CN112466240A - Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system - Google Patents
Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system Download PDFInfo
- Publication number
- CN112466240A CN112466240A CN202011467019.9A CN202011467019A CN112466240A CN 112466240 A CN112466240 A CN 112466240A CN 202011467019 A CN202011467019 A CN 202011467019A CN 112466240 A CN112466240 A CN 112466240A
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- operational amplifier
- display screen
- mcu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 title claims description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 230000002159 abnormal effect Effects 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 47
- 230000005856 abnormality Effects 0.000 claims description 8
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 claims description 6
- 101150102866 adc1 gene Proteins 0.000 claims description 6
- 101150042711 adc2 gene Proteins 0.000 claims description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Classifications
-
- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
According to the circuit, the method and the system for detecting voltage abnormity and automatically resetting the vehicle-mounted display screen, the MCU, the operational amplifier power supply module, the AD conversion module 1 and the AD conversion module 2 are arranged, the feedback loop is arranged on the TFT display screen operational amplifier power supply module and the multistage voltage doubling circuit, the MCU is accessed, the MCU is used for detecting whether the driving voltage of the TFT display screen is abnormal or not and whether the Gate voltage is abnormal or not, the MCU is connected with an EN pin of the operational amplifier power supply module, and therefore when the driving voltage of the TFT display screen and the Gate voltage are abnormal, the MCU resets the operational amplifier power supply module to eliminate faults such as abnormal contrast of a screen and the display screen. The TFT screen Gate voltage fault condition can be recorded to a meter DTC, and the root cause can be quickly located by analyzing the screen fault.
Description
Technical Field
The invention relates to the field of vehicle-mounted display screens, in particular to a circuit, a method and a system for detecting voltage abnormity and automatically resetting the vehicle-mounted display screen.
Background
TFT (thin Film transistor) is that liquid crystal display comprises liquid crystal display and two parts of board in a poor light, VSP, VSN are liquid crystal drive power, produce by liquid crystal display fortune power module, can charge for the printing opacity's of control pixel electric capacity, VSP is the positive voltage, VSN is the negative voltage, VGH, VGL are the Gate voltage, for the opening and closing voltage of switch tube on the pixel, VGH is the high level burden and opens and charge for the pixel electric capacity, VGL is responsible for closing the switch tube for the negative voltage.
Most of design schemes of a Gate voltage of a vehicle-mounted liquid crystal instrument driving TFT screen adopt a voltage doubling circuit scheme, a VGH voltage of the screen is generated by a VSP voltage of a screen operational amplifier power supply module through a multistage voltage doubling circuit formed by a diode and a capacitor, and the VGH voltage of a common screen needs about 6 levels; the VGL voltage of the screen also adopts a multistage voltage doubling circuit formed by a VSN voltage through a diode and a capacitor to reach the voltage required by the TFT screen. In the prior art, the output of the power supply module of the screen operational amplifier has no feedback loop, and when the output voltage of the voltage doubling circuit is abnormal, the power supply module of the screen operational amplifier cannot acquire the abnormal condition of the output voltage; the Gate voltage of the screen can not be recovered to be normal, so that the TFT can always display a screen-splash; when the voltages of the VSP and the VSN are abnormal, the power supply module of the screen operational amplifier can not acquire the abnormality; in addition, if only one way voltage of the VGL is abnormal, the display does not generate a screen splash, the display looks darker, the basic reason is that contrast is abnormal due to the abnormal VGL, but the fault is judged from the darker display, and the fault is easily mistaken to be caused by backlight damage.
