CN108307566B - LED optical communication power supply driving system - Google Patents
LED optical communication power supply driving system Download PDFInfo
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- CN108307566B CN108307566B CN201810241489.XA CN201810241489A CN108307566B CN 108307566 B CN108307566 B CN 108307566B CN 201810241489 A CN201810241489 A CN 201810241489A CN 108307566 B CN108307566 B CN 108307566B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
The application provides an LED optical communication power supply driving system, which comprises a power supply conversion circuit (1), a first LED driving circuit (2), a second LED driving circuit (4) and an optical communication current controller (3), wherein the optical communication current controller (3) further comprises: the device comprises a current modulation circuit (301), a voltage sampling circuit (302), a current sampling circuit (303), a control circuit (304), an output setting circuit (305), a first auxiliary power supply circuit (306), a second auxiliary power supply circuit (307) and an optical communication modulation signal circuit (308), wherein the current modulation circuit (301) controls the interval and the frequency of outputting a first driving voltage LED1 and a second driving voltage LED2 to a load according to an optical communication modulation signal M received from the optical communication modulation signal circuit (308), and controls the modulation of an optical communication power supply. The application has the characteristics of low cost and good performance.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an LED optical communication power supply driving system.
Background
In recent years, LED lighting based on light emitting diodes has been widely used. Compared with the traditional illumination, the LED illumination has high controllability, for example, the LED light source or the lamp can be dimmed through PWM modulation signals. Similar to PWM dimming, optical communication is performed by modulating the brightness of an LED, and can be applied to communication situations where radio waves are inconvenient to use.
The modulation frequency of the light communication to the LED is usually more than 20KHz, and according to the analysis result of the control theory, the switching frequency of the LED switching power supply can ensure the control stability of the LED switching power supply only by more than 10 times of the modulation frequency, which means that the switching frequency of the LED switching power supply is more than 200KHz, the high frequency can increase the line and switching loss, the requirements on the power device and the control loop are high, the cost is high, and the reliability is low.
Disclosure of Invention
The application aims to solve the technical problem that the application provides an LED optical communication power supply driving system, which can adopt the conventional LED switching power supply technology to ensure that the switching frequency of an LED power supply is within 100KHz, and the communication modulation frequency can be more than 20 KHz.
To solve the above technical problem, an aspect of an embodiment of the present application provides an LED optical communication power supply driving system, which includes a power conversion circuit, a first LED driving circuit, a second LED driving circuit, and an optical communication current controller, wherein:
the power supply conversion circuit is used for receiving input voltage and converting the input voltage into rated direct current voltage V+ and V-, and is an AC-DC or DC-DC circuit;
the first LED driving circuit is connected with the power supply conversion circuit and outputs a first auxiliary power supply VCC1 and a first driving voltage LED1;
the second LED driving circuit is connected with the power supply conversion circuit and outputs a second auxiliary power supply VCC2 and a second driving voltage LED2;
the optical communication current controller further includes: a current modulation circuit, a voltage sampling circuit, a current sampling circuit, a control circuit, an output setting circuit, a first auxiliary power circuit, a second auxiliary power circuit and an optical communication modulation signal circuit, wherein,
the first auxiliary power supply circuit receives a first auxiliary power supply VCC1 output by the first LED driving circuit and supplies power to the control circuit and the output setting circuit;
the second auxiliary power supply circuit receives a second auxiliary power supply VCC2 output by the second LED driving circuit and supplies power to the optical communication modulation signal circuit;
the voltage sampling circuit is arranged between two output ends of the current modulation circuit, the current sampling circuit is arranged on one of the output ends of the current modulation circuit, and the voltage sampling circuit and the current sampling circuit are both connected with the control circuit;
the control circuit receives the control of the output setting circuit and outputs a first control signal VC1 to the first LED driving circuit so as to control the magnitude of a first driving voltage LED1 output by the first LED driving circuit; and outputting a second control signal VC2 to the second LED driving circuit to control the magnitude of a second driving voltage LED2 output by the second LED driving circuit;
the current modulation circuit controls the interval and frequency of outputting the first driving voltage LED1 and the second driving voltage LED2 to the load according to the optical communication modulation signal M received from the optical communication modulation signal circuit, and controls the modulation of the optical communication power supply.
Preferably, the power conversion circuit is an AC-DC or DC-DC circuit, which is a bridge rectifier circuit or a power factor correction circuit.
