Direct current power control circuit

Claim 2

A control circuit for varying the amount of power delivered from a source of power to a load by varying the percentage of time the load is connected to the source comprising: a. a single power circuit for coupling the source to the load including a first switching device, a second switching device, and an inductor coupled in series circuit relationship; b. a capacitor coupled in parallel circuit relationship with the series combination of said second switching device and said inductor, said second switching device and said inductor comprising a charge reversing circuit for reversing the charge on said capacitor at a selected frequency; and c. means responsive to the reversal of the capacitor charge to render said first switching device conductive whereby the power is delivered from the source to the load through said capacitor.

Claim 3

The invention in accordance with claim 1 wherein said first and said second switching devices are controlled rectifiers.

Claim 4

The invention in accordance with claim 2 wherein said charge reversing circuit includes oscillator means for rendering said second controlled rectifier conductive to reverse the charge on the capacitor.

Claim 5

The invention in accordance with claim 3 where the charge on the capacitor selectively serves to place both of said controlled rectifiers into a nonconductive state.

Claim 6

A control circuit for varying the amount of power delivered from a source of power to a load by varying the percentage of time the load is connected to the source comprising: a. first and second switching means selectively operable in a first mode of operation to control the amount of power supplied to said load from said source; b. means to selectively render said first and said second switching means conductive; c. commutating means in circuit with said first and second switching means to render said switching means non-conductive; and, d. means to inhibit the rendering of said first switching means conductive in a second mode of operation whereby power is Supplied to said load through said second switching means.

Claim 7

A control circuit for varying the amount of power delivered from a source of power to a load by varying the percentage of time the load is connected to the source comprising: a. first and second switching means selectively operable in a first mode of operation to control the amount of power supplied to said load from said source; b. means to selectively render said first and said second switching means conductive; c. commutating means in circuit with said first and second switching means to render said switching means non-conductive; and, d. means to inhibit the rendering of said first switching means conductive in a second mode of operation whereby power is Supplied to said load through said second switching means.

Claim 8

The invention in accordance with claim 5 wherein said first and second switching means are controlled rectifiers.

Claim 9

The invention in accordance with claim 6 wherein the means to selectively render the first and second controlled rectifiers conductive includes a variable frequency oscillator.

Claim 10

The invention in accordance with claim 6 wherein said commutating means includes a capacitor controlably chargeable in first and second directions to render, respectively said first and second controlled rectifiers nonconductive.

Claim 11

The invention in accordance with claim 7 wherein the means to inhibit includes an inhibit circuit disposed intermediate said oscillator and said first controlled rectifier whereby signals from said oscillator are prevented from reaching the first controlled rectifier.

Claim 12

A circuit for controlling the amount of power delivered to a load from a direct current power source comprising: a. a first controlled rectifier in series with said load and said source, said rectifier alternately changed between a conductive and a non-conductive state to thereby control the effective power applied to said load in a first mode of circuit operation; b. a storage means for the retention of a quantum of electrical energy in communication with said source whereby said storage means is electrically charged in a first direction; c. a reversing circuit loop, independent of said first controlled rectifier whereby said storage means may electrically charge in a second direction opposite to that first specified; d. a second controlled rectifier, alternately changed from a conductive to a nonconductive state, connected in series with said load and said source and in parallel with said first controlled rectifier, said second controlled rectifier acting in said first mode of circuit operation to apply the second direction charge on said storage means to said first controlled rectifier to render that rectifier nonconductive; and, e. means to effect a second mode of circuit operation including means to inhibit the first controlled rectifier from the conductive state while permitting the second controlled rectifier to conduct whereby power is supplied from said source to said load through said second controlled rectifier.

Claim 13

A circuit for controlling the amount of power delivered to a load from a direct current power source comprising: a. a first controlled rectifier in series with said load and said source, said rectifier alternately changed between a conductive and a non-conductive state to thereby control the effective power applied to said load in a first mode of circuit operation; b. a storage means for the retention of a quantum of electrical energy in communication with said source whereby said storage means is electrically charged in a first direction; c. a reversing circuit loop, independent of said first controlled rectifier whereby said storage means may electrically charge in a second direction opposite to that first specified; d. a second controlled rectifier, alternately changed from a conductive to a nonconductive state, connected in series with said load and said source and in parallel with said first controlled rectifier, said second controlled rectifier acting in said first mode of circuit operation to apply the second direction charge on said storage means to said first controlled rectifier to render that rectifier nonconductive; and, e. means to effect a second mode of circuit operation including means to inhibit the first controlled rectifier from the conductive state while permitting the second controlled rectifier to conduct whereby power is supplied from said source to said load through said second controlled rectifier.

Claim 14

The invention in accordance with claim 10 wherein said load is a direct current motor.

Claim 15

The invention in accordance with claim 10 wherein said storage means is a capacitor.

Claim 16

The invention in accordance with claim 12 wherein the capacitor is in series with said second controlled rectifier and in parallel with said first controlled rectifier.

Claim 17

A control circuit for controlling the amount of power supplied to a load comprising: a. a main power circuit including a battery, the load, a transformer primary winding and a first thyristor all in series; b. a source of variable frequency pulses for supplying signals to said first thyristor whereby said thyristor may switch from a blocking to a conducting state; c. a second power circuit comprising a series arrangement of a second thyristor and a commutating capacitor, said second power circuit connected in parallel with said first thyristor; d. means for charging said capacitor in a first direction; e. a reversing circuit including a transformer secondary and a third thyristor in series with said secondary, said reversing circuit connected in parallel with said capacitor; f. means connecting said source with said third thyristor whereby pulses derived from said source may render said third thyristor conductive to effect the charging of said capacitor in a second direction opposite to that first imposed; g. sensing means responsive to a prescribed voltage across said transformer secondary to produce a signal to switch said second thyristor into a conductive state completing a circuit loop comprising said first and second thyristors and said capacitor whereby the second dIrection charge on said capacitor serves to render said first thyristor non-conductive to effect a first mode of control circuit operation; and, h. means to inhibit the rendering of said first thyristor conductive to effect a second mode of control circuit operation in which power is delivered to said load from said battery through said second thyristor.

Claim 18

A control circuit for controlling the amount of power supplied to a load comprising: a. a main power circuit including a battery, the load, a transformer primary winding and a first thyristor all in series; b. a source of variable frequency pulses for supplying signals to said first thyristor whereby said thyristor may switch from a blocking to a conducting state; c. a second power circuit comprising a series arrangement of a second thyristor and a commutating capacitor, said second power circuit connected in parallel with said first thyristor; d. means for charging said capacitor in a first direction; e. a reversing circuit including a transformer secondary and a third thyristor in series with said secondary, said reversing circuit connected in parallel with said capacitor; f. means connecting said source with said third thyristor whereby pulses derived from said source may render said third thyristor conductive to effect the charging of said capacitor in a second direction opposite to that first imposed; g. sensing means responsive to a prescribed voltage across said transformer secondary to produce a signal to switch said second thyristor into a conductive state completing a circuit loop comprising said first and second thyristors and said capacitor whereby the second dIrection charge on said capacitor serves to render said first thyristor non-conductive to effect a first mode of control circuit operation; and, h. means to inhibit the rendering of said first thyristor conductive to effect a second mode of control circuit operation in which power is delivered to said load from said battery through said second thyristor.

Claim 19

The invention in accordance with claim 14 wherein said load is a direct current motor.