CN101861039A

CN101861039A - Control circuit of metal halide headlamp of digitized locomotive

Info

Publication number: CN101861039A
Application number: CN201010156082A
Authority: CN
Inventors: 虞兴保
Original assignee: NANJING ZHONGSEN TAISHENG ELECTROMECHANICAL INDUSTRY Co Ltd
Current assignee: NANJING ZHONGSEN TAISHENG ELECTROMECHANICAL INDUSTRY Co Ltd; Wang Chuanfang
Priority date: 2010-04-23
Filing date: 2010-04-23
Publication date: 2010-10-13
Anticipated expiration: 2030-04-23
Also published as: CN101861039B

Abstract

The invention relates to a control circuit of a front metal halide headlamp, in particular to a control circuit of a metal halide headlamp of a digitized locomotive, which mainly consists of the following five parts: an input circuit carries out rectification filtering on input voltage and inhibits an electromagnetic wave; an APFC grade outputs 400V DC voltage as the input voltage of the DC/DC-grade; a DC/DC grade carries out power processing; a DC/AC grade changes DC into AC, the drive of an IGBT tube thereof is realized by outputting a low-frequency sweeping square wave with 50% of a fixed duty ratio through the I/O port of a single-chip microprocessor; a secondary trigger is used for generating a high pressure to start up an HID lamp; and a digital controller is used for realizing voltage, current and power control and abnormal condition protection. The control circuit can achieve the cold-hot startup of a lamp tube, adopts the working mode of utilizing low-frequency to sweep square wave, avoids the acoustical resonance phenomena of a metal halide, and realizes matching of different load characteristics in different stages of ballasts and the lamp.

Description

Control circuit of metal halide headlamp of digitized locomotive

Technical field

The present invention relates to a kind of control circuit of preceding metal halide lamp, a kind of specifically control circuit of metal halide headlamp of digitized locomotive.

Background technology

Along with fast development of national economy, track traffic cause and technology constantly develop, trunk railway, high-speed railway, inter-city passenger rail, local railway, subterranean railway rapid growth, be accompanied by people's the improving constantly of living standard, people are more and more higher to the requirement of the safety of the vehicles of trip, comfortableness.Because safe, efficient railway network forms gradually, railroad train will become the trip instrument of people's first-selection.Therefore, safe and reliable railway product will be research staff's a responsibility for it.

What present most of headlight of railroad locomotive used is tungsten halogen lamp, also has the part locomotive still to use mercury xenon lamp.Last century early eighties, mercury xenon lamp is promptly opened welcome promptly bright, that the light efficiency advantage of higher is subjected to the locomotive work personnel with it.But, owing between mercury xenon lamp and the daylight sizable difference is arranged, blue-green light is more intense, color rendering is bad, color distortion, the locomotive work personnel may produce wrong judgement to the object in locomotive the place ahead and signal lamp color, thus the Ministry of Railways last century the nineties begin to promote tungsten halogen lamp.Tungsten halogen lamp is a heat radiation light source, and volume is little, in light weight, color rendering is good, has solved effectively that the mercury xenon lamp color rendering is bad, the drawback of color distortion.Specific power is big mutually, brightness is low, light efficiency is low but tungsten halogen lamp is with mercury xenon lamp, and light efficiency has only half of mercury xenon lamp, and the life-span is short, and irradiation distance is near.Along with the continuous development of China railways technology, experienced six extensive speed-raisings in recent years, the light source of original locomotive headlamp can not satisfy the demand after the speed-raising.Metal halide lamp is a kind of high-intensity gas discharge lamp, be confirmed to be is one of " light source product that 21 century is the most promising ", it has overcome the deficiency of mercury xenon lamp and tungsten halogen lamp existence, the advantage that has mercury xenon lamp and tungsten halogen lamp simultaneously has advantages such as volume is little, light efficiency is high, irradiation distance is far away, color rendering is good, the life-span is long, energy-conserving and environment-protective.But, because complicated start-up course and sequencing control requirement, existing metal halide lamp control circuit often seem trouble and complexity, under high frequency, work and be easy to generate the acoustic resonance phenomenon, make lamp electric arc instability, light flash, even extinguish, can damage discharge tube when serious, damage the life-span of lamp greatly.

