CN106208670A - A kind of Bridgeless power factor correction soft switch circuit and control method thereof - Google Patents
A kind of Bridgeless power factor correction soft switch circuit and control method thereof Download PDFInfo
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- CN106208670A CN106208670A CN201610847432.5A CN201610847432A CN106208670A CN 106208670 A CN106208670 A CN 106208670A CN 201610847432 A CN201610847432 A CN 201610847432A CN 106208670 A CN106208670 A CN 106208670A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of Bridgeless power factor correction soft switch circuit, including power supply unit, power part and control portion, described power supply unit is connected with described power part thinks that described power part provides electric energy, described power part includes one or more interleaved power factor correcting circuit, wherein every road interleaved power factor correcting circuit includes an inductance, pair of switches element, first electric capacity in parallel with each switch element and at least one the second electric capacity, one end of inductance is connected with power supply unit, the other end of described inductance is connected to the two ends of each second electric capacity by pair of switches element.The electric current of the upper leg switching elements of control portion sampling, when detecting that the electric current flowing through upper leg switching elements is negative current when reaching threshold value, leg switching elements in shutoff；On turning off after leg switching elements, the electric current of each switch element of sampling, when the electric current flowing through upper leg switching elements or lower leg switching elements reaches zero or during close to zero, the lower leg switching elements of Guan Bi.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to Bridgeless power factor correction (Power Factor
Correction, PFC) soft switch circuit and control method thereof.
Background technology
The traditional bridge PFC circuits that has of non-bridge PFC circuits replacement at present is widely used.The most simply introduce existing
The operation principle of non-bridge PFC circuits.It is illustrated in figure 1 the structural representation of the staggered pfc circuit of existing two-way.Two-way interlocks
Pfc circuit, 2 brachium pontis interlock 180 ° and work, optional MOSFET or IGBT of switch element.With reference to Fig. 2, the brachium pontis connected with L1
As a example by, when switch element Q2 closes, current loop flows through L1, Q2, and now inductance L1 carries out energy storage, flows through the electric current of inductance L1
Linear rise.Within the turn-off time of switch element Q2, switch element Q1 turns on, and current loop is through L1, Q1, electric capacity C, two poles
Pipe D1, now inductance L1 releases energy, and the electric current flowing through inductance L1 can linear decline.Until electric current drops to negative current, now
Turn off switch element Q1.Then need to open switch element Q2.Open now switch element Q2 and typically have two kinds of methods:
Method one: the method for fixing Dead Time.Calculate the resonance time of interelectrode capacity and inductance L1, by fixing input
Voltage, output voltage, inductance initial current value arranges Dead Time and opens Q2.As it is shown on figure 3, the t1 moment turns off Q1, fixing
Time interval after, open Q2 in the t2 moment.But the method has certain deficiency, due to discreteness and the temperature of device, pole
Between the impact such as voltage, the electric capacity at switch element two ends is difficult to accurately estimate, causes its harmonic period with inductance to apply in reality
In be difficult to accurately calculate.If harmonic period is long or too short, when Q2 closes, its both end voltage is the highest, causes relatively
Big loss, loses the superiority of this topology.Secondly, Q2 both end voltage reaches time and the input voltage of the minimum of resonance
Having relation with busbar voltage and inductance reverse current, input voltage is low, and busbar voltage is high, and inductance reverse current is little all can be caused
The time that Q2 both end voltage reaches resonance minimum point is elongated, if working condition changes, during Q2 Guan Bi, its both end voltage also has
May be the highest, cause bigger loss.
Method two: the method for brachium pontis mid-point voltage detection.Detection brachium pontis mid-point voltage, when voltage is less than threshold voltage,
Open switch element Q2.As shown in Figure 4, t1 moment switch element Q1 turns off, and switch element both end voltage constantly declines, t2
When (t2 ') moment reaches set threshold voltage U1, open switch element Q2.This kind of method also has certain defect, because
The minimum of Q2 both end voltage resonance and input voltage and busbar voltage and inductance reverse current have relation, and input voltage is high,
Busbar voltage is low, and the little minimum point that all can cause Q2 both end voltage resonance of inductance reverse current raises.So in order at work model
Enclosing the interior optimization realizing loss, threshold voltage can not arrange the lowest.As shown in Figure 4, according to setting threshold value electricity under dotted line case
Pressure U1, can realize Guan Bi Q2 during minimum voltage under this voltage conditions.But under other voltage conditions, the threshold set before this
The minimum voltage at two ends when threshold voltage U1 is not capacitor resonance, as shown by the solid line in the drawings, when voltage drops to threshold voltage U1
Time just opened Q2, but now electric capacity both end voltage is not preferably minimized value, now opens the switching loss that Q2 causes bigger.Thus
It can be seen that the method does not the most make switching loss minimize, under partial picture, still there is bigger switch
Loss.
