WO2020200027A1 - Driving method for power supply drive circuit, power supply drive circuit and display device - Google Patents

Driving method for power supply drive circuit, power supply drive circuit and display device Download PDF

Info

Publication number
WO2020200027A1
WO2020200027A1 PCT/CN2020/081351 CN2020081351W WO2020200027A1 WO 2020200027 A1 WO2020200027 A1 WO 2020200027A1 CN 2020081351 W CN2020081351 W CN 2020081351W WO 2020200027 A1 WO2020200027 A1 WO 2020200027A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
load
frequency
signal
power
Prior art date
Application number
PCT/CN2020/081351
Other languages
French (fr)
Chinese (zh)
Inventor
王明良
Original Assignee
惠科股份有限公司
重庆惠科金渝光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 惠科股份有限公司, 重庆惠科金渝光电科技有限公司 filed Critical 惠科股份有限公司
Publication of WO2020200027A1 publication Critical patent/WO2020200027A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation

Definitions

  • This application relates to the field of display technology, and in particular to a driving method of a power drive circuit, a power drive circuit, and a display device.
  • liquid crystal displays and other display devices have the characteristics of light and thin appearance, low power consumption and one-level non-radiation pollution. They have been widely used in portable information products such as notebook computers and personal digital assistants (PDAs).
  • PDAs personal digital assistants
  • the power drive circuit Providing power for the display panel and other devices of the display device is an indispensable part of the normal operation of the display device.
  • the purpose of this application is to provide a driving method of a power driving circuit, a power driving circuit and a display device to improve the stability of the output of the power driving circuit.
  • the present application discloses a driving method of a power supply driving circuit.
  • the driving method includes the following steps:
  • the switching frequency of the switching circuit controlling the power supply drive circuit will increase to increase the power output of the power drive circuit; when the load becomes smaller, the switching frequency of the switching circuit controlling the power drive circuit will decrease, reducing the power supply. Power output of the drive circuit.
  • the application also discloses a power supply driving circuit, which includes a power supply, a switching circuit, a charging and discharging circuit, and a switching frequency control circuit; wherein the charging and discharging circuit is connected to the power supply; the switching circuit controls The power supply circuit charges and discharges the charging and discharging circuit; the first load sampling circuit obtains the load information of the load output terminal of the power drive circuit; the switching frequency control circuit makes a judgment according to the load information obtained by the first load sampling circuit, if When the load at the output end of the load becomes larger, the switching frequency control circuit controls the switching frequency of the switching circuit to increase to increase the charging and discharging frequency of the charging and discharging circuit; if the load at the output end of the load becomes smaller, the switching frequency of the control switching circuit is reduced to reduce the The frequency of charge and discharge of the charge and discharge circuit.
  • the application also discloses a display device.
  • the display device includes a power drive circuit and a display panel powered by the power drive circuit.
  • the power drive circuit includes a power source, a switching circuit, a charging and discharging circuit, and a switching frequency control circuit.
  • the charging and discharging circuit is connected to the power supply;
  • the switch circuit controls the power supply circuit to charge and discharge the charging and discharging circuit;
  • the first load sampling circuit obtains the load information of the load output terminal of the power drive circuit;
  • the switching frequency control circuit makes a judgment based on the load information obtained by the first load sampling circuit.
  • the switching frequency control circuit controls the switching frequency of the switching circuit to increase to increase the charging and discharging frequency of the charging and discharging circuit ; If the load at the output end of the load becomes smaller, the switching frequency of the control switch circuit is reduced, and the charge and discharge frequency of the charge and discharge circuit is reduced.
  • the switching frequency of the switching circuit of the power drive circuit is increased through control, so that the response to the back-end load is faster, even if the load at the output end consumes a large current and the power changes greatly.
  • the power supply can also quickly compensate for the voltage level by recharging again, reducing the voltage ripple; when the back-end load of the power circuit becomes smaller, it is meaningless to compensate too quickly, and reduce the power supply through control
  • the switching frequency of the switching circuit of the drive circuit on the premise of meeting the requirements of the circuit for ripple (ripple), makes the voltage of the back-end load smaller, thereby reducing the power loss of the back-end load, and the electromagnetic radiation of the power drive circuit is also It will decrease as the power decreases.
  • FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a power drive circuit according to an embodiment of the present application.
  • FIG. 3 is a circuit diagram of a power driving circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of switch control signals of the power drive circuit shown in FIG. 3;
  • FIG. 5 is a schematic diagram of a power driving circuit according to another embodiment of the present application.
  • Fig. 6 is a schematic diagram of a switch control signal of the power drive circuit shown in Fig. 5;
  • FIG. 7 is a schematic diagram of the ripple voltage of an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a driving method of a power driving circuit according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a driving method of a power driving circuit according to another embodiment of the present application.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features; “plurality” means two or more.
  • the term “comprising” and any variations thereof means non-exclusive inclusion, the possibility of the presence or addition of one or more other features, integers, steps, operations, units, components, and/or combinations thereof.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection , It can also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection , It can also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components.
  • the present application discloses a display device 1 including a power drive circuit 10 and a display panel 20 powered by the power drive circuit 10.
  • FIGS 2 and 3 are the actual circuit block diagram and abstract block diagram of the power drive circuit 10, respectively.
  • the power drive circuit 10 includes: a power supply 11, a charging and discharging circuit 12, a load output terminal, and a switching circuit. 13 and a switching frequency control circuit 15; wherein, the power supply 11 is connected to the charge and discharge circuit 12; the load output terminal outputs a load voltage; the switch circuit 13 controls the power supply 11 circuit to charge and discharge the charge and discharge circuit 12
  • the first load sampling circuit 14 obtains the load information of the load output; the switching frequency control circuit 15 judges according to the load information obtained by the first load sampling circuit 14.
  • the switching frequency control circuit 15 The switching frequency of the control switch circuit 13 is increased to increase the charge and discharge frequency of the charge and discharge circuit 12; if the load at the output end of the load becomes smaller, the switch frequency of the control switch circuit 13 is reduced, and the charge and discharge frequency of the charge and discharge circuit 12 is reduced .
  • the charging and discharging circuit 12 of the power driving circuit 10 may include: an inductor L, a diode D, and a voltage stabilizing capacitor C connected to each other; the diode D is arranged between the inductor L and the voltage stabilizing capacitor C , The inductor L, the diode D, and the voltage stabilizing capacitor C are arranged between the positive and negative electrodes of the power supply 11, the switching circuit 13 is connected in parallel with the voltage stabilizing capacitor C, and the diode D is output in the forward direction of the power supply 11 One-way guide.
  • the low impedance of the parallel capacitor C short-circuits the high-impedance load to provide the required fast-changing current for the power supply 11 circuit.
  • the load maintains the current required by the steady state and slow changes, and continuously replenishes the charge to the capacitor C. Of course, this will not cause high-speed current changes in the power supply 11 devices and current distribution lines.
  • the setting of the capacitor C reduces the current change on the power supply 11, and the induced voltage of the inductance L on the distribution line of the power supply 11 is correspondingly reduced, reducing the voltage noise on the power supply 11 and achieving voltage stabilization.
  • the power supply 11 may be a DC power supply.
  • the switching frequency control circuit 15 includes a frequency adjustment circuit 151 and a switching signal generation circuit 152.
  • the frequency adjustment circuit 151 generates a frequency according to the load information obtained by the first load sampling circuit 14. The control signal, if the load becomes larger, the frequency of the generated frequency control signal becomes higher; if the load becomes smaller, the frequency of the generated frequency control signal becomes lower, and will be sent to the switch signal generating circuit 152; the switch The signal generation circuit 152 generates a switching control signal for the switching circuit 13 according to the frequency control signal generated by the frequency adjustment circuit 151, the frequency of the switching control signal is consistent with the frequency of the frequency control signal, and the switching circuit 13 according to the The switch control signal is on or off.
  • the power drive circuit 10 further includes a second load sampling circuit 16, and the second load sampling circuit 16 is connected to the switching signal generating circuit 152.
  • the second load sampling circuit 16 includes a voltage divider circuit 161 and a second comparison circuit 162, wherein the voltage divider circuit 161 is connected to the load output terminal to output a divided voltage; the second comparison circuit 162 obtains The divided voltage of the voltage dividing circuit 161 is calculated with a preset reference voltage Vref, and a load characterizing signal is output to the switching signal generating circuit 152.
  • the preset reference voltage Vref can be set according to actual needs according to the fluctuation range of the load.
  • the second comparison circuit 162 can use the comparator U1 to calculate the difference between the load signal and the reference voltage to obtain the load characterization signal.
  • those skilled in the art can also choose other acquisition methods according to their own needs.
  • the voltage divider circuit 161 can be configured as two voltage dividing resistors R1 and R2 connected in series, such as a first resistor R1 and a second resistor R2, and the divided voltage FB is collected between the voltage dividing resistors R1 and R2.
