CN102131334A - System and method for controlling lighting current of electronic ballast - Google Patents
System and method for controlling lighting current of electronic ballast Download PDFInfo
- Publication number
- CN102131334A CN102131334A CN2011100949766A CN201110094976A CN102131334A CN 102131334 A CN102131334 A CN 102131334A CN 2011100949766 A CN2011100949766 A CN 2011100949766A CN 201110094976 A CN201110094976 A CN 201110094976A CN 102131334 A CN102131334 A CN 102131334A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- lighting
- pwm
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a system and a method for controlling lighting current of an electronic ballast. The system is equipped with two closed-loop feedback circuits and a PWM (pulse width modulation) control chip U1 based on a lighting circuit, wherein, two output terminals of the PWM control chip U1 are connected to half-bridge circuits Q1 and Q2 for driving the lighting circuit; the first closed-loop feedback circuit comprises a current transformer L, a rectifier diode D1, a voltage-regulator diode D2, a resistor R1 and a single-chip microprocessor (SCM) U2; the second closed-loop feedback circuit comprises a power detection resistor R2, a diode D3 and an operational amplifying circuit; and an output terminal of the SCM U2 is connected to one end of an integrating circuit resistor R3, and an output terminal VOUT of an operational amplifier U3 of the operational amplifying circuit is connected to an input terminal of the PWM control chip U1 through the diode D3. In the system, one closed-loop feedback circuit is used for detecting current by the current transformer, wherein, the current transformer converts the current into a voltage signal, and then the SCM processes the signal and outputs PWM wave; and the other closed-loop feedback circuit is used for detecting power, wherein, the operational amplifier amplifies a current signal, and the PWM control chip acquires and compares the two signals and then outputs high or low level so as to adjust PWM frequency, thus achieving the purpose of controlling lamp current.
Description
Technical field
The present invention relates to lighting current control system and control method thereof under a kind of electric ballast application, belong to the lighting control technique field.
Background technology
High-pressure sodium lamp is because the standard difference of manufacture craft difference or country variant makes the modulating voltage difference of high-pressure sodium lamp when the different capacity section of equal-wattage very big.
Traditional Inductive ballast is the constant current control type, and Inductive ballast is after coupling high-pressure sodium lamp igniting lamp is bright, and lamp current＜5A, and electric current substantial constant raise with the rising lamp power of modulating voltage, and modulating voltage is elevated to maximum, the lamp power stability.But because different high-pressure sodium lamp modulating voltage difference is big, power had difference when the lamp of different model or various criterion mated the Inductive ballast of same model, the too small performance of power not the performance of Inductive ballast, power is crossed conference and is reduced bulb life even damage bulb.Inductive ballast shows the defective with the matching difference of bulb.
Traditional electric ballast is permanent power control type, but arrives the stage of full power after igniting, and power is linear growth, the electric current of the uncontrollable lamp of power ascent stage.The V of electric ballast
BUSBe constant, can make the lamp power invariability, the difference that different bulbs can emergent power after full power by detecting electric current.Use at the coupling high-pressure sodium lamp, in order to keep the life-span of high-pressure sodium lamp, after igniting, initial power is set in the value proportional with full power, but the modulating voltage of some bulbs under the above-mentioned initial power that configures is very low, causes high-pressure sodium lamp very big at the igniting after-current, can't change yet power is linear growth, high-pressure sodium lamp is being worked the long period under big electric current, therefore can't keep the useful life of bulb effectively in addition after igniting a little while bulb just damage.So also inaccessible desirable degree of the traditional electric ballast and the matching of bulb.
Summary of the invention
Defective in view of above-mentioned prior art existence, the objective of the invention is to propose a kind of lighting current control system and control method thereof of electric ballast, non-constant with the lighting current that solves under the electric ballast application, or the excessive defective that influences the lighting life-span of electric current.
Above-mentioned first purpose of the present invention with technical scheme is:
The lighting current control system of electric ballast, it is characterized in that: described current control system is provided with two-way closed loop feedback circuit and a pwm chip U1 based on lighting circuit, two outputs of described pwm chip U1 are connected in order to drive the half-bridge circuit Q1 and the Q2 of lighting circuit, wherein the first via is the current detecting closed loop feedback circuit of lighting circuit, comprises current transformer L, rectifier diode D1, voltage stabilizing didoe D2, resistance R 1 and single-chip microcomputer U2; The second the tunnel is power detection closed loop feedback circuit, comprises power detection resistance R 2, integrating circuit, the diode D3 that is made of resistance R 3 and capacitor C 3 and the operational amplification circuit that comprises amplifier U3 and U4; The output of described single-chip microcomputer U2 is connected to an end of integrating circuit resistance R 3, the output V of described operational amplification circuit amplifier U3
OUTBe connected to the input of pwm chip U1 through diode D3.
