switching power supply topologies

... converter The design of the switching power supply requires many features such as: Lower input current harmonics to meets the IEC 1000-3 harmonic limits High input power factor to minimize reactive ... II Analog and Digital Control Traditionally, the implementation of switching power supply has been accomplished by using analog power factor correction (PFC) as shown in Fig [3] Analog PFC IC's ... controller can guarantee higher bandwidth and higher switching frequency for ac/dc power supply References [1] Jigna Patel, "The Hottest Markets for External Power Supplies Now ans a Look at Potential...

Ngày tải lên: 27/10/2013, 16:15

Ngày tải lên: 10/04/2014, 19:55

... to build the switching supply becomes less than the linear supply at the higher power levels 1 Why Use Switching Power Supplies? All of these advantages make the switching power supply a much ... Control Section 14 CHAPTER Switching Power Supply Topologies I7 4.1 Factors Affecting the Choice of an Appropriate Topology Non-Transformer-Isolated Switching Power Supply Topologies 20 17 Contents ... Configuration CHAPTER Semiconductors Used in a Switching Power Supply 43 5.1 Bipolar Power Transistors 43 5.2 PowerMOSFETs 50 5.3 Rectifiers 56 5.4 Switching Power Supply Control Integrated Circuits 5.4...

Ngày tải lên: 18/04/2014, 12:25

... 257 258 259 xv xvi Switching Power Supply Design 6.6 Low Output Power “Housekeeping” or “Auxiliary” Topologies Introduction 6.6.1 Housekeeping Power Supply on Output ... logic circuit design using transistors and switching power supply design, respectively Mr Pressman was the author of the first two editions of Switching Power Supply Design Keith Billings is a Chartered ... for Switching Power Supply Techniques Power Factor and Power Factor Correction Power Factor—What Is It and Why Must It Be Corrected? 15.2 Power Factor...

Ngày tải lên: 08/08/2014, 06:20

... PIC16HV785 with an on-chip 5V shunt regulator for powering the microcontroller and associated circuitry So, the power conversion section of the power supply design is comprised of the two feedback ... MPLAB Certified logo, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total ... 0)) state2 = SHUTDN; break; case FAULT: POWERGOOD = 0; FAULTLED = 1; if ((!ENABLE) & (monitor[3] < lowSupply)) state2 = SHUTDN; break; case ERROR: default: POWERGOOD = 1; FAULTLED = 1; if (monitor[0]...

Ngày tải lên: 11/01/2016, 16:38

... the power supply topology should be buck, boost or buck-boost type Factors (b) and (c) determine whether or not the power supply topology should have a transformer Reliability of the power supply ... advanced power topologies, which reduce switching losses at higher frequencies CR VIN IMPROVEMENT TECHNIQUES To develop SMPS with high efficiency and high switching frequencies, and to achieve high power ... period, thereby reducing the switching losses In a power MOSFET, zero voltage switching is preferred as compared to zero current switching Therefore, the operating switching frequency, more than...

Ngày tải lên: 17/05/2015, 15:33

... the dissipated power EQUATION 25: I Q, av = I O, av, nom D EQUATION 28: P Q1, static, T MOSFET Power Losses Computation Static Dissipation Figure 10 illustrates what occurs during switching There ... this depicted situation is considered the current switching event Therefore, at turn-on the power is equal to Equation 29 EQUATION 26: ON = Switching Dissipation During TON, the average current ... = T SW EQUATION 31: T SW P Q1, switching, turnon = V DC I O, av, nom T At turn-off the switching loss can be calculated using Equation 32 EQUATION 32: P Q1, switching, turn – off = 1 = ∫...

Ngày tải lên: 17/05/2015, 15:33

... trực tuyến để tìm số cần thiết ví dụ như: - http://www.jscustompcs.com /power_ supply/ - http://www.mymp3car.com/MP3Car/PSUpower.asp Trong thực thế, Khi đem hệ thống thuộc dạng mạnh đưa thử nghiệm ... thiết bị với tổng công suất khoảng 430w vào nguồn có số Continuous Power 400w, chúng hoạt động khoảng thời gian ngắn mức Peak Power nguồn đạt 430w sau khoảng thời gian định, linh kiện nguồn bị ... ±10% -10.8V -13.2V +3.3VDC ±5% +3.14V +3.47V +5V SB ±5% +4.75V +5.25V 12 Chế độ Soft Power tín hiệu chờ 5v: Soft Power cách thức mà nguồn máy tính bật lên tắt Thay sử dụng công tắc cứng chuẩn AT...

Ngày tải lên: 01/11/2012, 16:38

... máy tính Bước Một lý cho việc PSU không hoạt động bạn chưa cắm đầu power switch Đầu power switch, thường đóng dấu PW PW_ON hay POWER SW, từ phía trước thùng máy đến mainboard Tuy nhiên, trường ... thử tắt máy khởi động lại Nếu máy khởi động lần thử thứ hai thứ ba tín hiệu Power_ OK (hoặc Power_ Good) Khi có tín hiệu Power_ OK, mainboard hiểu PSU ổn định, không mainboard không khởi động để tự ... cắm dễ bị bung ra) Vị trí cắm power switch in mainboard, bạn tham khảo tài liệu kèm với mainboard không tìm thấy chân cắm Bước Bạn khởi động cách chập hai chân nút power switch mainboard tua-vít,...

