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US 10,103,729 B2Granted
Auxiliary commutated silicon-controlled rectifier circuit methods and systems
AssigneeRockwell Automation Technologies, Inc.
InventorRobert S. Schneider
Life of this patent
Estimating the term…
Abstract
A device includes a first silicon-controlled rectifier (SCR), a second SCR connected in anti-parallel with the first SCR, and a commutation module. The commutation module is configured to apply a reverse bias voltage to the first SCR or the second SCR to turn off the first SCR or the second SCR. The device further includes a voltage clamp configured to dissipate energy when the first SCR or the second SCR are turned off. The voltage clamp is charged as one of the first SCR or the second SCR are powered on.
Claims17
A device comprising:
- a first silicon-controlled rectifier (SCR);
- a second SCR connected in anti-parallel with the first SCR;
- a commutation module, wherein the commutation module is configured to apply a reverse bias voltage to the first SCR or the second SCR to turn off the first SCR or the second SCR;
- and
- a voltage clamp configured to dissipate energy when the first SCR or the second SCR are turned off, wherein the voltage clamp is charged as one of the first SCR or the second SCR are powered on,
- wherein the commutation module comprises a first commutation module and a second commutation module;
- wherein the first commutation module comprises a first voltage source, a third SCR, and a first self-commutating semiconductor switch connected in series, and the first commutation module is configured to apply a first reverse bias voltage to the first SCR to turn off the first SCR;
- wherein the second commutation module comprises a second voltage source, a fourth SCR, and a second self-commutating semiconductor switch connected in series, and the second commutation module is configured to apply a second reverse bias voltage to the second SCR to turn off the second SCR;
- and
- wherein the first SCR, the second SCR, the first commutation module, and the second commutation module are connected in parallel.
7 more elements
A device comprising:
- a first silicon-controlled rectifier (SCR);
- a second SCR connected in anti-parallel with the first SCR;
- a commutation module, wherein the commutation module is configured to apply a reverse bias voltage to the first SCR or the second SCR to turn off the first SCR or the second SCR;
- and
- a voltage clamp configured to dissipate energy when the first SCR or the second SCR are turned off, wherein the voltage clamp is charged as one of the first SCR or the second SCR are powered on,
- wherein the commutation module is connected in parallel with the first SCR and the second SCR, and further wherein the commutation module comprises:
- a first terminal on a supply side of the device connected to an anode side of a third SCR and a cathode side of a fourth SCR;
- a second terminal on a load side of the device connected to an anode side of a fifth SCR and a cathode side of a sixth SCR;
- a third terminal connected to a cathode side of the third SCR, a cathode side of the fifth SCR, and a first side of a self-commutating semiconductor switch;
- a fourth terminal connected to an anode side of the fourth SCR, an anode side of the sixth SCR, and a first side of a voltage source;
- and
- a fifth terminal connected to a second side of the self-commutating semiconductor switch and a second side of the voltage source.
9 more elements
A method comprising:
- connecting a first silicon-controlled rectifier (SCR), a second SCR, and a commutation module in parallel;
- connecting a load to an operating signal;
- passing the operating signal through the SCR to the load, wherein a voltage clamp is charged as one of the first SCR or the second SCR are powered on by charging a voltage source of the voltage clamp via a diode bridge and a transformer connected to an AC supply, wherein a current from the transformer charges the voltage source of the voltage clamp, and wherein the AC supply also provides the operating signal to the load;
- applying, by the commutation module, a reverse bias voltage to the first SCR to turn off the first SCR;
- and
- dissipating energy with a voltage clamp when the first SCR or the second SCR is turned off.
3 more elements
Dependencies are inferred from the claim text.