CN108599100A - A kind of ON-OFF control circuit and load switch - Google Patents
A kind of ON-OFF control circuit and load switch Download PDFInfo
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- CN108599100A CN108599100A CN201810750728.4A CN201810750728A CN108599100A CN 108599100 A CN108599100 A CN 108599100A CN 201810750728 A CN201810750728 A CN 201810750728A CN 108599100 A CN108599100 A CN 108599100A
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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
- H02H3/22—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 of short duration, e.g. lightning
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Abstract
It includes signal input part, power voltage input terminal, first voltage control output end, the first capacitance, first switch pipe, the first current source and second switch pipe that the application, which discloses a kind of ON-OFF control circuit and load switch, the ON-OFF control circuit,；Wherein, when be the variation of its both end voltage due to the characteristic of the first capacitance, capacitance is caused to discharge or absorb charge, capacitance has the characteristic of high pass, i.e., is proportional relationship by the electric current of capacitance and capacitance both end voltage rate of change.The first end that the electric current is capacitively coupled to first switch pipe by first, namely the control terminal of second switch pipe, in this way so that being become larger by the electric current of second switch pipe, the voltage of drop-down first voltage control output end in short time, to control the main switch in load switch, and then achieve the purpose that rapidly switch off.ON-OFF control circuit circuit structure provided by the invention is simple, and does not increase more power consumption, situation that can be very fast in voltage change, carries out quick response.
Description
Technical field
The present invention relates to Analogical Circuit Technique field more particularly to a kind of ON-OFF control circuits and load switch.
Background technology
External power supply is often connected by a load switch in the equipment such as the electronic equipment of higher-end, such as mobile phone
Charger and remaining power supply unit, and the unstable of power grid, external equipment often causes the quick and big of input supply voltage
OVP (Over Voltage Protection, overvoltage protection) work(would generally be added in amplitude variation, therefore, this kind of load switch
Can, i.e., when input voltage occurs to be more than setting voltage value, load switch can close, and then protect internal circuit not by outer
Boundary's impacting with high pressure.
The shut-in time Toff of load switch is an important index, and closing velocity also means that generation is same sooner
The external overvoltage of condition, the amplitude that builtin voltage rises is smaller, also means that system is more reliable and more stable.
Multiple commercial vendors are each provided with follow-on load switch in the prior art, are switched relative to normal load, have more
Fast closing velocity, but the shut-in time of load switch in the prior art in 50ns~200ns or so, in case of 50ns
Over-voltage events in range, then the shut-in time of existing load switch is longer, and response is slower, namely load is opened in the prior art
The Toff performances of pass are bad, reduce the reliability and degree of safety of the system comprising load switch.
And the other method that can improve load switch response speed in the prior art, have power consumption larger, cost compared with
High problem.
Invention content
In view of this, a kind of ON-OFF control circuit of present invention offer and load switch, are opened with solving load in the prior art
Close when rapid overpressure event occurs, can not timely respond to, cause system reliability and degree of safety is relatively low and power consumption is larger,
The higher problem of cost.
To achieve the above object, the present invention provides the following technical solutions：
A kind of ON-OFF control circuit, is applied to load switch, and the ON-OFF control circuit includes：
Signal input part, power voltage input terminal, first voltage control output end, the first capacitance, first switch pipe, first
Current source and second switch pipe；
One end of first capacitance is connect with the signal input part；
The first of the output end and the first switch pipe of the other end of first capacitance and first current source
End is connected；
Power voltage input terminal of the input terminal of the current source as the ON-OFF control circuit, for receiving power supply electricity
The input of pressure；
The control terminal of the first switch pipe and the first end of the first switch pipe and the control of the second switch pipe
End connection processed；
The second end of the first switch pipe is connected with the second end of the second switch pipe, and is grounded；
The first end of the second switch pipe is as the first voltage control output end, for controlling the load switch
Disconnection and closure.
Preferably, further include first resistor and the second capacitance；
Wherein, one end of the first resistor is connected with the second end of the first switch pipe, the other end and the signal
Input terminal connects；
One end of second capacitance is connected with the second end of the first switch pipe, other end ground connection.
The present invention also provides a kind of load switches, including：ON-OFF control circuit, main switch and drive module；
Wherein, the ON-OFF control circuit is ON-OFF control circuit as claimed in claim 1 or 2；
The control terminal of the main switch and the drive module and the control of the first voltage of the ON-OFF control circuit are defeated
Outlet is connected, and the drive module is used to provide driving voltage for the main switch, and be turned on or off the main switch；
The first end of the main switch is connected with the signal input part of the ON-OFF control circuit；
Signal output end of the second end of the main switch as the load switch.
Preferably, the drive module includes：Second current source and Zener diode；
The input terminal of second current source is connected with the power voltage input terminal；
The output end of second current source is connected with the control terminal of the main switch；
The anode of the Zener diode is connected with the second end of the main switch；
The cathode of the Zener diode is connected with the control terminal of the main switch.
Preferably, further include overpressure treatment module；
The input terminal of the overpressure treatment module is connect with the signal input part；
The output end of the overpressure treatment module is connect with the control terminal of the main switch；
When the voltage signal pace of change of the signal input part is greater than or equal to the first predetermined threshold value, the switch control
Main switch described in circuit control processed turns off；
When the voltage signal pace of change of the signal input part is less than first predetermined threshold value, the overpressure treatment
Module controls the main switch shutdown.Preferably, ranging from 1V100ns~10V/100ns of first predetermined threshold value, packet
Include endpoint value.
Preferably, the overpressure treatment module includes：
Input voltage division module, comparison module and closedown module；
The input voltage division module includes：Input terminal, input terminal and ground terminal；
The comparison module includes first input end, the second input terminal and output end；
The closedown module includes first end, second end and control terminal；
Wherein, the input terminal of the input voltage division module is connect with the signal input part；
The output end of the input voltage division module is connected with the first input end of the comparison module；
Second input terminal of the comparison module is connected with reference voltage source, receives the input of reference voltage；
The output end of the comparison module is connected with the control terminal of the closedown module；
The first end of the closedown module is connected with the control terminal of the main switch；
The second end of the closedown module is grounded.
Preferably, the closedown module includes third switching tube；
First end of the first end of the third switching tube as the closedown module；
Second end of the second end of the third switching tube as the closedown module；
Control terminal of the control terminal of the third switching tube as the closedown module.
Preferably, the input voltage division module includes the second resistance and 3rd resistor being sequentially connected in series；
The one end of the second resistance far from the 3rd resistor is connected with the signal input part；
One end ground connection of the 3rd resistor far from the second resistance；
Output end of the common end of the second resistance and the 3rd resistor as the input voltage division module；
The comparison module includes operational amplifier；
First input end of the in-phase input end of the operational amplifier as the comparison module；
Second input terminal of the inverting input of the operational amplifier as the comparison module.
Preferably, the first switch pipe, the second switch pipe, the third switching tube are NMOS tube.
It can be seen via above technical scheme that ON-OFF control circuit provided by the invention, including：Signal input part, power supply
Voltage input end, first voltage control output end, the first capacitance, first switch pipe, the first current source and second switch pipe；Its
In, when due to the characteristic of the first capacitance being the variation of its both end voltage, cause capacitance to discharge or absorb charge, capacitance has
The characteristic of high pass is proportional relationship by the electric current of capacitance and capacitance both end voltage rate of change.The electric current of capacitance passes through
First is capacitively coupled to the control terminal of the first end of first switch pipe namely second switch pipe, so that passes through second switch
The electric current of pipe becomes larger, the voltage of drop-down first voltage control output end in the short time, to the main switch in load switch into
Row control, and then achieve the purpose that rapidly switch off.
ON-OFF control circuit provided by the invention, circuit structure is simple, and does not increase more power consumption, and can be
The very fast situation of voltage change carries out quick response.Namely in the case where power consumption increases less, improve ON-OFF control circuit
Response speed.
The present invention also provides a kind of load switch, the load switch includes that ON-OFF control circuit recited above, master open
It closes pipe and drive module, the ON-OFF control circuit is connected with the control terminal of main switch, can quickly control the main switch
The disconnection or conducting of pipe.Since the ON-OFF control circuit has the characteristics that small power consumption, fast response time, the load
The power consumption of switch is relatively low, and response speed is very fast.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of input voltage division module structural schematic diagram of the load switch provided in the prior art；
Fig. 2 is a kind of ON-OFF control circuit structural schematic diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of load switch structural schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of load switch structural schematic diagram provided in an embodiment of the present invention；
Fig. 5 is another load switch structural schematic diagram provided in an embodiment of the present invention；
Fig. 6 is another load switch structural schematic diagram provided in an embodiment of the present invention；
Fig. 7 be it is provided in an embodiment of the present invention it is a variety of in the case of response speed comparison diagram.
Specific implementation mode
Term is explained：
Vgs：The difference in voltage at grid (Gate) end and source (Source) of metal-oxide-semiconductor；
OVP：Overvoltage protection (Over Voltage Protection)；
Toff：Over-voltage events occur to start to the time between switch closing, shut-in time；
OPA：Operational amplifier (operational amplifier) are abbreviated as OP in of the invention；
BGR：Bandgap voltage reference, bandgap reference voltage are a kind of to generate one using characteristic of semiconductor
The module of normal voltage.It is formed there are many form, but its function is all to generate accurate voltage.It is abbreviated as in the present invention
BG also has and is write as BGR in article.
Just as described in the background section, the shut-in time of load switch is longer in the prior art, and response is slower, even if existing
Having in technology has the faster load switch of response, and power consumption is larger, and cost is higher.
Inventor has found that the reason of above-mentioned phenomenon occur is that the load switch with OVP functions is occurring in the prior art
When over-pressed, often take detection, compare and close three big flows, this kind of processing mode occur medium speed (50ns~
When overvoltage 200ns), often there is preferable treatment effect, but when rapid overpressure event (being less than 50ns) occurs for input terminal
When, it is limited by detection, compares, close the three zones module response speed of itself so that the shut-in time can not further decrease,
So that there is high pressure in load switch output end.
A kind of load switch is provided in the prior art, and as shown in FIG. 1, FIG. 1 is a kind of loads provided in the prior art to open
The input voltage division module structural schematic diagram of pass；The input voltage division module includes partial pressure unit 01 and selecting switch list
Member the 02, first capacitance C01, the second capacitance C02 and third capacitance C03.By increasing on the basis of traditional partial pressure unit
One capacitance, the second capacitance are accessed as feed-forward capacitance in input voltage division module, to promote the defeated of input voltage division module
Go out the climbing speed of voltage external input voltage, and then realizes the purpose for the response time for reducing input voltage division module.Though
Structure shown in right Fig. 1 efficiently solves the response time of input voltage measurement caused by electric resistance partial pressure, accelerates detection module
Response, but be the failure to improve comparison module and closedown module response, reply more quickly input over-voltage events when
Response time is still limited by the response time of two modules of comparison module and closedown module, to occur in rapid overpressure event
When, the shut-in time of load switch is longer, and response is slower.
Inventor has found that closedown module is usually metal-oxide-semiconductor, since the manufacture craft of current metal-oxide-semiconductor limits, response speed
The current limit is had reached, and comparison module generally includes operational amplifier, it, can be with by promoting the power consumption of operational amplifier
Further promote the response speed of operational amplifier；But usually operation is carried out as cost using larger power consumption and higher cost and put
The promotion of big device response speed.This, which results in load switch, has cost higher, the larger problem of power consumption.
Based on this, the present invention provides a kind of ON-OFF control circuit, is applied to load switch, the ON-OFF control circuit packet
It includes：
Signal input part, power voltage input terminal, first voltage control output end, the first capacitance, first switch pipe, first
Current source and second switch pipe；
One end of first capacitance is connect with the signal input part；
The first of the output end and the first switch pipe of the other end of first capacitance and first current source
End is connected；
Power voltage input terminal of the input terminal of the current source as the ON-OFF control circuit, for receiving power supply electricity
The input of pressure；
The control terminal of the first switch pipe and the first end of the first switch pipe and the control of the second switch pipe
End connection processed；
The second end of the first switch pipe is connected with the second end of the second switch pipe, and is grounded；
The first end of the second switch pipe is as the first voltage control output end, for controlling the load switch
Disconnection and closure.
