A kind of active clamp positive activation type switching power circuit

A kind of active clamp positive activation type switching power circuit

  • CN 107,196,515 A
  • Filed: 06/30/2017
  • Published: 09/22/2017
  • Est. Priority Date: 06/30/2017
  • Status: Active Application
First Claim
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1. a kind of active clamp positive activation type switching power circuit, including a transformer, the first N-channel FET, the first electric capacity,Second electric capacity a, clamp networks, the first diode, the second diode, the first inductance, transformer includes the first primary side winding, theTwo primary side windings and vice-side winding, clamp networks at least include anode and negative electrode, vice-side winding Same Name of Ends and the second diode sunPole is connected, and the second diode cathode is connected with the negative electrode of the first diode, one end of the first inductance simultaneously, the first inductance it is anotherEnd is connected with second electric capacity one end, and forms output just, anode, the second electricity of vice-side winding different name end simultaneously with the first diodeHold other end connection, and it is negative to form output;

  • The anode of input DC power simultaneously with the first primary side winding Same Name of Ends, clamp networksNegative electrode be connected, the first primary side winding different name end is connected with the drain electrode of the first N-channel FET;

    The anode of clamp networks andTwo primary side winding different name ends are connected, and the source electrode of the first N-channel FET connects the second primary side winding Same Name of Ends, and tie point is simultaneouslyConnect the negative terminal of input DC power;

    The grid connection driving control signal of first N-channel FET;

    First primary side winding andSecond primary side winding is Double-wire parallel wound, and one end of the first electric capacity is connected with the first primary side winding different name end, the first electric capacity it is anotherEnd is connected with the second primary side winding different name end, it is characterised in that:

    Clamp networks at least include the 3rd electric capacity and the second N-channel effectYing Guan, the 3rd described electric capacity and described the second N-channel FET series connection, series system is one of following two modes:

    (1) one end of the 3rd electric capacity described in is the negative electrode of described clamp networks, and the other end of the 3rd described electric capacity is connectedThe drain electrode of the second described N-channel FET, the source electrode of the second described N-channel FET is described clamp networksAnode, the grid of the second described N-channel FET connects clamp control signals;

    (2) one end of the 3rd electric capacity described in is the anode of described clamp networks, and the other end of the 3rd described electric capacity is connectedThe source electrode of the second described N-channel FET, the drain electrode of the second described N-channel FET is described clamp networksNegative electrode, the grid of the second described N-channel FET connects clamp control signals;

    First described N-channel FET each cycle is open-minded, described the second N-channel FET in active clamp justExcitation type switch power-supply is close to full load, and each cycle is open-minded;

    The second described N-channel FET is in active clamp positive activation typeJust open-minded every m cycle during Switching Power Supply underloading, m is positive integer, and the load of active clamp positive activation type Switching Power Supply is lighter, m'"'"'sValue is bigger.

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