CN102271450B - Novel control circuit for electronic ballast of HID lamp - Google Patents
Novel control circuit for electronic ballast of HID lamp Download PDFInfo
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- CN102271450B CN102271450B CN201010191778.7A CN201010191778A CN102271450B CN 102271450 B CN102271450 B CN 102271450B CN 201010191778 A CN201010191778 A CN 201010191778A CN 102271450 B CN102271450 B CN 102271450B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses a novel control circuit for an electronic ballast of an HID lamp. A main body of the control circuit provided in the invention comprises: a high frequency starting signal generating circuit, a low frequency modulation signal generating circuit, a power closed loop signal generating circuit, a control signal integration circuit and a voltage frequency transformation circuit. According to the invention, the HID lamp functions including sliding frequency starting, low frequency modulation, continuous frequency power closed loop and continuous frequency conversion light modulation and the like are realized; besides, the circuit provided in the invention has a simple structure and a control demand of the HID lamp can be met comprehensively.
Description
Technical field
The present invention relates to a kind of new type control circuit that is applicable to electronic ballast of high intensity gas discharge lamp, the functions such as sliding startup frequently, low frequency modulations, continuous frequency conversion power closed loop and continuous frequency conversion light modulation on a large scale that especially can realize high-intensity gas discharge lamp can be for high-pressure sodium lamp and metal halide lamp.
Background technology
High intensity discharge (HID) light fixture has the plurality of advantages such as light efficiency is high, the life-span is long, power bracket is wide, becomes the third generation electric light source after incandescent lamp, fluorescent lamp.HID lamp is widely used in the indoor and outdoor lighting environment such as square, harbour, workshop, road, in current illuminator, occupies an important position.
High-intensity gas discharge lamp has negative resistance character, and need to join ballast could normal work.Electric ballast has more and more replaced traditional Inductive ballast, and it has, and efficiency is high, volume is little, control is flexible, defencive function is perfect, to prolong the life of lamps, power factor are high, to advantages such as electric network pollution are little.
The inlet wire AC power of high-frequency electronic ballast is by EMI circuit and rectification and circuit of power factor correction, for high-frequency inverter circuit provides stable high-voltage DC power supply.High-frequency inverter circuit generally adopts load resonant inverter.The high-frequency ac power of its output drives high-intensity gas discharge lamp by passive load matching network.Control circuit detects the operating state of discharge lamp, sends the driving signal of inverter.Drive signal by drive circuit, to control the power switch of high-frequency inverter circuit.
When high-intensity gas discharge lamp starts, must apply the electrode that high-voltage pulse electric is pressed on lamp two ends.The amplitude of required plus high-pressure pulse and width are relevant with the factor such as size, interelectrode distance length that is filled with gas pressure in lamp.For the reliable high-intensity gas discharge lamp that starts, can adopt the sliding method frequently starting.
In the process of HID lamp burning-point, working point can be moved, and modulating voltage raises.Due to the difference of manufacturing process and parameter, the parameter of same model lamp and characteristic also have very large difference.If lamp power surpasses rated power, the lamp life-span can shorten greatly.This requires electric ballast must have the closed-loop control of lamp power.To high-frequency electronic ballast, can realize the closed-loop control of lamp power by changing the operating frequency of inverter.In addition, energy-saving and cost-reducing in order further to realize, in some occasions, need to carry out brightness adjustment control to high-intensity gas discharge lamp, this requires the frequency range of electric ballast very large.
High-intensity gas discharge lamp has significantly " acoustic resonance " phenomenon.To high-frequency electronic ballast, a kind of method of effective inhibition acoustic resonance phenomenon is to add low-frequency modulation signal in high-frequency drive waveform, and the frequency of low-frequency modulation signal is relevant with modulation characteristic with amplitude.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of new type control circuit of electronic ballast of high intensity gas discharge lamp, is the main body of electronic ballast control circuit.
For solving the problems of the technologies described above the main body of control circuit of the present invention, by high frequency enabling signal circuit for generating A, low-frequency modulation signal circuit for generating B, power closed signal circuit for generating C, control signal synthetic circuit D and voltage to frequency conversion circuit E etc., formed.The input signal IN1 to IN6 of this circuit is occurred by microprocessor (MCU), and output signal OUT5 removes drive circuit.
The input signal IN1 of high frequency enabling signal circuit for generating A is from MCU.IN1 is that frequency is fixed, the pwm signal of variable duty ratio.Output OUT1 be amplitude with IN1 change in duty cycle the direct current signal of linear change, the excursion of signal OUT1 must meet the startup requirement of HID lamp.The excursion of OUT1 is determined by the characteristic of laod network parameter and HID lamp.
