CN103151915A - Direct current (DC)/DC convertor, voltage modulating method and display device - Google Patents
Direct current (DC)/DC convertor, voltage modulating method and display device Download PDFInfo
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- CN103151915A CN103151915A CN201310054650XA CN201310054650A CN103151915A CN 103151915 A CN103151915 A CN 103151915A CN 201310054650X A CN201310054650X A CN 201310054650XA CN 201310054650 A CN201310054650 A CN 201310054650A CN 103151915 A CN103151915 A CN 103151915A
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- 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
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- 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
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- 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
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- 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
Abstract
The embodiment of the invention discloses a direct current (DC)/DC convertor, a voltage modulating method and a display device which relate to the field of switching power supply, an electromagnetic interference phenomenon which is generated when the DC/DC converter is at switching frequency and higher harmonic can be reduced, and the electromagnetic compatibility of the display device is improved. The DC/DC converter disclosed by the embodiment comprises a switching tube, a switching control circuit and an output circuit, wherein the switching control circuit is connected with the switching tube and used for generating switching control signals, and the switching control signals are used for controlling the connection or disconnection of the switching tube; the output circuit is connected with the switching tube and outputs the output voltage of the DC/DC converter according to the connection or disconnection of the switching tube; and the switching control circuit comprises an infinitesimal disturbance signal generator, wherein the infinitesimal disturbance signal generator is used for generating infinitesimal disturbance signals, the infinitesimal disturbance signals are used for changing the switching control signals, so that the output voltage of the output circuit changes along with the variation of the switching control signals.
Description
Technical field
The present invention relates to field of switch power, relate in particular to a kind of dcdc converter, voltage modulated method and display unit.
Background technology
Development along with science and technology, LCD (English: Liquid Crystal Display, liquid crystal display), PDP (English: Plasma Display Panel Chinese:, plasma display panel), OLED (English: Organic Light-Emitting Diode Chinese:, Organic Light Emitting Diode) etc. Chinese: Display Technique reaches its maturity, and increasing display unit is well known and be widely used in daily life field.For instance, take display unit shown in Figure 1 as example, this display unit comprises: the construction units such as display floater, power supply, gamma maker, time schedule controller, gate drivers, data driver, dcdc converter.Wherein, time schedule controller is used for generating according to the synchronizing signal of input the control signal of control gate driver and data driver; The gamma maker is used for generating the gray scale voltage signal of determination data gray level information; Gate drivers is used for the unlatching of control display panel grid line or closes; Data driver is used for data message is input to display floater.And as the important component part in display unit, DCDC (English: Direct Current, Chinese: direct current) converter is used for the power supply form is changed, and the power supply after changing offers the each several part circuit of display unit, to satisfy each circuit unit assembly requirements of one's work.
The key of dcdc converter converting power source form is the switching tube that it comprises.Switching tube is a kind of power device of based semiconductor construction of switch.By quick disconnection or two kinds of operating states of conducting of control switch pipe, thereby be another kind of power supply form with a kind of power supply Morphological Transitions and offer required circuit unit.Dcdc converter not only can changing voltage, can also conversion frequency.
But the inventor finds that in R﹠D process there is following defective at least in prior art: along with the raising of display unit internal circuit unit block complexity, the power supply form that dcdc converter will provide also becomes more complicated.As shown in Figure 2, Fig. 2 is the spectrogram of display unit dcdc converter output voltage when not carrying out voltage modulated.Can find from Fig. 2, along with the action of switching tube high-speed switch, dcdc converter can produce obvious electromagnetic interference phenomenon when switching frequency and high order harmonic component place.The electromagnetic interference phenomenon that produces is understood the electromagnetic environment of pollution display device inside, affects the Electro Magnetic Compatibility of other unit block.
Summary of the invention
Embodiments of the invention technical problem to be solved is to provide a kind of dcdc converter, voltage modulated method and display unit, can reduce the electromagnetic interference phenomenon that dcdc converter produces when switching frequency and high order harmonic component place, improve the Electro Magnetic Compatibility of display unit.
