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US 6,548,983 B2Granted
PWM-pulse control system
AssigneeSTMicroelectronics S.r.l.
InventorsLeonardo Dino Avella, Giuseppe Palma, Antonino Cuce'
Life of this patent
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Abstract
A power modulation control system using PWM pulses is provided. The system comprises an AC voltage generator, an electric load, and a control circuit incorporating at least one rectifier. The electric load is connected between the generator and the rectifier, and first and second monodirectional switches are connected in parallel with the load.
Claims40
A power modulation control system using PWM pulses and comprising:
- an AC voltage generator;
- an inductive electric load;
- and
- a PWM control circuit incorporating at least one rectifier, wherein said electric load is connected between said generator and said rectifier, the control circuit including a pair of circuit elements connected in parallel to the load, both circuit elements being turned on if a power transistor is turned off, both circuit elements being turned off if the power transistor is turned on.
1 more element
A PWM controller comprising:
- an AC voltage generator;
- a PWM control circuit incorporating at least one rectifier;
- an inductive electric load connected between said generator and said rectifier;
- and
- first and second monodirectional switches connected to the electric load in parallel, the first and second monodirectional switches both being turned on if a power transistor is turned off, and the first and second monodirectional switches both being turned off if the power transistor is turned on.
2 more elements
An electronic device, comprising:
- a universal motor operating with an alternating current;
- an AC voltage generator connected to one terminal of said motor;
- and
- a PWM controller incorporating at least one rectifier and connected to another terminal of said motor, said PWM controller further comprising first and second monodirectional switches connected to the motor in parallel, the first and second monodirectional switches both being turned on if a power transistor is turned off, and the first and second monodirectional switches both being turned off if the power transistor is turned on.
1 more element
A power modulation control system using PWM pulses, the control system comprising:
- an AC voltage generator;
- an electric load;
- a control circuit incorporating at least one rectifier, wherein said electric load is connected between said generator and said rectifier;
- first and second monodirectional switches connected to the electric load in parallel;
- and
- a driving circuit for said monodirectional switches connected to said electric load to detect a line current sensing and drive said monodirectional switches in opposition with respect to said PWM pulses, wherein said driving circuit comprises:
- a first NOR logic gate inserted between said generator and a first terminal of said electric load and connected to a first pair of sensing resistors, wherein said resistors are in turn inserted between said generator and said first terminal of said electric load;
- and
- a second NOR logic gate inserted between said rectifier and a second terminal of said electric load and connected to a second pair of sensing resistors, wherein said second pair of resistors is in turn inserted between said rectifier and said second terminal of said electric load, said sensing resistors detecting a line current sensing in order to supply said NOR logic gates and, through such gates, to drive said monodirectional switches.
6 more elements
A power modulation control system using PWM pulses, the control system comprising:
- an AC voltage generator;
- an electric load;
- a control circuit incorporating at least one rectifier, wherein said electric load is connected between said generator and said rectifier, wherein said control circuit has a circuit leg connected in parallel to an output of the rectifier and includes a power transistor supplied by said PWM pulses, as well as a snubber circuit in parallel with said circuit leg.
A PWM controller, comprising:
- an AC voltage generator;
- a control circuit incorporating at least one rectifier;
- an electric load connected between said generator and said rectifier;
- first and second monodirectional switches connected to the electric load in parallel;
- and
- a driving circuit for said monodirectional switches connected to said electric load so as to detect a line current and to drive said monodirectional switches in opposition with respect to said PWM pulses, wherein said driving circuit comprises:
- a first NOR logic gate inserted between said generator and a first terminal of said electric load and connected to a first pair of sensing resistors, wherein said resistors are in turn inserted between said generator and said first terminal of said electric load;
- and
- a second NOR logic gate inserted between said rectifier and a second terminal of said electric load and connected to a second pair of sensing resistors, wherein said second pair of resistors is in turn inserted between said rectifier and said second terminal of said electric load, said sensing resistors detecting a line current in order to supply said NOR logic gates and, through such gates, to drive said monodirectional switches.
6 more elements
An electronic device, comprising:
- a universal motor operating with an alternating current;
- an AC voltage generator connected to one terminal of said motor;
- a PWM controller incorporating at least one rectifier and connected to another terminal of said motor, said PWM controller further comprising first and second monodirectional switches connected to the motor in parallel, wherein said controller has a circuit leg connected in parallel to the output of the rectifier and includes a power transistor supplied by a PWM signal;
- and
- a snubber circuit in parallel with said circuit leg.
2 more elements
Dependencies are inferred from the claim text.