CN110784106A - Voltage reduction compensation circuit and compensation method thereof - Google Patents
Voltage reduction compensation circuit and compensation method thereof Download PDFInfo
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- CN110784106A CN110784106A CN201911028707.2A CN201911028707A CN110784106A CN 110784106 A CN110784106 A CN 110784106A CN 201911028707 A CN201911028707 A CN 201911028707A CN 110784106 A CN110784106 A CN 110784106A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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Abstract
The invention provides a voltage reduction compensation circuit and a compensation method thereof, wherein the voltage reduction compensation circuit is provided with an output end and a feedback end for outputting voltage, the output end is connected with a first connecting wire, the feedback end is connected with a second connecting wire, and the first connecting wire and the second connecting wire are both connected with a display module; the voltage reduction compensation circuit comprises a control chip for adjusting and compensating input voltage input to the display module and a voltage division adjusting circuit connected with the control chip, wherein the two ends of the voltage division adjusting circuit are respectively an input end and a feedback end. Because the connecting line has loss, the loss (including the loss of the first connecting line) on the output path is compensated by capturing the input voltage of the display module and then adjusting the input voltage at the switch pin SW of the control chip, so as to achieve the aim of stably outputting low voltage.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a voltage reduction compensation circuit and a compensation method thereof.
Background
When the low voltage is needed for testing, if 3.3V voltage is needed, the mains supply voltage needs to be changed into 12V and 1A direct current, and the 12V voltage is reduced to 3.3V by the current lighting fixture through a voltage reduction circuit.
The voltage reduction circuit in the prior art inputs a low voltage to an input end of a product through a connecting wire, and in the process of inputting the low voltage to the input end of the product, the voltage is divided on a line resistor of the connecting wire. Because the load of the display panel with high resolution is larger, the voltage division on the line resistance of the connecting line is also larger, which affects the voltage division of the voltage reduction circuit, so that the display panel with high resolution can not receive 3.3V voltage.
Disclosure of Invention
The invention aims to provide a buck compensation circuit and a buck compensation method thereof, wherein the buck compensation circuit is used for compensating loss on an input path and achieving the purpose of stabilizing input low voltage.
The invention provides a voltage reduction compensation circuit which is provided with an output end and a feedback end for outputting voltage, wherein the output end is connected with a first connecting wire, the feedback end is connected with a second connecting wire, and the first connecting wire and the second connecting wire are both connected with a display module; the voltage reduction compensation circuit comprises a control chip for adjusting and compensating input voltage input to the display module and a voltage division adjusting circuit connected with the control chip, wherein the two ends of the voltage division adjusting circuit are respectively an input end and a feedback end.
Preferably, the control chip comprises a controller, a first TFT switch and a second TFT switch, wherein a gate of the first TFT switch and a gate of the second TFT switch are both connected to the controller, a source of the first TFT switch is connected to a power input pin of the control chip, a drain of the first TFT switch and a source of the second TFT switch are connected to and connected to a switch pin of the control chip, and a drain of the second TFT switch is grounded.
Preferably, the voltage division adjusting circuit comprises an inductor, a first resistor, a second resistor, a third resistor and a capacitor, wherein a first end of the inductor is connected with a switch pin of the control chip, and a second end of the inductor is used as an output end of the buck compensation circuit and outputs voltage; the first end of the first resistor is connected with an output voltage feedback pin of the control chip, the first end of the second resistor is connected with the second end of the first resistor, the first end of the third resistor is connected between the first resistor and the second resistor, the second end of the third resistor and the first pole of the capacitor are grounded, and the other end of the second resistor and the second pole of the capacitor are both connected to a feedback end of the voltage reduction compensation circuit.
The invention also provides a compensation method of the voltage reduction compensation circuit, which comprises the following steps:
s1: capturing the input voltage actually input to the display module by the voltage reduction compensation circuit;
s2: the input voltage is compared with a set reference voltage and fed back to the controller;
s3: the controller finely adjusts the opening and closing time of the first TFT switch and the second TFT switch to achieve the purpose of finely adjusting the switch pins of the control chip.
Preferably, for step S1, the input voltage is divided by the second connection line, the second resistor and the first resistor and then captured by the output voltage feedback pin of the control chip.
Because the connecting line has loss, the loss (including the loss of the first connecting line) on the output path is compensated by capturing the input voltage of the display module and then adjusting the input voltage at the switch pin SW of the control chip, so as to achieve the aim of stably outputting low voltage.
