CN103957652B - A kind of voltage monitoring circuit of DC ballast - Google Patents
A kind of voltage monitoring circuit of DC ballast Download PDFInfo
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- CN103957652B CN103957652B CN201410125838.3A CN201410125838A CN103957652B CN 103957652 B CN103957652 B CN 103957652B CN 201410125838 A CN201410125838 A CN 201410125838A CN 103957652 B CN103957652 B CN 103957652B
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Abstract
The invention discloses the voltage monitoring circuit of a kind of DC ballast, described voltage monitoring circuit includes: voltage detecting circuit, and for detecting the height of described detection supply voltage and correspondingly exporting the first control signal, its detection input connects detection power supply；ON-OFF control circuit, its input connects the outfan of described voltage detecting circuit and produces to drive signal according to described first control signal received, and its drive output exports described driving signal；First switching tube, it controls end and connects the drive output of described ON-OFF control circuit and control conducting and the shutoff of described first switching tube according to described driving signal, and described first switching tube conducting then its outfan is using the main circuit power voltage correspondingly output services voltage received with input the outfan as described voltage monitoring circuit.Prevent from damaging ballast when voltage input is abnormal.
Description
Technical field
The present invention relates to field, DC ballast, the voltage monitoring circuit of especially a kind of DC ballast.
Background technology
Existing DC ballast is generally by storage battery power supply, during due to accumulator cell charging and discharging voltage from battery to ballast, there is line loss or accumulator work long hours after aging there are the abnormal conditions such as the undertension that provides, capital causes the motherboard circuit input supply voltage instability of ballast, and ballast does not generally possess its voltage monitoring circuit, therefore the exception of ballast input voltage cannot be monitored, so that damaging ballast.
Owing to there are above abnormal conditions, it is badly in need of a kind of circuit can monitored ballast input voltage and protection can be provided to DC ballast when input voltage is too high or too low at present.
Summary of the invention
It is an object of the invention to provide the voltage monitoring circuit of a kind of DC ballast, it is possible to the voltage of detection input ballast, and overtension or too low time cut off the power supply input of main circuit, thus preventing from damaging ballast when voltage input is abnormal.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that the voltage monitoring circuit of a kind of DC ballast, the motherboard circuit of described DC ballast is powered by main circuit power, input in DC ballast sets power detecting point as detection power supply, and described voltage monitoring circuit includes:
Voltage detecting circuit 1, for detecting the height of described detection supply voltage and correspondingly exporting the first control signal, its detection input connects detection power supply；
ON-OFF control circuit 2, its input connects the outfan of described voltage detecting circuit 1 and produces to drive signal according to described first control signal received, and its drive output exports described driving signal；
First switching tube Q8, it controls end and connects the drive output of described ON-OFF control circuit 2 and control conducting and the shutoff of described first switching tube Q8 according to described driving signal, and described first switching tube Q8 conducting then its outfan is using the main circuit power voltage correspondingly output services voltage received with input the outfan as described voltage monitoring circuit.
Preferably, described ON-OFF control circuit 2 is made up of controlled division circuit 21 and drive circuit 22, described controlled division circuit 21 input connects the outfan of described voltage detecting circuit 1, and obtaining the first branch pressure voltage according to described first control signal received, described drive circuit 22 is according to described first branch pressure voltage output drive signal.
Preferably, described drive circuit 22 includes:
First IGCT IC2, its gate pole receives described first branch pressure voltage；
Second switch pipe Q6, it controls the negative electrode that end connects described first IGCT IC2, and described second switch pipe Q6 turns off when described first IGCT IC2 is controlled by described first dividing potential drop and turns on；
3rd switching tube Q7, it controls the outfan that end connects described second switch pipe Q6, and described 3rd switching tube Q7 turns on when described second switch pipe Q6 turns off, and its outfan exports described driving signal as the outfan of described ON-OFF control circuit 2.
Preferably, connecting clamp circuit between earth terminal and the ground of described second switch pipe Q6, including resistance and at least one diode, the anode of wherein said diode connects the earth terminal of described second switch pipe Q6.
Preferably, described controlled division circuit 21 includes: the bleeder circuit being in series by the first resistance R8 and the second resistance R9, and the 4th switching tube Q3；Wherein, the outfan of the 4th switching tube Q3 is connected to the junction point of the first described resistance R8 and the second resistance R9 and provides described first branch pressure voltage, the end that controls of the 4th described switching tube Q3 is coupled in the outfan of described voltage detecting circuit 1 and receives described first control signal, and it is high level that described first control signal controls the first branch pressure voltage described in when described 4th switching tube Q3 turns off.
Preferably, being also connected with Voltage Cortrol electronic circuit between earth terminal and the ground of described second resistance, described Voltage Cortrol electronic circuit includes:
5th switching tube Q4, it controls end and coupled to the outfan of described voltage monitoring circuit, and its outfan coupled to described detection power supply；
6th switching tube Q5, its control end connect described 5th switching tube Q4 outfan, described 6th switching tube Q5 its outfan connect a resistance and and another resistor coupled in parallel between earth terminal and the ground of described second resistance R9；
Wherein, described 5th switching tube Q4 conducting when described first switching tube Q8 conducting, described 6th switching tube Q5 turns off when described 5th switching tube Q4 conducting simultaneously, and the first branch pressure voltage of described bleeder circuit is determined according to the conducting situation of described 5th switching tube Q4.
Preferably, described voltage detecting circuit 1 includes:
Sensing bleeder circuit, is connected between described detection power supply and ground, its outfan output induced voltage；
Second IGCT IC1, its gate pole controls conducting and shutoff, its plus earth of described second IGCT IC1 according to the described induced voltage received；
3rd resistance R3, its first end connects the negative electrode of described second IGCT IC1, and its second end connects described detection power supply；
7th switching tube Q2, it controls end and coupled to first end of described 3rd resistance R3 and control conducting and the shutoff of described 7th switching tube Q2 according to the on or off of described second IGCT IC1, its outfan coupled to described detection power supply and the outfan as described voltage detecting circuit 1 exports described first control signal, its 3rd end coupling grounding.
Preferably, the second outfan output abnormality prompting voltage of described ON-OFF control circuit 2 is to described voltage detecting circuit 1, and described voltage detecting circuit 1 also includes:
8th switching tube Q1, it controls end and coupled to the second outfan the conducting of the 8th switching tube Q1 and the shutoff according to the described abnormal prompt Control of Voltage received of described ON-OFF control circuit 2, its outfan is coupled in described detection power supply, second end of the 7th switching tube Q2 described in its three-terminal link.
Preferably, go-and-retum at described 3rd resistance R3 is also connected with the first light emitting diode LR too high for showing detection supply voltage, between the outfan and described detection power supply of described 8th switching tube Q1, it is also connected with the second light emitting diode LY too low for showing detection supply voltage, is also connected with between the control end and described detection power supply of described second switch pipe Q6 for showing the detection normal 3rd light emitting diode LG of supply voltage；Wherein the anode of each light emitting diode connects described detection power supply.
After adopting technique scheme, the present invention compared with prior art has following outstanding advantages:
Using the voltage of certain test point of ballast input in motherboard circuit as detection supply voltage, voltage detecting circuit can monitor this detection supply voltage, and when this voltage is normal, ON-OFF control circuit drives the first switching tube conducting, makes motherboard circuit normal operation；When this overtension or too low time, voltage detecting circuit by first control signal control ON-OFF control circuit, make ON-OFF control circuit turn off the first switching tube, block motherboard circuit power supply input, thus protecting ballast.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the voltage monitoring circuit according to DC ballast of the present invention；
Fig. 2 is an embodiment of the voltage monitoring circuit according to DC ballast of the present invention.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Elaborate a lot of detail in the following description so that fully understanding the present invention.But the present invention can implement being much different from alternate manner described here, and those skilled in the art can do similar popularization when without prejudice to intension of the present invention, therefore the present invention is by the following public restriction being embodied as.
Fig. 1 illustrates the theory diagram of the voltage monitoring circuit of the DC ballast according to the present invention, a kind of voltage monitoring circuit of DC ballast, the motherboard circuit of described DC ballast is powered by main circuit power VIN, input in DC ballast sets power detecting point as detection power supply VC, described voltage monitoring circuit includes: voltage detecting circuit 1, for detecting the height of described detection supply voltage and correspondingly exporting the first control signal, its detection input connects detection power supply VC；ON-OFF control circuit 2, its input connects the outfan of described voltage detecting circuit 1 and produces to drive signal according to described first control signal received, and its drive output exports described driving signal；First switching tube Q8, it controls end and connects the drive output of described ON-OFF control circuit 2 and control conducting and the shutoff of described first switching tube Q8 according to described driving signal, and described first switching tube Q8 conducting then its outfan is using the main circuit power voltage correspondingly output services voltage VOUT received with input the outfan as described voltage monitoring circuit.Exemplary, the first switching tube Q8 is PNP triode, is not intended as at this limiting, and the first switching tube Q8 can be all the other bipolar transistors or field-effect transistor.
Further, described ON-OFF control circuit 2 is made up of controlled division circuit 21 and drive circuit 22, described controlled division circuit 21 input connects the outfan of described voltage detecting circuit 1, and obtaining the first branch pressure voltage according to described first control signal received, described drive circuit 22 is according to described first branch pressure voltage output drive signal.
When detecting supply voltage and being normal, voltage detecting circuit 1 controls ON-OFF control circuit 2 output drive signal by the first control signal, drives the first switching tube Q8 conducting, makes motherboard circuit normal operation；When detecting supply voltage and being too high or too low; first control signal of voltage detecting circuit makes ON-OFF control circuit output turn off the driving signal of the first switching tube Q8; first switching tube Q8 has blocked main circuit power VIN input; motherboard circuit does not work; ballast no-voltage inputs, thus protecting ballast.
Fig. 2 is an embodiment of the voltage monitoring circuit according to DC ballast of the present invention.
Concrete, in Fig. 2, voltage detecting circuit 1 includes: sensing bleeder circuit, is connected between described detection power supply and ground, its outfan output induced voltage, and in the present embodiment, sensing bleeder circuit is made up of resistance R1 and R2 dividing potential drop, and outfan is the junction point of R1 and R2；Second IGCT IC1, its gate pole controls conducting and shutoff, its plus earth of described second IGCT IC1 according to the described induced voltage received；3rd resistance R3, its first end connects the negative electrode of described second IGCT IC1, and its second end connects described detection power supply；7th switching tube Q2, it controls end and coupled to first end of described 3rd resistance R3 and control conducting and the shutoff of described 7th switching tube Q2 according to the on or off of described second IGCT IC1, its outfan coupled to described detection power supply and the outfan as described voltage detecting circuit 1 exports described first control signal, its 3rd end coupling grounding.
Controlled division circuit 21 includes: the bleeder circuit being in series by the first resistance R8 and the second resistance R9, and the 4th switching tube Q3；Wherein, the outfan of the 4th switching tube Q3 is connected to the junction point of the first described resistance R8 and the second resistance R9 and provides described first branch pressure voltage, the end that controls of the 4th described switching tube Q3 is coupled in the outfan of described voltage detecting circuit 1 and receives described first control signal, and it is high level that described first control signal controls the first branch pressure voltage described in when described 4th switching tube Q3 turns off.
Optionally, in controlled division circuit, being also connected with Voltage Cortrol electronic circuit between earth terminal and the ground of described second resistance, described Voltage Cortrol electronic circuit includes: the 5th switching tube Q4, it controls end and coupled to the outfan of described voltage monitoring circuit, and its outfan coupled to described detection power supply；6th switching tube Q5, its control end connect described 5th switching tube Q4 outfan, described 6th switching tube Q5 its outfan connect a resistance and and another resistor coupled in parallel between earth terminal and the ground of described second resistance R9；Wherein, described 5th switching tube Q4 conducting when described first switching tube Q8 conducting, described 6th switching tube Q5 turns off when described 5th switching tube Q4 conducting simultaneously, and the first branch pressure voltage of described bleeder circuit is determined according to the conducting situation of described 5th switching tube Q4.
Drive circuit 22 includes: the first IGCT IC2, and its gate pole receives described first branch pressure voltage；Second switch pipe Q6, it controls the negative electrode that end connects described first IGCT IC2, and described second switch pipe Q6 turns off when described first IGCT IC2 is controlled by described first dividing potential drop and turns on；3rd switching tube Q7, it controls the outfan that end connects described second switch pipe Q6, and described 3rd switching tube Q7 turns on when described second switch pipe Q6 turns off, and its outfan exports described driving signal as the outfan of described ON-OFF control circuit 2.
Optionally, in drive circuit 22, clamp circuit is connected between earth terminal and the ground of described second switch pipe Q6, including resistance and at least one diode, the anode of wherein said diode connects the earth terminal of described second switch pipe Q6, and the present embodiment is preferably two diodes, is diode D4 and D5 respectively, prevent earthy raising, ensure that second switch pipe current potential of its control end when conducting is higher simultaneously.Second outfan (negative electrode of the first IGCT IC2 in Fig. 2) output abnormality prompting voltage (i.e. the current potential controlling end of second switch pipe) the extremely described voltage detecting circuit 1 of described ON-OFF control circuit 2, described voltage detecting circuit 1 also includes: the 8th switching tube Q1, it controls end and coupled to the second outfan the conducting of the 8th switching tube Q1 and the shutoff according to the described abnormal prompt Control of Voltage received of described ON-OFF control circuit 2, its outfan is coupled in described detection power supply, second end of the 7th switching tube Q2 described in its three-terminal link.
Exemplary, second to the 8th switching tube is NPN audion, being not intended as at this limiting, the second to the 8th switching tube can be all the other bipolar transistors or field-effect transistor, and it is preferred that the selecting to consider merely for one-tenth present aspect of the first to the 8th switching tube is made by the present embodiment.
Optionally, go-and-retum at described 3rd resistance R3 is also connected with the first light emitting diode LR too high for showing detection supply voltage, between the outfan and described detection power supply of described 8th switching tube Q1, it is also connected with the second light emitting diode LY too low for showing detection supply voltage, is also connected with between the control end and described detection power supply of described second switch pipe Q6 for showing the detection normal 3rd light emitting diode LG of supply voltage；Wherein the anode of each light emitting diode connects described detection power supply.
With continued reference to Fig. 2, below the operation principle of the voltage monitoring circuit of embodiment of the present invention DC ballast is specifically described.
When the voltage of detection power supply VC is in zone of reasonableness (those skilled in the art can according to circumstances determine), the induced voltage of sensing bleeder circuit output is not enough so that the second IGCT IC1 turns on, namely the second IGCT IC1 turns off, now the first light emitting diode LR lamp goes out, second IGCT IC1 negative electrode is high potential, 7th switching tube Q2 conducting, thus the first control signal of the 7th switching tube Q2 output is electronegative potential, the 4th switching tube Q3 making controlled division circuit 21 turns off, first branch pressure voltage of the bleeder circuit output being in series by the first resistance R8 and the second resistance R9 is high potential, and this high potential is enough to make the first IGCT IC2 conducting, now the 3rd light emitting diode LG lamp is bright, first IGCT IC2 negative electrode output electronegative potential makes second switch pipe Q6 turn off, second switch pipe Q6 exports high potential, thus the 3rd switching tube Q7 conducting, output drive signal makes the first switching tube Q8 conducting, the main circuit power voltage received with input is correspondingly exported normal running voltage VOUT by the first switching tube Q8 outfan.
When detecting overtension, the induced voltage of sensing bleeder circuit output makes the second IGCT IC1 conducting, i.e. the second IGCT IC1 conducting, now the first light emitting diode LR lamp is bright, second IGCT IC1 negative electrode is electronegative potential, 7th switching tube Q2 turns off, thus the first control signal of the 7th switching tube Q2 output is high potential, make the 4th switching tube Q3 conducting of controlled division circuit 21, first branch pressure voltage of the bleeder circuit output being in series by the first resistance R8 and the second resistance R9 is electronegative potential (namely on the second resistance R9, no current flows through), the first IGCT IC2 is made to turn off, now the 3rd light emitting diode LG lamp goes out, first IGCT IC2 negative electrode output high potential makes second switch pipe Q6 turn on, second switch pipe Q6 exports electronegative potential, thus the 3rd switching tube Q7 turns off, the driving signal of output makes the first switching tube Q8 turn off, first switching tube Q8 outfan Non voltage output.
When detecting brownout, second IGCT IC1, first IGCT IC2 is turned off, now the first light emitting diode LR lamp goes out, second IGCT IC1 negative electrode is electronegative potential, 7th switching tube Q2 conducting, 3rd light emitting diode LG lamp goes out simultaneously, first IGCT IC2 negative electrode output high potential makes second switch pipe Q6 turn on, second switch pipe Q6 exports electronegative potential, thus the 3rd switching tube Q7 turns off, the driving signal of output makes the first switching tube Q8 turn off, first switching tube Q8 outfan Non voltage output, 8th switching tube Q1 of the second outfan output abnormality prompting voltage (i.e. the high potential controlling end of second switch pipe Q6) extremely described voltage detecting circuit 1 of described ON-OFF control circuit 2, 8th switching tube Q1 conducting, now the second light emitting diode LY lamp is bright.When the voltage detecting power supply is normal and too high, the 8th switching tube Q1 is turned off, thus the second equal lamp of light emitting diode LY goes out.
