113results about How to "Adjustable output voltage" patented technology

A redundant power distribution system (74) that has multiple distribution lines (168) and (174) includes multiple regulators (122). Multiple isolation transformers (124) are coupled to the regulators (122) and have isolation boundaries (261). An R(M/N) device circuit (152) is coupled to the isolation transformers (124). The regulators (122) and the isolation transformers (124) have a non-feedback looped configuration (259) across the isolation boundaries (261).

A power converter device and method are provided. The power converter device includes an input power source and an input inductor configured for coupling a power of the input power source to the device. A switch is configured to regulate a power of the input power source through the input inductor. A shunting diode is coupled between the switch and the input inductor. A resonant load is coupled with the input inductor. A switching element is coupled with the input inductor and the resonant load and configured to operate at a fixed frequency. The power converter device also includes a control circuit for modulating a frequency of the switch and a driving module for driving the switching element at the fixed frequency. In an exemplary embodiment, the power converter device is a Class-E amplifier. The fixed frequency is a frequency equal to a resonant frequency of the resonant load. In one embodiment, the power converter device is configured as an integrated circuit device.

The invention provides a full-interdigital electrode micro-piezoelectric thick film vibration energy collector and a manufacturing method thereof. The full-interdigital electrode micro-piezoelectric thick film vibration energy collector comprises a piezoelectric cantilever beam and a mass block; the piezoelectric cantilever beam comprises a flexible substrate, an insulation layer, a interdigital electrode posts and a piezoelectric layer; the flexible substrate is stainless steel; the piezoelectric layer is of a PZT (piezoelectric transition) piezoelectric thick film material; the interdigital electrode posts penetrate all the way to the upper surface of the substrate from the surface of a piezoelectric material, the piezoelectric material can be fully polarized, and the problem about incomplete polarization of materials in surface interdigital electrode d33 mode energy collector is avoided. The energy collector is long in service life, large in high-voltage regulation range and capable of powering wireless sensor nodes and medical equipment.

An average current mode buck-boost DC to DC converter has a buck stage coupled between an input voltage source terminal and an output terminal. A boost stage is coupled between the input voltage source terminal and the output terminal. A current ramp control circuit generates a ramp signal for driving the buck and boost stages, the ramp signals being coupled to the buck and boost stages. A constant voltage related to the desired output voltage by a constant is applied directly to both a voltage control feedback loop for adjusting the output voltage and directly to an input to the current ramp control circuit, whereby the output voltage can be shifted from one voltage to another by feedforward control.

The invention discloses a pulse current injection source for an HEMP conduction immunity test, and relates to a pulse current generating apparatus technology. The injection source comprises a high-voltage charging power source, a Marx generator, an impedance match module and a controller, wherein the output end of the high-voltage charging power source is connected with the input end of the Marx generator, the high-voltage charging power source is used for providing high-voltage charging power supply for the Marx generator, the output end of the Marx generator is connected with the input end of the impedance match module, and the Marx generator outputs dual-index waves and outputs dual-index pulse current waveforms conforming to requirements of standards after shaping and impedance matching of the impedance match module. The pulse current injection source can conveniently change the output current waveforms, peak currents and source internal resistance of the pulse current injection source, facilitates realization of high-altitude nuclear power magnetic pulse conduction immunity tests with different standards by use of one pulse current injection source, and is high in versatility and convenient to use.

The invention provides a maximum power tracking system and a maximum power tracking method of a power transmission line induction power supply source. The method comprises the following steps of: detecting output voltage of a power supply coil and rectifying and amplifying the output voltage to obtain first output voltage; detecting output voltage of a measuring coil and performing rectification, amplification and phase-shift processing on the output voltage to obtain a reference voltage; outputting a drive control signal according to a comparison result of the two voltages; and switching on or off a switch tube by using the drive control signal to correspondingly select a battery or the power supply coil for supplying power for a load. By using the system and the method, the output voltage of the power supply coil can be adjusted by changing the duty ratio size of a gate drive signal of the switch tube to track the reference voltage all the time, thereby dynamically adjusting the output power of the power supply coil. In addition, when the power supply source and a backup battery are used for simultaneously supplying power, the time for supplying power for the load by the battery can be shortened to the greatest extent since the power supply coil works at the maximum power point for the most of time, so that the design life of the entire power supply source is prolonged.

The invention discloses a single-phase reluctance generator which comprises a stator and a rotor in projecting magnetic pole structures by stacking silicon-steel sheets. Stator magnetic poles are provided with concentrated armature windings which are connected in series or parallel into a group according to the N polarity and the S polarity of the armature windings; rotary magnetic poles arranged on the rotor has the same number as the magnetic pole number of the stator and comprise winding excitation magnetic poles or permanent-magnet magnetic poles and permanent-magnet excitation mixed magnetic poles; magnetic pole windings adjacent to the rotor are connected in series or parallel to form a plurality of N groups and S groups; and the stator poles and the rotor poles consist of 2-stage poles, 4-stage poles, or even n-stage poles, namely even poles or pair poles, respectively comprise different stage poles and have the same total pair poles. The invention adopts a stator isopolar technology so that the rotor can adopt different modes, such as the excitation magnetic poles, the permanent-magnet magnetic poles and the mixed magnetic poles of the permanent-magnet magnetic poles and the electric excitation magnetic poles, and the stator windings can be simultaneously utilized; the dynamic combination of the windings connected in series or parallel facilitates the adjustment of an output voltage, improves the utilization rate of the windings, enhances the power density of the generator and improves the performance and the efficiency of the generator.

Process and device for controlling the drive means of a conveyor system 10, specifically in the form of an escalator or passenger conveyor, which can be switched from load to no-load operation, comprising a drive motor 26 and a variable frequency converter 42, which at is least controllable with respect to the frequency of its output voltage, wherein, under load, the drive motor 26 is supplied with a line voltage with an essentially constant line frequency and, at no-load, is supplied the output voltage of the variable frequency converter's 42, wherein, prior to a changeover from no-load to load operation, the output frequency of the variable frequency converter 42 is essentially brought with phase accuracy to the line frequency by means of a PLL device 30, and wherein this changeover is brought about as soon as this phase conformance has been realized.

The invention provides a light emitting diode (LED) centralized DC (direct-current) power supply system and operating methods thereof. The proposed DC power supply system comprises a three-phase AC (alternating-current) input interface, a DC power supply output interface, N+1 three-phase PWM (pulse width modulation) rectifier modules, LED cluster loads and a power supply management module. The proposed operating methods are described as following: the power supply management module adjusts the duty ratio of the three-phase PWM rectifier modules, based on the control signals formed by synthesizing the information about voltage and current of the positive and negative output buses, the three-phase AC input ends, control signals and output of the three-phase PWM rectifier modules, hence AC voltage of power grid can be directly converted into adjustable DC voltage by the PWM rectifier.

The invention relates to a rectifier circuit, comprising two inductors L1 and L2, a first switch element Q1, a second switch element Q2, a third switch element Q3, three diodes D3, D4 and D5, and two capacitors DC1 and C2, wherein one end of the inductor L1 is connected with a fire wire and the other end thereof is connected with the cathode of the diode D3, one end of the capacitor DC1 and one end of the third switch element Q3 simultaneously by the first switch element Q2; the other end of the inductor L1 is connected with the anode of the diode D4, the other end of the capacitor DC1 and the anode of the diode D5 simultaneously by the second switch element; the anode of the diode D3 and the cathode of the diode D4 are connected with the zero line simultaneously; the cathode of the diode D5 is connected with the other end of the third switch element Q3; furthermore, the inductor L2 is connected in series with the capacitor C2 and is then connected in parallel to the diode D5. The rectifier circuit can greatly reduce the harmonic current and improve the circuit power factor; furthermore, compared with the output voltage, the input voltage can be output in a reducing or boosting way.

The invention discloses a current mode reference voltage source based on downward current compensation. The current mode reference voltage source can work under quite low power voltage, and output voltage of the reference voltage source can be changed by adjusting device parameters. The current mode reference voltage source comprises a compensation current generating circuit and a reference voltage generating circuit.

