CN114070097B - Driving control method of alternating current conversion circuit and related device - Google Patents
Driving control method of alternating current conversion circuit and related device Download PDFInfo
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- CN114070097B CN114070097B CN202111164318.XA CN202111164318A CN114070097B CN 114070097 B CN114070097 B CN 114070097B CN 202111164318 A CN202111164318 A CN 202111164318A CN 114070097 B CN114070097 B CN 114070097B
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Classifications
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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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- 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
Abstract
The application provides a driving control method of an alternating current conversion circuit and a related device, wherein the method comprises the following steps: acquiring the input voltage of an alternating current conversion circuit at the current moment; if the alternating current conversion circuit is in a positive and negative half-cycle state and the input voltage is in a first preset range at the current moment, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half-cycle state; if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage exceeds a first preset range under the preset condition, controlling the alternating current conversion circuit to enter a positive half-cycle state and a negative half-cycle state from the zero-crossing dead zone state; in the zero-crossing dead zone state, the first bidirectional switch module is controlled to be turned on, and the second bidirectional switch module is controlled to be turned off; in the positive and negative half cycle states, the ac conversion circuit is in an active mode or a freewheel mode. Through the scheme, the method and the device can set strict zero-crossing dead zone exit conditions, and avoid damage to the alternating current conversion circuit device caused by drive co-conduction.
Description
Technical Field
The present application relates to the field of circuit control technologies, and in particular, to a driving control method and a related device for an ac conversion circuit.
Background
At present, because rated power consumption parameters of electric equipment are different, an alternating current voltage reduction circuit is generally adopted to reduce the voltage of alternating current and then output the alternating current to the electric equipment for use, so that the electric equipment can work normally.
Based on the input voltage of the ac voltage-reducing circuit, the control mode of the ac voltage-reducing circuit is generally divided into positive half-cycle driving and negative half-cycle driving, however, when the system is short-circuited, the voltage near the zero crossing point of the mains supply jumps back and forth at the zero crossing point, and at this time, the sampling speed is not equal to the positive and negative variation speed of the mains supply voltage, so that the driving time sequence is not matched with the positive and negative half cycles of the input voltage, and the driving common conduction is caused, and the IGBT (Insulated Gate Bipolar Transistor ) is damaged by overcurrent.
Disclosure of Invention
In view of the above, the invention provides a driving control method and related device for an ac conversion circuit, which can solve the problem that the switching tube is damaged when the mains supply jumps back and forth at a zero crossing point at high frequency.
In a first aspect, an embodiment of the present invention provides a driving control method for an ac conversion circuit, where the ac conversion circuit includes a first bidirectional switch module, a second bidirectional switch module, and an energy storage module;
The first end of the first bidirectional switch module is connected with the first end of the alternating current conversion circuit, the second end of the first bidirectional switch module is respectively connected with the first end of the second bidirectional switch module and the first end of the energy storage module, and the second end of the second bidirectional switch module is connected with the second end of the alternating current conversion circuit; the second end of the energy storage module is connected with the third end of the alternating current conversion circuit;
the method comprises the following steps:
acquiring the input voltage of the alternating current conversion circuit at the current moment;
if the alternating current conversion circuit is in a positive and negative half cycle state and the input voltage is in a first preset range at the current moment, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half cycle state;
if the alternating current conversion circuit is in a zero-crossing dead zone state and the input voltage exceeds the first preset range under the condition that the preset condition is met, controlling the alternating current conversion circuit to enter the positive and negative half cycle state from the zero-crossing dead zone state;
in the zero-crossing dead zone state, controlling the first bidirectional switch module to be turned on and controlling the second bidirectional switch module to be turned off; and in the positive and negative half cycle state, controlling the on-off of the first bidirectional switch module and the second bidirectional switch module so as to enable the alternating current conversion circuit to be in an active mode or a follow current mode.
In a second aspect, an embodiment of the present invention provides a controller comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of the possible implementations of the first aspect above when the computer program is executed.
In a third aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described in any one of the possible implementations of the first aspect above.