Further, described pwm chip U1 is at least SG3525AN, and described single-chip microcomputer U2 is at least 12F508, and described operational amplification circuit is at least LM324, and the lighting source in the described lighting circuit is a high-pressure sodium lamp.
Above-mentioned second purpose of the present invention, based on the lighting current control system realization of purpose one, its technical solution comprises step:
I, employing electric ballast are lighted the high-pressure sodium lamp in the lighting circuit, set the original frequency of pwm chip U1, make lighting circuit have an initial power;
II, with the initial current of lighting circuit behind current transformer conversion, diode rectification, input single-chip microcomputer U2 handles, the pwm signal of gained is handled the V+ that amplifier U3 is imported in the back through integrating circuit again, according to resulting V
OUTModulation (PWM) control chip U1 output frequency, and then regulate the power and the electric current of lighting circuit, reach default maximum rated current until the electric current of lighting circuit.
Further, when the lighting circuit electric current under the initial power during less than maximum rated current, V
OUTBe output as high level, the output frequency of pwm chip reduces, and the power and the electric current of lighting circuit all increase; When the lighting circuit electric current under the initial power during greater than maximum rated current, V
OUTBe output as low level, the output frequency of pwm chip increases, and the power and the electric current of lighting circuit all reduce.
The lighting current control system and the control method thereof of electric ballast of the present invention, its outstanding effect is: by the power at the basic adjusted lamp of constant lamp current, in the autonomous rising of modulating voltage, increase the power of lamp, it is also stable to stablize back light power at modulating voltage, it is constant always to reach high-pressure sodium lamp lamp current after lighting, in the also constant purpose of full power back light power.Changed traditional electric ballast power linear growth after high-pressure sodium lamp is lighted, electric current is non-constant, damages the shortcoming of bulb and bulb matching difference easily.
Following constipation closes the embodiment accompanying drawing, the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.
Description of drawings
Fig. 1 is the basic circuit diagram of lighting current control system of the present invention.
Embodiment
For the inconstant present situation of the lamp current that solves electric ballast effectively, the present invention proposes a kind of lighting current controlling schemes of electric ballast, specific to system and two aspects of control method thereof.This programme adopts the mode of two-way closed loop feedback to control the lamp current of electric ballast.One tunnel closed loop feedback electric current by the current transformer sensed lamp current, and is converted to voltage signal with detected current signal and sends into single-chip microcomputer, and programming has program in the single-chip microcomputer, output pwm signal behind the program control single-chip microcomputer processes voltage signal.Lamp current is arranged on certain value, and the pwm signal of single-chip microcomputer output becomes a voltage signal behind integrating circuit.Another road closed loop feedback circuit is by the power of the voltage detecting lamp on the power resistor, by the voltage signal of an operational amplifier with an amplification of voltage amplification output.The voltage of two-way closed loop feedback circuit output compares mutually, and output high level or low level are regulated the frequency of oscillation of pwm chip.
Pwm chip output drives the field effect transistor alternation in the half-bridge, and the frequency of regulating output can be regulated the power of lamp.When the frequency increase of signal, lamp power reduces; When the frequency of signal reduces, lamp power increases.
High-pressure sodium lamp (hereinafter to be referred as " lamp ") modulating voltage after lighting can independently rise, and it is just constant to rise to certain value power.The lamp current controlling schemes that is used for electric ballast of the present invention is passed through the power at the basic adjusted lamp of constant lamp current, in the autonomous rising of modulating voltage, increase the power of lamp, it is also stable to stablize back light power at modulating voltage, it is constant always to reach high-pressure sodium lamp lamp current after lighting, in the also constant purpose of full power back light power.Changed traditional electric ballast power linear growth after high-pressure sodium lamp is lighted, electric current is non-constant, damages the shortcoming of bulb and bulb matching difference easily.
The lights control scheme that is used for electric ballast of the present invention is shown in Figure 1, comprise pwm chip U1, U1 is SG3525AN, half-bridge circuit Q1 and Q2, lighting circuit, current transformer L, rectifier diode D2, diode D3, resistance R 1 and R2, single-chip microcomputer U2, U2 are 12F508, two operational amplifier U3 among the operational amplifier LM324 and U4.
