Power supply unit and organic light emitting display including the same
First Claim
1. A power supply unit including:
- a DC-DC converter including a first power generation unit, an output terminal, a sensing circuit unit between the first power generation unit and the output terminal, and a resistor coupling terminal coupled to the sensing circuit unit, wherein the sensing circuit unit includes a sensing resistor and wherein the first power generation unit includes a switch controller configured to stop driving of the first power generation unit; and
an external resistor located outside the DC-DC converter and coupled to the resistor coupling terminal,wherein the first power generation unit is configured to output a current to the output terminal, the sensing circuit unit is configured to cause a stop in operation of the first power generation unit based on a value of a current flowing in the sensing resistor exceeding a predetermined value, wherein the predetermined value is adjustable based on a selected value of the external resistor, and wherein the output terminal is configured to output a first power,wherein the sensing circuit unit further includes;
a first resistor connected to a common node between the first power generation unit and the sensing resistor, and a first node,a first transistor connected to the first node and the resistor coupling terminal,an operational amplifier configured to control the first transistor using a reference voltage and a voltage of the resistor coupling terminal which are input, anda comparator configured to supply a driving stop signal to the switch controller of the first power generation unit if both a voltage of the output terminal and a voltage of the first node are identical.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a power supply unit including a DC-DC converter including an output terminal and resistor coupling terminal and an external resistor coupled to the resistor coupling terminal, where the DC-DC converter includes a first power generation unit which outputs a predetermined current to the output terminal, and a sensing circuit unit that includes a sensing resistor located between the first power generation unit and the output terminal and stops an operation of the first power generation unit depending on a current value flowing in the sensing resistor. A power supply unit and an organic light emitting display including the power supply unit include a sensing circuit unit that stops operation of the power supply unit to prevent an additional damage when an abnormal current occurs.
16 Citations
12 Claims
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1. A power supply unit including:
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a DC-DC converter including a first power generation unit, an output terminal, a sensing circuit unit between the first power generation unit and the output terminal, and a resistor coupling terminal coupled to the sensing circuit unit, wherein the sensing circuit unit includes a sensing resistor and wherein the first power generation unit includes a switch controller configured to stop driving of the first power generation unit; and an external resistor located outside the DC-DC converter and coupled to the resistor coupling terminal, wherein the first power generation unit is configured to output a current to the output terminal, the sensing circuit unit is configured to cause a stop in operation of the first power generation unit based on a value of a current flowing in the sensing resistor exceeding a predetermined value, wherein the predetermined value is adjustable based on a selected value of the external resistor, and wherein the output terminal is configured to output a first power, wherein the sensing circuit unit further includes; a first resistor connected to a common node between the first power generation unit and the sensing resistor, and a first node, a first transistor connected to the first node and the resistor coupling terminal, an operational amplifier configured to control the first transistor using a reference voltage and a voltage of the resistor coupling terminal which are input, and a comparator configured to supply a driving stop signal to the switch controller of the first power generation unit if both a voltage of the output terminal and a voltage of the first node are identical. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An organic light emitting display including:
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a plurality of pixels supplied with each of a scan signal, a data signal and a first power; a scan driving unit for supplying the scan signal to the pixels through a scan line; a data driving unit for supplying the data signal to the pixels through a data line; and a power supply unit including a DC-DC converter including a first power generation unit, an output terminal, a sensing circuit unit between the first power generation unit and the output terminal, a resistor coupling terminal coupled to the sensing circuit unit, and an external resistor located outside the DC-DC converter and coupled to the resistor coupling terminal, the first power generation unit configured to output a current to the output terminal and including a switch controller configured to stop driving of the first power generation unit, the sensing circuit unit including a sensing resistor and configured to cause a stop in operation of the first power generation unit based on a value of a current flowing in the sensing resistor exceeding a predetermined value, wherein the predetermined value is adjustable based on a selected value of the external resistor, the output terminal configured to output the first power, the resistor coupling terminal configured to supply the first power to the pixels, wherein the sensing circuit unit further includes; a first resistor connected between a common node between the first power generation unit and the sensing resistor, and a first node, a first transistor connected between the first node and the resistor coupling terminal, an operational amplifier configured to control the first transistor using a reference voltage and a voltage of the resistor coupling terminal which are input, and a comparator configured to supply a driving stop signal to the switch controller of the first power generation unit if a voltage of the output terminal and a voltage of the first node are identical. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification