CN203675414U - Protection circuit and ballast - Google Patents
Protection circuit and ballast Download PDFInfo
- Publication number
- CN203675414U CN203675414U CN201320844048.1U CN201320844048U CN203675414U CN 203675414 U CN203675414 U CN 203675414U CN 201320844048 U CN201320844048 U CN 201320844048U CN 203675414 U CN203675414 U CN 203675414U
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- ballast
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- protective circuit
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- 230000001681 protective effect Effects 0.000 description 44
- 238000004804 winding Methods 0.000 description 30
- 239000003381 stabilizer Substances 0.000 description 28
- 239000003990 capacitor Substances 0.000 description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 20
- 229910052710 silicon Inorganic materials 0.000 description 20
- 239000010703 silicon Substances 0.000 description 20
- 238000001514 detection method Methods 0.000 description 12
- 238000010891 electric arc Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000007858 starting material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model provides a protection circuit and a ballast. The protection circuit comprises a detection circuit and a control circuit, wherein the detection circuit is used for detecting whether arc discharge is generated or not between the output end of the ballast and a connected load; and the control circuit is used for controlling the ballast to stop working immediately when the detection circuit detects generation of arc discharge, and the control circuit is connected with the detection circuit. The protection circuit provided by the utility model can eliminate arc discharge immediately when detecting that arc discharge is generated between the ballast and the connected load, thereby avoiding potential safety hazards caused by arc discharge.
Description
Technical field
The utility model relates to a kind of protective circuit and ballast, relates in particular to a kind of protective circuit and ballast that prevents from producing under ballast high pressure arcing.
Background technology
Ballast (ballast resistor) is the equipment that plays metering function on fluorescent lamp and produce instantaneous pressure.It is on the iron core of manufacturing at silicon steel, to twine enamelled wire to be made, and the coil of such ribbon core, in the time that moment, ON/OFF powered on, will self-induction produce high pressure, is added on the electrode (filament) at the two ends of fluorescent tube.This action hockets, and in the time that starter (jump bubble) is closed, the filament of fluorescent tube is by ballast current limliting conducting heating; In the time that starter is opened a way, ballast will self-induction produces high pressure and is added on the two ends filament of fluorescent tube, and the phosphor powder of filament emission electronics bombardment tube wall is luminous, starter break-make several times repeatedly, will be repeatedly such action several times, thereby get through fluorescent tube.When fluorescent tube is normal when luminous, internal resistance diminishes, and starter just remains open-circuit condition, and electric current has passed through fluorescent tube, ballast work with regard to stable like this, makes fluorescent tube normally luminous.
When life-span of lamp ends or when lamp holder is loosening, fluorescent lamp can produce high-voltage arc discharge electric discharge but can not start, now ballast need to provide good protection, guarantees fail safe as far as possible.
The anti-arc discharge protective circuit of current existing high pressure mostly adopts the sampling of output series inductance, utilizes optocoupler electronic component to isolate, although can reach anti-arcing protection effect, can not eliminate immediately arcing phenomenon.
Utility model content
The purpose of this utility model is to provide a kind of protective circuit and ballast, when detecting while producing arcing between ballast and the load of connection, eliminates immediately arcing, avoids the potential safety hazard producing due to arcing.
To achieve these goals, the utility model embodiment provides a kind of protective circuit, and for ballast, described protective circuit comprises:
For detection of the testing circuit that whether produces arcing between the output of described ballast and the load being connected;
While producing arcing for detecting at described testing circuit, control described ballast out-of-work control circuit immediately, described control circuit is connected with described testing circuit.
Above-mentioned protective circuit, wherein, the output of described ballast is specially the first secondary winding of step-up transformer;
Described testing circuit specifically comprises:
For detection of the detection electronic circuit that whether produces arcing between described the first secondary winding and the described load being connected.
Above-mentioned protective circuit, wherein, described the first secondary winding comprises the first output pin and the second output pin, described detection electronic circuit specifically comprises:
Current transformer, the former limit of described current transformer is made up of opposite polarity two the second windings, after described two the second winding parallels, be connected on the path that described the first output pin is connected with described load, the secondary of described current transformer is made up of second secondary winding;
At the voltage-stabiliser tube of the secondary voltage of described current transformer conducting during higher than setting voltage, described voltage-stabiliser tube is connected with the secondary of described current transformer.
