WO2014127572A1 - Dc/dc convertor, voltage modulation method and display device - Google Patents

Dc/dc convertor, voltage modulation method and display device Download PDF

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Publication number
WO2014127572A1
WO2014127572A1 PCT/CN2013/074274 CN2013074274W WO2014127572A1 WO 2014127572 A1 WO2014127572 A1 WO 2014127572A1 CN 2013074274 W CN2013074274 W CN 2013074274W WO 2014127572 A1 WO2014127572 A1 WO 2014127572A1
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WO
WIPO (PCT)
Prior art keywords
signal
voltage
converter
switch control
switch
Prior art date
Application number
PCT/CN2013/074274
Other languages
French (fr)
Chinese (zh)
Inventor
汪敏
Original Assignee
合肥京东方光电科技有限公司
京东方科技集团股份有限公司
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Publication of WO2014127572A1 publication Critical patent/WO2014127572A1/en

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Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter

Definitions

  • the present invention relates to the field of switching power supplies, and more particularly to a DC/DC converter, a voltage modulation method, and a display device.
  • the display device includes: a display unit, a power supply, a gamma generator, a timing controller, a gate driver, a data driver, a DC/DC converter, and the like.
  • the timing controller is configured to generate a control signal for controlling the gate driver and the data driver according to the input synchronization signal;
  • the gamma generator is configured to generate a gray scale voltage signal that determines the gray scale information of the data;
  • the gate driver is used to control the gate of the display panel The line is turned on or off; the data driver is used to input data information into the display panel.
  • DC/DC English: Direct Current, Chinese: DC
  • converter is used to convert the power supply form, and supply the converted power to each part of the display device to meet each The need for circuit unit components to work.
  • the key to changing the power supply form of the DC/DC converter is the switching tube it contains.
  • the switch is a power device based on a semiconductor switch structure. By controlling the fast disconnection or conduction of the switching tube, one power supply configuration is converted to another power supply configuration and supplied to the desired circuit unit.
  • the DC/DC converter can not only convert the voltage but also change the frequency.
  • FIG. 2 is a frequency spectrum diagram of the output voltage of the DC/DC converter of the display device when voltage modulation is not performed. It can be seen from Figure 2 that with the fast switching action of the switching tube, the DC/DC converter will be obvious at the switching frequency and higher harmonics. Electromagnetic interference phenomenon. The electromagnetic interference phenomenon generated can contaminate the electromagnetic environment inside the display device and affect the electromagnetic compatibility of other unit components.
  • a technical problem to be solved by embodiments of the present invention is to provide a DC/DC converter, a voltage modulation method, and a display device capable of reducing electromagnetic interference generated when a DC/DC converter is at a switching frequency and a harmonic. , improved electromagnetic compatibility of the display device.
  • An aspect of an embodiment of the present invention provides a DC/DC converter, including: a switch tube; a switch control circuit connected to the switch tube, the switch control circuit is configured to generate a switch control signal, and the switch control signal
  • the output circuit is connected to the output circuit of the switch tube, and the output circuit is configured to output the DC/DC converter according to the on or off of the switch tube.
  • the switch control circuit includes a perturbation signal generator, and the perturbation signal generator is configured to generate a perturbation signal, where the perturbation signal is used to change the switch control signal to make an output voltage of the output circuit It changes as the switch control signal changes.
  • the waveform of the perturbation signal is a sine wave or a square wave.
  • the switch control circuit further includes:
  • a clock oscillating circuit for generating a clock oscillating voltage signal
  • An error amplifier connected between the output circuit and the perturbation signal generator for differentially amplifying the output voltage of the output circuit and the perturbation signal to generate an error voltage signal
  • a switch controller is coupled between the error amplifier and the clock oscillating circuit for differentially comparing the error voltage signal and the clock oscillating voltage signal to generate a new switch control signal.
  • the waveform of the clock oscillating voltage signal is a sawtooth wave.
  • the output circuit includes: a diode, an inductor, a capacitor, a resistor, and a first node, where
  • a diode having an anode connected to the cathode and a cathode connected to the switch tube;
  • An inductor having one end connected to the cathode of the diode and the other end connected to the first section Point
  • a resistor having one end connected to the first node and the other end grounded
  • the first node serves as an output of the output voltage of the DC/DC converter.
  • the switch control circuit further includes: a clock oscillating circuit, an error amplifier, and a switch controller; an output end of the switch controller is connected to a control end of the switch tube, and one end of the clock oscillating circuit is grounded, and the clock oscillates
  • the other end of the circuit is connected to an input end of the switch controller for providing a clock oscillating voltage signal;
  • the perturbation signal generator is grounded at one end, and the other end is connected to a signal input end of the error amplifier for providing a perturbation signal;
  • the other input of the error amplifier is connected to the output of the DC/DC converter, and the output of the error amplifier is connected to the other input of the switch controller.
  • a display device comprising the above described DC/DC converter.
  • a voltage modulation method for a DC/DC converter including the following steps:
  • the switch control signal is changed according to the perturbation signal.
  • the waveform of the perturbation signal is a sine wave or a square wave.
  • the step of changing the switch control signal according to the perturbation signal comprises: differentially amplifying the output voltage of the DC/DC converter and the perturbation signal to generate an error voltage signal;
  • the error voltage signal and the clock oscillating voltage signal are differentially compared to generate a new switch control signal.
  • a DC/DC converter, a voltage modulation method, and a display device generate a perturbation signal by setting a perturbation signal generator, and generate a new switch control signal according to the perturbation signal, thereby changing a DC/DC converter.
  • the output voltage makes the power ⁇ characteristic curve of the DC/DC converter output voltage more gradual, reduces the electromagnetic interference phenomenon generated by the DC/DC converter at the switching frequency and higher harmonics, and improves the electromagnetic of the display device. compatibility.
  • FIG. 1 is a structural block diagram of a prior art display device
  • FIG. 2 is a spectrum characteristic curve of a DC/DC converter output voltage when voltage modulation is not performed
  • FIG. 3 is a structural block diagram of a DC/DC converter according to an embodiment of the present invention
  • FIG. 4 is a second structural block diagram of a DC/DC converter according to an embodiment of the present invention.
  • FIG. 5 is an equivalent circuit diagram of a DC/DC converter according to an embodiment of the present invention.
  • FIG. 7 is a schematic flow chart of a voltage modulation method according to an embodiment of the present invention.
  • FIG. 8 is a second schematic flowchart of a voltage modulation method according to an embodiment of the present invention.
  • Embodiments of the present invention provide a DC/DC converter, a voltage modulation method, and a display device, which can reduce electromagnetic interference generated when a DC/DC converter is at a switching frequency and a harmonic, and improve electromagnetic compatibility of a display device. Sex.
  • the embodiment of the invention provides a DC/DC converter.
  • the DC/DC converter comprises: a switch tube 1, a switch control circuit 2, and an output circuit 3.
  • the rapid change of the on or off state of the switch tube 1 generates the voltage output from the DC/DC converter.
  • the switch control circuit 2 is connected to the switch tube 1 to generate a switch control signal for controlling the change of the working state of the switch tube 1.
  • the output circuit 3 is connected to the switching transistor 1 for outputting the output voltage of the DC/DC converter.
  • the solid line in Fig. 6 indicates the spectral characteristic curve of the output voltage of the DC/DC converter when voltage modulation is not performed.
  • the spectral characteristic curve of the output voltage of the DC/DC converter includes many "spikes” and "sags". These "spikes” and “sags" react to the electromagnetic interference that occurs in the switching frequency and its higher harmonics of the DC/DC converter.
  • a perturbation signal generator 21 is provided in the switch control circuit 2, the perturbation signal generator 21 is used to generate a perturbation signal, and the perturbation signal is used to change the switch control signal so that the output circuit 3 The output voltage changes with it.
  • the wave of the perturbation signal is taken as a specific embodiment of the present invention.
  • the switch control circuit 2 includes a perturbation signal generator 21, a clock oscillation circuit 22, an error amplifier 23, and a switch. Controller 24.
  • the perturbation signal generator 21 is configured to generate a perturbation signal.
  • the clock oscillating circuit 22 generates a clock oscillating voltage signal, and the clock oscillating voltage signal is used as a reference signal for providing a reference frequency during the process of changing the switching control signal by the perturbation signal. Further, the waveform of the clock oscillating voltage signal may be a sawtooth wave.
  • one signal input terminal of the error amplifier 23 receives the output voltage of the above output circuit 3, and the other signal input terminal is connected to the perturbation signal generator 21.
  • the error amplifier 23 differentially amplifies the output voltage and the perturbation signal to generate an error voltage signal. It should be noted that in the process of processing the generated error voltage signal, the perturbation signal as the interference source signal can expand the spectrum of the output voltage, thereby achieving the purpose of making the frequency characteristic curve of the output voltage relatively gentle.
  • one signal input terminal of the switch controller 24 is connected to the output terminal of the clock oscillation circuit 22, and the other signal input terminal is connected to the output terminal of the error amplifier 23. Even.
  • the switch controller 24 receives the clock oscillating voltage signal and the error voltage signal and performs differential comparison processing to generate a new switch control signal.
  • the output end of the switch controller 24 is connected to the switch tube 1, and the switch tube 1 receives the generated new switch control signal, and modulates the output voltage of the output circuit according to the switch control signal, thereby generating New output voltage.
