CN103313492A - Electronic ballast with adjustable luminance - Google Patents
Electronic ballast with adjustable luminance Download PDFInfo
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- CN103313492A CN103313492A CN2012100710603A CN201210071060A CN103313492A CN 103313492 A CN103313492 A CN 103313492A CN 2012100710603 A CN2012100710603 A CN 2012100710603A CN 201210071060 A CN201210071060 A CN 201210071060A CN 103313492 A CN103313492 A CN 103313492A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an 'electronic ballast with adjustable luminance'. On the basis of an electronic ballast based on a bridge type inverter circuit structure, multiple functional circuits are added. The functional circuits comprise an overcurrent or short-circuit protection circuit, an inverter upper bridge loop start trigger circuit, a pulse width adjustment circuit, a luminance adjustment circuit, and a modulator tube build-up of luminance current foldback circuit. Even though relatively more elements are used, and the cost is increased less, the electronic ballast is a new generation of electronic ballast integrated with adjustable luminance, preheating of a filament of a modulator tube, build-up of luminance foldback of the modulator tube and multiple protection functions. The electronic ballast with adjustable luminance has higher cost performance and stronger market competitiveness, has better social benefit and environmental benefit, can properly delete various functional circuits according to the requirements of different purposes and performances, and can produce different series of electronic products with different purposes.
Description
Affiliated technical field:
The invention belongs to the illumination electronic technology field, further relate to " a kind of adjustable brightness electric ballast ".
Background technology:
In existing technology: the electric ballast of present fluorescent lamp, electricity-saving lamp and the desk-top fluorescence that in market sale and consumer, generally uses, substantially all be the circuit structure that adopts " magnetic satisfy self-excited half-bridge formula inverter circuit " (notes: be designated hereinafter simply as " bridge-type inverter circuit "), its basic circuit schematic diagram is seen shown in the accompanying drawing 2; Because simple in structure, use that element is less, selling price is lower, is subjected to consumers in general's welcome especially; But: this electric ballast is not owing to there is brightness control function, the brightness of its " fluorescent tube, power saving fluorescent lamps and desk-top fluorescent tube " of being lighted (annotating: be designated hereinafter simply as " fluorescent tube ") can not be changed according to user's requirement, and this is very big wastes for energy-saving and emission-reduction; Especially desk-top fluorescent lamp, because its brightness can not be regulated, brightness is too high or too low to have produced serious injury to a lot of teen-age eyes; Owing to there is not the lamp lighting-up current-limiting function, only be below 1/3～1/5 of normal useful life the actual life that causes fluorescent tube again, when ambient temperature be lower than+below 10 ℃ the time, it is more obvious that shorten the useful life of fluorescent tube; So manufacturer has to the power output of ballast is reduced to below 70%～80% of rated power of being lighted fluorescent tube, electric current is to the impact of the filament of fluorescent tube when starting to reduce, come the useful life of prolonging lamp tube, the result causes and uses the brightness of the fluorescent tube that this ballast lights obviously to feel not enough; And has the electric ballast of light modulation and lamp lighting-up current-limiting function now, all be to adopt special-purpose integrated circuit and fet power pipe to form, may be owing to reasons such as technology or costs, in fact the electronic ballast for fluoresent lamp of adjustable brightness is not sold and is used in the consumer in market now.
Content of the present invention:
In order to overcome above-mentioned deficiency: the invention provides on a kind of electric ballast basis based on the bridge-type inverter circuit structure, increased overcurrent or short-circuit protection function, adjustable brightness function, lamp lighting-up current-limiting function and do not had fluorescent tube or an end tube filament open circuit protecting function; Though increased many electronic components, what actual cost increased is not a lot, this electric ballast is become have adjustable brightness and the kinds of protect function is the electric ballast of new generation of one; Use can full power starting of fluorescent tube that this electric ballast lights, high-high brightness relatively obviously increases, and prolonged more than 3～5 times the useful life of being lighted fluorescent tube relatively, really can accomplish not only to economize on electricity but also economical effect; Because the use of fluorescent lamp is still quite general at present, if can both use this electric ballast, for reducing resource consumption, environmental pollution and energy-saving and emission-reduction, will be a quite huge contribution.
Technical scheme:
Technical scheme of the present invention: provide on a kind of basis of the electric ballast based on the bridge-type inverter circuit structure, increased multiple functional circuit, comprising: bridge loop start circuits for triggering on overcurrent or short-circuit protection circuit, pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit and the inverter; It is characterized in that: formed by " transistor " (annotating: be designated hereinafter simply as " triode "), " crystal diode " (annotating: be designated hereinafter simply as " diode "), bidirectional triode thyristor (two-way thyratron transistor), resistor, variable resistance, capacitor, electrolytic capacitor, fuse, pulse transformer and inductor; Described functional circuit annexation sees shown in the line and arrow between block diagram in the accompanying drawing 1, the job order of the numeral in the block diagram after for this functional circuit connection power supply.
The concrete technical scheme of the present invention: the functional circuit block diagram sees that shown in the accompanying drawing 1, circuit theory diagrams are seen shown in the accompanying drawing 3.
Described current rectifying and wave filtering circuit: formed by fuse F1, diode D1～D4 and electrolytic capacitor C1; Described diode D1～D4 forms bridge rectifier, wherein the positive pole of diode D1 is connected with the negative pole of diode D2 and is connected with the input O of AC power, the negative pole of the positive pole of described diode D3, diode D4 is connected with the end of fuse F1, and the other end of fuse F1 is connected with another input X of AC power; The negative pole of described diode D1, D3 is output as positive electricity with the node A that electrolytic capacitor C1 positive pole is connected; The positive pole of described diode D2, D4 is output as negative electricity with the Node B that electrolytic capacitor C1 negative pole is connected.
Described overcurrent or short-circuit protection circuit: the transistor BG3 by resistor R5～R8, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and pulse width modulation circuit forms; The end of described resistor R5 is connected with the positive electrical nodes A of current rectifying and wave filtering circuit with the negative electrode of the positive pole of electrolytic capacitor C5, bidirectional triode thyristor TR1, and the other end of resistor R5 is connected with the end of resistor R6; The other end of described resistor R6 is connected with the negative pole of electrolytic capacitor C5 and the control utmost point of bidirectional triode thyristor TR1; The anode of described bidirectional triode thyristor TR1 is connected with the end of resistor R7 and the end of resistor R4; The other end of described resistor R7 is connected with the positive pole of LED 1 and the end of resistor R8, and the negative pole of LED 1 is connected with the base stage of the transistor BG3 of pulse width modulation circuit; The other end of described resistor R8 now is connected with current rectifying and wave filtering circuit negative electricity Node B.
Described bridge-type inverter circuit: formed by triode BG1～BG2, diode D5, D6, D8, capacitor C3～C4, resistor R1～R2, pulse transformer T1 and inductor L1; One end of the filament of the negative pole of the collector electrode of described triode BG1, diode D8 and fluorescent tube DG1 is connected with positive electrical nodes A in the described current rectifying and wave filtering circuit by resistor R5; The end of the negative pole of the base stage of described triode BG1 and diode D5 and resistor R1 is connected to node C; The other end of resistor R1 is connected with the head end of the secondary winding b of pulse transformer T1; The tail end of the head end of the elementary winding a of the positive pole of the positive pole of the collector electrode of the emitter of described triode BG1 and triode BG2, diode D5, diode D8, pulse transformer T1 and the secondary winding b of pulse transformer T1 is connected to node D; The negative pole of the base stage of described triode BG2 and diode D6 and resistor R2 one end are connected to node E, and the other end of resistor R2 links to each other with the tail end of the secondary winding c of pulse transformer T1; The head end of the positive pole of the emitter of described triode BG2 and diode D6, the secondary winding c of pulse transformer T1 and the negative electricity Node B of current rectifying and wave filtering circuit are connected; The tail end of the elementary winding a of described pulse transformer T1 is connected with the end of capacitor C3, the other end of capacitor C3 is connected with the end of inductor L1, the other end of inductor L1 is connected with an end of the filament of the other end of fluorescent tube DG1, the other end of the filament of the other end of fluorescent tube DG1 is connected with the end of capacitor C4, and the other end of capacitor C4 is connected with the other end of the end filament of fluorescent tube DG1.
Described pulse width regulating circuit: formed by triode BG3～BG4, resistor R9～R11 and capacitor C6～C7; The end of described resistor R9 is connected with current rectifying and wave filtering circuit negative electricity Node B with the emitter of the transistor BG2 of bridge-type inverter circuit with the emitter of triode BG3, the other end of resistor R9 is connected with the base stage of triode BG3, the end of resistor R10 and the end of capacitor C6, and the collector electrode of triode BG3 is connected with bridge-type inverter circuit triode BG2 base circuit node E; The other end of described resistor R10 is connected with the other end of capacitor C6 and the collector electrode of triode BG4, one end of the base stage of triode BG4 and capacitor C 7 and the end of the resistor R11 node F that is connected, the tail end of the secondary winding d of the other end of the emitter of triode BG4 and capacitor C7, the other end of resistor R11 and pulse transformer T1 is connected in node G.
Described brightness regulating circuit: formed by resistor R12～R13, capacitor C8 and variohm RV1; The end of described resistor R12 is connected with current rectifying and wave filtering circuit connected node B with the bridge-type inverter circuit, the other end of resistor R12 is connected with variohm RV1 feather key with the end of capacitor C8, the end of variohm RV1, the other end of variohm RV1 is connected with the end of resistor R13, the other end of resistor R13 is connected with the base circuit node F of the transistor BG4 of pulse width modulation circuit, and the other end of described capacitor C8 is connected with the emitter circuit node G of the transistor BG5 of pulse width modulation circuit.
Described lamp lighting-up current-limiting circuit: formed by timing capacitor electrolytic capacitor C9, diode D9 and resistor R14～R15; The end of the negative pole of described electrolytic capacitor C9 and resistor R15 and the head end of the secondary winding c of pulse transformer T1 be connected with current rectifying and wave filtering circuit connected node B, the positive pole of electrolytic capacitor C9 is connected with the other end of resistor R15, the negative pole of diode D9, the positive pole of diode D9 be connected with the end of resistor R14; Describedly be connected with the base circuit node F of pulse width modulation circuit transistor BG4 with the resistor R14 other end.
Bridge loop start circuits for triggering on the described inverter: comprise resistor R3～R4, diode D7, capacitor C2 forms with diac DR1: the end of described resistor R3 is connected with the other end of fluorescent tube DG1 one end filament, the positive pole of the other end of resistor R3 and diode D7, the end of capacitor C2 is connected with the end of diac DR1, the other end of diac DR1 is connected with the base circuit node C of bridge-type inverter circuit transistor BG1, and the other end of described capacitor C2 is connected with the end of resistor R4 and the node D point of bridge-type inverter circuit; The other end of described resistor R4 is connected with the anode of the bidirectional triode thyristor TR1 of overcurrent or short-circuit protection circuit and the end of resistor R7; The negative pole of described diode D7 is connected with the collector electrode of bridge-type inverter circuit transistor BG1.
Capacitor C in the described prior art circuits schematic diagram (seeing shown in the accompanying drawing 2) is now replaced (seeing shown in the accompanying drawing 3) by diode D8.
Description of drawings
Accompanying drawing 1: integrated circuit annexation of the present invention and job order block diagram.
Accompanying drawing 2: prior art circuits schematic diagram.
Accompanying drawing 3: the present invention and embodiment 1 circuit theory diagrams.
Accompanying drawing 4: a kind of small-power compact type energy-saving lamp of prior art circuit theory diagrams.
Accompanying drawing 5: the embodiment of the invention 2, a kind of small-power compact type energy-saving lamp circuit theory diagrams.
Embodiment:
Below in conjunction with drawings and Examples circuit structure of the present invention and operation principle are done simple declaration:
Shown in accompanying drawing 1 and accompanying drawing 3: the present invention's " a kind of adjustable brightness electric ballast " is made up of current rectifying and wave filtering circuit, overcurrent or short-circuit protection circuit, last bridge loop start circuits for triggering, bridge-type inverter circuit, pulse width regulating circuit, brightness regulating circuit and lamp lighting-up current-limiting circuit; Described current rectifying and wave filtering circuit, bridge-type inverter circuit are prior art, and its operation principle is not being given unnecessary details.
Now by reference to the accompanying drawings 1, accompanying drawing 3 and embodiment are described in further detail the operation principle of each circuit part of the present invention.
Described overcurrent or short-circuit protection circuit: formed by resistor R5～R8, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and pulse width modulation circuit transistor BG3; When the bridge-type inverter circuit when rated power is exported, suitably select the resistance of resistor R5, make it both end voltage and fall and be slightly less than bidirectional triode thyristor TR1 control utmost point trigger voltage; Bridge-type inverter circuit working electric current is obviously increased when lamp tube air leaking, tube filament during aging or tube circuit short circuit, make the voltage at resistor R5 two ends surpass bidirectional triode thyristor TR1 control utmost point trigger voltage simultaneously; Make bidirectional triode thyristor TR1 conducting by resistor R6, at this moment the positive electricity of current rectifying and wave filtering circuit node A can pass through bidirectional triode thyristor TR1, resistor R7, LED 1 is added on the base stage of transistor BG3, makes transistor BG3 conducting; Because the collector electrode of transistor BG3 is connected with the base circuit E point of bridge-type inverter circuit transistor BG2, the emitter of transistor BG3 is connected with the emitter of transistor BG2, make the E point voltage approximate 0 volt, transistor BG2 is ended, the bridge-type inverter circuit is quit work, thereby effectively prevent from damaging relevant electronic component because of bridge-type inverter output power of circuit overload; Meanwhile LED 1 is luminous, for maintenance personal or consumer's reference; Electrolytic capacitor C1 electric energy stored when deenergization in the current rectifying and wave filtering circuit bleeds off rapidly to emitter, current rectifying and wave filtering circuit negative electricity Node B through bidirectional triode thyristor TR1, resistor R7, LED 1, resistor R8 and transistor BG3 base stage, when electric current less than bidirectional triode thyristor TR1 keep electric current the time, bidirectional triode thyristor TR1 and transistor BG3 return to cut-off state; After guaranteeing that fault is got rid of, overcurrent or short-circuit protection circuit can not influence the operate as normal of circuit such as bridge-type inverter circuit when connecting power supply again.
Bridge loop start circuits for triggering on the described inverter: comprise that resistor R3～R4, diode D7, capacitor C2 and diac DR1 form: when power supply rigidly connects when logical, the positive voltage of the node A output of bridge rectifier filter circuit is given capacitor C2 charging through the negative electricity Node B that filament, resistor R3, capacitor C2, resistor R4, resistor R7, LED 1, the resistor R8 of the end of resistor R5, fluorescent tube GD1 arrives bridge rectifier filter circuit; Suitably select resistance and the ratio of resistor R3 and R4, making it giving capacitor C2 charging is simultaneously, makes the voltage of the node D in the bridge-type inverter circuit low as much as possible, is conducive to the bridge-type inverter circuit start like this; When capacitor C2 two ends fill voltage during greater than the puncture voltage of diac DR1, diac is conducting immediately, capacitor C2 fill positive electricity through the base stage of the transistor BG1 of diac DR1, emitter discharge, transistor BG1 conducting, the bridge-type inverter circuit commences work without delay; Because the operating frequency of bridge-type inverter circuit is much larger than the charging rate of capacitor C2, when transistor BG1 conducting, capacitor C2 fill at two ends voltage will be bled off by transistor BG1 through diode D7 when also not reaching the puncture voltage of diac DR1, start triggering circuit can not produced the operate as normal of bridge-type inverter circuit disturbs; When the glower end of the fluorescent tube DG1 that is connected with resistor R3 is opened a way or is not had fluorescent tube; perhaps during the bidirectional triode thyristor TR1 conducting in the short circuit over-current protection circuit; can not charge to capacitor C2, thereby prolong the useful life of diac DR1 and reduced unnecessary electric energy loss.
Described pulse width regulating circuit: formed by triode BG3～BG4, resistor R9～R11 and capacitor C6～C7; When the triode BG2 of bridge-type inverter circuit conducting is positive half cycle, the tail end of the secondary winding c of pulse transformer T1 is sensed as positive electricity, the head end of the secondary winding d of pulse transformer T1 is sensed as negative electricity, because the secondary winding c tail end of pulse transformer T1 is connected with secondary winding d head end, has obtained relative higher pulse voltage with respect to the inverter circuit Node B with pulse width modulation circuit node G, circuit node B is negative electricity, and circuit node G is positive electricity; When supposing that at this moment voltage between triode BG4 base stage and the emitter equals 0 volt, triode BG4 ends; Because triode BG4 off-resistances device R10 does not have electric current to pass through, make that voltage also equals 0 volt between the base stage of triode BG3 and the emitter, so triode BG3 also ends, at this moment pulse width modulation circuit has no effect for the conducting of the triode BG2 of bridge-type inverter circuit; But when at every turn in bridge-type inverter circuit triode BG2 conducting: the negative voltage of Node B is given the base circuit capacitor C7 charging of triode BG4 through resistance R 12, variable resistor RV1 and resistor R13 simultaneously, growth along with the time, the voltage at capacitor C7 two ends can descend gradually, when voltage descends 0.6 volt of left and right sides, because triode BG4 is PNP transistor, so triode BG4 conducting; The positive current of node G is added on the base stage of triode BG3 by resistor R10 after the triode BG4 conducting, because triode BG3 is NPN type triode, belong to the forward base current and conducting, voltage after the triode BG3 conducting between its emitter and the collector electrode approximates 0 volt, just make base stage and the voltage between the emitter of triode BG2 also approximate 0 volt, triode BG2 is ended in advance; Suitably the charging current of control capacitor C7 size just can be controlled the width of the output pulse of bridge-type inverter circuit transistor BG2; When the transistor BG2 of bridge-type inverter circuit ends for negative half period, whole pulse width modulation circuit is in the reverse voltage power supply of pulse transformer secondary winding c and winding d, the bridge-type inverter circuit is had no effect, this moment, capacitor C7 discharged rapidly, the identical effect of performance during in order to the positive half cycle of next transistor BG2; Described capacitor C6 plays the pulse current acceleration.
Described brightness regulating circuit: formed by resistor R12～R13, capacitor C8 and rheostat RV1; Change the resistance size of rheostat RV1, just can change the charging current size of the capacitor C7 in the pulse width regulating circuit, control the length of the triode BG2 ON time in the bridge-type inverter circuit simultaneously by triode BG4 and triode BG3, also change the size of bridge-type inverter output power of circuit, equally also changed the brightness of the load fluorescent tube DG1 of bridge-type inverter circuit; Resistor R13 plays the effect of restriction minimum brightness, and resistor R12 and capacitor C8 form integrating circuit, are to prevent intednsity circuit at the low-light level initial period, produces brilliance control jump sense, plays level and smooth brightness regulation effect.
Described lamp lighting-up current-limiting circuit: be made up of timing capacitor electrolytic capacitor C9, diode D9 and resistor R14, the voltage at capacitor C9 two ends approximates 0 volt before the bridge-type inverter circuit start; Behind the bridge-type inverter circuit start, when triode BG2 conducting, the nodes at ends G of the secondary winding d of pulse transformer T1 is output as positive voltage, the head end of the secondary winding d of pulse transformer T1 is connected with the tail end of secondary winding c, the head end of secondary winding c is connected with the current rectifying and wave filtering circuit Node B, make Node B be output as negative voltage, the positive voltage of node G will charge for simultaneously electrolytic capacitor C9 and capacitor C7 through emission-utmost point base stage of transistor BG4 and capacitor C7, resistor R14, diode D9, electrolytic capacitor C9 to circuit node B; Because electrolytic capacitor C9 capacity value is relatively large, resistor R15 resistance value is less relatively, so the charging current of electrolytic capacitor C9 is bigger, again because the capacity value of capacitor C7 is less relatively, so the charging rate of capacitor C7 is very fast, reach about 0.6 volt of the conducting voltage of triode BG4 base stage at once, make triode BG4 and triode BG3 conducting, triode BG2 is ended; The firm conducting of triode BG2 is just by making the power output of bridge-type inverter circuit very little, so the drive current to fluorescent tube DG1 is also very little, as bridge-type inverter circuit triode BG2 again during conducting, electrolytic capacitor C9 and capacitor C7 repeat above-mentioned charging process again, increase along with the recharge cycle, electrolytic capacitor C9 both end voltage raises gradually, charging current to capacitor C7 reduces gradually, triode BG4 and triode BG3 ON time are postponed backward gradually, and triode BG2 ON time increases gradually simultaneously; The power output of bridge-type inverter circuit is increased gradually, and the brightness of fluorescent tube DG1 is also gradually increase simultaneously; When the voltage at electrolytic capacitor C9 two ends equals the maximum output voltage at pulse transformer secondary winding d and two ends, secondary winding c series connection back, electrolytic capacitor C9 can not produce charging current again, whole build-up of luminance current limliting process finishes, and the brightness of fluorescent tube DG1 is at this moment determined by the resistance of the variable resistance RV1 of brightness regulating circuit; The voltage at electrolytic capacitor C9 two ends bleeds off through parallel resistor device R15 behind the deenergization of turning off the light, in order to prevent that resistor R15 from influencing the operate as normal of lamp lighting-up current-limiting circuit, the resistance value of resistor R15 is bigger, about about 10～15 seconds of whole discharge time, at this moment turn on light again between, because it is fully not cold that fluorescent tube and tube filament also do not have, it is not very big that life-span of fluorescent tube is influenced; Diode D9 prevents the anti-phase discharge process of electrolytic capacitor C9 in the circuit, and resistor R15 plays the effect of restriction maximum charging current.
Capacitor C in the described prior art circuits schematic diagram (seeing shown in the accompanying drawing 2), now replace (seeing shown in the accompanying drawing 3) with diode D8, the transistor BG1 in the bridge-type inverter circuit, the switching loss of BG2 can be obviously reduced, the operating frequency of transistor BG1, BG2 can be significantly improved.
Described pulse width modulation circuit, brightness regulating circuit and lamp lighting-up circuit also can be connected in the base loop of last bridge circuit triode BG2 of bridge-type inverter circuit and use, and also can be connected the base loop of last bridge circuit triode BG1 of bridge-type inverter circuit and the base loop of following bridge circuit triode BG2 simultaneously and use simultaneously.
Described bridge-type inverter circuit can be self-excitation, its sharp semibridge system or the various electronic products of full-bridge type inverter circuit.
The power tube of described bridge-type inverter circuit can be the product of bipolar transistor, field effect transistor triode (MOSFET) and insulated gate bipolar transistor (IGBT).
Described brightness regulation variable resistance RV1, available tap switch with replace with the fixed resistance of the corresponding different resistances of fixed resistance, a plurality of relay and a plurality of relay of the corresponding different resistances in tap switch contact and the receiving terminal transistor of photoelectrical coupler IC.
Bridge loop start circuits for triggering can be discrete component circuit on described pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit, overcurrent or short-circuit protection circuit and the inverter, also can be thick film circuit or integrated circuit.
The available discrete component of described a kind of adjustable brightness electric ballast (shown in the accompanying drawing 3) is made on one or more circuit board; Also can make thick film circuit and integrated circuit to whole circuit or local circuit, can make the volume of electric ballast of the present invention obviously reduce more reliable performance.
Specific embodiment
Embodiment 1: described accompanying drawing 3 also is embodiment side circuit schematic diagram; Press electronic component annexation and the suitable unit for electrical property parameters of selecting each electronic component of the circuit theory diagrams of accompanying drawing 3, both can produce the electric ballast that different capacity has adjustable brightness function, lamp lighting-up current-limiting function and kinds of protect function.
In actual implementation process: can carry out suitable deleting to various functional circuits described in the circuit shown in accompanying drawing 1 of the present invention, the accompanying drawing 3 according to different purposes and performance demands, can produce the electronic product of different purposes and different series.
