Switching Power Supply is the use of modern power electronics, control transistors switch on and off the opening time rate, to maintain a stable output voltage power supplies, switching power supply from the general pulse width modulation (PWM) control IC and power switching devices (such as MOS-FET ), And so constitute. In simple terms: the switch-DC power supply. Switching power supply or DC power to AC power through it will be a stable DC voltage source. It has high efficiency and output voltage stability, exchange ripple small, small size and light weight of the many advantages.
In the design, to produce circuit TL494 as a PWM output control signals, control of the on-switch situation, the half-bridge flyback output on the basis of the power of multi-output.
Key words: switching power supply; flyback output; PWM Generation Circuit; power switch