CN1838852B - Protection method and circuit of electronic amperite - Google Patents
Protection method and circuit of electronic amperite Download PDFInfo
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- CN1838852B CN1838852B CN2005100425888A CN200510042588A CN1838852B CN 1838852 B CN1838852 B CN 1838852B CN 2005100425888 A CN2005100425888 A CN 2005100425888A CN 200510042588 A CN200510042588 A CN 200510042588A CN 1838852 B CN1838852 B CN 1838852B
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Abstract
The invention discloses a method for protecting electric ballast and relative circuit, which comprises: a sampling step: generating a positive voltage signal to attain a positive voltage signal higher than the vibration driving circuit cathode at the first control end; generating a passive voltage signal to attain a passive voltage signal lower than vibration driving circuit cathode at the secondcontrol end; when in abnormal condition, the voltage difference between the first and second control ends is increased significantly, the threshold circuit is open; when the threshold circuit is open, the switch tube base electrode voltage of vibration driving circuit equals the voltage of second control end to close the switch tube. The invention has the advantages that: the voltage difference between the first and second control ends can be used to trigger the threshold circuit.
Description
Technical field
The present invention relates to the guard method and the circuit of electric ballast.
Background technology
Chinese patent database discloses the innovation and creation that name is called the electronic ballast for fluoresent lamp with abnormal condition protection in calendar year 2001 December 5, and its notification number is 2464039, and the patent No. is 01217047.Electronic ballast for fluoresent lamp with abnormal condition protection; comprise that common-mode noise suppresses circuit, current rectifying and wave filtering circuit, DC/AC inverter circuit and output matching network circuit, has added an abnormality automatic protection circuit between output matching network circuit and DC/AC inverter circuit.The abnormality automatic protection circuit comprises: the sample circuit that is connected in series successively, difference detecting circuit, threshold circuit and unusual control circuit.Though the switching tube of oscillation drive circuit appears can temporarily turn-offing under the abnormality in the abnormality automatic protection circuit of this technical scheme at electric ballast, but it also has following shortcoming: one, when abnormal conditions occur, the voltage signal of sample circuit sampling, the switching tube of control oscillation drive circuit turn-offs, and it is unreliable to protect; They are two years old, owing to adopt the switching tube of amplifier tube control oscillation drive circuit to turn-off, so needing provides cut-off signals for amplifier tube always, could make the switching tube of oscillation drive circuit be in off state always, promptly, under the situation that abnormality is not got rid of, this electric ballast also will be reworked, and this has danger; Its three, disconnected action can appear judging by accident, startup may be considered as abnormal conditions and automatically shut down the switching tube of oscillation drive circuit as the abnormality automatic protection circuit; Its four, adopt amplifier tube, cost height.
Summary of the invention
The purpose of this invention is to provide a kind of guard method and circuit of electric ballast, it has solved the existing in prior technology technical problem, and protection is reliable, have only power cutoff after, whole electric ballast could recover operate as normal.
Method of the present invention adopts following technical scheme: the abnormal protection method of electric ballast: comprising:
Sampling step: sampling step comprises: produce the positive voltage signal step: be used for sampling at fluorescent tube one end, and the voltage signal that this sampling obtains carried out unidirectional rectifying and wave-filtering, make to obtain a positive voltage signal that is higher than the oscillation drive circuit negative pole at first control end; Produce the negative voltage signal step: be used for sampling, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, make to obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole at second control end at main circuit;
Controlled step: when abnormal conditions occurred, the voltage difference between first control end and second control end sharply increased, and made the threshold circuit conducting;
Close step: when the threshold circuit conducting, make the switching tube base voltage of oscillation drive circuit equal the second control end voltage, close the switching tube of oscillation drive circuit.
Described generation negative voltage signal step comprises:
Magnet ring coupling step: be coupled by secondary winding and magnet ring between the elementary winding that is connected to the fluorescent tube main circuit, obtain voltage signal;
Unidirectional rectifying and wave-filtering step: voltage signal is carried out unidirectional rectifying and wave-filtering, make second control end obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole.
Described controlled step comprises:
Voltage-stabiliser tube conducting step: when abnormal conditions occurred, the voltage difference between first control end and second control end was higher than voltage of voltage regulation, made the voltage-stabiliser tube conducting;
Controllable silicon conducting step: the voltage-stabiliser tube conducting makes silicon controlled control have electric current, controllable silicon conducting.