The input signal IN3 of low-frequency modulation signal circuit for generating B is from MCU.IN3 is that changeable frequency duty ratio is 50% square-wave signal.In lamp start-up course, the frequency of IN3 is higher, output OUT3 be ripple very small magnitude approach half r direct current signal of IN3 amplitude, being equivalent to does not have low frequency modulations.After lamp starts, the frequency of IN3 reduces, and output OUT3 is low frequency triangular wave, and mean value approaches half of IN3 amplitude, realizes low frequency modulations.The parameter designing of circuit B and the Frequency of IN3 are definite by parameter and the characteristic of lamp, and definite principle is that lamp does not have " acoustic resonance " phenomenon.
The input signal IN2 of power closed signal circuit for generating C is from MCU.IN2 is the variable pwm signal of frequency fixed duty cycle.Output OUT2 is the direct current signal of amplitude linear change with the change in duty cycle of IN2, and the excursion of signal OUT2 can meet the power closed-loop control requirement of HID lamp.The excursion of OUT2 is determined by the power of laod network parameter and HID lamp.
Input signal OUT1, the OUT2 of control signal synthetic circuit D and OUT3 are that input signal IN4, the IN5 of D and IN6 are the logical signals from MCU through signal IN1, IN2 and the IN3 of the MCU of A, B, C processing.IN4, IN5 and IN6 are that high level " 1 " is effective, are made as the input of MCU when invalid, are equivalent to " high resistant " suspended state.Combination by IN4, IN5 and IN6 effective status can expand and the level excursion of definite OUT4, finally determines the switching frequency excursion of inverter circuit.This frequency range must meet the requirement of lamp power closed loop and light modulation on a large scale.In addition, by the matching design of circuit D parameter and the combination effective status of IN4, IN5 and IN6, the level that can guarantee OUT4 when the duty ratio from 0% to 100% of IN2 changes back and forth meets continuous monotone variation substantially, simplifies the design that MCU controls software, and this is also the unique distinction of this circuit.Input signal IN4, the IN5 of D and IN6 can adopt one or more, and it or they effect is the resolution that improves MCU output pwm signal IN2.Input signal IN4, the IN5 of D and IN6 can adopt the mode of adder to carry out comprehensively, also can adopt the mode of switched resistor network to carry out comprehensively.
The input signal of voltage to frequency conversion circuit E is from the output signal OUT4 of D, and the output signal OUT5 of E removes the drive circuit of Fig. 1.The effect of circuit E is exactly that direct current signal OUT4 is transformed to duty ratio is 50% high-frequency square-wave signal OUT5.The frequency of OUT5 and the amplitude of OUT4 are linear.
When the sliding frequency of lamp starts, IN2 is maximum duty cycle 100%, corresponds to high level; The frequency of IN3 is higher, output OUT3 be ripple very small magnitude approach half direct current signal of IN3 amplitude; IN4, IN5 and IN6 are set to invalid suspended state; IN1 duty ratio is from greatly to little variation, and the frequency of OUT5 changes from high to low.Control can realize the level and smooth sliding high voltage startup frequently of lamp like this.
After lamp starts, IN1 duty ratio is minimum 0%, corresponds to low level; The frequency of IN3 reduces, and output OUT3 is low frequency triangular wave, realizes low frequency modulations; The duty ratio of IN2 changes continuously, coordinates with the effective status of IN4, IN5 and IN6.Control can realize the functions such as low frequency modulations, continuous frequency conversion power closed loop and continuous frequency conversion light modulation on a large scale like this.
Adopt after such structure, can realize the functions such as sliding startup frequently, low frequency modulations, continuous frequency conversion power closed loop and continuous frequency conversion light modulation on a large scale of high-intensity gas discharge lamp, circuit structure is simple, can meet the control requirement of high-intensity gas discharge lamp comprehensively.MCU is by detecting the operating state of lamp and ballast, can also realize lamp open circuit, lamp short circuit, thermolamp state, input the defencive functions such as superpressure, input undervoltage and ballast be overheated.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The present invention is that the control circuit shown in Fig. 1 is as the main body of high-frequency electronic ballast.
Fig. 2 is that the control circuit of high-frequency electronic ballast main body forms.
Fig. 3 is the first execution mode high frequency enabling signal circuit for generating of the present invention.
Fig. 4 is the second execution mode low-frequency modulation signal circuit for generating of the present invention.
Fig. 5 is the third execution mode power closed signal circuit for generating of the present invention.
Fig. 6 is the 4th kind of execution mode control signal synthetic circuit of the present invention.
Fig. 7 is the 5th kind of execution mode voltage to frequency conversion circuit of the present invention.
