CN113645732B - Control circuit and control method for multiple groups of light-emitting diode lamp strings - Google Patents
Control circuit and control method for multiple groups of light-emitting diode lamp strings Download PDFInfo
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- CN113645732B CN113645732B CN202010391715.XA CN202010391715A CN113645732B CN 113645732 B CN113645732 B CN 113645732B CN 202010391715 A CN202010391715 A CN 202010391715A CN 113645732 B CN113645732 B CN 113645732B
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Abstract
The invention relates to a control circuit and a control method for a plurality of groups of LED lamp strings. A control circuit of a plurality of groups of light emitting diodes comprises a light emitting diode lamp string group, a controller and at least one identification resistor, wherein the light emitting diode lamp string group comprises a plurality of light emitting diode lamp strings which are connected in series through a single serial line, each light emitting diode lamp string group comprises at least one light emitting diode module, each light emitting diode module comprises a light emitting diode chip and a driving circuit which is electrically connected with the light emitting diode chip, the controller is electrically connected with the light emitting diode lamp string group, and the identification resistor is electrically connected with the serial line and is positioned behind an output end of the light emitting diode module. The driving circuit outputs a feedback signal and transmits the feedback signal back to the controller, the feedback signal passing through and not passing through the identification resistor has a different signal level, and the controller distinguishes different LED modules according to the signal level.
Description
Technical Field
The present invention relates to a control circuit and a control method for light emitting diodes, and more particularly to a control circuit and a control method for a plurality of groups of light emitting diodes.
Background
The light emitting diode has the characteristics of high light emitting efficiency, light volume, difficult damage and the like, is widely used in the field of daily illumination, and along with the change of the use requirement, the light emitting diodes with different numbers and colors are arranged in the illumination assembly to be normal, and meanwhile, in order to control the light emitting diodes with different numbers and colors to generate different light emitting effects, the control circuit is also arranged in the light emitting diode circuit.
In many applications, one of the light strings includes a plurality of led chips, and the light strings can be combined in series or parallel to achieve different lighting effects. For example, U.S. patent publication No. 10,429,016 discloses a light emitting diode light string with a stable current, which has a plug, a socket, a light string connected between the plug and the socket, and a control circuit provided in the plug or the socket. The control circuit uses at least one current controller to stably control the driving current flowing through the lamp string. When the temperature of the lamp string exceeds a threshold value, the current controller starts an overheat protection function to reduce the driving current; when the lamp string is short-circuited, the current controller starts the short-circuit protection function to reduce the driving current.
In the combined application of a plurality of light emitting diode light strings, in order to achieve diversified light emitting effects, each light emitting diode chip of the light emitting diode light strings needs to be sequenced, for example, before the light emitting diode light strings are assembled, data of different addresses are written into each light emitting diode chip, and the light emitting diode light strings need to be placed according to the addresses corresponding to the data during assembly, so that the method is complex, the cost is high, and the practicability is low; when the LED lamp string is to be expanded and additionally connected in series or in parallel, special luminous effect cannot be generated because the address data is not known.
Disclosure of Invention
The invention mainly aims to solve the problem that the prior LED lamp string is difficult to sequence and generates different luminous effects when a plurality of groups are connected in series or in parallel.
In order to achieve the above object, the present invention provides a control circuit for a plurality of groups of light emitting diode light strings, comprising: the LED lamp string group comprises a plurality of LED lamp strings which are connected in series through a single serial line, wherein the LED lamp strings respectively comprise at least one LED module, and the LED modules respectively comprise an LED chip and a driving circuit which is electrically connected with the LED chip; the controller is electrically connected with the LED lamp string group through the serial line; and at least one identification resistor electrically connected to the serial line and located behind an output end of the LED module; the driving circuit of the LED chip sequentially outputs a feedback signal respectively and transmits the feedback signal back to the controller through the serial line, the feedback signal passing through the identification resistor and not passing through the identification resistor have different signal levels, and the controller distinguishes different LED modules according to the signal levels.
A control circuit of a plurality of groups of LED lamp strings comprises: the at least one first light-emitting diode lamp string comprises at least one first light-emitting diode module which is connected in series with each other through a single first serial line, wherein the first light-emitting diode module respectively comprises a first light-emitting diode chip and a first driving circuit which is electrically connected with the first light-emitting diode chip; the at least one second light-emitting diode lamp string comprises at least one second light-emitting diode module which is connected in series through a single second serial line, wherein the second light-emitting diode module respectively comprises a second light-emitting diode chip and a second driving circuit which is electrically connected with the second light-emitting diode chip; the controller is electrically connected with the first LED light string and the second LED light string through the first serial line and the second serial line; and at least one identification resistor electrically connected to the first or the second serial connection line and located behind an output end of the first or the second light emitting diode module; the first and the second driving circuits output a feedback signal respectively in sequence and transmit the feedback signal back to the controller through the first and the second serial lines, the feedback signal passing through and not passing through the identification resistor has different signal levels, and the controller distinguishes the different LED modules according to the signal levels.
A control method of a plurality of groups of LED lamp strings comprises the following steps: step 1: providing a light emitting diode circuit, wherein the light emitting diode circuit comprises a light emitting diode lamp string group, a controller and an identification resistor, the light emitting diode lamp string group comprises a plurality of light emitting diode lamp strings electrically connected with each other through a connecting wire, the controller is electrically connected to the light emitting diode lamp strings, and the identification resistor is electrically connected behind an output end of one of the light emitting diode modules; step 2: the LED modules connected on the line sequentially output a feedback signal respectively and transmit the feedback signal back to the controller through the connecting line; step 3: the feedback signal passing through and not passing through the identification resistor has a different signal level, and the controller distinguishes the different LED modules according to the signal level.
The invention uses the setting of the identification resistor to enable the feedback signal returned by each segment of LED lamp string to have different signal levels so as to enable the controller to distinguish different LED lamp strings according to the signal levels, thereby giving different signals to the LED lamp strings of different segments and achieving specific luminous effect. In addition, as only the identification resistor is needed, the cost is low, the manufacturing is convenient, the light emitting variability can be increased under the condition of not greatly increasing the cost, and the identification effect can be achieved even if the LED lamp string is additionally expanded in a serial or parallel connection mode.
Drawings
Fig. 1 is a schematic diagram of a circuit architecture according to an embodiment of the invention.
Fig. 2 is a schematic circuit diagram of the led string of fig. 1.
Fig. 3 is a schematic diagram of a circuit architecture according to another embodiment of the invention.
Detailed Description
The detailed description and technical content of the present invention will now be described with reference to the drawings.
Fig. 1 is a schematic circuit diagram of a circuit architecture according to an embodiment of the invention, fig. 1 shows a control circuit of a plurality of led strings, including an led string set 10, a controller 20 and at least one identification resistor 30, the led string set 10 includes a plurality of led strings, in this embodiment, the led string includes a first led string 10a, a second led string 10b and a third led string 10c, the first led string 10a, the second led string 10b and the third led string 10c are connected in series with each other through a single string connection 40, and the led strings are electrically connected to the controller 20 through the string connection 40, thereby forming a series connection relationship. The led string light includes at least one led module, in this embodiment, the first led string light 10a includes four led modules, respectively designated as a-1, a-2, a-3, a-4, the second led string light 10b includes three led modules, respectively designated as b-1, b-2, b-3, and the third led string light 10c includes four led modules, respectively designated as c-1, c-2, c-3, and c-4.
Referring to fig. 2, the first led string 10a includes a plurality of led modules 11a, 12a, 13a, 14a, and the led modules 11a, 12a, 13a, 14a include led chips 111a, 121a, 131a, 141a and a driving circuit 112a, 122a, 132a, 142a, respectively, the driving circuit 112a, 122a, 132a, 142a is connected in series with the serial line 40, and the led chips 111a, 121a, 131a, 141a are electrically connected to the driving circuit 112a, 122a, 132a, 142a. In the present invention, the led module further includes a feedback circuit, illustrated as the led module 11b, and the led module 11b further includes a feedback circuit 113b, wherein the feedback circuit 113b is disposed in the led module 11b and includes a first feedback section 1131b and a second feedback section 1132b, the first feedback section 1131b is connected between an output terminal 1121b and a feedback input terminal 1122b of the driving circuit 112b, and the second feedback section 1132b is connected between an input terminal 1123b and a feedback output terminal 1124b of the driving circuit 112b, thereby forming a feedback path for the driving circuit 112b in the led module 11 b.
As shown in fig. 1, the identification resistor 30 includes a first identification resistor 30a, a second identification resistor 30b and a third identification resistor 30c, in which, in the present invention, the identification resistor 30 is electrically connected to the serial line 40 and is located behind an output end of the led module, specifically, the identification resistor 30 is located behind the output end of the led module at the end of the led string, or may be defined as that the identification resistor 30 is located in front of an input end of the second led string in the led string group. As shown in fig. 2, the first identification resistor 30a is electrically connected to the serial line 40 and is located behind the output end of the led module 14a (before the input end 1123b of the led module 11 b).
In operation, the control circuit has a start mode and a detection mode, in which the controller 20 transmits a start command to the led modules 11a, 12a, 13a, 14a, 11b via the serial line 40 to control the led modules 11a, 12a, 13a, 14a, 11b to emit light; in the detection mode, the driving circuits 112a, 122a, 132a, 142a, 112b sequentially output a feedback signal to the controller 20 via the feedback path and the serial line 40. Since the present invention provides the identification resistor 30 on the serial line 40, the feedback signal passing through and not passing through the identification resistor 30 has a different signal level, and the controller 20 can distinguish the different led modules according to the signal level. Further, for the feedback signals sequentially transmitted from the driving circuits 112a, 122a, 132a, 142a through the feedback path and the serial line 40, the feedback signals do not pass through the identification resistor since the identification resistor is not disposed before the led module 14 a; for the feedback signal returned by the driving circuit 112b through the feedback path and the serial line 40, the feedback signal passes through the identification resistor 30a before the led module 11 b. Therefore, the feedback signal received by the controller 20 and transmitted by the driving circuit 112a, 122a, 132a, 142a has a first signal level, the feedback signal received by the controller 20 and transmitted by the driving circuit 112b has a second signal level, the led modules 11a, 12a, 13a, 14a corresponding to the first signal level are defined as a first group, and the led module 11b corresponding to the second signal level is defined as a second group. In this way, the controller 20 can know the number of led modules of the led string of each segment, so as to give different signals to the led strings of different segments, thereby achieving a specific lighting effect.
Referring to fig. 3, which is a schematic circuit diagram of a circuit architecture according to another embodiment of the present invention, the control circuit of the multiple led strings shown in fig. 3 includes a first led string set 10, a second led string 50, a third led string 60, a controller 20 and at least one identification resistor, and the embodiment is exemplified by the multiple led string sets in parallel connection, and the difference between the present embodiment and the present embodiment is that the first led string set 10 is connected in series with each other through a single string wire 40a, the second led string 50 is connected in series with each other through a single string wire 40b, the third led string 60 is connected in series with each other through a single string wire 40c, and the first led string set 10, the second led string 50 and the third led string 60 are connected in parallel with each other. The first LED string set 10 includes a plurality of LED strings 10a, 10b, the second LED string set 50 includes a plurality of LED strings 50a, 50b, 50c, and the third LED string 60 includes a plurality of LED strings 60a, 60b.
In each LED light string, the output end of the LED module at the tail end is electrically connected with the identification resistor. The first identification resistor 30a and the second identification resistor 30b are respectively arranged in the LED lamp strings 10a and 10 b; the identification resistors 31a, 31b, 31c are respectively disposed in the led strings 50a, 50b, 50 c; the identification resistors 32a, 32b are respectively disposed in the LED strings 60a, 60b. In this way, the controller 20 can know the number of led modules of the led string of each segment, so as to give different signals to the led strings of different segments, thereby achieving a specific lighting effect.
Claims (6)
1. A control circuit of a plurality of groups of LED lamp strings is characterized by comprising:
the LED lamp string group comprises a plurality of LED lamp strings which are connected in series through a single serial line, wherein the LED lamp strings respectively comprise at least one LED module, and the LED modules respectively comprise an LED chip and a driving circuit which is electrically connected with the LED chip;
the controller is electrically connected with the LED lamp string group through the serial line; and
at least one identification resistor electrically connected to the serial line and located behind an output end of the LED module;
the driving circuit of the LED chip sequentially outputs a feedback signal respectively and transmits the feedback signal back to the controller through the serial line, the feedback signal passing through the identification resistor and not passing through the identification resistor have different signal levels, and the controller distinguishes different LED modules according to the signal levels.
2. A control circuit of a plurality of groups of LED lamp strings is characterized by comprising:
the at least one first light-emitting diode lamp string comprises at least one first light-emitting diode module which is connected in series with each other through a single first serial line, wherein the first light-emitting diode module respectively comprises a first light-emitting diode chip and a first driving circuit which is electrically connected with the first light-emitting diode chip;
the at least one second light-emitting diode lamp string comprises at least one second light-emitting diode module which is connected in series through a single second serial line, wherein the second light-emitting diode module respectively comprises a second light-emitting diode chip and a second driving circuit which is electrically connected with the second light-emitting diode chip;
the controller is electrically connected with the first LED lamp string and the second LED lamp string through the first serial connection wire and the second serial connection wire; and
the identification resistor is electrically connected with the first string connection wire or the second string connection wire and is positioned behind an output end of the first light-emitting diode module or the second light-emitting diode module;
the first driving circuit and the second driving circuit respectively output a feedback signal in sequence and transmit the feedback signal back to the controller through the first serial connection line and the second serial connection line, the feedback signal passing through the identification resistor and not passing through the identification resistor have different signal levels, and the controller distinguishes different LED modules according to the signal levels.
3. The control method of the multi-group LED lamp string is characterized by comprising the following steps:
step 1: providing a light emitting diode circuit, wherein the light emitting diode circuit comprises a light emitting diode lamp string group, a controller and an identification resistor, the light emitting diode lamp string group comprises a plurality of light emitting diode lamp strings electrically connected with each other through a connecting wire, the light emitting diode lamp strings respectively comprise at least one light emitting diode module, the controller is electrically connected to the light emitting diode lamp strings, and the identification resistor is electrically connected behind an output end of one of the light emitting diode modules;
step 2: the LED modules connected on the line sequentially output a feedback signal respectively and transmit the feedback signal back to the controller through the connecting line;
step 3: the feedback signal passing through and not passing through the identification resistor has a different signal level, and the controller distinguishes the different LED modules according to the signal level.
4. The control method of claim 3, wherein the feedback signal not passing through the identification resistor has a first signal level, the feedback signal passing through the identification resistor has a second signal level, the led module corresponding to the first signal level is defined as a first group, and the led module corresponding to the second signal level is defined as a second group.
5. The control method of claim 3, wherein the LED strings are serially connected to each other by a single serial line.
6. The control method of claim 3, wherein the LED strings are connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391715.XA CN113645732B (en) | 2020-05-11 | 2020-05-11 | Control circuit and control method for multiple groups of light-emitting diode lamp strings |
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| CN202010391715.XA CN113645732B (en) | 2020-05-11 | 2020-05-11 | Control circuit and control method for multiple groups of light-emitting diode lamp strings |
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| CN113645732B true CN113645732B (en) | 2024-02-09 |
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