46results about How to "Control voltage" patented technology

The invention discloses a novel interlaced bidirectional constant-voltage low-power-consumption temperature measurement system which is mainly composed of a temperature acquisition circuit, a signal conversion circuit and a differential amplifier circuit. The novel interlaced bidirectional constant-voltage low-power-consumption temperature measurement system is characterized in that an interlaced bidirectional control circuit, a constant-current constant-voltage control circuit and a beam excitation type logic amplifying circuit are further connected to the output end of the temperature acquisition circuit and the output end of the signal conversion circuit in series, wherein the constant-current constant-voltage control circuit is connected with the output end of the interlaced bidirectional control circuit, and the beam excitation type logic amplifying circuit is connected with the interlaced bidirectional control circuit and the constant-current constant-voltage control circuit. According to the novel interlaced bidirectional constant-voltage low-power-consumption temperature measurement system, the constant-current constant-voltage control circuit is additionally arranged, so the stability of the working current and the working voltage of the system in the using process can be ensured, and the accuracy and stability of measured data can be improved remarkably.

The field-effect transistor (TET) includes fin type channel, source electrode, drain electrode, solid contact window, gate dielectric layer (DL), and gate electrode. Source and drain electrodes are connected to two ends of the fin type channel. Being positioned at one side of fin channel, solid contact window through wire connect the channel. Gate dielectric layer covers surface of fin channel. Being positioned at the other side of fin channel, gate electrode crosses over the channel. Method for preparing TET includes steps: forming insulating layer and semiconductor layer, patterning semiconductor layer to form T channel; at same time, forming source and drain electrodes, and solid contact window at three end points of T channel; forming gate DL, and forming conducting layer; patterning the conducting layer in order to form gate electrode crossing over lateral channel of the T channel; gate electrode and solid contact window are located at two sides of lateral channel.

A liquid crystal layer (3) is sandwiched between upper substrates (1) and lower substrates (2), a segment electrode (5g) and an auxiliary electrode (11) surrounding the segment electrode (5g) with a gap (G1) are formed on the upper substrate (1) by using the same transparent conductive film. An opposite electrode (6) is provided over the whole display area of the lower substrate (2). The overlap between the counter electrode (6) and the segment electrode (5g) constitutes a pixel portion (32), and the overlap between the opposite electrode (6) and the auxiliary electrode (11) constitutes a background portion (33). Voltages are selectively applied to the liquid crystal layer (3) of the pixel portion (32) and that of the background portion (33), and thereby the transmission, diffusion, or absorption of the light incident on the liquid crystal layer (3) is arbitrarily varied to conduct display.

Provided is a three-phase bridge-type half-control rectification trigger circuit with the protection function. By means of the three-phase bridge-type half-control rectification trigger circuit with the protection function, pre-charging of a three-phase bridge-type half-control rectification circuit and regulation of a busbar voltage can be achieved. The three-phase bridge-type half-control rectification trigger circuit with the protection function mainly comprises a DSP controller, a Butterworth low-pass filtering circuit, a synchronous detection link device, a phase-shifting control chip and a drive circuit. It is achieved that the busbar voltage is regulated according to the duty ratio of PWM waves output by a DSP main control chip, and therefore the charging current of a capacitor is lowered during starting. Pre-charging of the three-phase bridge-type half-control rectification circuit is achieved, and the cost of a high-power inverter is lowered. Meanwhile, when the inverter operates, whether a three-phase incoming line current is an over-current and whether phase loss of a three-phase incoming line voltage occurs can be detected, a fault signal can be fed back to the DSP controller, and therefore safe operation of the inverter is guaranteed. The three-phase bridge-type half-control rectification trigger circuit with the protection function has the advantages of being flexible in control, good in charging effect, economical, practical, perfect in protection function and reliable in performance.

The invention discloses a preparation method of a three-dimensional framework polymer-based high-dielectric composite material based on a core-shell structure, and relates to the technical field of high-dielectric composite materials. The preparation method comprises the following steps: pretreatment of foamed nickel, preparation of foamed nickel / barium titanate, and preparation of the polymer-based high-dielectric composite material, wherein the polymer-based high-dielectric composite material is divided into three kinds, namely, foamed nickel / barium titanate / epoxy resin, a nickel oxide / barium titanate / epoxy resin composite material and a nickel oxide (nickel) / barium titanate / epoxy resin composite material. According to the prepared polymer-based high-dielectric composite material, a dielectric constant up to 8000 can be obtained under the condition that the loss is lower than 0.1, the dielectric constant and the loss can be conveniently changed by adjusting the electrophoretic deposition amount, the sintering temperature and the oxidation temperature, and the preparation method of the polymer-based high-dielectric composite material has the advantages of being simple, easy to operate, high in applicability and practicability and the like.

The present disclosure provides a semi-direct drive DC wind power generating set and its control method and equipment. The control method includes: determining the reference output voltage of the reactive power compensation device when the semi-direct drive DC wind power generating set operates in the maximum power point tracking MPPT mode; taking the determined reference output voltage of the reactive power compensation device as the target, controlling the The output voltage of the power compensation device to adjust the voltage at the connection point, wherein the input end of the generator of the semi-direct drive DC wind power generating set is connected to the gearbox, and the output end of the generator is respectively connected to the The primary side of the machine-side transformer, the reactive power compensation device, and the secondary side of the machine-side transformer are connected to the output end of the semi-direct drive DC wind power generating set via a rectifier and a high-voltage switchgear in sequence.

A flexible AC power transmission system based on flywheel energy storage, including a double-fed flywheel energy storage motor, an AC excitation power supply, a monitoring device, a series transformer and an anti-parallel bidirectional thyristor. The AC excitation power supply includes a parallel-side converter, a series-side converter and capacitors. The AC end of the parallel-side converter is connected to the rotor winding of the doubly-fed flywheel energy storage motor. The two DC terminals of the parallel-side converter and the two DC terminals of the series-side converter The terminals are respectively connected to both ends of the capacitor, and the AC terminal of the series side converter is connected to the primary winding of the series transformer. The secondary winding of the series transformer is connected in parallel with the anti-parallel bidirectional thyristor, and one end of the secondary winding of the series transformer is connected with the stator winding of the flywheel energy storage motor. The monitoring device realizes bypass protection by controlling the connection state of the anti-parallel bidirectional thyristor. The invention has the functions of energy storage, power generation, synchronous phase modulation, stable node voltage, changing line impedance to suppress oscillation, regulating line flow, etc., ensuring safe, economical and efficient operation of the power system.