Power supply apparatus for motor and control method thereof
First Claim
1. A power supply apparatus for a motor including an AC power supply, a diode rectifier circuit to rectify power of the AC power supply and a DC capacitor to smooth the rectified power, comprising:
- a current limiting part provided between the AC power supply and the DC capacitor;
a connection switching part to switch a connection state of the diode rectifier circuit and the current limiting part; and
a controller to control the connection switching part so that the diode rectifier circuit and the current limiting part are connected to each other selectively in parallel or in series.
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Accused Products
Abstract
A power supply apparatus for a motor including an AC power supply, a diode rectifier circuit to rectify power of the AC power supply and a DC capacitor to smooth the rectified power, comprising a current limiting part provided between the AC power supply and the DC capacitor; a connection switching part to switch a connection state of the diode rectifier circuit and the current limiting part; a controller to control the connection switching part so that the diode rectifier circuit and the current limiting part are connected to each other one of in parallel and in series. Thus, an inrush current protection circuit and an over voltage protection circuit use a single resistor according to their respective functions.
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Citations
21 Claims
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1. A power supply apparatus for a motor including an AC power supply, a diode rectifier circuit to rectify power of the AC power supply and a DC capacitor to smooth the rectified power, comprising:
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a current limiting part provided between the AC power supply and the DC capacitor;
a connection switching part to switch a connection state of the diode rectifier circuit and the current limiting part; and
a controller to control the connection switching part so that the diode rectifier circuit and the current limiting part are connected to each other selectively in parallel or in series. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control method of a power supply apparatus for a motor including an AC power supply, a diode rectifier circuit to rectify power of the AC power supply, a DC capacitor to smooth the rectified power, a resistor connected to the DC capacitor and a two-contact relay to allow an end part of the diode rectifier circuit selectively connected to one of first and second end parts of the resistor, comprising:
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connecting the diode rectifier circuit to the resistor in series so as to charge the DC capacitor when power is supplied initially;
detecting voltage applied between first and second end parts of the DC capacitor; and
connecting the diode rectifier circuit to the resistor in parallel when the detected voltage is more than a predetermined voltage.
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10. A power supply apparatus for a motor including an AC power supply, a rectifier circuit to rectify power of the AC power-supply and a smoothing circuit to smooth the rectified power, comprising:
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a current limiting part provided between the AC power supply and the smoothing circuit; and
a connection switching part to switch a connection state of the rectifier circuit and the current limiting part so that the rectifier circuit and the current limiting part are connected to each other selectively in parallel or in series. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A power supply apparatus for a motor including an AC power supply, a rectifier circuit to rectify power of the AC power supply and a smoothing circuit to smooth the rectified power, comprising:
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a current limiting part comprising;
a resistor such that the current limiting part is provided between the AC power supply and the smoothing circuit;
an over voltage protection part connected to the resistor and provided in parallel with the rectifier circuit; and
a connection switching part to switch the rectified AC power supply to provide one or more of a current limiting protection and an over voltage protection according to a connection state of the connection switching part.
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18. A control method of a power supply apparatus for a motor including an AC power supply, a rectifier circuit rectifying power of the AC power supply and a smoothing circuit having a DC capacitor and smoothing the rectified power, a resistor having first and second ends, one of the ends of the resistor being connected to the DC capacitor having first and second ends and a relay allowing the rectifier circuit to be alternatively connected to one of the first and second ends of the resistor, comprising:
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supplying power to the motor;
current limiting the supplied power when the power is supplied initially by connecting the rectifier circuit to the resistor in series;
detecting a voltage across the first and second ends of the DC capacitor; and
switching the rectifier circuit and the resistor to a parallel connection when the detected voltage is more than a predetermined voltage. - View Dependent Claims (19, 20, 21)
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Specification