CN109301794A - A kind of ultrahigh speed short-circuit protection circuit that can restore automatically - Google Patents
A kind of ultrahigh speed short-circuit protection circuit that can restore automatically Download PDFInfo
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- CN109301794A CN109301794A CN201811326376.6A CN201811326376A CN109301794A CN 109301794 A CN109301794 A CN 109301794A CN 201811326376 A CN201811326376 A CN 201811326376A CN 109301794 A CN109301794 A CN 109301794A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—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 current
-
- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- 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
- H02H3/08—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 current
- H02H3/087—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 current for dc applications
Abstract
The present invention discloses a kind of ultrahigh speed short-circuit protection circuit that can restore automatically; ontology circuit includes the short-circuit protection ontology circuit equipped with signal input part B and signal output end A; the source electrode of the first switch metal-oxide-semiconductor Q1 of grid connection signal output terminals A and one end connection first switch metal-oxide-semiconductor Q1 and the first resistor RS of other end ground connection；Auxiliary circuit includes the burr absorption circuit of one end connection Vout- and other end ground connection, and the short-circuit peak current diverting route in parallel with first resistor RS；The signal input part B connection of short-circuit protection ontology circuit, when signal output end A exports high level or high impedance, first switch metal-oxide-semiconductor Q1 conducting is worked normally；When short-circuit trigger voltage is more than setting value, signal output end A level is dragged down, first switch metal-oxide-semiconductor Q1 cut-off, short-circuit protection.Reaction speed of the present invention is ultrafast, adapts to voltage, the various short actions of superelevation, restores automatically after short-circuit protection, with high safety to be effectively protected.
Description
Technical field
The invention belongs to all kinds of linear constant current power supplys, the power technique fields of all kinds of constant voltage outputs, and in particular to Yi Zhongke
Automatically the ultrahigh speed short-circuit protection circuit restored.
Background technique
Due to the further development of current illumination market, in order to meet cost needs, there are more and more high pressure AC in market
Linear Driving or high pressure DC Linear Driving and boosting constant pressure+constant current driving.Existing high-voltage linear constant current technology or boosting are permanent
Pressure+constant current driving is all that multiple LED series connection are directly connected to high voltage bus, the either 110Vac of low pressure or high pressure 230Vac,
Even direct current 450V high pressure, can all have a problem that: be unable to the both ends of direct short-circuit LED light string；When output or LED load lamp
When short circuit occurs for string, because output voltage height will generate very big short-circuit peak current, can constant-voltage to front and
The concatenated element of power loop generates very big damage or even moment and burns, while can also couple to peripheral circuit very big in the past
Due to voltage spikes, so that its cisco unity malfunction is even caused whole system instant failure.To accomplish in this case slightly
It is quite difficult to stablize a little protections, let alone ideal short-circuit protection, also some products have corresponding short-circuit protection mechanism certainly, but
Be only limited to finite number of time or protection act in the short time come when reducing short circuit to the destruction of circuit；If it is continuously
ON/OFF short circuit, or lasting holding short circuit, then corresponding device just will appear damage.
In conclusion product on the market does not go to solve from problem at present, then product is without reliable short at all
Road protection mechanism will also significantly limit the use of such circuit to actual production and using very big hidden danger is caused
Range.
Summary of the invention
In order to solve the above problems existing in the present technology, it is an object of that present invention to provide the superelevation that one kind can be restored automatically
Fast short-circuit protection circuit.Present invention seek to address that existing all kinds of Linear Drivings, including high pressure AC Linear Driving, high pressure DC are linear
The short circuit problem that high voltage output caused by driving and voltage increase and current constant driving occurs.
The technical scheme adopted by the invention is as follows:
A kind of ultrahigh speed short-circuit protection circuit that can restore automatically, including the ontology circuit being set on power loop and auxiliary
Circuit；
The ontology circuit includes the short-circuit protection ontology circuit equipped with signal input part B and signal output end A, and grid connects
The source electrode and the other end for meeting the first switch metal-oxide-semiconductor Q1 and one end connection first switch metal-oxide-semiconductor Q1 of signal output end A are grounded
First resistor RS, the drain electrode of first switch metal-oxide-semiconductor Q1 connects Vout-；
The auxiliary circuit include one end connection Vout- and the other end ground connection burr absorption circuit, and with first electricity
Hinder the short-circuit peak current diverting route of RS parallel connection；
The signal input part B of the short-circuit protection ontology circuit is connected on power loop and carries out to the voltage of power loop
Sampling, when signal output end A exports high level or high impedance, first switch metal-oxide-semiconductor Q1 conducting, power loop is worked normally；
When short-circuit trigger voltage is more than setting value, signal output end A level is dragged down, and first switch metal-oxide-semiconductor Q1 cut-off carries out short-circuit guarantor
Shield.
