CN115278976A - Series structure of cascaded point-controlled LED lamp string and series-parallel structure thereof - Google Patents
Series structure of cascaded point-controlled LED lamp string and series-parallel structure thereof Download PDFInfo
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- CN115278976A CN115278976A CN202210982501.9A CN202210982501A CN115278976A CN 115278976 A CN115278976 A CN 115278976A CN 202210982501 A CN202210982501 A CN 202210982501A CN 115278976 A CN115278976 A CN 115278976A
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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]
- H05B45/10—Controlling the intensity of the light
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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
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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
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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 invention provides a series structure and a series-parallel structure of a cascade point-control LED lamp string, belonging to the technical field of lamp strings. The LED lamp bead cascade connection device solves the technical problems that the tail end LED lamp beads generated after the LED lamp beads are cascade-connected and increased become dark and the heat loss is large. The LED lamp comprises a plurality of LED lamp beads with built-in chips, wherein the LEDs are connected onto the chips, the LEDs are controlled to be on and off by the chips, positive power supply pins and negative power supply pins of the chips are sequentially connected in series, voltage stabilizing diodes are connected in parallel to the positive power supply pins and the negative power supply pins of each chip, signal input pins and signal output pins of the chips are sequentially connected in series, diodes or resistors or capacitors are connected in series between the signal input pins and the signal output pins of two adjacent chips, the signal input pins of each chip are connected with pull resistors, and the pull resistors are connected to the positive power supply pins and the negative power supply pins of the chips to form common positive or common negative connection. This application adopts series connection structure, secondly has adopted high-pressure transmission, and the electric current is less, and the decay is less, reduces the heat waste, has guaranteed the luminance of every LED lamp pearl.
Description
Technical Field
The invention relates to the technical field of lamp strings, in particular to a lamp string with built-in chip LED lamp beads, and particularly relates to a cascaded connection structure of the built-in chip LED lamp beads.
Background
The existing point control LED lamp string generally comprises a power supply controller and a lamp string connected in the power supply controller, a very small control chip is integrated in an LED lamp bead in the point control LED lamp string, a unique address code is stored in the control chip, and the power supply controller controls the aspects of lighting and extinguishing, color and the like of the LED lamp bead in an addressing mode.
The working process of the LED lamp string is that the control program stored in the power controller controls the on and off of each LED lamp bead in the LED lamp string, so that the whole LED lamp string can show different patterns, such as flowing water patterns, flashing patterns and the like, particularly RGB three-color LED lamp beads can show different colors after point control, and the LED lamp string is applied to Christmas tree dynamic pattern decoration, building appearance dynamic patterns and the like and has a very large application prospect.
However, the existing point-control LED lamp beads are limited in structure, and can only be connected in parallel to a bus for power supply, and can keep the stability of the power supply voltage when being connected in parallel to the bus, which is an excellent solution in the application scenario of short lamp string length, but in the application scenario of long lamp string length, as the cascade connection of the LED lamp beads is increased, the current on the bus becomes larger because of the parallel connection of more LED lamp beads, the required bus needs to become thicker for application, the bus not only becomes thicker to cause the increase of hardness during wiring, but also the heat loss is increased because of the longer distance, and the LED lamp beads at the tail end also become darker because of the voltage attenuation.
Disclosure of Invention
The invention aims to provide a series structure of a cascade point control LED lamp string aiming at the problems in the prior art, and the technical problems to be solved by the invention are that: how to realize the random cascade connection of the LED lamp strings in the long-distance lamp string.
The purpose of the invention can be realized by the following technical scheme: a series connection structure of a cascade point control LED lamp string comprises a plurality of LED lamp beads with built-in chips, wherein LEDs are connected on the chips and are controlled to be on or off by the chips.
The LED lamp string adopts the serial connection of the chips for cascade connection, and the power supply of the chips can be clamped on a preset rated value while the circuit is conducted through the voltage stabilizing diode, so that the positive and negative power supply pins of the chips are connected in series. The signal transmission between the chips also adopts the one-way transmission of the serial form, and the signals between the two chips are isolated by utilizing a diode, a resistor and a capacitor between the input signal pin and the output signal pin, so that the backflow of the signals is avoided. The diode is isolated by utilizing the principle of unidirectional conduction, the resistor is isolated by utilizing high voltage generated by the resistance value of the resistor, only the voltage higher than the resistor is allowed to pass through current (high level), the low level lower than the resistor is isolated, the capacitor adopts a small-capacity capacitor, the capacitor is just equal to the high level, and the signal is transmitted by utilizing the principles of high level charging and low level discharging.
