CN116582005B

CN116582005B - Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment

Info

Publication number: CN116582005B
Application number: CN202310416959.2A
Authority: CN
Inventors: 刘耿博; 史栋毅; 方飞; 曹彦哲; 郭建鑫; 赵永波
Original assignee: Xi'an Megmeet Electrical Co ltd; Shenzhen Megmeet Electrical Co Ltd
Current assignee: Xi'an Megmeet Electrical Co ltd; Shenzhen Megmeet Electrical Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-12-08
Anticipated expiration: 2043-04-18
Also published as: CN116582005A

Abstract

The application discloses an electric energy conversion circuit, an electric energy conversion method and an electric energy conversion device, wherein the electric energy conversion circuit comprises: the adjusting circuit receives the first to third phase voltage signals and the first to third phase current signals sent by the power supply source so as to adjust the first to third phase current signals into working voltage signals and provide the working voltage signals for the load circuit; the control circuit is used for sampling any two of the first to third phase voltage signals, the working voltage signals and the first to third phase current signals in the regulating circuit to calculate and obtain the other one of the first to third phase current signals, and generating control signals by using the first to third phase voltage signals, the working voltage signals and the first to third phase current signals to send the control signals to the regulating circuit so as to regulate the working voltage signals. Through the mode, the electric energy conversion circuit can meet the electric energy conversion requirement and simultaneously can effectively reduce the hardware configuration cost for current sampling.

Description

Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment

Technical Field

The present application relates to the field of power technologies, and in particular, to an electric energy conversion circuit, an electric energy conversion method, and an electric energy conversion device.

Background

With the development and application of power electronics technology, a large number of power electronics devices are connected to a power grid to provide power supply services for various loads, such as three-phase four-wire power conversion devices therein, are widely used.

However, the conventional three-phase four-wire system power conversion device generally adopts three hall chips or three current splitters to sample the input current of the power grid, so that the hardware cost required to be correspondingly configured is generally high.

Disclosure of Invention

The application mainly solves the technical problem of providing an electric energy conversion circuit, an electric energy conversion method and electric energy conversion equipment, and can solve the problem that the hardware cost of an electric energy conversion device in the prior art is usually higher.

In order to solve the technical problems, the application adopts a technical scheme that: there is provided a power conversion circuit, wherein the power conversion circuit includes: the adjusting circuit is coupled with an external power supply and the load circuit, is used for receiving the first to third phase voltage signals and the first to third phase current signals sent by the power supply, and is used for adjusting the first to third phase current signals into working voltage signals so as to be provided for the load circuit; the first to third phase current signals meet a set functional relation; the control circuit is coupled with the regulating circuit to sample and obtain any two of the first to third phase voltage signals, the working voltage signals and the first to third phase current signals in the regulating circuit, calculate and obtain the other one of the first to third phase current signals according to a set functional relation, and generate a control signal by utilizing the first to third phase voltage signals, the working voltage signals and the first to third phase current signals so as to send the control signal to the regulating circuit, so that the regulating circuit changes the conducting state under the action of the control signal to regulate the working voltage signals.

The electric energy conversion circuit further comprises a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit is coupled with the adjusting circuit and the control circuit and used for receiving the first to third phase voltage signals and the working voltage signals sent by the adjusting circuit so as to respectively adjust the first to third phase voltage signals and the working voltage signals into first to third voltage sampling signals and the working voltage sampling signals; the current sampling circuit is coupled with the adjusting circuit and the control circuit to receive any two of the first to third phase current signals and adjust the received any two of the first to third phase current signals into first to second current sampling signals; the control circuit receives the first to third voltage sampling signals and the working voltage sampling signals sent by the voltage sampling circuit and the first to second current sampling signals sent by the current sampling circuit, calculates and obtains a third current sampling signal corresponding to the other one of the first to third current signals according to a set functional relation, and generates a control signal by using the first to third voltage sampling signals, the working voltage sampling signals and the first to third current sampling signals.

The adjusting circuit comprises first to third power supply line connecting ends, the first to third power supply line connecting ends are respectively coupled to the first to third power supply lines of the power supply source and grounded, the number of the current sampling circuits is two, each current sampling circuit comprises a current divider, a first isolation sub-circuit and an operational amplifier sub-circuit, the current divider is coupled with any one of the first to third power supply line connecting ends and the first isolation sub-circuit, the first isolation sub-circuit is coupled with the operational amplifier sub-circuit, and the operational amplifier sub-circuit is coupled with the control circuit; wherein, two shunts are coupled to any two of the first to third power supply line connection ends respectively.

The operational amplifier sub-circuit comprises first to fourth resistors, an operational amplifier, a first power supply and a second power supply, wherein the first end of the first resistor is connected with the first end of the first isolation sub-circuit, the second end of the first resistor is connected with the positive end of the operational amplifier and the first end of the third resistor, the second end of the third resistor is connected with the first power supply, the first end of the second resistor is connected with the second end of the first isolation sub-circuit, the second end of the second resistor is connected with the negative end of the operational amplifier and the first end of the fourth resistor, the second end of the fourth resistor is connected with the output end of the operational amplifier and the control circuit, and the power end of the operational amplifier is connected with the second power supply.

The control circuit comprises a signal processing circuit and a pulse width modulation circuit, the signal processing circuit is coupled with the voltage sampling circuit, the current sampling circuit and the pulse width modulation circuit, and the pulse width modulation circuit is coupled with the first switch sub-circuit to the third switch sub-circuit; the signal processing circuit receives first to third voltage sampling signals and working voltage sampling signals sent by the voltage sampling circuit and first to second current sampling signals sent by the current sampling circuit, calculates to obtain third current sampling signals according to a set functional relation, controls the pulse width modulation circuit to generate first to third pulse width modulation signals by using the first to third voltage sampling signals, the working voltage sampling signals and the first to third current sampling signals, and sends the first to third pulse width modulation signals to the first to third switch sub-circuits respectively, so that the first to third switch sub-circuits change the conducting state under the action of the first to third pulse width modulation signals respectively.

The control circuit further comprises a first filter circuit, the first filter circuit is coupled with the signal processing circuit, when the signal processing circuit detects that the working voltage sampling signal sent by the voltage sampling circuit is 0, the first filter circuit is connected with the current sampling circuit, so that the first filter circuit receives first to second current sampling signals sent by the current sampling circuit currently, and filters the current first to second current sampling signals to obtain first to second direct current components to be sent to the signal processing circuit; when the working voltage sampling signal is not 0, the signal processing circuit calculates a first current filtering signal to a second current filtering signal by utilizing the current first current sampling signal to the second current sampling signal and the first current component to the second current component, and calculates a third current sampling signal by utilizing the first current filtering signal to the second current filtering signal according to a set functional relation, so as to control the pulse width modulation circuit to generate a first pulse width modulation signal to a third pulse width modulation signal by utilizing the first voltage sampling signal to the third voltage sampling signal, the working voltage sampling signal, the first current filtering signal to the second current filtering signal and the third current sampling signal.

The control circuit further comprises a second filter circuit, the second filter circuit is coupled with the signal processing circuit, and when the signal processing circuit detects that the working voltage sampling signal sent by the voltage sampling circuit is not 0, the second filter circuit is connected with the current sampling circuit, so that the second filter circuit receives first to second current sampling signals sent by the current sampling circuit currently, filters the current first to second current sampling signals to obtain first to second low-frequency components, and sends the first to second low-frequency components to the signal processing circuit; the signal processing circuit calculates first to second current filtering signals by using the first to second low-frequency components and the first to second direct-current components.

The control circuit further comprises an analog-to-digital conversion circuit, the signal processing circuit is coupled with the voltage sampling circuit and the current sampling circuit through the analog-to-digital conversion circuit, the analog-to-digital conversion circuit receives first to third voltage sampling signals and working voltage sampling signals sent by the voltage sampling circuit, and first to second current sampling signals sent by the current sampling circuit, so that the first to third voltage sampling signals, the working voltage sampling signals and the first to second current sampling signals are respectively converted into first to third voltage digital signals, working voltage digital signals and first to second current digital signals, and the first to third voltage digital signals, the working voltage digital signals and the first to second current digital signals, and the first to third current digital signals are sent to the signal processing circuit, so that the signal processing circuit calculates a third current digital signal corresponding to the other one of the first to third current digital signals according to a set function relation, and the pulse width modulation circuit is controlled to generate first to third pulse width modulation signals by the first to third voltage digital signals, the working voltage digital signals and the first to third current digital signals.

The electric energy conversion circuit further comprises a driving circuit, wherein the driving circuit is coupled with the pulse width modulation circuit and the first to third switch sub-circuits, and is used for receiving the first to third pulse width modulation signals sent by the pulse width modulation circuit, respectively adjusting the first to third pulse width modulation signals into first to third driving signals, respectively sending the first to third driving signals to the first to third switch sub-circuits, and respectively enabling the first to third switch sub-circuits to change the conducting state under the action of the first to third driving signals.

The driving circuit comprises a power amplifier sub-circuit and a second isolation sub-circuit, the power amplifier sub-circuit is coupled with the pulse width modulation circuit and the second isolation sub-circuit, the second isolation sub-circuit is coupled with the first to third switch sub-circuits, and the power amplifier sub-circuit receives the first to third pulse width modulation signals sent by the pulse width modulation circuit, so that the first to third pulse width modulation signals are respectively power-amplified and adjusted to be first to third driving signals, and the first to third driving signals are respectively sent to the first to third switch sub-circuits through the second isolation sub-circuit.

The regulating circuit comprises a first power supply line connecting end, a third power supply line connecting end, a filtering energy storage sub-circuit, a rectifier sub-circuit, a first switch sub-circuit, a third switch sub-circuit and a voltage stabilizing output sub-circuit; the first to third power supply lines are respectively coupled to the first to third power supply lines of the power supply source and grounded, the filtering energy storage sub-circuit is coupled to the first to third power supply lines and the rectifier sub-circuit, the rectifier sub-circuit is coupled to the first to third switch sub-circuits, and the first to third switch sub-circuits are coupled to the voltage stabilizing output sub-circuit.

In order to solve the technical problems, the application adopts another technical scheme that: provided is an electric energy conversion method including: receiving first to third voltage signals and first to third current signals sent by an external power supply; the first to third phase current signals meet a set functional relation; regulating the first-third phase current signals into working voltage signals to be provided to a load circuit; calculating the other one of the first to third phase current signals according to a set functional relation by using any two of the first to third phase current signals; generating a control signal using the first to third phase voltage signals, the operating voltage signal, and the first to third phase current signals; the operating voltage signal is regulated by a control signal.

After the step of adjusting the first to third phase current signals to the operating voltage signals to be provided to the load circuit, the step of calculating the other one of the first to third phase current signals according to the set functional relationship by using any two of the first to third phase current signals, further includes: respectively adjusting the first to third phase voltage signals and the working voltage signals into first to third voltage sampling signals and working voltage sampling signals; adjusting any two of the first to third phase current signals to first to second current sampling signals; the step of calculating the other of the first to third phase current signals from the set functional relationship using any two of the first to third phase current signals includes: calculating a third current sampling signal corresponding to the other one of the first to third current signals by using the first to second current sampling signals according to a set functional relation; the step of generating the control signal using the first to third phase voltage signals, the operating voltage signals, and the first to third phase current signals includes: the control signal is generated using the first to third voltage sampling signals, the operating voltage sampling signal, and the first to third phase current sampling signals.

After the step of adjusting any two of the first to third phase current signals to be the first to second current sampling signals, the step of calculating a third current sampling signal corresponding to the other one of the first to third phase current signals according to a set functional relation by using the first to second current sampling signals further comprises: detecting whether an adjusting instruction sent by an upper computer is received or not; if the adjusting instruction is not received, filtering the current first current sampling signal to the current second current sampling signal to obtain first direct current components to second direct current components; if receiving an adjusting instruction, calculating to obtain first to second current filtering signals by using the current first to second current sampling signals and the first to second direct current components; the step of calculating a third current sampling signal corresponding to the other one of the first to third phase current signals by using the first to second current sampling signals according to a set functional relationship comprises the following steps: calculating a third current sampling signal according to a set functional relation by using the first current filtering signal to the second current filtering signal; the step of generating the control signal using the first to third voltage sampling signals, the operating voltage sampling signal, and the first to third phase current sampling signals includes: generating first to third pulse width modulation signals using the first to third voltage sampling signals, the operating voltage sampling signal, the first to second current filtering signals, and the third current sampling signal; the step of adjusting the operating voltage signal by the control signal comprises: the operating voltage signal is regulated by the first to third pulse width modulation signals.

Wherein, if receiving the adjustment command, the step of calculating the first to second current filtering signals by using the present first to second current sampling signals and the first to second direct current components comprises: if an adjusting instruction is received, filtering the current first current sampling signal to the current second current sampling signal to obtain first low-frequency components to second low-frequency components; the first to second current filtered signals are calculated using the first to second low frequency components and the first to second direct current components.

In order to solve the technical problems, the application adopts another technical scheme that: provided is an electric energy conversion device, wherein the electric energy conversion device comprises a housing and an electric energy conversion circuit connected to the housing; wherein the power conversion circuit is any one of the power conversion circuits described above.

The beneficial effects of the application are as follows: compared with the prior art, the regulating circuit in the electric energy conversion circuit provided by the application regulates the first to third phase current signals into the working voltage signals when receiving the first to third phase voltage signals and the first to third phase current signals sent by the power supply, so as to provide the working voltage signals for the load circuit, the control circuit samples any two of the first to third phase voltage signals, the working voltage signals and the first to third phase current signals in the regulating circuit, calculates the other one of the first to third phase current signals according to the set functional relation, and generates control signals by utilizing the first to third phase voltage signals, the working voltage signals and the first to third phase current signals, so that the control signals are sent to the regulating circuit, and therefore, the working voltage signals provided for the load circuit can be regulated on the premise of sampling the two-phase current signals, namely, the three-way current sampling sub-circuit is not required, and meanwhile, the hardware configuration cost for current sampling can be effectively reduced.

Drawings

For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

fig. 1 is a schematic diagram of a first embodiment of a power conversion circuit according to the present application;

FIG. 2 is a schematic diagram of a second embodiment of the power conversion circuit of the present application;

FIG. 3 is a schematic diagram of a third embodiment of the power conversion circuit of the present application;

FIG. 4 is a detailed schematic diagram of one embodiment of the regulation and control circuitry in the power conversion circuit of FIG. 3;

FIG. 5 is a detailed schematic diagram of an embodiment of a current sampling circuit in the power conversion circuit of FIG. 3;

FIG. 6 is a schematic diagram showing a detailed structure of an embodiment of a voltage sampling circuit in the power conversion circuit of FIG. 3;

FIG. 7 is a schematic flow chart of a first embodiment of the power conversion method of the present application;

FIG. 8 is a schematic flow chart of a second embodiment of the power conversion method of the present application;

FIG. 9 is a schematic flow chart of a third embodiment of the power conversion method of the present application;

FIG. 10 is a flowchart of an embodiment of S67 in FIG. 9;

fig. 11 is a schematic structural view of an embodiment of the power conversion apparatus of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.

The terms "first," "second," "third," and the like in this disclosure are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

The present application will be described in detail with reference to the drawings and embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a power conversion circuit according to a first embodiment of the application. In the present embodiment, the electric energy conversion circuit 10 includes: a regulating circuit 11 and a control circuit 12.

The electric energy conversion circuit 10 provided by the application is particularly applied to an electronic device needing electric energy conversion, such as an electric vehicle charging device or a communication power supply device, so as to obtain three-phase alternating current from a power grid, convert the three-phase alternating current into corresponding direct current and provide the corresponding direct current to an electric load. Of course, in other embodiments, the power conversion circuit 10 is specifically applied to any other electronic device that needs to convert three-phase ac power into dc power, such as aerospace, production, and manufacturing, and the like, and the present embodiment is not limited thereto.

Specifically, the adjusting circuit 11 is coupled to an external power supply 100, and correspondingly coupled to an external load circuit 200, so as to obtain power from the power supply 100, adjust the power, and provide the adjusted power to the load circuit 200.

The power supply 100 is specifically understood to be a power grid power supply that uses a three-phase four-wire system to supply three-phase alternating current to the adjusting circuit 11, that is, the first to third phase voltage signals and the first to third phase current signals are sent to the adjusting circuit 11, so that the first to third phase current signals are adjusted to working voltage signals by the adjusting circuit 11 and then provided to the load circuit 200 to drive the load circuit 200 to work.

It is worth to say that the three-phase alternating current specifically refers to a power system composed of three alternating current circuits with the same frequency, equal potential amplitude and 120-degree mutual phase difference angle. It is understood that the three-phase alternating current is a combination of three symmetrical sinusoidal alternating currents having a phase difference of 120 ° with respect to each other. It is produced by three sets of symmetrical windings of a three-phase generator, each winding together with its external circuit being called a phase, respectively denoted A, B, C. The combination of the three-phase system and the star-shaped system is called a three-phase system, and the three-phase system and the three-phase four-wire system are used for supplying power in a triangle connection method and a star connection method.

When the three-phase alternating current is provided by a three-phase four-wire system, the corresponding first to third phase current signals satisfy a set functional relation, that is, the sum of the first to third phase current signals is equal to 0, so that after any two of the first to third phase current signals are obtained, the other remaining one can be calculated according to the set functional relation.

In addition, "coupled" herein is meant to include any direct or indirect connection. Thus, if a first circuit is coupled to a second circuit, it is intended that the first circuit be directly connected to the second circuit by an electrical connection or a signal connection such as wireless transmission, optical transmission, or the like, or be indirectly connected to the second circuit electrically or by other circuits or connection means.

Further, the control circuit 12 is coupled to the adjusting circuit 11 to sample any two of the first to third phase voltage signals, the operating voltage signals and the first to third phase current signals from the adjusting circuit 11, so as to calculate the other one of the first to third phase current signals according to a set functional relationship by using any two of the obtained first to third phase current signals.

It can be understood that when the first to third phase voltage signals, the operating voltage signals and the first to third phase current signals are obtained, the control circuit 12 can adjust the operating voltage signals output to the load circuit 200 according to the current power supply state, that is, generate corresponding control signals by using the first to third phase voltage signals, the operating voltage signals and the first to third phase current signals, so as to send the control signals to the adjusting circuit 11, so that the adjusting circuit 11 changes the conducting state under the action of the control signals, for example, the control signals are used to adjust the conducting time of part of the lines in the adjusting circuit 11, and then the operating voltage signals output to the load circuit 200 are changed accordingly.

The control circuit 12 may specifically perform sampling and corresponding adjustment on each signal in the adjusting circuit 11 in real time, and may further perform real-time feedback adjustment by sampling the working voltage signal, so as to ensure that the working voltage signal correspondingly output to the load circuit 200 can be kept stable, thereby maintaining the load circuit 200 in a stable working state.

In the above scheme, any two of the first to third phase current signals in the adjusting circuit 11 are obtained through sampling, so that the other one of the first to third phase current signals is obtained through calculation according to the set functional relationship, and the adjustment of the working voltage signal output to the load circuit 200 is realized, so that the hardware configuration cost for current sampling can be effectively reduced while the electric energy conversion requirement is met on the premise of sampling the two-phase current signal, that is, on the premise of not configuring the three-way current sampling sub-circuit.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the power conversion circuit according to the present application. The power conversion circuit in this embodiment is different from the first embodiment of the power conversion circuit provided by the present application in that the power conversion circuit 20 specifically further includes a voltage sampling circuit 23 and a current sampling circuit 24.

It will be appreciated that since each voltage and current signal directly obtained from the power grid is a strong electric signal, but generally cannot be directly processed by a circuit composed of weak current devices having a signal processing function, it is generally also necessary to perform corresponding voltage and current conversion during the sampling process of each voltage and current signal in the regulator circuit 21.

Specifically, the voltage sampling circuit 23 is correspondingly coupled between the adjusting circuit 21 and the control circuit 22 to connect the adjusting circuit 21 and the control circuit 22, and when receiving the first to third phase voltage signals and the working voltage signals sent by the adjusting circuit 21, respectively adjust the first to third phase voltage signals and the working voltage signals into first to third voltage sampling signals and the working voltage sampling signals, so as to send the first to third voltage sampling signals and the working voltage sampling signals to the control circuit 22.

Further, the current sampling circuit 24 is correspondingly coupled between the adjusting circuit 21 and the control circuit 22 to connect the adjusting circuit 21 with the control circuit 22, and when any two of the first to third phase current signals are received, adjust any two of the received first to third phase current signals to first to second current sampling signals for sending to the control circuit 22.

Wherein the control circuit 22 receives the first to third voltage sampling signals and the operating voltage sampling signals sent by the voltage sampling circuit 23, and the first to second current sampling signals sent by the current sampling circuit 24In the number, a third current sampling signal corresponding to the other of the first to third phase current signals is obtained by using the first to second current sampling signals and calculating according to a set functional relationship, for example, when the first current sampling signal I is obtained _A And a second current sampling signal I _B Then a third current sampling signal I can be calculated _C ＝0-I _A -I _B 。

The control circuit 22 specifically generates a control signal by using the first to third voltage sampling signals, the operating voltage sampling signals, and the first to third phase current sampling signals, so as to send the control signal to the adjusting circuit 21, so that the adjusting circuit 21 changes the conducting state under the action of the control signal, and adjusts the operating voltage signal output to the load circuit 200.

Optionally, the first to third voltage sampling signals, the working voltage sampling signals, and the first to third phase current sampling signals may be weak current signals, and may be digital signals or analog signals, that is, the voltage sampling circuit 23 and the current sampling circuit 24 may be integrated with analog-to-digital conversion sub-circuits, so as to have a voltage-to-current conversion function and an analog-to-digital conversion function, so that after each sampling signal is converted into a digital signal, the digital signal is sent to the control circuit 22, so as to facilitate signal processing of the control circuit 22; alternatively, the voltage sampling circuit 23 and the current sampling may specifically also directly provide each sampling signal in the form of an analog signal to the control circuit 22, so that the control circuit 22 performs corresponding analog-to-digital conversion, or directly processes the analog signal, which is not limited in the present application.

In an embodiment, the adjusting circuit 21 specifically further includes a first power supply connection 211, a second power supply connection 212, and a third power supply connection 213, and the first power supply connection 211, the second power supply connection 212, and the third power supply connection 213 are respectively coupled to the first power supply line 101, the second power supply line 102, and the third power supply line 103 of the external power supply 100 and grounded, so as to receive the first to third phase voltage signals respectively sent by the power supply 100 through the first power supply line 101, the second power supply line 102, and the third power supply line 103, and the first to third phase current signals respectively sent by the first power supply line 101, the second power supply line 102, and the third power supply line 103.

