CN103857109A - Constant-current voltage-stabilizing drive circuit and light fixture - Google Patents
Constant-current voltage-stabilizing drive circuit and light fixture Download PDFInfo
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- CN103857109A CN103857109A CN201210501404.XA CN201210501404A CN103857109A CN 103857109 A CN103857109 A CN 103857109A CN 201210501404 A CN201210501404 A CN 201210501404A CN 103857109 A CN103857109 A CN 103857109A
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Abstract
The invention discloses a constant-current voltage-stabilizing drive circuit comprising a rectifier and filter circuit, a first resistor, a second resistor, a third resistor, a first switching tube, a second switching tube, a transformer, a first diode and a first capacitor. According to the embodiment of the invention, the cost of the circuit is low. On the basis of the internal resistors, the capacitor, the primary coil, the second coil, and the auxiliary coil of the transformer, signals are generated. Moreover, the frequency is changing; the stability and reliability are high; the size is small and exquisite; and the function is simple. In addition, the invention also discloses a light fixture with the constant-current voltage-stabilizing drive circuit.
Description
Technical field
The present invention relates to LED light fixture and drive field, relate in particular to a kind of constant-current voltage-stabilizing drive circuit and light fixture.
Background technology
Existing Switching Power Supply and constant current drive and mostly adopt pwm chip (Pulse Width Modulation), and its switching frequency is fixed, and controls the size of output voltage and electric current by adjusting pulse bandwidth.Adopt the cost of pwm chip higher.
Summary of the invention
Technical problem to be solved by this invention is, a kind of constant-current voltage-stabilizing drive circuit is provided.Can effectively reduce costs, and simple in structure, stability is strong, reliability is high.
In order to solve the problems of the technologies described above, embodiments of the invention provide a kind of constant-current voltage-stabilizing drive circuit, comprise current rectifying and wave filtering circuit, the first resistance, the second resistance, the 3rd resistance, the first switching tube, second switch pipe, transformer, the first diode and the first electric capacity, described current rectifying and wave filtering circuit connects extraneous electric main, to convert extraneous electric main to first direct voltage, the first end of described the first resistance is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first resistance is connected in the control end of described the first switching tube through described the second resistance, the first end of described the first switching tube connects the Same Name of Ends of the primary coil of described transformer, the different name end of the primary coil of described transformer is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first switching tube is connected to the control end of second switch pipe, and through described the 3rd grounding through resistance, the first end of described second switch pipe is connected to described the first direct voltage by described the first resistance, the second end ground connection of described second switch pipe, the Same Name of Ends of the secondary coil of described transformer connects the anode of described the first diode, the negative electrode of described the first diode connects the anode of described the first electric capacity, the negative electrode of described the first electric capacity connects different name end the ground connection of the secondary coil of described transformer, the anode of described the first electric capacity is as the first output of described constant-current voltage-stabilizing drive circuit, the negative electrode of described the first electric capacity is as the second output of described constant-current voltage-stabilizing drive circuit, described the first electric capacity is for energy storage, when described the first direct voltage is given described the first switching tube power supply through described the first resistance, described the first switching tube conducting, the primary coil of described transformer is through described the first switching tube and described the 3rd grounding through resistance, thereby the primary coil storage power of described transformer, described the 3rd resistance provides dividing potential drop to power to the control end of described second switch pipe, make the conducting of described second switch pipe, reduce the control end voltage of described the first switching tube, thereby make described the first switching tube cut-off, the primary coil of described transformer progressively releases energy in the secondary coil of described transformer, the secondary coil of described transformer is through described the first diode and described the first capacitor charging, and at the first output of described constant-current voltage-stabilizing drive circuit and electric current and the voltage of the second output stable output.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises the second electric capacity, the 4th resistance and the 5th resistance, for the second direct voltage at described the first output and described the second output stable output, after described the second electric capacity is connected with the 4th resistance, be parallel to the two ends of described the first diode, described the second electric capacity and the 4th resistance composition RC peak absorbing circuit, described the 5th resistance is connected between the negative electrode of described the first diode and the different name end of the secondary coil of described transformer.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises the ancillary coil of described transformer, the 3rd electric capacity, the second diode, the 3rd switching tube, the first voltage-stabiliser tube, described in the 6th resistance and the 3rd diode, the Same Name of Ends of ancillary coil is through described the 3rd capacity earth, the Same Name of Ends of described ancillary coil is also connected the control end of described second switch pipe with described the 6th resistance through described the first voltage-stabiliser tube, described the 3rd diode is connected between the different name end and ground of described ancillary coil, the different name end of described ancillary coil connects the anode that also connects described the second diode, the negative electrode of described the second diode connects the first end of described the 3rd switching tube, the control end of described the 3rd switching tube connects the first end of described second switch pipe, the second end of described the 3rd switching tube connects the control end of described second switch pipe, in the time that the primary coil of described transformer releases energy secondary coil in described transformer, described ancillary coil produces inverse electromotive force, it is the electromotive force that the electromotive force of the Same Name of Ends of described ancillary coil is less than described ancillary coil different name end, make described the 3rd switching tube conducting to described the 3rd switching tube power supply, described second switch pipe and described the 3rd switching tube form self-locking circuit, and then accelerate described the first switching tube and end, electric current is successively through the Same Name of Ends of described ancillary coil, described the second diode, the 3rd switching tube, the 6th resistance, thereby the first voltage-stabiliser tube is got back to the different name end of described ancillary coil and is formed loop.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises the 7th resistance and optical coupler, described the 5th resistance is connected in the Same Name of Ends of the secondary coil of described transformer through described the 7th resistance, described the 7th resistance is for current sample, the first end of the detector of described optical coupler connects the negative electrode of described the first voltage-stabiliser tube, and the second end of the detector of described optical coupler connects the control end of described second switch pipe.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises voltage feedback circuit, described voltage feedback circuit comprises voltage comparator, voltage stabilizing chip, the 8th resistance, the 9th resistance, the tenth resistance, the 4th electric capacity, the 11 resistance, the 4th diode and the 12 resistance, described the second direct voltage connect described the 8th resistance and described the 9th resistance ground connection, provide a point inverting input that is pressed on described voltage comparator with the tie point place between described the 8th resistance and described the 9th resistance, described the second direct voltage also connect described the tenth resistance and described voltage stabilizing chip ground connection, to provide a point in-phase input end that is pressed on described voltage comparator at the tie point place of described the tenth resistance and described voltage stabilizing chip, the negative electrode of described voltage stabilizing chip connects one end of described the tenth resistance, the plus earth of described voltage stabilizing chip, the reference utmost point of described voltage stabilizing chip is connected in the negative electrode of described voltage stabilizing chip, after described the 4th resistance and described the 11 resistance series connection, be connected in parallel between the inverting input of described voltage comparator and the output of described voltage comparator, described the 4th resistance and described the 11 resistance are for frequency compensation, the output of described voltage comparator is connected in the negative electrode of photophore of described optical coupler with antireflux through described the 4th diode, described the second direct voltage also through described the 12 resistance be connected in described optical coupler photophore anode with power supply.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises current feedback circuit, described current feedback circuit comprises the 13 resistance, the 14 resistance, the 15 resistance, the 5th electric capacity, the 16 resistance, current comparator and the 5th diode, described the 13 resistance is connected between described the 7th first end of resistance and the inverting input of described current comparator, described the 14 resistance is connected between second end and the in-phase input end of described current comparator of described the 7th resistance, described the 7th resistance two ends provide the two ends of voltage to described current comparator, described the 15 resistance is connected between the in-phase input end of described current comparator and the negative electrode of described voltage stabilizing chip, after described the 5th electric capacity and described the 16 resistance series connection, be connected in parallel between the in-phase input end of described current comparator and the output of described voltage comparator, described the 5th electric capacity and described the 16 resistance are for frequency compensation, the output of described current comparator connects the negative electrode of photophore of described optical coupler with antireflux through described the 5th diode.
Wherein, described the first switching tube is NMOS pipe, described the first control end opening the light is grid, described the first first end opening the light and the second end are respectively drain electrode 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 collector electrode, and the second end of described second switch pipe and the 3rd open pipe is emitter.
Wherein, described constant-current voltage-stabilizing drive circuit also comprises the 17 resistance, the 6th electric capacity and the 6th diode, the first end of described the 17 resistance is connected in the different name end of the described primary coil of described transformer, the second end of described the 17 resistance connects the negative electrode of described the 6th diode, the Same Name of Ends of the described primary coil of transformer described in the anodic bonding of described the 6th diode, described the 6th electric capacity is in parallel with described the 17 resistance, and described the 17 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 comprises 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, the second input of described rectifier bridge connects the zero line of described extraneous electric main, the first output of described rectifier bridge is exported described the first direct voltage, the second output head grounding of described rectifier bridge, described the 7th electric capacity is connected between first output and the second output of described rectifier bridge.
On the other hand, embodiments of the invention provide a kind of light fixture, comprise 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, and cost is lower.Described constant-current voltage-stabilizing drive circuit is mainly by its internal resistance, and the primary coil of electric capacity and transformer, secondary coil and ancillary coil produce signal, and its frequency variation, stability is strong, reliability is high, volume is small and exquisite, and function is simple.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art 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, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the first execution mode of a kind of constant-current voltage-stabilizing drive circuit of the present invention;
Fig. 2 is the circuit diagram of the second execution mode of a kind of constant-current voltage-stabilizing drive circuit of the present invention.
Embodiment
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, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Below with reference to accompanying drawing, embodiments of the invention are described.Referring to Fig. 1, it is the schematic diagram of the first execution mode of a kind of constant-current voltage-stabilizing drive circuit in the present invention.Described constant-current voltage-stabilizing drive circuit comprises current rectifying and wave filtering circuit, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first switching tube Q1, second switch pipe Q2, transformer T, the first diode D1 and the first capacitor C 1.Described current rectifying and wave filtering circuit connects extraneous electric main, to convert extraneous electric main to first direct voltage, the first end of described the first resistance R 1 is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first resistance R 1 is connected in the control end of described the first switching tube Q1 through described the second resistance R 2, the first end of described the first switching tube Q1 connects the Same Name of Ends 2 of the primary coil N1 of described transformer T, the different name end 1 of the primary coil N1 of described transformer T is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first switching tube Q1 is connected to the control end of second switch pipe Q2, and through described the 3rd resistance R 3 ground connection, the first end of described second switch pipe Q2 is connected to described the first direct voltage by described the first resistance R 1, the second end ground connection of described second switch pipe Q2, the Same Name of Ends 4 of the secondary coil N2 of described transformer T connects the anode of described the first diode D1, the negative electrode of described the first diode D1 connects the anode of described the first capacitor C 1, the negative electrode of described the first capacitor C 1 connects different name end 3 ground connection of the secondary coil N2 of described transformer T, the anode of described the first capacitor C 1 is as the first output OUT1 of described constant-current voltage-stabilizing drive circuit, the negative electrode of described the first capacitor C 1 is as the second output OUT2 of described constant-current voltage-stabilizing drive circuit, described the first capacitor C 1 is for energy storage.When described the first direct voltage is given described the first switching tube Q1 power supply through described the first resistance R 1, described the first switching tube Q1 conducting, the primary coil N1 of described transformer T is through described the first switching tube Q1 and described the 3rd resistance R 3 ground connection, thereby the primary coil N1 storage power of described transformer T, described the 3rd resistance R 3 provides dividing potential drop to power to the control end of described second switch pipe Q2, make described second switch pipe Q2 conducting, reduce the control end voltage of described the first switching tube Q1, thereby make described the first switching tube Q1 cut-off, the primary coil N1 of described transformer T progressively releases energy in the secondary coil N2 of described transformer T, the secondary coil N2 of described transformer T charges through described the first diode D1 and described the first capacitor C 1, and at the first output OUT1 of described constant-current voltage-stabilizing drive circuit and electric current and the voltage of the second output OUT2 stable output.
Referring to Fig. 2, for implementing the schematic diagram of the second execution mode of constant-current voltage-stabilizing drive circuit in the embodiment of the present invention.In the present embodiment, described constant-current voltage-stabilizing drive circuit also comprises the 18 resistance R the 18, the 19 resistance R 19 and the 8th capacitor C 8.The first end of described second switch pipe Q2 is connected to described the first direct voltage by connect described the 18 resistance R 18 and described the first resistance R 1, the first end of described the 18 resistance R 18 connects the first end of described Q2, the second end of described the 18 resistance R 18 is connected to the common node of described the first resistance R 1 and the second resistance R 2, so that described the first switching tube Q1 and second switch pipe Q2 bias current to be provided.The control end that the second end of described the first switching tube Q1 is connected in described second switch pipe Q2 through described the 19 resistance R 19 is with current limliting, and the two ends that described the 8th capacitor C 8 is parallel to described the 19 resistance R 19 are with filtering.
Described constant-current voltage-stabilizing drive circuit also comprises the second capacitor C 2, the 4th resistance R 4 and the 5th resistance R 5, for the second direct voltage at described the first output OUT1 and described the second output OUT2 stable output, after described the second capacitor C 2 and the 4th resistance R 4 series connection, be parallel to the two ends at described the first diode D1, described the second capacitor C 2 and the 4th resistance R 4 form RC peak absorbing circuit, and described the 5th resistance R 5 is connected between the negative electrode of described the first diode D1 and the Same Name of Ends 4 of the secondary coil N2 of described transformer T.In present embodiment, described constant-current voltage-stabilizing drive circuit also comprises inductance L 1, indicator light LED1 and the 9th capacitor C 9.The first end of described the 5th resistance R 5 is connected in the negative electrode of described the first diode D1 through described inductance L 1, described the 5th resistance R 5 the second end be connected in the different name end 3 of the secondary coil N2 of described transformer T through described indicator light LED1, described the 9th capacitor C 9 is parallel to the two ends of described the 5th resistance R 5 and indicator light LED1.Described the first diode D1, inductance L 1, the first capacitor C 1 and the 9th capacitor C 9 form filter circuit with the second direct voltage at described the first output OUT1 and described the second output OUT2 stable output.
Described constant-current voltage-stabilizing drive circuit also comprises the ancillary coil N3 of described transformer T, the 3rd capacitor C 3, the second diode D2, the 3rd switching tube Q3, the first voltage-stabiliser tube ZD1, the 6th resistance R 6 and the 3rd diode D3, the Same Name of Ends 6 of described ancillary coil N3 is through described the 3rd capacitor C 3 ground connection, the Same Name of Ends 6 of described ancillary coil N3 is also connected the control end of described second switch pipe Q2 with described the 6th resistance R 6 through described the first voltage-stabiliser tube ZD1, described the 3rd diode D3 is connected between the different name end 5 and ground of described ancillary coil, the different name end 5 of described ancillary coil N3 also connects the anode of described the second diode D2, the negative electrode of described the second diode D2 connects the first end of described the 3rd switching tube Q3, the control end of described the 3rd switching tube Q3 connects the first end of described second switch pipe Q2, the second end of described the 3rd switching tube Q3 connects the control end of described second switch pipe Q2.In the time that the primary coil N1 of described transformer T releases energy secondary coil N2 in described transformer T, described ancillary coil N3 produces inverse electromotive force, it is the electromotive force that the electromotive force of the Same Name of Ends 6 of described ancillary coil N3 is less than described ancillary coil N3 different name end 5, make described the 3rd switching tube Q3 conducting to described the 3rd switching tube Q3 power supply, described second switch pipe Q2 and described the 3rd switching tube Q3 form self-locking circuit, and then accelerate described the first switching tube Q1 cut-off.Electric current is successively through the Same Name of Ends 6 of described ancillary coil N3, described the second diode D2, the 3rd switching tube Q3, and the 6th resistance R 6, forms loops thereby the first voltage-stabiliser tube ZD1 gets back to the different name end 5 of described ancillary coil N3.In present embodiment, described constant-current voltage-stabilizing drive circuit also comprises the 20 resistance R 20 and the tenth capacitor C 10, the anode that the different name end 5 of described ancillary coil N3 connects described the second diode D2 through described the 20 resistance R 20 is with current limliting, and the two ends that described the tenth capacitor C 10 is parallel to described the second diode D2 are with filtering.
Described constant-current voltage-stabilizing drive circuit also comprises the 7th resistance R 7 and optical coupler IC1, for feedback circuit.Described the 5th resistance R 5 is connected in the different name end 3 of the secondary coil N2 of described transformer T through described the 7th resistance R 7, described the 7th resistance R 7 is for current sample, the first end of the detector of described optical coupler IC1 connects the negative electrode of described the first voltage-stabiliser tube ZD1, and the second end of the detector of described optical coupler IC1 connects the control end of described second switch pipe Q2.
Described constant-current voltage-stabilizing drive circuit also comprises voltage feedback circuit, described voltage feedback circuit comprises voltage comparator U1, voltage stabilizing chip U3, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the 4th capacitor C 4, the 11 resistance R 11, the 4th diode D4 and the 12 resistance R 12, described the second direct voltage connect described the 8th resistance R 8 and described the 9th resistance R 9 ground connection, provide a point inverting input that is pressed on described voltage comparator U1 with the tie point place between described the 8th resistance R 8 and described the 9th resistance R 9, described the second direct voltage also connect described the tenth resistance R 10 and described voltage stabilizing chip U3 ground connection, to provide a point in-phase input end that is pressed on described voltage comparator U1 at the tie point place of described the tenth resistance R 10 and described voltage stabilizing chip U3, the negative electrode of described voltage stabilizing chip U3 connects one end of described the tenth resistance R 10, the plus earth of described voltage stabilizing chip U3, the reference utmost point of described voltage stabilizing chip U3 is connected in the negative electrode of described voltage stabilizing chip U3, after described the 4th resistance C4 and described the 11 resistance R 11 series connection, be connected in parallel between the inverting input of described voltage comparator U1 and the output of described voltage comparator U1, described the 4th resistance C4 and described the 11 resistance R 11 are for frequency compensation, the output of described voltage comparator U1 is connected in the negative electrode of photophore of described optical coupler IC1 with antireflux through described the 4th diode D4, described the second direct voltage also through described the 12 resistance R 12 be connected in described optical coupler IC1 photophore anode with power supply.
Described constant-current voltage-stabilizing drive circuit also comprises current feedback circuit, described current feedback circuit comprises the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 5th capacitor C 5, the 16 resistance R 16, current comparator U2 and the 5th diode D5, described the 13 resistance R 13 is connected between the first end of described the 7th resistance R 7 and the inverting input of described current comparator U2, described the 14 resistance R 14 is connected between the second end of described the 7th resistance R 7 and the in-phase input end of described current comparator U2, described the 7th resistance R 7 two ends provide the two ends of voltage to described current comparator U2, described the 15 resistance R 15 is connected between the in-phase input end of described current comparator U2 and the negative electrode of described voltage stabilizing chip U3, after described the 5th capacitor C 5 and described the 16 resistance R 16 series connection, be connected in parallel between the in-phase input end of described current comparator U2 and the output of described voltage comparator U1, described the 5th capacitor C 5 and described the 16 resistance R 16 are for frequency compensation, the output of described current comparator U2 connects the negative electrode of photophore of described optical coupler IC1 with antireflux through described the 5th diode D5.
In present embodiment, described the first switching tube Q1 is NMOS pipe, the described first control end that opens the light Q1 is grid, the described first first end and the second end that opens the light Q1 is respectively drain electrode and source electrode, described second switch pipe Q2 and the 3rd switching tube Q3 are NPN pipe, the control end of described second switch pipe Q2 and the 3rd switching tube Q3 is base stage, and the first end of described second switch pipe Q2 and the 3rd switching tube Q3 is collector electrode, and the second end of described second switch pipe Q2 and the 3rd open pipe Q3 is emitter.In other embodiments, described the first switching tube Q1 is PMOS pipe, and described second switch pipe Q2 and described the 3rd switching tube Q3 are PNP pipe.
Described constant-current voltage-stabilizing drive circuit also comprises the 17 resistance R 17, the 6th capacitor C 6 and the 6th diode D6, the first end of described the 17 resistance R 17 is connected in the different name end 1 of the described primary coil N1 of described transformer T, the second end of described the 17 resistance R 17 connects the negative electrode of described the 6th diode D6, the Same Name of Ends 2 of the described primary coil N1 of transformer T described in the anodic bonding of described the 6th diode D6, described the 6th capacitor C 6 is in parallel with described the 17 resistance R 17, described the 17 resistance R 17, the 6th capacitor C 6 and the 6th diode D6 are used for forming RCD peak absorbing circuit.
Described current rectifying and wave filtering circuit comprises rectifier bridge D7, the 7th capacitor C 7 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, the second input 8 of described rectifier bridge D7 connects the zero line L of described extraneous electric main, the first output 9 of described rectifier bridge D7 is exported described the first direct voltage, the second output 10 ground connection of described rectifier bridge D7, described the 7th capacitor C 1 is connected between the first output 9 and the second output 10 of described rectifier bridge D7.
The embodiment of the present invention also provides a kind of light fixture, comprises above-mentioned constant-current voltage-stabilizing drive circuit and LED light source (not shown).Described LED light source is connected between described the first output OUT1 and described the second output OUT2.
The constant-current voltage-stabilizing drive circuit of the embodiment of the present invention the second execution mode and the concrete principle of LED light source are:
The starting of oscillation of described constant-current voltage-stabilizing drive circuit: described extraneous electric main provides described the first direct voltage through described current rectifying and wave filtering circuit, described the first direct voltage is through described the first resistance R 1 and the second resistance R 2, give described the first switching tube Q1 power supply, and through described the 3rd resistance R 3 ground connection, thereby make described the first switching tube Q1 conducting.
In the time of described the first switching tube Q1 conducting, the electric current of the described primary coil N1 of described transformer T is linear to be increased, and energy storage is in described primary coil N1.On the ancillary coil N3 of described transformer T, just producing Same Name of Ends 6, the induced electromotive force that different name end 5 is negative, thus bias voltage is provided to first end and second end of the detector of described optical coupler IC1 through described the first voltage-stabiliser tube ZD1 and the 6th resistance R 6.
Closing of described constant-current voltage-stabilizing drive circuit: when the electric current of described primary coil N1 is increased to after a certain size, the bias voltage of described the 3rd resistance R 3 injects base current to described second switch pipe Q2, thereby make described second switch pipe Q2 conducting, reduce the voltage of described the first switching tube Q1, described the first switching tube Q1 ends gradually, and the electric current of described primary coil N1 reduces thereupon gradually.According to the character of transformer T, the upper generation of ancillary coil N3 Same Name of Ends 6 is negative, the induced electromotive force that different name end 5 is positive, and power to the collector electrode of described the 3rd switching tube Q3 through described the 20 resistance R 20 and described the second diode D2, make described the 3rd switching tube Q3 conducting, described second switch pipe Q2 and described the 3rd switching tube Q3 form latching circuit, thereby accelerate described the first switching tube Q1 electric discharge, and then accelerate the cut-off of described the first switching tube Q1, to reduce the loss of described the first switching tube Q1.
In the time that the electric current of described primary coil N1 reduces thereupon gradually, the energy of described transformer T discharges to described secondary coil N2 gradually, described the first diode D1 conducting, thus described the first capacitor C 1, the 9th capacitor C 9 and inductance L 1 are charged, and described indicator light LED1 starts luminous.
After the energy that the primary coil N1 of described transformer T stores discharges completely, the induced electromotive force on described ancillary coil disappears, and described second switch pipe Q2 and the 3rd switching tube Q3 all end.Described constant-current voltage-stabilizing drive circuit starts second circulation, i.e. described constant-current voltage-stabilizing drive circuit starting of oscillation again.In second circulation, because described the first capacitor C 1, described the 9th capacitor C 9 and described inductance L 1 are given described indicator light LED1 power supply, described indicator light LED1 continues luminous.
In described second circulation, described constant-current voltage-stabilizing drive circuit is again when starting of oscillation, and the first end of the detector of described optical coupler IC1 and the second end have bias voltage.In the time of described the first output OUT1 and described the second output OUT2 zero load, no current feedback.Described the second direct voltage is input to the inverting input of described voltage comparator U1 after described the 8th resistance R 8 and described the 9th resistance R 9 dividing potential drops, described the second direct voltage also provides accurate reference voltage through described the tenth resistance R 10 and voltage stabilizing chip U3, to be input to the in-phase input end of described voltage comparator U1.When the voltage separating through described the 8th resistance R 8 and described the 9th resistance R 9 is during higher than described reference voltage, described voltage comparator U1 overturns and is output as negative, described optical coupler IC1 conducting, thereby inject base current through described the first voltage-stabiliser tube ZD1 and the 6th resistance R 6 at described second switch pipe Q2, accelerate described second switch pipe Q2 conducting, and then described the first switching tube Q1 is ended in advance, finally make described second direct voltage of described constant-current voltage-stabilizing drive circuit stable output.
In described second circulation, when described constant-current voltage-stabilizing drive circuit cuts out again, the first end of the detector of described optical coupler IC1 and the second end are without bias voltage, and no-voltage feeds back.
In described second circulation, described constant-current voltage-stabilizing drive circuit is again when starting of oscillation, and the first end of the detector of described optical coupler IC1 and the second end have bias voltage.In the time that described the first output OUT1 and described the second output OUT2 band carry, described load current along with the electric current of described primary coil N1 reduce and and reduce, described the 7th resistance R 7 provides voltage to described current comparator U2.In the time that described load current is bigger than normal, described current comparator U2 overturns and is output as negative, described optical coupler IC1 conducting, thereby inject base current through described the first voltage-stabiliser tube ZD1 and the 6th resistance R 6 at described second switch pipe Q2, accelerate described second switch pipe Q2 conducting, and then described the first switching tube Q1 is ended in advance, finally make the described load current of described constant-current voltage-stabilizing drive circuit stable output.
A kind of constant-current voltage-stabilizing drive circuit described in the embodiment of the present invention does not adopt pwm chip, and cost is lower.Described constant-current voltage-stabilizing drive circuit is mainly by its internal resistance, and primary coil N1, the secondary coil N2 of electric capacity and transformer T and ancillary coil N3 produce signal, and its frequency variation, stability is strong, reliability is high, volume is small and exquisite, and function is simple.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (10)
1. a constant-current voltage-stabilizing drive circuit, it is characterized in that, comprise current rectifying and wave filtering circuit, the first resistance, the second resistance, the 3rd resistance, the first switching tube, second switch pipe, transformer, the first diode and the first electric capacity, described current rectifying and wave filtering circuit connects extraneous electric main, to convert extraneous electric main to first direct voltage, the first end of described the first resistance is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first resistance is connected in the control end of described the first switching tube through described the second resistance, the first end of described the first switching tube connects the Same Name of Ends of the primary coil of described transformer, the different name end of the primary coil of described transformer is connected to described current rectifying and wave filtering circuit to receive described the first direct voltage, the second end of described the first switching tube is connected to the control end of second switch pipe, and through described the 3rd grounding through resistance, the first end of described second switch pipe is connected to described the first direct voltage by described the first resistance, the second end ground connection of described second switch pipe, the Same Name of Ends of the secondary coil of described transformer connects the anode of described the first diode, the negative electrode of described the first diode connects the anode of described the first electric capacity, the negative electrode of described the first electric capacity connects different name end the ground connection of the secondary coil of described transformer, the anode of described the first electric capacity is as the first output of described constant-current voltage-stabilizing drive circuit, the negative electrode of described the first electric capacity is as the second output of described constant-current voltage-stabilizing drive circuit, described the first electric capacity is for energy storage, when described the first direct voltage is given described the first switching tube power supply through described the first resistance, described the first switching tube conducting, the primary coil of described transformer is through described the first switching tube and described the 3rd grounding through resistance, thereby the primary coil storage power of described transformer, described the 3rd resistance provides dividing potential drop to power to the control end of described second switch pipe, make the conducting of described second switch pipe, reduce the control end voltage of described the first switching tube, thereby make described the first switching tube cut-off, the primary coil of described transformer progressively releases energy in the secondary coil of described transformer, the secondary coil of described transformer is through described the first diode and described the first capacitor charging, and at the first output of described constant-current voltage-stabilizing drive circuit and electric current and the voltage of the second output stable output.
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 comprises the second electric capacity, the 4th resistance and the 5th resistance, for the second direct voltage at described the first output and described the second output stable output, after described the second electric capacity is connected with the 4th resistance, be parallel to the two ends of described the first diode, described the second electric capacity and the 4th resistance composition RC peak absorbing circuit, described the 5th resistance is connected between the negative electrode of described the first diode and the different name end of the secondary coil of described transformer.
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 comprises the ancillary coil of described transformer, the 3rd electric capacity, the second diode, the 3rd switching tube, the first voltage-stabiliser tube, described in the 6th resistance and the 3rd diode, the Same Name of Ends of ancillary coil is through described the 3rd capacity earth, the Same Name of Ends of described ancillary coil is also connected the control end of described second switch pipe with described the 6th resistance through described the first voltage-stabiliser tube, described the 3rd diode is connected between the different name end and ground of described ancillary coil, the different name end of described ancillary coil connects the anode that also connects described the second diode, the negative electrode of described the second diode connects the first end of described the 3rd switching tube, the control end of described the 3rd switching tube connects the first end of described second switch pipe, the second end of described the 3rd switching tube connects the control end of described second switch pipe, in the time that the primary coil of described transformer releases energy secondary coil in described transformer, described ancillary coil produces inverse electromotive force, it is the electromotive force that the electromotive force of the Same Name of Ends of described ancillary coil is less than described ancillary coil different name end, make described the 3rd switching tube conducting to described the 3rd switching tube power supply, described second switch pipe and described the 3rd switching tube form self-locking circuit, and then accelerate described the first switching tube and end, electric current is successively through the Same Name of Ends of described ancillary coil, described the second diode, the 3rd switching tube, the 6th resistance, thereby the first voltage-stabiliser tube is got back to the different name end of described ancillary coil and is formed 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 comprises the 7th resistance and optical coupler, described the 5th resistance is connected in the Same Name of Ends of the secondary coil of described transformer through described the 7th resistance, described the 7th resistance is for current sample, the first end of the detector of described optical coupler connects the negative electrode of described the first voltage-stabiliser tube, and the second end of the detector of described optical coupler connects the control end of described second switch pipe.
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 comprises voltage feedback circuit, described voltage feedback circuit comprises voltage comparator, voltage stabilizing chip, the 8th resistance, the 9th resistance, the tenth resistance, the 4th electric capacity, the 11 resistance, the 4th diode and the 12 resistance, described the second direct voltage connect described the 8th resistance and described the 9th resistance ground connection, provide a point inverting input that is pressed on described voltage comparator with the tie point place between described the 8th resistance and described the 9th resistance, described the second direct voltage also connect described the tenth resistance and described voltage stabilizing chip ground connection, to provide a point in-phase input end that is pressed on described voltage comparator at the tie point place of described the tenth resistance and described voltage stabilizing chip, the negative electrode of described voltage stabilizing chip connects one end of described the tenth resistance, the plus earth of described voltage stabilizing chip, the reference utmost point of described voltage stabilizing chip is connected in the negative electrode of described voltage stabilizing chip, after described the 4th resistance and described the 11 resistance series connection, be connected in parallel between the inverting input of described voltage comparator and the output of described voltage comparator, described the 4th resistance and described the 11 resistance are for frequency compensation, the output of described voltage comparator is connected in the negative electrode of photophore of described optical coupler with antireflux through described the 4th diode, described the second direct voltage also through described the 12 resistance be connected in described optical coupler photophore anode with power supply.
6. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 5, it is characterized in that, described constant-current voltage-stabilizing drive circuit also comprises current feedback circuit, described current feedback circuit comprises the 13 resistance, the 14 resistance, the 15 resistance, the 5th electric capacity, the 16 resistance, current comparator and the 5th diode, described the 13 resistance is connected between described the 7th first end of resistance and the inverting input of described current comparator, described the 14 resistance is connected between second end and the in-phase input end of described current comparator of described the 7th resistance, described the 7th resistance two ends provide the two ends of voltage to described current comparator, described the 15 resistance is connected between the in-phase input end of described current comparator and the negative electrode of described voltage stabilizing chip, after described the 5th electric capacity and described the 16 resistance series connection, be connected in parallel between the in-phase input end of described current comparator and the output of described voltage comparator, described the 5th electric capacity and described the 16 resistance are for frequency compensation, the output of described current comparator connects the negative electrode of photophore of described optical coupler with antireflux through described the 5th diode.
7. a kind of constant-current voltage-stabilizing drive circuit as claimed in claim 2, it is characterized in that, described the first switching tube is NMOS pipe, described the first control end opening the light is grid, described the first first end opening the light and the second end are respectively drain electrode 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, the first end of described second switch pipe and the 3rd switching tube is collector electrode, and the second end of described second switch pipe and the 3rd open pipe is emitter.
8. 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 comprises the 17 resistance, the 6th electric capacity and the 6th diode, the first end of described the 17 resistance is connected in the different name end of the described primary coil of described transformer, the second end of described the 17 resistance connects the negative electrode of described the 6th diode, the Same Name of Ends of the described primary coil of transformer described in the anodic bonding of described the 6th diode, described the 6th electric capacity is in parallel with described the 17 resistance, described the 17 resistance, the 6th electric capacity and the 6th diode are used for forming RCD peak absorbing circuit.
9. 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 comprises 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, the second input of described rectifier bridge connects the zero line of described extraneous electric main, the first output of described rectifier bridge is exported described the first direct voltage, the second output head grounding of described rectifier bridge, described the 7th electric capacity is connected between first output and the second output of described rectifier bridge.
10. a light fixture, is characterized in that, comprises a kind of constant-current voltage-stabilizing drive circuit and LED light source described in claim 1 ~ 9 any one.
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| CN201210501404.XA CN103857109B (en) | 2012-11-30 | 2012-11-30 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
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| CN201210501404.XA CN103857109B (en) | 2012-11-30 | 2012-11-30 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
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| CN103857109A true CN103857109A (en) | 2014-06-11 |
| CN103857109B CN103857109B (en) | 2016-06-29 |
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| CN112399660A (en) * | 2019-08-16 | 2021-02-23 | 上海苏萨电子科技有限公司 | Drive 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103857109B (en) | 2016-06-29 |
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