CN105991020A - Power factor correction rectifier and uninterrupted power supply - Google Patents
Power factor correction rectifier and uninterrupted power supply Download PDFInfo
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- CN105991020A CN105991020A CN201510051349.2A CN201510051349A CN105991020A CN 105991020 A CN105991020 A CN 105991020A CN 201510051349 A CN201510051349 A CN 201510051349A CN 105991020 A CN105991020 A CN 105991020A
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Abstract
Embodiments of the invention provide a PFC (Power Factor Correction) rectifier and an uninterrupted power supply. The problem of electromagnetic interference to a rectifier circuit is solved using capacitors. Moreover, the efficiency of the PFC rectifier is improved, the cost is lowered, and the size of the PFC rectifier is reduced. The PFC rectifier comprises a PFC rectification circuit and at least one filter capacitor. One end of each filter capacitor is connected to the connecting point of a power-frequency switch unit and a high-frequency switch unit in the PFC rectification circuit. For each filter capacitor, the other end of the filter capacitor is connected between a first PFC inductor and the positive electrode of a direct-current power supply powering the PFC rectifier, wherein the first PFC inductor is one PFC inductor in the PFC rectification circuit, and a second PFC inductor is the other PFC inductor in the PFC rectification circuit.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of power factor corrective rectifier and not between
Power-off source.
Background technology
PFC in on-line uninterruption power supply (UPS, Uninterruptible Power Supply)
(PFC, Power Factor Correction) rectification circuit is the most as far as possible by AC/DC changer
With DC/DC changer common sparing device, to reduce the purpose of cost.But, use monocell
The PFC rectification circuit of group, the problem that the most all there is electromagnetic interference.
The three-phase PFC rectification circuit using monocell group shown in Fig. 1 is operated under battery mode, switch
K1 connects the positive pole of set of cells DC, and when positive bus-bar electric capacity C1 energy storage, switching tube Q2 turns on, switching tube
Q1 high frequency chopping, when switching tube Q1 turns on, set of cells DC, inductance L1, switching tube Q1, switch
Pipe Q2, inductance L2 constitute tank circuit, charge to inductance L1 and inductance L2；Now, set of cells DC
The current potential of negative pole be-V_DC/2, wherein, V_DC is the voltage of set of cells DC；At switching tube Q1
During shutoff, set of cells DC, inductance L1, diode D3, positive bus-bar electric capacity C1, switching tube Q2, electricity
Sense L2 constitutes continuous current circuit, and inductance L1 and inductance L2 releases energy, positive bus-bar electric capacity C1 energy storage；This
Time, the current potential of the negative pole of set of cells DC is (V_BUS-V_DC)/2, and wherein, V_BUS is shown in Fig. 1
PFC rectification circuit positive bus-bar outfan BUS+ voltage and negative busbar outfan BUS-voltage it
Difference.
The three-phase PFC rectification circuit using monocell group shown in Fig. 1 switchs K1 under battery mode and connects electricity
The positive pole of pond group DC, when negative busbar electric capacity C2 energy storage, switching tube Q1 normal open, switching tube Q2 high frequency
Copped wave, when switching tube Q2 turns on, set of cells DC, inductance L1, switching tube Q1, switching tube Q2,
Inductance L2 constitutes tank circuit, charges to inductance L1 and inductance L2；Now, the negative pole of set of cells DC
Current potential be-V_DC/2, wherein, V_DC is the voltage of set of cells DC；When switching tube Q2 turns off,
Set of cells DC, inductance L1, switching tube Q1, negative busbar electric capacity C2, diode D4, inductance L2 are constituted
Continuous current circuit, inductance L1 and inductance L2 release energy, negative busbar electric capacity C2 energy storage；Now, set of cells
The current potential of the negative pole of DC is-(V_BUS+V_DC)/2.
It is to say, when the PFC rectification circuit shown in Fig. 1 is operated under battery mode, be just either
During bus capacitor energy storage, or during being negative busbar capacitance energy storage, the electricity of the negative pole of set of cells
Position is all in high frequency saltus step, and this can connect at the negative pole of the electric capacity C4 that the positive pole of set of cells connects and set of cells
Form the strongest high frequency common mode current on electric capacity C3, thus form electromagnetic interference.
The problem forming electromagnetic interference, mesh it is operated under battery mode for the PFC rectification circuit shown in Fig. 1
Front a solution is as shown in Figure 2.
PFC rectification circuit shown in Fig. 2 switchs K1 under battery mode and connects the positive pole of set of cells DC,
During positive bus-bar electric capacity C1 energy storage, switching tube Q2 turns on, and switching tube Q1 high frequency chopping, at switching tube Q1
During conducting, set of cells DC, inductance L1, switching tube Q1, switching tube Q2, inductance L2 constitute energy storage and return
Road, charges to inductance L1 and inductance L2；Meanwhile, diode D6, switching tube Q2 and inductance L2 are constituted
Loop；And when switching tube Q1 turns off, set of cells DC, inductance L1, diode D3, positive bus-bar electric capacity
C1, switching tube Q2, inductance L2 constitute continuous current circuit, inductance L1 and inductance L2 and release energy, just female
Line capacitance C1 energy storage；Meanwhile, diode D6, switching tube Q2 and inductance L2 also constitute loop；Just
During bus capacitor C1 energy storage, driving signal VGS1, the driving of switching tube Q2 of switching tube Q1
Electric current IL1 on signal VGS2, inductance L1, the electric current ID4 on diode D6 and inductance L2
On electric current IL2 as it is shown on figure 3, as can be seen from Figure 3 during positive bus-bar electric capacity C1 energy storage,
Diode D6 can flow through all of ripple current, the basic normal open of diode D6 or slight zero current certainly
So turning off, owing to the electric current on inductance L2 is basically unchanged, therefore inductance L2 is equivalent to a section lead, due to
Q2 turns on, and therefore, the current potential of the negative pole of set of cells DC is the current potential of the zero line N of alternating current power supply AC,
Saltus step will not occur.
