CN103378727B - A kind of DC/DC for bidirectional constant and control method thereof - Google Patents
A kind of DC/DC for bidirectional constant and control method thereof Download PDFInfo
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Abstract
A kind of DC/DC for bidirectional constant, comprise driver module, driver module comprises the first switch element, second switch unit, the first electric capacity, the second electric capacity and inductance, first switch element first end is connected with the first power supply first end, first switch element second end is connected with inductance first end, second switch unit first end respectively, inductance second end is connected with second source first end, second source second end is connected with second switch unit second end, the first power supply second end, first electric capacity is attempted by the first both ends of power, and the second electric capacity is attempted by second source two ends; Sampling module, gathers inductive current, the first mains side electric current or second source side electric current; Control module, according to target current, inductive current and the first mains side electric current or second source side electric current, regulate the first switch element and second switch unit duty ratio, and realize bidirectional constant by control first switch element and the complementary conduction mode of second switch unit.This invention simplifies bidirectional constant control method.
Description
Technical field
The present invention is specifically related to a kind of DC/DC for bidirectional constant and control method thereof.
Background technology
The existing DC-DC power supply for bidirectional constant (DC/DC), general needs could realize constant current by the switching constant current mode of driver module and the control method of complexity, as shown in the circuit diagram of the driver module of Fig. 1, the existing DC/DC for bidirectional constant comprises two kinds of constant current modes, i.e. decompression mode and boost mode, in buck mode, namely electric current flows to low-pressure side ULow by high-pressure side UHigh, the upper brachium pontis T1 of software only control IGBT, lower brachium pontis T2 remain off in constant current process, when T1 ends, carry out afterflow by the sustained diode 2 of T2; Under boost mode, namely electric current flows to high-pressure side UHigh by low-pressure side ULow, and the lower brachium pontis T2 of software only control IGBT, upper brachium pontis T1 remain off in constant current process, when T2 ends, carries out afterflow by the sustained diode 1 of T1.
There is following defect in the above-mentioned existing DC/DC for bidirectional constant:
1) DC/DC is when constant current, owing to only controlling single IGBT brachium pontis (T1 or T2), cause when output current is less, the energy that inductance L stores when the IGBT brachium pontis conducting controlled is less, be not enough to holding load turn off at the IGBT brachium pontis controlled, to the demand of energy during diode continuousing flow, thus cause the inductive current when the IGBT brachium pontis controlled turns off to there will be the situation being continuously 0 peace, namely there is interrupted situation in inductive current, thus cause current ripples to become large;
2) in the process of constant current mode switching, first software will control electric current and reduce to 0, is switched to corresponding constant current mode subsequently again.In handoff procedure, Water demand size of current is just can be switched to corresponding operational mode after 0, otherwise has larger current and impact.Therefore need to design corresponding algorithm for judging the switching of constant current mode and controlling, this adds increased the algorithm complex of software.
Summary of the invention
The present invention is the above-mentioned technical problem that the existing DC/DC for bidirectional constant of solution exists, and provides a kind of easy DC/DC for bidirectional constant and control method thereof, can improve stability and the reliability of DC/DC.
Technical scheme of the present invention is:
For a DC/DC for bidirectional constant, comprising:
Driver module, described driver module comprises the first switch element, second switch unit, first electric capacity, second electric capacity and inductance, the first end of described first switch element is connected with the first end of the first power supply, second end of the first switch element respectively with the first end of inductance, the first end of second switch unit is connected, second end of inductance is connected with the first end of second source, second end of second source respectively with the second end of second switch unit, second end of the first power supply is connected, described first electric capacity is attempted by the two ends of the first power supply, second electric capacity is attempted by the two ends of second source, the voltage that wherein the first power supply provides is greater than the voltage that second source provides, and the second end polarity of the first power supply is identical with the polarity of the second end of second source,
Sampling module, for gathering inductive current, and gathers the electric current of the first mains side or the electric current of second source side; And
Control module, for according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit.
The control method of a kind of DC/DC for bidirectional constant, the described DC/DC for bidirectional constant comprises sampling module, control module and driver module, described driver module comprises the first switch element, second switch unit, first electric capacity, second electric capacity and inductance, the first end of described first switch element is connected with the first end of the first power supply, second end of the first switch element respectively with the first end of inductance, the first end of second switch unit is connected, second end of inductance is connected with the first end of second source, second end of second source respectively with the second end of second switch unit, second end of the first power supply is connected, described first electric capacity is attempted by the two ends of the first power supply, second electric capacity is attempted by the two ends of second source, the voltage that first power supply provides is greater than the voltage that second source provides, and the second end polarity of the first power supply is identical with the polarity of the second end of second source, the control method of the described DC/DC for bidirectional constant comprises the following steps:
Step S1: sampling module gathers inductive current, and gather the electric current of the first mains side or the electric current of second source side;
Step S2: control module is according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit.
The above-mentioned DC/DC for bidirectional constant and control method thereof, because control module is according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit, make the present invention by means of only the switching regulating the first switch element of complementary conducting and the duty ratio of second switch unit just can realize electric current, thus simplify bidirectional constant control method, improve stability and the reliability of DC/DC.
Accompanying drawing explanation
Fig. 1 is the driver module circuit diagram of existing DC/DC.
The structured flowchart of the embodiment that the DC/DC that Fig. 2 is used for bidirectional constant for the present invention provides.
Fig. 3 is the schematic diagram that outer shroud of the present invention regulates and inner ring regulates.
The flow chart of the embodiment that the control method that Fig. 4 is used for the DC/DC of bidirectional constant for the present invention provides.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present inventor finds, the existing DC/DC(for bidirectional constant is as shown in Figure 1) the following defect that exists: 1) when constant current, due to by means of only control single IGBT brachium pontis (T1 or T2), cause when output current is less, the energy that inductance L stores when the IGBT brachium pontis conducting controlled is less, be not enough to holding load turn off at the IGBT brachium pontis controlled, to the demand of energy during diode continuousing flow, thus cause the inductive current when the IGBT brachium pontis controlled turns off to there will be the situation being continuously 0 peace, namely there is interrupted situation in inductive current, thus cause current ripples to become large, 2) in the process of constant current mode switching, first software will control electric current and reduce to 0, is switched to corresponding constant current mode subsequently again.In handoff procedure, Water demand size of current is just can be switched to corresponding operational mode after 0, otherwise has larger current and impact.Like this owing to needing to design corresponding algorithm for judging the switching of constant current mode and controlling, this adds increased the algorithm complex of software.
In order to solve the above-mentioned defect that the existing DC/DC for bidirectional constant exists, the present inventor is through oneself creatively working, and finally propose a kind of DC/DC for bidirectional constant, as shown in Figure 2, this DC/DC being used for bidirectional constant comprises:
Driver module 3, described driver module 3 comprises the first switch element 31, second switch unit 32, first electric capacity C1, second electric capacity C2 and inductance L, the first end of described first switch element 31 is connected with the first end of the first power supply 1, second end of the first switch element 31 respectively with the first end of inductance L, the first end of second switch unit 32 is connected, second end of inductance L is connected with the first end of second source 2 respectively, second end of second source 2 respectively with the second end of second switch unit 32, second end of the first power supply 1 is connected, described first electric capacity C1 is attempted by the two ends of the first power supply 1, second electric capacity C2 is attempted by the two ends of second source 2, the voltage that wherein the first power supply 1 provides is greater than the voltage that second source 2 provides, and the second end polarity of the first power supply 1 is identical with the polarity of the second end of second source 2,
Sampling module 4, (be understandable that for gathering current inductive current, this inductive current refers to the electric current gathered at the first end of inductance L at sampling module 4 or the electric current gathered at the second end of inductance L), and gather the electric current of the first power supply 1 side or the electric current of second source 2 side; And
Control module 5, for according to target current, the inductive current that sampling module 4 gathers and the electric current of the first power supply 1 side or the electric current of second source 2 side, regulate the duty ratio of the first switch element 31 and second switch unit 32, and realize bidirectional constant by the mode of control first switch element 31 and the complementary conducting of second switch unit 32.
Be understandable that, above-mentioned first switch element 31 and second switch unit 32 are the devices with switching characteristic, such as, it can be metal-oxide-semiconductor or IGBT pipe, certainly, described first switch element 31, second switch unit 32 can also have switching characteristic for other is arbitrary and can realize the device of above-mentioned functions, are not introduced one by one at this.
