CN103687154A - Phase-cut dimming control circuit and lighting control device - Google Patents
Phase-cut dimming control circuit and lighting control device Download PDFInfo
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- CN103687154A CN103687154A CN201210353365.3A CN201210353365A CN103687154A CN 103687154 A CN103687154 A CN 103687154A CN 201210353365 A CN201210353365 A CN 201210353365A CN 103687154 A CN103687154 A CN 103687154A
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Abstract
The invention relates to a phase-cut dimming control circuit and a lighting control device. The lighting control device comprises a rectifying unit, a damping circuit, a conversion unit and a phase-cut dimming control circuit. The rectifying unit can be used to perform rectification on an input voltage to obtain a rectified voltage. The damping circuit can be used to attenuate the oscillation of a current following through a dimmer. The conversion unit can be used to convert the rectified voltage into a control signal to control the light emitting of a light-emitting diode. The phase-cut dimming control circuit can be used to make the damping circuit stop operating when the input voltage is a non-phase-cut voltage and make the damping circuit operate when the input voltage is a phase-cut voltage. Specifically, the phase-cut dimming control circuit may comprise a detection unit, a switching control unit and a switching unit. The detection unit can be used to detect the rectified voltage to acquire a detection signal indicating whether the input voltage is the non-phase-cut voltage or the phase-cut voltage. The switching control unit can be used to output a switching signal based on the detection signal. The switching unit can be used to make the damping circuit operate or stop operating based on the switching signal.
Description
Technical field
The disclosure relates to the technical field of illumination control apparatus, relates to particularly a kind of phase-cut dimming control circuit and the illumination control apparatus with this phase-cut dimming control circuit.
Background technology
This part provides the background information relevant with the disclosure, and this is prior art not necessarily.
The illumination control apparatus with phase-cut dimming function is provided with antihunt circuit conventionally.When dimmer is access in, can the decay vibration of in dimmer mobile electric current of antihunt circuit, to prevent the silicon controlled abnormal shutdown in dimmer, thereby realizes better dimming behavior.Yet antihunt circuit can consumed energy.When dimmer is not access in, antihunt circuit no longer works to dimmer, but can continue consumed energy, thereby causes energy dissipation.
Summary of the invention
This part provides general summary of the present disclosure, rather than the full disclosure of its four corner or its whole features.
Object of the present disclosure is to provide a kind of phase-cut dimming control circuit and illumination control apparatus, whether it can identify dimmer and be access in, when being access in, dimmer makes antihunt circuit work, and when dimmer is not access in, make antihunt circuit quit work, thereby when obtaining good dimming behavior, realize energy-conservation.
A kind of illumination control apparatus can comprise rectification unit, antihunt circuit, converting unit and phase-cut dimming control circuit.Rectification unit can carry out rectification to obtain commutating voltage to input voltage.Can the decay vibration of in dimmer mobile electric current of antihunt circuit.Converting unit can convert commutating voltage to control signal to control the luminous of light-emitting diode.Phase-cut dimming control circuit can be worked as when input voltage is non-cut voltage quits work antihunt circuit, and makes antihunt circuit work when input voltage is cut voltage.Particularly, phase-cut dimming control circuit can comprise detecting unit, switch control unit and switch unit.It is non-cut voltage or the detection signal of cut voltage to obtain indication input voltage that detecting unit can detect commutating voltage.Switch control unit can be based on detection signal output switching signal.Switch unit can make antihunt circuit work or quit work based on switching signal.
The input voltage that a kind of phase-cut dimming control circuit of illumination control apparatus can be worked as illumination control apparatus quits work the antihunt circuit in illumination control apparatus while being non-cut voltage, and makes antihunt circuit work when input voltage is cut voltage.Particularly, phase-cut dimming control circuit can comprise detecting unit, switch control unit and switch unit.The commutating voltage that detecting unit can detect the rectification unit generation in illumination control apparatus is non-cut voltage or the detection signal of cut voltage to obtain indication input voltage.Switch control unit can be based on detection signal output switching signal.Switch unit can make antihunt circuit work or quit work based on switching signal.
Whether according to phase-cut dimming control circuit of the present disclosure and illumination control apparatus, can identify dimmer is access in.When dimmer is access in, make antihunt circuit work, and when dimmer is not access in, make antihunt circuit quit work.Therefore, illumination control apparatus can be realized energy-conservation, does not affect dimming behavior simultaneously.
From the description providing at this, further applicability region will become obvious.Description in this summary and specific examples be the object in order to illustrate just, and is not intended to limit the scope of the present disclosure.