Drawings
FIG. 1 is a schematic structural diagram of a buck compensation circuit connected to a display module via a connection line according to the present invention;
FIG. 2 is a schematic diagram of an output waveform of a control chip of the buck compensation circuit according to the present invention;
fig. 3 is a compensation diagram of the buck compensation circuit according to the present invention.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
The invention provides a voltage reduction compensation circuit, as shown in fig. 1, the voltage reduction compensation circuit is provided with an output end and a feedback end for outputting a voltage Vout, the output end is connected with a first connecting line 101, the feedback end is connected with a second connecting line 102, the first connecting line 101 and the second connecting line 102 are both connected with a display module 200, wherein the voltage reduction compensation circuit reduces a high voltage to a low voltage and outputs the voltage Vout to the first connecting line 101 through the output end, and then the voltage reduction compensation circuit and the first connecting line 101 are introduced into the display module 200; when compensation is required, the input voltage into the display module 200 is captured through the second connection line 102.
The buck compensation circuit comprises a control chip 10 and a voltage division regulating circuit 20 connected with the control chip 10 and outputting a voltage Vout, wherein two ends of the voltage division regulating circuit 20 are an input end and a feedback end respectively.
The control chip 10 includes a controller 11, a first TFT switch 12 and a second TFT switch 13, wherein a gate of the first TFT switch 12 and a gate of the second TFT switch 13 are both connected to the controller 11, a source of the first TFT switch 12 is connected to the power input pin Vin of the control chip 10, a drain of the first TFT switch 12 and a source of the second TFT switch 13 are connected to and connected to the switch pin SW of the control chip 10, and a drain of the second TFT switch 13 is grounded.
The voltage division regulating circuit 20 comprises an inductor L, a first resistor R1, a second resistor R2, a third resistor R3 and a capacitor C, wherein a first end of the inductor L is connected to a switch pin SW of the control chip 11, a second end of the inductor L is used as an output end of the buck compensation circuit and outputs a voltage Vout, and the output end is connected to the first connection line 101; the first end of the first resistor R1 is connected to the output voltage feedback pin FB of the control chip 11, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the first end of the third resistor R1 is connected between the first resistor R1 and the second resistor R2, the second end of the third resistor R2 and the first pole of the capacitor C are grounded, the other end of the second resistor R and the second pole of the capacitor C are both connected to the feedback end of the buck compensation circuit, and the feedback end is connected to the second connection line 102.
Fig. 2 is a waveform diagram of an output of a control chip of the buck compensation circuit, in which a power input pin Vin of the control chip 10 sequentially outputs a low level and a high level, which may occur as follows:
in the first situation, when the power input pin Vin of the control chip 10 is at a high level, the first TFT switch 12 is turned on, the second TFT switch 13 is turned off, the switch pin SW of the control chip 10 is at a high level, the input voltage Vin charges the inductor L, the current flows in the direction from the inductor L to the capacitor C, and flows from the line ① to the output voltage Vout shown in fig. 2 through the first connection line 101 to the display module 200.
In the second case, when the power input pin Vin of the control chip 10 is at a low level, the first TFT switch T1 is turned off, the second TFT switch T2 is turned on, the inductor L discharges as a power source, and current flows through the inductor L to the capacitor C, so as to keep the current direction in the inductor L unchanged, i.e., from the line ② to the output terminal Vout as shown in fig. 2.
The two situations are ideal conditions, a stable output voltage Vout can be generated in the ideal conditions, but the actual circuit fluctuates or is divided, and in order to ensure the stability of the Vout, closed-loop feedback is introduced to regulate the Vout in real time.
The invention also provides a compensation method of the voltage reduction compensation circuit, which comprises the following steps:
s1: capturing the input voltage actually input to the display module 200 by the buck compensation circuit;
s2: the input voltage is compared with a set reference voltage Vref and fed back to the controller 11;
s3: the controller 11 performs fine tuning on the on and off time of the first TFT switch 12 and the second TFT switch 13, so as to achieve the purpose of fine tuning the switch pin SW of the control chip 10.
For step S1, the input voltage is divided by the second connection line 102, the second resistor R2 and the first resistor R1 and then captured by the output voltage feedback pin of the control chip.
Because the connecting line has loss, the loss (including the loss of the first connecting line) on the output path is compensated by capturing the input voltage of the display module and then adjusting the input voltage at the switch pin SW of the control chip, so as to achieve the aim of stably outputting low voltage (such as 3.3V).
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the foregoing embodiments, and various equivalent changes (such as number, shape, position, etc.) may be made to the technical solution of the present invention within the technical spirit of the present invention, and these equivalent changes are all within the protection scope of the present invention.
Claims (5)
1. A voltage reduction compensation circuit is characterized by being provided with an output end and a feedback end, wherein the output end is used for outputting voltage, the output end is connected with a first connecting wire, the feedback end is connected with a second connecting wire, and the first connecting wire and the second connecting wire are both connected with a display module; the voltage reduction compensation circuit comprises a control chip for adjusting and compensating input voltage input to the display module and a voltage division adjusting circuit connected with the control chip, wherein the two ends of the voltage division adjusting circuit are respectively an input end and a feedback end.
2. The buck compensation circuit of claim 1, wherein: the control chip comprises a controller, a first TFT switch and a second TFT switch, wherein the grid electrode of the first TFT switch and the grid electrode of the second TFT switch are both connected with the controller, the source electrode of the first TFT switch is connected with a power input pin of the control chip, the drain electrode of the first TFT switch and the source electrode of the second TFT switch are connected with a switch pin of the control chip, and the drain electrode developed by the second TFT is grounded.
3. The buck compensation circuit of claim 1, wherein: the voltage division regulating circuit comprises an inductor, a first resistor, a second resistor, a third resistor and a capacitor, wherein the first end of the inductor is connected with a switch pin of the control chip, and the second end of the inductor is used as the output end of the voltage reduction compensating circuit and outputs voltage; the first end of the first resistor is connected with an output voltage feedback pin of the control chip, the first end of the second resistor is connected with the second end of the first resistor, the first end of the third resistor is connected between the first resistor and the second resistor, the second end of the third resistor and the first pole of the capacitor are grounded, and the other end of the second resistor and the second pole of the capacitor are both connected to a feedback end of the voltage reduction compensation circuit.
4. A compensation method of a buck compensation circuit according to any one of claims 1 to 3, wherein: the method comprises the following steps:
s1: capturing the input voltage actually input to the display module by the voltage reduction compensation circuit;
s2: the input voltage is compared with a set reference voltage and fed back to the controller;
s3: the controller finely adjusts the opening and closing time of the first TFT switch and the second TFT switch to achieve the purpose of finely adjusting the switch pins of the control chip.
5. The compensation method of the buck compensation circuit according to claim 4, wherein: for step S1, the input voltage is divided by the second connection line, the second resistor and the first resistor and then captured by the output voltage feedback pin of the control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911028707.2A CN110784106A (en) | 2019-10-25 | 2019-10-25 | Voltage reduction compensation circuit and compensation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911028707.2A CN110784106A (en) | 2019-10-25 | 2019-10-25 | Voltage reduction compensation circuit and compensation method thereof |
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| CN110784106A true CN110784106A (en) | 2020-02-11 |
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Citations (6)
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| CN202364122U (en) * | 2010-11-19 | 2012-08-01 | 罗姆股份有限公司 | Power supply device, liquid crystal driving device and liquid crystal display device |
| CN104715709A (en) * | 2013-12-13 | 2015-06-17 | 三星显示有限公司 | Dc-dc converter and display device including same |
| CN206164092U (en) * | 2016-11-09 | 2017-05-10 | 成都天府新区光启未来技术研究院 | Power supply system and unmanned aerial vehicle |
| CN107482909A (en) * | 2017-07-28 | 2017-12-15 | 惠州市德赛西威汽车电子股份有限公司 | A kind of line loss compensation circuit of power supply |
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
| CN110233572A (en) * | 2019-07-11 | 2019-09-13 | 苏州华兴源创科技股份有限公司 | A kind of constant pressure source and constant-voltage outputting method |
-
2019
- 2019-10-25 CN CN201911028707.2A patent/CN110784106A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202364122U (en) * | 2010-11-19 | 2012-08-01 | 罗姆股份有限公司 | Power supply device, liquid crystal driving device and liquid crystal display device |
| CN104715709A (en) * | 2013-12-13 | 2015-06-17 | 三星显示有限公司 | Dc-dc converter and display device including same |
| CN206164092U (en) * | 2016-11-09 | 2017-05-10 | 成都天府新区光启未来技术研究院 | Power supply system and unmanned aerial vehicle |
| CN107482909A (en) * | 2017-07-28 | 2017-12-15 | 惠州市德赛西威汽车电子股份有限公司 | A kind of line loss compensation circuit of power supply |
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
| CN110233572A (en) * | 2019-07-11 | 2019-09-13 | 苏州华兴源创科技股份有限公司 | A kind of constant pressure source and constant-voltage outputting method |
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Effective date of registration: 20200827 Address after: No.7 Tianyou Road, Qixia District, Nanjing City, Jiangsu Province Applicant after: NANJING CEC PANDA FPD TECHNOLOGY Co.,Ltd. Address before: Nanjing Crystal Valley Road in Qixia District of Nanjing City Tianyou 210033 Jiangsu province No. 7 Applicant before: NANJING CEC PANDA FPD TECHNOLOGY Co.,Ltd. Applicant before: NANJING CEC PANDA LCD TECHNOLOGY Co.,Ltd. Applicant before: Nanjing East China Electronic Information Technology Co.,Ltd. |
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Application publication date: 20200211 |