Uninterruptible power supplies with converter operation conditioned upon static switch commutation and methods of operation thereof
First Claim
1. A method of operating a UPS, the method comprising:
- asserting a switch drive signal at a switch to couple an AC source at an AC input of the UPS to an AC output of the UPS through the switch;
deasserting the switch drive signal; and
then delaying provision of power from a converter circuit of the UPS coupled to the Output of the UPS until after the switch has current commutated to an off state.
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Accused Products
Abstract
A UPS is operated by deasserting a static switch drive signal, e.g., a gate signal to a thyristor, and then delaying provision of power from a converter circuit of the UPS, e.g., an inverter or other source of AC power, until after the switch has current commutated to an off state. For example, expiration of a predetermined time interval following deassertion of the switch drive signal may be detected, and the converter circuit may be enabled to drive the output of the UPS responsive to the detected expiration of the predetermined time interval. Alternatively, a current in the static switch may be detected, and the converter circuit may be enabled to drive the output of the UPS responsive to the detected current. The invention may be embodied as methods and apparatus.
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Citations
15 Claims
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1. A method of operating a UPS, the method comprising:
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asserting a switch drive signal at a switch to couple an AC source at an AC input of the UPS to an AC output of the UPS through the switch;
deasserting the switch drive signal; and
then delaying provision of power from a converter circuit of the UPS coupled to the Output of the UPS until after the switch has current commutated to an off state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An uninterruptible power supply (UPS), comprising:
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an AC input;
an AC output;
a converter circuit operative to generate an AC voltage at the AC output;
a switch operative to couple an AC source at the AC input to the AC output through the switch in an on state responsive to assertion of a switch drive signal and to decouple the AC input from the AC output in an off state responsive to a current in the switch following deassertion of the switch drive signal; and
a control circuit operative to control the converter circuit such that provision of power from the converter circuit is inhibited until the switch current commutates to the off state. - View Dependent Claims (8, 9, 10, 11)
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12. An uninterruptible power supply (UPS), comprising:
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an AC input;
an AC output;
an inverter circuit coupled to AC output and operative to generate an AC voltage at the AC output; and
a thyristor coupled between the AC input and the AC output; and
a control circuit operative to inhibit provision of power from the inverter circuit until the thyristor commutates to an off state following deassertion of a gate signal at the thyristor. - View Dependent Claims (13, 14, 15)
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Specification