Also comprise:
Prevent that switching tube from triggering step again: the startup electric capacity of oscillation drive circuit discharges by the loop of the threshold circuit formation of conducting, prevents because of starting the switching tube that the capacitance voltage rising triggers oscillation drive circuit once more;
Step is kept in the controllable silicon conducting: start capacitor discharge and keep electric current for the controllable silicon conducting provides conducting.
Circuit of the present invention adopts following technical scheme: the protective circuit of electric ballast comprises:
Produce the positive voltage signal circuit: it is sampled at fluorescent tube one end, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, makes to obtain a positive voltage signal that is higher than the oscillation drive circuit negative pole at first control end;
Produce the negative voltage signal circuit: it is sampled at main circuit, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, makes to obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole at second control end;
Threshold circuit, its positive pole is connected to the base stage of the switching tube of oscillation drive circuit, and negative pole is connected to second control end, and the control utmost point is connected to first control end;
When abnormal conditions occurred, the voltage difference between first control end and second control end sharply increased, thereby triggered the threshold circuit conducting, made the switching tube base voltage of oscillation drive circuit equal the second control end voltage, closed the switching tube of oscillation drive circuit.
Described generation negative voltage signal circuit comprises:
The magnet ring coupling circuit, its elementary winding is connected to main circuit, and secondary winding is connected to the oscillation drive circuit negative pole;
The second unidirectional current rectifying and wave filtering circuit: it obtains voltage signal to secondary winding and carries out unidirectional rectifying and wave-filtering, makes second control end obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole.
Described threshold circuit comprises:
Voltage-stabiliser tube, it is connected to first control end, and when abnormal conditions occurred, the voltage difference between first control end and second control end was higher than voltage of voltage regulation, made the voltage-stabiliser tube conducting;
Controllable silicon, its positive pole is connected to the switching tube base stage of oscillation drive circuit by a diode, and negative pole is connected to second control end, and the control utmost point is connected to voltage-stabiliser tube.
Also comprise:
Prevent switching tube circuits for triggering again: be used to make the startup electric capacity of oscillation drive circuit to discharge by the loop of the threshold circuit formation of conducting, prevent to trigger the switching tube of oscillation drive circuit once more, and the startup capacitor discharge for providing conducting, the controllable silicon conducting is kept electric current because of the startup capacitance voltage rises.
Described prevent switching tube again circuits for triggering comprise discharge resistance, keep current resistor, discharge resistance is connected between the startup electric capacity and silicon controlled positive pole of oscillation drive circuit, keep between the positive pole that current resistor is connected to silicon controlled positive pole and oscillation drive circuit, start electric capacity by discharge resistance, controllable silicon, keep the current resistor discharge, keep current resistor and keep electric current for controllable silicon provides conducting.
By above-mentioned description to structure of the present invention as can be known, compare with background technology, the present invention has following advantage:
One triggers the threshold circuit conducting by the voltage difference between first control end and second control end, and protection is reliable;
Its two, the threshold circuit conducting makes the switching tube base voltage of oscillation drive circuit equal the second control end voltage, promptly less than the oscillation drive circuit cathode voltage, can guarantee that the switching tube of oscillation drive circuit turn-offs, protection is reliable;
Its three, by at fluorescent tube one end and main circuit up-sampling, when occurring when unusual, the magnitude of voltage of first control end sharply increases, the voltage of second control end sharply descends, the voltage difference between first control end and second control end sharply increases, protection is reliable;
Its four, by magnet ring coupling sampled voltage signal, sampling is reliable;
Its five, adopt controllable silicon and voltage-stabiliser tube, as long as have electric current can trigger the controllable silicon conducting in the silicon controlled control extremely, keep conducting that the controllable silicon conducting only needs one and keep electric current and get final product, protection is reliable, the disconnected action can not occur judging by accident, cost is low;
They are six years old, the startup electric capacity of oscillation drive circuit discharges by the loop of the threshold circuit formation of conducting, prevent because of starting the switching tube that the capacitance voltage rising triggers oscillation drive circuit once more, start capacitor discharge simultaneously and keep electric current for the controllable silicon conducting provides conducting, so only behind power cutoff, whole electric ballast could recover operate as normal.
