CN108811248A - Light adjusting circuit and lamps and lanterns - Google Patents
Light adjusting circuit and lamps and lanterns Download PDFInfo
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- CN108811248A CN108811248A CN201810681398.8A CN201810681398A CN108811248A CN 108811248 A CN108811248 A CN 108811248A CN 201810681398 A CN201810681398 A CN 201810681398A CN 108811248 A CN108811248 A CN 108811248A
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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]
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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]
- H05B45/10—Controlling the intensity of the light
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
本公开是关于调光电路以及灯具。该调光电路包括：驱动芯片；稳压输出电路，连接所述驱动芯片，用于配合所述驱动芯片为至少两个采样电路提供稳定的电压；所述至少两个采样电路，所述至少两个采样电路并联连接，每个所述采样电路均包括串联的第一开关和电阻；控制电路，连接各个所述第一开关，用于控制各个所述第一开关的开关状态；灯珠，与所述至少两个采样电路串联连接。该技术方案可以通过控制电路控制各个第一开关的开关状态，来改变流向所述灯珠的电流的大小，进而调整灯珠的亮度，调整方便，电路结构简单易实现。
The present disclosure relates to dimming circuits and lamps. The dimming circuit includes: a driver chip; a voltage stabilizing output circuit, connected to the driver chip, used to cooperate with the driver chip to provide stable voltage for at least two sampling circuits; the at least two sampling circuits, the at least two The sampling circuits are connected in parallel, and each of the sampling circuits includes a first switch and a resistor connected in series; a control circuit, connected to each of the first switches, is used to control the switching state of each of the first switches; the lamp bead, connected to each of the first switches, is connected in parallel. The at least two sampling circuits are connected in series. In this technical solution, the magnitude of the current flowing to the lamp bead can be changed by controlling the switch state of each first switch through the control circuit, and then the brightness of the lamp bead can be adjusted, and the adjustment is convenient, and the circuit structure is simple and easy to realize.
Description
Technical field
This disclosure relates to electron electric power technical field more particularly to light adjusting circuit and lamps and lanterns.
Background technology
With the rapid development of modern science and technology, new product, new technology are maked rapid progress, LED (Light Emitting
Diode, light emitting diode) as a kind of long lifespan, light efficiency is high, radiation is low is rapidly connect by market with illuminating product low in energy consumption
By existing LED actuation techniques also reach its maturity.How to allow user it is random, the convenient LED luminance that adjusts become technology
The new target of personnel.
Invention content
The embodiment of the present disclosure provides light adjusting circuit and lamps and lanterns.The technical solution is as follows：
According to the first aspect of the embodiments of the present disclosure, a kind of light adjusting circuit is provided, including：
Driving chip；
Voltage-stabilizing output circuit connects the driving chip, for coordinating the driving chip to be at least two sample circuits
Stable voltage is provided；
At least two sample circuit, at least two sample circuit are connected in parallel, and each sample circuit is equal
Including concatenated first switch and resistance；
Control circuit connects each first switch, the on off state for controlling each first switch；
Lamp bead is connected in series with at least two sample circuit.
In one embodiment, the lamp bead includes LED lamp, and the driving chip includes LED driving cores
Piece；The LED drive chip, including voltage input end, light modulation end, pressure feedback port, ground terminal, output end；In the ground connection
Second switch is equipped between end and output end, the voltage input end connects supply voltage, is received in light modulation termination default
The pressure difference between supply voltage on signal and feedback voltage and the voltage input end on the pressure feedback port is less than ginseng
When examining voltage, the second switch is connected to the ground terminal and the output end.
In one embodiment, the voltage-stabilizing output circuit, including inductance and afterflow sub-circuit, the first end of the inductance
The cathode of the LED light is connected, the second end of the inductance connects the output end；The first end of the afterflow sub-circuit connects
The second end of the output end, the afterflow sub-circuit connects the first end of the sample circuit, and the afterflow sub-circuit is used for
When the second switch disconnects, provided at least two sample circuit by the electric energy that is stored in the inductance stable
Voltage；
The first end of at least two sample circuit, each sample circuit connects supply voltage, each described to adopt
The second end of sample circuit connects pressure feedback port；
The LED light, the anode of the LED light connect the second end of the sample circuit.
In one embodiment, the first switch includes triode.
In one embodiment, the first switch includes P type metal oxide semiconductor field-effect PMOS tube.
