CN203984731U - The illuminator of luminosity section level control circuit and sectional dimming - Google Patents
The illuminator of luminosity section level control circuit and sectional dimming Download PDFInfo
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- CN203984731U CN203984731U CN201420334435.5U CN201420334435U CN203984731U CN 203984731 U CN203984731 U CN 203984731U CN 201420334435 U CN201420334435 U CN 201420334435U CN 203984731 U CN203984731 U CN 203984731U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model provides the illuminator of a kind of luminosity section level control circuit and sectional dimming.Described control circuit comprises: outside input detects electronic circuit, and it detects connection and the disconnection of external voltage; Supply voltage varitron circuit, it converts external voltage and stablizes to default supply voltage; Voltage stabilizing module, it will be preset supply voltage step-down and stablize to first threshold voltage; Constant speed electric discharge electronic circuit, it accurately discharges to the first electric capacity according to constant discharge speed when externally voltage disconnects; And logic subcircuit, it records the present segment level of the luminosity of luminescent device, and is reset to reset section level during lower than Second Threshold voltage at the voltage of the first electric capacity.By selecting capacitance and the discharge current value of the first electric capacity in each luminescence unit, make in each luminescence unit the first electric capacity identical to the time of Second Threshold voltage from first threshold lower voltage, avoided the inconsistent inconsistent problem of brightness section level causing discharge time due to each luminescence unit.
Description
Technical field
The utility model relates to sectional dimming technical field, and relates more specifically to the illuminator of a kind of luminosity section level control circuit and sectional dimming.
Background technology
At present, to illuminating product, energy-conservation requirement improves gradually, the lighting illumination intensity that need to need according to ambient brightness adjustment, now just need light fixture to possess dimming function, especially in public places or office space,, for this kind of situation, on market, there is the light fixture of a variety of tunable optical.
In actual applications, in same place, generally adopt the light fixture of same tunable optical, often need to install the light fixture of this tunable optical of many groups simultaneously, and utilize unified switch to control uniformly the light fixture of installed many groups tunable optical.The application that utilizes switch on wall to carry out sectional dimming as unified switch comes into vogue gradually, for example, opens for the first time switch, light fixture 100% brightness, opens after closing for the second time, and light fixture becomes 60% brightness, after closing, open for the third time, light fixture can become 30% brightness.
Sectional dimming is applied in the control of light fixture of single tunable optical can there is not stationary problem, yet organizes independently light fixture if utilize a switch on wall to control simultaneously more, often there will be the nonsynchronous situation of lamp brightness.
Fig. 1 shows the circuit basic structure that a kind of traditional switch on wall is controlled sectional dimming, and Fig. 2 shows the voltage at pin VCC place that the switch on wall shown in Fig. 1 is controlled the control chip IC of sectional dimming circuit.
When switch on wall ON (t0 starts), VCC pin reaches (t1) after cut-in voltage VDD_ON, output high brightness 100% (t1-t2), when switch on wall OFF (t2), the discharge loop of electrochemical capacitor EC mainly discharges by control chip IC inside, the voltage that makes VCC pin very fast (being approximately ms level) drops to VDD_OFF (t2-t3), now lamp extinguishes (t3), and then the discharge loop of electrochemical capacitor EC changes and makes discharge rate slow down (t3-t4).When switch on wall is at t4 constantly again during ON, if now the voltage of VCC pin is higher than V_REF, control chip IC enters logic state, when the voltage of VCC pin reaches VDD_ON (t5), and output intermediate luminance 60% (t5-t6).Yet, as switch on wall (t6) during OFF again, the voltage of VCC pin very fast (being approximately ms level) drops to VDD_OFF (t6-t7), lamp extinguishes (t7), at the voltage drop of VCC pin, below V_REF when (IC resetting time put t9), control chip IC can automatically reset.As switch on wall (t10) during ON again, due to control chip, IC automatically resets, and therefore cannot enter logic state to show low-light level 30% according to pre-provisioning request, can export high brightness 100% on the contrary.
In the process of the voltage VCC electric discharge of above-mentioned VCC pin, it is mainly the value that depends primarily on time of the discharge process from VDD_OFF to V_REF the capacitance of electrochemical capacitor EC, equivalent impedance discharge and V_REF.Because the capacitance of VCC electrochemical capacitor is larger, the discharge time from VDD_OFF to V_REF is conventionally in a few minutes even in tens seconds.
