40 results about "Reverse converter" patented technology

An apparatus for making recording media with audio code images by combining visual images converted from image information and audio code images encoded to be optically readable from audio information relating to the image information. This apparatus includes a monitor 60 for displaying composite images of visual images and audio code images. To transmit to a speaker audio signals corresponding to the audio code images displayed on the monitor 60, the apparatus has a first audio code image checking function including a pointing device 81 or keyboard 86, an audio data retriever 82, an audio reproducer 83, a speaker 84 and a controller 100, and a second audio code image checking function including the pointing device 81 or keyboard 86, audio reproducer 83, speaker 84, a reverse converter 85 and controller 100.

This invention relates to one power drive system for LCD device, which comprises the following parts as: one power circuit to provide needed voltage for the device; one reverse converter to convert the outer power input voltage alternating electricity into low voltage direct current electricity to multiple path output as the needed work voltage for the LCD device.

The application discloses an auto tapping control method and an auto tapping control system of a converter. The method includes the steps of: 1) when a tapping signal is received, controlling a ladle trolley which carries a ladle to move to an initial receiving position, and controlling the converter to be rocked to an initial tapping position, so that molten steel in the converter rushes out from a water seal of a tapping hole, and controlling the converter to remain at the initial tapping position for a corresponding tapping time so as to receive the molten steel by the ladle; 2) according to preset converter rocking angles T in every time, controlling the converter to rock from the initial tapping position to a tapping finish position, and after every time of the converter rocking operation, enabling the converter to remain for a corresponding tapping time; 3) controlling the ladle trolley to move to ensure that the ladle can receive the molten steel in the whole converter rocking process; and 4) when the converter is rocked to the tapping finish position, controlling the converter to remain for a corresponding tapping time, closing a slag baffle, and performing reverse converter rocking until the converter returns to the initial position. The method can achieve automatic tapping, improves tapping efficiency, can avoid a problem that slag flows out with the molten steel, and improves tapping quality.

The disclosure relates to a control circuit, a control method and a flyback converter of primary-side feedback control including the control circuit. On the basis of the current sampling signal feedback, the flyback converter of primary-side feedback control is controlled to operate in a constant on time mode when the input voltage is large, and is controlled to operate in a peak current mode when the input voltage is close to a valley. Thus, the peak value of the primary-side current may not become too small because of a decreased input voltage, further avoiding occurrence of an error sampling after a blanking time due to excessive variations in demagnetization time.

Guided adiabatic bend transitions for multimode fibers are presented to preserve the power of guided light in the fundamental mode while guiding from one level of curvature to another for improved operation of mode filters and fiber amplifiers. A method is provided to find the guidance path. Implementations of these transducers include modal power back converters, and guidance paths into and out of higher order mode filtering devices which work on bending. A spiral structure is shown to incorporate adiabatic bends for a forward-pumped fiber amplifier.

The invention discloses a direct current power transmission system commutation failure fault recovery method. The method comprises the following steps of step1, collecting the direct voltage and the direct current of a direct current power transmission system, and the alternating voltage of an alternating current power grid connected to a reverse converter station; step2, according to an analog quantity collected in step 1, determining whether the direct current power transmission system has a commutation failure fault; step3, If the commutation failure fault occurs, making a rectifier converter station increase a firing angle, and making the reverse converter station trip off a direct current circuit breaker, simultaneously using the commutation failure time accumulator of the reverse converter station to start carrying out timekeeping and accumulate commutation failure time; when waiting set time is up or the commutation failure fault disappears within a certain time, making the rectifier converter station reduce the firing angle, making the reverse converter station reconnect the direct current circuit breaker, trying to restore direct current power to a level before the fault and resetting the commutation failure time accumulator of the reverse converter station. In the invention, the commutation failure fault of the direct current power transmission system can be effectively processed, and a condition that a power fluctuation brought by a direct current continuous commutation failure jeopardizes the safety and stability of the connected alternating current power grid is avoided.