Summary of the invention
For above-mentioned technical problem, the present invention proposes a kind of Bridgeless power factor correction soft switch circuit and controlling party thereof
Method, in non-bridge PFC circuits, closes switch element, it is achieved switch element is at zero electricity when the electric current flowing through switch element is zero
Pressure or open-minded during minimum voltage, maximizes and reduces switching loss.
A kind of Bridgeless power factor correction soft switch circuit of the present invention, it comprises power supply unit, power part and control portion.Its
Middle power supply unit links together with power part, and power supply unit provides electric energy for power part.Power part comprises a road or multichannel is interlocked
Pfc circuit, containing an inductance in the circuit of each of which road, pair of switches element, the first electricity that switch element two ends are in parallel
Hold and at least one second electric capacity.One end of inductance is connected with power supply unit, and the other end connects pair of switches element, in power part
One end of another termination capacitor of upper leg switching elements, in power part, the other end of lower leg switching elements is connected to electric capacity
The other end.Control portion includes current sample element and electric current comparison controller, and current sample element is sampled in described power part
The electric current of upper leg switching elements；When detecting that the electric current flowing through upper leg switching elements is negative current when reaching threshold value, institute
State electric current comparison controller and turn off described upper leg switching elements；On turning off after leg switching elements, current sample element is adopted
The electric current of each switch element in power part described in sample, when flowing through upper leg switching elements or the electric current of lower leg switching elements
Reach zero or during close to zero, the lower leg switching elements of electric current comparison controller Guan Bi.
The control method of a kind of Bridgeless power factor correction soft switch circuit of the present invention, soft switch circuit comprises power supply
Portion, power part and control portion, wherein power supply unit links together with power part, and power supply unit provides electric energy for power part.Power part
Comprise the pfc circuit that a road or multichannel are staggered, containing an inductance in the circuit of each of which road, pair of switches element, switch
First electric capacity of element two ends parallel connection and at least one the second electric capacity.One end of inductance is connected with power supply unit, and the other end connects
Pair of switches element, one end of another termination capacitor of upper leg switching elements in power part, in power part, lower brachium pontis switch is first
The other end of part is connected to the other end of electric capacity.Described control method includes: sampling flows through the described upper bridge in described power part
The electric current of arm switch element, when detecting that described electric current drops to negative current and reaches threshold value, control portion turns off upper brachium pontis and opens
Close element；On turning off after leg switching elements, sampling flows through the electric current of each described switch element in power part, works as detection
Reach to described electric current or during close to zero, open lower leg switching elements.
The present invention uses the method for current detecting to control the open-minded of switch element, it is possible to realizes the soft of switch element and opens
Close, even and if minimum voltage is more than zero during the capacitor resonance of switch element two ends, there is voltage in its two ends, also can guarantee that minimum
Open switch element during voltage, maximize and reduce switching loss.
Accompanying drawing explanation
Fig. 1 is the structure chart of the pfc circuit that existing two-way interlocks.
Fig. 2 is current waveform and the driving voltage waveform of Q1, Q2 of inductance L1 in the pfc circuit that existing two-way is staggered
Figure.
When Fig. 3 is the interelectrode capacity resonance using fixing Dead Time method in the pfc circuit that existing two-way is staggered its
The oscillogram of both end voltage.
When Fig. 4 is the interelectrode capacity resonance of existing two-way staggered pfc circuit bridge arm mid-point voltage detection method its
The oscillogram of both end voltage.
Fig. 5 is the structure chart of the two-way interleaving PFC circuit according to the embodiment of the present invention.
Fig. 6 is to turn off according to Q1 in the pfc circuit of the embodiment of the present invention, current direction figure when Q2 opens.
Fig. 7 is to turn off according to Q2 in the pfc circuit of the embodiment of the present invention, current direction figure when Q1 does not opens.
Fig. 8 is to turn off according to Q2 in the pfc circuit of the embodiment of the present invention, equivalent circuit diagram when Q1 does not opens and electric capacity
The voltage oscillogram of C1, C2.
Fig. 9 is open-minded according to Q1 in the pfc circuit of the embodiment of the present invention, forward current flow graph when Q2 turns off.
Figure 10 is open-minded according to Q1 in the pfc circuit of the embodiment of the present invention, negative current flow graph when Q2 turns off.
