Apparatus for providing regulated voltage during brief power interruptions

Claim 2

Apparatus for providing a regulated voltage during brief power interruptions for use with a D.C. power supply which delivers current to an output filter capacitor, said apparatus comprising: a comparator circuit; a constant-voltage source, said comparator circuit being connected to said filter capacitor and to said source; a voltage booster having a storage capacitor and means for connecting the storage capacitor to said filter capacitor when the voltage across said filter capacitor exceeds a predetermined value so that an electrical charge is stored on said storage capacitor; means for coupling said booster to said comparator circuit, said comparator circuit comparing a voltage across said filter capacitor with a voltage from said source, said comparator circuit developing a first signal when the voltage across said filter capacitor exceeds said predetermined value, said comparator circuit developing a second signal when the voltage across said filter capacitor is less than said predetermined value, said filter capacitor being coupled to said booster, said second signal causing said booster to deliver a pulse of current to said filter capacitor; and means for transferring substantially all of said charge from said storage capacitor to said filter capacitor when the voltage booster delivers current to said filter capacitor.

Claim 3

Apparatus for providing a regulated voltage during brief power interruptions for use with a D.C. power supply which delivers current to an output filter capacitor, said apparatus comprising: an inductor; a comparator circuit; a constant-voltage source, said comparator circuit being connected to said filter capacitor and to said source; a voltage booster having first and second storage capacitors, first and second resistors, said first resistor being connected between said inductor and a first end of said first storage capacitor, said second storage capacitor being connected between said inductor and a first end of said second resistor, and a controllable rectifier having an anode, a cathode and a gate, said anode of said rectifier being connected to said first end of said first storage capacitor, said cathode of said rectifier being connected to said first end of said second resistor; means for coupling said booster to said comparator circuit, said comparator circuit comparing a voltage across said filter capacitor with a voltage from said source, said comparator circuit developing a first signal when the voltage across said filter capacitor exceeds a predetermined value, said comparator circuit developing a second signal when the voltage across said filter capacitor is less than said predetermined value, said inductor being connected between said voltage booster and a first end of said filter capacitor, said gate of said rectifier being coupled to said means for coupling, a second end of said filter capacitor being connected to a second end of said first storage capacitor and to a second end of said second resistor, said second signal causing said booster to deliver a pulse of current to said filter capacitor.

Claim 4

Apparatus for providing a regulated voltage during brief power interruptions for use with a D.C. power supply which delivers current to an output filter capacitor, said apparatus comprising: an inductor; a comparator circuit; a constant-voltage source, said comparator circuit being connected to said filter capacitor and to said source; a voltage booster having first and second storage capacitors, first and second resistors, said first resistor being connected between said inductor and a first end of said first storage capacitor, said second storage capacitor being connected between said inductor and a first end of said second resistor, and a controllable rectifier having an anode, a cathode and a gate, said anode of said rectifier being connected to said first end of said first storage capacitor, said cathode of said rectifier being connected to said first end of said second resistor; means for coupling said booster to said comparator circuit, said comparator circuit comparing a voltage across said filter capacitor with a voltage from said source, said comparator circuit developing a first signal when the voltage across said filter capacitor exceeds a predetermined value, said comparator circuit developing a second signal when the voltage across said filter capacitor is less than said predetermined value, said inductor being connected between said voltage booster and a first end of said filter capacitor, said gate of said rectifier being coupled to said means for coupling, a second end of said filter capacitor being connected to a second end of said first storage capacitor and to a second end of said second resistor, said second signal causing said booster to deliver a pulse of current to said filter capacitor.

Claim 5

Apparatus for providing a regulated voltage during brief power interruptions for use with a D.C. power supply which delivers current to an output filter capacitor, said apparatus comprising: a comparator circuit; a constant-voltage source, said comparator circuit being connected to said filter capacitor and to said source; an oscillator, said oscillator being coupled to said comparator circuit, said comparator circuit comparing a voltage across said filter capacitor with a voltage from said source, said comparator circuit developing a first signal when the voltage across said filter capacitor exceeds a predetermined value, said comparator circuit developing a second signal when the voltage across said filter capacitor is less than said predetermined value, said first signal causing said oscillator to be disabled, said second signal causing said oscillator to deliver pulses of voltage; a sequencer; and a plurality of voltage boosters, said sequencer being connected between said oscillator and each of said boosters, said filter capacitor being coupled to each of said boosters, said pulses from said oscillator causing said sequencer to sequentially provide trigger signals to each of said boosters, each of said trigger signals causing one of said boosters to deliver a pulse of current to said filter capacitor.

Claim 6

Apparatus for providing a regulated voltage during brief power interruptions for use with a D.C. power supply which delivers current to an output filter capacitor, said apparatus comprising: a comparator circuit; a constant-voltage source, said comparator circuit being connected to said filter capacitor and to said source; an oscillator, said oscillator being coupled to said comparator circuit, said comparator circuit comparing a voltage across said filter capacitor with a voltage from said source, said comparator circuit developing a first signal when the voltage across said filter capacitor exceeds a predetermined value, said comparator circuit developing a second signal when the voltage across said filter capacitor is less than said predetermined value, said first signal causing said oscillator to be disabled, said second signal causing said oscillator to deliver pulses of voltage; a sequencer; and a plurality of voltage boosters, said sequencer being connected between said oscillator and each of said boosters, said filter capacitor being coupled to each of said boosters, said pulses from said oscillator causing said sequencer to sequentially provide trigger signals to each of said boosters, each of said trigger signals causing one of said boosters to deliver a pulse of current to said filter capacitor.

Claim 7

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 3 wherein each of said voltage boosters includes: a storage capacitor; and means for connecting said storage capacitor to said filter capacitor when the voltage across said filter capacitor exceeds said predetermined value.

Claim 8

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 3 including: a storage capacitor in each of said voltage boosters; means for connecting said storage capacitor to said filter capacitor when the voltage across said filter capacitor exceeds said predetermined value so that an electrical charge is stored on said storage capacitor; and said apparatus includes means for transferring substantially all of said charge from said storage capacitor to said filter capacitor when the corresponding voltage booster delivers current to said filter capacitor.

Claim 9

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 3 including: an inductor, said inductor being connected between a first end of said filter capacitor and each of said voltage boosters, each of said voltage boosters including: first and second storage capacitors; first and second resistors, said first resistor being connected between said inductor and a first end of said first storage capacitor, said second storage capacitor being connected between said inductor and a first end of said second resistor; and a controllable rectifier having an anode, a cathode and a gate, said anode of said rectifier being connected to said first end of said first storage capacitor, said cathode of said rectifier being connected to said first end of said second resistor, a second end of said first storage capacitor being connected to a second end of said filter capacitor and to a second end of said second resistor, said gate of said rectifier being coupled to said sequencer.

Claim 10

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 6 including: first and second diodes, said first diode being connected in parallel with said first resistor, said second diode being connected in parallel with said second resistor.

Claim 11

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 3 including: an inductor, said inductor being connected between a first end of said filter capacitor and each of said voltage boosters, each of said voltage boosters including: first and second storage capacitors; first and second resistors, said first resistor being connected between said inductor and a first end of said first storage capacitor, said second storage capacitor being connected between said industor and a first end of said second resistor; a controllable rectifier having an anode, a cathode and a gate, said anode of said rectifier being connected to said first end of said first storage capacitor, said cathode of said rectifier being connected to said first end of said second resistor; and a transformer having a primary winding and a secondary winding, a first end of said primary winding being coupled to said sequencer, a second end of said primary winding being connected to a second end of said filter capacitor, a first end of said secondary winding being connected to said gate of said rectifier, a second end of said secondary winding being connected to said cathode of said rectifier, a second end of said first storage capacitor being connected to said second end of said filter capacitor and to a second end of said filter capacitor and to a second end of said second resistor.

Claim 12

Apparatus for providing a regulated voltage during brief power interruptions as defined in claim 5 including: first and second diodes, said first diode being connected in parallel with said first resistor, said second diode being connected in parallel with said second resistor.