CN117795837A - Voltage conversion circuit, control method and energy storage device - Google Patents
Voltage conversion circuit, control method and energy storage device Download PDFInfo
- Publication number
- CN117795837A CN117795837A CN202280004149.XA CN202280004149A CN117795837A CN 117795837 A CN117795837 A CN 117795837A CN 202280004149 A CN202280004149 A CN 202280004149A CN 117795837 A CN117795837 A CN 117795837A
- Authority
- CN
- China
- Prior art keywords
- voltage
- conversion circuit
- switching tube
- voltage conversion
- driving signal
- 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.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 187
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004146 energy storage Methods 0.000 title claims description 16
- 230000008859 change Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000004590 computer program Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A control method of a voltage conversion circuit, comprising: acquiring a voltage variation of an input voltage of a voltage conversion circuit; stopping outputting the driving signal to the voltage conversion circuit when the voltage variation of the input voltage is larger than a preset voltage variation threshold; when the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length, acquiring the input voltage and the target output voltage of the voltage conversion circuit; generating a first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in a first bridge arm module; and acquiring the output current of the voltage conversion circuit, and outputting a second driving signal to a second switching tube in a second bridge arm module when the duration of the output current larger than the preset current threshold reaches a second preset duration.
Description
The application belongs to the technical field of circuits, and particularly relates to a voltage conversion circuit, a control method and energy storage equipment.
The statements herein merely provide background information related to the present application and may not necessarily constitute exemplary techniques.
When charging a tank circuit having a battery or an energy storage device, a charging power supply generally provides a power supply voltage, and the power supply voltage is converted by a voltage conversion circuit to obtain a suitable charging voltage, and the charging voltage is used for charging the tank circuit. During the process of charging the tank circuit, a sudden jump of the power supply voltage may occur, for example, the power supply voltage suddenly increases to a higher value, and in this case, in order to avoid damage to components in the circuit, the bridge arm unit in the voltage conversion circuit is usually controlled to be turned off. When the current in the circuit is detected to be reduced, the voltage conversion circuit is started again to charge the energy storage circuit, so that the voltage conversion circuit is easy to generate larger internal loss, and the voltage conversion circuit is damaged.
Disclosure of Invention
According to various embodiments of the present application, a voltage conversion circuit, a control method, and an energy storage device are provided.
According to an aspect of an embodiment of the present application, a control method of a voltage conversion circuit is provided, where the voltage conversion circuit is configured to convert an input dc power supply and output a power supply signal, and the voltage conversion circuit includes a first bridge arm module, an inductor, and a second bridge arm module; the first bridge arm module and the second bridge arm module form an H bridge arm circuit through the inductor, and the control method of the voltage conversion circuit comprises the following steps:
acquiring a voltage variation of an input voltage of the voltage conversion circuit;
stopping outputting a driving signal to the voltage conversion circuit when the voltage variation of the input voltage is larger than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working;
when the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length, acquiring the input voltage and the target output voltage of the voltage conversion circuit;
generating a first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in the first bridge arm module, wherein the first driving signal is used for controlling the first switching tube to work;
acquiring output current of the voltage conversion circuit, and outputting a second driving signal to a second switching tube in the second bridge arm module when the duration of the output current larger than a preset current threshold reaches a second preset duration; the second driving signal is used for controlling the second switching tube to be conducted;
the first switching tube is a main switching tube in a current voltage change mode of the voltage conversion circuit; the second switching tube is a switching tube used for forming a power supply loop with the main switching tube.
According to an aspect of the embodiments of the present application, there is provided a voltage conversion circuit for converting an input dc power supply and outputting a power supply signal, the voltage conversion circuit including:
the device comprises a control module, a first bridge arm module, an inductor and a second bridge arm module; the first bridge arm module and the second bridge arm module form an H bridge arm circuit through the inductor;
the control module is used for acquiring the voltage variation of the input voltage;
the control module is further used for stopping outputting a driving signal to the voltage conversion circuit when the voltage variation of the input voltage is larger than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working;
the control module is further configured to obtain an input voltage and a target output voltage of the voltage conversion circuit when a duration of stopping the voltage conversion circuit reaches a first preset duration;
the control module is further configured to generate a first driving signal according to the input voltage and the target output voltage, and output the first driving signal to a first switching tube in the first bridge arm module, where the first driving signal is used to control the first switching tube to work;
the control module is further configured to obtain an output current of the voltage conversion circuit, and output a second driving signal to a second switching tube in the second bridge arm module when a duration time that the output current is greater than a preset current threshold reaches a second preset duration time; the second driving signal is used for controlling the second switching tube to be conducted;
the first switching tube is a main switching tube in a current voltage change mode of the voltage conversion circuit; the second switching tube is a switching tube used for forming a power supply loop with the main switching tube.
According to one aspect of embodiments of the present application, there is provided an energy storage device including an energy storage circuit and a voltage conversion circuit provided by any embodiment of the present application.
According to an aspect of the embodiments of the present application, there is further provided a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of any of the methods described above when executing the computer program.
According to an aspect of the embodiments of the present application, there is also provided a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method of any of the above.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 schematically shows a first configuration diagram of a voltage conversion circuit according to an embodiment of the present application.
Fig. 2 schematically shows a flowchart of a control method of the voltage conversion circuit provided in one embodiment of the present application.
Fig. 3 schematically shows a waveform diagram of a voltage conversion circuit under a conventional control method.
Fig. 4 schematically shows a waveform diagram of a voltage conversion circuit to which the control method of the present application is applied.
Fig. 5 schematically illustrates a second configuration diagram of the voltage conversion circuit according to an embodiment of the present application.
Fig. 6 schematically shows a third configuration diagram of the voltage conversion circuit provided in one embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
As shown in fig. 1, a voltage conversion circuit 100 provided in an embodiment of the present application includes a first bridge arm module 110, an inductance L, and a second bridge arm module 120. The first bridge arm module 110 is connected to the second bridge arm module 120 through an inductance L, thereby forming an H-bridge arm circuit. The first bridge arm module 110 is configured to be connected to the dc power supply 200, and receive an input voltage provided by the dc power supply 200. After converting the input voltage provided by the dc power supply 200, the voltage conversion circuit 100 outputs a corresponding output voltage through the second bridge arm module 120.
As shown in fig. 2, the control method of the voltage conversion circuit provided in the embodiment of the present application includes steps 210 to 250, which are specifically as follows:
step 210, obtaining a voltage variation of an input voltage of the voltage conversion circuit.
Specifically, as shown in fig. 1, the input voltage of the voltage conversion circuit 100 is supplied from a dc power supply 200. The dc power supply 200 may be an energy storage device that provides dc power, or may be a conversion circuit that provides dc power after converting other power sources. For example, the direct current power supply 200 is a battery that stores electric energy. As another example, the dc power supply 200 is a power supply system that converts solar energy into electric energy and outputs dc power.
In practical applications, the dc power supplied by the dc power supply 200 generally has a certain fluctuation, and the fluctuation of the dc power is represented by the voltage variation of the input voltage of the voltage conversion circuit 100. For example, the dc power supply 200 is a power supply system that converts solar energy into electric energy and outputs dc power, and the dc power converted from the solar energy has a large fluctuation due to instability of solar illumination, thereby causing a jump in the input voltage of the voltage conversion circuit.
In one embodiment of the present application, the voltage variation of the input voltage may be a voltage variation of a preset time interval. For example, when the input voltage is detected to be a first voltage value at a first time and detected to be a second voltage value at a second time after a preset time interval, the voltage variation is the difference between the second voltage value and the first voltage value. The preset time interval may be set according to actual needs, for example, the preset time interval may be set according to a fluctuation rule of the direct current.
And 220, stopping outputting the driving signal to the voltage conversion circuit when the voltage variation of the input voltage is greater than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working.
Specifically, when the voltage variation of the input voltage is greater than the preset voltage variation threshold, it indicates that the jump of the input voltage is greater, and in order to prevent the components in the voltage conversion circuit 100 from being damaged due to the impact caused by the greater voltage jump, the output of the driving signal to the voltage conversion circuit 100 is stopped at this time, so that the voltage conversion circuit 100 stops working.
For example, when the preset voltage change threshold is 9V and the input voltage jumps from 70V to 80V, the voltage change amount is larger than the preset voltage change threshold, and the output of the driving signal to the voltage conversion circuit 100 is stopped at this time, so that the voltage conversion circuit 100 stops working.
It is easy to understand that when the voltage variation of the input voltage is smaller than the preset voltage variation threshold, the fluctuation of the input voltage is smaller, and the input voltage can be considered to be still in a steady state, so that the working state of the voltage conversion circuit is not required to be changed.
Please refer to fig. 1. The voltage conversion function of the voltage conversion circuit 100 is actually implemented by the operation of the first bridge arm module 110 and the second bridge arm module 120 according to the respective driving signals and by combining the functions of the inductance L. When the voltage variation of the input voltage of the voltage conversion circuit 100 is greater than the preset voltage variation threshold, the output of the driving signal to the voltage conversion circuit 100 is stopped, and the output of the driving signal to the first bridge arm module 110 and the second bridge arm module 120 is stopped, so as to control the first bridge arm module 110 and the second bridge arm module 120 to stop working.
