CN110121043B - Display power supply device and display system - Google Patents
Display power supply device and display system Download PDFInfo
- Publication number
- CN110121043B CN110121043B CN201910494914.0A CN201910494914A CN110121043B CN 110121043 B CN110121043 B CN 110121043B CN 201910494914 A CN201910494914 A CN 201910494914A CN 110121043 B CN110121043 B CN 110121043B
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- voltage
- electrically connected
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application provides a display power supply device, which comprises a power supply circuit, a voltage division circuit, a first comparison circuit, a voltage-controlled oscillation circuit, a second comparison circuit and a switch circuit. The power supply circuit is used for providing an output voltage. The voltage division circuit is electrically connected with the power supply circuit. The first input end of the first comparison circuit is electrically connected with the second output end of the voltage division circuit. The second input end of the first comparison circuit is used for inputting a reference voltage. The voltage-controlled oscillating circuit is electrically connected with the first comparison circuit. The second comparison circuit is electrically connected with the first comparison circuit. The second comparison circuit is electrically connected with the voltage-controlled oscillation circuit. The first end of the switch circuit is electrically connected with the positive output end of the power supply circuit. The second end of the switch circuit is electrically connected with the output end of the second comparison circuit. The second comparison circuit controls the on and off of the switch circuit based on the output level of the first comparison circuit and the output frequency of the voltage-controlled oscillation circuit to control the stable output of the output voltage. The present application provides a display system.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a display power supply device and a display system.
Background
At present, the lcd tv is increasingly developed to have a large size and a high resolution, so that the power consumption of the lcd tv is correspondingly increased. However, the power IC part is a general design scheme at present, and there is not much difference according to the difference of the load, so that the larger the power consumption of the lcd tv is, the more unstable the output of the power supply is, and the larger the ripple (ripple) is, which may have adverse effect on the use of the IC, including the display at the back end.
In order to solve the problem that the output of a power supply is unstable due to the increase of the power consumption of a television, and further, ripple (ripple) is too large, the conventional method is to implement voltage-stabilized output of the power supply by increasing a voltage-stabilized capacitor at the rear end, but the number of capacitors is too large, so that the cost is increased, and the size of a driving board is increased.
Disclosure of Invention
Accordingly, it is necessary to provide a display power supply device and a display system, which solve the problem that the output of a power supply is unstable due to the increase of power consumption of a television and a ripple is excessive.
A display power supply apparatus comprising:
a power supply circuit for providing an output voltage;
the input end of the voltage division circuit is electrically connected with the positive output end of the power supply circuit, the first output end of the voltage division circuit is electrically connected with the negative output end of the power supply circuit, and the negative output end of the power supply circuit is grounded;
a first input end of the first comparison circuit is electrically connected with a second output end of the voltage division circuit, and a second input end of the first comparison circuit is used for inputting a reference voltage;
the input end of the voltage-controlled oscillation circuit is electrically connected with the output end of the first comparison circuit;
a first input end of the second comparison circuit is electrically connected with an output end of the first comparison circuit, and a second input end of the second comparison circuit is electrically connected with an output end of the voltage-controlled oscillation circuit;
a first end of the switching circuit is electrically connected with a positive output end of the power supply circuit, a second end of the switching circuit is electrically connected with an output end of the second comparison circuit, and a third end of the switching circuit is grounded; and
the second comparison circuit controls the switch circuit to be turned on and off based on the output level of the first comparison circuit and the output frequency of the voltage-controlled oscillation circuit to control the stable output of the output voltage.
In one embodiment, the voltage divider circuit includes:
one end of the first resistor is electrically connected with the positive output end of the power supply circuit, and the other end of the first resistor is electrically connected with the first input end of the first comparison circuit;
and one end of the second resistor is electrically connected with one end of the first resistor and the first input end of the first comparison circuit respectively, and the other end of the second resistor is grounded.
In one embodiment, the first comparison circuit includes:
and the reverse input end of the first comparator is electrically connected with the second output end of the voltage division circuit, the forward input end of the first comparator is used for inputting the reference voltage, and the output end of the first comparator is respectively electrically connected with the input end of the voltage-controlled oscillation circuit and the first input end of the second comparator.
In one embodiment, the voltage controlled oscillation circuit includes:
the input end of the voltage-controlled oscillator is electrically connected with the output end of the first comparison circuit, and the output end of the voltage-controlled oscillator is electrically connected with the second input end of the second comparison circuit.
In one embodiment, the second comparison circuit comprises:
and a positive input end of the second comparator is electrically connected with the output end of the first comparison circuit, a negative input end of the second comparator is electrically connected with the output end of the voltage-controlled oscillator, and an output end of the second comparator is electrically connected with the second end of the switch circuit.
In one embodiment, the switching circuit includes:
and the first end of the switch tube is electrically connected with the positive output end of the power supply circuit, the second end of the switch tube is electrically connected with the output end of the second comparison circuit, and the third end of the switch tube is grounded.
In one embodiment, the power supply circuit includes:
the negative electrode of the power supply is electrically connected with the first output end of the voltage division circuit respectively;
and one end of the inductor is electrically connected with the positive electrode of the power supply, and the other end of the inductor is electrically connected with the first end of the switch circuit.
In one embodiment, the power supply circuit further includes:
the anode of the diode is electrically connected with the other end of the inductor, and the cathode of the diode is the positive output end of the power supply circuit;
and one end of the capacitor is electrically connected with the cathode of the diode, and the other end of the capacitor is electrically connected with the cathode of the power supply.
A display power supply apparatus comprising:
a power supply circuit for providing an output voltage;
the input end of the voltage division circuit is electrically connected with the positive output end of the power supply circuit, the first output end of the voltage division circuit is electrically connected with the negative output end of the power supply circuit, and the negative output end of the power supply circuit is grounded;
a first input end of the first comparison circuit is electrically connected with a second output end of the voltage division circuit, and a second input end of the first comparison circuit is used for inputting a reference voltage;
the input end of the voltage-controlled oscillator is electrically connected with the output end of the first comparison circuit;
a second comparison circuit, a first input terminal of the second comparison circuit being electrically connected to an output terminal of the first comparison circuit, a second input terminal of the second comparison circuit being electrically connected to an output terminal of the voltage-controlled oscillator;
a first end of the switching tube is electrically connected with a positive output end of the power supply circuit, a second end of the switching tube is electrically connected with an output end of the second comparison circuit, and a third end of the switching tube is grounded;
the second comparison circuit controls the switch tube to be switched on and off based on the output level of the first comparison circuit and the output frequency of the voltage-controlled oscillation circuit so as to control the stable output of the output voltage.
A display system comprising a display power supply as described in any one of the above embodiments; and
and the display power supply device is used for supplying power to the display panel.
Compared with the prior art, the display power supply device and the display system divide the output voltage through the voltage dividing circuit to obtain the feedback voltage; and then comparing the feedback voltage with the reference voltage through the first comparison circuit, and outputting comparison results to the voltage-controlled oscillation circuit and the second comparison circuit respectively, and controlling the on and off of the switch circuit by utilizing the voltage-controlled oscillation circuit to generate different output frequencies in real time based on the comparison results and matching with the second comparison circuit, thereby realizing the stable output of the output voltage and further solving the problem of overlarge ripple waves. According to the switching circuit, the switching circuit can be adjusted in real time based on the feedback voltage, so that the output voltage is automatically adjusted based on the load state, and the effect of stable output is achieved.
Drawings
Fig. 1 is a circuit block diagram of a display power supply apparatus according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a display power supply apparatus according to an embodiment of the present disclosure;
FIG. 3 is a diagram illustrating ripples caused by a conventional embodiment;
fig. 4 is a schematic diagram of ripples of a display power supply apparatus according to an embodiment of the present disclosure;
fig. 5 is a circuit block diagram of a display system according to an embodiment of the present application.
10 display power supply device
11 display panel
100 power supply circuit
110 power supply
120 inductance
130 diode
140 capacitor
20 display system
200 voltage dividing circuit
210 first resistance
220 second resistance
300 first comparison circuit
301 reference voltage
310 first comparator
400 voltage controlled oscillating circuit
410 voltage controlled oscillator
500 second comparator circuit
510 second comparator
600 switching circuit
610 switching tube
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a display power supply apparatus 10, which includes a power supply circuit 100, a voltage dividing circuit 200, a first comparison circuit 300, a voltage-controlled oscillation circuit 400, a second comparison circuit 500, and a switch circuit 600. The power supply circuit 100 is used to provide an output voltage. The input terminal of the voltage divider circuit 200 is electrically connected to the positive output terminal of the power supply circuit 100. A first output terminal of the voltage divider circuit 200 is electrically connected to a negative output terminal of the power supply circuit 100. The negative output of the power supply circuit 100 is connected to ground. A first input terminal of the first comparison circuit 300 is electrically connected to a second output terminal of the voltage dividing circuit 200. A second input of the first comparison circuit 300 is used for inputting a reference voltage 301. An input terminal of the voltage-controlled oscillation circuit 400 is electrically connected to an output terminal of the first comparison circuit 300.
