System for precharging a DC link in a variable speed drive
First Claim
1. A variable speed drive comprising:
- an inverter arrangement to convert a DC voltage to an AC voltage to power a load;
a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter arrangement;
a converter arrangement to convert an AC voltage from an AC power source to a DC voltage, the converter arrangement being electrically connected in parallel to the DC link, the converter arrangement comprising a plurality of pairs of power switch arrangements, wherein each pair of power switch arrangements includes a first reverse blocking power switch configuration connected in anti-parallel to a second reverse blocking power switch configuration; and
wherein the converter arrangement is controllable to precharge the DC link.
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Accused Products
Abstract
A variable speed drive with a converter that is controllable to precharge a DC link is provided. The variable speed drive also includes an inverter. The converter converts a fixed line frequency, fixed line voltage AC power from an AC power source into DC power. The DC link filters the DC power from the converter. Finally, the inverter is connected in parallel with the DC link and converts the DC power from the DC link into a variable frequency, variable voltage AC power. The converter includes a plurality of pairs of power switches, wherein each pair of power switches includes a reverse blocking power switch arrangement connected in anti-parallel to another reverse blocking power switch arrangement. Alternatively, each pair of power switches includes a reverse blocking power switch connected in anti-parallel with a silicon carbide controlled rectifier.
64 Citations
22 Claims
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1. A variable speed drive comprising:
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an inverter arrangement to convert a DC voltage to an AC voltage to power a load; a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter arrangement; a converter arrangement to convert an AC voltage from an AC power source to a DC voltage, the converter arrangement being electrically connected in parallel to the DC link, the converter arrangement comprising a plurality of pairs of power switch arrangements, wherein each pair of power switch arrangements includes a first reverse blocking power switch configuration connected in anti-parallel to a second reverse blocking power switch configuration; and wherein the converter arrangement is controllable to precharge the DC link. - View Dependent Claims (2, 3, 4, 5)
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6. A chiller system comprising:
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a refrigerant circuit comprising a compressor, a condenser arrangement and an evaporator arrangement connected in a closed loop; a drive arrangement connected to the compressor to power the compressor, the drive arrangement comprising a motor and a variable speed drive, the variable speed drive comprising; an inverter arrangement electrically connected to the motor, the inverter arrangement being configured to convert a DC voltage to an AC voltage to power the motor; a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter arrangement; and a converter arrangement to convert an AC voltage from an AC power source to a DC voltage, the converter arrangement being electrically connected in parallel to the DC link, the converter arrangement comprising a plurality of pairs of power switch arrangements, wherein each pair of power switch arrangements includes a first reverse blocking power switch configuration connected in anti-parallel to a second reverse blocking power switch configuration; and wherein the converter arrangement is controllable to precharge the DC link. - View Dependent Claims (7, 8, 9, 10)
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11. A variable speed drive comprising:
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an inverter module to convert a DC voltage to an AC voltage to power a load; a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter module; a converter module to convert an AC voltage from an AC power source to a DC voltage, the converter module being electrically connected in parallel to the DC link, the converter module comprising a plurality of pairs of power switches, wherein each pair of power switches includes; a first insulated gate bipolar transistor in series with a first diode configured to provide reverse blocking; a second insulated gate bipolar transistor in series with a second diode configured to provide reverse blocking, the second insulated gate bipolar transistor in series with the second diode being connected in anti-parallel with the first insulated gate bipolar transistor in series with the first diode; and wherein the first insulated gate bipolar transistor being connected in inverse parallel with the second diode, and the second insulated gate bipolar transistor being connected in inverse parallel with the first diode; and wherein the converter module is controllable to precharge the DC link. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A chiller system comprising:
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a refrigerant circuit comprising a compressor, a condenser arrangement and an evaporator arrangement connected in a closed loop; a drive arrangement connected to the compressor to power the compressor, the drive arrangement comprising a motor and a variable speed drive, the variable speed drive comprising; an inverter module electrically connected to the motor, the inverter module being configured to convert a DC voltage to an AC voltage to power the motor; a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter module; a converter module to convert an AC voltage from an AC power source to a DC voltage, the converter module being electrically connected in parallel to the DC link, the converter module comprising a plurality of pairs of power switches, wherein each pair of power switches includes a first insulated gate bipolar transistor and anti-parallel diode connected in series with a second insulated gate bipolar transistor and anti-parallel diode, the second insulated gate bipolar transistor and anti-parallel diode having an inverse configuration with respect to the first insulated gate bipolar transistor and anti-parallel diode; and wherein the first insulated gate bipolar transistor being connected in series with the anti-parallel diode for the second insulated gate bipolar transistor, and the second insulated gate bipolar transistor being connected in series with the anti-parallel diode for the first insulated gate bipolar transistor; and wherein the converter module is controllable to precharge the DC link. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification