DRIVING CIRCUIT AND ILLUMINATION DEVICE HAVING LIGHT-EMITTING ELEMENTS

摘要

The present invention discloses a driving circuit including a rectifying circuit and a first current-controlling circuit. Input terminals of the rectifying circuit are connected to output terminals of an AC power source. The first current-controlling circuit and a plurality of light-emitting elements be driven are connected in series, and then are connected between two output terminals of the rectifying circuit. The driving circuit further includes a plurality of switches and a switch-controlling circuit; the switches are connected in parallel with two terminals of one or some light-emitting elements connected in series to form many light-emitting element subunits. Control-signal output terminals of the switch-controlling circuit are connected to control terminals of the switches respectively, to control the switches in an ON-OFF state according to an instantaneous value of a DC voltage outputted from the rectifying circuit, for controlling an amount of light-emitting elements which should be lighten.

主权项

1. A driving circuit for light-emitting elements, comprises a rectifying circuit and a first current-controlling circuit; input terminals of the rectifying circuit are connected to output terminals of an AC power source, the first current-controlling circuit and a plurality of light-emitting elements to be driven are connected in series, and then are connected between two output terminals of the rectifying circuit; wherein,
the driving circuit further comprises a plurality of switches and a switch-controlling circuit; the switches are connected in parallel with two terminals of one light-emitting elements or some light-emitting elements connected in series to form a plurality of light-emitting element subunits; control-signal output terminals of the switch-controlling circuit are connected to control terminals of the switches respectively, to control the switches in ON-OFF state according to an instantaneous value of a DC voltage outputted from the rectifying circuit, for controlling an amount of light-emitting elements to be lighten.