The present inventor additionally provides the control method of a kind of DC/DC for bidirectional constant accordingly, the described DC/DC for bidirectional constant comprises sampling module, control module and driver module, described driver module comprises the first switch element, second switch unit, first electric capacity, second electric capacity and inductance, the first end of described first switch element is connected with the first end of the first power supply, second end of the first switch element respectively with the first end of inductance, the first end of second switch unit is connected, second end of inductance is connected with the first end of second source respectively, second end of second source respectively with the second end of second switch unit, second end of the first power supply is connected, described first electric capacity is attempted by the two ends of the first power supply, second electric capacity is attempted by the two ends of second source, the voltage that first power supply provides is greater than the voltage that second source provides, and the second end polarity of the first power supply is identical with the polarity of the second end of second source, the control method of the described DC/DC for bidirectional constant comprises the following steps:
Step S1: sampling module gathers inductive current, and gather the electric current of the first mains side or the electric current of second source side;
Step S2: control module is according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit.
Being understandable that, there is direction in electric current, and its direction can set arbitrarily, is below the specific implementation process of the above-mentioned steps S2 provided based on different current settings directions:
When electric current is to flow to second source side for timing from the first mains side, described step S2 specifically comprises the following steps:
Steps A 1: control module is according to target current I
2with the current actual current I that sampling module gathers
1calculate Current outer loop input value OuterPIin, OuterPIin=I
2-I
1;
Steps A 2: calculate the proportional P of Current outer loop and the integration item I of Current outer loop according to Current outer loop input value OuterPIin, and calculate Current outer loop output valve OuterPIout, P=OuterPIin*Kp1, I=OuterPIin*Ki1+ △ x, OuterPIout=P+I, wherein △ x is the integration item of last outer shroud, and its initial value is 0;
Steps A 3: control module calculates current inner ring input value InnerPIin, InnerPIin=OuterPIout-IL1 according to the current inductive current IL1 of Current outer loop output valve OuterPIout and sampling module collection;
Steps A 4: calculate the proportional P ' of current inner ring and the integration item I ' of current inner ring according to current inner ring input value InnerPIin, and calculate current inner ring output valve InnerPIout, P '=InnerPIin*Kp2, I '=InnerPIin*Ki2+ △ y, InnerPIout=P '+I ', wherein △ y is the integration item of last inner ring, and its initial value is D1*K;
Steps A 5: the duty ratio controlling the first switch element and second switch unit according to current inner ring output valve InnerPIout, the duty ratio of described first switch element is InnerPIout/K, and the duty ratio of second switch unit is 1-InnerPIout/K.
Wherein, Kp1 is outer shroud proportionality coefficient, and Kp2 is inner ring proportionality coefficient, and Ki1 is outer shroud integral coefficient, and Ki2 is inner ring integral coefficient, and K is occupy ratio, and D1 is the initial duty cycle of the first switch element.
Be understandable that, the initial duty cycle D1 of described first switch element can be arranged arbitrarily by designer.Preferably, the initial duty cycle D1 of described first switch element is set to the ratio that second source provides voltage and the first supplies voltages, object is that the larger current that may cause after avoiding the first switch element or second switch unit just to work is impacted, thus ensure that the safety of the present invention for the DC/DC device of bidirectional constant.
It should be noted that at this, DC/DC for bidirectional constant of the present invention and control method thereof, required constant target current both can be the electric current of the first mains side, also can be the electric current of second source side, it is mainly determined according to the needs of user, therefore according to the different needs of user, the target current I in described steps A 1
2with the current actual current I that sampling module gathers
1there is following corresponding relation:
When needing constant target current I
2when being the electric current of the first mains side, the current actual current I that sampling module gathers
1it is then the current value of the first mains side;
When needing constant target current I
2during electric current for second source side, the current actual current I that sampling module gathers
1it is then the current value of second source side.
When electric current with from second source effluent to the first mains side for timing, described step S2 specifically comprises the following steps:
Step B1: control module is according to target current I
2with the current actual current I that sampling module gathers
1calculate Current outer loop input value OuterPIin, OuterPIin=I
2-I
1;
Step B2: calculate the proportional P of Current outer loop and the integration item I of Current outer loop according to Current outer loop input value OuterPIin, and calculate Current outer loop output valve OuterPIout, P=OuterPIin*Kp1, I=OuterPIin*Ki1+ △ x, OuterPIout=P+I, wherein △ x is the integration item of last outer shroud, and its initial value is 0;
Step B3: control module calculates current inner ring input value InnerPIin, InnerPIin=OuterPIout-IL1 according to the current inductive current IL1 of Current outer loop output valve OuterPIout and sampling module collection;
Step B4: calculate the proportional P ' of current inner ring and the integration item I ' of current inner ring according to current inner ring input value InnerPIin, and calculate current inner ring output valve InnerPIout, P '=InnerPIin*Kp2, I '=InnerPIin*Ki2+ △ y, InnerPIout=P '+I ', wherein △ y is the integration item of last inner ring, and its initial value is D2*K;
Step B5: the duty ratio controlling the first switch element and second switch unit according to current inner ring output valve InnerPIout, the duty ratio of described first switch element is 1-InnerPIout/K, and the duty ratio of second switch unit is InnerPIout/K;
Wherein, Kp1 is outer shroud proportionality coefficient, and Kp2 is inner ring proportionality coefficient, and Ki1 is outer shroud integral coefficient, and Ki2 is inner ring integral coefficient, and K is occupy ratio, and D2 is the initial duty cycle of second switch unit.
In like manner, the target current I in described step B1
2with the current actual current I that sampling module gathers
1there is following corresponding relation:
When needing constant target current I
2when being the electric current of the first mains side, the current actual current I that sampling module gathers
1it is then the current value of the first mains side;
When needing constant target current I
2during electric current for second source side, the current actual current I that sampling module gathers
1it is then the current value of second source side.
In addition, the initial duty cycle D2 of described second switch unit is preferably set to the difference of the ratio of the voltage that 1 voltage provided with second source and the first power supply provide.
In order to understand technical scheme of the present invention better, (consulting Fig. 3 in the lump) is made an explanation to portion of techniques noun below:
Outer shroud: the target that outer shroud regulates is given (the first mains side or second source side) the constant current order target value of user, and the object of adjustment is (the first mains side or second source side) current sampling data;
Inner ring: the target that inner ring regulates is the output valve that outer shroud obtains, and the object of adjustment is inductive current sampled value.
It should be noted that at this, above-mentioned outer shroud Proportional coefficient K p1, inner ring Proportional coefficient K p2, outer shroud integral coefficient Ki1, inner ring integral coefficient Ki2 and occupy ratio K, its concrete value is mainly relevant with the chip of the DC/DC inside for bidirectional constant and other hardware parameter, such as, occupy ratio K can be confirmed at first, occupy ratio K needs to select according to the operational bits of application chip support, it is chosen as the half of the operational bits that application chip is supported, as chip supports 32, occupy ratio K can be set to 2
16(65536).Secondly, the operating mode of the main DC/DC practical application according to being used for bidirectional constant of outer shroud Proportional coefficient K p1, inner ring Proportional coefficient K p2, outer shroud integral coefficient Ki1, inner ring integral coefficient Ki2 is adjusted and is obtained, the method of adjusting can change with operating mode, does not enumerate herein.Basic setting principle is: outer shroud coefficient of first adjusting, then inner ring coefficient of adjusting; First adjust Proportional coefficient K p, then the integral coefficient Ki that adjusts.
It should be noted that at this, above-mentioned first power supply and second source refer to can the energy device of energy supply and energy storage, such as it can be constant pressure source, battery etc., in addition, above-mentioned first power supply and second source are present in different operating states respectively, namely do not appear at same operating state and provide electric energy or storage of electrical energy, such as, when needing constant target current I
2when being the electric current of the first mains side, second source work (be used for energy supply or energy storage), the first power supply now does not then exist, and now its first mains side is then load or constant pressure source; When needing constant target current I
2during electric current for second source side, the first power work (be used for energy supply or energy storage), second source now does not then exist, and now its second source side is then load or constant pressure source.
In order to allow those skilled in the art understand better and to implement the present invention, carry out specifically describing to the present invention in the mode of specific embodiment below.
Shown in the flow chart of the embodiment that the control method as the DC/DC for bidirectional constant of Fig. 4 provides, in the present embodiment, electric current is to flow to the direction of second source side for positive direction from the first mains side, user needs constant electric current to be the electric current of second source side, and the control method for the DC/DC of bidirectional constant comprises the following steps:
Step 41: sampling module gathers current inductive current IL1, and gather the electric current I of current second source side
1;
Step 42: control module is according to target current I
2with the electric current I of the current second source side that sampling module gathers
1calculate Current outer loop input value OuterPIin, OuterPIin=I
2-I
1;
Step 43: calculate the proportional P of Current outer loop and the integration item I of Current outer loop according to Current outer loop input value OuterPIin, and calculate Current outer loop output valve OuterPIout, P=OuterPIin*Kp1, I=OuterPIin*Ki1+ △ x, OuterPIout=P+I, wherein △ x is the integration item of last outer shroud, and its initial value is 0;
Step 44: control module calculates current inner ring input value InnerPIin, InnerPIin=OuterPIout-IL1 according to the current inductive current IL1 of Current outer loop output valve OuterPIout and sampling module collection;
Step 45: calculate the proportional P ' of current inner ring and the integration item I ' of current inner ring according to current inner ring input value InnerPIin, and calculate current inner ring output valve InnerPIout, P '=InnerPIin*Kp2, I '=InnerPIin*Ki2+ △ y, InnerPIout=P '+I ', wherein △ y is the integration item of last inner ring, and its initial value is D1*K;
Step 46: the duty ratio controlling the first switch element and second switch unit according to current inner ring output valve InnerPIout, the duty ratio of described first switch element is InnerPIout/K, and the duty ratio of second switch unit is 1-InnerPIout/K.
Be understandable that, in concrete enforcement, user can arrange certain sampling period as required, and above-mentioned steps 41-step 46 can perform according to the sampling period circulation arranged, thus realizes bidirectional constant function better.
Wherein, Kp1 is outer shroud proportionality coefficient, and Kp2 is inner ring proportionality coefficient, and Ki1 is outer shroud integral coefficient, and Ki2 is inner ring integral coefficient, and K is occupy ratio, and D1 is the initial duty cycle of the first switch element.
It should be noted that at this, the parameter Kp1 of the present embodiment, Kp2, Ki1, Ki2 and K, its concrete value is with reference to above-mentioned explanation.In like manner, the initial duty cycle D1 of described first switch element is preferably set to the ratio that second source provides voltage and the first supplies voltages.
The control method of the DC/DC for bidirectional constant of this embodiment, just the switching of electric current can be realized by the duty ratio of the first switch element and second switch unit that regulate complementary conducting, thus simplify bidirectional constant control method, improve stability and the reliability of DC/DC; And owing to have employed double-loop control (comprising outer shroud to control and inner ring control), therefore can suppress the ripple of output current and improve dynamic responding speed, thus enhancing the performance of DC/DC.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the control method for the DC/DC of bidirectional constant, it is characterized in that, the described DC/DC for bidirectional constant comprises sampling module, control module and driver module, described driver module comprises the first switch element, second switch unit, first electric capacity, second electric capacity and inductance, the first end of described first switch element is connected with the first end of the first power supply, second end of the first switch element respectively with the first end of inductance, the first end of second switch unit is connected, second end of inductance is connected with the first end of second source, second end of second source respectively with the second end of second switch unit, second end of the first power supply is connected, described first electric capacity is attempted by the two ends of the first power supply, second electric capacity is attempted by the two ends of second source, the voltage that first power supply provides is greater than the voltage that second source provides, and the second end polarity of the first power supply is identical with the polarity of the second end of second source, the control method of the described DC/DC for bidirectional constant comprises the following steps:
Step S1: sampling module gathers inductive current, and gather the electric current of the first mains side or the electric current of second source side;
Step S2: control module is according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit
When electric current is to flow to second source side for timing from the first mains side, described step S2 specifically comprises the following steps:
Steps A 1: control module is according to target current I
2with the current actual current I that sampling module gathers
1calculate Current outer loop input value OuterPIin, OuterPIin=I
2-I
1;
Steps A 2: calculate the proportional P of Current outer loop and the integration item I of Current outer loop according to Current outer loop input value OuterPIin, and calculate Current outer loop output valve OuterPIout, P=OuterPIin*Kp1, I=OuterPIin*Ki1+ △ x, OuterPIout=P+I, wherein △ x is the integration item of last outer shroud, and its initial value is 0;
Steps A 3: control module calculates current inner ring input value InnerPIin, InnerPIin=OuterPIout-IL1 according to the current inductive current IL1 of Current outer loop output valve OuterPIout and sampling module collection;
Steps A 4: calculate the proportional P ' of current inner ring and the integration item I ' of current inner ring according to current inner ring input value InnerPIin, and calculate current inner ring output valve InnerPIout, P '=InnerPIin*Kp2, I '=InnerPIin*Ki2+ △ y, InnerPIout=P '+I ', wherein △ y is the integration item of last inner ring, and its initial value is D1*K;
Steps A 5: the duty ratio controlling the first switch element and second switch unit according to current inner ring output valve InnerPIout, the duty ratio of described first switch element is InnerPIout/K, and the duty ratio of second switch unit is 1-InnerPIout/K;
Wherein, Kp1 is outer shroud proportionality coefficient, and Kp2 is inner ring proportionality coefficient, and Ki1 is outer shroud integral coefficient, and Ki2 is inner ring integral coefficient, and K is occupy ratio, and D1 is the initial duty cycle of the first switch element.
2. the control method of the DC/DC for bidirectional constant according to claim 1, is characterized in that, the initial duty cycle D1 of described first switch element provides the ratio of voltage and the first supplies voltages for second source.
3. the control method of the DC/DC for bidirectional constant according to claim 1 and 2, is characterized in that, the target current I in described steps A 2
2with the current actual current I that sampling module gathers
1there is following corresponding relation:
When needing constant target current I
2when being the electric current of the first mains side, the current actual current I that sampling module gathers
1it is then the current value of the first mains side;
When needing constant target current I
2during electric current for second source side, the current actual current I that sampling module gathers
1it is then the current value of second source side.
4. the control method for the DC/DC of bidirectional constant, it is characterized in that, the described DC/DC for bidirectional constant comprises sampling module, control module and driver module, described driver module comprises the first switch element, second switch unit, first electric capacity, second electric capacity and inductance, the first end of described first switch element is connected with the first end of the first power supply, second end of the first switch element respectively with the first end of inductance, the first end of second switch unit is connected, second end of inductance is connected with the first end of second source, second end of second source respectively with the second end of second switch unit, second end of the first power supply is connected, described first electric capacity is attempted by the two ends of the first power supply, second electric capacity is attempted by the two ends of second source, the voltage that first power supply provides is greater than the voltage that second source provides, and the second end polarity of the first power supply is identical with the polarity of the second end of second source, the control method of the described DC/DC for bidirectional constant comprises the following steps:
Step S1: sampling module gathers inductive current, and gather the electric current of the first mains side or the electric current of second source side;
Step S2: control module is according to target current, the inductive current that sampling module gathers and the electric current of the first mains side or the electric current of second source side, regulate the duty ratio of the first switch element and second switch unit, and realize bidirectional constant by the mode of control first switch element and the complementary conducting of second switch unit
When electric current with from second source effluent to the first mains side for timing, described step S2 specifically comprises the following steps:
Step B1: control module is according to target current I
2with the current actual current I that sampling module gathers
1calculate Current outer loop input value OuterPIin, OuterPIin=I
2-I
1;
Step B2: calculate the proportional P of Current outer loop and the integration item I of Current outer loop according to Current outer loop input value OuterPIin, and calculate Current outer loop output valve OuterPIout, P=OuterPIin*Kp1, I=OuterPIin*Ki1+ △ x, OuterPIout=P+I, wherein △ x is the integration item of last outer shroud, and its initial value is 0;
Step B3: control module calculates current inner ring input value InnerPIin, InnerPIin=OuterPIout-IL1 according to the current inductive current IL1 of Current outer loop output valve OuterPIout and sampling module collection;
Step B4: calculate the proportional P ' of current inner ring and the integration item I ' of current inner ring according to current inner ring input value InnerPIin, and calculate current inner ring output valve InnerPIout, P '=InnerPIin*Kp2, I '=InnerPIin*Ki2+ △ y, InnerPIout=P '+I ', wherein △ y is the integration item of last inner ring, and its initial value is D2*K;
Step B5: the duty ratio controlling the first switch element and second switch unit according to current inner ring output valve InnerPIout, the duty ratio of described first switch element is 1-InnerPIout/K, and the duty ratio of second switch unit is InnerPIout/K;
Wherein, Kp1 is outer shroud proportionality coefficient, and Kp2 is inner ring proportionality coefficient, and Ki1 is outer shroud integral coefficient, and Ki2 is inner ring integral coefficient, and K is occupy ratio, and D2 is the initial duty cycle of second switch unit.
5. the control method of the DC/DC for bidirectional constant according to claim 4, is characterized in that, the target current I in described step B2
2with the current actual current I that sampling module gathers
1there is following corresponding relation:
When needing constant target current I
2when being the electric current of the first mains side, the current actual current I that sampling module gathers
1it is then the current value of the first mains side;
When needing constant target current I
2during electric current for second source side, the current actual current I that sampling module gathers
1it is then the current value of second source side.
6. the control method of the DC/DC for bidirectional constant according to claim 4 or 5, is characterized in that, the difference of the ratio of the voltage that the initial duty cycle D2 of described second switch unit provides for 1 voltage provided with second source and the first power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210121613.1A CN103378727B (en) | 2012-04-24 | 2012-04-24 | A kind of DC/DC for bidirectional constant and control method thereof |
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