CN113905484A - Low-voltage LED lamp strip - Google Patents
Low-voltage LED lamp strip Download PDFInfo
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- CN113905484A CN113905484A CN202111186168.2A CN202111186168A CN113905484A CN 113905484 A CN113905484 A CN 113905484A CN 202111186168 A CN202111186168 A CN 202111186168A CN 113905484 A CN113905484 A CN 113905484A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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Abstract
The application provides a low pressure LED lamp area includes: the LED light source comprises a plurality of LEDs, a low-voltage alternating current power supply and a constant current module, wherein the LEDs are divided into four LED lamp strings; the front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with the first end of the low-voltage alternating-current power supply, the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with the second end of the low-voltage alternating-current power supply, the rear end of the first LED lamp string and the rear end of the second LED lamp string are respectively connected with the first public end, the front end of the third LED lamp string and the front end of the fourth LED lamp string are respectively connected with the second public end, the constant-current module is connected between the first public end and the second public end in parallel, the current flowing through each LED lamp string can be effectively controlled to be constant, the length of the lamp strip can be increased to 25 meters, the luminous fluxes of the front end and the rear end of each LED lamp string are consistent, the brightness is displayed uniformly, the uniformity of the illumination of an illuminated object can be improved, and the application range of the lamp strip can be expanded.
Description
Technical Field
The application relates to the technical field of low-voltage LED lamp belts, in particular to a low-voltage LED lamp belt.
Background
At present, the LED lamp strip is mostly driven by a constant voltage power supply, so that a current-limiting resistor and the like need to be connected in series on the lamp string to limit the magnitude of the current of the branch circuit, so as to prevent the current from being too large and burning out the series-connected components, thereby driving each string of LEDs.
However, the scheme of driving each string of LEDs by using a series current-limiting resistor can only achieve 5m, some of which are even shorter, without affecting optical parameters, which limits the wide application of the lamp strip. If the length of the lamp strip is lengthened, the voltage at the rear end of the lamp string is insufficient due to the resistance on the lamp strip circuit, so that the difference of luminous flux between the front end and the rear end of the lamp string is large, the brightness display is uneven, and the uniformity of the illumination of an illuminated object is seriously influenced.
Disclosure of Invention
In view of this, an object of the present application is to provide a low voltage LED strip, which can effectively control the current flowing through each string of LED strings to be constant, the length of the low voltage LED strip can be increased to 25 meters, the luminous fluxes of the front end and the rear end of each string of LED strings are consistent, the brightness display is uniform, the uniformity of the illumination of the illuminated object can be improved, and the application range of the low voltage LED strip is expanded.
The embodiment of the application provides a low pressure LED lamp area, include: the LED lamp comprises a plurality of LEDs, a low-voltage alternating-current power supply and a constant-current module, wherein the LEDs are divided into four LED lamp strings, and the constant-current module is used for controlling the current flowing through each LED lamp string to be constant, so that the luminous fluxes of the front end and the rear end of each LED lamp string are consistent;
the front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with the first end of the low-voltage alternating-current power supply, the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with the second end of the low-voltage alternating-current power supply, the rear end of the first LED lamp string and the rear end of the second LED lamp string are respectively connected with the first public end, the front end of the third LED lamp string and the front end of the fourth LED lamp string are respectively connected with the second public end, and the constant-current module is connected between the first public end and the second public end in parallel.
In a possible embodiment, the low voltage LED strip further comprises: the device comprises a first reverse module, a second reverse module, a third reverse module and a fourth reverse module; the first reverse module is used for protecting an LED at the rear end of the first LED lamp string from being broken down by reverse voltage, the second reverse module is used for protecting an LED at the rear end of the second LED lamp string from being broken down by reverse voltage, the third reverse module is used for protecting an LED at the rear end of the third LED lamp string from being broken down by reverse voltage, and the fourth reverse module is used for protecting an LED at the rear end of the fourth LED lamp string from being broken down by reverse voltage;
the first reverse module is further connected in series between the rear end of the first LED lamp string and the first public end, the second reverse module is further connected in series between the rear end of the second LED lamp string and the first public end, the third reverse module is further connected in series between the rear end of the third LED lamp string and the first end of the low-voltage alternating-current power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED lamp string and the second end of the low-voltage alternating-current power supply.
In one possible embodiment, the number and type of LEDs in each string of LED strings are the same.
In one possible embodiment, the constant current module comprises a constant current diode;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the anode of the constant current diode is connected with the first common end, and the cathode of the constant current diode is connected with the second common end.
In one possible embodiment, the constant current module includes a first triode, a second triode, a first resistor, a second resistor and a third resistor;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the base electrode of the first triode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor and the collector electrode of the second triode respectively, the emitter electrode of the first triode is connected with the first end of the third resistor and the base electrode of the second triode respectively, the collector electrode of the first triode and the second end of the second resistor are connected with the first public end respectively, and the second end of the third resistor and the emitter electrode of the second triode are connected with the second public end.
In one possible embodiment, the constant current module comprises a linear constant current chip and a fourth resistor;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the LED cathode input end of the linear constant current chip is connected with the first common end, the grounding end of the linear constant current chip is connected with the second common end, the first CS end and the second CS end of the linear constant current chip are both connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the second common end.
In one possible embodiment, the first reverse module comprises a first reverse diode, the second reverse module comprises a second reverse diode, the third reverse module comprises a third reverse diode, and the fourth reverse module comprises a fourth reverse diode;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the anode of the first reverse diode, and the cathode of the first reverse diode is connected with the first common end;
the rear end of the second LED lamp string is connected with the anode of the second reverse diode, and the cathode of the second reverse diode is connected with the first common end;
the rear end of the third LED lamp string is connected with the anode of the third reverse diode, and the cathode of the third reverse diode is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the anode of the fourth reverse diode, and the cathode of the fourth reverse diode is connected with the second end of the low-voltage alternating-current power supply.
In one possible embodiment, the first inversion module comprises a first field effect transistor, the second inversion module comprises a second field effect transistor, the third inversion module comprises a third field effect transistor, and the fourth inversion module comprises a fourth field effect transistor;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the source electrode of the first field effect transistor, the drain electrode of the first field effect transistor is connected with the first common end, and the grid electrode of the first field effect transistor is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the second LED lamp string is connected with the source electrode of the second field effect transistor, the drain electrode of the second field effect transistor is connected with the first common end, and the grid electrode of the second field effect transistor is connected with the second end of the low-voltage alternating-current power supply;
the rear end of the third LED lamp string is connected with the source electrode of the third field effect transistor, the grid electrode of the third field effect transistor is connected with the second common end, and the drain electrode of the third field effect transistor is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the source electrode of the fourth field effect transistor, the grid electrode of the fourth field effect transistor is connected with the second common end, and the drain electrode of the fourth field effect transistor is connected with the second end of the low-voltage alternating-current power supply.
In one possible embodiment, the first inversion module includes a first load switch, the second inversion module includes a second load switch, the third inversion module includes a third load switch, and the fourth inversion module includes a fourth load switch;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the voltage input end of the first load switch, and the voltage output end of the first load switch is connected with the first common end;
the rear end of the second LED lamp string is connected with the voltage input end of the second load switch, and the voltage output end of the second load switch is connected with the first common end;
the rear end of the third LED lamp string is connected with the voltage input end of the third load switch, and the voltage output end of the third load switch is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the voltage input end of the fourth load switch, and the voltage output end of the fourth load switch is connected with the second end of the low-voltage alternating-current power supply.
In a possible embodiment, the low voltage LED strip has a length of 25 meters.