The application's one side, a kind of dcdc converter is provided, comprise: switching tube, be connected in the ON-OFF control circuit of described switching tube, described ON-OFF control circuit is used for generating switch controlling signal, and described switch controlling signal is used for controlling conducting or the disconnection of described switching tube, be connected in the output circuit of described switching tube, described output circuit is used for conducting or the disconnection according to described switching tube, the output voltage of the described dcdc converter of output
Described ON-OFF control circuit comprises the perturbation signal generator, described perturbation signal generator is used for generating the perturbation signal, described perturbation signal is used for changing described switch controlling signal, so that the output voltage of described output circuit changes with the variation of described switch controlling signal.
Further, the waveform of described perturbation signal is sine wave or square wave.
Further, described ON-OFF control circuit also comprises:
Clock oscillation circuit is used for generated clock oscillating voltage signal;
Be connected in the error amplifier of described output circuit and described perturbation signal generator, be used for output voltage and described perturbation signal that differential amplification is processed described output circuit, the generated error voltage signal;
Be connected in the on-off controller of described error amplifier and described clock oscillation circuit, be used for the described error voltage signal of differential comparison and described clock oscillation voltage signal to generate new switch controlling signal.
Further, the waveform of described clock oscillation voltage signal is sawtooth waveforms.
Preferably, described output circuit comprises: diode, inductance, electric capacity, resistance and first node, wherein,
Diode, its plus earth, negative electrode is connected in described switching tube;
Inductance, the one end is connected in the negative electrode of described diode, and the other end is connected in described first node;
Electric capacity, the one end is connected in described first node, other end ground connection;
Resistance, the one end is connected in described first node, other end ground connection;
First node is the output of described dcdc converter output voltage.
Described ON-OFF control circuit comprises: perturbation signal generator, clock oscillation circuit, error amplifier and on-off controller; The output of this on-off controller is connected in the control end of switching tube, an end ground connection of this clock oscillator, and the other end of this clock oscillator is connected in an input of on-off controller, is used for providing the clock oscillation voltage signal; This perturbation signal generator one end ground connection, the other end is connected in a signal input part of error amplifier, is used for providing the perturbation signal; Another input of this error amplifier is connected in the output of dcdc converter, and the output of error amplifier is connected in another input of on-off controller.
The application's one side again provides a kind of display unit, comprises dcdc converter described above.
The application more on the one hand, a kind of voltage modulated method of dcdc converter is provided, comprising:
Generate the perturbation signal;
According to described perturbation signal, change switch controlling signal.
Further, the waveform of described perturbation signal is sine wave or square wave.
Further, described according to described perturbation signal, change switch controlling signal and comprise:
Differential amplification is processed output voltage and the described perturbation signal of described dcdc converter, generated error voltage signal;
Generated clock oscillating voltage signal;
The described error voltage signal of differential comparison and described clock oscillation voltage signal are to generate new switch controlling signal.
A kind of dcdc converter of the embodiment of the present invention, voltage modulated method and display unit, by being set, the perturbation signal generator generates the perturbation signal, generate new switch controlling signal according to the perturbation signal, thereby change the output voltage of dcdc converter, make the power spectrum characteristic curve of dcdc converter output voltage become more mild, reduce the electromagnetic interference phenomenon that dcdc converter produces when switching frequency and high order harmonic component place, improved the Electro Magnetic Compatibility of display unit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structured flowchart of prior art display unit;
Fig. 2 is the spectrum signature curve of dcdc converter output voltage when not carrying out voltage modulated;
Fig. 3 is one of structured flowchart of dcdc converter in the embodiment of the present invention;
Fig. 4 be dcdc converter in the embodiment of the present invention structured flowchart two;
Fig. 5 is the equivalent circuit diagram of dcdc converter in the embodiment of the present invention;
Fig. 6 be in the embodiment of the present invention before the dcdc converter voltage modulated with voltage modulated after the spectrum signature curve of output voltage;
Fig. 7 is one of schematic flow sheet of voltage modulated method in the embodiment of the present invention;
Fig. 8 be voltage modulated method in the embodiment of the present invention schematic flow sheet two.
Embodiment
The embodiment of the present invention provides a kind of dcdc converter, voltage modulated method and display unit, can reduce the electromagnetic interference phenomenon that dcdc converter produces when switching frequency and high order harmonic component place, has improved the Electro Magnetic Compatibility of display unit.
In below describing, in order to illustrate rather than in order limiting, to have proposed the detail such as particular system structure, interface, technology, understand the present invention in order to thoroughly cut.Yet, not it will be clear to one skilled in the art that in there is no other embodiment of these details and can realize the present invention yet.In other situation, omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details hinders description of the invention.
The embodiment of the present invention provides a kind of dcdc converter, and as shown in Figure 3, this dcdc converter comprises: switching tube 1, ON-OFF control circuit 2, output circuit 3.Wherein, thus switching tube 1 conducting or the quick variation that disconnects operating state generate the dcdc converter output voltage.When switching tube 1 is in off-state, the circuitry cuts of dcdc converter; When switching tube 1 was in conducting state, the circuit of dcdc converter was connected.ON-OFF control circuit 2 is connected with switching tube 1, generates switch controlling signal, is used for the variation of control switch pipe 1 operating state.Output circuit 3 is connected with switching tube 1, is used for the output voltage of output dc/dc converter.
In fact, do not carrying out in the voltage modulated situation, the output voltage of output circuit 3 exists the electromagnetic interference phenomenon.For example, as shown in Figure 6, the spectrum signature curve of dcdc converter output voltage when in Fig. 6, solid line represents not carry out voltage modulated.Can observe, the spectrum signature curve of dcdc converter output voltage has comprised a lot " spike " and " depression ".And the electromagnetic interference phenomenon that to be dcdc converter exist in switching frequency and high order harmonic component place thereof of these " spikes " and " depression " reaction.If reduce the electromagnetic interference phenomenon of dcdc converter, will manage to be reduced in the power that these " spikes " and " depression " locate output voltage, more level and smooth from the output voltage spectrum signature curve distribution that namely will make dcdc converter at the spectrum signature curve.
Therefore, as shown in Figure 3, perturbation signal generator 21 is set in ON-OFF control circuit 2, perturbation signal generator 21 is used for generating the perturbation signal, utilizes the perturbation signal to change switch controlling signal, so that the output voltage of output circuit 3 is along with change.Further, the waveform of perturbation signal can be any one in sine wave or square wave or other common voltage waveform.
As a kind of embodiment of the present invention, for instance, as shown in Figure 4, ON-OFF control circuit 2 comprises perturbation signal generator 21, clock oscillation circuit 22, error amplifier 23, on-off controller 24.Wherein, perturbation signal generator 21 is used for generating the perturbation signal.Clock oscillation circuit 22, generated clock oscillating voltage signal, clock oscillation voltage signal are used for providing a reference frequency in the process of perturbation signal change switch controlling signal as reference signal.Further, the waveform of described clock oscillation voltage signal can be sawtooth waveforms.
Then, as shown in Figure 4, a signal input part of error amplifier 23 receives the output voltage of above-mentioned output circuit 3, and another signal input part is connected with perturbation signal generator 21.23 pairs of output voltages of error amplifier and perturbation signal carry out differential amplification to be processed, the generated error voltage signal.Need to prove, in the process of processing the generated error voltage signal, the perturbation signal can make the frequency spectrum of output voltage be expanded as the interference source signal, thereby reaches the purpose that the spectrum signature curve that makes output voltage becomes comparatively mild.
Then, as shown in Figure 4, a signal input part of on-off controller 24 is connected with the output of clock oscillation circuit 22, and another signal input part is connected with the output of error amplifier 23.On-off controller 24 receive clock oscillating voltage signals and error voltage signal also carry out differential comparison and process, to generate new switch controlling signal.
Then, as shown in Figure 4, the output of on-off controller 24 is connected with switching tube 1, and switching tube 1 receives and generates new switch controlling signal, and according to switch controlling signal, the output voltage of output circuit is modulated, thereby makes new output voltage.
Need to prove, switching tube 1 is as a kind of power device of based semiconductor construction of switch, and its operating state has conducting or disconnects two kinds.Therefore, the signal that switch controlling signal comprises two states is the conducting of corresponding switching tube or two kinds of operating states of disconnection respectively, for instance, utilize high or low two kinds of operating states distinguishing corresponding switching tube of signal level in switch controlling signal, the "off" operating state of the corresponding switching tube of the low level in switch controlling signal " 0 ", the high level " 1 " in switch controlling signal be " conducting " operating state of corresponding switching tube.Certainly, those skilled in the art should be understood that above-mentioned description to the switch controlled mode only for more clearly describing the present embodiment, and switch controlling signal is the work of control switch pipe by other means also, does not do restriction at this.
In addition, switch controlling signal is by clock oscillation voltage signal and the treated generation of error voltage signal.Concrete processing procedure, for instance, the size of on-off controller 24 comparison clock oscillating voltage signals and both signal voltage values of error voltage signal, when the magnitude of voltage of described clock oscillation voltage signal during higher than the magnitude of voltage of described error voltage signal, the corresponding switch controlling signal that generates high level is controlled the actuating switch pipe this moment; Otherwise the low level switch controlling signal of corresponding generation, control the cut-off switch pipe this moment.
In addition, need to prove, for the output voltage of dcdc converter output circuit 3 after voltage modulated, because the perturbation signal has generated new switch controlling signal, make the operating state of switching tube 1 that change at random occur within the specific limits, will originally be distributed in energy spread on switching frequency and high order harmonic component on the frequency band of wider continuously smooth thus.As shown in Figure 6, in Fig. 6, dotted line represents through after the voltage modulated process, the spectrum signature curve of the output voltage of dcdc converter output circuit 3.Can find after comparative observation, after the voltage modulated process, the spectrum signature curve of output voltage becomes comparatively mild.Therefore, the perturbation signal generator is set, utilizes the perturbation signal to generate new switch controlling signal, output voltage is modulated, make the electromagnetic interference phenomenon of dcdc converter improve, thereby reach the effect that reduces the dcdc converter electromagnetic interference.
Also have a bit of particular note, perturbation signal generator 21 is set generates the perturbation signal, can change newly-generated switch controlling signal by changing the perturbation signal, and then the output voltage of change dcdc converter, finally can generate the output voltage with comparatively reasonable spectrum signature curve by adjusting the perturbation signal controlling.Perturbation signal is wherein generated by perturbation signal generator 21, therefore, those skilled in the art can change the perturbation signal by the relevant parameter of adjusting perturbation signal generator 21, by a series of adjustment, finally obtain comparatively reasonably output voltage, reduce the electromagnetic interference phenomenon of dcdc converter, make the dcdc converter after voltage modulated be in better operating state.
A kind of dcdc converter of the embodiment of the present invention, by being set, the perturbation signal generator generates the perturbation signal, generate new switch controlling signal according to the perturbation signal, thereby change the output voltage of dcdc converter, make the power spectrum characteristic curve of dcdc converter output voltage more mild, reduce the electromagnetic interference phenomenon that dcdc converter produces, improved the Electro Magnetic Compatibility of dcdc converter.
Better understand the technical scheme of the dcdc converter that the embodiment of the present invention provides for those skilled in the art, be elaborated below by the course of work of specific embodiment to dcdc converter provided by the invention.
As a kind of embodiment of the present invention, as shown in Figure 5, Fig. 5 is the equivalent circuit diagram of embodiment of the present invention dcdc converter.dcdc converter comprises: switching tube 1, ON-OFF control circuit 2, output circuit 3 and power supply E, particularly, the positive pole of power supply E is connected in the first end of switching tube 1, the minus earth of power supply E, output circuit 3 specifically can comprise diode D, inductance L, capacitor C and resistance R and first node, wherein, the plus earth of diode D, the negative electrode of diode D is connected in the second end of switching tube 1, the negative electrode other end that one end of inductance L is connected in diode D is connected in first node, one end ground connection of capacitor C, the other end is connected in first node, resistance R is in parallel with capacitor C, wherein, first node is the output of dcdc converter, the structure of ON-OFF control circuit 2 is same as the previously described embodiments, the output of on-off controller 24 is connected in the control end of switching tube 1, one end ground connection of clock oscillator 22, the other end of clock oscillator 22 is connected in an input of on-off controller 24, is used for providing the clock oscillation voltage signal, perturbation signal generator 21 1 end ground connection, the other end is connected in a signal input part of error amplifier 23, is used for providing the perturbation signal, another input of error amplifier 23 is connected in the output of dcdc converter, and the output of error amplifier 23 is connected in another input of on-off controller 24.Below in conjunction with Fig. 5, the workflow of the dcdc converter of the embodiment of the present invention is once described in detail.
Power supply E powers to described dcdc converter as power pack, and ON-OFF control circuit 2 generates switch controlling signal u, by conducting or the disconnection of switch controlling signal u control switch pipe 1.The electric energy that power supply E supplies with through a series of circuit elements in switching tube 1 and output circuit 3, is finally the output voltage of first node output in the junction of resistance R and inductance L.Thus, in the situation that dcdc converter is definite, the operating state that changes switching tube 1 can make the output voltage of output circuit 3 change.In order to distinguish output circuit 3 output voltages before and after voltage modulated, will not carry out in the voltage modulated situation, the output voltage of output circuit 3 is called the first voltage v
1Will be through in the voltage modulated situation, the output voltage of output circuit 3 is called second voltage v
2
At first, perturbation signal generator 21 generates perturbation signal V
refFor instance, take the perturbation signal in sinusoidal waveform cycle as example.Suppose
V
refBe the perturbation signal that described perturbation signal generating circuit generates, wherein, k is the strength of turbulence of perturbation signal, and f is the operating frequency of switching tube, and θ is the Phase Parameter of perturbation signal,
Be reference voltage level.Need to prove, those skilled in the art can adjust each parameter that arranges in above-mentioned perturbation signal, also or other forms of perturbation signal is set, and for example: the perturbation signal take square-wave waveform as the cycle is set, thereby adjusts the perturbation signal.
Then, clock oscillation circuit 22 generated clock oscillating voltage signals.For instance, take the clock oscillation voltage signal of sawtooth period as example, suppose
V
RampBe described clock oscillation voltage signal, wherein, V
LBe vibration valley point voltage, V
UBe oscillation peak voltage, T is the cycle of oscillation of clock oscillation voltage signal.Need to prove, analyze the clock oscillation voltage signal as can be known, the magnitude of voltage of described clock oscillation voltage signal is at V
L～V
UBetween be periodic change in oscillation.
Then, a signal input part of error amplifier 23 receives the first voltage, and another signal input part is connected with perturbation signal generator 21, receives the first voltage v
1And above-mentioned perturbation signal V
refAnd process.As a kind of embodiment of the present invention, as shown in Figure 5, error amplifier 23 is based on the differential amplifier structure.The first voltage is v
1, differential amplification the first voltage v so
1And perturbation signal V
ref, the error voltage of generation can be expressed as V
con=A (v
1-V
ref), A is a constant, is used for the voltage strength of modulation error voltage.
Then, a signal input part of on-off controller 24 is connected with clock oscillation circuit 22, and another signal input part is connected with error amplifier 23, receive clock oscillating voltage V
RampAnd the error voltage V of error amplifier 23 generations
conAnd process.As a kind of embodiment of the present invention, on-off controller 24 is based on the differential comparator structure, comparison clock oscillating voltage V
RampAnd error voltage V
conThereby generate switch controlling signal u.For example: work as V
Ramp＜V
conThe time, on-off controller 24 generates the switch controlling signal u of low level " 0 "; And work as V
Ramp＞V
conThe time, on-off controller 24 generates the switch controlling signal u of high level " 1 ".
Then, switching tube 1 receiving key control signal u and change according to the height of level in switch controlling signal u and control conversion and disconnect or two kinds of operating states of conducting.Therefore, the course of work of whole dcdc converter can be described below, and power supply E is responsible for power supply, is the output voltage of first node output in the junction of resistance R and inductance L.When not carrying out in the voltage modulated situation, output voltage v
1And after the beginning voltage modulated, access perturbation signal V
ref, generate new switch controlling signal u and change the operating state of disconnection or the conducting of control switch pipe 1 through series of computation.Conversion along with the operating state of switching tube 1 by a series of circuit elements in output circuit 3, finally generates new output voltage v
2In fact, above-mentioned voltage modulated process has finally reflected by perturbation signal V
refThe process of modulation dcdc converter output voltage, modulated process with output voltage by v
1Be modulated into for v
2Therefore, perturbation signal V
refChanged the output voltage of dcdc converter.By to perturbation signal V
refCorresponding parameter adjustment generates the comparatively desirable output voltage of spectrum signature curve, thereby can reduce the electromagnetic interference phenomenon of dcdc converter, makes the dcdc converter after voltage modulated be in best operating state.
A kind of dcdc converter of the embodiment of the present invention, by being set, the perturbation signal generator generates the perturbation signal, generate new switch controlling signal according to the perturbation signal, thereby change the output voltage of DCDC converter, make the power spectrum characteristic curve of dcdc converter output voltage more mild, reduce the electromagnetic interference phenomenon that dcdc converter produces, improved the Electro Magnetic Compatibility of dcdc converter.
On the one hand, the embodiment of the present invention also provides a kind of display unit, comprises the dcdc converter in above-described embodiment again, wherein, dcdc converter be used for to receive supply voltage, and carries out voltage transitions, for the each several part circuit of described display unit provides the work required voltage.For instance, the required aanalogvoltage of gate drivers work and digital voltage carry out changing voltage by dcdc converter provides.Thereby dcdc converter voltage transitions voltage is guaranteed the needs of gate drivers normal operation.Therefore, by using the described dcdc converter of above-described embodiment, the perturbation signal generator is set generates the perturbation signal, reduce the electromagnetic interference phenomenon of dcdc converter, make the dcdc converter after voltage modulated be in best operating state, and then make the Electro Magnetic Compatibility of display unit also obtain further raising.In addition, the structure of other parts of display unit can with reference to prior art, be not described in detail this this paper.
The display unit that the embodiment of the present invention provides, described display unit can have product or the parts of Presentation Function for display, panel TV, DPF, mobile phone, panel computer etc., and the present invention does not limit.
A kind of display unit of the embodiment of the present invention, wherein be provided with the perturbation signal generator in the dcdc converter of above-mentioned display unit, make the power spectrum characteristic curve of dcdc converter output voltage more mild, reduce the electromagnetic interference phenomenon that dcdc converter produces, improved the Electro Magnetic Compatibility of display unit.
On the one hand, the embodiment of the present invention also provides a kind of voltage modulated method of dcdc converter again.The present embodiment voltage modulated method as shown in Figure 7, comprises the following steps:
S1: generate the perturbation signal;
S2: according to described perturbation signal, change switch controlling signal;
As one embodiment of the present invention, the dcdc converter that this voltage modulated method has utilized above-described embodiment to provide, as shown in Figure 2, described dcdc converter comprises: switching tube 1, ON-OFF control circuit 2, output circuit 3.Perturbation signal generator 21 is set in ON-OFF control circuit 2, and perturbation signal generator 21 is used for generating the perturbation signal.Further, the waveform of described perturbation signal is sine wave or square wave.Thereby reach the purpose of adjusting the perturbation signal by the relevant parameter of adjusting the perturbation signal generator.
Concrete structure and the principle of dcdc converter are same as the previously described embodiments, do not repeat them here.
Further, as shown in Figure 8, step S2: according to described perturbation signal, the process that changes switch controlling signal specifically can comprise the following steps:
S21: differential amplification is processed output voltage and the described perturbation signal of described dcdc converter, generated error voltage signal;
S22: generated clock oscillating voltage signal;
S23: the described error voltage signal of differential comparison and described clock oscillation voltage signal are to generate new switch controlling signal.
The voltage modulated method of a kind of dcdc converter of the embodiment of the present invention, generate the perturbation signal by arranging, generate new switch controlling signal according to the perturbation signal, thereby change the output voltage of dcdc converter, make the power spectrum characteristic curve of dcdc converter output voltage more mild, reduce the electromagnetic interference phenomenon that dcdc converter produces, improved the Electro Magnetic Compatibility of dcdc converter.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and between each embodiment, identical similar part is mutually referring to getting final product, and each embodiment stresses is difference with other embodiment.Especially, for embodiment of the method, substantially similar in appearance to device embodiment, so describe fairly simplely, relevant part gets final product referring to the part explanation of device embodiment due to it.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. dcdc converter, comprise: switching tube, be connected in the ON-OFF control circuit of described switching tube, described ON-OFF control circuit is used for generating switch controlling signal, and described switch controlling signal is used for controlling conducting or the disconnection of described switching tube, is connected in the output circuit of described switching tube, described output circuit is used for conducting or the disconnection according to described switching tube, export the output voltage of described dcdc converter, it is characterized in that
Described ON-OFF control circuit comprises the perturbation signal generator, described perturbation signal generator is used for generating the perturbation signal, described perturbation signal is used for changing described switch controlling signal, so that the output voltage of described output circuit changes with the variation of described switch controlling signal.
2. dcdc converter according to claim 1, is characterized in that, the waveform of described perturbation signal is sine wave or square wave.
3. dcdc converter according to claim 1, is characterized in that, described ON-OFF control circuit also comprises:
Clock oscillation circuit is used for generated clock oscillating voltage signal;
Be connected in the error amplifier of described output circuit and described perturbation signal generator, be used for output voltage and described perturbation signal that differential amplification is processed described output circuit, the generated error voltage signal;
Be connected in the on-off controller of described error amplifier and described clock oscillation circuit, be used for the described error voltage signal of differential comparison and described clock oscillation voltage signal to generate new switch controlling signal.
4. dcdc converter according to claim 3, is characterized in that, the waveform of described clock oscillation voltage signal is sawtooth waveforms.
5. dcdc converter according to claim 1, is characterized in that, described output circuit comprises: diode, inductance, electric capacity, resistance and first node, wherein,
Diode, its plus earth, negative electrode is connected in described switching tube;
Inductance, the one end is connected in the negative electrode of described diode, and the other end is connected in described first node;
Electric capacity, the one end is connected in described first node, other end ground connection;
Resistance, the one end is connected in described first node, other end ground connection;
First node is the output of described dcdc converter output voltage.
6. dcdc converter according to claim 5, is characterized in that, described ON-OFF control circuit comprises: perturbation signal generator, clock oscillation circuit, error amplifier and on-off controller;
The output of this on-off controller is connected in the control end of switching tube, an end ground connection of this clock oscillator, and the other end of this clock oscillator is connected in an input of on-off controller, is used for providing the clock oscillation voltage signal;
This perturbation signal generator one end ground connection, the other end is connected in a signal input part of error amplifier, is used for providing the perturbation signal;
Another input of this error amplifier is connected in the output of dcdc converter, and the output of error amplifier is connected in another input of on-off controller.
7. a display unit, is characterized in that, comprises the described dcdc converter of claim 1-6 any one.
8. the voltage modulated method of a dcdc converter, is characterized in that, comprising:
Generate the perturbation signal;
According to described perturbation signal, change switch controlling signal.
9. the voltage modulated method of dcdc converter according to claim 8, is characterized in that, the waveform of described perturbation signal is sine wave or square wave.
10. the voltage modulated method of dcdc converter according to claim 8, is characterized in that, and is described according to described perturbation signal, changes switch controlling signal and comprises:
Differential amplification is processed output voltage and the described perturbation signal of described dcdc converter, generated error voltage signal;
Generated clock oscillating voltage signal;
The described error voltage signal of differential comparison and described clock oscillation voltage signal are to generate new switch controlling signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310054650XA CN103151915A (en) | 2013-02-20 | 2013-02-20 | Direct current (DC)/DC convertor, voltage modulating method and display device |
| PCT/CN2013/074274 WO2014127572A1 (en) | 2013-02-20 | 2013-04-16 | Dc/dc convertor, voltage modulation method and display device |
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| CN201310054650XA CN103151915A (en) | 2013-02-20 | 2013-02-20 | Direct current (DC)/DC convertor, voltage modulating method and display device |
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| CN (1) | CN103151915A (en) |
| WO (1) | WO2014127572A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810172A (en) * | 2016-05-31 | 2016-07-27 | 京东方科技集团股份有限公司 | Display driving circuit and display device |
| CN106330146A (en) * | 2016-08-10 | 2017-01-11 | 上海交通大学 | Carrier generation circuit for pulse frequency modulation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889658A (en) * | 2006-06-01 | 2007-01-03 | 南京Lg同创彩色显示系统有限责任公司 | Compensation loop for eliminating switch frequency change to generate electromagnetic interference phenomenon |
| US20110095740A1 (en) * | 2008-04-02 | 2011-04-28 | Ibuki Mori | Switching regulator |
| US20120243264A1 (en) * | 2011-03-24 | 2012-09-27 | Hitachi, Ltd. | Power Supply Device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060039172A1 (en) * | 2004-08-23 | 2006-02-23 | International Rectifier Corporation | Circuit to improve capacitor hold-up time in a converter circuit |
| CN101227147B (en) * | 2008-02-19 | 2011-09-14 | 北京中星微电子有限公司 | Direct current switch power supply control circuit |
-
2013
- 2013-02-20 CN CN201310054650XA patent/CN103151915A/en active Pending
- 2013-04-16 WO PCT/CN2013/074274 patent/WO2014127572A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889658A (en) * | 2006-06-01 | 2007-01-03 | 南京Lg同创彩色显示系统有限责任公司 | Compensation loop for eliminating switch frequency change to generate electromagnetic interference phenomenon |
| US20110095740A1 (en) * | 2008-04-02 | 2011-04-28 | Ibuki Mori | Switching regulator |
| US20120243264A1 (en) * | 2011-03-24 | 2012-09-27 | Hitachi, Ltd. | Power Supply Device |
Non-Patent Citations (1)
| Title |
|---|
| 陈信怀: "移相全桥零电压开关变换器中的非线性现象及其控制", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810172A (en) * | 2016-05-31 | 2016-07-27 | 京东方科技集团股份有限公司 | Display driving circuit and display device |
| CN106330146A (en) * | 2016-08-10 | 2017-01-11 | 上海交通大学 | Carrier generation circuit for pulse frequency modulation |
| CN106330146B (en) * | 2016-08-10 | 2019-08-09 | 上海交通大学 | Carrier generating circuit for pulse frequency modulated |
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| WO2014127572A1 (en) | 2014-08-28 |
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