CN106487207A - A kind of control method of power conversion circuit and device - Google Patents
A kind of control method of power conversion circuit and device Download PDFInfo
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- CN106487207A CN106487207A CN201510549080.0A CN201510549080A CN106487207A CN 106487207 A CN106487207 A CN 106487207A CN 201510549080 A CN201510549080 A CN 201510549080A CN 106487207 A CN106487207 A CN 106487207A
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- power conversion
- conversion circuit
- brachium pontis
- duration
- input inductance
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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
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Abstract
The invention discloses a kind of control method of power conversion circuit and device, the no-voltage being capable of high frequency bridge arm switch pipe is open-minded, reduces circuit loss, improves circuit efficiency.This control method includes：Input inductance for each in power conversion circuit, detect the electric current of this input inductance；When the current zero-crossing point of this input inductance is detected, control the first duration in the conduction state of the main switch on the high frequency brachium pontis of this input inductance connection, and control the continued flow switch pipe on the high frequency brachium pontis of this input inductance connection to be off state；After controlling this main switch the first duration in the conduction state, control this main switch to be off state, and control this continued flow switch pipe the second duration in the conduction state.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, to a kind of control method of power conversion circuit and
Device.
Background technology
Power conversion circuit include PFC (Power Factor Correction, PFC) circuit,
UPS (Uninterrupted Power Supply, uninterrupted power source) circuit etc., taking pfc circuit as a example,
Structure to power conversion circuit and existing control method are briefly described.
In prior art, efficient pfc circuit mainly includes single channel totem pole pfc circuit and Fig. 2 shown in Fig. 1
Shown staggered totem pole pfc circuit.In single channel totem pole pfc circuit shown in Fig. 1, switching tube Qsr1
Constitute a power frequency brachium pontis with Qsr2, this power frequency brachium pontis can also be made up of two diodes, switching tube Q1
Constitute a high frequency brachium pontis with Q2, the midpoint of this high frequency brachium pontis by an input inductance L1 with exchange defeated
Enter source to be connected；In staggered totem pole pfc circuit shown in Fig. 2, switching tube Qsr1 and Qsr2 constitutes one
Power frequency brachium pontis, this power frequency brachium pontis can also be made up of two diodes, and it is individual high that switching tube Q1～Q2n constitutes n
Frequency brachium pontis, the midpoint of this n high frequency brachium pontis is respectively by one of n input inductance L1～Ln input electricity
Sense is connected with input AC source.
A kind of two kinds of more conventional control methods of pfc circuit are CRM (Critical Conduction
Mode, critical conduction mode) control.However, CRM controls the AC-input voltage wink in pfc circuit
Duration is capable of switching tube on high frequency brachium pontis no-voltage when being less than the half of bus capacitor Cpfc voltage is opened
Logical, but height can not be realized when instantaneous AC input voltage is more than the half of bus capacitor Cpfc voltage
On frequency brachium pontis, the no-voltage of switching tube is open-minded, causes circuit loss larger.
Content of the invention
The embodiment of the present invention provides a kind of control method of power conversion circuit and device, in order to solve existing skill
Switching tube on high frequency brachium pontis present in art cannot realize the problem that no-voltage is opened.
Embodiments provide a kind of control method of power conversion circuit, including：
Input inductance for each in power conversion circuit, detect the electric current of this input inductance；
When the current zero-crossing point of this input inductance is detected, control on the high frequency brachium pontis of this input inductance connection
Main switch the first duration in the conduction state, and control continuous on the high frequency brachium pontis of this input inductance connection
Stream switching tube is off state；
After controlling this main switch the first duration in the conduction state, this main switch is controlled to be off shape
State, and control this continued flow switch pipe the second duration in the conduction state.
The embodiment of the present invention additionally provides a kind of control device of power conversion circuit, including：
Detector unit, for inputting inductance for each in power conversion circuit, detects this input inductance
Electric current；
Control unit, for when the current zero-crossing point of this input inductance is detected, controlling this input inductance even
The first duration in the conduction state of the main switch on high frequency brachium pontis connecing, and control this input inductance connection
Continued flow switch pipe on high frequency brachium pontis is off state；Controlling this main switch in the conduction state first
After duration, control this main switch to be off state, and control this continued flow switch pipe in the conduction state
Two durations.