Accompanying drawing explanation
Accompanying drawing described here is for the object of the signal of selected embodiment but not all possible enforcement, and is not intended to limit the scope of the present disclosure.In the accompanying drawings:
Fig. 1 is the circuit structure diagram of a kind of illumination control apparatus known for inventor of the present disclosure;
Fig. 2 is according to the block diagram of the schematic construction of the illumination control apparatus of disclosure embodiment;
Fig. 3 is according to the circuit structure diagram of the illumination control apparatus of disclosure embodiment;
Fig. 4 is that the illumination control apparatus shown in Fig. 3 is at the schematic diagram of front cutting in light modulation situation; And
Fig. 5 be the illumination control apparatus shown in Fig. 3 after cut the schematic diagram in light modulation situation.
Although the disclosure easily stands various modifications and replacement form, its specific embodiment is shown in the drawings as an example, and in this detailed description.Yet should be understood that, at this, description of specific embodiment is not intended the disclosure to be restricted to disclosed concrete form, but on the contrary, disclosure object is will cover all modifications, the equivalence dropping within spirit and scope of the present disclosure and replace.Be noted that and run through several accompanying drawings, corresponding label is indicated corresponding parts.
Embodiment
With reference now to accompanying drawing, example of the present disclosure is described more fully.It is in fact exemplary below describing, and is not intended to limit the disclosure, application or purposes.
Example embodiment is provided, detailed so that the disclosure will become, and will pass on fully its scope to those skilled in the art.Set forth numerous specific detail as the example of specific features, apparatus and method, so that the detailed understanding to embodiment of the present disclosure to be provided.Will be apparent that to those skilled in the art, not need to use specific details, example embodiment can be implemented by many different forms, and they should not be interpreted as limiting the scope of the present disclosure.In some example embodiment, do not describe well-known process, well-known structure and well-known technology in detail.
When element or layer be called as " in " another element or layer " on ", when " joining to ", " being connected to " or " being coupled to " another element or layer, it can be directly on another element or layer, join, be connected to or be coupled to another element or layer to, or can there is element or layer between two parties.Form therewith contrast, when element be called as " directly in " another element or layer " on ", when " directly joining to ", " being directly connected to " or " being directly coupled to " another element or layer, may not there is not element or layer between two parties.For describing other wording of relation between element, should understand in a similar fashion (such as " between " in contrast to " directly between ", " adjacent " and in contrast to " direct neighbor " etc.).As used herein, term "and/or" comprises the one or more any and whole combination in relevant listed items.
Although term first, second, third, etc. can be used to describe various elements, parts, region, layer and/or section at this, these elements, parts, region, layer and/or section should not be subject to these term restrictions.These terms can only be used for element, parts, region, layer or a section and other region, layer or section to distinguish.Term such as " first ", " second " and other digital term are when not imply sequence or order when this uses, unless context is clearly indicated.Therefore, the first element discussed below, parts, region, layer or section also can be expressed as the second element, parts, region, layer or section, and can not deviate from the instruction of example embodiment.
As shown in Figure 1, a kind of illumination control apparatus 100 known for inventor of the present disclosure can comprise rectification unit 120, leadage circuit 130, antihunt circuit 140 and pulse-width modulation (PWM) transducer 150.Be noted that not necessarily prior art of the illumination control apparatus 100 here.
Dimmer 110 is arranged on the power input of illumination control apparatus 100, is arranged on particularly on live wire, for supply voltage that is non-cut voltage are carried out to cut to obtain cut voltage.The dimmer 110 here refers to phase-cut dimming device.Phase-cut dimming device before generally can being divided into, cut dimmer and after cut dimmer.Before cut dimmer the previous section of the half-wave of non-cut voltage cut away, and only with the aft section of half-wave, provide energy.After cut dimmer the aft section of the half-wave of non-cut voltage cut away, and only with the previous section of half-wave, provide energy.
When needs are carried out dimming function, can be by dimmer 110 accesses, to become cut voltage as input voltage the cut of non-cut voltage.On the other hand, when not needing light modulation, can dimmer 110 not accessed, thereby directly non-cut voltage is supplied to illumination control apparatus 100 as input voltage.
The signal of 120 pairs of inputs of rectification unit carries out rectification.When dimmer 110 is not access in, rectification unit 120 directly carries out rectification to obtain commutating voltage to non-cut voltage.When dimmer 110 is access in, 120 pairs of cut voltages of rectification unit carry out rectification to obtain commutating voltage.
In the rectification unit 120 shown in Fig. 1, four diode D2, D3, D4 and D5 form rectifier bridges, at the input of the rectifier bridge capacitor C7 that has been connected in parallel, and at the output of the rectifier bridge capacitor C1 that has been connected in parallel.Such structure is significantly to those skilled in the art, repeats no more here.
Leadage circuit 130 is connected in the output of rectification unit 120 in parallel, for releasing at the mobile electric current of dimmer 110.In dimmer 110, operated by rotary motion has capacitor.At each supply voltage, in the cycle, the residual charge in capacitor can affect the waveform of the cut voltage of dimmer 110 outputs, is therefore necessary to carry out and releases.At the leadage circuit 130 shown in Fig. 1, comprise the MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor that plays on-off action, Metal-oxide-semicondutor-field-effect transistor) device Q2 and drain resistor R10.When MOSFET device Q2 receives when releasing signal and connecting, drain resistor R10 conducting, thus release mobile electric current in dimmer 110.When MOSFET device Q2 disconnects, leakage current stops.In addition, in the leadage circuit 130 shown in Fig. 1, diode D1 is connected between the grid and ground connection of MOSFET device Q2, plays a protective role.
Antihunt circuit 140 is connected in the output of rectification unit 120 in parallel, for decaying in the vibration of the mobile electric current of dimmer 110.Antihunt circuit 140 can prevent that current oscillation in the controllable silicon in dimmer 110 from, to maintaining below electric current, causing abnormal shutdown.In the antihunt circuit 140 shown in Fig. 1, comprise capacitor C4 and the resistor R8 being connected in series.
PWM transducer 150 is connected to the output of rectification unit 120, for commutating voltage being converted to control signal for example to control LED(Light Emitting Diode, light-emitting diode) luminous.For commutating voltage being converted to the structure of the PWM transducer 150 of control signal, be significantly to those skilled in the art, repeat no more here.
As mentioned above, antihunt circuit 140 is connected in the output of rectification unit 120 in parallel, so that the vibration of decay mobile electric current in dimmer 110.In attenuated oscillation, antihunt circuit 140 also can consumed energy.When dimmer 110 is access in, antihunt circuit 140 consumed energies are necessary.Yet, when dimmer 110 is not access in, because antihunt circuit 140 is connected in the output of rectification unit 120 in parallel, so antihunt circuit 140 still can consumed energy.Now, this energy consumption becomes and there is no need, and has caused energy dissipation.
As shown in Figure 2, according to the illumination control apparatus 200 of a specific embodiment of the present disclosure, can comprise rectification unit 220, antihunt circuit 260, converting unit 230 and phase-cut dimming control circuit 240.Rectification unit 220 can carry out rectification to obtain commutating voltage to input voltage.Can the decay vibration of in dimmer 210 mobile electric current of antihunt circuit 260.Converting unit 230 can convert commutating voltage to control signal to control the luminous of light-emitting diode.Phase-cut dimming control circuit 240 can be worked as when input voltage is non-cut voltage quits work antihunt circuit 260, and when input voltage is cut voltage, makes antihunt circuit 260 work.Particularly, phase-cut dimming control circuit 240 can comprise detecting unit 241, switch control unit 242 and switch unit 243.It is non-cut voltage or the detection signal of cut voltage to obtain indication input voltage that detecting unit 241 can detect commutating voltage.Switch control unit 242 can be based on detection signal output switching signal.Switch unit 243 can make antihunt circuit 260 work or quit work based on switching signal.
In illumination control apparatus 200 as shown in Figure 2, be provided with phase-cut dimming control circuit 240.When dimmer 210 is access in, dimmer 210 can carry out cut to non-cut voltage usings acquisition cut voltage as input voltage.Now, phase-cut dimming control circuit 240 can make antihunt circuit 260 work, thereby makes antihunt circuit 260 proper function.When dimmer 210 is not access in, non-cut voltage is directly input into as input voltage.Now, phase-cut dimming control circuit 240 can make antihunt circuit 260 quit work, to make not consumed energy of antihunt circuit 260, thereby realizes energy-conservation.
When dimmer 210 is not access in, rectification unit 220 directly carries out rectification to obtain commutating voltage to non-cut voltage.When dimmer 210 is access in, 220 pairs of cut voltages of rectification unit carry out rectification to obtain commutating voltage.Therefore,, by detecting commutating voltage, can identify non-cut voltage or cut voltage is carried out to rectification.When identification is, when non-cut voltage is carried out to rectification, can determine that dimmer 210 is not access in.On the other hand, when identification is when cut voltage is carried out to rectification, can determine that dimmer 210 is access in.
Fig. 3 shows the circuit structure diagram of illumination control apparatus 200.As seen from Figure 3, the circuit structure diagram of the illumination control apparatus 100 of the circuit structure diagram of illumination control apparatus 200 based on shown in Fig. 1.Those skilled in the art can will be appreciated that, the circuit structure diagram of illumination control apparatus 200 also can have other form, and the disclosure does not have particular restriction to this.
In Fig. 3, rectification unit 220 in illumination control apparatus 200 and correspond respectively to rectification unit 120 and the PWM transducer 150 in the illumination control apparatus 100 shown in Fig. 1 in annexation and configuration aspects as the PWM transducer 230 of converting unit, does not repeat them here.In addition, it should be noted that, PWM transducer is a part for LED drive circuit, can be referred to as LED and drive transducer.It can comprise that PWM driving, constant current driving and constant voltage drive three types.The disclosure does not have particular restriction equally to this.
