CN209265378U - Reset circuit and display terminal - Google Patents
Reset circuit and display terminal Download PDFInfo
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- CN209265378U CN209265378U CN201920216205.1U CN201920216205U CN209265378U CN 209265378 U CN209265378 U CN 209265378U CN 201920216205 U CN201920216205 U CN 201920216205U CN 209265378 U CN209265378 U CN 209265378U
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Abstract
The utility model discloses a reset circuit and display terminal relates to electronic circuit technical field. The reset circuit includes: the power supply control module, the locking protection reset module and the chip module receive a failure signal of the chip module through the locking protection reset module, generate a first control signal and output the first control signal to the power supply control module so as to control the power supply control module to stop outputting a power supply voltage signal to a power input pin of the chip module, so that the chip module completes resetting. The utility model provides a when voltage unusual among the prior art drops, the unable automatic recovery of display terminal goes up the problem of electricity, circuit structure is simple, reduces circuit cost and consumption.
Description
Technical field
The utility model embodiment is related to electronic circuit technology field more particularly to a kind of reset circuit and display terminal.
Background technique
For display terminal, when falling supply voltage moment, display terminal starts backlight defencive function, so that display is eventually
There is blank screen in the display screen at end, so that the information such as corresponding pictograph can not be shown, until internal power supply plate residual electric energy is complete
After portion's consumption, display terminal powers on again, and the display screen of display terminal can normally be shown, thus will will affect user experience.
Utility model content
In view of this, the utility model embodiment provides a kind of reset circuit and display terminal, it is able to solve existing skill
It can not automatically reset after display terminal power down in art, thus the technical issues of influencing user experience.
The utility model embodiment provides a kind of reset circuit, comprising: power control module, locked protection reseting module
And chip module；
Wherein, the first control terminal of the locked protection reseting module and the disablement signal pin of the chip module are electrically connected
It connects, the second control terminal of the locked protection reseting module is electrically connected with the control terminal of the power control module；
The output end of the power control module is electrically connected with the power input pin of the chip module, is used for described
Power input pin exports supply voltage signal, for chip module power supply；
The locked protection reseting module, the disablement signal for being exported according to the disablement signal pin generate first
Signal is controlled, and the first control signal is exported to the power control module；
The power control module is also used to stop the power supply to the chip module according to the first control signal
Input pin exports supply voltage signal.
Optionally, the locked protection reseting module includes: reset circuit submodule and charging circuit submodule；
First control terminal of the first end of the reset circuit submodule as the locked protection reseting module, it is described multiple
The second end of position circuit submodule is electrically connected with the power input pin of the chip module；
The first input end of the charging circuit submodule is electrically connected with the output end of the reset circuit submodule, described
Second input terminal of charging circuit submodule is for connecting dimmer voltage end, and the output end of the charging circuit submodule is as institute
State the second control terminal of locked protection reseting module；
The reset circuit submodule, the disablement signal and the power supply for exporting according to the disablement signal pin are defeated
Enter the supply voltage signal of pin, generates charging control signal, and the charging control signal is exported to the charging circuit
Submodule is charged with triggering the dimmer voltage signal that the charging circuit submodule is exported according to the dimmer voltage end；
The charging circuit submodule generates first control signal for reaching preset threshold in charge capacity.
Optionally, the reset circuit submodule includes: resistance and transistor, and the resistance includes first resistor, second
Resistance and 3rd resistor, the transistor include the first transistor and second transistor；
The control terminal of the first transistor is electrically connected by the first resistor with the disablement signal pin, and described
The control terminal of one transistor is electrically connected by the second resistance with the power input pin, and the first of the first transistor
End is electrically connected with the control terminal of the second transistor；
The control terminal of the second transistor is electrically connected by the 3rd resistor with backlight control end, the backlight control
End is for exporting backlight control signal；
The backlight control signal is used in the first transistor cut-off, provides driving electricity for the second transistor
Stream；
The second transistor is used to generate charging control signal, and fill described in the first transistor conducting
Electric control signal is transferred to the charging circuit submodule.
Optionally, the reset circuit submodule further include: the first filter unit and the second filter unit；
The input terminal of first filter unit is electrically connected with the control terminal of the first transistor, and first filtering is single
The output end ground connection of member, is filtered for the received electric signal of control terminal to the first transistor；
The input terminal of second filter unit is electrically connected with the control terminal of the second transistor, and second filtering is single
The output end ground connection of member, is filtered for the received electric signal of control terminal to the second transistor.
