CN110121043A - Show power supply unit and display system - Google Patents
Show power supply unit and display system Download PDFInfo
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- CN110121043A CN110121043A CN201910494914.0A CN201910494914A CN110121043A CN 110121043 A CN110121043 A CN 110121043A CN 201910494914 A CN201910494914 A CN 201910494914A CN 110121043 A CN110121043 A CN 110121043A
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- circuit
- power supply
- electrically connected
- voltage
- comparison circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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Abstract
This application provides a kind of display power supply units, including power supply circuit, bleeder circuit, the first comparison circuit, Voltage-Controlled oscillation circuit, the second comparison circuit, switching circuit.Power supply circuit is for providing output voltage.Bleeder circuit is electrically connected with power supply circuit.The first input end of first comparison circuit is electrically connected with the second output terminal of bleeder circuit.Second input terminal of the first comparison circuit is used for input reference voltage.Voltage-Controlled oscillation circuit is electrically connected with the first comparison circuit.Second comparison circuit is electrically connected with the first comparison circuit.Second comparison circuit is electrically connected with Voltage-Controlled oscillation circuit.The first end of switching circuit is electrically connected with the positive output end of power supply circuit.The second end of switching circuit is electrically connected with the output end of the second comparison circuit.The output frequency control switch circuit of output level and Voltage-Controlled oscillation circuit of second comparison circuit based on the first comparison circuit is turned on and off, and is exported with controlling stablizing for output voltage.This application provides a kind of display systems.
Description
Technical field
This application involves electronic technology fields, more particularly to display power supply unit and display system.
Background technique
LCD TV is at present increasingly to large scale, high-res development, therefore the power consumption of LCD TV accordingly increases.And
The substantially general design scheme in the part power supply IC at present, can't have too big difference according to the difference of load, thus
So that the power consumption of LCD TV is bigger, the output of power supply is more unstable, and ripple (ripple) is bigger, in this way to the use of IC,
Display including rear end can all bring adverse effect.
For the power consumption increase because of TV, cause the output of power supply unstable, so that ripple (ripple) is excessive
Problem, traditional way are to realize the pressure stabilizing output of power supply by increasing the electric capacity of voltage regulation of rear end, but will cause capacitor in this way
Quantity is excessive, and the increase of driving board size is also brought while increasing cost.
Summary of the invention
Based on this, it is necessary to for the power consumption increase because of TV, cause the output of power supply unstable, so that ripple mistake
Big problem provides a kind of display power supply unit and display system.
A kind of display power supply unit, comprising:
Power supply circuit, for providing output voltage；
Bleeder circuit, the input terminal of the bleeder circuit are electrically connected with the positive output end of the power supply circuit, the partial pressure
First output end of circuit is electrically connected with the negative output terminal of the power supply circuit, the negative output terminal ground connection of the power supply circuit；
First comparison circuit, the first input end of first comparison circuit and the second output terminal electricity of the bleeder circuit
Second input terminal of connection, first comparison circuit is used for input reference voltage；
Voltage-Controlled oscillation circuit, the input terminal of the Voltage-Controlled oscillation circuit and the output end of first comparison circuit are electrically connected
It connects；
The output end electricity of second comparison circuit, the first input end of second comparison circuit and first comparison circuit
Connection, the second input terminal of second comparison circuit are electrically connected with the output end of the Voltage-Controlled oscillation circuit；
Switching circuit, the first end of the switching circuit are electrically connected with the positive output end of the power supply circuit, the switch
The second end of circuit is electrically connected with the output end of second comparison circuit, the third end ground connection of the switching circuit；And
Output level and the Voltage-Controlled oscillation circuit of second comparison circuit based on first comparison circuit it is defeated
Frequency controls being turned on and off for the switching circuit out, is exported with controlling stablizing for the output voltage.
The bleeder circuit includes: in one of the embodiments,
First resistor, one end of the first resistor are electrically connected with the positive output end of the power supply circuit, first electricity
The other end of resistance is electrically connected with the first input end of first comparison circuit；
Second resistance, one end of the second resistance respectively with one end of the first resistor and first comparison circuit
First input end electrical connection, the second resistance the other end ground connection.
First comparison circuit includes: in one of the embodiments,
First comparator, the reverse input end of the first comparator and the second output terminal of the bleeder circuit are electrically connected
It connects, the positive input of the first comparator is for inputting the reference voltage, the output end difference of the first comparator
It is electrically connected with the first input end of the input terminal of the Voltage-Controlled oscillation circuit and second comparison circuit.
The Voltage-Controlled oscillation circuit includes: in one of the embodiments,
Voltage controlled oscillator, the input terminal of the voltage controlled oscillator are electrically connected with the output end of first comparison circuit, institute
The output end for stating voltage controlled oscillator is electrically connected with the second input terminal of second comparison circuit.
Second comparison circuit includes: in one of the embodiments,
Second comparator, the positive input of second comparator and the output end of first comparison circuit are electrically connected
It connects, the reverse input end of second comparator is electrically connected with the output end of the voltage controlled oscillator, second comparator
Output end is electrically connected with the second end of the switching circuit.
The switching circuit includes: in one of the embodiments,
Switching tube, the first end of the switching tube are electrically connected with the positive output end of the power supply circuit, the switching tube
Second end is electrically connected with the output end of second comparison circuit, the third end ground connection of the switching tube.
The power supply circuit includes: in one of the embodiments,
Power supply, the cathode of the power supply are electrically connected with the first output end of the bleeder circuit respectively；
Inductance, one end of the inductance are electrically connected with the anode of the power supply, the other end of the inductance and the switch
The first end of circuit is electrically connected.
The power supply circuit in one of the embodiments, further include:
The anode of diode, the diode is electrically connected with the other end of the inductance, and the cathode of the diode is institute
State the positive output end of power supply circuit；
Capacitor, one end of the capacitor are electrically connected with the cathode of the diode, the other end of the capacitor and the electricity
The cathode in source is electrically connected.
A kind of display power supply unit, comprising:
Power supply circuit, for providing output voltage；
Bleeder circuit, the input terminal of the bleeder circuit are electrically connected with the positive output end of the power supply circuit, the partial pressure
First output end of circuit is electrically connected with the negative output terminal of the power supply circuit, the negative output terminal ground connection of the power supply circuit；
First comparison circuit, the first input end of first comparison circuit and the second output terminal electricity of the bleeder circuit
Second input terminal of connection, first comparison circuit is used for input reference voltage；
Voltage controlled oscillator, the input terminal of the voltage controlled oscillator are electrically connected with the output end of first comparison circuit；
The output end electricity of second comparison circuit, the first input end of second comparison circuit and first comparison circuit
Connection, the second input terminal of second comparison circuit are electrically connected with the output end of the voltage controlled oscillator；
Switching tube, the first end of the switching tube are electrically connected with the positive output end of the power supply circuit, the switching tube
Second end is electrically connected with the output end of second comparison circuit, the third end ground connection of the switching tube；
Output level and the Voltage-Controlled oscillation circuit of second comparison circuit based on first comparison circuit it is defeated
Frequency controls being turned on and off for the switching tube out, is exported with controlling stablizing for the output voltage.
A kind of display system, including the display power supply unit as described in any of the above-described embodiment；And
Display panel, the display power supply unit are used to power for the display panel.
Compared with prior art, the output voltage is passed through the partial pressure by above-mentioned display power supply unit and display system
Circuit divides it, obtains feedback voltage；Then by first comparison circuit that feedback voltage and the benchmark is electric
Pressure is compared, and comparison result is exported respectively to the Voltage-Controlled oscillation circuit and second comparison circuit, using described
Voltage-Controlled oscillation circuit based on the comparison fructufy when generate different output frequencies, and cooperate with second comparison circuit,
Being turned on and off for the switching circuit is controlled, to realize the output of stablizing of the output voltage, and then it is excessive to solve ripple
The problem of.The application can adjust in real time being turned on and off for the switching circuit based on feedback voltage, to realize based on negative
Load state, output voltage described in adjust automatically achieve the effect that output is stable.
