CN103945621B - A kind of dim signal generation circuit and LED light adjusting circuit - Google Patents
A kind of dim signal generation circuit and LED light adjusting circuit Download PDFInfo
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- CN103945621B CN103945621B CN201410204161.2A CN201410204161A CN103945621B CN 103945621 B CN103945621 B CN 103945621B CN 201410204161 A CN201410204161 A CN 201410204161A CN 103945621 B CN103945621 B CN 103945621B
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Abstract
This application discloses a kind of dim signal generation circuit and LED light adjusting circuit.Described dim signal generation circuit includes start-up circuit, filter circuit and dim signal output circuit, wherein said filter circuit is multi-stage filter circuit, described dim signal output circuit includes: the second comparator, first reference voltage source, second reference voltage source, 3rd comparator, or door and selection logic circuit, described selection logic circuit selects the filtering voltage signal of single-section filter or the dual stage filter matched with described or door output as described light modulation reference signal according to described or door output, namely when needs quickly dim, the filtering voltage signal of single-section filter can be chosen, time constant now is less relative to time constant during steady operation, thus reach the purpose quickly dimmed.
Description
Technical field
The application relates to LED light regulating technology field, more particularly, it relates to a kind of dim signal generation circuit and LED light adjusting circuit.
Background technology
Owing to the application of LED is more and more extensive, the most therefore the requirement of LED light adjusting circuit is improved by user.For LED light adjusting circuit, LED is dimmed by general employing controllable silicon LED light adjusting circuit, in described controllable silicon LED light adjusting circuit, generally when proceeding by light modulation, by the dim signal generation circuit in described controllable silicon LED light adjusting circuit, producing a light modulation reference signal, this light modulation reference signal is as the reference value of the current signal flowing through LED, and then the electric current of regulation LED, to realize light modulation.
Wherein, dim signal generation circuit of the prior art typically uses single-section filter to produce light modulation reference signal, and described single-section filter is made up of a resistance R and an electric capacity C.When the resistance R and electric capacity C of described single-section filter select, the time constant (τ=RC) of this single-section filter is then a steady state value, owing to, in controllable silicon LED light adjusting circuit, the value of timeconstantτ is the least, and the response speed of wave filter is the fastest.If timeconstantτ is relatively big, the response speed of wave filter is slow so that the running and comparing of circuit is stable.Therefore to ensure described controllable silicon LED light adjusting circuit can stable operation, it is bigger that this timeconstantτ would generally be arranged.
When using controllable silicon LED light adjusting circuit of the prior art to dim, when the input signal that dim signal generation circuit receives changes or is disturbed, owing to this filter time constant is constant, then the response speed of wave filter is also constant, the light modulation reference signal that so wave filter produces can not change along with the change of input signal rapidly, causes dimming inaccuracy.
If namely input signal change is fast, and the response speed of wave filter is constant and wait a moment, and causes the generation light modulation reference signal that wave filter can slow, causes light modulation reference signal not respond rapidly to so that LED light adjusting circuit can not accurately dim.
Summary of the invention
In view of this, the application provides a kind of dim signal generation circuit can not quick corresponding problem in order to solve light modulation reference signal of the prior art.
To achieve these goals, it is proposed that scheme as follows:
A kind of dim signal generation circuit, including:
Whether the start-up circuit being connected with angle detection circuitry, control the startup of described dim signal generative circuit for the output signal according to described angle detection circuitry；
The filter circuit being connected with described start-up circuit, for being filtered the output signal of described start-up circuit, wherein said filter circuit is multi-stage filter circuit；
The dim signal output circuit being connected with described filter circuit, is used for judging to select which kind of filter circuit construction to dim reference signal accordingly to generate；
Preferably, in above-mentioned dim signal generation circuit, described filter circuit includes:
One end is connected with the outfan of described start-up circuit, the other end the first filter resistance by the first filter capacitor ground connection；
One end is connected with the common port of described first filter resistance and the first filter capacitor, the other end the second filter resistance by the second filter capacitor ground connection；
Wherein the common port of the first filter resistance and the first filter capacitor is as primary nodal point, and the common port of the second filter resistance and the second filter capacitor is as secondary nodal point；
Preferably, in above-mentioned dim signal generation circuit, described dim signal output circuit includes:
The second comparator that in-phase input end is connected with described primary nodal point；
The 3rd comparator that in-phase input end is connected with described secondary nodal point；
Negative pole is connected with described second comparator in-phase input end, the first reference voltage source that positive pole is connected with described 3rd comparator inverting input；
Negative pole is connected with described 3rd comparator in-phase input end and secondary nodal point, the second reference voltage source that positive pole is connected with described second comparator inverting input；
That be connected with described second comparator and the 3rd comparator output terminal or door；
The selection logic circuit being connected with described or gate output terminal；
Wherein said first reference voltage source is identical with the magnitude of voltage of described second reference voltage source.
Preferably, in above-mentioned dim signal generation circuit, described selection logic circuit specifically for:
When described or door output high level being detected, for selecting the first filtering voltage signal at described primary nodal point as described light modulation reference signal；
When described or door output low level being detected, for selecting the second filtering voltage signal at described secondary nodal point as described light modulation reference signal.
Preferably, in above-mentioned dim signal generation circuit, described filter circuit also includes:
The 3rd switching tube being arranged between described primary nodal point and secondary nodal point.
Preferably, in above-mentioned dim signal generation circuit, the end that controls of described 3rd switching tube is connected with described or door outfan；
When described or door output high level, described 3rd switching tube conducting；
When described or door output low level, described 3rd switching tube cut-off.
Preferably, in above-mentioned dim signal generation circuit, described start-up circuit includes:
The startup voltage source of minus earth；
One end is connected with described startup voltage source positive pole, the other end the first switching tube by second switch pipe ground connection；
Input is connected with the outfan of described angle detection circuitry, outfan controls, with described second switch pipe, the not gate that end is connected；
The end that controls of described first switching tube is connected with the outfan of described angle detection circuitry；
A kind of LED light adjusting circuit, including: dim signal generation circuit disclosed in above-mentioned any one.
Preferably, in above-mentioned LED light adjusting circuit, may include that
The change-over circuit being connected with voltage source, for the input voltage of described voltage source is converted into DC voltage, wherein, described change-over circuit includes: the controllable silicon being connected with voltage source, the electronic transformer being connected with described controllable silicon, the rectifier bridge being connected with described electronic transformer；
The first power stage circuit being connected with described change-over circuit, is used for realizing PFC and producing DC bus-bar voltage；
The second power stage circuit that input is connected with described first power stage circuit, outfan is connected with circuit of LED, for generating the electric current mated with described circuit of LED；
Input is connected with described change-over circuit outfan, outfan controls, with described first power stage circuit, the first drive circuit that end is connected, for producing the first driving signal, to drive described first power stage circuit work；
First input end is connected with described circuit of LED, the second input with in described dim signal generation circuit select logic circuit output end to be connected, the first outfan controls with described second power stage circuit first that end is connected, the second outfan controls the second drive circuit that end is connected with described second power stage circuit second, for producing two driving signal, to drive described second power stage circuit to work；
The described angle detection circuitry that input is connected with the outfan of described change-over circuit, outfan is connected with the control end of the first switching tube of described dim signal generation circuit.
Preferably, in above-mentioned LED light adjusting circuit, described first power stage circuit is Boost translation circuit, and described second power stage circuit is Buck-Boost translation circuit.
Can be seen that from above-mentioned technical scheme, filter circuit in described dim signal generation circuit disclosed in the present application is two stage filter circuit, described selection logic circuit selects the filtering voltage signal of single-section filter or the dual stage filter matched with described or door output as described light modulation reference signal according to described or door output, namely when needs quickly dim, the filtering voltage signal of single-section filter can be chosen, time constant now is less relative to time constant during steady operation, thus reaches the purpose quickly dimmed.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the application, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of a kind of dim signal generation circuit disclosed in the embodiment of the present application；
Fig. 2 is the structure chart of dim signal generation circuit disclosed in another embodiment of the application；
Fig. 3 is the structure chart of dim signal generation circuit disclosed in the another embodiment of the application；
Fig. 4 is the structure chart of LED light adjusting circuit disclosed in the embodiment of the present application；
Fig. 5 is the structure chart of LED light adjusting circuit disclosed in another embodiment of the application；
Fig. 6 is the structure chart of LED light adjusting circuit disclosed in the application another embodiment.
Detailed description of the invention
It is directed to the single-section filter that dim signal generation circuit of the prior art is fixed owing to using time constant, in dimming process, the light modulation reference signal of dim signal generation circuit evolving is difficult to follow the change of input signal in time and change, and cause dimming coarse problem, this application provides a kind of new dim signal generation circuit.
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of the application protection.
Fig. 1 is the schematic diagram of a kind of dim signal generation circuit disclosed in the embodiment of the present application.
Seeing Fig. 1, described dim signal generation circuit is applied in LED light adjusting circuit, and described dim signal generation circuit may include that start-up circuit 1, filter circuit 2 and dim signal output circuit 3；
The concrete structure of described dim signal generation circuit is: described start-up circuit 1 is connected with the angle detection circuitry 0 in LED light adjusting circuit, for the output control signal described dim signal generative circuit of control according to described angle detection circuitry 0 startup whether；
The input of described filter circuit 2 is connected with the outfan of described start-up circuit 1, and described filter circuit 2 is made up of dual stage filter, for being filtered the output signal of described start-up circuit 1, obtains the first filtering voltage signal CF1With the second filtering voltage signal CF2；
The input of described dim signal output circuit 3 is connected with the outfan of described filter circuit 2, for judging that selecting the filter circuit of which kind of structure to generate dims reference signal accordingly；
Wherein, described filter circuit 2 includes: the first wave filter and the second wave filter；
Described first wave filter includes the first filter resistance R of series connection1With the first filter capacitor C1；
Described second wave filter includes the second filter resistance R of series connection2With the second filter capacitor C2；
Wherein, described first filter resistance R1One end be connected with the outfan of described start-up circuit 1, the other end is by the first filter capacitor C1Ground connection；
Described second filter resistance R2One end and described first filter resistance R1With the first filter capacitor C1Common port be connected, the other end is by the second filter capacitor C2Ground connection；
Wherein the first filter resistance R1With the first filter capacitor C1Common port as primary nodal point, the second filter resistance R2With the second filter capacitor C2Common port as secondary nodal point；
Described dim signal output circuit 3 includes: the second comparator A2, the 3rd comparator A3, the first reference voltage source vcref1, the second reference voltage source vcref2, or door and selection logic circuit Selectlogic；
Wherein, the in-phase input end of described second comparator A2 is connected with described primary nodal point；
The in-phase input end of described 3rd comparator A3 is connected with described secondary nodal point；
Described first reference voltage source vcvef1Negative pole be connected with the in-phase input end of described second comparator A2, positive pole is connected with the inverting input of described 3rd comparator A3；
Described second reference voltage source vcvef2Positive pole be connected with the inverting input of described second comparator A2, negative pole is connected with in-phase input end and the secondary nodal point of described 3rd comparator A3；
Two inputs of described or door outfan one_to_one corresponding with described second comparator A2 and the 3rd comparator A3 respectively is connected；
The input of described selection logic circuit Selectlogic is connected with described or door outfan；
Wherein said first reference voltage source vcref1With described second reference voltage source vcref2Magnitude of voltage identical.
When using dim signal generation circuit disclosed in the above embodiments of the present application that LED illuminating circuit is dimmed, after described start-up circuit 1 gets the first comparison signal that described angle detection circuitry 0 sends, when described first comparison signal is high level, described filter circuit 2 is charged by described start-up circuit 1, is now obtained the first filtering voltage signal CF by described primary nodal point1, described secondary nodal point obtain the second filtering voltage signal CF2.Described dim signal output circuit uses described second comparator A2 and described 3rd comparator A3 to the first filtering voltage signal CF1, the second filtering voltage signal CF2The absolute value of difference and the first reference voltage source vcref1(or the second reference voltage source vcref2) compare, and the comparative result of described second comparator A2 and described 3rd comparator A3 is exported to described or door, described or door export the second comparison signal Vcf.As described second comparison signal VcfDuring for high level, described selection logic circuit chooses the first filtering voltage signal CF1Light modulation reference signal Iref as the output of described dim signal generation circuit；As described second comparison signal VcfDuring for low level, choose the second filtering voltage signal CF2Light modulation reference signal Iref as the output of described dim signal generation circuit.Thus realize as described first filtering voltage signal CF1With the second filtering voltage signal CF2The absolute value of difference bigger time, i.e. more than the first reference voltage source Vcref1Time, choose described first filtering voltage signal CF1As light modulation reference signal Iref；As described first filtering voltage signal CF1With the second filtering voltage signal CF2The absolute value of difference less time, i.e. less than the first reference voltage source voltage Vcref1Time, choose described second filtering voltage signal CF2As light modulation reference signal Iref.
Visible, as described second filtering voltage signal CF2During as described light modulation reference signal Iref, filter circuit is dual stage filter, and time constant is big, and light modulation reference signal keeps stable, and LED light adjusting circuit steady operation during being somebody's turn to do can be approximately considered and not dim.As described first filtering voltage signal CF1During as described light modulation reference signal Iref, filter circuit is single-section filter, and time constant is little, therefore can quickly respond the change of input signal.
When angle detection circuitry 0 detects that DC input voitage changes, quickly produce the first comparison signal, dim signal generation circuit receives described first comparison signal, the structure (single stage filtering or two stage filter) of the filter circuit matched with described first comparison signal is chosen according to described first comparison signal, make to dim the change of reference signal response input signal, to realize the purpose of accurately light modulation.
It is understandable that; the structure of described selection logic circuit is varied; as long as so being capable of the output signal according to described or door, the logic circuit that selects of output the first filtering voltage signal or the second filtering voltage signal is selected to belong to the protection domain of the application.
Concrete, the described selection logic circuit in the above embodiments of the present application specifically may be used for:
When described selection logic circuit detects that described or door outfan exports high level, described selection logic circuit selects the first filtering voltage signal at described primary nodal point as described light modulation reference signal；When described selection logic circuit detects the outfan output low level of described or door, described selection logic circuit selects the second filtering voltage signal at described secondary nodal point as described light modulation reference signal.Thus realize under different conditions of demand, exporting different light modulation reference signals, to ensure that described light modulation reference signal can timely respond to.
It is appreciated of course that, user can have different demands to the response speed of described LED light adjusting circuit under different working conditions, therefore to make the LED light adjusting circuit of described dim signal generation circuit disclosed in application the above embodiments of the present application, the demand of different operating situation can be met to greatest extent, user can be according to actual needs to described first filter resistance, second filter resistance, the size of the first filter capacitor and the second filter capacitor is designed, filter time constant τ=RC is made to meet the time constant needed for described LED light adjusting circuit, can realize accurately dimming.
Fig. 2 is the structure chart of dim signal generation circuit disclosed in another embodiment of the application.
See Fig. 2, in order to the simpler loop structure to described filter circuit switches over, between primary nodal point and the secondary nodal point of the described filter circuit in the present embodiment, be also provided with the 3rd switching tube S3, described 3rd switching tube S3The end that controls be connected with described or door outfan, by the output signal described 3rd switching tube S of control of described or door3Break-make, and then control described filter circuit and switch between single-section filter and dual stage filter.Concrete, described 3rd switching tube S3It can be the switching tube of high level conductivity type.When described or door output signal is high level signal, described 3rd switching tube S3Conducting, the structure of described filter circuit is single-section filter structure, the filtering voltage signal CF at the most described primary nodal point1With the filtering voltage signal CF at described secondary nodal point2Equal, at the most described primary nodal point filtering voltage signal CF1As described light modulation reference signal Iref；When described or time door is output as low level, described 3rd switching tube S3Cut-off, described filter circuit is dual stage filter structure, and the filtering voltage signal at described primary nodal point is the first filtering voltage signal CF1, the filtering voltage signal at secondary nodal point is the second filtering voltage signal CF2, the most described second filtering voltage signal CF2As described light modulation reference signal Iref.
Fig. 3 is the structure chart of dim signal generation circuit disclosed in the another embodiment of the application.
It will be appreciated that in order to whether convenient control described dim signal generation circuit works, see Fig. 3, the present embodiment also discloses the start-up circuit in a kind of dim signal generation circuit, and described start-up circuit may include that
The startup voltage source V of minus earthref3, for described filter circuit being charged, to obtain described first filtering voltage signal CF1With described second filtering voltage signal CF2；
One end and described startup voltage source Vref3Positive pole be connected, the other end is by second switch pipe S2First switching tube S of ground connection1；
Input is connected with the outfan of described angle detection circuitry, outfan and described second switch pipe S2Control end be connected not gate；
Described first switching tube S1Control end be connected with the outfan of described angle detection circuitry；
Wherein, described first switching tube S1With second switch pipe S2For controlling the switching tube of conducting when end is high level, when described angle detection circuitry output high level signal, described first switching tube S1Conducting, described second switch pipe S2Disconnect under the effect of described not gate, described startup power supply Vref3Power to described filter circuit.When the output signal of described angle detection circuitry is low level signal, described first switching tube S1Disconnect, described second switch pipe S2Conducting, the output signal of described angle detection circuitry is through described second switch pipe S2It is input to ground.
Certainly, in order to reduce in the above embodiments of the present application, it is also possible to by described second switch pipe S2Control end directly with described first switching tube S1Control end be connected, the most described second switch pipe S2For the switching tube disconnected during high level.
Corresponding to described dim signal generation circuit, disclosed herein as well is a kind of LED light adjusting circuit, described LED light adjusting circuit can include described dim signal generation circuit disclosed in the above-mentioned any one embodiment of the application.
Fig. 4 is the structure chart of LED light adjusting circuit disclosed in the embodiment of the present application.
See Fig. 4, present embodiment discloses the structure chart of a kind of SCR control type LED light adjusting circuit, described LED light adjusting circuit can include change-over circuit the 401, first power stage circuit the 402, second power stage circuit the 403, first drive circuit the 404, second drive circuit 405 and angle detection circuitry 406 and dim signal generation circuit 407；
Concrete, described change-over circuit 401 is connected with voltage source, for the input voltage of described voltage source is converted into DC voltage Vin, wherein, described change-over circuit 401 includes: the controllable silicon 4011 being connected with voltage source, the electronic transformer 4012 being connected with described controllable silicon 4011, the rectifier bridge 4013 being connected with described electronic transformer 4012；
The input of described first power stage circuit 402 is connected with the outfan of described change-over circuit 401, is used for realizing PFC and producing DC bus-bar voltage；
The input of described second power stage circuit 403 is connected with the outfan of described first power stage circuit 402, outfan is connected with the input of circuit of LED LED, for described DC bus-bar voltage is transformed to the voltage mated with described circuit of LED LED；
The input of described first drive circuit 404 is connected with the outfan of described change-over circuit 401, outfan is connected with the control end of described first power stage circuit 402, for producing the first driving signal, to drive described first power stage circuit 402 to work；
The first input end of described second drive circuit 405 is connected with the input of described circuit of LED LED, the second input is connected with the outfan selecting logic circuit in described dim signal generation circuit 407, the first outfan is connected with the first of described second power stage circuit 403 the control end, the second outfan is connected with the second control end of described second power stage circuit 403, drives described second power stage circuit 403 to work for producing two driving signal；
The input of described angle detection circuitry 406 is connected with the outfan of described change-over circuit 401, the first switching tube S in outfan and described dim signal generation circuit 4071Control end be connected.
Fig. 5 is the structure chart of LED light adjusting circuit disclosed in another embodiment of the application.
Seeing Fig. 5, the described angle detection circuitry 406 in above-described embodiment may include that
In-phase input end is connected with described change-over circuit outfan, inverting input and reference voltage Vref4The the first comparator A1 being connected；
The in-phase input end of described first comparator A1 is as the input of described angle detection circuitry 406, and the outfan of described first comparator A1 is as the outfan of described angle detection circuitry 406.
Fig. 6 is the structure chart of LED light adjusting circuit disclosed in the application another embodiment.
Seeing Fig. 6, described first power stage circuit in the present embodiment can be Boost translation circuit, and described second power stage circuit can be Buck-Boost translation circuit；
Wherein said Boost translation circuit includes:
The first inductance L that first end is connected with described change-over circuit outfan1；
Anode and described first inductance L1Second end is connected, negative electrode passes through the first electric capacity Cb1First diode D of ground connection1；
First end and described first inductance L1Second end is connected, the second end ground connection, control the first power tube Q of being connected with described first drive circuit 404 outfan of end1；
Wherein, described first inductance L1The first end as the input of described first power stage circuit 402, described first diode D1Negative electrode as the outfan of described first power stage circuit 402, described first power tube Q1Control end as the control end of described first power stage circuit 402.
Described Buck-Boost translation circuit includes:
First end is connected with described first power stage circuit 402 outfan, controls the second power tube Q that end is connected with described second drive circuit 405 first outfan2；
First end and described second power tube Q2Second end is connected, the second end ground connection, control the 3rd power tube Q that is connected with described second drive circuit 405 second outfan of end3；
First end and described 3rd power tube Q3First end is connected, the second end passes through the second electric capacity Cb2Second inductance L of ground connection2；
Described second power tube Q2Control end as described second power stage circuit 403 first control end；Described 3rd power tube Q3Control end as described second power stage circuit 403 second control end；Described second inductance L2The second end as the outfan of described second power stage circuit 403.
See LED light adjusting circuit disclosed in the above embodiments of the present application, when using LED light adjusting circuit disclosed in the above embodiments of the present application that LED is dimmed, after described start-up circuit gets the first comparison signal that the detection of described angle sends, when described first comparison signal is high level, described filter circuit is charged by described start-up circuit, is now obtained the first filtering voltage signal CF by described primary nodal point1, described secondary nodal point obtain the second filtering voltage signal CF2, described dim signal output circuit uses described second comparator and described 3rd comparator to the first filtering voltage signal CF1, the second filtering voltage signal CF2The absolute value of difference and the first reference voltage source (or second reference voltage source) compare, and the comparative result of described second comparator and described 3rd comparator is exported to described or door, described or door exports the second comparison signal Vcf.As described second comparison signal VcfDuring for high level, described selection logic circuit chooses the first filtering voltage signal CF1Light modulation reference signal Iref as the output of described dim signal generation circuit；As described second comparison signal VcfDuring for low level, choose the second filtering voltage signal CF2Light modulation reference signal Iref as the output of described dim signal generation circuit.Thus realize as described first filtering voltage signal CF1With the second filtering voltage signal CF2The absolute value of difference bigger time, i.e. more than the first reference voltage source voltage Vcref1Time, choose described first filtering voltage signal CF1As light modulation reference signal Iref；As described first filtering voltage signal CF1With the second filtering voltage signal CF2The absolute value of difference less time, i.e. less than the first reference voltage source voltage Vcref1, choose described second filtering voltage signal CF2As light modulation reference signal Iref.
It is visible when described second filtering voltage signal is as described light modulation reference signal, filter circuit is dual stage filter, time constant is big, light modulation reference signal keeps stable, and LED light adjusting circuit steady operation during being somebody's turn to do can be approximately considered and not dim, when using described first filtering voltage signal as described light modulation reference signal, filter circuit is single-section filter, and time constant is little, and described LED light adjusting circuit the most disclosed in the present application can quickly respond the change of input signal.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation or sequentially that there is any this reality between these entities or operation.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application.Multiple amendment to these embodiments will be apparent from for those skilled in the art, and generic principles defined herein can realize in the case of without departing from spirit herein or scope in other embodiments.Therefore, the application is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (9)
1. a dim signal generation circuit, it is characterised in that including:
Whether the start-up circuit being connected with angle detection circuitry, control the startup of described dim signal generative circuit for the output signal according to described angle detection circuitry；
The filter circuit being connected with described start-up circuit, for being filtered the output signal of described start-up circuit, wherein said filter circuit is two stage filter circuit；
The dim signal output circuit being connected with described filter circuit, described dim signal output circuit includes:
In-phase input end is for obtaining the second comparator of the first filtering voltage signal of described two stage filter circuit；
In-phase input end is for obtaining the 3rd comparator of the second filtering voltage signal of described two stage filter circuit；
Negative pole is connected with described second comparator in-phase input end, the first reference voltage source that positive pole is connected with described 3rd comparator inverting input；
Negative pole is connected with described 3rd comparator in-phase input end, the second reference voltage source that positive pole is connected with described second comparator inverting input；
That be connected with described second comparator and the 3rd comparator output terminal or door；
The selection logic circuit being connected with described or gate output terminal；
Wherein said first reference voltage source is identical with the magnitude of voltage of described second reference voltage source；
Described dim signal output circuit, when being used for detecting described or door output high level, for selecting the first filtering voltage signal as described light modulation reference signal；When described or door output low level being detected, for selecting the second filtering voltage signal as described light modulation reference signal.
Dim signal generation circuit the most according to claim 1, it is characterised in that described filter circuit includes:
One end is connected with the outfan of described start-up circuit, the other end the first filter resistance by the first filter capacitor ground connection；
One end is connected with the common port of described first filter resistance and the first filter capacitor, the other end the second filter resistance by the second filter capacitor ground connection；
The common port of wherein said first filter resistance and the first filter capacitor is as primary nodal point, and the common port of described second filter resistance and the second filter capacitor is as secondary nodal point.
Dim signal generation circuit the most according to claim 2, it is characterised in that described selection logic circuit specifically for:
When described or door output high level being detected, for selecting the first filtering voltage signal at described primary nodal point as described light modulation reference signal；
When described or door output low level being detected, for selecting the second filtering voltage signal at described secondary nodal point as described light modulation reference signal.
Dim signal generation circuit the most according to claim 2, it is characterised in that filter circuit also includes:
The 3rd switching tube being arranged between described primary nodal point and secondary nodal point.
Dim signal generation circuit the most according to claim 4, it is characterised in that the end that controls of described 3rd switching tube is connected with described or door outfan；
When described or door output high level, described 3rd switching tube conducting；
When described or door output low level, described 3rd switching tube cut-off.
Dim signal generation circuit the most according to claim 1, it is characterised in that described start-up circuit includes:
The startup voltage source of minus earth；
One end is connected with described startup voltage source positive pole, the other end the first switching tube by second switch pipe ground connection；
Input is connected with the outfan of described angle detection circuitry, outfan controls, with described second switch pipe, the not gate that end is connected；
The end that controls of described first switching tube is connected with the outfan of described angle detection circuitry.
7. a LED light adjusting circuit, it is characterised in that including: dim signal generation circuit disclosed in claim 1-6 any one.
LED light adjusting circuit the most according to claim 7, it is characterised in that including:
The change-over circuit being connected with voltage source, for the input voltage of described voltage source is converted into DC voltage, wherein, described change-over circuit includes: the controllable silicon being connected with described voltage source, the electronic transformer being connected with described controllable silicon, the rectifier bridge being connected with described electronic transformer；
The first power stage circuit being connected with described change-over circuit outfan, is used for realizing PFC and producing DC bus-bar voltage；
The second power stage circuit that input is connected with described first power stage circuit outfan, outfan is connected with circuit of LED, for generating the electric current mated with described circuit of LED；
Input is connected with described change-over circuit outfan, outfan controls, with described first power stage circuit, the first drive circuit that end is connected, for producing the first driving signal, to drive described first power stage circuit work；
First input end is connected with described circuit of LED, the second input with in described dim signal generation circuit select logic circuit output end to be connected, the first outfan controls with described second power stage circuit first that end is connected, the second outfan controls, with described second power stage circuit second, the second drive circuit that end is connected, for producing two driving signal, to drive described second power stage circuit work；
Input is connected with described change-over circuit outfan, outfan controls, with the first switching tube in described dim signal generation circuit, the angle detection circuitry that end is connected.
LED light adjusting circuit the most according to claim 8, it is characterised in that described first power stage circuit is Boost translation circuit, described second power stage circuit is Buck-Boost translation circuit.
Priority Applications (1)
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