CN108448882A - A kind of anti-biasing circuit and method for inverter - Google Patents
A kind of anti-biasing circuit and method for inverter Download PDFInfo
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- CN108448882A CN108448882A CN201810189139.3A CN201810189139A CN108448882A CN 108448882 A CN108448882 A CN 108448882A CN 201810189139 A CN201810189139 A CN 201810189139A CN 108448882 A CN108448882 A CN 108448882A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/40—Means for preventing magnetic saturation
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of anti-biasing circuit and method for inverter, which includes：PWM module is configured as output to pulse synchronous signal and two original half-wave pulse-width signals；Whether comparison module, configuration determination inverter main transformer occur magnetic bias；PWM output control modules are configured to when magnetic bias occurs for inverter main transformer, and based on the comparison result that pulse synchronous signal and comparison module export, pwm control signal is exported to PWM module；PWM pulse-width regulated modules are configured to generate the anti-magnetic bias pulse-width signal for the pulsewidth that pulsewidth is more than original half-wave pulse-width signal, and export to the inverter circuit of inverter, to control the magnetic bias state of inverter.The present invention can inhibit main transformer magnetic bias state and realize overcurrent protection to main power tube.
Description
Technical field
The invention belongs to electronic power inversion power technique fields, specifically, more particularly to a kind of for inverter
Anti- biasing circuit and method.
Background technology
Inverter technology due to it is energy-efficient, small, light-weight, have excellent performance the features such as, in Arc Welding Power, straight
The fields such as stream regulated power supply, charger are widely used, it has also become the mainstream technology in current large power supply.Mesh
Before, most of large power supplies are all made of full-bridge or half-bridge converter main circuit realizes inversion transformation, typical circuit pattern
As shown in Figure 1.
Bridge circuit in the process of running, since pulsewidth modulation and circuit parameter can not possibly absolute symmetry be consistent, voltage wave
The reasons such as dynamic will cause its positive and negative half-wave voltage Flux consumption uneven.The imbalance of the Flux consumption will cause main transformer to run
There is magnetic bias in imbalance.When magnetic bias situation is serious, main transformer work will be caused to enter magnetic saturation region.Main transformer is saturated
It is equivalent to short-circuit condition, is sharply increased so as to cause the electric current for flowing through switching tube, the electric current for easily leading to flow through power tube is more than
Its allowable current makes its disabling damage.
One of the main reason for magnetic bias of bridge circuit is current inverter power tube damage.To improve inverter
Reliability, it is necessary to take measures to inhibit the generation of magnetic bias.Traditional theory thinks half-bridge converter circuit due to half-bridge capacitance
In the presence of having the effect of certain anti-magnetic bias, full-bridge type main circuit can also have certain anti-magnetic bias by capacitance of connecting
Effect.Really, half bridge circuit and the full bridge circuit for concatenating capacitance have the function of certain resistance magnetic bias, resist
The ability power of magnetic bias is directly related with its capacitance selection, and capacitance is smaller, and the effect of anti-magnetic bias is stronger.But capacitance is smaller,
Voltage drop is then bigger thereon, which transmits the efficient transformation for influencing inverter energy.Therefore, in the inversion of conventional design
In power supply, the selection of the capacitance is unsuitable too small.It, then can only be to slowly varying positive and negative half-wave Flux consumption if the capacitance is excessive
Imbalance can just play the effect of anti-magnetic bias；For change faster positive and negative half-wave Flux consumption it is unbalanced in the case of, such as arc
Power supply is welded, load variation is violent, to realize the control of power supply characteristic, is necessarily adjusted on a large scale by pulsewidth to realize.This
The large-scale pulsewidth of kind quickly adjusts the imbalance for the positive and negative half-wave Flux consumption for easily causing moment, to easily bridge-type be caused to become
The magnetic bias of circuit is changed, and the capacitance of bridge circuit is almost for the unbalanced inhibiting effect of fast-changing Flux consumption at this time
Zero.Practical application and experiment test show that the case where magnetic bias often occurs in the process of running in Arc Welding Power, so as to cause flowing through
The electric current of power tube increased dramatically.
