CN107040738B - Circuit for eliminating voltage and current exceeding standard when signal functional module starts power-on - Google Patents
Circuit for eliminating voltage and current exceeding standard when signal functional module starts power-on Download PDFInfo
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- CN107040738B CN107040738B CN201710245301.4A CN201710245301A CN107040738B CN 107040738 B CN107040738 B CN 107040738B CN 201710245301 A CN201710245301 A CN 201710245301A CN 107040738 B CN107040738 B CN 107040738B
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- resistor
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- triode
- electrically connected
- effect transistor
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- 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
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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
- H03K17/51—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
The invention discloses a circuit for eliminating the exceeding of voltage and current when a signal function module is started to be electrified, which is characterized by comprising a main chip, a switch signal control circuit and a power supply switch driving circuit, wherein the main chip, the switch signal control circuit and the power supply switch driving circuit are sequentially and electrically connected.
Description
Technical Field
The invention relates to the technical field of televisions, in particular to a circuit for eliminating overproof voltage and current when a signal function module is started and electrified.
Background
At present, the functions of a liquid crystal television or a display are more and more complex, and more functional modules are adopted inside the liquid crystal television or the display, such as wireless communication, 3D processing, TCON processing, MEMC processing and the like; each module has the stability requirements of power supply voltage and current for starting, and although the conventional power supply module has a voltage feedback stabilizing circuit, the situation that the voltage and the current temporarily exceed standards still occurs at the moment of electrifying the functional module during starting, and when the voltage and the current exceed the bearing range of the module, the abnormal operation of the module or the damage of devices is possibly caused.
Disclosure of Invention
The invention overcomes the defect that a voltage feedback stabilizing circuit in the prior art is easy to cause module work abnormity or device damage, and provides a circuit for eliminating the exceeding of voltage and current when a signal function module is started and powered on, wherein the circuit can eliminate the condition that the supply voltage and the current momentarily exceed the standard at the moment that each independent work function module is powered on when the circuit is started.
In order to solve the technical problems, the invention adopts the following technical scheme:
a circuit for eliminating the voltage and current exceeding standards when a signal function module is started to be electrified comprises a main chip, a switch signal control circuit and a power supply switch driving circuit, wherein the main chip, the switch signal control circuit and the power supply switch driving circuit are electrically connected in sequence;
the switching signal control circuit consists of a first resistor R1, a second resistor R2, a first capacitor C1 and a triode Q1, wherein one end of the first resistor R1 is electrically connected with a switching control pin of a main chip, the other end of the first resistor R1 is respectively electrically connected with one end of a second resistor R2, one end of a first capacitor C1 and a base electrode of the triode Q1, the other end of the resistor R2 is grounded, the other end of the resistor C1 is grounded, and an emitter of the triode Q1 is grounded;
the power supply switch driving circuit is composed of a third resistor R3, a fourth resistor R4, a third capacitor C3 and a field effect transistor Q2, one end of the fourth resistor R4 is electrically connected with a collector of a triode Q1, the other end of the fourth resistor R4 is electrically connected with one end of the third resistor R3, one end of the third capacitor C3 and a gate of the field effect transistor Q2, and the other end of the third capacitor C3 is electrically connected with the other end of the third resistor R3 and a source of the field effect transistor Q2.
The technical scheme is that the power supply circuit further comprises a second capacitor C2 and a fourth capacitor C4, one end of the second capacitor C2 is grounded, the other end of the second capacitor C2 is electrically connected with the other end of the third resistor R3 and a power supply respectively, one end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is electrically connected with the drain of the field effect transistor Q2 and the power supply input interface of the functional module respectively.
According to the technical scheme, the switch signal control circuit and the power supply switch driving circuit are added on the power supply circuit of the functional module of the original liquid crystal television or display, soft start on-off control of the switch signal control circuit is realized through a switch control pin on a main chip of the liquid crystal television or display through a built-in program of the main chip, and the phenomenon that the voltage and the current exceed the standard when the signal functional module inside the whole machine is started and powered on is eliminated under the condition that fewer materials and less cost are added.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the gradual increase of the power supply voltage and current of the functional module of the liquid crystal television or the display, solves the problem of overproof voltage and current caused by the instant electrification of the functional module and achieves the aim of avoiding the abnormal operation of the module or the damage of devices caused by the electrification starting.
