CN205092838U - Light projector circuit and contain its photoelectric switch - Google Patents
Light projector circuit and contain its photoelectric switch Download PDFInfo
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- CN205092838U CN205092838U CN201520356157.8U CN201520356157U CN205092838U CN 205092838 U CN205092838 U CN 205092838U CN 201520356157 U CN201520356157 U CN 201520356157U CN 205092838 U CN205092838 U CN 205092838U
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Abstract
The utility model discloses a light projector circuit and contain its photoelectric switch. This light projector circuit includes: pulse height selector, including two at least inputs with select the end, receive at least two ranges of waiting to select respectively and select results, pulse height selector is according to selecting the result to select one of them range as the light projector pulse from at least two ranges of waiting to select, electronic switch, the electrical property is coupled in pulse height selector for according to the range of the light projector pulse selected, export the voltage of corresponding amplitude, voltage current conversion circuit, the electrical property is coupled in electronic switch for voltage conversion that will this corresponding range becomes the electric current of corresponding intensity, and electricity / light converting circuit, the electrical property is coupled in voltage / electric current converting circuit for electric current according to the output of voltage current conversion circuit carries out the lightning conversion. The range of light projector circuit can be selected to this light projector circuit, has reduced the average current of light projector circuit to system power dissipation has been reduced.
Description
Technical field
The utility model relates to photoelectric sensor field, particularly relates to a kind of light projector circuit of low-power consumption and comprises its optoelectronic switch.
Background technology
Nowadays, along with the continuous progress of science and technology, low-power consumption product becomes the development trend of future products.And along with product sensor is to the development of networking and wireless penetration, the demand for low-power consumption photoelectric sensor also constantly increases.In networked instruments, the low-power consumption photoelectric sensor as terminal node can reduce bus load; And in wireless penetration application, low-power consumption photoelectric sensor can also extend the operating time of battery.
Figure 1A-1C is respectively the schematic diagram of existing several light projector pulse.Wherein, Figure 1A shows common light projector impulse waveform.Figure 1B and Fig. 1 C respectively illustrates the light projector impulse waveform of two kinds of power savings.In figure ia, cycle of light projector pulse and width all remain unchanged; In fig. ib, the cycle of light projector pulse can be subject to the modulation of light signal and different; And in fig. 1 c, cycle and the width of light projector pulse all can be subject to the modulation of light signal and different.But kind of the light projector pulse of three shown in Figure 1A-1C, in whole luminescence process, its amplitude is constant.And the amplitude of light projector pulse can embody control voltage or flow through the size of electric current of light-emitting diode, also namely can control light projector energy by the amplitude of modulation light projector pulse, thus reach the object reducing power consumption.
Utility model content
In view of this, the utility model aims to provide and a kind ofly can select the low-power consumption light projector circuit of light projector pulse amplitude and comprise its optoelectronic switch.
Additional aspect of the present utility model and advantage will partly be set forth in the following description, and partly will become obvious from description, or can the acquistion by practice of the present utility model.
The utility model provides a kind of light projector circuit be applied in optoelectronic switch on the one hand, comprise: pulse-height selector, comprise: at least two inputs and selecting side, receive at least two amplitudes to be selected and selection result respectively, the amplitude of one of them light projector pulse produced as described light projector circuit selected by described pulse-height selector from described at least two amplitudes to be selected according to described selection result; Electronic switch, is electrically coupled to described pulse-height selector, for the amplitude of described light projector pulse selected according to described pulse-height selector, exports the voltage of respective magnitudes; Voltage/current conversion circuit, is electrically coupled to described electronic switch, for the voltage transitions of described respective magnitudes being become the electric current of respective strengths; And electrical/optical change-over circuit, be electrically coupled to described voltage/current conversion circuit, carry out electro-optic conversion for the electric current exported according to described voltage/current conversion circuit.
In an embodiment, light projector circuit also comprises selection control, is electrically coupled to the described selecting side of described pulse-height selector, thinks that described pulse-height selector provides described selection result; Described selection control comprises: comparator, for comparing light signal voltage value and a voltage threshold; Trigger, is electrically coupled to described comparator; And logical device, be electrically coupled to described trigger; Wherein, described trigger is according to the enable described logical device of the comparative result of described comparator, and described logical device is according to the mode of operation of the described optoelectronic switch of input and judge that cycle start bit mark provides described selection result.
In another embodiment, the light signal voltage value that first light projector pulse that described comparator is used for described light projector circuit generation in the more described judgement cycle produces and described voltage threshold, described pulse-height selector is for selecting described second of the generation of light projector circuit and the amplitude of later light projector pulse in the described judgement cycle.
In an embodiment again, described comparator is used for light signal voltage value that a light projector pulse that more described light projector circuit produces produces and described voltage threshold, and described pulse-height selector is for selecting the amplitude of the light projector pulse after this light projector pulse.
In an embodiment again, the mode of operation of described optoelectronic switch comprises: normal shading patterns to be and often enter optical mode.
In an embodiment again, described trigger is edge triggered flip flop.
In an embodiment again, described at least two inputs comprise first input end and the second input, receive at least two amplitudes to be selected respectively.
In an embodiment again, described first input end receives the amplitude peak of the light projector pulse that described light projector circuit can produce, and described second input receives the half of described amplitude peak.
In an embodiment again, described electronic switch is also for modulating width and the cycle of described light projector pulse.
The utility model provides a kind of optoelectronic switch on the other hand, comprises any one light projector circuit above-mentioned.
The light projector circuit that the utility model provides can select the amplitude of light projector circuit, reduces the average current of light projector circuit, thus reduces system power dissipation.Further, the light projector circuit that the utility model provides can also carry out pulse amplitude modulation, to select the different amplitudes of light projector circuit according to the energy by light signal.In addition, this light projector circuit can also be deposited is used as anti-saturation countermeasure purely, reduces the saturated phenomenon by light signal, thus improves the accuracy of detection of photoelectric sensor.
Accompanying drawing explanation
Describe its example embodiment in detail by referring to accompanying drawing, above-mentioned and further feature of the present utility model and advantage will become more obvious.
Figure 1A-1C is respectively the schematic diagram of existing several light projector pulse.
Fig. 2 is the structural representation of the light projector circuit according to an embodiment of the present utility model.
Fig. 3 is the structural representation of the light projector circuit according to another embodiment of the present utility model.
The schematic diagram of the light projector pulse that the light projector circuit applying existing power saving under Fig. 4 A and Fig. 4 B is respectively normal shading patterns to be is launched with application light projector circuit of the present utility model.
The schematic diagram of the light projector pulse that Fig. 5 A and Fig. 5 B applies existing power saving light projector circuit under being respectively and often entering optical mode is launched with application light projector circuit of the present utility model.
Embodiment
More fully example embodiment is described referring now to accompanying drawing.But example embodiment can be implemented in a variety of forms, and should not be understood to be limited to execution mode set forth herein; On the contrary, these execution modes are provided to make the utility model comprehensively with complete, and the design of example embodiment will be conveyed to those skilled in the art all sidedly.Reference numeral identical in the drawings represents same or similar structure, thus will omit the repeated description to them.
Described feature, structure or characteristic can be combined in one or more execution mode in any suitable manner.In the following description, provide many details thus provide fully understanding execution mode of the present utility model.But one of ordinary skill in the art would recognize that, what do not have in described specific detail is one or more, or adopts other method, constituent element etc., also can put into practice the technical solution of the utility model.In other cases, be not shown specifically or describe known features or operate to avoid fuzzy the utility model.
Fig. 2 is the structural representation of the light projector circuit according to an embodiment of the present utility model.As shown in Figure 2, light projector circuit 1 comprises: pulse-height selector 10, electronic switch 12, voltage/current (V/I) change-over circuit 14 and electrical/optical change-over circuit 16.
Pulse-height selector 10 comprises at least two inputs and a selecting side, is respectively used to receive different amplitude inputs and selection result.Pulse-height selector 10, according to the selection result received from selecting side, chooses an amplitude as output from the different amplitudes that at least two inputs receive.
As shown in Figure 2, for two kinds of selectable amplitudes, pulse-height selector 10 is such as one or two input analog amount selector.Two inputs are respectively Ipt_1 and Ipt_2, and wherein Ipt_1 such as inputs the amplitude peak V of the light projector pulse that light projector circuit 1 can produce
lED, Ipt_2 such as inputs the amplitude peak V of 1/2nd
lED.Pulse-height selector 10, according to the input of selecting side Sel, chooses the amplitude that it exports from Ipt_1 and Ipt_2.If the input instruction of selecting side Sel is with amplitude peak V
lEDlight projector, then select the amplitude from Ipt_1 input; Otherwise, select the amplitude from Ipt_2 input.
Electronic switch 12 electric property coupling pulse-height selector 10, for the amplitude of the light projector pulse selected by pulse-height selector 10, exports the voltage of respective magnitudes.
Voltage/current conversion circuit 14 is electrically coupled to electronic switch 12, and the voltage transitions for the respective magnitudes exported by electronic switch 12 becomes the electric current of respective strengths.
Electrical/optical change-over circuit 16 is electrically coupled to voltage/current conversion circuit 14, carries out opto-electronic conversion for the electric current exported according to voltage/current conversion circuit 14, to carry out light projector.Electrical/optical change-over circuit 16 is such as light-emitting diode, but the utility model is not as example.
In certain embodiments, electronic switch 12 is also for modulating width and the cycle of light projector pulse.Also by light projector circuit 1 for launching the light projector impulse waveform of the power saving as shown in Figure 1B or 1C.
The light projector circuit 1 that the utility model provides can select the amplitude of light projector circuit, reduces the average current of light projector circuit, thus reduces system power dissipation.
Fig. 3 is the structural representation of the light projector circuit according to another embodiment of the present utility model.With the light projector circuit 1 shown in Fig. 2 unlike, the light projector circuit 2 shown in Fig. 3 also comprises selection control 18 further, is electrically coupled to the selecting side Sel of pulse-height selector 10, thinks that pulse-height selector 10 provides selection result.Wherein, selection control 18 comprises: comparator 182, trigger 184 and logical device 186.
Wherein comparator 182 is for comparing light signal voltage value and a voltage threshold V
tH2, voltage threshold V
tH2be such as one close to saturated signal level.Trigger 184 is electrically coupled to comparator 182, be that an edge triggered flip flop illustrates, but the utility model is not as limit, when light signal voltage value is greater than voltage threshold V for trigger 184
tH2time, comparator 182 exports a rising edge, thus enters logical device 186 by trigger 184 locking.The input variable of logical device 186 comprise by the amplitude of light signal, optoelectronic switch mode of operation (such as normal shading patterns to be or often enter optical mode) and judge the identification light of cycle (JudgeCycle) start bit, logical device 186 passes through computing, select the amplitude of light projector pulse, be pulse-height selector 10 export selected results.In light projector circuit 2, other parts are identical with other parts in light projector circuit 1, do not repeat them here.
Below, respectively with normal shading patterns to be with often enter optical mode, illustrate the system of selection of the pulse amplitude be applied in selection control 18, but the utility model is not as example, selection control 18 can also select other pulse amplitude system of selection, thus the magnitude of voltage be reached through by light signal carrys out the object of modulating pulse amplitude.
The schematic diagram of the light projector pulse that the light projector circuit applying existing power saving under Fig. 4 A and Fig. 4 B is respectively normal shading patterns to be is launched with application light projector circuit of the present utility model.Normal shading patterns to be refers to diffusion reflection pattern, sometimes also becomes scattered reflection type.When occurring specifically for not having object, the light of light projector impulse ejection can not enter light receiving circuit; And when there being object to occur, the light of reflections off objects light projector pulse enters light receiving circuit, thus produce by light signal.
The schematic diagram of the light projector pulse that the light projector circuit that Fig. 4 A is the existing power saving of application is launched.In this light projector circuit, the cycle of light projector pulse and width are subject to the modulation of light signal.Light projector impulse waveform is divided into sleep cycle (SleepCycle) and judges the cycle.When not having reverberation to enter, light projector pulse is in sleep cycle.In sleep cycle, transmission interval (the i.e. cycle T of light projector pulse of light projector pulse
1) larger.And when there being reverberation to enter, light projector pulse enters the radiation pattern in judgement cycle.In the judgement cycle, transmission interval (the i.e. cycle T of light projector pulse of light projector pulse
2) diminish, usually within the judgement cycle, light projector circuit is with cycle T
2send 4 or 8 light projector pulses (with 4 light projector pulse signals in figure), but the utility model is not as limit.Within the judgement cycle, detect that (as 1 in figure feels the pulse punching, width is W in first light projector pulse
1) magnitude of voltage by light signal that produces exceedes voltage threshold V
tH1, the width W of the light projector pulse (as No. 4 light projector pulse of 2,3, in figure) after judging in the cycle
2reduce, to reach the object of power saving.
The schematic diagram of the light projector pulse that Fig. 4 B launches for application light projector circuit 2 of the present utility model.As can be seen from the figure, in the judgement cycle, first light projector pulse (as 1 in figure feels the pulse punching) that light projector circuit 2 produces the light signal voltage value that produces exceed voltage threshold V
tH2(be such as one close to saturated signal level), illustrates that radiative energy is very strong, then second that reduces that in the judgement cycle, light projector circuit 2 produces and after the amplitude of light projector pulse of (as 2,3, in figure No. 4).If the amplitude peak V of the light projector pulse that the amplitude of first light projector pulse in the judgement cycle can produce for light projector circuit 2
lED, then the amplitude of the light projector pulse after reducing is 1/N V doubly
lED, wherein preferred N=2, i.e. amplitude peak V
lEDhalf.Compared to the light projector pulse shown in Fig. 4 A, the light projector pulse that light projector circuit 2 of the present utility model produces, reduce further the average current of light projector, thus reduces system power dissipation.
The schematic diagram of the light projector pulse that Fig. 5 A and Fig. 5 B applies existing power saving light projector circuit under being respectively and often entering optical mode is launched with application light projector circuit of the present utility model.Often entering optical mode refers to when not having object to occur, the light that optoelectronic switch is launched by the reflection receivable oneself of reflecting plate.And when there being object to occur, having blocked light path and not received the light oneself sent, thus detect the existence of object.
The schematic diagram of the light projector pulse that the light projector circuit that Fig. 5 A is the existing power saving of application is launched.In this light projector circuit, the waveform of the light projector pulse that it produces also is divided into sleep cycle and judgement cycle.In sleep cycle, similarly the light projector pulse period is T
1, because do not have object to block, the magnitude of voltage by light signal is very strong.And when occurring that object blocks, light projector pulse enters the judgement cycle, and the pulse period becomes T
2, namely transmission interval diminishes.When detecting that (as 1 in figure feels the pulse punching, width is W in the first light projector pulse
1) magnitude of voltage by light signal that produces is reduced to voltage threshold V
tH1time following, reduce the width W of succeeding impulse (as No. 4 light projector pulse of 2,3, in figure) in the judgement cycle
2, to reach the object of power saving.The judgement cycle is usually with cycle T
2launch 4 or 8 pulses (with 4 light projector pulse signals in figure), but the utility model is not as limit.
The schematic diagram of the light projector pulse that Fig. 5 B launches for application light projector circuit 2 of the present utility model.As shown in Figure 5 B, when not having object to occur, if the energy of reverberation is sufficient, the magnitude of voltage by light signal that light projector pulse (as 1 in figure feels the pulse punching) produces has exceeded voltage threshold V
tH2(be such as one close to saturated signal level), then reduce the amplitude of follow-up light projector (as 2 in figure, 3,4,5 feels the pulse punching) pulse.If cause light signal voltage value more than V
tH2the amplitude of the light projector pulse amplitude peak V of light projector pulse that can produce for light projector circuit 2
lED, then the amplitude of the light projector pulse after reducing is 1/N V doubly
lED, wherein preferred N=2, i.e. amplitude peak V
lEDhalf.In addition, the misoperation caused because dust, emitting led light quantity decay in order to ensure.Judging that first light projector pulse after end cycle (as 6 in figure feels the pulse punching) is always with amplitude peak V
lEDluminous.Compared to the light projector pulse shown in Fig. 5 A, the light projector pulse that light projector circuit 1 of the present utility model produces, reduce further the average current of light projector, thus reduces system power dissipation.
The light projector circuit 2 that the utility model provides can carry out pulse amplitude modulation according to the energy by light signal further, to select the different amplitudes of light projector circuit.
