CN108307558B - full-bridge LED constant current driving power supply with multi-path current-sharing output - Google Patents
full-bridge LED constant current driving power supply with multi-path current-sharing output Download PDFInfo
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- CN108307558B CN108307558B CN201810046871.5A CN201810046871A CN108307558B CN 108307558 B CN108307558 B CN 108307558B CN 201810046871 A CN201810046871 A CN 201810046871A CN 108307558 B CN108307558 B CN 108307558B
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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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Abstract
The invention discloses a full-bridge LED constant current driving power supply with multi-path current-sharing output, which comprises a PFC circuit, a constant current network, a current-sharing network and 4 LED lamp load circuits. The PFC circuit realizes the function of power factor correction and provides stable voltage for the constant current network; the constant current network realizes the constant current output of the 4 paths of LED lamp loads through the full-bridge resonance circuit; the current-sharing network realizes the current-sharing output of 4 paths of LED lamp loads through the current-sharing capacitor. The multi-path current-sharing output full-bridge LED constant current circuit can provide constant current and current-sharing output for four paths of LED loads with the same or different numbers, and has the advantages of simple circuit, high efficiency, small output ripple, good constant current and current-sharing effect and the like.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to a full-bridge LED constant current driving power supply with multi-path current-sharing output.
Background
The LED light source has the characteristics of high luminous efficiency and long service life, so that the LED light source is widely applied to the fields of household, business, industry and the like. The single chip packaging power of most LED light sources in the current market is l-3 w. Therefore, in most lighting situations, a plurality of LED light sources need to be used simultaneously to meet the requirement of illumination intensity, and when the plurality of LED light sources are operated simultaneously, the requirement of uniform brightness must be met.
the current-voltage characteristic of the LED conforms to an exponential relationship, i.e., a small change in voltage causes a significant change in current. The luminosity properties of the LED, such as brightness, luminous flux, luminous efficiency and the like, are directly related to the LED driving current, and the LED is gradually known by adopting constant current driving.
to meet the requirement of uniform brightness, it is necessary to ensure that the current flowing through each LED is equal. The simplest method is to connect a plurality of LED lamps in series, but the reliability of the series connection is low, when any lamp is damaged, the whole LED branch cannot work, the number of the series connection is limited, the voltage of the LED branch is usually dozens of volts, and the voltage does not exceed the safety voltage limit value. Therefore, most LED lighting uses a combination of series and parallel LEDs. The LED turn-on voltage is affected by the operating temperature, time, and individual differences, in addition to the drive current. When a plurality of LED branches are connected in parallel to the same voltage source, the current in each LED branch is not completely equal due to the difference of the conducting voltage, the LED lamp of the branch with large current is easy to have light decay, aging acceleration or even extinguishment, and the service life and the reliability of the LED lamp are reduced. In order to ensure that the output of the LED meets the requirements of brightness, chromaticity-consistency and the like, the current equalization of each LED module must be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a full-bridge LED constant current driving power supply with multi-path current-sharing output, which is used for providing constant current and current-sharing output for four paths of LED loads with the same or different numbers.