In a fourth aspect, embodiments of the present invention provide an ac buck system including an ac conversion circuit and a controller as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
firstly, acquiring the input voltage of the alternating current conversion circuit at the current moment; if the alternating current conversion circuit is in a positive and negative half cycle state and the input voltage is in a first preset range at the current moment, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half cycle state; if the alternating current conversion circuit is in a zero-crossing dead zone state and the input voltage exceeds the first preset range under the condition that the preset condition is met, controlling the alternating current conversion circuit to enter the positive and negative half cycle state from the zero-crossing dead zone state; finally, in the zero-crossing dead zone state, the first bidirectional switch module is controlled to be turned on, and the second bidirectional switch module is controlled to be turned off; and in the positive and negative half cycle state, controlling the on-off of the first bidirectional switch module and the second bidirectional switch module so as to enable the alternating current conversion circuit to be in an active mode or a follow current mode. Through the scheme, the embodiment can set strict zero-crossing dead zone exit conditions, so that the problem that the driving time sequence is not matched with the positive half cycle and the negative half cycle of the input voltage due to the fact that the zero-crossing dead zone state exit conditions are too sensitive and the system response action is slower when the mains supply zero-crossing condition is severe is avoided, and the problem that an alternating current conversion circuit device is damaged due to driving co-conduction is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an AC conversion circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of an implementation method of a driving control method of an ac conversion circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of non-complementary driving pulses provided by an embodiment of the present invention;
fig. 4a is a signal flow diagram of an ac conversion circuit in an active mode when an input voltage is in a positive half cycle according to an embodiment of the present invention, fig. 4b is a signal flow diagram of an ac conversion circuit in an active mode when an input voltage is in a negative half cycle according to an embodiment of the present invention, fig. 4c is a signal flow diagram of an ac conversion circuit in a freewheel mode when an input voltage is in a positive half cycle according to an embodiment of the present invention, fig. 4d is a signal flow diagram of an ac conversion circuit in a freewheel mode when an input voltage is in a negative half cycle according to an embodiment of the present invention, fig. 4e is a signal flow diagram of an ac conversion circuit in a dead zone mode when an input voltage is in a positive half cycle according to an embodiment of the present invention, and fig. 4f is a signal flow diagram of an ac conversion circuit in a dead zone mode when an input voltage is in a negative half cycle according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a controller according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
In one embodiment, the driving control method provided in the present embodiment may be applied to an ac conversion circuit, where the ac conversion circuit may be an ac buck circuit or an ac boost circuit, and fig. 1 is a schematic circuit diagram of the ac buck circuit provided in the embodiment of the present invention. As shown in fig. 1, the ac buck circuit includes a first bidirectional switch module, a second bidirectional switch module, and an energy storage module;
the first end of the first bidirectional switch module is connected with the first end of the alternating current conversion circuit, the second end of the first bidirectional switch module is respectively connected with the first end of the second bidirectional switch module and the first end of the energy storage module, and the second end of the second bidirectional switch module is connected with the second end of the alternating current conversion circuit; the second end of the energy storage module is connected with the third end of the alternating current conversion circuit.
The first bidirectional switch module comprises a first switch tube T1 and a second switch tube T2; the first switching tube T1 and the second switching tube T2 are connected in reverse series between the first end and the second end of the first bidirectional switching module; the second bidirectional switch module comprises a third switch tube T3 and a fourth switch tube T4; and the third switching tube T3 and the fourth switching tube T4 are reversely connected in series between the first end and the second end of the second bidirectional switch module.
The energy storage module comprises an inductor L, a first end of the inductor L is connected with a second end of the first bidirectional switch module, a second end of the inductor L is respectively connected with a third end of the alternating current buck circuit and a first end of a capacitor C, and a second end of the capacitor C is connected with a second end of the alternating current buck circuit.
The first switching tube, the second switching tube, the third switching tube and the fourth switching tube comprise triodes and diodes which are connected in parallel in an anti-parallel mode so as to realize a bidirectional conduction function.
The execution body of the embodiment is a controller of an ac conversion circuit.
The ac buck chopper circuit provided in this embodiment is identical to the dc chopper circuit in terms of the operation principle, but has a large difference in control manner. The dc buck chopper circuit only needs to apply the high frequency drive pulse to the main power switch, while the freewheeling diode does not need to be controlled. In the ac conversion circuit, both the bidirectional switching transistor functioning as chopper and the bidirectional switching transistor functioning as freewheel need to be controlled, and complementary alternate operations are required. It is therefore necessary to provide dead zones for complementarily operating switching tubes during control to prevent input voltage source shorts from causing damage to switching tubes in the circuit.
Complementary control is not a good method because of the specificity of the ac conversion circuit compared to the bridge circuit. In the complementary control, when the input voltage is in the positive half cycle, the first switch tube and the fourth switch Guan Gao are complementary in frequency, and when the input voltage is in the negative half cycle, the second switch tube and the third switch tube are complementary in high frequency, and no matter whether the phases of the voltage and the current are consistent, the existence of dead zone can lead to current interruption on the inductor. Thus, the AC conversion circuit adopts a non-complementary driving pulse control method, and a non-complementary driving pulse diagram is shown in FIG. 3, wherein U is as follows in Representing input voltage, U o Representing the output voltage, U g1 Representing the driving signal of the first switching tube, U g2 Representing the driving signal of the second switching tube, U g3 Representing the driving signal of the third switching tube, U g4 Representing the drive signal of the fourth switching tube. Under the control of the driving pulse shown in fig. 3, the ac conversion circuit operates in three operation modes, i.e., an active mode, a freewheel mode and a dead zone mode, in one switching cycle. As shown in fig. 4a to 4f, fig. 4a shows the signal flow direction of the ac conversion circuit in the active mode when the input voltage is in the positive half cycle, fig. 4b shows the signal flow direction of the ac conversion circuit in the active mode when the input voltage is in the negative half cycle, fig. 4c shows the signal flow direction of the ac conversion circuit in the freewheel mode when the input voltage is in the positive half cycle, fig. 4d shows the signal flow direction of the ac conversion circuit in the freewheel mode when the input voltage is in the negative half cycle, fig. 4e shows the signal flow direction of the ac conversion circuit in the dead zone mode when the input voltage is in the positive half cycle, and fig. 4f shows the signal flow direction of the ac conversion circuit in the dead zone mode when the input voltage is in the negative half cycle.
In FIGS. 4a-4f, U in Representing input voltage, U o Representing the output voltage, i o Representing the inductor current. As can be seen from fig. 4a-4f, in each mode of operation, the input voltage is at positive and negative half cycles and the circuit has a loop. The first switching tube TV1 and the second switching tube TV2 which play a role in chopping and the third switching tube T3 and the fourth switching tube T4 which play a role in freewheeling are all required to be controlled and are complementedAlternately works. With this mode, the current on the output inductor has a freewheeling loop regardless of whether the voltage and current phases are identical.
Because of the non-complementary driving control mode, accurate judgment of the positive half cycle and the negative half cycle of the input voltage is required, if the driving time sequence is not matched with the positive half cycle and the negative half cycle of the input voltage, the input voltage source is short-circuited, and therefore the driving tube is damaged. The actual sampling circuit can appear the phenomenon of shake near mains supply (input voltage) zero crossing, and positive and negative half cycle of mains supply voltage will not accurately judge at this moment.
In order to ensure the stability of the system, the present embodiment proposes a concept of zero-crossing dead zone, i.e. when the mains voltage is within a first preset range, it is determined to enter a zero-crossing dead zone state. Therefore, the control state of the circuit can be divided into three states according to the positive and negative of the input voltage: positive half cycle state, negative half cycle state, zero crossing dead zone state.
As shown in fig. 2, fig. 2 shows an implementation flow of a driving control method of an ac conversion circuit, and the process is described in detail below;
s101: and acquiring the input voltage of the alternating current conversion circuit at the current moment.
Specifically, the input voltage is the mains voltage. The embodiment can collect the instantaneous value of the mains voltage as the input voltage to carry out the subsequent judgment flow.
S102: and if the alternating current conversion circuit is in a positive and negative half cycle state and the input voltage is in a first preset range at the current moment, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half cycle state.
S103: and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage exceeds the first preset range under the condition that the preset condition is met, controlling the alternating current conversion circuit to enter the positive and negative half cycle state from the zero-crossing dead zone state.
