WO2022165814A1 - Control method and apparatus for power converter, and storage medium - Google Patents
Control method and apparatus for power converter, and storage medium Download PDFInfo
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- WO2022165814A1 WO2022165814A1 PCT/CN2021/075879 CN2021075879W WO2022165814A1 WO 2022165814 A1 WO2022165814 A1 WO 2022165814A1 CN 2021075879 W CN2021075879 W CN 2021075879W WO 2022165814 A1 WO2022165814 A1 WO 2022165814A1
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- duty cycle
- switch tube
- arm switch
- voltage
- bridge arm
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000000295 complement effect Effects 0.000 claims abstract description 17
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- 238000004891 communication Methods 0.000 claims description 6
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- 239000003990 capacitor Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
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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
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Definitions
- the present application relates to the field of power electronic control, and in particular, to a control method, device and storage medium for a power converter.
- the four-switch DC/DC power converter can be regarded as a BUCK bridge arm and a BOOST bridge arm in series, and controlled according to the BUCK-BOOST (buck-boost) mode, and the output voltage can be achieved by adjusting the duty cycle.
- the switching loss is large and the efficiency is low due to the large-scale switching action of the four switches.
- embodiments of the present application provide a control method, device and storage medium for a power converter, which can conveniently and efficiently realize seamless switching of a four-switch DC/DC power converter and reduce switching losses.
- a first aspect of an embodiment of the present application provides a control method for a power converter.
- the power converter includes a step-down unit, a step-up unit, a voltage input unit, and a voltage output unit, and one end of the step-down unit is connected to the voltage input unit. unit, the other end of the step-down unit is connected to the step-up unit through an inductor, the other end of the step-up unit is connected to the voltage output unit, and the step-down unit includes a first upper bridge arm switch tube and a first lower bridge arm connected in series A switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, and the above method includes:
- the target duty cycle of the second upper arm switch tube determines the target duty cycle of the second upper arm switch tube, and control the first upper arm switch tube according to the target duty cycle
- the turn-on time is used to adjust the duty cycle of the first upper bridge arm switch tube, wherein the duty cycle of the first lower bridge arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube, and the second lower arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube.
- the duty cycle of the bridge arm switch is complementary to the duty cycle of the second upper bridge arm switch;
- the duty cycle of the first upper arm switch is fixed, and the on-time of the second lower arm switch is controlled until the input The voltage is less than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more.
- the on-time duration of the first high-side switch transistor is controlled according to the target duty cycle to adjust the duty cycle of the first high-side switch transistor, include:
- the adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the above-mentioned first The duty cycle of the switch tube of the second upper bridge arm;
- the on-time length of the first upper arm switch tube is controlled to adjust the duty ratio of the first upper arm switch tube.
- the above-mentioned fixing the duty cycle of the first upper bridge arm switch tube includes:
- the duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
- the above-mentioned controlling the on-time duration of the switch tube of the second lower bridge arm includes:
- the duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above
- the duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube.
- the on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
- the duty cycle of the second lower arm switch is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle .
- the above method further includes:
- the voltage gain of the output voltage is determined according to the duty cycle of the first high-side switch and the duty cycle of the second high-side switch.
- the present application provides a control device for a power converter
- the power converter includes a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, and one end of the step-down unit is connected to the voltage an input unit, the other end of the step-down unit is connected to the step-up unit through an inductor, the other end of the step-up unit is connected to the voltage output unit, and the step-down unit includes a first upper bridge arm switch tube and a first lower bridge connected in series An arm switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, and the device includes:
- a first determination module configured to determine the target duty cycle of the second upper-bridge switch tube when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit;
- a first control module configured to control the on-time length of the first upper bridge arm switch tube according to the above target duty cycle to adjust the duty cycle of the above first upper bridge arm switch tube, wherein the first lower bridge arm switch tube
- the duty cycle of the first upper bridge arm switch tube is complementary to that of the first upper bridge arm switch tube
- the duty cycle of the second lower bridge arm switch tube is complementary to the duty cycle of the second upper bridge arm switch tube
- a fixing module configured to fix the duty cycle of the first upper bridge arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit;
- the second control module is configured to control the on-time duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
- the above-mentioned first control module is also used for:
- the adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the second The duty cycle of the switch tube of the upper bridge arm;
- the on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
- the above-mentioned fixing module is used for:
- the duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
- the above-mentioned second control module is also used for:
- the duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above
- the duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube.
- the on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
- the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle .
- the above-mentioned device further includes:
- the second determination module is configured to determine the voltage gain of the output voltage according to the duty cycle of the first upper-bridge switch tube and the duty cycle of the second upper-bridge switch tube.
- the present application provides a computer device, including: a processor, a memory, and a network interface;
- the processor is connected to a memory and a network interface, wherein the network interface is used to provide a data communication function, the memory is used to store program codes, and the processor is used to call the program codes to execute the above-mentioned first in this application. Aspects and methods performed by any of the possible implementations of the first aspect.
- the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program includes program instructions that, when executed by a processor, execute the above-mentioned first step in the present application.
- the target duty cycle of the second upper arm switch is determined, and the first upper arm switch is controlled according to the above target duty cycle
- the on-time length of the transistor is used to adjust the duty cycle of the first upper bridge arm switch transistor.
- the above duty cycle coefficient is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the above-mentioned loop output duty cycle is equal to the first the duty cycle of the switch tube of the upper bridge arm, and control the on-time length of the second lower bridge arm according to the duty cycle of the switch tube of the second lower bridge arm, until the input voltage is less than the output voltage and the output voltage No more increase, the function of boosting is realized.
- This control strategy has only BUCK (buck) mode and BOOST (boost) mode, but no BUCK-BOOST (buck-boost) mode, which reduces switching loss, improves the efficiency of energy transmission, and is simpler and more convenient to realize. Seamless switching of operating modes of a four-switch DC/DC power converter.
- FIG. 1 is a schematic structural diagram of a four-switch DC/DC power converter provided by the present application
- Fig. 2 is the waveform simulation schematic diagram provided by the application.
- FIG. 3 is a schematic flowchart of a control method of a power converter provided by the present application.
- FIG. 4 is another schematic flowchart of a control method for a power converter provided by the present application.
- FIG. 5 is a schematic structural diagram of a control device for a power converter provided by the present application.
- FIG. 6 is another schematic structural diagram of a control device for a power converter provided by the present application.
- FIG. 7 is a schematic structural diagram of a computer device provided by the present application.
- the control method of the power converter provided by the present application can be applied to a four-switch DC/DC power converter.
- the above-mentioned four-switch DC/DC power converter is mainly used to convert the frequently fluctuating battery pack voltage into A stable voltage provides electric power for the electric vehicle drive system, thereby enhancing the stability of the electric vehicle drive system.
- the electric motor in the electric vehicle drive system is a typical active load, which can not only absorb the electrical energy of the battery pack and convert it into mechanical energy output, but also convert the mechanical energy into electrical energy and feed it back to the battery pack.
- the battery voltage varies greatly during the operation of the electric vehicle.
- the use of the above four-switch DC/DC power converter can stabilize the voltage of the battery pack at a relatively high voltage value within a certain load range, thereby significantly enhancing the stability of the above electric vehicle drive system.
- the use of the above-mentioned four-switch DC/DC power converter in an electric vehicle can optimize the motor control and improve the overall driving performance of the electric vehicle.
- the embodiment of the present application proposes a control method for a power converter, which is suitable for the above-mentioned four-switch DC/DC power converter, and can maintain the polarity of the DC voltage at both ends of the four-switch DC/DC power converter to be different.
- the two-way energy transmission is completed according to the actual needs, which reduces the switching loss, improves the efficiency of energy transmission, and realizes the seamless switching of the working mode of the four-switch DC/DC power converter more simply and conveniently.
- FIG. 1 is a schematic structural diagram of a four-switch DC/DC power converter.
- the four-switch DC/DC power converter includes: a step-down unit 1, a step-up unit 2, a voltage For the input unit 3 and the voltage output unit 4, one end of the step-down unit is connected to the voltage input unit, the other end of the step-down unit is connected to the step-up unit through the inductor 04, and the other end of the step-up unit is connected to the voltage output unit.
- the step-down unit includes a first upper-arm switch 031 and a first lower-arm switch 032 connected in series
- the boost unit includes a second upper-arm switch 034 and a second lower-arm switch 034 connected in series 033.
- the above-mentioned four-switch DC/DC power converter can realize bidirectional flow of energy, and there are two operating modes, including a battery discharge mode (that is, a buck (buck) mode) and a battery charging mode (That is, BOOST (boost mode).
- a battery discharge mode that is, a buck (buck) mode
- BOOST boost mode
- the above-mentioned voltage input unit may include a first DC power supply 011 and a first filter capacitor 021, and the above-mentioned voltage output unit may include a second DC power supply Power supply 012, second filter capacitor 022;
- the above-mentioned four-switch DC/DC power converter works in BUCK (buck) mode, the above-mentioned voltage input unit may include a second DC power supply 012, a second filter capacitor 022, and the above-mentioned voltage output
- the unit may include a first DC power supply 011 and a first filter capacitor 021 .
- the above-mentioned first filter capacitor 021 and second filter capacitor 022 are respectively connected in parallel with the output end of the first DC power supply 011 and the output end of the second DC power supply 012 to reduce the AC ripple coefficient and smooth the DC output.
- the filter capacitor not only stabilizes the DC output of the power supply and reduces the influence of the alternating ripple on the circuit, but also absorbs the current fluctuation generated during the operation of the circuit and the interference connected in series through the AC power supply, making the circuit more stable. Work performance is more stable.
- the above-mentioned second DC power supply 012 acts as a voltage input unit to the above-mentioned step-down unit and the above-mentioned booster unit.
- the voltage applied by the voltage unit is greater than the steady-state voltage of the first DC power supply 011 in the voltage output unit.
- the current of the inductor 04 flows from the right end of the inductor 04 to the left end of the inductor 04, and the inductor 04 is in an energy storage state.
- the voltage applied by the first DC power supply 011 as a voltage input unit to the step-down unit and the boost unit is smaller than the voltage output unit
- the steady-state voltage of the second DC power supply 012 in the middle at this time, the current of the inductor 04 flows from the left end of the inductor 04 to the right end of the inductor 04, and the inductor 04 is in a discharging state.
- the second lower arm switch tube 033 may be an insulated gate bipolar transistor or a power field effect transistor.
- Insulated Gate Bipolar Transistor (IGBT) has high operating frequency, low required driving power, low switching loss and fast switching speed, which can make the DC buck-boost circuit quickly realize the conversion between buck and boost.
- the power FET has fast switching speed, simple driving circuit and high operating frequency.
- both the first upper bridge arm switch tube 031 in the aforementioned step-down unit and the second lower bridge arm switch tube 033 in the aforementioned step-up unit can be turned on respectively under the action of the pulse width modulation signal applied by the controller and shutdown.
- the above-mentioned controller may be a pulse width modulation (Pulse Width Modulation, PWM) controller (or a pulse width modulator), which modulates the above-mentioned semiconductor power switching device (such as an insulated bipolar transistor according to the change of the corresponding load). ) of the base or gate bias to achieve the change of the on-time and thus the change of the duty cycle.
- PWM Pulse Width Modulation
- the above-mentioned pulse width modulator is also a very effective controller that uses the digital signal of the microprocessor to control the analog circuit.
- a series of pulses of equal amplitude are obtained at the terminal, and these pulses are used to replace the sine wave or the desired waveform. That is, multiple pulses are generated in the half cycle of the output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output waveform is smooth and has few low-order harmonics.
- the output voltage of the circuit can be changed, and the output frequency can also be changed.
- the controller uses the pulse width modulation applied to the first high-side switch in the step-down unit and the second low-side switch in the step-up unit.
- the signal realizes that the above-mentioned switch tubes are turned on and off respectively to control the duty ratio of the above-mentioned first upper bridge arm switch tube and the above-mentioned second lower bridge arm switch tube, so as to realize the above-mentioned four-switch DC/DC power converter from BUCK ( The seamless switching from buck) mode to BOOST (boost) mode changes the flow direction of the inductor current, so that the inductor switches repeatedly between the energy storage state and the energy discharge state, completing the bidirectional transmission of energy, and the output voltage remains at In the steady state, the functions of stabilizing the voltage of the battery pack within a certain range and repeatedly charging the battery pack in the electric vehicle can be realized.
