System for precharging a DC link in a variable speed drive
First Claim
1. A variable speed drive comprising:
- 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 reverse blocking power switch connected in anti-parallel to a silicon carbide controlled rectifier; and
wherein the converter module 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 connected in anti-parallel to another reverse blocking power switch. Alternatively, each pair of power switches includes a reverse blocking power switch connected in anti-parallel with a silicon carbide controlled rectifier.
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Citations
20 Claims
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1. 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 reverse blocking power switch connected in anti-parallel to a silicon carbide controlled rectifier; and
wherein the converter module is controllable to precharge the DC link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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; and
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 reverse blocking power switch connected in anti-parallel to a silicon carbide controlled rectifier; and
wherein the converter module is controllable to precharge the DC link. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification