CN110138206A - Power driving circuit and display device - Google Patents
Power driving circuit and display device Download PDFInfo
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- CN110138206A CN110138206A CN201910494999.2A CN201910494999A CN110138206A CN 110138206 A CN110138206 A CN 110138206A CN 201910494999 A CN201910494999 A CN 201910494999A CN 110138206 A CN110138206 A CN 110138206A
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- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application provides a kind of power driving circuits, including reduction voltage circuit, booster circuit, control circuit, switching circuit.Reduction voltage circuit is for receiving input voltage.Booster circuit is electrically connected with reduction voltage circuit, and for receiving first voltage.If first voltage is greater than or equal to setting voltage, booster circuit exports second voltage.The first end of control circuit is electrically connected with the output end of booster circuit, and for receiving second voltage.The second end of control circuit is for receiving input voltage.The first end of switching circuit is electrically connected with the third end of control circuit.The second end of switching circuit is electrically connected with the first end of control circuit.The third end of switching circuit is for exporting second voltage.Control circuit is turned on and off based on input voltage and second voltage control switch circuit, to realize that the output of second voltage is stablized.Present invention also provides a kind of display devices.The application, which can be avoided, generates abnormal convex wave in booting, so that the output of power driving circuit is stablized.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a power driving circuit and a display device.
Background
In the field of display technology, a power supply with multiple voltage output functions is often used to provide various operating voltages required for display of a display.
At present, the existing power circuit providing different operating voltages mainly includes a voltage step-up unit and a voltage step-down unit, the voltage step-down unit is used to generate a logic power VDD of the whole digital system, and the voltage step-up unit is used to generate a voltage VAA for charging the liquid crystal cell. The periphery of the boosting unit is also matched with some specific components, and finally, the external output voltage is output through the PMOS tube after being charged by the inductor and the diode.
In the conventional power supply circuit, the input voltage Vin gradually rises immediately after power-on, and the logic power supply VDD does not start operating, but the path of the voltage VAA output from the booster cell is already opened, so that the voltage VAA output from the booster cell generates a non-uniform convex wave. The generation of the irregular convex waves may damage a logic device at the rear end of a power supply object such as a display panel, and the power supply object may be burnt down seriously.
Disclosure of Invention
Therefore, it is necessary to provide a power driving circuit and a display device for solving the problem that the conventional power circuit generates a non-conventional convex wave when in use, which causes damage to a rear-end logic device.
A power supply driving circuit comprising:
the input end of the voltage reduction circuit is used for receiving input voltage, and the output end of the voltage reduction circuit is used for outputting first voltage;
the input end of the boost circuit is electrically connected with the output end of the voltage reduction circuit and is used for receiving the first voltage, if the first voltage is greater than or equal to a set voltage, the output end of the boost circuit outputs a second voltage, and if the first voltage is less than the set voltage, the boost circuit stops working;
a first end of the control circuit is electrically connected with the output end of the boost circuit and is used for receiving the second voltage, and a second end of the control circuit is used for receiving the input voltage;
the first end of the switching circuit is electrically connected with the third end of the control circuit, the second end of the switching circuit is electrically connected with the first end of the control circuit, the second end of the switching circuit is also used for receiving the input voltage, and the third end of the switching circuit is used for outputting a second voltage; and
the control circuit controls the switch circuit to be switched on and off based on the input voltage and the second voltage so as to realize the output stability of the second voltage.
In one embodiment, the control circuit comprises:
one end of the first resistor is electrically connected with the output end of the boost circuit and the second end of the switch circuit respectively, and the other end of the first resistor is electrically connected with the first end of the switch circuit;
and one end of the second resistor is electrically connected with the other end of the first resistor, and the other end of the second resistor is used for receiving the input voltage.
In one embodiment, the control circuit further comprises:
and the capacitor is connected in parallel with two ends of the first resistor.
In one embodiment, the switching circuit includes:
the control end of the switch tube is electrically connected with the third end of the control circuit, the first end of the switch tube is electrically connected with the first end of the control circuit, the first end of the switch tube is also used for receiving the input voltage, and the second end of the switch tube is used for outputting a second voltage.
In one embodiment, the power driving circuit further includes:
and one end of the inductor is used for receiving the input voltage, and the other end of the inductor is respectively and electrically connected with the first end of the control circuit and the second end of the switch circuit.
In one embodiment, the power driving circuit further includes:
and the first end of the voltage stabilizing circuit is electrically connected with the output end of the booster circuit and the other end of the inductor respectively, and the second end of the voltage stabilizing circuit is electrically connected with the first end of the control circuit.
In one embodiment, the voltage stabilizing circuit comprises:
and the anode of the diode is electrically connected with the output end of the booster circuit and the other end of the inductor respectively, and the cathode of the diode is electrically connected with the first end of the control circuit.
In one embodiment, the power driving circuit further includes:
and if the first voltage is less than the set voltage, the booster circuit stops working.
A power supply driving circuit comprising:
the input end of the voltage reduction circuit is used for receiving input voltage, and the output end of the voltage reduction circuit is used for outputting first voltage;
the input end of the boost circuit is electrically connected with the output end of the voltage reduction circuit and is used for receiving the first voltage, if the first voltage is greater than or equal to a set voltage, the output end of the boost circuit outputs a second voltage, and if the first voltage is less than the set voltage, the boost circuit stops working;
a first end of the control circuit is electrically connected with the output end of the boost circuit and is used for receiving the second voltage, and a second end of the control circuit is used for receiving the input voltage;
the first end of the switching circuit is electrically connected with the third end of the control circuit, the second end of the switching circuit is electrically connected with the first end of the control circuit, the second end of the switching circuit is also used for receiving the input voltage, and the third end of the switching circuit is used for outputting a second voltage; and
the control circuit controls the switch circuit to be switched on and off based on the input voltage and the second voltage so as to realize the output stability of the second voltage; wherein,
the control circuit comprises a first resistor and a second resistor, one end of the first resistor is electrically connected with the output end of the booster circuit and the second end of the switch circuit respectively, the other end of the first resistor is electrically connected with the first end of the switch circuit and one end of the second resistor respectively, and the other end of the second resistor is used for receiving the input voltage.
A display device comprising the power supply driving circuit of any one of the above embodiments; and
and the display panel is electrically connected with the power driving circuit and is used for receiving the second voltage.
Compared with the prior art, the power driving circuit and the display device utilize the cooperation of the boost circuit and the control circuit, so that when the first voltage output by the buck circuit is greater than or equal to the set voltage, the boost circuit works and outputs the second voltage, and the control circuit controls the switch circuit to be switched on or switched off based on the input voltage and the second voltage, thereby realizing the stable output of the second voltage. The application can avoid generating abnormal convex waves when the power supply is started, so that the output of the power supply driving circuit is stable.
Drawings
Fig. 1 is a circuit block diagram of a power driving circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a power driving circuit according to an embodiment of the present disclosure;
fig. 3 is a timing diagram of a power driving circuit according to an embodiment of the present application;
fig. 4 is a circuit block diagram of a display device according to an embodiment of the present application.
10 power supply driving circuit
11 display panel
100 step-down circuit
101 input voltage
102 first voltage
20 display device
200 boost circuit
201 second voltage
300 control circuit
310 first resistance
320 second resistance
330 capacitor
400 switching circuit
410 switch tube
500 inductance
510 pipeline circulation control unit
520 breathing machine control unit
530 centrifugal pump control unit
600 voltage stabilizing circuit
610 diode
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 power driving circuit 10, including: buck circuit 100, boost circuit 200, control circuit 300, switching circuit 400. The input terminal of the voltage dropping circuit 100 is used for receiving an input voltage 101. The output terminal of the voltage-reducing circuit 100 is used for outputting a first voltage 102. An input terminal of the voltage boost circuit 200 is electrically connected to an output terminal of the voltage step-down circuit 100, and is configured to receive the first voltage 102. If the first voltage 102 is greater than or equal to a predetermined voltage, the output terminal of the voltage boost circuit 200 outputs a second voltage 201.
A first terminal of the control circuit 300 is electrically connected to the output terminal of the voltage boost circuit 200 and is configured to receive the second voltage 201. A second terminal of the control circuit 300 is configured to receive the input voltage 101. The first terminal of the switching circuit 400 is electrically connected to the third terminal of the control circuit 300. A second terminal of the switch circuit 400 is electrically connected to a first terminal of the control circuit 300. The second terminal of the switch circuit 400 is also used for receiving the input voltage 101. The third terminal of the switch circuit 400 is used for outputting the second voltage 201. The control circuit 300 controls the switch circuit 400 to be turned on and off based on the input voltage 101 and the second voltage 201, so as to stabilize the output of the second voltage 201.
In one embodiment, the voltage step-down circuit 100 may employ a conventional voltage step-down circuit structure. In one embodiment, the input terminal of the voltage-reducing circuit 100 receives the input voltage 101(Vin), and outputs the first voltage 102 after reducing the input voltage 101. In one embodiment, the voltage-reducing circuit 100 is used to provide a logic power supply VDD (i.e., the first voltage 102) for a power supply circuit.
In one embodiment, the BOOST circuit 200 may employ a conventional BOOST circuit structure, such as a BOOST circuit. In one embodiment, the boost circuit 200 is used to generate the required operating voltage VAA (i.e., the second voltage 201) for the backend device.
In one embodiment, if the first voltage 102 is greater than or equal to a set voltage, the outputting the second voltage 201 by the output terminal of the voltage boost circuit 200 means: the boost circuit 200 receives the first voltage 102 output by the output terminal of the buck circuit 100, compares the first voltage with the set voltage, and if the first voltage 102 is greater than or equal to the set voltage, the boost circuit 200 starts to operate and outputs the second voltage 201. If the first voltage 102 is less than the set voltage, the boosting circuit 200 stops working, and the boosting circuit 200 starts working only when the first voltage 102 is greater than or equal to the set voltage.
It is understood that the specific circuit structure of the control circuit 300 is not particularly limited as long as it has a function of controlling the on and off of the switch circuit 400 based on the input voltage 101 and the second voltage 201. The specific circuit structure of the control circuit 300 can be selected according to actual requirements. In one embodiment, the control circuit 300 may be composed of a plurality of common resistors connected in series. In one embodiment, the control circuit 300 may also be constructed by a charging/discharging capacitor and a plurality of common resistors. The control circuit 300 is used for controlling the switch circuit 400 to be switched on and off based on the input voltage 101 and the second voltage 201, so that the output of the second voltage 201 is stabilized.
It is understood that the specific circuit structure of the switch circuit 400 is not particularly limited as long as the switch circuit 400 has a function of controlling the on and off of the switch circuit 400 through the control circuit 300. The specific circuit structure of the switch circuit 400 can be selected according to actual requirements. In one embodiment, the switch circuit 400 may be composed of PMOS transistors. In one embodiment, the switching circuit 400 may also be composed of a transistor.
In one embodiment, the voltage boost circuit 200 receives the first voltage 102, and if the first voltage 102 is smaller than the set voltage, the voltage boost circuit 200 stops operating, that is, no voltage is output from the output terminal of the voltage boost circuit 200. At this time, the voltage received by the first terminal and the voltage received by the second terminal of the control circuit 300 are equal, that is, VAA is Vin; at this time, the on-state voltage of the switch circuit 400 is zero, that is, the switch circuit 400 is in the off-state, and the second voltage 201 cannot be output.
In one embodiment, if the first voltage 102 is greater than or equal to the set voltage, the voltage boosting circuit 200 starts to operate, that is, the output terminal of the voltage boosting circuit 200 outputs the second voltage 201. At this time, the Voltage (VAA) received by the first end of the control circuit 300 gradually rises, and when the voltage output by the control circuit 300 reaches the turn-on voltage of the switch circuit 400, the switch circuit 400 is in a conducting state, so that the second voltage 201 is stably output, and abnormal convex waves can be prevented from being generated during the startup.
In this embodiment, by using the cooperation of the boost circuit 200 and the control circuit 300, when the first voltage 102 output by the buck circuit 100 is greater than or equal to the set voltage, the boost circuit 200 operates and outputs the second voltage 201, and the control circuit 300 controls the switch circuit 400 to be turned on or off based on the input voltage 101 and the second voltage 201, so as to achieve stable output of the second voltage 201. The embodiment can avoid generating abnormal convex waves when the power supply is started, so that the output of the power supply driving circuit is stable.
