CN105405422A - Voltage stabilizing power supply circuit and liquid crystal display device - Google Patents
Voltage stabilizing power supply circuit and liquid crystal display device Download PDFInfo
- Publication number
- CN105405422A CN105405422A CN201510909176.3A CN201510909176A CN105405422A CN 105405422 A CN105405422 A CN 105405422A CN 201510909176 A CN201510909176 A CN 201510909176A CN 105405422 A CN105405422 A CN 105405422A
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- diode
- power supply
- voltage
- supply circuit
- electric capacity
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Abstract
The invention provides a voltage stabilizing power supply circuit comprising a boosting power supply and a voltage stabilizing module. The voltage stabilizing module comprises a second diode, a second capacitor, a third diode, a fourth diode, and a first resistor. The positive pole of the second diode is used to receive the DC input voltage, and the negative pole of the second diode is connected with a power supply input end of a first switch control unit. The second capacitor is connected between the negative pole of the second diode and the ground, and the positive pole of the third diode is grounded. The negative pole of the third diode is connected with the negative pole of the second diode, and the negative pole of the fourth diode is connected with the negative pole of the second diode. The first resistor is connected between the positive pole of the fourth diode and the first end of the first capacitor, and the clamp voltage of the third diode is greater than the minimum working voltage of the first switch control unit. The invention also provides a liquid crystal display device. By adopting the voltage stabilizing power supply circuit and the liquid crystal display device, the unstable output voltage phenomenon caused by the low DC input voltage can be prevented, and the costs are low.
Description
Technical field
The present invention relates to a kind of power circuit, particularly a kind of voltage-stabilized power supply circuit and liquid crystal indicator.
Background technology
Liquid crystal indicator (LiquidCrystalDisplay, LCD) possesses the plurality of advantages such as frivolous, energy-conservation, radiationless, has therefore replaced traditional cathode-ray tube (CRT) (CRT) display gradually.Current liquid crystal display is widely used in the electronic equipments such as HD digital TV, desk-top computer, personal digital assistant (PDA), notebook computer, mobile phone, digital camera.
When liquid crystal indicator works, the driving circuit that power circuit is display panels provides necessary voltage, and the operating voltage of power circuit has certain limit (for G5517, the scope of its operating voltage on specifications is 2.5V ~ 5.5V), may because such as video card module, audio-frequency module etc. the power consumption of other system module increases sharply lower than the minimum value of this operating voltage to the power supply of the operating voltage that power circuit provides, and power circuit may be caused to export the electric voltage exception of driving circuit to, display panels will be caused like this to show abnormal.
Chip in existing power circuit is generally replaced to the wider chip of operating voltage by prior art, but this method cost is high.
Therefore, be necessary to provide the technical scheme of improvement to overcome the above technical matters existed in prior art.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of voltage-stabilized power supply circuit, can stable output voltage and cost is low.
The invention provides a kind of voltage-stabilized power supply circuit, described voltage-stabilized power supply circuit comprises boost module and Voltage stabilizing module.Described boost module comprises the first inductance, the first on-off element, the first switch control unit, the first diode, the first electric capacity, wherein, the first end of described first inductance receives DC input voitage, second end of described first inductance is connected with the anode of described first diode, the negative electrode of described first diode is connected with the first end of described first electric capacity, second end ground connection of described first electric capacity, first path terminal of described first on-off element is connected with the anode of described first diode, the alternate path end ground connection of described first on-off element, the control end of described first on-off element is connected with described first switch control unit, Voltage stabilizing module, described Voltage stabilizing module comprises the second diode, the second electric capacity, the 3rd diode, the 4th diode, the first resistance, wherein, the anode of described second diode receives described DC input voitage, the negative electrode of the second diode is connected with the power input of described first switch control unit, the first end of described second electric capacity is connected with the negative electrode of described second diode, second end ground connection of described second electric capacity, the plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the negative electrode of described second diode, the negative electrode of the 4th diode is connected with the negative electrode of described second diode, between the anode that described first resistance is connected to described 4th diode and the first end of described first electric capacity, the clamp voltage of the 3rd diode is greater than the minimum operating voltage of the first switch control unit.
