CN108780990A - Device for power switching current foldback circuit and motor driven systems, electric system - Google Patents
Device for power switching current foldback circuit and motor driven systems, electric system Download PDFInfo
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- CN108780990A CN108780990A CN201780008990.5A CN201780008990A CN108780990A CN 108780990 A CN108780990 A CN 108780990A CN 201780008990 A CN201780008990 A CN 201780008990A CN 108780990 A CN108780990 A CN 108780990A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
Abstract
A kind of device for power switching current foldback circuit (100) and motor driven systems, electric system, belong to the current protection technology of device for power switching in field of power electronics, the current foldback circuit (100) includes：Current sampling circuit (130), for inputting three-phase electric current to be detected and exporting three-phase sampled voltage signal；Demultiplexing circuit (110), it is electrically connected the output end of the three tunnels sampling branch (131,132,133) of current sampling circuit (130), demultiplexing circuit (110) is for detaching the sampled voltage signal that the current sampling circuit (130) exports and exporting d. c. voltage signal；Bleeder circuit (120) is electrically connected the output end of demultiplexing circuit (110), for carrying out partial pressure output detection voltage to the d. c. voltage signal.The overcurrent protection to device for power switching is realized by sample circuit (130), demultiplexing circuit (110) and bleeder circuit (120), simplifies the structure of device for power switching current foldback circuit (100).And the current foldback circuit (100) is free of integrated circuit, the reaction speed of current foldback circuit (100) is fast.
Description
Technical field
The invention relates to the current protection technologies of device for power switching in field of power electronics, more particularly to one kind
Device for power switching current foldback circuit and motor driven systems, electric system.
Background technology
Device for power switching such as insulated gate bipolar transistor (Insulated Gate Bipolar Transistor,
IGBT), mos field effect transistor (Metal Oxide Semiconductor, MOS) etc. is power electronics
The core semiconductor device in field, usual applied voltage current protecting circuit ensure that device for power switching is not in abnormal cases
It can fail, explode.
Currently a popular current foldback circuit is built by comparator, operational amplifier, when system power is set more than some
When determining overcurrent threshold values, either operational amplifier exports high level or low level to intelligent power (Intelligent to comparator
Power Module, IPM) module, all device for power switching of IPM modules shutdown.
During realizing the application, inventor has found that at least there are the following problems in the related technology：Although this overcurrent is protected
Protection circuit is not necessarily to that overcurrent protection work(can be realized by central processing unit (Central Processing Unit, CPU) control
Can, but device needed for this current foldback circuit is more, due to by integrated circuits such as comparator or operational amplifiers, causing
Current foldback circuit reaction speed is slower.
Invention content
The purpose of the embodiment of the present application is to provide a kind of device for power switching current foldback circuit and motor driven systems, electricity
Machine system can simplify the structure of device for power switching current foldback circuit, improve circuit reaction speed.
To achieve the above object, in a first aspect, the embodiment of the present application provides a kind of device for power switching overcurrent protection electricity
Road, the current foldback circuit include：
Current sampling circuit, for inputting three-phase electric current to be detected and exporting three-phase sampled voltage signal；
Demultiplexing circuit, is electrically connected the output end of the current sampling circuit, the demultiplexing circuit for pair
The three-phase sampled voltage signal of the current sampling circuit output is detached and exports three road d. c. voltage signals；
Bleeder circuit is electrically connected the output end of the demultiplexing circuit, for being carried out to the d. c. voltage signal
Partial pressure output detection voltage.
Optionally, the current foldback circuit further includes filter circuit, and the filter circuit connects the bleeder circuit
Output end, for filtering out the peak voltage in the detection voltage.
Optionally, the current sampling circuit includes that the first sampling branch, the second sampling branch and third sample branch, often
One sampling branch connects an electric current mutually to be detected.
Optionally, the demultiplexing circuit includes that the first separation branch, the second separation branch and third detach branch, institute
State the first end of the first separation branch, the first end difference of the first end and third separation branch of the second separation branch
Connection all the way sample branch output end, it is described first separation branch second end, it is described second separation branch second end and
The second end of the third separation branch interconnects, the output end as the demultiplexing circuit.
Optionally, the first sampling branch described in the current sampling circuit includes the first sampling resistor, and described first adopts
A phase current in the first end input three-phase current of sample resistance, the second end ground connection of first sampling resistor, described first
The first end of sampling resistor connects the first end of the first separation branch；
The second sampling branch includes the second sampling resistor, and the first end of second sampling resistor inputs three-phase current
In a phase current, the second end ground connection of second sampling resistor, the first end of second sampling resistor connects second point
First end from branch；
The third sampling branch includes third sampling resistor, and the first end of the third sampling resistor inputs three-phase current
In a phase current, the second end ground connection of the third sampling resistor, the first end connection described the of the third sampling resistor
The first end of three separation branches.
Optionally, the first separation branch includes the first diode, and the anode of first diode is as first point
First end from branch, the second end of the cathode of first diode as the first separation branch；
The second separation branch includes the second diode, and the anode of second diode is as the second separation branch
First end, the second end of the cathode of second diode as the second separation branch；
The third separation branch includes third diode, and the anode of the third diode detaches branch as third
First end, the cathode of the third diode detach the second end of branch as the third.
Optionally, the bleeder circuit includes the first divider resistance and the second divider resistance；
One end of first divider resistance is connect with the output end of the demultiplexing circuit, first divider resistance
The other end be grounded via second divider resistance, first divider resistance and second divider resistance it is commonly connected
End exports the detection voltage as output end.
Optionally, the filter circuit includes filter capacitor, and one end of the filter capacitor is defeated with the bleeder circuit
Outlet connects, other end ground connection.
Second aspect, the embodiment of the present application provide a kind of motor driven systems, the system comprises：
Power switch circuit works for driving motor；
Power switch control module is electrically connected with the power switch circuit, for controlling the power switch circuit
The motor is driven to work, and for closing the power switch circuit when detecting voltage and not meeting predetermined voltage；
The system also includes above-mentioned device for power switching current foldback circuit, the electric current in the current foldback circuit
The three-phase current of the input terminal connection power switch circuit of sample circuit, the output end of bleeder circuit export the detection voltage and arrive
The input terminal of the power switch control module.
Optionally, the power switch circuit includes first switch pipe, second switch pipe, third switching tube, the 4th switch
Pipe, the 5th switching tube and the 6th switching tube；
The first end of the first end of the first switch pipe, the first end and the third switching tube of the second switch pipe
Common connection, the common connection end connect positive pole, and the second end of the first switch pipe connects the 4th switching tube
First end, the second end of the second switch pipe connect the first end of the 5th switching tube, and the second of the third switching tube
End connects the first end of the 6th switching tube, and the second end of the 4th switching tube connects the first of the current sampling circuit
Sample the input terminal of branch, the input terminal of second end connection the second sampling branch of the 5th switching tube, the 6th switch
The input terminal of the second end connection third sampling branch of pipe；
The common connection end of the first switch pipe and the 4th switching tube, the second switch pipe and the described 5th are opened
The common connection end of pipe and the common connection end of third switching tube and the 6th switching tube are closed, is opened respectively as the power
The output end on powered-down road is used to connect the three-phase windings of the motor.
The third aspect, the embodiment of the present application provide a kind of electric system, and the electric system includes brshless DC motor,
The electric system further includes above-mentioned motor driven systems, the brshless DC motor and the work(in the motor driven systems
Rate switching circuit connects.
The advantageous effect of the application embodiment is：The case where being different from the prior art, the application embodiment is using electricity
The three-phase current of power switch circuit is converted into three-phase sampled voltage signal by stream sample circuit, passes through demultiplexing circuit pair three
Phase sampled voltage signal carries out separation three road d. c. voltage signals of output, then is divided d. c. voltage signal by bleeder circuit
Pressure obtains detection voltage, if detection voltage does not meet preset voltage value, each derailing switch in switch-off power switching circuit
Part carries out overcurrent protection to device for power switching.The application embodiment only passes through sample circuit, demultiplexing circuit and partial pressure
Circuit realizes the overcurrent protection to device for power switching, simplifies the structure of device for power switching current foldback circuit.And the mistake
Stream protection circuit is free of integrated circuit, and the reaction speed of current foldback circuit is fast.
Description of the drawings
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the structural schematic diagram of one embodiment of the application electric system；
Fig. 2 is the structural schematic diagram of one embodiment of the application electric system；
Fig. 3 is the structural schematic diagram of one embodiment of the application electric system；
Fig. 4 is the structural schematic diagram of one embodiment of the application electric system；
Fig. 5 is the structural schematic diagram of one embodiment of the application electric system；
Fig. 6 is the structural schematic diagram of one embodiment of the application electric system.
