CN111293866A - Irregular ripple active compensation circuit, active compensation method and power supply system - Google Patents

Irregular ripple active compensation circuit, active compensation method and power supply system Download PDF

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Publication number
CN111293866A
CN111293866A CN201811487295.4A CN201811487295A CN111293866A CN 111293866 A CN111293866 A CN 111293866A CN 201811487295 A CN201811487295 A CN 201811487295A CN 111293866 A CN111293866 A CN 111293866A
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China
Prior art keywords
signal
power supply
ripple
module
irregular
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CN201811487295.4A
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Chinese (zh)
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毛广甫
徐小宏
吴璟钥
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Repower Technology Co ltd
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Repower Technology Co ltd
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Priority to CN201811487295.4A priority Critical patent/CN111293866A/en
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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

Abstract

An irregular ripple active compensation circuit, an irregular ripple active compensation method and a power supply system; the irregular ripple active compensation circuit comprises: the device comprises a synchronous rectification module, a first sampling module, a second sampling module, a ripple processing module, a signal generation module and a signal modulation module; the synchronous rectification module synchronously rectifies the direct-current power supply according to the first driving signal and the second driving signal and outputs a compensation signal with the polarity opposite to that of interference ripples in the power supply; the first sampling module collects the compensation signal in real time and obtains a current sampling signal; the second sampling module collects alternating current ripples of the power supply; the current sampling signal and the alternating current ripple are processed and modulated to obtain two paths of complementary first driving signals and second driving signals, and the working state of the synchronous rectification module is changed through the first driving signals and the second driving signals, so that the compensation signals can achieve the effect of adjusting the interference ripple in the power supply.

Description

Irregular ripple active compensation circuit, active compensation method and power supply system
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to an irregular ripple active compensation circuit, an irregular ripple active compensation method and a power supply system.
Background
The power supply ripple is a fluctuation phenomenon in the voltage/current output by the power supply, and in the practical application process, a stable power supply is usually formed by an alternating current power supply after links such as voltage stabilization processing, so in the process, an alternating current component can exist in the voltage/current output by the power supply, the alternating current component can cause instability of a power system, the voltage/current output by the power supply cannot be accurately measured, further, peak current/peak voltage easily appears in the electric energy accessed by electronic components, the power equipment is in an extremely unstable working state, electric power safety accidents can even be caused by serious power supply ripple, and the application range of the power supply is limited.
Because ripples exist in the current/voltage output by the power supply, the precision of the power output by the power supply is low, and the electronic equipment cannot be in a rated working state; in the conventional technology, on one hand, the digital A/D sampling of the power supply is discrete, and is limited by factors such as sampling period, the A/D sampling rate generally can only reach several KHz to ten and several KHz, the ripple detection precision can only draw a simple envelope waveform with the frequency below one hundred Hz, and for the waveform above 200Hz, the higher the frequency, the more the conventional technology can not completely draw the real phase of the power supply ripple, so that the digital control ripple collecting circuit can not restore the required high-frequency current signal in real time, the collected signal is distorted, and the real ripple in the power supply output electric energy can not be effectively controlled; on the other hand, because various types of current ripple signals exist in the electric energy output by the power supply, wherein the current ripple signals include a high-frequency alternating-current component, a low-frequency alternating-current component and the like, and in the process of processing the current ripple signals in the power supply by the conventional technology, the stability of the direct-current component and the low-frequency alternating-current component in the power supply is also affected, certain electric energy loss is generated, and the overall quality of the power supply is affected.
In summary, the conventional technology cannot accurately sample the high-frequency ripple in the current ripple signal in a classified manner, and cannot adjust the high-frequency ripple in the irregular ripple in the power supply, which results in a problem of low accuracy of the power supply.
Disclosure of Invention
In view of this, embodiments of the present invention provide an irregular ripple active compensation circuit, an irregular ripple active compensation method, and a power supply system, and aim to solve the problems that a conventional technical scheme cannot adjust a high-frequency ripple signal in an irregular ripple, and a voltage/current precision of a power output is low, so that an irregular ac interference component exists in a power output by the power output, and a power system is unstable and is difficult to be generally applied.
A first aspect of an embodiment of the present invention provides an irregular ripple active compensation circuit, connected to a power supply, where the irregular ripple active compensation circuit includes:
the power supply comprises a power supply input end, a synchronous rectification module, a first driving signal, a second driving signal and a compensation signal, wherein the power supply input end is connected with a direct-current power supply, is connected with the first driving signal and the second driving signal, and is configured to output the compensation signal with the polarity opposite to that of interference ripples in the power supply after synchronously rectifying electric energy of the direct-current power supply according to the first driving signal and the second driving signal;
the first sampling module is connected with the synchronous rectification module and is configured to sample the compensation signal to obtain a current sampling signal;
the second sampling module is connected with the power supply and is configured to collect alternating current ripples of the power supply;
the ripple processing module is connected with the first sampling module and the second sampling module and configured to process the alternating current ripple and the current sampling signal to obtain a first ripple signal;
a signal generation module configured to generate a triangular wave signal; and
and the signal modulation module is connected with the ripple processing module, the signal generation module and the synchronous rectification module and is configured to modulate the first ripple signal and the triangular wave signal to generate two complementary paths of the first driving signal and the second driving signal.
In one embodiment, the interference ripple comprises: and high-frequency ripples and harmonic waves in alternating current ripples of the power supply.
In one embodiment, the irregular ripple active compensation circuit further includes:
and the filtering module is connected between the second sampling module and the ripple processing module and is configured to carry out high-pass filtering on the alternating current ripple.
In one embodiment, the ripple processing module includes:
a first signal amplifier connected to the first sampling module and configured to scale the current sampling signal;
the second signal amplifier is connected with the second sampling module and is configured to amplify the alternating current ripple of the power supply in proportion;
the adder is connected with the first signal amplifier and the second signal amplifier and is configured to add the proportional amplified current sampling signal and the proportional amplified alternating current ripple to obtain a first ripple signal; and
an inverting integrator connected between the adder and the signal modulation module and configured to invert the first ripple signal.
In one embodiment, the irregular ripple active compensation circuit further includes:
a first PWM driving circuit connected between the signal modulation module and the synchronous rectification module and configured to PWM rectify the first driving signal;
and the second PWM driving circuit is connected between the signal modulation module and the synchronous rectification module and is configured to perform PWM rectification on the second driving signal.
In one embodiment thereof, the synchronous rectification module comprises:
the power supply input end is connected with the direct-current power supply, and the common mode rejection unit is configured to carry out common mode signal rejection on electric energy of the direct-current power supply;
the control end is connected with the first driving signal, the first conducting end is connected with the first power output end of the common mode rejection unit, and the first switching unit is configured to be switched on or switched off according to the first driving signal;
the control end is connected with the second driving signal, the second conducting end is connected with the second power output end of the common mode rejection unit, and the second switching unit is configured to be switched on or switched off according to the second driving signal;
the second conducting end of the first switch unit and the first conducting end of the second switch unit are connected in common to output a first alternating current signal;
the first sampling module is configured to receive the first alternating current signal, and the second sampling module is configured to sample the first alternating current signal; and
and the isolation unit is connected with the other end of the differential unit and is configured to filter a direct current component and a low-frequency alternating current component of the differentiated first alternating current signal so as to output the compensation signal.
In one embodiment, the common mode rejection unit includes: a common mode inductor;
the first switching unit includes: the first switch tube and the first diode;
the second switching unit includes: a second switch tube and a second diode;
the differentiation unit includes: at least two inductors connected in series;
the isolation unit includes: a plurality of capacitors connected in parallel.
In one embodiment, the first switch tube is an MOS tube or an IGBT, and the second switch tube is an MOS tube or an IGBT.
A second aspect of the embodiments of the present invention provides an irregular ripple active compensation method, which is applied to a power supply, and the irregular ripple active compensation method includes:
providing a direct current power supply, and synchronously rectifying the direct current power supply to load a compensation signal to the output of the power supply;
sampling the output of the power supply to obtain an alternating current ripple comprising interference ripples;
sampling the compensation signal to obtain a current sampling signal;
processing the alternating current ripple and the current sampling signal to obtain a first ripple signal;
accessing a triangular wave signal and the first ripple signal for modulation to obtain two complementary isolated driving signals;
and adjusting the direct-current power supply by utilizing two complementary isolated driving signals to enable the compensation signal and the interference ripple to have opposite polarities.
A third aspect of an embodiment of the present invention provides a power supply system, including:
the power supply comprises a power supply source, a direct-current power supply and the irregular ripple active compensation circuit, wherein the irregular ripple active compensation circuit is connected with the power supply source and the direct-current power supply;
the irregular ripple active compensation circuit adjusts the direct current power supply so that the direct current power supply outputs a compensation signal with the polarity opposite to that of interference ripples in the power supply, and the interference ripples in the power supply are inversely compensated through the compensation signal.
The irregular ripple active compensation circuit synchronously rectifies electric energy of a direct-current power supply through the synchronous rectification module to output a compensation signal with a polarity opposite to that of interference ripples in the power supply, the first sampling module and the second sampling module can respectively sample and process the compensation signal and an alternating-current ripple signal of the power supply to generate a driving signal, the working state of the synchronous rectification module is controlled through the driving signal to form an internal dynamic feedback loop of the irregular ripple compensation circuit, and the compensation signal required to be generated by the synchronous rectification module is directly adjusted according to the variation state of the alternating-current ripples in the power supply; interference ripples in the power supply are eliminated through compensation ripples in the compensation signals, the precision and the quality of the power supply are improved on the basis of not influencing the power supply performance of the power supply, the control response speed is extremely high, the application range is wide, and the method can be used in the fields of precision current source design, harmonic compensation, battery detection equipment and the like; the problems that the accuracy of electric energy output by a power supply is low, the stability and the reliability are poor and the practical value is not high due to the fact that high-frequency components in the irregular ripples are difficult to collect when the irregular ripples cannot be adjusted by the traditional technology are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of an irregular ripple active compensation circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of another irregular ripple active compensation circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of another irregular ripple active compensation circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of another irregular ripple active compensation circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of another irregular ripple active compensation circuit according to an embodiment of the present invention;
fig. 6 is a circuit structure diagram of a synchronous rectification module according to an embodiment of the present invention;
fig. 7 is a flowchart of an implementation of an irregular ripple active compensation method according to an embodiment of the present invention;
fig. 8 is a block diagram of a power supply system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a module structure of an irregular ripple active compensation circuit 10 according to an embodiment of the present invention, where the irregular active compensation circuit 10 is connected to a power supply 20, and when the power supply 20 outputs a voltage/current, the irregular active compensation circuit 10 can obtain irregular ripple information and perform an inverse compensation function on the irregular ripple, so as to filter interference ripples in the power supply 20, thereby greatly improving the precision of the power supply 20, and the irregular ripple active compensation circuit 10 in this embodiment can be applied to various industrial fields, and has a very high practical value; for convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:
the irregular ripple active compensation circuit 10 includes: the synchronous rectification module 101, the first sampling module 102, the second sampling module 103, the ripple processing module 104, the signal generation module 105, and the signal modulation module 106.
The power input end of the synchronous rectification module 101 is connected to the dc power supply 30, the synchronous rectification module 101 is connected to the first driving signal and the second driving signal, and the synchronous rectification module 101 outputs a compensation signal having a polarity opposite to that of an interference ripple in the power supply 20 after synchronously rectifying the electric energy of the dc power supply 30 according to the first driving signal and the second driving signal.
The power supply 20 can output electric energy, and the electric energy can drive a load to realize corresponding circuit functions; moreover, interference ripples exist in the electric energy output by the power supply 20, the interference ripples will cause the electric energy output by the power supply 20 to have an unstable phenomenon, and the electric energy accessed by the load has a large fluctuation; the rectification output end of the synchronous rectification module 101 can output a compensation signal, the compensation ripple and the interference ripple in the compensation signal have a relationship with opposite polarity, and when the main power circuit of the power supply 20 is connected to the compensation signal, the interference ripple can be eliminated through the compensation ripple, so that the fluctuation of electric energy in the power supply 20 is reduced, and the precision and the quality of the power supply 20 are improved.
As a specific implementation manner, the synchronous rectification module 101 may change the amplitude and the polarity of the electric energy output by the dc power supply, and the working state of the synchronous rectification module 101 may be changed by the first driving signal and the second driving signal, optionally, when the first driving signal and the second driving signal are in different level states, respectively, after the synchronous rectification module 101 may perform synchronous rectification on the dc power supply, the compensation ripple with different polarity and amplitude may be output, so as to implement an inverse compensation function on the interference ripple of the power supply 20; therefore, the irregular ripple active compensation circuit 10 in this embodiment can utilize the synchronous rectification module 101 to adjust the interference ripple in the power supply 20, and has the advantages of simple operation and extremely strong compatibility, thereby effectively improving the control response speed of the irregular ripple active compensation circuit 10 on the power supply 20.
The first sampling module 102 is connected to the synchronous rectification module 101, and the first sampling module 102 samples the compensation signal to obtain a current sampling signal.
The first sampling module 102 can monitor the compensation signal output by the synchronous rectification module 101 in real time, the first sampling module 102 generates a current sampling signal, the working state of the synchronous rectification module 101 can be obtained through the current sampling signal, the controllability of the irregular ripple active compensation circuit 10 is improved, the irregular ripple active compensation circuit 10 has a very high control response speed, and the sampling precision of the compensation signal is higher.
The second sampling module 103 is connected with the power supply 20, and the second sampling module 103 collects the ac ripple of the power supply 20;
the alternating current ripple in the power supply 20 is extremely irregular, and the fluctuation of the voltage/current output by the power supply 20 is extremely large, in this embodiment, the second sampling module 103 can collect the current fluctuation information in the power supply 20 in real time, and the second sampling module 103 can monitor the electric energy fluctuation condition in the power supply 20, so that the collection precision is extremely high; the irregular ripple active compensation circuit 10 can obtain real ac ripples in the power supply 20 through the second sampling module 103, and then the irregular ripple active compensation circuit 10 can filter the interference ripples in the power supply 20 in time, so that the compensation accuracy of the irregular ripple active compensation circuit 10 to the interference ripple information in the power supply 20 in this embodiment is improved, and the control performance of the irregular ripple active compensation circuit 10 is better.
As an optional implementation manner, the second sampling module 103 includes a current sensor, where the current sensor can accurately detect the change information of the electric energy in the power supply 20, and the current sensor can obtain the ac ripple of the power supply 20 in real time, so that the power consumption is low, and the sampling rate is extremely fast; therefore, the sampling precision of the alternating current ripple can be greatly improved through the current sensor, the ripple sampling cost of the power supply 20 is reduced, the control accuracy in the irregular ripple active compensation circuit 10 is guaranteed, and the stability of the output power of the power supply 20 is stronger.
The ripple processing module 104 is connected to the first sampling module 102 and the second sampling module 103, and the ripple processing module 104 processes the ac ripple and current sampling signal to obtain a first ripple signal.
The second sampling module 103 transmits the ac ripple to the ripple processing module 104, the first sampling module 102 transmits the current sampling signal to the ripple processing module 104, and the ripple processing module 104 can fuse interference ripple information and information of the current sampling signal to obtain a first ripple signal; according to the ripple information in the compensation signal and the ripple information in the power supply 20, the ripple information in the compensation signal and the ripple information in the power supply 20 can be obtained according to the first ripple signal, which helps the irregular ripple active compensation circuit 10 in this embodiment to control the ac ripple in the power supply 20 in real time, and realize accurate adjustment of the interference ripple in the power supply 20, the ripple processing module 104 has complete signal processing and analyzing capability, the dynamic feedback control rate of the irregular ripple active compensation circuit 10 is accelerated, and the irregular ripple active compensation circuit 10 has a wide application range.
The signal generation module 105 generates a triangular wave signal.
The triangular wave signal has different frequencies and amplitudes, and optionally, the frequency and the amplitude of the triangular wave signal may be preset according to the frequency and the amplitude of the first ripple signal and the working state of the synchronous rectification module 101; the irregular ripple active compensation circuit 10 can be in different working states through the triangular wave signal, and corresponding circuit functions are realized; the signal generation module 105 can provide different frequency information to the irregular ripple active compensation circuit 10, and the irregular ripple active compensation circuit 10 realizes the best comprehensive control capability to the ac ripple in the power supply 20, so that the control stability of the irregular ripple active compensation circuit 10 is stronger, the dynamic feedback performance is better, and the electric energy stability and accuracy in the power supply 20 are improved.
The signal modulation module 106 is connected to the ripple processing module 104, the signal generation module 105, and the synchronous rectification module 101, and the signal modulation module 106 modulates the first ripple signal and the triangular wave signal to generate two complementary first driving signals and second driving signals.
When the ripple processing module 104 transmits the first ripple signal to the signal modulation module 106, the signal generation module 105 transmits a triangular wave signal to the signal modulation module 106, and the signal modulation module 106 can generate two paths of isolated complementary PWM waves, that is, a first driving signal and a second driving signal; optionally, the phases of the first driving signal and the second driving signal are staggered; the signal modulation module 106 transmits the first driving signal and the second driving signal to the synchronous rectification module 101, and adjusts the working state of the synchronous rectification module 101 through the first driving signal and the second driving signal to form feedback control; therefore, the signal modulation module 106 in this embodiment can generate a required PWM wave, so that the compensation signal output by the synchronous rectification module 101 can perform inverse compensation on the interference ripple in the power supply 20, thereby ensuring the stability of the output power of the power supply 20.
In the irregular ripple active compensation circuit 10 provided in this embodiment, the first sampling module 102 can detect the working state of the synchronous rectification module 101 in real time, and feed back and adjust the working state of the synchronous rectification module 101 according to the compensation signal, so that the compensation ripple in the output compensation signal approaches the interference ripple in the power supply 20, the synchronous rectification module 101 rectifies the electric energy of the dc power supply 30 into a compensation signal with a polarity opposite to that of the interference ripple, and the compensation ripple in the compensation signal can completely filter the interference ripple in the power supply 20, thereby ensuring the stability of the power supply 20; therefore, the present embodiment can accurately collect real ac ripple information in the power supply 20 in real time through the irregular ripple compensation circuit 10, and dynamically feed back the compensation ripple after processing and analyzing the ac ripple information. The irregular ripple compensation circuit 10 has a good control effect and controls the response speed quickly, so that on one hand, the precision and the quality of the power supply 20 are greatly improved, and the load can be ensured to be always connected with stable power supply electric energy so as to maintain a safe and stable working state; on the other hand, the problem that the high-frequency component of the power supply cannot be accurately sampled in the conventional technology, and particularly, a bus control strategy is easy to generate large current ripples, so that the voltage/current precision of the power supply output is low, an interference ripple signal in the power supply is easy to cause instability of a power system, and the power supply is difficult to universally apply is effectively solved.
As an optional implementation manner, the dc power supply 30 is a +500V dc power supply, and the operation parameter of the compensation signal can be output according to the requirement, and the dc power supply 30 can output the dc power to the synchronous rectification module 101.
As an alternative embodiment, the signal generating module 105 is a triangle wave generator; the triangular wave is used as a carrier signal, and is transmitted to the signal modulation module 106, so as to implement a corresponding signal modulation function. The signal modulation module 106 generates a first driving signal and a second driving signal with a circuit on-off control function, so that the irregularity compensating circuit 10 can effectively eliminate interference ripples in the power supply 20.
As an alternative embodiment, the interference ripple includes: medium-high frequency ripples and harmonics in the ac ripples of the power supply 20; the irregular ripple active compensation circuit 10 can collect ac ripple information in the power supply 20, and feed back and adjust the operating state of the synchronous rectification module 101 according to interference ripples in the ac ripple information; the compensation signal in this embodiment is only adjusted for the high-frequency ripple and the harmonic, and does not affect the effective value and the average value of the output current/voltage of the power supply 20; therefore, the irregular ripple active compensation circuit 10 can accurately control the power supply 20, the accuracy of the electric energy in the power supply 20 is improved, extra electric energy loss in the power supply 20 is avoided, so that the electric energy output by the power supply 20 has better stability, and the irregular ripple active compensation circuit 10 can realize better feedback control of the performance of the power supply 20.
As an alternative embodiment, in the irregular ripple active compensation circuit 10, the first sampling module 102 and the signal modulation module 106 may be implemented by using a circuit structure in the conventional technology or a chip in the conventional technology, which is not limited herein; illustratively, the signal modulation module 106 can be implemented by using a PWM modulation circuit in the conventional art, and the irregular active compensation circuit 10 has a very simplified circuit structure.
As an alternative implementation, fig. 2 shows another module structure of the irregular ripple active compensation circuit 10 provided in this embodiment, and compared with the module structure of the irregular ripple active compensation circuit 10 in fig. 1, the irregular ripple active compensation circuit 10 in fig. 2 further includes: a filtering module 201.
The filtering module 201 is connected between the second sampling module 103 and the ripple processing module 104, and the filtering module 201 performs high-pass filtering on the ac ripple.
As described above, when the second sampling module 103 collects the ac ripple of the power supply 20, the ac ripple includes a high-frequency ripple, a harmonic, a low-frequency ripple, and a dc component, and the low-frequency ripple and the dc component in the ac ripple will interfere with the control performance of the irregular active compensation circuit 10, so that the compensation signal output by the synchronous rectification module 101 affects the effective value and the average value output by the power supply 20; therefore, in the present embodiment, the filtering module 201 blocks the low-frequency ripple and the dc component in the ac ripple, and the filtering module 201 can completely output the high-frequency ripple in the ac ripple, so as to ensure that the compensation signal output by the synchronous rectification module 101 is only controlled for the high-frequency component of the ac ripple in the power supply 20; when the synchronous rectification module 101 outputs the compensation signal, the compensation ripple in the compensation signal is used to perform inverse compensation on the interference ripple, so that the low-frequency component and the direct-current component in the power supply 20 are not affected, and the medium-high-frequency ripple and the harmonic in the alternating-current ripple of the power supply 20 are completely eliminated.
As an alternative implementation, fig. 3 shows another module structure of the irregular ripple active compensation circuit 10 provided in this embodiment, compared with the module structure of the irregular ripple active compensation circuit 10 in fig. 1, in fig. 3, the ripple processing module 104 includes: a first signal amplifier 1041, a second signal amplifier 1042, an adder 1043, and an inverting integrator 1044.
The first signal amplifier 1041 is connected to the first sampling module 102, the first sampling module 102 outputs the current sampling signal to the first signal amplifier 1041, the first signal amplifier 1041 performs proportional amplification on the current sampling signal, and the ripple processing module 104 can accurately acquire the working state of the synchronous rectification module 101.
The second signal amplifier 1042 is connected to the second sampling module 103, the second sampling module 103 outputs the ac ripple of the power supply 20 to the second signal amplifier 1042, the second signal amplifier 1042 amplifies the ac ripple of the power supply 20 in proportion, and the ripple processing module 104 can obtain the high-frequency ripple information in the power supply 20.
Therefore, in the present embodiment, the compensation ripple signal and the ac ripple signal are respectively amplified in proportion by the first signal amplifier 1041 and the second signal amplifier 1042, so as to ensure the signal transmission efficiency and the signal transmission quality of the compensation ripple signal and the ac ripple signal in the irregular ripple active compensation circuit 10; optionally, the first signal amplifier 1041 and the second signal amplifier 1042 have different proportional amplification coefficients, and the corresponding proportional amplification coefficients can be adjusted according to actual needs, and perform feedback control on the synchronous rectification module 101 according to the current sampling signal and the ac ripple of the power supply 20, so as to improve the accuracy of the irregular active ripple compensation circuit 10 in adjusting the interference ripple in the power supply 20, so that the electric energy output by the power supply 20 has higher stability.
The adder 1043 is connected to the first signal amplifier 1041 and the second signal amplifier 1042, the first signal amplifier 1041 outputs the proportionally amplified current sampling signal to the adder 1043, the second signal amplifier 1042 outputs the proportionally amplified ac ripple of the power supply 20 to the adder 1043, and the adder 1043 adds the proportionally amplified current sampling signal and the proportionally amplified ac ripple to obtain a first ripple signal.
It should be noted that, the adder 1043 performs vector superposition on the current sampling signal and the ac ripple, and since the current sampling signal and the ac ripple have different sizes and directions, respectively, after vector summation operation, the first ripple signal has different phases, and the first ripple signal can drive the irregular ripple active compensation circuit 10 to realize different interference ripple anti-compensation functions, so that the compatibility of the irregular ripple active compensation circuit 10 in this embodiment is improved; therefore, in the present embodiment, the ripple processing module 104 can synchronously change the phase of the compensation signal according to the operating state of the synchronous rectification module 101 and the ac ripple information in the power supply 20, so as to improve the dynamic feedback accuracy of the irregular active compensation circuit 10.
The inverse integrator 1044 is connected between the adder 1043 and the signal modulation module 106, and the inverse integrator 1044 performs inverse integration on the first ripple signal.
The inverting integrator 1044 can adjust the offset voltage/offset current in the first ripple signal to perform integral compensation on the first ripple signal, so as to improve the control accuracy of the first ripple signal, and can accurately acquire the electric energy fluctuation information in the compensation ripple output by the synchronous rectification module 101 and the interference ripple information of the power supply 20 through the first ripple signal, and can improve the feedback control efficiency of the irregular ripple active compensation circuit 10 through the first ripple signal; when the signal modulation module 106 receives the first ripple signal, the signal modulation module 106 can generate a corresponding first driving signal and a corresponding second driving signal, and the feedback control on the synchronous rectification module 101 can be realized through the first driving signal and the second driving signal, so that the synchronous rectification module 101 outputs a compensation signal having a completely opposite polarity to the interference ripple of the power supply 20, and the stability of the electric energy output by the power supply 20 is improved.
Therefore, in the ripple processing module 104 shown in fig. 3, the ripple processing module 104 includes four circuit units (the first signal amplifier 1041, the second signal amplifier 1042, the adder 1043, and the inverse integrator 1044), and after the ripple processing module 104 analyzes and processes the ac ripple and the compensation ripple signal, the transmission quality and the control performance of the first ripple signal are improved, so as to drive the irregular ripple active compensation circuit 10 to implement accurate dynamic feedback control; the synchronous rectification module 101 generates a compensation signal according to the ac ripple information in the power supply 20, and the compensation ripple in the compensation signal can filter the interference ripple in the power supply 20, so that the irregular ripple active compensation circuit 10 has better control performance.