Further, described first diode is schottky diode.
Further, described 3rd diode is voltage stabilizing diode.
Further, described first on-off element in described boost module and described first switch control unit are integrated in power supply chip.
Further, the second diode in the module of described voltage stabilizing, the second electric capacity, the 3rd diode, the 4th diode, the first resistance are all positioned at the outside of power supply chip.
Further, the power pins of described power supply chip is connected with the negative electrode of described second diode.
The present invention also provides a kind of liquid crystal indicator using above-mentioned voltage-stabilized power supply circuit.
Further, described liquid crystal indicator also comprises power supply chip, and described first on-off element in described boost module and described first switch control unit are integrated in power supply chip.
Voltage-stabilized power supply circuit of the present invention and liquid crystal indicator, can utilize comprise the second diode, the second electric capacity, the 3rd diode, the 4th diode, the first resistance Voltage stabilizing module prevent DC input voitage when the minimum operating voltage lower than voltage-stabilized power supply circuit, and cause the phenomenon of output voltage instability, and cost is low.
By the detailed description below with reference to accompanying drawing, other side of the present invention and feature become obvious.But it should be known that accompanying drawing is only the object design of explanation, instead of as the restriction of scope of the present invention, this is because it should with reference to additional claim.Should also be appreciated that, unless otherwise noted, unnecessaryly draw accompanying drawing to scale, they only try hard to structure described herein and flow process are described conceptually.
Accompanying drawing explanation
Fig. 1 is the structural representation of the voltage-stabilized power supply circuit of first embodiment of the invention.
Fig. 2 is the structural representation of the voltage-stabilized power supply circuit of second embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Although the present invention uses first, second, third, etc. term to describe different elements, signal, port, assembly or part, these elements, signal, port, assembly or part be not by the restriction of these terms.These terms are only used to an element, signal, port, assembly or part and another element, signal, port, assembly or part to make a distinction.In the present invention, element, port, assembly or a part and another element, port, assembly or part " being connected ", " connection ", can be understood as direct electric connection, or also can be understood as the indirect electric connection that there is intermediary element.Unless otherwise defined, otherwise all terms used in the present invention (comprising technical term and scientific terminology) have the meaning usually understood with those skilled in the art.
Fig. 1 is the structural representation of the voltage-stabilized power supply circuit of first embodiment of the invention.As shown in Figure 1, voltage-stabilized power supply circuit comprises booster power and Voltage stabilizing module.
Wherein, boost module comprises the first inductance L 1, first on-off element T1, the first switch control unit U1, the first diode D1, the first electric capacity C1; Wherein, the first end of the first inductance L 1 receives DC input voitage VIN, second end of the first inductance L 1 is connected with the anode of the first diode D1, the negative electrode of the first diode D1 is connected with the first end of the first electric capacity C1, the second end ground connection of the first electric capacity C1, first path terminal of the first on-off element T1 is connected with the anode of the first diode D1, and the alternate path end ground connection of the first on-off element T1, the control end of the first on-off element T1 are connected with the first switch control unit U1.Wherein, the first diode D1 is schottky diode.
Wherein, Voltage stabilizing module comprises the second diode D2, the second electric capacity C2, the 3rd diode D3, the 4th diode D4, the first resistance R1; Wherein, the anode of the second diode D2 receives DC input voitage VIN, the negative electrode of the second diode D2 is connected with the power input of the first switch control unit U1, the first end of the second electric capacity C2 is connected with the negative electrode of the second diode D2, the second end ground connection of the second electric capacity C2, the plus earth of the 3rd diode D3, the negative electrode of the 3rd diode D3 is connected with the negative electrode of the second diode D2, the negative electrode of the 4th diode D4 is connected with the negative electrode of the second diode D2, and the first resistance R1 is connected between the anode of the 4th diode D4 and the first end of the first electric capacity C1.The clamp voltage of the 3rd diode D3 is greater than the minimum operating voltage of the first switch control unit U1.In an embodiment of the present invention, the 3rd diode D3 is voltage stabilizing diode.Certainly it will be appreciated by those skilled in the art that, if the minimum operating voltage of the first switch control unit U1 is lower, the 3rd diode D3 also can be the diode of other type.
Particularly, when DC input voitage VIN is greater than the minimum operating voltage of the first switch control unit U1, first switch control unit U1 mainly utilizes the electrical current that the second diode D2 flows through, thus the control end of output pulse width modulation signal to the first on-off element T1 normally works to make the first on-off element T1, and then make boost module that DC input voitage VIN is promoted to output voltage Vmain.When the minimum operating voltage of DC input voitage VIN lower than the first switch control unit U1, output voltage Vmain exports the first switch control unit U1 to after the first resistance R1 and the 4th diode D4, and due to the pressure stabilization function of the second electric capacity C2 and the clamping action of the 3rd diode D3, the voltage that first on-off element control module U1 receives can be greater than operating voltage (clamp voltage of the 3rd diode D3 is greater than the operating voltage of the first on-off element control module U1) and be stabilized near operating voltage, thus the first on-off element T1 can normally be worked, and then make the output voltage Vmain of booster circuit stable output.
Fig. 2 is the structural representation of the voltage-stabilized power supply circuit of second embodiment of the invention.As shown in Figure 2, the first on-off element T1 in boost module and the first switch control unit U1 is integrated in power supply chip, the first inductance L 1, first on-off element T1 in boost module, the first diode D1, the first electric capacity C1 are positioned at the outside of power supply chip, and the power input VDD of power supply chip is connected with the negative electrode of the second diode D2.
In an embodiment of the present invention, the second diode D2 in the module of voltage stabilizing, the second electric capacity C2, the 3rd diode D3, the 4th diode D4, the first resistance R1 are positioned at the outside of power supply chip.Certainly it will be appreciated by those skilled in the art that, can by the second diode D2 in the module of voltage stabilizing, the second electric capacity C2, the 3rd diode D3, the 4th diode D4, at least one of them is integrated in power supply chip the first resistance R1.
In an embodiment of the present invention, power supply chip can be G5517 chip, but the present invention is not as limit.
The present invention also provides a kind of liquid crystal indicator using above-mentioned voltage-stabilized power supply circuit.Voltage-stabilized power supply circuit comprises booster power and Voltage stabilizing module.
Wherein, boost module comprises the first inductance L 1, first on-off element T1, the first switch control unit U1, the first diode D1, the first electric capacity C1; Wherein, the first end of the first inductance L 1 receives DC input voitage VIN, second end of the first inductance L 1 is connected with the anode of the first diode D1, the negative electrode of the first diode D1 is connected with the first end of the first electric capacity C1, the second end ground connection of the first electric capacity C1, first path terminal of the first on-off element T1 is connected with the anode of the first diode D1, and the alternate path end ground connection of the first on-off element T1, the control end of the first on-off element T1 are connected with the first switch control unit U1.
Wherein, Voltage stabilizing module comprises the second diode D2, the second electric capacity C2, the 3rd diode D3, the 4th diode D4, the first resistance R1; Wherein, the anode of the second diode D2 receives DC input voitage VIN, the negative electrode of the second diode D2 is connected with the power input of the first switch control unit U1, the first end of the second electric capacity C2 is connected with the negative electrode of the second diode D2, the second end ground connection of the second electric capacity C2, the plus earth of the 3rd diode D3, the negative electrode of the 3rd diode D3 is connected with the negative electrode of the second diode D2, the negative electrode of the 4th diode D4 is connected with the negative electrode of the second diode D2, and the first resistance R1 is connected between the anode of the 4th diode D4 and the first end of the first electric capacity C1.The clamp voltage of the 3rd diode D3 is greater than the minimum operating voltage of the first switch control unit U1.
Voltage-stabilized power supply circuit of the present invention and liquid crystal indicator, can utilize comprise the second diode D2, the second electric capacity C2, the 3rd diode D3, the 4th diode D4, the first resistance R1 Voltage stabilizing module prevent DC input voitage VIN when the minimum operating voltage lower than voltage-stabilized power supply circuit, and cause the phenomenon of output voltage Vmain instability, and cost is low.
Apply specific case herein to set forth voltage-stabilized power supply circuit of the present invention, liquid crystal indicator and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; to sum up, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (8)
1. a voltage-stabilized power supply circuit, is characterized in that, described voltage-stabilized power supply circuit comprises:
Boost module, described boost module comprises the first inductance, the first on-off element, the first switch control unit, the first diode, the first electric capacity;
Wherein, the first end of described first inductance receives DC input voitage, second end of described first inductance is connected with the anode of described first diode, the negative electrode of described first diode is connected with the first end of described first electric capacity, second end ground connection of described first electric capacity, first path terminal of described first on-off element is connected with the anode of described first diode, the alternate path end ground connection of described first on-off element, the control end of described first on-off element is connected with described first switch control unit;
Voltage stabilizing module, described Voltage stabilizing module comprises the second diode, the second electric capacity, the 3rd diode, the 4th diode, the first resistance;
Wherein, the anode of described second diode receives described DC input voitage, the negative electrode of the second diode is connected with the power input of described first switch control unit, the first end of described second electric capacity is connected with the negative electrode of described second diode, second end ground connection of described second electric capacity, the plus earth of described 3rd diode, the negative electrode of described 3rd diode is connected with the negative electrode of described second diode, the negative electrode of the 4th diode is connected with the negative electrode of described second diode, between the anode that described first resistance is connected to described 4th diode and the first end of described first electric capacity, the clamp voltage of the 3rd diode is greater than the minimum operating voltage of the first switch control unit.
2. voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that, described first diode is schottky diode.
3. voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that, described 3rd diode is voltage stabilizing diode.
4. voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that, described first on-off element in described boost module and described first switch control unit are integrated in power supply chip.
5. voltage-stabilized power supply circuit as claimed in claim 4, is characterized in that, the second diode in the module of described voltage stabilizing, the second electric capacity, the 3rd diode, the 4th diode, the first resistance are all positioned at the outside of power supply chip.
6. voltage-stabilized power supply circuit as claimed in claim 5, it is characterized in that, the power pins of described power supply chip is connected with the negative electrode of described second diode.
7. a liquid crystal indicator, is characterized in that, described liquid crystal indicator comprises voltage-stabilized power supply circuit as claimed in claim 1.
8. liquid crystal indicator as claimed in claim 7, it is characterized in that, described liquid crystal indicator also comprises power supply chip, and described first on-off element in described boost module and described first switch control unit are integrated in power supply chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510909176.3A CN105405422B (en) | 2015-12-10 | 2015-12-10 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510909176.3A CN105405422B (en) | 2015-12-10 | 2015-12-10 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
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| CN105405422A true CN105405422A (en) | 2016-03-16 |
| CN105405422B CN105405422B (en) | 2018-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114596823A (en) * | 2020-12-07 | 2022-06-07 | 华润微集成电路(无锡)有限公司 | LCD driving circuit structure for realizing low power consumption and wide working voltage |
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| CN104754805A (en) * | 2013-12-31 | 2015-07-01 | 深圳富泰宏精密工业有限公司 | Backlight driving device |
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| KR20070121284A (en) * | 2006-06-21 | 2007-12-27 | 엘지.필립스 엘시디 주식회사 | Lcd and driving method thereof |
| CN201946973U (en) * | 2011-01-17 | 2011-08-24 | 惠州Tcl移动通信有限公司 | Static protection device of mobile terminal with touch screen |
| CN202210839U (en) * | 2011-08-01 | 2012-05-02 | 北京彩讯科技股份有限公司 | Simulated high definition video interface clamping protective circuit |
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| CN105405422B (en) | 2018-07-06 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |
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