1. Field of the Invention
The present invention relates to an apparatus for controlling multiple powers for sequential supply and reversal interruption and, more particularly, to an apparatus for controlling multiple powers which is capable of sequentially turning on or reversely turning off the multiple powers in their priorities for systems or components to be supplied with the multiple powers such as a liquid crystal display (LCD) module.
2. Discussion of Related Art
Hereinafter, the supply and the interruption have the same meaning as ON and OFF, which will be used together for simplicity of description.
In general, multiple powers should be supplied to components or systems requiring the multiple powers for safe drive in a sequential manner to comply with their priorities of supplying the powers based on the respective specifications, and should be interrupted in its reversal order. To detail this, in the case of the power supply for driving the LCD module, four kinds of power supply voltage, 3.3V, 5V, −9V, and 15V, are sequentially supplied to the LCD module by respective time intervals of 10 ms, image data are then applied thereto. In addition, in the case of interrupting the power supply, it is interrupted in its reversal order.
For example, one of methods capable of performing sequential supply and reversal interruption on the multiple powers in accordance with the conventional art will be described. FIG. 1 is a circuit view of an apparatus for controlling multiple powers in accordance with the conventional art.
The apparatus for controlling the multiple powers according to the conventional art as shown in FIG. 1 is configured to sequentially switch the multiple power supply voltages by sequentially driving relays using a silicon controlled rectifier (SCR) and counter logical elements. In this configuration, a pair of counter elements, i.e., a counter element for sequential turn on and a counter element for reversal turn off are required to generate a control signal for switching one power supply voltage. An upper block including the counter element is responsible for sequential on control and a lower block is responsible for sequential off control. In addition, one SCR and two relays are required in its output terminal in order to turn off one voltage having levels different from each other in the above-described configuration.
Accordingly, in the apparatus for controlling the multiple powers according to the conventional art, the more the voltages to be controlled are present, the more logical gates and counter semiconductor elements constituted by flip-flops or latches should be used and many relays should also be used, which cause volume to be increased and control to be complicated.