Description of drawings
Accompanying drawing 1 is the schematic diagram of the protective circuit of electric ballast of the present invention;
Accompanying drawing 2 is the physical circuit figure of the protective circuit of electric ballast of the present invention;
Accompanying drawing 3 is the schematic diagram of electric ballast;
Accompanying drawing 4 is the physical circuit figure of electric ballast;
Accompanying drawing 5 is the physical circuit figure of the current rectifying and wave filtering circuit of electric ballast;
Accompanying drawing 6 is the physical circuit figure of the APFC of electric ballast;
Accompanying drawing 7 is the physical circuit figure of the oscillation drive circuit of electric ballast;
Accompanying drawing 8 is the physical circuit figure of the loading oscillation circuit of electric ballast.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Circuit of the present invention adopts following technical scheme: the protective circuit of electric ballast as shown in Figure 1, 2, comprising:
Produce positive voltage signal circuit 61: its end I place at fluorescent tube 7 samples, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, makes to obtain a positive voltage signal that is higher than oscillation drive circuit 3 negative poles at the first control end I;
Produce negative voltage signal circuit 62: its F place at main circuit (also can be an end I place of fluorescent tube 7) samples, and the voltage signal that this sampling obtains carried out unidirectional rectifying and wave-filtering, make to obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole at the second control end II;
Threshold circuit 63, it comprises voltage-stabiliser tube ZD2, resistance R 24, diode D9 and controllable silicon SCR, the controllable silicon SCR control utmost point is connected to voltage-stabiliser tube ZD2 by resistance R 24, anodally is connected to the base stage of the 4th switching tube Q4 of oscillation drive circuit 3 by a diode D9, and negative pole is connected to the second control end II; Voltage-stabiliser tube ZD2 is connected to the first control end I; When abnormal conditions occur, voltage difference between the first control end I and the second control end II is higher than the voltage of voltage regulation of voltage-stabiliser tube ZD2, makes voltage-stabiliser tube ZD2 conducting, and voltage-stabiliser tube ZD2 conducting makes the control of controllable silicon SCR have electric current, the controllable silicon SCR conducting promptly triggers threshold circuit 63 conductings; The controllable silicon SCR conducting makes the 4th switching tube Q4 base voltage of oscillation drive circuit 3 equal the voltage of the second control end II, promptly less than oscillation drive circuit 3 cathode voltages, closes the 4th switching tube Q4 of oscillation drive circuit 3;
Prevent switching tube circuits for triggering 64 again, be used to make the startup capacitor C 6 of oscillation drive circuit 3 to discharge by the loop of threshold circuit 63 formations of conducting, prevent to trigger the 4th switching tube Q4 of oscillation drive circuit 3 once more, and 6 discharges of startup capacitor C also for providing conducting, the controllable silicon SCR conducting are kept electric current because of startup electric capacity 63 voltages rise.
Produce positive voltage signal circuit 61 and comprise the sample circuit and the first unidirectional current rectifying and wave filtering circuit.Sample circuit comprises resistance R 19, resistance R 20, resistance R 21, resistance R 22.The first unidirectional current rectifying and wave filtering circuit comprises a capacitor C 10, a resistance R 23 and a diode D11.The first unidirectional current rectifying and wave filtering circuit carries out unidirectional rectifying and wave-filtering to the voltage signal that this sampling obtains, and makes to obtain a positive voltage signal that is higher than oscillation drive circuit 3 negative poles at the first control end I.
Produce negative voltage signal circuit 62 and comprise the magnet ring coupling circuit and the second unidirectional current rectifying and wave filtering circuit.The magnet ring coupling circuit comprises elementary winding T1A, secondary winding T1B.Elementary winding T1A is connected between the F place and K place of main circuit, and secondary winding is connected to the negative pole of oscillation drive circuit 3.The second unidirectional current rectifying and wave filtering circuit comprises a capacitor C 9 and a diode D10, and diode D10 is connected to secondary winding T1B, and capacitor C 9 is connected between the negative pole and diode D10 of oscillation drive circuit 3.Diode D10 carries out unidirectional rectification to the voltage signal that secondary winding T1B produces.The second unidirectional current rectifying and wave filtering circuit obtains voltage signal to secondary winding T1B and carries out unidirectional rectifying and wave-filtering, makes the second control end II obtain a negative voltage signal that is lower than oscillation drive circuit 3 negative poles.
Prevent switching tube again circuits for triggering 64 comprise discharge resistance R13, keep current resistor R25, discharge resistance R13 is connected between the positive pole of the startup capacitor C 6 of oscillation drive circuit 3 and controllable silicon SCR, keep between the positive pole that current resistor R25 is connected to the positive pole of controllable silicon SCR and oscillation drive circuit 3, start capacitor C 6 by discharge resistance R13, controllable silicon SCR, keep current resistor R25 discharge, keep current resistor R25 and keep electric current for controllable silicon SCR provides conducting.
In conjunction with above-mentioned circuit, the abnormal protection method of electric ballast is described.
The abnormal protection method of electric ballast comprises:
Sampling step: sampling step comprises: produce the positive voltage signal step: be used for sampling at fluorescent tube 7 one ends, and the voltage signal that this sampling obtains carried out unidirectional rectifying and wave-filtering, make to obtain a positive voltage signal that is higher than oscillation drive circuit 3 negative poles at the first control end I; Produce the negative voltage signal step: be used for sampling, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, make to obtain a negative voltage signal that is lower than oscillation drive circuit 3 negative poles at the second control end II at main circuit;
Controlled step: controlled step comprises: voltage-stabiliser tube ZD2 conducting step: when abnormal conditions occurred, the voltage difference between the first control end I and the second control end II was higher than the voltage of voltage regulation of voltage-stabiliser tube ZD2, made voltage-stabiliser tube ZD2 conducting; Controllable silicon conducting step: voltage-stabiliser tube ZD2 conducting makes the control of controllable silicon SCR have electric current, controllable silicon SCR conducting, i.e. threshold circuit 63 conductings;
Close step: when threshold circuit 63 conductings, make the 4th switching tube Q4 base voltage of oscillation drive circuit 3 equal the second control end II voltage, close the 4th switching tube Q4 of oscillation drive circuit 3;
Prevent that switching tube from triggering step again: the startup capacitor C 6 of oscillation drive circuit 3 is discharged by the loop of threshold circuit 63 formations of conducting, prevents because of starting the 4th switching tube Q4 that the rising of capacitor C 6 voltages triggers oscillation drive circuit 3 once more;
Step is kept in the controllable silicon conducting: start capacitor C 6 discharges and keep electric current for the controllable silicon SCR conducting provides conducting.
Producing the negative voltage signal step comprises:
Magnet ring coupling step: be coupled with magnet ring between the elementary winding T1A that is connected to fluorescent tube 7 main circuits by secondary winding T1B, obtain voltage signal;
Unidirectional rectifying and wave-filtering step: voltage signal is carried out unidirectional rectifying and wave-filtering, make the second control end II obtain a negative voltage signal that is lower than oscillation drive circuit 3 negative poles.
Its operation principle is as follows:
The electric current that flows through elementary winding T1A along with main line (end of fluorescent tube 7) is big more, and the second control end II negative voltage that then produces negative voltage signal circuit 62 is high more; To flow through electric current big more along with main line (end of fluorescent tube 7), and the first control end I positive voltage that produces positive voltage signal circuit 61 is high more.When line work occurs when unusual, the second control end II negative voltage is high more, and the first control end I positive voltage is high more, and this increases the voltage difference of winning between the control end I and the second control end II, and surpass the voltage of voltage regulation of the voltage-stabiliser tube ZD2 of threshold circuit 63, and make voltage-stabiliser tube ZD2 conducting; Voltage-stabiliser tube ZD2 conducting then has the control utmost point of current trigger controllable silicon SCR, makes the controllable silicon SCR conducting.Because the negative pole of controllable silicon SCR is connected to the second control end II, the anodal base stage that is connected to the 4th switching tube Q4 of oscillation drive circuit 3 by diode D9, so when the controllable silicon SCR conducting, the voltage of the base stage of the 4th switching tube Q4 equals the voltage of the second control end II, promptly be lower than the negative pole of oscillation drive circuit 3, this makes the 4th switching tube Q4 of oscillation drive circuit 3 turn-off.
