CN216751217U - Pre-charging circuit applied to direct-current bus capacitor and energy storage equipment - Google Patents
Pre-charging circuit applied to direct-current bus capacitor and energy storage equipment Download PDFInfo
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- CN216751217U CN216751217U CN202122752431.1U CN202122752431U CN216751217U CN 216751217 U CN216751217 U CN 216751217U CN 202122752431 U CN202122752431 U CN 202122752431U CN 216751217 U CN216751217 U CN 216751217U
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Abstract
The utility model is suitable for the field of power supplies, and relates to a pre-charging circuit and energy storage equipment applied to a direct-current bus capacitor.
Description
Technical Field
The application belongs to the power field, especially relates to a be applied to DC bus capacitance's pre-charge circuit and energy storage equipment.
Background
When energy storage equipment works in the service environment of direct current input hot plug, in order to prevent that input voltage from giving bus capacitor charge in the twinkling of an eye the damage of heavy current to the circuit, can increase a pre-charge circuit at circuit generating line usually, pre-charge circuit includes the current-limiting resistor who establishes ties with bus capacitor, and the relay parallelly connected with current-limiting resistor, through the input voltage of software sampling electric capacity both ends voltage and direct current bus, contrast the pressure differential between input voltage and the electric capacity both ends voltage, after pressure differential is less than a definite value, actuation relay, realize the connection of circuit through the relay.
However, the conventional pre-charging circuit usually needs to introduce a relay, and has the problems of large volume and large occupied circuit board space.
SUMMERY OF THE UTILITY MODEL
The utility model provides a precharge circuit and energy storage equipment for direct current bus capacitance, aim at solving current precharge circuit and lead to the great problem of volume owing to introduced the relay.
The first aspect of the embodiments of the present application provides a precharge circuit applied to a dc bus capacitor, where the precharge circuit includes:
the pre-charging current-limiting circuit is connected with the direct current bus capacitor in series;
the voltage amplifying circuit is connected with the pre-charging current-limiting circuit and is used for detecting the voltage difference at two ends of the pre-charging current-limiting circuit and amplifying the voltage difference to generate a detection voltage signal;
the comparison driving circuit is connected with the voltage amplifying circuit, and is used for receiving the detection voltage signal, outputting a turn-off signal when the detection voltage signal is greater than a reference voltage signal, and outputting a turn-on signal when the detection voltage signal is less than or equal to the reference voltage signal;
the switching circuit is connected in parallel with two ends of the pre-charging current-limiting circuit, and the control end of the switching circuit is connected with the comparison driving circuit; the switch circuit is used for switching off when receiving the switching-off signal and switching on when receiving the switching-on signal so as to bypass the pre-charging current-limiting circuit.
In one embodiment, the pre-charging current-limiting circuit comprises at least one current-limiting resistor, and each current-limiting resistor is connected in series with the dc bus capacitor.
In one embodiment, the switching circuit includes: the first end of the first switch tube is connected between the direct current bus capacitor and the pre-charging current-limiting circuit; the first end of the first resistor is connected with the control end of the first switch tube and the output end of the comparison driving circuit, and the second end of the first resistor is connected with the second end of the first switch tube and grounded.
In one embodiment, the voltage amplification circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a fourth resistor, a first operational amplifier, a fifth resistor, a second capacitor and a sixth resistor; the first end of the second resistor is connected with the first end of the pre-charging current-limiting circuit, and the second end of the second resistor is connected with the positive phase input end of the first operational amplifier; the first end of the third resistor is connected with the second end of the pre-charging current-limiting circuit, and the second end of the third resistor is connected with the negative phase input end of the first operational amplifier; the first end of the first capacitor is connected with the positive phase input end of the first operational amplifier, and the second end of the first capacitor is grounded; the fourth resistor is connected with the first capacitor in parallel; a first end of the fifth resistor is connected with a negative phase input end of the first operational amplifier, and a second end of the fifth resistor is connected with an output end of the first operational amplifier; the second capacitor is connected with the fifth resistor in parallel; and a first end of the sixth resistor is connected with the output end of the first operational amplifier, and a second end of the sixth resistor is connected with the comparison driving circuit.
