CN104135691B - MCU reset control circuits and television set - Google Patents
MCU reset control circuits and television set Download PDFInfo
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- CN104135691B CN104135691B CN201410401227.7A CN201410401227A CN104135691B CN 104135691 B CN104135691 B CN 104135691B CN 201410401227 A CN201410401227 A CN 201410401227A CN 104135691 B CN104135691 B CN 104135691B
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Abstract
The invention discloses a kind of MCU reset control circuits, MCU reset control circuits include：Monitoring modular, for receiving the input of direct current supply voltage, and fluctuated and declined according to direct current supply voltage Yes/No, it is corresponding to export effective monitoring signal/invalid monitoring signal；Anti-shaking module, allowing for receiving the input of direct current supply voltage, and according to direct current supply voltage Yes/No in voltage range, accordingly exporting effective stabilization signal/invalid stabilization signal；Voltage transformation module, it is that MCU supply voltages are exported to MCU by the voltage conversion of input, and according to effective monitoring signal and invalid stabilization signal is received, the output of MCU supply voltages is disconnected, so that MCU is resetted for receiving the input of direct current supply voltage.The invention also discloses a kind of television set.The present invention program is simply easily realized, cost is low, and the I/O mouths without taking MCU are resetted, and occupancy resource is few, and applicability is wider.
Description
Technical field
The present invention relates to resetting technique field, more particularly to MCU reset control circuits and television set.
Background technology
Television set Alternating Current Power Supply condition of instant error (such as the voltage pulsation of AC network is too big or the power line of television set with
The bad Alternating Current Power Supply exception for causing television set of AC socket contact) DC voltage of TV set power output can be caused temporarily to drop
It is low or disappear after, again it is back to normal be referred to as voltage dip.Voltage dip may cause television system enter abnormality and
Can not recover automatically, need to exchange again could recover after start normally, cause inconvenience to the user and influence the entirety of television set
Performance.
To avoid the voltage dip that Alternating Current Power Supply causes TV power supply to export extremely, at present frequently with following methods：1)
Increase special ac voltage detection circuit at capable AC end, power supply is restarted again in Alternating Current Power Supply exception, same to time control
The sequential of the various output voltages of power supply processed；This method complex designing, difficulty is big, and cost is high.2) by the house dog of TV software
Open, reset TV SKD MCU in exception；This method Software for Design complexity, stability and poor reliability.
The content of the invention
It is a primary object of the present invention to solve existing MCU to reset that control program is complicated, cost is high, stability and reliable
Property difference technical problem.
To achieve the above object, the present invention provides a kind of MCU reset control circuits, and the MCU reset control circuits include：
Monitoring modular, for receiving the input of direct current supply voltage, and fluctuated and declined according to direct current supply voltage Yes/No,
Corresponding output effective monitoring signal/invalid monitoring signal；
Anti-shaking module, allowing voltage for receiving the input of direct current supply voltage, and according to direct current supply voltage Yes/No
In the range of, accordingly export effective stabilization signal/invalid stabilization signal；
Voltage transformation module, it is MCU supply voltages by the voltage conversion of input for receiving the input of direct current supply voltage
Output disconnects the defeated of MCU supply voltages to MCU, and according to the effective monitoring signal and the invalid stabilization signal is received
Go out, so that the MCU is resetted；
The MCU reset control circuits also include DC power supply terminal, and the DC power supply terminal connects the monitoring mould respectively
The input of the input of block, the input of the anti-shaking module and the voltage transformation module, the output of the monitoring modular
End connects the first controlled end of the voltage transformation module, and the output end of the anti-shaking module connects the voltage transformation module
Second controlled end, the output end output MCU supply voltages of the voltage transformation module.
Preferably, the voltage transformation module receive the effective monitoring signal and it is described effectively stabilization signal when,
The output of MCU supply voltages is kept, so that the holding normal work of the MCU.
Preferably, the monitoring modular includes first energy-storage units, second energy-storage units, first switch unit and unidirectionally led
Logical unit, wherein：The one-way conduction unit turns on the input that input is the monitoring modular, the one-way conduction list
The conducting output end of member connects the charge-discharge end of the second energy-storage units；The charge-discharge end connection institute of the first energy-storage units
The conducting input of one-way conduction unit is stated, the triggering end of the first switch unit connects the charge and discharge of the first energy-storage units
Electric end, the first conduction terminal of the first switch unit connect the charge-discharge end of the second energy-storage units, the first switch
Second conduction terminal of unit is the output end of the monitoring modular；
The first energy-storage units are discharged when the voltage of the DC power supply terminal reduces through the DC power supply terminal；Institute
First switch unit is stated when the voltage of its triggering end is less than the voltage of its first conduction terminal, its second conduction terminal output effectively prison
Control signal.
Preferably, the one-way conduction unit includes the first diode, and the first energy-storage units include the first electric capacity, institute
Stating second energy-storage units includes the second electric capacity, and the first switch unit includes PNP type triode, and the monitoring modular also includes
First resistor, second resistance and the second diode, wherein：
The anode of first diode is the input of the monitoring modular, and the anode of first diode is also successively
The anode and first capacity earth of negative electrode, the second diode through second diode, the first resistor with it is described
Second diodes in parallel, the negative electrode of first diode is through second capacity earth；
The base stage of the PNP type triode connects the anode of second diode, the emitter stage of the PNP type triode
The negative electrode of first diode is connected, the colelctor electrode of the PNP type triode is grounded through the second resistance, the positive-negative-positive
The output end of the extremely described monitoring modular of the current collection of triode.
Preferably, the anti-shaking module includes voltage regulation unit and second switch unit, the input of first voltage regulation unit
Hold and connect the triggering of the second switch unit for the input of the anti-shaking module, the output end of first voltage regulation unit
End, the first conduction terminal ground connection of the first switch unit, the second conduction terminal of the first switch unit is the stabilization mould
The output end of block；The voltage regulation unit is described when the voltage of the DC power supply terminal drops to beyond the voltage range allowed
Voltage regulation unit ends；The second switch unit is when the voltage regulation unit ends, the second conducting of the second switch unit
End exports invalid stabilization signal.
Preferably, the voltage regulation unit includes voltage-stabiliser tube, and the second switch unit includes the first NPN type triode, institute
Stating anti-shaking module also includes 3rd resistor, and the negative electrode of the voltage-stabiliser tube is the input of the anti-shaking module, the anode of voltage-stabiliser tube
Base stage through 3rd resistor connection first NPN type triode, the grounded emitter of the first NPN type triode, first
The output end of the extremely described anti-shaking module of the current collection of NPN type triode.
Preferably, the voltage transformation module includes abnormality determination unit, the 3rd switch element and voltage conversion unit, institute
State abnormality determination unit the first signal input part be the voltage transformation module the first controlled end, the abnormality determination unit
Secondary signal input be the voltage transformation module the second controlled end, the signal output part of the abnormality determination unit connects
Connect the triggering end of the 3rd switch element, the first conduction terminal ground connection of the 3rd switch element, the 3rd switch element
The second conduction terminal connect the Enable Pin of the voltage conversion unit, the feeder ear of the voltage conversion unit is the voltage turn
The input of block is changed the mold, the output end of voltage conversion unit is the output end of the voltage transformation module；
The abnormality determination unit is when receiving effective monitoring signal and invalid stabilization signal, output abnormality signal；Institute
State the 3rd switch element to turn in the abnormality determination unit output abnormality signal, be grounded its second conduction terminal；The electricity
Pressing converting unit, the output end stopping of the voltage conversion unit is defeated in the second conduction terminal ground connection of the 3rd switch element
Go out.
Preferably, the abnormality determination unit, which includes the 4th resistance and the 3rd diode, the 3rd switch element, includes
Second NPN type triode and the voltage conversion unit include the 5th resistance and voltage conversion chip, the voltage conversion chip
Including voltage input end, voltage output end and Enable Pin；
One end of 4th resistance be the voltage transformation module the first controlled end, the other end of the 4th resistance
For the second controlled end of the voltage transformation module, the other end of the 4th resistance connects the anode of the 3rd diode,
The negative electrode of 3rd diode is the signal output part of the abnormality determination unit；
The base stage of second NPN type triode connects the negative electrode of the 3rd diode, second NPN type triode
Grounded emitter, the colelctor electrode of second NPN type triode connects one end of the 5th resistance, the 5th resistance
The other end connects the voltage input end of the voltage conversion chip；The voltage input end of the voltage conversion chip is the voltage
The input of modular converter, the colelctor electrode of second NPN type triode connects the Enable Pin of the voltage conversion chip, described
The voltage output end of voltage conversion chip is the output end of the voltage transformation module.
In addition, to achieve the above object, the present invention also provides a kind of television set, including MCU, the television set is also included such as
Upper described MCU reset control circuits.
MCU reset control circuits of the present invention, MCU is powered by monitoring module, anti-shaking module and power transfer module electric
The output of pressure is controlled, and to realize that the reset to MCU controls, scheme is simply easily realized, cost is low, without taking MCU I/O
Mouthful resetted, take that MCU resource is few, can be suitably used for the MCU of no reseting interface, applicability is wider；Specifically in direct current
Supply voltage fall fluctuation after beyond allow voltage range when, make voltage transformation module disconnect MCU supply voltages output so that
MCU is resetted, smaller in direct current supply voltage pulsation, after fluctuation without departing from allow voltage range when, do not control and resetted,
Avoid to reset and control excessively sensitive and cause to reset the situation of operation by mistake, it is more reliable and more stable.
Brief description of the drawings
Fig. 1 is the module diagram of MCU reset control circuits first embodiment of the present invention；
Fig. 2 is the module diagram of MCU reset control circuits second embodiment of the present invention；
Fig. 3 is the circuit diagram of MCU reset control circuits second embodiment of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of MCU reset control circuits, is connected with MCU (not shown).Reference picture 1, implement first
In example, the MCU reset control circuits include：Monitoring modular 10, supplied for receiving the input of direct current supply voltage, and according to direct current
The fluctuation of piezoelectric voltage Yes/No declines, corresponding to export effective monitoring signal/invalid monitoring signal；Anti-shaking module 20, for receiving direct current
The input of supply voltage, and allowing voltage range (to allow voltage range can be according to actual feelings according to direct current supply voltage Yes/No
Condition is set in anti-shaking module 20 in advance) in, accordingly export effective stabilization signal/invalid stabilization signal；Voltage transformation module 30,
For receiving the input of direct current supply voltage, the voltage conversion of input is exported to MCU for MCU supply voltages and (exported to MCU
Power supply interface), and according to effective monitoring signal and invalid stabilization signal is received, disconnect the output of MCU supply voltages so that
MCU is resetted.MCU reset control circuits also include DC power supply terminal P_VCC, and DC power supply terminal P_VCC connects monitoring respectively
The input of the input of module 10, the input of anti-shaking module 20 and voltage transformation module 30, the output end of monitoring modular 10
Connect voltage transformation module 30 the first controlled end S1, anti-shaking module 20 output end connection voltage transformation module 30 second by
Control end S2, the output end M_VCC output MCU supply voltages of voltage transformation module 30.
In the present embodiment, monitoring modular 10 monitors whether direct current supply voltage fluctuates decline (whether stablizing), works as direct current
When mains ripple declines, illustrate direct current supply spread of voltage, there is temporarily drop, now export effective monitoring signal to electricity
Press modular converter 30；When direct current supply voltage declines without fluctuation, keeps stable, monitoring modular 10 then exports invalid monitoring letter
Number；When direct current supply voltage recovers normal value, monitoring modular 10 exports invalid monitoring signal.Anti-shaking module 20 detects direct current and supplied
Piezoelectric voltage fluctuation decline after whether in the voltage range of permission, i.e., the undulating value of direct current supply voltage whether permission ripple
In dynamic scope, when after the fluctuation of direct current supply voltage declines still in the voltage range of permission, now anti-shaking module 20 is sentenced
The fluctuation for being set to direct current supply voltage is dither signal, and anti-shaking module 20 exports effective stabilization signal, control voltage modular converter
30 holding normal work output, voltage transformation module 30 still can export normal MCU supply voltages；When direct current supply electricity
Pressure fluctuation fall it is big, direct current supply voltage pulsation decline after beyond in the voltage range of permission (such as direct current supply electricity
Pressure moment drops to 0V or to fall amplitude excessive moment) when, the fluctuation for now judging direct current supply voltage is non-dithered signals, is sentenced
Fixed direct current supply magnitude of voltage now is abnormal voltage value, export invalid stabilization signal, no longer control voltage modular converter 30
Normal work output is kept, the effective monitoring signal control voltage modular converter 30 that now monitoring modular 10 exports disconnects output
MCU supply voltages；When direct current supply voltage, which returns to, allows voltage range (including direct current supply voltage normal value), stabilization mould
Block 20 exports effective stabilization signal.
The working method of the MCU reset control circuits of the present embodiment is：
1st, when direct current supply voltage is normal, monitoring modular 10 exports invalid monitoring signal, and anti-shaking module 20 exports effectively
Stabilization signal, the normal work of voltage transformation module 30 output MCU supply voltages.
2nd, when direct current supply voltage pulsation decline, but undulating value is smaller, and the direct current supply voltage after fluctuation is allowing voltage
In the range of when, monitoring modular 10 exports effective monitoring signal, but anti-shaking module 20 exports effective stabilization signal, voltage transformation module
30 are receiving effective monitoring signal and effective stabilization signal, the output of MCU supply voltages are kept, so that MCU holding is normal
Work.
3rd, when direct current supply voltage pulsation declines, and undulating value is larger (such as direct current supply voltage decline abruptly to 0V),
For direct current supply voltage after fluctuation beyond voltage range is allowed, monitoring modular 10 exports effective monitoring signal, anti-shaking module 20
Invalid stabilization signal is exported, voltage transformation module 30 is receiving effective monitoring signal and invalid stabilization signal, disconnects MCU power supplies
The output of voltage, so that MCU's reset.For by MCU supply voltages by have to without when control trigger reset MCU,
Resetted during the output for disconnecting MCU supply voltages, for triggering the MCU resetted to control sometimes by nothing by MCU supply voltages,
Resetted when direct current supply voltage returns to normal value or returns to and allows in voltage range.When direct current supply voltage pulsation
Decline after voltage range is allowed, when returning to permission voltage range (including direct current supply voltage normal value), anti-shaking module
For the 20 effective stabilization signals of output to voltage transformation module 30, voltage transformation module 30 recovers normal work output MCU supply voltages.
