System for operating DC motors and power converters
First Claim
1. A system for driving a direct-current (DC) motor under conditions of a controlled average current independent from a load, from a DC voltage source having a larger or smaller value than a nominal voltage of said DC motor, said system comprising:
- a diode;
a magnetic transformer connected in series with said diode in a circuit arrangement selected from the group consisting of a flyback DC-DC converter and a ringing choke DC-DC converter, said magnetic transformer and said diode for connection in series with said DC motor;
a switch coupled to said magnetic transformer and said diode for connecting and disconnecting a terminal of said magnetic transformer and said diode remote from said DC motor to said DC voltage source;
a capacitor arranged for connection in parallel with said DC motor to limit a resulting voltage over said DC motor, said capacitor being capable of operating in a buck converter at the power level required to operate said DC motor and at the frequency of commutation of said switch;
means for measuring a current through said DC motor; and
means for controlling operation of said switch dependent upon said measured current in said DC motor.
0 Assignments
0 Petitions
Accused Products
Abstract
A system is disclosed for driving a DC motor (15) under conditions of a controlled average current. An inductive element may be arranged for connection in series with the DC motor. A switch (14) is preferably coupled to the inductive element for connecting and disconnecting a terminal of the inductive element from the voltage source. A diode may be arranged for connection in parallel with a combination of the inductive element and the DC motor arranged in series, with appropriate polarity so that current circulating through the inductive element circulates through the diode when the switch disconnects the terminal from the voltage source. A capacitor is arranged for connection in parallel with the motor, for limiting a resulting voltage over the motor or for storing charge depending on the embodiment of the invention. A device for measuring a current through the motor is provided, and a device (13) for controlling operation of the switch dependent upon the measured current in the motor is also provided. An airflow apparatus is also disclosed.
46 Citations
21 Claims
-
1. A system for driving a direct-current (DC) motor under conditions of a controlled average current independent from a load, from a DC voltage source having a larger or smaller value than a nominal voltage of said DC motor, said system comprising:
-
a diode; a magnetic transformer connected in series with said diode in a circuit arrangement selected from the group consisting of a flyback DC-DC converter and a ringing choke DC-DC converter, said magnetic transformer and said diode for connection in series with said DC motor; a switch coupled to said magnetic transformer and said diode for connecting and disconnecting a terminal of said magnetic transformer and said diode remote from said DC motor to said DC voltage source; a capacitor arranged for connection in parallel with said DC motor to limit a resulting voltage over said DC motor, said capacitor being capable of operating in a buck converter at the power level required to operate said DC motor and at the frequency of commutation of said switch; means for measuring a current through said DC motor; and means for controlling operation of said switch dependent upon said measured current in said DC motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for driving a direct-current (DC) motor under conditions of a controlled average current independent from a load, from a DC voltage source having a larger or smaller value than said motor nominal voltage, said system comprising:
-
an electronic synchronous rectification switch; a magnetic transformer connected in series with said synchronous rectification switch in a circuit arrangement selected from the group consisting of a flyback DC-DC converter and a ringing choke DC-DC converter, said transformer and said synchronous rectification switch for connection in series with said DC motor; a switch coupled to said magnetic transformer and said synchronous rectification switch for connecting and disconnecting a terminal of said magnetic transformer and said synchronous rectification switch remote from said DC motor to said voltage source; a capacitor arranged for connection in parallel with said DC motor to limit a resulting voltage over said DC motor, said capacitor being capable of operating in a buck converter at the power level required to operate said DC motor and at the frequency of commutation of said switch; means for measuring a current through said DC motor; and means for controlling operation of said switch dependent upon said measured current in said DC motor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A system for driving a direct-current (DC) motor under conditions of a controlled average current, from a DC voltage source having a larger or smaller value than a nominal voltage of said DC motor, said system comprising:
-
a diode; a magnetic transformer connected in series with said diode in a circuit arrangement selected from the group consisting of a flyback DC-DC converter and a ringing choke DC-DC converter, said magnetic transformer and said diode for connection in series with said DC motor; a switch coupled to said magnetic transformer and said diode for connecting and disconnecting a terminal of said magnetic transformer and said diode remote from said DC motor to said DC voltage source; a capacitor arranged for connection in parallel with said DC motor to limit a resulting voltage over said DC motor, said capacitor being capable of operating in a buck converter at the power level required to operate said DC motor and at the frequency of commutation of said switch; means for measuring a current through said DC motor; and means for controlling operation of said switch dependent upon said measured current in said DC motor; wherein a current through an inductance of output windings of said magnetic transformer can be controlled independently from a current through said DC motor, the balance of electrical charge being accumulated or taken from said capacitor in parallel with said DC motor, and wherein the current through said DC motor is calculated from the variation of the voltage across said capacitor in parallel with said DC motor.
-
Specification