CN109982471B - LED lamp power supply, power supply control method and LED lamp - Google Patents
LED lamp power supply, power supply control method and LED lamp Download PDFInfo
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- CN109982471B CN109982471B CN201711447990.3A CN201711447990A CN109982471B CN 109982471 B CN109982471 B CN 109982471B CN 201711447990 A CN201711447990 A CN 201711447990A CN 109982471 B CN109982471 B CN 109982471B
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- 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]
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Abstract
The invention belongs to the technical field of LED power supplies, and provides an LED lamp power supply, a power supply control method and an LED lamp. The power supply for the LED lamp comprises a power supply body, wherein the power supply body comprises a first port, a second port and a third port; the power supply comprises a power supply body, a first LED array and a second LED array, wherein the first LED array and the second LED array are respectively arranged among ports of the power supply body, a third port is connected with the ground, the power supply body samples the first LED array through the first port and the second port to obtain a first sampling signal, and an error signal is obtained by comparing the first sampling signal with a reference voltage signal which is set in advance; the power supply body adjusts the voltage between the ports according to the error signal; the invention effectively solves the problems that the LED lamp power supply in the prior art can not be uniformly applied to LED lamps with different working voltages under the condition of not loading a current-limiting resistor and the application efficiency of the power supply is reduced after loading the current-limiting resistor.
Description
Technical Field
The invention belongs to the technical field of LED power supplies, and particularly relates to a power supply for an LED lamp, a power supply control method and an LED lamp.
Background
Because of its advantages of energy saving, long life, environmental protection, no stroboflash, safe and reliable low-voltage operation, shock resistance and impact resistance, the LED (Light Emitting Diode) lamp is currently used in various industrial fields; when the LED lamp works, constant voltage or constant current needs to be loaded on the LED lamp, in the prior art, the power supply of the LED lamp mainly ensures the voltage stability at two ends of the LED lamp through a constant voltage mode output mode and a current-limiting resistor, or ensures the stability of running current on the LED lamp through a mode of serially connecting a plurality of LEDs.
Therefore, the prior art has at least the following problems: if the constant voltage mode is adopted to drive the LED lamps to work, the rated voltages of different types of LED lamps are different, and when the current limiting resistor is adopted to keep the voltages at the two ends of the LED lamps constant, the current limiting resistor can cause larger electric energy loss, so that the output efficiency of the power supply is reduced; if the load end is not loaded with the current-limiting resistor, the power supply can not be uniformly applied to the LED lamps with different working voltages, and the flexibility is reduced, so that the problems that the constant power supply output by the LED lamp power supply in the prior art can not be universally applied and the application flexibility is low are solved.
Disclosure of Invention
The invention provides an LED lamp power supply, a power supply control method and an LED lamp, and aims to solve the problems that in the prior art, constant power supply power provided by an LED lamp power supply cannot be universally applicable and is low in application flexibility.
The invention provides a power supply for an LED lamp, which comprises a power supply body, wherein the power supply body comprises a first port, a second port and a third port, wherein:
the LED lamp comprises a first port, a second port, a third port and a fourth port, wherein the first port is used for being connected with the second port, the second port is used for being connected with the third port, the third port is connected with the ground, the first LED array comprises N LED lamp beads connected in series, the second LED array comprises M first LED arrays connected in parallel, and N and M are positive integers larger than or equal to 1;
the power supply body samples the first LED array through the first port and the second port to obtain a first sampling signal, and compares the first sampling signal with a reference voltage signal to obtain an error signal;
the power supply body adjusts a voltage between the first port and the second port and a voltage between the first port and the third port according to the error signal.
Further, the power supply body comprises a voltage control loop, a resistor, a first operational amplifier and a second operational amplifier;
the voltage control loop is configured to adjust a voltage between the first port and the second port and a voltage between the first port and the third port according to the error signal, a first end of the voltage control loop is the first port, the resistor is connected between the second port and the third port, a homodromous input end of the first operational amplifier is configured to be connected to the second port, an inverting input end of the first operational amplifier is configured to be connected to the third port, an output end of the first operational amplifier is connected to a homodromous input end of the second operational amplifier, an inverting input end of the second operational amplifier is connected to the reference voltage signal, and an output end of the second operational amplifier is connected to the second end of the voltage control loop.