In one embodiment, the pre-charge circuit further comprises a reference voltage circuit for providing a reference voltage signal to the comparison drive circuit.
In one embodiment, the comparison driving circuit includes:
the voltage comparison unit is connected with the voltage amplification circuit and the reference voltage circuit and is used for comparing the detection voltage signal with the reference voltage signal of the reference voltage circuit and outputting a control signal;
the input end of the driving amplification unit is connected with a power supply, the control end of the driving amplification unit is connected with the output end of the voltage comparison unit, and the output end of the driving amplification unit is connected with the switch circuit; the driving amplification unit is used for amplifying the turn-off signal or the turn-on signal output by the voltage comparison unit and then outputting the amplified turn-off signal or the turn-on signal to the switch circuit.
In one embodiment, the voltage comparing unit includes: the voltage amplifying circuit comprises a second operational amplifier, a ninth resistor and a tenth resistor, wherein the inverting input end of the second operational amplifier is connected with the voltage amplifying circuit, and the non-inverting input end of the second operational amplifier is connected with the reference voltage circuit; the first end of the ninth resistor is connected with the output end of the second operational amplifier, the second end of the ninth resistor is connected with the driving amplification unit, the first end of the tenth resistor is connected with the driving amplification unit, and the second end of the tenth resistor is grounded.
In one embodiment, the driving amplification unit includes: and the first end of the second switch tube is connected with the power supply, the second end of the second switch tube is connected with the switch circuit, and the control end of the second switch tube is connected with the voltage comparison unit.
In one embodiment, the precharge circuit further comprises:
and the auxiliary power supply circuit is respectively connected with the voltage amplifying circuit and the comparison driving circuit and is used for supplying power to the voltage amplifying circuit and the comparison driving circuit.
A second aspect of the embodiment of the present application further provides an energy storage device, which includes a photovoltaic interface, a dc bus capacitor, a voltage conversion circuit, and a precharge circuit according to any one of the embodiments; the photovoltaic interface is connected with the voltage conversion circuit through the direct current bus, and the voltage conversion circuit is used for performing voltage conversion on input voltage of the photovoltaic interface to obtain target voltage and outputting the target voltage; the direct current bus capacitor is connected in series between the positive direct current bus and the negative direct current bus.
The embodiment of the application provides a pre-charging circuit and energy storage equipment applied to a direct-current bus capacitor, the pre-charging circuit comprises a pre-charging current-limiting circuit, a voltage amplifying circuit, a comparison driving circuit and a switch circuit, the pre-charging current-limiting circuit is connected with the direct-current bus capacitor, the voltage amplifying circuit is connected with the pre-charging current-limiting circuit and used for amplifying voltage signals at two ends of the pre-charging current-limiting circuit and then outputting detection voltage signals, the comparison driving circuit is used for comparing the detection voltage signals with reference voltage signals and generating on signals or off signals according to comparison results so as to control the on and off of the switch circuit, the purpose of protecting the circuit when large current is input is achieved, and the problem that the size of the existing pre-charging circuit is large due to the introduction of a relay is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a functional block diagram of a precharge circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a pre-charge current-limiting circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic circuit diagram of a switching circuit provided in an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a voltage amplifying circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic circuit diagram of a reference voltage circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of a comparison driving circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram of a precharge circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In a dc voltage conversion circuit, a dc bus capacitor is usually connected in series between the positive and negative dc buses of the power input terminal as an energy storage element. The power input end is used for being connected with a direct current source, and the direct current source can be a direct current source converted by an inverter and can also be a direct current source such as PV (photovoltaic) and the like. In the service environment supporting direct current input hot plug, in order to prevent the damage of the direct current bus capacitor caused by the instantaneous large current when the input large voltage is charged, a current limiting resistor is usually added in front of the direct current bus capacitor, the current limiting resistor is connected with a relay in parallel, then the voltage at two ends of the capacitor and the voltage at an input end are sampled through software, the input voltage and the differential pressure at two ends of the capacitor are compared, and when the differential pressure is smaller than a certain value, the relay is attracted, so that the circuit is connected through the relay.