Optionally, the reset circuit submodule further include: the first voltage regulation unit；
The input terminal of first voltage regulation unit is electrically connected with the power input pin, first voltage regulation unit it is defeated
Outlet is electrically connected with the control terminal of the first transistor, for stablizing the confession for being input to the first transistor control terminal
Piezoelectric voltage signal.
Optionally, the charging circuit submodule includes: charging capacitor and third transistor；
The first end of the charging capacitor is electrically connected with the output end of the reset circuit submodule, the charging capacitor
Second end ground connection；
The control terminal of the third transistor is electrically connected with the first end of the charging capacitor, and the of the third transistor
One end is electrically connected with the power control module control terminal, the second end ground connection of the third transistor；
The dimmer voltage signal of the dimmer voltage end output is for charging to the charging capacitor；
The third transistor is used for when the charge volume of the charging capacitor reaches preset threshold, generates the first control letter
Number.
Optionally, the charging circuit submodule further include: the first isolated location and the second isolated location；
The first end of first isolated location connects the dimmer voltage end, and the other end connects the of the charging capacitor
One end and second isolated location；
The control terminal of the third transistor passes through one end of second isolated location and first isolated location electricity
Connection.
Optionally, the charging circuit submodule further include: third filter unit；
The first end of the third filter unit is electrically connected with the control terminal of the third transistor, and the third filtering is single
The second end ground connection of member, is filtered for the received electric signal of control terminal to the third transistor.
Optionally, the power control module includes: the 4th transistor and the second voltage regulation unit；
The control terminal of 4th transistor is electrically connected with the second control terminal of the locked protection reseting module, and described the
The first end of four transistors is electrically connected with supply voltage end, the second end of the 4th transistor and power input pin electricity
Connection；
The first end of second voltage regulation unit is electrically connected with the control terminal of the 4th transistor, the second pressure stabilizing list
The second end ground connection of member.
Optionally, the power control module further include: the 4th filter unit；
The first end of 4th filter unit is electrically connected with the first end of the 4th transistor, and the 4th filtering is single
The second end of member is electrically connected with the control terminal of the 4th transistor, for terminating to the 4th transistor controls end and first
The electric signal of receipts is filtered.
Second aspect, the utility model embodiment additionally provide a kind of display terminal, which includes: such as first party
Reset circuit described in face.
The utility model receives the disablement signal of chip module by locked protection reseting module, generates the first control letter
Number, and the first control signal is exported to power control module, stops electricity to chip module to control power control module
Source input pin exports supply voltage signal, so that chip module is completed to reset, that is, solves electric voltage exception in the prior art and falls
When falling, display terminal can not restore automatically the problem of powering on, and circuit structure is simple, reduce circuit cost and power consumption.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of reset circuit provided by the embodiment of the utility model；
Fig. 2 is the structural schematic diagram of another reset circuit provided by the embodiment of the utility model；
Fig. 3 is a kind of electrical block diagram of reset circuit submodule provided by the embodiment of the utility model；
Fig. 4 is the electrical block diagram of another reset circuit submodule provided by the embodiment of the utility model；
Fig. 5 is the electrical block diagram of another reset circuit submodule provided by the embodiment of the utility model；
Fig. 6 is the electrical block diagram of another reset circuit submodule provided by the embodiment of the utility model；
Fig. 7 is a kind of electrical block diagram of filter unit provided by the embodiment of the utility model；
Fig. 8 is a kind of electrical block diagram of charging circuit submodule provided by the embodiment of the utility model；
Fig. 9 is the electrical block diagram of another charging circuit submodule provided by the embodiment of the utility model；
Figure 10 is a kind of electrical block diagram of power control module provided by the embodiment of the utility model；
Figure 11 is the electrical block diagram of another power control module provided by the embodiment of the utility model；
Figure 12 is a kind of structural schematic diagram of the physical circuit of reset circuit provided by the embodiment of the utility model；
Figure 13 is a kind of structural schematic diagram of display terminal provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.Do not conflicting
In the case where, the feature in the utility model embodiment and embodiment can be combined with each other.