Should be appreciated that, in Fig. 2, only show the situation of a light fixture.When in concrete application, single switch on wall is controlled the LED light fixture of a plurality of independent current sources uniformly, if each LED light fixture is different the discharge time from VDD_OFF to V_REF, in the process of sectional dimming, may there is so the inconsistent situation of a plurality of LED lamp brightness.For example, when switch on wall closed first-open-closed-open-again in closed application, the brightness of all LED light fixtures should be all 30% brightness.Yet under practical application, because each LED light fixture is different the discharge time from VDD_OFF to V_REF, may have the brightness of a part of light fixture is 30% brightness, and the brightness of another part light fixture is the situation of 100% brightness, and this makes client's experience variation.If need, recover consistent brightness, need powered-down to wait for the long period, to guarantee that the control chip IC in whole light fixtures all resets, this also further makes client's experience variation.
Utility model content
For the problems referred to above, the utility model provides the illuminator of a kind of luminosity section level control circuit and sectional dimming, by accurately controlling the velocity of discharge of the connected electric capacity of luminosity section level control circuit, make the resetting time of logic subcircuit in each luminescence unit basic identical.
According to the utility model on the one hand, the luminosity section level control circuit that the utility model embodiment provides comprises: outside input detects electronic circuit, is configured to detect connection and the disconnection of external voltage; Supply voltage varitron circuit, is configured to described external voltage be converted and stablize to default supply voltage; Voltage stabilizing module, is configured to described default supply voltage step-down and stablizes to first threshold voltage, and described first threshold voltage is offered to the first electric capacity as charging voltage; Constant speed electric discharge electronic circuit, is configured to, when described outside input detection electronic circuit detects the disconnection of external voltage, according to constant discharge speed, accurately described the first electric capacity be discharged; And logic subcircuit, be configured to record the present segment level of the luminosity of luminescent device, and the present segment level of recorded luminosity be reset to reset section level at the voltage at described the first electric capacity two ends during lower than Second Threshold voltage.The luminosity of described luminescent device comprises at least two section levels, described reset section level is default section of level in described at least two section levels, and described default supply voltage provides stable supply voltage for described Voltage stabilizing module and described logic subcircuit, described first threshold voltage is higher than described Second Threshold voltage, and described first threshold voltage is lower than described default supply voltage.
According to the utility model on the other hand, the illuminator of the sectional dimming that the utility model embodiment provides comprises the luminescence unit of at least two sectional dimmings, and each luminescence unit has independently luminescent device, luminosity section level control circuit as above, the first electric capacity, emission control circuit and drive circuit.The section level that described emission control circuit provides according to the logic subcircuit in described luminosity section level control circuit produces drive control signal; Described drive circuit drives described luminescent device luminous according to described drive control signal.Luminosity section level control circuit and the first electric capacity in described each luminescence unit have identical circuit parameter, and described circuit parameter drift in preset range within.
According to the utility model embodiment, in the situation that the luminescence unit of at least two sectional dimmings forms the illuminator of sectional dimming and the luminescence unit of each sectional dimming carries out the control of luminosity section level independently, by suitably selecting the current value of constant current and the capacitance of described the first electric capacity described in the luminescence unit of each sectional dimming, after external voltage described in the luminescence unit of each sectional dimming is disconnected, the retention time of the present segment level of the luminosity of described luminescent device is identical, thereby the luminescence unit of each sectional dimming can be synchronously reset, avoided thus the inconsistent inconsistent problem of brightness section level causing discharge time due to the luminescence unit of each sectional dimming.
Accompanying drawing explanation
In conjunction with the drawings embodiment of the present utility model is described in detail, above-mentioned and other object, feature, advantage of the present utility model will become apparent, wherein:
Fig. 1 shows the circuit basic structure that a kind of traditional switch on wall is controlled sectional dimming;
Fig. 2 shows the voltage at pin VCC place that switch on wall shown in Fig. 1 is controlled the control chip IC of sectional dimming circuit;
Fig. 3 shows according to the indicative flowchart of the luminosity section level control operation of the luminosity section level control circuit of the utility model embodiment;
Fig. 4 shows according to the schematic block circuit diagram of the luminosity section level control circuit of the utility model embodiment; And
Fig. 5 shows according to the schematic circuit of the luminosity section level control circuit of the utility model embodiment.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present utility model.Here, it should be noted that in the accompanying drawings, identical Reference numeral is given and substantially had part identical or similar structures and function, and will omit being repeated in this description about them.
Fig. 3 shows according to the indicative flowchart of the luminosity section level control operation 300 of the luminosity section level control circuit of the utility model embodiment.According to the luminosity section level control operation 300 of the luminosity section level control circuit of the utility model embodiment, be applied to regulate according to the section level of predetermined quantity the luminescence unit of luminosity, the section level of described predetermined quantity is at least two section levels.
For example, in the situation that the section level of described predetermined quantity is three section levels, the luminosity of first paragraph level is 100% brightness, and the luminosity of second segment level is 60% brightness, and the luminosity of the 3rd section of level is 30% brightness.In the case, open for the first time switch, light fixture 100% brightness, opens after closing for the second time, and light fixture becomes 60% brightness, after closing, opens for the third time, and light fixture can become 30% brightness.
At step S310, receive external voltage input, and detect connection and the disconnection of external voltage.
On the one hand, electro-detection on carrying out in step S310, can first the external voltage of input be carried out to preliminary treatment and conversion to obtain for carrying out the detection voltage of power on and off detection, again the detection voltage so obtaining and the default detection threshold voltage that powers on are compared, and at the detection voltage so obtaining, higher than default, power on during detection threshold voltage, electrifying condition detected.Alternatively, at the detection voltage so obtaining, from be not less than described default powering on during detection threshold voltage lower than becoming, electrifying condition detected.
For example, the external voltage of input carried out preliminary treatment and converted such as thinking rectification processing, filtering processing and voltage division processing etc., in the utility model embodiment, it specifically not limited.
On the other hand, in step S310, also carry out detection of power loss, when detection voltage as above becomes lower than default detection of power loss threshold voltage from being not less than, power-down conditions detected.Detection threshold voltage powers on described in described detection of power loss threshold voltage is less than or equal to.
In addition, in step S310, except carrying out upper electro-detection and detection of power loss, in the situation that receiving external voltage, the external voltage of input can also be carried out to extra processing and conversion, to utilize described external voltage to produce stable default supply voltage and default first threshold voltage.Described stable default supply voltage subsequently can be as the supply voltage of the control circuit in described luminescence unit.Described first threshold voltage is lower than described default supply voltage.
At step S320, judge whether to detect the connection of external voltage.
In the situation that step S320 judgement detects the connection of external voltage, according to the luminosity section level control operation of the luminosity section level control circuit of the utility model embodiment, proceed to step S330.
At step S330, by the first capacitor charging to described first threshold voltage.
In the description process of the utility model embodiment, although step S310-S330 is described according to priority step, yet should be appreciated that step S310-S330 can be not exclusively precedence relationship.For example, at step S310, can only detect connection and the disconnection of external voltage, and at step S320, can judge whether to detect the connection of external voltage, and can also utilize on the other hand described external voltage to produce stable default supply voltage and first threshold voltage.Alternatively, also can utilize described external voltage to produce stable default supply voltage and first threshold voltage at step S330.
At step S340, judge whether to detect the disconnection of external voltage.
In the situation that step S340 judgement detects the disconnection of external voltage, according to the luminosity section level control operation of the luminosity section level control circuit of the utility model embodiment, proceed to step S350.
At step S350, according to constant discharge speed, accurately described the first electric capacity is discharged.
At step S360, judge that whether the voltage at described the first electric capacity two ends is lower than Second Threshold voltage.
In the situation that step S360 judges that the voltage at described the first electric capacity two ends is lower than described Second Threshold voltage, according to the luminosity section level control operation of the luminosity section level control circuit of the utility model embodiment, proceed to step S370.
As example, can utilize constant current to discharge to described the first electric capacity, thereby make the velocity of discharge of described the first electric capacity constant, can accurately control thus described the first electric capacity and from described first threshold voltage, be discharged to the discharge time of described Second Threshold voltage.
In the situation that utilizing constant current to discharge to the first electric capacity, suppose that constant current is Ic, the relation between the voltage Vc at the first electric capacity two ends, the capacitance C1 of the first electric capacity and constant current Ic can be expressed as:
Ic＝C1×(dVc/dt)……(1)
Correspondingly, the time that the voltage Vc at described the first electric capacity two ends discharges into Second Threshold voltage Vth2 from first threshold voltage Vth1 can be expressed as:
Δt＝C1×(Vth1-Vth2)/Ic……(2)
By suitably selecting the current value I c of described constant current and the capacitance C1 of described the first electric capacity, control described the first electric capacity and from described first threshold voltage Vth1, be discharged to the discharge time of described Second Threshold voltage Vth2.Should be appreciated that, be the retention time of the present segment level of the luminosity of described luminescent device described external voltage disconnects the discharge time that described the first electric capacity is discharged to described Second Threshold voltage Vth2 from described first threshold voltage Vth1.
