CN103313493A - Electronic ballast with adjustable luminance - Google Patents
Electronic ballast with adjustable luminance Download PDFInfo
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- CN103313493A CN103313493A CN2012100710834A CN201210071083A CN103313493A CN 103313493 A CN103313493 A CN 103313493A CN 2012100710834 A CN2012100710834 A CN 2012100710834A CN 201210071083 A CN201210071083 A CN 201210071083A CN 103313493 A CN103313493 A CN 103313493A
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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, a modulator tube build-up of luminance current foldback circuit, and a quick discharge circuit of a timing capacitor in the 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 be used for producing different series of electronic products with different purposes.
Description
Affiliated technical field:
The invention belongs to the lighting electronic technical field, further relate to " a kind of brightness adjustable electronic ballast ".
Background technology:
In existing technology: the electric ballast of fluorescent lamp, electricity-saving lamp and the desk-top fluorescence that in market sale and consumer, generally uses at present, 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 subject to especially consumers in general's welcome; But: this electric ballast is not owing to there being brightness control function, the brightness of its " fluorescent tube, power saving fluorescent lamps and desk-top fluorescent tube " that is lit (annotating: be designated hereinafter simply as " fluorescent tube ") can not be changed according to user's requirement, and this is very large 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 not being the lamp lighting-up current-limiting function, only be below 1/3～1/5 of normal service 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 that is lit 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 now the electric ballast of light modulation and lamp lighting-up current-limiting function, 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 adjustable electronic ballast for fluoresent lamp of 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, overcurrent or short-circuit protection function, brightness adjustable function have been increased, lamp lighting-up current-limiting function, without the quick discharge function of the timing capacitor in fluorescent tube or an end tube filament open circuit protecting function and the lamp lighting-up current-limiting circuit; Although increased many electronic components, what actual cost increased is not a lot, this electric ballast is become have brightness can be in harmonious proportion the electric ballast of new generation that multi-protective function is integrated; Use can full power starting of fluorescent tube that this electric ballast lights, high-high brightness relatively obviously increases, and relatively prolonged more than 3～5 times the useful life that is lit fluorescent tube, 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 the several functions circuit, comprising: bridge loop start circuits for triggering on the quick discharging circuit of the timing capacitor in overcurrent or short-circuit protection circuit, pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit, the 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 that the numeral in the block diagram is the job order of this functional circuit behind plugged shown in the line and arrow between block diagram in the accompanying drawing 1.
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: formed by resistor R6～R9, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and transistor BG3; The end of described resistor R6 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 R6 is connected with the end of resistor R7; The other end of described resistor R7 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 R8; The other end of described resistor R8 is connected with the positive pole of LED 1, the negative pole of light-emitting diode is connected with the end of resistor R9 and the base stage of transistor BG3, and the other end of resistor R9 is connected with the emitter of transistor BG3 and the negative electricity Node B of current rectifying and wave filtering circuit; The collector electrode of described transistor BG3 is connected with the base circuit node E of bridge-type inverter circuit transistor BG2; Electrolytic capacitor C5 rises anti-interference and postpones the trigger action of bidirectional triode thyristor TR1.
Bridge loop start circuits for triggering on the described inverter: comprise that resistor R4～R5, diode D7, capacitor C2 and diac DR1 form: the end of described resistor R4 is connected with an end of fluorescent tube DG1 one end filament and the end of capacitor C4, the other end of resistor R4 is connected with the positive pole of diode D7, the end of capacitor C2 and the end of diac DR1, and the other end of diac DR1 is connected with the base circuit node C of bridge-type inverter circuit transistor BG1; The other end of described capacitor C2 is connected with bridge-type inverter circuit node D with the end of resistor R5, and the other end of resistor R5 is connected with the anode of the bidirectional triode thyristor TR1 of overcurrent or short-circuit protection circuit.
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; 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 armature 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 armature 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, the other end of capacitor C4 is connected with the other end of the end filament of fluorescent tube DG1, an end of the end filament of fluorescent tube BG1 and the positive pole of electrolytic capacitor C10, the negative pole of diode D7, transistor BG1 collector electrode, the negative pole of diode D8 is connected with the other end of resistor R6.
Capacitor C in the described prior art circuits schematic diagram (seeing shown in the accompanying drawing 2) is replaced (seeing shown in the accompanying drawing 3) by diode D8.
Described pulse width regulating circuit: formed by triode BG4～BG5, resistor R10～R12 and capacitor C6～C7; The end of described resistor R10 is connected with the base circuit node E of the transistor BG2 of bridge-type inverter circuit with the emitter of triode BG4, the other end of resistor R10 is connected with the base stage of triode BG4, the end of resistor R11 and the end of capacitor C6, and the other end of resistor R11 is connected with the other end of capacitor C6 and the collector electrode of triode BG5; One end of the base stage of described triode BG5 and capacitor C 7 and the end of the resistor R12 node F that is connected, the head end connected node G of the secondary winding d of the other end of the emitter of triode BG5 and capacitor C7, the other end of resistor R12 and pulse transformer T1.
Described brightness regulating circuit: formed by resistor R13～R14, capacitor C8 and variohm RV1; The end of described resistor R13 is connected with current rectifying and wave filtering circuit connected node B with the bridge-type inverter circuit, the other end of resistor R13 is connected with rheostat 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 R14, and the other end of resistor R14 is connected with the base circuit node F of the transistor BG5 of pulse width modulation circuit; 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 R15; The tail end of the head end of the positive pole of described electrolytic capacitor C9 and the secondary winding c of pulse transformer T1, the secondary winding d of pulse transformer T1 is connected with current rectifying and wave filtering circuit connected node B, the negative pole of electrolytic capacitor C9 is connected with the positive pole of diode D9, the negative pole of diode D9 be connected with the end of resistor R15, the resistor R15 other end is connected with the base circuit node F of pulse width modulation circuit transistor BG5.
The quick discharging circuit of the timing capacitor in the described lamp lighting-up current-limiting circuit: formed by transistor BG6, diode D10, resistor R16～R17, electrolytic capacitor C10 and capacitor C11; The negative pole of timing capacitor electrolytic capacitor C9 in the collector electrode of described transistor BG6 and the lamp lighting-up current-limiting circuit and the positive pole of diode D7 are connected, and the emitter of transistor BG6 is connected with current rectifying and wave filtering circuit negative electricity Node B with the bridge-type inverter circuit with the negative pole of diode D10, the end of capacitor C11, the end of resistor R17; The base stage of described transistor BG6 is connected with the other end of resistor R17, the other end of capacitor C11 and the end of resistor R16, the other end of resistor R16 is connected with the positive pole of diode D10 and the negative pole of electrochemical capacitor C10, and the positive pole of electrolytic capacitor C10 is connected with current rectifying and wave filtering circuit node A positive electricity by resistor R6.
Description of drawings
Accompanying drawing 1: functional 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: prior art small-power compact type energy-saving lamp circuit theory diagrams.
Accompanying drawing 5: the embodiment of the invention 2, acoustic control lamp 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 brightness adjustable electronic ballast " is comprised of the quick discharging circuit of the timing capacitor in current rectifying and wave filtering circuit, overcurrent or short-circuit protection circuit, upper bridge loop start circuits for triggering, bridge-type inverter circuit, pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit and the 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 R6～R9, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and transistor BG3; When the bridge-type inverter circuit when rated power is exported, suitably select the resistance of resistor R6, 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 simultaneously the voltage at resistor R6 two ends surpass bidirectional triode thyristor TR1 control utmost point trigger voltage; Make bidirectional triode thyristor TR1 conducting by resistor R7; At this moment the positive electricity of current rectifying and wave filtering circuit economize on electricity A can pass through bidirectional triode thyristor TR1, resistor R8, 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 transistor BG2, the emitter of transistor BG3 is connected with the emitter of transistor BG2, make the E point voltage approximate 0 volt, make transistor BG2 cut-off, the bridge-type inverter circuit quits work, thereby effectively prevents 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; The electric energy of the electrolytic capacitor C1 storage when deenergization in the current rectifying and wave filtering circuit bleeds off rapidly to emitter through bidirectional triode thyristor TR1, resistor R8, LED 1, resistor R9 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 immediate recovery are to cut-off state; After guaranteeing that fault is got rid of, overcurrent or short-circuit protection circuit can not affect the normal operation of the circuit such as bridge-type inverter circuit during plugged again.