Figure 11 is to turn off according to Q1 in the pfc circuit of the embodiment of the present invention, current direction figure when Q2 does not opens.
Figure 12 is the voltage and current waveform according to the electric capacity C2 resonance for the moment of situation in the pfc circuit of the embodiment of the present invention.
Figure 13 is according to the voltage and current waveform of electric capacity C2 resonance during situation two in the pfc circuit of the embodiment of the present invention.
Figure 14 be the pfc circuit breaker in middle element Q1 according to the embodiment of the present invention and the drive waveforms of switch element Q2 and
The current waveform of inductance L1.
Figure 15 is the structure chart of the pfc circuit that the N road according to the embodiment of the present invention interlocks.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completely
Description, it is clear that described example is a part of embodiment of the present invention rather than all examples.
As it is shown in figure 5, the soft switch circuit of the present invention comprises power supply unit, power part and control portion.Wherein power supply unit and merit
Commanding troops to link together, power supply unit provides electric energy for power part.
In power part, including the pfc circuit that one or more is staggered.As a example by a road interleaving PFC circuit, such as Fig. 5, its
Comprise an inductance L1, pair of switches element (upper leg switching elements Q1, lower leg switching elements Q2), and at least one electricity
Hold C.First end of inductance L1 is connected with power pack, and second end of L1 is connected to one end of electric capacity C by switch element Q1；L1
The second end be connected to the other end of electric capacity C again by switch element Q2.Simultaneous Switching element Q1, the parallel connection one also respectively of Q2 two ends
Individual electric capacity, this electric capacity can merge with the output capacitance of switch element and regard C1 as, C2.Switch element (Q1, Q2) is that insulated-gate type is double
Bipolar transistor IGBT or metal oxide semiconductor field-effect official MOSFET.
In power supply unit, power supply (alternating current power supply) one end is connected respectively to electric capacity C two ends, the other end by pair of diodes
It is connected to inductance L1.When the pfc circuit that a road is staggered has multiple electric capacity C, these electric capacity C can be with parallel processing.
In control portion, including current sample element and electric current comparison controller.Current sample in current sample element
Part and switch element (Q1, Q2) series connection with sample each switch element electric current, the sampled output signal of current sample element
It is connected with the input of described electric current comparison controller.Current sample element includes resistance or Current Transmit or Hall unit
Part.
Electric current comparison controller is by DSP (digital signal processor), MCU (microprocessor), CPLD (complex programmable logic
Device), one or more compositions in FPGA (programmable logic array).The outfan of electric current comparison controller is connected to each
The grid of switch element (Q1, Q2), arranges the threshold value of sample rate current to controller, and controller is according to electric current in current sample information
Direction and size control switch element.I.e. when sample rate current reaches threshold value, controller will turn off or open switch element.
The method using current detecting controls the open-minded of switch element, it is possible to realize the Sofe Switch of switch element, even and if switching
During the capacitor resonance of element two ends, minimum voltage is more than zero, and its two ends exist voltage, also can guarantee that and open switch when minimum voltage
Element, maximizes and reduces switching loss.With in the pfc circuit of Fig. 5, with alternating current positive half period, the brachium pontis that inductance L1 connects is
Example, illustrates the control method of the pfc circuit of the embodiment of the present invention, wherein electric capacity C1, C2 be switch element output capacitance with also
The equivalent capacity of connection electric capacity.
As shown in Figure 6, in the ON time of switch element Q2, current loop is through inductance L1, switch element Q2, now
Inductance L1 energy storage, flows through the electric current linear rise of inductance L1.
As it is shown in fig. 7, when switch element Q2 turns off, when switch element Q1 not yet opens, inductance L1 still has electric current, electric current
L1, electric capacity C2, diode VD2, now electric capacity C2 charging are passed through in loop, and the voltage Uc2 at electric capacity C2 two ends rises；Electric current stream simultaneously
Discharging through electric capacity C1, electric capacity C1, Uc1 declines.Until electric capacity C1, C2 discharge and recharge is complete, i.e. Uc1=0, Uc2=Uc, diode D1
Conducting, now opens switch element Q1, it is achieved the no-voltage of switch element is open-minded, this stage equivalent circuit diagram and C1, the electricity of C2
Corrugating is as shown in Figure 8.
When switch element Q1 turn on after, current loop through inductance L1, switch element Q1, electric capacity C and diode VD2,
As shown in Figure 9.Now switch element Q1 can be constantly in ON time, thus the electric current of inductance L1 can linear decline.Open
Close element Q1 can go straight down to have negative current on negative current, i.e. L1, now circuit such as Figure 10.
When control portion detects that upper leg switching elements electric current drops to negative current and reaches threshold value, controller closes and disconnects
Close element Q1.Now switch element Q1 turns off, and switch element Q2 does not turns on, and inductance L1 still has electric current, electric current flow through electric capacity C1,
C2, electric capacity C1 charge, and Uc1 rises；Electric capacity C2 discharges, and Uc2 declines, and now in circuit, current direction is as shown in figure 11.Switch unit
The open method using current detecting, i.e. detection of part Q2 flow through the electric current of switch element Q2 (or Q1), when it drops to zero,
Guan Bi switch element Q2.2 kinds of situation figure explanations according to capacitor resonance:
Situation 1: during electric capacity C2 resonance, two ends minimum voltage can arrive no-voltage, the resonant voltage waveforms of C2 as shown in figure 12,
The t1 moment turns off both end voltage after switch element Q1, electric capacity C2 discharge and can reduce to zero, Uc1=Uc, Uc2=0, now switch element
The body diode conducting of Q2, switch element Q2 both end voltage is zero, and the electric current flowing through switch element Q1 is reduced to zero, when control portion
Go-on-go measures and flows through the electric current of switch element Q1 or Q2 and be reduced to when zero open switch element Q2, it is achieved the no-voltage of switch element
Open-minded.
Situation 2: during electric capacity C2 resonance, two ends minimum voltage can not be down to zero.When input voltage raises, and BUS voltage reduces,
Inductance reverse current is less than normal, can cause the situation that capacitor resonance minimum voltage raises.When minimum voltage is more than zero, this situation
Electric capacity C2 resonant voltage waveforms figure as shown in figure 13, the t1 moment turns off switch element Q1, and hereafter voltage reduces, electric current also by
Gradually declining, the electric current flowing through switch element Q2 in t2 (t2 ', the t2 ") moment is down to zero, and switch element Q2 both end voltage is down to minimum
Voltage Umin (Umin ', 0), now Guan Bi switch element Q2, makes switching loss be minimized.It can also be seen that no matter from figure
In what situations, when electric current is down to zero, switch element both end voltage is always minimum, and the method can ensure that Guan Bi switch is first
During part, its both end voltage is minimum, can at utmost reduce switching loss.
Two kinds of situations of summary, it can be seen that in this inventive embodiments, by current detecting, when flowing through switch element
Close switch element when electric current is zero, use the method can realize no-voltage and open or open in the case of minimum voltage switch unit
Part, reaches minimizing of switching loss.
In Figure 14, give the current waveform of inductance L1, the driving voltage waveform of switch element Q1 and switch element Q2.From
It can be seen that switch element Q2 is during turning in Figure 14, the electric current of inductance L1 rises.After Guan Bi switch element Q1, inductance L1
Electric current linear decline.During until controller detects that flowing through switch element Q1 drops to negative current and reach threshold value, controller
Turning off switch element Q1, through inductance L1 and electric capacity C1, the resonance of C2, when the electric current of switch element Q1 or Q2 reduces to zero or connect
Switch element Q2 is closed when nearly zero.Here, the electric current of switch element Q1 or Q2 drops to approximately zero, specifically could be arranged to be less than
The half of negative current threshold value.I.e. when the electric current of switch element Q1 or Q2 reduces to the half less than negative current threshold value, Guan Bi switch
Element Q2, can minimize the effect opening switch element near voltage equally.
Figure 15 is the pfc circuit with N road interleaving PFC circuit according to the embodiment of the present invention, and its operation principle is with above-mentioned
The operation principle of the pfc circuit of only 2 road interleaving PFC circuit is identical.
The above-mentioned description to embodiment includes some exploration parts, and this part is to obtain on the basis of great many of experiments
The conclusion arrived, it is therefore an objective to be understood that for ease of those skilled in the art and use invention.Skilled
Personnel obviously can easily these examples be made various amendment, and it is real that General Principle described herein is applied to other
Execute in example without through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art are according to this
The announcement of invention, the improvement made without departing from scope and amendment all should be within protection scope of the present invention.
