CN114464145B - Drive control circuit, mobile terminal and method - Google Patents
Drive control circuit, mobile terminal and method Download PDFInfo
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- CN114464145B CN114464145B CN202210179881.2A CN202210179881A CN114464145B CN 114464145 B CN114464145 B CN 114464145B CN 202210179881 A CN202210179881 A CN 202210179881A CN 114464145 B CN114464145 B CN 114464145B
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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
- G09G3/3406—Control of illumination source
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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
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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
Abstract
The invention provides a drive control circuit, a mobile terminal and a method, wherein the drive control circuit comprises: the low-voltage comparison circuit compares the input voltage with a first voltage threshold value and outputs a first logic signal; the first logic gate controls the first switch component to be opened or closed according to the first logic signal and the first control signal; after the received first logic signal is turned over, the CPU controls a second control signal to be a closing signal, and after a first preset time length, the CPU controls the second control signal to be an opening signal; and determining that the switching times of the first switching component in the second preset time length are not less than the quantity threshold value, and controlling the first switching component to be switched off. The CPU controls the first switch assembly to be closed and opened after the first logic signal is turned over, namely, after the rear end of the CPU has high current, and controls the first switch assembly to be closed after the switching times of the first switch assembly within a second preset time period are not less than a quantity threshold value, so that the backlight driving chip stops working, and the explosion resistance of the mobile terminal is improved.
Description
Technical Field
The invention belongs to the technical field of circuits, and particularly relates to a drive control circuit, a mobile terminal and a method.
Background
At present, the technology of the mobile terminal is rapidly developed, for example, a smart phone, a tablet personal computer and the like, when the mobile terminal is applied to industries such as coal, petrochemical and the like, the explosion-proof requirement on the mobile terminal is high because the environment is an explosive environment.
Therefore, how to improve the explosion-proof performance of the mobile terminal is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a drive control circuit, a mobile terminal and a method, which are used for solving the problem of poor explosion resistance of the mobile terminal in the prior art.
In a first aspect, an embodiment of the present invention provides a driving control circuit, which is applied to a mobile terminal, and includes: the circuit comprises a processor CPU, a low-voltage comparison circuit, a first switch component and a first logic gate;
the low-voltage comparison circuit is used for comparing the input voltage of the backlight driving chip with a first voltage threshold value and outputting a first logic signal according to a first comparison result;
the first logic gate is used for controlling the first switch component to be opened or closed according to the first logic signal and a first control signal output by the CPU;
the first switch component is used for conducting a path between the input voltage and the backlight driving chip when the first switch component is started, and disconnecting the path between the input voltage and the backlight driving chip when the first switch component is closed;
the CPU is used for controlling the first control signal to be a closing signal after the received first logic signal is turned over, and controlling the first control signal to be an opening signal after a first preset time length; and determining that the switching times of the first switch assembly in a second preset time period are greater than or equal to a quantity threshold, and controlling the first control signal to be a closing signal so as to control the first switch assembly to be closed.
In a possible implementation manner, after the received first logic signal is inverted, the CPU is further configured to:
detecting the connection state of a display screen of the mobile terminal and the backlight driving chip;
and if the connection state is not connection, controlling a second control signal output to an enabling end of the backlight driving chip to be a closing signal, and controlling the second control signal to be an opening signal after the first preset time length.
In a possible implementation manner, after determining that the number of times of switching on and off the first switch component within a second preset time period is greater than or equal to a number threshold and controlling the first control signal to be an off signal, the CPU is further configured to:
and controlling the second control signal to be a closing signal so as to close the backlight driving chip.
In a possible implementation manner, the high-voltage comparator circuit, the second switch assembly and the second logic gate are further included;
the high-voltage comparison circuit is used for comparing the output voltage of the backlight driving chip with a second voltage threshold value and outputting a second logic signal according to a second comparison result;
the second logic gate is used for controlling the second switch component to be opened or closed according to the second logic signal and a third control signal output by the CPU;
the second switch component is used for conducting a path between the first switch component and the backlight driving chip when the second switch component is started, and disconnecting the path between the first switch component and the backlight driving chip when the second switch component is closed;
the CPU is further configured to control the third control signal to be a turn-off signal after the received second logic signal is inverted, so as to control the second switch component to be turned off.
In a possible implementation manner, after the received second logic signal is inverted, and before the third control signal is controlled to be a shutdown signal, the CPU is further configured to:
detecting the connection state of the display screen and the backlight driving chip;
if the connection state is not connected, controlling the second control signal and the third control signal to be both off signals, and controlling the second control signal and the third control signal to be both on signals after a third preset time period; determining that the received second logic signal is inverted again.
In a possible implementation manner, after controlling the third control signal to be an off signal, the CPU is further configured to:
and controlling the second control signal to be a closing signal so as to close the backlight driving chip.
In a second aspect, an embodiment of the present invention further provides a mobile terminal, which includes a display screen, a backlight driving chip, and the driving control circuit according to any one of the first aspects.
In a third aspect, an embodiment of the present invention further provides a driving control method, which is applied to the driving control circuit according to any one of the first aspect, where the method includes:
after the received first logic signal is turned over, controlling the first control signal to be a closing signal, and after a first preset time length, controlling the first control signal to be an opening signal;
and determining that the switching times of the first switch component in a second preset time length are greater than or equal to a quantity threshold value, and controlling the first control signal to be a closing signal so as to control the first switch component to be closed.
In one possible implementation, the method further includes:
and after receiving the second logic signal and turning over, controlling the third control signal to be a closing signal so as to close the second switch component.
In a possible implementation manner, after the third control signal is controlled to be an off signal, the second control signal is also controlled to be an off signal, so as to turn off the backlight driving chip.
The drive control circuit, the mobile terminal and the method provided by the embodiment of the invention are applied to the mobile terminal and comprise the following steps: the low-voltage comparison circuit is used for comparing the input voltage of the backlight driving chip with a first voltage threshold value and outputting a first logic signal according to a first comparison result; the first logic gate is used for controlling the first switch component to be opened or closed according to the first logic signal and a first control signal output by the CPU; the first switch component is used for conducting a path between the input voltage and the backlight driving chip when the first switch component is started and disconnecting the path between the input voltage and the backlight driving chip when the first switch component is closed; the CPU is used for controlling the first control signal to be a closing signal after the received first logic signal is turned over, and controlling the first control signal to be an opening signal after a first preset time length; and determining that the switching times of the first switching component in the second preset time length are greater than or equal to the quantity threshold, and controlling the first control signal to be a closing signal so as to control the first switching component to be closed. The CPU can control the first switch component to be closed and opened by controlling the signal state of the first control signal after the first logic signal is turned over, namely, the rear end has large current to cause the input voltage to be abnormal, and controls the first switch component to be closed after the number of times of the switching of the first switch component is determined to be more than or equal to the number threshold value within the second preset time period, so that the passage between the input voltage and the backlight driving chip is thoroughly disconnected, the backlight driving chip stops working, explosion caused by large current load can be reduced, and the explosion resistance of the mobile terminal is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1a is a schematic diagram of a driving control circuit according to an embodiment of the present invention;
FIG. 1b is a schematic diagram of another driving control circuit according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of the first switch module protection according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of another driving control circuit according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of protection of a second switch module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a driving control method according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.
In a mobile terminal applied to industries such as coal industry and petrochemical industry, for example, a smart phone, a tablet personal computer, etc., in this environment, if a display screen and a backlight driving chip are connected abnormally, for example, a connector connecting the display screen and the backlight driving chip is loosened or falls off, a large current is generated, and the large current easily causes explosion.
In order to improve the explosion-proof performance of the mobile terminal, an embodiment of the present invention provides a driving control circuit, which is applied to the mobile terminal, and as shown in fig. 1a, the driving control circuit includes: a processor CPU100, a low voltage comparison circuit 200, a first switching assembly 300 and a first logic gate 400;
the low-voltage comparison circuit 200 is configured to compare an input voltage of the backlight driver chip with a first voltage threshold, and output a first logic signal IO1 according to a first comparison result;
the first logic gate 400 is configured to control the first switch component 300 to be turned on or turned off according to the first logic signal IO1 and a first control signal GPIO1 output by the CPU 100;
a first switch assembly 300 for turning on a path between an input voltage and the backlight driving chip when turned on and turning off the path between the input voltage and the backlight driving chip when turned off;
the CPU100 is configured to control the first control signal GPIO1 to be a turn-off signal after receiving the first logic signal IO1 and turning over the first logic signal IO1, and control the first control signal GPIO1 to be a turn-on signal after a first preset time period; and determining that the switching times of the first switching component 300 in the second preset time period are greater than or equal to the quantity threshold, and controlling the first control signal GPIO1 to be a closing signal so as to control the first switching component 300 to close.
The driving control circuit provided by the embodiment of the invention is applied to a mobile terminal, an input voltage of a backlight driving chip is compared with a first voltage threshold value through a low-voltage comparison circuit 200, a first logic signal IO1 is output according to a first comparison result, the first logic signal IO1 and a first control signal GPIO1 output by a CPU100 control the opening or closing of a first switch component 300 through a first logic gate 400, the first switch component 300 conducts a path between the input voltage and the backlight driving chip when being opened, and breaks the path between the input voltage and the backlight driving chip when being closed, after the first logic signal is inverted, the CPU100 controls the first control signal GPIO1 as a closing signal, and controls the first control signal GPIO1 as an opening signal after a first preset time length, determines that the switching times of the first switch component 300 in a second preset time length are greater than or equal to a quantity threshold value, and controls the first control signal GPIO1 as a closing signal to control the first switch component 300 to be closed. After the first logic signal is inverted, that is, after the input voltage is abnormal due to the large current at the rear end, the CPU100 controls the first switch assembly 300 to be turned off and on by controlling the signal state of the first control signal GPIO1, and controls the first switch assembly 300 to be turned off after the number of times of switching the first switch assembly 300 is determined to be greater than or equal to the number threshold value within the second preset time period, so as to completely disconnect the path between the input voltage and the backlight driving chip, so that the backlight driving chip stops working, thereby reducing the explosion caused by the large current load, and further improving the explosion resistance of the mobile terminal.
In an implementation, the low voltage comparing circuit 200 may be a comparator, a first input terminal of the comparator is connected to the input voltage terminal for inputting a voltage, and a second input terminal of the comparator is connected to the first reference voltage terminal for inputting the first voltage threshold. When no large current appears at the rear end, the input voltage is greater than or equal to the first voltage threshold, at this time, the first logic signal IO1 output by the comparator may be 0, when the large current appears at the rear end, the input voltage gradually decreases, when the input voltage is less than the first voltage threshold, the first logic signal IO1 output by the comparator may be 1, and the first logic signal is changed from 0 to 1, that is, the first logic signal IO1 is turned over.
It should be noted that, in the embodiment of the present invention, 0 represents a low level, and 1 represents a high level.
The first switch element 300 may be turned on at a low level or at a high level, and different first logic gates 400 may be selected according to whether the first switch element 300 is turned on at a low level or at a high level, for example, the first switch element 300 is a PMOS transistor, and when the low level is turned on, the first logic gate 400 may be an or gate, when the input voltage is normal, the output of the first logic signal IO1 is 0, and the output of the first control signal GPIO1 output by the cpu100 is also 0, the output of the or gate is 0, and at this time, the first switch element 300 is turned on, i.e., normally turned on; when the input voltage is smaller than the first voltage threshold, the first logic signal IO1 outputs 1, the first logic gate 400 outputs 1, and the first switch component 300 is turned off.
It should be noted that, when at least one of the first logic signal IO1 or the first control signal GPIO1 is 1, the first logic gate 400 (or gate) outputs 1.
In addition, when the low voltage comparison circuit 200 transmits the first logic signal IO1 to the first logic gate 400 and simultaneously transmits the first logic signal IO1 to the CPU100, when the first logic signal IO1 is inverted, the first logic signal IO1 may be used as an interrupt signal of the CPU100, i.e., the first interrupt signal INT1 in fig. 1 a. After receiving the first interrupt signal INT1, the CPU100 may control the first control signal GPIO1 as a turn-off signal.
In the embodiment of the present invention, after the CPU100 determines that the received first logic signal IO1 is inverted, it may not immediately determine that a large current occurs at the rear end, but needs to further determine to control the first control signal GPIO1 to be a turn-off signal, that is, a high level 1, because the first logic signal IO1 is inverted, that is, changed from 0 to 1, the first logic gate 400 outputs 1, the first switch component 300 is turned off, and at this time, the CPU controls the first control signal GPIO1 to output 1, so as to keep the first switch component 300 in a turn-off state, and when the first logic signal IO1 is 0, the first switch component 300 is still in a turn-off state.
After the first switch component 300 is turned off, the path between the input voltage and the backlight driving chip DC/DC is disconnected, that is, the backlight driving chip DC/DC stops working, at this time, the large current at the rear end gradually disappears, the input voltage rises, and when the input voltage rises to the first voltage threshold or is higher than the first voltage threshold, the first logic signal IO1 output by the low-voltage comparison circuit 200 is 0. The first switching assembly 300 completes one switching operation.
In specific implementation, the CPU counts time and also records the number of times that the first switch assembly 300 completes switching, and if the number of times that the first switch assembly 300 completes switching is greater than an equal number threshold within a second preset time period, controls the first control signal GPIO1 to be a turn-off signal, i.e., a high level 1, and controls the first switch assembly 300 to turn off, so as to control the backlight driving chip DC/DC to stop working, thereby preventing explosion caused by a large current at the rear end, and improving the explosion resistance of the mobile terminal.
In an embodiment, after receiving the first logic signal IO1, the CPU100 may further detect a connection state between a display screen of the mobile terminal and the backlight driver chip; and if the connection state is not connection, controlling a second control signal GPIO2 output to an enable end EN of the backlight driving chip DC/DC to be a closing signal, and controlling the second control signal GPIO2 to be an opening signal after a first preset time length.
In a specific implementation, as shown in fig. 1b, the CPU100 may detect a connection state between the display screen and the backlight driver chip through a screen detection circuit, where the screen detection circuit may be an ADC detection circuit, and specifically detects serial voltage division of a pull-up resistor R located in the motherboard and a pull-down resistor R located in the display screen to detect whether the screen is connected, and similarly, the pull-up resistor R may also be in the display screen, and the pull-down resistor R may also be in the motherboard.
For example, VDD is 1.8V, the resistance values of the pull-up resistor R and the pull-down resistor are the same, if the CPU detects that the voltage at the connection point of the pull-up resistor R and the pull-down resistor is 0.9V, the connection of the confirmation screen is performed, otherwise, the confirmation screen is not connected.
According to the embodiment of the invention, whether the display screen is connected with the backlight driving chip is detected, if the display screen is connected with the backlight driving chip, the large current caused by the display screen fault can be determined, and if the display screen is not connected with the backlight driving chip, the large current caused by the looseness or the falling of the screen connector can be determined.
In a specific implementation, the CPU may control the second control signal GPIO2 to be the off signal while controlling the first control signal GPIO1 to be the off signal when determining that the number of times the first switching element 300 is switched within the first preset time period is greater than or equal to the number threshold. And controlling the second control signal GPIO2 to be a turn-off signal, namely, inputting a turn-off signal to the enable terminal EN of the backlight driving chip DC/DC to turn off the backlight driving chip DC/DC.
After the backlight driving chip is closed, the large current at the rear end can be thoroughly prevented, so that the explosion caused by the large current can be better prevented, and the explosion resistance of the mobile terminal is further improved.
For ease of understanding, the above process is described in detail below with reference to the flow diagram shown in fig. 2 and the block diagram of fig. 1 b.
The screen connector shown in fig. 1b is connected to the display screen, and the voltage output terminal of the backlight driver chip DC/DC is connected to the LEDA pin of the screen connector. In specific implementation, if a large current occurs at the back end, a short-circuit abnormal fault may occur on a back-end screen load, which may cause an abnormally large current to occur on a line connected to the LEDA, and at this time, due to the limitation of circuit power, the power is constant, so that the input voltage of the backlight driver chip DC/DC is pulled down. The low voltage comparison circuit 200 provided in the embodiment of the present invention can obtain an input voltage, and when the input voltage is lower than a first voltage threshold, output a first logic signal IO1 to control the first switch component 300 to be turned off, so as to avoid explosion caused by continuous large current at the rear end, and the specific process is as follows:
s201, the low-voltage comparison circuit 200 compares the input voltage with a first voltage threshold value and judges whether the input voltage is lower than the first voltage threshold value; if not, ending, if yes, executing S202;
s202, the first logic signal IO1 is inverted from 0 to 1, the first logic gate 400 outputs 1, and the first switch component 300 is turned off;
it should be noted that, in the embodiment of the invention, the first switch element 300 is a PMOS transistor, and the first logic gate 400 is an or gate, and other combinations of devices are only required to meet the inventive concept of the present application, and are not limited thereto.
In the embodiment of the present invention, 1 represents a high level, 0 represents a low level, 1 controls the first switch device 300 to be turned off, 0 controls the first switch device 300 to be turned on, the first switch device 300 is turned off, i.e., the path across the first switch device 300 is disconnected, and the first switch device 300 is turned on, i.e., the path across the first switch device 300 is conducted.
S203, the CPU100 detects whether a display screen of the mobile terminal is connected with a backlight driving chip, if not, S204 is executed, and if so, S209 is executed;
s204, the CPU100 controls the first control signal GPIO1 to be 1, the first switch component 300 keeps closed, controls the second control signal GPIO2 to be 0, and turns off the backlight driving chip to start timing and counting;
when the GPIO1 is 1, the or gate outputs 1 regardless of whether IO1 is 0 or 1, and thus the first switch element 300 remains in the off state; in the embodiment of the invention, 0 controls the backlight driving chip DC/DC to be closed, 1 controls the backlight driving chip DC/DC to be opened, the backlight driving chip DC/DC is closed, namely the backlight driving chip DC/DC is in a non-operating state no matter whether a power supply is switched on or not, and the backlight driving chip DC/DC is opened, namely the backlight driving chip DC/DC is in an operating state after the power supply is provided.
The timing mentioned here may be started after the CPU100 receives the signal inverted by the first logic signal IO1 for the first time;
the count is the number of times the first switch assembly 300 is turned on and off, and the count is recorded as one count. Specifically, when the low-voltage comparison circuit 200 detects that the input voltage is lower than the first voltage threshold, the output first logic signal IO1 is inverted from 0 in a normal condition to 1, the first logic gate 400 controls the first switch component 300 to be turned off, after receiving the first logic signal IO1, the CPU100 controls the first control signal GPIO1 to be a turn-off signal, the first switch component 300 maintains a turn-off state, the second control signal GPIO2 is controlled to be a turn-off signal, and the backlight driving chip is turned off; after the first preset time, the CPU100 controls the first control signal GPIO1 and the second control signal GPIO2 to be both the turn-on signals, when the input voltage recovers to the normal voltage value, the low-voltage comparison circuit 200 detects that the input voltage is greater than or equal to the first voltage threshold, the output first logic signal IO1 is inverted from 1 to 0, and the first control signal GPIO1 and the first logic signal IO1 enable the first logic gate 400 to output the turn-on signal, so as to control the first switch component 300 to be turned on. The low voltage comparing circuit 200 detects that the input voltage is lower than the first voltage threshold again, and the above process is repeated, and the count indicates the number of times the first switching element 300 is switched in the process.
S205, after the preset time T1, the CPU100 controls the first control signal GPIO1 to be 0 and controls the second control signal GPIO2 to be 1;
when the GPIO1 is 0, if IO1 is 0, the first logic gate outputs 0, which may control the first switch element 300 to turn on; GPIO2 is 1, namely the backlight driving chip DC/DC is turned on.
S206, when the low voltage comparison circuit 200 compares that the input voltage is greater than or equal to the first preset threshold, IO1 is inverted from 1 to 0, the first logic gate outputs 0, and the first switch component 300 is turned on;
in the above-described processes of S201 to S206, the CPU counts 1.
S207, the CPU100 determines whether the switching times of the first switch assembly 300 are greater than or equal to a first quantity threshold value within a preset time length T2; if yes, executing S208, otherwise executing S201;
in a specific implementation, the preset time period T2 is greater than the preset time period T1, and the first number threshold may be 3.
S208, the CPU100 controls the first control signal GPIO1 to be 1 and controls the second control signal GPIO2 to be 0;
the GPIO1 is 1, the first switching element 300 is turned off, the GPIO2 is 0, and the backlight driving chip is controlled to be turned off, in which S208, the backlight driving chip is completely turned off by the first control signal GPIO1 and the second control signal GPIO 2.
S209, the CPU100 controls the first control signal GPIO1 to be 1, and starts timing and counting;
s210, after the preset time T3, the CPU100 controls the first control signal GPIO1 to be 0;
s211, when the low voltage comparison circuit 200 compares that the input voltage is greater than or equal to the first preset threshold, IO1 is inverted from 1 to 0, the first logic gate outputs 0, and the first switch component 300 is turned on;
s212, the CPU100 determines whether the number of times the first switch assembly 300 is switched within the preset time period T4 is greater than or equal to a second number threshold; if yes, executing S208, otherwise executing S201;
the preset time length T4 is greater than the preset time length T3, and the preset time length T3 may be equal to or different from the preset time length T1; the preset time length T4 may be equal to or different from the preset time length T2; the second number threshold may be equal to the first number threshold, may be 3, or may be different.
It should be noted that the two processing modes of detecting the connection and the disconnection of the display screen are different, because when the connection of the display screen is detected, an abnormal fault occurs in the display screen body part (including the FPC, the Driver IC and the liquid crystal glass); when the disconnection of the screen is detected, the screen connector section is partially out of order or superimposed in at least two failure states.
If the display screen and the backlight driving chip are connected abnormally, for example, a connector connecting the display screen and the backlight driving chip is loosened or falls off, a large voltage may be generated, and the large voltage may also cause explosion easily.
In another embodiment, the driving control circuit provided by the present invention may further include a high voltage comparison circuit 500, a second switch assembly 600 and a second logic gate 700, as shown in fig. 3.
The high voltage comparison circuit 500 is configured to compare the output voltage of the backlight driver chip with a second voltage threshold, and output a second logic signal IO2 according to a second comparison result;
the second logic gate 700 is configured to control the second switch element 600 to be turned on or turned off according to the second logic signal IO2 and a third control signal GPIO3 output by the CPU 100;
a second switch assembly 600 for turning on a path between the first switch assembly 300 and the backlight driving chip DC/DC when turned on, and turning off the path between the first switch assembly 300 and the backlight driving chip DC/DC when turned off;
the CPU100 is further configured to control the third control signal GPIO3 to be a close signal after the received second logic signal IO2 is inverted, so as to control the second switch component to close.
It should be noted that, in the embodiment of the present invention, the working principles of the high voltage comparing circuit 500 and the low voltage comparing circuit 200 are similar, the working principles of the second logic gate 700 and the first logic gate 400 are similar, and the working principles of the second switch module 700 and the first switch module 300 are similar, which may specifically refer to the above description, and repeated parts are not repeated.
In the embodiment of the application, after receiving the second logic signal IO2, i.e. after a large voltage appears, that is, the output voltage is greater than or equal to the second voltage threshold, the CPU100 may control the third control signal GPIO3 to be a close signal to control the second switch component 700 to close, so that the backlight driver chip DC/DC stops working, thereby reducing the explosion caused by the large voltage and further improving the explosion resistance of the mobile terminal.
In a specific implementation, when the second logic signal IO2 is sent to the second logic gate 700 by the high voltage comparison circuit 500, the second logic signal IO2 may be sent to the CPU100 at the same time, and when the second logic signal IO2 is inverted, the second logic signal IO2 may be used as a second interrupt signal, that is, the second interrupt signal INT2 in fig. 3. After receiving the second interrupt signal INT2, the CPU100 may control the third control signal GPIO3 to be a turn-off signal.
In this embodiment of the present invention, after determining that the received second logic signal IO2 is inverted, the CPU100 may control the third control signal GPIO3 to be a turn-off signal, that is, a high level 1, because the second logic signal IO2 is inverted, that is, changed from 0 to 1, the second logic gate outputs 1, the second switch component 700 is turned off, and at this time, the CPU controls the third control signal GPIO3 to output 1, so as to keep the second switch component 700 in a turn-off state, and when the second logic signal IO2 is 0, the second switch component 700 is still in a turn-off state.
After the second switching assembly 700 is turned off, the path between the input voltage and the backlight driving chip DC/DC is cut off, i.e., the backlight driving chip DC/DC stops operating, and the large voltage gradually disappears, so that explosion due to the large voltage can be prevented.
In an embodiment, after determining that the received second logic signal IO2 is inverted, the CPU100 may detect a connection state between the display screen and the backlight driver chip DC/DC before controlling the third control signal GPIO2 to be a turn-off signal, and if the display screen and the backlight driver chip are normally connected, control the third control signal GPIO3 to be a turn-off signal, that is, directly disconnect a path between the input voltage and the backlight driver chip, so as to stop the backlight driver chip DC/DC from operating; if the display screen is normally connected with the backlight driving chip, the third control signal GPIO3 is controlled to be a turn-off signal (high level 1) while the second control signal GPIO2 is controlled to be a turn-off signal (low level 0), after a third preset time period, the CPU controls the third control signal GPIO3 to be a turn-on signal (low level 0) while the second control signal GPIO2 is controlled to be a turn-on signal (high level 1), the output voltage and the second voltage threshold value continue to be compared by the high-voltage comparison circuit, if the output voltage is still greater than or equal to the second voltage threshold value, the third control signal GPIO3 is controlled to be a turn-off signal (high level 1) to control the second switch assembly 700 to be turned off, a path between the input voltage and the backlight driving chip DC/DC is disconnected, so that the backlight driving chip stops working, if the output voltage is less than the second voltage threshold value, it is said that a large voltage does not occur, and the flow ends.
The high-voltage comparison circuit 500 provided by the embodiment of the invention can control the working state of the second switch assembly 600 through the second logic gate 700, if the LEDA at the screen connector is disconnected, the output feedback closed loop of the backlight driving chip can be disconnected, if the high-voltage comparison circuit 500 is not provided, the output voltage of the backlight driving chip can be rapidly increased, but when the output voltage is increased to the breakdown voltage of the voltage regulator tube, the voltage regulator tube can be conducted and clamps the output voltage of the backlight driving chip to a fixed level, the output voltage of the backlight driving chip cannot be as high as the overvoltage protection threshold of the backlight driving chip, but the voltage regulator tube is in a continuous discharge state, so that large current and heating of components can be caused, and explosion risks can be caused.
In addition, the voltage regulator tube is adopted to clamp the LEDA voltage on the output circuit, the basic design scheme belongs to the base protection, and although the effect of avoiding the occurrence of abnormal high voltage can be achieved, the voltage regulator tube has a certain power and large current when being in a breakdown clamping state.
It should be noted that the clamping voltage of the voltage regulator tube is significantly lower than the overvoltage protection threshold of the backlight driving chip itself, and the second voltage threshold of the high-voltage comparison circuit 500 provided in the embodiment of the present invention may be higher than the voltage of the display screen at the maximum backlight brightness and lower than the clamping voltage of the voltage regulator tube.
For ease of understanding, the above-described process will be described in detail below with reference to the flowchart shown in fig. 4 and the block diagram shown in fig. 3.
The disconnection of the pins of the screen connector LEDA is also a relatively common fault, when the connection of the LEDA at the screen connector is disconnected, the output voltage of the backlight driving chip DC/DC can be rapidly increased, and although a voltage-regulator tube can perform certain protection, the overvoltage protection mechanism of the backlight driving chip is damaged by the protection. The high-voltage comparison circuit 500 provided by the embodiment of the invention can be protected before the voltage regulator tube acts, so that the explosion resistance of the mobile terminal is improved, and the specific process is as follows:
s401, the high-voltage comparison circuit 500 compares the output voltage of the backlight driving chip with a second voltage threshold value, and judges whether the output voltage is greater than the second voltage threshold value; if not, ending, if yes, executing S402;
s402 and IO2 are inverted from 0 to 1, the second logic gate 700 outputs 1, and the second switch assembly 600 is turned off;
s403, after receiving the IO2 inverted second interrupt signal INT2, the CPU100 detects whether the display screen is connected with the backlight driving chip; if not, executing S404, if connected, executing S407;
it should be noted that before detecting whether the panel is still connected, since the output voltage is higher than the second voltage threshold, the second logic signal IO2 controls the second switch assembly 600 to be turned off through the second logic gate 700, and then since the second switch assembly 600 is turned off, the output voltage of the backlight driving chip may be reduced, and the second logic signal IO2 controls the second switch assembly 600 to be turned on through the second logic gate 700 again.
S404, the CPU100 controls the second control signal GPIO2 to be 0 and controls the third control signal GPIO3 to be 1;
GPIO2 is 0, and the backlight driving chip is closed; GPIO3 is 1, maintaining the state of the second switch element 600 as off. The state of the second switch assembly is the same as that of the first switch assembly, and the description thereof is omitted.
S405, after the CPU100 is in the preset time period T5, controlling the second control signal GPIO2 to be 1 and controlling the third control signal GPIO3 to be 0;
s406, the high-voltage comparison circuit 500 compares the output voltage of the backlight driving chip with a second voltage threshold value, and judges whether the output voltage is greater than the second voltage threshold value, if so, S407 is executed, otherwise, the operation is finished;
s407, the CPU100 controls the second control signal GPIO2 to be 0 and controls the third control signal GPIO3 to be 1.
GPIO2 is 0, and the backlight driving chip DC/DC is closed; GPIO3 is 1, and the second switch component is closed.
The drive control circuit provided by the embodiment of the invention can start protection before the voltage regulator tube, and is a protection mechanism for the voltage regulator tube of a reliable device.
Based on the same inventive concept, the embodiment of the present invention further provides a mobile terminal, and the implementation of the mobile terminal may refer to the implementation of the above circuit, and repeated details are not repeated.
As shown in fig. 5, the mobile terminal according to the embodiment of the present invention includes a display screen 51, a backlight driver chip 52 and any one of the driving control circuits 53 as described above, where the backlight driver chip 52 is connected to the display screen 51 through a screen connector, and the driving control circuit 53 is connected to the display screen 51 through a screen connector. As shown in fig. 5, the driving control circuit 53, the backlight driving chip 52 and the screen connector may be on the same circuit board, and the board and the display screen may be stacked in the mobile terminal. When the screen of the mobile terminal encounters an abnormal condition of a large voltage or a large current, the driving control circuit 53 can control the backlight driving chip 52 to be completely closed, so that the display screen 51 stops running, and the explosion resistance of the mobile terminal is improved.
Based on the same inventive concept, the embodiment of the present invention further provides a driving control method, which is applied to any one of the driving control circuits, and the implementation of the method can refer to the implementation of the above-mentioned circuit, and repeated details are not repeated. As shown in fig. 6, the method includes:
s601, after the received first logic signal IO1 is turned over, controlling the first control signal GPIO1 as a closing signal, and after a first preset time length, controlling the first control signal GPIO1 as an opening signal;
s602, determining that the number of times the first switch component 300 is switched within a second preset time period is greater than or equal to a number threshold, and controlling the first control signal GPIO1 as a turn-off signal to turn off the first switch component 300.
Optionally, the method further includes:
and after the number of times of switching the first switching component 300 within the second preset time period is determined to be greater than or equal to the number threshold, controlling the second control signal GPIO2 to be a closing signal.
Optionally, the method further includes:
after receiving the second logic signal IO2 and turning over, the third control signal GPIO3 is controlled to be a turn-off signal to turn off the second switch element 600.
Optionally, the method further includes:
and after the third control signal GPIO3 is controlled to be the closing signal, the second control signal GPIO2 is controlled to be the closing signal.
The embodiment of the invention provides a drive control circuit, a mobile terminal and a method, wherein the drive control circuit is applied to the mobile terminal, an input voltage of a backlight drive chip is compared with a first voltage threshold value through a low-voltage comparison circuit, a first logic signal is output according to a first comparison result, the first logic signal and the output first control signal control the opening or closing of a first switch component through the first logic signal, the first switch component conducts a path between the input voltage and the backlight drive chip when being opened, the path between the input voltage and the backlight drive chip is disconnected when being closed, the first control signal is controlled to be a closing signal after the first logic signal is overturned, the first control signal is controlled to be an opening signal after a first preset time, the number of switching times of the first switch component in a second preset time is determined to be larger than or equal to the number threshold value, and the first control signal is controlled to be a closing signal so as to control the first switch component to be closed. The CPU can control the first switch component to be closed and opened by controlling the signal state of the first control signal after the first logic signal is turned over, namely, the rear end has large current to cause the input voltage to be abnormal, and controls the first switch component to be closed after the number of times of the switching of the first switch component is determined to be more than or equal to the number threshold value within the second preset time period, so that the passage between the input voltage and the backlight driving chip is thoroughly disconnected, the backlight driving chip stops working, explosion caused by large current load can be reduced, and the explosion resistance of the mobile terminal is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Various modifications and alterations of this application may be made by those skilled in the art without departing from the spirit and scope of this application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A driving control circuit applied to a mobile terminal, comprising: the device comprises a processor CPU, a low-voltage comparison circuit, a first switch component and a first logic gate;
the low-voltage comparison circuit is used for comparing the input voltage of the backlight driving chip with a first voltage threshold value and outputting a first logic signal according to a first comparison result;
the first logic gate is used for controlling the first switch component to be opened or closed according to the first logic signal and a first control signal output by the CPU;
the first switch component is used for conducting a path between the input voltage and the backlight driving chip when the first switch component is started, and disconnecting the path between the input voltage and the backlight driving chip when the first switch component is closed;
the CPU is used for controlling the first control signal to be a closing signal after the received first logic signal is turned over, and controlling the first control signal to be an opening signal after a first preset time length; and determining that the switching times of the first switch component in a second preset time length are greater than or equal to a quantity threshold value, and controlling the first control signal to be a closing signal so as to control the first switch component to be closed.
2. The circuit of claim 1, wherein the CPU, upon receiving the first logic signal to flip, is further to:
detecting the connection state of a display screen of the mobile terminal and the backlight driving chip;
and if the connection state is not connection, controlling a second control signal output to an enabling end of the backlight driving chip to be a closing signal, and controlling the second control signal to be an opening signal after the first preset time length.
3. The circuit of claim 2, wherein after determining that the number of times the first switching element is switched on and off within the second predetermined period is greater than or equal to a quantity threshold and controlling the first control signal to be an off signal, the CPU is further configured to:
and controlling the second control signal to be a closing signal so as to close the backlight driving chip.
4. The circuit of any of claims 2-3, further comprising a high voltage comparison circuit, a second switching component, and a second logic gate;
the high-voltage comparison circuit is used for comparing the output voltage of the backlight driving chip with a second voltage threshold value and outputting a second logic signal according to a second comparison result;
the second logic gate is used for controlling the second switch component to be opened or closed according to the second logic signal and a third control signal output by the CPU;
the second switch component is used for conducting a path between the first switch component and the backlight driving chip when the second switch component is started, and disconnecting the path between the first switch component and the backlight driving chip when the second switch component is closed;
the CPU is further configured to control the third control signal to be a turn-off signal after the received second logic signal is inverted, so as to control the second switch component to be turned off.
5. The circuit of claim 4, wherein after the received second logic signal is toggled, and before the third control signal is controlled to be a shutdown signal, the CPU is further configured to:
detecting the connection state of the display screen and the backlight driving chip;
if the connection state is not connection, controlling both the second control signal and the third control signal to be off signals, and after a third preset time length, controlling both the second control signal and the third control signal to be on signals; determining that the received second logic signal is inverted again.
6. The circuit of claim 4, wherein after controlling the third control signal to be an off signal, the CPU is further configured to:
and controlling the second control signal to be a closing signal so as to close the backlight driving chip.
7. A mobile terminal comprising a display screen, a backlight driver chip and a drive control circuit according to any one of claims 1 to 6.
8. A drive control method applied to the drive control circuit according to any one of claims 1 to 6, the method comprising:
after the received first logic signal is turned over, controlling the first control signal to be a closing signal, and after a first preset time length, controlling the first control signal to be an opening signal;
and determining that the switching times of the first switch component in a second preset time length are greater than or equal to a quantity threshold value, and controlling the first control signal to be a closing signal so as to control the first switch component to be closed.
9. The method of claim 8, wherein the method further comprises:
and after the received second logic signal is inverted, controlling the third control signal to be a closing signal so as to close the second switch component.
10. The method of claim 9, wherein after said controlling said third control signal to be an off signal, the method further comprises:
and controlling a second control signal to be a closing signal so as to close the backlight driving chip.
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |
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