CN112803745A - Current control method, device and storage medium - Google Patents
Current control method, device and storage medium Download PDFInfo
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- CN112803745A CN112803745A CN202011625214.XA CN202011625214A CN112803745A CN 112803745 A CN112803745 A CN 112803745A CN 202011625214 A CN202011625214 A CN 202011625214A CN 112803745 A CN112803745 A CN 112803745A
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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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- 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 embodiment of the application provides a current control method, a device and a storage medium, which are applied to the following steps: the inductor and the rectifying circuit connected with the inductor; wherein the method is for: determining the current value of alternating current input by the inductor; determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current; outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed; controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a current control method, device and storage medium.
Background
In a Totem Pole Power (Totem Pole) type Power Factor Correction (PFC) loop, the charging current of the inductor is small when the Alternating Current (AC) line voltage becomes low and near the zero crossing point. Maintaining a given switching frequency, using a smaller inductance, in the case of discontinuous and small currents, once the energy stored by the inductor is released, current flows from the capacitor back to the AC line, and a reverse current occurs.
In the prior art, the inductance is increased only by increasing the number of turns of the coil of the inductance, so that the effect of increasing the energy stored in the inductor is achieved. Under the condition of discontinuous and small current, the time for the inductor to release the stored energy is increased, so that the Totem Pole type PFC loop is controlled not to generate reverse current. However, the way of preventing reverse current increases copper loss, increases the volume of the inductor in the loop, and increases the cost; and for different circuits, the corresponding calculation and adjustment of the inductance in the circuit are required, and the method cannot be flexibly applied to different Totem pol type PFC loops, and has low efficiency.
Disclosure of Invention
The embodiment of the invention provides a current control method, a current control device and a storage medium.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a current control method, which is applied to a device comprising: in inductance and the rectifier circuit who is connected with inductance, include:
determining the current value of alternating current input by the inductor;
determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current;
outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
In the foregoing solution, the determining a phase interval of a reverse current voltage phase control condition in the input current according to a current value of the input current includes:
according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point;
determining a second phase point according to the first phase point;
and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
In the foregoing solution, the current value of the input current satisfies a first preset condition, including:
the current value of the input current is a negative value,
and/or the presence of a gas in the gas,
the current value of the input current is equal to zero.
In the foregoing scheme, the current value of the input current satisfies a first preset condition, and further includes:
the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value;
and/or the presence of a gas in the gas,
the minimum current value of the inductive current in one switching period is less than zero;
wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
In the foregoing solution, the controlling the rectifier circuit to be in the second rectification state in the phase interval includes:
determining the input voltage of the alternating current input by the inductor in the phase interval;
and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
In the foregoing solution, when the input voltage meets a second preset condition, controlling the rectifier circuit to be in a second rectification state includes:
when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and is less than or equal to a second voltage threshold value, controlling the second switching tube to be in an off state.
In the foregoing scheme, when the input voltage meets a second preset condition, the controlling the rectifying circuit to be in a second rectifying state further includes:
when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite;
and/or the presence of a gas in the gas,
when the input voltage is in a negative half period and is less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite;
wherein the on state and the off state are opposite switching states.
In the foregoing scheme, when the input voltage meets a second preset condition, the controlling the rectifying circuit to be in a second rectifying state further includes:
when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
In the foregoing solution, the controlling the rectifier circuit to be in the second rectification state in the phase interval includes:
and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
In the above scheme, the method further comprises:
the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube;
the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube;
the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
The embodiment of the invention also provides a current control device, which is applied to the following parts: in an inductor and a rectifier circuit connected to the inductor, the apparatus comprising: the device comprises a first determination module, a second determination module, a first control module and a second control module; wherein the content of the first and second substances,
the first determining module is used for determining the current value of the alternating current input by the inductor;
the second determining module is used for determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current;
the first control module is used for controlling the rectifying circuit to be in a first rectifying state outside the phase interval; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
the second control module is used for controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
In the foregoing solution, the second determining module is specifically configured to:
according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point;
determining a second phase point according to the first phase point;
and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
In the foregoing solution, the second determining module is further configured to determine that the current value of the input current satisfies a first preset condition, and includes:
the current value of the input current is a negative value,
and/or the presence of a gas in the gas,
the current value of the input current is equal to zero.
In the foregoing solution, the second determining module is specifically further configured to determine that the current value of the input current meets a first preset condition, and further includes:
the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value;
and/or the presence of a gas in the gas,
the minimum current value of the inductive current in one switching period is less than zero;
wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
In the foregoing solution, the second control module is specifically configured to:
determining the input voltage of the alternating current input by the inductor in the phase interval;
and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
In the foregoing solution, the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and is less than or equal to a second voltage threshold value, controlling the second switching tube to be in an off state.
In the foregoing solution, the execution module is further configured to:
skipping operation of the security check upon determining that the patch thread does not require the security check.
In the foregoing solution, the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite;
and/or the presence of a gas in the gas,
when the input voltage is in a negative half period and is less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite;
wherein the on state and the off state are opposite switching states.
In the foregoing solution, the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
In the foregoing solution, the second control module is further configured to:
and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
In the above scheme, the apparatus further comprises:
the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube;
the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube;
the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
An embodiment of the present invention further provides a current control apparatus, where the apparatus includes: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to execute the steps provided in any of the above embodiments when the computer program is executed.