Above-mentioned protective circuit, wherein, described detection electronic circuit also comprises:
Carry out the resistance of dividing potential drop for the secondary voltage that described current transformer is produced;
For the secondary voltage after dividing potential drop is carried out to the diode of halfwave rectifier, described diode is connected with described resistance, and the secondary voltage after rectification is during higher than the setting voltage of described voltage-stabiliser tube, described voltage-stabiliser tube conducting.
Above-mentioned protective circuit, wherein, described control circuit specifically comprises:
Produce when arcing the control electronic circuit that to control by the curtage of the first windings of described step-up transformer be zero for detecting at described testing circuit.
Above-mentioned protective circuit, wherein, described protective circuit is the power supply of described step-up transformer by triode, detects while producing arcing at described testing circuit, triode quits work described in the control of described control electronic circuit.
Above-mentioned protective circuit, wherein, described control electronic circuit specifically comprises:
For negative potential being added in to the electrochemical capacitor in the base stage of described triode, the negative pole of described electrochemical capacitor is connected with the base stage of described triode;
For after described voltage-stabiliser tube conducting, control the controllable silicon in the base stage that described electrochemical capacitor is added in negative potential on described triode, the described silicon controlled control utmost point is connected with described voltage-stabiliser tube, described silicon controlled minus earth, and described silicon controlled anode is connected with the positive pole of described electrochemical capacitor.
To achieve these goals, the utility model embodiment also provides a kind of ballast, and described ballast comprises the protective circuit described in above-mentioned any one.
The utility model embodiment has at least one in following beneficial effect:
The utility model embodiment can, detecting while producing arcing between ballast and the load of connection, eliminate arcing immediately, has avoided further the potential safety hazard producing due to arcing;
The utility model embodiment utilizes faraday's theorem, by the two-way electric current of same magnetic element, and equal and opposite in direction, opposite direction, the voltage that is created in magnetic element secondary is zero, makes protective circuit control simple, has reduced the cost of protective circuit simultaneously;
The utility model embodiment has guaranteed normal use and the switch of ballast, the misoperation of prevention protective circuit, and make the work of whole circuit more reliable;
The protective circuit that the utility model embodiment provides, the circuit element quantity relating to is few, and circuit reliability significantly improves.
Accompanying drawing explanation
The circuit diagram of a kind of protective circuit that Fig. 1 provides for the utility model embodiment;
The circuit diagram of the another kind of protective circuit that Fig. 2 provides for the utility model embodiment.
Embodiment
For technical problem, technical scheme and advantage that the utility model embodiment will be solved are clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The utility model embodiment provides a kind of protective circuit, and for ballast, described protective circuit as shown in Figure 1, comprising:
For detection of the testing circuit that whether produces arcing between the output of described ballast and the load being connected;
While producing arcing for detecting at described testing circuit, control described ballast out-of-work control circuit immediately, described control circuit is connected with described testing circuit.
In the utility model embodiment, between the output that detects ballast by testing circuit and the load being connected, whether produce arcing, when testing circuit detects while producing arcing, quit work immediately by control circuit control ballast.Ballast quits work, and namely, no longer to load output high pressure, arcing phenomenon can be eliminated immediately, has also avoided further the potential safety hazard that produces due to arcing, has realized the purpose of this utility model.
Wherein, the output of described ballast is specially the first secondary winding of step-up transformer;
Described testing circuit specifically comprises:
For detection of the detection electronic circuit that whether produces arcing between described the first secondary winding and the described load being connected.
The output of ballast is the secondary winding of step-up transformer, detects electronic circuit and can detect between the secondary winding of step-up transformer and load whether produced arcing, between the first secondary winding and load, whether has produced arcing.
Above-mentioned protective circuit, wherein, described the first secondary winding comprises the first output pin and the second output pin, described detection electronic circuit specifically comprises:
Current transformer, the former limit of described current transformer is made up of opposite polarity two the second windings, after described two the second winding parallels, be connected on the path that described the first output pin is connected with described load, the secondary of described current transformer is made up of second secondary winding;
At the voltage-stabiliser tube of the secondary voltage of described current transformer conducting during higher than setting voltage, described voltage-stabiliser tube is connected with the secondary of described current transformer.
Utilize in embodiments of the present invention faraday's theorem, by the two-way electric current of same magnetic element, if equal and opposite in direction, opposite direction, the voltage that is created in magnetic element secondary is zero.The former limit of circuit instrument transformer is to be made up of two windings of parallel connection, and after two the second winding parallels, be connected on the path between the first output pin and the load of step-up transformer, whether conducting just can be confirmed whether to have produced high-voltage arc discharge by voltage-stabiliser tube to detect electronic circuit.
