A switch-over type control device for output power compensation

A switch-over type control device for output power compensation

CN
  • CN 1,964,172 A
  • Filed: 11/09/2005
  • Published: 05/16/2007
  • Est. Priority Date: 11/09/2005
  • Status: Active Application
First Claim
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1. , a kind of switching control device of output power back off is installed in the power supply unit, is coupled to a magnetic device by a power switch, controls this power switch and switches this magnetic device, to produce a primary side switch current, it is characterized in that, includes:

  • One oscillator is exported a pulse signal;

    One wave generating unit is connected in this oscillator, receives this pulse signal, in order to export a power limit signal;

    One impedance unit is connected in this wave generating unit, in order to determine the slope value of this power limit signal;

    One comparing unit, be connected in one in this power supply unit and detect resistance, a pressure feedback port and this wave generating unit, receive a current sensing signal, a voltage feedback signal and this power limit signal respectively, in order to export a reset signal, when this current sensing signal was this power switch conducting, this primary side switch current detected ohmically pressure drop at this;

    AndOne output unit is connected in this comparing unit, this oscillator and this power switch, receives this reset signal and this pulse signal, in order to export a drive signal to this power switch.

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