Embodiment 2: a kind of compact type energy-saving lamp electronic ballast; Concrete circuit working schematic diagram is seen shown in the accompanying drawing 5; (seeing accompanying drawing 4) on the circuit base of prior art small-power compact type energy-saving lamp has increased described pulse width modulation circuit, lamp lighting-up current-limiting circuit, operation principle and preceding described identical repeating no more; Wherein capacitor C4 is series resonance capacitor, during startup to the pre-heat effect of tube filament, in the electric ballast of prior art, because start-up course is too fast, the pre-heat effect of tube filament that capacitor C4 is risen is very little, turn on light all at every turn and can produce severe impairment to the filament of fluorescent tube, but under the effect of the lamp lighting-up current-limiting function of this electric ballast, capacitor C4 has the tube filament preheat function of highly significant; Change the size of the capacity of capacitor C4, just can change the size of tube filament preheat curent, capacity and the length of lamp lighting-up current limliting time of suitable selection capacitor C4 just can make to be prolonged more than 3～5 times relatively by the useful life of its fluorescent tube of lighting; Because this lamp lighting-up current-limiting circuit needs 10～15 seconds recovery time, so this electricity-saving lamp is suitable for other any place except the acoustic control lamp illumination; Because the close-coupled electricity-saving lamp substantially all belongs to disposable product, in order to reduce volume, this electric ballast has been deleted overcurrent or short-circuit protection circuit and no fluorescent tube or fluorescent tube one end filament open circuit protecting function.
Claims (8)
1. adjustable brightness electric ballast: on a kind of basis of the electric ballast based on the bridge-type inverter circuit structure, increased multiple functional circuit, comprising: bridge loop start circuits for triggering, pulse width regulating circuit, brightness regulating circuit and lamp lighting-up current-limiting circuit on overcurrent or short-circuit protection circuit, the inverter; It is characterized in that: formed by transistor, crystal diode, bidirectional triode thyristor (two-way thyratron transistor), resistor, variable resistance, capacitor, electrolytic capacitor, fuse, pulse transformer and inductor
Described overcurrent or short-circuit protection circuit: the transistor BG3 by resistor R5～R8, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and pulse width modulation circuit forms; The end of described resistor R5 is connected with the positive electrical nodes A of current rectifying and wave filtering circuit with the negative electrode of the positive pole of electrolytic capacitor C5, bidirectional triode thyristor TR1, and the other end of resistor R5 is connected with the end of resistor R6; The other end of described resistor R6 is connected with the negative pole of electrolytic capacitor C5 and the control utmost point of bidirectional triode thyristor TR1; The anode of described bidirectional triode thyristor TR1 is connected with the end of resistor R7 and the end of resistor R4; The other end of described resistor R7 is connected with the positive pole of LED 1 and the end of resistor R8, and the negative pole of LED 1 is connected with the base stage of the transistor BG3 of pulse width modulation circuit; The other end of described resistor R8 now is connected with current rectifying and wave filtering circuit negative electricity Node B.
Bridge loop start circuits for triggering on the described inverter: comprise resistor R3～R4, diode D7, capacitor C2 forms with diac DR1: the end of described resistor R3 is connected with the other end of fluorescent tube DG1 one end filament, the positive pole of the other end of resistor R3 and diode D7, the end of capacitor C2 is connected with the end of diac DR1, the other end of diac DR1 is connected with the base circuit node C of bridge-type inverter circuit transistor BG1, and the other end of described capacitor C2 is connected with the end of resistor R4 and the node D point of bridge-type inverter circuit; The other end of described resistor R4 is connected with the anode of the bidirectional triode thyristor TR1 of overcurrent or short-circuit protection circuit and the end of resistor R7; The negative pole of described diode D7 is connected with the collector electrode of bridge-type inverter circuit transistor BG1.
Described pulse width regulating circuit: formed by triode BG3～BG4, resistor R9～R11 and capacitor C6～C7; The end of described resistor R9 is connected with current rectifying and wave filtering circuit negative electricity Node B with the emitter of the transistor BG2 of bridge-type inverter circuit with the emitter of triode BG3, the other end of resistor R9 is connected with the base stage of triode BG3, the end of resistor R10 and the end of capacitor C6, and the collector electrode of triode BG3 is connected with bridge-type inverter circuit triode BG2 base circuit node E; The other end of described resistor R10 is connected with the other end of capacitor C6 and the collector electrode of triode BG4, one end of the base stage of triode BG4 and capacitor C 7 and the end of the resistor R11 node F that is connected, the tail end of the secondary winding d of the other end of the emitter of triode BG4 and capacitor C7, the other end of resistor R11 and pulse transformer T1 is connected in node G.
Described brightness regulating circuit: formed by resistor R12～R13, capacitor C8 and variohm RV1; The end of described resistor R12 is connected with current rectifying and wave filtering circuit connected node B with the bridge-type inverter circuit, the other end of resistor R12 is connected with variohm RV1 feather key with the end of capacitor C8, the end of variohm RV1, the other end of variohm RV1 is connected with the end of resistor R13, the other end of resistor R13 is connected with the base circuit node F of the transistor BG4 of pulse width modulation circuit, and the other end of described capacitor C8 is connected with the emitter circuit node G of the transistor BG5 of pulse width modulation circuit.
Described lamp lighting-up current-limiting circuit: formed by timing capacitor electrolytic capacitor C9, diode D9 and resistor R14～R15; The end of the negative pole of described electrolytic capacitor C9 and resistor R15 and the head end of the secondary winding c of pulse transformer T1 be connected with current rectifying and wave filtering circuit connected node B, the positive pole of electrolytic capacitor C9 is connected with the other end of resistor R15, the negative pole of diode D9, the positive pole of diode D9 be connected with the end of resistor R14; Describedly be connected with the base circuit node F of pulse width modulation circuit transistor BG4 with the resistor R14 other end.
2. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Capacitor C in the described prior art circuits schematic diagram, D8 is replaced by diode.
3. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Described bridge-type inverter circuit can be self-excitation, its sharp semibridge system or the various electronic products of full-bridge type inverter circuit.
4. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; The power tube of described bridge-type inverter can be the product of double pole triode, fet (MOSFET) and insulated gate bipolar triode (IGBT).
5. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Described pulse width modulation circuit, brightness regulating circuit and lamp lighting-up circuit also can be connected in the base loop of last bridge circuit triode BG1 of bridge-type inverter circuit and use, and also can be connected the base loop of last bridge circuit triode BG1 of bridge-type inverter circuit and the base loop of following bridge circuit triode BG2 simultaneously and use simultaneously.
6. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Described brightness regulation variable resistance RV1, available tap switch with replace with the fixed resistance of the corresponding a plurality of different resistances of fixed resistance, a plurality of relay and a plurality of relay of the corresponding a plurality of different resistances in tap switch contact and the receiving terminal transistor of photoelectrical coupler IC.
7. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Bridge loop start circuits for triggering, pulse width regulating circuit, brightness regulating circuit and lamp lighting-up current-limiting circuit can be discrete component circuit, thick film circuit or integrated circuit on described overcurrent or short-circuit protection circuit, the inverter.
8. according to the described a kind of adjustable brightness electric ballast of claim 1, it is characterized in that; Described according to different purposes and performance demands, described various functional circuits are carried out suitable deleting, can produce the electronic product of different purposes and different series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100710603A CN103313492A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100710603A CN103313492A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
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| Publication Number | Publication Date |
|---|---|
| CN103313492A true CN103313492A (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100710603A Pending CN103313492A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754844A (en) * | 2015-03-03 | 2015-07-01 | 杭州鸿雁东贝光电科技有限公司 | Electronic ballast for fluorescent lamp |
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| CN101600288A (en) * | 2009-02-25 | 2009-12-09 | 刘军 | A kind of circuit of electronic ballast that is adapted to common dimmer for light control |
| CN201528460U (en) * | 2009-04-14 | 2010-07-14 | 张玉清 | Fluorescent lamp and electric ballast of energy-saving lamp |
| CN201860496U (en) * | 2010-09-20 | 2011-06-08 | Tcl光源科技(惠州)有限公司 | Electronic ballast with protection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050093477A1 (en) * | 2003-10-17 | 2005-05-05 | Ruhe Shi | Electronic ballast having end of lamp life, overheating, and shut down protections, and reignition and multiple striking capabilities |
| CN101600288A (en) * | 2009-02-25 | 2009-12-09 | 刘军 | A kind of circuit of electronic ballast that is adapted to common dimmer for light control |
| CN201528460U (en) * | 2009-04-14 | 2010-07-14 | 张玉清 | Fluorescent lamp and electric ballast of energy-saving lamp |
| CN201860496U (en) * | 2010-09-20 | 2011-06-08 | Tcl光源科技(惠州)有限公司 | Electronic ballast with protection function |
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Application publication date: 20130918 |