This paper proposes, a two-stage variable bus voltage high-voltage capacitor charging power supply technical scheme which adds a one-stage totem-pole bridgeless power factor correction (PFC) circuit on the basis of the half-bridge LLC resonant circuit, and solves the problem of the decline in charging efficiency caused by the excessive operating frequency variation range of
This paper presents a different magnetic parts design and manufacturing techniques of power supplies, design and selection criteria of switching elements as well as the optimal design of...
By separating the transformation and regulation function of a dc-dc power converter into two
Furthermore, this paper presents comprehensive analyses, comparisons, and
In this article, a novel two-stage pulsed power supply is proposed. The intermedia bus
Aiming at the power supply scheme (PSS) of the on-board supercapacitor-powered tram, considering the cost and margin of the PSS, a two-stage method is designed to optimize the layout of the charging
Fig. 3. Example of the switched-capacitor transformation stage circuit coupled with a fast regulating stage which provides soft charging of the switched-capacitor stage. associated with capacitor charging. The auxiliary converter may be the regulating converter used to supply the output, or it may be a separate converter. The system is designed
To reduce the storage capacitor, in this paper, a two-stage PPS with small capacitor and ultra-fast dynamic response is proposed. Two feedforward control loops imposing on the front-end and rear-end stages respectively are proposed to achieve the ultra-fast dynamic response. The design of the key components in the PPS is also introduced
It has been shown that in many applications an appropriately filtered switching converter can replace a linear regulator for production of a low noise supply. Even in those demanding applications where an extremely low noise supply is required, there is probably a switching circuit somewhere upstream in the power tree. Therefore, there is a
PFC solutions and compare these solutions with the basic two-stage PFC solution. I. INTRODUCTION Numerous single-stage and reduced power processing topologies have been presented in the literature predicting higher efficiency and/or lower cost. But very seldom these predictions are verified.
2.1 Topology of pulsed power supply. The typical topology of a non-isolated switching-pulsed power supply is shown in Fig. 1, which consists of a front-end voltage source Vdc, DC-link capacitors C, IGBT modules S1-S4, and a resistance-inductance load R–L.The front voltage source provided a DC voltage that satisfied the power and voltage ripple requirements
This paper presents the conception and analysis of a switch-mode power supply (SMPS) with desirable characteristics of high-frequency isolation, high input power factor, low harmonic distortion, and high efficiency. Nearly unity input power factor can be obtained by using an interleaved boost converter associated with a nondissipative snubber, as high efficiency of
By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high control bandwidth can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages.
In this article, a novel two-stage pulsed power supply is proposed. The intermedia bus capacitance is used as the storage capacitor to balance the power. An interleaved half-bridge converter with a wide voltage gain is adopted, so that the voltage of the storage capacitance can vary in a wide range, which greatly reduces the value of the
The semi-two-stage compensator achieves better compensation performance and less decoupling capacitor than the single-stage circuit while has higher efficiency and lower converter power rating
The specification of the power supply often states the lifetime of these electrolytic capacitors as a metric of quality. This article will discuss well-known effects upon electrolytic capacitors and their importance for a power supply design. An electrolytic capacitor is a type of capacitor which use electrolyte in its internal construction
A merged two-stage conversion architecture includes a switched capacitor first stage that provides voltage pre-regulation and transformation, and a high-frequency magnetic stage that provides fine regulation of the output.
This paper presents a different magnetic parts design and manufacturing techniques of power supplies, design and selection criteria of switching elements as well as the optimal design of...
In this paper we study the complete two-stage PFC power supply and show that the interaction between the PFC stage and the dc/dc converter stage plays an important role in determining the stability of the system.
A merged two-stage conversion architecture includes a switched capacitor first stage that
LECTURE 180 – POWER SUPPLY REJECTION RATIO (READING: GHLM – 434-439, AH – 286-293) Objective The objective of this presentation is: 1.) Illustrate the calculation of PSRR 2.) Examine the PSRR of the two-stage, Miller compensated op amp Outline • Definition of PSRR • Calculation of PSRR for the two-stage op amp • Conceptual reason
The single-stage method reduces the 48-V power source to the load voltage by using a single power supply. The two-stage method reduces the source voltage to an intermediate voltage and then to the load voltage. (Fig. 6)
Furthermore, this paper presents comprehensive analyses, comparisons, and experimental findings to demonstrate the converter''s fault-tolerant capability. The multi-objective optimization approach offers a practical and effective strategy for optimizing switching power supplies for efficiency and reliability. 1. Introduction.
step-up power stage. Power supply designers choose the boost power stage because the required output voltage is always higher than the input voltage, is the same polarity, and is not isolated from the input. The input current for a boost power stage is continuous, or non-pulsating, because the input current is the same as the inductor current
To reduce the storage capacitor, in this paper, a two-stage PPS with small capacitor and ultra
In this paper we study the complete two-stage PFC power supply and show that the interaction
PFC solutions and compare these solutions with the basic two-stage PFC solution. I.
The capacitor power losses are omitted in this study due to the low power loss of the capacitor and the fact that the π T for capacitors is only related to ambient temperature. According to junction and hot spot temperature equations, it can be concluded that higher power loss yields higher T j and T C temperatures which directly increases the value of the
When the SC stage is configured to charge capacitors C1 and C2 in series (switches S closed), the capacitors are charged at a rate determined by the power drawn from the regulating stage, ensuring soft charging operation.
The comparative study shows an efficiency advantage of the two-stage scheme. Finally, a prototype with the output peak power of 2 kW, the average power of 325 W, and the pulse repetition frequency of 150-300 Hz is assembled and tested to verify the validity of the proposed two-stage pulsed power supply and its control methods.
To balance the power difference and maintain a constant output voltage, the value of the storage capacitance is usually very large. In this article, a novel two-stage pulsed power supply is proposed. The intermedia bus capacitance is used as the storage capacitor to balance the power.
The switched capacitor pre-regulator / transformation stage is comprised of two energy transfer capacitors and eight switches, and provides nearly continuous input and output currents. The fixed frequency 50% duty ratio gate signal is generated in the microcontroller, and the proper conversion mode is selected depending on the input voltage level.
For each input and output part for the 1st and 2nd stages of the 48-V power supply, appropriate Panasonic capacitors are shown below. (Fig. 2, Table 2) Supporting low cost and large capacitor (Concern exists for temperature characteristics and capacity deterioration caused by liquid electrolyte).
The single-stage method reduces the 48-V power source to the load voltage by using a single power supply. The two-stage method reduces the source voltage to an intermediate voltage and then to the load voltage. (Fig.
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