CN108964429A - A kind of switching power unit and its output control method - Google Patents
A kind of switching power unit and its output control method Download PDFInfo
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- CN108964429A CN108964429A CN201810764227.1A CN201810764227A CN108964429A CN 108964429 A CN108964429 A CN 108964429A CN 201810764227 A CN201810764227 A CN 201810764227A CN 108964429 A CN108964429 A CN 108964429A
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- ripple voltage
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching power units, it include: the control module being connect with DC/DC converter, the control module includes the low-frequency ripple voltage control loop connecting with DC/DC converter, the output voltage control loop being connect with low-frequency ripple voltage control loop, the output voltage control loop output signal to DC/DC converter；The low-frequency ripple voltage control loop, receive the output voltage sampled signal from DC/DC converter, and the ripple voltage signal extraction comprising 2 times of power frequencies is come out, determine threshold interval belonging to ripple voltage virtual value, and according to the corresponding relationship of preset threshold interval and compensating ripple voltage coefficient, determine the penalty coefficient of ripple voltage, output ripple voltage thermal compensation signal, and by the compensating ripple voltage Signal averaging on the given voltage signal of output voltage control loop.In addition, also disclosing corresponding control method.Using the present invention, realizes and the low-frequency ripple voltage in DC output voltage is precisely compensated for.
Description
Technical field
The present invention relates to switch power technology field, in particular to a kind of switching power unit and its output control method.
Background technique
Currently used switch power supply equipment, substantially all including AC/AC converter and DC/DC converter two parts, thus
It is adapted to input voltage, the output voltage transformation range of exchange, and higher DC output voltage quality may be implemented.Cause
It is single phase ac alternating current for input, the low-frequency ripple of about tens volts of 2 times of power frequencies is generally had in PFC busbar voltage, PFC is female
The amplitude of the more big then low-frequency ripple of line electrolytic capacitor capacity will be smaller.And the low-frequency ripple in PFC busbar voltage can pass through
DC/DC converter is transferred to DC output end, although the pi regulator in DC/DC converter voltage closed loop can be to the low of input
Frequency ripple plays certain modulating action, but can not be reduced in certain range, and stringent defeated in order to meet
The index request of voltage ripple out, can only by increase output electrolytic capacitor capacity or PFC bus electrolytic capacitor capacity come
It realizes, causes power supply device volume larger, higher cost.
In order to solve problem above, there has been proposed a variety of methods, and one of simple method is by software to city
Piezoelectric voltage locking phase, then generate a fixed 2 times power frequency low-frequency ripple offset, be superimposed upon DC output voltage to
On fixed, the disadvantages of the method are as follows not can guarantee inside gamut in the occasion that output voltage range is wide, output power range is wide
There is good compensation effect；It is that main control is done by output-voltage loop there are also a kind of typical method, low-frequency ripple Voltage loop is mended
Control is filled, to realize that the low-frequency ripple to output voltage is transplanted, the disadvantages of this method is mainly included two aspects that first is that it is extracted
The method of low-frequency voltage ripple be it is complex, calculation amount is larger；Second is that the ripple voltage value of extraction is directly superimposed upon electricity by it
On the given value of pressure ring, in the occasion that output voltage range is wide, output power range is wide, it not can guarantee in gamut and has very
Good compensation effect.
Summary of the invention
It is an object of the invention to provide a kind of switching power unit and its output control methods, it is suppressed that low-frequency ripple it is defeated
Out, and the quality of output voltage is improved.
In order to solve the problems existing in the prior art, it includes: AC/DC converter that the present invention, which provides a kind of switching power unit,
The DC/DC converter being connect by PFC bus with AC/DC converter, the control module being connect with DC/DC converter, the control
Molding block includes the low-frequency ripple voltage control loop connecting with DC/DC converter, is connect with low-frequency ripple voltage control loop
Output voltage control loop, the output voltage control loop output signal to DC/DC converter；
The low-frequency ripple voltage control loop receives the output voltage sampled signal from DC/DC converter, and will include 2
The ripple voltage signal extraction of times power frequency comes out, and determines threshold interval belonging to ripple voltage virtual value, and according to preset
The corresponding relationship of threshold interval and compensating ripple voltage coefficient determines the penalty coefficient of ripple voltage, output ripple voltage compensation
Signal, and by the compensating ripple voltage Signal averaging on the given voltage signal of output voltage control loop.
