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Voltage regulator, operation method thereof, voltage regulating system, and mobile vehicle

  • US 9,748,881 B2
  • Filed: 04/07/2014
  • Issued: 08/29/2017
  • Est. Priority Date: 06/05/2013
  • Status: Active Grant
First Claim
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1. A voltage regulator, coupled to an alternator and a battery, the alternator having a first output terminal, a second output terminal and a third output terminal, the voltage regulator comprising:

  • a voltage detection unit having a voltage detection terminal couple to the third output terminal of the alternator, the voltage detection unit coupled to the battery through a power terminal, the voltage detection unit operatively detecting a voltage level of a phase signal outputted by the third output terminal of the alternator and generating an enable signal; and

    a startup assisting unit coupled to the voltage detection unit, a rotor coil(131) of the alternator, and the battery;

    the startup assisting unit receiving a supplying voltage from the battery and operatively generating a first exciting current responsive to the enable signal for exciting the rotor coil;

    wherein when the voltage detection unit detects that the voltage level of the phase signal outputted by the third output terminal is greater than a predetermined voltage threshold, the voltage detection unit outputs the enable signal to cause the startup assisting unit to generate the first exciting current to the rotor coil of the alternator, so that the alternator is able to establish voltage under low rotational speed;

    wherein the startup assisting unit comprises;

    a first resistor, the first terminal of the first resistor being coupled to the battery;

    a second resistor, the first terminal of the second resistor being coupled to the battery and the second terminal of the second resistor being coupled to the voltage detection unit;

    a current amplifying unit having an input terminal, an output terminal and a control terminal, the input terminal being coupled to the second terminal of the first resistor, the output terminal being coupled to the rotor coil of the alternator, and the control terminal being coupled to the voltage detection unit to receive the enable signal; and

    a first diode, an anode thereof being coupled to the output terminal of the current amplifying unit, and an cathode thereof being coupled to the rotor coil of the alternator;

    wherein the current amplifying unit generates the first exciting current according to the enable signal.

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