CN221467563U - Voltage limiting isolation circuit, energy storage inversion power supply and energy storage inversion system - Google Patents
Voltage limiting isolation circuit, energy storage inversion power supply and energy storage inversion system Download PDFInfo
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- CN221467563U CN221467563U CN202323107004.3U CN202323107004U CN221467563U CN 221467563 U CN221467563 U CN 221467563U CN 202323107004 U CN202323107004 U CN 202323107004U CN 221467563 U CN221467563 U CN 221467563U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 122
- 238000002955 isolation Methods 0.000 title claims abstract description 51
- 238000004804 winding Methods 0.000 claims abstract description 134
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000001629 suppression Effects 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 3
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- 238000007599 discharging Methods 0.000 description 3
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- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The application discloses a voltage limiting isolation circuit, an energy storage inversion power supply and a photovoltaic energy storage inversion system, wherein the voltage limiting isolation circuit comprises an isolation module and a voltage limiting module; the isolation module comprises a first transformer, and a primary winding of the first transformer is used for being connected with the output end of the first DC/AC inverter; the voltage limiting module comprises a second transformer and a voltage limiting unit, wherein a primary winding of the second transformer is connected with a secondary winding of the first transformer in series, the secondary winding of the second transformer is connected with the voltage limiting unit, and the voltage limiting unit can limit the peak value of the pulse voltage of the primary winding of the second transformer to a preset voltage when the peak value of the pulse voltage of the primary winding of the second transformer is larger than a preset threshold voltage. The design can effectively reduce the interference to surrounding circuits, thereby effectively improving the electromagnetic compatibility of the energy storage inverter power supply.
Description
Technical Field
The application relates to the technical field of energy storage inversion power supplies, in particular to a voltage limiting isolation circuit, an energy storage inversion power supply and a photovoltaic energy storage inversion system.
Background
Along with the improvement of the living standard of people, the energy storage inverter power supply is widely applied in order to cope with the situations of power failure, outdoor no power supply, indoor inconvenient wiring and the like.
In the discharging process, the energy storage inverter power supply can convert direct current stored in the battery into alternating current matched with an external load so as to supply power to the external load to enable the external load to work normally.
In the topology structure of the energy storage inverter in the related art, the condition that the peak value of the pulse voltage at two ends of the resonant inductor is far greater than the ideal sinusoidal peak value voltage can occur, the voltage change rate accompanied by the large pulse voltage (namely, the overshoot voltage is formed) is very large, the surrounding circuit is greatly interfered, and the electromagnetic compatibility of the energy storage inverter is reduced.
Disclosure of utility model
The embodiment of the application provides a voltage limiting isolation circuit, an energy storage inversion power supply and a photovoltaic energy storage inversion system, which can solve the problem of poor electromagnetic compatibility of the energy storage inversion power supply caused by overlarge peak value of pulse voltage at two ends of a resonant inductor in the related technology.
In a first aspect, an embodiment of the present application provides a voltage limiting isolation circuit; the voltage limiting isolation circuit is applied to an energy storage inversion power supply, the energy storage inversion power supply comprises an energy storage module and a first DC/AC inverter, and the input end of the first DC/AC inverter is connected with the output end of the energy storage module. The voltage limiting isolation circuit comprises an isolation module and a voltage limiting module; the isolation module comprises a first transformer, and a primary winding of the first transformer is used for being connected with the output end of the first DC/AC inverter; the voltage limiting module comprises a second transformer and a voltage limiting unit, wherein a primary winding of the second transformer is connected with a secondary winding of the first transformer in series, the secondary winding of the second transformer is connected with the voltage limiting unit, and the voltage limiting unit can limit the peak value of the pulse voltage of the primary winding of the second transformer to a preset voltage when the peak value of the pulse voltage of the primary winding of the second transformer is larger than a preset threshold voltage.
According to the voltage limiting isolation circuit provided by the embodiment of the application, when the peak value of the pulse voltage of the primary winding of the second transformer is larger than the threshold voltage, the voltage limiting unit can limit the peak value of the pulse voltage of the primary winding of the second transformer to the preset voltage, and the peak value of the pulse voltage of the primary winding of the second transformer is controlled not to be too large, so that the interference to surrounding circuits is effectively reduced, and the electromagnetic compatibility of the energy storage inverter is effectively improved.
In a second aspect, an embodiment of the present application provides an energy storage inverter power supply; the energy storage inverter power supply comprises a circuit board, an energy storage module, a first DC/AC inverter and the voltage limiting isolation circuit, wherein the voltage limiting isolation circuit is arranged on the circuit board, the input end of the first DC/AC inverter is connected with the output end of the energy storage module, and the output end of the first DC/AC inverter is connected with the primary winding of the first transformer.
The energy storage inverter power supply with the voltage limiting isolation circuit has good electromagnetic compatibility based on the energy storage inverter power supply in the embodiment of the application.
In a third aspect, embodiments of the present application provide a photovoltaic energy storage inverter system; the photovoltaic energy storage inversion system comprises a photovoltaic module and the energy storage inversion power supply, wherein the photovoltaic module is connected with the energy storage inversion power supply.
The photovoltaic energy storage inversion system with the energy storage inversion power supply has good electromagnetic compatibility based on the photovoltaic energy storage inversion system in the embodiment of the application.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an energy storage inverter power supply in the related art;
fig. 2 is a waveform diagram of an overshoot voltage across a resonant inductor in the related art;
FIG. 3 is a schematic diagram of a voltage limiting isolation circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a voltage limiting isolation circuit according to another embodiment of the present application;
FIG. 5 is a waveform diagram of an overshoot voltage on a primary winding of a second transformer according to one embodiment of the present application;
Fig. 6 is a schematic structural diagram of an energy storage inverter according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an energy storage inverter according to another embodiment of the application.
Reference numerals: 1. a voltage limiting isolation circuit; 10. an isolation module; t1, a first transformer; c2, a second capacitor; 20. a pressure limiting module; t2, a second transformer; d1, a first diode; d2, a second diode; r, resistance; c1, a first capacitor; 2. an energy storage inverter power supply; 30. an energy storage module; 40. a first DC/AC inverter; 50. an AC/DC rectifier; 60. a second DC/AC inverter; 3. and (3) loading.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Along with the improvement of the living standard of people, the energy storage inverter power supply is widely applied in order to cope with the situations of power failure, outdoor no power supply, indoor inconvenient wiring and the like.
In the discharging process, the energy storage inverter power supply can convert direct current stored in the battery into alternating current matched with an external load so as to supply power to the external load to enable the external load to work normally.
In the topology structure of the energy storage inverter in the related art, the condition that the peak value of the pulse voltage at two ends of the resonant inductor is far greater than the ideal sinusoidal peak value voltage can occur, the voltage change rate accompanied by the large pulse voltage (namely, the overshoot voltage is formed) is very large, the surrounding circuit is greatly interfered, and the electromagnetic compatibility of the energy storage inverter is reduced.
For example, as shown in fig. 1, fig. 1 is a schematic diagram of a structure of an energy storage inverter power supply in the related art, when the voltage across the resonant inductor L1 'is measured, it is found that there is a large pulse voltage VPLr (i.e. an overshoot voltage) across the resonant inductor L1', and the phenomenon shown in fig. 2 can be seen through simulation. As can be seen from fig. 2, the ideal sinusoidal peak voltage on the resonant inductor L1 'is about 250V (volt, hereinafter simply referred to as "V"), but the peak value of the pulse voltage VPLr can reach about 708V, the peak value of the pulse voltage VPLr is far greater than the ideal sinusoidal peak voltage, so that the insulation requirement on the resonant inductor L1' is greatly improved by the large pulse voltage VPLr, and the voltage change rate accompanied by the large pulse voltage VPLr is very large, so that great interference is formed on surrounding circuits, and the electromagnetic compatibility of the energy storage inverter is reduced.