Fig. 2 is primary current waveform when certain Arc Welding Power is run, hence it is evident that there are current spikes, to the peace of Arc Welding Power
Full reliably working is totally unfavorable, easily causes power tube overcurrent, damages power tube.Therefore, when occurring how magnetic bias effectively disappears
Except magnetic bias becomes the research hotspot of inverter technology.However, how to realize that the detection of online magnetic bias in real time is a problem, because
The detection of magnetic bias is on condition that will be detected the magnetic flux of the main transformer in Arc Welding Power, the direct magnetic flux of measurement main transformer
Change hardly possible.
The magnetic bias for measuring main transformer indirectly by primary current is a kind of feasible program.There is scholar to propose such as lower section
Case：Using transformer measurement main transformer primary current, when overcurrent occurs in primary side, power switch tube is closed to realize to work(
The protection of rate pipe.However, the program has two, first, the program cannot eliminate magnetic bias, next period is it is possible to go out
Existing magnetic bias；Second, closing power tube needs the regular hour, power tube is typically all to be driven by isolated drive circuit.
Typical case's driving for 100~200A IGBT, the turn-off time generally delay reach 1~2us, or even up to 2~3us.And as master
When transformer bias is more serious, the time delayed turn-off of 1~2us will be such that the primary current of main transformer sharply increases, and di/dt is up to several
Ten A/us.That is 1~2us time-delay closings, electric current will sharply increase tens amperes of even hundreds of amperes, and easily cause main work(
Rate pipe overcurrent damage.Therefore, if control circuit cannot inhibit main circuit magnetic bias, although can be to power in the period 1
Pipe is protected, but when next period magnetic bias depth further increases, and easily causes the damage of main power tube.Therefore, it is necessary to
When finding main transformer magnetic bias, effectively existing magnetic bias is corrected, reduces magnetic bias, controls the depth of its magnetic bias, in turn
It prevents power tube overcurrent and damages.
Invention content
In order to solve the above technical problem, the present invention provides a kind of anti-biasing circuit and method for inverter,
To inhibit main transformer magnetic bias state and realize overcurrent protection to main power tube.
According to an aspect of the invention, there is provided a kind of anti-biasing circuit for inverter, including：
PWM module is configured as output to pulse synchronous signal and two original half-wave pulsewidth tune of 180 ° of phase difference
Signal processed；
Comparison module, be configured to inverter main transformer primary current signal and predetermined voltage signals judge it is inverse
Whether variable power source main transformer occurs magnetic bias；
PWM output control modules are configured to, when magnetic bias occurs for inverter main transformer, be based on the impulsive synchronization
The comparison result of signal and comparison module output exports pwm control signal so that the PWM module to the PWM module
Stop exporting original half-wave pulse-width signal；
PWM pulse-width regulated modules are configured to the failing edge of the pwm control signal, next pulse synchronous signal
With next original half-wave pulse-width signal, the anti-magnetic bias that pulsewidth is more than the pulsewidth of the original half-wave pulse-width signal is generated
Pulse-width signal is simultaneously exported to the inverter circuit of inverter, to control the magnetic bias state of the inverter.
According to one embodiment of present invention, the PWM pulse-width regulateds module further comprises：
First trigger is configured to first input end and inputs the first original half-wave pulse-width signal, the second input terminal
Input the pulse synchronous signal, output end output the first triggering half-wave pulse-width signal；
Second trigger is configured to first input end and inputs the second original half-wave pulse-width signal, the second input terminal
Input the pulse synchronous signal, output end output the second triggering half-wave pulse-width signal；
Monostable sub-circuit, is configured to the failing edge signal of the pwm control signal, and output predetermined pulse width is monostable
Signal；
Third trigger, be configured to first input end input predetermined pulse width single steady signal, the second input terminal input described in
Pulse synchronous signal, output end export the monostable trigger signal of predetermined pulse width；
First and door, it is configured to first input end input the first triggering half-wave pulse-width signal, the second input
End inputs the predetermined pulse width single steady signal, first anti-magnetic bias pulse-width signal of the output end output with predetermined pulse width；
Second and door, it is configured to first input end input the second triggering half-wave pulse-width signal, the second input
End inputs the predetermined pulse width single steady signal, second anti-magnetic bias pulse-width signal of the output end output with predetermined pulse width.
According to one embodiment of present invention, the PWM output control modules further comprise：
4th trigger is configured to the comparison result that first input end inputs the comparison module output, the second input
End inputs the pulse synchronous signal, and output end exports the pwm control signal.
According to one embodiment of present invention, further include output module, including：
First or door, it is configured to first input end and inputs the first original half-wave pulse modulated signal, the second input
End inputs the predetermined pulse width single steady signal, and output end exports the first anti-magnetic bias pulse-width signal or the first original half-wave
Pulse-modulated signal；
Second or door, it is configured to first input end and inputs the second original half-wave pulse modulated signal, the second input
End inputs the predetermined pulse width single steady signal, and output end exports the second anti-magnetic bias pulse-width signal or the second original half-wave
Pulse-modulated signal.
According to one embodiment of present invention, further include isolation power driver module, be configured to input terminal and described the
One or door connected with the input terminal of described second or door, the connection of the input terminal of output end and inverter.
According to one embodiment of present invention, further include current acquisition module, be configured to acquisition inverter main transformer pressure
Device primary current signal.
According to one embodiment of present invention, the predetermined pulse width is equal to a half-wave pulsewidth tune in a pulse width modulation cycle
The maximum pulse width that signal processed reaches.
According to another aspect of the present invention, a kind of anti-bias magnetic method for inverter is additionally provided, including：
Acquire inverter main transformer primary current signal；
Judge that inverter main transformer is based on inverter main transformer primary current signal and predetermined voltage signals
No generation magnetic bias；
When magnetic bias occurs for inverter main transformer, in current half-wave pulse width period, stop exporting original half-wave arteries and veins
Wide modulated signal；
In next half-wave pulse width period, the failing edge, pulse synchronous signal based on the pwm control signal and original half
Wave pulse-width signal generates the anti-magnetic bias pulse-width signal that pulsewidth is more than the pulsewidth of original half-wave pulse-width signal, and
It exports to the inverter circuit of inverter, to control the magnetic bias state of inverter.
According to one embodiment of present invention, output pwm control signal to stop exporting original half-wave pulse-width signal,
Further comprise：
Based on pulse synchronous signal and magnetic bias as a result, generating pwm control signal；
The pwm control signal is sent to PWM module, stops exporting original half-wave pulsewidth to control the PWM module
Modulated signal.
According to one embodiment of present invention, the anti-magnetic bias that pulsewidth is more than the pulsewidth of original half-wave pulse-width signal is generated
Pulse-width signal further comprises：
In current half-wave pulse width period, when the failing edge of pwm control signal arrives, predetermined pulse width single steady signal is exported；
In next half-wave pulse width period, predetermined arteries and veins is generated according to the predetermined pulse width single steady signal and pulse synchronous signal
The monostable trigger signal of width, while the first triggering half-wave is generated according to the first original half-wave pulse-width signal and pulse synchronous signal
Pulse-width signal or the second original half-wave pulse-width signal and pulse synchronous signal generate the second triggering half-wave pulsewidth modulation
Signal；
The first anti-magnetic bias pulsewidth is generated according to the monostable trigger signal of predetermined pulse width and the first triggering half-wave pulse-width signal
Modulated signal, or the second anti-magnetic bias arteries and veins is generated according to the monostable trigger signal of predetermined pulse width and the second triggering half-wave pulse-width signal
Wide modulated signal.
Advantageous effect in the present invention：
The anti-biasing circuit and method for inverter provided through the invention, when detecting inverter main circuit
When magnetic bias occurs, it is momentarily turned off power tube, the excessive damage power tube of electric current can be prevented.Increase leading for power tube in next half-wave
The logical time, magnetic bias is enable to correct, to inhibit main transformer magnetic bias state and realize overcurrent protection to main power tube.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages can be by wanting in specification, right
Specifically noted structure is sought in book and attached drawing to realize and obtain.
Description of the drawings
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is full-bridge type and half bridge inverter circuit Structure Comparison schematic diagram in the prior art；
Primary side current of transformer comparison of wave shape when Fig. 2 is when Arc Welding Power works normally in the prior art and magnetic bias work
Schematic diagram；
Fig. 3 is a kind of desired voltage waveform schematic diagram；
Fig. 4 is the ideal transformer magnetic flux working state schematic representation of corresponding diagram 3；
Fig. 5 is the transformer bias working state schematic representation of corresponding diagram 3；
Fig. 6 is the anti-magnetic bias working state schematic representation of transformer according to an embodiment of the invention；
Fig. 7 is the anti-biasing circuit structural schematic diagram according to an embodiment of the invention for inverter；
Fig. 8 is the circuit work wave schematic diagram of corresponding diagram 7；
Fig. 9 is the anti-bias magnetic method flow chart according to an embodiment of the invention for inverter.
Specific implementation mode
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to be applied to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technique effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
It is formed by technical solution within protection scope of the present invention.
In ideal inverter, it is such as loaded into voltage waveform such as Fig. 3 of its transformer, then corresponding ideal main transformer magnetic
Working condition such as Fig. 4, magnetic flux work around origin symmetry；If magnetic bias occurs, magnetic working condition is as shown in figure 5, magnetic flux is put down
Weigh work centre point secundly.If continuing up deviation, transformer will make main transformer enter saturation due to magnetic bias.Main transformer
If depressor is saturated, the exciting current of primary side will sharply increase, and corresponding current waveform is as shown in Figure 2.From there through primary side electricity
Flow measurement, it is known that whether magnetic bias and its magnetic bias direction can be momentarily turned off power tube to main transformer after detecting magnetic bias overcurrent.
Meanwhile in order to correct magnetic bias, increase its turn-on time in next hemiwave time, magnetic bias can be enable to correct, as shown in Figure 6.
In figure 6, although 1 transformer of work period occurs magnetic bias, but its operating magnetic field flux is less than saturation flux, can also be just
Often work.With that is, positive half-wave in the work period 2, the Flux consumption of transformer forward direction excitation due to being adjusted etc. control circuit
Increase so that operating magnetic field flux increases and reach saturation, and primary side exciting current sharply increases.When control circuit is examined by primary current
When measuring magnetic bias, suitably increasing turn-on time in next negative half-wave makes operating magnetic field flux move down, and makes the magnetic work of transformer
Make state recovery, to achieve the effect that anti-magnetic bias.Currently, inverter is to be based on dedicated PWM chip (such as SG2525 mostly
Equal chips) realize PWM modulation control, it to realize above-mentioned control, then need to design the special above-mentioned function of auxiliary circuit realization.
Therefore, the present invention is based on existing PWM chips, provide a kind of anti-biasing circuit and method for inverter,
Its operation principle is：By detect main transformer primary current come judge main transformer whether magnetic bias and its magnetic bias direction, work as inspection
After measuring magnetic bias overcurrent, it is momentarily turned off power tube, while in order to correct magnetic bias, increases its turn-on time in next half-wave, made partially
Magnetic is corrected, to inhibit main transformer magnetic bias state and realize overcurrent protection to main power tube.
According to an aspect of the invention, there is provided a kind of anti-biasing circuit for inverter, as shown in fig. 7, packet
Include PWM module 11, comparison module 12, PWM output control modules 13 and PWM pulse-width regulateds module 14.
Wherein, PWM module 11 is configured as output to pulse synchronous signal and two original half-wave arteries and veins of 180 ° of phase difference
Wide modulated signal.Specifically, the chips such as SG2525 may be selected to send out PWM modulation signal in PWM module 11.PWM modulation signal packet
It includes P1 and the original half-wave signas of P2 two (original half-wave pulse-width signal), in a PWM cycle, sends out opposite in phase successively
Two original half-wave signas, P1 and P2 phases differ 180 °, and asynchronously export, referring to voltage pulse signal u in Fig. 6.
PWM module also exports a pulse synchronous signal, for the half-wave signa needed for synchronism output.
Comparison module 12 is configured to inverter main transformer primary current signal and predetermined voltage signals judge it is inverse
Whether variable power source main transformer occurs magnetic bias.Specifically, acquisition inverter main transformer primary current signal, and be converted
For voltage signal.Transformed voltage signal is compared with predetermined voltage, such as exceeds the range of predetermined voltage, then judges inverse
Magnetic bias occurs for variable power source main transformer.
PWM output control modules 13 are connect with PWM module 11 and comparison module 12, are configured in inverter main transformer
When magnetic bias occurs, based on the comparison result that pulse synchronous signal and comparison module 12 export, PWM controls are exported to PWM module 11
Signal, so that PWM module 11 stops exporting original half-wave pulse-width signal.Specifically, in the comparison exported by comparison module
When as a result learning generation magnetic bias, while when the output pulse synchronous signal of PWM module 11, PWM output control modules 13 export PWM controls
Signal processed.The pwm control signal can make PWM module 11 stop exporting original half-wave pulse-width signal.
PWM pulse-width regulateds module 14 is connect with PWM output control modules 13 and PWM module 11, is configured to PWM controls
The failing edge of signal processed, next pulse synchronous signal and next original half-wave pulse-width signal generate pulsewidth and are more than original half
The anti-magnetic bias pulse-width signal of the pulsewidth of wave pulse-width signal, and export to inverter inverter circuit (such as full-bridge or
Half bridge inverter circuit), to control the magnetic bias state of inverter.Specifically, being exported in PWM output control modules 13
When pwm control signal, PWM module 11 stops output half-wave signa.PWM module 11 normally exports pulse synchronous signal at this time,
At the end of the half-wave signa corresponds to pulse width time, PWM module 11 stops exporting corresponding pulse synchronous signal.PWM is exported at this time
Control module 13 also stops exporting pwm control signal, and when stopping exporting pwm control signal, the failing edge of pwm control signal arrives
Come.The failing edge of pwm control signal arrives when being arrived simultaneously with, next half-wave signa and next pulse synchronous signal, generates arteries and veins
It is wider than the anti-magnetic bias pulse-width signal of the pulsewidth of original half-wave pulse-width signal.
In the present invention, when detecting that magnetic bias occurs for inverter main circuit, it is momentarily turned off power tube, electricity can be prevented
Flow through big damage power tube.Increase the turn-on time of power tube in next half-wave, so that magnetic bias is corrected, to inhibit main transformer pressure
Device magnetic bias state and to main power tube realize overcurrent protection.
In one embodiment of the invention, PWM pulse-width regulateds module 14 further comprises the first trigger 141, second
Trigger 142, monostable sub-circuit 143, third trigger 144, first and door 145 and second and door 146, as shown in Figure 7.The
One trigger 141 is configured to first input end and inputs the first original half-wave pulse-width signal P1, the second input terminal input pulse
Synchronizing signal P, the first triggering half-wave of output end output pulse-width signal/P1.Second trigger 142 is configured to first input end
It inputs the second original half-wave pulsewidth modulation and believes No. P2, the second input terminal input pulse synchronizing signal P, the second triggering of output end output
Half-wave pulse-width signal/P2.Monostable sub-circuit 143 is configured to the failing edge signal of pwm control signal S2, and output is pre-
Determine pulsewidth single steady signal S3.Third trigger 144 is configured to first input end input predetermined pulse width single steady signal S3, the second input
Input pulse synchronizing signal P, output end is held to export the monostable trigger signal S4 of predetermined pulse width.First with door 145 to be configured to first defeated
Enter the first triggering half-wave of end input pulse-width signal/P1, the second input terminal inputs predetermined pulse width single steady signal S4, and output end is defeated
Provide the first anti-magnetic bias pulse-width signal //P1 of predetermined pulse width.Second is configured to first input end input the with door 146
Two triggering half-wave pulse-width signals/P2, the second input terminal input predetermined pulse width single steady signal S4, and output end output has predetermined
The second anti-magnetic bias pulse-width signal //P2 of pulsewidth.In synchronization, among the first trigger 141 and the second trigger 142,
Trigger sends out signal there are one only, and correspondingly, first is anti-there are one being exported with door among door 145 and second and door 146
Magnetic bias pulse-width signal.
In one embodiment of the invention, PWM output control modules 13 further comprise the 4th trigger 131, match
It is set to the comparison result that first input end input comparison module 12 exports, the second input terminal input pulse synchronizing signal P, output end
Export pwm control signal S2.
In one embodiment of the invention, which further includes output module 15, including first or door 151 and second or
Door 152.First or door 151 be configured to first input end and input the first original half-wave pulse modulated signal P1, the second input terminal is defeated
Enter predetermined pulse width single steady signal S4, output end exports the first anti-magnetic bias pulse-width signal/original half-wave pulse tune of/P1 or first
Signal P1 processed.Second or door 152 be configured to first input end and input the second original half-wave pulse modulated signal, the second input terminal is defeated
Enter predetermined pulse width single steady signal, output end exports the original half-wave pulse modulation of the second anti-magnetic bias pulse-width signal //P2 or second
Signal P2.Both anti-magnetic bias pulse-width signal and original half-wave pulse modulated signal signal amplitude are identical, only signal pulsewidth
Difference, the pulsewidth of anti-magnetic bias pulse-width signal are more than the pulsewidth of original half-wave pulse modulated signal, first or door 151 herein
It is with retention time longer signal in anti-magnetic bias pulse-width signal and original half-wave pulse modulated signal with second or door 152
Benchmark exports.
Due to practical measurement obtain the magnetic bias amount of inverter number it is more difficult, in one embodiment of the invention, will
Predetermined pulse width is equal to the maximum pulse width that a half-wave pulse-width signal reaches in a pulse width modulation cycle, i.e., one
The 45%-48% of PWM cycle.According to the maximum pulse width, the retention time of the steady-state signal of the output of monostable sub-circuit is set,
So that the pulsewidth of the predetermined pulse width single steady signal of the output of monostable sub-circuit is equal to the maximum pulse width, circuit can be simplified and set
It counts, is easier to realize in engineering.
In one embodiment of the invention, which further includes isolation power driver module 16, is configured to
Input terminal with first or door 151 and second or the input terminal of door 152 connect, the input terminal connection of output end and inverter.
In one embodiment of the invention, which further includes current acquisition module 17, is configured to acquire
Inverter main transformer primary current signal.
Comparison module 12 includes comparator 121, comparator 122, signal amplifier 123 and interlock circuit, for being based on
Inverter main transformer primary current signal and predetermined voltage signals judge whether inverter main transformer occurs magnetic bias.
When circuit work shown in Fig. 7, P is the pulse synchronous signal that SG2525 is generated, P1、P2For 180 DEG C of pulsewidth of difference
Modulated signal, unless under light condition, binary signal P1、P2Full pulsewidth state ,/P will not be generally operated in1,/P2For P1With P2Point
Do not merge the full pulse-width signal of 180 DEG C of difference generated, the turn-on time for increasing half-wave by rest-set flip-flop with P.If
For main primary side current of transformer signal, which is AC signal, passes through the comparison circuit of positive and negative threshold.When overcurrent occurs in electric current
When, make S1Send out pulse signal, S1With P signal by RS trigger circuits, work as S1When being high, even if S2For height, S2It can be used for immediately
The output of SG2525 is closed, namely closes main power tube.It is resetted by P signal at the end of this pulse width period, makes S2It sets low, terminates
Protection, by S2Failing edge trigger monostable circuit, generate with the single steady signal of fixed pulse width (tp).The pulsewidth will make when designing
It is slightly larger than the pulsewidth (td) of P signal, S3S is generated by rest-set flip-flop with P signal4Signal, S4Signal is in this period for opening
Logical/P1Or/P2Full pulse width signal is used to increase half-wave turn-on time, P signal is still as reset signal.It is tied when the period
Shu Hou resets S4Signal is allowed to set low, to shield/P1Or/P2Output close increase half-wave pulsewidth function, G1、G2For work(
The drive signal of the positive and negative half-wave of rate pipe after the binary signal is by being isolated power amplified drive circuit, drives half-bridge or full-bridge work(
The work of rate pipe, circuit each point waveform logic figure shown in Figure 8.
According to another aspect of the present invention, a kind of anti-bias magnetic method for inverter is additionally provided, as shown in Figure 9
According to the anti-bias magnetic method flow chart for inverter of one embodiment of the present of invention, to come to we below with reference to Fig. 9
Method is described in detail.
First, in step s 110, inverter main transformer primary current signal is acquired.It is adopted specifically, may be used
Collect the electric current that module 17 acquires inverter main transformer primary side.
In the step s 120, it is based on inverter main transformer primary current signal and predetermined voltage signals judges inversion electricity
Whether source main transformer occurs magnetic bias.Specifically, by inverter main transformer primary current signal IfVoltage signal is converted to,
The voltage signal and scheduled voltage signal (+12, -12) are compared, judge whether inverter main transformer occurs partially
Magnetic.
In step s 130, when magnetic bias occurs for inverter main transformer, in current half-wave pulse width period, stop defeated
Go out original half-wave pulse-width signal.Specifically, in output pwm control signal to stop exporting original half-wave pulse-width signal
When, pulse synchronous signal and magnetic bias are primarily based on as a result, generating pwm control signal.Then pwm control signal is sent to PWM
Module stops exporting original half-wave pulse-width signal to control PWM module.
In step S140, in next half-wave pulse width period, failing edge, impulsive synchronization letter based on pwm control signal
Number and original half-wave pulse-width signal, generate pulsewidth be more than original half-wave pulse-width signal pulsewidth anti-magnetic bias pulsewidth tune
Signal processed, and export to the inverter circuit of inverter, to control the magnetic bias state of inverter.Specifically, generating
When pulsewidth is more than the anti-magnetic bias pulse-width signal of the pulsewidth of original half-wave pulse-width signal, first, in current half-wave pulsewidth
In period, when the failing edge of pwm control signal arrives, predetermined pulse width single steady signal is exported.Then, in next half-wave pulse width period
It is interior, the monostable trigger signal of predetermined pulse width is generated according to predetermined pulse width single steady signal and pulse synchronous signal, while according to the first original
Beginning half-wave pulse-width signal and pulse synchronous signal generate the first triggering half-wave pulse-width signal or the second original half-wave arteries and veins
Wide modulated signal and pulse synchronous signal generate the second triggering half-wave pulse-width signal.Finally, it is touched according to predetermined pulse width is monostable
It signals and the first triggering half-wave pulse-width signal generates the first anti-magnetic bias pulse-width signal, or is monostable according to predetermined pulse width
Trigger signal and the second triggering half-wave pulse-width signal generate the second anti-magnetic bias pulse-width signal.By the first anti-magnetic bias pulsewidth
Modulated signal or the second anti-magnetic bias pulse-width signal are exported to the input terminal of inverter circuit.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not limited to the present invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But protection scope of the present invention still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of anti-biasing circuit for inverter, including：
PWM module is configured as output to pulse synchronous signal and two original half-wave pulsewidth modulations letters of 180 ° of phase difference
Number；
Comparison module, is configured to inverter main transformer primary current signal and predetermined voltage signals judge inversion electricity
Whether source main transformer occurs magnetic bias；
PWM output control modules are configured to, when magnetic bias occurs for inverter main transformer, be based on the pulse synchronous signal
With the comparison result of comparison module output, pwm control signal is exported to the PWM module so that the PWM module stops
Export original half-wave pulse-width signal；
PWM pulse-width regulated modules, be configured to the failing edge of the pwm control signal, next pulse synchronous signal and under
One original half-wave pulse-width signal generates the anti-magnetic bias pulsewidth that pulsewidth is more than the pulsewidth of the original half-wave pulse-width signal
Modulated signal is simultaneously exported to the inverter circuit of inverter, to control the magnetic bias state of the inverter.
2. anti-biasing circuit according to claim 1, which is characterized in that the PWM pulse-width regulateds module further comprises：
First trigger is configured to first input end and inputs the first original half-wave pulse-width signal, the input of the second input terminal
The pulse synchronous signal, output end output the first triggering half-wave pulse-width signal；
Second trigger is configured to first input end and inputs the second original half-wave pulse-width signal, the input of the second input terminal
The pulse synchronous signal, output end output the second triggering half-wave pulse-width signal；
Monostable sub-circuit is configured to the failing edge signal of the pwm control signal, exports the monostable letter of predetermined pulse width
Number；
Third trigger, is configured to first input end input predetermined pulse width single steady signal, and the second input terminal inputs the pulse
Synchronizing signal, output end export the monostable trigger signal of predetermined pulse width；
First and door, it is configured to first input end input the first triggering half-wave pulse-width signal, the second input terminal is defeated
Enter the predetermined pulse width single steady signal, first anti-magnetic bias pulse-width signal of the output end output with predetermined pulse width；
Second and door, it is configured to first input end input the second triggering half-wave pulse-width signal, the second input terminal is defeated
Enter the predetermined pulse width single steady signal, second anti-magnetic bias pulse-width signal of the output end output with predetermined pulse width.
3. anti-biasing circuit according to claim 2, which is characterized in that the PWM output control modules further comprise：
4th trigger, is configured to the comparison result that first input end inputs the comparison module output, and the second input terminal is defeated
Enter the pulse synchronous signal, output end exports the pwm control signal.
4. anti-biasing circuit according to claim 3, which is characterized in that further include output module, including：
First or door, it is configured to first input end and inputs the first original half-wave pulse modulated signal, the second input terminal is defeated
Enter the predetermined pulse width single steady signal, output end exports the first anti-magnetic bias pulse-width signal or the first original half-wave pulse
Modulated signal；
Second or door, it is configured to first input end and inputs the second original half-wave pulse modulated signal, the second input terminal is defeated
Enter the predetermined pulse width single steady signal, output end exports the second anti-magnetic bias pulse-width signal or the second original half-wave pulse
Modulated signal.
5. anti-biasing circuit according to claim 4, which is characterized in that further include isolation power driver module, configuration
For input terminal with described first or door and described second or the input terminal of door connect, the input terminal of output end and inverter connects
It connects.
6. anti-biasing circuit according to claim 1, which is characterized in that further include current acquisition module, be configured to adopt
Collect inverter main transformer primary current signal.
7. anti-biasing circuit according to claim 2, which is characterized in that the predetermined pulse width is equal to a pulse width modulation cycle
The maximum pulse width that an interior half-wave pulse-width signal reaches.
8. a kind of anti-bias magnetic method for inverter, including：
Acquire inverter main transformer primary current signal；
Judge whether inverter main transformer is sent out based on inverter main transformer primary current signal and predetermined voltage signals
Raw magnetic bias；
When magnetic bias occurs for inverter main transformer, in current half-wave pulse width period, stop exporting original half-wave pulsewidth tune
Signal processed；
In next half-wave pulse width period, the failing edge, pulse synchronous signal based on the pwm control signal and original half-wave arteries and veins
Wide modulated signal generates the anti-magnetic bias pulse-width signal that pulsewidth is more than the pulsewidth of original half-wave pulse-width signal, and exports
To the inverter circuit of inverter, to control the magnetic bias state of inverter.
9. according to the method described in claim 8, it is characterized in that, output pwm control signal is to stop exporting original half-wave arteries and veins
Wide modulated signal, further comprises：
Based on pulse synchronous signal and magnetic bias as a result, generating pwm control signal；
The pwm control signal is sent to PWM module, stops exporting original half-wave pulsewidth modulation to control the PWM module
Signal.
10. according to the method described in claim 9, it is characterized in that, generating pulsewidth is more than original half-wave pulse-width signal
The anti-magnetic bias pulse-width signal of pulsewidth, further comprises：
In current half-wave pulse width period, when the failing edge of pwm control signal arrives, predetermined pulse width single steady signal is exported；
In next half-wave pulse width period, predetermined pulse width list is generated according to the predetermined pulse width single steady signal and pulse synchronous signal
Steady trigger signal, while the first triggering half-wave pulsewidth is generated according to the first original half-wave pulse-width signal and pulse synchronous signal
Modulated signal or the second original half-wave pulse-width signal and pulse synchronous signal generate the second triggering half-wave pulsewidth modulation letter
Number；
The first anti-magnetic bias pulsewidth modulation is generated according to the monostable trigger signal of predetermined pulse width and the first triggering half-wave pulse-width signal
Signal, or the second anti-magnetic bias pulsewidth tune is generated according to the monostable trigger signal of predetermined pulse width and the second triggering half-wave pulse-width signal
Signal processed.
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| CN110912430A (en) * | 2019-11-23 | 2020-03-24 | 上海沪工焊接集团股份有限公司 | Method for improving magnetic bias of inverter transformer |
| CN112701937A (en) * | 2020-12-16 | 2021-04-23 | 河南海格经纬信息技术有限公司 | Method for inhibiting DC magnetic bias of DC converter transformer |
| WO2021259218A1 (en) * | 2020-06-23 | 2021-12-30 | 中兴通讯股份有限公司 | Pulse width compensation method and apparatus, storage medium, and electronic apparatus |
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| CN108448882B (en) | 2020-01-17 |
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