ON-OFF control circuit provided by the invention, including：Signal input part, power voltage input terminal, first voltage control
Output end, the first capacitance, first switch pipe, the first current source and second switch pipe；Wherein, since the characteristic of the first capacitance is it
When both end voltage changes, capacitance is caused to discharge or absorb charge, capacitance has the characteristic of high pass, that is, passes through the electricity of capacitance
Stream is proportional relationship with capacitance both end voltage rate of change.Electric current on capacitance is capacitively coupled to first switch pipe by first
First end namely second switch pipe control terminal, so that become larger by the electric current of second switch pipe, drop-down in the short time
The voltage of first voltage control output end to controlling the main switch in load switch, and then reaches and rapidly switches off
Purpose.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 2 is referred to, Fig. 2 is a kind of ON-OFF control circuit structural schematic diagram provided in an embodiment of the present invention；The switch
Control circuit is applied to load switch, and the ON-OFF control circuit 10 includes：Signal input part Vin, power voltage input terminal
Vcc, first voltage control output end Vout ', the first capacitance C1, first switch pipe M1, the first current source IB1 and second switch pipe
M2；One end of first capacitance C1 is connect with signal input part Vin；The other end of first capacitance C1 is defeated with the first current source IB1's
Outlet and the first end of first switch pipe M1 are connected；Supply voltage of the input terminal of current source IB1 as ON-OFF control circuit
Input terminal Vcc, the input for receiving power source voltage Vcc；The control terminal of first switch pipe M1 and the first of first switch pipe M1
The connection of the control terminal of end and second switch pipe M2；The second end phase of the second end of first switch pipe M1 and second switch pipe M2
Even, it and is grounded；The first end of second switch pipe M2 is as first voltage control output end Vout ', for controlling load switch
It disconnects and is closed.
Specifically, in the present embodiment, if the voltage change of signal input part Vin is more slow, the first capacitance C1 is generated
Charge can be absorbed by first switch pipe M1, absorb charge can be supplemented by the first current source IB1；If but signal is defeated
Enter to hold the voltage change of Vin too fast, then the charge that the first capacitance is generated in node VC1 can not be inhaled by first switch pipe M1 in time
It receives or the charge of the first capacitance C1 absorptions, the first current source IB1 is supplemented not in time, in this way according to capacitance characteristic, signal input
When the voltage change speed at end is more than the processing speed of the first current source IB1 and first switch pipe M1, the voltage of node VC1 just has
Variation identical with the voltage change direction of signal input part, and the pace of change of node VC1 and amplitude and signal input part
Voltage change speed and amplitude positive correlation.
And since the second end of first switch pipe M1 is grounded, this has resulted in Vgs (grid and the source electrode of first switch pipe M1
Voltage difference) moment improves, will be under first voltage control output end so that increased by the electric current of second switch pipe M2
It draws, and then the main switch for controlling load switch disconnects.
The concrete type of first switch pipe M1 and second switch pipe M2, optionally, first switch are not limited in the present embodiment
Pipe M1 and second switch pipe M2 can be PMOS tube, can also be NMOS tube, in the present embodiment optionally, first switch pipe M1 and
Second switch pipe M2 is NMOS tube.
ON-OFF control circuit provided by the invention, due to the characteristic of the first capacitance be its both end voltage variation when, draw
It plays capacitance release or absorbs charge, capacitance has the characteristic of high pass, i.e., is changed by the electric current of capacitance and capacitance both end voltage
Rate is proportional relationship.The first end namely second that electric current on capacitance is capacitively coupled to first switch pipe by first are opened
Close the control terminal of pipe, so that become larger by the electric current of second switch pipe, drop-down first voltage control output end in the short time
Voltage, to controlling the main switch in load switch, and then achieve the purpose that rapidly switch off.
The embodiment of the present invention also provides a kind of load switch, refers to Fig. 3, and Fig. 3 is one kind provided in an embodiment of the present invention
Load switch structural schematic diagram；The load switch includes：ON-OFF control circuit 10, main switch 20 and drive module 30,
In, the ON-OFF control circuit 10 is the ON-OFF control circuit described in above example.
The concrete structure of main switch 20 is not limited in the present embodiment, optionally, main switch 20 is most in the present embodiment
Simple construction of switch, such as NMOS tube M0, in other embodiments of the invention, the main switch 20 can also be that other are opened
Structure is closed, this is not limited in the present embodiment.
The first voltage control output end Vout ' of the control terminal and drive module and ON-OFF control circuit 10 of main switch M0
It is connected, drive module 30 is used to provide driving voltage for main switch M0, and be turned on or off main switch；The of main switch M0
One end is connected with the signal input part Vin of ON-OFF control circuit 10；Signal of the second end of main switch M0 as load switch
Output end vo ut.
The concrete structure of drive module is not limited in the present embodiment, optionally, drive module includes：Second current source IB2
With Zener diode (Zener Diode)；The input terminal of second current source IB2 is connected with power voltage input terminal Vcc；Second electricity
The output end of stream source IB2 is connected with the control terminal of main switch M0；The second end of the anode and main switch M0 of Zener Diode
It is connected；The cathode of Zener Diode is connected with the control terminal of main switch M0.
As described in above example, the operation principle of load switch is in the present embodiment：When the electricity of signal input part Vin
When buckling speed, the first capacitance C1 conducting of ON-OFF control circuit 10, when the voltage rapid increase of node VC1, due to
Node VC2 can not rapid increase, therefore the Vgs moments for having resulted in first switch pipe M1 improve so that being opened by second
The electric current for closing pipe M2 increases, and the control terminal voltage of main switch M0 is pulled down, and then disconnects main switch so that signal input part
The faster signal of voltage change of Vin can not be transmitted to signal output end Vout.
In the present embodiment, by adjusting the capacitance of the first capacitance C1, the response speed of ON-OFF control circuit can determine.It lifts
Example explanation, will make the first capacitance C1 not handled under 1V/100ns input signal rate of changes.(1V/ is allowed in this way
100ns) * C1=IB2-IB1.Under namely such input rate of change, the first capacitance C1 releases or the charge absorbed can
To be absorbed and be discharged by the first current source IB1.After the first current source IB1 and IB2 is determined, increase the appearance of the first capacitance C1
Being worth, then ON-OFF control circuit can handle the input signal (it handles the speed range bigger of signal) of more slow rate variation,
When practical application, (1V/100ns) * C1=IB2-IB1 can be generally allowed, then reduce the capacitance of the first capacitance C1, degree depends on
In practically necessary response time requirement.Namely the capacitance by adjusting the first capacitance C1, it can adjust in the present embodiment and open
Close the response speed of control circuit.
The embodiment of the present invention also provides a kind of load switch, refers to Fig. 4, and Fig. 4 is one kind provided in an embodiment of the present invention
Load switch structural schematic diagram；On the basis of load switch of the load switch described in a upper embodiment, further include：At overvoltage
Manage module 40.
As shown in figure 4, the input terminal of overpressure treatment module 40 is connect with signal input part Vin；
The output end of overpressure treatment module 40 is connect with the control terminal of main switch M0；
When the voltage signal pace of change of signal input part Vin is greater than or equal to the first predetermined threshold value, switch control electricity
Road 10 controls main switch shutdown；
When the voltage signal pace of change of signal input part Vin is less than the first predetermined threshold value, overpressure treatment module 40 controls
Main switch turns off.
The specific range of first predetermined threshold value is not limited in the present embodiment, it can be according in actual conditions, at overvoltage
The response speed of reason module is configured.Optionally, the most fast variation of the voltage change that overpressure treatment module 40 can be handled
Speed is set as first predetermined threshold value.Then according to the size of the first predetermined threshold value, in configuration switch control circuit
The value of one capacitance C1.Optionally, ranging from 1V/100ns to the 10V/100ns of first predetermined threshold value, including endpoint value.This
First predetermined threshold value described in embodiment can be adjusted according to actual demand, and a certain monodrome is not limited in the present embodiment.
The concrete structure of overpressure treatment module 40 is not limited in the present embodiment；Optionally, as shown in figure 5, overpressure treatment mould
Block 40 includes：Input voltage division module 41, comparison module 42 and closedown module 43；Input voltage division module 41 includes：It is defeated
Enter end, input terminal and ground terminal；Comparison module 42 includes first input end, the second input terminal and output end；Closedown module 43 is wrapped
Include first end, second end and control terminal.
Wherein, the input terminal of input voltage division module 41 is connect with signal input part Vin；Input voltage division module 41
Output end be connected with the first input end of comparison module；Second input terminal of comparison module 42 is connected with reference voltage source BG,
Receive the input of reference voltage；The output end of comparison module 42 is connected with the control terminal of closedown module；The first of closedown module 43
End is connected with the control terminal of main switch M0；The second end of closedown module 43 is grounded.
The concrete structure in input voltage division module 41, comparison module 42 and closedown module 43 is not done in the present embodiment
Limit, as shown in fig. 6, optionally, in the present embodiment input voltage division module 41 include the second resistance R2 being sequentially connected in series and
3rd resistor R3；The one end of second resistance R2 far from 3rd resistor R3 is connected with signal input part Vin；3rd resistor R3 is far from
One end of two resistance R2 is grounded；Output of the common end of second resistance R2 and 3rd resistor R3 as input voltage division module 41
End.
It should be noted that input voltage division module 41 can also include other structures in the present embodiment, such as institute in Fig. 1
Capacitance C01, capacitance C02 and the capacitance C03 shown, to improve the response speed of input voltage division module 41.
Closedown module 43 includes third switching tube M3 in the present embodiment；The first end of third switching tube M3 is as closedown module
42 first end；Second end of the second end of third switching tube M3 as closedown module 42；The control terminal of third switching tube M3 is made
For the control terminal of closedown module 42.Likewise, the concrete structure in closedown module 43, closedown module 43 are not limited in the present embodiment
In can also according to actual demand, increase setting other structures, this is not repeated in this implementation.
Comparison module 42 is optional in the present embodiment, including operational amplifier OP1；The homophase input of operational amplifier OP1
The first input end at end+as comparison module 43；The inverting input-of operational amplifier OP1 as comparison module 43 second
Input terminal.
Can also include charge pump, the electricity optionally it should be noted that in order to improve the voltage value of supply voltage
Lotus pump positioned at the first current source IB1 and the second current source IB2 input terminal, to for load switch the first current source IB1 and
Second current source IB2 provides larger voltage.It is optional in the present embodiment in the case where power source voltage Vcc is larger, it can not also
Including charge pump.
It should be noted that load switch includes ON-OFF control circuit 10 and overpressure treatment module 40 in the present embodiment,
Middle ON-OFF control circuit 10 and overpressure treatment module 40 can control the voltage of the grid of main switch M0, be opened to control master
Close the disconnection and conducting of pipe M0.
As shown in fig. 6, ON-OFF control circuit 10 is configured to the subsystem of processing rapid overpressure event in the embodiment of the present invention
System；And overpressure treatment module 40 constitutes the subsystem of the over-voltage events function of low velocity in capable of handling.Specifically, the second electricity
Resistance R2,3rd resistor R3, operational amplifier OP1 and reference voltage source BG and third switching tube M3 constitute traditional overpressure treatment mould
Block；First capacitance C1, the first current source IB1, first switch pipe M1, second switch pipe M2 constitute quick processing subsystem --- it opens
Close control circuit.The conventional Vgs generation circuits of second current source IB2 and Zener Diode compositions.
It should be noted that the middle low velocity over-voltage events described in the present embodiment are relatively general with rapid overpressure event
It reads, and is qualitative description, the middle low velocity over-voltage events and the response that rapid overpressure event is relative to overpressure treatment module
For speed, due to the response of overpressure treatment mould input voltage division module, operational amplifier and third switching tube in the block
Speed is limited, can not handle the too fast signal of voltage change, then determine the voltage change signal that overpressure treatment module can be handled
Justice is middle low velocity over-voltage events；The voltage change signal that overpressure treatment resume module does not come is defined as rapid overpressure thing by youngster
Part.
For example, the voltage of signal input part is determined as overvoltage more than 6V, then signal from the case where being normally less than 6V (as just
Signal input is DC voltage 5V when normal operating voltage), risen with 1V/100ns ranks, such operational amplifier can be
Response comes in 100ns, main switch M0 is closed in time, to ensure that the voltage of signal output end does not occur excessively high pulse.Then
Voltage change speed is that 1V/100ns may be defined as middle low speed over-voltage events；If the voltage of signal input part is from normal work
Too fast, such as 10V/100ns is rushed on voltage 5V, then input signal has just had reached 15V in 100ns, during this operation put
Big device and third switching tube M0 can not timely processing, also result in signal output end high voltage overshoot occur.Then voltage change
Speed is that 10V/100ns may be defined as rapid overpressure event.When operational amplifier and third switching tube M3 can not timely processings
When, and ON-OFF control circuit can timely processing, disconnect main switch M0 in time so that the amplitude rushed on signal output end voltage
Reduce.
By the size of the first capacitance C1 in regulating switch control circuit in the present embodiment, the sound of rapid overpressure event is adjusted
Speed is answered, including：
Determine the response speed of operational amplifier OP1 and third switching tube M3.Such as they can handle 1V/100ns speed
The signal input of rate variation；
The first capacitance C1 is so made not handled under 1V/100ns input signal rate of changes.(1V/ is allowed in this way
100ns) * C1=IB2-IB1.Under namely such input rate of change, the first capacitance C1 releases or the charge absorbed can
To be absorbed and be discharged by the first current source IB1；
So in fact, after the first current source IB1 is determined, increase the capacitance of the first capacitance C1, then ON-OFF control circuit
It can handle the input signal speed range bigger of signal (its handle) of more slow rate variation, when practical application, general meeting
It allows (1V/100ns) * C1=IB2-IB1, then reduces the capacitance of the first capacitance C1, degree depends on practically necessary sound
Answer time requirement.
Optionally, the middle low velocity over-voltage events can be over-voltage events of the response speed in 50ns-200ns；Soon
Fast over-voltage events are over-voltage events of the response speed in 50ns.
The specific works of the load switch provided in the present embodiment are provided by taking load switch structure shown in Fig. 7 as an example
Principle：
In the present embodiment after signal input part input voltage signal, overpressure treatment module 40 can be entered simultaneously and switch is controlled
Circuit 10 processed, only when signal voltage variation is too fast, the processing speed of overpressure treatment module 40 is not caught up with, Wu Faji
When handle, shutdown main switch M0 is mainly carried out by ON-OFF control circuit 10 at this time.But when input signal variation is slow, due to
The capacitance characteristic of first capacitance, voltage change could comparatively fast be connected, therefore, ON-OFF control circuit 10 will not be to signal at
Reason.That is, ON-OFF control circuit 10 can only handle fast signal variation, and overpressure treatment module 40 can handle conventional speeds variation
Input signal.
That is, 1) when low velocity over-voltage events in generation, then there is the input voltage division module in entire block diagram, compares
It is responsible for detecting and executing compared with three modules of module and closedown module disconnecting main switch M0, the processing procedure of middle low speed is with higher
Precision, can or medium speed slowly varying in input voltage remain open precision when changing.
2) when input voltage rises rapidly, the not main consideration of precision of disconnection ensures output port
The lower voltage overshoot the better, is responsible for processing by ON-OFF control circuit at this time, and the first capacitance C1, the first current source IB1 and first are opened
It closes pipe M1 and quickly detects input voltage mutation, second switch pipe M2 closes rapidly main switch M0.
Refer to Fig. 7, Fig. 7 be it is provided in an embodiment of the present invention it is a variety of in the case of response speed comparison diagram；Such as Fig. 7 institutes
Show, abscissa is over-voltage events speed, and ordinate is response speed.Specifically, as shown in fig. 7, it is smaller in over-voltage events speed
When namely signal input part voltage change more slowly in the case of, the response speed of overpressure treatment module is very fast, and opens
The response speed for closing control circuit is relatively low；When over-voltage events speed is larger namely signal input part voltage change is very fast
In the case of, the response speed of overpressure treatment module is relatively low, and the response speed of ON-OFF control circuit is higher；When load switch is same
When have ON-OFF control circuit and overpressure treatment module when, then when over-voltage events speed is smaller, mainly by overpressure treatment module
Response processing is carried out, when over-voltage events speed is larger, response processing is mainly carried out by ON-OFF control circuit, resultant effect is such as
Shown in dotted line in Fig. 7.
It should be noted that the main distinction of ON-OFF control circuit and overpressure treatment module is in the present embodiment：At overvoltage
Managing the variation of module centering low speed input voltage has preferable processing capacity, can keep degree of precision.ON-OFF control circuit can answer
To quickly inputting variation.The two combination, which ensure that, can comparatively fast disconnect main switch M0 under different situations.
Namely the load switch provided in the present embodiment, including ON-OFF control circuit and overpressure treatment module, it can combine
High-precision control and ON-OFF control circuit of the overpressure treatment module in middle low speed over-voltage events are in rapid overpressure event
Quick response feature so that load switch has faster response speed.
And since the circuit structure of ON-OFF control circuit is simple, more power consumption can't be increased, it realizes as possible not
In the case of increasing power consumption, the purpose of the response speed of load switch is improved.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment weight
Point explanation is all difference from other examples, and the same or similar parts between the embodiments can be referred to each other.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that article or equipment including a series of elements include not only those elements, but also
Including other elements that are not explicitly listed, or further include for this article or the intrinsic element of equipment.Do not having
In the case of more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article for including above-mentioned element
Or there is also other identical elements in equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (10)
1. a kind of ON-OFF control circuit, which is characterized in that be applied to load switch, the ON-OFF control circuit includes：
Signal input part, power voltage input terminal, first voltage control output end, the first capacitance, first switch pipe, the first electric current
Source and second switch pipe；
One end of first capacitance is connect with the signal input part；
The other end of first capacitance and the output end of first current source and the first end phase of the first switch pipe
Even；
Power voltage input terminal of the input terminal of the current source as the ON-OFF control circuit, for receiving supply voltage
Input；
The control terminal of the first switch pipe and the first end of the first switch pipe and the control terminal of the second switch pipe
Connection；
The second end of the first switch pipe is connected with the second end of the second switch pipe, and is grounded；
The first end of the second switch pipe is as the first voltage control output end, for controlling the disconnected of the load switch
Open and close are closed.
2. ON-OFF control circuit according to claim 1, which is characterized in that further include first resistor and the second capacitance；
Wherein, one end of the first resistor is connected with the second end of the first switch pipe, and the other end is inputted with the signal
End connection；
One end of second capacitance is connected with the second end of the first switch pipe, other end ground connection.
3. a kind of load switch, which is characterized in that including：
ON-OFF control circuit, main switch and drive module；
Wherein, the ON-OFF control circuit is ON-OFF control circuit as claimed in claim 1 or 2；
The first voltage control output end of the control terminal of the main switch and the drive module and the ON-OFF control circuit
It is connected, the drive module is used to provide driving voltage for the main switch, and be turned on or off the main switch；
The first end of the main switch is connected with the signal input part of the ON-OFF control circuit；
Signal output end of the second end of the main switch as the load switch.
4. load switch according to claim 3, which is characterized in that the drive module includes：Second current source and neat
Receive diode；
The input terminal of second current source is connected with the power voltage input terminal；
The output end of second current source is connected with the control terminal of the main switch；
The anode of the Zener diode is connected with the second end of the main switch；
The cathode of the Zener diode is connected with the control terminal of the main switch.
5. load switch according to claim 4, which is characterized in that further include overpressure treatment module；
The input terminal of the overpressure treatment module is connect with the signal input part；
The output end of the overpressure treatment module is connect with the control terminal of the main switch；
When the voltage signal pace of change of the signal input part is greater than or equal to the first predetermined threshold value, the switch control electricity
Road controls the main switch shutdown；
When the voltage signal pace of change of the signal input part is less than first predetermined threshold value, the overpressure treatment module
Control the main switch shutdown.
6. load switch according to claim 5, which is characterized in that the ranging from 1V/100ns of first predetermined threshold value
~10V/100ns, including endpoint value.
7. load switch according to claim 5, which is characterized in that the overpressure treatment module includes：
Input voltage division module, comparison module and closedown module；
The input voltage division module includes：Input terminal, input terminal and ground terminal；
The comparison module includes first input end, the second input terminal and output end；
The closedown module includes first end, second end and control terminal；
Wherein, the input terminal of the input voltage division module is connect with the signal input part；
The output end of the input voltage division module is connected with the first input end of the comparison module；
Second input terminal of the comparison module is connected with reference voltage source, receives the input of reference voltage；
The output end of the comparison module is connected with the control terminal of the closedown module；
The first end of the closedown module is connected with the control terminal of the main switch；
The second end of the closedown module is grounded.
8. load switch according to claim 7, which is characterized in that the closedown module includes third switching tube；
First end of the first end of the third switching tube as the closedown module；
Second end of the second end of the third switching tube as the closedown module；
Control terminal of the control terminal of the third switching tube as the closedown module.
9. load switch according to claim 8, which is characterized in that
The input voltage division module includes the second resistance and 3rd resistor being sequentially connected in series；
The one end of the second resistance far from the 3rd resistor is connected with the signal input part；
One end ground connection of the 3rd resistor far from the second resistance；
Output end of the common end of the second resistance and the 3rd resistor as the input voltage division module；
The comparison module includes operational amplifier；
First input end of the in-phase input end of the operational amplifier as the comparison module；
Second input terminal of the inverting input of the operational amplifier as the comparison module.
10. load switch according to claim 8 or claim 9, which is characterized in that the first switch pipe, the second switch
Pipe, the third switching tube are NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750728.4A CN108599100B (en) | 2018-07-10 | 2018-07-10 | Switch control circuit and load switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750728.4A CN108599100B (en) | 2018-07-10 | 2018-07-10 | Switch control circuit and load switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108599100A true CN108599100A (en) | 2018-09-28 |
| CN108599100B CN108599100B (en) | 2024-02-09 |
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|---|---|---|---|
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| CN108599100B (en) | 2024-02-09 |
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Address after: Room 1201, No.2, Lane 908, Xiuwen Road, Minhang District, Shanghai, 201199 Patentee after: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region after: China Address before: Room 303-39, building 33, 680 Guiping Road, Xuhui District, Shanghai 200233 Patentee before: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region before: China |