Beneficial effects of the present invention include：
In scheme provided in an embodiment of the present invention, the electric current of detection input inductance, input inductance when detecting
During current zero-crossing point, control the main switch on the high frequency brachium pontis of this input inductance connection in the conduction state
One duration, and control the continued flow switch pipe on the high frequency brachium pontis of this input inductance connection to be off state；?
After controlling this main switch the first duration in the conduction state, this main switch is controlled to be off state, and
Control this continued flow switch pipe the second duration in the conduction state.By controlling the conducting duration of continued flow switch pipe,
Can allow to input inductive current reversely it is possible to control the size of the turn-off reversal electric current of continued flow switch pipe,
Ensure have enough electric currents to extract and to discharge the electric charge of the parasitic junction capacitance of main switch and continued flow switch pipe,
Thus the no-voltage realizing switching tube is open-minded.
Brief description
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for description, with this
Bright embodiment is used for explaining the present invention together, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of single channel totem pole pfc circuit；
Fig. 2 is the schematic diagram of staggered totem pole pfc circuit；
Fig. 3 is the schematic diagram of the control method of power conversion circuit provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of the control device of power conversion circuit provided in an embodiment of the present invention.
Specific embodiment
In order to provide the implementation that power conversion circuit medium-high frequency brachium pontis switch tube zero voltage is opened, the present invention
Embodiment provides a kind of control method of power conversion circuit and device, in conjunction with Figure of description to the present invention
Preferred embodiment illustrate it will be appreciated that preferred embodiment described herein is merely to illustrate reconciliation
Release the present invention, be not intended to limit the present invention.And the embodiment in the case of not conflicting, in the application
And the feature in embodiment can be mutually combined.
Embodiments provide a kind of control method of power conversion circuit, as shown in figure 3, can wrap
Include following steps：
Step 301, each being directed in power conversion circuit input inductance, detect the electric current of this input inductance；
Step 302, when the current zero-crossing point of this input inductance is detected, control this input inductance connection
Main switch on high frequency brachium pontis the first duration in the conduction state, and control the high frequency of this input inductance connection
Continued flow switch pipe on brachium pontis is off state；Controlling this main switch the first duration in the conduction state
Afterwards, control this main switch to be off state, and control this continued flow switch pipe in the conduction state second when
Long.
Control method provided in an embodiment of the present invention, both can apply to pfc circuit, such as shown in Fig. 1
Staggered totem pole pfc circuit shown in single channel totem pole pfc circuit and Fig. 2 is it is also possible to be applied to UPS
In other power conversion circuit such as circuit.
Specifically, in the positive half cycle of the AC-input voltage of power conversion circuit, the master switch on high frequency brachium pontis
Pipe is the switching tube positioned at lower brachium pontis, and continued flow switch pipe is the switching tube positioned at upper brachium pontis；In power conversion electricity
The negative half period of the AC-input voltage on road, the main switch on high frequency brachium pontis is the switching tube positioned at upper brachium pontis,
Continued flow switch pipe is the switching tube positioned at lower brachium pontis.
It should be noted that in control method provided in an embodiment of the present invention, step 301 detection input inductance
Electric current, direct detection can be carried out to the electric current of input inductance it is also possible to by the other parameters of detection for example
On high frequency brachium pontis, the electric current of switching tube, to obtain the electric current of input inductance, realizes the detection of input inductive current.
Further, in control method provided in an embodiment of the present invention, the rate-determining steps of step 302 can be
Detect input inductance electric current trigger when zero point it is also possible to detect input inductance electric current will
Trigger during zero crossing, specifically can be set according to practical application scene, the present invention does not do concrete limit to this
Fixed.