A first input terminal of the second comparing circuit 500 is electrically connected to an output terminal of the first comparing circuit 300. A second input terminal of the second comparing circuit 500 is electrically connected to the output terminal of the voltage-controlled oscillating circuit 400. A first terminal of the switching circuit 600 is electrically connected to a positive output terminal of the power supply circuit 100. A second terminal of the switch circuit 600 is electrically connected to an output terminal of the second comparator circuit 500. The third terminal of the switching circuit 600 is grounded. The second comparison circuit 500 controls the switching circuit 600 to be turned on and off based on the output level of the first comparison circuit 300 and the output frequency of the voltage-controlled oscillation circuit 400 to control the stable output of the output voltage.
It is understood that the specific circuit structure of the power supply circuit 100 is not particularly limited as long as the power supply circuit has a function of supplying the output voltage. The specific circuit structure of the power supply circuit 100 can be selected according to actual requirements. In one embodiment, the power supply circuit 100 may be composed of a battery in combination with an external inductor. In one embodiment, the power supply circuit 100 may also be comprised of a dry cell battery coupled magnetic core inductor.
It is understood that the specific circuit structure of the voltage divider circuit 200 is not particularly limited as long as the voltage divider circuit has a voltage dividing function. The specific circuit structure of the voltage divider circuit 200 can be selected according to actual requirements. In one embodiment, the voltage divider circuit 200 may be composed of a plurality of common resistors connected in series. In one embodiment, the voltage divider circuit 200 may also be composed of a capacitor and at least two common resistors. The voltage dividing circuit 200 is utilized to divide the output voltage to obtain a Feedback (FB) voltage.
It is understood that the specific circuit structure of the first comparison circuit 300 is not particularly limited as long as it has a function of comparing the Feedback (FB) voltage with the reference voltage 301 and outputting a first comparison result. The specific circuit structure of the first comparison circuit 300 can be selected according to actual requirements. In one embodiment, the first comparison circuit 300 may be composed of an operational amplifier and a resistor. In one embodiment, the first comparison circuit 300 may also be composed of a comparator.
The Feedback (FB) voltage is compared with the reference voltage 301 by the first comparison circuit 300, and a high-low level (i.e., a first comparison result) is output. In one embodiment, if the Feedback (FB) voltage is greater than the reference voltage 301, the first comparison circuit 300 outputs a low level. In one embodiment, if the Feedback (FB) voltage is less than or equal to the reference voltage 301, the first comparison circuit 300 outputs a high level.
It is to be understood that the specific circuit structure of the voltage-controlled oscillation circuit 400 is not particularly limited as long as it has a function of outputting different frequencies based on different input voltages. The specific circuit structure of the voltage-controlled oscillation circuit 400 can be selected according to actual requirements. In one embodiment, the voltage-controlled oscillation circuit 400 may be constructed by a capacitor, an inductor, and an oscillation tube. In one embodiment, the voltage controlled oscillation circuit 400 may be comprised of a first voltage controlled oscillator. Different clock output frequencies are generated by the voltage controlled oscillation circuit 400 based on the output level of the first comparison circuit 300.
It is to be understood that the specific circuit structure of the second comparison circuit 500 is not particularly limited, as long as the second comparison circuit has a function of comparing the first output signal (i.e., the first comparison result) output by the first comparison circuit 300 with the output signal of the voltage-controlled oscillation circuit 400 and outputting the second comparison result. The specific circuit structure of the second comparing circuit 500 can be selected according to actual requirements. In one embodiment, the second comparison circuit 500 may be composed of an operational amplifier and a resistor. In one embodiment, the second comparing circuit 500 may also be composed of a comparator.
The second comparison circuit 500 is used to compare the first output signal (i.e., the first comparison result) output by the first comparison circuit 300 with the output signal of the voltage-controlled oscillation circuit 400, and output a second output signal (i.e., the second comparison result), and the second output signal is varied to control the on/off of the switch circuit 600.
It is understood that the specific circuit structure of the switch circuit 600 is not particularly limited as long as the switch circuit 600 has a function of controlling the second comparator circuit 500 to be turned on or off. The specific circuit structure of the switch circuit 600 can be selected according to actual requirements. In one embodiment, the switching circuit 600 may be comprised of a field effect transistor. In one embodiment, the switching circuit 600 may also be comprised of thyristors.
In one embodiment, if the output voltage of the power supply circuit 100 is low, the feedback voltage is low, and the output level of the first comparison circuit 300 changes from low level to high level; at this time, the clock frequency generated by the voltage-controlled oscillation circuit 400 also becomes higher, and the switching frequency of the switching circuit 600 controlled by the second comparison circuit 500 also becomes higher after the frequency becomes higher, so that the charging and discharging speed is increased, and thus the lower voltage can be quickly recovered, so that the output of the output voltage is stable.
In this embodiment, the output voltage is divided by the voltage dividing circuit 200 to obtain a feedback voltage. Then, the feedback voltage and the reference voltage 301 are compared by the first comparison circuit 300, and the comparison result is output to the vco circuit 400 and the second comparison circuit 500, respectively. The voltage-controlled oscillation circuit 400 is used for generating different output frequencies in real time based on the comparison result, and is matched with the second comparison circuit 500 to control the on and off of the switch circuit 600, so that the stable output of the output voltage is realized, and the problem of overlarge ripple waves is solved. The switching circuit 600 can be adjusted to be switched on and off in real time based on the feedback voltage, so that the output voltage can be automatically adjusted based on the load state, and the effect of stable output is achieved.
Referring to fig. 2, in an embodiment, the voltage divider circuit 200 includes a first resistor 210 and a second resistor 220. One end of the first resistor 210 is electrically connected to the positive output terminal of the power supply circuit 100. The other end of the first resistor 210 is electrically connected to a first input terminal of the first comparison circuit 300. One end of the second resistor 220 is electrically connected to one end of the first resistor 210 and a first input terminal of the first comparison circuit 300, respectively. The other end of the second resistor 220 is grounded.
In one embodiment, the first resistor 210 and/or the second resistor 220 may be resistors with fixed resistance values. The voltage dividing circuit 200 formed by the first resistor 210 and the second resistor 220 can divide the output voltage to obtain the Feedback (FB) voltage.
In one embodiment, the first comparison circuit 300 includes a first comparator 310. An inverting input terminal of the first comparator 310 is electrically connected to the second output terminal of the voltage divider circuit 200, and a positive input terminal of the first comparator 310 is used for inputting the reference voltage 301. The output terminal of the first comparator 310 is electrically connected to the input terminal of the voltage-controlled oscillation circuit 400 and the first input terminal of the second comparator 500, respectively.
In one embodiment, the feedback voltage is compared to the reference voltage 301 by the first comparator 310. If the feedback voltage is greater than the reference voltage 301, the first comparator 310 outputs a low level. In one embodiment, if the feedback voltage is less than or equal to the reference voltage 301, the first comparator 310 outputs a high level. The output levels of the first comparators 310 are different, so that the voltage-controlled oscillation circuit 400 generates different output frequencies.
In one embodiment, the voltage controlled oscillation circuit 400 includes a voltage controlled oscillator 410. An input terminal of the voltage-controlled oscillator 410 is electrically connected to an output terminal of the first comparison circuit 300. An output of the voltage controlled oscillator 410 is electrically connected to a second input of the second comparison circuit 500. Different output frequencies are generated by the voltage-controlled oscillator 410 based on the output level of the first comparison circuit 300, so that the output frequency generated by the voltage-controlled oscillator 410 is automatically adjusted based on the load state, and the effect of stabilizing the output of the output voltage is achieved.
In one embodiment, the second comparison circuit 500 includes a second comparator 510. A positive input terminal of the second comparator 510 is electrically connected to an output terminal of the first comparator circuit 300. The inverting input of the second comparator 510 is electrically connected to the output of the voltage controlled oscillator 410. An output terminal of the second comparator 510 is electrically connected to a second terminal of the switching circuit 600.
In one embodiment, the level signal output by the first comparator circuit 300 is compared with the output frequency signal of the voltage-controlled oscillation circuit 400 by the second comparator 510, and a second output signal is output, and the on and off of the switch circuit 600 can be controlled by the change of the second output signal.
In one embodiment, the switching circuit 600 includes a switching tube 610. A first end of the switching tube 610 is electrically connected to a positive output end of the power supply circuit 100. A second terminal of the switching tube 610 is electrically connected to an output terminal of the second comparing circuit 500. The third terminal of the switch tube 610 is grounded.
In one embodiment, the switch tube 610 may be a PMOS tube. In one embodiment, the switch tube 610 may also be a triode. The control end (i.e., the first end) of the switching tube 610 receives the control signal (i.e., the second output signal) output by the output end of the second comparing circuit 500, and performs a turn-off or turn-off operation according to the control signal, thereby realizing the output stability of the output voltage.
In one embodiment, the power supply circuit 100 includes a power source 110 and an inductor 120. The negative electrodes of the power sources 110 are electrically connected to the first output terminals of the voltage dividing circuit 200, respectively. One end of the inductor 120 is electrically connected to the positive electrode of the power supply 110. The other end of the inductor 120 is electrically connected to the first end of the switch circuit 600. In one embodiment, the power source 110 may be a dry cell or a battery. In one embodiment, the inductor 120 can be continuously charged and discharged under the cooperation of the voltage dividing circuit 200, the first comparing circuit 300, the voltage-controlled oscillating circuit 400, the second comparing circuit 500 and the switching circuit 600, so as to achieve the purpose of outputting the output voltage stably.
In one embodiment, the power supply circuit 100 further includes a diode 130 and a capacitor 140. The anode of the diode 130 is electrically connected to the other end of the inductor 120. The cathode of the diode 130 is the positive output terminal of the power supply circuit 100. One end of the capacitor 140 is electrically connected to the cathode of the diode 130. The other end of the capacitor 140 is electrically connected to the negative electrode of the power supply 110. In one embodiment, the diode 130 is used to ensure the stability of the output of the power supply 110 and to effectively protect the power supply circuit 100, thereby improving the safety performance. In one embodiment, the stability of the output voltage of the power supply circuit 100 can be further ensured by using the capacitor 140. Through the cooperation of the diode 130 and the capacitor 140, the stability of the output voltage of the power supply circuit 100 can be better.
Another embodiment of the present application provides a display power supply apparatus 10, which includes a power supply circuit 100, a voltage dividing circuit 200, a first comparing circuit 300, a voltage controlled oscillator 410, a second comparing circuit 500, and a switching tube 610. The power supply circuit 100 is used to provide an output voltage. The input terminal of the voltage divider circuit 200 is electrically connected to the positive output terminal of the power supply circuit 100. A first output terminal of the voltage divider circuit 200 is electrically connected to a negative output terminal of the power supply circuit 100. The negative output of the power supply circuit 100 is connected to ground. A first input terminal of the first comparison circuit 300 is electrically connected to a second output terminal of the voltage dividing circuit 200. A second input of the first comparison circuit 300 is used for inputting a reference voltage 301. An input terminal of the voltage-controlled oscillator 410 is electrically connected to an output terminal of the first comparison circuit 300.
A first input terminal of the second comparing circuit 500 is electrically connected to an output terminal of the first comparing circuit 300. A second input of the second comparing circuit 500 is electrically connected to the output of the voltage controlled oscillator 410. A first end of the switching tube 610 is electrically connected to a positive output end of the power supply circuit 100. A second terminal of the switching tube 610 is electrically connected to an output terminal of the second comparing circuit 500. The third terminal of the switch tube 610 is grounded. The second comparison circuit 500 controls the switching tube 610 to be turned on and off based on the output level of the first comparison circuit 300 and the output frequency of the voltage-controlled oscillation circuit 400, so as to control the stable output of the output voltage.
When the feedback voltage divider is used, when the output voltage (Vo) is too large, the feedback voltage (FB) obtained after voltage division processing is correspondingly too large through the voltage divider circuit 200 consisting of the first resistor 210 and the second resistor 220. At this time, if the feedback voltage is greater than the reference voltage (Vref)301, the first output signal output by the output terminal of the first comparator 310 is at a low level. Meanwhile, the output frequency of the voltage-controlled oscillator 410 is decreased, and the switching speed for controlling the switching tube 610 is also decreased after the frequency is decreased, that is, the charging time of the inductor 120 is decreased, so that the output voltage (Vo) is decreased, the Vo voltage can be stabilized quickly, and the ripple (ripple) of the voltage is reduced.
Specifically, when the first output signal is greater than the output signal of the vco 410, the second output signal output by the second comparator 510 is at a high level, and the switching tube 610 is turned on under the action of the high level, so that the inductor 120 is charged. On the contrary, when the first output signal is smaller than the signal output by the vco 410, and the second output signal output by the second comparator 510 is at a low level, the switching tube 610 is turned off under the action of the low level, and at this time, the inductor 120 discharges, because the discharging time of the inductor 120 is longer than the charging time of the inductor 120, it is known that the output voltage is gradually reduced, so that the Vo voltage is stabilized, and the ripple (ripple) of the voltage is reduced.
On the contrary, a large current is suddenly pumped by the back-end load, which causes the output voltage to be relatively low, then the FB voltage is also relatively low, at this time, the first output signal output by the output end of the first comparator 310 is at a high level, and then the corresponding clock frequency generated by the voltage-controlled oscillator 410 is also increased, and after the frequency is increased, the switching frequency of the switching tube 610 is finally controlled to be increased, so that the charging and discharging speed is increased, and thus the output voltage which is relatively low can be quickly recovered, thereby realizing that the Vo voltage can be stabilized, reducing the ripple (ripple) of the voltage, and simultaneously reducing the electromagnetic radiation.
In one embodiment, as shown in fig. 3, for the ripple (ripple) diagram of the conventional scheme, Δ V is larger for a fixed Ts period. With the variable frequency scheme of the present invention, the ripple (ripple) becomes smaller in the shorter Ts' time due to the faster response of the power supply (as shown in fig. 4).
In summary, the present application divides the output voltage by the voltage dividing circuit 200 to obtain a feedback voltage; then, the first comparison circuit 300 compares the feedback voltage with the reference voltage 301, and outputs the comparison result to the voltage-controlled oscillation circuit 400 and the second comparison circuit 500; the voltage-controlled oscillation circuit 400 is used for generating different output frequencies in real time based on the comparison result, and is matched with the second comparison circuit 500 to control the on and off of the switch circuit 600, so that the stable output of the output voltage is realized, and the problem of overlarge ripple waves is solved. This application can be based on feedback voltage adjusts in real time switching on and off of switch circuit 600 to the realization is based on load condition, the automatic adjustment output voltage, and then reaches the stable effect of output.
Referring to fig. 5, an embodiment of the present application provides a display system 20, which includes the display power supply apparatus 10 and the display panel 11 according to any one of the embodiments. The display power supply device 10 is used for supplying power to the display panel 11. The display power supply device 10 can adjust the on and off of the switch circuit 600 in real time based on the feedback voltage, so that the display system 20 can automatically adjust the output voltage based on the load state, and further achieve the effect of stable output.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A display power supply apparatus, comprising:
a power supply circuit for providing an output voltage;
the input end of the voltage division circuit is electrically connected with the positive output end of the power supply circuit, the first output end of the voltage division circuit is electrically connected with the negative output end of the power supply circuit, and the negative output end of the power supply circuit is grounded;
a first input end of the first comparison circuit is electrically connected with a second output end of the voltage division circuit, and a second input end of the first comparison circuit is used for inputting a reference voltage;
the input end of the voltage-controlled oscillation circuit is electrically connected with the output end of the first comparison circuit;
a first input end of the second comparison circuit is electrically connected with an output end of the first comparison circuit, and a second input end of the second comparison circuit is electrically connected with an output end of the voltage-controlled oscillation circuit;
a first end of the switching circuit is electrically connected with a positive output end of the power supply circuit, a second end of the switching circuit is electrically connected with an output end of the second comparison circuit, and a third end of the switching circuit is grounded; and
when the output signal of the first comparison circuit is greater than the output signal of the voltage-controlled oscillation circuit, the output signal of the second comparison circuit is at a high level, the switch circuit is switched on under the action of the high level, and the power supply circuit is charged; when the output signal of the first comparison circuit is smaller than the output signal of the voltage-controlled oscillation circuit, the output signal of the second comparison circuit is at a low level, the switch circuit is switched off under the action of the low level, and the power supply circuit discharges;
if the feedback voltage obtained by dividing the output voltage of the power supply circuit by the voltage dividing circuit is greater than the reference voltage, the output signal of the first comparison circuit is at a low level, the discharging time of the power supply circuit is longer than the charging time of the power supply circuit, and the output voltage of the power supply circuit is reduced;
if the feedback voltage obtained by dividing the output voltage of the power supply circuit by the voltage dividing circuit is less than or equal to the reference voltage, the output signal of the first comparison circuit is at a high level, the charging time of the power supply circuit is longer than the discharging time of the power supply circuit, and the output voltage of the power supply circuit is increased.
2. The display power supply of claim 1, wherein the voltage divider circuit comprises:
one end of the first resistor is electrically connected with the positive output end of the power supply circuit, and the other end of the first resistor is electrically connected with the first input end of the first comparison circuit;
and one end of the second resistor is electrically connected with one end of the first resistor and the first input end of the first comparison circuit respectively, and the other end of the second resistor is grounded.
3. The display power supply of claim 1, wherein the first comparison circuit comprises:
and the reverse input end of the first comparator is electrically connected with the second output end of the voltage division circuit, the forward input end of the first comparator is used for inputting the reference voltage, and the output end of the first comparator is respectively electrically connected with the input end of the voltage-controlled oscillation circuit and the first input end of the second comparator.
4. The display power supply of claim 1, wherein the voltage controlled oscillator circuit comprises:
the input end of the voltage-controlled oscillator is electrically connected with the output end of the first comparison circuit, and the output end of the voltage-controlled oscillator is electrically connected with the second input end of the second comparison circuit.
5. The display power supply of claim 4, wherein the second comparison circuit comprises:
and a positive input end of the second comparator is electrically connected with the output end of the first comparison circuit, a negative input end of the second comparator is electrically connected with the output end of the voltage-controlled oscillator, and an output end of the second comparator is electrically connected with the second end of the switch circuit.
6. The display power supply of claim 1, wherein the switching circuit comprises:
and the first end of the switch tube is electrically connected with the positive output end of the power supply circuit, the second end of the switch tube is electrically connected with the output end of the second comparison circuit, and the third end of the switch tube is grounded.
7. The display power supply of claim 1, wherein the power supply circuit comprises:
the negative electrode of the power supply is electrically connected with the first output end of the voltage division circuit respectively;
and one end of the inductor is electrically connected with the positive electrode of the power supply, and the other end of the inductor is electrically connected with the first end of the switch circuit.
8. The display power supply of claim 7, wherein the power supply circuit further comprises:
the anode of the diode is electrically connected with the other end of the inductor, and the cathode of the diode is the positive output end of the power supply circuit;
and one end of the capacitor is electrically connected with the cathode of the diode, and the other end of the capacitor is electrically connected with the cathode of the power supply.
9. A display power supply apparatus, comprising:
a power supply circuit for providing an output voltage;
the input end of the voltage division circuit is electrically connected with the positive output end of the power supply circuit, the first output end of the voltage division circuit is electrically connected with the negative output end of the power supply circuit, and the negative output end of the power supply circuit is grounded;
a first input end of the first comparison circuit is electrically connected with a second output end of the voltage division circuit, and a second input end of the first comparison circuit is used for inputting a reference voltage;
the input end of the voltage-controlled oscillator is electrically connected with the output end of the first comparison circuit;
a second comparison circuit, a first input terminal of the second comparison circuit being electrically connected to an output terminal of the first comparison circuit, a second input terminal of the second comparison circuit being electrically connected to an output terminal of the voltage-controlled oscillator;
a first end of the switching tube is electrically connected with a positive output end of the power supply circuit, a second end of the switching tube is electrically connected with an output end of the second comparison circuit, and a third end of the switching tube is grounded;
when the output signal of the first comparison circuit is greater than the output signal of the voltage-controlled oscillation circuit, the output signal of the second comparison circuit is at a high level, the switching tube is conducted under the action of the high level, and the power supply circuit is charged; when the output signal of the first comparison circuit is smaller than the output signal of the voltage-controlled oscillation circuit, the output signal of the second comparison circuit is at a low level, the switching tube is disconnected under the action of the low level, and the power supply circuit discharges;
if the feedback voltage obtained by dividing the output voltage of the power supply circuit by the voltage dividing circuit is greater than the reference voltage, the output signal of the first comparison circuit is at a low level, the discharging time of the power supply circuit is longer than the charging time of the power supply circuit, and the output voltage of the power supply circuit is reduced;
if the feedback voltage obtained by dividing the output voltage of the power supply circuit by the voltage dividing circuit is less than or equal to the reference voltage, the output signal of the first comparison circuit is at a high level, the charging time of the power supply circuit is longer than the discharging time of the power supply circuit, and the output voltage of the power supply circuit is increased.
10. A display system comprising the display power supply apparatus according to any one of claims 1 to 9; and
and the display power supply device is used for supplying power to the display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910494914.0A CN110121043B (en) | 2019-06-10 | 2019-06-10 | Display power supply device and display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910494914.0A CN110121043B (en) | 2019-06-10 | 2019-06-10 | Display power supply device and display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110121043A CN110121043A (en) | 2019-08-13 |
| CN110121043B true CN110121043B (en) | 2022-04-15 |
Family
ID=67523882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910494914.0A Active CN110121043B (en) | 2019-06-10 | 2019-06-10 | Display power supply device and display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110121043B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009638B (en) * | 2023-02-22 | 2023-07-11 | 禹创半导体(深圳)有限公司 | Reference voltage generation circuit, control method and device thereof and medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594123A (en) * | 2010-11-24 | 2012-07-18 | 罗姆股份有限公司 | Control circuit for switching power supply, control method, switching power supply and electronic apparatus |
| CN105226935A (en) * | 2014-05-29 | 2016-01-06 | 展讯通信（上海）有限公司 | Warbled Switching Power Supply is realized based on divided oscillator device |
| CN105634266A (en) * | 2016-03-18 | 2016-06-01 | 深圳市华星光电技术有限公司 | Control circuit for direct current-direct current converter |
| CN109494990A (en) * | 2019-01-03 | 2019-03-19 | 深圳市基准半导体有限公司 | A method of load transient response speed is improved using the variable Boost DC-DC of changeable frequency and mutual conductance |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120286750A1 (en) * | 2011-05-10 | 2012-11-15 | Peng Xu | Switching regulators with adaptive clock generators and associated methods of control |
| TWI445291B (en) * | 2011-10-12 | 2014-07-11 | Leadtrend Tech Corp | Methods and power controllers for primary side control |
| CN203233312U (en) * | 2013-04-25 | 2013-10-09 | 深圳市明微电子股份有限公司 | Switch power supply controller and switch power supply device |
| JP6382702B2 (en) * | 2014-12-12 | 2018-08-29 | 株式会社東芝 | Switching power supply circuit |
| JP5997348B1 (en) * | 2015-10-23 | 2016-09-28 | トレックス・セミコンダクター株式会社 | Switching power supply circuit |
-
2019
- 2019-06-10 CN CN201910494914.0A patent/CN110121043B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594123A (en) * | 2010-11-24 | 2012-07-18 | 罗姆股份有限公司 | Control circuit for switching power supply, control method, switching power supply and electronic apparatus |
| CN105226935A (en) * | 2014-05-29 | 2016-01-06 | 展讯通信（上海）有限公司 | Warbled Switching Power Supply is realized based on divided oscillator device |
| CN105634266A (en) * | 2016-03-18 | 2016-06-01 | 深圳市华星光电技术有限公司 | Control circuit for direct current-direct current converter |
| CN109494990A (en) * | 2019-01-03 | 2019-03-19 | 深圳市基准半导体有限公司 | A method of load transient response speed is improved using the variable Boost DC-DC of changeable frequency and mutual conductance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110121043A (en) | 2019-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6249445B1 (en) | Booster including charge pumping circuit with its electric power consumption reduced and method of operating the same | |
| US7372312B2 (en) | Pulse width modulation generating circuit | |
| US20060261880A1 (en) | Charge pump type booster circuit and antenna switch | |
| CN108054916B (en) | Charge pump system | |
| CN112929009B (en) | RC relaxation oscillator | |
| US20080303563A1 (en) | Triangular wave generator | |
| KR102021415B1 (en) | Voltage generator circuit | |
| US8890629B2 (en) | Oscillator circuit with comparator | |
| CN109327133A (en) | A kind of charge pump circuit | |
| US9484810B2 (en) | Semiconductor device and method of manufacturing the same | |
| CN110121043B (en) | Display power supply device and display system | |
| CN211859942U (en) | Charge pump circuit | |
| US10680524B2 (en) | Fast-charging voltage generator | |
| US11626862B2 (en) | Cyclic control of cells of an integrated circuit | |
| US7876585B2 (en) | Voltage providing circuit and related method thereof | |
| KR101462756B1 (en) | Apparatus for converting voltage and frequency dynamically | |
| CN112087131A (en) | Charge pump control circuit and battery control circuit | |
| CN112910446A (en) | Oscillator | |
| CN103338038A (en) | Phase-locked loop circuit | |
| CN110138206A (en) | Power driving circuit and display device | |
| US4233575A (en) | Wide frequency range current-controlled oscillator | |
| CN110212760A (en) | Show power supply unit | |
| CN109104078B (en) | Power supply management device, power supply and management method thereof | |
| CN108292893B (en) | Low dropout regulator and voltage regulation method | |
| CN108351657B (en) | Voltage regulating circuit and circuit voltage regulating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |