CN114430596A - Current-sharing control system and method of LED power supply and multifunctional lamp pole - Google Patents
Current-sharing control system and method of LED power supply and multifunctional lamp pole Download PDFInfo
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Abstract
The invention relates to a current-sharing control system and method of an LED power supply and a multifunctional lamp post, which comprise a plurality of LED driving power supplies arranged in parallel, a plurality of output detection circuits arranged corresponding to the LED driving power supplies arranged in parallel, a plurality of output control circuits arranged corresponding to the LED driving power supplies arranged in parallel and a current-sharing control circuit; the current-sharing control circuit is respectively connected with the plurality of output detection circuits and the plurality of output control circuits; each output detection circuit is used for detecting the output signal of the LED driving power supply correspondingly arranged, and the current-sharing control circuit is used for judging the number of the LED driving power supplies of the parallel operation according to the output signal of each output detection circuit and carrying out current-sharing control on the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current. The current-sharing transient response circuit has the advantages of high current-sharing transient response speed, simple control structure, strong anti-interference capability, no communication requirement among a plurality of power supplies, lower requirement on a power supply and high reliability.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a current sharing control system and method of an LED power supply and a multifunctional lamp post.
Background
With the development and application of power electronic technology, the requirement of a power supply system on a high-power supply system is higher and higher, especially in outdoor high-power application occasions; in the practical application process, the output power and the reliability of a single power supply cannot meet the requirements, and once the single power supply fails, the power supply system is paralyzed and cannot run. The parallel operation of a plurality of power supplies can meet different output power requirements, the capacity of the power supplies can be flexibly expanded according to actual requirements, the redundancy of a power supply system is easy to realize, the output of the whole power supply system still has enough load capacity after a certain power supply is damaged, and the reliability of the power supply system is improved.
However, in general, a plurality of power supplies cannot be directly connected in parallel, and due to the inconsistent characteristics of the power supplies, some power supplies may bear larger current or even overload, and some power supplies work under light load or even no load, so that the reliability of a power supply system is reduced, and the service life is shortened.
In order to improve reliability, the power sharing condition of multiple power supplies needs to be considered, and a current sharing measure is generally adopted to improve the derating degree and reliability of the power supply. The traditional current sharing measure is applied to a power supply side, a plurality of power supplies are required to have current sharing communication interfaces with the same communication protocol, the requirement on the power supply is high, and a current sharing circuit applied to a load side needs to be researched.
Disclosure of Invention
The invention aims to solve the technical problem of providing a current-sharing control system and method of an LED power supply and a multifunctional lamp pole aiming at the existing defects.
The technical scheme adopted by the invention for solving the technical problems is as follows: a current sharing control system of an LED power supply is constructed, and comprises: a plurality of parallelly connected LED drive power supply, a plurality of regulating circuit and the control circuit that flow equalizes that sets up, a plurality of regulating circuit that flow equalizes includes: a plurality of output detection circuits provided corresponding to the plurality of LED driving power supplies provided in parallel and a plurality of output control circuits provided corresponding to the plurality of LED driving power supplies provided in parallel;
the current-sharing control circuit is respectively connected with the plurality of output detection circuits and the plurality of output control circuits;
each output detection circuit is used for detecting the output signal of the LED driving power supply correspondingly arranged with the output detection circuit, and the current-sharing control circuit is used for judging the number of the LED driving power supplies of the parallel operation according to the output signal of each output detection circuit and carrying out current-sharing control on the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current.
In the current-sharing control system of the LED power supply of the present invention, the current-sharing adjusting circuits further include: the dimming control circuits are arranged corresponding to the LED driving power supplies which are arranged in parallel, and each dimming control circuit is connected with the current-sharing control circuit;
each dimming line control circuit is used for adjusting the LED driving power supply correspondingly arranged according to the dimming signal output by the current-sharing control circuit.
In the current sharing control system of the LED power supply of the present invention, further comprising: the upper computer is connected with the current-sharing control circuit;
and the upper computer is used for sending the set total current to the current-sharing control circuit.
In the current sharing control system of the LED power supply of the present invention, the current sharing control circuit includes: a current-sharing control chip;
the current-sharing control chip comprises a plurality of dimming output pins, a plurality of driving output pins and a plurality of detection input pins;
the plurality of dimming output pins are respectively connected with dimming input ends of the plurality of dimming line control circuits, the plurality of driving output pins are respectively connected with driving input ends of the plurality of output control circuits, and the plurality of detection input pins are respectively connected with detection output ends of the plurality of output detection circuits.
In the current sharing control system of the LED power supply of the present invention, each of the dimming line control circuits includes: the dimming circuit comprises a power supply module, a fourth diode, a dimming chip, a ninth resistor, a tenth resistor, an input part of a second photoelectric coupler and an input part of a third photoelectric coupler;
the first end of the power supply module is connected with the anode of the fourth diode, the second end of the power supply module is grounded, and the cathode of the fourth diode is connected with the second power supply circuit;
the first end of the dimming chip is connected with the positive dimming output pin of the current-sharing control chip through the ninth resistor, the second end of the dimming chip is connected with the negative dimming output pin of the current-sharing control chip through the tenth resistor, the third end of the dimming chip is grounded through the input part of the second photoelectric coupler, and the fourth end of the dimming chip is grounded through the input part of the third photoelectric coupler.
In the current sharing control system of the LED power supply of the present invention, the second power supply circuit includes: a ninth triode, a fortieth resistor, a third capacitor and a second voltage regulator tube;
a collector of the ninth triode is connected with a cathode of the fourth diode, and an emitter of the ninth triode is respectively connected with the second power supply input end of each output detection circuit and the second power supply input end of each output control circuit;
the forty-th resistor is connected between the collector and the base of the ninth triode, the base of the ninth triode is connected with the cathode of the second voltage-regulator tube, and the anode of the second voltage-regulator tube is grounded; the third capacitor is connected between the emitter of the ninth triode and the ground.
In the current sharing control system of the LED power supply of the present invention, each of the output detection circuits includes: a fifteenth resistor, a sixteenth resistor, a fourth photocoupler;
a first end of the fifteenth resistor is connected to a positive output end of the LED driving power supply, a second end of the fifteenth resistor is connected to a negative output end of the LED driving power supply through an input portion of the fourth photoelectric coupler, a first end of the sixteenth resistor is connected to an emitter of the ninth triode, a second end of the sixteenth resistor is grounded through an output portion of the fourth photoelectric coupler, and a second end of the sixteenth resistor is further connected to a detection input pin of the current sharing control chip.
In the current sharing control system of the LED power supply of the present invention, each of the output control circuits includes: the twenty-first resistor, the twenty-second resistor, the seventh photoelectric coupler, the twenty-fourth resistor, the fifth capacitor, the sixth triode and the twenty-third capacitor;
a first end of the twenty-first resistor is connected with an output end of the first power supply circuit, and a second end of the twenty-first resistor is connected with an output control module of the LED driving power supply through an output part of the seventh photoelectric coupler;
a first end of the twenty-second resistor is connected with the second power supply circuit, a second end of the twenty-second resistor is connected with a collector of the sixth triode through an input part of the seventh photoelectric coupler, an emitter of the sixth triode is grounded, and a base of the sixth triode is connected with a driving output pin of the current-sharing control chip through the twenty-third resistor;
the twenty-fourth resistor is connected between the base electrode and the emitting electrode of the sixth triode, and the fifth capacitor is connected with the twenty-fourth resistor in parallel.
In the current sharing control system of the LED power supply of the present invention, the first power supply circuit includes: the eleventh resistor, the second triode, the first voltage regulator tube and the second capacitor;
a collector of the second triode is connected with the positive output end of the LED driving power supply, an emitter of the second triode is connected with the first end of the twenty-first resistor, a base of the second triode is connected with the cathode of the first voltage-regulator tube, and an anode of the first voltage-regulator tube is connected with the negative output end of the LED driving power supply;
the eleventh resistor is connected between the collector and the emitter of the second triode, the first end of the second capacitor is connected with the emitter of the second triode, and the second end of the second capacitor is connected with the anode of the first voltage-regulator tube.