The output A of U1 is connected half-bridge circuit with output B, the frequency of oscillation of control U1 can control loaded to the power of high-pressure sodium lamp, after electric ballast was lighted high-pressure sodium lamp, original frequency of U1 setting made high-pressure sodium lamp that an initial power be arranged.Require the electric current of high-pressure sodium lamp to be 5A to the maximum, L detects the electric current of lighting mains, electric current is transformed to low current with certain proportion, through D1 rectification and R1 electrorheological voltage, produce a voltage at the R1 two ends, again by the 5 pin input voltage signals of voltage stabilizing didoe D2 at single-chip microcomputer U2, output pwm signal after single-chip microcomputer is handled, behind integrating circuit R3 and C3, output voltage V+.When lamp current＞5A, the duty ratio of pwm signal reduces, and the V+ behind the integration also reduces; When lamp current＜5A, the duty ratio of pwm signal increases, and the V+ behind the integration also increases;
R2 is the power detection resistance of lamp, and the voltage on the R2 raises with power by the voltage signal V-of an amplification of operational amplifier U4 output, and V-increases.V+ and V-relatively export V by comparator U3
OUTIf the electric current＞5A of high-pressure sodium lamp under initial power, V+ constantly reduces, up to V-＞V+, this moment V
OUTBe low level, the output frequency of pwm chip increases, and then lamp power and lamp current all reduce; If the electric current＜5A of high-pressure sodium lamp under initial power, V+ constantly increases, up to V-＜V+, this moment V
OUTBe high level, the output frequency of pwm chip reduces, and then lamp power and lamp current all increase.
By above-mentioned feedback system, it is constant that the electric current of high-pressure sodium lamp keeps, and along with the rising of modulating voltage, the power of lamp constantly rises, V-=V+ when full power, and the frequency of pwm chip no longer changes, the lamp power invariability.
More than being detailed description of the invention, to deepen the understanding of the present invention, is not to limit various ways of the present invention, allly simply revises circuit structure or element model parameter based on technical scheme of the present invention, all at the protection range of this patent request.
Claims (5)
1. the lighting current control system of electric ballast, it is characterized in that: described current control system is provided with two-way closed loop feedback circuit and a pwm chip U1 based on lighting circuit, two outputs of described pwm chip U1 are connected in order to drive the half-bridge circuit Q1 and the Q2 of lighting circuit, wherein the first via is the current detecting closed loop feedback circuit of lighting circuit, comprises current transformer L, rectifier diode D1, voltage stabilizing didoe D2, resistance R 1 and single-chip microcomputer U2; The second the tunnel is modulation operation closed loop feedback circuit, comprises power detection resistance R 2, integrating circuit, the diode D3 that is made of resistance R 3 and capacitor C 3 and the operational amplification circuit that comprises amplifier U3 and U4; The output of described single-chip microcomputer U2 is connected to an end of integrating circuit resistance R 3, the output V of described operational amplification circuit amplifier U3
OUTBe connected to the input of pwm chip U1 through diode D3.
2. the lighting current control system of electric ballast according to claim 1, it is characterized in that: described pwm chip U1 is at least SG3525AN, and described single-chip microcomputer U2 is at least 12F508, and described operational amplification circuit is at least LM324.
3. the lighting current control system of electric ballast according to claim 1, it is characterized in that: the lighting source in the described lighting circuit is a high-pressure sodium lamp.
4. the lighting current control method of electric ballast, realize based on the described lighting current control system of claim 1, it is characterized in that comprising step: I, adopt electric ballast to light high-pressure sodium lamp in the lighting circuit, set the original frequency of pwm chip U1, make lighting circuit have an initial power; II, with the initial current of lighting circuit behind current transformer conversion, diode rectification, input single-chip microcomputer U2 handles, the pwm signal of gained is handled the V+ that amplifier U3 is imported in the back through integrating circuit again, according to resulting V
OUTThe output frequency of modulation (PWM) control chip U1, and then regulate the power and the electric current of lighting circuit reaches default maximum rated current until the electric current of lighting circuit.
5. the lighting current control method of electric ballast according to claim 4 is characterized in that: when the lighting circuit electric current under the initial power during less than maximum rated current, and V
OUTBe output as high level, the output frequency of pwm chip reduces, and the power and the electric current of lighting circuit all increase; When the lighting circuit electric current under the initial power during greater than maximum rated current, V
OUTBe output as low level, the output frequency of pwm chip increases, and the power and the electric current of lighting circuit all reduce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110094976.6A CN102131334B (en) | 2011-04-15 | 2011-04-15 | System and method for controlling lighting current of electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110094976.6A CN102131334B (en) | 2011-04-15 | 2011-04-15 | System and method for controlling lighting current of electronic ballast |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102131334A true CN102131334A (en) | 2011-07-20 |
| CN102131334B CN102131334B (en) | 2014-04-16 |
Family
ID=44269199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110094976.6A Active CN102131334B (en) | 2011-04-15 | 2011-04-15 | System and method for controlling lighting current of electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102131334B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404921A (en) * | 2011-12-03 | 2012-04-04 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN103052246A (en) * | 2012-12-30 | 2013-04-17 | 北京自动测试技术研究所 | Electronic ballast with controllable power |
| CN105848390A (en) * | 2016-05-23 | 2016-08-10 | 安徽捷迅光电技术有限公司 | Constant voltage and current driving design based on operational amplifier proportional and integral circuits |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
| CN201369866Y (en) * | 2009-03-10 | 2009-12-23 | 李建伟 | Pulse width modulation electronic ballast |
| CN101772250A (en) * | 2010-02-08 | 2010-07-07 | 海洋王照明科技股份有限公司 | Dimmable electronic ballast |
-
2011
- 2011-04-15 CN CN201110094976.6A patent/CN102131334B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
| CN201369866Y (en) * | 2009-03-10 | 2009-12-23 | 李建伟 | Pulse width modulation electronic ballast |
| CN101772250A (en) * | 2010-02-08 | 2010-07-07 | 海洋王照明科技股份有限公司 | Dimmable electronic ballast |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404921A (en) * | 2011-12-03 | 2012-04-04 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN102404921B (en) * | 2011-12-03 | 2014-01-01 | 南京普天大唐信息电子有限公司 | Output current adjustable intelligent constant current power supply device |
| CN103052246A (en) * | 2012-12-30 | 2013-04-17 | 北京自动测试技术研究所 | Electronic ballast with controllable power |
| CN103052246B (en) * | 2012-12-30 | 2015-10-28 | 北京自动测试技术研究所 | The electric ballast that a kind of power is controlled |
| CN105848390A (en) * | 2016-05-23 | 2016-08-10 | 安徽捷迅光电技术有限公司 | Constant voltage and current driving design based on operational amplifier proportional and integral circuits |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102131334B (en) | 2014-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102769959B (en) | LED light-dimming driving circuit | |
| CN101742771B (en) | Portable type lamp, light dimming circuit and light dimming method | |
| CN201422183Y (en) | High-power LED lamp drive device | |
| CN103442501B (en) | Forced constant flow source dimming LED (Light Emitting Diode) lamp | |
| CN203722871U (en) | LED drive circuit system and LED drive control circuit | |
| CN205596389U (en) | Constant current AC drive circuit and TV set | |
| CN103533707B (en) | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit | |
| CN103427656A (en) | Staggered parallel flyback LED driving power supply and PFM (pulse width modulation) control circuit thereof | |
| CN104300773A (en) | Simple self-adaptation dummy-load circuit | |
| CN203618179U (en) | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit | |
| CN204465954U (en) | A kind of LED lamp drive circuit with dimming function | |
| CN2862144Y (en) | Constant-current source apparatus | |
| CN102131334B (en) | System and method for controlling lighting current of electronic ballast | |
| CN111436174A (en) | High-efficient constant current drive power supply equipment | |
| CN201219310Y (en) | Constant-current supply for LED road lamp | |
| CN201860494U (en) | Light-emitting diode driving circuit with light modulating sequential control | |
| CN104349541A (en) | Over-temperature protection device and over-temperature protection method thereof | |
| CN102469655A (en) | Light-emitting diode (LED) driving circuit | |
| CN107548206A (en) | By identifying that LED Vf values adjust the driving power circuit of output voltage | |
| CN102611316A (en) | Flyback converter controlled constant-current output circuit and method | |
| CN201528453U (en) | LED constant current source capable of half-power controlling | |
| CN203151838U (en) | Temperature control current regulator for high-power LED (light-emitting diode) lamp | |
| CN206575634U (en) | A kind of dimming control switch LED constant current power supply | |
| CN203675384U (en) | LED lamp driver | |
| CN203775499U (en) | LED (light-emitting diode) pulse drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215143 Jiangsu city of Suzhou province Xiangcheng District Huang Tai Town Spring Road No. 16 East Gate Patentee after: At Suzhou power technology Limited by Share Ltd Address before: 215143 Jiangsu city of Suzhou province Xiangcheng District Huang Tai Town Spring Road No. 16 East Gate Patentee before: Lumlux Lighting (Suzhou) Inc. |