Converter apparatus, inverter apparatus, and DC link voltage control method
First Claim
1. A converter apparatus which is connected via a DC link to an inverter circuit for driving a motor, said DC link having a power storage part capable of storing regenerative power from said motor, and which converts AC power supplied from a power source into DC power and supplies said DC power to said inverter circuit through said DC link, said converter apparatus comprising:
- a voltage detection part for detecting a DC link voltage appearing across said DC link; and
a charge stopping part for stopping charging said power storage part when said detected DC link voltage exceeds a predetermined upper limit voltage.
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Accused Products
Abstract
The invention is directed to the provision of a converter apparatus, an inverter apparatus, and a DC link voltage control method, wherein the upper limit value of the DC link voltage that rises due to regenerative energy occurring from a motor is set high, thereby increasing the regenerative energy to be stored in a DC link. The converter apparatus (10) comprises: a voltage detection part (11) for monitoring the DC link voltage occurring across the DC link (30); and a charge stopping part (12) for stopping charging a power storage part (C) when the detected value of the DC link voltage exceeds a predetermined upper limit voltage as the motor (3) is decelerated.
28 Citations
9 Claims
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1. A converter apparatus which is connected via a DC link to an inverter circuit for driving a motor, said DC link having a power storage part capable of storing regenerative power from said motor, and which converts AC power supplied from a power source into DC power and supplies said DC power to said inverter circuit through said DC link, said converter apparatus comprising:
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a voltage detection part for detecting a DC link voltage appearing across said DC link; and
a charge stopping part for stopping charging said power storage part when said detected DC link voltage exceeds a predetermined upper limit voltage. - View Dependent Claims (2, 3, 4, 5)
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6. An inverter apparatus wherein said DC power supplied through said DC link after conversion by a converter apparatus as claimed in 1 is converted by said inverter circuit into AC power to drive said motor.
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7. A method for controlling a DC link voltage appearing across a DC link connected between an inverter for driving a motor and a converter for converting AC power supplied from a power source into DC power and for supplying said DC power to said inverter, said DC link having a power storage part capable of storing regenerative power from said motor, wherein said control method comprises:
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detecting said DC link voltage; and
stopping charging said power storage part with said regenerative power when said detected DC link voltage exceeds a predetermined upper limit voltage due to the regenerative power occurring from said motor. - View Dependent Claims (8, 9)
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Specification