CN110535100A - Protection circuit of inverter based on BUS voltage stepping - Google Patents
Protection circuit of inverter based on BUS voltage stepping Download PDFInfo
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- CN110535100A CN110535100A CN201910971708.4A CN201910971708A CN110535100A CN 110535100 A CN110535100 A CN 110535100A CN 201910971708 A CN201910971708 A CN 201910971708A CN 110535100 A CN110535100 A CN 110535100A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 26
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- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
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- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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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
- 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
- H02H7/1227—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 abnormalities in the output circuit, e.g. short circuit
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Abstract
The present invention provides a kind of protection circuit of inverter based on BUS voltage stepping; with obtain the current sampling module to the current feedback signal of inverter, the transistor ON in control inverter or the controller of closing and the positive terminal and negative pole end of BUS voltage are respectively connected with; include voltage stepping judgment module; receive cathode voltage from positive terminal, come voltage gear corresponding when judging the cathode voltage for overvoltage condition voltage and exports overvoltage reference signal corresponding with the voltage gear based on multiple grades of different reference voltages；Overcurrent signal generation module, receive current feedback signal, judge that the current feedback signal is overcurrent condition signal or working state signal based on overvoltage reference signal, when current feedback signal is when being shown as overcurrent condition signal, generates overcurrent signal；And clamper protective module, according to the switch control signal that overcurrent signal exports come clamp position controller transistor is in close state.
Description
Technical field
The invention belongs to technical field of inverter control, and in particular to a kind of inverter protection based on BUS voltage stepping
Circuit.
Background technique
Important equipment of the inverter as new energy is widely used in the neck such as wind-powered electricity generation, solar energy, new-energy automobile
Domain.It is well known that due to the presence of transistor random thoughts itself and link random thoughts, the shutdown Vce voltage meeting of transistor at work
Increase with the increase of electric current, but comprehensively considers from cost etc., it can not unconfined selection high voltage when design
Transistor as design, if therefore inverter BUS overtension, in normal work will transistor both ends generate it is higher
Vce voltage cause inverter to break down, burn, even safety accident so that breakdown transistors are damaged.Therefore, root
The different output electric currents current foldback circuit different with setting, which is arranged, to inverter according to different BUS voltages is very important.
Pervious inverter current foldback circuit is to set a fixed overcurrent protection threshold for a certain BUS voltage value
Value, or one overcurrent protection threshold values is not set with reference to BUS voltage artificially, when the output electric current of inverter is once super
When crossing the overcurrent protection threshold value, controller is enabled to stop working, so that transistor be made to be in close state.But transistor protection
There is direct relation with BUS voltage, when BUS overtension, even if the output electric current of very little is likely to make in inverter
Transistor it is breakdown, lead to aircraft bombing.
Inverter is usually operated at biggish BUS voltage range, and single overcurrent protection threshold value is arranged and is not able to satisfy reality
Application scenarios only consider that single overcurrent protection threshold value easily causes transistor breakdown and damages.Therefore, a basis is designed
Different BUS voltage values carry out the output electric current of control inverter and protect crystalline substance according to overcurrent protection is arranged under different BUS voltages
The scheme of body pipe is particularly important.
Summary of the invention
The present invention is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide a kind of based on the inverse of BUS voltage stepping
Become device and protect circuit, even if BUS voltage has biggish dynamic range, the transistor in inverter will not be caused because of voltage mistake
It is damaged when high.
