CN203801120U - Switch segmented dimming circuit for LED driver - Google Patents
Switch segmented dimming circuit for LED driver Download PDFInfo
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- CN203801120U CN203801120U CN201420130001.3U CN201420130001U CN203801120U CN 203801120 U CN203801120 U CN 203801120U CN 201420130001 U CN201420130001 U CN 201420130001U CN 203801120 U CN203801120 U CN 203801120U
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims description 27
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The utility model discloses a switch segmented dimming circuit for an LED driver, which comprises a power-off detection circuit, a power-off cycle counting circuit, a sustaining voltage generation circuit, a voltage sustaining capacitor, a shift selection circuit, and an output current control circuit. The power-off detection circuit is used for judging and processing power-off signals received from a detection circuit. When the power goes off, the power-off detection circuit outputs a POFF signal. The power-off cycle counting circuit is used for counting POFF signals outputted by the power-off detection circuit and maintaining the counting result Q(n:1) after the power goes off. The sustaining voltage generation circuit is used for generating a sustaining voltage. The shift selection circuit is used for outputting a reference voltage or a reference current REF according to the counting result Q(n:1). The output current control circuit is used for outputting an output current corresponding to the counting result Q(n:1) based on the reference voltage or the reference current REF. According to the technical scheme of the utility model, a user only needs to conduct the power-off operation and the power-on operation repeatedly by means of a common switch to realize the dimming function, without the need of any special dimmer. Meanwhile, the switch segmented dimming circuit is very simple in application and installation.
Description
Technical field
The utility model relates to a kind of switch-segment light adjusting circuit for general lighting, relates in particular to a kind of switch-segment light adjusting circuit of LED illumination application.
Background technology
Along with the maturation of LED Driving technique, and LED light source has environmental protection and the advantage such as energy-conservation, and LED illumination is day by day universal.And adjustable in order to meet the brightness of LED light fixture, current various dimming modes have also been applied to LED illumination, and wherein most widely used is controllable silicon light modulation.
But controllable silicon light modulation exists shortcomings: the first, controllable silicon has destroyed sinusoidal wave waveform, has increased harmonic constant, has reduced power factor (PF); The second, nonsinusoidal waveform transmission on the line can cause larger electromagnetic interference; The 3rd, after controlled silicon conducting, need one to maintain electric current, if it is inadequate to maintain electric current, the angle of flow can be unstable, this will cause the flicker of LED lamp; The 4th, controllable silicon light modulation needs special controllable silicon dimmer, need to again construct, and has increased the universal difficulty of LED light fixture.
Utility model content
For the drawback of prior art, the utility model discloses a kind of switch-segment light adjusting circuit driving for LED, can utilize repeatedly disconnecting and turn-offing the object that realizes sectional dimming of regular tap.
For achieving the above object, the utility model provides a kind of switch-segment light adjusting circuit driving for LED, comprising: a power cut-off testing circuit, for the detectable voltage signals that receives testing circuit is processed to judgement, when after power cut-off, this module can be exported POFF signal;
One power cut-off cycle-counter circuit, counts the output signal POFF of power cut-off testing circuit, and after power cut-off, is maintained count results Q (n:1);
One maintains voltage generation circuit, maintains voltage power to power supply cycle-counter circuit for generation of one;
One voltage maintains electric capacity, and this electric capacity is connected on and maintains between voltage and ground, maintains voltage and decline slowly because of electric capacity maintenance effect after power cut-off, powers to power cut-off cycle-counter circuit to maintain certain hour;
One gear selects circuit according to power-off number of times Q (n:1) output one corresponding reference voltage or reference current REF;
One output current control circuit is according to reference voltage or the reference current REF output output current corresponding with Q (n:1);
The output of described power cut-off testing circuit is connected with an input of power cut-off cycle-counter circuit; The described output voltage terminal that maintains voltage generation circuit maintains voltage end and is connected with the electrical input that supplies of power cut-off cycle-counter circuit, maintains voltage simultaneously and is connected with the positive pole that maintains electric capacity of outside, maintains the minus earth of electric capacity; The count results output of described power cut-off cycle-counter circuit selects the input of circuit to be connected with described gear; Described gear selects the output of circuit and the input of described output current control circuit to be connected.
As further preferred embodiment, the described switch-segment light adjusting circuit driving for LED also comprises a voltage outage detection resistance, a detection signal filter capacitor and a voltage stabilizing didoe; A described voltage outage detection resistance, a detection signal filter capacitor, a voltage stabilizing didoe is arranged between testing circuit and power cut-off testing circuit input;
The electric current output cathode of one termination testing circuit of described voltage outage detection resistance, positive pole, the negative pole of voltage stabilizing didoe and the input of power cut-off testing circuit of another termination detection signal filter capacitor of voltage outage detection resistance, the minus earth of described detection signal filter capacitor, the plus earth of described voltage stabilizing didoe.
As further preferred embodiment, the described switch-segment light adjusting circuit driving for LED also comprises supplying resistance and power supply filter capacitor, and described supplying resistance, power supply filter capacitor are arranged at testing circuit input and maintain between voltage generation circuit; It realizes the feeder ear of chip and separating of power cut-off test side.
Described power cut-off cycle-counter circuit, comprises n d type flip flop of undervoltage lockout circuit and connection.
Described testing circuit is ac power supply system circuit or the DC power-supply system circuit that contains rectifier bridge.
The utility model with respect to advantage and the effect of prior art is:
The utility model only need use regular tap to carry out power-off repeatedly, power on to move and can realize dimming function, carry out cycle count according to user's power-off, the number of times that powers on, thereby export corresponding electric current and reach the object of light modulation, without the special controllable silicon dimmer of construction and installation again, and the problem such as flicker problem and electromagnetic interference of having avoided controllable silicon light modulation there will be.
Brief description of the drawings
Fig. 1 is the first embodiment schematic diagram of the switch-segment light adjusting circuit driving for LED described in the utility model;
Fig. 2 is the second embodiment schematic diagram of the switch-segment light adjusting circuit driving for LED described in the utility model;
Fig. 3 is the 3rd embodiment schematic diagram of the switch-segment light adjusting circuit driving for LED described in the utility model;
Fig. 4 is a kind of implementing circuit figure of the switch-segment light adjusting circuit power cut-off cycle-counter circuit driving for LED described in the utility model;
Fig. 5 is that switch-segment light adjusting circuit output current and the switch motion driving for LED described in the utility model is related to schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the switch-segment light adjusting circuit driving for LED described in the utility model is described in further detail.
Embodiment 1
As shown in Figure 1, the first embodiment of the switch-segment light adjusting circuit driving for LED described in the utility model, the described switch-segment light adjusting circuit driving for LED, comprises that a voltage outage detection resistance R 1, a detection signal filter capacitor C2, a voltage stabilizing didoe ZD1, a power cut-off testing circuit, a power cut-off cycle-counter circuit, maintain voltage generation circuit, a voltage maintains capacitor C 3, gear selection circuit and an output current control circuit.One termination rectifier bridge output cathode of described voltage detecting resistance R 1, positive pole, the negative pole of voltage stabilizing didoe ZD1 and the input of power cut-off testing circuit of another termination detection signal filter capacitor C2 of R1, the negative pole of detection signal filter capacitor C2 and the plus earth of voltage stabilizing didoe ZD1; The output of power cut-off testing circuit is connected with an input of power cut-off cycle-counter circuit; Being connected for electrical input of the described output voltage terminal VHOLD that maintains voltage generation circuit and power cut-off cycle-counter circuit, the while, VHOLD was connected with the positive pole that maintains capacitor C 3 of outside, the minus earth of C3; The count results output of described power cut-off cycle-counter circuit selects the input of circuit to be connected with described gear; Gear selects the output of circuit and the input of described output current control circuit to be connected; Output current control circuit directly drives applications circuit and LED lamp.
After powering on for the first time, output current is first grade of acquiescence electric current, after power-off, in holding time, again power on for the first time and can make output current change on the second gear of setting, after power-off, in holding time, again power on and can make output current change in the third gear of setting, by that analogy for the second time; When reach after last gear power-off and holding time in again power on, output current can change to again the first gear acquiescence electric current, so loops light modulation.
After power-off, VDET also can decline with the disconnection of input power, now voltage power failure detection circuit can detect This move, thereby output triggering signal POFF counts to power cut-off cycle-counter circuit, and power cut-off cycle-counter circuit is exported a respective value Q (n:1); Maintaining voltage generation circuit produces one and maintains voltage VHOLD and power to power cut-off cycle-counter circuit, the external electric capacity that maintains of VHOLD, like this after each power-off VHOLD voltage because the energy storage effect of electric capacity and slow decreasing, until VHOLD drops to after the minimum voltage setting, power cut-off cycle-counter circuit can reset to initial value, re-powers so rear output current and can get back to first grade of acquiescence electric current.Power cut-off drops to the minimum voltage setting during this period of time for holding time to VHOLD, so when light modulation, must again power in holding time after power-off; Maintain electric capacity and hold time more greatly also greatlyr, can set according to actual needs.After power-off, in holding time, again power on, VHOLD can be charged to setting maximum again, gear selects circuit also can export corresponding reference voltage or reference current REF according to the numerical value Q (n:1) receiving simultaneously, and output current control circuit is exported corresponding output current according to the reference voltage control receiving.
According to requirement of light regulation difference, light modulation circulation gear number can be set as being greater than any integer gear value of 1, acquiescence electric current can be set as maximum current or minimum current as required, if acquiescence current settings is maximum current, after powering on for the first time, be output as first grade of maximum current, gear electric current below reduces gradually; If acquiescence current settings is minimum current, after powering on for the first time, be output as first grade of minimum current, gear electric current below increases gradually.The electric current of each gear can arbitrarily be set as required, and when setting 3 grades of light modulations and acquiescence electric current and be maximum, second gear electric current can be set as giving tacit consent to 50% of electric current, and third gear can be set as giving tacit consent to 20% of electric current; Set 3 grades of light modulations and acquiescence electric current for hour, second gear electric current can be set as giving tacit consent to 200% of electric current, and third gear can be set as giving tacit consent to 300% of electric current.
Embodiment 2
As shown in Figure 2, the second embodiment of the switch-segment light adjusting circuit driving for LED described in the utility model, the difference of the second embodiment and the first embodiment is: the power supply pin VIN of chip detects pin VDET with power cut-off to be separated, power cut-off detects resistance R 1 to be separated with supplying resistance R2, the power supply filter capacitor C4 of detection signal filter capacitor C2 and application circuit, and one end of power cut-off detection resistance R 1 directly connects one end of alternating current input power supplying.
Embodiment 3
As shown in Figure 3, the 3rd embodiment of the switch-segment light adjusting circuit driving for LED described in the utility model, the power supply of the 3rd embodiment is input as direct current input, without rectifier diode D1～D4, also without supplying resistance and power supply filter capacitor, detect resistance and detection signal filter capacitor without power cut-off, input power is directly inputted to power cut-off testing circuit and detects for power cut-off after K switch 1, be input to simultaneously chip internal to internal circuit to other circuit supply.
As shown in Figure 4, a kind of implementing circuit figure of the switch-segment light adjusting circuit power cut-off cycle-counter circuit driving for LED described in the utility model, determine required d type flip flop number according to required light modulation gear number, if desired n gear needs n d type flip flop.After powering on, VHOLD starts to rise by zero, undervoltage lockout circuit output signal U VLO initial condition is high level, RESET signal initial condition is low level, d type flip flop all resets, Q1～Qn output is zero entirely, and along with the rising of VHOLD, undervoltage lockout circuit output signal U VLO becomes low level from high level, RESET signal becomes high level from low level, and d type flip flop can be accepted POFF signal and count; In the time counting down to last gear, Qn-1 is output as high level, Qn is output as low level, if now carry out again a power-off, action powers on, Qn output becomes high level, RESET output low level resets to all d type flip flops, the full vanishing of Q1～Qn output, electric current when output current can be got back to default conditions again.If do not power on action after power-off in holding time, VHOLD can be reduced to below undervoltage lockout circuit threshold value so, and UVLO exports high level and makes RESET output low level, and all d type flip flops reset, the full vanishing of Q1～Qn output, electric current when output current also can be got back to default conditions.
Fig. 5 is that switch-segment light adjusting circuit output current and the switch motion driving for LED described in the utility model is related to schematic diagram, and this schematic diagram is set as 3 grades of light modulations, and acquiescence output current is maximum current ILED.While initially powering on, be first grade of acquiescence electric current I LED, the output current that powers on for the second time in holding time after power-off for the first time becomes 50% of acquiescence electric current, the output current that powers on for the third time in holding time after power-off is for the second time 20% of acquiescence electric current, interior the 4th output current that powers on of holding time after power-off for the third time becomes again acquiescence electric current I LED, so circulation.
Embodiment of the present utility model, in the time that reality is implemented, also comprises the module that the module of voltage reference is provided, bias current is provided, and the known module of some integrated circuit fields such as internal electric source processing module is described here no longer one by one.
Above embodiment is only specific implementations of the present utility model, but not to restriction of the present utility model, all those skilled in the art make some adjustment and change according to design of the present utility model by analysis ratiocination, be all main idea of the present utility model place, should be considered as within scope of the present utility model.
Claims (2)
1. the switch-segment light adjusting circuit driving for LED, it is characterized in that, described switch-segment light adjusting circuit comprises: a power cut-off testing circuit, for detection voltage (VDET) signal that receives testing circuit is processed to judgement, when after power cut-off, this testing circuit can be exported POFF signal;
One power cut-off cycle-counter circuit, counts the output signal POFF of power cut-off testing circuit, and after power cut-off, is maintained count results Q (n:1);
One maintains voltage generation circuit, maintains voltage (VHOLD) to the power supply of power supply cycle-counter circuit for generation of one;
One voltage maintains electric capacity (C3), and this electric capacity is connected on and maintains between voltage (VHOLD) and ground, maintains voltage (VHOLD) and decline slowly because of electric capacity maintenance effect after power cut-off, powers to power cut-off cycle-counter circuit to maintain certain hour;
One gear selects circuit according to power-off number of times Q (n:1) output one corresponding reference voltage or reference current REF;
One output current control circuit is according to reference voltage or the reference current REF output output current corresponding with Q (n:1);
The output of described power cut-off testing circuit is connected with an input of power cut-off cycle-counter circuit; The described output voltage terminal that maintains voltage generation circuit maintains voltage (VHOLD) end and is connected with the electrical input that supplies of power cut-off cycle-counter circuit, maintain voltage (VHOLD) simultaneously and be connected with the outside positive pole that maintains electric capacity (C3), maintain the minus earth of electric capacity (C3); The count results output of described power cut-off cycle-counter circuit selects the input of circuit to be connected with described gear; Described gear selects the output of circuit and the input of described output current control circuit to be connected.
2. the switch-segment light adjusting circuit driving for LED as claimed in claim 1, is characterized in that: the described switch-segment light adjusting circuit driving for LED also comprises a voltage outage detection resistance (R1), a detection signal filter capacitor (C2) and a voltage stabilizing didoe (ZD1); Described a voltage outage detection resistance (R1), a detection signal filter capacitor (C2), a voltage stabilizing didoe (ZD1) are arranged between testing circuit and power cut-off testing circuit input;
The electric current output cathode of one termination testing circuit of described voltage outage detection resistance (R1), positive pole, the negative pole of voltage stabilizing didoe (ZD1) and the input of power cut-off testing circuit of another termination detection signal filter capacitor (C2) of voltage outage detection resistance (R1), the minus earth of described detection signal filter capacitor (C2), the plus earth of described voltage stabilizing didoe (ZD1).
3. the switch-segment light adjusting circuit driving for LED as claimed in claim 2, it is characterized in that: the described switch-segment light adjusting circuit driving for LED also comprises supplying resistance (R2) and power supply filter capacitor (C4), described supplying resistance (R2), power supply filter capacitor (C4) are arranged at testing circuit input and maintain between voltage generation circuit; It realizes the feeder ear of chip and separating of power cut-off test side.
4. the switch-segment light adjusting circuit driving for LED as claimed in claim 1, is characterized in that: described power cut-off cycle-counter circuit, comprises n d type flip flop of undervoltage lockout circuit and connection.
5. the switch-segment light adjusting circuit driving for LED as claimed in claim 1, is characterized in that: described testing circuit is ac power supply system circuit or the DC power-supply system circuit that contains rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130001.3U CN203801120U (en) | 2014-03-21 | 2014-03-21 | Switch segmented dimming circuit for LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130001.3U CN203801120U (en) | 2014-03-21 | 2014-03-21 | Switch segmented dimming circuit for LED driver |
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| Publication Number | Publication Date |
|---|---|
| CN203801120U true CN203801120U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420130001.3U Expired - Lifetime CN203801120U (en) | 2014-03-21 | 2014-03-21 | Switch segmented dimming circuit for LED driver |
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| CN (1) | CN203801120U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841731A (en) * | 2014-03-21 | 2014-06-04 | 深圳天源中芯半导体有限公司 | Switch piecewise dimming circuit used for LED drive |
-
2014
- 2014-03-21 CN CN201420130001.3U patent/CN203801120U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841731A (en) * | 2014-03-21 | 2014-06-04 | 深圳天源中芯半导体有限公司 | Switch piecewise dimming circuit used for LED drive |
| CN103841731B (en) * | 2014-03-21 | 2016-09-07 | 深圳天源中芯半导体有限公司 | A kind of switch-segment light adjusting circuit driven for LED |
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Granted publication date: 20140827 |