CN114337199B - Drive control circuit, drive control method, circuit board and air conditioner - Google Patents
Drive control circuit, drive control method, circuit board and air conditioner Download PDFInfo
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- CN114337199B CN114337199B CN202011063283.6A CN202011063283A CN114337199B CN 114337199 B CN114337199 B CN 114337199B CN 202011063283 A CN202011063283 A CN 202011063283A CN 114337199 B CN114337199 B CN 114337199B
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Abstract
The invention discloses a drive control circuit, a drive control method, a circuit board and an air conditioner. The driving control circuit sends the same driving signals to two switching devices in the two-way switch by using a controller when the power parameter of the alternating current input end is smaller than a preset threshold value, so that crossover distortion is prevented; in addition, the controller is also utilized to send different driving signals to two switching devices in the bidirectional switch under the condition that the power parameter of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a driving control circuit, a driving control method, a circuit board, and an air conditioner.
Background
Currently, the bidirectional switch is widely applied to a rectifier of an alternating current power supply system, and the waveform phase of an input current and the waveform phase of an input voltage can be consistent by controlling the action of the bidirectional switch, so that the harmonic problem is improved. However, if the bidirectional switch adopts a synchronous conduction mode, a phenomenon that one of the switching devices in the bidirectional switch bears a larger voltage easily occurs, so that the bidirectional switch is damaged by overvoltage.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a drive control circuit, a drive control method, a circuit board and an air conditioner, which can prevent a bidirectional switch device from being damaged due to overvoltage.
In a first aspect, an embodiment of the present invention provides a drive control circuit, including:
the rectification module comprises a three-phase rectification bridge and a bidirectional switch assembly, wherein the three-phase rectification bridge comprises three bridge arms which are connected in parallel, the bidirectional switch assembly comprises three groups of bidirectional switches, each group of bidirectional switches is connected with the middle point of each bridge arm in a one-to-one correspondence manner, and each group of bidirectional switches comprises two switching devices which are connected in series;
The alternating current input end is used for receiving alternating current signals and is connected with the rectifying module;
the detection module is used for acquiring the electric power parameters of the alternating current input end and is connected with the alternating current input end;
the controller is used for sending the same driving signals to the two switching devices in the two-way switch when the power parameter of the alternating current input end is smaller than a preset threshold value; the controller is further configured to send different driving signals to two of the two switching devices and make a negative switching device of the two switching devices be in a PWM output state in at least half period of the ac signal when the power parameter of the ac input end is greater than or equal to the preset threshold, where the controller is connected to the two-way switching assembly and the detection module respectively.
The drive control circuit provided by the embodiment of the invention has at least the following beneficial effects: the controller is used for sending the same driving signals to two switching devices in the two-way switch when the power parameter of the alternating current input end is smaller than a preset threshold value, so that crossover distortion is prevented; in addition, the controller is also utilized to send different driving signals to two switching devices in the bidirectional switch under the condition that the power parameter of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In some embodiments of the invention, the drive control circuit further includes:
and the alternating current input end is connected with the rectifying module through the inductance device.
In the technical scheme, the inductance device is arranged between the alternating current input end and the rectification module, so that harmonic waves can be filtered, and the problem of the harmonic waves is further improved.
In some embodiments of the invention, the drive control circuit further includes:
the energy storage module is connected with the three-phase rectifier bridge in parallel, and comprises a first capacitor and a second capacitor which are connected in series, and each group of bidirectional switches are connected between the first capacitor and the second capacitor.
In the technical scheme, each group of bidirectional switches is connected between the first capacitor and the second capacitor, so that the voltage of the bidirectional switch assembly is clamped on half bus voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In a second aspect, an embodiment of the present invention further provides a driving control method applied to a driving control circuit, where the driving control circuit includes:
the rectification module comprises a three-phase rectification bridge and a bidirectional switch assembly, wherein the three-phase rectification bridge comprises three bridge arms which are connected in parallel, the bidirectional switch assembly comprises three groups of bidirectional switches, each group of bidirectional switches is connected with the middle point of each bridge arm in a one-to-one correspondence manner, and each group of bidirectional switches comprises a first switching device and a second switching device which are connected in series;
The alternating current input end is used for receiving alternating current signals and is connected with the rectifying module;
the detection module is used for acquiring the electric power parameters of the alternating current input end and is connected with the alternating current input end;
the controller is respectively connected with the bidirectional switch assembly and the detection module;
the drive control method includes:
acquiring the electric power parameters of the alternating current input end;
when the electric power parameter of the alternating current input end is smaller than a preset threshold value, the same driving signal is sent to two switching devices in the two-way switch;
and when the voltage value of the alternating current input end is larger than or equal to the preset threshold value, different driving signals are sent to two switching devices in the two-way switch, and negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal.
The driving control method provided by the embodiment of the invention has at least the following beneficial effects: transmitting the same driving signal to two switching devices in the two-way switch when the power parameter of the alternating current input end is smaller than a preset threshold value, so that crossover distortion is prevented; in addition, under the condition that the power parameter of the alternating current input end is larger than the preset threshold value, different driving signals are sent to two switching devices in the bidirectional switch, and negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In some embodiments of the present invention, the sending different driving signals to two of the switching devices in the bidirectional switch and placing a negative-going switching device in a PWM output state in at least half a period of the ac signal includes:
pulse signals are sent to two switching devices in the bidirectional switch to control the two switching devices to conduct complementarily in at least half period of the alternating current signal.
In the technical scheme, pulse signals are sent to two switching devices in the bidirectional switch to control the two switching devices to be complementarily conducted in at least half period of the alternating current signal, namely, when one switching device is in an off state, the other switching device is in an on state, so that the switching device in the on state is utilized to carry out voltage clamping on the switching device in the off state, and the bidirectional switch assembly is prevented from being damaged due to overvoltage; in addition, two switching devices in the bidirectional switch are controlled to be complementarily conducted, driving power is reduced, and heating value of the devices is reduced.
In some embodiments of the invention, said sending a pulse signal to two of said switching devices in said bi-directional switch to control complementary conduction of both of said switching devices during at least half of a cycle of said alternating current signal comprises:
In a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state or keep an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to switch between the on state and the off state;
in the other half period of the alternating current signal, pulse signals are sent to two switching devices in the bidirectional switch to control the two switching devices to conduct complementarily.
In the technical scheme, two switching devices are controlled to be complementarily conducted only in a half period, and negative switching devices in the two-way switch are controlled to be kept in a cut-off state in the other half period, so that the driving power is further reduced, and the heating value of the devices is reduced; and in the other half period, the negative switching device in the bidirectional switch is controlled to be kept in a conducting state, and when the switching device is reversely connected with the diode in parallel, the voltage drop generated by the diode can be avoided, and the voltage loss is reduced.
In some embodiments of the present invention, the sending different driving signals to two of the switching devices in the bidirectional switch and placing a negative-going switching device in a PWM output state in at least half a period of the ac signal includes:
And in at least half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to maintain an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to switch between the on state and the off state.
In the technical scheme, in at least half period of the alternating current signal, the negative switching device in the bidirectional switch is controlled to keep a conducting state, and the switching device in the conducting state can be utilized to clamp the voltage of the switching device in the off state, so that the bidirectional switch component is prevented from being damaged due to overvoltage.
In some embodiments of the invention, the controlling the negative switching device of the bidirectional switch to maintain the on state during at least half of the period of the ac signal, and sending a pulse signal to the positive switching device of the bidirectional switch to switch between the on state and the off state includes:
in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to be switched between an on state and an off state;
And in the other half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to maintain a conducting state, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between the conducting state and the off state.
In the technical scheme, the negative-direction switching device is controlled to keep a conducting state only in a half period, and the negative-direction switching device in the bidirectional switch is controlled to keep a cutting-off state in another period, so that the driving power is further reduced, and the heating value of the device is reduced.
In a third aspect, an embodiment of the present invention further provides a circuit board, including the driving control circuit in the first aspect. Therefore, the circuit board of the embodiment of the invention sends the same driving signals to the two switching devices in the two-way switch by using the controller when the power parameter of the alternating current input end is smaller than the preset threshold value, thereby preventing crossover distortion; in addition, the controller is also utilized to send different driving signals to two switching devices in the bidirectional switch under the condition that the power parameter of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In a fourth aspect, an embodiment of the present invention further provides an air conditioner, including the drive control circuit of the first aspect; alternatively, the system comprises at least one processor and a memory for communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method of the second aspect.
Therefore, in the air conditioner provided by the embodiment of the invention, the same driving signals are sent to the two switching devices in the two-way switch when the electric power parameter of the alternating current input end is smaller than the preset threshold value, so that crossover distortion is prevented; in addition, under the condition that the power parameter of the alternating current input end is larger than the preset threshold value, different driving signals are sent to two switching devices in the bidirectional switch, and negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to the second aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a driving waveform diagram of a bidirectional switch according to an embodiment of the present invention during synchronous driving;
FIG. 2 is a schematic circuit diagram of a drive control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of a driving control circuit;
fig. 4 is a driving waveform diagram of sending pulse signals to a first switching tube and a second switching tube to control the complementary conduction of the first switching tube and the second switching tube according to an embodiment of the present invention;
Fig. 5 is a driving waveform diagram (corresponding to the schematic circuit diagram of fig. 2) of a switching device which is complementarily turned on in a half period of an ac signal and is turned off in a negative direction in another half period of the ac signal according to an embodiment of the present invention;
fig. 6 is a driving waveform diagram (corresponding to the schematic circuit diagram of fig. 3) of a switching device which is complementarily turned on in a half period of an ac signal and is turned off in a negative direction in another half period of the ac signal according to an embodiment of the present invention;
FIG. 7 is a driving waveform diagram (corresponding to the schematic circuit diagram of FIG. 2) of a switching device which is complementarily turned on in one half period of an AC signal and is turned on in the other half period of the AC signal;
FIG. 8 is a driving waveform diagram (corresponding to the schematic circuit diagram of FIG. 3) of a switching device that is complementarily turned on in one half period of an AC signal and that is turned on in the other half period of the AC signal;
fig. 9 is a driving waveform diagram for controlling a negative switching device in a first switching tube and a second switching tube to maintain a conducting state, and sending a pulse signal to a positive switching device in the first switching tube and the second switching tube to switch between a conducting state and a cutting state;
Fig. 10 is a driving waveform diagram (corresponding to the schematic circuit diagram of fig. 2) of the embodiment of the present invention, in which the switching device in the negative direction is kept in the off state during the half period of the ac signal, and the switching device in the negative direction is kept in the on state during the other half period of the ac signal;
fig. 11 is a driving waveform diagram (corresponding to the schematic circuit diagram of fig. 3) of the embodiment of the present invention, in which the switching device in the negative direction is kept in the off state in the half period of the ac signal, and the switching device in the negative direction is kept in the on state in the other half period of the ac signal;
FIG. 12 is a flow chart of a drive control method provided by an embodiment of the present invention;
FIG. 13 is a flowchart showing a method for sending pulse signals to two switching devices in a bidirectional switch to control complementary conduction of the two switching devices according to an embodiment of the present invention;
FIG. 14 is a specific flowchart for controlling a negative switching device in a bidirectional switch to maintain an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between an on state and an off state according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be understood that in the description of the embodiments of the present invention, plural (or multiple) means two or more, and that greater than, less than, exceeding, etc. are understood to not include the present number, and that greater than, less than, within, etc. are understood to include the present number. If any, the terms "first," "second," etc. are used for distinguishing between technical features only, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Referring to fig. 1, in a driving waveform diagram of a bidirectional switch in synchronous driving, if the bidirectional switch adopts a synchronous conduction mode, a phenomenon that one of switching devices in the bidirectional switch bears a larger voltage easily occurs, so that the bidirectional switch is damaged by overvoltage.
Based on this, referring to fig. 2, an embodiment of the present invention provides a driving control circuit, including a rectifying module, an ac input end, a detecting module (not shown in the drawing), an energy storage module 202, a dc output end 203, a controller (not shown in the drawing), and a load, where the load may be a compressor module, and the rectifying module includes a three-phase rectifying bridge 201 and a two-way switch assembly, where the three-phase rectifying bridge 201 includes three parallel bridge arms, the two-way switch assembly includes three sets of two-way switches, each set of two-way switches is connected to a midpoint of each bridge arm in a one-to-one correspondence manner, and each set of two-way switches includes two switching devices connected in series with each other, specifically, the three-phase rectifying bridge 201 includes a first bridge arm 2011, a second bridge arm 2012, and a third bridge arm 2013 connected in parallel with each other; the bidirectional switch assembly comprises a first bidirectional switch 2014, a second bidirectional switch 2015 and a third bidirectional switch 2016, wherein one end of the first bidirectional switch 2014 is connected with the midpoint of the first bridge arm 2011, one end of the second bidirectional switch 2015 is connected with the midpoint of the second bridge arm 2012, and one end of the third bidirectional switch 2016 is connected with the midpoint of the third bridge arm 2013; the detection module is used for acquiring the power parameters of the alternating current input end and is connected with the alternating current input end; the energy storage module 202 includes a first capacitor C1 and a second capacitor C2 connected in series, and the other end of the first bidirectional switch 2014, the other end of the second bidirectional switch 2015, and the other end of the third bidirectional switch 2016 are all connected between the first capacitor C1 and the second capacitor C2. The alternating current input end is connected with the rectifying module, the direct current output end 203 is connected with the energy storage module 202, and the compressor module is connected with the direct current output end 203.
It will be appreciated that the ac input terminal includes a first phase input terminal 2041, a second phase input terminal 2042, and a third phase input terminal 2043, the first bridge arm 2011 includes a first diode D1 and a second diode D2 connected in series, the second bridge arm 2012 includes a third diode D3 and a fourth diode D4 connected in series, the third bridge arm 2013 includes a fifth diode D5 and a sixth diode D6 connected in series, and one end of the first bidirectional switch 2014 is connected to a midpoint of the first bridge arm 2011, that is, one end of the first bidirectional switch 2014 is connected between the first diode D1 and the second diode D2; one end of the second bidirectional switch 2015 is connected to the midpoint of the second bridge arm 2012, i.e., one end of the second bidirectional switch 2015 is connected between the third diode D3 and the fourth diode D4; one end of the third bidirectional switch 2016 is connected to the midpoint of the third bridge arm 2013, that is, one end of the third bidirectional switch 2016 is connected between the fifth diode D5 and the sixth diode D6; one end of the first bi-directional switch 2014 is connected between the first diode D1 and the second diode D2, one end of the second bi-directional switch 2015 is connected between the third diode D3 and the fourth diode D4, and one end of the third bi-directional switch 2016 is connected between the fifth diode D5 and the sixth diode D6. The ac input end is used for accessing three-phase mains supply, that is, the first phase input end 2041, the second phase input end 2042 and the third phase input end 2043 are correspondingly accessed to A, B, C three-phase mains supply, the first capacitor C1 and the second capacitor C2 are electrolytic capacitors, the positive electrode of the first capacitor C1 is respectively connected with the negative electrodes of the first diode D1, the third diode D3 and the fifth diode D5, the negative electrode of the second capacitor C2 is respectively connected with the negative electrodes of the second diode D2, the fourth diode D4 and the sixth diode D6, the three-phase mains supply is rectified by the rectifying module and then outputs a dc signal to be supplied to the compressor module, the dc output end 203 can be the positive electrode of the first capacitor C1, the common end of the first capacitor C1 and the second capacitor C2, the negative electrode of the second capacitor C2, the common end of the first capacitor C1 and the second capacitor C2 can be connected with a zero line or not be connected with the zero line, depending on actual requirements. The compressor module includes a compressor and a first intelligent power IPM module, and a dc electrical signal output by the dc output terminal 203 supplies power to the compressor through the first IPM module. It is understood that the number of compressor modules may be one or more.
It is appreciated that the first bidirectional switch 2014, the second bidirectional switch 2015, and the third bidirectional switch 2016 may comprise two switching tubes, wherein the first bidirectional switch 2014 comprises a first switching tube T1 and a second switching tube T2, wherein collectors of the first switching tube T1 and the second switching tube T2 are connected, an emitter of the first switching tube T1 is connected to a common terminal of the first diode D1 and the second diode D2, and an emitter of the second switching tube T2 is connected to a common terminal of the first capacitor C1 and the second capacitor C2. It can be understood that referring to fig. 3, the collector and emitter of the first switching tube T1 and the second switching tube T2 may be connected, the collector of the first switching tube T1 is connected to the common terminal of the first diode D1 and the second diode D2, and the collector of the second switching tube T2 is connected to the common terminal of the first capacitor C1 and the second capacitor C2. The first bidirectional switch 2014 may be an insulated gate bipolar transistor IGBT, an integrated gate commutated thyristor IGCT, a metal oxide semiconductor field effect transistor MOSFET, or the like, and it is understood that when the first bidirectional switch 2014 is a MOSFET, the emitters of the first switch tube T1 and the second switch tube T2 are connected, that is, the sources of the first switch tube T1 and the second switch tube T2 are correspondingly connected. Or, the collectors of the first switching tube T1 and the second switching tube T2 are connected, namely the drains of the first switching tube T1 and the second switching tube T2 are correspondingly connected. In addition, the first bidirectional switch 2014 may be implemented by using a reverse-resistance type switching tube in parallel.
The second bidirectional switch 2015 includes a third switching tube T3 and a fourth switching tube T4, where the collectors of the third switching tube T3 and the fourth switching tube T4 are connected, the emitter of the third switching tube T3 is connected to the common terminal of the third diode D3 and the fourth diode D4, and the emitter of the fourth switching tube T4 is connected to the common terminal of the first capacitor C1 and the second capacitor C2. It may be understood that the emitters of the third switching tube T3 and the fourth switching tube T4 may be connected, the collector of the third switching tube T3 is connected to the common terminal of the third diode D3 and the fourth diode D4, and the collector of the fourth switching tube T4 is connected to the common terminal of the first capacitor C1 and the second capacitor C2. Wherein, the second bidirectional switch 2015 may be an insulated gate bipolar transistor IGBT, an integrated gate commutated thyristor IGCT, a metal oxide semiconductor field effect transistor MOSFET, or the like, and it is understood that when the second bidirectional switch 2015 is a MOSFET, the emitters of the third switch tube T3 and the fourth switch tube T4 are connected, that is, the sources of the third switch tube T3 and the fourth switch tube T4 are correspondingly connected. Or, the collectors of the third switching tube T3 and the fourth switching tube T4 are connected, namely the drains of the third switching tube T3 and the fourth switching tube T4 are correspondingly connected. In addition, the second bidirectional switch 2015 may also be implemented by using a reverse-blocking switch tube in parallel.
The third bidirectional switch 2016 includes a fifth switching tube T5 and a sixth switching tube T6, where the collectors of the fifth switching tube T5 and the sixth switching tube T6 are connected, the emitter of the fifth switching tube T5 is connected to the common terminal of the fifth diode D5 and the sixth diode D6, and the emitter of the sixth switching tube T6 is connected to the common terminal of the first capacitor C1 and the second capacitor C2. It can be understood that the emitters of the fifth switching tube T5 and the sixth switching tube T6 may be connected, the collector of the fifth switching tube T5 is connected to the common terminal of the fifth diode D5 and the sixth diode D6, and the collector of the sixth switching tube T6 is connected to the common terminal of the first capacitor C1 and the second capacitor C2. The third bidirectional switch 2016 may be an insulated gate bipolar transistor IGBT, an integrated gate commutated thyristor IGCT, a metal oxide semiconductor field effect transistor MOSFET, or the like, and it is understood that when the third bidirectional switch 2016 is a MOSFET, the emitters of the fifth switch tube T5 and the sixth switch tube T6 are connected, that is, the sources of the fifth switch tube T5 and the sixth switch tube T6 are correspondingly connected. Alternatively, the collectors of the fifth switching tube T5 and the sixth switching tube T6 are connected, i.e. the drains of the fifth switching tube T5 and the sixth switching tube T6 are connected accordingly. The third bidirectional switch 2016 may be implemented in parallel using a reverse-blocking type switching transistor.
The first switching tube T1, the second switching tube T2, the third switching tube T3, the fourth switching tube T4, the fifth switching tube T5, and the sixth switching tube T6 are all antiparallel with diodes.
It can be appreciated that the ac input is connected to the rectifying module through the inductor 205, and the inductor 205 is disposed between the ac input and the rectifying module, so as to facilitate filtering out the harmonic wave and further improve the harmonic problem. Specifically, the inductor device 205 includes a first inductor L1, a second inductor L2, and a third inductor L3, where the first inductor L1 is connected to the first phase input terminal 2041, the second inductor L2 is connected to the second phase input terminal 2042, and the third inductor L3 is connected to the third phase input terminal 2043.