Drawings
Fig. 1 is a schematic diagram of a circuit for eliminating voltage and current overproof when a signal function module starts power-on according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating control of a power-on switch of the functional module according to an embodiment of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawing.
As shown in fig. 1, a circuit for eliminating the exceeding of voltage and current when a signal function module is powered on comprises a main chip, a switch signal control circuit and a power supply switch driving circuit, wherein the main chip, the switch signal control circuit and the power supply switch driving circuit are electrically connected in sequence; the switching signal control circuit consists of a first resistor R1, a second resistor R2, a first capacitor C1 and a triode Q1, wherein one end of the first resistor R1 is electrically connected with a switching control pin of a main chip, the other end of the first resistor R1 is respectively electrically connected with one end of a second resistor R2, one end of a first capacitor C1 and a base electrode of the triode Q1, the other end of the resistor R2 is grounded, the other end of the resistor C1 is grounded, and an emitter of the triode Q1 is grounded; the power supply switch driving circuit is composed of a third resistor R3, a fourth resistor R4, a third capacitor C3 and a field effect transistor Q2, one end of the fourth resistor R4 is electrically connected with a collector of a triode Q1, the other end of the fourth resistor R4 is electrically connected with one end of the third resistor R3, one end of the third capacitor C3 and a gate of the field effect transistor Q2, and the other end of the third capacitor C3 is electrically connected with the other end of the third resistor R3 and a source of the field effect transistor Q2.
Meanwhile, the circuit further comprises a second capacitor C2 and a fourth capacitor C4, one end of the second capacitor C2 is grounded, the other end of the second capacitor C2 is electrically connected with the other end of the third resistor R3 and a power supply respectively, one end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is electrically connected with the drain electrode of the field effect transistor Q2 and the power supply input interface of the functional module respectively.
Meanwhile, through the control flow chart of the power-on switch of the functional module shown in fig. 2, the power-on process can be realized, which specifically includes the following steps:
in this embodiment, first, when the television or the display is powered on, the main chip completes reset initialization, the switch control pin of the main chip outputs a turn-off signal (low level is 0V), the main chip sets a turn-off time M through a built-in program, the turn-off signal is output to the base stage of the driving transistor Q1 after being subjected to voltage division by the first resistor R1, the second resistor R2 and delay filtering by the first capacitor C1, the transistor Q1 is not turned on because the turn-off signal is low level, and the collector of the transistor Q1 is in a high-resistance state, so that no current flows through the third resistor R3 and the fourth resistor R4, so that the gate and the source of the driving transistor Q2 have the same level, the field-effect transistor Q2 is not turned on, the function module (the function module includes a TCON processing module and a MEMC processing module in the liquid crystal television or the display) has no power input, and when the entire liquid crystal television is powered on, the switch control pin of the main chip outputs a pulse width control signal (low level is, 3.3V), the main chip sets the conducting time N through the built-in program, when the pulse width control signal is high level, the transistor Q1 is saturated and conducted through the first resistor R1, the second resistor R2 and the first capacitor C1, the collector of the transistor Q1 is in low resistance state and the level is substantially 0V, at this time, the current passes through the third resistor R3, the fourth resistor R4 and the third capacitor C3, wherein the third capacitor C3 and the fourth resistor R4 are integrated circuits, which play a role of delaying the establishment of the gate and source voltages of the transistor Q2, so as to make the transistor Q2 conducting and slow down, when the third capacitor C3 is charged, the voltage division is completed only by the third resistor R3 and the fourth resistor R4, the Vgs voltages of the gate and the source of the transistor Q2 reach the conducting requirement, so as to generate the functional module (the functional module includes TCON or TCON processing module and MEMC) of the tv set in the display) and the input processing module, secondly, a second capacitor C2 and a fourth capacitor C4 are arranged, so that the input power supply and the power supply of the functional module are filtered respectively.
And then detecting the power supply voltage and current of a functional module (the functional module comprises a TCON processing module, an MEMC processing module and the like in the liquid crystal television or the display) through an oscilloscope, if the voltage and current do not meet the specification requirements of the functional module (the functional module comprises the TCON processing module, the MEMC processing module and the like in the liquid crystal television or the display), resetting the numerical values of the turn-off time M and the turn-on time N through a built-in program of a main chip until the power supply voltage and current reach the specification requirements of the functional module (the functional module comprises the TCON processing module, the MEMC processing module and the like in the liquid crystal television or the display), thereby completing power supply, completing the complete machine start of the liquid crystal television, and eliminating the phenomenon that the voltage and the current exceed the standard when the signal functional module in the complete machine starts power supply.
The built-in program of the main chip in this embodiment is specifically as follows:
the above detailed description illustrates the essence of the present invention in detail, but does not limit the scope of the present invention, and obviously many modifications and modifications may be made by those skilled in the art in light of the present disclosure, and it should be noted that these modifications and modifications fall within the scope of the present invention as defined in the appended claims.
Claims (2)
1. A circuit for eliminating the overproof voltage and current when a signal function module is started to be electrified is characterized by comprising a main chip, a switch signal control circuit and a power supply switch driving circuit, wherein the main chip, the switch signal control circuit and the power supply switch driving circuit are electrically connected in sequence;
the switching signal control circuit consists of a first resistor R1, a second resistor R2, a first capacitor C1 and a triode Q1, wherein one end of the first resistor R1 is electrically connected with a switching control pin of a main chip, the other end of the first resistor R1 is respectively electrically connected with one end of a second resistor R2, one end of a first capacitor C1 and a base electrode of the triode Q1, the other end of the resistor R2 is grounded, the other end of the resistor C1 is grounded, and an emitter of the triode Q1 is grounded;
the power supply switch driving circuit comprises a third resistor R3, a fourth resistor R4, a third capacitor C3 and a field effect transistor Q2, wherein one end of the fourth resistor R4 is electrically connected with a collector of a triode Q1, the other end of the fourth resistor R4 is electrically connected with one end of the third resistor R3, one end of the third capacitor C3 and a gate of the field effect transistor Q2 respectively, and the other end of the third capacitor C3 is electrically connected with the other end of the third resistor R3 and a source of the field effect transistor Q2 respectively;
the main chip sets the turn-off time M through a built-in program, a turn-off signal is divided by a first resistor R1 and a second resistor R2 and is output to a base level of a triode Q1 after being delayed and filtered by a first capacitor C1, when the turn-off signal is at a low level, the triode Q1 is not conducted, a collector of the triode Q1 is in a high-resistance state, no current exists on a third resistor R3 and a fourth resistor R4, the levels of a grid electrode and a source electrode of a driving field effect transistor Q2 are the same, and the field effect transistor Q2 is not conducted; when the main chip sets the conducting time N through a built-in program, when a pulse width control signal is at a high level, the triode Q1 is conducted in a saturated mode through the first resistor R1, the second resistor R2 and the first capacitor C1, the collector of the triode Q1 is in a low-resistance state, the level is 0V, at the moment, current passes through the third resistor R3, the fourth resistor R4 and the third capacitor C3, an integration circuit formed by the third capacitor C3 and the fourth resistor R4 delays the establishment of the grid voltage and the source voltage of the field effect transistor Q2, the conduction of the field effect transistor Q2 is slowed down, when the third capacitor C3 is charged, voltage division is completed only through the third resistor R3 and the fourth resistor R4, and Vgs voltage of the grid voltage and the source voltage of the field effect transistor Q2 reaches the conducting requirement.
2. The circuit for eliminating voltage and current overproof during power-on of signal functional module according to claim 1, further comprising a second capacitor C2 and a fourth capacitor C4, wherein one end of the second capacitor C2 is grounded, the other end of the second capacitor C2 is electrically connected to the other end of the third resistor R3 and the power supply, respectively, one end of the fourth capacitor C4 is grounded, and the other end of the fourth capacitor C4 is electrically connected to the drain of the field effect transistor Q2 and the power supply input interface of the functional module, respectively.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN107040738A CN107040738A (en) | 2017-08-11 |
| CN107040738B true CN107040738B (en) | 2020-03-17 |
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| 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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 | Priority date | Publication date | Assignee | Title |
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| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010263730A (en) * | 2009-05-11 | 2010-11-18 | Funai Electric Co Ltd | Usb power supply circuit |
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- 2017-04-14 CN CN201710245301.4A patent/CN107040738B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN107040738A (en) | 2017-08-11 |
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