In one particular embodiment of the present invention, above-mentioned first duration can be according to the sense of this input inductance
The AC-input voltage of amount, the electric current of this input inductance and power conversion circuit determines.Specifically, first when
Length can be, but not limited to be determined according to equation below：
Wherein, TonFor the first duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor the electric current of this input inductance,
vinFor the AC-input voltage of power conversion circuit, Δ tonFor turning on compensation dosage；Friendship in power conversion circuit
When stream input voltage instantaneous value is less than the half of bus capacitor Cpfc voltage of power conversion circuit, conducting is mended
The amount of repaying Δ tonCan be 0, be not less than power conversion electricity in the instantaneous AC input voltage of power conversion circuit
During the half of bus capacitor Cpfc voltage on road, turn on compensation dosage Δ tonCan not be 0.
The the first duration T being determined according to above-mentioned formulaonCan also according to uncertain factors such as hardware delay again
It is finely adjusted.
In one particular embodiment of the present invention, the second duration can data setting be rule of thumb to fix
Value, saves calculation resources, controls simple.
In another specific embodiment of the present invention, the second duration can not also be fixed value, for example each
In switch periods, can be determined according to equation below：
Wherein, ToffFor the second duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor the electric current of this input inductance,
vcFor the bus capacitor voltage of power conversion circuit, vinFor the AC-input voltage of power conversion circuit, Δ toff
For turning off compensation dosage.
The determination mode of above-mentioned second duration is merely illustrative, in other specific embodiments of the present invention, second
Duration can also be determined using alternate manner.
Further, in embodiments of the present invention, turn on compensation dosage Δ tonWith shutoff compensation dosage Δ toffCan be
Positive number, zero or negative, can be for fixed compensation amount it is also possible to according to input voltage, output voltage, inductance
Row operation regulation or external circuit compensation are entered in amount change and output loading, and the present invention does not do concrete limit to this
Fixed.
It is applied to the single channel totem pole PFC shown in Fig. 1 below with control method provided in an embodiment of the present invention
As a example circuit, concrete control flow is illustrated.
During the positive half cycle of AC-input voltage of single channel totem pole pfc circuit shown in Fig. 1, power frequency brachium pontis
On switching tube Qsr1 be off state, switching tube Qsr2 is in the conduction state, opening on high frequency brachium pontis
Pass pipe Q2 is main switch, and switching tube Q1 is continued flow switch pipe.When input inductance L1 electric current is detected it is
During by zero crossing, control main switch Q2 is in the conduction state, continued flow switch pipe Q1 is off state,
Now, input inductance L1 electric current rises, and electric current flows through main switch Q2 from AC, switching tube Qsr2 returns
To AC；After the first duration Ton, main switch Q2 is controlled to be off state, continued flow switch pipe
Q1 is in the conduction state, and now, input inductance L1 electric current declines, and electric current flows through continued flow switch pipe from AC
Q1, bus capacitor and load below, switching tube Qsr2 return to AC.By controlling continued flow switch pipe
Q1 turns on duration, i.e. above-mentioned second duration Toff, can allow to input inductance L1 electric current reversely it is possible to
The size of turn-off reversal electric current controlling continued flow switch pipe Q1 is it is ensured that there are enough electric currents to extract and to discharge
The electric charge of the parasitic junction capacitance of main switch Q2 and continued flow switch pipe Q1, thus realize main switch Q2's
No-voltage is open-minded.
During the negative half period of AC-input voltage of single channel totem pole pfc circuit shown in Fig. 1, power frequency brachium pontis
On switching tube Qsr2 be off state, switching tube Qsr1 is in the conduction state, opening on high frequency brachium pontis
Pass pipe Q1 is main switch, and switching tube Q2 is continued flow switch pipe.Concrete control flow inputs electricity with exchanging
The positive half cycle of pressure is similar to, and will not be described in detail herein.
Preferably, in the AC-input voltage zero crossing of power conversion circuit, power conversion can also be controlled
Two switching tubes on power frequency brachium pontis in circuit are simultaneously in off state and specify duration, by power conversion
The AC-input voltage of circuit makes the body diode of the switching tube on power frequency brachium pontis complete Reverse recovery, it is to avoid anti-
Excessive to restoring current.
