CN111262424A - Control method and device of half-bridge three-level direct current converter and computer equipment - Google Patents
Control method and device of half-bridge three-level direct current converter and computer equipment Download PDFInfo
- Publication number
- CN111262424A CN111262424A CN202010152476.2A CN202010152476A CN111262424A CN 111262424 A CN111262424 A CN 111262424A CN 202010152476 A CN202010152476 A CN 202010152476A CN 111262424 A CN111262424 A CN 111262424A
- Authority
- CN
- China
- Prior art keywords
- switching tube
- bridge
- tube
- switch
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
Abstract
The application relates to a control method and device of a half-bridge three-level direct current converter, computer equipment and a storage medium. The method comprises the following steps: receiving a shutdown instruction, wherein the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working; closing the second switching tube and the third switching tube according to the stop instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes. The method can ensure that the direct current bus voltage and the flying capacitor voltage are always kept the same when the half-bridge three-level direct current converter is stopped so as to prevent internal devices from being damaged when the half-bridge three-level direct current converter is restarted at any time.
Description
Technical Field
The present invention relates to the field of half-bridge three-level dc converter processing technologies, and in particular, to a method and an apparatus for controlling a half-bridge three-level dc converter, a computer device, and a storage medium.
Background
The half-bridge three-level DC converter has the advantages of low voltage stress of a switching tube, small size of a filter and the like, and is suitable for medium and high power DC conversion occasions with high input or output voltage. The half-bridge three-level direct current converter has the advantages of being small in number of switching tubes and having a three-level direct current/direct current (DC/DC) converter, becomes a research hotspot in recent years, and is widely applied to the fields of high-voltage direct current transmission, locomotive traction, electric automobiles and the like.
When the half-bridge three-level direct current converter stops working, the flying capacitor has a small capacitance value, and the stored electric energy can be quickly discharged through a parasitic resistor in the loop, so that the voltage at two ends of the flying capacitor is reduced to zero. However, the capacitance of the dc input side capacitor is large, and the stored electric energy cannot be discharged in a short time, so the bus voltage of the input side of the half-bridge three-level dc converter remains approximately constant. In this case, the bus voltage of the half-bridge three-level dc converter is different from the flying capacitor voltage. When the half-bridge three-level direct current converter is started up again, a larger current can pass through the clamping diode, so that the clamping diode is easy to damage due to overcurrent.
At present, aiming at the problem that the direct current bus voltage and the flying capacitor voltage are not equal when the half-bridge three-level direct current converter is shut down at home and abroad, the direct current bus capacitor on the input side is mainly discharged through an external resistor.
Disclosure of Invention
In view of the above, it is necessary to provide a control method, an apparatus, a computer device, and a storage medium for a half-bridge three-level dc converter, which can ensure that the dc bus voltage and the flying capacitor voltage are always the same when the half-bridge three-level dc converter is stopped, so that the half-bridge three-level dc converter does not damage internal devices when the half-bridge three-level dc converter is restarted at any time.
A method of controlling a half-bridge three-level dc converter, the method comprising: receiving a shutdown instruction, wherein the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working; closing the second switching tube and the third switching tube according to the stop instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
In one embodiment, the controlling the first switch tube and the fourth switch tube to conduct complementarily comprises: when the first switching tube is controlled to be conducted through the first signal, the fourth switching tube is closed; when the fourth switching tube is controlled to be conducted through the second signal, the first switching tube is closed; the first signal is 180 degrees out of phase with the second signal.
In one embodiment, the method for controlling a half-bridge three-level dc converter further includes: and after a preset time period, the first switching tube and the fourth switching tube are closed.
In one embodiment, the method for controlling a half-bridge three-level dc converter further includes: receiving a starting instruction, wherein the starting instruction is used for instructing the half-bridge three-level direct current converter to start and work; and controlling the complementary conduction of the second switching tube and the third switching tube and the complementary conduction of the first switching tube and the fourth switching tube.
In one embodiment, before the second switching tube and the third switching tube are closed according to the shutdown command, the method further comprises the following steps: and determining that the half-bridge three-level direct current converter is in a working state, and when the half-bridge three-level direct current converter is in the working state, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are in a complementary conduction state.
In one embodiment, the method for controlling a half-bridge three-level dc converter further includes: determining that the second switching tube and the third switching tube are conducted complementarily through a first driving signal and the first switching tube and the fourth switching tube are conducted complementarily through a second driving signal when the half-bridge three-level direct current converter is in a working state; control first switch tube and the complementary conduction of fourth switch tube, include: and controlling the first switching tube and the fourth switching tube to be conducted complementarily through a second driving signal.
A control apparatus for a half-bridge three-level dc converter, the apparatus comprising: the receiving module is used for receiving a shutdown instruction, and the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working; the control module is used for closing the second switching tube and the third switching tube according to the stop instruction and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
An electronic control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the above-described embodiments of the method when executing the computer program.
A dc conversion system comprising a half-bridge three-level dc converter and the electronic control device of the above embodiments.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any of the above embodiments.
According to the control method and device of the half-bridge three-level direct current converter, the computer equipment, the electronic control equipment and the storage medium, when the processor receives a stop instruction for instructing the half-bridge three-level direct current converter to stop working, the second switch tube and the third switch tube in the half-bridge three-level direct current converter are closed. Because the second switch tube and the third switch tube are one voltage output end of the inversion link of the half-bridge three-level direct current converter, when the second switch tube and the third switch tube in the half-bridge three-level direct current converter are closed, the output voltage of the inversion link of the half-bridge three-level direct current converter is zero, and at the moment, the half-bridge three-level direct current converter can stop working. Meanwhile, the processor controls the first switch tube and the fourth switch tube to be conducted complementarily, two voltage division capacitors on the side of a direct current bus in the half-bridge three-level direct current converter alternately charge the flying capacitor, loss of electric energy in the flying capacitor is supplemented, the direct current bus voltage is guaranteed to be the same as the flying capacitor voltage, and therefore the half-bridge three-level direct current converter cannot cause damage to internal devices when being restarted at any time.
Drawings
FIG. 1 is a schematic diagram of a topology of a half-bridge three-level DC converter in one embodiment;
FIG. 2 is a flow chart illustrating a method for controlling a half-bridge three-level DC converter according to an embodiment;
FIG. 3 is a waveform diagram of driving waveforms of switching tubes of a control method of a half-bridge three-level DC converter in one embodiment;
fig. 4 is a commutation diagram of the half-bridge three-level dc converter in an embodiment when the first switching transistor S1 is turned on and the other switching transistors are turned off;
fig. 5 is a commutation diagram of the half-bridge three-level dc converter in an embodiment when the fourth switching transistor S4 is turned on and the other switching transistors are turned off;
fig. 6 is an experimental waveform diagram of the dc bus voltage and the flying capacitor voltage when the half-bridge three-level dc converter control method of the present application is used for shutdown in an embodiment;
fig. 7 is an experimental waveform diagram of the dc bus voltage and the flying capacitor voltage after shutdown using the control method of the half-bridge three-level dc converter according to the present application in one embodiment;
fig. 8 is a voltage waveform diagram of two points Uab when shutdown is performed by using a control method of a half-bridge three-level dc converter according to the present application in an embodiment;
fig. 9 is an experimental waveform diagram of the dc bus voltage and the flying capacitor voltage at the time of restarting after shutdown by using the control method of the half-bridge three-level dc converter according to the present invention in one embodiment;
fig. 10 is an experimental waveform diagram of the dc bus voltage and the flying capacitor voltage after restarting after shutdown using the control method of the half-bridge three-level dc converter according to the present invention in one embodiment;
FIG. 11 is a waveform diagram illustrating driving waveforms of a switching tube of the half-bridge three-level DC converter in normal operation according to an embodiment;
FIG. 12 is a graph of voltage waveforms of the half-bridge three-level DC converter of one embodiment during normal operation;
fig. 13 is a block diagram of a control apparatus of a half-bridge three-level dc converter in an embodiment;
fig. 14 is an internal structural view of an electronic control device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a control method of a half-bridge three-level direct current converter, which is used for controlling the half-bridge three-level direct current converter. The half-bridge three-level direct current converter comprises a first direct current input end, a second direct current input end, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first voltage division capacitor, a second voltage division capacitor and a flying capacitor. The first voltage-dividing capacitor is connected with the second voltage-dividing capacitor in series, the first voltage-dividing capacitor is connected with the first direct current input end, and the second voltage-dividing capacitor is connected with the second direct current input end. The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are sequentially connected in series, the first switch tube is connected with the first direct current input end, and the fourth switch tube is connected with the second direct current input end. That is, the first switch tube and the fourth switch tube are outer switch tubes of the half-bridge three-level dc converter, and the second switch tube and the third switch tube are inner switch tubes of the half-bridge three-level dc converter. One end of the flying capacitor is connected with the first connecting end, and the other end of the flying capacitor is connected with the second connecting end. The first connection end is a connection end of the first switch tube and the second switch tube, the second connection end is a connection end of the third switch tube and the fourth switch tube, the third connection end is a connection end of the first voltage-dividing capacitor and the second voltage-dividing capacitor, and the fourth connection end is a connection end of the second switch tube and the third switch tube. And the voltage between two end points of the third connecting end and the fourth connecting end is the output voltage of an inversion link of the half-bridge three-level direct current converter.
Fig. 1 is a diagram of a half-bridge three-level dc converter topology. As shown in fig. 1, the first dc input terminal is a positive input terminal of the half-bridge three-level dc converter on the dc bus side, and the second dc input terminal is a negative input terminal of the half-bridge three-level dc converter on the dc bus side. The total dc bus voltage Vin is the voltage between the first dc input terminal and the second dc input terminal. The voltage division capacitors connected in series on the direct current side are a first voltage division capacitor Cin1 and a second voltage division capacitor Cin 2. The positive electrode of the first voltage-dividing capacitor Cin1 is connected with the positive electrode of the direct-current bus, the negative electrode of the first voltage-dividing capacitor Cin1 is connected with the positive electrode of the second voltage-dividing capacitor Cin2, and the midpoint of the first voltage-dividing capacitor Cin1 and the midpoint of the second voltage-dividing capacitor Cin2 is defined as B. And the negative electrode of the second voltage division capacitor Cin2 is connected with the negative electrode of the direct current bus. The control switch tube of the half-bridge three-level DC converter is formed by connecting 4 switch tubes end to end in series, namely a first switch tube S1, a second switch tube S2, a third switch tube S3 and a fourth switch tube S4. The collector of the first switch tube S1 is connected to the positive electrode of the dc bus, the emitter of the first switch tube S1 is connected to the collector of the second switch tube S2, the emitter of the second switch tube S2 is connected to the collector of the third switch tube S3, the emitter of the third switch tube S3 is connected to the collector of the fourth switch tube S4, and the emitter of the fourth switch tube S4 is connected to the negative electrode of the dc bus. The positive electrode of the flying capacitor Css is connected to the midpoint between the first switch tube S1 and the second switch tube S2, and the negative electrode of the flying capacitor Css is connected to the midpoint between the third switch tube S3 and the fourth switch tube S4. The clamp diode D1 is connected in series with the clamp diode D2, the midpoint of which is connected to the midpoint B of the half-bridge three-level dc converter, the cathode of the clamp diode D1 is connected to the anode of the flying capacitor Css, and the anode of the clamp diode D2 is connected to the cathode of the flying capacitor Css. And leading out a midpoint A of the second switching tube S2 and the third switching tube S3 and a midpoint B of the half-bridge three-level direct current converter as an output end voltage Uab of the half-bridge three-level direct current converter. One end of the resonance inductor Lr is connected with the point A, the other end of the resonance inductor Lr is connected with the transformer, one end of the primary side of the transformer is connected with the resonance inductor Lr, and the other end of the primary side of the transformer is connected with the point B. The secondary side of the transformer is a full-wave rectification structure, and will not be described in detail here.
When the half-bridge three-level direct current converter adopts a traditional shutdown mode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all in a turn-off state. When the shutdown mode is adopted, the flying capacitor has a small capacitance value, so that the stored electric energy is quickly discharged through a parasitic resistor of the loop, and the voltage at two ends of the flying capacitor is quickly reduced to zero. The capacitance value of the direct current side capacitor is larger, so that more capacitors are stored in the direct current side capacitor, and the voltage at two ends of the direct current side capacitor is reduced slowly. Thus, the flying capacitor voltage is no longer the same as the dc bus voltage.
In an embodiment, as shown in fig. 2, a method for controlling a half-bridge three-level dc converter is provided, which is described by taking an example of applying the method to the half-bridge three-level dc converter in fig. 1, and includes the following steps:
and S102, receiving a stop instruction, wherein the stop instruction is used for instructing the half-bridge three-level direct current converter to stop working.
S104, closing the second switching tube and the third switching tube according to the stop instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
In this embodiment, the electronic control device is used to implement a control method of a half-bridge three-level dc converter of the present application. And a processor of the electronic control equipment receives a stop command, and the stop command is used for instructing the half-bridge three-level direct current converter to stop working. The stop command may be a command generated after the electronic control device is manually operated, or may be a command automatically generated in the electronic control device. Further, the processor of the electronic control device closes the second switching tube and the third switching tube of the half-bridge three-level direct current converter according to the stop instruction, and controls the first switching tube and the fourth switching tube of the half-bridge three-level direct current converter to be conducted complementarily. The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
Specifically, two inner switching tubes (i.e., the second switching tube S2 and the third switching tube S3 shown in fig. 1) of the half-bridge three-level dc converter are shielded off, and two outer switching tubes (i.e., the first switching tube S1 and the fourth switching tube S4 shown in fig. 1) are complementarily turned on. By adopting the shutdown control strategy, the flying capacitor voltage and the direct current bus voltage are kept equal, so that the half-bridge three-level direct current converter can be ensured to be started for the second time at any time, the discharge speed of the first voltage-dividing capacitor Cin1 and the second voltage-dividing capacitor Cin2 which are connected in series on the direct current side can be accelerated by the shutdown control method, an additional discharge circuit does not need to be added to the half-bridge three-level direct current converter, and the material cost is saved and the safety factor of the half-bridge three-level direct current converter is improved.
According to the control method of the half-bridge three-level direct current converter, when the processor receives a stop command for instructing the half-bridge three-level direct current converter to stop working, the second switching tube and the third switching tube in the half-bridge three-level direct current converter are closed. Because the second switch tube and the third switch tube are one voltage output end of the inversion link of the half-bridge three-level direct current converter, when the second switch tube and the third switch tube in the half-bridge three-level direct current converter are closed, the output voltage of the inversion link of the half-bridge three-level direct current converter is zero, and at the moment, the half-bridge three-level direct current converter can stop working. Meanwhile, the processor controls the first switch tube and the fourth switch tube to be conducted complementarily, two voltage division capacitors on the side of a direct current bus in the half-bridge three-level direct current converter alternately charge the flying capacitor, loss of electric energy in the flying capacitor is supplemented, the direct current bus voltage is guaranteed to be the same as the flying capacitor voltage, and therefore the half-bridge three-level direct current converter cannot cause damage to internal devices when being restarted at any time.
In one embodiment, S104 includes: when the first switching tube is controlled to be conducted through the first signal, the fourth switching tube is closed; when the fourth switching tube is controlled to be conducted through the second signal, the first switching tube is closed; the first signal is 180 degrees out of phase with the second signal.
When the half-bridge three-level dc converter adopts the control method of the present application to perform shutdown control, the inner switch tube (the second switch tube S2 and the third switch tube S3) is turned off, and the outer switch tube (the first switch tube S1 and the fourth switch tube S4) is turned on complementarily, and the driving waveforms are as shown in fig. 3. Wherein, S1, S2, S3 and S4 in fig. 3 represent driving signal waveforms of the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4, respectively. As shown in fig. 3, the phase difference between the driving signal (first signal) corresponding to the first switch tube S1 and the driving signal (second signal) corresponding to the fourth switch tube S4 is 180 degrees. When the first switch tube S1 is turned on and the fourth switch tube S4 is turned off, the commutation loop of the half-bridge three-level dc converter is as shown in fig. 4. At this time, the flying capacitor Css is charged by the dc-side first voltage-dividing capacitor Cin 1. When the first switch tube S1 is turned off and the fourth switch tube S4 is turned on, the commutation loop of the half-bridge three-level dc converter is as shown in fig. 5. At the moment, the flying capacitor Css is charged by the direct-current second voltage-dividing capacitor Cin2, so that the voltage of the flying capacitor Css is equal to the voltage of the direct-current bus. When the half-bridge three-level direct current converter is stopped, the flying capacitor Css voltage is immediately charged to be equal to the direct current bus voltage from the original value of 1/2 direct current bus voltage, and the experimental waveform is shown in fig. 6. Then, the flying capacitor Css voltage and the dc bus voltage are reduced continuously but kept equal in magnitude due to the discharge loop, and the experimental waveforms are shown in fig. 7. The voltage waveforms at two points Uab when the half-bridge three-level dc converter is shut down by the control method of the present application are shown in fig. 8. Therefore, the direct current bus voltage and the flying capacitor voltage can be kept the same when the half-bridge three-level direct current converter is stopped, so that the half-bridge three-level direct current converter can not cause damage to internal devices when the half-bridge three-level direct current converter is restarted at any time.
In an embodiment, after S104, the method further includes: and after a preset time period, the first switching tube and the fourth switching tube are closed.
In this embodiment, after the electronic control device turns off the second switching tube and the third switching tube and controls the first switching tube and the fourth switching tube to conduct complementarily, the first switching tube and the fourth switching tube are turned off after a preset time period, and it is not necessary to provide driving signals for the first switching tube and the fourth switching tube all the time to control the complementary conduction of the first switching tube and the fourth switching tube, so that the electric quantity of the electronic control device can be saved.
In an embodiment, after S104, the method further includes: receiving a starting instruction, wherein the starting instruction is used for instructing the half-bridge three-level direct current converter to start and work; and controlling the complementary conduction of the second switching tube and the third switching tube and the complementary conduction of the first switching tube and the fourth switching tube.
In this embodiment, when the processor of the electronic control device receives the start instruction, the processor controls the second switching tube and the third switching tube to conduct complementarily, and controls the first switching tube and the fourth switching tube to conduct complementarily. Specifically, when the half-bridge three-level dc converter is turned on again, the flying capacitor Css voltage is immediately reduced to 1/2 equal to the dc bus voltage, and then the dc bus voltage equal to 1/2 is kept for charging, and the experimental waveform is shown in fig. 9. When the flying capacitor Css voltage is still equal to 1/2 dc bus after charging is complete, the experimental waveform is shown in fig. 10. Therefore, the direct current bus voltage and the flying capacitor voltage can be kept the same when the half-bridge three-level direct current converter is stopped, so that the half-bridge three-level direct current converter can not cause damage to internal devices when the half-bridge three-level direct current converter is restarted at any time.
In an embodiment, S104 further includes: and determining that the half-bridge three-level direct current converter is in a working state, and when the half-bridge three-level direct current converter is in the working state, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are in a complementary conduction state.
In this embodiment, after receiving the shutdown command, the processor of the electronic control device needs to determine whether the half-bridge three-level dc converter is in the operating state before closing the second switching tube and the third switching tube according to the shutdown command. When the half-bridge three-level direct current converter is in the working state, the second switching tube and the third switching tube are closed according to the stop command. Therefore, the damage of the half-bridge three-level direct current converter caused by the working failure of the processor of the electronic control equipment can be avoided.
In an embodiment, after determining that the half-bridge three-level dc converter is in the operating state, the method further includes: and determining that the second switching tube and the third switching tube are conducted complementarily through a first driving signal and the first switching tube and the fourth switching tube are conducted complementarily through a second driving signal when the half-bridge three-level direct current converter is in a working state. In this case, S104 includes: and controlling the first switching tube and the fourth switching tube to be conducted complementarily through a second driving signal.
In this embodiment, the switching state of the switching tube is defined as S1S2S3S4 when the half-bridge three-level dc converter is in the normal operation mode. The switching state when the switching tube Si is turned on is 1, the switching state when the switching tube Si is turned off is 0, and i is 1,2,3, and 4 are switching tube numbers. Therefore, there are 8 switching states, namely 1100-0100-0101-0011-0010-1010-1000-1100. The dead zone is not considered, and the operation can be simplified to 1100-0101-0011-1010. By means of this switching state, the drive signal of the half-bridge three-level dc converter can be obtained, as shown in fig. 11. Wherein, S1, S2, S3 and S4 in fig. 11 represent driving signal waveforms of the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4, respectively. The processor of the electronic control device controls the second switching tube and the third switching tube to be conducted complementarily and controls the first switching tube and the fourth switching tube to be conducted complementarily according to the driving signals given by the diagram in fig. 11. The first driving signal includes a driving signal corresponding to S1 in fig. 11 and a driving signal corresponding to S4, and the second driving signal includes a driving signal corresponding to S2 in fig. 11 and a driving signal corresponding to S3. When the half-bridge three-level direct current converter works normally, the voltage of the flying capacitor Css is equal to half of the voltage of the direct current bus. When the half-bridge three-level direct current normally works, the voltage waveforms at two points Uab are as shown in fig. 12. At this time, when the processor of the electronic control device closes the second switching tube and the third switching tube according to the stop instruction, the second driving signal is continuously adopted to control the first switching tube and the fourth switching tube to carry out complementary conduction. Therefore, complementary conduction of the first switching tube and the fourth switching tube can be realized without adding driving signals to the first switching tube and the fourth switching tube, and the control flow of the half-bridge three-level direct current converter is simplified.
For the control method of the half-bridge three-level dc converter, a specific implementation scenario is given as follows:
step 1: when the half-bridge three-level direct current converter works normally, the inner switch tube (the second switch tube S2 and the third switch tube S3) is conducted complementarily, and the outer switch tube (the first switch tube S1 and the fourth switch tube S4) is conducted complementarily. The flying capacitor Css voltage is equal to 1/2 dc bus voltage.
Step 2: the inner switching tube (the second switching tube S2 and the third switching tube S3) of the half-bridge three-level dc converter is turned off, the output voltage Vab of the half-bridge three-level inverter link is zero, and the half-bridge three-level dc converter has no voltage output, so that the shutdown effect is achieved.
And step 3: the outer switch tubes (the first switch tube S1 and the fourth switch tube S4) of the half-bridge three-level direct current converter are conducted in a complementary mode, at the moment, the direct current side capacitor is connected with the flying capacitor Css, electric energy in the direct current side capacitor can supplement the loss of the electric energy in the flying capacitor Css, therefore, the voltage of the direct current side capacitor is the same as that of the flying capacitor Css, and the half-bridge three-level direct current converter is convenient to start at any time.
And 4, starting up the half-bridge three-level direct current converter at any time after the half-bridge three-level direct current converter is stopped. At the moment, the inner switch tube and the outer switch tube of the half-bridge three-level direct current converter are respectively conducted complementarily. Due to the fact that shutdown control is conducted through the control method of the half-bridge three-level direct current converter, the voltage of the flying capacitor Css is the same as that of the direct current bus capacitor, the current flowing through the clamping diode is approximately zero, stable work of the diode is guaranteed, and stability of the whole system of the half-bridge three-level direct current converter is improved.
It should be understood that, although the steps in the flowchart are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 13, a control apparatus for a half-bridge three-level dc converter is provided, which includes a receiving module 10 and a control module 20. The half-bridge three-level direct current converter comprises a receiving module 10, a control module and a power supply module, wherein the receiving module is used for receiving a shutdown instruction, and the shutdown instruction is used for instructing and controlling a half-bridge three-level direct current converter to stop working; the control module 20 is configured to close the second switching tube and the third switching tube according to the shutdown instruction, and control the first switching tube and the fourth switching tube to be complementarily turned on; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
In one embodiment, the control module 20 is further configured to turn off the fourth switching tube when the first switching tube is controlled to be turned on by the first signal; when the fourth switching tube is controlled to be conducted through the second signal, the first switching tube is closed; the first signal is 180 degrees out of phase with the second signal.
In one embodiment, the control device for the half-bridge three-level dc converter further includes a turn-off module, configured to turn off the first switch tube and the fourth switch tube after a preset time period.
In one embodiment, the control device of the half-bridge three-level dc converter further includes a start module, configured to receive a start instruction, where the start instruction is used to instruct the half-bridge three-level dc converter to start operation, control the second switching tube and the third switching tube to conduct complementarily, and control the first switching tube and the fourth switching tube to conduct complementarily.
In one embodiment, the control device of the half-bridge three-level dc converter further includes a determining module, configured to determine that the half-bridge three-level dc converter is in an operating state, and when the half-bridge three-level dc converter is in the operating state, the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are in complementary conduction states.
In one embodiment, the control device of the half-bridge three-level dc converter further includes a determination module, configured to determine that the second switching tube and the third switching tube are complementarily turned on by the first driving signal and the first switching tube and the fourth switching tube are complementarily turned on by the second driving signal when the half-bridge three-level dc converter is in the operating state; at this time, the control module 20 is specifically configured to control the first switching tube and the fourth switching tube to perform complementary conduction through the second driving signal.
For specific limitations of the control apparatus of the half-bridge three-level dc converter, reference may be made to the above limitations of the control method of the half-bridge three-level dc converter, and details thereof are not repeated herein. The modules in the control device of the half-bridge three-level dc converter can be implemented in whole or in part by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, an electronic control device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 14. The electronic control device comprises a processor, a memory, a network interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the electronic control device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the electronic control device is used for communicating with an external half-bridge three-level direct current converter through a network connection. The computer program is executed by a processor to implement a method of controlling a half-bridge three-level dc converter. The display screen of the electronic control equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic control equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 14 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is provided an electronic control device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program: receiving a shutdown instruction, wherein the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working; closing the second switching tube and the third switching tube according to the stop instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
In one embodiment, when the processor executes the computer program to implement the step of controlling the complementary conduction of the first switching tube and the fourth switching tube, the following steps are specifically implemented: when the first switching tube is controlled to be conducted through the first signal, the fourth switching tube is closed; when the fourth switching tube is controlled to be conducted through the second signal, the first switching tube is closed; the first signal is 180 degrees out of phase with the second signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and after a preset time period, the first switching tube and the fourth switching tube are closed.
In one embodiment, the processor, when executing the computer program, further performs the steps of: receiving a starting instruction, wherein the starting instruction is used for instructing the half-bridge three-level direct current converter to start and work; and controlling the complementary conduction of the second switching tube and the third switching tube and the complementary conduction of the first switching tube and the fourth switching tube.
In one embodiment, before the processor executes the computer program to implement the step of closing the second switching tube and the third switching tube according to the shutdown instruction, the following steps are also specifically implemented: and determining that the half-bridge three-level direct current converter is in a working state, and when the half-bridge three-level direct current converter is in the working state, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are in a complementary conduction state.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining that the second switching tube and the third switching tube are conducted complementarily through a first driving signal and the first switching tube and the fourth switching tube are conducted complementarily through a second driving signal when the half-bridge three-level direct current converter is in a working state; when the processor executes the computer program to realize the step of controlling the complementary conduction of the first switching tube and the fourth switching tube, the following steps are specifically realized: and controlling the first switching tube and the fourth switching tube to be conducted complementarily through a second driving signal.
The application also provides a direct current conversion system. The direct current conversion system comprises a half-bridge three-level direct current converter and the electronic control device in the embodiment. The half-bridge three-level dc converter and the electronic control device have been described in detail above, and are not described herein again.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: receiving a shutdown instruction, wherein the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working; closing the second switching tube and the third switching tube according to the stop instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily; the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes which are sequentially connected in series in a half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, second switch tubes and third switch tubes which are inner switch tubes.
In one embodiment, when the computer program is executed by the processor to implement the step of controlling the complementary conduction of the first switching tube and the fourth switching tube, the following steps are specifically implemented: when the first switching tube is controlled to be conducted through the first signal, the fourth switching tube is closed; when the fourth switching tube is controlled to be conducted through the second signal, the first switching tube is closed; the first signal is 180 degrees out of phase with the second signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: and after a preset time period, the first switching tube and the fourth switching tube are closed.
In one embodiment, the computer program when executed by the processor further performs the steps of: receiving a starting instruction, wherein the starting instruction is used for instructing the half-bridge three-level direct current converter to start and work; and controlling the complementary conduction of the second switching tube and the third switching tube and the complementary conduction of the first switching tube and the fourth switching tube.
In one embodiment, before the computer program is executed by the processor to implement the steps of closing the second switching tube and the third switching tube according to the shutdown instruction, the following steps are also implemented: and determining that the half-bridge three-level direct current converter is in a working state, and when the half-bridge three-level direct current converter is in the working state, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are in a complementary conduction state.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining that the second switching tube and the third switching tube are conducted complementarily through a first driving signal and the first switching tube and the fourth switching tube are conducted complementarily through a second driving signal when the half-bridge three-level direct current converter is in a working state; when the computer program is executed by the processor to realize the step of controlling the complementary conduction of the first switching tube and the fourth switching tube, the following steps are specifically realized: and controlling the first switching tube and the fourth switching tube to be conducted complementarily through a second driving signal.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of controlling a half-bridge three-level dc converter, the method comprising:
receiving a shutdown instruction, wherein the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working;
closing the second switching tube and the third switching tube according to the shutdown instruction, and controlling the first switching tube and the fourth switching tube to be conducted complementarily;
the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes sequentially connected in series in the half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, and the second switch tube and the third switch tube are inner switch tubes.
2. The method of claim 1, wherein the controlling the first switch tube and the fourth switch tube to conduct complementarily comprises:
when the first switching tube is controlled to be conducted through a first signal, the fourth switching tube is closed;
when the fourth switching tube is controlled to be conducted through a second signal, the first switching tube is closed;
the first signal is 180 degrees out of phase with the second signal.
3. The method of claim 1, further comprising:
and closing the first switch tube and the fourth switch tube after a preset time period.
4. The method of claim 1, further comprising:
receiving a starting instruction, wherein the starting instruction is used for instructing to control the half-bridge three-level direct current converter to start to work;
and controlling the complementary conduction of the second switching tube and the third switching tube, and controlling the complementary conduction of the first switching tube and the fourth switching tube.
5. The method of claim 1, wherein prior to closing the second and third switchgears in accordance with the shutdown command, further comprising:
determining that the half-bridge three-level direct current converter is in an operating state, and when the half-bridge three-level direct current converter is in the operating state, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are in complementary conduction states.
6. The method of claim 5, further comprising:
determining that the second switching tube and the third switching tube are conducted complementarily through a first driving signal and the first switching tube and the fourth switching tube are conducted complementarily through a second driving signal when the half-bridge three-level direct current converter is in a working state;
the control of the complementary conduction of the first switch tube and the fourth switch tube comprises:
and controlling the first switching tube and the fourth switching tube to be conducted complementarily through the second driving signal.
7. A control apparatus for a half-bridge three-level dc converter, the apparatus comprising:
the receiving module is used for receiving a shutdown instruction, and the shutdown instruction is used for instructing the half-bridge three-level direct current converter to stop working;
the control module is used for closing the second switching tube and the third switching tube according to the shutdown instruction and controlling the first switching tube and the fourth switching tube to be conducted complementarily;
the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are switch tubes sequentially connected in series in the half-bridge three-level direct current converter, and the first switch tube and the fourth switch tube are outer switch tubes, and the second switch tube and the third switch tube are inner switch tubes.
8. An electronic control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 6 are implemented when the computer program is executed by the processor.
9. A dc-conversion system, characterized in that it comprises a half-bridge three-level dc-converter and an electronic control device according to claim 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152476.2A CN111262424B (en) | 2020-03-06 | 2020-03-06 | Control method and device of half-bridge three-level direct current converter and computer equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152476.2A CN111262424B (en) | 2020-03-06 | 2020-03-06 | Control method and device of half-bridge three-level direct current converter and computer equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111262424A true CN111262424A (en) | 2020-06-09 |
| CN111262424B CN111262424B (en) | 2021-08-03 |
Family
ID=70954745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010152476.2A Active CN111262424B (en) | 2020-03-06 | 2020-03-06 | Control method and device of half-bridge three-level direct current converter and computer equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111262424B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935172A (en) * | 2015-06-09 | 2015-09-23 | 南京邮电大学 | Three-level soft switch forward-flyback DC/DC converter circuit topology structure |
| CN110474550A (en) * | 2019-08-21 | 2019-11-19 | 阳光电源股份有限公司 | A kind of striding capacitance type NPC three-level topology |
-
2020
- 2020-03-06 CN CN202010152476.2A patent/CN111262424B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935172A (en) * | 2015-06-09 | 2015-09-23 | 南京邮电大学 | Three-level soft switch forward-flyback DC/DC converter circuit topology structure |
| CN110474550A (en) * | 2019-08-21 | 2019-11-19 | 阳光电源股份有限公司 | A kind of striding capacitance type NPC three-level topology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111262424B (en) | 2021-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108847769B (en) | Three-level BOOST device and control method thereof | |
| JP4910369B2 (en) | Power control device | |
| US20120069604A1 (en) | Compact power converter with high efficiency in operation | |
| US10224818B2 (en) | Power conversion apparatus and control method for power conversion apparatus | |
| CN104578741A (en) | Switching power supply device and battery charger including the same | |
| US10014761B2 (en) | Control method and device for I-type three-level circuit | |
| US20180278158A1 (en) | Bidirectional dc-dc converter | |
| CN105514939A (en) | Charging and discharging control device and control method for energy storage super-capacitor of electric workover rig | |
| EP3758208B1 (en) | Two-stage converter and method for starting the same, llc converter, and application system | |
| CN106575916A (en) | Method for controlling a battery charger having dc-dc series resonant converter | |
| CN111262424B (en) | Control method and device of half-bridge three-level direct current converter and computer equipment | |
| US20220302844A1 (en) | Control method for a dc-dc converter and dc-dc converter | |
| CN211579680U (en) | Lithium battery direct-current power supply system | |
| CN112583242B (en) | Redundant energy taking circuit of power module bypass switch and control method thereof | |
| CN209896911U (en) | DC-DC converter for fuel cell | |
| CN115117973B (en) | Voltage superposition type composite power supply system | |
| CN104167913B (en) | A kind of Sofe Switch single-phase inverter starting method | |
| CN114062917B (en) | Bypass switch high-frequency withstand voltage test circuit, method and device | |
| CN109921670B (en) | Inverter control method, inverter and readable storage medium | |
| CN114531027A (en) | Single-stage three-phase energy storage converter | |
| CN104283487A (en) | Novel electric vehicle driving system | |
| TWI759774B (en) | Electrical system and control method applied for motor drive | |
| KR101947858B1 (en) | Control method and system of converter | |
| JP2017147858A (en) | Step-up/step-down conversion apparatus, computer program and control method for step-up/step-down conversion apparatus | |
| CN115149779B (en) | Drive power supply circuit and power conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |