CN113765409A - Control method and power regulation method for direct alternating current-alternating current conversion circuit - Google Patents
Control method and power regulation method for direct alternating current-alternating current conversion circuit Download PDFInfo
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
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Abstract
The application relates to a control method and a power regulation method of a direct alternating current-alternating current conversion circuit, the control method is applied to the direct alternating current-alternating current conversion circuit, the input alternating current voltage signal is received, the direct alternating current-alternating current conversion circuit is controlled to work in a working mode according to the input alternating current voltage signal, then switching state information is obtained, a target half-bridge unit and the duration of the working state of the target half-bridge unit are determined according to the switching state information, the duration of the working state of the target half-bridge unit is finally controlled to be maintained, in the process that the conversion circuit is switched from one working mode to another working mode, a load connected with the conversion circuit is provided with a follow current channel, and therefore, voltage spikes can be eliminated only by continuing the working state of at least one of a first half-bridge unit and a second half-bridge unit in the conversion circuit for a period of time, and no extra element is needed to be added in the direct alternating current-alternating current conversion circuit, so that the element cost is reduced, and the direct alternating current-alternating current conversion circuit is easy to realize.
Description
Technical Field
The present application relates to the field of control technologies, and in particular, to a control method and a power adjustment method for a direct ac-ac conversion circuit.
Background
The Direct AC-AC Converter (DAAC) has the advantages of high specific efficiency, simple topology, small stress of devices and the like.
The specific structure of the direct ac-ac conversion circuit is shown in fig. 1. When the direct alternating current-alternating current conversion circuit is switched in a working mode, if the time sequence of a phase change process is not noticed, voltage spikes can be caused. Taking the positive half-cycle operating mode to switch to the dead-zone operating mode as an example, when the operating mode is switched, the first switch Q1 and the first switch Q3 need to be opened, and the fourth switch Q4 needs to be closed, and actually, these switching actions cannot be guaranteed to be completed at the same time, and if an unreasonable switching sequence occurs, a voltage spike may be caused, thereby causing the risk of overvoltage damage to the device. In contrast, conventionally, an absorption capacitor is connected in parallel to each of the two half-bridges, as shown in fig. 2, so as to ensure that no voltage spike is generated when the direct ac-ac conversion circuit is switched between any operating modes.
However, the parallel connection of capacitors increases the cost of components, and in some high-power applications, in order to meet the heat dissipation requirement, the DAAC circuit module is required to be assembled on an SMT aluminum substrate, and the additional absorption capacitors C1 and C2 cannot be implemented with the plug-in film capacitors, so that the ceramic capacitors have failure risks due to mechanical stress, and the solution of adding absorption capacitors becomes more difficult.
Disclosure of Invention
In view of the above, it is necessary to provide a low-cost control method, apparatus, device, system, power regulation method and storage medium to solve the problem of voltage spike in the direct ac-ac conversion circuit.
A control method of a direct alternating current-alternating current conversion circuit is characterized in that the direct alternating current-alternating current conversion circuit comprises a first half-bridge unit and a second half-bridge unit which are connected with each other, the first half-bridge unit comprises a first diode, a second diode, a first switch and a second switch, and the second half-bridge unit comprises a third diode, a fourth diode, a third switch and a fourth switch; the on-off states of the first switch and the second switch are used for representing the working state of the first half-bridge unit, and the on-off states of the third switch and the fourth switch are used for representing the working state of the second half-bridge unit, and the control method comprises the following steps:
receiving an input alternating voltage signal, and controlling the direct alternating current-alternating current conversion circuit to work in a working mode according to the input alternating voltage signal;
acquiring switching state information of the direct alternating current-alternating current conversion circuit from one working mode to another working mode;
determining the duration of the target half-bridge unit and the working state thereof according to the switching state information; the target half-bridge cell is at least one of the first half-bridge cell and the second half-bridge cell;
and controlling the target half-bridge unit to maintain the working state for the duration so as to control the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, wherein a load connected with the direct alternating current-alternating current conversion circuit has a free-wheeling path.
In one embodiment, the determining the duration of the target half-bridge unit and the operating state thereof according to the switching state information comprises:
and if the switching state information is that the positive half-cycle working mode is switched to the dead-zone working mode, taking the first half-bridge unit as the target half-bridge unit, and taking a first preset time length as the duration time length of the working state of the first half-bridge unit.
In one of the embodiments, the first and second electrodes are,
the first preset time is longer than or equal to a first dead time, and the first dead time is a delay time of the second half-bridge unit in a complementary conduction state in the process of complementary switching of the third switch and the fourth switch.
In one embodiment, the determining the duration of the target half-bridge unit and the operating state thereof according to the switching state information comprises:
and if the switching state information comprises a mode switched from a negative half-cycle working mode to a dead-zone working mode, taking the second half-bridge unit as the target half-bridge unit, and taking a second preset time length as the duration time length of the working state of the second half-bridge unit.
In one embodiment, the second preset time period is greater than or equal to a second dead time period, where the second dead time period is a delay time period of the first half bridge unit in the complementary conducting state during the complementary switching process of the first switch and the second switch.
In one embodiment, the determining the duration of the target half-bridge unit and the operating state thereof according to the switching state information comprises:
and if the switching state information is switched from a dead zone working mode to a negative half-cycle working mode, taking the first half-bridge unit as the target half-bridge unit, and taking a third preset time length as the duration time length of the working state of the first half-bridge unit.
In one embodiment, the third preset time period is greater than or equal to the second dead time period.