The embodiment of the invention also provides a computer storage medium, which is characterized in that the computer storage medium stores computer executable instructions; the computer-executable instructions can be used for realizing the method provided by any one of the above embodiments after being executed by a processor.
In the embodiment of the invention, a reverse current voltage phase interval in which current reverse flow can occur is determined according to the determined current value of alternating current input by the inductor, and in the phase interval, the current in the Totem pol type PFC loop always keeps flowing out in the forward direction by controlling the switching states of a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in a rectifying circuit. By controlling the state of a switching tube in the rectifier circuit, under the condition of not changing the number of turns of an inductance coil, even though the current passing through the inductance in the loop is discontinuous and small, the current in the loop can not generate reverse flow, and the efficiency is improved; meanwhile, the increase of copper loss is reduced, the increase of the size of an inductor in a loop is avoided, and the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a current control method provided by the present invention;
FIG. 2 is a schematic diagram of a second commutation state provided herein;
FIG. 3 is a schematic diagram of another second commutation state provided by the present invention;
FIG. 4 is a schematic diagram of another second commutation state provided by the present invention;
FIG. 5 is a schematic diagram of another second commutation state provided by the present invention;
FIG. 6 is a schematic diagram of a conventional current control method provided by the present invention;
FIG. 7 is a schematic structural diagram of a current control apparatus provided in the present application;
FIG. 8 is a schematic structural diagram of another current control apparatus provided in the present application;
fig. 9 is a waveform diagram illustrating the effect of the second rectifying state provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict. The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to be limiting of the invention.
The embodiment of the invention provides a current control method. FIG. 1 is a schematic flow chart of a current control method according to the present invention; as shown in fig. 1, the method includes:
step S101: determining the current value of alternating current input by the inductor;
step S102: determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current;
step S103: outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
step S104: controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
Furthermore, the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube;
the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube;
the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
Specifically, the control circuit is respectively configured to output control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in an on state or an off state, and may be: the control loop respectively provides pulse signals for the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, and the switch tubes are switched on or off according to the received pulse signals. When receiving the high level, the switching tube keeps a conducting state; when receiving the low level, the switch tube keeps the off state.
In some embodiments, the switching tube is an MOS tube, and a gate of the MOS tube is a control end and is connected to the control loop; the source electrode of the MOS tube is a power supply input end, and the drain electrode of the MOS tube is a power supply output end; the on and off of the MOS tube is controlled by the voltage of the grid, and when the grid voltage is low level, namely low voltage is received, the MOS tube is in an off state; when the grid voltage is positive voltage, namely receives high level, the MOS tube is in a conducting state. The switching tube may also be an IGBT, sic, GaN, or the like, and is not particularly limited herein.
In an embodiment, the Pulse signals received by the first switching tube and the second switching tube may be high frequency Pulse Width Modulation (PWM) output signals; the pulse signals received by the third switching tube and the fourth switching tube can be power frequency pulse signals.
In another embodiment, the pulse signals received by the first switching tube and the second switching tube may be power frequency pulse signals; the pulse signals received by the third switching tube and the fourth switching tube may be high-frequency PWM output signals.
Specifically, in step S101, the alternating current is a current whose current direction changes periodically with time, and the average current in one cycle is zero; the waveform of the alternating current may be a triangular wave, a square wave, a sine wave, and the like. In this embodiment, the ac waveform is a sine wave. And measuring the current value of the alternating current flowing into the input end of the inductor.
Specifically, in step S102, the phase interval for determining the reverse current voltage phase control condition in the input current may be a phase interval for determining a voltage phase of the input voltage corresponding to the input current in which the current reverse current may occur, in the determined input current.
Specifically, the voltage phase is a physical quantity reflecting the state of the alternating current at any time; in the present embodiment, the input current is a sinusoidal alternating current, and the alternating voltage can be calculated by u ═ Usin2 pi ft. Where U is the instantaneous value of the alternating voltage, U is the maximum value of the alternating voltage, f is the frequency of the alternating current, and t is the time. Over time, the ac voltage may go from zero to a maximum, from a maximum to zero, from zero to a negative maximum, and from a negative maximum to zero. In the trigonometric function 2 pi ft corresponds to an angle which reflects the state of the alternating current at any moment, whether it is increasing or decreasing, whether it is positive or negative, etc. Therefore, in the field of alternating current, 2 π ft is called the voltage phase, or voltage phase; when the signal waveform changes in a periodic manner, the waveform cycles through 360 °.
Specifically, in step S103, the controlling the rectifier circuit to be in the first rectification state outside the phase interval may be: when the voltage of the input voltage is outside the phase interval of the countercurrent voltage phase control condition, the phenomenon of current countercurrent cannot occur under the input voltage, and at the moment, the control rectification circuit is in a traditional control mode, namely a first rectification state. Here, in the conventional mode, the pulse signal periods received by the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit are not changed;
specifically, as shown in fig. 6, fig. 6 is a schematic diagram of a conventional current control method provided by the present invention; in the first rectification state, when the voltage value of the input voltage is a positive value and is greater than or equal to a seventh voltage threshold value, the control loop outputs a control signal for controlling the fourth switching tube to be in a conducting state, namely the control signal is a power frequency pulse signal output by the fourth switching tube; when the voltage value of the input voltage is a negative value and is less than or equal to the eighth voltage threshold, the control circuit outputs a control signal for controlling the third switch tube to be in a conducting state, namely the third switch tube outputs a power frequency pulse signal; the control loop is characterized in that the periods of the power frequency pulse signals output by the third switching tube and the fourth switching tube are both customized, and the periods cannot be changed in the traditional control mode process.
When the power frequency pulse signal received by the third switch tube or the fourth switch tube is at a high level, the third switch tube or the fourth switch tube is in a conducting state; when the third switch tube or the fourth switch tube is in a conducting state, the control loop outputs high-frequency PWM pulse signals to the first switch tube and the second switch tube, wherein the periods of the high-frequency PWM pulse signals output by the first switch tube and the second switch tube are both customized and cannot be changed in the traditional control mode process.
In step S104, the controlling the rectifier circuit to be in the second rectification state in the phase interval may be: when the voltage of the input voltage is in the phase interval of the countercurrent voltage phase control condition, the phenomenon of current countercurrent can be generated under the input voltage, and at the moment, the control rectification circuit is in a countercurrent rectification state, namely a second rectification state.
In the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state. In some embodiments, the period of the pulse signal may be changed to be longer or shorter.
It should be noted that, when the conventional current control method is used, the current in the Totem Pole-type PFC loop will flow backwards within a certain interval. In the prior art, the inductance is increased by increasing the number of turns of the coil of the inductance, so that the effect of increasing the energy stored in the inductor is achieved, the time for releasing the stored energy is increased under the condition that the inductance is discontinuous and the current is small, and the Totem pol type PFC loop is controlled not to generate reverse current. However, the way of preventing reverse current increases copper loss, increases the volume of the inductor in the loop, and increases the cost; and for different circuits, the corresponding calculation and adjustment of the inductance in the circuit are required, and the method cannot be flexibly applied to different Totem pol type PFC loops, and has low efficiency.
In this embodiment, a reverse current voltage phase interval in which a current reverse flow occurs is determined according to the determined current value of the alternating current input by the inductor, and in the phase interval, the switching state of each switching tube is controlled by controlling the period of the pulse signal on the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectifying circuit, so that the current in the Totem Pole PFC loop always keeps flowing out in the forward direction. By controlling the state of a switching tube in the rectifier circuit, under the condition of not changing the number of turns of an inductance coil, even though the current passing through the inductance in the loop is discontinuous and small, the current in the loop can not generate reverse flow, and the efficiency is improved; meanwhile, the increase of copper loss is reduced, the increase of the size of an inductor in a loop is avoided, and the cost is reduced.
Further, the step S102 further includes: according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point; determining a second phase point according to the first phase point; and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
Specifically, the reverse current phenomenon of the current occurs near the zero crossing point of the alternating voltage, and the voltage phase angle interval for transmitting the reverse current is symmetrical based on the zero point of the transition from the positive half period to the negative half period in the input voltage, so the determined start voltage phase angle for generating the reverse current is used as the first phase point δ, and then the second phase point 2 pi- δ which is the end voltage phase angle of the reverse current can be obtained through calculation, thereby determining the phase interval of the reverse current voltage control condition.
The determining the second phase point according to the first phase point may be: determining a voltage phase value of a second phase point according to the voltage phase value corresponding to the first phase point; in an embodiment, in one period, when the voltage phase value corresponding to the first phase point is determined to be δ and δ is less than or equal to pi, the voltage phase value corresponding to the second phase point is determined to be 2 pi- δ. And the phase interval of the countercurrent voltage phase control condition in the input current is (delta, 2 pi-delta).
In another embodiment, in one period, it is determined that the voltage phase value corresponding to the first phase point is δ, and δ is greater than pi, and then the voltage phase value corresponding to the second phase point is 2 pi- δ. And the phase interval of the countercurrent voltage phase control condition in the input current is (delta, 2 pi) U (0, 2 pi-delta).
Specifically, determining the input voltage of alternating current input by an inductor in a loop, and entering voltage phase sampling preparation after the input voltage exceeds a peak value; here, the peak value is a maximum value of the input voltage. In the voltage phase sampling process, when the current value of the input current meets a first preset condition, the voltage phase value of the input voltage corresponding to the current value of the input current meeting the first preset condition can be calculated by obtaining the instantaneous voltage value of the alternating current and according to the maximum value of the alternating current input voltage and the instantaneous voltage value. The voltage phase value is determined as a first phase point in a phase interval of a reverse current voltage phase control condition. Determining a voltage phase value corresponding to the second phase point according to the voltage phase value corresponding to the first phase point; and determining the phase interval of the countercurrent voltage phase control condition in the input current according to the sizes of the first phase point and the second phase point.
Further, the current value of the input current satisfies a first preset condition, including: the current value of the input current is negative and/or the current value of the input current is equal to zero.
Specifically, the first phase point may be a voltage phase value of the input voltage corresponding to a current value of the input current being zero, and/or a voltage phase value of the input voltage corresponding to a current value of the input current being negative.
Further, the current value of the input current satisfies a first preset condition, and the method further includes: the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value; and/or the minimum current value of the inductor current in one switching period is less than zero; wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
Specifically, the first phase point may also be a difference between a maximum current value and a minimum current value of the inductor current in one switching period, and a voltage phase of the corresponding input voltage when a difference between a current value of the input current corresponding to a middle time of the switching period is smaller than a preset value; and/or, the first phase point may also be a voltage phase of the input voltage corresponding to a time when the minimum current value of the inductor current in one switching period is less than zero.
Specifically, the switching period may be a period of the pulse signal received by any one of the switching tubes, based on the switching tube assuming an on or off state according to the high or low level in the received pulse signal; here, the switching period may be one period or a plurality of periods;
and the current value at the middle moment of the switching period is the current value of the alternating current input by the inductor corresponding to the middle point of the conduction period of the switching tube in the period. The preset value can be a preset default value or an empirical value.
The difference between the maximum current value and the minimum current value of the inductive current and the current value of the input current corresponding to the middle moment of the switching cycle, which is smaller than the preset value, may be: i (Imax-Imin) -Ism||<Iset；
Wherein the inductor current is related to at least an output voltage, an input voltage, and an input current; the inductance value of the inductor is represented as L, the input voltage of the alternating current obtained through measurement is represented as Uac, the output voltage of the alternating current obtained through measurement is represented as Udc, the pulse period is T, T is Ton + Toff, the period of the first switching tube in the switching period is Ton, the period of the first switching tube in the switching period is Toff, and Ton is Toff;
the maximum current value of the inductor current is denoted as Imax:
the minimum current value of the inductor current is denoted as Imin:
the current value at the middle moment of the switching period is represented as IsmThe preset current threshold, i.e., the preset value, is expressed as Iset.
Specifically, in one embodiment, a first switch tube is taken as an example; when the switching period is one period and the conduction time of the first switching tube in the switching period is 0-Ton, the middle moment of the switching period is Ton/2; the current value at the middle moment of the switching period is the current value of the input current corresponding to the Ton/2 moment; the preset value is denoted Iset, where the preset value is a certain current value that is greater than the current value at the middle instant of the switching cycle. Measuring input current, input voltage and output voltage at each moment in the switching period, wherein the difference between the maximum current value Imax and the minimum current value Imin in the measured inductive current is equal to twice the current value I at the middle moment of the switching periodsmWhen it is, i.e., Imax-Imin ═ 2 × Ism(ii) a Then | (Imax-Imin) -Ism||＝Ism<Iset, the voltage phase of the input voltage corresponding to the input current at this time is set as the first phase point.
In another embodiment, take the first switch tube as an example; when the switching period is one period and the conduction time of the first switching tube in the switching period is 0-Ton, the middle moment of the switching period is Ton/2; the current value at the middle moment of the switching period is the current value of the input current corresponding to the Ton/2 moment; and measuring the input current, the input voltage and the output voltage at each moment in the switching period, and setting the voltage of the input voltage corresponding to the input current at the moment as a first phase point when the minimum current value Imin in of the measured inductive current is less than zero, namely Ism < 0.
Further, in step S104, the controlling the rectifier circuit to be in the second rectification state in the phase interval includes: determining the input voltage of the alternating current input by the inductor in the phase interval; and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
Further, when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, the first switching tube is in an off state; and/or controlling the second switching tube to be in an off state when the input voltage is in a negative half period and less than or equal to a second voltage threshold.
Specifically, as shown in fig. 2, fig. 2 is a schematic diagram of a second rectification state provided in the present application. The positive half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a positive value in the phase interval of the countercurrent voltage phase control condition; the negative half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a negative value in the phase interval of the countercurrent voltage phase control condition; the negative half-cycle and the positive half-cycle are symmetrical based on a zero point.
The first voltage threshold and the second voltage threshold may be preset default values or experience values, or may be set manually;
specifically, in this embodiment, the second preset condition that the input voltage satisfies may be: in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a first voltage threshold value; and/or in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a negative value and is less than or equal to a second voltage threshold value.
In the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a first voltage threshold value, the control loop outputs a control signal for controlling the first switching tube to be in a disconnected state, and controls the pulse signal on the first switching tube to be in a low level state, and at the moment, the period of the pulse signal on the first switching tube is increased compared with the period in the first rectification state; and/or in the phase interval of the reverse current voltage phase control condition, when the voltage value of the input voltage is a negative value and is less than or equal to a second voltage threshold value according to the voltage value of the input voltage, the control loop outputs a control signal for controlling the second switching tube to be in a disconnected state, namely, the pulse signal on the second switching tube is controlled to be in a low level state, and at the moment, the period of the pulse signal on the second switching tube is increased compared with the period in the first rectification state.
Further, when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, the switching states of the first switching tube and the second switching tube are controlled to be opposite; and/or when the input voltage is in a negative half period and less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite; wherein the on state and the off state are opposite switching states.
Specifically, as shown in fig. 3, fig. 3 is a schematic diagram of another second rectification state provided in the present application. The positive half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a positive value in the phase interval of the countercurrent voltage phase control condition; the negative half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a negative value in the phase interval of the countercurrent voltage phase control condition; the negative half-cycle and the positive half-cycle are symmetrical based on a zero point.
The third voltage threshold and the fourth voltage threshold may be preset default values or experience values, or may be set manually;
specifically, in this embodiment, the second preset condition that the input voltage satisfies may be: in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a third voltage threshold value; and/or in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a negative value and is less than or equal to a fourth voltage threshold value.
In the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a third voltage threshold value, the control loop outputs and controls the duration of high level of a pulse signal in the second switching tube to be increased, and simultaneously outputs and controls a control signal which controls the switching states of the first switching tube and the second switching tube to be opposite, namely when the second switching tube is a high level pulse signal, the first switching tube is a low level pulse signal; when the second switch tube is a low-level pulse signal, the first switch tube is a high-level pulse signal; at this time, the periods of the pulse signals on the first switch tube and the second switch tube are both increased compared with the period in the first rectification state.
And/or in the phase interval of the reverse current voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a negative value and is less than or equal to a fourth voltage threshold, the control loop outputs a control signal for controlling the high level duration of the pulse signal in the first switch tube to be increased and outputs a control signal for controlling the switch states of the first switch tube and the second switch tube to be opposite, namely when the high level pulse signal is in the first switch tube, the low level pulse signal is in the second switch tube; when the first switch tube is a low-level pulse signal, the second switch tube is a high-level pulse signal; at this time, the periods of the pulse signals on the first switch tube and the second switch tube are both increased compared with the period in the first rectification state.
In this embodiment, by increasing the pulse signal period of the first switch tube and the second switch tube, the on-time of the first switch tube or the second switch tube is increased in the phase interval of the reverse current voltage phase control condition, so as to increase the input current of the inductor, achieve the effect of increasing the energy stored in the inductor, increase the time for releasing the stored energy of the inductor under the condition of discontinuous and small current, and control the Totem Pole PFC loop not to generate reverse current.
Further, when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, the third switching tube is controlled to be in an off state; and/or when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
Specifically, as shown in fig. 4, fig. 4 is a schematic diagram of another second rectification state provided in the present application. The positive half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a positive value in the phase interval of the countercurrent voltage phase control condition; the negative half cycle is an input voltage interval in which the voltage value of the input sinusoidal alternating current is a negative value in the phase interval of the countercurrent voltage phase control condition; the negative half-cycle and the positive half-cycle are symmetrical based on a zero point.
The fifth voltage threshold and the sixth voltage threshold may be preset default values or experience values, or may be set manually;
specifically, in this embodiment, the second preset condition that the input voltage satisfies may be: in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a fifth voltage threshold value; and/or in the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a negative value and is less than or equal to a sixth voltage threshold value.
In the phase interval of the countercurrent voltage phase control condition, according to the voltage value of the input voltage, when the voltage value of the input voltage is a positive value and is greater than or equal to a fifth voltage threshold value, the control loop outputs a control signal for controlling the third switching tube to be in an off state, namely, the pulse signal on the third switching tube is controlled to be in a low level state, and at the moment, the period of the pulse signal on the third switching tube is increased compared with the period in the first rectification state; and/or in the phase interval of the countercurrent voltage phase control condition, when the voltage value of the input voltage is a negative value and is less than or equal to a sixth voltage threshold value according to the voltage value of the input voltage, the control loop outputs a control signal for controlling the fourth switching tube to be in a disconnected state, namely, the pulse signal on the fourth switching tube is controlled to be in a low level state, and at the moment, the period of the pulse signal on the fourth switching tube is increased compared with the period in the first rectification state.
It should be noted that, here, the first voltage threshold, the third voltage threshold, and the fifth voltage threshold are positive values, and the first voltage threshold, the third voltage threshold, and the fifth voltage threshold may be equal or unequal; the second voltage threshold, the fourth voltage threshold and the sixth voltage threshold are negative values, and the second voltage threshold, the fourth voltage threshold and the sixth voltage threshold may be equal or unequal; and is not particularly limited herein.
Further, in the phase interval, the first switch tube and the second switch tube are controlled to be in an off state.
Specifically, as shown in fig. 5, fig. 5 is a schematic diagram of another second rectification state provided in the present application. In this embodiment, the second preset condition that the input voltage satisfies may be: the voltage of the input voltage is in a phase interval of the reverse current voltage phase control condition.
Specifically, when the voltage phase of the input voltage is in the phase interval of the reverse current voltage phase control condition, the control circuit outputs a control signal for controlling the first switching tube and the second switching tube to be in the off state, that is, the pulse signals on the first switching tube and the second switching tube are controlled to be in the low level state, and at this time, the periods of the pulse signals on the first switching tube and the second switching tube are increased compared with the period in the first rectification state.
In the embodiment, the input voltage of the alternating current input by the inductor is determined in a phase interval of a countercurrent voltage phase control condition where current countercurrent is likely to occur; when the input voltage meets different preset conditions, the control loop controls pulse signals output to the first switching tube, the second switching tube, the third switching tube and the fourth switching tube so as to correspondingly control the periodic state of the switch input pulse signals of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit by determining that the input voltage meets different preset conditions in a phase interval of sending current countercurrent, thereby realizing the control of the open state and the closed state of each switching tube; so that the current in the Totem Pole type PFC loop always remains flowing in the forward direction. By controlling the state of a switching tube in the rectifier circuit, under the condition of not changing the number of turns of an inductance coil, even though the current passing through the inductance in the loop is discontinuous and small, the current in the loop can not generate reverse flow, and the efficiency is improved; meanwhile, the increase of copper loss is reduced, the increase of the size of an inductor in a loop is avoided, and the cost is reduced.
