Please select the most similar patent number from A, B, C and D. Which number is?
An electromagnetic charge-sensitive electric mosquito swatter, comprising a charging-discharging circuit (1), a boost circuit (3) and a central control circuit (4). The charging-discharging circuit (1) provides required power to the boost circuit (3). Also comprised are an electromagnetic charge space scanning circuit (5) and a gate circuit (6); the gate circuit (6) is bridged between the electromagnetic charge space scanning circuit (5) and the central control circuit (4) so that when the electromagnetic charge space scanning circuit (5) senses a holding signal of a human hand holding the swatter, the holding signal is converted into a startup signal by means of the gate circuit (6) and is transmitted to the central control circuit (4); and the central control circuit (4) drives the charging-discharging circuit (1) to provide power to the boost circuit (3). The present mosquito swatter has the advantages of being convenient and safe to use and being effective in shocking mosquitos.
A: A working control circuit of an ultrasonic atomizing sheet and an ultrasonic electronic cigarette, the working control circuit comprising a power supply module (1), a boosting circuit (2), a smoking switch (3), a controller (4), a driving circuit (7), and an LC oscillation circuit (5); an output end of the boosting circuit (2) is further connected to the driving circuit (7) by means of a voltage regulating circuit (6); the voltage regulating circuit (6) comprises a first MOS transistor, a first resistor and a second resistor; a reference level feedback end of the boosting circuit (2) is grounded by means of a third resistor, while a voltage output end of the boosting circuit (2) is connected to the reference level feedback end of the boosting circuit by means of a fourth resistor; a gate of the first MOS transistor and an end of the second resistor are both connected to an output end of the controller (4), a drain of the first MOS transistor is connected to the voltage output end of the boosting circuit (2) by means of the first resistor, and a source of the first MOS transistor is connected between the third resistor and the fourth resistor, the other end of the second resistor being grounded. The ultrasonic atomizing sheet has a fast start-up speed, a long service life, a stable amount of smoke, low usage costs, and good user experience.
B: An anti-electric shock electric mosquito swatter having a conductive plastic electrode mesh, comprising a mosquito swatter body (1), a power mesh assembly (2) and a protective mesh; the mosquito swatter body (1) comprises a handle (11), a hand grip (12) and a swatter frame (13), the hand grip (12) is provided with an inner cavity (122) for installing a power supply control circuit (121) and a battery; the power mesh assembly (2) consists of a positive electrode portion and a negative electrode portion, the positive electrode portion comprises several strips of positive electrode conductors (21) and positive electrode conductive connectors (22), the negative electrode portion comprises several strips of negative electrode conductors (23) and negative electrode conductive connectors (24), the several strips of positive electrode conductors (21) and the several strips of negative electrode conductors (23) are distributed in the swatter frame (13) in a staggered manner at intervals so as to form an electrode mesh of an electrostatic field for intercepting and attracting mosquitoes; and the protective mesh comprises an upper protective mesh (3) provided on one side of the swatter frame (13) and a lower protective mesh (4) provided on the other side of the swatter frame, the upper protective mesh (3) and the lower protective mesh (4) are respectively provided on two sides of the power mesh assembly (2), and fixed on the swatter frame (13). The mosquito swatter has a simple structure, is easy to manufacture, and is formed into an integrated structure.
C: A shift register, a gate drive circuit, and a gate drive method. The shift register comprises: a display pre-charging reset circuit (3), a sensing control circuit (1), a sensing pre-charging reset circuit (2), a pull-down control circuit (4), a display noise reduction circuit (5), and an output circuit. The sensing control circuit (1) and the sensing pre-charging reset circuit (2) are connected to a sensing control node. The display pre-charging reset circuit (3), the sensing pre-charging reset circuit (2), the pull-down control circuit (4), and the output circuit are connected to a pull-up node (PU). The pull-down control circuit (4), the display noise reduction circuit (5), and the output circuit are connected to a pull-down node (PD). The output circuit is configured to have one or more signal output terminals (OUT), and comprises one or more output sub-circuits (6) provided in one-to-one correspondence with the signal output terminals (OUT). The display pre-charging reset circuit (3) is connected to a first signal input terminal (STU1), a second signal input terminal (STU2), a first scan power supply terminal (D), and a second scan power supply terminal (R), and is configured to write, in response to control of the first signal input terminal (STU1), a first scan voltage provided by the first scan power supply terminal (D) to the pull-up node (PU), and to write, in response to control of the second signal input terminal (STU2), a second scan voltage provided by the second scan power supply terminal (R) to the pull-up node (PU). The display noise reduction circuit (5) is connected to the first signal input terminal (STU1), the second signal input terminal (STU2), the first scan power supply terminal (D), and the second scan power supply terminal (R), and is configured to write, in response to control of the first signal input terminal (STU1), the second scan voltage to the pull-down node (PD), and to write, in response to control of the second signal input terminal (STU2), the first scan voltage to the pull-down node (PD).
D: Disclosed are a DC voltage conversion circuit, a DC voltage conversion method and a liquid crystal display device. The circuit comprises: a boost circuit 1, a charge pump circuit 2, and a control circuit 3; the control circuit is additionally provided with a first current detection module 201, a second current detection module 202, and an AND gate Y1; a first current I1 in the boost circuit 1 is detected by means of the first current detection module 201, and a high level or a low level is supplied to a first input end of the AND gate Y1 according to the magnitude of the first current I1; a second current I2 in the charge pump circuit 2 is detected by means of the second current detection module 202, and a high level or a low level is supplied to a second input end of the AND gate Y1 according to the magnitude of the second current I2; when the first current I1 is relatively small and the second current I2is relatively large, namely the boost circuit 1 is at a light load and the charge pump circuit 2 is at a heavy load, a level at the output end of the AND gate Y1 is used to control a switch module 301 to increase the switch frequency of the switch module 301, so that the normal work of the charge pump circuit 2 is ensured, and the stability of the VGH voltage is improved.
Answer: B