CN101472375A - High-frequency constant current source converter of neon - Google Patents
High-frequency constant current source converter of neon Download PDFInfo
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- CN101472375A CN101472375A CNA2007100946155A CN200710094615A CN101472375A CN 101472375 A CN101472375 A CN 101472375A CN A2007100946155 A CNA2007100946155 A CN A2007100946155A CN 200710094615 A CN200710094615 A CN 200710094615A CN 101472375 A CN101472375 A CN 101472375A
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Abstract
The invention discloses a converter with a high-frequency and constant current power supply of a neon light, which comprises a leakage transformer and at least one constant current inductor, wherein, the constant current inductor is connected in series in a supply circuit of the converter with the high-frequency and constant current power supply of the neon light so as to ensure constant current feeding in a current feeding manner. Because the invention utilizes the current feeding, the power supply source of the converter has higher dynamic impedance (approximate constant current), so that instant overvoltage and overcurrent caused by abnormal interference of starting the converter or outputting an open circuit and inputting or outputting of the switch tube is prohibited in a real time manner, the reliability of the converter is effectively enhanced, and the service life of the converter is prolonged.
Description
Technical field
The present invention relates to a kind of neon lamp power source converter, be specifically related to a kind of high-frequency constant current source converter of neon.
Background technology
Neon lamp power source converter commonly used is owing to adopt voltage feed dual transformer topological structure (being the voltage fed structure), when converter at startup or output open circuit and input or output when being subjected to disturbing unusually, this class formation can't be placed restrictions on the instantaneous overvoltage of switching tube and overcurrent and can be caused the inefficacy of converter.The running frequency of this type of reconfiguration device is difficult for setting, and is output as square type wave voltage driving neon light tube, and this can produce the radio-frequency electromagnetic that is caused by high order harmonic component and disturb (RFI), and there is following shortcoming in this class formation:
1, power output is low, makes neon light tube brightness dark partially;
2, constant-current characteristics is poor, brightness irregularities when driving the neon light tube of different length;
3, electromagnetic interference is bigger than normal, the electronic equipment around disturbing;
4, the protective circuit reliability is low.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high-frequency constant current source converter of neon, and it has protected the electronic device of neon light converter, has improved the reliability of neon light converter, has prolonged the useful life of converter and neon light tube.
In order to solve above technical problem, the invention provides a kind of high-frequency constant current source converter of neon, comprise leakage transformer, also comprise at least one constant current inductance, this constant current inductance is connected in the current supply circuit of high-frequency constant current source converter of neon, with the mode constant current power supply of current feed.
Because the present invention's current feed, can make the power supply of converter have very high motional impedance (approximate constant-current source), real-time prevention switching tube is at converter startup or output open circuit and input or output instantaneous overvoltage and the overcurrent that is subjected to unusual the interference and causes, effectively improve the reliability of converter, prolonged the useful life of neon light.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is typical push-pull topology structural representation;
Fig. 2 is typical half-bridge topology schematic diagram;
Fig. 3 recommends the topological structure schematic diagram for current feed of the present invention;
Fig. 4 is a current feed half-bridge topology schematic diagram of the present invention;
Fig. 5 is an auto-excitation type current feed parallel resonance push-pull topology structural representation of the present invention;
Fig. 6 is an auto-excitation type current feed parallel resonance half-bridge topology schematic diagram of the present invention;
Fig. 7 is a separated exciting current feed parallel resonance push-pull topology structural representation of the present invention;
Fig. 8 is a separated exciting current feed parallel resonance half-bridge topology schematic diagram of the present invention;
Fig. 9 is a kind of structure of leakage transformer of the present invention.
Embodiment
Neon lamp power source converter of the present invention can adopt push-pull topology structure or half-bridge topology, be the schematic diagram of typical push-pull topology structure as shown in Figure 1, the primary coil T1-2 of leakage transformer has centre cap, this centre cap is connected with DC power supply VCC, the two ends of primary coil T1-2 are connected in respectively in the drain electrode of recommending switch Q1 and Q2, recommend the source grounding of switch Q1 and Q2.Be the structural representation of typical half-bridge topology as shown in Figure 2, the drain electrode of half-bridge switch Q1 meets DC power supply VCC, its source electrode is connected with the drain electrode of half-bridge switch Q2, the source ground of half-bridge switch Q2, the capacitor C 2 and C3 one termination power of series connection, other end ground connection, the primary coil T1-2 one of leakage transformer terminates at the source electrode of half-bridge switch Q1, and the other end is connected on the link of capacitor C 2 and C3.
Be the schematic diagram of series connection constant current inductance in the push-pull topology structure of Fig. 1 as shown in Figure 3, constant current inductance L1 is connected in the main circuit power supply of push-pull topology structure.
Be the schematic diagram of series connection constant current inductance in the half-bridge topology of Fig. 2 as shown in Figure 4, this structure comprises two constant current inductance L1, L2, is connected on the two ends of the current supply circuit of half-bridge topology respectively.All can adopt auto-excitation type or the vibration of separated exciting drive circuit for push-pull topology structure of the present invention or half-bridge topology.
Behind the neon lamp high-frequency supply convertor series connection constant current inductance of the present invention, also the two ends of the circuit part that need connect with the constant current inductance in a current supply circuit high pressure in parallel absorbs circuit, is used to absorb the high pressure back-emf that the constant current inductance produces.
Neon lamp high-frequency supply convertor of the present invention can also have a parallel resonance electric capacity, this resonant capacitance is connected in parallel on the two ends of the primary coil T1-2 of leakage transformer, the distributed capacitance of the primary coil of leakage transformer, the load capacitance of secondary coil are converted electric capacity, and the total capacitance in parallel of resonant capacitance of its outprimary, constitute parallel resonance with the primary coil T1-2 of leakage transformer, resonance frequency is:
In the above-mentioned formula, f is a resonance frequency, and L is the inductance value of primary coil, and C is that the load capacitance of distributed capacitance, the secondary coil of the primary coil of leakage transformer is converted the electric capacity of its outprimary, and the total capacitance in parallel of resonant capacitance.
The neon lamp high-frequency supply convertor that has resonant capacitance can adopt push-pull topology structure or half-bridge topology, can adopt auto-excitation type or separated exciting to produce vibration.
Neon lamp power source converter of the present invention, the structure of its leakage transformer can adopt the structure of Fig. 9, comprise two " E " font FERRITE CORE, the peristome of two " E " font FERRITE CORE is involutory, form " saying " font FERRITE CORE, on the center pillar of " saying " font FERRITE CORE, be wound with primary coil T1-2 and secondary coil T1-2 respectively, between the center pillar of " saying " font FERRITE CORE and two side columns, and the window that is arranged between primary coil T1-2 and secondary coil T1-2 is provided with two ferrite leakage field sheets respectively.
Ferrite leakage field sheet can be fixed on any one side of window with glue; Also can " mouth " font FERRITE CORE a support is set between side column up and down, ferrite leakage field sheet is fixed on the support with glue; Perhaps also can directly use down side column or about two coils ferrite leakage field sheet is fixedly clamped.Its length of ferrite leakage field sheet and width dimensions can change, and the magnetic flux of the magnetic-leakage shunt of its formation of ferrite leakage field sheet of different size varies in size.
Two side column apposition positions that the center pillar of two " E " font FERRITE CORE of leakage transformer is shorter than two " E " font FERRITE CORE of the side column of two equal lengths or leakage transformer are lined with the non-magnet material of equivalent respectively, make to form magnetic flux imbalance and the saturated air gap that causes converter to lose efficacy of magnetic core that prevents because of transformer in the center pillar of " saying " font FERRITE CORE.
Primary coil T1-2 one side of " saying " center pillar of font FERRITE CORE also is wound with at least one feedback winding T1-3, T1-4, and this class formation is used for self-maintained circuit, T1-3 as shown in Figure 5 and the T1-3 shown in Fig. 6, T1-4.