  • the switch control signal includes two states in which the signals of the two states correspond to the on or off states of the switch, for example, the high or low signal levels in the switch control signals respectively correspond to the two switches In the working state, the low level “0" in the switch control signal corresponds to the "off” working state of the switch tube, and the high level “1" in the switch control signal corresponds to the "on” working state of the switch tube.
  • the switch control signal can also control the operation of the switch tube by other means, which is not limited herein.
  • the switch control signal is generated by the clock oscillating voltage signal and the error voltage signal.
  • the switch controller 24 compares the magnitudes of the signal voltage values of the clock oscillating voltage signal and the error voltage signal, when the voltage value of the clock oscillating voltage signal is higher than the voltage value of the error voltage signal.
  • the switch control signal of the high level is generated, the switch is controlled to be turned on; otherwise, the switch control signal of the low level is generated correspondingly, and the switch is controlled to be turned off.
  • a new switch control signal is generated due to the perturbation signal, so that the operating state of the switch tube 1 occurs randomly within a certain range. The variation, thereby extending the energy originally distributed over the switching frequency and higher harmonics to a wider continuous smoother frequency band.
  • the broken line in Fig. 6 shows the spectral characteristic curve of the output voltage of the DC/DC converter output circuit 3 after the voltage modulation process. After comparison, it can be found that the spectrum characteristic curve of the output voltage becomes gentle after the voltage modulation process. Therefore, the perturbation signal generator is set, and a new switch control signal is generated by using the perturbation signal to modulate the output voltage, so that the electromagnetic interference phenomenon of the DC/DC converter is improved, thereby reducing the electromagnetic interference of the DC/DC converter. effect.
  • the perturbation signal generator 21 is set to generate a perturbation signal. No., by changing the perturbation signal, the newly generated switch control signal can be changed, and then changed.
  • the output voltage of the DC/DC converter can finally be controlled to generate an output voltage having a more reasonable frequency characteristic curve by adjusting the perturbation signal, wherein the perturbation signal is generated by the perturbation signal generator 21. Therefore, those skilled in the art can change the perturbation signal by adjusting the relevant parameters of the perturbation signal generator 21, and finally obtain a reasonable output voltage through a series of adjustments, thereby reducing the electromagnetic interference phenomenon of the DC/DC converter, so that the The voltage-modulated DC/DC converter is in a better operating state.
  • the DC/DC converter of the embodiment of the present invention generates a perturbation signal by setting a perturbation signal generator, generates a new switch control signal according to the perturbation signal, thereby changing an output voltage of the DC/DC converter, and performing DC/DC conversion.
  • the power ⁇ characteristic curve of the output voltage of the device is more gradual, reducing the electromagnetic interference phenomenon generated by the DC/DC converter and improving the electromagnetic compatibility of the DC/DC converter.
  • FIG. 5 is an equivalent circuit diagram of a DC/DC converter according to an embodiment of the present invention.
  • the DC/DC converter includes: a switch tube 1, a switch control circuit 2, an output circuit 3, and a power source E.
  • the anode of the power source E is connected to the first end of the switch tube 1, the cathode of the power source E is grounded, and the output circuit 3 Specifically, the diode D, the inductor L, the capacitor C, and the resistor R and the first node may be included, wherein the anode of the diode D is grounded, the cathode of the diode D is connected to the second end of the switch tube 1, and one end of the inductor L is connected to the diode D.
  • the other end of the cathode is connected to the first node, one end of the capacitor C is grounded, the other end is connected to the first node, and the resistor R is connected in parallel with the capacitor C, wherein the first node is the output end of the DC/DC converter; the switch control circuit 2
  • the output end of the switch controller 24 is connected to the control end of the switch tube 1, one end of the clock oscillating circuit 22 is grounded, and the other end of the clock oscillating circuit 22 is connected to an input end of the switch controller 24, Providing a clock oscillating voltage signal;
  • the perturbation signal generator 21 is grounded at one end, and the other end is connected to a signal input end of the error amplifier 23 for providing a perturbation signal;
  • Output terminal of amplifier 23 the other input terminal is connected to a DC / DC converter, the output of the error amplifier 23 is connected to the other input of the switch controller 24.
  • the power source E supplies power to the DC/DC converter as a power supply portion, and the switch control circuit 2 generates a switch control signal u, and the switch control signal u controls the on or off of the switch tube 1.
  • the electric energy supplied from the power source E passes through the switching tube 1 and a series of circuit elements in the output circuit 3, and finally the output voltage of the first node is output at the junction of the resistor R and the inductor L.
  • changing the operating state of the switching transistor 1 causes the output voltage of the output circuit 3 to change.
  • the output voltage of the output circuit 3 is referred to as the first voltage V1 when no voltage modulation is performed; the output voltage of the output circuit 3 is referred to as the second voltage when the voltage is modulated.
  • the perturbation signal generator 21 generates a perturbation signal ef.
  • a perturbation signal with a sinusoidal waveform period is taken as an example.
  • V ref k 8 ⁇ ⁇ (2 ⁇ + ⁇ ) + ⁇ ⁇
  • V ref is the perturbation signal generated by the perturbation signal generating circuit, where k is the perturbation intensity of the perturbation signal, and f is the operating frequency of the switching tube.
  • ⁇ is the phase parameter of the perturbation signal
  • ef is the reference voltage value. It should be noted that those skilled in the art can adjust various parameters set in the above-mentioned perturbation signal, or set other types of perturbation signals, for example, setting a perturbation signal with a square wave waveform as a period, thereby adjusting Perturbation signal.
  • the clock oscillation circuit 22 generates a clock oscillation voltage signal. For example, taking the clock oscillating voltage signal of the sawtooth period as an example, suppose ⁇ mmp WV ) ( ⁇ modl ⁇
  • One signal input terminal of the error amplifier 23 receives the first voltage, and the other signal input terminal is connected to the perturbation signal generator 21, that is, receives the first voltage ⁇ and the above-described perturbation signal V ref and processes it.
  • the error amplifier 23 is based on a differential amplifier structure.
  • the first voltage is V1
  • the first voltage V1 and the perturbation signal V ref are differentially amplified, and the generated error voltage can be expressed as .
  • n ⁇ ⁇ - l ref ),
  • A is a constant used to modulate the voltage strength of the error voltage.
  • One signal input terminal of the switch controller 24 is connected to the clock oscillation circuit 22, and the other signal input terminal is connected to the error amplifier 23, and receives the clock oscillation voltage V ramp and the error voltage V c generated by the error amplifier 23. n and process.
  • the switch controller 24 compares the clock oscillating voltage V ramp and the error voltage V e based on the differential comparator configuration. n generates a switch control signal u. For example: When V ramp ⁇ V c . At n , the switch controller 24 generates a switch control signal u of low level "0"; and when V ramp > V c . When n , the switch controller 24 generates a switch control signal of a high level "1" ⁇
  • the switch tube 1 receives the switch control signal u and controls the switching off or on according to the level change of the switch control signal u. Therefore, the operation of the entire DC/DC converter can be described as follows.
  • the power supply E is responsible for supplying power, and the output voltage is output at the junction of the resistor R and the inductor L, that is, the first node.
  • the voltage Vl is output.
  • the perturbation signal V ref is input, and a new switch control signal u is generated through a series of calculations and the operation state of controlling the disconnection or conduction of the switch tube 1 is changed.
  • a new output voltage v 2 is finally generated by a series of circuit elements in the output circuit 3.
  • the above voltage modulation process ultimately reflects the process of modulating the DC/DC converter output voltage through the perturbation signal V ref , which produces the output voltage from ⁇ weeks to v 2 . Therefore, the perturbation signal V ref changes the output voltage of the DC/DC converter.
  • the parameter corresponding to the perturbation signal V ref an ideal output voltage of the frequency characteristic curve is generated, thereby reducing the electromagnetic interference phenomenon of the DC/DC converter, so that the voltage-modulated DC/DC converter is optimal.
  • a DC/DC converter generates a perturbation signal by setting a perturbation signal generator, and generates a new switch control signal according to the perturbation signal, thereby changing an output voltage of the DC/DC converter to make DC/
  • the power spectrum characteristic curve of the DC converter output voltage is more gradual, reducing the electromagnetic interference phenomenon generated by the DC/DC converter and improving the electromagnetic compatibility of the DC/DC converter.
  • an embodiment of the present invention further provides a display device, including the DC/DC converter in the above embodiment, wherein the DC/DC converter is configured to receive a power supply voltage and perform voltage conversion for the display device.
  • the DC/DC converter is configured to receive a power supply voltage and perform voltage conversion for the display device.
  • Each part of the circuit provides the voltage required for operation.
  • the analog voltage required for the operation of the gate driver and the digital voltage are provided by the DC/DC converter to convert the voltage.
  • the DC/DC converter voltage is converted to voltage to ensure proper operation of the gate driver.
  • the perturbation signal generator is set to generate a perturbation signal, and the electromagnetic interference phenomenon of the DC/DC converter is reduced, so that the voltage-modulated DC/DC converter is at The optimum working condition, in turn, further improves the electromagnetic compatibility of the display device.
  • display device other Part of the structure can refer to the prior art, which will not be described in detail herein.
