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

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 present invention relates to the technical field of transmit-receive frequency conversion channels, especially to a 16-channel digital multi-beam transmit-receive front-end module. The module comprises a receiving antenna, a transmission antenna, a 16-path receiving channel, a 1-path transmission channel, a 3-path test clock module, a 1-path local oscillator module, a heat dissipation module and a power control module. A transmission channel of the 16-path receiving channel is in signal connection with a receiving antenna, the transmission channel is in signal connection with a transmission antenna, the 16-path receiving channel is connected with the heat dissipation module, the local oscillator module is in signal connection with the transmission channel, the power control module supplies power to the transmission channel, the local oscillator module and the 3-path test clock module, the 3-path test clock module and the 1-path local oscillator module are frequency sources, and each structure is in multi-layer three-dimensional hard connection. The high-density integration, the small size, the light weight and the good stability of the Ku waveband multi-channel digital multi-beam transmit-receive front-end module can be achieved to meet multi-aspect requirements of multi-wave transmit-receive test.

The invention provides an output voltage detecting circuit for a frequency changer. The output voltage detecting circuit comprises a high-speed isolation optocoupler, a current-limiting resistor and a shunting resistor, wherein an anode of an input end of the high-speed isolation optocoupler is connected with an output phase line of the frequency changer through the current-limiting resistor, and a cathode of the input end of the high-speed isolation optocoupler is connected with a negative direct current bus of the frequency changer; two ends of the shunting resistor are respectively connected with the anode and the cathode of the input end of the high-speed isolation optocoupler; and an output detection signal of the high-speed isolation optocoupler is transmitted into a main control chip to be processed. The invention further provides the frequency changer comprising the output voltage detecting circuit. The invention realizes the strong electricity isolation through the high-speed isolation optocoupler, and is suitable for the detection of the output voltage of the frequency changer where the main control chip is placed at a weak current side.

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 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 an automatic control method for improving the efficiency of a radio frequency power amplifier. The real-time adjustment of a static operating point of the radio frequency poweramplifier is achieved through the automatic control of a gate-source voltage Vgs of the radio frequency power amplifier, and mixing and low-pass filtering are performed on an input signal and an output signal of the radio frequency power amplifier after performing coupling on the same to obtain a DC signal; an analog-to-digital converter in a single-chip microcontroller collects the voltage information of the DC signal in real time and compares the voltage information with a known ideal value, and the compared difference is provided for the analog-to-digital converter in the single-chip microcontroller for outputting a matched voltage, an output end of the analog-to-digital converter is connected with an inductor L1 and is connected to the grid of the radio frequency power amplifier so asto adjust the gate-source voltage Vgs of the radio frequency power amplifier in real time. By adoption of the automatic control method, the effective balance between additional efficiency and error vector magnitude is achieved. In other words, the additional efficiency is maximized while the output error vector magnitude is guaranteed, and the circuit configuration is extremely streamlined, so that the automatic control method is suitable for wide range application.

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 invention discloses a micro-differential voltage transmitter which comprises a microprocessor, an A/D converter, a D/A converter, an LED, a modem, a keyboard, a memory, a voltage-stablizer, a V/I converting circuit and a power supply, wherein the A/D converter, the D/A converter, the LED, the modem, the keyboard, the memory and the voltage-stablizer are connected with the microprocessor, the input end of the V/I converting circuit is connected with the output end of the D/A converter, and the power supply is connected with the voltage-stablizer and supplies power to the microprocessor. The micro-differential voltage transmitter is simple in integral structure, easy for realization, and low in cost. The micro-differential voltage transmitter is universal and is applicable to the civil field.

The invention relates to a floating buck-boost PFC circuit and an LED driving power supply. The floating buck-boost PFC circuit comprises a filter circuit, a rectifier bridge, a PFC control chip, a voltage sampling circuit and a PFC correction circuit, and the PFC correction circuit comprises a switching tube Q1 and a switching tube Q2 with withstand voltage of 600V-650V, an energy storage inductor T1, a fly-wheel diode D0, a fly-wheel diode D1, an electrolytic capacitor E1 with withstand voltage of 400V-450V, a resistor R0 and a capacitor C1. The LED driving power supply comprises a DC/DC conversion circuit, an LLC control chip, an LED voltage/current sampling circuit and the floating buck-boost PFC circuit. Compared with the traditional PFC circuit, the floating buck-boost PFC circuit provided by the invention has the characteristics of simple circuit, few devices, high conversion efficiency, higher stability and lower product cost.

The invention relates to a fan speed regulation circuit and a multi-path parallel fan speed regulation circuit, and belongs to the technical field of motor control. The multi-path parallel fan speed regulation circuit comprises a primary side drive circuit and at least two speed regulation units, each speed regulation unit comprises an isolator and a secondary side energy storage circuit, whereinthe primary side of each isolator is connected in the primary side drive circuit, the secondary side of each isolator is connected to the corresponding secondary side energy storage circuit, and eachsecondary side energy storage circuit comprises an energy storage capacitor, a switch tube and a bias circuit of the switch tube. According to the fan speed regulation circuit and the multi-path parallel fan speed regulation circuit, more than two speed regulation units are arranged, and the speed regulation units can achieve the speed regulation effect of more than two parallel fans according tothe control of the same primary side drive circuit; and in addition, the multi-path parallel fan speed regulation circuit is simple, few in using devices, less in generated heat loss and capable of saving the hardware cost.

The invention belongs to the calculation holographic three-dimensional display field and particularly relates to a colorful holographic three-dimensional display method based on space division and a system thereof. The system utilizes a CCD camera or a computer graphical method to acquire a multi-perspective two-dimensional image of a colorful target object, through pre-processing transformation, a set of target images suitable for phase type hologram calculation are generated; an iteration Fourier transform algorithm is utilized to calculate corresponding phase type holograms; a single spatial light modulator is divided into red, green and blue sub zones, the sub zones respectively load corresponding red, green and blue component holograms, a hologram diffraction reproduction characteristic is utilized to generate three single-color holographic reproductive images on a reconstruction plane, directional diffraction of pixels of the three reproductive images is carried out to a fixed position to form different view points, multi-perspective colorful reproductive images are acquired, and true colorful three-dimensional display is realized; in combination with a spatial light modulator, rapid refresh loading of the holograms is carried out, and multi-perspective true colorful full-parallax dynamic holographic three-dimensional reproduction is realized.