CN201464629U - Lamp service life end detecting circuit - Google Patents
Lamp service life end detecting circuit Download PDFInfo
- Publication number
- CN201464629U CN201464629U CN2009200753157U CN200920075315U CN201464629U CN 201464629 U CN201464629 U CN 201464629U CN 2009200753157 U CN2009200753157 U CN 2009200753157U CN 200920075315 U CN200920075315 U CN 200920075315U CN 201464629 U CN201464629 U CN 201464629U
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- control signal
- lamp
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- impedor
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Abstract
The utility model provides a detecting circuit used for detecting service life end state of lamps in electronic ballasts. The detecting circuit comprises a signal acquisition unit, a control signal generating unit and a switch unit, wherein the signal acquisition unit is used for acquiring lamp signals and providing the lamp signals for the control signal generating unit; the control signal generating unit is used for receiving the lamp signals acquired by the signal acquisition unit so as to generate a control signal and provide the control signal for the switch unit; and the switch unit is switched on so as to trigger a protecting circuit for controlling an electronic ballast to stop working when the control signal is larger than a first threshold value. When a lamp is in service life end state, the voltage and/or frequency of the lamp can rise. The detecting circuit can effectively detect the service life end state of the lamp and timely trigger the protecting circuit so as to control the electronic ballast to stop working, thereby effectively preventing the lamp in the service life end state from possibly damaging the electronic ballast and avoiding potential danger caused by a melted and broken lamp cap.
Description
Technical field
The utility model relates to lamp (the end of life) testing circuit of dying of old age, and relates in particular to the lamp that is used for magnet ring topology electric ballast (the ring core topology ballast) testing circuit of dying of old age.
Background technology
At present, low side electric ballast, especially magnet ring topology electric ballast do not comprise the lamp state protection function of dying of old age.In case lamp enters the lamp state of dying of old age, cause in time starting electronic ballast protecting circuit it is quit work owing to detecting this state, possibly electric ballast is caused damage.
In addition, in case lamp enters the lamp state of dying of old age, the electronics powder in the lamp tube ends filament exhausts, and it is hot to make that still in running order lamp begins, and the high temperature of the hot generation of fluorescent tube makes lamp holder fusing and rupturing probably, thereby the people under lamp is just caused injury.
The utility model content
The utility model proposes a kind of lamp status detection circuit of dying of old age that is used to detect in electric ballast, when lamp is in when dying of old age state, testing circuit triggers the holding circuit of electric ballast, quits work with the control electric ballast.This testing circuit is particularly useful for magnet ring topology electric ballast.
According to an embodiment of the present utility model, a kind of lamp status detection circuit of dying of old age that is used to detect in electric ballast is provided, described electric ballast also comprises holding circuit, this holding circuit can be controlled described electric ballast and quit work when lamp is died of old age state, wherein, described testing circuit comprises signal gathering unit, control signal generation unit and switch element, wherein, described signal gathering unit, be used to gather modulating signal and offer described control signal generation unit, described modulating signal characterizes the voltage magnitude and/or the frequency size at lamp two ends; Described control signal generation unit is used to receive modulating signal that described signal gathering unit collects to generate control signal and to offer described switch element; Described switch element is used for when described control signal during greater than first threshold, and conducting is to trigger described holding circuit.
When lamp is in when dying of old age state; the voltage magnitude at lamp two ends and/or frequency can raise; by the lamp of the present utility model state detection circuit of dying of old age; can detect the lamp state of dying of old age effectively; and in time trigger the holding circuit of electric ballast; quit work with the control electric ballast, thus infringement of having avoided lamp to die of old age state under effectively may causing electric ballast and lamp holder fusing and the danger of rupturing and may cause.
Optionally, described testing circuit also comprises anti-error protected location, and wherein, described anti-error protected location comprises division module and clamper module, and described division module is used for the dc bus voltage of described electric ballast is carried out dividing potential drop, to obtain first voltage; Described clamper module is used for when described dc bus voltage during less than second threshold value, and the control signal clamper that described control signal generation unit is generated is at first voltage, and described first voltage is less than described first threshold.
In most of magnet ring ballast resistor; lamp current can change along with the variation of supply voltage. when supply voltage reduces; lamp current will reduce and modulating voltage increases. when supply voltage less than the 3rd threshold value; be that the dc bus voltage of electric ballast is during less than second threshold value; the control signal that the increase of modulating voltage can cause the control signal generation unit to be generated increases to and makes switch element mislead; thereby the holding circuit of false triggering electric ballast. by the anti-error protected location in the testing circuit of the present utility model; can be at supply voltage less than the 3rd threshold value; be that the dc bus voltage of electric ballast is during less than second threshold value; the control signal clamper that the control signal generation unit is generated is at first voltage; wherein first voltage is less than first threshold, thereby avoided the false triggering to electronic ballast protecting circuit effectively.
Description of drawings
By reading below in conjunction with the description of accompanying drawing to indefiniteness embodiment, other purpose of the present utility model, feature and advantage will become more obvious and outstanding.
Fig. 1 shows and comprises and be used to detect the die of old age circuit module synoptic diagram of electric ballast of status detection circuit of lamp according to an embodiment of the present utility model;
Fig. 2 shows and comprises and be used to detect the die of old age circuit module synoptic diagram of electric ballast of status detection circuit of lamp according to another embodiment of the present utility model;
Fig. 3 shows and is used to detect the die of old age electrical block diagram of status detection circuit of lamp according to an embodiment of the present utility model;
Fig. 4 shows and is used to detect the die of old age electrical block diagram of status detection circuit of lamp according to another embodiment of the present utility model.
Wherein, same or analogous Reference numeral is represented same or analogous device (module).
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.
Fig. 1 shows and comprises and be used to detect the die of old age circuit module synoptic diagram of electric ballast of status detection circuit of lamp according to an embodiment of the present utility model.The ground that is without loss of generality comprises power supply 10, rectification circuit 20, circuit of power factor correction 30, inverter circuit 40, output network 50, testing circuit 60 and holding circuit 70 among Fig. 1.
The electric power that power supply 10 provides after the DC-AC of the correction of circuit of power factor correction 20 and inverter circuit 40 conversion, offers output network 50 by the rectification of rectification circuit 20, and the lamp that is used to drive wherein is luminous.
Wherein, power supply 10 is a civil power, and it is neglected city's electric standard of various countries greatly and decides.City's electric standard with China is an example, and power supply 10 is 220V, 50Hz, and it allows to have between 198～264V unsteady.
Circuit of power factor correction 30 can be APFC or passive power factor correcting circuit.Consider the cost control problem, generally speaking, in the low side electric ballast, use passive power factor correcting circuit morely.
Optionally, in electric ballast shown in Figure 1, can also comprise the electromagnetic interference filter circuit (not shown in figure 1), be used for the electromagnetic interference (EMI) from electrical network is fully decayed that the electromagnetic interference (EMI) that produces in the block electrons ballast resistor is invaded electrical network simultaneously.This one of ordinary skill in the art will appreciate that, does not give unnecessary details at this.
Among the figure, shown in the frame of broken lines is to be used to detect the lamp status detection circuit 60 of dying of old age, and this testing circuit 60 comprises signal gathering unit 601, control signal generation unit 602 and switch element 603.
The modulating signal that control signal generation unit 602 received signal collecting units 601 are collected is to generate control signal and to offer switch element 603.
When control signal during greater than first threshold, switch element 603 conductings are with trigger protection circuit 70, and wherein, holding circuit 70 is used to control electric ballast and quits work.
When lamp is in when dying of old age state, the voltage magnitude at lamp two ends and/or frequency can raise, and like this, the modulating signal that signal gathering unit 601 is collected will become greatly, thereby the control signal that makes control signal generation unit 602 be generated increases.When control signal increases to greater than first threshold, thereby switch element 603 conducting trigger protection circuit 70 are used to control electric ballast and quit work.
