CN201038013Y - Electric power unit and display device - Google Patents
Electric power unit and display device Download PDFInfo
- Publication number
- CN201038013Y CN201038013Y CNU2007201429043U CN200720142904U CN201038013Y CN 201038013 Y CN201038013 Y CN 201038013Y CN U2007201429043 U CNU2007201429043 U CN U2007201429043U CN 200720142904 U CN200720142904 U CN 200720142904U CN 201038013 Y CN201038013 Y CN 201038013Y
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- secondary winding
- stray
- transformer
- voltage
- supply unit
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- 238000004804 winding Methods 0.000 claims abstract description 98
- 238000004020 luminiscence type Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 35
- 238000010586 diagram Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 102220279244 rs1555053901 Human genes 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
- H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage
- H05B41/2827—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model relates to a power-supply apparatus in the area of electric appliances, which is suitable for the voltage-signal output of a driven lamp tube, and comprises a high magnetic-leakage transformer. The like terminal of a first-auxiliary edged winding and the unlike terminal of a second-auxiliary edged winding are the voltage-output terminals of the power-supply apparatus to output the voltage signal of the driven lamp tube, and the utility model also discloses a display apparatus besides the power-supply apparatus. The power supply adopted by the utility model can make the both ends of the driven lamp tube with equal voltage and luminance, and can ensure the even luminescence of the driven lamp tube.
Description
Technical field
The utility model relates to appliance field, relates in particular to a kind of display unit that is used to drive the supply unit of lamp works and comprises this supply unit in the electrical equipment.
Background technology
At present, usually adopt two stray transformers that a secondary winding respectively arranged or stray transformer that two secondary windings are arranged driving power as fluorescent tube (Lamp), though the number difference of the stray transformer that uses in the driving power, but the secondary winding number of stray transformer is identical, is two.
Figure 1 shows that a kind of power supply that is used to drive fluorescent tube, this power supply comprises: stray transformer T1, stray transformer T2, resistance R 1 and resistance R 2, capacitor C 1 and C2, the former limit winding of stray transformer T1 and T2 connects the voltage output end of inverter respectively, the end of the same name of one termination stray transformer T1 of capacitor C 1, one end of another termination capacitor C 2 of capacitor C 1, the different name end of another termination stray transformer T2 of capacitor C 2, the different name end of the end of the same name of stray transformer T1 secondary winding and stray transformer T2 secondary winding is as the voltage signal output end of this supply unit, this voltage signal output end output is used to drive the voltage signal of lamp works, ground connection behind the different name end series resistor R1 of stray transformer T1 secondary winding, ground connection behind the end series resistor R2 of the same name of stray transformer T2 secondary winding.Wherein, the resistance of resistance R 1 and R2 is generally very little, when driving power is worked, voltage drop on resistance R 1 and the R2 is much smaller than the output voltage of stray transformer, so the voltage drop of resistance R 1, the last generation of R2 can be ignored, and according to Ohm's law as can be known the voltage signal on resistance R 1, the R2 reflected the size of current in the fluorescent tube.
Because during lamp works, lamp tube ends can produce direct-to-ground capacitance, the transmission line that connects fluorescent tube and stray transformer also can produce direct-to-ground capacitance, and the direct-to-ground capacitance that meeting of the leakage inductance of stray transformer and lamp tube ends produce, resonance takes place in direct-to-ground capacitance that transmission line produces and capacitor C 1 and C2, thereby influence the voltage of lamp tube ends, the leakage inductance of two secondary windings of stray transformer can cause the lamp tube ends voltage swing not wait when unequal, make the brightness difference of lamp tube ends, the uniformity of luminance of fluorescent tube is affected, and makes a concrete analysis of as follows:
Figure 2 shows that the circuit topology figure of supply unit shown in Figure 1, V1, V2 represent the output voltage of stray transformer T1, T2 secondary winding, V1=V2; L1 is the leakage inductance of stray transformer T1, and L2 is the leakage inductance of stray transformer T2, the manufactured materials of two stray transformers and technology difference to some extent generally, and therefore, leakage inductance L1 and L2 are unequal; C11, the direct-to-ground capacitance that lamp tube ends produced when C22 was lamp works, direct-to-ground capacitance that transmission line produces and the equivalent capacity of capacitor C 1 and C2, because the direct-to-ground capacitance that transmission line produces size is not exclusively equal, therefore, C11, the C22 size not exclusively equates, for ease of analyzing, supposes C11=C22.Because leakage inductance L1, L2 is very big usually, capacitor C 11, C22 is very little, resistance R 1, and R2 is generally very little, therefore, by V1, L1, C11, first resonant tank that R1 constitutes reach by V2, L2, C22, the quality factor of second resonant tank that R2 constitutes are all very high, when L1 is not equal to L2, the resonance curve of two resonant tanks can be inconsistent, and two resonance curve active section slopes are very big, as shown in Figure 3, at same operating frequency fs, A among Fig. 2, the voltage that B is 2 has the voltage difference of △ V, this voltage difference reaches 1/3 of lamp works voltage sometimes, because A, there is voltage difference in 2 of B, make that lamp tube ends voltage is unequal, and voltage difference is bigger, therefore, the brightness meeting of lamp tube ends is inconsistent, and the end that voltage is high is bright partially, low dark partially of voltage influences the uniformity of lamp luminescence.
The utility model content
This technical problem of wanting utility model to solve provides a kind of supply unit, and when realizing using this power supply as lamp tube power supply, lamp luminescence is even.
For solving the problems of the technologies described above, the purpose of this utility model is achieved through the following technical solutions:
A kind of supply unit comprises: stray transformer;
The different name end of the described first secondary winding is connected with the end of the same name of the described second secondary winding; The different name end of the end of the same name of the described first secondary winding and the described second secondary winding is as described power source voltage output, and output drives the voltage signal of fluorescent tube.
Preferably, above-mentioned power supply also comprises: current transformer;
The different name end of the first secondary winding is connected with the end of the same name of the second secondary winding and is specially:
The different name end of the described first secondary winding is connected to an end of described current transformer primary side, and the other end of described current transformer primary side is connected to the end of the same name of the described second secondary winding.
Preferably, above-mentioned power supply also comprises: electric capacity;
One end of described electric capacity is connected to the high end of voltage to earth in the described voltage output end, the other end ground connection of described electric capacity.
Preferably, the described first secondary winding and the second secondary winding belong to same stray transformer; Perhaps, the described first secondary winding and the second secondary winding belong to two stray transformers respectively.
A kind of display unit comprises: power supply, the cold-cathode fluorescence lamp of many parallel connections;
Described power supply comprises: stray transformer;
The different name end of the described first secondary winding is connected with the end of the same name of the described second secondary winding; The end of the same name of the described first secondary winding is exported the voltage signal that is used to drive described many cold-cathode fluorescence lamp work in parallel with the different name end of the described second secondary winding as described power source voltage output.
Preferably, above-mentioned display unit also comprises: current transformer;
The different name end of the first secondary winding is connected with the end of the same name of the second secondary winding and is specially:
The different name end of the described first secondary winding is connected to an end of described current transformer primary side, and the other end of described current transformer primary side is connected to the end of the same name of the described second secondary winding.
Preferably, above-mentioned display unit also comprises: electric capacity;
One end of described electric capacity is connected to the high end of voltage to earth in the described voltage output end, the other end ground connection of described electric capacity.
Preferably, the described first secondary winding and the second secondary winding belong to same stray transformer; Perhaps, the described first secondary winding and the second secondary winding belong to two stray transformers respectively.
Because the tie point of the first secondary winding and the second secondary winding is earth-free, only there is a resonant circuit in above technical scheme as can be seen in the power supply, so lamp tube ends voltage equates the brightness unanimity of lamp tube ends, the uniformity of assurance lamp luminescence.
Description of drawings
The existing supply unit of Fig. 1 is formed schematic diagram;
The circuit topology figure of the existing supply unit of Fig. 2;
The resonance curve figure of the existing supply unit of Fig. 3;
The supply unit that Fig. 4 the utility model embodiment 1 provides is formed schematic diagram;
The circuit topology figure of the supply unit that Fig. 5 the utility model embodiment 1 provides;
The supply unit that Fig. 6 the utility model embodiment 2 provides is formed schematic diagram;
The supply unit that Fig. 7 the utility model embodiment 3 provides is formed schematic diagram;
The supply unit that Fig. 8 the utility model embodiment 4 provides is formed schematic diagram;
The supply unit that Fig. 9 the utility model embodiment 5 provides is formed schematic diagram;
The display unit that Figure 10 the utility model embodiment 6 provides is formed schematic diagram;
The display unit that Figure 11 the utility model embodiment 7 provides is formed schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
Figure 4 shows that the supply unit composition schematic diagram that the utility model embodiment 1 provides, this power supply comprises: stray transformer T1 and T2, and capacitor C 1 and C2, stray transformer T1 and T2 respectively have a secondary winding;
Wherein, the former limit winding of stray transformer T1 and T2 is respectively applied for the voltage output end that connects inverter, the end of the same name of one termination stray transformer T1 of capacitor C 1, one end of another termination capacitor C 2 of capacitor C 1, the different name end of another termination stray transformer T2 of capacitor C 2, the different name end of stray transformer T1 secondary winding links to each other with the end of the same name of stray transformer T2 secondary winding, the different name end of the end of the same name of stray transformer T1 secondary winding and stray transformer T2 secondary winding is the voltage output end of this supply unit, and this voltage signal output end output is used to drive the voltage signal of lamp works.
The operation principle of the above-mentioned supply unit of following brief analysis.Fig. 5 is the circuit topology figure of supply unit shown in Figure 4, and V1, V2 represent the output voltage of stray transformer T1, T2 secondary winding, V1=V2; L1 is the leakage inductance of stray transformer T1, and L2 is the leakage inductance of stray transformer T2, the manufactured materials of two stray transformers and technology difference to some extent generally, and therefore, leakage inductance L1 and L2 are unequal; C11, the direct-to-ground capacitance that lamp tube ends produced when C22 was lamp works, direct-to-ground capacitance that transmission line produces and the equivalent capacity of capacitor C 1 and C2 not exclusively equate because the direct-to-ground capacitance that transmission line produces is big or small, therefore, and C11, the C22 size is not exclusively equal.Because the different name end of stray transformer T1 secondary winding links to each other with the end of the same name of stray transformer T2 secondary winding in the utility model embodiment 1, therefore, among Fig. 5 only by V1, L1, C11, C22, L2, the resonant circuit that V2 constitutes, and the leakage inductance L1 of stray transformer, L2 is equivalent to an inductance, both differences do not influence A, B two point voltages, the voltage that A point and B are ordered are fully by C11, and the C22 dividing potential drop determines, if C11, C22 is equal substantially, and then 2 current potentials of A, B are also equal substantially, and lamp tube ends voltage equates.Equating of lamp tube ends voltage,, the brightness of lamp tube ends will be consistent, guarantees the uniformity of lamp luminescence.
Embodiment 1 is two supply units that the stray transformer formation of a secondary winding is respectively arranged, Figure 6 shows that the supply unit composition schematic diagram that the utility model embodiment 2 provides, in embodiment 2, adopt the stray transformer T1 that two secondary windings are arranged to constitute supply unit, the distinctive points of this supply unit and 1 generator of embodiment is that two secondary windings belong to same stray transformer in this device.The connected mode and the embodiment 1 of the former and deputy limit winding of the supply unit that embodiment 2 is provided are identical, do not repeat them here.
When the supply unit that provides with the foregoing description goes to drive lamp works, the electric capacity over the ground that lamp tube ends produces is equal substantially, and the direct-to-ground capacitance that is connected to the supply lines of lamp tube ends may be unequal, thereby influence the electric capacity of lamp tube ends, therefore, in order to solve the unequal problem of supply lines direct-to-ground capacitance, the direct-to-ground capacitance that guarantees lamp tube ends is equal substantially, when the direct-to-ground capacitance of supply lines is unequal, can be at the less external building-out capacitor of an end of the direct-to-ground capacitance of supply lines, it is less generally to be used for connecting the direct-to-ground capacitance that the supply lines of the high voltage output end of fluorescent tube and supply unit output voltage to earth produces.
Figure 7 shows that the supply unit composition schematic diagram that the utility model embodiment 3 provides, this supply unit is compared also with the supply unit that embodiment 1 and embodiment 2 provide and is comprised: building-out capacitor CC; Wherein, the high end of output voltage to earth in the voltage output end of the end connection supply unit of building-out capacitor CC, the other end ground connection of building-out capacitor CC, the connected mode of this supply unit Central Plains, secondary winding is identical with embodiment 1 and embodiment 2, do not repeat them here, and two secondary windings among the embodiment 3 can belong to a stray transformer, also can belong to two stray transformers, do not influence the realization of the utility model embodiment.
Figure 8 shows that the supply unit composition schematic diagram that the utility model embodiment 4 provides, this supply unit comprises: stray transformer T1 and T2, and current transformer Is, capacitor C 1 and C2, stray transformer T1 and T2 respectively have a secondary winding;
Wherein, the former limit winding of stray transformer T1 and T2 is respectively applied for the voltage output end that connects inverter, the end of the same name of one termination stray transformer T1 of capacitor C 1, an end of another termination capacitor C 2 of capacitor C 1, the different name end of another termination stray transformer T2 of capacitor C 2; The different name end of one termination stray transformer T1 secondary winding of current transformer Is primary side, the end of the same name of another termination stray transformer T2 secondary winding of current transformer Is primary side, ground connection behind the current transformer Is secondary side series resistor Rs, current transformer Is is used to measure the current value that flows through stray transformer secondary winding; The different name end of the end of the same name of stray transformer T1 secondary winding and stray transformer T2 secondary winding is the voltage output end of this supply unit, and this voltage signal output end output is used to drive the voltage signal of lamp works.
In order to solve the unequal problem of supply lines direct-to-ground capacitance, the direct-to-ground capacitance that guarantees lamp tube ends is equal substantially, can in the supply unit that embodiment 4 provides, further add building-out capacitor CC and obtain the supply unit that the utility model embodiment 5 provides, as shown in Figure 9, the high end of output voltage to earth in the voltage output end of the end connection supply unit of building-out capacitor CC, the other end ground connection of building-out capacitor CC.
In other embodiment of embodiment 4, two secondary windings also can provide the realization that does not influence the utility model embodiment by same stray transformer.
More than be the supply unit embodiment that the utility model embodiment provides, below the concrete display unit that includes above-mentioned supply unit of introducing.
Figure 10 shows that a kind of display unit that the utility model embodiment 6 provides, comprising: supply unit, the cold-cathode fluorescence lamp of many parallel connections (CCFL); Wherein, supply unit comprises: stray transformer T1 and T2, and capacitor C 1 and C2, stray transformer T1 and T2 respectively have a secondary winding; The CCFL two ends are serially connected with capacitor C.
Wherein, the former limit winding of stray transformer T1 and T2 is respectively applied for the voltage output end that connects inverter, the end of the same name of one termination stray transformer T1 of capacitor C 1, one end of another termination capacitor C 2 of capacitor C 1, the different name end of another termination stray transformer T2 of capacitor C 2, the different name end of stray transformer T1 secondary winding links to each other with the end of the same name of stray transformer T2 secondary winding, and the different name end of the end of the same name of stray transformer T1 secondary winding and stray transformer T2 secondary winding is used to drive the voltage signal of CCFL work for the voltage output end output of this supply unit.
In order to solve the unequal problem of supply lines direct-to-ground capacitance, guarantee that the direct-to-ground capacitance of lamp tube ends is equal substantially, can in supply unit, further add building-out capacitor CC; Wherein, the high end of output voltage to earth in the voltage output end of the end of building-out capacitor CC connection supply unit, the other end ground connection of building-out capacitor CC.
Flow through the current value of secondary winding for the ease of measurement, in supply unit, can further include: current transformer Is; Wherein, the different name end of one termination stray transformer T1 secondary winding of current transformer Is primary side, the end of the same name of another termination stray transformer T2 secondary winding of current transformer Is primary side, ground connection behind the current transformer Is secondary side series resistor Rs, current transformer Is is used to measure the current value that flows through stray transformer secondary winding.