The MCU reset control circuits of the present embodiment, by monitoring module, anti-shaking module 20 and power transfer module to MCU
The output of supply voltage is controlled, and to realize that the reset to MCU controls, scheme is simply easily realized, cost is low, without taking
MCU I/O mouths are resetted, and take that MCU resource is few, can be suitably used for the MCU of no reseting interface, applicability is wider；Specifically
Direct current supply Voltage Drop fluctuation after beyond allow voltage range when, make voltage transformation module 30 disconnect MCU supply voltages
Output it is smaller in direct current supply voltage pulsation so that MCU is resetted, when after fluctuation without departing from voltage range is allowed, do not control
System is resetted, and avoids the situation that is excessively sensitive and causing reset operation by mistake that controls that resets, more reliable and more stable.
Further, reference picture 2, in a second embodiment, monitoring modular 10 include first energy-storage units 11, the second energy storage
Unit 12, first switch unit 13 and one-way conduction unit 14, wherein：The conducting input of one-way conduction unit 14 is monitoring mould
The input of block 10, the charge-discharge end of the conducting output end connection second energy-storage units 12 of one-way conduction unit 14；First energy storage
The conducting input of the charge-discharge end connection one-way conduction unit 14 of unit 11, the triggering end connection first of first switch unit 13
The charge-discharge end of energy-storage units 11, the charge-discharge end of the first conduction terminal connection second energy-storage units 12 of first switch unit 13,
Second conduction terminal of first switch unit 13 is the output end of monitoring modular 10；Electricity of the first energy-storage units 11 in DC power supply terminal
When pressure drop is low, discharged through DC power supply terminal；First switch unit 13 is less than the electricity of its first conduction terminal in the voltage of its triggering end
During pressure, 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 circuits is normal, DC power supply terminal
Output voltage charges to first energy-storage units 11 and second energy-storage units 12, then first energy-storage units 11 and second energy-storage units 12
Charge-discharge end voltage it is equal, the voltage of the triggering end of first switch unit 13 and the first conduction terminal is equal, first switch list
Second conduction terminal of member 13 exports invalid monitoring signal；After first energy-storage units 11 and fully charged second energy-storage units 12, directly
The voltage pulsation for flowing feeder ear output declines, then the charge-discharge end voltage of first energy-storage units 11 is higher than the electricity of DC power supply terminal
Pressure, first energy-storage units 11 be discharged to through DC power supply terminal it is equal with the voltage of DC power supply terminal, and due to second energy-storage units
There is one-way conduction unit 14, second energy-storage units 12 are without discharging, therefore DC power supply terminal between 12 and DC power supply terminal
When the voltage pulsation of output declines, the voltage of the charge-discharge end of second energy-storage units 12 is higher than the discharge and recharge of first energy-storage units 11
The voltage of first conduction terminal of the voltage at end, i.e. first switch unit 13 is higher than the voltage of its triggering end, then first switch unit
13 the second conduction terminal output effective monitoring signal.
In a second embodiment, anti-shaking module 20 includes voltage regulation unit 21 and second switch unit 22, the first voltage regulation unit
21 input is the input of anti-shaking module 20, and the output end of the first voltage regulation unit 21 connects the triggering of second switch unit 22
End, the first conduction terminal ground connection of first switch unit 13, the second conduction terminal of first switch unit 13 is the defeated of anti-shaking module 20
Go out end；When the voltage of DC power supply terminal drops to beyond the voltage range allowed, voltage regulation unit 21 ends voltage regulation unit 21；The
For two switch elements 22 when voltage regulation unit 21 ends, the second conduction terminal of second switch unit 22 exports invalid stabilization signal.
The operation principle of anti-shaking module 20 is：When direct current supply voltage, (normal voltage is allowing in permission voltage range
In voltage range) when, the voltage of the input of voltage regulation unit 21 is more than the conducting voltage of voltage regulation unit 21, and voltage regulation unit 21 is led
Logical, the output end of voltage regulation unit 21 has voltage so that second switch unit 22 is turned on, and second so as to second switch unit 22 is led
Go side connects with its first conduction terminal (ground connection), i.e., the second conduction terminal of second switch unit 22 exports effective stabilization signal；When
When direct current supply voltage pulsation is dropped to beyond the voltage range allowed, the voltage of the input of voltage regulation unit 21 is less than voltage stabilizing list
The conducting voltage of member 21, voltage regulation unit 21 end, the output end no-voltage of voltage regulation unit 21 so that second switch unit 22 is cut
Only, invalid stabilization signal is exported so as to the second conduction terminal of second switch unit 22.
In a second embodiment, voltage transformation module 30 includes abnormality determination unit 31, the 3rd switch element 32 and voltage
Converting unit 33, the first signal input part of abnormality determination unit 31 are the first controlled end of voltage transformation module 30, are sentenced extremely
The secondary signal input of order member 31 be voltage transformation module 30 the second controlled end, the signal output of abnormality determination unit 31
The triggering end of the 3rd switch element 32 of end connection, the first conduction terminal ground connection of the 3rd switch element 32, the 3rd switch element 32
Second conduction terminal connects the Enable Pin of voltage conversion unit 33, and the feeder ear of voltage conversion unit 33 is voltage transformation module 30
Input, the output end of voltage conversion unit 33 are the output end M_VCC of voltage transformation module 30；Abnormality determination unit 31 is connecing
When receiving effective monitoring signal and invalid stabilization signal, output abnormality signal；3rd switch element 32 is in abnormality determination unit 31
Turned on during output abnormality signal, be grounded its second conduction terminal；Voltage conversion unit 33 is led the second of the 3rd switch element 32
When go side is grounded, the output end of voltage conversion unit 33 stops output.
The operation principle of voltage transformation module 30 is：When abnormality detecting unit receives effective stabilization signal, abnormality detection
The output end output low level of unit, the 3rd switch element 32 end, the normal work of voltage conversion unit 33 output MCU power supply electricity
Pressure；When abnormality detecting unit receives invalid stabilization signal and effective monitoring signal, the output end high level of abnormality detecting unit,
3rd switch element 32 turns on, and the Enable Pin ground connection of voltage conversion unit 33, voltage conversion unit 33 is stopped, and disconnects output
MCU supply voltages, are resetted MCU.
Further, reference picture 3, the MCU reset control circuits of the present embodiment, one-way conduction unit 14 include the one or two pole
Pipe D1, first energy-storage units 11 include the first electric capacity C1, and second energy-storage units 12 include the second electric capacity C2, first switch unit 13
Including PNP type triode Q1, monitoring modular also includes first resistor R1, second resistance R2 and the second diode D2, wherein：
First diode D1 anode is the input of monitoring modular 10, and the first diode D1 anode is also successively through second
Diode D2 negative electrode, the second diode D2 anode and the first electric capacity C1 ground connection, first resistor R1 and the second diode D2 are simultaneously
Connection, the first diode D1 negative electrode are grounded through the second electric capacity C2；First PNP type triode Q1 base stage connects the second diode D2
Anode, the first PNP type triode Q1 emitter stage connects the first diode D1 negative electrode, the first PNP type triode Q1 collection
Electrode is grounded through second resistance R2, the output end of the first PNP type triode Q1 current collection extremely monitoring modular 10.In order that it must supervise
The circuit for surveying module 10 is more stablized with reliably, and the first diode D1 passes through resistance R6 and the second electric capacity C2 and connected in the present embodiment
Connect, and a resistance R7 is serially connected with the first PNP type triode Q1 base stage.The preferred first switch unit of the present embodiment is PNP
Type triode Q1；Certainly, first switch unit 13 can also be the other kinds of switching tube for realizing identical function, or
Other realize the circuit or device of identical function.
The present embodiment MCU reset control circuits, voltage regulation unit 21 include voltage-stabiliser tube ZD, and second switch unit 22 includes first
NPN type triode Q2, anti-shaking module also include 3rd resistor R3, and voltage-stabiliser tube ZD negative electrode is the input of anti-shaking module 20, surely
Base stage of the pressure pipe ZD anode through 3rd resistor R3 the first NPN type triodes of connection Q2, the first NPN type triode Q2 emitter stage
Ground connection, the output end of the first NPN type triode Q2 current collection extremely anti-shaking module 20.The preferred second switch unit of the present embodiment is
First NPN type triode Q2；Certainly, second switch unit 22 can also be the other kinds of switching tube for realizing identical function,
Can also be the circuit or device that other realize identical function.
The present embodiment MCU reset control circuits, abnormality determination unit 31 include the 4th resistance R4 and the 3rd diode D3, the
Three switch elements 32, which include the second NPN type triode Q3 and voltage conversion unit 33, includes the 5th resistance R5 and voltage conversion chip
U1, voltage conversion chip U1 include voltage input end Vi, voltage output end Vo and Enable Pin EN；4th resistance R4 one end is electricity
The other end for pressing the first controlled end S1, the 4th resistance R4 of modular converter 30 is the second controlled end S2 of voltage transformation module 30,
The 4th resistance R4 other end is also connected with the 3rd diode D3 anode, and the 3rd diode D3 negative electrode is abnormality determination unit 31
Signal output part；Second NPN type triode Q3 base stage connects the 3rd diode D3 negative electrode, the second NPN type triode Q3
Grounded emitter, the second NPN type triode Q3 colelctor electrode connects the 5th resistance R5 one end, the 5th resistance R5 other end
Connect voltage conversion chip U1 voltage input end Vi；Voltage conversion chip U1 voltage input end Vi is voltage transformation module 30
Input；Second NPN type triode Q3 colelctor electrode connection voltage conversion chip U1 Enable Pin EN, voltage conversion chip U1
Voltage output end Vo be voltage transformation module 30 output end M_VCC.The present embodiment preferably the 3rd switch element 32 is second
PNP type triode Q3；3rd switch element 32 can also be the other kinds of switching tube for realizing identical function, or its
He realizes the circuit or device of identical function.
Reference picture 2, the operation principle of the MCU reset control circuits of the present embodiment are：
1st, when the direct current supply voltage of DC power supply terminal P_VCC outputs is (straight in describing below by taking 12V as an example for normal value
The normal value of stream supply voltage all uses 12V) when, the input of monitoring modular 10 receives 12V inputs, and 12V DC voltage is through first
Diode D1 and resistance R6 charges to the second electric capacity C2, and 12V DC voltage also charges through first resistor R1 to the first electric capacity C1, the
After one electric capacity C1 and the second electric capacity C2 charging completes, the voltage phase at the voltage at the first electric capacity C1 both ends and the second electric capacity C2 both ends
Deng, therefore the first PNP type triode Q1 base voltage and emitter voltage are equal, the first PNP type triode Q1 cut-offs, first
PNP type triode Q1 colelctor electrode (i.e. the output end of monitoring modular 10) exports invalid monitoring signal (low level).Meanwhile stabilization
The input (voltage-stabiliser tube ZD negative electrode) of module 20 receives 12V DC control source, voltage-stabiliser tube ZD conducting (voltage-stabiliser tube ZD conductings
Voltage is less than 12V, such as voltage-stabiliser tube ZD conducting voltage is 9V, it is allowed to which voltage range is 9V~12V), the first NPN type triode
Q2 base voltage is high level, and the first NPN type triode Q2 is turned on, the first NPN type triode Q2 colelctor electrode (i.e. stabilization mould
The output end of block 20) the effective stabilization signal (low level) of output.(voltage turns for 4th resistance R4 of voltage transformation module 30 one end
Change the mold block 30 the first controlled end S1) and the other end (the second controlled end S2 of voltage transformation module 30) be all low level so that
Second NPN type triode Q3 base stage is low level, and the second NPN type triode Q3 ends, voltage conversion chip U1 Enable Pin
EN is high level, and voltage conversion chip U1 work outputs MCU supplies voltage to MCU power supplies, MCU normal works.
2nd, when the direct current supply voltage pulsation decline of DC power supply terminal P_VCC outputs, but the direct current supply after declining is fluctuated
Voltage is allowing in voltage range, it is allowed to which voltage range is by taking 9V~12V as an example, it is assumed that fluctuating the direct current supply voltage after declining is
10V；The input of monitoring modular 10 receives the electricity of the input of 10V DC voltages, the first electric capacity C1 both ends and the second electric capacity C2 both ends
Press as 12V, more than 10V, the first electric capacity C1 is through the second diode D2 repid discharges to 10V, but the second electric capacity C2 is due to second
Diode D2 is reversely not turned on, so the second electric capacity C2 does not discharge, it is still 12V, the first PNP type triode Q1 emitter voltage
It is more than its base voltage 10V, the first PNP type triode Q1 conducting for 12V, the first PNP type triode Q1 colelctor electrode output has
Imitate monitoring signal (high level).The input of anti-shaking module 20 receives the input of 10V DC voltages, and 10V DC voltages are more than voltage stabilizing
Pipe ZD conducting voltage 9V, voltage-stabiliser tube ZD are turned on, and the first NPN type triode Q2 base stage is high level, the first NPN type triode
Q2 is turned on, and the first NPN type triode Q2 colelctor electrode exports effective stabilization signal (low level).The first of voltage transformation module 30
Controlled end S1 is high level, and the second controlled end S2 is low level, and the second NPN type triode Q3 base stage is low level, the 2nd NPN
Type triode Q3 ends, and voltage conversion chip U1 Enable Pin EN is high level, and voltage conversion chip U1 normal works export MCU
Supply voltage to MCU power supplies, MCU normal works.
3rd, when the direct current supply voltage pulsation decline of DC power supply terminal P_VCC outputs, but the direct current supply after declining is fluctuated
Voltage is beyond permission voltage range, it is allowed to which voltage range is by taking 9V~12V as an example, it is assumed that fluctuating the direct current supply voltage after declining is
8V；The input of monitoring modular 10 receives the voltage of the input of 8V DC voltages, the first electric capacity C1 both ends and the second electric capacity C2 both ends
For 12V, more than 8V, the first electric capacity C1 is through the second diode D2 repid discharges to 8V, but the second electric capacity C2 is due to the two or two pole
Pipe D2 is reversely not turned on, so the second electric capacity C2 does not discharge, it is still 12V, the first PNP type triode Q1 emitter voltage is
12V is more than its base voltage 8V, the first PNP type triode Q1 conducting, the first PNP type triode Q1 colelctor electrode output effectively prison
Control signal (high level).The input of anti-shaking module 20 receives the input of 8V DC voltages, and 8V DC voltages are less than voltage-stabiliser tube ZD's
Conducting voltage 9V, voltage-stabiliser tube ZD are not turned on, and the first NPN type triode Q2 base stage is low level, and the first NPN type triode Q2 is cut
Only, the first NPN type triode Q2 colelctor electrode exports invalid stabilization signal (high-impedance state).The first of voltage transformation module 30 is controlled
End S1 is high level, and the second controlled end S2 is high-impedance state, so that the second NPN type triode Q3 base stage is high level, the 2nd NPN
Type triode Q3 is turned on, and voltage conversion chip U1 Enable Pin EN be low level, and voltage conversion chip U1 no MCU that do not work power
Voltage output give MCU power supply, for by MCU supply voltages by have to without when control trigger reset MCU, answered at this moment
Position.
4th, when the direct current supply voltage pulsation of DC power supply terminal P_VCC outputs declines beyond permission voltage range 9V~12V
Afterwards, return to when allowing voltage range 9V~12V (such as 11V), the input of anti-shaking module 20 receives the defeated of 11V DC voltages
Entering, 11V is more than voltage-stabiliser tube ZD conducting voltage 9V, and voltage-stabiliser tube ZD conductings, the first NPN type triode Q2 base stage is high level,
First NPN type triode Q2 is turned on, and the first NPN type triode Q2 colelctor electrode exports effective stabilization signal (low level).It is if straight
Stream supply voltage returns to 12V, then the output end (the first PNP type triode Q1 colelctor electrode) of monitoring modular 10 is in the first electric capacity
C1 exports invalid monitoring signal (low level) after being filled to 12V, if direct current supply voltage is returned to less than 12V (such as 11V),
Monitoring modular 10 exports effective monitoring signal (high level).Second controlled end S2 of voltage transformation module 30 receives effective stabilization letter
Number (low level), the second NPN type triode Q3 base stage are low level, the second NPN type triode Q3 cut-offs, voltage conversion chip
U1 Enable Pin EN is high level, and voltage conversion chip U1 recovers normal work, and output MCU supplies voltage to MCU, and MCU recovers
Normal work, for triggering the MCU resetted to control sometimes by nothing by MCU supply voltages, resetted at this moment.
The present invention also provides a kind of television set, and the television set includes MCU and MCU reset control circuits.Reset control electricity
Road may include the technical scheme in any of the above-described embodiment, and its detailed circuit structure can refer to Fig. 1 and Fig. 3, will not be described here.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of MCU reset control circuits, it is characterised in that the MCU reset control circuits include：
Monitoring modular, for receiving the input of direct current supply voltage, and fluctuated and declined according to direct current supply voltage Yes/No, accordingly
Export effective monitoring signal/invalid monitoring signal；
Anti-shaking module, allowing voltage range for receiving the input of direct current supply voltage, and according to direct current supply voltage Yes/No
It is interior, accordingly export effective stabilization signal/invalid stabilization signal；
Voltage transformation module, for receiving the input of direct current supply voltage, the voltage conversion of input is exported for MCU supply voltages
To MCU, and according to the effective monitoring signal and the invalid stabilization signal is received, the output of MCU supply voltages is disconnected, with
Resetted the MCU；
The MCU reset control circuits also include DC power supply terminal, and the DC power supply terminal connects the monitoring modular respectively
The input of input, the input of the anti-shaking module and the voltage transformation module, the output end of the monitoring modular connect
The first controlled end of the voltage transformation module is connect, the output end of the anti-shaking module connects the second of the voltage transformation module
Controlled end, the output end output MCU supply voltages of the voltage transformation module.
2. MCU reset control circuits as claimed in claim 1, it is characterised in that the voltage transformation module is receiving
When stating effective monitoring signal and the effectively stabilization signal, the output of MCU supply voltages is kept, so that the holding of the MCU is just
Often work.
3. MCU reset control circuits as claimed in claim 1 or 2, it is characterised in that the monitoring modular includes the first energy storage
Unit, second energy-storage units, first switch unit and one-way conduction unit, wherein：The conducting input of the one-way conduction unit
Hold and connect filling for the second energy-storage units for the input of the monitoring modular, the conducting output end of the one-way conduction unit
Discharge end；The charge-discharge end of the first energy-storage units connects the conducting input of the one-way conduction unit, and described first opens
The triggering end for closing unit connects the charge-discharge end of the first energy-storage units, the first conduction terminal connection of the first switch unit
The charge-discharge end of the second energy-storage units, the second conduction terminal of the first switch unit are the output of the monitoring modular
End；
The first energy-storage units are discharged when the voltage of the DC power supply terminal reduces through the DC power supply terminal；Described
One switch element is when the voltage of its triggering end is less than the voltage of its first conduction terminal, its second conduction terminal output effective monitoring letter
Number.
4. MCU reset control circuits as claimed in claim 3, it is characterised in that the one-way conduction unit includes the one or two
Pole pipe, the first energy-storage units include the first electric capacity, and the second energy-storage units include the second electric capacity, the first switch list
Member includes PNP type triode, and the monitoring modular also includes first resistor, second resistance and the second diode, wherein：
The anode of first diode is the input of the monitoring modular, and the anode of first diode is also successively through institute
State the negative electrode of the second diode, the anode of the second diode and first capacity earth, the first resistor and described second
Diodes in parallel, the negative electrode of first diode is through second capacity earth；
The base stage of the PNP type triode connects the anode of second diode, the emitter stage connection of the PNP type triode
The negative electrode of first diode, the colelctor electrode of the PNP type triode are grounded through the second resistance, the pole of positive-negative-positive three
The output end of the extremely described monitoring modular of the current collection of pipe.
