CN107425506A - Multiple power supplies protection circuit - Google Patents
Multiple power supplies protection circuit Download PDFInfo
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- CN107425506A CN107425506A CN201710801328.7A CN201710801328A CN107425506A CN 107425506 A CN107425506 A CN 107425506A CN 201710801328 A CN201710801328 A CN 201710801328A CN 107425506 A CN107425506 A CN 107425506A
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- circuit
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- power supply
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of multiple power supplies protection circuit, including overvoltage/undervoltage detection circuit, control circuit and on-off circuit；Overvoltage/undervoltage detects circuit, its output end connects control circuit, its multiple input connects the output end of each power supply chip to be detected respectively, for monitoring each power supply chip to be detected, and when any power supply chip occurs abnormal, the overvoltage/undervoltage detection control signal of circuit output first and the second control signal；Control circuit connecting valve circuit, for receiving and keeping the 3rd control signal of output according to the first control signal and the second control signal, the operating voltage superposition of each power supply chip to be detected is cut out power supply by on-off circuit according to the 3rd control signal.The present invention not only can just protect to multiple power supplies simultaneously, and reduce the cost and difficulty of exploitation；And the power supply that chip is late-class circuit that can cut off the electricity supply in time, late-class circuit is protected, improves security.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of multiple power supplies protection circuit.
Background technology
In electronic equipment of today, to meet the power demands of different electronic devices, typically can all multiple power supplies be selected to supply
Electricity, and equipment the debugging stage or using among process, often occur excessively stream, it is short-circuit phenomena such as, power supply core can be caused
Piece burns, so as to damage equipment.Therefore, it is necessary to increase protection circuit in multiple power supplies.
Existing multiplexing protective circuit scheme, typically just take the measure separately protected to each power supply.It is for example, only right
A certain voltage carries out overvoltage protection, under-voltage protection etc., not to having the power supplys of multiple different size voltages in circuit simultaneously
The ability for being monitored and protecting.So not only increase the difficulty protected to multiple supply voltage, cause global design
Complexity and cost, and potential safety hazard be present, it is impossible to chip of cutting off the electricity supply in time is powered for late-class circuit, causes failure to expand
Greatly, late-class circuit is damaged.
The content of the invention
It is an object of the invention to provide a kind of multiple power supplies protection circuit, and not only just multiple power supplies can be protected simultaneously
Shield, and reduce the cost and difficulty of exploitation；And the power supply that chip is late-class circuit that can cut off the electricity supply in time, after protection
Level circuit, improves security.
The invention provides a kind of multiple power supplies protection circuit, including overvoltage/undervoltage detection circuit, control circuit and switch
Circuit；
The overvoltage/undervoltage detects circuit, and its output end connects the control circuit, and its multiple input connects each respectively
The output end of power supply chip to be detected, for monitoring each power supply chip to be detected, and it is different in the appearance of any power supply chip
Chang Shi, the overvoltage/undervoltage detection control signal of circuit output first and the second control signal；
The control circuit, the on-off circuit is connected, for receiving the first control signal and the second control signal, and
The 3rd control signal of output is kept according to first control signal and second control signal；
The on-off circuit, its input connect the output end of each power supply chip to be detected respectively, and its control terminal connects
The control circuit is connect, for according to the 3rd control signal, the operating voltage of each power supply chip to be detected to be superimposed
Cut out power supply.
As a kind of embodiment, the overvoltage/undervoltage detects circuit, including some over-pressed detection modules, some under-voltage inspections
Survey module and monitor processing module；
Each overvoltage detection mould is fast, and its input is connected respectively the output of each power supply chip to be detected
End, its output end connect the input of the control circuit；Operating voltage for detecting each power supply chip to be detected is
The no voltage threshold higher than corresponding to, when the operating voltage is higher than corresponding voltage threshold, the corresponding overvoltage detects mould
Fast output overvoltage signal；
Each under-voltage detection module, its input are connected respectively the output of each power supply chip to be detected
End, its output end connect the input of the control circuit；Operating voltage for detecting each power supply chip to be detected is
The no voltage threshold less than corresponding to, when the operating voltage is less than corresponding voltage threshold, the corresponding under-voltage detection mould
Under-voltage signal is exported soon；
The monitor processing module, its input connect each fast and each under-voltage inspection of the overvoltage detection mould respectively
Module is surveyed, its output end connects the control circuit, described for when receiving the over-pressed signal and/or under-voltage signal
Monitor processing module exports the first control signal and the second control signal.
As a kind of embodiment, the overvoltage detection mould includes the first DC/DC converting units, the first partial pressure unit soon
And first comparator；
The first DC/DC converting units, the output end of power supply chip to be detected corresponding to the connection of its input, its is defeated
Go out the first partial pressure unit of end connection, the operating voltage for the power supply chip to be exported carries out DC/DC conversions；
First partial pressure unit, the input of the first comparator is connected, for the operating voltage after conversion to be entered
Row partial pressure, export branch pressure voltage；
The first comparator, for compared with default voltage threshold, the branch pressure voltage to be worked as into branch pressure voltage
During higher than the voltage threshold, output overvoltage signal.
As a kind of embodiment, first partial pressure unit includes resistance R1 and resistance R2；
The resistance R1, its one end connect the first DC/DC converting units, and its other end connects first ratio respectively
Compared with one end of device and the resistance R2；
The other end ground connection of the resistance R2.
As a kind of embodiment, the under-voltage detection module and monitor processing module are monitoring processor module；
The monitoring processor module, for whether detecting the operating voltage of each power supply chip to be detected less than corresponding
Voltage threshold, when the operating voltage is less than corresponding voltage threshold, the corresponding under-voltage detection mould exports under-voltage soon
Signal；And the over-pressed signal is received, and according to the over-pressed signal and/or under-voltage signal, monitor processing module output the
One control signal and the second control signal.
As a kind of embodiment, the control circuit includes first pair of anti-phase Schmitt trigger circuit, edge D is touched
Send out device circuit, logical AND gate circuit and second pair of anti-phase Schmitt trigger circuit；
The control circuit includes first pair of anti-phase Schmitt trigger circuit, edge D flip-flop circuit, logical AND gate electricity
Road and second pair of anti-phase Schmitt trigger circuit are sequentially connected；
First pair of anti-phase Schmitt trigger circuit, for receiving the second control signal, and according to the described second control
Signal processed keeps the first level signal of output；
The edge D flip-flop circuit, for receiving first control signal and first level signal, and according to
First control signal and first level signal keep output second electrical level signal；
The logical AND gate circuit, for receiving the second electrical level signal, and according to the second electrical level signal output
Three level signal；
Second pair of anti-phase Schmitt trigger circuit, for receiving the three level signal, and according to described
Three level signal exports the 3rd control signal.
As a kind of embodiment, first pair of anti-phase Schmitt trigger circuit includes the first schmidt trigger
Device, delay circuit and the second Schmidt trigger；
First Schmidt trigger, delay circuit and the second Schmidt trigger are sequentially connected.
As a kind of embodiment, the delay circuit includes diode D7, resistance R13 and electric capacity C28；
The diode D7, it is in parallel with resistance R13, its positive pole connect respectively electric capacity C28 one end and described second apply it is close
Special trigger, its negative pole connect first Schmidt trigger；
The electric capacity C28, its other end ground connection.
As a kind of embodiment, the on-off circuit include resistance R7, transistor Q2, the second partial pressure unit and
Metal-oxide-semiconductor Q1；
The resistance R7, its one end connect the control circuit, and its other end connects the ground level of the transistor Q2；
The transistor Q2, its grounded emitter, its colelctor electrode connect the first input end of second partial pressure unit；
Second partial pressure unit, its second input connect output end and the institute of each power supply chip to be detected respectively
Metal-oxide-semiconductor Q1 source class S is stated, its output end connects the grid G of the metal-oxide-semiconductor Q1；
The metal-oxide-semiconductor Q1, D is as output end for its drain.
As a kind of embodiment, second partial pressure unit includes resistance R4 and resistance R5；
The resistance R4, its one end connect the output end of each power supply chip to be detected and the metal-oxide-semiconductor Q1 respectively
Source class S, its other end connect the grid G of the metal-oxide-semiconductor Q1 and one end of the resistance R5 respectively；
The resistance R5, its other end connect the colelctor electrode of the transistor Q2.
Compared with prior art, the technical program has advantages below：
Multiple power supplies protection circuit provided by the invention, circuit and each power supply chip to be detected are detected by overvoltage/undervoltage
Output end connection, in any one power supply chip exception, overvoltage/undervoltage detection the control signal of circuit output first and second control
Signal processed；Control circuit connecting valve circuit, for receiving and keeping defeated according to the first control signal and the second control signal
Go out the 3rd control signal, on-off circuit cuts the operating voltage superposition of each power supply chip to be detected according to the 3rd control signal
Go out power supply.The present invention not only can just protect to multiple power supplies simultaneously, and reduce the cost and difficulty of exploitation；And
The chip that can cut off the electricity supply in time is the power supply of late-class circuit, protects late-class circuit, improves security.
Brief description of the drawings
Fig. 1 is the structural representation for the multiple power supplies protection circuit that the embodiment of the present invention one provides；
Fig. 2 is the structural representation of the overvoltage/undervoltage detection circuit in Fig. 1；
Fig. 3 is the structural representation of control circuit in Fig. 1；
Fig. 4 is the structural representation of on-off circuit in Fig. 1.
