Switch mode power supply

Switch mode power supply

  • CN 1,048,122 C
  • Filed: 02/13/1991
  • Issued: 01/05/2000
  • Est. Priority Date: 02/15/1990
  • Status: Active Grant
First Claim
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1. switch mode power that has a transformer (Tr), this transformer contains an elementary winding (W1) and a secondary winding,This elementary winding (W1) and a switching transistor (T1) are connected in series, and this switching transistor is according to the requirement that the lotus duty cycle is arranged and conducting, so that charge for this transformer (Tr) through this elementary winding (W1),This secondary winding provides charging current (iD) for a charging capacitor (4) through a diode (D1), so that produce operating voltage (U5),A transistor (T2), (D1) is in parallel with described diode, Be Controlled gets and can just be switched on after described switching transistor (T1) is cut off according to the requirement of described operating voltage (U5), and by means of oppositely going up the reverse charging electric current (iT2) that flows at this charging capacitor (4), give this transformer (Tr) with energy backIn this primary side, can obtain relevant with described energy and the therefore control voltage (Ur) relevant with the operating voltage (U5) of primary side, in order to what control this switching transistor (T1) the lotus duty cycle arranged,It is characterized in that:

  • A RCD attenuator (3), it contains a capacitor, a resistor and a diode, and is connected in parallel with described elementary winding, in order to the edge steepness of restriction peak value of pulse and the voltage that presents on described switching transistor (T1), and produce an oscillating voltage (U2), andControl voltage (Ur) on described primary side is to obtain from the described oscillating voltage (U2) that described reverse charging electric current (iT2) is responded to.

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