Voltage conversion circuit and display device

Patent metadata

Field	Value
Publication number	US-11942864-B2
Application number	US-202117414348-A
Country	US
Kind code	B2
Filing date	May 13, 2021
Priority date	Dec 31, 2020
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A voltage conversion circuit and a display device are provided. The voltage conversion circuit includes a voltage conversion module, a comparison module, and a control module. The voltage conversion module includes at least two voltage conversion units, and the voltage conversion unit converts the input voltage into a target voltage. The comparison module compares each of testing voltages with a reference voltage to generate a feedback signal. The control module receives the feedback signal and controls the voltage conversion unit to convert the input voltage to the target voltage based on the feedback signal.

First claim

What is claimed is:

1. A voltage conversion circuit, comprising:
a voltage conversion module receiving an input voltage, wherein the voltage conversion module comprises at least two voltage conversion units, and the voltage conversion module is configured to convert the input voltage into a target voltage;
a comparison module electrically connected to the voltage conversion module, wherein the comparison module receives a reference voltage, and the comparison module acquires a testing voltage of each of the voltage conversion units, and compares each of the testing voltages with the reference voltage to generate a feedback signal; and
a control module electrically connected to the voltage conversion module and the comparison module, wherein the control module receives the feedback signal and controls the voltage conversion module to convert the input voltage to the target voltage based on the feedback signal;
wherein the voltage conversion circuit comprises a first voltage conversion unit and a second voltage conversion unit;
wherein the comparison module acquires a first testing voltage of the first voltage conversion unit and a second testing voltage of the second voltage conversion unit, and compares the first testing voltage and the second testing voltage with the reference voltage respectively to generate the feedback signal;
wherein the control module receives the feedback signal, outputs a first control signal to the first voltage conversion unit and outputs a second control signal to the second voltage conversion unit based on the feedback signal for controlling the first voltage conversion unit and the second voltage conversion unit to convert the input voltage to the target voltage;
wherein the first voltage conversion unit comprises a first transistor, a first inductor, a first capacitor, a first diode and a first resistor, the second voltage conversion unit comprises a second transistor, a second inductor, a second capacitor, a second diode and a second resistor;
wherein a gate of the first transistor receives the first control signal, a source of the first transistor, a first end of the first inductor, and an anode of the first diode are electrically connected, a drain of the first transistor and a first end of the first resistor are electrically connected to a first testing voltage output terminal, the first testing voltage output terminal is configured for outputting the first testing voltage, a second end of the first inductor receives the input voltage, a second end of the first resistor and a first end of the first capacitor are connected to a grounding end, and a cathode of the first diode and a second end of the first capacitor are connected to a target voltage output terminal;
wherein a gate of the second transistor receives the second control signal, a source of the second transistor, a first end of the second inductor, and an anode of the second diode are electrically connected, a drain of the second transistor and a first end of the second resistor are electrically connected to a second testing voltage output terminal, the second testing voltage output terminal is configured for outputting the second testing voltage, a second end of the second inductor receives the input voltage, a second end of the second resistor and a first end of the second capacitor are connected to the grounding end, and a cathode of the second diode and a second end of the second capacitor are connected to the target voltage output terminal.

2. The voltage conversion circuit according to claim 1 , wherein when the first testing voltage and the second testing voltage are both less than the reference voltage, the control module controls either the first voltage conversion unit or the second voltage conversion unit to operate for converting the input voltage to the target voltage.

3. The voltage conversion circuit according to claim 1 , wherein when the first testing voltage and the second testing voltage are both greater than the reference voltage, the control module controls the first voltage conversion unit and the second voltage conversion unit to simultaneously operate for converting the input voltage to the target voltage.

4. The voltage conversion circuit according to claim 1 , wherein the first testing voltage is same as the second testing voltage.

5. The voltage conversion circuit according to claim 1 , wherein the first testing voltage is different from the second testing voltage.

6. The voltage conversion circuit according to claim 1 , wherein the comparison module comprises a first comparator and a second comparator;
wherein a first input terminal of the first comparator receives the reference voltage, a second input terminal of the first comparator receives the first testing voltage, and the first comparator outputs a first level signal according to the reference voltage and the first testing voltage;
wherein a first input terminal of the second comparator receives the reference voltage, a second input terminal of the second comparator receives the second testing voltage, and the second comparator outputs a second level signal according to the reference voltage and the second testing voltage.

7. The voltage conversion circuit according to claim 6 , wherein the feedback signal comprises the first level signal and the second level signal.

8. The voltage conversion circuit according to claim 6 , wherein the comparison module further comprises an AND gate;
wherein the AND gate is electrically connected to the first comparator and the second comparator, a first input terminal of the AND gate receives the first level signal, a second input terminal of the AND gate receives the second level signal, and the AND gate outputs the feedback signal according to the first level signal and the second level signal.

9. The voltage conversion circuit according to claim 1 , wherein the voltage conversion circuit further comprises a boost chip, and the control module and the comparison module are integrated in the boost chip.

10. A display device, comprising a voltage conversion circuit, wherein the voltage conversion circuit comprises:
a voltage conversion module receiving an input voltage, wherein the voltage conversion module comprises at least two voltage conversion units, and the voltage conversion module is configured to convert the input voltage into a target voltage;
a comparison module electrically connected to the voltage conversion module, wherein the comparison module receives a reference voltage, and the comparison module acquires a testing voltage of each of the voltage conversion units, and compares each of the testing voltages with the reference voltage to generate a feedback signal; and
a control module electrically connected to the voltage conversion module and the comparison module, wherein the control module receives the feedback signal and controls the voltage conversion module to convert the input voltage to the target voltage based on the feedback signal;
wherein the voltage conversion circuit comprises a first voltage conversion unit and a second voltage conversion unit;
wherein the comparison module acquires a first testing voltage of the first voltage conversion unit and a second testing voltage of the second voltage conversion unit, and compares the first testing voltage and the second testing voltage with the reference voltage respectively to generate the feedback signal;
wherein the control module receives the feedback signal, outputs a first control signal to the first voltage conversion unit and outputs a second control signal to the second voltage conversion unit based on the feedback signal for controlling the first voltage conversion unit and the second voltage conversion unit to convert the

Assignees

• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Li Wenfang

Classifications

• H02M3/158 Primary

  including plural semiconductor devices as final control devices for a single load · CPC title

• G09G3/006

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• H02M3/1584

  with a plurality of power processing stages connected in parallel · CPC title

• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• H02M3/00

  Conversion of DC power input into DC power output · CPC title