In figure：1st, overvoltage/undervoltage detection circuit；2nd, control circuit；21st, first pair of anti-phase Schmitt trigger circuit；22nd, side
Along d type flip flop circuit；23rd, logical AND gate circuit；24th, second pair of anti-phase Schmitt trigger circuit；3rd, on-off circuit.
Embodiment
Below in conjunction with accompanying drawing, the technical characteristic above-mentioned and other to the present invention and advantage are clearly and completely described,
Obviously, described embodiment is only the section Example of the present invention, rather than whole embodiments.
Referring to Fig. 1, the multiple power supplies protection circuit that the embodiment of the present invention one provides, including overvoltage/undervoltage detection circuit 1, control
Circuit 2 and on-off circuit 3 processed；
Overvoltage/undervoltage detects circuit 1, and its output end connection control circuit 2, its multiple input connects each to be detected respectively
Power supply chip output end, for monitoring each power supply chip to be detected, and when any power supply chip occurs abnormal, mistake
Undervoltage detection circuit 1 exports the first control signal and the second control signal；
The connecting valve circuit 3 of control circuit 2, for receiving the first control signal and the second control signal, and according to the
One control signal and the second control signal keep the 3rd control signal of output；
On-off circuit 3, its input connect the output end of each power supply chip to be detected, the connection control of its control terminal respectively
Circuit 2 processed, for according to the 3rd control signal, the operating voltage superposition of each power supply chip to be detected to be cut out into power supply.
It should be noted that each power supply chip to be detected is by whole work electricity of each power supply chip to be detected
Laminated is powered after adding to subsequent conditioning circuit, when wherein exception occurs in any one power supply chip to be detected, for example occurred
Pressure, under-voltage or short-circuit situation, overvoltage/undervoltage detection circuit 1 can detect the first control signal of feedback and the second control letter in time
Number；So that control circuit 2 keeps the 3rd control signal of output, the power supply to subsequent conditioning circuit is cut off, protects late-class circuit, prevents event
Barrier further expands.
Overvoltage/undervoltage detection circuit 1 includes multiple inputs, and its output end can be merged into the first control signal of output at one
With the second control signal；It can also be by two-way, be used to export the first control signal all the way, another way is used to export the second control
Signal processed.Control circuit 2 is according to the first control signal so that its output end reversion the 3rd control signal of output, and the second control
3rd control signal of the output that signal makes keeps level, such as, low level signal is exported after reversion, then the second control signal
So that persistently exporting low level signal, ensure power supply of the cut-out to subsequent conditioning circuit in time.
Multiple power supplies protection circuit provided by the invention, circuit 1 and each power supply core to be detected are detected by overvoltage/undervoltage
The output end connection of piece, in any one power supply chip exception, overvoltage/undervoltage detection circuit 1 exports the first control signal and second
Control signal；The connecting valve circuit 3 of control circuit 2, for receiving and being protected according to the first control signal and the second control signal
The 3rd control signal of output is held, on-off circuit 3 is according to the 3rd control signal by the operating voltage of each power supply chip to be detected
Superposition cuts out power supply.The present invention not only can just protect to multiple power supplies simultaneously, and reduce the cost and difficulty of exploitation
Degree；And the power supply that chip is late-class circuit that can cut off the electricity supply in time, late-class circuit is protected, improves security.
Each circuit part of the present invention is described in detail below：
It should be noted that overvoltage/undervoltage detection circuit 1 can include some over-pressed detection modules, some under-voltage detection modules
And monitor processing module；
Each overvoltage detection mould is fast, and its input is connected respectively the output end of each power supply chip to be detected, its
Output end connects the input of control circuit 2；For detect each power supply chip to be detected operating voltage whether higher than pair
The voltage threshold answered, when operating voltage is higher than corresponding voltage threshold, the corresponding overvoltage detection fast output overvoltage signal of mould；
Each under-voltage detection module, its input are connected respectively the output end of each power supply chip to be detected, its
Output end connects the input of control circuit 2；For detect each power supply chip to be detected operating voltage whether less than pair
The voltage threshold answered, when operating voltage is less than corresponding voltage threshold, corresponding under-voltage detection mould exports under-voltage signal soon；
Monitor processing module, its input connect each overvoltage detection mould soon with each under-voltage detection module respectively, and its is defeated
Go out end connection control circuit 2, for when receiving over-pressed signal and/or under-voltage signal, monitor processing module output first to be controlled
Signal processed and the second control signal.