Specific implementation mode
To keep the purpose, technical scheme and advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall in the protection scope of this application.
Device for power switching overcurrent protection scheme provided by the embodiments of the present application is suitable for system shown in FIG. 1, the system
System includes brshless DC motor 20, power switch circuit 220 and power switch control module 210 and device for power switching overcurrent
Protect circuit 100.The power switch circuit 220, for driving brshless DC motor 20 to work, the power switch controls mould
Block 210, for controlling the work of 220 driving motor of power switch circuit.In order to ensure the switching device in power switch circuit 220
It will not fail, explode in abnormal cases, fault detection capability is integrated in the power switch control module 210, it is described
Power switch control module 210 is additionally operable to close power switch circuit when the three-phase current overcurrent in power switch circuit 220
220.Device for power switching current foldback circuit 100, for acquiring the three-phase current in power switch circuit 220 and exporting detection
The fault detection capability that voltage is internally integrated to power switch control module 210, the utilization of power switch control module 210, judges
Whether detection voltage meets predeterminated voltage, and power switch circuit 220 is closed if not meeting predeterminated voltage；Such as detect voltage
More than predeterminated voltage threshold values, then power switch circuit 220 is closed.
Fig. 2 is please referred to, device for power switching current foldback circuit 100 provided by the embodiments of the present application includes current sample electricity
Road 130, demultiplexing circuit 110 and bleeder circuit 120.The sample circuit 130 is used for the three of input power switch circuit 220
Phase current simultaneously exports three-phase sampled voltage signal.Optionally, circuit structure shown in fig. 5, electric current may be used in sample circuit 130
The setting of sample circuit 130 first sampling branch 131, second samples branch 132 and third samples branch 133, each sampling branch
For sampling a phase current.The demultiplexing circuit 110 is electrically connected the defeated of the three tunnels sampling branch of current sampling circuit 130
Outlet, the sampled voltage signal for being exported to the current sampling circuit are detached and export d. c. voltage signal.Partial pressure
Circuit 120 is electrically connected the output end of demultiplexing circuit 110, for carrying out partial pressure output inspection to the d. c. voltage signal
Survey voltage.The output of bleeder circuit 120 detects voltage to power switch control module 210.
The three-phase current of power switch circuit is converted into sampled voltage letter by the embodiment of the present application using current sampling circuit
Number, d. c. voltage signal is detached and exported to sampled voltage signal by demultiplexing circuit, then pass through bleeder circuit pair
D. c. voltage signal is divided, and detection voltage is obtained, if detection voltage does not meet preset voltage value, switch-off power switch
Each switching device in circuit carries out overcurrent protection to device for power switching.The embodiment of the present application only passes through sample circuit, signal
Split circuit and bleeder circuit realize the overcurrent protection to device for power switching, simplify device for power switching current foldback circuit
Structure.And the current foldback circuit is free of integrated circuit, the reaction speed of current foldback circuit is fast.
Since time that some are generated by noise extremely short spiking may be mingled in the sampled voltage signal,
And these spiking times are very short, can't be damaged to the switch element in switching power circuit 220, therefore do not need
Take overcurrent protection measure.But voltage is very big after the rectified partial pressure of these spikings, is easy to make power switch control circuit
210 erroneous judgement triggering overcurrent protection maloperations.So in order to avoid maloperation, optionally, in certain implementations of the electric system
In example, as shown in figure 4, the device for power switching current foldback circuit 100 further includes filter circuit 140, filter circuit 140 connects
The output end for connecing bleeder circuit 120 filters out the peak voltage in detection voltage.Detection voltage after filtered is output to work(
Rate ON-OFF control circuit 210.
Optionally, power switch circuit 220 has three-phase current, tri- tunnels 130 Ye You of corresponding current sampling circuit sampling branch
Road, in order to avoid being interfered with each other between each sampled signal, in some embodiments of electric system, as shown in figure 5, the signal point
Include that the first separation branch 111, second detaches branch 112 and third separation branch 113 from circuit 110, it is each to detach branch point
The other sampled voltage signal to each sampling branch output carries out rectification, and each sampled voltage signal after over commutation is defeated after collecting
Go out to bleeder circuit 120.