Claims (9)
1. a Bridgeless power factor correction soft switch circuit, it is characterised in that include power supply unit, power part and control portion,
Described power supply unit is connected with described power part thinks that described power part provides electric energy, and described power part includes one or more
Interleaved power factor correcting circuit,
Wherein every road interleaved power factor correcting circuit includes an inductance, pair of switches element and each described first switch
First electric capacity of element in parallel and at least one second electric capacity, the pair of switch element includes leg switching elements and Xia Qiao
Arm switch element,
One end of described inductance is connected with described power supply unit, and the other end of described inductance is connected to by the pair of switch element
The two ends of each described second electric capacity, are series relationship between the pair of switch element, and are parallel with body diode respectively, institute
The drain electrode of the source electrode and lower leg switching elements of stating leg switching elements is connected, the drain electrode of described lower leg switching elements and institute
State at least one second electric capacity and described power supply unit to connect, the source electrode of described upper leg switching elements with described at least one second
Electric capacity and described power supply unit connect,
Described control portion includes current sample element and electric current comparison controller, and current sample element is sampled in described power part
The electric current of upper leg switching elements, when detecting that the electric current flowing through upper leg switching elements is negative current when reaching threshold value, institute
State electric current comparison controller and turn off described upper leg switching elements,
Turning off on described after leg switching elements, each described switch element in the current sample element described power part of sampling
Electric current, when the electric current flowing through described upper leg switching elements or lower leg switching elements reaches zero or during close to zero, described electricity
Stream comparison controller closes described lower leg switching elements.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described at least one
Two electric capacity include multiple shunt capacitance.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described current sample unit
Current sample part in part and described switch elements in series are with the electric current of described switch element of sampling, described current sample element
Sampled output signal be connected with the input of described electric current comparison controller, the outfan of described electric current comparison controller is with every
The grid of individual switch element connects.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described current sample unit
Part includes resistance or Current Transmit or Hall element.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described current ratio is relatively controlled
Device processed is by DSP, one or more compositions in MCU, CPLD, FPGA.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described power supply unit includes
Alternating current power supply and two diodes, one end of described alternating current power supply is connected with described second electric capacity by each described diode,
The other end of described alternating current power supply and described inductance connection.
Bridgeless power factor correction soft switch circuit the most according to claim 1, it is characterised in that described switch element is
Insulating gate type bipolar transistor IGBT or metal oxide semiconductor field-effect official MOSFET.
8. the control method of a Bridgeless power factor correction soft switch circuit, it is characterised in that described circuit include power supply unit,
Power part and control portion, described power supply unit is connected with described power part thinks that described power part provides electric energy, described power part bag
Include one or more interleaved power factor correcting circuit, wherein every road interleaved power factor correcting circuit include an inductance, one
First electric capacity in parallel with each described switch element to switch element and at least one second electric capacity, the pair of switch unit
Part includes leg switching elements and lower leg switching elements, and the other end of described inductance is connected by the pair of switch element
To the two ends of each described second electric capacity, it is series relationship between the pair of switch element, and is parallel with body diode respectively,
The source electrode of described upper leg switching elements is connected with the drain electrode of lower leg switching elements, the drain electrode of described lower leg switching elements with
At least one second electric capacity described and described power supply unit connect, the source electrode of described upper leg switching elements with described at least one the
Two electric capacity and described power supply unit connect, and described control method includes:
The sampling of described control portion flows through the electric current of the described upper leg switching elements in described power part,
When detecting that described electric current drops to negative current and reaches threshold value, control portion turns off described upper leg switching elements；
Turning off on described after leg switching elements, the sampling of described control portion flows through each described switch unit in described power part
The electric current of part, when detecting that described electric current reaches or during close to zero, opens described lower leg switching elements.
Method the most according to claim 8, detects close to zero, described electric current refers to that described electric current is less than described negative current
The half of threshold value.
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| CN106771807A (en) * | 2016-12-19 | 2017-05-31 | 杭州先途电子有限公司 | The detection method of heater switch fault |
| CN109217652A (en) * | 2018-10-29 | 2019-01-15 | 深圳市高斯宝电气技术有限公司 | A kind of control method of Bridgeless power factor circuit correcting circuit |
| CN109713676A (en) * | 2019-01-23 | 2019-05-03 | 深圳市高斯宝电气技术有限公司 | A kind of control method of crisscross parallel Bridgeless power factor circuit correcting circuit |
| CN111969873A (en) * | 2020-08-18 | 2020-11-20 | 常州索维尔电子科技有限公司 | Control method of voltage source type off-grid inverter |
| WO2021135343A1 (en) * | 2019-12-31 | 2021-07-08 | 华为技术有限公司 | Current detecting device and power factor correction device |
| CN113960359A (en) * | 2021-12-22 | 2022-01-21 | 江苏由甲申田新能源科技有限公司 | Current sampling circuit, method, system, device and storage medium |
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