In addition, this light projector circuit can also be deposited is used as anti-saturation countermeasure purely, reduces the saturated phenomenon by light signal, thus improves the accuracy of detection of photoelectric sensor, such as improve the region closely cannot detected, and carry out 10 microseconds (us) level high speed detection etc.
Below illustrative embodiments of the present utility model is illustrate and described particularly.Should be appreciated that, the utility model is not limited to disclosed execution mode, and on the contrary, the utility model intention contains the various amendment and equivalent replacement that comprise within the scope of the appended claims.
Claims (10)
1. be applied to the light projector circuit in optoelectronic switch, it is characterized in that, comprising:
Pulse-height selector, comprise: at least two inputs and selecting side, receive at least two amplitudes to be selected and selection result respectively, the amplitude of one of them light projector pulse produced as described light projector circuit selected by described pulse-height selector from described at least two amplitudes to be selected according to described selection result;
Electronic switch, is electrically coupled to described pulse-height selector, for the amplitude of described light projector pulse selected according to described pulse-height selector, exports the voltage of respective magnitudes;
Voltage/current conversion circuit, is electrically coupled to described electronic switch, for the voltage transitions of described respective magnitudes being become the electric current of respective strengths; And
Electrical/optical change-over circuit, is electrically coupled to described voltage/current conversion circuit, carries out electro-optic conversion for the electric current exported according to described voltage/current conversion circuit.
2. light projector circuit according to claim 1, is characterized in that, also comprise selection control, is electrically coupled to the described selecting side of described pulse-height selector, thinks that described pulse-height selector provides described selection result; Described selection control comprises:
Comparator, for comparing light signal voltage value and a voltage threshold;
Trigger, is electrically coupled to described comparator; And
Logical device, is electrically coupled to described trigger;
Wherein, described trigger is according to the enable described logical device of the comparative result of described comparator, and described logical device is according to the mode of operation of the described optoelectronic switch of input and judge that cycle start bit mark provides described selection result.
3. light projector circuit according to claim 2, it is characterized in that, the light signal voltage value that first light projector pulse that described comparator is used for described light projector circuit generation in the more described judgement cycle produces and described voltage threshold, described pulse-height selector is for selecting described second of the generation of light projector circuit and the amplitude of later light projector pulse in the described judgement cycle.
4. light projector circuit according to claim 2, it is characterized in that, the light signal voltage value that the light projector pulse that described comparator is used for the generation of more described light projector circuit produces and described voltage threshold, described pulse-height selector is for selecting the amplitude of the light projector pulse after this light projector pulse.
5. light projector circuit according to claim 2, is characterized in that, the mode of operation of described optoelectronic switch comprises: normal shading patterns to be and often enter optical mode.
6. light projector circuit according to claim 2, is characterized in that, described trigger is edge triggered flip flop.
7. light projector circuit according to claim 1, is characterized in that, described at least two inputs comprise first input end and the second input, the amplitude that reception two is to be selected respectively.
8. light projector circuit according to claim 7, is characterized in that, described first input end receives the amplitude peak of the light projector pulse that described light projector circuit can produce, and described second input receives the half of described amplitude peak.
9. light projector circuit according to claim 1, is characterized in that, described electronic switch is also for modulating width and the cycle of described light projector pulse.
10. an optoelectronic switch, is characterized in that, comprises the light projector circuit described in any one of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520356157.8U CN205092838U (en) | 2015-05-28 | 2015-05-28 | Light projector circuit and contain its photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520356157.8U CN205092838U (en) | 2015-05-28 | 2015-05-28 | Light projector circuit and contain its photoelectric switch |
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| Publication Number | Publication Date |
|---|---|
| CN205092838U true CN205092838U (en) | 2016-03-16 |
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| CN201520356157.8U Active CN205092838U (en) | 2015-05-28 | 2015-05-28 | Light projector circuit and contain its photoelectric switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312342A (en) * | 2019-06-28 | 2019-10-08 | 上海索迪龙自动化有限公司 | The light projector of photoelectric sensor adjusts system |
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2015
- 2015-05-28 CN CN201520356157.8U patent/CN205092838U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312342A (en) * | 2019-06-28 | 2019-10-08 | 上海索迪龙自动化有限公司 | The light projector of photoelectric sensor adjusts system |
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