In practical application, however, the manufacturing cost is high after the relay is added in the pre-charging circuit, and the size of the relay is large, so that the space of the circuit is occupied.
In order to solve the above technical problem, an embodiment of the present invention provides a pre-charge circuit applied to a dc bus capacitor, and fig. 1 is a functional block diagram of the pre-charge circuit applied to the dc bus capacitor provided in the embodiment of the present invention, and as shown in fig. 1, the pre-charge circuit in the embodiment includes a pre-charge current limiting circuit 101, a voltage amplifying circuit 103, a comparison driving circuit 104, and a switch circuit 102.
In this embodiment, the pre-charge current-limiting circuit 101 is connected in series with the dc bus capacitor Cs, specifically, a first end of the dc bus capacitor Cs is connected to the positive electrode Vin + of the input voltage source, a second end of the dc bus capacitor Cs is connected to the first end of the pre-charge current-limiting circuit 101, a second end of the pre-charge current-limiting circuit 101 is connected to the negative electrode Vin-, and the voltage amplification circuit 103 is connected to the pre-charge current-limiting circuit 101, and the voltage amplification circuit 103 is configured to detect a voltage VR1 at two ends of the pre-charge current-limiting circuit 101 and amplify a voltage VR1 at two ends of the pre-charge current-limiting circuit 101, so as to generate a detected voltage signal V1.
The comparison driving circuit 104 is connected to the voltage amplifying circuit 103, and the comparison driving circuit 104 is configured to compare the voltage magnitudes of the detection voltage signal V1 and the reference voltage signal Vref, and output an off signal or an on signal according to the comparison result, for example, the reference voltage signal Vref may be provided by the reference voltage circuit, if the detection voltage signal V1 is greater than the reference voltage signal Vref, the comparison driving circuit 104 outputs the off signal to the switch circuit 102, and if the detection voltage signal V1 is less than or equal to the reference voltage signal Vref, the comparison driving circuit 104 outputs the on signal to the switch circuit 102.
The switch circuit 102 is connected in parallel to two ends of the pre-charge current-limiting circuit 101, and a control end thereof is connected to the comparison driving circuit 104. Specifically, when the comparison drive circuit 104 outputs an off signal, the switch circuit 102 is turned off when receiving the off signal, and when the comparison drive circuit 104 outputs an on signal, the switch circuit 102 is turned on when receiving the on signal to bypass the pre-charge current limiting circuit 101.
As shown in fig. 1, the voltage across the pre-charge current-limiting circuit 101 is amplified by the voltage amplifying circuit 103 to generate the detection voltage signal V1. When the detection voltage signal V1 is greater than the reference voltage signal Vref, the comparison driving circuit 104 outputs a turn-off signal to the switch circuit 102, the switch circuit 102 is turned off, and the input voltage flows into the ground through the dc bus capacitor Cs and the pre-charge current-limiting circuit 101, so that the dc bus capacitor Cs is charged. When the detection voltage signal V1 is less than or equal to the reference voltage signal Vref, the comparison driving circuit 104 outputs a turn-on signal to the switch circuit 102, the switch circuit 102 is turned on, the input voltage flows into the ground through the dc bus capacitor Cs and the switch circuit 102 and does not pass through the pre-charge current-limiting circuit 101 any more, and at this time, the charging of the dc bus capacitor Cs is completed, so that the purpose of protecting the circuit when an instantaneous large current is input is achieved without introducing a relay. In addition, in this embodiment, only the voltages at the two ends of the pre-charge current-limiting circuit 101 need to be detected, and synchronous sampling of the input voltage is not required, so that the circuit design can be simplified, and the cost can be reduced.
In one embodiment, the voltage of the reference voltage signal Vref may be a voltage difference between two ends of the pre-charging current limiting circuit 101 when the dc bus capacitor Cs is pre-charged. When the pre-charging of the dc bus capacitor Cs is not completed, the voltage difference between the two ends of the dc bus capacitor Cs increases in a curve along with the pre-charging, and at this time, the voltage difference on the pre-charging current-limiting circuit 101 is greater than the reference voltage signal Vref; when the voltage difference between the two ends of the pre-charging current-limiting circuit 101 is detected to be less than or equal to the reference voltage signal Vref, the completion of the pre-charging of the dc bus capacitor Cs can be confirmed, at this time, the comparison driving circuit 104 outputs a conducting signal to the switch circuit 102, and the switch circuit 102 is conducted, so that the pre-charging current-limiting circuit 101 is bypassed, and the pre-charging of the dc bus capacitor Cs is completed.
In one embodiment, the pre-charging current-limiting circuit comprises at least one current-limiting resistor, and each current-limiting resistor is connected with the direct current bus capacitor in series.
For example, referring to fig. 2, the pre-charging current-limiting circuit 101 includes a current-limiting resistor Re, a first end of the current-limiting resistor Re is connected to the dc bus capacitor Cs, and a second end of the current-limiting resistor Re is grounded.
In this embodiment, the maximum charging current of the dc bus capacitor Cs is related to the resistance value of the current-limiting resistor Re and the voltage value of the input voltage source, where the maximum charging current of the dc bus capacitor Cs is Vin/Re, the voltage at two ends of the current-limiting resistor Re is related to the voltage value of the input signal and the voltage value at two ends of the dc bus capacitor Cs, the voltage difference at two ends of the current-limiting resistor Re is Vin-VCs, where VCs is the voltage difference at two ends of the dc bus capacitor Cs, and Vin is the voltage value of the input signal, and therefore when the input voltage is fixed, the voltage at two ends of the current-limiting resistor Re is determined, so that the voltage at two ends of the dc bus capacitor Cs can be known.
In one embodiment, as shown in fig. 3, the switching circuit 102 includes a first switching tube Q1 and a first resistor R1, a first end of the first switching tube Q1 is connected to a common node between the dc bus capacitor Cs and the pre-charge current-limiting circuit 101; a first end of the first resistor R1 is connected to the control end of the first switch transistor Q1 and the output end of the comparison driving circuit 104, and a second end of the first resistor R1 is connected to the second end of the first switch transistor Q1 and grounded.
For example, as shown in fig. 3, the first switch Q1 is an N-type MOS transistor, the gate of the first switch Q1 is connected to the first end of the first resistor R1 and the comparison driving circuit 104, the drain of the first switch Q1 is connected between the dc bus capacitor Cs and the pre-charge current-limiting circuit 101, and the source of the first switch Q1 and the second end of the first resistor R1 are commonly connected to the ground and commonly connected to the negative Vin-electrode of the input voltage source.
In this embodiment, the control terminal of the first switch Q1 receives an off signal or an on signal from the comparison driving circuit 104, and the off signal or the on signal is respectively used for controlling the on and off of the first switch Q1.
When the first switching tube Q1 receives a turn-off signal, the first switching tube Q1 is turned off, and the input voltage flows through the dc bus capacitor Cs and the current-limiting resistor Re and flows into the ground or the negative Vin-of the input voltage source, at this time, the input voltage charges the dc bus capacitor Cs; when the first switch tube Q1 receives the on signal, the first switch tube Q1 is in an on state, and the input voltage does not charge the dc bus capacitor Cs.
In one embodiment, referring to fig. 4, the voltage amplifying circuit 103 adopts a differential amplifying circuit structure, and specifically includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, and a first operational amplifier N1. A first end of the second resistor R2 is connected with a first end of the pre-charging current-limiting circuit 101, and a second end of the second resistor R2 is connected with a non-inverting input end of the first operational amplifier N1; a first end of the third resistor R3 is connected with a second end of the pre-charging current-limiting circuit 101, and a second end of the third resistor R3 is connected with a negative phase input end of the first operational amplifier N1; a first end of the first capacitor C1 is connected to the non-inverting input terminal of the first operational amplifier N1, and a second end of the first capacitor C1 is grounded; the fourth resistor R4 is connected in parallel with the first capacitor C1; a first end of the fifth resistor R5 is connected with the negative phase input end of the first operational amplifier N1, and a second end of the fifth resistor R5 is connected with the output end of the first operational amplifier N1; the second capacitor C2 is connected with the fifth resistor R5 in parallel; a first end of the sixth resistor R6 is connected to the output end of the first operational amplifier N1, and a second end of the sixth resistor R6 is connected to the comparison driving circuit 104. The first capacitor C1 and the second capacitor C2 are used for filtering, and the sixth resistor R6 is used for limiting the current flowing into the comparison driving circuit 104.
In this embodiment, the first end of the second resistor R2 and the first end of the third resistor R3 receive voltages from two ends of the pre-charge current-limiting circuit 101 and transmit the voltages to two input ends of the first operational amplifier N1, the first operational amplifier N1 determines a voltage difference between the two input voltages, that is, obtains a voltage difference between two ends of the pre-charge current-limiting circuit 101, and performs gain amplification on the voltage difference, and then outputs a detection voltage signal V1 from an output end of the first operational amplifier N1, the gain multiple of the voltage amplification circuit 103 is R5/R3, and the magnitude of the detection voltage signal V1 is: v1 ═ VR1 × R5/R3, where VR1 is the voltage difference across the pre-charge current-limiting circuit 101.
In one embodiment, referring to fig. 5, the pre-charge circuit further comprises a reference voltage circuit 105, the reference voltage circuit 105 being configured to provide a reference voltage signal Vref to the comparison driving circuit 104. The reference voltage circuit 105 includes an eighth resistor R8, a third capacitor C3, and a seventh resistor R7, wherein a first end of the eighth resistor R8 is connected to the power VCC, a second end of the eighth resistor R8 is connected to the comparison driving circuit 104, a first end of the third capacitor C3 is connected to the comparison driving circuit 104, a second end of the third capacitor C3 is grounded, and the seventh resistor R7 is connected in parallel to the third capacitor C3.
For example, as shown in fig. 5, the first end of the eighth resistor R8 is connected to the power source VCC, the second end of the eighth resistor R8, the first end of the seventh resistor, and the first end of the third capacitor C3 are connected to the comparison driving circuit 104, the voltage of the power source VCC is divided by the eighth resistor R8 and the seventh resistor R7, and the output voltage, that is, the magnitude of the reference voltage signal Vref, can be adjusted by adjusting the resistances of the seventh resistor R7 and the eighth resistor R8.
In one embodiment, referring to fig. 6, the comparison driving circuit 104 includes a voltage comparison unit 401 and a driving amplification unit 402. The voltage comparison unit 401 is connected to the voltage amplification circuit 103 and the reference voltage circuit 105, and compares the magnitude of the detection voltage signal V1 with the magnitude of the reference voltage signal Vref output by the reference voltage circuit 105 to output a control signal.
The input end of the driving amplification unit 402 is connected with a power supply VCC, the control end of the driving amplification unit 402 is connected with the output end of the voltage comparison unit 401, and the output end of the driving amplification unit 402 is connected with the switch circuit 102; the driving amplifying unit 402 is configured to amplify the turn-off signal or the turn-on signal output by the voltage comparing unit 401 and output the amplified signal to the switch circuit 102.
Specifically, as shown in fig. 6, a first input terminal of the voltage comparing unit 401 is connected to the voltage amplifying circuit 103, and receives the detection voltage signal V1 from the voltage amplifying circuit 103; a second input terminal of the voltage comparison unit 401 is connected to the reference voltage circuit 105 and receives the reference voltage signal Vref from the reference voltage circuit 105, and the voltage comparison unit 401 outputs a control signal to the driving amplification unit 402 by comparing the detection voltage signal V1 and the reference voltage signal Vref. A first terminal of the driving amplification unit 402 receives the control signal from the voltage comparison unit 401, a second terminal of the driving amplification unit 402 is connected to the power source VCC, and switches off or on the reference voltage circuit 105 to the circuit of the switch circuit 102 according to the control signal, thereby outputting a switch-off signal or a switch-on signal to control the switching on and off of the switch circuit 102.
For example, in a specific embodiment, when the detection voltage signal V1 is greater than the reference voltage signal Vref, the voltage comparison unit 401 outputs a low level to the driving amplification unit 402, the driving amplification unit 402 amplifies the low level and outputs the low level to the switching circuit 102, when the detection voltage signal V1 is less than or equal to the reference voltage signal Vref, the voltage comparison unit 401 outputs a high level to the driving amplification unit 402, and the driving amplification unit 402 amplifies the high level and outputs the high level to the switching circuit 102.
In one embodiment, referring to fig. 6, the voltage comparing unit 401 includes a second operational amplifier N2, a non-inverting input terminal of the second operational amplifier N2 is connected to the reference voltage circuit 105, and an inverting input terminal of the second operational amplifier N2 is connected to the voltage amplifying circuit 103; a first end of the ninth resistor R9 and a first end of the ninth resistor R9 are connected with an output end of the second operational amplifier N2; the tenth resistor R10, a first end of the tenth resistor R10 and a second end of the ninth resistor R9 are connected to the driving amplification unit 402, and a second end of the tenth resistor R10 is grounded.
Specifically, in the present embodiment, the negative phase input terminal of the second operational amplifier N2 inputs the detection voltage signal V1, the positive phase input terminal of the second operational amplifier N2 inputs the reference voltage signal Vref through the eighth resistor R8, and when the detection voltage signal V1 is greater than the reference voltage signal Vref, the second operational amplifier N2 outputs a control signal with a low level to the first terminal of the ninth resistor R9.
In one embodiment, referring to fig. 6, the driving amplifying unit 402 includes a second switching tube Q2, a first terminal of the second switching tube Q2 is connected to the power VCC, a first terminal of the second switching tube Q2 is connected to the switching circuit 102, and a control terminal of the second switching tube Q2 is connected to the voltage comparing unit 401.
Specifically, in this embodiment, the control terminal of the second switch Q2 is connected to the output terminal of the voltage comparing unit 401 and receives the off signal or the on signal from the voltage comparing unit 401, and the second switch Q2 amplifies the off signal or the on signal at the control terminal and outputs the amplified signal to the switch circuit 102.
In one embodiment, the second switch Q2 is an NPN transistor, the second switch Q2 is powered by the power VCC, and the NPN transistor is configured to amplify the off signal or the on signal and output the amplified off signal or the amplified on signal to the switch circuit 102.
In one embodiment, the pre-charge circuit further comprises an auxiliary power circuit 106, as shown in fig. 7, the auxiliary power circuit 106 is used for supplying power to the voltage amplification circuit 103, the comparison driving circuit 104 and the reference voltage circuit 105.
In this embodiment, the auxiliary power circuit 106 may be a dc conversion circuit for performing voltage conversion on the input signal and generating the power VCC.
In this embodiment, the first terminal of the auxiliary power circuit 106 is connected to the positive terminal Vin + of the input voltage source, the second terminal of the auxiliary power circuit 106 is connected to the negative terminal Vin-of the input voltage source, and the output terminal of the auxiliary power circuit 106 outputs the power signal.
For example, as shown in fig. 7, the first terminal of the auxiliary power circuit 106 is connected to the first terminal of the dc bus capacitor Cs, the second terminal of the auxiliary power circuit 106 is connected to the negative terminal Vin of the input voltage source, and the output terminal of the auxiliary power circuit 106 is used as a power source VCC, which can supply power to the voltage amplifying circuit 103, the comparison driving circuit 104, and the reference voltage circuit 105.
In the present embodiment, the auxiliary power supply circuit 106 generates a power supply signal to power the first operational amplifier N1 and the second operational amplifier N2 based on the input voltage provided by the positive electrode Vin + of the input voltage source.
Another aspect of the embodiments of the present application provides an energy storage device, where the energy storage device includes a photovoltaic interface, a dc bus resistor, a voltage conversion circuit, and a precharge circuit according to any one of the embodiments.
In this embodiment, the photovoltaic interface is connected to the voltage conversion circuit through the dc bus, and the voltage conversion circuit is configured to perform voltage conversion on an input voltage of the photovoltaic interface to obtain a target voltage and output the target voltage; the direct current bus capacitor is connected in series between the positive direct current bus and the negative direct current bus.
It is obvious to those skilled in the art that for convenience and simplicity of description, the foregoing functional units and circuits are merely illustrated in terms of division, and in practical applications, the above functions may be distributed as different functional units and circuits according to needs, that is, the internal structure of the device is divided into different functional units or circuits to complete all or part of the above described functions. In the embodiments, each functional unit and each circuit may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and circuits are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and circuits in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A pre-charging circuit applied to a direct current bus capacitor is characterized by comprising:
the pre-charging current-limiting circuit is connected with the direct current bus capacitor in series;
the voltage amplifying circuit is connected with the pre-charging current-limiting circuit and is used for detecting the voltage difference at two ends of the pre-charging current-limiting circuit and amplifying the voltage difference to generate a detection voltage signal;
the comparison driving circuit is connected with the voltage amplifying circuit, and is used for receiving the detection voltage signal, outputting a turn-off signal when the detection voltage signal is greater than a reference voltage signal, and outputting a turn-on signal when the detection voltage signal is less than or equal to the reference voltage signal;
the switching circuit is connected in parallel with two ends of the pre-charging current-limiting circuit, and the control end of the switching circuit is connected with the comparison driving circuit; the switch circuit is used for switching off when receiving the switching-off signal and switching on when receiving the switching-on signal so as to bypass the pre-charging current-limiting circuit.
2. The pre-charge circuit of claim 1, wherein the pre-charge current-limiting circuit comprises at least one current-limiting resistor, each current-limiting resistor being connected in series with the dc bus capacitor.
3. The precharge circuit of claim 1, wherein the switch circuit comprises: the first end of the first switch tube is connected between the direct current bus capacitor and the pre-charging current-limiting circuit; the first end of the first resistor is connected with the control end of the first switch tube and the output end of the comparison driving circuit, and the second end of the first resistor is connected with the second end of the first switch tube and grounded.
4. The precharge circuit as claimed in claim 1, wherein said voltage amplification circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a fourth resistor, a first operational amplifier, a fifth resistor, a second capacitor and a sixth resistor;
the first end of the second resistor is connected with the first end of the pre-charging current-limiting circuit, and the second end of the second resistor is connected with the positive phase input end of the first operational amplifier; the first end of the third resistor is connected with the second end of the pre-charging current-limiting circuit, and the second end of the third resistor is connected with the negative phase input end of the first operational amplifier; the first end of the first capacitor is connected with the positive phase input end of the first operational amplifier, and the second end of the first capacitor is grounded; the fourth resistor is connected with the first capacitor in parallel; a first end of the fifth resistor is connected with a negative phase input end of the first operational amplifier, and a second end of the fifth resistor is connected with an output end of the first operational amplifier; the second capacitor is connected with the fifth resistor in parallel; and a first end of the sixth resistor is connected with the output end of the first operational amplifier, and a second end of the sixth resistor is connected with the comparison driving circuit.
