摘要:
The present invention discloses a power conversion circuit. A control module controls a pulse width modulation regulator to regulate a duty cycle of a DC-DC converter according to the direct current link voltage of the DC-DC converter and the output current and voltage of a renewable power supply. The control module also controls the pulse width modulation regulator to regulate a duty cycle of a DC-AC inverter according to the direct current link voltage of the DC-DC converter, output voltage of a utility power supply, and the output current and voltage of the renewable power supply.
摘要:
The present invention discloses an adsorption type refrigerator that automatically determines the switchover point. The adsorption type refrigerator includes a first vacuum chamber, a second vacuum chamber, a third vacuum chamber and a waterway structure. The waterway structure is connected to a first adsorption bed in the first vacuum chamber and a second adsorption bed in the second vacuum chamber. The waterway structure simultaneously conveys hot water into the first adsorption bed and cold water into the second adsorption bed, or simultaneously conveys cold water into the first adsorption bed and hot water into the second adsorption bed so as to allow the first and the second adsorption beds to conduct adsorption and desorption alternatively. This alternation creates pressure variation in the three vacuum chambers, which is then utilized to automatically determine the switchover point at which the refrigerator can provide and maintain a cold, stable environment.
摘要:
A voltage regulator for a fuel cell and a method therefor are disclosed. Inputs of converters are connected to the fuel cell in parallel and outputs of the converters are connected between a positive terminal and a negative terminal of a load in series. The output of the fuel cell is converted by the converters and combined to output as an output voltage, which is provided to the load as a working voltage of the load. A control circuit in the voltage regulator receives a feedback signal related to the output voltage to feedback control the converters, such that each converter outputs the same constant voltage.
摘要:
A grid-connected power conversion circuitry and a power conversion method thereof are disclosed. A DC-DC converter converts a renewable energy into a stable and constant DC power. A DC-AC inverter inverts the DC power into an AC power. The duty cycle of the DC-DC converter is adjusted based on a feedback signal related to the DC power, thereby stabilizing the output of the DC-DC converter. The duty cycle of the DC-AC inverter is adjusted based on a feedback signal related to the AC power as well as the phase angle of grid power that is in turn detected by a phase angle processor. Consequently, the AC power can be synchronized with the grid power in frequency. Therefore, the grid system provides auxiliary power when the renewable energy is insufficient, and the AC power output by the DC-AC inverter is synchronized with the grid power in frequency.
摘要:
The present invention discloses a ventilation system for tunnel engineering. The ventilation system is for use in a tunnel having at least one first shaft and at least one second shaft. The ventilation system includes a heat collecting device, a cooling device, and at least one piping system. The piping system is connected to the heat collecting device and the cooling device. A portion of the piping system coils inside the first and second shafts. Increasing the temperature in the first shaft and/or decreasing the temperature in the second shaft introduces ambient air into the tunnel via the first and second shafts by natural convection, thereby decreasing and maintaining the temperature in the tunnel and renewing air therein. The ventilation system advantageously features low power consumption and low manufacturing costs and is fit for use in long-distance tunnel engineering that requires multi-point installation of the ventilation system.
摘要:
A hydrogen storage device includes a first casing and a second casing. A hydrogen storage material is disposed in a receiving space formed inside the first casing. The second casing encloses the first casing such that the first and second casings jointly form an outer flow channel structure. Furthermore, the first casing has a surface extended inward of the first casing to form a recess. By disposing a baffle inside the recess, a curved inner flow channel structure is formed in the recess of the first casing. With this simple structure, a heat exchange substance can exchange heat with the hydrogen storage material, which is disposed inside the receiving space, via both the outer flow channel structure and the curved inner flow channel structure. Therefore, the heat exchange rate can be increased to accelerate the storage and release of hydrogen.
摘要:
A method for guiding symmetric implantation of bone screws is provided. The method includes the steps of: providing a spinal image of a spine, wherein the spine has a first bone screw implanted in one side of a spinous process of the spine; obtaining a first implanting information of the first bone screw; setting a reference line in the spinal image; generating a second implanting information by mirroring the first implanting information with respect to the reference line; and guiding a second bone screw to be implanted in the other side of the spinous process according to the second implanting information. The method generates a second implanting information that is based on and symmetric to the first implanting information, thus allowing the bone screws to be precisely implanted in both sides of the spinous process and aligned with each other in the same transverse section of the spinous process.
摘要:
A surgical tool calibrating device for calibrating a surgical tool is provided. The surgical tool calibrating device includes a calibration block, an electronic sensing module, a diameter measurement module, and a signal communication module. The calibration block has a tool inserting portion in which the surgical tool can be inserted. The electronic sensing module is disposed on the bottom of the tool inserting portion for sensing the tip of the surgical tool and generating a measuring signal accordingly. The diameter measurement module is mounted around the tool inserting portion. The diameter measurement module is actuated to sense the surgical tool and measure the diameter of the surgical tool upon reception of the measuring signal. The signal communication module is electrically connected to the electronic sensing module and the diameter measurement module for transmitting the measuring signal.
摘要:
An implant structure for medical use is provided. The implant structure includes an implant body and a nailing portion. The implant body and the nailing portion are integrally formed as a unitary structure to thereby prevent separation between the implant body and the nailing portion which might otherwise occur after long use. The nailing portion has a bone-contacting surface with at least one barb unit formed thereon for enhancing the bonding of the implant structure and a bone, preventing the implant structure from loosening, and extending the service life of the implant structure.
摘要:
An analysis method for a regional image is disclosed for an image datum from a C-arm device. The analysis method includes: providing an indication module, reading the image datum, selecting a plurality of ROIs (Regions of Interest), calculating an average brightness of each of the ROIs, searching every of the steel ball image data, comparing each of the steel ball image data and analyzing each of the steel ball image data. By individually analyzing the regional image datum, the brighter or darker image signal can be excluded so that it can improve precision during searching the steel ball image data. Moreover, it is also more effective for comparing an image profile of the steel ball image datum with a real profile of the steel ball of the indication module. Thus, the steel ball image can be readily defined by its correspondence with the steel ball of the indication module.