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US 7,072,197 B2Granted
Isolated low-voltage power supply source
AssigneeSTMicroelectronics S.r.l.
InventorsBenoît Peron, Frédéric Gautier
Life of this patent
Estimating the term…
Abstract
An isolated circuit of low-voltage supply of a control circuit of a high-voltage load, in or upstream of a fullwave three-phase rectifying bridge, comprising a first low-voltage capacitor having a first electrode connected to one of the rectified output terminals of the bridge, and at least one second capacitor providing said low voltage, a first electrode of the second capacitor being connected to one of the A.C. input terminals of the bridge, the respective second electrodes of the capacitors being connected by a high-voltage diode having its cathode connected to the second capacitor.
Claims21
An isolated low-voltage supply source for a control circuit of a high-voltage load, in or upstream of a rectifying bridge, comprising:
- a first low-voltage capacitor having a first electrode connected to one of the rectified output terminals of the bridge;
- and
- at least one second capacitor providing said low voltage, a first electrode of the second capacitor being connected to one of the A.C. input terminals of the bridge, the respective second electrodes of the capacitors being connected by a high-voltage diode having its cathode connected to the second capacitor.
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit having a first node coupled to one of the input nodes and having a second node;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node coupled to the second node of the circuit and having a second node coupled to one of the input nodes;
- and
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor.
4 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor;
- a full-wave rectifier coupled to the input nodes and to the output nodes and to the circuit;
- and
- wherein the circuit is operable to control operation of the full-wave rectifier.
6 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor;
- a third capacitor having a first node coupled to the circuit and having a second node coupled to one of the input nodes;
- and
- a second diode having a first node coupled to the first node of the third capacitor and having a second node coupled to the second node of the first capacitor.
6 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor;
- a load coupled to one of the first and second input nodes;
- a switch coupled to the load;
- and
- wherein the circuit is operable to control the switch.
7 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- and
- a first diode having an anode and a cathode respectively coupled to the second node of the first capacitor and to the first node of the second capacitor.
4 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor;
- and
- a rectifier coupled to the input nodes and to the output nodes and including a second diode coupled between the first node of the first capacitor and the second nodes of the second capacitors.
5 more elements
A power supply, comprising:
- first and second input nodes operable to receive an AC voltage;
- first and second output nodes operable to provide a rectified voltage;
- a circuit coupled to one of the input nodes;
- a first capacitor having a first node coupled to one of the output nodes and having a second node;
- a second capacitor having a first node operable to provide a signal to the circuit and having a second node coupled to one of the input nodes;
- and
- a first diode having first and second nodes respectively coupled to the second node of the first capacitor and to the first node of the second capacitor;
- and
- a rectifier coupled to the input nodes and to the output nodes and including a second diode having a cathode coupled to the second node of the second capacitor and having an anode coupled to the first node of the first capacitor.
6 more elements
A method, comprising:
- charging a second capacitor with a first capacitor when a first input node is positive relative to a second input node, the second capacitor having a first node coupled to a first node of the first capacitor and having a second node bidirectionally coupled to the second input node, the first capacitor having a second node coupled to an output node of a rectifier that is coupled to the first and second input nodes;
- and
- electrically isolating the first node of the first capacitor from the first node of the second capacitor when the first input node is negative relative to the second input node.
A method, comprising:
- charging a second capacitor with a first capacitor when a first input node is positive relative to a second input node, the second capacitor having a first node coupled to a first node of the first capacitor and having a second node coupled to the second input node, the first capacitor having a second node coupled to an output node of a rectifier that is coupled to the first and second input nodes;
- electrically isolating the first capacitor from the second capacitor when the first input node is negative relative to the second input node;
- wherein charging the first capacitor comprises forward biasing a diode that coupled between the respective first nodes of the first and second capacitors;
- and
- wherein electrically isolating the first capacitor from the second capacitor comprises reverse biasing the diode.
2 more elements
Dependencies are inferred from the claim text.