An additional track system and wheeled vehicle with a wheel forward/reverse converter includes a wheel forward/reverse converter, a track traveling member and a wheel shoe connection assembly. The wheel forward/reverse converter includes a wheel forward/reverse converter, a track traveling member, and a wheel shoe connection assembly. When tracked driving is required, A track running device and awheel shoe connecting assembly are mounted on the lower part of the wheel, the track is pressed tightly by the vehicle gravity, the wheel is reversed by a wheel reversing mechanism, and after the tiredrives the outer surface of the track, the track section at the rear part of the track running part will be continuously retracted, and the track at the front part will be continuously released, andthe vehicle will travel forward under the action of winding force. The wheel forward-reverse converter is composed of a set of planetary gear train, including a sun gear, a planetary gear, a ring gearand a planet carrier. At that same time, the additional track system and wheeled vehicle with a wheel forward/reverse converter avoid the disadvantages that the additional track of the wheeled vehicle driven by the intermediate idle wheel is easy to produce the transmission stress concentration, the volume is large and the like, and has the advantages of convenient use, strong universality and low manufacture cost.

A motor drive device includes: reverse converter that converts DC power from a forward converter into AC power; a DC link capacitor provided in a DC link; a first current detection part that detects current flowing between the forward converter and capacitor; a second current detection part that detects current flowing between the capacitor and reverse converter; a voltage detection part that detects a voltage of the capacitor; and a capacitance decline detection part that obtains a change value in electric charge of the capacitor from a n integrated value by integrated a predetermined time of a difference in current values detected by the current detection parts, obtains a capacitance value of the capacitor based on the obtained change amount in electric charge and change amount in voltage of the capacitor for the predetermined time, and detects a capacitance decline in the capacitor based on the obtained capacitance value.

The invention relates to an image and video signal converting device and method, including forward converter and converting method, or reverse converter and converting method, where the forward converter includes input device, forward converting device, zoom device and output device, all interconnected in turn, and the forward converting device is connected with forward conversion coefficient storage device, and the characteristic of the forward converter lies in that: the zoom device is arranged between the forward converting device and the output device; the reverse converter is composed of input device, reverse converting device, output device and reverse conversion coefficient storage device, and the characteristic of the reverse converter lies in that: the reverse converting device is connected between the output device and the input device, the reverse conversion coefficient storage device is connected with the reverse converting device; it has the characters of simple structure and stable performance, and it is an image and video signal converting device and method that can convert video, image and forecast residual error signal of video or image.

The invention discloses a fully-automatic feces-cleaning device used for animal husbandry breeding industry. The device includes a feces storage tank, steering wheels, a pull rope, a bearing chain, adriving wheel, an engine, a forward and backward converter, a machine frame, a scraping plate, telescopic push rods and an obstacle sensor; the top of the machine frame is provided with the engine andthe driving wheel arranged on one side of the engine, one side of the driving wheel is provided with first driven wheels and the bearing chain arranged on the first driven wheels, one side of the first driven wheels is provided with second driven wheels and the pull rope arranged on the second driven wheels, and each second driven wheel is connected with one corresponding first driven wheel; andone side of the machine frame is provided with the feces storage tank and the obstacle sensor arranged on one side of the feces storage tank, the telescopic push rods and a power device arranged on the telescopic push rods are arranged between the feces storage tank and the machine frame, and a connection hub is arranged on the top of the feces storage tank. According to the device disclosed by the invention, the practical performance of the fully-automatic feces-cleaning machine used for the animal husbandry breeding industry is effectively improved, and cleanliness of the environment of an animal husbandry breeding factory is guaranteed; and an intelligent control system is added, so that working pressure of workers is greatly reduced.

The invention provides a power conversion device for outputting AC power having variable voltage and variable frequency. The power conversion device comprises a forward converter for rectifying and converting AC voltage of an AC power source into DC voltage, a DC intermediate circuit having a smoothing capacitor for smoothing the DC voltage of the forward converter, a current-limiting circuit for suppressing a charge current to the smoothing capacitor of the DC intermediate circuit, a voltage detection circuit for detecting the voltage of the DC intermediate circuit, and a reverse converter for converting the DC voltage of the forward converter into AC voltage. A plurality of relays are connected in parallel to a resistor of the current-limiting circuit, and the plurality of relays are switched on when the rate of change of the voltage detection value of the DC intermediate circuit is equal to or less than a value set in advance.

The invention discloses a modular dual-CUK step-up-down output anti-parallel combined inverter which is formed by combining two SEPIC converters having parallel inputs and anti-parallel outputs. EachCUK converter outputs a half sine wave and two half sine waves are combined into a complete sine wave. The dual-CUK step-up-down output anti-parallel combined inverter is unipolarly modulated. The switching devices S1, S2, S3 and S4 are all full control devices. The switching devices S1/S2 control on-off of the forward converter. The switching devices S3/S4 control the on-off of the reverse converter. The switching devices S2/S4 are used to gate the forward/reverse converters. The switching devices S1/S3 are used to control the forward/reverse converters to output a half sine voltage. The inverter can realize step-up and step-down inversion, has a wide input voltage range, good adaptability to photovoltaic cell voltage variation, high conversion efficiency and simple system, can be modularly produced, is low in cost and wide in range, and can be widely used for photovoltaic grid-connected power generation systems.

The invention discloses a multifunctional ballast comprising an alternating current-direct current conversion circuit, a filter rectifier circuit, a reverse converter, an output terminal, an electromagnetic filter circuit, a power correction circuit, and a short circuit protection device. The electromagnetic filter circuit is connected between a voltage input terminal and the alternating current-direct current conversion circuit; the power correction circuit is connected between the alternating current-direct current conversion circuit and the filter rectifier circuit; and the short circuit protection device is arranged in the reverse converter. According to the invention, two multifunctional ballasts are arranged in a same multifunctional ballast module and are controlled by a multifunctional ballast control circuit connected with the multifunctional ballasts, thereby realizing starting, shutdown, and crossed exchange functions of the two multifunctional ballasts. Besides, the multifunctional ballast also has functions of high instantaneous spike pulse or strong thunder interference resistance, effective surge current suppression, multi-load outputting, delayed starting, and prolonged lamp service life.

The invention provides a forward-flyback power supply circuit, and the circuit integrates the advantages of a forward converter and a flyback converter and utilizes the characteristic that an output inductor changes along with the change of an input voltage to reduce the change rate of the current of a forward loop at a high-low voltage current. In addition, by adjusting the number of turns of theforward winding and the inductance value of the output inductor, it can be guaranteed that the current of the forward loop is basically kept unchanged at high voltage and low voltage, and therefore the size of the forward-reverse converter is reduced, and output ripples are reduced through reasonable energy distribution of the forward loop and the flyback loop; the ZVS of the main switching tubeis realized by utilizing the active clamping circuit, so the efficiency of the flyback converter is improved, and the EMI is improved.

A motor drive device can detect abnormality of a power supply unit. The motor drive device has an abnormality detection function for a power supply input part (4) between the device (1) and a power supply (2), and includes: a rectifier (11) that is inputted AC power from the power supply (2) via the power supply input part (4), and converts the AC power into DC power; a reverse converter (12) thatconverts the DC power from the rectifier (11) into AC power; a DC link capacitor (13) provided to a DC link between the rectifier (11) and the reverse converter (12); a voltage detection part (14) that detects voltage of the DC link capacitor (13); and an abnormality detection part (16) that obtains a voltage change amount for a predetermined time of the DC link capacitor (13) based on voltage values detected by the voltage detection part (14), and performs abnormality detection on the power supply input part (4) based on the voltage change amount thus obtained.