Tài liệu Power Supply Block Diagram ppt

... Block Diagram of SwitchBlock Diagram of Switch Mode RegulatorMode Regulator It converts an unregulated dc input ... causing current to flow through C and D. Basic PushBasic Push Pull Power ConverterPull Power Converter Operates as a class D power amplifier. Output rectifier converts the sq are a e to dc Each ... current. o I V AmVregulationLoad Δ Δ =)/( L I g Δ )( V 100 Δ oL o V...

Ngày tải lên: 13/12/2013, 23:15

... PCU output power. When the PCU output power reaches a maximum level, the input resistance is fixed at the value that produces this level. Presumably when output power is a maximum, input power is ... maximum power from the array. This is done by incorporating maximum power- tracking circuitry into the PCU. Figure 18.4 shows the I – V characteristics of an array with the max...

Ngày tải lên: 13/12/2013, 00:15

... to active power filters, because the term active power filters is misleading to either active filters for power or filters for active power. Therefore, this section takes the term active filters for power ... various power quality events. The IEEE Emerald Book (IEEE Standard 1100-1999, IEEE Recommended Practice for Power and Grounding Electronic Equipment ) defines power quality...

Ngày tải lên: 13/12/2013, 00:15

... multilevel inverter, IEEE Trans. Power Electron., 14, 1037, 1999. 30. Yuan, X. and Barbi, I., Zero-voltage switching for three-level capacitor clamping inverter, IEEE Trans. Power Electron., 14, 771, ... associations, IEEE Trans. Power Electron., 15, 92, 2000. 37. Masukawa, S. and Iida, S., A method of reducing harmonics in output voltages of a double-connected inverter, IEEE Trans. Po...

Ngày tải lên: 25/01/2014, 13:20

... 1.5 kW, it is advisable to use a higher power supply. In some applications, two of the three phases of a three-phase power system are used as the source powering the rectifier of Fig. 4.11 The ... the same power capacity. The advantages of DC transmission over AC should not be misunderstood and DC should not be considered as a general substitute for AC power transmission. In a power...

Ngày tải lên: 25/01/2014, 13:20

... converter. V i a i a1 ω 1 t ω 1 t α n φ 1 n inverter p inverter p and n blocked p and n blocked p rectifier n rectifier n blocked p blocked α p V a V a 1 i Nine independent bidirectional switches Load (variable voltage and variable frequency) R S T c b a (60 ... this period the other converter is blocked. When the current changes direction, both converters must be blocked for a shor...

Ngày tải lên: 25/01/2014, 13:20

... CRC Press LLC 1.5 Power Bipolar Junction Transistors Sohail Anwar Power bipolar junction transistors (BJTs) play a vital role in power circuits. Like most other power devices, power transistors ... applications such as motor drives, uninterrupted power supplies, static VAR compensators, and high power active power line conditioners. The current and future power semiconductor...

Ngày tải lên: 25/01/2014, 13:20

... the output when the main power switch is off. Its voltage drop is primarily responsible for power dissipation. If V d is the on-state voltage drop of the diode, then its power dissipation is expressed ... popular power stage used in off-line (110 V AC or 220 V AC ) applications, particularly with multiple output voltages. Power diodes, capacitors, and windings on the two-winding i...

Ngày tải lên: 25/01/2014, 13:20

... F.G.Turnbull; Power electronic control of AC motors, Oxford: Pergamon Press, 1988. [3] B.K.Bose; Power electronics and AC drives, Englewood Cliffs: Prentice-Hall, 1986. ENGNG3070 Power Electronics ... Nowadays, semiconductor switching frequencies are for major part of the power region in the kHz region. Typically, for small to medium powers, inverter switching frequency is of the orde...

Ngày tải lên: 26/12/2013, 01:17

... in all directions. The power of a transmitter that is radiated from an isotropic antenna will have a uniform power density (power per unit area) in all directions. The power density at any distance ... intensity of isotropic antenna with same power input Power density from an isotropic antenna ' P D ' P t 4BR 2 where: P t ' Transmitter Power R ' RangeFromAnten...

Ngày tải lên: 22/01/2014, 11:20