The invention also provides a current sharing control method of the LED power supply, which comprises the following steps:
the current-sharing control circuit judges whether a set total current is received or not;
if yes, the current-sharing control circuit outputs a disconnection control signal to each output control circuit;
each output control circuit controls the output end of the LED driving power supply correspondingly arranged to be disconnected according to the disconnection control signal;
the current-sharing control circuit outputs current-sharing dimming signals to each dimming line control circuit;
each dimming line control circuit controls the LED driving power supply correspondingly arranged according to the current-equalizing dimming signal to perform dimming output;
each output detection circuit detects the output voltage of the LED driving power supply correspondingly arranged;
and the current-sharing control circuit performs current-sharing control according to the output signal of each output detection circuit.
In the current sharing control method of the LED power supply of the present invention, the current sharing control of the current sharing control circuit according to the output signal of each of the output detection circuits includes:
the current-sharing control circuit determines the number of LED driving power supplies of the parallel operation according to the output signal of each output detection circuit;
the current-sharing control circuit determines the output current of each LED driving power supply in the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current;
and the current-sharing control circuit carries out current-sharing control on the LED driving power supplies of the parallel operation according to the output current of each LED driving power supply.
In the current sharing control method of the LED power supply of the present invention, the method further includes:
and the upper computer issues the set total current to the current-sharing control circuit.
The invention also provides a multifunctional lamp post which adopts the current-sharing control system of the LED power supply to carry out current-sharing control.
The current-sharing control system and method for the LED power supply and the multifunctional lamp pole have the following beneficial effects that: the LED driving power supply comprises a plurality of LED driving power supplies arranged in parallel, a plurality of output detection circuits arranged corresponding to the LED driving power supplies arranged in parallel, a plurality of output control circuits arranged corresponding to the LED driving power supplies arranged in parallel and a current sharing control circuit; the current-sharing control circuit is respectively connected with the plurality of output detection circuits and the plurality of output control circuits; each output detection circuit is used for detecting the output signal of the LED driving power supply correspondingly arranged, and the current-sharing control circuit is used for judging the number of the LED driving power supplies of the parallel operation according to the output signal of each output detection circuit and carrying out current-sharing control on the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current. The current-sharing transient response circuit has the advantages of high current-sharing transient response speed, simple control structure, strong anti-interference capability, no communication requirement among a plurality of power supplies, lower requirement on a power supply and high reliability.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a current sharing control system of an LED power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a dimming line control circuit provided by the present invention;
FIG. 3 is a circuit diagram of an output detection circuit provided by the present invention;
FIG. 4 is a circuit diagram of an output control circuit provided by the present invention;
FIG. 5 is a circuit diagram of a current sharing control circuit provided by the present invention;
FIG. 6 is a circuit diagram of a first power supply circuit provided by the present invention;
FIG. 7 is a circuit diagram of a second power supply circuit provided by the present invention;
FIG. 8 is a circuit diagram of a first embodiment of the LED driving power supply provided by the present invention;
FIG. 9 is a circuit diagram of a second embodiment of an LED driving power supply provided by the present invention;
fig. 10 is a schematic flow chart of a current sharing control method for an LED power supply provided in the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of an alternative embodiment of a current sharing control system of an LED power supply provided in the present invention is shown.
As shown in fig. 1, the current sharing control system of the LED power supply includes: the LED driving circuit comprises a plurality of LED driving power supplies 10 (i.e. as shown in FIG. 1, respectively comprising a #1LED driving power supply, a #2LED driving power supply, … … and a # nLED driving power supply), a plurality of current-sharing adjusting circuits 20 (i.e. as shown in FIG. 1, respectively comprising a #1 dimming line control circuit, a #1 output detection circuit and a #1 output control circuit which are arranged corresponding to the #1LED driving power supply, a #2 dimming line control circuit, a #2 output detection circuit and a #2 output control circuit which are arranged corresponding to the #2LED driving power supply, a # n dimming line control circuit, a # n output detection circuit and a # n output control circuit which are arranged corresponding to the # nLED driving power supply), and a current-sharing control circuit 30.
The plurality of current sharing adjusting circuits 20 include: a plurality of output detection circuits provided corresponding to the plurality of LED driving power supplies 10 provided in parallel, and a plurality of output control circuits provided corresponding to the plurality of LED driving power supplies 10 provided in parallel.
The current-sharing control circuit 30 is connected to the plurality of output detection circuits and the plurality of output control circuits, respectively.
Each output detection circuit is used for detecting the output signal of the LED driving power supply corresponding to the output detection circuit, and the current-sharing control circuit 30 is used for judging the number of the parallel LED driving power supplies according to the output signal of each output detection circuit, and performing current-sharing control on the parallel LED driving power supplies according to the number of the parallel LED driving power supplies and the set total current.
Further, as shown in fig. 1, the plurality of current sharing adjusting circuits 20 further includes: and a plurality of dimming line control circuits provided corresponding to the plurality of LED driving power sources 10 provided in parallel, and each of the dimming line control circuits is connected to the current-sharing control circuit 30.
Each dimming line control circuit is used for adjusting the LED driving power supply correspondingly set according to the dimming signal output by the current-sharing control circuit 30.
Further, as shown in fig. 1, the current sharing control system of the LED power supply further includes: and the upper computer 40 is connected with the current-sharing control circuit 30.
The upper computer 40 is used for sending set total current to the current-sharing control circuit 30.
According to the LED parallel operation control method and device, the output voltage of each LED power supply is detected to judge the number of the LED driving power supplies of the current parallel operation, the output current of each LED driving power supply is calculated according to the set total current, so that the current sharing control is performed on each LED driving power supply of the current parallel operation based on the calculated output current, the output current of each LED driving power supply of the current parallel operation is balanced, the phenomena of overload, light load, no load and the like of the LED driving power supplies are avoided, and the reliability of the LED driving power supplies is improved.
Specifically, a specific example will be described below.
Fig. 2 to 7 are circuit diagrams of an embodiment of the present invention. In the embodiment of the present invention, only one of the dimming line control circuits has the same circuit structure, each output detection circuit has the same circuit structure, and each output control circuit has the same circuit structure, for example, the first LED driving power supply is taken as an example, where LED1+ represents a positive output terminal of the first LED driving power supply, and LED1 — represents a negative output terminal of the first LED driving power supply.
Specifically, as shown in fig. 5, in this embodiment, the current sharing control circuit 30 includes: and the current-sharing control chip.
The current-sharing control chip comprises a plurality of dimming output pins (DIM1+, DIM2+, … … and DIMN +), a plurality of driving output pins (DRV-1, DRV-2, … … and DRV-N), and a plurality of detection input pins (AD-VO1, AD-VO1, … … and AD-VON).
The dimming output pins are respectively connected with the dimming input ends of the dimming control circuits, the driving output pins are respectively connected with the driving input ends of the output control circuits, and the detection input pins are respectively connected with the detection output ends of the output detection circuits.
As shown in fig. 2, in this embodiment, each of the dimming line control circuits includes: the LED driving circuit comprises a power supply module, a fourth diode D4, a dimming chip DIM1 MCU, a ninth resistor R9, a tenth resistor R10, an input part OT2-A of a second photoelectric coupler and an input part OT3-A of a third photoelectric coupler.
It can be understood that, in the embodiment of the present invention, the dimming chip DIM1 MCU may be a single chip microcomputer, which can realize both the dimming function and the communication function, wherein each LED driving power supply 10 is provided with a dimming chip DIM i MCU.
The first end of the power supply module is connected with the anode of the fourth diode D4, the second end of the power supply module is grounded, and the cathode of the fourth diode D4 is connected with the second power supply circuit.
The first end of the dimming chip DIM1 MCU is connected with the positive dimming output pin of the current-sharing control chip through a ninth resistor R9, the second end of the dimming chip DIM1 MCU is connected with the negative dimming output pin of the current-sharing control chip through a tenth resistor R10, the third end of the dimming chip DIM1 MCU is grounded through an input part OT2-A of the second photoelectric coupler, and the fourth end of the dimming chip DIM1 MCU is grounded through an input part OT3-A of the third photoelectric coupler.
As shown in fig. 2, in this embodiment, the second power supply circuit includes: a ninth triode Q9, a fortieth resistor R40, a third capacitor C3 and a second regulator ZD 2.
The collector of the ninth transistor Q9 is connected to the cathode of the fourth diode D4, and the emitter of the ninth transistor Q9 is connected to the second power supply input terminal of each output detection circuit and the second power supply input terminal of each output control circuit, respectively.
A fortieth resistor R40 is connected between the collector and the base of the ninth triode Q9, the base of the ninth triode Q9 is connected with the cathode of a second voltage-regulator tube ZD2, and the anode of the second voltage-regulator tube ZD2 is grounded; the third capacitor C3 is connected between the emitter of the ninth transistor Q9 and ground.
As shown in fig. 2, in this embodiment, each of the output detection circuits includes: a fifteenth resistor R15, a sixteenth resistor R16 and a fourth photoelectric coupler.
The first end of the fifteenth resistor R15 is connected with the positive output end of the LED driving power supply, the second end of the fifteenth resistor R15 is connected with the negative output end of the LED driving power supply through the input part OT4-A of the fourth photoelectric coupler, the first end of the sixteenth resistor R16 is connected with the emitter of the ninth triode Q9, the second end of the sixteenth resistor R16 is grounded through the output part OT4-B of the fourth photoelectric coupler, and the second end of the sixteenth resistor R16 is also connected with the detection input pin of the current-sharing control chip.
As shown in fig. 2, in this embodiment, each of the output control circuits includes: the circuit comprises a twenty-first resistor R21, a twenty-second resistor R22, a seventh photoelectric coupler, a twenty-fourth resistor R24, a fifth capacitor C5, a sixth triode Q6 and a twenty-third capacitor C23.
The first end of the twenty-first resistor R21 is connected with the output end of the first power supply circuit, and the second end of the twenty-first resistor R21 is connected with the output control module of the LED driving power supply through the output part OT7-B of the seventh photoelectric coupler.
A first end of the twenty-second resistor R22 is connected with the second power supply circuit, a second end of the twenty-second resistor R22 is connected with a collector of the sixth triode Q6 through an input portion OT7-a of the seventh photocoupler, an emitter of the sixth triode Q6 is grounded, and a base of the sixth triode Q6 is connected with a driving output pin of the current-sharing control chip through a twenty-third resistor.
The twenty-fourth resistor R24 is connected between the base and the emitter of the sixth transistor Q6, and the fifth capacitor C5 is connected in parallel with the twenty-fourth resistor R24.
As shown in fig. 2, in this embodiment, the first power supply circuit includes: an eleventh resistor R11, a second triode Q2, a first voltage regulator ZD1 and a second capacitor C2.
The collector of the second triode Q2 is connected with the positive output end of the LED driving power supply, the emitter of the second triode Q2 is connected with the first end of the twenty-first resistor R21, the base of the second triode Q2 is connected with the cathode of the first voltage-regulator tube ZD1, and the anode of the first voltage-regulator tube ZD1 is connected with the negative output end of the LED driving power supply.
The eleventh resistor R11 is connected between the collector and the emitter of the second triode Q2, the first end of the second capacitor C2 is connected with the emitter of the second triode Q2, and the second end of the second capacitor C2 is connected with the anode of the first voltage regulator ZD 1.
Fig. 8 and 9 are circuit diagrams of a first embodiment and a second embodiment of an output control module of an LED driving power supply according to the present invention.
As shown in fig. 8, in this embodiment, the output control module includes: and a third MOS transistor Q3. The third MOS transistor Q3 is connected in series to the negative output line of the LED driving power supply, and the gate of the third MOS transistor Q3 is connected to the second end of the output portion OT7-B of the seventh photocoupler.
As shown in fig. 9, in this embodiment, the output control module includes: first relay RL 1. The first relay RL1 is connected in series with the positive output line of the LED driving power supply, and the control end of the first relay RL1 is connected with the second end of the output portion OT7-B of the seventh photoelectric coupler.
Referring to fig. 10, the current sharing control method for the LED power supply provided by the present invention can be implemented by the current sharing control system for the LED power supply disclosed in the embodiment of the present invention.
Specifically, as shown in fig. 10, the current sharing control method for the LED power supply includes the following steps:
in step S101, the current sharing control circuit 30 determines whether a set total current is received.
In step S102, if yes, the current sharing control circuit 30 outputs a disconnection control signal to each output control circuit.
And step S103, each output control circuit controls the output end of the LED driving power supply correspondingly arranged to the output control circuit to be disconnected according to the disconnection control signal.
In step S104, the current-sharing control circuit 30 outputs a current-sharing dimming signal to each dimming line control circuit.
And S105, each dimming line control circuit controls the LED driving power supply correspondingly arranged according to the current-sharing dimming signal to perform dimming output.
And S106, each output detection circuit detects the output voltage of the LED driving power supply correspondingly arranged.
In step S107, the current-sharing control circuit 30 performs current-sharing control according to the output signal of each output detection circuit.
In some embodiments, the current sharing control circuit 30 performing current sharing control according to the output signal of each output detection circuit includes: the current-sharing control circuit 30 determines the number of the parallel-operation LED driving power sources according to the output signal of each output detection circuit; the current-sharing control circuit 30 determines the output current of each LED driving power supply in the parallel LED driving power supplies according to the number of the parallel LED driving power supplies and the set total current; the current-sharing control circuit 30 performs current-sharing control on the parallel LED driving power supplies according to the output current of each LED driving power supply.
Further, the current sharing control method of the LED power supply further comprises the following steps: the upper computer 40 issues a set total current to the current-sharing control circuit 30.
Specifically, as shown in fig. 2 to 8, in this embodiment, when the upper computer issues the set total current to the current sharing control chip, the current sharing control chip sends the disconnection control signal to the first output control circuit, the second output control circuit, … …, and the nth output control circuit through DRV-1, DRV-2, … …, and DRV-N, respectively, the first output control circuit, the second output control circuit, … …, and the nth output control circuit control the output terminal of the first LED driving power supply, the output terminal of the second LED driving power supply, … …, and the output terminal of the nth LED driving power supply to be disconnected, and simultaneously sends the current sharing dimming signal to the first dimming control circuit, the second dimming control circuit, and the nth dimming control circuit through DIM1+, DIM1+, … …, and DIM control wires +, respectively, and the first dimming control circuit controls the current, and the second dimming control wires, and the nth dimming circuit, respectively, The second dimming line control circuit and the nth dimming line control circuit respectively control the first LED driving power supply, the second LED driving power supply, … … and the nth LED driving power supply to perform dimming output, and further respectively detect the output voltages of the first LED driving power supply, the second LED driving power supply, … … and the nth LED driving power supply through the first output detection circuit, the second output detection circuit, … … and the nth output detection circuit, and further judge whether the corresponding LED driving power supply is normal or not through the current-sharing control chip according to the output signal of each output detection circuit, so as to determine the number of the current LED driving power supplies of the parallel operation, and then calculate the output current of each LED driving power supply according to the set total current and the number of the current LED driving power supplies of the parallel operation.
For example, as shown in fig. 2 to 8, after the output current of each LED driving power supply is calculated, the current-sharing control chip is integrated into a linear reference voltage to the current feedback reference circuit of the first LED driving power supply through DIM1+/DIM1-, a ninth resistor R9 and a tenth resistor R10 to the dimming chip DIM1 MCU, and then integrated into the linear reference voltage through the second photocoupler (OT2-A, OT2-B), the eighth resistor R8 and the second capacitor C2, so as to control the first LED driving power supply to output the current-sharing current. Similarly, the current sharing control is performed on the second LED driving power supply, … … and the nth LED driving power supply in the same manner.
The invention can set the required total current according to the requirements of users, carry out current sharing control through the current sharing control chip, and simultaneously control each LED driving power supply to synchronously output, thereby avoiding the inconsistent startup time of each LED driving power supply during parallel operation.
In addition, the plurality of LED driving power supplies can meet different output power requirements when running in parallel, the capacity of the LED driving power supplies can be flexibly expanded according to actual requirements, the redundancy of a power supply system is easy to realize, the output of the whole power supply system still has enough load capacity after one LED driving power supply is damaged, and the reliability of the power supply system is improved.
In some embodiments, the invention further provides a multifunctional lamp post, and the multifunctional lamp post can perform current sharing control by using the current sharing control system of the LED power supply disclosed in the embodiments of the invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (13)
1. A current sharing control system of an LED power supply is characterized by comprising: a plurality of parallelly connected LED drive power supply, a plurality of regulating circuit and the control circuit that flow equalizes that sets up, a plurality of regulating circuit that flow equalizes includes: a plurality of output detection circuits provided corresponding to the plurality of LED driving power supplies provided in parallel and a plurality of output control circuits provided corresponding to the plurality of LED driving power supplies provided in parallel;
the current-sharing control circuit is respectively connected with the plurality of output detection circuits and the plurality of output control circuits;
each output detection circuit is used for detecting the output signal of the LED driving power supply correspondingly arranged with the output detection circuit, and the current-sharing control circuit is used for judging the number of the LED driving power supplies of the parallel operation according to the output signal of each output detection circuit and carrying out current-sharing control on the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current.
2. The current sharing control system for the LED power supply of claim 1, wherein the plurality of current sharing regulation circuits further comprises: the dimming control circuits are arranged corresponding to the LED driving power supplies which are arranged in parallel, and each dimming control circuit is connected with the current-sharing control circuit;
each dimming line control circuit is used for adjusting the LED driving power supply correspondingly arranged according to the dimming signal output by the current-sharing control circuit.
3. The current sharing control system for the LED power supply according to claim 1, further comprising: the upper computer is connected with the current-sharing control circuit;
and the upper computer is used for sending the set total current to the current-sharing control circuit.
4. The current sharing control system for the LED power supply according to claim 2, wherein the current sharing control circuit comprises: a current-sharing control chip;
the current-sharing control chip comprises a plurality of dimming output pins, a plurality of driving output pins and a plurality of detection input pins;
the plurality of dimming output pins are respectively connected with dimming input ends of the plurality of dimming line control circuits, the plurality of driving output pins are respectively connected with driving input ends of the plurality of output control circuits, and the plurality of detection input pins are respectively connected with detection output ends of the plurality of output detection circuits.
5. The current sharing control system for LED power supply of claim 4, wherein each of said dimming line control circuits comprises: the dimming circuit comprises a power supply module, a fourth diode, a dimming chip, a ninth resistor, a tenth resistor, an input part of a second photoelectric coupler and an input part of a third photoelectric coupler;
the first end of the power supply module is connected with the anode of the fourth diode, the second end of the power supply module is grounded, and the cathode of the fourth diode is connected with the second power supply circuit;
the first end of the dimming chip is connected with the positive dimming output pin of the current-sharing control chip through the ninth resistor, the second end of the dimming chip is connected with the negative dimming output pin of the current-sharing control chip through the tenth resistor, the third end of the dimming chip is grounded through the input part of the second photoelectric coupler, and the fourth end of the dimming chip is grounded through the input part of the third photoelectric coupler.
6. The current sharing control system for LED power supply of claim 5, wherein the second power supply circuit comprises: a ninth triode, a fortieth resistor, a third capacitor and a second voltage-regulator tube;
a collector of the ninth triode is connected with a cathode of the fourth diode, and an emitter of the ninth triode is respectively connected with the second power supply input end of each output detection circuit and the second power supply input end of each output control circuit;
the forty-th resistor is connected between the collector and the base of the ninth triode, the base of the ninth triode is connected with the cathode of the second voltage-regulator tube, and the anode of the second voltage-regulator tube is grounded; the third capacitor is connected between the emitter of the ninth triode and the ground.
7. The current sharing control system for LED power supply of claim 6, wherein each of said output detection circuits comprises: a fifteenth resistor, a sixteenth resistor, a fourth photocoupler;
a first end of the fifteenth resistor is connected to a positive output end of the LED driving power supply, a second end of the fifteenth resistor is connected to a negative output end of the LED driving power supply through an input portion of the fourth photoelectric coupler, a first end of the sixteenth resistor is connected to an emitter of the ninth triode, a second end of the sixteenth resistor is grounded through an output portion of the fourth photoelectric coupler, and a second end of the sixteenth resistor is further connected to a detection input pin of the current sharing control chip.
8. The current sharing control system for LED power supply of claim 5, wherein each of said output control circuits comprises: the twenty-first resistor, the twenty-second resistor, the seventh photoelectric coupler, the twenty-fourth resistor, the fifth capacitor, the sixth triode and the twenty-third capacitor;
a first end of the twenty-first resistor is connected with an output end of the first power supply circuit, and a second end of the twenty-first resistor is connected with an output control module of the LED driving power supply through an output part of the seventh photoelectric coupler;
a first end of the twenty-second resistor is connected with the second power supply circuit, a second end of the twenty-second resistor is connected with a collector of the sixth triode through an input part of the seventh photoelectric coupler, an emitter of the sixth triode is grounded, and a base of the sixth triode is connected with a driving output pin of the current-sharing control chip through the twenty-third resistor;
the twenty-fourth resistor is connected between the base electrode and the emitting electrode of the sixth triode, and the fifth capacitor is connected with the twenty-fourth resistor in parallel.
9. The current sharing control system for LED power supplies according to claim 8, wherein the first power supply circuit comprises: the eleventh resistor, the second triode, the first voltage regulator tube and the second capacitor;
a collector of the second triode is connected with the positive output end of the LED driving power supply, an emitter of the second triode is connected with the first end of the twenty-first resistor, a base of the second triode is connected with the cathode of the first voltage-regulator tube, and an anode of the first voltage-regulator tube is connected with the negative output end of the LED driving power supply;
the eleventh resistor is connected between the collector and the emitter of the second triode, the first end of the second capacitor is connected with the emitter of the second triode, and the second end of the second capacitor is connected with the anode of the first voltage-regulator tube.
10. A current sharing control method of an LED power supply is characterized by comprising the following steps:
the current-sharing control circuit judges whether a set total current is received or not;
if yes, the current-sharing control circuit outputs a disconnection control signal to each output control circuit;
each output control circuit controls the output end of the LED driving power supply correspondingly arranged to be disconnected according to the disconnection control signal;
the current-sharing control circuit outputs current-sharing dimming signals to each dimming line control circuit;
each dimming line control circuit controls the LED driving power supply correspondingly arranged according to the current-equalizing dimming signal to perform dimming output;
each output detection circuit detects the output voltage of the LED driving power supply correspondingly arranged;
and the current-sharing control circuit performs current-sharing control according to the output signal of each output detection circuit.
11. The method of claim 10, wherein the current sharing control of the current sharing control circuit according to the output signal of each output detection circuit comprises:
the current-sharing control circuit determines the number of LED driving power supplies of the parallel operation according to the output signal of each output detection circuit;
the current-sharing control circuit determines the output current of each LED driving power supply in the LED driving power supplies of the parallel operation according to the number of the LED driving power supplies of the parallel operation and the set total current;
and the current-sharing control circuit carries out current-sharing control on the LED driving power supplies of the parallel operation according to the output current of each LED driving power supply.
12. The method for current sharing control of the LED power supply according to claim 11, further comprising:
and the upper computer issues the set total current to the current-sharing control circuit.
13. A multifunctional lamp post, characterized in that the current sharing control system of the LED power supply of any one of claims 1 to 9 is adopted for current sharing control.
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| CN202111621432.0A CN114430596A (en) | 2021-12-23 | 2021-12-23 | Current-sharing control system and method of LED power supply and multifunctional lamp pole |
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