Power supply providing constant power output

Claim 2

A power supply of the type comprising an alternating polarity source feeding a combination of rectifier means and inductor means serially connected between said rectifier means and a load resistance, characterized by capacitor means interposed in series relation between said source and said rectifier, wherein the power dissipated in said load resistance is constant for resistance values below 1/(4fC), f being the frequency of said source and C being the capacitance of said capacitor.

Claim 3

The power supply as recited in claim 1 wherein said alternating polarity source comprises a square-wave voltage generator and said capacitor means charges linearly to the full voltage of said generator for values of said load resistance, up to said value 1/(4fC).

Claim 4

A power supply for deriving from nonsinusoidal, alternating polarity generator means a constant average power in a load resistance comprising: storage means serially connected to said generator means for accumulating charge, converter means serially connected to said storage means for developing a unidirectional charging current, and means serially connected between said converter means and said load for maintaining said charging current through a path including said load, wherein the power dissipated in said load is constant for load values less than 1/(4fC), f being the frequency of said generator means and C being the capacitance of said means for accumulating charge.

Claim 5

A power supply for deriving from nonsinusoidal, alternating polarity generator means a constant average power in a load resistance comprising: storage means serially connected to said generator means for accumulating charge, converter means serially connected to said storage means for developing a unidirectional charging current, and means serially connected between said converter means and said load for maintaining said charging current through a path including said load, wherein the power dissipated in said load is constant for load values less than 1/(4fC), f being the frequency of said generator means and C being the capacitance of said means for accumulating charge.

Claim 6

The power supply as recited in claim 3 wherein said generating means comprises a square-wave source, said storage means includes a capacitor, said converter means comprises rectifying means, and said maintaining means includes an inductor.

Claim 7

A power supply to control power delivered to a load resistance having a value R L characterized by: means for generating a dual-polarity, square-wave signal of amplitude V F and repetition frequency f, capacitor means having a value C serially connected to said generating means, said capacitor value and said frequency determining a critical resistance R F =1/(4fC), full-wave rectifying means serially connected to said capacitor means for providing a polarized voltage to said load, and inductor means serially connected between said rectifying means and said load for maintaining a charging current to said capacitor means through at least said load, said supply being arranged so that the average power delivered to said load is constant and substantially equal to V F 2 /R F for each positive value of said R L less than said R F .

Claim 8

A power supply to control power delivered to a load resistance having a value R L characterized by: means for generating a dual-polarity, square-wave signal of amplitude V F and repetition frequency f, capacitor means having a value C serially connected to said generating means, said capacitor value and said frequency determining a critical resistance R F =1/(4fC), full-wave rectifying means serially connected to said capacitor means for providing a polarized voltage to said load, and inductor means serially connected between said rectifying means and said load for maintaining a charging current to said capacitor means through at least said load, said supply being arranged so that the average power delivered to said load is constant and substantially equal to V F 2 /R F for each positive value of said R L less than said R F .

Claim 9

Apparatus to control power dissipation in a two-terminal, variable load resistance having value R L as supplied from a source comprising a two-terminal, symmetric square-wave generator having positive and negative voltage levels of amplitude V F and period 1/f, comprising: first, second, third, and fourth rectifying diodes connected in a full-wave rectifying bridge configuration and defining a pair of input terminals and a pair of output terminals, said bridge converting bipolar voltage present at said input terminals to unipolar voltage at said output terminals for providing a polarized voltage having average value V O across said load, a capacitor having a value C and serially connected between said source and said input terminals, said capacitor and said period determining a resistance parameter R F =1/(4fC), and an inductor serially connected between said output terminals and said load terminals for maintaining a substantially constant, unidirectional charging current having value I O through said load, wherein for O<R L ≦R F , said charging current fully charges said capacitor before said square-wave PG,14 generator changes polarity so that constant power of V F 2 /R F is delivered to said load and V O =αV F for R L =α 2 R F , O<α<1, where α represents the ratio of charging time of said capacitor to 1/(2f).

Claim 10

Apparatus to control power dissipation in a two-terminal, variable load resistance having value R L as supplied from a source comprising a two-terminal, symmetric square-wave generator having positive and negative voltage levels of amplitude V F and period 1/f, comprising: first, second, third, and fourth rectifying diodes connected in a full-wave rectifying bridge configuration and defining a pair of input terminals and a pair of output terminals, said bridge converting bipolar voltage present at said input terminals to unipolar voltage at said output terminals for providing a polarized voltage having average value V O across said load, a capacitor having a value C and serially connected between said source and said input terminals, said capacitor and said period determining a resistance parameter R F =1/(4fC), and an inductor serially connected between said output terminals and said load terminals for maintaining a substantially constant, unidirectional charging current having value I O through said load, wherein for O<R L ≦R F , said charging current fully charges said capacitor before said square-wave PG,14 generator changes polarity so that constant power of V F 2 /R F is delivered to said load and V O =αV F for R L =α 2 R F , O<α<1, where α represents the ratio of charging time of said capacitor to 1/(2f).

Claim 11

A power-limited direct current supply circuit comprising a pulse source, a resistive load, and a capacitor, a rectifier and an inductor serially connected in order between said source and said load, wherein the power dissipated in said load is constant for load values below 1/(4fC), f being the frequency of said source and C being the capacitance of said capacitor.

Claim 12

A power-limited direct current supply circuit comprising a pulse source, a resistive load, and a capacitor, a rectifier and an inductor serially connected in order between said source and said load, wherein the power dissipated in said load is constant for load values below 1/(4fC), f being the frequency of said source and C being the capacitance of said capacitor.