LIGHT EMITTING DEVICE POWER SUPPLY CIRCUIT, LIGHT EMITTING DEVICE CONTROL CIRCUIT AND IDENTIFIABLE LIGHT EMITTING DEVICE CIRCUIT THEREFOR AND IDENTIFICATION METHOD THEREOF

摘要

The present invention discloses a light emitting device power supply circuit, a light emitting device control circuit and an identifiable light emitting device circuit therefor, and an identification method thereof. The light emitting device control circuit includes an operation signal generation circuit and an identification circuit. The operation signal generation circuit determines whether the light emitting device control circuit operates in an identified mode or amiss mode according to an enable signal. In the identified mode, the light emitting device control circuit operates a power stage circuit to supply an output current to an identifiable light emitting device circuit. In the miss mode, an output voltage is maintained at a predetermined level. The identification circuit determines whether the light emitting device control circuit switches from the miss mode to the identified mode according to whether the output voltage meets a condition.

主权项

1. A light emitting device power supply circuit, for identifying an identifiable light emitting device circuit to determine whether to operate in an identified mode or a miss mode and supply an output current to the identifiable light emitting device circuit in the identified mode, wherein the identified mode indicates that the identifiable light emitting device circuit is normally coupled to the light emitting device power supply circuit, and the miss mode indicates that the identifiable light emitting device circuit is not normally coupled to the light emitting device power supply circuit, the light emitting device power supply circuit comprising:
a power stage circuit, for operating at least one power switch therein according to an operation signal in the identified mode, to convert an input voltage to an output voltage, and supply the output current to the identifiable light emitting device circuit; a level control circuit, for controlling the output voltage at a predetermined level in the miss mode; an identification circuit, for determining whether the miss mode is changed to the identified mode according to whether the output voltage meets a predetermined condition, and generating an enable signal correspondingly; and an operation signal generation circuit, for generating the operation signal according to a feedback signal when the enable signal indicates the identified mode.