It can be understood that the voltage conversion circuit 100 is controlled to stop operating by stopping outputting the driving signal to the voltage conversion circuit 100. Since the voltage conversion circuit 100 stops operating, the current of the inductor L is gradually exhausted within the first preset period of time without the input voltage.
Step 230, when the time length of stopping the operation of the voltage conversion circuit reaches the first preset time length, the input voltage and the target output voltage of the voltage conversion circuit are obtained.
In this embodiment, the first preset time period is used to describe a time period for the voltage conversion circuit 100 to freewheel the current of the inductor L until the inductor L is depleted without driving a driving signal.
In detail, referring to fig. 1, after stopping outputting the driving signal to the voltage conversion circuit 100, in the voltage conversion circuit 100, due to the presence of the inductor L, the electric energy stored in the inductor L is released through the freewheel loop formed by the second switching tube of the second bridge arm module 120, so the first preset duration is at least equal to the freewheel duration of the inductor L in this embodiment. When the period of time that the voltage conversion circuit 100 stops operating reaches the first preset period of time, it is determined that the electric energy on the inductor L is completely released, that is, the current of the inductor L is reduced to 0A, at this time, the input voltage and the target output voltage of the voltage conversion circuit 100 can be obtained, and the magnitude of the driving signal retransmitted to the voltage conversion circuit 100 can be calculated by using the input voltage and the target output voltage. At this time, the input voltage of the voltage conversion circuit 100 at the present time is obtained. The target output voltage is a target voltage to be input to the subsequent circuit by the voltage conversion circuit 100, and may be a current voltage of the subsequent circuit.
For example, the post-stage circuit is a tank circuit, and the output voltage of the voltage conversion circuit 100 is used to charge the tank circuit, and the target output voltage may be the current voltage of the tank circuit or the target voltage for charging the tank circuit.
In one embodiment of the present application, in order to ensure that the current of the inductor L is gradually exhausted when the period of time during which the voltage conversion circuit 100 stops operating reaches a first preset period of time, the first preset period of time may be set to be greater than or equal to the current freewheel period of the inductor L.
For example, if the frequency of the voltage conversion circuit 100 shown in fig. 1 is 100KHz, the freewheel time of the inductance L is approximately 10us, and the first preset time period may be set to 10us.
Step 240, generating a first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in the first bridge arm module, where the first driving signal is used to control the first switching tube to work; the first switching tube is a main switching tube of a voltage change mode where the voltage conversion circuit is currently located.
Specifically, the voltage variation modes of the voltage conversion circuit 100 include a step-up mode and a step-down mode, the step-up mode being that the voltage conversion circuit 100 performs a step-up operation on an input voltage so that an output voltage is higher than the input voltage. The step-down mode is to step down the input voltage by the voltage conversion circuit 100 so that the output voltage is lower than the input voltage.
Referring to fig. 1, the first bridge arm module 110 includes a first switching tube Q1 and a fourth switching tube Q4, and the second bridge arm module 120 includes a second switching tube Q2 and a third switching tube Q3. When the voltage conversion circuit is in a step-down mode, the first switching tube Q1 is a main switching tube, the fourth switching tube Q4 is a follow current switching tube, the second switching tube Q2 is constantly on (when the current is smaller, the second switching tube Q2 can also be in an off state, the current can pass through a body diode of the second switching tube Q2 to form a power supply loop), the first switching tube Q1 forms a power supply loop, and the third switching tube Q3 is constantly off. When the voltage conversion circuit is in a boost mode, the third switching tube Q3 is a main switching tube, the second switching tube Q2 is a follow current switching tube, the first switching tube Q1 is constantly conducted, a power supply loop is formed with the third switching tube Q3, and the fourth switching tube Q4 is constantly turned off.
After the period of time that the voltage conversion circuit 100 stops operating reaches the first preset period of time, the current of the inductor L is exhausted, and then the driving signal can be provided to the voltage conversion circuit 100 again. In general, a voltage jump refers to a sudden increase in voltage. For convenience of explanation, in the present embodiment, the voltage conversion circuit is operated in the buck mode, so the first switching tube Q1 in the first bridge arm module 110 is a main switching tube, and the fourth switching tube Q4 is a freewheeling switching tube. At this time, since all the switching tubes are turned off in step 220, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are all in the off state. The first driving signal is input to the first switching tube Q1 in the first bridge arm module 110.
In one embodiment of the present application, the calculating process of the first driving signal includes: determining a driving signal duty cycle according to the input voltage and the target output voltage; the first drive signal is generated according to the drive signal duty cycle.