  • the display device provided by the embodiment of the present invention may be a product or a component having a display function, such as a display, a flat panel television, a digital photo frame, a mobile phone, a tablet computer, etc., which is not limited by the present invention.
  • a display device wherein a DC/DC converter of the display device is provided with a perturbation signal generator, so that a power spectrum characteristic curve of a DC/DC converter output voltage is more gradual, and DC/DC is reduced.
  • the electromagnetic interference phenomenon generated by the converter improves the electromagnetic compatibility of the display device.
  • an embodiment of the present invention further provides a voltage modulation method for a DC/DC converter.
  • the voltage modulation method of this embodiment includes the following steps:
  • the voltage modulation method utilizes the DC/DC converter provided by the above embodiment.
  • the DC/DC converter includes: a switch tube 1, a switch control circuit 2, Output circuit 3.
  • a perturbation signal generator 21 is provided in the switch control circuit 2, and the perturbation signal generator 21 is used to generate a perturbation signal.
  • the waveform of the perturbation signal is a sine wave or a square wave. The purpose of adjusting the perturbation signal is achieved by adjusting the relevant parameters of the perturbation signal generator.
  • step S2 according to the perturbation signal, the process of changing the switch control signal may specifically include the following steps:
  • S21 differentially amplifying the output voltage of the DC/DC converter and the perturbation signal to generate an error voltage signal
  • a voltage modulation method for a DC/DC converter generates a new perturbation signal by setting a perturbation signal, thereby changing a DC/DC converter output voltage to make a DC/DC
  • the power spectrum characteristic curve of the converter output voltage is more Smooth, reduce the electromagnetic interference caused by the DC/DC converter, and improve the electromagnetic compatibility of the DC/DC converter.

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Provided are a DC/DC convertor, a voltage modulation method and a display device. The DC/DC convertor comprises a switch tube (1); a switch control circuit (2) connected to the switch tube, the switch control circuit being used for generating a switch control signal, the switch control signal being used for controlling the ON or OFF of the switch tube; and an output circuit (3) connected to the switch tube, the output circuit being used for outputting the output voltage of the DC/DC convertor according to the ON or OFF of the switch tube. The switch control circuit comprises a perturbation signal generator (21), the perturbation signal generator being used for generating a perturbation signal, the perturbation signal being used for changing the switch control signal, so as to enable the output voltage of the output circuit to vary with the switch control signal. The DC/DC convertor can reduce electromagnetic interference phenomena generated at the switch frequency and higher harmonics, thereby improving the electromagnetic compatibility of the display device.

Description

DC/DC变换器、 电压调制方法及显示装置 技术领域  DC/DC converter, voltage modulation method and display device
本发明涉及开关电源领域， 尤其涉及一种 DC/DC变换器、 电压调 制方法及显示装置。  The present invention relates to the field of switching power supplies, and more particularly to a DC/DC converter, a voltage modulation method, and a display device.
背景技术 Background technique
随着科学技术的不断发展， LCD (英文： Liquid Crystal Display, 中文： 液晶显示器） 、 PDP (英文： Plasma Display Panel, 中文： 等离 子显示板） 、 OLED (英文： Organic Light-Emitting Diode , 中文： 有机 发光二极管）等显示技术日趋成熟， 越来越多的显示装置为人们所熟知 并在日常生活领域中得到了广泛的应用。 举例来说， 以图 1所示的显示 装置为例， 该显示装置包括： 显示面板、 电源、 伽马生成器、 时序控制 器、 栅极驱动器、 数据驱动器、 DC/DC 变换器等结构单元。 其中， 时 序控制器用于根据输入的同步信号生成控制栅极驱动器和数据驱动器 的控制信号； 伽马生成器用于生成决定数据灰阶信息的灰阶电压信号； 栅极驱动器用于控制显示面板中栅线的开启或关闭； 数据驱动器用于将 数据信息输入到显示面板中。 而作为显示装置中的重要组成部分， DC/DC (英文： Direct Current , 中文： 直流电） 变换器用于对电源形态 进行转换， 并将转换后的电源提供给显示装置的各部分电路， 以满足各 电路单元组件工作的需要。  With the continuous development of science and technology, LCD (English: Liquid Crystal Display, Chinese: LCD), PDP (English: Plasma Display Panel, Chinese: Plasma Display Panel), OLED (English: Organic Light-Emitting Diode, Chinese: Organic Display technologies such as light-emitting diodes are becoming more and more mature, and more and more display devices are well known and widely used in daily life. For example, taking the display device shown in FIG. 1 as an example, the display device includes: a display unit, a power supply, a gamma generator, a timing controller, a gate driver, a data driver, a DC/DC converter, and the like. Wherein, the timing controller is configured to generate a control signal for controlling the gate driver and the data driver according to the input synchronization signal; the gamma generator is configured to generate a gray scale voltage signal that determines the gray scale information of the data; and the gate driver is used to control the gate of the display panel The line is turned on or off; the data driver is used to input data information into the display panel. As an important part of the display device, DC/DC (English: Direct Current, Chinese: DC) converter is used to convert the power supply form, and supply the converted power to each part of the display device to meet each The need for circuit unit components to work.
DC/DC 变换器变换电源形态的关键在于其所包含的开关管。 开关 管是一种基于半导体开关结构的功率器件。通过控制开关管的快速断开 或导通两种工作状态，从而将一种电源形态转变为另一种电源形态并提 供给所需的电路单元。 DC/DC 变换器不仅可以转换电压， 还可以变换 频率。  The key to changing the power supply form of the DC/DC converter is the switching tube it contains. The switch is a power device based on a semiconductor switch structure. By controlling the fast disconnection or conduction of the switching tube, one power supply configuration is converted to another power supply configuration and supplied to the desired circuit unit. The DC/DC converter can not only convert the voltage but also change the frequency.
但发明人在研发过程中发现现有技术至少存在以下缺陷： 随着显示 装置内部电路单元組件复杂程度的提高， DC/DC 变换器所要提供的电 源形态也变得更为复杂。 如图 2所示， 图 2为未进行电压调制时显示装 置 DC/DC变换器输出电压的频谱图。 从图 2 中可以发现， 随着开关管 快速开关动作， DC/DC 变换器在开关频率及高次谐波处时会产生明显 的电磁千扰现象。 产生的电磁千扰现象会污染显示装置内部的电磁环 境， 影响其它单元组件的电磁兼容性。 However, the inventors found in the development process that the prior art has at least the following drawbacks: As the complexity of the internal circuit unit components of the display device increases, the form of the power supply to be provided by the DC/DC converter becomes more complicated. As shown in FIG. 2, FIG. 2 is a frequency spectrum diagram of the output voltage of the DC/DC converter of the display device when voltage modulation is not performed. It can be seen from Figure 2 that with the fast switching action of the switching tube, the DC/DC converter will be obvious at the switching frequency and higher harmonics. Electromagnetic interference phenomenon. The electromagnetic interference phenomenon generated can contaminate the electromagnetic environment inside the display device and affect the electromagnetic compatibility of other unit components.
发明内容 Summary of the invention
本发明的实施例所要解决的技术问题在于提供一种 DC/DC 变换 器、 电压调制方法及显示装置， 其能够减少 DC/DC 变换器在开关频率 及高次谐波处时产生的电磁干扰现象， 提高了显示装置的电磁兼容性。  A technical problem to be solved by embodiments of the present invention is to provide a DC/DC converter, a voltage modulation method, and a display device capable of reducing electromagnetic interference generated when a DC/DC converter is at a switching frequency and a harmonic. , improved electromagnetic compatibility of the display device.
本发明实施例的一方面， 提供一种 DC/DC变换器， 包括： 开关管； 连接于所述开关管的开关控制电路， 所述开关控制电路用于生成开关控 制信号， 所述开关控制信号用于控制所述开关管的导通或断开； 连接于 所述开关管的输出电路， 所述输出电路用于根据所述开关管的导通或断 开， 输出所述 DC/DC变换器的输出电压；  An aspect of an embodiment of the present invention provides a DC/DC converter, including: a switch tube; a switch control circuit connected to the switch tube, the switch control circuit is configured to generate a switch control signal, and the switch control signal The output circuit is connected to the output circuit of the switch tube, and the output circuit is configured to output the DC/DC converter according to the on or off of the switch tube. Output voltage
其中， 所述开关控制电路包括微扰信号生成器， 所述微扰信号生成 器用于生成微扰信号， 所述微扰信号用于改变所述开关控制信号， 以使 所述输出电路的输出电压随所述开关控制信号的变化而改变。  The switch control circuit includes a perturbation signal generator, and the perturbation signal generator is configured to generate a perturbation signal, where the perturbation signal is used to change the switch control signal to make an output voltage of the output circuit It changes as the switch control signal changes.
根据一实施例， 所述微扰信号的波形为正弦波或者方波。  According to an embodiment, the waveform of the perturbation signal is a sine wave or a square wave.
根据一实施例， 所述开关控制电路还包括：  According to an embodiment, the switch control circuit further includes:
时钟振荡电路， 用于生成时钟振荡电压信号；  a clock oscillating circuit for generating a clock oscillating voltage signal;
误差放大器， 连接于所述输出电路和所述微扰信号生成器之间， 用 于差分放大处理所述输出电路的输出电压以及所述微扰信号， 生成误差 电压信号；  An error amplifier connected between the output circuit and the perturbation signal generator for differentially amplifying the output voltage of the output circuit and the perturbation signal to generate an error voltage signal;
开关控制器， 连接于所述误差放大器和所述时钟振荡电路之间， 用 于差分比较所述误差电压信号以及所述时钟振荡电压信号以生成新的 开关控制信号。  A switch controller is coupled between the error amplifier and the clock oscillating circuit for differentially comparing the error voltage signal and the clock oscillating voltage signal to generate a new switch control signal.
根据一实施例， 所述时钟振荡电压信号的波形为锯齿波。  According to an embodiment, the waveform of the clock oscillating voltage signal is a sawtooth wave.
根据一实施例， 优选的， 所述输出电路包括： 二极管、 电感、 电容、 电阻以及第一节点， 其中，  According to an embodiment, the output circuit includes: a diode, an inductor, a capacitor, a resistor, and a first node, where
二极管， 其阳极接地， 阴极连接于所述开关管；  a diode having an anode connected to the cathode and a cathode connected to the switch tube;
电感， 其一端连接于所述二极管的阴极， 另一端连接于所述第一节 点； An inductor having one end connected to the cathode of the diode and the other end connected to the first section Point
电容， 其一端连接于所述第一节点， 另一端接地；  a capacitor, one end of which is connected to the first node, and the other end of which is grounded;
电阻， 其一端连接于所述第一节点， 另一端接地； 以及  a resistor having one end connected to the first node and the other end grounded;
第一节点， 作为所述 DC/DC变换器输出电压的输出端。  The first node serves as an output of the output voltage of the DC/DC converter.
根据一实施例， 所述开关控制电路还包括： 时钟振荡电路、 误差放 大器及开关控制器； 该开关控制器的输出端连接于开关管的控制端， 该 时钟振荡电路的一端接地， 该时钟振荡电路的另一端连接于开关控制器 的一输入端，用于提供时钟振荡电压信号；该微扰信号生成器一端接地， 另一端连接于误差放大器的一信号输入端， 用于提供微扰信号； 该误差 放大器的另一输入端连接于 DC/DC变换器的输出端， 误差放大器的输 出端连接于开关控制器的另一输入端。  According to an embodiment, the switch control circuit further includes: a clock oscillating circuit, an error amplifier, and a switch controller; an output end of the switch controller is connected to a control end of the switch tube, and one end of the clock oscillating circuit is grounded, and the clock oscillates The other end of the circuit is connected to an input end of the switch controller for providing a clock oscillating voltage signal; the perturbation signal generator is grounded at one end, and the other end is connected to a signal input end of the error amplifier for providing a perturbation signal; The other input of the error amplifier is connected to the output of the DC/DC converter, and the output of the error amplifier is connected to the other input of the switch controller.
根据本发明实施例的再一方面， 提供一种显示装置， 包括上述所述 的 DC/DC变换器。  According to still another aspect of an embodiment of the present invention, there is provided a display device comprising the above described DC/DC converter.
根据本发明实施例的再一方面， 提供一种 DC/DC变换器的电压调 制方法， 包括以下步骤：  According to still another aspect of an embodiment of the present invention, a voltage modulation method for a DC/DC converter is provided, including the following steps:
生成微扰信号；  Generating a perturbation signal;
根据所述微扰信号， 改变开关控制信号。  The switch control signal is changed according to the perturbation signal.
根据一实施例， 所述微扰信号的波形为正弦波或者方波。  According to an embodiment, the waveform of the perturbation signal is a sine wave or a square wave.
根据一实施例，根据所述微扰信号，改变开关控制信号的步骤包括： 差分放大处理所述 DC/DC变换器的输出电压以及所述微扰信号， 生成误差电压信号；  According to an embodiment, the step of changing the switch control signal according to the perturbation signal comprises: differentially amplifying the output voltage of the DC/DC converter and the perturbation signal to generate an error voltage signal;
生成时钟振荡电压信号； 以及  Generating a clock oscillating voltage signal;
差分比较所述误差电压信号以及所述时钟振荡电压信号以生成新 的开关控制信号。  The error voltage signal and the clock oscillating voltage signal are differentially compared to generate a new switch control signal.
根据本发明实施例的 DC/DC变换器、 电压调制方法及显示装置， 通过设置微扰信号生成器生成微扰信号，根据微扰信号生成新的开关控 制信号， 从而改变 DC/DC变换器的输出电压， 使 DC/DC变换器输出电 压的功率谙特性曲线变得更为平緩， 减少 DC/DC变换器在开关频率及 高次谐波处时产生的电磁干扰现象， 提高了显示装置的电磁兼容性。 附图说明 A DC/DC converter, a voltage modulation method, and a display device according to an embodiment of the present invention generate a perturbation signal by setting a perturbation signal generator, and generate a new switch control signal according to the perturbation signal, thereby changing a DC/DC converter. The output voltage makes the power 谙 characteristic curve of the DC/DC converter output voltage more gradual, reduces the electromagnetic interference phenomenon generated by the DC/DC converter at the switching frequency and higher harmonics, and improves the electromagnetic of the display device. compatibility. DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将 对实施例描述中所需要使用的附图作筒单地介绍。 显而易见地， 下面描 述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来 讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附 图。  In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative work.
图 1为现有技术显示装置的结构框图；  1 is a structural block diagram of a prior art display device;
图 2为未进行电压调制时 DC/DC变换器输出电压的频谱特征曲线； 图 3为本发明实施例中 DC/DC变换器的结构框图之一；  2 is a spectrum characteristic curve of a DC/DC converter output voltage when voltage modulation is not performed; FIG. 3 is a structural block diagram of a DC/DC converter according to an embodiment of the present invention;
图 4为本发明实施例中 DC/DC变换器的结构框图之二；  4 is a second structural block diagram of a DC/DC converter according to an embodiment of the present invention;
图 5为本发明实施例中 DC/DC变换器的等效电路图；  FIG. 5 is an equivalent circuit diagram of a DC/DC converter according to an embodiment of the present invention; FIG.
图 6为本发明实施例中 DC/DC变换器电压调制前与电压调制后的 输出电压的频谱特征曲线；  6 is a spectrum characteristic curve of an output voltage before voltage modulation and voltage modulation of a DC/DC converter according to an embodiment of the present invention;
图 7为本发明实施例中电压调制方法的流程示意图之一；  7 is a schematic flow chart of a voltage modulation method according to an embodiment of the present invention;
图 8为本发明实施例中电压调制方法的流程示意图之二。  FIG. 8 is a second schematic flowchart of a voltage modulation method according to an embodiment of the present invention.
具体实施方式 detailed description
本发明实施例提供一种 DC/DC变换器、 电压调制方法及显示装置， 能够减少 DC/DC 变换器在开关频率及高次谐波处时产生的电磁干扰现 象， 提高了显示装置的电磁兼容性。  Embodiments of the present invention provide a DC/DC converter, a voltage modulation method, and a display device, which can reduce electromagnetic interference generated when a DC/DC converter is at a switching frequency and a harmonic, and improve electromagnetic compatibility of a display device. Sex.
以下描述中，为了说明而不是为了限定，提出了诸如特定***结构、 接口、 技术之类的具体细节， 以便透彻理解本发明。 然而， 本领域的技 术人员应当清楚， 在没有这些具体细节的其它实施例中也可以实现本发 明。在其它情况中， 省略对众所周知的装置、 电路以及方法的详细说明， 以免不必要的细节妨碍对本发明的描述。  In the following description, for purposes of explanation and description, reference However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the invention.
本发明实施例提供一种 DC/DC变换器， 如图 3所示， 该 DC/DC变 换器包括： 开关管 1、 开关控制电路 2、 输出电路 3。 其中， 开关管 1 导通或断开工作状态的快速变化生成 DC/DC 变换器输出的电压。 当开 关管 1 处于断开状态时， DC/DC变换器的电路切断； 当开关管 1 处于 导通状态时， DC/DC 变换器的电路接通。 开关控制电路 2 与开关管 1 相连， 生成开关控制信号， 用于控制开关管 1工作状态的变化。 输出电 路 3与开关管 1相连， 用于输出 DC/DC变换器的输出电压。 The embodiment of the invention provides a DC/DC converter. As shown in FIG. 3, the DC/DC converter comprises: a switch tube 1, a switch control circuit 2, and an output circuit 3. Among them, the rapid change of the on or off state of the switch tube 1 generates the voltage output from the DC/DC converter. When When the switch 1 is in the off state, the circuit of the DC/DC converter is cut off; when the switch 1 is in the on state, the circuit of the DC/DC converter is turned on. The switch control circuit 2 is connected to the switch tube 1 to generate a switch control signal for controlling the change of the working state of the switch tube 1. The output circuit 3 is connected to the switching transistor 1 for outputting the output voltage of the DC/DC converter.
