Circuit for limiting inrush current to a power source

An electrical power supply system comprising:

• a power source;
• a low voltage drop semiconductor device coupled to the power source;
• a resistor coupled in parallel with the low voltage drop semiconductor device;
• a diode coupled in parallel with the resistor;
• and
• an AC detector coupled to the low voltage drop semiconductor device wherein the AC detector controls the low voltage drop semiconductor device in a manner such that when power is applied to the power source the inrush current to the power source is minimized.

A circuit for limiting an inrush current to a power source comprising:

• an insulated-gate bipolar transistor coupled to the power source;
• a resistor coupled in parallel with the an insulated-gate bipolar transistor;
• a diode coupled in parallel with the resistor;
• and
• an AC detector coupled to an insulated-gate bipolar transistor wherein the AC detector controls an insulated-gate bipolar transistor in a manner such that when power is applied to the power source the inrush current to the power source is minimized.

A circuit for limiting an inrush current to a power source comprising:

• a silicon-controlled rectifier coupled to the power source;
• a resistor coupled in parallel with the silicon-controlled rectifier;
• a diode coupled in parallel with the resistor;
• and
• an AC detector coupled to the silicon-controlled rectifier wherein the AC detector controls the silicon-controlled rectifier in a manner such that when power is applied to the power source the inrush current to the power source is minimized.

A circuit for limiting an inrush current to a power source wherein the power source comprises a rectifier bridge, an inductor coupled to the rectifier bridge and a pulse width modulator wherein the inductor is coupled to a transistor and a diode wherein the transistor is coupled to the pulse width modulator and the diode is coupled to a filter capacitor, the circuit comprising:

• an insulated-gate bipolar transistor coupled in series with the filter capacitor;
• a resistor coupled in parallel with the insulated-gate bipolar transistor;
• a diode coupled in parallel with the resistor;
• and
• an AC detector coupled to the insulated-gate bipolar transistor wherein the AC detector controls the insulated-gate bipolar transistor, via an early power On/Off warning signal, in a manner such that the inrush current to the power source is minimized when power is applied to the power source.

An electrical power supply system comprising:

• a power source wherein the power source comprises a rectifier bridge, an inductor coupled to the rectifier bridge and a pulse width modulator wherein the inductor is coupled to a transistor and a diode wherein the transistor is coupled to the pulse width modulator and the diode is coupled to a filter capacitor;
• an insulated-gate bipolar transistor coupled in series with the filter capacitor;
• a resistor coupled in parallel with the insulated-gate bipolar transistor;
• a diode coupled in parallel with the resistor;
• and
• an AC detector coupled to the insulated-gate bipolar transistor wherein the AC detector controls the insulated-gate bipolar transistor, via an early power On/Off warning signal, in a manner such that the inrush current to the power source is minimized when power is applied to this power source.