Soft start rectifier for a power supply unit
AssigneeDell Products L.P.
InventorEDWARD DOUGLAS KNAPTON
Life of this patent
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Abstract
A power supply unit (PSU), including: an active bridge rectifier, including: a plurality of field effect transistors (FETs); and a controller connected to each of the FETs; a power source connected between first and second terminals of the active bridge rectifier; and a capacitor connected between third and fourth terminals of the active bridge rectifier, wherein in a charging state: the controller performs, at a first time, zero-crossing detection of voltage of a power signal from the power source at the first and the second terminals, and in response, provides a first control signal to each of the FETs to enable each of the FETs for a fraction of a phase of current of the power signal such that the capacitor is charged during the fraction of the phase by the power signal.
Claims20
A power supply unit (PSU), including:
- an active bridge rectifier, including:
- a plurality of field effect transistors (FETs);
- and
- a controller connected to each of the FETs;
- a power source connected between first and second terminals of the active bridge rectifier;
- and
- a capacitor connected between third and fourth terminals of the active bridge rectifier,
- wherein in a charging state:
- the controller performs, at a first time, zero-crossing detection of voltage of a power signal from the power source at the first and the second terminals, and in response, provides a first control signal to each of the FETs to enable each of the FETs for a fraction of a phase of current of the power signal such that the capacitor is charged during the fraction of the phase by the power signal.
A power supply unit (PSU), including:
- an active bridge rectifier, including:
- a plurality of field effect transistors (FETs);
- and
- a controller connected to a respective gate terminal each of the FETs;
- an alternating current (AC) power source connected between first and second terminals of the active bridge rectifier;
- and
- a capacitor connected between third and fourth terminals of the active bridge rectifier,
- wherein in a charging state:
- the controller performs, at a first time, zero-crossing detection of voltage of an AC power signal from the AC power source at the first and the second terminals, and in response, provides a first control signal to each of the FETs to control a pulse width of a gate voltage of each of the FETs for a fraction of a phase of current of the AC power signal such that the capacitor is charged during the fraction of the phase by the AC power signal.
A power supply unit (PSU), including:
- an active bridge rectifier, including:
- a plurality of field effect transistors (FETs), including a first FET, a second FET, a third FET, and a fourth FET;
- and
- a controller connected to a respective gate terminal each of the FETs;
- an alternating current (AC) power source connected between first and second terminals of the active bridge rectifier;
- and
- a capacitor connected between third and fourth terminals of the active bridge rectifier,
- wherein the first terminal is positioned between the first FET and the fourth FET;
- the second terminal is positioned between the second FET and the third FET;
- the third terminal is positioned between the first FET and the second FET;
- and the fourth terminal is positioned between third FET and the fourth FET
- wherein in a charging state:
- the controller performs, at a first time, zero-crossing detection of voltage of an AC power signal from the AC power source at the first and the second terminals, and in response, provides a first control signal to each of the FETs to control a pulse width of a gate voltage of each of the FETs for a fraction of a phase of current of the AC power signal such that the capacitor is charged during the fraction of the phase by the AC power signal,
- wherein the fraction of the phase of current of the power signal is based on a magnitude of a capacitance of the capacitor.
Dependencies are inferred from the claim text.