Ngày tải lên: 27/04/2013, 11:36

... reduced TABLE I TURN-ON AND TURN-OFF SWITCHING LOSSES III HIGH REPETITION PULSED POWER SUPPLY A Pulsed Current in High Repetition This switch can be applied to a power supply which supplies high-speed ... semiconductor devices, and the switching loss is generated However, this magnetic energy recovery switch achieves zero voltage switching and zero current switching so that the switching loss is reduced ... In order to confirm this, switching loss of a magnetic recovery switch and hard switching was compared Fig shows turn-off waveforms of one MOSFET element in this switch Switching frequency is kHz...

Ngày tải lên: 15/10/2013, 16:11

... ) f osc ΔVrms (Vi + Vo ) f osc H Chan; Mohawk College 48 Basic Push-Pull Power Converter Push- Operates as a class D power amplifier Output rectifier converts the square-wave to dc Each transistor ... Half-Bridge Power Converter Half- Each transistor “sees” approx Vin Full flux reversal in the transformer and capacitors across DS prevent voltage spikes H Chan; Mohawk College 50 Basic Full-Bridge Power ... Minimum output voltage is Vreg instead of V IQ is relatively large and varies from chip to chip chip Power dissipation in R2 can in some cases be quite large resulting in bulky and expensive equipment...

Ngày tải lên: 13/12/2013, 23:15

... the local power requirements when selecting the voltage for the power supply Step Power supplies are rated by wattage, which is usually between 250 and 300 watts What is the power supply rating ... mini DIN _ USB (Make sure it matches the connector on the Motherboard) Power Supply AT ATX _ Other _ Power Supply Wattage _ Step Examine the screws that will be used for the case ... Lab 3.3.4 Copyright  2002, Cisco Systems, Inc Step Most computer cases come complete with a power supply However, not all cases are built for the United States market and therefore may not be...

Ngày tải lên: 21/12/2013, 19:15

... uninterruptible power supplies,” in Proc 37th Annu North Amer Power Symp., Oct 23–25, 2005, pp 159–164 [3] H Pinheiro and P Jain, “Comparison of UPS topologies based on high frequency transformers for powering ... UNINTERRUPTIBLE POWER SUPPLY BASED ON Z-SOURCE INVERTER 3001 TABLE IV STEP RESPONSE OF THE OUTER LOOP TABLE V SPECIFICATIONS OF A 3-KW UPS WITH THE Z-SOURCE INVERTER than the system switching frequency, ... of inductor L1 (or L2 ) over one switching period in steady-state operation is zero (uB − uC )T1 + uC T0 = (6) ZHOU et al.: SINGLE-PHASE UNINTERRUPTIBLE POWER SUPPLY BASED ON Z-SOURCE INVERTER...

Ngày tải lên: 03/01/2014, 19:12

... distribution system Electrical power supply 2.4 2.5 Power supply functions Power supply to the control circuit b Power unit supply The table (C Fig 5) summarises the power units and functions covering ... zones of influence 2 Electrical power supply 2.4 2.4 Power supply functions Power supply functions There are three separate functions: b Supply and cut off the machine power and control units with ... 2 Electrical power supply Summary 2.1 Introduction Page 2.2 Power supply to machinery Page 2.3 Standards and conventions Page 2.4 Power supply functions Page 2.5 Power supply to the control...

Ngày tải lên: 15/02/2014, 08:33

... Power Rating The power rating of a power supply is most often referred to as its wattage You can usually tell the power rating of a PSU just by looking at its model number; for example, the power ... the more efficient the power supply is the less AC power it requires to provide sufficient DC power, meaning lower overall power consumption from the mains and a smaller power bill The earth will ... can see, a power supply is most efficient at around 50% load; that is to say, this power supply is at its most efficient when providing 275W of power to components The vast majority of power supplies...

Ngày tải lên: 19/03/2014, 20:35

... to Switching Power Supply Design Figure 3–6 Design flow for a PWM switching power supply 27 28 Pulsewidth Modulated Switching Power Supplies Figure 3–7 The functional block diagram for a PWM switching ... diagram for a PWM switching power supply 3.3 Which Topology of PWM Switching Power Supply to Use? A major decision that must be considered at the beginning of a switching power supply design is which ... of the power components within the switching power supply design This arrangement has a large bearing on which environment the supply can operate in safely and how much power the power supply...

Ngày tải lên: 18/04/2014, 12:28

... DIGITALLY CONTROLLED SWITCH MODE POWER SUPPLY Fig Conventional telecommunication switch mode power supply [1] Fig 125 Proposed digitally controlled switch mode power supply based on matrix converter ... converter in telecommunication power supplies REFERENCES [1] Tyco Electronics, “Galaxy Switchingmode Rectifier 595 Series,” Tech Rep., Feb 2003 [2] A I Pressman, Switching Power Supply Design New York: ... Lecturer at Mahidol University Her research interests include ac/ac power converter, switch mode power supply, power quality, and power electronic applications Han Ju Cha received the B.S degree...

Ngày tải lên: 13/05/2014, 00:55

... UPS (Uninterruptible Power Supply) hay lưu điện thiết bị cung cấp điện khoảng thời gian tương ứng với công suất thiết kế...

Ngày tải lên: 29/06/2014, 18:20

... Ballasts, Power Supplies, Uninterruptible Power Supplies, Automotive Applications of Power Electronics, Solar Power Conversion, Power Electronics for Renewable Energy Sources, Fuel-cell Power Electronics ... led to the development of power electronic dc–dc conversion circuits for power supplies In a well-designed power electronics arrangement today, called a switch-mode power supply, an ac source from ... This type of supply brings an interesting dilemma: the ac line cord to plug it in takes up more space than the power supply itself Innovative concepts such as integrating a power supply within...

Ngày tải lên: 02/07/2014, 20:20