Referring to Fig.1, a kind of structural schematic diagram of reset circuit of the utility model embodiment is shown.The reset circuit can
To include: power control module 110, locked protection reseting module 120 and chip module 130.Wherein, protection reseting module is locked
120 the first control terminal C21 is electrically connected with the disablement signal pin Fail of chip module 130, locks protection reseting module 120
Second control terminal C22 is electrically connected with the control terminal C11 of power control module 110；The output end vo 10 of power control module 110 with
The power input pin VCC of chip module 130 is electrically connected, for exporting supply voltage signal to power input pin VCC, with for
Chip module 130 is powered.Locked protection reseting module 120, the disablement signal for being exported according to disablement signal pin Fail produce
Raw first control signal, and the first control signal is exported to power control module 110；Power control module 110, is also used to
According to first control signal, stop exporting supply voltage signal to the power input pin VCC of chip module 130.
In the present embodiment, chip module 130 includes at least power input pin VCC and disablement signal pin Fail.Wherein,
When chip module 130 is normal operating conditions, power control module 110 is that the power input pin VCC of chip module 130 is mentioned
For supply voltage signal, to make chip module 130 work for the power supply of chip module 130；And when chip module 130 is abnormal work
When making state, the disablement signal pin Fail of chip module 130 exports disablement signal, locks protection reseting module 120 at this time and connects
The disablement signal of the disablement signal pin Fail output of chip module 130 is received, and according to the disablement signal to power control module
130 output first control signals, so that power control module 130 according to the first control signal, stops to chip module 130
Power input pin VCC provides supply voltage signal.Thus 130 power input pin VCC unpowered voltage signal of chip module
Input, chip module 130 stop working, and chip module 130 resets.
Meanwhile after chip module 130 stops working, the disablement signal pin Fail of chip module 130 no longer exports failure
Signal locks control of the protection releasing of reseting module 120 to power control module 110, so that power control module 110 can be again
The secondary power input pin VCC for chip module 130 provides supply voltage signal, and chip module 130 restores to work normally.
In the concrete realization, chip module 130 can control display terminal and be shown, which for example can be
DTV, computer, computer flat panel, projector or interactive intelligent tablet computer etc..In the input voltage powered-off fault of display terminal, and
When the power input pin VCC of chip module 130 keeps receiving the supply voltage signal that power control module 110 provides, chip
Module 130 controls display terminal for entry of backlight guard mode, and chip module 130 will enter locked guard mode, display terminal
It will be unable to normally show.The disablement signal pin Fail of chip module 130 exports corresponding disablement signal at this time, and it is multiple to lock protection
Position module 120 receives the disablement signal, and generates first control signal and be sent to power control module 110, so that power supply control
Module 110 stops providing supply voltage to chip module 130, chip module 130 resets according to the first control signal.Chip
After module 130 resets, power control module 110 can continue to provide supply voltage signal to chip module 130, so that chip module
130 work normally, to be not necessarily to manual intervention in display terminal input voltage exception, display terminal can be made to automatically reply
Normal display, and then achieve the purpose that improve user experience.
It should be noted that chip module 130 can be for integrated chip, single-chip microcontroller etc., power control module 110 and locked
Protection reseting module 120 can realize its function by specific electronic component, be not especially limited to this.
On the basis of the above embodiments, optionally, as shown in Fig. 2, locked protection reseting module 120 includes: to reset electricity
Way module 121 and charging circuit submodule 122.The first end of reset circuit submodule 121 is as locked protection reseting module
120 the first control terminal C21, the second end Vi21 of reset circuit submodule 121 and the power input pin of chip module 130
VCC electrical connection.The first input end Vi221 of charging circuit submodule 122 and 21 electricity of output end vo of reset circuit submodule 121
Connection, the second input terminal Vi222 of charging circuit submodule 122 is for connecting dimmer voltage end ADJ, charging circuit submodule
Second control terminal C22 of 122 output end as locked protection reseting module 120.Reset circuit submodule 121 is used for foundation
The disablement signal of disablement signal pin Fail output and the supply voltage signal of power input pin VCC, generate charge control letter
Number, and the charging control signal line is exported to charging circuit submodule 122, to trigger charging circuit submodule 122 according to tune
The dimmer voltage signal of photoelectricity pressure side ADJ output charges；Charging circuit submodule 122, for reaching pre- in charge capacity
If threshold value, first control signal is generated.
In the present embodiment, the charge capacity of charging circuit submodule 122 has certain preset threshold, in charging circuit
When the charge capacity of module 122 reaches preset threshold, charging circuit submodule 122 is controlled to the output of power control module 110 first
Signal processed, so that power control module 110 is resetted according to first control signal control chip module 130.When reset circuit
The confession of disablement signal and power input pin VCC that the disablement signal pin Fail that module 121 receives chip module 130 is issued
When piezoelectric voltage signal, charging control signal is generated, and the charging control signal is exported to charging circuit submodule 122, so that
Charging circuit submodule 122 can according to the charging control signal, according to dimmer voltage end ADJ output dimmer voltage signal into
Row charging.The dimmer voltage signal of dimmer voltage end ADJ output starts to charge to charging circuit charging circuit submodule 122
The charge capacity of module 122 reaches preset threshold, has certain delay time, can judge chip module by the delay time
130 locked guard mode when whether being electric voltage exception power down, so as to prevent false triggering phenomenon from generating.
Wherein, which for example can be the time of display terminal input voltage powered-off fault, and thus, it is possible to judge
Out 130 disablement signal pin Fail of chip module issue disablement signal, be due to display terminal input voltage powered-off fault and
It generates, prevents disablement signal pin Fail in other situations from issuing component damage in disablement signal, such as display terminal with this
Bad, itself program of chip module 130 error etc., if resetting at this time to chip module 130, will be unfavorable for display terminal just
The often normal work of display and chip module 130.
It should be noted that the delay time that the charge capacity of charging circuit submodule 122 reaches preset threshold not only may be used
Think the time of display terminal input voltage powered-off fault.In other embodiments of the present invention, not influence display terminal normal
In the case where display, which may be that other abnormalities of display terminal are held time.Wherein, reset circuit
Corresponding electronic component can be used to realize its function in module 121 and charging circuit submodule 122.
In the utility model an optional embodiment, optionally, in conjunction with Fig. 2 and Fig. 3, reset circuit submodule packet
It includes: resistance and transistor.Wherein, resistance includes first resistor R1, second resistance R2 and 3rd resistor R3, and transistor includes first
Transistor Q1 and second transistor Q2.The control terminal of the first transistor Q1 passes through the failure of first resistor R1 and chip module 130
Signal pins Fail electrical connection, the control terminal of the first transistor Q1 pass through the power input of second resistance R1 and chip module 130
Pin VCC electrical connection, the first end of the first transistor Q1 are electrically connected with the control terminal of second transistor Q2；Second transistor Q2's
Control terminal is electrically connected by 3rd resistor R3 with backlight control end BL_ON, and the backlight control end BL_ON is for exporting backlight control
Signal, the backlight control signal are used to provide driving current in the first transistor Q1 cut-off for second transistor Q2；Second is brilliant
Body pipe Q2 is used to generate charging control signal, and the charging control signal is transferred to charging in the first transistor Q1 conducting
Circuit submodule 122.
In the concrete realization, the first transistor Q1 and second transistor Q2 are chosen as NPN type triode.Chip module 130
Working condition may include normal operating conditions and abnormal operation.When chip module 130 is normal operating conditions, chip dies
The disablement signal pin Fail of block 130 pulls down to ground；When chip module 130 is abnormal operation, the failure of chip module 130
Signal pins Fail is released.
In conjunction with Fig. 2 and Fig. 4, when chip module 130 is in normal operating conditions, as shown in thick lines in Fig. 4, chip dies
Node A is pulled down to ground by first resistor R1 by the disablement signal pin Fail of block 130, causes the control terminal of the first transistor Q1
Input low level.End when being low level for NPN type triode control terminal, the first transistor Q1 is in off state.At this point, back
The backlight control signal of photocontrol end BL_ON output is input to the control of second transistor Q2 after dividing by 3rd resistor R3
The output end vo 21 at end, second transistor Q2 conducting, reset circuit submodule 121 is pulled to by the second transistor Q2 be connected
The dimmer voltage signal of the charging control signal control dimmer voltage end ADJ output of ground, i.e. reset circuit submodule 121 output is not
It charges for charging circuit submodule 122.Correspondingly, power control module 110 is the power input pin of chip module 130
VCC provides supply voltage signal, so that chip module 110 works normally.
In conjunction with Fig. 2 and Fig. 5, when chip module 130 is in abnormal operation, as shown in thick lines in Fig. 5, such as core
When piece module 130 is locked guard mode, the disablement signal pin Fail of chip module 130 will be pulled down to by first resistor R1
The node A on ground is decontroled.The supply voltage signal of the power input pin VCC input of chip module 130 is input to reset circuit
Module 121, and the control terminal of the first transistor Q1, the first transistor Q1 conducting are input to after dividing by second resistance R2.It leads
Node B is pulled down to ground, the control terminal input low level of second transistor Q2 by logical the first transistor Q1, and second transistor Q2 is cut
Only, the output end vo 21 of reset circuit submodule 121 is released, the charging control signal control that reset circuit submodule 121 exports
The dimmer voltage signal of ADJ output in dimmer voltage end processed is that charging circuit submodule 122 charges.Correspondingly, in charging electricity
When the charge capacity of way module 122 reaches preset threshold, first control signal is generated, so that power control module 110 stops
Supply voltage signal is provided for the power input pin VCC of chip module 130, so that chip module 110 resets.
It should be noted that the dimmer voltage signal of dimmer voltage end ADJ output can be used for adjusting the display of display terminal
Brightness, the dimmer voltage signal for example can modulate (Pulse Width Modulation, PWM) signal for a pulse width；
The backlight chip that the backlight control signal of backlight control end BL_ON output can be used for controlling display terminal simultaneously works.By
This can simplify circuit structure, reduce cost.
In addition, optional, in conjunction with Fig. 2 and Fig. 6, reset circuit submodule 121 further includes the first filter unit W1 and second
Filter unit W2.Wherein, the input terminal of the first filter unit W1 is electrically connected with the control terminal of the first transistor Q1, and the first filtering is single
The output end of first W1 is grounded, and is filtered for the received electric signal of control terminal to the first transistor Q1, so that first
The signal of transistor Q1 control terminal input can accurately control the first transistor Q1；The input of second filter unit W2
End is electrically connected with the control terminal of second transistor Q2, the output end ground connection of the second filter unit W2, for second transistor W2
The received electric signal of control terminal be filtered so that second transistor Q2 control terminal input signal can to second crystalline substance
Body pipe Q2 is accurately controlled.Wherein, RC parallel circuit can be used in the first filter unit W1 and the second filter unit W2
It realizes.Illustratively, as shown in fig. 7, filter unit may include the resistance R11 and capacitor C11 in parallel with resistance R11.
Optionally, continuing with referring to figs. 2 and 6, to enable the second end Vi21 of reset circuit submodule 121 to stablize
Supply voltage signal is input to the control terminal of the first transistor Q1 by ground, and reset circuit submodule 121 further includes the first pressure stabilizing list
First ZD1.The input terminal of first voltage regulation unit ZD1 is electrically connected with power input pin VCC, the output end of the first voltage regulation unit ZD1
It is electrically connected with the control terminal of the first transistor Q1, for stablizing the supply voltage signal for being input to the first transistor Q1 control terminal.
Illustratively, first voltage regulation unit ZD1 may include zener diode.
In another optional embodiment of the utility model, optionally, in conjunction with shown in Fig. 2 and Fig. 8, charging circuit submodule
Block 122 includes: charging capacitor C1 and third transistor Q3.The first end of charging capacitor C1 is as charging circuit submodule 122
First input end Vi221, the first end Vi221 of charging capacitor C1 are electrically connected with the output end vo 21 of reset circuit submodule 121
It connects, the second end ground connection of charging capacitor C 2；The control terminal of third transistor Q3 is electrically connected with the first end of charging capacitor C1, the
The first end of three transistor Q1 is electrically connected with 110 control terminal of power control module, the second end ground connection of third transistor Q3；Light modulation
The dimmer voltage signal of voltage end ADJ output is for charging to charging capacitor C1；Third transistor Q3 is used in charging electricity
When the charge volume of appearance C1 reaches preset threshold, first control signal is generated.
In the concrete realization, third crystal light Q3 is chosen as N-channel depletion mode fet.Charging circuit submodule
122 first input end Vi221 receives the charging control signal of 121 output end vo 21 of reset circuit submodule output, and foundation
The dimmer voltage signal of charging control signal control dimmer voltage end ADJ output charges to charging capacitor C1.Work as charging
When charge capacity in capacitor C1 reaches preset threshold, which can for example open for that can control third transistor Q3
Threshold voltage, at this time third transistor Q3 open, with to power control module 110 send first control signal, control power supply
Control module 110 stops inputting supply voltage signal to the power input pin VCC of chip module 130, thus chip module 130
It resets.
Optionally, as shown in figure 9, charging circuit submodule 122 further includes the first isolated location D1 and the second isolated location
D2.Wherein, the first end of the first isolated location D1 connects dimmer voltage end ADJ, and the other end connects the first end of charging capacitor C1
With the second isolated location D2；The control terminal of third transistor Q3 passes through one end of the second isolated location D2 and the first isolated location D1
Electrical connection.The dimmer voltage signal that dimmer voltage end ADJ output can be isolated in first isolated location D1 is input to charging capacitor C1,
The dimmer voltage signal that dimmer voltage end ADJ output can be isolated in second isolated location D2 is input to the control of third transistor Q3
End.
Optionally, with continued reference to Fig. 9, charging circuit submodule 122 further includes third filter unit W3.Wherein, third is filtered
The first end of wave unit W3 is electrically connected with the control terminal of third transistor Q3, and the second end ground connection of third filter unit W3 is used for
The received electric signal of the control terminal of third transistor Q3 is filtered, to realize the accurate control to third transistor Q3
System.
It should be noted that third filter unit W3 is chosen as including RC parallel circuit, as shown in Figure 7.And in charging electricity
It is adjusted in way module 122 by the charging rate to charging capacitor C1, realizes circuit delay function, thus in charging electricity
When 122 output end of way module is as locked the second control terminal C22 for protecting reseting module 120, charging circuit submodule is filtered out
The first control signal of 122 output false triggerings.Wherein, the adjustment of charging capacitor C1 charging rate can pass through in parallel and/or string
Join corresponding resistance.Corresponding RC resonance circuit is formed to realize.
In another optional embodiment of the utility model, optionally, in conjunction with Fig. 2 and Figure 10, power control module 110
Including the 4th transistor Q4 and the second voltage regulation unit ZD2.Control of the control terminal of 4th transistor Q4 as power control module 110
End C11 processed, the control terminal of the 4th transistor Q4 are electrically connected with the second control terminal C22 of locked protection reseting module 120, and the 4th
The first end of transistor Q4 is electrically connected with supply voltage end VIN, and the second end of the 4th transistor Q4 is as power control module 110
Output end vo 10, the second end of the 4th transistor Q4 is electrically connected with power input pin VCC；Second voltage regulation unit ZD2's
First end is electrically connected with the control terminal of the 4th transistor Q4, the second end ground connection of the second voltage regulation unit ZD2.
In the concrete realization, the second voltage regulation unit ZD2 can stablize the signal of the 4th transistor Q4 control terminal of input.Example
Property, the second voltage regulation unit ZD2 can protect zener diode, and the 4th transistor Q4 is chosen as NPN type triode.When the 4th crystalline substance
The control terminal of body pipe Q4 receives the first control of locked protection reseting module 120 as the control terminal C11 of power control module 110
When signal, the control terminal of the 4th transistor Q4 is pulled to ground, the 4th transistor Q4 cut-off, the power supply of supply voltage end VIN output
Voltage signal can not be input to chip module 130 by the output end vo 10 of the 4th transistor Q4 and power control module 110
Power input pin VCC, so that chip 130 be made to reset.
Optionally, as shown in figure 11, power control module 110 further includes the 4th filter unit W4.4th filter unit
The first end of W4 is electrically connected with the first end of the 4th transistor Q4, and the second end of the 4th filter unit W4 is with the 4th transistor Q4's
Control terminal electrical connection, for being filtered to the 4th transistor Q4 control terminal and the received electric signal of first end, to realize
4th transistor Q4 is precisely controlled.Illustratively, the 4th filter unit may include RC parallel circuit, as shown in Figure 7
RC parallel circuit.
On the basis of the above embodiments, protection reseting module is locked in reset circuit provided by the embodiment of the utility model
It can also include partial pressure and/or current-limiting resistance with power control module, to realize the electric current for inputting each electronic component in circuit
And/or the partial pressure and current limliting of voltage.
Referring to Fig.1 2, show a kind of structural schematic diagram of the physical circuit of reset circuit of the utility model embodiment.
Wherein, part identical with the various embodiments described above repeats no more again, is only illustrated to the unmentioned part of above-described embodiment.
The reset circuit submodule 121 of locked protection reset circuit is additionally provided with the 4th resistance R4, with brilliant to input first
The electric signal of body pipe Q1 is divided；First filter unit of reset circuit submodule 121 includes the electricity of the 5th resistance R5 and second
Hold C2, the second filter unit of reset circuit submodule 121 includes the 6th resistance R6 and third capacitor C3, reset circuit submodule
121 the first voltage regulation unit includes zener diode ZD1.
The charging circuit submodule 122 of locked protection reset circuit is additionally provided with the 7th resistance R7, the 8th resistance R8, the 9th
Resistance R9 and the tenth resistance R10.Wherein, the 7th resistance R7, the 8th resistance R8 and the tenth resistance R10 are used for input third crystal
The electric signal of pipe Q3 is divided, and the 9th resistance R9 is used to carry out current limliting to the electric signal of input third transistor Q3.And it charges
The time that the charge capacity of capacitor C1 reaches preset threshold can be by the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9
Resistance value is adjusted to limit.The third filter unit of charging circuit submodule 122 includes eleventh resistor R11 and the 4th capacitor
C4。
Power control module 110 is additionally provided with twelfth resistor R12, for input the 4th transistor Q4 electric signal into
Row partial pressure.Second voltage regulation unit of power control module 110 includes zener diode ZD2, the 4th filter of power control module 110
Wave unit includes the 13rd resistance R13 and the 5th capacitor C5.
It should be noted that Figure 12 is only the illustrative electrical block diagram of the utility model embodiment, in this realization
Under the premise of utility model technical principle, other flexible circuits are the protection of reset circuit provided by the embodiment of the utility model
Range.
Referring to Fig.1 3, show the structural block diagram of one of the utility model embodiment display terminal.The display terminal
200 may include: reset circuit 100 described in above-described embodiment.
It should be noted that display terminal can also include the electricity consumptions such as power panel, PC module, power amplifier module, mainboard
Equipment, backlight module etc., such as can be DTV, computer, computer flat panel, projector or interactive intelligent tablet computer, this is practical
It is novel to this with no restriction.
Above-mentioned display terminal may include reset circuit 100 provided by the utility model any embodiment, have practical
The corresponding functional module of reset circuit 100 provided by novel and beneficial effect.
It should be noted that for display terminal embodiment, due to itself and the basic phase of 100 embodiment of reset circuit
Seemingly, so being described relatively simple, related place illustrates referring to the part of 100 embodiment of reset circuit.
It is worth noting that, included modules are only drawn according to function logic in above-mentioned reset circuit 100
Point, but be not limited to the above division, as long as corresponding functions can be realized；In addition, each functional unit is specific
Title is also only for convenience of distinguishing each other, the protection scope being not intended to limit the utility model.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (11)
1. a kind of reset circuit characterized by comprising power control module, locked protection reseting module and chip module；
Wherein, the first control terminal of the locked protection reseting module is electrically connected with the disablement signal pin of the chip module,
Second control terminal of the locked protection reseting module is electrically connected with the control terminal of the power control module；
The output end of the power control module is electrically connected with the power input pin of the chip module, is used for the power supply
Input pin exports supply voltage signal, for chip module power supply；
The locked protection reseting module, the disablement signal for being exported according to the disablement signal pin generate the first control
Signal, and the first control signal is exported to the power control module；
The power control module is also used to stop the power input to the chip module according to the first control signal
Pin exports supply voltage signal.
2. reset circuit according to claim 1, which is characterized in that the locked protection reseting module includes: to reset electricity
Way module and charging circuit submodule；
First control terminal of the first end of the reset circuit submodule as the locked protection reseting module, the reset electricity
The second end of way module is electrically connected with the power input pin of the chip module；
The first input end of the charging circuit submodule is electrically connected with the output end of the reset circuit submodule, the charging
Second input terminal of circuit submodule is for connecting dimmer voltage end, and the output end of the charging circuit submodule is as the lock
Second control terminal of dead protection reseting module；
The reset circuit submodule, disablement signal and the power input for exporting according to the disablement signal pin are drawn
The supply voltage signal of foot generates charging control signal, and the charging control signal is exported to the charging circuit submodule
Block is charged with triggering the dimmer voltage signal that the charging circuit submodule is exported according to the dimmer voltage end；
The charging circuit submodule generates first control signal for reaching preset threshold in charge capacity.
3. reset circuit according to claim 2, which is characterized in that the reset circuit submodule includes: resistance and crystalline substance
Body pipe, the resistance include first resistor, second resistance and 3rd resistor, and the transistor includes that the first transistor and second are brilliant
Body pipe；
The control terminal of the first transistor is electrically connected by the first resistor with the disablement signal pin, and described first is brilliant
The control terminal of body pipe is electrically connected by the second resistance with the power input pin, the first end of the first transistor with
The control terminal of the second transistor is electrically connected；
The control terminal of the second transistor is electrically connected by the 3rd resistor with backlight control end, and the backlight control end is used
In output backlight control signal；
The backlight control signal is used to provide driving current in the first transistor cut-off for the second transistor；
The second transistor is used in the first transistor conducting, generates charging control signal, and the charging is controlled
Signal processed is transferred to the charging circuit submodule.
4. reset circuit according to claim 3, which is characterized in that the reset circuit submodule further include: the first filter
Wave unit and the second filter unit；
The input terminal of first filter unit is electrically connected with the control terminal of the first transistor, first filter unit
Output end ground connection, is filtered for the received electric signal of control terminal to the first transistor；
The input terminal of second filter unit is electrically connected with the control terminal of the second transistor, second filter unit
Output end ground connection, is filtered for the received electric signal of control terminal to the second transistor.
5. reset circuit according to claim 3, which is characterized in that the reset circuit submodule further include: first is steady
Press unit；
The input terminal of first voltage regulation unit is electrically connected with the power input pin, the output end of first voltage regulation unit
It is electrically connected with the control terminal of the first transistor, for stablizing the power supply electricity for being input to the first transistor control terminal
Press signal.
6. reset circuit according to claim 2, which is characterized in that the charging circuit submodule includes: charging capacitor
And third transistor；
The first end of the charging capacitor is electrically connected with the output end of the reset circuit submodule, and the second of the charging capacitor
End ground connection；
The control terminal of the third transistor is electrically connected with the first end of the charging capacitor, the first end of the third transistor
It is electrically connected with the power control module control terminal, the second end ground connection of the third transistor；
The dimmer voltage signal of the dimmer voltage end output is for charging to the charging capacitor；
The third transistor is used for when the charge volume of the charging capacitor reaches preset threshold, generates first control signal.
7. reset circuit according to claim 6, which is characterized in that the charging circuit submodule further include: first every
From unit and the second isolated location；
The first end of first isolated location connects the dimmer voltage end, and the other end connects the first end of the charging capacitor
With second isolated location；
The control terminal of the third transistor is electrically connected by second isolated location with one end of first isolated location.
8. reset circuit according to claim 6, which is characterized in that the charging circuit submodule further include: third filter
Wave unit；
The first end of the third filter unit is electrically connected with the control terminal of the third transistor, the third filter unit
Second end ground connection, is filtered for the received electric signal of control terminal to the third transistor.
9. reset circuit according to claim 1, which is characterized in that the power control module includes: the 4th transistor
With the second voltage regulation unit；
The control terminal of 4th transistor is electrically connected with the second control terminal of the locked protection reseting module, and the described 4th is brilliant
The first end of body pipe is electrically connected with supply voltage end, and the second end of the 4th transistor is electrically connected with the power input pin
It connects；
The first end of second voltage regulation unit is electrically connected with the control terminal of the 4th transistor, second voltage regulation unit
Second end ground connection.
10. reset circuit according to claim 9, which is characterized in that the power control module further include: the 4th filtering
Unit；
The first end of 4th filter unit is electrically connected with the first end of the 4th transistor, the 4th filter unit
Second end is electrically connected with the control terminal of the 4th transistor, for received to the 4th transistor controls end and first end
Electric signal is filtered.
11. a kind of display terminal, which is characterized in that the display terminal includes any reset in claims 1 to 10
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216205.1U CN209265378U (en) | 2019-02-20 | 2019-02-20 | Reset circuit and display terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216205.1U CN209265378U (en) | 2019-02-20 | 2019-02-20 | Reset circuit and display terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209265378U true CN209265378U (en) | 2019-08-16 |
Family
ID=67585098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920216205.1U Active CN209265378U (en) | 2019-02-20 | 2019-02-20 | Reset circuit and display terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209265378U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271704A (en) * | 2020-11-16 | 2021-01-26 | 深圳市德兰明海科技有限公司 | Power-down protection circuit and integrated chip |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
| WO2022111416A1 (en) * | 2020-11-27 | 2022-06-02 | 中兴通讯股份有限公司 | Extended-time reset circuit of switching power supply, printed circuit board, and electronic device |
-
2019
- 2019-02-20 CN CN201920216205.1U patent/CN209265378U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271704A (en) * | 2020-11-16 | 2021-01-26 | 深圳市德兰明海科技有限公司 | Power-down protection circuit and integrated chip |
| WO2022111416A1 (en) * | 2020-11-27 | 2022-06-02 | 中兴通讯股份有限公司 | Extended-time reset circuit of switching power supply, printed circuit board, and electronic device |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
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