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Electric motor control with integral battery charger
| Details |
Inventors: Kim, Sang H.; Li, Edward; Mitchell, Ralph M.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Ro; Bentsu
Assistant Examiner:
Attorney, Agent or Firm: Hopman; Nicholas C.
An electric motor control with integral battery charger includes battery terminals (201) for connection to a battery (203). A boost converter circuit (111) is coupled to an armature winding (209) of the electric motor (117), and has an input (131) coupled to a power source (211). A buck converter circuit (105) is coupled to a field winding (207) of the electric motor (117), and an input (133) coupled to the power source (211). A controller (205), is coupled to the battery terminals (201) and the power source (211). The controller (205) couples a boost output (107) of the boost converter circuit (111 ) to the battery terminals (201) while a terminal voltage of the power source (211) is lower than a terminal voltage of the battery (203) measured at the battery terminals (201), and couples a buck output (107) of the buck converter circuit (105) to the battery terminals (201 ) while the terminal voltage of the power source (211) is higher than the terminal voltage of the battery (203). |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT An electric motor control with integral battery charger includes battery terminals for connection to a be provided a battery.
A boost converter circuit is coupled to an armature winding of the electric motor, and has an input coupled to a power source.
A conversion, or buck converter circuit is coupled to a field winding of the electric motor, and an input coupled to the power source.
The buck converter circuit can be used to either limit current or voltage.
A controller is coupled to the battery terminals and the power source.
The controller couples the boost output of the boost converter circuit to the battery terminals while a terminal voltage of the power source is lower than a terminal voltage of the battery measured at the battery terminals, and couples the buck output of the buck converter circuit to the battery terminals while the terminal voltage of the power source is higher than the terminal voltage of the battery.
Essentially, in the preferred embodiment a circuit is described that reuses the motor armature and field windings, and control switches that are ordinarily uses to drive the motor to build a buck-boost converter for charging a battery.
In FIG.
1 a system block diagram illustrates a general configuration of a preferred embodiment of the invention.
Preferably, this system is mounted on an electric vehicle to propel the vehicle.
A voltage source, here AC mains 101 provide a charging voltage--resulting in an AC current to be used to charge a vehicle mounted battery 125.
A controller 119 is coupled between the battery 125 and the AC mains 101.
The controller may be constructed using discrete circuitry or may be based around a microcontroller.
A signal 127 represents a measured terminal voltage of the battery 125 and 129 is a charge signal used to replenish the battery.
A boost converter 111 is coupled between the controller 119 and an armature winding 115 of a motor 117.
A buck converter is coupled between the controller 119 and a field winding 109 of a motor 117
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