CN117134292A - Safety protection circuit of display screen - Google Patents
Safety protection circuit of display screen Download PDFInfo
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- CN117134292A CN117134292A CN202311393538.9A CN202311393538A CN117134292A CN 117134292 A CN117134292 A CN 117134292A CN 202311393538 A CN202311393538 A CN 202311393538A CN 117134292 A CN117134292 A CN 117134292A
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- display screen
- module
- power supply
- voltage
- resistor
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- 238000001514 detection method Methods 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 56
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 24
- 229910052710 silicon Inorganic materials 0.000 claims description 24
- 239000010703 silicon Substances 0.000 claims description 24
- 239000003381 stabilizer Substances 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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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
-
- 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
- G09G2330/027—Arrangements or methods related to powering off a display
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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
- G09G2330/04—Display protection
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a safety protection circuit of a display screen, which relates to the field of safety protection, and comprises: the voltage-stabilizing power supply module is used for providing direct current for the switch detection feedback module and the delay restarting module; the display screen power supply module is used for providing working voltage for the display screen; the switch detection feedback module is used for storing voltage through the capacitive device in the process of supplying power and powering off the display screen by the display screen power supply module, and outputting the stored voltage when the stored voltage exceeds a set threshold value; compared with the prior art, the invention has the beneficial effects that: the invention is provided with the switch detection feedback module, when the display screen is started and shut down for a plurality of times in a short time, the information is collected and fed back to the on-off control module, and the on-off control module further cuts off a power supply loop of the display screen, so that the service life of the display screen is prevented from being reduced; and when the on-off control module works, the delay restarting module is driven, and after the delay, the power supply loop of the display screen is restored again.
Description
Technical Field
The invention relates to the field of safety protection, in particular to a safety protection circuit of a display screen.
Background
The display screen is used for receiving communication signals, distributing sharing information in a multimedia form, and displaying text, forms and video image information according to the divided areas.
When the display screen is normally used, the display screen is not frequently turned on and off, but the display screen is turned on and off for many times in a short time under the conditions of abnormal power supply or playing by children, and the display screen is discharged by the inner high-voltage bag when being started, if the display screen is frequently turned on and off, the kinescope of the display screen is extremely unfavorable, and the service life of the kinescope can be greatly shortened.
Therefore, corresponding protection measures are required for switching on and off the display screen for a plurality of times in a short time.
Disclosure of Invention
The present invention is directed to a safety protection circuit for a display screen, so as to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a security protection circuit for a display screen, comprising:
the voltage-stabilizing power supply module is used for providing direct current for the switch detection feedback module and the delay restarting module;
the display screen power supply module is used for providing working voltage for the display screen;
the switch detection feedback module is used for detecting whether the display screen power supply module supplies power to the display screen or not, and when the power supply and the power supply exist for one time, the voltage is stored through the capacitive device, and the voltage stored by the capacitive device is consumed through a load; when the storage voltage of the capacitive device exceeds a set threshold value in the power supply and power off processes of the display screen, a control signal is fed back to drive the on-off control module to work;
the on-off control module is used for controlling the display screen power supply module to stop working when working and simultaneously driving the delay restarting module;
the delay restarting module is used for disconnecting the voltage loop of the display screen power supply module after the working delay, and then recovering the voltage loop of the display screen power supply module;
the output end of the voltage-stabilizing power supply module is connected with the first input end of the switch detection feedback module and the first input end of the delay restarting module, the output end of the display screen power supply module is connected with the second input end of the switch detection feedback module, the output end of the switch detection feedback module is connected with the input end of the on-off control module, the output end of the on-off control module is connected with the first input end of the display screen power supply module and the second input end of the delay restarting module, and the output end of the delay restarting module is connected with the second input end of the display screen power supply module.
As still further aspects of the invention: the voltage-stabilizing power supply module comprises a first resistor, a first capacitor, a voltage stabilizer and a second capacitor, wherein one end of the first resistor is connected with a first voltage, the other end of the first resistor is connected with the input end of the voltage stabilizer and one end of the first capacitor, the other end of the first capacitor is grounded, the grounding ground of the voltage stabilizer is connected with one end of the second capacitor, the output end of the voltage stabilizer is connected with the first input end of the switch detection feedback module and the first input end of the delay restarting module, and the other end of the second capacitor is grounded.
