CN111182689A - Visible light communication modulation circuit and method based on single-stage forward LED drive circuit - Google Patents
Visible light communication modulation circuit and method based on single-stage forward LED drive circuit Download PDFInfo
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Abstract
The invention provides a visible light communication modulation circuit and a method based on a single-stage forward LED drive circuit, which comprises the following steps: the LED lamp driving circuit comprises a Boost PFC converter circuit, a single-stage double-tube forward double-output synchronous rectification circuit and an LED lamp load; the Boost PFC converter circuit and the single-stage double-tube forward double-output synchronous rectification circuit are integrated into a single-stage circuit; and the secondary side of the single-stage double-tube forward double-output synchronous rectification circuit is connected with two ends of the LED lamp load. A Boost PFC circuit and a double-tube forward circuit with double synchronous rectification on a secondary side are organically integrated into a single-stage driving circuit, an output direct current is adopted to bias and superpose a high-frequency spectrum current to modulate a communication signal, a QAM modulation mode is specifically adopted to realize the illumination and visible light communication of an LED, and the power level and the conversion efficiency of communication modulation equipment are improved.
Description
Technical Field
The invention relates to the field of LED illumination and visible light communication, in particular to a visible light communication modulation circuit and method based on a single-stage forward LED drive circuit, which are used for realizing LED illumination and visible light communication modulation.
Background
The visible light communication technology is a novel wireless communication mode which is rapidly developed in the last decade, an indoor visible light wireless communication network can be constructed by adding a data transmission additional function on a public infrastructure illumination facility and combining communication with an indoor illumination light source, and wireless transmission of information from a server to a client is realized. In this case, LEDs are a great advantage as light sources compared to incandescent and fluorescent lamps, and thus the frequency response of LEDs provides sufficient bandwidth for many applications to transmit digital data at a sufficient rate. VLC may provide expanded functionality for conventional lighting systems, not only providing higher quality artificial lighting, but also providing a wireless communication medium that does not interfere with ordinary Radio Frequency (RF) communications.
Quadrature Amplitude Modulation (QAM) is a modulation technique which has high spectrum utilization rate and can adaptively adjust the modulation rate according to the difference between the transmission environment and the transmission information source, thereby well relieving the shortage of available frequency bands and realizing multi-rate multimedia integrated service transmission. In the face of the rapid increase of users and the demand of people for high-speed and broadband multimedia communication, the communication range of the radio frequency power amplifier becomes more and more limited.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a visible light communication modulation circuit and method based on a single-stage forward LED driving circuit, which considers that the visible light wireless communication optical frequency band transmission information of the LED using the switching converter has a wide communication bandwidth, avoids electromagnetic interference collision, does not need to apply for a frequency band use license, and can meet the requirements of the next generation of multimedia communication. A Boost PFC circuit and a double-tube forward circuit with double synchronous rectification on a secondary side are organically integrated into a single-stage driving circuit, an output direct current is adopted to bias and superpose a high-frequency spectrum current to modulate a communication signal, a QAM modulation mode is specifically adopted to realize the illumination and visible light communication of an LED, and the power level and the conversion efficiency of communication modulation equipment are improved.
In order to achieve the purpose, the invention specifically adopts the following technical scheme:
a visible light communication modulation circuit based on a single-stage forward LED drive circuit is characterized by comprising: the LED lamp driving circuit comprises a Boost PFC converter circuit, a single-stage double-tube forward double-output synchronous rectification circuit and an LED lamp load; the Boost PFC converter circuit and the single-stage double-tube forward double-output synchronous rectification circuit are integrated into a single-stage circuit; and the secondary side of the single-stage double-tube forward double-output synchronous rectification circuit is connected with two ends of the LED lamp load.
Further, an alternating current power supply is connected with the Boost PFC converter circuit through a rectifying circuit.
Preferably, the Boost PFC converter circuit comprises: PFC inductance L, first power MOS switch tube S1A first power diode D1DC bus capacitor Cb(ii) a The single-stage double-tube forward double-output synchronous rectification circuit and the Boost PFC converter circuit multiplex a first power MOS switching tube S1A first power diode D1The method also comprises the following steps: high-frequency transformer T and second power MOS switch tube S2A third power MOS switch tube S3Fourth power MOS switch tube S4The fifth power MOS switch tube S5Sixth power MOS switch tube S6A second power diode D2DC bus capacitor CbOutput electrolytic capacitor C0And a DC-DC inductor LaAnd LbA double-output synchronous rectification forward DC-DC unit is formed; the rectification circuit comprises a rectifier bridge BD consisting of 4 diodes1。
Preferably, an alternating current source AC is connected to said diode rectifier bridge BD1(ii) a The diode rectifier bridge BD1The positive output end of the inductor is connected with a connected with the PFC inductor L1Terminal a of the PFC inductance L2End-connected first power MOS switch tube S1Drain electrode of (1), first power diode D1Anode of and primary winding N of high-frequency transformer TpA non-homonymous end of (c); the first power MOS switch tube S1Is connected to a second power diode D2Anode and dc bus capacitor CbA negative terminal of (a); the first power diode D1The cathode of the first power MOS switch tube is connected with a second power MOS switch tube S2Drain electrode of (2) and DC bus capacitor CbA positive terminal of; the second power MOS switch tube S2The source electrode of the high-frequency transformer T is connected with a primary winding N of the high-frequency transformer TpAnd a second power diode D2A cathode of (a); the secondary winding N of the high-frequency transformer Ts1End of same nameConnecting a third power MOS switch tube S3A drain electrode of (1); the third power MOS switch tube S3Is connected with a fifth power MOS switch tube S5And DC-DC inductor LaB of (a)1A terminal; the DC-DC inductor LaB of (a)2Connecting a DC-DC inductor LbC of2End and output electrolytic capacitor C0And a positive terminal of the LED lamp load; the secondary winding N of the high-frequency transformer Ts2The same name end of the first power MOS switch tube is connected with a fourth power MOS switch tube S4A drain electrode of (1); the fourth power MOS switch tube S4Is connected with a DC-DC inductor LbC of1Terminal and sixth power MOS switch tube S6A drain electrode of (1); the sixth power MOS switch tube S6The source electrode of the high-frequency transformer is connected with a secondary winding N of the high-frequency transformer Ts2Non-homonymous terminal of and output electrolytic capacitor C0Negative terminal of the fifth power MOS switch tube S5Source electrode of the high-frequency transformer T and a secondary winding N of the high-frequency transformer Ts1The non-homonymous terminal of (1) and the negative terminal of the LED lamp load; the DC-DC inductor LbC of2End-connected DC-DC inductor LaB of (a)2End and output electrolytic capacitor C0And the positive terminal of the LED lamp load.
Preferably, the high-frequency transformer T is a single-ended excitation high-frequency transformer, the secondary side of which is a dual-winding output and the primary side of which is an excitation winding NpEnd of same name and secondary winding Ns1、Ns2The excitation homonymous terminals of the same.
Preferably, the diode rectifier bridge BD1The adopted 4 diodes are all rectification slow power diodes; the first power diode D1A second power diode D2A third power diode D3A fourth power diode D4A fifth power diode D5Sixth power diode D6Are all fast recovery power diodes.