5. The precharge circuit as claimed in claim 1, wherein the precharge circuit further comprises:
a reference voltage circuit for providing a reference voltage signal to the compare driver circuit.
6. The precharge circuit as claimed in claim 5, wherein said comparison drive circuit comprises:
the voltage comparison unit is connected with the voltage amplification circuit and the reference voltage circuit and is used for comparing the detection voltage signal with the reference voltage signal of the reference voltage circuit and outputting a control signal;
the input end of the driving amplification unit is connected with a power supply, the control end of the driving amplification unit is connected with the output end of the voltage comparison unit, and the output end of the driving amplification unit is connected with the switch circuit; the driving amplification unit is used for amplifying the turn-off signal or the turn-on signal output by the voltage comparison unit and then outputting the amplified turn-off signal or the turn-on signal to the switch circuit.
7. The precharge circuit as claimed in claim 6, wherein the voltage comparison unit includes: the voltage amplifying circuit comprises a second operational amplifier, a ninth resistor and a tenth resistor, wherein the inverting input end of the second operational amplifier is connected with the voltage amplifying circuit, and the non-inverting input end of the second operational amplifier is connected with the reference voltage circuit; the first end of the ninth resistor is connected with the output end of the second operational amplifier, the second end of the ninth resistor is connected with the driving amplification unit, the first end of the tenth resistor is connected with the driving amplification unit, and the second end of the tenth resistor is grounded.
8. The precharge circuit as claimed in claim 6, wherein said drive amplifying unit comprises: and the first end of the second switch tube is connected with the power supply, the second end of the second switch tube is connected with the switch circuit, and the control end of the second switch tube is connected with the voltage comparison unit.
9. The precharge circuit as claimed in claim 1, wherein the precharge circuit further comprises:
and the auxiliary power supply circuit is respectively connected with the voltage amplifying circuit and the comparison driving circuit and is used for supplying power to the voltage amplifying circuit and the comparison driving circuit.
10. An energy storage device, comprising a photovoltaic interface, a dc bus capacitor and a voltage conversion circuit, and further comprising a pre-charge circuit according to any one of claims 1 to 9; the photovoltaic interface is connected with the voltage conversion circuit through the direct current bus, and the voltage conversion circuit is used for performing voltage conversion on input voltage of the photovoltaic interface to obtain target voltage and outputting the target voltage; the direct current bus capacitor is connected in series between the positive direct current bus and the negative direct current bus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122752431.1U CN216751217U (en) | 2021-11-09 | 2021-11-09 | Pre-charging circuit applied to direct-current bus capacitor and energy storage equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122752431.1U CN216751217U (en) | 2021-11-09 | 2021-11-09 | Pre-charging circuit applied to direct-current bus capacitor and energy storage equipment |
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| CN216751217U true CN216751217U (en) | 2022-06-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115912903A (en) * | 2022-11-30 | 2023-04-04 | 捷蒽迪电子科技(上海)有限公司 | Series capacitor buck converter with pre-charging circuit |
| CN117118038A (en) * | 2023-10-24 | 2023-11-24 | 深圳市首航新能源股份有限公司 | Pre-charging circuit and power supply equipment |
-
2021
- 2021-11-09 CN CN202122752431.1U patent/CN216751217U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115912903A (en) * | 2022-11-30 | 2023-04-04 | 捷蒽迪电子科技(上海)有限公司 | Series capacitor buck converter with pre-charging circuit |
| CN117118038A (en) * | 2023-10-24 | 2023-11-24 | 深圳市首航新能源股份有限公司 | Pre-charging circuit and power supply equipment |
| CN117118038B (en) * | 2023-10-24 | 2024-02-23 | 深圳市首航新能源股份有限公司 | Pre-charging circuit and power supply equipment |
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