Also indicate that through experimental data, pfc circuit adopts control method provided in an embodiment of the present invention, can
Realize the function of power conversion with simple algorithm, and be capable of the no-voltage of high frequency bridge arm switch pipe opening
Logical.
Based on same inventive concept, the controlling party of the power conversion circuit being provided according to the above embodiment of the present invention
Method, correspondingly, the embodiment of the present invention also provides a kind of control device of power conversion circuit, as shown in figure 4,
Including：
Detector unit 401, for inputting inductance for each in power conversion circuit, detects this input electricity
The electric current of sense；
Control unit 402, for when the current zero-crossing point of this input inductance is detected, controlling this input electricity
Main switch the first duration in the conduction state on high frequency brachium pontis that sense connects, and control this input inductance even
The continued flow switch pipe on high frequency brachium pontis connecing is off state；Controlling, this main switch is in the conduction state
After first duration, control this main switch to be off state, and control this continued flow switch pipe to be on shape
State second duration.
Wherein, in the positive half cycle of the AC-input voltage of power conversion circuit, the main switch on high frequency brachium pontis
It is the switching tube positioned at lower brachium pontis, continued flow switch pipe is the switching tube positioned at upper brachium pontis；In power conversion circuit
AC-input voltage negative half period, the main switch on high frequency brachium pontis is the switching tube positioned at upper brachium pontis, continue
Stream switching tube is the switching tube positioned at lower brachium pontis.
Preferably, control unit 402, specifically for the first duration is determined according to equation below：
Wherein, TonFor the first duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor the electric current of this input inductance,
vinFor the AC-input voltage of power conversion circuit, Δ tonFor turning on compensation dosage.
Further, control unit 402, specifically for determining the second duration according to equation below：
Wherein, ToffFor the second duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor the electric current of this input inductance,
vcFor the bus capacitor voltage of power conversion circuit, vinFor the AC-input voltage of power conversion circuit, Δ toff
For turning off compensation dosage.
Preferably, control unit 402, it is additionally operable in the AC-input voltage zero crossing of power conversion circuit,
Control two switching tubes on the power frequency brachium pontis in power conversion circuit to be simultaneously in off state and specify duration.
In sum, using the control program of power conversion circuit provided in an embodiment of the present invention, it is capable of
The no-voltage of high frequency bridge arm switch pipe is open-minded, reduces circuit loss, improves circuit efficiency.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these modification 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 changes and modification.
Claims (10)
1. a kind of control method of power conversion circuit is it is characterised in that include：
Input inductance for each in power conversion circuit, detect the electric current of this input inductance；
When the current zero-crossing point of this input inductance is detected, control on the high frequency brachium pontis of this input inductance connection
Main switch the first duration in the conduction state, and control continuous on the high frequency brachium pontis of this input inductance connection
Stream switching tube is off state；
After controlling this main switch the first duration in the conduction state, this main switch is controlled to be off shape
State, and control this continued flow switch pipe the second duration in the conduction state.
2. the method for claim 1 is it is characterised in that the exchange in power conversion circuit inputs
The positive half cycle of voltage, the main switch on high frequency brachium pontis is the switching tube positioned at lower brachium pontis, and continued flow switch pipe is
Switching tube positioned at upper brachium pontis；
Main switch on the negative half period of the AC-input voltage of power conversion circuit, high frequency brachium pontis be positioned at
The switching tube of upper brachium pontis, continued flow switch pipe is the switching tube positioned at lower brachium pontis.
3. method as claimed in claim 1 or 2 is it is characterised in that described first duration is according to as follows
Formula determines：
Wherein, TonFor described first duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor this input inductance
Electric current, vinFor the AC-input voltage of power conversion circuit, Δ tonFor turning on compensation dosage.
