CN112532046A - Control method and device for stabilizing voltage and DC/DC conversion system - Google Patents
Control method and device for stabilizing voltage and DC/DC conversion system Download PDFInfo
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- CN112532046A CN112532046A CN202011342011.XA CN202011342011A CN112532046A CN 112532046 A CN112532046 A CN 112532046A CN 202011342011 A CN202011342011 A CN 202011342011A CN 112532046 A CN112532046 A CN 112532046A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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Abstract
The embodiment of the invention provides a control method and device for stabilizing voltage and a DC/DC conversion system, and relates to the technical field of driving. The method comprises the steps of obtaining output voltage, output current, output inductive current, input voltage and input filter voltage, determining current feedforward quantity according to impulse current formed by the output current and the output inductive current, determining voltage feedforward quantity according to impulse voltage formed by the input voltage and the input filter voltage and the input voltage, determining voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity, and finally generating pulse width modulation quantity according to the voltage control quantity to stabilize the output voltage. Because the impact quantity of the output current and the input voltage is taken as the feedforward quantity, the feedforward link can act only when the circuit state changes suddenly, the dynamic characteristic of the system is improved, and the problem that the steady-state characteristic of the system is influenced due to the overlarge feedforward quantity is avoided.
Description
Technical Field
The invention relates to the technical field of DC/DC converters, in particular to a control method and device for stabilizing voltage and a DC/DC conversion system.
Background
In the power takeoff power generation system, the rotating speed of a moving vehicle is changed quickly and in a large range, so that the output voltage amplitude and the voltage frequency of the permanent magnet generator are changed quickly. The AC/DC (Alternating Current/Direct Current) converter causing the power take-off power generation system to be cascaded has the advantages that the change speed of the output Direct Current bus voltage is high, namely the dv/dt value is high, and the range is wide; meanwhile, the electronic load connected to the output end of the DC/DC (Direct Current/Direct Current) converter changes frequently, i.e., the di/dt value is high, and the special load is sensitive to the output dynamic characteristic of the DC/DC converter, i.e., the output voltage regulation rate index becomes poor.
Conventionally, in order to improve the load characteristics and input voltage dynamic characteristics of a system, steady-state values of an input voltage and an output current are used as feedforward amounts. However, the inventor researches and finds that the method has the following problems: an excessively large amount of feedforward value is added to the control loop, which affects the steady-state characteristics of the system and makes it difficult to satisfy both the dynamic characteristics and steady-state characteristics of the system.
Disclosure of Invention
In view of the above, embodiments of the present application provide a method and an apparatus for controlling a regulated voltage, and a DC/DC conversion system, so as to solve the above problems.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present application provides a method for controlling a regulated voltage, which is applied to a DC/DC conversion system, where the method for controlling the regulated voltage includes:
acquiring output voltage, output current, output inductance current, input voltage and input filter voltage;
determining current feed-forward quantity according to an impact current formed by the output current and the output inductive current;
determining a voltage feedforward quantity according to an impulse voltage formed by the input voltage and the input filter voltage and the input voltage;
determining a voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity;
and generating a pulse width modulation amount according to the voltage control amount so as to stabilize the output voltage.
In an alternative embodiment, the step of determining the current feed-forward amount according to the rush current formed by the output current and the output inductor current comprises:
and carrying out integral smoothing operation on the impact current to obtain the current feedforward quantity.
In an alternative embodiment, the step of determining the voltage feedforward quantity according to the impulse voltage formed by the input voltage and the input filter voltage and the input voltage comprises:
performing integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference quantity;
determining a feedback coefficient according to the impulse voltage, the input voltage and a pre-stored coefficient value taking table;
and determining the product of the feedback coefficient and the voltage feedforward reference quantity as the voltage feedforward quantity.
In an optional embodiment, the step of determining the voltage control amount according to the output voltage, the preset target voltage value, the voltage feedforward amount, the output inductor current and the current feedforward amount includes:
determining a current control quantity according to the output voltage, the preset target voltage value and the voltage feedforward quantity;
and determining the voltage control quantity according to the current control quantity, the output inductive current and the current feedforward quantity.
In an optional embodiment, the step of determining the current control amount according to the output voltage, the preset target voltage value and the voltage feedforward amount includes:
calculating the difference between the preset target voltage value and the output voltage amplified by the first preset multiple to obtain a first error voltage;
calculating the difference value of the first error voltage and the voltage feedforward quantity to obtain a second error voltage;
and amplifying the second error voltage by using a voltage controller to obtain the current control quantity.
In an optional embodiment, the step of determining the voltage control amount according to the current control amount, the output inductor current and the current feedforward amount comprises:
calculating the difference value between the current control quantity and the output inductive current amplified by the second preset multiple to obtain a first error current;
calculating the difference value of the first error current and the current feedforward quantity to obtain a second error current;
and amplifying the second error current by using a current controller to obtain the voltage control quantity.
In a second aspect, an embodiment of the present application provides a voltage stabilization control apparatus, which is applied to a DC/DC conversion system, and includes:
the parameter acquisition module is used for acquiring output voltage, output current, output inductive current, input voltage and input filtering voltage;
the current feedforward quantity determining module is used for determining a current feedforward quantity according to an impact current formed by the output current and the output inductive current;
the voltage feedforward quantity determining module is used for determining a voltage feedforward quantity according to an impulse voltage formed by the input voltage and the input filter voltage and the input voltage;
the voltage control quantity determining module is used for determining a voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity;
and the pulse modulation module is used for generating a pulse width modulation quantity according to the voltage control quantity so as to stabilize the output voltage.
In an optional implementation manner, the current feedforward quantity determining module is configured to perform an integral smoothing operation on the inrush current to obtain the current feedforward quantity.
In an optional implementation manner, the voltage feedforward quantity determining module is configured to perform an integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference quantity;
the voltage feedforward quantity determining module is also used for determining a feedback coefficient according to the impulse voltage, the input voltage and a pre-stored coefficient value taking table;
the voltage feedforward quantity determination module is further used for determining the product of the feedback coefficient and the voltage feedforward reference quantity as the voltage feedforward quantity.
In a third aspect, an embodiment of the present application further provides a DC/DC conversion system, where the DC/DC conversion system includes a signal acquisition circuit, a converter power circuit, and a control circuit, and the signal acquisition circuit and the control circuit are electrically connected to the converter power circuit respectively;
the signal acquisition circuit is used for acquiring output voltage, output current, output inductive current, input voltage and input filtering voltage;
the control circuit is configured to obtain the output voltage, the output current, the output inductor current, the input voltage, and the input filter voltage, and control the converter power circuit by using any one of the voltage stabilization control methods 1 to 6 to stabilize the output voltage.
According to the control method and device for stabilizing voltage and the DC/DC conversion system, the output voltage, the output current, the output inductive current, the input voltage and the input filter voltage are obtained, the current feedforward quantity is determined according to the impulse current formed by the output current and the output inductive current, the voltage feedforward quantity is determined according to the impulse voltage formed by the input voltage and the input filter voltage and the input voltage, the voltage control quantity is determined according to the output voltage, the preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity, and finally the pulse width modulation quantity is generated according to the voltage control quantity so as to stabilize the output voltage. Because the impact quantity of the output current and the input voltage is taken as the feedforward quantity, the feedforward link can act only when the circuit state changes suddenly, the dynamic characteristic of the system is improved, and the problem that the steady-state characteristic of the system is influenced due to the overlarge feedforward quantity is avoided.
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 embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a circuit structure of a DC/DC conversion system according to an embodiment of the present application.
FIG. 2 is a circuit diagram of a BUCK converter.
Fig. 3 is a flowchart of a control method for stabilizing voltage according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of determining a current feed forward quantity from an output current and an output inductor current.
FIG. 5 is a schematic diagram of determining a voltage feedforward quantity from an input voltage and an input filter voltage.
Fig. 6 is a detailed flowchart of S303 in fig. 3.
FIG. 7 is a schematic diagram of determining a voltage control amount according to an output voltage, a preset target voltage value, a voltage feedforward amount, an output inductor current, and a current feedforward amount.
Fig. 8 is a detailed flowchart of S304 in fig. 3.
Fig. 9 is a detailed flowchart of S3041 in fig. 8.
Fig. 10 is a detailed flowchart of S3042 in fig. 8.
Fig. 11 shows operation waveforms of the output current, the rush current, and the current feedforward amount.
Fig. 12 shows operation waveforms of the input voltage, the surge voltage, and the voltage feedforward amount.
Fig. 13 is a test waveform in which the load abruptly changes from no load to rated load.
Fig. 14 is a test waveform in which the load abruptly changes from the rated load to no load.
Fig. 15 is a functional block diagram of a voltage stabilizing control apparatus according to an embodiment of the present application.
Icon: 100-DC/DC conversion system; 110-a signal acquisition circuit; 120-converter power circuit; 130-a control circuit; 200-load; 300-a power supply; 400-control means to stabilize the voltage; 410-a parameter acquisition module; 420-a current feed forward amount determination module; 430-a voltage feedforward quantity determination module; 440-a voltage control amount determination module; 450-pulse modulation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The embodiment of the present application provides a DC/DC conversion system 100, which is used for connecting with a load 200 and supplying power to the load 200 to ensure that the load 200 operates smoothly. Referring to fig. 1, the present embodiment provides a block diagram of a circuit structure of a DC/DC conversion system 100. The DC/DC conversion system 100 includes a signal acquisition circuit 110, a converter power circuit 120, and a control circuit 130. The power source 300, the converter power circuit 120 and the load 200 are electrically connected in sequence, the signal acquisition circuit 110 is electrically connected with the converter power circuit, and the control circuit 130 is electrically connected with both the converter power circuit 120 and the signal acquisition circuit 110.
The converter power circuit 120 is configured to convert the power of one voltage value into the power of another voltage value in a dc circuit. The converter power circuit can be, but is not limited to, a Buck, a Boost, a Buck/Boost and other DC/DC converters.
In an alternative embodiment, the converter power circuit 120 may be a BUCK converter as shown in fig. 2.
The signal acquisition circuit 110 is configured to acquire an output voltage, an output current, an output inductor current, an input voltage, and an input filter voltage, and transmit the output voltage, the output current, the output inductor current, the input voltage, and the input filter voltage to the control circuit 130.
It is understood that the signal acquisition circuit 110 includes a current sensor, a voltage divider circuit for acquiring a voltage, and the like.
The control circuit 130 is configured to generate a pulse width modulation amount according to the output voltage, the output current, the output inductor current, the input voltage, and the input filter voltage, so as to stabilize the output voltage of the converter power circuit 120 and ensure that the load 200 can operate stably.
The embodiment of the present application provides a control method for stabilizing voltage, which is applied to the DC/DC conversion system 100. Fig. 3 is a flowchart of a method for controlling a regulated voltage according to an embodiment of the present disclosure. The control method of the stable voltage comprises the following steps:
s301, obtaining output voltage, output current, output inductive current, input voltage and input filtering voltage.
The output voltage is a voltage value output to the load 200, the output current is a current value output to the load 200, the output inductor current is a current value filtered by the output filter inductor L2, the input voltage is a voltage value input from the power supply 300 to the converter power circuit 120, and the input filter voltage is a voltage value filtered by the input filter capacitor and the input filter inductor.
And S302, determining a current feedforward quantity according to an impact current formed by the output current and the output inductance current.
Fig. 4 is a schematic diagram of determining a current feed-forward amount according to an output current and an output inductor current. The difference between the output current and the output inductor current is the impact current. And after the impulse current is obtained through calculation, performing integral smoothing operation on the impulse current to obtain a current feedforward quantity.
Specifically, the current feed-forward amount and the inrush current satisfy the equation:
δi(t)＝ki∫ΔI·dt
wherein, deltai(t) is a current feed forward quantity, kiFor a preset first integral coefficient, Δ I is the inrush current.
It can be understood that after the integral smoothing operation is performed on the impact current, the obtained current feed-forward quantity is a smooth ramp function, and the change is smooth. Therefore, the current feedforward quantity is used as feedback to adjust, and the problem that the steady state of the system is influenced by overlarge feedforward quantity can be avoided.
And S303, determining a voltage feedforward quantity according to the impulse voltage formed by the input voltage and the input filter voltage and the input voltage.
Please refer to fig. 5, which is a schematic diagram of determining a voltage feedforward amount according to an input voltage and an input filter voltage. Therefore, referring to fig. 6, S303 includes:
and S3031, performing integral smoothing operation on the impact voltage to obtain a voltage feedforward reference quantity.
Accordingly, the difference between the input voltage and the input filter voltage is the impulse voltage. And after the impulse voltage is obtained through calculation, performing integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference quantity.
Specifically, the voltage feedforward reference quantity and the impulse voltage satisfy the following formula:
δv(t)＝kv∫ΔVdc·dt
wherein, deltav(t) is a voltage feedforward reference quantity, kvFor a predetermined second integral coefficient, Δ VdcIs the surge voltage.
It can be understood that, after the integral smoothing operation is performed on the impulse voltage, the obtained voltage feedforward reference quantity is also a smooth ramp function, and the change is relatively gentle. Therefore, the voltage feedforward quantity obtained by taking the voltage feedforward reference quantity as the reference is relatively gentle, and the problem that the steady state of the system is influenced by the overlarge feedforward quantity can be avoided.
And S3032, determining a feedback coefficient according to the impulse voltage, the input voltage and a pre-stored coefficient value taking table.
It is to be understood that the pre-stored coefficient value taking table includes the correspondence relationship between the voltage feedforward reference quantity, the input voltage, and the feedback coefficient.
In an alternative embodiment, the pre-stored coefficient value table may be as shown in table 1, where Δ VdcIs surge voltage, VdcIs the input voltage.
For example, when the input voltage is 90V and the surge voltage is 25V, the feedback coefficient may be determined to be 1.06.
It should be noted that, for the voltage values that are not included in the table, an equation that can represent the surge voltage, the input voltage, and the feedback coefficient may be determined first, and then the surge voltage and the input voltage are substituted into the equation to calculate the feedback coefficient.
S3033, determining the product of the feedback coefficient and the voltage feedforward reference quantity as the voltage feedforward quantity.
Thus, the feedback coefficient, the voltage feedforward reference amount, and the voltage feedforward amount satisfy the equation:
δdc＝kvi(Vdc,ΔVdc)·δv(t)
wherein, deltadcAs a voltage feed-forward quantity, kvi(Vdc,ΔVdc) As a feedback coefficient, δvAnd (t) is a voltage feedforward reference quantity.
As can be seen from table 1, when the surge voltage is constant, the feedback coefficient decreases as the input voltage increases. Therefore, the feedback coefficient is determined according to the input voltage and the impulse voltage, the feedback coefficient is enabled to change continuously along with the change of the input voltage, the voltage feedforward quantity is determined according to the feedback coefficient, the sudden change of the voltage feedforward quantity can be relieved, and the dynamic stability in the process of the quick change of the input voltage is improved.
And S304, determining a voltage control quantity according to the output voltage, the preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity.
Referring to fig. 7, a schematic diagram of determining a voltage control amount according to an output voltage, a preset target voltage value, a voltage feedforward amount, an output inductor current, and a current feedforward amount is shown. Referring to fig. 8, S304 includes:
s3041, determining a current control amount according to the output voltage, the preset target voltage value and the voltage feedforward amount.
Referring to fig. 9, S3041 includes:
s30411, calculating a difference between the preset target voltage value and the amplified output voltage by the first preset multiple to obtain a first error voltage.
That is, the first error voltage, the target voltage value and the output voltage satisfy the following equation:
wherein the content of the first and second substances,
is a first error voltage, VrFor a preset target voltage value, V0To output a voltage, K1Is a first preset multiple.
It can be understood that the preset target voltage value and the first preset multiple are preset, and the preset target voltage value and the first preset multiple may be set according to actual requirements.
S30412, calculating a difference between the first error voltage and the voltage feedforward amount to obtain a second error voltage.
That is, the first error voltage, the voltage feedforward amount and the second error voltage satisfy the following equation:
wherein the content of the first and second substances,
is the second error voltage, δdcAs the amount of voltage feed-forward,
is a first error voltage.
S30413, amplifying the second error voltage by the voltage controller to obtain a current control amount.
In an alternative embodiment, the voltage controller may be a PI (Proportional/Integral) regulator. The current control quantity is the control quantity output by the voltage controller.
S3042, determining a voltage control amount according to the current control amount, the output inductor current, and the current feedforward amount.
Referring to fig. 10, S3042 includes:
s30421, calculating a difference between the current controlled variable and the amplified second predetermined multiple of the output inductor current to obtain a first error current.
That is, the current control amount, the output inductor current, and the first error current may satisfy the following equation:
wherein the content of the first and second substances,
is a first error current which is a first error current,
as a current control quantity, iL(t) is the output inductor current, K2Is a second preset multiple.
It can be understood that the second preset multiple is a preset coefficient, and can be set according to the actual application requirement.
S30422, calculating a difference between the first error current and the current feed-forward amount to obtain a second error current.
That is, the first error current, the current feedforward amount, and the second error current satisfy the equation:
wherein the content of the first and second substances,
is the second error current, and is,
is the first error current, δiAnd (t) is a current feed-forward quantity.
S30423, amplifying the second error current by the current controller to obtain a voltage control amount.
It should be noted that the current controller may be a PI regulator or a P regulator. And the voltage control quantity is the output quantity of the current controller.
S305, a pulse width modulation amount is generated according to the voltage control amount to stabilize the output voltage.
Next, the principle and effect of the present application will be described by taking the converter power circuit 120 as a BUCK converter as shown in fig. 2 as an example.
First, according to the schematic diagram shown in fig. 4, a current feed-forward amount is determined based on a rush current formed by the output current and the output inductor current. The operation waveforms of the output current, the inrush current, and the current feed-forward amount may be as shown in fig. 11.
It can be seen that at t0Before the moment comes, the circuit works stably, the impact current delta I is the ripple current of the output inductor L2, and the amplitude of the ripple current is lower after the integral smoothing operation; at t0At the moment, the load 200 suddenly increases, resulting in a sudden change in the rush current Δ I, at t1At time, the inductor current i is outputL(t) entering a steady state, the impulse current DeltaI has a pulse width Deltat1＝t1-t0(in general,. DELTA.t)1Approximately equal to 3 Ts-5 Ts, Ts is the working period of the converter power circuit 120), and the pulse width of the output current feedforward quantity is delta t after the integral smoothing operation2＝t1-t0≈2Δt1Therefore, the process of stabilizing the output voltage according to the current feed-forward quantity is more gradual, and the problem of unstable operation of the load 200 caused by sudden change of the load 200 is avoided.
Next, according to the schematic diagram shown in fig. 5, a voltage feedforward amount is determined from the input voltage and the surge voltage formed by the input voltage and the input filter voltage. The operation waveforms of the input voltage, the surge voltage and the voltage feedforward amount can be as shown in fig. 12.
It can be seen that at t0Before the moment comes, the circuit works stably, and the impulse voltage delta VdcThe ripple voltage is obtained, and the amplitude of the ripple voltage is lower after the integral smoothing operation; at t0Time of day, input voltage VdcSurge, resulting in a surge voltage Δ VdcSudden change, surge voltage Δ VdcHas a pulse width of Δ t1＝3To～5To，(
LinFor input filteringWave inductance, CinAs an input filter capacitor), the pulse width of the output voltage feedforward quantity is delta t after integral smoothing operation2＝t1-t0≈2Δt1Therefore, the process of stabilizing the output voltage according to the voltage feedforward quantity is more gradual, and the problem of unstable operation of the load 200 caused by sudden change of the input voltage is avoided.
Meanwhile, in order to further explain the working principle and effect of the present invention, the circuit shown in fig. 2 is verified experimentally, and experimental parameters are as follows:
input voltage: direct current 35V-145V; input filter inductance Lin: 2 muH; input filter capacitance Cin: 2000 muF; output filter inductance Lout: 7.2 muH; an output filter capacitor C: 35000 μ F; output power: 10 kW; output voltage: 28V.
Referring to fig. 13, a test waveform of the load 200 suddenly changing from no load to the rated load 200; please refer to fig. 14, which shows a test waveform in which the load 200 suddenly changes from the rated load 200 to no-load (where the resistance R of the load 200 is 0.0784).
It can be seen that when the load 200 is switched from the rated load 200 to no load, the maximum adjustment voltage is 0.63V, and the adjustment rate is 2.25% at most; when the load 200 is switched from no load to the rated load 200, the maximum regulation voltage is 0.76V, and the regulation rate is 2.71% at most. That is, the control method for stabilizing voltage provided by the present application can not only improve the dynamic characteristics of the system, but also reduce the adjustment rate of the load 200 and the input voltage, and can meet the high technical index requirement of the high-end mobile power supply 300.
In order to perform the corresponding steps in the above embodiments and various possible modes, an implementation mode of the voltage stabilization control device 400 is given below. Referring to fig. 15, fig. 15 is a functional block diagram of a voltage stabilizing control apparatus 400 according to an embodiment of the present disclosure. It should be noted that the basic principle and the generated technical effect of the control device 400 for stabilizing voltage provided by the present embodiment are the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and corresponding contents in the above embodiments may be referred to. The voltage stabilization control apparatus 400 includes: the control circuit comprises a parameter acquisition module 410, a current feedforward amount determination module 420, a voltage feedforward amount determination module 430, a voltage control amount determination module 440 and a pulse modulation module 450.
The parameter obtaining module 410 is configured to obtain an output voltage, an output current, an output inductor current, an input voltage, and an input filter voltage.
It is understood that in an alternative embodiment, the parameter obtaining module 410 may be configured to execute S301.
The current feedforward amount determining module 420 is configured to determine a current feedforward amount according to an inrush current formed by the output current and the output inductor current.
It is to be appreciated that in an alternative embodiment, the current feedforward amount determining module 420 may be configured to perform S302.
The voltage feedforward quantity determining module 430 is configured to determine a voltage feedforward quantity according to an impulse voltage formed by the input voltage and the input filter voltage and the input voltage.
Specifically, the voltage feedforward amount determining module 430 is configured to perform an integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference amount, determine a feedback coefficient according to the impulse voltage, the input voltage, and a pre-stored coefficient value taking table, and determine a product of the feedback coefficient and the voltage feedforward reference amount as the voltage feedforward amount.
It is understood that in an alternative embodiment, the voltage feedforward amount determining module 430 may be used to perform S303, S3031, S3032 and S3033.
The voltage control amount determining module 440 is configured to determine a voltage control amount according to the output voltage, a preset target voltage value, a voltage feedforward amount, an output inductor current, and a current feedforward amount.
Specifically, the voltage control amount determining module 440 is configured to determine a current control amount according to the output voltage, a preset target voltage value, and a voltage feedforward amount, and determine a voltage control amount according to the current control amount, the output inductor current, and the current feedforward amount.
The voltage control quantity determining module 440 is further configured to calculate a difference between a preset target voltage value and the output voltage amplified by the first preset multiple to obtain a first error voltage, calculate a difference between the first error voltage and the voltage feedforward quantity to obtain a second error voltage, and amplify the second error voltage by using the voltage controller to obtain the current control quantity.
The voltage control quantity determining module 440 is further configured to calculate a difference between the current control quantity and the amplified second preset multiple output inductor current to obtain a first error current, calculate a difference between the first error current and the current feedforward quantity to obtain a second error current, and amplify the second error current by using the current controller to obtain the voltage control quantity.
It is understood that, in an alternative embodiment, the voltage control amount determining module 440 may be configured to perform S304, S3041, S3042, S30411, S30412, S30413, S30421, S30422 and S30423.
The pulse modulation module 450 is used for generating a pulse width modulation amount according to the voltage control amount to stabilize the output voltage.
It is to be appreciated that in an alternative embodiment, the pulse modulation module 450 may be configured to perform S305.
In summary, embodiments of the present invention provide a method and an apparatus for controlling a regulated voltage, and a DC/DC conversion system, in which an output voltage, an output current, an output inductor current, an input voltage, and an input filter voltage are obtained, a current feedforward amount is determined according to an impulse current formed by the output current and the output inductor current, a voltage feedforward amount is determined according to an impulse voltage formed by the input voltage and the input filter voltage, a voltage control amount is determined according to the output voltage, a preset target voltage value, the voltage feedforward amount, the output inductor current, and the current feedforward amount, and finally a pulse width modulation amount is generated according to the voltage control amount to stabilize the output voltage. Because the impact quantity of the output current and the input voltage is taken as the feedforward quantity, the feedforward link can act only when the circuit state changes suddenly, the dynamic characteristic of the system is improved, and the problem that the steady-state characteristic of the system is influenced due to the overlarge feedforward quantity is avoided.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A control method for stabilizing voltage is applied to a DC/DC conversion system, and comprises the following steps:
acquiring output voltage, output current, output inductance current, input voltage and input filter voltage;
determining current feed-forward quantity according to an impact current formed by the output current and the output inductive current;
determining a voltage feedforward quantity according to an impulse voltage formed by the input voltage and the input filter voltage and the input voltage;
determining a voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity;
and generating a pulse width modulation amount according to the voltage control amount so as to stabilize the output voltage.
2. The method of claim 1, wherein the step of determining a current feed forward amount according to a rush current formed by the output current and the output inductor current comprises:
and carrying out integral smoothing operation on the impact current to obtain the current feedforward quantity.
3. The method of claim 1, wherein the step of determining a voltage feedforward amount according to a surge voltage formed by the input voltage and the input filter voltage and the input voltage comprises:
performing integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference quantity;
determining a feedback coefficient according to the impulse voltage, the input voltage and a pre-stored coefficient value taking table;
and determining the product of the feedback coefficient and the voltage feedforward reference quantity as the voltage feedforward quantity.
4. The method according to any one of claims 1 to 3, wherein the step of determining a voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductor current and the current feedforward quantity comprises:
determining a current control quantity according to the output voltage, the preset target voltage value and the voltage feedforward quantity;
and determining the voltage control quantity according to the current control quantity, the output inductive current and the current feedforward quantity.
5. The method according to claim 4, wherein the step of determining the current control amount according to the output voltage, the preset target voltage value and the voltage feedforward amount comprises:
calculating the difference between the preset target voltage value and the output voltage amplified by the first preset multiple to obtain a first error voltage;
calculating the difference value of the first error voltage and the voltage feedforward quantity to obtain a second error voltage;
and amplifying the second error voltage by using a voltage controller to obtain the current control quantity.
6. The method of claim 4, wherein the step of determining the voltage control quantity according to the current control quantity, the output inductor current and the current feedforward quantity comprises:
calculating the difference value between the current control quantity and the output inductive current amplified by the second preset multiple to obtain a first error current;
calculating the difference value of the first error current and the current feedforward quantity to obtain a second error current;
and amplifying the second error current by using a current controller to obtain the voltage control quantity.
7. A voltage stabilization control apparatus applied to a DC/DC conversion system, comprising:
the parameter acquisition module is used for acquiring output voltage, output current, output inductive current, input voltage and input filtering voltage;
the current feedforward quantity determining module is used for determining a current feedforward quantity according to an impact current formed by the output current and the output inductive current;
the voltage feedforward quantity determining module is used for determining a voltage feedforward quantity according to an impulse voltage formed by the input voltage and the input filter voltage and the input voltage;
the voltage control quantity determining module is used for determining a voltage control quantity according to the output voltage, a preset target voltage value, the voltage feedforward quantity, the output inductive current and the current feedforward quantity;
and the pulse modulation module is used for generating a pulse width modulation quantity according to the voltage control quantity so as to stabilize the output voltage.
8. The voltage stabilization control device according to claim 7, wherein the current feedforward amount determination module is configured to perform an integral smoothing operation on the inrush current to obtain the current feedforward amount.
9. The voltage stabilization control device according to claim 7, wherein the voltage feedforward quantity determination module is configured to perform an integral smoothing operation on the impulse voltage to obtain a voltage feedforward reference quantity;
the voltage feedforward quantity determining module is also used for determining a feedback coefficient according to the impulse voltage, the input voltage and a pre-stored coefficient value taking table;
the voltage feedforward quantity determination module is further used for determining the product of the feedback coefficient and the voltage feedforward reference quantity as the voltage feedforward quantity.
10. The DC/DC conversion system is characterized by comprising a signal acquisition circuit, a converter power circuit and a control circuit, wherein the signal acquisition circuit and the control circuit are respectively and electrically connected with the converter power circuit;
the signal acquisition circuit is used for acquiring output voltage, output current, output inductive current, input voltage and input filtering voltage;
the control circuit is configured to obtain the output voltage, the output current, the output inductor current, the input voltage, and the input filter voltage, and control the converter power circuit by using any one of the voltage stabilization control methods 1 to 6 to stabilize the output voltage.
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