The embodiment of the application provides a low pressure LED lamp area, include: the LED lamp comprises a plurality of LEDs, a low-voltage alternating current power supply and a constant current module, wherein the LEDs are divided into four LED lamp strings, and the constant current module is used for controlling the current flowing through each LED lamp string to be constant, so that the luminous fluxes of the front end and the rear end of each LED lamp string are consistent. The front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with the first end of the low-voltage alternating-current power supply, the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with the second end of the low-voltage alternating-current power supply, the rear end of the first LED lamp string and the rear end of the second LED lamp string are respectively connected with the first public end, the front end of the third LED lamp string and the front end of the fourth LED lamp string are respectively connected with the second public end, and the constant-current module is connected between the first public end and the second public end in parallel. The embodiment of the application utilizes the rectifier bridge principle, connects four strings of LED lamp strings, low-voltage alternating current power supply and constant current module according to the circuit structure similar to the rectifier bridge, can effectively control the current flowing through each string of LED lamp string to be constant, the length of the low-voltage LED lamp strip can be increased to 25 meters, the luminous flux of the front end and the rear end of each string of LED lamp string is consistent, the brightness display is uniform, the uniformity of the illumination intensity of an illuminated object can be improved, and the application range of the lamp strip is expanded.
Further, the low pressure LED lamp area that this application embodiment provided can also include: the device comprises a first reverse module, a second reverse module, a third reverse module and a fourth reverse module; the first reverse module is used for protecting an LED at the rear end of the first LED lamp string from being broken down by reverse voltage, the second reverse module is used for protecting an LED at the rear end of the second LED lamp string from being broken down by reverse voltage, the third reverse module is used for protecting an LED at the rear end of the third LED lamp string from being broken down by reverse voltage, and the fourth reverse module is used for protecting an LED at the rear end of the fourth LED lamp string from being broken down by reverse voltage; the first reverse module is further connected in series between the rear end of the first LED lamp string and the first public end, the second reverse module is further connected in series between the rear end of the second LED lamp string and the first public end, the third reverse module is further connected in series between the rear end of the third LED lamp string and the first end of the low-voltage alternating-current power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED lamp string and the second end of the low-voltage alternating-current power supply. According to the embodiment of the application, the reverse module is added on the basis of the low-voltage LED lamp strip, so that LEDs at the front end and/or the rear end of each string of LED lamp strings can be better protected from being broken down by reverse voltage.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a circuit diagram of a first low-voltage LED strip provided in an embodiment of the present application;
fig. 2 shows a circuit diagram of a second low-voltage LED strip provided in an embodiment of the present application;
fig. 3 shows a circuit diagram of a third low-voltage LED strip provided in an embodiment of the present application;
fig. 4 shows a circuit diagram of a fourth low-voltage LED strip provided by an embodiment of the present application;
fig. 5 shows a circuit diagram of a fifth low-voltage LED strip provided in the embodiments of the present application;
fig. 6 shows a circuit diagram of a sixth low-voltage LED strip provided in an embodiment of the present application;
fig. 7 shows a circuit diagram of a seventh low-voltage LED strip provided in the embodiment of the present application;
fig. 8 shows a circuit diagram of an eighth low-voltage LED strip provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Considering the traditional scheme of driving each string of LEDs by adopting a series current-limiting resistor, the lamp strip can only achieve 5m without influencing optical parameters, and some lamp strips are even shorter, so that the wide application of the lamp strip is limited. If the length of the lamp strip is lengthened, the voltage at the rear end of the lamp string is insufficient due to the resistance on the lamp strip circuit, so that the difference of luminous flux between the front end and the rear end of the lamp string is large, the brightness display is uneven, and the uniformity of the illumination of an illuminated object is seriously influenced. Based on this, this application embodiment provides a low pressure LED lamp area, describes through the embodiment below.
Example one
Referring to fig. 1, fig. 1 is a circuit diagram of a first low-voltage LED strip provided in an embodiment of the present application. As shown in fig. 1, the low voltage LED strip comprises: a plurality of LEDs, a low-voltage alternating current power supply (AC-), and a constant current module.
The LEDs are divided into four LED lamp strings, the first LED lamp string is positioned at the upper left part of the figure 1, the second LED lamp string is positioned at the upper right part of the figure 1, the third LED lamp string is positioned at the lower left part of the figure 1, and the fourth LED lamp string is positioned at the lower right part of the figure 1. The front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with a first end of the low-voltage alternating current power supply (AC-), and the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with a second end of the low-voltage alternating current power supply (AC-). Preferably, the number and type of LEDs in each string of LED strings are the same.
The constant current module is used for controlling the current flowing through each string of LED lamp strings to be constant, so that the luminous flux of the front end and the rear end of each string of LED lamp strings is consistent. The front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with a first end of a low-voltage alternating current power supply (AC-), the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with a second end of the low-voltage alternating current power supply (AC-), the rear end of the first LED lamp string and the rear end of the second LED lamp string are respectively connected with a first public end (a), the front end of the third LED lamp string and the front end of the fourth LED lamp string are respectively connected with a second public end (b), and the constant current module is connected between the first public end (a) and the second public end (b) in parallel. The first common terminal (a) and the second common terminal (b) are two circuit connection points set for the convenience of the analysis circuit.
The embodiment of the application utilizes the rectifier bridge principle, connects four strings of LED lamp strings, low-voltage alternating current power supply and constant current module according to the circuit structure similar to the rectifier bridge, can effectively control the current flowing through each string of LED lamp string to be constant, the length of the low-voltage LED lamp strip can be increased to 25 meters, the luminous flux of the front end and the rear end of each string of LED lamp string is consistent, the brightness display is uniform, the uniformity of the illumination intensity of an illuminated object can be improved, and the application range of the lamp strip is expanded.
Example two
Referring to fig. 2, fig. 2 is a circuit diagram of a second low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 2, the constant current module may include a constant current diode (CRD), an anode of the constant current diode (CRD) is connected to the first common terminal (a), and a cathode of the constant current diode (CRD) is connected to the second common terminal (b).
According to the embodiment of the application, the constant current diode is used as the constant current module to control the current flowing through each string of LED lamp strings to be constant, so that the luminous fluxes of the front end and the rear end of each string of LED lamp strings are consistent.
EXAMPLE III
Referring to fig. 3, fig. 3 is a circuit diagram of a third low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 3, the constant current module includes a first transistor (T1), a second transistor (T2), a first resistor (R1), a second resistor (R2), and a third resistor (R3).
Wherein, the base of the first triode (T1) is connected to the first end of the first resistor (R1), the second end of the first resistor (R1) is connected to the first end of the second resistor (R2) and the collector of the second triode (T2), the emitter of the first triode (T1) is connected to the first end of the third resistor (R3) and the base of the second triode (T2), the collector of the first triode (T1) and the second end of the second resistor (R2) are connected to the first common terminal (a), and the second end of the third resistor (R3) and the emitter of the second triode (T2) are connected to the second common terminal (b).
According to the embodiment of the application, the triode and the resistor are used as the constant current module to control the current flowing through each string of LED lamp strings to be constant, so that the luminous fluxes of the front end and the rear end of each string of LED lamp strings are consistent.
Example four
Referring to fig. 4, fig. 4 is a circuit diagram of a fourth low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 4, the constant current module includes a linear constant current chip (U1) and a fourth resistor (R4).
An LED cathode input end (LED) of the linear constant current chip (U1) is connected with the first common end (a), a ground end (GND) of the linear constant current chip (U1) is connected with the second common end (b), a first CS end (CS1) and a second CS end (CS2) of the linear constant current chip (U1) are both connected with a first end of the fourth resistor (R4), and a second end of the fourth resistor (R4) is connected with the second common end (b).
According to the embodiment of the application, the linear constant current chip and the resistor are used as the constant current module to control the current flowing through each string of LED lamp strings to be constant, so that the luminous fluxes of the front end and the rear end of each string of LED lamp strings are consistent.
