CN103857109B - A kind of constant-current voltage-stabilizing drive circuit and light fixture - Google Patents
A kind of constant-current voltage-stabilizing drive circuit and light fixture Download PDFInfo
- Publication number
- CN103857109B CN103857109B CN201210501404.XA CN201210501404A CN103857109B CN 103857109 B CN103857109 B CN 103857109B CN 201210501404 A CN201210501404 A CN 201210501404A CN 103857109 B CN103857109 B CN 103857109B
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage
- switching tube
- current
- electric capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of constant-current voltage-stabilizing drive circuit, including current rectifying and wave filtering circuit, the first resistance, the second resistance, the 3rd resistance, the first switching tube, second switch pipe, transformator, the first diode and the first electric capacity.The constant-current voltage-stabilizing drive circuit of the embodiment of the present invention is less costly, produces signal mainly by the primary coil of its internal resistance, electric capacity and transformator, secondary coil and ancillary coil, and its frequency variation, stability are strong, reliability is high, compact, and function is simple.Separately, the invention also discloses a kind of light fixture with above-mentioned constant-current voltage-stabilizing drive circuit.
Description
Technical field
The present invention relates to LED lamp and drive field, particularly relate to a kind of constant-current voltage-stabilizing drive circuit and light fixture.
Background technology
Existing Switching Power Supply and constant-current driving adopt pwm chip (PulseWidthModulation) mostly, and its switching frequency is fixed, and control the size of output voltage and electric current by adjusting pulse bandwidth.Adopt the relatively costly of pwm chip.
Summary of the invention
The technical problem to be solved is in that, it is provided that a kind of constant-current voltage-stabilizing drive circuit.Can effectively reduce cost, and simple in construction, stability is strong, reliability is high.
In order to solve above-mentioned technical problem, The embodiment provides a kind of constant-current voltage-stabilizing drive circuit, including current rectifying and wave filtering circuit, first resistance, second resistance, 3rd resistance, first switching tube, second switch pipe, transformator, first diode and the first electric capacity, described current rectifying and wave filtering circuit connects extraneous electric main, to convert external world's electric main to first DC voltage, first end of described first resistance is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first resistance is connected to the control end of described first switching tube through described second resistance, first end of described first switching tube connects the Same Name of Ends of the primary coil of described transformator, the different name end of the primary coil of described transformator is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first switching tube is connected to the control end of second switch pipe, and through described 3rd resistance eutral grounding, first end of described second switch pipe is connected to described first DC voltage by described first resistance, second end ground connection of described second switch pipe, the Same Name of Ends of the secondary coil of described transformator connects the anode of described first diode, the negative electrode of described first diode connects the anode of described first electric capacity, the negative electrode of described first electric capacity connects different name end the ground connection of the secondary coil of described transformator, the anode of described first electric capacity is as the first outfan of described constant-current voltage-stabilizing drive circuit, the negative electrode of described first electric capacity is as the second outfan of described constant-current voltage-stabilizing drive circuit, described first electric capacity is used for energy storage, when described first DC voltage powers to described first switching tube through described first resistance, described first switching tube conducting, the primary coil of described transformator is through described first switching tube and described 3rd resistance eutral grounding, the primary coil of described transformator is thus storing energy, described 3rd resistance provides the control end that dividing potential drop supplies electricity to described second switch pipe, described second switch pipe is made to turn on, reduce the control terminal voltage of described first switching tube, so that described first switching tube cut-off, the primary coil of described transformator progressively releases energy in the secondary coil of described transformator, the secondary coil of described transformator is through described first diode and described first electric capacity charging, and export stable electric current and voltage at the first outfan of described constant-current voltage-stabilizing drive circuit and the second outfan.
Wherein, described constant-current voltage-stabilizing drive circuit also includes the second electric capacity, the 4th resistance and the 5th resistance, for second DC voltage stable at described first outfan and described second outfan output, after described second electric capacity and the 4th resistant series, it is parallel to the two ends of described first diode, described second electric capacity and the 4th resistance composition RC peak absorbing circuit, described 5th resistance is connected between the different name end of the negative electrode of described first diode and the secondary coil of described transformator.
Wherein, described constant-current voltage-stabilizing drive circuit also includes the ancillary coil of described transformator, 3rd electric capacity, second diode, 3rd switching tube, first stabilivolt, described in 6th resistance and the 3rd diode, the Same Name of Ends of ancillary coil is through described 3rd capacity earth, the Same Name of Ends of described ancillary coil also connects the control end of described second switch pipe through described first stabilivolt and described 6th resistance, described 3rd diode is connected between different name end and the ground of described ancillary coil, the different name end of described ancillary coil even also connects the anode of described second diode, the negative electrode of described second diode connects the first end of described 3rd switching tube, the end that controls of described 3rd switching tube connects the first end of described second switch pipe, second end of described 3rd switching tube connects the control end of described second switch pipe, when the primary coil of described transformator releases energy when the secondary coil of described transformator, described ancillary coil produces inverse electromotive force, namely the electromotive force of the Same Name of Ends of described ancillary coil is less than the electromotive force of described ancillary coil different name end, power so that described 3rd switching tube conducting to described 3rd switching tube, described second switch pipe constitutes self-locking circuit with described 3rd switching tube, and then accelerate described first switching tube cut-off, electric current is successively through the Same Name of Ends of described ancillary coil, described second diode, 3rd switching tube, 6th resistance, first stabilivolt returns to the different name end of described ancillary coil thus constituting loop.
Wherein, described constant-current voltage-stabilizing drive circuit also includes the 7th resistance and photo-coupler, described 5th resistance is connected to the Same Name of Ends of the secondary coil of described transformator through described 7th resistance, described 7th resistance is used for current sample, first end of the detector of described photo-coupler connects the negative electrode of described first stabilivolt, and the second end of the detector of described photo-coupler connects the control end of described second switch pipe.
Wherein, described constant-current voltage-stabilizing drive circuit also includes voltage feedback circuit, described voltage feedback circuit includes voltage comparator, voltage stabilizing chip, 8th resistance, 9th resistance, tenth resistance, 4th electric capacity, 11st resistance, 4th diode and the 12nd resistance, described second DC voltage described 8th resistance of series connection and described 9th resistance ground connection, there is provided dividing potential drop in the inverting input of described voltage comparator with the junction point place between described 8th resistance and described 9th resistance, described second DC voltage is also connected described tenth resistance and described voltage stabilizing chip ground connection, to provide dividing potential drop in the in-phase input end of described voltage comparator at the junction point place of described tenth resistance and described voltage stabilizing chip, the negative electrode of described voltage stabilizing chip connects one end of described tenth resistance, the plus earth of described voltage stabilizing chip, the reference pole of described voltage stabilizing chip is connected to the negative electrode of described voltage stabilizing chip, it is connected in parallel between the inverting input of described voltage comparator and the outfan of described voltage comparator after described 4th resistance and described 11st resistant series, described 4th resistance and described 11st resistance are for frequency compensation, the outfan of described voltage comparator is connected to the negative electrode of the luminous organ of described photo-coupler with antireflux through described 4th diode, described second DC voltage is also connected to the anode of the luminous organ of described photo-coupler with power supply through described 12nd resistance.
Wherein, described constant-current voltage-stabilizing drive circuit also includes current feedback circuit, described current feedback circuit includes the 13rd resistance, 14th resistance, 15th resistance, 5th electric capacity, 16th resistance, current comparator and the 5th diode, described 13rd resistance is connected between the first end and the inverting input of described current comparator of described 7th resistance, described 14th resistance is connected between the second end and the in-phase input end of described current comparator of described 7th resistance, described 7th resistance two ends provide voltage to the two ends of described current comparator, described 15th resistance is connected between the in-phase input end of described current comparator and the negative electrode of described voltage stabilizing chip, it is connected in parallel between the in-phase input end of described current comparator and the outfan of described voltage comparator after described 5th electric capacity and described 16th resistant series, described 5th electric capacity and described 16th resistance are for frequency compensation, the outfan of described current comparator connects the negative electrode of the luminous organ of described photo-coupler with antireflux through described 5th diode.
Wherein, described first switching tube is NMOS tube, the control end of described first switching tube is grid, first end and second end of described first switching tube respectively drain and source electrode, described second switch pipe and the 3rd switching tube are NPN pipe, the control end of described second switch pipe and the 3rd switching tube is base stage, and the first end of described second switch pipe and the 3rd switching tube is colelctor electrode, and the second end of described second switch pipe and the 3rd switching tube is emitter stage.
Wherein, described constant-current voltage-stabilizing drive circuit also includes the 17th resistance, the 6th electric capacity and the 6th diode, first end of described 17th resistance is connected to the different name end of the described primary coil of described transformator, second end of described 17th resistance connects the negative electrode of described 6th diode, the anode of described 6th diode connects the Same Name of Ends of the described primary coil of described transformator, described 6th electric capacity and described 17th resistor coupled in parallel, described 17th resistance, the 6th electric capacity and the 6th diode are used for forming RCD peak absorbing circuit.
Wherein, described current rectifying and wave filtering circuit includes rectifier bridge, the 7th electric capacity and protective tube, the first input end of described rectifier bridge connects the live wire of described extraneous electric main through described protective tube, second input of described rectifier bridge connects the zero line of described extraneous electric main, first outfan of described rectifier bridge exports described first DC voltage, second output head grounding of described rectifier bridge, described 7th electric capacity is connected between the first outfan of described rectifier bridge and the second outfan.
On the other hand, The embodiment provides a kind of light fixture, including above-mentioned constant-current voltage-stabilizing drive circuit and LED light source.
A kind of constant-current voltage-stabilizing drive circuit and light fixture described in the embodiment of the present invention do not adopt pwm chip, less costly.Described constant-current voltage-stabilizing drive circuit produces signal mainly by the primary coil of its internal resistance, electric capacity and transformator, secondary coil and ancillary coil, and its frequency variation, stability are strong, reliability is high, compact, and function is simple.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit diagram of the first embodiment of a kind of constant-current voltage-stabilizing drive circuit of the present invention；
Fig. 2 is the circuit diagram of the second embodiment of a kind of constant-current voltage-stabilizing drive circuit of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Below with reference to the accompanying drawings embodiments of the invention are described.Referring to Fig. 1, for the schematic diagram of the first embodiment of constant-current voltage-stabilizing drive circuit a kind of in the present invention.Described constant-current voltage-stabilizing drive circuit includes current rectifying and wave filtering circuit, the first resistance R1, the second resistance R2, the 3rd resistance R3, the first switching tube Q1, second switch pipe Q2, transformator T, the first diode D1 and the first electric capacity C1.Described current rectifying and wave filtering circuit connects extraneous electric main, to convert external world's electric main to first DC voltage, first end of described first resistance R1 is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first resistance R1 is connected to the control end of described first switching tube Q1 through described second resistance R2, first end of described first switching tube Q1 connects the Same Name of Ends 2 of the primary coil N1 of described transformator T, the different name end 1 of the primary coil N1 of described transformator T is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first switching tube Q1 is connected to the control end of second switch pipe Q2, and through described 3rd resistance R3 ground connection, first end of described second switch pipe Q2 is connected to described first DC voltage by described first resistance R1, the second end ground connection of described second switch pipe Q2, the Same Name of Ends 4 of the secondary coil N2 of described transformator T connects the anode of described first diode D1, the negative electrode of described first diode D1 connects the anode of described first electric capacity C1, the negative electrode of described first electric capacity C1 connects different name end 3 ground connection of the secondary coil N2 of described transformator T, the anode of described first electric capacity C1 is as the first outfan OUT1 of described constant-current voltage-stabilizing drive circuit, the negative electrode of described first electric capacity C1 is as the second outfan OUT2 of described constant-current voltage-stabilizing drive circuit, described first electric capacity C1 is used for energy storage.When described first DC voltage powers to described first switching tube Q1 through described first resistance R1, described first switching tube Q1 conducting, the primary coil N1 of described transformator T is through described first switching tube Q1 and described 3rd resistance R3 ground connection, the primary coil N1 of described transformator T is thus storing energy, described 3rd resistance R3 provides the control end that dividing potential drop supplies electricity to described second switch pipe Q2, described second switch pipe Q2 is made to turn on, reduce the control terminal voltage of described first switching tube Q1, so that described first switching tube Q1 cut-off, the primary coil N1 of described transformator T progressively releases energy in the secondary coil N2 of described transformator T, the secondary coil N2 of described transformator T is through described first diode D1 and described first electric capacity C1 charging, and export stable electric current and voltage at the first outfan OUT1 and the second outfan OUT2 of described constant-current voltage-stabilizing drive circuit.
Referring to Fig. 2, for the embodiment of the present invention is implemented the schematic diagram of the second embodiment of constant-current voltage-stabilizing drive circuit.In the present embodiment, described constant-current voltage-stabilizing drive circuit also includes the 18th resistance R18, the 19th resistance R19 and the eight electric capacity C8.First end of described second switch pipe Q2 is connected to described first DC voltage by the described 18th resistance R18 and described first resistance R1 that connects, first end of described 18th resistance R18 connects first end of described Q2, second end of described 18th resistance R18 is connected to the common node of described first resistance R1 and the second resistance R2, to provide described first switching tube Q1 and second switch pipe Q2 bias current.Second end of described first switching tube Q1 is connected to the control end of described second switch pipe Q2 with current limliting through described 19th resistance R19, and described 8th electric capacity C8 is parallel to the two ends of described 19th resistance R19 with filtering.
Described constant-current voltage-stabilizing drive circuit also includes the second electric capacity C2, the 4th resistance R4 and the five resistance R5, for second DC voltage stable at described first outfan OUT1 and described second outfan OUT2 output, after described second electric capacity C2 and the four resistance R4 series connection, it is parallel to the two ends at described first diode D1, described second electric capacity C2 and the four resistance R4 forms RC peak absorbing circuit, and described 5th resistance R5 is connected between the Same Name of Ends 4 of the negative electrode of described first diode D1 and the secondary coil N2 of described transformator T.In present embodiment, described constant-current voltage-stabilizing drive circuit also includes inductance L1, display lamp LED1 and the nine electric capacity C9.First end of described 5th resistance R5 is connected to the negative electrode of described first diode D1 through described inductance L1, described 5th resistance R5 the second end be connected to the different name end 3 of secondary coil N2 of described transformator T through described display lamp LED1, described 9th electric capacity C9 is parallel to the two ends of described 5th resistance R5 and display lamp LED1.Described first diode D1, inductance L1, the first electric capacity C1 and the 9th electric capacity C9 constitute filter circuit with second DC voltage stable at described first outfan OUT1 and described second outfan OUT2 output.
Described constant-current voltage-stabilizing drive circuit also includes the ancillary coil N3 of described transformator T, 3rd electric capacity C3, second diode D2, 3rd switching tube Q3, first stabilivolt ZD1, 6th resistance R6 and the three diode D3, the Same Name of Ends 6 of described ancillary coil N3 is through described 3rd electric capacity C3 ground connection, the Same Name of Ends 6 of described ancillary coil N3 also connects the control end of described second switch pipe Q2 through described first stabilivolt ZD1 and described 6th resistance R6, described 3rd diode D3 is connected between different name end 5 and the ground of described ancillary coil, the different name end 5 of described ancillary coil N3 is also connected with the anode of described second diode D2, the negative electrode of described second diode D2 connects first end of described 3rd switching tube Q3, described 3rd switching tube Q3 controls the first end that end connects described second switch pipe Q2, second end of described 3rd switching tube Q3 connects the control end of described second switch pipe Q2.When the primary coil N1 of described transformator T releases energy when the secondary coil N2 of described transformator T, described ancillary coil N3 produces inverse electromotive force, namely the electromotive force of the Same Name of Ends 6 of described ancillary coil N3 is less than the electromotive force of described ancillary coil N3 different name end 5, power so that described 3rd switching tube Q3 conducting to described 3rd switching tube Q3, described second switch pipe Q2 and described 3rd switching tube Q3 constitutes self-locking circuit, and then accelerates described first switching tube Q1 cut-off.Electric current returns to the different name end 5 of described ancillary coil N3 thus constituting loop through the Same Name of Ends 6 of described ancillary coil N3, described second diode D2, the 3rd switching tube Q3, the 6th resistance R6, first stabilivolt ZD1 successively.In present embodiment, described constant-current voltage-stabilizing drive circuit also includes the 20th resistance R20 and the ten electric capacity C10, the different name end 5 of described ancillary coil N3 connects the anode of described second diode D2 with current limliting through described 20th resistance R20, and described tenth electric capacity C10 is parallel to the two ends of described second diode D2 with filtering.
Described constant-current voltage-stabilizing drive circuit also includes the 7th resistance R7 and photo-coupler IC1, for feedback circuit.Described 5th resistance R5 is connected to the different name end 3 of the secondary coil N2 of described transformator T through described 7th resistance R7, described 7th resistance R7 is used for current sample, first end of the detector of described photo-coupler IC1 connects the negative electrode of described first stabilivolt ZD1, and the second end of the detector of described photo-coupler IC1 connects the control end of described second switch pipe Q2.
Described constant-current voltage-stabilizing drive circuit also includes voltage feedback circuit, described voltage feedback circuit includes voltage comparator U1, voltage stabilizing chip U3, 8th resistance R8, 9th resistance R9, tenth resistance R10, 4th electric capacity C4, 11st resistance R11, 4th diode D4 and the 12nd resistance R12, the described second DC voltage described 8th resistance R8 of series connection and described 9th resistance R9 ground connection, there is provided dividing potential drop in the inverting input of described voltage comparator U1 with the junction point place between described 8th resistance R8 and described 9th resistance R9, described second DC voltage is also connected described tenth resistance R10 and described voltage stabilizing chip U3 ground connection, to provide dividing potential drop in the in-phase input end of described voltage comparator U1 at the junction point place of described tenth resistance R10 and described voltage stabilizing chip U3, the negative electrode of described voltage stabilizing chip U3 connects one end of described tenth resistance R10, the plus earth of described voltage stabilizing chip U3, the reference pole of described voltage stabilizing chip U3 is connected to the negative electrode of described voltage stabilizing chip U3, it is connected in parallel between the inverting input of described voltage comparator U1 and the outfan of described voltage comparator U1 after described 4th resistance C4 and described 11st resistance R11 series connection, described 4th resistance C4 and described 11st resistance R11 is used for frequency compensation, the outfan of described voltage comparator U1 is connected to the negative electrode of the luminous organ of described photo-coupler IC1 with antireflux through described 4th diode D4, described second DC voltage is also connected to the anode of the luminous organ of described photo-coupler IC1 with power supply through described 12nd resistance R12.
Described constant-current voltage-stabilizing drive circuit also includes current feedback circuit, described current feedback circuit includes the 13rd resistance R13, 14th resistance R14, 15th resistance R15, 5th electric capacity C5, 16th resistance R16, current comparator U2 and the 5th diode D5, described 13rd resistance R13 is connected between the first end and the inverting input of described current comparator U2 of described 7th resistance R7, described 14th resistance R14 is connected between the second end and the in-phase input end of described current comparator U2 of described 7th resistance R7, described 7th resistance R7 two ends provide voltage to the two ends of described current comparator U2, described 15th resistance R15 is connected between the in-phase input end of described current comparator U2 and the negative electrode of described voltage stabilizing chip U3, it is connected in parallel between the in-phase input end of described current comparator U2 and the outfan of described voltage comparator U1 after described 5th electric capacity C5 and described 16th resistance R16 series connection, described 5th electric capacity C5 and described 16th resistance R16 is used for frequency compensation, the outfan of described current comparator U2 connects the negative electrode of the luminous organ of described photo-coupler IC1 with antireflux through described 5th diode D5.
In present embodiment, described first switching tube Q1 is NMOS tube, the control end of described first switching tube Q1 is grid, first end and second end of described first switching tube Q1 respectively drain and source electrode, described second switch pipe Q2 and the three switching tube Q3 is NPN pipe, the control end of described second switch pipe Q2 and the three switching tube Q3 is base stage, first end of described second switch pipe Q2 and the three switching tube Q3 is colelctor electrode, and second end of described second switch pipe Q2 and the three switching tube Q3 is emitter stage.In other embodiments, described first switching tube Q1 is PMOS, and described second switch pipe Q2 and described 3rd switching tube Q3 is PNP pipe.
Described constant-current voltage-stabilizing drive circuit also includes the 17th resistance R17, 6th electric capacity C6 and the 6th diode D6, first end of described 17th resistance R17 is connected to the different name end 1 of the described primary coil N1 of described transformator T, second end of described 17th resistance R17 connects the negative electrode of described 6th diode D6, the anode of described 6th diode D6 connects the Same Name of Ends 2 of the described primary coil N1 of described transformator T, described 6th electric capacity C6 is in parallel with described 17th resistance R17, described 17th resistance R17, 6th electric capacity C6 and the 6th diode D6 is used for forming RCD peak absorbing circuit.
Described current rectifying and wave filtering circuit includes rectifier bridge D7, the 7th electric capacity C7 and protective tube F1, the first input end 7 of described rectifier bridge D7 connects the live wire N of described extraneous electric main through described protective tube F1, second input 8 of described rectifier bridge D7 connects the zero line L of described extraneous electric main, first outfan 9 of described rectifier bridge D7 exports described first DC voltage, second outfan 10 ground connection of described rectifier bridge D7, described 7th electric capacity C1 is connected between the first outfan 9 and second outfan 10 of described rectifier bridge D7.
The embodiment of the present invention additionally provides a kind of light fixture, including above-mentioned constant-current voltage-stabilizing drive circuit and LED light source (not shown).Described LED light source is connected between described first outfan OUT1 and described second outfan OUT2.
The constant-current voltage-stabilizing drive circuit of the embodiment of the present invention the second embodiment and the concrete principle of LED light source be:
The starting of oscillation of described constant-current voltage-stabilizing drive circuit: described extraneous electric main provides described first DC voltage through described current rectifying and wave filtering circuit, described first DC voltage is through described first resistance R1 and the second resistance R2, power to described first switching tube Q1, and through described 3rd resistance R3 ground connection, so that described first switching tube Q1 conducting.
When described first switching tube Q1 conducting, the electric current of the described primary coil N1 of described transformator T is linearly increasing, and energy storage is in described primary coil N1.Just producing Same Name of Ends 6 on the ancillary coil N3 of described transformator T, the induction electromotive force that different name end 5 is negative, thus providing bias voltage to through described first stabilivolt ZD1 and the six resistance R6 the first end of the detector of described photo-coupler IC1 and the second end.
The closedown of described constant-current voltage-stabilizing drive circuit: after the electric current of described primary coil N1 increases to a certain size, the bias voltage of described 3rd resistance R3 injects base current to described second switch pipe Q2, so that described second switch pipe Q2 conducting, reduce the voltage of described first switching tube Q1, described first switching tube Q1 ends gradually, and the electric current of described primary coil N1 is gradually reduced therewith.Character according to transformator T, ancillary coil N3 produces Same Name of Ends 6 negative, the induction electromotive force that different name end 5 is positive, and power to the colelctor electrode of described 3rd switching tube Q3 through described 20th resistance R20 and described second diode D2, making described 3rd switching tube Q3 conducting, described second switch pipe Q2 constitutes latching circuit with described 3rd switching tube Q3, thus accelerating described first switching tube Q1 electric discharge, and then accelerate the cut-off of described first switching tube Q1, to reduce the loss of described first switching tube Q1.
When the electric current of described primary coil N1 is gradually reduced therewith, the energy of described transformator T discharges to described secondary coil N2 gradually, described first diode D1 conducting, so that described first electric capacity C1, the 9th electric capacity C9 and inductance L1 charging, described display lamp LED1 starts luminescence.
After the primary coil N1 of the described transformator T energy stored discharges completely, the induction electromotive force on described ancillary coil disappears, and described second switch pipe Q2 and the three switching tube Q3 is turned off.Described constant-current voltage-stabilizing drive circuit starts second circulation, i.e. described constant-current voltage-stabilizing drive circuit starting of oscillation again.In circulating at second, owing to described first electric capacity C1, described 9th electric capacity C9 and described inductance L1 power to described display lamp LED1, described display lamp LED1 continues luminescence.
In described second circulation, during described constant-current voltage-stabilizing drive circuit starting of oscillation again, the first end and second end of the detector of described photo-coupler IC1 have bias voltage.When described first outfan OUT1 and described second outfan OUT2 zero load, no current feeds back.Described second DC voltage is input to the inverting input of described voltage comparator U1 after described 8th resistance R8 and described 9th resistance R9 dividing potential drop, described second DC voltage also provides accurate reference voltage through described tenth resistance R10 and voltage stabilizing chip U3, to be input to the in-phase input end of described voltage comparator U1.When described 8th resistance R8 and the described 9th resistance R9 voltage separated is higher than described reference voltage, described voltage comparator U1 overturns and is output as to bear, described photo-coupler IC1 turns on, thus injecting base current through described first stabilivolt ZD1 and the six resistance R6 at described second switch pipe Q2, accelerate described second switch pipe Q2 conducting, and then described first switching tube Q1 is ended in advance, finally make described second DC voltage that the output of described constant-current voltage-stabilizing drive circuit is stable.
In described second circulation, when described constant-current voltage-stabilizing drive circuit is again switched off, the first end of the detector of described photo-coupler IC1 and the second end are without bias voltage, and no-voltage feeds back.
In described second circulation, during described constant-current voltage-stabilizing drive circuit starting of oscillation again, the first end and second end of the detector of described photo-coupler IC1 have bias voltage.When described first outfan OUT1 and described second outfan OUT2 band load time, described load current along with described primary coil N1 electric current reduce and and reduce, described 7th resistance R7 give described current comparator U2 provide voltage.When described load current is bigger than normal, described current comparator U2 overturns and is output as to bear, described photo-coupler IC1 turns on, thus injecting base current through described first stabilivolt ZD1 and the six resistance R6 at described second switch pipe Q2, accelerate described second switch pipe Q2 conducting, and then described first switching tube Q1 is ended in advance, finally make the described load current that the output of described constant-current voltage-stabilizing drive circuit is stable.
A kind of constant-current voltage-stabilizing drive circuit described in the embodiment of the present invention does not adopt pwm chip, less costly.Described constant-current voltage-stabilizing drive circuit produces signal mainly by its internal resistance, the primary coil N1 of electric capacity and transformator T, secondary coil N2 and ancillary coil N3, and its frequency variation, stability are strong, reliability is high, compact, and function is simple.
Embodiments described above, is not intended that the restriction to this technical scheme protection domain.The amendment made within any spirit at above-mentioned embodiment and principle, equivalent replacement and improvement etc., should be included within the protection domain of this technical scheme.
Claims (9)
1. a constant-current voltage-stabilizing drive circuit, it is characterized in that, including current rectifying and wave filtering circuit, first resistance, second resistance, 3rd resistance, first switching tube, second switch pipe, transformator, first diode and the first electric capacity, described current rectifying and wave filtering circuit connects extraneous electric main, to convert external world's electric main to first DC voltage, first end of described first resistance is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first resistance is connected to the control end of described first switching tube through described second resistance, first end of described first switching tube connects the Same Name of Ends of the primary coil of described transformator, the different name end of the primary coil of described transformator is connected to described current rectifying and wave filtering circuit to receive described first DC voltage, second end of described first switching tube is connected to the control end of second switch pipe, and through described 3rd resistance eutral grounding, first end of described second switch pipe is connected to described first DC voltage by described first resistance, second end ground connection of described second switch pipe, the Same Name of Ends of the secondary coil of described transformator connects the anode of described first diode, the negative electrode of described first diode connects the anode of described first electric capacity, the negative electrode of described first electric capacity connects different name end the ground connection of the secondary coil of described transformator, the anode of described first electric capacity is as the first outfan of described constant-current voltage-stabilizing drive circuit, the negative electrode of described first electric capacity is as the second outfan of described constant-current voltage-stabilizing drive circuit, described first electric capacity is used for energy storage, when described first DC voltage powers to described first switching tube through described first resistance, described first switching tube conducting, the primary coil of described transformator is through described first switching tube and described 3rd resistance eutral grounding, the primary coil of described transformator is thus storing energy, described 3rd resistance provides the control end that dividing potential drop supplies electricity to described second switch pipe, described second switch pipe is made to turn on, reduce the control terminal voltage of described first switching tube, so that described first switching tube cut-off, the primary coil of described transformator progressively releases energy in the secondary coil of described transformator, the secondary coil of described transformator is through described first diode and described first electric capacity charging, and export stable electric current and voltage at the first outfan of described constant-current voltage-stabilizing drive circuit and the second outfan, described constant-current voltage-stabilizing drive circuit also includes the first stabilivolt, 7th resistance and photo-coupler, described first stabilivolt connects the control end of described second switch pipe, described 7th resistance is used for current sample, first end of the detector of described photo-coupler connects the negative electrode of described first stabilivolt, second end of the detector of described photo-coupler connects the control end of described second switch pipe.
2. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 1, it is characterized in that, described constant-current voltage-stabilizing drive circuit also includes the second electric capacity, the 4th resistance and the 5th resistance, for second DC voltage stable at described first outfan and described second outfan output, after described second electric capacity and the 4th resistant series, it is parallel to the two ends of described first diode, described second electric capacity and the 4th resistance composition RC peak absorbing circuit, described 5th resistance is connected between the different name end of the negative electrode of described first diode and the secondary coil of described transformator.
3. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 2, it is characterized in that, described constant-current voltage-stabilizing drive circuit also includes the ancillary coil of described transformator, 3rd electric capacity, second diode, 3rd switching tube, first stabilivolt, described in 6th resistance and the 3rd diode, the Same Name of Ends of ancillary coil is through described 3rd capacity earth, the Same Name of Ends of described ancillary coil also connects the control end of described second switch pipe through described first stabilivolt and described 6th resistance, described 3rd diode is connected between different name end and the ground of described ancillary coil, the different name end of described ancillary coil even also connects the anode of described second diode, the negative electrode of described second diode connects the first end of described 3rd switching tube, the end that controls of described 3rd switching tube connects the first end of described second switch pipe, second end of described 3rd switching tube connects the control end of described second switch pipe, when the primary coil of described transformator releases energy when the secondary coil of described transformator, described ancillary coil produces inverse electromotive force, namely the electromotive force of the Same Name of Ends of described ancillary coil is less than the electromotive force of described ancillary coil different name end, power so that described 3rd switching tube conducting to described 3rd switching tube, described second switch pipe constitutes self-locking circuit with described 3rd switching tube, and then accelerate described first switching tube cut-off, electric current is successively through the Same Name of Ends of described ancillary coil, described second diode, 3rd switching tube, 6th resistance, first stabilivolt returns to the different name end of described ancillary coil thus constituting loop.
4. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 3, it is characterized in that, described constant-current voltage-stabilizing drive circuit also includes voltage feedback circuit, described voltage feedback circuit includes voltage comparator, voltage stabilizing chip, 8th resistance, 9th resistance, tenth resistance, 4th electric capacity, 11st resistance, 4th diode and the 12nd resistance, described second DC voltage described 8th resistance of series connection and described 9th resistance ground connection, there is provided dividing potential drop in the inverting input of described voltage comparator with the junction point place between described 8th resistance and described 9th resistance, described second DC voltage is also connected described tenth resistance and described voltage stabilizing chip ground connection, to provide dividing potential drop in the in-phase input end of described voltage comparator at the junction point place of described tenth resistance and described voltage stabilizing chip, the negative electrode of described voltage stabilizing chip connects one end of described tenth resistance, the plus earth of described voltage stabilizing chip, the reference pole of described voltage stabilizing chip is connected to the negative electrode of described voltage stabilizing chip, it is connected in parallel between the inverting input of described voltage comparator and the outfan of described voltage comparator after described 4th resistance and described 11st resistant series, described 4th resistance and described 11st resistance are for frequency compensation, the outfan of described voltage comparator is connected to the negative electrode of the luminous organ of described photo-coupler with antireflux through described 4th diode, described second DC voltage is also connected to the anode of the luminous organ of described photo-coupler with power supply through described 12nd resistance.
5. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 4, it is characterized in that, described constant-current voltage-stabilizing drive circuit also includes current feedback circuit, described current feedback circuit includes the 13rd resistance, 14th resistance, 15th resistance, 5th electric capacity, 16th resistance, current comparator and the 5th diode, described 13rd resistance is connected between the first end and the inverting input of described current comparator of described 7th resistance, described 14th resistance is connected between the second end and the in-phase input end of described current comparator of described 7th resistance, described 7th resistance two ends provide voltage to the two ends of described current comparator, described 15th resistance is connected between the in-phase input end of described current comparator and the negative electrode of described voltage stabilizing chip, it is connected in parallel between the in-phase input end of described current comparator and the outfan of described voltage comparator after described 5th electric capacity and described 16th resistant series, described 5th electric capacity and described 16th resistance are for frequency compensation, the outfan of described current comparator connects the negative electrode of the luminous organ of described photo-coupler with antireflux through described 5th diode.
6. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 3, it is characterized in that, described first switching tube is NMOS tube, the control end of described first switching tube is grid, first end and second end of described first switching tube respectively drain and source electrode, described second switch pipe and the 3rd switching tube are NPN pipe, the control end of described second switch pipe and the 3rd switching tube is base stage, first end of described second switch pipe and the 3rd switching tube is colelctor electrode, and the second end of described second switch pipe and the 3rd switching tube is emitter stage.
7. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 1, it is characterized in that, described constant-current voltage-stabilizing drive circuit also includes the 17th resistance, 6th electric capacity and the 6th diode, first end of described 17th resistance is connected to the different name end of the described primary coil of described transformator, second end of described 17th resistance connects the negative electrode of described 6th diode, the anode of described 6th diode connects the Same Name of Ends of the described primary coil of described transformator, described 6th electric capacity and described 17th resistor coupled in parallel, described 17th resistance, 6th electric capacity and the 6th diode are used for forming RCD peak absorbing circuit.
8. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 1, it is characterized in that, described current rectifying and wave filtering circuit includes rectifier bridge, the 7th electric capacity and protective tube, the first input end of described rectifier bridge connects the live wire of described extraneous electric main through described protective tube, second input of described rectifier bridge connects the zero line of described extraneous electric main, first outfan of described rectifier bridge exports described first DC voltage, second output head grounding of described rectifier bridge, described 7th electric capacity is connected between the first outfan of described rectifier bridge and the second outfan.
9. a light fixture, it is characterised in that include a kind of constant-current voltage-stabilizing drive circuit described in any one of claim 1～8 and LED light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210501404.XA CN103857109B (en) | 2012-11-30 | 2012-11-30 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210501404.XA CN103857109B (en) | 2012-11-30 | 2012-11-30 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103857109A CN103857109A (en) | 2014-06-11 |
| CN103857109B true CN103857109B (en) | 2016-06-29 |
Family
ID=50864194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210501404.XA Active CN103857109B (en) | 2012-11-30 | 2012-11-30 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103857109B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277914B (en) * | 2019-07-19 | 2020-11-27 | 电子科技大学 | Reverse flow comparator suitable for Boost converter |
| CN112399660B (en) * | 2019-08-16 | 2024-05-28 | 上海苏萨电子科技有限公司 | Driving circuit and photoionization detector |
| CN112816784A (en) * | 2020-12-31 | 2021-05-18 | 广电计量检测（成都）有限公司 | Resistance test circuit and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243392Y (en) * | 2008-07-04 | 2009-05-20 | 比亚迪股份有限公司 | LED drive circuit |
| CN201533444U (en) * | 2009-08-18 | 2010-07-21 | 东莞市格尔电器科技有限公司 | Dimmable electronic ballast of LED auxiliary lighting and energy-saving lamp provided with same |
| CN201919204U (en) * | 2010-11-19 | 2011-08-03 | 汤德明 | LED (light-emitting diode) drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4525287B2 (en) * | 2004-10-14 | 2010-08-18 | ソニー株式会社 | Light emitting element driving device and display device |
-
2012
- 2012-11-30 CN CN201210501404.XA patent/CN103857109B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243392Y (en) * | 2008-07-04 | 2009-05-20 | 比亚迪股份有限公司 | LED drive circuit |
| CN201533444U (en) * | 2009-08-18 | 2010-07-21 | 东莞市格尔电器科技有限公司 | Dimmable electronic ballast of LED auxiliary lighting and energy-saving lamp provided with same |
| CN201919204U (en) * | 2010-11-19 | 2011-08-03 | 汤德明 | LED (light-emitting diode) drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103857109A (en) | 2014-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2914068B1 (en) | Electronic transformer-controlled two-wire two-way LED (light-emitting diode) lamp string | |
| CN201854482U (en) | LED power circuit | |
| CN102026448A (en) | LED power circuit | |
| CN104507227B (en) | Transformerless constant-current power supply circuit | |
| CN104185333A (en) | Constant-current constant-voltage circuit and illuminating device | |
| CN103857109B (en) | A kind of constant-current voltage-stabilizing drive circuit and light fixture | |
| CN201699598U (en) | Switch power adapter | |
| CN206364917U (en) | LED backlight circuit, power panel of television and television set | |
| CN202872640U (en) | A power supply module capable of outputting in variable and low cross regulation rates | |
| CN220254710U (en) | High-low voltage isolated pulse lamp control circuit, pulse lamp and refrigerator | |
| CN204305425U (en) | Transformerless constant-current power supply circuit | |
| CN204442777U (en) | A kind of mine lamp and overvoltage protection control circuits thereof | |
| CN104426377A (en) | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor | |
| CN103490387B (en) | A kind of single-stage PFC fly-back power source input under-voltage protection circuit | |
| CN203057005U (en) | Switching power supply device of air purifier | |
| CN108365756A (en) | A kind of Switching Power Supply | |
| CN2579075Y (en) | IGCT driving power supply | |
| CN103369764B (en) | A LED driving circuit and a LED lamp | |
| CN207692089U (en) | Power circuit and its lighting apparatus | |
| CN208316560U (en) | A kind of double tube positive exciting driving circuit | |
| CN203457054U (en) | Wide input voltage flyback switching power supply suitable for DC motor driving | |
| CN102695318A (en) | A driving circuit of lamp and a ballast | |
| CN205305162U (en) | High -efficient constant current voltage dropping power supply | |
| CN204993947U (en) | LED drive power supply makes up dimmer circuit | |
| CN204157003U (en) | Top box of digital machine front control board VFD shows power supply circuits |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |