CN102123555A - HID (High Intensity Discharge) lamp electronic ballast and multimode control method thereof - Google Patents
HID (High Intensity Discharge) lamp electronic ballast and multimode control method thereof Download PDFInfo
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- CN102123555A CN102123555A CN2011100880421A CN201110088042A CN102123555A CN 102123555 A CN102123555 A CN 102123555A CN 2011100880421 A CN2011100880421 A CN 2011100880421A CN 201110088042 A CN201110088042 A CN 201110088042A CN 102123555 A CN102123555 A CN 102123555A
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Abstract
The invention discloses an HID (High Intensity Discharge) lamp electronic ballast and a multimode control method thereof, relating to an HID lamp electronic ballast and a multimode control method. The HID lamp electronic ballast provided by the invention comprises a high-frequency DC/DC (direct current/direct current) converter, a DC/AC (direct current/alternating current) inverter, a high-voltage ignition circuit and a control circuit. The multimode control method comprises the following steps of: by comparing the voltage and current of an HID lamp acquired in real time with the reference voltage and current, controlling the output voltage of the HID lamp electronic ballast; calculating an instantaneous power according to the voltage and current of the HID lamp; and comparing the instantaneous power with the set power of the HID lamp, controlling the output power of the HID lamp electronic ballast, and accurately controlling different working stages in the starting process of the HID lamp to realize the reliable and fast start of the HID lamp as well as the capability of smoothly transitioning to a steady operation after the HID lamp is started. In the invention, the reliability for igniting the lamp frequently is high, the time sequence control is accurate, and the ID lamp electronic ballast provided by the invention is suitable for different lamp conditions, and simultaneously has a function of fault protection, so that the service life of the HID lamp is prolonged.
Description
Technical field
The present invention relates to a kind of HID lamp electronic ballast and control method, particularly a kind of HID lamp electronic ballast and multi-mode control method of multi-mode control.
Background technology
High-intensity gas discharge lamp (High Intensity Discharge Lamp) is applied in the automobile front illuminator at present morely.The HID bulb is broken through traditional osram lamp technology, adopts sophisticated technologies that xenon and halide are charged into quartz inner pipe, excites the interior xenon ionization of pipe by high-voltage pulse, forms superpower electric arc and continue luminous between two electrodes.The advantage of HID lamp mainly shows: low-power consumption, high light efficiency and long-life.Compare with Halogen lamp LED, the power consumption of HID lamp has reduced half, and light efficiency has improved 5 times, and the life-span has prolonged nearly 10 times.And the luminous element of HID lamp is little, and reflector can adopt the littler curved design of volume, and focusing power strengthens; The structure of no filament has avoided also under adverse circumstances that light departs from or problem such as inefficacy because of penetrating of causing of filament vibration strength difference.
The great advantage of HID lamp is the fail safe that has increased the automobile nighttime driving, excellent illumination capability provides the at night broader visual field to the driver, and the colour temperature that surpasses 4000K is relatively near the gloss of daylight, also significantly reduced the degree of eye fatigue when running night train, just because of many advantages of HID lamp, in the automobile front illuminator, progressively replaced traditional Halogen lamp LED in recent years, become the mainstream configuration of high-end automobile market, and permeated to the low and middle-end automobile market.
Because the special construction of HID bulb, needing to be equipped with special-purpose electric ballast could reliablely and stablely work.As the core component in the HID illuminator, electric ballast excites xenon ionization luminous starting the high-voltage pulse that moment produces about 20,000 volts, and provides big electric current to keep discharge; In voltage-to-current corresponding relation and the time-controlled requirement of the transition stage that starts to stable state, finish various modes controls such as constant voltage, constant current, change power, permanent power according to HID lamp complexity; Realize permanent power control in stable state; In each working stage monitoring voltage, the isoparametric variation of electric current, realize various faults defencive functions such as overvoltage, short circuit, open circuit simultaneously.
Therefore, the reliably working of HID illuminator depends on the performance quality of electric ballast to a great extent.Traditional ballast adopts analog form control, and control chip adopts ST3843, UCC3305 etc., can only realize simple the startup and defencive function, exists shortcomings such as circuit complexity, volume are big, timing controlled weak effect; Replaced by digital control approach gradually at present; Digital Control is a core with MCU, DSP; can accurately satisfy sequencing control requirement complicated in the HID lamp start-up course; the hot and cold lamp operating state of correct differentiation; realize the various faults defencive function, guarantee the high-luminous-efficiency and the long-life of bulb.From the nineties in last century the invention HID of company lamp such as Philip, Ou Silang so far, the HID lamp electronic ballast has experienced three generations's development course: the first generation mainly is an analog control mode, builds the realization controlled function by discrete device; The second generation adopts MCU, DSP etc. to constitute core control circuit, has realized the Digital Control function; The third generation is representative with German Hai La company, has begun to develop integrated the special chip (ASIC) of core control circuit, has further improved the functional reliability of ballast.
Traditional analog control mode can not realize reliably that lamp starts and steady state operation; exist shortcomings such as hardware circuit complexity, control timing inaccuracy, cold and hot lamp state can't be judged, failure protection function is simple, progressively replaced at present by digital control approach.
Therefore be badly in need of a kind of can smooth transition after can both reliably starting the HID lamp under the cold and hot state fast, starting the HID lamp to stable state and high electric ballast and the control method of the reliability of frequently lighting a lamp.
Summary of the invention
In view of this, in order to address the above problem, the present invention propose a kind of can smooth transition after can both reliably starting the HID lamp under the cold and hot state fast, starting the HID lamp to stable state and high electric ballast and the control method of the reliability of frequently lighting a lamp; This electric ballast and control method thereof can also adapt to different lamp conditions.
One of purpose of the present invention is to propose a kind of HID lamp electronic ballast multi-mode control method; Two of purpose of the present invention is the HID lamp electronic ballasts that propose a kind of multi-mode control.
One of purpose of the present invention is achieved through the following technical solutions:
HID lamp electronic ballast multi-mode control method provided by the invention may further comprise the steps:
S1: initialization, the running parameter of setting and storage HID lamp;
S2: gather the voltage of HID lamp in real time, be input in the Voltage Feedback control circuit;
S3: described Voltage Feedback control circuit compares HID modulating voltage real-time sampling signal and reference voltage, and control is in the output voltage of the HID lamp ballast of open-circuit condition;
S4: gather the electric current of HID lamp in real time, be input in the Current Feedback Control circuit;
S5: described Current Feedback Control circuit compares input of HID lamp current real-time sampling signal and reference current, and control is in the output current of the HID lamp ballast of warm-up phase;
S6:, make comparisons the power output of control HID lamp ballast according to HID modulating voltage and electric current and calculate transient power with the performance number of setting.
Further, specifically comprise the steps: among the described step S3
S31: HID modulating voltage real-time sampling signal and reference voltage are compared, produce error voltage signal;
S32: error voltage signal is handled the formation reference voltage signal through signal circuit;
S33: the constant frequency triangular wave in described reference voltage signal and the PWM controller compares, and produces pulse width modulated wave;
S34: described pulse width modulated wave is used for controlling the output current of electric ballast.
Further, specifically comprise the steps: among the described step S5
S51: HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal;
S52: described reference current signal and electric current real-time sampling signal relatively produce the error current signal;
S53: described error current signal is input to the PWM controller and produces the PWM modulating wave;
S54: described PWM modulating wave is used for controlling the output current of electric ballast.
Further, specifically comprise the steps: among the described step S6
S61: whether the power output that detects ballast reaches default high steady state power value, if testing result is for denying the voltage of rising HID lamp;
S62: if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S63: whether the power output that detects ballast reaches default low steady state power value, if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S64:, be default low steady state power value up to power output if testing result is then adjusted the electric current of output for not.
Further, further comprising the steps of:
S7: detect overvoltage, short circuit, the open-circuit condition of HID lamp, if testing result is not, then keeping power output is default low steady state power value;
S8: if testing result is for being to close the output of HID lamp electronic ballast.
Two of purpose of the present invention is achieved through the following technical solutions:
The HID lamp electronic ballast of multi-mode control provided by the invention, comprise high frequency DC/DC transducer, the DC/AC inverter, high-tension ignition circuit and control circuit, described control circuit comprises signal processing circuit and MCU element circuit, described high frequency DC/DC converter output end is connected with being input to the input of high-tension ignition circuit of DC/AC inverter, the output of the output of described DC/AC inverter and high-tension ignition circuit is connected with the HID lamp respectively, the current/voltage of described HID lamp is input in the signal processing circuit respectively, from the output of signal processing circuit processing signals is input to the MCU element circuit and analyzes, control high frequency DC/DC transducer and DC/AC inverter by the MCU element circuit then.
Further, described MCU unit comprises voltage close loop control module, current closed-loop control module and power closed-loop control module;
Described voltage close loop control module, the output voltage of the ballast when being used to control the HID lamp and being in open-circuit condition, to compare with reference voltage behind the voltage signal sampling of HID lamp, produce error voltage signal, after affiliated error voltage signal is handled through amplifying circuit, compare with the constant frequency triangular wave in the PWM controller, produce pulse width modulated wave, described pulse width modulated wave is used for controlling the output current of electric ballast;
Described current closed-loop control module is used to control the output current of HID lamp warm-up phase, and HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal; Described error current signal is input to the PWM controller and produces the PWM modulating wave; Described PWM modulating wave is used for controlling the output current of electric ballast;
Described power closed-loop control module is used to control the power output of HID lamp, comprises permanent power closed-loop control module and becomes power closed-loop control module; Described permanent power closed-loop control module is used for when the power output that detects ballast during less than default high steady state power value the voltage of rising HID lamp; Described change power closed-loop control module is used for when the power output that detects ballast reaches default high steady state power value, and the power output that then keeps ballast is the Preset Time value;
Further, also comprise PWM controller and PID controller, described PID controller input receives HID lamp feedback signal, and described PID controller output end is connected with the input of PWM controller, and the output of described PWM controller is connected with the input of high frequency DC/DC transducer.
The invention has the advantages that: this aspect utilizes HID lamp starting characteristic; electric current and voltage corresponding relation according to HID lamp different working stage in start-up course; corresponding to the different control model of HID lamp different operating stage selection; accurately control the different operating stage in the HID lamp start-up course; the control of employing Voltage Feedback; Current Feedback Control and change power control various control pattern; electric ballast that the present invention adopts and control method thereof do not need the change on the hardware; just can realize the HID lamp start fast reliably and start behind the HID lamp can smooth transition to steady operation; the reliability of frequently lighting a lamp height; control timing accurately and adapt to different lamp conditions; also have failure protection function simultaneously, prolonged the useful life of HID lamp.
Other advantage of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.The objectives and other advantages of the present invention can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the ballast circuit structured flowchart;
Fig. 2 is a HID lamp volt-ampere characteristic;
Fig. 3 is voltage close loop control block diagram;
Fig. 4 is current closed-loop control block diagram;
Fig. 5 is a power closed-loop control block diagram;
Fig. 6 is HID lamp multi-mode control sequence figure;
Fig. 7 is the control program flow chart.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
Fig. 1 is the ballast circuit structured flowchart; As shown in the figure: the HID lamp electronic ballast of multi-mode control provided by the invention, comprise high frequency DC/DC transducer 101, DC/AC inverter 102, high-tension ignition circuit 107 and control circuit 103, described control circuit 103 comprises signal processing circuit 108 and MCU element circuit 109, described high frequency DC/DC transducer 101 outputs are connected with being input to the input of high-tension ignition circuit 107 of DC/AC inverter 102, the output of the output of described DC/AC inverter 102 and high-tension ignition circuit 107 is connected with HID lamp 104 respectively, the current/voltage of described HID lamp 104 is input to respectively in the signal processing circuit 108, from the output of signal processing circuit 108 processing signals is input to the MCU element circuit 109 and analyzes, control high frequency DC/DC transducer 101 and DC/AC inverter 102 by MCU element circuit 109 then.The MCU element circuit adopts the MCU of Freescale company, also can adopt other single-chip microcomputer or dsp device.
Circuit structure to electric ballast carries out brief analysis below:
The control circuit of electric ballast to parameter samplings such as input voltage, input current, output voltage, output currents after, carry out the COMPREHENSIVE CALCULATING analysis according to control strategies such as the constant current in different operating stage, permanent power, change power, the output reference level is to the PWM power management chip, control PWM conducting duty ratio is to regulate output voltage and power output.
The DC/DC circuit topology adopts the single-ended reverse exciting structure, can reduce number of elements, reduces the module volume, improves the reliability of system works.The DC input range is 9 ~ 16V, and high-frequency converter output produces the dc voltage of 75 ~ 90V and gives the power supply of HID lamp.Ballast output can be considered open circuit before the lamp igniting, and the output voltage of converter rises to about 400V through voltage doubling rectifing circuit, is input to the high-tension ignition circuit, to produce the high tension ignition pulse about 20kV.
The whole switch periods of power supply primary switch is T, and behind ON time Ton, the electric current among the primary inductance Lp rises to maximum Ip, and the input power P that busbar voltage Vdc provides in the monocycle is:
Because
, then have:
As seen, for certain input voltage and switch periods, the duty ratio of primary switch conducting is depended in the adjustment of power output; If feedback control loop keeps V
DcT
OnConstant, then power output remains unchanged.
In order to prolong the life-span of HID lamp tube electrode, the square wave drive voltage ratio is more satisfactory, and square wave current can make lamp current crest coefficient approach 1, in the time of can preventing current over-zero arc light light a fire again and occur the flicker.The selection of square wave operating frequency is important, because can produce the problem of acoustic resonance during high-frequency work, and causes the instability of arc light, the variation even the blow-out of colour temperature.The operating frequency of this paper model machine is decided to be the hundreds of hertz, and the HID lamp is operated in low-frequency square-wave like this, has avoided the frequency band of acoustic resonance.The Primary Component of DC/AC circuit has been selected the full bridge driver of SAKEN company for use, and it is integrated required high voltage control IC and the power MOS pipe of full bridge inverter saved area than the circuit that traditional discrete device is formed, and also increased the reliability of circuit.
Fig. 2 is a HID lamp volt-ampere characteristic; Below the starting characteristic of HID lamp is analyzed:
Be filled with xenon and a spot of metal halide in the fluorescent tube of HID, must add during startup that high-voltage pulse makes gas ionization discharge.After gas is lighted, at first be operated in low-tension arc light discharge state, this moment, modulating voltage was low, and about about 20V, the luminous flux of output is little, and metal halide at high temperature is decomposed into metallic atom and halogen atom, by the electric field stimulated luminescence; Along with improving constantly of temperature, metal halide all evaporates, and particle participates in luminous successively, the luminous flux of output is stable gradually, and the lamp internal gas pressure can reach tens atmospheric pressure, and electric arc transfers the high-tension arc light discharge to, modulating voltage rises to nearly 100V by 20V, enters the steady operation stage.
The HID lamp is the critical stage of its work from the transition that starts to stable state, the electric ballast that performance is high guarantees that the HID lamp carries out the transition to stable state reposefully, reach 80% of normal light output in the luminous flux 2s, no light jitter phenomenon, frequent open-and-shut action can not influence its life-span; The electric ballast of poor performance can't guarantee that transition is steady, and the light shake is serious, and the variation naked eyes sensation of luminous flux is obvious, and long-term open-and-shut action can make fluorescent tube aging in advance, significantly reduces its useful life.
The startup of HID lamp punctures and generally includes high-voltage breakdown, glow discharge, aura transition and the arc discharge plurality of processes to arc light, and the condition that supporting with it electric ballast need satisfy has: can provide to puncture required high voltage pulse, start the enough big power of moment output to keep discharge, to control etc. the sequential of start-up course is accurate.The design performance of electric ballast has directly determined the reliability and the long term life of HID illuminator.
The start-up course of HID lamp can be divided into five stages: Turn-on stage(conducting phase), Ignition stage(ignition phase), Warm-up stage(warm-up phase), Run-up stage(ascent stage) and the Steady stage(stabilization sub stage), the HID lamp is as the load of ballast in the whole starting process, present negative resistance charactertistic, and the equiva lent impedance real-time change.
The Turn-on stage: before HID lamp igniting punctured, lamp load was equivalent to open circuit, and ballast need provide the open circuit voltage of several hectovolts to be applied between the lamp tube electrode, producing the high-voltage pulse about 20kV by the high-tension ignition circuit, and guaranteed puncture effectively.
The Ignition stage: start if the HID lamp is cold lamp, promptly open first, then need the high voltage startup pulse about 20kV, the words of warm start only need several kV, through starting impulse once or excitation several times, the xenon of HID lamp just is ionized puncture, produces electrical discharge arc.
