CN104135691A - MCU resetting control circuit and TV set - Google Patents
MCU resetting control circuit and TV set Download PDFInfo
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- CN104135691A CN104135691A CN201410401227.7A CN201410401227A CN104135691A CN 104135691 A CN104135691 A CN 104135691A CN 201410401227 A CN201410401227 A CN 201410401227A CN 104135691 A CN104135691 A CN 104135691A
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Abstract
The invention discloses an MCU resetting control circuit. The MCU resetting control circuit comprises a monitoring module, an anti-shake module and a voltage conversion module. The monitoring module is used for receiving the input of the voltage of direct current supply and correspondingly outputting a valid monitoring signal/an invalid monitoring signal according to the situation whether the voltage of the direct current supply is reduced in a fluctuation mode or not. The anti-shake module is used for receiving the input of the voltage of the direct current supply and correspondingly outputting a valid anti-shake signal/an invalid anti-shake signal according to the situation whether the voltage of the direct current supply is in the allowed voltage range or not. The voltage conversion module is used for receiving the input of the voltage of the direct current supply, converting the input voltage into MCU supply voltage, outputting the MCU supply voltage to an MCU, and disconnecting the outputting of the MCU supply voltage according to the received valid monitor signal and the invalid anti-shake signal to enable the MCU to reset. The invention further discloses a TV set. According to the MCU resetting control circuit, the scheme is simple and easy to achieve, cost is low, resetting can be carried out without occupying an I/O port of the MCU, the occupied resource is small, and the application range is wider.
Description
Technical field
The present invention relates to resetting technique field, relate in particular to MCU reset control circuit and television set.
Background technology
The Alternating Current Power Supply condition of instant error of television set (voltage fluctuation of for example AC network power line too large or television set contact the bad Alternating Current Power Supply of television set that causes with AC socket abnormal) can cause the direct voltage of TV set power output temporary transient reduce or disappear rear, reply is normally referred to as voltage dip again.Voltage dip may cause television system to enter abnormality and could recover overall performance normal, that cause inconvenience to the user and affect television set after can not automatically recovering, need exchange again start.
For avoiding Alternating Current Power Supply extremely to cause the voltage dip of TV power supply output, often adopt at present following methods: 1) exchanging end at power supply increases special ac voltage detection circuit, in the time that Alternating Current Power Supply is abnormal, power supply is restarted again, control the sequential of the various output voltages of power supply simultaneously; This method design is complicated, and difficulty is large, and cost is high.2) house dog of TV software is opened, when abnormal, make TV SKD MCU reset; This method Software for Design complexity, stability and poor reliability.
Summary of the invention
Main purpose of the present invention is to solve that existing MCU reset control program complexity, cost are high, the technical problem of stability and poor reliability.
For achieving the above object, the invention provides a kind of MCU reset control circuit, described MCU reset control circuit comprises:
Monitoring modular, for receiving the input of direct current supply voltage, and fluctuation declines according to direct current supply voltage Yes/No, corresponding output effective monitoring signal/invalid pilot signal;
Anti-shake module, for receiving the input of direct current supply voltage, and according to direct current supply voltage Yes/No allowing in voltage range, the effective anti-shake signal of corresponding output/invalid anti-shake signal;
Voltage transformation module, for receiving the input of direct current supply voltage, be that MCU supply power voltage exports MCU to by the voltage transitions of input, and according to receiving described effective monitoring signal and described invalid anti-shake signal, disconnect the output of MCU supply power voltage, so that described MCU resets;
Described MCU reset control circuit also comprises DC power supply terminal, described DC power supply terminal connects respectively the input of the input of described monitoring modular, described anti-shake module and the input of described voltage transformation module, the output of described monitoring modular connects the first controlled end of described voltage transformation module, the output of described anti-shake module connects the second controlled end of described voltage transformation module, the output output MCU supply power voltage of described voltage transformation module.
Preferably, described voltage transformation module, in the time receiving described effective monitoring signal and described effective anti-shake signal, keeps the output of MCU supply power voltage, so that the maintenance of described MCU is normally worked.
Preferably, described monitoring modular comprises the first energy-storage units, the second energy-storage units, the first switch element and one-way conduction unit, wherein: the input that the conducting input of described one-way conduction unit is described monitoring modular, the conducting output of described one-way conduction unit connects the charge-discharge end of described the second energy-storage units; The charge-discharge end of described the first energy-storage units connects the conducting input of described one-way conduction unit, the trigger end of described the first switch element connects the charge-discharge end of described the first energy-storage units, the first conduction terminal of described the first switch element connects the charge-discharge end of described the second energy-storage units, the output that the second conduction terminal of described the first switch element is described monitoring modular;
Described the first energy-storage units is in the time of the lower voltage of described DC power supply terminal, through described DC power supply terminal electric discharge; Described the first switch element is at the voltage of its trigger end during lower than the voltage of its first conduction terminal, its second conduction terminal output effective monitoring signal.
