CN109546853A - The active PFC circuit and frequency changing driving system of Anti-surging - Google Patents
The active PFC circuit and frequency changing driving system of Anti-surging Download PDFInfo
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- CN109546853A CN109546853A CN201910003347.4A CN201910003347A CN109546853A CN 109546853 A CN109546853 A CN 109546853A CN 201910003347 A CN201910003347 A CN 201910003347A CN 109546853 A CN109546853 A CN 109546853A
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- 230000001629 suppression Effects 0.000 claims description 7
- 230000002265 prevention Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000009499 grossing Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
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Classifications
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- 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
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention provides the active PFC circuit and frequency changing driving system of a kind of Anti-surging, it include: the active PFC circuit for the input AC electricity through over commutation to be converted to the Anti-surging of DC bus-bar voltage, including PFC main circuit and the anti-surge circuit being parallel between PFC main circuit input terminal and output end；For converting DC bus-bar voltage to the inverter of output alternating current；The load operated by output exchange electric drive.The present invention protects active PFC circuit from the impact of surge voltage by the active PFC circuit of Anti-surging；Anti-surging device is protected when active PFC circuit works in uncontrollable rectifier mode simultaneously, avoids bearing high current and damage of generating heat for a long time, it is ensured that the validity of surging prevention, and then greatly promote the reliability of active PFC circuit；Meanwhile the power device in the rectifier of front end of the present invention, without the impact for bearing surge voltage, selection meets the device of normal design pressure voltage, effectively reduces device cost.
Description
Technical field
The present invention relates to circuit design fields, active PFC circuit and frequency conversion drive system more particularly to a kind of Anti-surging
System.
Background technique
In order to inhibit the generation of harmonic wave, while increase power factor, active PFC circuit are introduced into frequency changing driving system.
Due to the complicated multiplicity of the working environment of frequency changing driving system, have the characteristics that operation power is wide, frequency is high and the fluctuation of load is big, because
This, proposes very high requirement to the reliability of active PFC circuit.
Surge is that crossing for generation operates inside the overvoltage (overcurrent) that circuit generates when by being struck by lightning or electrical system
Voltage (overcurrent) is a kind of transition interference.If without restriction to surge will lead to various devices in system or device
Malfunction is even failed, this to reliability and the higher equipment of stability requirement particularly with active PFC circuit, directly facing
Power grid is more easier the damage for how preventing surge voltage (electric current) to device by surge impact, it is ensured that its circuit function has
Effect carries out, it has also become one of those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of active PFC of Anti-surging electricity
Road and frequency changing driving system have an impact stability, the reliability of active PFC circuit for solving surge voltage or electric current
Problem, while improving anti-surge circuit itself validity, reliability.
In order to achieve the above objects and other related objects, the present invention provides a kind of active PFC circuit of Anti-surging, described anti-
The active PFC circuit of surge includes at least:
PFC main circuit and anti-surge circuit, the PFC main circuit are booster circuit, and the anti-surge circuit is parallel to institute
It states between the input terminal and output end of PFC main circuit, and conduction voltage drop when anti-surge circuit conducting is greater than the PFC master
The conduction voltage drop of booster diode in circuit；
Wherein, the anti-surge circuit includes first diode, and the anode of the first diode connects the main electricity of PFC
The input terminal on road, the cathode of the first diode connect the output end of the PFC main circuit, the positive guide of first diode
It is logical, it is reversed to end.
Optionally, the first diode includes rectifier diode.
More optionally, the PFC main circuit includes reactor, power switch tube and the booster diode；
The first end of the reactor connects the input terminal of the PFC main circuit, and the second end of the reactor connects institute
The anode of booster diode is stated, the cathode of the booster diode connects the output end of the PFC main circuit；The power switch
Pipe is connected to the anode of the booster diode and with reference between ground；
The anti-surge circuit is parallel between the first end of the reactor and the cathode of the booster diode.
Optionally, the anti-surge circuit further includes the second diode；The anode of the first diode connects the PFC
The input terminal of main circuit, the cathode of the first diode connect the anode of second diode, second diode
Cathode connects the output end of the PFC main circuit；Or the anode of second diode connects the input of the PFC main circuit
End, the cathode of second diode connect the anode of the first diode, described in the cathode connection of the first diode
The output end of PFC main circuit；The sum of conduction voltage drop when the first diode and second diode current flow is greater than described
The conduction voltage drop of booster diode described in PFC main circuit.
More optionally, second diode includes rectifier diode, Transient Suppression Diode.
Optionally, the anti-surge circuit further includes third diode；The anode of the first diode connects the PFC
The input terminal of main circuit, the cathode of the first diode connect the cathode of the third diode, the third diode
Anode connects the output end of the PFC main circuit；Or the cathode of the third diode connects the input of the PFC main circuit
End, the anode of the third diode connect the anode of the first diode, described in the cathode connection of the first diode
The output end of PFC main circuit；The sum of conduction voltage drop when the first diode and the third diode current flow is greater than described
The conduction voltage drop of booster diode described in PFC main circuit；The third diode forward conducting, back clamping.
More optionally, the third diode includes Transient Suppression Diode.
Optionally, the anti-surge circuit further includes resistance；The anode of the first diode connects the PFC main circuit
Input terminal, the cathode of the first diode connects the first end of the resistance, and the second end of the resistance connects the PFC
The output end of main circuit；Or the first end of the resistance connects the input terminal of the PFC main circuit, the second end of the resistance
The anode of the first diode is connected, the cathode of the first diode connects the output end of the PFC main circuit；Described
The sum of conduction voltage drop when one diode and the resistance are connected is greater than the conducting of booster diode described in the PFC main circuit
Pressure drop.
More optionally, the resistance includes posive temperature coefficient thermistor.
In order to achieve the above objects and other related objects, the present invention also provides a kind of frequency changing driving system, the frequency conversion is driven
Dynamic system includes at least:
Rectifier, connection input AC electricity, for rectifying the input AC electricity；
The active PFC circuit of above-mentioned Anti-surging is connected to the output end of the rectifier, for will be through the input of over commutation
Alternating current is converted to DC bus-bar voltage；
Inverter is connected to the output end of the active PFC circuit of the Anti-surging, for turning the DC bus-bar voltage
Turn to output alternating current；
Load, is connected to the output end of the inverter, and the load is operated by the driving of the output alternating current.
As described above, the active PFC circuit and frequency changing driving system of Anti-surging of the invention, have the advantages that
The active PFC circuit and frequency changing driving system of Anti-surging of the invention protect active PFC electricity by anti-surge circuit
Impact of the road from surge voltage；Anti-surging device is protected when active PFC circuit works in uncontrollable rectifier mode simultaneously, is avoided
High current and damage of generating heat are born for a long time, it is ensured that the validity of surging prevention, and then greatly promote Anti-surging of the invention
Active PFC circuit and frequency changing driving system reliability and stability.
With the active PFC circuit of the Anti-surging of the invention, moreover it is possible to so that the power device in its front-end rectifier
It is effectively reduced without the impact for bearing surge voltage to need to only select the device for meeting normal design pressure voltage
Device cost.
Detailed description of the invention
Fig. 1 is shown as the structural schematic diagram of the first embodiment of the active PFC circuit of Anti-surging of the invention.
Fig. 2 is shown as the structural schematic diagram of second of embodiment of the active PFC circuit of Anti-surging of the invention.
Fig. 3 is shown as the structural schematic diagram of the third embodiment of the active PFC circuit of Anti-surging of the invention.
Fig. 4 is shown as the structural schematic diagram of the 4th kind of embodiment of the active PFC circuit of Anti-surging of the invention.
Fig. 5 is shown as the structural schematic diagram of frequency changing driving system of the invention.
Component label instructions
The active PFC circuit of 1 Anti-surging
11 PFC main circuits
12 anti-surge circuits
2 rectifiers
3 inverters
4 loads
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to FIG. 1 to FIG. 5.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of active PFC circuit 1 of Anti-surging, the active PFC electricity of the Anti-surging
Road 1 includes:
PFC main circuit 11 and anti-surge circuit 12, the PFC main circuit are booster circuit.
As shown in Figure 1, the PFC main circuit 11 is used to the alternating voltage through over commutation being converted to DC bus-bar voltage.
Specifically, in the present embodiment, the PFC main circuit 11 is one of booster circuit, specifically includes reactor
Lpfc, power switch tube S 1 and booster diode D1.One end of the reactor Lpfc connects the input of the PFC main circuit 11
Vi is held, the other end connects the anode of the booster diode D1, and the cathode of the booster diode D1 connects the PFC main circuit
11 output end vo, in the present embodiment, the output voltage of the PFC main circuit 11 is DC bus-bar voltage；The power
The collector of switching tube S1 connects the anode of the booster diode D1, and emitter connection connects drive module with reference to ground, gate pole
(not shown).
It should be noted that the PFC boost circuit of different topology structure can be selected as needed in actual use, such as
Staggered-parallel-type PFC boost circuit.
It should be noted that in the present embodiment, the power switch tube S 1 is insulated gate bipolar transistor；In reality
The type of the power switch tube S 1 can be set as needed in use, including but not limited to Metal-Oxide Semiconductor field is imitated
Transistor is answered, at this point, the drain electrode of the power switch tube S 1 connects the anode of the booster diode D1, source electrode connection reference
Ground, grid connect the drive module.
As shown in Figure 1, the anti-surge circuit 12 is parallel between the input terminal and output end of the PFC main circuit 11,
The conduction voltage drop when anti-surge circuit 12 is connected is greater than the conducting pressure of booster diode D1 described in the PFC main circuit 11
Drop.
Specifically, in the present embodiment, the anti-surge circuit 12 includes first diode D2；The first diode D2
Anode connect the input terminal of the PFC main circuit 12, the cathode of the first diode D2 connects the booster diode D1
Cathode, and the first diode D2 forward conduction is reversed to end.
It should be noted that in the present embodiment, the first diode D2 uses rectifier diode (Rectifier
Diode, RD).In practical applications, the first diode D2 includes but is not limited to rectifier diode, general-purpose diode, arbitrarily
The out-of-date conducting of electric current forward stream, cut-off when flowing counterflow through (can have a leakage current, but a leakage current very little, in cut-off when reversed
State) device be suitable for the present invention, be not limited to this embodiment.
It should be noted that in the present embodiment, the conduction voltage drop when anti-surge circuit 12 is connected is described the
The conduction voltage drop of one diode D2.
As a kind of implementation of the present embodiment, in the present embodiment, the active PFC circuit 1 of the Anti-surging is also wrapped
It includes the input terminal for being connected to the PFC main circuit 11 and with reference to the filter capacitor C1 between ground, is used for the PFC main circuit 11
The output voltage of front-end rectifier is filtered.
As a kind of implementation of the present embodiment, in the present embodiment, the active PFC circuit 1 of the Anti-surging is also wrapped
The output end for being connected to the PFC main circuit 11 is included and with reference to the smoothing capacity C2 between ground, for balancing input power and defeated
Power out.
It should be noted that in the present embodiment, the smoothing capacity C2 is a capacitor, in actual use, described
Smoothing capacity C2 can be the series and parallel or series-parallel of multiple capacitors, be not limited to this embodiment.
Specifically, when the PFC main circuit 11 works normally, the voltage of 11 input terminal of PFC main circuit is lower than defeated
The voltage of outlet, therefore the anti-surge circuit 12 is not turned on.When surge occurs, surge voltage makes the PFC main circuit
The voltage of 11 input terminals is higher than the voltage of output end, and the first diode D2 is connected, and often due to the PFC main circuit 11
The capacitance of input filtering capacitor C1 is much smaller than the capacitance of output end smoothing capacity C2, therefore the PFC main circuit when rule application
The voltage of 11 input terminals is clamped as the voltage of 11 output end of PFC main circuit, so protect the PFC main circuit 11 from
The impact of surge voltage.Also, also due to the voltage of 11 input terminal of PFC main circuit is clamped as the PFC main circuit
The voltage of 11 output ends so that power device in 11 front-end rectifier of PFC main circuit without bearing surge voltage and
Only it is subjected to the voltage of 11 output end of PFC main circuit, therefore the power in 11 front-end rectifier of PFC main circuit
The selection of device need to only meet normal design pressure voltage, without the specifications and models for selecting that there is more high voltage value, thus
Effectively reduce device cost.When the PFC main circuit 11 is in the uncontrollable rectifier operating mode (power switch tube S 1 not work
Make, and the PFC main circuit 11 still has voltage input and output) when, conducting pressure when due to first diode D2 conducting
(frequency is power frequency, the reactor Lpfc to conduction voltage drop of the drop greater than the booster diode D1 when uncontrollable rectifier operating mode
It is equivalent to conducting wire, therefore the pressure drop at the both ends the reactor Lpfc can be ignored), then most of stream in the power current inputted
Through the booster diode D1, and fraction flows through the first diode D2, thus when avoiding the first diode D2 long
Between bear high current and damage of generating heat, lose the effect of Anti-surging.
Embodiment two
As shown in Fig. 2, existing the present embodiment provides a kind of active PFC circuit 1 of Anti-surging with the difference of embodiment one
In the anti-surge circuit 12 further includes the second diode D3.
Specifically, the anti-surge circuit 12 includes first diode D2 and the second diode D3；The first diode
The anode of D2 connects the input terminal of the PFC main circuit 11, and the cathode of the first diode D2 connects second diode
The cathode of the anode of D3, the second diode D3 connects the output end of the PFC main circuit 11.The anti-surge circuit 12
Conduction voltage drop is the first diode D2 and the sum of conduction voltage drop when the second diode D3 is both turned on, and described first
The sum of conduction voltage drop when diode D2 and the second diode D3 are both turned on is greater than boosting described in the PFC main circuit 11
The conduction voltage drop of diode D1, but the conduction voltage drop of second diode of the first diode D2 or described D3 is smaller than the liter
Press the conduction voltage drop of diode D1.
It should be noted that in the present embodiment, the second diode D3 uses rectifier diode, in practical application
In, the second diode D3 includes but is not limited to rectifier diode, Transient Suppression Diode (Transient Voltage
Suppressor, TVS), general-purpose diode, the device of any out-of-date conducting of electric current forward stream is suitable for the present invention, not with this
Embodiment is limited.
It should be noted that the position of the second diode D3 and the first diode D2 are interchangeable, with concatenated
Mode connects, i.e., the anode of the described second diode D3 connects the input terminal of the PFC main circuit 11, the two or two pole
The cathode of pipe D3 connects the anode of the first diode D2, and the cathode of the first diode D2 connects the PFC main circuit
11 output end.
It should be noted that in practical applications, can also connect one or more two poles in the anti-surge circuit 12
Pipe (device of any out-of-date conducting of electric current forward stream is applicable in), each diode is sequentially connected in series, and connection relationship can be according to this reality
The first diode D2 and the second diode D3 for applying example analogize to obtain, and will not repeat them here.
Specifically, referring to the working principle of above-described embodiment one, when surge occurs, surge voltage makes the described 1st
Pole pipe D2 and the second diode D3 are both turned on, and the voltage of 11 input terminal of PFC main circuit is clamped as the main electricity of the PFC
The voltage of 11 output end of road, and then protect the PFC main circuit 11 from the impact of surge voltage.And work as the PFC main circuit
11 when being in uncontrollable rectifier operating mode, conducting when being both turned on due to the first diode D2 and the second diode D3
The sum of pressure drop is greater than the conduction voltage drop of the booster diode D1, then the major part in power current inputted flows through the boosting
Diode D1, and fraction flows through the first diode D2 and the second diode D3, to avoid the one or two pole
Pipe D2 and the second diode D3 bear high current and damage of generating heat for a long time, lose the effect of Anti-surging.
Embodiment three
As shown in figure 3, existing the present embodiment provides a kind of active PFC circuit 1 of Anti-surging with the difference of embodiment one
In the anti-surge circuit 12 further includes third diode D4.
Specifically, the anti-surge circuit 12 includes first diode D2 and third diode D4；The first diode
The anode of D2 connects the input terminal of the PFC main circuit 11, and the cathode of the first diode D2 connects the third diode
The anode of the cathode of D4, the third diode D4 connects the output end of the PFC main circuit 11.The anti-surge circuit 12
Conduction voltage drop is the first diode D2 and the sum of the conduction voltage drop when third diode D4 is both turned on, and described first
The sum of conduction voltage drop when diode D2 and the third diode D4 are both turned on is greater than boosting described in the PFC main circuit 11
The conduction voltage drop of diode D1, but the conduction voltage drop of the first diode D2 or the third diode D4 be smaller than it is described
The conduction voltage drop of booster diode D1 described in PFC main circuit 11.
It should be noted that in the present embodiment, the third diode D4 uses Transient Suppression Diode.Actually answering
In, the third diode D4 includes but is not limited to unidirectional Transient Suppression Diode, two-way Transient Suppression Diode, any electricity
The out-of-date conducting of forward stream is flowed, both end voltage clamp is suitable for the present invention in the device of a predetermined value when electric current flows counterflow through,
It is not limited to this embodiment.
It should be noted that in the present embodiment, the conduction voltage drop of the third diode D4 refers to the three or two pole
The reverse turn-on voltages of pipe D4, i.e. clamp voltage.
It should be noted that the position of the third diode D4 and the first diode D2 are interchangeable, with concatenated
Mode connects, i.e., the cathode of the described third diode D4 connects the input terminal of the PFC main circuit 11, the three or two pole
The anode of pipe D4 connects the anode of the first diode D2, and the cathode of the first diode D2 connects the PFC main circuit
11 output end.
It should be noted that the quantity of the first diode D2 and third diode D4 may include it is multiple, with string
The mode of connection connects, and sequence is unlimited, will not repeat them here.
Specifically, referring to the working principle of above-described embodiment one, when surge occurs, surge voltage makes the described 1st
Pole pipe D2 and the third diode D4 are both turned on, and the voltage of 11 input terminal of PFC main circuit is clamped as the main electricity of the PFC
The sum of voltage and the clamp voltage (generally a few~tens volts of volts) of third diode D4 of 11 output end of road, and then described in protection
Impact of the PFC main circuit 11 from surge voltage.And when the PFC main circuit 11 is in the operating mode of uncontrollable rectifier, by
The conduction voltage drop of the booster diode D1, thus the first diode D2 are much larger than in the clamp voltage of third diode D4
Conduction voltage drop of the sum of conduction voltage drop when being both turned on the third diode D4 also much larger than the booster diode D1, then
The overwhelming majority in the power current of input flows through the booster diode D1, and only very little part flows through the one or two pole
The pipe D2 and third diode D4, so that it is big to avoid the first diode D2 and third diode D4 from bearing for a long time
Electric current and damage of generating heat, lose the effect of Anti-surging, and then can ensure that the validity of surging prevention, improve circuit reliability.
Example IV
As shown in figure 4, existing the present embodiment provides a kind of active PFC circuit 1 of Anti-surging with the difference of embodiment one
In the anti-surge circuit 12 further includes resistance R.
Specifically, the anti-surge circuit 12 includes first diode D2 and resistance R；The anode of the first diode D2
The input terminal of the PFC main circuit 11 is connected, the cathode of the first diode D2 connects one end of the resistance R, the electricity
The other end of resistance R connects the output end of the PFC main circuit 11.The conduction voltage drop when anti-surge circuit 12 is connected is institute
The sum of conduction voltage drop when first diode D2 and resistance R is both turned on is stated, the first diode D2 and resistance R's
The sum of conduction voltage drop is greater than the conduction voltage drop of booster diode D1 described in the PFC main circuit, but the first diode D2
Or the conduction voltage drop of the resistance R is smaller than the conduction voltage drop of booster diode D1 described in the PFC main circuit 11.
It should be noted that in the present embodiment, the resistance R uses posive temperature coefficient thermistor (Positive
Temperature Coefficient, PTC).In practical applications, the resistance R includes but is not limited to conventional, electric-resistance, positive temperature
Coefficient resistance is spent, is arbitrarily able to bear certain power, electric current flows through can generate the device of pressure drop and be suitable for the present invention,
It is not limited to this embodiment.
It should be noted that the position of the first diode D2 and the resistance R are interchangeable, it is connected in series to
, i.e., one end of the described resistance R connects the input terminal of the PFC main circuit 11, the other end connection of the resistance R described the
The anode of one diode D2, the cathode of the first diode D2 connect the output end of the PFC main circuit 11.
It should be noted that the quantity of the first diode D2 and resistance R may include it is multiple, in series
Connection, sequence is unlimited, will not repeat them here.
Specifically, referring to the working principle of above-described embodiment one, when surge occurs, surge voltage makes the described 1st
Pole pipe D2 conducting, the voltage of 11 input terminal of PFC main circuit are clamped as the voltage of 11 output end of PFC main circuit, into
And protect the PFC main circuit 11 from the impact of surge voltage.And when the PFC main circuit 11 is in the work of uncontrollable rectifier
When mode, for conventional, electric-resistance, having electric current to flow through can produce pressure drop, and the resistance value of conventional, electric-resistance can be fitted according to design parameter
When selection, guarantee that the sum of pressure drop of the first diode D2 and resistance R is greater than two poles of the boosting when uncontrollable rectifier
The pressure drop of pipe D1, at this point, the major part in the power current of input flows through the booster diode D1, and fraction flows through
The first diode D2 and resistance R, so that the first diode D2 and resistance R be avoided to bear big electricity for a long time
It flows and damage of generating heat；For posive temperature coefficient thermistor, due to posive temperature coefficient thermistor when temperature is higher resistance value
Bigger, after the first diode D2 conducting, the resistance R bears electric current and then generating heat causes its resistance value to become larger, then the electricity
Resistance R pressure drop become larger, so that the first diode D2 and the sum of the pressure drop of the resistance R is become larger, the first diode D2 and
The current reduction that the resistance R is born, the then major part in power current inputted flow through the booster diode D1, and small portion
Shunt through the first diode D2 and resistance R, thus avoid the first diode D2 from bearing high current for a long time and
Fever damage, loses the effect of Anti-surging, and then can ensure that the validity of surging prevention, improves circuit reliability.
Embodiment five
As shown in figure 5, the present embodiment provides a kind of frequency changing driving system, the frequency changing driving system includes:
Rectifier 2, the active PFC circuit 1 of Anti-surging, inverter 3 and load 4.
As shown in figure 5, the rectifier 2 receives input AC electricity Vac, the input AC electricity Vac is rectified.
Specifically, in the present embodiment, the input terminal of the rectifier 2 is separately connected the fire of the input AC electricity Vac
Line L and zero curve N, the rectifier 2 include four diodes, and four diodes constitute rectifier bridge structure.
As shown in figure 5, the active PFC circuit 1 of the Anti-surging, is connected to the output end of the rectifier 2, for will be through
Input AC electricity Vac after rectification is converted to DC bus-bar voltage.
Specifically, the structure of the active PFC circuit 1 of the Anti-surging can be used any one in one~example IV of embodiment
Kind, it will not repeat them here.
As shown in figure 5, the inverter 3 is connected to the output end of the active PFC circuit 1 of the Anti-surging, it is used for institute
It states DC bus-bar voltage and is converted into output alternating current.
Specifically, the structure of the inverter 3 can select any one structure as needed, be not limited to this embodiment.
In the present embodiment, the inverter 3 includes six power switch tubes, constitutes three phase inverter bridge, and specific structure is herein not one by one
It repeats.In the present embodiment, each power switch tube is insulated gate bipolar transistor in the inverter 3, in actual use
The type of each power switch tube can be set as needed.The three-phase output end of the inverter circuit 3 connects the three-phase of the load 4
Input terminal.
As shown in figure 5, the load 4 is connected to the output end of the inverter 3, the load 4 is exchanged by the output
The driving operating of electricity.
Specifically, in the present embodiment, the load 4 is three-phase motor, when threephase stator winding (each difference of motor
120 degree of electrical angles) be passed through output alternating current after, a rotating excitation field will be generated, the rotating excitation field cutting rotor winding, thus
Induced current is generated in rotor windings.
It should be noted that in actual use, the load 4 includes but is not limited to that monophase machine or other electricity consumptions are set
Standby, the structure of the inverter 3 makes the modification of adaptability, will not repeat them here.
With the active PFC circuit 1 of the Anti-surging of the invention, by by the PFC main circuit 11 when surge occurs
The voltage of input terminal is clamped as the voltage of 11 output end of PFC main circuit, so that the power device in the rectifier 2
It is only subjected to the voltage of 1 output end of active PFC circuit of the Anti-surging without surge voltage is subjected to, therefore described whole
The selection of power device in stream device 2 need to only meet normal design pressure voltage, without selecting have more high voltage value
Specifications and models, to effectively reduce device cost.
It is various that the frequency changing driving system of the present embodiment can be used for household electrical appliance (such as convertible frequency air-conditioner), industrial current transformer etc.
Applied power electronics field.
Active PFC circuit 1 based on the Anti-surging, the frequency changing driving system of the present embodiment be greatly improved stability and
Reliability.
In conclusion the present invention provides the active PFC circuit and frequency changing driving system of a kind of Anti-surging, comprising: Anti-surging
Active PFC circuit, for the input AC electricity through over commutation to be converted to DC bus-bar voltage, wherein Anti-surging it is active
Pfc circuit includes PFC main circuit and anti-surge circuit, and the anti-surge circuit is parallel to the input and output of the PFC main circuit
Between end；Inverter is connected to the output end of the active PFC circuit of the Anti-surging, for turning the DC bus-bar voltage
Turn to output alternating current；Load, is connected to the output end of the inverter, and the load is transported by the driving of the output alternating current
Turn.The active PFC circuit of Anti-surging of the invention and frequency changing driving system by anti-surge circuit protect active PFC circuit from
The impact of surge voltage；Anti-surging device is protected when active PFC circuit works in uncontrollable rectifier mode simultaneously, is avoided for a long time
Bear high current and damage of generating heat, it is ensured that the validity of surging prevention, and then greatly promote the active of Anti-surging of the invention
The reliability of pfc circuit and frequency changing driving system.Meanwhile it can also make with the active PFC circuit of the Anti-surging of the invention
Power device in its front-end rectifier without bearing the impact of surge voltage, to need to only select to meet normal design resistance to
The device of pressure value, effectively reduces device cost.So the present invention effectively overcome various shortcoming in the prior art and
Has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of active PFC circuit of Anti-surging, which is characterized in that the active PFC circuit of the Anti-surging includes at least:
PFC main circuit and anti-surge circuit, the PFC main circuit are booster circuit, and the anti-surge circuit is parallel to the PFC
Between the input terminal and output end of main circuit, and conduction voltage drop when anti-surge circuit conducting is greater than the PFC main circuit
The conduction voltage drop of middle booster diode；
Wherein, the anti-surge circuit includes first diode, and the anode of the first diode connects the PFC main circuit
Input terminal, the cathode of the first diode connect the output end of the PFC main circuit, the first diode forward conduction,
Reversed cut-off.
2. the active PFC circuit of Anti-surging according to claim 1, it is characterised in that: the first diode includes whole
Flow diode.
3. the active PFC circuit of Anti-surging according to claim 1, it is characterised in that: the PFC main circuit includes reactance
Device, power switch tube and the booster diode；
The first end of the reactor connects the input terminal of the PFC main circuit, and the second end of the reactor connects the liter
The anode of diode is pressed, the cathode of the booster diode connects the output end of the PFC main circuit；The power switch tube connects
It is connected to the anode of the booster diode and with reference between ground；
The anti-surge circuit is parallel between the first end of the reactor and the cathode of the booster diode.
4. the active PFC circuit of Anti-surging according to claim 1, it is characterised in that: the anti-surge circuit further includes
Second diode；The anode of the first diode connects the input terminal of the PFC main circuit, the cathode of the first diode
The anode of second diode is connected, the cathode of second diode connects the output end of the PFC main circuit；Or institute
The anode for stating the second diode connects the input terminal of the PFC main circuit, the cathode connection described first of second diode
The anode of diode, the cathode of the first diode connect the output end of the PFC main circuit；The first diode and institute
The sum of conduction voltage drop when stating the second diode current flow is greater than the conduction voltage drop of booster diode described in the PFC main circuit.
5. the active PFC circuit of Anti-surging according to claim 4, it is characterised in that: second diode includes whole
Flow diode, Transient Suppression Diode.
6. the active PFC circuit of Anti-surging according to claim 1, it is characterised in that: the anti-surge circuit further includes
Third diode；The anode of the first diode connects the input terminal of the PFC main circuit, the cathode of the first diode
The cathode of the third diode is connected, the anode of the third diode connects the output end of the PFC main circuit；Or institute
The cathode for stating third diode connects the input terminal of the PFC main circuit, the anode connection described first of the third diode
The anode of diode, the cathode of the first diode connect the output end of the PFC main circuit；The first diode and institute
The sum of conduction voltage drop when stating third diode current flow is greater than the conduction voltage drop of booster diode described in the PFC main circuit；
The third diode forward conducting, back clamping.
7. the active PFC circuit of Anti-surging according to claim 6, it is characterised in that: the third diode includes wink
State inhibits diode.
8. the active PFC circuit of Anti-surging according to claim 1, it is characterised in that: the anti-surge circuit further includes
Resistance；The anode of the first diode connects the input terminal of the PFC main circuit, and the cathode of the first diode connects institute
The first end of resistance is stated, the second end of the resistance connects the output end of the PFC main circuit；Or the first end of the resistance
Connecting the input terminal of the PFC main circuit, the second end of the resistance connects the anode of the first diode, and the described 1st
The cathode of pole pipe connects the output end of the PFC main circuit；The conduction voltage drop when first diode and the resistance are connected
The sum of be greater than the PFC main circuit described in booster diode conduction voltage drop.
9. the active PFC circuit of Anti-surging according to claim 8, it is characterised in that: the resistance includes positive temperature system
Number thermistor.
10. a kind of frequency changing driving system, which is characterized in that the frequency changing driving system includes at least:
Rectifier, connection input AC electricity, for rectifying the input AC electricity；
The active PFC circuit of Anti-surging as claimed in any one of claims 1 to 9 wherein, is connected to the output end of the rectifier,
For the input AC electricity through over commutation to be converted to DC bus-bar voltage；
Inverter is connected to the output end of the active PFC circuit of the Anti-surging, for converting the DC bus-bar voltage to
Export alternating current；
Load, is connected to the output end of the inverter, and the load is operated by the driving of the output alternating current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910003347.4A CN109546853A (en) | 2019-01-03 | 2019-01-03 | The active PFC circuit and frequency changing driving system of Anti-surging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910003347.4A CN109546853A (en) | 2019-01-03 | 2019-01-03 | The active PFC circuit and frequency changing driving system of Anti-surging |
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| CN109546853A true CN109546853A (en) | 2019-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910003347.4A Pending CN109546853A (en) | 2019-01-03 | 2019-01-03 | The active PFC circuit and frequency changing driving system of Anti-surging |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112104213A (en) * | 2020-07-26 | 2020-12-18 | 南京博兰得电能技术发展有限公司 | Surge current suppression circuit |
| CN113676028A (en) * | 2020-05-13 | 2021-11-19 | 海信（山东）空调有限公司 | PFC protection circuit and frequency conversion equipment |
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| CN103516185A (en) * | 2012-06-27 | 2014-01-15 | 艾默生网络能源有限公司 | BOOST converter and differential mode prevention surge protection circuit thereof |
| CN205029555U (en) * | 2015-06-03 | 2016-02-10 | 中兴通讯股份有限公司 | Carbonization silicon diode antisurge device |
| CN209267441U (en) * | 2019-01-03 | 2019-08-16 | 浙江鲲悟科技有限公司 | The active PFC circuit and frequency changing driving system of Anti-surging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516185A (en) * | 2012-06-27 | 2014-01-15 | 艾默生网络能源有限公司 | BOOST converter and differential mode prevention surge protection circuit thereof |
| CN205029555U (en) * | 2015-06-03 | 2016-02-10 | 中兴通讯股份有限公司 | Carbonization silicon diode antisurge device |
| WO2016192448A1 (en) * | 2015-06-03 | 2016-12-08 | 中兴通讯股份有限公司 | Silicon carbide diode anti-surge apparatus |
| CN209267441U (en) * | 2019-01-03 | 2019-08-16 | 浙江鲲悟科技有限公司 | The active PFC circuit and frequency changing driving system of Anti-surging |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113676028A (en) * | 2020-05-13 | 2021-11-19 | 海信（山东）空调有限公司 | PFC protection circuit and frequency conversion equipment |
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