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  • AN117 Basic Bridge Circuits
    Bridge circuits have been in use for well over 150 years. To date, the bridge is still the most economical circuit technique for accurately measuring resistance. The original bridge circuit topology has had many unique modifications and has been applied to applications such as AC measurements
  • Controlling 3-Phase AC Induction Motors Using the PIC18F4431
    than the PIC18F452 or PIC16F7X7. Practically speaking, control of a 3-phase AC induction motor requires pulse-width modulated control of the six switches of a 3-phase inverter bridge connected to the motor's stator windings (Figure 1). The six switches form 3 pairs of "half-bridges", which can
  • A New Solution for Harmonics Generated by Variable Speed Drives (.pdf)
    to enhance the conversion of ac power to dc power within a VSD or other equipment with a 3-phase, 6-pulse diode bridge rectifier front-end.
  • Brushless DC Motor Control Using PIC18FXX31 MCUs
    A PICDEM TM MC demo board was used to develop, test and debug the motor control code. The PICDEM MC has a single-phase diode bridge rectifier, converting AC input to DC and a power capacitor bank that keeps a stable DC bus. A 3-phase IGBT-based inverter bridge is used to control the output voltage
  • Phase Control Using Thyristors (.pdf)
    . The thyristor is held in the off condition - that is, all current flow in the circuit is blocked by the thyristor except a minute leakage current. Then the thyristor is triggered into an "on" condition by the control circuitry. For full-wave AC control, a single triac or two SCRs connected in inverse
  • Offline UPS Reference Design Using the dsPIC DSC (.pdf)
    (steps up the DC battery voltage to a constant high-voltage DC) 2)Full-Bridge Inverter (converts DC voltage to a sinusoidal AC output) 3)Flyback Switch Mode Charger (current source and charges battery with constant current)
  • Switching-Regulated Power Supplies
    drives the load. The switching transistor turns on and off rapidly, producing a chopped dc voltage. The chopped dc voltage is fed to a transformer which converts the pulsating dc to high-frequency ac. This ac is then fed to a second bridge rectifier which produces the final dc output. A sensing
  • Introduction
    method or potential theory. QuickField is a window-based, Finite Element Method (FEM) software package that supports Electrostatics, DC and AC conduction, Magnetostatics, AC and Transient Magnetics, Steady State and Transient Heat Transfer and Stress Analysis problem types. Models are created

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