When the described retention time not yet expires, when the voltage Vc at described the first electric capacity two ends is not yet discharged to described Second Threshold voltage Vth2, the present segment level of the luminosity of described luminescent device is continued to be kept.
When the described retention time expires, when the voltage Vc at described the first electric capacity two ends has been discharged to described Second Threshold voltage Vth2, the present segment level of the luminosity of described luminescent device is reset to described reset section level.
At step S370, the present segment level of recorded luminosity is reset to reset section level, described reset section level is default section of level in described at least two section levels.As example, described reset section level can be the first paragraph level in described at least two section levels, and in other words, described reset section level can be maximum brightness section level corresponding with the highest luminosity in described at least two section levels.Alternatively, described reset section level can be the back segment level in described at least two section levels, and in other words, described reset section level can be minimum brightness section level corresponding with minimum luminosity in described at least two section levels.More generally, described reset section level can be also the arbitrary interlude level in described at least two section levels, in other words, described reset section level can be intermediate luminance section level corresponding with arbitrary middle luminosity in described at least two section levels, for example, the intermediate luminance section level corresponding with 70% or 80% luminosity.
Should be appreciated that, the utility model embodiment does not make any restriction to the concrete value of reset section level, the utility model embodiment is intended to accurately control the velocity of discharge and the discharge time of each luminescence unit that is unified control, and the utility model embodiment only need guarantee that each luminescence unit that is unified control has identical luminosity after being reset.
In addition, should be appreciated that, in the utility model embodiment, the present segment level of described recorded luminosity can be that luminescence unit is opened section level that needs demonstration next time after this is closed, or can be also the section level that luminescence unit had shown before this is closed.According to different needs or different circuit design, those skilled in the art can select concrete implementation.
Therefore, in the situation that the luminescence unit of at least two sectional dimmings forms the illuminator of sectional dimming and the luminescence unit of each sectional dimming carries out the control of luminosity section level independently, according to the luminosity section level control operation of the utility model embodiment, by suitably selecting the current value of constant current and the capacitance of described the first electric capacity described in the luminescence unit of each sectional dimming, after external voltage described in the luminescence unit of each sectional dimming is disconnected, the retention time of the present segment level of the luminosity of described luminescent device is identical, thereby the luminescence unit of each sectional dimming can be synchronously reset, avoided thus the inconsistent inconsistent problem of brightness section level causing discharge time due to the luminescence unit of each sectional dimming.
Next, with reference to Fig. 4-5, describe according to the luminosity section level control circuit of the utility model embodiment.
Fig. 4 shows according to the indicative flowchart of the luminosity section level control circuit of the utility model embodiment.According to the luminosity section level control circuit of the utility model embodiment, for the section level according to predetermined quantity, regulate the luminescence unit of luminosity, the section level of described predetermined quantity is at least two section levels.As previously mentioned, for example, in the situation that the section level of described predetermined quantity is three section levels, the luminosity of first paragraph level is 100% brightness, and the luminosity of second segment level is 60% brightness, and the luminosity of the 3rd section of level is 30% brightness.
In order to clearly illustrate that according to the circuit structure of the luminosity section level control circuit of the utility model embodiment, be described below and do not illustrate in Fig. 4-5 circuit structure of the other parts of luminescence unit, described other parts include but not limited to the drive circuit of luminescence unit.
As shown in Figure 4, described luminosity section level control circuit comprises: outside input detects electronic circuit 410, supply voltage varitron circuit 420, Voltage stabilizing module 430, constant speed electric discharge electronic circuit 440 and logic subcircuit 450.
Described outside input detects connection and the disconnection that electronic circuit 410 is configured to detect external voltage.
The operation that detects the connection of external voltage also can be called as electro-detection.As example, described outside input detects electronic circuit 410 and can comprise rectification module, filtering and division module and the first voltage comparison module (not specifically illustrating).Rectification module is direct voltage by the external voltage rectification of interchange, filtering and division module utilize the direct voltage of rectification module output to obtain stable detection voltage, and described the first voltage comparison module compares the detection voltage of filtering and division module output with the default detection threshold voltage that powers on.Can or certain specific saltus step of this comparative result be continued to use to the testing result of making upper electro-detection by the comparative result of the first voltage comparison module output.
The operation that detects the disconnection of external voltage also can be called as detection of power loss.As example, described outside input detects electronic circuit 410 and can also comprise second voltage comparison module (not specifically illustrating), and the detection voltage that described second voltage comparison module can be exported filtering and division module and default detection of power loss threshold voltage compare.Similarly, the comparative result of second voltage comparison module output or certain specific saltus step of this comparative result can be continued to use to the testing result of making detection of power loss.Detection threshold voltage powers on described in described detection of power loss threshold voltage is less than or equal to.
Should be appreciated that, described the first and second voltage comparison module can be same voltage comparison module, and in the case, detection threshold voltage powers on described in described detection of power loss threshold voltage equals.For example, voltage comparison module output high level described in when detecting voltage higher than default power on/off detection threshold voltage and in the situation that voltage comparison module output low level described in while detecting voltage lower than default power on/off detection threshold voltage, can be by the high level of described voltage comparison module output or upper hopping edge the testing result as upper electro-detection, and can be by the low level of described voltage comparison module output or lower hopping edge the testing result as detection of power loss.
Described supply voltage varitron circuit 420 is configured to described external voltage is converted and stablize to default supply voltage.Voltage stabilizing module 430 is configured to described default supply voltage step-down and stablizes to first threshold voltage, and described first threshold voltage is offered to the first capacitor C 1 as charging voltage.For example, described Voltage stabilizing module 430 can consist of voltage stabilizing chip LDO.Described first threshold voltage is lower than described default supply voltage.For example, described default supply voltage can be 5V, and described first threshold voltage can be 3V; Or described default supply voltage can be 12V, described first threshold voltage can be 5V.
Described default supply voltage provides stable supply voltage for the luminosity section level control circuit according to the utility model embodiment, so that guarantee can normal running according to the luminosity section level control circuit of the utility model embodiment.
Constant speed electric discharge electronic circuit 440 is configured to, when described outside input detection electronic circuit 410 detects the disconnection of external voltage, according to constant discharge speed, accurately described the first capacitor C 1 be discharged.
As example, described constant speed electric discharge electronic circuit 440 can comprise constant flow module 4410 and discharge module 4420.
Described constant flow module 4410 is configured to provide constant current.Described discharge module 4420 is configured to utilize described constant current to discharge to described the first capacitor C 1, thereby makes the velocity of discharge of described the first capacitor C 1 constant.
As previously mentioned, in the situation that utilizing constant current to discharge to the first capacitor C 1, the time that the voltage Vc at described the first capacitor C 1 two ends discharges into Second Threshold voltage Vth2 from first threshold voltage Vth1 can be expressed as:
Δt＝C1×(Vth1-Vth2)/Ic
By first threshold voltage Vth1 and Second Threshold voltage Vth2 are set, and by suitably selecting the current value I c of described constant current and the capacitance of described the first capacitor C 1, can control described the first capacitor C 1 and from described first threshold voltage Vth1, be discharged to the discharge time of described Second Threshold voltage Vth2.Should be appreciated that, be the retention time of the present segment level of the luminosity of described luminescent device described external voltage disconnects the discharge time that described the first capacitor C 1 is discharged to described Second Threshold voltage Vth2 from described first threshold voltage Vth1.
When the described retention time not yet expires, when the voltage Vc at described the first capacitor C 1 two ends is not yet discharged to described Second Threshold voltage Vth2, the present segment level of the luminosity of described luminescent device is continued to be kept.When the described retention time expires, when the voltage Vc at described the first capacitor C 1 two ends has been discharged to described Second Threshold voltage Vth2, the present segment level of the luminosity of described luminescent device is reset to described reset section level.
Logic subcircuit 450 is configured to record the present segment level of the luminosity of luminescent device, and the present segment level of recorded luminosity is reset to reset section level at the voltage at described the first capacitor C 1 two ends during lower than Second Threshold voltage.Described reset section level can be default section of level in described at least two section levels.Described first threshold voltage Vth1 is higher than described Second Threshold voltage Vth2.
As previously mentioned, in the utility model embodiment, the present segment level of described recorded luminosity can be that luminescence unit is opened section level that needs demonstration next time after this is closed, or can be also the section level that luminescence unit had shown before this is closed.According to different needs or different circuit design, those skilled in the art can select concrete implementation.
As example, described reset section level can be the first paragraph level in described at least two section levels, and in other words, described reset section level can be maximum brightness section level corresponding with the highest luminosity in described at least two section levels.Alternatively, described reset section level can be the back segment level in described at least two section levels, and in other words, described reset section level can be minimum brightness section level corresponding with minimum luminosity in described at least two section levels.More generally, described reset section level can be also the arbitrary interlude level in described at least two section levels, in other words, described reset section level can be intermediate luminance section level corresponding with arbitrary middle luminosity in described at least two section levels, for example, the intermediate luminance section level corresponding with 70% or 80% luminosity.
In addition, as shown in Figure 4, according to the luminosity section level control circuit of the utility model embodiment, can also comprise that charging electronic circuit 460, control electronic circuit 470 and voltage ratio are compared with electronic circuit 480.
Described control electronic circuit 460 is configured to detect when electronic circuit 410 detects the connection of external voltage and provide charging control signal to charging electronic circuit 460 in described outside input, and detects when electronic circuit 410 detects the disconnection of external voltage and provide discharge control signal to described constant speed electric discharge electronic circuit 440 in described outside input.
Described charging electronic circuit 460 is connected with described the first capacitor C 1 with described Voltage stabilizing module 430, and is configured to, in response to described charging control signal, the first capacitor C 1 is charged to first threshold voltage Vth1.
Described voltage ratio is configured to the voltage at the first capacitor C 1 two ends and Second Threshold voltage Vth2 to compare and output voltage comparative result compared with electronic circuit 470.
As shown in Figure 4, described default supply voltage provides stable supply voltage compared with electronic circuit 480 for described Voltage stabilizing module 430, described logic subcircuit 450, described control electronic circuit 470 and described voltage ratio.
Fig. 5 shows according to the electrical block diagram of the luminosity section level control circuit of the utility model embodiment.
As shown in Figure 5, described control electronic circuit 470 can comprise that PWM produces circuit, and the first output that described PWM produces circuit is connected with described charging submodule 460, and the second output that described PWM produces circuit is connected with described constant speed electric discharge electronic circuit 440.
Constant flow module 4410 in described constant speed electric discharge electronic circuit 440 can be constant-current source, for example this constant-current source can be mirror current source, discharge module 4420 in described constant-current discharge electronic circuit 440 can comprise second switch device M2, it is controlled the utmost point and connects the second output that described PWM produces circuit, first utmost point connects the first end of described the first capacitor C 1, second utmost point connects the first end of described constant flow module 4410, the second end ground connection of described constant flow module 4410.
Described charging electronic circuit 460 can comprise the first switching device M1, it is controlled the utmost point and connects the first output that described PWM produces circuit, first utmost point connects the output of described Voltage stabilizing module 430, and second utmost point connects the first end of described the first capacitor C 1, the second end ground connection of described the first capacitor C 1.
Described voltage ratio can be voltage comparator compared with electronic circuit 480, and two input connects respectively first end and the Second Threshold voltage Vth2 of described the first capacitor C 1, and exports voltage comparative result to logic subcircuit 450.
As example, when described outside input detection electronic circuit 410 detects the connection of external voltage, described PWM produces circuit and makes described the first switching device M1 conducting at the charging control signal of the first output output, and makes described second switch device M2 cut-off at the discharge control signal of the second output output.On the other hand, when described outside input detection electronic circuit 410 detects the disconnection of external voltage, described PWM produces circuit and makes described the first switching device M1 cut-off at the charging control signal of the first output output, and makes described second switch device M2 conducting at the discharge control signal of the second output output.
Described the first switching device M1 and second switch device M1 can be the switching device of same type, or can be dissimilar switching device.
When described the first switching device M1 and second switch device M2 are N-type metal-oxide-semiconductor, it is described when described outside input detection electronic circuit 410 detects the connection of external voltage, described PWM produces circuit and at the charging control signal of the first output output, is high level and is low level at the discharge control signal of the second output output, now described the first switching device M1 conducting and described second switch device M2 cut-off.On the other hand, when described outside input detection electronic circuit 410 detects the disconnection of external voltage, described PWM produces circuit and at the charging control signal of the first output output, is low level and is high level at the discharge control signal of the second output output, now described the first switching device M1 cut-off and described second switch device M2 conducting.
