CN101304627A - Constant power control method for electric ballast of high-strength air discharge lamp - Google Patents
Constant power control method for electric ballast of high-strength air discharge lamp Download PDFInfo
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- CN101304627A CN101304627A CNA2008100620314A CN200810062031A CN101304627A CN 101304627 A CN101304627 A CN 101304627A CN A2008100620314 A CNA2008100620314 A CN A2008100620314A CN 200810062031 A CN200810062031 A CN 200810062031A CN 101304627 A CN101304627 A CN 101304627A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 method for controlling constant power of an electric ballast of a high strength gas discharger lamp. The main circuit of the ballast comprises a DC-DC converting circuit and a full bridge inverter circuit. A control system comprises a micro-controller and a driver IC. The inner part of the micro-controller attaches an analog-digital converter, the analog-digital converter is used for collecting the voltage signal and the current signal of the main circuit of the ballast, thus obtaining the current power value of a bulb. And incremental algorithm is applied to the PI regulation of the power value. The inner part of the micro-controller attaches a high-speed PWM generator and a triangular signal. The high-speed PWM generator compares a result regulated by PI with the triangular signal to generate a PWM signal. The PWM signal controls the DC-DC converting circuit directly by the driver IC to regulate the output voltage of the circuit, thus performing constant power control. The method collects the current and the voltage of the bulb simultaneously to perform the constant power control, so the constant power control has good timeliness and high accuracy. In addition, the method can ensure that the constant power control can be performed stably in all the states of a lamp.
Description
Technical field
The present invention relates to the control method of the electric ballast of high intensity discharge lamps such as a kind of high-pressure sodium lamp, metal halide lamp, especially, relate to a kind of electric ballast constant-power control method of high-intensity gas discharge lamp.
Background technology
High-intensity gas discharge lamp is owing to its high-luminous-efficiency, long-life have obtained application more and more widely.But the negative resistance charactertistic that high-intensity gas discharge lamp presented makes and can not merely it be inserted electrical network, has only to be used just with ballast to be used for normal lighting.And traditional inductance type ballast volume is big and heavy, and exists some such as serious problems of polluting electrical network, so it will be replaced by another kind of novel ballast, and this ballast is an electric ballast.Electronic ballast need guarantee that lamp is operated in permanent power rating, makes light output stablize and prolong the life-span of lamp.Main cause has following 3 points: one, the operating characteristic of the high-intensity gas discharge lamp of specification of the same race exists very big-difference, the electric ballast of simple constant voltage or constant current control very big power difference may occur when receiving on the different lamps, make its skew rated power, cause the decline in lamp life-span.Its two, high-intensity gas discharge lamp is not to be equivalent to a pure resistance, under constant voltage or constant current control, power also can float at random, makes the life-span that light output is unstable and reduce lamp.Its three, along with the passing of service time, the rated voltage at lamp two ends can be on the rise, traditional constant voltage or constant current control method can make lamp be operated under the non-rated power.Make the life-span that light output is unstable and reduce lamp.
Electric ballast has many advantages, and one of them can be controlled lamp exactly and be operated under the permanent power rating, improves the life-span of lighting quality, prolongation lamp.The constant-power control method of electronic ballast of high intensity gas discharge lamp roughly is divided into two classes: permanent power control is controlled and simulated to digital permanent power.Simulation constant-power control circuit complexity, transplantability are poor, cost height, control precision are relatively low, bigger to the sensitiveness of circuit parameter.And digital constant-power control circuit is simple, cost is low, reliability is high, owing to wherein numerically controlled part arranged, so control precision height, transplantability are good.The permanent power technology of existing numeral generally is to gather lamp current separately to control modulating voltage or gather modulating voltage and control lamp current.Can there be the phenomenon of positive feedback in such control method when the bulb electric current commutates.Control the method for lamp current such as the sampling modulating voltage, electric current can diminish when lamp current commutate, and modulating voltage produces an overshoot owing to commutating.The modulating voltage of gathering this moment rises, thereby the control lamp current reduces, and lamp current reduces to cause bulb energy not keep and the phenomenon of rekindling takes place, and voltage rises again like this, forms a positive feedback and makes the circuit instability.Equally, also can there be this problem in the method for sampling lamp current control modulating voltage.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of electric ballast constant-power control method that is used for high-intensity gas discharge lamp is provided.
The objective of the invention is to be achieved through the following technical solutions: a kind of electric ballast constant-power control method that is used for high-intensity gas discharge lamp, the main circuit of ballast comprises direct current DC transfer circuit and full bridge inverter; Control system comprises microcontroller and chip for driving, and microcontroller has the high speed PWM generator of analog and digital signal transducer.It is characterized in that this method may further comprise the steps:
(1) analog-digital converter that carries of controller inside is gathered the voltage signal current signal on the ballast main circuit, thereby obtains the current power value of bulb;
(2) digital PI regulates: adopt the increment type algorithm that performance number is carried out PI and regulate;
(3) produce the digital PWM signal: microcontroller inside carries the high speed PWM generator and compares with the inner triangular signal that carries according to the result that PI regulates, and produces pwm signal;
(4) pwm signal is directly controlled the direct current DC transfer circuit by chip for driving, regulates its output voltage, thereby reaches permanent power control.
Further, by following equation performance number being carried out PI regulates:
y
k＝y
k-1+(K
p+K
pK
I)e
k-K
pe
k-1，
In the formula: y
kThe k time output valve for pi regulator;
y
K-1The k-1 time output valve for pi regulator;
e
kWhen being the k time sampling, the difference between specified rate and the feedback quantity;
e
K-1When being the k-1 time sampling, the difference between specified rate and the feedback quantity;
K
IBe integral coefficient, Kp is a proportionality coefficient, all manually sets according to concrete control system.
The invention has the beneficial effects as follows that the present invention reaches the control of permanent power by gathering lamp current simultaneously and modulating voltage is regulated, the real-time of permanent power control is good, the precision height, and guaranteeing simultaneously can both stable operation under each state of bulb.
Description of drawings
Fig. 1 is the application circuit structured flowchart of electric ballast constant-power control method of the present invention;
Fig. 2 is the flow chart of electric ballast constant-power control method of the present invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail, it is more obvious that purpose of the present invention and effect will become.
As shown in Figure 1, the control system of electric ballast constant-power control method of the present invention comprises a microcontroller and a chip for driving; Microcontroller has the high speed PWM generator of analog and digital signal transducer.The main circuit of ballast comprises direct current DC transfer circuit and full bridge inverter.The direct voltage Vlamp that the direct current DC transfer circuit is boosted direct voltage to obtain a suitable bulb job, this direct voltage become an alternating voltage through full bridge inverter again and supply with bulb, make its operate as normal.Microcontroller is directly gathered direct voltage and the current signal before the full bridge inverter, carries out multiplication and calculates; The signal multiplication of two direct currents is performance numbers.What calculate like this is the power output of prime direct current DC transfer circuit.The loss of considering full bridge inverter is very little, thinks that this performance number is exactly the performance number of lamp so be similar to.Microcontroller carries out digital PI (proportional integral) adjusting to this power signal then, export PWM (pulse-width modulation) signal of duty ratio corresponding according to the result of PI adjusting, this pwm signal is given to the direct current DC transfer circuit through chip for driving, regulates Vlamp, thereby reaches the purpose of permanent power control.
Fig. 2 shows the flow process that the present invention is used for the electric ballast constant-power control method of high-intensity gas discharge lamp, mainly divides following steps:
1, sample rate current and voltage signal and calculate
Analog-digital converter that microcontroller inside carries is come in voltage signal acquisition earlier, and switching channel is gathered current signal then, the conversion value of these two signals is carried out multiplication calculate, and obtains the current power value of bulb.
2, digital PI regulates
Microcontroller sampling increment type algorithm carries out PI control to performance number, and equation is as follows:
y
k＝y
k-1+(K
p+K
pK
I)e
k-K
pe
k-1
In the formula: y
kThe k time output valve for pi regulator;
y
K-1The k-1 time output valve for pi regulator;
e
kWhen being the k time sampling, the difference between specified rate and the feedback quantity;
e
K-1When being the k-1 time sampling, the difference between specified rate and the feedback quantity;
K
IBe integral coefficient, Kp is a proportionality coefficient, all manually sets according to concrete control system.
3, produce the digital PWM signal
Microcontroller inside carries the high speed PWM generator, and the result that PI regulates compares the generation pwm signal with the inner triangular signal that carries.
4, pwm signal is directly controlled the direct current DC transfer circuit by chip for driving, regulates its output voltage, thereby reaches permanent power control.
Claims (2)
1, a kind of electric ballast constant-power control method that is used for high-intensity gas discharge lamp, the main circuit of ballast comprises direct current DC transfer circuit and full bridge inverter; Control system comprises microcontroller and chip for driving, and microcontroller has the high speed PWM generator of analog and digital signal transducer.It is characterized in that this method may further comprise the steps:
(1) analog-digital converter that carries of microcontroller inside is gathered the voltage signal current signal on the ballast main circuit, thereby obtains the current power value of bulb.
(2) digital PI regulates: microcontroller adopts the increment type algorithm that performance number is carried out PI and regulates.
(3) produce the digital PWM signal: microcontroller inside carries the high speed PWM generator and compares with the inner triangular signal that carries according to the result that PI regulates, and produces pwm signal.
(4) pwm signal is directly controlled the direct current DC transfer circuit by chip for driving, regulates its output voltage, thereby reaches permanent power control.
2. electric ballast constant-power control method according to claim 1 is characterized in that, by following equation performance number is carried out PI and regulates:
y
k＝y
k-1+(K
p+K
pK
I)e
k-K
pe
k-1，
In the formula: y
kThe k time output valve for pi regulator;
y
K-1The k-1 time output valve for pi regulator;
e
kWhen being the k time sampling, the difference between specified rate and the feedback quantity;
e
K-1When being the k-1 time sampling, the difference between specified rate and the feedback quantity;
K
IBe integral coefficient, Kp is a proportionality coefficient, all manually sets according to concrete control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100620314A CN101304627A (en) | 2008-05-23 | 2008-05-23 | Constant power control method for electric ballast of high-strength air discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100620314A CN101304627A (en) | 2008-05-23 | 2008-05-23 | Constant power control method for electric ballast of high-strength air discharge lamp |
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| Publication Number | Publication Date |
|---|---|
| CN101304627A true CN101304627A (en) | 2008-11-12 |
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ID=40114277
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100620314A Pending CN101304627A (en) | 2008-05-23 | 2008-05-23 | Constant power control method for electric ballast of high-strength air discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101304627A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178718A (en) * | 2013-02-28 | 2013-06-26 | 重庆大学 | Digital-control constant-power DC/DC converter |
-
2008
- 2008-05-23 CN CNA2008100620314A patent/CN101304627A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178718A (en) * | 2013-02-28 | 2013-06-26 | 重庆大学 | Digital-control constant-power DC/DC converter |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081112 |