PFC rectification circuit shown in Fig. 2 switchs K1 under battery mode and connects the positive pole of set of cells DC,
During negative busbar electric capacity C2 energy storage, switching tube Q1 turns on, and switching tube Q2 high frequency chopping, at switching tube Q2
During conducting, set of cells DC, inductance L1, switching tube Q1, switching tube Q2, inductance L2 constitute energy storage and return
Road, charges to inductance L1 and inductance L2；Meanwhile, diode D5, inductance L1 and switching tube Q1 are constituted
Loop；And when switching tube Q2 turns off, set of cells DC, inductance L1, switching tube Q1, negative busbar electric capacity
C2, diode D4, inductance L2 constitute continuous current circuit, inductance L1 and inductance L2 and release energy, negative mother
Line capacitance C2 energy storage；Meanwhile, diode D5, inductance L1 and switching tube Q1 constitute loop；Similarly,
During negative busbar electric capacity C2 energy storage, diode D5 can flow through all of ripple current, diode
The basic normal open of D5 or slight zero current turn off naturally, owing to the electric current on inductance L1 is basically unchanged, because of
This inductance L1 is equivalent to a section lead, and owing to Q1 turns on, therefore, the current potential of the positive pole of set of cells DC is
The current potential of the zero line N of alternating current power supply AC, will not occur saltus step.
As can be seen here, the PFC rectification circuit shown in Fig. 2 can reduce electromagnetic interference, but, for positive female
During line capacitance C1 energy storage, diode D6 needs radiator, and switching tube Q2 and inductance L2
The electric current flow through always is peak point current, this conduction loss making switching tube Q2 and the copper of inductance L2
Consume the biggest；And during for negative busbar electric capacity C2 energy storage, diode D5 needs radiator, and
The electric current that switching tube Q1 and inductance L1 flows through always is peak point current, and this makes the conducting of switching tube Q1
The copper loss of loss and inductance L1 is the biggest.
In sum, existing PFC rectification circuit is after adding diode, although can reduce electromagnetism
Interference, but, the PFC rectification circuit after adding diode needs to install additional scattered for newly-increased diode
Hot device, which increases volume and the cost of PFC rectification circuit, and adds the PFC after diode
The conduction loss of the switching tube in rectification circuit and the copper loss of inductance all increase.
Summary of the invention
Embodiments provide a kind of PFC commutator and uninterrupted power source, in order to solve existing PFC
Rectification circuit, when increasing diode and reducing electromagnetic interference, can increase leading of the switching tube in PFC rectification circuit
Logical loss and the copper loss of inductance, it addition, also need to install radiator additional for newly-increased diode, which increase PFC
The volume of rectification circuit and the problem of cost.
Based on the problems referred to above, a kind of PFC commutator that the embodiment of the present invention provides, including PFC rectified current
Road and at least one filter capacitor；
One end of each filter capacitor is all connected with the power frequency switch element in described PFC rectification circuit and high frequency
The junction point that switch element is connected；For a filter capacitor, the other end of this filter capacitor is connected to first
Between PFC inductance and the positive pole of DC source being described PFC rectifier power supply；
Oneth PFC inductance is a PFC inductance in described PFC rectification circuit, and the 2nd PFC inductance is
Another PFC inductance in described PFC rectification circuit.
Alternatively, for a filter capacitor, the other end of this filter capacitor is directly connected to described DC source
Positive pole.
Alternatively, a described PFC electricity is connected when the positive pole of described DC source by the first switching switch
Sense；The other end of one filter capacitor be connected to a PFC inductance with for described PFC rectifier power supply
Between the positive pole of DC source, specifically include:
The other end of this filter capacitor connects what described first switching switch was connected with a described PFC inductance
Junction point；
Wherein, described PFC commutator is cut between utility mode and battery mode by described first switching switch
Change.
The embodiment of the present invention provide another kind of PFC commutator, including PFC rectification circuit and at least one
Filter capacitor；
One end of each filter capacitor is all connected with the power frequency switch element in described PFC rectification circuit and high frequency
The junction point that switch element is connected；For a filter capacitor, the other end of this filter capacitor is connected to second
Between the negative pole of PFC inductance and described DC source；
Oneth PFC inductance is a PFC inductance in described PFC rectification circuit, and the 2nd PFC inductance is
Another PFC inductance in described PFC rectification circuit.
Alternatively, for a filter capacitor, the other end of this filter capacitor is directly connected to described DC source
Negative pole.
Alternatively, described 2nd PFC electricity is connected when the negative pole of described DC source by the second switching switch
Sense；The other end of one filter capacitor be connected to the 2nd PFC inductance with for described PFC rectifier power supply
Between the negative pole of DC source, specifically include:
The other end of this filter capacitor connects what described second switching switch was connected with described 2nd PFC inductance
Junction point；
Wherein, described PFC commutator is cut between utility mode and battery mode by described second switching switch
Change.
Alternatively, described PFC rectification circuit is Single Phase PFC Rectifier.
Alternatively, described PFC rectification circuit is heterogeneous PFC rectification circuit.
A kind of uninterrupted power source that the embodiment of the present invention provides, the PFC rectification provided including the embodiment of the present invention
Device.
The beneficial effect of the embodiment of the present invention includes:
A kind of PFC commutator of embodiment of the present invention offer and uninterrupted power source, in PFC rectification circuit
Adding at least one filter capacitor, one end of each filter capacitor is all connected with in described PFC rectification circuit
The junction point that power frequency switch element is connected with HF switch unit；The other end of this filter capacitor is connected to first
Between PFC inductance and the positive pole of DC source being described PFC rectifier power supply, or, this filter capacitor
The other end be connected between the 2nd PFC inductance and the negative pole of described DC source；Wherein, a PFC
Inductance is a PFC inductance in described PFC rectification circuit, and the 2nd PFC inductance is described PFC rectification
Another PFC inductance in circuit；So, filter capacitor flows through the PFC being connected with power frequency switching tube
All of ripple current on inductance, therefore, the positive pole of battery or negative pole are clamped at the zero line of alternating current power supply
The current potential of N, thus reduce electromagnetic interference；Owing to the low cost volume of electric capacity is little, therefore, compared to increasing
Adding diode to for reducing the PFC rectification circuit of electromagnetic interference, the volume of PFC commutator reduces；With
Time, owing to the electric current flow through on power frequency switching tube and coupled PFC inductance is DC source electric current
Meansigma methods, therefore, the conduction loss this reducing power frequency switching tube and the PFC being connected with power frequency switching tube
The copper loss of inductance.
Accompanying drawing explanation
Fig. 1 is the structural representation of PFC rectification circuit of the prior art；
The structure of PFC rectification circuit when Fig. 2 is to use diode to reduce electromagnetic interference in prior art is shown
It is intended to；
Fig. 3 is the PFC rectification circuit shown in Fig. 2 when being operated in battery mode, the device in PFC rectification circuit
The schematic diagram of the signal on part；
One of structural representation of Single-phase PFC commutator that Fig. 4 provides for the embodiment of the present invention；
The two of the structural representation of the Single-phase PFC commutator that Fig. 5 provides for the embodiment of the present invention；
The three of the structural representation of the Single-phase PFC commutator that Fig. 6 provides for the embodiment of the present invention；
Fig. 7 is the Single-phase PFC commutator shown in Fig. 4 or Fig. 5 when being operated in battery mode, PFC commutator
In device on the schematic diagram of signal；
The four of the structural representation of the Single-phase PFC commutator that Fig. 8 provides for the embodiment of the present invention；
The five of the structural representation of the Single-phase PFC commutator that Fig. 9 provides for the embodiment of the present invention；
The six of the structural representation of the Single-phase PFC commutator that Figure 10 provides for the embodiment of the present invention；
The seven of the structural representation of the Single-phase PFC commutator that Figure 11 provides for the embodiment of the present invention；
The eight of the structural representation of the Single-phase PFC commutator that Figure 12 provides for the embodiment of the present invention；
The nine of the structural representation of the Single-phase PFC commutator that Figure 13 provides for the embodiment of the present invention；
What Figure 14 provided for the embodiment of the present invention can be the knot of Single-phase PFC commutator of DC source charging
Structure schematic diagram；
The structural representation of the biphase PFC commutator that Figure 15 provides for the embodiment of the present invention；
The structural representation of the three-phase PFC commutator that Figure 16～Figure 24 provides for the embodiment of the present invention.
Detailed description of the invention
A kind of PFC commutator of embodiment of the present invention offer and uninterrupted power source, in PFC rectification circuit
Adding at least one filter capacitor, one end of each filter capacitor is all connected with in described PFC rectification circuit
The junction point that power frequency switch element is connected with HF switch unit；The other end of this filter capacitor is connected to first
Between PFC inductance and the positive pole of DC source being described PFC rectifier power supply, or, this filter capacitor
The other end be connected between the 2nd PFC inductance and the negative pole of described DC source；Compared to increasing diode
For reducing the PFC rectification circuit of electromagnetic interference, the PFC commutator that the embodiment of the present invention provides is not
But electromagnetic interference can be reduced and also reduce volume；Meanwhile, the power frequency also reduced in PFC rectification circuit is opened
The conduction loss closing pipe and the copper loss of the PFC inductance being connected with power frequency switching tube.
Below in conjunction with Figure of description, a kind of PFC commutator that the embodiment of the present invention is provided and uninterrupted electricity
The detailed description of the invention in source illustrates.
When the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is Single-phase PFC rectified current
When having a filter capacitor in road and PFC commutator, the PFC commutator that the embodiment of the present invention provides is such as
Shown in Fig. 4～Fig. 6, Fig. 8～Figure 10.
In the arbitrary figure of Fig. 4～Fig. 6, the Single-phase PFC in the PFC commutator that the embodiment of the present invention provides is whole
The structure of current circuit is: switching tube Q1 and switching tube Q2 series connection forms the first branch road, one end of inductance L1
Connecting one end of the first branch road, one end of inductance L2 connects the other end of the first branch road；Another of inductance L1
The movable contact of end connecting valve K1, a stationary contact of switch K1 is by diode D1 and diode D2
Connecting the other end of inductance L2, the anode of diode D1 is all connected with alternating current power supply with the negative electrode of diode D2
Another stationary contact of the live wire L of AC, switch K1 connects the positive pole of DC source DC, DC source
The negative pole of DC connects the other end of inductance L2；First branch road one end connects positive bus-bar electricity by diode D3
Appearance, i.e. one end of electric capacity C1, one end that diode D3 is connected with positive bus-bar electric capacity, i.e. electric capacity C1 is single
The positive bus-bar BUS+ outfan of phase PFC rectification circuit；The first branch road other end is connected by diode D4
One end of negative busbar electric capacity, i.e. electric capacity C2, the other end of the other end connection electric capacity C1 of electric capacity C2, two
The negative busbar BUS-outfan that one end is Single Phase PFC Rectifier that pole pipe D4 and electric capacity C2 is connected；Electricity
The junction point that appearance C1 is connected with electric capacity C2 is connected with the zero line N in alternating current power supply AC, electric capacity C1 and electricity
The junction point that the junction point that appearance C2 is connected is connected with switching tube Q1 and switching tube Q2 is connected.Wherein, inductance
L1 and inductance L2 is two PFC inductance in Single Phase PFC Rectifier.Switch K1 is that the first switching is opened
Close.
In the PFC commutator shown in the arbitrary figure of Fig. 4～Fig. 6, filter capacitor is electric capacity C5, electric capacity C5
The junction point that is connected with switching tube Q2 of one end connecting valve pipe Q1；In the diagram, another of electric capacity C5
End connects the movable contact (and switching the junction point that K1 is connected with inductance L) of inductance L1 and switch K1 and is connected
One end；In Figure 5, the other end of electric capacity C5 connects the positive pole of DC source DC；In figure 6,
The other end of electric capacity C5 connects the negative pole of DC source DC.
When PFC commutator shown in Fig. 4 or Fig. 5 is operated in battery mode, the movable contact of switch K1 is with straight
The stationary contact that the positive pole of stream power supply DC connects is connected, therefore, in Fig. 4 and Fig. 5, and the connection of electric capacity C5
Mode is equivalent.
When PFC commutator shown in Fig. 4 or Fig. 5 is operated under battery mode, the movable contact of switch K1 is even
Connect the stationary contact being connected in two stationary contacts of switch K1 with DC source DC positive pole, so that inductance
One end of L1 connects the positive pole of DC source DC by switch K1.
