CN111030443B - Totem-pole bridgeless PFC circuit, control method, electronic device and medium - Google Patents
Totem-pole bridgeless PFC circuit, control method, electronic device and medium Download PDFInfo
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- CN111030443B CN111030443B CN202010023240.9A CN202010023240A CN111030443B CN 111030443 B CN111030443 B CN 111030443B CN 202010023240 A CN202010023240 A CN 202010023240A CN 111030443 B CN111030443 B CN 111030443B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a totem-pole bridgeless PFC circuit, which relates to the technical field of switching power supplies and is used for solving the problem of low efficiency of the conventional PFC circuit, and comprises an inductor L1, an inductor L2, a switching tube S1, a switching tube S2, a switching tube S3, a switching tube S4, a power frequency tube S5, a power frequency tube S6 and a load module, wherein a curve formed by an input voltage Vin in a time period is divided into a positive half period and a negative half period, the switching tube S2 and the switching tube S4 are controlled by loop output and staggered for 180-degree wave generation in the positive half period, and the power frequency tube S6, the switching tube S1 and the switching tube S3 are started after meeting preset conditions; in the negative half period, the switch tube S1 and the switch tube S3 are controlled by the loop output and staggered by 180 degrees to generate waves, and the power frequency tube S5, the switch tube S2 and the switch tube S4 are turned on after meeting the preset conditions. The invention also discloses a control method, electronic equipment and a computer readable medium.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a totem-pole bridgeless PFC circuit and a control method.
Background
With the development of switching power supply technology, a PFC (power factor correction) circuit becomes an indispensable part of a switching power supply due to input harmonic current limitation. However, the current requirements for the volume and efficiency of the switching power supply are getting smaller and higher, so that the existing PFC circuit can not meet the usage requirements, and a more efficient PFC circuit is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a totem-pole bridgeless PFC circuit, which has the advantages of improving the efficiency of the product and reducing the waste of resources.
One of the purposes of the invention is realized by adopting the following technical scheme:
a totem pole bridgeless PFC circuit comprises an inductor L1, an inductor L2, a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a power frequency tube S5, a power frequency tube S6 and a load module,
the reverse ends of the switch tube S1, the switch tube S3 and the power frequency tube S5 are connected to the first end of the load module; the positive ends of the switch tube S2, the switch tube S4 and the switch tube S6 are connected to the second end of the load module; a first end of the inductor L1 and a first end of the inductor L2 are connected and are denoted as a first input end, and a second end of the inductor L1 is connected with a forward end of the switching tube S1 and a reverse end of the switching tube S2; the second end of the inductor L2 is connected to the forward end of the switching tube S3 and the reverse end of the switching tube S4; the forward end of the power frequency tube S5 and the reverse end of the power frequency tube S6 are connected and recorded as a second input end;
the voltage difference between the first input end and the second input end is recorded as an input voltage Vin, a curve formed by the input voltage Vin in a time period is divided into a positive half period and a negative half period, when the input voltage Vin is in the positive half period, the switch tube S2 and the switch tube S4 are controlled by loop output and staggered for 180-degree wave generation, and the power frequency tube S6, the switch tube S1 and the switch tube S3 are turned on after meeting preset conditions; and in the negative half period, the switching tube S1 and the switching tube S3 are controlled by loop output and staggered for 180-degree wave generation, and the power frequency tube S5, the switching tube S2 and the switching tube S4 are started after meeting preset conditions.
Further, the duty cycle of the switching tube S1 and the switching tube S2 ranges from 0.9 to 1, and the duty cycle of the switching tube S3 and the switching tube S4 ranges from 0.9 to 1.
Further, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the power frequency tube S5 and the power frequency tube S6 are all any one of a MOSFET tube, an IGBT tube, a GaN tube, a triode, a thyristor and a relay.
Further, the inductor L1 and the inductor L2 are wound on the same magnetic core in opposite winding directions.
The second objective of the present invention is to provide a control method, which has the advantages of improving product efficiency and reducing resource waste.
The second purpose of the invention is realized by adopting the following technical scheme:
a control method is used for controlling the totem pole bridgeless PFC circuit, and comprises the following steps:
acquiring an input voltage Vin, when the input voltage Vin is in a positive half-cycle, marking a switching tube S2 and a switching tube S4 as main control tubes, and marking a switching tube S1 and a switching tube S3 as complementary tubes, when the input voltage Vin is in a negative half-cycle, marking the switching tube S1 and the switching tube S3 as main control tubes, and marking the switching tube S2 and the switching tube S4 as complementary tubes;
acquiring the duty ratio of the main control tube, judging whether the duty ratio of the main control tube reaches a preset range, and if so, correspondingly starting the main control tube;
inquiring the time corresponding to the input voltage Vin and recording as t 1;
judging whether the time T1 is within a preset time period T1 of the corresponding half period, if so, starting the corresponding power frequency tube, wherein the preset time period T1 is from a starting time T3 to a turning-off time T4, the time T4 and the time T3 are located in the same half period, and (T3-T1) are both smaller than the half period;
and judging whether the time T1 is within a preset time period T2 of the corresponding half period, if so, starting the corresponding complementary tube, wherein the preset time period T2 is from a starting time T5 to a turning-off time T6, the time T5 and the time T6 are located in the same half period, and the time (T5-T1) is less than the half period.
Further, the voltage value corresponding to the turn-on time t3 is greater than the voltage value corresponding to the turn-off time t 4; the starting time t3 is greater than or equal to the starting time t5, and the voltage value corresponding to the starting time t3 is greater than or equal to the voltage value at the starting time t 5.
Further, acquiring an input voltage Vin curve acquired and processed before the time t1, recording the starting time of the acquired and processed input voltage Vin curve as t0, and recording a half period corresponding to the time t0 as a soft start half period;
and judging whether the time t0 is greater than a time t3 corresponding to the soft start half period, if so, prohibiting the complementary tube and the power frequency tube from being started in the soft start half period and before the soft start half period, and prohibiting the main control tube from being started before the time t 0.
Further, acquiring the duty ratio of the master control tube comprises the following steps:
acquiring voltage between a first end and a second end of the load module, and recording the voltage as output voltage Vo;
obtaining the current of the first input end or the second input end, and recording the current as input current Iin;
obtaining current loop output based on the input voltage Vin, the output voltage Vo and the input current Iin, and taking the current loop output as duty ratio components;
obtaining a first duty ratio feedforward based on the input voltage Vin, the output voltage Vo and a CCM formula;
obtaining a second duty ratio feedforward based on the first duty ratio feedforward and the DCM formula;
judging whether the time t0 is greater than the time t3 of the soft start half period, if so, taking the minimum value of the first duty ratio feedforward and the second duty ratio feedforward as the current duty ratio feedforward in the soft start half period, taking the first duty ratio feedforward as the current duty ratio feedforward after the soft start half period, and if not, taking the first duty ratio feedforward as the current duty ratio feedforward;
and obtaining the duty ratio of the master control pipe based on the duty ratio component and the current space ratio feedforward.
It is a third object of the present invention to provide an electronic device for performing the second object of the present invention, comprising a processor, a storage medium, and a computer program, the computer program being stored in the storage medium, the computer program, when executed by the processor, implementing the control method described above.
It is a fourth object of the present invention to provide a computer-readable storage medium storing the second object of the present invention, having a computer program stored thereon, which when executed by a processor implements the above-described control method.
Compared with the prior art, the invention has the beneficial effects that: the bridgeless topology is adopted to replace the traditional bridged topology, so that the loss caused by bridge stacking is removed; adopt the switch tube to use as the power frequency pipe to make the whole operation of loop under the CCM mode, have the efficiency that promotes the product and reduce the extravagant advantage of resource.
Drawings
Fig. 1 is a circuit diagram of a totem-pole bridgeless PFC circuit according to an embodiment;
FIG. 2 is a flowchart of a control method according to a second embodiment;
fig. 3 is a flowchart of step S60 of the control method according to the second embodiment;
FIG. 4 is a flowchart of step S20 in FIG. 2;
fig. 5 is a block diagram of the electronic device according to the fourth embodiment.
In the figure: 1. an electronic device; 11. a processor; 12. a memory; 13. an input device; 14. and an output device.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
Example one
The embodiment provides a totem-pole bridgeless PFC circuit, and aims to solve the problem of low efficiency of the existing PFC circuit. Referring to fig. 1, the totem-pole bridgeless PFC circuit includes an inductor L1, an inductor L2, a switching tube S1, a switching tube S2, a switching tube S3, a switching tube S4, a power frequency tube S5, a power frequency tube S6, and a load module.
Specifically, the reverse ends of the switch tube S1, the switch tube S3 and the power frequency tube S5 are connected to the first end of the load module; the positive ends of the switch tube S2, the switch tube S4 and the switch tube S6 are connected to the second end of the load module; a first end of the inductor L1 and a first end of the inductor L2 are connected and are denoted as a first input end, and a second end of the inductor L1 is connected with a forward end of the switching tube S1 and a reverse end of the switching tube S2; the second end of the inductor L2 is connected to the forward end of the switching tube S3 and the reverse end of the switching tube S4; and the forward end of the power frequency tube S5 and the reverse end of the power frequency tube S6 are connected and recorded as a second input end.
The voltage difference between the first input terminal and the second input terminal is denoted as the input voltage Vin, i.e., the input voltage Vin is the voltage of the first input terminal-the voltage of the second input terminal. The voltage difference between the first terminal and the second terminal of the load module is denoted as the output voltage Vo.
It is worth to be noted that, because the input voltage Vin is ac, the curve formed by the input voltage Vin in a time period is divided into a positive half cycle and a negative half cycle, and in the positive half cycle, the switch tube S2 and the switch tube S4 are controlled by the loop output and staggered for 180 degrees to generate waves, and the power frequency tube S6, the switch tube S1 and the switch tube S3 are turned on after meeting the preset conditions; in the negative half period, the switch tube S1 and the switch tube S3 are controlled by the loop output and staggered by 180 degrees to generate waves, and the power frequency tube S5, the switch tube S2 and the switch tube S4 are turned on after meeting the preset conditions.
It should be noted that the loop control indicates that the conduction of the corresponding switch tube is related to the parameters of current, voltage and resistivity in the circuit.
In conclusion, the non-bridge topology is adopted to replace the traditional bridge topology, so that the loss caused by a bridge stack is removed; adopt the switch tube to use as the power frequency pipe to make the whole operation of loop under the CCM mode, have the efficiency that promotes the product and reduce the extravagant advantage of resource.
As a preferred technical solution, the load module includes a capacitor C and a load R, two ends of the capacitor C are connected in series with two ends of the load R, a first end of the capacitor C is connected with a first end of the load module, and a second end of the capacitor C is connected with a second end of the load module, so that the load module has the advantages of simple structure and reduced circuit oscillation. It should be understood that the load module is not limited to the above type.
As a preferable technical solution, the duty ratio ranges of the switching tube S1 and the switching tube S2 are 0.9 to 1, and the duty ratio ranges of the switching tube S3 and the switching tube S4 are 0.9 to 1. Therefore, when the main control tube stops sending waves, the corresponding complementary tubes start sending waves, and therefore corresponding waveform output is achieved in one sending wave period.
Preferably, the switching tube S1, the switching tube S2, the switching tube S3, the switching tube S4, the power frequency tube S5 and the power frequency tube S6 are all any one of MOS tubes, IGBT tubes, GaN tubes, triodes, thyristors and relays. It is understood that the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the power frequency tube S5 and the power frequency tube S6 are not limited to the above types, but are preferably GaN tubes, which have the advantages of low driving loss, low miller effect, low switching loss, low dead time, low reverse recovery, and the like.
When the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the power frequency tube S5 and the power frequency tube S6 all adopt NMOS tubes, taking the switch tube S1 as an example, the forward end of the switch tube 1 corresponds to the source (S), and the reverse end of the switch tube 1 corresponds to the drain (d). It is understood that when any one of the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the power frequency tube S5 and the power frequency tube S6 is an IGBT tube, a GaN tube, a triode, a thyristor and a relay, the corresponding current direction should be the same as the current direction when an NMOS tube is used.
Preferably, the inductor L1 and the inductor L2 are wound on the same magnetic core in opposite winding directions, so that the two magnetic flux paths of the middle magnetic core cancel each other out, and the magnetic flux loss is effectively reduced. In this technical solution, the inductor L1 and the inductor L2 are further set to have the same number of turns and the same distance, so as to better reduce the flux loss.
Example two
The present embodiment provides a control method for controlling the totem-pole bridgeless PFC circuit shown in the first embodiment, which has the advantages of improving the efficiency of the product and reducing the waste of resources.
Specifically, referring to fig. 1 and 2, the control method includes the following steps.