At described the first switching device M1, be that N-type metal-oxide-semiconductor and second switch device M2 are while being P type metal-oxide-semiconductor, it is described when described outside input detection electronic circuit 410 detects the connection of external voltage, described PWM produces circuit and at the charging control signal of the first output output, is high level and is also high level at the discharge control signal of the second output output, now described the first switching device M1 conducting and described second switch device M2 cut-off.On the other hand, when described outside input detection electronic circuit 410 detects the disconnection of external voltage, described PWM produces circuit and at the charging control signal of the first output output, is low level and is low level at the discharge control signal of the second output output, now described the first switching device M1 cut-off and described second switch device M2 conducting.In the case, the first output and the second output that described PWM produces circuit can be same output, when described same output is exported the first level, described the first switching device M1 conducting and described second switch device M2 cut-off, when described same output output second electrical level, described the first switching device M1 cut-off and described second switch device M2 conducting, however the utility model is not limited to this.
In addition, according to the utility model embodiment, a kind of illuminator of sectional dimming is also provided, it comprises the luminescence unit of at least two sectional dimmings, and each luminescence unit has independently luminescent device, luminosity section level control circuit as above, the first electric capacity, emission control circuit and drive circuit.
The section level that described emission control circuit in each luminescence unit provides according to the logic subcircuit in described luminosity section level control circuit produces drive control signal.Described drive circuit in each luminescence unit drives described luminescent device luminous according to described drive control signal.
Luminosity section level control circuit and the first electric capacity in described each luminescence unit have identical circuit parameter, and described circuit parameter drift in preset range within, thereby guarantee that the discharge time that in each luminescence unit, the first electric capacity discharges into Second Threshold voltage from first threshold voltage is basically identical.
Therefore, according to the utility model embodiment, in the situation that the luminescence unit of at least two sectional dimmings forms the illuminator of sectional dimming and the luminescence unit of each sectional dimming carries out the control of luminosity section level independently, by suitably selecting the current value of constant current and the capacitance of described the first electric capacity described in the luminescence unit of each sectional dimming, after external voltage described in the luminescence unit of each sectional dimming is disconnected, the retention time of the present segment level of the luminosity of described luminescent device is identical, thereby the luminescence unit of each sectional dimming can be synchronously reset, avoided thus the inconsistent inconsistent problem of brightness section level causing discharge time due to the luminescence unit of each sectional dimming.
In the utility model embodiment, described the first electric capacity can be patch capacitor.In addition,, in the utility model embodiment, described the first electric capacity can also be connected with discharge resistance.
Although the utility model utilizes switch on wall launch to describe as example, should be appreciated that, the utility model is obviously not limited to switch on wall, and should be applied to other for controlling uniformly the unified switches of organizing devices more.
Although in the utility model embodiment, luminescent device is expressed as to LED, yet the utility model is not limited to this, luminescent device can comprise current mode luminescent device.In addition, although in the utility model embodiment, the metal-oxide-semiconductor of take is described the first and second switching device M1 and M2 as example, yet the utility model is not limited to this.
Although example embodiment has been described with reference to the drawings here, it is only exemplary should understanding above-mentioned example embodiment, and is not intended to scope of the present utility model to be limited to this.Those of ordinary skills can make various changes and modifications therein, and do not depart from scope and spirit of the present utility model.Within all such changes and modifications are intended to be included in the desired scope of the present utility model of claims.
Claims (7)
1. a luminosity section level control circuit, is characterized in that comprising:
Outside input detects electronic circuit, is configured to detect connection and the disconnection of external voltage;
Supply voltage varitron circuit, is configured to described external voltage be converted and stablize to default supply voltage;
Voltage stabilizing module, is configured to described default supply voltage step-down and stablizes to first threshold voltage, and described first threshold voltage is offered to the first electric capacity as charging voltage;
Constant speed electric discharge electronic circuit, is configured to, when described outside input detection electronic circuit detects the disconnection of external voltage, according to constant discharge speed, accurately described the first electric capacity be discharged; And
Logic subcircuit, is configured to record the present segment level of the luminosity of luminescent device, and the present segment level of recorded luminosity is reset to reset section level at the voltage at described the first electric capacity two ends during lower than Second Threshold voltage,
Wherein, the luminosity of described luminescent device comprises at least two section levels, and described reset section level is default section of level in described at least two section levels, and
Described default supply voltage provides stable supply voltage for described Voltage stabilizing module and described logic subcircuit, and described first threshold voltage is higher than described Second Threshold voltage, and described first threshold voltage is lower than described default supply voltage.
