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US 6,212,082 B1Granted
Device of adjustment of the charge current of a storage capacitor
AssigneeSGS-Thomson Microelectronics S.A.
InventorAlain Bailly
Life of this patent
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Abstract
The present invention relates to a supply circuit with a storage capacitor and a method of control of this circuit including, across a rectifying bridge, a storage capacitor associated with a charge path and with a discharge path, in which the duration of charge periods of the storage capacitor is set, at least at steady state, to a predetermined duration.
Claims9
A supply circuit comprising:
- a rectifying bridge;
- a storage capacitor coupled across the rectifying bridge, the storage capacitor having a charge path and a discharge path, wherein the charge path includes a controllable current source;
- and
- a circuit coupled to the controllable current source to generate a first signal to be received by the controllable current source, the first signal to cause the controllable current source to charge the storage capacitor for a predetermined duration, wherein the circuit includes a comparator having one input coupled to a reference voltage, another input coupled to the storage capacitor, and an output at which the first signal is generated.
1 more element
A supply circuit comprising:
- a rectifying bridge;
- a storage capacitor coupled across the rectifying bridge, the storage capacitor having a charge path and a discharge path, wherein the charge path includes a controllable current source;
- a circuit coupled to the controllable current source to generate a first signal to be received by the controllable current source, the first signal to cause the controllable current source to charge the storage capacitor for a predetermined duration, the circuit including means for detecting the charge and discharge periods of the storage capacitor, and a comparator assembly to generate the first signal to control the value of the current issued by the controllable current source;
- wherein the comparator controls a charge period of the capacitor based on a comparison with a reference value, and compares the mean value of a detection signal having two states. indicative of the charge period and a discharge period of the storage capacitor, with a predetermined reference voltage, and wherein further the comparator is formed by an operational amplifier, connected as an integrator of the detection signal provided by a bipolar transistor controlled by the voltage across the current source, and the base of the bipolar transistor is connected, via a resistor, to a first output terminal of the current source, the detection signal being taken from the collector of the bipolar transistor, the emitter of which is connected to a second terminal of the current source.
1 more element
Dependencies are inferred from the claim text.