The present invention has ultrafast reaction speed, the voltage adaptation ability of superelevation, the ability for adapting to various short actions, short
The ability restored automatically and safely and effectively protection mechanism, will not interfere bypass operation after the protection of road, will not lesion element.
Preferably, the drain electrode of the first switch metal-oxide-semiconductor Q1 passes through inductance L with burr absorption circuit and connects
Vout-.Applied to DC circuit.
Preferably, the burr absorption circuit includes concatenated second resistance R2 and first capacitor C1, signal input
End B is connected on burr absorption circuit.
Under normal circumstances, load is connected between Vout+ and Vout-, power loop works normally, when Vout+ is short with Vout-
When connecing trigger voltage more than setting value, the momentary spike voltage and burr generated when burr absorption circuit is to short circuit absorbs.
Preferably, the short-circuit peak current diverting route includes the first diode in parallel with first resistor RS
DIO。
By first diode DIO to the momentary spike current distributing on first resistor RS, protect first resistor RS not by
The impact of wink peak current is blown.
The peak current and peak voltage that auxiliary circuit generates when being mainly to short circuit limit, thus protection element mistake
Do not occur spark or punch through damage when stream.
Preferably, the auxiliary circuit further includes the filter capacitor EC, Yi Jilian being connected between VIN+ and VIN-
Meet the fuse FU between VIN+ and Vout-.
Preferably, the short-circuit protection ontology circuit includes the comparator U2 that output end is connect with signal output end A,
One end connection reference voltage 5V and the 3rd resistor R3 and the 4th resistance R4 of other end ground connection after series connection, rear one end in sequential series connect
Connect signal input part B and the other end ground connection the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, and with the 6th resistance R6
Node between the normal phase input end connection 3rd resistor R3 and the 4th resistance R4 of second capacitor C2 in parallel, comparator U2, than
The node between inverting input terminal connection the 6th resistance R6 and the 7th resistance R7 compared with device U2.
Second capacitor C2 is signal sampling speed-up capacitor, and the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 are to short circuit
Trigger signal is divided, and 3rd resistor R3 and the 4th resistance R4 provide the reference voltage used for comparator.
Preferably, the short-circuit protection ontology circuit includes one end connection signal input terminal B and the other end is grounded
Signal sample circuit, and by signal sample circuit signal sampling process triggering ON/OFF switching circuit.
Preferably, the signal sample circuit includes rear one end connection signal input terminal B in sequential series and the other end
Ground connection the 8th resistance R8, the first zener diode ZD1, light emitting diode U1B and the 9th resistance R9, and with the 8th resistance R8
Third capacitor C3 in parallel；
The switching circuit includes the phototriode U1A of collector connection signal output terminals A and emitter ground connection, works as function
When rate loop works normally, a reference voltage is provided by the first zener diode ZD1 and voltage is kept to be basically unchanged, when luminous
When diode U1B ends, triggering phototriode U1A cut-off, signal output end A exports high level or high impedance；When luminous
When diode U1B is connected, triggering phototriode U1A conducting, signal output end A exports low level.
Preferably, the signal sample circuit includes rear one end connection signal input terminal B in sequential series and the other end
The tenth resistance R10, the second zener diode ZD2 and the eleventh resistor R11 of ground connection, and in parallel with the tenth resistance R10 the
Four capacitor C4；
The switching circuit includes the second switch metal-oxide-semiconductor Q2 of drain electrode connection signal output terminals A and source electrode ground connection, and second opens
The grid for closing metal-oxide-semiconductor Q2 connects the intermediate node of the second zener diode ZD2 and eleventh resistor R11.
When power loop works normally, a reference voltage is provided by the second zener diode ZD2 and keeps voltage base
This is constant, and eleventh resistor R11 is equal to ground voltage, second switch without pressure drop, the grid voltage of second switch metal-oxide-semiconductor Q2 at this time
Metal-oxide-semiconductor Q2 cut-off, at this point, signal output end A is high level or high impedance；When short-circuit trigger voltage is more than setting value, the
Two switch metal-oxide-semiconductor Q2 conductings, at this point, signal output end A is low level.
Preferably, the signal sample circuit includes rear one end connection signal input terminal B in sequential series and the other end
Twelfth resistor R12, third zener diode ZD3 and the thirteenth resistor R13 of ground connection, and it is in parallel with twelfth resistor R12
The 5th capacitor C5；
The switching circuit includes the triode Q3, triode Q3 of collector connection signal output terminals A and emitter ground connection
Base stage connection third zener diode ZD3 and thirteenth resistor R13 intermediate node.
When power loop works normally, a reference voltage is provided by third zener diode ZD3 and keeps voltage base
This is constant, and thirteenth resistor R13 is equal to ground voltage without pressure drop, the base voltage of triode Q3 at this time, and triode Q3 ends, this
When, signal output end A is high level or high impedance；When short-circuit trigger voltage is more than setting value, triode Q3 conducting, this
When, signal output end A is low level.
The invention has the benefit that
1, the present invention occur short circuit when, have ultrafast reaction speed, can short circuit occur moment immediately
Close loop switch metal-oxide-semiconductor.
2, the voltage adaptation ability of superelevation of the present invention can be executed normally short regardless of bus is 10V, 100V or 500V
Road movement, it is less too high, too wide and short-circuit function is caused to weaken or disappear with worry voltage.
3, the present invention has the ability for adapting to various short actions, either opens a way again short-circuit, or first short circuit is switched on again,
Still short circuit again is first powered on, perhaps with short circuit again or easily short circuit or heavily loaded short circuit is carried, short-circuit guarantor can be normally completed
Shield.
4, the present invention has the ability restored automatically after short-circuit protection, and short action is cancelled, and power loop or is protected
Loop can resume operation automatically again, without other interference.
5, the present invention has safely and effectively protection mechanism, has quiet nonarcing short action, regardless of female
How high line voltage is, and bus electrolyte capacity is much, can guarantee when short circuit, will not produce any spark, or strike sparks
Poop, it is very quiet and effective, it gives people a kind of huge steady and sure sense, any device will not be caused to damage and influenced,
And power loop can restore automatically after short circuit cancellation, expanded the flexibility and use scope of application significantly, no longer carried on a shoulder pole
The safety problem that various short-circuit conditions occur in heart production and when use, short circuit causes, while also allowing the better adaptive authentication of product
It is required that expanding the competitiveness of product in market.
6, the extra-high voltage current spike that generates fully absorbs when short-circuit auxiliary circuit of the invention is to protection act,
The circuit that it will not be allowed to generate extra interference and influence side is run, it is possible to lasting progress of following one's bent without restriction
Various short actions damage circuit without worrying.
Detailed description of the invention
Fig. 1 is the present invention-embodiment electrical block diagram.
Fig. 2 is the first electrical block diagram of the present invention-embodiment short-circuit protection ontology circuit.
Fig. 3 is second of electrical block diagram of the present invention-embodiment short-circuit protection ontology circuit.
Fig. 4 is the third electrical block diagram of the present invention-embodiment short-circuit protection ontology circuit.
Fig. 5 is the 4th kind of electrical block diagram of the present invention-embodiment short-circuit protection ontology circuit.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.
Embodiment:
As shown in Figure 1, the ultrahigh speed short-circuit protection circuit that one kind of the present embodiment can be restored automatically, including it is set to power ring
The ontology circuit and auxiliary circuit of road.
Ontology circuit includes the short-circuit protection ontology circuit equipped with signal input part B and signal output end A, and grid connection is short
Protect the source of the first switch metal-oxide-semiconductor Q1 and one end connection first switch metal-oxide-semiconductor Q1 of the signal output end A of ontology circuit in road
The first resistor RS of pole and other end ground connection.
Auxiliary circuit includes one end by inductance L connection Vout- and the burr absorption circuit of other end ground connection, and with the
The short-circuit peak current diverting route of one resistance RS parallel connection.