In the series structure of the cascade point-control LED lamp string, a bypass conducting wire is connected between the signal input pin and the signal output pin of each chip, and when the signal input pin and the signal output pin are disconnected, the signal input pin and the signal output pin are communicated through the bypass conducting wire. Through the structure, the signal transmission channel of the series structure can not be blocked because a certain LED lamp bead is damaged.
In the series structure of the cascade point-control LED lamp string, the pull resistor is a pull-up resistor, a signal input pin of each chip is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with a negative power supply pin of the chip.
In the series structure of the cascade point-control LED lamp string, the pull-up resistor is a pull-down resistor, a signal input pin of each chip is connected with one end of the pull-down resistor, and the other end of the pull-down resistor is connected with a positive power supply pin of the chip.
A series-parallel connection structure of a cascaded point-control LED lamp string comprises a plurality of lamp string groups and is characterized in that each lamp string group is divided into the point-control LED lamp strings of the series connection structure, positive and negative power supply pins in each lamp string group are connected in series to form positive and negative ends of the lamp string group, the positive and negative ends of each lamp string group are connected in parallel, signal input pins and signal output pins in each lamp string group are connected in series to form signal input ends and signal output ends of the lamp string group, the signal output ends and the signal input ends of two adjacent lamp string groups are connected in series, pull resistors of the lamp string group where the signal output end is located are connected in a common negative mode, and pull resistors of the lamp string group where the signal input end is located are connected in a common positive mode.
The LED lamp strings in the series structure need to provide higher voltage, the LED lamp strings in the general series structure also have certain length limitation for safety, and the two LED lamp strings in the series structure are secondarily prolonged in a parallel connection mode on the basis of the series structure, so that the lamp strings can provide longer length. Because of the serial connection structure, the high and low levels of the signals of the two strings of light strings can not be connected, the pull resistors of the light string groups where the signal output ends are located are connected in a common negative mode, the pull resistors of the light string groups where the signal input ends are located are connected in a common positive mode, and signal transmission in a signal serial connection mode is extended.
The series-parallel connection structure of the cascaded point-control LED lamp string is characterized in that each group of lamp string groups is the point-control LED lamp string of the series connection structure, positive and negative power supply pins in each group of lamp string groups are connected in series to form positive and negative ends of the lamp string groups, the positive and negative ends of each group of lamp string groups are connected in parallel, signal input pins and signal output pins in each group of lamp string groups are connected in series to form signal input ends and signal output ends of the lamp string groups, the signal output ends and the signal input ends of two adjacent groups of lamp string groups are connected through optical couplers, pull resistors in each group of lamp string groups are connected in the same mode, and one of common negative connection or common positive connection is adopted.
High and low level signals are isolated by the optical coupler, so that the two lamp strings transmit signals in the same mode.
The series-parallel connection structure of the cascaded point-control LED lamp string is characterized in that each group of lamp string groups is the point-control LED lamp string of the series connection structure, positive and negative power supply pins in each group of lamp string groups are connected in series to form positive and negative ends of the lamp string groups, the positive and negative ends of each group of lamp string groups are connected in parallel, signal input pins and signal output pins in each group of lamp string groups are connected in series to form signal input ends and signal output ends of the lamp string groups, the signal output ends and the signal input ends of two adjacent groups of lamp string groups are connected through a capacitor circuit, pull-up resistors in each group of lamp string groups are connected in the same mode, and one of common-negative connection or common-positive connection is adopted.
In the series-parallel connection structure of the cascaded point-controlled LED lamp string, the capacitor circuit comprises a blocking capacitor, a first resistor and a second resistor, two adjacent lamp string groups comprise an output signal pin of one lamp string group and a signal input pin of the other lamp string group, a transmission capacitor and the blocking capacitor are sequentially connected in series between the signal output pin and the signal input pin, the output end of the blocking capacitor is respectively connected with the first resistor and the second resistor, the other end of the first resistor is connected with a power supply end, and the other end of the second resistor is connected with a grounding end. The high and low level signals are converted through the capacitor circuit, so that the level signals can be suitable for another group of LED lamp strings.
Compared with the prior art, the invention has the following advantages:
1. the cascade point-control LED lamp string adopts a series structure of positive and negative power supply pins of a chip, so that the same current can be kept for working when any LED lamp bead is cascaded, high-voltage transmission is adopted, the current is small, the attenuation is small, and the brightness of each LED lamp bead is ensured.
2. Although the high-voltage transmission of the series structure is adopted, the voltage stabilizing diode is utilized for stabilizing voltage, and the normal power supply of each LED lamp bead is ensured.
3. The communication mode of series connection is adopted, and a bypass conducting wire structure is designed, so that the failed LED lamp beads can be shielded by the series communication line, and the smoothness of the communication line is kept.
Drawings
FIG. 1 is a schematic structural diagram of an LED lamp bead with a built-in chip according to the invention;
FIG. 2 is a schematic diagram of a series-parallel configuration in accordance with one embodiment;
FIG. 3 is a schematic diagram of a series-parallel configuration according to a second embodiment;
FIG. 4 is a schematic diagram of a series-parallel structure in the third embodiment;
FIG. 5 is a schematic diagram of a series-parallel structure in a fourth embodiment;
FIG. 6 is a schematic diagram showing a series-parallel structure according to a fifth embodiment;
fig. 7 is a schematic diagram of a series-parallel structure in the sixth embodiment.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The first embodiment is as follows:
as shown in fig. 2, the series structure of the cascade point-control LED lamp string includes a plurality of LED lamp beads with built-in chips, as shown in fig. 1, the LED lamp beads include a chip IC and an RGB three-color LED connected with the chip IC, a positive power supply pin VDD, a negative power supply pin GND, a signal input pin Din and a signal output pin Vo are arranged in the chip IC, and a bypass conduction line structure (indicated by a dotted line) is arranged between the signal input pin Din and the signal output pin Vo. The LED lamp bead is a basic unit, and the basic unit is cascaded in a series connection mode to form a cascaded point-control LED lamp string capable of being controlled in a point-control mode.
Referring to fig. 2, positive and negative power supply pins VDD and GND of each chip are sequentially connected in series, and zener diodes WD1, WD2, \8230 \, WD30 are connected in parallel to the positive and negative power supply pins of each chip, and diodes TD1, TD2, \8230 \ 8230 \ TD30, are connected in series between the signal input pin DIN and the signal output pin Do of two adjacent chips, and the signal input pin DIN of each chip is connected with pull resistors R1, R2, \8230 \, R30, which are connected to the positive and negative power supply pins of the chip to form a common anode or common cathode connection.
Specifically, as shown in fig. 2, the first string of LED light strings LED1, LED2, \8230:, pull resistors of LED10 are pull-up resistors R1, R2, \8230 \ 8230;, R10 and signal input pins DIN of each chip are connected to one end (i.e., the first end) of the corresponding pull-up resistor, the other end (i.e., the second end) of the pull-up resistor is connected to a positive power supply pin Vcc of the chip, and a signal source output end is connected to the first end, under this connection method, a signal output pin Do of a previous chip (e.g., LED 1) is connected to an anode of a voltage regulator tube TD1, a cathode of the voltage regulator tube TD1 is connected to a signal output pin DIN of a subsequent chip (LED 2), and this connection method is defined as signal common cathode connection in this application, near a GND terminal. The third string of LED light strings LED21, LED2, \8230 \ 8230:, LED30 is connected as the first string of LED light strings.
The second string of LED light string comprises LED11, LED12, \8230- \8230: \ 8230:, pull-down resistors R11, R12, \8230 \ 8230;, and R20 of the LED20, wherein a signal input pin DIN of each chip is connected with the corresponding pull-down resistors R11, R12, \\8230;, and one end (namely, a first end) of R20 is connected, the other end (namely, a second end) of the pull-down resistor is connected with a negative power supply pin of the chip, a signal source output end is connected to the first end, a signal output pin Do of the previous chip (LED 11) is connected with a cathode of a voltage regulator TD11, an anode of the voltage regulator TD11 is connected with a signal output pin DIN of the next chip (LED 12), and the connection method is close to a VDD end and is defined as signal connection in the application.
For safety, the LED strings in the series structure are limited in length, and the two LED strings in the series structure are extended twice in parallel based on the series structure, so that the strings can have a longer length. On the basis of the serial connection, one serial LED lamp string is defined as a lamp string group, for example, a first LED lamp string LED1, an LED2, a lamp string 8230, a lamp string LED10, a second LED lamp string LED11, an LED12, a lamp string 8230, a lamp string LED20, a third LED lamp string LED21, a lamp string LED2, a lamp string 8230, a lamp string 8230and an LED30 are three lamp string groups, positive and negative power supply pins VDD and GND in each lamp string group are connected in series to form positive and negative ends VCC and GND of the lamp string group, the positive and negative ends of each lamp string group are connected in parallel, a signal input pin DIN and a signal output pin Do in each lamp string group are connected in series to form a signal input end and a signal output end of the lamp string group, signal output ends and signal input ends of two adjacent lamp string groups are connected in series, the pull-up resistors of the lamp strings in the lamp string group in which the signal output ends are located are connected in a common-negative mode, and the pull-up resistors of the lamp string group in which the signal input ends are located are connected in a common-up mode.
The working principle of the application is as follows: the LED lamp string is cascaded in a chip series connection mode, and the power supply of the chip can be clamped on a preset rated value while the circuit is conducted through the voltage stabilizing diode, so that positive and negative power supply pins of the chip are connected in series. The signal transmission between the chips also adopts the unidirectional transmission in a serial form, and the pins of input and output signals are isolated by using the unidirectional conduction principle of a diode. The optimal scheme is that a voltage stabilizing diode is adopted, and a common unidirectional diode can also be suitable. A bypass conducting wire is connected between a signal input pin DIN and a signal output pin Do of each chip, when the signal input pin DIN and the signal output pin Do are disconnected, the signal input pin DIN and the signal output pin Do are communicated through the bypass conducting wire, and the LED lamp bead with the fault is disconnected. Through the structure, the signal transmission channel of the series structure can not be blocked because a certain LED lamp bead is damaged.
Example two:
the second embodiment is basically the same as the first embodiment, and is different in that, as shown in fig. 3, the signal output ends and the signal input ends of two adjacent groups of light string groups are connected through an optical coupler connector, and the pull-up resistors in each group of light string groups are connected in the same manner, and adopt one of common-negative connection or common-positive connection.
Example three:
the third embodiment is substantially the same as the first embodiment, except that resistors R54, R55, \8230;, R83 are connected in series between the signal input pin DIN and the signal output pin Do of two adjacent chips in a single series LED string as shown in fig. 4. The resistance is carried out by utilizing high voltage generated by resistance value of the resistance, only the voltage higher than the resistance value is allowed to pass through current (high level), and the low level lower than the resistance value is isolated.
Example four:
the fourth embodiment is basically the same as the third embodiment, and is different in that, as shown in fig. 5, the signal output end and the signal input end of two adjacent groups of light strings are connected in series with a capacitor circuit, the capacitor circuit includes a blocking capacitor C1, a first resistor R52 and a second resistor R51, the two adjacent groups of light strings include an output signal pin of one group of light strings and a signal input pin DIN of the other group of light strings, a transmission resistor and a blocking capacitor are sequentially connected in series between the signal output pin Do and the signal input pin DIN, the output end of the blocking capacitor C1 is respectively connected with the first resistor R52 and the second resistor R51, the other end of the first resistor R52 is connected with a power supply terminal, and the other end of the second resistor R51 is connected with a ground terminal. The high and low level signals are converted through the capacitor circuit, so that the level signals can be suitable for another group of LED lamp strings.
Example five:
the fifth embodiment is substantially the same as the first embodiment, except that capacitors C1, C2, \8230;, C49 are connected in series between the signal input pin DIN and the signal output pin Do of two adjacent chips in a single series LED string as shown in fig. 6. The capacitor adopts a small-capacity capacitor, the capacitor is just equal to a high level, and a signal is transmitted by utilizing the principle of high level charging and low level discharging.
Example six:
the sixth embodiment is basically the same as the fifth embodiment, and is different in that, as shown in fig. 7, the signal output end and the signal input end of two adjacent light string groups are connected in series with a capacitor circuit, the capacitor circuit includes a blocking capacitor C1, a first resistor R52 and a second resistor R51, the two adjacent light string groups include a signal output pin Do of one light string group and a signal input pin DIN of another light string group, a transmission capacitor C30 and a blocking capacitor C1 are connected in series between the signal output pin Do and the signal input pin DIN, the output end of the blocking capacitor C1 is connected to the first resistor R52 and the second resistor R51, the other end of the first resistor R52 is connected to a power supply terminal, and the other end of the second resistor R51 is connected to a ground terminal. The high and low level signals are converted through the capacitor circuit, so that the level signals can be suitable for another group of LED lamp strings.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A series connection structure of a cascade point control LED lamp string comprises a plurality of LED lamp beads with built-in chips, wherein LEDs are connected on the chips and are controlled to be on or off by the chips.
2. The series connection structure of the cascade point-control LED lamp strings according to claim 1, wherein a bypass conduction line is connected between the signal input pin and the signal output pin of each chip, and when the signal input pin and the signal output pin are disconnected, the signal input pin and the signal output pin are communicated through the bypass conduction line.
3. The series connection structure of the cascade point-control LED lamp strings according to claim 1 or 2, wherein the pull-up resistor is a pull-up resistor, a signal input pin of each chip is connected with one end of the pull-up resistor, the other end of the pull-up resistor is connected with a positive power supply pin of the chip, a signal output pin of the previous chip is connected with an anode of a voltage regulator tube, and a cathode of the voltage regulator tube is connected with a signal output pin of the next chip.
4. The series connection structure of the cascade point-control LED lamp strings according to claim 1 or 2, wherein the pull-up resistor is a pull-down resistor, a signal input pin of each chip is connected with one end of the pull-down resistor, the other end of the pull-down resistor is connected with a negative power supply pin of the chip, a signal output pin of a previous chip is connected with a cathode of a voltage regulator tube, and an anode of the voltage regulator tube is connected with a signal output pin of a next chip.
5. A series-parallel connection structure of a cascade point control LED lamp string comprises a plurality of lamp string groups, and is characterized in that each lamp string group adopts a series connection structure of any one of claims 1 to 4, positive and negative power supply pins in each lamp string group are connected in series to form positive and negative ends of the lamp string group, the positive and negative ends of each lamp string group are connected in parallel, a signal input pin and a signal output pin in each lamp string group are connected in series to form a signal input end and a signal output end of the lamp string group, the signal output ends and the signal input ends of two adjacent lamp string groups are connected in series, pull-up resistors of the lamp string groups where the signal output ends are located are connected in a common negative mode, and pull-up resistors of the lamp string groups where the signal input ends are located are connected in a common positive mode.
6. A series-parallel connection structure of a cascade point control LED lamp string comprises a plurality of lamp string groups, and is characterized in that each lamp string group adopts a series connection structure of any one of claims 1 to 3, positive and negative power supply pins in each lamp string group are connected in series to form positive and negative ends of the lamp string group, the positive and negative ends of each lamp string group are connected in parallel, a signal input pin and a signal output pin in each lamp string group are connected in series to form a signal input end and a signal output end of the lamp string group, the signal output end and the signal input end of two adjacent lamp string groups are connected through an optical coupler, pull-up resistor connection modes in each lamp string group are the same, and one of common negative connection or common positive connection is adopted.
7. A series-parallel connection structure of a cascade point control LED lamp string comprises a plurality of lamp string groups, and is characterized in that each lamp string group adopts a series connection structure of any one of claims 1 to 3, positive and negative power supply pins in each lamp string group are connected in series to form positive and negative ends of the lamp string group, the positive and negative ends of each lamp string group are connected in parallel, a signal input pin and a signal output pin in each lamp string group are connected in series to form a signal input end and a signal output end of the lamp string group, the signal output ends and the signal input ends of two adjacent lamp string groups are connected through a capacitor circuit, pull-out resistor connection modes in each lamp string group are the same, and one of common-negative connection or common-positive connection is adopted.
8. The series-parallel connection structure of the cascaded point-controlled LED lamp string as claimed in claim 7, wherein the capacitor circuit comprises a blocking capacitor, a first resistor and a second resistor, two adjacent lamp string groups comprise an output signal pin of one lamp string group and a signal input pin of the other lamp string group, the blocking capacitor is connected in series between the signal output pin and the signal input pin, the output end of the blocking capacitor is connected with the first resistor and the second resistor respectively, the other end of the first resistor is connected with a power supply terminal, and the other end of the second resistor is connected with a ground terminal.
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| CN202210982501.9A CN115278976A (en) | 2022-08-16 | 2022-08-16 | Series structure of cascaded point-controlled LED lamp string and series-parallel structure thereof |
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| CN202210982501.9A CN115278976A (en) | 2022-08-16 | 2022-08-16 | Series structure of cascaded point-controlled LED lamp string and series-parallel structure thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116723606A (en) * | 2023-08-10 | 2023-09-08 | 深圳市美矽微半导体有限公司 | Breakpoint continuous transmission module based on serial system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116723606A (en) * | 2023-08-10 | 2023-09-08 | 深圳市美矽微半导体有限公司 | Breakpoint continuous transmission module based on serial system |
| CN116723606B (en) * | 2023-08-10 | 2023-12-12 | 深圳市美矽微半导体股份有限公司 | Breakpoint continuous transmission module based on serial system |
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