CN109640452A - A kind of lighting circuit control method, control circuit and lighting circuit - Google Patents
A kind of lighting circuit control method, control circuit and lighting circuit Download PDFInfo
- Publication number
- CN109640452A CN109640452A CN201811644733.3A CN201811644733A CN109640452A CN 109640452 A CN109640452 A CN 109640452A CN 201811644733 A CN201811644733 A CN 201811644733A CN 109640452 A CN109640452 A CN 109640452A
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- Prior art keywords
- circuit
- voltage
- switch
- boost booster
- led light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
本发明公开了一种照明电路控制方法、控制电路及照明电路，输入电压经过BOOST升压电路对LED灯供电，所述LED灯通过第一开关连接到所述BOOST升压电路，当照明电路启动时，所述第一开关处于关断状态，延时第一时间后或当BOOST升压电路输出电压大于第一电压，控制所述第一开关导通。
The invention discloses a lighting circuit control method, control circuit and lighting circuit. An input voltage supplies power to an LED lamp through a BOOST booster circuit, and the LED lamp is connected to the BOOST booster circuit through a first switch. When the lighting circuit starts When the first switch is in an off state, the first switch is controlled to be turned on after a first time delay or when the output voltage of the booster circuit is greater than the first voltage.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of lighting circuit control method, control circuit and photograph
Bright circuit.
Background technique
Using the LED drive circuit of BOOST booster circuit, when starting, even if main switch turns off, input can lead to
It crosses inductance and freewheeling diode and gives output charging, therefore, voltage is had in output capacitance, LED light is caused to have pico- light.
When main switch starts to turn on and off, then output voltage rises rapidly, and output electric current reaches the value of setting, the brightness of LED light
For the brightness of setting.Therefore, when starting, LED light can first have pico- light, then, then reach the brightness of setting.Institute
With the start-up course using the LED drive circuit of BOOST circuit is unsmooth, and there are apparent step senses.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of lighting circuit control method, control circuit and lighting circuit,
To solve the problem of BOOST booster circuit first has low-light to reach setting again on startup in the prior art electric current.
The technical solution of the invention is as follows, provides a kind of lighting circuit control method, and input voltage boosts by BOOST
Circuit powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch, when lighting circuit starts
When, the first switch is in an off state, is delayed after first time or when BOOST booster circuit output voltage is greater than the first electricity
Pressure controls the first switch conducting.
As optional, when BOOST booster circuit short circuit, the first switch shutdown is controlled.
Another technical solution of the invention is to provide a kind of lighting circuit control method, and input voltage passes through BOOST
Booster circuit powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch, when there is dim signal
Or exchange input has light modulator, when exporting electric current less than the first electric current, controls the first switch shutdown.
As optional, when the reference voltage of BOOST booster circuit is less than tertiary voltage, the output electric current is characterized less than institute
The first electric current is stated, the output current feedback values and the reference voltage of BOOST booster circuit carry out operation amplifier, control BOOST
The duty ratio of main switch, so that the output current feedback values are close to the reference voltage.
Another technical solution of the invention is to provide a kind of lighting circuit control circuit, and input voltage passes through BOOST
Booster circuit powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch, when lighting circuit opens
When dynamic, the control circuit control first switch is in an off state, is delayed after first time or when BOOST booster circuit
Output voltage is greater than first voltage, and the control circuit controls the first switch conducting.
As optional, including voltage sampling circuit, the voltage sampling circuit receive the LED light and the first switch
Common end voltage, when lighting circuit starting, the control circuit controls the first switch shutdown, when the voltage sample
The input voltage of voltage is greater than the 4th voltage, and the control circuit controls the first switch conducting.
Another technical solution of the invention is to provide a kind of lighting circuit control circuit, and input voltage passes through BOOST
Booster circuit powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch, when there is dim signal
Or exchange input has light modulator, when exporting electric current less than the first electric current, the control circuit controls the first switch shutdown.
As optional, including current sampling resistor, the output electric current is detected by current sampling resistor, works as current sample
When pressure drop is less than second voltage on resistance, characterizes the output electric current and be less than first electric current.
As optional, when the reference voltage of BOOST booster circuit is less than tertiary voltage, the output electric current is characterized less than institute
The first electric current is stated, the output current feedback values and the reference voltage of BOOST booster circuit carry out operation amplifier, control BOOST
The duty ratio of main switch, so that the output current feedback values are close to the reference voltage.
Another technical solution of the invention is to provide a kind of lighting circuit.
Using circuit structure and method of the invention, compared with prior art, have the advantage that when starting,
LED light is switched on and off disconnection, be not in it is pico- shine, only when output voltage is set up, switch conduction, the electricity in LED light
Stream is raised to setting electric current from above freezing rapidly.
Detailed description of the invention
Fig. 1 is the circuit diagram of the lighting circuit in one embodiment of the invention；
Fig. 2 is the circuit diagram of the lighting circuit in another embodiment of the present invention；
Fig. 3 is the circuit diagram of the lighting circuit in another embodiment of the invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
BOOST booster circuit on startup, since output voltage is not when the main switch of BOOST circuit switchs
It waits, input gives output power supply by inductance and freewheeling diode, and output voltage can rise, and the LED light of output first has low-light.Work as master
When starting switch, output voltage is risen rapidly, and LED light reaches the electric current of setting again.Therefore human eye seems the starting
Journey can feel ill.
The present invention provides a kind of lighting circuit control method, please refers to shown in Fig. 1, and input voltage is by BOOST boosting electricity
Road powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch M02, when lighting circuit starts
When, the first switch M02 is in an off state, is delayed after first time or when BOOST booster circuit output voltage is greater than the
One voltage controls the first switch M02 conducting.BOOST booster circuit includes input capacitance C01, inductance L01, main switch
M01, sustained diode 01 and output capacitance C02.Input capacitance C01 is connected to switching node, switching node by inductance L01
The hot end of output is connected to by sustained diode 01, switching node is connected to by main switch M01 with reference to ground.It hands over
Stream input is connected to BOOST booster circuit, LED light and first switch M02 series connection by rectifier bridge, is connected to BOOST boosting electricity
The output end on road.
When starting, LED light is switched on and off disconnections, be not in it is pico- shine, after delay first time or work as BOOST
Booster circuit output voltage is greater than first voltage, when output voltage is set up, switch conduction, electric current in LED light rapidly from
It is above freezing to be raised to setting electric current.
BOOST booster circuit is in LED light short circuit, even if control main switch shutdown, LED light are still connected to output
On, therefore it is unable to control electric current when LED light short circuit.When having first switch and LED light is connected, it is short to detect that LED light occurs
The case where road, then controls the first switch shutdown, just flows through without electric current in LED light, substantially increase the reliability of system.
It,, can not be by LED in light modulation when LED light does not have tandem tap using the lighting circuit of BOOST booster circuit
Lamp shutdown, that is, dim signal wish that LED light is gone out, but BOOST circuit can work in minimum duty cycle, and LED light is also
It is to maintain bright.This is the defect that lighting circuit uses BOOST booster circuit.
In order to which LED light can not be turned off when solving the problems, such as light modulation, the present invention also provides a kind of lighting circuit control method,
Input voltage powers to LED light by BOOST booster circuit, and the LED light is connected to the BOOST by first switch and boosts
Circuit when exporting electric current less than the first electric current, controls the first switch and closes when having dim signal or exchange input to have light modulator
It is disconnected.
Dimming function is being had, when exporting low current, is being opened the light shutdown by control first, LED light is turned off.Solution
The problem of having determined in BOOST light adjusting circuit, LED light can not be turned off.
Dim signal can be simulation dim signal perhaps PWM dim signal or other dim signals.Exchange input
Light modulator can be controllable silicon dimmer or electronic light modulator or other light modulators.
In one embodiment, the output electric current is detected by current sampling resistor, when pressure drop on current sampling resistor
When less than second voltage, characterizes the output electric current and be less than first electric current.
In another embodiment, when the reference voltage of BOOST booster circuit is less than tertiary voltage, the output electricity is characterized
Stream is less than first electric current, and the output current feedback values and the reference voltage of BOOST booster circuit carry out operation amplifier, control
The duty ratio of BOOST main switch processed, so that the output current feedback values are close to the reference voltage.
The present invention provides a kind of lighting circuit control circuit again, please refers to shown in Fig. 1, and input voltage boosts by BOOST
Circuit powers to LED light, and the LED light is connected to the BOOST booster circuit by first switch, when lighting circuit starts
When, the control circuit control first switch is in an off state, is delayed after first time or when BOOST booster circuit is defeated
Voltage is greater than first voltage out, and the control circuit controls the first switch conducting.
It please refers to shown in Fig. 2, control circuit includes voltage sampling circuit, and the voltage sampling circuit receives the LED light
With the common end voltage of the first switch, when lighting circuit starting, the control circuit controls the first switch shutdown,
When the input voltage of the voltage sample voltage is greater than the 4th voltage, the control circuit controls the first switch conducting.
As an implementation, when the control circuit detects BOOST booster circuit short circuit, the control circuit
Control the first switch shutdown.
The present invention provides a kind of lighting circuit control circuit again, and input voltage supplies LED light by BOOST booster circuit
Electricity, the LED light are connected to the BOOST booster circuit by first switch, have light modulation when having dim signal or exchange to input
Device, when exporting electric current less than the first electric current, the control circuit controls the first switch shutdown.
In one embodiment, it please refers to shown in Fig. 3, including current sampling resistor, institute is detected by current sampling resistor
Output electric current is stated, when pressure drop is less than second voltage on current sampling resistor, the output electric current is characterized and is less than first electricity
Stream.
In one embodiment, when the reference voltage of BOOST booster circuit is less than tertiary voltage, the output electric current is characterized
Less than first electric current, the output current feedback values and the reference voltage of BOOST booster circuit carry out operation amplifier, control
The duty ratio of BOOST main switch, so that the output current feedback values are close to the reference voltage.
Another technical solution of the invention is to provide a kind of lighting circuit.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of lighting circuit control method, input voltage powers to LED light by BOOST booster circuit, it is characterised in that: institute
It states LED light and the BOOST booster circuit is connected to by first switch, when lighting circuit starting, the first switch is in
Off state, being delayed after first time or working as BOOST booster circuit output voltage is greater than first voltage, controls the first switch
Conducting.
2. lighting circuit control method according to claim 1, it is characterised in that: when BOOST booster circuit short circuit, control
The first switch shutdown.
3. a kind of lighting circuit control method, input voltage powers to LED light by BOOST booster circuit, it is characterised in that: institute
It states LED light and the BOOST booster circuit is connected to by first switch, have light modulator when thering is dim signal or exchange to input, it is defeated
When electric current is less than the first electric current out, the first switch shutdown is controlled.
4. lighting circuit control method according to claim 3, it is characterised in that: the reference voltage of BOOST booster circuit
When less than tertiary voltage, characterizes the output electric current and be less than first electric current, the output current feedback values of BOOST booster circuit
Operation amplifier is carried out with the reference voltage, the duty ratio of BOOST main switch is controlled, so that the output current feedback values connect
The nearly reference voltage.
5. a kind of lighting circuit control circuit, input voltage powers to LED light by BOOST booster circuit, it is characterised in that: institute
It states LED light and the BOOST booster circuit is connected to by first switch, when lighting circuit starting, the control circuit control
The first switch is in an off state, and being delayed after first time or working as BOOST booster circuit output voltage is greater than first voltage,
The control circuit controls the first switch conducting.
6. lighting circuit control circuit according to claim 5, it is characterised in that: including voltage sampling circuit, the electricity
Pressure sample circuit receives the common end voltage of the LED light and the first switch, when lighting circuit starting, the control electricity
Road controls the first switch shutdown, when the input voltage of the voltage sample voltage is greater than the 4th voltage, the control circuit
Control the first switch conducting.
7. a kind of lighting circuit control circuit, input voltage powers to LED light by BOOST booster circuit, it is characterised in that: institute
It states LED light and the BOOST booster circuit is connected to by first switch, have light modulator when thering is dim signal or exchange to input, it is defeated
When electric current is less than the first electric current out, the control circuit controls the first switch shutdown.
8. lighting circuit control circuit according to claim 7, it is characterised in that: including current sampling resistor, pass through electricity
It flows sampling resistor and detects the output electric current, when pressure drop is less than second voltage on current sampling resistor, characterize the output electricity
Stream is less than first electric current.
9. lighting circuit control circuit according to claim 7, it is characterised in that: the reference voltage of BOOST booster circuit
When less than tertiary voltage, characterizes the output electric current and be less than first electric current, the output current feedback values of BOOST booster circuit
Operation amplifier is carried out with the reference voltage, the duty ratio of BOOST main switch is controlled, so that the output current feedback values connect
The nearly reference voltage.
10. a kind of lighting circuit, it is characterised in that: including the control circuit as described in claim 5~9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811644733.3A CN109640452A (en) | 2018-12-29 | 2018-12-29 | A kind of lighting circuit control method, control circuit and lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811644733.3A CN109640452A (en) | 2018-12-29 | 2018-12-29 | A kind of lighting circuit control method, control circuit and lighting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109640452A true CN109640452A (en) | 2019-04-16 |
Family
ID=66055227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811644733.3A Pending CN109640452A (en) | 2018-12-29 | 2018-12-29 | A kind of lighting circuit control method, control circuit and lighting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109640452A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001313423A (en) * | 2000-04-28 | 2001-11-09 | Toshiba Lighting & Technology Corp | LED driver |
| JP2012119520A (en) * | 2010-12-01 | 2012-06-21 | Renesas Electronics Corp | Light-emitting diode drive circuit |
| TW201238390A (en) * | 2011-03-03 | 2012-09-16 | Monolithic Power Systems Inc | High dimming ratio control and short circuit protection for LED drive with step up converter |
| US20130271701A1 (en) * | 2012-04-12 | 2013-10-17 | Xiang Yang | LED Backlight Drive Circuit, Liquid Crystal Display Device and Driving Method |
| CN206226806U (en) * | 2016-11-03 | 2017-06-06 | 昆山龙腾光电有限公司 | lamp control device and lamp system |
-
2018
- 2018-12-29 CN CN201811644733.3A patent/CN109640452A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001313423A (en) * | 2000-04-28 | 2001-11-09 | Toshiba Lighting & Technology Corp | LED driver |
| JP2012119520A (en) * | 2010-12-01 | 2012-06-21 | Renesas Electronics Corp | Light-emitting diode drive circuit |
| TW201238390A (en) * | 2011-03-03 | 2012-09-16 | Monolithic Power Systems Inc | High dimming ratio control and short circuit protection for LED drive with step up converter |
| US20130271701A1 (en) * | 2012-04-12 | 2013-10-17 | Xiang Yang | LED Backlight Drive Circuit, Liquid Crystal Display Device and Driving Method |
| CN206226806U (en) * | 2016-11-03 | 2017-06-06 | 昆山龙腾光电有限公司 | lamp control device and lamp system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190416 |
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| RJ01 | Rejection of invention patent application after publication |