Please select the most similar patent number from A, B, C and D. Which number is?
A smart filament light structure, comprising a stem (1), an antenna (2), a signal transmitting/receiving module (3), and a driver board (4). The stem (1) comprises a shoulder part (11) and a button (12). The shoulder part (11) of the stem (1) is provided with multiple first lead wires (111). The button (12) of the stem (1) is provided with a second lead wire (121). Light filaments (5) are provided between the first lead wires (111) and the second lead wire (121). A connecting lead wire (13) is provided on the stem (1) to form a circuit loop. One end of the connecting lead wire (13) is connected to one of the first lead wires (111); the other end of the connecting lead wire (13) forms a first connecting end (131). A second connecting end (14) connected to the second lead wire (121) is led out from the stem (1). One end of the antenna (2) protrudes the shoulder part (11) of the stem (1); the other end of the antenna (2) forms a third connecting end (21). The signal transmitting/receiving module (3) is connected to the third connecting end (21). The driver board (4) is connected to the first connecting end (131) and the second connecting end (14), a current flows in via the first connecting end (131), then runs through the light filament (5), and then flows out from the second connecting end (14). As such, implemented are the antenna (2) not being susceptible to interference and shielding, structural simplicity, and increased use effects of the filament light.
A: A control circuit and a display device. The control circuit comprises a timing control panel (1) and a printed circuit board (3). The timing control panel comprises a first connecting terminal (11), a switch (12), and an operating circuit. The first connecting terminal (11) is connected to a control end (121) of the switch (12), a first voltage (V1) is available at an input end (22) of the switch (12), and an output end (123) of the switch (12) is connected to the operating circuit. The printed circuit board (3) comprises a second connecting terminal (31), a third connecting terminal (32), and a fourth connecting terminal (33) that are arranged in sequence. The voltage on the third connecting terminal (32) is different from the voltage on the second connecting terminal (31) and the voltage on the fourth connecting terminal (33). The first connecting terminal (11) is electrically connected to any one of the second connecting terminal (31), the third connecting terminal (32), and the fourth connecting terminal (33). When the first connecting terminal (11) is connected to the third connecting terminal (32), the switch is turned on. When the first connecting terminal (11) is connected to the second connecting terminal (31) or the fourth connecting terminal (33), the switch is turned off. By means of the control circuit, the burnout of an operating circuit caused by inserting a connector slantwise is avoided.
B: A hair curling apparatus with a far infrared function, comprising a rod head (1) and a main machine (2), the rod head (1) and the main machine (2) having a plug connection by means of the four mutually engaging pairs of a first connecting end (J1), a second connecting end (J2), a third connecting end (J3), and a fourth connecting end (J4); a power source circuit (20) and a control circuit (21) are arranged in the main machine (2), and a heating element (10), a temperature measurement element (11), and an LED far infrared light-emitting group (12) are arranged in the rod head (1); the two ends of the heating element (10) are respectively electrically connected to the power source circuit (20) and the control circuit (21) by means of the first connecting end (J1) and the second connecting end (J2); one end of the temperature measurement element (11) is connected to the control circuit (21) by means of the third connecting end (J3), and the other end is grounded by means of the fourth connecting end (J4); one end of the LED far infrared light-emitting group (12) is connected to the power source circuit (20) by means of the first connecting end (J1), and the other end is grounded by means of the fourth connecting end (J4). There is no need to add new circuit connection points for the LED far infrared light-emitting group (12), and the working state of the LED far infrared light-emitting group (12) is not affected by the operation of the heating element (10), enabling the main machine to be compatible with rod heads of traditional curling rods; use is convenient, and production costs are reduced.
C: A test probe (20) of a detection apparatus. The test probe comprises a probe sheath (10) and the probe (20). The probe sheath (10) comprises a first connecting end (11), a second connecting end (12) and a connecting lead (13). The connecting lead (13) is flexibly connected between the first connecting end (11) and the second connecting end (12). The probe (20) is inserted on the second connecting end (12). The first connecting end (11) is welded onto a test PCB board (30) and forms a first signal connection area on that position. Other signal connection areas are provided on the test PCB board (30). Since the connection lead (13) is flexibly connected between the first connecting end (11) and the second connecting end (12), when the probe is inserted on the second connecting end (12), the probe (20) can be inserted into the test PCB board (30) from other signal connection areas and from a long distance and with a large span, thereby completing a test task for a functional module on a test board under the test PCB board (30).
D: An LED filament lamp is provided, comprising a bulb, a supporting rod, at least two power cables, and at least two LED filament bars. Each LED filament bar comprises a substrate, an LED chip disposed on the substrate, and an electrode plate fixed to two ends of the substrate. One end of the electrode plate is electrically connected to the LED chip on the substrate, and the other end thereof is electrically connected to the electrode plate of another LED filament bar or to one end of a power cable, such that the LED filament bar and the at least two power cables form an electrically connected structure. One end of the supporting rod is fixed to the bulb, and the other end thereof is connected to at least one LED filament bar so as to support the LED filament bar. The supporting rod of the LED filament lamp of the present invention replaces a stem and a metal wire of an existing LED filament lamp, and the electrode plates of the LED filament bars are directly electrically connected to each other in an inventive manner, such that the LED filament lamp has the advantages of a highly reliable structure and a simple production process.
Answer: D