The number of the current sampling circuits 24 in the power conversion circuit 20 is specifically two, and the two current sampling circuits 24 are specifically coupled to any two of the first power connection terminal 211, the second power connection terminal 212, and the third power connection terminal 213, for example, the first power connection terminal 211 and the second power connection terminal 212, or the first power connection terminal 211 and the third power connection terminal 213, or the second power connection terminal 212 and the third power connection terminal 213, respectively, for sampling the first phase current signal and the second phase current signal, or the first phase current signal and the third phase current signal, or the second phase current signal and the third phase current signal, respectively, in the adjusting circuit 21, respectively, so as to adjust the obtained phase current signals into the first current sampling signal and the second current sampling signal, respectively, and send the first phase current signal and the second current sampling signal to the control circuit 22.

Optionally, the current sampling circuit 24 may specifically include a hall chip or a shunt, and when the shunt is used, the disadvantage of hall chip sampling is not only solved, but also the volume is small, the precision is high, the linearity is good, the working temperature range is wide, and the current sampling circuit has popularization and use values in industry; by configuring the two current sampling circuits 24, one current divider and the corresponding isolation amplifier can be saved, so that the hardware implementation cost of the electric energy conversion circuit 20 can be reduced as much as possible, which is not limited in the present application.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a third embodiment of the power conversion circuit according to the present application. The difference between the power conversion circuit in this embodiment and the first embodiment of the power conversion circuit provided by the present application is that the adjusting circuit 31 in the power conversion circuit 30 specifically further includes a first switch sub-circuit 314, a second switch sub-circuit 315, and a third switch sub-circuit 316; and the control circuit 32 in the power conversion circuit 30 further includes a first switching sub-circuit 314, a second switching sub-circuit 315, and a third switching sub-circuit 316 and a pulse width modulation circuit 322.

Specifically, the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are coupled to the voltage sampling circuit 33, the current sampling circuit 34 and the pulse width modulation circuit 322, and the pulse width modulation circuit 322 is correspondingly coupled to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316.

The first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are configured to receive the first to third voltage sampling signals and the operating voltage sampling signals sent by the voltage sampling circuit 33, and to receive the first to second current sampling signals sent by the current sampling circuit 34, so as to obtain a third current sampling signal by using the first to second current sampling signals and calculating according to a set functional relationship, for example, when the first current sampling signal I is obtained _A And a second current sampling signal I _B Then a third current sampling signal I can be calculated _C ＝0-I _A -I _B 。

When the first switching sub-circuit 314, the second switching sub-circuit 315, and the third switching sub-circuit 316 obtain the first to third voltage sampling signals, the operating voltage sampling signals, and the first to third phase current sampling signals, the pulse width modulation circuit 322 can be controlled by an internal control algorithm, such as a dual PI (proportional integral) control algorithm, to generate the first to third pulse width modulation signals with corresponding duty ratios or signal frequencies by using the first to third voltage sampling signals, the operating voltage sampling signals, and the first to third phase current sampling signals.

Further, the pwm circuit 322 specifically sends the first to third pwm signals with corresponding duty ratios or signal frequencies to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, respectively, so as to change the on states of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, that is, adjust the on times of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, thereby adjusting the operating voltage signal output to the load circuit 200.

The first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 specifically acquire the working voltage signal output to the load circuit 200 in real time, so as to adjust the duty ratio or the signal frequency of the first to third pulse width modulation signals correspondingly output by the pulse width modulation circuit 322 according to the real-time variation of the working voltage signal.

In an embodiment, the control circuit 32 specifically further includes a first filter circuit 323, the first filter circuit 323 is coupled to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, and the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are further configured to detect whether the operating voltage sampling signal corresponding to the voltage sampling circuit 33 is 0, so as to determine whether the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 in the adjusting circuit 31 are currently in a standby state, and connect the first filter circuit 323 to the current sampling circuit 34 when the operating voltage sampling signal is detected as 0.

It can be appreciated that when the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 in the adjusting circuit 31 are currently in a standby state, that is, the load circuit 200 is not currently operated, and the operating voltage signal is not provided to the load circuit 200, the energy storage device is stored in the adjusting circuit 31, so that the energy remaining during the stage operation of the load circuit 200 is still stored in the energy storage device, and is fed back to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 through the current sampling circuits 34. The first to second current sampling signals sent by the current sampling circuit 34 to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 at this time correspond to a partial component of the first to second current sampling signals when the load circuit 200 is operated, i.e. the operating voltage sampling signal is not in the 0 state.

When connected to the current sampling circuit 34, the first filter circuit 323 receives the first to second current sampling signals currently sent by the current sampling circuit 34, and filters the current first to second current sampling signals to obtain first to second direct current components, so as to send the first to third switch sub-circuits 314, 315 and 316.

Further, when the first switching sub-circuit 314, the second switching sub-circuit 315 and the third switching sub-circuit 316 detect that the working voltage sampling signal is not 0, the first current filtering signal to the second current filtering signal without the dc component is obtained by calculating the current first current sampling signal to the second current sampling signal and the first dc component to the second dc component, and specifically, the first current filtering signal is obtained by subtracting the first dc component from the first current sampling signal, and the second current filtering signal is obtained by subtracting the second dc component from the second current sampling signal.

The first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 specifically utilize the first current filtering signal to the second current filtering signal and calculate the third current sampling signal according to a set functional relationship, so as to control the pulse width modulation circuit 322 to generate the first pulse width modulation signal to the third pulse width modulation signal by utilizing the first voltage sampling signal to the third voltage sampling signal, the working voltage sampling signal, the first current filtering signal to the second current filtering signal and the third current sampling signal, and send the first pulse width modulation signal to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 respectively, thereby adjusting the on states of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 to meet the working requirements of the load circuit 200.

It can be understood that by filtering the dc components in the first to second current sampling signals, the actual current signals when the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are in the working state can be fed back more truly, so that the loop control effect of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 is improved significantly, especially when the regulating circuit 31 has higher power factor and smaller current harmonic content, the stable operation of the electric energy converting circuit 30 can be ensured effectively, and the control complexity of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 is reduced, so as to ensure better power factor correction effect.

Alternatively, it is considered that the ac component in the grid system is 50Hz (hertz)/60 Hz and other high frequency spurious components, that is, the dc component, the ac component and the high frequency spurious component will be present in each current signal correspondingly output to the regulating circuit 31 by the power supply 100, and the ac component is the actual current signal corresponding to each current signal.

The first filter circuit 323 can be specifically low-pass filtering, and the filter cut-off frequency can be 1Hz-5Hz, so that the first to second direct current components in the first to second current sampling signals can be obtained through effective filtering, and the first to second current filtering signals which are closer to the actual current signals can be obtained through corresponding calculation by the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, so that the control complexity of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 is reduced, and better power factor correction effect is ensured through the adjustment of the working voltage signals.

And when the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are in the standby state, the first to second direct current components can be obtained through the first filter circuit 323 for multiple times, and then digital averaging is performed on the first to second direct current components, so that the actual current signals on the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 can be reflected more truly.

In another embodiment, the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 can be specifically calculated by a program, or can be understood as a digital low-pass filtering process to replace the first filter circuit 323 to achieve a corresponding filtering effect, or other circuit forms for obtaining the dc component, so as to further achieve the purpose of reducing the hardware cost of the power conversion circuit 30.

Further, in an embodiment, the control circuit 32 specifically further includes a second filter circuit 324, the second filter circuit 324 is coupled to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, and when the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 detect that the operating voltage sampling signal sent by the voltage sampling circuit 33 is not 0, the second filter circuit 324 can be specifically connected to the current sampling circuit 34, so that the second filter circuit 324 receives the first to second current sampling signals currently sent by the current sampling circuit 34, and filters the current first to second current sampling signals to obtain the first to second low frequency components for sending to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316;

the first switch sub-circuit 314, the second switch sub-circuit 315, and the third switch sub-circuit 316 may specifically calculate the first current filtered signal to the second current filtered signal by using the first low frequency component and the first dc component to the second low frequency component, for example, the first low frequency component is subtracted from the first dc component to obtain the first current filtered signal, and the second low frequency component is subtracted from the second dc component to obtain the second current filtered signal.