Burr absorption circuit includes concatenated second resistance R2 and first capacitor C1.
Under normal circumstances, load is connected between Vout+ and Vout-, power loop works normally, when Vout+ is short with Vout-
When connecing trigger voltage more than setting value, the momentary spike voltage and burr generated when burr absorption circuit is to short circuit absorbs,
Second resistance R2 and first capacitor C1 carries out clamper to short-circuit peak voltage.
By inductance L connection Vout-, short-circuit peak current diverting route includes and for the drain electrode of first switch metal-oxide-semiconductor Q1
The first diode DIO of one resistance RS parallel connection.
The signal input part B of short-circuit protection ontology circuit is connected on power loop, in the present embodiment, short-circuit protection sheet
Node between signal input part B the connection inductance L and second resistance R2 of body circuit samples short-circuit trigger voltage.
Short-circuit protection ontology circuit samples the voltage of power loop, when signal output end A export high level or
High impedance, first switch metal-oxide-semiconductor Q1 conducting, power loop work normally；When short-circuit trigger voltage is more than setting value, signal is defeated
Outlet A level drags down, and loop quick closedown is realized in first switch metal-oxide-semiconductor Q1 quick closedown, thus realize supper-fast protection, this
When, by first diode DIO to the momentary spike current distributing on first resistor RS, protect first resistor RS not by wink spike
Rush of current is blown.
The peak current and peak voltage that auxiliary circuit generates when being mainly to short circuit limit, thus protection element mistake
Do not occur spark or punch through damage when stream.
This short-circuit protection circuit can detect short action in a very short period of time first and immediately turn off output loop
In first switch metal-oxide-semiconductor Q1, make export electric current moment cut-off, any circuit and element will not be impacted.It is super realizing
While the short-circuit protection of high speed, it can also accomplish shortcircuit contact points without any spark and quiet；Both it is able to achieve ultra-long time
Sustained short-circuit is also able to achieve constantly short-circuit open circuit circulation, short circuit band load circulation, short circuit for a long time and plays switch cycles, and short circuit
It can restore to run well automatically after cancellation.
Auxiliary circuit further includes the filter capacitor EC being connected between VIN+ and VIN-, and is connected to VIN+ and Vout-
Between fuse FU, the present invention has the cooperation of auxiliary circuit, to reach ideal short-circuit protection effect.
It needs to select in ontology circuit with quick response and the element and circuit of switch motion can be carried out, from short-circuit protection sheet
The signal input part B sampling of body circuit by electric resistance partial pressure and trigger voltage set point, trigger voltage by enabling element, such as
The grid level of the elements such as comparator, field-effect tube, triode, phototriode, driving first switch metal-oxide-semiconductor Q1 is drawn rapidly
Low, first switch metal-oxide-semiconductor Q1 can be completely closed with prestissimo, and entire loop is nipped off, prevents electric current from circulating, thus not
Each of ring change road element can be damaged, is played a very good protection；After short-circuit trigger signal is cancelled, short-circuit protection ontology
The signal output end A of circuit can restore high level or high impedance again, and first switch metal-oxide-semiconductor Q1 conducting can be made logical, and loop is certainly
It is dynamic to restart recovery normal work.
Following four kinds of circuit structures of the present embodiment illustration short-circuit protection ontology circuit:
As shown in Fig. 2, the first: short-circuit protection ontology circuit includes the comparator that output end is connect with signal output end A
U2, one end connection reference voltage 5V and the 3rd resistor R3 and the 4th resistance R4 of other end ground connection, in sequential series latter after series connection
Hold connection signal input terminal B and the other end ground connection the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, and with the 6th electricity
Hinder the second capacitor C2 of R6 parallel connection, the section between the normal phase input end connection 3rd resistor R3 and the 4th resistance R4 of comparator U2
Point, the inverting input terminal of comparator U2 connect the node between the 6th resistance R6 and the 7th resistance R7.
Second capacitor C2 is signal sampling speed-up capacitor, and the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 are to short circuit
Trigger signal is divided, and 3rd resistor R3 and the 4th resistance R4 provide the reference voltage used for comparator.