As still further aspects of the invention: the display screen power supply module comprises a first switch, a first MOS tube and a second switch, wherein one end of the first switch is connected with a first voltage, the other end of the first switch is connected with an S pole of the first MOS tube, the G pole of the first MOS tube is connected with the output end of the on-off control module, the D pole of the first MOS tube is connected with one end of the second switch, the other end of the second switch is connected with one end of the display screen, the second input end of the switch detection feedback module, and the other end of the display screen is grounded.
As still further aspects of the invention: the switch detection feedback module comprises:
the switch detection unit is used for detecting whether the display screen power supply module supplies power and cuts off power for the display screen, and charging the feedback unit once every time the power is supplied and cut off;
the feedback unit is used for driving the on-off control module to work when the storage voltage of the capacitive device in the feedback unit exceeds a set threshold value, and the on-off control module can discharge after charging and only charge for a plurality of times in a short time, and the storage voltage of the capacitive device in the feedback unit exceeds the set threshold value;
the first input end of the switch detection unit is connected with the output end of the voltage-stabilizing power supply module, the second input end of the switch detection unit is connected with the output end of the display screen power supply module, the output end of the switch detection unit is connected with the input end of the feedback unit, and the output end of the feedback unit is connected with the input end of the on-off control module.
As still further aspects of the invention: the switch detection unit comprises a fifth resistor, a third MOS tube, a fourth MOS tube, a second silicon controlled rectifier, a fourth resistor, a third diode and a fifth capacitor, wherein the S pole of the fourth MOS tube is connected with the output end of the voltage-stabilizing power supply module, one end of the fifth resistor is connected with the output end of the display screen power supply module, the other end of the fifth resistor is connected with the G pole of the third MOS tube and the control pole of the second silicon controlled rectifier, the S pole of the third MOS tube is connected with the negative pole of the second silicon controlled rectifier, the positive pole of the second silicon controlled rectifier is connected with the D pole of the fourth MOS tube, the D pole of the third MOS tube is connected with one end of the fourth resistor, one end of the fifth capacitor and the negative pole of the third diode, the other end of the fourth resistor is grounded, and the positive pole of the third diode is connected with the input end of the feedback unit and the G pole of the fourth MOS tube.
As still further aspects of the invention: the feedback unit comprises a second diode, a third resistor and a fourth capacitor, wherein the positive electrode of the second diode is connected with the output end of the switch detection unit, the negative electrode of the second diode is connected with one end of the third resistor, one end of the fourth capacitor and the input end of the on-off control module, the other end of the third resistor is grounded, and the other end of the fourth capacitor is grounded.
As still further aspects of the invention: the on-off control module comprises a sixth resistor and a first silicon controlled rectifier, one end of the sixth resistor is connected with the S pole of the first MOS tube, the other end of the sixth resistor is connected with the positive pole of the first silicon controlled rectifier, the negative pole of the first silicon controlled rectifier is connected with the second input end of the delay restarting module and the first input end of the display screen power supply module, and the control pole of the first silicon controlled rectifier is connected with the output end of the switch detection feedback module.
As still further aspects of the invention: the delay restarting module comprises a second resistor, a first potentiometer, a third capacitor, a second MOS tube, a first relay and a first diode, wherein one end of the first relay is connected with the negative electrode of the first diode and the output end of the voltage-stabilizing power supply module, the other end of the first relay is connected with the positive electrode of the first diode and the D electrode of the second MOS tube, the S electrode of the second MOS tube is grounded, the G electrode of the second MOS tube is connected with one end of the third capacitor and one end of the first potentiometer, the other end of the third capacitor is grounded, the other end of the first potentiometer is connected with one end of the second resistor, and the other end of the second resistor is connected with the output end of the on-off control module.
Compared with the prior art, the invention has the beneficial effects that: the invention is provided with the switch detection feedback module, when the display screen is started and shut down for a plurality of times in a short time, the information is collected and fed back to the on-off control module, and the on-off control module further cuts off a power supply loop of the display screen, so that the service life of the display screen is prevented from being reduced; and when the on-off control module works, the delay restarting module is driven, and after the delay, the power supply loop of the display screen is restored again.
Drawings
Fig. 1 is a schematic diagram of a safety protection circuit for a display screen.
Fig. 2 is a circuit diagram of a regulated power supply module.
Fig. 3 is a circuit diagram of a display screen power supply module, an on-off control module and a delay restarting module.