Can find out, when between the output of ballast and the load being connected when normal work, the current opposite in direction of two windings in the former limit of current flowing instrument transformer, and equal and opposite in direction, current transformer secondary can not produce voltage or electric current.Accordingly, voltage-stabiliser tube also just can not conducting.Detection electronic circuit is not switched on confirmation by voltage-stabiliser tube and does not produce high-voltage arc discharge.Normal use and the switch of ballast are so guaranteed.
In the time producing high-voltage arc discharge between the output of ballast and the load being connected, the size of current of two windings in the former limit of current flowing instrument transformer also can correspondingly change so, make current transformer secondary produce voltage signal, in the time that the size of voltage signal has exceeded the setting voltage of voltage-stabiliser tube, voltage-stabiliser tube conducting.Now detect electronic circuit and just can confirm to have produced high-voltage arc discharge.Wherein, the setting voltage of voltage-stabiliser tube can be made as 0 volt, and in the time that current sensor has secondary voltage to produce, voltage-stabiliser tube gets final product conducting.Certainly; in order to prevent the misoperation of protective circuit; the setting voltage of voltage-stabiliser tube can be arranged a little more than 0 volt; avoid thinking the current arcing that occurs by mistake because voltage small in current transformer or curent change make to detect electronic circuit; and control circuit control ballast is quit work, make the work of whole circuit more reliable.
The embodiment of the present invention also makes protective circuit control simple by said process, has reduced the cost of protective circuit simultaneously.
Above-mentioned protective circuit, wherein preferably, carries out dividing potential drop to the secondary voltage of current transformer by resistance, and carries out being just input to after halfwave rectifier the positive pole of voltage-stabiliser tube by diode, and described detection electronic circuit also comprises:
Carry out the resistance of dividing potential drop for the secondary voltage that described current transformer is produced;
For the secondary voltage after dividing potential drop is carried out to the diode of halfwave rectifier, described diode is connected with described resistance, and the secondary voltage after rectification is during higher than the setting voltage of described voltage-stabiliser tube, described voltage-stabiliser tube conducting.
Above-mentioned detection electronic circuit is to detect between secondary winding and the load being connected of step-up transformer whether produce arcing, accordingly, in the time producing arcing, control ballast quits work immediately, the curtage that can flow through a winding of step-up transformer by control is zero to realize, and described control circuit specifically comprises:
Produce when arcing the control electronic circuit that to control by the curtage of the first windings of described step-up transformer be zero for detecting at described testing circuit.
Above-mentioned protective circuit, wherein, described protective circuit is the power supply of described step-up transformer by triode, detects while producing arcing at described testing circuit, triode quits work described in the control of described control electronic circuit.
Wherein preferably, described control electronic circuit specifically comprises:
For negative potential being added in to the electrochemical capacitor in the base stage of described triode, the negative pole of described electrochemical capacitor is connected with the base stage of described triode;
For after described voltage-stabiliser tube conducting, control the controllable silicon in the base stage that described electrochemical capacitor is added in negative potential on described triode, the described silicon controlled control utmost point is connected with described voltage-stabiliser tube, described silicon controlled minus earth, and described silicon controlled anode is connected with the positive pole of described electrochemical capacitor.
In the time of voltage-stabiliser tube conducting, illustrate between the output that has now produced ballast and the load being connected and produced high-voltage arc discharge, the signal of voltage-stabiliser tube is input to the silicon controlled control utmost point, make conducting between silicon controlled anode and negative electrode, due to silicon controlled minus earth, silicon controlled anode is also shorted to ground.Because silicon controlled anode is connected with the positive pole of electrochemical capacitor, the load of electrochemical capacitor is connected with the base stage of triode, is now equivalent to negative potential to be directly added in the base stage of triode, and triode quits work.Step-up transformer is powered by described triode, and accordingly, a winding of step-up transformer does not just have electric current to flow through, thereby makes ballast stop work, there is no the generation of voltage or electric current.
Certainly, in control circuit, can also comprise divider resistance and rectifying and wave-filtering electric capacity that other are necessary, for the voltage signal of stabilization control circuit.
Can find out, the above-mentioned protective circuit that the utility model embodiment provides, the circuit element quantity relating to is few, and circuit reliability significantly improves.
The detailed circuit diagram of a kind of protective circuit that Fig. 2 provides for the utility model embodiment, further illustrates the utility model below in conjunction with Fig. 2.
In this protective circuit, testing circuit specifically comprises:
Current transformer T401, resistance R 401, diode D401 and voltage-stabiliser tube D403;
In this protective circuit, control circuit specifically comprises:
Controllable silicon SCR 401, electrochemical capacitor C403.
The concrete connection of this protective circuit is as follows:
The first secondary winding of step-up transformer T201, be connected to 1 pin of the second winding N1 (1 pin-6 pin) of T401 current transformer by the first output pin (13 pin), 6 pin of N1 are connected to output current limiting capacitor C 203, and the other end of capacitor C 203 is connected to high-voltage output end (BL1);
13 pin of step-up transformer T201 are connected to 4 pin of the second winding N2 (3 pin-4 pin) of current transformer T401 simultaneously, and 3 pin of N2 connect output current limiting capacitor C 204, and the other end of capacitor C 204 is connected to another high-voltage output end (RD1);
The second output pin (10 pin) of step-up transformer T201 is connected to the public end of load high pressure (YL1);
The second secondary winding N3 (2 pin-5 pin) of current transformer T401 is the voltage sampling end of instrument transformer, 5 pin ground connection, when sampling voltage 2 pin are timing, this sampling voltage is through resistance R 401 dividing potential drops and diode D401 halfwave rectifier, be connected to RC filter network R402 and C401, be connected to the negative terminal of voltage-stabiliser tube D403;
The dividing potential drop of the anode process resistance R 403 of voltage-stabiliser tube D401, contact resistance R404, capacitor C 402, and be finally connected with the control utmost point of controllable silicon SCR 401;
Silicon controlled minus earth, anode, through resistance R 407 current limlitings, is connected to D404 diode negative terminal;
The first of step-up transformer T201 winding Nd3 (9 pin-8 pin) provide an alternating-current voltage source for protective circuit in addition, the base stage of 9 pin connecting triode Q202 of voltage source, 8 pin are through the AC-DC conversion of diode D402, through the current limliting of resistance R 405, be connected to electrolytic capacitor filter C403 positive pole;
Resistance R 406 is connected in parallel on electrochemical capacitor C403 two ends;
Electrochemical capacitor C403 positive pole connects the anode of diode D404.
The course of work of this protective circuit is as follows:
First; the Nd3 (9 pin-8 pin) of step-up transformer T201 provides an alternating-current voltage source for protective circuit; 9 pin of voltage source connect the base stage of Q202 triode; 8 pin are through the AC-DC conversion of D402; through the current-limiting resistance of R405; be connected to electrolytic capacitor filter C403 and electrochemical capacitor is charged, for protective circuit provides a direct voltage source.
Main circuit resonant ignition circuit, 13 pin through step-up transformer T201 produce high pressure, connect N2(3 pin-4 pin of current transformer T401), the interface end of the other end (RD1) of process capacitor C 204 is connected with load fluorescent tube, another road is through N1(1 pin-6 pin of current transformer T401), the interface end of the other end (BL1) of process capacitor C 203 is connected with load fluorescent tube, the other end of two-way load fluorescent tube is public end, the YL1 link of 10 pin of process T201 is connected, and makes two-way load lamp works.
Due to the N2(3 pin of current transformer T401) with N1(1 pin) Motor Winding Same Name of Ends is anti-phase principle; and through the current signal equal and opposite in direction of N2 and N1; making N3(2 pin-5 pin on current transformer T401) voltage is 0; when load is normally worked like this; owing to not having voltage signal to produce on N3; just can guarantee that ballast, in the time of normal use and switch, effectively prevents the misoperation of protective circuit, thereby makes main circuit work more reliable.
As load end (RD1, BL1, YL1) when any one interface and load lamp tube open circuit high-voltage arc discharge, N3(2 pin-5 pin of current transformer T401) generation high level, N3(5 pin) ground connection, the other end is through R401 current limliting, D401 rectification, link the negative terminal of voltage-stabiliser tube D403, when sampling voltage is during higher than voltage-stabiliser tube magnitude of voltage, D403 conducting, through the control utmost point level signal of controllable silicon SCR 401, make controllable silicon SCR 401 negative electrodes and anode conducting, after controlled silicon conducting, directly controllable silicon anode level short is arrived to ground, make the positive potential on electrochemical capacitor C403, change in the base stage that negative potential is added in triode Q202, in the time that transistor base makes to add negative signal, triode Q202 quits work, resonant ignition circuit also quits work like this, step-up transformer T201 secondary side does not just have electric current to flow through yet, thereby reach the anti-arcing defencive function of high pressure.
