UNINTERRUPTIBLE POWER SUPPLIES WITH CONVERTER OPERATION CONDITIONED UPON STATIC SWITCH COMMUTATION AND METHODS OF OPERATION THEREOF
First Claim
1. An uninterruptible power supply (UPS), comprising:
- an AC input configured to be coupled to an AC source;
an AC output;
a converter circuit operative to generate an AC voltage at the AC output;
a switch operative to couple the AC input to the AC output through the switch responsive to a first state of a switch drive signal and to decouple the AC input from the AC output responsive to second state of the switch drive signal; and
a control circuit operative to detect a current in the switch following a transition of the switch drive signal to the second state and to initiate control of the AC output by the converter circuit following the transition of the switch drive signal to the second state responsive to the detected current.
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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.
9 Citations
10 Claims
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1. An uninterruptible power supply (UPS), comprising:
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an AC input configured to be coupled to an AC source; an AC output; a converter circuit operative to generate an AC voltage at the AC output; a switch operative to couple the AC input to the AC output through the switch responsive to a first state of a switch drive signal and to decouple the AC input from the AC output responsive to second state of the switch drive signal; and a control circuit operative to detect a current in the switch following a transition of the switch drive signal to the second state and to initiate control of the AC output by the converter circuit following the transition of the switch drive signal to the second state responsive to the detected current. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a UPS comprising an AC input configured to be coupled to an AC source, an AC output and, converter circuit operative to generate an AC voltage at the AC output and a switch operative to couple the AC input to the AC output through the switch responsive to a first state of a switch drive signal and to decouple the AC input from the AC output responsive to second state of the switch drive signal, the method comprising:
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detecting a current in the switch following a transition of the switch drive signal to the second state; and initiating control of the AC output by the converter circuit following the transition of the switch drive signal to the second state responsive to the detected current. - View Dependent Claims (7, 8, 9, 10)
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Specification