CN203596966U - Fluorescent lamp ballast filament turn-off control circuit - Google Patents
Fluorescent lamp ballast filament turn-off control circuit Download PDFInfo
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- CN203596966U CN203596966U CN201320797969.7U CN201320797969U CN203596966U CN 203596966 U CN203596966 U CN 203596966U CN 201320797969 U CN201320797969 U CN 201320797969U CN 203596966 U CN203596966 U CN 203596966U
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Abstract
The utility model provides a fluorescent lamp ballast filament turn-off control circuit which comprises a fluorescent lamp tube, a choking inductor, a preheating inductor, a power tube (Q1) and resistor-capacitor elements. The fluorescent lamp tube (L11) internally comprises a first filament (L12) and a second filament (L13). A first secondary coil (T2-B1) of the preheating inductor is connected with a first capacitor (C1) in series and is connected to two ends of the first filament (L12). A second secondary coil (T2-B2) of the preheating inductor is connected with a second capacitor (C2) in series and is connected to two ends of the second filament (L13). An output end of a bridge-type rectification circuit is connected with one end of the first filament (L12) through a first resistor (R1). The other end of the first filament (L12) is connected with a grid electrode of the power tube (Q1) through a second resistor (R2). A primary coil (T1-A) of the choking inductor on an output end of a half-bridge circuit is connected with the connection point between the first filament (L12) and the resistor (R2). By adopting the technical scheme provided by the utility model, the filament current can be turned off after the fluorescent lamp tube is lighted.
Description
Technical field
The utility model relates to lighting apparatus field, relates in particular to a kind of fluorescent lamp ballast filament and switches off control circuit.
Background technology
Along with requiring the development of " green illumination " concept of illuminating energy-saving, the protection ecological balance, people are more and more urgent to the demand of energy-efficient light source.And fluorescent lamp is as a kind of lighting source, promotion and application are widely obtained in daily life.As shown in Figure 1, fluorescent lamp tube comprises electrode 11, seal wire 12, filament 13 and glass tube 14, and fluorescent lamp tube has negative resistance charactertistic, be that fluorescent lamp tube is not in the time triggering startup, the equivalent resistance infinity of fluorescent lamp tube, after fluorescent lamp tube is triggered and lights, fluorescent lamp tube is Low ESR.Fluorescent lamp ballast can play the effect of current limliting, makes the work that fluorescent lamp can be stable.And in order to realize energy-saving and emission-reduction, the ballast of fluorescent lamp is had higher requirement.In the prior art, the ballast of fluorescent lamp is being lighted after fluorescent lamp, and Filament of fluorescent lamp still has electric current to pass through, and has increased the power loss of circuit, and has shortened the useful life of fluorescent tube.
Utility model content
In view of this, the utility model provides a kind of fluorescent lamp ballast filament to switch off control circuit, and lights after fluorescent lamp at the ballast of fluorescent lamp, realize Filament of fluorescent lamp cutout, effectively reduce the power loss of circuit, improved the useful life of fluorescent tube, reached the object of energy-saving and emission-reduction.
For achieving the above object, the utility model provides a kind of fluorescent lamp ballast filament to switch off control circuit, for fluorescent lamp ballast, described fluorescent lamp ballast comprises bridge rectifier and half-bridge circuit, described fluorescent lamp ballast filament switches off control circuit and comprises: choke induction, preheating inductance, power tube Q1 and the Resistor-Capacitor Unit of fluorescent lamp tube L11, described half-bridge circuit output, in described fluorescent lamp tube L11, comprise the first filament L12 and the second filament L13, the first secondary coil T2-B of described preheating inductance
1first capacitor C 1 of connecting, is connected to the two ends of the first filament L12 of described fluorescent lamp; The second subprime coil T2-B of described preheating inductance
2second capacitor C 2 of connecting, is connected to the two ends of the second filament L13 of described fluorescent lamp, one end ground connection of described the second filament L13; Described fluorescent lamp tube L11 two ends are parallel with the 3rd capacitor C 3; The output of described bridge rectifier is connected with one end of described the first filament L12 by the first resistance R 1, and the other end of described the first filament L12 is connected with the grid of described power tube Q1 by the second resistance R 2; Tie point place between described the second resistance R 2 and the grid of described power tube Q1 is connected with the 3rd resistance R 3, the other end ground connection of described the 3rd resistance R 3; The two ends of described the 3rd resistance R 3 are parallel with the 4th capacitor C 4; One end of the main coil T2-A of described preheating inductance connects the drain electrode of described power tube Q1, the other end is connected with one end of the secondary coil T1-B of the choke induction of described half-bridge circuit output by the 5th capacitor C 5, the other end ground connection of the secondary coil T1-B of the choke induction of described half-bridge circuit output; The source ground of described power tube Q1; The main coil T1-A of the choke induction of described half-bridge circuit output is connected on the tie point of described the first filament L12 and described the second resistance R 2.
Further, described fluorescent lamp tube is N, described N fluorescent lamp tube series connection, and the secondary coil of described preheating inductance is multiple, wherein N is greater than 1 integer, rear and described the 3rd Capacitance parallel connection of described N fluorescent lamp tube series connection; The two ends of the first filament of described the first fluorescent lamp tube, are connected with a secondary coil with the described preheating inductance of the first capacitances in series; The two ends of two adjacent fluorescent lamp tubes of described series connection, are all connected with a secondary coil with the described preheating inductance of a capacitances in series; The two ends of the second filament of described N fluorescent lamp tube, are connected with and a secondary coil of the described preheating inductance of the second capacitances in series one end ground connection of the second filament of described N fluorescent lamp tube.
Further, described power tube Q1 is metal-oxide-semiconductor.
The utlity model has following beneficial effect:
The technical scheme that adopts the utility model to provide, by utilizing the negative resistance charactertistic of fluorescent lamp tube, simplify fluorescent-lamp ballast circuit structure, and can light after fluorescent lamp at the ballast of fluorescent lamp, realize Filament of fluorescent lamp cutout, effectively reduce the power loss of circuit, improved the useful life of fluorescent tube, reached the object of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is lamp tube of fluorescent lamp schematic diagram.
The fluorescent lamp ballast filament that Fig. 2 provides for the utility model embodiment 1 schematic diagram that switches off control circuit.
Fig. 3 is the voltage-current characteristic schematic diagram of fluorescent lamp tube.
The fluorescent lamp ballast filament that Fig. 4 provides for the utility model embodiment 1 equivalent circuit diagram in the time of fluorescent tube preheating that switches off control circuit.
The equivalent circuit diagram that the fluorescent lamp ballast filament that Fig. 5 provides for the utility model embodiment 1 switches off control circuit after lamp tube starting.
The fluorescent lamp ballast filament that Fig. 6 provides for the utility model embodiment 2 schematic diagram that switches off control circuit.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.
The utility model is in prior art, the ballast of fluorescent lamp is being lighted after fluorescent lamp, and the problem that Filament of fluorescent lamp still has electric current to pass through provides a kind of fluorescent lamp ballast filament to switch off control circuit, can light after fluorescent lamp at the ballast of fluorescent lamp, realize Filament of fluorescent lamp cutout.
The fluorescent lamp ballast filament that Fig. 2 provides for the utility model embodiment 1 schematic diagram that switches off control circuit.As shown in the figure, described fluorescent lamp ballast filament switches off control circuit, for fluorescent lamp ballast, described fluorescent lamp ballast comprises bridge rectifier and half-bridge circuit, and described fluorescent lamp ballast filament switches off control circuit and comprises: (preheating inductance comprises main coil T2-A and two coil T2-B for the choke induction (choke induction comprises main coil T1-A and secondary coil T1-B) of fluorescent lamp tube L11, described half-bridge circuit output, preheating inductance
1, T2-B
2), power tube Q1 and Resistor-Capacitor Unit, in described fluorescent lamp tube L11, comprise the first filament L12 and the second filament L13.
The first secondary coil T2-B of described preheating inductance
1first capacitor C 1 of connecting, is connected to the two ends of the first filament L12 of described fluorescent lamp;
The second subprime coil T2-B of described preheating inductance
2second capacitor C 2 of connecting, is connected to the two ends of the second filament L13 of described fluorescent lamp, one end ground connection of described the second filament L13;
Described fluorescent lamp tube L11 two ends are parallel with the 3rd capacitor C 3;
The output of described bridge rectifier is connected with one end of described the first filament L12 by the first resistance R 1, and the other end of described the first filament L12 is connected with the grid of described power tube Q1 by the second resistance R 2;
Tie point place between described the second resistance R 2 and the grid of described power tube Q1 is connected with the 3rd resistance R 3, the other end ground connection of described the 3rd resistance R 3;
The two ends of described the 3rd resistance R 3 are parallel with the 4th capacitor C 4;
One end of the main coil T2-A of described preheating inductance connects the drain electrode of described power tube Q1, the other end is connected with the secondary coil T1-B of the choke induction of described half-bridge circuit output by the 5th capacitor C 5, the other end ground connection of the secondary coil T1-B of the choke induction of described half-bridge circuit output;
The source ground of described power tube Q1;
The main coil T1-A of the choke induction of described half-bridge circuit output is connected on the tie point of described the first filament L12 and described the second resistance R 2.
Fluorescent lamp tube and other gaseous discharge lamps are similar, have negative resistance charactertistic.The voltage-current characteristic of typical case's fluorescent lamp tube as shown in Figure 3.When the voltage that is applied to fluorescent tube two ends when external circuit triggers the ignition voltage Vigniton of fluorescent lamp tube lower than it, fluorescent tube be high resistant off state be the equivalent resistance of fluorescent tube in infinitely-great state, in fluorescent tube, flow through without pipe stream.When the voltage that is applied to lamp tube ends when external circuit reaches the ignition voltage of fluorescent tube, fluorescent tube igniting conducting, fluorescent tube has electric current to flow through, and fluorescent tube is negative resistance charactertistic and manages resistance for pipe pressure ratio pipe stream, and pipe resistance is less.Due to the current limliting ballast effect of external ballast, make tube current be stabilized in its rated value, and the fluorescent tube conduction voltage drop Vlamp of lamp tube ends is also stabilized in a steady state value.
In technique scheme, the fluorescent lamp ballast filament that the utility model embodiment 1 the provides virtual electronic components and parts in circuit using fluorescent tube that switch off control circuit.
The fluorescent lamp ballast filament that Fig. 4 provides for the utility model embodiment 1 equivalent circuit diagram in the time of fluorescent tube preheating that switches off control circuit.As shown in the figure, between warming up period, because virtual electronic components and parts are that fluorescent lamp tube L11 does not trigger startup, now to present high-impedance state be fluorescent lamp tube L11 equivalent resistance infinity to fluorescent lamp tube L11.Bridge rectifier output voltage is the first filament L12, the second resistance R 2 dividing potential drops of fluorescent lamp tube L11 through the first resistance R 1, virtual electronic components and parts, and now the 3rd resistance R 3 is a high level to ground voltage.The grid that is power tube Q1 is high potential, power tube Q1 conducting.The secondary coil T1-B of choke induction is as an energy source, LC series resonant circuit of main coil T2-A composition of the 5th capacitor C 5, preheating inductance connects power tube Q1 to ground, and the LC series resonance path of main coil T2-A, the power tube Q1 composition of the 5th capacitor C 5, preheating inductance is by the first secondary coil T2-B of preheating inductance
1coupling to the first filament L12 of fluorescent lamp tube L11 preheat curent is provided, by the second subprime coil T2-B of preheating inductance
2coupling provides preheat curent to the second filament L13 of fluorescent lamp tube L11.
