CN102883513B - Electronic ballast protecting circuit and electric ballast - Google Patents
Electronic ballast protecting circuit and electric ballast Download PDFInfo
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- CN102883513B CN102883513B CN201110202764.5A CN201110202764A CN102883513B CN 102883513 B CN102883513 B CN 102883513B CN 201110202764 A CN201110202764 A CN 201110202764A CN 102883513 B CN102883513 B CN 102883513B
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Abstract
This application discloses a kind of electronic ballast protecting circuit and electric ballast。This electronic ballast protecting circuit includes voltage sensing circuit and defencive function circuit, it is characterised in that voltage sensing circuit includes: the first potentiometer level of ground connection, and it receives reference voltage and exports the first voltage division signal；Second potentiometer level of ground connection, it receives the first modulating voltage, exports the second voltage division signal and the 3rd voltage division signal；It is couple to the comparator stage of defencive function circuit, the first voltage division signal, the second voltage division signal and the 3rd voltage division signal are compared, and generation makes the work of defencive function circuit or idle control signal。The application further relates to use the electric ballast of this electronic ballast protecting circuit。
Description
Technical field
The application relates to a kind of electric ballast (ECG) and protects circuit, particularly relates to electronic ballast protecting circuit electric ballast protected when symmetric power load and asymmetric power termination。The application further relates to the electric ballast with this protection circuit。
Background technology
Requirement according to IEC (International Electrotechnical Commission) safety criterion 61347-2-3, when fluorescent lamp (FL) end of life (EOLL), protected for driving the electric ballast of fluorescent lamp to allow for。Additionally, in order to avoid heat leakage, electric ballast is easy to act as during fluorescent lamp heavy overload protected most。
Load characteristic according to fluorescent lamp, the filament at usual two ends works with balanced load form substantially, but the voltage of one end filament occurs abnormal when end of life, and lamp will work with asymmetrically placed load form。At heavy overload but not up to service life, still work with balanced load form, but consume bigger power。Herein; the fluorescent lamp of end of life is called asymmetric power termination; in asymmetric power termination situation, the protection of electric ballast is called that asymmetric power is protected; correspondingly the fluorescent lamp of heavy overload work being called symmetric power load, the protection under symmetric power loading condition is called that symmetric power is protected。
There is the situation using discrete circuit element to realize the protection of asymmetric power and the function of symmetric power protection, but number of elements used is more, also very complicated。At present, most of ECG utilize the integrated circuit (IC) being integrated with EOLL defencive function to meet this requirement。Asymmetric power is protected; topology according to lamp, if " lamp ground connection " (lamptoGND) is topological as shown in Figure 1, wherein lamp Rlamp mono-terminates resonant inductance L; other end ground connection, then be generally integrated circuit (IC) and have a privacy protection pin and be sufficient to；If " capacitor grounding " (CaptoGND) topology shown in Fig. 2, wherein lamp Rlamp passes through block capacitor CHBGround connection, then being generally integrated circuit needs two privacy protection pins。Additionally, protect for symmetric power, usual all schemes are required for using additional pin to realize。
But most of special ICs (ASIC) on open market and especially low cost IC are only suitable to LamptoGND topology, this is because these IC are integrated with voltage window comparator and use a pin for specific protection as input。The application of this design limit, for instance, for charge pump power factor correction topology, most of time lamp is all not directly connected to ground。Additionally, these IC can not be directly used in popular CaptoGND topology。
Additionally, during fluorescent lamp heavy overload, the hot property of ECG is useful by symmetric power protection, but most of low cost ASIC does not provide the pin for this function integrated due to cost pressure。But some ASIC have symmetric power defencive function also use independent protection pin。
Summary of the invention
The technical problem to be solved in the present invention is to provide the electronic ballast protecting circuit of a kind of improvement, and it uses the IC with a defencive function pin to can be achieved with the protection of asymmetric power。
According to an aspect of the present invention, it is provided that a kind of electronic ballast protecting circuit, including voltage sensing circuit and defencive function circuit, it is characterised in that voltage sensing circuit includes: the first potentiometer level of ground connection, it receives reference voltage and exports the first voltage division signal；Second potentiometer level of ground connection, it receives the first modulating voltage, exports the second voltage division signal and the 3rd voltage division signal；It is couple to the comparator stage of described defencive function circuit, the first voltage division signal, the second voltage division signal and the 3rd voltage division signal are compared, and generation makes the work of defencive function circuit or idle control signal。
According to a further aspect in the invention, it is provided that a kind of electric ballast using above-mentioned electronic ballast protecting circuit。
In above-mentioned electronic ballast protecting circuit; can the voltage of simultaneously senses fluoresced light lamp both sides by two potentiometer levels; and output a control signal to the IC with a defencive function pin, the IC with a protection pin can be made to be applicable to multiple lamp topology, especially general CaptoGND topology。Additionally, above-mentioned electronic ballast protecting circuit can also realize symmetric power protection。
Accompanying drawing explanation
In order to be further elucidated with above and other advantage and the feature of the present invention, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail。Should be appreciated that these accompanying drawings only describe the typical case of the present invention, and be not to be taken as the restriction to the scope of the present invention。In the accompanying drawings:
Fig. 1 and Fig. 2 illustrates the schematic diagram of lamptoGND and the CaptoGND topology of fluorescent lamp；
Fig. 3 illustrates the schematic diagram of the example of applied environment of the present invention；
Fig. 4 illustrates the schematic diagram of the typical circuit of electric ballast；
Fig. 5 a-5b illustrates the block diagram of voltage sensing circuit；
Fig. 6 illustrates an embodiment of voltage sensing circuit；
Fig. 7 illustrates the modification of voltage sensing circuit；
Fig. 8 illustrates the another embodiment of voltage sensing circuit。
Detailed description of the invention
It is said that in general, embodiments of the invention relate to electric ballast。More specifically, embodiments of the invention allow the IC in electric ballast to use a protection pin to realize the protection of asymmetric power and symmetric power protection。It should be noted that as explained below is only used as to illustrate and shall not be applied to restriction claims or the scope of the embodiment disclosed herein。
With reference first to Fig. 3, the example of applied environment of the present invention is described。As it is shown on figure 3, electric ballast 300 controls the work of fluorescent lamp 301, and include the integrated circuit 302 (defencive function circuit) protecting electric ballast 300 under fluorescent lamp failure condition。Voltage sensing circuit 303 sensing is couple to the voltage of the node of fluorescent lamp both sides and it is processed, to export control signal to circuit 302。
It should be noted that, " coupling " as used herein is defined as representing do not have being directly connected to of any insertion circuit object between two or more circuit objects, and by being indirectly connected with that one or more insertion circuit objects realize between two or more circuit objects。Such as, two circuit objects being connected to each other directly are referred to as each other " coupling "。If two same circuit objects are connected to one or more insertion circuit object therebetween, it is also referred to as each other " coupling "。
When running; voltage sensing circuit sensing is couple to the voltage of the node of lamp both sides; after inter-process, control signal is exported to the privacy protection pin of integrated circuit 302; integrated circuit 302 uses the window comparator of inside to judge lamp whether normal operation; if normal, electric ballast is not protected by integrated circuit, otherwise electric ballast is protected by the defencive function triggering integrated circuit。Integrated circuit 302 is such as the L6520 of ST (STMicw Electronics) company, it is also possible to apply other similar integrated circuits。These integrated circuits to the defencive function of electric ballast can referring to the introduction of commonly used IC chip, here for simple and clear and omit its detailed description。
Although circuit 302 is illustrated as the integrated circuit that is included within electric ballast in figure 3, but circuit 302 can also be the circuit being made up of discrete component, and also may be located at outside electric ballast。
Voltage sensing circuit 303 in Fig. 3 can adapt to various types of fluorescent lamp by adjusting its inner parameter, broadly says, it is possible to adapts to the various lamps having with similar topology of the present invention。Adjustment and the process of voltage sensing circuit 303 will be described in detail later。
In order to be more fully understood that the present invention, can refer to the schematic diagram of the typical circuit of the electric ballast shown in Fig. 4。As it can be seen, circuit of electronic ballast is by after the filtering of commercial power rectification, produces high frequency voltage then through direct-current-alternating-current converter (also referred to as half bridge inverter circuit) and light fluorescent lamp。As shown in Figure 4, it is made up of current rectifying and wave filtering circuit, start-up circuit, high frequency conversion circuit, resonance circuit and fluorescent lamp。