Detailed description of the invention
Fig. 1 is the circuit block diagram for the display power supply unit that one embodiment of the application provides；
Fig. 2 is the circuit diagram for the display power supply unit that one embodiment of the application provides；
Fig. 3 is ripple schematic diagram caused by an existing embodiment；
Fig. 4 is the ripple schematic diagram for the display power supply unit that one embodiment of the application provides；
Fig. 5 is the circuit block diagram for the display system that one embodiment of the application provides.
10 display power supply units
11 display panels
100 power supply circuits
110 power supplys
120 inductance
130 diodes
140 capacitors
20 display systems
200 bleeder circuits
210 first resistors
220 second resistances
300 first comparison circuits
301 reference voltages
310 first comparators
400 Voltage-Controlled oscillation circuits
410 voltage controlled oscillators
500 second comparison circuits
510 second comparators
600 switching circuits
610 switching tubes
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1, one embodiment of the application provides a kind of display power supply unit 10, including power supply circuit 100, partial pressure electricity
Road 200, the first comparison circuit 300, Voltage-Controlled oscillation circuit 400, the second comparison circuit 500, switching circuit 600.The power supply electricity
Road 100 is for providing output voltage.The input terminal of the bleeder circuit 200 and the positive output end of the power supply circuit 100 are electrically connected
It connects.First output end of the bleeder circuit 200 is electrically connected with the negative output terminal of the power supply circuit 100.The power supply circuit
100 negative output terminal ground connection.Second output of the first input end of first comparison circuit 300 and the bleeder circuit 200
End electrical connection.Second input terminal of first comparison circuit 300 is used for input reference voltage 301.The Voltage-Controlled oscillation circuit
400 input terminal is electrically connected with the output end of first comparison circuit 300.
The first input end of second comparison circuit 500 is electrically connected with the output end of first comparison circuit 300.Institute
The second input terminal for stating the second comparison circuit 500 is electrically connected with the output end of the Voltage-Controlled oscillation circuit 400.The switching circuit
600 first end is electrically connected with the positive output end of the power supply circuit 100.The second end of the switching circuit 600 and described the
The output end of two comparison circuits 500 is electrically connected.The third end of the switching circuit 600 is grounded.Second comparison circuit, 500 base
The switch electricity is controlled in the output level of first comparison circuit 300 and the output frequency of the Voltage-Controlled oscillation circuit 400
Road 600 is turned on and off, and is exported with controlling stablizing for the output voltage.
It is appreciated that the particular circuit configurations of the power supply circuit 100 do not do specific restriction, as long as having described in offer
The function of output voltage.The particular circuit configurations of the power supply circuit 100, can be selected according to actual needs.One
In a embodiment, the power supply circuit 100 external inductors can form with battery.In one embodiment, the power supply
Circuit 100 core inductance can also form with dry cell.
It is appreciated that the particular circuit configurations of the bleeder circuit 200 do not do specific restriction, as long as having the function of partial pressure
Energy.The particular circuit configurations of the bleeder circuit 200, can be selected according to actual needs.In one embodiment, institute
Stating bleeder circuit 200 can be composed in series by multiple conventional, electric-resistances.In one embodiment, the bleeder circuit 200 can also be by electricity
Hold and at least two conventional, electric-resistances form.After being divided the output voltage using the bleeder circuit 200, fed back
(FB) voltage.
It is appreciated that the particular circuit configurations of first comparison circuit 300 do not do specific restriction, as long as having institute
It states feedback (FB) voltage to be compared with the reference voltage 301, and exports the function of the first comparison result.Described first
The particular circuit configurations of comparison circuit 300 can be selected according to actual needs.In one embodiment, described first compares
Circuit 300 can be made of operational amplifier and resistance.In one embodiment, first comparison circuit 300 can also be by comparing
Device composition.
Feedback (FB) voltage is compared with the reference voltage 301 using first comparison circuit 300, and
It exports low and high level (i.e. the first comparison result).In one embodiment, if feedback (FB) voltage is greater than the benchmark electricity
Pressure 301, then first comparison circuit 300 exports low level.In one embodiment, if described feedback (FB) voltage be less than or
Equal to the reference voltage 301, then first comparison circuit 300 exports high level.
It is appreciated that the particular circuit configurations of the Voltage-Controlled oscillation circuit 400 do not do specific restriction, it is based on as long as having
Different input voltages exports the function of different frequencies.The particular circuit configurations of the Voltage-Controlled oscillation circuit 400, can root
It is selected according to actual demand.In one embodiment, the Voltage-Controlled oscillation circuit 400 can be built by capacitor, inductance, oscillating tube
Composition.In one embodiment, the Voltage-Controlled oscillation circuit 400 can be made of the first voltage controlled oscillator.Pass through the voltage-controlled vibration
It swings circuit 400 and different clock output frequencies is generated based on the output level of first comparison circuit 300.
It is appreciated that the particular circuit configurations of second comparison circuit 500 do not do specific restriction, as long as having institute
State the defeated of the first output signal (i.e. the first comparison result) and the Voltage-Controlled oscillation circuit 400 of the first comparison circuit 300 output
Signal is compared out, and exports the function of the second comparison result.The physical circuit knot of second comparison circuit 500
Structure can be selected according to actual needs.In one embodiment, second comparison circuit 500 can by operational amplifier and
Resistance composition.In one embodiment, second comparison circuit 500 can also be made of comparator.
The first output signal (i.e. first for being exported first comparison circuit 300 using second comparison circuit 500
Comparison result) it is compared with the output signal of the Voltage-Controlled oscillation circuit 400, and export the second output signal (the i.e. second ratio
Relatively result), being turned on and off for the switching circuit 600 can control by the variation of second output signal.
It is appreciated that the particular circuit configurations of the switching circuit 600 do not do specific restriction, as long as having by described
Second comparison circuit 500 controls the function of 600 on and off of switching circuit.The switching circuit 600 it is specific
Circuit structure can be selected according to actual needs.In one embodiment, the switching circuit 600 can be by field-effect tube group
At.In one embodiment, the switching circuit 600 can also by thyristor groups at.
In one embodiment, if the output voltage of the power supply circuit 100 is relatively low, the feedback voltage is relatively low, institute
The output level for stating the first comparison circuit 300 will become high level from low level；The Voltage-Controlled oscillation circuit 400 is corresponded at this time
The clock frequency of generation can also become larger, and meeting after frequency becomes larger is so that second comparison circuit 500 controls the switching circuit 600
Switching frequency can also become faster, charge/discharge speed will be accelerated, and voltage relatively low in this way can obtain fast quick-recovery, to make
The output for obtaining the output voltage is stablized.
In the present embodiment, the output voltage divides it by the bleeder circuit 200, obtains feedback electricity
Pressure.Then feedback voltage and the reference voltage 301 are compared by first comparison circuit 300, and knot will be compared
Fruit is exported respectively to the Voltage-Controlled oscillation circuit 400 and second comparison circuit 500.Utilize the Voltage-Controlled oscillation circuit 400
Different output frequencies is generated when fructufy based on the comparison, and is cooperated with second comparison circuit 500, is opened described in control
Powered-down road 600 is turned on and off, to realize that stablizing for the output voltage exports, and then solves the problems, such as that ripple is excessive.
The present embodiment can adjust in real time being turned on and off for the switching circuit 600 based on the feedback voltage, be based on to realize
Load condition, output voltage described in adjust automatically, and then achieve the effect that output is stable.
Fig. 2 is referred to, in one embodiment, the bleeder circuit 200 includes first resistor 210, second resistance 220.
One end of the first resistor 210 is electrically connected with the positive output end of the power supply circuit 100.The first resistor 210 it is another
End is electrically connected with the first input end of first comparison circuit 300.One end of the second resistance 220 is respectively with described first
The electrical connection of the first input end of one end of resistance 210 and first comparison circuit 300.The other end of the second resistance 220
Ground connection.
In one embodiment, the electricity of fixed resistance value can be used in the first resistor 210 and/or the second resistance 220
Resistance.It can be by the output voltage using the bleeder circuit 200 that the first resistor 210 and the second resistance 220 form
It is divided, obtains described feedback (FB) voltage.
In one embodiment, first comparison circuit 300 includes first comparator 310.The first comparator 310
Reverse input end be electrically connected with the second output terminal of the bleeder circuit 200, the positive input of the first comparator 310
For inputting the reference voltage 301.The output end of the first comparator 310 respectively with the Voltage-Controlled oscillation circuit 400
The electrical connection of the first input end of input terminal and second comparison circuit 500.
In one embodiment, by the first comparator 310 by the feedback voltage and the reference voltage 301 into
Row compares.If the feedback voltage is greater than the reference voltage 301, the first comparator 310 exports low level.At one
In embodiment, if the feedback voltage is less than or equal to the reference voltage 301, the first comparator 310 exports high electricity
It is flat.It is different using the output level of the first comparator 310, so that the Voltage-Controlled oscillation circuit 400 generates different output
Frequency.
In one embodiment, the Voltage-Controlled oscillation circuit 400 includes voltage controlled oscillator 410.The voltage controlled oscillator 410
Input terminal be electrically connected with the output end of first comparison circuit 300.The output end of the voltage controlled oscillator 410 and described the
Second input terminal of two comparison circuits 500 is electrically connected.First comparison circuit 300 is based on by the voltage controlled oscillator 410
Output level height generate different output frequencies so that the voltage controlled oscillator 410 generate the output frequency
It is to be automatically adjusted based on load condition, to realize the stable effect of the output of the output voltage.
In one embodiment, second comparison circuit 500 includes the second comparator 510.Second comparator 510
Positive input be electrically connected with the output end of first comparison circuit 300.The reverse input end of second comparator 510
It is electrically connected with the output end of the voltage controlled oscillator 410.The output end of second comparator 510 and the switching circuit 600
Second end electrical connection.
In one embodiment, believed using the level that second comparator 510 exports first comparison circuit 300
It number is compared with the output frequency signal of the Voltage-Controlled oscillation circuit 400, and exports the second output signal, pass through described second
The variation of output signal can control being turned on and off for the switching circuit 600.
In one embodiment, the switching circuit 600 includes switching tube 610.The first end of the switching tube 610 and institute
State the positive output end electrical connection of power supply circuit 100.The second end of the switching tube 610 is defeated with second comparison circuit 500
Outlet electrical connection.The third end of the switching tube 610 is grounded.
In one embodiment, the switching tube 610 can be PMOS tube.In one embodiment, the switching tube 610
It is also possible to triode.It is defeated that the control terminal (i.e. first end) of the switching tube 610 receives 500 output end of the second comparison circuit
Control signal (i.e. the second output signal) out, and the movement for disconnecting or closing according to the control signal, thus described in realizing
The output of output voltage is stablized.
In one embodiment, the power supply circuit 100 includes power supply 110, inductance 120.The cathode of the power supply 110 point
It is not electrically connected with the first output end of the bleeder circuit 200.The anode electricity of one end of the inductance 120 and the power supply 110
Connection.The other end of the inductance 120 is electrically connected with the first end of the switching circuit 600.In one embodiment, the electricity
Source 110 can be dry cell or battery.In one embodiment, the inductance 120 can be in the bleeder circuit 200, institute
State the first comparison circuit 300, the Voltage-Controlled oscillation circuit 400, second comparison circuit 500 and the switching circuit 600
Mating reaction under be constantly charged and discharged, to realize the purpose of output voltage stabilization output.
In one embodiment, the power supply circuit 100 further includes diode 130, capacitor 140.The diode 130
The positive other end with the inductance 120 is electrically connected.The cathode of the diode 130 is the positive output of the power supply circuit 100
End.One end of the capacitor 140 is electrically connected with the cathode of the diode 130.The other end and the power supply of the capacitor 140
110 cathode electrical connection.In one embodiment, ensure the stability of the output of power supply 110 simultaneously using the diode 130
Can power supply circuit 100 described in effective protection, improve security performance.In one embodiment, also can using the capacitor 140
Further ensure that the stability of the output voltage of the power supply circuit 100.Pass through the diode 130 and the capacitor 140
Cooperation, may make the stability of the output voltage of the power supply circuit 100 more preferably.
Another embodiment of the application provides a kind of display power supply unit 10, including power supply circuit 100, bleeder circuit 200,
One comparison circuit 300, voltage controlled oscillator 410, the second comparison circuit 500, switching tube 610.The power supply circuit 100 is for providing
Output voltage.The input terminal of the bleeder circuit 200 is electrically connected with the positive output end of the power supply circuit 100.The partial pressure electricity
First output end on road 200 is electrically connected with the negative output terminal of the power supply circuit 100.The negative output terminal of the power supply circuit 100
Ground connection.The first input end of first comparison circuit 300 is electrically connected with the second output terminal of the bleeder circuit 200.It is described
Second input terminal of the first comparison circuit 300 is used for input reference voltage 301.The input terminal of the voltage controlled oscillator 410 and institute
State the output end electrical connection of the first comparison circuit 300.
The first input end of second comparison circuit 500 is electrically connected with the output end of first comparison circuit 300.Institute
The second input terminal for stating the second comparison circuit 500 is electrically connected with the output end of the voltage controlled oscillator 410.The switching tube 610
First end be electrically connected with the positive output end of the power supply circuit 100.The second end of the switching tube 610 is compared with described second
The output end of circuit 500 is electrically connected.The third end of the switching tube 610 is grounded.Second comparison circuit 500 is based on described the
The output level of one comparison circuit 300 and the output frequency of the Voltage-Controlled oscillation circuit 400 control the conducting of the switching tube 610
And closing, it is exported with controlling stablizing for the output voltage.
The application when in use, when the output voltage (Vo) is excessive, by the first resistor 210 and described second
The bleeder circuit 200 that resistance 220 forms, the feedback (FB) voltage obtained after voltage division processing are also corresponding excessive.This
Feedback voltage described in Shi Ruo is greater than the reference voltage (Vref) 301, then what the output end of the first comparator 310 exported
First output signal is then low level.At the same time, the output frequency of the voltage controlled oscillator 410 just becomes smaller, after frequency becomes smaller
The switching speed for controlling the switching tube 610 also can be slack-off, i.e., the time that the described inductance 120 charges can become smaller, so that institute
Output voltage (Vo) decline is stated, and then realization can quickly hold Vo voltage, lessen the ripple (ripple) of voltage.
Specifically, when first output signal is greater than the output signal of the voltage controlled oscillator 410, described the
Second output signal of two comparators 510 output is high level, then the switching tube 610 can be connected under the action of high level,
So that the inductance 120 charges.Opposite, when first output signal is less than the signal of the voltage controlled oscillator 410 output
When, the second output signal that second comparator 510 exports is low level, then the switching tube 610 is low level
It will disconnect under effect, the inductance 120 discharges at this time, because the time that the inductance 120 discharges is longer than the inductance 120 and charges
Time, then known to the output voltage will slowly reduce, so that Vo voltage can be held by realizing, and then lessen voltage
Ripple (ripple).
