CN101541130A - End of Lamp life protective circuit for high-strength discharge lamp - Google Patents
End of Lamp life protective circuit for high-strength discharge lamp Download PDFInfo
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- CN101541130A CN101541130A CN 200810085475 CN200810085475A CN101541130A CN 101541130 A CN101541130 A CN 101541130A CN 200810085475 CN200810085475 CN 200810085475 CN 200810085475 A CN200810085475 A CN 200810085475A CN 101541130 A CN101541130 A CN 101541130A
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Abstract
The invention discloses an end of lamp life protective circuit in a ballast control circuit of a high-strength discharge lamp, which comprises a feedback circuit and a timing circuit, wherein the feedback circuit is used for detecting the current state of the high-strength discharge lamp and generating a first control signal corresponding to the state; and the timing circuit is used for outputting a cut-off signal to cut off the operation of a ballast in the high-strength discharge lamp at the time of reaching definite time, and changes a timing value thereof according to the first control signal provided by the feedback circuit. The invention also discloses the ballast control circuit comprising the end of lamp life protective circuit, and the high-strength discharge lamp comprising the ballast control circuit.
Description
Technical field
The present invention relates to field of illuminating device, relate in particular to a kind of lamp end of Lamp life protective circuit and corresponding ballast control circuit and high-intensity discharge lamp that is used for the ballast control circuit of high-intensity discharge lamp.
Background technology
High-intensity discharge lamp (HID lamp) is grown owing to the life-span and can expeditiously electric energy be converted into light and obtained using widely.Typical HID lamp type comprises mercury (steam) lamp, sodium vapor lamp and metal halide lamp.The HID lamp generally all comprises lamp base, glass shell, electrode, arc-tube and metal support etc., and the difference of dissimilar lamps is coating, electrode, the size of arc-tube and the difference of managing the type of interior inert gas of filling in the glass shell.
For the lamp life termination of HID lamp, generally speaking can there be three reasons: 1, electrode degradation; 2, arc-tube fragmentation; And 3, the evaporation of salt (for example sodium salt).Above-mentioned reason 1 and 3 generally can not cause problem, this is because under above-mentioned 1 and 3 situation, the modulating voltage and/or the peak value of lighting a fire again will rise, and finally cause can not using at certain time modulation in the future, and can make the HID lamp resume work this moment by replacing old HID lamp.
Yet above-mentioned reason 2 can cause some problems.Be under the situation of sodium vapor lamp for example at the HID lamp, if arc-tube fragmentation, then the sodium salt in the arc-tube can enter into the residing glass shell of arc-tube, owing to generally all be filled with the inert gas of low pressure in the glass shell of HID lamp, therefore can in the glass shell of HID lamp, form certain type low pressure mercury lamp this moment, and the metal support that is used for supporting arc-tube will play electrode.In this stage, there is so-called in a large number " aura-arc light " conversion phenomena.Simultaneously, during this stage, it is lower that the temperature of lamp rises, therefore also within the critical condition of lamp and ballast (but ballast must stand the high electric current of high current changing rate di/dt).But, owing to be not suitable for being used as the electrode of low pressure mercury lamp at present as the metal of electrode, so this electrode can volatilize metallic particles.These metallic particles will be settled out metallic film in the position near lamp base in glass shell.Along with constantly carrying out of " aura-arc light " conversion, this metallic film is precipitation constantly, and finally can and metal support contact, metallic film plays conductor at this moment.At this moment, the HID lamp has entered " incandescent lamp pattern ".Under this pattern, metallic film plays resistance, and will obtain electric energy from ballast.In most of the cases, the impedance of metallic film is lower, and therefore, ballast can all be delivered to this metallic film to most energy.Because a large amount of electric currents flows through metallic film and the final lamp base that flows into, this cause lamp base since heating and temperature up to 600 ℃, this is well beyond the temperature (being generally 350 ℃) that generally can bear of lamp base.Therefore above-mentioned reason 2 can cause lamp base because temperature is too high and impaired, at this moment, resumes work in order to make the HID lamp, just not only needs to replace the HID lamp, but also needs to replace lamp base, and this can cause the increase of cost.
Usually, if can within the HID lamp enters after operating with " aura-arc light " translative mode 4-6 minute, disconnect ballast, then the HID lamp does not also enter " incandescent lamp pattern ", and lamp base can be too not high and impaired because of temperature, can think that this moment, system was in a safe condition down.
Summary of the invention
The problem that the present invention will solve is how to disconnect ballast apace after the HID lamp enters in " aura-arc light " translative mode owing to arc-tube is broken to damage owing to temperature is too high to prevent lamp base.
Another problem that the present invention will solve is how to utilize a timer circuit to realize being used for the timing of thermolamp igniting and HID lamp simultaneously to disconnect the required timing of ballast apace after entering " aura-arc light " translative mode.
In the existing ballast control circuit, had a timer that is used for the thermolamp igniting, its timing length is generally 15-30 minute.If this timer also can be used for aforesaid situation so that cut off ballast within 4-6 minute timing simultaneously, then can significantly reduce the scale of circuit and save circuit cost.
In order to address the above problem, the applicant is being under the thermolamp igniting and the mode of operation that is under " aura-arc light " translative mode is analyzed to ballast control circuit.The applicant finds, when in thermolamp ignition operation state following time, owing to need light a fire to thermolamp, therefore needs firing pulse, and in " aura-arc light " translative mode following time, then do not need firing pulse.In addition, under the normal manipulation mode of HID lamp and under " aura-arc light " translative mode, there is obviously difference in the power that flows through the HID lamp, and generally speaking, the operand power of normal manipulation mode is obviously greater than the operand power under " aura-arc light " translative mode.Based on above-mentioned feature, the applicant improves the existing timer that is used for the thermolamp ignition operation, makes this timer have different timings under different operator schemes, thereby has solved the problems referred to above.
Particularly, according to a first aspect of the invention, provide a kind of lamp end of Lamp life protective circuit that is used for the ballast control circuit of high-intensity discharge lamp, having comprised: feedback circuit, be used to detect the current state of high-intensity discharge lamp, and generate and corresponding first control signal of this state; And timing circuit, being used for when reaching a certain timing, the output shutoff signal is cut off the operation of the ballast in the described high-intensity discharge lamp, and wherein said timing circuit changes its timing value according to first control signal that feedback circuit provided.
According to another aspect of the present invention, also provide a kind of ballast control circuit of above-mentioned lamp end of Lamp life protective circuit and high-intensity discharge lamp that comprises this ballast control circuit of comprising.
Description of drawings
Now will be only by way of example and embodiment with reference to the accompanying drawings to describe the present invention, wherein:
Fig. 1 is the circuit theory diagrams of ballast control circuit according to the preferred embodiment of the present invention; And
Fig. 2 is the schematic circuit diagram according to the preferred embodiment for the present invention, the timing unit 105 that uses in ballast control circuit shown in Figure 1.
Embodiment
Referring to Fig. 1, wherein show the circuit theory diagrams of ballast control circuit 100 according to the preferred embodiment of the present invention.Ballast control circuit 100 comprises control unit 101, power supply unit 102, the unit 103 of lighting a fire/keep, feedback unit 104 and timing unit 105.Control unit 101 receives the operation that extraneous input signal Si n controls other each unit.
The feedback signal Sr that power supply unit 102 is provided according to feedback unit 104, under the control of control unit 101 to lighting a fire/keep unit 103 power supply.Because the characteristic of HID lamp, before and after the HID lamp was lighted, all voltage Vp were also different to unit 103 power supplies of lighting a fire/keep for power supply unit 102, preferably, before the HID lamp was lighted, supply power voltage Vp was 500V, and after HID was lighted, supply power voltage Vp was reduced to 400V.
Light a fire/keep unit 103 under the control of control unit 101, carry out HID lamp ignition operation, and after the HID lamp is lighted, carry out the control operation of HID lamp operate as normal.
In addition, feedback unit 104 is also monitored the operand power of HID lamp, and obtains the signal Sp of indication HID lamp operand power from the unit 103 of lighting a fire/keep, and produces the control signal Sc that is used to control timing unit 105 according to this signal.Preferably, when the HID lamp is in normal operating state following time, the operand power of this moment is bigger, therefore the control signal Sc that is produced is a high level, and the HID lamp is under " aura-arc light " translative mode, and this moment, operand power was lower, so control signal Sc is a low level.
Simultaneously, the control of the control signal Sc that provided by feedback unit 104 also is provided timing unit 105.Preferably, when control signal Sc is high level, stop the operation of timing unit 105, and preferably timing data is wherein reset.And when control signal Sc is low level, start the operation of timing unit 105.That is to say that timing unit 105 also is subjected to the control of the operator scheme of HID lamp, when the normal running of HID lamp, timing unit 105 does not carry out fixed cycle operator, therefore just can not export and cut off control signal Scut.And during HID lamp abnormal operation, timing unit 105 just begins fixed cycle operator.
Describe the operating process of each circuit block in the preferred embodiment of the present invention below in detail.