Fig. 5 is the embodiment of auto-excitation type current feed parallel resonance push-pull configuration of the present invention, this structure absorbs circuit by high pressure, biasing circuit, current feed constant current inductance L1, resonant capacitance C1, leakage transformer T1 (containing centre tapped elementary winding T1-1, secondary winding T1-2 and feedback winding T1-3) and recommend switching tube Q1 and Q2 composition.
Dc power anode VCC connects the end of L1, and another termination high pressure of L1 absorbs circuit and T1-1 center head, and high pressure absorbs the other end ground connection of circuit.The T1-3 two ends connect the grid of Q1 and Q2 respectively, and biasing circuit connects the grid (connecing the grid of Q1 among Fig. 8) of Q1 or Q2, the source electrode of Q1 and Q2 connect dc power cathode ().C1 is connected in parallel on the two ends of T1-1, and the upper end of T1-1 is connected with the drain electrode of Q1, and the lower end is connected with the drain electrode of Q2, and the T1-2 two ends are output.
In foregoing circuit: DC power supply VCC powers for recommending the major loop constant current through L1; C1, load capacitance are converted the total capacitance in parallel of distributed capacitance of electric capacity, the primary coil of transformer end, and with the primary coil T1-1 formation in parallel parallel resonance of leakage transformer, resonance frequency is:
Biasing circuit is that Q1 and Q2 are provided with quiescent point, and feedback winding T1-3 drives by Q1, Q2, the push-pull circuit self-oscillation that T1 constitutes; High pressure absorbs circuit and absorb the high pressure back-emf that is produced by switching current on L1; The secondary T1-2 constant current output of leakage transformer, this structure is output as sine voltage and sine-wave current.
Fig. 6 is the embodiment of auto-excitation type current feed parallel resonance half-bridge topology of the present invention, this structure absorbs circuit by high pressure, biasing circuit, current feed constant current inductance L1-1 and L1-2, resonant capacitance C1, leakage transformer T1 (containing elementary winding T1-1, secondary winding T1-2 and feedback winding T1-3 and T1-4) and half-bridge structure switching tube Q1 form with C3 with Q2 and capacitor C 2.
Dc power anode VCC one tunnel absorbs circuit and L2 ground connection through L1, the high pressure of polyphone; Another road is through the C2 and the C3 ground connection of polyphone.The drain electrode of Q1 connects the link of L1 and high pressure absorption circuit, and the source electrode of Q1 is connected with the drain electrode of Q2, and the source electrode of Q2 connects the link of L2 and high pressure absorption circuit.Biasing circuit connects with the grid of Q1 and Q2 respectively, and the end of T1-3 and T1-4 is connected with biasing circuit, and the other end is connected with the source electrode of Q1, Q2 respectively.The termination C2 of T1-1 and the link of C3, the link of another termination Q2 and Q3.C1 is connected in parallel on the two ends of T1-1, and the T1-2 two ends are output.
In the foregoing circuit: DC power supply VCC is half-bridge major loop constant current power supply through L1-1 and L1-2; C1, load capacitance convert that the elementary T1-1 of the total capacitance in parallel of distributed capacitance of electric capacity, primary coil of transformer end and leakage transformer is in parallel to constitute parallel resonance, and resonance frequency is:
Biasing circuit is that Q1 and Q2 are provided with quiescent point, and feedback winding T1-3 and T1-4 drive by Q1, Q2, C2, C3, the half-bridge topology self-oscillation that T1 constitutes; High pressure absorbs circuit and absorb the high pressure back-emf that is produced by switching current on L1-1 and L1-2; The secondary T1-2 constant current output of leakage transformer is output as sine voltage and sine-wave current, because half-bridge structure, withstand voltage (BVds) of switching tube can reduce.
Fig. 7 is the embodiment of separated exciting current feed parallel resonance push-pull topology structure of the present invention, this structure absorbs circuit by high pressure, drive circuit, current feed constant current inductance L1, resonant capacitance C1, leakage transformer T1 (containing centre tapped elementary winding T1-1, secondary winding T1-2) and recommend switching tube Q1 and Q2 forms.