In order to solve the above-mentioned technical problems, referring to fig. 3-4, a first aspect of the present application proposes a voltage limiting isolation circuit 1, which can effectively reduce the interference to surrounding circuits, thereby effectively improving the electromagnetic compatibility of the energy storage inverter.
The voltage limiting isolation circuit 1 is applied to an energy storage inverter power supply 2 (as shown in fig. 6 and 7), the energy storage inverter power supply 2 comprises an energy storage module 30 and a first DC/AC inverter 40, and an input end of the first DC/AC inverter 40 is connected with an output end of the energy storage module 30. The voltage limiting isolation circuit 1 comprises an isolation module 10 and a voltage limiting module 20; the isolation module 10 comprises a first transformer T1, the primary winding of the first transformer T1 being used for connection with the output of the first DC/AC inverter 40; the voltage limiting module 20 includes a second transformer T2 and a voltage limiting unit, where a primary winding of the second transformer T2 is connected in series with a secondary winding of the first transformer T1, and the secondary winding of the second transformer T2 is connected with the voltage limiting unit, where the voltage limiting unit is capable of limiting a peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 to a preset voltage when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is greater than a preset threshold voltage.
The specific circuit structure of the voltage limiting isolation circuit 1 is described below with reference to fig. 3 to 5.
The energy storage inverter 2 (shown in fig. 6 and 7) is applied to a photovoltaic energy storage inverter system (not shown in the drawings), the photovoltaic energy storage inverter system further comprises a photovoltaic module (not shown in the drawings), an output end of the photovoltaic module is connected with an input end of the energy storage inverter 2, and the photovoltaic module is used for absorbing solar energy from the sun, converting the solar energy into direct current and outputting the direct current to the energy storage inverter 2. The ac output interface of the energy storage inverter 2 is used for connecting with an external load 3 to convert the dc power output by the photovoltaic module into ac power and output the ac power to the external load 3. The "external load 3" may be understood as a device that consumes electric power when operating, and for example, the external load 3 may be, but not limited to, a household appliance such as a refrigerator, an air conditioner, a water heater, or the like. It should be noted that, the energy storage inverter 2 may be connected to one photovoltaic module, or may be connected to a plurality of photovoltaic modules at the same time. The energy storage inverter power source 2 can be portable outdoor mobile energy storage power supply equipment so that after the energy storage inverter power source 2 is charged through the photovoltaic assembly, a user can bring the energy storage inverter power source 2 outdoors to meet the power consumption requirement of the related external load 3.
The energy storage inverter power source 2 includes an energy storage module 30 and a first DC/AC inverter 40.
The energy storage module 30 is used as an element with an energy storage function in the energy storage inverter 2, and the energy storage module 30 can supply power to the external load 3 and can also store energy released by a photovoltaic module (described below) of the photovoltaic energy storage inverter system. The energy storage module 30 includes a battery, a battery management chip, and the like, and the battery may be a storage battery or a lithium battery.
The first DC/AC inverter 40 serves as an element capable of converting direct current into alternating current in the energy storage inverter power source 2.
An input terminal of the first DC/AC inverter 40 is connected to an output terminal of the energy storage module 30, and the first DC/AC inverter 40 is capable of converting direct current output from the energy storage module 30 into alternating current and outputting the alternating current to a first transformer T1 (described below) of the isolation module 10.
As shown in fig. 3, the voltage limiting isolation circuit 1 includes an isolation module 10 and a voltage limiting module 20.
The isolation module 10 serves as a structural member for electrically isolating the voltage on the energy storage module 30 side and the external load 3 side in the voltage limiting isolation circuit 1.
The isolation module 10 comprises a first transformer T1, the primary winding of the first transformer T1 being adapted to be connected to the output of a first DC/AC inverter 40.
