Synchronous-rectification type control for direct current motors and method of making
First Claim
1. An electronic control for a direct current traction motor, comprising:
- a first plurality of parallel-connected power field effect transistors arranged for connection in series with the motor, a field gate electrode of each first field effect transistor being connected to a first common control line for controlling an on-off cycle of conduction through the first field effect transistors to provide drive current to the motor from a direct current source; and
a second plurality of parallel-connected power field effect transistors arranged for connection in parallel with the motor, a field gate electrode of each second field effect transistor being connected to a second common control line for controlling a synchronous-rectification on-off cycle of conduction through the second field effect transistors in synchronism with the on-off cycle of conduction of the first field effect transistors for commuting a motor current when the first parallel-connected field effect transistors are switched off.
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Accused Products
Abstract
A MOSFET control topology and a physical structure for a motor control which provide a more efficient and economic DC motor control are disclosed. The control topology introduces a synchronous-rectification technique wherein free-wheel diodes are replaced with MOSFET devices that are switched on and off by a logic circuit so that they are conductive for commuting motor current during periods that the motor current supply is switched off. The physical structure and method of assembling a DC motor control eliminate time consuming assembly techniques while ensuring effective waste heat exchange between electronic components and a heat sink of the control by providing quick-install spring retainers for urging the components into heat sink conducting contact with the heat sink. The physical structure also provides for high density packing of electronic components in a controller.
51 Citations
12 Claims
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1. An electronic control for a direct current traction motor, comprising:
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a first plurality of parallel-connected power field effect transistors arranged for connection in series with the motor, a field gate electrode of each first field effect transistor being connected to a first common control line for controlling an on-off cycle of conduction through the first field effect transistors to provide drive current to the motor from a direct current source; and a second plurality of parallel-connected power field effect transistors arranged for connection in parallel with the motor, a field gate electrode of each second field effect transistor being connected to a second common control line for controlling a synchronous-rectification on-off cycle of conduction through the second field effect transistors in synchronism with the on-off cycle of conduction of the first field effect transistors for commuting a motor current when the first parallel-connected field effect transistors are switched off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic control for a direct current traction motor, comprising:
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a first plurality of parallel-connected power field effect transistors arranged for connection in series with the motor, a field gate electrode of each first field effect transistor being connected to a first common control line; a second plurality of parallel-connected power field effect transistors arranged for connection in parallel with the motor, a field gate electrode of each second field effect transistor being connected to a second common control line; and control circuitry for generating first and second synchronous control signals, the control circuitry being connected to the first common control line which conducts the first control signal to switch the first field effect transistors in an on-off cycle of conduction to provide drive current to the motor from a direct current source, and the control circuitry being connected to the second common control line which conducts the second control signal for switching the second field effect transistors in a synchronous-rectification cycle of conduction for commuting a motor current when the first field effect transistors are switched off. - View Dependent Claims (10, 11, 12)
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Specification