CN101287323B - Auto-excitation type electronic ballast with over-temperature protection function - Google Patents
Auto-excitation type electronic ballast with over-temperature protection function Download PDFInfo
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- CN101287323B CN101287323B CN2007100212236A CN200710021223A CN101287323B CN 101287323 B CN101287323 B CN 101287323B CN 2007100212236 A CN2007100212236 A CN 2007100212236A CN 200710021223 A CN200710021223 A CN 200710021223A CN 101287323 B CN101287323 B CN 101287323B
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- bridge drive
- drive circuit
- overtemperature
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Abstract
The invention relates to a self-excited type electronic ballast with overtemperature protection, which comprises rectifying filter circuits in series, a half-bridge drive circuit and an output circuit. An overtemperature protection circuit is connected between the output circuit and the half-bridge drive circuit. In the overtemperature protection circuit, the collecting electrode and the emitting electrode of a triode are connected with the collecting electrode and the emitting electrode of a triode in the half-bridge drive circuit in parallel while the base electrode of the triode is connected with a unidirectional controllable silicon cathode which is connected with a starting capacitor. The triggering terminal of the unidirectional controllable silicon is connected with the output terminal of an overtemperature detecting circuit by a bilateral diode. An inductance secondary winding, a diode, a thermal resistor and a voltage divider resistance are connected in series to form the overtemperature detecting circuit. The common terminal of the thermal resistor and the voltage divider resistance is connected with the input terminal of the bilateral diode in the overtemperature detecting circuit. The voltage divider resistance is connected with an electrolytic capacitor in parallel and an inductor is connected between the half-bridge drive circuit and the output circuit in series while the thermal resistor is arranged between the radiating ribs of the collecting electrode of the two triodes in the half-bridge drive circuit. The self- excited type electronic ballast with overtemperature protection of the invention can avoid the high-temperature operation of the triodes in the half-bridge drive circuit.
Description
Technical field
The present invention relates to the electrical lighting technology, particularly relate to a kind of auto-excitation type electric ballast that prevents triode overtemperature work in the half-bridge drive circuit.
Background technology
That fluorescent lamp has is energy-conservation, lighting source efficiently, is used widely in every field.As shown in Figure 1, be the fundamental diagram of existing typical auto-excitation type electric ballast.The dc power supply terminal of current rectifying and wave filtering circuit output resistance R 1 in this half-bridge drive circuit is connected to triode G2 base stage with bidirectional diode D2; And this resistance R 1 and bidirectional diode D2 common port are connected to charging capacitor C between over the ground; This triode G2 base stage after magnetic ring transformer L2 second subprime winding L 22 with this triode G2 emitter common ground; This triode G2 collector electrode is connected to triode G1 emitter; This triode G1 collector electrode is connected to this dc power supply terminal, and base stage is connected to this triode G2 base stage through first level winding L 21 of this magnetic ring transformer L2, this triode G1 and triode G2 common port; Be connected in series the elementary winding of this magnetic ring transformer L2 between this output circuit input, and twice level winding L 21 of this magnetic ring transformer L2 have opposite polarity with corresponding this two triodes G1 and the G2 emitter that is connected respectively with L22.
This output circuit is made up of with C2 with two capacitor C 1 that are connected into passive leg the resonant capacitance C3 that is parallel between this fluorescent lamp two ends filament; The elementary winding of this magnetic ring transformer L2 is connected in series through this fluorescent lamp one end filament and this resonant capacitance C3; This resonant capacitance C3 is connected with the C2 common port with this two capacitor C 1 through this fluorescent lamp other end filament, and this two capacitor C 1 is connected to this DC power supply anode respectively with the C2 other end and holds over the ground.
Auto-excitation type electric ballast all passes through strict check and screening again because its component number is few, and to transistor pairing sorting test, plate loss is low when adding the electric ballast operation, as long as keep good matching status with fluorescent tube, its reliability is high, the life-span is long.Thereby this series products is in great demand on market very much.But auto-excitation type electric ballast also has weak point: when the condition of high temperature (more than 100 ℃) takes place, will implement effective defencive function, must increase many additional protection circuit, make complex structure and be difficult to make defencive function complete.Reasons such as special fluorescent tube is aging cause that the tube voltage of fluorescent tube increases, and tube current reduces; Frequency of oscillation increases; Finally cause the pipe temperature of power transistor in the half-bridge drive circuit suddenly to gather increase, cause that wiring board (PCB) is burnt and charing at the pin weld of high power transistor, even smolder etc.
Summary of the invention
In order to solve above problem, the invention provides and a kind ofly can avoid the too high auto-excitation type electric ballast of triode pipe temperature in the half-bridge drive circuit.
Technical scheme of the present invention is achieved in that a kind of auto-excitation type electric ballast with overtemperature prote; Comprise the current rectifying and wave filtering circuit, half-bridge drive circuit and the output circuit that connect successively; Be connected to the overtemperature prote circuit between this output circuit and this half-bridge drive circuit; Transistor collector and emitter are parallel to the base stage and the emitter of a triode in this half-bridge drive circuit respectively in this overtemperature prote circuit; Transistor base is connected to the one-way SCR negative electrode in this overtemperature prote circuit; This one-way SCR anode is connected to and starts electric capacity charging voltage end in this half-bridge drive circuit; This one-way SCR trigger end is connected to overtemperature testing circuit output through bidirectional diode, this overtemperature testing circuit for successively the series connection inductance secondary winding, diode, have negative tempperature coefficient thermistor, divider resistance, this inductance secondary winding other end ground connection; This thermistor and divider resistance common port are connected to the input of bidirectional diode in this overtemperature prote circuit; And this divider resistance parallel connection electrochemical capacitor, this inductance is series between this half-bridge drive circuit and the output circuit, and this thermistor is arranged between two transistor collector fin in this half-bridge drive circuit.
As further improvement of the present invention, resistance is proofreaied and correct in the thermistor parallel connection in this overtemperature testing circuit, and this resistance of proofreading and correct resistance is more than a times of this thermistor normal temperature resistance, and this thermistor high temperature resistance descends more than one times.
As further improvement of the present invention, this thermistor is fixed between two transistor collector fin in this half-bridge drive circuit through thermal paper.
As further improvement of the present invention, the DC power supply anode of this current rectifying and wave filtering circuit output and over the ground between also be connected to circuit of power factor correction.
As further improvement of the present invention; This output circuit is made up of with C2 with two capacitor C 1 that are connected into passive leg the resonant capacitance C3 that is parallel between the filament of fluorescent lamp two ends; This resonant capacitance C3 is elementary around being connected in series through this magnetic ring transformer L2 of this fluorescent lamp one end filament and this half-bridge drive circuit output; Be connected with the C2 common port with this two capacitor C 1 through this fluorescent lamp other end filament again simultaneously, and this two capacitor C 1 is connected to the DC power supply anode respectively with the C2 other end and holds over the ground.
This overtemperature prote circuit detects two triode Guan Wen in this half-bridge drive circuit through this overtemperature testing circuit on the one hand; Discharge through the bidirectional diode in this overtemperature prote circuit, one-way SCR and this charging capacitor of triode control on the other hand, thereby control a transistor base voltage in this half-bridge drive circuit.Thermistor in this overtemperature testing circuit is fixed on two triodes in this half-bridge drive circuit between the fin through thermal paper.
Under normal temperature (25 ℃) situation; Because of this thermistor resistance is proofreaied and correct resistance more than one times for this; This thermistor depends on this correction resistance with this correction resistance parallel connection resistance, and the output voltage that is formed by this correction resistance and divider resistance is not enough so that the bidirectional diode triggering work in this overtemperature prote circuit.
In case two triode Guan Wen in this half-bridge drive circuit surpass certain value (more than 100 ℃); Promptly this thermistor is in the condition of high temperature, and its resistance is reduced to rapidly and is merely this correction resistance below one times, and this thermistor depends on this thermistor resistance with this correction resistance parallel connection resistance; Cause being elevated to the bidirectional diode conducting voltage by the output voltage that this thermistor and divider resistance form; Cause this bidirectional diode conducting, trigger this one-way SCR thus, make the triode conducting; Thereby this charging capacitor is through this triode discharge; Destroy the oscillation circuit that two triodes in this half-bridge drive circuit alternately form thus, promptly cut off the fluorescent lamp operation electric current, protected two triodes in this half-bridge drive circuit again.
Description of drawings
Fig. 1 is the fundamental diagram of auto-excitation type electric ballast in the prior art;
Fig. 2 is an operation principle block diagram of the present invention;
Fig. 3 is the said thermistor installation site sketch map among the present invention;
Fig. 4 is the fundamental diagram of auto-excitation type electric ballast of the present invention.
Embodiment
Further describe below in conjunction with Fig. 2, Fig. 3 and Fig. 4:
As shown in Figure 2; Auto-excitation type electric ballast with overtemperature prote; Comprise the current rectifying and wave filtering circuit, half-bridge drive circuit and the output circuit that connect successively; Also be connected to the overtemperature prote circuit between this output circuit and this half-bridge drive circuit simultaneously, the DC power supply anode of this current rectifying and wave filtering circuit output and over the ground between also be connected to circuit of power factor correction.
As shown in Figure 4; Triode G3 collector and emitter is parallel to base stage and the emitter of a triode G2 in this half-bridge drive circuit respectively in this overtemperature prote circuit; Triode G3 base stage is connected to one-way SCR D3 negative electrode in this overtemperature prote circuit; This one-way SCR D3 anode is connected to and starts capacitor C charging voltage end in this half-bridge drive circuit; This one-way SCR D3 trigger end is connected to overtemperature testing circuit output through bidirectional diode D1, and this overtemperature testing circuit has the thermistor that detects triode Guan Wen in this half-bridge drive circuit.
This overtemperature testing circuit for successively the series connection inductance L 1 secondary winding, diode D5, have negative tempperature coefficient thermistor RT, divider resistance R3; This inductance L 1 secondary winding other end ground connection; This thermistor RT and divider resistance R3 common port are connected to the input of bidirectional diode D1 in this overtemperature prote circuit; And this divider resistance R3 parallel connection electrochemical capacitor C5, this inductance L 1 is series between this half-bridge drive circuit and the output circuit.Through this diode D5 and electrochemical capacitor C5, by this thermistor RT and direct voltage of divider resistance R3 common port output, bidirectional diode D1 triggers in this overtemperature prote circuit thereby can control.
As shown in Figure 3, in order to detect triode Guan Wen in this half-bridge drive circuit better,
Two triode G1 and G2 collector electrode fin 1 and 2 in this half-bridge drive circuit are arranged side by side on printed substrate 4; This thermistor RT is fixed between this two triodes G1 and G2 collector electrode fin 1 and 2 through thermal paper 3 simultaneously, has so not only insulated but also heat conduction.
Resistance R 2 is proofreaied and correct in thermistor RT parallel connection in this overtemperature testing circuit; This proofreaies and correct resistance R 2 resistances is more than a times of this thermistor RT normal temperature (25 ℃) resistance; This thermistor RT changes at high temperature (more than 100 ℃) from normal temperature (25 ℃); Its resistance descends below one times, can guarantee like this: under the normal condition (be normal temperature state-25 ℃), because this thermistor resistance is this correction resistance R more than 2 one times; This thermistor RT depends on this correction resistance R 2 with correction resistance R 2 parallelly connected resistances, can design by this correction resistance R 2 not enough so that the bidirectional diode triggering work in this overtemperature prote circuit with the output voltage that divider resistance R1 forms.
In case two triode Guan Wen in this half-bridge drive circuit surpass certain value (more than 100 ℃); Its resistance is reduced to rapidly and is merely this correction resistance below one times; This thermistor RT depends on thermistor RT with correction resistance R 2 parallelly connected resistances, causes being elevated to the bidirectional diode conducting voltage by the output voltage that this thermistor RT and divider resistance R1 form, and causes this bidirectional diode conducting; Trigger this one-way SCR thus; Make the triode conducting, thereby this charging capacitor has destroyed the oscillation circuit that two triodes in this half-bridge drive circuit alternately form thus through this triode discharge; Promptly cut off the fluorescent lamp operation electric current, protected two triodes in this half-bridge drive circuit again.
As shown in Figure 4; The dc power supply terminal of this current rectifying and wave filtering circuit output resistance R 1 in this half-bridge drive circuit is connected to triode G2 base stage with bidirectional diode D2; And this resistance R 1 and bidirectional diode D2 common port are connected to charging C between over the ground; This triode G2 base stage after magnetic ring transformer L2 second subprime winding L 22 with this triode G2 emitter common ground, this triode G2 collector electrode is connected to triode G1 emitter, this triode G1 collector electrode is connected to this dc power supply terminal; And base stage is connected to this triode G2 base stage through first level winding L 21 of this magnetic ring transformer L2; This two triodes G1 and G2 common port and are connected in series the elementary winding of this magnetic ring transformer L2 between this output circuit input, and twice level winding L 21 of this magnetic ring transformer L2, L22 have opposite polarity with this two triode G1, the G2 emitter of corresponding connection respectively.This output circuit is made up of with C2 with two capacitor C 1 that are connected into passive leg the resonant capacitance C3 that is parallel between this fluorescent lamp two ends filament; The elementary winding of this magnetic ring transformer L2 is connected in series through this fluorescent lamp one end filament and this resonant capacitance C3; This resonant capacitance C3 is connected with the C2 common port with this two capacitor C 1 through this fluorescent lamp other end filament, and this two capacitor C 1 is connected to this DC power supply anode respectively with the C2 other end and holds over the ground.In order to guarantee that triode is in the normally state, so all be connected in series corresponding resistor (as shown in Figure 4) on the base stage of all triodes and the emitter, be connected in series diode D4 between this resistance R 1 and bidirectional diode D2 common port and this triode G1 emitter simultaneously.
Under the working condition, after energized, the direct voltage VDC of this rectifier filter output charges to starting capacitor C through resistance R 1; This charging capacitor C voltage rise height that powers on; After its voltage surpassed bidirectional diode D2 breakover voltage, this bidirectional diode D2 punctured conducting, and had electric current to flow into the base stage of G2; Make the G2 conducting, at this moment collector electrode → ground of current flow path VDC → C1 → filament → C3 → filament → inductance L → magnetic ring transformer L2 second subprime winding L 22 → G2.The growth trend of G2 collector current produces induced electromotive force in twice level winding L of magnetic ring transformer L2 21 with L22; Its polarity be have on the winding ". " for end of the same name for just; Thereby the collector current of G2 is increased suddenly because of positive feedback; Saturated up to G2, the induced potential on L21 and the L22 is descended, the base potential of G2 is descended.Because the polarity (end of the same name) of G1 base stage is opposite with G2, the G1 base voltage raises, and makes G2 progress into cut-off state from saturation condition like this.And G1 gets into conducting state from cut-off state, its flow of current path G1 collector electrode → elementary winding → inductance L 1 → filament of magnetic ring transformer L2 → C3 → filament → C2 → ground, and very fast G1 gets into saturation condition.Like this G1 and G2 alternate conduction and by and vibrate.When in case the voltage on the C3 reaches the ignition voltage of fluorescent tube, the fluorescent tube ignition trigger.
Because fluorescent tube performance change (as aging) makes driving tube G1 and the temperature rise of G2 pipe; The resistance of the thermistor RT that installs between it descends, and makes the dividing potential drop of voltage on load resistance R3 of exporting on inductance L 1 secondary winding raise, and this voltage raises with the temperature rise of power tube pipe; After being elevated to bidirectional diode pipe D1 thresholding trigger voltage; D1 conducting and trigger controllable silicon D3 and transistor G3 conducting, as long as this controllable silicon D3 anode current is greater than keeping electric current, this controllable silicon D3 and transistor G3 remain conducting state; So just making startup capacitor C go up voltage sets up not; Can not make bidirectional diode pipe D2 conducting, make half-bridge drive circuit can not trigger starting of oscillation and the transistorized conducting of G3 just can not effective feedback be kept vibration, this state keeps (latching) to just end of outage always.Two triodes in this half-bridge drive circuit have been protected thus.
Claims (5)
1. auto-excitation type electric ballast with overtemperature prote; Comprise the current rectifying and wave filtering circuit, half-bridge drive circuit and the output circuit that connect successively; It is characterized in that; Be connected to the overtemperature prote circuit between this output circuit and this half-bridge drive circuit; Triode (G3) collector and emitter is parallel to the base stage and the emitter of a triode (G2) in this half-bridge drive circuit respectively in this overtemperature prote circuit; Triode (G3) base stage is connected to one-way SCR (D3) negative electrode in this overtemperature prote circuit, and this one-way SCR (D3) anode is connected to and starts electric capacity (C) charging voltage end in this half-bridge drive circuit, and this one-way SCR (D3) trigger end is connected to overtemperature testing circuit output through bidirectional diode (D1); This overtemperature testing circuit for successively the series connection inductance (L1) secondary winding, diode (D5), have negative tempperature coefficient thermistor (RT), divider resistance (R3); This inductance (L1) secondary winding other end ground connection, this thermistor (RT) and divider resistance (R3) common port are connected to the input of bidirectional diode (D1) in this overtemperature prote circuit, and the parallelly connected electrochemical capacitor of this divider resistance (R3) (C5); This inductance (L1) is series between this half-bridge drive circuit and the output circuit, and this thermistor (RT) is arranged between two triodes (G1, G2) the collector electrode fin in this half-bridge drive circuit.
2. the auto-excitation type electric ballast with overtemperature prote according to claim 1; It is characterized in that; Resistance (R2) is proofreaied and correct in thermistor (RT) parallel connection in this overtemperature testing circuit; This resistance of proofreading and correct resistance (R2) is more than a times of this thermistor (RT) normal temperature resistance, and this thermistor (RT) high temperature resistance descends more than one times.
3. the auto-excitation type electric ballast with overtemperature prote according to claim 1 is characterized in that, this thermistor (RT) is fixed between two triodes (G1, G2) the collector electrode fin in this half-bridge drive circuit through thermal paper.
4. the auto-excitation type electric ballast with overtemperature prote according to claim 1 is characterized in that, the DC power supply anode of this current rectifying and wave filtering circuit output and over the ground between also be connected to circuit of power factor correction.
5. the auto-excitation type electric ballast with overtemperature prote according to claim 1; It is characterized in that; This output circuit is made up of with C2 with two capacitor C 1 that are connected into passive leg the resonant capacitance C3 that is parallel between the filament of fluorescent lamp two ends; This resonant capacitance C3 is connected with the elementary windings in series of magnetic ring transformer L2 of half-bridge drive circuit output through this fluorescent lamp one end filament; Be connected with the C2 common port with this two capacitor C 1 through this fluorescent lamp other end filament again simultaneously, and this two capacitor C 1 is connected to the DC power supply anode respectively with the C2 other end and holds over the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100212236A CN101287323B (en) | 2007-04-13 | 2007-04-13 | Auto-excitation type electronic ballast with over-temperature protection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100212236A CN101287323B (en) | 2007-04-13 | 2007-04-13 | Auto-excitation type electronic ballast with over-temperature protection function |
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| CN101287323A CN101287323A (en) | 2008-10-15 |
| CN101287323B true CN101287323B (en) | 2012-01-25 |
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| CN101711074B (en) * | 2009-09-04 | 2013-05-08 | 海洋王照明科技股份有限公司 | Light-emitting device |
| CN102163833A (en) * | 2011-01-21 | 2011-08-24 | 佛山市伟照业光电节能有限公司 | Extension-type electrical ballast magnetic induction protector |
| CN102762020B (en) * | 2011-04-29 | 2015-03-25 | 海洋王照明科技股份有限公司 | Fluorescent lamp and open circuit protecting circuit thereof |
| CN202231896U (en) * | 2011-05-20 | 2012-05-23 | 中山市华艺灯饰照明股份有限公司 | Large-power LED (Light-Emitting Diode) drive power source |
| CN102833929B (en) * | 2011-06-17 | 2015-04-22 | 海洋王照明科技股份有限公司 | Self-ballasted fluorescent lamp and open loop protection circuit thereof |
| CN106163025B (en) * | 2015-03-19 | 2018-09-07 | 李少华 | A kind of electronic ballast protecting circuit |
| CN106668920A (en) * | 2016-12-12 | 2017-05-17 | 东莞市志诚电器有限公司 | Multifunctional sterilizing and washing integrated machine |
| CN113899463B (en) * | 2021-12-10 | 2022-04-19 | 如果科技有限公司 | Temperature sampling correction circuit, temperature sampling device and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2128817Y (en) * | 1992-05-16 | 1993-03-24 | 刘寿生 | Fluorescent lamp electronic ballast |
| US5321337A (en) * | 1992-11-12 | 1994-06-14 | Everay Electronic Co., Ltd. | Ballast having starting current restraint circuitry for preventing a large in-rush current and protection circuitry for preventing damage due to a start-up failure |
| US5436529A (en) * | 1993-02-01 | 1995-07-25 | Bobel; Andrzej A. | Control and protection circuit for electronic ballast |
| US5710489A (en) * | 1982-08-25 | 1998-01-20 | Nilssen; Ole K. | Overvoltage and thermally protected electronic ballast |
| CN201054855Y (en) * | 2007-04-13 | 2008-04-30 | 苏州市昆士莱照明科技有限公司 | Self-excited electronic rectifier with ultra-temperature protection |
-
2007
- 2007-04-13 CN CN2007100212236A patent/CN101287323B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710489A (en) * | 1982-08-25 | 1998-01-20 | Nilssen; Ole K. | Overvoltage and thermally protected electronic ballast |
| CN2128817Y (en) * | 1992-05-16 | 1993-03-24 | 刘寿生 | Fluorescent lamp electronic ballast |
| US5321337A (en) * | 1992-11-12 | 1994-06-14 | Everay Electronic Co., Ltd. | Ballast having starting current restraint circuitry for preventing a large in-rush current and protection circuitry for preventing damage due to a start-up failure |
| US5436529A (en) * | 1993-02-01 | 1995-07-25 | Bobel; Andrzej A. | Control and protection circuit for electronic ballast |
| CN201054855Y (en) * | 2007-04-13 | 2008-04-30 | 苏州市昆士莱照明科技有限公司 | Self-excited electronic rectifier with ultra-temperature protection |
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| CN101287323A (en) | 2008-10-15 |
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