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This paper investigates the problem of switch-linear hybrid (SLH) and its application in reactive power compensation of single-phase static var generator (SVG). A composite unit (i.e., SLH), which is composed of a linear amplifier and a switch-filter unite, is proposed to improve the power quality, power supply efficiency and optimize the power factor. Besides, the topology and working principle of...
Medical X-ray machine provides a powerful technical support and guarantee for accurate diagnosis of certain human diseases in modern disease diagnosis. However, clinical application investigation shows that the X-ray source of medical X-ray machine has some defects such as low efficiency, high energy consumption, poor quality of imaging, bad control stability, lower repeat rate, which makes the X-ray...
Most industrial processes that use electricity as a source of voltage or current, require power circuit for the control of its physical quantities. Power converters are a multi-site privileged in the control of high power systems. In this article we show that the series resonant DC/DC converter, which is a hybrid system. The SRC achieves an output DC voltage equal to n times the input voltage of the...
The new family of AC voltage regulators based on the switching quasi-impedance of power supply or load is offered. Such AC-AC converters are intended for construction of conditioners of voltage quality, regulators of a soft start of induction motors, compensators of a reactive power, active filters of harmonics, devices of balancing of three-phase circuits, compensators of voltage sags in electric...
In the field of power system relay protection,the 220volts dc power supply is ofen used, and we often use the dual input power supply in order to increase reliability, however there are many shortcomings in the current dual switch switching circuit, for example,it needs a long time for the two power supply to switch when one of them fail to provide the electricity,besides , the two input power supply...
Based on the characteristics of switching power supply, this paper, taking MC34063A IC as the research object, has proposed the design, realized design of single-transistor positive buck DC-DC converter through calculation and component selection, and simulated the circuit of the design using Saber software. When the input voltage is 15V~25V, the output voltage has been stabilized within the scope...
Power supply is significant in the design of robot control system. A power design aiming at the requirement of wheeled mobile robot system is introduced in the paper. With battery pack used as input, the power circuit supplied multi-channel voltage outputs through step-up and step-down processes by the composition of switching regulator and linear regulator to meet different voltage requirements of...
High frequency of the switch power supply requires high precision and speed of the control, which means high performance of traditional single-chip microcomputer (SCM). Based on the analysis to the switch power supply's control loop, a new control method by using digital potentiometers have been proposed in this paper, and its feasibility has been validated by experiment.
This system designs a high efficient, low ripple switching power supply. It uses single-ended DC-DC forward converter, and the output range is controlled by regulating the pulse width of the PWM controller UC3844. The control part is called double closed-loop control circuit, composed by voltage feedback loop and current feedback loop. It can stable the output voltage, reduce voltage regulation and...
This paper presents a variety of traditional switching power supply auxiliary start circuits, and analyzes the characteristics and the defects of these circuits. On this basis, then proposes revised a start-up circuit of high voltage switch power-supply to solve the high loss-power problems derived from traditional start-up methods. Experimental results show that this new starting circuit has self-starting...
This paper presents a one stage circuit topology for a double buck chopper type single phase PFC converter with active power filtering function in a utility AC grid side and DC output power quality, which can realize much smaller in reactor size and lighter in its weight, along with two unique channel control schemes. The main advantageous point of the newly-proposed PFC converter includes that the...
In this paper, a intelligent charging system for VRLA battery is presented, we proposed the charging method which is the combination of three-section charging method with pulse charging method on the base of the analysis and summary of existing VRLA battery charging mode, this charging method effectively alleviate the polarization of VRLA batteries. A high-frequency switching power source with PFC...
The composition and control principle of one kind SPWM inverter power supply system based on the DSP chip were introduced. Inverter power supply system which got TMS320LF2407 DSP as control device used single polarity double frequency SPWM by asymmetric regular sampling method. Four switch tubes had realized zero-voltage and zero-current soft switch working state to enhance the circuit efficiency...
In order to drive linear high-power laser diode, we design a new-style and high-efficiency linear power supply and the temperature controlling system, achieving a high-stability current output from 0 to 6 A, whose current ripple is less than 1%. Innovative design of the rectifier mode switch circuit, voltage feedback networks, the soft-switch anti-surge filter circuit and over-current protection circuits...
Polymorphic gates can be considered as a new reconfigurable technology capable of integrating logic functions with sensing in a single compact structure. Polymorphic gates whose logic function can be controlled by the level of the power supply voltage (Vdd) represent a special class of polymorphic gates. A new polymorphic NAND/NOR gate controlled by Vdd is presented. This gate was fabricated and utilized...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
The paper deals with a front-end topology of a low power switched-mode power supply intended for a plug and play use. During its design, a special attention has been paid to a simple and cost effective solution confronted with a wide input line-voltage range (57 ?? 3?? 240)??(1 ?? 0.2) VRMS and with the frequency range from 40 Hz to 65 Hz. Such extreme demands are particularly of interest in industrial...
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