In most of magnet ring ballast resistor, lamp current can change along with the variation of supply voltage.When supply voltage reduced, lamp current will reduce and the modulating voltage increase.When supply voltage less than the 3rd threshold value; be that the dc bus voltage of electric ballast is during less than second threshold value; the control signal that the increase of modulating voltage can cause the control signal generation unit to be generated increases to and makes switch element mislead, thus the holding circuit of false triggering electric ballast.Based on this, optionally, also comprise anti-error protected location according to the testing circuit of an embodiment of the present utility model.
Fig. 2 shows and comprises and be used to detect the die of old age circuit module synoptic diagram of electric ballast of status detection circuit of lamp according to another embodiment of the present utility model.
Than Fig. 1, the testing circuit 60 among Fig. 2 has increased anti-error protected location 604 newly.Among the figure, shown in the frame of broken lines is anti-error protected location 604, and it comprises division module 6041 and clamper module 6042.
Need to prove that the supply voltage that power supply 10 is provided and the dc bus voltage of electric ballast are proportional.
Optionally, second threshold value is 200V, and the 3rd threshold value is 160V.
Under the situation of dc bus voltage less than second threshold value of electric ballast, because the control signal clamper that clamper module 6042 is generated control signal generation unit 602 is at first voltage, and first voltage is less than first threshold, therefore, the control signal that generated of control signal generation unit 602 can 603 conductings of false triggering switch element.
Below with reference to Fig. 3 the circuit structure according to the testing circuit of an embodiment of the present utility model is described in detail.
Fig. 3 shows and is used to detect the die of old age electrical block diagram of status detection circuit of lamp according to an embodiment of the present utility model.
Among the figure, three frame of broken lines shown in the testing circuit 60 are respectively signal gathering unit 601, control signal generation unit 602 and switch element 603.
Wherein, first capacitive reactive element 6011 is used for the DC component of filtering modulating signal, to prevent this DC component the signal Processing of follow-up functional module is produced interference.
In addition, when lamp is in when dying of old age state, except modulating voltage (amplitude), it is big that modulation frequency also can become.First capacitive reactive element 6011 can be in response to the variation of modulation frequency, and when modulation frequency became big, the capacitive reactance of first capacitive reactive element 6011 reduced, thereby makes signal gathering unit 601 can collect the variation of modulating voltage and modulation frequency simultaneously.
Optionally, first capacitive reactive element 6011 is made up of one or more electric capacity, and first impedor 6012 is made up of one or more resistance.
Control signal generation unit 602 comprises first diode 6021 and the RC network of being made up of 6022, the second groups of resistance 6023 of first group of resistance and first capacitor 6024.
The modulating signal that signal gathering unit 601 is collected offers RC network after via 6021 rectifications of first diode.As shown in Figure 3, charge by 6023 pairs first capacitors 6024 of second group of resistance through the modulating signal after 6021 rectifications of first diode.After charging was finished, the electric charge that stores in first capacitor 6024 discharged by second group of resistance 6023 and first group of resistance 6022.So repeat.
Because the discharge time constant of above-mentioned RC network is greater than charging rate, therefore, the charge energy that stores in first capacitor 6024 accesses accumulation.
Charges accumulated offers switch element 603 as control signal in first capacitor 6024.
Need to prove, the resistance of first group of resistance 6022 should be greater than the resistance of second group of resistance 6023, like this, when being applied on the RC network through the modulating signal after 6021 rectifications of first diode, it is 6024 chargings of first capacitor that most of electric current flows through second group of resistance 6023, and only has the sub-fraction electric current to flow through first group of resistance 6022.
Optionally, the resistance of first group of resistance 6022 is 3～5 times of second group of resistance 6023.
Another need to prove, usually, when lamp just started, the voltage at lamp two ends can be than higher, thereby the modulating signal that causes signal gathering unit 601 to be collected is bigger.The electric charge that stores in first capacitor 6024 when preventing that lamp from just having started is accumulated in a short period of time greater than first threshold; and make switch element 603 mislead and false triggering holding circuit 70; optionally; the value size of second group of resistance 6023 is million grades, to slow down the charging rate to first capacitor 6024.
Optionally, first group of resistance 6022 and second group of resistance 6023 can be made up of one or more resistance respectively.
As shown in Figure 3, switch element 603 comprises voltage stabilizing diode 6031.
When lamp is in when dying of old age state, it is big that the modulating signal that signal gathering unit 601 is collected becomes, and charges accumulated increases in the capacitor 6024 of winning thereby make, and causes control signal to increase.When control signal increases to greater than first threshold, voltage stabilizing diode 6031 reverse-conductings.
After voltage stabilizing diode 6031 conductings, trigger protection circuit 70 quits work with the control electric ballast.
Optionally, as shown in Figure 3, holding circuit 70 comprises controllable silicon 701.
The control utmost point of controllable silicon 701 connects the anode of voltage stabilizing diode 6031, the plus earth of controllable silicon 701, and anode connects inverter circuit 40.
Optionally, inverter circuit 40 is a half-bridge inversion circuit.Usually, comprise side switch and side switch in the half-bridge inversion circuit, it is luminous in order to drive lamp that side switch and side switch are taken turns conducting.Alternatively, half-bridge inversion circuit is a magnet ring topology half-bridge oscillation circuit.The principle of work of half-bridge inversion circuit is a prior art, and this is that those skilled in the art will be understood that, for simplicity's sake, does not give unnecessary details at this.
When inverter circuit 40 is half-bridge inversion circuit, the base stage of side switch or side switch in the anode of the controllable silicon 701 connection half-bridge inversion circuit.
When control signal during greater than first threshold, voltage stabilizing diode 6031 conductings, thereby trigger controllable silicon 701 conductings. after controllable silicon 701 conductings, the base potential of side switch or side switch is dragged down in the half-bridge inversion circuit, make side switch or side switch turn-off, half-bridge inversion circuit quits work.
Fig. 4 shows and is used to detect the die of old age electrical block diagram of status detection circuit of lamp according to another embodiment of the present utility model.
Than Fig. 3, also comprise anti-error protected location 604 in the testing circuit 60 shown in Figure 4.
Among the figure, two frame of broken lines shown in the anti-error protected location 604 are respectively division module 6041 and clamper module 6042.
As shown in Figure 4, the 3rd impedor 60412 is connected with second impedor 60411 with second capacitive reactive element, 60413 backs in parallel.First voltage obtains from the node of second impedor unit the 60411 and the 3rd impedor 60412.
Need to prove that second capacitive reactive element 60413 is selectable units.
Generally speaking, use the dc bus voltage of the electric ballast of passive power factor correcting circuit to stablize inadequately, thereby make first voltage that is undertaken obtaining after the dividing potential drop by 6041 pairs of these dc bus voltages of division module that bigger ripple be arranged.Second capacitive reactive element 60413 is used for this first voltage is carried out filtering, to reduce its ripple.
At the dc bus voltage of electric ballast less than second threshold value, be under the situation of supply voltage that provide of power supply 10 less than the 3rd threshold value, in case the control signal that control signal generation unit 602 generates is greater than first voltage, 60421 conductings of second diode, electric current flows through the 3rd impedor 60412 via second diode 60421, thus with this control signal clamper at first voltage, wherein, first voltage is less than first threshold, thereby avoided misleading of voltage stabilizing diode 6031 effectively.
Optionally, second impedor 60411 and the 3rd impedor 60412 can be made up of one or more resistance respectively.Second capacitive reactive element 60413 can be made up of one or more electric capacity.
Although sets forth in detail and described the utility model in accompanying drawing and aforesaid description should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The utility model is not limited to above-mentioned embodiment.
The those skilled in the art in those present technique fields can be by research instructions, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the embodiment of disclosure.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In practical application of the present utility model, the function of a plurality of technical characterictics of being quoted during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.
Claims (11)
1. one kind is used to detect the lamp status detection circuit of dying of old age in electric ballast; described electric ballast also comprises holding circuit; this holding circuit can be controlled described electric ballast and quit work when lamp is died of old age state; wherein; described testing circuit comprises signal gathering unit; control signal generation unit and switch element, wherein
Described signal gathering unit is used to gather modulating signal and offers described control signal generation unit, and described modulating signal characterizes the voltage magnitude and/or the frequency size at lamp two ends;
Described control signal generation unit is used to receive modulating signal that described signal gathering unit collects to generate control signal and to offer described switch element;
Described switch element is used for when described control signal during greater than first threshold, and conducting is to trigger described holding circuit.
2. testing circuit according to claim 1, wherein, described signal gathering unit comprises first capacitive reactive element and first impedor, described modulating signal is gathered from described first capacitive reactive element and the first impedor node.
3. testing circuit according to claim 1, wherein, described control signal generation unit comprises the RC network and first diode, the modulating signal that described signal gathering unit collects offers described RC network after via described first diode rectification, and the output signal of described RC network offers described switch element as control signal.
4. testing circuit according to claim 3, wherein, described RC network comprises first capacitor, first group of resistance and second group of resistance, described first group of resistance and second group of resistance series connection back are in parallel with described first capacitor, the negative electrode of described first diode is connected the node place of described first group of resistance and second group of resistance, the output terminal that anode is connected described signal acquisition module, and the voltage at the described first capacitor two ends offers described switch element as control signal.
5. testing circuit according to claim 1, wherein, described switch element comprises voltage stabilizing diode.
6. testing circuit according to claim 1, wherein, described testing circuit also comprises anti-error protected location, wherein, described anti-error protected location comprises division module and clamper module,
Described division module is used for the dc bus voltage of described electric ballast is carried out dividing potential drop, to obtain first voltage;
Described clamper module is used for when described dc bus voltage during less than second threshold value, and the control signal clamper that described control signal generation unit is generated is at first voltage, and described first voltage is less than described first threshold.
7. testing circuit according to claim 6, wherein, described division module comprises second impedor and the 3rd impedor, described first voltage obtains from described second impedor and the 3rd impedor node.
8. testing circuit according to claim 7, wherein, described division module also comprises second capacitive reactive element, connects with described second impedor after described second capacitive reactive element and described the 3rd impedor parallel connection.
9. according to claim 7 or 8 described testing circuits, described clamper module comprises second diode, and output terminal, negative electrode that the anode of described second diode is connected described control signal generation unit are connected second impedor and the 3rd impedor node place.
10. electric ballast that is used for gas-discharge lamp comprises holding circuit and as each described testing circuit in the claim 1 to 9.
11. electric ballast according to claim 10, wherein, described holding circuit comprises controllable silicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200753157U CN201464629U (en) | 2009-07-27 | 2009-07-27 | Lamp service life end detecting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200753157U CN201464629U (en) | 2009-07-27 | 2009-07-27 | Lamp service life end detecting circuit |
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| CN201464629U true CN201464629U (en) | 2010-05-12 |
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| CN2009200753157U Expired - Fee Related CN201464629U (en) | 2009-07-27 | 2009-07-27 | Lamp service life end detecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495304A (en) * | 2011-11-23 | 2012-06-13 | 上海亚明灯泡厂有限公司 | Detection and protection circuit for EOL state of HID light source |
| CN102914734A (en) * | 2011-08-04 | 2013-02-06 | 台达电子企业管理（上海）有限公司 | End life detection circuit of gas discharge lamp and ballast for ending life detection circuit |
-
2009
- 2009-07-27 CN CN2009200753157U patent/CN201464629U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914734A (en) * | 2011-08-04 | 2013-02-06 | 台达电子企业管理（上海）有限公司 | End life detection circuit of gas discharge lamp and ballast for ending life detection circuit |
| CN102914734B (en) * | 2011-08-04 | 2015-04-08 | 台达电子企业管理（上海）有限公司 | End life detection circuit of gas discharge lamp and ballast for ending life detection circuit |
| CN102495304A (en) * | 2011-11-23 | 2012-06-13 | 上海亚明灯泡厂有限公司 | Detection and protection circuit for EOL state of HID light source |
| CN102495304B (en) * | 2011-11-23 | 2015-07-01 | 上海亚明灯泡厂有限公司 | Detection and protection circuit for EOL state of HID light source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20170727 |