Device for charging at a predetermined voltage, an element for storing electrical power

Claim 1

A device for charging, at a predetermined voltage, an element for storing electrical energy, comprising: a. an electrical direct current source, b. an induction coil comprising a primary winding whose end are connected respectively to the terminals of the said source to provide a current for charging that coil and a secondary winding whose ends are connected respectively to the terminals of the said storing element, c. a transistor comprising two main electrodes and an auxiliary electrode for the controlling thereof, that transistor being connected by its main electrodes in series with the said primary winding in the charging circuit of the said coil; d. a control circuit suitable for biasing the auxiliary electrode of the said transistor; e. a rectifier connected in series between the said secondary winding and the said storing element; f. a circuit-breaker sensitive to the charging voltage of the said storing element for stopping the charging of that storing element when that voltage reaches the said predetermined voltage, affecting the said control circuit to block the said transistor; g. first means sensitive to the charging current of the said coil for controlling the blocking of the said circuit-breaker when the intensity of that current exceeds a first predetermined threshold, said first means comprising: 1. a resistor in series with the charging circuit of the said coil, 2. a threshold circuit suitable for comparing the voltage at the terminals with a reference voltage, the output of the said threshold circuit being connected to a first input of the said control circuit, 3. second means sensitive to the discharge current of the coil in the said storing element for maintaining the blocking of the said transistor, said second means comprising a third winding magnetically coupled with the primary and secondary windings of the coil, said third winding being connected to a second input of the said control circuit, 4. the said control circuit being adapted for controlling the conducting of the said transistor when the said first and second means are inoperative, characterized in that it comprises, moreover, third means sensitive to the charging voltage of the said storing element and connected to the said threshold circuit for controlling the blocking of the said transistor when the intensity of the charging current exceeds a second determined threshold lower than the said first threshold, said third means acting when the charging voltage of the storing element exceeds another predetermined voltage lower than the sAid predetermined voltage.

Claim 2

A device for charging, at a predetermined voltage, an element for storing electrical energy, comprising: a. an electrical direct current source, b. an induction coil comprising a primary winding whose end are connected respectively to the terminals of the said source to provide a current for charging that coil and a secondary winding whose ends are connected respectively to the terminals of the said storing element, c. a transistor comprising two main electrodes and an auxiliary electrode for the controlling thereof, that transistor being connected by its main electrodes in series with the said primary winding in the charging circuit of the said coil; d. a control circuit suitable for biasing the auxiliary electrode of the said transistor; e. a rectifier connected in series between the said secondary winding and the said storing element; f. a circuit-breaker sensitive to the charging voltage of the said storing element for stopping the charging of that storing element when that voltage reaches the said predetermined voltage, affecting the said control circuit to block the said transistor; g. first means sensitive to the charging current of the said coil for controlling the blocking of the said circuit-breaker when the intensity of that current exceeds a first predetermined threshold, said first means comprising: 1. a resistor in series with the charging circuit of the said coil, 2. a threshold circuit suitable for comparing the voltage at the terminals with a reference voltage, the output of the said threshold circuit being connected to a first input of the said control circuit, 3. second means sensitive to the discharge current of the coil in the said storing element for maintaining the blocking of the said transistor, said second means comprising a third winding magnetically coupled with the primary and secondary windings of the coil, said third winding being connected to a second input of the said control circuit, 4. the said control circuit being adapted for controlling the conducting of the said transistor when the said first and second means are inoperative, characterized in that it comprises, moreover, third means sensitive to the charging voltage of the said storing element and connected to the said threshold circuit for controlling the blocking of the said transistor when the intensity of the charging current exceeds a second determined threshold lower than the said first threshold, said third means acting when the charging voltage of the storing element exceeds another predetermined voltage lower than the sAid predetermined voltage.