CN102981540A

CN102981540A - Power feedforward control method and related device

Info

Publication number: CN102981540A
Application number: CN2012104376518A
Authority: CN
Inventors: 侯召政; 贾超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2012-11-06
Filing date: 2012-11-06
Publication date: 2013-03-20
Anticipated expiration: 2032-11-06
Also published as: CN102981540B

Abstract

An embodiment of the invention discloses a power feedforward control method and a related device. The power feedforward control method can comprises sampling and obtaining a first output voltage sampling value at a first output voltage sampling position of a power supply, selecting a first feedforward gain coefficient to serve as an input voltage feedforward gain coefficient of the power supply if an absolute value of difference between the first output voltage sampling value and a reference output voltage value corresponding to the first output voltage sampling position is larger or equal to a first threshold, and selecting a second feedforward gain coefficient to serve as an input voltage feedforward gain coefficient if an absolute value of difference between the first output voltage sampling value and a reference output voltage value is smaller or equal to a second threshold. The scheme provided by the power feedforward control method and the related device conveniently meets the regulating and control requirements for multiple variation rates of input voltage.

Description

Power supply feed forward control method and relevant apparatus

Technical field

The present invention relates to electronic technology field, be specifically related to power supply feed forward control method and relevant apparatus.

Background technology

Power supply commonly used is generally exported constant voltage.When running into the I/O disturbance, be the output voltage of stabilized power source, need to suppress this part disturbance.Especially in input surge, input voltage falls and load dynamic change rate is higher occasion, usually adopt feedforward to solve for input disturbance; Usually adopt modes such as increasing output capacitance, increase dynamic system bandwidth to reduce output impedance for load disturbance, or reduce dynamic output impedance by nonlinear Control and solve.

The research of the digital feed forward control technique aspect of power supply is at present also less, and already present power supply digital feed forward scheme mostly is difficult to satisfy the regulation and control requirement under the various rate of change of input voltage.For example, existing digital feed forward scheme can satisfy the regulation and control requirement that input voltage changes at a slow speed, but the feedforward effect when input voltage changes fast is then relatively poor.

Summary of the invention

The embodiment of the invention provides a kind of power supply feed forward control method and relevant apparatus, in the hope of satisfying the regulation and control requirement under the multiple rate of change of input voltage.

First aspect present invention provides a kind of power supply feed forward control method, comprising:

Obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply;

If the absolute value of the difference of the reference output voltage value that described the first output voltage sampled value is corresponding with described the first output voltage sampling location is more than or equal to first threshold, then select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, wherein, described the first feedforward gain coefficient obtains based on the first input voltage sampled value, and described the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of described power supply;

If the absolute value of the difference of described the first output voltage sampled value and described reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply; Wherein, described the second feedforward gain coefficient obtains based on the second input voltage sampled value, described the second input voltage sampled value obtains with the sampling of the second sampling rate in the second input voltage sampling location of described power supply, described first threshold is more than or equal to described Second Threshold, and described the first sampling rate is higher than described the second sampling rate.

In the possible embodiment of the first of first aspect, described the first feedforward gain coefficient is comprised based on the first input voltage sampled value: find out the first feedforward gain coefficient corresponding to the first input voltage sampled value in default magnitude of voltage and feedforward gain coefficient corresponding relation record; Perhaps, calculate reference input voltage value corresponding to described the first input voltage sampling location and described the first input voltage sampled value ratio, with described ratio as the first feedforward gain coefficient corresponding to described the first input voltage sampled value.

In conjunction with the possible embodiment of the first of first aspect or first aspect, in the possible embodiment of the second, described the second feedforward gain coefficient is comprised based on the second input voltage sampled value: calculate reference input voltage value corresponding to the second input voltage sampling location and described the second input voltage sampled value ratio, with described ratio as the second feedforward gain coefficient corresponding to described the second input voltage sampled value; Perhaps, in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the second feedforward gain coefficient corresponding to described the second input voltage sampled value.

In conjunction with the possible embodiment of the first of first aspect or first aspect or the possible embodiment of the second of first aspect, in the third possible embodiment, described the first feedforward gain coefficient of described selection is as the input voltage feed forward gain coefficient of described power supply, comprise: if the absolute value of the difference of the input voltage feed forward gain coefficient of described the first feedforward gain coefficient and the current use of described power supply more than or equal to the 3rd threshold value, then steps to the first feedforward gain coefficient with fixing or on-fixed step-length with the input voltage feed forward gain coefficient of the current use of described power supply.

In conjunction with the possible embodiment of the second of the possible embodiment of the first of first aspect or first aspect or first aspect or the third possible embodiment of first aspect, in the 4th kind of possible embodiment, described the second feedforward gain coefficient of described selection is as the input voltage feed forward gain coefficient of described power supply, comprise: if the absolute value of the difference of the input voltage feed forward gain coefficient of described the second feedforward gain coefficient and the current use of described power supply more than or equal to the 4th threshold value, then steps to described the second feedforward gain coefficient with fixing or on-fixed step-length with the input voltage feed forward gain coefficient of the current use of described power supply.

In conjunction with the possible embodiment of the first of first aspect or first aspect or possible embodiment or the third possible embodiment of first aspect or the 4th kind of possible embodiment of first aspect of the second of first aspect, in the 5th kind of possible embodiment, described method also comprises: if select described the first feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, then described the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses; If select described the second feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, then described the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses.

In conjunction with the 4th kind of possible embodiment of the third possible embodiment of the possible embodiment of the second of the possible embodiment of the first of first aspect or first aspect or first aspect or first aspect or first aspect or the 5th kind of possible embodiment of first aspect, in the 6th kind of possible embodiment, the first input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the second input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the first output voltage sampling location of described power supply is the voltage output end of described power supply.

In conjunction with the 5th kind of possible embodiment of the 4th kind of possible embodiment of the third possible embodiment of the possible embodiment of the second of the possible embodiment of the first of first aspect or first aspect or first aspect or first aspect or first aspect or first aspect or the 6th kind of possible embodiment of first aspect, in the 7th kind of possible embodiment, described the first input voltage sampled value is obtained with the sampling of the first sampling rate by the first input voltage sampling location of the first analog to digital converter at described power supply, and described the second input voltage sampled value is obtained with the sampling of the second sampling rate by the second input voltage sampling location of the second analog to digital converter at described power supply.

In conjunction with the 6th kind of possible embodiment of the 5th kind of possible embodiment of the 4th kind of possible embodiment of the third possible embodiment of the possible embodiment of the second of the possible embodiment of the first of first aspect or first aspect or first aspect or first aspect or first aspect or first aspect or first aspect or the 7th kind of possible embodiment of first aspect, in the 8th kind of possible embodiment, described the first analog to digital converter is the error simulation digital quantizer; And/or described the second analog to digital converter is successive approximation simulation digital quantizer.

Second aspect present invention provides a kind of power supply feedforward control device, comprising:

The 3rd analog to digital converter is used for obtaining the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply;

Control module, if be used for the absolute value of difference of described the first output voltage sampled value reference output voltage value corresponding with described the first output voltage sampling location more than or equal to first threshold, then select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply; If the absolute value of the difference of described the first output voltage sampled value and described reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply; Wherein, described the first feedforward gain coefficient obtains based on the first input voltage sampled value, and described the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of described power supply; Described the second feedforward gain coefficient obtains based on the second input voltage sampled value, described the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of described power supply, described the first sampling rate is higher than described the second sampling rate, and described first threshold is more than or equal to described Second Threshold.

In the possible embodiment of the first of first aspect, described device also comprises: the first analog to digital converter is used for obtaining described the first input voltage sampled value in the first input voltage sampling location of described power supply with the sampling of the first sampling rate; The second analog to digital converter is used for obtaining described the second input voltage sampled value in the second input voltage sampling location of described power supply with the sampling of the second sampling rate.

In conjunction with the possible embodiment of the first of first aspect or first aspect, in the possible embodiment of the second, described the first analog to digital converter is the error simulation digital quantizer; And/or described the second analog to digital converter is successive approximation simulation digital quantizer; And/or described the 3rd analog to digital converter is error simulation digital quantizer or successive approximation simulation digital quantizer.

In conjunction with the possible embodiment of the first of first aspect or first aspect or the possible embodiment of the second of first aspect, in the third possible embodiment, described control module comprises:

The first control subelement, if be used for the absolute value of difference of described the first output voltage sampled value reference output voltage value corresponding with described the first output voltage sampling location more than or equal to first threshold, and the difference of the input voltage feed forward gain coefficient of described the first feedforward gain coefficient and the current use of described power supply is more than or equal to the 3rd threshold value, then with fixing or on-fixed step-length the input voltage feed forward gain coefficient of the current use of described power supply stepped to the first feedforward gain coefficient; Wherein, described the first feedforward gain coefficient obtains based on the first input voltage sampled value, and described the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of described power supply;

The second control subelement, be less than or equal to Second Threshold if be used for the absolute value of the difference of described the first output voltage sampled value and described reference output voltage value, if and the absolute value of the difference of the input voltage feed forward gain coefficient of described the second feedforward gain coefficient and the current use of described power supply is greater than or equal to the 4th threshold value, then with fixing or on-fixed step-length the input voltage feed forward gain coefficient of the current use of described power supply is stepped to described the second feedforward gain coefficient; Wherein, described the second feedforward gain coefficient obtains based on the second input voltage sampled value, described the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of described power supply, and described first threshold is more than or equal to described Second Threshold.

In conjunction with the possible embodiment of the second of the possible embodiment of the first of first aspect or first aspect or first aspect or the third possible embodiment of first aspect, in the 4th kind of possible embodiment, described power supply feedforward control device also comprises:

The dutycycle acquiring unit, select described the first feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply if be used for described control module, then described the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses; If described control module selects described the second feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, then described the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses.

In conjunction with the possible embodiment of the first of first aspect or first aspect or possible embodiment or the third possible embodiment of first aspect or the 4th kind of possible embodiment of first aspect of the second of first aspect, in the 5th kind of possible embodiment, the first input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the second input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the first output voltage sampling location of described power supply is the voltage output end of described power supply.

Third aspect present invention provides a kind of supply unit, comprising:

Loop of power circuit and the power supply feedforward control device that is connected with described loop of power circuit; Wherein, described power supply feedforward control device is as the described power supply feedforward control device of above-mentioned embodiment.

Therefore, obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply in the embodiment of the invention; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, then select to obtain the first input voltage sampled value and the first feedforward gain coefficient of obtaining with the first sampling rate sampling, as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is less than or equal to Second Threshold, then select to obtain the second input voltage sampled value and the second feedforward gain coefficient of obtaining with the second sampling rate sampling, as the input voltage feed forward gain coefficient of power supply.Because the first sampling rate is higher than the second sampling rate, therefore the feedforward gain coefficient of selecting the sampled value based on different sampling rate analog to digital converters to obtain according to the situation of change of output voltage, be conducive to better meet the regulation and control requirement under the multiple rate of change of input voltage, the voltage fluctuation when being conducive to effectively suppress the input voltage variation; And adopt less hardware costs just can reach and suppress the output disturbance effect, actual effect obviously is with a wide range of applications.

Description of drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic flow sheet of a kind of power supply feed forward control method of providing of the embodiment of the invention;

Fig. 2 is the schematic flow sheet of the another kind of power supply feed forward control method that provides of the embodiment of the invention;

Fig. 3 is the schematic flow sheet of another power supply feed forward control method of providing of the embodiment of the invention;

Fig. 4-a is the synoptic diagram of a kind of power supply feedforward control device of providing of the embodiment of the invention;

Fig. 4-b is the synoptic diagram of the another kind of power supply feedforward control device that provides of the embodiment of the invention;

Fig. 4-c is the synoptic diagram of the another kind of power supply feedforward control device that provides of the embodiment of the invention;

Fig. 4-d is the synoptic diagram of the another kind of power supply feedforward control device that provides of the embodiment of the invention;

Fig. 4-e is the synoptic diagram of the another kind of power supply feedforward control device that provides of the embodiment of the invention;

Fig. 4-f is the synoptic diagram of the another kind of power supply feedforward control device that provides of the embodiment of the invention;

Fig. 5-a is the synoptic diagram of another power supply feedforward control device of providing of the embodiment of the invention;

Fig. 5-b is the synoptic diagram of another power supply feedforward control device of providing of the embodiment of the invention;

Fig. 6 is the schematic flow sheet of a kind of supply unit of providing of the embodiment of the invention.

Embodiment

In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the embodiment of a part of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills should belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Below be elaborated respectively.

Term " first " in instructions of the present invention and claims and the above-mentioned accompanying drawing, " second ", " the 3rd " " 4th " etc. (if exist) are be used to distinguishing similar object, and needn't be used for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in the situation, so as embodiments of the invention described herein for example can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, comprised those steps or unit that process, method, system, product or the equipment of series of steps or unit are not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.

An embodiment of power supply feed forward control method of the present invention, method can comprise: obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is greater than or equal to first threshold, then select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of power supply; If the absolute value of the difference of the first output voltage sampled value and reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; Wherein, the second feedforward gain coefficient obtains based on the second input voltage sampled value, the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of power supply, and first threshold is more than or equal to Second Threshold, and the first sampling rate is higher than the second sampling rate.

See also Fig. 1, Fig. 1 is the schematic flow sheet of a kind of power supply feed forward control method of providing of embodiments of the invention, and a kind of power supply feed forward control method can comprise following content:

101, obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply.

For example, can utilize the 3rd analog to digital converter to obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply.

If the absolute value of the difference of the reference output voltage value that 102 first output voltage sampled values are corresponding with the first output voltage sampling location is more than or equal to first threshold, then select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of power supply.

For example the first input voltage sampled value can be obtained with the sampling of the first sampling rate sampling location by first input voltage of the first analog to digital converter at power supply.

If the absolute value of the difference of 103 first output voltage sampled values and reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; Wherein, the second feedforward gain coefficient obtains based on the second input voltage sampled value, the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of power supply, and first threshold is more than or equal to Second Threshold, and the first sampling rate is higher than the second sampling rate.

For example, the second input voltage sampled value can be obtained with the sampling of the second sampling rate by the second input voltage sampling location of the second analog to digital converter at power supply.Wherein, the 3rd analog to digital converter and the first analog to digital converter or the second analog to digital converter are identical or different, and the sampling rate of the first analog to digital converter is higher than the sampling rate of the second analog to digital converter.

Wherein, the sampling rate of the first analog to digital converter is higher than the sampling rate of the second analog to digital converter.Further, the sampling precision of the first analog to digital converter can be higher than, be equal to or less than the sampling precision of the second analog to digital converter.For instance, the first analog to digital converter for example can be error simulation digital quantizer (EADC, Error Analog-Digital converter), and EADC is a kind of fast low precision analog-digital converter; The second analog to digital converter is successive approximation simulation digital quantizer (SARADC, Successive Approximation Register Analog-Digital converter), and wherein, SARADC is a kind of at a slow speed high-precision analog digital quantizer.Certainly, the first analog to digital converter also can be other different analog to digital converter of sampling rate with the second analog to digital converter.The 3rd analog to digital converter can be the analog-digital converter of EADC or SARADC or other type.

In some embodiments of the invention, if need to use the second input voltage sampled value, any time that then can be before using the second input voltage sampled value, the second analog to digital converter obtains this second input voltage sampled value in the sampling of the second input voltage sampling location of power supply.In like manner, if need to use the first input voltage sampled value, any time that then can be before using the first input voltage sampled value, the first analog to digital converter obtains this first input voltage sampled value in the sampling of the first input voltage sampling location of power supply.

Wherein, reference input voltage value corresponding to the first feedforward gain coefficient=first input voltage sampling location/first input voltage sampled value ± e1, e1 is permissible error.In some embodiments of the invention, the mode that obtains the first feedforward gain coefficient based on the first input voltage sampled value can be diversified, for example calculate reference input voltage value corresponding to the first input voltage sampling location and the first input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the first input voltage sampled value; Perhaps, can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the first feedforward gain coefficient corresponding to the first input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the first input voltage sampled value, then for example also can be with the feedforward gain coefficient that records in institute's recording voltage value in the look-up table and the immediate record of the first input voltage sampled value, as the first feedforward gain coefficient corresponding to the first input voltage sampled value.Wherein, utilize the first feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the first feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

Wherein, reference input voltage value corresponding to the second feedforward gain coefficient=second input voltage sampling location/second input voltage sampled value ± e2, e2 is permissible error.In some embodiments of the invention, the mode that obtains the second feedforward gain coefficient based on the second input voltage sampled value can be diversified, for example, can calculate reference input voltage value corresponding to the second input voltage sampling location and the second input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the second input voltage sampled value; Perhaps can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the second feedforward gain coefficient corresponding to the second input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the second input voltage sampled value, feedforward gain coefficient in the immediate record of the magnitude of voltage that then for example also look-up table can be recorded and the second input voltage sampled value is as the second feedforward gain coefficient corresponding to the second input voltage sampled value.Wherein, utilize the second feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the second feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

In some embodiments of the invention, if the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, if and the absolute value of the difference of the input voltage feed forward gain coefficient of the first feedforward gain coefficient and the current use of power supply more than or equal to the 3rd threshold value (wherein, the 3rd threshold value is specifically set according to actual needs, the span of the 3rd threshold value is for example between 1 ~ 10 times of minimum step, the 3rd threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then can fixed step size (such as 1 ~ 10 times or other multiple of minimum step) or the on-fixed step-length input voltage feed forward gain coefficient of the current use of this power supply is stepped to the first feedforward gain coefficient, wherein the 3rd threshold value is greater than or equal to zero.The value of first threshold can specifically be set according to concrete needs, if the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, can think that then output voltage changes greatly, wherein, change in voltage slope corresponding to first threshold for example can be greater than 100v/ms or other value.

In some embodiments of the invention, if the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, if and the absolute value of the difference of the input voltage feed forward gain coefficient of the second feedforward gain coefficient and the current use of power supply more than or equal to the 4th threshold value (wherein, the 4th threshold value is specifically set according to actual needs, the span of the 4th threshold value is for example between 1 ~ 10 times of minimum step, the 4th threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then can fix (such as 1 ~ 10 times or other multiple of minimum step) or on-fixed step-length the input voltage feed forward gain coefficient of the current use of this power supply is stepped to the second feedforward gain coefficient, wherein, the 4th threshold value is more than or equal to zero, and first threshold is more than or equal to Second Threshold.Wherein, the value of Second Threshold can specifically be set according to concrete needs, when the absolute value of the difference of the first output voltage sampled value reference output voltage value corresponding with the first output voltage sampling location is less than or equal to Second Threshold, it is less to think that then output voltage changes, wherein, the change in voltage slope that Second Threshold is corresponding for example can be less than 100v/ms or other value.

In some embodiments of the invention, the first input voltage sampling location and the second input voltage sampling location can be identical or different, and the first output voltage sampling location can be identical or different from the first input voltage sampling location.For obtaining preferably sample effect, the voltage of the first input voltage sampling location and/or the second input voltage sampling location, and postpone between the voltage of the voltage input end of power supply preferably to be advisable 1 ~ 2 power switch cycle.The voltage of the first input voltage sampling location and the second input voltage sampling location, and the magnitude relationship between the voltage of the voltage input end of power supply is determined, namely to a certain extent, can utilize the input voltage sampled value that obtains of the first input voltage sampling location or the second input voltage sampling location sampling, extrapolate the voltage sample value of the voltage input end of power supply.In like manner, the voltage of the voltage output end of power supply, and the delay between the voltage of the first output voltage sampling location preferably is advisable 1 ~ 2 power switch cycle, the voltage of the first output voltage sampling location, and the magnitude relationship between the voltage of the voltage output end of power supply is determined, namely to a certain extent, the output voltage sampled value that can utilize the first output voltage sampling location sampling to obtain is extrapolated the voltage sample value of the voltage output end of power supply.For instance, the first input voltage sampling location can be the voltage input end of power supply.The second input voltage sampling location can be the voltage input end of power supply.The first output voltage sampling location is the voltage output end of power supply.

In some embodiments of the invention, if select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, then also can further the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that this power supply uses; If select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, then also can further the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that power supply uses.Wherein, the acquisition pattern of feedback loop dutycycle can be diversified, and the difference of the output voltage sampled value that for example can obtain sampling at power output end and the reference output voltage of power output end is carried out loop calculating, obtains the feedback loop dutycycle.Perhaps, also can sample to obtain the potential difference sampled value to the output voltage of power output end and the potential difference of corresponding reference output voltage, this potential difference sampled value be carried out loop calculate the feedback loop dutycycle.So, because the dutycycle that provides for power supply has considered the feedforward gain coefficient of current selection, so be conducive to provide more rational dutycycle for power supply.

Therefore, obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply in the present embodiment; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, then select to obtain the first input voltage sampled value and the first feedforward gain coefficient of obtaining with the first sampling rate sampling, as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is less than or equal to Second Threshold, then select to obtain the second input voltage sampled value and the second feedforward gain coefficient of obtaining with the second sampling rate sampling, as the input voltage feed forward gain coefficient of power supply.Because the first sampling rate is higher than the second sampling rate, therefore according to the situation of change of output voltage, the feedforward gain coefficient of selecting the sampled value based on different sampling rate analog to digital converters to obtain, be conducive to better meet the regulation and control requirement under the multiple rate of change of input voltage, the voltage fluctuation when being conducive to effectively suppress the input voltage variation; And adopt less hardware costs just can reach and suppress the output disturbance effect, actual effect obviously is with a wide range of applications.

For ease of better understanding and implement the such scheme of the embodiment of the invention, below by Fig. 2 and Fig. 3 two kinds of possible embodiments for example.

See also Fig. 2, Fig. 2 is the schematic flow sheet of the another kind of power supply feed forward control method that provides of embodiments of the invention, and another kind of power supply feed forward control method can comprise following content:

201, utilize the first analog to digital converter to obtain the first input voltage sampled value in the sampling of the first input voltage sampling location of power supply.

202, obtain the first feedforward gain coefficient corresponding to the first input voltage sampled value that the sampling of the first analog to digital converter obtains.

203, utilize the second analog to digital converter to obtain the second input voltage sampled value in the sampling of the second input voltage sampling location of power supply, wherein, the sampling rate of the first analog to digital converter is higher than the sampling rate of the second analog to digital converter.

Wherein, there is not inevitable sequencing between step 203 and step 201 or the step 202.

204, obtain the second feedforward gain coefficient corresponding to the second input voltage sampled value that the sampling of the second analog to digital converter obtains.

Wherein, there is not inevitable sequencing between step 204 and step 201 or the step 202.

205, utilize the 3rd analog to digital converter to obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply.

Be appreciated that and do not have inevitable sequencing between step 205 and step 201 ~ step 204.

If the absolute value of the difference of the reference output voltage value that 206 first output voltage sampled values are corresponding with the first output voltage sampling location more than or equal to first threshold, then selects the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the first output voltage sampled value and reference output voltage value less than Second Threshold, then selects the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; Wherein, first threshold is more than or equal to Second Threshold, and the 3rd analog to digital converter and the first analog to digital converter or the second analog to digital converter are identical or different.

See also Fig. 3, Fig. 3 is the schematic flow sheet of another power supply feed forward control method of providing of the embodiment of the invention, and another power supply feed forward control method can comprise following content:

301, utilize the 3rd analog to digital converter to obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply.

If the absolute value of the difference of the reference output voltage value that 302 first output voltage sampled values are corresponding with the first output voltage sampling location more than or equal to first threshold, utilizes the first analog to digital converter to obtain the first input voltage sampled value in the sampling of the first input voltage sampling location of power supply.

303, obtain the first feedforward gain coefficient corresponding to the first input voltage sampled value that the sampling of the first analog to digital converter obtains.

304, select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply.

If the absolute value of the difference of the reference output voltage value that 305 first output voltage sampled values are corresponding with the first output voltage sampling location is less than or equal to Second Threshold, utilize the second analog to digital converter to obtain the second input voltage sampled value in the sampling of the second input voltage sampling location of power supply, wherein, the sampling rate of the first analog to digital converter is higher than the sampling rate of the second analog to digital converter.

306, obtain the second feedforward gain coefficient corresponding to the second input voltage sampled value that the sampling of the second analog to digital converter obtains.

307, select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply.

Wherein, the above also has other possible implementation certainly by Fig. 2 and Fig. 3 two kinds of possible embodiments for example, gives an example no longer one by one herein.

For ease of better implementing embodiment of the invention such scheme, the below also is provided for implementing the relevant apparatus of such scheme.

Referring to Fig. 4-a, a kind of power supply feedforward control device 400 that the embodiment of the invention provides can comprise:

The 3rd analog to digital converter 430 and control module 440.

Wherein, the 3rd analog to digital converter 430 is used for obtaining the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply.

Control module 440, if be used for the absolute value of difference of the first output voltage sampled value that 430 samplings of the 3rd analog to digital converter obtain reference output voltage value corresponding with the first output voltage sampling location more than or equal to first threshold, then select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the first output voltage sampled value and reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; Wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of power supply; The second feedforward gain coefficient obtains based on the second input voltage sampled value, the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of power supply, first threshold is more than or equal to Second Threshold, and the first sampling rate is greater than the second sampling rate.

Referring to Fig. 4-b, in some embodiments of the invention, power supply feedforward control device 400 also can comprise:

The first analog to digital converter 410 and the second analog to digital converter 420.

Wherein, the first analog to digital converter 410 is used for obtaining the first input voltage sampled value in the first input voltage sampling location of power supply with the sampling of the first sampling rate;

The second analog to digital converter 420 is used for obtaining the second input voltage sampled value in the second input voltage sampling location of power supply with the sampling of the second sampling rate.

Wherein, the 3rd analog to digital converter 430 and the first analog to digital converter 410 or the second analog to digital converter 420 are identical or different.

Wherein, the sampling rate of the first analog to digital converter 410 is higher than the sampling rate of the second analog to digital converter 420, and the sampling precision of the first analog to digital converter 410 can be higher than, be equal to or less than the sampling precision of the second analog to digital converter 420.For instance, the second analog to digital converter 420 is SARADC, and the first analog to digital converter 410 for example can be EADC.Certainly, the first analog to digital converter 410 also can be other different analog to digital converter of sampling rate with the second analog to digital converter 420.The 3rd analog to digital converter 430 can be the analog-digital converter of EADC or SARADC or other type.

In some embodiments of the invention, control module 440 can be in several ways, obtain the first feedforward gain coefficient based on the first input voltage sampled value, for example control module 440 can calculate reference input voltage value corresponding to the first input voltage sampling location and the first input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the first input voltage sampled value; Perhaps, control module 440 can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the first feedforward gain coefficient corresponding to the first input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the first input voltage sampled value, then for example also can be with the feedforward gain coefficient that records in institute's recording voltage value in the look-up table and the immediate record of the first input voltage sampled value, as the first feedforward gain coefficient corresponding to the first input voltage sampled value.Wherein, utilize the first feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the first feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

In some embodiments of the invention, control module 440 can be in several ways, obtain the mode of the second feedforward gain coefficient based on the second input voltage sampled value, for example, control module 440 can calculate reference input voltage value corresponding to the second input voltage sampling location and the second input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the second input voltage sampled value; Perhaps, control module 440 can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the second feedforward gain coefficient corresponding to the second input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the second input voltage sampled value, feedforward gain coefficient in the immediate record of the magnitude of voltage that then for example also look-up table can be recorded and the second input voltage sampled value is as the second feedforward gain coefficient corresponding to the second input voltage sampled value.Wherein, utilize the second feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the second feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

Referring to Fig. 4-c, in some embodiments of the invention, control module 440 can comprise: the first control subelement 441 and the second control subelement 442.

Wherein, the first control subelement 441, be greater than or equal to first threshold if be used for the absolute value of the difference of the first output voltage sampled value that 430 samplings of the 3rd analog to digital converter obtain reference output voltage value corresponding with the first output voltage sampling location, and the difference of the input voltage feed forward gain coefficient of the first feedforward gain coefficient and the current use of power supply more than or equal to the 3rd threshold value (wherein, the 3rd threshold value is specifically set according to actual needs, the span of the 3rd threshold value is for example between 1 ~ 10 times of minimum step, the 3rd threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then can fix (such as 1 ~ 10 times or other multiple of minimum step) or on-fixed step-length the input voltage feed forward gain coefficient of the current use of power supply is stepped to the first feedforward gain coefficient; Wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of power supply.

The second control subelement 442, be less than or equal to Second Threshold if be used for the absolute value of the difference of the first output voltage sampled value that 430 samplings of the 3rd analog to digital converter obtain reference output voltage value corresponding with the first output voltage sampling location, if and the absolute value of the difference of the input voltage feed forward gain coefficient of the second feedforward gain coefficient and the current use of power supply is greater than or equal to the 4th threshold value (wherein, the 4th threshold value is specifically set according to actual needs, the span of the 4th threshold value is for example between 1 ~ 10 times of minimum step, the 4th threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then can fix (for example 1 ~ 10 of minimum step times or other multiple) or on-fixed step-length the input voltage feed forward gain coefficient of the current use of power supply is stepped to the second feedforward gain coefficient; Wherein, the second feedforward gain coefficient obtains based on the second input voltage sampled value, and the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of power supply, and first threshold is more than or equal to Second Threshold.

Referring to Fig. 4-d, in some embodiments of the invention, control module 440 also can comprise feedforward gain register 443, wherein, feedforward gain register 443 is used for the first feedforward gain coefficient of storage the first control subelement 441 selections or stores the second feedforward gain coefficient that the second control subelement 442 is selected.

Referring to Fig. 4-e, in some embodiments of the invention, power supply feedforward control device 400 also can further comprise: dutycycle acquiring unit 450, select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply if be used for control module 440, then the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that power supply uses; If control module 440 selects the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, then the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that power supply uses.

Referring to Fig. 4-f, in some embodiments of the invention, power supply feedforward control device 400 also can further comprise: loop computing unit 460 is used for calculating the feedback loop dutycycle.Wherein, the mode that loop computing unit 460 calculates the feedback loop dutycycle can be diversified, for example loop computing unit 460 can carry out loop calculating with the difference of the reference output voltage of power output end with the output voltage sampled value that obtain in power output end sampling, obtains the feedback loop dutycycle.Perhaps, also can sample to obtain the potential difference sampled value to the output voltage of power output end and the potential difference of corresponding reference output voltage, loop computing unit 460 carries out loop with this potential difference sampled value and calculates the feedback loop dutycycle.Perhaps, loop computing unit 460 can to the difference of the first output voltage sampled value that 430 samplings of the 3rd analog to digital converter obtain reference output voltage value corresponding with the first output voltage sampling location, carry out loop and calculate the feedback loop dutycycle.

Be understandable that the function of each functional module of the power supply feedforward control device 400 of present embodiment can be according to the method specific implementation among the said method embodiment, its specific implementation process can with reference to the associated description of said method embodiment, repeat no more herein.

Therefore power supply feedforward control device 400 comprises the 3rd analog to digital converter and control module in the present embodiment, utilizes the 3rd analog to digital converter to obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, then select to obtain the first input voltage sampled value and the first feedforward gain coefficient of obtaining with the first sampling rate sampling, as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is less than or equal to Second Threshold, then select to obtain the second input voltage sampled value and the second feedforward gain coefficient of obtaining with the first sampling rate sampling, as the input voltage feed forward gain coefficient of power supply.Because the first sampling rate is higher than the second sampling rate, therefore according to the situation of change of output voltage, the feedforward gain coefficient of selecting the sampled value based on different sampling rate analog to digital converters to obtain, be conducive to better meet the regulation and control requirement under the multiple rate of change of input voltage, the voltage fluctuation when being conducive to effectively suppress the input voltage variation; And adopt less hardware costs just can reach and suppress the output disturbance effect, actual effect obviously is with a wide range of applications.

Referring to Fig. 5-a, a kind of power supply feedforward control device 500 that the embodiment of the invention provides can comprise: the 3rd analog to digital converter 530, storer 540, processor 550 and output unit 560.Wherein, be connected to example with each parts by bus among the figure, but each parts can connect by other communication mode also certainly.

Wherein, the 3rd analog to digital converter 530 is used for obtaining the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply, and wherein, the 3rd analog to digital converter 530 and the first analog to digital converter 510 or the second analog to digital converter 520 are identical or different.

Processor 550 is carried out following steps: if the absolute value of the difference of the first output voltage sampled value that 530 samplings of the 3rd analog to digital converter obtain reference output voltage value corresponding with the first output voltage sampling location then selects the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply more than or equal to first threshold; If the absolute value of the difference of the first output voltage sampled value and reference output voltage value is less than or equal to Second Threshold, then select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply; Wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is to obtain with the sampling of the first sampling rate in the first input voltage sampling location of power supply; The second feedforward gain coefficient obtains based on the second input voltage sampled value, and the second input voltage sampled value is to obtain with the sampling of the second sampling rate in the second input voltage sampling location of power supply, and first threshold is more than or equal to Second Threshold.

Referring to Fig. 5-b, in some embodiments of the invention, power supply feedforward control device 500 also can comprise:

The first analog to digital converter 510 and the second analog to digital converter 520.

Wherein, the first analog to digital converter 510 is used for obtaining the first input voltage sampled value in the first input voltage sampling location of power supply with the sampling of the first sampling rate;

The second analog to digital converter 520 is used for obtaining the second input voltage sampled value in the second input voltage sampling location of power supply with the sampling of the second sampling rate.

Wherein, the 3rd analog to digital converter 530 and the first analog to digital converter 510 or the second analog to digital converter 520 are identical or different.

Wherein, the sampling rate of the first analog to digital converter 510 is higher than the sampling rate of the second analog to digital converter 520, and the sampling precision of the first analog to digital converter 510 can be higher than, be equal to or less than the sampling precision of the second analog to digital converter 520.For instance, the second analog to digital converter 520 is SARADC, and the first analog to digital converter 510 for example can be EADC.Certainly, the first analog to digital converter 510 also can be other different analog to digital converter of sampling rate with the second analog to digital converter 520.The 3rd analog to digital converter 530 can be the analog-digital converter of EADC or SARADC or other type.

The first analog to digital converter 510 is used for obtaining the first input voltage sampled value in the sampling of the first input voltage sampling location of power supply.The second analog to digital converter 520 is used for obtaining the second input voltage sampled value in the sampling of the second input voltage sampling location of power supply.

In some embodiments of the invention, processor 550 can in several ways, obtain the first feedforward gain coefficient based on the first input voltage sampled value, for example.Processor 550 can calculate reference input voltage value corresponding to the first input voltage sampling location and the first input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the first input voltage sampled value; Perhaps, processor 550 can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the first feedforward gain coefficient corresponding to the first input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the first input voltage sampled value, then for example also can be with the feedforward gain coefficient that records in institute's recording voltage value in the look-up table and the immediate record of the first input voltage sampled value, as the first feedforward gain coefficient corresponding to the first input voltage sampled value.Wherein, utilize the first feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the first feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

In some embodiments of the invention, processor 550 can be in several ways, obtain the mode of the second feedforward gain coefficient based on the second input voltage sampled value, for example, processor 550 can calculate reference input voltage value corresponding to the second input voltage sampling location and the second input voltage sampled value ratio, with this ratio as the first feedforward gain coefficient corresponding to the second input voltage sampled value; Perhaps, processor 550 can be in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the second feedforward gain coefficient corresponding to the second input voltage sampled value, wherein, for example can be by default magnitude of voltage and the feedforward gain coefficient corresponding relation of look-up table record, especially, if in look-up table, there is not the magnitude of voltage of record in any one record to equal the second input voltage sampled value, feedforward gain coefficient in the immediate record of the magnitude of voltage that then for example also look-up table can be recorded and the second input voltage sampled value is as the second feedforward gain coefficient corresponding to the second input voltage sampled value.Wherein, utilize the second feedforward gain coefficient that gets access to offset to a certain extent input and change the output pulsation that causes.For example, the input voltage of supposing power input is 48V from the reference input voltage of 48V(hypothesis power input) change to 60V, then the second feedforward gain coefficient for example can be changed to 0.8 from 1, changes the output pulsation that causes in order to offset input.

In some embodiments of the invention, if the absolute value of the difference of the reference output voltage value that the first output voltage sampled value that 530 samplings of the 3rd analog to digital converter obtain is corresponding with the first output voltage sampling location is greater than or equal to first threshold, and the difference of the input voltage feed forward gain coefficient of the first feedforward gain coefficient and the current use of power supply more than or equal to the 3rd threshold value (wherein, the 3rd threshold value is concrete the setting according to actual needs, the span of the 3rd threshold value is for example between 1 ~ 10 times of minimum step, the 3rd threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then processor 550 can be fixed (for example 1 ~ 10 of minimum step times or other multiple) or on-fixed step-length the input voltage feed forward gain coefficient of the current use of power supply is stepped to the first feedforward gain coefficient; Wherein, the first feedforward gain coefficient obtains based on the first input voltage sampled value, and the first input voltage sampled value is obtained with the sampling of the first sampling rate by the first input voltage sampling location of the first analog to digital converter 510 at power supply.

In some embodiments of the invention, if the absolute value of the difference of the reference output voltage value that the first output voltage sampled value that 530 samplings of the 3rd analog to digital converter obtain is corresponding with the first output voltage sampling location is less than or equal to Second Threshold, if and the absolute value of the difference of the input voltage feed forward gain coefficient of the second feedforward gain coefficient and the current use of power supply is greater than or equal to the 4th threshold value (wherein, the 4th threshold value is specifically set according to actual needs, the span of the 4th threshold value is for example between 1 ~ 10 times of minimum step, the 4th threshold value is for example got minimum step, certainly its value also can be the value that other can be satisfied the demand), then processor 550 can be fixed (such as 1 ~ 10 times or other multiple of minimum step) or on-fixed step-length the input voltage feed forward gain coefficient of the current use of power supply is stepped to the second feedforward gain coefficient; Wherein, the second feedforward gain coefficient obtains based on the second input voltage sampled value, the second input voltage sampled value is obtained with the sampling of the second sampling rate by the second input voltage sampling location of the second analog to digital converter 520 at power supply, and first threshold is more than or equal to Second Threshold.

In some embodiments of the invention, processor 550 also can further be carried out following steps: if select the first feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, then the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that power supply uses; If select the second feedforward gain coefficient as the input voltage feed forward gain coefficient of power supply, then the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that power supply uses.

Be understandable that the function of each functional module of the power supply feedforward control device 500 of present embodiment can be according to the method specific implementation among the said method embodiment, its specific implementation process can with reference to the associated description of said method embodiment, repeat no more herein.

Therefore power supply feedforward control device 500 comprises the 3rd analog to digital converter and processor in the present embodiment, utilizes the 3rd analog to digital converter to obtain the first output voltage sampled value in the sampling of the first output voltage sampling location of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is more than or equal to first threshold, then select to obtain the first input voltage sampled value and the first feedforward gain coefficient of obtaining with the first sampling rate sampling, as the input voltage feed forward gain coefficient of power supply; If the absolute value of the difference of the reference output voltage value that the first output voltage sampled value is corresponding with the first output voltage sampling location is less than or equal to Second Threshold, then select to obtain the second input voltage sampled value and the second feedforward gain coefficient of obtaining with the second sampling rate sampling, as the input voltage feed forward gain coefficient of power supply.Because the first sampling rate is higher than the second sampling rate, therefore if according to the situation of change of output voltage, the feedforward gain coefficient of selecting the sampled value based on different sampling rate analog to digital converters to obtain, be conducive to better meet the regulation and control requirement under the multiple rate of change of input voltage, the voltage fluctuation when being conducive to effectively suppress the input voltage variation; And adopt less hardware costs just can reach and suppress the output disturbance effect, actual effect obviously is with a wide range of applications.

