CN102984875B - Xenon lamp power source for instrument - Google Patents
Xenon lamp power source for instrument Download PDFInfo
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- CN102984875B CN102984875B CN201210507350.8A CN201210507350A CN102984875B CN 102984875 B CN102984875 B CN 102984875B CN 201210507350 A CN201210507350 A CN 201210507350A CN 102984875 B CN102984875 B CN 102984875B
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Abstract
The invention relates to a xenon lamp power source for an instrument, which comprises a liquid crystal display (LCD) screen, a key, a xenon lamp power source, and a xenon lamp body formed by a high voltage trigger of a xenon lamp and the xenon lamp, wherein the key is used for inputting a xenon lamp control current set value to the xenon lamp power source, and the xenon lamp control current set value is displayed by the LCD screen; the xenon lamp power source is used for igniting and triggering the xenon lamp body according to the xenon lamp control current value, and comprises a power source conversion circuit, and a liquid crystal interface circuit and a key interface circuit which are used for being connected with the LCD screen and the key; the xenon lamp control circuit value input by the key is input into a single chip microcomputer (SCM); the power source conversion circuit is externally connected with a 24V direct current power source; a constant current switching circuit is used for switching a cathode of the xenon lamp body to be connected with the 24V power source under the control of the SCM; an igniting and triggering module works to ignite the xenon lamp body; after the xenon lamp is ignited, the xenon lamp body enters a constant current working mode; a xenon lamp working voltage collection module transmits collected xenon lamp working voltage into the SCM, and the working voltage of the xenon lamp is displayed by the LCD screen after being processed by the SCM. The xenon lamp power source can be widely applied to power supply to various xenon lamps.
Description
Technical field
The present invention relates to a kind of xenon lamp power supply, particularly about a kind of instrument xenon lamp power supply.
Background technology
The spectral region of xenon lamp is wider, and its spectrum covers 200nm to 2000nm scope, and is continuous spectrum.In the ultraviolet portion of 200nm～400nm, xenon lamp spectrum is continuous spectrum, in the visible region of 400～700nm, the black body radiation of xenon lamp spectrum and 6200K approaches, emittance is almost equal, and spectral characteristic does not change with light source power substantially, and within the scope of this, xenon source can be good at simulated solar spectrum.But within the scope of 450nm and 700nm, be superimposed with discrete spectral line, this discrete spectral line is the xenon atom line spectrum that transition is sent in higher energy level; In the near infrared region of 800～1000nm, atomic features spectral line has superposeed on continuous spectrum.Because xenon lamp spectral limit is wide, spectral line is continuous, in Spectrum testing systems, has a wide range of applications.Lighting of xenon source, need between the anode of xenon lamp and negative electrode, add 3kV high pressure, make to produce glow discharge between anode and negative electrode, make anode and negative electrode conducting, and then add low-voltage dc power supply between anode and negative electrode, make it in continuous luminous state.The power ratio of xenon source is larger, need to adopt fan to dispel the heat to xenon lamp lamp body, after power-off, unaffected in order to ensure the life-span of xenon lamp, should after power-off, continue xenon lamp lamp body to dispel the heat, and extends the xenon lamp life-span.The general use high voltage package moment generation 3KV high pressure of lighting of xenon lamp makes anode and cathodic discharge.High voltage package requires input 80V～100V direct current, by multiplication of voltage step by step, voltage is risen to 3KV.Most instrument adopt transformer by 220V alternating current step-down value 80V with xenon lamp power supply, then offer high voltage package by producing 100V direct current after diode and electric capacity rectifying and wave-filtering, circuits for triggering volume and weight are all larger, use this ignition circuit to occur sometimes situation about cannot light, reason is that capacitor charging does not reach the just generation electric discharge of the desired input voltage of high voltage package, namely electric capacity discharging in advance, the trigger voltage deficiency that causes high voltage package to produce, cannot triggered as normal.Xenon lamp is lighted the control of rear general employing constant voltage, but is all to regulate xenon lamp luminosity by potentiometer at present.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of electric current that flows through xenon lamp of realizing and there is stability, and can effectively avoid lighting the instrument xenon lamp power supply of xenon lamp problem.
