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Electrical physics text book theory tells us that charging a capacitor is much less efficient than replenishing the energy in a discharged electro-chemical battery. If a fully discharged capacitor is pumped with a charge of Q coulombs, it stores 1/2QV while dissipating the same amount of energy in the loop resistance. However, if the same charge is pumped into a re-chargeable electrochemical cell...
This paper discusses a cost-effective technique for dynamic testing of DC-DC power supplies, based on the injection of a signal into the feedback loop of a DC-DC regulator, which makes it operating as a dynamic source or a dynamic load. The theoretical background and the practical implementation of the technique are investigated. Guidelines are provided to determine the static set-up and the bandwidth...
This paper presents a study of Operational Transconductance Amplifiers (OTAs) for voltage to current conversion circuits. The paper includes a comparative analysis of three OTA architectures implemented in 0.35µm CMOS AMS Technology under ± 1.65V power supply voltage. The impact of the OTA topology has been investigated by simulation. The designed OTAs managed to deliver large current values of 10mA...
In this paper project and measured characteristics of the laptop's power supply station with photovoltaic module are presented. This device consists of two switch-mode voltage regulators, photovoltaic module and the lead-acid battery. In the following sections step-down and step-up switch-mode voltage regulators are described and the measured by the author characteristics of voltage regulators and...
A 50 A, ±225 V current regulated bipolar power supply has been developed to energize the solenoid coil in atom cooling experiment. The power supply operates on 415 V, 50 Hz three-phase ac mains. Topology used is a two-quadrant asymmetrical half-bridge operating at 25 kHz. The main feature of this power supply is its ability to generate fast rising and falling current profiles of peak amplitude 50...
This work presents a novel current sharing control technique based on an improved droop control scheme for a modular power supply composed of n output parallel-connected DC-DC converters. Each converter is connected to the load through individual line resistance and modeled as a dependent voltage source. In order to provide proper load sharing, a voltage reference adjustment for the main control loop...
The modified emitter follower compensation circuit is discussed and the principle of a slop compensation circuit is also analyzed. Focusing on transformer primary side existing current peak when duty ratio of peak current-mode control power converter is higher than one half. Theoretical analysis shows that this circuit can eliminate the phenomenon of current peak, increased the range of the duty ratio...
This article discusses common circuit designs for power supplies used in spark erosion machines. The author proposes the use of a linear current source as a generator. Moreover, he presents several solutions of electronic controlled current sources based on an operational amplifier and a power Mosfet transistor. One of the solutions has been selected for further tests, including verification with...
This paper investigates a novel varying-frequency isolated drive power supply method using an isolation method to drive a primary side high-voltage circuit of a power supply by a secondary side PWM, while using a varying-frequency method as a control method to enhance effectiveness and efficiency. The control method mainly focuses on the importance of present power management and energy saving, so...
Resistance spot welding is the key metal joining technique for high volume production in the automotive, biomedical and electronics industry. Weld quality is one of the dominant issues for the welding community. Thus a major focus of the spot welding research has been to control the process to improve the consistency of the welding process. In order to improve the consistency of RSW, control of the...
A novel and simple structure for improving CMRR is introduced. This structure can be added to the circuits like folded cascode amplifier, telescopic amplifier, current buffers, .etc to improve the CMRR of these circuits. This simple and effective circuit uses common mode deviating technique to improve CMRR at least 12dB while preserves CMRR bandwidth which is a novel technique in order to improve...
The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage network is grounded with petersen coils or low...
This paper analyzes a voltage regulator with widely range of power supply which is essential module in switching mode power supply. It is composed of Pre-charging Circuit, Bandgap Reference Circuit, Current Reference Circuit, Thermal Protect Circuit and Low-dropout (LDO) regulator. A frequency compensation method with buffer stage isolation is utilized, that conduces to the improvements of transient...
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 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...
A CMOS low-dropout regulator (LDO) with high power supply rejection (PSR) characteristics is presented in this paper. By utilizing an optimized error amplifier, which feedforward the supply ripples into the gate of power transistor so as to maintain a constant gate-source voltage in power transistor under supply ripples, the proposed LDO provides high PSR capability. A prototype of the LDO has been...
A method of dry resistance load test of diesel locomotive is introduced. The electric power generated by a dynamotor, which is driven by the diesel, is converted to DC and consumed on the dry resistances. As the heat dissipation of the resistances is about several thousand kilowatts, DC motor fans are used for air cooling the resistances. In order to save energy, the energy for driven the motor fans...
In this paper, a simple method to design the current-sharing loop, together with the feedback loops, is presented for two power supplier paralleled. First of all, the proposed current-sharing loop is described in details. Next, in order to design the parameters of the voltage controller based on the given crossover frequency and phase margin, the corresponding small-signal model is introduced. According...
The implementation of complex functionality in low-power nano-CMOS technologies leads to enhance susceptibility to parametric disturbances (environmental, and operation-dependent). The purpose of this paper is to present recent improvements on a methodology to exploit power-supply voltage and temperature variations in order to produce fault-tolerant structural solutions. First, the proposed methodology...
In this work, the bulk-gate controlled circuit to improve the power supply ripple ratio (PSRR) of a Low Dropout Regulator (LDO) which deteriorates due to lowering power consumption is proposed. Designing with 0.25 mum CMOS process, the simulation results by HSPICE shown that the proposed circuit provides a high performance of PSRR even though 1/10 of the power consumption is reduced compare to the...
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