Dc power anode VCC connects the end of L1, and another termination high pressure of L1 absorbs an end and the T1-1 center head of circuit, and high pressure absorbs the other end ground connection of circuit.Drive circuit is connected with the grid of Q1 and Q2, the source electrode of Q1 and Q2 connect dc power cathode ().The drain electrode of the last termination Q1 of T1-1, the drain electrode of the following termination Q2 of T1-1, C1 is connected in parallel on the two ends of T1-1, and the T1-2 two ends are output.
In the foregoing circuit: DC power supply VCC powers for recommending the major loop constant current through L1; C1, load capacitance convert that the elementary T1-1 of the total capacitance in parallel of distributed capacitance of electric capacity, primary coil of transformer end and leakage transformer is in parallel to constitute parallel resonance, and resonance frequency is:
Drive circuit drives by Q1, Q2, the push-pull topology structure self-oscillation that T1 constitutes; High pressure absorbs circuit and absorb the high pressure back-emf that is produced by switching current on L1; The secondary T1-2 constant current output of leakage transformer is output as quasi-sine-wave voltage and quasi-sine-wave electric current.
Fig. 8 is the embodiment of separated exciting current feed parallel resonance half-bridge topology of the present invention, this structure absorbs circuit by high pressure, drive circuit, current feed constant current inductance L1-1 and L1-2, resonant capacitance C1, leakage transformer T1 (contain elementary winding T1-1, secondary winding T1-2) and half-bridge structure switching tube Q1 and Q2 and capacitor C 2 and C3 composition.
Dc power anode VCC one tunnel absorbs circuit and L2 ground connection through L1, the high pressure of polyphone; Another road is through the C2 and the C3 ground connection of polyphone.The drain electrode of Q1 connects the link of L1 and high pressure absorption circuit, and the source electrode of Q1 is connected with the drain electrode of Q2, and the source electrode of Q2 connects the link of L2 and high pressure absorption circuit.Drive circuit is connected with the grid of Q1 and Q2, the termination C2 of T1-1 and the link of C3, the link of another termination Q2 and Q3.C1 is connected in parallel on the two ends of T1-1, and the T1-2 two ends are output.
In the foregoing circuit: DC power supply VCC is half-bridge major loop constant current power supply through L1-1 and L1-2; C1, load capacitance convert that the elementary T1-1 of the total capacitance in parallel of distributed capacitance of electric capacity, primary coil of transformer end and leakage transformer is in parallel to constitute parallel resonance, and resonance frequency is:
Drive circuit drives by Q1, Q2, C2, C3, the half-bridge topology self-oscillation that T1 constitutes; High pressure absorbs circuit and absorb the high pressure back-emf that is produced by switching current on L1-1 and L1-2; The secondary T1-2 constant current output of leakage transformer is output as quasi-sine-wave voltage and quasi-sine-wave electric current, because half-bridge structure, the withstand voltage of switching tube reduces.
In sum, neon lamp high-frequency supply convertor commonly used all adopts voltage feed topological structure (being the voltage fed structure), when converter at startup or output open circuit and input or output when being subjected to disturbing unusually, this class formation can't be placed restrictions on the instantaneous overvoltage of switching tube and overcurrent and can be caused the inefficacy of converter.The present invention increases the constant current inductance and adopts current feed topological structure (being the current source supply structure), can make the power supply of converter have very high motional impedance (approximate constant-current source), its effect is: prevention switching tube that can be real-time is at converter startup or output open circuit and input or output instantaneous overvoltage and the overcurrent that is subjected to unusual the interference and causes, and has improved the reliability of converter greatly; Can eliminate switching tube when turn-on and turn-off current spike and realize zero voltage switch (ZVS), reduced the power consumption of switching tube, improved reliability; Can place restrictions on the asymmetric of drive current, thereby prevent to lose efficacy because of the magnetic flux imbalance and the saturated converter that causes of magnetic core of output transformer.
Neon lamp high-frequency supply convertor commonly used adopts the dual transformer structure, and the running frequency of this type of reconfiguration device is difficult for setting, and is output as square type wave voltage and drives neon light tube, and this can produce the radio-frequency electromagnetic that is caused by high order harmonic component and disturb.The present invention adopts the parallel resonance structure, and its effect is:
(1) running frequency of converter is:
In the formula: the primary electrical sensibility reciprocal of L-output transformer, C-resonant capacitance, distributed capacitance and convert the load capacitance of primary.
(2) to the auto-excitation type structure, switching tube is driven by the secondary sine voltage that provides of output transformer, has reduced the voltage stress (dv/dt) when switching tube turn-offs, and has improved reliability, and switching tube is conducting and shutoff when voltage zero-cross, has reduced the power consumption of switching tube; To the separated exciting structure, by the zero voltage switch effect of current feed, switching tube conducting and shutoff when voltage zero-cross equally reduced the power consumption of switching tube.
(4) to the auto-excitation type structure, be output as sine voltage and drive neon light tube, lamp current also is sinusoidal wave; To the separated exciting structure, be output as quasi-sine-wave driven neon light tube, lamp current also is a quasi-sine-wave.Drive neon light tube with this type of wave mode, can improve lighting tube brightness, prolonging lamp tube service life.And reduce by the radiation-induced radio-frequency electromagnetic of high order harmonic component and disturb.
(5) output transformer is set in operation under the unsaturated state, has reduced the temperature rise of transformer, has improved reliability.
Leakage transformer of the present invention in addition adopts " saying " font FERRITE CORE (E E type) by primary coil (containing the feedback winding) and secondary coil, FERRITE CORE and ferrite leakage field sheet constitute, and its architectural characteristic has following effect: can provide the starting resistor that is higher than 1.5 times of rating operating voltages to neon light tube; The specified running current of approximately constant can be provided different neon light tubes in the nominal load scope, to the neon light tube load of different length, the running current deviation less than 20%; Can be when the improper overload of user be used, working voltage and electric current can sharply descend, and use the inefficacy that causes because of overload to prevent converter; Have specified secondary short circuited electric current, the secondary short circuited electric current is not more than 20% of specified running current, thereby can stop the converter that is caused by output short-circuit to lose efficacy in real time; The converter using leakage transformer is exported, and adds suitable air gap to prevent magnetic flux imbalance and the saturated converter inefficacy that causes switching tube to damage of magnetic core because of output transformer at magnetic loop.The leakage transformer output of this class formation of converter using, the brightness that its constant-current characteristics can make the neon light tube load of different tube diameters and different length send uniformity, its current limiting characteristic have then improved the reliability of converter.
According to experiment, the 25mA9kV converter made from the technology of the present invention drives the argon-mixed neon light tube of 8m Φ 12mm neon, and power can reach 90W; The 40mA6kV converter made from the technology of the present invention drives Φ 15mm neon neon light tube, and lamp current is 34.3mA during pipe range 6m, and lamp current is 40mA during pipe range 1m, and then constant current performance is: the 34.3/40=0.8575 deviation is less than 20%; Because the present invention adopts the parallel resonance structure, output drives neon light tube with sine voltage, and lamp current also is sinusoidal wave; Improved lighting tube brightness, prolonged lamp tube service life, and reduced by the radiation-induced radio-frequency electromagnetic of high order harmonic component and disturbed; Because the present invention adopts leakage transformer output, can be when the improper overload of user be used, working voltage and electric current can sharply descend, and have prevented that converter from using the inefficacy that causes because of overload, improved reliability.
Claims (9)
1, a kind of high-frequency constant current source converter of neon, comprise leakage transformer, it is characterized in that, also comprise at least one constant current inductance, described constant current inductance is connected in the current supply circuit of described high-frequency constant current source converter of neon, with the mode constant current power supply of current feed.
2, high-frequency constant current source converter of neon as claimed in claim 1, it is characterized in that, described high-frequency constant current source converter of neon is the push-pull topology structure, adopts auto-excitation type or separated exciting to produce vibration, and described constant current inductance is connected in the current supply circuit of described push-pull topology structure.
3, high-frequency constant current source converter of neon as claimed in claim 1, it is characterized in that, described high-frequency constant current source converter of neon is a half-bridge topology, adopt auto-excitation type or separated exciting to produce vibration, described constant current inductance is two, is connected on the two ends of the current supply circuit of described half-bridge topology respectively.
4, high-frequency constant current source converter of neon as claimed in claim 1, it is characterized in that, comprise that also a high pressure absorbs circuit, described high pressure absorbs the two ends that circuit is connected in parallel on the circuit part of connecting with described constant current inductance in the current supply circuit, is used to absorb the high pressure back-emf that described constant current inductance produces.
5, high-frequency constant current source converter of neon as claimed in claim 1, it is characterized in that, also comprise a resonant capacitance, described resonant capacitance is connected in parallel on the primary coil two ends of described leakage transformer, the distributed capacitance of the primary coil of described leakage transformer, the load capacitance of secondary coil are converted electric capacity, and the total capacitance in parallel of described resonant capacitance of its outprimary, constitute parallel resonance with the primary coil of described leakage transformer, resonance frequency is:
Wherein, f is described resonance frequency, and L is the inductance value of primary coil, and C is that the load capacitance of distributed capacitance, the secondary coil of the primary coil of described leakage transformer is converted the electric capacity of its outprimary, and the total capacitance in parallel of described resonant capacitance.
6, high-frequency constant current source converter of neon as claimed in claim 5 is characterized in that, described high-frequency constant current source converter of neon is push-pull topology structure or half-bridge topology, adopts auto-excitation type or separated exciting to produce vibration.
7, as claim 1 or 5 described high-frequency constant current source converter of neon, it is characterized in that, described leakage transformer comprises two " E " font FERRITE CORE, the peristome of described two " E " font FERRITE CORE is involutory, form " saying " font FERRITE CORE, on " saying " center pillar of font FERRITE CORE, this is wound with primary coil and secondary coil respectively, between the center pillar of described " saying " font FERRITE CORE and two side columns, and the window that is arranged between described primary coil and described secondary coil is provided with two ferrite leakage field sheets respectively.
8, high-frequency constant current source converter of neon as claimed in claim 7, it is characterized in that, the center pillar of two " E " font FERRITE CORE of described leakage transformer is shorter than the side column of two equal lengths or is encased inside the non-magnet material of equivalent respectively at two side column apposition positions of two " E " font FERRITE CORE of described leakage transformer, makes involutory back form in the center pillar of described " saying " font FERRITE CORE to prevent magnetic flux imbalance and the saturated air gap that causes transformer to lose efficacy of magnetic core because of transformer.
9, high-frequency constant current source converter of neon as claimed in claim 7 is characterized in that, primary coil one side of the center pillar of described " saying " font FERRITE CORE also is wound with at least one feedback winding, is used for self-maintained circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100946155A CN101472375A (en) | 2007-12-24 | 2007-12-24 | High-frequency constant current source converter of neon |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100946155A CN101472375A (en) | 2007-12-24 | 2007-12-24 | High-frequency constant current source converter of neon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093894A (en) * | 2016-02-17 | 2017-08-25 | 中国科学院声学研究所 | A kind of constant current constant voltage conversion equipment under water suitable for seabed constant-current supply system |
| CN107257193A (en) * | 2017-07-19 | 2017-10-17 | 深圳市华星光电半导体显示技术有限公司 | A kind of current foldback circuit and liquid crystal display |
-
2007
- 2007-12-24 CN CNA2007100946155A patent/CN101472375A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093894A (en) * | 2016-02-17 | 2017-08-25 | 中国科学院声学研究所 | A kind of constant current constant voltage conversion equipment under water suitable for seabed constant-current supply system |
| CN107257193A (en) * | 2017-07-19 | 2017-10-17 | 深圳市华星光电半导体显示技术有限公司 | A kind of current foldback circuit and liquid crystal display |
| CN107257193B (en) * | 2017-07-19 | 2019-05-03 | 深圳市华星光电半导体显示技术有限公司 | A kind of current foldback circuit and liquid crystal display |
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