Preferably, described one-way conduction unit comprises the first diode, described the first energy-storage units comprises the first electric capacity, described the second energy-storage units comprises the second electric capacity, described the first switch element comprises positive-negative-positive triode, described monitoring modular also comprises the first resistance, the second resistance and the second diode, wherein:
The anode of described the first diode is the input of described monitoring modular, the anode of described the first diode is also successively through the negative electrode of described the second diode, anode and described first capacity earth of the second diode, described the first resistance and described the second diodes in parallel, the negative electrode of described the first diode is through described the second capacity earth;
The base stage of described positive-negative-positive triode connects the anode of described the second diode, the emitter of described positive-negative-positive triode connects the negative electrode of described the first diode, the collector electrode of described positive-negative-positive triode is through described the second grounding through resistance, the output of the very described monitoring modular of the current collection of described positive-negative-positive triode.
Preferably, described anti-shake module comprises voltage regulation unit and second switch unit, the input of described the first voltage regulation unit is the input of described anti-shake module, the output of described the first voltage regulation unit connects the trigger end of described second switch unit, the first conduction terminal ground connection of described the first switch element, the output that the second conduction terminal of described the first switch element is described anti-shake module; Described voltage regulation unit at the voltage drop of described DC power supply terminal when exceeding the voltage range of permission, described voltage regulation unit cut-off; Described second switch unit is in the time of described voltage regulation unit cut-off, and the second conduction terminal of described second switch unit is exported invalid anti-shake signal.
Preferably, described voltage regulation unit comprises voltage-stabiliser tube, described second switch unit comprises a NPN type triode, described anti-shake module also comprises the 3rd resistance, the negative electrode of described voltage-stabiliser tube is the input of described anti-shake module, the anode of voltage-stabiliser tube connects the base stage of a described NPN type triode, the grounded emitter of a NPN type triode, the output of the very described anti-shake module of current collection of a NPN type triode through described the 3rd resistance.
Preferably, described voltage transformation module comprises abnormality juding unit, the 3rd switch element and voltage conversion unit, the first controlled end that the first signal input of described abnormality juding unit is described voltage transformation module, the second controlled end that the secondary signal input of described abnormality juding unit is described voltage transformation module, the signal output part of described abnormality juding unit connects the trigger end of described the 3rd switch element, the first conduction terminal ground connection of described the 3rd switch element, the second conduction terminal of described the 3rd switch element connects the Enable Pin of described voltage conversion unit, the feeder ear of described voltage conversion unit is the input of described voltage transformation module, the output of voltage conversion unit is the output of described voltage transformation module,
Described abnormality juding unit in the time receiving effective monitoring signal and invalid anti-shake signal, output abnormality signal; The conducting in the time of described abnormality juding unit output abnormality signal of described the 3rd switch element, makes its second conduction terminal ground connection; Described voltage conversion unit is in the time of the second conduction terminal ground connection of described the 3rd switch element, and the output of described voltage conversion unit stops output.
Preferably, described abnormality juding unit comprises that the 4th resistance and the 3rd diode, described the 3rd switch element comprise that the 2nd NPN type triode and described voltage conversion unit comprise the 5th resistance and voltage transitions chip, and described voltage transitions chip comprises voltage input end, voltage output end and Enable Pin;
One end of described the 4th resistance is the first controlled end of described voltage transformation module, the other end of described the 4th resistance is the second controlled end of described voltage transformation module, the other end of described the 4th resistance connects the anode of described the 3rd diode, and the negative electrode of described the 3rd diode is the signal output part of described abnormality juding unit;
The base stage of described the 2nd NPN type triode connects the negative electrode of described the 3rd diode, the grounded emitter of described the 2nd NPN type triode, the collector electrode of described the 2nd NPN type triode connects one end of described the 5th resistance, and the other end of described the 5th resistance connects the voltage input end of described voltage transitions chip; The voltage input end of described voltage transitions chip is the input of described voltage transformation module, the collector electrode of described the 2nd NPN type triode connects the Enable Pin of described voltage transitions chip, the output that the voltage output end of described voltage transitions chip is described voltage transformation module.
In addition, for achieving the above object, the present invention also provides a kind of television set, comprises MCU, and described television set also comprises MCU reset control circuit as above.
MCU reset control circuit of the present invention, by monitoring module, anti-shake module and power transfer module, the output of MCU supply power voltage is controlled, to realize the reset control to MCU, scheme is simple and easy to realize, cost is low, reset without the I/O mouth that takies MCU, the resource that takies MCU is few, can be applicable to not have the MCU of reseting interface, and applicability is wider; Concrete exceeds while allowing voltage range after direct current supply voltage falls fluctuation, make voltage transformation module disconnect the output of MCU supply power voltage, so that MCU resets, less in direct current supply voltage fluctuation, after fluctuation, do not exceed while allowing voltage range, do not control and reset, having avoided reset to control too sensitive and having caused the situation of reset operation by mistake, more reliable and more stable.
Brief description of the drawings
Fig. 1 is the module diagram of MCU reset control circuit the first embodiment of the present invention;
Fig. 2 is the module diagram of MCU reset control circuit the second embodiment of the present invention;
Fig. 3 is the circuit diagram of MCU reset control circuit the second embodiment of the present invention.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of MCU reset control circuit, be connected with MCU (not shown).With reference to Fig. 1, in the first embodiment, this MCU reset control circuit comprises: monitoring modular 10, and for receiving the input of direct current supply voltage, and fluctuation declines according to direct current supply voltage Yes/No, corresponding output effective monitoring signal/invalid pilot signal; Anti-shake module 20, for receiving the input of direct current supply voltage, and allowing in voltage range (allowing voltage range to set in advance according to actual conditions) the effective anti-shake signal of corresponding output/invalid anti-shake signal according to direct current supply voltage Yes/No in anti-shake module 20; Voltage transformation module 30, for receiving the input of direct current supply voltage, be that MCU supply power voltage exports MCU (exporting the power supply interface of MCU to) to by the voltage transitions of input, and according to receiving effective monitoring signal and invalid anti-shake signal, disconnect the output of MCU supply power voltage, so that MCU resets.MCU reset control circuit also comprises DC power supply terminal P_VCC, DC power supply terminal P_VCC connects respectively input, the input of anti-shake module 20 and the input of voltage transformation module 30 of monitoring modular 10, the output of monitoring modular 10 connects the first controlled end S1 of voltage transformation module 30, the output of anti-shake module 20 connects the second controlled end S2 of voltage transformation module 30, the output M_VCC output MCU supply power voltage of voltage transformation module 30.
In the present embodiment, monitoring modular 10 is monitored the decline (whether stable) of whether fluctuating of direct current supply voltage, in the time that direct current supply voltage fluctuation declines, direct current supply spread of voltage is described, have and fall temporarily generation, now export effective monitoring signal to voltage transformation module 30; When the ripple disable of direct current supply voltage declines, while keeping stablizing, 10 invalid pilot signals of output of monitoring modular; In the time that direct current supply voltage recovers normal value, monitoring modular 10 is exported invalid pilot signal.After the fluctuation that anti-shake module 20 detects direct current supply voltage declines whether in the voltage range allowing, be whether the undulating value of direct current supply voltage is in the fluctuation range allowing, still in the voltage range allowing after the fluctuation of direct current supply voltage declines time, now to be judged to be the fluctuation of direct current supply voltage be dither signal to anti-shake module 20, anti-shake module 20 is exported effective anti-shake signal, control the maintenance of voltage transformation module 30 output of normally working, voltage transformation module 30 still can be exported normal MCU supply power voltage; When direct current supply voltage fluctuation fall large, for example, direct current supply voltage fluctuation has exceeded in the voltage range allowing (it is excessive that direct current supply voltage decline abruptly to 0V or moment fallen amplitude) after declining time, the fluctuation of now judging direct current supply voltage is non-dither signal, judge that direct current supply magnitude of voltage is now abnormal voltage value, export invalid anti-shake signal, the maintenance of no longer controlling voltage transformation module 30 output of normally working, the effective monitoring signal controlling voltage transformation module 30 that now monitoring modular 10 is exported disconnects output MCU supply power voltages; In the time that direct current supply voltage returns to permission voltage range (comprising direct current supply voltage normal value), anti-shake module 20 is exported effective anti-shake signal.
The working method of the MCU reset control circuit of the present embodiment is:
1, in the time that direct current supply voltage is normal, monitoring modular 10 is exported invalid pilot signal, and anti-shake module 20 is exported effective anti-shake signal, the normal work output of voltage transformation module 30 MCU supply power voltage.
2, when direct current supply voltage fluctuation declines, but undulating value is less, direct current supply voltage after fluctuation is in the time allowing in voltage range, monitoring modular 10 is exported effective monitoring signal, but anti-shake module 20 is exported effective anti-shake signal, voltage transformation module 30 is receiving effective monitoring signal and effective anti-shake signal, keeps the output of MCU supply power voltage, so that the maintenance of MCU is normally worked.
3, when direct current supply voltage fluctuation declines, and undulating value is large (for example direct current supply voltage decline abruptly is to 0V), direct current supply voltage after fluctuation has exceeded permission voltage range, monitoring modular 10 is exported effective monitoring signal, anti-shake module 20 is exported invalid anti-shake signal, voltage transformation module 30 is receiving effective monitoring signal and invalid anti-shake signal, disconnects the output of MCU supply power voltage, so that the resetting of MCU.For by MCU supply power voltage by have to without time control trigger reset MCU, in the time disconnecting the output of MCU supply power voltage, reset, for triggering to sometimes controlling the MCU resetting by nothing by MCU supply power voltage, in the time that direct current supply voltage returns to normal value or return in permission voltage range, reset.When declining to exceeding, direct current supply voltage fluctuation allows after voltage range, return to while allowing voltage range (comprising direct current supply voltage normal value), anti-shake module 20 is exported effective anti-shake signal to voltage transformation module 30, and voltage transformation module 30 recovers normal work output MCU supply power voltage.