EXAMPLE five
Referring to fig. 5, fig. 5 is a circuit diagram of a fifth low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 5, the low voltage LED strip further comprises: a first reversal module (located at the top left of fig. 5), a second reversal module (located at the top right of fig. 5), a third reversal module (located at the bottom left of fig. 5), and a fourth reversal module (located at the bottom right of fig. 5).
The first reverse module is also connected in series between the rear end of the first LED lamp string and the first common end (a), and is used for protecting the LEDs at the rear end of the first LED lamp string from being broken down by reverse voltage.
The second reverse module is also connected in series between the rear end of the second LED lamp string and the first common end (a), and is used for protecting the LEDs at the rear end of the second LED lamp string from being broken down by reverse voltage.
The third reverse module is also connected in series between the rear end of the third LED lamp string and the first end of the low-voltage alternating current power supply (AC-), and is used for protecting the LEDs at the rear end of the third LED lamp string from being broken down by reverse voltage.
The fourth reverse module is also connected in series between the rear end of the fourth LED lamp string and the second end of the low-voltage alternating current power supply (AC-), and is used for protecting the LEDs at the rear end of the fourth LED lamp string from being broken down by reverse voltage.
According to the embodiment of the application, the reverse module is added on the basis of the low-voltage LED lamp strip, so that LEDs at the front end and/or the rear end of each string of LED lamp strings can be better protected from being broken down by reverse voltage.
EXAMPLE six
Referring to fig. 6, fig. 6 is a circuit diagram of a sixth low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 6, the first reverse module includes a first reverse diode (D1), the rear end of the first LED string is connected to the anode of the first reverse diode (D1), and the cathode of the first reverse diode (D1) is connected to the first common terminal (a).
The second reverse module comprises a second reverse diode (D2), the rear end of the second LED lamp string is connected with the anode of the second reverse diode (D2), and the cathode of the second reverse diode (D2) is connected with the first common end (a).
The third reverse module comprises a third reverse diode (D3), the rear end of the third LED lamp string is connected with the anode of the third reverse diode (D3), and the cathode of the third reverse diode (D3) is connected with the first end of the low-voltage alternating current power supply (AC-).
The fourth reverse module comprises a fourth reverse diode (D4), the rear end of the fourth LED lamp string is connected with the anode of the fourth reverse diode (D4), and the cathode of the fourth reverse diode (D4) is connected with the second end of the low-voltage alternating current power supply (AC-).
The reverse diode is adopted as the reverse module in the embodiment of the application, so that the LEDs at the front end and/or the rear end of each string of LED lamp strings can be better protected from being broken down by reverse voltage.
EXAMPLE seven
Referring to fig. 7, fig. 7 is a circuit diagram of a seventh low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 7, the first inverter module includes a first field effect transistor (Q1), the rear end of the first LED string is connected to the source of the first field effect transistor (Q1), the drain of the first field effect transistor (Q1) is connected to the first common terminal, and the gate of the first field effect transistor (Q1) is connected to the first terminal of the low-voltage AC power supply (AC).
The second reversing module comprises a second field effect transistor (Q2), the rear end of the second LED lamp string is connected with the source electrode of the second field effect transistor (Q2), the drain electrode of the second field effect transistor (Q2) is connected with the first common end (a), and the grid electrode of the second field effect transistor (Q2) is connected with the second end of the low-voltage alternating current power supply (AC-).
The third reverse module comprises a third field effect transistor (Q3), the rear end of the third LED lamp string is connected with the source electrode of the third field effect transistor (Q3), the grid electrode of the third field effect transistor (Q3) is connected with the second common end (b), and the drain electrode of the third field effect transistor (Q3) is connected with the first end of the low-voltage alternating current power supply (AC-).
The fourth reversing module comprises a fourth field effect transistor (Q4), the rear end of the fourth LED lamp string is connected with the source electrode of the fourth field effect transistor (Q4), the grid electrode of the fourth field effect transistor (Q4) is connected with the second common end (b), and the drain electrode of the fourth field effect transistor (Q4) is connected with the second end of the low-voltage alternating current power supply (AC-).
According to the LED lamp string protection circuit, the field effect transistor is used as the reverse module, so that the LEDs at the front end and/or the rear end of each string of LED lamp strings can be better protected from being broken down by reverse voltage.
Example eight
Referring to fig. 8, fig. 8 is a circuit diagram of an eighth low-voltage LED strip provided in the embodiment of the present application. As shown in fig. 8, the first inverting module includes a first load switch (K1), the rear end of the first LED string is connected to the voltage input terminal of the first load switch (K1), and the voltage output terminal of the first load switch (K1) is connected to the first common terminal (a).
The second reverse module comprises a second load switch (K2), the rear end of the second LED lamp string is connected with the voltage input end of the second load switch (K2), and the voltage output end of the second load switch (K2) is connected with the first common end (a).
The third reverse module comprises a third load switch (K3), the rear end of the third LED lamp string is connected with the voltage input end of the third load switch (K3), and the voltage output end of the third load switch (K3) is connected with the first end of the low-voltage alternating-current power supply.
The fourth reversing module comprises a fourth load switch (K4), the rear end of the fourth LED lamp string is connected with the voltage input end of the fourth load switch (K4), and the voltage output end of the fourth load switch (K4) is connected with the second end of the low-voltage alternating-current power supply.
According to the embodiment of the application, the load switch is used as the reverse module, so that the LEDs at the front end and/or the rear end of each string of LED lamp strings can be better protected from being broken down by reverse voltage.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A low voltage LED strip, comprising: the LED lamp comprises a plurality of LEDs, a low-voltage alternating-current power supply and a constant-current module, wherein the LEDs are divided into four LED lamp strings, and the constant-current module is used for controlling the current flowing through each LED lamp string to be constant, so that the luminous fluxes of the front end and the rear end of each LED lamp string are consistent;
the front end of the first LED lamp string and the rear end of the third LED lamp string are respectively connected with the first end of the low-voltage alternating-current power supply, the front end of the second LED lamp string and the rear end of the fourth LED lamp string are respectively connected with the second end of the low-voltage alternating-current power supply, the rear end of the first LED lamp string and the rear end of the second LED lamp string are respectively connected with the first public end, the front end of the third LED lamp string and the front end of the fourth LED lamp string are respectively connected with the second public end, and the constant-current module is connected between the first public end and the second public end in parallel.
2. A low voltage LED strip according to claim 1, further comprising: the device comprises a first reverse module, a second reverse module, a third reverse module and a fourth reverse module; the first reverse module is used for protecting an LED at the rear end of the first LED lamp string from being broken down by reverse voltage, the second reverse module is used for protecting an LED at the rear end of the second LED lamp string from being broken down by reverse voltage, the third reverse module is used for protecting an LED at the rear end of the third LED lamp string from being broken down by reverse voltage, and the fourth reverse module is used for protecting an LED at the rear end of the fourth LED lamp string from being broken down by reverse voltage;
the first reverse module is further connected in series between the rear end of the first LED lamp string and the first public end, the second reverse module is further connected in series between the rear end of the second LED lamp string and the first public end, the third reverse module is further connected in series between the rear end of the third LED lamp string and the first end of the low-voltage alternating-current power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED lamp string and the second end of the low-voltage alternating-current power supply.
3. The low-voltage LED strip according to claim 1, wherein the number and type of LEDs in each string of LED strips are the same.
4. The low-voltage LED strip according to claim 1, wherein said constant current module comprises a constant current diode;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the anode of the constant current diode is connected with the first common end, and the cathode of the constant current diode is connected with the second common end.
5. The low-voltage LED lamp strip according to claim 1, wherein the constant current module comprises a first triode, a second triode, a first resistor, a second resistor and a third resistor;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the base electrode of the first triode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor and the collector electrode of the second triode respectively, the emitter electrode of the first triode is connected with the first end of the third resistor and the base electrode of the second triode respectively, the collector electrode of the first triode and the second end of the second resistor are connected with the first public end respectively, and the second end of the third resistor and the emitter electrode of the second triode are connected with the second public end.
6. The low-voltage LED lamp strip according to claim 1, wherein the constant current module comprises a linear constant current chip and a fourth resistor;
the constant current module is connected in parallel between the first common terminal and the second common terminal, and comprises:
the LED cathode input end of the linear constant current chip is connected with the first common end, the grounding end of the linear constant current chip is connected with the second common end, the first CS end and the second CS end of the linear constant current chip are both connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the second common end.
7. A low voltage LED light strip according to claim 2, wherein the first inverter module comprises a first inverter diode, the second inverter module comprises a second inverter diode, the third inverter module comprises a third inverter diode, and the fourth inverter module comprises a fourth inverter diode;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the anode of the first reverse diode, and the cathode of the first reverse diode is connected with the first common end;
the rear end of the second LED lamp string is connected with the anode of the second reverse diode, and the cathode of the second reverse diode is connected with the first common end;
the rear end of the third LED lamp string is connected with the anode of the third reverse diode, and the cathode of the third reverse diode is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the anode of the fourth reverse diode, and the cathode of the fourth reverse diode is connected with the second end of the low-voltage alternating-current power supply.
8. The low voltage LED light strip of claim 2, wherein said first inverter module comprises a first field effect transistor, said second inverter module comprises a second field effect transistor, said third inverter module comprises a third field effect transistor, and said fourth inverter module comprises a fourth field effect transistor;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the source electrode of the first field effect transistor, the drain electrode of the first field effect transistor is connected with the first common end, and the grid electrode of the first field effect transistor is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the second LED lamp string is connected with the source electrode of the second field effect transistor, the drain electrode of the second field effect transistor is connected with the first common end, and the grid electrode of the second field effect transistor is connected with the second end of the low-voltage alternating-current power supply;
the rear end of the third LED lamp string is connected with the source electrode of the third field effect transistor, the grid electrode of the third field effect transistor is connected with the second common end, and the drain electrode of the third field effect transistor is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the source electrode of the fourth field effect transistor, the grid electrode of the fourth field effect transistor is connected with the second common end, and the drain electrode of the fourth field effect transistor is connected with the second end of the low-voltage alternating-current power supply.
9. The low voltage LED light strip of claim 2, wherein the first reversing module comprises a first load switch, the second reversing module comprises a second load switch, the third reversing module comprises a third load switch, and the fourth reversing module comprises a fourth load switch;
the first reverse module is further connected in series between the rear end of the first LED light string and the first common end, the second reverse module is further connected in series between the rear end of the second LED light string and the first common end, the third reverse module is further connected in series between the rear end of the third LED light string and the first end of the low-voltage ac power supply, and the fourth reverse module is further connected in series between the rear end of the fourth LED light string and the second end of the low-voltage ac power supply, including:
the rear end of the first LED lamp string is connected with the voltage input end of the first load switch, and the voltage output end of the first load switch is connected with the first common end;
the rear end of the second LED lamp string is connected with the voltage input end of the second load switch, and the voltage output end of the second load switch is connected with the first common end;
the rear end of the third LED lamp string is connected with the voltage input end of the third load switch, and the voltage output end of the third load switch is connected with the first end of the low-voltage alternating-current power supply;
the rear end of the fourth LED lamp string is connected with the voltage input end of the fourth load switch, and the voltage output end of the fourth load switch is connected with the second end of the low-voltage alternating-current power supply.
10. A low voltage LED strip according to claim 1, wherein the low voltage LED strip has a length of 25 meters.
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| CN202111186168.2A CN113905484A (en) | 2021-10-12 | 2021-10-12 | Low-voltage LED lamp strip |
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| CN202111186168.2A CN113905484A (en) | 2021-10-12 | 2021-10-12 | Low-voltage LED lamp strip |
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