CN107040738A - Eliminate voltage and current exceeded circuit when semiotic function module starts upper electricity - Google Patents
Eliminate voltage and current exceeded circuit when semiotic function module starts upper electricity Download PDFInfo
- Publication number
- CN107040738A CN107040738A CN201710245301.4A CN201710245301A CN107040738A CN 107040738 A CN107040738 A CN 107040738A CN 201710245301 A CN201710245301 A CN 201710245301A CN 107040738 A CN107040738 A CN 107040738A
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- CN
- China
- Prior art keywords
- electric capacity
- resistor
- resistance
- circuit
- voltage
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/284—Modifications for introducing a time delay before switching in field effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
Abstract
Voltage and current exceeded circuit when starting upper electricity the invention discloses a kind of elimination semiotic function module; it is characterized in that; it includes master chip, switching signal control circuit and power switch drive circuit; the master chip, switching signal control circuit and the power supply drive circuit that opens the light are sequentially connected electrically; the present invention realizes LCD TV or display function module for power supply voltage, electric current are stepped up; solve because functional module moment upper electricity and caused by voltage, electric current is exceeded the problem of, reach the purpose for avoiding module operation irregularity or device failure caused by electrifying startup.
Description
Technical field
The present invention relates to TV technology, and in particular to one kind eliminates voltage and electricity when semiotic function module starts upper electricity
The exceeded circuit of stream.
Background technology
The function of current liquid crystal TV set or display becomes increasingly complex, and the functional module that inside is used is also more and more,
Such as radio communication, 3D processing, TCON processing, MEMC processing；Every kind of module has start supply voltage, the stabilization of electric current above
Property require, and although current power supply module has a Voltage Feedback stabilizing circuit, but electric wink in above-mentioned functions module during start
Between the of short duration exceeded situation of voltage, electric current still occurs, when more than module tolerance range, it is most likely that cause module work it is different
Normal or device failure.
The content of the invention
Module operation irregularity or device failure are easily caused instant invention overcomes Voltage Feedback stabilizing circuit in the prior art,
There is the of short duration exceeded situation of supply voltage, electric current in powered on moment in each autonomous working functional module when providing a kind of elimination start
Eliminate voltage and current exceeded circuit when semiotic function module starts upper electricity.
To solve above-mentioned technical problem, the present invention uses following technical scheme：
Voltage and current exceeded circuit when a kind of elimination semiotic function module starts upper electricity, it includes master chip, switch
Signal control circuit and power switch drive circuit, the master chip, switching signal control circuit and power supply are opened the light drive circuit
It is sequentially connected electrically；
The switching signal control circuit is made up of first resistor R1, second resistance R2, the first electric capacity C1 and triode Q1,
The switch control pin of one end of the first resistor R1 and master chip is electrically connected, and the other end of the first resistor R1 is respectively with the
The base stage electrical connection of two resistance R2 one end, the first electric capacity C1 one end and triode Q1, another termination of the resistance R2
Ground, the other end ground connection of the resistance C1, the grounded emitter of the triode Q1；
The power switch drive circuit is by 3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3 and field-effect transistor
Q2, one end of the 4th resistance R4 is electrically connected with triode Q1 colelctor electrode, the other end of the 4th resistance R4 respectively with
The grid electrical connection of 3rd resistor R3 one end, the 3rd electric capacity C3 one end and field-effect transistor Q2, the 3rd electric capacity
The C3 other end is electrically connected with the 3rd resistor R3 other end and field-effect transistor Q2 source electrode respectively.
Further technical scheme is, in addition to the second electric capacity C2 and the 4th electric capacity C4, described second electric capacity C2 one end
Ground connection, the other end and power electric connection of the other end of the second electric capacity C2 respectively with 3rd resistor R3, the 4th electric capacity
C4 one end ground connection, the drain electrode respectively with field-effect transistor Q2 of the other end of the 4th electric capacity C4 and functional module are powered defeated
Incoming interface is electrically connected.
By being switched to increasing on original LCD TV or the power supply circuit of the functional module of display in the technical program
Switch control pin on signal control circuit and power switch drive circuit, and the master chip for passing through LCD TV or display leads to
The plug-in for crossing master chip realizes that the soft start break-make for controlling switching signal circuit is controlled, and is increasing less material and cost
In the case of, eliminate the exceeded phenomenon of voltage when complete machine internal signal functional module starts upper electricity, electric current.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention realizes LCD TV or display function module for power supply voltage, electric current are stepped up, and solves because of function
Module moment upper electricity and cause voltage, the problem of electric current is exceeded, reach the module operation irregularity avoided caused by electrifying startup
Or the purpose of device failure.
Brief description of the drawings
Fig. 1 eliminates voltage and current exceeded circuit when semiotic function module starts upper electricity for an embodiment of the present invention
Schematic diagram.
Fig. 2 is the figure functional module start power-on switch control flow chart of an embodiment of the present invention.
Embodiment
The present invention is further elaborated below in conjunction with the accompanying drawings.
As shown in figure 1, voltage and current exceeded circuit when a kind of elimination semiotic function module starts upper electricity, it includes master
Chip, switching signal control circuit and power switch drive circuit, the master chip, switching signal control circuit and power supply are opened the light
Drive circuit is sequentially connected electrically；The switching signal controls circuit by first resistor R1, second resistance R2, the first electric capacity C1 and three
Level pipe Q1 compositions, one end of the first resistor R1 is electrically connected with the switch control pin of master chip, and the first resistor R1's is another
One end, the first electric capacity C1 one end and the triode Q1 base stage of one end respectively with second resistance R2 are electrically connected, the resistance
R2 other end ground connection, the other end ground connection of the resistance C1, the grounded emitter of the triode Q1；The power switch drives
Dynamic circuit is by 3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3 and field-effect transistor Q2, one end of the 4th resistance R4
Electrically connected with triode Q1 colelctor electrode, the other end of the 4th resistance R4 one end respectively with 3rd resistor R3, the 3rd electricity
Hold C3 one end and field-effect transistor Q2 grid electrical connection, the other end of the 3rd electric capacity C3 respectively with 3rd resistor
The source electrode electrical connection of the R3 other end and field-effect transistor Q2.
The circuit also includes the second electric capacity C2 and the 4th electric capacity C4 simultaneously, described second electric capacity C2 one end ground connection, and described the
The other end and power electric connection of the two electric capacity C2 other end respectively with 3rd resistor R3, a termination of the 4th electric capacity C4
Ground, the drain electrode respectively with field-effect transistor Q2 of the other end of the 4th electric capacity C4 and functional module supply input interface are electrically connected
Connect.
Simultaneously by functional module start power-on switch control flow chart as shown in Figure 2, electric mistake can be both realized
Journey, it is specific as follows：
In the present embodiment first after television set or display are powered, master chip completes reset initialization, and master chip is opened
Control pin output cut-off signals (low level=0V) are closed, master chip sets the time M of shut-off, cut-off signals warp by plug-in
After the delay filtering for crossing first resistor R1, second resistance R2 partial pressures and the first electric capacity C1, driving triode Q1 ground level is output to,
Because cut-off signals are low level, therefore triode Q1 is not turned on, triode Q1 current collection extremely high-impedance state, thus 3rd resistor
No current on R3 and the 4th resistance R4, so driving field-effect transistor Q2 grid is identical with the level of source electrode, field-effect is brilliant
Body pipe Q2 is not turned on, and (functional module includes LCD TV or the TCON processing modules in display and MEMC processing to functional module
Module etc.) unpowered input, after LCD TV complete machine is started shooting, the switch control pin output pulse width control signal of master chip is (low
Level=0V, high level=3.3V), master chip sets the time N of conducting by plug-in, when pulse-width control signal is high electricity
Usually, through first resistor R1, second resistance R2 and the first electric capacity C1, so that triode Q1 saturation conductions, triode Q1 collection
Electrode is low resistive state and level is essentially 0V, now has electric current to lead on 3rd resistor R3, the 4th resistance R4 and the 3rd electric capacity C3
Cross, wherein the 3rd electric capacity C3 and the 4th resistance R4 is integrating circuit, play delay field-effect transistor Q2 grid and source voltage
The effect of foundation, so that field-effect transistor Q2 conductings slow down, when the 3rd electric capacity C3 charging completes, then partial pressure is only by the 3rd electricity
Hinder R3 and the 4th resistance R4 to complete, field-effect transistor Q2 grid and the Vgs voltages of source electrode reach that conducting is required, so as to produce
Functional module (functional module includes LCD TV or TCON processing modules and MEMC processing modules in display etc.) power supply is defeated
Enter, secondly, by setting the second electric capacity C2 and the 4th electric capacity C4, filtered so as to be powered respectively to input power and functional module
Ripple.
Then detect that (functional module includes the TCON in LCD TV or display and handles mould functional module by oscillograph
Block and MEMC processing modules etc.) supply voltage and electric current, if voltage and current is not reaching to functional module (Functional Module
The specification requirement of TCON processing modules and MEMC processing modules in LCD TV or display etc. is included, passes through journey built in master chip
Sequence can reset the time M of shut-off and the time N of conducting numerical value, until the voltage and current of power supply reaches functional module
(functional module includes the specification requirement of LCD TV or TCON processing modules and MEMC processing modules in display etc., so that
It is electric in completion, LCD TV complete machine start completion, so as to eliminate voltage when complete machine internal signal functional module starts upper electricity, electric current
Exceeded phenomenon.
The plug-in of master chip is specific as follows in the present embodiment：
The essence of the present invention is described in detail above embodiment, but can not be to protection scope of the present invention
Limited, it should be apparent that, under the enlightenment of the present invention, the art those of ordinary skill can also carry out many improvement
And modification, it should be noted that these are improved and modification all falls within the claims of the present invention.
Claims (2)
- Voltage and current exceeded circuit when 1. a kind of elimination semiotic function module starts upper electricity, it is characterised in thatIt includes master chip, switching signal control circuit and power switch drive circuit, the master chip, switching signal control electricity Road and the power supply drive circuit that opens the light are sequentially connected electrically；The switching signal control circuit is made up of first resistor R1, second resistance R2, the first electric capacity C1 and triode Q1, described First resistor R1 one end is electrically connected with the switch control pin of master chip, and the other end of the first resistor R1 is electric with second respectively Hinder the base stage electrical connection of R2 one end, the first electric capacity C1 one end and triode Q1, the other end ground connection of the resistance R2, institute State resistance C1 other end ground connection, the grounded emitter of the triode Q1；The power switch drive circuit is by 3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3 and field-effect transistor Q2, institute The one end for stating the 4th resistance R4 is electrically connected with triode Q1 colelctor electrode, and the other end of the 4th resistance R4 is electric with the 3rd respectively The grid electrical connection of R3 one end, the 3rd electric capacity C3 one end and field-effect transistor Q2 is hindered, the 3rd electric capacity C3's is another One end is electrically connected with the 3rd resistor R3 other end and field-effect transistor Q2 source electrode respectively.
- Voltage and current exceeded circuit when 2. elimination semiotic function module according to claim 1 starts upper electricity, it is special Levy and be, in addition to the second electric capacity C2 and the 4th electric capacity C4, the second electric capacity C2 one end ground connection, the second electric capacity C2's is another The other end and power electric connection of one end respectively with 3rd resistor R3, one end ground connection of the 4th electric capacity C4, the 4th electricity The other end drain electrode respectively with field-effect transistor Q2 and functional module supply input interface for holding C4 are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245301.4A CN107040738B (en) | 2017-04-14 | 2017-04-14 | Circuit for eliminating voltage and current exceeding standard when signal functional module starts power-on |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245301.4A CN107040738B (en) | 2017-04-14 | 2017-04-14 | Circuit for eliminating voltage and current exceeding standard when signal functional module starts power-on |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107040738A true CN107040738A (en) | 2017-08-11 |
| CN107040738B CN107040738B (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710245301.4A Active CN107040738B (en) | 2017-04-14 | 2017-04-14 | Circuit for eliminating voltage and current exceeding standard when signal functional module starts power-on |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107527602A (en) * | 2017-09-30 | 2017-12-29 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
| CN107809228A (en) * | 2017-11-07 | 2018-03-16 | 晶晨半导体(上海)股份有限公司 | A kind of on-off circuit |
| CN111026215A (en) * | 2019-12-04 | 2020-04-17 | 深圳市优必选科技股份有限公司 | Power-on control circuit and power-on control system of steering engine |
| CN114024290A (en) * | 2021-06-25 | 2022-02-08 | 重庆康佳光电技术研究院有限公司 | Display panel power supply system and overcurrent protection method |
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| US20100287399A1 (en) * | 2009-05-11 | 2010-11-11 | Takashi Yasuda | Usb power supply circuit |
| CN103064376A (en) * | 2012-12-19 | 2013-04-24 | 迈普通信技术股份有限公司 | Concentrated power supply rack-mounted equipment function module hot plug control system |
| CN204631677U (en) * | 2015-05-28 | 2015-09-09 | 杭州华三通信技术有限公司 | A kind of power control circuit |
| CN105762781A (en) * | 2016-04-28 | 2016-07-13 | 昆山龙腾光电有限公司 | Surge current control circuit and power supply device |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100287399A1 (en) * | 2009-05-11 | 2010-11-11 | Takashi Yasuda | Usb power supply circuit |
| CN103064376A (en) * | 2012-12-19 | 2013-04-24 | 迈普通信技术股份有限公司 | Concentrated power supply rack-mounted equipment function module hot plug control system |
| CN204631677U (en) * | 2015-05-28 | 2015-09-09 | 杭州华三通信技术有限公司 | A kind of power control circuit |
| CN105762781A (en) * | 2016-04-28 | 2016-07-13 | 昆山龙腾光电有限公司 | Surge current control circuit and power supply device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107527602A (en) * | 2017-09-30 | 2017-12-29 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
| CN107527602B (en) * | 2017-09-30 | 2019-07-16 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
| CN107809228A (en) * | 2017-11-07 | 2018-03-16 | 晶晨半导体(上海)股份有限公司 | A kind of on-off circuit |
| CN111026215A (en) * | 2019-12-04 | 2020-04-17 | 深圳市优必选科技股份有限公司 | Power-on control circuit and power-on control system of steering engine |
| CN114024290A (en) * | 2021-06-25 | 2022-02-08 | 重庆康佳光电技术研究院有限公司 | Display panel power supply system and overcurrent protection method |
| CN114024290B (en) * | 2021-06-25 | 2023-06-16 | 重庆康佳光电技术研究院有限公司 | Display panel power supply system and overcurrent protection method |
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| Publication number | Publication date |
|---|---|
| CN107040738B (en) | 2020-03-17 |
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