Light emitting diode driving apparatus with switch control circuit
AssigneeSemisilicon Technology Corp.
InventorWen-Chi Peng
Life of this patent
Estimating the term…
Abstract
A light emitting diode driving apparatus includes a control unit, a switch control circuit, a signal switch unit and a control power unit. The control power unit, the signal switch unit and a plurality of light emitting diode units are connected in series. The control power unit supplies power to the control unit. The control unit controls the switch control circuit to turn on the signal switch unit, so that a direct current power is through the signal switch unit to form a high-level part of a lighting signal for driving the light emitting diode units. The control unit controls the switch control circuit to turn off the signal switch unit, so that a low-level part of the lighting signal is formed.
Claims12
A light emitting diode driving apparatus applied to a plurality of light emitting diode units, the light emitting diode driving apparatus comprising:
- a control unit;
- a switch control circuit electrically connected to the control unit;
- a signal switch unit electrically connected to the control unit, the switch control circuit and the light emitting diode units;
- and
- a control power unit configured to receive a direct current power to provide the control unit with a working power, the control power unit electrically connected to the control unit, the switch control circuit and the signal switch unit,
- wherein the control power unit, the signal switch unit and the light emitting diode units are connected in series;
- wherein the control unit is configured to control the switch control circuit to switch a turned-on status and a turned-off status of the signal switch unit to generate a lighting signal to drive the light emitting diode units;
- when the signal switch unit is turned on, the direct current power is through the signal switch unit to form a high level part of the lighting signal;
- when the signal switch unit is turned off, the direct current power is not through the signal switch unit, so that a low level part of the lighting signal is formed;
- wherein the control power unit comprises:
- a control-side zener diode electrically connected to the control unit, the switch control circuit and the signal switch unit;
- and
- a control-side capacitor electrically connected to the control unit, the switch control circuit, the signal switch unit and the control-side zener diode,
- wherein the control-side capacitor is connected to the control unit and the control-side zener diode in parallel;
- and
- wherein the control-side zener diode, the signal switch unit and the light emitting diode units are connected in series;
- and the control-side zener diode is configured to receive and clamp the direct current power to supply power to the control unit.
Dependencies are inferred from the claim text.