For achieving the above object, the present invention takes following technical scheme: a kind of instrument xenon lamp power supply, is characterized in that: it comprises LCDs, button, xenon lamp power supply and xenon lamp lamp body, and described xenon lamp lamp body is made up of xenon-lamp high-pressure trigger and xenon lamp; Described button is inputted xenon lamp control current setting value in described xenon lamp power supply, shows current setting value by described LCDs; Described xenon lamp power supply is lighted and is triggered described xenon lamp lamp body; Described xenon lamp power supply comprises power converting circuit, liquid crystal interface circuit, keystroke interface circuit, single-chip microcomputer, lights circuits for triggering, constant-current control module, xenon lamp operating voltage acquisition module, constant current commutation circuit and xenon lamp interface; Described liquid crystal interface circuit is respectively used to be connected described LCDs and button with keystroke interface circuit, and the xenon lamp control current value of described key-press input is inputted in described single-chip microcomputer; The external 24V direct-current switch power supply of described power converting circuit, converts 24V dc source to 5V supply voltage and 3.3V supply voltage; Described constant current commutation circuit, under described Single-chip Controlling, switches to direct connection 24V power supply ground by the negative electrode of described xenon lamp lamp body, lights trigger module work by described in described Single-chip Controlling, lights described xenon lamp lamp body by described xenon lamp interface; After xenon lamp in described xenon lamp lamp body is lighted, described constant current commutation circuit, under described Single-chip Controlling, switches to the negative electrode of described xenon lamp lamp body the control end that connects described constant-current control module, and described xenon lamp lamp body enters constant current mode of operation; Described xenon lamp operating voltage acquisition module transfers to the xenon lamp operating voltage collecting in described single-chip microcomputer, is shown the operating voltage of xenon lamp after described single-chip microcomputer is processed by described LCDs.
Describedly state xenon lamp power supply and the separate setting of described xenon lamp lamp body, adopt multi-core cable and aviation plug to connect between the two
The described circuits for triggering of lighting comprise the booster circuit being made up of to the 3rd resistance, first triode, power NMOS pipe, first inductance and first diode first, by first electric capacity, the 4th resistance, PMOS pipe, the 5th resistance and the 4th charge/discharge control circuit that triode forms, what be made up of NMOS pipe prevents back discharge circuit, the charging voltage observation circuit being formed by the 7th, the 8th resistance and amplifier, by the 9th resistance and the 3rd filter circuit that electric capacity forms, and the 6th resistance and second electric capacity, described booster circuit and charging voltage observation circuit form charging circuit, 24V direct current is risen to 100V by described booster circuit, and described inductance one end is connected between 24V power supply and second resistor, another terminating diode of described inductance, while powering on, the 5th resistance one end in described charge/discharge control circuit connects the base stage of described the 4th triode, the other end connects the IO mouth of described single-chip microcomputer, described single-chip microcomputer is controlled described the 4th triode cut-off by IO mouth, make the grid voltage of described PMOS pipe identical with source class voltage, the source electrode of described PMOS pipe and the not conducting that drains, simultaneously, described first resistance one end connects the base stage of described first triode, the other end connects the PWM output pin of described single-chip microcomputer, by described Single-chip Controlling output pwm signal, be enlarged into through described first triode the pwm signal that amplitude is 24V, then carry out power amplification by described power NMOS pipe, conducting and cut-off through described power NMOS pipe make described inductance produce self induction electromotive force, and be described first capacitor charging by described diode, after the voltage dividing potential drop at first electric capacity two ends being followed by described charging voltage observation circuit and filter circuit, be transformed to the input voltage range of AD converter in described single-chip microcomputer, by its inner AD converter of described Single-chip Controlling, the voltage signal after changing is gathered, and magnitude of voltage is judged, if magnitude of voltage reaches 100V, described Single-chip Controlling stops output pwm signal, and control IO mouth output low level, described first triode and all cut-offs of power NMOS pipe, described charging circuit quits work, described in described Single-chip Controlling, charge/discharge control circuit discharges, and described first electric capacity starts, to described xenon-lamp high-pressure trigger electric discharge, xenon lamp to be lighted, described NMOS pipe is for preventing that the discharge voltage of 100V from entering 24V power supply.
Described constant current commutation circuit comprises the first relay, the second relay, the 6th triode, second diode and by the tenth resistance and the 4th filter circuit that electric capacity forms; Its IO mouth output high level of described Single-chip Controlling, make described the 6th transistor base conducting, by base stage control colelctor electrode to emitter stage conducting, make 24V power supply to described the first relay, the second relay power supply, relay adhesive, now 24V dc source directly provides power supply to described xenon lamp lamp body; Described xenon lamp light after by its IO mouth output low level of described Single-chip Controlling, make described the first relay, the second relay power-off, described constant-current control module work.
