US 12,095,370 B2
DC-DC converter for display panel capable of reducing area occupied by voltage-to-current converter
Xuan Dien Do, Daejeon (KR); Yoon Soo Shin, Daejeon (KR); Chang Jin Jeong, Daejeon (KR); and Jin Su Byeon, Daejeon (KR)
Assigned to LX Semicon Co., Ltd., Daejeon (KR)
Filed by LX SEMICON CO., LTD., Daejeon (KR)
Filed on Dec. 29, 2022, as Appl. No. 18/147,885.
Claims priority of application No. 10-2021-0192952 (KR), filed on Dec. 30, 2021.
Prior Publication US 2023/0216406 A1, Jul. 6, 2023
Int. Cl. G09G 3/36 (2006.01); H02M 1/00 (2006.01); H02M 3/158 (2006.01)
CPC H02M 3/158 (2013.01) [G09G 3/3696 (2013.01); H02M 1/0009 (2021.05); H02M 1/0032 (2021.05); G09G 2330/021 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A DC-DC converter, comprising:
a slope compensation circuit configured to generate a sawtooth-shaped compensation ramp wave to output a slope voltage;
a current sensing circuit configured to receive and convert a sensing current to output the converted current; and
an adder configured to receive the slope voltage and the sensing current,
wherein the adder includes a sensing resistor and a sensing switch,
one end of the sensing resistor is connected to the current sensing circuit and another end of the sensing resistor is connected to the sensing switch and the slope compensation circuit, and
one end of the sensing switch is connected to the sensing resistor and the slope compensation circuit and another end of the sensing switch is connected to a ground,
wherein the current converted from the sensing current flows through the sensing resistor to apply a sensing voltage, and the slope voltage, which is a voltage of the compensation ramp wave, is applied to one end of the sensing switch so that a voltage obtained by adding the sensing voltage and the slope voltage is applied to one end of the sensing resistor.