CN106385170B - Control method and device for high-voltage input - Google Patents
Control method and device for high-voltage input Download PDFInfo
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- CN106385170B CN106385170B CN201510448099.6A CN201510448099A CN106385170B CN 106385170 B CN106385170 B CN 106385170B CN 201510448099 A CN201510448099 A CN 201510448099A CN 106385170 B CN106385170 B CN 106385170B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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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 provides a control method and a control device for high-voltage input. Wherein, the method comprises the following steps: acquiring the maximum value of the instantaneous value of the input voltage of the current circuit; judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value or not; extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; the operating state of the input current oscillation in the circuit is adjusted in accordance with a control strategy. The invention solves the problem that the heavy-load work cannot be reliably and stably carried out by high-voltage input due to lack of control over PFC in the related technology, thereby achieving the effect of stabilizing the heavy-load work by the high-voltage input.
Description
Technical Field
The invention relates to the field of communication, in particular to a control method and device for high-voltage input.
Background
In a traditional Boost Power Factor Correction (PFC for short), a topology structure of the Boost is not efficient because reverse recovery loss exists in a PFC freewheeling diode. In order to improve the efficiency, the diode is replaced by a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and the topological structure is a totem-pole PFC. The totem-pole PFC topology is currently widely used in switching power supplies due to its high conversion efficiency. A typical single-phase totem-pole Boost PFC topology is shown in fig. 1.
In fig. 1, L is an input inductor, VT1 and VT2 are power MOSFET transistors, each MOSFET transistor includes an individual diode and a parasitic capacitor, D1 and D2 are return diodes used in the power frequency half-cycle loop, and C is a Bus capacitor. In order to improve the efficiency, the totem-pole PFC generally operates in a critical current mode (BCM), and in the operating mode, zero-voltage switching-on (ZVS) of a driving tube and zero-current switching-off (ZCS) of a follow current tube are relatively easy to realize through a certain control strategy, so that the efficiency is improved. In the BCM mode of operation, when the instantaneous values of the input voltage and Bus voltage are relatively close, the circuit will be unstable for the following reasons:
taking the positive half cycle of the input voltage as an example, when the driving transistor VT2 is turned on, the inductive current rises and the slope is
When the driving tube VT2 is turned off, VT1 continues current, the inductive current decreases, and the slope is
In the BCM mode, the drive of the next switching cycle is initiated only after the inductor current has dropped to 0. As can be seen from the above formula, when the high voltage is input, the input voltage v is presentinHigher, near vbusI.e. vbusAnd vinThe difference of (a) is small, the inductor current falling slope is close to 0, i.e., the inductor current hardly falls to 0. The driving is difficult to emit, so that the input current oscillates near the peak value of the input voltage, and in severe cases, the PFC converter works in a Continuous Current Mode (CCM) near the peak value of the input voltage, and the inductor current overshoots; in addition, phase-locked abnormity can be caused due to input current oscillation under the condition of two-phase interleaved parallel connection, and input current oscillation near the peak value of input voltage is further aggravated, so that the PFC converter cannot reliably and stably carry out heavy-load work when high voltage is input.
Aiming at the problem that the high-voltage input cannot be reliably and stably carried out with heavy-load work due to the lack of control over PFC in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a control method and a control device for high-voltage input, which at least solve the problem that the high-voltage input cannot reliably and stably carry heavy-load work due to lack of control over PFC in the related art.
According to an aspect of the present invention, there is provided a control method of a high voltage input, including: acquiring the maximum value of the instantaneous value of the input voltage of the current circuit; judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value or not; extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; the operating state of the input current oscillation in the circuit is adjusted in accordance with a control strategy.
Optionally, the determining whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold includes: when the maximum value of the instantaneous value of the input voltage is larger than a preset threshold value, the circuit is judged to be in an operation state of input current oscillation.
Optionally, the control strategy at least includes: under the conditions of a high-voltage boost Bus voltage reference strategy, an inductive current square wave strategy, a driving limit value conduction strategy or a high-voltage switch driving strategy, the step of extracting a control strategy corresponding to a preset threshold value comprises the following steps: when the maximum value of the instantaneous value of the input voltage is larger than a first preset threshold value, extracting a high-voltage boost Bus voltage reference strategy corresponding to the first preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a second preset threshold value, extracting an inductive current square wave strategy corresponding to the second preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a third preset threshold value, extracting a driving limit value conduction strategy corresponding to the third preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a fourth preset threshold value, extracting a high-voltage switch driving strategy corresponding to the fourth preset threshold value; wherein, the preset threshold value comprises: the input current oscillation circuit comprises a first preset threshold, a second preset threshold, a third preset threshold and a fourth preset threshold, wherein the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are maximum values of input voltage when the input current starts to oscillate.