Overvoltage detection mould includes the first DC/DC converting units, the first partial pressure unit and first comparator soon；First DC/
DC converting units, the output end of power supply chip to be detected, its output end connect the first partial pressure list corresponding to the connection of its input
Member, the operating voltage for power supply chip to be exported carry out DC/DC conversions；First partial pressure unit, connect the defeated of first comparator
Enter end, for the operating voltage after conversion to be carried out into partial pressure, export branch pressure voltage；First comparator, for by branch pressure voltage with
Default voltage threshold is compared, when branch pressure voltage is higher than voltage threshold, output overvoltage signal.Simple in construction, detection is anti-
Reflect quick.And the concrete composition of under-voltage detection module and above-mentioned overvoltage detection mould are consistent soon, both differences are comparing
Device by the branch pressure voltage of under-voltage detection module compared with default voltage threshold, when the branch pressure voltage of under-voltage detection module is low
When voltage threshold, under-voltage signal is exported.
First partial pressure unit includes resistance R1 and resistance R2；Resistance R1, its one end connect the first DC/DC converting units, its
The other end connects first comparator and resistance R2 one end respectively；Resistance R2 other end ground connection.Using two resistant series groups
Into according to different demands, the resistance of two resistance of change；For example resistance is respectively 15K and 3K, precision 1%, for supervising
Survey when input terminal voltage+3.3VDIS exceedes+3.6VDIS；Resistance is respectively 25K and 3K, precision 1%, for monitor input terminal
Voltage+5V exceedes+5.6V；Resistance is respectively 43K and 2K, precision 1%, exceed for monitor input terminal voltage+12V+
13.6V.First partial pressure unit is applied widely, reduces production cost.
Overvoltage/undervoltage detection circuit 1 can also include some over-pressed detection modules and monitoring processor module；Each overvoltage inspection
It is fast to survey mould, its input is connected respectively the output end of each power supply chip to be detected, the connection monitoring processing of its output end
The input of device module；Whether the operating voltage for detecting each power supply chip to be detected is higher than corresponding voltage threshold,
When operating voltage is higher than corresponding voltage threshold, the corresponding overvoltage detection fast output overvoltage signal of mould；Monitoring processor module
Including monitoring processor chip and its peripheral circuit, whether the operating voltage for detecting each power supply chip to be detected is less than
Corresponding voltage threshold, when operating voltage is less than corresponding voltage threshold, corresponding under-voltage detection mould exports under-voltage signal soon；
And over-pressed signal is received, according to over-pressed signal and/or under-voltage signal, monitor processing module exports the first control signal and the second control
Signal processed.
The overvoltage/undervoltage detection circuit 1 that detection is entered in citing to the multiple power supplies of different voltages illustrates, the voltage of independent power source
Respectively+5V ,+12V ,+3.3V ,+3.3V；The voltage for the main power source group being made up of them is 25V.
It is illustrated in figure 2 the structural representation of overvoltage/undervoltage detection circuit 1；With 4 over-pressed detection modules, the main core of use
Piece has U9, U11, U12 and U13 to be encapsulated as SC-70 for voltage comparator ADCMP350；Wherein, 1 pin is that inverting analog voltage is defeated
Enter end, 2 pin are ground connection, and 3 pin are digital open drain output, and 4 pin are power input.ADCMP350 chip internals have individual+0.6V
Reference voltage.When the input voltage of ADCMP350 1 pin end of oppisite phase is higher than inside+0.6V, 3 pin just export low level, no
Then just maintain high level.Wherein, the resistance that bleeder circuit includes resistance R14 and resistance R17, resistance R14 and resistance R17 is respectively
15K and 3K, precision 1%, once input terminal voltage+3.3V, more than 3.6V, the voltage on resistance R17 is higher than more than+0.6V
3 pin output ends will be made to export low level during ADCMP350 internal reference voltage+0.6V.Similarly, other three circuits difference
It is monitoring+12V ,+5V ,+3.3VDIS, wherein resistance R21 and resistance R22 resistance are respectively 15K and 3K, precision 1%, are used
In monitoring when input terminal voltage+3.3VDIS exceedes+3.6VDIS；Resistance R23 and resistance R24 resistance are respectively 25K and 3K, essence
Spend for 1%, exceed+5.6V for monitor input terminal voltage+5V；Resistance R19 and resistance R20 resistance are respectively 43K and 2K, essence
Spend for 1%, exceed+13.6V for monitor input terminal voltage+12V.In other embodiment, it can also use and be set in outside
Reference voltage accesses 5 pin, does not do any restriction herein.Wherein, electric capacity C25, C27, C30, C31 and C32 is 100nF/
50V is used for input supply terminal filter action.
It is that supply voltage supervision processor chips TPS3307-33DR is encapsulated as MSOP- that monitoring processor module, which includes U10,
8.Wherein the 1 of U10,2,3 pins are used to monitoring that three-way power voltage be+5V ,+3.3V ,+12V, 1, inside 2 pins to be partial pressure electric
Road, under-voltage setting value are respectively 4.55V and 2.93V, are 1.25V reference voltages inside 3 pins.5 pin are that low level is effectively multiple
Position output end and 6 pin are the effective reset output terminal of high level.7 pin are the effective hand-reset input of low level, and 8 pin are electricity
Source, 4 pin are ground connection.
Its operation principle is when four pass by supply voltage+3.3V in pressure detection module ,+3.3VDIS ,+5V, appoints in+12V
Meaning all the way by after electric resistance partial pressure more than during+0.6V reference voltages, ADCMP350 3 pin will export one inside ADCMP350
7 pin of the low level to U10In, when 7 pinFor low level when, 5 pinExport low level and the high electricity of 6 pin RST outputs
It is flat.At the same time, whenFor high level when, if any one magnitude of voltage is less than in supply voltage+3.3V ,+5V ,+12V
1 pin internal reference voltage value 4.55V, 2 pin internal reference voltage value 2.93V and pass through non-essential resistance R15 in TPS3307-33DR
Resistance is that the magnitude of voltage that 910K precision is 1% and R18 resistances are the bleeder circuit that 160K precision is 1% composition is less than inside 3 pin
During reference voltage value 1.25V, 5 pinExport low level and 6 pin RST output high level.Once+5V ,+12V ,+3.3V ,+
Any one voltage can cut off main power source above or below the threshold voltage of setting in 3.3VDIS prevents failure from further expanding
Greatly, late-class circuit is protected；So that two adjacent different magnitudes of voltage because artificial maloperation cause short circuit or because device in itself lack
Falling into, which causes short circuit also to cut off main power source, prevents failure from further expanding, and protects late-class circuit；Device used is small package (SC-
70th, SOT-23), cost is low, has strict demand to be entirely unaffected by wiring board area.
Further, control circuit 2 include first pair of anti-phase Schmitt trigger circuit 21, edge D flip-flop circuit 22,
Logical AND gate circuit 23 and second pair of anti-phase Schmitt trigger circuit 24；Control circuit 2 includes first couple of anti-phase Schmidt
Flip-flop circuit 21, edge D flip-flop circuit 22, logical AND gate circuit 23 and second pair of anti-phase Schmitt trigger circuit 24
It is sequentially connected；First pair of anti-phase Schmitt trigger circuit 21, for receiving the second control signal, and according to the second control signal
Keep the first level signal of output；Edge D flip-flop circuit 22, for receiving the first control signal and the first level signal, and
Output second electrical level signal is kept according to the first control signal and the first level signal；Logical AND gate circuit 23, for receiving the
Two level signals, and according to second electrical level signal output three level signal；Second pair of anti-phase Schmitt trigger circuit 24, use
In receiving three level signal, and the 3rd control signal is exported according to three level signal.Feed back it is sensitive, when logical AND gate circuit
23 when receiving second electrical level signal, now, no matter other two with door input whether be high level, the output of its output end is low
Level.
Further, the first pair of anti-phase Schmitt trigger circuit 21 include the first Schmidt trigger, delay circuit with
And second Schmidt trigger；First Schmidt trigger, delay circuit and the second Schmidt trigger are sequentially connected.Its
In, delay circuit includes diode D7, resistance R13 and electric capacity C28；Diode D7 is in parallel with resistance R13, and its positive pole connects respectively
Electric capacity C28 one end and the second Schmidt trigger is connect, its negative pole connects the first Schmidt trigger；Another terminations of electric capacity C28
Ground.
Control circuit 2 is described in detail for citing, is illustrated in figure 3 the structural representation of control circuit 2；Wherein,
The anti-phase Schmitt trigger circuit 21 of a pair of is double anti-phase Schmidt trigger U7 and its peripheral circuit, second couple of anti-phase Schmidt
Flip-flop circuit 24 is double anti-phase Schmidt trigger U5 and its peripheral circuit, and edge D flip-flop circuit 22 is edge D flip-flop
SN74AUP1G74DCU packaging Vs SSOP-8 and its peripheral circuit, logical AND gate circuit 23 are three input logics and door chip
SN74LVC1G11DBV encapsulates SC70-6 and its peripheral circuit.Used master chip U7, U5 is double anti-phase Schmidt triggers
SN74AUP2G14DCKR encapsulates SC70, wherein, 1 pin and 3 pin are digital level inputs, and 4 pin and 6 pin are that digital level is anti-phase
Output end, 2 pin are ground connection, and 5 pin are power end.If input is high level, reversed-phase output is just low level, otherwise output
For high level.U8 is edge D flip-flop SN74AUP1G74DCU packaging V SSOP-8, wherein, 1 pin CLK is that rising edge triggers clock
Signal input part, high level are effective；2 pin D are data input pin；3 pinFor reversed-phase output；4 pin are ground connection；5 pin Q are output
End；6 pinTo remove input, low level is effective；7 pinTo preset input, low level is effective；8 pin are power end.
U6 is that three input logics encapsulate SC70-6 with door chip SN74LVC1G11DBV.Wherein, 1 pin inputs for A ends, and 3 pin are that B ends are defeated
Enter, 6 pin input for C-terminal, and 2 pin are ground connection, and 4 pin are Y output ends, and 5 pin are power end.D7 and D8 is Schottky diode
BAT54T1G is encapsulated as SOD-123；C26 and C28 is that tantalum electric capacity 10UF/10V is encapsulated as SOD-123.Wherein resistance R16 resistances are
1K and electric capacity C29 capacitances are that 1nF/50V forms RC retardation ratio circuit；Resistance R13 resistance 100K, Schottky diode D7 are
BAT54T1G and tantalum electric capacity C28 capacitances are that 10UF/10V forms delay circuit；Resistance R12 resistances are 680K, Schottky diode
D8 is that BAT54T1G and tantalum electric capacity C26 capacitances 10UF/10V forms filter circuit.Resistance R10 values are 10K and electric capacity C21 resistances are
1NF/50V forms filter circuit.Electric capacity C19, C20, C23, C24 capacitance are that 100NF/50V acts on for power filter.
When its operation principle is starts shooting normal, it is high that U6 1 pin A from external display panel is passed to a starting-up signal ON/OFF
Level signal.Because start is all gone well, U8 6 pinInput end is removed in high level, U8 7 pinDefault input
End becomes high level by the delay circuit that R12 and C26 are formed from the low level of booting moment, U8 2 pin D data input pins with
U8 3 pinIt is connected.Now U8 1 pin CLK clock signal input terminals are in low level, U8 5 pin Q output high level.Cause
It is connected for U8 5 pin with U6 3 pin, so U6 3 pin B inputs are high level, U6 6 pin C-terminals are external display panel
Upper+3.3VDIS inputs.Now U6 4 pin Y ends output high level, by double anti-phase Schmidt triggers, U5 4 pin are high electricity
It is flat.
When having served as undervoltage detection circuit 1 and detecting that any power supply chip occurs abnormal, U10 6 pin RST output high level,
High level is also become by 1 pin CK clock signal input terminals of the delay circuit that R16 and C29 are formed to U8 by one, makes U8 5 pin
Q values invert, and become low level, while U10 5 pin by high levelAlso low level is become by original high level, it is connected
The double anti-phase Schmidt triggers of U7 pass through C28 and R13 delay circuits and U8 6 pinIt is connected.U8 6 pin are by high level
Become low level go forward side by side a step pin Q values make its output holding low level.U8 5 pin Q outputs are connected with U6 3 pin B.Now,
No matter whether other two on U6 and the pin of door input 1 and 6 pin are high level, U6 4 pin Y output ends output low level.It is logical
Double anti-phase Schmidt triggers are crossed, U5 4 pin are also low level.
The structural representation of on-off circuit 3 as shown in Figure 4；Including resistance R7, transistor Q2, the second partial pressure unit and
Metal-oxide-semiconductor Q1；Resistance R7, its one end connection control circuit 2, its other end connection transistor Q2 ground level；Transistor Q2, it is launched
Pole is grounded, and its colelctor electrode connects the first input end of the second partial pressure unit；Second partial pressure unit, its second input connect respectively
Each output end of power supply chip to be detected and metal-oxide-semiconductor Q1 source class S, its output end connection metal-oxide-semiconductor Q1 grid G；Metal-oxide-semiconductor
Q1, D is as output end for its drain.
Further, the second partial pressure unit includes resistance R4 and resistance R5；Resistance R4, its one end connect each to be checked respectively
The output end of the power supply chip of survey and metal-oxide-semiconductor Q1 source class S, its other end connect metal-oxide-semiconductor Q1 grid G and resistance R5 respectively
One end；Resistance R5, its other end connection transistor Q2 colelctor electrode.Simple in construction, reliability is high, according to different partial pressure need
Ask, can configure in time.