After the controllable silicon SCR conducting, the startup capacitor C 6 of oscillation drive circuit 3 by discharge resistance R13, keep current resistor R20 discharge, this can prevent to rise and trigger the 4th switching tube Q4 of oscillation drive circuit 3 once more because of starting capacitor C 6 voltages.Start the discharge of capacitor C 6 simultaneously, making to keep has had the conducting that provides conducting to keep to controllable silicon SCR to keep electric current on the current resistor R25, and this makes controllable silicon SCR be in conducting state always.So have only by behind the power cutoff, controllable silicon SCR is turn-offed; Have only removal line fault, switch again, electronic ballast circuit could recover operate as normal again.
The present invention is further illustrated and application below in conjunction with an electric ballast.
A kind of electric ballast shown in Fig. 3,4, comprises current rectifying and wave filtering circuit 1, APFC 2, oscillation drive circuit 3, loading oscillation circuit 4, second sample circuit 5 and protective circuit 6.Current rectifying and wave filtering circuit 1 external power supply; APFC 2 inputs are electrically connected current rectifying and wave filtering circuit 1 output; Oscillation drive circuit 3 inputs are electrically connected APFC 2 outputs; Loading oscillation circuit 4 inputs are electrically connected oscillation drive circuit 3 outputs; Fluorescent tube 7 connects loading oscillation circuit 4 outputs; Second sample circuit 5 is taked the signal of telecommunication in loading oscillation circuit 4.
APFC 2 is made up of discrete device, and first switching tube of the signal of telecommunication control APFC 2 by second sample circuit 5 is connected, so that current rectifying and wave filtering circuit 1 in all band afterflow, improves power factor.
Current rectifying and wave filtering circuit 1 shown in Fig. 4,5, comprises fuse FUSE, inductance L 1, capacitor C 1, inductance L 2, diode D1, diode D2, diode D3, diode D4, resistance R AV and plug IN.Diode D1, diode D2, diode D3 and diode D4 form a single phase bridge type rectifier circu.Current rectifying and wave filtering circuit 1 has output terminals A and B.Current rectifying and wave filtering circuit 1 is not further described at this for the circuit of existing current techique.
APFC 2 shown in Fig. 4,6, comprises switching circuit, driving signal control circuit, discharge circuit.APFC 2 is connected to the output terminals A and the B of current rectifying and wave filtering circuit 1.APFC 2 has output C and D.
Switching circuit comprises capacitor C 2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and the first switching tube Q1.Capacitor C 2 is connected between the output terminals A and B of current rectifying and wave filtering circuit 1.First end that 2 series connection of resistance R 1 and resistance R, one of resistance R 1 are terminated at capacitor C 2 is the output terminals A of current rectifying and wave filtering circuit 1 both.First of resistance R 3 is terminated at the emitter of the first switching tube Q1, and second is terminated at negative pole (negative pole of output end of current rectifying and wave filtering circuit 1), promptly meets the output B of current rectifying and wave filtering circuit 1.First of resistance R 4 is terminated at the base stage of the first switching tube Q1; Second of resistance R 4 is terminated at end points 5 places of secondary winding T2C.First of resistance R 5 is terminated at the base stage of the first switching tube Q1, and the negative pole of output end of the second termination current rectifying and wave filtering circuit 1 promptly meets the output B of current rectifying and wave filtering circuit 1.
Driving signal control circuit comprises second switch pipe Q2, diode D7, voltage-stabiliser tube ZD1, capacitor C 3, resistance R 6, resistance R 7, resistance R 8, resistance R 9.The positive pole of diode D7 is connected to the base stage of the first switching tube Q1, and negative pole is connected to the collector electrode of second switch pipe Q2.The emitter of second switch pipe Q2 meets the output B of current rectifying and wave filtering circuit 1.The base stage of second switch pipe Q2 is connected to the positive pole of voltage-stabiliser tube ZD1; The negative pole of voltage-stabiliser tube ZD1 connects first end of capacitor C 3.Resistance R 6, resistance R 7, resistance R 8, resistance R 9 are connected in series successively, the output B of a termination current rectifying and wave filtering circuit 1 of resistance R 9.Capacitor C 3 and resistance R 9 and downlink connection, the output B of the second termination current rectifying and wave filtering circuit 1 of capacitor C 3.Capacitor C 3, resistance R 6, resistance R 7, resistance R 8, resistance R 9 are formed the output voltage feedback circuit, when the output voltage of discharge circuit changes, capacitor C 3 changes by the discharge frequency of voltage-stabiliser tube ZD1, the switching frequency of control second switch pipe Q2, to control the operating state of the first switching tube Q1, make output voltage relatively stable.
Discharge circuit comprises inductance L 3, diode D6, capacitor C 4, diode D5.First end of the first termination capacitor C2 of inductance L 3, the both output terminals A of current rectifying and wave filtering circuit 1; Second of inductance L 3 is terminated at the collector electrode of the first switching tube Q1.The positive pole of diode D3 is connected to second end of inductance L 3, and negative pole is connected to first end of capacitor C 4.The output B of the second termination current rectifying and wave filtering circuit 1 of capacitor C 4.The positive pole of diode D6 is connected to first end of inductance L 3, and the negative pole of diode D6 is connected between the negative pole of diode D5.First end that just is terminated at capacitor C 2 of diode D6, negative pole is connected to the negative pole of diode D5.
The resistance R 2 of switching circuit is connected to first end of capacitor C 3.
One of the resistance R 6 of driving signal control circuit is terminated at the negative pole of diode D5.
Control the first switching tube Q1 by the signal of telecommunication of second sample circuit 5 and connect, at this moment, diode D3 ends, and capacitor C 4 is the level circuit discharging backward; Simultaneously to capacitor C 3 chargings.
When the output voltage of discharge circuit changed, capacitor C 3 changed by the discharge frequency of voltage-stabiliser tube ZD1, and the switching frequency of control second switch pipe Q2 to control the operating state of the first switching tube Q1, makes output voltage relatively stable.Its principle is: when the output voltage of current rectifying and wave filtering circuit 1 uprises, then C3 is full of time decreased, then the triggering and conducting frequency of Q2 is accelerated, and then divides electric frequency to accelerate to the base stage of Q1, make the triggering and conducting frequency of Q1 accelerate, lower the output voltage of APFC 2; When the output voltage of active power factor correcting circuit 2 uprises, then C3 is full of time decreased, then the triggering and conducting frequency of Q2 is accelerated, and then divides electric frequency to accelerate to the base stage of Q1, make the triggering and conducting frequency of Q1 accelerate, lower the output voltage of APFC 2.
After capacitor C 3 was full of, by voltage-stabiliser tube ZD1, control second switch pipe Q2 connected.Second switch pipe Q2 connects, the base stage of the first switching tube Q1 pass through diode D7, equal to connect the output B of current rectifying and wave filtering circuit 1, the first switching tube Q1 ends.
When the first switching tube Q1 of switching circuit by the time, inductance L 3 energy storage through diode D5 to capacitor C 4 chargings and level circuit discharging backward.
By the first switching tube Q1, second switch pipe Q2 and diode D5 alternate conduction, make current rectifying and wave filtering circuit 2 in all band afterflow, improve power factor.
Protective circuit 6 shown in Fig. 2,4, comprises generation positive voltage signal circuit 61, produces negative voltage signal circuit 62, threshold circuit 63, prevents switching tube circuits for triggering 64 again.
Produce positive voltage signal circuit 61 and comprise the sample circuit and the first unidirectional current rectifying and wave filtering circuit.Sample circuit comprises resistance R 19, resistance R 20, resistance R 21, the resistance R 22 of series connection successively.One of resistance R 19 is terminated at the output I of loading oscillation circuit 4, both first end of fluorescent tube 7.Resistance R 22 is connected to oscillation drive circuit 3 negative poles.The first unidirectional current rectifying and wave filtering circuit comprises a capacitor C 10, a resistance R 23 and a diode D11.The positive pole of diode D11 is connected to the place that connects of resistance R 21 and resistance R 22, and negative pole is connected to an end of resistance R 23, and the other end of resistance R 23 is connected to oscillation drive circuit 3 negative poles.Capacitor C 10 is connected in resistance R 23.
Produce negative voltage signal circuit 62 and comprise the magnet ring coupling circuit and the second unidirectional current rectifying and wave filtering circuit.The magnet ring coupling circuit comprises elementary winding T1A, secondary winding T1B.Elementary winding T1A is connected between the output F place and K place of oscillation drive circuit 3, and first of secondary winding is terminated at the negative pole of oscillation drive circuit 3, i.e. the output D of APFC 2.The second unidirectional current rectifying and wave filtering circuit comprises a capacitor C 9 and a diode D10, and the negative pole of diode D10 is connected to second end of secondary winding T1B, and capacitor C 9 is connected between the positive pole of the negative pole of oscillation drive circuit 3 and diode D10.Diode D10 carries out unidirectional rectification to the voltage signal that secondary winding T1B produces.Produce negative voltage signal circuit 62 and have output K.
Threshold circuit 63, it comprises voltage-stabiliser tube ZD2, resistance R 24, diode D9 and controllable silicon SCR.The negative terminal of voltage-stabiliser tube ZD2 is connected to the anode of capacitor C 10.The end that just is terminated at resistance R 24 of voltage-stabiliser tube ZD2, the other end of resistance R 24 is connected to the control utmost point of controllable silicon SCR.The negative electrode of controllable silicon SCR is connected to the positive pole of diode D10; The positive pole of controllable silicon SCR is connected to the negative pole of diode D9, and the positive pole of diode D9 is connected to the output L of oscillation drive circuit 3.
Prevent switching tube again circuits for triggering 64 comprise discharge resistance R13, keep current resistor R25.Start the output D that one of capacitor C 6 is terminated at APFC 2, the other end, promptly output G is connected to the end of discharge resistance R13, and the other end of discharge resistance R13 is connected to the positive pole of controllable silicon SCR.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process with this, i.e. the equivalence of doing according to the present patent application claim and description changes and modification, all should still belong in the scope that patent of the present invention contains.
Claims (9)
1. the abnormal protection method of electric ballast: it is characterized in that: it comprises:
Sampling step: sampling step comprises: produce the positive voltage signal step: be used for sampling at fluorescent tube one end, and the voltage signal that this sampling obtains carried out unidirectional rectifying and wave-filtering, make to obtain a positive voltage signal that is higher than the oscillation drive circuit negative pole at first control end; Produce the negative voltage signal step: be used for sampling, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, make to obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole at second control end at main circuit;
Controlled step: when abnormal conditions occurred, the voltage difference between first control end and second control end sharply increased, and made the threshold circuit conducting;
Close step: when the threshold circuit conducting, make the switching tube base voltage of oscillation drive circuit equal the second control end voltage, close the switching tube of oscillation drive circuit.
2. the abnormal protection method of electric ballast according to claim 1: it is characterized in that: described generation negative voltage signal step comprises:
Magnet ring coupling step: be coupled by secondary winding and magnet ring between the elementary winding that is connected to the fluorescent tube main circuit, obtain voltage signal;
Unidirectional rectifying and wave-filtering step: voltage signal is carried out unidirectional rectifying and wave-filtering, make second control end obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole.
3. the abnormal protection method of electric ballast according to claim 1 and 2: it is characterized in that: described controlled step comprises:
Voltage-stabiliser tube conducting step: when abnormal conditions occurred, the voltage difference between first control end and second control end was higher than voltage of voltage regulation, made the voltage-stabiliser tube conducting;
Controllable silicon conducting step: the voltage-stabiliser tube conducting makes silicon controlled control have electric current, controllable silicon conducting.
4. the abnormal protection method of electric ballast according to claim 3: it is characterized in that: also comprise:
Prevent that switching tube from triggering step again: the startup electric capacity of oscillation drive circuit discharges by the loop of the threshold circuit formation of conducting, prevents because of starting the switching tube that the capacitance voltage rising triggers oscillation drive circuit once more;
Step is kept in the controllable silicon conducting: start capacitor discharge and keep electric current for the controllable silicon conducting provides conducting.
5. the protective circuit of electric ballast, it is characterized in that: it comprises:
Produce the positive voltage signal circuit: it is sampled at fluorescent tube one end, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, makes to obtain a positive voltage signal that is higher than the oscillation drive circuit negative pole at first control end;
Produce the negative voltage signal circuit: it is sampled at main circuit, and the voltage signal that this sampling obtains is carried out unidirectional rectifying and wave-filtering, makes to obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole at second control end;
Threshold circuit, its positive pole is connected to the base stage of the switching tube of oscillation drive circuit, and negative pole is connected to second control end, and the control utmost point is connected to first control end;
When abnormal conditions occurred, the voltage difference between first control end and second control end sharply increased, thereby triggered the threshold circuit conducting, made the switching tube base voltage of oscillation drive circuit equal the second control end voltage, closed the switching tube of oscillation drive circuit.
