CN209861226U - HB-LED driver - Google Patents
HB-LED driver Download PDFInfo
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- CN209861226U CN209861226U CN201920533248.2U CN201920533248U CN209861226U CN 209861226 U CN209861226 U CN 209861226U CN 201920533248 U CN201920533248 U CN 201920533248U CN 209861226 U CN209861226 U CN 209861226U
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Abstract
The utility model discloses an HB-LED driver, which comprises a single-phase synchronous buck converter, a multiphase asynchronous buck converter, an HB-LED component and two PWM modulation modules; the single-phase synchronous buck converter comprises a first power supply and two MOS (metal oxide semiconductor) tubes connected in series; the multiphase asynchronous buck converter comprises a second power supply and at least two phase circuits connected in parallel, wherein each phase circuit comprises an MOS (metal oxide semiconductor) tube and a diode; the HB-LED assembly includes a number of HB-LEDs in series. The utility model directly connects the source of the MOS tube with the cathode of the power supply, and directly uses the power supply for driving the MOS tube of the multiphase asynchronous buck converter, so that the driving task becomes easier, and the data transmission rate of the driver is greatly improved; meanwhile, under the action of the single-phase synchronous buck converter, the high power efficiency of the HB-LED assembly can be guaranteed, reliable and economical communication and illumination functions are achieved, and the high cost performance is achieved.
Description
Technical Field
The utility model belongs to the technical field of optical communication, a HB-LED driver is related to.
Background
The light emitting diode (HB-LED) is used as a semiconductor solid light source, has the obvious advantages of energy conservation, environmental protection, long service life, high response speed, no radiation, no electromagnetic interference, no toxic gas, good impact resistance, high luminous efficiency, easy control and the like, is considered as a fourth generation light source following incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps, and has wide application in various fields such as illumination, displays, car lamps and the like.
Visible Light Communication (VLC) technology has attracted attention in recent years, and since data is not easily disturbed and captured in visible light communication, optical communication devices are simple to manufacture, are not easily damaged and demagnetized, and can be used for manufacturing wireless light encryption keys. Compared with the microwave technology, the visible light communication technology has quite abundant spectrum resources, which is incomparable with the common microwave communication and wireless communication; meanwhile, the visible light communication can use any communication protocol and is suitable for any environment; in the aspect of safety, compared with the traditional magnetic material, the problem of demagnetization is not needed to worry, and the communication content is not needed to be stolen by others; the wireless optical communication equipment assumes flexible boundaries, has low cost and is suitable for large-scale popularization and application.
Currently, high brightness LED (HB-LED) lighting is commonly used in visible light communication, and information is transmitted by rapidly changing the intensity of light. One of the most important problems is that in order to obtain an HB-LED driver with high transmission data rate in VLC, the conventional HB-LED driver generally adopts a linear power amplifier, but the lighting power efficiency of the HB-LED is obviously damaged, and the power efficiency of the HB-LED is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide a HB-LED driver.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a HB-LED driver comprises a single-phase synchronous buck converter, a multi-phase asynchronous buck converter, an HB-LED assembly and two PWM modulation modules;
the single-phase synchronous buck converter comprises a first power supply and two MOS (metal oxide semiconductor) tubes connected in series; the drain electrode of the first MOS tube is connected with the anode of the first power supply, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the grid electrode of the first MOS tube is connected with the output end of the first PWM modulation module; the source electrode of the second MOS tube is connected with the cathode of the first power supply;
the multiphase asynchronous buck converter comprises a second power supply and at least two phase circuits connected in parallel, wherein each phase circuit comprises an MOS (metal oxide semiconductor) tube and a diode; the source electrode of the MOS tube is connected with the negative electrode of the second power supply, the drain electrode of the MOS tube is connected with the positive electrode of the diode, and the grid electrode of the MOS tube is connected with the output end of the second PWM modulation module; the cathode of the diode is connected with the anode of the second power supply;
the HB-LED assembly comprises a plurality of HB-LEDs connected in series; the positive pole of the HB-LED assembly is connected with the positive pole of the output end of the multiphase asynchronous buck converter, the negative pole of the HB-LED assembly is connected with the negative pole of the output end of the single-phase synchronous buck converter, and the negative pole of the output end of the multiphase asynchronous buck converter is connected with the positive pole of the output end of the single-phase synchronous buck converter.