In one embodiment, the determining the duration of the target half-bridge unit and the operating state thereof according to the switching state information comprises:
and if the switching state information is switched from a dead-zone working mode to a positive half-cycle working mode, taking the second half-bridge unit as the target half-bridge unit, and taking a fourth preset time length as the duration time length of the working state of the second half-bridge unit.
In one embodiment, the fourth preset time period is greater than or equal to the first dead time period.
A direct ac-ac converter comprising:
the direct alternating current-alternating current conversion circuit comprises a first half-bridge unit and a second half-bridge unit which are connected with each other, wherein the first half-bridge unit comprises a first diode, a second diode, a first switch and a second switch, and the second half-bridge unit comprises a third diode, a fourth diode, a third switch and a fourth switch; the on-off states of the first switch and the second switch are used for representing the working state of the first half-bridge unit, and the on-off states of the third switch and the fourth switch are used for representing the working state of the second half-bridge unit; and
a control module for controlling the operation of the at least one processor,
receiving an input alternating voltage signal, and controlling the direct alternating current-alternating current conversion circuit to work in a working mode according to the input alternating voltage signal;
acquiring switching state information of the direct alternating current-alternating current conversion circuit from one working mode to another working mode;
determining the duration of the target half-bridge unit and the working state thereof according to the switching state information; the target half-bridge cell is at least one of the first half-bridge cell and the second half-bridge cell;
and controlling the target half-bridge unit to maintain the working state for the duration so as to control the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, wherein a load connected with the direct alternating current-alternating current conversion circuit has a free-wheeling path.
An induction heating apparatus comprising a direct ac-ac converter as described in the previous embodiments and a load, wherein the load is an inductive load.
A power regulation method for use with an induction heating apparatus, the method comprising:
acquiring target power of a load;
respectively adjusting the switching frequency of the first switch and the second switch in a negative half-cycle working mode according to the target power; and/or
And respectively adjusting the switching frequency of the third switch and the fourth switch in a positive half-cycle working mode according to the target power so that the power value of the load reaches the target power after the load receives the output signal of the direct alternating current-alternating current conversion circuit.
In one embodiment, the direct ac-to-ac conversion circuit performs a positive half cycle operation mode, a dead band operation mode, and a negative half cycle operation mode during a duty cycle, and the power regulation method further includes:
and adjusting the number of working cycles of the direct alternating current-alternating current conversion circuit according to the target power.
In one embodiment, the method further comprises:
controlling the on-off duration of the first switch and the second switch to be the same under the negative half-cycle working mode; and/or
And controlling the on-off duration of the third switch and the fourth switch to be the same in the positive half-cycle working mode.
A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the control method of any of the above embodiments.
The control method of the direct alternating current-alternating current conversion circuit is applied to the direct alternating current-alternating current conversion circuit, the input alternating current voltage signal is received, the direct alternating current-alternating current conversion circuit is controlled to work in one working mode according to the input alternating current voltage signal, then switching state information of the direct alternating current-alternating current conversion circuit switched from one working mode to another working mode is obtained, the duration of a target half-bridge unit and the working state of the target half-bridge unit is determined according to the switching state information, the duration of the working state of the target half-bridge unit is finally controlled to be maintained, in the process of controlling the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, a load connected with the direct alternating current-alternating current conversion circuit is provided with a follow current passage, and therefore, the voltage spike can be eliminated only by continuing the duration of the working state of at least one of a first half-bridge unit and a second half-bridge unit in the conversion circuit The peak is not needed to add extra elements in the direct alternating current-alternating current conversion circuit, so that the element cost is reduced, and the direct alternating current-alternating current conversion circuit is easy to realize.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a DAAC of the prior art;
FIG. 2 is a schematic diagram of a prior art DAAC circuit configuration with parallel absorption capacitors;
fig. 3 is a waveform diagram of a voltage Vac of an input ac voltage signal and an output voltage Vo of the direct ac-ac converting circuit;
FIG. 4 is a schematic diagram of the DAAC circuit in the positive half cycle mode of operation in one embodiment;
FIG. 5 is a schematic diagram of the DAAC circuit configuration in the dead band operating mode in one embodiment;
FIG. 6 is a schematic diagram of the DAAC circuit in the negative half cycle mode of operation in one embodiment;
FIG. 7 is a flow diagram illustrating a DAAC control method in one embodiment;
FIG. 8 is a schematic diagram of the control timing of the DAAC in one embodiment;
FIG. 9 is a schematic diagram of the circuit configuration of an embodiment of the DAAC when switching from the positive half-cycle mode of operation to the deadband mode of operation;
FIG. 10 is a schematic diagram of the circuit configuration for switching the DAAC from the negative half-cycle mode of operation to the dead band mode of operation in one embodiment;
FIG. 11 is a schematic structural diagram of a control apparatus in one embodiment;
