DC-DC converter and organic light emitting display including the same
First Claim
Patent Images
1. A DC-DC converter, comprising:
- a boost converter including a first switching element, a second switching element, and a first inductor;
an inverting converter including a third switching element, a fourth switching element, and a second inductor;
a switching controller for controlling the first, second, third, and fourth switching elements; and
a current sensing unit for sensing an amount of current that flows through the first inductor and for supplying a first limit signal to the switching controller if the amount of sensed current is greater than or equal to a first reference current amount,wherein the switching controller controls the first switching element and the second switching element to reduce the amount of current that flows through the first inductor if the first limit signal is received and turns off the first switching element and the second switching element if the first limit signal is supplied more than a reference number of times within a first reference time.
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Abstract
A DC-DC converter and an organic light emitting display including the same are disclosed. The DC-DC converter generates first and second power voltages for the organic light emitting display with an inverting converter and a boost converter. The current of the converters is monitored, and if the currents exceed a threshold, the associated converter is stopped to prevent further damage to the display.
17 Citations
24 Claims
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1. A DC-DC converter, comprising:
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a boost converter including a first switching element, a second switching element, and a first inductor; an inverting converter including a third switching element, a fourth switching element, and a second inductor; a switching controller for controlling the first, second, third, and fourth switching elements; and a current sensing unit for sensing an amount of current that flows through the first inductor and for supplying a first limit signal to the switching controller if the amount of sensed current is greater than or equal to a first reference current amount, wherein the switching controller controls the first switching element and the second switching element to reduce the amount of current that flows through the first inductor if the first limit signal is received and turns off the first switching element and the second switching element if the first limit signal is supplied more than a reference number of times within a first reference time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An organic light emitting display, comprising:
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a pixel unit coupled to scan lines and data lines and including pixels that receive a first power voltage and a second power voltage; a scan driver for supplying scan signals to the pixels through the scan lines; a data driver for supplying data signals to the pixels through the data lines; and a DC-DC converter for generating the first power voltage and the second power voltage and configured to supply the generated first and second power voltages to the pixel unit, wherein the DC-DC converter comprises; a boost converter including a first switching element, a second switching element, and a first inductor; an inverting converter including a third switching element, a fourth switching element, and a second inductor; a switching controller for controlling the first, second, third, and fourth switching elements; and a current sensing unit for sensing the amount of current that flows through the first inductor and for supplying a first limit signal to the switching controller if the amount of sensed current is greater than or equal to a first reference current amount, wherein the switching controller controls the first switching element and the second switching element to reduce the amount of current that flows through the first inductor if the first limit signal is received and turns off the first switching element and the second switching element if the first limit signal is supplied more than a reference number of times within a first reference time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification