CN206892582U - Low energy consumption auto-induction apparatus - Google Patents
Low energy consumption auto-induction apparatus Download PDFInfo
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- CN206892582U CN206892582U CN201720567374.0U CN201720567374U CN206892582U CN 206892582 U CN206892582 U CN 206892582U CN 201720567374 U CN201720567374 U CN 201720567374U CN 206892582 U CN206892582 U CN 206892582U
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Abstract
The utility model provides a kind of low energy consumption auto-induction apparatus, including：Ambient light detection circuit, for detecting the optical parameter of surrounding environment light, the output of its output end characterizes the ambient light signal of the optical parameter size；Controller, its first input end is connected with the output end of the ambient light detection circuit, the ambient light signal of the ambient light detection circuit output is received, when the difference of the adjacent ambient light signal received twice exceedes given threshold, its output end output enabling signal；Inductor, its input are connected with the output end of the controller, start human testing after receiving the enabling signal, and the output of its output end characterizes whether have the close detection signal of human body.By said apparatus, the purpose for reducing induction installation energy consumption can be played, while expand the range of choice of power supply.
Description
Technical field
It the utility model is related to automatic sensing field, and in particular to a kind of low energy consumption auto-induction apparatus.
Background technology
With the development of science and technology, auto-induction apparatus is more and more perfect, application is also more and more extensive.Using sanitaryware as
Example, auto-induction apparatus can be applied in tap, and when there is user close to tap, auto-induction apparatus can detect human body
It is close, and with other devices coordinate make tap executions it is corresponding action, such as with valve cooperation control water discharge of water faucet.For
Guaranteeing to detect that user's is close in time, auto-induction apparatus need to be detected with higher detection frequency, such as every
0.4s is detected once.
Auto-induction apparatus generally includes an inductor and a controller, wherein, inductor is having detected whether
Human body is close.Common inductor includes infrared inductor, Doppler's inductor, ultrasonic sensing device etc., although different senses
Answer the operation principle of device different, but they power consumption is all higher at work, and need to be detected again with higher detection frequency,
High energy consumption so has not only limited to the selection of power supply, while has also run counter to the energy-saving and emission-reduction that current era is advocated.So
And a kind of auto-induction apparatus is there is no at present, to solve the high energy consumption issues of auto-induction apparatus.
The content of the invention
The utility model aims to solve the problem that the problem of energy consumption of auto-induction apparatus of the prior art is higher.
To solve the above problems, the utility model provides a kind of low energy consumption induction installation, including：
Ambient light detection circuit, for detecting the optical parameter of surrounding environment light, the output of its output end characterizes the optical parameter
The ambient light signal of size；
Controller, its first input end are connected with the output end of the ambient light detection circuit, receive the ambient light inspection
The ambient light signal of slowdown monitoring circuit output, when the difference of the adjacent ambient light signal received twice exceedes given threshold,
Its output end exports enabling signal；
Inductor, its control terminal are connected with the output end of the controller, start human testing after receiving enabling signal,
The output of its output end characterizes whether have the close detection signal of human body.
Further, in above-mentioned low energy consumption auto-induction apparatus：
The ambient light detection circuit is also configured with control terminal, the control terminal of the ambient light detection circuit and the control
The output end connection of device, after receiving the enabling signal, closes the detection of optical parameter.
Further, in above-mentioned low energy consumption auto-induction apparatus：
The controller is also configured with the second input, the second input of the controller and the output of the inductor
End connection, receive the detection signal, when the detection signal characterize do not have human body close to when, the output end of the controller is defeated
Go out shutdown signal；
After the control terminal of the ambient light detection circuit receives the shutdown signal, start the detection of optical parameter；
After the control terminal of the inductor receives the shutdown signal, human testing is closed.
Further, in above-mentioned low energy consumption auto-induction apparatus：
The inductor is the precision ranging chip based on the flight time, including Optical Transmit Unit and light receiving unit：
The light emitting units emitting pulsed light beam, the light receiving unit receive the pulsed light beam of human body reflection；
The time difference that the precision ranging chip is launched and returned according to the light velocity, pulsed light beam obtains human body distance as inspection
Survey signal.
Further, in above-mentioned low energy consumption auto-induction apparatus, the ambient light detection circuit includes：
Photoelectric conversion section, for the optical parameter of ambient light to be converted into current signal, and export and characterize the optical parameter
The current signal of size；
Current Voltage conversion portion, its input are connected with the output end of the photoelectric conversion section, receive the photoelectricity
The current signal of conversion portion output, and the current signal is converted into voltage signal and exported as the ambient light signal,
Its output end is connected as the output end of the ambient light detection circuit with the input of the controller.
Further, in above-mentioned low energy consumption auto-induction apparatus, the photoelectric conversion section includes：
Photodiode, for detecting the brightness value of ambient light, the brightness value of the ambient light is converted into the electric current
Signal, its first end are connected with the first delivery outlet of the controller, and its second end and the second delivery outlet of the controller connect
Connect, when the first delivery outlet of the controller exports high level and the second delivery outlet output low level, the photodiode
Work：
Output end of second end of the photodiode as photoelectric conversion section.
Further, in above-mentioned low energy consumption auto-induction apparatus, the Current Voltage conversion portion includes：
Electric capacity, its first end connect as the input of Current Voltage conversion portion and the output end of the photoelectric conversion section
Connect, its second end ground connection, the potential difference at the first end and second end is the electricity being converted to according to the current signal
Press signal；
The first end also connects as the output end of Current Voltage conversion portion and the analog-to-digital conversion interface of the controller
Connect, when the second delivery outlet of the controller is in high-impedance state, the analog-to-digital conversion interface of the controller is as the defeated of controller
Enter end and receive the ambient light signal.
Further, in above-mentioned low energy consumption auto-induction apparatus, the Current Voltage conversion portion also includes：
Diode, its positive terminal are connected with the second end of the photodiode, its negative pole end and the first of the electric capacity
End connection.
Further, in above-mentioned low energy consumption auto-induction apparatus, the Current Voltage conversion portion also includes：
Resistance, its first end are connected with the second end of the photodiode, its second end ground connection.
Low energy consumption auto-induction apparatus described in the utility model, including ambient light detection circuit, controller and inductor.
Wherein, ambient light detection circuit is used for the optical parameter for detecting surrounding environment light, and the output of its output end characterizes the optical parameter size
Ambient light signal to controller, the difference of the ambient light signal received twice when controller is adjacent exceedes given threshold
When, its output end exports enabling signal to inductor, and inductor starts human testing, and the output of its output end characterizes whether have human body
Close detection signal.By said apparatus, preliminary examination can be carried out to ambient light by ambient light detection circuit, judge whether someone
Body enter, because the power consumption of the power dissipation ratio inductor of ambient light detection circuit is much lower, if ambient light detection circuit with sensing
Device identical detection frequency is detected, and can play the purpose for reducing energy consumption.When the energy consumption of auto-induction apparatus reduces, even if
The less battery of capacity is alternatively working long hours for auto-induction apparatus and provides sufficient electric energy, expands the choosing of power supply
Select scope.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of the low energy consumption auto-induction apparatus described in the utility model embodiment.
Fig. 2 is the principle schematic diagram of the low energy consumption auto-induction apparatus described in the utility model another embodiment.
Fig. 3 is the ambient light detection circuit structural principle of the low energy consumption auto-induction apparatus described in the utility model embodiment
Schematic diagram.
Fig. 4 is that the circuit of the ambient light detection circuit of the low energy consumption auto-induction apparatus described in the utility model embodiment is former
Reason figure.
Wherein, illustrate and be：
1- ambient light detection circuits；11- photoelectric conversion sections；12- Current Voltage conversion portions；2- controllers；3- senses
Device；31- precision ranging chips.
Embodiment
The utility model embodiment is further illustrated below in conjunction with accompanying drawing., it is necessary to say in description of the present utility model
Bright, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be interpreted broadly, for example, can
To be to be fixedly connected or be detachably connected, or it is integrally connected；Can be mechanical connection or electrical connection；Can
It to be to be joined directly together, can also be indirectly connected by intermediary, can be the connection of two component internals.For this area
For those of ordinary skill, concrete meaning of the above-mentioned term in the utility model can be understood with concrete condition.