Optionally, the step of adjusting the operating state of the input current oscillation in the circuit according to the control strategy comprises: when the control strategy is a high-voltage boost Bus voltage reference strategy, summing the maximum value of the instantaneous value of the input voltage and a preset fixed voltage to obtain a Bus voltage reference; when the control strategy is an inductive current square wave strategy, switching the power factor correction PFC inductive current from a sine wave controlled by constant conduction time to a square wave controlled by constant current peak value, and controlling the output power to be equal when the sine wave controlled by the constant conduction time is switched to the square wave controlled by the constant current peak value; when the control strategy is a driving limit value conduction strategy, in a preset period, in a symmetrical area taking the peak value of the input voltage as the center, controlling the PFC driving to reduce along with the increase of the instantaneous value of the input voltage; and when the control strategy is a high-voltage-off drive strategy, the PFC drive is turned off in a symmetrical region with the input voltage peak value as the center.
Optionally, after summing the maximum value of the instantaneous value of the input voltage with a preset fixed voltage to obtain a Bus voltage reference, the method further includes: and adjusting the Bus voltage reference standard to be less than or equal to the rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor, wherein the rated voltage upper limit is the effective value of the working voltage of the Bus capacitor.
According to another aspect of the present invention, there is provided a control apparatus of a high voltage input, including: the acquisition module is used for acquiring the maximum value of the input voltage instantaneous value of the current circuit; the judging module is used for judging whether the maximum value of the input voltage instantaneous value acquired by the acquiring module is larger than a preset threshold value or not; the extraction module is used for extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; and the control module is used for adjusting the running state of the input current oscillation in the circuit according to the control strategy extracted by the extraction module.
Optionally, the determining module includes: and the judging unit is used for judging that the circuit is in the operation state of input current oscillation when the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value.
Optionally, the control strategy at least includes: under the condition of a high-voltage boost Bus voltage reference strategy, an inductive current square wave strategy, a driving limit value conduction strategy or a high-voltage switch driving strategy, the extraction module comprises: the device comprises a first extraction unit, a second extraction unit and a control unit, wherein the first extraction unit is used for extracting a high-voltage boost Bus voltage reference strategy corresponding to a first preset threshold value when the maximum value of the instantaneous value of the input voltage is larger than the first preset threshold value; the second extraction unit is used for extracting an inductive current square wave strategy corresponding to a second preset threshold value when the maximum value of the instantaneous value of the input voltage is larger than the second preset threshold value; the third extraction unit is used for extracting a driving limit value conduction strategy corresponding to a third preset threshold value when the maximum value of the instantaneous value of the input voltage is larger than the third preset threshold value; the fourth extraction unit is used for extracting a high-voltage switch driving strategy corresponding to a fourth preset threshold value when the maximum value of the instantaneous value of the input voltage is greater than the fourth preset threshold value; wherein, the preset threshold value comprises: the input current oscillation circuit comprises a first preset threshold, a second preset threshold, a third preset threshold and a fourth preset threshold, wherein the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are maximum values of input voltage when the input current starts to oscillate.
Optionally, the control module includes: the first control unit is used for summing the maximum value of the instantaneous value of the input voltage and a preset fixed voltage to obtain a Bus voltage reference standard when the control strategy is a high-voltage boost Bus voltage reference standard strategy; the second control unit is used for switching the sine wave shape controlled by the constant conduction time of the PFC inductive current into the square wave shape controlled by the constant current peak value when the control strategy is an inductive current square wave strategy, and controlling the output power when the sine wave shape controlled by the constant conduction time is switched into the square wave shape controlled by the constant current peak value to be equal; a third control unit, configured to control the PFC drive to decrease with an increase of an instantaneous value of the input voltage in a symmetrical region centered on a peak value of the input voltage in a preset period when the control strategy is the driving limit on strategy; and the fourth control unit is used for turning off the PFC drive in a symmetrical area taking the peak value of the input voltage as the center when the control strategy is a high-voltage-off drive strategy.
Optionally, the first control unit includes: and the first control subunit is used for adjusting the Bus voltage reference standard to be smaller than or equal to the rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor after summing the maximum value of the instantaneous value of the input voltage and the preset fixed voltage to obtain the Bus voltage reference standard, wherein the rated voltage upper limit is the effective value of the working voltage of the Bus capacitor.
According to the invention, the maximum value of the instantaneous value of the input voltage of the current circuit is obtained; judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value or not; extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; the operating state of the input current oscillation in the circuit is adjusted in accordance with a control strategy. The problem of in the correlation technique because lack the control to PFC, lead to high-voltage input reliably stable area heavy load work is solved, and then reached the effect of high-voltage input stable area heavy load work.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a diagram of a single-phase totem-pole Boost PFC topology in the related art;
FIG. 2 is a flow chart of a method of controlling a high voltage input according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a waveform conversion of an inductor current square wave strategy provided in accordance with an embodiment of the present invention;
FIG. 4 is a graph illustrating an example of a linear reduction in a drive limit turn-on strategy provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a high-pressure off-drive strategy calculation starting off-drive time provided in accordance with an embodiment of the present invention;
fig. 6 is a block diagram of a control apparatus for high voltage input according to an embodiment of the present invention;
fig. 7 is a block diagram of another high voltage input control apparatus according to an embodiment of the present invention;
fig. 8 is a block diagram of a control apparatus for high voltage input according to an embodiment of the present invention;
fig. 9 is a block diagram showing a structure of still another control apparatus for high voltage input according to an embodiment of the present invention; and the number of the first and second groups,
fig. 10 is a block diagram of a control apparatus for high voltage input according to another embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In the present embodiment, a control method of high voltage input is provided, and fig. 2 is a flowchart of the control method of high voltage input according to the embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
step S202, obtaining the maximum value of the input voltage instantaneous value of the current circuit;
step S204, judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value;
step S206, extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value;
step S208, the operation state of the input current oscillation in the circuit is adjusted according to the control strategy.
With reference to steps S202 to S208, the control method for high voltage input according to the embodiment of the present invention is suitable for totem pole Power Factor Correction (PFC), in particular, a control method for high voltage input of a converter operating in a critical Current Mode (BCM). In the embodiment of the invention, firstly, the maximum value of the input voltage instantaneous value of the current circuit is obtained, secondly, the maximum value of the input voltage instantaneous value is compared with the preset threshold value, further, the control strategy of the preset threshold value is extracted under the condition that the maximum value of the input voltage instantaneous value is larger than the preset threshold value, and finally, the operation state of the input current oscillation in the circuit is adjusted according to the control strategy.
Here, since in the related art, in the BCM operation mode, the driving of the next switching cycle is performed after the inductor current is decreased to 0. When high pressure is input, the pressure is inputInput voltage vinHigher, close to Bus voltage vbusI.e. vbusAnd vinThe difference of (a) is small, the inductor current falling slope is close to 0, i.e., the inductor current hardly falls to 0. The driving is difficult to emit, so that the input current oscillates near the peak value of the input voltage, and in severe cases, the PFC converter works in a Continuous Current Mode (CCM) near the peak value of the input voltage, and the inductor current overshoots; in addition, phase-locked abnormity can be caused due to input current oscillation under the condition of two-phase interleaved parallel connection, and input current oscillation near the peak value of input voltage is further aggravated, so that the PFC converter cannot reliably and stably carry out heavy-load work when high voltage is input. Therefore, the control method of the high-voltage input provided by the steps S202 to S208 solves the problem that the PFC cannot stabilize the heavy-load operation due to the input current oscillation during the high-voltage input, and improves the reliability of the PFC.
Through the steps, the maximum value of the instantaneous value of the input voltage of the current circuit is obtained; judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value or not; extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; the operating state of the input current oscillation in the circuit is adjusted in accordance with a control strategy. The problem of in the correlation technique because lack the control to PFC, lead to high-voltage input reliably stable area heavy load work is solved, and then reached the effect of high-voltage input stable area heavy load work.
Optionally, the step S204 of determining whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold includes:
when the maximum value of the instantaneous value of the input voltage is larger than a preset threshold value, the circuit is judged to be in an operation state of input current oscillation.
Optionally, the control strategy at least includes: under the conditions of the high-voltage boost Bus voltage reference strategy, the inductive current square wave strategy, the driving limit value conduction strategy or the high-voltage shutdown driving strategy, the step of extracting the control strategy corresponding to the preset threshold value in the step S206 includes:
the method comprises the steps that firstly, when the maximum value of an input voltage instantaneous value is larger than a first preset threshold value, a high-voltage boost Bus voltage reference strategy corresponding to the first preset threshold value is extracted;
assuming that the first preset threshold is V1, when the maximum value of the instantaneous value of the input voltage is greater than V1, entering a high-voltage boost Bus voltage reference strategy, that is, adding a fixed voltage to the maximum value of the instantaneous value of the input voltage as a Bus voltage reference, and limiting the amplitude of the Bus voltage reference.
When the maximum value of the instantaneous value of the input voltage is larger than a second preset threshold value, extracting an inductive current square wave strategy corresponding to the second preset threshold value;
assuming that the second preset threshold is V2, when the maximum value of the instantaneous value of the input voltage is greater than V2, the inductor current square-wave strategy is entered, that is, the PFC inductor current is switched from a sine wave controlled by the constant on-time to a square wave controlled by the constant current peak value, and the power delivered by the two at the switching time is equal.
When the maximum value of the instantaneous value of the input voltage is larger than a third preset threshold value, extracting a driving limit value conduction strategy corresponding to the third preset threshold value;
and assuming that the third preset threshold is V3, when the maximum value of the instantaneous value of the input voltage is greater than V3, entering a driving limit value conduction strategy, that is, in each half power frequency cycle, in a symmetric region centered on the peak value of the input voltage, the PFC drive calculated by the PFC control loop decreases with the increase of the instantaneous value of the input voltage.
When the maximum value of the instantaneous value of the input voltage is larger than a fourth preset threshold value, extracting a high-voltage switch driving strategy corresponding to the fourth preset threshold value;
and assuming that the fourth preset threshold is V4, when the maximum value of the instantaneous value of the input voltage is greater than V4, entering a high-voltage-off driving strategy, namely, turning off the PFC driving in a symmetrical region with the input voltage peak as the center.
Here, the preset threshold includes: the input current oscillation control circuit comprises a first preset threshold, a second preset threshold, a third preset threshold and a fourth preset threshold, wherein the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are maximum input voltage values when the input current starts to oscillate, namely, V1, V2, V3 and V4 are maximum input voltage values when the input current starts to oscillate.
Optionally, the step of adjusting the operation state of the input current oscillation in the circuit according to the control strategy in step S208 includes:
the method comprises the steps that when a control strategy is a high-voltage boost Bus voltage reference strategy, the maximum value of an input voltage instantaneous value is summed with a preset fixed voltage to obtain a Bus voltage reference;
and when the maximum value of the detected instantaneous value of the input voltage is greater than V1, entering a high-voltage boost Bus voltage reference strategy. The concrete implementation is as follows: the maximum value of the instantaneous value of the input voltage plus a fixed voltage is taken as a Bus voltage reference,
optionally, after the maximum value of the instantaneous value of the input voltage is summed with a preset fixed voltage to obtain a Bus voltage reference, the Bus voltage reference is adjusted to be smaller than or equal to a rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor, where the rated voltage upper limit is an effective value of the working voltage of the Bus capacitor, that is, since the Bus capacitor has limited withstand voltage, it cannot be increased without limit, and the upper limit of the Bus voltage needs to be limited. In order not to damage the Bus capacitor, the clipping value is generally an effective value for the Bus capacitor to work normally.
In a second mode, when the control strategy is an inductive current square wave strategy, the power factor correction PFC inductive current is switched from a sine wave controlled by constant conduction time to a square wave controlled by constant current peak value, and the output power is equal when the sine wave controlled by constant conduction time is switched to the square wave controlled by constant current peak value;
when the maximum value of the detected instantaneous value of the input voltage continues to increase to V2, an inductive current square wave strategy is entered, that is, the inductive current is switched from a sine wave controlled by the constant on-time to a square wave controlled by the constant current peak value, and the power transmitted by the two at the switching time is ensured to be equal.
When the voltage is normally input, the PFC function needs to be realized, so a control method of constant conduction time needs to be used; when high voltage is input, stable operation needs to be realized, and a method of constant current peak value is used. In order to ensure the stable switching of the two loops, the following method is adopted:
the voltage loop output of the PFC is regarded as the average value of the inductive current, the driving conduction time required by the power frequency period is obtained through conversion, if the stable switching of the loop is controlled by the constant conduction time and the constant current peak value, the relation between the two needs to be determined, and the power transmitted by the two at the switching moment is ensured to be equal.
Specifically, as shown in fig. 3, fig. 3 is a schematic diagram of waveform conversion of the inductor current square wave strategy provided according to the embodiment of the present invention, wherein I in fig. 3avgIs the voltage loop output of PFC, i.e. the average value of the peak envelope of the inductor current, Iavg_tInstantaneous value of the mean value of the inductor current, Iavg_sqrThe average value of the inductance current under the control of the constant current peak value.
Let the input voltage angular frequency be ω. The fundamental wave obtained by the square wave through Fourier series decomposition is as follows:
obtaining instantaneous value I of the average value of the inductive current according to the relation between the average value and the maximum value of the sine waveavg_tAverage value I of peak envelope of inductor currentavgThe relation of (A) is as follows:
to achieve smooth handover, I needs to be as abovebaseAnd Iavg_tThe energy delivered by both is equal, so that:
Ibase＝Iavg_t
the following can be derived from the above formula:
in any switching period under the control of a constant current peak value, a volt-second balance formula of an inductor is adopted:
L×iLP＝vin×Ton
wherein iLPThe peak inductor current value.
The PFC driving time can be obtained by the following two formulas:
the above equation is the equation for smoothly converting the PFC inductor current from a sine wave to a square wave.