Referring to Fig. 6, the embodiment of the invention also provides a kind of supply unit 600, comprising:

Loop of power circuit 610 and the power supply feedforward control device 620 that is connected with loop of power circuit.

Wherein, power supply feedforward control device 620 for example can be power supply feedforward control device 400 or the power supply feedforward control device 500 of describing in above-described embodiment, the dependency structure of power supply feedforward control device 620 and function can with reference to the associated description of above-described embodiment about power supply feedforward control device 400 or power supply feedforward control device 500, repeat no more herein.

The embodiment of the invention also provides a kind of computer-readable storage medium, and wherein, this computer-readable storage medium can have program stored therein, and this program comprises the part or all of step of the power supply feed forward control method of putting down in writing among the said method embodiment when carrying out.

Need to prove, for aforesaid each embodiment of the method, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the instructions all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.

In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can be referring to the associated description of other embodiment.

In several embodiment that the application provides, should be understood that disclosed device can be realized by another way.For example, device embodiment described above only is schematic, the for example division of described unit, only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, the shown or coupling each other discussed or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically or other form.

Described unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of unit to realize the purpose of present embodiment scheme.

In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics of unit exists, and also can be integrated in the unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.

If described integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprises that some instructions are used so that a computer equipment (can be personal computer, server or the network equipment etc.) is carried out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: the various media that can be program code stored such as USB flash disk, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or CD.

The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims

1. a power supply feed forward control method is characterized in that, comprising:

2. method according to claim 1 is characterized in that,

Described the first feedforward gain coefficient is comprised based on the first input voltage sampled value: find out the first feedforward gain coefficient corresponding to the first input voltage sampled value in default magnitude of voltage and feedforward gain coefficient corresponding relation record; Perhaps, calculate reference input voltage value corresponding to described the first input voltage sampling location and described the first input voltage sampled value ratio, with described ratio as the first feedforward gain coefficient corresponding to described the first input voltage sampled value.

3. method according to claim 1 and 2 is characterized in that,

Described the second feedforward gain coefficient is comprised based on the second input voltage sampled value: calculate reference input voltage value corresponding to the second input voltage sampling location and described the second input voltage sampled value ratio, with described ratio as the second feedforward gain coefficient corresponding to described the second input voltage sampled value; Perhaps, in default magnitude of voltage and feedforward gain coefficient corresponding relation record, find out the second feedforward gain coefficient corresponding to described the second input voltage sampled value.

4. according to claim 1 to 3 each described methods, it is characterized in that, described the first feedforward gain coefficient of described selection is as the input voltage feed forward gain coefficient of described power supply, comprise: if the absolute value of the difference of the input voltage feed forward gain coefficient of described the first feedforward gain coefficient and the current use of described power supply more than or equal to the 3rd threshold value, then steps to the first feedforward gain coefficient with fixing or on-fixed step-length with the input voltage feed forward gain coefficient of the current use of described power supply.

5. according to claim 1 to 4 each described methods, it is characterized in that, described the second feedforward gain coefficient of described selection is as the input voltage feed forward gain coefficient of described power supply, comprise: if the absolute value of the difference of the input voltage feed forward gain coefficient of described the second feedforward gain coefficient and the current use of described power supply more than or equal to the 4th threshold value, then steps to described the second feedforward gain coefficient with fixing or on-fixed step-length with the input voltage feed forward gain coefficient of the current use of described power supply.

6. according to claim 1 to 5 each described methods, it is characterized in that,

Described method also comprises: if select described the first feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, then described the first feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses; If select described the second feedforward gain coefficient as the input voltage feed forward gain coefficient of described power supply, then described the second feedforward gain coefficient and feedback loop dutycycle be multiply by mutually and produce the dutycycle that described power supply uses.

7. according to claim 1 to 6 each described methods, it is characterized in that the first input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the second input voltage sampling location of described power supply is the voltage input end of described power supply; And/or the first output voltage sampling location of described power supply is the voltage output end of described power supply.

8. a power supply feedforward control device is characterized in that, comprising:

9. power supply feedforward control device according to claim 8 is characterized in that,

Described power supply feedforward control device also comprises: the first analog to digital converter is used for obtaining described the first input voltage sampled value in the first input voltage sampling location of described power supply with the sampling of the first sampling rate; The second analog to digital converter is used for obtaining described the second input voltage sampled value in the second input voltage sampling location of described power supply with the sampling of the second sampling rate.

10. according to claim 8 to 9 each described power supply feedforward control devices, it is characterized in that,

Described the first analog to digital converter is the error simulation digital quantizer; And/or,

Described the second analog to digital converter is successive approximation simulation digital quantizer; And/or,

Described the 3rd analog to digital converter is error simulation digital quantizer or successive approximation simulation digital quantizer.

11. to 10 each described power supply feedforward control devices, it is characterized in that according to claim 8,

Described control module comprises:

12. to 11 each described power supply feedforward control devices, it is characterized in that according to claim 8,

Described power supply feedforward control device also comprises:

13. to 12 each described power supply feedforward control devices, it is characterized in that according to claim 8,

The first input voltage sampling location of described power supply is the voltage input end of described power supply; And/or,

The second input voltage sampling location of described power supply is the voltage input end of described power supply; And/or,

The first output voltage sampling location of described power supply is the voltage output end of described power supply.

14. a supply unit is characterized in that, comprising:

Loop of power circuit and the power supply feedforward control device that is connected with described loop of power circuit;

Wherein, described power supply feedforward control device is such as each described power supply feedforward control device of claim 8 to 13.