2. luminosity section level control circuit as claimed in claim 1, is characterized in that, described constant speed electric discharge electronic circuit comprises:
Constant flow module, is configured to provide constant current; And
Discharge module, is configured to utilize described constant current to discharge to described the first electric capacity, thereby makes the velocity of discharge of described the first electric capacity constant.
3. luminosity section level control circuit as claimed in claim 2, is characterized in that, also comprises:
Control electronic circuit, be configured to detect when electronic circuit detects the connection of external voltage and provide charging control signal to charging electronic circuit in described outside input, and detect when electronic circuit detects the disconnection of external voltage and provide discharge control signal to described constant speed electric discharge electronic circuit in described outside input;
Described charging electronic circuit, is connected with described the first electric capacity with described Voltage stabilizing module, and is configured in response to described charging control signal the first capacitor charging to first threshold voltage; And
Voltage ratio is compared with electronic circuit, is configured to the voltage at the first electric capacity two ends and Second Threshold voltage compares and output voltage comparative result;
Wherein, described default supply voltage provides stable supply voltage compared with electronic circuit for described control electronic circuit and described voltage ratio.
4. luminosity section level control circuit as claimed in claim 3, is characterized in that,
Described control electronic circuit comprises that PWM produces circuit,
Described charging electronic circuit comprises the first switching device, and it is controlled the utmost point and connects the first output that described PWM produces circuit, and first utmost point connects the output of described Voltage stabilizing module, and second utmost point connects the first end of described the first electric capacity, the second end ground connection of described the first electric capacity; And
Described discharge module comprises second switch device, and it is controlled the utmost point and connects the second output that described PWM produces circuit, and first utmost point connects the first end of described the first electric capacity, and second utmost point connects the first end of described constant flow module, the second end ground connection of described constant flow module.
5. luminosity section level control circuit as claimed in claim 4, is characterized in that,
When described outside input detection electronic circuit detects the connection of external voltage, described PWM produces circuit and makes described the first switching device conducting at the charging control signal of the first output output, and makes described second switch device cut-off at the discharge control signal of the second output output;
When described outside input detection electronic circuit detects the disconnection of external voltage, described PWM produces circuit and makes described the first switching device cut-off at the charging control signal of the first output output, and makes described second switch break-over of device at the discharge control signal of the second output output.
6. luminosity section level control circuit as claimed in claim 5, it is characterized in that, the first output and the second output that described PWM produces circuit are same output, when described same output is exported the first level, described the first switching device conducting and the cut-off of described second switch device, when described same output output second electrical level, described the first switching device cut-off and described second switch break-over of device.
7. the illuminator of a sectional dimming, it is characterized in that, the luminescence unit that comprises at least two sectional dimmings, each luminescence unit has independently luminescent device, luminosity section level control circuit, the first electric capacity, emission control circuit and drive circuit as described in any one in claim 1-6, wherein
The section level that described emission control circuit provides according to the logic subcircuit in described luminosity section level control circuit produces drive control signal;
Described drive circuit drives described luminescent device luminous according to described drive control signal,
Wherein, luminosity section level control circuit and the first electric capacity in described each luminescence unit have identical circuit parameter, and described circuit parameter drift in preset range within.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420334435.5U CN203984731U (en) | 2014-06-20 | 2014-06-20 | The illuminator of luminosity section level control circuit and sectional dimming |
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| CN201420334435.5U CN203984731U (en) | 2014-06-20 | 2014-06-20 | The illuminator of luminosity section level control circuit and sectional dimming |
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| CN203984731U true CN203984731U (en) | 2014-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105451403A (en) * | 2014-06-20 | 2016-03-30 | 欧普照明股份有限公司 | Brightness level control method and circuit, and segmented light adjustment illumination system |
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2014
- 2014-06-20 CN CN201420334435.5U patent/CN203984731U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105451403A (en) * | 2014-06-20 | 2016-03-30 | 欧普照明股份有限公司 | Brightness level control method and circuit, and segmented light adjustment illumination system |
| CN105451403B (en) * | 2014-06-20 | 2019-01-22 | 欧普照明股份有限公司 | The lighting system of light emission luminance section grade control method and circuit, sectional dimming |
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