As shown in fig. 7, a schematic structural diagram of a current control device according to an embodiment of the present invention is shown, where the current control device is applied to a circuit including: in inductance and the rectifier circuit who is connected with inductance, include: a first determination module 701, a second determination module 702, a first control module 703 and a second control module 704. Wherein the content of the first and second substances,
the first determining module 701 determines a current value of alternating current input by the inductor;
the second determining module 702 is configured to determine a phase interval of a reverse current voltage phase control condition in the input current according to a current value of the input current;
the first control module 703 is configured to control the rectifier circuit to be in a first rectification state outside the phase interval; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
the second control module 704 is configured to control the rectifier circuit to be in a second rectification state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
Specifically, the second determining module 702 is specifically configured to determine, according to a current value of an input current, when the current value of the input current meets a first preset condition, an input voltage phase corresponding to the input current as a first phase point; determining a second phase point according to the first phase point; and determining the phase interval of the countercurrent voltage phase control condition in the input current according to the first phase and the second phase.
Specifically, the second determining module 702 is specifically configured to: determining that a current value of the input current satisfies a first preset condition, including: the current value of the input current is negative and/or the current value of the input current is equal to zero.
Specifically, the second determining module 702 is specifically configured to: determining that the current value of the input current meets a first preset condition, further comprising: the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value; and/or the minimum current value of the inductor current in one switching period is less than zero; wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
Specifically, the second control module 704 is specifically configured to: determining the input voltage of the alternating current input by the inductor in the phase interval; and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
Specifically, the second control module 704 is specifically configured to: when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state; and/or controlling the second switching tube to be in an off state when the input voltage is in a negative half period and less than or equal to a second voltage threshold.
Specifically, the second control module 704 is further configured to: when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite; and/or when the input voltage is in a negative half period and less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite; wherein the on state and the off state are opposite switching states.
Specifically, the second control module 704 is specifically configured to: when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state; and/or when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
Specifically, the second control module 704 is specifically configured to: and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
Specifically, the current control device further includes: the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube; the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube; the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
To implement the method of the embodiment of the present invention, the current control apparatus provided by the embodiment of the present invention, specifically, as shown in fig. 8, the apparatus 80 includes a processor 801 and a memory 802 for storing a computer program capable of running on the processor;
wherein, the processor 801 is configured to execute, when running the computer program, the following steps: determining the current value of alternating current input by the inductor; determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current; outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed; controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point; determining a second phase point according to the first phase point; and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: determining that a current value of the input current satisfies a first preset condition, including: the current value of the input current is negative and/or the current value of the input current is equal to zero.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: determining that the current value of the input current meets a first preset condition, further comprising: the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value; and/or the minimum current value of the inductor current in one switching period is less than zero; wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: determining the input voltage of the alternating current input by the inductor in the phase interval; and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state; and/or controlling the second switching tube to be in an off state when the input voltage is in a negative half period and less than or equal to a second voltage threshold.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite; and/or when the input voltage is in a negative half period and less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite; wherein the on state and the off state are opposite switching states.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state; and/or when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
In an embodiment, the processor 801 is further configured to execute, when running the computer program, the following: the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube; the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube; the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
It should be noted that: the current control device and the current control method provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.
Of course, in practical applications, as shown in fig. 8, the apparatus 80 may further include: at least one network interface 803. The various components in current control device 80 are coupled together by a bus system 804. It is understood that the bus system 804 is used to enable communications among the components. The bus system 804 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 804 in FIG. 8. The number of the processors 801 may be at least one. The network interface 803 is used for communication between the current control device 80 and other devices in a wired or wireless manner.
The memory 802 in the embodiment of the present invention is used to store various types of data to support the operation of the current control device 80.
The methods disclosed in the embodiments of the present invention described above may be implemented in the processor 801 or implemented by the processor 801. The processor 801 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 801. The Processor 801 may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. Processor 801 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium that is located in the memory 802, and the processor 801 reads the information in the memory 802 to perform the steps of the aforementioned methods in conjunction with its hardware.
In an exemplary embodiment, the current control Device 80 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, Micro Controllers (MCUs), microprocessors (microprocessors), or other electronic components for performing the foregoing methods.
In an exemplary embodiment, the present invention further provides a computer readable storage medium, such as a memory 802 comprising a computer program, which is executable by the processor 801 of the current control apparatus 80 to perform the steps of the aforementioned method.
Specifically, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs: determining the current value of alternating current input by the inductor; determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current; outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed; controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
In one embodiment, the computer program, when executed by the processor, performs: according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point; determining a second phase point according to the first phase point; and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
In one embodiment, the computer program, when executed by the processor, performs: determining that a current value of the input current satisfies a first preset condition, including: the current value of the input current is negative and/or the current value of the input current is equal to zero.
In one embodiment, the computer program, when executed by the processor, performs: determining that the current value of the input current meets a first preset condition, further comprising: the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value; and/or the minimum current value of the inductor current in one switching period is less than zero; wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
In one embodiment, the computer program, when executed by the processor, performs: determining the input voltage of the alternating current input by the inductor in the phase interval; and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
In one embodiment, the computer program, when executed by the processor, performs: when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state; and/or controlling the second switching tube to be in an off state when the input voltage is in a negative half period and less than or equal to a second voltage threshold.
In one embodiment, the computer program, when executed by the processor, performs: when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite; and/or when the input voltage is in a negative half period and less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite; wherein the on state and the off state are opposite switching states.
