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"Power supply circuits"
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A Novel Design of Mechanical Switch for the High Overload Environment
The internal structure of the inertial measurement unit (IMU) in active state is easily damaged in the high overload environment. So that the IMU is usually required to be powered within the disappearance of the high overload. In this paper, a mechanical switch is designed to enable the IMU based on the analysis of the impact of high overload on the power-supply circuit. In which, parameters of mechanical switch are determined through theoretical calculation and data analysis. The innovation of the proposed structure lies in that the mechanical switch is triggered through the high overload process and could provide a delay signal for the circuit. After all, the proposed switch is tested through mechanical simulation, impact test and practical test. The experimental results show that the designed mechanical switch can effectively and reliably provide the delay for the circuit and guarantee operation of the IMU under high overload.
Journal Article
Calculation of the Power-Supply Circuit of an Ore-Smelting Furnace
A modern technique is proposed to calculate the electrical parameters of the characteristic sections of the power-supply circuits of ore-smelting furnaces, namely, laminated stacks, flexible part, and tubular busbars of the power-supply circuit of an electrode. This technique is based on the results of numerical simulation of the electromagnetic field of a set of conductors with the ANSYS software package and on a mathematical model for calculating the inductance of a system of two rectilinear conductors arbitrarily located in space.
Journal Article
Design of a Multi-Channel Expandable High-Precision Isolated Current Source Module
Small current source module has low accuracy, big ripple and cannot be used for multi-channel expansion and isolated output. In view of this, a high-precision isolated current source module for multi-channel expansion is designed. The current source module consists of an isolated power supply circuit, an A/D conversion circuit, a linear current stabilizer circuit, and a digital isolation circuit. MCU can implement control of the module through only three ordinary IO ports, and one MCU can simultaneously control multiple current source modules to complete multi-channel isolated output. The output accuracy of each channel can reach a level of 0.001mA.
Journal Article
Dual‐channel pre‐regulator structure for the bandgaps in high step‐down DC‐DC converters
High step‐down DC‐DC converters require a robust and low power pre‐regulated supply for bandgap reference. This paper proposes a structure that comprised of two current paths to achieve energy efficient pre‐regulation under high and low input voltage conditions. The design eliminated large size resistors for current limiting which is usually required for high input supplies. The presented pre‐regulator structure combined with the bandgap circuit was realized with the TSMC 180‐nm BCD process. The measured results show the proposed structure has a wide input voltage range of 3.5–45 V, a temperature coefficient of 5.63 ppm/°C and typical average current consumption of 1.1 μA. This paper proposed a dual‐channel pre‐regulation structure for the bandgaps, which is suitable for the high step‐down DC‐DC convertors with low quiescent current and small area requirement.
Journal Article
Research on the construction of low-current Airfield Groud Lighting system for civil airports in China
The 2.8A to 6.6A power supply method is widely used in Airfield Groud Lighting (AGL) system at present. This power supply method is formulated based on the luminous characteristics of halogen lamps. Although The LED light fixtures significantly reduce the energy consumption of the lamps, the energy-saving effect for the entire AGL system is not ideal, mainly due to the high current of the power supply circuit and the high loss of the circuit itself. Through the classification of low-current AGL system, this article proposes a low-current implementation method suitable for China’s civil aviation. For low-current AGL system, which cannot meet existing civil aviation industry standards and specifications in China’s civil airports, through analyzing the differences between low-current AGL system and existing 6.6A power supply systems in design requirements, implementation and construction, operation and maintenance, as well as existing technical specifications, Propose low Specific requirements for the application of current-assisted AGL system, and propose energy-saving retrofit technical solutions based on the characteristics of AGL projects, laying the foundation for the application of low-current AGL system in Chinese civil airports.
Journal Article
Design of a non-invasive blood pressure simulator based on oscillographic method
In this article, a non-invasive blood pressure simulation system based on the oscillographic method is proposed, and a piston-connecting rod-type variable air chamber is designed and installed in the system as the pulse waveform generation mechanism. It uses PWM constant current control and ultra-small subdivision technology to control the linear stepping motor to achieve stable and accurate displacement and to reproduce the pulse wave according to the blood pressure envelope, to simulate ambulatory blood pressure. In this article, a hardware circuit design scheme is also put forward, including a power supply circuit, pressure acquisition feedback circuit, stepping motor drive circuit, and so on. The experimental results show that the simulator can meet the requirements of JJF 1626-2017 Calibration Specification for NIBP Simulators and can be used as a calibration standard with efficiency and accuracy.
Journal Article
An intelligent power management system design of ground penetrating radar
A method for the design of an intelligent power management system for Ground Penetrating Radar (GPR) is presented in this article. For the mobile devices which are dependent on their battery power supply, the power management system is vital. The circuit design adopts a voltage stabilizer chip with low-loss and high-efficiency, greatly improving the equipment’s continuous operating time. The power management system also provides the functions as follows: battery charging and discharging automatically switching; providing stable, intelligent and controllable power supply to subsequent circuits; the power differential mode, common mode filtering and π filtering significantly decrease the power noise and enhance the stability of the devices; the power supply circuit is designed with anti-reverse insertion and overheat protection functions, which can prevent the equipment from working within the fault and abnormal temperature range and reduce the risk of equipment failure.
Journal Article
Two-phase switched reluctance motor drive control system design
The two-phase switching reluctance motor drive control system uses STM8S003F3 as the control chip to realize the control function. The hardware circuit is mainly composed of switched reluctance motor controller power and relay control circuit based on an asymmetric half-bridge circuit, a drive circuit module based on IR2101S, a rotor detection module based on a photoelectric sensor, current detection and protection circuit based on Hall current sensor, power supply circuit based on the multi-integrated chip. The control system has been significantly improved in safety and reliability.
Journal Article
Design of Plastic Sealed Brushless Motor Controller Based on Hall Effect
With the rapid development of electronic technology, brushless DC motors (BLDCM) are widely used in various fields such as electronics, industrial control, and the medical field because of their high efficiency, noiselessness, and high speed. However, the traditional BLDCM has large torque and cannot accurately determine the rotor position information. Therefore, this paper proposes the use of a Hall sensor controller to control the BLDCM and carries out the hardware circuit design of the motor driver circuit, Hall circuit, power supply circuit, etc., and the program control of STM32, and carries out the software design of PWM interrupt subroutine, AD picking like the program, etc., to realize the Hall effect sensor. The control of BLDCM is carried out.
Journal Article