And a modulation method according to the above preferred circuit arrangement, characterized in that: the secondary winding N of the high-frequency transformer Ts1And Ns2Voltage V oninAre of the same amplitude and phase; by separately controlling a third power MOS switch transistor S3And the fourthPower MOS switch tube S4And a fifth power MOS switch tube S5Sixth power MOS switch tube S6The on-off time of the single-stage double-tube forward double-output synchronous rectification circuit is adjusted to output a switch node voltage vX1、vX2To control the high-frequency spectrum amplitude and phase of the output current ripple to realize the data modulation of the LED visible light communication, wherein the third power MOS switch transistor S3And a fifth power MOS switch tube S5Complementary control forms one VLC communication signal of output phase and amplitude; the fourth power MOS switch tube S4And a sixth power MOS switch tube S6Complementary control is formed, wherein the other path outputs a phase and amplitude VLC communication signal; the switching frequency and the duty ratio of each phase of switching tube are the same.
Preferably, a QAM communication modulation method is adopted, and the third power MOS switch tube S3And a fifth power MOS switch tube S5Complementary control forms one VLC communication signal of output phase and amplitude; the fourth power MOS switch tube S4And a sixth power MOS switch tube S6The complementary control forms one of the two paths of output phase and magnitude VLC communication signals.
The invention and the preferable scheme thereof have the following beneficial effects:
1. the advantages of high efficiency and high power of the single-stage forward conversion circuit are fully exerted.
2. A high-frequency spectrum amplitude and a phase of output current are regulated and controlled by a double-path synchronous rectification circuit, and a high-power and high-efficiency communication method is realized by adopting QAM modulation.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of mode 1 of forward conduction of the single-stage forward circuit and output conduction of the first winding of the secondary side of the double-transistor forward in the embodiment of the invention.
Fig. 3 is a schematic diagram of a mode 2 in which the single-stage forward circuit is in forward conduction and two windings on the secondary side of the double-transistor forward circuit are in output conduction according to the embodiment of the invention.
Fig. 4 is a schematic diagram of mode 3 of forward conduction of the single-stage forward circuit and output conduction of the secondary winding of the double-transistor forward secondary according to the embodiment of the present invention.
FIG. 5 is a schematic diagram of the operation of an embodiment of the present invention with the summation of two sinusoidal waveforms of the same amplitude and phase frequency but different phases.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
As shown in fig. 1, the present invention provides a visible light communication modulation circuit and method based on a single-stage forward LED driving circuit, wherein the design content of the circuit part includes: input AC power supply, diode rectifier bridge BD1High-frequency transformer T and first power MOS switch tube S1A second power MOS switch tube S2A third power MOS switch tube S3Fourth power MOS switch tube S4The fifth power MOS switch tube S5Sixth power MOS switch tube S6A first power diode D1A second power diode D2DC bus capacitor CbOutput electrolytic capacitor C0PFC inductor L, DC-DC inductor LaAnd LbAn LED lamp load; AC source connected diode rectifier bridge BD1(ii) a Diode rectifier bridge BD1Is connected with a of the PFC inductor L1Terminal, a of PFC inductor L2Terminal of first power MOS switch tube S1Drain electrode of (1), first power diode D1Anode of and primary winding N of high-frequency transformer TpA non-homonymous end of (c); first power MOS switch tube S1Is connected to a second power diode D2Anode and dc bus capacitor CbA negative terminal of (a); first power diode D1The cathode of the first power MOS switch tube is connected with a second power MOS switch tube S2Drain electrode of (2) and DC bus capacitor CbA positive terminal of; second power MOS switch tube S2The source electrode of the high-frequency transformer T is connected with a primary winding N of the high-frequency transformer TpAnd a second power diode D2A cathode of (a); high-frequency transformer T secondary winding Ns1The same name end of the third power MOS switch tube S3A drain electrode of (1); third power MOS switch tube S3Is connected with a fifth power MOS switch tube S5And DC-DC inductor LaB of (a)1A terminal; DC-DC inductance LaB of (a)2Connecting a DC-DC inductor LbC of2End and output electrolytic capacitor C0And a positive terminal of the LED lamp load; high-frequency transformer T secondary winding Ns2The same name end of the first power MOS switch tube is connected with a fourth power MOS switch tube S4A drain electrode of (1); fourth power MOS switch tube S4Is connected with a DC-DC inductor LbC of1Terminal and sixth power MOS switch tube S6A drain electrode of (1); sixth power MOS switch tube S6The source electrode of the high-frequency transformer is connected with a secondary winding N of the high-frequency transformer Ts2Non-homonymous terminal of and output electrolytic capacitor C0Negative terminal of the fifth power MOS switch tube S5Source electrode of the high-frequency transformer T and a secondary winding N of the high-frequency transformer Ts1The non-homonymous terminal of (1) and the negative terminal of the LED lamp load; DC-DC inductance LbC of2End-connected DC-DC inductor LaB of (a)2End and output electrolytic capacitor C0And the positive terminal of the LED lamp load. First power MOS switch tube S1And a second power MOS switch tube S2PWM or PFM is adopted to control a PFC function and a DC-DC constant current output function of a Boost circuit; third power MOS switch tube S3The fifth power MOS switch tube S5Fourth power MOS switch tube S4And a sixth power MOS switch tube S6And a forward and secondary double-output synchronous rectification conversion circuit is formed.