Conversely, taking out high current suddenly in backend load, cause the output voltage relatively low, then FB voltage also can be relatively low,
The first output signal of the output end output of the first comparator 310 is then high level at this time, then the corresponding voltage-controlled vibration
The clock frequency for swinging the generation of device 410 can also become larger, and frequency finally controls the switching tube 610 switching frequency after becoming larger can also become
Fastly, charge/discharge speed will be accelerated, and the output voltage relatively low in this way can obtain fast quick-recovery, so that realizing can be steady
Firmly Vo voltage, reduces the ripple (ripple) of voltage, while can reduce electromagnetic radiation.
In one embodiment, Ts weeks fixed as shown in figure 3, for ripple (ripple) schematic diagram caused by existing scheme
In the case where phase, △ V can be larger.And after the scheme for using the application to can be changed dynamic frequency, within the shorter Ts ' time, ripple
(ripple) it responds faster due to having obtained power supply and becomes smaller (as shown in Figure 4).
In conclusion the application divides the output voltage by the bleeder circuit 200 to it, fed back
Voltage；Then feedback voltage and the reference voltage 301 are compared by first comparison circuit 300, and will compared
As a result it exports respectively to the Voltage-Controlled oscillation circuit 400 and second comparison circuit 500；Utilize the Voltage-Controlled oscillation circuit
400 based on the comparison fructufy when generate different output frequencies, and cooperate with second comparison circuit 500, control institute
Being turned on and off for switching circuit 600 is stated, to realize the output of stablizing of the output voltage, and then solves that ripple is excessive asks
Topic.The application can adjust in real time being turned on and off for the switching circuit 600 based on the feedback voltage, be based on to realize
Load condition, output voltage described in adjust automatically, and then achieve the effect that output is stable.
Fig. 5 is referred to, one embodiment of the application provides a kind of display system 20, including described in any of the above-described embodiment
Show power supply unit 10 and display panel 11.The display power supply unit 10 is used to power for the display panel 11.It utilizes
The display power supply unit 10 can adjust in real time being turned on and off for the switching circuit 600 based on the feedback voltage, from
And the display system 20 is enabled to be based on load condition, output voltage described in adjust automatically, and then it is stable to reach output
Effect.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of display power supply unit characterized by comprising
Power supply circuit, for providing output voltage；
Bleeder circuit, the input terminal of the bleeder circuit are electrically connected with the positive output end of the power supply circuit, the bleeder circuit
The first output end be electrically connected with the negative output terminal of the power supply circuit, the negative output terminal of power supply circuit ground connection；
The second output terminal of first comparison circuit, the first input end and the bleeder circuit of first comparison circuit is electrically connected
It connects, the second input terminal of first comparison circuit is used for input reference voltage；
Voltage-Controlled oscillation circuit, the input terminal of the Voltage-Controlled oscillation circuit are electrically connected with the output end of first comparison circuit；
Second comparison circuit, the first input end of second comparison circuit and the output end of first comparison circuit are electrically connected
It connects, the second input terminal of second comparison circuit is electrically connected with the output end of the Voltage-Controlled oscillation circuit；
Switching circuit, the first end of the switching circuit are electrically connected with the positive output end of the power supply circuit, the switching circuit
Second end be electrically connected with the output end of second comparison circuit, the third end of switching circuit ground connection；And
The output frequency of output level and the Voltage-Controlled oscillation circuit of second comparison circuit based on first comparison circuit
Rate controls being turned on and off for the switching circuit, is exported with controlling stablizing for the output voltage.
2. display power supply unit as described in claim 1, which is characterized in that the bleeder circuit includes:
First resistor, one end of the first resistor are electrically connected with the positive output end of the power supply circuit, the first resistor
The other end is electrically connected with the first input end of first comparison circuit；
Second resistance, one end of the second resistance respectively with one end of the first resistor and first comparison circuit
The electrical connection of one input terminal, the other end ground connection of the second resistance.
3. display power supply unit as described in claim 1, which is characterized in that first comparison circuit includes:
First comparator, the reverse input end of the first comparator are electrically connected with the second output terminal of the bleeder circuit, institute
The positive input of first comparator is stated for inputting the reference voltage, the output end of the first comparator respectively with it is described
The electrical connection of the first input end of the input terminal of Voltage-Controlled oscillation circuit and second comparison circuit.
4. display power supply unit as described in claim 1, which is characterized in that the Voltage-Controlled oscillation circuit includes:
Voltage controlled oscillator, the input terminal of the voltage controlled oscillator are electrically connected with the output end of first comparison circuit, the pressure
The output end of control oscillator is electrically connected with the second input terminal of second comparison circuit.
5. display power supply unit as claimed in claim 4, which is characterized in that second comparison circuit includes:
Second comparator, the positive input of second comparator are electrically connected with the output end of first comparison circuit, institute
The reverse input end for stating the second comparator is electrically connected with the output end of the voltage controlled oscillator, the output end of second comparator
It is electrically connected with the second end of the switching circuit.
6. display power supply unit as described in claim 1, which is characterized in that the switching circuit includes:
Switching tube, the first end of the switching tube are electrically connected with the positive output end of the power supply circuit, and the second of the switching tube
End is electrically connected with the output end of second comparison circuit, the third end ground connection of the switching tube.
7. display power supply unit as described in claim 1, which is characterized in that the power supply circuit includes:
Power supply, the cathode of the power supply are electrically connected with the first output end of the bleeder circuit respectively；
Inductance, one end of the inductance are electrically connected with the anode of the power supply, the other end of the inductance and the switching circuit
First end electrical connection.
8. display power supply unit as claimed in claim 7, which is characterized in that the power supply circuit further include:
The anode of diode, the diode is electrically connected with the other end of the inductance, and the cathode of the diode is the confession
The positive output end of circuit；
Capacitor, one end of the capacitor are electrically connected with the cathode of the diode, the other end of the capacitor and the power supply
Cathode electrical connection.
9. a kind of display power supply unit characterized by comprising
Power supply circuit, for providing output voltage；
Bleeder circuit, the input terminal of the bleeder circuit are electrically connected with the positive output end of the power supply circuit, the bleeder circuit
The first output end be electrically connected with the negative output terminal of the power supply circuit, the negative output terminal of power supply circuit ground connection；
The second output terminal of first comparison circuit, the first input end and the bleeder circuit of first comparison circuit is electrically connected
It connects, the second input terminal of first comparison circuit is used for input reference voltage；
Voltage controlled oscillator, the input terminal of the voltage controlled oscillator are electrically connected with the output end of first comparison circuit；
Second comparison circuit, the first input end of second comparison circuit and the output end of first comparison circuit are electrically connected
It connects, the second input terminal of second comparison circuit is electrically connected with the output end of the voltage controlled oscillator；
Switching tube, the first end of the switching tube are electrically connected with the positive output end of the power supply circuit, and the second of the switching tube
End is electrically connected with the output end of second comparison circuit, the third end ground connection of the switching tube；
The output frequency of output level and the Voltage-Controlled oscillation circuit of second comparison circuit based on first comparison circuit
Rate controls being turned on and off for the switching tube, is exported with controlling stablizing for the output voltage.
10. a kind of display system, which is characterized in that including the described in any item display power supply units of such as claim 1-9；And
Display panel, the display power supply unit are used to power for the display panel.
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| CN201910494914.0A CN110121043B (en) | 2019-06-10 | 2019-06-10 | Display power supply device and display system |
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| CN201910494914.0A CN110121043B (en) | 2019-06-10 | 2019-06-10 | Display power supply device and display system |
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| CN110121043B (en) | 2022-04-15 |
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