Figure 3 illustrates detecting unit 241, switch control unit 242 and switch unit 243 that phase-cut dimming control circuit 240 comprises.
Switch control unit 242 can comprise integrating circuit and voltage control circuit.Integrating circuit can output switching signal, to control switch unit 243, makes antihunt circuit 260 work or quits work.The detection signal that voltage control circuit can obtain based on detecting unit 241 is controlled the input voltage of integrating circuit, so that integrating circuit output switching signal.
Particularly, as shown in Figure 3, integrating circuit can comprise operational amplifier X1 and integrating condenser C3.The positive input terminal of operational amplifier X1 is connected to reference voltage Vref (for example can be set to 2.5V), and output output switching signal.Integrating condenser C3 is connected between the negative input end and output of operational amplifier X1.
Further, voltage control circuit can comprise control resistor R7 and the control capacitor C2 being connected in series.One end of control resistor R7 is connected to supply voltage VCC, and the other end is connected to one end of control capacitor C2.The other end ground connection of control capacitor C2.Node between control resistor R7 and control capacitor C2 is connected to the negative input end of operational amplifier X1.
The detection signal obtaining based on detecting unit 241, can carry out electric discharge to control capacitor C2, thereby affects the voltage of the negative input end of operational amplifier X1.The comparison of the positive input terminal based on operational amplifier X1 and the voltage of negative input end, operational amplifier X1 can output switching signal.
As mentioned above, dimmer 210 before can being divided into, cut dimmer and after cut dimmer.Correspondingly, cut voltage can comprise forward position cut voltage and rear along cut voltage.When dimmer 210 is, while front cutting dimmer, to produce forward position cut voltage.Characteristic based on forward position cut voltage, detecting unit 241 can comprise high fdrequency component extraction circuit and discharge circuit.High fdrequency component is extracted circuit can extract high fdrequency component as detection signal from the commutating voltage of rectification unit 220 acquisitions.Discharge circuit can, when detection signal indicates input voltage to be forward position cut voltage, make the control capacitor C2 electric discharge in the voltage control circuit in switch control unit 242.
Particularly, as shown in Figure 3, high fdrequency component is extracted circuit and can be connected in parallel with rectification unit 220, and can comprise the extraction capacitor C5 being connected in series and extract resistor R2 and R3.
Further, discharge circuit can comprise discharge diode Q1.The collector electrode of discharge diode Q1 is connected to control resistor R7 in voltage control circuit and the node between control capacitor C2, grounded emitter, and base stage is connected to the node extracting between resistor R2 and R3.
Current when cutting dimmer 210 and being access in, discharge diode Q1 will conducting, causes control capacitor C2 electric discharge.So, the voltage of the negative input end of operational amplifier X1 will be lower than the reference voltage Vref of positive input terminal, thereby the switching signal of output high level makes switch unit 243 connect antihunt circuits 260 and makes antihunt circuit 260 work.
On the other hand, current when cutting dimmer 210 and not being access in, discharge diode Q1 will end, thereby control capacitor C2 is not discharged.So, the voltage of the negative input end of operational amplifier X1 will be higher than the reference voltage Vref of positive input terminal, thereby the switching signal of output low level makes switch unit 243 disconnect antihunt circuits 260 and antihunt circuit 260 is quit work.
Form therewith contrast, while cutting dimmer after dimmer 210 is, after generation along cut voltage.Based on the rear characteristic along cut voltage, detecting unit 241 can comprise bleeder circuit and discharge circuit.The commutating voltage that bleeder circuit can obtain rectification unit 220 carries out dividing potential drop, usings and obtains voltage division signal as detection signal.Discharge circuit can be after detection signal indicates input voltage to be during along cut voltage, makes the control capacitor C2 electric discharge in the voltage control circuit in switch control unit 242.
Particularly, as shown in Figure 3, bleeder circuit can be connected in parallel with rectification unit 220, and can comprise voltage grading resistor R4 and the R6 being connected in series.
Further, discharge circuit can comprise discharge diode D7.The anodic bonding of discharge diode D7 is to the control resistor R7 in voltage control circuit and the node between control capacitor C2, and negative electrode is connected to the node between voltage grading resistor R4 and R6.
When after when cutting dimmer 210 and being access in, discharge diode D7 will make control capacitor C2 electric discharge.So, the voltage of the negative input end of operational amplifier X1 will be lower than the reference voltage Vref of positive input terminal, thereby the switching signal of output high level makes switch unit 243 connect antihunt circuits 260 and makes antihunt circuit 260 work.
On the other hand, when after when cutting dimmer 210 and not being access in, discharge diode D7 can not make control capacitor C2 electric discharge.So, the voltage of the negative input end of operational amplifier X1 will be higher than the reference voltage Vref of positive input terminal, thereby the switching signal of output low level makes switch unit 243 disconnect antihunt circuits 260 and antihunt circuit 260 is quit work.
As can see from Figure 3, for the high fdrequency component of front cutting dimmer extract circuit and discharge circuit and for after cut dimmer bleeder circuit and discharge circuit be all included in detecting unit 241.So, no matter dimmer 210 before being, cut dimmer or after cut dimmer, whether detecting unit 241 all can detect dimmer 210 and be access in.Certainly, if can determine before 210 of the dimmers of access may be and cut dimmer, can from the circuit structure diagram shown in Fig. 3, remove for after cut bleeder circuit and the discharge circuit of dimmer, that is remove voltage grading resistor R4 and R6 and discharge diode D7.On the other hand, if can determine after 210 of the dimmers of access may be and cut dimmer, can from the circuit structure diagram shown in Fig. 3, remove for the high fdrequency component of front cutting dimmer and extract circuit and discharge circuit, that is remove and extract capacitor C5, extraction resistor R2 and R3 and discharge diode Q1.
Figure 3 illustrates antihunt circuit 260.Antihunt circuit 260 is connected in parallel with rectification unit 220, and comprises damped resistor R8 and the damped capacitor C4 being connected in series.
According to embodiment of the present disclosure, antihunt circuit 260 switch on and off the control that is subject to switch unit 243.Switch unit 243 shown in Fig. 3 comprises MOSFET device Q3, and this MOSFET device Q3 plays the effect of switch.
As shown in Figure 3, the drain electrode of MOSFET device Q3 is connected to damped capacitor C4, source ground, and the switching signal exported by switch control unit 242 of grid is controlled (that is be connected to operational amplifier X1 output).
When dimmer 210 is access in, switching signal is high level, thereby the Q3 conducting of MOSFET device and antihunt circuit 260 are connected.On the other hand, when dimmer 210 is not access in, switching signal is low level, thereby MOSFET device Q3 cut-off and antihunt circuit 260 disconnect.
Figure 3 illustrates leadage circuit 250.Leadage circuit 250 is for releasing at the mobile electric current of dimmer 210.Be similar to antihunt circuit 260, the leadage circuit 250 being connected in circuit structure also can consumed energy.When dimmer 210 is access in, leadage circuit 250 consumed energies are necessary.Yet when dimmer 210 is not access in, this energy consumption becomes and there is no need, and has caused energy dissipation.
According to preferred embodiment of the present disclosure, when dimmer 210 is not access in, phase-cut dimming control circuit 240 can make leadage circuit 250 quit work, and when dimmer 210 is access in, phase-cut dimming control circuit 240 can make leadage circuit 250 normally work.So just can realize further energy-conservation.
Particularly, as shown in Figure 3, leadage circuit 250 can comprise MOSFET device Q2, drain resistor R5, protection diode D1 and hold-off diode D6.
The drain electrode of MOSFET device Q2 is connected to damped resistor R8 in antihunt circuit 260 and the node between damped capacitor C4, and source electrode is connected to one end of drain resistor R5, and grid is by the signal controlling of releasing.The other end ground connection of drain resistor R5.The negative electrode of protection diode D1 is connected to the grid of MOSFET device Q2, and plus earth.The anodic bonding of hold-off diode D6 is to the grid of MOSFET device Q2, and the switching signal that negative electrode is exported by switch control unit 242 is controlled (that is be connected to operational amplifier X1 output).
When dimmer 210 is access in, switching signal is high level, thereby hold-off diode D6 cut-off does not affect leadage circuit 250 and normally works.On the other hand, when dimmer 210 is not access in, switching signal is low level, thus hold-off diode D6 conducting.So, the signal of releasing can pass hold-off diode D6, and no longer the grid of MOSFET device Q2 is played to control action.Therefore, leadage circuit 250 quits work, thereby realizes further energy-conservation.
Next with further reference to Fig. 4 and Fig. 5, embodiment of the present disclosure is described.Fig. 4 shows the illumination control apparatus 200 shown in Fig. 3 at the schematic diagram of front cutting in light modulation situation, Fig. 5 show the illumination control apparatus 200 shown in Fig. 3 after cut the schematic diagram in light modulation situation.
As shown in Figure 4, dimmer 210 is for front cutting dimmer.Before cut dimmer 210 and time the previous section of the half-wave of non-cut voltage cut away in work, and only with the aft section of half-wave, provide energy.
In the situation that front cutting dimmer 210 and being access in, the front 210 pairs of non-cut voltages of dimmer of cutting carry out cut to obtain forward position cut voltage.220 pairs of forward position cut voltages of rectification unit carry out rectification, to obtain commutating voltage.Comprise that the high fdrequency component extraction circuit in the extraction capacitor C5 being connected in series and the detecting unit 241 that extracts resistor R2 and R3 can extract the high fdrequency component in commutating voltage.High fdrequency component can be from extracting the Node extraction between resistor R2 and R3, and be indicated as V_L.High fdrequency component V_L is supplied to the discharge circuit in detecting unit 241, that is is supplied to the base stage of discharge diode Q1, as shown in the curve arrow in Fig. 4.
