Driving circuit for driving light-emitting circuit, and light-emitting device having the same

摘要

A driving circuit is used for driving a light-emitting circuit including a plurality of light-emitting elements connected in series. The driving circuit includes a first silicon controlled rectifier, a first current-limiting resistor, a first resistor, a controllable switch and a control circuit. One end of the first silicon controlled rectifier is grounded, and another end thereof is connected to a driving terminal for providing a driving voltage via the first current-limiting resistor. One end of the controllable switch is connected to the light-emitting circuit, another end thereof is grounded via the first resistor, and a control end thereof is connected to a first node between the silicon controlled rectifier and the first current-limiting resistor. The control circuit is configured to perform a control operation when a voltage applied to a second node between the controllable switch and the light-emitting circuit exceeds a predetermined voltage threshold.

主权项

1. A driving circuit for driving a light-emitting circuit comprising a plurality of light-emitting elements connected in series, wherein the driving circuit comprises a first silicon controlled rectifier, a first current-limiting resistor, a first resistor, a controllable switch and a control circuit,
one end of the first silicon controlled rectifier is grounded, and another end of the first silicon controlled rectifier is connected to a driving terminal for providing a driving voltage via the first current-limiting resistor, one end of the controllable switch is connected to the light-emitting circuit, another end of the controllable switch is grounded via the first resistor, and a control end of the controllable switch is connected to a first node between the silicon controlled rectifier and the first current-limiting resistor, and the control circuit is configured to perform a control operation when a voltage applied to a second node between the controllable switch and the light-emitting circuit exceeds a predetermined voltage threshold, so as to reduce a current flowing through the light-emitting circuit.