In one embodiment, the computer program, when executed by the processor, performs: when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state; and/or when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
In one embodiment, the computer program, when executed by the processor, performs: and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
In one embodiment, the computer program, when executed by the processor, performs: the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube; the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube; the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
In the following, a current control method according to an embodiment of the present invention is described as a specific example:
step 1: determining a phase interval of a countercurrent voltage control condition;
the method comprises the following steps: after the input voltage of the alternating current input by the inductor is over-peak, voltage phase angle sampling preparation is carried out, when the current detection device detects negative current, the current phase angle of the input voltage is recorded to be delta, then the phase interval of the countercurrent voltage control condition is obtained by calculation to be (delta, 2 pi-delta), and the current control method is carried out.
The method 2 comprises the following steps: measuring an alternating current voltage Uac, a direct current bus voltage Udc and an inductance input current Ism at the switching time midpoint of a switching tube in a switching period in a conducting state, wherein the preset value is 3 Ism, calculating to obtain a difference value Imax-Imin of the inductance input current between the maximum value Imax and the minimum value Imin of the inductance input current in one or a plurality of switching periods, wherein 2 Ism is less than 3 Ism, taking the phase angle of the inductance input voltage at the moment as delta, and then calculating to obtain a phase interval (delta, 2 pi-delta) of a countercurrent voltage control condition, and entering a current control method.
Step 2: in the range of the phase section of the reverse current voltage control condition, entering a current control method, using special switching actions for switching tubes Q1, Q2, Q3 and Q4 to prevent the phenomenon of current reverse flow, and sharing a total control method of 4:
the method comprises the following steps: in a phase interval (delta, 2 pi-delta) of a reverse current voltage control condition, when the alternating current voltage input by the inductor is in a positive half cycle, the control loop controls the Q2 switching tube to keep a PWM signal unchanged, and the PWM signal of the Q1 tube is turned off; when the alternating voltage input by the inductor is in a negative half cycle, the control loop controls the Q1 switch tube to keep the PWM signal unchanged, and the PWM signal of the Q2 tube is switched off. The control loop control Q3, Q4 keeps the traditional control mode unchanged.
The method 2 comprises the following steps: in a phase interval (delta, 2 pi-delta) of a countercurrent voltage control condition, when alternating-current voltage input by an inductor is in a positive half cycle, a control loop controls a Q2 switching tube to increase conduction time and increase inductor current, so that the current cannot flow reversely after the Q1 switching tube is switched on; the driving signal of the Q1 switching tube is complementary with the driving signal of the Q2 switching tube, and no dead zone exists; when the alternating voltage input by the inductor is in a negative half cycle, the control loop controls the Q1 switch tube to increase the conduction time and increase the inductor current, so that the current cannot flow reversely after the Q2 switch tube is switched on, the driving signal of the Q2 switch tube is complementary with the driving signal of the Q1 switch tube, and no dead zone exists; the Q3 switch tube and the Q4 switch tube keep the traditional control mode unchanged.
The method 3 comprises the following steps: in a phase interval (delta, 2 pi-delta) of a reverse current voltage control condition, when the alternating current voltage input by the inductor is in a positive half cycle, the control loop turns off the PWM signal of the Q4 switching tube, and the control modes of the Q1 switching tube, the Q2 switching tube and the Q3 switching tube are consistent with the traditional method; when the alternating voltage input by the inductor is in a negative half cycle, the control loop turns off the PWM signal of the Q3 switching tube, and the control modes of the Q1 switching tube, the Q2 switching tube and the Q4 switching tube are consistent with the traditional method. After the anti-backflow control method is used, when the inductance is small, the current backflow situation does not occur, and the current waveform is shown in fig. 9.
The method 4 comprises the following steps: in a phase interval (delta, 2 pi-delta) of the reverse current voltage control condition, when the alternating current voltage input by the inductor is in a positive half cycle, the control loop turns off a Q1 switching tube, and a PWM signal of a Q2 switching tube; when the alternating voltage input by the inductor is in a negative half cycle, the control loop turns off the Q1 switching tube, and the PWM signals of the Q2 switching tube, Q3 and Q4 keep the traditional control mode unchanged.
The traditional current control method comprises the following steps: the Q3 switching tube is conducted when the alternating current voltage input by the inductor is in a negative half cycle and the input voltage is smaller than the eighth threshold voltage; the Q4 switching tube is conducted under the condition that the alternating current voltage input by the inductor is positive for a half cycle and the voltage is greater than the seventh threshold voltage; when the Q3 or Q4 is turned on, the Q1 switch tube and the Q2 switch tube perform high-frequency PWM output. In the conventional current control method, when the inductance is small, the current flows reversely, and the current waveform is as shown in fig. 9.
It should be noted that: the computer-readable storage medium provided by the embodiment of the invention can be memories such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface Memory, optical disk, or CD-ROM; or may be various devices including one or any combination of the above memories.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present invention are included in the protection scope of the present invention.
Claims (22)
1. A current control method is applied to a circuit comprising: in inductance and the rectifier circuit who is connected with inductance, the rectifier circuit includes:
determining the current value of alternating current input by the inductor;
determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current;
outside the phase interval, controlling the rectifying circuit to be in a first rectifying state; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
2. The method of claim 1, wherein determining the phase interval of the reverse current voltage phase control condition in the input current according to the current value of the input current comprises:
according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point;
determining a second phase point according to the first phase point;
and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
3. The method of claim 2, wherein the current value of the input current satisfies a first preset condition, comprising:
the current value of the input current is a negative value,
and/or the presence of a gas in the gas,
the current value of the input current is equal to zero.
4. The method of claim 3, wherein the current value of the input current satisfies a first preset condition, further comprising:
the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value;
and/or the presence of a gas in the gas,
the minimum current value of the inductive current in one switching period is less than zero;
wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
5. The method of claim 2, wherein said controlling said rectifier circuit to be in a second rectifier state during said phase interval comprises:
determining the input voltage of the alternating current input by the inductor in the phase interval;
and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
6. The method according to claim 5, wherein the controlling the rectifying circuit to be in the second rectifying state when the input voltage satisfies the second preset condition comprises:
when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and is less than or equal to a second voltage threshold value, controlling the second switching tube to be in an off state.
7. The method according to claim 5, wherein the controlling the rectifying circuit to be in a second rectifying state when the input voltage satisfies a second preset condition further comprises:
when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite;
and/or the presence of a gas in the gas,
when the input voltage is in a negative half period and is less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite;
wherein the on state and the off state are opposite switching states.
8. The method according to claim 5, wherein the controlling the rectifying circuit to be in a second rectifying state when the input voltage satisfies a second preset condition further comprises:
when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
9. The method of claim 2, wherein said controlling said rectifier circuit to be in a second rectifier state during said phase interval comprises:
and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
10. The method of claim 1, further comprising:
the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube;
the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube;
the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
11. A current control device, comprising: in an inductor and a rectifier circuit connected to the inductor, the apparatus comprising: the device comprises a first determination module, a second determination module, a first control module and a second control module; wherein the content of the first and second substances,
the first determining module is used for determining the current value of the alternating current input by the inductor;
the second determining module is used for determining a phase interval of a countercurrent voltage phase control condition in the input current according to the current value of the input current;
the first control module is used for controlling the rectifying circuit to be in a first rectifying state outside the phase interval; in the first rectification state, the pulse signal periods received by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in the rectification circuit are not changed;
the second control module is used for controlling the rectifying circuit to be in a second rectifying state in the phase interval; in the first rectification state and the second rectification state, the period of the pulse signal received by at least one of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the rectification circuit is changed compared with the period of the pulse signal received by the corresponding switching tube in the first rectification state.
12. The apparatus of claim 11, wherein the second determining module is specifically configured to:
according to the current value of the input current, when the current value of the input current meets a first preset condition, determining an input voltage phase corresponding to the input current as a first phase point;
determining a second phase point according to the first phase point;
and determining a phase interval of the countercurrent voltage phase control condition in the input current according to the first phase point and the second phase point.
13. The apparatus of claim 12, wherein the second determining module is further configured to determine that the current value of the input current satisfies a first preset condition, and includes:
the current value of the input current is a negative value,
and/or the presence of a gas in the gas,
the current value of the input current is equal to zero.
14. The apparatus of claim 13, wherein the second determining module is further configured to determine that the current value of the input current satisfies a first preset condition, and further comprising:
the difference value between the maximum current value and the minimum current value of the inductive current in one switching period and the current value of the input current corresponding to the middle moment of the switching period is smaller than a preset value;
and/or the presence of a gas in the gas,
the minimum current value of the inductive current in one switching period is less than zero;
wherein the inductor current is related to at least the output voltage, the input voltage, and the input current.
15. The apparatus of claim 12, wherein the second control module is specifically configured to:
determining the input voltage of the alternating current input by the inductor in the phase interval;
and controlling the rectifying circuit to be in a second rectifying state when the input voltage meets a second preset condition according to the input voltage.
16. The apparatus of claim 15, wherein the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a first voltage threshold value, controlling the first switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and is less than or equal to a second voltage threshold value, controlling the second switching tube to be in an off state.
17. The apparatus of claim 15, wherein the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a third voltage threshold value, controlling the switch states of the first switch tube and the second switch tube to be opposite;
and/or the presence of a gas in the gas,
when the input voltage is in a negative half period and is less than or equal to a fourth voltage threshold, controlling the switching states of the first switching tube and the second switching tube to be opposite;
wherein the on state and the off state are opposite switching states.
18. The apparatus of claim 15, wherein the second control module is further configured to:
when the input voltage is in a positive half period and is greater than or equal to a fifth voltage threshold value, controlling the third switching tube to be in an off state;
and/or the presence of a gas in the gas,
and when the input voltage is in a negative half period and less than or equal to a sixth voltage threshold value, controlling the fourth switching tube to be in an off state.
19. The apparatus of claim 12, wherein the second control module is further configured to:
and controlling the first switching tube and the second switching tube to be in an off state in the phase interval.
20. The apparatus of claim 11, further comprising:
the output end of the first switching tube is connected with the input end of the second switching tube, and the output end of the third switching tube is connected with the input end of the fourth switching tube;
the input end of the first switching tube is connected with the input end of the third switching tube, and the output end of the second switching tube is connected with the output end of the fourth switching tube;
the control ends of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the output end of the control loop; the control loop is respectively used for outputting control signals for controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a conducting state or a disconnecting state.
21. A current control device, the device comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to perform the steps of the method of any one of claims 1 to 10 when running the computer program.
22. A computer storage medium having stored thereon computer-executable instructions; the computer-executable instructions, when executed by a processor, are capable of implementing a data transmission method as claimed in any one of claims 1 to 10.
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