CN206379719U - Overcurrent protection peripheral circuit and electrical equipment - Google Patents
Overcurrent protection peripheral circuit and electrical equipment Download PDFInfo
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- CN206379719U CN206379719U CN201621276816.8U CN201621276816U CN206379719U CN 206379719 U CN206379719 U CN 206379719U CN 201621276816 U CN201621276816 U CN 201621276816U CN 206379719 U CN206379719 U CN 206379719U
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Abstract
The utility model provides a kind of overcurrent protection peripheral circuit and electrical equipment, wherein, overcurrent protection peripheral circuit includes：Processor；Referrer module also includes：Switch element, the drive end of switch element is connected to processor, when processor is to drive end output Continuity signal, switching elements conductive, now the output end of referrer module export the first partial pressure value as reference signal to the second input, processor to drive end export cut-off signals when, switch element is turned off, now the output end of referrer module exports the second partial pressure value as reference signal to the second input, wherein, the first partial pressure value and the second partial pressure value are unequal.By the technical solution of the utility model there is provided the reliable reference signal of plurality of stable, with suitable for different load equipment and work condition environment, meanwhile, improve the reliability and accuracy of overcurrent protection.
Description
Technical field
The utility model is related to field of circuit technology, in particular to a kind of overcurrent protection peripheral circuit and a kind of use
Electric equipment.
Background technology
Power chip especially smart power chip (Intelligent Power Module, abbreviation IPM) is with its corpusculum
Product, load current be big and is widely used in the drive control circuit of large-scale electric equipment the advantages of fast response time, in order to
Ensure the reliability of power chip, protection circuit generally is set in its periphery, is mainly used for the effect of current-limiting protection.
In correlation technique, as shown in figure 1, the current foldback circuit of power chip includes being sequentially connected in series in load sampling
Hold between (the P+ ends in sampling module 102) and overcurrent protection module (being connected to the overcurrent protection module inside power chip)
Noninductive resistance R1 ' and low-pass filtering module 104 (resistance R2 ' and electric capacity C ' shown in Fig. 1), noninductive resistance R1 ' voltages pass through
The low-pass filtering module 104 of resistance R2 ' and electric capacity C ' compositions is input to overcurrent protection module (the overcurrent protection end of inside modules
Mouthful).
Wherein, when such as compressor, motor, engine equipment are as load, specifically device type and work condition environment
Deng an Anisotropic parameter, the excessively stream higher limit of load can be all influenceed, such as compressor includes rare earth compressor and ferrite compressor,
Rare earth compressor possesses that efficiency is high, demagnetization current is big and high reliability, and the production cost of ferrite compressor is low.
In addition, even if same equipment is under different working temperatures, excessively stream higher limit is also differed, for example, excessively stream during high temperature
Higher limit needs to set relatively low, and excessively stream higher limit needs to set higher during low temperature.
Therefore, different types of equipment carries out overcurrent protection using same current foldback circuit and same reference signal, or
Same equipment carries out overcurrent protection under different duty parameters using same current foldback circuit and same reference signal, can
Influence the accuracy and reliability of overcurrent protection.
Utility model content
The utility model is intended at least solve one of technical problem present in prior art or correlation technique.
Therefore, a purpose of the present utility model is to propose a kind of overcurrent protection peripheral circuit.
Another purpose of the present utility model is to propose a kind of electrical equipment.
To achieve the above object, according to the embodiment of first aspect of the present utility model, it is proposed that outside a kind of overcurrent protection
Circuit is enclosed, including：Processor；Referrer module also includes：Switch element, the drive end of switch element is connected to processor, processing
Device to drive end export Continuity signal when, switching elements conductive, now the output end of referrer module is to the second input output the
One partial pressure value as reference signal, processor to drive end export cut-off signals when, switch element shut-off, now referrer module
Output end exports the second partial pressure value as reference signal to the second input, wherein, the first partial pressure value and the second partial pressure value not phase
Deng.
According to the overcurrent protection peripheral circuit of embodiment of the present utility model, it is adaptable to power chip, power chip it is interior
Portion is provided with overcurrent protection module, and overcurrent protection peripheral circuit is provided with referrer module and comparison module, the first input of comparison module
End is connected to load sampling end to obtain sampled signal, the second input of comparison module be connected to the output end of referrer module with
Reference signal is obtained, when comparison module judges that sampled signal is more than or equal to reference signal, comparison module is to overcurrent protection mould
Block exports trigger signal, to trigger overcurrent protection module work, by setting switch element in referrer module, passes through processor
The on or off of controlling switch element provides different reference signals (the first partial pressure value or the second partial pressure value), with suitable for
Different load equipments and/or duty parameter.
Wherein, the Continuity signal or cut-off signals of processor generation are to depend on the equipment class that user writes within a processor
Shape parameter and/or the duty parameter of sensor collection, because switch element typically uses triode, transistor or metal-oxide-semiconductor etc., its
Electric conduction is forced down, therefore, passes through the conducting and closing of controlling switch element, thus it is possible to vary the voltage situation of referrer module,
Therefore, the reference signal of the output end of referrer module changes with the on or off of switch element, to provide different ginsengs
Signal is examined, and then suitable for the overcurrent protection of different types of equipment (load), similarly, is also applied for different open parameters
Under overcurrent protection.
In addition, by setting referrer module and comparison module in overcurrent protection peripheral circuit, judging negative in comparison module
When the input signal for carrying sampling end is more than or equal to the comparative result of reference signal, comparison module is exported to overcurrent protection module and touched
Signal, worked with triggering the overcurrent protection module of inside of power chip.
According to the overcurrent protection peripheral circuit of above-described embodiment of the present utility model, there can also be following technical characteristic：
According to one embodiment of the present utility model, referrer module also includes：Multiple resistive elements, are connected in series in reference
Between power supply and ground wire, one end of a specific electrical resistance element in multiple resistive elements as referrer module output end, its
In, switch element is connected in parallel to specific electrical resistance element, during switching elements conductive, and specific electrical resistance element is short-circuited, switch element
During shut-off, specific electrical resistance element conductive.
In this embodiment, by setting switch element to be connected in parallel to specific electrical resistance element, and the drive of switch element
Moved end is controlled by processor, during switching elements conductive, and specific electrical resistance element is short-circuited, and switch element turns into one in referrer module
Individual sectional pressure element, when switch element is turned off, specific electrical resistance element conductive, specific electrical resistance element turns into one point in referrer module
Press element.
Wherein, the conducting voltage of switch element is generally 0.7V or so, and its conducting resistance is far below resistive element, so that
Specific electrical resistance element is obtained to be short-circuited.
According to one embodiment of the present utility model, comparison module includes：Comparator, two inputs difference of comparator
The output end of load sampling end and referrer module is connected to, the output end of comparator is connected to the base stage of triode；Triode, three
The colelctor electrode of pole pipe is connected to DC source, and the emitter stage of triode is connected to first resistor；First resistor, the first of first resistor
End is connected to the emitter stage of triode, and the second end ground connection of first resistor, the first end of first resistor is additionally coupled to excessively stream guarantor
Module is protected, wherein, when sampled signal is more than or equal to reference signal, the output end of comparator exports base stage to the base stage of triode
Drive signal, with turn-on transistor, the load voltage of first resistor is exported to overcurrent protection module as trigger signal.
In this embodiment, by setting comparison module to include comparator and triode, and connect through the above way, i.e.,
The input signal of load sampling end is fluctuated, fixed trigger signal can be exported by comparator, rather than with input
The fluctuation of signal and false triggering overcurrent protection module works, and then it is reliable in complete machine running to improve power chip
Property.
In the prior art, the operation voltage of overcurrent protection module is generally 0.45 to 0.55V, if with 20m Ω without electrification
Resistance, then protective current is in 22.5A to 27.5A, and current protection error is larger, and especially phase current is in the side of current protection value
Edge, this has a strong impact on the reliability during operation of IPM complete machines.
The application joins with directly exporting sampled signal to compared with the technical scheme of overcurrent protection module in the prior art
Examining signal, (" fixation " herein refers to constant during overcurrent protection, however it is not limited to set adjustable for fixed telecommunication number value
Element sets reference signal), rather than a floating scope, load the input signal and a fixed telecommunication number of sampling end
Value compares, and an overcurrent protection threshold value is provided with equivalent to by comparison module, load sampling end input signal be more than or
During equal to this overcurrent protection threshold value, comparison module exports a corresponding trigger signal, and (generally output " 1 " is used as high level
Trigger signal), overcurrent protection module is when detecting " 1 " signal, and the filtering protection module inside power chip is started working.
According to one embodiment of the present utility model, in addition to：Triode is NPN type triode or PNP type triode.
According to one embodiment of the present utility model, when triode is PNP type triode, the negative input of comparator is made
Load sampling end is connected to for first input end, and the electrode input end of comparator is connected to referrer module as the second input
Output end, wherein, when sampled signal is more than or equal to reference signal, comparator output low level signal, it is low that comparator is exported
Level is exported to the base stage of PNP type triode with turn-on transistor as base drive signal, and the load voltage of first resistor is
High level signal, and exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports low level signal,
The low level of comparator output is exported to the base stage of PNP type triode with turn-on transistor, the first electricity as base drive signal
The load voltage of resistance is high level signal, and is exported as trigger signal to overcurrent protection module, improves power chip and exists
Reliability in complete machine running.
According to one embodiment of the present utility model, when triode is NPN type triode, the electrode input end of comparator is made
Load sampling end is connected to for first input end, and the negative input of comparator is connected to referrer module as the second input
Output end, wherein, when sampled signal is more than or equal to reference signal, comparator output high level signal, the height of comparator output
Level is exported to the base stage of NPN type triode with turn-on transistor as base drive signal, and the load voltage of first resistor is
High level signal, and exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports high level signal,
The high level of comparator output is exported to the base stage of NPN type triode with turn-on transistor, the first electricity as base drive signal
The load voltage of resistance is high level signal, and is exported as trigger signal to overcurrent protection module, improves power chip and exists
Reliability in complete machine running.
According to one embodiment of the present utility model, in addition to：Comparator, two inputs of comparator are respectively connecting to
The output end of sampling end and referrer module is loaded, the output end of comparator is connected to the grid of metal-oxide-semiconductor；Metal-oxide-semiconductor, the source of metal-oxide-semiconductor
Pole is connected to DC source, and the drain electrode of metal-oxide-semiconductor is connected to first resistor；First resistor, the first end of first resistor is connected to metal-oxide-semiconductor
Drain electrode, the second end ground connection of first resistor, the first end of first resistor is additionally coupled to overcurrent protection module, wherein, sampling letter
When number being more than or equal to reference signal, the output end of comparator exports gate drive signal to the grid of metal-oxide-semiconductor, to turn on MOS
Pipe, the load voltage of first resistor is exported to overcurrent protection module as trigger signal.
In this embodiment, by setting comparison module to include comparator and metal-oxide-semiconductor, and connect through the above way, i.e.,
The input signal of load sampling end is fluctuated, fixed trigger signal can be exported by comparator, rather than with input
The fluctuation of signal and false triggering overcurrent protection module works, and then it is reliable in complete machine running to improve power chip
Property.
In the prior art, the operation voltage of overcurrent protection module is generally 0.45 to 0.55V, if with 20m Ω without electrification
Resistance, then protective current is in 22.5A to 27.5A, and current protection error is larger, and especially phase current is in the side of current protection value
Edge, this has a strong impact on the reliability during operation of IPM complete machines.
The application joins with directly exporting sampled signal to compared with the technical scheme of overcurrent protection module in the prior art
Examining signal, (" fixation " herein refers to constant during overcurrent protection, however it is not limited to set adjustable for fixed telecommunication number value
Element sets reference signal), rather than a floating scope, load the input signal and a fixed telecommunication number of sampling end
Value compares, and an overcurrent protection threshold value is provided with equivalent to by comparison module, load sampling end input signal be more than or
During equal to this overcurrent protection threshold value, comparison module exports a corresponding trigger signal, and (generally output " 1 " is used as high level
Trigger signal), overcurrent protection module is when detecting " 1 " signal, and the filtering protection module inside power chip is started working.
According to one embodiment of the present utility model, metal-oxide-semiconductor is P-channel metal-oxide-semiconductor or N-channel MOS pipe.
According to one embodiment of the present utility model, when metal-oxide-semiconductor is N-channel MOS pipe, the negative input conduct of comparator
First input end is connected to load sampling end, and the electrode input end of comparator is connected to the defeated of referrer module as the second input
Go out end, wherein, when sampled signal is more than or equal to reference signal, comparator output low level signal, the low electricity of comparator output
Flat to be exported as gate drive signal to the grid of N-channel MOS pipe to turn on metal-oxide-semiconductor, the load voltage of first resistor is high electricity
Ordinary mail number, and exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports low level signal,
The low level of comparator output exports to the grid of N-channel MOS pipe to turn on metal-oxide-semiconductor, first resistor as gate drive signal
Load voltage be high level signal, and exported as trigger signal to overcurrent protection module, improve power chip whole
Reliability in machine running.
According to one embodiment of the present utility model, when metal-oxide-semiconductor is P-channel metal-oxide-semiconductor, the electrode input end conduct of comparator
First input end is connected to load sampling end, and the negative input of comparator is connected to the defeated of referrer module as the second input
Go out end, wherein, when sampled signal is more than or equal to reference signal, comparator output high level signal, the height electricity of comparator output
Flat to be exported as gate drive signal to the grid of P-channel metal-oxide-semiconductor to turn on metal-oxide-semiconductor, the load voltage of first resistor is high electricity
Ordinary mail number, and exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports high level signal,
The high level of comparator output exports to the grid of P-channel metal-oxide-semiconductor to turn on metal-oxide-semiconductor, first resistor as gate drive signal
Load voltage be high level signal, and exported as trigger signal to overcurrent protection module, improve power chip whole
Reliability in machine running.
According to one embodiment of the present utility model, in addition to：Filtration module, is connected to load sampling end and comparison module
First input end between, for filter out load sampling end sampled signal in AC signal.
In this embodiment, by by filtration module be connected to load sampling end and comparison module first input end it
Between, the AC signal in sampled signal is filtered out, AC signal includes but is not limited to surge pulse signal, white noise signal, shot
Noise signal and thermal noise signal etc..
According to one embodiment of the present utility model, when switch element is NPN type triode or PNP type triode, switch
The drive end of element is base stage.
According to one embodiment of the present utility model, when switch element is P-channel metal-oxide-semiconductor or N-channel MOS pipe, switch member
The drive end of part is grid.
Electrical equipment described in the utility model second aspect embodiment, includes any reality of the utility model first aspect
The overcurrent protection peripheral circuit described in example is applied, therefore the server apparatus has outside the overcurrent protection described in any of the above-described embodiment
Whole beneficial effects of circuit are enclosed, be will not be repeated here.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Fig. 1 shows the schematic diagram of the current foldback circuit in correlation technique；
Fig. 2 shows the schematic diagram of the overcurrent protection peripheral circuit according to one embodiment of the present utility model；
Fig. 3 shows the schematic diagram of the overcurrent protection peripheral circuit according to another embodiment of the present utility model.
Embodiment
In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool
The utility model is further described in detail body embodiment.It should be noted that in the case where not conflicting, this Shen
The feature in embodiment and embodiment please can be mutually combined.
Many details are elaborated in the following description to fully understand the utility model, still, this practicality
New to be different from other modes described here to implement using other, therefore, protection domain of the present utility model is simultaneously
Do not limited by following public specific embodiment.
Fig. 2 shows the schematic diagram of the overcurrent protection peripheral circuit according to one embodiment of the present utility model.
Fig. 3 shows the schematic diagram of the overcurrent protection peripheral circuit according to another embodiment of the present utility model.
Specific implementation with reference to Fig. 2 and Fig. 3 to the overcurrent protection peripheral circuit according to embodiment of the present utility model
Mode is illustrated.
Embodiment one：
As shown in Fig. 2 according to the overcurrent protection peripheral circuit of embodiment of the present utility model, including：Processor MCU；Ginseng
Examining module 204 also includes：Switch element, the drive end of switch element is connected to processor MCU, and processor MCU is defeated to drive end
When going out Continuity signal, switching elements conductive, now the output end of referrer module 204 to the second input export the first partial pressure value make
For reference signal, when processor MCU is to drive end output cut-off signals, switch element shut-off, the now output of referrer module 204
Hold to the second input and export the second partial pressure value as reference signal, wherein, the first partial pressure value and the second partial pressure value are unequal.
According to the overcurrent protection peripheral circuit of embodiment of the present utility model, it is adaptable to power chip IPM, power chip
IPM inside is provided with overcurrent protection module, the corresponding interface of overcurrent protection module can for power chip IPM ITRIP ends or
PFC (Power Factor Correction, power factor correcting) is held, and the trigger signal of comparison module is obtained in above-mentioned interface
When, above-mentioned overcurrent protection module work.
In addition, overcurrent protection peripheral circuit is provided with referrer module 204 and comparison module 206, the first of comparison module 206 is defeated
Enter end and be connected to load sampling end 202 to obtain sampled signal, the second input of comparison module 206 is connected to referrer module
204 output end, when comparison module 206 judges that sampled signal is more than or equal to reference signal, is compared with obtaining reference signal
Module 206 exports trigger signal to overcurrent protection module, to trigger overcurrent protection module work, by referrer module 204
Switch element is set, (first point of different reference signals are provided by the on or off of processor MCU controlling switch elements
Pressure value or the second partial pressure value), with suitable for different load equipment P+ or duty parameter.
Wherein, the Continuity signal or cut-off signals of processor MCU generations write depending on user in processor MCU
Device type parameter and/or the duty parameter of sensor collection, because switch element typically uses triode T, transistor or MOS
Pipe M etc., its electric conduction is forced down, therefore, passes through the conducting and closing of controlling switch element, thus it is possible to vary the electricity of referrer module 204
Partial pressure situation is pressed, therefore, the reference signal of the output end of referrer module 204 changes with the on or off of switch element,
To provide different reference signals, and then suitable for different types of load equipment P+ overcurrent protection, similarly, it is also applied for
Overcurrent protection under different open parameters.
Embodiment two：
As shown in figure 3, on the basis of above-described embodiment one, the comparator C1 in comparison module is judging to load sampling end
When 202 sampled signal is more than or equal to reference signal, high level signal is exported, switch element can also be another comparator
C2, comparator C2 positive input terminal obtains the signal that high level signal is higher than negative input end, now, comparator C2 output end to
The overcurrent protection module input high level signal of processor is used as trigger signal.
In addition, by setting referrer module 204 and comparison module 206 in overcurrent protection peripheral circuit, in comparison module
206 when judging that the input signals of load sampling ends 202 is more than or equal to the comparative result of reference signal, and comparison module 206 is to mistake
Protection module output trigger signal is flowed, is worked with triggering the power chip IPM overcurrent protection module of inside.
On the basis of above-described embodiment one and embodiment two, according to the overcurrent protection of above-described embodiment of the present utility model
Peripheral circuit, can also have following technical characteristic：
According to one embodiment of the present utility model, referrer module 204 also includes：Multiple resistive elements, are connected in series in
Between reference power source and ground wire, one end of a specific electrical resistance element R0 in multiple resistive elements is used as referrer module 204
Output end, wherein, switch element is connected in parallel to specific electrical resistance element R0, during switching elements conductive, specific electrical resistance element R0 quilts
Short circuit, when switch element is turned off, specific electrical resistance element R0 conductings.
In this embodiment, it is connected in parallel to specific electrical resistance element R0 by setting switch element, and switch element
Drive end is controlled by processor MCU, during switching elements conductive, and specific electrical resistance element R0 is short-circuited, and switch element, which turns into, refers to mould
A sectional pressure element in block 204, when switch element is turned off, specific electrical resistance element R0 conductings, specific electrical resistance element R0 turns into ginseng
Examine a sectional pressure element in module 204.
Wherein, the conducting voltage of switch element is generally 0.7V or so, and its conducting resistance is far below resistive element, so that
Specific electrical resistance element R0 is obtained to be short-circuited.
Embodiment 1：
According to one embodiment of the present utility model, comparison module 206 includes：Comparator, two inputs of comparator
It is respectively connecting to load the output end of sampling end 202 and referrer module 204, the output end of comparator is connected to triode T base
Pole b；Triode T, triode T colelctor electrode c are connected to DC source, and triode T emitter e pole is connected to first resistor
R1R1；First resistor R1R1, first resistor R1R1 first end are connected to triode T emitter e pole, first resistor R1R1
The second end ground connection, first resistor R1R1 first end is additionally coupled to overcurrent protection module, wherein, sampled signal is more than or equal to
During reference signal, the output end of comparator exports base stage b drive signals to triode T base stage b, with turn-on transistor T, first
Resistance R1R1 load voltage is exported to overcurrent protection module as trigger signal.
In this embodiment, by setting comparison module 206 to include comparator and triode T, and connect through the above way
Connect, even if the input signal of load sampling end 202 is fluctuated, fixed trigger signal can be exported by comparator, without
It is fluctuation with input signal and false triggering overcurrent protection module works, and then improves power chip IPM to run in complete machine
Reliability in journey.
In the prior art, the operation voltage of overcurrent protection module is generally 0.45 to 0.55V, if with 20m Ω without electrification
Resistance, then protective current is in 22.5A to 27.5A, and current protection error is larger, and especially phase current is in the side of current protection value
Edge, this has a strong impact on the reliability during operation of IPM complete machines.
The application joins with directly exporting sampled signal to compared with the technical scheme of overcurrent protection module in the prior art
Examining signal, (" fixation " herein refers to constant during overcurrent protection, however it is not limited to set adjustable for fixed telecommunication number value
Element sets reference signal), rather than a floating scope, load the input signal and a fixed electricity of sampling end 202
Signal value compares, and an overcurrent protection threshold value is provided with equivalent to by comparison module 206, in the input of load sampling end 202
When signal is more than or equal to this overcurrent protection threshold value, comparison module 206 exports a corresponding trigger signal (generally output
" 1 " as high level trigger signal), overcurrent protection module is when detecting " 1 " signal, the filtering inside power chip IPM
Protection module is started working.
According to one embodiment of the present utility model, in addition to：Triode T is NPN type triode T or PNP type triode
T。
On the basis of embodiment one and embodiment two, comparison module at least includes implementation below：
Embodiment 1.1：
According to one embodiment of the present utility model, when triode T is PNP type triode T, the negative input of comparator
Load sampling end 202 is connected to as first input end, the electrode input end of comparator is connected to reference as the second input
The output end of module 204, wherein, when sampled signal is more than or equal to reference signal, comparator output low level signal, comparator
The low level of output exports the base stage b to PNP type triode T with turn-on transistor T, first resistor as base stage b drive signals
R1R1 load voltage is high level signal, and is exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports low level signal,
The low level of comparator output is exported to PNP type triode T base stage b with turn-on transistor T as base stage b drive signals, the
One resistance R1R1 load voltage is high level signal, and is exported as trigger signal to overcurrent protection module, improves work(
Reliabilities of the rate chip I PM in complete machine running.
Embodiment 1.2：
According to one embodiment of the present utility model, when triode T is NPN type triode T, the electrode input end of comparator
Load sampling end 202 is connected to as first input end, the negative input of comparator is connected to reference as the second input
The output end of module 204, wherein, when sampled signal is more than or equal to reference signal, comparator output high level signal, comparator
The high level of output exports the base stage b to NPN type triode T with turn-on transistor T, first resistor as base stage b drive signals
R1R1 load voltage is high level signal, and is exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports high level signal,
The high level of comparator output is exported to NPN type triode T base stage b with turn-on transistor T as base stage b drive signals, the
One resistance R1R1 load voltage is high level signal, and is exported as trigger signal to overcurrent protection module, improves work(
Reliabilities of the rate chip I PM in complete machine running.
Embodiment 2：
According to one embodiment of the present utility model, in addition to：Comparator, two inputs of comparator are respectively connecting to
The output end of sampling end 202 and referrer module 204 is loaded, the output end of comparator is connected to metal-oxide-semiconductor M grid；Metal-oxide-semiconductor M,
Metal-oxide-semiconductor M source electrode is connected to DC source, and metal-oxide-semiconductor M drain electrode is connected to first resistor R1R1；First resistor R1R1, first resistor
R1 first end is connected to metal-oxide-semiconductor M drain electrode, and first resistor R1 the second end ground connection, first resistor R1 first end is also connected with
To overcurrent protection module, wherein, when sampled signal is more than or equal to reference signal, grid from the output end of comparator to metal-oxide-semiconductor M
Gate drive signal is exported, to turn on metal-oxide-semiconductor M, first resistor R1 load voltage is exported to overcurrent protection as trigger signal
Module.
In this embodiment, by setting comparison module 206 to include comparator and metal-oxide-semiconductor M, and connect through the above way
Connect, even if the input signal of load sampling end 202 is fluctuated, fixed trigger signal can be exported by comparator, without
It is fluctuation with input signal and false triggering overcurrent protection module works, and then improves power chip IPM to run in complete machine
Reliability in journey.
Wherein, DC source includes but is not limited to a high level signal of direct-flow voltage regulation source or processor output.
In the prior art, the operation voltage of overcurrent protection module is generally 0.45 to 0.55V, if with 20m Ω without electrification
Resistance, then protective current is in 22.5A to 27.5A, and current protection error is larger, and especially phase current is in the side of current protection value
Edge, this has a strong impact on the reliability during operation of IPM complete machines.
The application joins with directly exporting sampled signal to compared with the technical scheme of overcurrent protection module in the prior art
Examining signal, (" fixation " herein refers to constant during overcurrent protection, however it is not limited to set adjustable for fixed telecommunication number value
Element sets reference signal), rather than a floating scope, load the input signal and a fixed electricity of sampling end 202
Signal value compares, and an overcurrent protection threshold value is provided with equivalent to by comparison module 206, in the input of load sampling end 202
When signal is more than or equal to this overcurrent protection threshold value, comparison module 206 exports a corresponding trigger signal (generally output
" 1 " as high level trigger signal), overcurrent protection module is when detecting " 1 " signal, the filtering inside power chip IPM
Protection module is started working.
According to one embodiment of the present utility model, metal-oxide-semiconductor M is P-channel metal-oxide-semiconductor M or N-channel MOS pipe M.
Embodiment 2.1：
According to one embodiment of the present utility model, when metal-oxide-semiconductor M is N-channel MOS pipe M, the negative input of comparator is made
Load sampling end 202 is connected to for first input end, the electrode input end of comparator is connected to as the second input refers to mould
The output end of block 204, wherein, when sampled signal is more than or equal to reference signal, comparator output low level signal, comparator is defeated
The low level gone out is exported to N-channel MOS pipe M grid as gate drive signal to turn on metal-oxide-semiconductor M, and first resistor R1's is negative
Load voltage is high level signal, and is exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports low level signal,
The low level of comparator output exports to N-channel MOS pipe M grid to turn on metal-oxide-semiconductor M, the first electricity as gate drive signal
The load voltage for hindering R1 is high level signal, and is exported as trigger signal to overcurrent protection module, improves power chip
Reliabilities of the IPM in complete machine running.
Embodiment 2.2：
According to one embodiment of the present utility model, when metal-oxide-semiconductor M is P-channel metal-oxide-semiconductor M, the electrode input end of comparator is made
Load sampling end 202 is connected to for first input end, the negative input of comparator is connected to as the second input refers to mould
The output end of block 204, wherein, when sampled signal is more than or equal to reference signal, comparator output high level signal, comparator is defeated
The high level gone out is exported to P-channel metal-oxide-semiconductor M grid as gate drive signal to turn on metal-oxide-semiconductor M, and first resistor R1's is negative
Load voltage is high level signal, and is exported as trigger signal to overcurrent protection module.
In this embodiment, by the way that when sampled signal is more than or equal to reference signal, comparator exports high level signal,
The high level of comparator output exports to P-channel metal-oxide-semiconductor M grid to turn on metal-oxide-semiconductor M, the first electricity as gate drive signal
The load voltage for hindering R1 is high level signal, and is exported as trigger signal to overcurrent protection module, improves power chip
Reliabilities of the IPM in complete machine running.
According to one embodiment of the present utility model, in addition to：Filtration module 208, is connected to load sampling end 202 and ratio
Between first input end compared with module 206, the AC signal in sampled signal for filtering out load sampling end 202.
In this embodiment, by the way that filtration module 208 is connected into the first of load sampling end 202 and comparison module 206
Between input, the AC signal in sampled signal is filtered out, AC signal includes but is not limited to surge pulse signal, white noise letter
Number, shot noise signal and thermal noise signal etc..
As shown in Fig. 2 the embodiment of filtration module 208 is generally the second resistance R2 and electric capacity C being connected in series.
According to one embodiment of the present utility model, when switch element is NPN type triode T or PNP type triode T, open
The drive end for closing element is base stage b.
According to one embodiment of the present utility model, when switch element is P-channel metal-oxide-semiconductor M or N-channel MOS pipe M, switch
The drive end of element is grid.
The technical solution of the utility model is described in detail above in association with accompanying drawing, the utility model proposes a kind of new mistake
Stream protection peripheral circuit, by setting switch element in referrer module, conducting or pass by processor controlling switch element
Break to provide different reference signals (the first partial pressure value or the second partial pressure value), with suitable for different load equipment and/or work
Condition parameter.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (12)
1. a kind of overcurrent protection peripheral circuit, it is adaptable to power chip, the inside of the power chip is provided with overcurrent protection module,
The overcurrent protection peripheral circuit is provided with referrer module and comparison module, and the first input end of the comparison module is connected to load
Sampling end is to obtain sampled signal, and the second input of the comparison module is connected to the output end of the referrer module to obtain
The reference signal, when the comparison module judges that the sampled signal is more than or equal to the reference signal, the comparison
Module exports trigger signal to the overcurrent protection module, is worked with triggering the overcurrent protection module, it is characterised in that described
Overcurrent protection peripheral circuit also includes：
Processor；
The referrer module also includes：
Switch element, the drive end of the switch element is connected to the processor, and the processor is exported to the drive end
During Continuity signal, the switching elements conductive, now the output end of the referrer module to second input export first
Partial pressure value is as the reference signal, when the processor is to drive end output cut-off signals, the switch element shut-off,
Now the output end of the referrer module exports the second partial pressure value as the reference signal to second input,
Wherein, first partial pressure value and second partial pressure value are unequal.
2. overcurrent protection peripheral circuit according to claim 1, it is characterised in that the referrer module also includes：
Multiple resistive elements, are connected in series between reference power source and ground wire, the specific electricity of in the multiple resistive element
One end of resistance element as the referrer module output end,
Wherein, the switch element is connected in parallel to the specific electrical resistance element, during the switching elements conductive, the specific electricity
Resistance element is short-circuited, during the switch element shut-off, the specific electrical resistance element conductive.
3. overcurrent protection peripheral circuit according to claim 1, it is characterised in that the comparison module includes：
Comparator, two inputs of the comparator are respectively connecting to the output of the load sampling end and the referrer module
End, the output end of the comparator is connected to the base stage of triode；
The triode, the colelctor electrode of the triode is connected to reference power source, and the emitter stage of the triode is connected to first
Resistance；
The first resistor, the first end of the first resistor is connected to the emitter stage of the triode, the first resistor
The second end ground connection, the first end of the first resistor is additionally coupled to the overcurrent protection module,
Wherein, when the sampled signal is more than or equal to the reference signal, the output end of the comparator is to the triode
Base stage output base drive signal, to turn on the triode, the load voltage of the first resistor is used as the triggering letter
Number output is to the overcurrent protection module.
4. overcurrent protection peripheral circuit according to claim 3, it is characterised in that
When the triode is PNP type triode, the negative input of the comparator is connected to as the first input end
The load sampling end, the electrode input end of the comparator is connected to the defeated of the referrer module as second input
Go out end,
Wherein, when the sampled signal is more than or equal to the reference signal, the comparator exports low level signal, the ratio
The low level exported compared with device is exported to the base stage of the PNP type triode as the base drive signal to turn on three pole
Pipe, the load voltage of the first resistor is high level signal, and is exported as the trigger signal to the overcurrent protection
Module.
5. overcurrent protection peripheral circuit according to claim 3, it is characterised in that
When the triode is NPN type triode, the electrode input end of the comparator is connected to as the first input end
The load sampling end, the negative input of the comparator is connected to the defeated of the referrer module as second input
Go out end,
Wherein, when the sampled signal is more than or equal to the reference signal, the comparator exports high level signal, the ratio
The high level exported compared with device is exported to the base stage of the NPN type triode as the base drive signal to turn on three pole
Pipe, the load voltage of the first resistor is high level signal, and is exported as the trigger signal to the overcurrent protection
Module.
6. overcurrent protection peripheral circuit according to claim 1, it is characterised in that also include：
Comparator, two inputs of the comparator are respectively connecting to the output of the load sampling end and the referrer module
End, the output end of the comparator is connected to the grid of metal-oxide-semiconductor；
The metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor is connected to reference power source, and the drain electrode of the metal-oxide-semiconductor is connected to first resistor；
The first resistor, the first end of the first resistor is connected to the drain electrode of the metal-oxide-semiconductor, the second of the first resistor
End ground connection, the first end of the first resistor is additionally coupled to the overcurrent protection module,
Wherein, when the sampled signal is more than or equal to the reference signal, the output end of the comparator is to the metal-oxide-semiconductor
Grid exports gate drive signal, and to turn on the metal-oxide-semiconductor, the load voltage of the first resistor is defeated as the trigger signal
Go out to the overcurrent protection module.
7. overcurrent protection peripheral circuit according to claim 6, it is characterised in that
When the metal-oxide-semiconductor is N-channel MOS pipe, the negative input of the comparator is connected to institute as the first input end
Load sampling end is stated, the electrode input end of the comparator is connected to the output of the referrer module as second input
End,
Wherein, when the sampled signal is more than or equal to the reference signal, the comparator exports low level signal, the ratio
The low level exported compared with device is exported to the grid of the N-channel MOS pipe as the gate drive signal to turn on the MOS
Pipe, the load voltage of the first resistor is high level signal, and is exported as the trigger signal to the overcurrent protection
Module.
8. overcurrent protection peripheral circuit according to claim 6, it is characterised in that
When the metal-oxide-semiconductor is P-channel metal-oxide-semiconductor, the electrode input end of the comparator is connected to institute as the first input end
Load sampling end is stated, the negative input of the comparator is connected to the output of the referrer module as second input
End,
Wherein, when the sampled signal is more than or equal to the reference signal, the comparator exports high level signal, the ratio
The high level exported compared with device is exported to the grid of the P-channel metal-oxide-semiconductor as the gate drive signal to turn on the MOS
Pipe, the load voltage of the first resistor is high level signal, and is exported as the trigger signal to the overcurrent protection
Module.
9. overcurrent protection peripheral circuit according to any one of claim 1 to 8, it is characterised in that also include：
Filtration module, is connected between the load sampling end and the first input end of the comparison module, described for filtering out
Load the AC signal in the sampled signal of sampling end.
10. overcurrent protection peripheral circuit according to any one of claim 1 to 8, it is characterised in that
When the switch element is NPN type triode or PNP type triode, the drive end of the switch element is base stage.
11. overcurrent protection peripheral circuit according to any one of claim 1 to 8, it is characterised in that
When the switch element is P-channel metal-oxide-semiconductor or N-channel MOS pipe, the drive end of the switch element is grid.
12. a kind of electrical equipment, it is characterised in that including：
Overcurrent protection peripheral circuit as any one of claim 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276816.8U CN206379719U (en) | 2016-11-21 | 2016-11-21 | Overcurrent protection peripheral circuit and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276816.8U CN206379719U (en) | 2016-11-21 | 2016-11-21 | Overcurrent protection peripheral circuit and electrical equipment |
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| Publication Number | Publication Date |
|---|---|
| CN206379719U true CN206379719U (en) | 2017-08-04 |
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ID=59405144
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| CN201621276816.8U Active CN206379719U (en) | 2016-11-21 | 2016-11-21 | Overcurrent protection peripheral circuit and electrical equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174545A (en) * | 2019-04-30 | 2019-08-27 | 上海芯导电子科技有限公司 | A kind of multiplexing current detection circuit |
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN113991627A (en) * | 2021-11-03 | 2022-01-28 | 炬星科技（深圳）有限公司 | High-voltage bleeder circuit and electronic equipment |
-
2016
- 2016-11-21 CN CN201621276816.8U patent/CN206379719U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174545A (en) * | 2019-04-30 | 2019-08-27 | 上海芯导电子科技有限公司 | A kind of multiplexing current detection circuit |
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN113991627A (en) * | 2021-11-03 | 2022-01-28 | 炬星科技（深圳）有限公司 | High-voltage bleeder circuit and electronic equipment |
| CN113991627B (en) * | 2021-11-03 | 2023-10-31 | 炬星科技（深圳）有限公司 | High-voltage bleeder circuit and electronic equipment |
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