Compressor control apparatus and control method
First Claim
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1. A compressor control apparatus, comprising:
- a rectifying unit configured to rectify power applied from an outside;
a DC link unit configured to include a first capacitor and a second capacitor and smooth the rectified voltage;
an inverter unit configured to include a first inverter switch and a second inverter switch and convert the smoothed DC voltage into a driving voltage of a motor according to a control signal; and
a control unit configured to generate the control signal, wherein the control unit applies a DC offset voltage to the driving voltage according to a direction of a current applied to the motor on the basis of a result obtained by comparing voltages across the first capacitor and the second capacitor, wherein when a voltage across the first capacitor is greater than a voltage across the second capacitor, the control unit applies the driving voltage not including the DC offset voltage in a time section of a direction of a second current flowing from a first node to a second node.
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Abstract
A compressor control apparatus includes a rectifying unit configured to rectify power applied from the outside, a DC link unit configured to include a pair of capacitors and smooth the rectified voltage, an inverter unit configured to include a pair of switches and convert the smoothed DC voltage into a driving voltage of a motor according to a control signal, and a control unit configured to generate the control signal, wherein the control unit applies a DC offset voltage to the driving voltage according to a direction of a current applied to the motor on the basis of a result obtained by comparing voltages across the pair of capacitors.
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Citations
13 Claims
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1. A compressor control apparatus, comprising:
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a rectifying unit configured to rectify power applied from an outside; a DC link unit configured to include a first capacitor and a second capacitor and smooth the rectified voltage; an inverter unit configured to include a first inverter switch and a second inverter switch and convert the smoothed DC voltage into a driving voltage of a motor according to a control signal; and a control unit configured to generate the control signal, wherein the control unit applies a DC offset voltage to the driving voltage according to a direction of a current applied to the motor on the basis of a result obtained by comparing voltages across the first capacitor and the second capacitor, wherein when a voltage across the first capacitor is greater than a voltage across the second capacitor, the control unit applies the driving voltage not including the DC offset voltage in a time section of a direction of a second current flowing from a first node to a second node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a compressor including a rectifying unit configured to rectify power applied from an outside, a DC link unit configured to include a first capacitor and a second capacitor and smooth the rectified voltage, an inverter unit configured to include a first inverter switch and a second inverter switch and convert the smoothed DC voltage into a driving voltage of a motor according to a control signal, and a control unit configured to generate the control signal, the method comprising:
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measuring a voltage across each of the first capacitor and the second capacitor; comparing the measured voltages across the two capacitors; and applying a DC offset voltage to the driving voltage according to a direction of a current applied to the motor on the basis of the comparison result, wherein when a voltage across the first capacitor is greater than a voltage across the second capacitor, the driving voltage not including the DC offset voltage is applied in a time section of a direction of a second current flowing from a first node to a second node. - View Dependent Claims (10, 11, 12, 13)
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Specification