Described constant-current control module comprises the voltage follower, constant current backfeed loop and the voltage amplifier circuit that are made up of first operational amplifier; Described constant current backfeed loop comprises that second operational amplifier, the 3rd operational amplifier, resistance, two inductance, two electric capacity, two NOMOS manage and sampling resistor; The setting operating current of described key-press input is converted to after analog signal by the DA converter of described single-chip microcomputer inside, input first operational amplifier positive input of described voltage follower, current controling signal, after described first operational amplifier is followed, is inputted in described constant current backfeed loop; Described the 3rd operational amplifier will be inputted the negative input of described second operational amplifier after the voltage amplification twice at described sampling resistor two ends, after comparing, export control signal by described second operational amplifier with the analog signal of described single-chip microcomputer output; Control signal is inputted after the filter circuit being made up of two inductance and two electric capacity after described resistance, controls the grid voltage of described two NMOS pipes, dynamically adjusts the electric current that flows through xenon lamp, two NMOS pipes and sampling resistor; Described voltage amplifier circuit is made up of the 4th operational amplifier, described the 4th operational amplifier is by after the voltage amplification twice at described sampling resistor two ends, input in described single-chip microcomputer, and with by the given output valve comparison of described button, adjusted the output valve of the DA converter in it by described single-chip microcomputer.
Described sampling resistor adopts that precision is 1%, resistance is the 25W high-power resistance of 0.1 Ω.
Described xenon lamp lamp body adopts upper and lower formula radiator structure, and the upper and lower of described xenon lamp is all provided with 220V radiator fan.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is owing to adopting and lighting circuits for triggering and constant-current control module in xenon lamp power supply, and adopt Single-chip Controlling to light the work of circuits for triggering and constant-current control module, effectively light xenon lamp, and make to flow through the current stabilization of xenon lamp.2, the present invention due to adopt button by the operating current of xenon lamp by key-press input, and shown by LCDs, and the numerical value of the input signal being collected by the PID computing module in single-chip microcomputer and the given output valve of button compare, and compared result is carried out pid control computation, finally adjust the output valve of DA converter in single-chip microcomputer according to PID operation result, the stability of the electric current of xenon lamp is flow through in realization, and can realize the precision digital control of operating current.3, the present invention adopt xenon lamp lamp body adopt upper and lower formula radiator structure, xenon lamp upper and lower is provided with 220V radiator fan, below fan air-supply, above fan exhausting, its good heat dissipation effect.Extensively application in various xenon lamp power supplies of the present invention.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the circuits for triggering structural representation of lighting of the present invention;
Fig. 3 is constant current commutation circuit structural representation of the present invention;
Fig. 4 is constant-current control module structural representation of the present invention;
Fig. 5 is Single-chip Controlling schematic flow sheet of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the present invention includes LCDs 1, button 2, xenon lamp power supply 3 and xenon lamp lamp body 4, xenon lamp lamp body 4 is made up of xenon-lamp high-pressure trigger 41 and xenon lamp 42.In xenon lamp power supply 3, input xenon lamp control current setting value by button 2, and show current setting value by LCDs 1; LCDs 1 also can be used for showing current value or the magnitude of voltage of Real-Time Monitoring when xenon lamp 42 is worked.Xenon lamp power supply 3 is lighted circuits for triggering and is lighted xenon lamp lamp body 4.Xenon lamp power supply 3 and the separate setting of xenon lamp lamp body 4, adopt multi-core cable and aviation plug to connect between the two, is convenient to heat radiation, and can effectively improves antijamming capability.
As shown in Figure 1, xenon lamp power supply 3 comprises power converting circuit 31, liquid crystal interface circuit 32, keystroke interface circuit 33, single-chip microcomputer 34, lights circuits for triggering 35, constant-current control module 36, xenon lamp operating voltage acquisition module 37, constant current commutation circuit 38 and xenon lamp interface 39.The external 24V direct-current switch power supply of power converting circuit 31, convert 24V dc source to 5V supply voltage and 3.3V supply voltage, wherein 3.3V supply voltage provides working power for single-chip microcomputer 34 and peripheral circuit thereof, and 5V supply voltage provides working power for the interior partial simulation circuit of xenon lamp power supply 3.Liquid crystal interface circuit 32 and keystroke interface circuit 33 are respectively used to connecting fluid crystal display screen 1 and button 2, in the xenon lamp control current value input single-chip microcomputer 34 of being inputted by button 2.In single-chip microcomputer 34, preset digital PID operation module, single-chip microcomputer 34 is controlled constant current commutation circuit 38 and is worked, the negative electrode of xenon lamp lamp body 4 is switched to direct connection 24V power supply ground, then light trigger module 35 by single-chip microcomputer 34 controls and work, light xenon lamp lamp body 4 by xenon lamp interface 39; After xenon lamp 42 is lighted, constant current commutation circuit 38 is under single-chip microcomputer 34 is controlled, the negative electrode of xenon lamp lamp body 4 is switched to the control end that connects constant-current control module 36, xenon lamp lamp body 4 enters constant current mode of operation, and single-chip microcomputer 34 is realized the constant current control to xenon lamp 42 operating currents by controlling constant-current control module 36.When xenon lamp is normally worked, LCDs 1 acquiescence shows the operating current that flows through xenon lamp, in the time that button 2 is selected to show xenon lamp operating voltage, xenon lamp operating voltage acquisition module 37 transfers to the xenon lamp collecting 42 operating voltages in single-chip microcomputer 34, is shown the operating voltage of xenon lamp 42 by single-chip microcomputer 34 after processing by LCDs 1.
In above-described embodiment, be illustrated in figure 2, light circuits for triggering 35 and comprise the booster circuit 351 being formed by three resistance R 1～R3, NPN type triode Q1, power NMOS pipe Q2, inductance L 1 and diode D1, the charge/discharge control circuit 352 being formed by capacitor C 1, resistance R 4, PMOS pipe Q3, resistance R 5 and NPN type triode Q4, what be made up of NMOS pipe Q5 prevents back discharge circuit 353, by resistance R 7, the charging voltage observation circuit 354 that R8 and amplifier U1 form, the filter circuit 355 being formed by resistance R 9 and capacitor C 3, and resistance R 6 and capacitor C 2.Wherein, booster circuit 351 and charging voltage observation circuit 354 form charging circuit.
Booster circuit 351 is for 24V direct current is risen to 100V, and inductance L 1 one end is connected between 24V power supply and resistance R 2, and storage power while being low level for the pwm signal of exporting at single-chip microcomputer 34 discharges the energy storing in the time that pwm signal is high level.Inductance L 1 another terminating diode D1, prevents the electric charge reverse flow in the interior capacitor C 1 of charge/discharge control circuit 352, and the voltage of capacitor C 1 is constantly raise, and prevents that the high pressure in capacitor C 1 from entering 24V power supply simultaneously, causes power supply to damage.In the time that circuit starts to power on, the base stage of resistance R 5 one end connecting triode Q4 in charge/discharge control circuit 352, the other end connects the IO mouth of single-chip microcomputer 34, ended by IO mouth control triode Q4 by single-chip microcomputer 34, make the grid voltage of PMOS pipe Q3 identical with source class voltage, source electrode and the not conducting that drains of PMOS pipe Q3.Simultaneously, the base stage of resistance R 1 one end connecting triode Q1, the other end connects the PWM output pin of single-chip microcomputer 34, controlling output duty cycle by single-chip microcomputer 34 is 80% pwm signal, single-chip microcomputer 34 output pwm signals are that amplitude is the signal of 3.3V, be enlarged into through triode Q1 the pwm signal that amplitude is 24V, then carry out power amplification by power NMOS pipe Q2, conducting and cut-off through power NMOS pipe Q2 make inductance L 1 produce self induction electromotive force, and be that capacitor C 1 is charged by diode D1, by resistance R 7, resistance R 8, the charging voltage observation circuit 354 of amplifier U1 composition and filter circuit 355 are transformed to the input voltage range of single-chip microcomputer 34 interior AD converters after the voltage dividing potential drop at capacitor C 1 two ends is followed, controlling its inner AD converter by single-chip microcomputer 34 gathers the voltage signal after changing, and obtain the magnitude of voltage at capacitor C 1 two ends by calculating, then judge calculating acquisition magnitude of voltage, if magnitude of voltage reaches 100V, control and stop output pwm signal by single-chip microcomputer 34, single-chip microcomputer 34 is controlled IO mouth output high level, triode Q1 conducting, the grounded-grid of power NMOS pipe Q2, also in cut-off state, charging circuit quits work, then single-chip microcomputer 34 starts controlled discharge control circuit 352 and discharges.Started to discharge to xenon-lamp high-pressure trigger 41 by capacitor C 1, xenon lamp 42 is lighted, NMOS pipe Q5 can prevent that the discharge voltage of 100V from entering 24V power supply, burns out power supply simultaneously.Resistance R 6 bleeds off the capacitor C 1 remaining electric charge in two ends after PMOS pipe Q3 closes.