The utility model discloses further improvement lies in:
the multi-phase converter output voltage filter is used for reducing output voltage ripples of the multi-phase asynchronous buck converter;
the input end of the output voltage filter of the multiphase converter is connected with the diode of the phase circuit in parallel; the output ends of all the multiphase converters are connected in series, the positive electrodes of the output voltage filters are connected with the positive electrode of the HB-LED assembly, and the negative electrodes of the output voltage filters are connected with the positive electrode of the output end of the single-phase synchronous buck converter.
The multi-phase converter also comprises a multi-phase converter output voltage filter and a plurality of inductors;
the input end of the output voltage filter of the multiphase converter is connected with a diode of one phase circuit of the multiphase asynchronous buck converter in parallel, the anode of the output end is connected with the anode of the HB-LED assembly, and the cathode of the output end is connected with the anode of the output end of the single-phase synchronous buck converter;
in the other phase circuits of the multiphase asynchronous buck converter, the diode of each phase circuit is connected with the wire outlet end of the input end inductor of the output voltage filter of the multiphase converter through an inductor.
The multiphase converter output voltage filter is a butterworth filter.
The single-phase converter output voltage filter is used for reducing the output voltage ripple of the single-phase synchronous buck converter;
the positive electrode of the input end of the single-phase converter output voltage filter is connected with the drain electrode of the second MOS tube, and the negative electrode of the input end of the single-phase converter output voltage filter is connected with the source electrode of the second MOS tube;
the positive electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the output end of the multiphase asynchronous buck converter, and the negative electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the HB-LED assembly.
The single-phase converter output voltage filter comprises a first inductor and a first capacitor;
the inlet end of the first inductor is connected with the drain electrode of the second MOS tube, and the outlet end of the first inductor is connected with the inlet end of the first capacitor; the outlet end of the first capacitor is connected with the source electrode of the second MOS tube; the input end of the first capacitor is simultaneously connected with the cathode of the output end of the multiphase asynchronous buck converter, and the output end of the first capacitor is simultaneously connected with the cathode of the HB-LED assembly.
The HB-LED assembly includes 6 HB-LEDs connected in series.
The MOS transistor is a metal oxide semiconductor field effect transistor.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model adjusts the output of the multiphase asynchronous buck converter and the output of the single-phase synchronous buck converter, further adjusts the voltage of the HB-LED assembly, and changes the illumination intensity of the HB-LED assembly; the light intensity signal of the HB-LED component acts on a receiver of the visible light communication device to complete driving. The source electrode of the MOS tube is connected to the negative electrode of the power supply, and the power supply is used for driving the MOS tube, so that the driving task becomes easier, and the data transmission rate is greatly improved. Meanwhile, the power layer of the single-phase synchronous buck converter consists of a small number of elements, only comprises two MOS (metal oxide semiconductor) tubes and one power supply, and is high in efficiency and simple in model. The utility model ensures the lighting of the HB-LED component, and has better economical efficiency; it is achieved that the lighting of the HB-LED can be very power efficient also at high data transfer rates.
Furthermore, a filter is arranged at the output end of each phase circuit of the multiphase asynchronous buck converter, so that the output voltage ripple of the multiphase asynchronous buck converter is greatly reduced, and the operation stability of the driver is greatly improved.
Drawings
Fig. 1 is a circuit topology diagram of the present invention.
Wherein: 1-a first power supply; 2-a second power supply; 3-a first MOS tube; 4-a second MOS tube; 5-a third MOS tube; 6-a fourth MOS tube; 7-a first diode; 8-a second diode; a 9-HB-LED assembly; 10-a first inductance; 11-a second inductance; 12-a third inductance; 13-a fourth inductance; 14-a first capacitance; 15-a second capacitance; 16-third capacitance.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below 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 efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the HB-LED driver of the present invention includes a single-phase synchronous buck converter, a multiphase asynchronous buck converter, a HB-LED assembly 9, and two PWM modulation modules.
The single-phase synchronous buck converter comprises a first power supply 1 and two MOS (metal oxide semiconductor) tubes connected in series; the drain electrode of the first MOS tube 3 is connected with the anode of the first power supply 1, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube 4, and the grid electrode of the first MOS tube is connected with the output end of the first PWM modulation module; the source electrode of the second MOS tube 4 is connected with the negative electrode of the first power supply 1; the multiphase asynchronous buck converter comprises a second power supply 2 and at least two phase circuits connected in parallel, wherein each phase circuit comprises an MOS (metal oxide semiconductor) transistor and a diode; the source electrode of the MOS tube is connected with the cathode of the second power supply 2, the drain electrode of the MOS tube is connected with the anode of the diode, and the grid electrode of the MOS tube is connected with the output end of the second PWM modulation module; the cathode of the diode is connected with the anode of the second power supply 2; the HB-LED assembly 9 comprises a plurality of HB-LEDs connected in series; the positive pole of the HB-LED assembly 9 is connected with the positive pole of the output end of the multiphase asynchronous buck converter, the negative pole of the HB-LED assembly 9 is connected with the negative pole of the output end of the single-phase synchronous buck converter, and the negative pole of the output end of the multiphase asynchronous buck converter is connected with the positive pole of the output end of the single-phase synchronous buck converter. By adjusting the output VO-H of the multiphase asynchronous buck converter and the output VO-L of the single-phase synchronous buck converter, the voltage of the HB-LED assembly 9 is further adjusted, the illumination intensity of the HB-LED assembly 9 is changed, and the light intensity signal of the HB-LED assembly 9 acts on a receiver PDA10A-EC of the visible light communication device, so that the driving is completed.
The utility model relates to a HB-LED driver still includes a plurality of heterogeneous converter output voltage wave filters that are used for reducing heterogeneous asynchronous buck converter output voltage ripple and is used for reducing single-phase converter output voltage wave filter of single-phase synchronous buck converter output voltage ripple. The input end of the output voltage filter of the multiphase converter is connected with the diode of the phase circuit in parallel; the output ends of all the output voltage filters of the multiphase converters are connected in series, the positive electrodes of the output voltage filters are connected with the positive electrode of the HB-LED assembly 9, and the negative electrodes of the output voltage filters are connected with the positive electrode of the output end of the single-phase synchronous buck converter. The positive electrode of the input end of the single-phase converter output voltage filter is connected with the drain electrode of the second MOS tube 4, and the negative electrode of the input end of the single-phase converter output voltage filter is connected with the source electrode of the second MOS tube 4; the positive electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the output end of the multiphase asynchronous buck converter, and the negative electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the HB-LED assembly 9.
Preferably, a plurality of inductors are used for replacing part of the output voltage filters of the multiphase converter, and only one output voltage filter of the multiphase converter is reserved. The input end of the output voltage filter of the multiphase converter is connected with a diode of one phase circuit of the multiphase asynchronous buck converter in parallel, the anode of the output end is connected with the anode of the HB-LED assembly 9, and the cathode of the output end is connected with the anode of the output end of the single-phase synchronous buck converter; in the other phase circuits of the multiphase asynchronous buck converter, the diode of each phase circuit is connected with the wire outlet end of the input end inductor of the output voltage filter of the multiphase converter through an inductor.
The output voltage filter of the multiphase converter is a Butterworth filter, and the cut-off frequency of the filter is 4 mhz; the voltage ripple of the output voltage is greatly reduced through the output voltage filter of the multiphase converter, and the operation of the driver is more stable. The cut-off frequency of the output voltage filter of the single-phase converter is 20.5khz, and the quality factor q is 1.56.
Examples
In this embodiment, the single-phase synchronous buck converter includes a first power supply 1, a first MOS transistor 3, and a second MOS transistor 4; the models of the first MOS tube 3 and the second MOS tube 4 are TK7S10N1Z, and the switching frequencies are 250 khz; the model of the first inductor 10 of the single-phase converter output voltage filter is SER1390-333 MLB; the voltage of the first power supply 1 is 24V.
The multiphase asynchronous buck converter comprises a second power supply 2 and two parallel phase circuits. The two-phase asynchronous buck converter comprises a third MOS tube 5, a fourth MOS tube 6, a first diode 7, a second diode 8 and a second power supply 2, wherein the voltage of the second power supply 2 is 8.5V. The first diode 7 and the second diode 8 each employ a schottky diode DB 2430500L. The third MOS transistor 5 and the fourth MOS transistor 6 are both SSM3K336R, and the switching frequency is 10 mhz. The MOS transistors are all driven by an EL7156 integrated circuit. The source electrodes of the third MOS tube 5 and the fourth MOS tube 6 are both connected with the cathode of the first power supply 1, the drain electrode of the third MOS tube 5 is connected with the anode of the first diode 7, the drain electrode of the fourth MOS tube 6 is connected with the anode of the second diode 8, and the cathode electrodes of the first diode 7 and the second diode 8 are both connected with the anode of the second power supply 2. The second power supply 2 is used for driving the third MOS tube 5 and the fourth MOS tube 6 of the two-phase asynchronous buck converter, so that the driving task is easier, and the data transmission rate is greatly improved.
One of the two PWM modulation modules ensures that the multiphase converter has sufficient bandwidth to reproduce the communication signal, and the other ensures that the single phase converter reaches a certain bias point to perform the illumination function.
The output voltage filter of the multiphase converter is a fourth-order Butterworth filter and comprises a second inductor 11, a third inductor 12, a second capacitor 15 and a third capacitor 16; the wire inlet end of the second inductor 11 is connected with the anode of the first diode 7, and the wire outlet end is connected with one end of the second capacitor 15; the other end of the second capacitor 15 is connected with the cathode of the first diode 7; one end of the third inductor 12 is connected to the wire outlet end of the second inductor 11, and the other end is connected to one end of the third capacitor 16 and one end of the second capacitor 15; the other end of the third capacitor 16 is connected with one end of the second capacitor 15 connected with the cathode of the first diode 7; the outlet terminal of the fourth inductor 13 is connected to the anode of the second diode 8, and the inlet terminal is connected to the outlet terminal of the second inductor 11.
The HB-LED assembly 9 comprises 6 HB-LEDs connected in series, the anode of the HB-LED assembly 9 is connected with one end of a third capacitor 16 connected with a second capacitor 15, the cathode of the HB-LED assembly 9 is connected with one end of a first capacitor 14 connected with the source electrode of a second MOS tube 4, and the sum of the output VO-H of the two-phase asynchronous buck converter and the output VO-L of the single-phase synchronous buck converter is used as the driving voltage of the HB-LED assembly 9.
By adjusting the output VO-H of the two-phase asynchronous buck converter and the output VO-L of the single-phase synchronous buck converter, the driving voltage of the HB-LED assembly 9 is further adjusted, the illumination intensity of the HB-LED assembly 9 is changed, and the light intensity signal of the HB-LED assembly 9 acts on a receiver PDA10A-EC of the visible light communication device, so that the driving is completed. The source electrode of the MOS tube is connected to the negative electrode of the power supply, and the power supply is used for driving the MOS tube, so that the driving task becomes easier, and the data transmission rate is greatly improved. Meanwhile, the power layer of the single-phase synchronous buck converter consists of a small number of elements, only comprises two MOS (metal oxide semiconductor) tubes and one power supply, and is high in efficiency and simple in model. The utility model ensures the lighting of the HB-LED component, and has better economical efficiency; it is achieved that the lighting of the HB-LED can be very power efficient also at high data transfer rates.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (8)
1. An HB-LED driver is characterized by comprising a single-phase synchronous buck converter, a multi-phase asynchronous buck converter, an HB-LED assembly (9) and two PWM modulation modules;
the single-phase synchronous buck converter comprises a first power supply (1) and two MOS (metal oxide semiconductor) tubes connected in series; the drain electrode of the first MOS tube (3) is connected with the anode of the first power supply (1), the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube (4), and the grid electrode of the first MOS tube is connected with the output end of the first PWM modulation module; the source electrode of the second MOS tube (4) is connected with the negative electrode of the first power supply (1);
the multiphase asynchronous buck converter comprises a second power supply (2) and at least two phase circuits connected in parallel, wherein each phase circuit comprises an MOS (metal oxide semiconductor) tube and a diode; the source electrode of the MOS tube is connected with the negative electrode of the second power supply (2), the drain electrode of the MOS tube is connected with the positive electrode of the diode, and the grid electrode of the MOS tube is connected with the output end of the second PWM modulation module; the cathode of the diode is connected with the anode of the second power supply (2);
the HB-LED assembly (9) comprises a plurality of HB-LEDs connected in series; the positive electrode of the HB-LED assembly (9) is connected with the positive electrode of the output end of the multiphase asynchronous buck converter, the negative electrode of the HB-LED assembly (9) is connected with the negative electrode of the output end of the single-phase synchronous buck converter, and the negative electrode of the output end of the multiphase asynchronous buck converter is connected with the positive electrode of the output end of the single-phase synchronous buck converter.
2. The HB-LED driver of claim 1, further comprising a number of multiphase converter output voltage filters for reducing multiphase asynchronous buck converter output voltage ripples;
the input end of the output voltage filter of the multiphase converter is connected with the diode of the phase circuit in parallel; the output ends of all the output voltage filters of the multiphase converters are connected in series, the positive electrodes of the output voltage filters are connected with the positive electrode of the HB-LED assembly (9), and the negative electrodes of the output voltage filters are connected with the positive electrode of the output end of the single-phase synchronous buck converter.
3. The HB-LED driver of claim 1, further comprising a multiphase converter output voltage filter and a number of inductors;
the input end of the output voltage filter of the multiphase converter is connected with a diode of one phase circuit of the multiphase asynchronous buck converter in parallel, the anode of the output end is connected with the anode of the HB-LED assembly (9), and the cathode of the output end is connected with the anode of the output end of the single-phase synchronous buck converter;
in the other phase circuits of the multiphase asynchronous buck converter, the diode of each phase circuit is connected with the wire outlet end of the input end inductor of the output voltage filter of the multiphase converter through an inductor.
4. The HB-LED driver of claim 2 or 3, wherein the multiphase converter output voltage filter is a butterworth filter.
5. The HB-LED driver of claim 1, further comprising a single-phase converter output voltage filter for reducing single-phase synchronous buck converter output voltage ripple;
the positive electrode of the input end of the single-phase converter output voltage filter is connected with the drain electrode of the second MOS tube (4), and the negative electrode of the input end of the single-phase converter output voltage filter is connected with the source electrode of the second MOS tube (4);
the positive electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the output end of the multiphase asynchronous buck converter, and the negative electrode of the output end of the single-phase converter output voltage filter is connected with the negative electrode of the HB-LED assembly (9).
6. The HB-LED driver of claim 5, wherein the single phase converter output voltage filter comprises a first inductor (10) and a first capacitor (14);
the inlet terminal of the first inductor (10) is connected with the drain electrode of the second MOS tube (4), and the outlet terminal is connected with the inlet terminal of the first capacitor (14); the outlet end of the first capacitor (14) is connected with the source electrode of the second MOS tube (4); the incoming line end of the first capacitor (14) is simultaneously connected with the negative electrode of the output end of the multiphase asynchronous buck converter, and the outgoing line end of the first capacitor (14) is simultaneously connected with the negative electrode of the HB-LED assembly (9).
7. The HB-LED driver according to claim 1, wherein the HB-LED assembly (9) comprises 6 HB-LEDs connected in series.
8. The HB-LED driver of claim 1, wherein the MOS transistor is a metal oxide semiconductor field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920533248.2U CN209861226U (en) | 2019-04-18 | 2019-04-18 | HB-LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920533248.2U CN209861226U (en) | 2019-04-18 | 2019-04-18 | HB-LED driver |
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| CN209861226U true CN209861226U (en) | 2019-12-27 |
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| CN201920533248.2U Expired - Fee Related CN209861226U (en) | 2019-04-18 | 2019-04-18 | HB-LED driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963381A (en) * | 2019-04-18 | 2019-07-02 | 陕西科技大学 | A kind of HB-LED driver and driving method based on the series connection output of double converters |
-
2019
- 2019-04-18 CN CN201920533248.2U patent/CN209861226U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963381A (en) * | 2019-04-18 | 2019-07-02 | 陕西科技大学 | A kind of HB-LED driver and driving method based on the series connection output of double converters |
| CN109963381B (en) * | 2019-04-18 | 2023-12-22 | 陕西科技大学 | HB-LED driver based on double-converter serial output and driving method |
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Granted publication date: 20191227 Termination date: 20210418 |