Buck converter with improved filter design
AssigneeInternational Rectifier Corporation
InventorXavier de Frutos
Life of this patent
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Abstract
A buck converter for use in controlling a motor in accordance with an embodiment of the present invention includes a power input operable for connection to a DC power supply, a switch for selectively connecting the motor to the power supply, a pulse width modulation controller operable to provide a pulse width modulation signal to the switch, wherein the switch connects the motor to the power supply based on the pulse width modulation signal, and a voltage shifting capacitor connected across the switch and in series with a diode. The buck converter may include a shift control device operable to control a voltage across the voltage shifting capacitor.
Claims20
A buck converter for use in controlling a motor, the buck converter comprising:
- a power input operable for connection to a DC power supply;
- a switch for selectively connecting the motor to the power supply;
- a pulse width modulation controller operable to provide a pulse width modulation signal to the switch, wherein the switch connects the motor to the power supply based on the pulse width modulation signal;
- a voltage shifting capacitor connected with an anode of a diode;
- and
- another switch directly connecting said anode of said diode to aground terminal of said DC power supply;
- wherein said voltage shifting capacitor and said diode are connected, in series, across said switch, and said diode is connected to said motor only at its cathode.
A buck converter for use in controlling a motor, the buck converter comprising:
- a power input operable for connection to a DC power supply;
- a switch for selectively connecting the motor to the power supply;
- a pulse width modulation control operable to provide a pulse width modulation signal to the switch, wherein the switch connects the motor to the power supply based on the pulse width modulation signal;
- a voltage shifting capacitor connected with an anode of a diode, said voltage shifting capacitor and said diode connected, in series, across said switch, and said diode connected to said motor only at its cathode;
- and
- another switch directly connecting said anode of said diode to a ground terminal of said DC power supply;
- wherein the voltage shifting capacitor acts as a voltage shifter that closes the motor path through a direct current (“DC”) line while the motor is in an OFF state.
A buck converter for use in controlling a motor, the buck converter comprising:
- a power input operable for connection to a DC power supply;
- a switch for selectively connecting the motor to the power supply;
- a pulse width modulation control operable to provide a pulse width modulation signal to the switch, wherein the switch connects the motor to the power supply based on the pulse width modulation signal;
- a voltage shifting capacitor connected with an anode of a diode such that said voltage shifting capacitor and said diode are connected, in series, across said switch, and said diode is connected to said motor only at its cathode;
- and
- another switch directly connecting said anode of said diode to a ground terminal of said DC power supply;
- wherein current flows through the motor when the motor is not connected to the power supply by the switch.
Dependencies are inferred from the claim text.