CN102762020B - Fluorescent lamp and open circuit protecting circuit thereof - Google Patents
Fluorescent lamp and open circuit protecting circuit thereof Download PDFInfo
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- CN102762020B CN102762020B CN201110111224.6A CN201110111224A CN102762020B CN 102762020 B CN102762020 B CN 102762020B CN 201110111224 A CN201110111224 A CN 201110111224A CN 102762020 B CN102762020 B CN 102762020B
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Abstract
The invention is applied to the field of electronic illumination and provides a fluorescent lamp and an open circuit protecting circuit thereof. The open circuit protecting circuit of the fluorescent lamp comprises a rectifier filtering unit, a dividing unit and a half-bridge suppression unit. According to the fluorescent lamp and the open circuit protecting circuit thereof disclosed by the invention, a high-voltage direct current signal output by a self-exciting half bridge circuit of the fluorescent lamp is sampled, rectified and filtered by the rectifier filtering unit and is divided by the dividing unit for providing a trigger electrical signal for the half-bridge suppression unit; the triggered half-bridge suppression unit enters a work state to suppress the self-exciting half bridge circuit of the fluorescent lamp to work and enable the self-exciting half bridge circuit to stop oscillation, and thus the aim that the high-voltage electric shock risk is eliminated because no voltage is output from the output end of the self-exciting half bridge circuit of the fluorescent lamp when the fluorescent lamp is in open circuit or no fluorescent lamp body is connected is achieved.
Description
Technical field
The invention belongs to field of electronic illumination, particularly relate to a kind of fluorescent lamp and open loop protection circuit thereof.
Background technology
At present, self-ballasted fluorescent lamp, as a kind of conventional light fixture, has been widely used in the middle of daily life.
Existing most self-ballasted fluorescent lamp circuit structure is simple, cheap for manufacturing cost; self-ballasted fluorescent lamp generally includes fluorescent lamp lamp body and fluorescent lamp self-excited half-bridge circuit, and existing self-ballasted fluorescent lamp does not arrange open loop protection circuit or the open loop protection circuit that adopts and imperfection.But, fluorescent lamp self-excited half-bridge circuit is when self-ballasted fluorescent lamp open circuit or the access of unstressed configuration lamp lamp body, its output end voltage is the several times of normal working voltage, can reach hundreds of volt high pressure, and the high voltage output of fluorescent lamp self-excited half-bridge circuit can cause self-ballasted fluorescent lamp to there is the danger of high pressure electric shock when opening a way or unstressed configuration lamp lamp body accesses.
Summary of the invention
The object of the present invention is to provide a kind of fluorescent lamp open loop protection circuit, be intended to solve existing self-ballasted fluorescent lamp exists high pressure Danger Electric shock risk problem when opening a way or accessing without electricity-saving lamp.
The present invention is achieved in that a kind of fluorescent lamp open loop protection circuit, is connected with fluorescent lamp self-excited half-bridge circuit, and described fluorescent lamp open loop protection circuit comprises:
Input is connected with the output of fluorescent lamp self-excited half-bridge circuit, carries out sampling and the rectification filtering unit of rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit exports;
Input is connected with the output of described rectification filtering unit, the high voltage direct current signal of telecommunication exported is carried out to the partial pressure unit of voltage division processing from described rectification filtering unit;
Input is connected with the output of described partial pressure unit, and output is connected with the input of described fluorescent lamp self-excited half-bridge circuit, to the half-bridge suppression unit that fluorescent lamp self-excited half-bridge circuit suppresses.
Another object of the present invention is to provide a kind of fluorescent lamp comprising above-mentioned fluorescent lamp open loop protection circuit.
In the present invention, by rectification filtering unit, sampling is carried out and rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit exports, for half-bridge suppression unit provides the triggering signal of telecommunication after carrying out dividing potential drop by partial pressure unit to the high voltage direct current signal of telecommunication again, operating state is entered after half-bridge suppression unit is triggered, Fluorophotometry lamp self-excited half-bridge circuit working, make its failure of oscillation, when reaching fluorescent lamp open circuit or the access of unstressed configuration lamp lamp body, fluorescent lamp self-excited half-bridge circuit output end Non voltage output, eliminates the object of high pressure Danger Electric shock risk.
Accompanying drawing explanation
Fig. 1 is the module map of the fluorescent lamp open loop protection circuit that the embodiment of the present invention provides;
Fig. 2 is the exemplary circuit figure of the fluorescent lamp open loop protection circuit that provides of the embodiment of the present invention and fluorescent lamp self-excited half-bridge circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the modular structure of the fluorescent lamp open loop protection circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows.
