Regulated a.c. power supply
First Claim
1. A regulated a.c. power supply for delivering power at a regulated a.c. output through switching of secondary transformer winding taps in a manner so as to impede switching transients and momentary short circuit currents occurring during the switching process without the loss of any portion of the a.c. sine wave and without incident ill-effects of switching having an auxiliary power supply connected with an unregulated a.c. supply phase and providing regulated power of at least one discrete voltage and polarity, means for filtering noise, RFI and related undesirable and prohibitive equipment manifestations ahead of the output terminals of the subject voltage regulator and means for the protection against hazards incoming with the a.c. power line transients,comprising in combination:
- a transformer having a primary winding connected with the a.c. supply line and a secondary winding equipped with at least two taps,at least one relay having a coil and at least one single-pole, single-throw, normally-open load contact,a said relay load contact connected across each of said at least two adjacent secondary transformer winding taps,a relay control unit receiving regulated power of at least one discrete voltage and polarity,said relay control unit having means for sensing and monitoring the a.c. supply line voltage for the corresponding energizing of a said relay coil and actuating a said relay load contact individually and in a sequence with another said relay load contact, selectively.
2 Assignments
0 Petitions
Accused Products
Abstract
A voltage regulator capable of maintaining the output voltage of a unit, such as a power supply, incorporating said voltage regulator within, for example, ±5 percent of say, 115 volts, a.c., without any interruptions in the power supply output voltage and without any distortion of the a.c. sine wave.
This is accomplished through the monitoring of varying secondary transformer output voltages according to the primary input voltage variations by means of a comparator processing a signal to power relays which switch to specific secondary transformer taps without causing interruptions of the output power and without distortions of the a.c. sine wave, respectively. Various additional devices are provided to enhance the described regulated a.c. power supply performance.
-
Citations
2 Claims
-
1. A regulated a.c. power supply for delivering power at a regulated a.c. output through switching of secondary transformer winding taps in a manner so as to impede switching transients and momentary short circuit currents occurring during the switching process without the loss of any portion of the a.c. sine wave and without incident ill-effects of switching having an auxiliary power supply connected with an unregulated a.c. supply phase and providing regulated power of at least one discrete voltage and polarity, means for filtering noise, RFI and related undesirable and prohibitive equipment manifestations ahead of the output terminals of the subject voltage regulator and means for the protection against hazards incoming with the a.c. power line transients,
comprising in combination: -
a transformer having a primary winding connected with the a.c. supply line and a secondary winding equipped with at least two taps, at least one relay having a coil and at least one single-pole, single-throw, normally-open load contact, a said relay load contact connected across each of said at least two adjacent secondary transformer winding taps, a relay control unit receiving regulated power of at least one discrete voltage and polarity, said relay control unit having means for sensing and monitoring the a.c. supply line voltage for the corresponding energizing of a said relay coil and actuating a said relay load contact individually and in a sequence with another said relay load contact, selectively.
-
-
2. A regulated a.c. power supply including a voltage regulator
for regulating the a.c. output system voltage without switching all-effects and the loss of any portion of the a.c. system sine wave in a manner so as to impede switching transients and momentary short circuit currents occurring during the switching process, comprising in combination: -
a transformer, said transformer having a grounded core, a primary winding having two terminals for its connection across at least one line and the common neutral of each phase of an a.c. system and a secondary winding having a terminal for the connection with a common neutral and ground, respectively, of each phase of an a.c. system and at least two taps, each having a terminal, at least two chokes, each having a first and a second terminal, one of each said choke connected with its first said terminal to one of said at least two tap terminals, a relay having at least one single-pole, single-throw, normally-open load contact and one coil for each said relay load contact actuation, each said single-pole, single-throw, normally-open relay load contact having a first and a second terminal, one of each said first terminal connected, in series, with one of said second terminal of one said choke, a relay control unit having two pairs of auxiliary d.c. power supplies and at least five output terminals, said relay control unit having means for the sensing, the monitoring and the processing of the supply line voltage fluctuations and means for the energizing and de-energizing, selectively, of one said relay coil and for the de-energizing and energizing, selectively, of another said relay coil in a predetermined and controlled sequence so as to cause the closing of one said relay load contact, its maintaining in the closed position and to cause the closing of another relay load contact before a formerly closed relay load contact is caused to become opened, a first junction connected with all said second terminals of said single-pole, single-throw, normally-open relay load contacts, a second junction connected with said transformer neutral terminal, an auxiliary power supply having two input terminals for the connection with a phase of an unregulated a.c. system supply and a first and a second pair of output terminals, each said output terminal pair delivering regulated power of both a specific voltage and polarity orientation to the corresponding input terminals of said relay control unit, a filter network including one output line choke per phase, one common neutral line choke and a capacitor connected across the line and neutral of each phase ahead of said output line choke and a capacitor connected across the line and neutral of each phase past said output line choke.
-
Specification