the current detection unit and the compensation current output from the current compensation unit. The drive device can reduce input current total harmonic distortion, and the input current total harmonic distortion is reduced to below 20%. Besides, the drive device has the advantages of being simple in structure and low in cost.
Description
Technical field
The disclosure relates generally to the technical field of illumination, particularly, relate to a kind of for driving the drive unit of luminescence unit, relate in particular to one can reduce input current total harmonic distortion (THD) for driving the drive unit of luminescence unit.In addition, the disclosure also relates to a kind of lighting device that comprises this drive unit.
Background technology
In recent years, light-emitting diode (LED) light fixture (containing LED light source and drive unit) is promoted rapidly as a kind of energy saving and environment friendly lighting, is widely used in the fields such as home lighting, automotive lighting, architectural lighting, medical illumination and decorative lighting.Along with the cost continuous decrease of high-brightness LED and improving constantly of performance, can estimate in the near future, the luminous efficiency of LED can match in excellence or beauty such as the traditional lighting light fixture of fluorescent lamp.Than traditional lighting, LED has the advantages such as the life-span is longer and not mercurous.
At present, the subject matter that LED faced is in actual applications how to reduce the input current total harmonic distortion of luminescence unit drive unit.
Summary of the invention
To provide about brief overview of the present disclosure hereinafter, to the basic comprehension about some aspect of the present disclosure is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present disclosure.It is not that intention is determined key of the present disclosure or pith, neither be intended to limit the scope of the present disclosure.Its object is only that the form of simplifying provides some concept, using this as the preorder in greater detail of discussing after a while.
In view of the defect of above-mentioned prior art, object of the present disclosure be to provide a kind of can reduce input current total harmonic distortion for driving the drive unit of luminescence unit.
According to an aspect of the present disclosure, provide a kind of for driving the drive unit of luminescence unit, it comprises: input unit, for receiving AC supply voltage and being output as the line voltage distribution that luminescence unit is powered; Switch element, operates to power to luminescence unit with on-off mode for receiving lines voltage and according to switch controlling signal; Current detecting unit, for detecting and output detections electric current the input current of luminescence unit; Current compensation unit, for generating offset current and determining whether according to line voltage distribution the electric current that affords redress; And control unit, provide switch controlling signal for the offset current receiving according to the detection electric current receiving from current detecting unit with from current compensation unit to switch element.
In addition, according to another aspect of the present disclosure, also provide a kind of lighting device, it comprise according to embodiment of the present disclosure for driving drive unit and the luminescence unit of luminescence unit.
Can reduce input current total harmonic distortion according to drive unit of the present disclosure, input current total harmonic distortion is reduced to below 20%.In addition, this drive unit has advantages of simple in structure, with low cost.
Brief description of the drawings
The disclosure can, by reference to hereinafter given description and being better understood by reference to the accompanying drawings, wherein use same or analogous Reference numeral to represent identical or similar parts in institute's drawings attached.Described accompanying drawing comprises in this manual and forms the part of this specification together with detailed description below, and is used for further illustrating preferred embodiment of the present disclosure and explains principle and advantage of the present disclosure.In the accompanying drawings:
Fig. 1 illustrates according to of the present disclosure for driving the schematic block diagram of drive unit of luminescence unit;
Fig. 2 illustrates the schematic block diagram of the current compensation unit comprising according to drive unit of the present disclosure;
Fig. 3 illustrates of the prior art for driving the typical circuit figure of drive unit of luminescence unit;
Fig. 4 illustrates according to of the present disclosure for driving the schematic circuit of drive unit of luminescence unit;
Fig. 5 illustrates the oscillogram of the each circuit parameter while not using according to current compensation of the present disclosure unit;
Fig. 6 illustrates the oscillogram of the input current while not using according to current compensation of the present disclosure unit;
Fig. 7 illustrates the oscillogram of the each circuit parameter while using according to current compensation of the present disclosure unit; And
Fig. 8 illustrates the oscillogram of the input current while using according to current compensation of the present disclosure unit.
Embodiment
In connection with accompanying drawing, example embodiment of the present disclosure is described hereinafter.All features of actual execution mode are not described for clarity and conciseness, in specification.But, should understand, in the process of any this actual execution mode of exploitation, can make much decisions specific to execution mode, to realize developer's objectives, and these decisions may change to some extent along with the difference of execution mode.
At this, also it should be noted is that, for fear of the details because of unnecessary fuzzy the disclosure, only show in the accompanying drawings with according to the closely-related apparatus structure of scheme of the present disclosure, and omitted other details little with disclosure relation.
Set forth in more detail according to of the present disclosure for driving the drive unit of luminescence unit by accompanying drawing below.It should be understood that the disclosure can't be owing to being only limited to described form of implementation with reference to the description of accompanying drawing as follows.
Fig. 1 illustrates according to of the present disclosure for driving the schematic block diagram of an embodiment of drive unit 1 of luminescence unit.As shown in fig. 1, according to of the present disclosure for driving the drive unit 1 of luminescence unit to comprise input unit 10, switch element 11, control unit 12, current detecting unit 13 and current compensation unit 14.In Fig. 1, also show by the luminescence unit driving according to drive unit 1 of the present disclosure.
In drive unit 1, input unit 10 can receive the line voltage distribution Vbuck that AC supply voltage Vin and output are used to luminescence unit 15 to power.Switch element 11 can receiving lines voltage Vbuck and is operated to power to luminescence unit 15 with on-off mode according to switch controlling signal S1.Current detecting unit 13 can detect and output detections electric current the input current of luminescence unit 15.Current compensation unit 14 can generate offset current and determine whether according to line voltage distribution Vbuck the electric current that affords redress.Control unit 12 can provide switch controlling signal S1 to switch element 11 according to the detection electric current receiving from current detecting unit 13 and the offset current receiving from current compensation unit 14.
As a specific embodiment of current compensation unit 14, as shown in Figure 2, current compensation unit 14 can comprise that offset current acquisition cuicuit 141, offset current provide control circuit 142 and offset current output circuit 143.Offset current acquisition cuicuit 141 can obtain offset current from the input unit 10 as external source, also can obtain offset current from other circuit blocks of drive unit.Offset current provides control circuit 142 to determine whether according to line voltage distribution Vbuck the electric current that affords redress, and offset current is offered control unit 12 by offset current output circuit 143.Offset current provides control circuit 142 can have switch element, describes this switch element in detail below with reference to Fig. 4.The input of this switch element is couple to offset current acquisition cuicuit 141, and the control end of this switch element is couple to line voltage distribution Vbuck and according to line voltage distribution Vbuck conducting or shutoff.In the time that line voltage distribution Vbuck is more than or equal to the threshold voltage of this switch element, the offset current that this switch element conducting and offset current acquisition cuicuit 141 obtain is via this switch element inflow place, and in the time that line voltage distribution Vbuck is less than this threshold voltage, the offset current that this switch element turn-offs and offset current acquisition cuicuit 141 obtains flows to offset current output circuit 143.It will be understood by those skilled in the art that except foregoing circuit is configured to, according to concrete application, current compensation unit 14 can comprise any other the suitable Circnit Layout that can realize identical function.
The offset current that control unit 12 is exported for the detection electric current exported according to current detecting unit 13 and current compensation unit 14 provides switch controlling signal S1 to switch element 11.Control unit 12 can have sense terminals 12-1 and output 12-2, the offset current that the detection electric current that wherein sensing is exported from current detecting unit 13 on sense terminals 12-1 and current compensation unit 14 are exported, and on output 12-2, the control end 11-3 to switch element 11 provides switch controlling signal S1.It will be understood by those skilled in the art that except foregoing circuit is configured to, according to concrete application, control unit 12 can comprise any other the suitable Circnit Layout that can realize identical function.
Show by test, drive unit 1 mentioned above can reduce input current total harmonic distortion, in the situation that using single switch unit 11, input current total harmonic distortion can be reduced to below 20%.By reducing input current total harmonic distortion, not only can reduce line loss, can also reduce harmonic pollution, improve power-efficient.In addition, this drive unit 1 has advantages of simple in structure, with low cost.
In addition, in Fig. 1, also show lighting unit 15.Lighting unit 15 can be for example light-emitting diode.Lighting unit 15 can form lighting device with drive unit 1 combination.
