CN-112467979-B - DC-DC converter

Abstract

The present disclosure provides a DC-DC converter including a sensing portion, a judging portion, a reference voltage control portion, and an output voltage control portion. The sensing part senses the output voltage to generate a sensing signal. The judging section judges a difference between the sensing signal and a first protection level. The reference voltage control unit generates a second reference voltage based on the first reference voltage and the output value of the determination unit. The output voltage control unit outputs the output voltage based on an input voltage, a feedback voltage of the output voltage, and the second reference voltage.

Inventors

• LI RUNRONG
• Pu Xingqian
• CAI CHANGXI

Assignees

• 三星显示有限公司
• 三星显示有限公司

Dates

Publication Date

20260421

Application Date

20200904

Priority Date

20190906

Claims (12)

1. 1. A DC-DC converter, comprising: A sensing unit that senses an output voltage of the DC-DC converter to generate a sensing signal; A judgment unit configured to judge a difference between the sensing signal and a first protection level; a reference voltage control unit for generating a second reference voltage based on the first reference voltage and the output value of the determination unit, and An output voltage control unit that outputs a control signal based on the feedback voltage of the output voltage and the second reference voltage to control the output voltage.
2. 2. A DC-DC converter according to claim 1, wherein, The protection state is activated when the state of the sensing signal greater than or equal to the first protection level continues during a period greater than a first period.
3. 3. A DC-DC converter according to claim 2, wherein, When the protection state is activated, the reference voltage control section generates the second reference voltage at which the sense signal does not exceed the first protection level.
4. 4. A DC-DC converter as set forth in claim 3, wherein, The protection state is deactivated when a state in which the sense signal is less than or equal to a second protection level continues during a period greater than the first period in a state in which the protection state is activated.
5. 5. A DC-DC converter as set forth in claim 3, wherein, The output voltage is changed to a pre-specified forced level when the state in which the protection state is activated continues for a period greater than the second period, the protection state being deactivated.
6. 6. A DC-DC converter according to claim 1, wherein, The judgment unit is an amplification unit that amplifies a difference between the sense signal and the first protection level to generate an amplified signal, and outputs the amplified signal to the reference voltage control unit.
7. 7. A DC-DC converter as set forth in claim 6, wherein the DC-DC converter comprises, The DC-DC converter further includes: A comparison unit for comparing the sensing signal with the first protection level indicating activation of the protection state or the second protection level indicating deactivation of the protection state to generate a comparison signal, and And a counter for accumulating the comparison signal to generate a protection activation signal.
8. 8. A DC-DC converter as set forth in claim 7, wherein, The DC-DC converter further includes: and a selecting unit configured to output either one of the first protection level and the second protection level to the comparing unit based on the protection activation signal.
9. 9. A DC-DC converter as set forth in claim 8, wherein the DC-DC converter comprises, The first protection level is greater than the second protection level.
10. 10. A DC-DC converter according to claim 1, wherein, The judgment section is a first comparison section that compares the sense signal and the first guard level to generate a first comparison signal.
11. 11. A DC-DC converter as set forth in claim 10, wherein the DC-DC converter comprises, The DC-DC converter further includes: A second comparing section for comparing the sensing signal with the first protection level indicating activation of the protection state or a second protection level indicating deactivation of the protection state to generate a second comparison signal, and And a counter that accumulates the second comparison signal to generate a protection activation signal.
12. 12. A DC-DC converter as set forth in claim 11, wherein the DC-DC converter comprises, The DC-DC converter further includes: An up-down counter for generating an up-down signal based on the first comparison signal and the protection activation signal and outputting the generated up-down signal to the reference voltage control unit, The reference voltage control unit generates the second reference voltage based on the first reference voltage, the addition/subtraction signal, and the protection activation signal.

Description

DC-DC converter Technical Field The present disclosure relates to a DC-DC converter, a DC-DC conversion method using the same, and a display device including the same. In more detail, even when an abnormality occurs in an output voltage, the output voltage of D C-DC converter is not cut off, but the level of the output voltage is changed to stably output the output voltage, a DC-DC conversion method using the same, and a display device including the same. Background The display device includes a DC-DC converter for converting a battery voltage into a direct-current voltage for a display panel. When the load increases sharply due to a short circuit or damage of the output voltage of the DC-DC converter, the DC-DC converter may be turned off in order to protect the DC-DC converter. However, for example, when the display device is used in an automobile device, if the DC-DC converter is turned off, a dangerous situation may occur during running of the automobile device because the display panel is turned off. Even if the display device is not used in the automobile device, there may be a case where the display panel is turned off as compared to that of the automobile device, but the display state needs to be maintained. Disclosure of Invention In view of this, the technical problem of the present disclosure is to provide a DC-DC converter capable of stably outputting an output voltage by changing the level of the output voltage without cutting off the output voltage of the DC-DC converter even when an abnormality occurs in the output voltage. Another object of the present disclosure is to provide a DC-DC conversion method using the DC-DC converter. Another object of the present disclosure is to provide a display device including the DC-DC converter. A DC-DC converter according to an embodiment for achieving the object of the present disclosure described above includes a sensing section, a judging section, a reference voltage control section, and an output voltage control section. The sensing part senses the output voltage to generate a sensing signal. The judging section judges a difference between the sensing signal and a first protection level. The reference voltage control unit generates a second reference voltage based on the first reference voltage and the output value of the determination unit. The output voltage control unit outputs the output voltage based on an input voltage, a feedback voltage of the output voltage, and the second reference voltage. In an embodiment of the present disclosure, the protection state may be activated when the state of the sensing signal greater than or equal to the first protection level continues for a period greater than the first period. In an embodiment of the present disclosure, the reference voltage control part may generate the second reference voltage in which the sensing signal does not exceed the first protection level when the protection state is activated. In an embodiment of the present disclosure, the protection state may be inactivated when a state in which the sensing signal is less than or equal to a second protection level continues during a period greater than the first period in a state in which the protection state is activated. In an embodiment of the present disclosure, the output voltage may be changed to a predetermined forced level when the state in which the protection state is activated continues for a period greater than the second period, the protection state being inactivated. In an embodiment of the present disclosure, the determining portion may generate an amplified signal by amplifying a difference between the sensing signal and the first protection level and output the amplified signal to the reference voltage control portion. In an embodiment of the present disclosure, the DC-DC converter may further include a comparison part comparing the sensing signal with the first protection level indicating activation of a protection state or a second protection level indicating deactivation of the protection state to generate a comparison signal, and a counter accumulating the comparison signal to generate a protection activation signal. In an embodiment of the present disclosure, the DC-DC converter may further include a selection part outputting any one of the first protection level and the second protection level to the comparison part based on the protection activation signal. In an embodiment of the present disclosure, the first protection level may be greater than the second protection level. In an embodiment of the present disclosure, the determining part may be a first comparing part that compares the sensing signal and the first protection level to generate a first comparison signal. In an embodiment of the present disclosure, the DC-DC converter may further include a second comparing part comparing the sensing signal with the first protection level indicating activation of a protection state or a second protection level indicating deac