Alternating-current fed power supply

• US 4,084,217 A
• Filed: 04/19/1977
• Issued: 04/11/1978
• Est. Priority Date: 04/19/1977
• Status: Expired due to Term

• Current Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Brandli, Gerold, Dick, Max
• Primary Examiner(s): Shoop, William M.
• Application Number:
  US05/788,931
• Time in Patent Office: 357 Days
• Field of Search: 219/131 WR, 315/205, 315/253, 321/27 MS, 321/27 R, 321/47, 321/5, 363/67, 363/3, 363/4, 363/126
• US Class Current: 363/4
• CPC Class Codes: H02M 1/4266 using passive elements
• CPC Class Codes: H02M 7/05 Capacitor coupled rectifiers
• CPC Class Codes: H02M 7/08 arranged for operation in parallel
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An A.C. voltage fed power supply for D.C. gas-discharge lamps is disclosed having full-wave rectifying means connected on the A.C. side to at least two phase-adjusting networks for forming mutually phase-shifted partial currents and connected together on the D.C. side to superimpose the rectified, phase-shifted partial currents. Each phase-adjusting network is connected through the full-wave rectifying means to the same load impedance at the two D.C. voltage output terminals.

Claims

1. A.C. voltage fed power supply for D.C. gas-discharge lamps comprising:

full-wave rectifying means connected on the A.C. side to at least two phase-adjusting networks for forming mutually phase-shifted partial currents and connected together on the D.C. side to superimpose the rectified, phase-shifted partial currents, each phase-adjusting network being connected through the full-wave rectifying means to the same load impedance at the two D.C. voltage output terminals,

said phase-adjusting networks being purely reactive current paths, the reactance values being such that the effective values or the rectified values of the phase-shifted partial currents flowing therein to the full-wave rectifying means are equal to within ±

20%,

two Gratz rectifier circuits serving as full-wave rectifying means and wherein the phase-adjusting networks are two reactance branches, each reactance branch being symmetric, reactance-wise, with respect to the associated Gratz rectifier circuit, one of said branches connects to the A.C. terminals of the first Gratz circuit and the other of said branches connects to the A.C. terminals of the second Gratz circuit, and the D.C. terminals of like polarity of the Gratz rectifier circuits are connected together to superimpose the phase-shifted partial currents and are each connected to a D.C. output terminal of the power supply; and

,

wherein one said reactance branch has an inductance on each side of its associated Gratz rectifier circuit and the other said reactance branch has a series-connected capacitance and inductance on each side of its associated Gratz rectifier circuit and wherein the reactance values of the inductances in the same reactance branch are equal.

2. A.C. voltage fed power supply as in claim 1 wherein the two inductances of the same reactance branch have the same number of turns on the same iron core.

3. A.C. voltage fed power supply as in claim 1 wherein the magnitudes of the reactances of the reactance branches are such that the apparent power is in a reactance branch between 0.5 and 2 times that at the load.

4. A.C. voltage fed power supply as in claim 3 wherein the magnitudes of the reactances of the reactance branches are such that the apparent power in a reactance branch is 0.65 to 0.85 times that at the load.

5. A.C. voltage fed power supply as in claim 1 for operating a high-current low-voltage ultraviolet-C lamp in which the radiation is produced in a discharge tube with a discharge space and mercury/argon filling by a wall-stabilized D.C. gas-discharge at a mercury pressure between 5 ×

10^-3 and 5 ×

10^-1 Torr. and a discharge current density between 1 and 25 A/cm², and in which the cathode space is connected with the anode space through a pressure equalizing space, where the sum of the volumes of the cathode space, anode space and pressure equaliziing space is greater than the volume of the discharge space and the argon pressure is between 0.01 and 0.5 Torr..

6. A.C. voltage fed power supply for D.C. gas-discharge lamps comprising:

full-wave rectifying means connected on the A.C. side to at least two phase-adjusting networks for forming mutually phase-shifted partial current and connected together on the D.C. side to superimpose the rectified, phase-shifted partial currents, each phase-adjusting network being connected through the full-wave rectifying means to the same load impedance at the two D.C. voltage output terminals,

said phase-adjusting networks being purely reactive current paths, the reactance values being such that the effective values or the rectified values of the phase-shifted partial currents flowing therein to the full-wave rectifying means are equal to within ±

20%,

a three-phase rectifier circuit having six diode elements serving as said full-wave rectifying means and wherein said phase-adjusting networks are two reactance branches with each connected exclusively to only one A.C. voltage phase of said three phase rectifier circuit and wherein one A.C. voltage input terminal of the power supply is connected directly to the third A.C. voltage phase of the rectifier circuit,

said one reactance branch containing one inductance only and the other reactance branch having a single inductance connected in series with a single capacitance and wherein these branches are each connected from the same A.C. voltage input terminal of the power supply to one individual phase of said three-phase rectifier circuit.