S104: in the zero-crossing dead zone state, controlling the first bidirectional switch module to be turned on and controlling the second bidirectional switch module to be turned off; and in the positive and negative half cycle state, controlling the on-off of the first bidirectional switch module and the second bidirectional switch module so as to enable the alternating current conversion circuit to be in an active mode or a follow current mode.
Because the alternating current voltage reduction circuit has strict requirements on the driving time sequence, the zero-crossing dead zone is required to be excessively changed, the stability of the driving time sequence is ensured, and the zero-crossing dead zone state cannot be easily exited when the specific state of the mains voltage cannot be ensured; therefore, a wide-in and wide-out scheme is adopted for the judgment condition of the zero-crossing dead zone state.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
the specific implementation flow of S102 includes:
if the alternating current conversion circuit is in a positive half cycle state and the input voltage lasts for a first preset time to be smaller than the first preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the positive half cycle state;
and if the alternating current conversion circuit is in a negative half cycle state and the input voltage continues for a first preset time to be larger than the second preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the negative half cycle state.
Specifically, the above procedure gives a judgment flow for entering the zero-crossing dead zone. The first preset threshold may be 100V, the second preset threshold may be-100V, and the first preset time may be 100us. When the alternating current conversion circuit is in a positive half cycle state and the input voltage lasts for 100us to be less than 100V, the alternating current conversion circuit is controlled to be switched from the positive half cycle state to a zero-crossing dead zone state. When the alternating current conversion circuit is in a negative half-cycle state and the input voltage lasts for 100us to be more than-100V, the alternating current conversion circuit is controlled to be switched from the negative half-cycle state to a zero-crossing dead zone state.
In one embodiment, the specific implementation procedure of S103 includes:
s201: if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage exceeds the first preset range and the input voltage monotonically changes at the first N moments of the current time, the alternating current conversion circuit is controlled to enter the positive and negative half cycle state from the zero-crossing dead zone state;
or S202: and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to exceed the first preset range, controlling the alternating current conversion circuit to enter the positive and negative half cycle states from the zero-crossing dead zone state.
In this embodiment, in order to meet the condition of wide in and out, the second preset time may be set to be longer than the first preset time. For example, N may take a value of 6, and the second preset time may be 400us.
Through the process, the problem of drive co-conduction caused by the fact that the circuit exits from the zero-crossing dead zone state when the voltage jump amplitude of the commercial power is larger near the zero point and the oscillation frequency is larger than the sampling frequency/the control frequency can be avoided, and therefore stability of the circuit is improved.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
the specific implementation flow of S201 includes:
if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is larger than or equal to the first preset threshold value, and the input voltage monotonically increases at the first N times of the current time, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is smaller than or equal to the second preset threshold value, and the input voltage monotonically decreases at the first N times of the current time, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
the specific implementation flow of S202 includes:
if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be greater than or equal to the first preset threshold value, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be smaller than or equal to the second preset threshold value, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
In one embodiment, the specific implementation procedure of S104 includes:
and in the zero-crossing dead zone state, controlling the first switching tube and the second switching tube to be fully conducted, and controlling the third switching tube and the fourth switching tube to be fully turned off.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the specific implementation flow of S104 further includes:
In the positive half-cycle state, the first switching tube and the third switching tube are controlled to be conducted through a preset duty ratio, and the second switching tube and the fourth switching tube are controlled to be continuously conducted; the first switching tube and the third switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the first switching tube is conducted and the third switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the first switching tube is turned off and the third switching tube is conducted;
in the negative half-cycle state, the second switching tube and the fourth switching tube are controlled to be conducted through a preset duty ratio, and the first switching tube and the third switching tube are controlled to be continuously conducted; the second switching tube and the fourth switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the second switching tube is conducted and the fourth switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the second switching tube is turned off and the fourth switching tube is conducted.