4. method as claimed in claim 1 or 2 is it is characterised in that described second duration is according to as follows
Formula determines：
Wherein, ToffFor described second duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor this input inductance
Electric current, vcFor the bus capacitor voltage of power conversion circuit, vinFor the AC-input voltage of power conversion circuit,
ΔtoffFor turning off compensation dosage.
5. method as claimed in claim 1 or 2 is it is characterised in that also include：
In the AC-input voltage zero crossing of power conversion circuit, control the power frequency bridge in power conversion circuit
Two switching tubes on arm are simultaneously in off state and specify duration.
6. a kind of control device of power conversion circuit is it is characterised in that include：
Detector unit, for inputting inductance for each in power conversion circuit, detects this input inductance
Electric current；
Control unit, for when the current zero-crossing point of this input inductance is detected, controlling this input inductance even
The first duration in the conduction state of the main switch on high frequency brachium pontis connecing, and control this input inductance connection
Continued flow switch pipe on high frequency brachium pontis is off state；Controlling this main switch in the conduction state first
After duration, control this main switch to be off state, and control this continued flow switch pipe in the conduction state
Two durations.
7. device as claimed in claim 6 is it is characterised in that the exchange in power conversion circuit inputs
The positive half cycle of voltage, the main switch on high frequency brachium pontis is the switching tube positioned at lower brachium pontis, and continued flow switch pipe is
Switching tube positioned at upper brachium pontis；
Main switch on the negative half period of the AC-input voltage of power conversion circuit, high frequency brachium pontis be positioned at
The switching tube of upper brachium pontis, continued flow switch pipe is the switching tube positioned at lower brachium pontis.
8. device as claimed in claims 6 or 7, it is characterised in that described control unit, is specifically used
In described first duration is determined according to equation below：
Wherein, TonFor described first duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor this input inductance
Electric current, vinFor the AC-input voltage of power conversion circuit, Δ tonFor turning on compensation dosage.
9. device as claimed in claims 6 or 7, it is characterised in that described control unit, is specifically used
In described second duration is determined according to equation below：
Wherein, ToffFor described second duration, LpfcFor the sensibility reciprocal of this input inductance, iinFor this input inductance
Electric current, vcFor the bus capacitor voltage of power conversion circuit, vinFor the AC-input voltage of power conversion circuit,
ΔtoffFor turning off compensation dosage.
10. device as claimed in claims 6 or 7, it is characterised in that described control unit, is additionally operable to
In the AC-input voltage zero crossing of power conversion circuit, control on the power frequency brachium pontis in power conversion circuit
Two switching tubes be simultaneously in off state specify duration.
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| CN201510549080.0A CN106487207B (en) | 2015-08-31 | 2015-08-31 | A kind of control method and device of power conversion circuit |
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| CN201510549080.0A CN106487207B (en) | 2015-08-31 | 2015-08-31 | A kind of control method and device of power conversion circuit |
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| CN106487207B CN106487207B (en) | 2019-02-22 |
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| CN111049368A (en) * | 2019-12-16 | 2020-04-21 | 深圳麦格米特电气股份有限公司 | Soft switch control method, totem-pole bridgeless circuit and totem-pole bridgeless system |
| CN112440767A (en) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | Charging control method, system and storage medium thereof |
| CN112440768A (en) * | 2019-09-05 | 2021-03-05 | 比亚迪股份有限公司 | Charging control method, charging control module and storage medium thereof |
| CN112803745A (en) * | 2020-12-31 | 2021-05-14 | 广东美的制冷设备有限公司 | Current control method, device and storage medium |
| CN114056132A (en) * | 2020-08-05 | 2022-02-18 | 比亚迪股份有限公司 | Charge-discharge control method, vehicle-mounted charging system and vehicle |
| CN114070033A (en) * | 2020-08-05 | 2022-02-18 | 比亚迪股份有限公司 | Control method and control device of power factor correction module |
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| CN112803745A (en) * | 2020-12-31 | 2021-05-14 | 广东美的制冷设备有限公司 | Current control method, device and storage medium |
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| Publication number | Publication date |
|---|---|
| CN106487207B (en) | 2019-02-22 |
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