The first drive signal is a PWM (Pulse Width Modulation, pulse width modulated) signal, and the corresponding first drive signal is generated by determining the drive signal duty cycle.
In one embodiment of the present application, the driving signal duty ratio is determined according to the input voltage and the target output voltage, specifically, the ratio of the target output voltage to the input voltage of the voltage conversion circuit is taken as the driving signal duty ratio.
For example, the input voltage is 80V and the target output voltage is 48V, the driving signal duty ratio is calculated as follows:
duty cycle=48/80×100% =60%.
And generating a PWM signal with the duty ratio of 60% as a first driving signal according to the calculated duty ratio.
In one embodiment of the present application, before outputting the first driving signal to the first switching tube, the method further includes: detecting whether the input current of the voltage conversion circuit is smaller than or equal to a preset current threshold value; when the input current of the voltage conversion circuit is smaller than or equal to a preset current threshold value, after the input voltage and the target output voltage of the voltage conversion circuit are obtained, a step of generating a first driving signal according to the input voltage and the target output voltage and outputting the first driving signal to a first switching tube in the first bridge arm module is executed.
Specifically, after the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length, the first driving signal is output to the first switching tube when the input current of the voltage conversion circuit is detected to be smaller than or equal to a preset current threshold value. The preset threshold value may be determined according to a power-down speed of the voltage conversion circuit.
Step 250, obtaining output current of the voltage conversion circuit, and outputting a second driving signal to a second switching tube in a second bridge arm module when the duration of the output current larger than a preset current threshold reaches a second preset duration; the second driving signal is used for controlling the second switching tube to be conducted; the second switching tube is a switching tube for forming a power supply loop with the main switching tube.
Specifically, as shown in fig. 1, each switching tube in the voltage conversion circuit 100 has a respective body diode, the first switching tube Q1 has a body diode D1, the second switching tube Q2 has a body diode D2, the third switching tube Q3 has a body diode D3, and the fourth switching tube Q4 has a body diode D4. After the first driving signal is output to the first switching tube Q1 in the first bridge arm module 100, the first switching tube Q1 starts to operate under the driving of the first driving signal, and the inductor L stores electric energy, so that the current flowing through the first switching tube Q1 flows through the inductor L and then flows to the post-stage circuit of the voltage conversion current 100 through the body diode D2 of the second switching tube Q2 because the second switching tube Q2 is not turned on. When the duration that the output current (corresponding to the current on the inductor L) of the voltage conversion circuit 100 is greater than the preset current threshold reaches the second preset duration, a second driving signal is output to the second switching tube Q2 in the second bridge arm module 120, so as to control the second switching tube Q2 to be turned on. The second switching tube Q2 is conducted when the duration of the output current larger than the preset current threshold reaches the second preset duration, so that circuit damage caused by the fact that current in a later-stage circuit flows backward to a voltage conversion circuit when the initial small current is started can be avoided, high loss caused by the fact that large current flows through a body diode of the switching tube can be avoided, and the fault rate of the switching tube is reduced.
In one embodiment of the present application, the preset current threshold and the second preset time period may be determined based on body diode loss. For example, the preset current threshold is set to 2.5A, the second preset time period is set to 3000 control periods, the control periods refer to periods of the PWM signal, and typically 3000 control periods are 30ms.
In one embodiment of the present application, when the voltage conversion circuit 100 is in the buck mode, the third switching tube Q3 is turned off constantly, and then, when the second driving signal is output, the third driving signal is further output to the third switching tube Q3, and the third driving signal controls the third switching tube Q3 to be turned off constantly, so that circuit damage caused by circuit shorting due to simultaneous conduction of the third switching tube Q3 and the second switching tube Q2 caused by false triggering is avoided. Meanwhile, the fourth switching tube Q4 is a freewheeling switching tube, and the waveforms of the fourth driving signal corresponding to the fourth switching tube Q4 and the first driving signal are opposite, namely, the fourth driving signal and the first driving signal are complementarily conducted. In other embodiments, the driving signals of the fourth switching tube Q4 and the first switching tube Q2 are not strictly opposite, and only the fourth switching tube Q4 needs to be ensured to be in a conductive state when the freewheel current is larger than the preset value, and meanwhile, the fourth switching tube Q4 and the first switching tube Q2 need to be ensured not to be simultaneously conductive.
In the related art, when an abrupt jump of the input voltage of the voltage conversion circuit 100 is detected, after the driving signal of the voltage conversion circuit 100 is usually stopped for a period of time, the driving signal is provided to each switching tube of the voltage conversion circuit 100 again, at this time, the second driving signal of the second switching tube Q2 that should be turned off is still constant to be high level because the turn-off logic of the second switching tube Q2 is not restored, and the constant high level and the large duty ratio driving signal maintained by the fourth switching tube Q4 form a boost conversion of the back-stage circuit voltage to the reverse current of the dc power supply, and the boost conversion causes a reverse large current on the inductance, thereby causing damage to the switching tube through which the current flows.