Power frequency (50Hz or 60Hz) the alternating current AC of 220V is converted the unidirectional current DC into about 300V by current rectifying and wave filtering circuit, provides power supply Vdc for electric ballast；Start-up circuit includes resistor R1, capacitor C2 and bidirectional trigger diode D2, by making transistor VT2 turn on capacitor C2 charging；High frequency conversion circuit generally adopts the self-excited oscillator being made up of a pair audion VT1, VT2 or field effect transistor to realize, and DC source is transformed to the high frequency electric source of about 20K～50KHz, goes to drive fluorescent lamp；Resonance circuit includes inducer L2 (resonant inductance) and capacitor C3, produces a significantly high voltage on capacitor c 3, it is ensured that light fluorescent lamp；The high-frequency electrical energy of about 20K～50KHz is transformed into luminous energy by fluorescent lamp Flamp。
The typical operation of electric ballast is known to those skilled in the art, here for concisely omitting its detailed description。Herein, exporting after claiming rectified filtering to the power supply Vdc of half bridge inverter circuit is half-bridge circuit DC voltage, and claiming the node voltage Vm between transistor VT1 and VT2 of half bridge inverter circuit is half-bridge circuit mid-point voltage。
The voltage sensing circuit 500 of the present invention is described referring to Fig. 5 a。Voltage sensing circuit 500 may be installed on electric ballast, it is also possible to independent of electric ballast。Voltage sensing circuit 500 includes: the first potentiometer level 501, one input end grounding, and another input receives reference voltage Vref, and outfan exports the first voltage division signal；Second potentiometer level 502, one input end grounding, another input receives the first modulating voltage Veolsense, and the first outfan exports the second voltage division signal, the second outfan output the 3rd voltage division signal；Comparator stage 503; by to from the first voltage division signal of the first potentiometer level output, obtain, from the second voltage division signal and the comparison of the 3rd voltage division signal of the second potentiometer level output, the degree that the first modulating voltage rises or falls; and accordingly generate control signal, and this control signal is exported to control defencive function circuit to the special input pin of defencive function circuit electric ballast is protected or does not protect。
In one embodiment, reference voltage Vref is above-mentioned half-bridge circuit DC voltage Vdc or half-bridge circuit mid-point voltage Vm, the first modulating voltage be in resonance circuit lamp at the voltage Veolsense with resonant inductance L2 opposite side。
Fig. 5 b illustrates a kind of configuration example of the circuit 500 of Fig. 5 a。In figure 5b, comparator stage 503 includes first sub-comparator the 504, second sub-comparator 505 and the 3rd sub-comparator 506, first voltage division signal and the second voltage division signal are compared and export the first comparative result to the 3rd comparator by the first sub-comparator, first voltage division signal and the 3rd voltage division signal are compared and export the second comparative result to the 3rd comparator by the second sub-comparator, and the first comparative result and the second comparative result are compared with another reference voltage Vref 1 and export control signal Pro by the 3rd sub-comparator。Then control signal Pro is exported to defencive function circuit, judges whether electric ballast is protected with the value according to control signal。
In circuit of electronic ballast, as it was previously stated, modulating voltage Veolsense is likely to rise or decline under different operating conditions。Above-mentioned first sub-comparator and the second sub-comparator are just respectively used to the degree (the first comparative result and the second comparative result) of the raising and lowering of detection modulating voltage Veolsense; any of exceedes to a certain degree (comparing with described reference voltage Vref 1); then output control signal Pro, activates defencive function circuit。
Fig. 6 schematically shows a kind of specific embodiment 600 of the circuit of Fig. 5 b。Circuit 600 includes the first potentiometer level the 501, second potentiometer level 502 and comparator stage 503, is each configured according to corresponding description thied carry out above in association with Fig. 5。First potentiometer level 501 can include resistor R601 and the R602 being connected in series from Vref to ground, and the first voltage division signal exports between resistor R601 and R602。Similarly, the second potentiometer level 502 can include the resistor R606, R607 and the R608 that are connected in series from Veolsense to ground, and the second voltage division signal exports between resistor R606 and R607, and the 3rd voltage division signal exports between resistor R607 and R608。Moreover it is preferred that the first potentiometer level 501 can also include the capacitor C601 being connected in parallel with resistor R602, it is used for filtering High-frequency Interference。Similarly, the second potentiometer level 502 can also preferably include and be connected in parallel ground capacitor C602 with resistor R607 and R608。
First sub-comparator the 504, second sub-comparator 505 and the 3rd sub-comparator 506 can be made up of transistor (but being not limited to this) respectively, for instance the first transistor Q601, transistor seconds Q602 and third transistor Q603。The base terminal of the first transistor Q601 is couple to the first voltage division signal, and emitter-base bandgap grading end is couple to the second voltage division signal, and collector terminal is couple to the base terminal of third transistor Q603；The base terminal of transistor seconds Q602 is couple to the 3rd voltage division signal, and emitter-base bandgap grading end is couple to the first voltage division signal, and collector terminal is couple to the base terminal of third transistor Q603；The emitter-base bandgap grading end of third transistor Q603 is couple to power Vcc, collector terminal output control signal Pro。
In a variant embodiment, the 3rd sub-comparator 506 can also include: the resistor R605 being coupled between power Vcc and control signal outfan；It is coupled in the resistor R604 between control signal outfan and ground and the resistor R603 being coupled between the collector terminal of third transistor Q603 and control signal outfan, though not in all of embodiment being desirable that so。Resistor R603, R604 and R605 provide suitable working standard point for control signal Pro by Vcc dividing potential drop is come。
Operationally; in the resistor R601 of the first potentiometer level 501, resistor R606, R607, R608 of R602 and the second potentiometer level 502 and comparator stage 503, the value of presumable resistor is chosen to: when the fluorescent lamp normal operation of institute's type of service, transistor Q601, Q602 and Q603 are all not turned on, and now the value of control signal Pro also correspondingly makes defencive function circuit 302 electric ballast do not protected；And transistor selectively turns on when this fluorescent lamp end of life, cause that the voltage of control signal Pro raises trigger protection functional circuit and electric ballast is protected, below this is described in detail。
When fluorescent lamp end of life, modulating voltage Veolsense will increase or reduce, if this voltage increases, then also increasing through the second voltage division signal of the second potentiometer level 502 output and the voltage of the 3rd voltage division signal, transistor Q602 will be caused to turn on because base terminal voltage increases for this and transistor Q601 ends because emitter-base bandgap grading terminal voltage increases。The conducting of transistor Q602 makes the voltage of the base terminal of transistor Q603 reduce, and causes that transistor Q603 turns on, the conducting of transistor Q603 and then cause that from Vcc to control signal Pro the effective resistance outfan reduces, and the value of output control signal Pro increases。Similarly, if modulating voltage Veolsense reduces, then also reducing through the second voltage division signal of the second potentiometer level 502 output and the voltage of the 3rd voltage division signal, transistor Q602 will be caused to end because base terminal voltage reduces for this and transistor Q601 turns on because emitter-base bandgap grading terminal voltage reduces。The conducting of transistor Q601 makes the voltage of the base terminal of transistor Q603 reduce, and causes that transistor Q603 turns on, the conducting of transistor Q603 and then cause that from Vcc to control signal Pro the effective resistance outfan reduces, and the value of output control signal Pro increases。
Those skilled in the art can be placed so that according to the operation principle of defencive function circuit: during fluorescent lamp normal operation, and the value of control signal Pro not trigger protection functional circuit works；And when fluorescent lamp end of life, the value trigger protection functional circuit of the control signal Pro after increase works so that electric ballast to be protected。Such as; if defencive function circuit works based on voltage window comparator; then adjust resistor ratio accordingly based upon Vcc and the voltage of control signal Pro arranged the appropriate value between upper voltage limit and the lower voltage limit of voltage window comparator so that the control signal Pro of increase will exceed this upper voltage limit thus electric ballast is protected by trigger protection functional circuit when fluorescent lamp end of life。
Aforementioned paragraphs explains the mode that inner parameter is adjusted by circuit as the presently preferred embodiments 600 and execution processes。The mode of this embodiment unrestricted adjustment and process。Such as, reference voltage Vref can be couple to the second potentiometer level and modulating voltage Veolsense can be couple to the first potentiometer level。Obviously, each sub-comparator can also be not limited to the transistor in being described above, but can be realized by any device being capable of above-mentioned process。Additionally, describe in the above-described embodiments when control signal Pro value increase time can trigger protection functional circuit, but comparator stage can be additionally configured to so that when control signal Pro value reduce time can trigger protection functional circuit。
In this way it is possible to make the ASIC only with a privacy protection pin be applicable to CaptoGND topology。Voltage can be easily adjusted by adjusting potentiometer level, thus being applicable to the voltage requirements of dissimilar lamp, and improve this circuit tolerance to power source change, because when Vdc changes, two selected voltage Vdc and Veolsense always keep change ratio in the same direction along with this change, thus not affected by power-supply fluctuation。Additionally, present disclosure applies equally to the defencive function circuit being made up of discrete component, now only need additionally to design the protection part that can be triggered by voltage sensing circuit。
With reference to Fig. 7, it is shown that an amendment circuit 700 of the circuit 600 of Fig. 6, its lamp being used especially for having relatively small rated currents, because for the certain lamp of rated power, rated current is less means that rated voltage is bigger。In circuit 700; first sub-comparator 504 and the second sub-comparator 505 can also include stabilivolt D701 and D702 respectively; the resistance of potentiometer level can be adjusted simply for the breakdown voltage of these stabilivolts; make the stabilivolt when modulating voltage Veolsense exceedes certain threshold value during fluorescent lamp end of life breakdown, and and then cause that the value of control signal Pro increases to protect electric ballast。Thus more easily can sense the exception of lamp during EOLL in time, thus protecting electric ballast。
In the another embodiment of voltage sensing circuit 600, also include the 3rd potentiometer level and the second comparator stage, second modulating voltage Vlampsense is carried out dividing potential drop and exports the 4th voltage division signal by the 3rd potentiometer level, and the 4th voltage division signal and control signal Pro are compared and export final control signal Pro by the second comparator stage。The concrete example of this embodiment is described referring to Fig. 8。Wherein, will not be repeated again with the analog structure of the circuit in Fig. 6 and principle。As shown in Figure 8,3rd potentiometer level 507 also accepts the second modulating voltage Vlampsense and inputs and include from the second modulating voltage Vlampsense capacitor C803, resistor R809 and resistor R810 being sequentially connected with to ground, and the second comparator stage 508 includes positive pole and is connected between resistor R809 and R810 and negative pole is connected to the diode D801 of control signal Pro outfan。
So; when electric ballast normal operation; control signal Pro and the second modulating voltage Vlampsense is associated; when symmetric power load; the value of the second modulating voltage Vlampsense seriously overloads along with fluorescent lamp and raises; causing that diode D801 turns on because cathode voltage raises, diode D801 turns on and then causes that the value of control signal Pro also increases therewith, thus electric ballast is protected by trigger protection functional circuit。By using modulating voltage sensing to design symmetric power sensor, designer can adjust Pro voltage according to the voltage window comparator specified by ASIC so that once modulating voltage exceedes predetermined restriction, just triggers the defencive function circuit of ASIC。The advantage of this embodiment is can the limiting circuit tolerance to power source change well。
Description above describes the present invention with reference to specific embodiment。It is to be understood that described embodiment is merely illustrative rather than determinate。Therefore, the scope of the present invention is limited by appended claim rather than description above。Various amendment and change can be carried out when not necessarily departing from the scope of the present invention such as claims restriction。
Claims (13)
1. an electronic ballast protecting circuit, including voltage sensing circuit and defencive function circuit, it is characterised in that described voltage sensing circuit includes:
First potentiometer level of ground connection, it receives reference voltage and exports the first voltage division signal；
Second potentiometer level of ground connection, it receives the first modulating voltage, exports the second voltage division signal and the 3rd voltage division signal；
It is couple to the comparator stage of described defencive function circuit; by the comparison of described first voltage division signal, the second voltage division signal and the 3rd voltage division signal being obtained the degree that the first modulating voltage rises or declines, accordingly generating and making the work of described defencive function circuit or idle control signal。
2. electronic ballast protecting circuit according to claim 1, wherein, described first potentiometer level includes the first resistor and the second resistor that are connected in series from described reference voltage to ground, and described first voltage division signal exports between the two resistor。
3. electronic ballast protecting circuit according to claim 2; wherein; described second potentiometer level includes the 3rd resistor, the 4th resistor and the 5th resistor that are connected in series from the first modulating voltage to ground; described second voltage division signal exports between described 3rd resistor and the 4th resistor, and described 3rd voltage division signal exports between described 4th resistor and the 5th resistor。
4. electronic ballast protecting circuit according to claim 3; wherein; described first potentiometer level also includes the first capacitor being connected in described second resistor two ends in parallel, and described second potentiometer level also includes the second capacitor being connected in described 4th resistor and the 5th resistor two ends in parallel。
5. electronic ballast protecting circuit according to claim 1, wherein, described comparator stage includes the first sub-comparator, second sub-comparator and the 3rd sub-comparator, first voltage division signal and the second voltage division signal are compared and export the first comparative result by described first sub-comparator, first voltage division signal and the 3rd voltage division signal are compared and export the second comparative result by described second sub-comparator, described first comparative result and described second comparative result are compared and export described control signal with another reference voltage by described 3rd sub-comparator, wherein said first comparative result and described second comparative result reflect the degree of described first modulating voltage raising and lowering respectively。
6. electronic ballast protecting circuit according to claim 5, wherein, described first sub-comparator, the second sub-comparator and the 3rd sub-comparator include the first transistor, transistor seconds and third transistor respectively,
The base terminal of described the first transistor is couple to described first voltage division signal, and emitter-base bandgap grading end is couple to the second voltage division signal, and collector terminal is couple to the base terminal of described third transistor；
The base terminal of described transistor seconds is couple to the 3rd voltage division signal, and emitter-base bandgap grading end is couple to described first voltage division signal, and collector terminal is couple to the base terminal of described third transistor；
The emitter-base bandgap grading end of described third transistor is couple to power supply, and collector terminal is couple to control signal outfan。
7. electronic ballast protecting circuit according to claim 6; wherein, described 3rd sub-comparator also includes being coupled between power supply and described control signal outfan the 6th resistor, the 7th resistor being coupled between described control signal outfan and ground and be coupled in the 8th resistor between the collector terminal of described third transistor and described control signal outfan。
8. electronic ballast protecting circuit according to claim 5, wherein, described first sub-comparator also includes the first diode, and its positive pole is connected to the base stage of the first transistor, and negative pole is connected to described first voltage division signal；Described second sub-comparator also includes the second diode, and its positive pole is connected to the base stage of transistor seconds, and negative pole is connected to the 3rd voltage division signal。
9. electronic ballast protecting circuit according to claim 1; also include the 3rd potentiometer level and the second comparator stage; described 3rd potentiometer level receives the second modulating voltage and exports the 4th voltage division signal, and described 4th voltage division signal and control signal are compared and export final control signal by described second comparator stage。
10. electronic ballast protecting circuit according to claim 9; wherein said 3rd potentiometer level includes the 3rd capacitor, the 9th resistor and the tenth resistor that are sequentially connected with from described second modulating voltage to ground; second comparator stage includes diode; the positive pole of described diode is connected between described tenth resistor and the 9th resistor, and negative pole is connected to described control signal outfan。
11. the electronic ballast protecting circuit according to claim 9 or 10; wherein said reference voltage is half-bridge circuit DC voltage or half-bridge circuit mid-point voltage; described second modulating voltage be in half-bridge circuit lamp at the voltage of resonant inductance side, described first modulating voltage be in half-bridge circuit lamp at the voltage with resonant inductance opposite side。
12. according to the electronic ballast protecting circuit one of claim 1-10 Suo Shu, wherein said defencive function circuit is special IC or the circuit being made up of discrete component。
13. an electric ballast, including the electronic ballast protecting circuit according to any one of such as claim 1-12。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110202764.5A CN102883513B (en) | 2011-07-11 | 2011-07-11 | Electronic ballast protecting circuit and electric ballast |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110202764.5A CN102883513B (en) | 2011-07-11 | 2011-07-11 | Electronic ballast protecting circuit and electric ballast |
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| CN102883513A CN102883513A (en) | 2013-01-16 |
| CN102883513B true CN102883513B (en) | 2016-06-22 |
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| CN1972548A (en) * | 2006-09-28 | 2007-05-30 | 崇贸科技股份有限公司 | Current mode syntonic ballast |
| CN101030773A (en) * | 2007-01-31 | 2007-09-05 | 北京中星微电子有限公司 | Safety circuit containing metal oxide semiconductor field effector |
| CN101594064A (en) * | 2009-05-31 | 2009-12-02 | 成都芯源系统有限公司 | Switching power supply controller |
| TW201007420A (en) * | 2008-08-08 | 2010-02-16 | Darfon Electronics Corp | Ballast and circuit protection apparatus thereof |
| CN101854766A (en) * | 2010-04-23 | 2010-10-06 | 清华大学 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972548A (en) * | 2006-09-28 | 2007-05-30 | 崇贸科技股份有限公司 | Current mode syntonic ballast |
| CN101030773A (en) * | 2007-01-31 | 2007-09-05 | 北京中星微电子有限公司 | Safety circuit containing metal oxide semiconductor field effector |
| TW201007420A (en) * | 2008-08-08 | 2010-02-16 | Darfon Electronics Corp | Ballast and circuit protection apparatus thereof |
| CN101594064A (en) * | 2009-05-31 | 2009-12-02 | 成都芯源系统有限公司 | Switching power supply controller |
| CN101854766A (en) * | 2010-04-23 | 2010-10-06 | 清华大学 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
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