Preferably, the low-frequency ripple voltage control loop includes:
Module is filtered in signal, connect with DC/DC converter, for sampling letter to the output voltage from DC/DC converter
It number is filtered；
Bandpass filter is connect, for by the line of 2 times of power frequencies in output voltage sampled signal with signal filtering processing module
Wave voltage signal individually extracts；
Proportional amplifier is connect with bandpass filter, for amplifying the amplitude for the ripple voltage signal being extracted；
Ripple voltage determines and penalty coefficient selecting module, connect with proportional amplifier, for by the virtual value of ripple voltage and
Preset multiple threshold values are compared, and determine threshold interval belonging to ripple voltage, and according to threshold interval and penalty coefficient
Corresponding relationship determines the penalty coefficient of ripple voltage, exports corresponding compensating ripple voltage signal.
Preferably, the calculating cycle of the virtual value of the ripple voltage is one or more alternating current power frequency periods, the ripple
Voltage determines and penalty coefficient selects the execution period of link for one or more alternating current power frequency periods.
Preferably, the output voltage control loop includes:
Adder, the value for output voltage Setting signal and compensating ripple voltage signal to be overlapped is as output voltage
Given reference value；
Subtracter obtains error amount for making the difference the Setting signal reference value of output voltage with output voltage value of feedback；
Pi regulator obtains the input value of driving generator for the error amount of acquisition to be adjusted；
Drive signal generator for generating corresponding driving signal according to input value, and driving signal is exported to DC/DC and is become
Parallel operation.
Correspondingly, the present invention also provides a kind of switch power source output voltage control methods, this method comprises:
S1 presets the threshold interval and compensating ripple voltage corresponding from different threshold intervals of the virtual value of assessment ripple voltage
Coefficient；
S2 will include 2 times after low-frequency ripple voltage control loop receives the output voltage sampled signal from DC/DC converter
It is come out in the ripple voltage signal extraction of power frequency, determines threshold interval belonging to ripple voltage virtual value, and according to preset threshold
It is worth the corresponding relationship in section and compensating ripple voltage coefficient, determines the compensation system of ripple voltage, output ripple voltage thermal compensation signal,
And it will be on the given voltage signal of the compensating ripple voltage Signal averaging to output voltage control loop；
S3, output voltage control loop generate driving signal according to compensating ripple voltage signal and input voltage Setting signal, and
Driving signal is exported to DC/DC converter.
Preferably, the low-frequency ripple voltage control loop includes that signal filtering processing module, bandpass filter, ratio are put
Big device and ripple voltage determine and penalty coefficient selecting module, the step S2 are specifically included:
Signal filtering processing module is filtered the output voltage sampled signal from DC/DC converter；
Bandpass filter individually extracts output voltage using the ripple voltage signal of 2 times of power frequencies in signal；
Proportional amplifier carries out amplitude amplification to the ripple voltage signal of extraction；
Ripple voltage determines and the virtual value of ripple voltage is compared by penalty coefficient selecting module with preset threshold value, and root
According to the corresponding relationship of preset each threshold interval and penalty coefficient, after the penalty coefficient for determining ripple voltage, output is corresponding
Compensating ripple voltage signal.
Preferably, the output voltage control loop includes drive signal generator, and the step S3 includes:
The value that output voltage Setting signal and compensating ripple voltage signal are overlapped is as the given reference value of output voltage；
The Setting signal reference value of output voltage is made the difference with output voltage value of feedback, obtains error amount；
The error amount of acquisition is adjusted, driving signal input value is obtained；
Corresponding driving signal is generated according to driving signal input value, and driving signal is exported to DC/DC converter.
A kind of output low frequency Ripple Suppression method proposed by the present invention, may be implemented using bandpass filter to 2 times of works
The ripple voltage signal of frequency is accurately extracted, and is determined using ripple voltage and penalty coefficient selection link may be implemented to direct current
Low-frequency ripple voltage on output voltage is precisely compensated for, thus output voltage range is wide, output power range is wide
Occasion can realize the low-frequency ripple voltage compensation effect in gamut well.
Detailed description of the invention
Fig. 1 is a kind of a kind of schematic diagram of embodiment of switching power unit of the present invention；
Fig. 2 is a kind of a kind of schematic diagram of embodiment of Switching Power Supply output control method of the present invention.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Refering to what is shown in Fig. 1, the figure is a kind of a kind of schematic diagram of embodiment of switching power unit of the present invention, the device packet
Include AC/DC converter 1, DC/DC converter 2 and control module 3.Wherein, AC/DC converter 1 is become by PFC bus and DC/DC
Parallel operation connection, DC/DC converter are connect with control module 3, and control module 3 is an annular circuit.In specific implementation, it controls
Molding block 3 is made by carrying out segmented compensation to low-frequency ripple voltage to meet the output voltage range of switching power unit
The wide occasion of output power range can also play good compensation effect.
Control module 3 includes low-frequency ripple voltage control loop and output voltage control loop, wherein low-frequency ripple voltage
Control loop is connect with output voltage control loop.Low-frequency ripple voltage control loop includes signal filtering processing module 311, band
Bandpass filter 312, proportional amplifier 313 and ripple voltage determine and penalty coefficient selecting module 314；Wherein, at signal filtering
Reason module is connect with DC/DC converter, for being filtered to the output voltage sampled signal from DC/DC converter；
Bandpass filter is connect with signal filtering processing module, for the ripple electricity by output voltage using 2 times of power frequencies in signal
Pressure signal individually extracts；Proportional amplifier is connect with bandpass filter, for amplifying the width of the ripple voltage signal extracted
Value；
Ripple voltage determines and penalty coefficient selecting module 314, for carrying out the virtual value of ripple voltage and preset threshold value
Compare, and according to the corresponding relationship of preset each threshold interval and penalty coefficient, it is defeated after the penalty coefficient for determining ripple voltage
Corresponding compensating ripple voltage signal out forms output voltage control closed loop.
Wherein, preset multiple threshold values are stored in ripple voltage judgement and penalty coefficient selecting module 314.For example, setting
Four threshold values are set, are first threshold Vg1, second threshold Vg2, third threshold value Vg3, the 4th threshold value Vg4 respectively, and Vg1 is greater than
It is more than or equal to Vg3 equal to Vg2, Vg2, Vg3 is more than or equal to Vg4；Correspondingly, penalty coefficient is also four, respectively K1, K2, K3
And K4.Wherein, K1 is more than or equal to K2, and K2 is more than or equal to K3, and K3 is more than or equal to K4, and K4 is more than or equal to K5.When specific implementation, such as
The virtual value of fruit ripple voltage Vripple2 is more than or equal to first threshold Vg1, then ripple compensation coefficient uses K1；If
When the virtual value of Vripple2 is less than first threshold Vg1 and is more than or equal to second threshold Vg2, then ripple compensation coefficient uses K2；
If the virtual value of Vripple2 is less than second threshold Vg2 and is more than or equal to third threshold value Vg3, ripple compensation coefficient is used
K3；If the virtual value of Vripple2 is less than third threshold value Vg3 and is more than or equal to the 4th threshold value Vg4, ripple compensation coefficient
Using K4；If the virtual value of Vripple2 is less than the 4th threshold value Vg4, ripple compensation coefficient uses K5.
It can be seen that is, by way of the threshold value of preset assessment ripple voltage, can be compared by the way of segmentation
The accurate penalty coefficient for determining ripple voltage, improves the adaptability of output voltage, can satisfy wider output voltage and
The requirement of output power.
Output voltage control loop 32, including adder 321, adder 322, pi regulator 323 and driving signal occur
Device 324.When specific implementation, output voltage Setting signal is superimposed upon on compensating ripple voltage signal as defeated by adder first
Then the given reference value of voltage out is done the Setting signal reference value of output voltage with output voltage value of feedback by subtracter
Difference obtains error amount；Then, then by error amount of the pi regulator to acquisition it is adjusted, obtains the input value of driving generator；
Finally, generating corresponding driving signal according to input value by drive signal generator, and driving signal is exported to DC/DC and is converted
Device.
The low-frequency ripple voltage control loop of the technical program is preset with the assessment effective threshold value of ripple voltage, therefore can
It, can be according to line when being compensated to ripple voltage ripple voltage to be divided into different sections according to these threshold values
Threshold interval described in wave voltage compensates, thus the output of switching voltage device just can satisfy wider output power and
Output voltage.In addition, output voltage control loop and low-frequency ripple voltage control loop form half-closed loop control, compensation is improved
Precision.