As shown in figure 3, second: short-circuit protection ontology circuit includes collector connection signal output terminals A and emitter connects
The phototriode U1A, rear one end connection signal input terminal B in sequential series and the 8th resistance R8 of other end ground connection, first on ground
Zener diode ZD1, light emitting diode U1B and the 9th resistance R9, and the third capacitor C3 in parallel with the 8th resistance R8.
8th resistance R8 is current-limiting resistance, and third capacitor C3 is signal sampling speed-up capacitor, and the first zener diode ZD1 is
Sampled voltage setting value, phototriode U1A and light emitting diode U1B realize the transmission and isolation of signal.8th resistance R8,
One zener diode ZD1, light emitting diode U1B and the 9th resistance R9 form signal sample circuit, and phototriode U1A composition is opened
Powered-down road.
The circuit theory of above-mentioned short-circuit protection ontology circuit is:
When power loop works normally, a reference voltage is provided by the first zener diode ZD1 and keeps voltage base
This is constant, and light emitting diode U1B ends at this time, phototriode U1A cut-off, at this point, signal output end A output high level or
High impedance；When short-circuit trigger voltage is more than setting value, light emitting diode U1B conducting, and then trigger phototriode U1A and lead
It is logical, at this point, signal output end A exports low level.
As shown in figure 4, the third: short-circuit protection ontology circuit includes drain electrode with connection signal output terminals A and source electrode is grounded
Second switch metal-oxide-semiconductor Q2, it is in sequential series after one end connection signal input terminal B and the tenth resistance R10 of other end ground connection, second
Zener diode ZD2 and eleventh resistor R11, and the fourth capacitor C4 in parallel with the tenth resistance R10, second switch metal-oxide-semiconductor
The grid of Q2 connects the intermediate node of the second zener diode ZD2 and eleventh resistor R11.
Tenth resistance R10 is current-limiting resistance, and the 4th capacitor C4 is signal sampling speed-up capacitor, the second zener diode ZD2
For sampled voltage setting value, the tenth resistance R10, the second zener diode ZD2 and eleventh resistor R11 form signal sample circuit
(partial pressure), second switch metal-oxide-semiconductor Q2 composition switching circuit simultaneously execute short action according to the signal of sampling.
The circuit theory of above-mentioned short-circuit protection ontology circuit is:
When power loop works normally, a reference voltage is provided by the second zener diode ZD2 and keeps voltage base
This is constant, and eleventh resistor R11 is equal to ground voltage, second switch without pressure drop, the grid voltage of second switch metal-oxide-semiconductor Q2 at this time
Metal-oxide-semiconductor Q2 cut-off, at this point, signal output end A output high level or high impedance；When short-circuit trigger voltage is more than setting value,
Second switch metal-oxide-semiconductor Q2 conducting, at this point, signal output end A exports low level.
As shown in figure 5, the 4th kind: short-circuit protection ontology circuit includes collector and connection signal output terminals A and emitter
The triode Q3, rear one end connection signal input terminal B in sequential series of ground connection and twelfth resistor R12, the third of other end ground connection
Zener diode ZD3 and thirteenth resistor R13, and the fiveth capacitor C5 in parallel with twelfth resistor R12, the base of triode Q3
The intermediate node of pole connection third zener diode ZD3 and thirteenth resistor R13.
Twelfth resistor R12 is current-limiting resistance, and the 5th capacitor C5 is signal sampling speed-up capacitor, third zener diode
ZD3 is sampled voltage setting value, and twelfth resistor R12, third zener diode ZD3 and thirteenth resistor R13 composition signal are adopted
Sample circuit (partial pressure), triode Q3 (BJT) forms switching circuit, and executes short action according to the signal of sampling.
The circuit theory of above-mentioned short-circuit protection ontology circuit is:
When power loop works normally, a reference voltage is provided by third zener diode ZD3 and keeps voltage base
This is constant, and thirteenth resistor R13 is equal to ground voltage without pressure drop, the base voltage of triode Q3 at this time, and triode Q3 ends, this
When, signal output end A exports high level or high impedance；When short-circuit trigger voltage is more than setting value, triode Q3 conducting, this
When, signal output end A exports low level.
Above-mentioned second, the third is similar with the circuit structure of the 4th kind of short-circuit protection ontology circuit and circuit theory,
It is the characteristic and switch (phototriode U1A, second switch metal-oxide-semiconductor Q2 and triode using zener diode constant voltage
Q3 it) changes come the level of signal input part B and signal output end A when making two states (working normally and short-circuit), just
Often when work, first switch metal-oxide-semiconductor Q1 is connected by the high level or high impedance of signal output end A；When short circuit occurs, lead to
The level for crossing signal output end A, which drags down, ends first switch metal-oxide-semiconductor Q1, triggers short-circuit protection.
The present invention has ultrafast reaction speed when short circuit occurs, and can close immediately in the moment that short circuit occurs
Closed loop way switch metal-oxide-semiconductor；The voltage adaptation ability of superelevation can be executed normally short regardless of bus is 10V, 100V or 500V
Road movement, it is less too high, too wide and short-circuit function is caused to weaken or disappear with worry voltage；With the various short actions of adaptation
Ability, either open a way again short-circuit, or first short circuit is switched on again, still first power on again it is short-circuit, perhaps with carry short circuit again or
Easily short circuit or heavy duty short circuit, can normally complete short-circuit protection；With the ability restored automatically after short-circuit protection, short circuit is dynamic
Work is cancelled, and power loop or protected loop can resume operation automatically again, without other interference；And safely and effectively
Protection mechanism has quiet nonarcing short action, and regardless of how high busbar voltage is, bus electrolyte capacity is much, all
It can guarantee when short circuit, any spark, or the poop of sparking will not be produced, it is very quiet and effective, give people one
The huge having peace of mind sense of kind, will not cause any device to damage and influence, and power loop can be automatic extensive after short-circuit cancellation
It is multiple, expanded the flexibility and use scope of application significantly, no longer worry to occur when production and use various short-circuit conditions,
The safety problem that short circuit causes, while also allowing the better adaptive authentication requirement of product, expand the competitiveness of product in market.
In addition the extra-high voltage current spike that generates fully absorbs when short-circuit auxiliary circuit is to protection act, Bu Huirang
Its circuit for generating extra interference and influencing side is run, it is possible to which lasting progress of following one's bent without restriction is various short
Road movement damages circuit without worrying.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (10)
1. the ultrahigh speed short-circuit protection circuit that one kind can be restored automatically, it is characterised in that: including the ontology being set on power loop
Circuit and auxiliary circuit；
The ontology circuit includes the short-circuit protection ontology circuit equipped with signal input part B and signal output end A, grid connection letter
The of the source electrode of the first switch metal-oxide-semiconductor Q1 of number output terminals A and one end connection first switch metal-oxide-semiconductor Q1 and other end ground connection
The drain electrode of one resistance RS, first switch metal-oxide-semiconductor Q1 connect Vout-；
The auxiliary circuit include one end connection Vout- and the other end ground connection burr absorption circuit, and with first resistor RS
Short-circuit peak current diverting route in parallel；
The signal input part B of the short-circuit protection ontology circuit is connected on power loop and adopts to the voltage of power loop
Sample, when signal output end A exports high level or high impedance, first switch metal-oxide-semiconductor Q1 conducting, power loop is worked normally；When
When short-circuit trigger voltage is more than setting value, signal output end A level is dragged down, and first switch metal-oxide-semiconductor Q1 cut-off carries out short-circuit guarantor
Shield.
2. the ultrahigh speed short-circuit protection circuit that one kind according to claim 1 can be restored automatically, it is characterised in that: described
The drain electrode of one switch metal-oxide-semiconductor Q1 passes through inductance L with burr absorption circuit and connects Vout-.
3. the ultrahigh speed short-circuit protection circuit that one kind according to claim 1 can be restored automatically, it is characterised in that: the hair
Piercing absorption circuit includes concatenated second resistance R2 and first capacitor C1, and signal input part B is connected on burr absorption circuit.
4. the ultrahigh speed short-circuit protection circuit that one kind according to claim 1 can be restored automatically, it is characterised in that: described short
Road peak current diverting route includes the first diode DIO in parallel with first resistor RS.
5. the ultrahigh speed short-circuit protection circuit that one kind according to any one of claims 1-4 can be restored automatically, feature
Be: the auxiliary circuit further includes the filter capacitor EC being connected between VIN+ and VIN-, and is connected to VIN+ and Vout-
Between fuse FU.
6. the ultrahigh speed short-circuit protection circuit that one kind according to any one of claims 1-4 can be restored automatically, feature
Be: the short-circuit protection ontology circuit includes the comparator U2 that output end is connect with signal output end A, and one end connects after series connection
Reference voltage 5V and the 3rd resistor R3 and the 4th resistance R4 of other end ground connection, rear one end connection signal input terminal B in sequential series
And the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 of other end ground connection, and second electricity in parallel with the 6th resistance R6
Hold C2, the node between the normal phase input end connection 3rd resistor R3 and the 4th resistance R4 of comparator U2, the reverse phase of comparator U2
Input terminal connects the node between the 6th resistance R6 and the 7th resistance R7.
7. the ultrahigh speed short-circuit protection circuit that one kind according to any one of claims 1-4 can be restored automatically, feature
Be: the short-circuit protection ontology circuit includes the signal sample circuit of one end connection signal input terminal B and other end ground connection, with
And the switching circuit of ON/OFF is triggered in the process of signal sampling by signal sample circuit.
8. the ultrahigh speed short-circuit protection circuit that one kind according to claim 7 can be restored automatically, it is characterised in that: the letter
Number sample circuit include it is in sequential series after one end connection signal input terminal B and the 8th resistance R8 of other end ground connection, the first pressure stabilizing
Diode ZD1, light emitting diode U1B and the 9th resistance R9, and the third capacitor C3 in parallel with the 8th resistance R8；
The switching circuit includes the phototriode U1A of collector connection signal output terminals A and emitter ground connection, when luminous two
When pole pipe U1B ends, triggering phototriode U1A cut-off, signal output end A exports high level or high impedance；When luminous two
When pole pipe U1B is connected, triggering phototriode U1A conducting, signal output end A exports low level.
9. the ultrahigh speed short-circuit protection circuit that one kind according to claim 7 can be restored automatically, it is characterised in that: the letter
Number sample circuit include it is in sequential series after one end connection signal input terminal B and the tenth resistance R10 of other end ground connection, the second pressure stabilizing
Diode ZD2 and eleventh resistor R11, and the fourth capacitor C4 in parallel with the tenth resistance R10；
The switching circuit includes the second switch metal-oxide-semiconductor Q2 of drain electrode connection signal output terminals A and source electrode ground connection, second switch
The grid of metal-oxide-semiconductor Q2 connects the intermediate node of the second zener diode ZD2 and eleventh resistor R11.
10. the ultrahigh speed short-circuit protection circuit that one kind according to claim 7 can be restored automatically, it is characterised in that: described
Signal sample circuit includes twelfth resistor R12, the third of rear one end connection signal input terminal B in sequential series and other end ground connection
Zener diode ZD3 and thirteenth resistor R13, and the fiveth capacitor C5 in parallel with twelfth resistor R12；
The switching circuit includes the triode Q3 of collector connection signal output terminals A and emitter ground connection, the base of triode Q3
The intermediate node of pole connection third zener diode ZD3 and thirteenth resistor R13.
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| CN201811326376.6A CN109301794A (en) | 2018-11-08 | 2018-11-08 | A kind of ultrahigh speed short-circuit protection circuit that can restore automatically |
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| CN201811326376.6A CN109301794A (en) | 2018-11-08 | 2018-11-08 | A kind of ultrahigh speed short-circuit protection circuit that can restore automatically |
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| CN102780199A (en) * | 2011-05-13 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overcurrent protection circuit and lamp |
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| CN107947107A (en) * | 2017-12-12 | 2018-04-20 | 北京新雷能科技股份有限公司 | A kind of short-circuit protection circuit with current-limiting function |
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| US5550701A (en) * | 1994-08-30 | 1996-08-27 | International Rectifier Corporation | Power MOSFET with overcurrent and over-temperature protection and control circuit decoupled from body diode |
| CN102780199A (en) * | 2011-05-13 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overcurrent protection circuit and lamp |
| CN106505513A (en) * | 2016-12-26 | 2017-03-15 | 广东工业大学 | A kind of LED drive power and its outfan short-circuit protection circuit |
| CN107947107A (en) * | 2017-12-12 | 2018-04-20 | 北京新雷能科技股份有限公司 | A kind of short-circuit protection circuit with current-limiting function |
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Application publication date: 20190201 |