TWI705217B - Control circuit and control method of multi-group light-emitting diode string - Google Patents

Abstract

A control circuit for multiple groups of light-emitting diodes includes a light-emitting diode string group, a controller, and at least one identification resistor. The light-emitting diode string group includes a plurality of light-emitting diodes connected in series through a single string The diode light string includes at least one light emitting diode module, each including a light emitting diode chip and a driving circuit electrically connected to the light emitting diode chip, and the controller is electrically connected to the light emitting diode Body lamp string group, the identification resistor is electrically connected to the series line and located behind an output terminal of the light emitting diode module. The driving circuit respectively outputs a feedback signal and sends it 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 according to the signal level Different light emitting diode modules.

Description

Control circuit and control method of multi-group light-emitting diode string

The present invention relates to a control circuit and control method of light emitting diodes, in particular to a control circuit and control method of multiple groups of light emitting diodes.

Light-emitting diodes have the characteristics of high luminous efficiency, light weight, and resistance to damage. They have been widely used in the field of daily lighting. With the changes in use requirements, different numbers and colors of light-emitting diodes have been installed in lighting components. It has become the norm, and at the same time, in order to control these light-emitting diodes with different numbers and colors to produce different light-emitting effects, the control circuit is also set in the light-emitting diode circuit.

Among the many application areas, one of them is a light string containing multiple light-emitting diode chips. The light string can be combined in series or parallel to achieve different lighting effects. For example, US Patent Publication No. 10,429,016 discloses a light-emitting diode string with stable current. The light-emitting diode string has a plug, a socket, and a lighting lamp connected between the plug and the socket. String and a control circuit arranged in the plug or the socket. The control circuit uses at least one current controller to stably control the driving current flowing through the light string. When the temperature of the light string exceeds the threshold, the current controller activates the overheating protection function to reduce the driving current; when the lighting string is short-circuited, the current controller activates the short-circuit protection function to reduce the driving current.

In the combined application of multiple light-emitting diode strings, the number of light-emitting diode strings is large. To achieve diversified lighting effects, it is necessary to The polar chips are sequenced. For example, before assembling into a light-emitting diode string, write data of different addresses for each light-emitting diode chip, and place it according to the address corresponding to the data during assembly. Not only method It is complicated, costly, and not very practical; and when it is necessary to expand and connect additional light-emitting diode string or parallel connection, it will not be able to produce special light-emitting effects because the address information is not known.

The main purpose of the present invention is to solve the problem that when multiple sets of conventional light-emitting diode light strings are connected in series or parallel, it is difficult to sequence and produce different lighting effects.

In order to achieve the above objective, the present invention provides a control circuit for multiple groups of light-emitting diode light strings, including: a light-emitting diode light string group, including a plurality of light-emitting diode lights connected in series through a single series wire The light-emitting diode string includes at least one light-emitting diode module, and the light-emitting diode module includes a light-emitting diode chip and a driving circuit electrically connected to the light-emitting diode chip; A controller is electrically connected to the light-emitting diode string group through the series line; and at least one identification resistor is electrically connected to the series line and located behind an output terminal of the light-emitting diode module; wherein, The driving circuit of the light-emitting diode chip sequentially outputs a feedback signal and sends it back to the controller through the series connection. The feedback signal passing through and not passing through the identification resistor has a different signal Level, the controller distinguishes different light emitting diode modules according to the signal level.

A control circuit for multiple groups of light-emitting diode light strings includes: at least one first light-emitting diode light string, including at least one first light-emitting diode module connected in series through a single first series line, The first light-emitting diode module includes a first light-emitting diode chip and a first drive circuit electrically connected to the first light-emitting diode chip; at least one second light-emitting diode string includes At least one second light-emitting diode module connected in series through a single second series line, the second light-emitting diode module each including a second light-emitting diode chip and an electrical connection to the second light-emitting diode The second driving circuit of the diode chip; a controller, which is electrically connected to the first and the second light-emitting diode string through the first and the second series wiring; and at least one identification resistor, which is electrically connected After the first or the second series connection and an output terminal of the first or the second light-emitting diode module; wherein, the first and the second driving circuits respectively output a feedback in sequence The signal is transmitted back to the controller through the first and second series In the controller, the feedback signal passing through and not passing through the identification resistor has a different signal level, and the controller distinguishes the different light emitting diode modules according to the signal level.

A method for controlling multiple groups of light-emitting diode strings includes the following steps: Step 1: Provide a light-emitting diode circuit, including a light-emitting diode string group, a controller, and an identification resistor. The body light string group includes a plurality of light-emitting diode light strings electrically connected to each other by a connecting wire, the controller is electrically connected to the light-emitting diode light string, and the identification resistor is electrically connected to one of the light-emitting diode strings. After an output terminal of the diode module; Step 2: The light-emitting diode modules on the connection line sequentially output a feedback signal and send it back to the controller through the connection 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 light emitting diode modules according to the signal level.

The present invention uses the setting of the identification resistor to allow the feedback signal returned by each segment of the LED string to have a different signal level, so that the controller can distinguish the different signal levels according to the signal level. The light-emitting diode string, so as to give different signals to different segments of the light-emitting diode string, to achieve a specific lighting effect. In addition, since only the identification resistor needs to be provided, the cost is low and the manufacturing is convenient, which can increase the variability of light emission without greatly increasing the cost, and even if the light-emitting diode string is additionally expanded in series or parallel connection, The effect of discrimination can also be achieved.

10: LED string group

10a: The first LED string

10b: The second LED string

10c: The third light-emitting diode string

a-1, a-2, a-3, a-4, b-1, b-2, b-3, c-1, c-2, c-3, c-4: light-emitting diode module

11a, 12a, 13a, 14a, 11b: LED module

111a, 121a, 131a, 141a, 111b: light-emitting diode chip

112a, 122a, 132a, 142a, 112b: drive circuit

1121b: output

1122b: Feedback input

1123b: input

1124b: Feedback output

113b: feedback circuit

1131b: The first feedback section

1132b: Second feedback stage

20: Controller

30, 31a, 31b, 31c, 32a, 32b: identification resistance

30a: first identification resistor

30b: Second identification resistance

30c: Third identification resistor

40, 40a, 40b, 40c: series wiring

50: The second LED string

50a, 50b, 50c: LED string

60: The third light-emitting diode string

60a, 60b: LED string

"Figure 1" is a schematic diagram of a circuit structure according to an embodiment of the present invention.

"Figure 2" is a schematic diagram of the circuit structure of the light-emitting diode string of "Figure 1".

"Figure 3" is a schematic diagram of a circuit structure according to another embodiment of the present invention.

The detailed description and technical content of the present invention will now be described in conjunction with the drawings as follows.

"FIG. 1" is a schematic diagram of a circuit architecture according to an embodiment of the present invention. "FIG. 1" discloses a control circuit of a plurality of sets of LED light strings, including a light-emitting diode string group 10, a controller 20, and At least one identification resistor 30, the LED string group 10 includes a plurality of LED string, in this embodiment, the LED string includes a first LED string 10a, A second light-emitting diode string 10b and a third light-emitting diode string 10c, the first light-emitting diode string 10a, the second light-emitting diode string 10b, and the third light-emitting diode string The body light string 10c is connected in series with each other through a single series line 40, and the LED light string is electrically connected to the controller 20 through the series line 40, thereby forming a series connection. Wherein, the light-emitting diode string includes at least one light-emitting diode module. In this embodiment, the first light-emitting diode string 10a includes four light-emitting diode modules, which are marked as a -1, a-2, a-3, a-4, the second light-emitting diode string 10b includes three light-emitting diode modules, respectively labeled b-1, b-2, b-3, The third light-emitting diode string 10c includes four light-emitting diode modules, which are respectively labeled c-1, c-2, c-3, and c-4.

Please further refer to "Figure 2", the first light emitting diode string 10a includes a plurality of light emitting diode modules 11a, 12a, 13a, 14a, and the light emitting diode modules 11a, 12a, 13a, 14a respectively includes a light-emitting diode chip 111a, 121a, 131a, 141a and a driving circuit 112a, 122a, 132a, 142a, the driving circuit 112a, 122a, 132a, 142a is connected in series to the series line 40, and the light-emitting two The polar body chips 111a, 121a, 131a, and 141a are electrically connected to the driving circuits 112a, 122a, 132a, and 142a. In the present invention, the light-emitting diode module further includes a feedback circuit. Take the light-emitting diode module 11b as an example. The light-emitting diode module 11b further includes a feedback circuit 113b. The circuit 113b is disposed in the light emitting diode module 11b, and includes a first feedback section 1131b and a second feedback section 1132b. The first feedback section 1131b is connected to an output terminal 1121b of the driving circuit 112b and Between a feedback input terminal 1122b, 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 light emitting diode for the driving circuit 112b. The feedback path in the diode module 11b.

As shown in "Figure 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 After the series connection 40 is located at an output end of the light-emitting diode module, specifically, the identification resistor 30 is located in the light-emitting diode string, the end of the light-emitting diode module After the output terminal, or it can be defined that the identification resistor 30 is located in the LED string group, and the second one before the input terminal of the LED string. As shown in "Figure 2", the first identification resistor 30a is electrically connected to the series line 40, and is located behind the output terminal of the light-emitting diode module 14a (the light-emitting diode module 11b) Before input 1123b).

In operation, the control circuit has an activation mode and a detection mode. In the activation mode, the controller 20 transmits an activation command to the LED modules 11a, 12a, 13a, 14a through the serial cable 40 , 11b, control the LED modules 11a, 12a, 13a, 14a, 11b to emit light; and in the detection mode, the driving circuits 112a, 122a, 132a, 142a, 112b will sequentially pass through the feedback path and The series connection 40 outputs a feedback signal to the controller 20. Since the identification resistor 30 is arranged on the series line 40 in the present invention, the feedback signal passing through and not passing through the identification resistor 30 has a different signal level, and the controller 20 can distinguish according to the signal level Different light emitting diode modules. Further, for the feedback signal returned by the driving circuits 112a, 122a, 132a, 142a through the feedback path and the series line 40 in sequence, since there is no prior to the light emitting diode module 14a The identification resistor, so 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 series line 40, because the light-emitting diode module The first identification resistor 30a is provided before 11b, so the feedback signal will pass through the identification resistor. Therefore, the controller 20 receives the feedback signal from the driving circuit 112a, 122a, 132a, and 142a that has a first signal level, and the controller 20 receives the feedback signal from the driving circuit 112b. The signal has a second signal level, the light emitting diode modules 11a, 12a, 13a, 14a corresponding to the first signal level are defined as a first group, and the second signal level corresponds to the light emitting The diode module 11b is defined as a second group. In this way, the controller 20 can know the number of LED modules of each segment of the LED string, so as to give different signals to different segments of the LED string to achieve specific Glowing effect.

Please refer to "FIG. 3", which is a schematic diagram of a circuit structure according to another embodiment of the present invention. The control circuit of the multiple sets of LED light strings disclosed in "FIG. 3" includes a light-emitting diode string group 10, a first Two light-emitting diode light strings 50, a third light-emitting diode light string 60, a controller 20, and at least one identification resistor. In this embodiment, a plurality of light-emitting diode light string groups are connected in parallel with each other as an example. The difference between this embodiment and the above-mentioned embodiment is that the light-emitting diode string group 10 is connected in series through a single series line 40a, and the second light-emitting diode string 50 is connected in series through a single series line 40b. The third light-emitting diode string 60 is connected in series with each other through a single string wire 40c, and the light-emitting diode string group 10, the second light-emitting diode string 50, and the third light-emitting diode light The strings 60 are connected in parallel with each other. The LED string group 10 includes a plurality of LED strings 10a, 10b, and the second LED string group 50 includes a plurality of LED strings 50a, 50b, and 50c. The three-light-emitting diode light string 60 includes a plurality of light-emitting diode light strings 60a, 60b.

In each light-emitting diode string, the identification resistor is electrically connected after the output end of the light-emitting diode module at the end. The first identification resistor 30a and the second identification resistor 30b are respectively arranged in the light-emitting diode string 10a, 10b; the identification resistors 31a, 31b, and 31c are respectively arranged in the light-emitting diode string 50a, 50b, 50c; the identification resistors 32a, 32b are respectively arranged in the light-emitting diode string 60a, 60b. In this way, the controller 20 can know the number of LED modules of each segment of the LED string, so as to give different signals to different segments of the LED string to achieve specific Glowing effect.

10: LED string group

10a: The first LED string

10b: The second LED string

10c: The third light-emitting diode string

a-1, a-2, a-3, a-4, b-1, b-2, b-3, c-1, c-2, c-3, c-4: light-emitting diode module

20: Controller

30: Identification resistance

30a: first identification resistor

30b: Second identification resistance

30c: Third identification resistor

Claims (6)

A control circuit for multiple groups of light-emitting diode string lights, including: A light-emitting diode string group includes a plurality of light-emitting diode light strings connected in series through a single string connection, the light-emitting diode light string includes at least one light-emitting diode module, and the light-emitting diode The body modules respectively include a light emitting diode chip and a driving circuit electrically connected to the light emitting diode chip; A controller electrically connected to the light-emitting diode string group through the series cable; and At least one identification resistor, electrically connected to the series line and located behind an output terminal of the light emitting diode module; Wherein, the driving circuit of the light-emitting diode chip sequentially outputs a feedback signal and transmits it back to the controller through the series connection. The feedback signal passing through and not passing through the identification resistor has different A signal level, and the controller distinguishes different light emitting diode modules according to the signal level. A control circuit for multiple groups of light-emitting diode string lights, including: At least one first light-emitting diode string includes at least one first light-emitting diode module connected to each other in series through a single first series wire, and the first light-emitting diode module includes a first light-emitting two A pole body chip and a first driving circuit electrically connected to the first light emitting diode chip; At least one second light-emitting diode string includes at least one second light-emitting diode module connected to each other in series through a single second series wire, and the second light-emitting diode modules respectively include a second light-emitting two A pole body chip and a second driving circuit electrically connected to the second light emitting diode chip; A controller which is electrically connected to the first and the second light-emitting diode string through the first and the second series wiring; and At least one identification resistor, electrically connected to the first or the second series wire and located behind an output terminal of the first or the second light emitting diode module; Wherein, the first and the second driving circuit respectively output a feedback signal in sequence and return it to the controller through the first and the second series wiring, the feedback signal passing and not passing the identification resistor It has a different signal level, and the controller distinguishes different light-emitting diode modules according to the signal level. A method for controlling multiple groups of light-emitting diode string lights includes the following steps: Step 1: Provide a light-emitting diode circuit, including a light-emitting diode string group, a controller, and an identification resistor. The light-emitting diode string group includes a plurality of light-emitting diodes electrically connected to each other by a connecting wire The diode light string, the controller is electrically connected to the light emitting diode light string, and the identification resistor is electrically connected behind an output terminal of one of the light emitting diode modules; Step 2: The light-emitting diode modules on the connecting line sequentially output a feedback signal and send it 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 control method according to claim 3, wherein the feedback signal that has not passed the identification resistance has a first signal level, the feedback signal that has passed the identification resistance has a second signal level, and The light emitting diode module corresponding to the first signal level is defined as a first group, and the light emitting diode module corresponding to the second signal level is defined as a second group. The control method according to claim 3, wherein the light-emitting diode string is connected in series with each other in a single series line. The control method according to claim 3, wherein the light-emitting diode string is connected in parallel with each other.

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