When charge/discharge control circuit 352 is worked, export high level by the IO mouth of single-chip microcomputer 34 by resistance R 5, triode Q4 conducting, the grounded-grid of PMOS pipe Q3, the source electrode of PMOS pipe Q3 and drain electrode conducting, capacitor C 1 starts, to high voltage package electric discharge, xenon lamp lamp body 4 to be lighted; NMOS pipe Q5 can prevent that the discharge voltage of 100V from entering 24V power supply, burns out power supply simultaneously.After xenon lamp lamp body 4 is lighted, between the anode of xenon lamp lamp body 4 and negative electrode, form galvanic circle, 24V power supply can provide power supply in time by power NMOS pipe Q5 again.After discharge circuit work, gathered the voltage signal at sampling resistor two ends in constant-current control module 36 by its inner AD converter by single-chip microcomputer 34, if the magnitude of voltage that AD converter collects is greater than 0.5V, illustrate that xenon lamp 42 lighted, then single-chip microcomputer 34 is controlled and is entered constant current control working stage; If the magnitude of voltage that AD converter collects is less than 0.5V, illustrate that xenon lamp 42 do not light, single-chip microcomputer 34 is controlled charging circuit and is reworked capacitor C 1 is charged again, and the rear electric discharge of having charged, to light xenon lamp 42.
In the various embodiments described above, as shown in Figure 3, charge/discharge control circuit 352 starts, before electric discharge, to control constant current commutation circuit 38 work by single-chip microcomputer 34.Constant current commutation circuit 38 comprises the first relay R L1, the second relay R L2, triode Q6, diode D2 and the filter circuit being made up of resistance R 10 and capacitor C 4.Single-chip microcomputer 34 is controlled the first relay R L1, the second relay R L2 switches to the direct power supply state of 24V, switches back constant current duty after xenon lamp 42 is lighted again.Switching to the direct power supply of 24V is to control its IO mouth output high level by single-chip microcomputer 34, makes the base stage conducting of triode Q6, to emitter stage conducting, makes 24V power supply to the first relay R L1, the second relay R L2 power supply, relay adhesive by base stage control colelctor electrode.Now there is 24V dc source directly to provide power supply to xenon lamp lamp body 4, do not carry out constant current control, after xenon lamp 42 is lighted, control its IO mouth output low level by single-chip microcomputer 34 again, make the first relay R L1, the second relay R L2 power-off, constant-current control module 36 is worked, and enters constant current duty.
In the various embodiments described above, as shown in Figure 4, constant-current control module 36 triggers after lighting and starts working at xenon lamp, and xenon lamp light after its operating current can regulate by button 2, adopt LCDs 1 to show current xenon lamp operating current; And the digital PID control constant-current characteristics of controlling by single-chip microcomputer 34, further improve the stability of xenon lamp work.Constant-current control module 6 comprises the voltage follower 61, constant current backfeed loop 62 and the voltage amplifier circuit 63 that are made up of first operational amplifier U2; Wherein, constant current backfeed loop 62 comprises second operational amplifier U3, the 3rd operational amplifier U4, two inductance L 2 and L3, two capacitor C 5 and C6, two NMOS pipe Q7 and Q8, sampling resistor R11 and resistance R 12.The setting operating current of being inputted by button 2 is converted to after analog signal by the DA converter of single-chip microcomputer 34 inside, first operational amplifier U2 positive input of following by inputting voltages device 61, first operational amplifier U2 plays input and output impedance matching effect in constant-current control module 36, current controling signal is after first operational amplifier U2 follows, in input constant current backfeed loop 62, current controling signal inputs to the positive input of second operational amplifier U3 through resistance R 13.The 3rd operational amplifier U4 will input the negative input of second operational amplifier U3 after the voltage amplification twice at sampling resistor R11 two ends, after the analog signal of exporting with single-chip microcomputer 34 compares by second operational amplifier U3 output control signal; Control signal is inputted after the filter circuit being made up of two inductance L 2, L3 and two capacitor C 5, C6 after resistance R 12, control the grid voltage of NMOS pipe Q7, Q8, dynamically adjust the electric current that flows through xenon lamp, NMOS pipe Q7, Q8 and sampling resistor R11,2 times of values that maintain the voltage at sampling resistor R11 two ends equate with the magnitude of voltage of the interior DA converter output of single-chip microcomputer 34.Voltage amplifier circuit 63 is made up of the 4th operational amplifier U5, the 4th operational amplifier U5 is by after the voltage amplification twice at sampling resistor R11 two ends, the analog input pin of input single-chip microcomputer 34, completes the analog-to-digital conversion to this input signal by single-chip microcomputer 34 by inner analog-digital converter.PID computing module in single-chip microcomputer 34 is by comparing the given output valve of the numerical value (i.e. the 4th operational amplifier U4) of the input signal gathering and button 2, and compared result is carried out pid control computation, finally adjust the output valve of the interior DA converter of single-chip microcomputer 34 according to PID operation result, thereby realize the stability of the electric current that flows through xenon lamp.
Wherein, sampling resistor R11 is the sampling resistor of 1% precision, resistance 0.1 Ω, and owing to flowing through, the electric current of sampling resistor R11 is very large, and therefore sampling resistor R11 of the present invention adopts 25W high-power resistance.
In above-described embodiment, lighting circuits for triggering 35 is all with identical 24V dc source with constant-current control module 36, adopts DC boosting that direct current 24V is risen to 100V, charges to capacitor C 1.Capacitor C 1 is full of after electricity, is controlled and is connected xenon-lamp high-pressure trigger 41 by single-chip microcomputer 34, and capacitor C 1 is discharged to xenon-lamp high-pressure trigger 41, and xenon-lamp high-pressure trigger 41 produces 3KV high pressure thus, and xenon lamp 42 is triggered and lighted.
In the various embodiments described above, xenon lamp lamp body 4 adopts upper and lower formula radiator structure, and the upper and lower of light source xenon lamp 42 is all provided with 220V radiator fan, is positioned at fan below for air-supply, is positioned at fan above for exhausting, has good heat radiation effect.The present invention also adopts increases multi-disc infrared spectrum colour filter in the light path system of xenon lamp lamp body 4, a large amount of infrared lights of filtering, and farthest filtering infrared spectrum, adopts adjustable focal length design, can adjust according to service condition the focus of xenon lamp 42 output light sources.
In the various embodiments described above, as shown in Figure 5, after single-chip microcomputer 34 works on power, its course of work is as follows:
1) first initialize, comprise the initialization of work clock, serial line interface, timer, input/output port, AD converter and the DA converter of single-chip microcomputer 34.
2) control PWM module and carry out work, by PWM output pin output pwm signal, by charging circuit, capacitor C 1 is charged, after charging finishes, enter control of discharge program, control the first relay R L1, the second relay R L2 action, capacitor C 1 is discharged, xenon lamp 42 is lighted, gather sampling resistor R11 both end voltage simultaneously, if magnitude of voltage is greater than 0.5V, single-chip microcomputer 34 carries out constant current control working procedure, and monitor actuation of keys, if do not lighted, repeat charging and discharging program 5 times, if still do not lighted, think xenon lamp 42 faults, program exits.Xenon lamp 42 light laggard enter main circulating program, main circulating program is responsible for the pid control computation in input command and the single-chip microcomputer 34 of inquiry keyboard 2, the Interruption service routine of timer is responsible for carrying out keyboard scan task, at interval of 100 milliseconds of run-down key-press status, if having button presses, preserve a front key value to variable OldKey, preserve new key value to NewKey, if the key value of double scanning button is identical, think and have new button to press, keyboard-coding is deposited in KeyCode variable.Main program has judged whether that according to the value of KeyCode variable button presses, if KeyCode is 0xFF, representing does not have button to press, if the value of KeyCode is not 0xFF, there is button to press, and enter corresponding processing program according to key value, after handling procedure exits, KeyCode is reverted to 0xFF, to receive button next time.
Wherein, pid control computation process is: after xenon lamp power supply 3 powers on, first controlled and lighted circuits for triggering 35 and trigger xenon-lamp high-pressure trigger 41 and work by single-chip microcomputer 34, by xenon-lamp high-pressure trigger 41, xenon lamp 42 is lighted; Then xenon lamp circuits for triggering 35 quit work, constant-current control module 36 enters duty simultaneously, the stability of electric current while work in order further to improve xenon lamp 42, adopt digital PID operation dynamically to adjust the output valve of DA converter, make to flow through the electric current of xenon lamp 42 and the relative error of setting value remains in constant scope.Xenon lamp power supply 3 enters after constant current duty, single-chip microcomputer 34 constantly gathers sampling resistor R11 both end voltage value by the integrated AD converter in inside, and this magnitude of voltage process is calculated to the working current value that is converted to xenon lamp 42, then compare with setting value, calculate the error obtaining between real work current value and setting value, calculate and obtain correction value by increment type PID computing, the setting value of this correction value and current DA converter is added, and the result of addition is used for resetting the output valve of DA converter.The increment type PID algorithm formula that wherein PID computing adopts is:
U
k＝K
p×E
k+K
i×E
k-1+K
d×E
k-2，
In formula, K
pfor proportionality coefficient, value is 0.9; K
ifor integral coefficient, value is 0.6; K
dfor differential coefficient, value is 0.E
k, E
k-1, E
k-2be respectively the sampled value of operating current that setting value and AD converter gather xenon lamp in the time of t-2, error amount when t-1 and when t, t is current time.
In sum, the present invention in use, sets current value and actual measurement voltage or current value because xenon lamp power supply 3 adopts LCDs 1, has realized accurate digital current and has regulated.Checking, has reached good constant current control effect by experiment, and after the normal work of xenon lamp 42, the undulating value of its anode and negative electrode both end voltage is 100mV.
