Switched constant current driving and control circuit

Switched constant current driving and control circuit

  • CN 101,010,649 B
  • Filed: 06/23/2005
  • Issued: 10/30/2013
  • Est. Priority Date: 06/30/2004
  • Status: Active Grant
First Claim
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1. driving and opertaing device that is used for providing to the load of the string that comprises one or more electron devices the switching current of expectation, described equipment comprises:

  • A) be suitable for being connected to the electric pressure converter of power supply, described electric pressure converter is used for and will becomes the second amplitude voltage from the first amplitude voltage transitions from the voltage of power supply, and described electric pressure converter is in response to control signal;

    B) light controller, described light controller receive described the second amplitude voltage and control described the second amplitude voltage to the transmission of described string, thereby control enabling of described string;

    C) voltage detection device and current detecting equipment, described voltage detection device are electrically connected to the output of described electric pressure converter to produce first signal, and described current detecting equipment connects to produce the secondary signal that the electric current of described string is flow through in expression with described string;

    AndD) feedback device, described feedback device is electrically connected to described electric pressure converter, described voltage detection device and described current detecting equipment, described feedback device receives described the first and second signals and provides control signal to electric pressure converter, and described control signal is based on described the first and second signals;

    Wherein said electric pressure converter changes described the second amplitude voltage based on the control signal that receives from described feedback device, and wherein said light controller is arranged to and receives a dimming control signal, and described light controller is controlled described the second amplitude voltage to the transmission of described string in response to described dimming control signal;

    Wherein said feedback device also comprises in response to the dutycycle of described dimming control signal by the switch of digital input signals control, described switch is configured to when the dutycycle of described dimming control signal is lower than predetermined threshold, is activated in order to described first signal is connected to described electric pressure converter.

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