It can be understood that the above-mentioned power parameter may be one of a voltage value, a current value, or a voltage phase value, where the voltage value may be a phase voltage value or a line voltage value, and the voltage phase value may be an angle value between a comprehensive vector of the input voltage and a certain phase coordinate. The detection module can adopt a voltage sensor or a voltage sampling circuit, the voltage value or the current value detected by the detection module can be sent to the controller, and the controller sends corresponding control pulse signals to the bidirectional switch assembly after processing so as to control the action of each switch tube in the bidirectional switch assembly. When the voltage values of the first phase input end 2041, the second phase input end 2042 and the third phase input end 2043 are sampled by the detection module, only the voltage values of any two ends of the first phase input end 2041, the second phase input end 2042 and the third phase input end 2043 can be sampled, and the voltage value of the third end can be obtained by the voltage values of any two ends, so that one voltage sensor can be saved, and the circuit cost can be reduced. Specifically, the voltage value of the remaining end may be obtained by inverting the sum of the voltage values of any two ends of the first phase input terminal 2041, the second phase input terminal 2042, and the third phase input terminal 2043 based on the principle that the vector sum of the voltage values of the first phase input terminal 2041, the second phase input terminal 2042, and the third phase input terminal 2043 is zero.
It will be appreciated that when the current value at the ac input is used as a criterion, the detection module may be a current sensor or a current sampling circuit, respectively. Similarly, when the current values of the first phase input terminal 2041, the second phase input terminal 2042, and the third phase input terminal 2043 are sampled by the detection module, only the current values of any two of the first phase input terminal 2041, the second phase input terminal 2042, and the third phase input terminal 2043 can be sampled, and the current value of the third phase input terminal can be used for saving one current sensor, thereby reducing the circuit cost. Specifically, the current value of the remaining end may be obtained by inverting the sum of the current values of any two ends of the first phase input end 2041, the second phase input end 2042, and the third phase input end 2043 based on the principle that the vector sum of the current values of the first phase input end 2041, the second phase input end 2042, and the third phase input end 2043 is zero.
The principle that the power parameter is a current value or a voltage phase value is similar to the description below taking the power parameter as a voltage value as an example.
The controller is used for sending the same driving signals to two switching devices in the two-way switch when the voltage value of the alternating current input end is smaller than a preset threshold value; the controller is also used for sending different driving signals to two switching devices in the bidirectional switch and enabling negative switching devices in the two switching devices to be in a PWM output state in at least half period of the alternating current signal when the voltage value of the alternating current input end is larger than a preset threshold value, and the controller is respectively connected with the bidirectional switch component and the detection module. The controller is used for sending the same driving signals to two switching devices in the two-way switch when the voltage value of the alternating current input end is smaller than a preset threshold value, so that crossover distortion is prevented; in addition, the controller is used for sending different driving signals to the two switching devices in the bidirectional switch when the voltage value of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
The PWM output state, i.e. the switching device receives a pulse signal with a certain duty cycle, and it can be understood that the on state is a special PWM output state, and the duty cycle is 100%.
It can be understood that the above preset threshold may be set according to practical situations, and the embodiment of the present invention is not limited.
The following describes the working principle of the embodiment of the present invention by taking the first bidirectional switch 2014 as an example, correspondingly, the power parameter is the voltage value of the first phase input end (i.e. the a-phase voltage value), and in the state that the voltage value of the ac input end is greater than the preset threshold value, different driving signals are sent to two switching devices in the bidirectional switch, and the negative switching device in the two switching devices is in the PWM output state in at least half period of the ac signal, which may be the following cases:
referring to fig. 4, a case is that pulse signals are transmitted to the first switching tube T1 and the second switching tube T2 to control the first switching tube T1 and the second switching tube T2 to be complementarily turned on, that is, when the first switching tube T1 is in an off state, the second switching tube T2 is in an on state; when the second switching tube T2 is in an off state, the first switching tube T1 is in an on state, so that the switching device in the off state is subjected to voltage clamping by using the switching device in the on state, and the first bidirectional switch 2014 is prevented from being damaged due to overvoltage; in addition, the first switching tube T1 and the second switching tube T2 are controlled to be complementarily conducted, full-period control on the first switching tube T1 or the second switching tube T2 is not needed, driving power is reduced, and heating value of a device is reduced.
It will be appreciated that, referring to fig. 5 to 6, pulse signals may be transmitted to the first and second switching transistors T1 and T2 only during a half period of the ac signal to control the first and second switching transistors T1 and T2 to be complementarily turned on, and in the other half period of the ac signal, switching devices of the first and second switching transistors T1 and T2 of which negative directions are controlled to maintain an off state, and pulse signals may be transmitted to switching devices of the first and second switching transistors T1 and T2 of which positive directions are switched between an on state and an off state; illustratively, based on the schematic circuit diagram shown in fig. 2, in the positive half cycle of the ac signal, the negative-going switching device is the first switching tube T1; on the other hand, based on the schematic circuit diagram shown in fig. 3, in the negative half cycle of the ac signal, the negative switching device is the first switching transistor T1. Based on the schematic circuit diagram shown in fig. 2 or fig. 3, since the second switching tube T2 is a switching device close to the dc side, the risk of overvoltage is low, so when the second switching tube T2 is used as the main switching tube, the first switching tube T1 may not be controlled, only two switching devices are controlled to be complementarily turned on in a half period, and the negative switching device in the bidirectional switch is controlled to be kept in a turned-off state in the other half period, which is beneficial to further reducing the driving power and reducing the heating value of the devices.
It should be understood that the driving control principle of the embodiment of the present invention is described above by taking the first bi-directional switch 2014 as an example, and the driving control principle of the second bi-directional switch 2015 and the third bi-directional switch 2016 are identical to those of the first bi-directional switch 2014, which will not be described herein.
It will be understood that, referring to fig. 7 to 8, pulse signals may be sent to the first switching tube T1 and the second switching tube T2 only in a half period of the ac signal to control the first switching tube T1 and the second switching tube T2 to be complementarily turned on, and in the other half period of the ac signal, switching devices of the first switching tube T1 and the second switching tube T2 in a negative direction may also be controlled to maintain a turned-on state, and pulse signals may be sent to switching devices of the first switching tube T1 and the second switching tube T2 in a positive direction to switch between a turned-on state and a turned-off state; illustratively, based on the schematic circuit diagram shown in fig. 2, in the positive half cycle of the ac signal, the negative-going switching device is the first switching tube T1; on the other hand, based on the schematic circuit diagram shown in fig. 3, in the negative half cycle of the ac signal, the negative switching device is the first switching transistor T1. And in the other half period, the negative switching device in the bidirectional switch is controlled to keep a conducting state, and when the switching device is connected with the diode in anti-parallel, the voltage drop generated by the diode can be avoided, and the voltage loss is reduced. The control mode can be suitable for the condition that the first switching tube T1 and the second switching tube T2 are MOS tubes, and can achieve the effect of synchronous rectification when the first switching tube T1 and the second switching tube T2 are MOS tubes.
Referring to fig. 9, another case is to control the negative switching devices of the first and second switching tubes T1 and T2 to maintain the on state, and to transmit a pulse signal to the positive switching devices of the first and second switching tubes T1 and T2 to switch between the on state and the off state. The negative-direction switching devices in the first switching tube T1 and the second switching tube T2 are controlled to keep a conducting state, and the switching devices in the conducting state can be utilized to clamp the voltage of the switching devices in the cutting-off state, so that the damage of the bidirectional switching assembly due to overvoltage is avoided. For example, based on the schematic circuit diagram shown in fig. 2, the negative switching device is the first switching transistor T1 in the positive half cycle of the ac signal, and the negative switching device is the second switching transistor T2 in the negative half cycle of the ac signal.
As can be appreciated, referring to fig. 10 to 11, in a half cycle of the ac signal, the negative switching devices of the first switching tube T1 and the second switching tube T2 may be controlled to maintain the off state, and the pulse signal may be sent to the positive switching devices of the first switching tube T1 and the second switching tube T2 to switch between the on state and the off state; in the other half period of the alternating current signal, negative switching devices in the first switching tube T1 and the second switching tube T2 are controlled to keep on, and pulse signals are sent to positive switching devices in the first switching tube T1 and the second switching tube T2 to enable the positive switching devices to switch between on states and off states. Illustratively, based on the schematic circuit diagram shown in fig. 2, in the positive half cycle of the ac signal, the negative-going switching device is the first switching tube T1; on the other hand, based on the schematic circuit diagram shown in fig. 3, in the negative half cycle of the ac signal, the negative switching device is the first switching transistor T1. Based on the schematic circuit diagram shown in fig. 2 or fig. 3, since the second switching tube T2 is a switching device close to the dc side, the risk of overvoltage is low, so when the second switching tube T2 is used as the main switching tube, the first switching tube T1 may not be controlled, only the switching device with negative direction is controlled to maintain the on state in a half period, and the switching device with negative direction is controlled to maintain the off state in another period, which is beneficial to further reducing the driving power and reducing the heating value of the device.
It should be noted that, in a state where the voltage value at the ac input terminal is smaller than the preset threshold value, the duty ratio of the driving signal sent to the first bidirectional switch 2014 may be set according to the actual situation, and similarly, the duty ratio of the pulse signal sent to the forward switching devices in the first switching tube T1 and the second switching tube T2 may be set according to the actual situation, for example, the instantaneous value of the input voltage, the load situation, etc. may be comprehensively considered, which is only illustrative and not limited by the embodiment of the present invention.
It can be understood that the driving control circuit provided by the embodiment of the invention can be applied to an air conditioner, and an exemplary load can be a compressor of the air conditioner, the driving signal is sent to three groups of bidirectional switches to control the action of the driving signal, a direct current signal is output at the direct current output end 203 to be supplied to the compressor, and the same driving signal is sent to two switching devices in the bidirectional switches when the voltage value of the alternating current input end is smaller than a preset threshold value, so that crossover distortion is prevented; in addition, the controller is used for sending different driving signals to the two switching devices in the bidirectional switch when the voltage value of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
Referring to fig. 12, the embodiment of the present invention further provides a driving control method, which is exemplarily applied to the driving control circuit shown in fig. 2 or fig. 3, and the driving control method specifically includes, but is not limited to, the following steps 1201 to 1204:
step 1201: acquiring a voltage value of an alternating current input end;
step 1202: judging whether the voltage value of the alternating current input end is smaller than a preset threshold value, if yes, jumping to the step 1203; otherwise, step 1204 is skipped;
step 1203: transmitting the same driving signal to two switching devices in the bidirectional switch;
step 1204: different drive signals are sent to two switching devices in the bidirectional switch and the negative switching device in the two switching devices is in a PWM output state in at least half a period of the alternating current signal.
In the steps 1201 to 1204, the same driving signal is sent to the two switching devices in the bidirectional switch when the voltage value of the ac input terminal is smaller than the preset threshold value, so as to prevent crossover distortion; in addition, under the state that the voltage value of the alternating current input end is larger than a preset threshold value, different driving signals are sent to two switching devices in the bidirectional switch, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
The two switching devices in the bidirectional switch may be the first switching tube and the second switching tube in fig. 2 or fig. 3, or may be the third switching tube and the fourth switching tube, or may be the fifth switching tube and the sixth switching tube, and the specific principle is explained in the driving control circuit and will not be repeated here.
It can be appreciated that in the step 1204, different driving signals are sent to two switching devices in the bidirectional switch, and the negative switching device in the two switching devices is in a PWM output state during at least half period of the ac signal, which may specifically be: pulse signals are sent to two switching devices in the bidirectional switch to control the two switching devices to conduct complementarily in at least half a period of the alternating current signal.
The two switching devices in the bidirectional switch are sent with pulse signals to control the two switching devices to be complementarily conducted in at least half period of the alternating current signal, namely, when one switching device is in an off state, the other switching device is in an on state, so that the switching device in the on state is utilized to clamp the voltage of the switching device in the off state, and the bidirectional switch assembly is prevented from being damaged due to overvoltage; in addition, two switching devices in the bidirectional switch are controlled to be complementarily conducted, driving power is reduced, and heating value of the devices is reduced.
It will be appreciated that, referring to fig. 13, the above-mentioned transmission of pulse signals to two switching devices in the bidirectional switch to control the two switching devices to be complementarily turned on in at least half period of the ac signal may specifically include the following steps 1301 to 1302:
step 1301: in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state or keep an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to be switched between the on state and the off state;
step 1302: in the other half period of the alternating current signal, pulse signals are sent to two switching devices in the bidirectional switch to control the two switching devices to conduct complementarily.
In the step 1301, in the half period of the ac signal, there are two ways to control the negative switching device in the bidirectional switch, one is to keep the off state, and the other is to keep the on state, and the specific principle is that the above embodiment of the driving control circuit has been described, which is not described herein again.
In the steps 1301 to 1302, only two switching devices are controlled to be complementarily turned on in a half period, and negative switching devices in the bidirectional switch are controlled to be kept in a turned-off state in the other half period, so that the driving power is further reduced, and the heating value of the devices is reduced; and in the other half period, the negative switching device in the bidirectional switch is controlled to be kept in a conducting state, and when the switching device is reversely connected with the diode in parallel, the voltage drop generated by the diode can be avoided, and the voltage loss is reduced.
It will be appreciated that in the step 1204, different driving signals are sent to two switching devices in the bidirectional switch and the negative switching device in the two switching devices is in the PWM output state during at least half period of the ac signal, and in addition to sending pulse signals to the two switching devices in the bidirectional switch to control the two switching devices to be turned on complementarily, the method may also be that: and controlling a negative switching device in the bidirectional switch to maintain an on state in at least half period of the alternating current signal, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between the on state and the off state.
The on state is kept to be a special PWM output state, and in at least half period of the alternating current signal, a negative switching device in the bidirectional switch is controlled to be kept in the on state, so that the switching device in the off state can be subjected to voltage clamping by using the switching device in the on state, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
It will be appreciated that referring to fig. 14, the above-mentioned control of the negative switching device in the bidirectional switch to maintain the on state, and the pulse signal to the positive switching device in the bidirectional switch to switch between the on state and the off state may specifically include the following steps 1401 to 1402:
Step 1401: in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to be switched between an on state and an off state;
step 1402: in the other half period of the alternating current signal, a negative switching device in the bidirectional switch is controlled to maintain an on state, and a pulse signal is sent to a positive switching device in the bidirectional switch to switch between the on state and the off state.
In the steps 1401 to 1402, the negative switching device is controlled to be kept on only in one half period, and the negative switching device is controlled to be kept off in the other half period, which is beneficial to further reducing the driving power and reducing the heating value of the device. The specific principle is described in the above driving control circuit embodiment, and will not be described herein.
In addition, the embodiment of the invention also provides a circuit board which comprises the drive control circuit in the embodiment. Therefore, the circuit board of the embodiment of the invention sends the same driving signals to the two switching devices in the two-way switch by using the controller when the voltage value of the alternating current input end is smaller than the preset threshold value, thereby preventing crossover distortion; in addition, the controller is used for sending different driving signals to the two switching devices in the bidirectional switch when the voltage value of the alternating current input end is larger than the preset threshold value, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
In addition, the embodiment of the invention also provides an air conditioner, which comprises the drive control circuit in the embodiment. Therefore, in the air conditioner provided by the embodiment of the invention, the same driving signals are sent to the two switching devices in the two-way switch when the voltage value of the alternating current input end is smaller than the preset threshold value, so that crossover distortion is prevented; in addition, under the state that the voltage value of the alternating current input end is larger than a preset threshold value, different driving signals are sent to two switching devices in the bidirectional switch, and the negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal, so that the voltage clamping effect can be achieved, one switching device in the bidirectional switch is prevented from bearing larger voltage, and the bidirectional switch assembly is prevented from being damaged due to overvoltage.
It should also be appreciated that the various embodiments provided by the embodiments of the present invention may be arbitrarily combined to achieve different technical effects.
Fig. 15 shows an air conditioner 1500 provided by an embodiment of the present invention. The air conditioner 1500 includes: the apparatus includes a memory 1501, a processor 1502, and a computer program stored in the memory 1501 and executable on the processor 1502, the computer program being operable to perform the drive control method described above.
The processor 1502 and the memory 1501 may be connected by a bus or other means.
The memory 1501 serves as a non-transitory computer readable storage medium storing a non-transitory software program and a non-transitory computer executable program, such as a drive control method described in the embodiments of the present invention. The processor 1502 implements the drive control method described above by running a non-transitory software program and instructions stored in the memory 1501.
The memory 1501 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store a drive control method as described above. Furthermore, the memory 1501 may include a high-speed random access memory 1501, and may also include a non-transitory memory 1501, such as at least one storage device memory 1501, a flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 1501 may optionally include a memory 1501 located remotely from the processor 1502, the remote memory 1501 being connectable to the air conditioner 1500 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
A non-transitory software program and instructions required to implement the drive control method described above are stored in the memory 1501, which when executed by the one or more processors 1502, perform the drive control method described above, for example, method steps 1201-1204 in fig. 12, method steps 1301-1302 in fig. 13, and method steps 1401-1402 in fig. 14.
The embodiment of the invention also provides a computer readable storage medium which stores computer executable instructions for executing the drive control method.
It will be appreciated that the computer-readable storage medium stores computer-executable instructions that are executed by one or more control processors, for example, by one of the processors 1502 in the air conditioner 1500, which may cause the processor 1502 to perform the drive control method described above, for example, performing the method steps 1201-1204 in fig. 12, the method steps 1301-1302 in fig. 13, and the method steps 1401-1402 in fig. 14.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, storage device storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and may include any information delivery media.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (8)
1. A drive control circuit, characterized by comprising:
the rectification module comprises a three-phase rectification bridge and a bidirectional switch assembly, wherein the three-phase rectification bridge comprises three bridge arms which are connected in parallel, the bidirectional switch assembly comprises three groups of bidirectional switches, each group of bidirectional switches is connected with the middle point of each bridge arm in a one-to-one correspondence manner, and each group of bidirectional switches comprises two switching devices which are connected in series;
the alternating current input end is used for receiving alternating current signals and is connected with the rectifying module;
the detection module is used for acquiring the electric power parameters of the alternating current input end and is connected with the alternating current input end;
the controller is used for sending the same driving signals to the two switching devices in the two-way switch when the power parameter of the alternating current input end is smaller than a preset threshold value; the controller is further configured to send different driving signals to two switching devices in the bidirectional switch and make negative switching devices in the two switching devices be in a PWM output state in at least half period of the ac signal when the power parameter of the ac input end is greater than or equal to the preset threshold value, where the controller is connected to the bidirectional switch assembly and the detection module respectively;
The sending different driving signals to the two switching devices in the bidirectional switch and enabling the negative switching device in the two switching devices to be in a PWM output state in at least half period of the alternating current signal comprises the following steps:
in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state or keep an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to switch between the on state and the off state; transmitting pulse signals to two switching devices in the bidirectional switch in the other half period of the alternating current signal so as to control the two switching devices to conduct complementarily;
or in at least half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to maintain an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between the on state and the off state.
2. The drive control circuit according to claim 1, characterized in that the drive control circuit further comprises:
the energy storage module is connected with the three-phase rectifier bridge in parallel, and comprises a first capacitor and a second capacitor which are connected in series, and each group of bidirectional switches are connected between the first capacitor and the second capacitor.
3. The drive control circuit according to claim 1, characterized in that the drive control circuit further comprises:
and the alternating current input end is connected with the rectifying module through the inductance device.
4. A drive control method, characterized by being applied to a drive control circuit comprising:
the rectification module comprises a three-phase rectification bridge and a bidirectional switch assembly, wherein the three-phase rectification bridge comprises three bridge arms which are connected in parallel, the bidirectional switch assembly comprises three groups of bidirectional switches, each group of bidirectional switches is connected with the middle point of each bridge arm in a one-to-one correspondence manner, and each group of bidirectional switches comprises a first switching device and a second switching device which are connected in series;
the alternating current input end is used for receiving alternating current signals and is connected with the rectifying module;
the detection module is used for acquiring the electric power parameters of the alternating current input end and is connected with the alternating current input end;
the controller is respectively connected with the bidirectional switch assembly and the detection module;
the drive control method includes:
acquiring the electric power parameters of the alternating current input end;
When the electric power parameter of the alternating current input end is smaller than a preset threshold value, the same driving signal is sent to two switching devices in the two-way switch;
when the power parameter of the alternating current input end is larger than or equal to the preset threshold value, different driving signals are sent to two switching devices in the two-way switch, and negative switching devices in the two switching devices are in a PWM output state in at least half period of the alternating current signal;
the sending different driving signals to the two switching devices in the bidirectional switch and enabling the negative switching device in the two switching devices to be in a PWM output state in at least half period of the alternating current signal comprises the following steps:
in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state or keep an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to switch between the on state and the off state; transmitting pulse signals to two switching devices in the bidirectional switch in the other half period of the alternating current signal so as to control the two switching devices to conduct complementarily;
Or in at least half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to maintain an on state, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between the on state and the off state.
5. The drive control method according to claim 4, wherein the controlling the negative-going switching device of the bidirectional switch to be kept on and the pulse signal to the positive-going switching device of the bidirectional switch to be switched between the on state and the off state in at least half cycle of the alternating-current signal includes:
in a half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to keep an off state, and sending a pulse signal to a positive switching device in the bidirectional switch to enable the positive switching device to be switched between an on state and an off state;
and in the other half period of the alternating current signal, controlling a negative switching device in the bidirectional switch to maintain a conducting state, and sending a pulse signal to a positive switching device in the bidirectional switch to switch between the conducting state and the off state.
6. A circuit board, characterized in that: a drive control circuit comprising any one of claims 1 to 3.
7. An air conditioner, characterized in that: a drive control circuit comprising any one of claims 1 to 3; alternatively, the system comprises at least one processor and a memory for communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the drive control method of claim 4 or 5.
8. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the drive control method according to claim 4 or 5.
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