The various embodiments described above are only for illustrating the present invention; the connection of each parts and structure all can change to some extent; on the basis of technical solution of the present invention; all improvement and equivalents that according to the principle of the invention, the connection to indivedual parts and structure are carried out, all should not get rid of outside protection scope of the present invention.
Claims (7)
1. an instrument xenon lamp power supply, is characterized in that: it comprises LCDs, button, xenon lamp power supply and xenon lamp lamp body, and described xenon lamp lamp body is made up of xenon-lamp high-pressure trigger and xenon lamp; Described button is inputted xenon lamp control current setting value in described xenon lamp power supply, shows current setting value by described LCDs; Described xenon lamp power supply is lighted and is triggered described xenon lamp lamp body;
Described xenon lamp power supply comprises power converting circuit, liquid crystal interface circuit, keystroke interface circuit, single-chip microcomputer, lights circuits for triggering, constant-current control module, xenon lamp operating voltage acquisition module, constant current commutation circuit and xenon lamp interface; Described liquid crystal interface circuit is respectively used to be connected described LCDs and button with keystroke interface circuit, and the xenon lamp control current value of described key-press input is inputted in described single-chip microcomputer; The external 24V direct-current switch power supply of described power converting circuit, converts 24V dc source to 5V supply voltage and 3.3V supply voltage; Described constant current commutation circuit, under described Single-chip Controlling, switches to direct connection 24V power supply ground by the negative electrode of described xenon lamp lamp body, lights circuits for triggering work by described in described Single-chip Controlling, lights described xenon lamp lamp body by described xenon lamp interface; After xenon lamp in described xenon lamp lamp body is lighted, described constant current commutation circuit, under described Single-chip Controlling, switches to the negative electrode of described xenon lamp lamp body the control end that connects described constant-current control module, and described xenon lamp lamp body enters constant current mode of operation; Described xenon lamp operating voltage acquisition module transfers to the xenon lamp operating voltage collecting in described single-chip microcomputer, is shown the operating voltage of xenon lamp after described single-chip microcomputer is processed by described LCDs.
2. a kind of instrument xenon lamp power supply as claimed in claim 1, is characterized in that: described xenon lamp power supply and the separate setting of described xenon lamp lamp body, adopt multi-core cable and aviation plug to connect between the two.
3. a kind of instrument xenon lamp power supply as claimed in claim 1, it is characterized in that: described in light circuits for triggering and comprise by first to the 3rd resistance, first triode, power NMOS pipe, the booster circuit that first inductance and first diode form, by first electric capacity, the 4th resistance, PMOS pipe, the 5th resistance and the 4th charge/discharge control circuit that triode forms, what be made up of NMOS pipe prevents back discharge circuit, by the 7th, the charging voltage observation circuit that the 8th resistance and amplifier form, by the 9th resistance and the 3rd filter circuit that electric capacity forms, and the 6th resistance and second electric capacity, described booster circuit and charging voltage observation circuit form charging circuit,
24V direct current is risen to 100V by described booster circuit, and described inductance one end is connected between 24V power supply and second resistor, another terminating diode of described inductance, while powering on, the 5th resistance one end in described charge/discharge control circuit connects the base stage of described the 4th triode, the other end connects the IO mouth of described single-chip microcomputer, described single-chip microcomputer is controlled described the 4th triode cut-off by IO mouth, make the grid voltage of described PMOS pipe identical with source class voltage, the source electrode of described PMOS pipe and the not conducting that drains, simultaneously, described first resistance one end connects the base stage of described first triode, the other end connects the PWM output pin of described single-chip microcomputer, by described Single-chip Controlling output pwm signal, be enlarged into through described first triode the pwm signal that amplitude is 24V, then carry out power amplification by described power NMOS pipe, conducting and cut-off through described power NMOS pipe make described inductance produce self induction electromotive force, and be described first capacitor charging by described diode, after the voltage dividing potential drop at first electric capacity two ends being followed by described charging voltage observation circuit and filter circuit, be transformed to the input voltage range of AD converter in described single-chip microcomputer, by its inner AD converter of described Single-chip Controlling, the voltage signal after changing is gathered, and magnitude of voltage is judged, if magnitude of voltage reaches 100V, described Single-chip Controlling stops output pwm signal, and control IO mouth output low level, described first triode and all cut-offs of power NMOS pipe, described charging circuit quits work, described in described Single-chip Controlling, charge/discharge control circuit discharges, and described first electric capacity starts, to described xenon-lamp high-pressure trigger electric discharge, xenon lamp to be lighted, described NMOS pipe is for preventing that the discharge voltage of 100V from entering 24V power supply.
