CN101336031A - Electronic ballast of metal halogenate lamp for projector - Google Patents
Electronic ballast of metal halogenate lamp for projector Download PDFInfo
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- CN101336031A CN101336031A CNA2008100646494A CN200810064649A CN101336031A CN 101336031 A CN101336031 A CN 101336031A CN A2008100646494 A CNA2008100646494 A CN A2008100646494A CN 200810064649 A CN200810064649 A CN 200810064649A CN 101336031 A CN101336031 A CN 101336031A
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Abstract
The invention relates to an electronic ballast of a metal halide lamp used in a projector, particularly to a common metal halide lamp, to solve the problems that the common electronic ballast only realizes arched electric arc without causing to be projector light source. According to the invention, an EMC circuit, a rectifier circuit, an active power factor correcting circuit, a Class D resonance half bridge inverter circuit, invert link net input current and a light voltage signal sampling circuit, a SCM, a high frequency driving circuit are connected in series, two output ends of the high frequency driving circuit are connected with two control ends of the Class D resonance half bridge inverter circuit, and remote control signals are connected with SCM through the remote control signal interface circuit. The Class D resonance half bridge inverter circuit is composed of a bridge arm and a resonance network connected in series. Timer overflow trap is inhibited through software setting inside the SCM. Power regulation of the SCM and closed loop are completed through detecting the bus net input current of the Class D resonance half bridge inverter circuit.
Description
Technical field
The present invention relates to a kind of electric ballast that is used for common halide lamp, especially be applied to the projecting apparatus field.
Background technology
Metal halide lamp is that colour temperature is near the electric light source of daylight, the point-source of light of present most of projecting apparatus adopts the extremely short metal halide lamp of electric arc spacing, as UPE, UHP, xenon lamp etc., but the electric arc spacing is extremely lacked (1.0/1.3/1.45mm), and working life is short, and brightness decay is very serious in the use, net cycle time after 1000 hours the projected image effect generally can also accept reluctantly, continue to use the image of the projection of going down just disgusting again; The mode of lighting a lamp of the electric ballast that adopts mostly is the low-frequency ac circuit and square-wave greatly.
The lamp distance between electrodes of common metal halide lamp is all long, the metal halide lamp distance between electrodes of 70W is 4mm, the metal halide lamp distance between electrodes of 100W is greater than 5mm, the metal halide lamp distance between electrodes of 150W is near 10mm, as long as common metal halide lamp electronic ballast satisfies the lamp arc stability, it is just passable to reach rated power.Because it is the length of electric arc is greater than 10mm,, little for drop shadow effect's influence even electrode erosion surpasses 1mm.
How can be applied to projecting apparatus by the common metal halide lamp that electrode distance is long, mainly be electric arc to be made points of proximity light source.The electric arc of common metal halide lamp generally presents arch, and certain bending arranged, such small distance is a kind of line source in the narrow and small chamber of projecting apparatus, if that electric arc can be done is straight and upright and full, be the light source that can be used as projecting apparatus fully, at this moment can think the area source of approximate point-source of light.
But the electric ballast that is used for the common metal halide lamp at present can only be realized arch electric arc, can't satisfy the requirement of point-source of light; Be used for particulate metal halide lamp (as UPE, UHP, xenon lamp etc.) the electric ballast mode of lighting a lamp be the low-frequency ac circuit and square-wave mostly, not only control procedure complexity, cost height, and can't drive common metal halide lamp and make it become the area source of approximate point-source of light.
Summary of the invention
The electric ballast that the objective of the invention is to solve the common metal halide lamp can only be realized arch electric arc, can not make it become the problem of the light source that projecting apparatus uses, and a kind of electric ballast that makes common Metal halogen lamp as the light source of projecting apparatus is provided.
The present invention includes the EMC circuit, rectifier circuit, APFC, clean input current of inversion link and lamp voltage signal sample circuit, remote signal interface circuit and high frequency drive circuit, it also comprises single-chip microcomputer and Class D class resonance oscillation semi-bridge inverter circuit, the output of EMC circuit links to each other with the input of rectifier circuit, the output of rectifier circuit links to each other with the input of APFC, the output of APFC links to each other with the input of Class D class resonance oscillation semi-bridge inverter circuit, the output of Class D class resonance oscillation semi-bridge inverter circuit links to each other with the input of clean input current of inversion link and lamp voltage signal sample circuit, the output of clean input current of inversion link and lamp voltage signal sample circuit links to each other with an input of single-chip microcomputer, the output of single-chip microcomputer links to each other with the input of high frequency drive circuit, two outputs of high frequency drive circuit link to each other with two control ends of Class D class resonance oscillation semi-bridge inverter circuit respectively, and remote signal links to each other with another input of single-chip microcomputer through the remote signal interface circuit;
Class D class resonance oscillation semi-bridge inverter circuit is made up of brachium pontis, resonant network, three inputs of brachium pontis are respectively as an input and two control ends of Class D class resonance oscillation semi-bridge inverter circuit, the output of brachium pontis links to each other with the input of resonant network, and the output of resonant network is as the output of Class D class resonance oscillation semi-bridge inverter circuit;
Single-chip microcomputer inside is overflowed interrupt inhibit by software setting with timer, by detecting the clean input current of bus of Class D class resonance oscillation semi-bridge inverter circuit, finish the power adjustments and the closed loop of single-chip microcomputer, just can think when the clean input current of the bus that records that lamp load short circuit or open circuit, open fault also detect with the lamp terminal voltage simultaneously during less than a certain set point judges.Lamp power had 10% overshoot before entering stable state rated power.
Operation principle:
Single-chip microcomputer 1 of the present invention provides PFM (pulse frequency modulated) drive signal of 150kHz～200kHz, 150kHz～200kHz is the window of the no acoustic resonance that the experiment proved that, single-chip microcomputer 1 sends high-frequency driving signal and does not adopt timer to overflow interruption, in case detecting power needs to regulate, need to change frequency, the new cycle that just will calculate and pulsewidth digital value register write cycle and pulse width register.Directly do not carry out frequency adjustment because there being to adopt the adjusting of response cycle and pulsewidth in interruption, therefore, under high frequency, one two cycle overall height or complete low improper drive signal may appear in the drive signal of single-chip microcomputer output after regulating, but owing to be under high frequency, therefore can not cause the problem of arc extinction, can not produce the straight-through problem of half-bridge yet, but but can produce a bigger electric current, under the situation that the power switch pipe capacity guarantees, to not influence of reliability.The present invention has made full use of this overall height just and complete low improper drive signal obtains the condition that big rush of current is broken the formation of arch electric arc, obtains full straight and upright electric arc.Therefore this heavy current impact at random is to guarantee one of condition that arc shape is full.
The bus current of the clean input current of inversion link and lamp voltage signal sample circuit 6 sampling Class D class resonance oscillation semi-bridge inverter circuits 2, and obtain to be input to only electric current in the Class D class resonance oscillation semi-bridge inverter circuit 2 by filtering.Because the resistance in the Class D class resonance oscillation semi-bridge inverter circuit 2 can be ignored, the product of this electric current and busbar voltage can be thought the active power that metal halide lamp 9 consumes, therefore, we detect the power that above clean input current in fact just is equivalent to detect metal halide lamp 9, also and then can the adjusting by frequency realize the adjusting and the closed-loop control of the power of metal halide lamp 9.Making metal halide lamp 9 overshoot of 10W occur before stable state by the control to the power of metal halide lamp 9, also is to obtain one of full condition of arc shape.
Advantage of the present invention is: by 1, adopt the power closed-loop adjustment to lamp, hyperharmonic 2, the employing high-frequency drive of utilizing lamp before stable state, to occur, utilize heavy current impact mode at random, make the common metal halide lamp can become the area source of the approximate point-source of light that is used for projecting apparatus, cinematographic projector etc.
Description of drawings
Fig. 1 is a structural representation of the present invention, and Fig. 2 is the high frequency drive circuit structural representation.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, present embodiment is by single-chip microcomputer 1, Class D class resonance oscillation semi-bridge inverter circuit 2, MC circuit 3, rectifier circuit 4, APFC 5, clean input current of inversion link and lamp voltage signal sample circuit 6, remote signal interface circuit 7 and high frequency drive circuit 8 are formed, the output of EMC circuit 3 links to each other with the input of rectifier circuit 4, the output of rectifier circuit 4 links to each other with the input of APFC 5, the output of APFC 5 links to each other with the input of Class D class resonance oscillation semi-bridge inverter circuit 2, the output of Class D class resonance oscillation semi-bridge inverter circuit 2 links to each other with the input of clean input current of inversion link and lamp voltage signal sample circuit 6, the output of clean input current of inversion link and lamp voltage signal sample circuit 6 links to each other with an input of single-chip microcomputer 1, the output of single-chip microcomputer 1 links to each other with the input of high frequency drive circuit 8, two outputs of high frequency drive circuit 8 link to each other with two control ends of Class D class resonance oscillation semi-bridge inverter circuit 2 respectively, and remote signal links to each other with another input of single-chip microcomputer 1 through remote signal interface circuit 7;
Class D class resonance oscillation semi-bridge inverter circuit 2 is made up of brachium pontis 2-1, resonant network 2-2, three inputs of brachium pontis 2-1 are respectively as an input and two control ends of Class D class resonance oscillation semi-bridge inverter circuit 2, the output of brachium pontis 2-1 links to each other with the input of resonant network 2-2, and the output of resonant network 2-2 is as the output of Class D class resonance oscillation semi-bridge inverter circuit 2;
Single-chip microcomputer 1 inside is overflowed interrupt inhibit by software setting with timer, by detecting the clean input current of bus of Class D class resonance oscillation semi-bridge inverter circuit 2, finish the power adjustments and the closed loop of single-chip microcomputer 1, just can think when the clean input current of the bus that records that lamp 9 load short circuits or open circuit, open fault also detect with lamp 9 terminal voltages simultaneously during less than a certain set point judges.Lamp power had 10% overshoot before entering stable state rated power.
EMC: be the abbreviation of Electromagnetic Compatibility, i.e. electromagnetic compatibility.Be meant that electronic equipment or network system have the ability of certain opposing electromagnetic interference, can not produce excessive electromagnetic interference simultaneously.That is to say, require this equipment or network system can be in more abominable electromagnetic environment operate as normal, can not produce excessive electromagnetic interference to the operate as normal of miscellaneous equipment and network on every side by conduction or radiation again simultaneously.
It is the single-chip microcomputer of MC68HC908KX8 or PIC16F690 that single-chip microcomputer 1 can be selected model for use, also can select the single-chip microcomputer of other types for use, and its resource should comprise pulse-width modulation (PWM) output and ADC module;
EMC circuit 3: stop that ballast disturbs the conductibility of electrical network and mains by harmonics to the interference of ballast; Improve the defensive ability/resistance ability of ballast to surging signal and thunderbolt;
Rectification circuit 4: obtain the direct voltage of 100Hz, its pulsating waveform provides the waveform reference for power factor correction;
APFC 5: eliminate the current harmonics that current rectifying and wave filtering circuit causes, improve power factor, and provide constant busbar voltage for the inversion link of back level.Thereby avoided the problem of lamp power following power network fluctuation;
Clean input current of inversion link and lamp voltage signal sample circuit 6: obtain bus to the sampling of the clean input current of inversion half-bridge and active current component signal and then know the information of the active power that the inversion half-bridge consumes; Obtain lamp terminal voltage information, thereby can carry out error protections such as whether bright judgement affirmation of lamp and open circuit short circuit;
Remote signal interface 7: receive remote controller signal, realize the purpose of light modulation and switch-mode ballast.
Embodiment two: below in conjunction with Fig. 1 present embodiment is described, present embodiment Class D class resonance oscillation semi-bridge inverter circuit 2 is made up of brachium pontis 2-1, resonant network 2-2;
Brachium pontis 2-1 is by the first power switch pipe Q1, the second power switch pipe Q2 and first resistance R 1 are formed, the source electrode of the first power switch pipe Q1 links to each other with the drain electrode of the second power switch pipe Q2, the source electrode of the second power switch pipe Q2 links to each other with first resistance R 1, the other end of the drain electrode of the first power switch pipe Q1 and first resistance R 1 is as the input of Class D class resonance oscillation semi-bridge inverter circuit 2, the source electrode of the grid of the first power switch pipe Q1 and the first power switch pipe Q1 is as a control end of Class D class resonance oscillation semi-bridge inverter circuit 2, the source electrode of the grid of the second power switch pipe Q2 and the second power switch pipe Q2 is as another control end of ClassD class resonance oscillation semi-bridge inverter circuit 2, the source electrode of the first power switch pipe Q1, the other end of first resistance R 1 is as the output of brachium pontis 2-1;
Resonant network 2-2 is made up of first capacitor C 1, second capacitor C 2, first winding L 1, one end of one end of first capacitor C 1 and second capacitor C 2 is as the input of resonant network 2-2, the other end of first capacitor C 1 links to each other with an end of first winding L 1, and the other end of first winding L 1 links to each other with the other end of second capacitor C 2 and as the output of resonant network 2-2;
One end of first resistance R 1 and the other end of second capacitor C 2 are as the output of Class D class resonance oscillation semi-bridge inverter circuit 2;
Embodiment three: present embodiment is described below in conjunction with Fig. 2, be that high frequency drive circuit 2 is made up of accelerating circuit 8-1, power driving circuit 8-2, transformer 8-3, Q1 drive circuit 8-4, Q2 drive circuit 8-5 outside present embodiment and execution mode one different:
Accelerating circuit 8-1 is made up of second resistance R 2 and the 3rd capacitor C 3, and an end of second resistance R 2 is as the input of accelerating circuit 8-1, and the other end of second resistance R 2 is as the output of accelerating circuit 8-1, and the 3rd capacitor C 3 is connected in parallel on the two ends of second resistance R 2;
Power driving circuit 8-2 is by the 3rd resistance R 3, the 4th resistance R 4, the first triode T1, the second triode T2, the 3rd triode T3 and the 4th capacitor C 4 are formed, the base stage of the first triode T1 is as the input of power driving circuit 8-2, the grounded emitter of the first triode T1, the collector electrode of the first triode T1 connects an end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 links to each other with power supply, the collector electrode of the first triode T1 also links to each other with an end of the 4th resistance R 4, the other end of the 4th resistance R 4 links to each other with the base stage of the second triode T2 base stage and the 3rd triode T3, the collector electrode of the second triode T2 links to each other with power supply, the grounded collector of the 3rd triode T3, the emitter of the emitting stage of the second triode T2 and the 3rd triode T3 links to each other and links to each other with an end of the 4th capacitor C 4, and the other end of the 4th capacitor C 4 is as the output of power driving circuit 8-2;
Transformer 8-3 is made up of second winding L 2, tertiary winding L3 and the 4th winding L 4, one end of second winding L 2 is as the input of transformer 8-3, the other end ground connection of second winding L 2, tertiary winding L3 is as the output of transformer 8-3, and the 4th winding L 4 is as another output of transformer 8-3;
Q1 drive circuit 8-4 is made up of the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first diode D1, the first voltage-stabiliser tube D3 and the 4th triode T4, one end of the 5th resistance R 5 is as the input of Q1 drive circuit 8-4, and the other end of the 5th resistance R 5 links to each other with the negative electrode of the collector electrode of the 4th triode T4 and the first voltage-stabiliser tube D3 and simultaneously as the output of Q1 drive circuit 8-4; The negative electrode of the first diode D1 is connected with an end of the 6th resistance R 6 and as another input of Q1 drive circuit 8-4, the anode of the first diode D1 links to each other with the anode of the emitter of the 7th resistance R 7, the 4th triode T4 and the first voltage-stabiliser tube D3 simultaneously and as another output of Q1 drive circuit 8-4, the other end while of the 7th resistance R 7 links to each other with the base stage of the 4th triode T4 and the other end of the 6th resistance R 6;
Q2 drive circuit 8-5 is made up of the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the second diode D2, the second voltage-stabiliser tube D4 and the 5th triode T5, one end of the 8th resistance R 8 is as the input of Q2 drive circuit 8-5, and the other end of the 8th resistance R 8 links to each other with the negative electrode of the collector electrode of the 5th triode T5 and the second voltage-stabiliser tube D4 and simultaneously as the output of Q2 drive circuit 8-5; The negative electrode of the second diode D2 is connected with an end of the 9th resistance R 9 and as another input of Q2 drive circuit 8-5, the anode of the second diode D2 links to each other with the anode of the emitter of the tenth resistance R 10, the 5th triode T5 and the second voltage-stabiliser tube D4 simultaneously and as another output of Q2 drive circuit 8-5, the other end while of the tenth resistance R 10 links to each other with the base stage of the 5th triode T5 and the other end of the 9th resistance R 9;
Metal halide lamp be colour temperature near the electric light source of daylight, the condition that metal halide lamp becomes projecting apparatus, cinematographic projector etc. and need light source is 1, no acoustic resonance, stable lighting a lamp; 2, electric arc is straight and upright and full.
Be used for the metal halide lamp that great majority adopt the electric arc spacing extremely to lack on projecting apparatus, the cinematographic projector at present, as UPE, UHP, xenon lamp etc., the mode of lighting a lamp that adopts mostly is the low-frequency square-wave circuit greatly, can effectively avoid acoustic resonance like this, present consistent technology maturation of lighting a lamp, this patent adopts high-frequency circuit, the selected frequency interval is 150kHz～200kHz, the experiment proved that, this interval is noiseless resonance window, and can make common Metal halogen lamp satisfy the requirement of projecting apparatus with light source by control.
Because the electric arc spacing of particulate metal halide lamps such as UPE is extremely short, between 1.0mm～1.45mm, interpolar does not have electric arc, be similar to a little, be particularly suitable for doing point-source of light, what this patent adopted is the big common metal halide lamp of electric arc spacing, after lighting a lamp, the electric arc of arch appears in interpolar, is linear, is can not be as projecting apparatus as not special processing, the cinematographic projector light source, we adopt the heavy current impact mode near random fashion, make electric arc full, straight and upright, become the area source of an approximate point-source of light, can satisfy projecting apparatus, the requirement of the required light source of cinematographic projector.
In the process of lighting a lamp after lamp is bright, bigger rush of current at random can appear, and ingoing power closed loop or full power have the power overshoot of 10-15% before, electric current also can be because of the adjusting of frequency during the power closed loop, be subjected to the program control of single-chip microcomputer 1 and irregular heavy current impact occurs, these heavy current impacts at random can make electric arc present the full shape of cydariform just.The control core adopts single-chip microcomputer, the 50% duty ratio high-frequency driving signal PFM that single-chip microcomputer 1 sends is through second resistance R 2, the acceleration drive circuit 8-1 that the 3rd capacitor C 3 is formed, be connected to the base stage of the first triode T1 of NPN type, by the 3rd resistance R 3 signal voltage is promoted to 15V, drive the composite construction that the 3rd triode T3 by the second triode T2 of positive-negative-positive and NPN type forms afterwards, by the common emitter node of composite construction through transformer TR every straight the 4th capacitor C 4 driving pulses, two secondary are output as the two-way complementary signal, drive two the power MOS switch tube Q1 and the Q2 of half-bridge through treatment circuit.When the composite construction common emitter is output as timing, the grid source electrode parasitic capacitance quick charge that voltage is given power MOS switch tube Q1 through the 5th resistance R 5, the first diode D1 in the treatment circuit of top, Q1 is opened in driving, and driving voltage is by the first voltage-stabiliser tube D3 amplitude limit between the collector and emitter that is parallel to the 4th triode T4.When the composite construction common emitter of the second triode T2 and the 3rd triode T3 composition is output as 0, because it is negative just down on the parasitic capacitance between the grid source electrode of MOS switching tube Q1, just upward negative electromotive force can produce on the base stage of the 4th triode T4 by the 6th resistance R 6, the 7th resistance R 7 and the 5th resistance R 5 of series connection and make the saturated signal of the 4th triode T4 under the tertiary winding L3 of Q1 drive circuit 8-4, thereby is the grid source capacitance creation repid discharge loop of Q1.Behind the grid source capacitance discharge off, the voltage between the grid source electrode is about forward conduction tube voltage drop-0.6V of the first voltage-stabiliser tube D3.The operation principle of another secondary is the signal complementation similarly.
The PFM signal of the pulse frequency modulated of single-chip microcomputer 1 output, be used for the power adjustments and the closed-loop control of metal halide lamp 9 through high frequency drive circuit 1, if the PFM signal that single-chip microcomputer 1 is sent is stably when frequency adjustment, it also is stably that the switching frequency of Class D class resonance oscillation semi-bridge inverter circuit 2 is regulated.So the variation of electric current also is stably before and after each the adjusting, does not have the impact of electric current, the shape of electric arc generally is an arch like this, and is not full, can not be as the light source of projecting apparatus.
In order to guarantee the full of arc shape, make it can be used in the light source of projecting apparatus, we have adopted the heavy current impact mode near random fashion, its implementation: the present invention adopts PFM (pulse frequency modulated) drive signal of single-chip microcomputer 1 output 150kHz～200kHz to carry out the power closed-loop adjustment, single-chip microcomputer 1 sends high-frequency driving signal and does not adopt and can guarantee that the reliable timer of frequency adjustment overflows interruption, in case detecting power needs to regulate, need to change frequency, the new cycle that just will calculate and pulsewidth digital value register write cycle and pulse width register.Directly do not carry out frequency adjustment because there being to adopt the adjusting of response cycle and pulsewidth in interruption, therefore, under high frequency, one two cycle overall height or complete low improper drive signal may appear in the drive signal of single-chip microcomputer output after regulating, but owing to be under high frequency, therefore can not cause the problem of arc extinction, can not produce the straight-through problem of half-bridge yet, but but can produce a bigger electric current, under the situation that the power switch pipe capacity guarantees, to not influence of reliability.The present invention has made full use of this overall height just and complete low improper drive signal obtains the condition that big rush of current is broken the formation of arch electric arc, obtains full straight and upright electric arc.Therefore this heavy current impact at random is to guarantee one of condition that arc shape is full.
Two signals of the clean input current of inversion link and lamp voltage signal sample circuit 6 samplings: 1, the i.e. node current that links to each other with first resistance R 1 of the source electrode of the first power switch pipe Q1 of the bus current of Class D class resonance oscillation semi-bridge inverter circuit 2, and be input to electric current in the Class D class resonance oscillation semi-bridge inverter circuit 2 only by the filtering acquisition; 2, lamp terminal voltage, the i.e. contact voltage that links to each other with first winding L 1 of second capacitor C 2, because first resistance R 1 in the Class D class resonance oscillation semi-bridge inverter circuit 2 can be ignored, the product of this electric current and lamp terminal voltage can be thought the active power that metal halide lamp 9 consumes, therefore, we detect the power that above clean input current in fact just is equivalent to detect metal halide lamp 9, also and then can the adjusting by frequency realize the adjusting and the closed-loop control of the power of metal halide lamp 9.Making metal halide lamp 9 overshoot of 10W occur before stable state by the control to the power of metal halide lamp 9, also is to obtain one of full condition of arc shape.
Claims (10)
1, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus, it comprises EMC circuit (3), rectifier circuit (4), APFC (5), clean input current of inversion link and lamp voltage signal sample circuit (6), remote signal interface circuit (7) and high frequency drive circuit (8), it also comprises single-chip microcomputer (1) and Class D class resonance oscillation semi-bridge inverter circuit (2), the output of EMC circuit (3) links to each other with the input of rectifier circuit (4), the output of rectifier circuit (4) links to each other with the input of APFC (5), the output of APFC (5) links to each other with the input of Class D class resonance oscillation semi-bridge inverter circuit (2), the output of Class D class resonance oscillation semi-bridge inverter circuit (2) links to each other with the input of the clean input current of inversion link with lamp voltage signal sample circuit (6), the output of clean input current of inversion link and lamp voltage signal sample circuit (6) links to each other with an input of single-chip microcomputer (1), the output of single-chip microcomputer (1) links to each other with the input of high frequency drive circuit (8), two outputs of high frequency drive circuit (8) link to each other with two control ends of Class D class resonance oscillation semi-bridge inverter circuit (2) respectively, and remote signal links to each other through remote signal interface circuit (7) another input with single-chip microcomputer (1);
Class D class resonance oscillation semi-bridge inverter circuit (2) is made up of brachium pontis (2-1), resonant network (2-2), three inputs of brachium pontis (2-1) are respectively as an input and two control ends of Class D class resonance oscillation semi-bridge inverter circuit (2), the output of brachium pontis (2-1) links to each other with the input of resonant network (2-2), and the output of resonant network (2-2) is as the output of Class D class resonance oscillation semi-bridge inverter circuit (2);
Single-chip microcomputer (1) is inner to overflow interrupt inhibit by software setting with timer, by detecting the clean input current of bus of Class D class resonance oscillation semi-bridge inverter circuit (2), finish the power adjustments and the closed loop of single-chip microcomputer (1), when the clean input current of the bus that records just can think that lamp (9) load short circuits or open circuit, open fault also use lamp (9) terminal voltage to detect simultaneously and judge during less than a certain set point.Lamp power had 10% overshoot before entering stable state rated power.
2, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 1 is characterized in that it is that the single-chip microcomputer of MC68HC908KX8, PIC16F690 or other have the single-chip microcomputer of pulse-width modulation output and ADC module that single-chip microcomputer (1) is selected model for use.
3, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 1, it is characterized in that brachium pontis (2-1) is by the first power switch pipe Q1, the second power switch pipe Q2 and first resistance R 1 are formed, the source electrode of the first power switch pipe Q1 links to each other with the drain electrode of the second power switch pipe Q2, the source electrode of the second power switch pipe Q2 links to each other with first resistance R 1, the other end of the drain electrode of the first power switch pipe Q1 and first resistance R 1 is as the input of Class D class resonance oscillation semi-bridge inverter circuit (2), the source electrode of the grid of the first power switch pipe Q1 and the first power switch pipe Q1 is as a control end of Class D class resonance oscillation semi-bridge inverter circuit (2), the source electrode of the grid of the second power switch pipe Q2 and the second power switch pipe Q2 is as another control end of Class D class resonance oscillation semi-bridge inverter circuit (2), the source electrode of the first power switch pipe Q1, the other end of first resistance R 1 is as the output of brachium pontis (2-1).
4, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 1, it is characterized in that resonant network (2-2) is made up of first capacitor C 1, second capacitor C 2, first winding L 1, one end of one end of first capacitor C 1 and second capacitor C 2 is as the input of resonant network (2-2), the other end of first capacitor C 1 links to each other with an end of first winding L 1, and the other end of first winding L 1 links to each other with the other end of second capacitor C 2 and as the output of resonant network (2-2).
5, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 1 is characterized in that high frequency drive circuit (8) is made up of accelerating circuit (8-1), driving power amplifying circuit (8-2), transformer (8-3), Q1 drive circuit (8-4) and Q2 drive circuit (8-5).
6, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 5, it is characterized in that accelerating circuit (8-1) is made up of second resistance R 2 and the 3rd capacitor C 3, one end of second resistance R 2 is as the input of accelerating circuit (8-1), the other end of second resistance R 2 is as the output of accelerating circuit (8-1), and the 3rd capacitor C 3 is connected in parallel on the two ends of second resistance R 2.
7, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 5, it is characterized in that power driving circuit (8-2) is by the 3rd resistance R 3, the 4th resistance R 4, the first triode T1, the second triode T2, the 3rd triode T3 and the 4th capacitor C 4 are formed, the base stage of the first triode T1 is as the input of power driving circuit (8-2), the grounded emitter of the first triode T1, the collector electrode of the first triode T1 connects an end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 links to each other with power supply, the collector electrode of the first triode T1 also links to each other with an end of the 4th resistance R 4, the other end of the 4th resistance R 4 links to each other with the base stage of the second triode T2 base stage and the 3rd triode T3, the collector electrode of the second triode T2 links to each other with power supply, the grounded collector of the 3rd triode T3, the emitter of the emitting stage of the second triode T2 and the 3rd triode T3 links to each other and links to each other with an end of the 4th capacitor C 4, and the other end of the 4th capacitor C 4 is as the output of power driving circuit (8-2).
8, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 5, it is characterized in that transformer (8-3) is made up of second winding L 2, tertiary winding L3 and the 4th winding L 4, one end of second winding L 2 is as the input of transformer (8-3), the other end ground connection of second winding L 2, tertiary winding L3 is as an output of transformer (8-3), and the 4th winding L 4 is as another output of transformer (8-3).
9, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 5, it is characterized in that Q1 drive circuit (8-4) is made up of the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first diode D1, the first voltage-stabiliser tube D3 and the 4th triode T4, one end of the 5th resistance R 5 is as an input of Q1 drive circuit (8-4), and the other end of the 5th resistance R 5 links to each other with the negative electrode of the collector electrode of the 4th triode T4 and the first voltage-stabiliser tube D3 and simultaneously as an output of Q1 drive circuit (8-4); The negative electrode of the first diode D1 is connected with an end of the 6th resistance R 6 and as another input of Q1 drive circuit (8-4), the anode of the first diode D1 links to each other with the anode of the emitter of the 7th resistance R 7, the 4th triode T4 and the first voltage-stabiliser tube D3 simultaneously and as another output of Q1 drive circuit (8-4), the other end while of the 7th resistance R 7 links to each other with the base stage of the 4th triode T4 and the other end of the 6th resistance R 6.
10, a kind of electric ballast that is used for the metal halide lamp of projecting apparatus according to claim 5, it is characterized in that Q2 drive circuit (8-5) is made up of the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the second diode D2, the second voltage-stabiliser tube D4 and the 5th triode T5, one end of the 8th resistance R 8 is as an input of Q2 drive circuit (8-5), and the other end of the 8th resistance R 8 links to each other with the negative electrode of the collector electrode of the 5th triode T5 and the second voltage-stabiliser tube D4 and simultaneously as an output of Q2 drive circuit (8-5); The negative electrode of the second diode D2 is connected with an end of the 9th resistance R 9 and as another input of Q2 drive circuit (8-5), the anode of the second diode D2 links to each other with the anode of the emitter of the tenth resistance R 10, the 5th triode T5 and the second voltage-stabiliser tube D4 simultaneously and as another output of Q2 drive circuit (8-5), the other end while of the tenth resistance R 10 links to each other with the base stage of the 5th triode T5 and the other end of the 9th resistance R 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100646494A CN101336031B (en) | 2008-06-02 | 2008-06-02 | Electronic ballast of metal halogenate lamp for projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100646494A CN101336031B (en) | 2008-06-02 | 2008-06-02 | Electronic ballast of metal halogenate lamp for projector |
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| CN101336031A true CN101336031A (en) | 2008-12-31 |
| CN101336031B CN101336031B (en) | 2011-12-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101765287A (en) * | 2009-12-03 | 2010-06-30 | 海洋王照明科技股份有限公司 | Fluorescent lamp control circuit and fluorescent lamp thereof |
| CN102497694A (en) * | 2011-11-14 | 2012-06-13 | 哈尔滨工业大学 | Digital LED drive circuit based on array open circuit number observation |
| CN101778524B (en) * | 2009-09-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Fluorescent lamp dimming control circuit and dimmable fluorescent lamp thereof |
| CN103269554A (en) * | 2013-05-28 | 2013-08-28 | 深圳威迈斯电源有限公司 | Universal gas lamp starting circuit and realizing method thereof |
| CN104242714A (en) * | 2014-07-10 | 2014-12-24 | 丁文萍 | High-frequency power supply equipment for wireless power transmission device of Class D structure |
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2008
- 2008-06-02 CN CN2008100646494A patent/CN101336031B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101778524B (en) * | 2009-09-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Fluorescent lamp dimming control circuit and dimmable fluorescent lamp thereof |
| CN101765287A (en) * | 2009-12-03 | 2010-06-30 | 海洋王照明科技股份有限公司 | Fluorescent lamp control circuit and fluorescent lamp thereof |
| CN102497694A (en) * | 2011-11-14 | 2012-06-13 | 哈尔滨工业大学 | Digital LED drive circuit based on array open circuit number observation |
| CN102497694B (en) * | 2011-11-14 | 2014-08-13 | 哈尔滨工业大学 | Digital LED drive circuit based on array open circuit number observation |
| CN103269554A (en) * | 2013-05-28 | 2013-08-28 | 深圳威迈斯电源有限公司 | Universal gas lamp starting circuit and realizing method thereof |
| CN103269554B (en) * | 2013-05-28 | 2015-04-22 | 深圳威迈斯电源有限公司 | Universal gas lamp starting circuit and realizing method thereof |
| CN104242714A (en) * | 2014-07-10 | 2014-12-24 | 丁文萍 | High-frequency power supply equipment for wireless power transmission device of Class D structure |
| CN104242714B (en) * | 2014-07-10 | 2018-01-02 | 丁文萍 | A kind of wireless power transmission device high frequency electric source equipment of Class D structures |
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| Publication number | Publication date |
|---|---|
| CN101336031B (en) | 2011-12-28 |
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Effective date of registration: 20201119 Address after: Group 17, Jianghai village, laobagang Binhai New Area (jiaoxie town), Haian City, Nantong City, Jiangsu Province, 226000 Patentee after: Nantong Binrui Intelligent Technology Co.,Ltd. Address before: Room 502, building 1, No. 40, xiayuangang East Street, Tianhe District, Guangzhou City, Guangdong Province 510000 Patentee before: Guangzhou Boyi Intellectual Property Operation Co.,Ltd. Effective date of registration: 20201119 Address after: Room 502, building 1, No. 40, xiayuangang East Street, Tianhe District, Guangzhou City, Guangdong Province 510000 Patentee after: Guangzhou Boyi Intellectual Property Operation Co.,Ltd. Address before: 150000 Heilongjiang Province, Harbin City Economic Development Zone haping Road District Dalian road and Xingkai road junction Patentee before: HIT ROBOT GROUP Co.,Ltd. |