The voltage limiting module 20 is used as a structure for limiting the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 (described below) in the voltage limiting isolation circuit 1 to be too large (i.e., to form an overshoot voltage).
The voltage limiting module 20 includes a second transformer T2 and a voltage limiting unit.
The primary winding of the second transformer T2 is connected in series with the secondary winding of the first transformer T1 (the secondary winding of the first transformer T1 is coupled with the primary winding of the first transformer T1). It should be noted that, compared with the scheme of directly adopting the resonant inductor L 'and the secondary winding of the first transformer T1 to be connected in series in the related art, in order to achieve single variable control of the pulse voltage VPLr of the resonant inductor L' in the related art, in the embodiment of the present application, the inductance of the primary winding of the second transformer T2 is selected to be equal to the inductance of the resonant inductor L 'in the related art, so that the primary winding of the second transformer T2 is used to replace the resonant inductor L', and the same effect is achieved.
The voltage limiting unit is connected with the secondary winding of the second transformer T2, and the voltage limiting unit can limit the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 to a preset voltage when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is greater than the preset threshold voltage. The "threshold voltage" is understood to be a minimum voltage value that can greatly interfere with surrounding circuits and reduce electromagnetic compatibility (EMC) performance of the energy storage inverter 2, and the specific value of the "threshold voltage" is not limited herein, so that a designer can reasonably design according to experimental data actually measured. The "preset voltage" is understood to mean a maximum voltage value that does not cause a great disturbance to the surrounding circuit and does not reduce the electromagnetic compatibility of the energy storage inverter power source 2.
Based on the voltage limiting isolation circuit 1 in the embodiment of the application, when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is larger than the threshold voltage, the voltage limiting unit can limit the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 to a preset voltage, and the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is controlled not to be too large, so that the interference to surrounding circuits is effectively reduced, and the electromagnetic compatibility of the energy storage inverter 2 is effectively improved.
Further, as shown in fig. 3, in some embodiments, the voltage limiting unit includes a first diode D1, a second diode D2, and a bleeder element; the cathode of the first diode D1 is connected with one end of a secondary winding of the second transformer T2; the cathode of the second diode D2 is connected with the other end of the secondary winding of the second transformer T2; the first end of the bleeder element is connected to the anode of the first diode D1 and the second end of the bleeder element is connected to the anode of the second diode D2. Specifically, the cathode of the first diode D1 is connected to the homonymous terminal of the secondary winding of the second transformer T2, and the cathode of the second diode D2 is connected to the homonymous terminal of the secondary winding of the second transformer T2.
When the peak value of the pulse voltage VPLr of the secondary winding of the second transformer T2 is greater than the threshold voltage, the voltage of the first diode D1 is limited by the transient voltage suppression diode so that the voltage does not exceed the specification requirement of the transient voltage suppression diode. The second diode D2 is a transient voltage suppression diode (TVS diode), and when the peak value of the pulse voltage VPLr of the secondary winding of the second transformer T2 is greater than the threshold voltage, the transient voltage suppression diode limits the voltage thereof so that the voltage does not exceed the specification requirement of the transient voltage suppression diode.
For the positive half period of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is equal to or less than the threshold voltage, the voltage of the smaller pulse voltage VPLr coupled to the secondary winding of the second transformer T2 does not reach the condition of breaking down the first diode D1, at this time, the first diode D1 is not broken down, no current is in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, and the smaller pulse voltage VPLr coupled to the secondary winding of the second transformer T2 cannot be consumed in the form of heat by the bleeder element. Similarly, for the positive half cycle of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is greater than the threshold voltage, the voltage on the secondary winding of the second transformer T2 coupled to the larger pulse voltage VPLr reaches the condition of breakdown of the first diode D1, at this time, the first diode D1 is broken down, and a larger current occurs in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, and the larger current passes through the bleeder element, so that the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 is rapidly consumed in the form of heat by the bleeder element to reduce the pulse voltage VPLr on the secondary winding of the second transformer T2, thereby reversely pulling down the positive pulse voltage VPLr on the primary winding of the second transformer T2.
It should be noted that, in the actual design, the designer needs to adjust the parameter of the first diode D1 according to the actual magnitude of the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 for the positive half period of the pulse voltage VPLr on the primary winding of the second transformer T2. For example, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is slightly larger than the above threshold voltage, only one first diode D1 may be used to connect the bleeder element to form a loop. For example, when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is far greater than the threshold voltage, a plurality of (two or more) identical first diodes D1 may be connected in parallel, and then the plurality of first diodes D1 connected in parallel may be connected to the bleeder element to form a loop.
For the negative half period of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is less than or equal to the threshold voltage, the voltage of the smaller pulse voltage VPLr coupled to the secondary winding of the second transformer T2 does not reach the condition of breaking down the second diode D2, at which time the second diode D2 is not broken down, and no current is in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, the smaller pulse voltage VPLr coupled to the secondary winding of the second transformer T2 cannot be dissipated as heat through the bleeder element. Similarly, for the negative half period of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is greater than the threshold voltage, the voltage on the secondary winding of the second transformer T2 coupled to the larger pulse voltage VPLr reaches the condition of breakdown of the second diode D2, at this time, the second diode D2 is broken down, and a larger current occurs in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, and the larger current passes through the bleeder element, so that the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 is rapidly consumed in the form of heat by the bleeder element to reduce the pulse voltage VPLr on the secondary winding of the second transformer T2, thereby reversely pulling down the pulse voltage VPLr on the negative half period of the primary winding of the second transformer T2.
It should be noted that, in the actual design, the designer needs to adjust the parameter of the second diode D2 according to the actual magnitude of the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 for the negative half period of the pulse voltage VPLr on the primary winding of the second transformer T2. For example, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is slightly greater than the above threshold voltage, only one second diode D2 may be used to connect the bleeder element in a loop. For example, when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is far greater than the threshold voltage, a plurality of (two or more) identical second diodes D2 may be connected in parallel, and then the plurality of second diodes D2 connected in parallel may be connected to the bleeder element to form a loop.
In summary, by providing the first diode D1 and the second diode D2 at both ends of the secondary winding of the second transformer T2, respectively, the bleeder element is able to quickly consume the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 in the form of heat, either for the positive half-period of the pulse voltage VPLr on the primary winding of the second transformer T2 or for the negative half-period of the pulse voltage VPLr on the primary winding of the second transformer T2, to reduce the pulse voltage VPLr on the secondary winding of the second transformer T2, thereby pulling down the pulse voltage VPLr on the primary winding of the second transformer T2 in turn.
Further, consider that the bleeder element is capable of rapidly dissipating the larger pulse voltage VPLr coupled on the secondary winding of the second transformer T2 in the form of heat, either for the positive half-cycle of the pulse voltage VPLr on the primary winding of the second transformer T2 or for the negative half-cycle of the pulse voltage VPLr on the primary winding of the second transformer T2, to lower the pulse voltage VPLr on the secondary winding of the second transformer T2, which in turn pulls down the pulse voltage VPLr on the primary winding of the second transformer T2. The embodiments with respect to the bleeder element may be, but are not limited to, the following.
In the first embodiment, as shown in fig. 3, the bleeder element is a resistor R, a first end of the resistor R is connected to the anode of the first diode D1, and a second end of the resistor R is connected to the anode of the second diode D2. For the positive half period of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is greater than the threshold voltage, the first diode D1 breaks down, and a larger current will occur in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, and this larger current flows through the resistor R, so that the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 is rapidly consumed in the form of heat through the resistor R, so as to reduce the pulse voltage VPLr on the secondary winding of the second transformer T2, and in turn pull down the pulse voltage VPLr of the positive half period on the primary winding of the second transformer T2. Similarly, for the negative half period of the pulse voltage VPLr on the primary winding of the second transformer T2, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is greater than the threshold voltage, the second diode D2 breaks down, and a larger current flows through the resistor R in the loop formed by the secondary winding of the second transformer T2 and the bleeder element, so that the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 is rapidly consumed in the form of heat through the resistor R, so as to reduce the pulse voltage VPLr on the secondary winding of the second transformer T2, and in turn pull down the pulse voltage VPLr of the negative half period on the primary winding of the second transformer T2.
As shown in fig. 4, in a second embodiment, the bleeder element comprises a resistor R and a first capacitor C1; the first end of the resistor R is connected with the anode of the first diode D1, and the second end of the resistor R is connected with the anode of the second diode D2; the first polar plate of the first capacitor C1 is connected to the first end of the resistor R, and the second polar plate of the first capacitor C1 is connected to the second end of the resistor R (i.e., the first capacitor C1 and the resistor R are connected in parallel between the anode of the first diode D1 and the anode of the second diode D2).
It should be noted that the resistor R is used to regulate the voltage limiting capability of the pulse voltage VPLr on the secondary winding of the second transformer T2. Since the breakdown voltage of the first diode D1 and the second diode D2 varies in a small range, it can be regarded as a fixed value. The designer needs to adjust the parameters of the resistor R according to the actual magnitude of the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2. For example, when the peak value of the pulse voltage VPLr on the primary winding of the second transformer T2 is slightly greater than the threshold voltage, only one resistor R may be used to connect the first diode D1 and the second diode D2 to form a loop. For another example, when the peak value of the pulse voltage VPLr of the primary winding of the second transformer T2 is far greater than the threshold voltage, a plurality of resistors R with the same/different resistances may be connected in series/parallel/mixed connection to form a resistor branch, and then the resistor branch is connected with the first diode D1 and the second diode D2 to form a loop. It will be appreciated that the smaller the total resistance of the resistor R in the resistor branch, the greater the dissipation of the pulse voltage VPLr on the secondary winding of the second transformer T2, and the lower the pulse voltage VPLr on the secondary winding of the second transformer T2, which in turn limits the pulse voltage VPLr on the primary winding of the second transformer T2 to a lower value, which is represented by a lower pulse voltage VPLr.
Further, as shown in fig. 3-4, in some embodiments, the isolation module 10 further includes a second capacitor C2, the second capacitor C2 being connected in series with the secondary winding of the first transformer T1. Specifically, the second capacitor C2 is connected to the same-name end of the secondary winding of the first transformer T1. By designing the second capacitor C2, the second capacitor C2 can effectively filter the alternating current output by the secondary winding of the first transformer T1.
As shown in fig. 6, fig. 6 is a schematic structural diagram of an energy storage inverter 2 according to an embodiment of the present application, as shown in fig. 6, a primary winding of a second transformer T2 is used to replace the resonant inductor L ', the inductance of the primary winding of the second transformer T2 is the same as that of the resonant inductor L', the ratio of the number of turns of the primary winding of the second transformer T2 to the number of turns of the secondary winding of the second transformer T2 may be 10:1 (according to the basic principle of the transformer, the voltage on the primary winding of the second transformer T2 is 0.1 times that on the secondary winding of the second transformer T2, so as to reduce the voltage stress on the circuit where the secondary winding of the second transformer T2 is located), and the first diode D1 and the second diode D2 may use a transient voltage suppression diode with 24 volts, and the resistance R may have a resistance value of 0.2 ohms. After improvement, the phenomenon shown in fig. 5 can be seen through simulation, and as can be seen from fig. 5, the resistor R can quickly consume the larger pulse voltage VPLr coupled to the secondary winding of the second transformer T2 in the form of heat, so that the peak value of the pulse voltage VPLr is reduced from 708 volts to 393 volts, the peak value of the pulse voltage VPLr is greatly reduced, and the effect is remarkable.
Referring to fig. 6 and 7, a second aspect of the present application proposes an energy storage inverter power source 2 (not shown in the drawings), the energy storage inverter power source 2 includes a circuit board, an energy storage module 30, a first DC/AC inverter 40 and the voltage limiting isolation circuit 1, the voltage limiting isolation circuit 1 is disposed on the circuit board, an input end of the first DC/AC inverter 40 is connected to an output end of the energy storage module 30, and an output end of the first DC/AC inverter 40 is connected to a primary winding of the first transformer T1. In the design, the energy storage inverter power supply 2 with the voltage limiting isolation circuit 1 has good electromagnetic compatibility.
Further, as shown in fig. 6-7, in some embodiments, the energy storage inverter 2 further includes an AC/DC rectifier 50, and an input terminal of the AC/DC rectifier 50 is connected to a homonymous terminal of the secondary winding of the first transformer T1 and a heteronymous terminal of the primary winding of the second transformer T2. In this design, by designing the AC/DC rectifier 50, the AC/DC rectifier 50 can convert the alternating current input from the first transformer T1 into direct current.
Further, as shown in fig. 6-7, in some embodiments, the energy storage inverter 2 further comprises a second DC/AC inverter 60, an input of the second DC/AC inverter 60 being connected to an output of the rectifier, the output of the second DC/AC inverter 60 being for accessing the external load 3. In this design, by designing the second DC/AC inverter 60, the second DC/AC inverter 60 can convert the direct current of the direct current bus connected to the AC/DC rectifier 50 into alternating current that meets the electricity demand of the external load 3, and the alternating current supplies power to the external load 3 through the AC output interface of the energy storage inverter 2.
It should be noted that the energy storage inverter 2 further includes an AC output interface, and an output end of the second DC/AC inverter 60 is connected to the AC output interface, and the AC output interface is used for accessing the external load 3. The number of the alternating current output interfaces can be one or a plurality of (more than two); when the number of the ac output interfaces is plural, the ac output interfaces may be all connected to the external load 3, and at this time, the energy storage module 30 of the energy storage inverter 2 may supply power to all the external loads 3 connected to the ac output interfaces at the same time; the energy storage module 30 of the energy storage inverter 2 may supply power to the external load 3 connected to a part of the ac output interfaces at the same time.
The discharging principle of the energy storage inverter 2 is described in the following with reference to fig. 6 to 7:
When the energy storage inverter 2 discharges, the energy storage inverter 2 supplies power to the external load 3 through the energy storage module 30 inside. The method comprises the following steps: the energy storage module 30 supplies the direct current to the first DC/AC inverter 40, and the first DC/AC inverter 40 converts the direct current into an alternating current and outputs the alternating current to the first transformer T1. The first transformer T1 transfers the input AC power to the AC/DC rectifier 50 after the isolation conversion (step-up or step-down). The AC/DC rectifier 50 converts the alternating current input from the first transformer T1 into direct current and transfers the direct current to the second DC/AC inverter 60 through a direct current bus. The second DC/AC inverter 60 converts the direct current of the direct current bus connected to the AC/DC rectifier 50 into alternating current according to the electricity demand of the external load 3, and the alternating current supplies power to the external load 3 through the alternating current output interface of the energy storage inverter 2.
A third aspect of the present application proposes a photovoltaic energy storage inverter system (not shown in the figure), which includes a photovoltaic module and the energy storage inverter power supply 2 described above, and the photovoltaic module is connected to the energy storage inverter power supply 2. In the design, the photovoltaic energy storage inversion system with the energy storage inversion power supply 2 has good electromagnetic compatibility; in addition, the user can correspondingly move and assemble the photovoltaic module, the energy storage inverter power supply 2 and the load 3 according to the actual application environment so as to meet the electricity consumption requirements of the user in different application scenes.