4. a kind of instrument xenon lamp power supply as claimed in claim 1, is characterized in that: described constant current commutation circuit comprises the first relay, the second relay, the 6th triode, second diode and by the tenth resistance and the 4th filter circuit that electric capacity forms; Its IO mouth output high level of described Single-chip Controlling, make described the 6th transistor base conducting, by base stage control colelctor electrode to emitter stage conducting, make 24V power supply to described the first relay, the second relay power supply, relay adhesive, now 24V dc source directly provides power supply to described xenon lamp lamp body; Described xenon lamp light after by its IO mouth output low level of described Single-chip Controlling, make described the first relay, the second relay power-off, described constant-current control module work.
5. a kind of instrument xenon lamp power supply as claimed in claim 1, is characterized in that: described constant-current control module comprises the voltage follower, constant current backfeed loop and the voltage amplifier circuit that are made up of first operational amplifier; Described constant current backfeed loop comprises that second operational amplifier, the 3rd operational amplifier, resistance, two inductance, two electric capacity, two NOMOS manage and sampling resistor; The setting operating current of described key-press input is converted to after analog signal by the DA converter of described single-chip microcomputer inside, input first operational amplifier positive input of described voltage follower, current controling signal, after described first operational amplifier is followed, is inputted in described constant current backfeed loop; Described the 3rd operational amplifier will be inputted the negative input of described second operational amplifier after the voltage amplification twice at described sampling resistor two ends, after comparing, export control signal by described second operational amplifier with the analog signal of described single-chip microcomputer output; Control signal is inputted after the filter circuit being made up of two inductance and two electric capacity after described resistance, controls the grid voltage of described two NMOS pipes, dynamically adjusts the electric current that flows through xenon lamp, two NMOS pipes and sampling resistor; Described voltage amplifier circuit is made up of the 4th operational amplifier, described the 4th operational amplifier is by after the voltage amplification twice at described sampling resistor two ends, input in described single-chip microcomputer, and with by the given output valve comparison of described button, adjusted the output valve of the DA converter in it by described single-chip microcomputer.
6. a kind of instrument xenon lamp power supply as claimed in claim 5, is characterized in that: described sampling resistor adopts that precision is 1%, resistance is the 25W high-power resistance of 0.1 Ω.
7. a kind of instrument xenon lamp power supply as claimed in claim 1, is characterized in that: described xenon lamp lamp body adopts upper and lower formula radiator structure, and the upper and lower of described xenon lamp is all provided with 220V radiator fan.
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| CN201210507350.8A CN102984875B (en) | 2012-11-30 | 2012-11-30 | Xenon lamp power source for instrument |
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| CN201210507350.8A CN102984875B (en) | 2012-11-30 | 2012-11-30 | Xenon lamp power source for instrument |
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| CN102984875B true CN102984875B (en) | 2014-08-06 |
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| CN103486470B (en) * | 2013-09-17 | 2015-06-24 | 河北科技大学 | Highly converged high-power adjustable solar simulation equipment |
| CN104797065B (en) * | 2015-04-10 | 2018-05-01 | 浙江宇光照明科技有限公司 | A kind of nonpolar lamp circuit |
| CN104980038A (en) * | 2015-07-10 | 2015-10-14 | 广州彩熠灯光有限公司 | Combustion-supporting voltage circuit for high-power xenon lamp |
| CN107623978B (en) * | 2017-09-22 | 2024-01-05 | 中国科学院西安光学精密机械研究所 | Expandable air-cooled long-arc xenon lamp array control device and method |
| CN112543528A (en) * | 2020-12-17 | 2021-03-23 | 中电科仪器仪表(安徽)有限公司 | Xenon lamp triggering device and control method |
| CN114096030A (en) * | 2021-12-23 | 2022-02-25 | 深圳市海洋王绿色照明技术有限公司 | High-power short-arc xenon lamp driving power supply and method |
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| CN2140128Y (en) * | 1992-09-25 | 1993-08-11 | 中国民用航空学院 | Portable show xenon lamp power |
| CN2250622Y (en) * | 1995-09-13 | 1997-03-26 | 杨作峰 | Pulse xenon lamp power source |
| CN2896787Y (en) * | 2006-03-30 | 2007-05-02 | 陈锡鹏 | High-performance xenon lamp dc. power supply |
| CN202979433U (en) * | 2012-11-30 | 2013-06-05 | 北京信息科技大学 | Xenon lamp power supply for instrument |
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Application publication date: 20130320 Assignee: Tinglu (Beijing) Technology Co.,Ltd. Assignor: BEIJING INFORMATION SCIENCE AND TECHNOLOGY University Contract record no.: X2022990000935 Denomination of invention: A xenon lamp power supply for instrument Granted publication date: 20140806 License type: Common License Record date: 20221111 |