CN213073186U - Visible light indoor positioning device - Google Patents
Visible light indoor positioning device Download PDFInfo
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- CN213073186U CN213073186U CN202021525800.2U CN202021525800U CN213073186U CN 213073186 U CN213073186 U CN 213073186U CN 202021525800 U CN202021525800 U CN 202021525800U CN 213073186 U CN213073186 U CN 213073186U
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Abstract
The utility model provides an indoor positioner of visible light, include: power supply, constant current drive circuit, current-limiting circuit, DC/DC converting circuit, control chip, voltage stabilizing circuit and light orientation module, light orientation module includes: the constant current driving circuit comprises a signal processing circuit, a control switch and a light-emitting device, wherein the output end of the constant current driving is respectively connected with one end of a current limiting circuit and one end of the light-emitting device, and the other end of the light-emitting device is connected with the second end of the control switch; the other end of the current limiting circuit is connected with the voltage input end of the DC/DC conversion circuit; the voltage output end of the DC/DC conversion circuit is respectively connected with the input pin of the control chip and the input end of the signal processing circuit; the output pin of the control chip is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the output end of the voltage stabilizing circuit; the input end of the voltage stabilizing circuit is connected with the output end of the constant current drive, and the output end of the voltage stabilizing circuit is also connected with the control end of the control switch, so that the control switch is in a continuous conducting state after being electrified.
Description
Technical Field
The utility model relates to a LED lighting technology field, concretely relates to indoor positioner of visible light.
Background
The visible light positioning device realizes indoor positioning in a communication mode of using light waves as transmission coal quality, the light waves and radio waves are electromagnetic waves, and the light waves have the advantages of wide transmission frequency band, large communication capacity, strong anti-interference capability and the like. The light waves can be divided into infrared waves, visible light and ultraviolet light according to the length of the wavelength. Visible light LED is used as a light source for visible light indoor positioning, so that indoor positioning is realized, and specifically, position information to be transmitted is firstly coded into a digital signal; the digital signal is then used to modulate the duration or frequency of the drive current or drive voltage of the light source, causing the light source to flash at high frequency, which is then decoded with a light receiving device to achieve indoor visible light positioning.
In the related art, as shown in fig. 1, at an instant of power-on, ac power is converted into dc power by a constant current source and directly flows to the positive electrode of the lamp and the negative electrode of the lamp, and since Q1 is in a cut-off state when power is off and VGS is 0V, after power-on, VDS is turned on>0, at this time IDWhen the voltage of the negative end of the LDE lamp is increased sharply, the LED lamp is turned on and then turned off, and the LED is turned on again after the follow-up components of the single chip microcomputer work. Such a phenomenon may cause a discontinuous working state of the module, and may cause damage to components and lamps even if the module is operated for a long time.
SUMMERY OF THE UTILITY MODEL
To solve the above technical problem, the utility model provides a visible light indoor positioner, it is direct continuous with constant current drive's output through the input with voltage stabilizing circuit to make control openThe switch is in a continuous conduction state after being powered on, and avoids IDThe situation that lamps flicker in succession due to large voltage occurs, and the service life of the lamps is prolonged.
The utility model adopts the technical scheme as follows:
a visible light indoor positioning device comprising: power supply, constant current drive circuit, current-limiting circuit, DC/DC converting circuit, control chip, voltage stabilizing circuit and light orientation module, light orientation module includes: the constant current driving circuit comprises a signal processing circuit, a control switch and a light-emitting device, wherein the output end of the power supply is connected with the input end of the constant current driving circuit; the output end of the constant current drive is respectively connected with one end of the current limiting circuit and one end of the light-emitting device, the other end of the light-emitting device is connected with the second end of the control switch, and the first end of the control switch is grounded; the other end of the current limiting circuit is connected with a voltage input end of the DC/DC conversion circuit; the voltage output end of the DC/DC conversion circuit is respectively connected with the input pin of the control chip and the input end of the signal processing circuit; a signal output pin of the control chip is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the output end of the voltage stabilizing circuit; the input end of the voltage stabilizing circuit is connected with the output end of the constant current driving circuit, and the output end of the voltage stabilizing circuit is also connected with the control end of the control switch, so that the control switch is in a continuous conducting state after being electrified.
Specifically, the current limiting circuit includes: the circuit comprises a first resistor and a second resistor which are connected in parallel, wherein one end of the first resistor and one end of the second resistor which are connected in parallel are connected with the output end of the constant current driving circuit, the other end of the first resistor and the other end of the second resistor which are connected in parallel are connected with the input end of the DC/DC conversion circuit, and the resistance values of the first resistor and the second resistor are both 2K.
Specifically, the current limiting circuit includes: and one end of the third resistor is connected with the first output end of the constant current driving circuit, the other end of the third resistor is connected with the input end of the DC/DC conversion circuit, and the resistance value of the third resistor is 1K.
Specifically, the DC/DC conversion circuit includes: the voltage input end of the DC/DC conversion chip is connected with the other ends of the first resistor and the second resistor which are connected in parallel, or the voltage input end of the DC/DC conversion chip is connected with the other end of the third resistor; and the output end of the DC/DC conversion chip is connected with the input pin of the control chip.
Specifically, the model of the DC/DC conversion chip is LPD3201, and the model of the control chip is STC15F 104W.
Specifically, the signal processing circuit includes: the control end of the first triode is connected with the output end of the DC/DC conversion chip, and the first end of the first triode is grounded; the control end of the second triode is connected with the signal output pin of the control chip, the first end of the second triode is connected with the second end of the first triode, and the second end of the second triode is connected with the output end of the voltage stabilizing circuit; and one end of the fourth resistor is connected with an output pin of the control chip, and the other end of the fourth resistor is connected with a power supply output end of the DC/DC conversion chip.
Specifically, the voltage stabilizing circuit comprises: one end of the fifth resistor is connected with the output end of the constant current driving circuit, and the other end of the fifth resistor is connected with the second end of the second triode; and one end of the sixth resistor is connected with the other end of the fifth resistor, the other end of the sixth resistor is grounded, a first node is arranged between the fifth resistor and the sixth resistor, and the first node is connected with the control end of the control switch.
Specifically, the control switch is an MOS transistor.
Specifically, the light emitting device is a light emitting diode, a cathode of the light emitting diode is connected with the output end of the constant current driving circuit, and an anode of the light emitting diode is connected with the second end of the control switch.
The utility model has the advantages that:
the utility model discloses a link to each other voltage stabilizing circuit's input is direct with constant current drive's output to make control switch be in after last electricity and last on-state, avoid IDThe situation that lamps flicker in succession due to large voltage occurs, and the service life of the lamps is prolonged.
Drawings
FIG. 1 is a circuit diagram of a light positioning module in the related art;
fig. 2 is a schematic block diagram of a visible light indoor positioning device according to an embodiment of the present invention;
fig. 3 is a voltage waveform diagram of a light emitting device in the related art;
fig. 4 is a voltage waveform diagram of a light emitting device according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a visible light indoor positioning device according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a visible light indoor positioning device according to another embodiment of the present invention;
fig. 7 is a circuit diagram of a visible light indoor positioning device according to still another embodiment of the present invention;
fig. 8 is a voltage waveform diagram of a light emitting device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 2 is a block diagram of a visible light indoor positioning device according to an embodiment of the present invention.
As shown in fig. 2, the indoor visible light positioning device of the present invention may include: power supply 10, constant current drive circuit 20, current-limiting circuit 30, DC/DC converting circuit 40, control chip 50, voltage stabilizing circuit 60 and light orientation module 70, light orientation module 70 can include: a signal processing circuit 71, a control switch 72, and a light emitting device 73.
Wherein, the output terminal of the power supply 10 is connected to the input terminal of the constant current driving circuit 20. The output end of the constant current driver 20 is connected to one end of the current limiting circuit 30 and one end of the light emitting device 73, respectively, the other end of the light emitting device 73 is connected to the second end of the control switch 72, and the first end of the control switch 72 is grounded. The other end of the current limiting circuit 30 is connected to a voltage input terminal of the DC/DC conversion circuit 40. The voltage output end of the DC/DC conversion circuit 40 is connected to the input pin of the control chip 50 and the input end of the signal processing circuit 71, respectively. A signal output pin of the control chip 50 is connected to an input terminal of the signal processing circuit 71. An output terminal of the signal processing circuit 71 is connected to an output terminal of the voltage stabilizing circuit 60. The input end of the voltage stabilizing circuit 60 is connected to the output end of the constant current driving circuit 20, and the output end of the voltage stabilizing circuit 60 is further connected to the control end of the control switch 72, so that the control switch 72 is in a continuous conducting state after being powered on.
Specifically, as shown in fig. 1, at a moment of powering on, after an alternating current is converted into a direct current by a constant current source, the direct current directly flows through a lamp cathode to a lamp anode, since Q1 is in a cut-off state when power is off, VGS is 0V, VDS is greater than 0 after power is on, and ID is 0 at this time, a voltage of a negative terminal of the LDE lamp is increased sharply, the LED lamp is turned off after the LED lamp is turned on when the LED lamp is turned on, and the LED is turned on again after a subsequent component of a control chip is waited to operate. Such a phenomenon may cause a discontinuous working state of the module, and may cause damage to components and lamps even if the module is operated for a long time.
As shown in fig. 3, a voltage sharply increases within 0.5s after the power-on, and the voltage value is larger than the output voltage range of the power supply. In order to solve the problem, the present application directly supplies power to the control switch 72 after the ac power obtained from the power supply, the household power supply or the storage battery is converted into the DC power by the constant current driving circuit 20, so that the control switch can be ensured to be continuously turned on, and thus the situation that the negative electrode of the light emitting device is at a high voltage, and the input voltage of the positive electrode needs to pass through the control circuit that the DC/DC conversion circuit 40, the control chip 50 and the signal processing circuit 71 are avoided, so as to control the control switch 72 (i.e., Q1) to be turned on can be avoided, and the improved waveform is shown in fig. 4, where, as can be seen from fig. 4, the large voltage appearing at the input end disappears.
According to an embodiment of the present invention, as shown in fig. 5, the current limiting circuit 30 may include: the constant current driving circuit comprises a first resistor R1 and a second resistor R2 which are connected in parallel, wherein one end of the first resistor R1 and one end of the second resistor R2 which are connected in parallel are connected with an output end VINPUT of the constant current driving circuit 20, the other end of the first resistor R1 and the other end of the second resistor R2 which are connected in parallel are connected with an input end VIN of the DC/DC conversion circuit, and the resistance values of the first resistor R1 and the second resistor R2 are both 2K.
Specifically, in the related art, the current limiting resistance of the input end of the optical positioning module is too small, that is, the resistance values (10 Ω) of R1 and R2 are too small, and after the power is turned on, the current is too large, and the constant current driving circuit enters a protection state, so that a continuous and stable voltage cannot be provided for a subsequent circuit. This application increases through the resistance with current-limiting resistor R1 and R2, is changed into 2K's resistance by original 10 omega, and the electric current of module input will diminish like this, and constant current drive circuit normally works, continuously provides stable voltage for follow-up light orientation module.
It is understood that the current limiting circuit may be a parallel resistor or a single resistor, and in another embodiment of the present invention, the current limiting circuit may include: and one end of the third resistor is connected with the first output end of the constant current driving circuit, the other end of the third resistor is connected with the input end of the DC/DC conversion circuit, and the resistance value of the third resistor is 1K.
According to an embodiment of the present invention, as shown in fig. 5, the DC/DC conversion circuit 40 may include: the voltage input end of the DC/DC conversion chip U1 is connected with the other ends of the first resistor R1 and the second resistor R2 which are connected in parallel, or the voltage input end of the DC/DC conversion chip U1 is connected with the other end of the third resistor R3; the output terminal of the DC/DC conversion chip U1 is connected to the input pin of the control chip 50. The model of the DC/DC conversion chip U1 may be LPD3201, and the model of the control chip 50 may be STC15F 104W.
In an embodiment of the present invention, as shown in fig. 6, the signal processing circuit 70 may include: a control end of the first triode Q3 is connected with an output end of the DC/DC conversion chip U1, and a first end of the first triode Q3 is grounded; a control end of the second triode Q2 is connected with a signal output pin VLC Tx of the control chip 50, a first end of the second triode Q2 is connected with a second end of the first triode Q3, and a second end of the second triode Q2 is connected with an output end of the voltage stabilizing circuit 60; and one end of a fourth resistor R4, one end of the fourth resistor R4 is connected with the power supply output pin VCC of the control chip 50, and the other end of the fourth resistor R4 is connected with the output end of the DC/DC conversion chip U1.
According to an embodiment of the present invention, as shown in fig. 6, the voltage stabilizing circuit 60 may include: one end of a fifth resistor R5, one end of a fifth resistor R5 is connected with the output end of the constant current driving circuit 20, and the other end of the fifth resistor R5 is connected with the second end of the second triode Q2; and one end of a sixth resistor R6, one end of the sixth resistor R6 is connected with the other end of the fifth resistor R5, the other end of the sixth resistor R6 is grounded, a first node J1 is formed between the fifth resistor R5 and the sixth resistor R6, and the first node J1 is connected with the control end of the control switch 72. The control switch 72 is a MOS transistor, denoted as Q1, and the first node J1 is connected to the control terminal of Q1.
In an embodiment of the present invention, the light emitting device 73 may be a light emitting diode, a cathode of the light emitting diode is connected to the output terminal of the constant current driving circuit 20, and an anode of the light emitting diode is connected to the second terminal of the control switch 72.
In order to ensure the integrity of the control waveform outputted by the control chip, in an embodiment of the present invention, as shown in fig. 7, the visible light indoor positioning device may further include: and a delay circuit 80, wherein one end of the delay circuit 80 is connected with the power output end of the control chip 50, and the other end of the delay circuit 80 is connected with one end of the signal processing circuit 71.
Further in an embodiment of the present invention, the delay circuit includes: one end of a seventh resistor R7, one end of a seventh resistor R7 is connected with the output end of the DC/DC conversion chip U1, and the other end of the seventh resistor R7 is connected with the control end of the first triode Q3; one end of the first capacitor C1 is connected with the other end of the seventh resistor, and the other end of the first capacitor C1 is grounded; one end of the eighth resistor R8 is connected with the other end of the seventh resistor R7, and the other end of the eighth resistor R8 is grounded; and one end of the ninth resistor R9, one end of the ninth resistor R9 and the other end of the seventh resistor R7 are connected, and the other end of the ninth resistor R9 is grounded.
Specifically, current is obtained from a power supply, a household power supply or a storage battery, and alternating current is converted into direct current through a constant current driving circuit; the input voltage obtained by the DC/DC conversion circuit from the constant current driving circuit is 3V-100V, and the output voltage of the DC/DC conversion circuit is 5V or 3.3V. Control chip's power end pin input 5V or 3.3V, and light positioning circuit is exported to one end, and wherein, light positioning circuit includes: light signal processing circuit, control switch, luminescent device. The current output by the DC/DC conversion chip U1 is converted into a PMW-type (pulse width modulation-type) optical positioning signal by the control chip 50, and then output to the signal processing circuit 71, and is amplified by a MOS transistor or a triode in the signal processing circuit 71 and then output to the control switch 72, and when the control switch 72 is closed, the light emitting device emits the optical positioning signal in a light emitting manner.
The time for inputting the PWM wave of the single chip microcomputer to the LED is prolonged by arranging the delay circuit between the control chip and the signal processing circuit, and the integrity of the waveform is ensured. Specifically, the first third transistor Q3 is normally operated after a delay of 2-3s, and the Q2 is normally operated after Q3 to transmit a PWM waveform to the Q1, so that the light emitting device emits light and dark stripes invisible to human eyes. As can be seen from fig. 4, the circuit operates normally after 3s, and outputs a PWM waveform. The delay waveform after adding the delay circuit is shown in fig. 8.
The utility model discloses an in an embodiment, can reform transform fluorescent lamp/panel light/other LED lamps and lanterns to the fluorescent lamp for example, with access current-limiting circuit 30, DC/DC converting circuit 40, control chip 50, voltage stabilizing circuit 60 and light orientation module 70 between the drive power supply of fluorescent lamp and the lamps and lanterns, light orientation module 70 can include: the signal processing circuit 71 and the control switch 72 enable the light emitting device of the lamp to emit a light signal containing a target address code, the address code of the visible light positioning device is received and analyzed through a light receiving device (a camera device) such as an intelligent terminal, the position information of the visible light positioning device can be determined according to the address code of the visible light positioning device, and accurate positioning at a centimeter level is achieved.
After the intelligent terminal device acquires the positioning information, the positioning information can be sent to the background server through the wireless network, and the position information of the intelligent terminal device is matched with the map information according to the indoor map information, so that the positioning monitoring of the background server is realized.
In conclusion, the scheme of the utility model utilizes the visible light positioning signal emitted by the visible light positioning device, and can realize indoor visible light positioning at the same time. For example, high-precision positioning by means of optical positioning is utilized in a supermarket, accurate advertisement pushing is carried out, the sales volume of commodities is increased, the equipment is installed on a shopping basket of the supermarket, positioning and navigation functions are achieved through optical positioning of a lamp, people can be guided to a desired designated position quickly, time is saved, and management is facilitated.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A visible light indoor positioning device, comprising: power supply, constant current drive circuit, current-limiting circuit, DC/DC converting circuit, control chip, voltage stabilizing circuit and light orientation module, light orientation module includes: a signal processing circuit, a control switch and a light emitting device, wherein,
the output end of the power supply is connected with the input end of the constant current driving circuit;
the output end of the constant current drive is respectively connected with one end of the current limiting circuit and one end of the light-emitting device, the other end of the light-emitting device is connected with the second end of the control switch, and the first end of the control switch is grounded;
the other end of the current limiting circuit is connected with a voltage input end of the DC/DC conversion circuit;
the voltage output end of the DC/DC conversion circuit is respectively connected with the input pin of the control chip and the input end of the signal processing circuit;
a signal output pin of the control chip is connected with the input end of the signal processing circuit;
the output end of the signal processing circuit is connected with the output end of the voltage stabilizing circuit;
the input end of the voltage stabilizing circuit is connected with the output end of the constant current driving circuit, and the output end of the voltage stabilizing circuit is also connected with the control end of the control switch, so that the control switch is in a continuous conducting state after being electrified.
2. The visible light indoor positioning device according to claim 1, wherein the current limiting circuit includes: a first resistor and a second resistor connected in parallel, wherein,
one end of the first resistor and one end of the second resistor which are connected in parallel are connected with the output end of the constant current driving circuit, the other end of the first resistor and the other end of the second resistor which are connected in parallel are connected with the input end of the DC/DC conversion circuit, and the resistance values of the first resistor and the second resistor are both 2K.
3. The visible light indoor positioning device according to claim 2, wherein the current limiting circuit includes: a third resistor, wherein,
one end of the third resistor is connected with the first output end of the constant current driving circuit, the other end of the third resistor is connected with the input end of the DC/DC conversion circuit, and the resistance value of the third resistor is 1K.
4. The visible light indoor positioning device according to claim 3, wherein the DC/DC conversion circuit includes:
the voltage input end of the DC/DC conversion chip is connected with the other ends of the first resistor and the second resistor which are connected in parallel, or the voltage input end of the DC/DC conversion chip is connected with the other end of the third resistor;
and the output end of the DC/DC conversion chip is connected with the input pin of the control chip.
5. The visible light indoor positioning device of claim 4, wherein the model of the DC/DC conversion chip is LPD3201, and the model of the control chip is STC15F 104W.
6. The visible light indoor positioning device according to claim 4, wherein the signal processing circuit includes:
the control end of the first triode is connected with the output end of the DC/DC conversion chip, and the first end of the first triode is grounded;
the control end of the second triode is connected with the signal output pin of the control chip, the first end of the second triode is connected with the second end of the first triode, and the second end of the second triode is connected with the output end of the voltage stabilizing circuit;
and one end of the fourth resistor is connected with a power output pin of the control chip, and the other end of the fourth resistor is connected with the output end of the DC/DC conversion chip.
7. The visible light indoor positioning apparatus of claim 6, wherein the voltage stabilizing circuit comprises:
one end of the fifth resistor is connected with the output end of the constant current driving circuit, and the other end of the fifth resistor is connected with the second end of the second triode;
and one end of the sixth resistor is connected with the other end of the fifth resistor, the other end of the sixth resistor is grounded, a first node is arranged between the fifth resistor and the sixth resistor, and the first node is connected with the control end of the control switch.
8. The visible light indoor positioning apparatus according to claim 7, wherein the control switch is a MOS transistor.
9. The visible light indoor positioning device according to claim 1, wherein the light emitting device is a light emitting diode, a cathode of the light emitting diode is connected to the output terminal of the constant current driving circuit, and an anode of the light emitting diode is connected to the second terminal of the control switch.
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| CN202021525800.2U CN213073186U (en) | 2020-07-29 | 2020-07-29 | Visible light indoor positioning device |
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| CN202021525800.2U CN213073186U (en) | 2020-07-29 | 2020-07-29 | Visible light indoor positioning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114126139A (en) * | 2021-11-30 | 2022-03-01 | 华南理工大学 | LED drive module with visible light communication function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114126139A (en) * | 2021-11-30 | 2022-03-01 | 华南理工大学 | LED drive module with visible light communication function |
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