In one embodiment, the control circuit includes the first micro-control unit；
First micro-control unit, for controlling each first switch according to the dim signal received
On off state.
In one embodiment, the afterflow sub-circuit includes fly-wheel diode.
In one embodiment, the fly-wheel diode includes Schottky diode.
In one embodiment, the light adjusting circuit further includes：Second micro-control unit；Second micro-control unit
Output end connects the light modulation end, is used for the light modulation end input pulse width modulation (PWM) signal, the preset signals packet
Include high level signal.
According to the second aspect of the embodiment of the present disclosure, a kind of lamps and lanterns, including above-mentioned light adjusting circuit are provided.
The technical scheme provided by this disclosed embodiment can include the following benefits：The present embodiment can be defeated by voltage stabilizing
Go out circuit cooperation driving chip and stable voltage is provided at least two sample circuits；At least two sample circuits parallel connection connects
It connects, each sample circuit includes concatenated first switch and resistance；Control circuit connects each first switch,
On off state for controlling each first switch；Lamp bead is connected in series with at least two sample circuit；Thus
The on off state that each first switch can be controlled by control circuit, to change the size for the electric current for flowing to the lamp bead, into
And the brightness of lamp bead is adjusted, easy to adjust, circuit structure is simply easily realized.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is a kind of schematic diagram of light adjusting circuit shown according to an exemplary embodiment.
Fig. 2 is a kind of schematic diagram of light adjusting circuit shown according to an exemplary embodiment.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Fig. 1 is a kind of schematic diagram of light adjusting circuit shown according to an exemplary embodiment, as shown in Figure 1, the circuit packet
Driving chip 11 is included, voltage-stabilizing output circuit 12, at least two sample circuits 13 (include schematically two sample circuits in Fig. 1
13), control circuit 14, lamp bead 15.
Here, voltage-stabilizing output circuit 12 connects the driving chip, for coordinate the driving chip 11 be this at least two
A sample circuit 13 provides stable voltage；At least two sample circuit 13 is connected in parallel, each sample circuit 13
Include concatenated first switch k1 and resistance R；Control circuit 14 connects each first switch, for controlling each institute
State the on off state of first switch；Lamp bead 15 is connected in series with at least two sample circuit 13；Wherein, in control circuit
When the on off state difference of the 14 each first switch k1 of control, the size of current for flowing to the lamp bead 15 is different.The lamp bead
15 for by the change of electric current change the lamp bead of light emission luminance, exemplary, which can be LED light, QLED
(Quantum Dot Light Emitting Diodes, light emitting diode with quantum dots) lamp, OLED (Organic Light
Emitting Diode, organic electroluminescent diode) lamp etc., in this way, control circuit 14 can flow to institute by control
The size of current of lamp bead 15 is stated to adjust the light emission luminance of lamp bead 15.
It is exemplary, it is assumed that voltage-stabilizing output circuit 12 coordinates the driving chip 11 to be that two sample circuits 13 in Fig. 1 carry
It is U for stable voltage, when the resistance value of the resistance in two sample circuits 13 is R1, then controls two in control circuit 14
When a first switch k1 is in connected state, electric current I=U/ (R1//R1)=U/ (R1/2) of the lamp bead 15 is flowed to；It is controlling
One in two first switch k1 of the control of circuit 14 processed is in connected state, when another is off, described in flow direction
The electric current I=U/R1 of lamp bead 15；In this way, the on off state of each first switch k1 can be controlled by control circuit 14, to change
Become the size for the electric current for flowing to the lamp bead 15, and then adjust the brightness of lamp bead 15, easy to adjust, circuit structure is simple easily real
It is existing.
What needs to be explained here is that the resistance value of the resistance R in each sample circuit 13 can be the same or different, each
The model of first switch k1 in sample circuit 13 can be the same or different.Voltage-stabilizing output circuit 12 is that the sample circuit carries
The size of the burning voltage of confession can be adjusted according to actual conditions, as long as ensureing after voltage determines according to actual conditions,
Ensure the voltage stabilization at the sample circuit both ends.
The present embodiment can provide stabilization by the driving chip with voltage-stabilizing output circuit at least two sample circuits
Voltage；At least two sample circuit is connected in parallel, and each sample circuit includes concatenated first switch and resistance；
Control circuit connects each first switch, the on off state for controlling each first switch；Lamp bead, and it is described
At least two sample circuits are connected in series with；The on off state of each first switch k1 can be thus controlled by control circuit,
Change the size for the electric current for flowing to the lamp bead, and then adjust the brightness of lamp bead, easy to adjust, circuit structure is simple easily real
It is existing.
In a kind of possible embodiment, Fig. 2 is a kind of showing for light adjusting circuit shown according to an exemplary embodiment
It is intended to.The lamp bead 15 includes LED light, and the driving chip 11 includes LED drive chip, as shown in Fig. 2, the LED drives
Chip includes voltage input end 111, light modulation end (i.e. the ends ADJ) 112, pressure feedback port 113, ground terminal 114, output end 115；
Second switch k2 is equipped between the ground terminal 114 and output end 115, the voltage input end 11 connects supply voltage VDD,
The feedback voltage V on preset signals and the pressure feedback port 113 is received at the light modulation end 112FBWith the control source
Supply voltage V on end 111DDBetween pressure difference when being less than reference voltage U2, the second switch k2 is connected to the ground terminal 114
With the output end 115.Exemplary, which includes RT8471 chips.
In a kind of possible embodiment, as shown in Fig. 2, the voltage-stabilizing output circuit 12, including inductance 121 and afterflow
The first end of sub-circuit 122, the inductance 121 connects the lamp bead 15 i.e. cathode of LED light, the second end of the inductance 121
Connect the output end 115；The first end of the afterflow sub-circuit 122 connects the output end 115, the afterflow sub-circuit
122 second end connects the first end of the sample circuit 13, and the afterflow sub-circuit 122 is used for disconnected in the second switch k2
It is that at least two sample circuit 13 provides stable voltage by the electric energy stored in the inductance 121 when opening.It is described extremely
Few two sample circuits 13, the first end connection supply voltage V of each sample circuit 13DD, each sample circuit 13
Second end connect pressure feedback port 113.The lamp bead 15 is that the anode of LED light connects the second end of the sample circuit 13,
Lamp bead 15 is the first end of the cathode connection inductance 121 of LED light.
Here, driving chip powers on voltage VDDAfterwards, under original state, second switch k2 is disconnected, at the light modulation end
112 when receiving preset signals, the feedback voltage V on the pressure feedback port 113FBWith the electricity on the voltage input end 111
Source voltage VDDBetween pressure difference be 0 to be less than reference voltage U2, at this point, the second switch k2 is connected to the ground terminal 114 and institute
State output end 115, the feedback voltage V on the pressure feedback port 113FBWith the supply voltage V on the voltage input end 111DD
Between pressure difference be to become larger to reference voltage U2, during this, inductance 121 starts to charge up, when pressure difference is more than U2, described second
Switch k2 disconnects the connection between the ground terminal 114 and the output end 115, at this point, inductance 121 starts to discharge electric energy, leads to
It crosses afterflow sub-circuit 122 and stable voltage U2 is provided for three sample circuits；In the process, on the pressure feedback port 113
Feedback voltage VFBWith the supply voltage V on the voltage input end 111DDBetween pressure difference when becoming smaller than reference voltage U2,
Cause the second switch k2 to be connected to the ground terminal 114 and the output end 115, ensures to provide stabilization for three sample circuits
Voltage U2, such second switch k2 constantly disconnect closing so that the voltage at 13 both ends of sample circuit is maintained at stationary value U2.
Here, it when the resistance value of the resistance in three sample circuits 13 shown in Fig. 2 is R2, is then controlled in control circuit 14
When three first switch k1 of system are in connected state, electric current I=U2/ (R2//R2//R2)=U2/ of the lamp bead 15 is flowed to
(R2/3)；One in control circuit 14 controls a first switch k1 is in connected state, and another two is off
When, flow to the electric current I=U2/ R2 of the lamp bead 15；The company of being in control circuit 14 controls two first switch k1
Logical state, when another two is off, flows to electric current I=U2/ (R2//R2)=U2/ (R2/2) of the lamp bead 15.Such as
This, can control the on off state of each first switch k1 by control circuit 14, to change the electric current for flowing to the lamp bead
Size, and then the brightness of lamp bead is adjusted, easy to adjust, circuit structure is simply easily realized.
Voltage-stabilizing output circuit in the present embodiment, including inductance and afterflow sub-circuit, the inductance first end connection described in
The second end of the cathode of lamp bead, the inductance connects the output end；The first end of the afterflow sub-circuit connects the output
End, the second end of the afterflow sub-circuit connect the first end of the sample circuit, and the afterflow sub-circuit is used for described the
When two switches disconnect, stable voltage is provided at least two sample circuit by the electric energy stored in the inductance；Institute
At least two sample circuits are stated, the first end of each sample circuit connects supply voltage, and the of each sample circuit
Two ends connect pressure feedback port；The LED light, the anode of the LED light connect the second end of the sample circuit；In this way, real
Stable voltage is now provided for sample circuit, is realized simple.
In a kind of possible embodiment, first switch k1 includes triode, and triode operation is in cut-off region and satisfies
And area, it is equivalent to the cut-out and conducting of circuit.Since it has the function of completing open circuit and connecting, it is widely used in various open
In powered-down road, the emitter of the triode can connect control circuit 14, and 14 input voltage vin of control circuit controls three pole of switch
The unlatching (open) of pipe is acted with (closed) is closed, and when triode is in open state, load current is just blocked, conversely,
When triode is in closed state, electric current can circulate.Specifically, when Vin is low-voltage, since base stage is without electricity
Stream, therefore collector also no current, cause the load for being connected to collector terminal also without electric current, and are equivalent to and switch on,
Triode is working in the area cut-off (cut off) at this time.Similarly, when Vin is high voltage, due to there is base current flowing, because
This makes collector flow through the amplification electric current of bigger, therefore load circuit is just switched on, and is equivalent to the closure of switch, at this time three pole
Pipe is working in saturation region (saturation).
The present embodiment can be used as first switch using triode, realize simple.
In a kind of possible embodiment, as shown in Fig. 2, first switch k1 includes PMOS (Positive
Channel Metal Oxide Semiconductor, P type metal oxide semiconductor field-effect) pipe.
Here, when PMOS tube switchs, base stage is connected to control circuit, and source electrode can be connected by resistance R as shown in Figure 2
To supply voltage VDD, at this point, drain electrode connection lamp bead 15；Alternatively, source electrode can also be connected directly to supply voltage VDD, at this point, leakage
Pole passes through resistance R connections lamp bead 15.In this way, control circuit 14 is when to base stage input high level signal, PMOS switch can be opened,
When to base stage input low level signal, PMOS switch can close control circuit 14.
The present embodiment can use PMOS tube as first switch, realize simple.
In a kind of possible embodiment, the control circuit 14 includes the first micro-control unit (Micro Control
Unit, MCU).
Here, which can be the first micro-control unit, first micro-control unit, be received for basis
Dim signal control the on off state of each first switch.
Exemplary, user can input dim signal by external switch key, as user's pressing switch key is primary
When opening the LED light, the dim signal of input is that light is adjusted to most bright signal by instruction, at this point, the first micro-control unit can
It is in closed state to control each first switch, ensures that the electric current for flowing into lamp bead is maximum, keeps the lamp bead most bright；It is continuous in user
Pressing switch key is when opening the lamp bead twice, and the dim signal of input be to indicate for light to be adjusted to most dark signal, at this point, the
One micro-control unit can control a first switch and be in closed state, other are in off-state, ensure to flow into lamp
The electric current of pearl is minimum, keeps the lamp bead most dark.
The present embodiment can be by the first micro-control unit according to the dim signal control described each described first received
The on off state of switch, it is easy to adjust quick.
In a kind of possible embodiment, the afterflow sub-circuit includes fly-wheel diode.
Here, fly-wheel diode can be used together with energy-storage travelling wave tube inductance 121, be prevented when second switch k2 is disconnected
The voltage and current of sample circuit is mutated, and provides access, and inductance 121 can pass through the fly-wheel diode to be continued to sample circuit offer
Voltage, in order to avoid load voltage be mutated, play the role of smooth voltage can be provided at least two sample circuit it is stable
Voltage.
The present embodiment can use fly-wheel diode as afterflow sub-circuit, thus can when second switch disconnects,
Stable voltage is provided at least two sample circuit by the electric energy stored in the inductance, is realized simple.
In a kind of possible embodiment, the fly-wheel diode includes Schottky diode.
Here, which is the low-power consumption to come out, high current, ultra-speed semiconductor device, Reverse recovery
Time is extremely short (may diminish to several nanoseconds), therefore switching speed is very fast, and switching loss is also especially small, is particularly suitable for high frequency and answers
With.
Fly-wheel diode in the present embodiment includes Schottky diode, and switching speed is very fast, and switching loss is also special
It is small, it is suitable for frequency applications.
In a kind of possible embodiment, as shown in Fig. 2, the light adjusting circuit further includes：Second micro-control unit 16；
The output end of second micro-control unit 16 connects the light modulation end 112, for inputting PWM to the light modulation end 112
(Pulse Width Modulation, pulse width modulation) signal, at this point, the preset signals include high level signal.I.e.
The feedback voltage V on high level signal and the pressure feedback port 113 is received at the light modulation end 112FBIt is defeated with the voltage
Enter the supply voltage V on end 111DDBetween pressure difference when being less than reference voltage U2, the second switch k2 is connected to the ground terminal
114 and the output end 115.
Correspondingly, here, when the resistance value of the resistance in three sample circuits 13 shown in Fig. 2 is R2, then controlling
Circuit 14 controls three first switch k1 when being in connected state, flow to the electric current I=U2* duty ratios of the lamp bead 15/
(R2//R2//R2)=U2* duty ratios/(R2/3), the duty ratio are the duty ratio of pwm signal；One is controlled in control circuit 14
One in a first switch k1 is in connected state, when another two is off, flows to the electric current I=of the lamp bead 15
U2* duty ratios/R1；One in control circuit 14 controls two first switch k1 is in connected state, and another two is in disconnected
When open state, electric current I=U2* duty ratios/(R2//R2)=U2* duty ratios/(R2/2) of the lamp bead 15 is flowed to.In this way, can
To control the on off state of each first switch k1 by control circuit 14, to change the size for the electric current for flowing to the lamp bead,
And then the brightness of lamp bead is adjusted, easy to adjust, circuit structure is simply easily realized.
The present embodiment can further include the second micro-control unit with circuit；The output end of second micro-control unit connects institute
Light modulation end to be stated, is used for the light modulation end input pulse width modulation (PWM) signal, the preset signals include high level signal,
In this way, the on off state of the second switch inside control driving chip, it is convenient to realize.
The present embodiment also discloses a kind of lamps and lanterns, which includes above-mentioned light adjusting circuit；In this way, user is using lamps and lanterns
When, so that it may to adjust the brightness of the lamp bead as desired by light adjusting circuit.
The present embodiment can adjust the brightness of lamp bead in the lamps and lanterns by light adjusting circuit, simple in structure, easy to adjust.
Those skilled in the art will readily occur to its of the disclosure after considering specification and putting into practice disclosure disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810681398.8A CN108811248B (en) | 2018-06-27 | 2018-06-27 | Dimming circuits and lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810681398.8A CN108811248B (en) | 2018-06-27 | 2018-06-27 | Dimming circuits and lamps |
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| Publication Number | Publication Date |
|---|---|
| CN108811248A true CN108811248A (en) | 2018-11-13 |
| CN108811248B CN108811248B (en) | 2022-06-10 |
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| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
| CN202713692U (en) * | 2012-05-11 | 2013-01-30 | 京东方科技集团股份有限公司 | Dimming circuit of light-emitting diode unit |
| CN103347341A (en) * | 2013-07-12 | 2013-10-09 | 惠州伟志电子有限公司 | Novel high-power fishing lamp wireless control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001015265A (en) * | 1999-06-30 | 2001-01-19 | West Electric Co Ltd | El device and this el device built-in electronic equipment |
| CN201114903Y (en) * | 2007-08-24 | 2008-09-10 | 周志邦 | High power LED dimming drive circuit |
| CN101572974A (en) * | 2009-04-17 | 2009-11-04 | 上海晶丰明源半导体有限公司 | High efficiency constant current LED drive circuit and drive method |
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| CN108811248B (en) | 2022-06-10 |
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Address after: 100085 Huarun Qingcai Street 68, Haidian District, Beijing, two stage, 9 floor, 01 rooms. Patentee after: BEIJING XIAOMI MOBILE SOFTWARE Co.,Ltd. Patentee after: Qingdao Yilai Intelligent Technology Co.,Ltd. Address before: 100085 Huarun Qingcai Street 68, Haidian District, Beijing, two stage, 9 floor, 01 rooms. Patentee before: BEIJING XIAOMI MOBILE SOFTWARE Co.,Ltd. Patentee before: QINGDAO YEELINK INFORMATION TECHNOLOGY Co.,Ltd. |