As an alternative implementation, fig. 4 shows another module structure of the irregular ripple active compensation circuit 10 provided in this embodiment, and compared with the module structure of the irregular ripple active compensation circuit 10 in fig. 1, the irregular ripple active compensation circuit 10 in fig. 4 further includes: a first PWM (Pulse width modulation) driving circuit 401 and a second PWM driving circuit 402.
The first PWM driving circuit 401 is connected between the signal modulation module 106 and the synchronous rectification module 101, and the first PWM driving circuit 401 performs PWM rectification on the first driving signal.
The second PWM driving circuit 402 is connected between the signal modulation module 106 and the synchronous rectification module 101, and the second PWM driving circuit 402 performs PWM rectification on the second driving signal.
As described above, the first driving signal and the second driving signal can implement circuit on-off control, so that the synchronous rectification module 101 can implement the function of electric energy conversion, and the irregular ripple active compensation circuit 10 is in a stable working state; the PWM driving circuit (including the first PWM driving circuit 401 and the second PWM driving circuit 402) performs pulse width modulation on the driving signals and outputs the driving signals, so that the first driving signal and the second driving signal after PWM rectification have complementary amplitude and pulse width, and the first driving signal and the second driving signal are prevented from being interfered by external noise in the transmission process to cause control errors; when the control end of the synchronous rectification module 101 is connected to the first driving signal and the second driving signal which are complementary to each other in an isolated manner, the synchronous rectification module 101 realizes a corresponding electric energy conversion function according to the driving signals (including the first driving signal and the second driving signal), and the synchronous rectification module 101 can more accurately generate a compensation signal so as to realize an anti-compensation effect of interference ripples of the power supply 20; therefore, in the embodiment, the synchronous rectification module 101 can be accurately controlled in real time through the first PWM driving circuit 401 and the second PWM driving circuit 402, and the design of a precise power supply is realized.
It should be noted that, in fig. 2, fig. 3 and fig. 4, the filtering module 201, the first signal amplifier 1041, the second signal amplifier 1042, the adder 1043, the inverse integrator 1044, the first PWM driving circuit 401 and the second PWM driving circuit 402 may all be implemented by using a circuit structure in the conventional technology or a chip in the conventional technology, which is not limited to this; illustratively, the first signal amplifier 1041 may be implemented by a signal amplifying circuit in the conventional art, wherein the signal amplifying circuit includes: the current sampling circuit comprises an operational amplifier, a resistor and other electronic components, wherein the operational amplifier is used for carrying out accurate proportional amplification on a current sampling signal, and different amplification times are realized on the current sampling signal through the signal amplification circuit by changing the open-loop gain of the signal amplification circuit; therefore, the irregular active compensation circuit 10 in the present embodiment has control compatibility.
As an alternative implementation, fig. 5 shows another module structure of the irregular ripple active compensation circuit 10 provided in this embodiment, and compared with the module structure of the irregular ripple active compensation circuit 10 in fig. 1, in fig. 5, the synchronous rectification module 101 includes: the common mode rejection unit 501, the first switch unit 502, the second switch unit 503, the differentiation unit 504 and the isolation unit 505.
The power input end of the common mode rejection unit 501 is connected to the dc power supply 30, and the common mode rejection unit 501 performs common mode signal rejection on the electric energy of the dc power supply 30.
In this embodiment, when the dc power supply 30 outputs stable dc power to the common mode rejection unit 501, the common mode rejection unit 501 rejects the common mode signal, so that the compensation signal output by the synchronous rectification module 101 has a polarity opposite to that of the interference ripple, and the inverse compensation capability of the compensation signal for the interference signal in the power supply 20 is improved; and the common mode rejection ratio of the common mode rejection unit 501 can be adjusted correspondingly according to the actual needs of the technicians, so that the application range of the irregular ripple active compensation circuit 10 is widened.
A control terminal of the first switch unit 502 is connected to a first driving signal, a first on terminal of the first switch unit 502 is connected to a first power output terminal of the common mode rejection unit 501, and the first switch unit 502 is turned on or turned off according to the first driving signal.
When the first power output end of the common mode rejection unit 501 outputs the direct current power, the on or off state of the first switch unit 502 can be changed by the level state of the first driving signal; if the first switch unit 502 is in different on or off states, the first switch unit 502 can implement a voltage/current conversion function to change the polarity of the electric energy.
A control terminal of the second switching unit 503 is connected to a second driving signal, a second conducting terminal of the second switching unit 503 is connected to a second power output terminal of the common mode rejection unit 501, and the second switching unit 503 is turned on or turned off according to the second driving signal.
The second conducting terminal of the first switch unit 502 and the first conducting terminal of the second switch unit 503 are connected in common to output the first ac signal.
The control end of the second switch unit 503 is connected to the second driving signal output end of the signal modulation module 106, the signal modulation module 106 outputs the second driving signal to the control end of the second switch unit 503, and the on or off state of the second switch unit 503 can be changed through the level state of the second driving signal; when the second switch unit 503 is in different on or off states, the synchronous rectification module 101 is driven to implement a corresponding power supply synchronous rectification function.
In this embodiment, the signal modulation module 106 outputs a first driving signal and a second driving signal which are complementary to each other in isolation, the first switching unit 502 and the second switching unit 503 are respectively connected to the first driving signal and the second driving signal, the on or off states of the first switching unit 502 and the second switching unit 503 can be respectively changed by the first driving signal and the second driving signal, and the first switching unit 502 and the second switching unit 503 are mutually matched to be turned on, so that the second on terminal of the first switching unit 502 and the first on terminal of the second switching unit 503 can output first ac signals with different phases, and the first ac signals can change the operating state of the synchronous rectification module 101; the synchronous rectification module 101 can realize different rectification functions to make the irregular ripple active compensation circuit 10 output corresponding compensation signals, and the interference ripple of the power supply 20 can be eliminated through the compensation signals, so that the operation is simple and convenient, the control response speed of the irregular ripple active compensation circuit 10 is increased, and the anti-compensation function of the interference ripple in the power supply 20 is realized.
One end of the differentiating unit 504 is connected to the second conducting end of the first switching unit 502 and the first conducting end of the second conducting unit 503, the other end of the differentiating unit 504 is connected to the first sampling module 102, and the differentiating unit 504 differentiates and outputs the first ac signal.
The differentiating unit 504 can differentiate the ac signal, so that the differentiating unit 504 can improve the stability of the compensation ripple output by the synchronous rectification module 101, and the compensation ripple in the compensation signal can completely filter the interference ripple in the power supply 20; meanwhile, when the first sampling module 102 collects the compensation signal output by the synchronous rectification module 101, the first sampling module 102 can obtain the working state of the synchronous rectification module 101 according to the compensation signal, so that the feedback control of the synchronous rectification module 101 is realized, the stable control performance of the irregular ripple active compensation circuit 10 is ensured, and the voltage precision/current precision of the power supply 20 can be greatly improved through the compensation signal.
The isolation unit 505 is connected to the other end of the differentiation unit 504, and the isolation unit 505 filters the differentiated first ac signal to remove a dc component and a low-frequency ac component, so as to output the compensation signal.
Wherein, the isolation unit 505 has a function of high-pass filtering; after the differentiating unit 504 outputs the differentiated first ac signal to the isolating unit 505, the isolating unit 505 retains the high-frequency component in the first ac signal, so that the compensation signal output by the synchronous rectification module 101 only contains the high-frequency component, the precision of the compensation signal is improved, and the noise in the compensation signal is prevented from interfering with the control performance of the irregular ripple active compensation circuit 10, that is, it is ensured that the compensation signal only performs inverse compensation on the interference ripple in the power supply 20, and the effective value and the average value of the current output by the power supply 20 are not affected; the irregular ripple active compensation circuit 10 has a wider application range and higher practical value; therefore, the synchronous rectification module 101 in this embodiment has a relatively simplified circuit module structure, the synchronous rectification capability of the synchronous rectification module 101 is ensured, and the synchronous rectification module 101 can realize adaptive feedback control; when the synchronous rectification module 101 stably outputs the compensation ripple, the interference ripple of the power supply 20 can be eliminated in real time through the compensation ripple, so that the filtering effect of the high-frequency component and the harmonic component in the power supply 20 is achieved, and the electric energy output by the power supply 20 has better stability.
As an alternative implementation, fig. 6 shows a circuit structure of the synchronous rectification module 101 provided in this embodiment, as shown in fig. 6, the common mode rejection unit 501 includes a common mode inductor T1, the common mode inductor T1 can achieve rejection of a common mode signal in the electric energy, and does not change the electric property of the dc electric energy output by the dc power supply 30, so that the synchronous rectification module 101 can be in a safe and stable operating state, and compatibility and universality of the irregular active compensation power 10 in this embodiment are improved.
The first switch unit 502 comprises a first switch tube M1 and a first diode D1; the second switching unit 503 includes a second switching tube M1 and a second diode D2; when the first switch tube M1 is connected with a first driving signal, the second switch tube M2 is connected with a second driving signal; the on or off state of the first switch tube M1 can be changed by the first driving signal, and the on or off state of the second switch tube M2 can be changed by the second driving signal, wherein the first diode D1 and the second diode D2 have a freewheeling function, so that the physical safety of the first switch tube M1 and the second switch tube M2 is guaranteed; therefore, in this embodiment, the first switch unit 502 and the second switch unit 503 have relatively simplified circuit structures, and have extremely strong compatibility, and the control efficiency of the irregular ripple active compensation circuit 10 is ensured, the synchronous rectification module 101 realizes adaptive feedback control according to the first driving signal and the second driving signal, and can accurately filter the interference ripple of the power supply 20 through the compensation ripple in the compensation signal, so that the control performance is excellent.
The differentiating unit 504 includes: at least two inductors connected in series; the inductor is connected into the first alternating current signal, and the inductor can realize a differential effect on electric energy by utilizing a magnetic field induction phenomenon of the inductor; in this embodiment, the differentiating unit 504 can improve the inverse compensation accuracy of the compensation signal by using a plurality of inductors, the first sampling module 102 can stably collect the compensation signal output by the synchronous rectification module 101, and the control response speed of the irregular ripple active compensation circuit 10 is improved, and the irregular ripple active compensation circuit 10 can effectively eliminate the interference ripple of the power supply 20 through the compensation ripple in the compensation signal.
The isolation unit 505 comprises a plurality of capacitors connected in parallel, wherein the capacitors can play a role of isolating direct current and alternating current, the isolation unit 505 ensures the precision of high-pass filtering by using the plurality of capacitors, the compatibility is strong, and the single device fault is avoided; when the isolation unit 505 outputs the compensation ripple, the compensation ripple can improve the inverse compensation accuracy of the high-frequency component and the harmonic component in the power supply 20, so that the power supply 20 can be widely applied to different industrial fields.
As an alternative implementation, as shown in fig. 6, in the common mode rejection unit 501, the synonym terminal of the common mode inductor T1 is connected to the dc power supply 30, and the synonym terminal of the common mode inductor T1 is the power output terminals (the first power output terminal and the second power output terminal) of the common mode rejection unit 501, and the common mode rejection unit 501 in this embodiment can reject the common mode signal and does not change the electrical performance output by the dc power supply 30; in the first switch unit 502, a control electrode of the first switch tube M1 is connected to the signal modulation module 106, a first conducting electrode of the first switch tube M1 and a cathode of the first diode D1 are connected to a first power output end of the common mode rejection unit 501 in common, a second conducting electrode of the first switch tube M1 and an anode of the first diode D1 are connected in common to form a second conducting end of the first switch unit 502, an on or off state of the first switch tube M1 can be changed by a level state of the first driving signal, and when the first conducting electrode and the second conducting electrode of the first switch tube M1 are connected, a corresponding first ac signal can be output by the second conducting end of the first switch unit 502 to drive the synchronous rectification module 101 to realize a corresponding power conversion function; in the circuit structure of the second switch unit 503, a control electrode of the second switch tube M2 is connected to the signal modulation module 106, the signal modulation module 106 outputs the second driving signal to a control electrode of the second switch tube M2, a first conducting electrode of the second switch tube M2 and a cathode of the second diode D2 are connected in common to form a first conducting end of the second switch unit 503, a second conducting electrode of the second switch tube M2 and an anode of the second diode D2 are connected in common to a second power output end of the common mode suppression unit 501, a conducting or a breaking state of the second switch tube M2 can be changed in real time according to a level state of the second driving signal, when the second switch tube M2 is conducting, the electric energy output by the common mode suppression unit 501 sequentially passes through the second conducting electrode of the second switch tube M2 and the first conducting electrode of the second switch tube M2, and the first switch tube M1 and the second switch tube M2 are sequentially conducted in an interleaved manner. The first switching unit 502 and the second switching unit 503 are complementarily turned on so that the synchronous rectification module 101 has a faster dynamic response.