As shown in fig. 6, Fig. 6 provides current sampling circuit 130, signal in device for power switching current foldback circuit 100
The concrete structure of split circuit 110, bleeder circuit 120 and filter circuit 140.In other embodiments, current sampling circuit, letter
Number split circuit, bleeder circuit and filter circuit can also use it is existing can realize current sample function, Signal separator function,
The circuit structure of voltage divide function and filter function.
In this embodiment, current sampling circuit 130 includes the first sampling resistor RS1, the second sampling resistor RS2 and third
Sampling resistor RS3, the first sampling resistor RS1, the second sampling resistor RS2 and third sampling resistor RS3 are sampled respectively as three tunnels
Branch is used for sampling three-phase electric current.A phase current in the first end input three-phase current of first sampling resistor RS1, the second termination
Ground, first end are also connected with the anode of diode D1.Phase electricity in the first end input three-phase current of second sampling resistor RS2
Stream, second end ground connection, first end are also connected with the anode of diode D2.The first end of third sampling resistor RS3 inputs three-phase current
In a phase current, second end ground connection, first end is also connected with the anode of diode D3.
Demultiplexing circuit 110 includes the first diode D1, the second diode D2 and third diode D3, the first diode
D1, the second diode D2 and third diode D3 detach branch respectively as three tunnels and carry out rectification to three-phase sampled voltage signal.
The cathode of first diode D1, the second diode D2 and third diode D3 are connected to a bit, common connecting point connection partial pressure
Circuit 120.
Bleeder circuit 120 includes the first divider resistance Rd1 and the second divider resistance Rd2, one end of the first divider resistance Rd1
The common connection end of the first diode D1, the second diode D2 and third diode D3 cathode are connected, the first divider resistance Rd1's
The other end is via the second divider resistance Rd2 ground connection, the public connecting end work of the first divider resistance Rd1 and the second divider resistance Rd2
Detection voltage is exported for output end.
Filter circuit 140 includes filter capacitor C1, and the first end of filter capacitor C1 connects the first divider resistance Rd1 and second
The common connection end of divider resistance Rd2, second end ground connection, first end are also connected with the input terminal of power switch control circuit 210, to
Power switch control circuit 210 input it is filtered after detection voltage.
In the application embodiment, when power switch circuit 220, power switch control circuit 210 and power switch device
When the motor driven systems normal work that part current foldback circuit 100 forms, the voltage signal on the second divider resistance Rd2 is work(
The equal proportion of 220 current signal of rate switching circuit reflects that the voltage signal on the second divider resistance Rd2 is not enough to triggering work(at this time
Rate switch control module 210 carries out overcurrent protection operation.The detectable voltage signals that i.e. bleeder circuit 120 exports are less than power switch
210 preset threshold voltage of control module.At this point, 210 output pulse width modulation technique (Pulse of power switch control module
Width Modulation, PWM) signal is to power switch circuit 220, the switching tube alternate conduction in power switch circuit 220
Brshless DC motor 20 is driven to operate.
When motor driven systems work normally, three road sampling resistors, i.e. the first sampling resistor RS1, the second sampling resistor RS2
The voltage generated with third sampling resistor RS3 is smaller, and there are two types of situations at this time：The first situation is the voltage that sampling resistor generates
The forward conduction voltage of diode is not achieved, diode is in cut-off state, and the second divider resistance Rd2 no-voltage signals produce at this time
It is raw；The second situation is that the voltage that sampling resistor generates enables to diode current flow, but what the second divider resistance Rd2 was generated
Voltage signal is still smaller.For above-mentioned two situations, the voltage signal that power switch control module 210 receives all does not surpass
Preset voltage threshold is crossed, therefore, power switch circuit 220 works normally.
Motor driven systems occur it is abnormal cause in the case that electric current is excessive in power switch circuit 220, abnormal electricity
Stream flows through one or more of the first sampling resistor RS1, the second sampling resistor RS2 and third sampling resistor RS3, causes adopting
Higher sampled voltage signal, i.e. peak voltage are formed on sample resistance so that the first diode D1 in demultiplexing circuit 110,
One or more of second diode D2 and third diode D3 are connected.At this point, peak voltage is defeated after diode is depressured
Go out to bleeder circuit 120, first divider resistance Rd1 and the second divider resistance Rd2 divides buck signal in bleeder circuit 120
It is pressed in generation voltage division signal on the second divider resistance Rd2 and detects voltage, exported after the filtered capacitance C1 filtering of detection voltage
To power switch control module 210.Detection voltage at this time is higher than 210 preset threshold voltage of power switch control module, touches
The six road pwm signals exported are all set to low level by hair power switch control module 210 so that power switch circuit 220
In switching device it is all off, i.e. first switch pipe Q1, second switch pipe Q2, third switching tube Q3, the 4th switching tube Q4,
Five switching tube Q5 and the 6th switching tube Q6 are all off, to carry out overcurrent protection to device for power switching, avoid power switch
Component failure, explosion.
Compared with the existing technology, the application embodiment is only realized by diode, divider resistance, filter capacitor to power
The overcurrent protection of device for power switching in switching circuit, device for power switching current foldback circuit is simple in structure, and reaction speed is fast,
Component is few, small, is conducive to the miniaturization of product.
Correspondingly, Fig. 2 is please referred to, and the embodiment of the present application also provides a kind of motor driven systems 10, the motor driving
System 10 is for driving brshless DC motor 20 to work, and the motor driven systems 10 are including intelligent power module 200 and as above
The device for power switching current foldback circuit 100.The intelligent power module 200 is IPM modules, is integrated with power switch
The function of circuit and power switch control module, the power switch circuit work for driving motor, the power switch control
Molding block, for controlling the work of power switch circuit driving motor.The power switch control module is also integrated with fault detect
Function, for closing power switch circuit when the three-phase current overcurrent in power switch circuit.The device for power switching mistake
Stream protection circuit 100 controls mould for acquiring the three-phase current in power switch circuit and exporting detection voltage to power switch
Block, power switch control module judge whether detection voltage does not meet predeterminated voltage using the fault detection capability being internally integrated,
Such as whether detection voltage is more than predeterminated voltage threshold values, and power switch circuit is closed if not meeting predeterminated voltage.Wherein, work(
Device for power switching current foldback circuit provided by the embodiments of the present application can be used in rate switching device current foldback circuit 100, not
The technical detail of detailed description and effect description in the motor driven systems embodiment, reference can be made to the embodiment of the present application is provided
Device for power switching current foldback circuit.
Optionally, as shown in figure 3, in other embodiments, integrated intelligent power module can not also be used and used
The power switch circuit 220 and power switch control module 210 built respectively, the power switch control module 210 and power
Switching circuit 220 connects, and the on or off for controlling switching tube in power switch circuit 220 drives brshless DC motor with this
20 work.The power switch control module is also integrated with fault detection capability, for when the three-phase in power switch circuit 220
Power switch circuit 220 is closed when overcurrent.The device for power switching current foldback circuit 100 is for acquiring power switch
Three-phase current in circuit 220 simultaneously exports detection voltage and arrives power switch control module 210, and power switch control module 210 is sharp
With the fault detection capability being internally integrated, judge to detect whether voltage does not meet predeterminated voltage, such as whether detection voltage is more than
Predeterminated voltage threshold values closes power switch circuit 220 if not meeting predeterminated voltage.
Wherein, in the occasion using integrated IPM modules, preset threshold voltage can set according to specifications, adopt
It, can be according to each resistance in current foldback circuit with the occasion for building power switch control module and power switch circuit respectively
Resistance value is set, and the selection principle of the first divider resistance Rd1 and the second divider resistance Rd2 are, it is to be ensured that power switch circuit 220 is just
Often voltage signal when work on the second divider resistance Rd2 is no more than preset threshold voltage.
Fig. 6 is please referred to, Fig. 6 provides the concrete structure of power switch circuit 220, and in this embodiment, the power is opened
Powered-down road 220 includes first switch pipe Q1, second switch pipe Q2, third switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5
With the 6th switching tube Q6；Wherein, the switching tube can be one kind in metal-oxide-semiconductor, IGBT pipes, triode.
The upper bridge arm of first switch pipe Q1, second switch pipe Q2, third switching tube Q3 as power switch circuit 220, the
Four switching tube Q4, the lower bridge arm of the 5th switching tube Q5 and the 6th switching tube Q6 as power switch circuit 220.First switch pipe Q1
First end, the first end of the first end of second switch pipe Q2 and third switching tube Q3 connect jointly, common connection end connection
Positive pole, the second end of first switch pipe Q1 connect the first end of the 4th switching tube Q4, and the second end of second switch pipe Q2 connects
The first end of the 5th switching tube Q5 is connect, the second end of third switching tube Q3 connects the first end of the 6th switching tube Q6, the 4th switch
The second end that the second end of pipe Q4 connects the first sampling resistor RS1, the 5th switching tube Q5 connects the second sampling resistor RS2, and the 6th
The second end third sampling resistor RS3 of switching tube Q6.First switch pipe Q1, second switch pipe Q2, third switching tube Q3, the 4th open
Close the output end of the control terminal connection power switch control circuit 210 of pipe Q4, the 5th switching tube Q5 and the 6th switching tube Q6.First
The common connection end of switching tube Q1 and the 4th switching tube Q4, second switch pipe Q2 and the 5th switching tube Q5 common connection end and
The common connection end of third switching tube Q3 and the 6th switching tube Q6 connect the three-phase windings of motor.Wherein, the of the switching tube
It is the emitter or source electrode of switching tube that one end, which is the second end of the collector either drain electrode switching tube of switching tube, switching tube
Control terminal is the gate pole or grid of switching tube.
Fig. 2-Fig. 6 is please referred to, the embodiment of the present application also provides a kind of electric system, the electric system includes brushless straight
Galvanic electricity machine 20 and for drive brshless DC motor 20 work motor driven systems 10.Wherein, motor driven systems 10 can be adopted
With motor driven systems 10 provided by the embodiments of the present application, the technology of detailed description is not thin in the motor driven systems embodiment
Section and effect description, reference can be made to the device for power switching current foldback circuit that the embodiment of the present application is provided.
Finally it should be noted that：Above example is only to illustrate the technical solution of the application, rather than its limitations；At this
Under the thinking of application, it can also be combined between the technical characteristic in above example or different embodiments, and exist such as
Many other variations of the different aspect of the upper described the application, for simplicity, they are not provided in details；Although reference
The application is described in detail in previous embodiment, it will be understood by those of ordinary skill in the art that：It still can be right
Technical solution recorded in foregoing embodiments is modified or equivalent replacement of some of the technical features；And this
A little modification or replacements, the range of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (11)
1. a kind of device for power switching current foldback circuit, which is characterized in that the current foldback circuit includes：
Current sampling circuit, for inputting three-phase electric current to be detected and exporting three-phase sampled voltage signal；
Demultiplexing circuit, is electrically connected the output end of the current sampling circuit, and the demultiplexing circuit is used for described
The three-phase sampled voltage signal of current sampling circuit output is detached and exports three road d. c. voltage signals；
Bleeder circuit is electrically connected the output end of the demultiplexing circuit, for being divided to the d. c. voltage signal
Output detection voltage.
2. current foldback circuit according to claim 1, which is characterized in that the current foldback circuit further includes filtered electrical
Road, the filter circuit connect the output end of the bleeder circuit, for filtering out the peak voltage in the detection voltage.
3. current foldback circuit according to claim 1 or 2, which is characterized in that the current sampling circuit includes first
It samples branch, the second sampling branch and third and samples branch, each sampling branch connects an electric current mutually to be detected.
4. current foldback circuit according to claim 3, which is characterized in that the demultiplexing circuit includes the first separation
Branch, the second separation branch and third detach branch, the first end of the first separation branch, the second separation branch the
The first end of one end and third separation branch is separately connected the output end for sampling branch all the way, the first separation branch
The second end of second end, the second end of the second separation branch and third separation branch interconnects, as the letter
The output end of number split circuit.
5. current foldback circuit according to claim 4, which is characterized in that first adopts described in the current sampling circuit
Sample branch includes the first sampling resistor, and the phase current in the first end input three-phase current of first sampling resistor is described
The second end of first sampling resistor is grounded, and the first end of first sampling resistor connects the first of the first separation branch
End；
The second sampling branch includes the second sampling resistor, and the first end of second sampling resistor inputs in three-phase current
One phase current, the second end ground connection of second sampling resistor, described second point of the first end connection of second sampling resistor
First end from branch；
The third sampling branch includes third sampling resistor, in the first end input three-phase current of the third sampling resistor
The first end of one phase current, the second end ground connection of the third sampling resistor, the third sampling resistor connects the third point
First end from branch.
6. current foldback circuit according to claim 4, which is characterized in that the first separation branch includes the one or two pole
Pipe, the first end of the anode of first diode as the first separation branch, the cathode conduct of first diode
The second end of the first separation branch；
The second separation branch includes the second diode, and the anode of second diode is as the second separation branch
First end, the second end of the cathode of second diode as the second separation branch；
The third separation branch includes third diode, and the anode of the third diode detaches branch as the third
First end, the cathode of the third diode detach the second end of branch as the third.
7. current foldback circuit according to claim 1, which is characterized in that the bleeder circuit includes the first divider resistance
With the second divider resistance；
One end of first divider resistance is connect with the output end of the demultiplexing circuit, first divider resistance it is another
One end is grounded via second divider resistance, and the public connecting end of first divider resistance and second divider resistance is made
The detection voltage is exported for output end.
8. current foldback circuit according to claim 2, which is characterized in that the filter circuit includes filter capacitor, institute
The one end for stating filter capacitor is connect with the output end of the bleeder circuit, other end ground connection.
9. a kind of motor driven systems, which is characterized in that the system comprises：
Power switch circuit works for driving motor；
Power switch control module is electrically connected with the power switch circuit, for controlling the power switch circuit driving
The motor work, and for closing the power switch circuit when detecting voltage and not meeting predetermined voltage；
The device for power switching current foldback circuit described in any one the system also includes power 1 to power 8, the overcurrent are protected
The input terminal of current sampling circuit in protection circuit connects the three-phase current of the power switch circuit, the output end of bleeder circuit
Export it is described detection voltage to the power switch control module input terminal.
10. motor driven systems according to claim 9, which is characterized in that the power switch circuit is opened including first
Guan Guan, second switch pipe, third switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube；
The first end of the first end of the first switch pipe, the first end of the second switch pipe and the third switching tube is common
Connection, the common connection end connect positive pole, and the second end of the first switch pipe connects the first of the 4th switching tube
End, the second end of the second switch pipe connect the first end of the 5th switching tube, and the second end of the third switching tube connects
The first end of the 6th switching tube is connect, the second end of the 4th switching tube connects the first sampling of the current sampling circuit
The input terminal of branch, the input terminal of second end connection the second sampling branch of the 5th switching tube, the 6th switching tube
Second end connects the input terminal of third sampling branch；
The common connection end of the first switch pipe and the 4th switching tube, the second switch pipe and the 5th switching tube
Common connection end and third switching tube and the 6th switching tube common connection end, respectively as the power switch electricity
The output end on road is used to connect the three-phase windings of the motor.
11. a kind of electric system, including brshless DC motor, which is characterized in that the electric system further include claim 9 or
Motor driven systems described in 10, the brshless DC motor are connect with the power switch circuit in the motor driven systems.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/100781 WO2019047079A1 (en) | 2017-09-06 | 2017-09-06 | Power switching component overcurrent protection circuit, motor driving system, and motor system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108780990A true CN108780990A (en) | 2018-11-09 |
Family
ID=64034054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780008990.5A Pending CN108780990A (en) | 2017-09-06 | 2017-09-06 | Device for power switching current foldback circuit and motor driven systems, electric system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108780990A (en) |
| WO (1) | WO2019047079A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110676809A (en) * | 2019-09-20 | 2020-01-10 | 深圳供电局有限公司 | Zero line breaking protection circuit for three-phase four-wire system |
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| CN101409441A (en) * | 2008-10-23 | 2009-04-15 | 南京瑞鹏科技有限公司 | Overcurrent protection circuit for switch magneto resistance speed-regulating motor |
| CN101783506A (en) * | 2009-12-16 | 2010-07-21 | 艾默生网络能源有限公司 | Detection and current-limiting protection circuit |
| CN103078520A (en) * | 2011-10-26 | 2013-05-01 | 乐星产电(无锡)有限公司 | Frequency converter device and over-current protection method thereof |
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| CN110676809A (en) * | 2019-09-20 | 2020-01-10 | 深圳供电局有限公司 | Zero line breaking protection circuit for three-phase four-wire system |
| CN110676809B (en) * | 2019-09-20 | 2021-12-03 | 深圳供电局有限公司 | Zero line breaking protection circuit for three-phase four-wire system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019047079A1 (en) | 2019-03-14 |
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