US 7,605,495 B2 · Dual supply circuit

Abstract

A circuit intended to provide two D.C. voltages of inverted polarities based on an A.C. voltage, comprising: two capacitors having their respective electrodes connected to two terminals intended to receive said A.C. voltage and having their second respective electrodes connected to each other by two first diodes in anti-series; a controllable current source having a first terminal connected to the common anodes of said first diodes; two second diodes connected in anti-series between said terminals intended to receive said A.C. voltage and having their common cathodes connected to a second terminal of said controllable current source; a circuit for controlling said current source; and two third diodes connected in anti-series between said terminals intended to receive said A.C. voltage, said control circuit sampling its power supply between the common cathodes of the second diodes and the common anodes of the third ones.

Claims17

Dependent claims

A circuit configured to provide two D.C. voltages of inverted polarities based on an A.C. voltage across a first A.C. terminal and a second A.C. terminal, comprising;

two first diodes having respective anodes directly connected together in common and respective cathodes;
two capacitors having respective first electrodes respectively connected to the first and second terminals of said A.C. voltage and having respective second electrodes respectively connected to the cathodes of the two first diodes;
a controllable current source having a first terminal connected to the anodes of said first diodes;
two second diodes having respective anodes connected respectively to said A.C. terminals and having respective cathodes directly connected together in common and connected to a second terminal of said controllable current source;
a first control circuit configured to control said current source;
and
two third diodes having respective anodes directly connected together in common and respective cathodes connected to said A.C. terminals, respectively, said control circuit sampling a power supply between the cathodes of the second diodes and the anodes of the third diodes.

4 more elements

A power variator, comprising:

first and second switches;
and
a driver circuit for providing first and second D.C. voltages to the first and second switches, the driver circuit including:
first and second input terminals configured to receive an A.C. voltage;
a first capacitor comprising a first electrode and a second electrode, the first electrode being connected to the first input terminal, wherein a first D.C. voltage is provided across the first capacitor;
a second capacitor comprising a first and a second electrode, the first electrode of the second capacitor being connected to the second input terminal, wherein a second D.C. voltage is provided across the second capacitor;
a first diode pair of diodes having respective anodes directly connected together in common, and respective cathodes respectively connected to the second electrodes of the first and second capacitors;
a second diode pair of diodes having respective cathodes directly connected together in common, the second diode pair coupling the first input terminal to the second input terminal;
a current regulator comprising a first terminal coupled to the anodes of the first diode pair and a second terminal coupled to the cathodes of the second diode pair;
and
a control circuit coupled to the cathodes of the second diode pair of diodes and configured to control current flowing through the current regulator.

8 more elements

Dependencies are inferred from the claim text.

Dual supply circuit

Life of this patent

Dual supply circuit

Life of this patent

Abstract

Claims17