事实上， 在未进行电压调制情况下， 输出电路 3的输出电压存在着 电磁干扰现象。 例如， 如图 6所示， 图 6中实线表示未进行电压调制时 DC/DC 变换器输出电压的频谱特征曲线。 可以观察到， DC/DC 变换器 输出电压的频谱特征曲线中包括了很多 "尖峰 "和 "凹陷" 。 而这些 "尖 峰" 和 "凹陷" 反应的便是 DC/DC 变换器在开关频率及其高次谐波处 中存在的电磁千扰现象。 若要减少 DC/DC 变换器的电磁干扰现象， 就 要设法降低在这些 "尖峰" 和 "凹陷" 处输出电压的功率， 从在频谱特 征曲线上看也就是要使 DC/DC 变换器的输出电压频语特征曲线分布的 更加平滑。  In fact, there is electromagnetic interference at the output voltage of the output circuit 3 without voltage modulation. For example, as shown in Fig. 6, the solid line in Fig. 6 indicates the spectral characteristic curve of the output voltage of the DC/DC converter when voltage modulation is not performed. It can be observed that the spectral characteristic curve of the output voltage of the DC/DC converter includes many "spikes" and "sags". These "spikes" and "sags" react to the electromagnetic interference that occurs in the switching frequency and its higher harmonics of the DC/DC converter. To reduce the electromagnetic interference of the DC/DC converter, try to reduce the power of the output voltage at these "spikes" and "sags". From the spectrum characteristic curve, the output of the DC/DC converter is required. The voltage frequency characteristic curve distribution is smoother.
因此， 如图 3所示， 在开关控制电路 2中设置微扰信号生成器 21， 微扰信号生成器 21 用于生成微扰信号， 利用微扰信号来改变开关控制 信号， 以使输出电路 3的输出电压随着改变。 进一步的， 微扰信号的波 作为本发明的一种具体实施方式， 举例来说， 如图 4所示， 开关控 制电路 2包括微扰信号生成器 21、 时钟振荡电路 22、 误差放大器 23、 开关控制器 24。 其中， 微扰信号生成器 21用于生成微扰信号。 时钟振 荡电路 22, 生成时钟振荡电压信号， 时钟振荡电压信号作为基准信号， 用于在微扰信号改变开关控制信号的过程中提供一个基准频率。 进一步 的， 所述时钟振荡电压信号的波形可为锯齿波。  Therefore, as shown in FIG. 3, a perturbation signal generator 21 is provided in the switch control circuit 2, the perturbation signal generator 21 is used to generate a perturbation signal, and the perturbation signal is used to change the switch control signal so that the output circuit 3 The output voltage changes with it. Further, the wave of the perturbation signal is taken as a specific embodiment of the present invention. For example, as shown in FIG. 4, the switch control circuit 2 includes a perturbation signal generator 21, a clock oscillation circuit 22, an error amplifier 23, and a switch. Controller 24. The perturbation signal generator 21 is configured to generate a perturbation signal. The clock oscillating circuit 22 generates a clock oscillating voltage signal, and the clock oscillating voltage signal is used as a reference signal for providing a reference frequency during the process of changing the switching control signal by the perturbation signal. Further, the waveform of the clock oscillating voltage signal may be a sawtooth wave.
然后， 如图 4所示， 误差放大器 23的一个信号输入端接收上述输 出电路 3的输出电压， 另一个信号输入端与微扰信号生成器 21相连。 误差放大器 23对输出电压以及微扰信号进行差分放大处理， 生成误差 电压信号。 需要说明的是， 在处理生成误差电压信号的过程中， 微扰信 号作为干扰源信号， 可使得输出电压的频谱得到扩展， 从而达到使输出 电压的频语特征曲线变得较为平緩的目的。  Then, as shown in Fig. 4, one signal input terminal of the error amplifier 23 receives the output voltage of the above output circuit 3, and the other signal input terminal is connected to the perturbation signal generator 21. The error amplifier 23 differentially amplifies the output voltage and the perturbation signal to generate an error voltage signal. It should be noted that in the process of processing the generated error voltage signal, the perturbation signal as the interference source signal can expand the spectrum of the output voltage, thereby achieving the purpose of making the frequency characteristic curve of the output voltage relatively gentle.
然后， 如图 4所示， 开关控制器 24的一个信号输入端与时钟振荡 电路 22的输出端相连， 另一个信号输入端与误差放大器 23的输出端相 连。 开关控制器 24接收时钟振荡电压信号以及误差电压信号并进行差 分比较处理， 以生成新的开关控制信号。 Then, as shown in FIG. 4, one signal input terminal of the switch controller 24 is connected to the output terminal of the clock oscillation circuit 22, and the other signal input terminal is connected to the output terminal of the error amplifier 23. Even. The switch controller 24 receives the clock oscillating voltage signal and the error voltage signal and performs differential comparison processing to generate a new switch control signal.
然后， 如图 4所示， 开关控制器 24的输出端与开关管 1相连， 开 关管 1接收所生成的新的开关控制信号， 并根据开关控制信号对输出电 路的输出电压进行调制， 从而产生新的输出电压。  Then, as shown in FIG. 4, the output end of the switch controller 24 is connected to the switch tube 1, and the switch tube 1 receives the generated new switch control signal, and modulates the output voltage of the output circuit according to the switch control signal, thereby generating New output voltage.
需要说明的是， 开关管 1 作为一种基于半导体开关结构的功率器 件， 其工作状态有导通或断开两种。 因此， 开关控制信号包括两种状态 的信号分别对应开关管的导通或断开的两种工作状态， 举例来说， 利用 开关控制信号中信号电平的高或低来分别对应开关管的两种工作状态， 开关控制信号中的低电平 " 0" 对应开关管的 "断开" 工作状态、 开关 控制信号中的高电平 " 1 " 则对应开关管的 "导通" 工作状态。 当然， 本领域技术人员应该明白上述对开关管控制方式的描述仅为更加清楚 的描述本实施例， 开关控制信号也可以通过其他方式控制开关管的工 作， 在此不做限定。  It should be noted that the switch tube 1 is a power device based on a semiconductor switch structure, and its working state is either turned on or off. Therefore, the switch control signal includes two states in which the signals of the two states correspond to the on or off states of the switch, for example, the high or low signal levels in the switch control signals respectively correspond to the two switches In the working state, the low level "0" in the switch control signal corresponds to the "off" working state of the switch tube, and the high level "1" in the switch control signal corresponds to the "on" working state of the switch tube. Of course, those skilled in the art should understand that the above description of the control mode of the switch tube is only for a clearer description of the embodiment. The switch control signal can also control the operation of the switch tube by other means, which is not limited herein.
另外， 开关控制信号是由时钟振荡电压信号以及误差电压信号经处 理产生的。 具体的处理过程， 举例来说， 开关控制器 24 比较时钟振荡 电压信号以及误差电压信号两者信号电压值的大小， 当所述时钟振荡电 压信号的电压值高于所述误差电压信号的电压值时， 对应生成高电平的 开关控制信号， 此时控制导通开关管； 反之， 则对应生成低电平的开关 控制信号， 此时控制断开开关管。  In addition, the switch control signal is generated by the clock oscillating voltage signal and the error voltage signal. For a specific processing procedure, for example, the switch controller 24 compares the magnitudes of the signal voltage values of the clock oscillating voltage signal and the error voltage signal, when the voltage value of the clock oscillating voltage signal is higher than the voltage value of the error voltage signal. When the switch control signal of the high level is generated, the switch is controlled to be turned on; otherwise, the switch control signal of the low level is generated correspondingly, and the switch is controlled to be turned off.
另外， 需要说明的是， 对于电压调制后 DC/DC 变换器输出电路 3 的输出电压而言， 由于微扰信号生成了新的开关控制信号， 使得开关管 1的工作状态在一定范围内发生随机变化， 由此将原本分布在开关频率 及高次谐波上的能量扩展到了更宽的连续平滑的频带上。 如图 6所示， 图 6 中虚线表示经过电压调制过程后， DC/DC变换器输出电路 3 的输 出电压的频谱特征曲线。 比较观察后可以发现， 经过电压调制过程后， 输出电压的频谱特征曲线变得较为平緩。 因此， 设置微扰信号生成器， 利用微扰信号生成新的开关控制信号， 对输出电压进行调制， 使得 DC/DC变换器的电磁干扰现象得到改善， 从而达到降低 DC/DC变换器 电磁干扰的效果。  In addition, it should be noted that, for the output voltage of the DC/DC converter output circuit 3 after voltage modulation, a new switch control signal is generated due to the perturbation signal, so that the operating state of the switch tube 1 occurs randomly within a certain range. The variation, thereby extending the energy originally distributed over the switching frequency and higher harmonics to a wider continuous smoother frequency band. As shown in Fig. 6, the broken line in Fig. 6 shows the spectral characteristic curve of the output voltage of the DC/DC converter output circuit 3 after the voltage modulation process. After comparison, it can be found that the spectrum characteristic curve of the output voltage becomes gentle after the voltage modulation process. Therefore, the perturbation signal generator is set, and a new switch control signal is generated by using the perturbation signal to modulate the output voltage, so that the electromagnetic interference phenomenon of the DC/DC converter is improved, thereby reducing the electromagnetic interference of the DC/DC converter. effect.
还有一点需要特别说明的是， 设置微扰信号生成器 21 生成微扰信 号， 通过改变微扰信号可以改变新生成的开关控制信号， 进而改变Another point to be noted is that the perturbation signal generator 21 is set to generate a perturbation signal. No., by changing the perturbation signal, the newly generated switch control signal can be changed, and then changed.
DC/DC 变换器的输出电压， 最终可通过调整微扰信号控制生成具有较 为合理频谙特征曲线的输出电压，其中的微扰信号由微扰信号生成器 21 生成。 因此， 本领域技术人员可通过调整微扰信号生成器 21 的相关参 数来改变微扰信号， 通过一系列调整， 最终得到较为合理的输出电压， 减少 DC/DC变换器的电磁干扰现象，使得经电压调制后的 DC/DC变换 器处于较佳的工作状态。 The output voltage of the DC/DC converter can finally be controlled to generate an output voltage having a more reasonable frequency characteristic curve by adjusting the perturbation signal, wherein the perturbation signal is generated by the perturbation signal generator 21. Therefore, those skilled in the art can change the perturbation signal by adjusting the relevant parameters of the perturbation signal generator 21, and finally obtain a reasonable output voltage through a series of adjustments, thereby reducing the electromagnetic interference phenomenon of the DC/DC converter, so that the The voltage-modulated DC/DC converter is in a better operating state.
本发明实施例的 DC/DC 变换器， 通过设置微扰信号生成器生成微 扰信号， 根据微扰信号生成新的开关控制信号， 从而改变 DC/DC 变换 器的输出电压，使 DC/DC变换器输出电压的功率谙特性曲线更为平緩， 减少 DC/DC变换器产生的电磁干扰现象，提高了 DC/DC变换器的电磁 兼容性。  The DC/DC converter of the embodiment of the present invention generates a perturbation signal by setting a perturbation signal generator, generates a new switch control signal according to the perturbation signal, thereby changing an output voltage of the DC/DC converter, and performing DC/DC conversion. The power 谙 characteristic curve of the output voltage of the device is more gradual, reducing the electromagnetic interference phenomenon generated by the DC/DC converter and improving the electromagnetic compatibility of the DC/DC converter.
为了本领域技术人 更好的理解本发明实施例提供的 DC/DC 变换 器的技术方案， 下面通过具体的实施例对本发明提供的 DC/DC 变换器 的工作过程进行详细说明。  For a better understanding of the technical solution of the DC/DC converter provided by the embodiment of the present invention, the working process of the DC/DC converter provided by the present invention will be described in detail below through specific embodiments.
作为本发明的一种具体实施方式， 如图 5所示， 图 5为本发明实施 例 DC/DC变换器的等效电路图。 DC/DC变换器中包括： 开关管 1、 开 关控制电路 2、 输出电路 3和电源 E, 具体地， 电源 E的正极连接于开 关管 1的第一端， 电源 E的负极接地，输出电路 3具体可以包括二极管 D、 电感 L、 电容 C和电阻 R以及第一节点， 其中， 二极管 D的阳极接 地， 二极管 D的阴极连接于开关管 1 的第二端， 电感 L的一端连接于 二极管 D 的阴极另一端连接于第一节点， 电容 C的一端接地， 另一端 连接于第一节点、 电阻 R与电容 C并联， 其中， 第一节点为 DC/DC变 换器的输出端； 开关控制电路 2的结构与上述实施例相同， 开关控制器 24的输出端连接于开关管 1的控制端， 时钟振荡电路 22的一端接地， 时钟振荡电路 22的另一端连接于开关控制器 24的一输入端， 用于提供 时钟振荡电压信号； 微扰信号生成器 21 —端接地， 另一端连接于误差 放大器 23的一信号输入端， 用于提供微扰信号； 误差放大器 23的另一 输入端连接于 DC/DC变换器的输出端，误差放大器 23的输出端连接于 开关控制器 24的另一输入端。 下面结合图 5对本发明实施例的 DC/DC 变换器的工作流程进行一下详细说明。 电源 E作为供电部分对所述 DC/DC变换器进行供电， 开关控制电 路 2生成开关控制信号 u， 通过开关控制信号 u控制开关管 1的导通或 断开。电源 E供给的电能经过开关管 1以及输出电路 3中的一系列电路 元件， 最终在电阻 R与电感 L的连接处即第一节点输出的输出电压。 由此， 在 DC/DC变换器确定的情况下， 改变开关管 1 的工作状态可使 输出电路 3的输出电压发生变化。 为了区分电压调制前后输出电路 3输 出电压， 将未进行电压调制情况下， 输出电路 3的输出电压称为第一电 压 Vl; 将经过电压调制情况下， 输出电路 3 的输出电压称为第二电压 微扰信号生成器 21生成微扰信号 ef 。举例来说， 以正弦波形周期 的微扰信号为例。 假设 Vref = k 8ΐη(2πβ + Θ)+Ϋκί， Vref 为所述微扰信号 生成电路生成的微扰信号， 其中， k 为微扰信号的扰动强度， f 为开关 管的工作频率， Θ为微扰信号的相位参量， ef 为参考电压值。 需要说 明的是， 本领域技术人员可对上述微扰信号中设置的各参数进行调整， 亦或是设置其他形式的微扰信号， 例如： 设置以方波波形为周期的微扰 信号， 从而调整微扰信号。 As a specific embodiment of the present invention, as shown in FIG. 5, FIG. 5 is an equivalent circuit diagram of a DC/DC converter according to an embodiment of the present invention. The DC/DC converter includes: a switch tube 1, a switch control circuit 2, an output circuit 3, and a power source E. Specifically, the anode of the power source E is connected to the first end of the switch tube 1, the cathode of the power source E is grounded, and the output circuit 3 Specifically, the diode D, the inductor L, the capacitor C, and the resistor R and the first node may be included, wherein the anode of the diode D is grounded, the cathode of the diode D is connected to the second end of the switch tube 1, and one end of the inductor L is connected to the diode D. The other end of the cathode is connected to the first node, one end of the capacitor C is grounded, the other end is connected to the first node, and the resistor R is connected in parallel with the capacitor C, wherein the first node is the output end of the DC/DC converter; the switch control circuit 2 The structure is the same as that of the above embodiment, the output end of the switch controller 24 is connected to the control end of the switch tube 1, one end of the clock oscillating circuit 22 is grounded, and the other end of the clock oscillating circuit 22 is connected to an input end of the switch controller 24, Providing a clock oscillating voltage signal; the perturbation signal generator 21 is grounded at one end, and the other end is connected to a signal input end of the error amplifier 23 for providing a perturbation signal; Output terminal of amplifier 23 the other input terminal is connected to a DC / DC converter, the output of the error amplifier 23 is connected to the other input of the switch controller 24. The working flow of the DC/DC converter of the embodiment of the present invention will be described in detail below with reference to FIG. The power source E supplies power to the DC/DC converter as a power supply portion, and the switch control circuit 2 generates a switch control signal u, and the switch control signal u controls the on or off of the switch tube 1. The electric energy supplied from the power source E passes through the switching tube 1 and a series of circuit elements in the output circuit 3, and finally the output voltage of the first node is output at the junction of the resistor R and the inductor L. Thus, in the case where the DC/DC converter is determined, changing the operating state of the switching transistor 1 causes the output voltage of the output circuit 3 to change. In order to distinguish the output voltage of the output circuit 3 before and after the voltage modulation, the output voltage of the output circuit 3 is referred to as the first voltage V1 when no voltage modulation is performed; the output voltage of the output circuit 3 is referred to as the second voltage when the voltage is modulated. The perturbation signal generator 21 generates a perturbation signal ef. For example, a perturbation signal with a sinusoidal waveform period is taken as an example. Suppose V ref = k 8 ΐ η (2πβ + Θ) + Ϋ κί , V ref is the perturbation signal generated by the perturbation signal generating circuit, where k is the perturbation intensity of the perturbation signal, and f is the operating frequency of the switching tube. Θ is the phase parameter of the perturbation signal, and ef is the reference voltage value. It should be noted that those skilled in the art can adjust various parameters set in the above-mentioned perturbation signal, or set other types of perturbation signals, for example, setting a perturbation signal with a square wave waveform as a period, thereby adjusting Perturbation signal.
时钟振荡电路 22生成时钟振荡电压信号。 举例来 ， 以锯齿波周 期的时钟振荡电压信号为例， 假设 ^mmp W V ) (^modl^| , Vramp 为所述时钟振荡电压信号， 其中， 为振荡谷值电压， Vu为振荡峰值 电压， T为时钟振荡电压信号的振荡周期。 需要说明的是， 分析时钟振 荡电压信号可知，所述时钟振荡电压信号的电压值在 V! ~Vu之间呈周期 性的振荡变化。 The clock oscillation circuit 22 generates a clock oscillation voltage signal. For example, taking the clock oscillating voltage signal of the sawtooth period as an example, suppose ^mmp WV ) (^modl^| , Vramp is the clock oscillating voltage signal, where is the oscillating valley voltage, Vu is the oscillating peak voltage, T The oscillation period of the voltage signal is oscillated for the clock. It is to be noted that the analysis of the clock oscillating voltage signal shows that the voltage value of the clock oscillating voltage signal changes periodically between V! and Vu.
误差放大器 23 的一个信号输入端接收第一电压， 另一个信号输入 端与微扰信号生成器 21相连接， 即， 接收第一电压 ^以及上述微扰信 号 Vref 并进行处理。 作为本发明的一种具体实施方式， 如图 5所示， 误 差放大器 23基于差分放大器结构。 第一电压为 Vl , 那么差分放大第一 电压 Vl以及微扰信号 Vref ， 生成的误差电压可表示为 。n = ^ ^ - l ref )，One signal input terminal of the error amplifier 23 receives the first voltage, and the other signal input terminal is connected to the perturbation signal generator 21, that is, receives the first voltage ^ and the above-described perturbation signal V ref and processes it. As a specific embodiment of the present invention, as shown in FIG. 5, the error amplifier 23 is based on a differential amplifier structure. The first voltage is V1 , then the first voltage V1 and the perturbation signal V ref are differentially amplified, and the generated error voltage can be expressed as . n = ^ ^ - l ref ),
A为一常数， 用于调制误差电压的电压强度。 A is a constant used to modulate the voltage strength of the error voltage.
开关控制器 24的一个信号输入端与时钟振荡电路 22相连接， 另一 个信号输入端与误差放大器 23相连接，接收时钟振荡电压 Vramp以及误 差放大器 23生成的误差电压 Vc。n并进行处理。 作为本发明的一种具体 实施方式，开关控制器 24基于差分比较器结构，比较时钟振荡电压 Vramp 以及误差电压 Ve。n 而生成开关控制信号 u。 例如： 当 Vramp < Vc。n时， 开关控制器 24生成低电平 "0" 的开关控制信号 u; 而当 Vramp > Vc。n时， 开关控制器 24生成高电平 " 1 " 的开关控制信号 ^ One signal input terminal of the switch controller 24 is connected to the clock oscillation circuit 22, and the other signal input terminal is connected to the error amplifier 23, and receives the clock oscillation voltage V ramp and the error voltage V c generated by the error amplifier 23. n and process. As a specific embodiment of the present invention In an embodiment, the switch controller 24 compares the clock oscillating voltage V ramp and the error voltage V e based on the differential comparator configuration. n generates a switch control signal u. For example: When V ramp < V c . At n , the switch controller 24 generates a switch control signal u of low level "0"; and when V ramp > V c . When n , the switch controller 24 generates a switch control signal of a high level "1" ^
开关管 1接收开关控制信号 u并根据开关控制信号 u中电平的高低 变化控制转换断开或导通两种工作状态。 因此， 整个 DC/DC 变换器的 工作过程可描述如下， 电源 E 负责供电， 在电阻 R与电感 L的连接处 即第一节点处输出输出电压。 当不进行电压调制情况下， 输出电压 Vl。 而开始电压调制后， 接入微扰信号 Vref, 经一系列计算生成新的开关控 制信号 u并改变控制开关管 1的断开或导通的工作状态。 随着开关管 1 的工作状态的变换， 通过输出电路 3中的一系列电路元件， 最终生成新 的输出电压 v2。 事实上， 上述电压调制过程最终反映了通过微扰信号 Vref调制 DC/DC变换器输出电压的过程， 调制过程将输出电压由 ¥ 周 制成为 v2。 因此， 微扰信号 Vref改变了 DC/DC变换器的输出电压。 通 过对微扰信号 Vref对应参数调整， 生成频谙特征曲线较为理想的输出电 压， 从而可以减少 DC/DC 变换器的电磁干扰现象， 使得经电压调制后 的 DC/DC变换器处于最佳的工作状态。 The switch tube 1 receives the switch control signal u and controls the switching off or on according to the level change of the switch control signal u. Therefore, the operation of the entire DC/DC converter can be described as follows. The power supply E is responsible for supplying power, and the output voltage is output at the junction of the resistor R and the inductor L, that is, the first node. When voltage modulation is not performed, the voltage Vl is output. After the voltage modulation is started, the perturbation signal V ref is input, and a new switch control signal u is generated through a series of calculations and the operation state of controlling the disconnection or conduction of the switch tube 1 is changed. As the operating state of the switching transistor 1 changes, a new output voltage v 2 is finally generated by a series of circuit elements in the output circuit 3. In fact, the above voltage modulation process ultimately reflects the process of modulating the DC/DC converter output voltage through the perturbation signal V ref , which produces the output voltage from ¥ weeks to v 2 . Therefore, the perturbation signal V ref changes the output voltage of the DC/DC converter. By adjusting the parameter corresponding to the perturbation signal V ref , an ideal output voltage of the frequency characteristic curve is generated, thereby reducing the electromagnetic interference phenomenon of the DC/DC converter, so that the voltage-modulated DC/DC converter is optimal. Working status.
本发明实施例的一种 DC/DC变换器， 通过设置微扰信号生成器生 成微扰信号， 根据微扰信号生成新的开关控制信号， 从而改变 DC/DC 变换器的输出电压， 使 DC/DC变换器输出电压的功率谱特性曲线更为 平緩， 减少 DC/DC变换器产生的电磁干扰现象， 提高了 DC/DC变换器 的电磁兼容性。  A DC/DC converter according to an embodiment of the present invention generates a perturbation signal by setting a perturbation signal generator, and generates a new switch control signal according to the perturbation signal, thereby changing an output voltage of the DC/DC converter to make DC/ The power spectrum characteristic curve of the DC converter output voltage is more gradual, reducing the electromagnetic interference phenomenon generated by the DC/DC converter and improving the electromagnetic compatibility of the DC/DC converter.
再一方面， 本发明实施例还提供了一种显示装置， 包括上述实施例 中的 DC/DC变换器， 其中， DC/DC变换器用于接收电源电压， 并进行 电压转换，为所述显示装置的各部分电路提供工作所需电压。举例来说， 栅极驱动器工作所需的模拟电压以及数字电压就是由 DC/DC 变换器进 行转换电压提供的。 DC/DC 变换器电压转换电压从而确保栅极驱动器 正常工作的需要。 因此， 通过使用上述实施例所述的 DC/DC 变换器， 设置微扰信号生成器生成微扰信号， 减少 DC/DC变换器的电磁干扰现 象， 使得经电压调制后的 DC/DC 变换器处于最佳的工作状态， 进而使 得显示装置的电磁兼容性也得到了进一步的提高。 另外， 显示装置其他 部分的结构可以参考现有技术， 对此本文不再详细描述。 In still another aspect, an embodiment of the present invention further provides a display device, including the DC/DC converter in the above embodiment, wherein the DC/DC converter is configured to receive a power supply voltage and perform voltage conversion for the display device. Each part of the circuit provides the voltage required for operation. For example, the analog voltage required for the operation of the gate driver and the digital voltage are provided by the DC/DC converter to convert the voltage. The DC/DC converter voltage is converted to voltage to ensure proper operation of the gate driver. Therefore, by using the DC/DC converter described in the above embodiment, the perturbation signal generator is set to generate a perturbation signal, and the electromagnetic interference phenomenon of the DC/DC converter is reduced, so that the voltage-modulated DC/DC converter is at The optimum working condition, in turn, further improves the electromagnetic compatibility of the display device. In addition, display device other Part of the structure can refer to the prior art, which will not be described in detail herein.
本发明实施例提供的显示装置， 所述显示装置可以为显示器、 平板 电视、 数码相框、 手机、 平板电脑等具有显示功能的产品或者部件， 本 发明不做限制。  The display device provided by the embodiment of the present invention may be a product or a component having a display function, such as a display, a flat panel television, a digital photo frame, a mobile phone, a tablet computer, etc., which is not limited by the present invention.
本发明实施例的一种显示装置， 其中上述显示装置的 DC/DC 变换 器里设置有微扰信号生成器， 使得 DC/DC 变换器输出电压的功率谱特 性曲线更为平緩， 减少 DC/DC 变换器产生的电磁干扰现象， 提高了显 示装置的电磁兼容性。  A display device according to an embodiment of the present invention, wherein a DC/DC converter of the display device is provided with a perturbation signal generator, so that a power spectrum characteristic curve of a DC/DC converter output voltage is more gradual, and DC/DC is reduced. The electromagnetic interference phenomenon generated by the converter improves the electromagnetic compatibility of the display device.
再一方面， 本发明实施例还提供了一种 DC/DC变换器的电压调制 方法。 本实施例电压调制方法， 如图 7所示， 包括以下步骤：  In still another aspect, an embodiment of the present invention further provides a voltage modulation method for a DC/DC converter. The voltage modulation method of this embodiment, as shown in FIG. 7, includes the following steps:
S1 : 生成微扰信号；  S1: generating a perturbation signal;
S2: 根据所述微扰信号， 改变开关控制信号；  S2: changing a switch control signal according to the perturbation signal;
作为本发明的一种实施方式， 该电压调制方法利用了上述实施例提 供的 DC/DC变换器， 如图 3所示， 所述 DC/DC变换器包括： 开关管 1、 开关控制电路 2、 输出电路 3。 开关控制电路 2中设置微扰信号生成器 21 , 微扰信号生成器 21 用于生成微扰信号。 进一步的， 所述微扰信号 的波形为正弦波或者方波。 通过调整微扰信号生成器的相关参数从而达 到调整微扰信号的目的。  As an embodiment of the present invention, the voltage modulation method utilizes the DC/DC converter provided by the above embodiment. As shown in FIG. 3, the DC/DC converter includes: a switch tube 1, a switch control circuit 2, Output circuit 3. A perturbation signal generator 21 is provided in the switch control circuit 2, and the perturbation signal generator 21 is used to generate a perturbation signal. Further, the waveform of the perturbation signal is a sine wave or a square wave. The purpose of adjusting the perturbation signal is achieved by adjusting the relevant parameters of the perturbation signal generator.
DC/DC 变换器的具体结构和原理与上述实施例相同， 在此不再赘 述。  The specific structure and principle of the DC/DC converter are the same as those of the above embodiment, and will not be described herein.
进一步地， 如图 8 所示， 步驟 S2: 根据所述微扰信号， 改变开关 控制信号的过程具体可以包括以下步骤：  Further, as shown in FIG. 8, step S2: according to the perturbation signal, the process of changing the switch control signal may specifically include the following steps:
S21 :差分放大处理所述 DC/DC变换器的输出电压以及所述微扰信 号， 生成误差电压信号；  S21: differentially amplifying the output voltage of the DC/DC converter and the perturbation signal to generate an error voltage signal;
S22: 生成时钟振荡电压信号；  S22: generate a clock oscillating voltage signal;
S23 : 差分比较所述误差电压信号以及所述时钟振荡电压信号以生 成新的开关控制信号。  S23: Differentially comparing the error voltage signal and the clock oscillating voltage signal to generate a new switch control signal.
本发明实施例的一种 DC/DC变换器的电压调制方法， 通过设置生 成微扰信号， 根据微扰信号生成新的开关控制信号， 从而改变 DC/DC 变换器的输出电压， 使 DC/DC 变换器输出电压的功率谱特性曲线更为 平緩， 减少 DC/DC变换器产生的电磁干扰现象， 提高了 DC/DC变换器 的电磁兼容性。 A voltage modulation method for a DC/DC converter according to an embodiment of the present invention generates a new perturbation signal by setting a perturbation signal, thereby changing a DC/DC converter output voltage to make a DC/DC The power spectrum characteristic curve of the converter output voltage is more Smooth, reduce the electromagnetic interference caused by the DC/DC converter, and improve the electromagnetic compatibility of the DC/DC converter.
本说明书中的各个实施例均采用递进的方式描述， 各个实施例之间 相同相似的部分互相参见即可， 每个实施例重点说明的都是与其他实施 例的不同之处。 尤其， 对于方法实施例而言， 由于其基本相似于装置实 施例，所以描述得比较筒单，相关之处参见装置实施例的部分说明即可。  The various embodiments in the specification are described in a progressive manner, and the same or similar parts of the various embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the method embodiment, since it is substantially similar to the device embodiment, it is described in a relatively simple manner, and the relevant portions can be referred to the description of the device embodiment.
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不 局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围 内， 可轻易想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应以所述权利要求的保护范围为准。  The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

权 利 要 求 书 claims
1、 一种 DC/DC变换器， 包括： 开关管； 连接于所述开关管的开关 控制电路， 所述开关控制电路用于生成开关控制信号， 所述开关控制信 号用于控制所述开关管的导通或断开；以及连接于所述开关管的输出电 路，所述输出电路用于根据所述开关管的导通或断开，输出所述 DC/DC 变换器的输出电压， 其中， 1. A DC/DC converter, including: a switch tube; a switch control circuit connected to the switch tube, the switch control circuit is used to generate a switch control signal, and the switch control signal is used to control the switch tube is turned on or off; and an output circuit connected to the switching tube, the output circuit is used to output the output voltage of the DC/DC converter according to the turning on or off of the switching tube, wherein,
所述开关控制电路包括微扰信号生成器，所述微扰信号生成器用于 生成微扰信号， 所述微扰信号用于改变所述开关控制信号， 以使所述输 出电路的输出电压随所述开关控制信号的变化而改变。 The switch control circuit includes a perturbation signal generator, the perturbation signal generator is used to generate a perturbation signal, the perturbation signal is used to change the switch control signal, so that the output voltage of the output circuit changes accordingly. changes due to changes in the switch control signal.
2、 根据权利要求 1所述的 DC/DC变换器， 其中， 所述微扰信号的 波形为正弦波或者方波。 2. The DC/DC converter according to claim 1, wherein the waveform of the perturbation signal is a sine wave or a square wave.
3、 根据权利要求 1所述的 DC/DC变换器， 其中， 所述开关控制电 路还包括： 3. The DC/DC converter according to claim 1, wherein the switch control circuit further includes:
时钟振荡电路， 用于生成时钟振荡电压信号； A clock oscillation circuit used to generate a clock oscillation voltage signal;
误差放大器， 连接于所述输出电路和所述微扰信号生成器之间， 用 于差分放大处理所述输出电路的输出电压以及所述微扰信号，生成误差 电压信号； An error amplifier, connected between the output circuit and the perturbation signal generator, used for differential amplification processing of the output voltage of the output circuit and the perturbation signal to generate an error voltage signal;
开关控制器， 连接于所述误差放大器和所述时钟振荡电路之间， 用 于差分比较所述误差电压信号以及所述时钟振荡电压信号以生成新的 开关控制信号。 A switch controller is connected between the error amplifier and the clock oscillation circuit, and is used for differentially comparing the error voltage signal and the clock oscillation voltage signal to generate a new switch control signal.
4、 根据权利要求 3所述的 DC/DC变换器， 其中， 所述时钟振荡电 压信号的波形为锯齿波。 4. The DC/DC converter according to claim 3, wherein the waveform of the clock oscillation voltage signal is a sawtooth wave.
5、 根据权利要求 1所述的 DC/DC变换器， 其中， 所述输出电路包 括： 二极管、 电感、 电容、 电阻以及第一节点， 其中， 5. The DC/DC converter according to claim 1, wherein the output circuit includes: a diode, an inductor, a capacitor, a resistor and a first node, wherein,
二极管， 其阳极接地， 阴极连接于所述开关管； A diode with its anode connected to ground and its cathode connected to the switch tube;
电感， 其一端连接于所述二极管的阴极， 另一端连接于所述第一节 点； An inductor, one end of which is connected to the cathode of the diode, and the other end is connected to the first node;
电容， 其一端连接于所述第一节点， 另一端接地； 电阻， 其一端连接于所述第一节点， 另一端接地； 以及 A capacitor, one end of which is connected to the first node, and the other end is grounded; A resistor with one end connected to the first node and the other end connected to ground; and
第一节点， 作为所述 DC/DC变换器输出电压的输出端。 The first node serves as the output terminal of the DC/DC converter output voltage.
6、 根据权利要求 5所述的 DC/DC变换器， 其中， 所述开关控制电 路还包括： 时钟振荡电路、 误差放大器及开关控制器； 其中， 6. The DC/DC converter according to claim 5, wherein the switch control circuit further includes: a clock oscillation circuit, an error amplifier and a switch controller; wherein,
该开关控制器的输出端连接于开关管的控制端，该时钟振荡电路的 一端接地， 该时钟振荡电路的另一端连接于开关控制器的一输入端， 用 于提供时钟振荡电压信号； The output end of the switch controller is connected to the control end of the switch tube, one end of the clock oscillation circuit is connected to ground, and the other end of the clock oscillation circuit is connected to an input end of the switch controller for providing a clock oscillation voltage signal;
该微扰信号生成器一端接地，另一端连接于误差放大器的一信号输 入端， 用于提供微扰信号； One end of the perturbation signal generator is grounded, and the other end is connected to a signal input end of the error amplifier for providing a perturbation signal;
该误差放大器的另一输入端连接于 DC/DC变换器的输出端， 误差 放大器的输出端连接于开关控制器的另一输入端。 The other input terminal of the error amplifier is connected to the output terminal of the DC/DC converter, and the output terminal of the error amplifier is connected to the other input terminal of the switching controller.
7、一种显示装置，包括权利要求 1-6任一项所述的 DC/DC变换器。 7. A display device comprising the DC/DC converter according to any one of claims 1 to 6.
8、 一种 DC/DC变换器的电压调制方法， 包括以下步骤： 8. A voltage modulation method for a DC/DC converter, including the following steps:
生成微扰信号； Generate perturbation signals;
根据所述微扰信号， 改变开关控制信号。 According to the perturbation signal, the switch control signal is changed.
9、 根据权利要求 8所述的 DC/DC变换器的电压调制方法， 其中， 所述微扰信号的波形为正弦波或者方波。 9. The voltage modulation method of the DC/DC converter according to claim 8, wherein the waveform of the perturbation signal is a sine wave or a square wave.
10、根据权利要求 8所述的 DC/DC变换器的电压调制方法， 其中， 根据所述微扰信号， 改变开关控制信号的步骤包括： 10. The voltage modulation method of a DC/DC converter according to claim 8, wherein the step of changing the switch control signal according to the perturbation signal includes:
差分放大处理所述 DC/DC变换器的输出电压以及所述微扰信号， 生成误差电压信号； Differential amplification processes the output voltage of the DC/DC converter and the perturbation signal to generate an error voltage signal;
生成时钟振荡电压信号； 以及 generating a clock oscillation voltage signal; and
差分比较所述误差电压信号以及所述时钟振荡电压信号以生成新 的开关控制信号。 The error voltage signal and the clock oscillation voltage signal are differentially compared to generate a new switch control signal.
PCT/CN2013/074274 2013-02-20 2013-04-16 Dc/dc convertor, voltage modulation method and display device WO2014127572A1 (en)

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