Adopt two each supply units of forming by the stray transformer of a secondary winding to drive CCFL in the above-mentioned display unit, can also adopt a supply unit of forming by the stray transformer of two secondary windings to drive CCFL and obtain the display unit that the utility model embodiment 7 as shown in figure 11 provides.The distinctive points of being made up of a stray transformer supply unit of forming and the supply unit of being made up of two stray transformers only is, two secondary windings are provided by a stray transformer, the annexation of supply unit is identical with the supply unit of being made up of two stray transformers, is not giving unnecessary details at this.
More than a kind of supply unit provided by the utility model, display unit are described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand its core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (8)
1. supply unit comprises: stray transformer, it is characterized in that,
The different name end of the described first secondary winding is connected with the end of the same name of the described second secondary winding;
The different name end of the end of the same name of the described first secondary winding and the described second secondary winding is as described power source voltage output, and output drives the voltage signal of fluorescent tube.
2. power supply as claimed in claim 1 is characterized in that, also comprises: current transformer;
The different name end of the first secondary winding is connected with the end of the same name of the second secondary winding and is specially:
The different name end of the described first secondary winding is connected to an end of described current transformer primary side, and the other end of described current transformer primary side is connected to the end of the same name of the described second secondary winding.
3. power supply as claimed in claim 1 or 2 is characterized in that, also comprises: electric capacity;
One end of described electric capacity is connected to the high end of voltage to earth in the described voltage output end, the other end ground connection of described electric capacity.
4. power supply as claimed in claim 3 is characterized in that, the described first secondary winding and the second secondary winding belong to same stray transformer, and perhaps, the described first secondary winding and the second secondary winding belong to two stray transformers respectively.
5. a display unit is characterized in that, comprising: power supply, the cold-cathode fluorescence lamp of many parallel connections;
Described power supply comprises: stray transformer;
The different name end of the described first secondary winding is connected with the end of the same name of the described second secondary winding;
The end of the same name of the described first secondary winding is exported the voltage signal that is used to drive described many cold-cathode fluorescence lamp work in parallel with the different name end of the described second secondary winding as described power source voltage output.
6. device as claimed in claim 5 is characterized in that, also comprises: current transformer;
The different name end of the first secondary winding is connected with the end of the same name of the second secondary winding and is specially:
The different name end of the described first secondary winding is connected to an end of described current transformer primary side, and the other end of described current transformer primary side is connected to the end of the same name of the described second secondary winding.
7. as claim 5 or 6 described devices, it is characterized in that, also comprise: electric capacity;
One end of described electric capacity is connected to the high end of voltage to earth in the described voltage output end, the other end ground connection of described electric capacity.
8. device as claimed in claim 7 is characterized in that, the described first secondary winding and the second secondary winding belong to same stray transformer; Perhaps, the described first secondary winding and the second secondary winding belong to two stray transformers respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201429043U CN201038013Y (en) | 2007-04-17 | 2007-04-17 | Electric power unit and display device |
| PCT/CN2008/070489 WO2008125040A1 (en) | 2007-04-17 | 2008-03-13 | A power source apparatus, a display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201429043U CN201038013Y (en) | 2007-04-17 | 2007-04-17 | Electric power unit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201038013Y true CN201038013Y (en) | 2008-03-19 |
Family
ID=39210532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201429043U Expired - Fee Related CN201038013Y (en) | 2007-04-17 | 2007-04-17 | Electric power unit and display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN201038013Y (en) |
| WO (1) | WO2008125040A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3898517A (en) * | 1974-06-14 | 1975-08-05 | Gen Electric | Ballast circuit |
| CN2751507Y (en) * | 2004-02-16 | 2006-01-11 | 哈尔滨世纪旌旗科技有限责任公司 | Power-saving voltage-stabilizing controller for illumination |
| CN1879286A (en) * | 2004-11-12 | 2006-12-13 | 株式会社村田制作所 | Switching power supply |
-
2007
- 2007-04-17 CN CNU2007201429043U patent/CN201038013Y/en not_active Expired - Fee Related
-
2008
- 2008-03-13 WO PCT/CN2008/070489 patent/WO2008125040A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008125040A1 (en) | 2008-10-23 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Effective date of registration: 20101206 Granted publication date: 20080319 |
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| PD01 | Discharge of preservation of patent |
Date of cancellation: 20110606 Granted publication date: 20080319 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20100417 |