Preferably, the first auxiliary power supply circuit is connected with the first LED driving circuit and receives a first auxiliary power supply VCC1 thereof; or is connected with the power supply conversion circuit to receive the rated direct current voltage V+ and V-;
the second auxiliary power supply circuit is connected with the second LED driving circuit and receives a second auxiliary power supply VCC2 thereof; or is connected with the power supply conversion circuit to receive the rated direct current voltage V+ and V-.
Preferably, the first LED driving circuit and the second LED driving circuit are one of a flyback circuit, a boost circuit, a buck circuit, a boost-buck circuit, and an LLC conversion circuit, and the outputs of the first LED driving circuit and the second LED driving circuit are constant voltage sources or constant current sources.
Preferably, the first control signal VC1 and the second control signal VC2 output by the control circuit are PWM signals with variable duty ratios or variable direct current voltage signals.
Preferably, the output setting circuit is one of a resistor voltage division network, a dial circuit, a wired programmable input circuit, a near-field wireless transmission circuit and a radio frequency wireless transmission circuit.
Preferably, the current modulation circuit includes:
the first end of the change-over switch is connected with the first LED driving circuit and receives a first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit and receives an optical communication modulation signal M;
the negative electrode of the diode is connected with the second end of the change-over switch and LED out of the first output end LED+ of the current modulation circuit; the anode of the first LED driving circuit is connected with the second LED driving circuit and receives a second driving voltage LED2;
and one end of the current sampling resistor is grounded, and the other end of the current sampling resistor is LED out of a second output end LED-of the current modulation circuit.
Preferably, the change-over switch adopts one of a MOS tube, a triode, a silicon controlled rectifier and a relay.
Preferably, the current modulation circuit includes:
the first end of the second change-over switch is connected with the first LED driving circuit and receives a first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit and receives an optical communication modulation signal M;
the third change-over switch is connected with the second end of the change-over switch in a second mode and leads out a first output end LED+ of the current modulation circuit; the first end of the first switch is connected with the second LED driving circuit, receives a second driving voltage LED2, the control end of the first switch is connected with the optical communication modulation signal circuit, receives an optical communication modulation signal M, and the second switch and the third switch are a pair of complementary switches;
and one end of the current sampling resistor is grounded, and the other end of the current sampling resistor is LED out of a second output end LED-of the current modulation circuit.
Preferably, the current modulation circuit includes:
the anode of the first diode is connected with the first LED driving circuit and receives a first driving voltage LED1; the negative electrode of the LED+ is LED out of a first output end LED+ of the current modulation circuit;
a second diode, the cathode of which is connected with the cathode of the first diode; the anode of the first LED driving circuit is connected with the anode of the second LED driving circuit and receives a second driving voltage LED2;
the first end of the fourth change-over switch is grounded, the second end of the fourth change-over switch is connected with the second LED driving circuit, and the negative electrode of the second driving voltage LED2 is received; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit and receives an optical communication modulation signal M;
and one end of the current sampling resistor is connected with the second end of the fourth change-over switch, and the other end of the current sampling resistor is LED out of the second output end LED-of the current modulation circuit.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides an LED optical communication power supply driving system, wherein a current modulation circuit is independent of a first LED driving circuit and a second LED driving circuit, so that the working states of the first LED driving circuit and the second LED driving circuit are not influenced when an optical communication modulation signal M is added to the current modulation circuit, the power supply switching frequency of an LED optical communication power supply can be controlled within 100KHz, the optical communication modulation frequency can reach more than 20KHz, the switching power supply adopts a conventional LED driving power supply technology, the cost of the power supply is reduced, and the reliability is low.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of an LED optical communication power driving system according to the present application;
FIG. 2 is a schematic diagram of one embodiment of the current modulation circuit of FIG. 1;
FIG. 3 is a waveform diagram of the modulated LED current of FIG. 1;
FIG. 4 is a schematic diagram of one embodiment of the power conversion circuit of FIG. 1;
FIG. 5 is a schematic diagram of one embodiment of the first LED driver circuit of FIG. 1;
FIG. 6 is a schematic diagram of one embodiment of the second LED driver circuit of FIG. 1;
FIG. 7 is a schematic diagram of one embodiment of the current modulation circuit of FIG. 1, which is a refinement of FIG. 2;
FIG. 8 is a schematic diagram of one embodiment of the first auxiliary power circuit, current sampling circuit, voltage sampling circuit, control circuit, and output setting circuit of FIG. 1;
FIG. 9 is a schematic diagram of one embodiment of the second auxiliary power circuit of FIG. 1;
FIG. 10 is a schematic diagram of one embodiment of the optical communication modulation signal circuit of FIG. 1;
FIG. 11 is a schematic diagram of another embodiment of the current modulation circuit of FIG. 1;
fig. 12 is a schematic diagram of a further embodiment of the current modulation circuit of fig. 1.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted here that, in order to avoid obscuring the present application due to unnecessary details, only structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not greatly related to the present application are omitted.
Referring to fig. 1, a schematic structural diagram of an embodiment of an LED optical communication power driving system provided by the present application is shown. As shown in fig. 2 and 3 in combination, in this embodiment. The LED optical communication power supply driving system comprises a power supply conversion circuit 1, a first LED driving circuit 2, a second LED driving circuit 4 and an optical communication current controller 3, wherein:
the power supply conversion circuit 1 is used for receiving an input voltage and converting the input voltage into rated direct current voltage V+ and V-, and is an AC-DC or DC-DC circuit;
the first LED driving circuit 2 is connected with the power supply conversion circuit and outputs a first auxiliary power supply VCC1 and a first driving voltage LED1;
a second LED driving circuit 4 connected to the power conversion circuit and outputting a second auxiliary power VCC2 and a second driving voltage LED2;
the optical communication current controller 3 further includes: a current modulation circuit 301, a voltage sampling circuit 302, a current sampling circuit 303, a control circuit 304, an output setting circuit 305, a first auxiliary power supply circuit 306, a second auxiliary power supply circuit 307, and an optical communication modulation signal circuit 308, wherein,
a first auxiliary power supply circuit 306 which receives the first auxiliary power supply VCC1 outputted from the first LED driving circuit 2 and supplies power to the control circuit 304 and the output setting circuit 305;
a second auxiliary power supply circuit 307 which receives the second auxiliary power supply VCC2 outputted from the second LED driving circuit 4 and supplies power to the optical communication modulation signal circuit 308;
the voltage sampling circuit 302 is arranged between two output ends of the current modulation circuit 301, the current sampling circuit 303 is arranged on one of the output ends of the current modulation circuit 301, and the voltage sampling circuit 302 and the current sampling circuit 303 are connected with the control circuit 304;
a control circuit 304 that receives control from the output setting circuit 305 and outputs a first control signal VC1 to the first LED driving circuit 2 to control the magnitude of the first driving voltage LED1 output from the first LED driving circuit 2; and outputs a second control signal VC2 to the second LED driving circuit 4 to control the magnitude of the second driving voltage LED2 output from the second LED driving circuit 4;
the current modulation circuit 301 controls the interval and frequency of outputting the first drive voltage LED1 and the second drive voltage LED2 to the load, and controls the modulation of the optical communication power supply, based on the optical communication modulation signal M received from the optical communication modulation signal circuit 308.
The power conversion circuit 1 is an AC-DC or DC-DC circuit, which is a bridge rectifier circuit or a power factor correction circuit.
Wherein, the first auxiliary power circuit 306 is connected with the first LED driving circuit 2 and receives the first auxiliary power VCC1 thereof; or is connected with the power supply conversion circuit 1 to receive the rated direct current voltage V+ and V-;
the second auxiliary power supply circuit 307 is connected to the second LED driving circuit 4 and receives the second auxiliary power supply VCC2 thereof; or is connected with the power conversion circuit 1 to receive the rated direct current voltage V+ and V-.
The first LED driving circuit 2 and the second LED driving circuit 4 are one of a flyback circuit, a boost circuit, a buck circuit, a boost-buck circuit, and an LLC conversion circuit, and the outputs of the first LED driving circuit 2 and the second LED driving circuit 4 are constant voltage sources or constant current sources.
The first control signal VC1 and the second control signal VC2 output by the control circuit 304 are PWM signals with variable duty ratios or variable dc voltage signals.
The output setting circuit 305 is one of a resistor voltage divider network, a dial circuit, a wired programmable input circuit, a near-field wireless transmission circuit, and a radio frequency wireless transmission circuit.
Wherein the current modulation circuit 301 comprises:
a first end of the change-over switch 3011 is connected to the first LED driving circuit 2 and receives the first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit 308 and receives an optical communication modulation signal M;
a diode 3012, whose negative electrode is connected to the second end of the switch 3011 and leads out the first output terminal led+ of the current modulation circuit 301; the anode of the first LED driving circuit is connected with the second LED driving circuit 4 and receives a second driving voltage LED2;
a current sampling resistor 3013, one end of which is grounded and the other end of which leads out of the second output terminal LED-of the current modulation circuit 301.
Wherein, the change-over switch 3011 adopts one of MOS pipe, triode, silicon controlled rectifier, relay.
Specifically, the control circuit 304 outputs the first control signal VC1 to control the output current Ip of the first LED driving circuit 2, and the control circuit 304 outputs the second control signal VC2 to control the output currents Iv, ip of the second LED driving circuit 4 to be always larger than Iv. The optical communication modulation signal circuit 308 outputs M to the changeover switch 3011 to control the output LED1 of the first LED driving circuit 2 to turn on or off the LED load, and when the changeover switch 3011 is turned on, the first LED driving circuit 2 outputs a current Ip, and since Ip is always larger than Iv, the potential of the LED1 is higher than that of the LED2, the diode 3012 is turned off, the output LED1 of the first LED driving circuit 2 supplies power to the LED load through the changeover switch 3011, and the current value is Ip. When the changeover switch 3011 is turned off, the output LED2 of the second LED driving circuit 4 supplies power to the LED load through the diode 3012, and the current value is Iv. The modulated output current waveform is similar to that shown in fig. 3.
Since the current modulation circuit 301 is independent of the first LED driving circuit 2 and the second LED driving circuit 4, the application of the optical communication modulation signal M to the current modulation circuit 301 does not affect the operation states of the first LED driving circuit 2 and the second LED driving circuit 4, so that the conventional LED switching power supply technology within 100KHZ can be adopted.
In order to make the principles and operation of the present application more apparent, the present application will be described in the following by way of a specific embodiment.
Example 1
As shown in fig. 4, a schematic diagram of the power conversion circuit 1 in fig. 1 is shown. It can be seen that in the case of an input voltage of 100-277VAC, the power conversion circuit 1 employs a power factor correction circuit designed using L6562 or a similar chip, which can convert the input ac 100-277VAC to 400VDC v+/V-.
As shown in fig. 5, a schematic diagram of the structure of one embodiment of the first LED driving circuit 2 in fig. 1 is shown. In fig. 5, the first LED driving circuit 2 employs a primary side controlled flyback circuit designed with SY5882 or similar chip to convert v+/V-of 400VDC to LED1/GND. The first LED driving circuit 2 outputs VCC1/GND to the first auxiliary power supply circuit 306, and receives the first control signal VC1 outputted from the control circuit 304 to adjust the output LED1/GND.
As shown in fig. 6, a schematic diagram of an embodiment of the second LED driving circuit 4 in fig. 1 is shown. In fig. 6, the second LED driving circuit 4 employs a primary side controlled flyback circuit designed with SY5882 or similar chip to convert v+/V-of 400VDC to LED2/GND. The second LED driving circuit 4 outputs VCC2/led+ to the second auxiliary power supply circuit 307, and receives the second control signal VC2 output from the control circuit 304 to adjust the output LED2/GND.
As shown in fig. 7, a schematic diagram of an embodiment of the current modulation circuit 301 of fig. 1 is shown, which is a further refinement of fig. 2. In fig. 7, the switch 3011 is a MOS transistor 301-Q1, the diode 3012 is a schottky diode 301-D1, and the current sampling resistor 3013 is a high-power plug-in resistor 301-R2. The control circuit 304 outputs the first control signal VC1 to control the output current Ip of the first LED driving circuit 2, and the control circuit 304 outputs the second control signal VC2 to control the output current Iv of the second LED driving circuit 4, with Ip being designed to be always larger than Iv. The optical communication modulation signal circuit 308 outputs M to the MOS tube 301-Q1 to control the output LED1 of the first LED driving circuit 2 to switch on or switch off the LED load, when the MOS tube 301-Q1 is conducted, the first LED driving circuit 2 outputs current Ip, the potential of the LED1 is higher than that of the LED2 because Ip is always larger than Iv, the Schottky diode 301-D1 is cut off, the output LED1 of the first LED driving circuit 2 supplies power to the load LED+/LED through the MOS tube 301-Q1, and the current value is Ip. When the MOS transistor 301-Q1 is turned off, the output LED2 of the second LED driving circuit 4 supplies power to the load LED+/LED through the 301-D1 Schottky diode, and the current value is Iv. The modulated output current waveform is similar to that shown in fig. 3.
As shown in fig. 8, a schematic diagram of an embodiment of the first auxiliary power supply circuit 306, the current sampling circuit 303, the voltage sampling circuit 302, the control circuit 304, and the output setting circuit 306 in fig. 1 is shown. In fig. 8, the first auxiliary power supply circuit 306 is composed of a three-terminal voltage stabilizing chip 306-U1, and converts VCC1 into VCC to supply power to the current sampling circuit 303, the control circuit 304, and the output setting circuit 306.
The voltage sampling circuit 302 adopts a voltage division network formed by the resistors 302-R1 and 302-R2 to sample the voltage of the output voltage LED+ to GND, and the voltage is used for controlling the ADC0 port of the singlechip 304-U1. The voltage drop of the current sampling resistor 301-R2 is amplified by the operational amplifier 303-U1A in the current sampling circuit 303 and then is supplied to the ADC1 port of the singlechip 304-U1 for control.
The singlechip 304-U1 of the control circuit 304 performs control operation according to the output voltage and current signals, and outputs PWM signals VC1 and VC2 with variable duty ratio to respectively control the output current Ip of the first LED driving circuit 2 and the output current Iv of the second LED driving circuit 4. The output setting circuit 306 is composed of a resistor 305-R1 and a variable resistor 305-R2, and sets whether the output is a constant voltage or a constant current mode by changing the variable resistor 305-R2 to give a variable voltage LOAD to the single chip microcomputer 304-U1, and the voltage value of the constant voltage or the current value of the constant current, for example, load=0.5v is a 12V constant voltage output, load=1v is a 24V constant voltage output, load=2.3v is a 1.3a constant current output.
As shown in fig. 9, a schematic diagram of an embodiment of the second auxiliary power supply circuit 307 in fig. 1 is shown. In fig. 8, the second auxiliary power supply circuit 307 is composed of a three-terminal regulator chip 307-U1, which converts VCC2 into 5V VDD to supply power to the optical communication modulation signal circuit 308.
As shown in fig. 10, a schematic diagram of an embodiment of the optical communication modulation signal circuit 308 of fig. 1 is shown. In fig. 9, the power grounds of the second auxiliary power supply circuit 307 and the optical communication modulation signal circuit 308 are led+, so that the MOS transistors 301-Q1 in the current modulation circuit 301 of fig. 7 can be driven. The singlechip 308-U1 in the optical communication modulation signal circuit 308 generates an optical communication modulation signal to amplify the MOS transistor driving chip 308-U2 and outputs a driving signal M to drive the MOS transistor 301-Q1 in the current modulation circuit 301 in FIG. 7.
As shown in fig. 11, a schematic diagram of another embodiment of the current modulation circuit 301 of fig. 1 is shown. In this embodiment, the modulation circuit 301 includes:
a second switch 3014, a first end of which is connected to the first LED driving circuit 2 and receives the first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit 308 and receives an optical communication modulation signal M;
a third switch 3015, whose second end is connected to the second end of the switch 3014 and leads out the first output end led+ of the current modulation circuit 301; a first end of the LED driving circuit is connected with the second LED driving circuit 4 and receives a second driving voltage LED2, and a control end of the LED driving circuit is connected with the optical communication modulation signal circuit 308 and receives an optical communication modulation signal M; the second switch 3014 and the third switch 3015 are a pair of complementary switches, for example, when M is high, the second switch is turned on and the third switch is turned off, and when M is low, the second switch is turned off and the third switch is turned on;
a current sampling resistor 3013, one end of which is grounded and the other end of which leads out of the second output terminal LED-of the current modulation circuit 301.
As shown in fig. 12, a schematic diagram of a further embodiment of the current modulation circuit 301 of fig. 1 is shown. In this embodiment, the modulation circuit 301 includes:
a first diode 3016 having an anode connected to the first LED driving circuit 2 and receiving the first driving voltage LED1; the negative pole of which leads out of the first output terminal led+ of the current modulation circuit 301;
a second diode 3017, the cathode of which is connected to the cathode of the first diode 3016; the anode of the first LED driving circuit is connected with the anode of the second LED driving circuit 4 and receives the anode of the second driving voltage LED2;
a fourth switch 3018, the first end of which is grounded, the second end of which is connected to the second LED driving circuit 4 and receives the negative electrode of the second driving voltage LED2; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit 308 and receives an optical communication modulation signal M;
and one end of the current sampling resistor 3013 is connected with the second end of the fourth change-over switch 3018, and the other end of the current sampling resistor is LED out of the second output end LED-of the current modulation circuit 301.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides an LED optical communication power supply driving system, wherein a current modulation circuit is independent of a first LED driving circuit and a second LED driving circuit, so that the working states of the first LED driving circuit and the second LED driving circuit are not influenced when an optical communication modulation signal M is added to the current modulation circuit, the power supply switching frequency of an LED optical communication power supply can be controlled within 100KHz, the optical communication modulation frequency can reach more than 20KHz, the switching power supply adopts a conventional LED driving power supply technology, the cost of the power supply is reduced, and the reliability is low.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.
Claims (10)
1. An LED optical communication power supply driving system, comprising a power supply conversion circuit (1), a first LED driving circuit (2), a second LED driving circuit (4) and an optical communication current controller (3), wherein:
the power supply conversion circuit (1) is used for receiving input voltage and converting the input voltage into rated direct current voltage V+ and V-, and is an AC-DC or DC-DC circuit;
a first LED driving circuit (2) connected to the power conversion circuit and outputting a first auxiliary power supply VCC1 and a first driving voltage LED1;
a second LED driving circuit (4) connected with the power conversion circuit and outputting a second auxiliary power supply VCC2 and a second driving voltage LED2;
the optical communication current controller (3) further includes: a current modulation circuit (301), a voltage sampling circuit (302), a current sampling circuit (303), a control circuit (304), an output setting circuit (305), a first auxiliary power supply circuit (306), a second auxiliary power supply circuit (307), and an optical communication modulation signal circuit (308), wherein,
a first auxiliary power supply circuit (306) which receives a first auxiliary power supply VCC1 outputted from the first LED driving circuit (2) and supplies power to the control circuit (304) and the output setting circuit (305);
a second auxiliary power supply circuit (307) which receives a second auxiliary power supply VCC2 output from the second LED drive circuit (4) and supplies power to the optical communication modulation signal circuit (308);
the voltage sampling circuit (302) is arranged between two output ends of the current modulation circuit (301), the current sampling circuit (303) is arranged on one of the output ends of the current modulation circuit (301), and the voltage sampling circuit (302) and the current sampling circuit (303) are connected with the control circuit (304);
a control circuit (304) which receives control of the output setting circuit (305) and outputs a first control signal VC1 to the first LED driving circuit (2) so as to control the magnitude of a first driving voltage LED1 output by the first LED driving circuit (2); and outputs a second control signal VC2 to the second LED driving circuit (4) to control the magnitude of the second driving voltage LED2 output by the second LED driving circuit (4);
the current modulation circuit (301) controls the interval and frequency of outputting the first drive voltage LED1 and the second drive voltage LED2 to the load according to the optical communication modulation signal M received from the optical communication modulation signal circuit (308), and controls the modulation of the optical communication power supply.
2. The LED optical communication power supply driving system according to claim 1, wherein the power supply conversion circuit (1) is an AC-DC or DC-DC circuit, which is a bridge rectifier circuit or a power factor correction circuit.
3. The LED optical communication power supply driving system according to claim 2, wherein the first auxiliary power supply circuit (306) is connected to the first LED driving circuit (2) and receives the first auxiliary power supply VCC1 thereof; or is connected with the power supply conversion circuit (1) to receive the rated direct current voltage V+ and V-;
the second auxiliary power supply circuit (307) is connected with the second LED driving circuit (4) and receives a second auxiliary power supply VCC2 thereof; or is connected with the power supply conversion circuit (1) to receive the rated direct current voltage V+ and V-.
4. A LED optical communication power supply driving system according to claim 3, wherein the first LED driving circuit (2) and the second LED driving circuit (4) are one of a flyback circuit, a step-up circuit, a step-down circuit, a step-up-down circuit, and an LLC conversion circuit, and the outputs of the first LED driving circuit (2) and the second LED driving circuit (4) are constant voltage sources or constant current sources.
5. The LED optical communication power driving system according to claim 4, wherein the first control signal VC1 and the second control signal VC2 outputted from the control circuit (304) are both a PWM signal with a variable duty cycle or a variable dc voltage signal.
6. The LED optical communication power supply driving system according to claim 5, wherein said output setting circuit (305) is one of a resistor divider network, a dial-up circuit, a wired programmable input circuit, a near-field wireless transmission circuit, and a radio frequency wireless transmission circuit.
7. The LED optical communication power supply driving system according to any one of claims 1 to 6, wherein the current modulation circuit (301) includes:
a change-over switch (3011), the first end of which is connected with the first LED driving circuit (2) and receives the first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit (308) and receives an optical communication modulation signal M;
a diode (3012) whose negative electrode is connected to the second end of the switch (3011) and which leads out the first output led+; the anode of the LED driving circuit is connected with the second LED driving circuit (4) and receives a second driving voltage LED2;
and a current sampling resistor (3013), one end of which is grounded, and the other end of which is LED out of the second output end LED-of the current modulation circuit (301).
8. The LED optical communication power supply driving system according to claim 7, wherein the change-over switch (3011) is one of a MOS transistor, a triode, a thyristor, and a relay.
9. The LED optical communication power supply driving system according to any one of claims 1 to 6, wherein the current modulation circuit (301) includes:
a second change-over switch (3014), the first end of which is connected with the first LED driving circuit (2) and receives the first driving voltage LED1; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit (308) and receives an optical communication modulation signal M;
a third switch 3015, the second end of which is connected to the second end of the second switch 3014 and which leads out the first output end led+ of the current modulation circuit 301; the first end of the LED driving circuit is connected with the second LED driving circuit (4), the second driving voltage LED2 is received, the control end of the LED driving circuit is connected with the optical communication modulation signal circuit (308), the optical communication modulation signal M is received, and the second change-over switch (3014) and the third change-over switch (3015) are a pair of complementary switches;
and a current sampling resistor (3013), one end of which is grounded, and the other end of which is LED out of the second output end LED-of the current modulation circuit (301).
10. The LED optical communication power supply driving system according to any one of claims 1 to 6, wherein the current modulation circuit (301) includes:
a first diode (3016) whose anode is connected to the first LED driving circuit (2) and which receives the first driving voltage LED1; the negative pole of which leads out of a first output end LED+ of the current modulation circuit (301);
a second diode (3017) having a cathode connected to the cathode of the first diode (3016); the anode of the first LED driving circuit is connected with the anode of the second LED driving circuit (4) and receives the anode of the second driving voltage LED2;
a fourth change-over switch (3018), the first end of which is grounded, the second end of which is connected with the second LED driving circuit (4) and receives the negative electrode of the second driving voltage LED2; the control end of the optical communication modulation signal circuit is connected with the optical communication modulation signal circuit (308) and receives an optical communication modulation signal M;
and one end of the current sampling resistor (3013) is connected with the second end of the fourth change-over switch (3018), and the other end of the current sampling resistor is LED out of the second output end LED-of the current modulation circuit (301).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810241489.XA CN108307566B (en) | 2018-03-22 | 2018-03-22 | LED optical communication power supply driving system |
| PCT/CN2018/082144 WO2019178896A1 (en) | 2018-03-22 | 2018-04-08 | Led optical communication power supply driving system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810241489.XA CN108307566B (en) | 2018-03-22 | 2018-03-22 | LED optical communication power supply driving system |
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| CN108307566A CN108307566A (en) | 2018-07-20 |
| CN108307566B true CN108307566B (en) | 2023-11-24 |
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| CN201810241489.XA Active CN108307566B (en) | 2018-03-22 | 2018-03-22 | LED optical communication power supply driving system |
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| CN (1) | CN108307566B (en) |
| WO (1) | WO2019178896A1 (en) |
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| JP2023117941A (en) * | 2022-02-14 | 2023-08-24 | 富士フイルムビジネスイノベーション株式会社 | Light source device, light emitting device, and measuring device |
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| CN103139990A (en) * | 2013-01-31 | 2013-06-05 | 广东卓耐普智能技术股份有限公司 | Light-adjustable light-emitting diode (LED) driving power |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| JP2015170530A (en) * | 2014-03-07 | 2015-09-28 | パナソニックＩｐマネジメント株式会社 | Illumination light communication device |
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| WO2019178896A1 (en) | 2019-09-26 |
| CN108307566A (en) | 2018-07-20 |
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