CN101728823A - Voltage adjusting device - Google Patents
Voltage adjusting device Download PDFInfo
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- CN101728823A CN101728823A CN200810169158A CN200810169158A CN101728823A CN 101728823 A CN101728823 A CN 101728823A CN 200810169158 A CN200810169158 A CN 200810169158A CN 200810169158 A CN200810169158 A CN 200810169158A CN 101728823 A CN101728823 A CN 101728823A
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Abstract
The invention discloses a voltage adjusting device which comprises a voltage adjusting chip, a first capacitor, a first resistor, a second capacitor and a second resistor. The voltage adjusting chip is provided with an enabling end, an input end and an output end, wherein the input end is used for receiving an input voltage, and the enabling end is used for receiving an enabling signal so as to enable the output end to output an output voltage. The first end of the first capacitor is coupled to the enabling end, and the second end of the first capacitor is coupled to an earthing end. The first resistor is connected in parallel with the first capacitor. The first end of the second resistor is coupled to the enabling end, and the second end thereof receives the input voltage. The first end of the second capacitor is coupled to the second end of the second resistor, and the second end thereof is coupled to the earthing end.
Description
Technical field
The invention relates to a kind of voltage adjusting device, and particularly relevant for a kind of voltage adjusting device of eliminating the output voltage surging.
Background technology
Generally speaking, electronic product can be made up of the chip of many difference in functionalitys, according to circuit design, the operating voltage of these chips not necessarily can be identical with the supply voltage of electronic product, cause electronic product must see through voltage adjusting device and produce the operating voltage that is different from supply voltage, to provide operating voltage to these chips, could allow electronics produce device can operate normally.
In the same manner, voltage adjusting device also can produce the operating voltage that is different from supply voltage via inside chip, and this chip just can produce operating voltage after receiving enable signal.With voltage adjusting device, when receiving supply voltage, can provide supply voltage and enable voltage simultaneously to its inside chip.But this moment, the circuit state of inside chip was stable as yet, if when receiving enable signal simultaneously, then the inner core sector-meeting produces the state that can not expect.Generally speaking, can allow an inside chip electric capacity in parallel, allow later its working value that is promoted to of enable signal, just formally enable inside chip.
Yet,, that is produce surging though the stability of shunt capacitance booster tension adjusting device when voltage adjusting device receives to supply voltage, but produces unexpected operating voltage in output signal.If this surging is sent to electronics when producing chip in the device, then may become the operation of electronic product not meet standard and produce the negative effect that can not expect, this is not the function that electronic product is desired to reach when design.
Summary of the invention
The invention provides a kind of voltage adjusting device, can eliminate because of voltage adjusting device and respond to enable signal in advance in the surging that output produced.
The present invention proposes a kind of voltage adjusting device, and it comprises voltage adjustment chip, first electric capacity, first resistance and second resistance.Voltage is adjusted chip and is had Enable Pin, input and output.Input is in order to receive input voltage.Enable Pin is exported an output voltage in order to receive enable signal to enable output.First end of first electric capacity is coupled to Enable Pin, and its second end is coupled to earth terminal.First resistance is in parallel with first electric capacity.First end of second resistance is coupled to Enable Pin, and its second termination is received input voltage.First end of second electric capacity is coupled to second end of second resistance, and second end of second electric capacity is coupled to earth terminal.
In one embodiment of this invention, wherein enable signal is promoted to the time of enable signal working value, is promoted to the time of input signal working value greater than input signal.
In one embodiment of this invention, the first above-mentioned resistance is that the capacitance of 2.2k ohm, first electric capacity is that the capacitance of 47 microfarads, second electric capacity is that 10 microfarads and second resistance are 1k ohm, and the working value of enable signal is 1.8 volts.
In sum, voltage adjusting device of the present invention is by a resistance is in parallel with the electric capacity of Enable Pin, to reduce the voltage swing that voltage adjusting device is sensed, so that voltage adjusting device can't enable and produce output voltage in output.By this, can eliminate because of voltage adjusting device and respond to enable signal in advance in the surging that output produced
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the voltage adjusting device circuit diagram that illustrates according to one embodiment of the invention.
Fig. 2 A, Fig. 2 B are the voltage oscillograms of the voltage adjusting device that illustrates according to one embodiment of the invention.
Embodiment
Fig. 1 is the voltage adjusting device circuit diagram that illustrates according to one embodiment of the invention.Please refer to Fig. 1, voltage adjusting device 100 comprises voltage adjustment chip 101, first resistance R 1, second resistance R 2, first capacitor C 1 and second capacitor C 2.First end of capacitor C 1 is coupled to Enable Pin EN, and its second end is coupled to earth terminal.Resistance R 1 shunt capacitance C1.First end of resistance R 2 is coupled to Enable Pin EN.First end of capacitor C 2 is coupled to second end of resistance R 2 and receives input voltage V
DD, its second end is coupled to earth terminal.
In the present embodiment, voltage adjustment chip 101 comprises input IN, output OUT and Enable Pin EN.Input IN is in order to receive input voltage V
DDEnable Pin EN, enables output OUT and exports an output voltage V when the voltage level of enable signal arrives its working value in order to receive enable signal
o
In detail, input voltage V
DDVoltage be can be sent to simultaneously and input IN, second end of resistance R 2 and first end of capacitor C 2 of chip 101 adjusted.And capacitor C 2 can be filtered input voltage V earlier
DDIn noise voltage, to stablize input voltage V
DDVoltage level.Though and the input IN of voltage adjustment chip 101 receives input voltage V
DDYet before the voltage level of enable signal arrived its working value, output OUT can't export described output voltage V
o
In addition, resistance R 2 its second terminations are received input voltage V
DDBe converted to enable signal through it, but because the charge effects of capacitor C 1, cause the enable signal that is sent to voltage adjustment chip 101 can postpone to be promoted to the time of its working value, make voltage adjusting device 100 when receiving input voltage, enable signal is promoted to the required time of its working value, can be greater than input voltage V
DDBe promoted to the required time of its working value.And the situation of shunt capacitance equivalent series inductance that C1 causes is also eliminated because of capacitor C 1 parallel resistance R1.
That is to say, in resistance R 2 with input voltage V
DDBeing converted to enable signal in a flash, can discharge via resistance R 1, and the voltage level that makes voltage adjust the enable signal that chip 101 senses in advance is about zero, then enable signal just can charge to capacitor C 1.When the voltage on the capacitor C 1 can enable voltage be adjusted chip 101 by the time the working value of enable signal (that is reach), the output OUT that voltage is adjusted chip 101 just can export described output voltage V
o
The below influence that promptly comes the capacitor C 1 of account for voltage adjusting device 100 to have or not parallel resistance R1 to be caused for an embodiment again.Fig. 2 A, Fig. 2 B are the voltage oscillograms of the voltage adjusting device that illustrates according to one embodiment of the invention.
Please be simultaneously with reference to Fig. 1, Fig. 2 A and Fig. 2 B, the capacitor C 1 that Fig. 2 A is depicted as voltage adjusting device 100 is the voltage oscillogram of parallel resistance R1 not, and Fig. 2 B is depicted as the voltage oscillogram of the capacitor C 1 parallel resistance R1 of voltage adjusting device 100.
In Fig. 2 A, waveform 210 is expression input voltage V
DDVoltage level, waveform 220 is the voltage level of expression output voltage V o.Can see in voltage adjusting device 100 received input voltage V at this
DDWhen voltage rose, voltage adjusting device 100 was because the effect of shunt capacitance equivalent series inductance that C2 produces makes voltage adjusting device 100 be induced to enable signal in advance, and the output voltage V of being exported at output OUT
oPromptly can produce surging.And this surging is not the voltage that designing institute expection produces, and this surging is possible when last time operating, its enable signal in capacitor C 1 residual electric power storage cause.
In Fig. 2 B, waveform 230 is expression input voltage V
DDVoltage level, waveform 240 is the expression output voltage V
oVoltage level.Owing in capacitor C 2 resistance R 1 in parallel, thereby can reduce the equivalent series inductance that shunt capacitance C2 is produced, reduce the voltage that voltage adjusting device 100 is sensed according to this.Shown in Fig. 2 B, in the voltage of waveform 230 rises, the output voltage V of its output
oDo not produce surging.
In an embodiment, resistance R 1 can be 2.2k ohm, and the capacitance of capacitor C 1 can be 47 microfarads (μ F), and the capacitance of capacitor C 2 can be 10 microfarads, and resistance R 1 can be 1k ohm, and the working value of enable signal for example is 1.8 volts.。
In sum, in the foregoing description,, just can accurately adjust the enable voltage that voltage adjusting device is sensed, make voltage adjusting device to enable and produce the output voltage of surging shape in output by electric capacity parallel resistance with Enable Pin.By this, can eliminate because of voltage adjusting device and respond to enable signal in advance in the surging that output produced.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (4)
1. voltage adjusting device comprises:
One voltage is adjusted chip, has an Enable Pin, an input and an output, and wherein, this input is in order to receive an input voltage, and this Enable Pin is exported an output voltage in order to receive an enable signal to enable this output;
One first electric capacity, first end of this first electric capacity is coupled to this Enable Pin, and second end of this first electric capacity is coupled to earth terminal;
One first resistance, in parallel with this first electric capacity;
One second resistance, first end of this second resistance is coupled to this Enable Pin, and second termination of this second resistance is received this input voltage; And
One second electric capacity, first end of this second electric capacity is coupled to second end of this second resistance, and second end of this second electric capacity is coupled to earth terminal.
2. voltage adjusting device as claimed in claim 1 is characterized in that, this first resistance is that the capacitance of 2.2k ohm, this first electric capacity is that the capacitance of 47 microfarads, this second electric capacity is that 10 microfarads and this second resistance are 1k ohm.
3. voltage adjusting device as claimed in claim 1 is characterized in that this enable signal is promoted to the time of an enable signal working value, is promoted to the time of an input voltage working value greater than this input voltage.
4. voltage adjusting device as claimed in claim 1 is characterized in that, the working value of this enable signal is 1.8 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101691586A CN101728823B (en) | 2008-10-23 | 2008-10-23 | Voltage adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101691586A CN101728823B (en) | 2008-10-23 | 2008-10-23 | Voltage adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101728823A true CN101728823A (en) | 2010-06-09 |
| CN101728823B CN101728823B (en) | 2012-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101691586A Expired - Fee Related CN101728823B (en) | 2008-10-23 | 2008-10-23 | Voltage adjusting device |
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| Country | Link |
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| CN (1) | CN101728823B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951133A (en) * | 2010-08-11 | 2011-01-19 | 京信通信系统（中国）有限公司 | Device for inhibiting impact current at electrifying moment of repeater power supply system |
| CN102820779A (en) * | 2011-06-10 | 2012-12-12 | 英业达股份有限公司 | Power control circuit |
| CN105048793A (en) * | 2015-08-25 | 2015-11-11 | 京东方科技集团股份有限公司 | Enable signal generation circuit, power conversion circuit and display apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101346U (en) * | 1991-07-05 | 1992-04-08 | 吴建新 | Silicon rectified ac generator voltage regulator for automobile |
| CN2129493Y (en) * | 1992-08-14 | 1993-04-07 | 吴广华 | Integrate circuit voltage regulater for automobile |
| US6118256A (en) * | 1999-08-03 | 2000-09-12 | Emerson Electric Co. | Circuit voltage regulator monitor |
-
2008
- 2008-10-23 CN CN2008101691586A patent/CN101728823B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951133A (en) * | 2010-08-11 | 2011-01-19 | 京信通信系统（中国）有限公司 | Device for inhibiting impact current at electrifying moment of repeater power supply system |
| CN102820779A (en) * | 2011-06-10 | 2012-12-12 | 英业达股份有限公司 | Power control circuit |
| CN105048793A (en) * | 2015-08-25 | 2015-11-11 | 京东方科技集团股份有限公司 | Enable signal generation circuit, power conversion circuit and display apparatus |
| CN105048793B (en) * | 2015-08-25 | 2017-06-30 | 京东方科技集团股份有限公司 | Enable signal generating circuit, power-switching circuit and display device |
| US10037733B2 (en) | 2015-08-25 | 2018-07-31 | Boe Technology Group Co., Ltd. | Enable signal generation circuit, power conversion circuit and display device |
| US10490135B2 (en) | 2015-08-25 | 2019-11-26 | Boe Technology Group Co., Ltd. | Enable signal generation circuit, power conversion circuit and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101728823B (en) | 2012-05-02 |
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Effective date of registration: 20180921 Address after: No. 5191 Huaishang Road, Huaishang District, Bengbu, Anhui Patentee after: ANHUI WANKONG SET EQUIPMENT MANUFACTURING CO., LTD. Address before: Taipei City, Taiwan Chinese Shilin District Hougang Street No. 66 Patentee before: Inventec Corporation |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120502 Termination date: 20181023 |