Pulse width regulating circuit: formed by triode BG4～BG5, resistor R10～R12 and capacitor C6～C7; When the triode BG2 of bridge-type inverter circuit conducting was positive half cycle, the tail end of the secondary winding c of pulse transformer T1 was output as positive electricity, and the head end of the secondary winding d of pulse transformer T1 is output as negative electricity; Because the secondary winding c head end of pulse transformer T1 is connected with secondary winding d tail end, has obtained relatively high pulse voltage with respect to inverter circuit node E and pulse width modulation circuit node G, circuit node E is positive electricity, circuit node G is negative electricity, and Node B also is positive electricity with respect to node G; When supposing that at this moment triode BG5 base voltage and emitter equal 0 volt, triode BG5 cut-off; Because triode BG5 off-resistances device R11 does not have electric current to pass through, make base stage and the emitter voltage of triode BG4 also equal 0 volt, so triode BG4 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 positive voltage of Node B is through resistance R 13, variable resistor RV1 and the resistor R14 base circuit capacitor C7 charging to triode BG5 simultaneously, growth along with the time, the voltage at capacitor C7 two ends can raise gradually, when voltage is elevated to 0.6 volt of left and right sides, triode BG5 conducting; The negative current of node G is added on the base stage of triode BG4 by resistor R11 after the triode BG5 conducting, because triode BG4 is the positive-negative-positive triode, belong to the forward base current and conducting, voltage after the triode BG4 conducting between its emitter and the collector electrode approximates 0 volt, make namely that voltage approximates 0 volt between the base stage of triode BG2 and the emitter, triode BG2 is ended in advance; Suitably the charging current of control capacitor C7 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 cut-off is 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, rapidly discharge capacitor C7 this moment repeats to bring into play described effect during in order to next positive half cycle; Described capacitor C6 plays the pulse current acceleration.
Brightness regulating circuit: formed by resistor R13～R14, capacitor C8 and rheostat RV1; Change the resistance size of rheostat RV1, just can change the charging current of the capacitor C7 in the pulse width regulating circuit, export the width of pulse by the triode BG2 in triode BG5 and the triode BG4 control bridge-type inverter circuit simultaneously, 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 R14 plays the effect of restriction minimum brightness, and resistor R13 and capacitor C8 form integrating circuit, are to prevent intednsity circuit at the low-light level initial period, produce the brilliance control hopping sense, play level and smooth brightness regulation effect.
Lamp lighting-up current-limiting circuit: formed by timing capacitor electrolytic capacitor C9, diode D9 and resistor R15; The voltage at electrolytic capacitor C9 two ends approximates 0 volt before the bridge-type inverter circuit start; Behind the bridge-type inverter circuit start, during triode BG2 conducting, the headend node G of the secondary winding d of pulse transformer T1 is output as negative voltage, the nodes at ends B of the secondary winding d of pulse transformer T1 is output as positive voltage, the positive voltage of Node B will pass through electrolytic capacitor C9, diode D9, resistor R15, base stage with triode BG5, emitter and capacitor C7 are to node F, give simultaneously electrolytic capacitor C9 and capacitor C7 charging, because electrolytic capacitor C9 capacity value is relatively large, resistor R15 resistance value less, so the charging current of electrolytic capacitor C9 is larger, again because the capacity value less of capacitor C7, so the charging rate of capacitor C7 is very fast, reach at once about 0.6 volt of the conducting voltage of triode BG5 base stage, make triode BG5 and triode BG4 conducting, simultaneously triode BG2 cut-off; The firm conducting of triode BG2 just cut-off makes the power output of bridge-type inverter circuit very little, the bridge-type inverter circuit is also very little to the driving power of fluorescent tube DG1, 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 BG5 and triode BG4 ON time are postponed gradually backward, and triode BG2 ON time increases gradually simultaneously; The power output of bridge-type inverter circuit is increased gradually, and the driving power of fluorescent tube DG1 also increases gradually; When the voltage at electrolytic capacitor C9 two ends equals the maximum output voltage at pulse transformer T1 secondary winding d two ends, electrolytic capacitor C9 can not produce charging current again, whole build-up of luminance current limliting process finishes, and the at this moment brightness of fluorescent tube DG1 is determined by the resistance of the variable resistance RV1 of brightness regulating circuit; 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.
