CN113645732A - 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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- CN113645732A CN113645732A CN202010391715.XA CN202010391715A CN113645732A CN 113645732 A CN113645732 A CN 113645732A CN 202010391715 A CN202010391715 A CN 202010391715A CN 113645732 A CN113645732 A CN 113645732A
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Abstract
The invention relates to a control circuit and a control method for a plurality of groups of light-emitting diode 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 connection line, the light-emitting diode lamp string group respectively comprises at least one light-emitting diode module, the light-emitting diode module respectively comprises a light-emitting diode chip and a drive 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 connection line and is positioned behind an output end of the light-emitting diode module. The driving circuit respectively outputs a feedback signal and returns the feedback signal to the controller, the feedback signal passing through the identification resistor and the feedback signal not passing through the identification resistor have different signal levels, and the controller distinguishes different light emitting diode modules according to the signal levels.
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 multiple groups of light emitting diodes.
Background
The light emitting diodes have the characteristics of high light emitting efficiency, light volume, difficulty in damage and the like, are generally used in the field of daily lighting, and along with the change of the use requirements, the arrangement of the light emitting diodes with different numbers and colors in the lighting assembly is also a normal state, 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 application domains, one of them is a light string including a plurality of led chips, and the light string can be combined in series or in parallel to achieve different light emitting effects. For example, U.S. patent publication No. US 10,429,016 discloses a light emitting diode string with a stabilized 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 string of lights. 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 lighting string is short-circuited, the current controller starts a short-circuit protection function to reduce the driving current.
In the combined application of a plurality of led strings, the led strings are numerous, and in order to achieve diversified light emitting effects, each led chip of the led strings needs to be sequenced, for example, before the led strings are assembled, data of different addresses are written into each led chip, and the led chips need to be placed according to the addresses corresponding to the data during assembly, so that the method is complicated, high in cost and low in practicability; when the LED light string is added in series or in parallel for expansion, the special light-emitting effect can not be generated because the address data is unknown.
Disclosure of Invention
The invention mainly aims to solve the problem that the prior LED lamp strings are difficult to sequence to generate different light-emitting effects when a plurality of groups of LED lamp strings are connected in series or in parallel.
To achieve the above object, the present invention provides a control circuit for multiple led strings, comprising: the LED lamp string set comprises a plurality of LED lamp strings which are connected in series with each other through a single serial connection wire, each LED lamp string comprises at least one LED module, and each LED module comprises an LED chip and a driving circuit which is electrically connected with the LED chip; the controller is electrically connected with the light-emitting diode lamp string group through the serial line; the identification resistor is electrically connected to the serial line and is positioned behind an output end of the light-emitting diode module; the driving circuit of the LED chip outputs a feedback signal in sequence and returns the feedback signal to the controller through the serial connection line, the feedback signal passing through the identification resistor and the feedback signal 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 for multiple LED lamp strings comprises: the first LED string comprises at least one first LED module which is connected in series through a single first serial connection wire, and the first LED module comprises a first LED chip and a first driving circuit which is electrically connected with the first LED chip respectively; at least one second LED lamp string which comprises at least one second LED module connected in series with each other through a single second serial connection wire, wherein the second LED module respectively comprises a second LED chip and a second driving circuit electrically connected with the second LED chip; a controller electrically connected to the first and second LED strings via the first and second serial lines; the identification resistor is electrically connected to the first or the second serial line and is positioned 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 in sequence and transmit the feedback signal back to the controller through the first and the second serial connection lines, the feedback signal passing through the identification resistor and the feedback signal not passing through the identification resistor have different signal levels, and the controller distinguishes the different light emitting diode modules according to the signal levels.
A control method for a plurality of groups of light-emitting diode lamp strings comprises the following steps: step 1: providing a light emitting diode circuit, which comprises a light emitting diode lamp string group, a controller and an identification resistor, wherein the light emitting diode lamp string group comprises a plurality of light emitting diode lamp strings which are 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 one output end of one light emitting diode module; step 2: the LED modules connected with the on-line respectively output a feedback signal in sequence and return the feedback signal to the controller through the connecting line; and step 3: the feedback signal passing through the identification resistor and the feedback signal not passing through the identification resistor have different signal levels, and the controller distinguishes the different light emitting diode modules according to the signal levels.
The invention uses the setting of the identifying resistance to lead the feedback signal returned by each section of the LED light string to have different signal level, so that the controller can distinguish different LED light strings according to the signal level, thereby giving different signals to different sections of the LED light strings and achieving the specific light-emitting effect. In addition, only the identification resistor needs to be arranged, so the cost is low, the manufacture is convenient, the light emitting variability can be increased under the condition of not greatly increasing the cost, and the distinguishing effect can be achieved even if the LED lamp string is additionally expanded in a serial connection or parallel connection mode.
Drawings
Fig. 1 is a circuit architecture diagram according to an embodiment of the invention.
Fig. 2 is a schematic circuit diagram of the led light string of fig. 1.
FIG. 3 is a circuit architecture diagram according to another embodiment of the present invention.
Detailed Description
The detailed description and technical contents of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic circuit configuration diagram according to an embodiment of the present invention, and fig. 1 illustrates 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, where the led string set 10 includes a plurality of led strings, in this embodiment, the led strings include 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 wire 40, and the led strings are electrically connected to the controller 20 through the string connection wire 40, thereby forming a serial connection relationship. In this embodiment, the first led light string 10a includes four led modules, which are respectively labeled as a-1, a-2, a-3, and a-4, the second led light string 10b includes three led modules, which are respectively labeled as b-1, b-2, and b-3, and the third led light string 10c includes four led modules, which are respectively labeled 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, and 14a, and the led modules 11a, 12a, 13a, and 14a respectively include a led chip 111a, 121a, 131a, and 141a and a driving circuit 112a, 122a, 132a, and 142a, the driving circuit 112a, 122a, 132a, and 142a is connected in series to the serial line 40, and the led chips 111a, 121a, 131a, and 141a are electrically connected to the driving circuit 112a, 122a, 132a, and 142 a. In the present invention, the led module further includes a feedback circuit, for example, the led module 11b further includes a feedback circuit 113b, 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 end 1121b of the driving circuit 112b and a feedback input end 1122b, and the second feedback section 1132b is connected between an input end 1123b of the driving circuit 112b and a feedback output end 1124b, so as to form a feedback path in the led module 11b for the driving circuit 112 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 the present invention, the identification resistor 30 is electrically connected to the serial line 40 and located behind an output terminal of the led module, specifically, the identification resistor 30 is located in the led string, behind the output terminal of the endmost led module, or it can be defined that the identification resistor 30 is located in the led string set and in front of an input terminal of the second led string. As shown in fig. 2, the first identifying resistor 30a is electrically connected to the serial line 40 and located behind the output terminal of the led module 14a (in front of the input terminal 1123b of the led module 11 b).
In operation, the control circuit has a start mode and a detection mode, in the start mode, the controller 20 transmits a start command to the led modules 11a, 12a, 13a, 14a, 11b through the serial connection 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 output a feedback signal to the controller 20 through the feedback path and the serial line 40 in sequence. Since the identification resistor 30 is disposed on the serial line 40, the feedback signal passing through the identification resistor 30 has a different signal level, and the controller 20 can distinguish different led modules according to the signal level. Further, for the feedback signal sequentially returned by the driving circuits 112a, 122a, 132a, 142a through the feedback path and the serial line 40, since the identification resistor is not disposed before the led module 14a, the feedback signal does not pass through the identification resistor; 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 first identification resistor 30a before the led module 11 b. Therefore, the feedback signal received by the controller 20 from the driving circuits 112a, 122a, 132a, 142a has a first signal level, the feedback signal received by the controller 20 from 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 modules 11b corresponding to the second signal level are defined as a second group. In this way, the controller 20 can know the number of the led modules of each led string, so as to provide different signals to different led strings to achieve a specific light emitting effect.
Referring to fig. 3, which is a schematic circuit architecture diagram 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 group 10, a second led string group 50, a third led string group 60, a controller 20, and at least one identification resistor, in this embodiment, the led strings are connected in parallel, for example, the difference between the present embodiment and the above embodiment is that, the first LED string sets 10 are serially connected to each other through a single serial connection line 40a, the second LED strings 50 are serially connected to each other through a single serial connection line 40b, the third led string 60 is serially connected to each other through a single serial connection wire 40c, and the first led string group 10, the second led string 50 and the third led string 60 are connected in parallel to each other. The first led string set 10 includes a plurality of led strings 10a and 10b, the second led string set 50 includes a plurality of led strings 50a, 50b and 50c, and the third led string 60 includes a plurality of led strings 60a and 60 b.
In each light emitting diode light string, the identification resistor is electrically connected behind the output end of the light emitting diode module at the tail end. The first identifying resistor 30a and the second identifying resistor 30b are respectively arranged in the led 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 and 32b are respectively disposed in the led strings 60a and 60 b. In this way, the controller 20 can know the number of the led modules of each led string, so as to provide different signals to different led strings to achieve a specific light emitting effect.
Claims (6)
1. A control circuit of a plurality of groups of light-emitting diode lamp strings is characterized by comprising:
the LED lamp string set comprises a plurality of LED lamp strings which are connected in series with each other through a single serial connection wire, each LED lamp string comprises at least one LED module, and each LED module comprises an LED chip and a driving circuit which is electrically connected with the LED chip;
the controller is electrically connected with the light-emitting diode lamp string group through the serial line; and
at least one identification resistor, which is electrically connected to the serial line and is positioned behind an output end of the light-emitting diode module;
the driving circuit of the LED chip outputs a feedback signal in sequence and returns the feedback signal to the controller through the serial connection line, the feedback signal passing through the identification resistor and the feedback signal 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 light-emitting diode lamp strings is characterized by comprising:
the first LED string comprises at least one first LED module which is connected in series through a single first serial connection wire, and the first LED module comprises a first LED chip and a first driving circuit which is electrically connected with the first LED chip respectively;
at least one second LED lamp string which comprises at least one second LED module connected in series with each other through a single second serial connection wire, wherein the second LED module respectively comprises a second LED chip and a second driving circuit electrically connected with the second LED 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
at least one identification resistor, which is electrically connected to the first serial line or the second serial line and is located 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 return the feedback signal to the controller through the first serial connection line and the second serial connection line, the feedback signal passing through the identification resistor and the feedback signal not passing through the identification resistor have different signal levels, and the controller distinguishes different light emitting diode modules according to the signal levels.
3. A control method for a plurality of groups of light-emitting diode lamp strings is characterized by comprising the following steps:
step 1: providing a light emitting diode circuit, which comprises a light emitting diode lamp string group, a controller and an identification resistor, wherein the light emitting diode lamp string group comprises a plurality of light emitting diode lamp strings which are 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 one output end of one light emitting diode module;
step 2: the LED modules connected with the on-line respectively output a feedback signal in sequence and return the feedback signal to the controller through the connecting line;
and step 3: the feedback signal passing through the identification resistor and the feedback signal not passing through the identification resistor have different signal levels, and the controller distinguishes the different light emitting diode modules according to the signal levels.
4. The method of claim 3, wherein the feedback signal that does not pass through the identifying resistor has a first signal level, the feedback signal that passes through the identifying resistor has a second signal level, the LED modules corresponding to the first signal level are defined as a first group, and the LED modules corresponding to the second signal level are 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 connection line.
6. The control method of claim 3, wherein the LED strings are connected in parallel.
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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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| 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 CN113645732B (en) | 2024-02-09 |
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