  • Output to the second comparison circuit 162 (for example, the comparator U2 is selected), so that the current obtained by the voltage division is relatively small, and the obtained voltage division voltage FB is relatively small, so that the preset reference voltage can be set to a relatively low voltage, so that To reduce the power consumption of the power drive circuit, in addition, set a relatively low voltage, the setting method is simple and easy to operate.
  • the switching signal generation circuit 152 includes an oscillation signal generation circuit and a first comparison circuit 1522.
  • the oscillation signal generation circuit generates an oscillation signal according to the frequency control signal generated by the frequency adjustment circuit 151; the first comparison circuit 1522 receives the oscillation signal and generates The oscillating signal of the circuit and the switch control signal are generated according to the load characterization signal output by the second load sampling circuit 16.
  • the second load sampling circuit 16 may not be provided, and the load information may be directly obtained in other ways.
  • the first comparison circuit 1522 is directly connected to the load output terminal of the power supply 11, and it may be directly based on the relationship between the inductor L and the diode D As the load information, even the load information can be the same as the load information voltage sampled by the first load sampling circuit 14, or in a linear proportional relationship, as long as the first load sampling circuit 14 and the second load
  • the sampling circuit 16 can reflect the voltage condition of the load output terminal of the power driving circuit 10.
  • the power drive circuit 10 described in the present application includes: a DC power supply and an inductor L, a diode D, and a stabilized capacitor C connected in series with each other, and the stabilized capacitor C is connected in parallel to the power drive circuit 10 at the load output terminal, the diode D is forwardly connected between the anode of the DC power supply 11 and the load output terminal; the inductor L, the diode D, and the capacitor C form a charging and discharging circuit; the power drive circuit 10 also includes an N-type MOS tube Q as a switching circuit and a switching frequency control circuit; the switching frequency control circuit controls the control terminal connected to the N-type MOS tube Q; the N-type MOS tube Q is connected to the power supply
  • the load output terminal of the driving circuit 10 specifically, the input terminal of the N-type MOSFET Q is coupled to the inductor L and the diode D; the output terminal is coupled to the ground terminal, and the N-type MOSFET Q In parallel with the capacitor
  • the power drive circuit 10 also includes a sampling resistor R', which is connected in series between the output terminal of the N-type MOSFET Q and the ground terminal; the switching frequency control circuit includes a voltage controlled oscillator VCO and a triangle wave oscillator OSC, and a first comparator U1.
  • the voltage-controlled oscillator VCO serves as a frequency adjustment circuit and is coupled between the sampling resistor R'and the output terminal of the N-type MOS tube Q; the triangular wave oscillator OSC Coupled between the voltage-controlled oscillator VCO and the negative input terminal of the first comparator U1; the positive input terminal of the first comparator U1 is connected to the output load characterization signal of the second load sampling circuit U2out: The output terminal of the first comparator U1 is connected to the Q control terminal of the N-type mos tube.
  • the N-type MOSFET Q is connected between the load output terminals of the power drive circuit 10
  • the voltage-controlled oscillator VCO is connected from the sampling resistors R'and N
  • the load information V' is obtained between the type MOS tube Q, and the frequency control signal is generated and sent to the triangle wave oscillator OSC.
  • the triangle wave oscillator OSC generates the triangle wave signal of the corresponding frequency; the positive input of the comparator U1 receives the output of the comparator U2
  • the load characterization signal of the negative input terminal, the triangular wave signal input by the triangular wave oscillator OSC, after the difference is compared, and the output terminal outputs a switch control signal to control the on or off of the N-type MOS tube Q.
  • the generated switch control signal is low level; if the triangle wave signal is less than the load characterization signal, the generated switch control signal is high level; the output switch control signal is It is a square wave signal.
  • the triangle wave oscillator OSC directly generates a triangle wave oscillation signal, and the positive input terminal of the comparator U1 receives the load characterization output by the comparator U2 Signal, the triangular wave signal input by the triangular wave oscillator OSC at the negative input, the comparator U1 will also generate a switch control signal, although the load on the power drive circuit becomes larger, the switch control signal generated by the comparator U1 controls the N-type mos tube Q The on-time of the switch becomes shorter and the off-time becomes longer, but the frequency period Ts of the switch control circuit is constant.
  • the frequency adjustment circuit 151 when the back-end load of the power drive circuit becomes larger, the switching frequency of the switching circuit is increased through control, so that the response to the back-end load is faster, even if The load at the output end consumes a lot of current, and the power fluctuates greatly, and the voltage level can be quickly compensated by recharging again, which reduces the voltage ripple; when the back-end load of the power drive circuit becomes small, it is too fast The compensation is not very meaningful.
  • the voltage of the back-end load is reduced, thereby making the power of the back-end load The loss is reduced, and the electromagnetic radiation of the power drive circuit will also decrease with the decrease of power.
  • FIG. 8 is a schematic diagram of a driving method of a power driving circuit of the present application.
  • the present application also discloses a driving method of the driving circuit, and the driving method includes:
  • an oscillating signal may be used to generate a switch control signal, which specifically includes:
  • B1 Obtain load information and generate an oscillation signal. If the load becomes larger, the frequency of the control oscillation signal increases; if the load becomes smaller, the frequency of the control oscillation signal becomes lower;
  • step B2 According to the oscillation signal in step B1, a switch control signal of the switch circuit is generated, the switch circuit is controlled to be turned on or off, and the power output frequency of the power drive circuit is adjusted.
  • the oscillation signal is generated. If the load becomes larger, the frequency of the control oscillation signal increases; if the load becomes smaller, the frequency of the control oscillation signal becomes lower; according to the oscillation signal, the switching control signal of the switching circuit is generated, and the switching circuit is controlled. Turn on or off, adjust the power output frequency of the power drive circuit, and when the load becomes larger or smaller, the power circuit can quickly respond to the changes in Fuxingzi, avoiding excessive ripple when the load becomes larger It happened.
  • the voltage of the back-end load is reduced, and the power loss of the back-end load is reduced, and the electromagnetic radiation of the power circuit will also be reduced as the power is reduced.
  • the step B2 also includes step M: obtaining load information, and generating a load characterization signal according to the load information; wherein, in step B2: characterizing the load according to the load characterization signal in step M and the oscillation signal in step B1 The signal is compared with the oscillating signal to generate a switch control signal of the switch circuit; the switch control signal controls the switch circuit to be turned on or off to increase the power output of the power drive circuit or reduce the power output of the power drive circuit.
  • the load characterization signal can directly reflect the change of the load size.
  • the switching control signal of the switching circuit obtained by comparing the load characterization signal and the oscillation signal can directly generate the switching control signal accurately related to the load information, as shown in Figure 4 or Figure 6.
  • the frequency of the generated switch control signal is consistent with the frequency of the oscillating signal, and the on or off time of the generated switch control signal is also related to the load information.
  • the switch control signal controls the on or off of the switch circuit, which ensures a more stable operation of the power drive circuit.
  • the oscillating signal can be a triangle wave or a sine wave, but also other waveforms.
  • the step M includes the following steps:
  • M2 Determine whether the load voltage information is greater than a preset voltage threshold, if it is greater than the preset voltage threshold, output low-level information; if it is less than the preset voltage threshold, output high-level information.
  • step M and step B1 can be executed first or later; similarly, step M can be executed first. It can also be executed later; even step M and step B1 can be executed simultaneously.
  • step B1 includes the following steps:
  • B11 Detect load information when the switch circuit is turned on in a cycle of the switch circuit
  • B12 Obtain the load characterization signal in step M, and generate frequency control signals according to different load characterization signals. If the load reflected by the load characterization signal becomes larger, a high-frequency frequency control signal is generated; if the load reflected by the load characterization signal becomes smaller , A low-frequency periodic signal is generated, and in the next cycle of the switching circuit, frequency control signals of different frequencies are sent to the oscillation signal generating circuit;
  • the oscillation signal generating circuit receives and then generates an oscillation signal with the same frequency as the frequency control signal.
  • step B2 after the switch control signal is generated, compare the if the load characterization signal with the oscillation signal: if the load characterization signal is greater than the oscillation signal, output high-level information, and control the switch circuit to turn on , To increase the power output of the power circuit to increase the power of the load circuit; if the load characteristic signal is smaller than the oscillation signal, output a low level, control the switch to open, reduce the power output of the power circuit to reduce the power of the load circuit.
  • the switch control signal is a square wave signal, the frequency of which changes with the size of the load.
  • the technical solution of this application can be widely used in various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching, in-plane switching) display panels, VA (Vertical Alignment, vertical alignment type) ) Display panels, MVA (Multi-Domain Vertical Alignment, multi-quadrant vertical alignment type) display panels, of course, can also be other types of display panels, such as OLED (Organic Light-Emitting Diode, organic light-emitting diode D) display panels, both The above scheme can be applied.
  • TN Transmission Nematic
  • IPS In-Plane Switching, in-plane switching
  • VA Very Alignment, vertical alignment type
  • MVA Multi-Domain Vertical Alignment, multi-quadrant vertical alignment type
  • OLED Organic Light-Emitting Diode, organic light-emitting diode D

