Illumination device and light-emitting diode circuit

摘要

An illumination device includes a rectifier circuit, M light-emitting modules, and a control module. The rectifier circuit has a positive output terminal and a negative output terminal, and generates a driving voltage between the positive output terminal and the negative output terminal according to an input power. The M light-emitting modules are coupled between the positive output terminal and the negative output terminal. Each of the M light-emitting modules has a conduction voltage, and includes a light-emitting unit that includes at least one light-emitting diode. The control module is coupled between the rectifier circuit and the M light-emitting modules, and controls the M light-emitting modules to dynamically form S light-emitting diode strings coupled in parallel with each other. A number of the light-emitting units in each of the S light-emitting diode strings is N, in which S×N=M, where M, S, N are positive integers.

主权项

1. An illumination device, comprising:
a rectifier circuit having a positive output terminal and an negative output terminal, the rectifier circuit being configured to generate a driving voltage between the positive output terminal and the negative output terminal according to an input power; M light-emitting modules coupled between the positive output terminal and the negative output terminal, wherein each of the M light-emitting modules has a conduction voltage, and comprises a light-emitting unit that comprises at least one light-emitting diode; and a control module coupled between the rectifier circuit and the M light-emitting modules, and configured to control the M light-emitting modules to dynamically form a plurality of light-emitting diode strings coupled in parallel with each other, wherein a number of the light-emitting units in each of the light-emitting diode strings is N, and a number of the light-emitting diode strings is S, and wherein when the driving voltage is changed from one time as much as the conduction voltage to (Q+q) times as much as the conduction voltage, the N is changed from one to Q and the S is changed from M to M/Q with the change of the driving voltage, where S×N=M, and M, S, N, Q are positive integers, and 0