Next, by describe according to embodiment of the present disclosure for driving the specific embodiment of drive unit of luminescence unit.
For ease of relatively, first describe according to the typical circuit figure of the luminescence unit drive unit 3 of prior art with reference to Fig. 3.
As shown in Figure 3, the luminescence unit that the control unit 32 of the luminescence unit drive unit of prior art is produced by commercially available TIX drives chip LM3445U1 to realize, and luminescence unit drives the details of chip LM3445 can be obtained from web address http://www.ti.com/lit/ds/symlink/lm3445.pdf.
In Fig. 3, input unit 30 is made up of full-bridge rectifier 301, line voltage distribution testing circuit 302 and circuit of power factor correction 303.Full-bridge rectifier 301, for the alternating voltage of input is carried out to rectification, overturns the sinusoidal waveform of the negative half period of input voltage for the sinusoidal waveform of positive half cycle.Line voltage distribution testing circuit 302 detects the voltage through rectification, and testing result is offered to control unit 32.Circuit of power factor correction 303 carries out power factor correction to the voltage through rectification.Circuit of power factor correction 303 in Fig. 2 adopts the form of passive power factor correcting circuit.Diode D2 shown in Fig. 2 keeps the voltage of input power factor correction circuit always in high level, prevents voltage inversion.In addition, the capacitor C2 shown in Fig. 2 is for filtering ripple voltage.Input unit 30 is exported the line voltage distribution Vbuck that is used to switch element 31 to power.
As shown in Figure 3, switch element 31 is taked the form of adjusting and voltage-reduction switch unit, and it is by MOSFET Q2, inductor T1-A, T1-B, the formations such as capacitor C9, C11, diode D4.Q2 has formed the switch element in switch element 31.Inductor T1-A, T1-B and capacitor C9, C11 have formed the energy-storage travelling wave tube in switch element 31.When the switch controlling signal of exporting when control unit 32 makes MOSFET Q2 conducting,, to luminescence unit power supply and being charged, energy-storage travelling wave tube in the time that switch controlling signal turn-offs MOSFET Q2, by energy-storage travelling wave tube, luminescence unit is powered by line voltage distribution Vbuck.Diode D4 is as fly-wheel diode, for form current circuit in the time luminescence unit being powered by energy-storage travelling wave tube.
In Fig. 3, resistor R4, R16 and R17 form regulating circuit, for improving circuit adjustment characteristic.
Current detecting unit 33 is made up of resistor R14, R15 and R29, because these resistors are connected to the ISNS pin of LM3445, is therefore jointly called Rsense, and the electric current that flows through Rsense is called as Isense.According to known to the description of switch element 31 above, only, in the time of Q2 conducting, Isense is via Rsense inflow place, and now Isense is the input current of switch element 31.
As shown in Figure 3, drive the switch element 32 of luminescence unit 35 to be connected with electrical network by input unit 31.Because input unit 31 comprises a large amount of non-linear elements, particularly due to the existence of capacity filtering capacitor greatly, make the angle of flow of the rectifier diode in input unit 31 become very narrow, near the only ability conducting peak value of AC-input voltage, cause and exchange input current generation serious distortion, become spike.In this current waveform, comprise a large amount of harmonic components, not only electrical network has been polluted, also caused the active power of exporting after filtering significantly to reduce, power factor is significantly reduced.
Especially, in the time that the drive unit in Fig. 3 starts first, output voltage is Vbuck, and now Q2 keeps conducting, and the electric current therefore being provided by line voltage distribution Vbuck is by Rsense resistor inflow place.For Q2 is turn-offed, need Vsense to be more than or equal to reference voltage Vref, therefore need to flow through the large electric current of Rsense.This electric current is conventionally much higher than the instantaneous value of input current, and therefore in this case, it is high that high input current makes input current total harmonic distortion.Flow through resistor Rsense because lower voltage needs lower input current, therefore, in the time that input voltage is low in half waveform at each sine wave, make the lower voltage at resistor Rsense place can make input current total harmonic distortion reduce.
Next, with reference to Fig. 4 describe according to an embodiment of the present disclosure for driving the drive unit 4 of luminescence unit.Note, each circuit unit shown in Fig. 4 in circuit, be input unit 40(and the full-bridge rectifier 401 comprising, line voltage distribution testing circuit 402 and circuit of power factor correction 403), the function of switch element 41, control unit 42 and current detecting unit 43 respectively with Fig. 3 in corresponding circuit unit, be the function correspondence of input unit 30, switch element 31, control unit 32 and current detecting unit 33, therefore will do not do the description of repetition here.To the difference of the circuit shown in the circuit shown in Fig. 4 and Fig. 3 only be described below.
With reference to Fig. 4, further comprise current compensation unit 44 according to drive unit 4 of the present disclosure.Current compensation unit 44 is mainly made up of MOSFET Q4 and resistor R7, R12, R16, R26 etc.As described above, current compensation unit 44 comprises that offset current acquisition cuicuit, offset current provide control circuit and offset current output circuit.
Resistor R7 and R12 have formed offset current acquisition cuicuit.Resistor R7 is connected with input unit 40 with R12.Current compensation unit 44 can be via resistor R7 and R12 from external source, and input unit 40 obtains offset current.As mentioned before, obtaining offset current from input unit 40 is only an embodiment of the present disclosure.Those skilled in the art it is contemplated that different embodiment, and it can obtain offset current from other circuit units of drive unit 4.
MOSFET Q4 is the main element that the offset current in formation current compensation unit 44 provides control circuit.As shown in Figure 3, the drain electrode of Q4 is connected to resistor R7 and R12, and the grid of Q4 is connected to line voltage distribution Vuck, and the source ground of Q4.
Resistor R16 and R26 have formed offset current output circuit, and wherein resistor R16 is connected between control unit 32 and current detecting unit 43, and resistor R26 is connected between control unit 42 and the drain electrode of Q4.
In operation, when line voltage distribution Vbuck is during lower than the threshold voltage of Q4, Q4 turn-offs, and makes to flow into resistor R16 from the electric current of resistor R7 and R12 via resistor R26, and will produce voltage drop Vcomp on resistor R16.Now, the voltage on the ISNS pin of control unit 42 be Vcomp and Vsense and.When as Vcomp and Vsense's and voltage while being more than or equal to reference voltage Vref, than the situation that is not incorporated to current compensation unit 44, voltage on resistor Rsense is lower and the electric current I sense that flows through it is less, therefore there will not be extra high input current, thereby can reduce input current total harmonic distortion.In the time that the further rising of line voltage distribution Vbuck reaches the threshold voltage of Q4, Q4, therefore will be by Q4 inflow place from the offset current of resistor R7 and R12 by conducting.
In the circuit shown in Fig. 4, the resistance value of resistor R26 is selected as much larger than the resistance value of resistor R16, thereby flow through the electric current of resistor R26 much smaller than the electric current that flows through resistor R16, thereby can not affect the normal work of the regulating circuit being formed by resistor R4, R16 and R17.In one embodiment, the resistance value of resistor R16 is that the resistance value of 10k Ω and resistor R26 is 260k Ω.
According to the operation principle of LM3445, reference voltage Vref can rise along with the rising of line voltage distribution Vbuck, but the electric current that flows through resistor R7 remains unchanged, and therefore the existence of resistor R12 is actually a kind of preferred version.Also, only provide resistor R7 just can complete the function of offset current acquisition cuicuit.After further adding resistor R12, the electric current that flows through resistor R12 can rise slightly along with the rising of line voltage distribution Vbuck, make voltage Vsense increase in mode more slowly, this is favourable for reducing input current total harmonic distortion, and is proved by experiment.
Figure 4 illustrates according to an embodiment of the present disclosure for driving the Circnit Layout of drive unit of luminescence unit, but it will be understood by those skilled in the art that the disclosure is not limited to physical circuit configuration as shown in Figure 4.In the situation that not departing from the scope of the present disclosure and spirit, those skilled in the art can carry out various amendments to each circuit element according to concrete application and actual demand.Especially current compensation unit 44 can form by any other suitable circuit element, as long as these circuit elements can combine the function that realizes the electric current that affords redress.For example, as mentioned above, offset current provides control circuit also can be realized by other devices with switch control functions except mos field effect transistor (MOSFET), such as bipolar transistor, insulated gate bipolar transistor (IGBT) etc.And the design parameter of various circuit elements is selected, and also only just provides for convenience, be not intended to technical scheme of the present disclosure to form and limit.Those skilled in the art can relate to other any suitable parameters as the case may be easily, can realize equally object of the present disclosure.
