| 摘要 |
A switch circuit for light-emitting diode is provided. The switch circuit includes a power module, a light-emitting diode module, an inductor, a first switch, a second switch and a capacitor. When the input voltage of the power module is higher than the forward bias voltage of the light-emitting diode module, the first switch is switched repeatedly and the second switch is turned off, so that the power supply can charge the inductor and/or the capacitor. When the input voltage of the power module and the storage voltage of the capacitor both are lower than the forward bias voltage of the light-emitting diode module, the first switch and the second switch are controlled to switch repeatedly and synchronously, so that the power energy of the power module or the discharge energy of the capacitor can be used to continuously charge the inductor. |
| 主权项 |
1. A switch circuit for light-emitting diode, comprising:
a power module, having a first terminal and a second terminal; a light-emitting diode module, having a first terminal and a second terminal, and the first terminal of the light-emitting diode module connected to the first terminal of the power module; an inductor, having an end connected to the second terminal of the light-emitting diode module; a first switch, having a first end connected to other end of the inductor, a control end configured to receive a first control signal, and a second end connected to the second terminal of the power module, wherein the first switch is controlled to turn on or off according to the first control signal; a second switch, having a first end connected to the first terminal of the light-emitting diode module, a control end configured to receive a second control signal control signal and a second end connected to the second terminal of the light-emitting diode module, wherein the second switch is controlled to turn on or off according to the second control signal; and a first capacitor, having an end connected to the other end of the inductor via a first diode and connected to the first terminal of the light-emitting diode module and the first end of the second switch via a second diode, and other end connected to the second terminal of the power module. |