When ballast control circuit 100 is in the thermal ignition operator scheme, when the igniting beginning, because the HID lamp is not also lighted, so the S1 signal is low, the Sr signal is high thus, when power supply unit 102 is high at the Sr signal, provide high supply power voltage (for example 500V), high supply power voltage causes lighting a fire/keeps unit 103 to carry out normal ignition.At HID lamp ignition phase, its operand power also is lower than the HID lamp and lights the power of back during normal running, and therefore, the control signal Sc that feedback unit 104 provides remains low level, so timing unit 105 is in running order.Simultaneously, make that the timing length of timing unit 105 is longer, be in required timing under the thermolamp ignition operation pattern, if so that preferred lamp can't be lighted the time, after 20 minutes, cut off ballast to be applicable to the HID lamp because the Sr signal is a high level.After HID was lighted, the S1 signal uprised, and Sr signal step-down thus, power supply unit 102 provide low suppling voltage (for example, 400V), ignition operation is no longer carried out in the unit 103 of therefore lighting a fire/keep, and keeps operation normally but carry out.At this moment, the HID lamp is in normal operating state, so the control signal Sc that feedback unit 104 is provided is a high level, has therefore interrupted the operation of timing unit 105, makes ballast continue operate as normal.
When entering in " aura-arc light " translative mode owing to arc-tube is broken owing to the HID lamp, because the power the when operand power of HID lamp is lower than normal running at this moment, so the control signal Sc that feedback unit 104 provides becomes low level, so timing unit 105 is started working.Lamp still remains illuminating state simultaneously, and therefore, the S1 signal is high, the Sr signal is low, so that the timing length of timing unit 105 is shorter, be in required timing under " aura-arc light " translative mode to be applicable to the HID lamp, so that preferably after 5 minutes, cut off ballast.
This shows, by detecting the illuminating state and the operand power of HID lamp, come switch timing unit 105 according to the operand power of HID lamp, and the timing length of coming corresponding modify timing unit 105 according to this state, originally only be used for thermolamp and light timing unit 105 regularly and also can be used for fast shut-off ballast under " aura-arc light " translative mode now.
Should be noted that, in the accompanying drawings, only the form with circuit module figure shows and the closely-related part of theme of the present invention, except that timing unit 105, the inner separately concrete structure of these circuit modules is known in the prior art, therefore in order to make description of the invention more succinct, there is not concrete structure in these modules this illustrate.
Fig. 2 shows the illustrative circuitry structure and the use therein timer 2 01 of timing unit 105 according to a preferred embodiment of the invention.As shown in Figure 2, critical piece in the timing unit 105 is a counter 201, it comprises an input pin CEOL and output pin EOL, the external oscillating capacitor of input pin CEOL, counter carries out frequency division counter to oscillating impulse, and when counting reached a certain amount of, Scut cut off the power supply of control unit and disconnects ballast simultaneously at output pin EOL output high level signal.Preferably, the frequency divider that uses in counter is 17 grades of frequency dividers, and after full 120,000 oscillating impulses of counting, at output pin EOL output high level signal Scut.
For counter 201, can adjust frequency of oscillation by the size of adjusting input pin CEOL CSET, change timing at output pin EOL output high level signal Scut.As shown in Figure 2, C120 is linked between CEOL and the ground, in addition, and C
*With transistor switch Q
*Also serial chain is connected between CEOL and the ground.Transistor Q
*Sr is controlled by signal, when Sr is high level, and transistor Q
*Conducting, C120 and C at this moment
*Be connected in parallel, the size of the external capacitor of CEOL equals electric capacity+C of C120
*Electric capacity, and the external capacitor of CEOL is bigger, then frequency of oscillation is lower, so timer is regularly longer, for example 20 minutes.And when Sr is low level, transistor Q
*Disconnect, the external capacitor of CEOL only is C120, and this moment, the external capacitor of CEOL was less, and frequency of oscillation is higher, so timer is regularly shorter, for example is 5 minutes.Certainly, transistor Q
*Also can be substituted by any switch element that can finish similar functions.
Preferably, for the timings in 5 minutes that obtain to be applicable to timing in 20 minutes of thermolamp ignition mode and be applicable to " aura-arc light " translative mode, the electric capacity of C120 is 33nF, and C
*Electric capacity be 68nF.
Thus, by the external capacitor size that the level according to signal Sr comes the input pin CEOL of corresponding modify counter 201, can make counter 201 can be applied to above-mentioned two kinds of different operation modes simultaneously.Therefore, by existing timing circuit is carried out minor modifications, can be implemented in the HID lamp and disconnect ballast apace after entering in " aura-arc light " translative mode owing to arc-tube is broken and damage owing to temperature is too high to prevent lamp base.
