55results about How to "Increase output gain" patented technology

A flat-plate MIMO array antenna includes a substrate, a plurality of antenna elements disposed on the substrate, and at least one isolation element interposed between a plurality of antenna elements on the substrate and connected to a ground. Mutual interference between the antenna elements is prevented by the isolation element formed between the antenna elements, thereby preventing the distortion of the radiation pattern. Also, since the isolation element is grounded to the ground surface, the isolation element operates as a parasitic antenna, thereby increasing the output gain.

An active clamping high-gain alternate parallel voltage boosting convertor disclosed by the invention comprises two power switching diodes, two output diodes, two clamping diodes, two auxiliary power switching diodes, two clamping capacitors, two switching capacitors, an output capacitor and two coupling inductors. Two coupling inductors respectively comprise two windings. The present invention uses the second winding of two coupling inductors and two switching capacitors to realize the high-gain output of the convertor. With the leakage inductance of two coupling inductors, two clamping capacitors, the shunt capacitor existing in two power switching diodes themselves and the gate arrangement of two power switching diodes and two auxiliary power switching diodes, the zero voltage switching-on and zero voltage switching-off of two power switching diodes and two clamping diodes are realized. The soft switching-off of two output diodes and two clamping diodes are realized with the leakage inductance of two coupling inductors, and the circuit does not include energy losing element and the output gain of the convertor and the circuit efficiency can be increased.

The invention discloses a single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation. The converter comprises a single-phase Booster circuit unit working in an input current continuous mode, a transformer voltage doubling circuit unit and an output circuit unit which are connected in turn, wherein the single-phase Booster circuit unit working in the input current continuous mode consists of an input filtering inductor, two power switching tubes, a parallel capacitor and a clamping capacitor; the transformer voltage doubling circuit unit consists of a transformer provided with two windings, a blocking capacitor, a voltage doubling capacitor and a freewheel diode; the output circuit unit consists of an output diode and an output capacitor; and an output circuit is connected with a load. The converter has the advantages of realizing zero voltage switch-on and switch-off of a first power switching tube and a second power switching tube, and reducing input current ripple along with simple circuit structure, convenient control and suitability for high efficiency conversion occasions of solar energy distributed power generation.

A photo, acoustic detector (200) for detecting a concentration of a sample in a sample mixture. The photo acoustic detector (200) comprises a light source (101 ) for producing a light beam for exciting molecules of the sample and a light modulator (102) for modulating the light beam for generating pressure variations in the sample mixture, an amplitude of the pressure variations being a measure of the concentration. The photo acoustic detector (200) further comprises a detector element (103) for converting the pressure variations into a detector current and a processing section (106) for processing the detector current to generate an output signal representing the concentration. The processing section (106) comprises an integrating amplifier for integrating the detector current, the integrating amplifier being coupled to the detector element (103) via a hold switch, and a timing circuit for generating a hold signal, SW_HOLD, for operating the hold switch in order to couple the integrating amplifier to the detector element (103) during a predetermined interval of a period of the detector current.

The invention discloses a sound receiving system. Output ends of a plurality of basic array devices are connected with filters respectively, output ends of a plurality of filters are connected with an input end of a second sound mixing output device, each of the basic array devices comprises a microphone array which comprises a plurality of microphones, the plurality of microphones are longitudinally arranged sequentially along a straight line, the spacing distance between two adjacent microphones is as follows, an output end of each of the microphones is connected with a time-delay circuit respectively, output ends of a plurality of time-delay circuits are connected with an input end of a first sound mixing output device, and the delay time of the i time-delay circuit is the sum of the delay time of the last time-delay circuit and (n-i) times of the unit time. By the aid of the sound receiving system, within the set frequency bandwidth, the output gain which can improve positive acoustic wave excitation can be achieved, the output gain of non-positive acoustic waves can be greatly restrained, and required directivity characteristics can be obtained. The sound receiving system is widely used in the pickup (sound transmission) field.

The invention provides a gamma source inverter based on a switch capacitor and a modulation method, belonging to the technical field of inverters. The problem that the boosting capability of a Z-source inverter in the prior art is limited by straight-through ratio and modulation degree, and when the inverter is started, large resonance current is generated to cause the damage of the device. The gamma source inverter comprises a three-phase inverter, an output filter and a gamma source network module based on the switch capacitor; and the voltage output by a direct-current power supply Vdc is sequentially subjected to spatial voltage modulation by the gamma source network module based on the switch capacitor, the voltage inversion by the three-phase inverter and the filtering by the outputfilter, and a reference voltage vector Uout is output, the direct-current power supply Vdc is boosted, and power is supplied to the load. The inverter is mainly applied to a new energy power supply system.

An isolated type active clamping interlaced parallel connection AC-AC converter disclosed by the invention comprises two power switch tubes, two output diodes, two clamping diodes, one auxiliary power switch tube, one clamping capacitance, two switch capacitances, one output capacitance and two flyback transformers. The two flyback transformers respectively have two windings. The invention uses a second winding of two flyback transformers and two switch capacitances to realize improvement of the transformer output power grade. The leakage inductance energy of two flyback transformers are absorbed only using one auxiliary switch tube and one clamping capacitance, the zero voltage switch on and off of two power switch tubes and two auxiliary switch tubes are realized using the arrangement of shunt capacitances existing by the two power switch tubes selves and gates of two power switch tubes and two auxiliary switch tubes, soft switch off of the two output diodes and the two clamping diodes are realized by leakage inductances of the two flyback transformers, energy consumption elements are not existed in the circuit, thereby improving the output gain of the converter and the circuit efficiency.

The invention discloses an acoustic receiving device which comprises a microphone array, delay circuits and a mix output device. The sensor microphone comprises a plurality of microphones. The microphones are linearly, sequentially and longitudinally arrayed. Spacing distance of each two adjacent microphones in the microphone array is 1/n*Lambada<0>. An output end of each microphone in the microphone array is connected with one delay circuit. An output end of every delay circuit is connected with an input end of the mix output device. Delay time of the i-th delay circuit is the sum of the delay time of the last delay circuit and (n-i) times of a unit time. The acoustic receiving device can increase excited output gain of positive acoustic wave and greatly suppress output gain of non-positive acoustic wave in a certain range of frequency bandwidth. In addition, the acoustic receiving device can acquire approximate directional characteristics in the range of central frequency and adjacent frequencies. The acoustic receiving device is widely applicable to the field of pick-up (sound bearing).

The invention discloses a mixed discrete-type high-nonlinearity optical fiber amplifier based on a double-feedback structure, and the amplifier comprises a plurality of light transmitters, a laser, an optical signal combiner, an Er-doped fiber, an optical signal divider, a plurality of light receivers, a first isolator, a second isolator, a first coupler, a second coupler, a first circulator, a second circulator, a polarized wave combiner, a control unit, a high-nonlinearity optical fiber, a fiber bragg grating, and a plurality of groups of pump light. A feedback ring structure is formed between the first circulator and the first coupler, and a feedback ring structure is formed between the second circulator and the first and second couplers. The first isolator is connected between the optical signal combiner and the first coupler, and the second isolator is connected between the fiber bragg grating and the optical signal divider. The amplifier is advantageous in that the utilization rate of pump power is high, the mutual interference between the pump light and signal light at front and back stages is small, the control effect is good, the raman gain coefficient is high, the integration degree is higher, and the small-scale design is facilitated better.

The invention relates to a beam domain coherent azimuth estimation method based on fluctuated phase alignment. The method is implemented on the basis of a long-line sonar array formed by M equidistant hydrophones. The method includes the first step of conducting frequency point accumulative division on broadband array element domain signals received by the sonar array to obtain array element domain signals of single frequency points, the second step of obtaining direction guidance vectors of incoming wave signals of the sonar array, the third step of converting the array element domain signals of the single frequency points into a beam domain according to the obtained direction guidance vectors, the fourth step of conducting fluctuation coherent processing on the beam domain signals, and the fifth step of calculating a beam output energy power value of the beam domain signals subjected to fluctuation coherent processing and then realizing estimation of target azimuth. The beam domain coherent azimuth estimation method based on fluctuated phase alignment effectively improves the suppression effect of output gain and strong interference of the signals and has excellent spatial resolving capability.

The invention discloses a perimeter security radar transverse crossing target detection method and system, a medium and equipment, which belong to the technical field of radar detection, and are usedfor solving the technical problem that the existing perimeter security radar cannot effectively detect a transverse crossing target. The method comprises the steps of 1) obtaining an angle-Doppler matrix of each array element in a current coherent processing interval; 2) according to the angle-Doppler matrix, calculating a radial speed estimation value and a target angle estimation value of the target; 3) constructing a virtual array according to the radial speed estimation value and the target angle estimation value of the target, and 4) performing target detection on the virtual array. The method has the advantages that the transverse crossing target is effectively and accurately detected, vegetation clutters can be effectively suppressed, and the like.

The invention discloses high-efficiency spectrum resource sensing equipment. The high-efficiency spectrum resource sensing equipment comprises a sensing antenna, a band-pass filter, a square-law detector, an integrator and a decision device which are sequentially connected in series; the sensing antenna comprises a high gain antenna body, a low gain antenna body and a conversion device; and both the high gain antenna body and the low gain antenna body are coupled with the band-pass filter through the conversion device and controlled by the conversion device to be connected or disconnected withthe band-pass filter, the conversion device is provided with a control end, the control end is coupled with the decision device, and when the control end receives a communication signal output by thedecision device, the conversion device connects the high gain antenna body with the band-pass filter. According to the high-efficiency spectrum resource sensing equipment, by arranging the high gainantenna body, the low gain antenna body and the conversion device, the high gain can be efficiently used in the communication process, and therefore the communication quality is well guaranteed.