The utility model provides a kind of low energy consumption auto-induction apparatus, as shown in figure 1, including ambient light detection circuit 1, control
Device 2 and inductor 3 processed.Wherein, ambient light detection circuit 1 is used for the optical parameter for detecting surrounding environment light, its output end output table
The ambient light signal of the optical parameter size is levied, the optical parameter can be the parameters such as light intensity value, brightness value and brightness value, specifically
Depending on which kind of optical parameter is detected by optical detection device.The first input end of controller 2 and the output end of ambient light detection circuit 1
Connection, controller 2 receives the ambient light signal that ambient light detection circuit 1 exports, when the adjacent ambient light received twice
When the difference of signal exceedes given threshold, its output end output enabling signal.The control terminal of inductor 3 and the output of controller 2
End connection, inductor 3 start human testing after receiving the enabling signal of the output of controller 2, and whether its output end output sign
There is the signal that human body is close, wherein the human testing is used to whether detect human body close to auto-induction apparatus, such as pass through inspection
Survey in detection zone and with the presence or absence of human heat determine whether that human body is close, or in detection detection zone object relative to oneself
Whether the distance of dynamic induction installation, which changes, judges whether human body is close.
Specifically, when human body enters in the induction range of above-mentioned low energy consumption auto-induction apparatus, the ambient light meeting of surrounding
Because the entrance of human body changes, such as can cause ambient light to die down after human body has blocked ambient light, then for example work as darkness
Shi Renti, which opens illuminating lamp, can cause ambient light to become strong, and correspondingly, ambient light detection circuit 1 detects the optical parameter of surrounding environment light
Resulting ambient light signal can also change.Controller 2 continuously receives the ambient light letter of the output of ambient light detection circuit 1
Number, when the difference of the adjacent ambient light signal received twice exceedes given threshold, its output end output enabling signal.Its
In, the difference is absolute value, and the given threshold can be set according to the adjacent interval time for receiving ambient light signal twice, when
When interval time is longer, the given threshold can change according to sunshine to be set, such as given threshold was set as in interval time
Sunshine changing value；And when interval time is shorter, given threshold can be set as 0, can also set by sunshine change unobvious
For 10 times of such as precision of ambient light detection circuit 1, to prevent shadow of the measurement accuracy of ambient light detection circuit 1 to judged result
Ring.Inductor 3 receive controller 2 output enabling signal after, start human testing, its output end output characterize whether someone
The close detection signal of body.Controller 2 can receive inductor 3 output detection signal, when judge someone close to when, output signal
Other devices is performed corresponding actions, such as make the valve opening of tap, water discharge of water faucet etc., also can be directly by inductor 3
Make other device actions to other device output signals.By said apparatus, ambient light can be entered by ambient light detection circuit 1
Row preliminary examination, determine whether that human body enters, because the power consumption of the power dissipation ratio inductor 3 of ambient light detection circuit 1 is much lower, if ring
Border optical detection circuit 1 can play the purpose for reducing energy consumption to be detected with the identical of inductor 3 detection frequency.When certainly dynamic
When answering the energy consumption of device to reduce, even if the less battery of capacity is alternatively working long hours for auto-induction apparatus and provides abundance
Electric energy, expand the range of choice of power supply.
Further, the ambient light detection circuit 1 is also configured with control terminal, the control of the ambient light detection circuit 1
End is connected with the output end of the controller 2, after receiving the enabling signal, closes the detection of optical parameter.In actual conditions,
After inductor 3 starts, human testing can be directly performed, now ambient light detection circuit 1 can close the detection to optical parameter, with
Realizing reduces the purpose of energy consumption.And controller 2 is also configured with the second input, the second input of the controller 2 with it is described
The output end connection of inductor 3, receives the detection signal that inductor 3 exports, when the detection signal received all shows non-someone
Body close to when, then controller 3 output end output shutdown signal.The control terminal of ambient light detection circuit 1 receives shutdown signal
Afterwards, start the detection of optical parameter, while after the control terminal of inductor 3 receives shutdown signal, close human testing, reach energy-conservation
Purpose.And ambient light detection circuit 1 detect ambient light while, can continual priming inductor 3, to ensure to work as human body
It can be detected in time when close.
In said apparatus, the inductor 3 can use common for pyroelectric infrared sensor.The rpyroelectric infrared passes
Sensor can detect the infrared ray of human body radiation in the form of non-contact, and be converted into voltage signal.It is described by taking tap as an example
Pyroelectric infrared sensor can using basin scope where tap as detection zone, when have human body close to when, the pyroelectricity
Infrared sensor receives human heat, and then output, which characterizes, the close detection signal of human body.But this kind of inductor easily by
To the interference of other light sources and thermal source, and when the temperature of human body is close with environment temperature, the sensitivity of detection declines.Such as Fig. 2
Shown, the inductor 3 can also use the precision ranging chip 31 based on the flight time, and the chip includes Optical Transmit Unit and light
Receiving unit, light emitting units emitting pulsed light beam, reflected after pulsed light beam runs into human body, light receiving unit receives anti-
Light is penetrated, the time difference by calculating pulsed light beam transmitting and return combines the distance that the light velocity can obtain human body and induction installation, institute
State distance as detection signal.By taking tap as an example, the range finding chip can be using basin scope where tap as detection zone
Domain, when human body is close to basin, range finding chip starts detection, and obtains a distance signal and exported as detection signal to control
Device 2, controller 2 judge whether the distance that detection signal characterizes changes after receiving detection signal, when a change, said
It is bright to have human body close to auto-induction apparatus.In 0.1-2m detection range, its precision can reach precision ranging chip at present
±20mm.Precision ranging chip 31 is applied in the auto-induction apparatus of this programme, is greatly improved the sensitivity of detection, carries
Rise the experience sense of user.
Further, as shown in figure 3, the ambient light detection circuit 1 includes photoelectric conversion section 11 and Current Voltage turns
Change part 12.Wherein photoelectric conversion section 11 is used to the optical parameter of ambient light being converted to current signal, and exports sign beche-de-mer without spike
The current signal of number size, such as common photodiode and phototriode etc. can all be converted to optical parameter electric current letter
Number.Because photoelectric conversion section 11 is used to the optical parameter being converted to current signal, the control of the ambient light detection circuit 1
End may be provided in photoelectric conversion section 11, be easy to start and close the detection of optical parameter.And Current Voltage conversion portion 12
Input is connected with the output end of photoelectric conversion section 11, and Current Voltage conversion portion 12 receives what photoelectric conversion section 11 exported
Current signal, and the current signal is converted into voltage signal, exported the voltage signal as ambient light signal, its is defeated
The output end for going out end as the ambient light detection circuit 1 is connected with the input of the controller 2.Wherein described ambient light letter
Number it is voltage signal, the purpose of the Current Voltage conversion portion 12 is current signal being converted to voltage signal, for control
Device 2 processed identifies that being commonly used in the method for Current Voltage conversion includes integrating circuit, electric resistance partial pressure method etc..
Specifically, as shown in figure 4, photoelectric conversion section 11 can use photodiode U1 to realize.Photodiode U1 is
A kind of semiconductor element for converting light energy into electric energy, the brightness value for detecting ambient light to be used in this programme, and brightness value is turned
It is changed to the current signal.Photodiode U1 is as a kind of passive sensing device, itself not consumed energy, therefore compared to
Zero-energy consumption can be achieved for other light-sensitive elements, and its tube core is a PN junction with photosensitive feature, has and unidirectionally leads
Electrically, backward voltage need to be added during work.In this programme, the first of photodiode U1 first end and the controller 2 is defeated
Outlet connection, its second end are connected with the second delivery outlet of the controller 2, when the first delivery outlet of the controller 2 exports
It is when high level and the second delivery outlet output low level, i.e., described photosensitive when controller 2 provides backward voltage for photodiode U1
Diode U1 works, and starts to detect the brightness value of surrounding environment light.Photodiode U1 the second end is also used as photoelectric conversion part
Divide 11 output end output current signal, and be connected with the input of the Current Voltage conversion portion 12.And work as the control
The first delivery outlet output low level of device 2 and the second delivery outlet is when being in high-impedance state, the photodiode U1 is stopped.Therefore light
Quick diode U1 first end and the second end can be as the control terminals of photoelectric conversion section 11, and the first delivery outlet of controller 2
Can be as the output end of controller 2, to control photodiode U1 opening and closing with the second delivery outlet.Wherein, it is described
The first delivery outlet and the second delivery outlet of controller 2 are the I/O mouths of controller 2.
Current Voltage conversion portion 12 is as shown in figure 4, can use electric capacity C1 to realize, the electric capacity C1 is used for the photoelectricity
The current signal that conversion portion 11 exports is converted to ambient light signal, input of its first end as Current Voltage conversion portion 12
End is connected with the output end of the photoelectric conversion section 11, to receive the current signal of the output of photoelectric conversion section 11 and deposit
The potential difference at storage, its second end ground connection, the first end and the second end is that the voltage being converted to according to the current signal is believed
Number.The first end is also connected as the output end of Current Voltage conversion portion 12 with the analog-to-digital conversion interface of the controller 2,
When the second delivery outlet of the controller 2 is in high-impedance state, i.e., photoelectric conversion section 11 completes one-time detection and electric capacity C1 is complete
Into current signal reception and conversion when, described in the analog-to-digital conversion interface of the controller 2 is received as the input of controller 2
Ambient light signal.Such scheme also is understood as, when the first output port of the controller 2 exports low level and the second output
When port is in high-impedance state, the analog-to-digital conversion interface of the controller 2 receives the ambient light letter as the input of controller 2
Number.After ambient light signal is received, ambient light signal is converted to data signal by the analog-digital converter built in controller 2, with
Identified for controller 2.After the analog-to-digital conversion interface of controller 2 reads ambient light signal, switch to low level, in this way, can be by electricity
Hold the electricity release stored in C1, changed with carrying out Current Voltage next time.To prevent the high configuration of the second delivery outlet of controller 2
When electric capacity C1 storage reverse direction current flow, as shown in figure 4, can be gone here and there between the output end of photoelectric conversion section 11 and electric capacity C1
Join a diode D1, the positive terminal of the diode D1 is connected with the output end of photoelectric conversion section 11, i.e., with photosensitive two pole
Pipe U1 the second end connection, its negative pole end are connected with the first end of the electric capacity C1.In addition, can also be in parallel at electric capacity C1 both ends
One resistance R2, to reach the purpose of shunting, it is ensured that the electric current of electric capacity C1 storages is not up to saturation, specifically, resistance R2
First end be connected with the output end of the photoelectric conversion section 11, i.e., be connected with photodiode U1 the second end, it second
End ground connection.
Finally it should be noted that：Controller 2 described above can combine conventional journey by single-chip microcomputer or PLD
Sequence realization, the improvement not being related in program.Above example is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to the foregoing embodiments, one of ordinary skill in the art should manage
Solution：It can still be modified to the technical scheme described in foregoing embodiments, or which part technical characteristic is entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the utility model
The spirit and scope of technical scheme.
Claims (9)
- A kind of 1. low energy consumption auto-induction apparatus, it is characterised in that including：Ambient light detection circuit, for detecting the optical parameter of surrounding environment light, the output of its output end characterizes the optical parameter size Ambient light signal；Controller, its first input end are connected with the output end of the ambient light detection circuit, receive the ambient light detection electricity The ambient light signal of road output, when the difference of the adjacent ambient light signal received twice exceedes given threshold, its is defeated Go out end output enabling signal；Inductor, its control terminal are connected with the output end of the controller, start human testing after receiving the enabling signal, The output of its output end characterizes whether have the close detection signal of human body.
- 2. low energy consumption auto-induction apparatus according to claim 1, it is characterised in that：The ambient light detection circuit is also configured with control terminal, the control terminal of the ambient light detection circuit and the controller Output end connects, and after receiving the enabling signal, closes the detection of optical parameter.
- 3. low energy consumption auto-induction apparatus according to claim 2, it is characterised in that：The controller is also configured with the second input, and the second input of the controller connects with the output end of the inductor Connect, receive the detection signal, when the detection signal characterize do not have human body close to when, the controller output end output close Close signal；After the control terminal of the ambient light detection circuit receives the shutdown signal, start the detection of optical parameter；After the control terminal of the inductor receives the shutdown signal, human testing is closed.
- 4. according to the low energy consumption auto-induction apparatus described in claim any one of 1-3, it is characterised in that：The inductor is the precision ranging chip based on the flight time, including Optical Transmit Unit and light receiving unit：The light emitting units emitting pulsed light beam, the light receiving unit receive the pulsed light beam of human body reflection；The time difference that the precision ranging chip is launched and returned according to the light velocity, pulsed light beam obtains human body distance as detection letter Number.
- 5. according to the low energy consumption auto-induction apparatus described in claim any one of 1-3, it is characterised in that the ambient light detection Circuit includes：Photoelectric conversion section, for the optical parameter of ambient light to be converted into current signal, and export and characterize the optical parameter size Current signal；Current Voltage conversion portion, its input are connected with the output end of the photoelectric conversion section, receive the opto-electronic conversion The current signal of part output, and the current signal is converted into voltage signal and exported as the ambient light signal, its is defeated The output end for going out end as the ambient light detection circuit is connected with the input of the controller.
- 6. low energy consumption auto-induction apparatus according to claim 5, it is characterised in that the photoelectric conversion section includes：Photodiode, for detecting the brightness value of ambient light, the brightness value of the ambient light is converted into the current signal, Its first end is connected with the first delivery outlet of the controller, and its second end is connected with the second delivery outlet of the controller, when When the first delivery outlet output high level and the second delivery outlet output low level of the controller, the photodiode work；Output end of second end of the photodiode as photoelectric conversion section.
- 7. low energy consumption auto-induction apparatus according to claim 6, it is characterised in that the Current Voltage converter section subpackage Include：Electric capacity, its first end are connected as the input of Current Voltage conversion portion with the output end of the photoelectric conversion section, Its second end is grounded, and the potential difference at the first end and second end is that the voltage being converted to according to the current signal is believed Number；The first end is also connected as the output end of Current Voltage conversion portion with the analog-to-digital conversion interface of the controller, when When second delivery outlet of the controller is in high-impedance state, the analog-to-digital conversion interface of the controller terminates as the input of controller Receive the ambient light signal.
- 8. low energy consumption auto-induction apparatus according to claim 7, it is characterised in that the Current Voltage conversion portion is also Including：Diode, its positive terminal are connected with the second end of the photodiode, and the first end of its negative pole end and the electric capacity connects Connect.
- 9. low energy consumption auto-induction apparatus according to claim 8, it is characterised in that the Current Voltage conversion portion is also Including：Resistance, its first end are connected with the second end of the photodiode, its second end ground connection.
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| CN201720567374.0U CN206892582U (en) | 2017-05-19 | 2017-05-19 | Low energy consumption auto-induction apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108537896A (en) * | 2017-05-04 | 2018-09-14 | 绿创新科技股份有限公司 | Parking charging system and operation method thereof |
| CN109062081A (en) * | 2018-06-25 | 2018-12-21 | 厦门建霖健康家居股份有限公司 | A kind of energy conservation induction system and method |
| CN109188452A (en) * | 2018-08-22 | 2019-01-11 | 上海炬佑智能科技有限公司 | Flight time distance measuring sensor and its modulation of source method |
| CN113126067A (en) * | 2019-12-26 | 2021-07-16 | 华为技术有限公司 | Laser safety circuit and laser safety equipment |
| WO2021196509A1 (en) * | 2020-04-01 | 2021-10-07 | 日立楼宇技术（广州）有限公司 | Contactless key and control method therefor |
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2017
- 2017-05-19 CN CN201720567374.0U patent/CN206892582U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108537896A (en) * | 2017-05-04 | 2018-09-14 | 绿创新科技股份有限公司 | Parking charging system and operation method thereof |
| CN108537896B (en) * | 2017-05-04 | 2020-11-24 | 绿创新科技股份有限公司 | Parking charging system and operation method thereof |
| CN109062081A (en) * | 2018-06-25 | 2018-12-21 | 厦门建霖健康家居股份有限公司 | A kind of energy conservation induction system and method |
| CN109188452A (en) * | 2018-08-22 | 2019-01-11 | 上海炬佑智能科技有限公司 | Flight time distance measuring sensor and its modulation of source method |
| CN109188452B (en) * | 2018-08-22 | 2021-07-23 | 上海炬佑智能科技有限公司 | Time-of-flight ranging sensor and light source modulation method thereof |
| CN113126067A (en) * | 2019-12-26 | 2021-07-16 | 华为技术有限公司 | Laser safety circuit and laser safety equipment |
| WO2021196509A1 (en) * | 2020-04-01 | 2021-10-07 | 日立楼宇技术（广州）有限公司 | Contactless key and control method therefor |
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| GR01 | Patent grant |