In order to achieve the purpose, the technical scheme of the invention is as follows: a full-bridge LED constant current driving power supply with multi-path current-sharing output comprises a PFC circuit, a constant current network, a current-sharing network and an LED lamp load circuit,
the PFC circuit realizes a power factor correction function and provides stable voltage for a constant current network;
The constant current network comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a first resonant inductor, a second resonant inductor, a first resonant capacitor and a second resonant capacitor;
The current-equalizing network comprises a first current-equalizing capacitor, a second current-equalizing capacitor and a third current-equalizing capacitor;
the LED lamp load circuit comprises a first LED lamp string, a second LED lamp string, a third LED lamp string, a fourth LED lamp string, a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode;
the drain electrode of the first switch tube is connected with the first output end of the PFC circuit and the drain electrode of the third switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube and one end of the first resonance inductor, the source electrode of the second switch tube is connected with the second output end of the PFC circuit, one end of the first resonance capacitor, one end of the second resonance capacitor and the source electrode of the fourth switch tube, the source electrode of the third switch tube is connected with the drain electrode of the fourth switch tube and one end of the second resonance inductor, the other end of the first resonance inductor is connected with one end of the first current-sharing capacitor, one end of the second current-sharing capacitor and the other end of the first resonance capacitor, and the other end of the second resonance inductor is connected with one end of the third current-sharing capacitor and the other end of the second resonance capacitor,
the other end of the first current-sharing capacitor is connected with the anode of a first rectifier diode and the cathode of a second rectifier diode, the cathode of the first rectifier diode is connected with one end of a first LED lamp string, the anode of the second rectifier diode is connected with one end of a second LED lamp string, the other end of the second current-sharing capacitor is connected with the anode of a third rectifier diode and the cathode of a fourth rectifier diode, the cathode of the third rectifier diode is connected with one end of a third LED lamp string, the anode of the fourth rectifier diode is connected with one end of a fourth LED lamp string, and the other end of the second LED lamp string and the other end of the third LED lamp string are connected with the other end of the third current-sharing capacitor; the other end of the first LED lamp string and the other end of the fourth LED lamp string are connected with the source electrode of the second switch tube, and the conduction directions of the first LED lamp string, the second LED lamp string, the third LED lamp string and the fourth LED lamp string are respectively the same as the conduction directions of the first rectifier diode, the second rectifier diode, the third rectifier diode and the fourth rectifier diode.
Furthermore, the first LED light string, the second LED light string, the third LED light string and the fourth LED light string are respectively connected in parallel with a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor.
furthermore, the number of the LED lamps in the first LED lamp string, the second LED lamp string, the third LED lamp string and the fourth LED lamp string may be the same or different.
Furthermore, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are complementary, the first switch tube and the fourth switch tube are switched on and off simultaneously, and the second switch tube and the third switch tube are switched on and off simultaneously.
Compared with the prior art, the invention has the beneficial effects that: the constant current and current sharing output can be provided for four paths of LED loads with the same or different numbers, and the LED constant current and current sharing circuit has the advantages of simple circuit, high efficiency, small output ripple, good constant current and current sharing effect and the like;
The sum of the 4 paths of LED lamp currents is twice of the output current of the constant current network, and the LED lamp has the advantages of small current stress of a switching tube, small output ripple and the like under the same output power.
Drawings
FIG. 1 is a circuit schematic diagram of a full-bridge LED constant current driving power supply of the present invention;
FIG. 2 is a graph showing current waveform simulations for four LED load resistors of 20 ohm, 60 ohm, 100 ohm, and 120 ohm, respectively, in accordance with an embodiment of the present invention;
FIG. 3 is a current waveform simulation diagram for 20 ohm for all four LED load resistors in one embodiment of the present invention;
FIG. 4 is a current waveform simulation diagram of 120 ohm-hour current for all four LED load resistors in accordance with an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
As shown in FIG. 1, a full-bridge LED constant current driving power supply with multi-path current-sharing output comprises a PFC circuit, a constant current network, a current-sharing network and an LED lamp load circuit,
The PFC circuit realizes the function of power factor correction, provides stable voltage for a constant current network and is connected with the input of a power grid;
the constant current network comprises a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a first resonant inductor L1, a second resonant inductor L2, a first resonant capacitor C1 and a second resonant capacitor C5;