It will be appreciated that the respective current signals correspondingly output by the power supply 100 to the regulating circuit 31 have, in addition to the dc component, in particular also high-frequency spurious components, which therefore have to be further filtered out.

The second filter circuit 324 may be specifically and correspondingly low-pass filtering, and the filtering cut-off frequency of the second filter circuit 324 is greater than the filtering cut-off frequency of the first filter circuit 323, and may be specifically greater than 60Hz, but less than 100Hz, that is, corresponding to any one of 60Hz-100Hz, so as to effectively filter and obtain the dc component and the ac component of the first to second current sampling signals, which do not include the high-frequency spurious component, so that the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 can further obtain the first to second current filtering signals closer to the actual current signals through corresponding calculation, thereby reducing the control complexity of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, and further ensuring better power factor correction effect through adjusting the working voltage signals.

Similarly, in other embodiments, the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 may be specifically calculated by a program, or may be understood as a digital low-pass filtering process instead of the second filter circuit 324 to achieve a corresponding filtering effect, or may be implemented in other circuit forms for obtaining a dc component, so as to further achieve the purpose of reducing the hardware cost of the power conversion circuit 30.

In one embodiment, the control circuit 32 further includes an analog-to-digital conversion circuit 325, and the first switch sub-circuit 314, the second switch sub-circuit 315, and the third switch sub-circuit 316 are coupled to the voltage sampling circuit 33 and the current sampling circuit 34 through the analog-to-digital conversion circuit 325. The analog-to-digital conversion circuit 325 receives the first to third voltage sampling signals and the operating voltage sampling signals sent by the voltage sampling circuit 33 and the first to second current sampling signals sent by the current sampling circuit 34, specifically converts the first to third voltage sampling signals, the operating voltage sampling signals and the first to second current sampling signals into first to third voltage digital signals, the operating voltage digital signals and the first to second current digital signals, and sends the first to third voltage digital signals, the operating voltage digital signals and the first to second current digital signals to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316.

The first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 specifically use the first current digital signal to the second current digital signal and calculate a third current digital signal corresponding to the other one of the first current signal to the third current digital signal according to a set functional relationship, so as to control the pulse width modulation circuit 322 to generate the first pulse width modulation signal to the third pulse width modulation signal by using the first voltage digital signal to the third voltage digital signal, the working voltage digital signal and the first current digital signal to the third current digital signal.

It can be appreciated that by converting the voltage and current signals fed back by the voltage sampling circuit 33 and the current sampling circuit 34 into digital signals, the processing calculation of the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 can be effectively facilitated, so as to ensure the processing efficiency and the effectiveness thereof.

Optionally, the first switch sub-circuit 314, the second switch sub-circuit 315, and the third switch sub-circuit 316 may specifically include one or more of an MCU (Micro Control Unit ) circuit, a CPU (Central Processing Unit, central processing unit), a single chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit units for forming a program and a signal processing function, which is not limited in the present application.

In an embodiment, the power conversion circuit 30 further includes a driving circuit 35, and the driving circuit 35 is coupled to the pwm circuit 322 and the first, second and third switch sub-circuits 314, 315 and 316, and is configured to receive the first to third pwm signals correspondingly transmitted by the pwm circuit 322, and then respectively adjust the first to third pwm signals to first to third driving signals, and then respectively transmit the first to third driving signals to the first, second and third switch sub-circuits 314, 315 and 316, so that the first, second and third switch sub-circuits 314, 315 and 316 respectively change the on state under the action of the first to third driving signals.

Further, in an embodiment, the driving circuit 35 further includes a power amplifier sub-circuit (not shown) and a second isolation sub-circuit (not shown), and the power amplifier sub-circuit is specifically coupled to the pulse width modulation circuit 322 and the second isolation sub-circuit, and the second isolation sub-circuit is further coupled to the first switch sub-circuit 314, the second switch sub-circuit 315, and the third switch sub-circuit 316.

When the power amplifier sub-circuit receives the first to third pulse width modulation signals sent by the pulse width modulation circuit 322, specifically, the power amplifier sub-circuit performs power amplification adjustment on the first to third pulse width modulation signals to adjust the first to third pulse width modulation signals into first to third driving signals respectively, and then sends the first to third driving signals to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 respectively through the second isolation sub-circuit.

Optionally, the second isolation sub-circuit may specifically include an optocoupler or an isolation transformer for isolating the strong current portion of the regulating circuit 31 from the weak current portion of the control circuit 32, so as to avoid damage to the weak current portion by the strong current portion.

With continued reference to fig. 4, fig. 4 is a schematic diagram illustrating a detailed structure of an embodiment of the adjusting circuit 31 and the control circuit 32 in the power conversion circuit 30 in fig. 3.

In one embodiment, the adjusting circuit 31 further includes a first power connection terminal 311, a second power connection terminal 312, a third power connection terminal 313, a filter energy storage sub-circuit 317, a rectifier sub-circuit 318, a first switch sub-circuit 314, a second switch sub-circuit 315, a third switch sub-circuit 316, and a regulated output sub-circuit 319; the first power connection terminal 311, the second power connection terminal 312 and the third power connection terminal 313 are respectively coupled to the first power supply line 101, the second power supply line 102 and the third power supply line 103 of the power supply 100 and grounded, the filter tank sub-circuit 317 is coupled to the first power connection terminal 311, the second power connection terminal 312, the third power connection terminal 313 and the rectifier sub-circuit 318, the rectifier sub-circuit 318 is coupled to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316, and the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 are coupled to the regulated output sub-circuit 319.

The filter tank subcircuit 317 further includes a first inductor La, a second inductor Lb, and a third inductor Lc; the rectifier circuit 318 further includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6; the first switching circuit comprises a first A-phase switching tube Qa1, a second A-phase switching tube Qa2, a first A-phase diode Da1 and a second A-phase diode Da2; the second switching circuit comprises a first B-phase switching tube Qb1, a second B-phase switching tube Qb2, a first B-phase diode Db1 and a second B-phase diode Db2; the third switching circuit comprises a first C-phase switching tube Qc1, a second C-phase switching tube Qc2, a first C-phase diode Dc1 and a second C-phase diode Dc2; the regulated output subcircuit 319 further includes a first capacitor C1, a second capacitor C2, and an output resistor Ro; the connection manner of the above elements is shown in fig. 4, and will not be described here again.

With continued reference to fig. 5, fig. 5 is a schematic diagram illustrating a detailed structure of an embodiment of the current sampling circuit 34 in the power conversion circuit 30 in fig. 3.

In an embodiment, the adjusting circuit 31 includes a first power connection terminal 311, a second power connection terminal 312 and a third power connection terminal 313, and the first power connection terminal 311, the second power connection terminal 312 and the third power connection terminal 313 are respectively coupled to the first power supply line 101, the second power supply line 102 and the third power supply line 103 of the power supply 100 and grounded, and the number of the current sampling circuits 34 is two.

And each of the current sampling circuits 34 further includes a current divider 341, i.e. a current divider Ra/Rc (or Ra/Rb, or Rb/Rc), a first isolation sub-circuit 342, and an operational amplifier sub-circuit 343, wherein the current divider Ra/Rc is specifically coupled to any one of the first power supply connection terminal 311, the second power supply connection terminal 312, and the third power supply connection terminal 313 and the first isolation sub-circuit 342, and the first isolation sub-circuit 342 is coupled to the operational amplifier sub-circuit 343, and the operational amplifier sub-circuit 343 is coupled to the control circuit 32.

Wherein two different shunts Ra/Rc are respectively coupled to any two of the first power connection terminal 311, the second power connection terminal 312 and the third power connection terminal 313 for receiving the first phase current signal i correspondingly transmitted by any two of the first power connection terminal 311, the second power connection terminal 312 and the third power connection terminal 313 _a Second phase current signal i _b Third phase current signal i _c Is sent to the operational amplifier sub-circuit 343 through the first isolation sub-circuit 342, and is further amplified by the operational amplifier sub-circuit 343 and then is output to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316.

Optionally, the first isolation sub-circuit 342 may specifically include an optocoupler or an isolation transformer for isolating the strong current portion of the regulator circuit 31 from the weak current portion of the control circuit 32 to avoid damage to the weak current portion by the strong current portion.

Further, in an embodiment, the operational amplifier sub-circuit 343 specifically further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, an operational amplifier YF, a first power supply +vdd, and a second power supply Vs, wherein the first end of the first resistor R1 is connected to the first end of the first isolation sub-circuit 342, the second end of the first resistor R1 is connected to the positive end of the operational amplifier YF and the first end of the third resistor R3, the second end of the third resistor R3 is connected to the first power supply +vdd, the first end of the second resistor R2 is connected to the second end of the first isolation sub-circuit 342, the second end of the second resistor R2 is connected to the negative end of the operational amplifier YF and the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the output end of the operational amplifier YF and the control circuit 32, and the power supply end of the operational amplifier YF is connected to the second power supply Vs.

Since the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 cannot recognize voltage signals below 0V, the first power supply +vdd may be a dc power supply with a positive bias voltage +1.65v or +2.5v, and the second power supply Vs may be an operational amplifier power supply including +vs, -Vs with opposite polarities, so that signals satisfying 0-3.3V/5V recognizable by the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 can be obtained through the operational amplifier sub-circuit 343.

For ease of understanding, the first switching sub-circuit 314, the second switching sub-circuit 315, and the third switching sub-circuit 316 are specifically implemented for the first phase current signal i _a Second phase current signal i _b Third phase current signal i _c A first phase current signal i in (a) _a And a third phase current signal i _c Taking the sampling as an example, it is known that the first current sampling signal via and the second current sampling signal vic obtained after the sampling are actually voltage signals.

And the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 may specifically calculate the third current sampling signal vib=0-via-vic according to a set functional relationship.

With continued reference to fig. 6, fig. 6 is a detailed schematic diagram of an embodiment of the voltage sampling circuit 33 in the power conversion circuit 30 in fig. 3.

Further, for convenience of understanding, taking the first phase voltage signal Vsa, the second phase voltage signal Vsb, the third phase voltage signal Vsc and the operating voltage signal Vou as examples, after being regulated by the voltage sampling circuit 33, the first voltage sampling signal Va, the second voltage sampling signal Vb, the third voltage sampling signal Vc and the operating voltage sampling signal Vo are obtained, it can be known that the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 specifically control the pulse width modulation circuit 322 to utilize the first current sampling signal via, the second current sampling signal vic, the third current sampling signal vib, the first voltage sampling signal Va, the second voltage sampling signal Vb, the third voltage sampling signal Vc and the operating voltage sampling signal Vo to generate the first pulse width modulation signal PWM1, the second pulse width modulation signal PWM2 and the third pulse width modulation signal PWM3, and send the first pulse width modulation signal PWM2 and the third pulse width modulation signal 3 to the first switch sub-circuit 314, the second switch sub-circuit 315 and the third switch sub-circuit 316 to respectively, and the second switch sub-circuit 314 and the third switch sub-circuit 316 to change the pulse width modulation signal PWM1, the pulse width modulation signal PWM2 and the third switch sub-circuit 316 to change the pulse width modulation state of the first switch sub-circuit 314 and the third switch sub-circuit 315 and the operating voltage sampling signal PWM.

According to the scheme, the two-phase alternating current is reasonably sampled and calculated, and the stable bus voltage output, the higher power factor and the extremely small current harmonic content are realized by combining an advanced double-PI control algorithm, so that the hardware cost and the volume of the electric energy conversion circuit 30 are further reduced, the application range of the current sampling circuit 34 is increased, and the wide application of the electric energy conversion circuit 30 in the fields of electric automobile charging, communication power supply, aerospace and the like is greatly promoted.

Referring to fig. 7, fig. 7 is a flow chart of a first embodiment of the power conversion method according to the present application. Specifically, the method may include the steps of:

s41: first to third voltage signals and first to third current signals transmitted by an external power supply are received.

It can be understood that the power conversion method in this embodiment is specifically a method in which, when the power conversion circuit receives three-phase alternating current supplied from an external power supply, that is, the first to third phase voltage signals and the first to third phase current signals, the power conversion circuit performs power conversion by using the first to third phase voltage signals and the first to third phase current signals, so as to supply the three-phase alternating current to an external load circuit. The electric energy conversion circuit specifically comprises a regulating circuit and a control circuit which are coupled, and the regulating circuit is correspondingly coupled with an external power supply source and a load circuit.

The sum of the first to third phase current signals is equal to 0 when the power supply source is a power grid power supply adopting a three-phase four-wire system mode to supply power, so that after any two of the first to third phase current signals are acquired, the other remaining one can be calculated according to the set function relation.

Specifically, the regulating circuit in the electric energy conversion method receives the first to third voltage signals and the first to third current signals sent by the external power supply.

S42: the first through third phase current signals are regulated to an operating voltage signal for supply to a load circuit.

Further, the regulating circuit regulates the first to third phase current signals into working voltage signals through the internal energy storage sub-circuit, the rectifier sub-circuit, the switch sub-circuits and other circuit units so as to provide the working voltage signals for the load circuit.

S43: and calculating the other one of the first to third phase current signals according to the set functional relation by using any two of the first to third phase current signals.

Specifically, the regulating circuit sends any two of the first to third phase voltage signals, the working voltage signals and the first to third phase current signals to the control circuit, so that the control circuit calculates the other one of the first to third phase current signals by using any two of the first to third phase current signals according to a set functional relation.

S44: the control signal is generated using the first to third phase voltage signals, the operating voltage signal, and the first to third phase current signals.

Further, the control circuit generates the control signal using the first to third phase voltage signals, the operating voltage signal, and the first to third phase current signals.

S45: the operating voltage signal is regulated by a control signal.

Still further, the control circuit sends the control signal to the adjusting circuit, so that the adjusting circuit changes the conducting state under the action of the control signal, for example, the control signal adjusts the conducting time of part of lines in the adjusting circuit, so that the working voltage signal output to the load circuit changes correspondingly.

The control circuit can specifically perform sampling and corresponding adjustment on each signal in the adjusting circuit in real time, and can also realize real-time feedback adjustment through sampling the working voltage signal, namely, the control circuit circularly executes S42-S45 so as to ensure that the working voltage signal correspondingly output to the load circuit can be kept stable, thereby enabling the load circuit to be kept in a stable working state.

Referring to fig. 8, fig. 8 is a flow chart of a second embodiment of the power conversion method according to the present application. The power conversion method of the present embodiment is a flowchart of a refinement of the power conversion method in fig. 7, and specifically includes the following steps:

S51: first to third voltage signals and first to third current signals transmitted by an external power supply are received.

S52: the first through third phase current signals are regulated to an operating voltage signal for supply to a load circuit.

The S51 and S52 are the same as S41 and S42 in fig. 7, and specific reference is made to S41 and S42 and the related text descriptions thereof, which are not repeated here.

S53: the first to third phase voltage signals and the working voltage signal are respectively adjusted to first to third voltage sampling signals and the working voltage sampling signal.

