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Current signal generator and method of implementing such a generator

  • US 9,584,037 B2
  • Filed: 09/21/2012
  • Issued: 02/28/2017
  • Est. Priority Date: 09/22/2011
  • Status: Active Grant
First Claim
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1. A generator of current signals, suitable to gating pulses of regulated current of alternating polarity under high voltage to the terminals of a load, said generator comprising:

  • a plurality of circuits, so-called secondary stages,each secondary stage including at least one source of DC voltage isolated from the voltage sources of the other secondary stages, and a switching circuit comprising four switches arranged in first and second half-bridges each formed of two switches connected in series between the positive pole and the negative pole of the voltage source,the secondary stages being interconnected in such a way that the midpoint of the second half-bridge of each secondary stage is linked to the midpoint of the first half-bridge of the following secondary stage, the terminals of the load being respectively linked to the midpoint of the first half-bridge of a first secondary stage and to the midpoint of the second half-bridge of a last secondary stage, anda control circuit,select a group of secondary stages, so-called active stages, depending on a set point of a current flowing in the load,select from said active stages at least one stage, the so-called regulation stage,control simultaneously the switches of each active stage, with the exception of the regulation stage, at the frequency of, and synchronously with, the gating pulses of current, so as to place the voltage sources of these stages in series,control the switches of said regulation stage in accordance with a frequency higher than the preceding frequency, with a control duty cycle that is suitable to regulate the current flowing in the load to the set point,control the switches of the non-selected secondary stages, in order to isolate their voltage source,whereinthe voltage source of each secondary stage includes a secondary winding of a three-phases transformer fed by a primary stage, a diode rectifier bridge including six diodes and a filter capacitor.

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