When the control strategy is a driving limit value conduction strategy, in a preset period, in a symmetrical area taking the peak value of the input voltage as the center, controlling the PFC drive to reduce along with the increase of the instantaneous value of the input voltage;
when the maximum value of the detected input voltage instantaneous value is continuously increased to V3, the voltage difference between the Bus voltage instantaneous value and the maximum value of the input voltage instantaneous value is further reduced, the problems of input current oscillation and inductive current overshoot still occur only by adopting a Bus voltage reference boosting and inductive current square wave strategy, and in order to reduce the inductive current overshoot, the driving conduction time T needs to be moderately reduced near the input voltage peak valueonI.e. the drive limit on strategy is enabled. The design idea of the drive limit turn-on strategy is that in each half power frequency period, in a symmetric region with the input voltage peak value as the center, the PFC drive calculated by the control loop decreases with the increase of the input voltage instantaneous value. There are many ways of reduction, and a linear reduction example is given here. Multiplying the PFC drive calculated by the control loop by a limit value conduction coefficient k to obtain the final PFC drive Ton。
k as a function of input voltage instantaneous value vinThe absolute value of (a) varies linearly, and the formula is:
k＝a|vin|+b
through (v)th1，1)、(vth20) two points, the values of constants a and b can be solved. v. ofth1For input current to start outThe maximum value of the input voltage at the time of the present oscillation; v. ofth2The value range is relatively wide, but v needs to be ensuredth2＞vth1，vth2The larger the PFC drive, the slower the PFC drive reduction speed, generally taking vth2The maximum value of the instantaneous value of the maximum input voltage can be borne by the PFC converter in normal operation, so that the PFC drive can not be turned off when a limit value conduction strategy is adopted.
When | vin|＜vth1When k is 1, the PFC drive is unchanged; when | vin|＞vth1And | vin|＜vth2When k is between 0 and 1, the PFC drive linearity is reduced; when | vin|＞vth2When k is 0, the PFC drive is turned off; specifically, as shown in fig. 4, fig. 4 is a graph illustrating an example of linear reduction of the driving limit value conduction strategy according to the embodiment of the present invention.
And fourthly, when the control strategy is a high-voltage-off driving strategy, the PFC driving is turned off in a symmetrical region with the input voltage peak value as the center.
When the maximum value of the detected input voltage instantaneous value is continuously increased to V4, the voltage difference between the Bus voltage instantaneous value and the input voltage instantaneous value is close to 0 or a negative number, the input current oscillation is intensified, after a Bus voltage reference boosting strategy, an inductive current square wave strategy and a driving limit value conduction strategy are adopted, the input current still oscillates, and at the moment, a high-voltage-off driving strategy is started, namely, PFC driving is stopped in a symmetrical area taking the input voltage peak value as the center. There are many conditions for turning off the PFC drive, and a specific example is given here. When the input voltage transient is greater than the off-drive threshold vthAnd when the PFC drive is started, the PFC drive is closed. Off drive threshold vthThe size of (A) cannot be selected at will, and the design must be accounted according to the parameters of the PFC converter.
Suppose V1To turn off the Bus voltage before driving, V2When the Bus voltage after the driving is closed, C is the capacitance value of the Bus capacitor, p is the power of the PFC converter, η is the conversion efficiency of the PFC converter, and T1 is the duration time of the closing driving, the following relational expression is satisfied during the closing driving according to the law of energy conservation
In order to ensure that the Bus voltage does not oscillate when the drive is turned off, the Bus voltage caused by the drive is ensured to fall within the range of Bus voltage ripple, namely V is ensured1-V2Is less than the Bus voltage ripple peak-to-peak value, from which the off drive duration T1 can be determined from the above equation.
For a standard sinusoid with period T, let the time of the corresponding initial off drive be T0 when the off drive duration is T1.
As shown in fig. 5, fig. 5 is a schematic diagram of calculating the initial off-drive time of the high-voltage off-drive strategy according to the embodiment of the present invention, and the geometric relationship of fig. 5 can be obtained as follows:
thus initiating the off drive phase angle:
the effective value of the input voltage can be determined to be V according to the formularmsAnd an off-drive threshold v corresponding to an off-drive duration of T1th：
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a control device for high voltage input is also provided, and the device is used to implement the above embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 6 is a block diagram of a control apparatus for high voltage input according to an embodiment of the present invention, as shown in fig. 6, the apparatus including: an acquisition module 62, a determination module 64, an extraction module 66, and a control module 68, wherein,
an obtaining module 62, configured to obtain a maximum value of an input voltage instantaneous value of a current circuit;
the judging module 64 is electrically connected with the obtaining module 62 and is used for judging whether the maximum value of the instantaneous value of the input voltage obtained by the obtaining module 62 is larger than a preset threshold value or not;
the extraction module 66 is electrically connected with the judgment module 64 and is used for extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value;
a control module 68, electrically connected to the extraction module 66, is configured to adjust the operating state of the input current oscillations in the circuit in accordance with the control strategy extracted by the extraction module 66.
The control device for high-voltage input provided by the embodiment of the invention obtains the maximum value of the input voltage instantaneous value of the current circuit; judging whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold value or not; extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value; the operating state of the input current oscillation in the circuit is adjusted in accordance with a control strategy. The problem of in the correlation technique because lack the control to PFC, lead to high-voltage input reliably stable area heavy load work is solved, and then reached the effect of high-voltage input stable area heavy load work.
Fig. 7 is a block diagram of another structure of a control device for high voltage input according to an embodiment of the present invention, as shown in fig. 7, and optionally, the determining module 64 includes: the judgment unit 641, wherein,
the determining unit 641 is configured to determine that the circuit is in an operating state of input current oscillation when the maximum value of the instantaneous value of the input voltage is greater than a preset threshold.
Fig. 8 is a block diagram of a structure of another control device for high voltage input according to an embodiment of the present invention, as shown in fig. 8, optionally, the control strategy at least includes: under the conditions of the high-voltage boost Bus voltage reference strategy, the inductive current square wave strategy, the driving limit value conduction strategy or the high-voltage shutdown driving strategy, the extraction module 66 includes: a first extraction unit 661, a second extraction unit 662, a third extraction unit 663, and a fourth extraction unit 664, wherein,
the first extracting unit 661, configured to extract a high-voltage boost Bus voltage reference strategy corresponding to a first preset threshold when a maximum value of the instantaneous value of the input voltage is greater than the first preset threshold;
a second extracting unit 662, configured to extract an inductor current square-wave strategy corresponding to a second preset threshold when the maximum value of the instantaneous value of the input voltage is greater than the second preset threshold;
the third extraction unit 663 is configured to extract a driving limit value conduction policy corresponding to a third preset threshold value when the maximum value of the instantaneous value of the input voltage is greater than the third preset threshold value;
the fourth extracting unit 664 is configured to, when the maximum value of the instantaneous value of the input voltage is greater than a fourth preset threshold, extract a high-voltage-shutdown driving strategy corresponding to the fourth preset threshold; wherein, the preset threshold value comprises: the input current oscillation circuit comprises a first preset threshold, a second preset threshold, a third preset threshold and a fourth preset threshold, wherein the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are maximum values of input voltage when the input current starts to oscillate.
Alternatively, fig. 9 is a block diagram of a control device for high voltage input according to another embodiment of the present invention, and as shown in fig. 9, the control module 68 includes: a first control unit 681, a second control unit 682, a third control unit 683, and a fourth control unit 684, wherein,
the first control unit 681 is configured to, when the control policy is a high-voltage boost Bus voltage reference policy, sum a maximum value of an instantaneous value of the input voltage with a preset fixed voltage to obtain a Bus voltage reference;
a second control unit 682, configured to, when the control policy is an inductive current square wave policy, switch the PFC inductive current from a sine wave controlled by the constant on-time to a square wave controlled by the constant current peak, and control the output power when the sine wave controlled by the constant on-time is switched to the square wave controlled by the constant current peak to be equal;
a third control unit 683, configured to, when the control policy is the driving limit on policy, control the PFC drive to decrease with an increase of the instantaneous value of the input voltage in a symmetric region centered on the peak value of the input voltage in a preset period;
the fourth control unit 684 is configured to turn off the PFC driving in a symmetric region centered on a peak value of the input voltage when the control strategy is the high-off driving strategy.
Fig. 10 is a block diagram of a high voltage input control apparatus according to another embodiment of the present invention, and as shown in fig. 10, optionally, the first control unit 681 includes:
the first control subunit 6811 is configured to, after summing the maximum value of the instantaneous value of the input voltage with a preset fixed voltage to obtain a Bus voltage reference, adjust the Bus voltage reference to be smaller than or equal to a rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor, where the rated voltage upper limit is an effective value of the working voltage of the Bus capacitor.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, acquiring the maximum value of the input voltage instantaneous value of the current circuit;
s2, judging whether the maximum value of the instantaneous value of the input voltage is larger than a preset threshold value or not;
s3, extracting a control strategy corresponding to a preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value;
and S4, adjusting the operation state of the input current oscillation in the circuit according to the control strategy.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Optionally, in this embodiment, the determining, by the processor, whether the maximum value of the instantaneous value of the input voltage is greater than a preset threshold is performed according to a program code stored in the storage medium, and includes: when the maximum value of the instantaneous value of the input voltage is larger than a preset threshold value, the circuit is judged to be in an operation state of input current oscillation.
Optionally, in this embodiment, the executing, by the processor, the control policy according to the program code stored in the storage medium at least includes: under the conditions of a high-voltage boost Bus voltage reference strategy, an inductive current square wave strategy, a driving limit value conduction strategy or a high-voltage switch driving strategy, the step of extracting a control strategy corresponding to a preset threshold value comprises the following steps: when the maximum value of the instantaneous value of the input voltage is larger than a first preset threshold value, extracting a high-voltage boost Bus voltage reference strategy corresponding to the first preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a second preset threshold value, extracting an inductive current square wave strategy corresponding to the second preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a third preset threshold value, extracting a driving limit value conduction strategy corresponding to the third preset threshold value; when the maximum value of the instantaneous value of the input voltage is larger than a fourth preset threshold value, extracting a high-voltage switch driving strategy corresponding to the fourth preset threshold value; wherein, the preset threshold value comprises: the input current oscillation circuit comprises a first preset threshold, a second preset threshold, a third preset threshold and a fourth preset threshold, wherein the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are maximum values of input voltage when the input current starts to oscillate.
Optionally, in this embodiment, the step of the processor executing the operation state of the input current oscillation in the regulating circuit according to the control strategy according to the program code stored in the storage medium comprises: when the control strategy is a high-voltage boost Bus voltage reference strategy, summing the maximum value of the instantaneous value of the input voltage and a preset fixed voltage to obtain a Bus voltage reference; when the control strategy is an inductive current square wave strategy, switching the power factor correction PFC inductive current from a sine wave controlled by constant conduction time to a square wave controlled by constant current peak value, and controlling the output power to be equal when the sine wave controlled by the constant conduction time is switched to the square wave controlled by the constant current peak value; when the control strategy is a driving limit value conduction strategy, in a preset period, in a symmetrical area taking the peak value of the input voltage as the center, controlling the PFC driving to reduce along with the increase of the instantaneous value of the input voltage; and when the control strategy is a high-voltage-off drive strategy, the PFC drive is turned off in a symmetrical region with the input voltage peak value as the center.
Optionally, in this embodiment, the processor, according to a program code stored in the storage medium, after summing a maximum value of instantaneous values of the input voltage with a preset fixed voltage to obtain the Bus voltage reference, further includes: and adjusting the Bus voltage reference standard to be less than or equal to the rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor, wherein the rated voltage upper limit is the effective value of the working voltage of the Bus capacitor.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of controlling a high pressure input, comprising:
acquiring the maximum value of the instantaneous value of the input voltage of the current circuit;
judging whether the maximum value of the instantaneous value of the input voltage is larger than a preset threshold value, wherein the preset threshold value comprises the following steps: the method comprises the steps that a first preset threshold value, a second preset threshold value, a third preset threshold value and a fourth preset threshold value are set, and the first preset threshold value, the second preset threshold value, the third preset threshold value and the fourth preset threshold value are maximum values of input voltage when input current starts to oscillate;
under the condition that the maximum value of the instantaneous value of the input voltage is larger than the preset threshold value, extracting a control strategy corresponding to the preset threshold value, and adjusting the operation state of the input current oscillation in the circuit according to the control strategy:
when the maximum value of the input voltage instantaneous value is larger than a first preset threshold value, extracting a Bus voltage reference datum strategy of a high-voltage boost Bus corresponding to the first preset threshold value, and summing the maximum value of the input voltage instantaneous value and a preset fixed voltage to obtain a Bus voltage reference datum;
when the maximum value of the instantaneous value of the input voltage is larger than a second preset threshold value, extracting an inductive current square wave strategy corresponding to the second preset threshold value, switching the power factor correction PFC inductive current from a sine wave controlled by constant conduction time to a square wave controlled by a constant current peak value, and controlling the output power when the sine wave controlled by the constant conduction time is switched to the square wave controlled by the constant current peak value to be equal;
when the maximum value of the input voltage instantaneous value is larger than a third preset threshold value, extracting a driving limit value conduction strategy corresponding to the third preset threshold value, and in a preset period, controlling the PFC driving to be reduced along with the increase of the input voltage instantaneous value in a symmetrical region taking the input voltage peak value as the center;
and when the maximum value of the instantaneous value of the input voltage is greater than a fourth preset threshold value, extracting a high-voltage switch driving strategy corresponding to the fourth preset threshold value, and switching off the PFC driving in a symmetrical region taking the peak value of the input voltage as the center.
2. The method of claim 1, wherein said determining whether the maximum value of the instantaneous value of the input voltage is greater than a predetermined threshold value comprises:
and when the maximum value of the instantaneous value of the input voltage is larger than the preset threshold value, determining that the circuit is in an operation state of input current oscillation.
3. The method of claim 1, further comprising, after summing the maximum value of the instantaneous value of the input voltage with a predetermined fixed voltage to obtain a Bus voltage reference:
and adjusting the Bus voltage reference standard to be less than or equal to the rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor, wherein the rated voltage upper limit is the effective value of the working voltage of the Bus capacitor.
4. A control device for high pressure input, comprising:
the acquisition module is used for acquiring the maximum value of the input voltage instantaneous value of the current circuit; a determining module, configured to determine whether a maximum value of the instantaneous value of the input voltage obtained by the obtaining module is greater than a preset threshold, where the preset threshold includes: the method comprises the steps that a first preset threshold value, a second preset threshold value, a third preset threshold value and a fourth preset threshold value are set, and the first preset threshold value, the second preset threshold value, the third preset threshold value and the fourth preset threshold value are maximum values of input voltage when input current starts to oscillate;
the extraction module is used for extracting a control strategy corresponding to the preset threshold value under the condition that the maximum value of the instantaneous value of the input voltage is larger than the preset threshold value; the extraction module comprises:
the first extraction unit is used for extracting a high-voltage boost Bus voltage reference strategy corresponding to a first preset threshold value when the maximum value of the instantaneous value of the input voltage is greater than the first preset threshold value;
the second extraction unit is used for extracting an inductive current square wave strategy corresponding to a second preset threshold value when the maximum value of the instantaneous value of the input voltage is larger than the second preset threshold value;
the third extraction unit is used for extracting a driving limit value conduction strategy corresponding to a third preset threshold value when the maximum value of the instantaneous value of the input voltage is larger than the third preset threshold value;
the fourth extraction unit is used for extracting a high-voltage switch driving strategy corresponding to a fourth preset threshold when the maximum value of the instantaneous value of the input voltage is greater than the fourth preset threshold;
the control module is used for adjusting the running state of the input current oscillation in the circuit according to the control strategy extracted by the extraction module; the control module includes:
the first control unit is used for summing the maximum value of the input voltage instantaneous value and a preset fixed voltage to obtain a Bus voltage reference when the control strategy is the high-voltage boost Bus voltage reference strategy;
the second control unit is used for switching the sine wave shape controlled by the constant conduction time of the PFC inductive current into the square wave shape controlled by the constant current peak value when the control strategy is the inductive current square wave strategy, and controlling the output power when the sine wave shape controlled by the constant conduction time is switched into the square wave shape controlled by the constant current peak value to be equal;
a third control unit, configured to control, in a preset period, the PFC drive to decrease with an increase of the instantaneous value of the input voltage in a symmetric region centered on a peak value of the input voltage when the control strategy is the driving-limit on strategy;
and the fourth control unit is used for turning off the PFC drive in a symmetrical area taking the peak value of the input voltage as the center when the control strategy is the high-voltage-off drive strategy.
5. The apparatus of claim 4, wherein the determining module comprises:
and the judging unit is used for judging that the circuit is in the operation state of input current oscillation when the maximum value of the instantaneous value of the input voltage is greater than the preset threshold value.
6. The apparatus of claim 4, wherein the first control unit comprises:
and the first control subunit is used for adjusting the Bus voltage reference standard to be smaller than or equal to the rated voltage upper limit according to the rated voltage upper limit of the Bus capacitor after summing the maximum value of the instantaneous value of the input voltage and a preset fixed voltage to obtain the Bus voltage reference standard, wherein the rated voltage upper limit is the effective value of the working voltage of the Bus capacitor.
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| WO2019128033A1 (en) * | 2017-12-29 | 2019-07-04 | 沃尔缇夫能源系统公司 | Power factor correction circuit control method and device |
| CN111371306B (en) * | 2018-12-26 | 2022-04-05 | 致茂电子(苏州)有限公司 | Surge suppression module and power factor correction circuit with surge suppression function |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277061A (en) * | 2007-03-27 | 2008-10-01 | 凌特公司 | Synchronous rectifier control for synchronous boost converter |
| CN101552546A (en) * | 2008-04-02 | 2009-10-07 | 台达电子工业股份有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
| CN103904880A (en) * | 2014-03-04 | 2014-07-02 | 东莞博用电子科技有限公司 | Part active power factor correction circuit controlled by input voltage threshold value |
| CN104393750A (en) * | 2014-11-25 | 2015-03-04 | 广东易事特电源股份有限公司 | Bridgeless PFC (power factor correction) circuit |
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| JP5165344B2 (en) * | 2007-11-14 | 2013-03-21 | ルネサスエレクトロニクス株式会社 | Switching power supply |
| TW201034363A (en) * | 2009-03-13 | 2010-09-16 | Richtek Technology Corp | Buck-boost power converter and its control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277061A (en) * | 2007-03-27 | 2008-10-01 | 凌特公司 | Synchronous rectifier control for synchronous boost converter |
| CN101552546A (en) * | 2008-04-02 | 2009-10-07 | 台达电子工业股份有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
| CN103904880A (en) * | 2014-03-04 | 2014-07-02 | 东莞博用电子科技有限公司 | Part active power factor correction circuit controlled by input voltage threshold value |
| CN104393750A (en) * | 2014-11-25 | 2015-03-04 | 广东易事特电源股份有限公司 | Bridgeless PFC (power factor correction) circuit |
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