The MCU reset control circuit of the present embodiment, by monitoring module, anti-shake module 20 and power transfer module, the output of MCU supply power voltage is controlled, to realize the reset control to MCU, scheme is simple and easy to realize, cost is low, reset without the I/O mouth that takies MCU, the resource that takies MCU is few, can be applicable to not have the MCU of reseting interface, and applicability is wider; Concrete exceeds while allowing voltage range after direct current supply voltage falls fluctuation, make voltage transformation module 30 disconnect the output of MCU supply power voltage, so that MCU resets, less in direct current supply voltage fluctuation, after fluctuation, do not exceed while allowing voltage range, do not control and reset, having avoided reset to control too sensitive and having caused the situation of reset operation by mistake, more reliable and more stable.
Further, with reference to Fig. 2, in a second embodiment, monitoring modular 10 comprises the first energy-storage units 11, the second energy-storage units 12, the first switch element 13 and one-way conduction unit 14, wherein: the conducting input of one-way conduction unit 14 is the input of monitoring modular 10, and the conducting output of one-way conduction unit 14 connects the charge-discharge end of the second energy-storage units 12; The charge-discharge end of the first energy-storage units 11 connects the conducting input of one-way conduction unit 14, the trigger end of the first switch element 13 connects the charge-discharge end of the first energy-storage units 11, the first conduction terminal of the first switch element 13 connects the charge-discharge end of the second energy-storage units 12, and the second conduction terminal of the first switch element 13 is the output of monitoring modular 10; The first energy-storage units 11, in the time of the lower voltage of DC power supply terminal, discharges through DC power supply terminal; The first switch element 13 is at the voltage of its trigger end during lower than the voltage of its first conduction terminal, its second conduction terminal output effective monitoring signal.
The operation principle of monitoring modular 10 is: when the direct current supply voltage of MCU reset control circuit is normal, DC power supply terminal output voltage charges to the first energy-storage units 11 and the second energy-storage units 12, the voltage of the charge-discharge end of the first energy-storage units 11 and the second energy-storage units 12 equates, the voltage of the trigger end of the first switch element 13 and the first conduction terminal is equal, and the second conduction terminal of the first switch element 13 is exported invalid pilot signal, when the first energy-storage units 11 and the second energy-storage units 12 are full of after electricity, the voltage fluctuation of DC power supply terminal output declines, the charge-discharge end voltage of the first energy-storage units 11 is higher than the voltage of DC power supply terminal, the first energy-storage units 11 is discharged to the voltage of DC power supply terminal and equates through DC power supply terminal, and owing to thering is one-way conduction unit 14 between the second energy-storage units 12 and DC power supply terminal, the second energy-storage units 12 does not discharge, therefore when the voltage fluctuation of DC power supply terminal output declines, the voltage of the charge-discharge end of the second energy-storage units 12 is higher than the voltage of the charge-discharge end of the first energy-storage units 11, the voltage of the first conduction terminal of the first switch element 13 is higher than the voltage of its trigger end, the second conduction terminal output effective monitoring signal of the first switch element 13.
In a second embodiment, anti-shake module 20 comprises voltage regulation unit 21 and second switch unit 22, the input of the first voltage regulation unit 21 is the input of anti-shake module 20, the output of the first voltage regulation unit 21 connects the trigger end of second switch unit 22, the first conduction terminal ground connection of the first switch element 13, the second conduction terminal of the first switch element 13 is the output of anti-shake module 20; Voltage regulation unit 21 is at the voltage drop of DC power supply terminal when exceeding the voltage range of permission, and voltage regulation unit 21 ends; Second switch unit 22 is in the time that voltage regulation unit 21 ends, and the second conduction terminal of second switch unit 22 is exported invalid anti-shake signal.
The operation principle of anti-shake module 20 is: in the time that direct current supply voltage is allowing in voltage range (normal voltage is allowing in voltage range), the voltage of the input of voltage regulation unit 21 is greater than the conducting voltage of voltage regulation unit 21, voltage regulation unit 21 conductings, the output of voltage regulation unit 21 has voltage, make 22 conductings of second switch unit, thereby the second conduction terminal of second switch unit 22 is communicated with its first conduction terminal (ground connection), i.e. the effective anti-shake signal of the second conduction terminal output of second switch unit 22; In the time that direct current supply voltage fluctuation drops to the voltage range that exceeds permission, the voltage of the input of voltage regulation unit 21 is less than the conducting voltage of voltage regulation unit 21, voltage regulation unit 21 ends, the output no-voltage of voltage regulation unit 21, second switch unit 22 is ended, thus the invalid anti-shake signal of the second conduction terminal output of second switch unit 22.
In a second embodiment, voltage transformation module 30 comprises abnormality juding unit 31, the 3rd switch element 32 and voltage conversion unit 33, the first signal input of abnormality juding unit 31 is the first controlled end of voltage transformation module 30, the secondary signal input of abnormality juding unit 31 is the second controlled end of voltage transformation module 30, the signal output part of abnormality juding unit 31 connects the trigger end of the 3rd switch element 32, the first conduction terminal ground connection of the 3rd switch element 32, the second conduction terminal of the 3rd switch element 32 connects the Enable Pin of voltage conversion unit 33, the feeder ear of voltage conversion unit 33 is the input of voltage transformation module 30, the output of voltage conversion unit 33 is the output M_VCC of voltage transformation module 30, abnormality juding unit 31 in the time receiving effective monitoring signal and invalid anti-shake signal, output abnormality signal, the conducting in the time of abnormality juding unit 31 output abnormality signal of the 3rd switch element 32, makes its second conduction terminal ground connection, voltage conversion unit 33 is in the time of the second conduction terminal ground connection of the 3rd switch element 32, and the output of voltage conversion unit 33 stops output.
The operation principle of voltage transformation module 30 is: when abnormality detection unit receives effective anti-shake signal, and the output output low level of abnormality detection unit, the 3rd switch element 32 ends, the normal work output of voltage conversion unit 33 MCU supply power voltage; When abnormality detection unit receives invalid anti-shake signal and effective monitoring signal, the output high level of abnormality detection unit, the 3rd switch element 32 conductings, the Enable Pin ground connection of voltage conversion unit 33, voltage conversion unit 33 quits work, and disconnects output MCU supply power voltage, and MCU is resetted.
Further, with reference to Fig. 3, the MCU reset control circuit of the present embodiment, one-way conduction unit 14 comprises the first diode D1, the first energy-storage units 11 comprises that the first capacitor C 1, the second energy-storage units 12 comprises that the second capacitor C 2, the first switch elements 13 comprise positive-negative-positive triode Q1, monitoring modular also comprises the first resistance R 1, the second resistance R 2 and the second diode D2, wherein:
The anode of the first diode D1 is the input of monitoring modular 10, the anode of the first diode D1 is also successively through the negative electrode of the second diode D2, anode and the first capacitor C 1 ground connection of the second diode D2, the first resistance R 1 is in parallel with the second diode D2, and the negative electrode of the first diode D1 is through the second capacitor C 2 ground connection; The base stage of the first positive-negative-positive triode Q1 connects the anode of the second diode D2, the emitter of the first positive-negative-positive triode Q1 connects the negative electrode of the first diode D1, the collector electrode of the first positive-negative-positive triode Q1 is through the second resistance R 2 ground connection, the very output of monitoring modular 10 of the current collection of the first positive-negative-positive triode Q1.In order to make the circuit of monitoring modular 10 more stable and reliable, in the present embodiment, the first diode D1 is connected with the second capacitor C 2 by resistance R 6, and is serially connected with a resistance R 7 in the base stage of the first positive-negative-positive triode Q1.The present embodiment preferably the first switch element is positive-negative-positive triode Q1; Certainly, the first switch element 13 can also be the switching tube of realizing identical function of other types, also can realize for other circuit or device of identical function.
The present embodiment MCU reset control circuit, voltage regulation unit 21 comprises voltage-stabiliser tube ZD, second switch unit 22 comprises a NPN type triode Q2, anti-shake module also comprises the 3rd resistance R 3, the negative electrode of voltage-stabiliser tube ZD is the input of anti-shake module 20, the anode of voltage-stabiliser tube ZD connects the base stage of a NPN type triode Q2, the grounded emitter of a NPN type triode Q2, the output of the very anti-shake module 20 of current collection of a NPN type triode Q2 through the 3rd resistance R 3.The preferred second switch of the present embodiment unit is a NPN type triode Q2; Certainly, second switch unit 22 can also be the switching tube of realizing identical function of other types, also can realize for other circuit or device of identical function.
The present embodiment MCU reset control circuit, abnormality juding unit 31 comprises that the 4th resistance R 4 and the 3rd diode D3, the 3rd switch element 32 comprise that the 2nd NPN type triode Q3 and voltage conversion unit 33 comprise the 5th resistance R 5 and voltage transitions chip U1, and voltage transitions chip U1 comprises voltage input end Vi, voltage output end Vo and Enable Pin EN; One end of the 4th resistance R 4 is the first controlled end S1 of voltage transformation module 30, the other end of the 4th resistance R 4 is the second controlled end S2 of voltage transformation module 30, the other end of the 4th resistance R 4 also connects the anode of the 3rd diode D3, and the negative electrode of the 3rd diode D3 is the signal output part of abnormality juding unit 31; The base stage of the 2nd NPN type triode Q3 connects the negative electrode of the 3rd diode D3, the grounded emitter of the 2nd NPN type triode Q3, the collector electrode of the 2nd NPN type triode Q3 connects one end of the 5th resistance R 5, and the other end of the 5th resistance R 5 connects the voltage input end Vi of voltage transitions chip U1; The voltage input end Vi of voltage transitions chip U1 is the input of voltage transformation module 30; The collector electrode of the 2nd NPN type triode Q3 connects the Enable Pin EN of voltage transitions chip U1, and the voltage output end Vo of voltage transitions chip U1 is the output M_VCC of voltage transformation module 30.The present embodiment preferably the 3rd switch element 32 is the second positive-negative-positive triode Q3; The 3rd switch element 32 can also be the switching tube of realizing identical function of other types, also can realize for other circuit or device of identical function.
With reference to Fig. 2, the operation principle of the MCU reset control circuit of the present embodiment is:
1, when the direct current supply voltage of DC power supply terminal P_VCC output is that normal value is (taking 12V as example, in below describing, the normal value of direct current supply voltage is all used 12V) time, the input of monitoring modular 10 receives 12V input, 12V direct voltage charges to the second capacitor C 2 through the first diode D1 and resistance R 6, 12V direct voltage also charges to the first capacitor C 1 through the first resistance R 1, after the first capacitor C 1 and the second capacitor C 2 have been charged, the voltage at the voltage at the first capacitor C 1 two ends and the second capacitor C 2 two ends equates, therefore the base voltage of the first positive-negative-positive triode Q1 and emitter voltage equate, the first positive-negative-positive triode Q1 cut-off, the collector electrode (being the output of monitoring modular 10) of the first positive-negative-positive triode Q1 is exported invalid pilot signal (low level).Simultaneously, the input (negative electrode of voltage-stabiliser tube ZD) of anti-shake module 20 receives the input of 12V direct voltage, (conducting voltage of voltage-stabiliser tube ZD is less than 12V in voltage-stabiliser tube ZD conducting, the for example conducting voltage of voltage-stabiliser tube ZD is 9V, permission voltage range is 9V～12V), the base voltage of the one NPN type triode Q2 is high level, the one NPN type triode Q2 conducting, the collector electrode (being the output of anti-shake module 20) of a NPN type triode Q2 is exported effective anti-shake signal (low level).One end (the first controlled end S1 of voltage transformation module 30) and the other end (the second controlled end S2 of voltage transformation module 30) of the 4th resistance R 4 of voltage transformation module 30 are all low level, thereby the base stage of the 2nd NPN type triode Q3 is low level, the 2nd NPN type triode Q3 cut-off, the Enable Pin EN of voltage transitions chip U1 is high level, voltage transitions chip U1 work output MCU supply power voltage is powered to MCU, and MCU normally works.
2, when the direct current supply voltage fluctuation of DC power supply terminal P_VCC output declines, but the direct current supply voltage fluctuating after declining is allowing in voltage range, allows voltage range taking 9V～12V as example, supposes that the direct current supply voltage after fluctuation decline is 10V; The input of monitoring modular 10 receives the input of 10V direct voltage, the voltage at the first capacitor C 1 two ends and the second capacitor C 2 two ends is 12V, be greater than 10V, the first capacitor C 1 through the second diode D2 repid discharge to 10V, but the second capacitor C 2 is due to the second oppositely not conducting of diode D2, so the second capacitor C 2 is not discharged, be still 12V, the emitter voltage of the first positive-negative-positive triode Q1 is that 12V is greater than its base voltage 10V, the first positive-negative-positive triode Q1 conducting, the collector electrode output effective monitoring signal (high level) of the first positive-negative-positive triode Q1.The input of anti-shake module 20 receives the input of 10V direct voltage, 10V direct voltage is greater than the conducting voltage 9V of voltage-stabiliser tube ZD, voltage-stabiliser tube ZD conducting, the base stage of the one NPN type triode Q2 is high level, the one NPN type triode Q2 conducting, the collector electrode effective anti-shake signal of output (low level) of a NPN type triode Q2.The first controlled end S1 of voltage transformation module 30 is high level, the second controlled end S2 is low level, the base stage of the 2nd NPN type triode Q3 is low level, the 2nd NPN type triode Q3 cut-off, the Enable Pin EN of voltage transitions chip U1 is high level, the voltage transitions chip U1 output MCU supply power voltage of normally working is powered to MCU, and MCU normally works.
3, when the direct current supply voltage fluctuation of DC power supply terminal P_VCC output declines, but the direct current supply voltage fluctuating after declining exceeds permission voltage range, allows voltage range taking 9V～12V as example, supposes that the direct current supply voltage after fluctuation declines is 8V; The input of monitoring modular 10 receives the input of 8V direct voltage, the voltage at the first capacitor C 1 two ends and the second capacitor C 2 two ends is 12V, be greater than 8V, the first capacitor C 1 through the second diode D2 repid discharge to 8V, but the second capacitor C 2 is due to the second oppositely not conducting of diode D2, so the second capacitor C 2 is not discharged, be still 12V, the emitter voltage of the first positive-negative-positive triode Q1 is that 12V is greater than its base voltage 8V, the first positive-negative-positive triode Q1 conducting, the collector electrode output effective monitoring signal (high level) of the first positive-negative-positive triode Q1.The input of anti-shake module 20 receives the input of 8V direct voltage, 8V direct voltage is less than the conducting voltage 9V of voltage-stabiliser tube ZD, not conducting of voltage-stabiliser tube ZD, the base stage of the one NPN type triode Q2 is low level, the one NPN type triode Q2 cut-off, the collector electrode invalid anti-shake signal of output (high-impedance state) of a NPN type triode Q2.The first controlled end S1 of voltage transformation module 30 is high level, the second controlled end S2 is high-impedance state, thereby the base stage of the 2nd NPN type triode Q3 is high level, the 2nd NPN type triode Q3 conducting, the Enable Pin EN of voltage transitions chip U1 is low level, voltage transitions chip U1 does not work and exports to MCU power supply without MCU supply power voltage, for by MCU supply power voltage by have to without time control and trigger the MCU resetting, reset at this moment.
4, when declining to exceeding, the direct current supply voltage fluctuation of DC power supply terminal P_VCC output allows after voltage range 9V～12V, for example return to, while allowing voltage range 9V～12V (11V), the input of anti-shake module 20 receives the input of 11V direct voltage, 11V is greater than the conducting voltage 9V of voltage-stabiliser tube ZD, voltage-stabiliser tube ZD conducting, the base stage of the one NPN type triode Q2 is high level, the one NPN type triode Q2 conducting, the collector electrode effective anti-shake signal of output (low level) of a NPN type triode Q2.If direct current supply voltage returns to 12V, the output of monitoring modular 10 (collector electrode of the first positive-negative-positive triode Q1) is exported invalid pilot signal (low level) after the first capacitor C 1 is filled to 12V, be less than 12V (such as 11V) if direct current supply voltage returns to, monitoring modular 10 is exported effective monitoring signal (high level).The second controlled end S2 of voltage transformation module 30 receives effective anti-shake signal (low level), the base stage of the 2nd NPN type triode Q3 is low level, the 2nd NPN type triode Q3 cut-off, the Enable Pin EN of voltage transitions chip U1 is high level, voltage transitions chip U1 recovers normal work, and output MCU supply power voltage is to MCU, and MCU recovers normal work, for triggering to control sometimes the MCU resetting by nothing by MCU supply power voltage, reset at this moment.
The present invention also provides a kind of television set, and this television set comprises MCU and MCU reset control circuit.This reset control circuit can comprise the technical scheme in above-mentioned arbitrary embodiment, and its detailed circuit structure can, with reference to Fig. 1 and Fig. 3, not repeat at this.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. a MCU reset control circuit, is characterized in that, described MCU reset control circuit comprises:
Monitoring modular, for receiving the input of direct current supply voltage, and fluctuation declines according to direct current supply voltage Yes/No, corresponding output effective monitoring signal/invalid pilot signal;
Anti-shake module, for receiving the input of direct current supply voltage, and according to direct current supply voltage Yes/No allowing in voltage range, the effective anti-shake signal of corresponding output/invalid anti-shake signal;
Voltage transformation module, for receiving the input of direct current supply voltage, be that MCU supply power voltage exports MCU to by the voltage transitions of input, and according to receiving described effective monitoring signal and described invalid anti-shake signal, disconnect the output of MCU supply power voltage, so that described MCU resets;
Described MCU reset control circuit also comprises DC power supply terminal, described DC power supply terminal connects respectively the input of the input of described monitoring modular, described anti-shake module and the input of described voltage transformation module, the output of described monitoring modular connects the first controlled end of described voltage transformation module, the output of described anti-shake module connects the second controlled end of described voltage transformation module, the output output MCU supply power voltage of described voltage transformation module.
2. MCU reset control circuit as claimed in claim 1, is characterized in that, described voltage transformation module, in the time receiving described effective monitoring signal and described effective anti-shake signal, keeps the output of MCU supply power voltage, so that the maintenance of described MCU is normally worked.
3. MCU reset control circuit as claimed in claim 1 or 2, it is characterized in that, described monitoring modular comprises the first energy-storage units, the second energy-storage units, the first switch element and one-way conduction unit, wherein: the input that the conducting input of described one-way conduction unit is described monitoring modular, the conducting output of described one-way conduction unit connects the charge-discharge end of described the second energy-storage units; The charge-discharge end of described the first energy-storage units connects the conducting input of described one-way conduction unit, the trigger end of described the first switch element connects the charge-discharge end of described the first energy-storage units, the first conduction terminal of described the first switch element connects the charge-discharge end of described the second energy-storage units, the output that the second conduction terminal of described the first switch element is described monitoring modular;
Described the first energy-storage units is in the time of the lower voltage of described DC power supply terminal, through described DC power supply terminal electric discharge; Described the first switch element is at the voltage of its trigger end during lower than the voltage of its first conduction terminal, its second conduction terminal output effective monitoring signal.
4. MCU reset control circuit as claimed in claim 3, it is characterized in that, described one-way conduction unit comprises the first diode, described the first energy-storage units comprises the first electric capacity, described the second energy-storage units comprises the second electric capacity, described the first switch element comprises positive-negative-positive triode, and described monitoring modular also comprises the first resistance, the second resistance and the second diode, wherein:
The anode of described the first diode is the input of described monitoring modular, the anode of described the first diode is also successively through the negative electrode of described the second diode, anode and described first capacity earth of the second diode, described the first resistance and described the second diodes in parallel, the negative electrode of described the first diode is through described the second capacity earth;
The base stage of described positive-negative-positive triode connects the anode of described the second diode, the emitter of described positive-negative-positive triode connects the negative electrode of described the first diode, the collector electrode of described positive-negative-positive triode is through described the second grounding through resistance, the output of the very described monitoring modular of the current collection of described positive-negative-positive triode.
5. MCU reset control circuit as claimed in claim 1 or 2, it is characterized in that, described anti-shake module comprises voltage regulation unit and second switch unit, the input of described the first voltage regulation unit is the input of described anti-shake module, the output of described the first voltage regulation unit connects the trigger end of described second switch unit, the first conduction terminal ground connection of described the first switch element, the output that the second conduction terminal of described the first switch element is described anti-shake module; Described voltage regulation unit at the voltage drop of described DC power supply terminal when exceeding the voltage range of permission, described voltage regulation unit cut-off; Described second switch unit is in the time of described voltage regulation unit cut-off, and the second conduction terminal of described second switch unit is exported invalid anti-shake signal.
6. the MCU reset control circuit of stating as claim 5, it is characterized in that, described voltage regulation unit comprises voltage-stabiliser tube, described second switch unit comprises a NPN type triode, described anti-shake module also comprises the 3rd resistance, the negative electrode of described voltage-stabiliser tube is the input of described anti-shake module, the anode of voltage-stabiliser tube connects the base stage of a described NPN type triode through described the 3rd resistance, the grounded emitter of the one NPN type triode, the output of the very described anti-shake module of current collection of a NPN type triode.
7. MCU reset control circuit as claimed in claim 1 or 2, it is characterized in that, described voltage transformation module comprises abnormality juding unit, the 3rd switch element and voltage conversion unit, the first controlled end that the first signal input of described abnormality juding unit is described voltage transformation module, the second controlled end that the secondary signal input of described abnormality juding unit is described voltage transformation module, the signal output part of described abnormality juding unit connects the trigger end of described the 3rd switch element, the first conduction terminal ground connection of described the 3rd switch element, the second conduction terminal of described the 3rd switch element connects the Enable Pin of described voltage conversion unit, the feeder ear of described voltage conversion unit is the input of described voltage transformation module, the output of voltage conversion unit is the output of described voltage transformation module,
Described abnormality juding unit in the time receiving effective monitoring signal and invalid anti-shake signal, output abnormality signal; The conducting in the time of described abnormality juding unit output abnormality signal of described the 3rd switch element, makes its second conduction terminal ground connection; Described voltage conversion unit is in the time of the second conduction terminal ground connection of described the 3rd switch element, and the output of described voltage conversion unit stops output.
8. MCU reset control circuit as claimed in claim 7, it is characterized in that, described abnormality juding unit comprises that the 4th resistance and the 3rd diode, described the 3rd switch element comprise that the 2nd NPN type triode and described voltage conversion unit comprise the 5th resistance and voltage transitions chip, and described voltage transitions chip comprises voltage input end, voltage output end and Enable Pin;
One end of described the 4th resistance is the first controlled end of described voltage transformation module, the other end of described the 4th resistance is the second controlled end of described voltage transformation module, the other end of described the 4th resistance connects the anode of described the 3rd diode, and the negative electrode of described the 3rd diode is the signal output part of described abnormality juding unit;
The base stage of described the 2nd NPN type triode connects the negative electrode of described the 3rd diode, the grounded emitter of described the 2nd NPN type triode, the collector electrode of described the 2nd NPN type triode connects one end of described the 5th resistance, and the other end of described the 5th resistance connects the voltage input end of described voltage transitions chip; The voltage input end of described voltage transitions chip is the input of described voltage transformation module, the collector electrode of described the 2nd NPN type triode connects the Enable Pin of described voltage transitions chip, the output that the voltage output end of described voltage transitions chip is described voltage transformation module.
9. a television set, comprises MCU, it is characterized in that, described television set also comprises the MCU reset control circuit as described in any one in claim 1-8.
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| CN106773905A (en) * | 2016-11-24 | 2017-05-31 | 中国船舶重工集团公司第七六研究所 | A kind of being disappeared based on power supply sequential trembles the switching value output circuit of control |
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| WO2020077976A1 (en) * | 2018-10-15 | 2020-04-23 | 青岛海信电器股份有限公司 | Oled display device, oled television, and power supplying method therefor |
| CN111048036A (en) * | 2018-10-15 | 2020-04-21 | 青岛海信电器股份有限公司 | OLED display device |
| CN109450425A (en) * | 2018-10-18 | 2019-03-08 | 上海海事大学 | A kind of key Anti-shaking circuit |
| CN109450425B (en) * | 2018-10-18 | 2022-09-06 | 上海海事大学 | Button anti-shake circuit |
| CN109274404A (en) * | 2018-11-16 | 2019-01-25 | 苏州中储普华电力科技有限公司 | LED module signal sending circuit based on power carrier route |
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Effective date of registration: 20210713 Address after: Room 821, No. 333, jiufo Jianshe Road, Zhongxin Guangzhou Knowledge City, Huangpu District, Guangzhou, Guangdong 510000 Patentee after: Skyworth Group Intelligent Technology Co., Ltd Address before: No.99, Kaida Road, Guangzhou Economic and technological development science and Technology City, Guangzhou, Guangdong 510000 Patentee before: GUANGZHOU SKYWORTH FLAT DISPLAY TECHNOLOGY Co.,Ltd. |