the current-equalizing network comprises a first current-equalizing capacitor C2, a second current-equalizing capacitor C3 and a third current-equalizing capacitor C4;
The LED lamp load circuit comprises a first LED lamp string LED11, a … LED1n, a second LED lamp string LED21, a … LED2n, a third LED lamp string LED31, a … LED3n, a fourth LED lamp string LED41, a … LED4n, a first rectifier diode D10, a second rectifier diode D20, a third rectifier diode D30 and a fourth rectifier diode D40;
the drain of the first switch tube Q1 is connected with the first output end of the PFC circuit and the drain of the third switch tube Q3, the source of the first switch tube Q1 is connected with the drain of the second switch tube Q2 and one end of the first resonant inductor L1, the source of the second switch tube Q2 is connected with the second output end of the PFC circuit, one end of the first resonant capacitor C1, one end of the second resonant capacitor C5 and the source of the fourth switch tube Q4, the source of the third switch tube Q3 is connected with the drain of the fourth switch tube Q4 and one end of the second resonant inductor L2, the other end of the first resonant inductor L1 is connected with one end of the first equalizing capacitor C2, one end of the second equalizing capacitor C3 and the other end of the first resonant capacitor C1, the other end of the second resonant inductor L2 is connected with one end of the third capacitor C4 and the other end of the second resonant capacitor C5,
The other end of the first current-sharing capacitor C2 is connected with the anode of a first rectifier diode D10 and the cathode of a second rectifier diode D20, the cathode of the first rectifier diode D10 is connected with one end of a first LED string LED11, … LED1n, the anode of the second rectifier diode D20 is connected with one end of a second LED string LED21, … LED2n, the other end of the second current-sharing capacitor C3 is connected with the anode of a third rectifier diode D30 and the cathode of a fourth rectifier diode D30, the cathode of the third rectifier diode D30 is connected with one end of a third LED string LED 30, 30 LED3 30, the anode of the fourth rectifier diode D30 is connected with one end of a fourth LED string LED 30, 30 LED4 30, the other end of the second LED string 30, 30 LED2 LED string 30, the third LED string 30, and the other end of the second LED string 30 is connected with the other end of the current-sharing capacitor D5972; the other ends of the first LED string LED11, … LED1n and the fourth LED string LED41, … LED4n are connected to the source of the second switch tube Q2, and the conduction directions of the first LED string LED11, … LED1n, the second LED string LED21, … LED2n, the third LED string LED31, … LED3n, the fourth LED string LED41, … LED4n are respectively the same as the conduction directions of the first rectifier diode D10, the second rectifier diode D20, the third rectifier diode D30 and the fourth rectifier diode D40.
The first LED lamp string LED11, … LED1n, the second LED lamp string LED21, … LED2n, the third LED lamp string LED31, … LED3n, the fourth LED lamp string LED41 and the … LED4n are respectively connected with a first filter capacitor C10, a second filter capacitor C20, a third filter capacitor C30 and a fourth filter capacitor C40 in parallel.
the numbers of the LED lamps in the first LED lamp string LED11, the … LED1n, the second LED lamp string LED21, … LED2n, the third LED lamp string LED31, the … LED3n, the fourth LED lamp string LED41, the … LED4nLED41 and the … LED4n can be the same or different.
The first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are in complementary work, the first switch tube Q1 and the fourth switch tube Q4 are switched on and off at the same time, and the second switch tube Q2 and the third switch tube Q3 are switched on and off at the same time.
A full-bridge constant-current resonant network is formed by first to fourth switching tubes Q1, Q2, Q3, Q4, a first resonant inductor L1, a second resonant inductor L2, a first resonant capacitor C1 and a second resonant capacitor C5, so that the total current of two paths of the second LED lamp string and the third LED lamp string is constant; the output of the resonant network is connected with four paths of LED loads through first to third current-sharing capacitors C2, C3 and C4, the full-bridge constant-current network works in a resonant state to generate a constant alternating current signal, and the constant alternating current signal supplies power to the four paths of LED loads through the first to third current-sharing capacitors C2, C3 and C4. The first current-sharing capacitor C2 realizes current sharing of the first path and the second path of LED lamp strings, the second current-sharing capacitor C3 realizes current sharing of the third path and the fourth path of LED lamp strings, and the third current-sharing capacitor C4 realizes current sharing of the second path and the third path of LED lamp strings. Because the four paths of LED circuits are current-sharing, each path of LED lamp string works in a constant current mode.
Two ends of the second path of LED load and two ends of the third path of LED load are both connected with the current-sharing capacitor, one ends of the first path of LED load and the fourth path of LED load are respectively connected with the current-sharing capacitor, and the other ends of the first path of LED load and the fourth path of LED load are connected with the common end of the circuit after being connected, so that the sum of the current of the four paths of LED lamps is twice of the output current of the constant current network.
FIG. 2 is a graph showing current waveform simulations for four-way LED load resistors of 20, 60, 100 and 120 ohms, respectively; FIG. 3 is a current waveform simulation diagram when the four LED load resistors are all 20 ohms; FIG. 4 is a current waveform simulation diagram of the four-way LED load resistors all having a value of 120 ohms. Different load resistors respectively represent different numbers of LED lamp strings. As can be seen from fig. 2 to 4, when the four load resistors are the same or different, the currents flowing through the four LED strings in the steady state are substantially equal, so that the constant current and the current sharing operation of the four LED strings are realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and achievements of the present invention, and it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A full-bridge LED constant current driving power supply with multi-path current-sharing output is characterized by comprising a PFC circuit, a constant current network, a current-sharing network and an LED lamp load circuit,
the PFC circuit realizes a power factor correction function and provides stable voltage for a constant current network;
The constant current network comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a first resonant inductor, a second resonant inductor, a first resonant capacitor and a second resonant capacitor;
The current-equalizing network comprises a first current-equalizing capacitor, a second current-equalizing capacitor and a third current-equalizing capacitor;
the LED lamp load circuit comprises a first LED lamp string, a second LED lamp string, a third LED lamp string, a fourth LED lamp string, a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode;
The drain electrode of the first switch tube is connected with the first output end of the PFC circuit and the drain electrode of the third switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube and one end of the first resonance inductor, the source electrode of the second switch tube is connected with the second output end of the PFC circuit, one end of the first resonance capacitor, one end of the second resonance capacitor and the source electrode of the fourth switch tube, the source electrode of the third switch tube is connected with the drain electrode of the fourth switch tube and one end of the second resonance inductor, the other end of the first resonance inductor is connected with one end of the first current-sharing capacitor, one end of the second current-sharing capacitor and the other end of the first resonance capacitor, and the other end of the second resonance inductor is connected with one end of the third current-sharing capacitor and the other end of the second resonance capacitor,
the other end of the first current-sharing capacitor is connected with the anode of a first rectifier diode and the cathode of a second rectifier diode, the cathode of the first rectifier diode is connected with one end of a first LED lamp string, the anode of the second rectifier diode is connected with one end of a second LED lamp string, the other end of the second current-sharing capacitor is connected with the anode of a third rectifier diode and the cathode of a fourth rectifier diode, the cathode of the third rectifier diode is connected with one end of a third LED lamp string, the anode of the fourth rectifier diode is connected with one end of a fourth LED lamp string, and the other end of the second LED lamp string and the other end of the third LED lamp string are connected with the other end of the third current-sharing capacitor; the other end of the first LED lamp string and the other end of the fourth LED lamp string are connected with a source electrode of the second switch tube, the conducting directions of the first LED lamp string, the second LED lamp string, the third LED lamp string and the fourth LED lamp string are respectively the same as the conducting directions of the first rectifier diode, the second rectifier diode, the third rectifier diode and the fourth rectifier diode, and the number of the LED lamps in the first LED lamp string, the second LED lamp string, the third LED lamp string and the fourth LED lamp string can be the same or different.
2. the full-bridge LED constant current driving power supply according to claim 1, wherein the first LED lamp string, the second LED lamp string, the third LED lamp string and the fourth LED lamp string are respectively connected in parallel with a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor.
3. The full-bridge LED constant-current driving power supply according to claim 1 or 2, wherein the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are complementary, the first switching tube and the fourth switching tube are simultaneously turned on and off, and the second switching tube and the third switching tube are simultaneously turned on and off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046871.5A CN108307558B (en) | 2018-01-18 | 2018-01-18 | full-bridge LED constant current driving power supply with multi-path current-sharing output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810046871.5A CN108307558B (en) | 2018-01-18 | 2018-01-18 | full-bridge LED constant current driving power supply with multi-path current-sharing output |
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| CN108307558A CN108307558A (en) | 2018-07-20 |
| CN108307558B true CN108307558B (en) | 2019-12-17 |
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| CN102271438B (en) * | 2010-06-04 | 2013-12-25 | 金威贸易有限公司 | Lighting device using even alternating current (AC) for driving light-emitting diodes (LEDs) |
| CN102186296A (en) * | 2011-05-20 | 2011-09-14 | 台达能源技术（上海）有限公司 | Current balancing circuit |
| CN104066252B (en) * | 2014-07-03 | 2016-03-30 | 东南大学 | CLC constant-current network type LED is from flow equalizing circuit and control method thereof |
| CN105744671B (en) * | 2016-02-23 | 2017-12-08 | 福州大学 | A kind of passive LED drive power flowed of non-isolated multichannel |
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Granted publication date: 20191217 Termination date: 20220118 |