Abstract: A direct-current voltage conversion circuit and a liquid crystal display device are disclosed. The direct-current voltage conversion circuit includes a control chip, a conversion circuit and a protection circuit, wherein, the control chip is electrically connected to the conversion circuit, the control chip generates a control signal and an original voltage signal; the conversion circuit receives the control signal and the original voltage signal, and under a controlling of the control signal, obtaining a direct-current voltage signal according to the original voltage signal; the protection circuit detects if the conversion circuit generates an abnormality according to the direct-current voltage signal, and turning off the conversion circuit when the conversion circuit generates the abnormality.

Abstract: The control circuit for a DC-DC converter includes a differential amplifier and an oscillator, and also a multiplier and a voltage divider circuit. The multiplier has a first input terminal receiving a feedback voltage derived from an output voltage of the DC-DC converter through the voltage divider circuit, a second input terminal receiving a parameter compensation value, and an output terminal connected to a first input terminal of the differential amplifier. A second input terminal of the differential amplifier receives a reference voltage. The differential amplifier provides a differential signal to the oscillator. The oscillator is connected to a switch driver module of the DC-DC converter so as to provide an output signal whose frequency is proportional to the differential signal. The control circuit is able to effectively reduce response time, achieve fast transient transition, and significant enhance system reliability.

Abstract: The supplemental circuit is for a power supply equipped with a power management integrated circuit (PMIC). The supplemental circuit includes a detection circuit producing input signals, a switch, a signal generation circuit producing a control signal controlling the switch's open and close according to the input signals, and a RC circuit. When the switch is closed, the PMIC and the RC circuit are series-connected to ground. The supplemental circuit resolves the reduced performance of the PMIC due to the field effect transistors (FETs) inside the PMIC suffering greater switching loss when the PMIC is constantly series-connected to ground through RC circuit.

Abstract: The present invention provides a common voltage generating circuit, which is applied to a liquid crystal display circuit and comprises M common voltage generating sub-circuits. The liquid crystal display circuit comprises a data-driving chip, a row-driving chip, a thin film transistor (TFT) array, and a liquid crystal unit array corresponding to the TFT array. The row-driving chip is used to for opening the TFT array row-by-row through scanning lines. The data-driving chip is used for charging one row of the liquid crystal unit corresponding one row of TFT through data lines. N input terminals of a first common voltage generating sub-circuit respectively connect with adjacent N data lines output from the data-driving chip, an output terminal of the first common voltage generating sub-circuit connects with a common terminal of the liquid crystal unit corresponding to the N data lines, N is an even number.

Abstract: Disclosed is a feedback control circuit and a power management module, wherein the feedback control circuit includes a sample analysis circuit, a comparison circuit and a switch control circuit, and the sample analysis circuit samples an output signal of the power management chip, and analyzes a variation trend of the output signal to obtain a first output signal; the comparison circuit compares the first output signal and a reference signal to obtain a second output signal; the switch control circuit comprises a Pulse Width Modulation PWM control circuit and a switch, wherein the PWM control circuit is coupled to the comparison circuit and the switch control circuit, and the switch is coupled to the power management chip, and the switch control signal adjusts a duty ratio of the switch according to the second output signal to adjust a compensation duration of the output signal of the power management chip.

Abstract: The present disclosure provides a voltage controlling circuit of a T-CON load variation, a display panel and a display device. The voltage controlling circuit of the T-CON load variation includes: a power source chip and a voltage controlling circuit, and the voltage controlling circuit includes a photoelectric coupler, a first comparator, a second comparator, a first field effect transistor and a second field effect transistor. Therefore, the technical scheme of the present disclosure has an advantage that the Vcore may automatically vary with a variation of the load.

Abstract: The present invention provides a DC topology circuit, which provides a subtractor in the control chip and a control module which is electrically connected with the output terminal of the subtractor. The two input terminals of the subtractor are respectively inputted with the input voltage and the load-rated voltage, and the input voltage and the load-rated voltage are subtracted by the subtractor. The control module controls the conduction or not of the plurality of field effect transistors according to the operation result, so that the DC topology circuit enters the different working mode, when the load uses the same connection port and communication protocol, the DC topology circuit can supply different loads with different rated voltages, and increase the application range of the DC topology circuit.

Abstract: The present invention discloses a driving circuit and a liquid crystal display device. The driving circuit has: a first to fourth diodes, a first and second capacitors, and an adjustable voltage source, An anode of the first diode inputs a voltage, cathodes of the first to third diodes are connected to anodes of the second to fourth diodes, a cathode of the fourth diode outputs a voltage, a first end of the first capacitor is connected to a common end of the first diode and the second diode, a second end of the first capacitor is connected to an output terminal of the adjustable voltage source, and a selective terminal thereof is used to input a selective voltage; when an input voltage is not changed, the selective voltage is different and an output voltage is different. The above-mentioned method can provide multiple different output voltages to meet with client's requirements.

Abstract: The embodiment of the present invention discloses a loop compensation circuit and a switching power supply circuit. The loop compensation circuit can comprise: a voltage detection circuit, a control chip and a RC circuit, and the voltage detection circuit is coupled to a voltage generation circuit, and employed to detect a variation of an output voltage of the voltage generation circuit; the control chip is respectively coupled to the voltage detection circuit and the RC circuit, and employed to detect a response speed of the loop compensation circuit and to adjust a parameter of the RC circuit according to the response speed of the loop compensation circuit and the variation of the output voltage of the voltage generation circuit for adjusting the response speed of the loop compensation circuit.

Abstract: The DC voltage conversion circuit includes a booster circuit and a protection circuit. The booster circuit receives a first voltage, converts the first voltage into a second voltage, and provides the second voltage to a VGH line of a LCD device. The protection circuit includes a detection unit, a current-voltage conversion unit, a comparison unit, and a control unit. The detection unit detects a current flowing between the VGH line and a transmission line and obtains a detection current. The detection current is converted into a detection voltage by the current-voltage conversion unit. The comparison unit compares the detection voltage against a reference voltage. When the detection voltage is greater, the control unit issues a control signal to turn off the booster circuit. The transmission line is one of a VGL line and a VCOM line of the LCD device.

Abstract: The present invention provides a liquid crystal display panel common voltage adjustment circuit and a liquid crystal display device. The liquid crystal display panel common voltage adjustment circuit adjusts a first common voltage applied to a liquid crystal display panel, and comprises a collect unit, a control unit, a feedback unit and an operation adjustment unit, and the collect unit collects a common voltage of the liquid crystal display panel to be a second common voltage, and the control unit receives the second common voltage, and sends a control signal according to a difference value of the second common voltage and a standard common voltage, and the feedback unit outputs a corresponding feedback voltage under control of the control signal, and the operation adjustment unit adjusts the first common voltage according to the feedback voltage, and outputs the first common voltage after adjustment.

Abstract: The present disclosure relates to a control circuit of the switching power supply including a soft-booting voltage generation circuit, a first comparator, a voltage selection circuit, a switching circuit, a second comparator, an error amplification circuit, and a pulse signal control circuit. During the soft-booting phase and during the operational phase, different superposition voltages are superposed with the control voltage by the voltage selection circuit to obtain the clamping voltage. Thus, different clamping voltages are configured during the soft-booting phase and the operational phase, which contributes to the system stability. In addition, when the output voltage of the switching circuit is greater than the reference voltage, the second comparator outputs the first high level signals to the clock signal generator. The clock signal generator then stops operations, that is, and the control circuit of the switching power supply is in the sleep mode, which enhances the efficiency of the power.

Abstract: The invention provides a voltage stabilizing device. In the voltage stabilizing device, a signal detecting and amplifying circuit detects an operating voltage of the functional circuit, amplifies the detected operating voltage and outputs the amplified voltage signal to a logic processing circuit; the logic processing circuit adjusts a first control signal according to the amplified voltage signal and outputs the adjusted first control signal to a feedback voltage signal generating circuit; the feedback voltage signal generating circuit adjusts a feedback voltage signal according to the adjusted first control signal and outputs the adjusted feedback voltage signal to the logic processing circuit. Moreover, the logic processing circuit further adjusts a second control signal according to the adjusted feedback voltage signal and outputs the adjusted second control signal to the functional circuit, and thereby controls an output voltage of the functional circuit to be kept stable.

Abstract: The present application discloses a display panel and an angle-cutting circuit. The angle-cutting circuit includes the angle-cutting chip, the comparison module and the adjustment module, the adjustment module is coupled to the angle-cutting chip and the comparison module; the output terminal of the angle-cutting chip is used to output the angle-cutting voltage, the first input terminal of the comparison module is coupled to the output terminal of the angle-cutting chip to obtain the first voltage; the first voltage is compared to the preset threshold voltage in the comparison module, when the first voltage is less than the threshold voltage, a control signal is generated from the comparison module, and the lower limit value of the angle-cutting voltage is raised by the adjustment module according to the control signal. By the technology described above, the accuracy of angle-cutting voltage of the present application is increased, and improve product performance.

Abstract: The absorption circuit of the present invention is applied in a feed circuit, wherein the absorption circuit comprises a comparison unit and a regulation unit, and the comparison unit is employed to receive a voltage of a transformer primary dotted terminal of the feed circuit, and to compare the voltage with a first preset voltage and a second preset voltage and to output a comparison result, and the regulation unit is employed to regulate a resistor and a capacitor coupled to the transformer according to the comparison result, wherein the first preset voltage is larger than the second preset voltage. Therefore, the present invention can control the resistor and the capacitor coupled to the transformer according to the leakage inductance (i.e. the voltage) of the transformer, and then to adaptively restrain the corresponding voltage peak and EMI.

Abstract: The invention provides a protection circuit applied in an inductive boost converter, the inductive boost converter includes a transmission circuit and a charging circuit, the protection circuit includes a detection circuit and a control circuit, an input terminal of the detection and an output terminal of the transmission circuit are connected, a first output terminal of the detection circuit and an input terminal of the charging circuit are connected, a second output terminal of the detection circuit and an input terminal of the control terminal are connected; the detection circuit detects whether an input current from the transmission circuit is a short-circuit current, if the circuit is shorted, the result will be sent to the control circuit, the control circuit cuts the connection of the charging circuit and ground, which can prevent charges stored in the charging circuit from flowing backward into the input terminal of the inductive boost converter.

Abstract: The present disclosure relates to a control circuit of the switching power supply including a soft-booting voltage generation circuit, a first comparator, a voltage selection circuit, a switching circuit, a second comparator, an error amplification circuit, and a pulse signal control circuit. During the soft-booting phase and during the operational phase, different superposition voltages are superposed with the control voltage by the voltage selection circuit to obtain the clamping voltage. Thus, different clamping voltages are configured during the soft-booting phase and the operational phase, which contributes to the system stability. In addition, when the output voltage of the switching circuit is greater than the reference voltage, the second comparator outputs the first high level signals to the clock signal generator. The clock signal generator then stops operations, that is, and the control circuit of the switching power supply is in the sleep mode, which enhances the efficiency of the power.

Abstract: The present invention provides a direct current to direct current converter circuit, which comprises: a first energy storage module, a second energy storage module, a current regulator module, and a current detection module. The first energy storage module outputs current via the second energy storage module; the current detection module detects the value of outputting current of the second energy storage module, and sends feedback signals in accordance with the value of outputting current of the second energy storage module; and the current regulator module receives the feedback signals, and regulates the peak value of outputting current of the first energy storage module in accordance with the feedback signals. Thereby the direct current to direct current converter circuit can achieve the purpose of controlling the values of the outputting current and improving the efficiency and stability.

Abstract: A driver signal control circuit for a display panel is proposed. A timing controller is connected to an input terminal of a gate voltage shaping controller and a first FET. A first output terminal of the gate voltage shaping controller is connected to a gate of the first FET. A drain of the first FET is connected to the output terminal of the control circuit. A second output terminal of the gate voltage shaping controller is connected to a gate of the second FET, and a source of the second FET is connected to the output terminal of the control circuit. A second terminal of the discharge passage is connected to an output terminal of the control circuit. The control circuit effectively prevents the production costs when display panels with different production batches are fabricated using different fabrication processes.

Abstract: A direct-current voltage conversion circuit and a liquid crystal display device are disclosed. The direct-current voltage conversion circuit includes a control chip, a conversion circuit and a protection circuit, wherein, the control chip is electrically connected to the conversion circuit, the control chip generates a control signal and an original voltage signal; the conversion circuit receives the control signal and the original voltage signal, and under a controlling of the control signal, obtaining a direct-current voltage signal according to the original voltage signal; the protection circuit detects if the conversion circuit generates an abnormality according to the direct-current voltage signal, and turning off the conversion circuit when the conversion circuit generates the abnormality.