Step S10, the input voltage Vin is acquired. It is worth to be noted that, when the input voltage Vin is within the positive half period, the switch tube S2 and the switch tube S4 are recorded as main control tubes, the switch tube S1 and the switch tube S3 are recorded as complementary tubes, and the correspondingly turned-on power frequency tube is the power frequency tube S6; when the input voltage Vin is within the negative half period, the switch tube S1 and the switch tube S3 are marked as main control tubes, the switch tube S2 and the switch tube S4 are marked as complementary tubes, and the correspondingly turned-on power frequency tube is the power frequency tube S5.
Step S20, acquiring the duty ratio of each master control tube, and respectively judging whether the duty ratio of each master control tube reaches a preset range, if so, starting the corresponding master control tube; if not, executing the next step. Specifically, the main control tubes are controlled by loop output, that is, the duty ratio of each main control tube is related to parameters of the circuit, such as current, voltage, conductivity, and the like, that is, corresponding parameters of the circuit need to be obtained first, then the duty ratio of the main control tubes is calculated, and then the corresponding main control tubes are judged and started. It is worth noting that the two main control tubes are preferably synchronously opened, and the preset range is 3% -95%.
In step S30, the time corresponding to the input voltage Vin is queried and recorded as t 1.
Step S40, whether the time T1 is within the preset time period T1 of the corresponding half period is judged, and if yes, the corresponding power frequency tube is started; if not, executing the next step. Since the input voltage Vin appears periodically, the appearance period is denoted as T0, so that the periods of the positive half period and the negative half period are both (T0/2), it is worth to be noted that each half period has a time period T1, and the preset time period T1 is from the turn-on time T3 to the turn-off time T4. The time T3 and the time T4 in the preset time period T1 corresponding to the input voltage Vin are located in the same half period, and meet the following requirements: (T3-T1) < (T0/2), and (T4-T3) < (T0/2).
It should be noted that the preset time period T1 is the turn-on time T3 and the turn-off time T4, and the input is ac power, so that the difference between the turn-off time T4 and the turn-on time T3 of each half cycle is equal, and the difference between the turn-on times T3-n (T0/2) is equal. Where n is a positive integer and represents the number of half cycles before the input voltage Vin.
Step S50, judging whether the time T1 is within the preset time period T2 of the corresponding half period, if so, starting the corresponding complementary tube; if not, no processing is carried out.
It is noted that each half cycle has a time period T2, and the preset time period T2 is from the turn-on time T5 to the turn-off time T6. The time T5 and the time T6 in the preset time period T2 corresponding to the input voltage Vin are located in the same half period, and meet the following requirements: (T5-T1) < (T0/2), and (T6-T5) < (T0/2). The switch-off time t6 is preferably the end of the cycle.
Step S40 and step S50 may be executed independently, or step S40 may be executed first and then step S50 may be executed, or step S50 may be executed first and then step S40 may be executed.
In conclusion, the main control tube is correspondingly conducted by controlling the duty ratio through the loop, the power frequency tube and the complementary tube are correspondingly conducted by adjusting the duty ratio according to the conducting time, and the switch tube is used as the power frequency tube, so that the whole loop runs in a CCM mode, and the CCM circuit has the advantages of improving the efficiency of products and reducing resource waste.
It should be noted that the preset time period T1 is from the turn-on time T3 to the turn-off time T4, and the voltage value corresponding to the turn-on time T3 is greater than the voltage value corresponding to the turn-off time T4, so as to prevent the current from flowing backward. The preset time period T2 is from the turn-on time T5 to the turn-off time T6, the turn-on time T3 is greater than or equal to the turn-on time T5, and the voltage value corresponding to the turn-on time T3 is greater than or equal to the voltage value at the turn-on time T5. It is preferable that the opening timing t3 be the same as the opening timing t5 so that only the number of determinations is reduced to improve the overall efficiency.
In the soft start half period of the curve formed by the input voltage Vin, the duty ratio of the master control tube needs to be increased from 0 to meet the trigger condition, specifically, a timer may be used for accumulation, and when the timer is accumulated to a certain set value, the release of the duty ratio is finished. After the duty ratio is released, it is usually necessary to determine whether the input voltage Vin is smaller than a preset value, and the preset value should be smaller than a voltage value corresponding to t3, if so, the complementary tube is turned on; if not, the main control tube and the complementary tube are forbidden to be started, and the forbidden instruction is cancelled after the input voltage Vin is increased to be greater than the preset value, so that the protection effect is achieved. If the time when the main control tube finishes releasing the duty ratio is recorded as t2, it is preferable that t2 is equal to t3, so that the power frequency tube S and the complementary tube are synchronously opened.
As a preferred technical solution, referring to fig. 2 and 3, the control method further includes step S60, and the step S60 may be executed after step S40 or step S50.
Step S601, acquiring the input voltage Vin curve acquired before the time t1, and recording the starting time of the acquired input voltage Vin curve as t0 and the half period corresponding to the time t0 as the soft start half period. Let t2 denote the end of the release of the master control tube duty cycle.
It should be noted that each point on the curve of the collected and processed input voltage Vin is controlled by the control method, that is, if the control method is operated in the form of software, the starting point of the curve of the collected and processed input voltage Vin is the software starting point, that is, the time t0 corresponds to the software starting point.
Step S602, whether the time t0 is larger than the time t3 corresponding to the soft start half period is judged, if yes, the step S603 is executed, the complementary tube and the power frequency tube are forbidden to be started in the soft start half period and before the soft start half period, and the main control tube is forbidden to be started before the time t 0. It will be appreciated that during the soft-start half cycle, the corresponding time t3 meets the following requirements: (T3-T0) < (T0/2).
Specifically, during the soft start half period, when the time t0 is greater than the time t3, it indicates that the power frequency tube turn-on condition is no longer satisfied during the half period, and it cannot be turned on.
As a preferred technical solution, referring to fig. 2 and 4, the step of obtaining the duty ratio of the master control in step S20 includes steps S201 to S2010.
And step S201, acquiring the voltage between the first end and the second end of the load module, and recording the voltage as the output voltage Vo.
Step S202, obtaining a current of the first input terminal or the second input terminal, and recording the current as an input current Iin. The direction of the input current Iin is preferably the same as the direction of the input voltage Vin.
Step S203, obtaining a current loop output as a duty component based on the input voltage Vin, the output voltage Vo, and the input current Iin.
Specifically, a voltage loop output H is obtained based on the input voltage Vin and the output voltage Vo; obtaining a current loop given F based on the voltage loop output H, wherein the current loop given F is H | sin (2 | pi | F | t) |, wherein pi is a constant of 3.1415926 … …, F represents power frequency, and t represents specific time flowing through; and then obtaining current loop output based on the current loop given F and the input current Iin, namely obtaining duty ratio components.
And step S204, obtaining a first duty ratio feedforward based on the input voltage Vin, the output voltage Vo and the CCM formula. Wherein the CCM formula is: the first duty cycle feed forward is (1-VIN/VO |).
And S205, obtaining second duty ratio feedforward based on the first duty ratio feedforward and a DCM formula. Wherein the DCM formula is:
l is inductance, T is period, Ge is conductance.
Step S206, judging whether the time t0 is greater than the time t3 of the soft start half period, if so, executing step S207, taking the minimum value of the first duty ratio feedforward and the second duty ratio feedforward as the current duty ratio feedforward in the soft start half period, and taking the first duty ratio feedforward as the current duty ratio feedforward after the soft start half period; if not, step S208 is executed to use the first duty ratio feed-forward as the current duty ratio feed-forward. It will be appreciated that during the soft start half cycle, time t3 meets the following requirements: (T3-T0) < (T0/2).
And S209, obtaining the duty ratio of the master control pipe based on the duty ratio component and the current space ratio feedforward. Specifically, the duty ratio feedforward and the current duty ratio feedforward are superposed to be the duty ratio of the master control pipe.
It is worth to be noted that, when the input voltage Vin is within the soft start half period and the time t0 is greater than the time t3, that is, the power frequency tube cannot be started, if the CCM calculation formula is still used as duty ratio feedforward, the current will overshoot after startup, so that the current duty ratio feedforward within the half period can only be min (first duty ratio feedforward, second duty ratio feedforward) to ensure efficient operation of the circuit.
Example four
The electronic device 1 may be a desktop computer, a notebook computer, a server (an entity server or a cloud server), or even a mobile phone or a tablet computer,
fig. 5 is a schematic structural diagram of an electronic device provided by an input current Iin according to the present invention, and referring to fig. 5, the electronic device 1 includes a processor 11, a memory 12, an input device 13, and an output device 14; the number of the processors 11 in the computer device may be one or more, and one processor 11 is taken as an example in fig. 5; the processor 11, the memory 12, the input device 13 and the output device 14 in the electronic apparatus 1 may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5.
The memory 12, which is a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules. The memory 12 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 12 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. The memory 12 may further be arranged to comprise memory remotely arranged with respect to the processor 11, which remote memory may be connected to the electronic device 1 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
It should be noted that the input device 13 can be used for receiving data such as the input voltage Vin. The output device 14 may include a document or a display screen or the like. Specifically, when the output device is a document, the corresponding information can be recorded in the document according to a specific format, and data integration is realized while data storage is realized; when the output device is a display device such as a display screen, the directly corresponding information is put on the display device so as to facilitate the real-time viewing of the user.
EXAMPLE five
Embodiments also provide a computer-readable storage medium containing computer-executable instructions for performing the above-described control method for controlling the above-described totem-pole bridgeless PFC circuit when executed by a computer processor, comprising the steps of:
acquiring an input voltage Vin, when the input voltage Vin is in a positive half-cycle, marking a switching tube S2 and a switching tube S4 as main control tubes, and marking a switching tube S1 and a switching tube S3 as complementary tubes, when the input voltage Vin is in a negative half-cycle, marking the switching tube S1 and the switching tube S3 as main control tubes, and marking the switching tube S2 and the switching tube S4 as complementary tubes;
acquiring the duty ratio of the main control tube, judging whether the duty ratio of the main control tube reaches a preset range, and if so, correspondingly starting the main control tube;
inquiring the time corresponding to the input voltage Vin and recording as t 1;
judging whether the time T1 is within a preset time period T1, if so, starting a corresponding power frequency tube S;
and judging whether the time T1 is within a preset time period T2, and if so, opening the corresponding complementary tube.
Of course, the embodiments of the present invention provide a computer-readable storage medium whose computer-executable instructions are not limited to the above method operations.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FlASH Memory (FlASH), a hard disk or an optical disk of a computer, and includes several instructions to enable an electronic device (which may be a mobile phone, a personal computer, a server, or a network device) to execute the control method in the second embodiment of the present invention.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. The control method is characterized by being used for controlling a totem-pole bridgeless PFC circuit, wherein the totem-pole bridgeless PFC circuit comprises an inductor L1, an inductor L2, a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a power frequency tube S5, a power frequency tube S6 and a load module;
the reverse ends of the switch tube S1, the switch tube S3 and the power frequency tube S5 are connected to the first end of the load module; the positive ends of the switch tube S2, the switch tube S4 and the switch tube S6 are connected to the second end of the load module; a first end of the inductor L1 and a first end of the inductor L2 are connected and are denoted as a first input end, and a second end of the inductor L1 is connected with a forward end of the switching tube S1 and a reverse end of the switching tube S2; the second end of the inductor L2 is connected to the forward end of the switching tube S3 and the reverse end of the switching tube S4; the forward end of the power frequency tube S5 and the reverse end of the power frequency tube S6 are connected and recorded as a second input end;
the voltage difference between the first input end and the second input end is recorded as an input voltage Vin, a curve formed by the input voltage Vin in a time period is divided into a positive half period and a negative half period, when the input voltage Vin is in the positive half period, the switch tube S2 and the switch tube S4 are controlled by loop output and staggered for 180-degree wave generation, and the power frequency tube S6, the switch tube S1 and the switch tube S3 are turned on after meeting preset conditions; in the negative half period, the switching tube S1 and the switching tube S3 are controlled by loop output and staggered for 180-degree wave generation, and the power frequency tube S5, the switching tube S2 and the switching tube S4 are started after meeting preset conditions;
the control method comprises the following steps:
acquiring an input voltage Vin, when the input voltage Vin is in a positive half-cycle, marking a switching tube S2 and a switching tube S4 as main control tubes, and marking a switching tube S1 and a switching tube S3 as complementary tubes, when the input voltage Vin is in a negative half-cycle, marking the switching tube S1 and the switching tube S3 as main control tubes, and marking the switching tube S2 and the switching tube S4 as complementary tubes;
acquiring the duty ratio of the main control tube, judging whether the duty ratio of the main control tube reaches a preset range, and if so, correspondingly starting the main control tube;
inquiring the time corresponding to the input voltage Vin and recording as t 1;
judging whether the time T1 is within a preset time period T1 of the corresponding half period, if so, starting the corresponding power frequency tube, wherein the preset time period T1 is from a starting time T3 to a turning-off time T4, the time T4 and the time T3 are located in the same half period, and (T3-T1) are both smaller than the half period;
and judging whether the time T1 is within a preset time period T2 of the corresponding half period, if so, starting the corresponding complementary tube, wherein the preset time period T2 is from a starting time T5 to a turning-off time T6, the time T5 and the time T6 are located in the same half period, and the time (T5-T1) is less than the half period.
2. The control method according to claim 1, characterized in that the voltage value corresponding to the turn-on time t3 is greater than the voltage value corresponding to the turn-off time t 4; the starting time t3 is greater than or equal to the starting time t5, and the voltage value corresponding to the starting time t3 is greater than or equal to the voltage value at the starting time t 5.
3. The control method according to claim 2, characterized by further comprising the steps of:
acquiring an input voltage Vin curve acquired before the time t1, recording the starting time of the acquired input voltage Vin curve as t0, and recording a half period corresponding to the time t0 as a soft start half period;
and judging whether the time t0 is greater than a time t3 corresponding to the soft start half period, if so, prohibiting the complementary tube and the power frequency tube from being started in the soft start half period and before the soft start half period, and prohibiting the main control tube from being started before the time t 0.
4. The control method of claim 3, wherein obtaining the duty cycle of the master control tube comprises:
acquiring voltage between a first end and a second end of the load module, and recording the voltage as output voltage Vo;
obtaining the current of the first input end or the second input end, and recording the current as input current Iin;
obtaining current loop output based on the input voltage Vin, the output voltage Vo and the input current Iin, and taking the current loop output as duty ratio components;
obtaining a first duty ratio feedforward based on the input voltage Vin, the output voltage Vo and a CCM formula;
obtaining a second duty ratio feedforward based on the first duty ratio feedforward and the DCM formula;
judging whether the time t0 is greater than the time t3 corresponding to the soft start half period, if so, taking the minimum value of the first duty ratio feedforward and the second duty ratio feedforward as the current duty ratio feedforward in the soft start half period, taking the first duty ratio feedforward as the current duty ratio feedforward after the soft start half period, and if not, taking the first duty ratio feedforward as the current duty ratio feedforward;
and obtaining the duty ratio of the master control pipe based on the duty ratio component and the current space ratio feedforward.
5. The control method of claim 1, wherein the sum of the duty cycles of the switching tube S1 and the switching tube S2 ranges from 0.9 to 1, and the duty cycles of the switching tube S3 and the switching tube S4 ranges from 0.9 to 1.
6. The control method according to claim 1, wherein the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4, the power frequency tube S5 and the power frequency tube S6 are all any one of MOSFET tubes, GaN tubes, triodes, thyristors and relays.
7. The control method according to any one of claims 5 to 6, wherein the inductor L1 and the inductor L2 are wound on the same magnetic core in opposite winding directions.
8. An electronic device comprising a processor, a storage medium, and a computer program, the computer program being stored in the storage medium, wherein the computer program, when executed by the processor, implements the control method of any one of claims 1 to 7.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the control method according to any one of claims 1 to 7.
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| CN202010023240.9A CN111030443B (en) | 2020-01-09 | 2020-01-09 | Totem-pole bridgeless PFC circuit, control method, electronic device and medium |
| PCT/CN2020/137522 WO2021139507A1 (en) | 2020-01-09 | 2020-12-18 | Totem-pole bridgeless pfc circuit, control method, electronic device, and medium |
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| CN111669044B (en) * | 2020-06-23 | 2021-09-07 | 湖南大学 | Cascaded staggered totem-pole bridgeless PFC circuit and control method thereof |
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| WO2021139507A1 (en) | 2021-07-15 |
| CN111030443A (en) | 2020-04-17 |
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Application publication date: 20200417 Assignee: Hangzhou Fuyang Zhongheng Electric Co.,Ltd. Assignor: HANGZHOU ZHONHEN ELECTRIC Co.,Ltd. Contract record no.: X2021330000442 Denomination of invention: Totem pole bridgeless PFC circuit, control method, electronic equipment and medium Granted publication date: 20201110 License type: Common License Record date: 20211018 |