Use of cooling fan in adjustable speed drives
AssigneeToshiba International Corporation
InventorsMohammed Arefeen, Mark Rayner
Life of this patent
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Abstract
Apparatuses and methods are described for implementing adjustable speed drives. For instance, an apparatus may comprise an inverter circuit configured to drive a multi-phase electrical load, the inverter configured to be powered by first and second direct-current (DC) bus lines, a fan drive circuit configured to be powered by the first and second DC bus lines, a fan configured to be controlled by the fan drive circuit and having a plurality of windings coupled together at an electrical node, a first capacitor having a first terminal coupled to the first DC bus line and a second terminal coupled to the electrical node, and a second capacitor having a first terminal coupled to the second DC bus lines and a second terminal coupled to the electrical node.
Claims20
An apparatus, comprising:
- an inverter circuit configured to drive a multi-phase electrical load, the inverter configured to be powered by first and second direct-current (DC) bus lines;
- a fan drive circuit configured to be powered by the first and second DC bus lines;
- a fan configured to be controlled by the fan drive circuit and having a plurality of windings coupled together at an electrical node;
- a first capacitor having a first terminal coupled to the first DC bus line and a second terminal coupled to the electrical node;
- and
- a second capacitor having a first terminal coupled to the second DC bus lines and a second terminal coupled to the electrical node.
An apparatus, comprising:
- a plurality of insulated gate bipolar transistors (IGBTs) each having a collector/emitter path electrically extending between first and second electrical nodes;
- a fan configured to be controlled by the plurality of IGBTs and having a plurality of windings electrically coupled together at a third electrical node;
- a first capacitor having a first terminal coupled to the first electrical node and a second terminal coupled to the third electrical node;
- a second capacitor having a first terminal coupled to the second electrical node and a second terminal coupled to the third electrical node;
- and
- a controller configured to control the IGBTs based on a first voltage between the first and third electrical nodes and based on a second voltage between the second and third electrical nodes.
An apparatus, comprising:
- an inverter circuit configured to drive a multi-phase electrical load, the inverter configured to be powered by first and second direct-current (DC) bus lines;
- a fan drive circuit configured to be powered by the first and second DC bus lines;
- a fan configured to be controlled by the fan drive circuit and having a plurality of windings coupled together at an electrical node;
- and
- a controller configured to selectively control the fan drive circuit based upon a measured voltage of the electrical node relative to the first and second DC bus lines.
Dependencies are inferred from the claim text.