| 摘要 |
PURPOSE: A sMPS(switch mode power supply) drive circuit of PWM(pulse width modulation) type is provided to maximize an efficiency of the system by using a transformer, transistors, a resonance circuit section, and a control section. CONSTITUTION: A transformer(50) includes an Lp coil and La coil at the first side, and includes an Ls coil at the second side. A first transistor(Q1) is installed at the central portion which is opposite to the operation point which is set to Lp coil and La coil, and performs switch. A resonance circuit section(60) forms a resonance wave. A second transistor(Q2) is connected to the resonance circuit section(60) in series. A control section(A) controls the input signals of the first and second transistor(Q1,Q2).
|