Fluorescent lamp open loop protection circuit 100 comprises:
Rectification filtering unit 101, partial pressure unit 102 and half-bridge suppression unit 103.
The input of rectification filtering unit 101 is connected with the output of fluorescent lamp self-excited half-bridge circuit 200, carries out sampling and rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit 200 exports;
The input of partial pressure unit 102 is connected with the output of rectification filtering unit 101, carries out voltage division processing to the high voltage direct current signal of telecommunication exported from rectification filtering unit 101;
The input of half-bridge suppression unit 103 is connected with the output of partial pressure unit 102, and output is connected with the input of fluorescent lamp self-excited half-bridge circuit 200, suppresses fluorescent lamp self-excited half-bridge circuit 200.
Fig. 2 shows the exemplary circuit structure of fluorescent lamp open loop protection circuit that the embodiment of the present invention provides and fluorescent lamp self-excited half-bridge circuit, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows.
As one embodiment of the invention, fluorescent lamp self-excited half-bridge circuit 200 comprises resistance R1, diode D2, bidirectional trigger diode DB1, triode Q1, triode Q3, diode D3, diode D4, resistance R2, resistance R4, resistance R5, resistance R6, resistance R7, resistance R10, transformer T1, electric capacity C1 and magnetizing inductance device T2, the first termination fluorescent lamp circuit direct current input anode Vbus+ of resistance R1, second end of resistance R1 is connected with the anode of diode D2 and the first end of bidirectional trigger diode DB1 simultaneously, second end of the negative electrode connecting resistance R4 of diode D2, second end of bidirectional trigger diode DB1 is the input of fluorescent lamp self-excited half-bridge circuit 200, be connected with the base stage of triode Q3, the collector electrode of triode Q1 meets fluorescent lamp circuit direct current input anode Vbus+, the emitter of triode Q1 is connected with the first end of resistance R4, the base stage of triode Q1 is connected with the first end of resistance R2 and the first end of resistance R5 simultaneously, the first end of second termination transformer T1 first armature winding of resistance R2, the negative electrode of the second terminating diode D3 of resistance R5, the anode of diode D3 is connected with second end of second end of resistance R4 with first armature winding of transformer T1 simultaneously, second end of the collector electrode connecting resistance R4 of triode Q3, the first end of the emitter connecting resistance R10 of triode Q3, the second end ground connection of resistance R10, the base stage of triode Q3 is connected with the first end of resistance R6 and the first end of resistance R7 simultaneously, the negative electrode of the second terminating diode D4 of resistance R6, the first end of second armature winding of the second termination transformer T1 of resistance R7, second end of second armature winding of transformer T1 and the anode of diode D4 ground connection simultaneously, the first end of the first termination capacitor C1 of the secondary winding of transformer T1, the first end of the second termination magnetizing inductance device T2 of electric capacity C1, second end of magnetizing inductance device T2 is the output of fluorescent lamp self-excited half-bridge circuit 200.
As one embodiment of the invention, rectification filtering unit 101 comprises rectifier diode D5 and filter capacitor C4, the anode of rectifier diode D5 is the input of rectification filtering unit 101, the negative electrode of rectifier diode D5 is the output of rectification filtering unit 101, between the negative electrode that filter capacitor C4 is connected to rectifier diode D5 and ground.
As one embodiment of the invention, partial pressure unit 102 comprises resistance R9 and resistance R12, and the first end of resistance R9 is the input of partial pressure unit 102, and the second segment of resistance R9 is the output of partial pressure unit 102, and resistance R12 is connected between second end of resistance R9 and ground.
As one embodiment of the invention, half-bridge suppression unit 103 comprises bidirectional trigger diode DB2, thyristor D1, resistance R8, electric capacity C2, resistance R3 and triode Q2, the first end of bidirectional trigger diode DB2 is the input of half-bridge suppression unit 103, second end of bidirectional trigger diode DB2 is connected with the first end of resistance R8 and the first end of resistance R3 simultaneously, the gate pole of the second termination thyristor D1 of resistance R8, the anode of thyristor D1 is connected with the first end of the bidirectional trigger diode DB1 in fluorescent lamp self-excited half-bridge circuit 200, the negative electrode of thyristor D1 input with fluorescent lamp circuit direct current simultaneously negative terminal Vbus-with hold and be connected, between the anode that electric capacity C2 is connected to thyristor D1 and ground, the base stage of triode Q2 is connected with resistance R3 second end, the output of the current collection of triode Q2 very half-bridge suppression unit 103, connect second end of the bidirectional trigger diode DB1 in fluorescent lamp self-excited half-bridge circuit 200, the grounded emitter of triode Q2.