Referring to fig. 2, in one embodiment, the control circuit 300 includes a first resistor 310 and a second resistor 320. One end of the first resistor 310 is electrically connected to the output end of the boosting circuit 200 and the second end of the switch circuit 400, respectively. The other end of the first resistor 310 is electrically connected to a first end of the switch circuit 400. One end of the second resistor 320 is electrically connected to the other end of the first resistor 310. The other end of the second resistor 320 is used for receiving the input voltage 101.
In one embodiment, the first resistor 310 and/or the second resistor 320 may be resistors with fixed resistance values. The control circuit 300 formed by the first resistor 310 and the second resistor 320 can control the switch circuit 400 to be turned on and off. In one embodiment, the delay time of the second voltage 201 relative to the first voltage 102 (as shown in fig. 3) can be controlled by setting the resistance ratio between the first resistor 310 and the second resistor 320.
In one embodiment, the control circuit 300 further comprises a capacitor 330. The capacitor 330 is connected in parallel to two ends of the first resistor 310. By charging and discharging the capacitor 330, the delay time of the second voltage 201 relative to the first voltage 102 can be controlled, and the delay effect is better when the delay time is matched with the first resistor 310.
In one embodiment, the switching circuit 400 includes: a switching tube 410. The control terminal of the switching tube 410 is electrically connected to the third terminal of the control circuit 300. The first end of the switching tube 410 is electrically connected to the first end of the control circuit 300. The first terminal of the switching tube 410 is further configured to receive the input voltage 101. The second end of the switching tube 410 is used for outputting the second voltage 201.
In one embodiment, the switching tube 410 may be a triode. In one embodiment, the switch tube 410 may also be a PMOS tube. If the switch tube 410 is a PMOS tube, the gate Voltage (VG) of the PMOS tube is: VG ═ Vin + (VAA-Vin) × R2/(R1+ R2); wherein, R1 is the first resistor 310, R2 is the second resistor 320, Vin is the input voltage 101, and VAA is the second voltage 201. The voltage difference between the gate and source (VGS) is: the VGS-VG-VAA is (Vin-VAA) × R1/(R1+ R2), so that the magnitude of VGS can be controlled by setting the resistance ratio between the first resistor 310 and the second resistor 320, and the opening of the PMOS transistor can be controlled, thereby finally controlling the output of VAA.
In one embodiment, the power driving circuit 10 further includes an inductor 500. One end of the inductor 500 is used for receiving the input voltage 101. The other end of the inductor 500 is electrically connected to the first end of the control circuit 300 and the second end of the switch circuit 400, respectively. The inductor 500 can be used to smooth the current when the input voltage 101 is applied.
In one embodiment, the power driving circuit 10 further comprises a voltage stabilizing circuit 600. The first end of the voltage stabilizing circuit 600 is electrically connected to the output end of the boost circuit 200 and the other end of the inductor 600, respectively. The second terminal of the voltage stabilizing circuit 600 is electrically connected to the first terminal of the control circuit 300.
It should be understood that the specific circuit structure of the voltage stabilizing circuit 600 is not limited specifically, as long as the voltage stabilizing function is ensured. The specific circuit structure of the voltage stabilizing circuit 600 can be selected according to actual requirements. In one embodiment, the voltage stabilizing circuit 600 may be comprised of a voltage regulator. In one embodiment, the voltage stabilizing circuit 600 may also be composed of a voltage stabilizing resistor. The voltage stabilizing circuit 600 can make the current more stable when the input voltage 101 is loaded.
In one embodiment, the stabilizing circuit 600 includes a diode 610. The anode of the diode 610 is electrically connected to the output terminal of the boost circuit 200 and the other end of the inductor 600. The cathode of the diode 610 is electrically connected to the first terminal of the control circuit 300. The diode 610 which is conducted in a unidirectional mode controls the flow direction of current, and therefore interference of electric signals at the rear end to the booster circuit 200 and the like is avoided.
An embodiment of the present application provides a power driving circuit 10, including: buck circuit 100, boost circuit 200, control circuit 300, switching circuit 400. The input terminal of the voltage dropping circuit 100 is used for receiving an input voltage 101. The output terminal of the voltage-reducing circuit 100 is used for outputting a first voltage 102. An input terminal of the voltage boost circuit 200 is electrically connected to an output terminal of the voltage step-down circuit 100, and is configured to receive the first voltage 102. If the first voltage 102 is greater than or equal to a predetermined voltage, the output terminal of the voltage boost circuit 200 outputs a second voltage 201. If the first voltage 102 is less than the set voltage, the boosting circuit 200 stops working.
A first terminal of the control circuit 300 is electrically connected to the output terminal of the voltage boost circuit 200 and is configured to receive the second voltage 201. A second terminal of the control circuit 300 is configured to receive the input voltage 101. The first terminal of the switching circuit 400 is electrically connected to the third terminal of the control circuit 300. A second terminal of the switch circuit 400 is electrically connected to a first terminal of the control circuit 300. The second terminal of the switch circuit 400 is also used for receiving the input voltage 101. The third terminal of the switch circuit 400 is used for outputting the second voltage 201.
The control circuit 300 controls the switch circuit 400 to be turned on and off based on the input voltage 101 and the second voltage 201, so as to stabilize the output of the second voltage 201. The control circuit (300) includes a first resistor 310 and a second resistor 320. One end of the first resistor 310 is electrically connected to the output end of the boosting circuit 200 and the second end of the switch circuit 400, respectively. The other end of the first resistor 310 is electrically connected to the first end of the switch circuit 400 and one end of the second resistor 320, respectively. The other end of the second resistor 320 is used for receiving the input voltage 101.
In one embodiment, when the present application is used, the first voltage 102 is received by the voltage boost circuit 200, and if the first voltage 102 is smaller than the set voltage, the voltage boost circuit 200 stops operating, that is, no voltage is output from the output terminal of the voltage boost circuit 200. At this time, the voltage received by the first terminal and the voltage received by the second terminal of the control circuit 300 are equal, that is, VAA is Vin; at this time, the PMOS transistor (i.e. the switch transistor 410) is not turned on, and the second voltage 201 cannot be output.
In one embodiment, if the first voltage 102 is greater than or equal to the set voltage, the voltage boosting circuit 200 starts to operate, that is, the output terminal of the voltage boosting circuit 200 outputs the second voltage 201. At this time, the Voltage (VAA) received by the first end of the control circuit 300 gradually rises, the VGS voltage of the PMOS transistor gradually decreases, and when the voltage is lower than the turn-on voltage of the PMOS transistor, the PMOS transistor starts to be turned on, so that the VAA (i.e., the second voltage 201) has no abnormal bulge wave, and the delayed output of the VAA can be controlled by controlling the generation speed of the VGS, thereby further ensuring the normal operation of the chip.
To sum up, this application utilizes boost circuit 200 with control circuit 300's cooperation for first voltage 102 that step-down circuit 100 outputs is greater than or equal to when setting for the voltage, boost circuit 200 works and exports second voltage 201, and through control circuit 300 is based on input voltage 101 with second voltage 201 control switch circuit 400 switches on or closes, thereby realizes the output of second voltage 201 is stable. The power supply driving circuit can avoid generating abnormal convex waves when the power supply is started, so that the output of the power supply driving circuit is stable, and the power supply driving circuit further has the advantages of low cost and easiness in implementation.
Referring to fig. 4, an embodiment of the present application provides a display device 20, which includes the power driving circuit 10 and the display panel 11 according to any of the embodiments. The display panel 11 is electrically connected to the power driving circuit 10. The display panel 11 is configured to receive the second voltage 201.
In the display device 20 according to this embodiment, by using the cooperation between the voltage boosting circuit 200 and the control circuit 300 in the power driving circuit 10, when the first voltage 102 output by the voltage dropping circuit 100 is greater than or equal to the set voltage, the voltage boosting circuit 200 operates and outputs the second voltage 201, and the control circuit 300 controls the switching circuit 400 to be turned on or off based on the input voltage 101 and the second voltage 201, so as to achieve stable output of the second voltage 201. The embodiment can avoid generating abnormal convex waves when the power supply is started, so that the output of the power supply driving circuit is stable.
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 power supply driving circuit, comprising:
the input end of the voltage reduction circuit is used for receiving input voltage, and the output end of the voltage reduction circuit is used for outputting first voltage;
the input end of the boost circuit is electrically connected with the output end of the voltage reduction circuit and is used for receiving the first voltage, if the first voltage is greater than or equal to a set voltage, the output end of the boost circuit outputs a second voltage, and if the first voltage is less than the set voltage, the boost circuit stops working;
a first end of the control circuit is electrically connected with the output end of the boost circuit and is used for receiving the second voltage, and a second end of the control circuit is used for receiving the input voltage;
the first end of the switching circuit is electrically connected with the third end of the control circuit, the second end of the switching circuit is electrically connected with the first end of the control circuit, the second end of the switching circuit is also used for receiving the input voltage, and the third end of the switching circuit is used for outputting a second voltage; and
the control circuit controls the switch circuit to be switched on and off based on the input voltage and the second voltage so as to realize the output stability of the second voltage.
2. The power supply drive circuit according to claim 1, wherein the control circuit comprises:
one end of the first resistor is electrically connected with the output end of the boost circuit and the second end of the switch circuit respectively, and the other end of the first resistor is electrically connected with the first end of the switch circuit;
and one end of the second resistor is electrically connected with the other end of the first resistor, and the other end of the second resistor is used for receiving the input voltage.
3. The power supply drive circuit of claim 2, wherein the control circuit further comprises:
and the capacitor is connected in parallel with two ends of the first resistor.
4. The power supply drive circuit according to claim 1, wherein the switch circuit comprises:
the control end of the switch tube is electrically connected with the third end of the control circuit, the first end of the switch tube is electrically connected with the first end of the control circuit, the first end of the switch tube is also used for receiving the input voltage, and the second end of the switch tube is used for outputting a second voltage.
5. The power supply drive circuit according to claim 1, further comprising:
and one end of the inductor is used for receiving the input voltage, and the other end of the inductor is respectively and electrically connected with the first end of the control circuit and the second end of the switch circuit.
6. The power supply drive circuit according to claim 5, further comprising:
and the first end of the voltage stabilizing circuit is electrically connected with the output end of the booster circuit and the other end of the inductor respectively, and the second end of the voltage stabilizing circuit is electrically connected with the first end of the control circuit.
7. The power supply drive circuit of claim 6 wherein the voltage regulator circuit comprises:
and the anode of the diode is electrically connected with the output end of the booster circuit and the other end of the inductor respectively, and the cathode of the diode is electrically connected with the first end of the control circuit.
8. The power supply drive circuit according to claim 1, further comprising:
and if the first voltage is less than the set voltage, the booster circuit stops working.
9. A power supply driving circuit, comprising:
the input end of the voltage reduction circuit is used for receiving input voltage, and the output end of the voltage reduction circuit is used for outputting first voltage;
the input end of the boost circuit is electrically connected with the output end of the voltage reduction circuit and is used for receiving the first voltage, if the first voltage is greater than or equal to a set voltage, the output end of the boost circuit outputs a second voltage, and if the first voltage is less than the set voltage, the boost circuit stops working;
a first end of the control circuit is electrically connected with the output end of the boost circuit and is used for receiving the second voltage, and a second end of the control circuit is used for receiving the input voltage;
the first end of the switching circuit is electrically connected with the third end of the control circuit, the second end of the switching circuit is electrically connected with the first end of the control circuit, the second end of the switching circuit is also used for receiving the input voltage, and the third end of the switching circuit is used for outputting a second voltage; and
the control circuit controls the switch circuit to be switched on and off based on the input voltage and the second voltage so as to realize the output stability of the second voltage; wherein,
the control circuit comprises a first resistor and a second resistor, one end of the first resistor is electrically connected with the output end of the booster circuit and the second end of the switch circuit respectively, the other end of the first resistor is electrically connected with the first end of the switch circuit and one end of the second resistor respectively, and the other end of the second resistor is used for receiving the input voltage.
10. A display device comprising the power supply driving circuit according to any one of claims 1 to 9; and
and the display panel is electrically connected with the power driving circuit and is used for receiving the second voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910494999.2A CN110138206A (en) | 2019-06-10 | 2019-06-10 | Power driving circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910494999.2A CN110138206A (en) | 2019-06-10 | 2019-06-10 | Power driving circuit and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN118116304A (en) * | 2024-01-17 | 2024-05-31 | 重庆惠科金渝光电科技有限公司 | Driving circuit of display panel and display device |
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| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN118116304A (en) * | 2024-01-17 | 2024-05-31 | 重庆惠科金渝光电科技有限公司 | Driving circuit of display panel and display device |
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Application publication date: 20190816 |