The following is a specific embodiment of the present invention:
the LED visible light communication is realized by using a single-stage double-tube forward double-output synchronous rectification circuit as a driving circuit of the LED and then using a QAM (quadrature amplitude modulation) modulation mode. The double-tube forward-excited single-stage PFC converter realizes high efficiency, high PF and output current control. The following describes the visible light communication modulation method based on the single-stage forward LED driving circuit according to the present invention, as shown in fig. 2, fig. 3, fig. 4 and fig. 5.
Referring to fig. 2, a schematic diagram of mode 1 in which a primary side switch of the single-stage forward circuit is turned on and a first winding output of the secondary side of the double-transistor forward circuit is turned on is shown. Single-stage forward circuit switch tube S1、S2Conducting and storing energy by the PFC inductor L; DC bus capacitor CbSupplying power, transferring energy to secondary side of transformer T, switching tube S3Conduction, S5Cut off, the first winding output transfers energy to the load LED, and the winding Ns1One path of synchronous rectification circuit outputs ripple wave with the waveform ofv A (t) by controlling the switching tube S3And S5On/off, changev A (t) a phase; switch tube S6Conduction, S4Cut-off, DC-DC inductance LbThrough a switching tube S6Afterflow; winding Ns2The other path of synchronous rectification circuit outputs a ripple wave with the waveform ofv B (t) by controlling the switching tube S4And S6On/off, changev B (t) a phase; two-phase conversion circuit outputv C (t) the waveform delivers energy to the load LED.
Referring to fig. 3, it is a schematic diagram of mode 2 in which the primary side switch of the single-stage forward circuit is turned on and the two windings of the secondary side of the double-transistor forward circuit are turned on. Single-stage forward circuit switch tube S1、S2Conducting and storing energy by the PFC inductor L; DC bus capacitor CbSupplying power, transferring energy to secondary side of transformer T, switching tube S3、S4Conduction, S5、S6Cut-off, two-phase conversion circuit outputv C (t) the waveform delivers energy to the load LED.
Referring to fig. 4, a schematic diagram of mode 3 in which the primary side switch of the single-stage forward circuit is turned on and the output of the secondary side secondary winding of the double-transistor forward circuit is turned on is shown. Single-stage forward circuit switch tube S1、S2Conducting and storing energy by the PFC inductor L; DC bus capacitor CbSupplying power, transferring energy to secondary side of transformer T, switching tube S4Conduction, S6Cut off, the second winding output transfers energy to the load LED, and the winding Ns2The other path of synchronous rectification circuit outputs a ripple wave with the waveform ofv B (t) by controlling the switching tube S4And S6On/off, changev B (t) a phase; switch tube S5Conduction, S3Cut-off, DC-DC inductance LaThrough a switching tube S5Afterflow; by controlling the switching tube S3And S5On/off, changev A (t) a phase; two-phase conversion circuit outputv C (t) the waveform delivers energy to the load LED.
Referring to fig. 5, there is shown a schematic diagram of the operating principle of the sum of two sinusoidal waveforms having the same amplitude and phase frequency but different phases. The third waveform in the figure (v C (t)) is the sum of two sine wavesv A (t)) and (v B (t)), both having the same amplitude and frequency, but different phases (respectively- γ)12. pi. and-gamma 22. pi); the sum of these two sinusoidal waveforms is equal to a third sinusoidal waveform with the same frequency (v C (t)); the expression is as follows:
by adjusting the switching tube S3、S5And S4、S6On and off, changev A (t) andv B (t) phase position, the final output voltage can be adjustedv C (t) phase and amplitude, when the phase difference α of the output voltage ripple of the first phase winding synchronous rectification circuit and the output voltage ripple of the second phase winding synchronous rectification circuit decreases,v C (t) increases in amplitude, and as α increases,v C (t) decreases in amplitude, and when the phase sum 2 · β value of the first phase winding output voltage ripple and the second phase winding output voltage ripple increases,v C (t) decreases, and when the value of β decreases,v C the phase of (t) increases. So that the total output voltage ripplev C the amplitude of (t) depends on the β parameter and the phase depends on the beta parameter, where gamma1、γ2therefore, the sine wave with independently controllable amplitude and phase can be generated by the sum of two sine waves with the same amplitude, the same frequency and controllable phase, so that the ripple of the output voltage can be adjusted by respectively modulating the ripple phase of the voltage output by the two-phase synchronous rectification circuit, thereby achieving the visible light communication data modulation.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. A visible light communication modulation circuit based on a single-stage forward LED drive circuit is characterized by comprising: the LED lamp driving circuit comprises a BoostPFC converter circuit, a single-stage double-tube forward double-output synchronous rectifying circuit and an LED lamp load; the Boost PFC converter circuit and the single-stage double-tube forward double-output synchronous rectification circuit are integrated into a single-stage circuit; and the secondary side of the single-stage double-tube forward double-output synchronous rectification circuit is connected with two ends of the LED lamp load.
2. The visible light communication modulation circuit based on the single-stage forward LED drive circuit according to claim 1, wherein: and the alternating current power supply is connected with the Boost PFC converter circuit through the rectifying circuit.
3. The visible light communication modulation circuit based on the single-stage forward LED drive circuit according to claim 1, wherein: the Boost PFC converter circuit includes: PFC inductance L, first power MOS switch tube S1The first stepA power diode D1DC bus capacitor Cb(ii) a The single-stage double-tube forward double-output synchronous rectification circuit and the Boost PFC converter circuit multiplex a first power MOS switching tube S1A first power diode D1The method also comprises the following steps: high-frequency transformer T and second power MOS switch tube S2A third power MOS switch tube S3Fourth power MOS switch tube S4The fifth power MOS switch tube S5Sixth power MOS switch tube S6A second power diode D2DC bus capacitor CbOutput electrolytic capacitor C0And a DC-DC inductor LaAnd LbA double-output synchronous rectification forward DC-DC unit is formed; the rectification circuit comprises a rectifier bridge BD consisting of 4 diodes1。
4. The visible light communication modulation circuit based on the single-stage forward LED drive circuit according to claim 3, wherein: AC source is connected with the diode rectifier bridge BD1(ii) a The diode rectifier bridge BD1The positive output end of the inductor is connected with a connected with the PFC inductor L1Terminal a of the PFC inductance L2End-connected first power MOS switch tube S1Drain electrode of (1), first power diode D1Anode of and primary winding N of high-frequency transformer TpA non-homonymous end of (c); the first power MOS switch tube S1Is connected to a second power diode D2Anode and dc bus capacitor CbA negative terminal of (a); the first power diode D1The cathode of the first power MOS switch tube is connected with a second power MOS switch tube S2Drain electrode of (2) and DC bus capacitor CbA positive terminal of; the second power MOS switch tube S2The source electrode of the high-frequency transformer T is connected with a primary winding N of the high-frequency transformer TpAnd a second power diode D2A cathode of (a); the secondary winding N of the high-frequency transformer Ts1The same name end of the third power MOS switch tube S3A drain electrode of (1); the third power MOS switch tube S3Is connected with a fifth power MOS switch tube S5And DC-DC inductor LaB of (a)1A terminal; the DC-DC inductor LaB of (a)2Connecting a DC-DC inductor LbC of2End and output electrolytic capacitor C0And a positive terminal of the LED lamp load; the secondary winding N of the high-frequency transformer Ts2The same name end of the first power MOS switch tube is connected with a fourth power MOS switch tube S4A drain electrode of (1); the fourth power MOS switch tube S4Is connected with a DC-DC inductor LbC of1Terminal and sixth power MOS switch tube S6A drain electrode of (1); the sixth power MOS switch tube S6The source electrode of the high-frequency transformer is connected with a secondary winding N of the high-frequency transformer Ts2Non-homonymous terminal of and output electrolytic capacitor C0Negative terminal of the fifth power MOS switch tube S5Source electrode of the high-frequency transformer T and a secondary winding N of the high-frequency transformer Ts1The non-homonymous terminal of (1) and the negative terminal of the LED lamp load; the DC-DC inductor LbC of2End-connected DC-DC inductor LaB of (a)2End and output electrolytic capacitor C0And the positive terminal of the LED lamp load.
5. The visible light communication modulation circuit based on the single-stage forward LED drive circuit according to claim 4, wherein: the high-frequency transformer T is a single-end excitation high-frequency transformer, the secondary side of the high-frequency transformer T is double-winding output, and the primary side excitation winding N ispEnd of same name and secondary winding Ns1、Ns2The excitation homonymous terminals of the same.
6. The visible light communication modulation circuit based on the single-stage forward LED drive circuit according to claim 4, wherein: the diode rectifier bridge BD1The adopted 4 diodes are all rectification slow power diodes; the first power diode D1A second power diode D2A third power diode D3A fourth power diode D4A fifth power diode D5Sixth power diode D6Are all fast recovery power diodes.
7. The modulation method of the visible light communication modulation circuit based on the single-stage forward LED drive circuit is characterized in that: the high frequency transformerSecondary winding N of Ts1And Ns2Voltage V oninAre of the same amplitude and phase; by separately controlling a third power MOS switch transistor S3Fourth power MOS switch tube S4And a fifth power MOS switch tube S5Sixth power MOS switch tube S6The on-off time of the single-stage double-tube forward double-output synchronous rectification circuit is adjusted to output a switch node voltage vX1、vX2To control the high-frequency spectrum amplitude and phase of the output current ripple to realize the data modulation of the LED visible light communication, wherein the third power MOS switch transistor S3And a fifth power MOS switch tube S5Complementary control forms one VLC communication signal of output phase and amplitude; the fourth power MOS switch tube S4And a sixth power MOS switch tube S6Complementary control is formed, wherein the other path outputs a phase and amplitude VLC communication signal; the switching frequency and the duty ratio of each phase of switching tube are the same.
8. The modulation method of the visible light communication modulation circuit based on the single-stage forward LED drive circuit is characterized in that: adopting QAM communication modulation method, the third power MOS switch tube S3And a fifth power MOS switch tube S5Complementary control forms one VLC communication signal of output phase and amplitude; the fourth power MOS switch tube S4And a sixth power MOS switch tube S6The complementary control forms one of the two paths of output phase and magnitude VLC communication signals.
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| CN112187360A (en) * | 2020-10-30 | 2021-01-05 | 福州大学 | Average power feedback LED illumination visible light communication modulation method |
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