The embodiment of the present invention also provides a kind of fluorescent lamp, comprise fluorescent lamp self-excited half-bridge circuit 200, fluorescent lamp also comprises above-mentioned fluorescent lamp open loop protection circuit 100, fluorescent lamp also comprises fluorescent lamp lamp body L, electric capacity C3, electric capacity C5 and electric capacity C6, second end of magnetizing inductance device T2 in the 1 termination fluorescent lamp self-excited half-bridge circuit 200 of fluorescent lamp lamp body L, electric capacity C3 is connected between the 2nd end of fluorescent lamp lamp body L and the 4th end, the first end of the 3 termination capacitor C6 of fluorescent lamp lamp body L, electric capacity C5 is connected between fluorescent lamp circuit direct current input anode Vbus+ and the first end of electric capacity C6, the second termination fluorescent lamp circuit direct current input negative terminal Vbus-of electric capacity C6.
The operation principle of fluorescent lamp open loop protection circuit is:
When fluorescent lamp open circuit or unstressed configuration lamp lamp body L access, the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit 200 exports samples rectification through rectifier diode D5, filter capacitor C4 filtering, after the partial pressure unit 102 consisted of resistance R9 and resistance R12 carries out voltage division processing, voltage because of DC signal is greater than the breakover voltage of bidirectional trigger diode DB2, then bidirectional trigger diode DB2 conducting.And the conducting of bidirectional trigger diode DB2 can make trigger current smoothly by resistance R8 and resistance R3, enter the gate pole of thyristor D1 and the collector electrode of triode Q2 respectively, and trigger thyristor D1 and triode Q2 conducting simultaneously.Fluorescent lamp direct-flow electricity inputs anode Vbus+ by resistance R1 for thyristor D1 provides conducting to maintain electric current, and the conducting of thyristor D1 can make electric capacity C2 short circuit and its both end voltage is zero, then the collector and emitter of triode Q2 is all in low-potential state, ensures the normally of triode Q2.Along with the conducting of triode Q2, the emitter voltage of triode Q3 increases and is greater than its base voltage, so triode Q3 enters cut-off state, thus makes fluorescent lamp self-excited half-bridge circuit 200 failure of oscillation, then fluorescent lamp self-excited half-bridge circuit 200 output Non voltage output.
One embodiment of the invention also provides a kind of fluorescent lamp comprising above-mentioned fluorescent lamp open loop protection circuit.
In embodiments of the present invention, by rectification filtering unit, sampling is carried out and rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit exports, for half-bridge suppression unit provides the triggering signal of telecommunication after carrying out dividing potential drop by partial pressure unit to the high voltage direct current signal of telecommunication again, operating state is entered after half-bridge suppression unit is triggered, Fluorophotometry lamp self-excited half-bridge circuit working, make its failure of oscillation, when reaching fluorescent lamp open circuit or the access of unstressed configuration lamp lamp body, fluorescent lamp self-excited half-bridge circuit output end Non voltage output, eliminates the object of high pressure Danger Electric shock risk.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a fluorescent lamp open loop protection circuit, is connected with fluorescent lamp self-excited half-bridge circuit, it is characterized in that, described fluorescent lamp open loop protection circuit comprises:
Input is connected with the output of fluorescent lamp self-excited half-bridge circuit, carries out sampling and the rectification filtering unit of rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit exports;
Input is connected with the output of described rectification filtering unit, the high voltage direct current signal of telecommunication exported is carried out to the partial pressure unit of voltage division processing from described rectification filtering unit;
Input is connected with the output of described partial pressure unit, and output is connected with the input of described fluorescent lamp self-excited half-bridge circuit, to the half-bridge suppression unit that fluorescent lamp self-excited half-bridge circuit suppresses;
Described half-bridge suppression unit comprises bidirectional trigger diode DB2, thyristor D1, resistance R8, electric capacity C2, resistance R3 and triode Q2, the first end of described bidirectional trigger diode DB2 is the input of described half-bridge suppression unit, second end of described bidirectional trigger diode DB2 is connected with the first end of described resistance R8 and the first end of described resistance R3 simultaneously, the gate pole of thyristor D1 described in second termination of described resistance R8, the anode of described thyristor D1 is connected with the first end of the bidirectional trigger diode DB1 in fluorescent lamp self-excited half-bridge circuit, the negative electrode of described thyristor D1 input with fluorescent lamp circuit direct current simultaneously negative terminal Vbus-with hold and be connected, between the anode that described electric capacity C2 is connected to described thyristor D1 and ground, the base stage of described triode Q2 is connected with described resistance R3 second end, the output of the very described half-bridge suppression unit of current collection of described triode Q2, connect second end of the bidirectional trigger diode DB1 in described fluorescent lamp self-excited half-bridge circuit, the grounded emitter of described triode Q2.