As an optional implementation, the first switch transistor M1 is an MOS transistor, the second switch transistor M2 is an MOS transistor, and other power switch transistors such as an IGBT (Insulated Gate bipolar transistor) may also be used; therefore, the synchronous rectification module 101 in the present embodiment has good control compatibility.
Illustratively, the differentiating unit 504 includes: a first inductor L1 and a second inductor L2, wherein a first end of the first inductor L1 is connected to a second conducting end of the first switching unit 502 and a first conducting end of the second switching unit 503, a second end of the first inductor L1 is connected to a first end of the second inductor L2, and a second end of the second inductor L2 is connected to the first sampling module 102 and the isolation unit 505, so that the first ac signal can be differentiated through the first inductor L1 and the second inductor L2, and the operation is simple and convenient, the manufacturing cost and the application cost of the irregular ripple active compensation circuit 10 are lower, and the dynamic feedback control of the irregular ripple active compensation circuit 10 is realized; optionally, the synchronous rectification module 101 further includes a capacitor CS1, wherein a first end of the capacitor CS1 is connected to the second end of the first inductor L1 and the first end of the second inductor L2, a second end of the capacitor CS1 is connected to the second power output end of the common mode rejection unit 501, and the capacitor CS1 can perform voltage stabilization and overvoltage prevention functions in the synchronous rectification module 101, so as to ensure safe and stable operation of the synchronous rectification module 101.
In this embodiment, the synchronous rectification operation of the electric energy is realized through the simplified synchronous rectification module 101, the controllability of the synchronous rectification module 101 is strong, and the synchronous rectification module 101 generates a corresponding compensation ripple according to the high-frequency component and the harmonic component of the ac ripple in the power supply 20, so that the compensation ripple realizes an accurate inverse compensation effect on the interference ripple of the power supply 20, and the accuracy and the stability of the power supply 20 are ensured; the irregular ripple active compensation circuit 10 in this embodiment can be widely applied to different industrial fields, and has a very wide application range.
Fig. 7 shows an implementation flow of the irregular ripple active compensation method provided in this embodiment, where the irregular ripple active compensation method is applied to a power supply, and collects real ac ripples of the power supply to adjust interference ripples in the power supply, so as to improve the precision of the power supply, and thus the power supply in this embodiment has a higher practical value; as shown in fig. 7, the irregular ripple active compensation method specifically includes:
step S701: providing a direct current power supply, and synchronously rectifying the direct current power supply to load a compensation signal to the output of the power supply; the first compensation signal can change the state of alternating current ripples in the power supply, and the adjusting function of the power supply for outputting electric energy is realized.
Step S702: sampling the output of a power supply to obtain an alternating current ripple comprising interference ripples; the alternating current ripple in the power supply contains various electric energy components, the actual alternating current ripple information in the power supply can be accurately obtained through interference ripple, and the alternating current ripple has extremely high sampling precision.
Step S703: sampling the compensation signal to obtain a current sampling signal; the synchronous rectification process of the dc power supply in step S701 can be monitored in real time according to the current sampling signal.
Step S704: processing the alternating current ripple and the current sampling signal to obtain a first ripple signal; can obtain DC power supply's synchronous rectification effect and the alternating current ripple information among the power supply synthetically through this first ripple signal to the realization is controlled to the accuracy of alternating current ripple among the power supply.
Step S705: accessing a triangular wave signal and a first ripple signal for modulation to obtain two complementary isolated driving signals; when the two driving signals have different level states, the irregular ripple active compensation method in this embodiment can implement a corresponding compensation function for the power supply, and improve controllability of ac ripples in the power supply.
Step S706: the DC power supply is regulated by utilizing two complementary isolated driving signals, so that the polarities of compensation signals and interference ripples are opposite; the feedback control of the power supply is realized through two complementary isolated driving signals, and because the polarities of the compensation signal and the interference ripple are opposite, the anti-compensation function of the interference ripple can be realized through the compensation ripple in the compensation signal, so that the interference ripple in the output electric energy of the power supply is completely inhibited, and the precision of the power supply is improved.
It should be noted that the irregular ripple active compensation method in fig. 7 corresponds to the irregular ripple active compensation circuit 10 in fig. 1, and for each specific step in the irregular ripple active compensation method in this embodiment, reference may be made to the embodiments in fig. 1 to 6, which will not be described again here.
In the irregular ripple active compensation method shown in fig. 7, by sampling and monitoring the synchronous rectification process of the dc power supply in real time, a driving signal is obtained according to the ac ripple and the current sampling signal, wherein the level state of the driving signal has a contrast relationship with the actual ac ripple information of the power supply, and the synchronous rectification operation of the dc power supply is adjusted according to the driving signal to form feedback control, so that the interference ripple in the power supply can be accurately eliminated by the compensation signal, the control accuracy is very high, the power supply can output more stable electric energy, and the quality of the power supply is improved; therefore, the irregular ripple active compensation method in the embodiment can perform feedback control on alternating current ripples in the power supply, eliminate interference ripples in the power supply in real time, has higher loudness speed, improves the current sampling precision, and has extremely high practical value; the problem that the power supply cannot be universally applied due to the fact that irregular ripples of the power supply cannot be accurately sampled and subjected to inverse compensation, the stability of the power supply is low, and the accuracy of voltage/current output by the power supply is low in the conventional technology is effectively solved.
Fig. 8 shows a module structure of the power supply system 80 provided in the present embodiment, and as shown in fig. 8, the power supply system 80 includes: the power supply 801, the direct current power supply 802 and the irregular ripple active compensation circuit 10, wherein the irregular ripple active compensation circuit 10 is connected with the power supply 801 and the direct current power supply 802.
The irregular ripple active compensation circuit 10 adjusts the dc power supply 802, so that the dc power supply 802 outputs a compensation signal with a polarity opposite to that of the interference ripple in the power supply 801, and the interference ripple in the power supply 801 is inversely compensated by the compensation signal.
Since the power supply system 80 in fig. 8 corresponds to the irregular ripple active compensation circuit 10 in fig. 1, reference may be made to a specific embodiment of the irregular ripple active compensation circuit 10 in fig. 1 for a specific operation principle of the power supply system 80 in fig. 8, and details thereof will not be repeated here.
The irregular ripple active compensation circuit 10 can adjust the dc power supply 802 according to the ac ripple information in the power supply 801, so that the compensation signal output by the dc power supply 802 performs inverse compensation on the interference ripple in the power supply 801, the interference ripple in the power supply 801 is eliminated, the electric energy output by the power supply 801 has better stability, the control response speed of the power supply 801 is faster, and the accuracy and quality of the power supply 801 are improved; therefore, the power supply system 80 in the embodiment can output electric energy with higher quality, and the power supply system 80 can be suitable for loads of different types, so that the loads are in a rated working state for a long time, and the practical value and universality of the power supply system 80 are improved; the problems that interference signals are too large, the electric energy precision in a power supply system is low, the power supply system is unstable, the power supply system cannot be applied to loads of different types, and the practical value is not high in the traditional power supply system are effectively solved.
In summary, the irregular ripple active compensation circuit 10 in the embodiment of the present invention can perform feedback control on the working process of the synchronous rectification module according to the ac ripple in the power supply, so that the compensation signal output by the synchronous rectification module performs inverse compensation on the interference ripple in the power supply, thereby improving the accuracy of the power output by the power supply and enabling the power output by the power supply to have higher quality; the irregular ripple active compensation circuit 10 has extremely fast control response speed to the power supply, reduces the electric energy loss of the power supply, and improves the power supply efficiency of the power supply; furthermore, the irregular ripple active compensation circuit 10 in the embodiment of the present invention can be widely applied to various fields such as the design of a precision power supply, filter compensation, and battery detection, and has a very wide application range, thereby playing a positive role in promoting the development of the power technology.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An irregular ripple active compensation circuit, which is connected with a power supply, wherein the irregular ripple active compensation circuit comprises:
the power supply comprises a power supply input end, a synchronous rectification module, a first driving signal, a second driving signal and a compensation signal, wherein the power supply input end is connected with a direct-current power supply, is connected with the first driving signal and the second driving signal, and is configured to output the compensation signal with the polarity opposite to that of interference ripples in the power supply after synchronously rectifying electric energy of the direct-current power supply according to the first driving signal and the second driving signal;
the first sampling module is connected with the synchronous rectification module and is configured to sample the compensation signal to obtain a current sampling signal;
the second sampling module is connected with the power supply and is configured to collect alternating current ripples of the power supply;
the ripple processing module is connected with the first sampling module and the second sampling module and configured to process the alternating current ripple and the current sampling signal to obtain a first ripple signal;
a signal generation module configured to generate a triangular wave signal; and
and the signal modulation module is connected with the ripple processing module, the signal generation module and the synchronous rectification module and is configured to modulate the first ripple signal and the triangular wave signal to generate two complementary paths of the first driving signal and the second driving signal.
2. The irregular ripple active compensation circuit of claim 1, wherein the interference ripple comprises: and high-frequency ripples and harmonic waves in alternating current ripples of the power supply.
3. The irregular ripple active compensation circuit of claim 1, further comprising:
and the filtering module is connected between the second sampling module and the ripple processing module and is configured to carry out high-pass filtering on the alternating current ripple.
4. The irregular ripple active compensation circuit of claim 1, wherein the ripple processing module comprises:
a first signal amplifier connected to the first sampling module and configured to scale the current sampling signal;
the second signal amplifier is connected with the second sampling module and is configured to amplify the alternating current ripple of the power supply in proportion;
the adder is connected with the first signal amplifier and the second signal amplifier and is configured to add the proportional amplified current sampling signal and the proportional amplified alternating current ripple to obtain a first ripple signal; and
an inverting integrator connected between the adder and the signal modulation module and configured to invert the first ripple signal.
5. The irregular ripple active compensation circuit of claim 1, further comprising:
a first PWM driving circuit connected between the signal modulation module and the synchronous rectification module and configured to PWM rectify the first driving signal;
and the second PWM driving circuit is connected between the signal modulation module and the synchronous rectification module and is configured to perform PWM rectification on the second driving signal.
6. The irregular ripple active compensation circuit of claim 1, wherein the synchronous rectification module comprises:
the power supply input end is connected with the direct-current power supply, and the common mode rejection unit is configured to carry out common mode signal rejection on electric energy of the direct-current power supply;
the control end is connected with the first driving signal, the first conducting end is connected with the first power output end of the common mode rejection unit, and the first switching unit is configured to be switched on or switched off according to the first driving signal;
the control end is connected with the second driving signal, the second conducting end is connected with the second power output end of the common mode rejection unit, and the second switching unit is configured to be switched on or switched off according to the second driving signal;
the second conducting end of the first switch unit and the first conducting end of the second switch unit are connected in common to output a first alternating current signal;
the first sampling module is configured to receive the first alternating current signal, and the second sampling module is configured to sample the first alternating current signal; and
and the isolation unit is connected with the other end of the differential unit and is configured to filter a direct current component and a low-frequency alternating current component of the differentiated first alternating current signal so as to output the compensation signal.
7. The irregular ripple active compensation circuit of claim 6, wherein the common mode rejection unit comprises: a common mode inductor;
the first switching unit includes: the first switch tube and the first diode;
the second switching unit includes: a second switch tube and a second diode;
the differentiation unit includes: at least two inductors connected in series;
the isolation unit includes: a plurality of capacitors connected in parallel.
8. The irregular ripple active compensation circuit of claim 7, wherein the first switch tube is a MOS tube or an IGBT, and the second switch tube is a MOS tube or an IGBT.
9. An irregular ripple active compensation method is applied to a power supply, and is characterized by comprising the following steps:
providing a direct current power supply, and synchronously rectifying the direct current power supply to load a compensation signal to the output of the power supply;
sampling the output of the power supply to obtain an alternating current ripple comprising interference ripples;
sampling the compensation signal to obtain a current sampling signal;
processing the alternating current ripple and the current sampling signal to obtain a first ripple signal;
accessing a triangular wave signal and the first ripple signal for modulation to obtain two complementary isolated driving signals;
and adjusting the direct-current power supply by utilizing two complementary isolated driving signals to enable the compensation signal and the interference ripple to have opposite polarities.
10. A power supply system, comprising:
a power supply, a dc power supply, and the irregular ripple active compensation circuit of any one of claims 1-8, the irregular ripple active compensation circuit coupled to the power supply and the dc power supply;
the irregular ripple active compensation circuit adjusts the direct current power supply so that the direct current power supply outputs a compensation signal with the polarity opposite to that of interference ripples in the power supply, and the interference ripples in the power supply are inversely compensated through the compensation signal.
CN201811487295.4A 2018-12-06 2018-12-06 Irregular ripple active compensation circuit, active compensation method and power supply system Pending CN111293866A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113281650A (en) * 2021-05-31 2021-08-20 东风汽车有限公司东风日产乘用车公司 Motor ripple signal sampling method and device
CN113541511A (en) * 2021-08-16 2021-10-22 阳光电源股份有限公司 Hydrogen production power supply and hydrogen production system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113281650A (en) * 2021-05-31 2021-08-20 东风汽车有限公司东风日产乘用车公司 Motor ripple signal sampling method and device
CN113541511A (en) * 2021-08-16 2021-10-22 阳光电源股份有限公司 Hydrogen production power supply and hydrogen production system

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