Should be pointed out that the foregoing description has illustrated rather than limited the present invention, those skilled in the art can design many interchangeable embodiment and not depart from the scope of the present invention that is defined by the following claims.In the claims, any Reference numeral of bracket that places should not be regarded as having limited these claims.Word " comprises ", " comprising " or the like do not get rid of and have element or step unlisted in any claim or the whole specification.The singular reference of element is not got rid of plural reference to this class component, and vice versa.The present invention can be by means of the hardware that has comprised some different elements with by means of realizing through the computer of suitably programming.In having enumerated the equipment claim of some devices, some in these devices can be implemented by same hardware branch.This is minimum true and do not mean that the combination that cannot utilize these technical measures for some technical measures of repeated citing in mutually different dependent claims.
Claims (8)
1, a kind of lamp end of Lamp life protective circuit at the ballast control circuit that is used for high-intensity discharge lamp comprises:
Feedback circuit is used to detect the current state of high-intensity discharge lamp, and generates and corresponding first control signal of this state; And
Timing circuit is used for when reaching a certain timing, and the output shutoff signal is cut off the operation of the ballast in the described high-intensity discharge lamp,
Wherein said timing circuit changes its timing value according to first control signal that feedback circuit provided.
2, lamp end of Lamp life protective circuit as claimed in claim 1, wherein
First control signal that described feedback circuit generates is relevant with the lamp illuminating state of described high-intensity discharge lamp, and described feedback circuit also generates second control signal relevant with the operand power of high-intensity discharge lamp; And
Described second control signal is used for the described timing circuit of switch.
3, lamp end of Lamp life protective circuit as claimed in claim 1, wherein said timing circuit comprises:
Counter has output pin and input pin, and described input pin connects oscillating capacitance, described counter is counted the oscillating impulse at input pin place, with when described oscillating impulse counting reaches a certain amount of, export described shutoff signal at described output pin
The capacitance of wherein said oscillating capacitance changes according to described first control signal value.
4, lamp end of Lamp life protective circuit as claimed in claim 3, wherein said timing circuit also comprises:
First capacitor is coupled between described input pin and the ground; And
Second capacitor and the switch that are connected in series, described second capacitor and switch also are coupled between described input pin and the ground, and switch is according to first control signal value and conducting or disconnection.
5, lamp end of Lamp life protective circuit as claimed in claim 4, the switch in the wherein said timing circuit is a transistor, its ground level links to each other with described feedback circuit, to obtain first control signal that described feedback circuit is generated.
6, lamp end of Lamp life protective circuit as claimed in claim 4, wherein:
Described timing circuit had two timing values promptly 5 minutes and 20 minutes;
Described counter is exported described shutoff signal at described output pin after counting reaches 120,000 oscillating impulses; And
Described first capacitor has the capacitance of 33nF, and described second capacitor has the capacitance of 68nF.
7, a kind of ballast control circuit that is used for high-intensity discharge lamp has as any described lamp end of Lamp life protective circuit among the claim 1-6.
8, a kind of high-intensity discharge lamp has ballast control circuit, and described ballast control circuit has as any described lamp end of Lamp life protective circuit among the claim 1-6.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810085475 CN101541130A (en) | 2008-03-19 | 2008-03-19 | End of Lamp life protective circuit for high-strength discharge lamp |
| PCT/IB2009/051085 WO2009115983A1 (en) | 2008-03-19 | 2009-03-17 | End-of-life protection circuit for high-intensity discharge lamp |
| CN200980109528XA CN101978790A (en) | 2008-03-19 | 2009-03-17 | End-of-life protection circuit for high-intensity discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810085475 CN101541130A (en) | 2008-03-19 | 2008-03-19 | End of Lamp life protective circuit for high-strength discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101541130A true CN101541130A (en) | 2009-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810085475 Pending CN101541130A (en) | 2008-03-19 | 2008-03-19 | End of Lamp life protective circuit for high-strength discharge lamp |
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| Country | Link |
|---|---|
| CN (1) | CN101541130A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742802A (en) * | 2010-01-07 | 2010-06-16 | 北京经纬恒润科技有限公司 | Control method, device and system of high-intensity discharge lamp |
| 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 |
-
2008
- 2008-03-19 CN CN 200810085475 patent/CN101541130A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742802A (en) * | 2010-01-07 | 2010-06-16 | 北京经纬恒润科技有限公司 | Control method, device and system of high-intensity discharge lamp |
| CN101742802B (en) * | 2010-01-07 | 2013-01-09 | 北京经纬恒润科技有限公司 | Control method, device and system of high-intensity discharge lamp |
| 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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Open date: 20090923 |