Power converting device and ground impedance value detecting method
First Claim
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1. A power converting device, comprising:
- a dc-dc converting circuit configured to convert a dc input voltage to a dc bus voltage;
a dc-ac converting circuit electrically coupled to the dc-dc converting circuit and configured to convert the dc bus voltage to an ac voltage; and
an insulation detecting circuit electrically coupled between the dc-dc converting circuit and the dc-ac converting circuit and electrically coupled to a ground terminal, and configured to receive the dc bus voltage,wherein the insulation detecting circuit is configured to detect a ground impedance value of the power converting device according to the received dc bus voltage,wherein the insulation detecting circuit comprises;
a switching unit configured to be configured to be electrically coupled to the dc bus voltage;
a detecting resistor configured to provide a cross voltage across the detecting resistor; and
a processing unit configured to control the switching unit to effect a change to the cross voltage and calculate the ground impedance value according to the cross voltage.
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Abstract
A power converting device includes a DC-DC converting circuit, a DC-AC converting circuit, and an insulation detecting circuit. The DC-DC converting circuit is configured to convert a DC input voltage to a DC bus voltage. The DC-AC converting circuit is electrically coupled to the DC-DC converting circuit and configured to convert the DC bus voltage to an AC voltage. The insulation detecting circuit is electrically coupled between the DC-DC converting circuit and the DC-AC converting circuit. The insulation detecting circuit is configured to detect a ground impedance value of the power converting device according to the DC bus voltage.
17 Citations
17 Claims
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1. A power converting device, comprising:
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a dc-dc converting circuit configured to convert a dc input voltage to a dc bus voltage; a dc-ac converting circuit electrically coupled to the dc-dc converting circuit and configured to convert the dc bus voltage to an ac voltage; and an insulation detecting circuit electrically coupled between the dc-dc converting circuit and the dc-ac converting circuit and electrically coupled to a ground terminal, and configured to receive the dc bus voltage, wherein the insulation detecting circuit is configured to detect a ground impedance value of the power converting device according to the received dc bus voltage, wherein the insulation detecting circuit comprises; a switching unit configured to be configured to be electrically coupled to the dc bus voltage; a detecting resistor configured to provide a cross voltage across the detecting resistor; and a processing unit configured to control the switching unit to effect a change to the cross voltage and calculate the ground impedance value according to the cross voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power converting device, comprising:
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a dc-ac converting circuit; a plurality of dc-dc converting circuits configured to convert a plurality of dc input voltages to a dc bus voltage; and an insulation detecting circuit electrically coupled between the plurality of dc-dc converting circuits and the dc-ac converting circuit and further electrically coupled to a ground terminal, and configured to receive the dc bus voltage, wherein the insulation detecting circuit is configured to detect a ground impedance value of the power converting device according to the received dc bus voltage, wherein the insulation detecting circuit comprises; a switches unit; a detecting resistor configured to provide a cross voltage across the detecting resistor; and a processing unit, wherein the processing unit is configured to control the switching unit to be on or off selectively and calculate the ground impedance value according to the cross voltage when the switching unit is selected to be on and the cross voltage when the switching unit is selected to be off. - View Dependent Claims (12, 13, 14)
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15. A ground impedance value detecting method for a power converting device, the method comprising:
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converting, by a dc-dc converting circuit, a dc input voltage to a dc bus voltage; providing a dc-ac converting circuit configured to convert the dc bus voltage to an ac voltage; receiving, by an insulation detecting circuit electrically coupled to a ground terminal, the dc bus voltage, wherein the insulation detecting circuit is electrically coupled between the dc-dc converting circuit and the dc-ac converting circuit; and detecting, by the insulation detecting circuit, a ground impedance value of the power converting device according to the received dc bus voltage, wherein detecting the ground impedance value comprises; providing a cross voltage across a detecting resistor; controlling, by a processing unit, a switching unit of the insulation detecting circuit ,to be on; outputting the cross voltage to the processing unit when the switching unit is on; controlling, by the processing unit, the switching unit of the insulation detecting circuit, to be off; outputting the cross voltage to the processing unit when the switching unit is off; and calculating, by the processing unit, the ground impedance value according to the cross voltage when the switching unit is on and the cross voltage when the switching unit is off. - View Dependent Claims (16, 17)
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Specification