Therefore, application and the popularization of metal halide lamp on headlight of railroad locomotive is the trend of locomotive development, meet the Ministry of Railways in introducing external locomotive production domesticization process " introduce, digestion, absorb, innovation " aim and the requirement of TB/T2325.1-2006 locomotive headlamp new standard, development high-tech, quality product substitute import, progressively realize production domesticization, improving locomotive night illumination performance and fail safe, cut down the consumption of energy, is one of developing direction of China's track traffic.

Summary of the invention

Technical problem to be solved by this invention is: at the shortcoming of above prior art existence, a kind of control circuit of metal halide headlamp of digitized locomotive is proposed, can realize the cold and hot startup of fluorescent tube, adopt low frequency frequency sweep square wave working method, avoid the acoustic resonance phenomenon of Metal halogen lamp, realize that the different loads characteristic of the different phase of ballast and lamp is complementary.

The technical scheme that the present invention solves above technical problem is:

Control circuit of metal halide headlamp of digitized locomotive, comprise input circuit, the APFC circuit, the DC/DC translation circuit, the DC/AC translation circuit, cpu control circuit and HID lamp, input circuit suppresses input voltage rectifying and wave-filtering and electromagnetic wave to export to the APFC circuit after the processing, output dc voltage was given the DC/DC translation circuit after the APFC circuit carried out the power factor school, output dc voltage was given the DC/AC translation circuit after the DC/DC translation circuit carried out Power Processing, the DC/DC translation circuit is exported to cpu control circuit with current sample and voltage sample simultaneously, the DC/AC translation circuit becomes alternating voltage with direct voltage, accept simultaneously after the control signal of cpu control circuit alternating voltage to be exported to the HID lamp, between DC/DC translation circuit and HID lamp, be connected to secondary circuits for triggering that are used for producing high voltage startup HID lamp, the secondary circuits for triggering comprise a rectifier bridge, two trigger tubes, two inductance, two electric capacity and a diode, two ac input ends of rectifier bridge connect the 200Hz modulated square wave of the output of DC/AC translation circuit, the positive pole of the output of rectifier bridge is connected with first electric capacity and the elementary of first inductance, the negative pole of the output of rectifier bridge is connected with first trigger tube after the resistance current limliting, the secondary positive pole that is connected to diode of first inductance, the negative pole of diode connects an end of second electric capacity and second trigger tube, and the other end of second trigger tube links to each other with an elementary end of second inductance; Behind the rectifier bridge rectifying and wave-filtering, obtain the direct voltage of 400V from the 200Hz modulated square wave of DC/AC circuit, through the first trigger tube conducting, first inductance and first capacitor resonance produce the high frequency waves of about 150kHz, again through second inductance boost, behind diode rectification, obtain direct voltage greater than 5000V, by the second trigger tube conducting, second inductance and second capacitor resonance produce the high frequency waves of about 10MHz, obtain high frequency waves through second inductance boost second inductance secondary again greater than 25kV, described greater than on 25kV high frequency waves and the HID lamp that is added to from the 400V200Hz low-frequency square-wave of DC/AC circuit, the HID lamp is triggered start; Automatically dropped to consistently with the HID modulating voltage afterwards from the 400V of DC/AC circuit 200Hz low-frequency square-wave when the HID lamp starts, two trigger tubes turn-off.

Input circuit and APFC circuit are the available circuit on the HID lamp.The DC/DC translation circuit comprises a transistor, it has base stage, emitter and collector, its base stage connects pulse width modulated drive signal, positive voltage input signal from the APFC circuit connects transistorized collector electrode through an inductance, negative voltage input signal from the APFC circuit connects transistorized emitter through a resistance, be connected to an electric capacity between transistorized emitter and the collector electrode, transistorized emitter output current sampled signal, transistorized collector electrode connects the DC/AC translation circuit through a diode, be connected to an electric capacity between diode and the transistorized emitter, two series resistances in parallel on electric capacity, output voltage sampled signal between resistance and the resistance.

The DC/AC translation circuit is made up of four transistors, it all has base stage, emitter and collector, the emitter-base bandgap grading of the first transistor connects the 3rd transistor collector, the collector electrode of the first transistor connects the collector electrode of transistor seconds, the emitter of transistor seconds connects the 4th transistorized collector electrode, the 4th transistorized emitter connects the 3rd transistorized emitter, the collector electrode of the first transistor, the collector electrode of transistor seconds, the 4th transistorized emitter and the 3rd transistorized emitter connect the DC/DC translation circuit, the emitter-base bandgap grading of the first transistor jointly, the 3rd transistor collector, the emitter of transistor seconds contacts Power Generation Road jointly with the 4th transistorized collector electrode.

Cpu control circuit adopts the STC12C2052AD single-chip microcomputer of 20 pins, and No. 16 pins of single-chip microcomputer connect voltage sampling signal, and No. 13 pins of single-chip microcomputer connect current sampling signal, and single-chip microcomputer connects the DC/AC translation circuit by a slice TL2843EN chip.

The present invention is provided with the secondary circuits for triggering, is respectively applied for the cold start and the hot starting, hot start of fluorescent tube, has guaranteed the starting characteristic of fluorescent tube.

Digital control circuit of the present invention adopts low frequency frequency sweep square wave working method, promptly form by PFC level+DC/DC level+three grades of circuit of low frequency full bridge DC/AC level, avoid the acoustic resonance phenomenon of Metal halogen lamp, adopt digital control method, the different loads characteristic that realizes the different phase of ballast and lamp is complementary, can simplify hardware circuit, overcome the problem of parameters of temperature drift in the analog circuit, and control flexibly.The present invention integrates machinery, digital and electronic, optics high-end technology, adopt short arc warm start metal halide light, digitalized electron ballast, trigger, emphasis solves warm start, acoustic resonance, electromagnetic compatibility technology, play a role not only for locomotive night safe form, and its high brightness, long drive journey, to play certain warning function to pedestrian and vehicle, reach the top standard of the domestic same industry and the advanced level of international counterparts same period, will progressively substitute existing locomotive headlamp.

The present invention will promote the technological innovation of metal halide headlamp of digitized locomotive, the lifting project competitiveness of product in market, for the development of China's track traffic provides new Digital energy-saving illumination electronic equipment, will help railroad and realize that the speed-raising operation improves capacity, cuts down the consumption of energy.

Description of drawings

Fig. 1 is a circuit block diagram of the present invention.

Fig. 2 is the circuit diagram of secondary circuits for triggering.

Fig. 3 is the circuit diagram of DC/DC translation circuit.

Fig. 4 is the circuit diagram of DC/AC translation circuit.

Fig. 5 is the circuit diagram of cpu control circuit.

Embodiment

Embodiment one

Present embodiment is a kind of control circuit of metal halide headlamp of digitized locomotive, its circuit block diagram as shown in Figure 1, comprise input circuit, the APFC circuit, the DC/DC translation circuit, the DC/AC translation circuit, cpu control circuit and HID lamp, input circuit suppresses input voltage rectifying and wave-filtering and electromagnetic wave to export to the APFC circuit after the processing, output dc voltage was given the DC/DC translation circuit after the APFC circuit carried out the power factor school, output dc voltage was given the DC/AC translation circuit after the DC/DC translation circuit carried out Power Processing, the DC/DC translation circuit is exported to cpu control circuit with current sample and voltage sample simultaneously, the DC/AC translation circuit becomes alternating voltage with direct voltage, accept simultaneously after the control signal of cpu control circuit alternating voltage to be exported to the HID lamp, between DC/DC translation circuit and HID lamp, be connected to secondary circuits for triggering that are used for producing high voltage startup HID lamp.Input circuit is with the input voltage rectifying and wave-filtering and carry out electromagnetic inhibition processing; APFC level output 400V direct voltage is as the input voltage of DC/DC level; The DC/DC level is carried out Power Processing; The DC/AC level realizes that direct current becomes interchange, and the driving of its IGBT pipe is that 50% low frequency frequency sweep square wave is realized by the I/O mouth output fixed duty cycle of single-chip microcomputer; The secondary trigger is used for producing high voltage startup HID lamp; Digitial controller is used for realizing voltage, electric current and power control and abnormal condition protection.

The secondary circuits for triggering as shown in Figure 2, comprise a rectifier bridge BG1, two trigger tube CF1 and CF2, two inductance T5 and T6, two capacitor C 5 and C7 and a diode D2, two ac input ends of rectifier bridge BG1 connect the 200Hz modulated square wave of the output of DC/AC translation circuit, the positive pole of the output of rectifier bridge BG1 is connected with first capacitor C 5 and first the elementary of inductance T5, the negative pole of the output of rectifier bridge BG1 is connected with the first trigger tube CF1 after resistance R 100 current limlitings, the secondary positive pole that is connected to diode D2 of the first inductance T5, the negative pole of diode D2 connects the end of second capacitor C 7 and the second trigger tube CF2, and the other end of the second trigger tube CF2 links to each other with the elementary end of the second inductance T6; Behind rectifier bridge BG1 rectifying and wave-filtering, obtain the direct voltage of 400V from the 200Hz modulated square wave of DC/AC circuit, through the first trigger tube CF1 conducting, the first inductance T5 and first capacitor C, 5 resonance produce the high frequency waves of about 150kHz, boost through the second inductance T5 again, after diode D2 rectification, obtain direct voltage greater than 5000V, by the second trigger tube CF2 conducting, the second inductance T6 and second capacitor C, 7 resonance produce the high frequency waves of about 10MHz, boost through the second inductance T6 again and obtain high frequency waves greater than 25kV the second inductance T6 secondary, greater than on 25kV high frequency waves and the HID lamp that is added to from the 400V 200Hz low-frequency square-wave of DC/AC circuit, the HID lamp is triggered start; Automatically dropped to consistently with the HID modulating voltage afterwards from the 400V of DC/AC circuit 200Hz low-frequency square-wave when the HID lamp starts, two trigger tube CF1 and CF2 turn-off.

Input circuit and APFC circuit are the available circuit on the HID lamp, the APFC level is power factor correction, be used for reducing input current harmonics, improve power factor, minimizing is to the pollution of electrical network, return the DC/DC level simultaneously stable input voltage is provided, the voltage that the DC/DC level is exported is not subjected to the influence of grid voltage change, fluorescent tube can normally be started in bigger grid voltage change scope and work, the APFC level adopts booster type BOOST DC/DC converter, its output voltage is decided according to the electrical network maximum output voltage, is generally 420V.

The DC/DC circuit as shown in Figure 3, the DC/DC level can realize power control, circuit is made of ZVRT BUCK circuit, comprise a transistor Q2, its base stage connects pulse width modulated drive signal, connect the collector electrode of transistor Q2 through an inductance L 1 from the positive voltage input signal of APFC circuit, connect the emitter of transistor Q2 through a resistance R 2 from the negative voltage input signal of APFC circuit, be connected to a capacitor C 2 between the emitter of transistor Q2 and the collector electrode, the emitter output current sampled signal of transistor Q2, the collector electrode of transistor Q2 connects the DC/AC translation circuit through a diode D4, be connected to a capacitor C 3 between the emitter of diode D4 and transistor Q2, two series resistance R7 in parallel and R8 on capacitor C 3, output voltage sampled signal between resistance R 7 and the resistance R 8.By regulating inductance parameters; main switch can realize that no-voltage is open-minded; effectively reduce the loss of switching tube in the circuit, this one-level circuit adopts single-chip microcomputer to control, and realizes open-circuit-protection and short-circuit protection, fluorescent tube inefficacy and the loss of ignition protection of constant voltage, unsteady flow and the permanent power and the circuit of output.

The DC/AC circuit adopts full-bridge circuit, circuit as shown in Figure 4, by four transistor Q13, Q14, Q24 and Q27 form, the emitter-base bandgap grading of the first transistor Q13 connects the 3rd transistor Q24 collector electrode, the collector electrode of the first transistor Q13 connects the collector electrode of transistor seconds Q14, the emitter of transistor seconds Q14 connects the collector electrode of the 4th transistor Q27, the emitter of the 4th transistor Q27 connects the emitter of the 3rd transistor Q24, the collector electrode of the first transistor Q13, the collector electrode of transistor seconds Q14, the emitter of the emitter of the 4th transistor Q27 and the 3rd transistor Q24 connects the DC/DC translation circuit jointly, the emitter-base bandgap grading of the first transistor Q13, the 3rd transistor Q24 collector electrode, the collector electrode of the emitter of transistor seconds Q14 and the 4th transistor Q27 contacts Power Generation Road jointly.The DC/AC circuit becomes interchange to the direct voltage of DC/DC level output, makes lamp be operated in low frequency frequency sweep square wave, effectively prevents the polarization of fluorescent tube, the operate as normal that helps lamp, and be operated in low frequency frequency sweep mode, and effectively avoid the acoustic resonance phenomenon of Metal halogen lamp, reduce electromagnetic radiation.

Cpu control circuit adopts the STC12C2052AD single-chip microcomputer of 20 pins as shown in Figure 5, and No. 16 pins of single-chip microcomputer connect voltage sampling signal, and No. 13 pins of single-chip microcomputer connect current sampling signal, and single-chip microcomputer connects the DC/AC translation circuit by a slice TL2843EN chip.The STC12C2052AD single-chip microcomputer, have two timers, 10 bit AD sample precision, especially have two PWM mouths, when operating frequency is 39K, its output accuracy can reach 9, so just can save peripheral D/A converter and special-purpose PWM chip, thereby simplified hardware circuit, this series monolithic pin is few, low price, function is strong, is well to select in the singlechip chip, its concrete parameter is as shown in the table: adopt STC12C2052AD to add high speed photoelectrical coupler CNY17F and discrete component driving, Dead Time and better circuit isolation can be set like this, make the drive waveforms of its output can directly drive two IGBT pipes up and down of BUCK circuit, and simplified the drive circuit of BUCK circuit, solved the problem of BUCK drives difficulty, very simple and convenient, and the logic of this chip input can with the CMOS or the LSTTL output circuit compatibility of standard, can directly drive by the signal that single-chip microcomputer produces fully.

The present invention can also have other execution mode, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.

Claims

1. control circuit of metal halide headlamp of digitized locomotive, comprise input circuit, the APFC circuit, the DC/DC translation circuit, the DC/AC translation circuit, cpu control circuit and HID lamp, described input circuit suppresses input voltage rectifying and wave-filtering and electromagnetic wave to export to the APFC circuit after the processing, output dc voltage was given the DC/DC translation circuit after described APFC circuit carried out the power factor school, output dc voltage was given the DC/AC translation circuit after described DC/DC translation circuit carried out Power Processing, the DC/DC translation circuit is exported to cpu control circuit with current sample and voltage sample simultaneously, described DC/AC translation circuit becomes alternating voltage with direct voltage, accept simultaneously after the control signal of cpu control circuit alternating voltage to be exported to the HID lamp, it is characterized in that: between described DC/AC translation circuit and HID lamp, be connected to secondary circuits for triggering that are used for producing high voltage startup HID lamp, described secondary circuits for triggering comprise a rectifier bridge (BG1), two trigger tubes (CF1 and CF2), two inductance (T5 and T6), two electric capacity (C5 and C7) and a diode (D2), two ac input ends of described rectifier bridge (BG1) connect the output of described DC/AC translation circuit, the elementary connection of the positive pole of the output of described rectifier bridge (BG1) and first electric capacity (C5) and first inductance (T5), the negative pole of the output of described rectifier bridge (BG1) is connected with first trigger tube (CF1) through resistance (R100), the secondary positive pole that is connected to diode (D2) of first inductance (T5), the negative pole of diode (D2) connects an end of second electric capacity (C7) and second trigger tube (CF2), and the other end of second trigger tube (CF2) links to each other with an elementary end of second inductance (T6); Behind rectifier bridge (BG1) rectifying and wave-filtering, obtain the direct voltage of 400V from the 200Hz modulated square wave of DC/AC circuit, through first trigger tube (CF1) conducting, the conducting electric current is limited by resistance (R100), first inductance (T5) and first electric capacity (C5) resonance produce the high frequency waves of about 150kHz, boost through second inductance (T5) again, after diode (D2) rectification, obtain direct voltage greater than 5000V, by second trigger tube (CF2) conducting, second inductance (T6) and second electric capacity (C7) resonance produce the high frequency waves of about 10MHz, boost through second inductance (T6) again and obtain high frequency waves greater than 25kV second inductance (T6) secondary, described greater than on 25kV high frequency waves and the HID lamp that is added to from the 400V 200Hz low-frequency square-wave of DC/AC circuit, the HID lamp is triggered start; Automatically dropped to consistently with the HID modulating voltage afterwards from the 400V of DC/AC circuit 200Hz low-frequency square-wave when the HID lamp starts, described two trigger tubes (CF1 and CF2) turn-off.

2. control circuit of metal halide headlamp of digitized locomotive as claimed in claim 1, it is characterized in that: described DC/DC translation circuit comprises a transistor (Q2), it has base stage, emitter and collector, its base stage connects pulse width modulated drive signal, connect the collector electrode of transistor (Q2) through an inductance (L1) from the positive voltage input signal of APFC circuit, connect the emitter of transistor (Q2) through a resistance (R2) from the negative voltage input signal of APFC circuit, be connected to an electric capacity (C2) between the emitter of transistor (Q2) and the collector electrode, the emitter output current sampled signal of transistor (Q2), the collector electrode of transistor (Q2) connects described DC/AC translation circuit through a diode (D4), be connected to an electric capacity (C3) between the emitter of diode (D4) and transistor (Q2), go up two series resistances (R7 and R8) in parallel, output voltage sampled signal between resistance (R7) and the resistance (R8) at electric capacity (C3).

3. control circuit of metal halide headlamp of digitized locomotive as claimed in claim 1, it is characterized in that: described DC/AC translation circuit is by four transistor (Q13, Q14, Q24 and Q27) form, it all has base stage, emitter and collector, the emitter-base bandgap grading of described the first transistor (Q13) connects the 3rd transistor (Q24) collector electrode, the collector electrode of described the first transistor (Q13) connects the collector electrode of transistor seconds (Q14), the emitter of described transistor seconds (Q14) connects the collector electrode of the 4th transistor (Q27), the emitter of described the 4th transistor (Q27) connects the emitter of the 3rd transistor (Q24), the collector electrode of described the first transistor (Q13), the collector electrode of transistor seconds (Q14), the emitter of the emitter of the 4th transistor (Q27) and the 3rd transistor (Q24) connects described DC/DC translation circuit jointly, the emitter-base bandgap grading of described the first transistor (Q13), the 3rd transistor (Q24) collector electrode, the collector electrode of the emitter of transistor seconds (Q14) and the 4th transistor (Q27) connects described circuits for triggering jointly.

4. control circuit of metal halide headlamp of digitized locomotive as claimed in claim 1, it is characterized in that: described cpu control circuit adopts the STC12C2052AD single-chip microcomputer of 20 pins, No. 16 pins of described single-chip microcomputer connect voltage sampling signal, No. 13 pins of described single-chip microcomputer connect current sampling signal, and described single-chip microcomputer connects the DC/AC translation circuit by a slice TL2843EN chip.