- FIG. 2 is a schematic diagram of waveform simulation. As shown in FIG. 2 , the output voltage waveform and the inductor current waveform are sequentially from top to bottom.
- the above-mentioned output voltage waveform is a fixed value. In practical applications, the above-mentioned output voltage reference value can be set according to different situations, and the input voltage can be controlled by the step-down unit 1 in FIG. 1 and the step-up unit in FIG. 1 above. In 2, the on or off of the switch tubes of each bridge arm reaches the reference value of the output voltage, and the output voltage of the DC power supply is kept constant when the working conditions change.
- the above pulse width modulator controls the above bridges by sending pulse width modulation signals to the buck unit 1 in FIG.
- the arm switch tube is turned on or off, realizing the function of repeatedly charging and discharging the inductor.
- a method for controlling a power converter, a control device for a power converter, and a computer device of the present application will be described below with reference to FIGS. 3 to 7 .
- FIG. 3 is a schematic flowchart of a control method for a power converter provided by the present application.
- a method for controlling a power converter provided by an embodiment of the present application is applicable to a four-switch DC/DC power converter.
- For the structure of the above-mentioned four-switch DC/DC power converter please refer to the schematic structural diagram described in FIG. 1 , here It will not be repeated here.
- a method for controlling a power converter provided by an embodiment of the present application may include the steps:
- the four-switch DC/DC power converter works in BUCK (buck) mode;
- the target duty cycle of the second upper bridge arm is determined.
- the target duty cycle is the upper limit of the duty cycle of the first upper bridge arm switch tube adjusted by the subsequent pulse width modulator.
- the target of the second high-arm switch tube in the above-mentioned boost unit can be changed to
- the duty cycle is set to a certain threshold (such as 0.99), and 0.99 is set as the subsequent pulse width modulator to control the conduction time of the first upper bridge arm switch in the above-mentioned step-down unit to adjust the above-mentioned first upper bridge arm The upper limit of the duty cycle of the switch tube.
- the four-switch power converter works in a buck (buck) mode, and the controller takes a duty cycle according to the target The ratio determines the adjustment range of the duty cycle of the first upper bridge arm switch tube.
- the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the target duty cycle of the second high-arm switch tube.
- the on-time duration of the first upper arm switch tube is controlled to adjust the duty cycle of the first upper arm switch tube.
- the pulse width modulator converts the above-mentioned first upper bridge arm according to the above-mentioned target duty cycle
- the duty cycle range of the switch tube is determined to be greater than 0 and less than or equal to 0.99.
- the pulse width modulator sends a pulse width modulation signal to the first upper bridge arm switch tube to control the on-time length of the first upper bridge arm switch tube to adjust the duty cycle of the first upper bridge arm switch tube.
- the ratio increases from 0 to 0.99.
- the pulse width modulator controls the duty cycle of the first high-arm switch to reach 0.99
- the input voltage of the voltage input unit in the four-switch DC/DC power converter is equal to the output voltage of the voltage output unit.
- the wide modulator stops the control of the above-mentioned first upper bridge arm switch tube, the BUCK (buck) mode ends, and the above-mentioned four-switch DC/DC power converter also realizes the conversion of the working mode to the BOOST (boost) mode. .
- the controller fixes the duty cycle of the first upper bridge arm switch tube according to the second upper bridge The duty cycle of the duty cycle adjustment of the arm switch tube.
- the BUCK (buck) mode ends, and the above-mentioned four-switch DC/DC power converter enters the BOOST (boost) mode.
- the above-mentioned pulse width modulator controls the conduction of the above-mentioned first high-arm switch tube The duration is adjusted to adjust the duty cycle of the first upper bridge arm switch tube to 0.99. And when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the first upper bridge arm switch tube is fixed at 0.99, and the control of the first upper bridge arm switch tube is stopped, At this point, the BUCK (buck) mode ends.
- S104 Control the on-time duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
- the four-switch DC/DC power converter enters a BOOST (boost) mode.
- the duty cycle of the loop output of the /DC power converter and the duty cycle coefficient determine the duty cycle of the second lower arm switch tube.
- the duty cycle factor is the duty cycle of the first upper arm switch tube and the duty ratio of the first lower arm switch tube
- the difference value of the above-mentioned loop output duty ratio is equal to the duty ratio of the above-mentioned first upper bridge arm switch tube
- the conduction of the above-mentioned second lower bridge arm switch tube is controlled according to the above-mentioned duty ratio of the above-mentioned second lower bridge arm switch tube until the input voltage is smaller than the output voltage and the output voltage does not increase any more.
- the controller controls the duty cycle adjustment range of the second lower arm switch tube to be smaller than the target duty cycle and the duty cycle factor The sum is greater than or equal to the above target duty cycle.
- the four-switch DC/DC power converter enters the BOOST mode, and at this time The pulse width modulator starts to adjust the duty ratio of the switch tube of the second lower bridge arm.
- the duty cycle of the second lower arm switch tube is determined by the loop output duty cycle and the duty cycle coefficient.
- the duty cycle of the loop output here is 0.99 when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit.
- the above duty cycle factor is the difference between the duty cycle of the first upper arm switch tube and the duty cycle of the first lower arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit .
- the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube are complementary. Therefore, when the duty cycle of the first upper bridge arm switch tube is 0.99, the above The duty ratio of the switch tube of the first lower arm is 0.01. It can be understood that the duty ratio here is 0.98.
- the duty cycle of the switch tube of the second lower arm when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the switch tube of the second lower arm is the same as that of the four-switch DC/DC power converter. The difference between the loop output of 0.99 and the above duty cycle factor of 0.98 is 0.01.
- the pulse width modulator sends a pulse width modulation signal to the second lower arm switch tube according to the duty ratio of the second lower arm switch tube to control the on-time length of the second lower arm switch tube until the above
- the input voltage is smaller than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more.
- the pulse width modulator controls the duty cycle of the second lower arm switch tube to gradually increase from 0.01, and the on-time duration of the second lower arm switch tube gradually increases, the output voltage of the voltage output unit also gradually increases. Increase.
- the four-switch DC/DC power converter enters the BOOST (boost) mode, until the pulse width modulator reaches the upper limit of the adjustment range when operating in the BOOST (boost) mode, the pulse width modulator stops the second lower bridge arm.
- the control of the switch tube at this time, the output voltage of the above-mentioned voltage output unit reaches the maximum value and does not increase any more.
- the duty cycle adjustment range of the second lower arm switch tube is greater than or equal to 0.99 and less than 1.97.
- the target duty cycle of the second upper arm switch is determined, and the first upper arm switch is controlled according to the above target duty cycle
- the on-time length of the transistor is used to adjust the duty cycle of the first upper bridge arm switch transistor.
- the above duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the above loop output duty cycle is equal to the first upper bridge arm
- the duty cycle of the switch tube of the arm switch and control the on-time of the second lower arm according to the duty cycle of the switch tube of the second lower arm, until the input voltage is less than the output voltage and the output voltage is no longer Increase, to achieve the function of boost.
- This control strategy only has BUCK (buck) mode and BOOST (boost) mode, and there is no BUCK-BOOST (buck-boost) mode.
- the tube sends the pulse width modulation signal to quickly realize the seamless switching of the working mode of the four-switch DC/DC converter, which is simple to implement, reduces the switching loss and improves the efficiency of energy transmission.
- FIG. 4 is another schematic flowchart of a control method for a power converter provided by the present application.
- the method may be performed by a computer device.
- the method shown in Figure 4 may include the following steps:
- step S201 may refer to the description of step S101 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
- step S202 may refer to the description of step S102 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
- step S203 may refer to the description of step S103 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
- step S204 For the specific implementation of this step S204, reference may be made to the description of step S104 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
- S205 Determine the voltage gain of the output voltage according to the duty cycle of the first high-arm switch tube and the duty cycle of the second high-arm switch tube.
- the voltage gain of the output voltage is the voltage of the output voltage unit divided by the voltage of the input voltage unit
- the first bridge arm voltage is the duty cycle of the first upper bridge arm switch tube multiplied by the voltage of the input voltage unit
- the voltage of the second bridge arm is the duty cycle of the second upper bridge arm switch tube multiplied by the voltage of the output voltage unit.
- the voltage gain of the above-mentioned output voltage is the duty ratio of the above-mentioned first high-arm switch tube divided by the above-mentioned duty ratio of the above-mentioned second high-arm switch tube.
- the duty cycle of the first high-side switch tube and the duty cycle of the second high-side switch tube are adjusted to make the output voltage
- the voltage gain is less than 1 and greater than 0; when the voltage of the input voltage unit is equal to the voltage of the output voltage unit, adjust the duty cycle of the first upper bridge arm switch tube and the duty cycle of the second upper bridge arm switch tube In order to make the voltage gain of the output voltage equal to 1; when the voltage of the input voltage unit is less than the voltage of the output voltage unit, adjust the duty cycle of the first upper bridge arm switch tube and the second upper bridge arm switch tube. duty cycle so that the voltage gain of the output voltage is greater than one.
- FIG. 5 is a schematic structural diagram of a control device for a power converter provided by the present application.
- the control device of the power converter can be a computer program (including program code) running in the computer equipment, for example, the control device of the power converter is an application software; the control device of the power converter can be used to execute the present invention.
- the corresponding steps in the method provided by the application As shown in FIG.
- the power converter includes: a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, one end of the step-down unit is connected to the voltage input unit, and the other end of the step-down unit is connected through an inductor
- the above control device includes: a first determination module 10 , a first control module 20 , a fixing module 30 , and a second control module 40 .
- a first determination module 10 configured to determine the target duty cycle of the second upper-bridge switch tube when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit;
- the first control module 20 is configured to control the on-time length of the first high-arm switch tube according to the target duty cycle determined by the first determination module 10 to adjust the duty cycle of the first high-arm switch tube, wherein
- the duty ratio of the first lower arm switch is complementary to the duty ratio of the first upper arm switch, and the duty ratio of the second lower arm switch is the same as the duty ratio of the second upper arm switch.
- the fixing module 30 is configured to fix the duty cycle of the first upper bridge arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit;
- the second control module 40 is configured to control the conduction duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
- the above-mentioned first control module 10 is further configured to:
- the adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the second The duty cycle of the switch tube of the upper bridge arm;
- the on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
- the above-mentioned fixing module 30 is used for:
- the duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
- the above-mentioned second control module 40 is further configured to:
- the duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above
- the duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube.
- the on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
- the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle.
- the above-mentioned device further includes:
- the second determination module 50 is configured to determine the voltage gain of the output voltage according to the duty cycle of the first high-arm switch and the duty cycle of the second high-arm switch.
- the specific implementation manner of the first determination module 10 , the first control module 20 , the fixing module 30 , the second control module 40 and the second determination module 50 can be referred to the steps S101 to S104 in the embodiment corresponding to FIG. 3 above. , and/or the description of step S201 to step S205 in the above-mentioned embodiment corresponding to FIG. 4 , which will not be repeated here. In addition, the description of the beneficial effects of using the same method will not be repeated.
- the computer device 1000 may include: at least one processor 1001 , such as a CPU, at least one network interface 1003 , memory 1004 , and at least one communication bus 1002 .
- the communication bus 1002 is used to realize the connection and communication between these components.
- the network interface 1003 may optionally include a standard wired interface and a wireless interface (eg, a WI-FI interface).
- the memory 1004 may be a high-speed random access memory (RAM) memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory.
- the memory 1004 can optionally also be at least one storage device located remotely from the aforementioned processor 1001 .
- the memory 1004 which is a computer storage medium, may include an operating system, a network communication module, and a device control application program.
- the processor 1001 can be used to call the device control application program stored in the memory 1004 to realize:
- the target duty cycle of the second upper arm switch tube determines the target duty cycle of the second upper arm switch tube, and control the first upper arm switch tube according to the target duty cycle
- the turn-on time is used to adjust the duty cycle of the first upper bridge arm switch tube, wherein the duty cycle of the first lower bridge arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube, and the second lower arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube.
- the duty cycle of the bridge arm switch is complementary to the duty cycle of the second upper bridge arm switch;
- the duty cycle of the first upper arm switch is fixed, and the on-time of the second lower arm switch is controlled until the input The voltage is less than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more.
- the above-mentioned controlling the on-time duration of the first upper bridge arm switch tube according to the target duty ratio to adjust the duty ratio of the aforementioned first upper bridge arm switch tube includes:
- the adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the above-mentioned first The duty cycle of the switch tube of the second upper bridge arm;
- the on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
- the above-mentioned fixing the duty cycle of the switch tube of the first upper bridge arm includes:
- the duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
- the above-mentioned controlling the on-time duration of the switch tube of the second lower bridge arm includes:
- the duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above
- the duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube.
