CN106487207B - A kind of control method and device of power conversion circuit - Google Patents
A kind of control method and device of power conversion circuit Download PDFInfo
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- CN106487207B CN106487207B CN201510549080.0A CN201510549080A CN106487207B CN 106487207 B CN106487207 B CN 106487207B CN 201510549080 A CN201510549080 A CN 201510549080A CN 106487207 B CN106487207 B CN 106487207B
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- bridge arm
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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 and device of power conversion circuit, and the no-voltage that can be realized high frequency bridge arm switch pipe is open-minded, reduce circuit loss, improve circuit efficiency.The control method includes: to detect the electric current of the input inductance for each input inductance in power conversion circuit；When detecting the current zero-crossing point of the input inductance, main switch the first duration in the conductive state on the high frequency bridge arm of the input inductance connection is controlled, and the continued flow switch pipe controlled on the high frequency bridge arm of the input inductance connection is in an off state；After controlling the main switch the first duration in the conductive state, it is in an off state to control the main switch, and control the continued flow switch pipe the second duration in the conductive state.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of control method and device of power conversion circuit.
Background technique
Power conversion circuit includes PFC (Power Factor Correction, PFC) circuit, UPS
(Uninterrupted Power Supply, uninterruptible power supply) circuit etc., by taking pfc circuit as an example, to power conversion circuit
Structure and existing control method are briefly described.
Efficient pfc circuit mainly includes single channel totem pfc circuit shown in FIG. 1 and friendship shown in Fig. 2 in the prior art
Wrong totem pfc circuit.In single channel totem pfc circuit shown in FIG. 1, switching tube Qsr1 and Qsr2 constitute a power frequency bridge
Arm, the power frequency bridge arm can also be made of two diodes, and switching tube Q1 and Q2 constitute a high frequency bridge arm, the high frequency bridge arm
Midpoint is connected by an input inductance L1 with input AC source；In staggeredly totem pfc circuit shown in Fig. 2, switching tube
Qsr1 and Qsr2 constitutes a power frequency bridge arm, which can also be made of two diodes, and switching tube Q1~Q2n is constituted
N high frequency bridge arm, the midpoint of the n high frequency bridge arm pass through an input inductance and friendship in n input inductance L1~Ln respectively
Input source is flowed to be connected.
A kind of more common control method of two kinds of pfc circuits be CRM (Critical Conduction Mode, it is critical
Conduction mode) control.However, CRM control is less than bus capacitor Cpfc voltage in the instantaneous AC input voltage of pfc circuit
The no-voltage that can be realized high frequency bridge arm upper switch pipe when half is open-minded, but is greater than bus capacitor in instantaneous AC input voltage
It can not realize that the no-voltage of high frequency bridge arm upper switch pipe is open-minded when the half of Cpfc voltage, cause circuit loss larger.
Summary of the invention
The embodiment of the present invention provides a kind of control method and device of power conversion circuit, deposits in the prior art to solve
High frequency bridge arm on switching tube cannot achieve the problem that no-voltage opens.
The embodiment of the invention provides a kind of control methods of power conversion circuit, comprising:
For each input inductance in power conversion circuit, the electric current of the input inductance is detected；
When detecting the current zero-crossing point of the input inductance, the master controlled on the high frequency bridge arm of the input inductance connection is opened
It closes and manages the first duration in the conductive state, and the continued flow switch pipe controlled on the high frequency bridge arm of the input inductance connection is off
State；
After controlling the main switch the first duration in the conductive state, it is in an off state to control the main switch, and
Control the continued flow switch pipe the second duration in the conductive state.
The embodiment of the invention also provides a kind of control devices of power conversion circuit, comprising:
Detection unit, for detecting the electric current of the input inductance for each input inductance in power conversion circuit；
Control unit, for controlling the height of the input inductance connection when detecting the current zero-crossing point of the input inductance
Main switch the first duration in the conductive state on frequency bridge arm, and control the afterflow on the high frequency bridge arm of the input inductance connection
Switching tube is in an off state；After controlling the main switch the first duration in the conductive state, controls the main switch and be in
Off state, and control the continued flow switch pipe the second duration in the conductive state.
The beneficial effect comprise that
In scheme provided in an embodiment of the present invention, the electric current of detection input inductance, when the electric current mistake for detecting input inductance
When zero point, main switch the first duration in the conductive state on the high frequency bridge arm of the input inductance connection is controlled, and controlling should
The continued flow switch pipe inputted on the high frequency bridge arm of inductance connection is in an off state；Controlling, the main switch is in the conductive state
After first duration, it is in an off state to control the main switch, and controls the continued flow switch pipe the second duration in the conductive state.
By controlling the conducting duration of continued flow switch pipe, it is reversed to can permit input inductive current, and can control continued flow switch pipe
The size of turn-off reversal electric current guarantees to have enough electric currents to extract and discharge the parasitic knot electricity of main switch and continued flow switch pipe
The charge of appearance, to realize that the no-voltage of switching tube is open-minded.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, is implemented with the present invention
Example is used to explain 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 pfc circuit；
Fig. 2 is the schematic diagram of staggeredly totem 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 bridge arm switch tube zero voltage is opened, the embodiment of the present invention
A kind of control method and device of power conversion circuit are provided, the preferred embodiment of the present invention is carried out in conjunction with Figure of description
Explanation, it should be understood that preferred embodiments described herein are only used to illustrate and explain the present invention, is not used to limit this hair
It is bright.And in the absence of conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.
The embodiment of the invention provides a kind of control methods of power conversion circuit, as shown in figure 3, may include walking as follows
It is rapid:
Step 301, for each input inductance in power conversion circuit, detect the electric current of the input inductance；
Step 302, when detecting the current zero-crossing point of the input inductance, control the high frequency bridge arm of the input inductance connection
On main switch the first duration in the conductive state, and control the continued flow switch pipe on the high frequency bridge arm of the input inductance connection
It is in an off state；After controlling the main switch the first duration in the conductive state, controls the main switch and be off shape
State, and control the continued flow switch pipe the second duration in the conductive state.
Control method provided in an embodiment of the present invention both can be applied to pfc circuit, such as single channel totem shown in FIG. 1
Column pfc circuit and staggeredly totem pfc circuit shown in Fig. 2, also can be applied to other power conversion circuits such as UPS circuit
In.
Specifically, the positive half cycle of the AC-input voltage in power conversion circuit, the main switch on high frequency bridge arm is position
In the switching tube of lower bridge arm, continued flow switch pipe is the switching tube positioned at upper bridge arm；In the AC-input voltage of power conversion circuit
Negative half period, the main switch on high frequency bridge arm is the switching tube positioned at upper bridge arm, and continued flow switch pipe is opening positioned at lower bridge arm
Guan Guan.
It should be noted that in control method provided in an embodiment of the present invention, the electric current of step 301 detection input inductance,
The electric current of input inductance can directly be detected, it can also be by detecting other parameter such as high frequency bridge arm upper switch pipes
Electric current inputs the electric current of inductance to obtain, and 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 detect it is defeated
Enter electric current triggering when zero point of inductance, can also be triggered when detecting the electric current for inputting inductance i.e. by zero crossing, specifically
It can be set according to practical application scene, the present invention is not specifically limited in this embodiment.
In one particular embodiment of the present invention, above-mentioned first duration can according to the sensibility reciprocal of the input inductance, this is defeated
The AC-input voltage of the electric current and power conversion circuit that enter inductance determines.Specifically, the first duration can be, but not limited to basis
Following formula determines:
Wherein, TonFor the first duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vinFor function
The AC-input voltage of rate translation circuit, Δ tonFor compensation rate is connected；In the instantaneous AC input voltage of power conversion circuit
Less than the bus capacitor Cpfc voltage of power conversion circuit half when, be connected compensation rate Δ tonIt can be 0, in power conversion electricity
When the instantaneous AC input voltage on road is not less than the half of the bus capacitor Cpfc voltage of power conversion circuit, compensation rate is connected
ΔtonIt can not be 0.
The the first duration T determined according to above-mentioned formulaonIt can also be carried out again according to uncertain factors such as hardware delay micro-
It adjusts.
In one particular embodiment of the present invention, the second duration can data setting be rule of thumb fixed value, save
Calculation resources, control are simple.
In another specific embodiment of the invention, the second duration can not also be fixed value, such as each switch week
In phase, it can determine according to the following formula:
Wherein, ToffFor the second duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vcFor function
The bus capacitor voltage of rate translation circuit, vinFor the AC-input voltage of power conversion circuit, Δ toffTo turn off compensation rate.
The method of determination of above-mentioned second duration is merely illustrative, in other specific embodiments of the invention, the second duration
It can be determined using other way.
Further, in embodiments of the present invention, compensation rate Δ t is connectedonWith shutdown compensation rate Δ toffCan for positive number,
Zero or negative, it can be fixed compensation amount, it can also be according to input voltage, output voltage, inductance variation and output loading
It carries out operation adjusting or external circuit compensation, the present invention is not specifically limited in this embodiment.
Below by taking control method provided in an embodiment of the present invention is applied to single channel totem pfc circuit shown in FIG. 1 as an example,
Specific control flow is illustrated.