Current when cutting dimmer 210 and being access in, the voltage of high fdrequency component V_L is enough to make discharge diode Q1 conducting.Due to discharge diode Q1 conducting, the electric charge of the upper accumulation of control capacitor C2 in the voltage control circuit in switch control unit 242 can discharge by discharge diode Q1, as shown in discharge diode Q1 and the arrow between control capacitor C2 in Fig. 4.
So, the voltage drop of the negative input end of the operational amplifier X1 in the integrating circuit in switch control unit 242.When the voltage of the negative input end of operational amplifier X1 is during lower than the reference voltage Vref of positive input terminal, operational amplifier X1 can accumulate positive output voltage, and finally reaches maximum, that is output high level is as switching signal.
The switching signal of high level is supplied to the switch unit 243 in phase-cut dimming control circuit 240, that is is supplied to the grid of MOSFET device Q3.So, MOSFET device Q3 conducting, thus connected antihunt circuit 260.Therefore antihunt circuit 260 vibration of in dimmer 210 mobile electric current of can normally working to decay.
Further, the switching signal of high level is also supplied to the negative electrode of the hold-off diode D6 in leadage circuit 250, causes hold-off diode D6 cut-off.So, the signal of releasing just can normally be controlled the grid of MOSFET device Q2, makes the leadage circuit 250 mobile electric current in dimmer 210 of can normally working to release.
On the other hand, current when cutting dimmer 210 and not being access in, the undertension of high fdrequency component V_L is so that discharge diode Q1 conducting.So, the electric charge of the upper accumulation of control capacitor C2 just cannot discharge by discharge diode Q1, thereby the voltage of the negative input end of operational amplifier X1 can not decline.As a result, operational amplifier X1 output low level is as switching signal.When low level switching signal is supplied to the grid of MOSFET device Q3, MOSFET device Q3 cut-off, thus make antihunt circuit 260 quit work to realize energy-conservation.
Further, low level switching signal is also supplied to the negative electrode of hold-off diode D6, causes hold-off diode D6 conducting.So, the signal of releasing just passes hold-off diode D6, and no longer the grid of MOSFET device Q2 is played to control action.Therefore, leadage circuit 250 quits work, thereby realizes further energy-conservation.
As shown in Figure 5, dimmer 210 is cut dimmer after being.After cut dimmer 210 and time the aft section of the half-wave of non-cut voltage cut away in work, and only with the previous section of half-wave, provide energy.
After cut dimmer 210 and be access in the situation that, after cut 210 pairs of supply voltages of dimmer carry out cut with after obtaining along cut voltage.After 220 pairs of rectification units, along cut voltage, carry out rectification, to obtain commutating voltage.Comprise that the bleeder circuit in the detecting unit 241 of the voltage grading resistor R4 that is connected in series and R6 can carry out dividing potential drop to commutating voltage, usings and obtains voltage division signal as detection signal.Voltage division signal can be from the Node extraction between voltage grading resistor R4 and R6, and is indicated as V_T.Voltage division signal V_T is supplied to the discharge circuit in detecting unit 241, that is is supplied to the negative electrode of discharge diode D7.
When after when cutting dimmer 210 and being access in, voltage division signal V_T can make discharge diode D7 conducting, the electric charge of the upper accumulation of control capacitor C2 in the voltage control circuit in switch control unit 242 can be discharged by discharge diode D7 and voltage grading resistor R6, as shown in the curve arrow in Fig. 5.
So, the voltage drop of the negative input end of the operational amplifier X1 in the integrating circuit in switch control unit 242.When the voltage of the negative input end of operational amplifier X1 is during lower than the reference voltage Vref of positive input terminal, operational amplifier X1 can accumulate positive output voltage, and finally reaches maximum, that is output high level is as switching signal.
The switching signal of high level is supplied to the switch unit 243 in phase-cut dimming control circuit 240, that is is supplied to the grid of MOSFET device Q3.So, MOSFET device Q3 conducting, thus connected antihunt circuit 260.Therefore antihunt circuit 260 vibration of in dimmer 210 mobile electric current of can normally working to decay.
Further, the switching signal of high level is also supplied to the negative electrode of the hold-off diode D6 in leadage circuit 250, causes hold-off diode D6 cut-off.So, the signal of releasing just can normally be controlled the grid of MOSFET device Q2, makes the leadage circuit 250 mobile electric current in dimmer 210 of can normally working to release.
On the other hand, when after when cutting dimmer 210 and not being access in, voltage division signal V T is not enough to cause the voltage of negative input end of operational amplifier X1 lower than the reference voltage Vref of positive input terminal.As a result, operational amplifier X1 output low level is as switching signal.When low level switching signal is supplied to the grid of MOSFET device Q3, MOSFET device Q3 cut-off, thus make antihunt circuit 260 quit work to realize energy-conservation.
Further, low level switching signal is also supplied to the negative electrode of hold-off diode D6, causes hold-off diode D6 conducting.So, the signal of releasing just passes hold-off diode D6, and no longer the grid of MOSFET device Q2 is played to control action.Therefore, leadage circuit 250 quits work, thereby realizes further energy-conservation.
Above disclosed specific embodiment be only schematically because the disclosure can be with mode correct and practice different but equivalence, these modes are obvious for obtaining those skilled in the art of the benefit of instruction herein.And then, except in claims, describe those, do not intend to be limited in the details of the structure shown in this or design.Therefore, be apparent that, can change or revise disclosed specific embodiment above, and within all such variations are all considered to be in the scope of the present disclosure and spirit.
Claims (19)
1. an illumination control apparatus, comprising:
Rectification unit, for carrying out rectification to obtain commutating voltage to input voltage;
Antihunt circuit, for decaying in the vibration of the mobile electric current of dimmer;
Converting unit, for converting described commutating voltage to control signal to control the luminous of light-emitting diode; And
Phase-cut dimming control circuit for making described antihunt circuit quit work when described input voltage is non-cut voltage, and makes described antihunt circuit work when described input voltage is cut voltage,
Wherein, described phase-cut dimming control circuit comprises:
Detecting unit is non-cut voltage or the detection signal of cut voltage for detection of described commutating voltage to obtain the described input voltage of indication;
Switch control unit, for based on described detection signal output switching signal; And
Switch unit, for making described antihunt circuit work or quitting work based on described switching signal.
2. illumination control apparatus according to claim 1, wherein, described switch control unit comprises:
Integrating circuit, for exporting described switching signal; And
Voltage control circuit, for controlling the input voltage of described integrating circuit based on described detection signal.
3. illumination control apparatus according to claim 2, wherein, described integrating circuit comprises operational amplifier and integrating condenser, the positive input terminal of described operational amplifier is connected to reference voltage, the output of described operational amplifier is exported described switching signal, and described integrating condenser is connected between the negative input end and output of described operational amplifier, and
Described voltage control circuit comprises control resistor and the control capacitor being connected in series, one end of described control resistor is connected to supply voltage, the other end of described control resistor is connected to one end of described control capacitor, the other end ground connection of described control capacitor, and the node between described control resistor and described control capacitor is connected to the negative input end of described operational amplifier.
4. illumination control apparatus according to claim 3, wherein, described cut voltage comprises forward position cut voltage, and described detecting unit comprises:
High fdrequency component is extracted circuit, for extracting high fdrequency component as described detection signal from described commutating voltage; And
The first discharge circuit, when indicating described input voltage to be described forward position cut voltage when described detection signal, makes the described control capacitor electric discharge in the described voltage control circuit in described switch control unit.
5. illumination control apparatus according to claim 4, wherein, described high fdrequency component is extracted circuit and is connected in parallel with described rectification unit, and comprises that the extraction capacitor, first being connected in series extracts resistor and the second extraction resistor, and
Described the first discharge circuit comprises discharge diode, the collector electrode of described discharge diode is connected to described control resistor in described voltage control circuit and the node between described control capacitor, the grounded emitter of described discharge diode, and the base stage of described discharge diode is connected to the described first node extracting between resistor and described the second extraction resistor.
6. according to the illumination control apparatus described in any one in claim 3 to 5, wherein, described cut voltage comprises rear along cut voltage, and described detecting unit comprises:
Bleeder circuit, obtains voltage division signal as described detection signal for described commutating voltage being carried out to dividing potential drop, usining; And
The second discharge circuit, is described rear during along cut voltage for indicate described input voltage when described detection signal, makes the described control capacitor electric discharge in the described voltage control circuit in described switch control unit.
7. illumination control apparatus according to claim 6, wherein, described bleeder circuit and described rectification unit are connected in parallel, and comprise the first voltage grading resistor and the second voltage grading resistor being connected in series, and
Described the second discharge circuit comprises discharge diode, the anodic bonding of described discharge diode is to the described control resistor in described voltage control circuit and the node between described control capacitor, and the negative electrode of described discharge diode is connected to the node between described the first voltage grading resistor and described the second voltage grading resistor.
8. illumination control apparatus according to claim 1, wherein, described antihunt circuit and described rectification unit are connected in parallel, and comprise damped resistor and the damped capacitor being connected in series.
9. illumination control apparatus according to claim 8, wherein, described switch unit comprises a MOSFET device.
10. illumination control apparatus according to claim 9, wherein, a described MOSFET device and described antihunt circuit are connected in series, the drain electrode of a described MOSFET device is connected to described damped capacitor, the source ground of a described MOSFET device, and the grid of a described MOSFET device is controlled by described switching signal.
11. illumination control apparatus according to claim 8, further comprise:
Leadage circuit, for releasing at the mobile electric current of described dimmer;
Wherein, when described input voltage is non-cut voltage, described phase-cut dimming control circuit quits work described leadage circuit, and when described input voltage is cut voltage, described phase-cut dimming control circuit makes described leadage circuit work.
12. illumination control apparatus according to claim 11, wherein, described leadage circuit comprises the 2nd MOSFET device, drain resistor, protection diode and hold-off diode,
The drain electrode of described the 2nd MOSFET device is connected to the node between described damped resistor and described damped capacitor, the source electrode of described the 2nd MOSFET device is connected to one end of described drain resistor, and the grid of described the 2nd MOSFET device is by the signal controlling of releasing
The other end ground connection of described drain resistor,
The negative electrode of described protection diode is connected to the grid of described the 2nd MOSFET device, and the plus earth of described protection diode, and
The anodic bonding of described hold-off diode is to the grid of described the 2nd MOSFET device, and the negative electrode of described hold-off diode is controlled by described switching signal.
The phase-cut dimming control circuit of 13. 1 kinds of illumination control apparatus, for the antihunt circuit of described illumination control apparatus being quit work when the input voltage of described illumination control apparatus is non-cut voltage, and when described input voltage is cut voltage, make described antihunt circuit work, described phase-cut dimming control circuit comprises:
Detecting unit, the commutating voltage generating for detection of the rectification unit in described illumination control apparatus is non-cut voltage or the detection signal of cut voltage to obtain the described input voltage of indication;
Switch control unit, for based on described detection signal output switching signal; And
Switch unit, for making described antihunt circuit work or quitting work based on described switching signal.
14. phase-cut dimming control circuits according to claim 13, wherein, described switch control unit comprises:
Integrating circuit, for exporting described switching signal; And
Voltage control circuit, for controlling the input voltage of described integrating circuit based on described detection signal.
15. phase-cut dimming control circuits according to claim 14, wherein, described integrating circuit comprises operational amplifier and integrating condenser, the positive input terminal of described operational amplifier is connected to reference voltage, the output of described operational amplifier is exported described switching signal, and described integrating condenser is connected between the negative input end and output of described operational amplifier, and
Described voltage control circuit comprises control resistor and the control capacitor being connected in series, one end of described control resistor is connected to supply voltage, the other end of described control resistor is connected to one end of described control capacitor, the other end ground connection of described control capacitor, and the node between described control resistor and described control capacitor is connected to the negative input end of described operational amplifier.
16. phase-cut dimming control circuits according to claim 15, wherein, described cut voltage comprises forward position cut voltage, and described detecting unit comprises:
High fdrequency component is extracted circuit, for extracting high fdrequency component as described detection signal from described commutating voltage; And
The first discharge circuit, when indicating described input voltage to be described forward position cut voltage when described detection signal, makes the described control capacitor electric discharge in the described voltage control circuit in described switch control unit.
17. phase-cut dimming control circuits according to claim 16, wherein, described high fdrequency component is extracted circuit and described rectification unit is connected in parallel, and comprises that the extraction capacitor, first being connected in series extracts resistor and second and extracts resistor, and
Described the first discharge circuit comprises discharge diode, the collector electrode of described discharge diode is connected to described control resistor in described voltage control circuit and the node between described control capacitor, the grounded emitter of described discharge diode, and the base stage of described discharge diode is connected to the described first node extracting between resistor and described the second extraction resistor.
18. according to the phase-cut dimming control circuit described in any one in claim 15-17, and wherein, described cut voltage comprises rear along cut voltage, and described detecting unit comprises:
Bleeder circuit, obtains voltage division signal as described detection signal for described commutating voltage being carried out to dividing potential drop, usining; And
The second discharge circuit, is described rear during along cut voltage for indicate described input voltage when described detection signal, makes the described control capacitor electric discharge in the described voltage control circuit in described switch control unit.
19. phase-cut dimming control circuits according to claim 18, wherein, described bleeder circuit and described rectification unit are connected in parallel, and comprise the first voltage grading resistor and the second voltage grading resistor being connected in series, and
Described the second discharge circuit comprises discharge diode, the anodic bonding of described discharge diode is to the described control resistor in described voltage control circuit and the node between described control capacitor, and the negative electrode of described discharge diode is connected to the node between described the first voltage grading resistor and described the second voltage grading resistor.
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| CN201210353365.3A CN103687154B (en) | 2012-09-20 | 2012-09-20 | Phase-cut dimming controls circuit and illumination control apparatus |
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