The invention provides a control method of an LED lamp power supply, which comprises the above LED lamp power supply; the control method of the power supply of the LED lamp specifically comprises the following steps:
sampling the first LED array through the first port and the second port to obtain a first sampling signal;
the power supply body generates an error signal according to the first sampling signal and the reference voltage signal;
the power supply body adjusts a voltage between the first port and the second port and a voltage between the first port and the third port according to the error signal.
The invention provides an LED lamp, which comprises a first LED array with N LED lamp beads connected in series and a second LED array with M first LED arrays connected in parallel, wherein N and M are positive integers greater than or equal to 1, and the LED lamp further comprises the LED lamp power supply.
Compared with the prior art, the invention has the following beneficial technical effects: in the power supply of the LED lamp; sampling the first LED array through the first port and the second port to obtain a first sampling signal, setting a reference voltage signal which best meets the rated working condition of the first LED array in advance according to the first LED array, and comparing the first sampling signal with the reference voltage signal to obtain an error signal by the power supply body, so that the power supply body adjusts the voltage between the first port and the second port and the voltage between the first port and the third port according to the error signal to ensure that the first LED array and the second LED array are in stable and safe working states; when the number of the LED lamps in the LED array is reduced or increased, the LED power supply can sample the first LED array in real time through the first port and the second port, so that the voltage between the first port and the second port and the voltage between the first port and the third port can be kept in a constant state, and the LED power supply is high in flexibility and high in practicability; the problems that in the prior art, the LED lamp power supply cannot be uniformly applied to LED lamps with different working voltages under the condition that a load end is not loaded with a current-limiting resistor, and the power supply has low application efficiency and low application flexibility due to the electric energy loss caused by the heating of the resistor after the current-limiting resistor is loaded are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit structure diagram of a power supply for an LED lamp according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an implementation of a method for controlling a power supply of an LED lamp according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an LED lamp provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a circuit structure diagram of a power supply for an LED lamp according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
as shown in fig. 1, the power supply for LED lamp includes: a first port V +, a second port V1-, and a third port V2-; the LED lamp comprises a first port V + and a second port V1-and is used for being connected with first LED arrays 1-N, a first port V2-and is used for being connected with second LED arrays 1-M, and a third port V2-is connected with ground GND, wherein the first LED arrays 1-N comprise N LED lamp beads connected in series, the second LED arrays 1-M comprise M first LED arrays 1-N connected in parallel, and N and M are positive integers larger than or equal to 1.
Specifically, the power supply body PSU samples the first LED arrays 1-N through the first port V + and the second port V1-to obtain a first sampling signal, and the first sampling signal and the reference voltage signal V are used for samplingREFThe comparison is performed to obtain an error signal.
It should be noted that, when the first LED array includes N LED lamps connected in series, where the number of the LED lamps and performance parameters such as specifications can be changed arbitrarily according to actual needs, the power supply main unit PSU samples the operating current in the first LED arrays 1 to N through the first port V + and the second port V1 — to obtain a first sampling signal, where the first sampling signal is used to detect actual operating states of the LED lamps in the first LED arrays 1 to N.
In particular, the reference voltage signal VREFThe reference voltage signal V which best meets the rated working condition can be set in advance according to the performance parameters (such as at least one of rated power, resistance and rated voltage) of the first LED arrays 1-N according to the advance setting of the first LED arrays 1-N when the first LED arrays 1-N comprise LED lamps with different specificationsREF(ii) a The power supply body PSU is used for generating a first sampling signal and a reference voltage signal V according to the first sampling signalREFAnd comparing to obtain an error signal, wherein the error signal is used for detecting the voltage fluctuation conditions at two ends of the first LED arrays 1-N.
Specifically, the power supply body PSU adjusts the voltage between the first port V + and the second port V1-and the voltage between the first port V + and the third port V2-according to the error signal, so that the voltages at the two ends of the first LED array 1-N and the two ends of the second LED array 1-M are kept stable, and normal and stable operation of the LED lamp is ensured.
By the embodiment of the invention, when the first sampling signal and the reference voltage signal VREFWhen the comparison is carried out to obtain an error signal, the power supply body PSU keeps the voltages at the two ends of the first LED arrays 1-N and the second LED arrays 1-M constant according to the error signal, so that the LED lamps are in the optimal working state consistently, an external current limiting resistor is not required at the load end of the power supply of the LED lamps, and the number of the LED lamps in the LED arrays can be adjustedThe power supply is increased or decreased at will, so that the electric energy loss output by the power supply for the LED lamp is reduced, and the power supply for the LED lamp can be applied to the LED lamps with different working voltage ranges and has high flexibility; therefore, the problems that the LED lamp power supply cannot be uniformly applied to LED lamps with different working voltages without loading a current-limiting resistor at a load end or the LED lamp power supply is low in application efficiency and flexibility after loading the current-limiting resistor in the prior art are effectively solved.
Specifically, the power supply main unit PSU includes a voltage control loop 101, a resistor 102, a first operational amplifier OP1 and a second operational amplifier OP 2.
Specifically, the voltage control loop 101 adjusts the voltage between the first port V + and the second port V1-and the voltage between the first port V + and the third port V2-according to the error signal, the first end of the voltage control loop 101 is the first port V +, the resistor 102 is connected between the second port V1-and the third port V2-, the homodromous input end of the first operational amplifier OP1 is used for being connected with the second port V1-, and the inverting input end of the first operational amplifier OP1 is used for being connected with the third port V2-; optionally, the equidirectional input terminal and the inverting input terminal of the first operational amplifier OP1 are directly connected to the resistor 102, or the equidirectional input terminal and the inverting input terminal of the first operational amplifier OP1 are connected to the resistor 102 through an external proportional amplifying resistor, the output terminal of the first operational amplifier OP1 is connected to the equidirectional input terminal of the second operational amplifier OP2, and the inverting input terminal of the second operational amplifier OP2 is connected to the reference voltage signal VREFThe output terminal of the second operational amplifier OP2 is connected to the second terminal of the voltage control loop 101.
Specifically, the resistance of the resistor 102 is extremely small, so as to ensure that the potential of the second port V1-is approximately equal to the potential of the third port V2-, i.e., the voltage across the first LED array 1-N is approximately equal to the voltage across the second LED array 1-M, so that the voltage between the first port V + and the second port V1-and the voltage between the first port V + and the third port V2-have the same fluctuation.
Specifically, the first operator amplifier OP1 is used for detecting the variation of the operating current in the first LED arrays 1 to N; in the practical application process, whenWhen the operating current in the first LED arrays 1 to N changes, although the change value of the operating current is small, the current fluctuation is amplified by the first operational amplifier OP1 to generate a first sampling signal; when the first sampling signal is transmitted to the non-inverting input terminal of the second operational amplifier OP2, the inverting input terminal of the second operational amplifier OP2 receives the reference voltage signal VREFThe second operational amplifier OP2 is based on the first sampling signal and the reference voltage signal VREFObtaining an error signal, wherein the fluctuation condition of the voltage between the first port V + and the second port V1-can be measured through the error signal, and if the amplitude of the error signal is larger, the voltage fluctuation amplitude of the two ends of the first LED array 1-N is larger; further, the power supply main body PSU restores the voltages at the two ends of the first LED arrays 1 to N and the voltages at the two ends of the second LED arrays 1 to M to a stable state according to the error signal.
Specifically, the voltage control circuit 101 includes an MOS switch tube, a transformer, a diode, and the like, the voltage control circuit 101 is externally connected to an ac power supply, and by inputting a proper control signal to the MOS switch tube, the voltage control circuit 101 can output a constant voltage to the first port V + and the second port V1-and the first port V + and the third port V2-to provide a stable electric power for the LED lamp; optionally, the constant voltage output by the voltage control circuit 101 may be adjusted by adjusting the duty ratio of the control signal in the MOS switch tube, so as to ensure that the first LED arrays 1 to N and the second LED arrays 1 to M are in the optimal working state.
Specifically, fig. 2 shows an implementation flow of the method for controlling the power supply of the LED lamp according to the embodiment of the present invention, which includes the above-mentioned power supply of the LED lamp, and is detailed as follows:
step S201: the first LED arrays 1-N are sampled through the first port V + and the second port V1-to obtain a first sampling signal.
Step S202: the power supply body PSU is used for generating a first sampling signal and a reference voltage signal V according to the first sampling signalREFAn error signal is generated.
Step S203: the power supply body PSU adjusts the voltage between the first port V + and the second port V1-and the voltage between the first port V + and the third port V2-according to the error signal.
According to the embodiment of the invention, in the control method of the power supply of the LED lamp, the first LED arrays 1-N are sampled through the first port V + and the second port V1 to obtain the first sampling signal, so that the actual size of the running current in the first LED arrays 1-N can be obtained, and further the actual size of the running current in the first LED arrays 1-N can be obtained according to the first sampling signal and the reference voltage signal VREFGenerating an error signal, and enabling the first LED arrays 1-N and the second LED arrays 1-M to keep the optimal stable working state based on the error signal power supply body PSU, so that the industrial cost of the power supply of the LED lamp is reduced, and the application range is wider; therefore, the problems of overhigh industrial cost and low flexibility of the power supply of the LED lamp in the prior art are effectively solved.
Specifically, fig. 3 shows a schematic structural diagram of an LED lamp 30 provided in the embodiment of the present invention, where the LED lamp 30 includes first LED arrays 1 to N having N series-connected LED lamp beads and second LED arrays 1 to M having M parallel-connected first LED arrays 1 to N, where N and M are positive integers greater than or equal to 1, and the LED lamp 30 includes the above-described LED lamp power supply 301.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or structure that comprises a list of elements is inherently related to the elements. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The utility model provides a LED lamp power supply which characterized in that, includes the power body, the power body includes first port, second port and third port, wherein:
the LED lamp comprises a first port, a second port, a third port and a fourth port, wherein the first port is used for being connected with the second port, the second port is used for being connected with the third port, the third port is connected with the ground, the first LED array comprises N LED lamp beads connected in series, the second LED array comprises M first LED arrays connected in parallel, and N and M are positive integers larger than or equal to 1;
the power supply body samples the first LED array through the first port and the second port to obtain a first sampling signal, and compares the first sampling signal with a reference voltage signal to obtain an error signal;
the power supply body adjusts a voltage between the first port and the second port and a voltage between the first port and a third port according to the error signal;
the power supply body comprises a voltage control loop, a resistor, a first operational amplifier and a second operational amplifier; the voltage control loop is configured to adjust a voltage between the first port and the second port and a voltage between the first port and the third port according to the error signal, a first end of the voltage control loop is the first port, the resistor is connected between the second port and the third port, a homodromous input end of the first operational amplifier is configured to be connected to the second port, an inverting input end of the first operational amplifier is configured to be connected to the third port, an output end of the first operational amplifier is connected to a homodromous input end of the second operational amplifier, an inverting input end of the second operational amplifier is connected to the reference voltage signal, and an output end of the second operational amplifier is connected to the second end of the voltage control loop.
2. A method for controlling a power supply of an LED lamp, comprising the power supply of the LED lamp according to claim 1; the control method of the power supply of the LED lamp specifically comprises the following steps:
sampling the first LED array through the first port and the second port to obtain a first sampling signal;
the power supply body generates an error signal according to the first sampling signal and the reference voltage signal;
the power supply body adjusts a voltage between the first port and the second port and a voltage between the first port and the third port according to the error signal.
3. An LED lamp comprising a first LED array having N LED beads connected in series and a second LED array having M said first LED arrays connected in parallel, wherein N and M are positive integers greater than or equal to 1, and further comprising the LED lamp power supply of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711447990.3A CN109982471B (en) | 2017-12-27 | 2017-12-27 | LED lamp power supply, power supply control method and LED lamp |
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| CN201711447990.3A CN109982471B (en) | 2017-12-27 | 2017-12-27 | LED lamp power supply, power supply control method and LED lamp |
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| CN109982471A CN109982471A (en) | 2019-07-05 |
| CN109982471B true CN109982471B (en) | 2021-06-29 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120110996A (en) * | 2011-03-31 | 2012-10-10 | 한국전기연구원 | Control apparaus for power supply used for driving led |
| CN104254181A (en) * | 2014-09-18 | 2014-12-31 | 电子科技大学 | Multichannel LED array drive circuit |
| CN105657927A (en) * | 2014-11-14 | 2016-06-08 | 凹凸电子（武汉）有限公司 | Light source driving circuit and light source electric energy control circuit |
| CN106131996A (en) * | 2016-06-24 | 2016-11-16 | 成都芯源系统有限公司 | Light emitting diode driving system and driving method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201105172A (en) * | 2009-07-30 | 2011-02-01 | Advanced Connectek Inc | Light emitting diode (LED) device and driving method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120110996A (en) * | 2011-03-31 | 2012-10-10 | 한국전기연구원 | Control apparaus for power supply used for driving led |
| CN104254181A (en) * | 2014-09-18 | 2014-12-31 | 电子科技大学 | Multichannel LED array drive circuit |
| CN105657927A (en) * | 2014-11-14 | 2016-06-08 | 凹凸电子（武汉）有限公司 | Light source driving circuit and light source electric energy control circuit |
| CN106131996A (en) * | 2016-06-24 | 2016-11-16 | 成都芯源系统有限公司 | Light emitting diode driving system and driving method thereof |
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