The Warm-up stage: the electric arc peace-keeping after the HID lamp igniting discharge surely carries out the transition to the difficult problem that the next stage is a complexity.This moment, the lamp impedance dropped sharply to several ohm, was similar to short-circuit condition, and ballast will provide the electric current of tens A to come the pilot arc discharge, will increase extra startup accumulator in circuit design for this reason; After the arc discharge, the control strategy of lamp is depended on the temperature of lamp, warm start can directly enter the run-up stage, and cold start-up just enters next stage after then needing current preheating about 2.5A.It is very short that high-voltage pulse igniting punctures the time (ms level) of (us level) and preheating, so the operating frequency and the reaction time of control circuit has all been proposed harsh requirement.
The Run-up stage: after the lamp preheating, in order to satisfy the needs that output light flux is climbed to rated value, ballast can be exported the power about 75W, is decided by maximum current and maximum power that lamp tube electrode can bear.Modulating voltage slowly rises to stable state 90V, and lamp current drops to stable state 0.4A, and output work takes the lead in maintaining 75W, drops to stable state 35W then gradually, and whole process duration has tens seconds.Output voltage is the square wave form of positive and negative symmetry, and fluorescent tube two electrodes are powered up evenly, prevents that electrode is aging in advance; The selection of square wave frequency relates to the acoustic resonance effect, is set in usually about the hundreds of hertz.
The Steady-state stage: cold start-up entered stable state after tens seconds, and steady-state output power is controlled at about 35W, and the too high meeting of power causes bulb life to shorten, damage in advance, power cross lowly cause the easy blow-out of lamp again, output light flux is on the low side.
Fig. 6 is HID lamp multi-mode control sequence figure, and the start-up course of HID lamp can be divided into 4 Main Stage in order, adopts different control models at different working stages, and the duration in each stage also can be controlled accurately.
As the further improvement of the foregoing description, described MCU unit comprises voltage close loop control module, current closed-loop control module and power closed-loop control module;
Fig. 3 is voltage close loop control block diagram; As shown in the figure, described voltage close loop control module, the output voltage of the ballast when being used to control the HID lamp and being in open-circuit condition, to compare with reference voltage behind the voltage signal sampling of HID lamp, produce error voltage signal, after affiliated error voltage signal is handled through amplifying circuit, compare with constant frequency triangular wave in the PWM controller, produce pulse width modulated wave, described pulse width modulated wave is used for controlling the output current of electric ballast;
Fig. 4 is voltage close loop control block diagram; As shown in the figure, described current closed-loop control module is used to control the output current of HID lamp warm-up phase, and HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal; Described error current signal is input to the PWM controller and produces the PWM modulating wave; Described PWM modulating wave is used for controlling the output current of electric ballast;
Fig. 5 is a power closed-loop control block diagram; As shown in the figure, described power closed-loop control module is used to control the power output of HID lamp, comprises permanent power closed-loop control module and becomes power closed-loop control module; Described permanent power closed-loop control module is used for when the power output that detects ballast during less than default high steady state power value the voltage of rising HID lamp; Described change power closed-loop control module is used for when the power output that detects ballast reaches default high steady state power value, and the power output that then keeps ballast is the Preset Time value.
Further improvement as the foregoing description, also comprise PWM controller and PID controller, described PID controller input receives HID lamp feedback signal, described PID controller output end is connected with the input of PWM controller, and the output of described PWM controller is connected with the input of high frequency DC/DC transducer.
Fig. 7 is the control program flow chart, and as shown in the figure: HID lamp electronic ballast multi-mode control method provided by the invention may further comprise the steps:
S1: initialization, the running parameter of setting and storage HID lamp; Be provided with and store reference voltage, reference current, setting power value, the default high steady state power value of HID lamp;
S2: gather the voltage of HID lamp in real time, be input in the Voltage Feedback control circuit;
S3: described Voltage Feedback control circuit compares HID modulating voltage real-time sampling signal and reference voltage, and control is in the output voltage of the HID lamp ballast of open-circuit condition;
S4: gather the electric current of HID lamp in real time, be input in the Current Feedback Control circuit;
S5: described Current Feedback Control circuit compares input of HID lamp current real-time sampling signal and reference current, and control is in the output current of the HID lamp ballast of warm-up phase;
S6:, make comparisons the power output of control HID lamp ballast according to HID modulating voltage and electric current and calculate transient power with the performance number of setting.
As the further improvement of the foregoing description, described step S3 is mainly used in the stage at Turn-on, and the HID lamp is in open-circuit condition, ballast no-load running, and output 400V voltage, control model is the Voltage Feedback closed-loop control.Lamp voltage signal sampling back relatively produces error signal with reference voltage, after amplifying circuit is handled, compare with constant frequency triangular wave in the PWM controller, produce pulse width modulated wave, the control loop block diagram is seen Fig. 4, and controlled function is finished by PWM power management chip and signal processing amplifying circuit.
Described step S3 specifically comprises the steps:
S31: HID modulating voltage real-time sampling signal and reference voltage are compared, produce error voltage signal;
S32: error voltage signal is handled the formation reference voltage signal through signal circuit;
S33: the constant frequency triangular wave in described reference voltage signal and the PWM controller compares, and produces pulse width modulated wave;
S34: described pulse width modulated wave is used for controlling the output current of electric ballast.
Further improvement as the foregoing description, main task is preheating (Warm-up) the stage stable discharging electric arc at the HID lamp among the described step S5, because after wearing moment, electric arc is just set up, be easy to needs special accumulator to provide the electric currents of tens peaces to keep discharge because electricity shortage etc. is former thereby extinguish for this reason.Big electric current continues promptly to drop to about 2.5A after the very short time, and with positive and negative two half-wave forms output, the lamp electrode is heated evenly, and avoids it excessively to burn.This stage control model is the current feedback closed-loop control, and the control loop block diagram is seen Fig. 5, and the MCU control circuit is realized the control core function.
Described step S5 specifically comprises the steps:
S51: HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal;
S52: described reference current signal and electric current real-time sampling signal relatively produce the error current signal;
S53: described error current signal is input to the PWM controller and produces the PWM modulating wave;
S54: described PWM modulating wave is used for controlling the output current of electric ballast.
Further improvement as the foregoing description, the Run-up stage power output that is mainly used among the described step S6 at the HID lamp at first maintains about 75W, after rising to certain value, progressively reduces modulating voltage power output again to stable state 35W(Steady-state), corresponding permanent power closed loop of difference and change power closed loop control mode, the control loop block diagram is seen Fig. 6.Analog signal such as modulating voltage, electric current inputs to the MCU control circuit, calculate transient power, make comparisons, adjust the reference current signal of output according to its difference size with the setting power value, reach the purpose of indirect adjustment power output, thereby finish the power closed-loop control.
Described step S6 specifically comprises the steps:
S61: whether the power output that detects ballast reaches default high steady state power value, if testing result is for denying the voltage of rising HID lamp;
S62: if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S63: whether the power output that detects ballast reaches default low steady state power value, if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S64:, be default low steady state power value up to power output if testing result is then adjusted the electric current of output for not.
As the further improvement of the foregoing description, further comprising the steps of:
S7: detect overvoltage, short circuit, the open-circuit condition of HID lamp, if testing result is not, then keeping power output is default low steady state power value;
S8: if testing result is for being to close the output of HID lamp electronic ballast.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. HID lamp electronic ballast multi-mode control method is characterized in that: may further comprise the steps:
S1: initialization, the running parameter of setting and storage HID lamp;
S2: gather the voltage of HID lamp in real time, be input in the Voltage Feedback control circuit;
S3: described Voltage Feedback control circuit compares HID modulating voltage real-time sampling signal and reference voltage, and control is in the output voltage of the HID lamp ballast of open-circuit condition;
S4: gather the electric current of HID lamp in real time, be input in the Current Feedback Control circuit;
S5: described Current Feedback Control circuit compares input of HID lamp current real-time sampling signal and reference current, and control is in the output current of the HID lamp ballast of warm-up phase;
S6:, make comparisons the power output of control HID lamp ballast according to HID modulating voltage and electric current and calculate transient power with the performance number of setting.
2. HID lamp electronic ballast multi-mode control method according to claim 1 is characterized in that: specifically comprise the steps: among the described step S3
S31: HID modulating voltage real-time sampling signal and reference voltage are compared, produce error voltage signal;
S32: error voltage signal is handled the formation reference voltage signal through signal circuit;
S33: the constant frequency triangular wave in described reference voltage signal and the PWM controller compares, and produces pulse width modulated wave;
S34: described pulse width modulated wave is used for controlling the output current of electric ballast.
3. HID lamp electronic ballast multi-mode control method according to claim 1 is characterized in that: specifically comprise the steps: among the described step S5
S51: HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal;
S52: described reference current signal and electric current real-time sampling signal relatively produce the error current signal;
S53: described error current signal is input to the PWM controller and produces the PWM modulating wave;
S54: described PWM modulating wave is used for controlling the output current of electric ballast.
4. HID lamp electronic ballast multi-mode control method according to claim 1 is characterized in that: specifically comprise the steps: among the described step S6
S61: whether the power output that detects ballast reaches default high steady state power value, if testing result is for denying the voltage of rising HID lamp;
S62: if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S63: whether the power output that detects ballast reaches default low steady state power value, if testing result is for being that the power output that then keeps ballast is the Preset Time value;
S64:, be default low steady state power value up to power output if testing result is then adjusted the electric current of output for not.
5. HID lamp electronic ballast multi-mode control method according to claim 1 is characterized in that: further comprising the steps of:
S7: detect overvoltage, short circuit, the open-circuit condition of HID lamp, if testing result is not, then keeping power output is default low steady state power value;
S8: if testing result is for being to close the output of HID lamp electronic ballast.
6. the HID lamp electronic ballast of multi-mode control, it is characterized in that: comprise high frequency DC/DC transducer (101), DC/AC inverter (102), high-tension ignition circuit (107) and control circuit (103), described control circuit (103) comprises signal processing circuit (108) and MCU element circuit (109), described high frequency DC/DC transducer (101) output is connected with being input to the input of high-tension ignition circuit (107) of DC/AC inverter (102), the output of the output of described DC/AC inverter (102) and high-tension ignition circuit (107) is connected with HID lamp (104) respectively, the current/voltage of described HID lamp (104) is input to respectively in the signal processing circuit (108), from the output of signal processing circuit (108) processing signals is input to the MCU element circuit (109) and analyzes, control high frequency DC/DC transducer (101) and DC/AC inverter (102) by MCU element circuit (109) then.
7. the HID lamp electronic ballast of multi-mode control according to claim 1, it is characterized in that: described MCU unit comprises voltage close loop control module, current closed-loop control module and power closed-loop control module;
Described voltage close loop control module, the output voltage of the ballast when being used to control the HID lamp and being in open-circuit condition, to compare with reference voltage behind the voltage signal sampling of HID lamp, produce error voltage signal, after affiliated error voltage signal is handled through amplifying circuit, compare with the constant frequency triangular wave in the PWM controller, produce pulse width modulated wave, described pulse width modulated wave is used for controlling the output current of electric ballast;
Described current closed-loop control module is used to control the output current of HID lamp warm-up phase, and HID lamp current real-time sampling signal is input to MCU control circuit output reference current signal, produces the error current signal; Described error current signal is input to the PWM controller and produces the PWM modulating wave; Described PWM modulating wave is used for controlling the output current of electric ballast;
Described power closed-loop control module is used to control the power output of HID lamp, comprises permanent power closed-loop control module and becomes power closed-loop control module; Described permanent power closed-loop control module is used for when the power output that detects ballast during less than default high steady state power value the voltage of rising HID lamp; Described change power closed-loop control module is used for when the power output that detects ballast reaches default high steady state power value, and the power output that then keeps ballast is the Preset Time value.
8. the HID lamp electronic ballast of multi-mode control according to claim 1, it is characterized in that: also comprise PWM controller and PID controller, described PID controller input receives HID lamp feedback signal, described PID controller output end is connected with the input of PWM controller, and the output of described PWM controller is connected with the input of high frequency DC/DC transducer.
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| CN2011100880421A CN102123555A (en) | 2011-04-08 | 2011-04-08 | HID (High Intensity Discharge) lamp electronic ballast and multimode control method thereof |
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| CN2011100880421A CN102123555A (en) | 2011-04-08 | 2011-04-08 | HID (High Intensity Discharge) lamp electronic ballast and multimode control method thereof |
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