The equivalent circuit diagram that the fluorescent lamp ballast filament that Fig. 5 provides for the utility model embodiment 1 switches off control circuit after lamp tube starting.As shown in the figure, when ballast resonant igniting triggers fluorescent lamp tube L11, after fluorescent lamp tube L11 lights, now fluorescent lamp tube L11 equiva lent impedance is that Low ESR is the voltage of fluorescent lamp tube L11 and the ratio that passes through the electric current of fluorescent lamp tube L11, because fluorescent lamp tube L11 is now in low impedance state, the voltage so just bridge rectifier output being divided in the 3rd resistance R 3 is that fluorescent lamp tube L11 switches to ground by virtual electronic components and parts, the 3rd resistance R 3 is electronegative potential over the ground, the grid of power tube Q1 is electronegative potential, and power tube Q1 turn-offs.The LC series resonant circuit being now made up of the main coil T2-A of the 5th capacitor C 5, preheating inductance, because power tube Q1 turn-offs without resonant tank, causes the main coil T2-A of preheating inductance cannot pass through its first secondary coil T2-B
1, second subprime coil T2-B
2coupling provides energy to filament, and filament no current flows through.
Further, described fluorescent lamp tube is N, described N fluorescent lamp tube series connection, and the secondary coil of described preheating inductance is multiple, wherein N is greater than 1 integer, rear and described the 3rd Capacitance parallel connection of described N fluorescent lamp tube series connection; The two ends of the first filament of described the first fluorescent lamp tube, are connected with a secondary coil with the described preheating inductance of the first capacitances in series; The two ends of two adjacent fluorescent lamp tubes of described series connection, are all connected with a secondary coil with the described preheating inductance of a capacitances in series; The two ends of the second filament of described N fluorescent lamp tube, are connected with and a secondary coil of the described preheating inductance of the second capacitances in series one end ground connection of the second filament of described N fluorescent lamp tube.
The fluorescent lamp ballast filament that Fig. 6 provides for the utility model embodiment 2 schematic diagram that switches off control circuit.As shown in the figure, on the basis of embodiment 1, the fluorescent tube of fluorescent lamp has N, and N fluorescent lamp tube is by the second filament and the series connection of the first filament of adjacent two fluorescent lamp tubes, and the secondary coil of preheating inductance is multiple, and N is greater than 1 integer.The two ends of the first filament L12 of the first fluorescent lamp L11 are parallel with the first secondary coil T2-B of the described preheating inductance of connecting with the first capacitor C 1
1, after the first filament L22 of the second fluorescent lamp L21 connects with the second filament L13 of the first fluorescent lamp L11, with the second subprime coil T2-B of described preheating inductance that is in series with a capacitor C
2in parallel ... the two ends of the second filament LN3 of N fluorescent lamp LN1 are parallel with the N secondary coil T2-B of the described preheating inductance of connecting with the second capacitor C 2
n, the minus earth of the described N secondary coil of described preheating inductance.
Fluorescent lamp ballast filament switch off control circuit with embodiment 1 in operation principle similar.Between warming up period, bridge rectifier output voltage is the first filament L12, the second resistance R 2 dividing potential drops of fluorescent lamp tube L11 through the first resistance R 1, virtual electronic components and parts, now the 3rd resistance R 3 is a high level to ground voltage. the grid that is power tube Q1 is high potential, power tube Q1 conducting.The secondary coil T1-B of choke induction is as an energy source, LC series resonant circuit of main coil T2-A composition of the 5th capacitor C 5, preheating inductance connects power tube Q1 to ground, and the LC series resonance path of main coil T2-A, the power tube Q1 composition of the 5th capacitor C 5, preheating inductance is by the first secondary coil T2-B of preheating inductance
1coupling to the first filament L12 of the first fluorescent lamp tube L11 preheat curent is provided, by the second subprime coil T2-B of preheating inductance
2coupling provides preheat curent to the second filament L13 of the first fluorescent lamp tube L11 and the first filament L22 of the second fluorescent lamp tube L21 ... N secondary coil T2-B
ncoupling provides preheat curent to the second filament LN3 of N fluorescent lamp tube LN1.
When ballast resonant igniting triggers N fluorescent lamp tube, after N fluorescent lamp tube lighted, now the impedance after N fluorescent lamp tube series connection is Low ESR, now the fluorescent lamp tube of N series connection is in low impedance state, the voltage so just bridge rectifier output being divided in the 3rd resistance R 3 switches to ground, the 3rd resistance R 3 is electronegative potential over the ground, and the grid of power tube Q1 is electronegative potential, and power tube Q1 turn-offs.The LC series resonant circuit being now made up of the main coil T2-A of the 5th capacitor C 5, preheating inductance turn-offs without resonant tank because of power tube Q1, cause the main coil T2-A of preheating inductance to power to filament by its secondary coil coupling, filament no current flows through.
Further, described power tube can be metal-oxide-semiconductor.
In technique scheme, power tube can be metal-oxide-semiconductor, can be also other transistors, as long as can realize and turn-off conducting according to the height of current potential.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1. a fluorescent lamp ballast filament switches off control circuit, for fluorescent lamp ballast, described fluorescent lamp ballast comprises bridge rectifier and half-bridge circuit, it is characterized in that, described fluorescent lamp ballast filament switches off control circuit and comprises: choke induction, preheating inductance, power tube (Q1) and the Resistor-Capacitor Unit of fluorescent lamp tube (L11), described half-bridge circuit output, in described fluorescent lamp tube (L11), comprise the first filament (L12) and the second filament (L13)
The first secondary coil (T2-B of described preheating inductance
1) series connection the first electric capacity (C1), be connected to the two ends of first filament (L12) of described fluorescent lamp;
Second subprime coil (the T2-B of described preheating inductance
2) series connection the second electric capacity (C2), be connected to the two ends of second filament (L13) of described fluorescent lamp, one end ground connection of described the second filament (L13);
Described fluorescent lamp tube (L11) two ends are parallel with the 3rd electric capacity (C3);
The output of described bridge rectifier is connected with one end of described the first filament (L12) by the first resistance (R1), and the other end of described the first filament (L12) is connected with the grid of described power tube (Q1) by the second resistance (R2);
Tie point place between the grid of described the second resistance (R2) and described power tube (Q1) is connected with the 3rd resistance (R3), the other end ground connection of described the 3rd resistance (R3);
The two ends of described the 3rd resistance (R3) are parallel with the 4th electric capacity (C4);
One end of the main coil (T2-A) of described preheating inductance connects the drain electrode of described power tube (Q1), the other end is connected with one end of the secondary coil (T1-B) of the choke induction of described half-bridge circuit output by the 5th electric capacity (C5), the other end ground connection of the secondary coil (T1-B) of the choke induction of described half-bridge circuit output;
The source ground of described power tube (Q1);
The main coil (T1-A) of the choke induction of described half-bridge circuit output is connected on the tie point of described the first filament (L12) and described the second resistance (R2).
2. fluorescent lamp ballast filament as claimed in claim 1 switches off control circuit, and it is characterized in that, described fluorescent lamp tube is N, described N fluorescent lamp tube series connection, and the secondary coil of described preheating inductance is multiple, wherein N is greater than 1 integer,
Described N fluorescent lamp tube connected afterwards and described the 3rd Capacitance parallel connection;
The two ends of the first filament of described the first fluorescent lamp tube, are connected with a secondary coil with the described preheating inductance of the first capacitances in series;
The two ends of two adjacent fluorescent lamp tubes of described series connection, are all connected with a secondary coil with the described preheating inductance of a capacitances in series;
The two ends of the second filament of described N fluorescent lamp tube, are connected with and a secondary coil of the described preheating inductance of the second capacitances in series one end ground connection of the second filament of described N fluorescent lamp tube.
3. fluorescent lamp ballast filament as claimed in claim 1 switches off control circuit, and it is characterized in that, described power tube (Q1) is metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797969.7U CN203596966U (en) | 2013-12-05 | 2013-12-05 | Fluorescent lamp ballast filament turn-off control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797969.7U CN203596966U (en) | 2013-12-05 | 2013-12-05 | Fluorescent lamp ballast filament turn-off control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203596966U true CN203596966U (en) | 2014-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320797969.7U Expired - Lifetime CN203596966U (en) | 2013-12-05 | 2013-12-05 | Fluorescent lamp ballast filament turn-off control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203596966U (en) |
-
2013
- 2013-12-05 CN CN201320797969.7U patent/CN203596966U/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140514 |