To achieve the goals above, present invention employs the following technical solutions:
The present invention provides a kind of protection circuit of inverter based on BUS voltage stepping, and for the output to inverter
Electric current is measured in real time and exports the current sampling module of corresponding current feedback signal, for controlling the crystalline substance in inverter
The positive terminal and negative pole end of controller and BUS voltage that body pipe is opened or closed be respectively connected with comprising:
Voltage stepping judgment module, receives cathode voltage from positive terminal, and anode electricity is judged based on multiple grades of different reference voltages
Pressure voltage gear corresponding when being overvoltage condition voltage simultaneously exports overvoltage reference signal corresponding with the voltage gear；
Overcurrent signal generation module, receives current feedback signal, judges that the current feedback signal is based on overvoltage reference signal
Overcurrent condition signal or working state signal are generated when current feedback signal is when being shown as overcurrent condition signal
Overcurrent signal；And clamper protective module, made according to the switch control signal that overcurrent signal exports come clamp position controller
Transistor is in close state.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, voltage stepping judgment module contains stepping multilevel iudge portion and divider, and stepping multilevel iudge portion is mutually independent by n
Comparator as shelves comparator is constituted, and the normal phase input end of each grade of comparator receives corresponding shelves reference voltage, negative
Input terminal receives cathode voltage from positive terminal, n shelves comparator according to voltage gear ascending order, be followed successively by first grade of comparator,
Second gear comparator ..., n-th speed position comparator, first grade of comparator, second gear comparator ..., n-th speed position comparator institute it is right
The shelves reference voltage that should receive is sequentially increased, divider by with the n shelves comparator one-to-one n electricity as shelves resistance
The resistance composition of resistance and be connected in series with each other two as divider resistance, one end of shelves resistance and corresponding shelves comparator
Output end be connected, the other end is connected with the connecting pin of two divider resistances, and overcurrent signal generation module contains conduct
The comparator of overcurrent comparator and resistance as signal pull-up resistor, the normal phase input end of overcurrent comparator is from connection
Termination has received voltage reference signal, and negative-phase input receives current feedback signal from current sampling module, signal pull-up resistor
One end is connected with the output end of overcurrent comparator, and the other end receives high level voltage, and n is the positive integer not less than 2.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, when current feedback signal is overcurrent condition signal, overcurrent signal is low level signal, the switch control letter being clamped
Number be low level signal so that transistor is in close state.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, when current feedback signal is shown as working state signal, overcurrent signal generation module, which generates, is used as operating current signal
High level signal.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, when cathode voltage is less than the reference voltage that first grade of comparator is received, the output of voltage stepping judgment module is used as work
The high level signal of voltage reference signal, overcurrent signal generation module generate the high level signal as operating current signal.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, the shelves reference voltage that first grade of comparator is received is not more than the rated operational voltage of transistor.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, can also have the following features:
It include: signal hysteresis module, it is sluggish for overcurrent signal to occur, wherein there is signal hysteresis module one to be used as hysteresis
The diode of diode and the resistance as hysteresis resistance, the output of the anode and overcurrent comparator of hysteresis diode
End, cathode are connected with one end of hysteresis resistance, and the other end of hysteresis resistance is connected with connecting pin.
In the protection circuit of inverter provided by the invention based on BUS voltage stepping, it can also have the following features:
In, the number of the transistor in inverter is m, and the number of switch control signal is m, and controller has and m transistor
Corresponding m signal output end respectively, for m switch control signal to be provided correspondingly to m transistor, clamper protection
Module, which contains, distinguishes the corresponding and mutually independent m diode as clamp diode, m pincers with m signal output end
The anode of position diode is connected with the output end of overcurrent comparator, and the cathode of m catching diode is exported with m signal
End connects one to one, and m is the positive integer not less than 2.
The action and effect of invention
Protection circuit of inverter based on BUS voltage stepping involved according to the present invention, because having voltage stepping to sentence
Disconnected module, overcurrent signal generation module and clamped protective module, voltage stepping judgment module can be joined based on different shelves
Voltage is examined to judge voltage gear corresponding to the cathode voltage of BUS voltage and export overvoltage ginseng corresponding with the voltage gear
Signal is examined, overcurrent signal generation module can judge that current feedback signal is overcurrent condition based on overvoltage reference signal
Signal or working state signal, when the current feedback signal is when being shown as overcurrent condition signal, overcurrent signal
Generation module generates overcurrent signal, the switch control that clamper protective module is exported according to the overcurrent signal come clamp position controller
Signal is in close state transistor, so, the voltage stepping judgment module in the present invention can be according to different BUS electricity
Pressure exports corresponding different overvoltage reference signal, even if inverter in higher BUS operating at voltages, can also have
The danger for effect transistor being prevented to be damaged by BUS overtension, to improve the safety of inverter.
Detailed description of the invention
Fig. 1 is the structural block diagram of the protection circuit of inverter based on BUS voltage stepping in the embodiment of the present invention；
Fig. 2 is the circuit diagram of the protection circuit of inverter based on BUS voltage stepping in the embodiment of the present invention；
Fig. 3 is the structural block diagram of the protection circuit of inverter based on BUS voltage stepping in variation of the invention；And
Fig. 4 is the circuit diagram of the protection circuit of inverter based on BUS voltage stepping in variation of the invention.
Specific embodiment
It is real below in order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention
Example combination attached drawing is applied to be specifically addressed the protection circuit of inverter provided by the invention based on BUS voltage stepping.
<embodiment>
Fig. 1 is the structural block diagram of the protection circuit of inverter based on BUS voltage stepping in the embodiment of the present invention.
As shown in Figure 1, protection circuit of inverter 100 based on BUS voltage stepping in the present embodiment with there is Width funtion
BUS voltage 10 positive terminal and negative pole end, the output electric current of inverter 20 is measured in real time and exports corresponding electricity
The controller 40 for flowing the current sampling module 30 of feedback signal and transistor ON or closing in control inverter 20 is distinguished
It is connected, and the transistor in inverter 20 is protected.The protection circuit of inverter 100 based on BUS voltage stepping has
There are voltage stepping judgment module 110, overcurrent signal generation module 120 and clamper protective module 130.
Voltage stepping judgment module 110 receives cathode voltage from the positive terminal of BUS voltage 10, based on multiple grades of different ginsengs
Voltage is examined to judge that the cathode voltage is overvoltage condition voltage or working condition voltage, when the cathode voltage is once shown as
When overvoltage condition voltage, judges voltage gear corresponding to the cathode voltage and export corresponding with the voltage gear excessively electric
Pressure reference signal；When the cathode voltage, which is shown, is in working condition voltage, output services voltage reference signal.
Overcurrent signal generation module 120 receives current feedback signal from current sampling module 30, is referred to based on overvoltage
Once signal judges that the current feedback signal is overcurrent condition signal or working state signal, when current feedback signal aobvious
When being shown as overcurrent condition signal, overcurrent signal is generated；When current feedback signal is shown as working state signal, work is generated
Make current signal.
Clamper protective module 130 is believed when overcurrent signal generation module 120 generates overcurrent signal according to the overcurrent
The switch control signal for number carrying out the output of clamp position controller 40 is in close state the transistor in inverter 20.
Fig. 2 is the circuit diagram of the protection circuit of inverter based on BUS voltage stepping in the embodiment of the present invention.
As shown in Fig. 2, voltage stepping judgment module 110 contains stepping multilevel iudge portion 111 and divider 112.
Stepping multilevel iudge portion 111 is made of the n mutually independent comparators as shelves comparator, and n is not less than 2
Positive integer.The normal phase input end of each grade of comparator is corresponding to receive a shelves reference voltage, and negative-phase input is from BUS voltage 10
Positive terminal receive cathode voltage VBUS.Also, a shelves reference voltage received with it is set to each grade of comparator
Corresponding voltage gear.
N shelves comparator is followed successively by first grade of comparator Ad1, second gear comparator according to the ascending order of voltage gear
Ad2 ..., n-th speed position comparator Adn.Correspondingly, first grade of comparator Ad1, second gear comparator Ad2 ..., n-th speed position ratio
The n shelves reference voltage compared with receiving corresponding to device Adn is respectively first grade of reference voltage Vref 1, second gear reference voltage
Vref2 ..., n-th speed position reference voltage Vref n；Also, Vref1, Vref2 ..., Vrefn is sequentially increased, it may be assumed that Vref1 <
Vref2<……<Vrefn.In order to ensure the safety of transistor, nominal operation of the Vref1 no more than transistor 21 in inverter 20
Voltage Vce.In the present embodiment, the interval of Vref1 and Vref2 ..., the spacing of Vrefn-1 and Vrefn be that 10-50 is lied prostrate,
It can be configured according to actual needs.
Divider 112 is by two as the resistance R1 and resistance R2 of divider resistance and respectively as the resistance of shelves resistance
Rd1, resistance Rd2 ..., resistance Rdn constitute.
One end of resistance R1 receives high level voltage, one end and overcurrent signal generation module of the other end and resistance R2
120 are connected；The other end of resistance R2 is connected with the negative pole end of BUS voltage 10.
Resistance Rd1, resistance Rd2 ..., one end of resistance Rdn and first grade of comparator Ad1, second gear comparator
Ad2 ..., the output end of n-th speed position comparator Adn connect one to one, resistance Rd1, resistance Rd2 ..., resistance Rdn it is another
One end is all connected with the connecting pin of resistance R1 and resistance R2.
As shown in Fig. 2, overcurrent signal generation module 120 contains as the comparator A1 of overcurrent comparator and conduct
The resistance R3 of signal pull-up resistor.
The normal phase input end of comparator A1 receives operating voltage reference signal or mistake from the connecting pin of resistance R1 and resistance R2
Voltage reference signal Vref0, negative-phase input receive current feedback signal INV_I from current sampling module 30.
One end of resistance R3 is connected with the output end of comparator A1, and the other end receives high level voltage V.
In the present embodiment, as shown in Fig. 2, there is inverter 20 m transistor 21 (to illustrate only a transistor in figure
Structure), m is positive integer not less than 2.There is each transistor a control electrode G, control electrode G to form a switch control
End processed.Correspondingly, controller 40 generate m switch control signal PWM1 corresponding with m transistor 21 respectively,
PWM2,……,PWMm；Controller 40 has m signal output ends corresponding with m transistor 21 respectively, for m to be opened
Close control signal PWM1, PWM2 ..., PWMm be provided correspondingly to m switch control terminal, successively have on m signal output end
Have resistance Rz1, resistance Rz2 ..., resistance Rzm.
As shown in Fig. 2, clamper protective module 130 contains m corresponding and mutually independent with m signal output end difference
As the diode of clamp diode, the m catching diode be respectively diode Dz1, diode Dz2 ..., diode
Dzm.Diode Dz1, diode Dz2 ..., diode Dzm anode be connected with the output end of comparator A1, to connect
The operating current signal or overcurrent signal INV_OVER generated by overcurrent signal generation module 120；Diode Dz1, two poles
Pipe Dz2 ..., the cathode of diode Dzm and m signal output end connect one to one.
Below with reference to Fig. 2 to the working principle of the protection circuit of inverter 100 based on BUS voltage stepping in the present embodiment
It is illustrated.
When the cathode voltage VBUS of BUS voltage 10 is less than first grade of reference voltage Vref 1, the voltage of BUS voltage 10 is
Working condition voltage.At this point, all grades of comparators all output high impedances, the output of voltage stepping judgment module 110 is as work electricity
The high level signal Vref0 of pressure reference signal, Vref0=Vref00=V*R1/ (R1+R2) at this time, the negative of comparator A1
The current feedback signal INV_I of input terminal is less than operating voltage reference signal Vref00, that is, current feedback signal INV_I
It is shown as working state signal, so that overcurrent signal generation module 120 generates the high level signal as operating current signal
INV_OVER, the operating current signal will not influence the normal output of switch control signal in controller 40, at this time inverter 20
In transistor 21 be in normal operating conditions.
When the cathode voltage VBUS of BUS voltage 10 is greater than first grade of reference voltage Vref 1 and is less than second gear reference voltage
When Vref2, the voltage of BUS voltage 10 is the overvoltage condition voltage corresponding to first voltage shelves.At this point, first grade of comparator
Ad1 exports Low ESR, other grade of comparator output high impedances, and the output of voltage stepping judgment module 110 is referred to as overvoltage
The low level signal Vref0 of signal, Vref0=Vref01=V*R1/ (R1+R2//Rd1) at this time, the negative of comparator A1 are defeated
The current feedback signal INV_I for entering end is greater than overvoltage reference signal Vref01, so that overcurrent signal generation module 120 is raw
At the low level signal INV_OVER as overcurrent signal, clamped protective module 130 is according to overcurrent signal INV_OVER
Switch control signal PWM1, PWM2 that controller 40 is exported ..., PWMm all clampers be low level signal so that inversion
All transistors in device 20 are in close state.
When the cathode voltage VBUS of BUS voltage 10 is greater than second gear reference voltage Vref 2 and is less than third gear reference voltage
When Vref3, the voltage of BUS voltage 10 is the overvoltage condition voltage corresponding to second voltage shelves.At this point, first grade of comparator
Ad1 and second gear comparator Ad2 export Low ESR, other grade of comparator all output high impedances, voltage stepping judgment module 110
Low level signal Vref0 as overvoltage reference signal is exported, Vref0=Vref02=V*R1/ at this time (R1+R2//
Rd1//Rd2), the current feedback signal INV_I of the negative-phase input of comparator A1 is greater than overvoltage reference signal Vref02,
To which overcurrent signal generation module 120 generates the low level signal INV_OVER as overcurrent signal, clamped protective module
130 controller 40 is exported according to overcurrent signal INV_OVER switch control signal PWM1, PWM2 ..., PWMm all
Clamper is low level signal so that all transistors in inverter 20 are in close state.
And so on, when the cathode voltage VBUS of BUS voltage 10 is greater than n-th speed position reference voltage Vref n, BUS voltage 10
Voltage be overvoltage condition voltage corresponding to the n-th voltage gear.At this point, first grade of comparator Ad1, second gear comparator
Ad2 ..., n-th speed position comparator Adn all export Low ESR, the output of voltage stepping judgment module 110 is used as overvoltage reference signal
Low level signal Vref0, Vref0=Vref0n=V*R1/ (R1+R2//Rd1//Rd2//... Rdn) at this time, comparator A1
Negative-phase input current feedback signal INV_I be greater than overvoltage reference signal Vref0n, thus overcurrent signal generate
Module 120 generates the low level signal INV_OVER as overcurrent signal, and clamped protective module 130 is according to the overcurrent signal
Switch control signal PWM1, PWM2 that INV_OVER exports controller 40 ..., PWMm all clampers be low level signal to
So that all transistors in inverter 20 are in close state.
The action and effect of embodiment
Protection circuit of inverter based on BUS voltage stepping according to involved in the present embodiment, because having voltage stepping
Judgment module, overcurrent signal generation module and clamped protective module, voltage stepping judgment module can be based on different shelves
Reference voltage judges voltage gear corresponding to the cathode voltage of BUS voltage and exports overvoltage corresponding with the voltage gear
Reference signal, overcurrent signal generation module can judge that current feedback signal is overcurrent shape based on overvoltage reference signal
State signal or working state signal, when the current feedback signal is when being shown as overcurrent condition signal, overcurrent is believed
Number generation module generates overcurrent signal, the switch control that clamper protective module is exported according to the overcurrent signal come clamp position controller
Signal processed is in close state transistor, so, the voltage stepping judgment module in the present embodiment can be according to different
The corresponding different overvoltage reference signal of BUS voltage output, though inverter in higher BUS operating at voltages,
It can be effectively prevented the danger that transistor is damaged by BUS overtension, to improve the safety of inverter.
<variation>
This variation is the further improvement of embodiment, for constituent element identical in embodiment, give identical
Symbol, and omit identical explanation.
Fig. 3 is the structural block diagram of the protection circuit of inverter based on BUS voltage stepping in variation of the invention；Fig. 4 is
The circuit diagram of protection circuit of inverter based on BUS voltage stepping in variation of the invention.
As shown in Figure 3 and Figure 4, the protection circuit of inverter 200 based on BUS voltage stepping in this variation, which has, implements
Outside the constituent element contained by the protection circuit of inverter 100 based on BUS voltage stepping in example, also there is a signal hysteresis
Module 240.
Signal hysteresis module 240 has the diode D1 as the hysteresis diode and resistance R4 as hysteresis resistance.
The output end of the anode and comparator A1 of diode D1, cathode are connected with one end of resistance R4；The other end and electricity of resistance R4
Resistance R1 is connected with the normal phase input end of the connecting pin of resistance R2 and comparator A1.The signal hysteresis module 240 was for making
Sluggishness occurs for the overcurrent signal INV_OVER that current signal generation module 120 generates, for example, when the anode electricity of BUS voltage 10
When VBUS being pressed to be greater than first grade of reference voltage Vref 1 and be less than second gear reference voltage Vref 2, overvoltage reference signal at this time
Vref0=Vref01'=V*R1/ (R1+R2//Rd1//R4) is less than Vref01=V*R1/ (R1+R2//Rd1).
In this variation, stagnant because being provided with signal between the output end and normal phase input end of overcurrent comparator
Module is returned, then, when overcurrent signal generation module generates overcurrent signal, signal hysteresis module enables to overvoltage to join
It examines signal and generates return difference, so that sluggishness occurs for the overcurrent signal, extend the shut-in time of transistor, avoid transistor
It is damaged because frequently switching on, further improves the service life of inverter.
Above embodiment is preferred case of the invention, the protection scope being not intended to limit the invention.
For example, in the above-described embodiment, the overcurrent signal that can also generate overcurrent signal generation module is direct
The processor being conveyed in controller, the processor enable controller stop working according to overcurrent signal to stop issuing switch control
Signal processed, better assuring is in close state transistor, to further improve the safety of inverter.
Claims (8)
1. a kind of protection circuit of inverter based on BUS voltage stepping is examined in real time with for the output electric current to inverter
Survey and export corresponding current feedback signal current sampling module, for control transistor ON in the inverter or
The controller of closing and the positive terminal and negative pole end of BUS voltage be respectively connected with comprising:
Voltage stepping judgment module receives cathode voltage from the positive terminal, is judged based on multiple grades of different reference voltages
Cathode voltage voltage gear corresponding when being overvoltage condition voltage simultaneously exports overvoltage corresponding with the voltage gear
Reference signal；
Overcurrent signal generation module receives the current feedback signal, judges the electricity based on the overvoltage reference signal
Flowing feedback signal is overcurrent condition signal or working state signal, when the current feedback signal is once shown as overcurrent
When status signal, overcurrent signal is generated；And
Clamper protective module, made according to the overcurrent signal come the switch control signal that controller described in clamper exports described in
Transistor is in close state.
2. the protection circuit of inverter according to claim 1 based on BUS voltage stepping, it is characterised in that:
Wherein, the voltage stepping judgment module contains stepping multilevel iudge portion and divider,
Stepping multilevel iudge portion is made of the n mutually independent comparators as shelves comparator,
The normal phase input end of each shelves comparator receives the corresponding shelves reference voltage, negative-phase input from it is described just
Extremely receive the cathode voltage,
The n shelves comparators are followed successively by first grade of comparator, second gear and compare according to the ascending order of the voltage gear
Device ..., n-th speed position comparator, first grade of comparator, the second gear comparator ..., the n-th speed position comparator institute
The corresponding shelves reference voltage received is sequentially increased,
The divider by with resistance and be serially connected company of n one-to-one n of the shelves comparator as shelves resistance
Two connect are constituted as the resistance of divider resistance,
One end of the shelves resistance is connected with the output end of the corresponding shelves comparator, the other end and described two partial pressures electricity
The connecting pin of resistance is connected,
The overcurrent signal generation module contains as the comparator of overcurrent comparator and as signal pull-up resistor
Resistance,
The normal phase input end of the overcurrent comparator receives the overvoltage reference signal, negative-phase input from the connecting pin
Receive the current feedback signal from the current sampling module,
One end of the signal pull-up resistor is connected with the output end of the overcurrent comparator, and the other end receives high level electricity
Pressure,
The n is the positive integer not less than 2.
3. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, it is characterised in that:
Wherein, when the current feedback signal is overcurrent condition signal, the overcurrent signal is low level signal, is clamped
The switch control signal of position is low level signal, so that the transistor is in the closed state.
4. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, it is characterised in that:
Wherein, when the current feedback signal is shown as the working state signal, the overcurrent signal generation module is raw
At the high level signal as operating current signal.
5. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, it is characterised in that:
Wherein, when the cathode voltage is less than the reference voltage that first grade of comparator is received, the voltage point
Shelves judgment module exports the high level signal as operating voltage reference signal, and the overcurrent signal generation module generates conduct
The high level signal of operating current signal.
6. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, it is characterised in that:
Wherein, nominal operation electricity of the shelves reference voltage that first grade of comparator is received no more than the transistor
Pressure.
7. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, which is characterized in that further include:
Signal hysteresis module, it is sluggish for the overcurrent signal to occur,
Wherein, the signal hysteresis module have one as the diode of hysteresis diode and one as hysteresis resistance
Resistance,
The output end of the anode and the overcurrent comparator of the hysteresis diode, cathode are connected with one end of hysteresis resistance
It connects,
The other end of the hysteresis resistance is connected with the connecting pin.
8. the protection circuit of inverter according to claim 2 based on BUS voltage stepping, it is characterised in that:
Wherein, the number of the transistor in the inverter is m,
The number of the switch control signal is m,
The controller has m signal output end corresponding with the described transistor difference of m, is used for a switches of m
Control signal is provided correspondingly to the m transistors,
The clamper protective module contains m corresponding and mutually independent with the m signal output end difference as clamper
The diode of diode,
The anode of the m clamp diodes is connected with the output end of the overcurrent comparator, m two poles of clamper
Pipe cathode connects one to one with m signal output end,
The m is the positive integer not less than 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971708.4A CN110535100A (en) | 2019-10-14 | 2019-10-14 | Protection circuit of inverter based on BUS voltage stepping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971708.4A CN110535100A (en) | 2019-10-14 | 2019-10-14 | Protection circuit of inverter based on BUS voltage stepping |
Publications (1)
| Publication Number | Publication Date |
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| CN110535100A true CN110535100A (en) | 2019-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187035A (en) * | 2020-10-09 | 2021-01-05 | 山西暗石电子技术有限公司 | Soft start module based on MCU and electronic equipment |
| CN114280360A (en) * | 2021-12-24 | 2022-04-05 | 紫光展讯通信(惠州)有限公司 | Current measurement circuit and current measurement method |
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| CN114280360A (en) * | 2021-12-24 | 2022-04-05 | 紫光展讯通信(惠州)有限公司 | Current measurement circuit and current measurement method |
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