Switching Power Supply Design

Switching power supply design should meet the technical performance indicators: output / input voltage ratio (UO / UI), the output power PO converter efficiency eta, output voltage ripple △ UO input voltage source voltage Ui electromagnetic interference ( EMI) amplitude limit. During the optimization design, the inequality constraints to represent the performance indicators (to meet a certain inequality constraints, which means that the design results to meet a performance index).

The main circuit of the switching power supply design, should be calculated and selected main content: select the main circuit structure, selection switch (transistor, power MOSFET or IGBT) and model of the rectifier diode voltage and current specifications to determine the form and parameters of the input and output filters; calculate the core specification of the magnetic components (inductors, transformers, current transformers, etc.), the size of the windings, and the specifications of the wire, as well as the selection of the capacitor.

Switching power supply control circuit compensation network should be designed to meet the transient performance indicators of the power supply, so it is a transient design. Switching power supply transient performance indicators are: the stability of the power system, fast (recovery time) on overshoot and undershoot transient response, power disturbance (of disturbance including input voltage transient disturbance, the load transient perturbation of a sudden or sudden load reduction). The main circuit parameters and switching power supply transient response performance has greatly transient design should be carried out after the completion of the main circuit design.

The main contents include: the optimal design of switching power supply transient select the feedback control mode (voltage feedback voltage, current feedback, called single-loop to control and bicyclic control) compensation network (that is, the proportion integral differential or PID amplifier) circuit form, the optimal design of PID parameters.



Posted by novaking at 2013年04月10日11:44
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