AC Uninterruptible power system
First Claim
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1. A system for delivering substantially uninterruptible AC voltage comprising:
- an input means for connection to a source of AC line voltage;
an output means for connection to equipment requiring constant AC line voltage;
an AC solid state switch connected between said input and said output means;
an alternate AC power system connected between said switch and said output means;
a sensing circuit connected between said input means and switch and operative to deliver a first state signal when AC line voltage is greater than a predetermined level and to deliver a second state digital signal when AC line voltage is less than said predetermined level;
a first control circuit connected between said sensing circuit and said switch;
a second control circuit connected between said sensing circuit and said alternate power system;
means in said first control circuit to delay passage of a first state digital signal; and
means in said second control circuit to delay passage of a second state digital signal;
said switch being conditioned to be closed at any point in the AC cycle upon input of a first state digital signal and opened at any point in the AC cycle upon input of a second state digital signal; and
said alternate power system being conditioned to be activated upon input of a second state digital signal and deactivated upon input of a first state digital signal.
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Abstract
A system to provide substantially uninterruptible AC power. Line voltage is applied to a load through a solid state electronic switch. A squarewave inverter powered by batteries in connected across the load. When line power is reduced to a predetermined level, the switch opens disconnecting the line, and after a short time delay of less than a millisecond, the inverter starts. Upon restoration of normal line power, the process is reversed; the inverter stops and after a like short time delay, the switch closes reconnecting the line.
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Citations
17 Claims
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1. A system for delivering substantially uninterruptible AC voltage comprising:
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an input means for connection to a source of AC line voltage; an output means for connection to equipment requiring constant AC line voltage; an AC solid state switch connected between said input and said output means; an alternate AC power system connected between said switch and said output means; a sensing circuit connected between said input means and switch and operative to deliver a first state signal when AC line voltage is greater than a predetermined level and to deliver a second state digital signal when AC line voltage is less than said predetermined level; a first control circuit connected between said sensing circuit and said switch; a second control circuit connected between said sensing circuit and said alternate power system; means in said first control circuit to delay passage of a first state digital signal; and means in said second control circuit to delay passage of a second state digital signal; said switch being conditioned to be closed at any point in the AC cycle upon input of a first state digital signal and opened at any point in the AC cycle upon input of a second state digital signal; and said alternate power system being conditioned to be activated upon input of a second state digital signal and deactivated upon input of a first state digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification