11 results about "Direct digital control" patented technology

The invention discloses an FPGA (Field Programmable Gate Array) implementation method of a DVB (Digital Video Broadcasting) high-speed demodulator. A digital signal enters a parallel DDC (Direct Digital Control) module and is re-adapted to multiple symbol rates; the parallel AGC module adjusts the power of the digital signal to a fixed power value; the method comprises the following steps: passing through Oamp; m algorithm: completing symbol synchronization; related peaks are extracted, and frame synchronization is completed; correcting the frequency to enable the frequency to reach participation frequency deviation; performing frequency compensation on the digital signal after loop filtering; after error information is calculated and filtered, the digital signal is compensated; and restoring the original information of the digital signal. According to the invention, by adopting the parallel processing module, the real-time performance and the parallelism degree of digital signal processing can be greatly improved, and the performance of the whole demodulator is enhanced. Each module is designed to be adaptive to the change of a digital signal, for example, the AGC module can dynamically adjust the power of the digital signal to ensure that the output digital signal is always kept at a fixed power level so as to adapt to different receiving conditions.

This invention discloses a vector modulation active phase shifter, comprising a coupling network (100) for generating quadrature signals, a first active amplitude control module (200) and a second active amplitude control module (300) composed of a common-source cascode transistor array for adjusting the gain of in-phase and quadrature signals, and a power combining and output matching network (400). The vector modulation active phase shifter includes a phase compensation network (500) located between the coupling network for generating quadrature signals and the active amplitude control module, used to optimize the phase bandwidth of the quadrature signals and improve phase shift accuracy. This invention realizes a wideband, high-precision, directly digitally controlled vector combining active phase shifter with a 360° phase shift range.

An integrated purification device and method for dust and acidic gas in a gas extraction pipeline comprises: a cyclone-type primary dust collector, comprising a lower box, a conical cylinder, a primary dust collector air inlet duct, a cylinder, and a primary dust collector exhaust duct; a dust removal and explosion-proof integrated self-excited dust collector, comprising a liquid storage tank, a secondary dust collector air inlet duct, a secondary dust collector exhaust duct, a guide plate, and an explosion-proof throttle plate; a dust exhaust box; an induced draft fan; and a direct digital controller. The present invention can effectively remove dust and acidic, toxic, and harmful gases in the extracted gas, prevent corrosion of dust deposition pipelines and extraction pipelines, effectively avoid the transmission of explosions, and promptly depressurize the pipelines during explosions to avoid harm to surrounding workers.

The present application provides a control method and device based on the Hongmeng system, including: a direct digital controller receives a detection message from a first device; the direct digital controller generates a control message according to the detection message; the direct digital controller sends the control message to a second device; the direct digital controller receives a result message from the second device; the direct digital controller sends the result message to a third device; the direct digital controller receives a determination message from the third device, and displays the result message according to the determination message; or the direct digital controller receives an adjustment instruction from the third device, and sends the adjustment instruction to the second device; the direct digital controller receives a feedback message from the second device, and sends the feedback message to the third device. The present application achieves the beneficial effect of improving control efficiency and ensuring the control effect of environmental conditions.

The invention discloses a wireless configuration system and method of a DDC device based on NFC, and relates to the technical field of wireless communication, and the wireless configuration system comprises a DDC device and a mobile terminal carrying NFC. Wherein the DDC device is used for reading a communication key and a parameter to be configured; initializing a module corresponding to each parameter to be configured; updating configuration information of each module according to configuration parameters written by the mobile terminal through NFC communication; the mobile terminal is used for establishing communication connection with the DDC device through NFC; scanning, identifying and verifying the communication key; and after the verification is passed, the to-be-configured parameters are read, and corresponding configuration data are written into the DDC device through NFC communication. Through the NFC technology, a wireless, simple, convenient and direct DDC device configuration scheme which is free of electromagnetic interference and does not need to carry other equipment additionally is realized.

An energy recovery system used with HVAC and Air-Conditioning units that is incorporated into a roof-curb, final filter curb assembly or base support structure (roof-curb air plenum) commonly used with mass produced standard or semi-custom manufactured air conditioning systems. The arrangement includes core or wheel type energy recovery media arranged and affixed within the curb or support base in an orientation and method to maximize the amount of energy recovery surface area installed in a minimum area while still allowing good airflow practices. Other items included may be filter racks preceding where air enters the energy recovery cores, a singular or multiple fan(s) to move the air, a condensate drain pan, and a preheat coil or bypass dampers which operate to prevent frosting of the energy recovery surface areas in cold conditions. A direct digital controller may also be included to maximize efficiency and control.

The invention discloses integrated purification equipment and method for dust and acid gas in a gas extraction pipeline, and the equipment comprises a cyclone type primary dust remover which comprises a lower box body, a conical cylinder, a primary dust remover gas inlet pipeline, a cylinder and a primary dust remover gas exhaust pipeline; the dust removal and explosion prevention integrated self-excitation dust remover comprises a liquid storage tank, a secondary dust remover air inlet pipeline, a secondary dust remover air outlet pipeline, a flow guide plate and an explosion prevention throttling plate, a dust discharge box; an induced draft fan; a direct digital controller; dust and acid poisonous and harmful gas in extracted gas can be effectively removed, corrosion of dust deposition pipelines and extraction pipelines is prevented, explosion transmission is effectively avoided, pressure relief of the pipelines during explosion is carried out in time, and harm to surrounding operators is avoided.

A powerful direct digital control (DDC) and integration control platform that is scalable and easy to use and meet building owners and contractors' desires for a highly secure and robust technical solution. One may combine heating, ventilation and air conditioning (HVAC) DDC control with the embedded workstation platform, and DDC controllers with embedded workstation platform software design. An embedded workstation platform event-driven approach (such as a Windows operating system (OS) or Unix OS environment) is not necessarily easily suited to real-time common in HVAC DDC control. The present system may solve an issue of combining high-power event needs for HVAC DDC Controls.

This invention discloses a multifunctional integrated power metering training device and its simulation method, belonging to the technical field of power system training equipment. It includes a main control cabinet and an operation panel area. The main control cabinet adopts a double-layer steel frame structure, housing an 8300D power source, current transformer, voltage transformer, and industrial control computer. The 8300D power source, based on virtual load digital power supply technology, achieves high-precision power output through computer software programmable control to simulate the metering environment of a real power field. The operation panel area includes a meter installation and connection panel area and a simulation test panel area. The meter installation and connection panel area is equipped with a power meter and a perforated plate; the perforated plate supports installation and wiring training. The simulation test panel area is equipped with a miswiring operation area and an anti-theft metering operation area. This solution organically integrates modular design, intelligent innovation, and direct digital control technology into the power metering training device, achieving high reliability, scalability, and intelligent fault handling capabilities.

A system, for measurement of temperatures and detection of faults of parallel transformers in a DDC enclosure, that includes a first transformer and a second transformer arranged in a parallel configuration that deliver power to components of a building management system (BMS). The system also includes a direct digital control (DDC) circuit that controls power delivered through the first and the second transformers to the components of the building management system (BMS). The system further includes a first temperature sensor, operationally connected to the DDC circuit, which measures the temperature of the first transformer. Furthermore, the system includes a second temperature sensor, operationally connected to the DDC circuit, which measures the temperature of the second transformer. The DDC circuit determines a difference between the first temperature and the second temperature to predict a fault in the first transformer or the second transformer.