In controlled division circuit, it is also connected with Voltage Cortrol electronic circuit between earth terminal and the ground of described second resistance, when the first switching tube Q8 outfan exports normal running voltage VOUT, in described Voltage Cortrol electronic circuit, 5th switching tube Q4 conducting, 6th switching tube Q5 turns off because controlling end and being electronegative potential, is further ensured that the first branch pressure voltage of bleeder circuit is in high potential.
It should be noted that, also include the elements such as all the other multiple resistance, electric capacity and Zener diode in fig. 2, adopting the circuit connecting mode shown in Fig. 2 is to enable the present embodiment to embody better performance, it is to filter corresponding interference that such as electric capacity is used as decoupling, bypass etc., Zener diode is for making voltage stabilization, and the suitably change that the concrete form of the present embodiment is made by those skilled in the art according to physical condition is within the scope of the present invention.
Although the present invention is with preferred embodiment openly as above; but it is not for limiting claim; any those skilled in the art are without departing from the spirit and scope of the present invention; can making possible variation and amendment, therefore protection scope of the present invention should be as the criterion with the scope that the claims in the present invention define.
Claims (7)
1. a voltage monitoring circuit for DC ballast, the motherboard circuit of described DC ballast is powered by main circuit power, and the input in DC ballast sets power detecting point as detection power supply, and described voltage monitoring circuit includes:
Voltage detecting circuit (1), for detecting the height of described detection supply voltage and correspondingly exporting the first control signal, its detection input connects detection power supply；
ON-OFF control circuit (2), its input connects the outfan of described voltage detecting circuit (1) and produces to drive signal according to described first control signal received, and its drive output exports described driving signal；
First switching tube (Q8), it controls end and connects the drive output of described ON-OFF control circuit (2) and control conducting and the shutoff of described first switching tube (Q8) according to described driving signal, and described first switching tube (Q8) conducting then its outfan is using the main circuit power voltage correspondingly output services voltage received with input the outfan as described voltage monitoring circuit；Described ON-OFF control circuit (2) is made up of controlled division circuit (21) and drive circuit (22), described controlled division circuit (21) input connects the outfan of described voltage detecting circuit (1), and obtaining the first branch pressure voltage according to described first control signal received, described drive circuit (22) is according to described first branch pressure voltage output drive signal；
It is characterized in that: described voltage detecting circuit (1) including:
Sensing bleeder circuit, is connected between described detection power supply and ground, its outfan output induced voltage；
Second IGCT (IC1), its gate pole controls conducting and shutoff, its plus earth of described second IGCT (IC1) according to the described induced voltage received；
3rd resistance (R3), its first end connects the negative electrode of described second IGCT (IC1), and its second end connects described detection power supply；
7th switching tube (Q2), it controls end and coupled to the first end of described 3rd resistance (R3) and control conducting and the shutoff of described 7th switching tube (Q2) according to the on or off of described second IGCT (IC1), its outfan coupled to described detection power supply and the outfan as described voltage detecting circuit (1) exports described first control signal, its 3rd end coupling grounding.
2. voltage monitoring circuit according to claim 1, it is characterised in that: described drive circuit (22) including:
First IGCT (IC2), its gate pole receives described first branch pressure voltage；
Second switch pipe (Q6), it controls end and connects the negative electrode of described first IGCT (IC2), and described second switch pipe (Q6) turns off when described first IGCT (IC2) is controlled by described first dividing potential drop and turns on；
3rd switching tube (Q7), it controls end and connects the outfan of described second switch pipe (Q6), described 3rd switching tube (Q7) turns on when described second switch pipe (Q6) turns off, and its outfan exports described driving signal as the drive output of described ON-OFF control circuit (2).
3. voltage monitoring circuit according to claim 2, it is characterized in that: between earth terminal and the ground of described second switch pipe (Q6), connect clamp circuit, including resistance and at least one diode, the anode of wherein said diode connects the earth terminal of described second switch pipe (Q6).
4. voltage monitoring circuit according to claim 3, it is characterized in that: described controlled division circuit (21) including: the bleeder circuit being in series by the first resistance (R8) and the second resistance (R9), and the 4th switching tube (Q3)；Wherein, the outfan of the 4th switching tube (Q3) is connected to the junction point of described the first resistance (R8) and the second resistance (R9) and provides described first branch pressure voltage, the control end of the 4th described switching tube (Q3) is coupled in the outfan of described voltage detecting circuit (1) and receives described first control signal, and it is high level that described first control signal controls the first branch pressure voltage described in when described 4th switching tube (Q3) turns off.
5. voltage monitoring circuit according to claim 4, it is characterised in that: being also connected with Voltage Cortrol electronic circuit between earth terminal and the ground of described second resistance, described Voltage Cortrol electronic circuit includes:
5th switching tube (Q4), it controls end and coupled to the outfan of described voltage monitoring circuit, and its colelctor electrode is connected to the control end of the 6th switch (Q5), its grounded emitter；
6th switching tube (Q5), it controls end and connects the colelctor electrode of described 5th switching tube (Q4), its colelctor electrode resistance of connecting is followed by the earth terminal to described second resistance (R9), its grounded emitter, another resistant series is between earth terminal and the ground of described second resistance (R9)；
Wherein, described 5th switching tube (Q4) turns on when described first switching tube (Q8) turns on, described 6th switching tube (Q5) turns off when described 5th switching tube (Q4) turns on simultaneously, makes the first branch pressure voltage of bleeder circuit be in high potential.
6. voltage monitoring circuit according to claim 1, it is characterized in that: the second outfan output abnormality prompting voltage of described ON-OFF control circuit (2) is to described voltage detecting circuit (1), and described voltage detecting circuit (1) also includes:
8th switching tube (Q1), it controls end and coupled to the negative electrode of the first IGCT (IC2) of described ON-OFF control circuit (2) the conducting of the 8th switching tube (Q1) and shutoff according to the described abnormal prompt Control of Voltage received, its colelctor electrode is coupled in described detection power supply, and its emitter stage connects the colelctor electrode of described 7th switching tube (Q2).
7. voltage monitoring circuit according to claim 6, it is characterized in that: the go-and-retum at described 3rd resistance (R3) is also connected with first light emitting diode (LR) too high for showing detection supply voltage, between outfan and the described detection power supply of described 8th switching tube (Q1), it is also connected with second light emitting diode (LY) too low for showing detection supply voltage, is also connected with between the control end and described detection power supply of second switch pipe (Q6) for showing detection normal 3rd light emitting diode (LG) of supply voltage；Wherein the anode of each light emitting diode connects described detection power supply.
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| CN201410125838.3A CN103957652B (en) | 2014-03-31 | 2014-03-31 | A kind of voltage monitoring circuit of DC ballast |
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| CN201410125838.3A CN103957652B (en) | 2014-03-31 | 2014-03-31 | A kind of voltage monitoring circuit of DC ballast |
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| CN103957652B true CN103957652B (en) | 2016-06-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854766A (en) * | 2010-04-23 | 2010-10-06 | 清华大学 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
| CN201709010U (en) * | 2009-06-24 | 2011-01-12 | 奥斯兰姆有限公司 | DC ballast and lighting device |
| CN203840627U (en) * | 2014-03-31 | 2014-09-17 | 浙江七星青和电子科技有限公司 | Voltage monitoring circuit for DC ballast |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6781326B2 (en) * | 2001-12-17 | 2004-08-24 | Q Technology Incorporated | Ballast with lamp sensor and method therefor |
| US7529107B2 (en) * | 2006-09-27 | 2009-05-05 | Osram Sylvania, Inc. | Power supply and electronic ballast with voltage clamping circuit |
| CN101868105B (en) * | 2010-05-28 | 2013-12-11 | 浙江大邦科技有限公司 | Electronic ballast and overvoltage protection method thereof |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201709010U (en) * | 2009-06-24 | 2011-01-12 | 奥斯兰姆有限公司 | DC ballast and lighting device |
| CN101854766A (en) * | 2010-04-23 | 2010-10-06 | 清华大学 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
| CN203840627U (en) * | 2014-03-31 | 2014-09-17 | 浙江七星青和电子科技有限公司 | Voltage monitoring circuit for DC ballast |
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