The utility model embodiment can utilize faraday's theorem by the utility model embodiment, by the two-way electric current of same magnetic element, equal and opposite in direction, opposite direction, the voltage that is created in magnetic element secondary is zero, detecting while producing arcing between ballast and the load of connection, eliminate immediately arcing, avoid further the potential safety hazard producing due to arcing; Protective circuit control is simple, has reduced the cost of protective circuit simultaneously; Can also guarantee normal use and the switch of ballast, the misoperation of prevention protective circuit, and make the work of whole circuit more reliable; Because the circuit element quantity relating to is few, circuit reliability significantly improves simultaneously.
The utility model embodiment also provides a kind of ballast, and described ballast comprises the protective circuit described in above-mentioned any one.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1. a protective circuit, for ballast, is characterized in that, described protective circuit comprises:
For detection of the testing circuit that whether produces arcing between the output of described ballast and the load being connected;
While producing arcing for detecting at described testing circuit, control described ballast out-of-work control circuit immediately, described control circuit is connected with described testing circuit.
2. protective circuit as claimed in claim 1, is characterized in that, the output of described ballast is specially the first secondary winding of step-up transformer;
Described testing circuit specifically comprises:
For detection of the detection electronic circuit that whether produces arcing between described the first secondary winding and the described load being connected.
3. protective circuit as claimed in claim 2, is characterized in that, described the first secondary winding comprises the first output pin and the second output pin, and described detection electronic circuit specifically comprises:
Current transformer, the former limit of described current transformer is made up of opposite polarity two the second windings, after described two the second winding parallels, be connected on the path that described the first output pin is connected with described load, the secondary of described current transformer is made up of second secondary winding;
At the voltage-stabiliser tube of the secondary voltage of described current transformer conducting during higher than setting voltage, described voltage-stabiliser tube is connected with the secondary of described current transformer.
4. protective circuit as claimed in claim 3, is characterized in that, described detection electronic circuit also comprises:
Carry out the resistance of dividing potential drop for the secondary voltage that described current transformer is produced;
For the secondary voltage after dividing potential drop is carried out to the diode of halfwave rectifier, described diode is connected with described resistance, and the secondary voltage after rectification is during higher than the setting voltage of described voltage-stabiliser tube, described voltage-stabiliser tube conducting.
5. protective circuit as claimed in claim 4, is characterized in that, described control circuit specifically comprises:
Produce when arcing the control electronic circuit that to control by the curtage of the first windings of described step-up transformer be zero for detecting at described testing circuit.
6. protective circuit as claimed in claim 5, is characterized in that, described protective circuit is the power supply of described step-up transformer by triode, detects while producing arcing at described testing circuit, and triode quits work described in the control of described control electronic circuit.
7. protective circuit as claimed in claim 6, is characterized in that, described control electronic circuit specifically comprises:
For negative potential being added in to the electrochemical capacitor in the base stage of described triode, the negative pole of described electrochemical capacitor is connected with the base stage of described triode;
For after described voltage-stabiliser tube conducting, control the controllable silicon in the base stage that described electrochemical capacitor is added in negative potential on described triode, the described silicon controlled control utmost point is connected with described voltage-stabiliser tube, described silicon controlled minus earth, and described silicon controlled anode is connected with the positive pole of described electrochemical capacitor.
8. a ballast, is characterized in that, described ballast comprises the protective circuit described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320844048.1U CN203675414U (en) | 2013-12-19 | 2013-12-19 | Protection circuit and ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320844048.1U CN203675414U (en) | 2013-12-19 | 2013-12-19 | Protection circuit and ballast |
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| Publication Number | Publication Date |
|---|---|
| CN203675414U true CN203675414U (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320844048.1U Expired - Lifetime CN203675414U (en) | 2013-12-19 | 2013-12-19 | Protection circuit and ballast |
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| Country | Link |
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| CN (1) | CN203675414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217662A (en) * | 2018-08-27 | 2019-01-15 | 厦门阳光恩耐照明有限公司 | The framework that boosts protects circuit |
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
-
2013
- 2013-12-19 CN CN201320844048.1U patent/CN203675414U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217662A (en) * | 2018-08-27 | 2019-01-15 | 厦门阳光恩耐照明有限公司 | The framework that boosts protects circuit |
| CN109217662B (en) * | 2018-08-27 | 2024-02-09 | 厦门阳光恩耐照明有限公司 | Boost architecture protection circuit |
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
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