Disclosure of Invention
The invention provides a circuit, a method and a system for detecting voltage abnormity and automatically resetting a vehicle-mounted display screen, and solves the technical problems that a screen operational amplifier power supply module for driving a TFT display screen outputs a feedback-free loop, and when the output voltage of a voltage doubling circuit is abnormal, the screen operational amplifier power supply module cannot acquire the abnormal condition of the output voltage. In order to solve the technical problems, the invention provides a voltage abnormity detection and automatic reset circuit of a vehicle-mounted display screen, which comprises an operational amplifier power supply module, a multistage voltage doubling circuit 1, a multistage voltage doubling circuit 2 and a TFT display screen; the first output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 1, the second output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 2, and the multistage voltage doubling circuit 1 and the multistage voltage doubling circuit 2 are connected with the TFT display screen; further comprising: the device comprises an MCU, an AD conversion module 1 and an AD conversion module 2;
the AD conversion module 1 is respectively connected with a port ADC1 of the MCU and the multistage voltage doubling circuit 1, converts the VGH voltage value of the multistage voltage doubling circuit 1 into a digital signal and sends the digital signal to the MCU;
the AD conversion module 2 is respectively connected with the port ADC2 of the MCU and the multistage voltage doubling circuit 2, converts the VGL voltage value of the multistage voltage doubling circuit 2 into a digital signal and sends the digital signal to the MCU;
the MCU is also connected with the operational amplifier power supply module through the GPIO port and used for resetting the operational amplifier power supply module when the voltage of the multistage voltage doubling circuit 1 or the multistage voltage doubling circuit 2 is abnormal.
This basic scheme is through setting up MCU, the power module is put to fortune, AD conversion module 1, AD conversion module 2, set up feedback loop on power module and multistage voltage doubling way are put to TFT display screen fortune, access MCU again, utilize MCU to detect whether unusual and the Gate voltage of TFT display screen drive voltage is unusual, connect the EN pin of fortune power module with MCU, make when unusual appearing in TFT display screen drive voltage and Gate voltage, it puts power module and eliminates trouble such as colored screen and display screen contrast degree are unusual to reset fortune. The TFT screen Gate voltage fault condition can be recorded to a meter DTC, and the root cause can be quickly located by analyzing the screen fault.
Further, the AD conversion module 1 includes a diode D1, a resistor R1, and a resistor R2, the anode of the diode D1 is connected to the multistage voltage doubling circuit 1, the cathode of the diode D1 is connected to the resistor R1, the other end of the resistor R1 is connected to the ADC1 port of the MCU and the resistor R2, and the other end of the resistor R2 is grounded.
According to the scheme, the multistage voltage doubling circuit 1 is connected into the AD conversion module, and then the AD conversion module is connected into the MCU to form a first feedback loop, namely, the VGH voltage is connected into the first feedback loop, so that the VGH voltage can be detected by the MCU when the VGH voltage breaks down.
Further, the AD conversion module 2 is also connected to an operational amplifier power supply module; the AD conversion module 2 comprises a double-path operational amplifier U2, a diode D2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1 and an inductor L2;
the cathode of the diode D2 is connected with the multistage voltage doubling circuit 2, and the anode is connected with the resistor R3; the other end of the resistor R3 is connected with a resistor R5, the other end of the resistor R3 is also connected with a resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor R3 is also connected with a capacitor C1, the capacitor C1 is grounded, the other end of the resistor R5 is respectively connected with a resistor R6 and a first inverting input end of a dual-path operational amplifier U2, the other end of the resistor R6 is respectively connected with a resistor R7 and a first output end of a dual-path operational amplifier U2, and the resistor R7 is connected with an ADC2 port of the MCU;
the inductor L1 is connected with a second output end of the operational amplifier power supply module, the other end of the inductor L1 is connected with a ground end of the dual-path operational amplifier U2, the other end of the inductor L1 is further connected with a capacitor C2 and a capacitor C3, and the capacitor C2 and the capacitor C3 are grounded;
the first output end of the operational amplifier power supply module is connected with an inductor L2, the other end of the inductor L2 is respectively connected with a power supply end of a double-path operational amplifier U2, a capacitor C4 and a capacitor C5, and the other ends of the capacitor C4 and the capacitor C5 are grounded.