Embodiment
A realizes circuit as shown in Figure 3.Circuit element consists of resistance R 1 (10k Ω), R2 (100k Ω), R3 (300k Ω), R4 (100k Ω), capacitor C 1 (1 μ F) and integrated operational amplifier U1A.U1A can adopt LM2904 or other integrated operational amplifier.A termination input signal IN1 of R1, the positive input terminal of another termination R2, C1 and U1A.R2 one end ground connection, the positive input terminal of another termination R1, C1 and U1A.C1 one end ground connection, the positive input terminal of another termination R1, R2 and U1A.R3 one end ground connection, the negative input end of another termination R4 and U1A.The output of R4 mono-termination U1A, the negative input end of another termination R3 and U1A.The power positive end of U1A connects DC power supply VCC (+12V), power supply negative terminal ground connection.Output OUT1 meets output and the R4 of U1A.The amplitude of input signal IN1 is 5V, and frequency is 10kHz.
B realizes circuit as shown in Figure 4.Circuit element consists of resistance R 7 (20k Ω), R8 (20k Ω), R9 (20k Ω), R10 (100k Ω), R11 (100k Ω), capacitor C 3 (0.1 μ F) and integrated operational amplifier U2A.U2A can adopt LM2904 or other integrated operational amplifier.R7 mono-termination power VCC, another termination R8, R9.R8 one end ground connection, another termination R7, R9.The positive input terminal of R9 mono-termination U2A, another termination R7, R8.R10 mono-termination input signal IN3, the negative input end of another termination R11, C3 and U2A.The negative input end of R11 mono-termination R10, C3 and U2A, the output of another termination C3 and U2A.The negative input end of C3 mono-termination R10, R11 and U2A, the output of another termination R11 and U2A.The power positive end of U2A meets DC power supply VCC, power supply negative terminal ground connection.Output OUT3 meets output, R11 and the C3 of U2A.The amplitude of IN3 is 5V, and in lamp start-up course, the frequency of IN3 is 1kHz.After lamp is lighted, the frequency of IN3 is reduced to 100Hz.
C realizes circuit as shown in Figure 5.Circuit element consists of resistance R 5 (10k Ω), R6 (100k Ω), capacitor C 2 (1 μ F) and integrated operational amplifier U1B.U1B can adopt LM2904 or other integrated operational amplifier.R5 mono-termination input signal IN2, the positive input terminal of another termination R6, C2 and U1B.R6 one end ground connection, the positive input terminal of another termination R5, C2 and U1B.C2 one end ground connection, the positive input terminal of another termination R5, R6 and U1B.U1B is connected into emitter follower circuit, and its negative input end, output and output signal OUT2 are connected.The amplitude of input signal IN2 is 5V, and frequency is 10kHz.
D realizes circuit as shown in Figure 6.Circuit element consists of resistance R 12 (100k Ω), R13 (330k Ω), R14 (330k Ω), R15 (270k Ω), R16 (120k Ω), R17 (75k Ω), R18 (100k Ω), R19 (100k Ω), R20 (10k Ω), capacitor C 4 (0.1 μ F) and integrated operational amplifier U2B.U2B can adopt LM2904 or other integrated operational amplifier.R12 mono-termination signal OUT1, the positive input terminal of another termination R13, R14, R15, R16, R17 and U2B.R13 mono-termination signal OUT2, the positive input terminal of another termination R12, R14, R15, R16, R17 and U2B.R14 mono-termination signal OUT3, the positive input terminal of another termination R12, R13, R15, R16, R17 and U2B.R15 one end fetches the logical signal IN4 from MCU, the positive input terminal of another termination R12, R13, R14, R16, R17 and U2B.R16 one end fetches the logical signal IN5 from MCU, the positive input terminal of another termination R12, R13, R14, R15, R17 and U2B.R17 one end fetches the logical signal IN6 from MCU, the positive input terminal of another termination R12, R13, R14, R15, R16 and U2B.R18 one end ground connection, the negative input end of another termination R19 and U2B.The output of R19 mono-termination R20 and U2B, the negative input end of another termination R18 and U2B.The output of R20 mono-termination R19 and U2B, another termination C4 and output signal OUT4.The high level of IN4, IN5, IN6 output is 5V.
E realizes circuit as shown in Figure 7.Circuit element consists of resistance R 21 (10k Ω), R22 (120k Ω), capacitor C 4 (1nF) and integrated circuit U3.Here U3 can adopt phase-locked loop MC14046B or other integrated circuit.R21 one end ground connection, 11 pin of another termination U3.R22 one end ground connection, 12 pin of another termination U3.6 pin of C4 mono-termination U3,7 pin of another termination U3.Power supply 16 pin of U3 meet VCC, and 14,5 and power supply ground 8 pin ground connection, 4 pin meet output signal OUT5 after being connected with 3 pin, and 9 pin meet signal OUT4,1 pin, 2 pin, 10 pin, 13 pin and 15 unsettled.