In the photovoltaic energy storage inverter system, the photovoltaic module, the energy storage inverter power supply 2 and the load 3 are independent components. The user can correspondingly assemble the photovoltaic module, the energy storage inverter 2 and the load 3 according to the practical application environment. For example, in a cloudy day application environment, a user may simply assemble the load 3 with the energy storage inverter 2 to achieve the power supply requirement of the energy storage inverter 2 to the load 3. For another example, in a sunny application environment, a user may only assemble the photovoltaic module with the energy storage inverter power source 2, so as to realize the power supply requirement of the photovoltaic module on the energy storage inverter power source 2.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (10)
1. The voltage limiting isolation circuit is characterized by being applied to an energy storage inversion power supply, wherein the energy storage inversion power supply comprises an energy storage module and a first DC/AC inverter, and the input end of the first DC/AC inverter is connected with the output end of the energy storage module; the voltage limiting isolation circuit includes:
the isolation module comprises a first transformer, and a primary winding of the first transformer is used for being connected with the output end of the first DC/AC inverter;
The voltage limiting module comprises a second transformer and a voltage limiting unit, wherein a primary winding of the second transformer is connected with a secondary winding of the first transformer in series, the secondary winding of the second transformer is connected with the voltage limiting unit, and the voltage limiting unit can limit the peak value of the pulse voltage of the primary winding of the second transformer to be at a preset voltage when the peak value of the pulse voltage of the primary winding of the second transformer is larger than a preset threshold voltage.
2. The voltage-limiting isolation circuit of claim 1, wherein the voltage-limiting unit comprises:
The cathode of the first diode is connected with one end of the secondary winding of the second transformer;
the cathode of the second diode is connected with the other end of the secondary winding of the second transformer;
And the first end of the bleeder element is connected with the anode of the first diode, and the second end of the bleeder element is connected with the anode of the second diode.
3. The voltage limiting isolation circuit of claim 2 wherein,
The bleeder element is a resistor, a first end of the resistor is connected with the anode of the first diode, and a second end of the resistor is connected with the anode of the second diode.
4. The voltage limiting isolation circuit of claim 2 wherein said bleed element comprises:
The first end of the resistor is connected with the anode of the first diode, and the second end of the resistor is connected with the anode of the second diode;
The first polar plate of the first capacitor is connected with the first end of the resistor, and the second polar plate of the first capacitor is connected with the second end of the resistor.
5. The voltage limiting isolation circuit of claim 2 wherein,
The cathode of the first diode is connected with the homonymous end of the secondary winding of the second transformer, and the cathode of the second diode is connected with the heteronymous end of the secondary winding of the second transformer.
6. The voltage limiting isolation circuit of any of claims 1-5, wherein said isolation module further comprises:
And the second capacitor is connected with the secondary winding of the first transformer in series.
7. An energy storage inverter power supply, comprising:
A circuit board;
the voltage limiting isolation circuit of any of claims 1-6, the voltage limiting isolation circuit being disposed on the circuit board;
An energy storage module; and
The input end of the first DC/AC inverter is connected with the output end of the energy storage module, and the output end of the first DC/AC inverter is connected with the primary winding of the first transformer.
8. The energy storage inverter power supply of claim 7 further comprising:
And the input end of the AC/DC rectifier is connected with the homonymous end of the secondary winding of the first transformer and the heteronymous end of the primary winding of the second transformer.
9. The energy storage inverter power supply of claim 8 further comprising:
And the input end of the second DC/AC inverter is connected with the output end of the AC/DC rectifier, and the output end of the second DC/AC inverter is used for being connected with an external load.
10. An energy storage inverter system, comprising:
The energy storage inverter power supply of any one of claims 7-9; and
And the photovoltaic module is connected with the energy storage inverter power supply.
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| CN202323107004.3U CN221467563U (en) | 2023-11-16 | 2023-11-16 | Voltage limiting isolation circuit, energy storage inversion power supply and energy storage inversion system |
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| CN202323107004.3U CN221467563U (en) | 2023-11-16 | 2023-11-16 | Voltage limiting isolation circuit, energy storage inversion power supply and energy storage inversion system |
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