7results about How to "Ripple Elimination" patented technology

The invention provides an electrode impedance test system for physical therapy. The electrode impedance test system comprises a microcontroller, a D / A conversion circuit, a power amplification circuit, a voltage detection circuit, a current detection circuit and a boosting transformer circuit. The microcontroller generates a square wave signal, the square wave signal is converted into a sinusoidal signal through the D / A conversion circuit, and the sinusoidal signal is amplified through the power amplification circuit. The boosting transformer transmits the amplified sinusoidal signal to the electrode slice, and the secondary side of the boosting transformer is connected with the voltage and current sampling circuit and is used for collecting a differential signal. According to the system, the electrode impedance of the electrode plates is detected through voltage and current sampling of the pair of electrode plates, common-mode interference and signal distortion are eliminated through the differential signal amplification circuit and the full-wave precision rectification circuit, and high-precision acquisition and detection of signals are ensured. The detected and rectified signals are converted into digital signals through the A / D conversion circuit, and the digital signals are input into the signal input end of the microcontroller.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

The invention discloses a magnetic confinement hybrid superconductive DC current limiter, which comprises a current limiting unit and a quench protection unit, and is characterized in that the current limiting unit comprises a resistor R and a superconductive coupling coil L2, and the resistor R and the superconductive coupling coil L2 are connected in parallel; the quench protection unit comprises a superconducting coupling coil L1 and a capacitor discharge module, and the superconducting coupling coil L1 and the capacitor discharge module are connected in series to form a series loop; the superconducting coupling coil L2 of the current limiting unit is coupled with the superconducting coupling coil L1 of the quench protection unit. The short-circuit current peak value can be effectively suppressed, the breaking current of the direct-current circuit breaker is reduced, and the reliability of system fault removal is improved.

The invention discloses a method for improving the wear resistance of a porcelain glazed brick by using artificial gemstone solid waste, and relates to the technical field of ceramic tile preparation. The invention relates to a method for improving the wear resistance of a porcelain glazed brick. The porcelain glazed brick is prepared from a glazed material containing artificial gem solid waste. The polishing glaze comprises the following raw materials in parts by weight: a parts of potassium feldspar (40 < = a < = 46), b parts of dolomite (10 < = b < = 13), c parts of washed soil (8 < = c < = 12), 8-10 parts of strontium carbonate, d parts of quartz (6 < = d < = 9), e parts of calcined talc (8 < = e < = 10), f parts of zinc oxide (4 < = f < = 6), g parts of aluminum oxide (1 < = g < = 3), 1-3 parts of wollastonite and h parts of artificial gemstone solid waste (2 < = h < = 5), and a + b + c + d + e + f + g = 89. According to the invention, the artificial gem solid waste is introduced into the formula of the polishing glaze, so that the pollution of the solid waste in the artificial gem industry can be reduced, the material cost of the polishing glaze is reduced, the wear resistance of the glazed brick can be improved, and a green and sustainable ecology is constructed.

This application discloses a low-power temperature-compensated RC oscillator, comprising a low-voltage linear buffer, an RC core circuit, a comparator, a Schmitt trigger, a non-overlapping clock generator, and a level shifter. The low-voltage linear buffer uses intrinsic transistors to reduce operating voltage and power consumption; the RC core circuit employs temperature compensation technology, including a series low-temperature drift resistor and a temperature-dependent current source, causing the equivalent resistance to increase with temperature; the comparator compares a triangular wave signal with a reference voltage and outputs a reference clock; the Schmitt trigger filters out clock glitches; the non-overlapping clock generator generates a two-phase clock with dead time to control charging and discharging; and the level shifter converts the low-voltage domain clock to the high-voltage domain. This oscillator eliminates the influence of comparator offset voltage through two-phase switching control and employs low-voltage and temperature compensation technology to achieve a high-precision, low-temperature drift reference frequency in a small area with low power consumption, making it suitable for compact sensing and measurement systems.

The utility model discloses a switch linear composite magnet driving circuit, and belongs to the technical field of electromagnet driving. Which comprises a switch half-bridge circuit composed of a switch tube and a diode, and a load series inductor is connected in the half-bridge switch circuit, and is characterized in that a first current sampling module and a second current sampling module are respectively arranged, and the output end of the first current sampling module and the output end of the second current sampling module are connected with the input end of a PI control module; the output end of the PI control module is connected with the base electrode of the triode, the output end of the second current sampling module is connected with the collector electrode of the triode, the emitter electrode of the triode is connected with the half-bridge switching circuit, the output end of the PI control module is further connected with the controller, the output end of the controller is connected with the control end of the switching tube, and the main circuit current is adjusted by controlling the duty ratio. In the switch linear composite magnet driving circuit, the linear power amplifier is used for current shunting, so that ripple waves are effectively eliminated, and the stability of an electromagnet system is improved.

A ripple injection type DC converter and electronic equipment, the ripple injection type DC converter comprising a DC conversion circuit, a sampling circuit, a ripple generation circuit and a clamping circuit. The ripple generation circuit generates a ripple feedback signal based on a first sampling voltage, which is conducive to eliminating the ripple in the output voltage according to the ripple feedback signal. At the same time, the voltage in the ripple generation circuit is clamped by the clamping circuit, which can eliminate the problem of system instability caused by the loop gain of the ripple injection type DC converter changing with the output voltage, thereby expanding the range of the output voltage that can be output.