CN113691136B - Control method and control device of conversion circuit - Google Patents
Control method and control device of conversion circuit Download PDFInfo
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- CN113691136B CN113691136B CN202110870329.3A CN202110870329A CN113691136B CN 113691136 B CN113691136 B CN 113691136B CN 202110870329 A CN202110870329 A CN 202110870329A CN 113691136 B CN113691136 B CN 113691136B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a control method and a control device of a conversion circuit, wherein the control method comprises the following steps: acquiring an electrical parameter of the conversion circuit and a preset value which is preset and corresponds to the electrical parameter; obtaining a first control quantity based on the electrical parameter and a preset value; carrying out proportional adjustment and amplitude limiting processing on the first control quantity to obtain a second control quantity, carrying out amplitude limiting processing on the first control quantity to obtain a third control quantity, and enabling the second control quantity and/or the third control quantity to linearly change along with the first control quantity; and respectively controlling the voltage reduction module and the voltage boosting module by adopting a second control quantity and a third control quantity. The control device corresponds to the control method. The control method and the control device are suitable for preventing the output voltage of the conversion circuit from being over-voltage, simplifying the control complexity and improving the working stability of the circuit.
Description
Technical Field
The present invention relates to the field of conversion circuit control technologies, and in particular, to a method and an apparatus for controlling a conversion circuit.
Background
The existing double-inductance current type push-pull circuit is shown in fig. 1, and the topology is characterized in that: in order to provide a free-wheeling path for the inductor current, the duty cycles of the switching tubes S1 and S2 need to have an overlapping area, and thus the duty cycles of the switching tubes S1 and S2 are greater than 0.5. Generally, the push-pull circuit can be stably operated by performing closed-loop control on the input current, wherein a current closed-loop control loop is shown in fig. 2, and the push-pull circuit can be stably operated by the current closed loop under the condition that the load is enough.
However, under the condition of light load or high input voltage, the minimum duty ratio is limited to more than 0.5, so that the output voltage can only be reduced to a voltage value corresponding to the duty ratio of 0.5 at minimum and cannot be reduced to a voltage value meeting the control requirement, and the output voltage is continuously raised due to uncontrolled and cannot be stabilized at a required working point, and finally overvoltage of the output voltage is caused.
Disclosure of Invention
The present invention is directed to overcome at least one of the drawbacks and problems of the related art, and provides a method and a device for controlling a converter circuit, which are suitable for effectively controlling an output voltage of a dual inductor current type push-pull circuit, preventing the output voltage from being over-voltage, simplifying the control complexity, and improving the operating stability of the converter circuit.
To achieve the above object, a first aspect of the present invention provides a control method for a conversion circuit, the circuit including a first switch, a second switch, a third switch and two inductors; the first switch is suitable for forming a voltage reduction module with the inductor, and the second switch and the third switch are suitable for forming a voltage boosting module with the two inductors; the method comprises the following steps: acquiring one or more electrical parameters of the circuit and one or more preset values which are preset and correspond to the electrical parameters; wherein the electrical parameters at least comprise an actual output voltage value of the circuit, and the preset values at least comprise a first voltage preset value corresponding to the actual output voltage value; obtaining a first control quantity based on the acquired electrical parameter and a preset value; carrying out proportional adjustment and amplitude limiting processing on the first control quantity to obtain a second control quantity, carrying out amplitude limiting processing on the first control quantity to obtain a third control quantity, and enabling the second control quantity and/or the third control quantity to linearly change along with the first control quantity; and respectively controlling the voltage reduction module and the voltage boosting module by adopting the second control quantity and the third control quantity.
Further, the electrical parameter further includes an actual input current value of the circuit, and the preset value further includes a first current preset value corresponding to the actual input current value; the obtaining of the first control quantity based on the acquired electrical parameter and the preset value includes: inputting the actual output voltage value and the first voltage preset value into a first closed-loop control module as a feedback quantity and a given quantity respectively; the actual input current value and the value obtained by multiplying the first current preset value by the output quantity of the first closed-loop control module are respectively used as a feedback quantity and a given quantity to be input into a second closed-loop control module; and taking the output quantity of the second closed-loop control module as the first control quantity.
Further, in the process of obtaining the second control quantity, a scaling coefficient for scaling and amplitude limiting the first control quantity is defined as K1, and an amplitude limiting range is defined as a1-a 2; defining the range of amplitude limiting processing for amplitude limiting processing on the first control quantity in the process of obtaining the third control quantity as B1-B2; wherein A1 and A2 are 0 and 1, respectively; the B1 is greater than 0.5 and its product with the K1 is 1; the B2 is less than 1.
Further, the first switch, the second switch and the third switch are all controllable switches suitable for being modulated by a PWM signal; the first control quantity, the second control quantity and the third control quantity are PWM signals; wherein the second control quantity is a first PWM signal for controlling the first switch; the third control amount includes a second PWM signal and a third PWM signal for controlling the second switch and the third switch, respectively; the second and third PWM signals are the same in magnitude and 180 ° out of phase.
Furthermore, the conversion circuit is used for boosting a direct-current input power supply and then outputting the boosted direct-current input power supply, and comprises an inversion unit, a transformer and a rectification unit which are coupled in sequence; the inversion unit comprises a first diode, the first switch, a second switch, a third switch, a first inductor and a second inductor which form the two inductors, and a first branch circuit, a second branch circuit and a third branch circuit are formed; the first branch circuit comprises the first switch and a first diode which are connected in series, the first switch is connected with the anode of the input power supply, and the anode of the first diode is connected with the cathode of the input power supply; the second branch circuit comprises a first inductor and a second switch which are connected in series; the first inductor is connected with a common point of the first switch and the first diode, and the second switch is connected with the negative pole of the input power supply; the third branch circuit comprises a second inductor and a third switch which are connected in series, the second inductor is connected with the common point of the first switch and the first diode, and the third switch is connected with the negative electrode of the input power supply; the primary winding of the transformer is connected with the common point of the second switch and the first inductor and the common point of the third switch and the second inductor; the input end of the rectifying unit is connected with the secondary winding of the transformer, and the output end of the rectifying unit outputs direct current electric energy.
In order to achieve the above object, a second aspect of the present invention provides a control device for a conversion circuit, the circuit including a first switch, a second switch, a third switch and two inductors; the first switch is suitable for forming a voltage reduction module with the inductor, and the second switch and the third switch are suitable for forming a voltage boosting module with the two inductors; the device comprises: the acquisition unit is used for acquiring one or more electrical parameters of the circuit and one or more preset values which are preset and correspond to the electrical parameters; wherein the electrical parameters at least comprise an actual output voltage value of the circuit, and the preset values at least comprise a first voltage preset value corresponding to the actual output voltage value; a first generation unit that calculates a first control amount based on the acquired electrical parameter and a preset value; and the second generation unit is used for carrying out proportion adjustment and amplitude limiting processing on the first control quantity to obtain a second control quantity for controlling the voltage reduction module, carrying out amplitude limiting processing on the first control quantity to obtain a third control quantity for controlling the voltage boosting module, and enabling the second control quantity and/or the third control quantity to linearly change along with the first control quantity.
Further, the electrical parameter obtained by the obtaining unit further includes an actual input current value of the circuit, and the preset value obtained by the obtaining unit further includes a first current preset value corresponding to the actual input current value; the first generating unit comprises a first closed-loop control module and a second closed-loop control module; the feedback quantity and the given quantity of the first closed-loop control module are respectively the actual output voltage value and the first voltage preset value, and the output quantity is an adjusting coefficient; the feedback quantity and the given quantity of the second closed-loop control module are respectively the actual input current value and the value obtained by multiplying the first current preset value by the regulating coefficient, and the output quantity of the second closed-loop control module is the first control quantity.
Further, the second generating unit includes a first scale adjusting module, a first amplitude limiting processing module and a second amplitude limiting processing module; the first proportion adjusting module and the first amplitude limiting processing module are used for respectively carrying out proportion adjustment and first amplitude limiting processing on the first control quantity and obtaining the second control quantity; the first proportion adjusting module has a proportionality coefficient of K1, and the first amplitude limiting processing module has an amplitude limiting range of 0-1; the second amplitude limiting processing module is used for carrying out second amplitude limiting processing on the first control quantity and obtaining a third control quantity; the clipping range of the second clipping processing module is B1-B2; the B1 is greater than 0.5 and its product with the K1 is 1; the B2 is less than 1.
Further, the first switch, the second switch and the third switch are all controllable switches suitable for being modulated by a PWM signal; the first control quantity, the second control quantity and the third control quantity are PWM signals; wherein the second control quantity is a first PWM signal for controlling the first switch; the third control amount includes a second PWM signal and a third PWM signal for controlling the second switch and the third switch, respectively; the second and third PWM signals are the same in magnitude and 180 ° out of phase.
Furthermore, the conversion circuit is used for boosting a direct-current input power supply and then outputting the boosted direct-current input power supply, and comprises an inversion unit, a transformer and a rectification unit which are coupled in sequence; the inversion unit comprises a first diode, the first switch, a second switch, a third switch, a first inductor and a second inductor which form the two inductors, and a first branch circuit, a second branch circuit and a third branch circuit are formed; the first branch circuit comprises the first switch and a first diode which are connected in series, the first switch is connected with the anode of the input power supply, and the anode of the first diode is connected with the cathode of the input power supply; the second branch circuit comprises a first inductor and a second switch which are connected in series with each other; the first inductor is connected with a common point of the first switch and the first diode, and the second switch is connected with the negative pole of the input power supply; the third branch circuit comprises a second inductor and a third switch which are connected in series, the second inductor is connected with the common point of the first switch and the first diode, and the third switch is connected with the negative electrode of the input power supply; the primary winding of the transformer is connected with the common point of the second switch and the first inductor and the common point of the third switch and the second inductor; the input end of the rectifying unit is connected with the secondary winding of the transformer, and the output end of the rectifying unit outputs direct current electric energy.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional double-inductor current type push-pull circuit, the improved circuit is provided with the voltage reduction module, the output voltage of the whole conversion circuit can be reduced by conducting and controlling the first switch, so that the conversion circuit is suitable for effectively controlling the output voltage of the double-inductor current type push-pull circuit, the overvoltage of the output voltage is prevented, and in addition, the conversion circuit is suitable for realizing wide-range voltage regulation.
Moreover, on the basis of the improved circuit, the control method provided by the invention has the advantage of simplifying the control complexity. Specifically, in a converter circuit including two switches having substantially different control logics, it is generally necessary to set a plurality of different input amounts to obtain a control amount of each switch in the related art. For example, for voltage control only, it is generally necessary to set an intermediate voltage value between an input voltage value and an output voltage value, then obtain a control amount of one of the switches using the input voltage value and the intermediate voltage value, and obtain a control amount of the other switch using the output voltage value and the intermediate voltage value. This makes the control process more complicated in the scenario that the invention needs to realize the normal operation of the converter circuit and also needs to prevent the overvoltage of the output voltage of the converter circuit.
For this purpose, the control method of the invention firstly obtains the electrical parameters of the circuit and the corresponding preset values, and obtains a first control quantity capable of reflecting the overall control requirement based on the electrical parameters and the preset values, wherein the electrical parameters at least comprise the actual output voltage value, the preset values at least comprise the first voltage preset value, and the control factor for preventing the output voltage from being over-voltage can be fully added into the obtained first control quantity. Then, the first control quantity is subjected to proportion adjustment and amplitude limiting in sequence to obtain a second control quantity for controlling the voltage reduction module and the first control quantity is subjected to amplitude limiting to obtain a third control quantity for controlling the voltage boosting module, so that the whole circuit is in a full-load section or a full-input voltage range, the second control quantity and the third control quantity obtained after processing both follow the linear change of the first control quantity, the sudden change of current or voltage of the conversion circuit caused by the sudden change of a control signal is effectively prevented, and the stability of the conversion circuit in the control process is ensured.
Generally speaking, the control method of the invention can not only execute various basic control strategies (such as basic control strategies for controlling electrical parameters such as input current, input voltage or output voltage to be kept constant) to ensure the normal work of the conversion circuit, but also can further prevent the overvoltage of the output voltage of the conversion circuit by conducting control on the first switch, effectively reduce the complexity of the control process and improve the stability.
(2) The electrical parameters also comprise actual input current values, and the preset values also comprise first current preset values, so that the normal operation of the conversion circuit can be ensured by a basic control strategy for controlling the input current to be constant, and the overvoltage of the output voltage of the circuit can be effectively prevented.
In addition, by configuring double closed-loop control modules, namely a first closed-loop control module and a second closed-loop control module, the first closed-loop control module outputs an adjusting coefficient according to feedback given deviation of an actual output voltage value, so that a given current value of the second closed-loop control module is corrected through the adjusting coefficient, and a first control quantity output by the second closed-loop control module can be influenced by the feedback condition of the actual output voltage value, so that the first control quantity which can meet both basic control strategies and prevent output voltage overvoltage can be output.
(3) The product of B1 and the scaling factor K1 in the clipping range is 1, and the third control amount is always limited to the minimum clipping value before the second control amount linearly increases to 1 with the first control amount. Meanwhile, after the second control amount reaches and stabilizes at 1, the third control amount starts to increase linearly. In other words, the configuration enables inflection points to appear on the variation curves of the second control quantity and the third control quantity along with the first control quantity, so that the situation that the first switch of the voltage reduction module, the second switch of the voltage boost module and the third switch are adjusted at the same time does not occur, and the stability of the conversion circuit in the control process is further improved.
(4) The first switch, the second switch and the third switch are all controllable switches suitable for being modulated by PWM signals, the inverter unit comprises a first diode, the first switch and the corresponding inductor jointly form an equivalent basic Buck circuit, and therefore a new topology is formed on the basis of a traditional double-inductor current type push-pull circuit, and the inverter unit is suitable for preventing output voltage from being overvoltage and facilitating stable control of the output voltage to enable the output voltage to work normally through the control method.
(5) The control device corresponds to the aforementioned control method, and thus has the same advantages as the control method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural diagram of a conventional dual inductor current type push-pull circuit;
FIG. 2 is a typical control loop of the circuit of FIG. 1;
FIG. 3 is a block diagram of a conversion circuit according to an embodiment of the present invention;
FIG. 4 is a diagram of a control loop structure of a first generating unit according to an embodiment of the present invention;
FIG. 5 is a schematic processing diagram of a second generating unit according to an embodiment of the present invention;
FIG. 6 is a graph illustrating the result of processing the first control variable according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are presently preferred embodiments of the invention and are not to be taken as an exclusion of other embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence.
In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting.
In the claims, the specification and the drawings of the present invention, unless otherwise specifically limited, the term "connected", as used herein, may include a direct connection or an indirect connection; the term "coupled", as used herein, means that the two electrical modules have a particular circuit function when connected.
Referring to fig. 3, an embodiment of the present invention first provides a boost converter circuit, which is used for boosting a dc input power and then outputting the boosted input power, and includes an inverter unit, a transformer, and a rectifier unit, which are coupled in sequence, so as to form an isolated boost topology. In this embodiment, the input power source is a dc power source, and may be various batteries.
The inverter unit comprises a first diode D1, a first switch S1, a second switch S2, a third switch S3, a first inductor L1 and a second inductor L2, and forms a first branch, a second branch and a third branch. The first switch S1 is adapted to form a voltage step-down module with the first inductor L1 or the second inductor L2, and the second switch S2 and the third switch S3 are adapted to form a voltage step-up module with the first inductor L1 and the second inductor L2. In this embodiment, the first switch S1, the first diode D1, and the second switch S2 are all semiconductor controllable switches, and are adapted to be modulated by a PWM signal, and may specifically be MOS transistors.
Specifically, the first branch circuit includes the first switch S1 and a first diode D1 connected in series, the first switch S1 is connected to the positive electrode of the input power source, and the anode of the first diode D1 is connected to the negative electrode of the input power source. The second branch comprises a first inductor L1 and a second switch S2 which are connected in series with each other. The first inductor L1 is connected to the common point of the first switch S1 and the first diode D1, and the second switch S2 is connected to the negative pole of the input power source. The third branch comprises a second inductor L2 and a third switch S3 which are connected in series, the second inductor L2 is connected with the common point of the first switch S1 and the first diode D1, and the third switch S3 is connected with the negative pole of the input power supply.
The primary winding of the transformer connects the common point of the second switch S2 and the first inductor L1 and the common point of the third switch S3 and the second inductor L2. The rectifying unit is a bridge rectifying circuit composed of four rectifying diodes (D2, D3, D4 and D5), the input end of the bridge rectifying circuit is connected with the secondary winding of the transformer, and the output end of the bridge rectifying circuit outputs boosted direct-current electric energy.
Since the operation of the isolated boost topology is the prior art and is not the focus of the present invention, the present invention will not be described in detail. However, as can be seen from the above description and the accompanying drawings, the conversion circuit according to the embodiment of the present invention includes a plurality of switches and two inductors, the first switch S1 is adapted to form a voltage step-down module (i.e. a Buck circuit) with the corresponding inductor, and the second switch S2 and the third switch S3 are adapted to form a voltage step-up module with the corresponding inductor, compared with the conventional dual-inductor current type push-pull circuit, the improved circuit has the voltage step-down module, and can reduce the output voltage of the whole conversion circuit by conducting and controlling the first switch S1, so that the improved circuit is suitable for effectively controlling the output voltage of the dual-inductor current type push-pull circuit, preventing the output voltage from being over-voltage, and further making the conversion circuit suitable for realizing wide-range voltage regulation.
With reference to fig. 3 to 5, based on the above-mentioned conversion circuit, an embodiment of the present invention further provides a method for controlling the conversion circuit, including the following steps.
One or more electrical parameters of the circuit and one or more preset values that are preset and correspond to the electrical parameters are obtained. The electrical parameters at least comprise an actual output voltage value Ubus of the circuit, and the preset values at least comprise a first voltage preset value Ubusref corresponding to the actual output voltage value Ubus. It will be appreciated that the electrical parameter comprises an actual output voltage value, an actual input voltage value, an actual output current value or an actual input current value.
A first control amount is obtained based on the acquired electrical parameter and a preset value. It is understood that, based on the electrical parameters and the preset values, it is generally possible to input each electrical parameter and preset value as a feedback value and a given value, respectively, to the corresponding closed-loop control loops, and correspondingly couple each closed-loop control loop to obtain the first control quantity, and the specific manner of this embodiment will be described in detail below.
And carrying out proportional adjustment and first amplitude limiting processing on the first control quantity in sequence to obtain a second control quantity, carrying out second amplitude limiting processing on the first control quantity to obtain a third control quantity, and enabling the second control quantity and/or the third control quantity to change linearly along with the first control quantity. In this embodiment, the first control quantity, the second control quantity and the third control quantity are all PWM signals. The first control amount is a whole PWM signal D, the second control amount is a first PWM signal DS1 for controlling the first switch S1, and the third control amount includes a second PWM signal DS2 and a third PWM signal DS3 for controlling the second switch S2 and the third switch S3, respectively. The second and third PWM signals DS2 and DS3 are of the same magnitude and 180 ° out of phase.
And respectively controlling the first switch S1 of the buck module and the second switch S2 and the third switch S3 of the boost module by using the second control quantity and the third control quantity.
In this embodiment, the control method has an advantage of simplifying control complexity on the basis of the improved circuit. Specifically, the control method of the present invention first obtains an electrical parameter of the circuit and a corresponding preset value, and obtains a first control quantity capable of reflecting the overall control requirement based on the electrical parameter and the preset value, wherein the electrical parameter at least comprises an actual output voltage value Ubus, the preset value at least comprises a first voltage preset value Ubusref, and a control factor for preventing the output voltage from being over-voltage can be sufficiently added to the obtained first control quantity. Then, the first control quantity is subjected to proportion adjustment and amplitude limiting in sequence to obtain a second control quantity for controlling the voltage reduction module and the first control quantity is subjected to amplitude limiting to obtain a third control quantity for controlling the voltage boosting module, so that the whole circuit is in a full-load section or a full-input voltage range, the second control quantity and the third control quantity obtained after processing both follow the linear change of the first control quantity, the sudden change of current or voltage of the conversion circuit caused by the sudden change of a control signal is effectively prevented, and the stability of the conversion circuit in the control process is ensured.
Generally speaking, the control method of the invention can not only execute various basic control strategies (such as basic control strategies for controlling electrical parameters such as input current, input voltage or output voltage to be kept constant) to ensure the normal operation of the conversion circuit, but also have diversified control means, and can further prevent the overvoltage of the output voltage of the conversion circuit by conducting and controlling the first switch S1, and the complexity of the control process is effectively reduced, and the stability is improved.
Further, in this embodiment, the electrical parameter further includes an actual input current value Ibat of the circuit, and the preset value further includes a first current preset value Ibatref corresponding to the actual input current value Ibat, so that a basic control strategy for controlling the input current to be constant can be used to ensure the normal operation of the conversion circuit, and the output voltage of the circuit can be effectively prevented from being over-voltage. It will be appreciated that in other embodiments, it is possible to substitute the actual input current value Ibat for other electrical parameters, such as the input voltage or the output voltage, to form other different basic control strategies.
Preferably, the step of obtaining the first control quantity based on the acquired electrical parameter and the preset value comprises the following steps.
And inputting the actual output voltage value Ubus and the first voltage preset value Ubusref as a feedback quantity and a given quantity respectively into a first closed-loop control module, wherein the output quantity of the first closed-loop control module is an adjusting coefficient X.
And inputting the actual input current value Ibat and the first preset current value Ibatref and the output quantity of the first closed-loop control module, namely the value multiplied by the adjusting coefficient X into a second closed-loop control module as a feedback quantity and a given quantity respectively.
And taking the output quantity of the second closed-loop control module as the first control quantity, namely the integral PWM signal D.
Therefore, by configuring the double closed-loop control modules, namely the first closed-loop control module and the second closed-loop control module, the first closed-loop control module outputs the regulating coefficient X according to the feedback given deviation of the actual output voltage value Ubus, so that the given current value of the second closed-loop control module is corrected through the regulating coefficient X, the first control quantity output by the second closed-loop control module can be influenced by the feedback condition of the actual output voltage value Ubus, and the first control quantity which can meet both the basic control strategy and the output voltage overvoltage prevention can be output.
Specifically, for the ratio adjustment and the amplitude limiting processing, the embodiment of the present invention further has the following configurations: and defining the proportionality coefficient of K1 and the amplitude limiting range of A1-A2 for sequentially carrying out proportion adjustment and amplitude limiting on the first control quantity in the process of obtaining the second control quantity. And defining the range of the amplitude limiting processing for carrying out amplitude limiting processing on the first control quantity in the process of obtaining the third control quantity as B1-B2. Wherein, the A1 and A2 are 0 and 1 respectively, the B1 is more than 0.5, the product of the B1 and the K1 is 1, and the B2 is less than 1. In the embodiment, the proportionality coefficient K1 is 1/0.52, and the B1 is 0.52.
Referring to fig. 6, in the present embodiment, the product of B1 and the scaling factor K1 in the clipping range is 1, and the third control amount is always limited to the minimum clipping value before the second control amount linearly increases to 1 with the first control amount. Meanwhile, after the second control amount reaches and stabilizes at 1, the third control amount starts to increase linearly. In other words, the configuration makes the inflection points of the variation curves of the second control amount and the third control amount along with the first control amount, so that the situation that the first switch S1 of the buck module is adjusted simultaneously with the second switch S2 and the third switch S3 of the boost module does not occur, and the stability of the conversion circuit in the control process is further improved.
Correspondingly, the embodiment of the invention also provides a control device corresponding to the control method, which is also used for controlling the conversion circuit and comprises an acquisition unit, a first generation unit and a second generation unit.
The acquisition unit is used for acquiring one or more electrical parameters of the circuit and one or more preset values which are preset and correspond to the electrical parameters. The electrical parameters at least comprise an actual output voltage value Ubus of the circuit, and the preset values at least comprise a first voltage preset value Ubusref corresponding to the actual output voltage value Ubus.
The first generation unit calculates a first control amount based on the acquired electrical parameter and a preset value.
The second generation unit is used for carrying out proportion adjustment and first amplitude limiting processing on the first control quantity in sequence to obtain a second control quantity used for controlling the voltage reduction module, carrying out second amplitude limiting processing on the first control quantity to obtain a third control quantity used for controlling the voltage boosting module, and enabling the second control quantity and/or the third control quantity to follow the first control quantity to change linearly. In this embodiment, the first control quantity, the second control quantity and the third control quantity are all PWM signals. The first control amount is a whole PWM signal D, the second control amount is a first PWM signal DS1 for controlling the first switch S1, and the third control amount includes a second PWM signal DS2 and a third PWM signal DS3 for controlling the second switch S2 and the third switch S3, respectively. The second and third PWM signals DS2 and DS3 are of the same magnitude and 180 ° out of phase.
Specifically, the electrical parameter obtained by the obtaining unit further includes an actual input current value Ibat of the circuit, and the preset value obtained by the obtaining unit further includes a first preset current value Ibatref corresponding to the actual input current value Ibat. The first generation unit includes a first closed loop control module and a second closed loop control module. The feedback quantity and the given quantity of the first closed-loop control module are respectively the actual output voltage value Ubus and the first voltage preset value Ubusref, and the output quantity is an adjusting coefficient X. The feedback quantity and the given quantity of the second closed-loop control module are respectively the actual input current value Ibat and the value obtained by multiplying the first preset current value Ibatref by the adjusting coefficient X, and the output quantity is the first control quantity, namely the overall PWM signal D.
Further, the second generating unit includes a first scale adjusting module, a first clipping processing module, and a second clipping processing module. The first proportion adjusting module is used for carrying out proportion adjustment on the first control quantity, and the first amplitude limiting processing module is used for carrying out first amplitude limiting processing on the first control quantity subjected to proportion adjustment again to obtain the second control quantity. The scaling coefficient of the first scale adjusting module is K1, and the amplitude limiting range of the first amplitude limiting processing module is 0-1. The second amplitude limiting processing module is used for carrying out second amplitude limiting processing on the first control quantity and obtaining a third control quantity. The clipping range of the second clipping processing module is B1-B2; the B1 is greater than 0.5 and its product with the K1 is 1; the B2 is less than 1.
It can be seen that the control device of the conversion circuit of this embodiment has a material structure corresponding to the control method, and thus has the same advantages as the control method, and the description of this embodiment is omitted.
The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting. Modifications, equivalents and other improvements which may occur to those skilled in the art and which may be made to the embodiments of the invention or portions thereof through a reasonable analysis, inference or limited experimentation, in light of the common general knowledge, the common general knowledge in the art and/or the prior art, are intended to be within the scope of the invention.
Claims (10)
1. A method of controlling a conversion circuit, comprising: the circuit comprises a first switch, a second switch, a third switch and two inductors; the first switch is suitable for forming a voltage reduction module with the inductor, and the second switch and the third switch are suitable for forming a voltage boosting module with the two inductors;
the method comprises the following steps:
acquiring one or more electrical parameters of the circuit and one or more preset values which are preset and correspond to the electrical parameters; wherein the electrical parameters at least comprise an actual output voltage value of the circuit, and the preset values at least comprise a first voltage preset value corresponding to the actual output voltage value;
obtaining a first control quantity based on the acquired electrical parameter and a preset value;
carrying out proportional adjustment and amplitude limiting processing on the first control quantity to obtain a second control quantity, carrying out amplitude limiting processing on the first control quantity to obtain a third control quantity, and enabling the second control quantity and/or the third control quantity to linearly change along with the first control quantity;
and respectively controlling the voltage reduction module and the voltage boosting module by adopting the second control quantity and the third control quantity.
2. A method of controlling a conversion circuit as claimed in claim 1, characterized by: the electrical parameter further comprises an actual input current value of the circuit, and the preset value further comprises a first current preset value corresponding to the actual input current value;
the obtaining of the first control quantity based on the acquired electrical parameter and the preset value includes:
inputting the actual output voltage value and the first voltage preset value into a first closed-loop control module as a feedback quantity and a given quantity respectively;
the actual input current value and the value obtained by multiplying the first current preset value by the output quantity of the first closed-loop control module are respectively used as a feedback quantity and a given quantity to be input into a second closed-loop control module;
and taking the output quantity of the second closed-loop control module as the first control quantity.
3. A method of controlling a conversion circuit as claimed in claim 1, characterized by:
defining a proportionality coefficient K1 and a limiting processing range A1-A2 for carrying out proportion adjustment and limiting processing on the first control quantity in the process of obtaining the second control quantity; defining the range of amplitude limiting processing for amplitude limiting processing on the first control quantity in the process of obtaining the third control quantity as B1-B2;
wherein A1 and A2 are 0 and 1, respectively; the B1 is greater than 0.5 and its product with the K1 is 1; the B2 is less than 1.
4. A control method of a conversion circuit according to any one of claims 1 to 3, characterized in that: the first switch, the second switch and the third switch are all controllable switches suitable for being modulated by PWM signals;
the first control quantity, the second control quantity and the third control quantity are PWM signals;
wherein the second control quantity is a first PWM signal for controlling the first switch; the third control amount includes a second PWM signal and a third PWM signal for controlling the second switch and the third switch, respectively;
the second and third PWM signals are the same in magnitude and 180 ° out of phase.
5. The control method of a conversion circuit according to claim 4, wherein the conversion circuit is used for boosting a direct current input power supply and outputting the boosted direct current input power supply, and comprises an inverter unit, a transformer and a rectifier unit which are coupled in sequence;
the inversion unit comprises a first diode, the first switch, a second switch, a third switch, a first inductor and a second inductor which form the two inductors, and a first branch circuit, a second branch circuit and a third branch circuit are formed; the first branch circuit comprises the first switch and a first diode which are connected in series, the first switch is connected with the anode of the input power supply, and the anode of the first diode is connected with the cathode of the input power supply; the second branch circuit comprises a first inductor and a second switch which are connected in series; the first inductor is connected with a common point of the first switch and the first diode, and the second switch is connected with the negative pole of the input power supply; the third branch circuit comprises a second inductor and a third switch which are connected in series, the second inductor is connected with the common point of the first switch and the first diode, and the third switch is connected with the negative electrode of the input power supply;
the primary winding of the transformer is connected with the common point of the second switch and the first inductor and the common point of the third switch and the second inductor;
the input end of the rectifying unit is connected with the secondary winding of the transformer, and the output end of the rectifying unit outputs direct current electric energy.
6. A control device for a conversion circuit, characterized in that: the circuit comprises a first switch, a second switch, a third switch and two inductors; the first switch is suitable for forming a voltage reduction module with the inductor, and the second switch and the third switch are suitable for forming a voltage boosting module with the two inductors;
the device comprises:
the acquisition unit is used for acquiring one or more electrical parameters of the circuit and one or more preset values which are preset and correspond to the electrical parameters; wherein the electrical parameters at least comprise an actual output voltage value of the circuit, and the preset values at least comprise a first voltage preset value corresponding to the actual output voltage value;
a first generation unit that calculates a first control amount based on the acquired electrical parameter and a preset value; and
and the second generating unit is used for carrying out proportion adjustment and amplitude limiting processing on the first control quantity to obtain a second control quantity for controlling the voltage reduction module, carrying out amplitude limiting processing on the first control quantity to obtain a third control quantity for controlling the voltage boosting module, and enabling the second control quantity and/or the third control quantity to linearly change along with the first control quantity.
7. The control device of a conversion circuit as claimed in claim 6, characterized in that: the electrical parameter acquired by the acquisition unit further comprises an actual input current value of the circuit, and the preset value acquired by the acquisition unit further comprises a first current preset value corresponding to the actual input current value;
the first generating unit comprises a first closed-loop control module and a second closed-loop control module;
the feedback quantity and the given quantity of the first closed-loop control module are respectively the actual output voltage value and the first voltage preset value, and the output quantity is an adjusting coefficient;
the feedback quantity and the given quantity of the second closed-loop control module are respectively the actual input current value and the value obtained by multiplying the first current preset value by the regulating coefficient, and the output quantity of the second closed-loop control module is the first control quantity.
8. The control device of a conversion circuit as claimed in claim 6, characterized in that: the second generating unit comprises a first proportion adjusting module, a first amplitude limiting processing module and a second amplitude limiting processing module;
the first proportion adjusting module and the first amplitude limiting processing module are used for respectively carrying out proportion adjustment and first amplitude limiting processing on the first control quantity and obtaining the second control quantity; the first proportion adjusting module has a proportionality coefficient of K1, and the first amplitude limiting processing module has an amplitude limiting range of 0-1;
the second amplitude limiting processing module is used for carrying out second amplitude limiting processing on the first control quantity and obtaining a third control quantity; the clipping range of the second clipping processing module is B1-B2; the B1 is greater than 0.5 and its product with the K1 is 1; the B2 is less than 1.
9. A control device of a conversion circuit according to any one of claims 6 to 8, characterized in that: the first switch, the second switch and the third switch are all controllable switches suitable for being modulated by PWM signals;
the first control quantity, the second control quantity and the third control quantity are PWM signals;
wherein the second control quantity is a first PWM signal for controlling the first switch; the third control amount includes a second PWM signal and a third PWM signal for controlling the second switch and the third switch, respectively;
the second and third PWM signals are the same in magnitude and 180 ° out of phase.
10. The control device of a conversion circuit as claimed in claim 9, characterized in that: the conversion circuit is used for boosting a direct-current input power supply and then outputting the boosted direct-current input power supply and comprises an inversion unit, a transformer and a rectification unit which are coupled in sequence;
the inversion unit comprises a first diode, the first switch, a second switch, a third switch, a first inductor and a second inductor which form the two inductors, and a first branch circuit, a second branch circuit and a third branch circuit are formed; the first branch circuit comprises the first switch and a first diode which are connected in series, the first switch is connected with the anode of the input power supply, and the anode of the first diode is connected with the cathode of the input power supply; the second branch circuit comprises a first inductor and a second switch which are connected in series; the first inductor is connected with a common point of the first switch and the first diode, and the second switch is connected with the negative pole of the input power supply; the third branch circuit comprises a second inductor and a third switch which are connected in series, the second inductor is connected with the common point of the first switch and the first diode, and the third switch is connected with the negative electrode of the input power supply;
the primary winding of the transformer is connected with the common point of the second switch and the first inductor and the common point of the third switch and the second inductor;
the input end of the rectifying unit is connected with the secondary winding of the transformer, and the output end of the rectifying unit outputs direct current electric energy.
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| CN202110870329.3A CN113691136B (en) | 2021-07-30 | 2021-07-30 | Control method and control device of conversion circuit |
| PCT/CN2022/070968 WO2023005159A1 (en) | 2021-07-30 | 2022-01-10 | Control method and control apparatus for conversion circuit |
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| CN202110870329.3A CN113691136B (en) | 2021-07-30 | 2021-07-30 | Control method and control device of conversion circuit |
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| CN113691136B (en) * | 2021-07-30 | 2022-08-09 | 科华数据股份有限公司 | Control method and control device of conversion circuit |
| CN114285278B (en) * | 2021-12-27 | 2024-03-19 | 厦门科华数能科技有限公司 | Inverter control method and control device |
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| US6906930B2 (en) * | 2003-06-26 | 2005-06-14 | Delta Electronics, Inc. | Structure and method for an isolated boost converter |
| CN100446395C (en) * | 2007-04-28 | 2008-12-24 | 电子科技大学 | Voltage-stabilizing switch power source with voltage ripple detection circuit |
| CN104617777B (en) * | 2015-02-02 | 2017-02-22 | 重庆大学 | High-gain low-switching-voltage stress interleaved BOOST converter and working method |
| MY181704A (en) * | 2016-02-05 | 2021-01-04 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Charge method, adapter and mobile terminal |
| CN106787775B (en) * | 2016-12-30 | 2019-08-13 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
| US10811987B2 (en) * | 2017-03-31 | 2020-10-20 | Schneider Electric It Corporation | Bi-directional DC-DC converter with load and source synchronized power control |
| CN112054686B (en) * | 2020-08-17 | 2022-09-02 | 漳州科华技术有限责任公司 | Control method based on converter circuit and related device |
| CN113014098B (en) * | 2021-04-09 | 2022-05-17 | 哈尔滨工业大学（威海） | Fuzzy self-tuning PID control algorithm for interleaved parallel bidirectional DC/DC converter |
| CN113691136B (en) * | 2021-07-30 | 2022-08-09 | 科华数据股份有限公司 | Control method and control device of conversion circuit |
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