The above-mentioned operation principle of on-off circuit 3 is that, when all starts are normal, the ON signals for being passed to resistance R7 sides are high electricity
It is flat, open Q2 transistors NPN.The bleeder circuit that power end+24V is made up of R2 and R5, makes P-channel enhancement type metal-oxide-semiconductor Q1's
Grid G and source S produce positive pipe pressure difference, so as to turn on Q1, make circuit normal work.Conversely, then cut off circuit；Safety can
Lean on, fast response time.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention
Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (10)
1. a kind of multiple power supplies protection circuit, it is characterised in that including overvoltage/undervoltage detection circuit, control circuit and switch electricity
Road；
The overvoltage/undervoltage detects circuit, and its output end connects the control circuit, and its multiple input connects each to be checked respectively
The output end of the power supply chip of survey, for monitoring each power supply chip to be detected, and when any power supply chip occurs abnormal,
The overvoltage/undervoltage detection control signal of circuit output first and the second control signal；
The control circuit, the on-off circuit is connected, for receiving the first control signal and the second control signal, and according to institute
State the first control signal and second control signal keeps the 3rd control signal of output；
The on-off circuit, its input connect the output end of each power supply chip to be detected, its control terminal connection institute respectively
Control circuit is stated, for according to the 3rd control signal, the operating voltage superposition of each power supply chip to be detected to be cut out
Power supply.
2. multiple power supplies protection circuit as claimed in claim 1, it is characterised in that the overvoltage/undervoltage detects circuit, if including
Dry over-pressed detection module, some under-voltage detection modules and monitor processing module；
Each overvoltage detection mould is fast, and its input is connected respectively the output end of each power supply chip to be detected, its
Output end connects the input of the control circuit；Whether the operating voltage for detecting each power supply chip to be detected is higher than
Corresponding voltage threshold, when the operating voltage is higher than corresponding voltage threshold, the corresponding overvoltage detection mould exports soon
Over-pressed signal；
Each under-voltage detection module, its input are connected respectively the output end of each power supply chip to be detected, its
Output end connects the input of the control circuit；Whether the operating voltage for detecting each power supply chip to be detected is less than
Corresponding voltage threshold, when the operating voltage is less than corresponding voltage threshold, the corresponding under-voltage detection mould exports soon
Under-voltage signal；
The monitor processing module, its input connect each fast and each under-voltage detection mould of the overvoltage detection mould respectively
Block, its output end connect the control circuit, for when receiving the over-pressed signal and/or under-voltage signal, the monitoring
Processing module exports the first control signal and the second control signal.
3. multiple power supplies protection circuit as claimed in claim 2, it is characterised in that the overvoltage detection mould includes first soon
DC/DC converting units, the first partial pressure unit and first comparator；
The first DC/DC converting units, the output end of power supply chip to be detected, its output end corresponding to the connection of its input
The first partial pressure unit is connected, the operating voltage for the power supply chip to be exported carries out DC/DC conversions；
First partial pressure unit, the input of the first comparator is connected, for the operating voltage after conversion to be divided
Pressure, export branch pressure voltage；
The first comparator, for by the branch pressure voltage compared with default voltage threshold, when branch pressure voltage is higher than
During the voltage threshold, output overvoltage signal.
4. multiple power supplies protection circuit as claimed in claim 3, it is characterised in that first partial pressure unit includes resistance R1
With resistance R2；
The resistance R1, its one end connect the first DC/DC converting units, and its other end connects the first comparator respectively
With one end of the resistance R2；
The other end ground connection of the resistance R2.
5. multiple power supplies protection circuit as claimed in claim 2, it is characterised in that the under-voltage detection module and monitoring processing
Module is monitoring processor module；
The monitoring processor module, for whether detecting the operating voltage of each power supply chip to be detected less than corresponding electricity
Threshold value is pressed, when the operating voltage is less than corresponding voltage threshold, the corresponding under-voltage detection mould exports under-voltage signal soon；
And the over-pressed signal is received, and according to the over-pressed signal and/or under-voltage signal, the control of monitor processing module output first
Signal and the second control signal.
6. multiple power supplies protection circuit as claimed in claim 1, it is characterised in that the control circuit is anti-phase including first pair
Schmitt trigger circuit, edge D flip-flop circuit, logical AND gate circuit and second pair of anti-phase Schmitt trigger circuit；
The control circuit include first pair of anti-phase Schmitt trigger circuit, edge D flip-flop circuit, logical AND gate circuit with
And second pair of anti-phase Schmitt trigger circuit is sequentially connected；
First pair of anti-phase Schmitt trigger circuit, believe for receiving the second control signal, and according to the described second control
Number keep output the first level signal；
The edge D flip-flop circuit, for receiving first control signal and first level signal, and according to described
First control signal and first level signal keep output second electrical level signal；
The logical AND gate circuit, for receiving the second electrical level signal, and according to the second electrical level signal output the 3rd
Level signal；
Second pair of anti-phase Schmitt trigger circuit, for receiving the three level signal, and according to the described 3rd electricity
The flat control signal of signal output the 3rd.
7. multiple power supplies protection circuit as claimed in claim 6, it is characterised in that first pair of anti-phase Schmidt trigger
Circuit includes the first Schmidt trigger, delay circuit and the second Schmidt trigger；
First Schmidt trigger, delay circuit and the second Schmidt trigger are sequentially connected.
8. multiple power supplies protection circuit as claimed in claim 7, it is characterised in that the delay circuit include diode D7,
Resistance R13 and electric capacity C28；
The diode D7, in parallel with resistance R13, its positive pole connects electric capacity C28 one end respectively and second Schmidt touches
Device is sent out, its negative pole connects first Schmidt trigger；
The electric capacity C28, its other end ground connection.
9. multiple power supplies protection circuit as claimed in claim 1, it is characterised in that the on-off circuit includes resistance R7, crystalline substance
Body pipe Q2, the second partial pressure unit and metal-oxide-semiconductor Q1；
The resistance R7, its one end connect the control circuit, and its other end connects the ground level of the transistor Q2；
The transistor Q2, its grounded emitter, its colelctor electrode connect the first input end of second partial pressure unit；
Second partial pressure unit, its second input connect the output end of each power supply chip to be detected and described respectively
Metal-oxide-semiconductor Q1 source class S, its output end connect the grid G of the metal-oxide-semiconductor Q1；
The metal-oxide-semiconductor Q1, D is as output end for its drain.
10. multiple power supplies protection circuit as claimed in claim 9, it is characterised in that second partial pressure unit includes resistance
R4 and resistance R5；
The resistance R4, its one end connect the output end of each power supply chip to be detected and the source class of the metal-oxide-semiconductor Q1 respectively
S, its other end connect the grid G of the metal-oxide-semiconductor Q1 and one end of the resistance R5 respectively；
The resistance R5, its other end connect the colelctor electrode of the transistor Q2.
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| CN201710801328.7A CN107425506B (en) | 2017-09-07 | 2017-09-07 | Multi-path power supply protection circuit |
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| CN201710801328.7A CN107425506B (en) | 2017-09-07 | 2017-09-07 | Multi-path power supply protection circuit |
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| CN110618726A (en) * | 2019-09-25 | 2019-12-27 | 卡斯柯信号有限公司 | High-precision adjustable power supply monitoring circuit system and method |
| CN111327026A (en) * | 2020-02-27 | 2020-06-23 | 深圳市深智电科技有限公司 | Two-path direct current power supply circuit with overvoltage and undervoltage protection function and method |
| CN111431143A (en) * | 2020-04-24 | 2020-07-17 | 深圳市三旺通信股份有限公司 | Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment |
| CN111819103A (en) * | 2018-10-23 | 2020-10-23 | 深圳配天智能技术研究院有限公司 | Safety control system, control method and automobile |
| CN112054483A (en) * | 2020-08-04 | 2020-12-08 | 上海空间电源研究所 | Simple high-reliability overvoltage protection circuit |
| CN112069554A (en) * | 2020-09-18 | 2020-12-11 | 天津兆讯电子技术有限公司 | Power-on structure of external power supply, method thereof, security chip and electronic card |
| CN112115520A (en) * | 2020-09-18 | 2020-12-22 | 天津兆讯电子技术有限公司 | Internal power supply structure and method, safety chip and electronic card |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
| CN115357108A (en) * | 2022-06-30 | 2022-11-18 | 广州创龙电子科技有限公司 | AM335x discrete power supply power-on and power-off time sequence control circuit and method |
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| CN112115520A (en) * | 2020-09-18 | 2020-12-22 | 天津兆讯电子技术有限公司 | Internal power supply structure and method, safety chip and electronic card |
| CN112069554A (en) * | 2020-09-18 | 2020-12-11 | 天津兆讯电子技术有限公司 | Power-on structure of external power supply, method thereof, security chip and electronic card |
| CN112115520B (en) * | 2020-09-18 | 2024-06-07 | 天津兆讯电子技术有限公司 | Internal power supply structure and method, security chip and electronic card |
| CN112069554B (en) * | 2020-09-18 | 2024-06-11 | 天津兆讯电子技术有限公司 | External power supply power-on structure and method thereof, security chip and electronic card |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
| CN115357108A (en) * | 2022-06-30 | 2022-11-18 | 广州创龙电子科技有限公司 | AM335x discrete power supply power-on and power-off time sequence control circuit and method |
| CN117578387A (en) * | 2023-10-27 | 2024-02-20 | 深圳市安保医疗科技股份有限公司 | Control circuit of multiple input power supply and switching power supply equipment |
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