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Disclosed are a driving method for a power supply drive circuit, a power supply drive circuit and a display device. The driving method comprises: obtaining load information (A); and determining the load information; when a load becomes larger, controlling the switching frequency of a switching circuit of a power supply drive circuit such that same is increased, and increasing the power supply output of the power supply drive circuit; and when the load becomes smaller, controlling the switching frequency of the switching circuit of the power supply drive circuit such that same is reduced, and reducing the power supply output of the power supply drive circuit (B).

Description

电源驱动电路的驱动方法、电源驱动电路和显示装置Power drive circuit driving method, power drive circuit and display device
本申请要求于2019年4月4日提交中国专利局，申请号为CN201910271004.6，申请名称为“一种电源驱动模组的驱动方法、电源驱动模组和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application requires that it be submitted to the Chinese Patent Office on April 4, 2019. The application number is CN201910271004.6, and the application name is "a method for driving a power drive module, a power drive module and a display device". Right, the entire contents of which are incorporated in this application by reference.
技术领域Technical field
本申请涉及显示技术领域，尤其涉及一种电源驱动电路的驱动方法、电源驱动电路和显示装置。This application relates to the field of display technology, and in particular to a driving method of a power drive circuit, a power drive circuit, and a display device.
背景技术Background technique
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。The statements here only provide background information related to this application, and do not necessarily constitute prior art.
近年来液晶显示器等显示装置具有外型轻薄、耗电量少一级无辐射污染等特点，已被广泛地应用在笔记本电脑、个人数字助理(PDA)等便携式信息产品上，其中，电源驱动电路为显示装置的显示面板等器件提供电源，是显示装置正常工作不可或缺的重要一环。In recent years, liquid crystal displays and other display devices have the characteristics of light and thin appearance, low power consumption and one-level non-radiation pollution. They have been widely used in portable information products such as notebook computers and personal digital assistants (PDAs). Among them, the power drive circuit Providing power for the display panel and other devices of the display device is an indispensable part of the normal operation of the display device.
电源驱动电路的负载的功耗越大，电源驱动电路的电源输出就越不稳定，纹波(ripple)就越大，这样对电源电路的使用，甚至包括后端的显示都会带来不良影响，亟待解决。The greater the power consumption of the load of the power drive circuit, the more unstable the power output of the power drive circuit and the larger the ripple. This will have adverse effects on the use of the power circuit and even the display on the back end. solve.
发明内容Summary of the invention
本申请的目的是提供一种电源驱动电路的驱动方法、电源驱动电路和显示装置，以提高电源驱动电路输出的稳定性。The purpose of this application is to provide a driving method of a power driving circuit, a power driving circuit and a display device to improve the stability of the output of the power driving circuit.
本申请公开了一种电源驱动电路的驱动方法，所述驱动方法包括以下步骤：The present application discloses a driving method of a power supply driving circuit. The driving method includes the following steps:
获得负载信息；以及Get load information; and
对负载信息进行判断，若负载变大时，控制电源驱动电路的开关电路的开关频率提高，提高电源驱动电路的电源输出；负载变小时，控制电源驱动电路的开关电路的开关频率降低，降低电源驱动电路的电源输出。Judge the load information. If the load becomes larger, the switching frequency of the switching circuit controlling the power supply drive circuit will increase to increase the power output of the power drive circuit; when the load becomes smaller, the switching frequency of the switching circuit controlling the power drive circuit will decrease, reducing the power supply. Power output of the drive circuit.
本申请还公开了一种电源驱动电路，所述电源驱动电路包括电源、开关电路、充放电电路、开关频率控制电路；其中，所述充放电电路与所述电源连接的；所述开关电路控制电源电路对充放电电路进行充放电；所述第一负载采样电路获取所述电源驱动电路的负载输出端的负载信息；所述开关频率控制电路根据第一负载采样电路得到的负载信息进行判断，若负载输出端的负载变大时，开关频率控制电路控制开关电路的开关频率提高，提高所述充放电 电路的充放电频率；若负载输出端的负载变小时，控制开关电路的开关频率减低，降低所述充放电电路的充放电频率。The application also discloses a power supply driving circuit, which includes a power supply, a switching circuit, a charging and discharging circuit, and a switching frequency control circuit; wherein the charging and discharging circuit is connected to the power supply; the switching circuit controls The power supply circuit charges and discharges the charging and discharging circuit; the first load sampling circuit obtains the load information of the load output terminal of the power drive circuit; the switching frequency control circuit makes a judgment according to the load information obtained by the first load sampling circuit, if When the load at the output end of the load becomes larger, the switching frequency control circuit controls the switching frequency of the switching circuit to increase to increase the charging and discharging frequency of the charging and discharging circuit; if the load at the output end of the load becomes smaller, the switching frequency of the control switching circuit is reduced to reduce the The frequency of charge and discharge of the charge and discharge circuit.
本申请还公开了一种显示装置，所述显示装置包括电源驱动电路，以及由所述电源驱动电路供电的显示面板，所述电源驱动电路包括电源、开关电路、充放电电路、开关频率控制电路；其中，所述充放电电路与所述电源连接的；所述开关电路控制电源电路对充放电电路进行充放电；所述第一负载采样电路获取所述电源驱动电路的负载输出端的负载信息；所述开关频率控制电路根据第一负载采样电路得到的负载信息进行判断，若负载输出端的负载变大时，开关频率控制电路控制开关电路的开关频率提高，提高所述充放电电路的充放电频率；若负载输出端的负载变小时，控制开关电路的开关频率减低，降低所述充放电电路的充放电频率。The application also discloses a display device. The display device includes a power drive circuit and a display panel powered by the power drive circuit. The power drive circuit includes a power source, a switching circuit, a charging and discharging circuit, and a switching frequency control circuit. Wherein the charging and discharging circuit is connected to the power supply; the switch circuit controls the power supply circuit to charge and discharge the charging and discharging circuit; the first load sampling circuit obtains the load information of the load output terminal of the power drive circuit; The switching frequency control circuit makes a judgment based on the load information obtained by the first load sampling circuit. If the load at the output end of the load becomes larger, the switching frequency control circuit controls the switching frequency of the switching circuit to increase to increase the charging and discharging frequency of the charging and discharging circuit ; If the load at the output end of the load becomes smaller, the switching frequency of the control switch circuit is reduced, and the charge and discharge frequency of the charge and discharge circuit is reduced.
当电源驱动电路的后端负载变大时，通过控制提高电源驱动电路的开关电路的开关频率，使得对后端负载的响应更快，即便输出端的负载消耗的电流很大，功率变化波动大，电源也可以很快通过再次充电将电压准位补偿回来，降低了电压的纹波(ripple)；当电源电路的后端负载变小时，过于迅速的补偿显得就没有太大意义，通过控制降低电源驱动电路的开关电路的开关频率，在满足电路对纹波(ripple)要求的前提下，使得后端负载的电压变小，进而使得后端负载的功率损耗降低，而电源驱动电路的电磁辐射也会随着功率的降低而降低。When the back-end load of the power drive circuit becomes larger, the switching frequency of the switching circuit of the power drive circuit is increased through control, so that the response to the back-end load is faster, even if the load at the output end consumes a large current and the power changes greatly, The power supply can also quickly compensate for the voltage level by recharging again, reducing the voltage ripple; when the back-end load of the power circuit becomes smaller, it is meaningless to compensate too quickly, and reduce the power supply through control The switching frequency of the switching circuit of the drive circuit, on the premise of meeting the requirements of the circuit for ripple (ripple), makes the voltage of the back-end load smaller, thereby reducing the power loss of the back-end load, and the electromagnetic radiation of the power drive circuit is also It will decrease as the power decreases.
附图说明Description of the drawings
所包括的附图用来提供对本申请实施例的进一步的理解，其构成了说明书的一部分，用于例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the embodiments of the present application, and together with the text description, explain the principle of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor. In the attached picture:
图1是本申请的一实施例的一种显示装置的示意图；FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application;
图2是本申请的一实施例的一种电源驱动电路的示意图；2 is a schematic diagram of a power drive circuit according to an embodiment of the present application;
图3是本申请的一实施例的一种电源驱动电路的电路图；FIG. 3 is a circuit diagram of a power driving circuit according to an embodiment of the present application;
图4是图3所示的电源驱动电路的开关控制信号示意图；FIG. 4 is a schematic diagram of switch control signals of the power drive circuit shown in FIG. 3;
图5是本申请的另一实施例的一种电源驱动电路的示意图；FIG. 5 is a schematic diagram of a power driving circuit according to another embodiment of the present application;
图6是图5所示的电源驱动电路的开关控制信号示意图；Fig. 6 is a schematic diagram of a switch control signal of the power drive circuit shown in Fig. 5;
图7是本申请一实施例的纹波电压示意图；FIG. 7 is a schematic diagram of the ripple voltage of an embodiment of the present application;
图8是本申请的一实施例的电源驱动电路的驱动方法的示意图；FIG. 8 is a schematic diagram of a driving method of a power driving circuit according to an embodiment of the present application;
图9是本申请另一实施例的电源驱动电路的驱动方法示意图。FIG. 9 is a schematic diagram of a driving method of a power driving circuit according to another embodiment of the present application.
具体实施方式detailed description
需要理解的是，这里所使用的术语、公开的具体结构和功能细节，仅仅是为了描述具体实施例，是代表性的，但是本申请可以通过许多替换形式来具体实现，不应被解释成仅受限于这里所阐述的实施例。It should be understood that the terms used here, the specific structure and function details disclosed are only for describing specific embodiments and are representative. However, this application can be implemented in many alternative forms and should not be interpreted as merely It is limited to the embodiments described here.
在本申请的描述中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示相对重要性，或者隐含指明所指示的技术特征的数量。由此，除非另有说明，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征；“多个”的含义是两个或两个以上。术语“包括”及其任何变形，意为不排他的包含，可能存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。In the description of this application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features; "plurality" means two or more. The term "comprising" and any variations thereof means non-exclusive inclusion, the possibility of the presence or addition of one or more other features, integers, steps, operations, units, components, and/or combinations thereof.
另外，“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系的术语，是基于附图所示的方位或相对位置关系描述的，仅是为了便于描述本申请的简化描述，而不是指示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。In addition, "center", "horizontal", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" The terms indicating the orientation or positional relationship are described based on the orientation or relative positional relationship shown in the drawings, and are only used to facilitate the simplified description of the application, rather than indicating that the pointed device or element must have a specific orientation , It is constructed and operated in a specific orientation, so it cannot be understood as a limitation of this application.
此外，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，或是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。In addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection , It can also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
下面参考附图和可选的实施例对本申请作详细说明。The application will be described in detail below with reference to the drawings and optional embodiments.
如图1所示，本申请公开了一种显示装置1，包括电源驱动电路10，以及由所述电源驱动电路10供电的显示面板20。As shown in FIG. 1, the present application discloses a display device 1 including a power drive circuit 10 and a display panel 20 powered by the power drive circuit 10.
如图2和图3所示，图2和图3分别是电源驱动电路10的实际电路框图和抽象框图，所述电源驱动电路10包括：电源11、充放电电路12、负载输出端、开关电路13以及开关频率控制电路15；其中，所述电源11与所述充放电电路12连接；所述负载输出端输出一负载电压；所述开关电路13控制电源11电路对充放电电路12进行充放电；所述第一负载采样电路14获取负载输出端的负载信息；所述开关频率控制电路15根据第一负载采样电路14得到的负载信息进行判断，若负载输出端的负载变大时，开关频率控制电路15控制开关电路13的开关频率提高，提高所述充放电电路12的充放电频率；若负载输出端的负载变小时，控制开关电路13的开关频率减低，降低所述充放电电路12的充放电频率。As shown in Figures 2 and 3, Figures 2 and 3 are the actual circuit block diagram and abstract block diagram of the power drive circuit 10, respectively. The power drive circuit 10 includes: a power supply 11, a charging and discharging circuit 12, a load output terminal, and a switching circuit. 13 and a switching frequency control circuit 15; wherein, the power supply 11 is connected to the charge and discharge circuit 12; the load output terminal outputs a load voltage; the switch circuit 13 controls the power supply 11 circuit to charge and discharge the charge and discharge circuit 12 The first load sampling circuit 14 obtains the load information of the load output; the switching frequency control circuit 15 judges according to the load information obtained by the first load sampling circuit 14. If the load of the load output becomes larger, the switching frequency control circuit 15 The switching frequency of the control switch circuit 13 is increased to increase the charge and discharge frequency of the charge and discharge circuit 12; if the load at the output end of the load becomes smaller, the switch frequency of the control switch circuit 13 is reduced, and the charge and discharge frequency of the charge and discharge circuit 12 is reduced .
具体的，所述电源驱动电路10的充放电电路12可包括：相互连接的电感L、二极管D，稳压电容C；所述二极管D设置在所述电感L与所述稳压电容C之间，所述电感L、二极管D，稳压电容C设置在所述电源11的正负极之间，所述开关电路13与所述稳压电容C 并联，所述二极管D在电源11正向输出方向单向导通。在电源11电路电流切换时，并联的电容C的低阻抗短接了高阻抗的负载，为电源11电路提供所需要的快速变化的电流。负载维持着稳定状态和慢速变化所需要的电流，并不断向电容C补充电荷。当然，这不会引起电源11设备和电流分布线上高速的电流变化。电容C的设置减少了供电电源11上的电流变化，电源11分布线上电感L的感应电压相应就减少了，减少了电源11上的电压噪声，实现稳压。Specifically, the charging and discharging circuit 12 of the power driving circuit 10 may include: an inductor L, a diode D, and a voltage stabilizing capacitor C connected to each other; the diode D is arranged between the inductor L and the voltage stabilizing capacitor C , The inductor L, the diode D, and the voltage stabilizing capacitor C are arranged between the positive and negative electrodes of the power supply 11, the switching circuit 13 is connected in parallel with the voltage stabilizing capacitor C, and the diode D is output in the forward direction of the power supply 11 One-way guide. When the circuit current of the power supply 11 is switched, the low impedance of the parallel capacitor C short-circuits the high-impedance load to provide the required fast-changing current for the power supply 11 circuit. The load maintains the current required by the steady state and slow changes, and continuously replenishes the charge to the capacitor C. Of course, this will not cause high-speed current changes in the power supply 11 devices and current distribution lines. The setting of the capacitor C reduces the current change on the power supply 11, and the induced voltage of the inductance L on the distribution line of the power supply 11 is correspondingly reduced, reducing the voltage noise on the power supply 11 and achieving voltage stabilization.
所述电源11可为直流电源，所述开关频率控制电路15包括频率调整电路151和开关信号生成电路152，其中，所述频率调整电路151根据根据第一负载采样电路14得到的负载信息产生频率控制信号，若负载变大，则产生的频率控制信号的频率的变高；若负载变小，则产生的频率控制信号的频率的变低，并将发送给开关信号生成电路152；所述开关信号生成电路152根据频率调整电路151生成的频率控制信号，生成生成开关电路13的开关控制信号，所述开关控制信号的频率与所述频率控制信号的频率一致，所述开关电路13根据所述开关控制信号导通或断开。The power supply 11 may be a DC power supply. The switching frequency control circuit 15 includes a frequency adjustment circuit 151 and a switching signal generation circuit 152. The frequency adjustment circuit 151 generates a frequency according to the load information obtained by the first load sampling circuit 14. The control signal, if the load becomes larger, the frequency of the generated frequency control signal becomes higher; if the load becomes smaller, the frequency of the generated frequency control signal becomes lower, and will be sent to the switch signal generating circuit 152; the switch The signal generation circuit 152 generates a switching control signal for the switching circuit 13 according to the frequency control signal generated by the frequency adjustment circuit 151, the frequency of the switching control signal is consistent with the frequency of the frequency control signal, and the switching circuit 13 according to the The switch control signal is on or off.
所述电源驱动电路10还包括第二负载采样电路16，所述第二负载采样电路16与所述开关信号生成电路152连接。所述第二负载采样电路16包括分压电路161和第二比较电路162，其中，所述分压电路161连接与所述负载输出端，输出一分压电压；所述第二比较电路162获得分压电路161的分压电压并与一预设的参考电压Vref进行计算，输出负载表征信号给所述开关信号生成电路152。预设的参考电压Vref可以根据负载的波动范围根据实际需要进行设置。所述第二比较电路162可以使用比较器U1对负载信号和基准电压求差来实现获得负载表征信号，当然本领域技术人员也可以根据自身的需求来，选择其他获取方式。The power drive circuit 10 further includes a second load sampling circuit 16, and the second load sampling circuit 16 is connected to the switching signal generating circuit 152. The second load sampling circuit 16 includes a voltage divider circuit 161 and a second comparison circuit 162, wherein the voltage divider circuit 161 is connected to the load output terminal to output a divided voltage; the second comparison circuit 162 obtains The divided voltage of the voltage dividing circuit 161 is calculated with a preset reference voltage Vref, and a load characterizing signal is output to the switching signal generating circuit 152. The preset reference voltage Vref can be set according to actual needs according to the fluctuation range of the load. The second comparison circuit 162 can use the comparator U1 to calculate the difference between the load signal and the reference voltage to obtain the load characterization signal. Of course, those skilled in the art can also choose other acquisition methods according to their own needs.
分压电路161可以设置为串联的两个分压电阻R1和R2，,如第一电阻R1和第二电阻R2，在分压电阻R1和R2之间采集到分压电压FB，分压电压FB输出到第二比较电路162(如选用比较器U2)，这样分压得到的电流比较小，获取的分压电压FB比较小，这样预设的参考电压就可以设置的比较低的电压，这样起到了减低电源驱动电路功耗的作用，另外，设置一个比较低的电压，设置方法简单易行操作性强。The voltage divider circuit 161 can be configured as two voltage dividing resistors R1 and R2 connected in series, such as a first resistor R1 and a second resistor R2, and the divided voltage FB is collected between the voltage dividing resistors R1 and R2. Output to the second comparison circuit 162 (for example, the comparator U2 is selected), so that the current obtained by the voltage division is relatively small, and the obtained voltage division voltage FB is relatively small, so that the preset reference voltage can be set to a relatively low voltage, so that To reduce the power consumption of the power drive circuit, in addition, set a relatively low voltage, the setting method is simple and easy to operate.
所述开关信号生成电路152包括振荡信号生成电路和第一比较电路1522，所述振荡信号生成电路根据频率调整电路151生成的频率控制信号产生振荡信号；所述第一比较电路1522接收振荡信号生成电路的振荡信号，并根据所述第二负载采样电路16输出的负载表征信号生成开关控制信号。当然，也可以不设置第二负载采样电路16，可以通过其他方式直接获取负载信息，例如所述第一比较电路1522直接连接于电源11的负载输出端，可以直接依据电感L与二极管D之间的电压作为负载信息，甚至该负载信息可以与上述的第一负载采样电路14所采样的负载信息电压一样，或呈一线性比例关系都可以，只要所述第一负载采样电路14和第二负载采样电路16能反映所述电源驱动电路10的负载输出端的电压情况 即可。The switching signal generation circuit 152 includes an oscillation signal generation circuit and a first comparison circuit 1522. The oscillation signal generation circuit generates an oscillation signal according to the frequency control signal generated by the frequency adjustment circuit 151; the first comparison circuit 1522 receives the oscillation signal and generates The oscillating signal of the circuit and the switch control signal are generated according to the load characterization signal output by the second load sampling circuit 16. Of course, the second load sampling circuit 16 may not be provided, and the load information may be directly obtained in other ways. For example, the first comparison circuit 1522 is directly connected to the load output terminal of the power supply 11, and it may be directly based on the relationship between the inductor L and the diode D As the load information, even the load information can be the same as the load information voltage sampled by the first load sampling circuit 14, or in a linear proportional relationship, as long as the first load sampling circuit 14 and the second load The sampling circuit 16 can reflect the voltage condition of the load output terminal of the power driving circuit 10.
具体的，参考图4和5，本申请所述的电源驱动电路10包括：直流电源以及相互串联的电感L、二极管D和稳压电容C，所述稳压电容C并联在所述电源驱动电路10的负载输出端，所述二极管D正向连接在所述直流电源11的正极与负载输出端之间；所述电感L、二极管D以及电容C组成了一充放电电路；所述电源驱动电路10还包括一N型mos管Q作为开关电路以及一开关频率控制电路；所述开关频率控制电路控制连接所述N型mos管Q的控制端；所述N型mos管Q连接在所述电源驱动电路10的负载输出端，具体的，所述的N型mos管Q的输入端耦接与所述电感L与二极管D之间；输出端耦接到接地端，所述N型mos管Q与所述电容C并联，通过控制N型mos管Q的导通与关断，可以控制所述充放电电路12的充放电，控制所述电源驱动电路10的输出。Specifically, referring to FIGS. 4 and 5, the power drive circuit 10 described in the present application includes: a DC power supply and an inductor L, a diode D, and a stabilized capacitor C connected in series with each other, and the stabilized capacitor C is connected in parallel to the power drive circuit 10 at the load output terminal, the diode D is forwardly connected between the anode of the DC power supply 11 and the load output terminal; the inductor L, the diode D, and the capacitor C form a charging and discharging circuit; the power drive circuit 10 also includes an N-type MOS tube Q as a switching circuit and a switching frequency control circuit; the switching frequency control circuit controls the control terminal connected to the N-type MOS tube Q; the N-type MOS tube Q is connected to the power supply The load output terminal of the driving circuit 10, specifically, the input terminal of the N-type MOSFET Q is coupled to the inductor L and the diode D; the output terminal is coupled to the ground terminal, and the N-type MOSFET Q In parallel with the capacitor C, by controlling the on and off of the N-type MOSFET Q, the charging and discharging of the charging and discharging circuit 12 can be controlled, and the output of the power driving circuit 10 can be controlled.
所述电源驱动电路10还包括一第二负载采样电路，具体的，包括：电阻R1与电阻R2，及一第二比较器U2；所述电阻R1与电阻R2串联于负载输出端与接地端之间，电阻R1与电阻R2组成了一分压电路，所述分压电路通过对负载输出点分压得到分压电压FB；所述分压电压输出到所述比较器U2的负输入端，所述比较器U2的正输入端输入一基准电压Vref，所述分压电压FB与所述基准电压Vref在经过比较器U2比较后，比较器U2输出负载表征信号U2 OUT＝Vref-FB。 The power drive circuit 10 also includes a second load sampling circuit, specifically, including: a resistor R1 and a resistor R2, and a second comparator U2; the resistor R1 and the resistor R2 are connected in series between the load output terminal and the ground terminal In between, the resistor R1 and the resistor R2 form a voltage divider circuit, which obtains the divided voltage FB by dividing the load output point; the divided voltage is output to the negative input terminal of the comparator U2, so The positive input terminal of the comparator U2 inputs a reference voltage Vref. After the divided voltage FB and the reference voltage Vref are compared by the comparator U2, the comparator U2 outputs a load characterizing signal U2 OUT =Vref-FB.
所述电源驱动电路10还包括一采样电阻R’，采样电阻R’串联于N型mos管Q的输出端与接地端之间；所述开关频率控制电路包括压控振荡器VCO、三角波振荡器OSC，以及第一比较器U1，所述压控振荡器VCO作为频率调整电路，耦接于所述采样电阻R’与所述N型mos管Q的输出端之间；所述三角波振荡器OSC耦接于所述压控振荡器VCO与所述第一比较器U1的负输入端之间；所述第一比较器U1的正输入端接入所述第二负载采样电路的输出负载表征信号U2out；所述第一比较器U1的输出端控制连接到所述N型mos管Q控制端。The power drive circuit 10 also includes a sampling resistor R', which is connected in series between the output terminal of the N-type MOSFET Q and the ground terminal; the switching frequency control circuit includes a voltage controlled oscillator VCO and a triangle wave oscillator OSC, and a first comparator U1. The voltage-controlled oscillator VCO serves as a frequency adjustment circuit and is coupled between the sampling resistor R'and the output terminal of the N-type MOS tube Q; the triangular wave oscillator OSC Coupled between the voltage-controlled oscillator VCO and the negative input terminal of the first comparator U1; the positive input terminal of the first comparator U1 is connected to the output load characterization signal of the second load sampling circuit U2out: The output terminal of the first comparator U1 is connected to the Q control terminal of the N-type mos tube.
结合图4，由于N型mos管Q接入在所述电源驱动电路10的负载输出端之间，当N型mos管Q导通时，所述压控振荡器VCO从采样电阻R’和N型mos管Q之间获得负载信息V’，生成频率控制信号发送给三角波振荡器OSC，所述三角波振荡器OSC产生对应频率的三角波信号；所述比较器U1的正输入端接收比较器U2输出的负载表征信号，负输入端三角波振荡器OSC输入的三角波信号，进行求差比较后，输出端输出开关控制信号控制N型mos管Q的导通或关闭。其中，若三角波信号大于所述负载表征信号，则生成的开关控制信号为低电平；若三角波信号小于所述负载表征信号，则生成的开关控制信号为高电平；其输出的开关控制信号为一方波信号。With reference to FIG. 4, since the N-type MOSFET Q is connected between the load output terminals of the power drive circuit 10, when the N-type MOSFET Q is turned on, the voltage-controlled oscillator VCO is connected from the sampling resistors R'and N The load information V'is obtained between the type MOS tube Q, and the frequency control signal is generated and sent to the triangle wave oscillator OSC. The triangle wave oscillator OSC generates the triangle wave signal of the corresponding frequency; the positive input of the comparator U1 receives the output of the comparator U2 The load characterization signal of the negative input terminal, the triangular wave signal input by the triangular wave oscillator OSC, after the difference is compared, and the output terminal outputs a switch control signal to control the on or off of the N-type MOS tube Q. Wherein, if the triangle wave signal is greater than the load characterization signal, the generated switch control signal is low level; if the triangle wave signal is less than the load characterization signal, the generated switch control signal is high level; the output switch control signal is It is a square wave signal.
若不设置所述的频率调整电路151，如图5所示，结合图6，所述三角波振荡器OSC直 接生成三角波振荡信号，所述比较器U1的正输入端接收比较器U2输出的负载表征信号，负输入端三角波振荡器OSC输入的三角波信号，比较器U1也会生成开关控制信号，虽然对着电源驱动电路的负载变大，比较器U1所产生的开关控制信号控制N型mos管Q的导通时间变短，断开的时间变长，但开关控制电路的频率周期Ts是一定的。If the frequency adjustment circuit 151 is not provided, as shown in FIG. 5 and in conjunction with FIG. 6, the triangle wave oscillator OSC directly generates a triangle wave oscillation signal, and the positive input terminal of the comparator U1 receives the load characterization output by the comparator U2 Signal, the triangular wave signal input by the triangular wave oscillator OSC at the negative input, the comparator U1 will also generate a switch control signal, although the load on the power drive circuit becomes larger, the switch control signal generated by the comparator U1 controls the N-type mos tube Q The on-time of the switch becomes shorter and the off-time becomes longer, but the frequency period Ts of the switch control circuit is constant.
对应的，在设置了频率调整电路151后，如图7所示，当电源驱动电路的后端负载变大时，通过控制提高开关电路的开关频率，使得对后端负载的响应更快，即便输出端的负载消耗的电流很大，功率变化波动大，也可以很快通过再次充电将电压准位补偿回来，降低了电压的纹波(ripple)；当电源驱动电路后端负载变小时，过于迅速的补偿显得就没有太大意义，通过控制降低开关电路的开关频率，在满足电源驱动电路对纹波(ripple)要求的前提下，使得后端负载的电压变小，进而使得后端负载的功率损耗降低，而电源驱动电路的电磁辐射也会随着功率的降低而降低。Correspondingly, after the frequency adjustment circuit 151 is provided, as shown in FIG. 7, when the back-end load of the power drive circuit becomes larger, the switching frequency of the switching circuit is increased through control, so that the response to the back-end load is faster, even if The load at the output end consumes a lot of current, and the power fluctuates greatly, and the voltage level can be quickly compensated by recharging again, which reduces the voltage ripple; when the back-end load of the power drive circuit becomes small, it is too fast The compensation is not very meaningful. By controlling to reduce the switching frequency of the switching circuit, under the premise of meeting the ripple requirements of the power drive circuit, the voltage of the back-end load is reduced, thereby making the power of the back-end load The loss is reduced, and the electromagnetic radiation of the power drive circuit will also decrease with the decrease of power.
对应的，如图8所示，图8是本申请一种电源驱动电路的驱动方法的示意图，本申请还公开了一种驱动电路的驱动方法，所述驱动方法包括：Correspondingly, as shown in FIG. 8, FIG. 8 is a schematic diagram of a driving method of a power driving circuit of the present application. The present application also discloses a driving method of the driving circuit, and the driving method includes:
A：获得负载信息；A: Obtain load information;
B：对负载信息进行判断，若负载变大时，控制开关电路的开关频率提高，提高电源驱动电路的输出；负载变小时，控制开关电路的开关频率降低，降低电源驱动电路的输出。B: Judge the load information. If the load becomes larger, the switching frequency of the control switch circuit will increase to increase the output of the power drive circuit; if the load becomes smaller, the switching frequency of the control switch circuit will decrease, reducing the output of the power drive circuit.
参考图9，所述步骤B中可以通过振荡信号来生成开关控制信号，具体包括：Referring to FIG. 9, in the step B, an oscillating signal may be used to generate a switch control signal, which specifically includes:
B1：获取负载信息，生成振荡信号，若负载变大，控制振荡信号的频率提高；若负载变小，控制振荡信号的频率变低；B1: Obtain load information and generate an oscillation signal. If the load becomes larger, the frequency of the control oscillation signal increases; if the load becomes smaller, the frequency of the control oscillation signal becomes lower;
B2：根据步骤B1中的振荡信号，生成开关电路的开关控制信号，控制开关电路导通或断开，调整电源驱动电路的电源输出频率。B2: According to the oscillation signal in step B1, a switch control signal of the switch circuit is generated, the switch circuit is controlled to be turned on or off, and the power output frequency of the power drive circuit is adjusted.
通过获取负载信息，生成振荡信号，若负载变大，控制振荡信号的频率提高；若负载变小，控制振荡信号的频率变低；根据振荡信号，生成开关电路的开关控制信号，控制开关电路导通或断开，调整电源驱动电路的电源输出频率，对负载变大或变小的情况，电源电路可以快速对福星仔的变化做出响应，避免了当负载变大时而造成纹波过大的情况发生。使得后端负载的电压变小，进而使得后端负载的功率损耗降低，而电源电路的电磁辐射也会随着功率的降低而降低。By obtaining the load information, the oscillation signal is generated. If the load becomes larger, the frequency of the control oscillation signal increases; if the load becomes smaller, the frequency of the control oscillation signal becomes lower; according to the oscillation signal, the switching control signal of the switching circuit is generated, and the switching circuit is controlled. Turn on or off, adjust the power output frequency of the power drive circuit, and when the load becomes larger or smaller, the power circuit can quickly respond to the changes in Fuxingzi, avoiding excessive ripple when the load becomes larger It happened. The voltage of the back-end load is reduced, and the power loss of the back-end load is reduced, and the electromagnetic radiation of the power circuit will also be reduced as the power is reduced.
所述步骤B2之前还包括步骤M：获得负载信息，根据负载信息生成负载表征信号；其中，在B2步骤中：根据步骤M中的负载表征信号与步骤B1中的振荡信号，对所述负载表征信号与所述振荡信号进行比较，生成开关电路的开关控制信号；所述开关控制信号控制开关电路导通或断开，以提高电源驱动电路的电源输出或降低电源驱动电路的电源输出。负载表征信号直接能反应负载大小变化情况，以负载表征信号及振荡信号进行比较得到的开关电 路的开关控制信号，可以直接生成与负载信息准确相关的开关控制信号，如图4或图6所示，生成的开关控制信号的频率与振荡信号的频率一致，生成的开关控制信号的打开或关断时间也与负载信息相关。开关控制信号控制开关电路的导通或者关闭，保证了电源驱动电路更稳定的工作。振荡信号可以是三角波或者正弦波，当也可以是其他波形。The step B2 also includes step M: obtaining load information, and generating a load characterization signal according to the load information; wherein, in step B2: characterizing the load according to the load characterization signal in step M and the oscillation signal in step B1 The signal is compared with the oscillating signal to generate a switch control signal of the switch circuit; the switch control signal controls the switch circuit to be turned on or off to increase the power output of the power drive circuit or reduce the power output of the power drive circuit. The load characterization signal can directly reflect the change of the load size. The switching control signal of the switching circuit obtained by comparing the load characterization signal and the oscillation signal can directly generate the switching control signal accurately related to the load information, as shown in Figure 4 or Figure 6. , The frequency of the generated switch control signal is consistent with the frequency of the oscillating signal, and the on or off time of the generated switch control signal is also related to the load information. The switch control signal controls the on or off of the switch circuit, which ensures a more stable operation of the power drive circuit. The oscillating signal can be a triangle wave or a sine wave, but also other waveforms.
具体的，所述步骤M包括以下步骤：Specifically, the step M includes the following steps:
M1：获取负载电压信息；M1: Obtain load voltage information;
M2：判断负载电压信息是否大于一预设电压阈值，若大于预设电压阈值，输出低电平信息；若小于预设电压阈值，则输出高电平信息。M2: Determine whether the load voltage information is greater than a preset voltage threshold, if it is greater than the preset voltage threshold, output low-level information; if it is less than the preset voltage threshold, output high-level information.
需要说明的是，所述步骤M与步骤B1并不存在一固定的执行顺序，步骤B1可以是在先执行的，也可以是在后执行的；同理，步骤M可以是在先执行的，也可以是在后执行的；甚至步骤M与步骤B1也可以是同时执行的。It should be noted that there is no fixed execution order for step M and step B1. Step B1 can be executed first or later; similarly, step M can be executed first. It can also be executed later; even step M and step B1 can be executed simultaneously.
具体的，所述步骤B1包括以下步骤：Specifically, the step B1 includes the following steps:
B11：在一个开关电路的周期内，在开关电路开启时侦测负载信息；B11: Detect load information when the switch circuit is turned on in a cycle of the switch circuit;
B12：获取步骤M中的负载表征信号，根据不同的负载表征信号产生频率控制信号，若负载表征信号体现的负载变大，则产生高频率的频率控制信号；若负载表征信号体现的负载变小，则产生低频率的周期信号，在下一个开关电路的周期时，将不同频率的频率控制信号，发送给振荡信号生成电路；B12: Obtain the load characterization signal in step M, and generate frequency control signals according to different load characterization signals. If the load reflected by the load characterization signal becomes larger, a high-frequency frequency control signal is generated; if the load reflected by the load characterization signal becomes smaller , A low-frequency periodic signal is generated, and in the next cycle of the switching circuit, frequency control signals of different frequencies are sent to the oscillation signal generating circuit;
B13：振荡信号生成电路接受然后产生与频率控制信号相同频率的振荡信号。B13: The oscillation signal generating circuit receives and then generates an oscillation signal with the same frequency as the frequency control signal.
对应的，所述步骤B2中，生成的开关控制信号后，对若负载表征信号和所述振荡信号进行比较：若负载表征信号大于所述振荡信号，输出高电平信息，控制开关电路导通，以提高电源电路的电源输出，以提高负载电路的功率；若负载表征信号小于所述振荡信号，输出低电平，控制开关断开，降低电源电路的电源输出，以降低负载电路的功率。对应的，所述的开关控制信号为一方波信号，其频率随着负载大小的变化而变化。Correspondingly, in the step B2, after the switch control signal is generated, compare the if the load characterization signal with the oscillation signal: if the load characterization signal is greater than the oscillation signal, output high-level information, and control the switch circuit to turn on , To increase the power output of the power circuit to increase the power of the load circuit; if the load characteristic signal is smaller than the oscillation signal, output a low level, control the switch to open, reduce the power output of the power circuit to reduce the power of the load circuit. Correspondingly, the switch control signal is a square wave signal, the frequency of which changes with the size of the load.
需要说明的是，本方案中涉及到的各步骤的限定，在不影响具体方案实施的前提下，并不认定为对步骤先后顺序做出限定，写在前面的步骤可以是在先执行的，也可以是在后执行的，甚至也可以是同时执行的，只要能实施本方案，都应当视为属于本申请的保护范围。It should be noted that the limitation of each step involved in this plan is not deemed to be a limitation on the order of the steps without affecting the implementation of the specific plan. The steps written in the front can be executed first. It can also be executed later, or even simultaneously. As long as the solution can be implemented, it should be regarded as belonging to the protection scope of this application.
本申请的技术方案可以广泛用于各种显示面板，如TN(Twisted Nematic，扭曲向列型)显示面板、IPS(In-Plane Switching，平面转换型)显示面板、VA(Vertical Alignment，垂直配向型)显示面板、MVA(Multi-Domain Vertical Alignment，多象限垂直配向型)显示面板，当然，也可以是其他类型的显示面板，如OLED(Organic Light-Emitting Diode，有机发光二极管D)显示面板，均可适用上述方案。The technical solution of this application can be widely used in various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching, in-plane switching) display panels, VA (Vertical Alignment, vertical alignment type) ) Display panels, MVA (Multi-Domain Vertical Alignment, multi-quadrant vertical alignment type) display panels, of course, can also be other types of display panels, such as OLED (Organic Light-Emitting Diode, organic light-emitting diode D) display panels, both The above scheme can be applied.
以上内容是结合具体的可选实施方式对本申请所作的进一步详细说明，不能认定本申请 的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。The above content is a further detailed description of the application in conjunction with specific optional implementations, and it cannot be considered that the specific implementation of the application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, a number of simple deductions or substitutions can be made without departing from the concept of this application, which should be regarded as falling within the protection scope of this application.

Claims (17)

  1. 一种电源驱动电路的驱动方法，所述驱动方法包括：A driving method of a power supply driving circuit, the driving method includes:
    获得负载信息；Obtain load information;
    对负载信息进行判断，若负载变大时，控制电源驱动电路的开关电路的开关频率提高，提高电源驱动电路的电源输出；负载变小时，控制电源驱动电路的开关电路的开关频率降低，降低电源驱动电路的电源输出。Judge the load information. If the load becomes larger, the switching frequency of the switching circuit controlling the power supply drive circuit will increase to increase the power output of the power drive circuit; when the load becomes smaller, the switching frequency of the switching circuit controlling the power drive circuit will decrease, reducing the power supply. Power output of the drive circuit.
  2. 根据权利要求1所述的一种电源驱动电路的驱动方法，其中，所述对负载信息进行判断，若负载变大时，控制开关电路的开关频率提高，提高电源驱动电路的电源输出；负载变小时，控制开关电路的开关频率降低，降低电源驱动电路的电源输出的步骤，包括：A method for driving a power drive circuit according to claim 1, wherein the load information is judged, and if the load becomes larger, the switching frequency of the control switch circuit is increased to increase the power output of the power drive circuit; The steps of reducing the switching frequency of the control switching circuit and reducing the power output of the power drive circuit include:
    获取负载信息，生成振荡信号，若负载变大，控制振荡信号的频率提高；若负载变小，控制振荡信号的频率变低；Obtain load information and generate an oscillation signal. If the load becomes larger, the frequency of the control oscillation signal increases; if the load becomes smaller, the frequency of the control oscillation signal becomes lower;
    根据所述振荡信号，生成开关电路的开关控制信号，控制开关电路导通或断开，调整电源驱动电路的电源输出。According to the oscillating signal, a switch control signal of the switch circuit is generated, the switch circuit is controlled to be turned on or off, and the power output of the power drive circuit is adjusted.
  3. 根据权利要求2所述的一种电源驱动电路的驱动方法，其中，在所述根据所述获取负载信息，生成振荡信号，若负载变大，控制振荡信号的频率提高；若负载变小，控制振荡信号的频率变低步骤中的振荡信号，生成开关电路的开关控制信号，控制开关电路导通或断开，调整电源驱动电路的电源输出的步骤前，包括：A method for driving a power supply drive circuit according to claim 2, wherein in said obtaining load information, an oscillation signal is generated, if the load becomes larger, the frequency of the oscillation signal is controlled to increase; if the load becomes smaller, the control Before the step of reducing the frequency of the oscillation signal to the oscillation signal in the step of generating the switching control signal of the switching circuit, controlling the switching circuit to be turned on or off, and adjusting the power output of the power drive circuit, the steps include:
    获得负载信息，根据负载信息生成负载表征信号；Obtain load information, and generate load characterization signals according to the load information;
    其中，根据所述振荡信号，生成开关电路的开关控制信号，控制开关电路导通或断开，调整电源驱动电路的电源输出的步骤中；Wherein, according to the oscillating signal, generating a switching control signal of the switching circuit, controlling the switching circuit to be turned on or off, and adjusting the power output of the power driving circuit;
    根据所述负载表征信号与所述振荡信号比较生成开关电路的开关控制信号；所述开关控制信号控制开关电路导通或断开，以提高电源驱动电路的电源输出或降低电源驱动电路的电源输出。The switch control signal of the switch circuit is generated according to the comparison between the load characterization signal and the oscillation signal; the switch control signal controls the switch circuit to be turned on or off to increase the power output of the power drive circuit or reduce the power output of the power drive circuit .
  4. 根据权利要求3所述的一种电源驱动电路的驱动方法，其中，所述获得负载信息，根据负载信息生成负载表征信号的步骤包括：A method for driving a power supply driving circuit according to claim 3, wherein the step of obtaining load information and generating a load characterization signal according to the load information comprises:
    获取负载电压信息；Obtain load voltage information;
    判断负载电压信息是否大于一预设电压阈值,若大于预设电压阈值，输出低电平信息；若小于预设电压阈值，则输出高电平信息。It is determined whether the load voltage information is greater than a preset voltage threshold, if it is greater than the preset voltage threshold, low-level information is output; if it is less than the preset voltage threshold, high-level information is output.
  5. 根据权利要求3所述的一种电源驱动电路的驱动方法，其中，所述获取负载信息，生成振荡信号，若负载变大，控制振荡信号的频率提高；若负载变小，控制振荡信号的频率变低的步骤包括：3. A method for driving a power drive circuit according to claim 3, wherein the load information is obtained to generate an oscillation signal, and if the load becomes larger, the frequency of the control oscillation signal is increased; if the load becomes smaller, the frequency of the oscillation signal is controlled Steps to lower include:
    侦测负载信息；Detect load information;
    根据不同的负载信息产生频率控制信号，若负载变大，则产生高频率的频率控制信号；若负载变小，则产生低频率的频率控制信号；将频率控制信号发送给振荡信号生成电路；Generate frequency control signals according to different load information. If the load becomes larger, a high-frequency frequency control signal is generated; if the load becomes smaller, a low-frequency frequency control signal is generated; the frequency control signal is sent to the oscillation signal generating circuit;
    振荡信号生成电路根据所述频率控制信号产生与所述频率控制信号相同频率的振荡信号。The oscillation signal generation circuit generates an oscillation signal of the same frequency as the frequency control signal according to the frequency control signal.
  6. 根据权利要求1所述的一种电源驱动电路的驱动方法，其中，所述驱动方法包括：The driving method of a power supply driving circuit according to claim 1, wherein the driving method comprises:
    生成开关电路的开关控制信号，若负载表征信号与所述振荡信号大于，输出高电平信息，控制开关电路导通，以提高电源电路的电源输出，以提高负载电路的功率；若负载表征信号与所述振荡信号小于，输出低电平，控制开关断开，降低电源电路的电源输出，以降低负载电路的功率。Generate the switch control signal of the switch circuit, if the load characterization signal is greater than the oscillation signal, output high-level information, and control the switch circuit to turn on to increase the power output of the power circuit to increase the power of the load circuit; if the load characterizes the signal When the oscillating signal is lower than the output low level, the control switch is turned off to reduce the power output of the power circuit to reduce the power of the load circuit.
  7. 一种电源驱动电路，所述电源驱动电路包括：A power drive circuit, the power drive circuit includes:
    电源；power supply;
    充放电电路，与所述电源连接；A charging and discharging circuit connected to the power supply;
    开关电路，所述开关电路控制电源对充放电电路进行充放电；A switch circuit, the switch circuit controls the power supply to charge and discharge the charge and discharge circuit;
    第一负载采样电路，获取所述电源驱动电路的负载输出端的负载信息；以及The first load sampling circuit obtains the load information of the load output terminal of the power drive circuit; and
    开关频率控制电路，根据第一负载采样电路得到的负载信息进行判断，若负载输出端的负载变大时，控制开关电路的开关频率提高，提高所述充放电电路的充放电频率；若负载输出端的负载变小时，控制开关电路的开关频率减低，降低所述充放电电路的充放电频率。The switching frequency control circuit judges based on the load information obtained by the first load sampling circuit. If the load at the output end of the load becomes larger, the switching frequency of the control switching circuit is increased to increase the charge and discharge frequency of the charge and discharge circuit; When the load becomes smaller, the switching frequency of the control switching circuit is reduced, and the charging and discharging frequency of the charging and discharging circuit is reduced.
  8. 根据权利要求7所述的一种电源驱动电路，其中，所述开关频率控制电路包括：The power drive circuit according to claim 7, wherein the switching frequency control circuit comprises:
    频率调整电路，根据所述第一负载采样电路得到的负载信息产生频率控制信号，若负载变大，则产生的频率控制信号的频率的变高；若负载变小，则产生的频率控制信号的频率的变低；The frequency adjustment circuit generates a frequency control signal according to the load information obtained by the first load sampling circuit. If the load becomes larger, the frequency of the generated frequency control signal becomes higher; if the load becomes smaller, the frequency of the generated frequency control signal becomes higher. The frequency becomes lower;
    开关信号生成电路，根据所述频率调整电路生成的频率控制信号，生成所述开关电路的开关控制信号，所述开关控制信号的频率与所述频率控制信号的频率一致，所述开关电路根据所述开关控制信号导通或断开。The switching signal generating circuit generates a switching control signal of the switching circuit according to the frequency control signal generated by the frequency adjusting circuit, the frequency of the switching control signal is consistent with the frequency of the frequency control signal, and the switching circuit is The switch control signal is turned on or off.
  9. 根据权利要求7所述的一种电源驱动电路，其中，所述电源驱动电路还包括；The power drive circuit according to claim 7, wherein the power drive circuit further comprises;
    第二负载采样电路，与所述开关信号生成电路连接，所述第二负载采样电路包括：The second load sampling circuit is connected to the switch signal generating circuit, and the second load sampling circuit includes:
    分压电路,连接与所述电源驱动电路的负载输出端，输出一分压电压；以及A voltage divider circuit connected to the load output terminal of the power drive circuit to output a divided voltage; and
    第二比较电路，获得所述分压电路的分压电压并与一预设的参考电压进行计算，输出负载表征信号给所述开关信号生成电路；The second comparison circuit obtains the divided voltage of the voltage divider circuit and calculates it with a preset reference voltage, and outputs a load characterizing signal to the switching signal generating circuit;
    其中，所述开关信号生成电路包括：Wherein, the switch signal generating circuit includes:
    振荡信号生成电路，根据所述频率调整电路生成的频率控制信号产生振荡信号；以及An oscillating signal generating circuit, which generates an oscillating signal according to the frequency control signal generated by the frequency adjusting circuit; and
    第一比较电路，接收所述振荡信号生成电路的振荡信号，并根据所述第二负载采样电路输出的所述负载表征信号生成所述开关控制信号。The first comparison circuit receives the oscillation signal of the oscillation signal generation circuit, and generates the switch control signal according to the load characterization signal output by the second load sampling circuit.
  10. 根据权利要求7所述的一种电源驱动电路，其中，所述电源为直流电源。A power drive circuit according to claim 7, wherein the power source is a DC power source.
  11. 根据权利要求9所述的一种电源驱动电路，其中，所述充放电电路包括相互连接的电感、二极管以及稳压电容；所述二极管设置在所述电感与所述稳压电容之间，所述电感、二极管，稳压电容设置在所述电源的正负极之间，所述开关电路与所述稳压电容并联，所述二极管在电源正向输出方向单向导通。The power drive circuit according to claim 9, wherein the charging and discharging circuit includes an inductor, a diode, and a voltage stabilizing capacitor connected to each other; the diode is arranged between the inductor and the voltage stabilizing capacitor, so The inductor, the diode, and the stabilized capacitor are arranged between the positive and negative electrodes of the power supply, the switch circuit is connected in parallel with the stabilized capacitor, and the diode is unidirectionally conducted in the forward output direction of the power supply.
  12. 根据权利要求9所述的一种电源驱动电路，其中，所述分压电路包括串联的第一分压电阻和第二分压电阻，所述分压电压为第一分压电阻和第二分压电阻之间的电压。The power drive circuit according to claim 9, wherein the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor connected in series, and the divided voltage is the first voltage dividing resistor and the second voltage dividing resistor. Voltage between piezoresistors.
  13. 根据权利要求9所述的一种电源驱动电路，其中，所述第二比较电路设置为比较器。A power drive circuit according to claim 9, wherein the second comparison circuit is configured as a comparator.
  14. 根据权利要求9所述的一种电源驱动电路，其中，所述电源驱动电路还包括以采样电阻，所述采样电阻串联于所述开关电路的输出与接地端。9. A power drive circuit according to claim 9, wherein the power drive circuit further comprises a sampling resistor, and the sampling resistor is connected in series with the output of the switch circuit and the ground.
  15. 根据权利要求9所述的一种电源驱动电路，其中，所述开关频率控制电路包括三角波振荡器，所述三角波振荡器根据生成频率信号产生对应的三角波信号；The power drive circuit according to claim 9, wherein the switching frequency control circuit comprises a triangular wave oscillator, and the triangular wave oscillator generates a corresponding triangular wave signal according to the generated frequency signal;
    其中，当所述三角波信号大于所述负载表征信号，则生成的开关控制信号为低电平；若三角波信号小于所述负载表征信号，则生成的开关控制信号为高电平；其输出的开关控制信号为一方波信号。Wherein, when the triangle wave signal is greater than the load characterization signal, the generated switch control signal is low level; if the triangle wave signal is less than the load characterization signal, the generated switch control signal is high level; the output switch The control signal is a square wave signal.
  16. 根据权利要求11所述的一种电源驱动电路，其中，所述第一比较电路直接连接于电源的负载输出端，依据所述电感与所述二极管之间的电压作为负载信息。11. The power drive circuit according to claim 11, wherein the first comparison circuit is directly connected to the load output terminal of the power supply, and the voltage between the inductor and the diode is used as load information.
  17. 一种显示装置，所述显示装置包括电源驱动电路，以及由所述电源驱动电路供电的显示面板，所述电源驱动电路包括：A display device, the display device includes a power drive circuit, and a display panel powered by the power drive circuit, the power drive circuit includes:
    电源；power supply;
    充放电电路，与所述电源连接；A charging and discharging circuit connected to the power supply;
    开关电路，所述开关电路控制电源对充放电电路进行充放电；A switch circuit, the switch circuit controls the power supply to charge and discharge the charge and discharge circuit;
    第一负载采样电路，获取所述电源驱动电路的负载输出端的负载信息；以及The first load sampling circuit obtains the load information of the load output terminal of the power drive circuit; and
    开关频率控制电路，根据第一负载采样电路得到的负载信息进行判断，若负载输出端的负载变大时，控制开关电路的开关频率提高，提高所述充放电电路的充放电频率；若负载输出端的负载变小时，控制开关电路的开关频率减低，降低所述充放电电路的充放电频率。The switching frequency control circuit judges based on the load information obtained by the first load sampling circuit. If the load at the output end of the load becomes larger, the switching frequency of the control switching circuit is increased to increase the charge and discharge frequency of the charge and discharge circuit; When the load becomes smaller, the switching frequency of the control switching circuit is reduced, and the charging and discharging frequency of the charging and discharging circuit is reduced.
PCT/CN2020/081351 2019-04-04 2020-03-26 Driving method for power supply drive circuit, power supply drive circuit and display device WO2020200027A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910271004.6 2019-04-04
CN201910271004.6A CN110120204B (en) 2019-04-04 2019-04-04 Driving method of power supply driving module, power supply driving module and display device

Publications (1)

Publication Number Publication Date
WO2020200027A1 true WO2020200027A1 (en) 2020-10-08

Family

ID=67520829

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/081351 WO2020200027A1 (en) 2019-04-04 2020-03-26 Driving method for power supply drive circuit, power supply drive circuit and display device

Country Status (2)

Country Link
CN (1) CN110120204B (en)
WO (1) WO2020200027A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110120204B (en) * 2019-04-04 2020-12-25 惠科股份有限公司 Driving method of power supply driving module, power supply driving module and display device
CN114614849A (en) * 2020-12-08 2022-06-10 南昌华勤电子科技有限公司 Voltage regulation circuit, method, chip and equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1453762A (en) * 2002-04-23 2003-11-05 三星电子株式会社 Efficient liquid crystal display drive voltage generating circuit and its method
CN101739934A (en) * 2008-11-25 2010-06-16 株式会社日立显示器 Power supply circuit of display device and display device using the same
US20110169870A1 (en) * 2010-01-14 2011-07-14 Jung-Ping Yang Method and Device for Cancelling Deviation Voltage of a Source Driver of a Liquid Crystal Display
CN103996389A (en) * 2014-05-08 2014-08-20 京东方科技集团股份有限公司 Power supply circuit and display device
CN107316618A (en) * 2017-07-19 2017-11-03 深圳市华星光电半导体显示技术有限公司 DC voltage conversion circuit and DC voltage conversion method and liquid crystal display device
CN110120204A (en) * 2019-04-04 2019-08-13 惠科股份有限公司 A kind of driving method of power drives mould group, power drives mould group and display device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101150285A (en) * 2006-09-12 2008-03-26 美国凹凸微系有限公司 Power supply topologies with PWM frequency control
CN102480228B (en) * 2010-11-26 2014-08-13 炬力集成电路设计有限公司 Switching power control system and method thereof
JP5594322B2 (en) * 2012-06-14 2014-09-24 株式会社村田製作所 Switching power supply
CN102832810B (en) * 2012-08-30 2015-04-08 成都芯源***有限公司 Bootstrap voltage refresh control circuit, voltage conversion circuit and related control method
CN103683918B (en) * 2012-09-25 2017-09-01 富士电机株式会社 Switching power unit
CN103138578A (en) * 2013-02-05 2013-06-05 中兴通讯股份有限公司 Circuit control method and circuit control device
JP2014239620A (en) * 2013-06-10 2014-12-18 ソニー株式会社 Switching power supply apparatus, switching power supply control method, and electronic apparatus
CN203675385U (en) * 2013-12-30 2014-06-25 天津三星电子有限公司 LED backlight driving circuit capable of automatically adjusting switching frequency
CN105245098B (en) * 2014-07-02 2019-02-12 南京博兰得电子科技有限公司 Pulse frequency modulator and modulator approach for supply convertor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1453762A (en) * 2002-04-23 2003-11-05 三星电子株式会社 Efficient liquid crystal display drive voltage generating circuit and its method
CN101739934A (en) * 2008-11-25 2010-06-16 株式会社日立显示器 Power supply circuit of display device and display device using the same
US20110169870A1 (en) * 2010-01-14 2011-07-14 Jung-Ping Yang Method and Device for Cancelling Deviation Voltage of a Source Driver of a Liquid Crystal Display
CN103996389A (en) * 2014-05-08 2014-08-20 京东方科技集团股份有限公司 Power supply circuit and display device
CN107316618A (en) * 2017-07-19 2017-11-03 深圳市华星光电半导体显示技术有限公司 DC voltage conversion circuit and DC voltage conversion method and liquid crystal display device
CN110120204A (en) * 2019-04-04 2019-08-13 惠科股份有限公司 A kind of driving method of power drives mould group, power drives mould group and display device

Also Published As

Publication number Publication date
CN110120204B (en) 2020-12-25
CN110120204A (en) 2019-08-13

Similar Documents

Publication Publication Date Title
US6861827B1 (en) Low drop-out voltage regulator and an adaptive frequency compensation
KR100428928B1 (en) Image display device and portable electrical equipment
CN107154243B (en) Driving method, driving device and the display device of display panel
WO2020200027A1 (en) Driving method for power supply drive circuit, power supply drive circuit and display device
US8531163B2 (en) Switching power supply device, integrated circuit, and switching power supply device operation condition setting method
RU2651145C1 (en) Led light control scheme and liquid crystal display device
WO2019015215A1 (en) Dc voltage conversion circuit, dc voltage conversion method and liquid crystal display device
EP2194636B1 (en) Power supply circuit of display device and display device using the same
US20050212462A1 (en) Low-visual noise, jitterized pulse width modulation brightness control circuit
KR101796811B1 (en) Ramp citcuit and dc-dc converter thereof
TW201310135A (en) Liquid crystal display and driving method thereof
JP2008170942A (en) Driving voltage controller
US20050195182A1 (en) Power supply circuit and display system
US9711101B2 (en) Analogy voltage source circuit and display apparatus
WO2021217733A1 (en) Voltage conversion circuit, voltage conversion method, and display device
US7256530B2 (en) Piezoelectric transformer drive circuit and cold cathode tube lighting apparatus
JP3726584B2 (en) Power supply circuit and electro-optical device
CN109509449B (en) Current regulating circuit, driving circuit and display device
US9241376B2 (en) Driver for LED backlight and LED backlight module and liquid crystal display
CN100574078C (en) Power-supply device
KR102385627B1 (en) Power Supply Device, Display Device using the same and Driving Method thereof
CN211908661U (en) Electronic circuit
US7759875B2 (en) Backlight module and current providing circuit thereof
US20210287603A1 (en) Pixel circuit and display device
CN210429272U (en) VCOM voltage regulating circuit of LCD display screen

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20783988

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 25.02.2022)

122 Ep: pct application non-entry in european phase

Ref document number: 20783988

Country of ref document: EP

Kind code of ref document: A1