PFC commutator shown in Fig. 4 or Fig. 5 is operated under battery mode as positive bus-bar electric capacity, i.e. electric capacity
During C1 energy storage, DC source DC, inductance L1, switching tube Q1, switching tube Q2, inductance L2, two poles
Pipe D3, electric capacity C1 and electric capacity C5 constitute Boost circuit.The driving signal VGS1 of switching tube Q1, open
Close the electric current IL1 on driving signal VGS2, the inductance L1 of pipe Q2, electric current ID4 on diode D6,
And the electric current IL2 on inductance L2 is as it is shown in fig. 7, from figure 7 it can be seen that electric capacity C5 has flow through inductance
Most of ripple current on L1, even if the electric current on electric capacity C5 is also just to have when switching tube Q1 turns on
Have negative.The electric current flow through on switching tube Q2 and inductance L2 is the average of the electric current that flows through on inductance L1
The peak value of the electric current in value rather than inductance L1, this reduces the conduction loss of switching tube Q2, and subtracts
The little copper loss of inductance L2；Simultaneously as the electric current flow through on inductance L2 is direct current, switching tube Q2 leads
Logical, therefore, the current potential of the negative pole of DC source DC is clamped at the current potential of zero line N, it reduces PFC
The electromagnetic interference of commutator.Further, since the cost of electric capacity is than the low cost of diode, and the body of electric capacity
Long-pending less, therefore, the volume ratio of the rectification circuit that employing electric capacity reduces electromagnetic interference uses diode to drop
The volume of the rectification circuit of low EMI is little.
PFC commutator shown in Fig. 4 or Fig. 5 is operated under battery mode as negative busbar electric capacity, i.e. electric capacity
During C2 energy storage, DC source DC, inductance L1, switching tube Q1, switching tube Q2, inductance L2, two poles
Pipe D4, electric capacity C2 and electric capacity C5 constitute Boost circuit.Wherein, switching tube Q2 high frequency chopping, open
Closing pipe Q1 conducting, the current potential of the positive pole of DC source is clamped at the current potential of zero line N, it reduces PFC
The electromagnetic interference of commutator.
PFC commutator shown in Fig. 6 is operated under battery mode as situation during positive bus-bar capacitance energy storage and figure
PFC commutator shown in 4 or Fig. 5 is operated under battery mode as situation phase during positive bus-bar capacitance energy storage
With, do not repeat them here.
PFC commutator shown in Fig. 6 is operated under battery mode as situation during negative busbar capacitance energy storage and figure
PFC commutator shown in 4 or Fig. 5 is operated under battery mode as situation phase during negative busbar capacitance energy storage
With, do not repeat them here.
Single-phase PFC in the arbitrary figure of Fig. 8～Figure 10, in the PFC commutator that the embodiment of the present invention provides
The structure of rectification circuit is: switching tube Q1 and switching tube Q2 series connection forms the first branch road, the one of inductance L1
End connects one end of the first branch road, and one end of inductance L2 connects the other end of the first branch road；Inductance L2's is another
The movable contact of one end connecting valve K2, a stationary contact of switch K2 is by diode D2 and diode
D1 connects the other end of inductance L1, and the anode of diode D1 is all connected with exchanging with the negative electrode of diode D2
Another stationary contact of the live wire L of power supply AC, switch K2 connects the negative pole of DC source DC, direct current
The positive pole of power supply DC connects the other end of inductance L1；First branch road one end connects positive female by diode D3
One end of line capacitance C1, one end that diode D3 is connected with positive bus-bar electric capacity, i.e. electric capacity C1 is single-phase
The positive bus-bar BUS+ outfan of PFC rectification circuit；The first branch road other end connects negative by diode D4
Bus capacitor, i.e. one end of electric capacity C2, the other end of electric capacity C2 connects the other end of electric capacity C1, two poles
The negative busbar BUS-outfan that one end is Single Phase PFC Rectifier that pipe D4 and electric capacity C2 is connected；Electric capacity
The junction point that C1 is connected with electric capacity C2 is connected with the zero line N in alternating current power supply AC, electric capacity C1 and electric capacity
The junction point that the junction point that C2 is connected is connected with switching tube Q1 and switching tube Q2 is connected.Wherein, inductance L1
It is two PFC inductance in Single Phase PFC Rectifier with inductance L2.Switch K2 is the second switching switch.
In the PFC commutator shown in the arbitrary figure of Fig. 8～Figure 10, filter capacitor is electric capacity C5, electric capacity C5
The junction point that is connected with switching tube Q2 of one end connecting valve pipe Q1；In fig. 8, another of electric capacity C5
End connects the positive pole of DC source DC；In fig .9, the other end of electric capacity C5 connects inductance L2 and switch
One end that the movable contact of K2 (i.e. the junction point that inductance L2 is connected with switch K2) is connected；In Fig. 10,
The other end of electric capacity C5 connects the negative pole of DC source DC.
Shown in situation when PFC commutator shown in Fig. 8 is operated under battery mode and Fig. 4 or Fig. 5
PFC commutator be operated in battery mode at present time situation identical, do not repeat them here.
When PFC commutator shown in Fig. 9 or Figure 10 is operated in battery mode, switch K2 movable contact with
The stationary contact that the negative pole of DC source DC connects is connected, therefore, in Fig. 9 and Figure 10, and the company of electric capacity C5
The mode of connecing is equivalent.
When the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is Single-phase PFC rectified current
When having two filter capacitors in road and PFC commutator, the PFC commutator that the embodiment of the present invention provides is such as
Shown in Figure 11～Figure 13 is arbitrary.
PFC rectification circuit in PFC commutator shown in Figure 11～Figure 13 is arbitrary and the arbitrary institute of Fig. 4～Fig. 6
Show that the PFC rectification circuit in PFC commutator is identical, and, two filter capacitors in Figure 11, i.e. electricity
The connected mode holding C6 and electric capacity C7 is equivalent, and therefore, the electric capacity C5 in Fig. 4 or Fig. 5 is equivalent to
Electric capacity C6 in Figure 11 and the electric capacity after electric capacity C7 parallel connection.
Shown in situation when PFC commutator shown in Figure 11 is operated under battery mode and Fig. 4 or Fig. 5
PFC commutator be operated in battery mode at present time situation identical, do not repeat them here.
The electric capacity in the PFC commutator shown in electric capacity C7 Yu Fig. 4 in PFC commutator shown in Figure 12
The connected mode of C5 is identical, the PFC shown in electric capacity C6 Yu Fig. 6 in the PFC commutator shown in Figure 12
The connected mode of the electric capacity C5 in commutator is identical.
Shown in situation when PFC commutator shown in Figure 12 is operated under battery mode and Fig. 4 and Fig. 6
PFC commutator be operated in battery mode at present time situation identical, do not repeat them here.
The electric capacity in the PFC commutator shown in electric capacity C7 Yu Fig. 5 in PFC commutator shown in Figure 13
The connected mode of C5 is identical, the PFC shown in electric capacity C6 Yu Fig. 6 in the PFC commutator shown in Figure 13
The connected mode of the electric capacity C5 in commutator is identical.
Shown in situation when PFC commutator shown in Figure 13 is operated under battery mode and Fig. 5 and Fig. 6
PFC commutator be operated in battery mode at present time situation identical, do not repeat them here.
When PFC commutator shown in Fig. 4～Fig. 6 and Fig. 8～Figure 13 is operated in battery mode, for positive female
Line capacitance, i.e. during electric capacity C1 energy storage, HF switch unit is switching tube Q1, and power frequency switch element is switch
Pipe Q2；For negative busbar electric capacity, i.e. during electric capacity C2 energy storage, HF switch unit is switching tube Q2, work
Frequently switch element is switching tube Q1.
When the DC source in the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is permissible
PFC rectification when being charged by positive and negative bus capacitor, in the PFC commutator that the embodiment of the present invention provides
As shown in figure 14, DC source DC is required to be fully disconnected with circuit circuit, therefore, and DC source
The positive pole of DC connect a PFC inductance L1 by switch K3, the negative pole of DC source DC is by opening
Close K4 and connect the 2nd PFC inductance L2, the live wire L of alternating current power supply AC by switch K5 connection diode
The junction point that D1 is connected with diode D2, the zero line N of alternating current power supply AC connects PFC by switch K6
Neutral point N in commutator；So, disconnect at switch K3 and switch K4, switch K5 and switch K6
During Guan Bi, PFC commutator is operated in AC mode, at switch K3 and switch K4 Guan Bi, switch K5
When disconnecting with switch K6, PFC commutator is operated in battery mode.
When needs charge for DC source DC, switch K3, switch K4 all disconnect, and switch K5, open
Close K6 and switch K7 all to close, switching tube Q3 high frequency chopping；When switching tube Q3 turns on, electric current by
Positive direct-current bus BUS+ flow out, through switch K7, IGCT SCR, DC source DC, inductance L3,
With switching tube Q3, return to negative dc bus BUS-, say, that switch K7, IGCT SCR, straight
Stream power supply DC, inductance L3 and switching tube Q3 constitutes tank circuit；When switching tube Q3 turns off, electricity
Sense L3, diode D5 and electric capacity C8 constitutes continuous current circuit, continues as DC source DC charging.
One end of each filter capacitor connects PFC rectification circuit medium-high frequency switch element and power frequency switch element
The junction point being connected, i.e. M point；For a filter capacitor, the other end of this filter capacitor can connect
Any point in A point, B point, C point and D point in Figure 14 (Figure 14 only gives filter capacitor,
The other end of i.e. electric capacity C5 connects structure during C point).
In fig. 14, when the other end of electric capacity C5 connects B point, when charging for DC source DC,
Electric capacity C1, switch K7, IGCT SCR and electric capacity C5 constitute loop, and therefore, electric capacity C1 can pass through
IGCT SCR is electric capacity C5 charging, and this can produce the biggest dash current, may damage the unit in circuit
Device.When the other end of electric capacity C5 connects A point, when charging for DC source DC, electric capacity C1,
Switch K7, IGCT SCR, DC source DC and electric capacity C5 constitute loop, therefore, electric capacity C1 meeting
Being electric capacity C5 and DC source DC charging by IGCT SCR, this can produce the biggest impact electricity equally
Stream.
It is to say, when the other end of filter capacitor is just being directly connected to the DC source in PFC rectification circuit
Pole, the or during negative pole of the DC source being directly connected in PFC rectification circuit, for PFC rectification circuit
In DC source charging time, positive bus-bar electric capacity can charge for filter capacitor, and this can make produce very in circuit
Big dash current, may damage the components and parts in circuit.
And switch, when the other end of filter capacitor connects a PFC inductance and first, the junction point that switch is connected,
Or during the junction point that connection the 2nd PFC inductance and the second switching switch are connected, filling for DC source DC
During electricity, owing to the first switching switch and the second switching switch all disconnect, therefore, filter capacitor will not with for directly
The loop of stream power supply DC charging is connected, and therefore, positive bus-bar electric capacity can not charge for filter capacitor again, it is to avoid
Circuit produces the biggest dash current.
It is thus preferable to, one end of each filter capacitor in the PFC commutator that the embodiment of the present invention provides
The HF switch unit being all connected with in the PFC rectification circuit in PFC commutator is connected with power frequency switch element
Junction point；For a filter capacitor, the other end of this filter capacitor connects a PFC inductance and first
Switching switchs the junction point being connected, or the other end of this filter capacitor connects the 2nd PFC inductance and second and cuts
Change the junction point that switch is connected.
When the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is biphase PFC rectified current
Lu Shi, the PFC commutator that the embodiment of the present invention provides is as shown in figure 15.PFC rectification shown in Figure 15
PFC rectification circuit in device includes: diode D1 and diode D2 the first branch road in series, two poles
Pipe D3 and diode D4 the second branch road in series, the one end after the first branch road and the second branch circuit parallel connection with
One end of electric capacity C1 (positive bus-bar electric capacity) is connected, and junction point is positive bus-bar BUS+ outfan；First branch road
Being connected with one end of the other end after the second branch circuit parallel connection with electric capacity C2 (negative busbar electric capacity), junction point is
Negative busbar BUS-outfan；The other end of electric capacity C1 is connected with the other end of electric capacity C2, and connects biphase
Zero line N in alternating current；One end of inductance L1 connects the junction point that diode D1 is connected with diode D2,
The other end of inductance L1 is connected in positive pole and the two-phase alternating current of DC source DC respectively by switch K1
The live wire L1 of one cross streams electricity；One end of inductance L2 connects the company that diode D3 is connected with diode D4
Contact, the other end of inductance L2 connects negative pole and two cross streams of DC source DC respectively by switch K2
The live wire L2 of another cross streams electricity in electricity；One end after switching tube Q1 and switching tube Q2 series connection connects two
The junction point that pole pipe D1 is connected with diode D2, the other end after switching tube Q1 and switching tube Q2 series connection
Connect the zero line N in two-phase alternating current；One end after switching tube Q3 and switching tube Q4 series connection connects two poles
The junction point that pipe D3 is connected with diode D4, the other end after switching tube Q3 and switching tube Q4 series connection is even
Meet the zero line N in two-phase alternating current.
In fig .15, inductance L1 and inductance L2 is two PFC inductance in PFC rectification circuit, switch
K1 is the first switching switch, and switch K2 is the second switching switch, and filter capacitor is electric capacity C3.Work as Figure 15
When shown PFC commutator is operated in battery mode, for positive bus-bar electric capacity, i.e. during electric capacity C1 energy storage,
Power frequency switch element is switching tube Q3 and switching tube Q4, and HF switch unit is switching tube Q1 and switching tube
Q2, when HF switch unit turns on, can only control switching tube Q1 conducting, close at HF switch unit
Time disconnected, can only control switching tube Q1 and turn off, when power frequency switching means conductive, can only control switch
Pipe Q4 turns on, and when power frequency switch element turns off, can only control switching tube Q4 and turn off；For negative female
Line capacitance, i.e. during electric capacity C2 energy storage, HF switch unit is switching tube Q3 and switching tube Q4, and high frequency is opened
Closing unit is switching tube Q1 and switching tube Q2, when power frequency switching means conductive, can only control switching tube
Q1 turns on, and when power frequency switch element turns off, can only control switching tube Q1 and turn off, at HF switch list
During unit's conducting, can only control switching tube Q4 conducting, when HF switch unit turns off, can only control
Switching tube Q4 turns off.
Only to illustrate as a example by PFC commutator comprises a filter capacitor, i.e. electric capacity C3 in Figure 15,
Certainly, can comprise multiple filter capacitor in PFC commutator, one end of each filter capacitor is all connected with height
Frequently the junction point that switch element is connected with power frequency switch element；To any one filter capacitor, this filter capacitor
The other end can connect any point in E, F, G, the H in Figure 15 at 4.Only with filter in Figure 15
Ripple electric capacity, the i.e. other end of electric capacity C3 illustrate as a example by being connected to G point.
The connected mode of the filter capacitor in the PFC commutator shown in Figure 15 and Fig. 4～Fig. 6 and Fig. 8～figure
The connected mode of the filter capacitor in the PFC commutator shown in 13 is identical, therefore, based on identical reason,
Filter capacitor in PFC commutator shown in Figure 15 can also reduce the electromagnetic interference of PFC commutator.Separately
Outward, owing to the cost of electric capacity is than the low cost of diode, and the small volume of electric capacity, therefore, use electricity
The volume ratio holding the rectification circuit reducing electromagnetic interference uses diode to reduce the rectified current of electromagnetic interference
The volume on road is little.
It addition, during in order to avoid charging for DC source DC, produce the biggest dash current in circuit,
Based on the principle identical with the PFC commutator shown in Figure 14, the PFC commutator shown in Figure 15 include to
During a few filter capacitor, one end of each filter capacitor is all connected with HF switch unit and power frequency switch is single
The junction point that unit is connected；To any one filter capacitor, the other end of this filter capacitor can connect Figure 15
In G, H 2 in any point, say, that the other end of this filter capacitor connects a PFC
The junction point that inductance and the first switching switch are connected, or connect the 2nd PFC inductance and the second switching switch phase
Junction point even.
When the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is three-phase PFC rectified current
When having a filter capacitor in road and PFC commutator, the PFC commutator that the embodiment of the present invention provides is such as
Shown in Figure 16～Figure 21.
The structure of the PFC rectification circuit in the PFC commutator shown in Figure 16～Figure 18 is arbitrary is: switching tube
Q3 and switching tube Q4 series connection forms the second branch road, and one end of inductance L3 connects one end of the first branch road, electricity
One end of sense L4 connects the other end of the first branch road；The movable contact of the other end connecting valve K3 of inductance L3,
One stationary contact of switch K3 is by the circuit being made up of the 3rd branch road, the 4th branch road and the 5th branch circuit parallel connection
Connect the other end of inductance L4, wherein, the 3rd route diode D5A and diode D6A series connection structure
Becoming, the 4th route diode D5B and diode D6B is in series, the 5th route diode D5C
In series with diode D6C, and, anode and the diode D6A negative electrode of diode D5A are all connected with
The anode of the live wire L_A of the A phase of three-phase alternating-current supply AC, diode D5B and diode D6B negative electrode
It is all connected with the live wire L_B of the B phase of three-phase alternating-current supply AC, the anode of diode D5C and diode D6C
Negative electrode is all connected with the live wire L_C of the C phase of three-phase alternating-current supply AC；Another stationary contact of switch K3 is even
Connecing the positive pole of DC source DC, the negative pole of DC source DC connects the other end of inductance L4；Second
One end, road connects positive bus-bar electric capacity, i.e. one end of electric capacity C8, diode D7 and electric capacity by diode D7
The positive bus-bar BUS+ outfan that one end is three-phase PFC rectification circuit that C8 is connected；The second branch road other end
Connecting negative busbar electric capacity, i.e. one end of electric capacity C9 by diode D8, the other end of electric capacity C9 connects electricity
Holding the other end of C8, one end that diode D8 and electric capacity C9 is connected is the negative of three-phase PFC rectification circuit
Bus BUS-outfan；The junction point that electric capacity C8 is connected with electric capacity C9 and the zero line in alternating current power supply AC
N is connected, the company that the junction point that electric capacity C8 is connected with electric capacity C9 is connected with switching tube Q3 and switching tube Q4
Contact is connected.Wherein, inductance L3 and inductance L4 is two PFC inductance in PFC rectification circuit, opens
Closing K3 is the first switching switch.
In Figure 16 and Figure 17, one end connecting valve pipe Q3 of filter capacitor, i.e. electric capacity C12 and switch
The junction point that pipe Q4 is connected, the other end is all connected to the positive pole of DC source DC, in figure 16, electric capacity
The other end of C12 is directly connected to the positive pole of DC source DC, in fig .15, the other end of electric capacity C12
Connected the positive pole of DC source DC by switch K3, both connected modes are equivalents.
In figure 18, one end connecting valve pipe Q3 of filter capacitor, i.e. electric capacity C12 and switching tube Q4 phase
Junction point even, the other end is connected to the negative pole of DC source DC.
The structure of the PFC rectification circuit in the PFC commutator shown in Figure 19～Figure 21 is arbitrary is: switching tube
Q3 and switching tube Q4 series connection forms the second branch road, and one end of inductance L3 connects one end of the first branch road, electricity
One end of sense L4 connects the other end of the first branch road；The movable contact of the other end connecting valve K4 of inductance L4,
One stationary contact of switch K4 is by the circuit being made up of the 3rd branch road, the 4th branch road and the 5th branch circuit parallel connection
Connect the other end of inductance L3, wherein, the 3rd route diode D5A and diode D6A series connection structure
Becoming, the 4th route diode D5B and diode D6B is in series, the 5th route diode D5C
In series with diode D6C, and, anode and the diode D6A negative electrode of diode D5A are all connected with
The anode of the live wire L_A of the A phase of three-phase alternating-current supply AC, diode D5B and diode D6B negative electrode
It is all connected with the live wire L_B of the B phase of three-phase alternating-current supply AC, the anode of diode D5C and diode D6C
Negative electrode is all connected with the live wire L_C of the C phase of three-phase alternating-current supply AC；Another stationary contact of switch K4 is even
Connecing the negative pole of DC source DC, the positive pole of DC source DC connects the other end of inductance L3；Second
One end, road connects positive bus-bar electric capacity, i.e. one end of electric capacity C8, diode D7 and electric capacity by diode D7
The positive bus-bar BUS+ outfan that one end is three-phase PFC rectification circuit that C8 is connected；The second branch road other end
Connecting negative busbar electric capacity, i.e. one end of electric capacity C9 by diode D8, the other end of electric capacity C9 connects electricity
Holding the other end of C8, one end that diode D8 and electric capacity C9 is connected is the negative of three-phase PFC rectification circuit
Bus BUS-outfan；The junction point that electric capacity C8 is connected with electric capacity C9 and the zero line in alternating current power supply AC
N is connected, the company that the junction point that electric capacity C8 is connected with electric capacity C9 is connected with switching tube Q3 and switching tube Q4
Contact is connected.Wherein, inductance L3 and inductance L4 is two PFC inductance in PFC rectification circuit, opens
Closing K4 is the second switching switch.
In Figure 19, one end connecting valve pipe Q3 of filter capacitor, i.e. electric capacity C12 and switching tube Q4 phase
Junction point even, the other end connects the positive pole of DC source DC.
In Figure 20 and Figure 21, one end connecting valve pipe Q3 of filter capacitor, i.e. electric capacity C12 and switch
The junction point that pipe Q4 is connected, the other end is all connected to the negative pole of DC source DC, in figure 21, electric capacity
The other end of C12 is directly connected to the negative pole of DC source DC, in fig. 20, the other end of electric capacity C12
Connected the negative pole of DC source DC by switch K4, both connected modes are equivalents.
When the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides is three-phase PFC rectified current
When having two filter capacitors in road and PFC commutator, the PFC commutator that the embodiment of the present invention provides is such as
Shown in Figure 22～Figure 24 is arbitrary.
PFC rectification circuit in PFC commutator shown in Figure 22～Figure 24 is arbitrary is arbitrary with Figure 16～Figure 18
The shown PFC rectification circuit in PFC commutator is identical, does not repeats them here.
Two filter capacitors in PFC commutator shown in Figure 22, i.e. electric capacity C12 and the company of electric capacity C13
The mode of connecing is equivalent, therefore, and the PFC commutator shown in Figure 22 and the PFC shown in Figure 16 or Figure 17
Commutator is equivalent.
The electricity in the PFC commutator shown in electric capacity C13 Yu Figure 16 in PFC commutator shown in Figure 23
The connected mode holding C12 is identical, shown in electric capacity C12 Yu Figure 18 in the PFC commutator shown in Figure 23
PFC commutator in the connected mode of electric capacity C12 identical.
The electric capacity in the PFC commutator shown in electric capacity C7 Yu Figure 17 in PFC commutator shown in Figure 24
The connected mode of C12 is identical, shown in electric capacity C12 Yu Figure 18 in the PFC commutator shown in Figure 24
The connected mode of the electric capacity C12 in PFC commutator is identical.
When the PFC rectification circuit in two PFC commutators one is Single Phase PFC Rectifier, another
During for three-phase PFC rectification circuit, if the connected mode phase of the filter capacitor in the two PFC commutator
With, then, when the two PFC commutator is all operated under battery mode, the two PFC commutator
Working condition identical, say, that the PFC commutator shown in Figure 16～Figure 24 can based on Fig. 4～
The same principle of PFC commutator shown in Fig. 6 and Fig. 8～Figure 13 reduces electromagnetic interference, and reduces PFC
The volume of commutator, reduces the cost of PFC commutator.
When PFC commutator shown in Figure 16～Figure 24 is operated in battery mode, for positive bus-bar electric capacity, i.e.
During electric capacity C8 energy storage, HF switch unit is switching tube Q3, and power frequency switch element is switching tube Q4；?
For negative busbar electric capacity, i.e. during electric capacity C9 energy storage, HF switch unit is switching tube Q4, power frequency switch element
For switching tube Q3.
Equally, based on the principle as the PFC commutator shown in Fig. 4～Fig. 6 and Fig. 8～Figure 13, for
Avoid rush of current when charging into DC source DC, in the PFC commutator shown in Figure 16～Figure 24
The power frequency switch element that is all connected with in PFC rectification circuit of one end of filter capacitor and HF switch unit phase
Junction point even；For a filter capacitor, the other end of this filter capacitor connects a PFC inductance and the
The junction point that one switching switch is connected, or the connection that connection the 2nd PFC inductance and the second switching switch are connected
Point.
Certainly, the PFC rectification circuit in the PFC commutator that the embodiment of the present invention provides can also is that other
Heterogeneous PFC rectification circuit, the embodiment of the present invention provide PFC commutator in filter capacitor can have
N number of, one end of each filter capacitor connects the power frequency switch element in PFC rectification circuit and HF switch list
The junction point that unit is connected, wherein, the other end of M filter capacitor in N number of filter capacitor connects PFC
Any between positive pole and a PFC inductance of DC source DC when commutator is operated under battery mode
Point；The other end of N-M filter capacitor connects DC source when PFC commutator is operated under battery mode
Arbitrfary point between negative pole and the 2nd PFC inductance of DC.Wherein, M is more than or equal to zero, less than or equal to N.
It is preferred that rush of current during in order to avoid charging for DC source, the PFC that the embodiment of the present invention provides
Power frequency switch element that one end of each filter capacitor in commutator is all connected with in PFC rectification circuit and height
Frequently the junction point that switch element is connected, the other end connection the of M filter capacitor in N number of filter capacitor
The junction point that one PFC inductance and the first switching switch are connected, the other end connection the of N-M filter capacitor
The junction point that two PFC inductance and the second switching switch are connected.
A kind of uninterrupted power source that the embodiment of the present invention provides, the PFC rectification provided including the embodiment of the present invention
Device.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the mould in accompanying drawing
Block or flow process are not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in the device in embodiment can describe according to embodiment
Carry out being distributed in the device of embodiment, it is also possible to carry out respective change and be disposed other than one of the present embodiment
Or in multiple device.The module of above-described embodiment can merge into a module, it is also possible to is further split into
Multiple submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a PFC PFC commutator, it is characterised in that include PFC rectification circuit and extremely
A few filter capacitor；
One end of each filter capacitor is all connected with the power frequency switch element in described PFC rectification circuit and high frequency
The junction point that switch element is connected；For a filter capacitor, the other end of this filter capacitor is connected to first
Between PFC inductance and the positive pole of DC source being described PFC rectifier power supply；
Oneth PFC inductance is a PFC inductance in described PFC rectification circuit, and the 2nd PFC inductance is
Another PFC inductance in described PFC rectification circuit.
2. PFC commutator as claimed in claim 1, it is characterised in that another of a filter capacitor
End is connected between a PFC inductance and the positive pole for the DC source of described PFC rectifier power supply, tool
Body includes:
The other end of this filter capacitor is directly connected to the positive pole of described DC source.
3. PFC commutator as claimed in claim 1, it is characterised in that the positive pole of described DC source
A described PFC inductance is connected by the first switching switch；The other end of one filter capacitor is connected to first
Between PFC inductance and the positive pole of DC source being described PFC rectifier power supply, specifically include:
The other end of this filter capacitor connects what described first switching switch was connected with a described PFC inductance
Junction point；
Wherein, described PFC commutator is cut between utility mode and battery mode by described first switching switch
Change.
4. PFC commutator as claimed in claim 1, it is characterised in that described PFC rectification circuit is
Single Phase PFC Rectifier or heterogeneous PFC rectification circuit.
5. a PFC PFC commutator, it is characterised in that include PFC rectification circuit and extremely
A few filter capacitor；
One end of each filter capacitor is all connected with the power frequency switch element in described PFC rectification circuit and high frequency
The junction point that switch element is connected；For a filter capacitor, the other end of this filter capacitor is connected to second
Between the negative pole of PFC inductance and described DC source；
Oneth PFC inductance is a PFC inductance in described PFC rectification circuit, and the 2nd PFC inductance is
Another PFC inductance in described PFC rectification circuit.
6. PFC commutator as claimed in claim 5, it is characterised in that another of a filter capacitor
End is connected between the 2nd PFC inductance and the negative pole for the DC source of described PFC rectifier power supply, tool
Body includes:
The other end of this filter capacitor is directly connected to the negative pole of described DC source.
7. PFC commutator as claimed in claim 5, it is characterised in that the negative pole of described DC source
Described 2nd PFC inductance is connected by the second switching switch；The other end of one filter capacitor is connected to second
Between PFC inductance and the negative pole of DC source being described PFC rectifier power supply, specifically include:
The other end of this filter capacitor connects what described second switching switch was connected with described 2nd PFC inductance
Junction point；
Wherein, described PFC commutator is cut between utility mode and battery mode by described second switching switch
Change.
8. PFC commutator as claimed in claim 5, it is characterised in that described PFC rectification circuit is
Single Phase PFC Rectifier or heterogeneous PFC rectification circuit.
9. a uninterrupted power source, it is characterised in that include that the arbitrary described PFC of claim 1～8 is whole
Stream device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510051349.2A CN105991020A (en) | 2015-01-30 | 2015-01-30 | Power factor correction rectifier and uninterrupted power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510051349.2A CN105991020A (en) | 2015-01-30 | 2015-01-30 | Power factor correction rectifier and uninterrupted power supply |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707128A (en) * | 2017-10-19 | 2018-02-16 | 珠海格力电器股份有限公司 | Variable frequency drive, system and dc-link capacitance charging method |
| TWI697181B (en) * | 2018-10-22 | 2020-06-21 | 亞源科技股份有限公司 | Dc-to-dc converter with a power factor correction function |
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| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| US20080061628A1 (en) * | 2006-09-08 | 2008-03-13 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
| CN103875171A (en) * | 2011-08-29 | 2014-06-18 | 施耐德电气It公司 | Twin boost converter with integrated charger for ups |
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|---|---|---|---|---|
| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| US20080061628A1 (en) * | 2006-09-08 | 2008-03-13 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
| CN103875171A (en) * | 2011-08-29 | 2014-06-18 | 施耐德电气It公司 | Twin boost converter with integrated charger for ups |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107707128A (en) * | 2017-10-19 | 2018-02-16 | 珠海格力电器股份有限公司 | Variable frequency drive, system and dc-link capacitance charging method |
| TWI697181B (en) * | 2018-10-22 | 2020-06-21 | 亞源科技股份有限公司 | Dc-to-dc converter with a power factor correction function |
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