CN2640197Y - Electronic balast - Google Patents
Electronic balast Download PDFInfo
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- CN2640197Y CN2640197Y CN 03277509 CN03277509U CN2640197Y CN 2640197 Y CN2640197 Y CN 2640197Y CN 03277509 CN03277509 CN 03277509 CN 03277509 U CN03277509 U CN 03277509U CN 2640197 Y CN2640197 Y CN 2640197Y
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Abstract
The utility model relates to an electronical ballast, which comprises a rectifier filter circuit, a power factor adjustment circuit, a control circuit, a drive circuit and a start preheating circuit. The start preheating circuit comprises a filament transformer, wherein, the primary winding is connected with the output port of the drive circuit, and the sub winding forms a loop with filament. Among the stated primary winding loop of filament transformer, an electronical switch with time delay circuit is added in series. The electronical switch is turned on while started and cut off after time delay. The utility model avoids the useless energy consumption of filament and improves efficiency of the electronical ballast. At the same time, the circuit frame is simple.
Description
Technical field
The utility model relates to a kind of ballast structure, is specifically related to a kind of electric ballast that adopts preheating transformer to carry out filament pre-heating when starting.
Background technology
Electric ballast is used to fluorescent lamp, electricity-saving lamp etc., substitutes common ballast and uses.It generally includes current rectifying and wave filtering circuit, high-frequency inverter circuit, control circuit and startup preheat circuit, wherein, starts preheat circuit and is used for when starting, and provides the preheat curent of certain hour to filament, makes filament be able to preheating, lights fluorescent tube so that discharge electronics; Control circuit is used to control startup, FEEDBACK CONTROL and the protection etc. of preheating, lamp.
Early stage startup preheat circuit, adopt at the oscillating circuit transistor base adds electric capacity time-delay and resonant capacitance two termination semistors (PTC) formation more, its line construction is simple, but pre-heat effect is bad, it is big inadequately to show as preheat curent, fall short of warm-up time, thus the infringement lamp tube service life; And after the normal startup of fluorescent lamp, still have electric current in PTC and the filament, cause generating heat and invalid power loss, the surface temperature of PTC can be up to 80～120 ℃.Another kind of is to utilize relay to constitute, whole preheat circuit complexity, and the unreliable and life-span that mechanical action causes operating reduce.
Therefore, in up-to-date electric ballast, the each several part circuit has all been made improvement, wherein high-frequency inverter circuit is made of power factor adjustment circuit and drive circuit, drive circuit is generally high frequency power MOSFET half-bridge, output connection work ballast inductance, power factor is adjusted circuit and had both been offered the output of high frequency power MOSFET half-bridge with 450 volts of high-quality high voltage sourcies of left and right sides direct current, also the waveform of input current arrangement for the sine wave of input voltage homophase, thereby obtain very high power factor, control circuit is partly made the electric ballast application-specific integrated circuit (ASIC), start the time of preheating and the starting of lamp by its control, wherein, for obtaining best preheat curent, start in the preheat circuit and comprised the filament pre-heating transformer, its elementary winding is connected on the output of drive circuit, secondary winding then connects filament, preheating is provided, when being used for double tube fluorescent lamp, two fluorescent tube series connection, the filament pre-heating transformer secondary output has 3 windings, and the filament at two fluorescent tube two ends is provided respectively, and 2 filament pre-heatings that are cascaded.
The setting of this filament pre-heating transformer, make filament obtain best preheat curent, yet, in the ballast normal operating conditions, because the elementary winding of filament pre-heating transformer still is connected on the MOSFET half-bridge output that is equivalent to the fluorescent tube high frequency electric source, in the filament of fluorescent tube still thoughts sizable electric current should be arranged, the power consumption of excessive heater current on filament influenced the raising of ballast efficient undoubtedly, in order to improve the efficient of ballast, adopt off resonance inhibition method to suppress heater current at present, yet its effect is still unsatisfactory.
Summary of the invention
The utility model purpose provides a kind of electric ballast that adopts the filament pre-heating transformer realize to start preheating, makes it when the fluorescent tube operate as normal, and filament pre-heating transformer secondary do not have electric current, to reduce heating, improves the efficient of electric ballast.
For achieving the above object, the technical solution adopted in the utility model is: a kind of electric ballast, comprise current rectifying and wave filtering circuit, power factor adjustment circuit, control circuit, drive circuit and startup preheat circuit, comprise filament transformer in the described startup preheat circuit, its elementary winding is connected on the output of drive circuit, secondary winding and filament constitute the loop, in the elementary winding loop of described filament transformer, series connection one has the electronic switch of delay circuit, electronic switch conducting during startup, electronic switch ends after delaying time.
In the technique scheme, for ease of circuit design, common described electronic switch is series between the elementary winding and ground of filament transformer.
In the technique scheme, described electronic switch is high voltage bearing switching device, and described delay circuit is a low pressure delay switch, and the low pressure delay switch is connected in the control loop of switching device.
In the technique scheme, described switching device can adopt any one rated voltage to constitute at the switching device more than 600 volts, for example, described switching device can be metal-oxide-semiconductor, its drain electrode is connected with an end of the elementary winding of filament transformer, source ground, grid is connected with positive supply through resistance, is connected with ground through delay switch simultaneously.Positive supply wherein can be 12 volts of power supplys that provided by the pumping source of controlling application-specific integrated circuit (ASIC).A simple and practical delay switch is made up of triode, charging resistor and charging capacitor, the grid of metal-oxide-semiconductor is connected to the collector electrode of triode, the emitter of triode is connected with ground, charging capacitor is connected between the base stage and emitter of triode, and charging resistor is connected between the base stage and positive supply of triode.
Perhaps, described switching device also can be power transistor, and its collector electrode is connected with an end of the elementary winding of filament transformer, grounded emitter, and base stage is connected with positive supply through resistance, is connected with ground through delay switch simultaneously.
Moreover described switching device also can be high-voltage relay, and the normally-closed contact of relay is connected between the elementary winding and ground of filament transformer, and normally opened contact disconnects, and control coil is connected with delay switch.
In the technique scheme, described control circuit adopts the electric ballast application-specific integrated circuit (ASIC), the half-bridge circuit of described drive circuit for constituting by two metal-oxide-semiconductors, and its output connects fluorescent tube through the work ballast inductance.
Because the technique scheme utilization, the utility model compared with prior art has following advantage:
1. because the utility model electronic switch of in the primary coil loops of filament transformer, having connected, after starting time-delay, electronic switch turn-offs, thereby, when operate as normal, the filament transformer primary coil loops disconnects, and does not have induced current in the secondary coil, avoid the useless power consumption of filament, improved the efficient of electron rectifier;
2. adopt the delay control circuit of metal-oxide-semiconductor and RC charging, circuit structure is simple, is adapted at using in the electron rectifier;
3. the power supply of electronic switch and delay circuit is taken from the electron rectifier application-specific integrated circuit (ASIC), does not need corresponding power circuit, has further simplified circuit structure.
Description of drawings
Accompanying drawing 1 is the circuit structure block diagram of the utility model embodiment one;
Accompanying drawing 3 is the electronic switch part electrical schematic diagram of embodiment two;
Accompanying drawing 4 is the electronic switch part electrical schematic diagram of embodiment three.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described, embodiment only is used for auxiliary understanding to claims, does not limit the protection range of this patent:
Embodiment one: shown in accompanying drawing 1 and accompanying drawing 2, a kind of electric ballast, be applicable to common voltage scope 120V-277V～/T5-54W * 2 fluorescent tubes series connection access type fluorescent lamp uses, it comprises current rectifying and wave filtering circuit, power factor is adjusted circuit, control circuit, drive circuit, work inductance and startup preheat circuit, described control circuit is made of electric ballast application-specific integrated circuit (ASIC) L6574 and peripheral circuit thereof, described drive circuit is by two metal-oxide-semiconductor Q1, the half-bridge circuit that Q2 constitutes, the model of metal-oxide-semiconductor is IRF840, the output of drive circuit is connected to 2 lamp tube ends of series connection through work inductance T2, comprise filament transformer TA1 in the described startup preheat circuit, one end, 6 pin of its elementary winding are connected on the output of drive circuit, pass through electronic switch ground connection behind the other end 2 foot meridian capacitor CA2, secondary winding has 3 groups of formations, pin 1,5; 3,7; 4,83 groups of filaments formation preheating circuits that are connected in series respectively to 2 fluorescent tubes.
The switching device that the electronic switch of present embodiment adopts is a metal-oxide-semiconductor, can select the metal-oxide-semiconductor of D2NC60 model for use, the 2 foot meridian capacitor CA2 of filament transformer TA1 are connected to the drain electrode of metal-oxide-semiconductor QA1, the source electrode of metal-oxide-semiconductor QA1 connects public ground, grid one tunnel is through resistance R A2, diode DA3 is connected to the 12V pumping source of L6574, after the ballast energized, L6574 is operated in higher pre-heat frequency, pumping source provides 12V voltage immediately and passes through diode DA3, resistance R A2 is to the grid of metal-oxide-semiconductor QA1, the QA1 conducting makes capacitor C A2 ground connection, constitute the LC series load with the primary inductance of filament transformer TA1, filament obtains abundant preheating by the secondary power supply of transformer; Another road of metal-oxide-semiconductor QA1 grid connects the collector electrode of transistor QA2, transistor QA2 can select 9013 for use, its grounded emitter, be connected to charging capacitor CA3 between base stage and the emitter, when metal-oxide-semiconductor QA1 conducting, the 12V power supply charges to charging capacitor CA3 through charging resistor RA1 simultaneously, the base potential of transistor QA2 improves thereupon, behind certain hour, transistor QA2 conducting is moved the grid level of metal-oxide-semiconductor QA1 to 0 level, metal-oxide-semiconductor QA1 is ended, present high-impedance state, blocked the elementary electric current of transformer TA1, thereby thoroughly close filament breaking.Among Fig. 2, also be connected to capacitor C A1 between grid and source electrode, diode DA4, DA5 are the fly-wheel diode of primary inductance.
The current rectifying and wave filtering circuit of present embodiment becomes initial DC power supply to the 50/60Hz grid alternating current, comprising the EMI high frequency filter is arranged; Power factor is adjusted circuit and had both been offered the output of high power MOSFET half-bridge with 450 volts of high-quality high voltage sourcies of left and right sides direct current, thereby also the arrangement of the waveform of input current is obtained very high power factor for the sine wave with the input voltage homophase; Control circuit is the program start circuit, is used for the FEEDBACK CONTROL of startup that follow procedure carries out filament pre-heating and lamp, lamp power and carries out various defencive functions; The half-bridge circuit of drive circuit for constituting by two MOSFET, it is connected to work inductance and filament transformer simultaneously, and the fluorescent tube of two series connection is as their load.Thereby present embodiment has that suitable voltage range is wide, power factor can be up to 0.99, the total harmonic wave of input current less than 10%, fluorescent tube series connection access type structure alleviated the load to inductor, add the structure that in filament transformer, connects electronic switch that present embodiment adopts, present embodiment can be brought up to the efficiency index of ballast 91% (120V～)-93% (277V～), and the test result ginseng is shown in Table 1.
Table 1:120-277V～/T5-54W * 2 concatenation type programming start electric ballasts
Turn-off the contrast of preheating transformer front and back efficient
| Sequence number | The electrical quantity title | Symbol | Unit | Do not use this patent | Adopt this patent |
| 1 | 120V～input power | Pi(120V～) | W | 120.51 | 115.59 |
| 2 | 120V～power output | Po(120V～) | W | 103.8 | 105.6 |
| 3 | 120V～filament pre-heating electric current | Ifp(120V～) | A | 0.771 | 0.771 |
| 4 | 120V～filament operating current | Ifg(120V～) | A | 0.325 | 0.044 |
| 5 | 120V～efficient | eff(120V～) | ％ | 86.13 | 91.35 |
| 6 | 277V～input power | Pi(277V～) | W | 116.79 | 113.57 |
| 7 | 277V～output current | Po(277V～) | W | 104.0 | 105.8 |
| 8 | 277V～filament pre-heating electric current | Ifp(277V～) | A | 0.665 | 0.665 |
| 9 | 277V～filament operating current | Ifg(277V～) | A | 0.325 | 0.043 |
| 10 | 277V～efficient | eff(277V～) | ％ | 89.0 | 93.15 |
Embodiment two: shown in accompanying drawing 3, a kind of electric ballast, comprise current rectifying and wave filtering circuit, power factor is adjusted circuit, control circuit, drive circuit, work inductance and startup preheat circuit, start in the preheat circuit and comprise filament transformer TA1, one end, 6 pin of its elementary winding are connected on the output of drive circuit, pass through electronic switch ground connection behind the other end 2 foot meridian capacitor CA2, its basic circuit structure is identical with embodiment one, wherein, the switching device of electronic switch is a power transistor, and its collector electrode is connected grounded emitter with an end of the elementary winding of filament transformer, base stage is connected with positive supply through resistance, is connected with ground through delay switch simultaneously.
Embodiment three: shown in accompanying drawing 4, a kind of electric ballast, comprise current rectifying and wave filtering circuit, power factor is adjusted circuit, control circuit, drive circuit, work inductance and startup preheat circuit, start in the preheat circuit and comprise filament transformer TA1, one end, 6 pin of its elementary winding are connected on the output of drive circuit, pass through electronic switch ground connection behind the other end 2 foot meridian capacitor CA2, its basic circuit structure is identical with embodiment one, wherein, the switching device of electronic switch is a relay, the normally-closed contact of relay is connected between the elementary winding and ground of filament transformer, and control coil J connects with delay switch.During startup, relay normally-closed contact J1 closure, preheating is carried out in the elementary winding conducting of filament transformer, simultaneously, and electric capacity charging in the delay circuit, during to transistor QA2 conducting, relay adhesive action, normally-closed contact J1 disconnects, and the elementary winding of filament transformer is disconnected.
Claims (8)
1. electric ballast, comprise current rectifying and wave filtering circuit, power factor adjustment circuit, control circuit, drive circuit and startup preheat circuit, comprise filament transformer [TA1] in the described startup preheat circuit, its elementary winding is connected on the output of drive circuit, secondary winding and filament constitute the loop, it is characterized in that: in the elementary winding loop of described filament transformer [TA1], series connection one has the electronic switch of delay circuit, electronic switch conducting during startup, electronic switch ends after delaying time.
2. electric ballast according to claim 1 is characterized in that: described electronic switch is series between the elementary winding and ground of filament transformer [TA1].
3. electric ballast according to claim 1 and 2 is characterized in that: described electronic switch is high voltage bearing switching device, and described delay circuit is a low pressure delay switch, and the low pressure delay switch is connected in the control loop of switching device.
4. electric ballast according to claim 3, it is characterized in that: described switching device is metal-oxide-semiconductor [QA1], and its drain electrode is connected source ground with an end of the elementary winding of filament transformer [TA1], grid is connected with positive supply through resistance R A2, is connected with ground through delay switch simultaneously.
5. electric ballast according to claim 4, it is characterized in that: described delay switch is made up of triode [QA2], charging resistor [RA1] and charging capacitor [CA3], the grid of metal-oxide-semiconductor [QA1] is connected to the collector electrode of triode [QA2], the emitter of triode [QA2] is connected with ground, charging capacitor [CA3] is connected between the base stage and emitter of triode [QA2], and charging resistor [RA1] is connected between the base stage and positive supply of triode [QA2].
6. electric ballast according to claim 3, it is characterized in that: described switching device is power transistor [QA1], its collector electrode is connected with an end of the elementary winding of filament transformer [TA1], grounded emitter, base stage is connected with positive supply through resistance [RA2], is connected with ground through delay switch simultaneously.
7. electric ballast according to claim 3 is characterized in that: described switching device is high voltage bearing relay [J], and the normally-closed contact [J1] of relay [J] is connected between the elementary winding and ground of filament transformer, and control coil is connected with delay switch.
8. electric ballast according to claim 1, it is characterized in that: described control circuit adopts the electric ballast application-specific integrated circuit (ASIC), described drive circuit is the half-bridge circuit that is made of two metal-oxide-semiconductors [Q1, Q2], and its output connects fluorescent tube through the work ballast inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277509 CN2640197Y (en) | 2003-08-08 | 2003-08-08 | Electronic balast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277509 CN2640197Y (en) | 2003-08-08 | 2003-08-08 | Electronic balast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2640197Y true CN2640197Y (en) | 2004-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03277509 Expired - Fee Related CN2640197Y (en) | 2003-08-08 | 2003-08-08 | Electronic balast |
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| Country | Link |
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| CN (1) | CN2640197Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109121272A (en) * | 2018-09-15 | 2019-01-01 | 徐宇伟 | A kind of discharge lamp with low-voltage intelligent formula starting ballasting circuit |
-
2003
- 2003-08-08 CN CN 03277509 patent/CN2640197Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109121272A (en) * | 2018-09-15 | 2019-01-01 | 徐宇伟 | A kind of discharge lamp with low-voltage intelligent formula starting ballasting circuit |
| CN109121272B (en) * | 2018-09-15 | 2024-04-02 | 徐宇伟 | Discharge lamp with low-voltage intelligent starting ballasting circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |