CN108134366B - A kind of overvoltage crowbar, over-voltage protection method and device - Google Patents
A kind of overvoltage crowbar, over-voltage protection method and device Download PDFInfo
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- CN108134366B CN108134366B CN201711392723.0A CN201711392723A CN108134366B CN 108134366 B CN108134366 B CN 108134366B CN 201711392723 A CN201711392723 A CN 201711392723A CN 108134366 B CN108134366 B CN 108134366B
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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
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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
- H02H3/006—Calibration or setting of parameters
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Abstract
This application discloses a kind of overvoltage crowbar, over-voltage protection method and devices; the overvoltage crowbar includes reference voltage selection circuit, overvoltage protection comparator, power tube drive module and input voltage division module, in which: the reference voltage selection circuit includes climbing speed detection circuit, control circuit and regulating circuit；The climbing speed detection circuit is used to detect the climbing speed of input voltage；The control circuit is used to control the voltage that the regulating circuit output matches with the climbing speed, and the climbing speed is bigger, and the output voltage of the regulating circuit is smaller；The input voltage division module is used to obtain the partial pressure of the input voltage；The overvoltage protection comparator is used to export the level signal for disconnecting subsequent conditioning circuit for controlling the power tube drive module when the partial pressure for detecting the input voltage is more than the output voltage of the control circuit.The application, which is avoided, causes damages to subsequent conditioning circuit because the over-voltage turn-off response time is longer.
Description
Technical field
The present invention relates to semiconductor integrated circuit technology fields, more specifically to a kind of overvoltage crowbar, over-voltage
Guard method and device.
Background technique
Overvoltage crowbar, for the partial pressure for detecting input voltage be more than reference voltage when (such as occur surge electricity
When pressure), it is considered as the pressure voltage that input voltage has been more than overvoltage crowbar subsequent conditioning circuit, disconnects subsequent conditioning circuit at this time, to keeps away
Exempt from subsequent conditioning circuit performance degradation occurs because bearing excessive voltage or even directly burns.
Overvoltage crowbar, to subsequent conditioning circuit is disconnected, needs one from detecting that the partial pressure of input voltage is more than reference voltage
Fixed response time, referred to as over-voltage turn-off response time.The over-voltage turn-off response time is longer, more to subsequent conditioning circuit harm
Greatly.
Summary of the invention
In view of this, the present invention provides a kind of overvoltage crowbar, over-voltage protection method and device, closed to avoid because of over-voltage
The disconnected response time is longer and causes damages to subsequent conditioning circuit.
A kind of overvoltage crowbar, including reference voltage selection circuit, overvoltage protection comparator, power tube drive module and
Input voltage division module, in which:
The reference voltage selection circuit includes climbing speed detection circuit, control circuit and regulating circuit；
The climbing speed detection circuit, for detecting the climbing speed of input voltage；
The control circuit, the voltage to match for controlling the regulating circuit output with the climbing speed are described
Climbing speed is bigger, and the output voltage of the regulating circuit is smaller；
The input voltage division module, for obtaining the partial pressure of the input voltage；
One input terminal of the overvoltage protection comparator receives the partial pressure of the input voltage, and another input terminal receives institute
The output voltage for stating control circuit, for being more than the output voltage of the control circuit in the partial pressure for detecting the input voltage
When, export the level signal that subsequent conditioning circuit is disconnected for controlling the power tube drive module.
Optionally, the climbing speed detection circuit includes trigger signal generator and sequence signal generator, in which:
The trigger signal generator, for generating a trigger signal, the climbing speed is faster, the trigger signal
More early generation；
The sequence signal generator, for generating sequence signal corresponding with the generation moment of the trigger signal；
It is corresponding, the control circuit, the electricity to match for controlling the regulating circuit output with the sequence signal
Pressure, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
Optionally, the trigger signal generator includes first resistor, second resistance, 3rd resistor, operational amplifier,
The comparator that one N type switch tube, the first p-type switching tube, the second p-type switching tube, the second N type switch tube, capacitor, output negate,
Wherein:
The first resistor and the second resistance are in sequential series between the input voltage and ground；
The non-inverting input terminal of the operational amplifier connects the common end of the first resistor Yu the second resistance, anti-
Phase input terminal is grounded through the 3rd resistor, and the output end of the operational amplifier connects the control of first N type switch tube
End；
The first end of first N type switch tube is grounded through the 3rd resistor；
The control of the first p-type switching tube terminates the control terminal of the second p-type switching tube；
First termination power of the first p-type switching tube and the second p-type switching tube；
The second end of the first p-type switching tube is connected to the control terminal of body and the second end of first N type switch tube；
On the one hand the second end of the second p-type switching tube connects what the output negated on the one hand through the capacity earth
The inverting input terminal of comparator；
The non-inverting input terminal for exporting the comparator negated receives a reference voltage signal；
Second N type switch tube is in parallel with capacitor.
Optionally, the sequence signal generator includes multiple d type flip flops, in which:
The synchronization set end of each d type flip flop inputs different benchmark pulse width signals, and the clocked signal of each d type flip flop is defeated
Enter the end input output voltage for exporting the comparator negated；
The state of each d type flip flop serially constitutes the sequence signal.
Optionally, the control circuit enables the regulating circuit generate switch combination shape corresponding with the sequence signal
State；
The regulating circuit includes that multiple switch and multiple resistance change for the variation with own switch assembled state
The resistance value of itself divider resistance is to change itself output voltage.
A kind of over-voltage protection method, comprising:
Detect the climbing speed of input voltage；
The voltage that control regulating circuit output matches with the climbing speed, the climbing speed is bigger, the pressure regulation
The output voltage of circuit is smaller；
Obtain the partial pressure of the input voltage；
Judge the input voltage partial pressure whether be more than the regulating circuit output voltage, when the input voltage
When partial pressure is more than the output voltage of the regulating circuit, the control instruction for disconnecting subsequent conditioning circuit is issued.
Optionally, the climbing speed of the detection input voltage, comprising: generate a trigger signal, the climbing speed
It is faster, the more early generation of trigger signal；And generate sequence signal corresponding with the generation moment of the trigger signal；
Voltage corresponding, that the control regulating circuit output matches with the climbing speed, the climbing speed are got over
Greatly, the output voltage of the regulating circuit is smaller, comprising: the electricity that control regulating circuit output matches with the sequence signal
Pressure, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
A kind of over-pressure safety device, comprising:
Climbing speed detection unit, for detecting the climbing speed of input voltage；
First control unit, the voltage to match for controlling regulating circuit output with the climbing speed, the rising
Rate is bigger, and the output voltage of the regulating circuit is smaller；
Acquiring unit, for obtaining the partial pressure of the input voltage；
Whether the second control unit, the partial pressure for judging the input voltage are electric more than the output of the regulating circuit
Pressure issues the control for disconnecting subsequent conditioning circuit when the partial pressure of the input voltage is more than the output voltage of the regulating circuit
System instruction.
Optionally, the climbing speed detection unit is specifically used for generating a trigger signal, and the climbing speed is faster,
The more early generation of trigger signal；And generate sequence signal corresponding with the generation moment of the trigger signal；
Corresponding, the first control unit is specifically used for what control regulating circuit output matched with the sequence signal
Voltage, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
It can be seen from the above technical scheme that the basic function of overvoltage crowbar is in point for detecting input voltage
When pressure is more than reference voltage, subsequent conditioning circuit is disconnected.And the present invention is according to the speed of input voltage climbing speed, is overvoltage protection electricity
The reference voltage of road selection different stalls just selects biggish reference voltage when input voltage climbing speed is slower, is inputting
When voltage increase rate is very fast, lesser reference voltage is just selected, to realize the advance decision of overvoltage crowbar, close ahead of time
It is disconnected, it avoids to cause damages to subsequent conditioning circuit because the over-voltage turn-off response time is longer in this way.
Detailed description of the invention
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 technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of overvoltage crowbar structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 2 shows the structural schematic diagrams of climbing speed detection circuit 101 in overvoltage crowbar shown in Fig. 1；
Fig. 3 is a kind of trigger signal generator structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 4 is a kind of sequence signal generator structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 5 is that the embodiment of the present invention discloses a kind of signal timing diagram；
Fig. 6 is a kind of regulating circuit structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 7 is a kind of over-voltage protection method flow chart disclosed by the embodiments of the present invention；
Fig. 8 is a kind of over-pressure safety device structural schematic diagram disclosed by the embodiments of the present invention.
Specific embodiment
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 description, 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.
Referring to Fig. 1, the embodiment of the invention discloses a kind of overvoltage crowbars, including reference voltage selection circuit 100, mistake
Pressure protection comparator 200, power tube drive module 300 and input voltage division module 400, in which:
Reference voltage selection circuit 100 includes climbing speed detection circuit 101, control circuit 102 and regulating circuit 103；
Climbing speed detection circuit 101, for detecting the climbing speed k of input voltage VIN；
Control circuit 102, the voltage VREF_OV to match for controlling the output of regulating circuit 103 with climbing speed k, on
Raising speed rate k is bigger, and the value of voltage VREF_OV is smaller；
Input voltage division module 400, for obtaining the partial pressure VIN_DIV of input voltage VIN；
One input terminal of overvoltage protection comparator 200 receives partial pressure VIN_DIV, and another input terminal receives voltage VREF_
OV, for when detecting that partial pressure VIN_DIV is more than voltage VREF_OV, output to be disconnected for controlling power tube drive module 300
The level signal of subsequent conditioning circuit.
It is more than reference voltage that the basic function of overvoltage crowbar, which is in the partial pressure VIN_DIV for detecting input voltage VIN,
When, disconnect subsequent conditioning circuit.And the embodiment of the present invention is according to the speed of the climbing speed k of input voltage VIN, is overvoltage crowbar
The reference voltage of selection different stalls just selects biggish reference voltage when the climbing speed k of input voltage VIN is slower,
When the climbing speed k of input voltage VIN is very fast, lesser reference voltage is just selected, to realize shifting to an earlier date for overvoltage crowbar
Judgement turns off ahead of time, avoids to cause damages to subsequent conditioning circuit because the over-voltage turn-off response time is longer in this way.
Illustrate, it is assumed that the reference voltage that certain overvoltage crowbar is set as 15V, over-voltage turn-off response time be 1S,
Then overvoltage crowbar delay 1S really after the partial pressure VIN_DIV of input voltage VIN reaches 15V just really turns off rear class
Circuit, not meeting partial pressure VIN_DIV is more than the perfect condition that 15V immediately turns off late-class circuit, specific: if on input voltage
Raising speed rate is 1V/1S, then the overvoltage crowbar just will really disconnect subsequent conditioning circuit when input voltage rises to 16V, not be inconsistent
Closing partial pressure VIN_DIV is more than that reference voltage can be reduced to by the perfect condition that 15V is immediately turned off to solve this problem
14V, the overvoltage crowbar will really disconnect subsequent conditioning circuit when input voltage rises to 15V just at this time；And if input
Voltage increase rate is 1.5V/1S, which just will really disconnect subsequent electricity when input voltage rises to 16.5V
Road, not meeting partial pressure VIN_DIV equally is more than the perfect condition that 15V is immediately turned off, and to solve this problem, can will refer to electricity
Pressure is reduced to 13.5V, and the overvoltage crowbar will really disconnect subsequent conditioning circuit when input voltage rises to 15V just at this time.
As it can be seen that the climbing speed k of input voltage VIN is faster, reference voltage will select a smaller value, realize advance decision, mention
Early shutdown.
Optionally, referring to fig. 2, climbing speed detection circuit 101 specifically includes trigger signal generator 1011 and sequence letter
Number generator 1012, in which:
Trigger signal generator 1011, for generating a trigger signal, climbing speed k is faster, and the trigger signal is got over
It is early to generate；
Sequence signal generator 1012, for generating sequence signal corresponding with the generation moment of the trigger signal,
It is according to the sequence signal being currently generated it can be learnt that current to obtain sequence signal corresponding with the speed of climbing speed k
Climbing speed k, realize the detection to climbing speed k.The sequence signal refers to by 1 and 0 number by certain rule ordering
The serial digital signal of arrangement；
It is corresponding, control circuit 102, the voltage to match for controlling the output of regulating circuit 103 with the sequence signal,
For sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller, thus rate of rise k
Faster, the more early arrival of trigger signal, the output voltage of the regulating circuit is smaller.
For example, the relationship between control circuit 102 and regulating circuit 103 may is that control circuit 102 enables regulating circuit
103 generate switch combination state corresponding with the sequence signal；Regulating circuit 103 includes multiple switch and multiple resistance,
For the variation with own switch assembled state, change the resistance value of itself divider resistance to change itself output voltage.
Optionally, referring to Fig. 3, trigger signal generator 1011 specifically includes first resistor R1, second resistance R2, third electricity
Hinder R3, operational amplifier OP, the first N type switch tube M1, the first p-type switching tube M2, the second p-type switching tube M3, the second N-type switch
The comparator COMP2 that pipe M4, capacitor C1, output negate, in which:
First resistor R1 and second resistance R2 are in sequential series between input voltage VIN and ground；
The common end of non-inverting input terminal connection the first resistor R1 and second resistance R2 of operational amplifier OP, anti-phase input
End is grounded through 3rd resistor R3, and the output end of operational amplifier OP connects the control terminal of the first N type switch tube M1；
The first end of first N type switch tube M1 is grounded through 3rd resistor R3；
The control terminal of the second p-type switching tube M3 of control termination of first p-type switching tube M2；
The first termination power vd D of first p-type switching tube M2 and the second p-type switching tube M3；
The control terminal and the first N type switch tube M1 of the second first p-type switching tube M2 of termination of first p-type switching tube M2
Second end；
On the one hand the second end of second p-type switching tube M3 is grounded through capacitor C1, on the one hand connect the comparator that output negates
The inverting input terminal of COMP2；
The non-inverting input terminal for exporting the comparator COMP2 negated receives a reference voltage signal VREF1；
Second N type switch tube M4 is in parallel with capacitor C1.
Switching tube M1~M4 can be MOSFET (Metal-Oxide-Semiconductor Field-Effect
Transistor, Metal Oxide Semiconductor Field Effect Transistor), it is also possible to triode.By taking switching tube M1 as an example, work as switch
When pipe M1 is MOSFET, the first end of switching tube M1 is the source electrode of MOSFET, and the second end of switching tube M1 is the drain electrode of MOSFET,
The control terminal of switching tube M1 is the grid of MOSFET.When switching tube M1 is triode, the first end of switching tube M1 is triode
Emitter, the second end of switching tube M1 is the collector of triode, and the control terminal of switching tube M1 is the base stage of triode.
The working principle of trigger signal generator 1011 shown in Fig. 3 is as follows.
R1, R2, R3, OP, M1 and M2 constitute Voltage-current conversion circuit, specific: the non-inverting input terminal of operational amplifier OP
Voltage is VIN*R2/ (R1+R2), and the same phase of operational amplifier OP, inverting input terminal voltage are equal, so flowing through the electric current of R3
I1=VIN*R2/ (R1+R2)/R3, the rate of rise k of input voltage VIN are equal to the rate of rise of electric current I1.
M2 and M3 constitutes a proportional current mirror, flows through the electric current I2 and I1 of M3 in certain proportion relationship, so electric current I2
The rate of rise be equal to the rate of rise of electric current I1, and then the rate of rise of electric current I2 is equal to the rising of input voltage VIN
Slope k.
When the control terminal input signal RESET of M4 is low level, electric current I2 is capacitor C1 charging, capacitor C1 under initial time
Both end voltage VC1 is lower, and the output voltage OUT of COMP1 is low level；As the charging time is increasingly longer, VC1 is gradually risen to
Non-inverting input terminal voltage equal to COMP1, the output voltage OUT of COMP1 is high level at this time, obtains a rising edge pulse,
As the trigger signal.The rate of rise of electric current I2 is bigger, to faster, the more early arrival of rising edge of capacitor C1 charging, that is,
It says, the rate of rise k of input voltage VIN is bigger, the more early arrival of rising edge.When the control terminal input signal RESET of M4 turns over high, electricity
Hold C1 and discharge whole energy storage, trigger signal generator 1011 enters initialization.
Optionally, referring to fig. 4, sequence signal generator 1012 specifically includes N number of d type flip flop, the synchronization of each d type flip flop
Set end inputs different benchmark pulse width signals, the output voltage of the clocked signal input terminal input COMP2 of each d type flip flop
OUT；The state of each d type flip flop serially constitutes the sequence signal.Fig. 4 is only with N=4 as an example, the shape of four d type flip flops
State is followed successively by Q1, Q2, Q3, Q4.
D type flip flop includes that synchronous set end D, clocked signal input terminal Clk, reset terminal Reset, the output end Q and complementation are defeated
OutletReferred to as D is touched when generally using the state of Q as the state of d type flip flop, when Q=0, referred to as d type flip flop state is 0, Q=1
Sending out device state is 1.The function of d type flip flop describes are as follows: when clocked signal rising edge arrives, the d type flip flop state if D=1
Set 1；D type flip flop state sets 0 if instead D=0.
Fig. 5 list four d type flip flops synchronization set end input benchmark pulse width signal, be successively TREFT1,
TREFT2, TREFT3, TREFT4, TREFT1 turn over low at the t1 moment, and TREFT2 turns over low at the t2 moment, and TREFT1 is turned at the t3 moment
Low, TREFT1 turns over low, t1 < t2 < t3 < t4 at the t4 moment.Assuming that rate of rise k is smaller under the first scene, corresponding acquisition
The rising edge of OUT signal appear in the t4 moment after (referring to Fig. 5), then Q1=0, Q2=0, Q3=0, Q4=0, i.e. acquisition sequence
Signal 0000.Assuming that k is slightly larger under the second scene, the rising edge of the corresponding OUT signal obtained appear in the t3 moment after, the t4 moment
(not shown) before, then Q1=0, Q2=0, Q3=0, Q4=1, that is, obtain sequence signal 0001.Assuming that k under third scene
Bigger, there is (not shown) before time tl in the rising edge of the corresponding OUT signal obtained, then Q1=1, Q2=1, Q3=
1, Q4=1, i.e. acquisition sequence signal 1111.Signal RESET is also used to reset the output of each d type flip flop, specifically, each D
The reset terminal Reset while confidence RESET of trigger, when signal RESET turns over high, the output of four d type flip flops is all 0,
Sequence signal generator 1012 enters initialization.
Example based on Fig. 5, referring to Fig. 6, regulating circuit 103 may include the 4th resistance R4, the 5th resistance R5, the 6th electricity
Resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, first switch S1, second switch S2, third switch S3, the 4th open
Close S4, the 5th switch S5, the 6th switch S6, the 7th switch S7, the 8th switch S8, in which:
4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 are sequentially
It is connected between power supply VRET and ground；
First switch S1 be connected to the 4th resistance R4 and the 5th resistance R5 common end and regulating circuit 103 output end it
Between；
Second switch S2, the 6th switch S6, the 8th switch S8 public affairs in sequential series in the 5th resistance R5 and the 6th resistance R6
Altogether between end and the output end of regulating circuit 103；
Third switch S3, the 6th switch S6, the 8th switch S8 public affairs in sequential series in the 6th resistance R6 and the 7th resistance R7
Altogether between end and the output end of regulating circuit 103；
4th switch S4, the 7th switch S7, the 8th switch S8 public affairs in sequential series in the 7th resistance R7 and the 8th resistance R8
Altogether between end and the output end of regulating circuit 103；
5th switch S5, the 7th switch S7, the 8th switch S8 public affairs in sequential series in the 8th resistance R8 and the 9th resistance R9
Altogether between end and the output end of regulating circuit 103.
Control circuit 102 is when sequence signal 0000 generates, control S1 closure, at this time the output voltage of regulating circuit 103
VREF_OV meets
For control circuit 102 when sequence signal 0001 generates, control S2, S6, S8 closure, regulating circuit 103 is defeated at this time
Voltage VREF_OV meets out
For control circuit 102 when sequence signal 1111 generates, control S5, S7, S8 closure, regulating circuit 103 is defeated at this time
Voltage VREF_OV meets out
Certainly, it may occur to persons skilled in the art that, when generating other sequences signal, regulating circuit 103 it is defeated
Voltage VREF_OV also will accordingly change out, no longer illustrate one by one herein.
As it can be seen that climbing speed k is faster, and the more early arrival of trigger signal, the output voltage VREF_OV of regulating circuit 103
It is smaller.Thus, it is possible to realize the advance decision of overvoltage crowbar, turn off ahead of time, avoided in this way because of over-voltage turn-off response
Time is longer and causes damages to subsequent conditioning circuit.
Corresponding with above-described embodiment, the embodiment of the invention also discloses a kind of over-voltage protection methods, which is characterized in that
As shown in fig. 7, comprises:
Step S01: the climbing speed of input voltage is detected；
Step S02: the voltage that control regulating circuit output matches with the climbing speed, the climbing speed is bigger,
The output voltage of the regulating circuit is smaller；
Step S03: the partial pressure of the input voltage is obtained；
Step S04: judge the input voltage partial pressure whether be more than the regulating circuit output voltage, when described defeated
When entering the output voltage of voltage divided more than the regulating circuit, S05 is entered step；
Step S05: the control instruction for disconnecting subsequent conditioning circuit is issued.
Optionally, the climbing speed of the detection input voltage, comprising: generate a trigger signal, the climbing speed
It is faster, the more early generation of trigger signal；And generate sequence signal corresponding with the generation moment of the trigger signal；
Voltage corresponding, that the control regulating circuit output matches with the climbing speed, the climbing speed are got over
Greatly, the output voltage of the regulating circuit is smaller, comprising: the electricity that control regulating circuit output matches with the sequence signal
Pressure, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
Corresponding with above-described embodiment, the embodiment of the invention also discloses a kind of over-pressure safety devices, as shown in figure 8,
Include:
Climbing speed detection unit 10, for detecting the climbing speed of input voltage；
First control unit 20, the voltage to match for controlling regulating circuit output with the climbing speed, it is described on
Raising speed rate is bigger, and the output voltage of the regulating circuit is smaller；
Acquiring unit 30, for obtaining the partial pressure of the input voltage；
Whether the second control unit 40, the partial pressure for judging the input voltage are electric more than the output of the regulating circuit
Pressure issues the control for disconnecting subsequent conditioning circuit when the partial pressure of the input voltage is more than the output voltage of the regulating circuit
System instruction.
Optionally, climbing speed detection unit 10 is specifically used for generating a trigger signal, and the climbing speed is faster, institute
State the more early generation of trigger signal；And generate sequence signal corresponding with the generation moment of the trigger signal；
Corresponding, first control unit 20 is specifically used for the electricity that control regulating circuit output matches with the sequence signal
Pressure, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
In conclusion it is more than reference voltage that the basic function of overvoltage crowbar, which is in the partial pressure for detecting input voltage,
When, disconnect subsequent conditioning circuit.And the present invention selects different stalls according to the speed of input voltage climbing speed for overvoltage crowbar
Reference voltage just select biggish reference voltage when input voltage climbing speed is slower, input voltage climbing speed compared with
When fast, just select lesser reference voltage, thus realize the advance decision of overvoltage crowbar, ahead of time turn off, in this way it is avoided that
It causes damages to subsequent conditioning circuit because the over-voltage turn-off response time is longer.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also including
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that in the mistake including element
There is also other identical elements in journey, method, commodity or equipment.
For system embodiments, since it essentially corresponds to embodiment of the method, so describe fairly simple, it is related
Place illustrates referring to the part of embodiment of the method.The apparatus embodiments described above are merely exemplary, wherein institute
Stating unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit can
To be or may not be physical unit, it can it is in one place, or may be distributed over multiple network units.
Some or all of the modules therein can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.This field is general
Logical technical staff can understand and implement without creative efforts.
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 readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest scope of features of novelty.
Claims (6)
1. a kind of overvoltage crowbar, which is characterized in that including reference voltage selection circuit, overvoltage protection comparator, power tube
Drive module and input voltage division module, in which:
The reference voltage selection circuit includes climbing speed detection circuit, control circuit and regulating circuit；
The climbing speed detection circuit, for detecting the climbing speed of input voltage；
The control circuit, the voltage to match for controlling the regulating circuit output with the climbing speed, the rising
Rate is bigger, and the output voltage of the regulating circuit is smaller；
The input voltage division module, for obtaining the partial pressure of the input voltage；
One input terminal of the overvoltage protection comparator receives the partial pressure of the input voltage, and another input terminal receives the control
The output voltage of circuit processed, when for being more than the output voltage of the control circuit in the partial pressure for detecting the input voltage,
Export the level signal that subsequent conditioning circuit is disconnected for controlling the power tube drive module；
The climbing speed detection circuit includes trigger signal generator and sequence signal generator, in which:
The trigger signal generator, for generating a trigger signal, the climbing speed is faster, and the trigger signal is more early
It generates；
The sequence signal generator, for generating sequence signal corresponding with the generation moment of the trigger signal；
Corresponding, the control circuit exports the voltage to match with the sequence signal for controlling the regulating circuit, right
The sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match are smaller.
2. overvoltage crowbar according to claim 1, which is characterized in that the trigger signal generator includes the first electricity
Resistance, second resistance, 3rd resistor, operational amplifier, the first N type switch tube, the first p-type switching tube, the second p-type switching tube,
The comparator that two N type switch tubes, capacitor, output negate, in which:
The first resistor and the second resistance are in sequential series between the input voltage and ground；
The non-inverting input terminal of the operational amplifier connects the common end of the first resistor Yu the second resistance, and reverse phase is defeated
Enter end to be grounded through the 3rd resistor, the output end of the operational amplifier connects the control terminal of first N type switch tube；
The first end of first N type switch tube is grounded through the 3rd resistor；
The control of the first p-type switching tube terminates the control terminal of the second p-type switching tube；
First termination power of the first p-type switching tube and the second p-type switching tube；
The second end of the first p-type switching tube is connected to the control terminal of body and the second end of first N type switch tube；
On the one hand the second end of the second p-type switching tube connects the comparison for exporting and negating on the one hand through the capacity earth
The inverting input terminal of device；
The non-inverting input terminal for exporting the comparator negated receives a reference voltage signal；
Second N type switch tube is in parallel with capacitor.
3. overvoltage crowbar according to claim 2, which is characterized in that the sequence signal generator includes multiple D
Trigger, in which:
The synchronization set end of each d type flip flop inputs different benchmark pulse width signals, the clocked signal input terminal of each d type flip flop
Input the output voltage of the comparator for exporting and negating；
The state of each d type flip flop serially constitutes the sequence signal.
4. overvoltage crowbar according to claim 1, which is characterized in that the control circuit enables the regulating circuit produce
Raw switch combination state corresponding with the sequence signal；
The regulating circuit includes that multiple switch and multiple resistance for the variation with own switch assembled state change itself
The resistance value of divider resistance is to change itself output voltage.
5. a kind of over-voltage protection method characterized by comprising
Detect the climbing speed of input voltage；
The voltage that control regulating circuit output matches with the climbing speed, the climbing speed is bigger, the regulating circuit
Output voltage it is smaller；
Obtain the partial pressure of the input voltage；
Judge the input voltage partial pressure whether be more than the regulating circuit output voltage, when the partial pressure of the input voltage
More than the regulating circuit output voltage when, issue the control instruction for disconnecting subsequent conditioning circuit；
The climbing speed of the detection input voltage, comprising: generate a trigger signal, the climbing speed is faster, the touching
The more early generation of signalling；And generate sequence signal corresponding with the generation moment of the trigger signal；
Voltage corresponding, that the control regulating circuit output matches with the climbing speed, the climbing speed is bigger, institute
The output voltage for stating regulating circuit is smaller, comprising: the voltage that control regulating circuit output matches with the sequence signal, for
Sequence signal corresponding to more early trigger signal, the voltage to match are smaller with the generation moment.
6. a kind of over-pressure safety device characterized by comprising
Climbing speed detection unit, for detecting the climbing speed of input voltage；
First control unit, the voltage to match for controlling regulating circuit output with the climbing speed, the climbing speed
Bigger, the output voltage of the regulating circuit is smaller；
Acquiring unit, for obtaining the partial pressure of the input voltage；
Second control unit, for judge the input voltage partial pressure whether be more than the regulating circuit output voltage, when
When the partial pressure of the input voltage is more than the output voltage of the regulating circuit, sending refers to for disconnecting the control of subsequent conditioning circuit
It enables；
The climbing speed detection unit is specifically used for generating a trigger signal, and the climbing speed is faster, the triggering letter
Number more early generation；And generate sequence signal corresponding with the generation moment of the trigger signal；
Corresponding, the first control unit is specifically used for the electricity that control regulating circuit output matches with the sequence signal
Pressure, for sequence signal corresponding to the trigger signal more early with the generation moment, the voltage to match is smaller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711392723.0A CN108134366B (en) | 2017-12-21 | 2017-12-21 | A kind of overvoltage crowbar, over-voltage protection method and device |
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| CN201711392723.0A CN108134366B (en) | 2017-12-21 | 2017-12-21 | A kind of overvoltage crowbar, over-voltage protection method and device |
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| CN108134366B true CN108134366B (en) | 2019-06-14 |
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| CN112003236B (en) * | 2020-08-28 | 2022-09-23 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
| CN112234582B (en) * | 2020-09-22 | 2023-05-26 | 深圳市晨北科技有限公司 | Overvoltage detection circuit and control device thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010144077A1 (en) * | 2009-06-08 | 2010-12-16 | Hewlett-Packard Development Company, L.P. | Decreasing voltage detection with control signaling |
| CN103229400A (en) * | 2010-10-06 | 2013-07-31 | 阿尔斯通技术有限公司 | Method and device to protect an ESP power supply from transient over-voltages on the power grid |
| CN106300246A (en) * | 2016-09-30 | 2017-01-04 | 英特格灵芯片(天津)有限公司 | Overvoltage crowbar |
-
2017
- 2017-12-21 CN CN201711392723.0A patent/CN108134366B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010144077A1 (en) * | 2009-06-08 | 2010-12-16 | Hewlett-Packard Development Company, L.P. | Decreasing voltage detection with control signaling |
| CN103229400A (en) * | 2010-10-06 | 2013-07-31 | 阿尔斯通技术有限公司 | Method and device to protect an ESP power supply from transient over-voltages on the power grid |
| CN106300246A (en) * | 2016-09-30 | 2017-01-04 | 英特格灵芯片(天津)有限公司 | Overvoltage crowbar |
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| CN108134366A (en) | 2018-06-08 |
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