CN102123552B - Multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply - Google Patents
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Abstract
The invention provides a multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply. Only one path needs to be controlled to realize constant-current output, automatic constant-current output of the other paths can be realized, and each path of output drive current drives one group of LED light sources; the multi-path constant-current high-power LED driving power supply comprises n power switches (S1, S2, S3...Sn), n diodes (D1, D2, D3...Dn), n inductors (L1, L2, L3...Ln) and n-1 capacitors (C1, C2...Cn-1). Each path of output drives one group of LED light sources, so that the problem of poor reliability caused by serial connection of excessive LED light sources is solved; and as only one path needs to be controlled to realize constant-current output, and automatic constant-current output of the other paths can be realized, a control circuit is simple. The multi-path constant-current high-power LED driving power supply has the advantages that the structure is simple, the constant-current performance is good, the cost is low, and the volume is small.
Description
Technical Field
The invention relates to an LED driving power supply, in particular to a multi-path constant-current high-power LED driving power supply.
Background
Semiconductor lighting is applied more and more widely in the field of lighting due to the advantages of high efficiency, energy conservation, environmental protection, long service life and the like. The power of a single LED is generally below 3W, so when the LED is used as a lighting lamp, a plurality of LEDs are always connected in series, and the number of the LEDs connected in series cannot be too large due to the reliability problem, so the series-parallel combination mode is generally adopted in the high-power lighting occasion. Generally, as many groups of LED light sources require as many LED driving power sources, the LED driving power sources have a contradiction between reliable operation and cost.
At present, most of LED driving power supplies for mains supply illumination adopt a high-frequency transformer link or multi-stage DC/DC voltage reduction, and the driving power supplies are too complex and have higher cost; in addition, the purpose of voltage reduction is achieved by using a power frequency transformer as a driving power supply, but the defects of overlarge volume and inconvenient installation of the driving power supply exist by using the power frequency transformer.
Disclosure of Invention
The invention aims to solve the technical problems of complex structure, large number, high cost, large volume and inconvenient installation of the conventional LED driver, and provides a multi-path constant-current high-power LED driving power supply which has simple structure, low cost, small volume and multi-path output capability.
In order to solve the technical problems, the invention adopts the following technical scheme: a multi-path constant-current high-power LED driving power supply is characterized in that only one path is controlled to realize constant-current output, the other paths can automatically realize constant current, and each path of driving current drives a group of LED light sources;
the multi-path constant-current high-power LED driving power supply comprises n power switches S1, S2 and S3 … Sn, n diodes D1, D2 and D3 … Dn, n inductors L1, L2 and L3 … Ln, and n-1 capacitors C1 and C2 … Cn-1; wherein,
the input end of the first power switch S1 is connected with the anode of the input direct current power supply, the output end is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is connected with a first inductor L1, the first inductor L1 is connected with the anode of a first group of LED light sources, and the cathode of the first group of LED light sources is connected with the cathode of the voltage-reducing constant current circuit; a first diode D1 is connected between the junction point of the first capacitor C1 and the first inductor L1 and the negative electrode of the voltage-reducing constant-current circuit, the anode of the first diode D1 is connected with the negative electrode of the voltage-reducing constant-current circuit, and the cathode of the first diode D1 is connected with the junction point;
the junction point of the first power switch S1 and the first capacitor C1 is connected with the input end of a second power switch S2, the output end of the second power switch S2 is connected with a second capacitor C2, a second inductor L2 is connected behind the second capacitor C2, the other end of the second inductor L2 is connected with the anode of a second group of LED light sources, and the cathode of the second group of LEDs is connected with the cathode of the voltage-reducing constant-current circuit; the junction point of the second capacitor C2 and the second inductor L2 is connected with the cathode of a second diode D2, and the anode of the second diode D2 is connected with the cathode of the step-down constant current circuit;
the input end of a third power switch S3 is connected between the second power switch S2 and a second capacitor C2, the output end of the third power switch S3 is connected with a third inductor L3, the other end of the third inductor L3 is connected with the anode of a third group of LED light sources, the cathode of the third group of LEDs is connected with the cathode of a buck constant current circuit, the output end of the third power switch S3 and the junction of the third inductor L3 are connected with the cathode of a third diode D3, and the anode of a third diode D3 is connected with the cathode of the buck constant current circuit;
in the same way, the input end of the nth power switch Sn is connected between the nth-1 power switch Sn-1 and the nth-1 capacitor Cn-1, the output end of the nth power switch Sn is connected with the nth inductor Ln, the other end of the nth inductor Ln is connected with the anode of the nth group of LED light sources, the cathode of the nth group of LED light sources is connected with the cathode of the power supply, the output end of the nth power switch Sn and the node of the nth inductor Ln are connected with the cathode of the nth diode Dn, and the anode of the nth diode Dn is connected with the cathode of the step-down constant current circuit.
The grid electrodes of the power switches are respectively connected with the controllers.
n is the number of output paths, only positive integers can be taken, and since the duty ratio is limited by 1/n, n is usually less than or equal to 10 (the duty ratio is more than 0.1). The value range of the comprehensive n is set to be more than or equal to 1 and less than or equal to 10.
Compared with the prior art, the invention has the following beneficial effects:
1. each path of constant current driving circuit drives one group of LED lamp groups, so that the problem of poor reliability caused by too many LED lamps connected in series is avoided; only one path is required to be controlled to realize constant current output, and the other paths can automatically realize constant current output, so that the control is simple; the circuit of the invention has simple structure, good output performance, low cost and small volume.
2. Compared with the existing circuit that AC input is rectified by PFC and a multistage voltage reduction or high-frequency transformer is adopted at the later stage, the invention has simple control and low cost; compared with the voltage reduction by a power frequency transformer and the post-stage constant current drive, the invention has small volume and good output performance.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the present invention;
fig. 3 is a waveform diagram of the output current of the circuit of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the commercial power high-power LED driving power supply according to the present invention includes two parts, the first part is a PFC rectifying link input connected to one side of the commercial power; the second part is a DC/DC voltage reduction constant current link. The output end of the voltage reduction constant current link is connected with the two ends of the LED luminous source. The improvement link of the invention is a voltage reduction constant current link of the second part. The link is composed of a novel converter with high voltage reduction ratio and multi-path constant current output capacity. The input end of the converter is connected with high-voltage 400V direct current passing through a PFC rectification link, and a plurality of paths of constant driving currents are output (taking 3 paths of output as an example). Each drive current drives a set of LED lighting fixtures. This avoids the problem of poor reliability due to excessive LED lamp series connections.
Example 1: as shown in fig. 1, a multi-path constant-current high-power LED driving power supply is composed of a PFC rectifier circuit and a DC/DC step-down constant-current circuit; the voltage reduction constant-current circuit consists of 3 paths of constant-current output converters with high voltage reduction ratio; the input end of the converter is connected with direct current passing through a PFC (power factor correction) rectification circuit and outputs a plurality of paths of constant driving current; each path of driving current drives a group of LED lighting lamps; the voltage-reducing constant-current circuit comprises 3 power switches S1, S2 and S3, 3 diodes D1, D2 and D3, 3 inductors L1, L2 and L3, and 2 capacitors C1 and C2;
the input end of the first power switch S1 is connected with the anode of the input direct current power supply, the output end is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is connected with a first inductor L1, the first inductor L1 is connected with the anode of a first group of LED light sources, and the cathode of the first group of LED light sources is connected with the cathode of the voltage-reducing constant current circuit; a first diode D1 is connected between the junction point of the first capacitor C1 and the first inductor L1 and the negative electrode of the voltage-reducing constant-current circuit, the anode of the first diode D1 is connected with the negative electrode of the voltage-reducing constant-current circuit, and the cathode of the first diode D1 is connected with the junction point;
the junction point of the first power switch S1 and the first capacitor C1 is connected with the input end of a second power switch S2, the output end of the second power switch S2 is connected with a second capacitor C2, a second inductor L2 is connected behind the second capacitor C2, the other end of the second inductor L2 is connected with the anode of a second group of LED light sources, and the cathode of the second group of LEDs is connected with the cathode of the voltage-reducing constant-current circuit; the junction point of the second capacitor C2 and the second inductor L2 is connected with the cathode of a second diode D2, and the anode of the second diode D2 is connected with the cathode of the step-down constant current circuit;
the input end of a third power switch S3 is connected between the second power switch S2 and the second capacitor C2, the output end of the third power switch S3 is connected with a third inductor L3, the other end of the third inductor L3 is connected with the anode of a third group of LED light sources, the cathode of the third group of LEDs is connected with the cathode of the buck constant current circuit, the output end of the third power switch S3 and the junction of the third inductor L3 are connected with the cathode of a third diode D3, and the anode of a third diode D3 is connected with the cathode of the buck constant current circuit.
According to the different states of the switch, the circuit can be divided into 4 working states:
(1) the controller controls the first power switch S1 to be turned on, and at this time, the 400V dc power provided by the PFC rectifier circuit charges the first capacitor C1 and the first inductor L1 through the first power switch S1, and simultaneously supplies power to the first group of LED lamp groups; at this time, the second power switch S2 and the third power switch S3 are both turned off, and the second inductor L2 and the third inductor L3 freewheel through the second diode D2 and the third diode D3 to supply power to the second group of LED lamps and the third group of LED lamps.
(2) The controller controls the second power switch S2 to be turned on, and at this time, the capacitor C1 charges the second capacitor C2 and the second inductor L2 through the power switch S2, and simultaneously supplies power to the second group of LED lamp groups; meanwhile, both the first power switch S1 and the third power switch S3 are turned off, and the first inductor L1 and the third inductor L3 freewheel through the first diode D1 and the third diode D3 to supply power to the first group of LED lamps and the third group of LED lamps.
(3) The controller controls the third power switch S3 to be turned on, and at this time, the capacitor C2 charges the third inductor L3 through the power switch S3 and supplies power to the third group of LED lamp groups; meanwhile, both the first power switch S1 and the second power switch S2 are turned off, and the first inductor L1 and the second inductor L2 freewheel through the first diode D1 and the second diode D2 to supply power to the first group of LED lamps and the second group of LED lamps.
(4) The power switches are all turned off, and the inductors L1, L2 and L3 freewheel through the corresponding diodes D1, D2 and D3, and simultaneously supply power to the LED lamps in the respective loops.
In an embodiment of the present invention, the power switch selects IRF440 and the diode selects BYT 56J.
The power switch used by the invention is a switch device, the opening and closing of the power switch are controlled by the controller, the three-way constant current driving circuit controls the duty ratio of the three-phase power switch to be the same by the controller, and the phase difference between each phase is 120 degrees. The capacitor and the inductor are energy storage elements which form a low-pass filter, energy can be transmitted out in a discrete form, and the inductor also plays a role of follow current when the power switch is switched off to supply power to the corresponding LED lamp group. Each path of constant current driving circuit drives one group of LED lamp groups, so that the problem of poor reliability caused by too many LED lamps connected in series is avoided.
In sum, when the LED lamp is used, only one path of LED lamp group needs to be detected and controlled, constant-current light emission of each path of LED lamp group can be realized, and the control is simple.
Example 2: as shown in fig. 2, the circuit is also powered by a dc power supply, the connection relationship of the step-down constant current circuit is the same as that in embodiment 1, however, in order to prevent the three-phase output circuit from outputting overcurrent and damaging the LED lamp set, the three-way comparator LM339 respectively compares the set safe current with the magnitude of each collected current, if the sampled current exceeds the safe current, the comparator outputs a high level to the control and protection circuit, and the control and protection circuit outputs a control signal to control the on and off of the corresponding power switch, thereby preventing the LED lamp set from being damaged due to the overcurrent.
Fig. 3 shows an output current waveform diagram of the present invention, which realizes three functions of voltage reduction, constant current and three-way output only by a first-stage converter, and has advantages in volume, cost, output waveform quality and reliability compared with the conventional commercial power LED driving.
In practical application, the number of the constant current driving circuits can be increased according to the lighting power requirement, and only the controller needs to control the power switches to have the same duty ratio and the phase difference between each phase to be 360 °/n.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (4)
1. A multi-path constant-current high-power LED driving power supply is characterized in that only one path is controlled to realize constant-current output, the other paths can automatically realize constant current, and each path of driving current drives a group of LED light sources;
the multi-path constant-current high-power LED driving power supply comprises n power switches S1, S2 and S3 … Sn, n diodes D1, D2 and D3 … Dn, n inductors L1, L2 and L3 … Ln, and n-1 capacitors C1 and C2 … Cn-1; wherein,
the input end of the first power switch S1 is connected with the anode of the input direct current power supply, the output end is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is connected with a first inductor L1, the first inductor L1 is connected with the anode of a first group of LED light sources, and the cathode of the first group of LED light sources is connected with the cathode of the voltage-reducing constant current circuit; a first diode D1 is connected between the junction point of the first capacitor C1 and the first inductor L1 and the negative electrode of the voltage-reducing constant-current circuit, the anode of the first diode D1 is connected with the negative electrode of the voltage-reducing constant-current circuit, and the cathode of the first diode D1 is connected with the junction point;
the junction point of the first power switch S1 and the first capacitor C1 is connected with the input end of a second power switch S2, the output end of the second power switch S2 is connected with a second capacitor C2, a second inductor L2 is connected behind the second capacitor C2, the other end of the second inductor L2 is connected with the anode of a second group of LED light sources, and the cathode of the second group of LEDs is connected with the cathode of the voltage-reducing constant-current circuit; the junction point of the second capacitor C2 and the second inductor L2 is connected with the cathode of a second diode D2, and the anode of the second diode D2 is connected with the cathode of the step-down constant current circuit;
the input end of a third power switch S3 is connected between the second power switch S2 and a second capacitor C2, the output end of the third power switch S3 is connected with a third inductor L3, the other end of the third inductor L3 is connected with the anode of a third group of LED light sources, the cathode of the third group of LEDs is connected with the cathode of a buck constant current circuit, the output end of the third power switch S3 and the junction of the third inductor L3 are connected with the cathode of a third diode D3, and the anode of a third diode D3 is connected with the cathode of the buck constant current circuit;
in the same way, the input end of an nth power switch Sn is connected between an nth-1 power switch Sn-1 and an nth-1 capacitor Cn-1, the output end of the nth power switch Sn is connected with an nth inductor Ln, the other end of the nth inductor Ln is connected with the anode of an nth group of LED light sources, the cathode of the nth group of LED light sources is connected with the cathode of a power supply, the output end of the nth power switch Sn and the node of the nth inductor Ln are connected with the cathode of an nth diode Dn, and the anode of the nth diode Dn is connected with the cathode of a voltage reduction constant current circuit;
the grid electrodes of the power switches are respectively connected with respective controllers, and the controllers control the conduction or the closing of the n power tubes S1, S2 and S3 … Sn, so that the multi-path constant-current high-power LED driving power supply works in the following n +1 working states: (1) the controller controls the first power switch S1 to be turned on, and at this time, the 400V dc power provided by the PFC rectifier circuit charges the first capacitor C1 and the first inductor L1 through the first power switch S1, and simultaneously supplies power to the first group of LED lamp groups; at this time, the second power switch S2 and the third power switch S3 are both turned off, and the second inductor L2 and the third inductor L3 freewheel through the second diode D2 and the third diode D3 to supply power to the second group of LED lamps and the third group of LED lamps; (2) the controller controls the second power switch S2 to be turned on, and at this time, the capacitor C1 charges the second capacitor C2 and the second inductor L2 through the power switch S2, and simultaneously supplies power to the second group of LED lamp groups; meanwhile, the first power switch S1 and the third power switch S3 are both turned off, and the first inductor L1 and the third inductor L3 freewheel through the first diode D1 and the third diode D3 to supply power to the first group of LED lamps and the third group of LED lamps; (3) the controller controls the third power switch S3 to be turned on, and at this time, the capacitor C2 charges the third inductor L3 through the power switch S3 and supplies power to the third group of LED lamp groups; meanwhile, both the first power switch S1 and the second power switch S2 are turned off, and the first inductor L1 and the second inductor L2 freewheel through the first diode D1 and the second diode D2 to supply power to the first group of LED lamps and the second group of LED lamps; (4) the power switches are all turned off, the inductors L1, L2 and L3 follow currents through the corresponding diodes D1, D2 and D3, and meanwhile power is supplied to the LED lamps of the loops;
wherein, n is the number of output paths, and can only take positive number, and the value range of n is: n is more than or equal to 2 and less than or equal to 10.
2. The multi-path constant-current high-power LED driving power supply according to claim 1, characterized in that: the drive signals of all power switches have the same duty cycle and are sequentially out of phase by 360/n.
3. The multi-path constant-current high-power LED driving power supply according to claim 1, characterized in that: all power switches select either MOSFETs or IGBTs, and the diodes may be replaced with fully-controlled switching devices as described above.
4. The multi-path constant-current high-power LED driving power supply according to claim 1, characterized in that: the input direct current power supply connected to the input end of the first power switch S1 is a direct current power supply obtained by passing mains supply through a PFC rectifier circuit.
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| CN102612235B (en) * | 2012-04-07 | 2014-03-12 | 李桂宏 | Light-emitting diode (LED) illuminating device comprising multistage constant current drive circuit |
| CN103179757B (en) * | 2013-03-25 | 2015-07-08 | 浙江海振电子科技有限公司 | Time-sharing multi-path constant current driving light emitting diode (LED) lamp |
| CN104219854B (en) * | 2014-09-26 | 2016-06-15 | 三峡大学 | A kind of multiple-channel output height blood pressure lowering LED constant current drives power supply |
| CN107197561B (en) * | 2017-06-12 | 2019-05-24 | 宜昌格志科技有限公司 | A kind of LED energy saving light modulator based on DC bus-bar voltage signal |
| CN115643654A (en) * | 2022-11-04 | 2023-01-24 | 唐山曹妃甸联城科技股份有限公司 | Wisdom street lamp control system |
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| TW200822800A (en) * | 2006-11-06 | 2008-05-16 | Ite Tech Inc | Light emitting diode driver and display using the same |
| CN101861019A (en) * | 2010-05-18 | 2010-10-13 | 重庆大学 | Driving power sources for lighting high-power LED array |
| CN201608944U (en) * | 2010-02-05 | 2010-10-13 | 企达工业(南京)有限公司 | Switch power supply without electrolytic capacitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW200822800A (en) * | 2006-11-06 | 2008-05-16 | Ite Tech Inc | Light emitting diode driver and display using the same |
| CN201608944U (en) * | 2010-02-05 | 2010-10-13 | 企达工业(南京)有限公司 | Switch power supply without electrolytic capacitor |
| CN101861019A (en) * | 2010-05-18 | 2010-10-13 | 重庆大学 | Driving power sources for lighting high-power LED array |
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