It is understood that the power conversion circuit may specifically further include a voltage sampling circuit coupled to the adjusting circuit and the control circuit, so that when the first to third voltage signals and the working voltage signals sent by the external power supply are received, the first to third voltage signals and the working voltage signals are respectively adjusted to the first to third voltage sampling signals and the working voltage sampling signals by the voltage sampling circuit, and sent to the control circuit.

S54: any two of the first to third phase current signals are conditioned to first to second current sampling signals.

Further, the power conversion circuit may specifically further include a current sampling circuit coupled to the adjusting circuit and the control circuit, so that when receiving the first to third phase current signals sent by the external power supply, any two of the first to third phase current signals are sampled by the current sampling circuit, adjusted to the first to second current sampling signals, and sent to the control circuit.

S55: and calculating a third current sampling signal corresponding to the other one of the first to third current signals according to the set functional relation by using the first to second current sampling signals.

Specifically, when the control circuit receives the first current sampling signal to the second current sampling signal correspondingly sent by the current sampling circuit, a third current sampling signal corresponding to the other one of the first current signal to the third current signal is obtained by calculating the first current sampling signal to the second current sampling signal according to a set functional relation.

S56: the control signal is generated using the first to third voltage sampling signals, the operating voltage sampling signal, and the first to third phase current sampling signals.

Further, the control circuit specifically generates the control signal using the first to third voltage sampling signals, the operating voltage sampling signal, and the first to third phase current sampling signals.

S57: the operating voltage signal is regulated by a control signal.

The S57 is the same as S45 in fig. 7, and the detailed description of S45 and related text is omitted herein.

Referring to fig. 9, fig. 9 is a flow chart of a third embodiment of the power conversion method according to the present application. The power conversion method of the present embodiment is a flowchart of a refinement of the power conversion method in fig. 8, and specifically includes the following steps:

S61: first to third voltage signals and first to third current signals transmitted by an external power supply are received.

S62: the first through third phase current signals are regulated to an operating voltage signal for supply to a load circuit.

S63: the first to third phase voltage signals and the working voltage signal are respectively adjusted to first to third voltage sampling signals and the working voltage sampling signal.

S64: any two of the first to third phase current signals are conditioned to first to second current sampling signals.

The S61, S62, S63 and S64 are the same as S51, S52, S53 and S54 in fig. 8, respectively, and specific reference is made to S51, S52, S53 and S54 and the related text descriptions thereof, and are not repeated here.

S65: and detecting whether an adjusting instruction sent by the upper computer is received.

It is understood that the regulating circuit in the electric energy conversion circuit specifically further includes first to third switch sub-circuits; the electric energy conversion circuit specifically further comprises a signal processing circuit and a pulse width modulation circuit, wherein the signal processing circuit is coupled with the voltage sampling circuit, the current sampling circuit and the pulse width modulation circuit, and the pulse width modulation circuit is correspondingly coupled with the first switch sub-circuit to the third switch sub-circuit.

The signal processing circuit is specifically used for detecting whether an adjusting instruction sent by the upper computer is received or not.

It should be noted that, the upper computer specifically refers to any reasonable intelligent terminal with a signal processing function, such as a computer, a smart phone or a smart watch, which can directly send out a control command, and the upper computer specifically may also be any reasonable hardware switch capable of inputting an adjustment command by a user through pressing, etc., which is not limited by the present application.

Wherein, if the adjustment instruction sent by the upper computer is not received, S66 is executed, and if the adjustment instruction sent by the upper computer is received, S67 is executed.

S66: and filtering the current first current sampling signal to the current second current sampling signal to obtain first direct current components to second direct current components.

Specifically, the electric energy conversion circuit further includes a first filter circuit coupled to the signal processing circuit, and when the signal processing circuit detects that the working voltage sampling signal is 0, the first filter circuit is connected to the current sampling circuit, so that the first filter circuit filters the current first current sampling signal to the current second current sampling signal to obtain the first direct current component to the second direct current component.

S67: and calculating the first current filtering signal and the second current filtering signal by using the current first current sampling signal and the second current sampling signal and the first direct current component and the second direct current component.

Further, when the signal processing circuit detects that the working voltage sampling signal is not 0, the current first to second current sampling signals and the first to second direct current components are utilized to calculate a first to second current filtering signal without the direct current component, specifically, the first current sampling signal is adopted to subtract the first direct current component to obtain a first current filtering signal, and the second current sampling signal is adopted to subtract the second direct current component to obtain a second current filtering signal.

S68: and calculating a third current sampling signal according to the set functional relation by using the first current filtering signal to the second current filtering signal.

Still further, the signal processing circuit specifically uses the first current filtering signal to the second current filtering signal and calculates a third current sampling signal according to a set functional relation.

S69: the first to third pulse width modulation signals are generated using the first to third voltage sampling signals, the operating voltage sampling signal, the first to second current filtering signals, and the third current sampling signal.

Specifically, the signal processing circuit controls the pulse width modulation circuit to generate first to third pulse width modulation signals using the first to third voltage sampling signals, the operating voltage sampling signal, the first to second current filtering signals, and the third current sampling signal.

S610: the operating voltage signal is regulated by the first to third pulse width modulation signals.

Further, the pulse width modulation circuit sends the first to third pulse width modulation signals to the first to third switch sub-circuits respectively, so that the conducting states of the first to third switch sub-circuits are adjusted to meet the working requirements of the load circuit.

Referring to fig. 10, fig. 10 is a flowchart of an embodiment of S67 in fig. 9. In one embodiment, the power conversion method of the present application further includes some more specific steps in addition to the steps S61-S610 described above. Specifically, the step S67 may specifically further include the following steps:

s671: the current first to second current sampling signals are filtered to obtain first to second low frequency components.

It can be understood that the control circuit specifically further includes a second filter circuit, where the second filter circuit is coupled to the signal processing circuit, and when the signal processing circuit detects that the adjustment command sent by the host computer is received, the second filter circuit may specifically be further connected to the current sampling circuit, so that the second filter circuit receives the first to second current sampling signals currently sent by the current sampling circuit, and filters the current first to second current sampling signals to obtain first to second low frequency components, so as to send the first to second low frequency components to the signal processing circuit.

S672: the first to second current filtered signals are calculated using the first to second low frequency components and the first to second direct current components.

Specifically, the signal processing circuit may further calculate the first to second current filtered signals by using the first to second low frequency components and the first to second direct current components, for example, the first low frequency component is subtracted from the first direct current component to obtain the first current filtered signal, and the second low frequency component is subtracted from the second direct current component to obtain the second current filtered signal.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an embodiment of an electric energy conversion device according to the present application. In the present embodiment, the power conversion device 70 includes a housing 71 and a power conversion circuit 72 connected to the housing 71.

Alternatively, the electric energy conversion device 70 may be an electric vehicle charging device, or any other reasonable electronic device that needs to convert three-phase ac power into dc power, such as a communication power supply device, aerospace, or manufacturing, which is not limited in this application.

It should be noted that the power conversion circuit 72 in this embodiment is the power conversion circuit 10, the power conversion circuit 20 or the power conversion circuit 30 in any of the above embodiments, and detailed descriptions thereof are omitted herein with reference to fig. 1-6 and related text.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. An electrical energy conversion circuit, the electrical energy conversion circuit comprising:

the adjusting circuit is coupled with an external power supply and the load circuit, and is used for receiving the first to third phase voltage signals and the first to third phase current signals sent by the power supply, adjusting the first to third phase current signals into working voltage signals and providing the working voltage signals for the load circuit; wherein the first to third phase current signals satisfy a set functional relationship;

the voltage sampling circuit is coupled with the adjusting circuit to sample the first to third phase voltage signals and the working voltage signal of the adjusting circuit so as to respectively adjust the first to third phase voltage signals and the working voltage signal into first to third voltage sampling signals and the working voltage sampling signal;

a current sampling circuit coupled to the adjusting circuit to sample any two of the first to third phase current signals to adjust any two of the sampled first to third phase current signals to first to second current sampling signals;

the control circuit comprises a signal processing circuit and a first filter circuit, wherein the signal processing circuit is coupled with the regulating circuit, the voltage sampling circuit, the current sampling circuit and the first filter circuit, and receives the first to third voltage sampling signals and the working voltage sampling signals sent by the voltage sampling circuit and the first to second current sampling signals sent by the current sampling circuit;

When the signal processing circuit detects that the working voltage sampling signal is 0, the first filter circuit is connected with the current sampling circuit, so that the first filter circuit receives the first current sampling signal to the second current sampling signal currently transmitted by the current sampling circuit, and filters the current first current sampling signal to the second current sampling signal to obtain first direct current components to second direct current components;

when the working voltage sampling signal is not 0, the signal processing circuit calculates a first current filtering signal and a second current filtering signal by utilizing the current first current sampling signal and the second current sampling signal and the first direct current component and a third current sampling signal by utilizing the first current filtering signal and the second current filtering signal and calculating according to the set functional relation, so as to control the pulse width modulation circuit to generate a first pulse width modulation signal and a third pulse width modulation signal by utilizing the first voltage sampling signal, the third voltage sampling signal, the first current filtering signal, the second current filtering signal and the third current sampling signal, and send a control signal to the regulating circuit, thereby enabling the regulating circuit to change a conducting state under the action of the control signal so as to regulate the working voltage signal; wherein the control signal is based on the first to third pulse width modulated signals.

2. The power conversion circuit according to claim 1, wherein,

the regulating circuit comprises first to third power supply line connection ends which are respectively coupled to first to third power supply lines of the power supply source and are grounded through the first to third power supply lines of the power supply source, the number of the current sampling circuits is two, each current sampling circuit comprises a current divider, a first isolation sub-circuit and an operational amplifier sub-circuit, the current divider is coupled with any one of the first to third power supply line connection ends and the first isolation sub-circuit, the first isolation sub-circuit is coupled with the operational amplifier sub-circuit, and the operational amplifier sub-circuit is coupled with the control circuit; wherein, two said shunts are coupled to any two of said first to third power supply line connection ends respectively.

3. The power conversion circuit according to claim 2, wherein,

4. The power conversion circuit according to claim 1, wherein,

the regulating circuit comprises first to third switch sub-circuits, the control circuit comprises a pulse width modulation circuit, the signal processing circuit is coupled with the pulse width modulation circuit, and the pulse width modulation circuit is coupled with the first to third switch sub-circuits;

the signal processing circuit receives the first to third voltage sampling signals and the working voltage sampling signals sent by the voltage sampling circuit, and the first to second current sampling signals sent by the current sampling circuit, so as to calculate the third current sampling signals according to the set functional relation, control the pulse width modulation circuit to generate the first to third pulse width modulation signals by using the first to third voltage sampling signals, the working voltage sampling signals and the first to third current sampling signals, and send the first to third pulse width modulation signals to the first to third switch sub-circuits respectively, so that the first to third switch sub-circuits change the conducting state under the action of the first to third pulse width modulation signals respectively.

5. The power conversion circuit according to claim 1, wherein,

the control circuit further comprises a second filter circuit, the second filter circuit is coupled with the signal processing circuit, and when the signal processing circuit detects that the working voltage sampling signal sent by the voltage sampling circuit is not 0, the second filter circuit is connected with the current sampling circuit, so that the second filter circuit receives the first current sampling signal to the second current sampling signal currently sent by the current sampling circuit, and filters the current first current sampling signal to the second current sampling signal to obtain a first low frequency component to a second low frequency component to be sent to the signal processing circuit;

the signal processing circuit calculates the first current filtering signal and the second current filtering signal by using the first low frequency component, the second low frequency component and the first direct current component and the second direct current component.

6. The power conversion circuit of claim 4, wherein,

the control circuit further comprises an analog-to-digital conversion circuit, the signal processing circuit is coupled with the voltage sampling circuit and the current sampling circuit through the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit receives the first to third voltage sampling signals and the working voltage sampling signals sent by the voltage sampling circuit and the first to second current sampling signals sent by the current sampling circuit so as to convert the first to third voltage sampling signals, the working voltage sampling signals and the first to second current sampling signals into first to third voltage digital signals, working voltage digital signals and first to second current digital signals respectively.

7. The electrical energy conversion circuit of any one of claims 4-6, wherein,

8. The power conversion circuit according to claim 7, wherein,

the driving circuit comprises a power amplifier sub-circuit and a second isolation sub-circuit, the power amplifier sub-circuit is coupled with the pulse width modulation circuit and the second isolation sub-circuit, the second isolation sub-circuit is coupled with the first switch sub-circuit to the third switch sub-circuit, and the power amplifier sub-circuit receives the first pulse width modulation signal to the third pulse width modulation signal sent by the pulse width modulation circuit, so that the first pulse width modulation signal to the third pulse width modulation signal are respectively adjusted to be the first driving signal to the third driving signal, and the first pulse width modulation signal to the third pulse width modulation signal are respectively sent to the first switch sub-circuit through the second isolation sub-circuit.

9. The power conversion circuit according to claim 1, wherein,

the regulating circuit comprises a first power supply line connecting end, a third power supply line connecting end, a filtering energy storage sub-circuit, a rectifier sub-circuit, a first switch sub-circuit, a third switch sub-circuit and a voltage stabilizing output sub-circuit;

the first to third power supply lines are respectively coupled to the first to third power supply lines of the power supply source, and are grounded through the first to third power supply lines of the power supply source, the filtering energy storage sub-circuit is coupled to the first to third power supply lines and the rectifier sub-circuit, the rectifier sub-circuit is coupled to the first to third switch sub-circuits, and the first to third switch sub-circuits are coupled to the regulated output sub-circuit.

10. A method of converting electrical energy, the method comprising:

receiving first to third voltage signals and first to third current signals sent by an external power supply; wherein the first to third phase current signals satisfy a set functional relationship;

adjusting the first to third phase current signals to an operating voltage signal for provision to a load circuit;

adjusting the first to third phase voltage signals and the working voltage signal into first to third voltage sampling signals and a working voltage sampling signal respectively;

Adjusting any two of the first to third phase current signals to first to second current sampling signals;

detecting whether an adjusting instruction sent by an upper computer is received or not;

if the adjusting instruction is not received, when the working voltage sampling signal is 0, filtering the current first current sampling signal to the current second current sampling signal to obtain first direct current components to second direct current components;

if the adjusting instruction is received, when the working voltage sampling signal is not 0, calculating to obtain first to second current filtering signals by using the current first to second current sampling signals and the first to second direct current components;

calculating a third current sampling signal according to the set functional relation by utilizing the first current filtering signal to the second current filtering signal;

generating first to third pulse width modulation signals using the first to third voltage sampling signals, the operating voltage sampling signal, the first to second current filtering signals, and the third current sampling signal;

the operating voltage signal is regulated by the first to third pulse width modulation signals.

11. The power conversion method according to claim 10, wherein the step of calculating first to second current filter signals using the current first to second current sample signals and the first to second direct current components when the operating voltage sample signal is 0 if the adjustment command is received comprises:

If the adjusting instruction is received, when the working voltage sampling signal is 0, filtering the current first current sampling signal to the current second current sampling signal to obtain first low-frequency components to second low-frequency components;

and calculating the first current filtering signal to the second current filtering signal by using the first low frequency component to the second low frequency component and the first direct current component to the second direct current component.

12. An electric energy conversion device, characterized in that the electric energy conversion device comprises a housing and an electric energy conversion circuit connected to the housing;

wherein the power conversion circuit is a power conversion circuit as claimed in any one of claims 1 to 9.