The quick discharging circuit of the timing capacitor in the described lamp lighting-up current-limiting circuit: formed by transistor BG6, diode D10, resistor R16～R17, electrolytic capacitor C10 and capacitor C11; When the power supply of turning on light rigidly connects when logical, the node A positive voltage of current rectifying and wave filtering circuit is through the negative electricity of resistance R 6, electrolytic capacitor C10, diode D9 and current rectifying and wave filtering circuit Node B, C10 charges rapidly to electrolytic capacitor, and the voltage at electrolytic capacitor C10 two ends approximates the output node A of current rectifying and wave filtering circuit and the voltage between the Node B all the time in this ballast normal work period; Rectification circuit is not having electric energy output when turning off the light deenergization, the electric energy at the electrolytic capacitor C1 two ends of filter circuit, the bridge-type inverter circuit that can be gone back working on exhausts rapidly, the voltage at electrolytic capacitor C1 two ends descends close to 0 volt rapidly, the voltage at electrolytic capacitor C10 two ends also can pass through bridge-type inverter circuit discharging, the approach of discharge simultaneously; The positive current of the positive pole of electrolytic capacitor C10 is by transistor BG1, transistor BG2, the emitter of transistor BG6, the base stage of transistor BG6 and the negative discharge of resistor R16, electrolytic capacitor C10; Transistor BG6 is PNP transistor, owing to making the emitter of transistor BG6 and base stage produce enough forward currents in the time of electrolytic capacitor C10 discharge, make the rapid conducting of transistor BG6, make the voltage repid discharge at the timing capacitor C9 two ends in the lamp lighting-up current-limiting circuit approximate 0 volt; Even turn on light immediately after guaranteeing to turn off the light, the lamp lighting-up current-limiting circuit still can work, and can not exerted an influence the useful life of the filament of fluorescent tube; Capacitor C11 plays the anti-tampering effect of high frequency bypass, and resistor R16 plays the effect of restriction electrolytic capacitor C10 maximum discharge current.
Bridge loop start circuits for triggering on the described inverter: comprise that resistor R4～R5, 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 arrives the negative electricity Node B of bridge rectifier filter circuit through filament, resistor R4, capacitor C2, resistor R5, resistor R8, LED 1, the resistor R9 of the end of resistor R6, fluorescent tube GD1, give capacitor C2 charging; Suitably select resistance and the ratio of resistor R4 and R5, make it to make the voltage of the node D in the bridge-type inverter circuit low as much as possible charging is simultaneously to capacitor C2, be conducive to like this bridge-type inverter circuit start; When capacitor C2 two ends fill voltage during greater than the puncture voltage of diac DR1, immediately conducting of diac DR1, capacitor C2 fill positive electricity through diac DR1 to the base stage of transistor BG1, 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 when also not reaching the puncture voltage of diac DR1, will be bled off by transistor BG1 through diode D7, circuits for triggering can not produced the normal operation of bridge-type inverter circuit disturb; During when the glower end open circuit of the fluorescent tube DG1 that is connected with resistor R4 or without fluorescent tube; perhaps during the bidirectional triode thyristor TR1 conducting in overcurrent or the short-circuit protection circuit; can not charge to capacitor C2, thereby prolong the useful life of diac DR1 and reduced unnecessary electric energy loss.
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 upper bridge triode BG1 of bridge-type inverter circuit and use, and also can be connected to simultaneously the base loop of upper bridge circuit triode BG1 of bridge-type inverter circuit and the base loop of lower bridge circuit triode BG2 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 triode BG5 is bipolar transistor, and also available controllable silicon ((SCR)/thyristor) replaces.
Described brightness regulation variable resistance RV1, available tap switch with replace from 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.
The timing capacitor quick discharging circuit of described pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit, overcurrent or short-circuit protection circuit and lamp lighting-up current-limiting circuit can be discrete component circuit, also can be thick film circuit or integrated circuit.
The available discrete component of described a kind of brightness adjustable electronic 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 brightness adjustable function, lamp lighting-up current-limiting function and multi-protective 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 the requirement of different purposes and performance, can produce the electronic product of different purposes and different series.
Embodiment 2: the compact type energy-saving lamp electronic ballast that is applicable to acoustic control lamp; 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 the quick discharging circuit of the timing capacitor in described pulse width modulation circuit, lamp lighting-up current-limiting circuit and the lamp lighting-up current-limiting circuit, operation principle and front 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 serious infringement 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 relatively to be prolonged more than 3～5 times by the useful life of its fluorescent tube of lighting; Again owing to having increased the quick discharging circuit of the timing capacitor in the lamp lighting-up current-limiting circuit, so be particularly suitable for using in the acoustic control lamp illumination; Because compact type energy-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 without fluorescent tube or fluorescent tube one end filament open circuit protecting function.
Claims (8)
1. brightness adjustable electronic ballast: on a kind of basis of the electric ballast based on the bridge-type inverter circuit structure, increased the several functions circuit, comprising: the quick discharging circuit of the timing capacitor on overcurrent or short-circuit protection circuit, the inverter in bridge loop start circuits for triggering, pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit and the lamp lighting-up current-limiting circuit; 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: formed by resistor R6～R9, electrolytic capacitor C5, bidirectional triode thyristor TR1, LED 1 and transistor BG3; The end of described resistor R6 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 R6 is connected with the end of resistor R7; The other end of described resistor R7 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 R8; The other end of described resistor R8 is connected with the positive pole of LED 1, the negative pole of light-emitting diode is connected with the end of resistor R9 and the base stage of transistor BG3, and the other end of resistor R9 is connected with the emitter of transistor BG3 and the negative electricity Node B of current rectifying and wave filtering circuit; The collector electrode of described transistor BG3 is connected with the base circuit node E of bridge-type inverter circuit transistor BG2; Electrolytic capacitor C5 rises anti-interference and postpones the trigger action of bidirectional triode thyristor TR1.
Bridge loop start circuits for triggering on the described inverter: comprise that resistor R4～R5, diode D7, capacitor C2 and diac DR1 form: the end of described resistor R4 is connected with an end of fluorescent tube DG1 one end filament and the end of capacitor C4, the other end of resistor R4 is connected with the positive pole of diode D7, the end of capacitor C2 and the end of diac DR1, and the other end of diac DR1 is connected with the base circuit node C of bridge-type inverter circuit transistor BG1; The other end of described capacitor C2 is connected with bridge-type inverter circuit node D with the end of resistor R5, and the other end of resistor R5 is connected with the anode of the bidirectional triode thyristor TR1 of overcurrent or short-circuit protection circuit.
Described pulse width regulating circuit: formed by triode BG4～BG5, resistor R10～R12 and capacitor C6～C7; The end of described resistor R10 is connected with the base circuit node E of the transistor BG2 of bridge-type inverter circuit with the emitter of triode BG4, the other end of resistor R10 is connected with the base stage of triode BG4, the end of resistor R11 and the end of capacitor C6, and the other end of resistor R11 is connected with the other end of capacitor C6 and the collector electrode of triode BG5; One end of the base stage of described triode BG5 and capacitor C 7 and the end of the resistor R12 node F that is connected, the head end connected node G of the secondary winding d of the other end of the emitter of triode BG5 and capacitor C7, the other end of resistor R12 and pulse transformer T1.
Described brightness regulating circuit: formed by resistor R13～R14, capacitor C8 and variohm RV1; The end of described resistor R13 is connected with current rectifying and wave filtering circuit connected node B with the bridge-type inverter circuit, the other end of resistor R13 is connected with rheostat 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 R14, and the other end of resistor R14 is connected with the base circuit node F of the transistor BG5 of pulse width modulation circuit; 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 R15; The tail end of the head end of the positive pole of described electrolytic capacitor C9 and the secondary winding c of pulse transformer T1, the secondary winding d of pulse transformer T1 is connected with current rectifying and wave filtering circuit connected node B, the negative pole of electrolytic capacitor C9 is connected with the positive pole of diode D9, the negative pole of diode D9 be connected with the end of resistor R15, the resistor R15 other end is connected with the base circuit node F of pulse width modulation circuit transistor BG5.
The quick discharging circuit of the timing capacitor in the described lamp lighting-up current-limiting circuit: formed by transistor BG6, diode D10, resistor R16～R17, electrolytic capacitor C10 and capacitor C11; The negative pole of timing capacitor electrolytic capacitor C9 in the collector electrode of described transistor BG6 and the lamp lighting-up current-limiting circuit and the positive pole of diode D7 are connected, and the emitter of transistor BG6 is connected with current rectifying and wave filtering circuit negative electricity Node B with the bridge-type inverter circuit with the negative pole of diode D10, the end of capacitor C11, the end of resistor R17; The base stage of described transistor BG6 is connected with the other end of resistor R17, the other end of capacitor C11 and the end of resistor R16, the other end of resistor R16 is connected with the positive pole of diode D10 and the negative pole of electrochemical capacitor C10, and the positive pole of electrolytic capacitor C10 is connected with current rectifying and wave filtering circuit node A positive electricity by resistor R6.
2. according to the described a kind of brightness adjustable electronic 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 brightness adjustable electronic 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 brightness adjustable electronic 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 brightness adjustable electronic ballast of claim 1, it is characterized in that; Described triode BG5 is bipolar transistor, and also available miniwatt silicon controlled rectifier (SCR)/thyristor replaces.
6. according to the described a kind of brightness adjustable electronic ballast of claim 1, it is characterized in that; Described brightness regulation variable resistance RV1, available tap switch with replace from 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 brightness adjustable electronic ballast of claim 1, it is characterized in that; The quick discharging circuit of the timing capacitor on described overcurrent or short-circuit protection circuit, the inverter in bridge loop start triggering electricity, road pulse width regulating circuit, brightness regulating circuit, lamp lighting-up current-limiting circuit and the lamp lighting-up current-limiting circuit can be discrete component circuit, thick film circuit or integrated circuit.
8. according to the described a kind of brightness adjustable electronic ballast of claim 1, it is characterized in that; According to the requirement of different purposes and performance, described various functional circuits are carried out suitable deleting, can produce the electronic product of different purposes and different series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100710834A CN103313493A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100710834A CN103313493A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
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| CN103313493A true CN103313493A (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100710834A Pending CN103313493A (en) | 2012-03-07 | 2012-03-07 | Electronic ballast with adjustable luminance |
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Cited By (2)
| 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 |
| CN105979687A (en) * | 2016-07-08 | 2016-09-28 | 张玉清 | Fluorescent lamp electronic ballast |
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| CN2240226Y (en) * | 1995-02-18 | 1996-11-13 | 严波 | Electronic dimming ballast for fluorescent lamp |
| US5583395A (en) * | 1994-10-11 | 1996-12-10 | Lu; Chao-Cheng | Fluorescent device having a fluorescent starter which precisely controls heating time and absolute synchronism of fire point |
| CN101521978A (en) * | 2008-02-29 | 2009-09-02 | 皇家飞利浦电子股份有限公司 | Adjustable-light output circuit and electronic ballast used for a lamp |
| CN101868106A (en) * | 2009-04-14 | 2010-10-20 | 张玉清 | Electronic ballast for fluorescent lamp and energy-saving lamp |
| CN202949618U (en) * | 2012-03-07 | 2013-05-22 | 张玉清 | Electronic ballast with adjustable brightness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583395A (en) * | 1994-10-11 | 1996-12-10 | Lu; Chao-Cheng | Fluorescent device having a fluorescent starter which precisely controls heating time and absolute synchronism of fire point |
| CN2240226Y (en) * | 1995-02-18 | 1996-11-13 | 严波 | Electronic dimming ballast for fluorescent lamp |
| CN101521978A (en) * | 2008-02-29 | 2009-09-02 | 皇家飞利浦电子股份有限公司 | Adjustable-light output circuit and electronic ballast used for a lamp |
| CN101868106A (en) * | 2009-04-14 | 2010-10-20 | 张玉清 | Electronic ballast for fluorescent lamp and energy-saving lamp |
| CN202949618U (en) * | 2012-03-07 | 2013-05-22 | 张玉清 | Electronic ballast with adjustable brightness |
Cited By (2)
| 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 |
| CN105979687A (en) * | 2016-07-08 | 2016-09-28 | 张玉清 | Fluorescent lamp electronic ballast |
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Application publication date: 20130918 |