Through the scheme, when the short circuit is found, the controller judges that the zero-crossing dead zone state is near the zero crossing of the mains supply, and the zero-crossing dead zone state is deactuated only when the mains supply voltage is definitely positive half cycle or negative half cycle, so that the problem of overcurrent damage of a circuit switching tube device is avoided, and the stable operation of a circuit is ensured.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
The embodiment of the invention provides a drive control device of an alternating current conversion circuit, which only shows the relevant parts of the embodiment for convenience of explanation, and the details are as follows:
the alternating current conversion circuit comprises a first bidirectional switch module, a second bidirectional switch module and an energy storage module;
the first end of the first bidirectional switch module is connected with the first end of the alternating current conversion circuit, the second end of the first bidirectional switch module is respectively connected with the first end of the second bidirectional switch module and the first end of the energy storage module, and the second end of the second bidirectional switch module is connected with the second end of the alternating current conversion circuit; the second end of the energy storage module is connected with the third end of the alternating current conversion circuit;
a drive control device for an AC conversion circuit includes:
The voltage acquisition module is used for acquiring the input voltage of the alternating current conversion circuit at the current moment;
the dead zone entering judging module is used for controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half-cycle state if the alternating current conversion circuit is in the positive and negative half-cycle state and the input voltage is in a first preset range at the current time;
the dead zone exit judging module is used for controlling the alternating current conversion circuit to enter the positive half cycle state and the negative half cycle state from the zero-crossing dead zone state if the alternating current conversion circuit is in the zero-crossing dead zone state at the current time and the input voltage exceeds the first preset range under the preset condition;
the control module is used for controlling the first bidirectional switch module to be conducted and controlling the second bidirectional switch module to be turned off in the zero-crossing dead zone state; and in the positive and negative half cycle state, controlling the on-off of the first bidirectional switch module and the second bidirectional switch module so as to enable the alternating current conversion circuit to be in an active mode or a follow current mode.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
The dead zone entering judging module is specifically configured to:
if the alternating current conversion circuit is in a positive half cycle state and the input voltage lasts for a first preset time to be smaller than the first preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the positive half cycle state;
and if the alternating current conversion circuit is in a negative half cycle state and the input voltage continues for a first preset time to be larger than the second preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the negative half cycle state.
In one embodiment, the dead zone exit determination module includes:
the first judging unit is used for controlling the alternating current conversion circuit to enter the positive half cycle state and the negative half cycle state from the zero-crossing dead zone state if the alternating current conversion circuit is in the zero-crossing dead zone state at the current time, the input voltage exceeds the first preset range, and the input voltage monotonically changes at the first N moments of the current time;
or the second judging unit is used for controlling the alternating current conversion circuit to enter the positive and negative half cycle state from the zero-crossing dead zone state if the alternating current conversion circuit is in the zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to exceed the first preset range.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
the first judgment unit includes:
if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is larger than or equal to the first preset threshold value, and the input voltage monotonically increases at the first N times of the current time, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is smaller than or equal to the second preset threshold value, and the input voltage monotonically decreases at the first N times of the current time, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
The second judgment unit includes:
if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be greater than or equal to the first preset threshold value, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be smaller than or equal to the second preset threshold value, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
In one embodiment, the first bidirectional switching module includes a first switching tube and a second switching tube; the first switching tube and the second switching tube are reversely connected in series between the first end and the second end of the first bidirectional switching module; the second bidirectional switch module comprises a third switch tube and a fourth switch tube; the third switching tube and the fourth switching tube are connected in reverse series between the first end and the second end of the second bidirectional switch module;
the control module includes:
and the dead zone control unit is used for controlling the first switching tube and the second switching tube to be all conducted and controlling the third switching tube and the fourth switching tube to be all turned off under the zero-crossing dead zone state.
In one embodiment, the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first bidirectional switch module comprises a first switch tube and a second switch tube; the first switching tube and the second switching tube are reversely connected in series between the first end and the second end of the first bidirectional switching module; the second bidirectional switch module comprises a third switch tube and a fourth switch tube; the third switching tube and the fourth switching tube are connected in reverse series between the first end and the second end of the second bidirectional switch module;
the control module further includes:
the positive half cycle control unit is used for controlling the first switching tube and the third switching tube to be conducted through a preset duty ratio in the positive half cycle state and controlling the second switching tube and the fourth switching tube to be continuously conducted; the first switching tube and the third switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the first switching tube is conducted and the third switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the first switching tube is turned off and the third switching tube is conducted;
the negative half cycle control unit is used for controlling the second switching tube and the fourth switching tube to be conducted through a preset duty ratio in the negative half cycle state and controlling the first switching tube and the third switching tube to be continuously conducted; the second switching tube and the fourth switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the second switching tube is conducted and the fourth switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the second switching tube is turned off and the fourth switching tube is conducted.
Fig. 5 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 5, the terminal 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in said memory 51 and executable on said processor 50. The processor 50, when executing the computer program 52, implements the steps of the drive control method embodiment of each ac conversion circuit described above, for example, steps 101 to 104 shown in fig. 2. Alternatively, the processor 50, when executing the computer program 52, performs the functions of the modules/units of the apparatus embodiments described above.
By way of example, the computer program 52 may be partitioned into one or more modules/units that are stored in the memory 51 and executed by the processor 50 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions describing the execution of the computer program 52 in the terminal 5.
The terminal 5 may include, but is not limited to, a processor 50, a memory 51. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the terminal 5 and is not limiting of the terminal 5, and may include more or fewer components than shown, or may combine some components, or different components, e.g., the terminal may further include input and output devices, network access devices, buses, etc.
The processor 50 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated CircUint, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 51 may be an internal storage unit of the terminal 5, such as a hard disk or a memory of the terminal 5. The memory 51 may be an external storage device of the terminal 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the terminal 5. The memory 51 is used for storing the computer program as well as other programs and data required by the terminal. The memory 51 may also be used to temporarily store data that has been output or is to be output.
In one embodiment, the present embodiment provides an ac buck system, which includes an ac conversion circuit and a controller.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/controller and method may be implemented in other manners. For example, the apparatus/controller embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the method embodiment of driving and controlling the respective ac conversion circuits when the computer program is executed by the processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The driving control method of the alternating current conversion circuit is characterized in that the alternating current conversion circuit comprises a first bidirectional switch module, a second bidirectional switch module and an energy storage module;
the first end of the first bidirectional switch module is connected with the first end of the alternating current conversion circuit, the second end of the first bidirectional switch module is respectively connected with the first end of the second bidirectional switch module and the first end of the energy storage module, and the second end of the second bidirectional switch module is connected with the second end of the alternating current conversion circuit; the second end of the energy storage module is connected with the third end of the alternating current conversion circuit;
The method comprises the following steps:
acquiring the input voltage of the alternating current conversion circuit at the current moment;
if the alternating current conversion circuit is in a positive and negative half cycle state and the input voltage is in a first preset range at the current moment, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half cycle state;
if the alternating current conversion circuit is in the zero-crossing dead zone state and the input voltage exceeds the first preset range under the condition that the preset condition is met, controlling the alternating current conversion circuit to enter the positive and negative half cycle state from the zero-crossing dead zone state;
in the zero-crossing dead zone state, controlling the first bidirectional switch module to be turned on and controlling the second bidirectional switch module to be turned off; and in the positive and negative half cycle state, controlling the on-off of the first bidirectional switch module and the second bidirectional switch module so as to enable the alternating current conversion circuit to be in an active mode or a follow current mode.
2. The drive control method of an ac conversion circuit according to claim 1, wherein the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
And if the alternating current conversion circuit is in a positive and negative half cycle state and the input voltage is in a first preset range at the current time, controlling the alternating current conversion circuit to enter a zero-crossing dead zone state from the positive and negative half cycle state, wherein the method comprises the following steps:
if the alternating current conversion circuit is in a positive half cycle state and the input voltage lasts for a first preset time to be smaller than the first preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the positive half cycle state;
and if the alternating current conversion circuit is in a negative half cycle state and the input voltage continues for a first preset time to be larger than the second preset threshold value at the current time, controlling the alternating current conversion circuit to enter the zero-crossing dead zone state from the negative half cycle state.
3. The drive control method of an ac conversion circuit according to claim 1, wherein if the ac conversion circuit is in the zero-crossing dead zone state at the current time and the input voltage exceeds the first preset range under the satisfaction of a preset condition, controlling the ac conversion circuit to enter the positive and negative half cycle states from the zero-crossing dead zone state includes:
If the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage exceeds the first preset range and the input voltage monotonically changes at the first N moments of the current time, the alternating current conversion circuit is controlled to enter the positive and negative half cycle state from the zero-crossing dead zone state;
or if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to exceed the first preset range, controlling the alternating current conversion circuit to enter the positive and negative half cycle states from the zero-crossing dead zone state.
4. The drive control method of an ac conversion circuit according to claim 3, wherein the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
and if the ac conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage exceeds the first preset range, and the input voltage monotonically changes at the first N times of the current time, controlling the ac conversion circuit to enter the positive and negative half cycle states from the zero-crossing dead zone state, including:
If the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is larger than or equal to the first preset threshold value, and the input voltage monotonically increases at the first N times of the current time, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time, the input voltage is smaller than or equal to the second preset threshold value, and the input voltage monotonically decreases at the first N times of the current time, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
5. The drive control method of an ac conversion circuit according to claim 3, wherein the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first preset range comprises a first preset threshold value and a second preset threshold value, wherein the first preset threshold value is larger than zero, and the second preset threshold value is smaller than zero;
and if the ac conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to exceed the first preset range, controlling the ac conversion circuit to enter the positive and negative half cycle states from the zero-crossing dead zone state, including:
If the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be greater than or equal to the first preset threshold value, controlling the alternating current conversion circuit to enter the positive half cycle state from the zero-crossing dead zone state;
and if the alternating current conversion circuit is in a zero-crossing dead zone state at the current time and the input voltage continues for a second preset time to be smaller than or equal to the second preset threshold value, controlling the alternating current conversion circuit to enter the negative half cycle state from the zero-crossing dead zone state.
6. The drive control method of an ac conversion circuit according to any one of claims 1 to 5, wherein the first bidirectional switching module includes a first switching tube and a second switching tube; the first switching tube and the second switching tube are reversely connected in series between the first end and the second end of the first bidirectional switching module; the second bidirectional switch module comprises a third switch tube and a fourth switch tube; the third switching tube and the fourth switching tube are connected in reverse series between the first end and the second end of the second bidirectional switch module;
and in the zero-crossing dead zone state, controlling the first bidirectional switch module to be turned on and controlling the second bidirectional switch module to be turned off, including:
And in the zero-crossing dead zone state, controlling the first switching tube and the second switching tube to be fully conducted, and controlling the third switching tube and the fourth switching tube to be fully turned off.
7. The drive control method of an ac conversion circuit according to any one of claims 1 to 5, wherein the positive and negative half cycle states include a positive half cycle state and a negative half cycle state; the first bidirectional switch module comprises a first switch tube and a second switch tube; the first switching tube and the second switching tube are reversely connected in series between the first end and the second end of the first bidirectional switching module; the second bidirectional switch module comprises a third switch tube and a fourth switch tube; the third switching tube and the fourth switching tube are connected in reverse series between the first end and the second end of the second bidirectional switch module;
and controlling the on-off of the first bidirectional switch module and the second bidirectional switch module in the positive and negative half cycle states so that the alternating current conversion circuit is in an active mode or a follow current mode, wherein the alternating current conversion circuit comprises:
in the positive half-cycle state, the first switching tube and the third switching tube are controlled to be conducted through a preset duty ratio, and the second switching tube and the fourth switching tube are controlled to be continuously conducted; the first switching tube and the third switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the first switching tube is conducted and the third switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the first switching tube is turned off and the third switching tube is conducted;
In the negative half-cycle state, the second switching tube and the fourth switching tube are controlled to be conducted through a preset duty ratio, and the first switching tube and the third switching tube are controlled to be continuously conducted; the second switching tube and the fourth switching tube are opposite in conduction state, the alternating current conversion circuit is in an active mode when the second switching tube is conducted and the fourth switching tube is turned off, and the alternating current conversion circuit is in a follow current mode when the second switching tube is turned off and the fourth switching tube is conducted.
8. A controller comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 7 when the computer program is executed.
9. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 1 to 7.
10. An ac buck system, comprising an ac conversion circuit and the controller of claim 8.
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| CN101404458A (en) * | 2008-11-20 | 2009-04-08 | 北京金自天正智能控制股份有限公司 | Non-circular current control method for AC-AC frequency converter |
| CN104901528A (en) * | 2014-03-04 | 2015-09-09 | 乐星产电(无锡)有限公司 | Method and device for improving low-frequency wobble of motor |
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