CN109493822B - Power-on control circuit of display - Google Patents
Power-on control circuit of display Download PDFInfo
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- CN109493822B CN109493822B CN201811569032.8A CN201811569032A CN109493822B CN 109493822 B CN109493822 B CN 109493822B CN 201811569032 A CN201811569032 A CN 201811569032A CN 109493822 B CN109493822 B CN 109493822B
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- control circuit
- switch
- key
- transistor
- power supply
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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
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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
- 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
- G09G2330/021—Power management, e.g. power saving
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a display power-on control circuit, which comprises: the airborne direct-current power supply, the switch control circuit and the switch key; the onboard direct-current power supply is connected to the switch control circuit through the switch key, the switch control circuit is connected to a circuit load, the switch control circuit is controlled to be turned on or turned off through triggering of the switch key, the circuit load is powered when the switch control circuit is turned on, and the circuit load is powered off when the switch control circuit is turned off. The invention can realize the on-off of the display power supply.
Description
Technical Field
The invention relates to display power-on control, in particular to a display power-on control circuit.
Background
The military aviation liquid crystal display is generally externally connected with a 28V power supply as a system power supply, and a switch on a key light guide plate is required to control a power switch of the display. The power supply of the traditional display is powered on and off, the knob or the self-locking switch is used for realizing the on-off of the power supply, the volume of the knob or the self-locking switch is large, the key light guide plate is required to have large thickness, the thickness of the key light guide plate is increased, the thickness of the display is increased, and the requirements of light structure and thin thickness of the liquid crystal display of military aviation can not be met. The invention provides a circuit for realizing power-on and power-off of a display by using a common non-self-locking key as a power control switch on a key light guide plate, and the switch key on the key light guide plate can be selected from common non-self-locking keys with the same type as other function keys to realize power-on and power-off of the display.
Disclosure of Invention
The invention aims to provide a power-on control circuit of a display, which overcomes the problems that the whole thickness of the display is larger and the requirements of light structure and thin thickness of the conventional military aviation liquid crystal display cannot be met because a self-locking switch or a knob with larger volume is adopted as a display switch for a display key light guide plate in the prior art, and realizes the on-off of a display power supply by controlling the switch of a power supply loop by using the trigger level of a non-self-locking key with small volume and thickness.
In order to achieve the above object, the present invention provides a display power-on control circuit, including: the airborne direct-current power supply, the switch control circuit and the switch key; the onboard direct-current power supply is connected to the switch control circuit through the switch key, the switch control circuit is connected to a circuit load, the switch control circuit is controlled to be turned on or turned off through triggering of the switch key, the circuit load is powered when the switch control circuit is turned on, and the circuit load is powered off when the switch control circuit is turned off.
Preferably, the on-board dc power supply is a 28V dc power supply.
Preferably, the switch control circuit includes: the key latch chip U1, the transistor Q2, the MOS tube Q1 and the MOS tube Q3; the key latch chip U1, the transistor Q2, the MOS transistor Q1 and the MOS transistor Q3; a 5 th pin of the key latch chip U1 is connected to the switch key, and a 7 th pin of the key latch chip U1 is connected to the gate of the MOS transistor Q3; the gate and the source of the MOS transistor Q3 are connected across a resistor R9, the drain of the MOS transistor Q3 is connected with one ends of resistors R7 and R8, the other end of the resistor R7 is connected with an onboard direct-current power supply, and the other end of the resistor R8 is connected with the base of a transistor Q2; an onboard direct-current power supply is connected to the drain electrode of an MOS tube Q1 after passing through a filter capacitor C4, the drain electrode of the MOS tube Q1 is connected in series with resistors R5 and R6 and is connected to the collector electrode of the transistor Q2, the grid electrode of the MOS tube Q1 is connected between the resistors R5 and R6, a voltage stabilizing diode D1 is connected between the grid electrode and the source electrode of the MOS tube Q1 in a bridging manner, and the source electrode of the MOS tube Q1 is connected with a load after passing through the filter capacitor C5; the triggering condition of the switch key controls the output of a 7 th pin of the key latch chip U1, and the output of the 7 th pin of the key latch chip U1 controls the on or off of the MOS transistor Q3; the on or off of the MOS transistor Q3 controls the off or on of the transistor Q2; the turning-off or turning-on of the transistor Q2 controls the voltage difference between the gate and the source of the MOS transistor Q1, thereby controlling the turning-on or turning-off of the MOS transistor Q1.
According to the technical scheme, the common non-self-locking key can be used as a switch key of the key light guide plate switch to control the power-on switch of the display, so that the key light guide plate of the display can be thinner, and the structural design difficulty is reduced; compared with a circuit for detecting the key state by using a microcontroller to control a power switch, the circuit has the advantages of simple structural design and lower cost; the circuit can realize extremely low power consumption of the standby display, the power consumption of the whole circuit in the standby state is about the power consumption of the chip U1 in the standby operation, and the current of the chip in the operation state is as low as 1.2uA, so the power consumption of the whole circuit is extremely low.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram illustrating the operation of a power-on control circuit for a display in accordance with the present invention;
FIG. 2 is a circuit diagram illustrating a key latch chip U1 of a power-on control circuit for a display according to the present invention;
fig. 3 is a circuit diagram illustrating a transistor Q2, a MOS transistor Q1, and a MOS transistor Q3 of a power-on control circuit for a display according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a display power-on control circuit, which comprises: the airborne direct-current power supply, the switch control circuit and the switch key; the onboard direct-current power supply is connected to the switch control circuit through the switch key, the switch control circuit is connected to a circuit load, the switch control circuit is controlled to be turned on or turned off through triggering of the switch key, the circuit load is powered when the switch control circuit is turned on, and the circuit load is powered off when the switch control circuit is turned off.
1, the working principle of the invention is as follows:
as shown in fig. 2, the switch control circuit is mainly composed of a key latch chip U1 and a transistor Q2,
Under the condition that the switch key is not triggered, a pin 7 of the U1 outputs a high level (the amplitude follows the U1 power supply voltage +28V _ IN) to turn on the MOS transistor Q3, the MOS transistor Q3 is conducted, the base of the transistor Q2 is pulled to the ground, the transistor Q2 cannot be conducted, the grid of the MOS transistor Q1 is the same as the source potential, the Q1 cannot be conducted, and the externally input 28V power cannot be output to a load.
After the switch key is pressed and released, a pin 7 of the U1 outputs a low level (the amplitude is close to the power ground), the MOS tube Q3 cannot be opened, the voltage division network formed by the resistors R7 and R6 opens the transistor Q2, the transistor Q2 is conducted, the collector of the transistor Q2 has current flowing, the voltage division network formed by the resistors R5 and R6 opens the MOS tube Q1, and the 28V power input from the outside is output to the load.
The resistors R1 and R4 form a voltage division network for power failure reset of the chip U1, and the chip is timely reset when the external power supply voltage is too low; the diode D1 is connected between the grid and the source of the MOS tube to protect the MOS tube Q1 from being damaged by high voltage.
2, selecting model descriptions of device parameters:
the chip U1 is LTC2955ITS8-2 key latch chip of Linear company; the invention is not limited to the use of chips of this type having the same or similar functionality;
q2 selects an N-channel MOS tube; q1 selects a power type P channel MOS tube, the power size of which is selected according to the use requirement;
the diode D1 is a voltage stabilizing diode, and the voltage stabilizing value of the diode D1 should be referred to the maximum voltage born by the grid-source electrode of the Q1;
the structure of the invention is as shown in figure 1, a key light guide plate is arranged on a display panel, a switch key is arranged on the key light guide plate, the switch key adopts a non-self-locking key, two lead ends are led out of the switch key, the lead end 1 is grounded, and the lead end 2 is connected with a switch control circuit in a display power panel. An external onboard 28V direct-current power supply is connected to a switch circuit on a power panel of the display, after a switch key is pressed and released for triggering, the end 2 of a lead wire equivalently outputs a pulse signal, the signal is captured by the switch circuit to control the switch circuit to be turned on, and the 28V power supply is output to a load end; after the switch key is triggered again, the end of the lead 2 outputs a pulse signal again to control the switch circuit to be closed, and the 28V power supply cannot be output to the load.
In a preferred embodiment of the present invention, the on-board dc power supply is a 28V dc power supply.
In a preferred embodiment of the present invention, the switch control circuit includes: the key latch chip U1, the transistor Q2, the MOS tube Q1 and the MOS tube Q3; a 5 th pin of the key latch chip U1 is connected to the switch key, and a 7 th pin of the key latch chip U1 is connected to the gate of the MOS transistor Q3; the gate-source electrode of the MOS transistor Q3 is connected with a resistor R9 in a crossing manner, the drain electrode of the MOS transistor Q3 is connected with one ends of resistors R7 and R8, the other end of the resistor R7 is connected with an onboard direct-current power supply, and the other end of the resistor R8 is connected with the base electrode of a transistor Q2; an onboard direct-current power supply is connected to the drain electrode of an MOS tube Q1 after passing through a filter capacitor C4, the drain electrode of the MOS tube Q1 is connected in series with resistors R5 and R6 and is connected to the collector electrode of the transistor Q2, the grid electrode of the MOS tube Q1 is connected between the resistors R5 and R6, a voltage-stabilizing diode D1 is connected between the grid electrode and the source electrode of the MOS tube Q1 in a bridging mode, and the source electrode of the MOS tube Q1 is connected with a load after passing through the filter capacitor C5; the triggering condition of the switch key controls the output of a 7 th pin of the key latch chip U1, and the output of the 7 th pin of the key latch chip U1 controls the on or off of the MOS transistor Q3; the on or off of the MOS transistor Q3 controls the off or on of the transistor Q2; the turning-off or turning-on of the transistor Q2 controls the voltage difference between the gate and the source of the MOS transistor Q1, thereby controlling the turning-on or turning-off of the MOS transistor Q1.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (2)
1. A display power-on control circuit, comprising: the airborne direct-current power supply, the switch control circuit and the switch key; the onboard direct-current power supply is connected to the switch control circuit through the switch key, the switch control circuit is connected to a circuit load, the switch control circuit is controlled to be turned on or turned off through triggering of the switch key, the circuit load is powered when the switch control circuit is turned on, and the circuit load is powered off when the switch control circuit is turned off;
the switch control circuit includes: the key latch chip U1, the transistor Q2, the MOS tube Q1 and the MOS tube Q3; a 5 th pin of the key latch chip U1 is connected to the switch key, and a 7 th pin of the key latch chip U1 is connected to the gate of the MOS transistor Q3; the grid and the source of the MOS transistor Q3 are connected across the resistor R9, the drain of the MOS transistor Q3 is connected with one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R7 is connected with an onboard direct-current power supply, and the other end of the resistor R8 is connected with the base of the transistor Q2; the airborne direct-current power supply is connected to a source electrode of an MOS transistor Q1 after passing through a filter capacitor C4, a collector electrode of the transistor Q2 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a resistor R5 in series, and the other end of the resistor R5 is connected with the airborne direct-current power supply; the gate of the MOS transistor Q1 is connected between the resistors R5 and R6, the gate of the MOS transistor Q1 is connected to the anode of the zener diode D1, and the source of the MOS transistor Q1 is connected to the cathode of the zener diode D1; the drain electrode of the MOS tube Q1 is connected with a load after passing through a filter capacitor C5; the triggering condition of the switch key controls the output of a 7 th pin of the key latch chip U1, and the output of the 7 th pin of the key latch chip U1 controls the on or off of the MOS transistor Q3; the on or off of the MOS transistor Q3 controls the off or on of the transistor Q2; the turning-off or turning-on of the transistor Q2 controls the voltage difference between the gate and the source of the MOS transistor Q1, thereby controlling the turning-on or turning-off of the MOS transistor Q1.
2. The power-on control circuit for display of claim 1, wherein the on-board dc power supply is a 28V dc power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569032.8A CN109493822B (en) | 2018-12-21 | 2018-12-21 | Power-on control circuit of display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569032.8A CN109493822B (en) | 2018-12-21 | 2018-12-21 | Power-on control circuit of display |
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| Publication Number | Publication Date |
|---|---|
| CN109493822A CN109493822A (en) | 2019-03-19 |
| CN109493822B true CN109493822B (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811569032.8A Active CN109493822B (en) | 2018-12-21 | 2018-12-21 | Power-on control circuit of display |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116192113A (en) * | 2022-12-23 | 2023-05-30 | 湖北华中长江光电科技有限公司 | Microminiature and ultra-low power consumption key trigger control circuit and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871346A (en) * | 2012-12-12 | 2014-06-18 | 三星显示有限公司 | Display device and driving method thereof |
| CN104202029A (en) * | 2014-08-29 | 2014-12-10 | 青岛歌尔声学科技有限公司 | Single-button power-on and power-off circuit and head-wearing display device |
| CN204567161U (en) * | 2015-03-24 | 2015-08-19 | 中山市六源通电子科技有限公司 | There is the tire pressure telltale of power on/off function |
| CN108509036A (en) * | 2018-03-22 | 2018-09-07 | 四川斐讯信息技术有限公司 | It is a kind of based on all touch screen curtain and the electronic equipment without button and its control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102353514B1 (en) * | 2015-05-18 | 2022-01-20 | 삼성전자 주식회사 | Method for controlling power supply and electronic device implementing the same |
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2018
- 2018-12-21 CN CN201811569032.8A patent/CN109493822B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103871346A (en) * | 2012-12-12 | 2014-06-18 | 三星显示有限公司 | Display device and driving method thereof |
| CN104202029A (en) * | 2014-08-29 | 2014-12-10 | 青岛歌尔声学科技有限公司 | Single-button power-on and power-off circuit and head-wearing display device |
| CN204567161U (en) * | 2015-03-24 | 2015-08-19 | 中山市六源通电子科技有限公司 | There is the tire pressure telltale of power on/off function |
| CN108509036A (en) * | 2018-03-22 | 2018-09-07 | 四川斐讯信息技术有限公司 | It is a kind of based on all touch screen curtain and the electronic equipment without button and its control method |
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| Publication number | Publication date |
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| CN109493822A (en) | 2019-03-19 |
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