6. the protective circuit of electric ballast according to claim 5, it is characterized in that: described generation negative voltage signal circuit comprises:
The magnet ring coupling circuit, its elementary winding is connected to main circuit, and secondary winding is connected to the oscillation drive circuit negative pole;
The second unidirectional current rectifying and wave filtering circuit: it obtains voltage signal to secondary winding and carries out unidirectional rectifying and wave-filtering, makes second control end obtain a negative voltage signal that is lower than the oscillation drive circuit negative pole.
7. according to the protective circuit of claim 5 or 6 described electric ballasts, it is characterized in that: described threshold circuit comprises:
Voltage-stabiliser tube, it is connected to first control end, and when abnormal conditions occurred, the voltage difference between first control end and second control end was higher than voltage of voltage regulation, made the voltage-stabiliser tube conducting;
Controllable silicon, its positive pole is connected to the switching tube base stage of oscillation drive circuit by a diode, and negative pole is connected to second control end, and the control utmost point is connected to voltage-stabiliser tube.
8. the protective circuit of electric ballast according to claim 7 is characterized in that: also comprise:
Prevent switching tube circuits for triggering again: be used to make the startup electric capacity of oscillation drive circuit to discharge by the loop of the threshold circuit formation of conducting, prevent to trigger the switching tube of oscillation drive circuit once more, and the startup capacitor discharge for providing conducting, the controllable silicon conducting is kept electric current because of the startup capacitance voltage rises.
9. the protective circuit of electric ballast according to claim 8; it is characterized in that: described prevent switching tube again circuits for triggering comprise discharge resistance, keep current resistor; discharge resistance is connected between the startup electric capacity and silicon controlled positive pole of oscillation drive circuit; keep between the positive pole that current resistor is connected to silicon controlled positive pole and oscillation drive circuit; start electric capacity by discharge resistance, controllable silicon, keep the current resistor discharge, keep current resistor and keep electric current for controllable silicon provides conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100425888A CN1838852B (en) | 2005-03-24 | 2005-03-24 | Protection method and circuit of electronic amperite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100425888A CN1838852B (en) | 2005-03-24 | 2005-03-24 | Protection method and circuit of electronic amperite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1838852A CN1838852A (en) | 2006-09-27 |
| CN1838852B true CN1838852B (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100425888A Expired - Fee Related CN1838852B (en) | 2005-03-24 | 2005-03-24 | Protection method and circuit of electronic amperite |
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| Country | Link |
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| CN (1) | CN1838852B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060748B (en) * | 2007-04-29 | 2010-12-22 | 林万炯 | Local rectifying protective circuit of fluorescent lamp electronic ballast |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065173A (en) * | 1992-03-31 | 1992-10-07 | 陕西省电力电子技术产业集团 | The protective circuit of electric ballast and cathodic pre-heating circuit |
| CN2268354Y (en) * | 1996-08-02 | 1997-11-19 | 广州南沙华睿电子信息系统开发公司 | Electronic ballast |
| CN2273480Y (en) * | 1996-10-06 | 1998-01-28 | 浙江阳光集团公司 | Electronic ballast of high strength gas discharge lamp |
| US6292339B1 (en) * | 1999-03-23 | 2001-09-18 | Douglas William Brooks | Output protection for arc discharge lamp ballast |
| CN2790100Y (en) * | 2005-03-24 | 2006-06-21 | 厦门通士达照明有限公司 | Protection circuit for electronic ballast |
-
2005
- 2005-03-24 CN CN2005100425888A patent/CN1838852B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065173A (en) * | 1992-03-31 | 1992-10-07 | 陕西省电力电子技术产业集团 | The protective circuit of electric ballast and cathodic pre-heating circuit |
| CN2268354Y (en) * | 1996-08-02 | 1997-11-19 | 广州南沙华睿电子信息系统开发公司 | Electronic ballast |
| CN2273480Y (en) * | 1996-10-06 | 1998-01-28 | 浙江阳光集团公司 | Electronic ballast of high strength gas discharge lamp |
| US6292339B1 (en) * | 1999-03-23 | 2001-09-18 | Douglas William Brooks | Output protection for arc discharge lamp ballast |
| CN2790100Y (en) * | 2005-03-24 | 2006-06-21 | 厦门通士达照明有限公司 | Protection circuit for electronic ballast |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1838852A (en) | 2006-09-27 |
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