The invention relates to a pulse width modulation push-pull type positive output electrostatic spinning high-voltage complete machine power supply. A control circuit is connected with a driving circuit, a voltage stabilization circuit, an output voltage feedback circuit and an output current sampling and overcurrent protection circuit respectively; an output rectifying and filtering circuit is connected with the driving circuit, the output voltage feedback circuit and the output current sampling and overcurrent protection circuit respectively; a resetting control circuit is connected with an output voltage monitoring circuit through the output current sampling and overcurrent protection circuit, a soft starting circuit, a control voltage amplitude limiting circuit and the output voltage feedback circuit; and the voltage stabilization circuit is connected with the driving circuit through a power supply circuit. The pulse width modulation push-pull type positive output electrostatic spinning high-voltage complete machine power supply has a simple structure, and the small-size and modularized circuit design is easy to manufacture and maintain; the power supply is low in time drift and temperature drift, the output ripple is low and the stability is high; the output voltage is adjustable; due to the digital monitoring display of the output voltage and the output current, the powersupply is flexible and convenient to operate and use; and the power supply has functions of overcurrent and short-circuit protection, can work for long time stably, and is high in reliability.

The invention discloses a high-power parallel switch power circuit capable of realizing adjustability and current equalization, and relates to a switch power circuit. By using a power supply expanded by parallel modules, the current equalization is realized by using a maximum current self-current-equalization method and an external current equalization controller mode, the structure is complicated, and the cost is high. The high-power parallel switch power circuit capable of realizing the adjustability and the current equalization is characterized by comprising a control circuit, wherein the control circuit comprises a current sampling unit, a voltage sampling unit, a current equalization bus unit connected with the current sampling unit, a current equalization control voltage acquisition unit, an adjustable external reference voltage unit, an adjustable external current-limiting reference voltage unit, a voltage error amplification unit and a current error amplification unit. The voltage error amplification unit comprises a first operational amplifier; and the first operational amplifier is connected with the voltage sampling unit, the current equalization bus unit, the adjustable external reference voltage unit and the current equalization control voltage acquisition unit. By adopting the technical scheme, the maximum current self current equalization can be realized by a pure hardware circuit, and a controller is not needed; furthermore, a practical circuit with adjustable output voltage can be achieved; and the high-power parallel switch power circuit is simple in structure and low in cost.

The invention belongs to the power equipment detection technology. In order to achieve diagnosing and identifying of partial discharge of silicone rubber under a composite electric field by using thehigh-frequency current transformer partial discharge detection technology, the high-frequency current method composite electric field power cable middle interface partial discharge detecting system iscomposed of a composite electric field partial discharge device, a high frequency current signal acquisition unit, a data transmission unit and a data processing unit; the composite electric field partial discharge device comprises a high voltage direct current power source, a pulse power source, a voltage composite unit and an analog partial discharge device; the output ends of the high voltagedirect current power source and the pulse power source are connected to the input end of the voltage composite unit; the analog partial discharge device is composed of a pin plate type electrode and asilicone rubber sample; and signals collected by the high frequency current signal acquisition unit are transmitted to the data processing unit through the data transmission unit to be processed andthen output. The high-frequency current method composite electric field power cable middle interface partial discharge detecting system is mainly applied to the design and manufacturing occasions of apower equipment detection device.

The invention provides an adjustable multi-output isolated voltage stabilizing power circuit which comprises an input overvoltage protection circuit, a reversal connection preventive protection circuit, a voltage control circuit, an energy conversion inductance assembly and a multipath output circuit in successive connection. The energy conversion inductance assembly comprises one group of primary inductance coils and multiple groups of secondary inductance coils, each group of secondary inductance coils corresponds to one path of output of the multipath output circuit, the voltage control circuit comprises a power device in which an oscillator is integrated and a voltage feedback circuit and a compensation circuit connected to the power device, and the power device is connected with the multipath output circuit via the voltage feedback circuit. The adjustable multi-output isolated voltage stabilizing power circuit is characterized by wide change range of input power, high voltage conversion efficiency, fewer peripheral devices, electrical isolation, multipath output and adjustable output voltage, is applied to electric control systems of certain diesel engines successfully, and has great reference values for other power circuits.

The invention relates to a charge pump circuit of bilateral regulation type which is provided with an output end, a charge pump conversion circuit, and a control circuit of bilateral regulation. The charge pump conversion circuit is provided with a first capacitor, a second capacitor and a switch combinational circuit. The second capacitor is coupled between the output end and a reference potential on the ground. The control circuit of bilateral regulation is used for controlling the switch combinational circuit, so as to allow the charge pump conversion circuit to operate from a first phase to a fourth phase. In the first phase, a first electrode of the first capacitor is in a floating state. In a second phase, the first capacitor is coupled between the reference potential on the ground and input voltage. In a third phase, the first capacitor is coupled between the input voltage and the output end. In the fourth phase, the first electrode of the first capacitor is in a floating state.

Apparatus and method for electrostatic charging of a container for an electrostatic coating operation includes a support member for supporting a container during an electrostatic coating operation with the support member comprising a non-metallic conductive material or electrically semiconductive portion that directly contacts a surface of the container. The electrically semiconductive portion comprises non-metallic, resistive or low conductivity material and is coupled to a source of electrical energy such that the container is electrostatically charged to an opposite polarity to offset or reduce electrostatic charge build up produced by the electrostatic coating operation.

The invention discloses a CLTCL resonant current converter. The CLTCL resonant current converter is composed of a half-bridge inversion circuit, a CLTCL resonant circuit and a diode rectification circuit, which are connected in sequence; the converter is input through the half-bridge inversion circuit and is output from the diode rectification circuit through the action of the CLTCL resonant circuit; the half-bridge inversion circuit is composed of a first switching tube and a second switching tube; the CLTCL resonant circuit is composed of a first capacitor, a second capacitor, a first inductor, a second inductor, a first transformer and a second transformer; the diode rectification circuit comprises a first diode, a second diode, a third diode, a fourth diode and a third capacitor; the converter is of a novel direct-current converter circuit topology and can realize zero voltage switching (ZVS) and quasi-zero current switching (Q-ZCS) of the switching tubes, and zero current switching (ZCS) of the diodes of the rear-grade rectification circuit; the efficiency and capacity of the converter are improved; the CLTCL resonant current converter has the characteristic that an input/output voltage wide range is adjustable.

The invention discloses a multi-physics field coupling oil paper insulation partial discharge detection system based on a UHF method. The multi-physics field coupling oil paper insulation partial discharge detection system is mainly composed of a multi-physics field coupling oil paper insulation partial discharge device, a UHF signal acquisition device, a data transmitting unit and a host displayunit, wherein the multi-physics field coupling oil paper insulation partial discharge device comprises a DC power supply, a harmonic power supply, a compound unit and an analog partial discharge device; output ends of the DC power supply and the harmonic power supply are connected with an input end of the compound unit; an output end of the compound unit is connected with an input end of the analog partial discharge device; the UHF signal acquisition device is in signal connection with the analog partial discharge device; and the data transmitting unit is used for effectively acquiring partialdischarge pulse signals, and transmits the partial discharge pulse signals to the host display unit in a wireless transmission mode. The multi-physics field coupling oil paper insulation partial discharge detection system realizes the simultaneous application of a DC voltage and a harmonic voltage, and can simulate the complicated working conditions of a valve side bushing of a converter transformer precisely.

The invention discloses a pulse VCSEL (Vertical Cavity Surface Emitting Laser) laser driving circuit based on USB power supply and a method thereof. The circuit comprises a VCSEL laser driving circuit, an energy storage circuit and a power processing module, wherein the VCSEL laser driving circuit is used for driving a VCSEL array; the energy storage circuit is used for storing electric energy and providing driving electric energy for the VCSEL laser driving circuit, and the energy storage circuit is electrically connected with the VCSEL laser driving circuit; and the power processing module is used for providing electric energy for the energy storage circuit, the power processing module is electrically connected with the energy storage circuit, the power supply module comprises a USB interface and the power processing module, and the power processing module is electrically connected with the USB interface.

The invention discloses a high-power adjustable DC (Direct Current) stabilized voltage power supply. The high-power adjustable DC stabilized voltage power supply is composed of a 220 V AC (Alternating Current), an AC step-down transformer, a full-bridge rectifier circuit, a sampling circuit, a sampling signal amplification and current-limiting protection circuit and a voltage division circuit, wherein an adjusting tube VT1 in the sampling signal amplification and current-limiting protection circuit adopts an enhanced N-channel high-power field-effect tube; and the selected type is 2SK790. As the adjusting tube in the former high-power serial adjustable stabilized voltage power supply almost adopts a high-power NPN type transistor or PNP type transistor, the disadvantage is that the adjusting tube is great in power consumption, thereby causing very low power conversion efficiency. By regarding a high-precision three-end adjustable branch reference voltage source TL431 as the core and adopting the enhanced N-channel high-power field-effect tube as the adjusting tube, the high-power adjustable DC stabilized voltage power supply, disclosed by the invention, not only can output a big current and adjust the outputting voltage, but also can improve conversion efficiency and reliability of the power supply greatly.