Fig. 4 is a circuit diagram of the switch detection feedback module.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, a security protection circuit of a display screen includes:
the voltage-stabilizing power supply module 1 is used for providing direct current for the switch detection feedback module 3 and the delay restarting module 5;
the display screen power supply module 2 is used for providing working voltage for the display screen X;
the switch detection feedback module 3 is used for detecting whether the display screen power supply module 2 supplies power to the display screen X or cuts off power, and when the power supply and the power cut-off exist for one time, the voltage is stored through the capacitive device, and the voltage stored by the capacitive device is consumed through a load; when the storage voltage of the capacitive device exceeds a set threshold value in the power supply and power off processes of the display screen X, a control signal is fed back to drive the on-off control module 4 to work;
the on-off control module 4 is used for controlling the display screen power supply module 2 to stop working and simultaneously driving the delay restarting module 5;
the delay restarting module 5 is used for firstly disconnecting the voltage loop of the display screen power supply module 2 after the working delay and then recovering the voltage loop of the display screen power supply module 2;
the output end of the voltage-stabilizing power supply module 1 is connected with the first input end of the switch detection feedback module 3 and the first input end of the delay restarting module 5, the output end of the display screen power supply module 2 is connected with the second input end of the switch detection feedback module 3, the output end of the switch detection feedback module 3 is connected with the input end of the on-off control module 4, the output end of the on-off control module 4 is connected with the first input end of the display screen power supply module 2 and the second input end of the delay restarting module 5, and the output end of the delay restarting module 5 is connected with the second input end of the display screen power supply module 2.
In this embodiment: referring to fig. 2, the regulated power supply module 1 includes a first resistor R1, a first capacitor C1, a regulator U1, and a second capacitor C2, wherein one end of the first resistor R1 is connected to a first voltage VCC, the other end of the first resistor R1 is connected to an input end of the regulator U1 and one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, the ground of the regulator U1 is grounded, an output end of the regulator U1 is connected to one end of the second capacitor C2, a first input end of the switch detection feedback module 3, a first input end of the delay restarting module 5, and the other end of the second capacitor C2 is grounded.
The first voltage VCC is input, is output to the voltage stabilizer U1 after passing through the first resistor R1, and is output to the stable voltage VDD after passing through the voltage stabilizer U1, and is supplied to the subsequent circuit.
In another embodiment: the first resistor R1 may be omitted, and the first resistor R1 is used for current limiting to prevent the device from being damaged due to a large input current.
In this embodiment: referring to fig. 3, the display screen power supply module 2 includes a first switch S1, a first MOS transistor V1, and a second switch S2, one end of the first switch S1 is connected to a first voltage VCC, the other end of the first switch S1 is connected to an S pole of the first MOS transistor V1, a G pole of the first MOS transistor V1 is connected to an output end of the on-off control module 4, a D pole of the first MOS transistor V1 is connected to one end of the second switch S2, the other end of the second switch S2 is connected to one end of the display screen X, a second input end of the switch detection feedback module 3, and the other end of the display screen X is grounded.
Under normal conditions, the first switch S1 is normally closed, the first MOS tube V1 is turned on, the second switch S2 is used as a control switch, and whether to supply power to the display screen X is controlled by controlling whether the second switch S2 is turned on or not.
In another embodiment: a capacitor can be added to ensure stable voltage output to the display screen X.
In this embodiment: referring to fig. 4, the switch detection feedback module 3 includes:
the switch detection unit is used for detecting whether the display screen power supply module 2 supplies power and cuts off power for the display screen X, and the feedback unit is charged once when the power is supplied and cut off once;
the feedback unit is used for driving the on-off control module 4 to work when the storage voltage of the capacitive device in the feedback unit exceeds a set threshold value, and the capacitive device can be discharged after being charged and only charged for a plurality of times in a short time, and the storage voltage of the capacitive device in the feedback unit exceeds the set threshold value;
the first input end of the switch detection unit is connected with the output end of the voltage-stabilizing power supply module 1, the second input end of the switch detection unit is connected with the output end of the display screen power supply module 2, the output end of the switch detection unit is connected with the input end of the feedback unit, and the output end of the feedback unit is connected with the input end of the on-off control module 4.
In this embodiment: referring to fig. 4, the switch detection unit includes a fifth resistor R5, a third MOS transistor V3, a fourth MOS transistor V4, a second thyristor Z2, a fourth resistor R4, a third diode D3, and a fifth capacitor C5, wherein an S-pole of the fourth MOS transistor V4 is connected to an output end of the regulated power supply module 1, one end of the fifth resistor R5 is connected to an output end of the display screen power supply module 2, the other end of the fifth resistor R5 is connected to a G-pole of the third MOS transistor V3, a control pole of the second thyristor Z2, an S-pole of the third MOS transistor V3 is connected to a negative pole of the second thyristor Z2, an anode of the second thyristor Z2 is connected to a D-pole of the fourth MOS transistor V4, a D-pole of the third MOS transistor V3 is connected to one end of the fourth resistor R4, a negative pole of the third diode D3, another end of the fourth resistor R4 is grounded, another end of the fifth capacitor C5 is grounded, and an anode of the third diode D3 is connected to an input end of the feedback unit, and a fourth MOS transistor V4.
After the second switch S2 is closed, charging the display screen X, wherein the common point A is high level, the second silicon controlled rectifier Z2 is triggered to be conducted through the fifth resistor R5, after the second switch S2 is opened, the charging of the display screen X is stopped, the G of the third MOS tube V3 is extremely low level, the third MOS tube V3 is conducted, the voltage VDD is output through the fourth MOS tube V4, the second silicon controlled rectifier Z2 and the third MOS tube V3, the fifth capacitor C5 stores electric energy, when the voltage is enough to conduct the third diode D3 (a voltage stabilizing diode), the voltage is charged for the output voltage of the feedback unit, meanwhile, the common point B is high level, the fourth MOS tube V4 is cut off, the charging of the fifth capacitor C5 is stopped, and the electric energy stored by the fifth capacitor C5 continues to charge the feedback unit until the third diode D3 cannot be conducted; therefore, the display screen X is turned on and off once (i.e., the second switch S2 is turned on and off once), the switch detecting unit detects the information, charges the feedback unit once, and returns to the initial state.
In another embodiment: the fourth resistor R4 may be omitted, and the fourth resistor R4 is configured to consume the voltage on the fifth capacitor C5 after the fourth MOS transistor V4 is turned off, so as to avoid that the voltage on the fifth capacitor C5 is completely supplied to the feedback unit after being divided by the loss of the third diode D3.
In this embodiment: referring to fig. 4, the feedback unit includes a second diode D2, a third resistor R3, and a fourth capacitor C4, wherein an anode of the second diode D2 is connected to an output end of the switch detection unit, a cathode of the second diode D2 is connected to one end of the third resistor R3, one end of the fourth capacitor C4, and an input end of the on-off control module 4, another end of the third resistor R3 is grounded, and another end of the fourth capacitor C4 is grounded.
When the display screen X is turned on and off once, the switch detection unit charges the feedback unit once, and the display screen X is turned on and off for a plurality of times in a short time, so that the voltage stored on the fourth capacitor C4 is large enough to drive the on-off control module 4.
In another embodiment, the third resistor R3 may be omitted, where the third resistor R3 is used to consume the voltage on the fourth capacitor C4, so as to avoid the voltage on the fourth capacitor C4 from being accumulated when the display screen X is turned on or off for a longer period of time.
In this embodiment: referring to fig. 3, the on-off control module 4 includes a sixth resistor R6 and a first silicon controlled rectifier Z1, one end of the sixth resistor R6 is connected to the S pole of the first MOS transistor V1, the other end of the sixth resistor R6 is connected to the positive pole of the first silicon controlled rectifier Z1, the negative pole of the first silicon controlled rectifier Z1 is connected to the second input end of the delay restarting module 5, the first input end of the display screen power supply module 2, and the control pole of the first silicon controlled rectifier Z1 is connected to the output end of the switch detection feedback module 3.
Frequent startup and shutdown of the display screen X in a short time causes that the voltage stored on the fourth capacitor C4, namely the voltage at the common point C, is enough to trigger the first silicon controlled rectifier Z1 to be conducted (generally 0.8V to 1.5V, depending on different models), and then high level is provided for the G pole of the first MOS tube V1, the first MOS tube V1 is cut off, the internal power supply circuit of the display screen power supply module 2 is disconnected, the power supply for the display screen X is stopped, no matter the power supply is abnormal or the child plays, the power supply for the display screen X is avoided, the display tube loss of the display screen X is avoided, and the service life is shortened.
In another embodiment: a light emitting tube may be additionally provided to indicate whether the on-off control module 4 operates.
In this embodiment: referring to fig. 3, the delay restarting module 5 includes a second resistor R2, a first potentiometer RP1, a third capacitor C3, a second MOS transistor V2, a first relay J1, a first diode D1, one end of the first relay J1 is connected to the negative pole of the first diode D1, the output end of the regulated power supply module 1, the other end of the first relay J1 is connected to the positive pole of the first diode D1, the D pole of the second MOS transistor V2, the S pole of the second MOS transistor V2 is grounded, the G pole of the second MOS transistor V2 is connected to one end of the third capacitor C3, one end of the first potentiometer RP1, the other end of the third capacitor C3 is grounded, the other end of the first potentiometer RP1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the output end of the on-off control module 4.
After the first silicon controlled rectifier Z1 is conducted, the voltage charges the third capacitor C3 through the second resistor R2 and the first potentiometer RP1, when the third capacitor C3 is charged to a high level (at the moment, the first MOS tube V1 is disconnected for enough time), the time is used as delay time, the second MOS tube V2 is conducted, the first relay J1 is powered on, the first switch S1 is controlled to be disconnected, the input voltage of the on-off control module 4 is disconnected, the on-off control module 4 stops working, the first MOS tube V1 is conducted again, the voltage on the third capacitor C3 is gradually consumed to a low level based on the disconnection of the first switch S1, the second MOS tube V2 is disconnected again, the first relay J1 stops working, the first switch S1 is closed, and the whole circuit is restored to an initial state. The user can control the display screen X to be turned on or off again by controlling the second switch S2. The user can also make a circuit restart by directly switching off the first voltage VCC.
In another embodiment: the first potentiometer RP1 can be replaced with a common resistor, which would not allow the delay time to be adjusted.
The working principle of the invention is as follows: the voltage-stabilizing power supply module 1 is used for providing direct current for the switch detection feedback module 3 and the delay restarting module 5; the display screen power supply module 2 is used for providing working voltage for the display screen X; the switch detection feedback module 3 is used for storing voltage in a capacitive device in the switch detection feedback module 3 in the process of supplying power to the display screen X and powering off the display screen X by the display screen power supply module 2; the power supply module 2 supplies power to the display screen X and cuts off power for a plurality of times in a short time, and when the storage voltage of the capacitive device in the switch detection feedback module 3 exceeds a set threshold value, the on-off control module 4 is driven to work; the on-off control module 4 is used for controlling the display screen power supply module 2 to stop working and simultaneously driving the delay restarting module 5; the delay restarting module 5 is used for disconnecting the voltage loop of the display screen power supply module 2 after the working delay, and then recovering the voltage loop of the display screen power supply module 2, and restarting the circuit.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. A safety protection circuit for a display screen, the safety protection circuit comprising:
the voltage-stabilizing power supply module is used for providing direct current for the switch detection feedback module and the delay restarting module;
the display screen power supply module is used for providing working voltage for the display screen;
the switch detection feedback module is used for detecting whether the display screen power supply module supplies power to the display screen or not, and when the power supply and the power supply exist for one time, the voltage is stored through the capacitive device, and the voltage stored by the capacitive device is consumed through a load; when the storage voltage of the capacitive device exceeds a set threshold value in the power supply and power off processes of the display screen, a control signal is fed back to drive the on-off control module to work;
the on-off control module is used for controlling the display screen power supply module to stop working when working and simultaneously driving the delay restarting module;
the delay restarting module is used for disconnecting the voltage loop of the display screen power supply module after the working delay, and then recovering the voltage loop of the display screen power supply module;
the output end of the voltage-stabilizing power supply module is connected with the first input end of the switch detection feedback module and the first input end of the delay restarting module, the output end of the display screen power supply module is connected with the second input end of the switch detection feedback module, the output end of the switch detection feedback module is connected with the input end of the on-off control module, the output end of the on-off control module is connected with the first input end of the display screen power supply module and the second input end of the delay restarting module, and the output end of the delay restarting module is connected with the second input end of the display screen power supply module.
2. The display screen safety protection circuit according to claim 1, wherein the voltage-stabilizing power supply module comprises a first resistor, a first capacitor, a voltage stabilizer and a second capacitor, one end of the first resistor is connected with the first voltage, the other end of the first resistor is connected with the input end of the voltage stabilizer and one end of the first capacitor, the other end of the first capacitor is grounded, the grounding of the voltage stabilizer is grounded, the output end of the voltage stabilizer is connected with one end of the second capacitor, the first input end of the switch detection feedback module and the first input end of the delay restarting module, and the other end of the second capacitor is grounded.
3. The display screen safety protection circuit according to claim 1, wherein the display screen power supply module comprises a first switch, a first MOS tube and a second switch, one end of the first switch is connected with a first voltage, the other end of the first switch is connected with an S pole of the first MOS tube, a G pole of the first MOS tube is connected with an output end of the on-off control module, a D pole of the first MOS tube is connected with one end of the second switch, the other end of the second switch is connected with one end of the display screen, a second input end of the switch detection feedback module, and the other end of the display screen is grounded.
4. The display screen safety protection circuit of claim 1, wherein the switch detection feedback module comprises:
the switch detection unit is used for detecting whether the display screen power supply module supplies power and cuts off power for the display screen, and charging the feedback unit once every time the power is supplied and cut off;
the feedback unit is used for driving the on-off control module to work when the storage voltage of the capacitive device in the feedback unit exceeds a set threshold value, and the on-off control module can discharge after charging and only charge for a plurality of times in a short time, and the storage voltage of the capacitive device in the feedback unit exceeds the set threshold value;
the first input end of the switch detection unit is connected with the output end of the voltage-stabilizing power supply module, the second input end of the switch detection unit is connected with the output end of the display screen power supply module, the output end of the switch detection unit is connected with the input end of the feedback unit, and the output end of the feedback unit is connected with the input end of the on-off control module.
5. The safety protection circuit of a display screen according to claim 4, wherein the switch detection unit comprises a fifth resistor, a third MOS tube, a fourth MOS tube, a second silicon controlled rectifier, a fourth resistor, a third diode and a fifth capacitor, an S pole of the fourth MOS tube is connected with an output end of the voltage-stabilizing power supply module, one end of the fifth resistor is connected with an output end of the display screen power supply module, the other end of the fifth resistor is connected with a G pole of the third MOS tube and a control pole of the second silicon controlled rectifier, an S pole of the third MOS tube is connected with a negative pole of the second silicon controlled rectifier, a positive pole of the second silicon controlled rectifier is connected with a D pole of the fourth MOS tube, a D pole of the third MOS tube is connected with one end of the fourth resistor, one end of the fifth capacitor and a negative pole of the third diode, the other end of the fourth resistor is grounded, the other end of the fifth capacitor is grounded, and a positive pole of the third diode is connected with an input end of the feedback unit and the G pole of the fourth MOS tube.
6. The circuit according to claim 4 or 5, wherein the feedback unit comprises a second diode, a third resistor, and a fourth capacitor, the anode of the second diode is connected to the output end of the switch detection unit, the cathode of the second diode is connected to one end of the third resistor, one end of the fourth capacitor, the input end of the on-off control module, the other end of the third resistor is grounded, and the other end of the fourth capacitor is grounded.
7. The display screen safety protection circuit according to claim 3, wherein the on-off control module comprises a sixth resistor and a first silicon controlled rectifier, one end of the sixth resistor is connected with an S pole of the first MOS tube, the other end of the sixth resistor is connected with a positive pole of the first silicon controlled rectifier, a negative pole of the first silicon controlled rectifier is connected with a second input end of the delay restarting module and a first input end of the display screen power supply module, and a control pole of the first silicon controlled rectifier is connected with an output end of the switch detection feedback module.
8. The safety protection circuit of a display screen according to claim 3 or 7, wherein the delay restarting module comprises a second resistor, a first potentiometer, a third capacitor, a second MOS tube, a first relay and a first diode, one end of the first relay is connected with the negative electrode of the first diode and the output end of the voltage-stabilizing power supply module, the other end of the first relay is connected with the positive electrode of the first diode and the D electrode of the second MOS tube, the S electrode of the second MOS tube is grounded, the G electrode of the second MOS tube is connected with one end of the third capacitor and one end of the first potentiometer, the other end of the third capacitor is grounded, the other end of the first potentiometer is connected with one end of the second resistor, and the other end of the second resistor is connected with the output end of the on-off control module.
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| CN117134292B (en) | 2024-01-23 |
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