Energy storage converter and energy storage system

Abstract

The utility model relates to the technical field of energy storage circuits, and provides an energy storage converter and an energy storage system, and the energy storage converter comprises a diverter, a reverse amplification circuit, a voltage lifting circuit, a Butterworth filter circuit, and an ADC sampling module. The shunt is used for shunting the current output by the battery and then inputting a voltage signal to the reverse amplification circuit; the reverse amplification circuit is connected to the diverter and is used for amplifying the voltage signal and outputting the amplified voltage signal; the voltage lifting circuit is connected to the reverse amplification circuit and is used for biasing the amplified voltage signal to obtain a bias voltage; the Butterworth filter circuit is connected to the voltage boosting circuit and is used for filtering the bias voltage to obtain a filtered voltage signal; and the ADC sampling module is connected to the Butterworth filter circuit and is used for performing analog-to-digital conversion on the filtered voltage signal and then outputting the voltage signal to the controller. According to the technical scheme, high-frequency ripples in sampling signals can be effectively filtered out, and the sampling precision is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of energy storage circuits, in particular to an energy storage converter and an energy storage system. [Background technology]

[0002] In energy storage systems, such as Figure 1 As shown in the figure, the energy storage converter (PCS) is the core component connecting the battery and the power grid, and is responsible for energy conversion and transmission. The normal operation of the energy storage converter means that the voltage and current information on the power grid side and the battery side needs to be collected to control the AC / DC conversion part. However, since the switching frequency of the conversion part composed of semiconductors is very high during normal operation, high-frequency ripples are inevitably introduced on the DC side. Although a DC filter is set, it is still difficult to filter out all high-frequency ripples except the fundamental wave. After the sampling circuit feeds back the data containing ripples to the controller, it will interfere with the judgment of the controller and affect the normal operation of the equipment. The sampling equipment with filtering function is expensive and does not meet the needs of mass production. [Contents of the utility model]

[0003] The embodiments of the present utility model provide an energy storage converter and an energy storage system, aiming to solve the technical problems existing in the related technologies.

[0004] In a first aspect, an embodiment of the utility model provides an energy storage converter, comprising:

[0005] Shunt, reverse amplifier circuit, voltage boost circuit, Butterworth filter circuit, ADC sampling module;

[0006] The shunt is used to shunt the current output by the battery and then input a voltage signal to the reverse amplifier circuit;

[0007] The reverse amplifier circuit is connected to the shunt and is used to amplify the voltage signal and output the amplified voltage signal;

[0008] The voltage boosting circuit is connected to the reverse amplifying circuit and is used to bias the amplified voltage signal to obtain a bias voltage;

[0009] The Butterworth filter circuit is connected to the voltage boosting circuit and is used to filter the bias voltage to obtain a filtered voltage signal;

[0010] The ADC sampling module is connected to the Butterworth filter circuit and is used for performing analog-to-digital conversion on the filtered voltage signal and outputting the converted signal to the controller.

[0011] In one embodiment, optionally, the reverse amplifier circuit includes:

[0012] A first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a first operational amplifier;

[0013] Wherein, the first resistor is connected to the non-inverting input terminal of the first operational amplifier, and the second resistor is connected to the inverting input terminal of the first operational amplifier;

[0014] The third resistor and the first capacitor are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier;

[0015] The fourth resistor is connected to the output end of the first operational amplifier to limit the current of the amplified voltage signal output by the first operational amplifier;

[0016] One end of the second capacitor is connected to the fourth resistor, and the other end is grounded, so as to filter the amplified voltage signal output by the first operational amplifier.

[0017] In one embodiment, optionally, the voltage boosting circuit includes:

[0018] a fifth resistor, a sixth resistor, a third capacitor, and a second operational amplifier;

[0019] One end of the fifth resistor is connected between the fourth resistor and the second capacitor, and the other end is respectively connected to one end of the sixth resistor, one end of the third capacitor and the non-inverting input end of the second operational amplifier;

[0020] One end of the sixth resistor is connected to the fifth resistor and the same-inverting input end of the second operational amplifier, and the other end is connected to the power supply;

[0021] One end of the third capacitor is connected to the fifth resistor, and the other end is grounded, for filtering output noise;

[0022] The inverting input terminal of the second operational amplifier is short-circuited to the output terminal thereof;

[0023] In one embodiment, optionally, the sixth resistor is a bias resistor, and divides the power supply voltage together with the fifth resistor.

[0024] In one embodiment, optionally, the Butterworth filter circuit includes:

[0025] a seventh resistor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a third operational amplifier;

[0026] One end of the seventh resistor is connected to the output end of the second operational amplifier, and the other end is connected to the eighth resistor;

[0027] One end of the eighth resistor is connected to the seventh resistor and one end of the fourth capacitor respectively, and the other end is connected to the fifth capacitor and the same-direction input end of the third operational amplifier respectively;

[0028] One end of the ninth resistor is connected to the output end of the third operational amplifier, and the other end is connected to the sixth capacitor and the ADC sampling module respectively;

[0029] One end of the fourth capacitor is connected between the seventh resistor and the eighth resistor, and the other end is connected to the output end of the third operational amplifier;

[0030] One end of the fifth capacitor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded;

[0031] One end of the sixth capacitor is connected between the ninth resistor and the ADC sampling module, and the other end is grounded;

[0032] The inverting input terminal of the third operational amplifier is short-circuited to the output terminal thereof.

[0033] In one embodiment, optionally, the fourth capacitor is used to feed back the signal output by the third operational amplifier, and the fifth capacitor is used to filter the signal input to the third operational amplifier.

[0034] In one embodiment, optionally, the ninth resistor and the sixth capacitor form a first-order filter circuit for filtering output noise.

[0035] In one embodiment, optionally, the resistance values ​​of the first resistor and the second resistor are equal.

[0036] In one embodiment, optionally, the seventh resistor and the eighth resistor have the same resistance value, and the fourth capacitor and the fifth capacitor have the same capacitance value.

[0037] In a second aspect, an embodiment of the utility model provides an energy storage system, which is used for the energy storage converter described in any one of the embodiments of the first aspect.

[0038] In the scheme implemented by the above energy storage converter and energy storage system, the energy storage converter includes: a shunt, a reverse amplifier circuit, a voltage boosting circuit, a Butterworth filter circuit, and an ADC sampling module; the shunt is used to shunt the current output by the battery and then input a voltage signal to the reverse amplifier circuit; the reverse amplifier circuit is connected to the shunt and is used to amplify the voltage signal and output the amplified voltage signal; the voltage boosting circuit is connected to the reverse amplifier circuit and is used to bias the amplified voltage signal to obtain a bias voltage; the Butterworth filter circuit is connected to the voltage boosting circuit and is used to filter the bias voltage to obtain a filtered voltage signal; the ADC sampling module is connected to the Butterworth filter circuit and is used to perform analog-to-digital conversion on the filtered voltage signal and output it to the controller. In the utility model, filtering is performed through a Butterworth filter circuit, so that the frequency response curve in the passband can be maximally flat without ripples, and the characteristic of gradually decreasing to zero in the stopband can effectively filter out high-frequency ripples in the sampling signal and improve the sampling accuracy. The sampling data deviation after software calibration is extremely small, which can provide more accurate data feedback for the controller, promote the system to work efficiently, and meet the needs of mass production.

Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A structural schematic diagram of an energy storage converter in the related art is shown.

[0041] Figure 2 A schematic block diagram of an energy storage converter according to an embodiment of the utility model is shown.

[0042] Figure 3 A circuit diagram of an energy storage converter according to an embodiment of the utility model is shown. [Specific implementation method]

[0043] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0044] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0046] In order to solve the technical problems in the related art that the sampling equipment with filtering function is high in cost and does not meet the needs of mass production, the utility model proposes an energy storage converter and an energy storage system.

[0047] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0048] See also Figure 2 , Figure 2 A schematic block diagram of an energy storage converter according to an embodiment of the utility model is shown. The energy storage converter is used to solve the technical problem that the high-frequency ripple cannot be filtered out in the related art to affect the normal operation of the equipment.

[0049] like Figure 2 As shown, an energy storage converter according to an embodiment of the utility model includes:

[0050] A current divider 11, an inverse amplifier circuit 12, a voltage boost circuit 13, a Butterworth filter circuit 14, and an ADC sampling module 15;

[0051] The shunt 11 is used to shunt the current output by the battery and then input a voltage signal to the reverse amplifier circuit; when a positive current passes through the shunt 11, according to the characteristics of the shunt itself, the large current signal is converted into a positive small voltage signal output, and when a negative current passes through, a negative small voltage signal is output. Assuming that the shunt resistance is R and the current passing through the shunt is I, then U R =I*R.

[0052] The reverse amplifier circuit 12 is connected to the shunt 11 and is used to amplify the voltage signal and output the amplified voltage signal;

[0053] The voltage boosting circuit 13 is connected to the reverse amplifier circuit 12 and is used to bias the amplified voltage signal to obtain a bias voltage;

[0054] The Butterworth filter circuit 14 is connected to the voltage boost circuit 13 and is used to filter the bias voltage to obtain a filtered voltage signal;

[0055] The ADC sampling module 15 is connected to the Butterworth filter circuit 14 and is used for performing analog-to-digital conversion on the filtered voltage signal and outputting the result to the controller.

[0056] like Figure 3 As shown, in one embodiment, optionally, the reverse amplifier circuit 12 includes:

[0057] A first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2 and a first operational amplifier U1;

[0058] Wherein, the first resistor R1 is connected to the non-inverting input terminal of the first operational amplifier U1, and the second resistor R2 is connected to the reverse input terminal of the first operational amplifier U1;

[0059] The third resistor R3 and the first capacitor C1 are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier U1;

[0060] The fourth resistor R4 is connected to the output end of the first operational amplifier U1 to limit the current of the amplified voltage signal output by the first operational amplifier U1;

[0061] One end of the second capacitor C2 is connected to the fourth resistor R4 , and the other end is grounded, so as to filter the amplified voltage signal output by the first operational amplifier U1 .

[0062] In one embodiment, optionally, the voltage boosting circuit 13 includes:

[0063] A fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a second operational amplifier U2;

[0064] One end of the fifth resistor R5 is connected between the fourth resistor R4 and the second capacitor C2, and the other end is respectively connected to one end of the sixth resistor R6, one end of the third capacitor C3 and the same-direction input end of the second operational amplifier U2;

[0065] One end of the sixth resistor R6 is connected to the fifth resistor R5 and the same-inverting input end of the second operational amplifier U2, and the other end is connected to the power supply VCC;

[0066] One end of the third capacitor C3 is connected to the fifth resistor R5, and the other end is grounded GND, for filtering output noise;

[0067] The inverting input terminal of the second operational amplifier U2 is short-circuited to its output terminal;

[0068] In one embodiment, optionally, the sixth resistor R6 is a bias resistor, and divides the power supply voltage together with the fifth resistor R5.

[0069] Among them, R5 is the input resistor of the same-direction end of the operational amplifier, and it also plays a voltage divider role together with R6, and forms an RC filter circuit with C3 to filter the output noise of the circuit; R6 is the Vcc bias resistor, and it also plays a voltage divider role together with R5.

[0070] The signals output by the reverse amplifier circuit are both positive and negative. Based on the superposition theorem, the voltage signals are uniformly biased to above 0V; let R5=R6, then the output of the bias circuit is Uo1=0.5*(Uo+Vcc).

[0071] In one embodiment, optionally, the Butterworth filter circuit 14 includes:

[0072] A seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6 and a third operational amplifier U3;

[0073] One end of the seventh resistor R7 is connected to the output end of the second operational amplifier U2, and the other end is connected to the eighth resistor R8;

[0074] One end of the eighth resistor R8 is connected to the seventh resistor R7 and one end of the fourth capacitor C4 respectively, and the other end is connected to the fifth capacitor C5 and the same-direction input end of the third operational amplifier U3 respectively;

[0075] One end of the ninth resistor R9 is connected to the output end of the third operational amplifier U3, and the other end is connected to the sixth capacitor C6 and the ADC sampling module 15 respectively;

[0076] One end of the fourth capacitor C4 is connected between the seventh resistor R7 and the eighth resistor R8, and the other end is connected to the output end of the third operational amplifier U3;

[0077] One end of the fifth capacitor C5 is connected to the non-inverting input terminal of the third operational amplifier U3, and the other end is grounded;

[0078] One end of the sixth capacitor C6 is connected between the ninth resistor R9 and the ADC sampling module 15, and the other end is grounded GND;

[0079] The inverting input terminal of the third operational amplifier U3 is short-circuited to its output terminal.

[0080] In one embodiment, optionally, the fourth capacitor C4 is used to feed back the signal output by the third operational amplifier U3, and the fifth capacitor C5 is used to filter the signal input to the third operational amplifier U3.

[0081] In one embodiment, optionally, the ninth resistor R9 and the sixth capacitor C6 form a first-order filter circuit for filtering output noise.

[0082] In one embodiment, optionally, the resistance values ​​of the first resistor R1 and the second resistor R2 are equal.

[0083] In this embodiment, the small voltage signal is amplified by the reverse amplifier circuit; let R1 = R2, then the output Uo of the reverse amplifier circuit = -U R *(R3 / R1)

[0084] In one embodiment, optionally, the seventh resistor R7 and the eighth resistor R8 have the same resistance value, and the fourth capacitor C4 and the fifth capacitor C5 have the same capacitance value.

[0085] In this embodiment, the biased signal is processed by a Butterworth low-pass filter circuit. Let R7 = R8, C5 = C4, then the filter cutoff frequency f = 1 / (2*π*R7*C4). When R7 = R8, C4 = C5, the circuit is also called a Sallen-Key circuit.

[0086] Through the above-mentioned technical scheme of the utility model, filtering is performed through the Butterworth filter circuit, so that the frequency response curve in the passband can be maximally flat and free of ripples, while the characteristic of gradually decreasing to zero in the stopband can effectively filter out high-frequency ripples in the sampling signal and improve the sampling accuracy. The sampling data deviation after software calibration is extremely small, which can provide more accurate data feedback for the controller, promote the efficient operation of the system, and meet the needs of mass production.

[0087] In a second aspect, an energy storage system is provided, which is used for the energy storage converter described in any one of the embodiments of the first aspect.

[0088] It is understandable that the composition of the ADC sampling circuit, the selection of each component, and the signal type of the voltage signal can be selected and set according to the actual scenario of production design, and this embodiment does not make specific limitations.

[0089] It should be noted that the circuit function of the energy storage converter provided in this embodiment is mainly realized by the circuit connection relationship between the various circuit modules, and does not rely on the program module in a certain circuit module. In addition, each circuit module in the energy storage converter can be realized by an analog circuit or a digital circuit, and for the circuit module that can be implanted with a program module, the realization of its module function can be realized by the program module provided by the prior art.

[0090] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0091] It should be understood that, although the terms first, second, etc. may be used to describe the setting units in the embodiments of the present invention, these setting units should not be limited to these terms. These terms are only used to distinguish the setting units from each other. For example, without departing from the scope of the embodiments of the present invention, the first setting unit may also be referred to as the second setting unit, and similarly, the second setting unit may also be referred to as the first setting unit.

[0092] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0093] In the several embodiments provided by the present utility model, it should be understood that the disclosed systems, systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or units, which can be electrical, mechanical or other forms.

[0094] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0095] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An energy storage converter, characterized in that: include: Shunt, reverse amplifier circuit, voltage boost circuit, Butterworth filter circuit, ADC sampling module; The shunt is used to shunt the current output by the battery and then input a voltage signal to the reverse amplifier circuit; The reverse amplifier circuit is connected to the shunt and is used to amplify the voltage signal and output the amplified voltage signal; The voltage boosting circuit is connected to the reverse amplifier circuit and is used to bias the amplified voltage signal to obtain a bias voltage; The Butterworth filter circuit is connected to the voltage boost circuit and is used to filter the bias voltage to obtain a filtered voltage signal; The ADC sampling module is connected to the Butterworth filter circuit and is used for performing analog-to-digital conversion on the filtered voltage signal and outputting the converted signal to the controller.

2. The energy storage converter according to claim 1, characterized in that: The reverse amplifier circuit comprises: A first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a first operational amplifier; Wherein, the first resistor is connected to the non-inverting input terminal of the first operational amplifier, and the second resistor is connected to the inverting input terminal of the first operational amplifier; The third resistor and the first capacitor are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier; The fourth resistor is connected to the output end of the first operational amplifier to limit the current of the amplified voltage signal output by the first operational amplifier; One end of the second capacitor is connected to the fourth resistor, and the other end is grounded, so as to filter the amplified voltage signal output by the first operational amplifier.

3. The energy storage converter according to claim 2, characterized in that: The voltage boosting circuit comprises: a fifth resistor, a sixth resistor, a third capacitor, and a second operational amplifier; One end of the fifth resistor is connected between the fourth resistor and the second capacitor, and the other end is respectively connected to one end of the sixth resistor, one end of the third capacitor and the non-inverting input end of the second operational amplifier; One end of the sixth resistor is connected to the fifth resistor and the same-inverting input end of the second operational amplifier, and the other end is connected to the power supply; One end of the third capacitor is connected to the fifth resistor, and the other end is grounded, for filtering output noise; The inverting input terminal of the second operational amplifier is short-circuited to the output terminal thereof.

4. The energy storage converter according to claim 3, characterized in that: The sixth resistor is a bias resistor, and divides the power supply voltage together with the fifth resistor.

5. The energy storage converter according to claim 3, characterized in that: The Butterworth filter circuit comprises: a seventh resistor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a third operational amplifier; One end of the seventh resistor is connected to the output end of the second operational amplifier, and the other end is connected to the eighth resistor; One end of the eighth resistor is connected to the seventh resistor and one end of the fourth capacitor respectively, and the other end is connected to the fifth capacitor and the same-direction input end of the third operational amplifier respectively; One end of the ninth resistor is connected to the output end of the third operational amplifier, and the other end is connected to the sixth capacitor and the ADC sampling module respectively; One end of the fourth capacitor is connected between the seventh resistor and the eighth resistor, and the other end is connected to the output end of the third operational amplifier; One end of the fifth capacitor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded; One end of the sixth capacitor is connected between the ninth resistor and the ADC sampling module, and the other end is grounded; The inverting input terminal of the third operational amplifier is short-circuited to the output terminal thereof.

6. The energy storage converter according to claim 5, characterized in that: The fourth capacitor is used to feed back the signal output by the third operational amplifier, and the fifth capacitor is used to filter the signal input to the third operational amplifier.

7. The energy storage converter according to claim 5, characterized in that: The ninth resistor and the sixth capacitor form a first-order filter circuit for filtering output noise.

8. The energy storage converter according to claim 2, characterized in that: The resistance values ​​of the first resistor and the second resistor are equal.

9. The energy storage converter according to claim 5, characterized in that: The seventh resistor and the eighth resistor have the same resistance value, and the fourth capacitor and the fifth capacitor have the same capacitance value.

10. An energy storage system, characterized in that: include: An energy storage converter according to any one of claims 1 to 9.

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