5. MCU reset control circuits as claimed in claim 1 or 2, it is characterised in that the anti-shaking module includes voltage regulation unit
With second switch unit, the input of the voltage regulation unit is the input of the anti-shaking module, the output of the voltage regulation unit
End connects the triggering end of the second switch unit, the first conduction terminal ground connection of the second switch unit, the second switch
Second conduction terminal of unit is the output end of the anti-shaking module；The voltage regulation unit declines in the voltage of the DC power supply terminal
During to voltage range beyond permission, the voltage regulation unit cut-off；The second switch unit when the voltage regulation unit ends,
Second conduction terminal of the second switch unit exports invalid stabilization signal.
6. MCU reset control circuits as claimed in claim 5, it is characterised in that the voltage regulation unit includes voltage-stabiliser tube, described
Second switch unit includes the first NPN type triode, and the anti-shaking module also includes 3rd resistor, and the negative electrode of the voltage-stabiliser tube is
The input of the anti-shaking module, the anode of voltage-stabiliser tube connect the base stage of first NPN type triode through the 3rd resistor,
The grounded emitter of first NPN type triode, the output end of the extremely described anti-shaking module of current collection of the first NPN type triode.
7. MCU reset control circuits as claimed in claim 1 or 2, it is characterised in that the voltage transformation module includes abnormal
Identifying unit, the 3rd switch element and voltage conversion unit, the first signal input part of the abnormality determination unit is the electricity
Press the first controlled end of modular converter, the secondary signal input of the abnormality determination unit is the of the voltage transformation module
Two controlled ends, the signal output part of the abnormality determination unit connect the triggering end of the 3rd switch element, and the described 3rd opens
The first conduction terminal ground connection of unit is closed, the second conduction terminal of the 3rd switch element connects the enabled of the voltage conversion unit
End, the feeder ear of the voltage conversion unit are the input of the voltage transformation module, and the output end of voltage conversion unit is
The output end of the voltage transformation module；
The abnormality determination unit is when receiving effective monitoring signal and invalid stabilization signal, output abnormality signal；Described
Three switch elements turn in the abnormality determination unit output abnormality signal, are grounded its second conduction terminal；The voltage turns
Unit is changed in the second conduction terminal ground connection of the 3rd switch element, the output end of the voltage conversion unit stops output.
8. MCU reset control circuits as claimed in claim 7, it is characterised in that the abnormality determination unit includes the 4th electricity
Resistance and the 3rd diode, the 3rd switch element, which include the second NPN type triode and the voltage conversion unit, includes the 5th
Resistance and voltage conversion chip, the voltage conversion chip include voltage input end, voltage output end and Enable Pin；
One end of 4th resistance is the first controlled end of the voltage transformation module, and the other end of the 4th resistance is institute
The second controlled end of voltage transformation module is stated, the other end of the 4th resistance connects the anode of the 3rd diode, described
The negative electrode of 3rd diode is the signal output part of the abnormality determination unit；
The base stage of second NPN type triode connects the negative electrode of the 3rd diode, the hair of second NPN type triode
Emitter grounding, the colelctor electrode of second NPN type triode connect one end of the 5th resistance, the 5th resistance it is another
End connects the voltage input end of the voltage conversion chip；The voltage input end of the voltage conversion chip is the voltage conversion
The input of module, the colelctor electrode of second NPN type triode connect the Enable Pin of the voltage conversion chip, the voltage
The voltage output end of conversion chip is the output end of the voltage transformation module.
9. a kind of television set, including MCU, it is characterised in that the television set also includes as any one of claim 1-8
MCU reset control circuits.
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| CN201410401227.7A CN104135691B (en) | 2014-08-14 | 2014-08-14 | MCU reset control circuits and television set |
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| CN201410401227.7A CN104135691B (en) | 2014-08-14 | 2014-08-14 | MCU reset control circuits and television set |
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| CN104135691B true CN104135691B (en) | 2017-12-22 |
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| CN105158671B (en) * | 2015-05-29 | 2017-12-26 | 杭州长川科技股份有限公司 | time parameter test circuit |
| CN106104994B (en) * | 2016-05-31 | 2019-05-28 | 深圳市锐明技术股份有限公司 | A kind of DC-DC power source and its low pressure switch off control circuit |
| CN106773905B (en) * | 2016-11-24 | 2019-02-05 | 中国船舶重工集团公司第七一六研究所 | A kind of disappeared based on power supply timing trembles the switching value output circuit of control |
| CN107123383B (en) * | 2017-04-19 | 2023-03-24 | 昆山龙腾光电股份有限公司 | Voltage monitoring device |
| 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 |
| CN109450425B (en) * | 2018-10-18 | 2022-09-06 | 上海海事大学 | Button anti-shake circuit |
| CN109274404B (en) * | 2018-11-16 | 2023-08-22 | 苏州中储普华电力科技有限公司 | LED module signal transmitting circuit based on power line |
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| CN104135691A (en) | 2014-11-05 |
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