According to the scheme, the multistage voltage doubling circuit 2, the first output end of the operational amplifier power supply module and the second output end of the operational amplifier power supply module are connected into the AD conversion module 2 to form a second feedback loop, namely VSP, VSN and VGL voltages are connected into the second feedback loop, so that voltages of VSP, VSN and VGL three paths can be detected by the MCU when the voltages are abnormal.
Furthermore, the AD conversion module 2 further includes a resistor R8, the resistor R8 is connected to the first non-inverting input terminal of the dual-path op amp U2, and the other end of the resistor R8 is grounded.
Furthermore, the AD conversion module 2 further includes a resistor R9 and a resistor R10, a second inverting input end of the dual-path operational amplifier U2 is connected to a second output end of the dual-path operational amplifier U2, a first output end of the operational amplifier power supply module is connected to the resistor R10, the other end of the resistor R10 is connected to a second non-inverting input end of the resistor R9 and the dual-path operational amplifier U2, and the other end of the resistor R9 is grounded.
According to the scheme, the other path of the double-path operational amplifier U2 is designed to be a voltage follower, so that the anti-interference performance of the circuit is improved, and the stability of the circuit is improved.
Further, the AD conversion module 1 adjusts the voltage value of VGH to be 2.64-3.3V and outputs the VGH to the MCU; the AD conversion module 2 adjusts the voltage value of the VGL to be 2.64-3.3V and outputs the VGL to the MCU.
This scheme sets up the voltage setting of two way feedback circuit between 2.64 ~ 3.3V, makes things convenient for MCU to detect, avoids MCU and double-circuit fortune to put the ware and is burnt out.
Further, the dual lane handler U2 may be replaced with a single lane handler.
The invention also provides a voltage abnormity detection and automatic reset method for the vehicle-mounted display screen, which comprises the following steps:
s1, detecting the voltage abnormity of the TFT display screen by the MCU;
s2, the MCU performs reset operation on the operational amplifier power supply module;
and S3, restarting the TFT display screen.
This basic scheme utilizes MCU to detect TFT display screen voltage whether unusual, and when TFT display screen voltage was unusual, MCU put power module to fortune and reset the operation for faults such as screen splash, contrast are unusual can be eliminated to the TFT display screen, and restart resumes normally.
The invention also provides a system for detecting and automatically resetting the voltage abnormity of the vehicle-mounted display screen, which comprises the circuit and the method for detecting and automatically resetting the voltage abnormity of the vehicle-mounted display screen.
Drawings
Fig. 1 is a schematic structural diagram of a voltage anomaly detection and automatic reset circuit of a vehicle-mounted display screen according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an AD conversion module 1 according to an embodiment of the present invention;
fig. 3 is a circuit diagram of the AD conversion module 2 according to the embodiment of the present invention;
fig. 4 is a flowchart of a method for detecting voltage abnormality and automatically resetting a vehicle-mounted display screen according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
As shown in fig. 1, a schematic diagram of a voltage anomaly detection circuit for a vehicle-mounted display screen according to an embodiment of the present invention includes an operational amplifier power supply module, a multistage voltage doubling circuit 1, a multistage voltage doubling circuit 2, and a TFT display screen; the first output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 1, the second output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 2, and the multistage voltage doubling circuit 1 and the multistage voltage doubling circuit 2 are connected with the TFT display screen; further comprising: the device comprises an MCU, an AD conversion module 1 and an AD conversion module 2;
the MCU is an integrated control unit of the GPU and the CPU and is used for resetting the operational amplifier power supply module when the voltage of the multistage voltage doubling circuit 1 or the multistage voltage doubling circuit 2 is abnormal;
the operational amplifier power supply module is used for supplying power to the TFT display screen, a positive and negative dual-output DC-DC converter is arranged in the operational amplifier power supply module, the model TPS65131 of a Texas instrument is used in the embodiment, MAX20069 can also be selected, and the integration degree of the chip is higher, but not limited to the chips of the two models. The first output end of the operational amplifier power supply module outputs VSP positive voltage to the multistage voltage doubling circuit 1, and the second output end outputs VSN negative voltage to the multistage voltage doubling circuit 2. Multistage voltage doubling circuit 1 or multistage voltage doubling circuit 2 are schottky diode and paster ceramic capacitor combination, and multistage voltage doubling circuit 1 output VGH voltage to the TFT display screen, and multistage voltage doubling circuit 2 output VGL voltage to the TFT display screen.
The AD conversion module 1 is respectively connected with the port ADC1 of the MCU and the multistage voltage doubling circuit 1, the AD conversion module 1 is composed of a conversion circuit formed by a diode isolation and a resistor, and the VGH voltage value of the multistage voltage doubling circuit 1 is converted into a digital signal to be sent to the MCU.
The AD conversion module 2 is respectively connected with the port ADC2 of the MCU and the multistage voltage doubling circuit 2, the AD conversion module 2 is formed by a negative proportion operation circuit formed by dual power supplies of an operational amplifier power supply module, and the VGL voltage value of the multistage voltage doubling circuit 2 is converted into a digital signal to be sent to the MCU.
As shown in fig. 2, the AD conversion module 1 includes a diode D1, a resistor R1, and a resistor R2, the anode of the diode D1 is connected to the multistage voltage doubling circuit 1, the cathode of the diode D1 is connected to the resistor R1, the other end of the resistor R1 is connected to the ADC1 port of the MCU and the resistor R2, and the other end of the resistor R2 is grounded.
The diode D1 is used for isolation in the design of fig. 2, so as to avoid the impedance of the circuit in the later stage from affecting the load size of VGH. In the design, the voltage is adjusted within the range of 2.64-3.3V by using the voltage division relation of R1 and R2, and the level is ensured to be within the high-level detection range of the MCU. When the ADC port of the MCU detects voltage abnormity, the MCU carries out EN pin reset operation on the operational amplifier power supply module through the GPIO port.
As shown in fig. 3, the AD conversion module 2 is further connected to an operational amplifier power supply module; the AD conversion module 2 comprises a double-path operational amplifier U2, a diode D2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1 and an inductor L2;
the cathode of the diode D2 is connected with the multistage voltage doubling circuit 2, and the anode is connected with the resistor R3; the other end of the resistor R3 is connected with a resistor R5, the other end of the resistor R3 is also connected with a resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor R3 is also connected with a capacitor C1, the capacitor C1 is grounded, the other end of the resistor R5 is respectively connected with a resistor R6 and a first inverting input end (pin 2) of the dual-path operational amplifier U2, the other end of the resistor R6 is respectively connected with a resistor R7 and a first output end (pin 1) of the dual-path operational amplifier U2, and the resistor R7 is connected with an ADC2 port of the MCU;
the inductor L1 is connected with a second output end of the operational amplifier power supply module, the other end of the inductor L1 is connected with a ground end (pin 4) of the dual-path operational amplifier U2, the other end of the inductor L1 is further connected with a capacitor C2 and a capacitor C3, and the capacitor C2 and the capacitor C3 are grounded;
the first output end of the operational amplifier power supply module is connected with an inductor L2, the other end of the inductor L2 is respectively connected with a power supply end (pin 8) of a double-path operational amplifier U2, a capacitor C4 and a capacitor C5, and the other ends of the capacitor C4 and the capacitor C5 are grounded.
Furthermore, the AD conversion module 2 further includes a resistor R8, the resistor R8 is connected to the first non-inverting input terminal of the dual-path op amp U2, and the other end of the resistor R8 is grounded.
Furthermore, the AD conversion module 2 further includes a resistor R9 and a resistor R10, a second inverting input end of the dual-path operational amplifier U2 is connected to a second output end of the dual-path operational amplifier U2, a first output end of the operational amplifier power supply module is connected to the resistor R10, the other end of the resistor R10 is connected to a second non-inverting input end of the resistor R9 and the dual-path operational amplifier U2, and the other end of the resistor R9 is grounded.
The VGL voltage of the TFT display screen of fig. 3 is negative voltage and the amplitude is generally about-12V, and if the VGL voltage is directly input to the MCU, the chip cannot be identified and is damaged. The design must change VGL to positive pressure first, and the MCU can detect. The operational amplifier power supply module supplies power to the double-path operational amplifier U2 in a bidirectional mode, a VDD power supply end of the double-path operational amplifier U2 is connected with VSP voltage, and a GND ground end of the U2 is connected with VSN voltage. In the design, the negative proportion amplifier design of the operational amplifier is utilized, the VGL voltage is changed from-12V to positive voltage, and the output size is adjusted by the device parameters of a resistor R3, a resistor R4, a resistor R5 and a resistor R6. The diode D2 plays the role of isolation, and the VGL voltage is negative so the cathode of the diode needs to be connected with VGL. The VGL voltage is divided after passing through a diode D29, the divided voltage is determined by the proportional relation between R3 and R4, the divided voltage cannot exceed the power supply voltage of the MCU and the U2, otherwise, the MCU and the U2 chip of the double-path operational amplifier are damaged, the input voltage signal can be adjusted to be about 3.3V through the proportional relation between R3 and R4, and the voltage value can be lower than 3.3V. In the embodiment, the voltage is adjusted to be within the range of 2.64-3.3V, so that the input is ensured to be in the MCU high level range. The first non-inverting input of the dual-way operational amplifier U2 needs to be connected with a resistor R8 for balancing.
The other path of the dual path op amp U2, which does not actually use a circuit, needs to be designed in voltage follower mode. The design is as follows:
a pin 5 (a second non-inverting input end) of the dual-path amplifier U2 is connected with the VSP, and a pin 6 (a second inverting input end) and a pin 7 (a second output end) are connected to form a positive voltage follower circuit. Designed to provide tamper resistance.
VSP and VSN output by the operational amplifier power supply module are used as operational amplifier power supply in the circuit design, VGL negative pressure is changed into positive pressure and then used as detection, and 3 paths of voltage can be monitored by using an ADC port of the MCU. When VGL, VSP and VSN of U1 are abnormal and have no output, the MCU can utilize EN pin to reset and restart the IC.
The scheme U2 operational amplifier can also adopt a single-path operational amplifier.
As shown in fig. 4, the present invention further provides a voltage anomaly detection and automatic reset method for a vehicle-mounted display screen, which comprises the following steps:
s1, detecting the voltage abnormity of the TFT display screen by the MCU;
s2, the MCU performs reset operation on the operational amplifier power supply module;
and S3, restarting the TFT display screen.
According to the circuit, the method and the system for detecting voltage abnormity and automatically resetting the vehicle-mounted display screen, the MCU, the operational amplifier power supply module, the AD conversion module 1 and the AD conversion module 2 are arranged, the feedback loop is arranged on the TFT display screen operational amplifier power supply module and the multistage voltage doubling circuit, the MCU is accessed, the MCU is used for detecting whether the driving voltage of the TFT display screen is abnormal or not and whether the Gate voltage is abnormal or not, the MCU is connected with an EN pin of the operational amplifier power supply module, and therefore when the driving voltage of the TFT display screen and the Gate voltage are abnormal, the operational amplifier power supply module is reset to eliminate faults such as abnormal contrast of a screen and the display screen. The TFT screen Gate voltage fault condition can be recorded to a meter DTC, and the root cause can be quickly located by analyzing the screen fault.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. A vehicle-mounted display screen voltage abnormity detection and automatic reset circuit comprises an operational amplifier power supply module, a multistage voltage doubling circuit 1, a multistage voltage doubling circuit 2 and a TFT display screen; the first output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 1, the second output end of the operational amplifier power supply module is connected with the multistage voltage doubling circuit 2, and the multistage voltage doubling circuit 1 and the multistage voltage doubling circuit 2 are connected with the TFT display screen; it is characterized by also comprising: the device comprises an MCU, an AD conversion module 1 and an AD conversion module 2;
the AD conversion module 1 is respectively connected with a port ADC1 of the MCU and the multistage voltage doubling circuit 1, converts the VGH voltage value of the multistage voltage doubling circuit 1 into a digital signal and sends the digital signal to the MCU;
the AD conversion module 2 is respectively connected with the port ADC2 of the MCU and the multistage voltage doubling circuit 2, converts the VGL voltage value of the multistage voltage doubling circuit 2 into a digital signal and sends the digital signal to the MCU;
the MCU is also connected with the operational amplifier power supply module through the GPIO port and used for resetting the operational amplifier power supply module when the voltage of the multistage voltage doubling circuit 1 or the multistage voltage doubling circuit 2 is abnormal.
2. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 1, characterized in that: the AD conversion module 1 comprises a diode D1, a resistor R1 and a resistor R2, the anode of the diode D1 is connected with the multistage voltage doubling circuit 1, the cathode of the diode D1 is connected with the resistor R1, the other end of the resistor R1 is connected with the ADC1 port and the resistor R2 of the MCU respectively, and the other end of the resistor R2 is grounded.
3. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 1, characterized in that: the AD conversion module 2 is also connected with an operational amplifier power supply module; the AD conversion module 2 comprises a double-path operational amplifier U2, a diode D2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1 and an inductor L2;
the cathode of the diode D2 is connected with the multistage voltage doubling circuit 2, and the anode is connected with the resistor R3; the other end of the resistor R3 is connected with a resistor R5, the other end of the resistor R3 is also connected with a resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor R3 is also connected with a capacitor C1, the capacitor C1 is grounded, the other end of the resistor R5 is respectively connected with a resistor R6 and a first inverting input end of a dual-path operational amplifier U2, the other end of the resistor R6 is respectively connected with a resistor R7 and a first output end of a dual-path operational amplifier U2, and the resistor R7 is connected with an ADC2 port of the MCU;
the inductor L1 is connected with a second output end of the operational amplifier power supply module, the other end of the inductor L1 is connected with a ground end of the dual-path operational amplifier U2, the other end of the inductor L1 is further connected with a capacitor C2 and a capacitor C3, and the capacitor C2 and the capacitor C3 are grounded;
the first output end of the operational amplifier power supply module is connected with an inductor L2, the other end of the inductor L2 is respectively connected with a power supply end of a double-path operational amplifier U2, a capacitor C4 and a capacitor C5, and the other ends of the capacitor C4 and the capacitor C5 are grounded.
4. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 3, characterized in that: the AD conversion module 2 further includes a resistor R8, the resistor R8 is connected to the first non-inverting input terminal of the dual-path operational amplifier U2, and the other end of the resistor R8 is grounded.
5. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 3, characterized in that: AD conversion module 2 still includes resistance R9, resistance R10, double-circuit fortune is put ware U2 second opposite phase input and is connected double-circuit fortune and put ware U2 second output, fortune is put the first output connecting resistance R10 of power module, the resistance R10 other end is connecting resistance R9 and double-circuit fortune and is put ware U2 second homophase input end respectively, resistance R9 other end ground connection.
6. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 1, characterized in that: the AD conversion module 1 also adjusts the voltage value of VGH to be 2.64-3.3V and outputs the VGH to the MCU; the AD conversion module 2 adjusts the voltage value of the VGL to be 2.64-3.3V and outputs the VGL to the MCU.
7. The voltage abnormality detection and automatic reset circuit for the vehicle-mounted display screen according to claim 3, characterized in that: the two-way load cell U2 may also be replaced with a single-way load cell.
8. A voltage abnormity detection and automatic reset method for a vehicle-mounted display screen is characterized by comprising the following steps:
s1, detecting the voltage abnormity of the TFT display screen by the MCU;
s2, the MCU performs reset operation on the operational amplifier power supply module;
and S3, restarting the TFT display screen.
9. The utility model provides a vehicle-mounted display screen voltage anomaly detection and automatic re-setting system which characterized in that: the vehicle-mounted display screen voltage abnormity detection and automatic reset circuit and method as claimed in claims 1 to 8 are included.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011467019.9A CN112466240A (en) | 2020-12-14 | 2020-12-14 | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011467019.9A CN112466240A (en) | 2020-12-14 | 2020-12-14 | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112466240A true CN112466240A (en) | 2021-03-09 |
Family
ID=74803158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011467019.9A Pending CN112466240A (en) | 2020-12-14 | 2020-12-14 | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112466240A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180614A (en) * | 2017-06-26 | 2017-09-19 | 奇瑞汽车股份有限公司 | Vehicle-carrying display screen automatic recovery system, control method and back of the body optical detection circuit |
| CN110264973A (en) * | 2019-06-27 | 2019-09-20 | 广州小鹏汽车科技有限公司 | The driving method of bias self-repairing circuit and bias self-repairing circuit |
| CN111223462A (en) * | 2020-02-21 | 2020-06-02 | 湖北亿咖通科技有限公司 | Liquid crystal display screen drive circuit |
| CN211788105U (en) * | 2020-03-31 | 2020-10-27 | 惠州市德赛西威汽车电子股份有限公司 | Multi-path positive and negative voltage output circuit adopting one switching power supply chip |
-
2020
- 2020-12-14 CN CN202011467019.9A patent/CN112466240A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180614A (en) * | 2017-06-26 | 2017-09-19 | 奇瑞汽车股份有限公司 | Vehicle-carrying display screen automatic recovery system, control method and back of the body optical detection circuit |
| CN110264973A (en) * | 2019-06-27 | 2019-09-20 | 广州小鹏汽车科技有限公司 | The driving method of bias self-repairing circuit and bias self-repairing circuit |
| CN111223462A (en) * | 2020-02-21 | 2020-06-02 | 湖北亿咖通科技有限公司 | Liquid crystal display screen drive circuit |
| CN211788105U (en) * | 2020-03-31 | 2020-10-27 | 惠州市德赛西威汽车电子股份有限公司 | Multi-path positive and negative voltage output circuit adopting one switching power supply chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101680803B (en) | Optical sensor and display device provided with the same | |
| KR20090065940A (en) | Light sensor inspection unit, method of inspecting the same and display device | |
| CN103176053A (en) | Measuring circuit for capacity and parasitic resistance of capacitor | |
| CN104635102A (en) | Electronic component detection device and detection method thereof | |
| CN108182922A (en) | Common voltage regulating device, adjusting method and liquid crystal display device | |
| CN201345019Y (en) | Liquid crystal display module recording device | |
| CN108922489A (en) | A kind of bearing calibration of driving circuit and its internal overcurrent setting value | |
| CN100437133C (en) | Low voltage replacement function detecting circuit | |
| CN102053229A (en) | Power detection device | |
| CN204903740U (en) | Power detecting circuit | |
| CN112466240A (en) | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system | |
| CN210380849U (en) | 25G optical module testing arrangement | |
| CN107481678A (en) | Backlight drive current monitoring circuit, method and the display device of backlight module | |
| CN109144160A (en) | A kind of bearing calibration and device | |
| CN101944302A (en) | Teaching experimental platform for photoelectric sensor | |
| CN208622409U (en) | A kind of high-definition liquid crystal screen logic card | |
| CN113567736B (en) | Voltage measurement circuit, fault indicator and voltage calibration method | |
| GB2617511A (en) | Pulse signal output circuit and flowmeter | |
| CN209401290U (en) | Backlight circuit | |
| CN209342268U (en) | A kind of resistance-type bridge joint pressure sensing adjuster | |
| US8330093B2 (en) | Apparatus and method for preventing charge pumping in series connected diode stacks | |
| CN218917549U (en) | High tension switchgear discharge detection system | |
| CN202929743U (en) | Watermeter circuit module with battery capable of being changed | |
| CN219224997U (en) | Sub-card in-position detection circuit, electronic equipment and sub-card in-position detection system | |
| CN213581118U (en) | Extension detection circuit of alternating voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |