A device for automatically regulating the output voltage for Christmas lights

Abstract

A device for automatically regulating the output voltage for Christmas lights, characterized in that it comprises a housing, a regulation and control device, and a lithium battery, wherein the lithium battery is arranged in the housing, the regulation and control device is arranged in the inner upper part of the housing and is electrically connected to the lithium battery via lines. Two output interfaces for connecting Christmas light chains are arranged symmetrically at one end of the housing in order to supply the Christmas light chains with electrical energy, wherein the output interfaces are connected to the regulation and control device via lines. The output voltage is automatically regulated by the regulation and control device in order to adapt the output voltage of the output interfaces for different Christmas lights.

Description

Technical areas

[0001] The present invention relates to the technical field of control units for Christmas lights, in particular to a device for automatically regulating the output voltage for Christmas lights. State of the art

[0002] In Western countries, people decorate Christmas trees during the holiday season, with Christmas lights being, of course, the most common and important decoration. Almost every Christmas tree is adorned with sparkling Christmas lights, whose glow and flashing are primarily controlled by control units. Typically, one control unit is used per Christmas light string, which is usually powered by an AC adapter or a battery.

[0003] However, due to the lack of uniform voltage standards for Christmas lights on the market - the voltages of most products are between 3 and 30 volts - problems often arise during use: If the power supply is defective, a replacement part may not provide the correct voltage, or if the power supply is lost, the required voltage for a new power supply or a suitable mobile power supply is often unknown;

[0004] The invention aims to provide a device for automatically regulating the output voltage for Christmas lights. Subject of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the previous technology and to provide a device for automatically regulating the output voltage for Christmas lights.

[0006] To solve the above-mentioned technical problem, the present invention provides a technical solution in the form of a device for automatically regulating the output voltage for Christmas lights. The device comprises a housing, a control and regulation device, and a lithium battery. The lithium battery is arranged in the housing, the control and regulation device is arranged in the inner upper part of the housing and is electrically connected to the lithium battery via lines. At one end of the housing, two output interfaces for connecting Christmas light chains are arranged symmetrically to supply the Christmas light chains with electrical energy. The output interfaces are connected to the control and regulation device via lines.The output voltage is automatically regulated by the control and regulation device in order to adapt the output voltage of the output interfaces for different Christmas lights.

[0007] As an improvement, the regulation and control device comprises a circuit board, a charging circuit, a voltage regulation circuit, a control circuit, a switch button, a regulation button and a protection circuit, wherein the charging circuit, the voltage regulation circuit, the control circuit, the switch button, the regulation button and the protection circuit are all arranged on the circuit board; the charging circuit is connected to the lithium battery via cables; the voltage regulation circuit is electrically connected to the switch button, the regulation button and the output interface for the Christmas light chain, and the charging circuit is connected to the voltage regulation circuit and control circuit; the switch button and the control button protrude from the housing; a TYPE-C socket and an infrared receiver are arranged on the circuit board; the infrared receiver is connected to the charging circuit; Both the TYPE-C socket and the infrared receiver protrude from the top of the housing.

[0008] As an improvement, the charging circuit includes a charging MCU, an inductor L1, capacitors C1, C2, C3, a pin P1 and resistors R1, R2, R3, R4, R6 and R7, whereby the charging MCU, the Inductance L1, capacitors C1, C2, C3, pin P1 and resistors R1, R2, R3, R4, R6 and R7 are soldered on the circuit board; the resistors R3 and R7 are connected in series, the resistors R2 and R4 and the pin P1 are connected in parallel and then connected in series with the series connection of R3 and R7, the capacitor C3 is connected in parallel with the series connection of R3 and R7 and is connected to the charging MCU; the charging MCU, the inductance L1 and the resistor R1 are connected in series and then electrically connected to the lithium battery; the capacitors C1 and C2 are connected in series and then in parallel with the resistor R1; the resistor R6 is connected in series with the charging MCU.

