3results about How to "Guaranteed output power" patented technology

The utility model discloses a tablet personal computer structure with four groups of loudspeakers, which comprises a frame and a support, four sound outlets are arranged on the frame, a first flat cable is electrically connected onto the frame, the frame is sleeved on the outer side of the support, a circuit board is mounted on the support, the first flat cable is electrically connected with the circuit board, four mounting grooves are arranged on the support, and the four mounting grooves are communicated with the first flat cable. A second flat cable is arranged in the mounting groove, the second flat cable is electrically connected with the circuit board, an audio mechanism is mounted in the mounting groove and comprises a loudspeaker and a contact block, the loudspeaker and the contact block are both connected with the mounting groove, the loudspeaker is electrically connected with the circuit board, the contact block is electrically contacted with the second flat cable, one end of the contact block penetrates through the sound outlet, and the other end of the contact block is electrically connected with the circuit board. A first frame amount is arranged between the contact block and the sound outlet. According to the tablet computer structure with the four groups of loudspeakers, the loudspeakers shielded by the hands of a user are turned off, and meanwhile, the audio output function of the loudspeakers which are not shielded is kept, so that the overall sound effect quality of equipment is guaranteed.

The invention relates to the technical field of semiconductor lasers, in particular to an external cavity grating ring-added ultra-narrow linewidth laser, which comprises a laser gain chip; the low-light-energy-loss BRAGG grating optical waveguide is arranged on the right side of the laser gain chip and is in coupling butt joint with the laser gain chip; the low-light-energy-loss annular resonant optical waveguide is arranged on the front side of the low-light-energy-loss BRAGG grating optical waveguide; the left end of the laser gain chip is provided with a high reflection (HR) film, and the right end of the laser gain chip is provided with an anti-reflection (AR) film. According to the invention, a laser architecture design is formed by three units of a laser gain chip, a low-light-energy-loss BRAGG grating optical waveguide and a low-light-energy-loss annular resonant optical waveguide, and a filtering and ultra-narrow linewidth feedback structure unit is formed by close-range coupling of the low-light-energy-loss BRAGG grating optical waveguide and the low-light-energy-loss annular resonant optical waveguide.

This invention discloses a scalable power very low frequency (VLF) transmitter device and its control method. It consists of multiple individual cabinets, with multiple units sharing a single main control system, facilitating expansion and allowing for power level adjustments, improved waveform quality, and reduced output waveform harmonics. The input terminals of multiple individual power cabinets can be connected in parallel to DC or AC power supplies, and the output terminals are connected in series to the load. Each cabinet includes a switching module, a voltage conversion module, an adjustable voltage module, multiple switching signal modules, multiple multi-tap high-frequency transformers, and a corresponding number of bypass switches. The unique design of the switching signal modules facilitates online expansion and replacement. The high-frequency transformers are multi-tap high-frequency transformers; adjusting the tap positions allows for graded adjustable output voltage after multiple units are connected in parallel. The main control system includes a command control unit, a stepped waveform generation and expansion unit, a storage unit, and a communication unit. The main control system can multiply the comparison value and pulse quantity based on the individual unit comparison value using interpolation methods to provide pulse signals to the switching signal modules.