DC voltage converter raising voltage from solar cell - comprises oscillator connected to transformer primary with Zener diode and capacitor connected to secondary winding

• Main Author: GEERT JAN NAAIJER
• Format: Patent
• Language: English; French
• Published: 24.12.1981
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The DC voltage converter has an input receiving current from a photocell (1) providing current at a low voltage. The output of the circuit comprises a diode (2) and a capacitor (3) in series, the voltage across the capacitor being connected to the DC load. Between the two circuits there is an inductance (4) subject to a varying current arising from the switching action of a controlled switch (5). The switching control circuit derives power from a resistor (10) and capacitor (11) connected in series across the source. The circuit comprises an oscillator providing output voltage peaks of several volts amplitude, and consists of a tunnel diode (15) (having negative impedance) and the primary of a step-up transformer (18). In combination with a Zener diode (22), the secondary (20) provides a sufficient voltage stored in a capacitor (21) to control the switching of a MOSFET switch (5) connected to the inductance (4) and diode (2). CONVERTISSEUR DE TENSION CONTINUE POUR TRES FAIBLES PUISSANCES COMPRENANT ESSENTIELLEMENT UN CIRCUIT DE TRANSFORMATION EN ENERGIE ELECTRIQUE D'UNE ENERGIE D'UN AUTRE TYPE, TEL QU'UNE PHOTOPILE 1, UN CIRCUIT D'UTILISATION COMPOSE D'UNE DIODE 2 ET D'UN CONDENSATEUR 3 DEVANT ALIMENTER UNE CHARGE EN COURANT CONTINU ET, ENTRE CES DEUX CIRCUITS, UNE INDUCTANCE 4 A VARIATION ALTERNATIVE DU COURANT QUI LA TRAVERSE PAR FERMETURES ET OUVERTURES SUCCESSIVES D'UN INTERRUPTEUR 5, SOUS L'ACTION D'UN CIRCUIT DE COMMUTATION COMPOSE LUI-MEME ESSENTIELLEMENT D'UNE SOURCE AUXILIAIRE DE TENSION CONTINUE ET D'AU MOINS UN CIRCUIT D'OSCILLATION. EN LUI ADJOIGNANT PAR EXEMPLE UNE DEUXIEME INDUCTANCE 124 ET UN DEUXIEME INTERRUPTEUR 125, CE CONVERTISSEUR PEUT FONCTIONNER EN ONDULEUR.APPLICATION: ALIMENTATION CONTINUE OU ALTERNATIVE DE STATIONS AUTONOMES TELLES QUE PARCMETRES, BORNES D'APPEL, BALISES, DISPOSITIFS DE SURVEILLANCE AUTOMATIQUE.