[0009] As an improvement, the voltage regulation circuit includes a boost converter chip U2, an inductor L2, transistors Q1, Q2, diodes D1, D4, D5, capacitors C6, C7, C8, C9, C10, and resistors R11, R12, R13, R14, R15, R17, and R18, wherein the boost converter chip U2, the inductor L2, the transistors Q1, Q2, the diodes D1, D4, D5, the capacitors C6, C7, C8, C9, C10, and the resistors R11, R12, R13, R14, R15, R17, and R18 are all soldered on the circuit board; the capacitor C6, the inductor L2, the diode D1, the resistors R12, R13, R14, and the capacitor C10 are connected in series; the resistors R18, capacitors C7, C8 and C9 are all connected in parallel to the aforementioned series circuit; one end of the boost converter chip U2 is connected between the inductor L2 and the capacitor C6; a pin of the boost converter chip U2 is connected between the diode D1 and the inductor L2, a pin of the boost converter chip U2 is connected between the resistors R12 and R13; a pin of the boost converter chip U2 is connected between the capacitors C6 and C7; the diode D5 is connected between the capacitors C9 and C10; one end of the resistor R15 is connected between the resistor R14 and the capacitor C10, another end of the resistor R15 is connected to the output interface for the Christmas light string; the diode D4 and the transistors Q1, Q2 are connected in series and finally connected in parallel to both ends of the capacitor C6; one end of the resistor R11 is connected to the transistor Q1 and the other end is connected between the transistors Q1 and Q2; one end of the resistor R17 is connected to the transistor Q3 and the other end is electrically connected to the switch button; the inputs of the boost converter chip U2 are each connected to the lithium battery and the TYPE-C socket.

[0010] As an improvement, the control circuit includes transistors Q3, Q4, Q5, Q6, resistors R23, R24, R25, R29, R27, R28, R33, a capacitor C12, diodes D2, D3, an LED light 1, an LED light 1, an ADC module and a pin P3, wherein the transistors Q3, Q4, Q5, Q6, resistors R23, R24, R25, R29, R27, R28, R33, the capacitor C12, the diodes D2, D3, the LED light 1, the LED light 1, the ADC module and the pin P3 are all soldered on the circuit board.

[0011] Transistors Q3, Q4, Q5, Q6 form a full bridge circuit to control different waveforms for different flashing modes of the lights, with one end of resistor R27 connected in series with LED light 1 and the other end connected to Q5; one end of resistor R28 is connected in series with LED 2 and the other end is connected to Q6, one end of both LED light 1 and LED light 2 is connected to the charging MCU, the resistors R27, R33 and the capacitor C12 are connected in series and then between the transistors Q5 and Q6, the ADC module is connected between the resistor R27 and the capacitor C12 to detect the current and output the voltage according to the different currents, one end of the resistor R24 is connected to the transistor Q3 and the other end is connected between the transistors Q4 and Q6, one end of the resistor R25 is connected to the transistor Q4 and the other end is connected between the transistors Q3 and Q5, the two ends of pin P3 are connected between transistors Q3 and Q4 and between transistors Q5 and Q6, the diode D2 and the resistor R23 are connected in series, then the aforementioned circuit is connected to pin P3, and the diode D3 is connected in parallel to D3.

[0012] As an improvement, an LED light group is arranged on the circuit board to indicate the current light mode.

[0013] As an improvement, a mode indicator circuit is arranged on the circuit board, wherein the mode indicator circuit is connected to the charging MCU to detect and control the output voltage and the charging state based on feedback from the charging, voltage regulation, control circuit and the infrared receiver.

[0014] As an improvement, the protection circuit includes two resistors R22 and R26 connected in series, with the voltage being divided by the resistors R22 and R26 to protect the lithium battery.

[0015] As an improvement, the housing comprises an upper housing part and a lower housing part, wherein the lower end of the upper housing part is locked to the upper end of the lower housing part; wherein the symmetrical slots are arranged at the front end of the upper housing part; the output interface for the Christmas light chain is arranged in the slots; the regulating and control device is arranged in the inner upper part of the upper housing part; the lithium battery is located in the inner lower part of the housing.

[0016] As an improvement, an end cap is arranged at one end of the upper housing part, wherein the end cap is arranged outside the output interface for the Christmas light chain and is locked to the upper housing part and the lower housing part.

[0017] Advantages of the present invention over the prior art are: The ADC module of the control circuit of this regulation and control device can detect the current value in the circuit and then adjust the output voltage value through a voltage regulation circuit. This adjusts the voltage output from the output interface for the Christmas light string to the required voltage of the connected Christmas light string. This enables the appropriate electrical power to be provided for the Christmas lights and allows adaptive adjustment of the output voltage, which is suitable for Christmas light strings with different voltages on the market. Thus, in the event of a defect or loss of the Christmas light string's power supply, a replacement can be easily found.

[0018] A lithium battery is also installed internally, with the inputs of the boost converter chip U2 connected to the lithium battery and the USB-C port, respectively. This allows the Christmas lights to be powered by the lithium battery when an external power supply is unavailable, and by the external power supply when an external power supply is available. The output voltage is adjusted to the required voltage via a voltage regulation circuit, allowing for convenient use. Description of the drawings Fig. shows the front view of the device for automatically regulating the output voltage for the Christmas lights according to the present invention. Fig. shows the perspective structural diagram of the device for automatically regulating the output voltage for the Christmas lights according to the present invention. Fig. shows the perspective structural diagram 1 of the device for automatically regulating the output voltage for the Christmas lights in the disassembled state according to the present invention. Fig. shows the perspective structural representation 2 of the device for automatically regulating the output voltage for the Christmas lights in the disassembled state according to the present invention. Fig. shows the perspective structural diagram of the circuit board of the device for automatically regulating the output voltage for the Christmas lights according to the present invention. Fig. shows the section view AA from Fig. . Fig. shows the circuit diagram of the printed circuit board of the device for automatic regulation of the output voltage for the Christmas lights according to the present invention. List of reference symbols

[0019] As shown in the pictures: 1, Upper case; 2, Lower case; 3, End cap; 4, Lithium battery; 5, Slot; 6, Christmas light string output interface; 7, Circuit board; 8, Charging circuit; 9, Carrying handle; 10, Voltage regulation circuit; 11, Control circuit; 12, Switch button; 13, Regulation button; 14, Protection circuit; 15, TYPE-C socket; 16, Infrared receiver; 17, Mode display circuit; 18, LED light group. Examples of implementation

[0020] In the following, the device for automatically regulating the output voltage for the Christmas lights according to the present invention will be explained in detail with reference to the attached figures.

[0021] With reference to the Fig.The device for automatically regulating the output voltage for the Christmas lights comprises a housing, a regulation and control device, and a lithium battery (4), wherein the lithium battery (4) is arranged in the housing, the regulation and control device is arranged in the inner upper part of the housing and is electrically connected to the lithium battery (4) via lines. Two output interfaces (6) for connecting Christmas light chains are arranged symmetrically at one end of the housing in order to supply the Christmas light chains with electrical energy, wherein the output interfaces (6) are connected to the regulation and control device via lines. The output voltage is automatically regulated by the regulation and control device in order to adapt the output voltage of the output interfaces (6) for different Christmas lights.

[0022] The regulation and control device comprises a printed circuit board (7), a charging circuit (8), a voltage regulation circuit (10), a control circuit (11), a switch button (12), a regulation button (13) and a protection circuit (14), wherein the charging circuit (8), the voltage regulation circuit (10), the control circuit (11), the switch button (12), the regulation button (13) and the protection circuit (14) are all arranged on the printed circuit board (7), the charging circuit (8) is connected to the lithium battery (4) via cables, the voltage regulation circuit (10) is electrically connected to the switch button (12), the regulation button (13) and the output interface (6) for the Christmas light chain and the charging circuit (8) is connected to the voltage regulation circuit (10) and control circuit (11); wherein the switch button (12) and the control button (13) protrude from the housing; and wherein a TYPE-C socket (15) and an infrared receiver (16) are arranged on the circuit board (7), the infrared receiver (16) is connected to the charging circuit (8) and both the TYPE-C socket (15) and the infrared receiver (16) protrude from the upper housing part.

[0023] The charging circuit includes a charging MCU, an inductor L1, capacitors C1, C2, C3, a pin P1 and resistors R1, R2, R3, R4, R6 and R7 , wherein the charging MCU, the inductance L1, the capacitors C1, C2, C3, the pin P1 and the resistors R1, R2, R3, R4, R6 and R7 are soldered on the circuit board (7);

[0024] The resistors R3 and R7 are connected in series, the resistors R2 and R4 and the pin P1 are connected in parallel and then connected in series with the series connection of R3 and R7, the capacitor C3 is connected in parallel with the series connection of R3 and R7 and is connected to the charging MCU, the charging MCU, the inductance L1 and the resistor R1 are connected in series and then electrically connected to the lithium battery, the capacitors C1 and C2 are connected in series and then connected in parallel to the resistor R1, and resistor R6 is connected in series with the charging MCU.

[0025] Specifically, the charging MCU detects the voltage of the lithium battery (4) and outputs a voltage of 4.2 V to charge the lithium battery (4). The output current is adjusted according to the different voltages of the lithium battery (4): Pre-charging: less than 300 mA, Constant current phase (CC): 2A, Constant voltage phase (CV): maximum 2 A, whereby the current is reduced during operation as the voltage of the lithium battery (4) increases.

[0026] The voltage regulation circuit comprises a boost converter chip U2, an inductor L2, transistors Q1, Q2, diodes D1, D4, D5, capacitors C6, C7, C8, C9, C10 and resistors R11, R12, R13, R14, R15, R17 and R18, wherein the boost converter chip U2, the inductor L2, the transistors Q1, Q2, the diodes D1, D4, D5, the capacitors C6, C7, C8, C9, C10 and the resistors R11, R12, R13, R14, R15, R17 and R18 are all soldered on the circuit board (7);

[0027] The capacitor C6, the inductor L2, the diode D1, the resistors R12, R13, R14 and the capacitor C10 are connected in series, with the resistors R18, capacitors C7, C8 and C9 all connected in parallel to the aforementioned series circuit; one end of the boost converter chip U2 is connected between the inductor L2 and the capacitor C6; one pin of the boost converter chip U2 is connected between the diode D1 and the inductor L2, another pin of the boost converter chip U2 is connected between the resistors R12 and R13; the diode D5 is connected between the capacitors C9 and C10; one end of the resistor R15 is connected between the resistor R14 and the capacitor C10, another end of the resistor R15 is connected to the output interface (6) for the Christmas light chain; the diode D4 and the transistors Q1, Q2 are connected in series and finally connected in parallel to both ends of the capacitor C6; one end of the resistor R11 is connected to the transistor Q1 and the other end is connected between the transistors Q1 and Q2; one end of the resistor R17 is connected to the transistor Q3 and the other end is electrically connected to the switch button (12).

[0028] The inputs of the boost converter chip U2 are connected to the lithium battery and the USB-C port, respectively. This allows the Christmas lights to be powered by the lithium battery when an external power supply is unavailable, and by the external power supply when an external power supply is available. The output voltage is adjusted according to the PWM of the boost converter chip U2.

[0029] The control circuit (11) comprises transistors Q3, Q4, Q5, Q6, resistors R23, R24, R25, R29, R27, R28, R33, a capacitor C12, diodes D2, D3, an LED lamp 1, an LED lamp 1, an ADC module and a pin P3, wherein the transistors Q3, Q4, Q5, Q6, the resistors R23, R24, R25, R29, R27, R28, R33, the capacitor C12, the diodes D2, D3, the LED lamp 1, the LED lamp 1, the ADC module and the pin P3 are all soldered on the circuit board (7).

[0030] Transistors Q3, Q4, Q5, Q6 form a full bridge circuit to control different waveforms for different flashing modes of the lights, with one end of resistor R27 connected in series with LED light 1 and the other end connected to Q5; one end of resistor R28 is connected in series with LED 2 and the other end is connected to Q6; one end of both LED light 1 and LED light 2 is connected to the charging MCU; the resistors R27, R33 and the capacitor C12 are connected in series and then between the transistors Q5 and Q6; the ADC module is connected between the resistor R27 and the capacitor C12 to detect the current and output the voltage according to different currents; one end of the resistor R24 is connected to the transistor Q3 and the other end between connected to transistors Q4 and Q6; one end of the resistor R25 is connected to the transistor Q4 and the other end is connected between the transistors Q3 and Q5; the two ends of pin P3 are connected between transistors Q3 and Q4 and between transistors Q5 and Q6, respectively; the diode D2 and the resistor R23 are connected in series; then the aforementioned circuit is connected to pin P3; and the diode D3 is connected in parallel to D3.

[0031] An LED light group (18) is arranged on the circuit board (7) to display the current light mode.

[0032] A mode display circuit (17) is arranged on the circuit board (7), wherein the mode display circuit (17) is connected to the charging MCU in order to detect and control the output voltage and the charging state based on feedback from the charging circuit (8), voltage regulation circuit (10), control circuit (11) and the infrared receiver (16).

[0033] The housing comprises an upper housing part (1) and a lower housing part (2), wherein the lower end of the upper housing part (1) is locked to the upper end of the lower housing part (3); the symmetrical slots (5) are arranged at the front end of the upper housing part (1); the output interface (6) for the Christmas light chain is arranged in the slots (5); the regulating and control device is arranged in the inner upper part of the upper housing part (1); the lithium battery (4) is arranged in the inner lower housing part (2).

[0034] On the lower housing part (2), away from the end cap (3), a carrying handle 9 is arranged, which facilitates hanging or holding the product;

[0035] Waterproof stickers are arranged on the upper housing part (1), above the infrared receiver (16), the control circuit (11) and the switch button (12).

[0036] An end cap (3) is arranged at one end of the upper housing part (1), wherein the end cap (3) is arranged outside the output interface (6) for the Christmas light chain and is locked to the upper housing part (1) and the lower housing part (2).

[0037] The present invention and one of its embodiments have been described above. This description does not limit the claimed subject matter of the respective claim. The embodiment illustrated in the attached figures represents merely one of several possible embodiments of the invention, and the actual structure is not limited thereto. In summary, structural forms and embodiments similar to the present technical solution, which a person skilled in the art can devise without inventive step using the teachings of the present invention, fall within the scope of the present invention, provided they remain within the scope of this inventive concept.

Claims

[1] A device for automatically regulating the output voltage for Christmas lights, characterized by that: it comprises a housing, a regulation and control device and a lithium battery, wherein the lithium battery is arranged in the housing, the regulation and control device is arranged in the inner upper part of the housing and is electrically connected to the lithium battery via lines. Two output interfaces for connecting Christmas light chains are arranged symmetrically at one end of the housing in order to supply the Christmas light chains with electrical energy, wherein the output interfaces are connected to the regulation and control device via lines. The output voltage is automatically regulated by the regulation and control device in order to adapt the output voltage of the output interfaces for different Christmas lights. [2] A device for automatically regulating the output voltage for Christmas lights according to claim 1, characterized by , that: the regulation and control device comprises a circuit board, a charging circuit, a voltage regulation circuit, a control circuit, a switch button, a regulation button and a protection circuit, wherein the charging circuit, the voltage regulation circuit, the control circuit, the switch button, the regulation button and the protection circuit are all arranged on the circuit board; the charging circuit is connected to the lithium battery via cables; the voltage regulation circuit is electrically connected to the switch button, the regulation button and the output interface for the Christmas light chain, and the charging circuit is connected to the voltage regulation circuit and control circuit; the switch button and the control button protrude from the housing; a TYPE-C socket and an infrared receiver are arranged on the circuit board; the infrared receiver is connected to the charging circuit; Both the TYPE-C socket and the infrared receiver protrude from the upper part of the housing. [3] A device for automatically regulating the output voltage for Christmas lights according to claim 2, characterized by , that: the charging circuit comprises a charging MCU, an inductor L1, capacitors C1, C2, C3, a pin P1 and resistors R1, R2, R3, R4, R6 and R7, wherein the charging MCU, the inductor L1, the capacitors C1, C2, C3, the pin P1 and the resistors R1, R2, R3, R4, R6 and R7 are soldered on the circuit board; the resistors R3 and R7 are connected in series, the resistors R2 and R4 and the pin P1 are connected in parallel and then connected in series with the series connection of R3 and R7, the capacitor C3 is connected in parallel to the series circuit of R3 and R7 and is connected to the charging MCU; the charging MCU, the inductance L1 and the resistor R1 are connected in series and then electrically connected to the lithium battery; the capacitors C1 and C2 are connected in series and then in parallel with the resistor R1; the resistor R6 is connected in series with the charging MCU. [4] A device for automatically regulating the output voltage for Christmas lights according to claim 2, characterized by , that: the voltage regulation circuit comprises a boost converter chip U2, an inductor L2, transistors Q1, Q2, diodes D1, D4, D5, capacitors C6, C7, C8, C9, C10 and resistors R11, R12, R13, R14, R15, R17 and R18, wherein the boost converter chip U2, the inductor L2, the transistors Q1, Q2, the diodes D1, D4, D5, the capacitors C6, C7, C8, C9, C10 and the resistors R11, R12, R13, R14, R15, R17 and R18 are all soldered on the circuit board; the , the resistors R12, R13, R14 and the capacitor C10 are connected in series; the resistors R18, capacitors C7, C8 and C9 are all connected in parallel to the aforementioned series circuit; one end of the boost converter chip U2 is connected between the inductor L2 and the capacitor C6; a pin of the boost converter chip U2 is connected between the diode D1 and the inductance L2, a pin of the boost converter chip U2 is connected between resistors R12 and R13; a pin of the boost converter chip U2 is connected between the capacitors C6 and C7; the diode D5 is connected between the capacitors C9 and C10; one end of the resistor R15 is connected between the resistor R14 and the capacitor C10, another end of the resistor R15 is connected to the output interface for the Christmas light string; the diode D4 and the transistors Q1, Q2 are connected in series and finally connected in parallel to both ends of the capacitor C6; one end of the resistor R11 is connected to the transistor Q1 and the other end is connected between the transistors Q1 and Q2; one end of the resistor R17 is connected to the transistor Q3 and the other end is electrically connected to the switch button; the inputs of the boost converter chip U2 are each connected to the lithium battery and the TYPE-C socket. [5] A device for automatically regulating the output voltage for Christmas lights according to claim 3, characterized by , that: the control circuit transistors Q3, Q4, Q5, Q6, resistors R23, R24, R25, R29, R27, R28, R33, a capacitor C12, diodes D2, D3, an LED light 1, an LED light 1, an ADC module and comprises a pin P3, wherein the transistors Q3, Q4, Q5, Q6, the resistors R23, R24, R25, R29, R27, R28, R33, the capacitor C12, the diodes D2, D3, the LED light 1, the LED light 1, the ADC module and the pin P3 are all soldered on the circuit board; the transistors Q3, Q4, Q5, Q6 form a full-bridge circuit for controlling different waveforms for different flashing modes of the lights; one end of resistor R27 is connected in series with LED 1 and the other end is connected to Q5; one end of resistor R28 is connected in series with LED 2 and the other end is connected to Q6; one end of both LED light 1 and LED light 2 is connected to the charging MCU; the resistors R27, R33 and the capacitor C12 are connected in series and then between the transistors Q5 and Q6; the ADC module is connected between the resistor R27 and the capacitor C12 to detect the current and output the voltage according to the different currents, one end of the resistor R24 is connected to the transistor Q3 and the other end is connected between the transistors Q4 and Q6; one end of the resistor R25 is connected to the transistor Q4 and the other end is connected between the transistors Q3 and Q5; the two ends of pin P3 are connected between transistors Q3 and Q4 and between transistors Q5 and Q6, respectively; the diode D2 and the resistor R23 are connected in series; then the aforementioned circuit is connected to pin P3; the diode D3 is connected in parallel to D3. [6] A device for automatically regulating the output voltage for Christmas lights according to claim 5, characterized by , that: An LED light group is arranged on the circuit board to indicate the current light mode. [7] A device for automatically regulating the output voltage for Christmas lights according to claim 3, characterized by , that: a mode indicator circuit is arranged on the circuit board, wherein the mode indicator circuit is connected to the charging MCU to determine based on feedback from the charging, voltage regulation, Control circuit and infrared receiver to detect and control the output voltage and charge level. [8] A device for automatically regulating the output voltage for Christmas lights according to claim 3, characterized by , that: the protection circuit comprises two resistors R22 and R26 connected in series, whereby the voltage is divided by the resistors R22 and R26 to protect the lithium battery. [9] A device for automatically regulating the output voltage for Christmas lights according to claim 1, characterized by , that: the housing comprises an upper housing part and a lower housing part, wherein the lower end of the upper housing part is locked to the upper end of the lower housing part; the symmetrical slots are located at the front end of the upper housing part; the output interface for the Christmas light chain is arranged in the slots; the regulating and control device is arranged in the inner upper part of the upper housing part; the lithium battery is located in the inner lower part of the housing. [10] A device for automatically regulating the output voltage for Christmas lights according to claim 9, characterized by , that: an end cap is arranged at one end of the upper housing part, wherein the end cap is arranged outside the output interface for the Christmas light chain and is locked to the upper housing part and the lower housing part.

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