The technique effect of the reduction input current total harmonic distortion next realizing according to drive unit of the present disclosure with reference to Fig. 5 to 8 description.
Fig. 5 illustrates the oscillogram of the each circuit parameter while not using according to current compensation of the present disclosure unit.In Fig. 5, transverse axis and longitudinal axis (not shown) represent respectively time and corresponding physical quantity (for example, voltage, electric current).As shown in Figure 5, curve 1 represents the voltage at capacitor C2 two ends, i.e. line voltage distribution Vbuck; Curve 2 represents the voltage Vsense at resistor Rsense two ends; Curve 3 represents the front input voltage of bridge; And curve 4 represents the front input current of bridge.As can be seen from Fig. 5, the voltage at the capacitor C2 two ends at first spike place is about 0.3V, and maximum input current is 376mA.
Fig. 6 illustrates the oscillogram of the input current while not using according to current compensation of the present disclosure unit.In Fig. 6, transverse axis represents the time, and the longitudinal axis represents input current.As can be seen from Fig. 6, in beginning and the end of each half-sine wave, there are two current spikes.
Fig. 7 illustrates the oscillogram of the each circuit parameter while using according to current compensation of the present disclosure unit.Similar to Fig. 5, transverse axis and longitudinal axis (not shown) represent respectively time and corresponding physical quantity (for example, voltage, electric current).In Fig. 7, curve 1 represents the voltage at capacitor C2 two ends, i.e. line voltage distribution Vbuck; Curve 2 represents the voltage Vsense at resistor Rsense two ends; Curve 3 represents the front input voltage of bridge; And curve 4 represents the front input current of bridge.As can be seen from Fig. 7, the voltage at the capacitor C2 two ends at several initial spike places is almost nil, and input current rising, and maximum input current is 127mA, significantly reduces than the situation shown in Fig. 5.
Fig. 8 illustrates the oscillogram of the input current while using according to current compensation of the present disclosure unit.In Fig. 8, transverse axis represents the time, and the longitudinal axis represents input current.As can be seen from Fig. 8, by adding current compensation unit 14, obviously eliminated the beginning of the each half-sine wave in Fig. 6 and the current spike that end occurs, thereby reduced input current total harmonic distortion.
In sum, according to the disclosure, can realize the reduction of input current total harmonic distortion by adding some simple circuit elements.Therefore, simple in structure, cheap for manufacturing cost according to drive unit of the present disclosure.In the situation that using single adjusting and voltage-reduction switch unit, its input current total harmonic distortion can be reduced to below 20%.
In addition, the disclosure also provides a kind of lighting device, it comprise according to previous embodiment of the present disclosure for driving the drive unit of luminescence unit and the luminescence unit as light source.This lighting device has the input current total harmonic distortion lower than 20%.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.In addition, the in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In addition, term " couples " or " connection " is intended to comprise respectively directly " coupling " or directly " connections " and indirectly " coupling " or indirect " connection " as used in this article.
Although describe by reference to the accompanying drawings above embodiment of the present disclosure in detail, it should be understood that execution mode described above is just for the disclosure is described, and do not form restriction of the present disclosure.For a person skilled in the art, can make various changes and modifications and not deviate from essence of the present disclosure and scope above-described embodiment.Therefore, the scope of the present disclosure is only limited by appended claim and equivalents thereof.
Claims (10)
1. the drive unit for luminescence unit (15) (1), it comprises:
Input unit (10), it is configured to receive AC supply voltage (Vin) and is output as the line voltage distribution (Vbuck) of described luminescence unit (15) power supply;
Switch element (11), it is configured to receive described line voltage distribution (Vbuck) and operates to power to described luminescence unit (15) with on-off mode according to switch controlling signal (S1);
Current detecting unit (13), it is configured to detect the input current of described luminescence unit (15);
Current compensation unit (14), it is configured to obtain offset current and determines whether to provide described offset current according to described line voltage distribution (Vbuck); And
Control unit (12), it is configured to provide described switch controlling signal (S1) according to the detection electric current from described current detecting unit (13) output with from the described offset current of described current compensation unit (14) output to described Switching Power Supply (11).
2. drive unit according to claim 1 (1), wherein said current compensation unit (14) comprises offset current acquisition cuicuit (141), offset current provides control circuit (142) and offset current output circuit (143), wherein said offset current acquisition cuicuit (141) obtains described offset current from external source, described offset current provides control circuit (142) to determine whether to provide described offset current according to described line voltage distribution (Vbuck), and described offset current output circuit (143) provides at described offset current under the control of control circuit (142) described offset current is offered to described control unit (12).
3. drive unit according to claim 2 (1), wherein said external source is described input unit (10).
4. according to the drive unit described in claim 2 or 3 (1), wherein said offset current provides control circuit (142) to have switch element, described switch element has input, output and control end, the input of described switch element is couple to offset current acquisition cuicuit (141), and the control end of described switch element is couple to described line voltage distribution (Vbuck) and controls described switch element conducting or shutoff according to described line voltage distribution (Vbuck).
5. drive unit according to claim 4 (1), wherein in the time that described line voltage distribution (Vbuck) is more than or equal to the threshold voltage of described switch element, the described offset current that described switch element conducting and described offset current acquisition cuicuit (141) obtain flows into the ground connection side of described drive unit (1) via described switch element, and in the time that described line voltage distribution (Vbuck) is less than described threshold voltage, the described offset current that described switch element turn-offs and described offset current acquisition cuicuit obtains flows to described offset current output circuit (143).
6. according to the drive unit described in claim 4 or 5 (1), wherein said switch element is mos field effect transistor (MOSFET), bipolar transistor or insulated gate bipolar transistor (IGBT).
7. according to the drive unit described in any one in claim 2 to 6 (1), wherein offset current output circuit comprises the first resistor (R16) and the second resistor (R26), described the first resistor (R16) is coupled between described current detecting unit (13) and control unit (12), and described the second resistor (R26) is coupled between described offset current acquisition cuicuit (141) and described control unit (12).
8. according to the drive unit described in any one in claim 2 to 7 (1), wherein offset current acquisition cuicuit comprises the 3rd resistor (R7, R12), described the 3rd resistor (R7, R12) is coupled in described input unit (10) and described offset current provides between control circuit (142), for obtaining offset current from described input unit (10).
9. according to the drive unit described in any one in claim 1 to 8 (1), wherein said luminescence unit (15) is light-emitting diode.
10. a lighting device, comprises luminescence unit, and as claimed in any one of claims 1-9 wherein for the drive unit (1) of described luminescence unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559949.6A CN103889094B (en) | 2012-12-20 | 2012-12-20 | Drive device and lighting device for luminescence unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559949.6A CN103889094B (en) | 2012-12-20 | 2012-12-20 | Drive device and lighting device for luminescence unit |
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| CN103889094A true CN103889094A (en) | 2014-06-25 |
| CN103889094B CN103889094B (en) | 2017-09-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60196825A (en) * | 1984-03-19 | 1985-10-05 | Nissin Electric Co Ltd | Reactive power compensating device |
| CN202009331U (en) * | 2011-05-05 | 2011-10-12 | 上海新进半导体制造有限公司 | Circuit for controlling constant current output in switch power source |
-
2012
- 2012-12-20 CN CN201210559949.6A patent/CN103889094B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60196825A (en) * | 1984-03-19 | 1985-10-05 | Nissin Electric Co Ltd | Reactive power compensating device |
| CN202009331U (en) * | 2011-05-05 | 2011-10-12 | 上海新进半导体制造有限公司 | Circuit for controlling constant current output in switch power source |
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| CN103889094B (en) | 2017-09-05 |
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Effective date of registration: 20230410 Address after: Munich, Germany Patentee after: Optoelectronics Co.,Ltd. Address before: Munich, Germany Patentee before: OSRAM GmbH |