2. fluorescent lamp open loop protection circuit as claimed in claim 1; it is characterized in that; described rectification filtering unit comprises rectifier diode D5 and filter capacitor C4; the anode of described rectifier diode D5 is the input of described rectification filtering unit; the negative electrode of described rectifier diode D5 is the output of described rectification filtering unit, between the negative electrode that described filter capacitor C4 is connected to described rectifier diode D5 and ground.
3. fluorescent lamp open loop protection circuit as claimed in claim 1; it is characterized in that; described partial pressure unit comprises resistance R9 and resistance R12; the first end of described resistance R9 is the input of described partial pressure unit; second end of described resistance R9 is the output of described partial pressure unit, between the second end that described resistance R12 is connected to described resistance R9 and ground.
4. a fluorescent lamp, comprise fluorescent lamp self-excited half-bridge circuit, it is characterized in that, described fluorescent lamp also comprises fluorescent lamp open loop protection circuit, and described fluorescent lamp open loop protection circuit comprises:
Input is connected with the output of fluorescent lamp self-excited half-bridge circuit, carries out sampling and the rectification filtering unit of rectifying and wave-filtering to the high voltage direct current signal of telecommunication that fluorescent lamp self-excited half-bridge circuit exports;
Input is connected with the output of described rectification filtering unit, the high voltage direct current signal of telecommunication exported is carried out to the partial pressure unit of voltage division processing from described rectification filtering unit;
Input is connected with the output of described partial pressure unit, and output is connected with the input of described fluorescent lamp self-excited half-bridge circuit, to the half-bridge suppression unit that fluorescent lamp self-excited half-bridge circuit suppresses;
Described half-bridge suppression unit comprises bidirectional trigger diode DB2, thyristor D1, resistance R8, electric capacity C2, resistance R3 and triode Q2, the first end of described bidirectional trigger diode DB2 is the input of described half-bridge suppression unit, second end of described bidirectional trigger diode DB2 is connected with the first end of described resistance R8 and the first end of described resistance R3 simultaneously, the gate pole of thyristor D1 described in second termination of described resistance R8, the anode of described thyristor D1 is connected with the first end of the bidirectional trigger diode DB1 in fluorescent lamp self-excited half-bridge circuit, the negative electrode of described thyristor D1 input with fluorescent lamp circuit direct current simultaneously negative terminal Vbus-with hold and be connected, between the anode that described electric capacity C2 is connected to described thyristor D1 and ground, the base stage of described triode Q2 is connected with described resistance R3 second end, the output of the very described half-bridge suppression unit of current collection of described triode Q2, connect second end of the bidirectional trigger diode DB1 in described fluorescent lamp self-excited half-bridge circuit, the grounded emitter of described triode Q2,
Described fluorescent lamp self-excited half-bridge circuit comprises resistance R1, diode D2, bidirectional trigger diode DB1, triode Q1, triode Q3, diode D3, diode D4, resistance R2, resistance R4, resistance R5, resistance R6, resistance R7, resistance R10, transformer T1, electric capacity C1 and magnetizing inductance device T2, the first termination fluorescent lamp circuit direct current input anode of described resistance R1, second end of described resistance R1 is connected with the anode of diode D2 and the first end of bidirectional trigger diode DB1 simultaneously, second end of the negative electrode connecting resistance R4 of described diode D2, second end of described bidirectional trigger diode DB1 is the input of fluorescent lamp self-excited half-bridge circuit, be connected with the base stage of triode Q3, the collector electrode of described triode Q1 connects fluorescent lamp circuit direct current input anode, the emitter of described triode Q1 is connected with the first end of resistance R4, the base stage of described triode Q1 is connected with the first end of resistance R2 and the first end of resistance R5 simultaneously, the first end of second termination transformer T1 first armature winding of described resistance R2, the negative electrode of the second terminating diode D3 of described resistance R5, the anode of described diode D3 is connected with second end of second end of resistance R4 with first armature winding of transformer T1 simultaneously, second end of the collector electrode connecting resistance R4 of described triode Q3, the first end of the emitter connecting resistance R10 of described triode Q3, the second end ground connection of described resistance R10, the base stage of described triode Q3 is connected with the first end of resistance R6 and the first end of resistance R7 simultaneously, the negative electrode of the second terminating diode D4 of described resistance R6, the first end of second armature winding of the second termination transformer T1 of described resistance R7, second end of second armature winding of described transformer T1 and the anode of diode D4 ground connection simultaneously, the first end of the first termination capacitor C1 of the secondary winding of described transformer T1, the first end of the second termination magnetizing inductance device T2 of described electric capacity C1, second end of described magnetizing inductance device T2 is the output of fluorescent lamp self-excited half-bridge circuit,
Fluorescent lamp also comprises fluorescent lamp lamp body L, electric capacity C3, electric capacity C5 and electric capacity C6, second end of magnetizing inductance device T2 in the 1 termination fluorescent lamp self-excited half-bridge circuit of fluorescent lamp lamp body L, electric capacity C3 is connected between the 2nd end of fluorescent lamp lamp body L and the 4th end, the first end of the 3 termination capacitor C6 of fluorescent lamp lamp body L, electric capacity C5 is connected between fluorescent lamp circuit direct current input anode Vbus+ and the first end of electric capacity C6, the second termination fluorescent lamp circuit direct current input negative terminal Vbus-of electric capacity C6.
5. fluorescent lamp as claimed in claim 4, it is characterized in that, described rectification filtering unit comprises rectifier diode D5 and filter capacitor C4, the anode of described rectifier diode D5 is the input of described rectification filtering unit, the negative electrode of described rectifier diode D5 is the output of described rectification filtering unit, between the negative electrode that described filter capacitor C4 is connected to described rectifier diode D5 and ground.
6. fluorescent lamp as claimed in claim 4, it is characterized in that, described partial pressure unit comprises resistance R9 and resistance R12, the first end of described resistance R9 is the input of described partial pressure unit, second end of described resistance R9 is the output of described partial pressure unit, between the second end that described resistance R12 is connected to described resistance R9 and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110111224.6A CN102762020B (en) | 2011-04-29 | 2011-04-29 | Fluorescent lamp and open circuit protecting circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110111224.6A CN102762020B (en) | 2011-04-29 | 2011-04-29 | Fluorescent lamp and open circuit protecting circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102762020A CN102762020A (en) | 2012-10-31 |
| CN102762020B true CN102762020B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110111224.6A Expired - Fee Related CN102762020B (en) | 2011-04-29 | 2011-04-29 | Fluorescent lamp and open circuit protecting circuit thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2156608Y (en) * | 1993-06-05 | 1994-02-16 | 高军良 | Overvoltage protector |
| CN2879590Y (en) * | 2006-01-09 | 2007-03-14 | 史杰 | Series-wound electronic ballasts |
| CN101247695A (en) * | 2008-03-03 | 2008-08-20 | 大连交通大学 | Filament open-circuit protector for constant-current light modulation system of air station navigation light |
| CN201156840Y (en) * | 2008-02-25 | 2008-11-26 | 杨素芬 | High power electronic ballast of ultraviolet ray strip lamp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1770581A (en) * | 2005-10-11 | 2006-05-10 | 横店得邦电子有限公司 | One-way integrated protection circuit |
| CN101287323B (en) * | 2007-04-13 | 2012-01-25 | 苏州市昆士莱照明科技有限公司 | Auto-excitation type electronic ballast with over-temperature protection function |
-
2011
- 2011-04-29 CN CN201110111224.6A patent/CN102762020B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2156608Y (en) * | 1993-06-05 | 1994-02-16 | 高军良 | Overvoltage protector |
| CN2879590Y (en) * | 2006-01-09 | 2007-03-14 | 史杰 | Series-wound electronic ballasts |
| CN201156840Y (en) * | 2008-02-25 | 2008-11-26 | 杨素芬 | High power electronic ballast of ultraviolet ray strip lamp |
| CN101247695A (en) * | 2008-03-03 | 2008-08-20 | 大连交通大学 | Filament open-circuit protector for constant-current light modulation system of air station navigation light |
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| Publication number | Publication date |
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| CN102762020A (en) | 2012-10-31 |
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Granted publication date: 20150325 Termination date: 20190429 |