The switch when positive half cycle of the AC-input voltage of single channel totem pfc circuit shown in Fig. 1, on power frequency bridge arm
Pipe Qsr1 is in an off state, and switching tube Qsr2 is in the conductive state, and the switching tube Q2 on high frequency bridge arm is main switch, switch
Pipe Q1 is continued flow switch pipe.When detecting input inductance L1 electric current i.e. by zero crossing, control main switch Q2 is on shape
State, continued flow switch pipe Q1 are in an off state, at this point, input inductance L1 electric current rises, electric current flows through main switch Q2 from AC, opens
It closes pipe Qsr2 and returns to AC；After the first duration Ton, control main switch Q2 is in an off state, and continued flow switch pipe Q1 is in
On state, at this point, input inductance L1 electric current decline, electric current flow through continued flow switch pipe Q1, bus capacitor and subsequent from AC
Load, switching tube Qsr2 return to AC.Duration, i.e., above-mentioned second duration T is connected by control continued flow switch pipe Q1off, can permit
It is reversed to input inductance L1 electric current, and can control the size of the turn-off reversal electric current of continued flow switch pipe Q1, guarantee there are enough electricity
Stream extracts and discharges the charge of the parasitic junction capacitance of main switch Q2 and continued flow switch pipe Q1, to realize main switch Q2's
No-voltage is open-minded.
The switch when negative half period of the AC-input voltage of single channel totem pfc circuit shown in Fig. 1, on power frequency bridge arm
Pipe Qsr2 is in an off state, and switching tube Qsr1 is in the conductive state, and the switching tube Q1 on high frequency bridge arm is main switch, switch
Pipe Q2 is continued flow switch pipe.Specific control flow is similar with the positive half cycle of AC-input voltage, and this will not be detailed here.
Preferably, can also be controlled in power conversion circuit in the AC-input voltage zero crossing of power conversion circuit
Power frequency bridge arm on two switching tubes specified duration in an off state simultaneously, electricity is inputted by the exchange of power conversion circuit
Pressure makes the body diode of the switching tube on power frequency bridge arm complete Reverse recovery, avoids reverse recovery current excessive.
It is also indicated that by experimental data, pfc circuit uses control method provided in an embodiment of the present invention, can be calculated with simple
Method realizes the function of power conversion, and the no-voltage that can be realized high frequency bridge arm switch pipe is open-minded.
Based on the same inventive concept, the control method of the power conversion circuit provided according to that above embodiment of the present invention, phase
Ying Di, the embodiment of the present invention also provide a kind of control device of power conversion circuit, as shown in Figure 4, comprising:
Detection unit 401, for detecting the electricity of the input inductance for each input inductance in power conversion circuit
Stream；
Control unit 402, for controlling the input inductance connection when detecting the current zero-crossing point of the input inductance
Main switch the first duration in the conductive state on high frequency bridge arm, and control continuous on the high frequency bridge arm of the input inductance connection
It is in an off state to flow switching tube；After controlling the main switch the first duration in the conductive state, control at the main switch
In off state, and control the continued flow switch pipe the second duration in the conductive state.
Wherein, the main switch in the positive half cycle of the AC-input voltage of power conversion circuit, high frequency bridge arm be positioned at
The switching tube of lower bridge arm, continued flow switch pipe are the switching tube positioned at upper bridge arm；In the AC-input voltage of power conversion circuit
Negative half period, the main switch on high frequency bridge arm are the switching tube positioned at upper bridge arm, and continued flow switch pipe is the switch positioned at lower bridge arm
Pipe.
Preferably, control unit 402, is specifically used for determining the first duration according to the following formula:
Wherein, TonFor the first duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vinFor function
The AC-input voltage of rate translation circuit, Δ tonFor compensation rate is connected.
Further, control unit 402 are specifically used for determining the second duration according to the following formula:
Wherein, ToffFor the second duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vcFor function
The bus capacitor voltage of rate translation circuit, vinFor the AC-input voltage of power conversion circuit, Δ toffTo turn off compensation rate.
Preferably, control unit 402, is also used in the AC-input voltage zero crossing of power conversion circuit, function is controlled
Two switching tubes while specified duration in an off state on power frequency bridge arm in rate translation circuit.
In conclusion can be realized high frequency bridge using the control program of power conversion circuit provided in an embodiment of the present invention
The no-voltage of arm switch pipe is open-minded, reduces circuit loss, improves circuit efficiency.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of control method of power conversion circuit characterized by comprising
For each input inductance in power conversion circuit, the electric current of the input inductance is detected；
When detecting the current zero-crossing point of the input inductance, the main switch on the high frequency bridge arm of the input inductance connection is controlled
First duration in the conductive state, and the continued flow switch pipe controlled on the high frequency bridge arm of the input inductance connection is off shape
State；
After controlling the main switch the first duration in the conductive state, it is in an off state to control the main switch, and control
The continued flow switch pipe the second duration in the conductive state,
Second duration determines according to the following formula:
Wherein, ToffFor second duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vcFor function
The bus capacitor voltage of rate translation circuit, vinFor the AC-input voltage of power conversion circuit, Δ toffTo turn off compensation rate.
2. the method as described in claim 1, which is characterized in that in the positive half cycle of the AC-input voltage of power conversion circuit,
Main switch on high frequency bridge arm is the switching tube positioned at lower bridge arm, and continued flow switch pipe is the switching tube positioned at upper bridge arm；
Main switch on the negative half period of the AC-input voltage of power conversion circuit, high frequency bridge arm is opening positioned at upper bridge arm
Guan Guan, continued flow switch pipe are the switching tube positioned at lower bridge arm.
3. method according to claim 1 or 2, which is characterized in that first duration determines according to the following formula:
Wherein, TonFor first duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vinFor function
The AC-input voltage of rate translation circuit, Δ tonFor compensation rate is connected.
4. method according to claim 1 or 2, which is characterized in that further include:
In the AC-input voltage zero crossing of power conversion circuit, two on the power frequency bridge arm in power conversion circuit are controlled
Switching tube while specified duration in an off state.
5. a kind of control device of power conversion circuit characterized by comprising
Detection unit, for detecting the electric current of the input inductance for each input inductance in power conversion circuit；
Control unit, for controlling the high frequency bridge of the input inductance connection when detecting the current zero-crossing point of the input inductance
Main switch the first duration in the conductive state on arm, and control the continued flow switch on the high frequency bridge arm of the input inductance connection
It manages in an off state；After controlling the main switch the first duration in the conductive state, controls the main switch and be off
State, and the continued flow switch pipe the second duration in the conductive state is controlled,
Described control unit also particularly useful for determining second duration according to the following formula:
Wherein, ToffFor second duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vcFor function
The bus capacitor voltage of rate translation circuit, vinFor the AC-input voltage of power conversion circuit, Δ toffTo turn off compensation rate.
6. device as claimed in claim 5, which is characterized in that in the positive half cycle of the AC-input voltage of power conversion circuit,
Main switch on high frequency bridge arm is the switching tube positioned at lower bridge arm, and continued flow switch pipe is the switching tube positioned at upper bridge arm；
Main switch on the negative half period of the AC-input voltage of power conversion circuit, high frequency bridge arm is opening positioned at upper bridge arm
Guan Guan, continued flow switch pipe are the switching tube positioned at lower bridge arm.
7. such as device described in claim 5 or 6, which is characterized in that described control unit is specifically used for according to the following formula really
Fixed first duration:
Wherein, TonFor first duration, LpfcFor the sensibility reciprocal of the input inductance, iinFor the electric current of the input inductance, vinFor function
The AC-input voltage of rate translation circuit, Δ tonFor compensation rate is connected.
8. such as device described in claim 5 or 6, which is characterized in that described control unit is also used in power conversion circuit
When AC-input voltage zero crossing, controls two switching tubes on the power frequency bridge arm in power conversion circuit and be off shape simultaneously
State specifies 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112440767B (en) * | 2019-08-30 | 2022-09-09 | 比亚迪股份有限公司 | Charging control method, system and storage medium thereof |
| CN112440768B (en) * | 2019-09-05 | 2022-07-15 | 比亚迪股份有限公司 | Charging control method, charging control module and storage medium thereof |
| CN111049368B (en) * | 2019-12-16 | 2021-02-26 | 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 |
| CN114056132B (en) * | 2020-08-05 | 2023-12-12 | 比亚迪股份有限公司 | Charging and discharging 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 |
| CN112803745B (en) * | 2020-12-31 | 2022-05-27 | 广东美的制冷设备有限公司 | Current control method, device and storage medium |
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| CN101707441A (en) * | 2009-11-26 | 2010-05-12 | 华为技术有限公司 | Totem-pole bridgeless circuit system and current sampling device |
| CN102035364A (en) * | 2010-12-02 | 2011-04-27 | 成都芯源系统有限公司 | Bridgeless power factor correction converter and control method thereof |
| CN102130580A (en) * | 2011-03-30 | 2011-07-20 | 艾默生网络能源系统北美公司 | Totem-pole bridgeless power factor correction circuit |
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| US9431896B2 (en) * | 2013-12-19 | 2016-08-30 | Texas Instruments Incorporated | Apparatus and method for zero voltage switching in bridgeless totem pole power factor correction converter |
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| CN101707441A (en) * | 2009-11-26 | 2010-05-12 | 华为技术有限公司 | Totem-pole bridgeless circuit system and current sampling device |
| CN102035364A (en) * | 2010-12-02 | 2011-04-27 | 成都芯源系统有限公司 | Bridgeless power factor correction converter and control method thereof |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Applicant after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Applicant before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20201012 Address after: Ohio, USA Patentee after: Dimension Corp. Address before: 1510 Kansas Avenue, Loren, Ohio, USA Patentee before: Emerson Energy Systems, AB |