CN201119099Y - Electronic ballast - Google Patents
Electronic ballast Download PDFInfo
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- CN201119099Y CN201119099Y CNU2007201822649U CN200720182264U CN201119099Y CN 201119099 Y CN201119099 Y CN 201119099Y CN U2007201822649 U CNU2007201822649 U CN U2007201822649U CN 200720182264 U CN200720182264 U CN 200720182264U CN 201119099 Y CN201119099 Y CN 201119099Y
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Abstract
The utility model relates to an electronic ballast, which comprises a filter circuit used for receiving the first frequency alternating current and filtering the input alternating current; a rectification circuit used for rectifying the alternating current after the filtering to generate direct current voltage; a inverter circuit used for transferring the direct current voltage into the second frequency alternating current voltage, and the second frequency is higher than the first frequency; an output network used for connecting with load and providing load with second frequency alternating current; wherein the inverter circuit is a push-pull type inverter circuit which comprises a transformer, a first switch element, a second switch element, a starting capacitor and a starting switch. Not only the power factor of the electronic ballast is high, the energy conservation effect is good, but also the application scope is wide.
Description
Technical field
The utility model relates to the electric ballast field, relates in particular to a kind of electric ballast with push-pull inverter.
Background technology
Ballasts Used in Fluorescent Light mainly contains two kinds, and a kind of is Inductive ballast, and it is by the inert gas in the fluorescent tube two ends apply the high electrical breakdown fluorescent tube, thereby fluorescent material is lighted; Another kind is an electric ballast, and it makes fluorescent lamp lighting by the high-frequency alternating current that serial or parallel connection resonance forms.Inductive ballast because have that volume is big, many shortcomings such as Heavy Weight, energy consumption be big, and power factor is low, eliminated by market gradually.On the contrary, the electronic ballast that replaces Inductive ballast has plurality of advantages such as volume is little, in light weight, power factor height, thereby is subjected to consumers in general's favor.
Yet present electric ballast still has many improvements for the treatment of, for example: the ac frequency of output is not high, and power factor is low, and the fluorescent tube energy-saving effect is not good, is suitable for the narrow range of fluorescent tube specification, is difficult to be complementary etc. with the fluorescent tube with various different impedance operators.
The utility model content
The technical problems to be solved in the utility model is, overcomes above-mentioned the deficiencies in the prior art, and a kind of power factor height, fluorescent tube good energy-conserving effect, electric ballast applied widely are provided.
According to electric ballast of the present utility model, comprising: filter circuit receives the alternating current of first frequency and the alternating current of described input is carried out filtering; Rectification circuit is used for filtered alternating current is carried out rectification, to produce direct voltage; Inverter circuit is used for described direct voltage is converted to the alternating voltage of second frequency, and described second frequency is higher than described first frequency; And output network, be used for being connected with load and providing the alternating current of second frequency to it.Wherein, described inverter circuit is a push-pull inverter, and it comprises transformer, first switch element, second switch element, starts electric capacity and starting switch; Described first switch element and second switch element all have three terminals, and second end of described first switch element is connected with the 3rd end of described second switch element; One end on the former limit of described transformer is connected with the 3rd end of second end of described first switch element and described second switch element, first secondary of described transformer is connected between first end and the 3rd end of described first switch element, and its end of the same name is connected with the 3rd end; Second secondary of described transformer is connected between first end and the 3rd end of described second switch element, and its end of the same name is connected with first end.
Preferably, described first switch element and second switch element are triode, and described first end of the two is a base stage, and described second end is a collector electrode, and described the 3rd end is an emitter.
Preferably, described inverter circuit also comprises first end that is connected to described first switch element and described second switch element and two resistance between the 3rd end.
Preferably, described inverter circuit also comprises first end that is connected to described first switch element and described second switch element and two diodes between the 3rd end, the anode of described two diodes is connected with the 3rd end of described first switch element and described second switch element respectively, and negative electrode is connected with first end of described first switch element and described second switch element respectively.
Preferably, described inverter circuit also comprises second end that is connected in described second switch element and the electric capacity between the 3rd end.
Preferably, described inverter circuit also comprises first end that is connected in described first switch element and the diode between second end, and the anode of described diode is connected with first end of described first switch element, and negative electrode is connected with second end of described first switch element.
Preferably, described filter circuit is the RFI filter circuit, and it comprises inductance and the piezo-resistance that connects both ends of power respectively.
Preferably, this electric ballast also comprises circuit of power factor correction, and described circuit of power factor correction is connected with described rectification circuit, is used to improve the power factor from the direct voltage of described rectification circuit.
Preferably, described circuit of power factor correction comprises first diode, second diode and the 3rd diode and first electric capacity and second electric capacity; The positive plate of the negative electrode of described first diode and described first electric capacity is connected with the positive pole of described rectification circuit, and the anode of the negative plate of described second electric capacity and described the 3rd diode is connected with the negative pole of described rectification circuit; The positive plate of the anode of described first diode and described second electric capacity is connected with the negative electrode of described second diode, and the negative electrode of the negative plate of described first electric capacity and described the 3rd diode is connected with the anode of described second diode.
Described output network comprises first electric capacity, second electric capacity, the 3rd electric capacity, choking-winding and temperature-sensitive electricity group; One end of described first electric capacity and second electric capacity is connected with the both positive and negative polarity of described rectification circuit respectively, and the other end is used for being connected with an end of load; One end of described choking-winding is connected with the former limit of described transformer, and the other end is connected to the other end of described load; Described the 3rd electric capacity and described temperature-sensitive electricity group are parallel to the two ends of described load.
The electric ballast that provides according to the utility model owing to adopted the circuit design of optimizing, thereby not only power factor height, fluorescent tube good energy-conserving effect, and applied widely, can with the fluorescent lamp coupling of various different capacities.
Description of drawings
The block diagram of the electric ballast that provides according to the utility model is provided Fig. 1;
Fig. 2 is the line map of electric ballast shown in Figure 1.
Embodiment
Referring to Fig. 1, according to the electric ballast that the utility model provides, comprise filter circuit 1, rectification circuit 2, inverter circuit 3, output network 4 and circuit of power factor correction 5.As shown in the figure, this electric ballast in use, alternating current (for example civil power of 50Hz) at first inputs to filter circuit 1, by filter circuit 1 it is carried out filtering; Filtered alternating current inputs to rectification circuit 2, by rectification circuit 2 alternating current is converted to direct current; Direct current inputs to circuit of power factor correction 5 again, and circuit of power factor correction 5 obtains lower current harmonics distortion by second compensation, makes the power factor of direct voltage be increased to 0.999; Inverter circuit 3 is converted to high-frequency ac voltage (can reach 30KHz) with the direct voltage that power factor improves again afterwards, exports load to by output network 4.Load is generally fluorescent lamp, and it is made up of fluorescent tube, the filament that is positioned at lamp tube ends, the inert gas that is positioned at fluorescent tube and fluorescent material.The output network 4 of electric ballast is connected with the filament of lamp tube ends, by applying to it from the inert gas in the high-frequency ac electrical breakdown fluorescent tube of inverter, makes its conducting, thereby makes fluorescent lamp lighting.
Referring to Fig. 2, in the utility model, filter circuit 1 is RFI filter circuit (a radio frequency interference filter circuit), and it comprises inductance L 1 and the piezo-resistance FX that connects both ends of power respectively.The harmonic wave that the RFI filter circuit can stop on the one hand this electric ballast to produce feeds back in the input AC electrical network, to suppress to the pollution of electrical network with to the interference of electronic equipment; Can also prevent from the other hand to invade this electric ballast from the interference of electrical network.Rectification circuit 2 is a full-wave rectifying circuit, and it will be converted to the half-wave DC of pulsation by the alternating current of filter circuit 1 input.The half-wave DC electricity of pulsation inputs to circuit of power factor correction 5, improves its power factor by circuit of power factor correction 5 by second compensation.Afterwards, direct current inputs to inverter circuit 3 again, is converted to high-frequency alternating current by inverter circuit 3 and presses to output network output.
As shown in Figure 2, in the utility model, inverter circuit 3 is a push-pull inverter, and it comprises transformer B1, B2, B3, the first switch element T1, second switch elements T 2, starts capacitor C 3 and starting switch DB3.The first switch element T1 and second switch elements T 2 all have three terminals, and second end of the first switch element T1 is connected with the 3rd end of second switch elements T 2; The end of the former limit B1 of transformer is connected with second end of the first switch element T1 and the 3rd end of second switch elements T 2, and the other end is connected with output network 4; The first secondary B3 of transformer is connected between first end and the 3rd end of the described first switch element T1, and its end of the same name is connected with the 3rd end; The second secondary B2 of transformer is connected between first end and the 3rd end of described second switch elements T 2, and its end of the same name is connected with first end.
As a kind of preferred embodiment, first switch element T1 of the present utility model and second switch elements T 2 are triode, and first end of the two is a base stage, and second end is a collector electrode, and the 3rd end is an emitter.Certainly, just as well known to the skilled person, also can adopt other electronic switching element with three terminals (as thyristor, field effect transistor etc.) as the first switch element T1 and second switch elements T 2.
As shown in Figure 2, inverter circuit 3 also comprises first end and two resistance R 6 between the 3rd end, R7 and two diode D9, the D10 that is connected to the first switch element T1 and second switch elements T 2, the anode of two diode D9, D10 is connected with the 3rd end of the first switch element T1 and second switch elements T 2 respectively, and negative electrode is connected with first end of the first switch element T1 and second switch elements T 2 respectively.The secondary B3 that is resistance R 6, diode D9 and transformer is parallel between the base stage and emitter of triode T1, and the secondary B2 of resistance R 7, diode D10 and transformer is parallel between the base stage and emitter of triode T2.
In addition, inverter circuit 3 also comprises second end that is connected in second switch elements T 2 and the capacitor C 4 between the 3rd end (being collector electrode and the emitter of triode T2), and be connected in first end of the first switch element T1 and the diode D8 between second end (being base stage and the collector electrode of triode T2), the anode of diode D8 is connected with first end of the first switch element T1, and negative electrode is connected with second end of the first switch element T1.
This inverter circuit 3 can be converted to direct current the high-frequency alternating current that starts fluorescent lamp, and its operation principle is as follows:
After electric ballast powered up, the electric current of the R2 that flows through, R1 was to starting capacitor C 3 chargings.Be elevated to breakover voltage (about 35V) value of DB3 when the C3 both end voltage after, T1 is because of the forward bias conducting, and C3 then discharges by the base-emitter network of T1.In T1 conduction period, current path is: positive source → C6 → filament → C7 → filament → choking-winding L2 → primary winding B1 → T1 → ground.The transient change of T1 collector current (di/dt) respectively produces an induced electromotive force by elementary winding B1 at two secondary winding B2 and B3 two ends, and polarity is that each winding end of the same name is for negative.The base potential of T1 is raise, and base current and collector current further increase, and the positive feedback of interlock type makes T1 jump to the saturation conduction state immediately.When the T1 conducting, starting capacitor C 3 will produce further trigger impulse to stop the base stage to T1 by diode D8 and T1 discharge.
The start-up circuit that is made of capacitor C 3, starting switch DB3, triode T1 and resistance R 4 is used to provide an outer triggering signal, the foundation of the higher-order of oscillation and keep then and to produce positive feedback by means of the coupling between saturable transformer B1, B2, the B3 winding and realize.
After B1, B2, B3 reached capacity, the induced potential in each winding was zero, and the T1 base potential is on a declining curve, and electric current I reduces, and the induction electric among the B1 will definitely stop I to reduce, and polarity is end of the same name for just.So the T1 base potential descends, the T2 base potential raises, and the positive feedback of this interlock type makes T1 withdraw from the saturated cut-off state that jumps to rapidly, and T2 then jumps to saturation conduction by ending.When the T2 saturation conduction, current path is: positive source → T2 → B1 → choking-winding L2 → filament → C7 → filament → C5 → ground, promptly the sense of current is opposite with I.When pulse transformer B1, B2, B3 enter saturated after, the positive feedback of interlock type is very fast to make T1 saturation conduction once more again, and T2 by conducting transition for ending.So go round and begin again, T2 and T1 take turns conducting, and the sense of current on the startup capacitor C 7 that is parallel to fluorescent tube is constantly changed, and cause rapidly by L2 and C7 etc. and form LC network generation series resonance, produce a high-voltage pulse at the C7 two ends and be applied on the fluorescent tube, make the lamp ignition trigger.
As shown in Figure 2, output network 4 of the present utility model comprises first capacitor C 5, second capacitor C 6, the 3rd capacitor C 7, choking-winding L2 and temperature-sensitive electricity group PTC.One end of first capacitor C 5 and second capacitor C 6 is connected with the both positive and negative polarity of rectification circuit 2 respectively, and the other end is used for being connected with an end of load, and the two is used to completely cut off to come the direct voltage of self-rectifying circuit 2.The end of choking-winding L2 is connected with the former limit B1 of transformer, and the other end is connected to the other end of load, and it is used for the electric current of restricted passage load.The 3rd capacitor C 7 and temperature-sensitive electricity group PTC are parallel to the two ends of load, and temperature-sensitive electricity group PTC is used to make load (for example fluorescent lamp) time-delay to light, thereby prolongs its useful life.
Continue as shown in Figure 2, circuit of power factor correction 5 of the present utility model comprises the first diode D5, the second diode D6 and the 3rd diode D7 and first capacitor C 1 and second capacitor C 2; The positive plate of the negative electrode of the first diode D5 and first capacitor C 1 is connected with the positive pole of rectification circuit 2, and the anode of the negative plate of second capacitor C 2 and the 3rd diode D7 is connected with the negative pole of rectification circuit 2; The positive plate of the anode of the first diode D5 and second capacitor C 2 is connected with the negative electrode of the second diode D6, and the negative electrode of the negative plate of first capacitor C 1 and the 3rd diode D7 is connected with the anode of the second diode D6.This circuit of power factor correction 5 can improve the power factor of electric ballast greatly, and it is reached more than 0.999, thereby helps saving electric energy.
The circuit of electric ballast of the present utility model is compared with the circuit of other electric ballast, not only uses components and parts few thereby to have reduced cost low; And power factor height, (applicable to the fluorescent lamp of various different capacities) applied widely.
The foregoing description is only for the usefulness that the utility model is described; and be not to restriction of the present utility model; those skilled in the art are under the prerequisite that does not break away from spirit and scope of the present utility model, and the various equivalent structures of being made change all within protection range of the present utility model.Protection range of the present utility model is defined by the claims.
Claims (10)
1. electric ballast comprises:
Filter circuit (1) receives the alternating current of first frequency and the alternating current of described input is carried out filtering;
Rectification circuit (2) is used for filtered alternating current is carried out rectification, to produce direct voltage;
Inverter circuit (3) is used for described direct voltage is converted to the alternating voltage of second frequency, and described second frequency is higher than described first frequency; And
Output network (4) is used for being connected with load and providing the alternating current of second frequency to it;
It is characterized in that described inverter circuit (3) is a push-pull inverter, it comprises transformer (B1, B2, B3), first switch element (T1), second switch element (T2), starts electric capacity (C3) and starting switch (DB3); Described first switch element (T1) and second switch element (T2) all have three terminals, and second end of described first switch element (T1) is connected with the 3rd end of described second switch element (T2); One end on the former limit (B1) of described transformer is connected with the 3rd end of second end of described first switch element (T1) and described second switch element (T2), and the other end is connected with described output network (4); First secondary (B3) of described transformer is connected between first end and the 3rd end of described first switch element (T1), and its end of the same name is connected with the 3rd end; Second secondary (B2) of described transformer is connected between first end and the 3rd end of described second switch element (T2), and its end of the same name is connected with first end.
2. electric ballast according to claim 1 is characterized in that, described first switch element (T1) and second switch element (T2) are triode, and described first end of the two is a base stage, and described second end is a collector electrode, and described the 3rd end is an emitter.
3. electric ballast according to claim 1 and 2, it is characterized in that described inverter circuit (3) also comprises first end and two resistance between the 3rd end (R6, R7) that are connected to described first switch element (T1) and described second switch element (T2).
4. electric ballast according to claim 1 and 2, it is characterized in that, described inverter circuit (3) also comprises first end and two diodes between the 3rd end (D9, D10) that are connected to described first switch element (T1) and described second switch element (T2), the anode of described two diodes (D9, D10) is connected with the 3rd end of described first switch element (T1) with described second switch element (T2) respectively, and negative electrode is connected with first end of described first switch element (T1) with described second switch element (T2) respectively.
5. electric ballast according to claim 1 and 2 is characterized in that, described inverter circuit (3) also comprises second end that is connected in described second switch element (T2) and the electric capacity (C4) between the 3rd end.
6. electric ballast according to claim 1 and 2, it is characterized in that, described inverter circuit (3) also comprises first end that is connected in described first switch element (T1) and the diode (D8) between second end, the anode of described diode (D8) is connected with first end of described first switch element (T1), and negative electrode is connected with second end of described first switch element (T1).
7. electric ballast according to claim 1 and 2 is characterized in that, described filter circuit (1) is the RFI filter circuit, and it comprises inductance (L1) and the piezo-resistance (FX) that connects both ends of power respectively.
8. electric ballast according to claim 1 and 2, it is characterized in that, also comprise circuit of power factor correction (5), described circuit of power factor correction (5) is connected with described rectification circuit (2), is used for improving the power factor from the direct voltage of described rectification circuit (2).
9. electric ballast according to claim 8 is characterized in that, described circuit of power factor correction (5) comprises first diode (D5), second diode (D6) and the 3rd diode (D7) and first electric capacity (C1) and second electric capacity (C2); The positive plate of the negative electrode of described first diode (D5) and described first electric capacity (C1) is connected with the positive pole of described rectification circuit (2), and the anode of the negative plate of described second electric capacity (C2) and described the 3rd diode (D7) is connected with the negative pole of described rectification circuit (2); The positive plate of the anode of described first diode (D5) and described second electric capacity (C2) is connected with the negative electrode of described second diode (D6), and the negative electrode of the negative plate of described first electric capacity (C1) and described the 3rd diode (D7) is connected with the anode of described second diode (D6).
10. electric ballast according to claim 1 and 2 is characterized in that, described output network (4) comprises first electric capacity (C5), second electric capacity (C6), the 3rd electric capacity (C7), choking-winding (L2) and temperature-sensitive electricity group (PTC); One end of described first electric capacity (C5) and second electric capacity (C6) is connected with the both positive and negative polarity of described rectification circuit (2) respectively, and the other end is used for being connected with an end of load; One end of described choking-winding (L2) is connected with the former limit (B1) of described transformer, and the other end is connected to the other end of described load; Described the 3rd electric capacity (C7) and described temperature-sensitive electricity group (PTC) are parallel to the two ends of described load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201822649U CN201119099Y (en) | 2007-11-14 | 2007-11-14 | Electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201822649U CN201119099Y (en) | 2007-11-14 | 2007-11-14 | Electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201119099Y true CN201119099Y (en) | 2008-09-17 |
Family
ID=39993704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201822649U Expired - Fee Related CN201119099Y (en) | 2007-11-14 | 2007-11-14 | Electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201119099Y (en) |
-
2007
- 2007-11-14 CN CNU2007201822649U patent/CN201119099Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20111114 |