When the sliding frequency of lamp starts, IN2 is maximum duty cycle 100%, corresponds to high level; The frequency of IN3 is 1kHz, and output OUT3 is the direct current signal that ripple is very little; IN4, IN5 and IN6 are set to invalid suspended state; IN1 duty ratio is from greatly to little variation, and the frequency of OUT5 changes from high to low, realizes level and smooth sliding startup frequently.
After lamp starts, IN1 duty ratio is minimum 0%, corresponds to low level; The frequency of IN3 is reduced to 100Hz, and output OUT3 is low frequency triangular wave; The duty ratio of IN2 changes continuously, coordinates with the effective status of IN4, IN5 and IN6.
The continuous variation of duty ratio of a kind of IN2 and the effective status fitting method of IN4, IN5 and IN6 are as follows:
1.IN2 duty ratio from 0% to 100%, IN4, IN5 and IN6 all invalid.
2.IN2 duty ratio from 0% to 100%, only has IN4 effective.
3.IN2 duty ratio from 0% to 100%, only has IN5 effective.
4.IN2 duty ratio from 0% to 100%, only has IN6 effective.
5.IN2 duty ratio from 0% to 100%, IN4 and IN6 effective.
6.IN2 duty ratio from 0% to 100%, IN5 and IN6 effective.
7.IN2 duty ratio from 0% to 100%, IN4, IN5 and IN6 all effective.
When requiring output signal OUT5 frequency to raise, the sequential control according to from 1 to 7.When requiring output signal OUT5 frequency to reduce, the sequential control according to from 7 to 1.
Claims (1)
1. the new type control circuit of an electronic ballast of high intensity gas discharge lamp, it is characterized in that, the main body of described new type control circuit comprises high frequency enabling signal circuit for generating (A), low-frequency modulation signal circuit for generating (B), power closed signal circuit for generating (C), control signal synthetic circuit (D) and voltage to frequency conversion circuit (E), the input signal IN1-IN6 of described new type control circuit is occurred by microprocessor (MCU), IN1, IN2 and IN3 are respectively described high frequency enabling signal circuit for generating (A), the input signal of low-frequency modulation signal circuit for generating (B) and power closed signal circuit for generating (C), the output signal OUT1 that it is corresponding, OUT2 and OUT3 and logical signal IN4-IN6 are the input signal of described control signal synthetic circuit (D), the output signal OUT4 of control signal synthetic circuit (D) is the input signal of described voltage to frequency conversion circuit (E), output signal OUT5 by voltage to frequency conversion circuit (E) removes drive circuit, by matching design and the IN4 of control signal synthetic circuit (D) parameter, the combination effective status of IN5 and IN6, when the duty ratio from 0% to 100% of guaranteeing IN2 changes back and forth, the level of OUT4 meets continuous monotone variation, when the sliding frequency of high-intensity gas discharge lamp starts, IN2 is maximum duty cycle 100%, correspond to high level, the frequency of IN3 is 1kHz, output OUT3 is the direct current signal that ripple is very little, IN4, IN5 and IN6 are set to invalid suspended state, IN1 duty ratio is from greatly to little variation, the frequency of OUT5 changes from high to low, realize level and smooth sliding startup frequently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010191778.7A CN102271450B (en) | 2010-06-04 | 2010-06-04 | Novel control circuit for electronic ballast of HID lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010191778.7A CN102271450B (en) | 2010-06-04 | 2010-06-04 | Novel control circuit for electronic ballast of HID lamp |
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| CN102271450A CN102271450A (en) | 2011-12-07 |
| CN102271450B true CN102271450B (en) | 2014-11-12 |
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| CN104822217B (en) * | 2015-05-05 | 2018-07-13 | 浙江开元光电照明科技有限公司 | A kind of electrodeless florescent lamp light-dimming method controlling duty ratio using bifrequency square-wave pulse signal generator |
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Non-Patent Citations (4)
| Title |
|---|
| 姚冬敏.智能数字化大功率金卤灯电子镇流器的研究和设计.《中国优秀硕士学位论文全文数据库》.2007, * |
| 智能数字化大功率金卤灯电子镇流器的研究和设计;姚冬敏;《中国优秀硕士学位论文全文数据库》;20070415;第1章-第5章 * |
| 金属卤化物灯电子镇流器消除声共振的几种方法;鲍志云;《中国照明电器》;20020925;全文 * |
| 鲍志云.金属卤化物灯电子镇流器消除声共振的几种方法.《中国照明电器》.2002, * |
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