FIG. 12 shows the output voltage Vo and the load current I according to one embodimentLCompared to the waveform between the voltage Vac.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As shown in fig. 1, the DAAC includes a first half-bridge unit and a second half-bridge unit connected to each other, the first half-bridge unit including a first diode D1, a second diode D2, a first switch Q1 connected in parallel with the first diode D1, and a second switch Q2 connected in parallel with the second diode D2, the second half-bridge unit including a third diode D3, a fourth diode D4, a third switch Q3 connected in parallel with the third diode D3, and a fourth switch Q4 connected in parallel with the fourth diode D4, each switch being turned on to provide a conductive path between a cathode and an anode of each diode. The first half-bridge unit and the second half-bridge unit are respectively connected to two ends of a power supply, the power supply is connected with an input capacitor Cin in parallel, wherein the cathode of a first diode D1 is respectively connected with the a end of the power supply and the first end of the input capacitor Cin, the anode of a first diode D1 is respectively connected with the cathode of a second diode D2 and the p end of a load Zo, the cathode of a third diode D3 is respectively connected with the b end of the power supply and the second end of the input capacitor Cin, the anode of a third diode D3 is respectively connected with the cathode of a fourth diode D4 and the q end of the load Zo, and the anode of a second diode D2 is connected with the anode of a fourth diode D4. DAAC is divided into three modes of operation, namely a positive half-cycle mode of operation, a negative half-cycle mode of operation, and a deadband mode of operation. Referring to fig. 3, the positive half-cycle operation mode, i.e., the direct ac-ac conversion circuit, operates in the positive half-cycle operation region, the negative half-cycle operation mode, i.e., the direct ac-ac conversion circuit, operates in the negative half-cycle operation region, and the dead-zone operation mode, i.e., the direct ac-ac conversion circuit, operates in the dead zone. Wherein, the definition of the working area can be generated by comparing the voltage of the input alternating voltage signal with two threshold voltages, and the working time period of which the voltage Vac is higher than the threshold Vth1 is defined as the positive half-cycle working area; an operating period in which the voltage Vac is lower than the threshold Vth1 and higher than the threshold Vth2 is defined as a dead zone; the operation region in which the voltage Vac is lower than the threshold Vth2 is defined as a negative half cycle operation region. When the DAAC operates in the positive half-cycle operation mode, the first half-bridge unit is in a through state, the two switches (the first switch Q1 and the second switch Q2) of the first half-bridge unit are simultaneously turned on, at this time, the power supply is applied to the second bridge arm in a forward direction (the end a is high potential, and the end b is low potential), the two switches (the third switch Q3 and the fourth switch Q4) of the second half-bridge unit operate at a set duty ratio, as shown in fig. 4, at this time, the output signal Vo of the direct ac-ac conversion circuit is applied to the load in a forward direction (the end p is high potential, and the end Q is low potential), the voltage waveform envelope of the output signal Vo is the same as the waveform of the voltage Vac, and the average value is proportional to the duty ratio; when the DAAC operates in the dead-band operation mode, the first switch Q1 and the third switch Q3 are turned off, and the second switch Q2 and the fourth switch Q4 are turned on, as shown in fig. 5; when the DAAC operates in the negative half-cycle operation mode, the two switches (the third switch Q3 and the fourth switch Q4) of the second half-bridge unit are turned on simultaneously, at this time, the negative direction (the end a is low potential, the end b is high potential) of the ac power is applied to the first arm, the first half-bridge (the first switch Q1 and the second switch Q2) operates at the set duty ratio, as shown in fig. 6, at this time, the output signal Vo of the direct ac-ac conversion circuit is applied to the load in the negative direction (the end p is low potential, and the end Q is high potential), the voltage waveform envelope of the output signal Vo is the same as the waveform of the voltage Vac, and the average value is proportional to the duty ratio.
As described in the background art, the direct ac-ac conversion circuit in the prior art generates a voltage spike when switching the operation mode, and the inventor has found that the problem is caused by that when switching the operation mode, because the switching sequence is not reasonable, the load connected to the direct ac-ac conversion circuit has no freewheeling path, and finally a voltage spike is caused.
For the above reasons, the present invention provides a control method applied to the direct ac-ac conversion circuit shown in fig. 1. As shown in fig. 7, the control method includes steps S110 to S140.
Step S110, receiving the input ac voltage signal, and controlling the direct ac-ac converting circuit to operate in a working mode according to the input ac voltage signal.
The input ac voltage signal is a signal provided by the power supply to the direct ac-ac conversion circuit, and a waveform diagram of the voltage Vac of the input ac voltage signal can be shown in fig. 3. The direct alternating current-alternating current conversion circuit can patrol the positive half-cycle working mode, the dead-zone working mode and the negative half-cycle working mode in one working cycle.
Step S120, obtaining the switching status information of the direct ac-ac conversion circuit from one of the operating modes to another operating mode.
The switching state information can be switched from the positive half-cycle working mode to the dead zone working mode, or from the dead zone working mode to the negative half-cycle working mode, or from the negative half-cycle working mode to the dead zone working mode, or from the dead zone working mode to the positive half-cycle working mode. It can be understood that, as is clear from the waveform of the voltage Vac, the order in which the direct ac-ac conversion circuit transits the respective operation modes is fixed, that is, the positive half cycle operation mode, the dead band operation mode, the negative half cycle operation mode, and the dead band operation mode are cycled in this order, and therefore the switching state information is one of the four types.
In one embodiment, obtaining the switching state information may include obtaining the switching state information from an input ac voltage signal. For example: if the voltage Vac of the input ac voltage signal is higher than the threshold Vth1, it can be determined that the direct ac-ac conversion circuit is in the positive half-cycle operation mode at this time, and the switching state information is the switching from the positive half-cycle operation mode to the dead-zone operation mode; if the voltage Vac is lower than the threshold Vth1 and higher than the threshold Vth2, and the voltage Vac is a decay trend, it can be determined that the direct ac-ac conversion circuit is in the dead-band operation mode at this time, and the switching state information is switched from the dead-band operation mode to the negative half-cycle operation mode; if the voltage Vac is lower than the threshold Vth2, it can be determined that the direct ac-ac conversion circuit is in the negative half-cycle operation mode at this time, and the switching state information is the switching from the negative half-cycle operation mode to the dead-zone operation mode; if the voltage Vac is lower than the threshold Vth1 and higher than the threshold Vth2, and the voltage Vac is increasing, it can be determined that the direct ac-ac conversion circuit is in the dead-band operation mode at this time, and the switching state information is the switching from the dead-band operation mode to the positive half-cycle operation mode.
In one embodiment, the switching status information may also be obtained according to the power frequency zero-crossing detection synchronization signals Sync1 and Sync2, as shown in fig. 8, Sync1 and Sync2 are respectively used to indicate the switching between the positive half-cycle operating mode and the dead-zone operating mode and the switching between the negative half-cycle operating mode and the dead-zone operating mode, for example, when the Sync1 changes from high level to low level (at time t 1), it may be determined that the positive half-cycle operating mode is switched to the dead-zone operating mode at this time; when Sync2 changes from low to high (at time t 3), it can be determined that the dead-band operation mode is switched to the negative half-cycle operation mode at this time. Therefore, the switching state information of the direct ac-ac conversion circuit can be acquired according to the Sync1 and the Sync 2.
Step S130, determining the duration of the target half-bridge unit and the working state thereof according to the switching state information; the target half-bridge cell is at least one of the first half-bridge cell and the second half-bridge cell.
The switching state information corresponds to the target half-bridge unit and the duration of the working state of the target half-bridge unit one by one, and the duration of the working states of the target half-bridge unit and the target half-bridge unit can be determined according to the switching state information.
Step S140, controlling the target half-bridge unit to maintain the operating state for a duration so as to control a load connected to the direct ac-ac conversion circuit to have a freewheeling path during the process of switching the direct ac-ac conversion circuit from one operating mode to another operating mode.
Wherein the on-off states of the first switch and the second switch are used for representing the working state of the half-bridge unit. The operating states of the first half-bridge unit and the second half-bridge unit respectively comprise a complementary conducting state, a dead-zone state and a through state. In a complementary conduction state, the first switch and the second switch are complementarily switched, and the switching time is delayed by preset dead zone duration; in the dead zone state, the first switch is switched off, and the second switch is switched on; in the through state, both the first switch and the second switch are turned on. When the direct alternating current-alternating current conversion circuit works in a positive half-cycle working mode, the first half-bridge unit is in a direct-connection state, and the second half-bridge unit is in a complementary connection state; in the dead-zone working mode, the first half-bridge unit and the second half-bridge unit are in a dead-zone state; under the negative half-cycle working mode, the first half-bridge unit is in a complementary conduction state, and the second half-bridge unit is in a through state. Therefore, the control of the operation mode of the direct ac-ac conversion circuit can be reflected as the control of the operation states of the two half-bridge units.
It can be understood that when the duration is determined, the target half-bridge unit maintains the operating state in the current operating mode for a certain duration when the direct ac-ac converting circuit is controlled to switch from the current operating mode to the next operating mode, so that during the switching of the direct ac-ac converting circuit, the target half-bridge unit still maintains the operating state in the operating mode before switching for the duration, so that the load connected to the direct ac-ac converting circuit has a freewheeling path, and finally the generation of voltage spikes is avoided.
The control method of the embodiment of the invention only extends the working state of at least one of the first half-bridge unit and the second half-bridge unit in the direct alternating current-alternating current conversion circuit for a period of time, so that in the process of controlling the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, at least one half-bridge unit still maintains the working state in the working mode before switching for the extended period of time, and a load connected with the direct alternating current-alternating current conversion circuit has a follow current path, thereby eliminating voltage spikes, reducing the component cost compared with a mode of adding additional components in the direct alternating current-alternating current conversion circuit, and being easy to implement.
In one embodiment, the step of determining the target half-bridge unit and the delay information of the operating state of the target half-bridge unit according to the switching state information includes: if the switching state information is that the positive half-cycle working mode is switched to the dead-zone working mode, the first half-bridge unit is used as a target half-bridge unit, and a first preset duration is used as a duration of the working state of the first half-bridge unit.
In one embodiment, the first preset time period is greater than or equal to a first dead time period, and the first dead time period is a delay time period of the complementary switching process of the third switch and the fourth switch when the first half-bridge unit and the second half-bridge unit are in the complementary conducting state.
In one embodiment, determining the target half-bridge cell and the duration of the operating state of the target half-bridge cell according to the switching state information comprises: and if the switching state information comprises the switching from the negative half-cycle working mode to the dead-zone working mode, taking the second half-bridge unit as a target half-bridge unit, and taking a second preset time length as the duration time length of the working state of the second half-bridge unit. In one embodiment, the second preset time period is greater than or equal to a second dead time period, and the second dead time period is a delay time period of the first half bridge unit in the complementary conducting state during the complementary switching process of the first switch and the second switch.
In one embodiment, determining the target half-bridge cell and the duration of the operating state of the target half-bridge cell according to the switching state information comprises: and if the switching state information is that the dead zone working mode is switched to the negative half-cycle working mode, taking the first half-bridge unit as a target half-bridge unit, and taking a third preset time length as the duration time length of the working state of the first half-bridge unit. In one embodiment, the third preset time period is greater than or equal to the second dead time period.
In one embodiment, determining the target half-bridge cell and the duration of the operating state of the target half-bridge cell according to the switching state information comprises: and if the switching state information is switched from the dead-zone working mode to the positive half-cycle working mode, taking the second half-bridge unit as a target half-bridge unit, and taking a fourth preset time length as the duration time length of the working state of the second half-bridge unit. In one embodiment, the fourth preset duration is greater than or equal to the first dead zone duration.
Specifically, the control timing of the direct ac-ac conversion circuit can be referred to as shown in fig. 8, where PWM _ Ref is a given PWM reference input for indicating complementary conduction of the first switch and the second switch. For convenience of understanding, the on and off of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 are respectively indicated by timing signals Pre _ PWM1 to Pre _ PWM 4; due to the presence of switching dead zones for the two switches of the two half-bridge units during complementary conduction, i.e.Rising edge delay dead time period t of two switchesdeadTherefore, rising edge delays of dead time duration can be respectively made for Pre _ PWM1 to Pre _ PWM4, and finally the obtained PWMs 1 to PWM4 respectively indicate the on/off of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4, wherein the switches are turned on when the PWMs 1 to PWM4 are at high level.
During the time period t0 to t1, the DAAC is in the positive half cycle operation mode, the first switch Q1 and the second switch Q2 of the first half-bridge unit are in the through state, the third switch Q3 and the fourth switch Q4 of the second half-bridge unit are in the complementary conducting state, and the third switch Q3 and the fourth switch Q4 have a preset dead time period tdead1The circuit structure of the DAAC is shown in fig. 4.
In the time period from t1 to t2, the DAAC is in a transient process of switching from the positive half-cycle operation mode to the dead-time operation mode, the power frequency synchronization signal Sync1 changes at the time of t1, the first half-bridge unit still keeps a through state, the second half-bridge switches from an original complementary conduction state to the dead-time state, that is, the third switch Q3 is turned off, and the fourth switch Q4 is turned on. Specific control may refer to the timing chart shown in fig. 8. It can be understood that, during the transient switching process, after the first switch Q1 is turned off, the third switch Q3 and the fourth switch Q4 are changed in on-off state due to complementary conduction, and the switching between the third switch Q3 and the fourth switch Q4 has the preset dead time duration tdead1That is, the third switch Q3 and the fourth switch Q4 may be in an off state at the same time, and at this time, by controlling the first half bridge unit to be in a through state, that is, the first switch Q1 and the second switch Q2 are simultaneously turned on, in the case that the third switch Q3 is not turned on, the load current has a path no matter whether the load Zo is capacitive or inductive, that is, the load current flows from the p terminal to the Q terminal or from the Q terminal to the p terminal, and thus, a voltage spike may not be caused. the duration from T1 to T2 is a first preset duration Td1In one embodiment, the first preset duration Td1Is greater than or equal to the preset dead zone time tdead1Therefore, the situation that voltage spikes do not occur in the time period from t1 to t2 is guaranteed. Wherein the circuit of the DAAC in this case can refer to fig. 9.
During the period from t2 to t3, the DAAC is in the dead-band operation mode, the first half-bridge unit and the second half-bridge unit are both in the dead-band state, i.e., the first switch Q1 and the third switch Q3 are turned off, while the second switch Q2 and the fourth switch Q4 are turned on, the load current freewheels in the loop formed by the second switch Q2 and the fourth switch Q4, and the circuit of the DAAC is as shown in fig. 5.
In the period from t3 to t4, the DAAC is in a transient process of switching from the dead-zone operation mode to the negative half-cycle operation mode, the power frequency synchronization signal Sync2 changes at time t3, the first half-bridge unit still maintains the dead-zone state, and the second half-bridge unit switches from the original dead-zone state to the through state, that is, both the third switch Q3 and the fourth switch Q4 are turned on, and specific control can refer to a timing chart shown in fig. 8. It can be understood that, during the transient process of switching, when the third switch Q3 is not turned on, the first switch Q1 and the second switch Q2 have changed on-off states due to complementary conduction, and the switching between the first switch Q1 and the second switch Q2 has the preset dead time duration tdead2(not shown), that is, the first switch Q1 and the second switch Q2 may be in an off state at the same time, and at this time, by controlling the first half bridge unit to be still in a dead zone state, that is, the first switch Q1 is off, and the second switch Q2 is on, in the case that the third switch Q3 is not on, the load current has a path no matter whether the load Zo is capacitive or inductive, that is, the load current flows from the p terminal to the Q terminal or from the Q terminal to the p terminal, and thus, no voltage spike is caused. the duration of T3 to T4 is a second preset duration Td2In one embodiment, the second preset duration Td2Is greater than or equal to the second dead time period tdead2Therefore, the situation that voltage spikes do not occur in the time period from t3 to t4 is guaranteed. Wherein the circuit of the DAAC in this case can refer to fig. 5.
During the time period t4 to t5, the DAAC is in the negative half cycle mode of operation, the first switch Q1 and the second switch Q2 of the first half bridge unit are in complementary switching states, and the first switch Q1 and the second switch Q2 have a second dead time period tdead2The third switch Q3 and the fourth switch Q4 of the second half-bridge unit are in the on state, and the circuit structure of the DAAC is as shown in fig. 6.
At t5 to t6In the period, the DAAC is in a transient process of switching from a negative half-cycle working mode to a dead-zone working mode, the power frequency synchronization signal Sync2 is changed at the time t5, the second half-bridge unit still keeps a through state, the first half-bridge unit is switched from an original complementary conduction state to the dead-zone state, namely the first switch Q1 is turned off, and the second switch Q2 is turned on. It is understood that, during the transient process of switching, after the third switch Q3 is turned off, the first switch Q1 and the second switch Q2 are changed in on-off state due to the complementary switches, and the switching between the first switch Q1 and the second switch Q2 has the preset dead time duration tdead2(the situation that two switches of the first half-bridge unit are switched in an on-off state in a period from t5 to t6 is not shown in fig. 8), that is, the first switch Q1 and the second switch Q2 may be in an off state at the same time, and at the same time, by controlling the second half-bridge unit to be in a through state, that is, the third switch Q3 and the fourth switch Q4 are turned on at the same time, and in the situation that the second switch Q2 is not turned on, the load current is passed no matter whether the load Zo is capacitive or inductive, that is, the load current flows from the p end to the Q end or from the Q end to the p end, and therefore, no voltage spike is caused. the duration of T5 to T6 is a third preset duration Td3In one embodiment, the third preset duration Td3Is greater than or equal to the second dead time period tdead2Therefore, the situation that voltage spikes do not occur in the time period from t5 to t6 is guaranteed. Wherein the circuit of the DAAC in this case can refer to fig. 10.
During the period from t6 to t7, the DAAC is in the dead-band operation mode, the first half-bridge unit and the second half-bridge unit are in the dead-band state, i.e., the first switch Q1 and the third switch Q3 are both off, the second switch Q2 and the fourth switch Q4 are both on, the load current freewheels in the loop formed by the second switch Q2 and the fourth switch Q4, and the circuit of the DAAC is as shown in fig. 5.
In a time period from t7 to t8, the DAAC is in a transient process of switching from a dead-zone operation mode to a positive half-cycle operation mode, the power frequency synchronization signal Sync1 changes at time t7, the second half-bridge unit still maintains the dead-zone state, the first half-bridge switches from the original dead-zone state to a through state, that is, the first switch Q1 and the second switch Q2 are both turned on, and specific control can refer to fig. 8Timing diagram of (2). It is understood that during the transient process of switching, when the first switch Q1 is not turned on, the third switch Q3 and the fourth switch Q4 have changed on-off states due to complementary conduction, and the switching between the third switch Q3 and the fourth switch Q4 has the first dead time duration tdead1That is, the first switch Q1 and the second switch Q2 may be in an off state at the same time, and at this time, by controlling the second half-bridge unit to be still in a dead-band state, that is, the third switch Q3 is off, and the fourth switch Q4 is on, in the case that the first switch Q1 is not on, the load current is passed no matter whether the load Zo is capacitive or inductive, that is, the load current flows from the p terminal to the Q terminal or from the Q terminal to the p terminal, and thus, no voltage spike is caused. the duration of T7 to T8 is a fourth preset duration Td4In one embodiment, the fourth preset duration Td4Is greater than or equal to the first dead time period tdead1Therefore, the situation that voltage spikes do not occur in the time period from t7 to t8 is guaranteed. Wherein the circuit of the DAAC in this case can refer to fig. 5.
The time period from t0 to t8 is a complete work cycle of the direct alternating current-alternating current conversion circuit.
The control method of the embodiment can be applied to a direct alternating current-alternating current conversion circuit of which the load is driven by a single-phase induction motor, and the induction heating or voltage regulating power supply.
The embodiment of the invention also provides a direct alternating current-alternating current converter, which comprises a direct alternating current-alternating current conversion circuit and a control module, wherein as shown in fig. 1, the direct alternating current-alternating current conversion circuit comprises a first half-bridge unit and a second half-bridge unit which are connected with each other, the first half-bridge unit comprises a first diode, a second diode, a first switch and a second switch, the second half-bridge unit comprises a third diode, a fourth diode, a third switch and a fourth switch, a cathode of the first diode and a first end of the first switch are all connected with a first end of an alternating current power supply, and an anode of the first diode, a second end of the first switch, a cathode of the second diode and a first end of the second switch are all connected with a first end of a load; the cathode of the third diode and the first end of the third switch are connected with the second end of the alternating current power supply, and the anode of the third diode, the second end of the third switch, the cathode of the fourth diode and the first end of the fourth switch are connected with the second end of the load; the anode of the second diode, the second end of the second switch, the anode of the fourth diode and the second end of the fourth switch are all connected; the on-off states of the first switch and the second switch are used for representing the working state of the first half-bridge unit, and the on-off states of the third switch and the fourth switch are used for representing the working state of the second half-bridge unit; the control module is used for receiving an input alternating voltage signal, controlling the alternating current-alternating current conversion circuit to work in one working mode according to the input alternating voltage signal, then acquiring switching state information of the alternating current-alternating current conversion circuit switched from one working mode to another working mode, and determining the duration of the working states of a target half-bridge unit and a target half-bridge unit according to the switching state information, wherein the target half-bridge unit is at least one of a first half-bridge unit and a second half-bridge unit; and finally, controlling the duration of the working state of the target half-bridge unit to control the load directly connected with the AC-AC conversion circuit to have a follow current path in the process of switching the AC-AC conversion circuit from one working mode to another working mode.
The principle and function of the control device according to the embodiment of the present invention have been specifically described in the embodiment of fig. 7, and are not described herein again.
In one embodiment, the control module is further configured to use the first half-bridge unit as the target half-bridge unit and use a first preset duration as a duration of the operating state of the first half-bridge unit if the switching state information is that the positive half-cycle operating mode is switched to the dead-zone operating mode. In one embodiment, the first preset time period is greater than or equal to a first dead time period, and the first dead time period is a delay time period of the complementary switching process of the third switch and the fourth switch when the first half-bridge unit and the second half-bridge unit are in the complementary conducting state.
In one embodiment, the control module is further configured to use the second half-bridge unit as the target half-bridge unit and use a second preset duration as the duration of the operating state of the second half-bridge unit if the switching state information includes switching from the negative half-cycle operating mode to the dead-band operating mode. In one embodiment, the second preset time period is greater than or equal to a second dead time period, and the second dead time period is a delay time period of the first half bridge unit in the complementary conducting state during the complementary switching process of the first switch and the second switch.
In one embodiment, the control module is further configured to use the first half-bridge unit as the target half-bridge unit and use a third preset duration as the duration of the operating state of the first half-bridge unit if the switching state information indicates that the dead-zone operating mode is switched to the negative half-cycle operating mode. In one embodiment, the third preset time period is greater than or equal to the second dead time period.
In one embodiment, the control module is further configured to use the second half-bridge unit as the target half-bridge unit and use a fourth preset duration as the duration of the operating state of the second half-bridge unit if the switching state information indicates that the dead-band operating mode is switched to the positive half-cycle operating mode. In one embodiment, the fourth preset duration is greater than or equal to the first dead zone duration.
The embodiment of the present invention further provides an induction heating apparatus, which includes a load and the direct ac-ac converter described in the above embodiment, wherein the load is an inductive load.
Wherein, the load Zo is used for receiving the electric energy output by the direct ac-ac conversion circuit, as shown in fig. 11, wherein a first end of the load is connected to an anode of the first diode D1 and a cathode of the second diode D2 in the first half-bridge unit, respectively; the second terminal of the load is connected to the anode of the third diode D3 and the cathode of the fourth diode D4 in the second half-bridge cell, respectively.
In one embodiment, the load includes a resistor R, an inductor L, and a resonant capacitor Cr. The first end of the resistor is connected with the anode of the first diode D1 and the cathode of the second diode D2 in the first half-bridge unit, respectively, the first end of the inductor is connected with the second end of the resistor, the first end of the resonant capacitor is connected with the second end of the inductor, and the second end of the resonant capacitor is connected with the anode of the third diode D3 and the cathode of the fourth diode D4 in the second half-bridge unit, respectively.
The embodiment of the invention also provides a power adjusting method which is applied to the induction heating device and comprises the steps S210 to S220.
Step S210, obtaining a target power of the load.
The target power can be the rated power of the load, and can also be manually set according to the requirements of working conditions.
Step S220, respectively adjusting the switching frequency of the first switch and the second switch in the negative half-cycle working mode according to the target power; and/or respectively adjusting the switching frequency of a third switch and a fourth switch in the second half-bridge unit in the positive half-cycle working mode according to the target power so that the power value of the load reaches the target power after the load receives the output signal of the direct alternating current-alternating current conversion circuit.
After the target power of the load is obtained, in order to enable the power value of the load to reach the target power after the load receives the output signal of the direct alternating current-alternating current conversion circuit, the switching frequencies of the first switch and the second switch in the first half-bridge unit under the negative half-cycle working mode can be independently adjusted, the switching frequencies of the third switch and the fourth switch in the second half-bridge unit under the positive half-cycle working mode can also be independently adjusted, or the switching frequencies of the first switch and the second switch in the first half-bridge unit under the negative half-cycle working mode and the switching frequencies of the third switch and the fourth switch in the second half-bridge unit under the positive half-cycle working mode can be simultaneously adjusted.
The first switch and the second switch of the first half-bridge unit are in complementary conducting states in the negative half-cycle working mode, so that the conducting duration of the two switches can be changed by adjusting the switching frequency of the first switch and the second switch, and the power value of the load reaches the target power after the load receives the output signal Vo of the alternating current-alternating current conversion circuit.
In one embodiment, the direct ac-to-ac conversion circuit performs a positive half cycle mode, a dead band mode, and a negative half cycle mode of operation during the duty cycle, and the power regulation method further includes regulating the number of duty cycles of the direct ac-to-ac conversion circuit based on the target power.
It can be understood that, under the condition of limited frequency modulation gain, cycle control may be adopted, that is, the output signal of the direct ac-ac conversion circuit is a complete sine wave but the number of the working cycles is not fixed, so as to achieve the power value of the load to reach the target power by changing the number of the working cycles of the direct ac-ac conversion circuit. For example, taking 5 sine waves as an example, if the power value of the load when receiving 5 sine waves is P, and the target power is 80% of P, the direct ac-ac conversion circuit can be controlled to output only 4 sine wave output signals.
In one embodiment, the power regulation method further includes controlling the on-off duration of a first switch of the first half bridge unit and the on-off duration of a second switch of the first half bridge unit in the negative half cycle operation mode to be the same; and/or controlling the on-off duration of the third switch of the second half-bridge unit and the on-off duration of the fourth switch of the second half-bridge unit in the positive half-cycle operation mode to be the same.
The on-off duration includes an on duration and an off duration. In order to facilitate the adjustment of the switching frequency, the on-duration and the off-duration of the first switch Q1 and the second switch Q2 of the first half bridge unit may be controlled to be the same individually, or the on-duration and the off-duration of the third switch Q3 and the fourth switch Q4 of the second half bridge unit may be controlled to be the same individually, or the on-duration and the off-duration of the first switch Q1 and the second switch Q2 of the first half bridge unit may be controlled to be the same simultaneously, and the on-duration and the off-duration of the third switch Q3 and the fourth switch Q4 of the second half bridge unit may be controlled to be the same simultaneously.
When the load connected to the direct ac-ac conversion circuit is an inductive load, that is, the load includes a resistor R, an inductor L and a resonant capacitor Cr, and the on-time and the off-time of the first switch Q1 and the second switch Q2 of the first half-bridge unit are controlled to be the same, and the on-time and the off-time of the third switch Q3 and the fourth switch Q4 of the second half-bridge unit are controlled to be the same, the target power is reached by adjusting the switching frequency of the first switch and the second switch in the first half-bridge unit in the negative half-cycle operating mode and the switching frequency of the third switch and the fourth switch in the second half-bridge unit in the positive half-cycle operating mode, the output voltage Vo and the load current ILWith a voltage VacThe waveform comparison between the above can be seen with reference to fig. 12.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of any of the above-mentioned control method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A control method of a direct alternating current-alternating current conversion circuit is characterized in that the direct alternating current-alternating current conversion circuit comprises a first half-bridge unit and a second half-bridge unit which are connected with each other, the first half-bridge unit comprises a first diode, a second diode, a first switch and a second switch, and the second half-bridge unit comprises a third diode, a fourth diode, a third switch and a fourth switch; the on-off states of the first switch and the second switch are used for representing the working state of the first half-bridge unit, and the on-off states of the third switch and the fourth switch are used for representing the working state of the second half-bridge unit, and the control method comprises the following steps:
receiving an input alternating voltage signal, and controlling the direct alternating current-alternating current conversion circuit to work in a working mode according to the input alternating voltage signal;
acquiring switching state information of the direct alternating current-alternating current conversion circuit from one working mode to another working mode;
determining the duration of the target half-bridge unit and the working state thereof according to the switching state information; the target half-bridge cell is at least one of the first half-bridge cell and the second half-bridge cell;
and controlling the target half-bridge unit to maintain the working state for the duration so as to control the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, wherein a load connected with the direct alternating current-alternating current conversion circuit has a free-wheeling path.
2. The method of claim 1, wherein determining the duration of the target half-bridge unit and its operating state according to the switching state information comprises:
and if the switching state information is that the positive half-cycle working mode is switched to the dead-zone working mode, taking the first half-bridge unit as the target half-bridge unit, and taking a first preset time length as the duration time length of the working state of the first half-bridge unit.
3. The method for controlling a direct AC-AC conversion circuit according to claim 2,
the first preset time is longer than or equal to a first dead time, and the first dead time is a delay time of the second half-bridge unit in a complementary conduction state in the process of complementary switching of the third switch and the fourth switch.
4. The method of claim 1, wherein determining the duration of the target half-bridge unit and its operating state according to the switching state information comprises:
and if the switching state information comprises a mode switched from a negative half-cycle working mode to a dead-zone working mode, taking the second half-bridge unit as the target half-bridge unit, and taking a second preset time length as the duration time length of the working state of the second half-bridge unit.
5. The method as claimed in claim 4, wherein the second predetermined period is greater than or equal to a second dead time period, and the second dead time period is a delay period of the first half bridge unit in the complementary conducting state during the complementary switching of the first switch and the second switch.
6. The method of claim 1, wherein determining the duration of the target half-bridge unit and its operating state according to the switching state information comprises:
and if the switching state information is switched from a dead zone working mode to a negative half-cycle working mode, taking the first half-bridge unit as the target half-bridge unit, and taking a third preset time length as the duration time length of the working state of the first half-bridge unit.
7. The method of claim 6, wherein the third predetermined period is greater than or equal to the second dead time period.
8. The method of claim 1, wherein determining the duration of the target half-bridge unit and its operating state according to the switching state information comprises:
and if the switching state information is switched from a dead-zone working mode to a positive half-cycle working mode, taking the second half-bridge unit as the target half-bridge unit, and taking a fourth preset time length as the duration time length of the working state of the second half-bridge unit.
9. The method of claim 8, wherein the fourth predetermined period is greater than or equal to the first dead time period.
10. A direct ac-ac converter, comprising:
the direct alternating current-alternating current conversion circuit comprises a first half-bridge unit and a second half-bridge unit which are connected with each other, wherein the first half-bridge unit comprises a first diode, a second diode, a first switch and a second switch, and the second half-bridge unit comprises a third diode, a fourth diode, a third switch and a fourth switch; the on-off states of the first switch and the second switch are used for representing the working state of the first half-bridge unit, and the on-off states of the third switch and the fourth switch are used for representing the working state of the second half-bridge unit; and
a control module for controlling the operation of the at least one processor,
receiving an input alternating voltage signal, and controlling the direct alternating current-alternating current conversion circuit to work in a working mode according to the input alternating voltage signal;
acquiring switching state information of the direct alternating current-alternating current conversion circuit from one working mode to another working mode;
determining the duration of the target half-bridge unit and the working state thereof according to the switching state information; the target half-bridge cell is at least one of the first half-bridge cell and the second half-bridge cell;
and controlling the target half-bridge unit to maintain the working state for the duration so as to control the direct alternating current-alternating current conversion circuit to be switched from one working mode to another working mode, wherein a load connected with the direct alternating current-alternating current conversion circuit has a free-wheeling path.
11. An induction heating device comprising the direct ac-ac converter of claim 10 and a load, wherein the load is an inductive load.
12. A method of power regulation, applied to an induction heating device, the method comprising:
acquiring target power of a load;
respectively adjusting the switching frequency of the first switch and the second switch in a negative half-cycle working mode according to the target power; and/or
And respectively adjusting the switching frequency of the third switch and the fourth switch in a positive half-cycle working mode according to the target power so that the power value of the load reaches the target power after the load receives the output signal of the direct alternating current-alternating current conversion circuit.
13. The power conditioning method of claim 12 wherein the direct ac-to-ac conversion circuit performs a positive half cycle mode of operation, a dead band mode of operation, and a negative half cycle mode of operation during a duty cycle, the power conditioning method further comprising:
and adjusting the number of working cycles of the direct alternating current-alternating current conversion circuit according to the target power.
14. The power regulation method of claim 12, further comprising:
controlling the on-off duration of the first switch and the second switch to be the same under the negative half-cycle working mode; and/or
And controlling the on-off duration of the third switch and the fourth switch to be the same in the positive half-cycle working mode.
15. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the control method according to any one of claims 1 to 9.
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