32results about How to "Use less devices" patented technology

The invention provides a magneto-optical switch. The magneto-optical switch comprises a single-fiber collimator, a first birefringent crystal, a first half-wave plate component, an optical rotation component, a second half-wave plate component, a second birefringent crystal and a dual-fiber collimator which are sequentially arranged in the optical path direction, wherein the optical rotation component is provided with a refractor; a first Faraday optical rotation piece is arranged on the side of the refractor close to the first half-wave plate component; an optical rotation device is arranged on the side of the refractor close to the second half-wave plate component; the optical rotation component is further provided with a magnetic field producer positioned outside the first Faraday optical rotation piece; the single-fiber collimator is a single-core beam-expanding fiber collimator with a beam-expanding optical fiber mounted therein; and the dual-fiber collimator is a dual-core beam-expanding fiber collimator with two beam-expanding optical fibers mounted therein. The magneto-optical switch provided by the invention adopts smaller devices, and the birefringent crystals and the optical rotation component are both small in size, so that the size of the magneto-optical switch is reduced and the manufacturing cost of the magneto-optical switch is lowered.

The embodiment of the invention discloses a synchronous dual-frequency receiving system. The system comprises: a dual-frequency radio frequency signal generating device, a first mixer, a second mixer, a first phase shifter, a second phase shifter, a first filtering device, a second filtering device, a four-port circulator and a dual-frequency local oscillation signal generating device, wherein the first mixer and the second mixer are used for mixing a radio frequency signal with a local oscillation signal; the first phase shifter and the second phase shifter are used for changing a phase of an input signal by an angle; the first filtering device and the second filtering device are used for filtering the input signal to obtain a signal with a required frequency; the four-port circulator is used for adding and subtracting two input signals to perform signal separation; the dual-frequency radio frequency signal generating device is used for generating a dual-frequency radio frequency signal; and the dual-frequency local oscillation signal generating device is used for generating a dual-frequency local oscillation signal. By applying the embodiment of the invention, the cost and the size of the synchronous dual-frequency receiving system can be reduced.

The invention discloses an MMC topological structure with direct current fault removing capability. Each phase comprises an upper bridge arm and a lower bridge arm; each bridge arm comprises a numberof half bridge submodules and bridge arm reactors that are connected in series, a first transistor and a fourth transistor are respectively connected to two ends of each bridge arm, a first diode is reversely connected in parallel between an emitting electrode and a collector electrode of the first transistor, a fourth diode is reversely connected in parallel between an emitting electrode and a collector electrode of a fourth transistor, an anode of a second diode is connected to the emitting diode of the fourth transistor, a cathode of the second diode is connected to the emitting diode of the first transistor, an anode of a third diode is connected to the collector electrode of the fourth transistor, and a cathode of a third diode is connected to the collector electrode of the first transistor. The MMC topological structure disclosed in the invention can help correct deficiencies of technologies of the prior art, fault currents can be rapidly cleared, and fast reclosing can be easilyrealized.

The invention relates to an off-axis reflective optical antenna comprising a housing, an off-axis parabolic mirror arranged inside the housing, and a fiber interface arranged at one end of the housing. The fiber interface is arranged at a focal point of the off-axis parabolic mirror; and the fiber interface is used for transmitting or receiving signal light and then carrying out transmission. Compared with the prior art, the off-axis reflective optical antenna has the following advantages: a few of devices are used by the antenna; the fiber interface is arranged at the focal point of the off-axis parabolic mirror directly, so that installation and debugging becomes simple and convenient; with the off-axis parabolic mirror and the off-axis collimating and coupling way, the coupling efficiency is high; and the antenna has the same optical path for light of different wave bands, so that the adverse effect on the alignment debugging by the chromatic aberration of different wavelengths can be avoided.

The present invention relates to the technical field of transceiver frequency conversion channels, specifically a 16-channel digital multi-beam transceiver front-end assembly, including a receiving antenna, a transmitting antenna, 16 receiving channels, 1 transmitting channel, 3 test clock modules, and 1 local oscillator module , heat dissipation module and power control module; 16 receiving channels and transmitting channels are connected to receiving antenna signals, transmitting channels are connected to transmitting antenna signals, 16 receiving channels are connected to heat dissipation modules, local oscillator modules are connected to transmitting channel signals, and power control modules are respectively connected to The transmission channel, 1-way local oscillator module and 3-way test clock module are powered, the 3-way test clock module and 1-way local oscillator module are frequency sources, and each structure is a multi-layer three-dimensional hard connection. Realized the high-density integration of Ku-band multi-channel digital multi-beam transceiver front-end components, small size, light weight, good stability, and met the multi-faceted requirements of multi-beam transceiver testing.

The invention provides a charging circuit and a charging method. The charging circuit comprises a direct current constant voltage source, a first switching tube, a second resistor, an inductor, a current transformer, a voltage detection apparatus, a supercapacitor, a second switching tube and a controller, wherein the controller generates a first path of pulse to control the switch on or switch off of the first switching tube and generates a second path of pulse to control the switch on or switch off of the second switching tube, according to the charging current of the supercapacitor obtained by the current transformer and the voltage at the two ends of the supercapacitor obtained by the voltage detection apparatus. By adoption of the embodiment of the charging circuit, the supercapacitor is charged in an RLC constant-voltage charging mode; the first switching tube and the second switching tube are triggered by adopting complementary pulses to realize charging control on the supercapacitor; and the charging circuit shares two switching tubes, so that the number of adopted devices is small.

The invention discloses a non-ground voltage measuring device and method. By placing a metal plate between the wire to be measured and a virtual ground, the voltage of the wire to be measured is compared with the equivalent capacitance of the wire to be measured and the virtual ground of the metal plate. The corresponding relationship is established, and then the voltage signal representing the corresponding relationship is modulated by a high-frequency signal and frequency-divided to calculate the voltage of the wire to be tested. It can be seen that the measuring device of the present application uses a virtual ground for voltage measurement and calculation without the need for insulation design; moreover, the measuring device of the present application uses fewer devices, is smaller in size, is easy to assemble and disassemble, and has higher construction safety, thereby meeting the requirements of The development needs of smart grid.

The invention relates to a single-polarization type annular all-fiber current sensor and a detection method thereof. The sensor comprises a light source, a first single polarization coupler, a second single polarization coupler, a first sensing fiber ring, a second sensing fiber ring and a photoelectric detector; one port in the double-port side of the first single polarization coupler is connected with the light source via a fiber, the single-port side of the first single polarization coupler is connected with the single-port side of the second single polarization coupler, one port of the double-port side of the second single polarization coupler is connected to the other port of the double-port side of the first single polarization coupler via the first and second sensing fiber rings successively, and the other port of the double-port side of the second single polarization coupler is connected with the photoelectric detector via a fiber; and both the first and second sensing fiber rings are wound around the same electrified conductor, and a winding structure of the first sensing fiber ring and a winding structure of the second sensing fiber ring are in mirror symmetry. The sensor is simple in structure, includes fewer devices, has high resistance to external interference, and has low requirements for the stability of the light source and connection devices.

The present disclosure provides a method and device for controlling a brake motor, and a vehicle, so as to solve the problem of insufficient control precision of a brake motor in the related art. The method includes: in response to the brake pedal position information currently detected by the vehicle, generating a reference PWM control amount for basic braking control of the brake motor of the target wheel; judging whether the current actual slip ratio of the target wheel is at Within the range of the ideal slip ratio; if the current actual slip ratio of the target wheel is not within the range of the ideal slip ratio, generate an anti-lock braking control for the brake motor of the target wheel Dead PWM control amount; set the ratio of the base PWM control amount and the anti-lock PWM control amount, and generate a target PWM control amount according to the ratio; control the target wheel based on the target PWM control amount The brake motor works.

The invention discloses a state latch circuit, which includes a sampling module, a state latch module, and a control module; the sampling module includes a first sampling input terminal and a second sampling input terminal, and the first sampling input terminal is used for connecting a test circuit The first sampling point, the second sampling input is used to connect the second sampling point of the test circuit, the output of the sampling module is connected to the input of the state latch module, the output of the state latch module The terminal is connected to the input terminal of the control module, and the output of the control module controls the test circuit. The invention can monitor the change of the voltage signal in real time, and control and protect the test equipment.

The airbag-driven trailer translational lifting control system and control method of the present invention include a signal acquisition unit, an airbag drive unit and a controller unit, the signal acquisition unit includes a proximity switch, a sensing area and an attitude sensor, and the airbag drive unit includes three Position two-way valve, opening valve and pneumatic latch, the proximity switch collects the chassis position signal through the sensing area and transmits the electrical command to the controller unit, the controller unit controls the action of the pneumatic latch according to the electrical command and then controls the inflation and deflation of the airbag The sensor collects the tilt angle information of the trailer chassis and sends it to the controller unit. The controller unit controls the action of the three-position two-way valve and the opening valve according to the obtained chassis tilt angle information to control the inflation and deflation rate. The invention adopts the control air bag to inflate and deflate to carry out the loading and unloading process, and the lifting is stable. Due to the cushioning performance of the air bag, the trailer can also effectively reduce the damage to the transport vehicle caused by vehicle bumps during the transportation process.

The invention belongs to the field of computer-generated holography and three-dimensional display, and particularly relates to a time-division multiplexing-based color holographic three-dimensional display method and system. By the display system, a multi-view two-dimensional image of a color target object is obtained by a method of CCD camera or computer graphics; a group of target images suitable for phase-type hologram calculation are generated after a preprocessing transformation process; a corresponding phase-type hologram is calculated by an iterative Fourier transform algorithm and is loaded to a spatial light modulator in a time-division manner; a synchronization control circuit controls red, green and blue three-color light sources to synchronously display in sequence; and three monochromatic holographic reconstructed images are generated on a reconstruction plane in a time-division manner, and corresponding reconstructed image pixels are directionally diffracted to the position at which a pixel-type nano grating is fixed to form different viewpoints, thereby obtaining multi-view color reconstructed images and achieving true color three-dimensional display. The hologram is quickly refreshed and loaded by combining the spatial light modulator, so that the multi-view real color full-parallax dynamic holographic three-dimensional reconstruction of the target object is achieved.

The invention discloses a current-to-voltage conversion circuit with input bias and active power filtering effects and a current-to-voltage conversion method. The current-to-voltage conversion circuit with the input bias and active power filtering effects comprises an operational amplifier A1 and a bias current source; after being in parallel connection with the bias current source, a current signal (Is) is connected to a reverse input end of the operational amplifier A1; a forward input end of the operational amplifier A1 is connected with the ground; an output end of the operational amplifier A1 is connected with a reverse input end of the operational amplifier A1 through a capacitor C1 and is connected to a parallel-connection node between the bias current source and the current signal (Is) through a negative feedback resistor R3; and the node is in parallel connection with a capacitor C2 in a grounding manner. Input bias is implemented through the current source, active power filtering and current-to-voltage conversion are implemented through the operational amplifier, the circuit is simple, the cost is low, and the application prospect is high.