- the on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
- the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle.
- the above method further includes:
- the voltage gain of the output voltage is determined according to the duty cycle of the first high-side switch and the duty cycle of the second high-side switch.
- the present application also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program executed by a control device of the aforementioned power converter, and
- the computer program includes program instructions, and when the processor executes the program instructions, it can execute the description of the control method for a power converter in the embodiment corresponding to FIG. 3 and/or FIG. 4 .
- the description of the beneficial effects of using the same method will not be repeated.
- program instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site.
- the computer-readable storage medium may be a control device of a power converter provided in any of the foregoing embodiments or an internal storage unit of the above-mentioned device, such as a hard disk or a memory of an electronic device.
- the computer-readable storage medium can also be an external storage device of the electronic device, such as a pluggable hard disk, a smart media card (SMC), a secure digital (SD) card equipped on the electronic device, Flash card (flash card), etc.
- the above-mentioned computer-readable storage medium may also include a magnetic disk, an optical disk, a read-only memory (read-only memory, ROM) or a random access memory, and the like.
- the computer-readable storage medium may also include both an internal storage unit of the electronic device and an external storage device.
- the computer-readable storage medium is used to store the computer program and other programs and data required by the electronic device.
- the computer-readable storage medium can also be used to temporarily store data that has been or will be output.
- circuits and methods may also be implemented in other manners.
- the device embodiments described above are illustrative.
- the division of circuit modules is only a logical function division. In actual implementation, there may be other division methods.
- multiple modules or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
- Each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
- the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
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Abstract
Disclosed in the present application are a control method and apparatus for a power converter, and a storage medium. The method comprises: when the input voltage of a voltage input unit is greater than the output voltage of a voltage output unit, determining a target duty cycle of a second upper bridge arm switching transistor, and according to the target duty cycle, controlling the turn-on duration of a first upper bridge arm switching transistor to adjust the duty cycle of the first upper bridge arm switching transistor, wherein the duty cycle of a first lower bridge arm switching transistor is complementary to the duty cycle of the first upper bridge arm switching transistor, and the duty cycle of a second lower arm switching transistor is complementary to the duty cycle of the second upper bridge arm switching transistor; when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, fixing the duty cycle of the first upper bridge arm switching transistor, and controlling the turn-on duration of the second lower arm switching transistor until the input voltage is less than the output voltage and the output voltage no longer increases. By using the present application, seamless switching of a four-switch DC/DC power converter can be conveniently and efficiently implemented, and switching loss can be reduced.
Description
本申请涉及电力电子控制领域,尤其涉及一种功率变换器的控制方法、装置及存储介质。The present application relates to the field of power electronic control, and in particular, to a control method, device and storage medium for a power converter.
四开关DC/DC功率变换器由于其开关器件少,可实现能量双向流动,在无需隔离的应用场合得到了广泛应用。四开关DC/DC功率变换器虽然只有四个开关器件但是控制策略却异常复杂,例如可以根据输入电压和输出电压的关系将整个控制区域划分为BUCK、BUCK-BOOST、BOOST三种模式,并随着模式的切换完成输出电压的调节,但这种控制策略中三种模式在切换时会存在交叉部分,导致功率变换器的控制性能降低。又例如可以将四开关DC/DC功率变换器看成一个BUCK桥臂和一个BOOST桥臂串联,并按照BUCK-BOOST(降压-升压)模式来进行控制,通过调节占空比实现输出电压的调节,但是在这种控制策略中由于四个开关管在进行大范围的开关动作,开关损耗大且效率低下。Four-switch DC/DC power converters are widely used in applications that do not require isolation because of their few switching devices and can realize bidirectional flow of energy. Although the four-switch DC/DC power converter has only four switching devices, the control strategy is very complicated. For example, the entire control area can be divided into three modes: BUCK, BUCK-BOOST, and BOOST according to the relationship between the input voltage and the output voltage. However, in this control strategy, there will be a cross section when the three modes are switched, resulting in a decrease in the control performance of the power converter. For another example, the four-switch DC/DC power converter can be regarded as a BUCK bridge arm and a BOOST bridge arm in series, and controlled according to the BUCK-BOOST (buck-boost) mode, and the output voltage can be achieved by adjusting the duty cycle. However, in this control strategy, the switching loss is large and the efficiency is low due to the large-scale switching action of the four switches.
发明内容SUMMARY OF THE INVENTION
基于上述问题,本申请实施例提供一种功率变换器的控制方法、装置及存储介质,可以方便、高效的实现四开关DC/DC功率变换器的无缝切换,减少开关损耗。Based on the above problems, embodiments of the present application provide a control method, device and storage medium for a power converter, which can conveniently and efficiently realize seamless switching of a four-switch DC/DC power converter and reduce switching losses.
本申请实施例第一方面提供一种功率变换器的控制方法,上述功率变换器中包括:降压单元、升压单元、电压输入单元和电压输出单元,上述降压单元的一端连接上述电压输入单元,上述降压单元的另一端通过电感连接上述升压单元,上述升压单元的另一端连接上述电压输出单元,上述降压单元包括串联的第一上桥臂开关管和第一下桥臂开关管,上述升压单元包括串联的第二上桥臂开关管以及第二下桥臂开关管,上述方法包括:A first aspect of an embodiment of the present application provides a control method for a power converter. The power converter includes a step-down unit, a step-up unit, a voltage input unit, and a voltage output unit, and one end of the step-down unit is connected to the voltage input unit. unit, the other end of the step-down unit is connected to the step-up unit through an inductor, the other end of the step-up unit is connected to the voltage output unit, and the step-down unit includes a first upper bridge arm switch tube and a first lower bridge arm connected in series A switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, and the above method includes:
当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,确定上述第二上桥臂开关管的目标占空比,并根据上述目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,其中上述第一下桥臂开关管的占空比与上述第一上桥臂开关管的占空比互补,上述第二下桥臂开关管的占空比与上述第二上桥臂开关管的占空比互补;When the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit, determine the target duty cycle of the second upper arm switch tube, and control the first upper arm switch tube according to the target duty cycle The turn-on time is used to adjust the duty cycle of the first upper bridge arm switch tube, wherein the duty cycle of the first lower bridge arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube, and the second lower arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube. The duty cycle of the bridge arm switch is complementary to the duty cycle of the second upper bridge arm switch;
当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,固定上述第一上桥臂开关管的占空比,并控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。When the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the first upper arm switch is fixed, and the on-time of the second lower arm switch is controlled until the input The voltage is less than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more.
结合第一方面,在一种可能的实施方式中,上述根据所述目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,包括:With reference to the first aspect, in a possible implementation manner, the on-time duration of the first high-side switch transistor is controlled according to the target duty cycle to adjust the duty cycle of the first high-side switch transistor, include:
根据上述目标占空比确定所述第一上桥臂开关管的占空比的调节范围,其中,上述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于上述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the above-mentioned first The duty cycle of the switch tube of the second upper bridge arm;
根据上述第一上桥臂开关管的占空比的调节范围控制上述第一上桥臂开关管的导通时 长以调节上述第一上桥臂开关管的占空比。According to the adjustment range of the duty ratio of the first upper arm switch tube, the on-time length of the first upper arm switch tube is controlled to adjust the duty ratio of the first upper arm switch tube.
结合第一方面,在一种可能的实施方式中,上述固定所述第一上桥臂开关管的占空比包括:With reference to the first aspect, in a possible implementation manner, the above-mentioned fixing the duty cycle of the first upper bridge arm switch tube includes:
根据上述目标占空比固定上述第一上桥臂开关管的占空比,其中上述第一上桥臂开关管的占空比与上述目标占空比相同。The duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
结合第一方面,在一种可能的实施方式中,上述控制上述第二下桥臂开关管的导通时长,包括:With reference to the first aspect, in a possible implementation manner, the above-mentioned controlling the on-time duration of the switch tube of the second lower bridge arm includes:
根据上述功率变换器的环路输出占空比和占空比系数确定上述第二下桥臂开关管的占空比,其中上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述占空比系数为上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值,上述环路输出占空比等于上述第一上桥臂开关管的占空比;The duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above The duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube. duty cycle;
根据上述第二下桥臂开关管的占空比控制上述第二下桥臂开关管的导通时长。The on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
结合第一方面,在一种可能的实施方式中,上述第二下桥臂开关管的占空比小于上述目标占空比与上述占空比系数之和,且大于或等于上述目标占空比。With reference to the first aspect, in a possible implementation manner, the duty cycle of the second lower arm switch is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle .
结合第一方面,在一种可能的实施方式中,上述方法还包括:In conjunction with the first aspect, in a possible implementation, the above method further includes:
根据上述第一上桥臂开关管的占空比以及上述第二上桥臂开关管的占空比确定上述输出电压的电压增益。The voltage gain of the output voltage is determined according to the duty cycle of the first high-side switch and the duty cycle of the second high-side switch.
第二方面,本申请提供了一种功率变换器的控制装置,所述功率变换器中包括:降压单元、升压单元、电压输入单元和电压输出单元,上述降压单元的一端连接上述电压输入单元,上述降压单元的另一端通过电感连接上述升压单元,上述升压单元的另一端连接上述电压输出单元,上述降压单元包括串联的第一上桥臂开关管和第一下桥臂开关管,上述升压单元包括串联的第二上桥臂开关管以及第二下桥臂开关管,所述装置包括:In a second aspect, the present application provides a control device for a power converter, the power converter includes a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, and one end of the step-down unit is connected to the voltage an input unit, the other end of the step-down unit is connected to the step-up unit through an inductor, the other end of the step-up unit is connected to the voltage output unit, and the step-down unit includes a first upper bridge arm switch tube and a first lower bridge connected in series An arm switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, and the device includes:
第一确定模块,用于当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,确定上述第二上桥臂开关管的目标占空比;a first determination module, configured to determine the target duty cycle of the second upper-bridge switch tube when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit;
第一控制模块,用于根据上述目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,其中上述第一下桥臂开关管的占空比与上述第一上桥臂开关管的占空比互补,上述第二下桥臂开关管的占空比与上述第二上桥臂开关管的占空比互补;a first control module, configured to control the on-time length of the first upper bridge arm switch tube according to the above target duty cycle to adjust the duty cycle of the above first upper bridge arm switch tube, wherein the first lower bridge arm switch tube The duty cycle of the first upper bridge arm switch tube is complementary to that of the first upper bridge arm switch tube, and the duty cycle of the second lower bridge arm switch tube is complementary to the duty cycle of the second upper bridge arm switch tube;
固定模块,用于当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,固定上述第一上桥臂开关管的占空比;a fixing module, configured to fix the duty cycle of the first upper bridge arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit;
第二控制模块,用于控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。The second control module is configured to control the on-time duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
结合第二方面,在一种可能的实施方式中,上述第一控制模块,还用于:In combination with the second aspect, in a possible implementation manner, the above-mentioned first control module is also used for:
根据上述目标占空比确定上述第一上桥臂开关管的占空比的调节范围,其中,上述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于上述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the second The duty cycle of the switch tube of the upper bridge arm;
根据上述第一上桥臂开关管的占空比的调节范围控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。The on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
结合第二方面,在一种可能的实施方式中,上述固定模块用于:In combination with the second aspect, in a possible implementation manner, the above-mentioned fixing module is used for:
根据上述目标占空比固定上述第一上桥臂开关管的占空比,其中上述第一上桥臂开关管的占空比与上述目标占空比相同。The duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
结合第二方面,在一种可能的实施方式中,上述第二控制模块,还用于:In combination with the second aspect, in a possible implementation manner, the above-mentioned second control module is also used for:
根据上述功率变换器的环路输出占空比和占空比系数确定上述第二下桥臂开关管的占空比,其中上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述占空比系数为上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值,上述环路输出占空比等于上述第一上桥臂开关管的占空比;The duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above The duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube. duty cycle;
根据上述第二下桥臂开关管的占空比控制上述第二下桥臂开关管的导通时长。The on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
结合第二方面,在一种可能的实施方式中,上述第二下桥臂开关管的占空比小于上述目标占空比与上述占空比系数之和,且大于或等于上述目标占空比。With reference to the second aspect, in a possible implementation manner, the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle .
结合第二方面,在一种可能的实施方式中,上述装置还包括:In combination with the second aspect, in a possible implementation manner, the above-mentioned device further includes:
第二确定模块,用于根据上述第一上桥臂开关管的占空比以及上述第二上桥臂开关管的占空比确定上述输出电压的电压增益。The second determination module is configured to determine the voltage gain of the output voltage according to the duty cycle of the first upper-bridge switch tube and the duty cycle of the second upper-bridge switch tube.
第三方面,本申请提供了一种计算机设备,包括:处理器、存储器以及网络接口;In a third aspect, the present application provides a computer device, including: a processor, a memory, and a network interface;
所述处理器与存储器以及网络接口相连,其中,网络接口用于提供数据通信功能,所述存储器用于存储程序代码,所述处理器用于调用所述程序代码,以执行本申请中上述第一方面以及第一方面中任一种可能的实施方式所执行的方法。The processor is connected to a memory and a network interface, wherein the network interface is used to provide a data communication function, the memory is used to store program codes, and the processor is used to call the program codes to execute the above-mentioned first in this application. Aspects and methods performed by any of the possible implementations of the first aspect.
第四方面,本申请提供了一种计算机可读存储介质,该计算机可读存储介质存储有计算机程序,该计算机程序包括程序指令,该程序指令当被处理器执行时,执行本申请中上述第一方面以及第一方面中任一种可能的实施方式所执行的方法。In a fourth aspect, the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program includes program instructions that, when executed by a processor, execute the above-mentioned first step in the present application. A method performed by an aspect and any possible implementation of the first aspect.
在本申请中,通过在电压输入单元的输入电压大于电压输出单元的输出单元时,确定第二上桥臂开关管的目标占空比,并根据上述目标占空比控制第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。在电压输入单元的输入电压等于电压输出单元的输出电压时,固定第一上桥臂开关管的占空比,根据功率变换器的环路输出占空比系数确定第二下桥臂开关管的占空比,其中上述占空比系数为系数为第一上桥臂开关管的占空比与第一下桥臂开关管的占空比的差值,上述环路输出占空比等于第一上桥臂开关管的占空比,并根据所述第二下桥臂开关管的占空比控制所述第二下桥臂的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加,实现了升压的功能。这种控制策略只有BUCK(降压)模式和BOOST(升压)模式,没有BUCK-BOOST(降压-升压)模式,降低了开关损耗、提高了能量传输的效率、更简单方便的实现了四开关DC/DC功率变换器工作模式的无缝切换。In the present application, when the input voltage of the voltage input unit is greater than the output unit of the voltage output unit, the target duty cycle of the second upper arm switch is determined, and the first upper arm switch is controlled according to the above target duty cycle The on-time length of the transistor is used to adjust the duty cycle of the first upper bridge arm switch transistor. When the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the switch tube of the first upper bridge arm is fixed, and the duty ratio of the switch tube of the second lower arm arm is determined according to the duty cycle coefficient of the loop output of the power converter. duty cycle, wherein the above duty cycle coefficient is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the above-mentioned loop output duty cycle is equal to the first the duty cycle of the switch tube of the upper bridge arm, and control the on-time length of the second lower bridge arm according to the duty cycle of the switch tube of the second lower bridge arm, until the input voltage is less than the output voltage and the output voltage No more increase, the function of boosting is realized. This control strategy has only BUCK (buck) mode and BOOST (boost) mode, but no BUCK-BOOST (buck-boost) mode, which reduces switching loss, improves the efficiency of energy transmission, and is simpler and more convenient to realize. Seamless switching of operating modes of a four-switch DC/DC power converter.
图1是本申请提供的一种四开关DC/DC功率变换器的结构示意图;1 is a schematic structural diagram of a four-switch DC/DC power converter provided by the present application;
图2是本申请提供的波形仿真示意图;Fig. 2 is the waveform simulation schematic diagram provided by the application;
图3是本申提供的一种功率变换器的控制方法的一流程示意图;3 is a schematic flowchart of a control method of a power converter provided by the present application;
图4是本申请提供的一种功率变换器的控制方法的另一流程示意图;4 is another schematic flowchart of a control method for a power converter provided by the present application;
图5是本申请提供的一种功率变换器的控制装置的一结构示意图;5 is a schematic structural diagram of a control device for a power converter provided by the present application;
图6是本申请提供的一种功率变换器的控制装置的另一结构示意图;6 is another schematic structural diagram of a control device for a power converter provided by the present application;
图7是本申请提供的计算机设备的结构示意图。FIG. 7 is a schematic structural diagram of a computer device provided by the present application.
下面将结合本申请中的附图,对本申请中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。The technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
本申请提供的功率变换器的控制方法可以适用于四开关DC/DC功率变换器,上述四开关DC/DC功率变换器应用在电动汽车中时,主要用于将频繁波动的蓄电池组电压变换成一个稳定的电压为电动汽车驱动系统提供电能,从而增强了电动汽车驱动系统的稳定性。这是因为,电动汽车驱动系统中的电动机是典型的有源负载,它既可以吸收蓄电池组电能将其转化为机械能输出,也可以将机械能转换为电能反馈回蓄电池组。但是由于电动汽车中的电动机的转速范围很宽,所以电动汽车运行的过程中蓄电池电压的变化范围也很大,在这样的条件下如果用蓄电池组直接驱动电动机运转,会造成电动机驱动性能的恶化。而使用上述四开关DC/DC功率变换器可以将蓄电池组的电压在一定的负载范围内稳定在一个相对较高的电压值,从而可以明显增强上述电动汽车驱动系统的稳定性。电动汽车采用上述四开关DC/DC功率变换器可以优化电动机控制、提高电动汽车整体的驱动性能。本申请实施例在此基础上提出了一种功率变换器的控制方法,适用于上述四开关DC/DC功率变换器,其可以在保持四开关DC/DC功率变换器两端的直流电压极性不变的情况下,根据实际需要完成能量双向传输的,降低了开关损耗、提高了能量传输的效率、更简单方便的实现了四开关DC/DC功率变换器工作模式的无缝切换。The control method of the power converter provided by the present application can be applied to a four-switch DC/DC power converter. When the above-mentioned four-switch DC/DC power converter is applied in an electric vehicle, it is mainly used to convert the frequently fluctuating battery pack voltage into A stable voltage provides electric power for the electric vehicle drive system, thereby enhancing the stability of the electric vehicle drive system. This is because the electric motor in the electric vehicle drive system is a typical active load, which can not only absorb the electrical energy of the battery pack and convert it into mechanical energy output, but also convert the mechanical energy into electrical energy and feed it back to the battery pack. However, due to the wide speed range of the electric motor in the electric vehicle, the battery voltage varies greatly during the operation of the electric vehicle. Under such conditions, if the electric motor is directly driven by the battery pack, the driving performance of the electric motor will deteriorate. . The use of the above four-switch DC/DC power converter can stabilize the voltage of the battery pack at a relatively high voltage value within a certain load range, thereby significantly enhancing the stability of the above electric vehicle drive system. The use of the above-mentioned four-switch DC/DC power converter in an electric vehicle can optimize the motor control and improve the overall driving performance of the electric vehicle. On this basis, the embodiment of the present application proposes a control method for a power converter, which is suitable for the above-mentioned four-switch DC/DC power converter, and can maintain the polarity of the DC voltage at both ends of the four-switch DC/DC power converter to be different. Under the changing circumstances, the two-way energy transmission is completed according to the actual needs, which reduces the switching loss, improves the efficiency of energy transmission, and realizes the seamless switching of the working mode of the four-switch DC/DC power converter more simply and conveniently.
请参见图1,图1为一种四开关DC/DC功率变换器的结构示意图,如图1所示,上述四开关DC/DC功率变换器包括:降压单元1、升压单元2、电压输入单元3和电压输出单元4,上述降压单元的一端连接上述电压输入单元,上述降压单元的另一端通过电感04连接上述升压单元,上述升压单元的另一端连接上述电压输出单元。其中,上述降压单元包括串联的第一上桥臂开关管031和第一下桥臂开关管032,上述升压单元包括串联的第二上桥臂开关管034以及第二下桥臂开关管033。在本申请可选的实施例中,上述四开关DC/DC功率变换器可实现能量的双向流动,存在两种工作模式,包括电池放电模式(即BUCK(降压)模式)和电池充电模式(即BOOST(升压)模式)。其中,当上述四开关DC/DC功率变换器工作在BOOST(升压)模式时,上述电压输入单元可以包括第一直流电源011、第一滤波电容021,上述电压输出单元可以包括第二直流电源012、第二滤波电容022;当上述四开关DC/DC功率变换器工作在BUCK(降压)模式时,上述电压输入单元可以包括第二直流电源012、第二滤波电容022,上述电压输出单元可以包括第一直流电源011、第一滤波电容021。上述第一滤波电容021、第二滤波电容022分别并联在第一直流电源011输出端以及第二直流电源012输出端,用以降低交流脉动波纹系数、平滑直流输出,在使用将交流转换为直流供电的电路中,滤波电容不仅使电源直流输出平稳,降低了交变脉动波纹对电路的影响,同时还可吸收电路工作过程中产生的电流波动和经由交流电源串入的干扰,使得电路的工作性能更加稳定。Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a four-switch DC/DC power converter. As shown in FIG. 1, the four-switch DC/DC power converter includes: a step-down unit 1, a step-up unit 2, a voltage For the input unit 3 and the voltage output unit 4, one end of the step-down unit is connected to the voltage input unit, the other end of the step-down unit is connected to the step-up unit through the inductor 04, and the other end of the step-up unit is connected to the voltage output unit. The step-down unit includes a first upper-arm switch 031 and a first lower-arm switch 032 connected in series, and the boost unit includes a second upper-arm switch 034 and a second lower-arm switch 034 connected in series 033. In an optional embodiment of the present application, the above-mentioned four-switch DC/DC power converter can realize bidirectional flow of energy, and there are two operating modes, including a battery discharge mode (that is, a buck (buck) mode) and a battery charging mode ( That is, BOOST (boost mode). Wherein, when the above-mentioned four-switch DC/DC power converter works in the BOOST mode, the above-mentioned voltage input unit may include a first DC power supply 011 and a first filter capacitor 021, and the above-mentioned voltage output unit may include a second DC power supply Power supply 012, second filter capacitor 022; when the above-mentioned four-switch DC/DC power converter works in BUCK (buck) mode, the above-mentioned voltage input unit may include a second DC power supply 012, a second filter capacitor 022, and the above-mentioned voltage output The unit may include a first DC power supply 011 and a first filter capacitor 021 . The above-mentioned first filter capacitor 021 and second filter capacitor 022 are respectively connected in parallel with the output end of the first DC power supply 011 and the output end of the second DC power supply 012 to reduce the AC ripple coefficient and smooth the DC output. In the DC power supply circuit, the filter capacitor not only stabilizes the DC output of the power supply and reduces the influence of the alternating ripple on the circuit, but also absorbs the current fluctuation generated during the operation of the circuit and the interference connected in series through the AC power supply, making the circuit more stable. Work performance is more stable.
请继续参见图1,如图1所示,当上述四开关DC/DC功率变换器工作在BUCK(降压)模式时,上述第二直流电源012作为电压输入单元对上述降压单元以及上述升压单元施加的电压,大于上述电压输出单元中第一直流电源011的稳态电压,此时上述电感04的电流从电感04的右端流向电感04的左端,上述电感04处于储能状态。当上述四开关DC/DC功率变换器工作在BOOST(升压)模式时,上述第一直流电源011作为电压输入单元对上述降压单元以及上述升压单元施加的电压,小于上述电压输出单元中第二直流电源012的稳态电压,此时上述电感04的电流从电感04的左端流向电感04的右端,上述电感04处于放能状态。Please continue to refer to FIG. 1. As shown in FIG. 1, when the above-mentioned four-switch DC/DC power converter works in the BUCK (buck) mode, the above-mentioned second DC power supply 012 acts as a voltage input unit to the above-mentioned step-down unit and the above-mentioned booster unit. The voltage applied by the voltage unit is greater than the steady-state voltage of the first DC power supply 011 in the voltage output unit. At this time, the current of the inductor 04 flows from the right end of the inductor 04 to the left end of the inductor 04, and the inductor 04 is in an energy storage state. When the four-switch DC/DC power converter operates in the BOOST mode, the voltage applied by the first DC power supply 011 as a voltage input unit to the step-down unit and the boost unit is smaller than the voltage output unit The steady-state voltage of the second DC power supply 012 in the middle, at this time, the current of the inductor 04 flows from the left end of the inductor 04 to the right end of the inductor 04, and the inductor 04 is in a discharging state.
在本申请可选的实施例中,上述降压单元中的第一上桥臂开关管031、第一下桥臂开关管032以及上述升压单元中的第二上桥臂开关管034、第二下桥臂开关管033可以是绝缘栅双极晶体管或者电力场效应管。绝缘栅双极晶体管(Insulated Gate Bipolar Transistor,IGBT)工作频率高、所需驱动功率小、开关损耗小以及开关速度快,可以使得直流升降压电路快速地实现降压与升压之间的转换。电力场效应管开关速度快、驱动电路简单、工作频率高。其中,上述降压单元中的第一上桥臂开关管031、以及上述升压单元中的第二下桥臂开关管033均可以在控制器施加的脉冲宽度调制信号的作用下分别实现导通和关断。可选的,上述控制器可以是脉冲宽度调制(Pulse Width Modulation,PWM)控制器(或称脉宽调制器),它是根据相应载荷的变化来调制上述半导体功率开关器件(如绝缘双极晶体管)的基极或者栅极的偏置,来实现导通时间的改变,从而实现占空比的改变。上述脉宽调制器也是利用微处理器的数字信号对模拟电路进行控制的一种非常有效的控制器,例如可以通过对半导体功率开关器件(如绝缘双极晶体管)的通断进行控制,使输出端得到一系列幅值相等的脉冲,用这些脉冲来替代正弦波或所需要的波形。也就是在输出波形的半个周期中产生多个脉冲,使各脉冲的等值电压为正弦波形,所获得的输出波形平滑且低次谐波少。按一定的规则对各脉冲的宽度进行调制,即可改变电路输出电压的大小,也可改变输出频率。In an optional embodiment of the present application, the first upper arm switch tube 031, the first lower arm switch tube 032 in the above-mentioned step-down unit, and the second upper arm switch tube 034, the first lower arm switch tube 032 in the above-mentioned step-up unit The second lower arm switch tube 033 may be an insulated gate bipolar transistor or a power field effect transistor. Insulated Gate Bipolar Transistor (IGBT) has high operating frequency, low required driving power, low switching loss and fast switching speed, which can make the DC buck-boost circuit quickly realize the conversion between buck and boost. . The power FET has fast switching speed, simple driving circuit and high operating frequency. Wherein, both the first upper bridge arm switch tube 031 in the aforementioned step-down unit and the second lower bridge arm switch tube 033 in the aforementioned step-up unit can be turned on respectively under the action of the pulse width modulation signal applied by the controller and shutdown. Optionally, the above-mentioned controller may be a pulse width modulation (Pulse Width Modulation, PWM) controller (or a pulse width modulator), which modulates the above-mentioned semiconductor power switching device (such as an insulated bipolar transistor according to the change of the corresponding load). ) of the base or gate bias to achieve the change of the on-time and thus the change of the duty cycle. The above-mentioned pulse width modulator is also a very effective controller that uses the digital signal of the microprocessor to control the analog circuit. A series of pulses of equal amplitude are obtained at the terminal, and these pulses are used to replace the sine wave or the desired waveform. That is, multiple pulses are generated in the half cycle of the output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output waveform is smooth and has few low-order harmonics. By modulating the width of each pulse according to certain rules, the output voltage of the circuit can be changed, and the output frequency can also be changed.
可以理解,在本申请可选的实施例中,控制器通过向上述降压单元中的第一上桥臂开关管、以及上述升压单元中的第二下桥臂开关管施加的脉冲宽度调制信号分别实现上述开关管导通和关断以控制上述第一上桥臂开关管以及上述第二下桥臂开关管的占空比,以此实现上述四开关DC/DC功率变换器从BUCK(降压)模式到BOOST(升压)模式的无缝切换,从而改变了电感电流的流向,使电感在储能状态以及放能状态中反复切换,完成了能量的双向传输,且输出电压保持在稳态,可以实现将上述蓄电池组的电压稳定在一定范围内以及对上述电动汽车中蓄电池组的反复充电功能。It can be understood that, in an optional embodiment of the present application, the controller uses the pulse width modulation applied to the first high-side switch in the step-down unit and the second low-side switch in the step-up unit. The signal realizes that the above-mentioned switch tubes are turned on and off respectively to control the duty ratio of the above-mentioned first upper bridge arm switch tube and the above-mentioned second lower bridge arm switch tube, so as to realize the above-mentioned four-switch DC/DC power converter from BUCK ( The seamless switching from buck) mode to BOOST (boost) mode changes the flow direction of the inductor current, so that the inductor switches repeatedly between the energy storage state and the energy discharge state, completing the bidirectional transmission of energy, and the output voltage remains at In the steady state, the functions of stabilizing the voltage of the battery pack within a certain range and repeatedly charging the battery pack in the electric vehicle can be realized.
下面将结合图2对本申请提供的功率变换器的控制方法进行说明,图2为波形仿真示意图,如图2所示,从上到下依次为输出电压波形、电感电流波形。其中,上述输出电压波形为一固定值,在实际应用中可以根据不同情况设置上述输出电压参考值,并将输入电压通过控制上述图1中的降压单元1以及上述图1中的升压单元2中各桥臂开关管的导通或关断达到输出电压参考值,并使直流电源的输出电压在工作条件变化时保持恒定。通过上述电感电流波形可以看出上述脉宽调制器通过向上述图1中的降压单元1以及上述图1中的升压单元2中各桥臂开关管发送脉冲宽度调制信号以控制上述各桥臂开关管导通或关 断,实现了对电感反复充放电的功能。The control method of the power converter provided by the present application will be described below with reference to FIG. 2 . FIG. 2 is a schematic diagram of waveform simulation. As shown in FIG. 2 , the output voltage waveform and the inductor current waveform are sequentially from top to bottom. The above-mentioned output voltage waveform is a fixed value. In practical applications, the above-mentioned output voltage reference value can be set according to different situations, and the input voltage can be controlled by the step-down unit 1 in FIG. 1 and the step-up unit in FIG. 1 above. In 2, the on or off of the switch tubes of each bridge arm reaches the reference value of the output voltage, and the output voltage of the DC power supply is kept constant when the working conditions change. From the above inductor current waveform, it can be seen that the above pulse width modulator controls the above bridges by sending pulse width modulation signals to the buck unit 1 in FIG. The arm switch tube is turned on or off, realizing the function of repeatedly charging and discharging the inductor.
下面将结合图3-图7对本申请的一种功率变换器的控制方法、一种功率变换器的控制装置以及计算机设备进行说明。A method for controlling a power converter, a control device for a power converter, and a computer device of the present application will be described below with reference to FIGS. 3 to 7 .
请参见图3,图3是本申请提供的一种功率变换器的控制方法的一流程示意图。本申请实施例提供的一种功率变换器的控制方法适用于四开关DC/DC功率变换器,其中,上述四开关DC/DC功率变换器的结构请参见图1所述的结构示意图,在此则不再赘述。本申请实施例提供的一种功率变换器的控制方法可包括步骤:Please refer to FIG. 3 , which is a schematic flowchart of a control method for a power converter provided by the present application. A method for controlling a power converter provided by an embodiment of the present application is applicable to a four-switch DC/DC power converter. For the structure of the above-mentioned four-switch DC/DC power converter, please refer to the schematic structural diagram described in FIG. 1 , here It will not be repeated here. A method for controlling a power converter provided by an embodiment of the present application may include the steps:
S101,确定上述第二上桥臂开关管的目标占空比。S101: Determine the target duty ratio of the second upper bridge arm switch tube.
在一些可行的实施方式中,当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,此时上述四开关DC/DC功率变换器工作在BUCK(降压)模式;当上述四开关DC/DC功率变换器工作在BUCK(降压)模式时,确定上述第二上桥臂的目标占空比。上述目标占空比为后续脉宽调制器调节上述第一上桥臂开关管的占空比的上限。In some possible implementations, when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit, the four-switch DC/DC power converter works in BUCK (buck) mode; When the DC/DC power converter operates in the BUCK (buck) mode, the target duty cycle of the second upper bridge arm is determined. The target duty cycle is the upper limit of the duty cycle of the first upper bridge arm switch tube adjusted by the subsequent pulse width modulator.
具体的,在本申请可选的实施例中,当上述四开关DC/DC功率变换器工作在BUCK(降压)模式时,可以将上述升压单元中的第二上桥臂开关管的目标占空比设置为某一个阈值(比如0.99),并将0.99设为后续脉宽调制器控制上述降压单元中的第一上桥臂开关管的导通时长,以调节上述第一上桥臂开关管的占空比的上限。Specifically, in an optional embodiment of the present application, when the above-mentioned four-switch DC/DC power converter operates in the BUCK (buck) mode, the target of the second high-arm switch tube in the above-mentioned boost unit can be changed to The duty cycle is set to a certain threshold (such as 0.99), and 0.99 is set as the subsequent pulse width modulator to control the conduction time of the first upper bridge arm switch in the above-mentioned step-down unit to adjust the above-mentioned first upper bridge arm The upper limit of the duty cycle of the switch tube.
S102,根据上述目标占空比控制上述第一上桥臂的导通时长以调节上述第一上桥臂的占空比。S102 , controlling the on-time duration of the first upper bridge arm according to the above target duty ratio to adjust the duty ratio of the above first upper bridge arm.
在一些可行的实施方式中,当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,此时上述四开关功率变换器工作在BUCK(降压)模式,控制器根据上述目标占空比确定上述第一上桥臂开关管的占空比的调节范围。其中,上述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于上述第二上桥臂开关管的目标占空比。在上述第一上桥臂开关管的占空比的调节范围内,控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。In some possible implementations, when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit, the four-switch power converter works in a buck (buck) mode, and the controller takes a duty cycle according to the target The ratio determines the adjustment range of the duty cycle of the first upper bridge arm switch tube. Wherein, the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the target duty cycle of the second high-arm switch tube. Within the adjustment range of the duty cycle of the first upper arm switch tube, the on-time duration of the first upper arm switch tube is controlled to adjust the duty cycle of the first upper arm switch tube.
具体的,在本申请可选的实施例中,当上述四开关DC/DC功率变换器工作在BUCK(降压)模式时,脉宽调制器根据上述目标占空比将上述第一上桥臂开关管的占空比范围确定为大于0且小于或者等于0.99。可选的,由脉宽调制器向上述第一上桥臂开关管发送脉冲宽度调制信号以控制上述第一上桥臂开关管的导通时长从而调节上述第一上桥臂开关管的占空比从0增加到0.99。当脉宽调制器控制上述第一上桥臂开关管的占空比达到0.99后上述四开关DC/DC功率变换器中的电压输入单元的输入电压等于上述电压输出单元的输出电压,此时脉宽调制器停止对上述第一上桥臂开关管的控制,BUCK(降压)模式结束,上述四开关DC/DC功率变换器也实现了的工作模式的转换,转换成BOOST(升压)模式。Specifically, in an optional embodiment of the present application, when the above-mentioned four-switch DC/DC power converter operates in a buck (buck) mode, the pulse width modulator converts the above-mentioned first upper bridge arm according to the above-mentioned target duty cycle The duty cycle range of the switch tube is determined to be greater than 0 and less than or equal to 0.99. Optionally, the pulse width modulator sends a pulse width modulation signal to the first upper bridge arm switch tube to control the on-time length of the first upper bridge arm switch tube to adjust the duty cycle of the first upper bridge arm switch tube. The ratio increases from 0 to 0.99. When the pulse width modulator controls the duty cycle of the first high-arm switch to reach 0.99, the input voltage of the voltage input unit in the four-switch DC/DC power converter is equal to the output voltage of the voltage output unit. The wide modulator stops the control of the above-mentioned first upper bridge arm switch tube, the BUCK (buck) mode ends, and the above-mentioned four-switch DC/DC power converter also realizes the conversion of the working mode to the BOOST (boost) mode. .
S103,固定上述第一上桥臂开关管的占空比。S103, the duty ratio of the first upper bridge arm switch tube is fixed.
在一些可行的实施方式中,当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,由控制器将上述第一上桥臂开关管的占空比固定在根据上述第二上桥臂开关管的占空比调节的占空比。此时BUCK(降压)模式结束,上述四开关DC/DC功率变换器进入BOOST(升压)模式。In some feasible implementation manners, when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the controller fixes the duty cycle of the first upper bridge arm switch tube according to the second upper bridge The duty cycle of the duty cycle adjustment of the arm switch tube. At this time, the BUCK (buck) mode ends, and the above-mentioned four-switch DC/DC power converter enters the BOOST (boost) mode.
具体的,在本申请可选的实施例中,当上述四开关DC/DC功率变换器工作在BUCK(降 压)模式时,上述脉宽调制器控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比达到0.99。且当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,将上述第一上桥臂开关管的占空比固定在0.99,并停止对上述第一上桥臂开关管的控制,此时BUCK(降压)模式结束。Specifically, in an optional embodiment of the present application, when the above-mentioned four-switch DC/DC power converter operates in the BUCK (buck) mode, the above-mentioned pulse width modulator controls the conduction of the above-mentioned first high-arm switch tube The duration is adjusted to adjust the duty cycle of the first upper bridge arm switch tube to 0.99. And when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the first upper bridge arm switch tube is fixed at 0.99, and the control of the first upper bridge arm switch tube is stopped, At this point, the BUCK (buck) mode ends.
S104,控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。S104: Control the on-time duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
在一些可行的实施方式中,当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述四开关DC/DC功率变换器进入BOOST(升压)模式,此时根据上述四开关DC/DC功率变换器的环路输出占空比和占空比系数确定上述第二下桥臂开关管的占空比。其中,上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述占空比系数为上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值,上述环路输出占空比等于上述第一上桥臂开关管的占空比,根据上述第二下桥臂开关管的占空比控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且所述输出电压不再增加。当上述四开关功率DC/DC变换器工作在BOOST(升压)模式时,控制器控制上述第二下桥臂开关管的占空比调节范围为小于上述目标占空比与上述占空比系数之和,且大于或等于上述目标占空比。In some possible implementations, when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the four-switch DC/DC power converter enters a BOOST (boost) mode. The duty cycle of the loop output of the /DC power converter and the duty cycle coefficient determine the duty cycle of the second lower arm switch tube. Wherein, when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle factor is the duty cycle of the first upper arm switch tube and the duty ratio of the first lower arm switch tube The difference value of the above-mentioned loop output duty ratio is equal to the duty ratio of the above-mentioned first upper bridge arm switch tube, and the conduction of the above-mentioned second lower bridge arm switch tube is controlled according to the above-mentioned duty ratio of the above-mentioned second lower bridge arm switch tube until the input voltage is smaller than the output voltage and the output voltage does not increase any more. When the four-switch power DC/DC converter works in the BOOST mode, the controller controls the duty cycle adjustment range of the second lower arm switch tube to be smaller than the target duty cycle and the duty cycle factor The sum is greater than or equal to the above target duty cycle.
具体的,在本申请可选的实施例中,当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述四开关DC/DC功率变换器进入BOOST(升压)模式,此时脉宽调制器开始调节上述第二下桥臂开关管的占空比。上述第二下桥臂开关管的占空比由环路输出占空比和占空比系数确定。这里的环路输出占空比为,上述电压输入单元的输入电压等于上述电压输出单元的输出电压时上述第一上桥臂开关管固定的占空比0.99。上述占空比系数为电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值。其中,上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比为互补关系,因此当上述第一上桥臂开关管的占空比为0.99时,上述第一下桥臂开关管的占空比为0.01,可以理解,这里的占空比系数为0.98。在本申请可选的实施例中,当述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述第二下桥臂开关管的占空比为上述四开关DC/DC功率变换器的环路输出0.99与上述占空比系数0.98的差值0.01。上述脉宽调制器根据上述第二下桥臂开关管的占空比,向上述第二下桥臂开关管发送脉冲宽度调制信号以控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。当上述脉宽调制器控制上述第二下桥臂开关管的占空比从0.01逐渐增加,且上述第二下桥臂开关管的导通时长逐渐增加时,上述电压输出单元的输出电压也逐渐增加。四开关DC/DC功率变换器进入BOOST(升压)模式,直至脉宽调制器达到工作在BOOST(升压)模式时的调节范围上限时,上述脉宽调制器停止对上述第二下桥臂开关管的控制,此时上述电压输出单元的输出电压达到最大值且不再增加。在本申请可选的实施例中,上述脉宽调制器工作在BOOST(升压)模式时对上述第二下桥臂开关管的占空比调节范围为大于等于0.99且小于1.97。Specifically, in an optional embodiment of the present application, when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the four-switch DC/DC power converter enters the BOOST mode, and at this time The pulse width modulator starts to adjust the duty ratio of the switch tube of the second lower bridge arm. The duty cycle of the second lower arm switch tube is determined by the loop output duty cycle and the duty cycle coefficient. The duty cycle of the loop output here is 0.99 when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit. The above duty cycle factor is the difference between the duty cycle of the first upper arm switch tube and the duty cycle of the first lower arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit . Wherein, the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube are complementary. Therefore, when the duty cycle of the first upper bridge arm switch tube is 0.99, the above The duty ratio of the switch tube of the first lower arm is 0.01. It can be understood that the duty ratio here is 0.98. In an optional embodiment of the present application, when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the switch tube of the second lower arm is the same as that of the four-switch DC/DC power converter. The difference between the loop output of 0.99 and the above duty cycle factor of 0.98 is 0.01. The pulse width modulator sends a pulse width modulation signal to the second lower arm switch tube according to the duty ratio of the second lower arm switch tube to control the on-time length of the second lower arm switch tube until the above The input voltage is smaller than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more. When the pulse width modulator controls the duty cycle of the second lower arm switch tube to gradually increase from 0.01, and the on-time duration of the second lower arm switch tube gradually increases, the output voltage of the voltage output unit also gradually increases. Increase. The four-switch DC/DC power converter enters the BOOST (boost) mode, until the pulse width modulator reaches the upper limit of the adjustment range when operating in the BOOST (boost) mode, the pulse width modulator stops the second lower bridge arm. The control of the switch tube, at this time, the output voltage of the above-mentioned voltage output unit reaches the maximum value and does not increase any more. In an optional embodiment of the present application, when the pulse width modulator operates in a BOOST (boost) mode, the duty cycle adjustment range of the second lower arm switch tube is greater than or equal to 0.99 and less than 1.97.
在本申请中,通过在电压输入单元的输入电压大于电压输出单元的输出单元时,确定 第二上桥臂开关管的目标占空比,并根据上述目标占空比控制第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。在电压输入单元的输入电压等于电压输出单元的输出电压时,固定第一上桥臂开关管的占空比,根据功率变换器的环路输出占空比系数确定第二下桥臂开关管的占空比,其中上述占空比系数为第一上桥臂开关管的占空比与第一下桥臂开关管的占空比的差值,上述环路输出占空比等于第一上桥臂开关管的占空比,并根据所述第二下桥臂开关管的占空比控制所述第二下桥臂的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加,实现了升压的功能。这种控制策略只有BUCK(降压)模式和BOOST(升压)模式,没有BUCK-BOOST(降压-升压)模式,通过控制器向第一上桥臂开关管与第二下桥臂开关管发送脉冲宽度调制信号快速地实现了四开关DC/DC变换器的工作模式的无缝切换,实现简单,降低了开关损耗、提高了能量传输的效率。In the present application, when the input voltage of the voltage input unit is greater than the output unit of the voltage output unit, the target duty cycle of the second upper arm switch is determined, and the first upper arm switch is controlled according to the above target duty cycle The on-time length of the transistor is used to adjust the duty cycle of the first upper bridge arm switch transistor. When the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the switch tube of the first upper bridge arm is fixed, and the duty ratio of the switch tube of the second lower arm arm is determined according to the duty cycle coefficient of the loop output of the power converter. duty cycle, wherein the above duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the above loop output duty cycle is equal to the first upper bridge arm The duty cycle of the switch tube of the arm switch, and control the on-time of the second lower arm according to the duty cycle of the switch tube of the second lower arm, until the input voltage is less than the output voltage and the output voltage is no longer Increase, to achieve the function of boost. This control strategy only has BUCK (buck) mode and BOOST (boost) mode, and there is no BUCK-BOOST (buck-boost) mode. The tube sends the pulse width modulation signal to quickly realize the seamless switching of the working mode of the four-switch DC/DC converter, which is simple to implement, reduces the switching loss and improves the efficiency of energy transmission.
请参见图4,图4是本申请提供的一种功率变换器的控制方法的另一流程示意图。该方法可以由计算机设备执行。如图4所示的方法可以包括以下步骤:Please refer to FIG. 4 , which is another schematic flowchart of a control method for a power converter provided by the present application. The method may be performed by a computer device. The method shown in Figure 4 may include the following steps:
S201,确定上述第二上桥臂开关管的目标占空比。S201 , determining the target duty cycle of the second upper bridge arm switch tube.
其中,该步骤S201的具体实施方式可参见上述图3所对应实施例中对步骤S101的描述,这里将不再赘述。The specific implementation of this step S201 may refer to the description of step S101 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
S202,根据上述目标占空比控制上述第一上桥臂的导通时长以调节上述第一上桥臂的占空比。S202 , controlling the on-time duration of the first upper bridge arm according to the above target duty ratio to adjust the duty ratio of the above first upper bridge arm.
其中,该步骤S202的具体实施方式可参见上述图3所对应实施例中对步骤S102的描述,这里将不再赘述。The specific implementation of this step S202 may refer to the description of step S102 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
S203,固定上述第一上桥臂开关管的占空比。S203, the duty ratio of the first upper bridge arm switch tube is fixed.
其中,该步骤S203的具体实施方式可参见上述图3所对应实施例中对步骤S103的描述,这里将不再赘述。The specific implementation of this step S203 may refer to the description of step S103 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
S204,控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。S204 , controlling the on-time duration of the second lower arm switch tube until the input voltage is less than the output voltage and the output voltage does not increase any more.
其中,该步骤S204的具体实施方式可参见上述图3所对应实施例中对步骤S104的描述,这里将不再赘述。For the specific implementation of this step S204, reference may be made to the description of step S104 in the embodiment corresponding to FIG. 3 above, which will not be repeated here.
S205,根据上述第一上桥臂开关管的占空比以及上述第二上桥臂开关管的占空比确定上述输出电压的电压增益。S205: Determine the voltage gain of the output voltage according to the duty cycle of the first high-arm switch tube and the duty cycle of the second high-arm switch tube.
可以理解,输出电压的电压增益为输出电压单元的电压除以输入电压单元的电压,而第一桥臂电压为上述第一上桥臂开关管的占空比乘以输入电压单元的电压;第二桥臂电压为上述第二上桥臂开关管的占空比乘以输出电压单元的电压。综上可得,上述输出电压的电压增益为上述第一上桥臂开关管的占空比除以上述第二上桥臂开关管的占空比。因此当上述输入电压单元的电压大于上述输出电压单元的电压时,调节上述第一上桥臂开关管的占空比以及所述第二上桥臂开关管的占空比以使上述输出电压的电压增益小于1大于0;当上述输入电压单元的电压等于上述输出电压单元的电压时,调节上述第一上桥臂开关管的占空比以及所述第二上桥臂开关管的占空比以使上述输出电压的电压增益等于1;当上述输入电压单元的电压小于上述输出电压单元的电压时,调节上述第一上桥臂开关管的占空比以及上述第二上桥臂开关管的占空比以使所述输出电压的电压增益大于1。It can be understood that the voltage gain of the output voltage is the voltage of the output voltage unit divided by the voltage of the input voltage unit, and the first bridge arm voltage is the duty cycle of the first upper bridge arm switch tube multiplied by the voltage of the input voltage unit; The voltage of the second bridge arm is the duty cycle of the second upper bridge arm switch tube multiplied by the voltage of the output voltage unit. To sum up, the voltage gain of the above-mentioned output voltage is the duty ratio of the above-mentioned first high-arm switch tube divided by the above-mentioned duty ratio of the above-mentioned second high-arm switch tube. Therefore, when the voltage of the above-mentioned input voltage unit is greater than the voltage of the above-mentioned output voltage unit, the duty cycle of the first high-side switch tube and the duty cycle of the second high-side switch tube are adjusted to make the output voltage The voltage gain is less than 1 and greater than 0; when the voltage of the input voltage unit is equal to the voltage of the output voltage unit, adjust the duty cycle of the first upper bridge arm switch tube and the duty cycle of the second upper bridge arm switch tube In order to make the voltage gain of the output voltage equal to 1; when the voltage of the input voltage unit is less than the voltage of the output voltage unit, adjust the duty cycle of the first upper bridge arm switch tube and the second upper bridge arm switch tube. duty cycle so that the voltage gain of the output voltage is greater than one.
进一步地,请参见图5,图5是本申请提供的一种功率变换器的控制装置的一结构示意图。该功率变换器的控制装置可以是运行于计算机设备中的一个计算机程序(包括程序代码),例如,该功率变换器的控制装置为一个应用软件;该功率变换器的控制装置可以用于执行本申请提供的方法中的相应步骤。如图5所示,功率变换器中包括:降压单元、升压单元、电压输入单元和电压输出单元,上述降压单元的一端连接上述电压输入单元,上述降压单元的另一端通过电感连接上述升压单元,上述升压单元的另一端连接上述电压输出单元,上述降压单元包括串联的第一上桥臂开关管和第一下桥臂开关管,上述升压单元包括串联的第二上桥臂开关管以及第二下桥臂开关管,上述控制装置包括:第一确定模块10、第一控制模块20、固定模块30、第二控制模块40。Further, please refer to FIG. 5 , which is a schematic structural diagram of a control device for a power converter provided by the present application. The control device of the power converter can be a computer program (including program code) running in the computer equipment, for example, the control device of the power converter is an application software; the control device of the power converter can be used to execute the present invention. The corresponding steps in the method provided by the application. As shown in FIG. 5 , the power converter includes: a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, one end of the step-down unit is connected to the voltage input unit, and the other end of the step-down unit is connected through an inductor The boosting unit, the other end of the boosting unit is connected to the voltage output unit, the step-down unit includes a first upper bridge arm switch tube and a first lower bridge arm switch tube connected in series, and the boost unit includes a second bridge arm switch tube connected in series. For the upper bridge arm switch tube and the second lower bridge arm switch tube, the above control device includes: a first determination module 10 , a first control module 20 , a fixing module 30 , and a second control module 40 .
第一确定模块10,用于当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,确定上述第二上桥臂开关管的目标占空比;a first determination module 10, configured to determine the target duty cycle of the second upper-bridge switch tube when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit;
第一控制模块20,用于根据上述第一确定模块10确定的目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,其中上述第一下桥臂开关管的占空比与上述第一上桥臂开关管的占空比互补,上述第二下桥臂开关管的占空比与上述第二上桥臂开关管的占空比互补;The first control module 20 is configured to control the on-time length of the first high-arm switch tube according to the target duty cycle determined by the first determination module 10 to adjust the duty cycle of the first high-arm switch tube, wherein The duty ratio of the first lower arm switch is complementary to the duty ratio of the first upper arm switch, and the duty ratio of the second lower arm switch is the same as the duty ratio of the second upper arm switch. Complementary empty ratio;
固定模块30,用于当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,固定上述第一上桥臂开关管的占空比;The fixing module 30 is configured to fix the duty cycle of the first upper bridge arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit;
第二控制模块40,用于控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。The second control module 40 is configured to control the conduction duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
在一种可能的实施方式中,上述第一控制模块10,还用于:In a possible implementation manner, the above-mentioned first control module 10 is further configured to:
根据上述目标占空比确定上述第一上桥臂开关管的占空比的调节范围,其中,上述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于上述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the second The duty cycle of the switch tube of the upper bridge arm;
根据上述第一上桥臂开关管的占空比的调节范围控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。The on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
在一种可能的实施方式中,上述固定模块30用于:In a possible implementation manner, the above-mentioned fixing module 30 is used for:
根据上述目标占空比固定上述第一上桥臂开关管的占空比,其中上述第一上桥臂开关管的占空比与上述目标占空比相同。The duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
在一种可能的实施方式中,上述第二控制模块40,还用于:In a possible implementation manner, the above-mentioned second control module 40 is further configured to:
根据上述功率变换器的环路输出占空比和占空比系数确定上述第二下桥臂开关管的占空比,其中上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述占空比系数为上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值,上述环路输出占空比等于上述第一上桥臂开关管的占空比;The duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above The duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube. duty cycle;
根据上述第二下桥臂开关管的占空比控制上述第二下桥臂开关管的导通时长。The on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
在一种可能的实施方式中,上述第二下桥臂开关管的占空比小于上述目标占空比与上述占空比系数之和,且大于或等于上述目标占空比。In a possible implementation manner, the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle.
在一种可能的实施方式中,请一并参见图6,上述装置还包括:In a possible implementation, please refer to FIG. 6 together, the above-mentioned device further includes:
第二确定模块50,用于根据上述第一上桥臂开关管的占空比以及上述第二上桥臂开关 管的占空比确定上述输出电压的电压增益。The second determination module 50 is configured to determine the voltage gain of the output voltage according to the duty cycle of the first high-arm switch and the duty cycle of the second high-arm switch.
其中,该第一确定模块10、第一控制模块20、固定模块30、第二控制模块40、第二确定模块50的具体实现方式可以参见上述图3所对应实施例中对步骤S101-步骤S104的描述,和/或上述图4所对应实施例中对步骤S201-步骤S205的描述,这里将不再继续进行赘述。另外,对采用相同方法的有益效果描述,也不再进行赘述。The specific implementation manner of the first determination module 10 , the first control module 20 , the fixing module 30 , the second control module 40 and the second determination module 50 can be referred to the steps S101 to S104 in the embodiment corresponding to FIG. 3 above. , and/or the description of step S201 to step S205 in the above-mentioned embodiment corresponding to FIG. 4 , which will not be repeated here. In addition, the description of the beneficial effects of using the same method will not be repeated.
进一步地,请参见图7,图7是本申请提供的计算机设备的一结构示意图。如图7所示,该计算机设备1000可以包括:至少一个处理器1001,例如CPU,至少一个网络接口1003,存储器1004,至少一个通信总线1002。其中,通信总线1002用于实现这些组件之间的连接通信。其中网络接口1003可选地可以包括标准的有线接口、无线接口(如WI-FI接口)。存储器1004可以是高速随机存储记忆体(random access memory,RAM)存储器,也可以是非不稳定的存储器(non-volatile memory),例如至少一个磁盘存储器。存储器1004可选地还可以是至少一个位于远离前述处理器1001的存储装置。如图6所示,作为一种计算机存储介质的存储器1004中可以包括操作系统、网络通信模块以及设备控制应用程序。Further, please refer to FIG. 7 , which is a schematic structural diagram of the computer device provided by the present application. As shown in FIG. 7 , the computer device 1000 may include: at least one processor 1001 , such as a CPU, at least one network interface 1003 , memory 1004 , and at least one communication bus 1002 . Among them, the communication bus 1002 is used to realize the connection and communication between these components. The network interface 1003 may optionally include a standard wired interface and a wireless interface (eg, a WI-FI interface). The memory 1004 may be a high-speed random access memory (RAM) memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 1004 can optionally also be at least one storage device located remotely from the aforementioned processor 1001 . As shown in FIG. 6, the memory 1004, which is a computer storage medium, may include an operating system, a network communication module, and a device control application program.
在图7所示的计算机设备1000中,而处理器1001可以用于调用存储器1004中存储的设备控制应用程序,以实现:In the computer device 1000 shown in FIG. 7, the processor 1001 can be used to call the device control application program stored in the memory 1004 to realize:
当上述电压输入单元的输入电压大于上述电压输出单元的输出电压时,确定上述第二上桥臂开关管的目标占空比,并根据上述目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,其中上述第一下桥臂开关管的占空比与上述第一上桥臂开关管的占空比互补,上述第二下桥臂开关管的占空比与上述第二上桥臂开关管的占空比互补;When the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit, determine the target duty cycle of the second upper arm switch tube, and control the first upper arm switch tube according to the target duty cycle The turn-on time is used to adjust the duty cycle of the first upper bridge arm switch tube, wherein the duty cycle of the first lower bridge arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube, and the second lower arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube. The duty cycle of the bridge arm switch is complementary to the duty cycle of the second upper bridge arm switch;
当上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,固定上述第一上桥臂开关管的占空比,并控制上述第二下桥臂开关管的导通时长,直至上述输入电压小于上述输出电压且上述输出电压不再增加。When the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the first upper arm switch is fixed, and the on-time of the second lower arm switch is controlled until the input The voltage is less than the above-mentioned output voltage and the above-mentioned output voltage does not increase any more.
在一种可能的实施方式中,上述根据所述目标占空比控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比,包括:In a possible implementation manner, the above-mentioned controlling the on-time duration of the first upper bridge arm switch tube according to the target duty ratio to adjust the duty ratio of the aforementioned first upper bridge arm switch tube includes:
根据上述目标占空比确定所述第一上桥臂开关管的占空比的调节范围,其中,上述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于上述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first high-arm switch tube is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first high-arm switch tube is greater than 0 and less than or equal to the above-mentioned first The duty cycle of the switch tube of the second upper bridge arm;
根据上述第一上桥臂开关管的占空比的调节范围控制上述第一上桥臂开关管的导通时长以调节上述第一上桥臂开关管的占空比。The on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
在一种可能的实施方式中,上述固定所述第一上桥臂开关管的占空比包括:In a possible implementation manner, the above-mentioned fixing the duty cycle of the switch tube of the first upper bridge arm includes:
根据上述目标占空比固定上述第一上桥臂开关管的占空比,其中上述第一上桥臂开关管的占空比与上述目标占空比相同。The duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
在一种可能的实施方式中,上述控制上述第二下桥臂开关管的导通时长,包括:In a possible implementation manner, the above-mentioned controlling the on-time duration of the switch tube of the second lower bridge arm includes:
根据上述功率变换器的环路输出占空比和占空比系数确定上述第二下桥臂开关管的占空比,其中上述电压输入单元的输入电压等于上述电压输出单元的输出电压时,上述占空比系数为上述第一上桥臂开关管的占空比与上述第一下桥臂开关管的占空比的差值,上述 环路输出占空比等于上述第一上桥臂开关管的占空比;The duty cycle of the second lower arm switch is determined according to the loop output duty cycle and duty cycle coefficient of the power converter, and when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the above The duty cycle factor is the difference between the duty cycle of the first upper bridge arm switch tube and the duty cycle of the first lower bridge arm switch tube, and the loop output duty cycle is equal to the first upper bridge arm switch tube. duty cycle;
根据上述第二下桥臂开关管的占空比控制上述第二下桥臂开关管的导通时长。The on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
在一种可能的实施方式中,上述第二下桥臂开关管的占空比小于上述目标占空比与上述占空比系数之和,且大于或等于上述目标占空比。In a possible implementation manner, the duty cycle of the second lower arm switch tube is smaller than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle.
在一种可能的实施方式中,上述方法还包括:In a possible implementation, the above method further includes:
根据上述第一上桥臂开关管的占空比以及上述第二上桥臂开关管的占空比确定上述输出电压的电压增益。The voltage gain of the output voltage is determined according to the duty cycle of the first high-side switch and the duty cycle of the second high-side switch.
此外,这里需要指出的是:本申请还提供了一种计算机可读存储介质,且该计算机可读存储介质中存储有前文提及的一种功率变换器的控制装置所执行的计算机程序,且该计算机程序包括程序指令,当该处理器执行该程序指令时,能够执行前文图3和/或图4所对应实施例中对该一种功率变换器的控制方法的描述,因此,这里将不再进行赘述。另外,对采用相同方法的有益效果描述,也不再进行赘述。对于本申请所涉及的计算机可读存储介质实施例中未披露的技术细节,请参照本申请方法实施例的描述。作为示例,程序指令可被部署为在一个计算设备上执行,或者在位于一个地点的多个计算设备上执行。In addition, it should be pointed out here that: the present application also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program executed by a control device of the aforementioned power converter, and The computer program includes program instructions, and when the processor executes the program instructions, it can execute the description of the control method for a power converter in the embodiment corresponding to FIG. 3 and/or FIG. 4 . Let's go into details. In addition, the description of the beneficial effects of using the same method will not be repeated. For technical details not disclosed in the computer-readable storage medium embodiments involved in the present application, please refer to the description of the method embodiments of the present application. By way of example, program instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程,是可以通过计算机程序来指令相关的硬件来完成,上述的程序可存储于一计算机可读取存储介质中,该程序在执行时,可包括如上述各方法的实施例的流程。其中,上述计算机可读存储介质可以是前述任一实施例提供的一种功率变换器的控制装置或者上述设备的内部存储单元,例如电子设备的硬盘或内存。该计算机可读存储介质也可以是该电子设备的外部存储设备,例如该电子设备上配备的插接式硬盘,智能存储卡(smart media card,SMC),安全数字(secure digital,SD)卡,闪存卡(flash card)等。上述计算机可读存储介质还可以包括磁碟、光盘、只读存储记忆体(read-only memory,ROM)或随机存储记忆体等。进一步地,该计算机可读存储介质还可以既包括该电子设备的内部存储单元也包括外部存储设备。该计算机可读存储介质用于存储该计算机程序以及该电子设备所需的其它程序和数据。该计算机可读存储介质还可以用于暂时地存储已经输出或者将要输出的数据。Those of ordinary skill in the art can understand that all or part of the process in the method of the above embodiment can be implemented by instructing the relevant hardware through a computer program, and the above program can be stored in a computer-readable storage medium, and the program is in During execution, it may include the processes of the embodiments of the above-mentioned methods. The computer-readable storage medium may be a control device of a power converter provided in any of the foregoing embodiments or an internal storage unit of the above-mentioned device, such as a hard disk or a memory of an electronic device. The computer-readable storage medium can also be an external storage device of the electronic device, such as a pluggable hard disk, a smart media card (SMC), a secure digital (SD) card equipped on the electronic device, Flash card (flash card), etc. The above-mentioned computer-readable storage medium may also include a magnetic disk, an optical disk, a read-only memory (read-only memory, ROM) or a random access memory, and the like. Further, the computer-readable storage medium may also include both an internal storage unit of the electronic device and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the electronic device. The computer-readable storage medium can also be used to temporarily store data that has been or will be output.
本发明的权利要求书和说明书及附图中的术语“第一”、“第二”等是用于区别不同对象,而不是用于描述特定顺序。此外,术语“包括”和“具有”以及它们任何变形,意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元,而是可选地还包括没有列出的步骤或单元,或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。在本文中提及“实施例”意味着,结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置展示该短语并不一定均是指相同的实施例,也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是,本文所描述的实施例可以与其它实施例相结合。在本发明说明书和所附权利要求书中使用的术语“和/或”是指相关联列出的项中的一个或多个的任何组合以及所有可能组合,并且包括这些组合。The terms "first", "second" and the like in the claims, description and drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices. Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments. As used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items.
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、计算机软件或者二者的结合来实现,为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。专业 技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Skilled artisans may use different methods of implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the present invention.
在本申请所提供的实施例中,所揭露的电路和方法,还可以通过其它的方式实现。例如,以上所描述的装置实施例是示意性的,例如,电路模块的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个模块或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。In the embodiments provided in this application, the disclosed circuits and methods may also be implemented in other manners. For example, the device embodiments described above are illustrative. For example, the division of circuit modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。Each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims (10)
- 一种功率变换器的控制方法,所述功率变换器中包括:降压单元、升压单元、电压输入单元和电压输出单元,所述降压单元的一端连接所述电压输入单元,所述降压单元的另一端通过电感连接所述升压单元,所述升压单元的另一端连接所述电压输出单元,所述降压单元包括串联的第一上桥臂开关管和第一下桥臂开关管,所述升压单元包括串联的第二上桥臂开关管以及第二下桥臂开关管,其特征在于,所述方法包括:A control method for a power converter, the power converter includes a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, one end of the step-down unit is connected to the voltage input unit, and the step-down unit is connected to the voltage input unit. The other end of the voltage unit is connected to the boost unit through an inductor, the other end of the boost unit is connected to the voltage output unit, and the step-down unit includes a first upper bridge arm switch tube and a first lower bridge arm connected in series A switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, wherein the method includes:当所述电压输入单元的输入电压大于所述电压输出单元的输出电压时,确定所述第二上桥臂开关管的目标占空比,并根据所述目标占空比控制所述第一上桥臂开关管的导通时长以调节所述第一上桥臂开关管的占空比,其中所述第一下桥臂开关管的占空比与所述第一上桥臂开关管的占空比互补,所述第二下桥臂开关管的占空比与所述第二上桥臂开关管的占空比互补;When the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit, determine the target duty cycle of the second high-side switch, and control the first high-end switch according to the target duty cycle The on-time length of the bridge arm switch tube is used to adjust the duty cycle of the first upper bridge arm switch tube, wherein the duty cycle of the first lower bridge arm switch tube and the duty cycle of the first upper bridge arm switch tube Complementary duty cycle, the duty cycle of the second lower bridge arm switch tube is complementary to the duty cycle of the second upper bridge arm switch tube;当所述电压输入单元的输入电压等于所述电压输出单元的输出电压时,固定所述第一上桥臂开关管的占空比,并控制所述第二下桥臂开关管的导通时长,直至所述输入电压小于所述输出电压且所述输出电压不再增加。When the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit, the duty cycle of the first upper arm switch is fixed, and the on-time of the second lower arm switch is controlled , until the input voltage is less than the output voltage and the output voltage no longer increases.
- 根据权利要求1所述的方法,其特征在于,所述根据所述目标占空比控制所述第一上桥臂开关管的导通时长以调节所述第一上桥臂开关管的占空比,包括:The method according to claim 1, wherein the on-time duration of the first high-side switch transistor is controlled according to the target duty cycle to adjust the duty of the first high-side switch transistor than, including:根据所述目标占空比确定所述第一上桥臂开关管的占空比的调节范围,其中,所述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于所述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first upper arm switch is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first upper arm switch is greater than 0 and less than or equal to the duty cycle of the second upper bridge arm switch tube;根据所述第一上桥臂开关管的占空比的调节范围控制所述第一上桥臂开关管的导通时长以调节所述第一上桥臂开关管的占空比。The on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
- 根据权利要求1所述的方法,其特征在于,所述固定所述第一上桥臂开关管的占空比包括:The method according to claim 1, wherein the fixing the duty cycle of the first upper bridge arm switch tube comprises:根据所述目标占空比固定所述第一上桥臂开关管的占空比,其中所述第一上桥臂开关管的占空比与所述目标占空比相同。The duty cycle of the first high-arm switch tube is fixed according to the target duty cycle, wherein the duty cycle of the first high-arm switch tube is the same as the target duty cycle.
- 根据权利要求1或3所述的方法,其特征在于,所述控制所述第二下桥臂开关管的导通时长,包括:The method according to claim 1 or 3, wherein the controlling the on-time duration of the switch tube of the second lower bridge arm comprises:根据所述功率变换器的环路输出占空比和占空比系数确定所述第二下桥臂开关管的占空比,其中所述电压输入单元的输入电压等于所述电压输出单元的输出电压时,所述占空比系数为所述第一上桥臂开关管的占空比与所述第一下桥臂开关管的占空比的差值,所述环路输出占空比等于所述第一上桥臂开关管的占空比;The duty cycle of the second lower arm switch is determined according to the loop output duty cycle and the duty cycle coefficient of the power converter, wherein the input voltage of the voltage input unit is equal to the output of the voltage output unit voltage, the duty cycle factor is the difference between the duty cycle of the first upper arm switch and the duty cycle of the first lower arm switch, and the loop output duty cycle is equal to the duty cycle of the first upper bridge arm switch tube;根据所述第二下桥臂开关管的占空比控制所述第二下桥臂开关管的导通时长。The on-time duration of the second lower arm switch tube is controlled according to the duty cycle of the second lower arm switch tube.
- 根据权利要求4所述的方法,其特征在于,所述第二下桥臂开关管的占空比小于所述目标占空比与所述占空比系数之和,且大于或等于所述目标占空比。The method according to claim 4, wherein the duty cycle of the second lower arm switch is less than the sum of the target duty cycle and the duty cycle coefficient, and is greater than or equal to the target duty cycle.
- 根据权利要求2或5所述的方法,其特征在于,所述方法还包括:The method according to claim 2 or 5, wherein the method further comprises:根据所述第一上桥臂开关管的占空比以及所述第二上桥臂开关管的占空比确定所述输出电压的电压增益。The voltage gain of the output voltage is determined according to the duty cycle of the first high-side switch and the duty cycle of the second high-side switch.
- 一种功率变换器的控制装置,其特征在于,所述功率变换器中包括:降压单元、升压单元、电压输入单元和电压输出单元,所述降压单元的一端连接所述电压输入单元,所述降压单元的另一端通过电感连接所述升压单元,所述升压单元的另一端连接所述电压输出单元,所述降压单元包括串联的第一上桥臂开关管和第一下桥臂开关管,所述升压单元包括串联的第二上桥臂开关管以及第二下桥臂开关管,所述装置包括:A control device for a power converter, characterized in that the power converter includes: a step-down unit, a step-up unit, a voltage input unit and a voltage output unit, and one end of the step-down unit is connected to the voltage input unit , the other end of the step-down unit is connected to the step-up unit through an inductance, the other end of the step-up unit is connected to the voltage output unit, and the step-down unit includes a series-connected first high-arm switch tube and a second A lower bridge arm switch tube, the boosting unit includes a second upper bridge arm switch tube and a second lower bridge arm switch tube connected in series, and the device includes:第一确定模块,用于当所述电压输入单元的输入电压大于所述电压输出单元的输出电压时,确定所述第二上桥臂开关管的目标占空比;a first determining module, configured to determine a target duty cycle of the second upper-bridge switch tube when the input voltage of the voltage input unit is greater than the output voltage of the voltage output unit;第一控制模块,用于根据所述目标占空比控制所述第一上桥臂开关管的导通时长以调节所述第一上桥臂开关管的占空比,其中所述第一下桥臂开关管的占空比与所述第一上桥臂开关管的占空比互补,所述第二下桥臂开关管的占空比与所述第二上桥臂开关管的占空比互补;A first control module, configured to control the on-time length of the first upper bridge arm switch tube according to the target duty cycle to adjust the duty cycle of the first upper bridge arm switch tube, wherein the first lower arm switch tube is The duty cycle of the bridge arm switch tube is complementary to the duty cycle of the first upper bridge arm switch tube, and the duty cycle of the second lower bridge arm switch tube is the same as the duty cycle of the second upper bridge arm switch tube than complementary;固定模块,用于当所述电压输入单元的输入电压等于所述电压输出单元的输出电压时,固定所述第一上桥臂开关管的占空比;a fixing module, configured to fix the duty cycle of the first upper bridge arm switch tube when the input voltage of the voltage input unit is equal to the output voltage of the voltage output unit;第二控制模块,用于控制所述第二下桥臂开关管的导通时长,直至所述输入电压小于所述输出电压且所述输出电压不再增加。The second control module is configured to control the on-time duration of the second lower arm switch until the input voltage is less than the output voltage and the output voltage does not increase any more.
- 根据权利要求7所述的装置,其特征在于,所述第一控制模块用于:The device according to claim 7, wherein the first control module is used for:根据所述目标占空比确定所述第一上桥臂开关管的占空比的调节范围,其中,所述第一上桥臂开关管的占空比的调节范围为大于0且小于或者等于所述第二上桥臂开关管的占空比;The adjustment range of the duty cycle of the first upper arm switch is determined according to the target duty cycle, wherein the adjustment range of the duty cycle of the first upper arm switch is greater than 0 and less than or equal to the duty cycle of the switch tube of the second upper bridge arm;根据所述第一上桥臂开关管的占空比的调节范围控制所述第一上桥臂开关管的导通时长以调节所述第一上桥臂开关管的占空比。The on-time length of the first high-arm switch tube is controlled according to the adjustment range of the duty cycle of the first high-arm switch tube to adjust the duty cycle of the first high-arm switch tube.
- 一种计算机设备,其特征在于,包括:处理器、存储器以及网络接口;A computer device, characterized in that it includes: a processor, a memory, and a network interface;所述处理器与存储器以及网络接口相连,其中,网络接口用于提供数据通信功能,所述存储器用于存储程序代码,所述处理器用于调用所述程序代码,执行权利要求1-6任一项所述的方法。The processor is connected to a memory and a network interface, wherein the network interface is used to provide a data communication function, the memory is used to store program codes, and the processor is used to call the program codes to execute any one of claims 1-6 method described in item.
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质存储有计算机程序,所述计算机程序包括程序指令,所述程序指令被处理器执行时,执行权利要求1-6任一项所述的方法。A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, the computer program includes program instructions, and when the program instructions are executed by a processor, any one of claims 1-6 is executed. method described in item.
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CN109889042A (en) * | 2019-03-26 | 2019-06-14 | 深圳市健网科技有限公司 | The voltage conversion circuit and voltage switching control method of bidirectional DC power supply converter |
CN111245231A (en) * | 2020-01-17 | 2020-06-05 | 东莞南方半导体科技有限公司 | Boost mode constant voltage control method and circuit of soft switch bidirectional direct current converter |
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