Illustrate another aspect of the present invention below.
With reference to Fig. 2, which is a kind of a kind of schematic diagram of embodiment of Switching Power Supply output control method of the present invention, the party
Method includes the following steps:
Step S1 presets the threshold value for assessing the virtual value of ripple voltage and compensating ripple voltage corresponding from different threshold intervals
Coefficient；
Step S2, low-frequency ripple voltage control loop receive the output voltage sampled signal from DC/DC converter after, will include
The ripple voltage signal extraction of 2 times of power frequencies comes out, and determines threshold interval belonging to ripple voltage virtual value, and according to preset
The corresponding relationship of threshold interval and compensating ripple voltage coefficient determines the compensation system of ripple voltage, output ripple voltage compensation letter
Number, and will be on the given voltage signal of the compensating ripple voltage Signal averaging to output voltage control loop；When specific implementation,
Module can be filtered by signal to be filtered the output voltage sampled signal from DC/DC converter；Pass through
Bandpass filter individually extracts output voltage using the ripple voltage signal of 2 times of power frequencies in signal；Pass through ratio
Amplifier carries out amplitude amplification to the ripple voltage signal of extraction；Determined by ripple voltage and penalty coefficient selecting module is by line
The virtual value of wave voltage is compared with preset threshold value, and according to the corresponding relationship of preset each threshold value and penalty coefficient,
After the penalty coefficient for determining ripple voltage, corresponding compensating ripple voltage signal is exported.
Step S3, output voltage control loop are generated and are driven according to compensating ripple voltage signal and input voltage Setting signal
Dynamic signal, and driving signal is exported to DC/DC converter.When specific implementation, firstly, output voltage Setting signal is superimposed with
Compensating ripple voltage signal, the given reference value as output voltage；By the Setting signal reference value of output voltage and output electricity
Pressure value of feedback makes the difference, and obtains error amount；Then, the error amount of acquisition is adjusted, obtains driving signal input value；Finally,
Corresponding driving signal is generated according to driving signal input value, and driving signal is exported to DC/DC converter.
It should be noted that above-mentioned steps s1 is default step, it is not the step of each starting requires, as long as first
Secondary preset can.
The technical program is preset with the threshold value of assessment ripple voltage average value first, therefore compensates to ripple voltage
When can be compensated according to the threshold interval belonging to ripple voltage, to improve the compensation precision of ripple voltage,
Therefore the output of switching voltage device just can satisfy wider output power and output voltage.
Technical solution of the present invention proposes a kind of output low frequency ripple consistent method and its power supply device, can be in output electricity
The pressure occasion that range is wide, output power range is wide can realize the low-frequency ripple voltage compensation effect in gamut well, fit
It answers range wide, the volume and cost of power supply device can be effectively reduced.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (7)
1. a kind of switching power unit characterized by comprising AC/DC converter is connected by PFC bus and AC/DC converter
The DC/DC converter connect, the control module connecting with DC/DC converter, the control module include connecting with DC/DC converter
Low-frequency ripple voltage control loop, the output voltage control loop being connect with low-frequency ripple voltage control loop, the output
Voltage control loop outputs signal to DC/DC converter；
The low-frequency ripple voltage control loop receives the output voltage sampled signal from DC/DC converter, and will include 2
The ripple voltage signal extraction of times power frequency comes out, and determines threshold interval belonging to ripple voltage virtual value, and according to preset
The corresponding relationship of threshold interval and compensating ripple voltage coefficient determines the penalty coefficient of ripple voltage, output ripple voltage compensation
Signal, and by the compensating ripple voltage Signal averaging on the given voltage signal of output voltage control loop.
2. switching power unit according to claim 1, which is characterized in that the low-frequency ripple voltage control loop packet
It includes:
Module is filtered in signal, connect with DC/DC converter, for sampling letter to the output voltage from DC/DC converter
It number is filtered；
Bandpass filter is connect, for by the line of 2 times of power frequencies in output voltage sampled signal with signal filtering processing module
Wave voltage signal individually extracts；
Proportional amplifier is connect with bandpass filter, for amplifying the amplitude for the ripple voltage signal being extracted；
Ripple voltage determines and penalty coefficient selecting module, connect with proportional amplifier, for by the virtual value of ripple voltage and
Preset multiple threshold values are compared, and determine threshold interval belonging to ripple voltage, and according to threshold interval and penalty coefficient
Corresponding relationship determines the penalty coefficient of ripple voltage, exports corresponding compensating ripple voltage signal.
3. switching power unit according to claim 2, which is characterized in that the calculating week of the virtual value of the ripple voltage
Phase is one or more alternating current power frequency periods, the ripple voltage determine and penalty coefficient to select the execution period of link be one
Or multiple alternating current power frequency periods.
4. switching power unit according to claim 1, which is characterized in that the output voltage control loop includes:
Adder, the value for output voltage Setting signal and compensating ripple voltage signal to be overlapped is as output voltage
Given reference value；
Subtracter obtains error amount for making the difference the Setting signal reference value of output voltage with output voltage value of feedback；
Pi regulator obtains the input value of driving generator for the error amount of acquisition to be adjusted；
Drive signal generator for generating corresponding driving signal according to input value, and driving signal is exported to DC/DC and is become
Parallel operation.
5. a kind of switch power source output voltage control method, the switching power unit of the output voltage control method application, packet
Include DC/DC converter and control module, which is characterized in that the control module includes low-frequency ripple voltage control loop and defeated
Voltage control loop out, which comprises
S1 presets the threshold interval and compensating ripple voltage corresponding from different threshold intervals of the virtual value of assessment ripple voltage
Coefficient；
S2 will include 2 times after low-frequency ripple voltage control loop receives the output voltage sampled signal from DC/DC converter
It is come out in the ripple voltage signal extraction of power frequency, determines threshold interval belonging to ripple voltage virtual value, and according to preset threshold
It is worth the corresponding relationship in section and compensating ripple voltage coefficient, determines the compensation system of ripple voltage, output ripple voltage thermal compensation signal,
And it will be on the given voltage signal of the compensating ripple voltage Signal averaging to output voltage control loop；
S3, output voltage control loop generate driving signal according to compensating ripple voltage signal and input voltage Setting signal, and
Driving signal is exported to DC/DC converter.
6. according to the method described in claim 5, it is characterized in that, the low-frequency ripple voltage control loop includes signal filtering
Processing module, bandpass filter, proportional amplifier and ripple voltage determine and penalty coefficient selecting module, the step S2 are specific
Include:
Signal filtering processing module is filtered the output voltage sampled signal from DC/DC converter；
Bandpass filter individually extracts output voltage using the ripple voltage signal of 2 times of power frequencies in signal；
Proportional amplifier carries out amplitude amplification to the ripple voltage signal of extraction；
Ripple voltage determines and the virtual value of ripple voltage is compared by penalty coefficient selecting module with preset threshold value, and root
According to the corresponding relationship of preset each threshold interval and penalty coefficient, after the penalty coefficient for determining ripple voltage, output is corresponding
Compensating ripple voltage signal.
7. according to the method described in claim 5, it is characterized in that, the output voltage control loop includes driving signal
Device, the step S3 include:
The value that output voltage Setting signal and compensating ripple voltage signal are overlapped is as the given reference value of output voltage；
The Setting signal reference value of output voltage is made the difference with output voltage value of feedback, obtains error amount；
The error amount of acquisition is adjusted, driving signal input value is obtained；
Corresponding driving signal is generated according to driving signal input value, and driving signal is exported to DC/DC converter.
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| CN201810764227.1A CN108964429A (en) | 2018-07-12 | 2018-07-12 | A kind of switching power unit and its output control method |
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| CN110661439A (en) * | 2019-10-28 | 2020-01-07 | 大连海伏科技有限公司 | Device and method for reducing digital switching power supply ripple |
| CN113241936A (en) * | 2021-04-26 | 2021-08-10 | 西安迅湃快速充电技术有限公司 | Control method and controller of DC/DC converter |
| CN114499136A (en) * | 2022-03-31 | 2022-05-13 | 广东高斯宝电气技术有限公司 | Method for inhibiting output power frequency ripple of switching power supply |
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Application publication date: 20181207 |