In the technical solution provided in the embodiment of the present application, by stopping outputting the driving signal to the voltage conversion circuit 100 when the voltage variation is greater than the preset voltage variation threshold, when the duration of stopping the operation of the voltage conversion circuit 100 reaches the first preset duration, the first driving signal generated based on the current output voltage and the target output voltage is provided to the first switching tube Q1, so as to control the first switching tube Q1 to operate. When the duration that the output current is larger than the preset current threshold reaches the second preset duration, outputting a second driving signal to the second switching tube Q2 to control the second switching tube Q2 to be constantly conducted. Therefore, the restarting of the voltage conversion circuit 100 during the jump of the input voltage is realized, the mode of providing the first driving signal and then providing the second driving signal is adopted, the current of the voltage conversion circuit 100 can be completely released after the driving signal is turned off due to the large change amount of the power supply voltage, the misjudgment on the working state of the voltage conversion circuit 100 during the provision of the driving signal again in the related technical scheme is avoided, the problem of current backflow caused by restarting the voltage conversion circuit 100 is avoided, the loss of a body diode during the conduction of a switching tube is reduced, the fault rate of the circuit is reduced, and the stability of the circuit is improved.
The beneficial effects of the present solution are illustrated by taking the example of the abrupt transition of the input of the voltage conversion circuit 100 from steady state 70V/13A to 80V. Fig. 3 schematically shows a waveform diagram of the voltage conversion circuit 100 under the control method of the related art. In the waveform diagram shown in fig. 3, a curve 1 is a current waveform of the inductor L, a curve 2 is a driving signal waveform of the second switching tube Q2, a curve 3 is a driving signal waveform of the fourth switching tube Q4, and a curve 4 is a driving signal waveform of the first switching tube Q1. As shown in fig. 3, when the input voltage jumps, the driving signals of the switching transistors are turned off, the inductor current drops to 0, and then the voltage conversion circuit 100 is restarted, i.e., the driving signals are provided for the switching transistors again, the inductor current increases rapidly in the opposite direction, a current peak is formed in the waveform diagram, the device is damaged, and then the circuit stops working.
Fig. 4 schematically shows a waveform diagram of a voltage conversion circuit to which the control method of the present application is applied. In the waveform diagram shown in fig. 4, a curve a is a current waveform of the inductor L, a curve B is a driving signal waveform of the second switching tube Q2, a curve C is a driving signal waveform of the fourth switching tube Q4, and a curve D is a driving signal waveform of the first switching tube Q1. As can be seen from fig. 4, by providing the driving signal of the first switching tube Q1 first, when the duration of the output current greater than the preset current threshold reaches the second preset duration, the driving signal of the second switching tube Q2 is provided, the inductor current is recovered normally according to the voltage change mode after the jump, the current waveform is not spiked, and the circuit device is operated normally without damage. Therefore, the control method of the voltage conversion circuit can avoid current backflow in the traditional technical scheme, is beneficial to reducing the failure rate of the circuit and improves the stability of the circuit.
Fig. 5 schematically illustrates a second block diagram of the voltage conversion circuit according to an embodiment of the present application, where the voltage conversion circuit according to the embodiment of the present application may be controlled by the control method of the voltage conversion circuit according to the embodiment described above.
As shown in fig. 5, the voltage conversion circuit 100 provided in the embodiment of the present application includes a first bridge arm module 110, an inductance L, a second bridge arm module 120, and a control module 130, where the first bridge arm module 110 is connected to the second bridge arm module 120 through the inductance L, so as to form an H bridge arm circuit. The dc power supply 200 is connected to the first arm module 110, and supplies an input voltage to the voltage conversion circuit 100. After converting the input voltage provided by the dc power supply 200, the voltage conversion circuit 100 outputs a power supply signal, that is, the output voltage of the voltage conversion circuit 100, through the second arm module 120.
The control module 130 is connected to the first bridge arm module 110 and the second bridge arm module 120, and is configured to provide driving signals for the first bridge arm module 110 and the second bridge arm module 120. The control module 130 is further configured to detect an output voltage of the voltage conversion circuit 100, so as to implement the control method of the voltage conversion circuit according to any embodiment of the present application. Specifically, the control method of the voltage conversion circuit comprises the following steps: acquiring a voltage variation of an input voltage of a voltage conversion circuit; stopping outputting the driving signal to the voltage conversion circuit when the voltage variation of the input voltage is larger than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working; when the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length, acquiring the input voltage and the target output voltage of the voltage conversion circuit; generating a first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in the first bridge arm module, wherein the first driving signal is used for controlling the first switching tube to work; the first switching tube is a main switching tube in a current voltage change mode of the voltage conversion circuit; acquiring output current of the voltage conversion circuit, and outputting a second driving signal to a second switching tube in a second bridge arm module when the duration of the output current larger than a preset current threshold reaches a second preset duration; the second driving signal is used for controlling the second switching tube to be conducted; the second switching tube is a switching tube for forming a power supply loop with the main switching tube.
The specific details of the control method of the voltage conversion circuit implemented by the control module 130 can refer to the descriptions of the foregoing embodiments, and are not described herein.
Fig. 6 schematically shows a third configuration diagram of a voltage conversion circuit according to an embodiment of the present application, which is a further refinement of the above embodiment.
As shown in fig. 6, the voltage conversion circuit 100 provided in the embodiment of the present application includes a first bridge arm module 110, an inductance L, a second bridge arm module 120, a control module MCU, a first amplifying module, and a second amplifying module. The first bridge arm module 110 includes a first switching tube Q1 and a fourth switching tube Q4, and the second bridge arm module 120 includes a second switching tube Q2 and a third switching tube Q3.
The first end of the first switching tube Q1 is connected to a direct current power supply DC, where the direct current power supply DC may be a direct current power supply PV provided by a solar energy system.
The second end of the first switching tube Q1 is connected with the first node T1. The first end of the fourth switching tube Q4 is connected with the first node T1, and the second end of the fourth switching tube Q4 is grounded. The first end of the second switching tube Q2 is connected to the tank circuit 300, and the second end of the second switching tube Q2 is connected to the second node T2. The first end of the third switching tube Q3 is connected with the second node T2, and the second end of the third switching tube Q3 is grounded. One end of the inductor L is connected with the first node T1, and the other end of the inductor L is connected with the second node T2.
The control end of the first switching tube Q1 and the control end of the fourth switching tube Q4 are respectively connected with a first amplifying module, and the control end of the second switching tube Q2 and the control end of the third switching tube Q3 are respectively connected with a second amplifying module. The first amplifying module and the second amplifying module are respectively connected with the control module MCU.
During operation of the voltage conversion circuit 100, the control module MCU generates two sets of driving signals: a first set of drive signals and a second set of drive signals. The first group of driving signals are input to a first amplifying module, and the first driving signals and the fourth driving signals are output after being processed by the first amplifying module, wherein the first driving signals are input to the control end of a first switching tube Q1 so as to control the on or off of the first switching tube Q1; the fourth driving signal is input to the control end of the fourth switching tube Q4 to control the on or off of the fourth switching tube Q4. The second group of driving signals are input to a second amplifying module, and the second driving signals and a third driving signal are output after being processed by the second amplifying module, wherein the second driving signals are input to the control end of a second switching tube Q2 so as to control the on or off of the second switching tube Q2; the third driving signal is input to the control end of the third switching tube Q3 to control the on or off of the third switching tube Q3.
The operation of the voltage conversion circuit 100 includes two voltage variation modes: the voltage change module where the voltage conversion circuit 100 is located can be judged by the control module MCU. When the control module MCU determines that the voltage conversion circuit 100 needs to output a voltage higher than the input voltage, the control voltage conversion circuit 100 operates in a boost mode, at this time, the third switching tube Q3 is a main switching tube, the second switching tube Q2 is a freewheel switching tube, the first switching tube Q1 is constantly turned on, a power supply loop is formed with the third switching tube Q3, and the fourth switching tube Q4 is constantly turned off. When the control module MCU determines that the voltage conversion circuit 100 needs to output a voltage lower than the input voltage, the control module MCU controls the voltage conversion circuit 100 to operate in the buck mode, at this time, the first switching tube Q1 is a main switching tube, the fourth switching tube Q4 is a freewheel switching tube, the second switching tube Q2 is constantly turned on, a power supply loop is formed with the first switching tube Q1, and the third switching tube Q3 is constantly turned off.
It is readily understood that the voltage conversion circuit 100 provided in all embodiments of the present application may be applied in a maximum power tracking MPPT solar controller.
Taking the post-stage circuit of the voltage conversion circuit 100 as a tank circuit, the dc power supply 200 is an example of a power supply system that converts solar energy into electric energy and outputs dc power. The voltage conversion circuit 100 converts the voltage of the first direct current PV supplied from the power supply system, and outputs a second direct current power supply DC for charging the tank circuit.
The embodiment of the present application further provides an energy storage device, where the energy storage device includes an energy storage circuit and a voltage conversion circuit for providing a charging voltage for the energy storage circuit, where the voltage conversion circuit may be the voltage conversion circuit 100 provided in any embodiment of the present application, and may be controlled by a control method of the voltage conversion circuit provided in any embodiment of the present application, and a specific structure of the voltage conversion circuit and a control method thereof may refer to related descriptions in the foregoing embodiment, which are not repeated herein.
According to an aspect of the embodiments of the present application, there is further provided a computer device including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the control method of the voltage conversion circuit when executing the computer program.
According to an aspect of the embodiments of the present application, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the control method of a voltage conversion circuit described above.
The control method of the voltage conversion circuit may refer to the related description in the foregoing embodiments, and will not be repeated here.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
- The control method of the voltage conversion circuit is characterized in that the voltage conversion circuit is used for converting an input direct-current power supply and outputting a power supply signal, and the voltage conversion circuit comprises a first bridge arm module, an inductor and a second bridge arm module; the first bridge arm module and the second bridge arm module form an H bridge arm circuit through the inductor, and the control method of the voltage conversion circuit comprises the following steps:acquiring a voltage variation of an input voltage of the voltage conversion circuit;stopping outputting a driving signal to the voltage conversion circuit when the voltage variation of the input voltage is larger than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working;when the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length, acquiring the input voltage and the target output voltage of the voltage conversion circuit;generating a first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in the first bridge arm module, wherein the first driving signal is used for controlling the first switching tube to work;acquiring output current of the voltage conversion circuit, and outputting a second driving signal to a second switching tube in the second bridge arm module when the duration of the output current larger than a preset current threshold reaches a second preset duration; the second driving signal is used for controlling the second switching tube to be conducted;the first switching tube is a main switching tube in a current voltage change mode of the voltage conversion circuit; the second switching tube is a switching tube used for forming a power supply loop with the main switching tube.
- The control method of a voltage conversion circuit according to claim 1, wherein after the step of stopping outputting a drive signal to the voltage conversion circuit when the voltage variation amount of the input voltage is larger than a preset voltage variation threshold value, further comprising:detecting whether the input current of the voltage conversion circuit is smaller than or equal to a preset current threshold value;and when the input current of the voltage conversion circuit is smaller than or equal to the preset current threshold, after the input voltage and the target output voltage of the voltage conversion circuit are obtained, executing the step of generating the first driving signal according to the input voltage and the target output voltage, and outputting the first driving signal to a first switching tube in the first bridge arm module.
- The control method of a voltage conversion circuit according to claim 1 or 2, wherein the generating a first drive signal from the input voltage and a target output voltage includes:determining a drive signal duty cycle from the input voltage and the target output voltage;and generating the first driving signal according to the duty ratio of the driving signal.
- The control method of a voltage conversion circuit according to claim 3, wherein the determining a driving signal duty ratio from the input voltage and the target output voltage includes:and taking the ratio of the target output voltage to the input voltage as the duty ratio.
- The control method of the voltage conversion circuit of claim 1, wherein the second leg module further comprises a third switching tube, the control method further comprising:and when the second driving signal is output to a second switching tube in the second bridge arm module, a third driving signal is also output to a third switching tube in the second bridge arm module, and the third driving signal is used for controlling the third switching tube to be constantly turned off.
- The control method of a voltage conversion circuit according to claim 4, wherein the first preset time period is longer than or equal to a current freewheel period of the voltage conversion circuit, the current freewheel period of the voltage conversion circuit representing a duration in a freewheel state in a change mode in which the voltage conversion circuit is currently located.
- A voltage conversion circuit for converting an input dc power supply and outputting a power supply signal, the voltage conversion circuit comprising:the device comprises a control module, a first bridge arm module, an inductor and a second bridge arm module; the first bridge arm module and the second bridge arm module form an H bridge arm circuit through the inductor;the control module is configured to acquire the voltage variation of the input voltage;the control module is further configured to stop outputting a driving signal to the voltage conversion circuit when the voltage variation of the input voltage is greater than a preset voltage variation threshold value so as to control the voltage conversion circuit to stop working;the control module is further configured to acquire the input voltage and the target output voltage of the voltage conversion circuit when the time length of stopping the operation of the voltage conversion circuit reaches a first preset time length;the control module is further configured to generate a first driving signal according to the input voltage and the target output voltage, and output the first driving signal to a first switching tube in the first bridge arm module, wherein the first driving signal is used for controlling the first switching tube to work;the control module is further configured to obtain an output current of the voltage conversion circuit, and output a second driving signal to a second switching tube in the second bridge arm module when the duration of the output current greater than a preset current threshold reaches a second preset duration; the second driving signal is used for controlling the second switching tube to be conducted;the first switching tube is a main switching tube in a current voltage change mode of the voltage conversion circuit; the second switching tube is a switching tube used for forming a power supply loop with the main switching tube.
- The voltage conversion circuit of claim 7, wherein the second leg module further comprises a third switching tube;the control module is further configured to output a third driving signal to a third switching tube in the second bridge arm module when outputting the second driving signal to the second switching tube in the second bridge arm module, wherein the third driving signal is used for controlling the third switching tube to be constantly turned off.
- The voltage conversion circuit of claim 8, wherein the first leg module further comprises a fourth switching tube;the first end of the first switching tube is connected with a direct current power supply, and the second end of the first switching tube is connected with a first node;the first end of the fourth switching tube is connected with the first node, and the second end of the fourth switching tube is grounded;the first end of the second switching tube is used for being connected with the energy storage circuit, and the second end of the second switching tube is connected with the second node;the first end of the third switching tube is connected with the second node, and the second end of the third switching tube is grounded;one end of the inductor is connected with the first node, and the other end of the inductor is connected with the second node.
- An energy storage device comprising an energy storage circuit and the voltage conversion circuit of any of claims 7-9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/108451 WO2024020912A1 (en) | 2022-07-28 | 2022-07-28 | Voltage conversion circuit, control method, and energy storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117795837A true CN117795837A (en) | 2024-03-29 |
Family
ID=89704989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280004149.XA Pending CN117795837A (en) | 2022-07-28 | 2022-07-28 | Voltage conversion circuit, control method and energy storage device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117795837A (en) |
| WO (1) | WO2024020912A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015009791A (en) * | 2013-07-02 | 2015-01-19 | 本田技研工業株式会社 | Vehicle power supply device |
| CN111064365A (en) * | 2020-01-17 | 2020-04-24 | 东莞市恒信第三代半导体研究院 | Voltage reduction mode constant voltage control method and circuit of soft switch bidirectional direct current converter |
| CN113328626B (en) * | 2021-04-29 | 2022-06-17 | 武汉麦格米特电气有限公司 | Control method and controller of four-switch Buck-Boost converter and power supply equipment |
| CN114759786A (en) * | 2022-05-18 | 2022-07-15 | 连云港杰瑞电子有限公司 | Current control method and circuit of buck-boost converter |
-
2022
- 2022-07-28 CN CN202280004149.XA patent/CN117795837A/en active Pending
- 2022-07-28 WO PCT/CN2022/108451 patent/WO2024020912A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024020912A1 (en) | 2024-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI463777B (en) | Non-inverting buck boost voltage converter and method for controlling the same | |
| US9484758B2 (en) | Hybrid bootstrap capacitor refresh technique for charger/converter | |
| US8008898B2 (en) | Switching regulator with boosted auxiliary winding supply | |
| US7679341B2 (en) | External control mode step down switching regulator | |
| US20060072349A1 (en) | Forward converter with synchronous rectifier and reverse current control | |
| US20100039085A1 (en) | Buck boost function based on a capacitor bootstrap input buck converter | |
| CN102035379B (en) | Dc-dc converter | |
| JP6185860B2 (en) | Bidirectional converter | |
| TW201725837A (en) | Dual-constant-time buck-boost switching regulator and control circuit and method thereof | |
| CN111431386A (en) | Control method and control circuit for auxiliary power supply | |
| JP5721403B2 (en) | Buck-boost circuit and buck-boost circuit control method | |
| CN101447732A (en) | Reverse-current protector used for synchronous switched voltage converter | |
| JP3132614B2 (en) | DC-DC converter | |
| CN202737741U (en) | DC-DC booster circuit | |
| CN117795837A (en) | Voltage conversion circuit, control method and energy storage device | |
| CN219740344U (en) | Driving circuit taking NMOS as ideal diode | |
| CN114257066A (en) | Switch converter and control circuit thereof | |
| CN112803744B (en) | Low-power-consumption power supply starting control device and method and power supply equipment | |
| CN213185876U (en) | Power input circuit, ECU power circuit and vehicle | |
| CN219875492U (en) | Negative boost DC-DC converter | |
| CN113258784A (en) | Power supply circuit of switching power supply and control method thereof | |
| CN113300440A (en) | Battery power supply device and power supply method thereof | |
| CN112968606B (en) | ELVDD structure for AMOLED | |
| CN214412594U (en) | Boosting device and power supply equipment | |
| CN110932550B (en) | Voltage output circuit, switching power supply direct current converter and integrated circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |