CN101917812A - Metal halide lamp power supply and method for lighting metal halide lamp - Google Patents
Metal halide lamp power supply and method for lighting metal halide lamp Download PDFInfo
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- CN101917812A CN101917812A CN2010102526070A CN201010252607A CN101917812A CN 101917812 A CN101917812 A CN 101917812A CN 2010102526070 A CN2010102526070 A CN 2010102526070A CN 201010252607 A CN201010252607 A CN 201010252607A CN 101917812 A CN101917812 A CN 101917812A
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Abstract
The invention discloses a metal halide lamp power supply and a method for lighting a metal halide lamp. The power supply comprises a microprocessor, wherein a signal output end of the microprocessor is connected with input ends of a high-frequency high-voltage switching direct current power supply and a super-high voltage pulse power supply through a power grid input control circuit respectively; the output ends of the high-frequency high-voltage switching direct current power supply and the super-high voltage pulse power supply are connected with the metal halide lamp; a lighting current detection circuit feeds back a detected current detection signal to the microprocessor; and a voltage detection circuit feeds back a detected voltage signal to the microprocessor. The method for lighting the metal halide lamp comprises the following steps of: preparing the high-frequency high-voltage switching direct current power supply; when the output voltage of the high-frequency high-voltage switching direct current power supply is increased to a rated value, lighting the metal halide lamp by the super-high voltage pulse power supply, wherein the high-frequency high-voltage switching direct current power supply is used as a working power supply; and cutting off the input voltage of the super-high voltage pulse power supply. By the method for lighting the metal halide lamp of the invention, the metal halide lamp can be quickly and safely lighted; and the power supply of the invention is suitable for photo-curing equipment and has the advantages of high efficiency, energy conservation, low cost and the like.
Description
Technical field
The present invention relates to a kind of metal halide lamp power supply and method for lighting metal halide lamp, specifically, the method that relates to a kind of metal halide lamp power supply and light this metal halid lamp based on this metal halide lamp power supply.
Background technology
The metal halid lamp that present uv equipment uses is the cold light source electricity-saving lamp of a new generation, its ultraviolet radiation efficient can reach more than 93%, by high-purity quartz tubing charge into the iodide that contain mercury, argon, gallium, iodide and some rare metal halide manufacturings of iron forms.This metal halid lamp is widely used in industries such as wiring board (PCB) manufacturing, UV machine, printing, etching, medical treatment, for example is used for the curing, PCB dry film, wet film, green welding resistance, pcb board exposure of UV printing ink, UV paint etc.
This uv equipment required supply voltage height (500V-5000V) of metal halid lamp, electric current big (2-200A), can only adopt the following course of work to light this metal halid lamp: to trigger by high-voltage trigger earlier before the work and light a lamp, being about to main power source after lamp is lighted connects, this moment, the electric current of lamp rose very fast, 2-3 promptly reaches rated value second, but it is very slow that the voltage of lamp tube ends rises, and raise gradually along with the temperature in the lamp and rise, and generally wanted 2-4 minute just can reach rated value.As seen, the regular tap power supply can't satisfy this nonlinear course of work, and the pulse power is also not all right.
In using at present, be to adopt Industrial Frequency Transformer both at home and abroad mostly as metal halide lamp power supply, 50HZ Industrial Frequency Transformer for example.The course of work that Industrial Frequency Transformer is lit a lamp is: triggered by trigger earlier and light a lamp, by A.C. contactor transformer frequency response is closed then, then trigger disconnects; After transformer is connected with the mains, because metal halid lamp is under the cold conditions, near short circuit, its voltage output drops to about 20V, so the primary and secondary electric current of transformer of this moment is very big and uncontrollable, after waiting until that the interior temperature of metal halid lamp rises gradually, transformer-secondary voltage could slowly rise to rated value, and its secondary current also could slowly be reduced to rated value.Though the Industrial Frequency Transformer power supply can realize lighting the effect of this metal halid lamp,, this Industrial Frequency Transformer power supply very unstable in the course of the work (with the variation of electrical network changes) and non-adjustable (how many transformer parameters designing is is exactly what).And because the Industrial Frequency Transformer power supply is single-phase 380V input, therefore, the people is for having caused three-phase imbalance; And the efficient of transformer frequency response itself is also very low, has only about 50%, causes grid power factor≤0.5, has greatly wasted the energy, has reduced service efficiency.In addition, the volume of transformer is big and heavy, and there are inconvenience in installation and transportation and maintenance.
Summary of the invention
The object of the present invention is to provide a kind of metal halide lamp power supply and method for lighting metal halide lamp, can light metal halid lamp fast by this ignition method based on this metal halide lamp power supply, make metal halid lamp enter steady-working state fast, these metal halide lamp power supply energy-saving and environmental protection, long service life, volume are little, in light weight.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of metal halide lamp power supply, it is characterized in that: it comprises microprocessor, high-frequency and high-voltage switching mode DC power supply, the super-high pressure pulse power supply, the lighting current testing circuit, voltage detecting circuit, wherein: the signal output part of this microprocessor via the electrical network input control circuit respectively with this high-frequency and high-voltage switching mode DC power supply, the input of this super-high pressure pulse power supply connects, this high-frequency and high-voltage switching mode DC power supply, the output of this super-high pressure pulse power supply all is connected with metal halid lamp, the current detection signal that this lighting current testing circuit will detect in the loop of this metal halid lamp and the formation of this super-high pressure pulse power supply feeds back to this microprocessor, and this voltage detecting circuit feeds back to this microprocessor with the voltage signal of detected this high-frequency and high-voltage switching mode DC power supply output.
A kind of method for lighting metal halide lamp is characterized in that, it comprises step: supply voltage is set in the input input first to this high-frequency and high-voltage switching mode DC power supply, and the voltage of this high-frequency and high-voltage switching mode DC power supply output raises gradually; When the voltage of this high-frequency and high-voltage switching mode DC power supply output rises to rated value, supply voltage is set in input input second to this super-high pressure pulse power supply, this super-high pressure pulse power supply is lighted this metal halid lamp, when lighting this metal halid lamp, this high-frequency and high-voltage switching mode DC power supply is as the working power of this metal halid lamp, and this metal halid lamp enters operating state; Cut off second of this super-high pressure pulse power supply of input and set supply voltage.
Advantage of the present invention is:
Metal halide lamp power supply of the present invention is high frequency, high pressure, large power supply, and the power supply gross efficiency reaches more than 92%, compares with the Industrial Frequency Transformer power supply, and efficient has improved more than the 30-40%, and power savings is very remarkable.Metal halide lamp power supply of the present invention is specially adapted to such as uv equipments such as exposure machine, UV machine, printing machine, etching machine, medical apparatus equipment.
In actual applications, if new uv equipment adopts power supply of the present invention, original circuit structure of simplified apparatus greatly then, reduction equipment uses energy consumption, improves the service efficiency of equipment, easy operation sequence; If old uv equipment is transformed, then only need the old power supply of original equipment is replaced by power supply of the present invention, just can reach purpose energy-conservation, that reduce discharging, lower consumption, reduced the more cost of exchange device of enterprise, improved the performance of enterprises.
In metal halide lamp power supply of the present invention, this high-frequency and high-voltage switching mode DC power supply is predeterminable or directly regulate the relevant parameter of metal halid lamp, thereby the emittance of control metal halid lamp prolongs useful life of metal halid lamp.Metal halide lamp power supply of the present invention has that efficient height, loss are little, energy-conservation, optical radiation energy stable and uniform, long service life, cost is low, volume is little, in light weight, the convenient installation and the advantage of transportation.
Method for lighting metal halide lamp of the present invention can be fast, the point of safes bright gold belongs to Halogen lamp LED, and the metal halid lamp of lighting by this method for lighting metal halide lamp can be normally, steady operation.
Description of drawings
Fig. 1 is the composition schematic diagram of metal halide lamp power supply of the present invention;
Fig. 2 is the circuit theory schematic diagram of super-high pressure pulse power supply;
Fig. 3 is the composition frame chart of high-frequency and high-voltage switching mode DC power supply;
Fig. 4 is the circuit theory schematic diagram of LC filter circuit, zero-current soft switch high frequency power change-over circuit, high frequency full-wave rectifying circuit, LCL high-frequency filter circuit;
Fig. 5 is the circuit theory schematic diagram (shunt in the current stabilization circuit is shown in Figure 4) of pwm control circuit, voltage stabilizing circuit, current stabilization circuit;
Fig. 6 is the partial circuit in the electrical network input control circuit and the connection diagram of microprocessor;
Fig. 7 is existing CLC filter circuit;
Fig. 8 is existing LCLC filter circuit.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
As Fig. 1, metal halide lamp power supply of the present invention comprises microprocessor 100 (as Fig. 6), high-frequency and high-voltage switching mode DC power supply 300, super-high pressure pulse power supply 400, lighting current testing circuit 600, voltage detecting circuit 800.The signal output part of this microprocessor 100 via electrical network input control circuit 200 respectively with the input of this high-frequency and high-voltage switching mode DC power supply 300, the input of this super-high pressure pulse power supply 400 connects, the output of this high-frequency and high-voltage switching mode DC power supply 300, the output of this super-high pressure pulse power supply 400 all is connected with metal halid lamp 500, just this high-frequency and high-voltage switching mode DC power supply 300 is the state of being connected in parallel with this super-high pressure pulse power supply 400, the current detection signal that this lighting current testing circuit 600 will detect in the loop that this metal halid lamp 500 and this super-high pressure pulse power supply 400 form feeds back to this microprocessor 100, and this voltage detecting circuit 800 feeds back to this microprocessor 100 with the voltage signal of detected these high-frequency and high-voltage switching mode DC power supply 300 outputs.Whether current detection signal reflection metal halid lamp 500 is lighted.For example, if metal halid lamp 500 is lighted, then have electric current to pass through in the loop that this metal halid lamp 500 and this super-high pressure pulse power supply 400 form, setting current detection signal is 1, otherwise current detection signal is 0.This microprocessor 100 also can be connected with display circuit 700.This lighting current testing circuit 600, voltage detecting circuit 800, this electrical network input control circuit 200 belong to prior art, here do not describe in detail.Fig. 6 only shows the part of this electrical network input control circuit.Display circuit 700 is referring to shown in Figure 6.
As Fig. 2, this super-high pressure pulse power supply 400 comprises the second transformer B2, the 3rd transformer B3, high-frequency discharge device 401.The primary side of this second transformer B2 is connected with the output of electrical network input control circuit 200, and the primary side of this second transformer B2 adopts 50HZ, 220V to exchange input, is controlled via electrical network input control circuit 200 by microprocessor 100.The primary side output voltage of this second transformer B2 is 2000V, electric current 50mA.The primary side of this second transformer B2 and a high-voltage energy storage capacitor device C4 are connected in parallel, be connected in parallel with this energy storage capacitor C4 after the primary side of the 3rd transformer B3 is connected with this high-frequency discharge device 401, a primary side high-frequency and high-voltage silicon stack D3 of series connection (15KV/1A) back of the 3rd transformer B3 is connected with metal halid lamp 500.This super-high pressure pulse power supply 400 is formed simple, and Installation and Debugging are convenient.
In Fig. 2, high-frequency discharge device 401 comprises epoxy rods, offers the aerobic through hole on this epoxy rods, is installed with two screws on this epoxy rods, and the end of these two screws is positioned at this aerobic through hole and is oppositely arranged, and these two screws are connected with corresponding lead respectively.The discharge rate of this high-frequency discharge device 401 can change by the distance of adjusting between these two screw end, thereby adjusts the voltage swing of these super-high pressure pulse power supply 400 outputs and the power of output.
For example, in actual fabrication, this high-frequency discharge device 401 adopts epoxy rods to make, and the middle part of this epoxy rods offers the aerobic through hole, and the two ends of this epoxy rods respectively are provided with an embedded nut, these two nuts are relative, the outer end of these two nuts is connected and fixed with the thick copper sheet tapping of 2mm, fix nut after, in each nut, be screwed into a screw, screw makes its corresponding nut, copper sheet, epoxy rods string together, and the distance between these two screw end is arcing distance.
As Fig. 3 and Fig. 4, this high-frequency and high-voltage switching mode DC power supply 300 comprises rectified three-phase circuit 302, LC filter circuit 303, zero-current soft switch high frequency power change-over circuit 304, high frequency full-wave rectifying circuit 305, LCL high-frequency filter circuit 306.As figure, the output of this electrical network input control circuit 200 is connected with the power end of this zero-current soft switch high frequency power change-over circuit 304 via this rectified three-phase circuit 302, this LC filter circuit 303 successively, the output of this zero-current soft switch high frequency power change-over circuit 304 is connected with metal halid lamp 500 via this high frequency full-wave rectifying circuit 305, this LCL high-frequency filter circuit 306 successively, and pwm control circuit 308 is connected via the control end of active driving circuit 307 with this zero-current soft switch high frequency power change-over circuit 304.
As Fig. 3, the anti-jamming circuit 301 of can connecting between this electrical network input control circuit 200 and this rectified three-phase circuit 302.In order to reduce and reduce the interference that 300 pairs of electrical networks of high-frequency and high-voltage switching mode DC power supply cause, this high-frequency and high-voltage switching mode DC power supply 300 adopts slow Starting mode, a slow start circuit 312 promptly is set, this slow start circuit 312 is connected with this pwm control circuit 308, thereby reduces rush of current and the interference of power initiation to electrical network.
Because the operating voltage height of metal halid lamp 500, power is big, and its course of work is non-linear, therefore, this high-frequency and high-voltage switching mode DC power supply 300 should have voltage stabilizing, the current stabilization function, as Fig. 3, these high-frequency and high-voltage switching mode DC power supply 300 designs have current stabilization circuit 309 and voltage stabilizing circuit 310, this current stabilization circuit 309, the electric current that this voltage stabilizing circuit 310 is exported this LCL high-frequency filter circuit 306 respectively, voltage signal feeds back to pwm control circuit 308, thereby makes pwm control circuit 308 according to the voltage that feeds back, current signal is controlled the output of zero-current soft switch high frequency power change-over circuit 304.This high-frequency and high-voltage switching mode DC power supply 300 also can be provided with failure detector circuit 311, when zero-current soft switch high frequency power change-over circuit 304 or active driving circuit 307 have faults such as overheated, overcurrent, this failure detector circuit 311 feeds back to this pwm control circuit 308 with fault-signal, thereby makes 308 pairs of zero-current soft switch high frequency powers of pwm control circuit change-over circuit 304 take corresponding control measures.
As Fig. 4 to Fig. 6, this anti-jamming circuit 301 is made of three piezo-resistance RT1～RT3, three inductance L 1～L3, receives three-phase 50HZ, the input of 380V alternating voltage.Rectified three-phase circuit 302 comprises three-phase commutation bridge ZL1.This LC filter circuit 303 is made of an inductance L 4 and a capacitor C 1.This capacitor C 1 is a polypropylene capactive, does not adopt common electrochemical capacitor, has guaranteed the useful life of high-frequency and high-voltage switching mode DC power supply 300.Inductance L 4 adopts O sections core, has effectively suppressed rush of current, also can play radiation resistance simultaneously.
As Fig. 3 and Fig. 4, this zero-current soft switch high frequency power change-over circuit 304 comprises the bridge-type IGBT module and the first transformer B1, an output of this bridge-type IGBT module is connected with an end (1 end) of this first transformer B1 primary side by capacitance C2, and another output of this bridge-type IGBT module is connected with the other end (2 end) of this first transformer B1 primary side.
Four IGBT Q1～Q4 in the bridge-type IGBT module are subjected to pwm control circuit 308 controls.In actual applications, through repetition test, the operating frequency of this zero-current soft switch high frequency power change-over circuit 304 is defined as 18.5KHZ, the tube voltage drop minimum of IGBT Q1～Q4 like this, about 1.7V, bridge-type IGBT module two ends need not any RC absorption circuit and trigger impulse shaping circuit, and the switch efficiency of IGBT is high, and the general power supply of temperature rise ratio of bridge-type IGBT module is low.Active driving circuit 307 adopts M57962L or M57959L driver module, and adopts the positive-negative power supply pattern, can accelerate the speed of bridge-type IGBT module when turn-offing, and guarantees IGBT loss minimum when turn-offing.
This first transformer B1 is a high frequency high voltage transformer, and its magnetic core adopts EE type ferrite magnetic core to make (nanocrystalline magnet core is magnet ring, and is seamless, this high-frequency and high-voltage switching mode DC power supply 300 relatively, the magnetic saturation pressure drop is on the low side, and is inapplicable).This first transformer B1 employing rectangle skeleton and multiply enamelled wire, the primary and secondary side of external application teflon sleeve cover system coiling.Adopt the coiling of rectangle skeleton, ventilation hole is left in the centre, has solved the root problem of iron core heat radiation, and can not influence the transformer conversion efficiency.Adopt the polytetrafluoroethylene film insulation between the layer of this first transformer B1 and the layer.Through the reality test, this first transformer B1 less than 80 degree, meets the requirement that works long hours through air cooling rear surface temperature.And the fixed support that this first transformer B1 installs is different from common high frequency transformer support, and what it adopted is flat for sleeping in, fastening means installation, has both solved the heat dissipation problem of transformer, has solved withstand voltage, the electromagnetic compatibility problem of transformer again.
In the present invention, bridge-type IGBT module and mode of operation thereof, active driving circuit 307, failure detector circuit 311 belong to prior art, here do not describe in detail.
As Fig. 4, this high frequency full-wave rectifying circuit 305 comprises two diodes 3051,3052, and these two diodes 3051,3052 are connected with two outputs (3 ends and 5 ends) of this first transformer B1 primary side respectively.Because voltage height, the electric current of this first transformer B1 output are big, use the diode 3051,3052 that constitutes by the high-frequency and high-voltage fast recovery diode among the present invention, diode 3051,3052 includes at least three fast recovery diodes, connects between this fast recovery diode.
At present, for output filtering part, what generally adopt is CLC filter circuit shown in Figure 7 or LCLC filter circuit shown in Figure 8, and these two kinds of filter circuits are feasible for the power supply of low-voltage, big electric current.But, this high-frequency and high-voltage switching mode DC power supply 300 is high voltage, high-power out-put supply, the distributed capacitance of transformer is bigger, if adopt CLC or LCLC filter circuit, the efficient of power supply can be very low, can have influence on the turn-off speed of bridge-type IGBT module, the heat dissipation problem of the bridge-type IGBT module heat radiator and first transformer can't be resolved, and the general type of cooling all can not guarantee the power supply operate as normal.Therefore, this high-frequency and high-voltage switching mode DC power supply 300 adopts the LCL filtering mode, and this LCL high-frequency filter circuit 306 is made of inductance L 5, inductance L 6 and capacitor C 3.As shown in Figure 4, the input of two diodes 3051,3052 is connected with two outputs (3 ends, 5 ends) of this first transformer B1 primary side respectively, and the output of these two diodes 3051,3052 all is connected with an end of inductance L 5; One end of inductance L 6 is connected with the center-side (4 end) of this first transformer B1 primary side.The other end of inductance L 5, L6 is connected with the two ends of metal halid lamp 500 respectively.This inductance L 5, L6 adopt UU type ferrite magnetic, form with the coiling of multiply enamelled wire.The high-frequency filter capacitor C3 that is connected in parallel at the two ends of metal halid lamp 500, this capacitor C 3 adopts the axial filter capacitors of the noninductive two thorns of high-frequency and high-voltages, to guarantee power-efficient and stable.Through actual measurement, the efficient of this high-frequency and high-voltage switching mode DC power supply 300 can reach more than 93.8%, and use is fit to work long hours.
In the present invention; this LCL high-frequency filter circuit 306 has not only played the effect of smothing filtering; make the light source of metal halid lamp 500 soft stable; and owing to devote oneself to work in a flash in high-frequency and high-voltage switching mode DC power supply 300, rush of current is very big; at this moment; this LCL high-frequency filter circuit 306 also can make current peak be able to effective inhibition, has effectively protected high-frequency and high-voltage switching mode DC power supply 300, makes power supply 300 stand the impact of big electric current.Can see that in actual use because the energising transient voltage of super-high pressure pulse power supply 400 is more than 15KV, therefore, for super-high pressure pulse power supply 400 and high-frequency and high-voltage switching mode DC power supply 300, their requirement of withstand voltage all must be more than 20KV.In the moment that super-high pressure pulse power supply 400 powers up, because the design of LCL high-frequency filter circuit 306, high pressure and the counteracting of its inverse electromotive force that on inductance L 5, L6, produces that can super-high pressure pulse power supply 400 produces when lighting a lamp, be equivalent to high-frequency and high-voltage switching mode DC power supply 300 and super-high pressure pulse power supply 400 are isolated, thereby guarantee that super-high pressure pulse power supply 400 and high-frequency and high-voltage switching mode DC power supply 300 can safe parallel operations.If do not design LCL high-frequency filter circuit 306 like this, then 300 very easy high pressure that powered up the moment generation by super-high pressure pulse power supply 400 of high-frequency and high-voltage switching mode DC power supply reflex in the first transformer B1 circuit before by the first transformer B1, bridge-type IGBT module is broken, cause power supply to damage.And if do not design LCL high-frequency filter circuit 306 like this, metal halid lamp 500 also is difficult for lighting or be easy to extinguish, and light can glimmer and not stop, and causes the optical radiation energy instability, cisco unity malfunction etc.
As Fig. 4, the input of voltage detecting circuit 800 connects the common point of inductance L 5 and capacitor C 3, the output of voltage detecting circuit 800 is connected with corresponding signal input part on the microprocessor 100, and voltage detecting circuit 800 is used for the voltage signal that high-frequency and high-voltage switching mode DC power supply 300 finally transfers to metal halid lamp 500 is fed back to microprocessor 100.
As shown in Figure 5, this pwm control circuit 308 comprises the PWM modulator, this PWM modulator adopts the SG3525 chip, in Fig. 5, output 1A, the 2A of this pwm control circuit 308,1B, 2B (3A, 4A, 3B, 4B are that extended power is standby) are connected with the control end of IGBTQ1～Q4 via active driving circuit 307 respectively.This slow start circuit 312 is connected with the Soft end (pin 8) of SG3525 chip as shown in Figure 5.The pwm control circuit of being made up of SG3525 chip etc. is a custom circuit, here no longer describes in detail.
As shown in Figure 4 and Figure 5, current stabilization circuit 309 comprises shunt 3091, this shunt 3091 is connected with inductance L 6, inductance L 6 is connected with current feedback circuit shown in Figure 5 (comprising amplifier TL084 UIA and TL084 UID) with the common point of shunt 3091, and the output of this current feedback circuit is connected with the in-phase input end IN+ of PWM modulator Ic2.Voltage stabilizing circuit 310 comprises resistance unit 3101, the common point of inductance L 5 and capacitor C 3 is connected with voltage feedback circuit (comprising amplifier TL084 UIB and TL084 UIC) shown in Figure 5 via this resistance unit 3101, and the output of this voltage feedback circuit is connected with the in-phase input end IN+ of PWM modulator Ic2.In actual applications, can pass through K switch
CV, K
CCCome between current stabilization and voltage stabilizing, to select a kind of power work state.
In addition, in actual applications, can metal halide lamp power supply of the present invention be designed to total power, half-power, 1/4 power operating state according to customer requirements.
The present invention also provides a kind of method for lighting metal halide lamp based on above-mentioned metal halide lamp power supply, it comprises step: supply voltage is set in the input input first to this high-frequency and high-voltage switching mode DC power supply 300, and the voltage of these high-frequency and high-voltage switching mode DC power supply 300 outputs raises gradually; When the voltage of these high-frequency and high-voltage switching mode DC power supply 300 outputs rises to rated value, supply voltage is set in input input second to this super-high pressure pulse power supply 400, this super-high pressure pulse power supply 400 is lighted this metal halid lamp 500, when lighting this metal halid lamp 500, these high-frequency and high-voltage switching mode DC power supply 300 working powers as this metal halid lamp 500, this metal halid lamp 500 enters operating state; Cut off second of this super-high pressure pulse power supply 400 of input and set supply voltage.In practice, this first setting supply voltage is three-phase alternating current 50HZ, 380V voltage, and this second setting supply voltage is for exchanging 50HZ, 220V voltage.In practical operation, after this super-high pressure pulse power supply 400 is lighted this metal halid lamp 500, just cut off second of this super-high pressure pulse power supply 400 of input immediately and set supply voltage.
More particularly, as Fig. 1 to Fig. 6, this process of lighting a lamp is: at first, microprocessor 100 sends the transmission of electricity instruction to electrical network input control circuit 200, electrical network input control circuit 200 is to the input input three-phase alternating current 50HZ of this high-frequency and high-voltage switching mode DC power supply 300,380V city voltage, this city's voltage via anti-jamming circuit 301 to three-phase commutation bridge ZL1 rectification, enter LC filter circuit 303 then and become direct voltage (about 530V), this direct voltage is applied on the power end of zero-current soft switch high frequency power change-over circuit 304, the bridge-type IGBT module of zero-current soft switch high frequency power change-over circuit 304 is subjected to the control of pwm control circuit 308 and carries out HF switch and change, the alternating voltage of output is sent into high frequency full-wave rectifying circuit 305 after via the first transformer B1 carry out full-wave rectification, this high frequency full-wave rectifying circuit 305 is sent the high frequency dc high voltage that produces into this LCL high-frequency filter circuit 306, powers to metal halid lamp 500 outputs after these LCL high-frequency filter circuit 306 filtering.Voltage detecting circuit 800 is with the voltage of this high-frequency and high-voltage switching mode DC power supply 300 of machine testing to metal halid lamp 500 outputs.This high-frequency and high-voltage switching mode DC power supply 300 is subjected to the control of slow start circuit 312, and the voltage of its output raises gradually.The voltage that begins most power supply 300 outputs does not reach the rated value of keeping metal halid lamp 500 work.When the voltage that the voltage signal that detects according to voltage detecting circuit 800 when microprocessor 100 is judged 300 outputs of high-frequency and high-voltage switching mode DC power supply is elevated to rated value, microprocessor 100 sends the transmission of electricity instruction to electrical network input control circuit 200, electrical network input control circuit 200 is to the input input single phase alternating current (A.C.) 50HZ of this super-high pressure pulse power supply 400,220V voltage, this voltage boosts via the second transformer B2 and is high pressure (2000V), give energy storage capacitor C4 charging simultaneously, subsequently via 401 discharges of high-frequency discharge device, by the primary side of the 3rd transformer B3 by high-frequency and high-voltage silicon stack D3 output more than or equal to the high-voltage pulse of 15KV to metal halid lamp 500, this metal halid lamp 500 of instant igniting.In instant igniting metal halid lamp 500, lighting current testing circuit 600 feeds back to this microprocessor 100 with the current detection signal in the loop that this moment, detected metal halid lamp 500 and this super-high pressure pulse power supply 400 formed.If showing in the loop that this metal halid lamp 500 and this super-high pressure pulse power supply 400 form, the current detection signal that feeds back to this microprocessor 100 have electric current to pass through (being that metal halid lamp 500 is lighted), then when metal halid lamp 500 is lighted, make ready prepd these high-frequency and high-voltage switching mode DC power supply 300 working powers, keep this metal halid lamp 500 operate as normal as this metal halid lamp 500.After lighting this metal halid lamp 500, microprocessor 100 sends immediately and cuts off the instruction of super-high pressure pulse power supply 400 input voltages, be that electrical network input control circuit 200 is no longer to these super-high pressure pulse power supply 400 power supplies, the input voltage of this super-high pressure pulse power supply 400 is cut off, and the process of lighting a lamp is finished smoothly.Show that metal halid lamp 500 is not lighted if feed back to the current detection signal of this microprocessor 100, then this super-high pressure pulse power supply 400 is lit a lamp again.
In the process of this high-frequency and high-voltage switching mode DC power supply 300 as metal halid lamp 500 working powers, the user can select current stabilization or voltage stabilizing working method.If select the current stabilization working method, then this current stabilization circuit 309 feeds back to pwm control circuit 308 with the current signal of these LCL high-frequency filter circuit 306 outputs, thereby makes pwm control circuit 308 control the electric current output of zero-current soft switch high frequency power change-over circuit 304 better according to the current signal that feeds back.If select the voltage stabilizing working method, then this voltage stabilizing circuit 310 feeds back to pwm control circuit 308 with the voltage signal of these LCL high-frequency filter circuit 306 outputs, thereby makes pwm control circuit 308 control the voltage output of zero-current soft switch high frequency power change-over circuit 304 according to the voltage signal that feeds back.
After powering up (three-phase alternating current 50HZ, 380V voltage) for this high-frequency and high-voltage switching mode DC power supply 300, if power supply of the present invention is in the current stabilization state, then high-frequency and high-voltage switching mode DC power supply 300 promptly is in voltage the highest (setting voltage rated value), electric current is zero unloaded current stabilization state; (super-high pressure pulse power supply 400 instant igniting metal halid lamps 500 when high-frequency and high-voltage switching mode DC power supply 300 is in parallel with 400 moments of super-high pressure pulse power supply, when having electric current to pass through in the loop that itself and metal halid lamp 500 form), electric current in the metal halid lamp 500 increases to rated value (setting current rating) rapidly, at this moment, the terminal voltage of metal halid lamp 500 is reduced to minimum (about 20V); Then, along with temperature in the metal halid lamp raises gradually, the terminal voltage of these LCL high-frequency filter circuit 306 outputs rises to former setting voltage rated value gradually, and the terminal voltage of metal halid lamp 500 also raises gradually, generally reaches rated value in 1 minute.
Yet; when reality is implemented; because the voltage height of high-frequency and high-voltage switching mode DC power supply 300 outputs; and the moment that high-frequency and high-voltage switching mode DC power supply 300 and super-high pressure pulse power supply 400 are in parallel; control signal is easy to be disturbed; make power supply 300 start misoperation protection (the corresponding protect measure that is provided with; belong to prior art; here do not describe in detail); therefore; power up moment at super-high pressure pulse power supply 400; the control of SG3525 can be protected signal input part (10 pin) short circuit ground connection (realizing) by microprocessor; during moment powers up; high-frequency and high-voltage switching mode DC power supply 300 is in Light Condition; usually can not break down (repetition test and actual the use draw this conclusion); therefore; after treating 400 outages of super-high pressure pulse power supply; again signal input part being protected in the control of SG3525 disconnects with ground; recover original defencive function; to guarantee that high-frequency and high-voltage switching mode DC power supply 300 is after the process of lighting a lamp is finished smoothly; metal halid lamp 500 energy operate as normal, and high-frequency and high-voltage switching mode DC power supply 300 also is in safe slave mode with super-high pressure pulse power supply 400.
It should be noted that, in reality is implemented, can adopt manual mode or use discrete device to realize the function of above-mentioned microprocessor and electrical network input control circuit, but, the effect that manual mode or discrete device reach is far from the effective of microprocessor and the generation of electrical network input control circuit, can't finish the action of ns, and the failure rate of power work is increased greatly, cause the unsteadiness of power work, the volume of power supply also can increase greatly.
Compare with Industrial Frequency Transformer, metal halide lamp power supply of the present invention has following characteristics, sees the following form:
For example: the double sided board exposure machine of a 7KW of PCB industry, the metal halid lamp of two 7KW of use.If with the power supply of 50HZ Industrial Frequency Transformer, it is input as single-phase 380V, the interchange input current is 36A, and the line current of middle phase is 72A.Metal halide lamp power supply of the present invention be input as three-phase alternating current 380V, exchange total input current smaller or equal to 27A.If adopt the 50HZ Industrial Frequency Transformer, this exposure machine (every with two transformers) per hour electricity consumption is 31.5KWH, calculated in 20 hours by working every day, usage ratio of equipment is 85%, every day, the actual power consumption that makes was 535 degree, 15% half-power state, power consumption are 47 degree, and promptly the power consumption of every day is 582 degree.If adopt metal halide lamp power supply of the present invention, every day, actual power consumption was 301 degree, 15% half-power state, power consumption is 26 degree, the power consumption that is every day is 327 degree, and every day, amount of electricity saving reached about 255 degree, and (calculating by 26 days) economize on electricity in average every month reaches 6600 degree, then economize on electricity reached 72600 degree by calculating in 11 months in 1 year so.Can see that for a middle-size and small-size circuit board plant, if calculate by 6 exposure machines, 1 year 43.56 ten thousand degree that can economize on electricity at least if calculate by 1 yuan/degree, can be saved 43.56 ten thousand yuan of the electricity charge every year, and is very considerable.
Advantage of the present invention is:
Metal halide lamp power supply of the present invention is high frequency, high pressure, large power supply, and the power supply gross efficiency reaches more than 92%, compares with the Industrial Frequency Transformer power supply, and efficient has improved more than the 30-40%, and power savings is very remarkable.Metal halide lamp power supply of the present invention is specially adapted to such as uv equipments such as exposure machine, UV machine, printing machine, etching machine, medical apparatus equipment.
In actual applications, if new uv equipment adopts power supply of the present invention, original circuit structure of simplified apparatus greatly then, reduction equipment uses energy consumption, improves the service efficiency of equipment, easy operation sequence; If old uv equipment is transformed, then only need the old power supply of original equipment is replaced by power supply of the present invention, just can reach purpose energy-conservation, that reduce discharging, lower consumption, reduced the more cost of exchange device of enterprise, improved the performance of enterprises.
In metal halide lamp power supply of the present invention, this high-frequency and high-voltage switching mode DC power supply is predeterminable or directly regulate the relevant parameter of metal halid lamp, thereby the emittance of control metal halid lamp prolongs useful life of metal halid lamp.Metal halide lamp power supply of the present invention has that efficient height, loss are little, energy-conservation, optical radiation energy stable and uniform, long service life, cost is low, volume is little, in light weight, the convenient installation and the advantage of transportation.
Method for lighting metal halide lamp of the present invention can be fast, the point of safes bright gold belongs to Halogen lamp LED, and the metal halid lamp of lighting by this method for lighting metal halide lamp can be normally, steady operation.
The above is preferred embodiment of the present invention and the know-why used thereof; for a person skilled in the art; under the situation that does not deviate from the spirit and scope of the present invention; any based on conspicuous changes such as the equivalent transformation on the technical solution of the present invention basis, simple replacements, all belong within the protection range of the present invention.
Claims (9)
1. metal halide lamp power supply, it is characterized in that: it comprises microprocessor, high-frequency and high-voltage switching mode DC power supply, super-high pressure pulse power supply, lighting current testing circuit, voltage detecting circuit, wherein:
The signal output part of this microprocessor via the electrical network input control circuit respectively with this high-frequency and high-voltage switching mode DC power supply, the input of this super-high pressure pulse power supply connects, this high-frequency and high-voltage switching mode DC power supply, the output of this super-high pressure pulse power supply all is connected with metal halid lamp, the current detection signal that this lighting current testing circuit will detect in the loop of this metal halid lamp and the formation of this super-high pressure pulse power supply feeds back to this microprocessor, and this voltage detecting circuit feeds back to this microprocessor with the voltage signal of detected this high-frequency and high-voltage switching mode DC power supply output.
2. metal halide lamp power supply as claimed in claim 1 is characterized in that:
Described super-high pressure pulse power supply comprises second transformer, the 3rd transformer, high-frequency discharge device, wherein:
The primary side of this second transformer is connected with the output of described electrical network input control circuit, the primary side of this second transformer and an energy storage capacitor are connected in parallel, be connected in parallel with this energy storage capacitor after the primary side of the 3rd transformer is connected with this high-frequency discharge device, be connected with described metal halid lamp behind high-frequency and high-voltage silicon stack of primary side series connection of the 3rd transformer.
3. metal halide lamp power supply as claimed in claim 2 is characterized in that:
Described high-frequency discharge device comprises epoxy rods, offers the aerobic through hole on this epoxy rods, is installed with two screws on this epoxy rods, and the end of these two screws is positioned at this aerobic through hole and is oppositely arranged, and these two screws are connected with corresponding lead respectively.
4. metal halide lamp power supply as claimed in claim 1 is characterized in that:
Described high-frequency and high-voltage switching mode DC power supply comprises rectified three-phase circuit, LC filter circuit, zero-current soft switch high frequency power change-over circuit, high frequency full-wave rectifying circuit, LCL high-frequency filter circuit, wherein:
The output of described electrical network input control circuit is connected with the power end of this zero-current soft switch high frequency power change-over circuit via this rectified three-phase circuit, this LC filter circuit successively, the output of this zero-current soft switch high frequency power change-over circuit is connected with described metal halid lamp via this high frequency full-wave rectifying circuit, LCL high-frequency filter circuit successively, and the control end of this zero-current soft switch high frequency power change-over circuit is connected with pwm control circuit.
5. metal halide lamp power supply as claimed in claim 4 is characterized in that:
Described rectified three-phase circuit comprises three-phase commutation bridge;
Described LC filter circuit is made of an inductance and an electric capacity;
Described zero-current soft switch high frequency power change-over circuit comprises the bridge-type IGBT module and first transformer, and two outputs of this bridge-type IGBT module are connected with the two ends of this first transformer primary respectively;
Described high frequency full-wave rectifying circuit comprises two diodes, and these two diodes are connected with two outputs of this first transformer secondary respectively;
Described LCL high-frequency filter circuit is made of two inductance and an electric capacity, one end of these two inductance is connected with the output of these two diodes, the center-side of this first transformer secondary respectively, the other end of these two inductance is connected with described metal halid lamp two ends respectively, and this electric capacity is in parallel with described metal halid lamp.
6. metal halide lamp power supply as claimed in claim 5 is characterized in that:
Electric capacity in the described LC filter circuit is polypropylene capactive;
The magnetic core of described first transformer is an EE type ferrite magnetic core;
Described diode comprises the fast recovery diode of at least three series connection.
7. as claim 4 or 5 or 6 described metal halide lamp power supplies, it is characterized in that:
Described high-frequency and high-voltage switching mode DC power supply comprises slow start circuit, current stabilization circuit and voltage stabilizing circuit, this slow start circuit is connected with described pwm control circuit, and this current stabilization circuit, this voltage stabilizing circuit feed back to described pwm control circuit with electric current, the voltage signal of described LCL high-frequency filter circuit output respectively.
8. method for lighting metal halide lamp is characterized in that it comprises step:
Supply voltage is set in input input first to this high-frequency and high-voltage switching mode DC power supply, and the voltage of this high-frequency and high-voltage switching mode DC power supply output raises gradually; When the voltage of this high-frequency and high-voltage switching mode DC power supply output rises to rated value, supply voltage is set in input input second to this super-high pressure pulse power supply, this super-high pressure pulse power supply is lighted this metal halid lamp, when lighting this metal halid lamp, this high-frequency and high-voltage switching mode DC power supply is as the working power of this metal halid lamp, and this metal halid lamp enters operating state; Cut off second of this super-high pressure pulse power supply of input and set supply voltage.
9. method for lighting metal halide lamp as claimed in claim 8 is characterized in that:
The described first setting supply voltage is three-phase alternating current 50HZ, 380V voltage, and described second sets supply voltage for exchanging 50HZ, 220V voltage.
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